1 /*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 #include <linux/mm.h>
39 #include <linux/delay.h>
40 #include <linux/errno.h>
41 #include <linux/string.h>
42 #include <linux/ratelimit.h>
43 #include <linux/printk.h>
44 #include <linux/slab.h>
45 #include <linux/sunrpc/clnt.h>
46 #include <linux/nfs.h>
47 #include <linux/nfs4.h>
48 #include <linux/nfs_fs.h>
49 #include <linux/nfs_page.h>
50 #include <linux/nfs_mount.h>
51 #include <linux/namei.h>
52 #include <linux/mount.h>
53 #include <linux/module.h>
54 #include <linux/xattr.h>
55 #include <linux/utsname.h>
56 #include <linux/freezer.h>
57 #include <linux/iversion.h>
58
59 #include "nfs4_fs.h"
60 #include "delegation.h"
61 #include "internal.h"
62 #include "iostat.h"
63 #include "callback.h"
64 #include "pnfs.h"
65 #include "netns.h"
66 #include "sysfs.h"
67 #include "nfs4idmap.h"
68 #include "nfs4session.h"
69 #include "fscache.h"
70 #include "nfs42.h"
71
72 #include "nfs4trace.h"
73
74 #define NFSDBG_FACILITY NFSDBG_PROC
75
76 #define NFS4_BITMASK_SZ 3
77
78 #define NFS4_POLL_RETRY_MIN (HZ/10)
79 #define NFS4_POLL_RETRY_MAX (15*HZ)
80
81 /* file attributes which can be mapped to nfs attributes */
82 #define NFS4_VALID_ATTRS (ATTR_MODE \
83 | ATTR_UID \
84 | ATTR_GID \
85 | ATTR_SIZE \
86 | ATTR_ATIME \
87 | ATTR_MTIME \
88 | ATTR_CTIME \
89 | ATTR_ATIME_SET \
90 | ATTR_MTIME_SET)
91
92 struct nfs4_opendata;
93 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
94 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
95 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
96 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
97 struct nfs_fattr *fattr, struct inode *inode);
98 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
99 struct nfs_fattr *fattr, struct iattr *sattr,
100 struct nfs_open_context *ctx, struct nfs4_label *ilabel);
101 #ifdef CONFIG_NFS_V4_1
102 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
103 const struct cred *cred,
104 struct nfs4_slot *slot,
105 bool is_privileged);
106 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
107 const struct cred *);
108 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
109 const struct cred *, bool);
110 #endif
111
112 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
113 static inline struct nfs4_label *
nfs4_label_init_security(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label)114 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
115 struct iattr *sattr, struct nfs4_label *label)
116 {
117 int err;
118
119 if (label == NULL)
120 return NULL;
121
122 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
123 return NULL;
124
125 label->lfs = 0;
126 label->pi = 0;
127 label->len = 0;
128 label->label = NULL;
129
130 err = security_dentry_init_security(dentry, sattr->ia_mode,
131 &dentry->d_name, NULL,
132 (void **)&label->label, &label->len);
133 if (err == 0)
134 return label;
135
136 return NULL;
137 }
138 static inline void
nfs4_label_release_security(struct nfs4_label * label)139 nfs4_label_release_security(struct nfs4_label *label)
140 {
141 if (label)
142 security_release_secctx(label->label, label->len);
143 }
nfs4_bitmask(struct nfs_server * server,struct nfs4_label * label)144 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
145 {
146 if (label)
147 return server->attr_bitmask;
148
149 return server->attr_bitmask_nl;
150 }
151 #else
152 static inline struct nfs4_label *
nfs4_label_init_security(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * l)153 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
154 struct iattr *sattr, struct nfs4_label *l)
155 { return NULL; }
156 static inline void
nfs4_label_release_security(struct nfs4_label * label)157 nfs4_label_release_security(struct nfs4_label *label)
158 { return; }
159 static inline u32 *
nfs4_bitmask(struct nfs_server * server,struct nfs4_label * label)160 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
161 { return server->attr_bitmask; }
162 #endif
163
164 /* Prevent leaks of NFSv4 errors into userland */
nfs4_map_errors(int err)165 static int nfs4_map_errors(int err)
166 {
167 if (err >= -1000)
168 return err;
169 switch (err) {
170 case -NFS4ERR_RESOURCE:
171 case -NFS4ERR_LAYOUTTRYLATER:
172 case -NFS4ERR_RECALLCONFLICT:
173 case -NFS4ERR_RETURNCONFLICT:
174 return -EREMOTEIO;
175 case -NFS4ERR_WRONGSEC:
176 case -NFS4ERR_WRONG_CRED:
177 return -EPERM;
178 case -NFS4ERR_BADOWNER:
179 case -NFS4ERR_BADNAME:
180 return -EINVAL;
181 case -NFS4ERR_SHARE_DENIED:
182 return -EACCES;
183 case -NFS4ERR_MINOR_VERS_MISMATCH:
184 return -EPROTONOSUPPORT;
185 case -NFS4ERR_FILE_OPEN:
186 return -EBUSY;
187 case -NFS4ERR_NOT_SAME:
188 return -ENOTSYNC;
189 default:
190 dprintk("%s could not handle NFSv4 error %d\n",
191 __func__, -err);
192 break;
193 }
194 return -EIO;
195 }
196
197 /*
198 * This is our standard bitmap for GETATTR requests.
199 */
200 const u32 nfs4_fattr_bitmap[3] = {
201 FATTR4_WORD0_TYPE
202 | FATTR4_WORD0_CHANGE
203 | FATTR4_WORD0_SIZE
204 | FATTR4_WORD0_FSID
205 | FATTR4_WORD0_FILEID,
206 FATTR4_WORD1_MODE
207 | FATTR4_WORD1_NUMLINKS
208 | FATTR4_WORD1_OWNER
209 | FATTR4_WORD1_OWNER_GROUP
210 | FATTR4_WORD1_RAWDEV
211 | FATTR4_WORD1_SPACE_USED
212 | FATTR4_WORD1_TIME_ACCESS
213 | FATTR4_WORD1_TIME_METADATA
214 | FATTR4_WORD1_TIME_MODIFY
215 | FATTR4_WORD1_MOUNTED_ON_FILEID,
216 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
217 FATTR4_WORD2_SECURITY_LABEL
218 #endif
219 };
220
221 static const u32 nfs4_pnfs_open_bitmap[3] = {
222 FATTR4_WORD0_TYPE
223 | FATTR4_WORD0_CHANGE
224 | FATTR4_WORD0_SIZE
225 | FATTR4_WORD0_FSID
226 | FATTR4_WORD0_FILEID,
227 FATTR4_WORD1_MODE
228 | FATTR4_WORD1_NUMLINKS
229 | FATTR4_WORD1_OWNER
230 | FATTR4_WORD1_OWNER_GROUP
231 | FATTR4_WORD1_RAWDEV
232 | FATTR4_WORD1_SPACE_USED
233 | FATTR4_WORD1_TIME_ACCESS
234 | FATTR4_WORD1_TIME_METADATA
235 | FATTR4_WORD1_TIME_MODIFY,
236 FATTR4_WORD2_MDSTHRESHOLD
237 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
238 | FATTR4_WORD2_SECURITY_LABEL
239 #endif
240 };
241
242 static const u32 nfs4_open_noattr_bitmap[3] = {
243 FATTR4_WORD0_TYPE
244 | FATTR4_WORD0_FILEID,
245 };
246
247 const u32 nfs4_statfs_bitmap[3] = {
248 FATTR4_WORD0_FILES_AVAIL
249 | FATTR4_WORD0_FILES_FREE
250 | FATTR4_WORD0_FILES_TOTAL,
251 FATTR4_WORD1_SPACE_AVAIL
252 | FATTR4_WORD1_SPACE_FREE
253 | FATTR4_WORD1_SPACE_TOTAL
254 };
255
256 const u32 nfs4_pathconf_bitmap[3] = {
257 FATTR4_WORD0_MAXLINK
258 | FATTR4_WORD0_MAXNAME,
259 0
260 };
261
262 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
263 | FATTR4_WORD0_MAXREAD
264 | FATTR4_WORD0_MAXWRITE
265 | FATTR4_WORD0_LEASE_TIME,
266 FATTR4_WORD1_TIME_DELTA
267 | FATTR4_WORD1_FS_LAYOUT_TYPES,
268 FATTR4_WORD2_LAYOUT_BLKSIZE
269 | FATTR4_WORD2_CLONE_BLKSIZE
270 | FATTR4_WORD2_CHANGE_ATTR_TYPE
271 | FATTR4_WORD2_XATTR_SUPPORT
272 };
273
274 const u32 nfs4_fs_locations_bitmap[3] = {
275 FATTR4_WORD0_CHANGE
276 | FATTR4_WORD0_SIZE
277 | FATTR4_WORD0_FSID
278 | FATTR4_WORD0_FILEID
279 | FATTR4_WORD0_FS_LOCATIONS,
280 FATTR4_WORD1_OWNER
281 | FATTR4_WORD1_OWNER_GROUP
282 | FATTR4_WORD1_RAWDEV
283 | FATTR4_WORD1_SPACE_USED
284 | FATTR4_WORD1_TIME_ACCESS
285 | FATTR4_WORD1_TIME_METADATA
286 | FATTR4_WORD1_TIME_MODIFY
287 | FATTR4_WORD1_MOUNTED_ON_FILEID,
288 };
289
nfs4_bitmap_copy_adjust(__u32 * dst,const __u32 * src,struct inode * inode,unsigned long flags)290 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
291 struct inode *inode, unsigned long flags)
292 {
293 unsigned long cache_validity;
294
295 memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
296 if (!inode || !nfs4_have_delegation(inode, FMODE_READ))
297 return;
298
299 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags;
300
301 /* Remove the attributes over which we have full control */
302 dst[1] &= ~FATTR4_WORD1_RAWDEV;
303 if (!(cache_validity & NFS_INO_INVALID_SIZE))
304 dst[0] &= ~FATTR4_WORD0_SIZE;
305
306 if (!(cache_validity & NFS_INO_INVALID_CHANGE))
307 dst[0] &= ~FATTR4_WORD0_CHANGE;
308
309 if (!(cache_validity & NFS_INO_INVALID_MODE))
310 dst[1] &= ~FATTR4_WORD1_MODE;
311 if (!(cache_validity & NFS_INO_INVALID_OTHER))
312 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP);
313 }
314
nfs4_setup_readdir(u64 cookie,__be32 * verifier,struct dentry * dentry,struct nfs4_readdir_arg * readdir)315 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
316 struct nfs4_readdir_arg *readdir)
317 {
318 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
319 __be32 *start, *p;
320
321 if (cookie > 2) {
322 readdir->cookie = cookie;
323 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
324 return;
325 }
326
327 readdir->cookie = 0;
328 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
329 if (cookie == 2)
330 return;
331
332 /*
333 * NFSv4 servers do not return entries for '.' and '..'
334 * Therefore, we fake these entries here. We let '.'
335 * have cookie 0 and '..' have cookie 1. Note that
336 * when talking to the server, we always send cookie 0
337 * instead of 1 or 2.
338 */
339 start = p = kmap_atomic(*readdir->pages);
340
341 if (cookie == 0) {
342 *p++ = xdr_one; /* next */
343 *p++ = xdr_zero; /* cookie, first word */
344 *p++ = xdr_one; /* cookie, second word */
345 *p++ = xdr_one; /* entry len */
346 memcpy(p, ".\0\0\0", 4); /* entry */
347 p++;
348 *p++ = xdr_one; /* bitmap length */
349 *p++ = htonl(attrs); /* bitmap */
350 *p++ = htonl(12); /* attribute buffer length */
351 *p++ = htonl(NF4DIR);
352 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
353 }
354
355 *p++ = xdr_one; /* next */
356 *p++ = xdr_zero; /* cookie, first word */
357 *p++ = xdr_two; /* cookie, second word */
358 *p++ = xdr_two; /* entry len */
359 memcpy(p, "..\0\0", 4); /* entry */
360 p++;
361 *p++ = xdr_one; /* bitmap length */
362 *p++ = htonl(attrs); /* bitmap */
363 *p++ = htonl(12); /* attribute buffer length */
364 *p++ = htonl(NF4DIR);
365 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
366
367 readdir->pgbase = (char *)p - (char *)start;
368 readdir->count -= readdir->pgbase;
369 kunmap_atomic(start);
370 }
371
nfs4_fattr_set_prechange(struct nfs_fattr * fattr,u64 version)372 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version)
373 {
374 if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) {
375 fattr->pre_change_attr = version;
376 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
377 }
378 }
379
nfs4_test_and_free_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)380 static void nfs4_test_and_free_stateid(struct nfs_server *server,
381 nfs4_stateid *stateid,
382 const struct cred *cred)
383 {
384 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
385
386 ops->test_and_free_expired(server, stateid, cred);
387 }
388
__nfs4_free_revoked_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)389 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
390 nfs4_stateid *stateid,
391 const struct cred *cred)
392 {
393 stateid->type = NFS4_REVOKED_STATEID_TYPE;
394 nfs4_test_and_free_stateid(server, stateid, cred);
395 }
396
nfs4_free_revoked_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)397 static void nfs4_free_revoked_stateid(struct nfs_server *server,
398 const nfs4_stateid *stateid,
399 const struct cred *cred)
400 {
401 nfs4_stateid tmp;
402
403 nfs4_stateid_copy(&tmp, stateid);
404 __nfs4_free_revoked_stateid(server, &tmp, cred);
405 }
406
nfs4_update_delay(long * timeout)407 static long nfs4_update_delay(long *timeout)
408 {
409 long ret;
410 if (!timeout)
411 return NFS4_POLL_RETRY_MAX;
412 if (*timeout <= 0)
413 *timeout = NFS4_POLL_RETRY_MIN;
414 if (*timeout > NFS4_POLL_RETRY_MAX)
415 *timeout = NFS4_POLL_RETRY_MAX;
416 ret = *timeout;
417 *timeout <<= 1;
418 return ret;
419 }
420
nfs4_delay_killable(long * timeout)421 static int nfs4_delay_killable(long *timeout)
422 {
423 might_sleep();
424
425 __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
426 schedule_timeout(nfs4_update_delay(timeout));
427 if (!__fatal_signal_pending(current))
428 return 0;
429 return -EINTR;
430 }
431
nfs4_delay_interruptible(long * timeout)432 static int nfs4_delay_interruptible(long *timeout)
433 {
434 might_sleep();
435
436 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE);
437 schedule_timeout(nfs4_update_delay(timeout));
438 if (!signal_pending(current))
439 return 0;
440 return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
441 }
442
nfs4_delay(long * timeout,bool interruptible)443 static int nfs4_delay(long *timeout, bool interruptible)
444 {
445 if (interruptible)
446 return nfs4_delay_interruptible(timeout);
447 return nfs4_delay_killable(timeout);
448 }
449
450 static const nfs4_stateid *
nfs4_recoverable_stateid(const nfs4_stateid * stateid)451 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
452 {
453 if (!stateid)
454 return NULL;
455 switch (stateid->type) {
456 case NFS4_OPEN_STATEID_TYPE:
457 case NFS4_LOCK_STATEID_TYPE:
458 case NFS4_DELEGATION_STATEID_TYPE:
459 return stateid;
460 default:
461 break;
462 }
463 return NULL;
464 }
465
466 /* This is the error handling routine for processes that are allowed
467 * to sleep.
468 */
nfs4_do_handle_exception(struct nfs_server * server,int errorcode,struct nfs4_exception * exception)469 static int nfs4_do_handle_exception(struct nfs_server *server,
470 int errorcode, struct nfs4_exception *exception)
471 {
472 struct nfs_client *clp = server->nfs_client;
473 struct nfs4_state *state = exception->state;
474 const nfs4_stateid *stateid;
475 struct inode *inode = exception->inode;
476 int ret = errorcode;
477
478 exception->delay = 0;
479 exception->recovering = 0;
480 exception->retry = 0;
481
482 stateid = nfs4_recoverable_stateid(exception->stateid);
483 if (stateid == NULL && state != NULL)
484 stateid = nfs4_recoverable_stateid(&state->stateid);
485
486 switch(errorcode) {
487 case 0:
488 return 0;
489 case -NFS4ERR_BADHANDLE:
490 case -ESTALE:
491 if (inode != NULL && S_ISREG(inode->i_mode))
492 pnfs_destroy_layout(NFS_I(inode));
493 break;
494 case -NFS4ERR_DELEG_REVOKED:
495 case -NFS4ERR_ADMIN_REVOKED:
496 case -NFS4ERR_EXPIRED:
497 case -NFS4ERR_BAD_STATEID:
498 case -NFS4ERR_PARTNER_NO_AUTH:
499 if (inode != NULL && stateid != NULL) {
500 nfs_inode_find_state_and_recover(inode,
501 stateid);
502 goto wait_on_recovery;
503 }
504 fallthrough;
505 case -NFS4ERR_OPENMODE:
506 if (inode) {
507 int err;
508
509 err = nfs_async_inode_return_delegation(inode,
510 stateid);
511 if (err == 0)
512 goto wait_on_recovery;
513 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
514 exception->retry = 1;
515 break;
516 }
517 }
518 if (state == NULL)
519 break;
520 ret = nfs4_schedule_stateid_recovery(server, state);
521 if (ret < 0)
522 break;
523 goto wait_on_recovery;
524 case -NFS4ERR_STALE_STATEID:
525 case -NFS4ERR_STALE_CLIENTID:
526 nfs4_schedule_lease_recovery(clp);
527 goto wait_on_recovery;
528 case -NFS4ERR_MOVED:
529 ret = nfs4_schedule_migration_recovery(server);
530 if (ret < 0)
531 break;
532 goto wait_on_recovery;
533 case -NFS4ERR_LEASE_MOVED:
534 nfs4_schedule_lease_moved_recovery(clp);
535 goto wait_on_recovery;
536 #if defined(CONFIG_NFS_V4_1)
537 case -NFS4ERR_BADSESSION:
538 case -NFS4ERR_BADSLOT:
539 case -NFS4ERR_BAD_HIGH_SLOT:
540 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
541 case -NFS4ERR_DEADSESSION:
542 case -NFS4ERR_SEQ_FALSE_RETRY:
543 case -NFS4ERR_SEQ_MISORDERED:
544 /* Handled in nfs41_sequence_process() */
545 goto wait_on_recovery;
546 #endif /* defined(CONFIG_NFS_V4_1) */
547 case -NFS4ERR_FILE_OPEN:
548 if (exception->timeout > HZ) {
549 /* We have retried a decent amount, time to
550 * fail
551 */
552 ret = -EBUSY;
553 break;
554 }
555 fallthrough;
556 case -NFS4ERR_DELAY:
557 nfs_inc_server_stats(server, NFSIOS_DELAY);
558 fallthrough;
559 case -NFS4ERR_GRACE:
560 case -NFS4ERR_LAYOUTTRYLATER:
561 case -NFS4ERR_RECALLCONFLICT:
562 case -NFS4ERR_RETURNCONFLICT:
563 exception->delay = 1;
564 return 0;
565
566 case -NFS4ERR_RETRY_UNCACHED_REP:
567 case -NFS4ERR_OLD_STATEID:
568 exception->retry = 1;
569 break;
570 case -NFS4ERR_BADOWNER:
571 /* The following works around a Linux server bug! */
572 case -NFS4ERR_BADNAME:
573 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
574 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
575 exception->retry = 1;
576 printk(KERN_WARNING "NFS: v4 server %s "
577 "does not accept raw "
578 "uid/gids. "
579 "Reenabling the idmapper.\n",
580 server->nfs_client->cl_hostname);
581 }
582 }
583 /* We failed to handle the error */
584 return nfs4_map_errors(ret);
585 wait_on_recovery:
586 exception->recovering = 1;
587 return 0;
588 }
589
590 /* This is the error handling routine for processes that are allowed
591 * to sleep.
592 */
nfs4_handle_exception(struct nfs_server * server,int errorcode,struct nfs4_exception * exception)593 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
594 {
595 struct nfs_client *clp = server->nfs_client;
596 int ret;
597
598 ret = nfs4_do_handle_exception(server, errorcode, exception);
599 if (exception->delay) {
600 ret = nfs4_delay(&exception->timeout,
601 exception->interruptible);
602 goto out_retry;
603 }
604 if (exception->recovering) {
605 if (exception->task_is_privileged)
606 return -EDEADLOCK;
607 ret = nfs4_wait_clnt_recover(clp);
608 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
609 return -EIO;
610 goto out_retry;
611 }
612 return ret;
613 out_retry:
614 if (ret == 0)
615 exception->retry = 1;
616 return ret;
617 }
618
619 static int
nfs4_async_handle_exception(struct rpc_task * task,struct nfs_server * server,int errorcode,struct nfs4_exception * exception)620 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
621 int errorcode, struct nfs4_exception *exception)
622 {
623 struct nfs_client *clp = server->nfs_client;
624 int ret;
625
626 ret = nfs4_do_handle_exception(server, errorcode, exception);
627 if (exception->delay) {
628 rpc_delay(task, nfs4_update_delay(&exception->timeout));
629 goto out_retry;
630 }
631 if (exception->recovering) {
632 if (exception->task_is_privileged)
633 return -EDEADLOCK;
634 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
635 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
636 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
637 goto out_retry;
638 }
639 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
640 ret = -EIO;
641 return ret;
642 out_retry:
643 if (ret == 0) {
644 exception->retry = 1;
645 /*
646 * For NFS4ERR_MOVED, the client transport will need to
647 * be recomputed after migration recovery has completed.
648 */
649 if (errorcode == -NFS4ERR_MOVED)
650 rpc_task_release_transport(task);
651 }
652 return ret;
653 }
654
655 int
nfs4_async_handle_error(struct rpc_task * task,struct nfs_server * server,struct nfs4_state * state,long * timeout)656 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
657 struct nfs4_state *state, long *timeout)
658 {
659 struct nfs4_exception exception = {
660 .state = state,
661 };
662
663 if (task->tk_status >= 0)
664 return 0;
665 if (timeout)
666 exception.timeout = *timeout;
667 task->tk_status = nfs4_async_handle_exception(task, server,
668 task->tk_status,
669 &exception);
670 if (exception.delay && timeout)
671 *timeout = exception.timeout;
672 if (exception.retry)
673 return -EAGAIN;
674 return 0;
675 }
676
677 /*
678 * Return 'true' if 'clp' is using an rpc_client that is integrity protected
679 * or 'false' otherwise.
680 */
_nfs4_is_integrity_protected(struct nfs_client * clp)681 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
682 {
683 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
684 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
685 }
686
do_renew_lease(struct nfs_client * clp,unsigned long timestamp)687 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
688 {
689 spin_lock(&clp->cl_lock);
690 if (time_before(clp->cl_last_renewal,timestamp))
691 clp->cl_last_renewal = timestamp;
692 spin_unlock(&clp->cl_lock);
693 }
694
renew_lease(const struct nfs_server * server,unsigned long timestamp)695 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
696 {
697 struct nfs_client *clp = server->nfs_client;
698
699 if (!nfs4_has_session(clp))
700 do_renew_lease(clp, timestamp);
701 }
702
703 struct nfs4_call_sync_data {
704 const struct nfs_server *seq_server;
705 struct nfs4_sequence_args *seq_args;
706 struct nfs4_sequence_res *seq_res;
707 };
708
nfs4_init_sequence(struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,int cache_reply,int privileged)709 void nfs4_init_sequence(struct nfs4_sequence_args *args,
710 struct nfs4_sequence_res *res, int cache_reply,
711 int privileged)
712 {
713 args->sa_slot = NULL;
714 args->sa_cache_this = cache_reply;
715 args->sa_privileged = privileged;
716
717 res->sr_slot = NULL;
718 }
719
nfs40_sequence_free_slot(struct nfs4_sequence_res * res)720 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
721 {
722 struct nfs4_slot *slot = res->sr_slot;
723 struct nfs4_slot_table *tbl;
724
725 tbl = slot->table;
726 spin_lock(&tbl->slot_tbl_lock);
727 if (!nfs41_wake_and_assign_slot(tbl, slot))
728 nfs4_free_slot(tbl, slot);
729 spin_unlock(&tbl->slot_tbl_lock);
730
731 res->sr_slot = NULL;
732 }
733
nfs40_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)734 static int nfs40_sequence_done(struct rpc_task *task,
735 struct nfs4_sequence_res *res)
736 {
737 if (res->sr_slot != NULL)
738 nfs40_sequence_free_slot(res);
739 return 1;
740 }
741
742 #if defined(CONFIG_NFS_V4_1)
743
nfs41_release_slot(struct nfs4_slot * slot)744 static void nfs41_release_slot(struct nfs4_slot *slot)
745 {
746 struct nfs4_session *session;
747 struct nfs4_slot_table *tbl;
748 bool send_new_highest_used_slotid = false;
749
750 if (!slot)
751 return;
752 tbl = slot->table;
753 session = tbl->session;
754
755 /* Bump the slot sequence number */
756 if (slot->seq_done)
757 slot->seq_nr++;
758 slot->seq_done = 0;
759
760 spin_lock(&tbl->slot_tbl_lock);
761 /* Be nice to the server: try to ensure that the last transmitted
762 * value for highest_user_slotid <= target_highest_slotid
763 */
764 if (tbl->highest_used_slotid > tbl->target_highest_slotid)
765 send_new_highest_used_slotid = true;
766
767 if (nfs41_wake_and_assign_slot(tbl, slot)) {
768 send_new_highest_used_slotid = false;
769 goto out_unlock;
770 }
771 nfs4_free_slot(tbl, slot);
772
773 if (tbl->highest_used_slotid != NFS4_NO_SLOT)
774 send_new_highest_used_slotid = false;
775 out_unlock:
776 spin_unlock(&tbl->slot_tbl_lock);
777 if (send_new_highest_used_slotid)
778 nfs41_notify_server(session->clp);
779 if (waitqueue_active(&tbl->slot_waitq))
780 wake_up_all(&tbl->slot_waitq);
781 }
782
nfs41_sequence_free_slot(struct nfs4_sequence_res * res)783 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
784 {
785 nfs41_release_slot(res->sr_slot);
786 res->sr_slot = NULL;
787 }
788
nfs4_slot_sequence_record_sent(struct nfs4_slot * slot,u32 seqnr)789 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
790 u32 seqnr)
791 {
792 if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
793 slot->seq_nr_highest_sent = seqnr;
794 }
nfs4_slot_sequence_acked(struct nfs4_slot * slot,u32 seqnr)795 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr)
796 {
797 nfs4_slot_sequence_record_sent(slot, seqnr);
798 slot->seq_nr_last_acked = seqnr;
799 }
800
nfs4_probe_sequence(struct nfs_client * client,const struct cred * cred,struct nfs4_slot * slot)801 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
802 struct nfs4_slot *slot)
803 {
804 struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
805 if (!IS_ERR(task))
806 rpc_put_task_async(task);
807 }
808
nfs41_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)809 static int nfs41_sequence_process(struct rpc_task *task,
810 struct nfs4_sequence_res *res)
811 {
812 struct nfs4_session *session;
813 struct nfs4_slot *slot = res->sr_slot;
814 struct nfs_client *clp;
815 int status;
816 int ret = 1;
817
818 if (slot == NULL)
819 goto out_noaction;
820 /* don't increment the sequence number if the task wasn't sent */
821 if (!RPC_WAS_SENT(task) || slot->seq_done)
822 goto out;
823
824 session = slot->table->session;
825 clp = session->clp;
826
827 trace_nfs4_sequence_done(session, res);
828
829 status = res->sr_status;
830 if (task->tk_status == -NFS4ERR_DEADSESSION)
831 status = -NFS4ERR_DEADSESSION;
832
833 /* Check the SEQUENCE operation status */
834 switch (status) {
835 case 0:
836 /* Mark this sequence number as having been acked */
837 nfs4_slot_sequence_acked(slot, slot->seq_nr);
838 /* Update the slot's sequence and clientid lease timer */
839 slot->seq_done = 1;
840 do_renew_lease(clp, res->sr_timestamp);
841 /* Check sequence flags */
842 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
843 !!slot->privileged);
844 nfs41_update_target_slotid(slot->table, slot, res);
845 break;
846 case 1:
847 /*
848 * sr_status remains 1 if an RPC level error occurred.
849 * The server may or may not have processed the sequence
850 * operation..
851 */
852 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
853 slot->seq_done = 1;
854 goto out;
855 case -NFS4ERR_DELAY:
856 /* The server detected a resend of the RPC call and
857 * returned NFS4ERR_DELAY as per Section 2.10.6.2
858 * of RFC5661.
859 */
860 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
861 __func__,
862 slot->slot_nr,
863 slot->seq_nr);
864 goto out_retry;
865 case -NFS4ERR_RETRY_UNCACHED_REP:
866 case -NFS4ERR_SEQ_FALSE_RETRY:
867 /*
868 * The server thinks we tried to replay a request.
869 * Retry the call after bumping the sequence ID.
870 */
871 nfs4_slot_sequence_acked(slot, slot->seq_nr);
872 goto retry_new_seq;
873 case -NFS4ERR_BADSLOT:
874 /*
875 * The slot id we used was probably retired. Try again
876 * using a different slot id.
877 */
878 if (slot->slot_nr < slot->table->target_highest_slotid)
879 goto session_recover;
880 goto retry_nowait;
881 case -NFS4ERR_SEQ_MISORDERED:
882 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
883 /*
884 * Were one or more calls using this slot interrupted?
885 * If the server never received the request, then our
886 * transmitted slot sequence number may be too high. However,
887 * if the server did receive the request then it might
888 * accidentally give us a reply with a mismatched operation.
889 * We can sort this out by sending a lone sequence operation
890 * to the server on the same slot.
891 */
892 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
893 slot->seq_nr--;
894 if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
895 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
896 res->sr_slot = NULL;
897 }
898 goto retry_nowait;
899 }
900 /*
901 * RFC5661:
902 * A retry might be sent while the original request is
903 * still in progress on the replier. The replier SHOULD
904 * deal with the issue by returning NFS4ERR_DELAY as the
905 * reply to SEQUENCE or CB_SEQUENCE operation, but
906 * implementations MAY return NFS4ERR_SEQ_MISORDERED.
907 *
908 * Restart the search after a delay.
909 */
910 slot->seq_nr = slot->seq_nr_highest_sent;
911 goto out_retry;
912 case -NFS4ERR_BADSESSION:
913 case -NFS4ERR_DEADSESSION:
914 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
915 goto session_recover;
916 default:
917 /* Just update the slot sequence no. */
918 slot->seq_done = 1;
919 }
920 out:
921 /* The session may be reset by one of the error handlers. */
922 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
923 out_noaction:
924 return ret;
925 session_recover:
926 set_bit(NFS4_SLOT_TBL_DRAINING, &session->fc_slot_table.slot_tbl_state);
927 nfs4_schedule_session_recovery(session, status);
928 dprintk("%s ERROR: %d Reset session\n", __func__, status);
929 nfs41_sequence_free_slot(res);
930 goto out;
931 retry_new_seq:
932 ++slot->seq_nr;
933 retry_nowait:
934 if (rpc_restart_call_prepare(task)) {
935 nfs41_sequence_free_slot(res);
936 task->tk_status = 0;
937 ret = 0;
938 }
939 goto out;
940 out_retry:
941 if (!rpc_restart_call(task))
942 goto out;
943 rpc_delay(task, NFS4_POLL_RETRY_MAX);
944 return 0;
945 }
946
nfs41_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)947 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
948 {
949 if (!nfs41_sequence_process(task, res))
950 return 0;
951 if (res->sr_slot != NULL)
952 nfs41_sequence_free_slot(res);
953 return 1;
954
955 }
956 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
957
nfs4_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)958 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
959 {
960 if (res->sr_slot == NULL)
961 return 1;
962 if (res->sr_slot->table->session != NULL)
963 return nfs41_sequence_process(task, res);
964 return nfs40_sequence_done(task, res);
965 }
966
nfs4_sequence_free_slot(struct nfs4_sequence_res * res)967 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
968 {
969 if (res->sr_slot != NULL) {
970 if (res->sr_slot->table->session != NULL)
971 nfs41_sequence_free_slot(res);
972 else
973 nfs40_sequence_free_slot(res);
974 }
975 }
976
nfs4_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)977 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
978 {
979 if (res->sr_slot == NULL)
980 return 1;
981 if (!res->sr_slot->table->session)
982 return nfs40_sequence_done(task, res);
983 return nfs41_sequence_done(task, res);
984 }
985 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
986
nfs41_call_sync_prepare(struct rpc_task * task,void * calldata)987 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
988 {
989 struct nfs4_call_sync_data *data = calldata;
990
991 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
992
993 nfs4_setup_sequence(data->seq_server->nfs_client,
994 data->seq_args, data->seq_res, task);
995 }
996
nfs41_call_sync_done(struct rpc_task * task,void * calldata)997 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
998 {
999 struct nfs4_call_sync_data *data = calldata;
1000
1001 nfs41_sequence_done(task, data->seq_res);
1002 }
1003
1004 static const struct rpc_call_ops nfs41_call_sync_ops = {
1005 .rpc_call_prepare = nfs41_call_sync_prepare,
1006 .rpc_call_done = nfs41_call_sync_done,
1007 };
1008
1009 #else /* !CONFIG_NFS_V4_1 */
1010
nfs4_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)1011 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
1012 {
1013 return nfs40_sequence_done(task, res);
1014 }
1015
nfs4_sequence_free_slot(struct nfs4_sequence_res * res)1016 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1017 {
1018 if (res->sr_slot != NULL)
1019 nfs40_sequence_free_slot(res);
1020 }
1021
nfs4_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)1022 int nfs4_sequence_done(struct rpc_task *task,
1023 struct nfs4_sequence_res *res)
1024 {
1025 return nfs40_sequence_done(task, res);
1026 }
1027 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1028
1029 #endif /* !CONFIG_NFS_V4_1 */
1030
nfs41_sequence_res_init(struct nfs4_sequence_res * res)1031 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
1032 {
1033 res->sr_timestamp = jiffies;
1034 res->sr_status_flags = 0;
1035 res->sr_status = 1;
1036 }
1037
1038 static
nfs4_sequence_attach_slot(struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,struct nfs4_slot * slot)1039 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
1040 struct nfs4_sequence_res *res,
1041 struct nfs4_slot *slot)
1042 {
1043 if (!slot)
1044 return;
1045 slot->privileged = args->sa_privileged ? 1 : 0;
1046 args->sa_slot = slot;
1047
1048 res->sr_slot = slot;
1049 }
1050
nfs4_setup_sequence(struct nfs_client * client,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,struct rpc_task * task)1051 int nfs4_setup_sequence(struct nfs_client *client,
1052 struct nfs4_sequence_args *args,
1053 struct nfs4_sequence_res *res,
1054 struct rpc_task *task)
1055 {
1056 struct nfs4_session *session = nfs4_get_session(client);
1057 struct nfs4_slot_table *tbl = client->cl_slot_tbl;
1058 struct nfs4_slot *slot;
1059
1060 /* slot already allocated? */
1061 if (res->sr_slot != NULL)
1062 goto out_start;
1063
1064 if (session)
1065 tbl = &session->fc_slot_table;
1066
1067 spin_lock(&tbl->slot_tbl_lock);
1068 /* The state manager will wait until the slot table is empty */
1069 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1070 goto out_sleep;
1071
1072 slot = nfs4_alloc_slot(tbl);
1073 if (IS_ERR(slot)) {
1074 if (slot == ERR_PTR(-ENOMEM))
1075 goto out_sleep_timeout;
1076 goto out_sleep;
1077 }
1078 spin_unlock(&tbl->slot_tbl_lock);
1079
1080 nfs4_sequence_attach_slot(args, res, slot);
1081
1082 trace_nfs4_setup_sequence(session, args);
1083 out_start:
1084 nfs41_sequence_res_init(res);
1085 rpc_call_start(task);
1086 return 0;
1087 out_sleep_timeout:
1088 /* Try again in 1/4 second */
1089 if (args->sa_privileged)
1090 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1091 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1092 else
1093 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1094 NULL, jiffies + (HZ >> 2));
1095 spin_unlock(&tbl->slot_tbl_lock);
1096 return -EAGAIN;
1097 out_sleep:
1098 if (args->sa_privileged)
1099 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1100 RPC_PRIORITY_PRIVILEGED);
1101 else
1102 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1103 spin_unlock(&tbl->slot_tbl_lock);
1104 return -EAGAIN;
1105 }
1106 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1107
nfs40_call_sync_prepare(struct rpc_task * task,void * calldata)1108 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1109 {
1110 struct nfs4_call_sync_data *data = calldata;
1111 nfs4_setup_sequence(data->seq_server->nfs_client,
1112 data->seq_args, data->seq_res, task);
1113 }
1114
nfs40_call_sync_done(struct rpc_task * task,void * calldata)1115 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1116 {
1117 struct nfs4_call_sync_data *data = calldata;
1118 nfs4_sequence_done(task, data->seq_res);
1119 }
1120
1121 static const struct rpc_call_ops nfs40_call_sync_ops = {
1122 .rpc_call_prepare = nfs40_call_sync_prepare,
1123 .rpc_call_done = nfs40_call_sync_done,
1124 };
1125
nfs4_call_sync_custom(struct rpc_task_setup * task_setup)1126 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
1127 {
1128 int ret;
1129 struct rpc_task *task;
1130
1131 task = rpc_run_task(task_setup);
1132 if (IS_ERR(task))
1133 return PTR_ERR(task);
1134
1135 ret = task->tk_status;
1136 rpc_put_task(task);
1137 return ret;
1138 }
1139
nfs4_do_call_sync(struct rpc_clnt * clnt,struct nfs_server * server,struct rpc_message * msg,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,unsigned short task_flags)1140 static int nfs4_do_call_sync(struct rpc_clnt *clnt,
1141 struct nfs_server *server,
1142 struct rpc_message *msg,
1143 struct nfs4_sequence_args *args,
1144 struct nfs4_sequence_res *res,
1145 unsigned short task_flags)
1146 {
1147 struct nfs_client *clp = server->nfs_client;
1148 struct nfs4_call_sync_data data = {
1149 .seq_server = server,
1150 .seq_args = args,
1151 .seq_res = res,
1152 };
1153 struct rpc_task_setup task_setup = {
1154 .rpc_client = clnt,
1155 .rpc_message = msg,
1156 .callback_ops = clp->cl_mvops->call_sync_ops,
1157 .callback_data = &data,
1158 .flags = task_flags,
1159 };
1160
1161 return nfs4_call_sync_custom(&task_setup);
1162 }
1163
nfs4_call_sync_sequence(struct rpc_clnt * clnt,struct nfs_server * server,struct rpc_message * msg,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res)1164 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1165 struct nfs_server *server,
1166 struct rpc_message *msg,
1167 struct nfs4_sequence_args *args,
1168 struct nfs4_sequence_res *res)
1169 {
1170 unsigned short task_flags = 0;
1171
1172 if (server->caps & NFS_CAP_MOVEABLE)
1173 task_flags = RPC_TASK_MOVEABLE;
1174 return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags);
1175 }
1176
1177
nfs4_call_sync(struct rpc_clnt * clnt,struct nfs_server * server,struct rpc_message * msg,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,int cache_reply)1178 int nfs4_call_sync(struct rpc_clnt *clnt,
1179 struct nfs_server *server,
1180 struct rpc_message *msg,
1181 struct nfs4_sequence_args *args,
1182 struct nfs4_sequence_res *res,
1183 int cache_reply)
1184 {
1185 nfs4_init_sequence(args, res, cache_reply, 0);
1186 return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1187 }
1188
1189 static void
nfs4_inc_nlink_locked(struct inode * inode)1190 nfs4_inc_nlink_locked(struct inode *inode)
1191 {
1192 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1193 NFS_INO_INVALID_CTIME |
1194 NFS_INO_INVALID_NLINK);
1195 inc_nlink(inode);
1196 }
1197
1198 static void
nfs4_inc_nlink(struct inode * inode)1199 nfs4_inc_nlink(struct inode *inode)
1200 {
1201 spin_lock(&inode->i_lock);
1202 nfs4_inc_nlink_locked(inode);
1203 spin_unlock(&inode->i_lock);
1204 }
1205
1206 static void
nfs4_dec_nlink_locked(struct inode * inode)1207 nfs4_dec_nlink_locked(struct inode *inode)
1208 {
1209 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1210 NFS_INO_INVALID_CTIME |
1211 NFS_INO_INVALID_NLINK);
1212 drop_nlink(inode);
1213 }
1214
1215 static void
nfs4_update_changeattr_locked(struct inode * inode,struct nfs4_change_info * cinfo,unsigned long timestamp,unsigned long cache_validity)1216 nfs4_update_changeattr_locked(struct inode *inode,
1217 struct nfs4_change_info *cinfo,
1218 unsigned long timestamp, unsigned long cache_validity)
1219 {
1220 struct nfs_inode *nfsi = NFS_I(inode);
1221 u64 change_attr = inode_peek_iversion_raw(inode);
1222
1223 cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
1224 if (S_ISDIR(inode->i_mode))
1225 cache_validity |= NFS_INO_INVALID_DATA;
1226
1227 switch (NFS_SERVER(inode)->change_attr_type) {
1228 case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1229 if (cinfo->after == change_attr)
1230 goto out;
1231 break;
1232 default:
1233 if ((s64)(change_attr - cinfo->after) >= 0)
1234 goto out;
1235 }
1236
1237 inode_set_iversion_raw(inode, cinfo->after);
1238 if (!cinfo->atomic || cinfo->before != change_attr) {
1239 if (S_ISDIR(inode->i_mode))
1240 nfs_force_lookup_revalidate(inode);
1241
1242 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1243 cache_validity |=
1244 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
1245 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER |
1246 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK |
1247 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR;
1248 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1249 }
1250 nfsi->attrtimeo_timestamp = jiffies;
1251 nfsi->read_cache_jiffies = timestamp;
1252 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1253 nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1254 out:
1255 nfs_set_cache_invalid(inode, cache_validity);
1256 }
1257
1258 void
nfs4_update_changeattr(struct inode * dir,struct nfs4_change_info * cinfo,unsigned long timestamp,unsigned long cache_validity)1259 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1260 unsigned long timestamp, unsigned long cache_validity)
1261 {
1262 spin_lock(&dir->i_lock);
1263 nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1264 spin_unlock(&dir->i_lock);
1265 }
1266
1267 struct nfs4_open_createattrs {
1268 struct nfs4_label *label;
1269 struct iattr *sattr;
1270 const __u32 verf[2];
1271 };
1272
nfs4_clear_cap_atomic_open_v1(struct nfs_server * server,int err,struct nfs4_exception * exception)1273 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1274 int err, struct nfs4_exception *exception)
1275 {
1276 if (err != -EINVAL)
1277 return false;
1278 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1279 return false;
1280 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1281 exception->retry = 1;
1282 return true;
1283 }
1284
_nfs4_ctx_to_accessmode(const struct nfs_open_context * ctx)1285 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1286 {
1287 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1288 }
1289
_nfs4_ctx_to_openmode(const struct nfs_open_context * ctx)1290 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1291 {
1292 fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1293
1294 return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1295 }
1296
1297 static u32
nfs4_map_atomic_open_share(struct nfs_server * server,fmode_t fmode,int openflags)1298 nfs4_map_atomic_open_share(struct nfs_server *server,
1299 fmode_t fmode, int openflags)
1300 {
1301 u32 res = 0;
1302
1303 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1304 case FMODE_READ:
1305 res = NFS4_SHARE_ACCESS_READ;
1306 break;
1307 case FMODE_WRITE:
1308 res = NFS4_SHARE_ACCESS_WRITE;
1309 break;
1310 case FMODE_READ|FMODE_WRITE:
1311 res = NFS4_SHARE_ACCESS_BOTH;
1312 }
1313 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1314 goto out;
1315 /* Want no delegation if we're using O_DIRECT */
1316 if (openflags & O_DIRECT)
1317 res |= NFS4_SHARE_WANT_NO_DELEG;
1318 out:
1319 return res;
1320 }
1321
1322 static enum open_claim_type4
nfs4_map_atomic_open_claim(struct nfs_server * server,enum open_claim_type4 claim)1323 nfs4_map_atomic_open_claim(struct nfs_server *server,
1324 enum open_claim_type4 claim)
1325 {
1326 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1327 return claim;
1328 switch (claim) {
1329 default:
1330 return claim;
1331 case NFS4_OPEN_CLAIM_FH:
1332 return NFS4_OPEN_CLAIM_NULL;
1333 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1334 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1335 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1336 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1337 }
1338 }
1339
nfs4_init_opendata_res(struct nfs4_opendata * p)1340 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1341 {
1342 p->o_res.f_attr = &p->f_attr;
1343 p->o_res.seqid = p->o_arg.seqid;
1344 p->c_res.seqid = p->c_arg.seqid;
1345 p->o_res.server = p->o_arg.server;
1346 p->o_res.access_request = p->o_arg.access;
1347 nfs_fattr_init(&p->f_attr);
1348 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1349 }
1350
nfs4_opendata_alloc(struct dentry * dentry,struct nfs4_state_owner * sp,fmode_t fmode,int flags,const struct nfs4_open_createattrs * c,enum open_claim_type4 claim,gfp_t gfp_mask)1351 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1352 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1353 const struct nfs4_open_createattrs *c,
1354 enum open_claim_type4 claim,
1355 gfp_t gfp_mask)
1356 {
1357 struct dentry *parent = dget_parent(dentry);
1358 struct inode *dir = d_inode(parent);
1359 struct nfs_server *server = NFS_SERVER(dir);
1360 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1361 struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1362 struct nfs4_opendata *p;
1363
1364 p = kzalloc(sizeof(*p), gfp_mask);
1365 if (p == NULL)
1366 goto err;
1367
1368 p->f_attr.label = nfs4_label_alloc(server, gfp_mask);
1369 if (IS_ERR(p->f_attr.label))
1370 goto err_free_p;
1371
1372 p->a_label = nfs4_label_alloc(server, gfp_mask);
1373 if (IS_ERR(p->a_label))
1374 goto err_free_f;
1375
1376 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1377 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1378 if (IS_ERR(p->o_arg.seqid))
1379 goto err_free_label;
1380 nfs_sb_active(dentry->d_sb);
1381 p->dentry = dget(dentry);
1382 p->dir = parent;
1383 p->owner = sp;
1384 atomic_inc(&sp->so_count);
1385 p->o_arg.open_flags = flags;
1386 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1387 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1388 p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1389 fmode, flags);
1390 if (flags & O_CREAT) {
1391 p->o_arg.umask = current_umask();
1392 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1393 if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1394 p->o_arg.u.attrs = &p->attrs;
1395 memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1396
1397 memcpy(p->o_arg.u.verifier.data, c->verf,
1398 sizeof(p->o_arg.u.verifier.data));
1399 }
1400 }
1401 /* ask server to check for all possible rights as results
1402 * are cached */
1403 switch (p->o_arg.claim) {
1404 default:
1405 break;
1406 case NFS4_OPEN_CLAIM_NULL:
1407 case NFS4_OPEN_CLAIM_FH:
1408 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1409 NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE |
1410 NFS4_ACCESS_EXECUTE |
1411 nfs_access_xattr_mask(server);
1412 }
1413 p->o_arg.clientid = server->nfs_client->cl_clientid;
1414 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1415 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1416 p->o_arg.name = &dentry->d_name;
1417 p->o_arg.server = server;
1418 p->o_arg.bitmask = nfs4_bitmask(server, label);
1419 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1420 switch (p->o_arg.claim) {
1421 case NFS4_OPEN_CLAIM_NULL:
1422 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1423 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1424 p->o_arg.fh = NFS_FH(dir);
1425 break;
1426 case NFS4_OPEN_CLAIM_PREVIOUS:
1427 case NFS4_OPEN_CLAIM_FH:
1428 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1429 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1430 p->o_arg.fh = NFS_FH(d_inode(dentry));
1431 }
1432 p->c_arg.fh = &p->o_res.fh;
1433 p->c_arg.stateid = &p->o_res.stateid;
1434 p->c_arg.seqid = p->o_arg.seqid;
1435 nfs4_init_opendata_res(p);
1436 kref_init(&p->kref);
1437 return p;
1438
1439 err_free_label:
1440 nfs4_label_free(p->a_label);
1441 err_free_f:
1442 nfs4_label_free(p->f_attr.label);
1443 err_free_p:
1444 kfree(p);
1445 err:
1446 dput(parent);
1447 return NULL;
1448 }
1449
nfs4_opendata_free(struct kref * kref)1450 static void nfs4_opendata_free(struct kref *kref)
1451 {
1452 struct nfs4_opendata *p = container_of(kref,
1453 struct nfs4_opendata, kref);
1454 struct super_block *sb = p->dentry->d_sb;
1455
1456 nfs4_lgopen_release(p->lgp);
1457 nfs_free_seqid(p->o_arg.seqid);
1458 nfs4_sequence_free_slot(&p->o_res.seq_res);
1459 if (p->state != NULL)
1460 nfs4_put_open_state(p->state);
1461 nfs4_put_state_owner(p->owner);
1462
1463 nfs4_label_free(p->a_label);
1464 nfs4_label_free(p->f_attr.label);
1465
1466 dput(p->dir);
1467 dput(p->dentry);
1468 nfs_sb_deactive(sb);
1469 nfs_fattr_free_names(&p->f_attr);
1470 kfree(p->f_attr.mdsthreshold);
1471 kfree(p);
1472 }
1473
nfs4_opendata_put(struct nfs4_opendata * p)1474 static void nfs4_opendata_put(struct nfs4_opendata *p)
1475 {
1476 if (p != NULL)
1477 kref_put(&p->kref, nfs4_opendata_free);
1478 }
1479
nfs4_mode_match_open_stateid(struct nfs4_state * state,fmode_t fmode)1480 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1481 fmode_t fmode)
1482 {
1483 switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1484 case FMODE_READ|FMODE_WRITE:
1485 return state->n_rdwr != 0;
1486 case FMODE_WRITE:
1487 return state->n_wronly != 0;
1488 case FMODE_READ:
1489 return state->n_rdonly != 0;
1490 }
1491 WARN_ON_ONCE(1);
1492 return false;
1493 }
1494
can_open_cached(struct nfs4_state * state,fmode_t mode,int open_mode,enum open_claim_type4 claim)1495 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1496 int open_mode, enum open_claim_type4 claim)
1497 {
1498 int ret = 0;
1499
1500 if (open_mode & (O_EXCL|O_TRUNC))
1501 goto out;
1502 switch (claim) {
1503 case NFS4_OPEN_CLAIM_NULL:
1504 case NFS4_OPEN_CLAIM_FH:
1505 goto out;
1506 default:
1507 break;
1508 }
1509 switch (mode & (FMODE_READ|FMODE_WRITE)) {
1510 case FMODE_READ:
1511 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1512 && state->n_rdonly != 0;
1513 break;
1514 case FMODE_WRITE:
1515 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1516 && state->n_wronly != 0;
1517 break;
1518 case FMODE_READ|FMODE_WRITE:
1519 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1520 && state->n_rdwr != 0;
1521 }
1522 out:
1523 return ret;
1524 }
1525
can_open_delegated(struct nfs_delegation * delegation,fmode_t fmode,enum open_claim_type4 claim)1526 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1527 enum open_claim_type4 claim)
1528 {
1529 if (delegation == NULL)
1530 return 0;
1531 if ((delegation->type & fmode) != fmode)
1532 return 0;
1533 switch (claim) {
1534 case NFS4_OPEN_CLAIM_NULL:
1535 case NFS4_OPEN_CLAIM_FH:
1536 break;
1537 case NFS4_OPEN_CLAIM_PREVIOUS:
1538 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1539 break;
1540 fallthrough;
1541 default:
1542 return 0;
1543 }
1544 nfs_mark_delegation_referenced(delegation);
1545 return 1;
1546 }
1547
update_open_stateflags(struct nfs4_state * state,fmode_t fmode)1548 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1549 {
1550 switch (fmode) {
1551 case FMODE_WRITE:
1552 state->n_wronly++;
1553 break;
1554 case FMODE_READ:
1555 state->n_rdonly++;
1556 break;
1557 case FMODE_READ|FMODE_WRITE:
1558 state->n_rdwr++;
1559 }
1560 nfs4_state_set_mode_locked(state, state->state | fmode);
1561 }
1562
1563 #ifdef CONFIG_NFS_V4_1
nfs_open_stateid_recover_openmode(struct nfs4_state * state)1564 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1565 {
1566 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1567 return true;
1568 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1569 return true;
1570 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1571 return true;
1572 return false;
1573 }
1574 #endif /* CONFIG_NFS_V4_1 */
1575
nfs_state_log_update_open_stateid(struct nfs4_state * state)1576 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1577 {
1578 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1579 wake_up_all(&state->waitq);
1580 }
1581
nfs_test_and_clear_all_open_stateid(struct nfs4_state * state)1582 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1583 {
1584 struct nfs_client *clp = state->owner->so_server->nfs_client;
1585 bool need_recover = false;
1586
1587 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1588 need_recover = true;
1589 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1590 need_recover = true;
1591 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1592 need_recover = true;
1593 if (need_recover)
1594 nfs4_state_mark_reclaim_nograce(clp, state);
1595 }
1596
1597 /*
1598 * Check for whether or not the caller may update the open stateid
1599 * to the value passed in by stateid.
1600 *
1601 * Note: This function relies heavily on the server implementing
1602 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1603 * correctly.
1604 * i.e. The stateid seqids have to be initialised to 1, and
1605 * are then incremented on every state transition.
1606 */
nfs_stateid_is_sequential(struct nfs4_state * state,const nfs4_stateid * stateid)1607 static bool nfs_stateid_is_sequential(struct nfs4_state *state,
1608 const nfs4_stateid *stateid)
1609 {
1610 if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1611 /* The common case - we're updating to a new sequence number */
1612 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1613 if (nfs4_stateid_is_next(&state->open_stateid, stateid))
1614 return true;
1615 return false;
1616 }
1617 /* The server returned a new stateid */
1618 }
1619 /* This is the first OPEN in this generation */
1620 if (stateid->seqid == cpu_to_be32(1))
1621 return true;
1622 return false;
1623 }
1624
nfs_resync_open_stateid_locked(struct nfs4_state * state)1625 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1626 {
1627 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1628 return;
1629 if (state->n_wronly)
1630 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1631 if (state->n_rdonly)
1632 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1633 if (state->n_rdwr)
1634 set_bit(NFS_O_RDWR_STATE, &state->flags);
1635 set_bit(NFS_OPEN_STATE, &state->flags);
1636 }
1637
nfs_clear_open_stateid_locked(struct nfs4_state * state,nfs4_stateid * stateid,fmode_t fmode)1638 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1639 nfs4_stateid *stateid, fmode_t fmode)
1640 {
1641 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1642 switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1643 case FMODE_WRITE:
1644 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1645 break;
1646 case FMODE_READ:
1647 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1648 break;
1649 case 0:
1650 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1651 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1652 clear_bit(NFS_OPEN_STATE, &state->flags);
1653 }
1654 if (stateid == NULL)
1655 return;
1656 /* Handle OPEN+OPEN_DOWNGRADE races */
1657 if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1658 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1659 nfs_resync_open_stateid_locked(state);
1660 goto out;
1661 }
1662 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1663 nfs4_stateid_copy(&state->stateid, stateid);
1664 nfs4_stateid_copy(&state->open_stateid, stateid);
1665 trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1666 out:
1667 nfs_state_log_update_open_stateid(state);
1668 }
1669
nfs_clear_open_stateid(struct nfs4_state * state,nfs4_stateid * arg_stateid,nfs4_stateid * stateid,fmode_t fmode)1670 static void nfs_clear_open_stateid(struct nfs4_state *state,
1671 nfs4_stateid *arg_stateid,
1672 nfs4_stateid *stateid, fmode_t fmode)
1673 {
1674 write_seqlock(&state->seqlock);
1675 /* Ignore, if the CLOSE argment doesn't match the current stateid */
1676 if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1677 nfs_clear_open_stateid_locked(state, stateid, fmode);
1678 write_sequnlock(&state->seqlock);
1679 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1680 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1681 }
1682
nfs_set_open_stateid_locked(struct nfs4_state * state,const nfs4_stateid * stateid,nfs4_stateid * freeme)1683 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1684 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1685 __must_hold(&state->owner->so_lock)
1686 __must_hold(&state->seqlock)
1687 __must_hold(RCU)
1688
1689 {
1690 DEFINE_WAIT(wait);
1691 int status = 0;
1692 for (;;) {
1693
1694 if (nfs_stateid_is_sequential(state, stateid))
1695 break;
1696
1697 if (status)
1698 break;
1699 /* Rely on seqids for serialisation with NFSv4.0 */
1700 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1701 break;
1702
1703 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1704 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1705 /*
1706 * Ensure we process the state changes in the same order
1707 * in which the server processed them by delaying the
1708 * update of the stateid until we are in sequence.
1709 */
1710 write_sequnlock(&state->seqlock);
1711 spin_unlock(&state->owner->so_lock);
1712 rcu_read_unlock();
1713 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1714
1715 if (!fatal_signal_pending(current)) {
1716 if (schedule_timeout(5*HZ) == 0)
1717 status = -EAGAIN;
1718 else
1719 status = 0;
1720 } else
1721 status = -EINTR;
1722 finish_wait(&state->waitq, &wait);
1723 rcu_read_lock();
1724 spin_lock(&state->owner->so_lock);
1725 write_seqlock(&state->seqlock);
1726 }
1727
1728 if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1729 !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1730 nfs4_stateid_copy(freeme, &state->open_stateid);
1731 nfs_test_and_clear_all_open_stateid(state);
1732 }
1733
1734 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1735 nfs4_stateid_copy(&state->stateid, stateid);
1736 nfs4_stateid_copy(&state->open_stateid, stateid);
1737 trace_nfs4_open_stateid_update(state->inode, stateid, status);
1738 nfs_state_log_update_open_stateid(state);
1739 }
1740
nfs_state_set_open_stateid(struct nfs4_state * state,const nfs4_stateid * open_stateid,fmode_t fmode,nfs4_stateid * freeme)1741 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1742 const nfs4_stateid *open_stateid,
1743 fmode_t fmode,
1744 nfs4_stateid *freeme)
1745 {
1746 /*
1747 * Protect the call to nfs4_state_set_mode_locked and
1748 * serialise the stateid update
1749 */
1750 write_seqlock(&state->seqlock);
1751 nfs_set_open_stateid_locked(state, open_stateid, freeme);
1752 switch (fmode) {
1753 case FMODE_READ:
1754 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1755 break;
1756 case FMODE_WRITE:
1757 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1758 break;
1759 case FMODE_READ|FMODE_WRITE:
1760 set_bit(NFS_O_RDWR_STATE, &state->flags);
1761 }
1762 set_bit(NFS_OPEN_STATE, &state->flags);
1763 write_sequnlock(&state->seqlock);
1764 }
1765
nfs_state_clear_open_state_flags(struct nfs4_state * state)1766 static void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1767 {
1768 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1769 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1770 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1771 clear_bit(NFS_OPEN_STATE, &state->flags);
1772 }
1773
nfs_state_set_delegation(struct nfs4_state * state,const nfs4_stateid * deleg_stateid,fmode_t fmode)1774 static void nfs_state_set_delegation(struct nfs4_state *state,
1775 const nfs4_stateid *deleg_stateid,
1776 fmode_t fmode)
1777 {
1778 /*
1779 * Protect the call to nfs4_state_set_mode_locked and
1780 * serialise the stateid update
1781 */
1782 write_seqlock(&state->seqlock);
1783 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1784 set_bit(NFS_DELEGATED_STATE, &state->flags);
1785 write_sequnlock(&state->seqlock);
1786 }
1787
nfs_state_clear_delegation(struct nfs4_state * state)1788 static void nfs_state_clear_delegation(struct nfs4_state *state)
1789 {
1790 write_seqlock(&state->seqlock);
1791 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1792 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1793 write_sequnlock(&state->seqlock);
1794 }
1795
update_open_stateid(struct nfs4_state * state,const nfs4_stateid * open_stateid,const nfs4_stateid * delegation,fmode_t fmode)1796 int update_open_stateid(struct nfs4_state *state,
1797 const nfs4_stateid *open_stateid,
1798 const nfs4_stateid *delegation,
1799 fmode_t fmode)
1800 {
1801 struct nfs_server *server = NFS_SERVER(state->inode);
1802 struct nfs_client *clp = server->nfs_client;
1803 struct nfs_inode *nfsi = NFS_I(state->inode);
1804 struct nfs_delegation *deleg_cur;
1805 nfs4_stateid freeme = { };
1806 int ret = 0;
1807
1808 fmode &= (FMODE_READ|FMODE_WRITE);
1809
1810 rcu_read_lock();
1811 spin_lock(&state->owner->so_lock);
1812 if (open_stateid != NULL) {
1813 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1814 ret = 1;
1815 }
1816
1817 deleg_cur = nfs4_get_valid_delegation(state->inode);
1818 if (deleg_cur == NULL)
1819 goto no_delegation;
1820
1821 spin_lock(&deleg_cur->lock);
1822 if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1823 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1824 (deleg_cur->type & fmode) != fmode)
1825 goto no_delegation_unlock;
1826
1827 if (delegation == NULL)
1828 delegation = &deleg_cur->stateid;
1829 else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
1830 goto no_delegation_unlock;
1831
1832 nfs_mark_delegation_referenced(deleg_cur);
1833 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1834 ret = 1;
1835 no_delegation_unlock:
1836 spin_unlock(&deleg_cur->lock);
1837 no_delegation:
1838 if (ret)
1839 update_open_stateflags(state, fmode);
1840 spin_unlock(&state->owner->so_lock);
1841 rcu_read_unlock();
1842
1843 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1844 nfs4_schedule_state_manager(clp);
1845 if (freeme.type != 0)
1846 nfs4_test_and_free_stateid(server, &freeme,
1847 state->owner->so_cred);
1848
1849 return ret;
1850 }
1851
nfs4_update_lock_stateid(struct nfs4_lock_state * lsp,const nfs4_stateid * stateid)1852 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1853 const nfs4_stateid *stateid)
1854 {
1855 struct nfs4_state *state = lsp->ls_state;
1856 bool ret = false;
1857
1858 spin_lock(&state->state_lock);
1859 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1860 goto out_noupdate;
1861 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1862 goto out_noupdate;
1863 nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1864 ret = true;
1865 out_noupdate:
1866 spin_unlock(&state->state_lock);
1867 return ret;
1868 }
1869
nfs4_return_incompatible_delegation(struct inode * inode,fmode_t fmode)1870 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1871 {
1872 struct nfs_delegation *delegation;
1873
1874 fmode &= FMODE_READ|FMODE_WRITE;
1875 rcu_read_lock();
1876 delegation = nfs4_get_valid_delegation(inode);
1877 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1878 rcu_read_unlock();
1879 return;
1880 }
1881 rcu_read_unlock();
1882 nfs4_inode_return_delegation(inode);
1883 }
1884
nfs4_try_open_cached(struct nfs4_opendata * opendata)1885 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1886 {
1887 struct nfs4_state *state = opendata->state;
1888 struct nfs_delegation *delegation;
1889 int open_mode = opendata->o_arg.open_flags;
1890 fmode_t fmode = opendata->o_arg.fmode;
1891 enum open_claim_type4 claim = opendata->o_arg.claim;
1892 nfs4_stateid stateid;
1893 int ret = -EAGAIN;
1894
1895 for (;;) {
1896 spin_lock(&state->owner->so_lock);
1897 if (can_open_cached(state, fmode, open_mode, claim)) {
1898 update_open_stateflags(state, fmode);
1899 spin_unlock(&state->owner->so_lock);
1900 goto out_return_state;
1901 }
1902 spin_unlock(&state->owner->so_lock);
1903 rcu_read_lock();
1904 delegation = nfs4_get_valid_delegation(state->inode);
1905 if (!can_open_delegated(delegation, fmode, claim)) {
1906 rcu_read_unlock();
1907 break;
1908 }
1909 /* Save the delegation */
1910 nfs4_stateid_copy(&stateid, &delegation->stateid);
1911 rcu_read_unlock();
1912 nfs_release_seqid(opendata->o_arg.seqid);
1913 if (!opendata->is_recover) {
1914 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1915 if (ret != 0)
1916 goto out;
1917 }
1918 ret = -EAGAIN;
1919
1920 /* Try to update the stateid using the delegation */
1921 if (update_open_stateid(state, NULL, &stateid, fmode))
1922 goto out_return_state;
1923 }
1924 out:
1925 return ERR_PTR(ret);
1926 out_return_state:
1927 refcount_inc(&state->count);
1928 return state;
1929 }
1930
1931 static void
nfs4_opendata_check_deleg(struct nfs4_opendata * data,struct nfs4_state * state)1932 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1933 {
1934 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1935 struct nfs_delegation *delegation;
1936 int delegation_flags = 0;
1937
1938 rcu_read_lock();
1939 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1940 if (delegation)
1941 delegation_flags = delegation->flags;
1942 rcu_read_unlock();
1943 switch (data->o_arg.claim) {
1944 default:
1945 break;
1946 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1947 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1948 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1949 "returning a delegation for "
1950 "OPEN(CLAIM_DELEGATE_CUR)\n",
1951 clp->cl_hostname);
1952 return;
1953 }
1954 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1955 nfs_inode_set_delegation(state->inode,
1956 data->owner->so_cred,
1957 data->o_res.delegation_type,
1958 &data->o_res.delegation,
1959 data->o_res.pagemod_limit);
1960 else
1961 nfs_inode_reclaim_delegation(state->inode,
1962 data->owner->so_cred,
1963 data->o_res.delegation_type,
1964 &data->o_res.delegation,
1965 data->o_res.pagemod_limit);
1966
1967 if (data->o_res.do_recall)
1968 nfs_async_inode_return_delegation(state->inode,
1969 &data->o_res.delegation);
1970 }
1971
1972 /*
1973 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1974 * and update the nfs4_state.
1975 */
1976 static struct nfs4_state *
_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata * data)1977 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1978 {
1979 struct inode *inode = data->state->inode;
1980 struct nfs4_state *state = data->state;
1981 int ret;
1982
1983 if (!data->rpc_done) {
1984 if (data->rpc_status)
1985 return ERR_PTR(data->rpc_status);
1986 return nfs4_try_open_cached(data);
1987 }
1988
1989 ret = nfs_refresh_inode(inode, &data->f_attr);
1990 if (ret)
1991 return ERR_PTR(ret);
1992
1993 if (data->o_res.delegation_type != 0)
1994 nfs4_opendata_check_deleg(data, state);
1995
1996 if (!update_open_stateid(state, &data->o_res.stateid,
1997 NULL, data->o_arg.fmode))
1998 return ERR_PTR(-EAGAIN);
1999 refcount_inc(&state->count);
2000
2001 return state;
2002 }
2003
2004 static struct inode *
nfs4_opendata_get_inode(struct nfs4_opendata * data)2005 nfs4_opendata_get_inode(struct nfs4_opendata *data)
2006 {
2007 struct inode *inode;
2008
2009 switch (data->o_arg.claim) {
2010 case NFS4_OPEN_CLAIM_NULL:
2011 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2012 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
2013 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
2014 return ERR_PTR(-EAGAIN);
2015 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
2016 &data->f_attr);
2017 break;
2018 default:
2019 inode = d_inode(data->dentry);
2020 ihold(inode);
2021 nfs_refresh_inode(inode, &data->f_attr);
2022 }
2023 return inode;
2024 }
2025
2026 static struct nfs4_state *
nfs4_opendata_find_nfs4_state(struct nfs4_opendata * data)2027 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
2028 {
2029 struct nfs4_state *state;
2030 struct inode *inode;
2031
2032 inode = nfs4_opendata_get_inode(data);
2033 if (IS_ERR(inode))
2034 return ERR_CAST(inode);
2035 if (data->state != NULL && data->state->inode == inode) {
2036 state = data->state;
2037 refcount_inc(&state->count);
2038 } else
2039 state = nfs4_get_open_state(inode, data->owner);
2040 iput(inode);
2041 if (state == NULL)
2042 state = ERR_PTR(-ENOMEM);
2043 return state;
2044 }
2045
2046 static struct nfs4_state *
_nfs4_opendata_to_nfs4_state(struct nfs4_opendata * data)2047 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2048 {
2049 struct nfs4_state *state;
2050
2051 if (!data->rpc_done) {
2052 state = nfs4_try_open_cached(data);
2053 trace_nfs4_cached_open(data->state);
2054 goto out;
2055 }
2056
2057 state = nfs4_opendata_find_nfs4_state(data);
2058 if (IS_ERR(state))
2059 goto out;
2060
2061 if (data->o_res.delegation_type != 0)
2062 nfs4_opendata_check_deleg(data, state);
2063 if (!update_open_stateid(state, &data->o_res.stateid,
2064 NULL, data->o_arg.fmode)) {
2065 nfs4_put_open_state(state);
2066 state = ERR_PTR(-EAGAIN);
2067 }
2068 out:
2069 nfs_release_seqid(data->o_arg.seqid);
2070 return state;
2071 }
2072
2073 static struct nfs4_state *
nfs4_opendata_to_nfs4_state(struct nfs4_opendata * data)2074 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2075 {
2076 struct nfs4_state *ret;
2077
2078 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2079 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2080 else
2081 ret = _nfs4_opendata_to_nfs4_state(data);
2082 nfs4_sequence_free_slot(&data->o_res.seq_res);
2083 return ret;
2084 }
2085
2086 static struct nfs_open_context *
nfs4_state_find_open_context_mode(struct nfs4_state * state,fmode_t mode)2087 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2088 {
2089 struct nfs_inode *nfsi = NFS_I(state->inode);
2090 struct nfs_open_context *ctx;
2091
2092 rcu_read_lock();
2093 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2094 if (ctx->state != state)
2095 continue;
2096 if ((ctx->mode & mode) != mode)
2097 continue;
2098 if (!get_nfs_open_context(ctx))
2099 continue;
2100 rcu_read_unlock();
2101 return ctx;
2102 }
2103 rcu_read_unlock();
2104 return ERR_PTR(-ENOENT);
2105 }
2106
2107 static struct nfs_open_context *
nfs4_state_find_open_context(struct nfs4_state * state)2108 nfs4_state_find_open_context(struct nfs4_state *state)
2109 {
2110 struct nfs_open_context *ctx;
2111
2112 ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2113 if (!IS_ERR(ctx))
2114 return ctx;
2115 ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2116 if (!IS_ERR(ctx))
2117 return ctx;
2118 return nfs4_state_find_open_context_mode(state, FMODE_READ);
2119 }
2120
nfs4_open_recoverdata_alloc(struct nfs_open_context * ctx,struct nfs4_state * state,enum open_claim_type4 claim)2121 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2122 struct nfs4_state *state, enum open_claim_type4 claim)
2123 {
2124 struct nfs4_opendata *opendata;
2125
2126 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2127 NULL, claim, GFP_NOFS);
2128 if (opendata == NULL)
2129 return ERR_PTR(-ENOMEM);
2130 opendata->state = state;
2131 refcount_inc(&state->count);
2132 return opendata;
2133 }
2134
nfs4_open_recover_helper(struct nfs4_opendata * opendata,fmode_t fmode)2135 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2136 fmode_t fmode)
2137 {
2138 struct nfs4_state *newstate;
2139 struct nfs_server *server = NFS_SB(opendata->dentry->d_sb);
2140 int openflags = opendata->o_arg.open_flags;
2141 int ret;
2142
2143 if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2144 return 0;
2145 opendata->o_arg.fmode = fmode;
2146 opendata->o_arg.share_access =
2147 nfs4_map_atomic_open_share(server, fmode, openflags);
2148 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2149 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2150 nfs4_init_opendata_res(opendata);
2151 ret = _nfs4_recover_proc_open(opendata);
2152 if (ret != 0)
2153 return ret;
2154 newstate = nfs4_opendata_to_nfs4_state(opendata);
2155 if (IS_ERR(newstate))
2156 return PTR_ERR(newstate);
2157 if (newstate != opendata->state)
2158 ret = -ESTALE;
2159 nfs4_close_state(newstate, fmode);
2160 return ret;
2161 }
2162
nfs4_open_recover(struct nfs4_opendata * opendata,struct nfs4_state * state)2163 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2164 {
2165 int ret;
2166
2167 /* memory barrier prior to reading state->n_* */
2168 smp_rmb();
2169 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2170 if (ret != 0)
2171 return ret;
2172 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2173 if (ret != 0)
2174 return ret;
2175 ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2176 if (ret != 0)
2177 return ret;
2178 /*
2179 * We may have performed cached opens for all three recoveries.
2180 * Check if we need to update the current stateid.
2181 */
2182 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2183 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2184 write_seqlock(&state->seqlock);
2185 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2186 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2187 write_sequnlock(&state->seqlock);
2188 }
2189 return 0;
2190 }
2191
2192 /*
2193 * OPEN_RECLAIM:
2194 * reclaim state on the server after a reboot.
2195 */
_nfs4_do_open_reclaim(struct nfs_open_context * ctx,struct nfs4_state * state)2196 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2197 {
2198 struct nfs_delegation *delegation;
2199 struct nfs4_opendata *opendata;
2200 fmode_t delegation_type = 0;
2201 int status;
2202
2203 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2204 NFS4_OPEN_CLAIM_PREVIOUS);
2205 if (IS_ERR(opendata))
2206 return PTR_ERR(opendata);
2207 rcu_read_lock();
2208 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2209 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
2210 delegation_type = delegation->type;
2211 rcu_read_unlock();
2212 opendata->o_arg.u.delegation_type = delegation_type;
2213 status = nfs4_open_recover(opendata, state);
2214 nfs4_opendata_put(opendata);
2215 return status;
2216 }
2217
nfs4_do_open_reclaim(struct nfs_open_context * ctx,struct nfs4_state * state)2218 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2219 {
2220 struct nfs_server *server = NFS_SERVER(state->inode);
2221 struct nfs4_exception exception = { };
2222 int err;
2223 do {
2224 err = _nfs4_do_open_reclaim(ctx, state);
2225 trace_nfs4_open_reclaim(ctx, 0, err);
2226 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2227 continue;
2228 if (err != -NFS4ERR_DELAY)
2229 break;
2230 nfs4_handle_exception(server, err, &exception);
2231 } while (exception.retry);
2232 return err;
2233 }
2234
nfs4_open_reclaim(struct nfs4_state_owner * sp,struct nfs4_state * state)2235 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2236 {
2237 struct nfs_open_context *ctx;
2238 int ret;
2239
2240 ctx = nfs4_state_find_open_context(state);
2241 if (IS_ERR(ctx))
2242 return -EAGAIN;
2243 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2244 nfs_state_clear_open_state_flags(state);
2245 ret = nfs4_do_open_reclaim(ctx, state);
2246 put_nfs_open_context(ctx);
2247 return ret;
2248 }
2249
nfs4_handle_delegation_recall_error(struct nfs_server * server,struct nfs4_state * state,const nfs4_stateid * stateid,struct file_lock * fl,int err)2250 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err)
2251 {
2252 switch (err) {
2253 default:
2254 printk(KERN_ERR "NFS: %s: unhandled error "
2255 "%d.\n", __func__, err);
2256 fallthrough;
2257 case 0:
2258 case -ENOENT:
2259 case -EAGAIN:
2260 case -ESTALE:
2261 case -ETIMEDOUT:
2262 break;
2263 case -NFS4ERR_BADSESSION:
2264 case -NFS4ERR_BADSLOT:
2265 case -NFS4ERR_BAD_HIGH_SLOT:
2266 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2267 case -NFS4ERR_DEADSESSION:
2268 return -EAGAIN;
2269 case -NFS4ERR_STALE_CLIENTID:
2270 case -NFS4ERR_STALE_STATEID:
2271 /* Don't recall a delegation if it was lost */
2272 nfs4_schedule_lease_recovery(server->nfs_client);
2273 return -EAGAIN;
2274 case -NFS4ERR_MOVED:
2275 nfs4_schedule_migration_recovery(server);
2276 return -EAGAIN;
2277 case -NFS4ERR_LEASE_MOVED:
2278 nfs4_schedule_lease_moved_recovery(server->nfs_client);
2279 return -EAGAIN;
2280 case -NFS4ERR_DELEG_REVOKED:
2281 case -NFS4ERR_ADMIN_REVOKED:
2282 case -NFS4ERR_EXPIRED:
2283 case -NFS4ERR_BAD_STATEID:
2284 case -NFS4ERR_OPENMODE:
2285 nfs_inode_find_state_and_recover(state->inode,
2286 stateid);
2287 nfs4_schedule_stateid_recovery(server, state);
2288 return -EAGAIN;
2289 case -NFS4ERR_DELAY:
2290 case -NFS4ERR_GRACE:
2291 ssleep(1);
2292 return -EAGAIN;
2293 case -ENOMEM:
2294 case -NFS4ERR_DENIED:
2295 if (fl) {
2296 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2297 if (lsp)
2298 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2299 }
2300 return 0;
2301 }
2302 return err;
2303 }
2304
nfs4_open_delegation_recall(struct nfs_open_context * ctx,struct nfs4_state * state,const nfs4_stateid * stateid)2305 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2306 struct nfs4_state *state, const nfs4_stateid *stateid)
2307 {
2308 struct nfs_server *server = NFS_SERVER(state->inode);
2309 struct nfs4_opendata *opendata;
2310 int err = 0;
2311
2312 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2313 NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2314 if (IS_ERR(opendata))
2315 return PTR_ERR(opendata);
2316 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2317 if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2318 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2319 if (err)
2320 goto out;
2321 }
2322 if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2323 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2324 if (err)
2325 goto out;
2326 }
2327 if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2328 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2329 if (err)
2330 goto out;
2331 }
2332 nfs_state_clear_delegation(state);
2333 out:
2334 nfs4_opendata_put(opendata);
2335 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2336 }
2337
nfs4_open_confirm_prepare(struct rpc_task * task,void * calldata)2338 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2339 {
2340 struct nfs4_opendata *data = calldata;
2341
2342 nfs4_setup_sequence(data->o_arg.server->nfs_client,
2343 &data->c_arg.seq_args, &data->c_res.seq_res, task);
2344 }
2345
nfs4_open_confirm_done(struct rpc_task * task,void * calldata)2346 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2347 {
2348 struct nfs4_opendata *data = calldata;
2349
2350 nfs40_sequence_done(task, &data->c_res.seq_res);
2351
2352 data->rpc_status = task->tk_status;
2353 if (data->rpc_status == 0) {
2354 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2355 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2356 renew_lease(data->o_res.server, data->timestamp);
2357 data->rpc_done = true;
2358 }
2359 }
2360
nfs4_open_confirm_release(void * calldata)2361 static void nfs4_open_confirm_release(void *calldata)
2362 {
2363 struct nfs4_opendata *data = calldata;
2364 struct nfs4_state *state = NULL;
2365
2366 /* If this request hasn't been cancelled, do nothing */
2367 if (!data->cancelled)
2368 goto out_free;
2369 /* In case of error, no cleanup! */
2370 if (!data->rpc_done)
2371 goto out_free;
2372 state = nfs4_opendata_to_nfs4_state(data);
2373 if (!IS_ERR(state))
2374 nfs4_close_state(state, data->o_arg.fmode);
2375 out_free:
2376 nfs4_opendata_put(data);
2377 }
2378
2379 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2380 .rpc_call_prepare = nfs4_open_confirm_prepare,
2381 .rpc_call_done = nfs4_open_confirm_done,
2382 .rpc_release = nfs4_open_confirm_release,
2383 };
2384
2385 /*
2386 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2387 */
_nfs4_proc_open_confirm(struct nfs4_opendata * data)2388 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2389 {
2390 struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2391 struct rpc_task *task;
2392 struct rpc_message msg = {
2393 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2394 .rpc_argp = &data->c_arg,
2395 .rpc_resp = &data->c_res,
2396 .rpc_cred = data->owner->so_cred,
2397 };
2398 struct rpc_task_setup task_setup_data = {
2399 .rpc_client = server->client,
2400 .rpc_message = &msg,
2401 .callback_ops = &nfs4_open_confirm_ops,
2402 .callback_data = data,
2403 .workqueue = nfsiod_workqueue,
2404 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2405 };
2406 int status;
2407
2408 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2409 data->is_recover);
2410 kref_get(&data->kref);
2411 data->rpc_done = false;
2412 data->rpc_status = 0;
2413 data->timestamp = jiffies;
2414 task = rpc_run_task(&task_setup_data);
2415 if (IS_ERR(task))
2416 return PTR_ERR(task);
2417 status = rpc_wait_for_completion_task(task);
2418 if (status != 0) {
2419 data->cancelled = true;
2420 smp_wmb();
2421 } else
2422 status = data->rpc_status;
2423 rpc_put_task(task);
2424 return status;
2425 }
2426
nfs4_open_prepare(struct rpc_task * task,void * calldata)2427 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2428 {
2429 struct nfs4_opendata *data = calldata;
2430 struct nfs4_state_owner *sp = data->owner;
2431 struct nfs_client *clp = sp->so_server->nfs_client;
2432 enum open_claim_type4 claim = data->o_arg.claim;
2433
2434 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2435 goto out_wait;
2436 /*
2437 * Check if we still need to send an OPEN call, or if we can use
2438 * a delegation instead.
2439 */
2440 if (data->state != NULL) {
2441 struct nfs_delegation *delegation;
2442
2443 if (can_open_cached(data->state, data->o_arg.fmode,
2444 data->o_arg.open_flags, claim))
2445 goto out_no_action;
2446 rcu_read_lock();
2447 delegation = nfs4_get_valid_delegation(data->state->inode);
2448 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2449 goto unlock_no_action;
2450 rcu_read_unlock();
2451 }
2452 /* Update client id. */
2453 data->o_arg.clientid = clp->cl_clientid;
2454 switch (claim) {
2455 default:
2456 break;
2457 case NFS4_OPEN_CLAIM_PREVIOUS:
2458 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2459 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2460 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2461 fallthrough;
2462 case NFS4_OPEN_CLAIM_FH:
2463 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2464 }
2465 data->timestamp = jiffies;
2466 if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2467 &data->o_arg.seq_args,
2468 &data->o_res.seq_res,
2469 task) != 0)
2470 nfs_release_seqid(data->o_arg.seqid);
2471
2472 /* Set the create mode (note dependency on the session type) */
2473 data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2474 if (data->o_arg.open_flags & O_EXCL) {
2475 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2476 if (clp->cl_mvops->minor_version == 0) {
2477 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2478 /* don't put an ACCESS op in OPEN compound if O_EXCL,
2479 * because ACCESS will return permission denied for
2480 * all bits until close */
2481 data->o_res.access_request = data->o_arg.access = 0;
2482 } else if (nfs4_has_persistent_session(clp))
2483 data->o_arg.createmode = NFS4_CREATE_GUARDED;
2484 }
2485 return;
2486 unlock_no_action:
2487 trace_nfs4_cached_open(data->state);
2488 rcu_read_unlock();
2489 out_no_action:
2490 task->tk_action = NULL;
2491 out_wait:
2492 nfs4_sequence_done(task, &data->o_res.seq_res);
2493 }
2494
nfs4_open_done(struct rpc_task * task,void * calldata)2495 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2496 {
2497 struct nfs4_opendata *data = calldata;
2498
2499 data->rpc_status = task->tk_status;
2500
2501 if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2502 return;
2503
2504 if (task->tk_status == 0) {
2505 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2506 switch (data->o_res.f_attr->mode & S_IFMT) {
2507 case S_IFREG:
2508 break;
2509 case S_IFLNK:
2510 data->rpc_status = -ELOOP;
2511 break;
2512 case S_IFDIR:
2513 data->rpc_status = -EISDIR;
2514 break;
2515 default:
2516 data->rpc_status = -ENOTDIR;
2517 }
2518 }
2519 renew_lease(data->o_res.server, data->timestamp);
2520 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2521 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2522 }
2523 data->rpc_done = true;
2524 }
2525
nfs4_open_release(void * calldata)2526 static void nfs4_open_release(void *calldata)
2527 {
2528 struct nfs4_opendata *data = calldata;
2529 struct nfs4_state *state = NULL;
2530
2531 /* If this request hasn't been cancelled, do nothing */
2532 if (!data->cancelled)
2533 goto out_free;
2534 /* In case of error, no cleanup! */
2535 if (data->rpc_status != 0 || !data->rpc_done)
2536 goto out_free;
2537 /* In case we need an open_confirm, no cleanup! */
2538 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2539 goto out_free;
2540 state = nfs4_opendata_to_nfs4_state(data);
2541 if (!IS_ERR(state))
2542 nfs4_close_state(state, data->o_arg.fmode);
2543 out_free:
2544 nfs4_opendata_put(data);
2545 }
2546
2547 static const struct rpc_call_ops nfs4_open_ops = {
2548 .rpc_call_prepare = nfs4_open_prepare,
2549 .rpc_call_done = nfs4_open_done,
2550 .rpc_release = nfs4_open_release,
2551 };
2552
nfs4_run_open_task(struct nfs4_opendata * data,struct nfs_open_context * ctx)2553 static int nfs4_run_open_task(struct nfs4_opendata *data,
2554 struct nfs_open_context *ctx)
2555 {
2556 struct inode *dir = d_inode(data->dir);
2557 struct nfs_server *server = NFS_SERVER(dir);
2558 struct nfs_openargs *o_arg = &data->o_arg;
2559 struct nfs_openres *o_res = &data->o_res;
2560 struct rpc_task *task;
2561 struct rpc_message msg = {
2562 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2563 .rpc_argp = o_arg,
2564 .rpc_resp = o_res,
2565 .rpc_cred = data->owner->so_cred,
2566 };
2567 struct rpc_task_setup task_setup_data = {
2568 .rpc_client = server->client,
2569 .rpc_message = &msg,
2570 .callback_ops = &nfs4_open_ops,
2571 .callback_data = data,
2572 .workqueue = nfsiod_workqueue,
2573 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2574 };
2575 int status;
2576
2577 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
2578 task_setup_data.flags |= RPC_TASK_MOVEABLE;
2579
2580 kref_get(&data->kref);
2581 data->rpc_done = false;
2582 data->rpc_status = 0;
2583 data->cancelled = false;
2584 data->is_recover = false;
2585 if (!ctx) {
2586 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2587 data->is_recover = true;
2588 task_setup_data.flags |= RPC_TASK_TIMEOUT;
2589 } else {
2590 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2591 pnfs_lgopen_prepare(data, ctx);
2592 }
2593 task = rpc_run_task(&task_setup_data);
2594 if (IS_ERR(task))
2595 return PTR_ERR(task);
2596 status = rpc_wait_for_completion_task(task);
2597 if (status != 0) {
2598 data->cancelled = true;
2599 smp_wmb();
2600 } else
2601 status = data->rpc_status;
2602 rpc_put_task(task);
2603
2604 return status;
2605 }
2606
_nfs4_recover_proc_open(struct nfs4_opendata * data)2607 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2608 {
2609 struct inode *dir = d_inode(data->dir);
2610 struct nfs_openres *o_res = &data->o_res;
2611 int status;
2612
2613 status = nfs4_run_open_task(data, NULL);
2614 if (status != 0 || !data->rpc_done)
2615 return status;
2616
2617 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2618
2619 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2620 status = _nfs4_proc_open_confirm(data);
2621
2622 return status;
2623 }
2624
2625 /*
2626 * Additional permission checks in order to distinguish between an
2627 * open for read, and an open for execute. This works around the
2628 * fact that NFSv4 OPEN treats read and execute permissions as being
2629 * the same.
2630 * Note that in the non-execute case, we want to turn off permission
2631 * checking if we just created a new file (POSIX open() semantics).
2632 */
nfs4_opendata_access(const struct cred * cred,struct nfs4_opendata * opendata,struct nfs4_state * state,fmode_t fmode)2633 static int nfs4_opendata_access(const struct cred *cred,
2634 struct nfs4_opendata *opendata,
2635 struct nfs4_state *state, fmode_t fmode)
2636 {
2637 struct nfs_access_entry cache;
2638 u32 mask, flags;
2639
2640 /* access call failed or for some reason the server doesn't
2641 * support any access modes -- defer access call until later */
2642 if (opendata->o_res.access_supported == 0)
2643 return 0;
2644
2645 mask = 0;
2646 if (fmode & FMODE_EXEC) {
2647 /* ONLY check for exec rights */
2648 if (S_ISDIR(state->inode->i_mode))
2649 mask = NFS4_ACCESS_LOOKUP;
2650 else
2651 mask = NFS4_ACCESS_EXECUTE;
2652 } else if ((fmode & FMODE_READ) && !opendata->file_created)
2653 mask = NFS4_ACCESS_READ;
2654
2655 nfs_access_set_mask(&cache, opendata->o_res.access_result);
2656 nfs_access_add_cache(state->inode, &cache, cred);
2657
2658 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2659 if ((mask & ~cache.mask & flags) == 0)
2660 return 0;
2661
2662 return -EACCES;
2663 }
2664
2665 /*
2666 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2667 */
_nfs4_proc_open(struct nfs4_opendata * data,struct nfs_open_context * ctx)2668 static int _nfs4_proc_open(struct nfs4_opendata *data,
2669 struct nfs_open_context *ctx)
2670 {
2671 struct inode *dir = d_inode(data->dir);
2672 struct nfs_server *server = NFS_SERVER(dir);
2673 struct nfs_openargs *o_arg = &data->o_arg;
2674 struct nfs_openres *o_res = &data->o_res;
2675 int status;
2676
2677 status = nfs4_run_open_task(data, ctx);
2678 if (!data->rpc_done)
2679 return status;
2680 if (status != 0) {
2681 if (status == -NFS4ERR_BADNAME &&
2682 !(o_arg->open_flags & O_CREAT))
2683 return -ENOENT;
2684 return status;
2685 }
2686
2687 nfs_fattr_map_and_free_names(server, &data->f_attr);
2688
2689 if (o_arg->open_flags & O_CREAT) {
2690 if (o_arg->open_flags & O_EXCL)
2691 data->file_created = true;
2692 else if (o_res->cinfo.before != o_res->cinfo.after)
2693 data->file_created = true;
2694 if (data->file_created ||
2695 inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2696 nfs4_update_changeattr(dir, &o_res->cinfo,
2697 o_res->f_attr->time_start,
2698 NFS_INO_INVALID_DATA);
2699 }
2700 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2701 server->caps &= ~NFS_CAP_POSIX_LOCK;
2702 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2703 status = _nfs4_proc_open_confirm(data);
2704 if (status != 0)
2705 return status;
2706 }
2707 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2708 struct nfs_fh *fh = &o_res->fh;
2709
2710 nfs4_sequence_free_slot(&o_res->seq_res);
2711 if (o_arg->claim == NFS4_OPEN_CLAIM_FH)
2712 fh = NFS_FH(d_inode(data->dentry));
2713 nfs4_proc_getattr(server, fh, o_res->f_attr, NULL);
2714 }
2715 return 0;
2716 }
2717
2718 /*
2719 * OPEN_EXPIRED:
2720 * reclaim state on the server after a network partition.
2721 * Assumes caller holds the appropriate lock
2722 */
_nfs4_open_expired(struct nfs_open_context * ctx,struct nfs4_state * state)2723 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2724 {
2725 struct nfs4_opendata *opendata;
2726 int ret;
2727
2728 opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH);
2729 if (IS_ERR(opendata))
2730 return PTR_ERR(opendata);
2731 /*
2732 * We're not recovering a delegation, so ask for no delegation.
2733 * Otherwise the recovery thread could deadlock with an outstanding
2734 * delegation return.
2735 */
2736 opendata->o_arg.open_flags = O_DIRECT;
2737 ret = nfs4_open_recover(opendata, state);
2738 if (ret == -ESTALE)
2739 d_drop(ctx->dentry);
2740 nfs4_opendata_put(opendata);
2741 return ret;
2742 }
2743
nfs4_do_open_expired(struct nfs_open_context * ctx,struct nfs4_state * state)2744 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2745 {
2746 struct nfs_server *server = NFS_SERVER(state->inode);
2747 struct nfs4_exception exception = { };
2748 int err;
2749
2750 do {
2751 err = _nfs4_open_expired(ctx, state);
2752 trace_nfs4_open_expired(ctx, 0, err);
2753 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2754 continue;
2755 switch (err) {
2756 default:
2757 goto out;
2758 case -NFS4ERR_GRACE:
2759 case -NFS4ERR_DELAY:
2760 nfs4_handle_exception(server, err, &exception);
2761 err = 0;
2762 }
2763 } while (exception.retry);
2764 out:
2765 return err;
2766 }
2767
nfs4_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)2768 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2769 {
2770 struct nfs_open_context *ctx;
2771 int ret;
2772
2773 ctx = nfs4_state_find_open_context(state);
2774 if (IS_ERR(ctx))
2775 return -EAGAIN;
2776 ret = nfs4_do_open_expired(ctx, state);
2777 put_nfs_open_context(ctx);
2778 return ret;
2779 }
2780
nfs_finish_clear_delegation_stateid(struct nfs4_state * state,const nfs4_stateid * stateid)2781 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2782 const nfs4_stateid *stateid)
2783 {
2784 nfs_remove_bad_delegation(state->inode, stateid);
2785 nfs_state_clear_delegation(state);
2786 }
2787
nfs40_clear_delegation_stateid(struct nfs4_state * state)2788 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2789 {
2790 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2791 nfs_finish_clear_delegation_stateid(state, NULL);
2792 }
2793
nfs40_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)2794 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2795 {
2796 /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2797 nfs40_clear_delegation_stateid(state);
2798 nfs_state_clear_open_state_flags(state);
2799 return nfs4_open_expired(sp, state);
2800 }
2801
nfs40_test_and_free_expired_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)2802 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2803 nfs4_stateid *stateid,
2804 const struct cred *cred)
2805 {
2806 return -NFS4ERR_BAD_STATEID;
2807 }
2808
2809 #if defined(CONFIG_NFS_V4_1)
nfs41_test_and_free_expired_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)2810 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2811 nfs4_stateid *stateid,
2812 const struct cred *cred)
2813 {
2814 int status;
2815
2816 switch (stateid->type) {
2817 default:
2818 break;
2819 case NFS4_INVALID_STATEID_TYPE:
2820 case NFS4_SPECIAL_STATEID_TYPE:
2821 return -NFS4ERR_BAD_STATEID;
2822 case NFS4_REVOKED_STATEID_TYPE:
2823 goto out_free;
2824 }
2825
2826 status = nfs41_test_stateid(server, stateid, cred);
2827 switch (status) {
2828 case -NFS4ERR_EXPIRED:
2829 case -NFS4ERR_ADMIN_REVOKED:
2830 case -NFS4ERR_DELEG_REVOKED:
2831 break;
2832 default:
2833 return status;
2834 }
2835 out_free:
2836 /* Ack the revoked state to the server */
2837 nfs41_free_stateid(server, stateid, cred, true);
2838 return -NFS4ERR_EXPIRED;
2839 }
2840
nfs41_check_delegation_stateid(struct nfs4_state * state)2841 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2842 {
2843 struct nfs_server *server = NFS_SERVER(state->inode);
2844 nfs4_stateid stateid;
2845 struct nfs_delegation *delegation;
2846 const struct cred *cred = NULL;
2847 int status, ret = NFS_OK;
2848
2849 /* Get the delegation credential for use by test/free_stateid */
2850 rcu_read_lock();
2851 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2852 if (delegation == NULL) {
2853 rcu_read_unlock();
2854 nfs_state_clear_delegation(state);
2855 return NFS_OK;
2856 }
2857
2858 spin_lock(&delegation->lock);
2859 nfs4_stateid_copy(&stateid, &delegation->stateid);
2860
2861 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2862 &delegation->flags)) {
2863 spin_unlock(&delegation->lock);
2864 rcu_read_unlock();
2865 return NFS_OK;
2866 }
2867
2868 if (delegation->cred)
2869 cred = get_cred(delegation->cred);
2870 spin_unlock(&delegation->lock);
2871 rcu_read_unlock();
2872 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2873 trace_nfs4_test_delegation_stateid(state, NULL, status);
2874 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2875 nfs_finish_clear_delegation_stateid(state, &stateid);
2876 else
2877 ret = status;
2878
2879 put_cred(cred);
2880 return ret;
2881 }
2882
nfs41_delegation_recover_stateid(struct nfs4_state * state)2883 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2884 {
2885 nfs4_stateid tmp;
2886
2887 if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2888 nfs4_copy_delegation_stateid(state->inode, state->state,
2889 &tmp, NULL) &&
2890 nfs4_stateid_match_other(&state->stateid, &tmp))
2891 nfs_state_set_delegation(state, &tmp, state->state);
2892 else
2893 nfs_state_clear_delegation(state);
2894 }
2895
2896 /**
2897 * nfs41_check_expired_locks - possibly free a lock stateid
2898 *
2899 * @state: NFSv4 state for an inode
2900 *
2901 * Returns NFS_OK if recovery for this stateid is now finished.
2902 * Otherwise a negative NFS4ERR value is returned.
2903 */
nfs41_check_expired_locks(struct nfs4_state * state)2904 static int nfs41_check_expired_locks(struct nfs4_state *state)
2905 {
2906 int status, ret = NFS_OK;
2907 struct nfs4_lock_state *lsp, *prev = NULL;
2908 struct nfs_server *server = NFS_SERVER(state->inode);
2909
2910 if (!test_bit(LK_STATE_IN_USE, &state->flags))
2911 goto out;
2912
2913 spin_lock(&state->state_lock);
2914 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2915 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2916 const struct cred *cred = lsp->ls_state->owner->so_cred;
2917
2918 refcount_inc(&lsp->ls_count);
2919 spin_unlock(&state->state_lock);
2920
2921 nfs4_put_lock_state(prev);
2922 prev = lsp;
2923
2924 status = nfs41_test_and_free_expired_stateid(server,
2925 &lsp->ls_stateid,
2926 cred);
2927 trace_nfs4_test_lock_stateid(state, lsp, status);
2928 if (status == -NFS4ERR_EXPIRED ||
2929 status == -NFS4ERR_BAD_STATEID) {
2930 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2931 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2932 if (!recover_lost_locks)
2933 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2934 } else if (status != NFS_OK) {
2935 ret = status;
2936 nfs4_put_lock_state(prev);
2937 goto out;
2938 }
2939 spin_lock(&state->state_lock);
2940 }
2941 }
2942 spin_unlock(&state->state_lock);
2943 nfs4_put_lock_state(prev);
2944 out:
2945 return ret;
2946 }
2947
2948 /**
2949 * nfs41_check_open_stateid - possibly free an open stateid
2950 *
2951 * @state: NFSv4 state for an inode
2952 *
2953 * Returns NFS_OK if recovery for this stateid is now finished.
2954 * Otherwise a negative NFS4ERR value is returned.
2955 */
nfs41_check_open_stateid(struct nfs4_state * state)2956 static int nfs41_check_open_stateid(struct nfs4_state *state)
2957 {
2958 struct nfs_server *server = NFS_SERVER(state->inode);
2959 nfs4_stateid *stateid = &state->open_stateid;
2960 const struct cred *cred = state->owner->so_cred;
2961 int status;
2962
2963 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
2964 return -NFS4ERR_BAD_STATEID;
2965 status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2966 trace_nfs4_test_open_stateid(state, NULL, status);
2967 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2968 nfs_state_clear_open_state_flags(state);
2969 stateid->type = NFS4_INVALID_STATEID_TYPE;
2970 return status;
2971 }
2972 if (nfs_open_stateid_recover_openmode(state))
2973 return -NFS4ERR_OPENMODE;
2974 return NFS_OK;
2975 }
2976
nfs41_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)2977 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2978 {
2979 int status;
2980
2981 status = nfs41_check_delegation_stateid(state);
2982 if (status != NFS_OK)
2983 return status;
2984 nfs41_delegation_recover_stateid(state);
2985
2986 status = nfs41_check_expired_locks(state);
2987 if (status != NFS_OK)
2988 return status;
2989 status = nfs41_check_open_stateid(state);
2990 if (status != NFS_OK)
2991 status = nfs4_open_expired(sp, state);
2992 return status;
2993 }
2994 #endif
2995
2996 /*
2997 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2998 * fields corresponding to attributes that were used to store the verifier.
2999 * Make sure we clobber those fields in the later setattr call
3000 */
nfs4_exclusive_attrset(struct nfs4_opendata * opendata,struct iattr * sattr,struct nfs4_label ** label)3001 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
3002 struct iattr *sattr, struct nfs4_label **label)
3003 {
3004 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
3005 __u32 attrset[3];
3006 unsigned ret;
3007 unsigned i;
3008
3009 for (i = 0; i < ARRAY_SIZE(attrset); i++) {
3010 attrset[i] = opendata->o_res.attrset[i];
3011 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
3012 attrset[i] &= ~bitmask[i];
3013 }
3014
3015 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
3016 sattr->ia_valid : 0;
3017
3018 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
3019 if (sattr->ia_valid & ATTR_ATIME_SET)
3020 ret |= ATTR_ATIME_SET;
3021 else
3022 ret |= ATTR_ATIME;
3023 }
3024
3025 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
3026 if (sattr->ia_valid & ATTR_MTIME_SET)
3027 ret |= ATTR_MTIME_SET;
3028 else
3029 ret |= ATTR_MTIME;
3030 }
3031
3032 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
3033 *label = NULL;
3034 return ret;
3035 }
3036
_nfs4_open_and_get_state(struct nfs4_opendata * opendata,struct nfs_open_context * ctx)3037 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
3038 struct nfs_open_context *ctx)
3039 {
3040 struct nfs4_state_owner *sp = opendata->owner;
3041 struct nfs_server *server = sp->so_server;
3042 struct dentry *dentry;
3043 struct nfs4_state *state;
3044 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
3045 struct inode *dir = d_inode(opendata->dir);
3046 unsigned long dir_verifier;
3047 unsigned int seq;
3048 int ret;
3049
3050 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
3051 dir_verifier = nfs_save_change_attribute(dir);
3052
3053 ret = _nfs4_proc_open(opendata, ctx);
3054 if (ret != 0)
3055 goto out;
3056
3057 state = _nfs4_opendata_to_nfs4_state(opendata);
3058 ret = PTR_ERR(state);
3059 if (IS_ERR(state))
3060 goto out;
3061 ctx->state = state;
3062 if (server->caps & NFS_CAP_POSIX_LOCK)
3063 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
3064 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3065 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3066 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED)
3067 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags);
3068
3069 dentry = opendata->dentry;
3070 if (d_really_is_negative(dentry)) {
3071 struct dentry *alias;
3072 d_drop(dentry);
3073 alias = d_exact_alias(dentry, state->inode);
3074 if (!alias)
3075 alias = d_splice_alias(igrab(state->inode), dentry);
3076 /* d_splice_alias() can't fail here - it's a non-directory */
3077 if (alias) {
3078 dput(ctx->dentry);
3079 ctx->dentry = dentry = alias;
3080 }
3081 }
3082
3083 switch(opendata->o_arg.claim) {
3084 default:
3085 break;
3086 case NFS4_OPEN_CLAIM_NULL:
3087 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3088 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3089 if (!opendata->rpc_done)
3090 break;
3091 if (opendata->o_res.delegation_type != 0)
3092 dir_verifier = nfs_save_change_attribute(dir);
3093 nfs_set_verifier(dentry, dir_verifier);
3094 }
3095
3096 /* Parse layoutget results before we check for access */
3097 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3098
3099 ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode);
3100 if (ret != 0)
3101 goto out;
3102
3103 if (d_inode(dentry) == state->inode) {
3104 nfs_inode_attach_open_context(ctx);
3105 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
3106 nfs4_schedule_stateid_recovery(server, state);
3107 }
3108
3109 out:
3110 if (!opendata->cancelled) {
3111 if (opendata->lgp) {
3112 nfs4_lgopen_release(opendata->lgp);
3113 opendata->lgp = NULL;
3114 }
3115 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3116 }
3117 return ret;
3118 }
3119
3120 /*
3121 * Returns a referenced nfs4_state
3122 */
_nfs4_do_open(struct inode * dir,struct nfs_open_context * ctx,int flags,const struct nfs4_open_createattrs * c,int * opened)3123 static int _nfs4_do_open(struct inode *dir,
3124 struct nfs_open_context *ctx,
3125 int flags,
3126 const struct nfs4_open_createattrs *c,
3127 int *opened)
3128 {
3129 struct nfs4_state_owner *sp;
3130 struct nfs4_state *state = NULL;
3131 struct nfs_server *server = NFS_SERVER(dir);
3132 struct nfs4_opendata *opendata;
3133 struct dentry *dentry = ctx->dentry;
3134 const struct cred *cred = ctx->cred;
3135 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3136 fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3137 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3138 struct iattr *sattr = c->sattr;
3139 struct nfs4_label *label = c->label;
3140 int status;
3141
3142 /* Protect against reboot recovery conflicts */
3143 status = -ENOMEM;
3144 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3145 if (sp == NULL) {
3146 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3147 goto out_err;
3148 }
3149 status = nfs4_client_recover_expired_lease(server->nfs_client);
3150 if (status != 0)
3151 goto err_put_state_owner;
3152 if (d_really_is_positive(dentry))
3153 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3154 status = -ENOMEM;
3155 if (d_really_is_positive(dentry))
3156 claim = NFS4_OPEN_CLAIM_FH;
3157 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3158 c, claim, GFP_KERNEL);
3159 if (opendata == NULL)
3160 goto err_put_state_owner;
3161
3162 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3163 if (!opendata->f_attr.mdsthreshold) {
3164 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3165 if (!opendata->f_attr.mdsthreshold)
3166 goto err_opendata_put;
3167 }
3168 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3169 }
3170 if (d_really_is_positive(dentry))
3171 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3172
3173 status = _nfs4_open_and_get_state(opendata, ctx);
3174 if (status != 0)
3175 goto err_opendata_put;
3176 state = ctx->state;
3177
3178 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3179 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3180 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3181 /*
3182 * send create attributes which was not set by open
3183 * with an extra setattr.
3184 */
3185 if (attrs || label) {
3186 unsigned ia_old = sattr->ia_valid;
3187
3188 sattr->ia_valid = attrs;
3189 nfs_fattr_init(opendata->o_res.f_attr);
3190 status = nfs4_do_setattr(state->inode, cred,
3191 opendata->o_res.f_attr, sattr,
3192 ctx, label);
3193 if (status == 0) {
3194 nfs_setattr_update_inode(state->inode, sattr,
3195 opendata->o_res.f_attr);
3196 nfs_setsecurity(state->inode, opendata->o_res.f_attr);
3197 }
3198 sattr->ia_valid = ia_old;
3199 }
3200 }
3201 if (opened && opendata->file_created)
3202 *opened = 1;
3203
3204 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3205 *ctx_th = opendata->f_attr.mdsthreshold;
3206 opendata->f_attr.mdsthreshold = NULL;
3207 }
3208
3209 nfs4_opendata_put(opendata);
3210 nfs4_put_state_owner(sp);
3211 return 0;
3212 err_opendata_put:
3213 nfs4_opendata_put(opendata);
3214 err_put_state_owner:
3215 nfs4_put_state_owner(sp);
3216 out_err:
3217 return status;
3218 }
3219
3220
nfs4_do_open(struct inode * dir,struct nfs_open_context * ctx,int flags,struct iattr * sattr,struct nfs4_label * label,int * opened)3221 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3222 struct nfs_open_context *ctx,
3223 int flags,
3224 struct iattr *sattr,
3225 struct nfs4_label *label,
3226 int *opened)
3227 {
3228 struct nfs_server *server = NFS_SERVER(dir);
3229 struct nfs4_exception exception = {
3230 .interruptible = true,
3231 };
3232 struct nfs4_state *res;
3233 struct nfs4_open_createattrs c = {
3234 .label = label,
3235 .sattr = sattr,
3236 .verf = {
3237 [0] = (__u32)jiffies,
3238 [1] = (__u32)current->pid,
3239 },
3240 };
3241 int status;
3242
3243 do {
3244 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3245 res = ctx->state;
3246 trace_nfs4_open_file(ctx, flags, status);
3247 if (status == 0)
3248 break;
3249 /* NOTE: BAD_SEQID means the server and client disagree about the
3250 * book-keeping w.r.t. state-changing operations
3251 * (OPEN/CLOSE/LOCK/LOCKU...)
3252 * It is actually a sign of a bug on the client or on the server.
3253 *
3254 * If we receive a BAD_SEQID error in the particular case of
3255 * doing an OPEN, we assume that nfs_increment_open_seqid() will
3256 * have unhashed the old state_owner for us, and that we can
3257 * therefore safely retry using a new one. We should still warn
3258 * the user though...
3259 */
3260 if (status == -NFS4ERR_BAD_SEQID) {
3261 pr_warn_ratelimited("NFS: v4 server %s "
3262 " returned a bad sequence-id error!\n",
3263 NFS_SERVER(dir)->nfs_client->cl_hostname);
3264 exception.retry = 1;
3265 continue;
3266 }
3267 /*
3268 * BAD_STATEID on OPEN means that the server cancelled our
3269 * state before it received the OPEN_CONFIRM.
3270 * Recover by retrying the request as per the discussion
3271 * on Page 181 of RFC3530.
3272 */
3273 if (status == -NFS4ERR_BAD_STATEID) {
3274 exception.retry = 1;
3275 continue;
3276 }
3277 if (status == -NFS4ERR_EXPIRED) {
3278 nfs4_schedule_lease_recovery(server->nfs_client);
3279 exception.retry = 1;
3280 continue;
3281 }
3282 if (status == -EAGAIN) {
3283 /* We must have found a delegation */
3284 exception.retry = 1;
3285 continue;
3286 }
3287 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3288 continue;
3289 res = ERR_PTR(nfs4_handle_exception(server,
3290 status, &exception));
3291 } while (exception.retry);
3292 return res;
3293 }
3294
_nfs4_do_setattr(struct inode * inode,struct nfs_setattrargs * arg,struct nfs_setattrres * res,const struct cred * cred,struct nfs_open_context * ctx)3295 static int _nfs4_do_setattr(struct inode *inode,
3296 struct nfs_setattrargs *arg,
3297 struct nfs_setattrres *res,
3298 const struct cred *cred,
3299 struct nfs_open_context *ctx)
3300 {
3301 struct nfs_server *server = NFS_SERVER(inode);
3302 struct rpc_message msg = {
3303 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3304 .rpc_argp = arg,
3305 .rpc_resp = res,
3306 .rpc_cred = cred,
3307 };
3308 const struct cred *delegation_cred = NULL;
3309 unsigned long timestamp = jiffies;
3310 bool truncate;
3311 int status;
3312
3313 nfs_fattr_init(res->fattr);
3314
3315 /* Servers should only apply open mode checks for file size changes */
3316 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3317 if (!truncate) {
3318 nfs4_inode_make_writeable(inode);
3319 goto zero_stateid;
3320 }
3321
3322 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3323 /* Use that stateid */
3324 } else if (ctx != NULL && ctx->state) {
3325 struct nfs_lock_context *l_ctx;
3326 if (!nfs4_valid_open_stateid(ctx->state))
3327 return -EBADF;
3328 l_ctx = nfs_get_lock_context(ctx);
3329 if (IS_ERR(l_ctx))
3330 return PTR_ERR(l_ctx);
3331 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3332 &arg->stateid, &delegation_cred);
3333 nfs_put_lock_context(l_ctx);
3334 if (status == -EIO)
3335 return -EBADF;
3336 else if (status == -EAGAIN)
3337 goto zero_stateid;
3338 } else {
3339 zero_stateid:
3340 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3341 }
3342 if (delegation_cred)
3343 msg.rpc_cred = delegation_cred;
3344
3345 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3346
3347 put_cred(delegation_cred);
3348 if (status == 0 && ctx != NULL)
3349 renew_lease(server, timestamp);
3350 trace_nfs4_setattr(inode, &arg->stateid, status);
3351 return status;
3352 }
3353
nfs4_do_setattr(struct inode * inode,const struct cred * cred,struct nfs_fattr * fattr,struct iattr * sattr,struct nfs_open_context * ctx,struct nfs4_label * ilabel)3354 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3355 struct nfs_fattr *fattr, struct iattr *sattr,
3356 struct nfs_open_context *ctx, struct nfs4_label *ilabel)
3357 {
3358 struct nfs_server *server = NFS_SERVER(inode);
3359 __u32 bitmask[NFS4_BITMASK_SZ];
3360 struct nfs4_state *state = ctx ? ctx->state : NULL;
3361 struct nfs_setattrargs arg = {
3362 .fh = NFS_FH(inode),
3363 .iap = sattr,
3364 .server = server,
3365 .bitmask = bitmask,
3366 .label = ilabel,
3367 };
3368 struct nfs_setattrres res = {
3369 .fattr = fattr,
3370 .server = server,
3371 };
3372 struct nfs4_exception exception = {
3373 .state = state,
3374 .inode = inode,
3375 .stateid = &arg.stateid,
3376 };
3377 unsigned long adjust_flags = NFS_INO_INVALID_CHANGE;
3378 int err;
3379
3380 if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID))
3381 adjust_flags |= NFS_INO_INVALID_MODE;
3382 if (sattr->ia_valid & (ATTR_UID | ATTR_GID))
3383 adjust_flags |= NFS_INO_INVALID_OTHER;
3384
3385 do {
3386 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label),
3387 inode, adjust_flags);
3388
3389 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3390 switch (err) {
3391 case -NFS4ERR_OPENMODE:
3392 if (!(sattr->ia_valid & ATTR_SIZE)) {
3393 pr_warn_once("NFSv4: server %s is incorrectly "
3394 "applying open mode checks to "
3395 "a SETATTR that is not "
3396 "changing file size.\n",
3397 server->nfs_client->cl_hostname);
3398 }
3399 if (state && !(state->state & FMODE_WRITE)) {
3400 err = -EBADF;
3401 if (sattr->ia_valid & ATTR_OPEN)
3402 err = -EACCES;
3403 goto out;
3404 }
3405 }
3406 err = nfs4_handle_exception(server, err, &exception);
3407 } while (exception.retry);
3408 out:
3409 return err;
3410 }
3411
3412 static bool
nfs4_wait_on_layoutreturn(struct inode * inode,struct rpc_task * task)3413 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3414 {
3415 if (inode == NULL || !nfs_have_layout(inode))
3416 return false;
3417
3418 return pnfs_wait_on_layoutreturn(inode, task);
3419 }
3420
3421 /*
3422 * Update the seqid of an open stateid
3423 */
nfs4_sync_open_stateid(nfs4_stateid * dst,struct nfs4_state * state)3424 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3425 struct nfs4_state *state)
3426 {
3427 __be32 seqid_open;
3428 u32 dst_seqid;
3429 int seq;
3430
3431 for (;;) {
3432 if (!nfs4_valid_open_stateid(state))
3433 break;
3434 seq = read_seqbegin(&state->seqlock);
3435 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3436 nfs4_stateid_copy(dst, &state->open_stateid);
3437 if (read_seqretry(&state->seqlock, seq))
3438 continue;
3439 break;
3440 }
3441 seqid_open = state->open_stateid.seqid;
3442 if (read_seqretry(&state->seqlock, seq))
3443 continue;
3444
3445 dst_seqid = be32_to_cpu(dst->seqid);
3446 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3447 dst->seqid = seqid_open;
3448 break;
3449 }
3450 }
3451
3452 /*
3453 * Update the seqid of an open stateid after receiving
3454 * NFS4ERR_OLD_STATEID
3455 */
nfs4_refresh_open_old_stateid(nfs4_stateid * dst,struct nfs4_state * state)3456 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3457 struct nfs4_state *state)
3458 {
3459 __be32 seqid_open;
3460 u32 dst_seqid;
3461 bool ret;
3462 int seq, status = -EAGAIN;
3463 DEFINE_WAIT(wait);
3464
3465 for (;;) {
3466 ret = false;
3467 if (!nfs4_valid_open_stateid(state))
3468 break;
3469 seq = read_seqbegin(&state->seqlock);
3470 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3471 if (read_seqretry(&state->seqlock, seq))
3472 continue;
3473 break;
3474 }
3475
3476 write_seqlock(&state->seqlock);
3477 seqid_open = state->open_stateid.seqid;
3478
3479 dst_seqid = be32_to_cpu(dst->seqid);
3480
3481 /* Did another OPEN bump the state's seqid? try again: */
3482 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) {
3483 dst->seqid = seqid_open;
3484 write_sequnlock(&state->seqlock);
3485 ret = true;
3486 break;
3487 }
3488
3489 /* server says we're behind but we haven't seen the update yet */
3490 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
3491 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
3492 write_sequnlock(&state->seqlock);
3493 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0);
3494
3495 if (fatal_signal_pending(current))
3496 status = -EINTR;
3497 else
3498 if (schedule_timeout(5*HZ) != 0)
3499 status = 0;
3500
3501 finish_wait(&state->waitq, &wait);
3502
3503 if (!status)
3504 continue;
3505 if (status == -EINTR)
3506 break;
3507
3508 /* we slept the whole 5 seconds, we must have lost a seqid */
3509 dst->seqid = cpu_to_be32(dst_seqid + 1);
3510 ret = true;
3511 break;
3512 }
3513
3514 return ret;
3515 }
3516
3517 struct nfs4_closedata {
3518 struct inode *inode;
3519 struct nfs4_state *state;
3520 struct nfs_closeargs arg;
3521 struct nfs_closeres res;
3522 struct {
3523 struct nfs4_layoutreturn_args arg;
3524 struct nfs4_layoutreturn_res res;
3525 struct nfs4_xdr_opaque_data ld_private;
3526 u32 roc_barrier;
3527 bool roc;
3528 } lr;
3529 struct nfs_fattr fattr;
3530 unsigned long timestamp;
3531 };
3532
nfs4_free_closedata(void * data)3533 static void nfs4_free_closedata(void *data)
3534 {
3535 struct nfs4_closedata *calldata = data;
3536 struct nfs4_state_owner *sp = calldata->state->owner;
3537 struct super_block *sb = calldata->state->inode->i_sb;
3538
3539 if (calldata->lr.roc)
3540 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3541 calldata->res.lr_ret);
3542 nfs4_put_open_state(calldata->state);
3543 nfs_free_seqid(calldata->arg.seqid);
3544 nfs4_put_state_owner(sp);
3545 nfs_sb_deactive(sb);
3546 kfree(calldata);
3547 }
3548
nfs4_close_done(struct rpc_task * task,void * data)3549 static void nfs4_close_done(struct rpc_task *task, void *data)
3550 {
3551 struct nfs4_closedata *calldata = data;
3552 struct nfs4_state *state = calldata->state;
3553 struct nfs_server *server = NFS_SERVER(calldata->inode);
3554 nfs4_stateid *res_stateid = NULL;
3555 struct nfs4_exception exception = {
3556 .state = state,
3557 .inode = calldata->inode,
3558 .stateid = &calldata->arg.stateid,
3559 };
3560
3561 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3562 return;
3563 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3564
3565 /* Handle Layoutreturn errors */
3566 if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res,
3567 &calldata->res.lr_ret) == -EAGAIN)
3568 goto out_restart;
3569
3570 /* hmm. we are done with the inode, and in the process of freeing
3571 * the state_owner. we keep this around to process errors
3572 */
3573 switch (task->tk_status) {
3574 case 0:
3575 res_stateid = &calldata->res.stateid;
3576 renew_lease(server, calldata->timestamp);
3577 break;
3578 case -NFS4ERR_ACCESS:
3579 if (calldata->arg.bitmask != NULL) {
3580 calldata->arg.bitmask = NULL;
3581 calldata->res.fattr = NULL;
3582 goto out_restart;
3583
3584 }
3585 break;
3586 case -NFS4ERR_OLD_STATEID:
3587 /* Did we race with OPEN? */
3588 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3589 state))
3590 goto out_restart;
3591 goto out_release;
3592 case -NFS4ERR_ADMIN_REVOKED:
3593 case -NFS4ERR_STALE_STATEID:
3594 case -NFS4ERR_EXPIRED:
3595 nfs4_free_revoked_stateid(server,
3596 &calldata->arg.stateid,
3597 task->tk_msg.rpc_cred);
3598 fallthrough;
3599 case -NFS4ERR_BAD_STATEID:
3600 if (calldata->arg.fmode == 0)
3601 break;
3602 fallthrough;
3603 default:
3604 task->tk_status = nfs4_async_handle_exception(task,
3605 server, task->tk_status, &exception);
3606 if (exception.retry)
3607 goto out_restart;
3608 }
3609 nfs_clear_open_stateid(state, &calldata->arg.stateid,
3610 res_stateid, calldata->arg.fmode);
3611 out_release:
3612 task->tk_status = 0;
3613 nfs_release_seqid(calldata->arg.seqid);
3614 nfs_refresh_inode(calldata->inode, &calldata->fattr);
3615 dprintk("%s: ret = %d\n", __func__, task->tk_status);
3616 return;
3617 out_restart:
3618 task->tk_status = 0;
3619 rpc_restart_call_prepare(task);
3620 goto out_release;
3621 }
3622
nfs4_close_prepare(struct rpc_task * task,void * data)3623 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3624 {
3625 struct nfs4_closedata *calldata = data;
3626 struct nfs4_state *state = calldata->state;
3627 struct inode *inode = calldata->inode;
3628 struct nfs_server *server = NFS_SERVER(inode);
3629 struct pnfs_layout_hdr *lo;
3630 bool is_rdonly, is_wronly, is_rdwr;
3631 int call_close = 0;
3632
3633 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3634 goto out_wait;
3635
3636 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3637 spin_lock(&state->owner->so_lock);
3638 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3639 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3640 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3641 /* Calculate the change in open mode */
3642 calldata->arg.fmode = 0;
3643 if (state->n_rdwr == 0) {
3644 if (state->n_rdonly == 0)
3645 call_close |= is_rdonly;
3646 else if (is_rdonly)
3647 calldata->arg.fmode |= FMODE_READ;
3648 if (state->n_wronly == 0)
3649 call_close |= is_wronly;
3650 else if (is_wronly)
3651 calldata->arg.fmode |= FMODE_WRITE;
3652 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3653 call_close |= is_rdwr;
3654 } else if (is_rdwr)
3655 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3656
3657 nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3658 if (!nfs4_valid_open_stateid(state))
3659 call_close = 0;
3660 spin_unlock(&state->owner->so_lock);
3661
3662 if (!call_close) {
3663 /* Note: exit _without_ calling nfs4_close_done */
3664 goto out_no_action;
3665 }
3666
3667 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3668 nfs_release_seqid(calldata->arg.seqid);
3669 goto out_wait;
3670 }
3671
3672 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3673 if (lo && !pnfs_layout_is_valid(lo)) {
3674 calldata->arg.lr_args = NULL;
3675 calldata->res.lr_res = NULL;
3676 }
3677
3678 if (calldata->arg.fmode == 0)
3679 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3680
3681 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3682 /* Close-to-open cache consistency revalidation */
3683 if (!nfs4_have_delegation(inode, FMODE_READ)) {
3684 nfs4_bitmask_set(calldata->arg.bitmask_store,
3685 server->cache_consistency_bitmask,
3686 inode, 0);
3687 calldata->arg.bitmask = calldata->arg.bitmask_store;
3688 } else
3689 calldata->arg.bitmask = NULL;
3690 }
3691
3692 calldata->arg.share_access =
3693 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3694 calldata->arg.fmode, 0);
3695
3696 if (calldata->res.fattr == NULL)
3697 calldata->arg.bitmask = NULL;
3698 else if (calldata->arg.bitmask == NULL)
3699 calldata->res.fattr = NULL;
3700 calldata->timestamp = jiffies;
3701 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3702 &calldata->arg.seq_args,
3703 &calldata->res.seq_res,
3704 task) != 0)
3705 nfs_release_seqid(calldata->arg.seqid);
3706 return;
3707 out_no_action:
3708 task->tk_action = NULL;
3709 out_wait:
3710 nfs4_sequence_done(task, &calldata->res.seq_res);
3711 }
3712
3713 static const struct rpc_call_ops nfs4_close_ops = {
3714 .rpc_call_prepare = nfs4_close_prepare,
3715 .rpc_call_done = nfs4_close_done,
3716 .rpc_release = nfs4_free_closedata,
3717 };
3718
3719 /*
3720 * It is possible for data to be read/written from a mem-mapped file
3721 * after the sys_close call (which hits the vfs layer as a flush).
3722 * This means that we can't safely call nfsv4 close on a file until
3723 * the inode is cleared. This in turn means that we are not good
3724 * NFSv4 citizens - we do not indicate to the server to update the file's
3725 * share state even when we are done with one of the three share
3726 * stateid's in the inode.
3727 *
3728 * NOTE: Caller must be holding the sp->so_owner semaphore!
3729 */
nfs4_do_close(struct nfs4_state * state,gfp_t gfp_mask,int wait)3730 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3731 {
3732 struct nfs_server *server = NFS_SERVER(state->inode);
3733 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3734 struct nfs4_closedata *calldata;
3735 struct nfs4_state_owner *sp = state->owner;
3736 struct rpc_task *task;
3737 struct rpc_message msg = {
3738 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3739 .rpc_cred = state->owner->so_cred,
3740 };
3741 struct rpc_task_setup task_setup_data = {
3742 .rpc_client = server->client,
3743 .rpc_message = &msg,
3744 .callback_ops = &nfs4_close_ops,
3745 .workqueue = nfsiod_workqueue,
3746 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3747 };
3748 int status = -ENOMEM;
3749
3750 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
3751 task_setup_data.flags |= RPC_TASK_MOVEABLE;
3752
3753 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3754 &task_setup_data.rpc_client, &msg);
3755
3756 calldata = kzalloc(sizeof(*calldata), gfp_mask);
3757 if (calldata == NULL)
3758 goto out;
3759 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3760 calldata->inode = state->inode;
3761 calldata->state = state;
3762 calldata->arg.fh = NFS_FH(state->inode);
3763 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3764 goto out_free_calldata;
3765 /* Serialization for the sequence id */
3766 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3767 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3768 if (IS_ERR(calldata->arg.seqid))
3769 goto out_free_calldata;
3770 nfs_fattr_init(&calldata->fattr);
3771 calldata->arg.fmode = 0;
3772 calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3773 calldata->res.fattr = &calldata->fattr;
3774 calldata->res.seqid = calldata->arg.seqid;
3775 calldata->res.server = server;
3776 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3777 calldata->lr.roc = pnfs_roc(state->inode,
3778 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3779 if (calldata->lr.roc) {
3780 calldata->arg.lr_args = &calldata->lr.arg;
3781 calldata->res.lr_res = &calldata->lr.res;
3782 }
3783 nfs_sb_active(calldata->inode->i_sb);
3784
3785 msg.rpc_argp = &calldata->arg;
3786 msg.rpc_resp = &calldata->res;
3787 task_setup_data.callback_data = calldata;
3788 task = rpc_run_task(&task_setup_data);
3789 if (IS_ERR(task))
3790 return PTR_ERR(task);
3791 status = 0;
3792 if (wait)
3793 status = rpc_wait_for_completion_task(task);
3794 rpc_put_task(task);
3795 return status;
3796 out_free_calldata:
3797 kfree(calldata);
3798 out:
3799 nfs4_put_open_state(state);
3800 nfs4_put_state_owner(sp);
3801 return status;
3802 }
3803
3804 static struct inode *
nfs4_atomic_open(struct inode * dir,struct nfs_open_context * ctx,int open_flags,struct iattr * attr,int * opened)3805 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3806 int open_flags, struct iattr *attr, int *opened)
3807 {
3808 struct nfs4_state *state;
3809 struct nfs4_label l, *label;
3810
3811 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3812
3813 /* Protect against concurrent sillydeletes */
3814 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3815
3816 nfs4_label_release_security(label);
3817
3818 if (IS_ERR(state))
3819 return ERR_CAST(state);
3820 return state->inode;
3821 }
3822
nfs4_close_context(struct nfs_open_context * ctx,int is_sync)3823 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3824 {
3825 if (ctx->state == NULL)
3826 return;
3827 if (is_sync)
3828 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3829 else
3830 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3831 }
3832
3833 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3834 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3835 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL)
3836
_nfs4_server_capabilities(struct nfs_server * server,struct nfs_fh * fhandle)3837 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3838 {
3839 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3840 struct nfs4_server_caps_arg args = {
3841 .fhandle = fhandle,
3842 .bitmask = bitmask,
3843 };
3844 struct nfs4_server_caps_res res = {};
3845 struct rpc_message msg = {
3846 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3847 .rpc_argp = &args,
3848 .rpc_resp = &res,
3849 };
3850 int status;
3851 int i;
3852
3853 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3854 FATTR4_WORD0_FH_EXPIRE_TYPE |
3855 FATTR4_WORD0_LINK_SUPPORT |
3856 FATTR4_WORD0_SYMLINK_SUPPORT |
3857 FATTR4_WORD0_ACLSUPPORT |
3858 FATTR4_WORD0_CASE_INSENSITIVE |
3859 FATTR4_WORD0_CASE_PRESERVING;
3860 if (minorversion)
3861 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3862
3863 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3864 if (status == 0) {
3865 /* Sanity check the server answers */
3866 switch (minorversion) {
3867 case 0:
3868 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3869 res.attr_bitmask[2] = 0;
3870 break;
3871 case 1:
3872 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3873 break;
3874 case 2:
3875 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3876 }
3877 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3878 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS |
3879 NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL);
3880 server->fattr_valid = NFS_ATTR_FATTR_V4;
3881 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3882 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3883 server->caps |= NFS_CAP_ACLS;
3884 if (res.has_links != 0)
3885 server->caps |= NFS_CAP_HARDLINKS;
3886 if (res.has_symlinks != 0)
3887 server->caps |= NFS_CAP_SYMLINKS;
3888 if (res.case_insensitive)
3889 server->caps |= NFS_CAP_CASE_INSENSITIVE;
3890 if (res.case_preserving)
3891 server->caps |= NFS_CAP_CASE_PRESERVING;
3892 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3893 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3894 server->caps |= NFS_CAP_SECURITY_LABEL;
3895 #endif
3896 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS)
3897 server->caps |= NFS_CAP_FS_LOCATIONS;
3898 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID))
3899 server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID;
3900 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE))
3901 server->fattr_valid &= ~NFS_ATTR_FATTR_MODE;
3902 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS))
3903 server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK;
3904 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER))
3905 server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER |
3906 NFS_ATTR_FATTR_OWNER_NAME);
3907 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP))
3908 server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP |
3909 NFS_ATTR_FATTR_GROUP_NAME);
3910 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED))
3911 server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED;
3912 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS))
3913 server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME;
3914 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA))
3915 server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME;
3916 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
3917 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
3918 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3919 sizeof(server->attr_bitmask));
3920 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3921
3922 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3923 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3924 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3925 server->cache_consistency_bitmask[2] = 0;
3926
3927 /* Avoid a regression due to buggy server */
3928 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3929 res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3930 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3931 sizeof(server->exclcreat_bitmask));
3932
3933 server->acl_bitmask = res.acl_bitmask;
3934 server->fh_expire_type = res.fh_expire_type;
3935 }
3936
3937 return status;
3938 }
3939
nfs4_server_capabilities(struct nfs_server * server,struct nfs_fh * fhandle)3940 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3941 {
3942 struct nfs4_exception exception = {
3943 .interruptible = true,
3944 };
3945 int err;
3946
3947 nfs4_server_set_init_caps(server);
3948 do {
3949 err = nfs4_handle_exception(server,
3950 _nfs4_server_capabilities(server, fhandle),
3951 &exception);
3952 } while (exception.retry);
3953 return err;
3954 }
3955
test_fs_location_for_trunking(struct nfs4_fs_location * location,struct nfs_client * clp,struct nfs_server * server)3956 static void test_fs_location_for_trunking(struct nfs4_fs_location *location,
3957 struct nfs_client *clp,
3958 struct nfs_server *server)
3959 {
3960 int i;
3961
3962 for (i = 0; i < location->nservers; i++) {
3963 struct nfs4_string *srv_loc = &location->servers[i];
3964 struct sockaddr_storage addr;
3965 size_t addrlen;
3966 struct xprt_create xprt_args = {
3967 .ident = 0,
3968 .net = clp->cl_net,
3969 };
3970 struct nfs4_add_xprt_data xprtdata = {
3971 .clp = clp,
3972 };
3973 struct rpc_add_xprt_test rpcdata = {
3974 .add_xprt_test = clp->cl_mvops->session_trunk,
3975 .data = &xprtdata,
3976 };
3977 char *servername = NULL;
3978
3979 if (!srv_loc->len)
3980 continue;
3981
3982 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len,
3983 &addr, sizeof(addr),
3984 clp->cl_net, server->port);
3985 if (!addrlen)
3986 return;
3987 xprt_args.dstaddr = (struct sockaddr *)&addr;
3988 xprt_args.addrlen = addrlen;
3989 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL);
3990 if (!servername)
3991 return;
3992 memcpy(servername, srv_loc->data, srv_loc->len);
3993 servername[srv_loc->len] = '\0';
3994 xprt_args.servername = servername;
3995
3996 xprtdata.cred = nfs4_get_clid_cred(clp);
3997 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
3998 rpc_clnt_setup_test_and_add_xprt,
3999 &rpcdata);
4000 if (xprtdata.cred)
4001 put_cred(xprtdata.cred);
4002 kfree(servername);
4003 }
4004 }
4005
_is_same_nfs4_pathname(struct nfs4_pathname * path1,struct nfs4_pathname * path2)4006 static bool _is_same_nfs4_pathname(struct nfs4_pathname *path1,
4007 struct nfs4_pathname *path2)
4008 {
4009 int i;
4010
4011 if (path1->ncomponents != path2->ncomponents)
4012 return false;
4013 for (i = 0; i < path1->ncomponents; i++) {
4014 if (path1->components[i].len != path2->components[i].len)
4015 return false;
4016 if (memcmp(path1->components[i].data, path2->components[i].data,
4017 path1->components[i].len))
4018 return false;
4019 }
4020 return true;
4021 }
4022
_nfs4_discover_trunking(struct nfs_server * server,struct nfs_fh * fhandle)4023 static int _nfs4_discover_trunking(struct nfs_server *server,
4024 struct nfs_fh *fhandle)
4025 {
4026 struct nfs4_fs_locations *locations = NULL;
4027 struct page *page;
4028 const struct cred *cred;
4029 struct nfs_client *clp = server->nfs_client;
4030 const struct nfs4_state_maintenance_ops *ops =
4031 clp->cl_mvops->state_renewal_ops;
4032 int status = -ENOMEM, i;
4033
4034 cred = ops->get_state_renewal_cred(clp);
4035 if (cred == NULL) {
4036 cred = nfs4_get_clid_cred(clp);
4037 if (cred == NULL)
4038 return -ENOKEY;
4039 }
4040
4041 page = alloc_page(GFP_KERNEL);
4042 if (!page)
4043 goto out_put_cred;
4044 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4045 if (!locations)
4046 goto out_free;
4047 locations->fattr = nfs_alloc_fattr();
4048 if (!locations->fattr)
4049 goto out_free_2;
4050
4051 status = nfs4_proc_get_locations(server, fhandle, locations, page,
4052 cred);
4053 if (status)
4054 goto out_free_3;
4055
4056 for (i = 0; i < locations->nlocations; i++) {
4057 if (!_is_same_nfs4_pathname(&locations->fs_path,
4058 &locations->locations[i].rootpath))
4059 continue;
4060 test_fs_location_for_trunking(&locations->locations[i], clp,
4061 server);
4062 }
4063 out_free_3:
4064 kfree(locations->fattr);
4065 out_free_2:
4066 kfree(locations);
4067 out_free:
4068 __free_page(page);
4069 out_put_cred:
4070 put_cred(cred);
4071 return status;
4072 }
4073
nfs4_discover_trunking(struct nfs_server * server,struct nfs_fh * fhandle)4074 static int nfs4_discover_trunking(struct nfs_server *server,
4075 struct nfs_fh *fhandle)
4076 {
4077 struct nfs4_exception exception = {
4078 .interruptible = true,
4079 };
4080 struct nfs_client *clp = server->nfs_client;
4081 int err = 0;
4082
4083 if (!nfs4_has_session(clp))
4084 goto out;
4085 do {
4086 err = nfs4_handle_exception(server,
4087 _nfs4_discover_trunking(server, fhandle),
4088 &exception);
4089 } while (exception.retry);
4090 out:
4091 return err;
4092 }
4093
_nfs4_lookup_root(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)4094 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4095 struct nfs_fsinfo *info)
4096 {
4097 u32 bitmask[3];
4098 struct nfs4_lookup_root_arg args = {
4099 .bitmask = bitmask,
4100 };
4101 struct nfs4_lookup_res res = {
4102 .server = server,
4103 .fattr = info->fattr,
4104 .fh = fhandle,
4105 };
4106 struct rpc_message msg = {
4107 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
4108 .rpc_argp = &args,
4109 .rpc_resp = &res,
4110 };
4111
4112 bitmask[0] = nfs4_fattr_bitmap[0];
4113 bitmask[1] = nfs4_fattr_bitmap[1];
4114 /*
4115 * Process the label in the upcoming getfattr
4116 */
4117 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
4118
4119 nfs_fattr_init(info->fattr);
4120 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4121 }
4122
nfs4_lookup_root(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)4123 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4124 struct nfs_fsinfo *info)
4125 {
4126 struct nfs4_exception exception = {
4127 .interruptible = true,
4128 };
4129 int err;
4130 do {
4131 err = _nfs4_lookup_root(server, fhandle, info);
4132 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
4133 switch (err) {
4134 case 0:
4135 case -NFS4ERR_WRONGSEC:
4136 goto out;
4137 default:
4138 err = nfs4_handle_exception(server, err, &exception);
4139 }
4140 } while (exception.retry);
4141 out:
4142 return err;
4143 }
4144
nfs4_lookup_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info,rpc_authflavor_t flavor)4145 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4146 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
4147 {
4148 struct rpc_auth_create_args auth_args = {
4149 .pseudoflavor = flavor,
4150 };
4151 struct rpc_auth *auth;
4152
4153 auth = rpcauth_create(&auth_args, server->client);
4154 if (IS_ERR(auth))
4155 return -EACCES;
4156 return nfs4_lookup_root(server, fhandle, info);
4157 }
4158
4159 /*
4160 * Retry pseudoroot lookup with various security flavors. We do this when:
4161 *
4162 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
4163 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation
4164 *
4165 * Returns zero on success, or a negative NFS4ERR value, or a
4166 * negative errno value.
4167 */
nfs4_find_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)4168 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4169 struct nfs_fsinfo *info)
4170 {
4171 /* Per 3530bis 15.33.5 */
4172 static const rpc_authflavor_t flav_array[] = {
4173 RPC_AUTH_GSS_KRB5P,
4174 RPC_AUTH_GSS_KRB5I,
4175 RPC_AUTH_GSS_KRB5,
4176 RPC_AUTH_UNIX, /* courtesy */
4177 RPC_AUTH_NULL,
4178 };
4179 int status = -EPERM;
4180 size_t i;
4181
4182 if (server->auth_info.flavor_len > 0) {
4183 /* try each flavor specified by user */
4184 for (i = 0; i < server->auth_info.flavor_len; i++) {
4185 status = nfs4_lookup_root_sec(server, fhandle, info,
4186 server->auth_info.flavors[i]);
4187 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4188 continue;
4189 break;
4190 }
4191 } else {
4192 /* no flavors specified by user, try default list */
4193 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
4194 status = nfs4_lookup_root_sec(server, fhandle, info,
4195 flav_array[i]);
4196 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4197 continue;
4198 break;
4199 }
4200 }
4201
4202 /*
4203 * -EACCES could mean that the user doesn't have correct permissions
4204 * to access the mount. It could also mean that we tried to mount
4205 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
4206 * existing mount programs don't handle -EACCES very well so it should
4207 * be mapped to -EPERM instead.
4208 */
4209 if (status == -EACCES)
4210 status = -EPERM;
4211 return status;
4212 }
4213
4214 /**
4215 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4216 * @server: initialized nfs_server handle
4217 * @fhandle: we fill in the pseudo-fs root file handle
4218 * @info: we fill in an FSINFO struct
4219 * @auth_probe: probe the auth flavours
4220 *
4221 * Returns zero on success, or a negative errno.
4222 */
nfs4_proc_get_rootfh(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info,bool auth_probe)4223 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4224 struct nfs_fsinfo *info,
4225 bool auth_probe)
4226 {
4227 int status = 0;
4228
4229 if (!auth_probe)
4230 status = nfs4_lookup_root(server, fhandle, info);
4231
4232 if (auth_probe || status == NFS4ERR_WRONGSEC)
4233 status = server->nfs_client->cl_mvops->find_root_sec(server,
4234 fhandle, info);
4235
4236 if (status == 0)
4237 status = nfs4_server_capabilities(server, fhandle);
4238 if (status == 0)
4239 status = nfs4_do_fsinfo(server, fhandle, info);
4240
4241 return nfs4_map_errors(status);
4242 }
4243
nfs4_proc_get_root(struct nfs_server * server,struct nfs_fh * mntfh,struct nfs_fsinfo * info)4244 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4245 struct nfs_fsinfo *info)
4246 {
4247 int error;
4248 struct nfs_fattr *fattr = info->fattr;
4249
4250 error = nfs4_server_capabilities(server, mntfh);
4251 if (error < 0) {
4252 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4253 return error;
4254 }
4255
4256 error = nfs4_proc_getattr(server, mntfh, fattr, NULL);
4257 if (error < 0) {
4258 dprintk("nfs4_get_root: getattr error = %d\n", -error);
4259 goto out;
4260 }
4261
4262 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4263 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4264 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4265
4266 out:
4267 return error;
4268 }
4269
4270 /*
4271 * Get locations and (maybe) other attributes of a referral.
4272 * Note that we'll actually follow the referral later when
4273 * we detect fsid mismatch in inode revalidation
4274 */
nfs4_get_referral(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs_fattr * fattr,struct nfs_fh * fhandle)4275 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4276 const struct qstr *name, struct nfs_fattr *fattr,
4277 struct nfs_fh *fhandle)
4278 {
4279 int status = -ENOMEM;
4280 struct page *page = NULL;
4281 struct nfs4_fs_locations *locations = NULL;
4282
4283 page = alloc_page(GFP_KERNEL);
4284 if (page == NULL)
4285 goto out;
4286 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4287 if (locations == NULL)
4288 goto out;
4289
4290 locations->fattr = fattr;
4291
4292 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4293 if (status != 0)
4294 goto out;
4295
4296 /*
4297 * If the fsid didn't change, this is a migration event, not a
4298 * referral. Cause us to drop into the exception handler, which
4299 * will kick off migration recovery.
4300 */
4301 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) {
4302 dprintk("%s: server did not return a different fsid for"
4303 " a referral at %s\n", __func__, name->name);
4304 status = -NFS4ERR_MOVED;
4305 goto out;
4306 }
4307 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4308 nfs_fixup_referral_attributes(fattr);
4309 memset(fhandle, 0, sizeof(struct nfs_fh));
4310 out:
4311 if (page)
4312 __free_page(page);
4313 kfree(locations);
4314 return status;
4315 }
4316
_nfs4_proc_getattr(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct inode * inode)4317 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4318 struct nfs_fattr *fattr, struct inode *inode)
4319 {
4320 __u32 bitmask[NFS4_BITMASK_SZ];
4321 struct nfs4_getattr_arg args = {
4322 .fh = fhandle,
4323 .bitmask = bitmask,
4324 };
4325 struct nfs4_getattr_res res = {
4326 .fattr = fattr,
4327 .server = server,
4328 };
4329 struct rpc_message msg = {
4330 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4331 .rpc_argp = &args,
4332 .rpc_resp = &res,
4333 };
4334 unsigned short task_flags = 0;
4335
4336 if (nfs4_has_session(server->nfs_client))
4337 task_flags = RPC_TASK_MOVEABLE;
4338
4339 /* Is this is an attribute revalidation, subject to softreval? */
4340 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4341 task_flags |= RPC_TASK_TIMEOUT;
4342
4343 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0);
4344 nfs_fattr_init(fattr);
4345 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4346 return nfs4_do_call_sync(server->client, server, &msg,
4347 &args.seq_args, &res.seq_res, task_flags);
4348 }
4349
nfs4_proc_getattr(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct inode * inode)4350 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4351 struct nfs_fattr *fattr, struct inode *inode)
4352 {
4353 struct nfs4_exception exception = {
4354 .interruptible = true,
4355 };
4356 int err;
4357 do {
4358 err = _nfs4_proc_getattr(server, fhandle, fattr, inode);
4359 trace_nfs4_getattr(server, fhandle, fattr, err);
4360 err = nfs4_handle_exception(server, err,
4361 &exception);
4362 } while (exception.retry);
4363 return err;
4364 }
4365
4366 /*
4367 * The file is not closed if it is opened due to the a request to change
4368 * the size of the file. The open call will not be needed once the
4369 * VFS layer lookup-intents are implemented.
4370 *
4371 * Close is called when the inode is destroyed.
4372 * If we haven't opened the file for O_WRONLY, we
4373 * need to in the size_change case to obtain a stateid.
4374 *
4375 * Got race?
4376 * Because OPEN is always done by name in nfsv4, it is
4377 * possible that we opened a different file by the same
4378 * name. We can recognize this race condition, but we
4379 * can't do anything about it besides returning an error.
4380 *
4381 * This will be fixed with VFS changes (lookup-intent).
4382 */
4383 static int
nfs4_proc_setattr(struct dentry * dentry,struct nfs_fattr * fattr,struct iattr * sattr)4384 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4385 struct iattr *sattr)
4386 {
4387 struct inode *inode = d_inode(dentry);
4388 const struct cred *cred = NULL;
4389 struct nfs_open_context *ctx = NULL;
4390 int status;
4391
4392 if (pnfs_ld_layoutret_on_setattr(inode) &&
4393 sattr->ia_valid & ATTR_SIZE &&
4394 sattr->ia_size < i_size_read(inode))
4395 pnfs_commit_and_return_layout(inode);
4396
4397 nfs_fattr_init(fattr);
4398
4399 /* Deal with open(O_TRUNC) */
4400 if (sattr->ia_valid & ATTR_OPEN)
4401 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4402
4403 /* Optimization: if the end result is no change, don't RPC */
4404 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4405 return 0;
4406
4407 /* Search for an existing open(O_WRITE) file */
4408 if (sattr->ia_valid & ATTR_FILE) {
4409
4410 ctx = nfs_file_open_context(sattr->ia_file);
4411 if (ctx)
4412 cred = ctx->cred;
4413 }
4414
4415 /* Return any delegations if we're going to change ACLs */
4416 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4417 nfs4_inode_make_writeable(inode);
4418
4419 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL);
4420 if (status == 0) {
4421 nfs_setattr_update_inode(inode, sattr, fattr);
4422 nfs_setsecurity(inode, fattr);
4423 }
4424 return status;
4425 }
4426
_nfs4_proc_lookup(struct rpc_clnt * clnt,struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4427 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4428 struct dentry *dentry, struct nfs_fh *fhandle,
4429 struct nfs_fattr *fattr)
4430 {
4431 struct nfs_server *server = NFS_SERVER(dir);
4432 int status;
4433 struct nfs4_lookup_arg args = {
4434 .bitmask = server->attr_bitmask,
4435 .dir_fh = NFS_FH(dir),
4436 .name = &dentry->d_name,
4437 };
4438 struct nfs4_lookup_res res = {
4439 .server = server,
4440 .fattr = fattr,
4441 .fh = fhandle,
4442 };
4443 struct rpc_message msg = {
4444 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4445 .rpc_argp = &args,
4446 .rpc_resp = &res,
4447 };
4448 unsigned short task_flags = 0;
4449
4450 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
4451 task_flags = RPC_TASK_MOVEABLE;
4452
4453 /* Is this is an attribute revalidation, subject to softreval? */
4454 if (nfs_lookup_is_soft_revalidate(dentry))
4455 task_flags |= RPC_TASK_TIMEOUT;
4456
4457 args.bitmask = nfs4_bitmask(server, fattr->label);
4458
4459 nfs_fattr_init(fattr);
4460
4461 dprintk("NFS call lookup %pd2\n", dentry);
4462 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4463 status = nfs4_do_call_sync(clnt, server, &msg,
4464 &args.seq_args, &res.seq_res, task_flags);
4465 dprintk("NFS reply lookup: %d\n", status);
4466 return status;
4467 }
4468
nfs_fixup_secinfo_attributes(struct nfs_fattr * fattr)4469 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4470 {
4471 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4472 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4473 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4474 fattr->nlink = 2;
4475 }
4476
nfs4_proc_lookup_common(struct rpc_clnt ** clnt,struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4477 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4478 struct dentry *dentry, struct nfs_fh *fhandle,
4479 struct nfs_fattr *fattr)
4480 {
4481 struct nfs4_exception exception = {
4482 .interruptible = true,
4483 };
4484 struct rpc_clnt *client = *clnt;
4485 const struct qstr *name = &dentry->d_name;
4486 int err;
4487 do {
4488 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr);
4489 trace_nfs4_lookup(dir, name, err);
4490 switch (err) {
4491 case -NFS4ERR_BADNAME:
4492 err = -ENOENT;
4493 goto out;
4494 case -NFS4ERR_MOVED:
4495 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4496 if (err == -NFS4ERR_MOVED)
4497 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4498 goto out;
4499 case -NFS4ERR_WRONGSEC:
4500 err = -EPERM;
4501 if (client != *clnt)
4502 goto out;
4503 client = nfs4_negotiate_security(client, dir, name);
4504 if (IS_ERR(client))
4505 return PTR_ERR(client);
4506
4507 exception.retry = 1;
4508 break;
4509 default:
4510 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4511 }
4512 } while (exception.retry);
4513
4514 out:
4515 if (err == 0)
4516 *clnt = client;
4517 else if (client != *clnt)
4518 rpc_shutdown_client(client);
4519
4520 return err;
4521 }
4522
nfs4_proc_lookup(struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4523 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry,
4524 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4525 {
4526 int status;
4527 struct rpc_clnt *client = NFS_CLIENT(dir);
4528
4529 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4530 if (client != NFS_CLIENT(dir)) {
4531 rpc_shutdown_client(client);
4532 nfs_fixup_secinfo_attributes(fattr);
4533 }
4534 return status;
4535 }
4536
4537 struct rpc_clnt *
nfs4_proc_lookup_mountpoint(struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4538 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4539 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4540 {
4541 struct rpc_clnt *client = NFS_CLIENT(dir);
4542 int status;
4543
4544 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4545 if (status < 0)
4546 return ERR_PTR(status);
4547 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4548 }
4549
_nfs4_proc_lookupp(struct inode * inode,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4550 static int _nfs4_proc_lookupp(struct inode *inode,
4551 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4552 {
4553 struct rpc_clnt *clnt = NFS_CLIENT(inode);
4554 struct nfs_server *server = NFS_SERVER(inode);
4555 int status;
4556 struct nfs4_lookupp_arg args = {
4557 .bitmask = server->attr_bitmask,
4558 .fh = NFS_FH(inode),
4559 };
4560 struct nfs4_lookupp_res res = {
4561 .server = server,
4562 .fattr = fattr,
4563 .fh = fhandle,
4564 };
4565 struct rpc_message msg = {
4566 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4567 .rpc_argp = &args,
4568 .rpc_resp = &res,
4569 };
4570 unsigned short task_flags = 0;
4571
4572 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
4573 task_flags |= RPC_TASK_TIMEOUT;
4574
4575 args.bitmask = nfs4_bitmask(server, fattr->label);
4576
4577 nfs_fattr_init(fattr);
4578
4579 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino);
4580 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4581 &res.seq_res, task_flags);
4582 dprintk("NFS reply lookupp: %d\n", status);
4583 return status;
4584 }
4585
nfs4_proc_lookupp(struct inode * inode,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4586 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4587 struct nfs_fattr *fattr)
4588 {
4589 struct nfs4_exception exception = {
4590 .interruptible = true,
4591 };
4592 int err;
4593 do {
4594 err = _nfs4_proc_lookupp(inode, fhandle, fattr);
4595 trace_nfs4_lookupp(inode, err);
4596 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4597 &exception);
4598 } while (exception.retry);
4599 return err;
4600 }
4601
_nfs4_proc_access(struct inode * inode,struct nfs_access_entry * entry,const struct cred * cred)4602 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4603 const struct cred *cred)
4604 {
4605 struct nfs_server *server = NFS_SERVER(inode);
4606 struct nfs4_accessargs args = {
4607 .fh = NFS_FH(inode),
4608 .access = entry->mask,
4609 };
4610 struct nfs4_accessres res = {
4611 .server = server,
4612 };
4613 struct rpc_message msg = {
4614 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4615 .rpc_argp = &args,
4616 .rpc_resp = &res,
4617 .rpc_cred = cred,
4618 };
4619 int status = 0;
4620
4621 if (!nfs4_have_delegation(inode, FMODE_READ)) {
4622 res.fattr = nfs_alloc_fattr();
4623 if (res.fattr == NULL)
4624 return -ENOMEM;
4625 args.bitmask = server->cache_consistency_bitmask;
4626 }
4627 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4628 if (!status) {
4629 nfs_access_set_mask(entry, res.access);
4630 if (res.fattr)
4631 nfs_refresh_inode(inode, res.fattr);
4632 }
4633 nfs_free_fattr(res.fattr);
4634 return status;
4635 }
4636
nfs4_proc_access(struct inode * inode,struct nfs_access_entry * entry,const struct cred * cred)4637 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4638 const struct cred *cred)
4639 {
4640 struct nfs4_exception exception = {
4641 .interruptible = true,
4642 };
4643 int err;
4644 do {
4645 err = _nfs4_proc_access(inode, entry, cred);
4646 trace_nfs4_access(inode, err);
4647 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4648 &exception);
4649 } while (exception.retry);
4650 return err;
4651 }
4652
4653 /*
4654 * TODO: For the time being, we don't try to get any attributes
4655 * along with any of the zero-copy operations READ, READDIR,
4656 * READLINK, WRITE.
4657 *
4658 * In the case of the first three, we want to put the GETATTR
4659 * after the read-type operation -- this is because it is hard
4660 * to predict the length of a GETATTR response in v4, and thus
4661 * align the READ data correctly. This means that the GETATTR
4662 * may end up partially falling into the page cache, and we should
4663 * shift it into the 'tail' of the xdr_buf before processing.
4664 * To do this efficiently, we need to know the total length
4665 * of data received, which doesn't seem to be available outside
4666 * of the RPC layer.
4667 *
4668 * In the case of WRITE, we also want to put the GETATTR after
4669 * the operation -- in this case because we want to make sure
4670 * we get the post-operation mtime and size.
4671 *
4672 * Both of these changes to the XDR layer would in fact be quite
4673 * minor, but I decided to leave them for a subsequent patch.
4674 */
_nfs4_proc_readlink(struct inode * inode,struct page * page,unsigned int pgbase,unsigned int pglen)4675 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4676 unsigned int pgbase, unsigned int pglen)
4677 {
4678 struct nfs4_readlink args = {
4679 .fh = NFS_FH(inode),
4680 .pgbase = pgbase,
4681 .pglen = pglen,
4682 .pages = &page,
4683 };
4684 struct nfs4_readlink_res res;
4685 struct rpc_message msg = {
4686 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4687 .rpc_argp = &args,
4688 .rpc_resp = &res,
4689 };
4690
4691 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4692 }
4693
nfs4_proc_readlink(struct inode * inode,struct page * page,unsigned int pgbase,unsigned int pglen)4694 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4695 unsigned int pgbase, unsigned int pglen)
4696 {
4697 struct nfs4_exception exception = {
4698 .interruptible = true,
4699 };
4700 int err;
4701 do {
4702 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4703 trace_nfs4_readlink(inode, err);
4704 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4705 &exception);
4706 } while (exception.retry);
4707 return err;
4708 }
4709
4710 /*
4711 * This is just for mknod. open(O_CREAT) will always do ->open_context().
4712 */
4713 static int
nfs4_proc_create(struct inode * dir,struct dentry * dentry,struct iattr * sattr,int flags)4714 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4715 int flags)
4716 {
4717 struct nfs_server *server = NFS_SERVER(dir);
4718 struct nfs4_label l, *ilabel;
4719 struct nfs_open_context *ctx;
4720 struct nfs4_state *state;
4721 int status = 0;
4722
4723 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4724 if (IS_ERR(ctx))
4725 return PTR_ERR(ctx);
4726
4727 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4728
4729 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4730 sattr->ia_mode &= ~current_umask();
4731 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4732 if (IS_ERR(state)) {
4733 status = PTR_ERR(state);
4734 goto out;
4735 }
4736 out:
4737 nfs4_label_release_security(ilabel);
4738 put_nfs_open_context(ctx);
4739 return status;
4740 }
4741
4742 static int
_nfs4_proc_remove(struct inode * dir,const struct qstr * name,u32 ftype)4743 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4744 {
4745 struct nfs_server *server = NFS_SERVER(dir);
4746 struct nfs_removeargs args = {
4747 .fh = NFS_FH(dir),
4748 .name = *name,
4749 };
4750 struct nfs_removeres res = {
4751 .server = server,
4752 };
4753 struct rpc_message msg = {
4754 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4755 .rpc_argp = &args,
4756 .rpc_resp = &res,
4757 };
4758 unsigned long timestamp = jiffies;
4759 int status;
4760
4761 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4762 if (status == 0) {
4763 spin_lock(&dir->i_lock);
4764 /* Removing a directory decrements nlink in the parent */
4765 if (ftype == NF4DIR && dir->i_nlink > 2)
4766 nfs4_dec_nlink_locked(dir);
4767 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4768 NFS_INO_INVALID_DATA);
4769 spin_unlock(&dir->i_lock);
4770 }
4771 return status;
4772 }
4773
nfs4_proc_remove(struct inode * dir,struct dentry * dentry)4774 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4775 {
4776 struct nfs4_exception exception = {
4777 .interruptible = true,
4778 };
4779 struct inode *inode = d_inode(dentry);
4780 int err;
4781
4782 if (inode) {
4783 if (inode->i_nlink == 1)
4784 nfs4_inode_return_delegation(inode);
4785 else
4786 nfs4_inode_make_writeable(inode);
4787 }
4788 do {
4789 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4790 trace_nfs4_remove(dir, &dentry->d_name, err);
4791 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4792 &exception);
4793 } while (exception.retry);
4794 return err;
4795 }
4796
nfs4_proc_rmdir(struct inode * dir,const struct qstr * name)4797 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4798 {
4799 struct nfs4_exception exception = {
4800 .interruptible = true,
4801 };
4802 int err;
4803
4804 do {
4805 err = _nfs4_proc_remove(dir, name, NF4DIR);
4806 trace_nfs4_remove(dir, name, err);
4807 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4808 &exception);
4809 } while (exception.retry);
4810 return err;
4811 }
4812
nfs4_proc_unlink_setup(struct rpc_message * msg,struct dentry * dentry,struct inode * inode)4813 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4814 struct dentry *dentry,
4815 struct inode *inode)
4816 {
4817 struct nfs_removeargs *args = msg->rpc_argp;
4818 struct nfs_removeres *res = msg->rpc_resp;
4819
4820 res->server = NFS_SB(dentry->d_sb);
4821 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4822 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4823
4824 nfs_fattr_init(res->dir_attr);
4825
4826 if (inode) {
4827 nfs4_inode_return_delegation(inode);
4828 nfs_d_prune_case_insensitive_aliases(inode);
4829 }
4830 }
4831
nfs4_proc_unlink_rpc_prepare(struct rpc_task * task,struct nfs_unlinkdata * data)4832 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4833 {
4834 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4835 &data->args.seq_args,
4836 &data->res.seq_res,
4837 task);
4838 }
4839
nfs4_proc_unlink_done(struct rpc_task * task,struct inode * dir)4840 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4841 {
4842 struct nfs_unlinkdata *data = task->tk_calldata;
4843 struct nfs_removeres *res = &data->res;
4844
4845 if (!nfs4_sequence_done(task, &res->seq_res))
4846 return 0;
4847 if (nfs4_async_handle_error(task, res->server, NULL,
4848 &data->timeout) == -EAGAIN)
4849 return 0;
4850 if (task->tk_status == 0)
4851 nfs4_update_changeattr(dir, &res->cinfo,
4852 res->dir_attr->time_start,
4853 NFS_INO_INVALID_DATA);
4854 return 1;
4855 }
4856
nfs4_proc_rename_setup(struct rpc_message * msg,struct dentry * old_dentry,struct dentry * new_dentry)4857 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4858 struct dentry *old_dentry,
4859 struct dentry *new_dentry)
4860 {
4861 struct nfs_renameargs *arg = msg->rpc_argp;
4862 struct nfs_renameres *res = msg->rpc_resp;
4863 struct inode *old_inode = d_inode(old_dentry);
4864 struct inode *new_inode = d_inode(new_dentry);
4865
4866 if (old_inode)
4867 nfs4_inode_make_writeable(old_inode);
4868 if (new_inode)
4869 nfs4_inode_return_delegation(new_inode);
4870 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4871 res->server = NFS_SB(old_dentry->d_sb);
4872 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4873 }
4874
nfs4_proc_rename_rpc_prepare(struct rpc_task * task,struct nfs_renamedata * data)4875 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4876 {
4877 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4878 &data->args.seq_args,
4879 &data->res.seq_res,
4880 task);
4881 }
4882
nfs4_proc_rename_done(struct rpc_task * task,struct inode * old_dir,struct inode * new_dir)4883 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4884 struct inode *new_dir)
4885 {
4886 struct nfs_renamedata *data = task->tk_calldata;
4887 struct nfs_renameres *res = &data->res;
4888
4889 if (!nfs4_sequence_done(task, &res->seq_res))
4890 return 0;
4891 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4892 return 0;
4893
4894 if (task->tk_status == 0) {
4895 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry));
4896 if (new_dir != old_dir) {
4897 /* Note: If we moved a directory, nlink will change */
4898 nfs4_update_changeattr(old_dir, &res->old_cinfo,
4899 res->old_fattr->time_start,
4900 NFS_INO_INVALID_NLINK |
4901 NFS_INO_INVALID_DATA);
4902 nfs4_update_changeattr(new_dir, &res->new_cinfo,
4903 res->new_fattr->time_start,
4904 NFS_INO_INVALID_NLINK |
4905 NFS_INO_INVALID_DATA);
4906 } else
4907 nfs4_update_changeattr(old_dir, &res->old_cinfo,
4908 res->old_fattr->time_start,
4909 NFS_INO_INVALID_DATA);
4910 }
4911 return 1;
4912 }
4913
_nfs4_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)4914 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4915 {
4916 struct nfs_server *server = NFS_SERVER(inode);
4917 __u32 bitmask[NFS4_BITMASK_SZ];
4918 struct nfs4_link_arg arg = {
4919 .fh = NFS_FH(inode),
4920 .dir_fh = NFS_FH(dir),
4921 .name = name,
4922 .bitmask = bitmask,
4923 };
4924 struct nfs4_link_res res = {
4925 .server = server,
4926 };
4927 struct rpc_message msg = {
4928 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4929 .rpc_argp = &arg,
4930 .rpc_resp = &res,
4931 };
4932 int status = -ENOMEM;
4933
4934 res.fattr = nfs_alloc_fattr_with_label(server);
4935 if (res.fattr == NULL)
4936 goto out;
4937
4938 nfs4_inode_make_writeable(inode);
4939 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode,
4940 NFS_INO_INVALID_CHANGE);
4941 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4942 if (!status) {
4943 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
4944 NFS_INO_INVALID_DATA);
4945 nfs4_inc_nlink(inode);
4946 status = nfs_post_op_update_inode(inode, res.fattr);
4947 if (!status)
4948 nfs_setsecurity(inode, res.fattr);
4949 }
4950
4951 out:
4952 nfs_free_fattr(res.fattr);
4953 return status;
4954 }
4955
nfs4_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)4956 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4957 {
4958 struct nfs4_exception exception = {
4959 .interruptible = true,
4960 };
4961 int err;
4962 do {
4963 err = nfs4_handle_exception(NFS_SERVER(inode),
4964 _nfs4_proc_link(inode, dir, name),
4965 &exception);
4966 } while (exception.retry);
4967 return err;
4968 }
4969
4970 struct nfs4_createdata {
4971 struct rpc_message msg;
4972 struct nfs4_create_arg arg;
4973 struct nfs4_create_res res;
4974 struct nfs_fh fh;
4975 struct nfs_fattr fattr;
4976 };
4977
nfs4_alloc_createdata(struct inode * dir,const struct qstr * name,struct iattr * sattr,u32 ftype)4978 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4979 const struct qstr *name, struct iattr *sattr, u32 ftype)
4980 {
4981 struct nfs4_createdata *data;
4982
4983 data = kzalloc(sizeof(*data), GFP_KERNEL);
4984 if (data != NULL) {
4985 struct nfs_server *server = NFS_SERVER(dir);
4986
4987 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL);
4988 if (IS_ERR(data->fattr.label))
4989 goto out_free;
4990
4991 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4992 data->msg.rpc_argp = &data->arg;
4993 data->msg.rpc_resp = &data->res;
4994 data->arg.dir_fh = NFS_FH(dir);
4995 data->arg.server = server;
4996 data->arg.name = name;
4997 data->arg.attrs = sattr;
4998 data->arg.ftype = ftype;
4999 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label);
5000 data->arg.umask = current_umask();
5001 data->res.server = server;
5002 data->res.fh = &data->fh;
5003 data->res.fattr = &data->fattr;
5004 nfs_fattr_init(data->res.fattr);
5005 }
5006 return data;
5007 out_free:
5008 kfree(data);
5009 return NULL;
5010 }
5011
nfs4_do_create(struct inode * dir,struct dentry * dentry,struct nfs4_createdata * data)5012 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
5013 {
5014 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
5015 &data->arg.seq_args, &data->res.seq_res, 1);
5016 if (status == 0) {
5017 spin_lock(&dir->i_lock);
5018 /* Creating a directory bumps nlink in the parent */
5019 if (data->arg.ftype == NF4DIR)
5020 nfs4_inc_nlink_locked(dir);
5021 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
5022 data->res.fattr->time_start,
5023 NFS_INO_INVALID_DATA);
5024 spin_unlock(&dir->i_lock);
5025 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
5026 }
5027 return status;
5028 }
5029
nfs4_free_createdata(struct nfs4_createdata * data)5030 static void nfs4_free_createdata(struct nfs4_createdata *data)
5031 {
5032 nfs4_label_free(data->fattr.label);
5033 kfree(data);
5034 }
5035
_nfs4_proc_symlink(struct inode * dir,struct dentry * dentry,struct page * page,unsigned int len,struct iattr * sattr,struct nfs4_label * label)5036 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5037 struct page *page, unsigned int len, struct iattr *sattr,
5038 struct nfs4_label *label)
5039 {
5040 struct nfs4_createdata *data;
5041 int status = -ENAMETOOLONG;
5042
5043 if (len > NFS4_MAXPATHLEN)
5044 goto out;
5045
5046 status = -ENOMEM;
5047 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
5048 if (data == NULL)
5049 goto out;
5050
5051 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
5052 data->arg.u.symlink.pages = &page;
5053 data->arg.u.symlink.len = len;
5054 data->arg.label = label;
5055
5056 status = nfs4_do_create(dir, dentry, data);
5057
5058 nfs4_free_createdata(data);
5059 out:
5060 return status;
5061 }
5062
nfs4_proc_symlink(struct inode * dir,struct dentry * dentry,struct page * page,unsigned int len,struct iattr * sattr)5063 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5064 struct page *page, unsigned int len, struct iattr *sattr)
5065 {
5066 struct nfs4_exception exception = {
5067 .interruptible = true,
5068 };
5069 struct nfs4_label l, *label;
5070 int err;
5071
5072 label = nfs4_label_init_security(dir, dentry, sattr, &l);
5073
5074 do {
5075 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
5076 trace_nfs4_symlink(dir, &dentry->d_name, err);
5077 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5078 &exception);
5079 } while (exception.retry);
5080
5081 nfs4_label_release_security(label);
5082 return err;
5083 }
5084
_nfs4_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label)5085 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5086 struct iattr *sattr, struct nfs4_label *label)
5087 {
5088 struct nfs4_createdata *data;
5089 int status = -ENOMEM;
5090
5091 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
5092 if (data == NULL)
5093 goto out;
5094
5095 data->arg.label = label;
5096 status = nfs4_do_create(dir, dentry, data);
5097
5098 nfs4_free_createdata(data);
5099 out:
5100 return status;
5101 }
5102
nfs4_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr)5103 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5104 struct iattr *sattr)
5105 {
5106 struct nfs_server *server = NFS_SERVER(dir);
5107 struct nfs4_exception exception = {
5108 .interruptible = true,
5109 };
5110 struct nfs4_label l, *label;
5111 int err;
5112
5113 label = nfs4_label_init_security(dir, dentry, sattr, &l);
5114
5115 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5116 sattr->ia_mode &= ~current_umask();
5117 do {
5118 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
5119 trace_nfs4_mkdir(dir, &dentry->d_name, err);
5120 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5121 &exception);
5122 } while (exception.retry);
5123 nfs4_label_release_security(label);
5124
5125 return err;
5126 }
5127
_nfs4_proc_readdir(struct nfs_readdir_arg * nr_arg,struct nfs_readdir_res * nr_res)5128 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg,
5129 struct nfs_readdir_res *nr_res)
5130 {
5131 struct inode *dir = d_inode(nr_arg->dentry);
5132 struct nfs_server *server = NFS_SERVER(dir);
5133 struct nfs4_readdir_arg args = {
5134 .fh = NFS_FH(dir),
5135 .pages = nr_arg->pages,
5136 .pgbase = 0,
5137 .count = nr_arg->page_len,
5138 .plus = nr_arg->plus,
5139 };
5140 struct nfs4_readdir_res res;
5141 struct rpc_message msg = {
5142 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
5143 .rpc_argp = &args,
5144 .rpc_resp = &res,
5145 .rpc_cred = nr_arg->cred,
5146 };
5147 int status;
5148
5149 dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__,
5150 nr_arg->dentry, (unsigned long long)nr_arg->cookie);
5151 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
5152 args.bitmask = server->attr_bitmask_nl;
5153 else
5154 args.bitmask = server->attr_bitmask;
5155
5156 nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args);
5157 res.pgbase = args.pgbase;
5158 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5159 &res.seq_res, 0);
5160 if (status >= 0) {
5161 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE);
5162 status += args.pgbase;
5163 }
5164
5165 nfs_invalidate_atime(dir);
5166
5167 dprintk("%s: returns %d\n", __func__, status);
5168 return status;
5169 }
5170
nfs4_proc_readdir(struct nfs_readdir_arg * arg,struct nfs_readdir_res * res)5171 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg,
5172 struct nfs_readdir_res *res)
5173 {
5174 struct nfs4_exception exception = {
5175 .interruptible = true,
5176 };
5177 int err;
5178 do {
5179 err = _nfs4_proc_readdir(arg, res);
5180 trace_nfs4_readdir(d_inode(arg->dentry), err);
5181 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)),
5182 err, &exception);
5183 } while (exception.retry);
5184 return err;
5185 }
5186
_nfs4_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label,dev_t rdev)5187 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5188 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
5189 {
5190 struct nfs4_createdata *data;
5191 int mode = sattr->ia_mode;
5192 int status = -ENOMEM;
5193
5194 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
5195 if (data == NULL)
5196 goto out;
5197
5198 if (S_ISFIFO(mode))
5199 data->arg.ftype = NF4FIFO;
5200 else if (S_ISBLK(mode)) {
5201 data->arg.ftype = NF4BLK;
5202 data->arg.u.device.specdata1 = MAJOR(rdev);
5203 data->arg.u.device.specdata2 = MINOR(rdev);
5204 }
5205 else if (S_ISCHR(mode)) {
5206 data->arg.ftype = NF4CHR;
5207 data->arg.u.device.specdata1 = MAJOR(rdev);
5208 data->arg.u.device.specdata2 = MINOR(rdev);
5209 } else if (!S_ISSOCK(mode)) {
5210 status = -EINVAL;
5211 goto out_free;
5212 }
5213
5214 data->arg.label = label;
5215 status = nfs4_do_create(dir, dentry, data);
5216 out_free:
5217 nfs4_free_createdata(data);
5218 out:
5219 return status;
5220 }
5221
nfs4_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,dev_t rdev)5222 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5223 struct iattr *sattr, dev_t rdev)
5224 {
5225 struct nfs_server *server = NFS_SERVER(dir);
5226 struct nfs4_exception exception = {
5227 .interruptible = true,
5228 };
5229 struct nfs4_label l, *label;
5230 int err;
5231
5232 label = nfs4_label_init_security(dir, dentry, sattr, &l);
5233
5234 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5235 sattr->ia_mode &= ~current_umask();
5236 do {
5237 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5238 trace_nfs4_mknod(dir, &dentry->d_name, err);
5239 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5240 &exception);
5241 } while (exception.retry);
5242
5243 nfs4_label_release_security(label);
5244
5245 return err;
5246 }
5247
_nfs4_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * fsstat)5248 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5249 struct nfs_fsstat *fsstat)
5250 {
5251 struct nfs4_statfs_arg args = {
5252 .fh = fhandle,
5253 .bitmask = server->attr_bitmask,
5254 };
5255 struct nfs4_statfs_res res = {
5256 .fsstat = fsstat,
5257 };
5258 struct rpc_message msg = {
5259 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5260 .rpc_argp = &args,
5261 .rpc_resp = &res,
5262 };
5263
5264 nfs_fattr_init(fsstat->fattr);
5265 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5266 }
5267
nfs4_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * fsstat)5268 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5269 {
5270 struct nfs4_exception exception = {
5271 .interruptible = true,
5272 };
5273 int err;
5274 do {
5275 err = nfs4_handle_exception(server,
5276 _nfs4_proc_statfs(server, fhandle, fsstat),
5277 &exception);
5278 } while (exception.retry);
5279 return err;
5280 }
5281
_nfs4_do_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5282 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5283 struct nfs_fsinfo *fsinfo)
5284 {
5285 struct nfs4_fsinfo_arg args = {
5286 .fh = fhandle,
5287 .bitmask = server->attr_bitmask,
5288 };
5289 struct nfs4_fsinfo_res res = {
5290 .fsinfo = fsinfo,
5291 };
5292 struct rpc_message msg = {
5293 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5294 .rpc_argp = &args,
5295 .rpc_resp = &res,
5296 };
5297
5298 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5299 }
5300
nfs4_do_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5301 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5302 {
5303 struct nfs4_exception exception = {
5304 .interruptible = true,
5305 };
5306 int err;
5307
5308 do {
5309 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5310 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5311 if (err == 0) {
5312 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
5313 break;
5314 }
5315 err = nfs4_handle_exception(server, err, &exception);
5316 } while (exception.retry);
5317 return err;
5318 }
5319
nfs4_proc_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5320 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5321 {
5322 int error;
5323
5324 nfs_fattr_init(fsinfo->fattr);
5325 error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5326 if (error == 0) {
5327 /* block layout checks this! */
5328 server->pnfs_blksize = fsinfo->blksize;
5329 set_pnfs_layoutdriver(server, fhandle, fsinfo);
5330 }
5331
5332 return error;
5333 }
5334
_nfs4_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * pathconf)5335 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5336 struct nfs_pathconf *pathconf)
5337 {
5338 struct nfs4_pathconf_arg args = {
5339 .fh = fhandle,
5340 .bitmask = server->attr_bitmask,
5341 };
5342 struct nfs4_pathconf_res res = {
5343 .pathconf = pathconf,
5344 };
5345 struct rpc_message msg = {
5346 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5347 .rpc_argp = &args,
5348 .rpc_resp = &res,
5349 };
5350
5351 /* None of the pathconf attributes are mandatory to implement */
5352 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5353 memset(pathconf, 0, sizeof(*pathconf));
5354 return 0;
5355 }
5356
5357 nfs_fattr_init(pathconf->fattr);
5358 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5359 }
5360
nfs4_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * pathconf)5361 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5362 struct nfs_pathconf *pathconf)
5363 {
5364 struct nfs4_exception exception = {
5365 .interruptible = true,
5366 };
5367 int err;
5368
5369 do {
5370 err = nfs4_handle_exception(server,
5371 _nfs4_proc_pathconf(server, fhandle, pathconf),
5372 &exception);
5373 } while (exception.retry);
5374 return err;
5375 }
5376
nfs4_set_rw_stateid(nfs4_stateid * stateid,const struct nfs_open_context * ctx,const struct nfs_lock_context * l_ctx,fmode_t fmode)5377 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5378 const struct nfs_open_context *ctx,
5379 const struct nfs_lock_context *l_ctx,
5380 fmode_t fmode)
5381 {
5382 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5383 }
5384 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5385
nfs4_stateid_is_current(nfs4_stateid * stateid,const struct nfs_open_context * ctx,const struct nfs_lock_context * l_ctx,fmode_t fmode)5386 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5387 const struct nfs_open_context *ctx,
5388 const struct nfs_lock_context *l_ctx,
5389 fmode_t fmode)
5390 {
5391 nfs4_stateid _current_stateid;
5392
5393 /* If the current stateid represents a lost lock, then exit */
5394 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5395 return true;
5396 return nfs4_stateid_match(stateid, &_current_stateid);
5397 }
5398
nfs4_error_stateid_expired(int err)5399 static bool nfs4_error_stateid_expired(int err)
5400 {
5401 switch (err) {
5402 case -NFS4ERR_DELEG_REVOKED:
5403 case -NFS4ERR_ADMIN_REVOKED:
5404 case -NFS4ERR_BAD_STATEID:
5405 case -NFS4ERR_STALE_STATEID:
5406 case -NFS4ERR_OLD_STATEID:
5407 case -NFS4ERR_OPENMODE:
5408 case -NFS4ERR_EXPIRED:
5409 return true;
5410 }
5411 return false;
5412 }
5413
nfs4_read_done_cb(struct rpc_task * task,struct nfs_pgio_header * hdr)5414 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5415 {
5416 struct nfs_server *server = NFS_SERVER(hdr->inode);
5417
5418 trace_nfs4_read(hdr, task->tk_status);
5419 if (task->tk_status < 0) {
5420 struct nfs4_exception exception = {
5421 .inode = hdr->inode,
5422 .state = hdr->args.context->state,
5423 .stateid = &hdr->args.stateid,
5424 };
5425 task->tk_status = nfs4_async_handle_exception(task,
5426 server, task->tk_status, &exception);
5427 if (exception.retry) {
5428 rpc_restart_call_prepare(task);
5429 return -EAGAIN;
5430 }
5431 }
5432
5433 if (task->tk_status > 0)
5434 renew_lease(server, hdr->timestamp);
5435 return 0;
5436 }
5437
nfs4_read_stateid_changed(struct rpc_task * task,struct nfs_pgio_args * args)5438 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5439 struct nfs_pgio_args *args)
5440 {
5441
5442 if (!nfs4_error_stateid_expired(task->tk_status) ||
5443 nfs4_stateid_is_current(&args->stateid,
5444 args->context,
5445 args->lock_context,
5446 FMODE_READ))
5447 return false;
5448 rpc_restart_call_prepare(task);
5449 return true;
5450 }
5451
nfs4_read_plus_not_supported(struct rpc_task * task,struct nfs_pgio_header * hdr)5452 static bool nfs4_read_plus_not_supported(struct rpc_task *task,
5453 struct nfs_pgio_header *hdr)
5454 {
5455 struct nfs_server *server = NFS_SERVER(hdr->inode);
5456 struct rpc_message *msg = &task->tk_msg;
5457
5458 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
5459 task->tk_status == -ENOTSUPP) {
5460 server->caps &= ~NFS_CAP_READ_PLUS;
5461 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5462 rpc_restart_call_prepare(task);
5463 return true;
5464 }
5465 return false;
5466 }
5467
nfs4_read_done(struct rpc_task * task,struct nfs_pgio_header * hdr)5468 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5469 {
5470 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5471 return -EAGAIN;
5472 if (nfs4_read_stateid_changed(task, &hdr->args))
5473 return -EAGAIN;
5474 if (nfs4_read_plus_not_supported(task, hdr))
5475 return -EAGAIN;
5476 if (task->tk_status > 0)
5477 nfs_invalidate_atime(hdr->inode);
5478 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5479 nfs4_read_done_cb(task, hdr);
5480 }
5481
5482 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS
nfs42_read_plus_support(struct nfs_pgio_header * hdr,struct rpc_message * msg)5483 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5484 struct rpc_message *msg)
5485 {
5486 /* Note: We don't use READ_PLUS with pNFS yet */
5487 if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) {
5488 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
5489 return nfs_read_alloc_scratch(hdr, READ_PLUS_SCRATCH_SIZE);
5490 }
5491 return false;
5492 }
5493 #else
nfs42_read_plus_support(struct nfs_pgio_header * hdr,struct rpc_message * msg)5494 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5495 struct rpc_message *msg)
5496 {
5497 return false;
5498 }
5499 #endif /* CONFIG_NFS_V4_2 */
5500
nfs4_proc_read_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg)5501 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5502 struct rpc_message *msg)
5503 {
5504 hdr->timestamp = jiffies;
5505 if (!hdr->pgio_done_cb)
5506 hdr->pgio_done_cb = nfs4_read_done_cb;
5507 if (!nfs42_read_plus_support(hdr, msg))
5508 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5509 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5510 }
5511
nfs4_proc_pgio_rpc_prepare(struct rpc_task * task,struct nfs_pgio_header * hdr)5512 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5513 struct nfs_pgio_header *hdr)
5514 {
5515 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5516 &hdr->args.seq_args,
5517 &hdr->res.seq_res,
5518 task))
5519 return 0;
5520 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5521 hdr->args.lock_context,
5522 hdr->rw_mode) == -EIO)
5523 return -EIO;
5524 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5525 return -EIO;
5526 return 0;
5527 }
5528
nfs4_write_done_cb(struct rpc_task * task,struct nfs_pgio_header * hdr)5529 static int nfs4_write_done_cb(struct rpc_task *task,
5530 struct nfs_pgio_header *hdr)
5531 {
5532 struct inode *inode = hdr->inode;
5533
5534 trace_nfs4_write(hdr, task->tk_status);
5535 if (task->tk_status < 0) {
5536 struct nfs4_exception exception = {
5537 .inode = hdr->inode,
5538 .state = hdr->args.context->state,
5539 .stateid = &hdr->args.stateid,
5540 };
5541 task->tk_status = nfs4_async_handle_exception(task,
5542 NFS_SERVER(inode), task->tk_status,
5543 &exception);
5544 if (exception.retry) {
5545 rpc_restart_call_prepare(task);
5546 return -EAGAIN;
5547 }
5548 }
5549 if (task->tk_status >= 0) {
5550 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5551 nfs_writeback_update_inode(hdr);
5552 }
5553 return 0;
5554 }
5555
nfs4_write_stateid_changed(struct rpc_task * task,struct nfs_pgio_args * args)5556 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5557 struct nfs_pgio_args *args)
5558 {
5559
5560 if (!nfs4_error_stateid_expired(task->tk_status) ||
5561 nfs4_stateid_is_current(&args->stateid,
5562 args->context,
5563 args->lock_context,
5564 FMODE_WRITE))
5565 return false;
5566 rpc_restart_call_prepare(task);
5567 return true;
5568 }
5569
nfs4_write_done(struct rpc_task * task,struct nfs_pgio_header * hdr)5570 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5571 {
5572 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5573 return -EAGAIN;
5574 if (nfs4_write_stateid_changed(task, &hdr->args))
5575 return -EAGAIN;
5576 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5577 nfs4_write_done_cb(task, hdr);
5578 }
5579
5580 static
nfs4_write_need_cache_consistency_data(struct nfs_pgio_header * hdr)5581 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5582 {
5583 /* Don't request attributes for pNFS or O_DIRECT writes */
5584 if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5585 return false;
5586 /* Otherwise, request attributes if and only if we don't hold
5587 * a delegation
5588 */
5589 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
5590 }
5591
nfs4_bitmask_set(__u32 bitmask[],const __u32 src[],struct inode * inode,unsigned long cache_validity)5592 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
5593 struct inode *inode, unsigned long cache_validity)
5594 {
5595 struct nfs_server *server = NFS_SERVER(inode);
5596 unsigned int i;
5597
5598 memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ);
5599 cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity);
5600
5601 if (cache_validity & NFS_INO_INVALID_CHANGE)
5602 bitmask[0] |= FATTR4_WORD0_CHANGE;
5603 if (cache_validity & NFS_INO_INVALID_ATIME)
5604 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS;
5605 if (cache_validity & NFS_INO_INVALID_MODE)
5606 bitmask[1] |= FATTR4_WORD1_MODE;
5607 if (cache_validity & NFS_INO_INVALID_OTHER)
5608 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP;
5609 if (cache_validity & NFS_INO_INVALID_NLINK)
5610 bitmask[1] |= FATTR4_WORD1_NUMLINKS;
5611 if (cache_validity & NFS_INO_INVALID_CTIME)
5612 bitmask[1] |= FATTR4_WORD1_TIME_METADATA;
5613 if (cache_validity & NFS_INO_INVALID_MTIME)
5614 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY;
5615 if (cache_validity & NFS_INO_INVALID_BLOCKS)
5616 bitmask[1] |= FATTR4_WORD1_SPACE_USED;
5617
5618 if (cache_validity & NFS_INO_INVALID_SIZE)
5619 bitmask[0] |= FATTR4_WORD0_SIZE;
5620
5621 for (i = 0; i < NFS4_BITMASK_SZ; i++)
5622 bitmask[i] &= server->attr_bitmask[i];
5623 }
5624
nfs4_proc_write_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg,struct rpc_clnt ** clnt)5625 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5626 struct rpc_message *msg,
5627 struct rpc_clnt **clnt)
5628 {
5629 struct nfs_server *server = NFS_SERVER(hdr->inode);
5630
5631 if (!nfs4_write_need_cache_consistency_data(hdr)) {
5632 hdr->args.bitmask = NULL;
5633 hdr->res.fattr = NULL;
5634 } else {
5635 nfs4_bitmask_set(hdr->args.bitmask_store,
5636 server->cache_consistency_bitmask,
5637 hdr->inode, NFS_INO_INVALID_BLOCKS);
5638 hdr->args.bitmask = hdr->args.bitmask_store;
5639 }
5640
5641 if (!hdr->pgio_done_cb)
5642 hdr->pgio_done_cb = nfs4_write_done_cb;
5643 hdr->res.server = server;
5644 hdr->timestamp = jiffies;
5645
5646 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5647 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5648 nfs4_state_protect_write(hdr->ds_clp ? hdr->ds_clp : server->nfs_client, clnt, msg, hdr);
5649 }
5650
nfs4_proc_commit_rpc_prepare(struct rpc_task * task,struct nfs_commit_data * data)5651 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5652 {
5653 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5654 &data->args.seq_args,
5655 &data->res.seq_res,
5656 task);
5657 }
5658
nfs4_commit_done_cb(struct rpc_task * task,struct nfs_commit_data * data)5659 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5660 {
5661 struct inode *inode = data->inode;
5662
5663 trace_nfs4_commit(data, task->tk_status);
5664 if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5665 NULL, NULL) == -EAGAIN) {
5666 rpc_restart_call_prepare(task);
5667 return -EAGAIN;
5668 }
5669 return 0;
5670 }
5671
nfs4_commit_done(struct rpc_task * task,struct nfs_commit_data * data)5672 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5673 {
5674 if (!nfs4_sequence_done(task, &data->res.seq_res))
5675 return -EAGAIN;
5676 return data->commit_done_cb(task, data);
5677 }
5678
nfs4_proc_commit_setup(struct nfs_commit_data * data,struct rpc_message * msg,struct rpc_clnt ** clnt)5679 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5680 struct rpc_clnt **clnt)
5681 {
5682 struct nfs_server *server = NFS_SERVER(data->inode);
5683
5684 if (data->commit_done_cb == NULL)
5685 data->commit_done_cb = nfs4_commit_done_cb;
5686 data->res.server = server;
5687 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5688 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5689 nfs4_state_protect(data->ds_clp ? data->ds_clp : server->nfs_client,
5690 NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5691 }
5692
_nfs4_proc_commit(struct file * dst,struct nfs_commitargs * args,struct nfs_commitres * res)5693 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5694 struct nfs_commitres *res)
5695 {
5696 struct inode *dst_inode = file_inode(dst);
5697 struct nfs_server *server = NFS_SERVER(dst_inode);
5698 struct rpc_message msg = {
5699 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5700 .rpc_argp = args,
5701 .rpc_resp = res,
5702 };
5703
5704 args->fh = NFS_FH(dst_inode);
5705 return nfs4_call_sync(server->client, server, &msg,
5706 &args->seq_args, &res->seq_res, 1);
5707 }
5708
nfs4_proc_commit(struct file * dst,__u64 offset,__u32 count,struct nfs_commitres * res)5709 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5710 {
5711 struct nfs_commitargs args = {
5712 .offset = offset,
5713 .count = count,
5714 };
5715 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5716 struct nfs4_exception exception = { };
5717 int status;
5718
5719 do {
5720 status = _nfs4_proc_commit(dst, &args, res);
5721 status = nfs4_handle_exception(dst_server, status, &exception);
5722 } while (exception.retry);
5723
5724 return status;
5725 }
5726
5727 struct nfs4_renewdata {
5728 struct nfs_client *client;
5729 unsigned long timestamp;
5730 };
5731
5732 /*
5733 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5734 * standalone procedure for queueing an asynchronous RENEW.
5735 */
nfs4_renew_release(void * calldata)5736 static void nfs4_renew_release(void *calldata)
5737 {
5738 struct nfs4_renewdata *data = calldata;
5739 struct nfs_client *clp = data->client;
5740
5741 if (refcount_read(&clp->cl_count) > 1)
5742 nfs4_schedule_state_renewal(clp);
5743 nfs_put_client(clp);
5744 kfree(data);
5745 }
5746
nfs4_renew_done(struct rpc_task * task,void * calldata)5747 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5748 {
5749 struct nfs4_renewdata *data = calldata;
5750 struct nfs_client *clp = data->client;
5751 unsigned long timestamp = data->timestamp;
5752
5753 trace_nfs4_renew_async(clp, task->tk_status);
5754 switch (task->tk_status) {
5755 case 0:
5756 break;
5757 case -NFS4ERR_LEASE_MOVED:
5758 nfs4_schedule_lease_moved_recovery(clp);
5759 break;
5760 default:
5761 /* Unless we're shutting down, schedule state recovery! */
5762 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5763 return;
5764 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5765 nfs4_schedule_lease_recovery(clp);
5766 return;
5767 }
5768 nfs4_schedule_path_down_recovery(clp);
5769 }
5770 do_renew_lease(clp, timestamp);
5771 }
5772
5773 static const struct rpc_call_ops nfs4_renew_ops = {
5774 .rpc_call_done = nfs4_renew_done,
5775 .rpc_release = nfs4_renew_release,
5776 };
5777
nfs4_proc_async_renew(struct nfs_client * clp,const struct cred * cred,unsigned renew_flags)5778 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5779 {
5780 struct rpc_message msg = {
5781 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5782 .rpc_argp = clp,
5783 .rpc_cred = cred,
5784 };
5785 struct nfs4_renewdata *data;
5786
5787 if (renew_flags == 0)
5788 return 0;
5789 if (!refcount_inc_not_zero(&clp->cl_count))
5790 return -EIO;
5791 data = kmalloc(sizeof(*data), GFP_NOFS);
5792 if (data == NULL) {
5793 nfs_put_client(clp);
5794 return -ENOMEM;
5795 }
5796 data->client = clp;
5797 data->timestamp = jiffies;
5798 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5799 &nfs4_renew_ops, data);
5800 }
5801
nfs4_proc_renew(struct nfs_client * clp,const struct cred * cred)5802 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5803 {
5804 struct rpc_message msg = {
5805 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5806 .rpc_argp = clp,
5807 .rpc_cred = cred,
5808 };
5809 unsigned long now = jiffies;
5810 int status;
5811
5812 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5813 if (status < 0)
5814 return status;
5815 do_renew_lease(clp, now);
5816 return 0;
5817 }
5818
nfs4_server_supports_acls(const struct nfs_server * server,enum nfs4_acl_type type)5819 static bool nfs4_server_supports_acls(const struct nfs_server *server,
5820 enum nfs4_acl_type type)
5821 {
5822 switch (type) {
5823 default:
5824 return server->attr_bitmask[0] & FATTR4_WORD0_ACL;
5825 case NFS4ACL_DACL:
5826 return server->attr_bitmask[1] & FATTR4_WORD1_DACL;
5827 case NFS4ACL_SACL:
5828 return server->attr_bitmask[1] & FATTR4_WORD1_SACL;
5829 }
5830 }
5831
5832 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5833 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5834 * the stack.
5835 */
5836 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5837
nfs4_buf_to_pages_noslab(const void * buf,size_t buflen,struct page ** pages)5838 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
5839 struct page **pages)
5840 {
5841 struct page *newpage, **spages;
5842 int rc = 0;
5843 size_t len;
5844 spages = pages;
5845
5846 do {
5847 len = min_t(size_t, PAGE_SIZE, buflen);
5848 newpage = alloc_page(GFP_KERNEL);
5849
5850 if (newpage == NULL)
5851 goto unwind;
5852 memcpy(page_address(newpage), buf, len);
5853 buf += len;
5854 buflen -= len;
5855 *pages++ = newpage;
5856 rc++;
5857 } while (buflen != 0);
5858
5859 return rc;
5860
5861 unwind:
5862 for(; rc > 0; rc--)
5863 __free_page(spages[rc-1]);
5864 return -ENOMEM;
5865 }
5866
5867 struct nfs4_cached_acl {
5868 enum nfs4_acl_type type;
5869 int cached;
5870 size_t len;
5871 char data[];
5872 };
5873
nfs4_set_cached_acl(struct inode * inode,struct nfs4_cached_acl * acl)5874 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5875 {
5876 struct nfs_inode *nfsi = NFS_I(inode);
5877
5878 spin_lock(&inode->i_lock);
5879 kfree(nfsi->nfs4_acl);
5880 nfsi->nfs4_acl = acl;
5881 spin_unlock(&inode->i_lock);
5882 }
5883
nfs4_zap_acl_attr(struct inode * inode)5884 static void nfs4_zap_acl_attr(struct inode *inode)
5885 {
5886 nfs4_set_cached_acl(inode, NULL);
5887 }
5888
nfs4_read_cached_acl(struct inode * inode,char * buf,size_t buflen,enum nfs4_acl_type type)5889 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf,
5890 size_t buflen, enum nfs4_acl_type type)
5891 {
5892 struct nfs_inode *nfsi = NFS_I(inode);
5893 struct nfs4_cached_acl *acl;
5894 int ret = -ENOENT;
5895
5896 spin_lock(&inode->i_lock);
5897 acl = nfsi->nfs4_acl;
5898 if (acl == NULL)
5899 goto out;
5900 if (acl->type != type)
5901 goto out;
5902 if (buf == NULL) /* user is just asking for length */
5903 goto out_len;
5904 if (acl->cached == 0)
5905 goto out;
5906 ret = -ERANGE; /* see getxattr(2) man page */
5907 if (acl->len > buflen)
5908 goto out;
5909 memcpy(buf, acl->data, acl->len);
5910 out_len:
5911 ret = acl->len;
5912 out:
5913 spin_unlock(&inode->i_lock);
5914 return ret;
5915 }
5916
nfs4_write_cached_acl(struct inode * inode,struct page ** pages,size_t pgbase,size_t acl_len,enum nfs4_acl_type type)5917 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages,
5918 size_t pgbase, size_t acl_len,
5919 enum nfs4_acl_type type)
5920 {
5921 struct nfs4_cached_acl *acl;
5922 size_t buflen = sizeof(*acl) + acl_len;
5923
5924 if (buflen <= PAGE_SIZE) {
5925 acl = kmalloc(buflen, GFP_KERNEL);
5926 if (acl == NULL)
5927 goto out;
5928 acl->cached = 1;
5929 _copy_from_pages(acl->data, pages, pgbase, acl_len);
5930 } else {
5931 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5932 if (acl == NULL)
5933 goto out;
5934 acl->cached = 0;
5935 }
5936 acl->type = type;
5937 acl->len = acl_len;
5938 out:
5939 nfs4_set_cached_acl(inode, acl);
5940 }
5941
5942 /*
5943 * The getxattr API returns the required buffer length when called with a
5944 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5945 * the required buf. On a NULL buf, we send a page of data to the server
5946 * guessing that the ACL request can be serviced by a page. If so, we cache
5947 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5948 * the cache. If not so, we throw away the page, and cache the required
5949 * length. The next getxattr call will then produce another round trip to
5950 * the server, this time with the input buf of the required size.
5951 */
__nfs4_get_acl_uncached(struct inode * inode,void * buf,size_t buflen,enum nfs4_acl_type type)5952 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf,
5953 size_t buflen, enum nfs4_acl_type type)
5954 {
5955 struct page **pages;
5956 struct nfs_getaclargs args = {
5957 .fh = NFS_FH(inode),
5958 .acl_type = type,
5959 .acl_len = buflen,
5960 };
5961 struct nfs_getaclres res = {
5962 .acl_type = type,
5963 .acl_len = buflen,
5964 };
5965 struct rpc_message msg = {
5966 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5967 .rpc_argp = &args,
5968 .rpc_resp = &res,
5969 };
5970 unsigned int npages;
5971 int ret = -ENOMEM, i;
5972 struct nfs_server *server = NFS_SERVER(inode);
5973
5974 if (buflen == 0)
5975 buflen = server->rsize;
5976
5977 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
5978 pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
5979 if (!pages)
5980 return -ENOMEM;
5981
5982 args.acl_pages = pages;
5983
5984 for (i = 0; i < npages; i++) {
5985 pages[i] = alloc_page(GFP_KERNEL);
5986 if (!pages[i])
5987 goto out_free;
5988 }
5989
5990 /* for decoding across pages */
5991 res.acl_scratch = alloc_page(GFP_KERNEL);
5992 if (!res.acl_scratch)
5993 goto out_free;
5994
5995 args.acl_len = npages * PAGE_SIZE;
5996
5997 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
5998 __func__, buf, buflen, npages, args.acl_len);
5999 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
6000 &msg, &args.seq_args, &res.seq_res, 0);
6001 if (ret)
6002 goto out_free;
6003
6004 /* Handle the case where the passed-in buffer is too short */
6005 if (res.acl_flags & NFS4_ACL_TRUNC) {
6006 /* Did the user only issue a request for the acl length? */
6007 if (buf == NULL)
6008 goto out_ok;
6009 ret = -ERANGE;
6010 goto out_free;
6011 }
6012 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len,
6013 type);
6014 if (buf) {
6015 if (res.acl_len > buflen) {
6016 ret = -ERANGE;
6017 goto out_free;
6018 }
6019 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
6020 }
6021 out_ok:
6022 ret = res.acl_len;
6023 out_free:
6024 while (--i >= 0)
6025 __free_page(pages[i]);
6026 if (res.acl_scratch)
6027 __free_page(res.acl_scratch);
6028 kfree(pages);
6029 return ret;
6030 }
6031
nfs4_get_acl_uncached(struct inode * inode,void * buf,size_t buflen,enum nfs4_acl_type type)6032 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf,
6033 size_t buflen, enum nfs4_acl_type type)
6034 {
6035 struct nfs4_exception exception = {
6036 .interruptible = true,
6037 };
6038 ssize_t ret;
6039 do {
6040 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type);
6041 trace_nfs4_get_acl(inode, ret);
6042 if (ret >= 0)
6043 break;
6044 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
6045 } while (exception.retry);
6046 return ret;
6047 }
6048
nfs4_proc_get_acl(struct inode * inode,void * buf,size_t buflen,enum nfs4_acl_type type)6049 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen,
6050 enum nfs4_acl_type type)
6051 {
6052 struct nfs_server *server = NFS_SERVER(inode);
6053 int ret;
6054
6055 if (!nfs4_server_supports_acls(server, type))
6056 return -EOPNOTSUPP;
6057 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
6058 if (ret < 0)
6059 return ret;
6060 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
6061 nfs_zap_acl_cache(inode);
6062 ret = nfs4_read_cached_acl(inode, buf, buflen, type);
6063 if (ret != -ENOENT)
6064 /* -ENOENT is returned if there is no ACL or if there is an ACL
6065 * but no cached acl data, just the acl length */
6066 return ret;
6067 return nfs4_get_acl_uncached(inode, buf, buflen, type);
6068 }
6069
__nfs4_proc_set_acl(struct inode * inode,const void * buf,size_t buflen,enum nfs4_acl_type type)6070 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf,
6071 size_t buflen, enum nfs4_acl_type type)
6072 {
6073 struct nfs_server *server = NFS_SERVER(inode);
6074 struct page *pages[NFS4ACL_MAXPAGES];
6075 struct nfs_setaclargs arg = {
6076 .fh = NFS_FH(inode),
6077 .acl_type = type,
6078 .acl_len = buflen,
6079 .acl_pages = pages,
6080 };
6081 struct nfs_setaclres res;
6082 struct rpc_message msg = {
6083 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
6084 .rpc_argp = &arg,
6085 .rpc_resp = &res,
6086 };
6087 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
6088 int ret, i;
6089
6090 /* You can't remove system.nfs4_acl: */
6091 if (buflen == 0)
6092 return -EINVAL;
6093 if (!nfs4_server_supports_acls(server, type))
6094 return -EOPNOTSUPP;
6095 if (npages > ARRAY_SIZE(pages))
6096 return -ERANGE;
6097 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
6098 if (i < 0)
6099 return i;
6100 nfs4_inode_make_writeable(inode);
6101 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6102
6103 /*
6104 * Free each page after tx, so the only ref left is
6105 * held by the network stack
6106 */
6107 for (; i > 0; i--)
6108 put_page(pages[i-1]);
6109
6110 /*
6111 * Acl update can result in inode attribute update.
6112 * so mark the attribute cache invalid.
6113 */
6114 spin_lock(&inode->i_lock);
6115 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
6116 NFS_INO_INVALID_CTIME |
6117 NFS_INO_REVAL_FORCED);
6118 spin_unlock(&inode->i_lock);
6119 nfs_access_zap_cache(inode);
6120 nfs_zap_acl_cache(inode);
6121 return ret;
6122 }
6123
nfs4_proc_set_acl(struct inode * inode,const void * buf,size_t buflen,enum nfs4_acl_type type)6124 static int nfs4_proc_set_acl(struct inode *inode, const void *buf,
6125 size_t buflen, enum nfs4_acl_type type)
6126 {
6127 struct nfs4_exception exception = { };
6128 int err;
6129 do {
6130 err = __nfs4_proc_set_acl(inode, buf, buflen, type);
6131 trace_nfs4_set_acl(inode, err);
6132 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) {
6133 /*
6134 * no need to retry since the kernel
6135 * isn't involved in encoding the ACEs.
6136 */
6137 err = -EINVAL;
6138 break;
6139 }
6140 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6141 &exception);
6142 } while (exception.retry);
6143 return err;
6144 }
6145
6146 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
_nfs4_get_security_label(struct inode * inode,void * buf,size_t buflen)6147 static int _nfs4_get_security_label(struct inode *inode, void *buf,
6148 size_t buflen)
6149 {
6150 struct nfs_server *server = NFS_SERVER(inode);
6151 struct nfs4_label label = {0, 0, buflen, buf};
6152
6153 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6154 struct nfs_fattr fattr = {
6155 .label = &label,
6156 };
6157 struct nfs4_getattr_arg arg = {
6158 .fh = NFS_FH(inode),
6159 .bitmask = bitmask,
6160 };
6161 struct nfs4_getattr_res res = {
6162 .fattr = &fattr,
6163 .server = server,
6164 };
6165 struct rpc_message msg = {
6166 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
6167 .rpc_argp = &arg,
6168 .rpc_resp = &res,
6169 };
6170 int ret;
6171
6172 nfs_fattr_init(&fattr);
6173
6174 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
6175 if (ret)
6176 return ret;
6177 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
6178 return -ENOENT;
6179 return label.len;
6180 }
6181
nfs4_get_security_label(struct inode * inode,void * buf,size_t buflen)6182 static int nfs4_get_security_label(struct inode *inode, void *buf,
6183 size_t buflen)
6184 {
6185 struct nfs4_exception exception = {
6186 .interruptible = true,
6187 };
6188 int err;
6189
6190 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6191 return -EOPNOTSUPP;
6192
6193 do {
6194 err = _nfs4_get_security_label(inode, buf, buflen);
6195 trace_nfs4_get_security_label(inode, err);
6196 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6197 &exception);
6198 } while (exception.retry);
6199 return err;
6200 }
6201
_nfs4_do_set_security_label(struct inode * inode,struct nfs4_label * ilabel,struct nfs_fattr * fattr)6202 static int _nfs4_do_set_security_label(struct inode *inode,
6203 struct nfs4_label *ilabel,
6204 struct nfs_fattr *fattr)
6205 {
6206
6207 struct iattr sattr = {0};
6208 struct nfs_server *server = NFS_SERVER(inode);
6209 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6210 struct nfs_setattrargs arg = {
6211 .fh = NFS_FH(inode),
6212 .iap = &sattr,
6213 .server = server,
6214 .bitmask = bitmask,
6215 .label = ilabel,
6216 };
6217 struct nfs_setattrres res = {
6218 .fattr = fattr,
6219 .server = server,
6220 };
6221 struct rpc_message msg = {
6222 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
6223 .rpc_argp = &arg,
6224 .rpc_resp = &res,
6225 };
6226 int status;
6227
6228 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
6229
6230 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6231 if (status)
6232 dprintk("%s failed: %d\n", __func__, status);
6233
6234 return status;
6235 }
6236
nfs4_do_set_security_label(struct inode * inode,struct nfs4_label * ilabel,struct nfs_fattr * fattr)6237 static int nfs4_do_set_security_label(struct inode *inode,
6238 struct nfs4_label *ilabel,
6239 struct nfs_fattr *fattr)
6240 {
6241 struct nfs4_exception exception = { };
6242 int err;
6243
6244 do {
6245 err = _nfs4_do_set_security_label(inode, ilabel, fattr);
6246 trace_nfs4_set_security_label(inode, err);
6247 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6248 &exception);
6249 } while (exception.retry);
6250 return err;
6251 }
6252
6253 static int
nfs4_set_security_label(struct inode * inode,const void * buf,size_t buflen)6254 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
6255 {
6256 struct nfs4_label ilabel = {0, 0, buflen, (char *)buf };
6257 struct nfs_fattr *fattr;
6258 int status;
6259
6260 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6261 return -EOPNOTSUPP;
6262
6263 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
6264 if (fattr == NULL)
6265 return -ENOMEM;
6266
6267 status = nfs4_do_set_security_label(inode, &ilabel, fattr);
6268 if (status == 0)
6269 nfs_setsecurity(inode, fattr);
6270
6271 return status;
6272 }
6273 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
6274
6275
nfs4_init_boot_verifier(const struct nfs_client * clp,nfs4_verifier * bootverf)6276 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
6277 nfs4_verifier *bootverf)
6278 {
6279 __be32 verf[2];
6280
6281 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
6282 /* An impossible timestamp guarantees this value
6283 * will never match a generated boot time. */
6284 verf[0] = cpu_to_be32(U32_MAX);
6285 verf[1] = cpu_to_be32(U32_MAX);
6286 } else {
6287 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6288 u64 ns = ktime_to_ns(nn->boot_time);
6289
6290 verf[0] = cpu_to_be32(ns >> 32);
6291 verf[1] = cpu_to_be32(ns);
6292 }
6293 memcpy(bootverf->data, verf, sizeof(bootverf->data));
6294 }
6295
6296 static size_t
nfs4_get_uniquifier(struct nfs_client * clp,char * buf,size_t buflen)6297 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen)
6298 {
6299 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6300 struct nfs_netns_client *nn_clp = nn->nfs_client;
6301 const char *id;
6302
6303 buf[0] = '\0';
6304
6305 if (nn_clp) {
6306 rcu_read_lock();
6307 id = rcu_dereference(nn_clp->identifier);
6308 if (id)
6309 strscpy(buf, id, buflen);
6310 rcu_read_unlock();
6311 }
6312
6313 if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0')
6314 strscpy(buf, nfs4_client_id_uniquifier, buflen);
6315
6316 return strlen(buf);
6317 }
6318
6319 static int
nfs4_init_nonuniform_client_string(struct nfs_client * clp)6320 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6321 {
6322 char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6323 size_t buflen;
6324 size_t len;
6325 char *str;
6326
6327 if (clp->cl_owner_id != NULL)
6328 return 0;
6329
6330 rcu_read_lock();
6331 len = 14 +
6332 strlen(clp->cl_rpcclient->cl_nodename) +
6333 1 +
6334 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6335 1;
6336 rcu_read_unlock();
6337
6338 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6339 if (buflen)
6340 len += buflen + 1;
6341
6342 if (len > NFS4_OPAQUE_LIMIT + 1)
6343 return -EINVAL;
6344
6345 /*
6346 * Since this string is allocated at mount time, and held until the
6347 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6348 * about a memory-reclaim deadlock.
6349 */
6350 str = kmalloc(len, GFP_KERNEL);
6351 if (!str)
6352 return -ENOMEM;
6353
6354 rcu_read_lock();
6355 if (buflen)
6356 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6357 clp->cl_rpcclient->cl_nodename, buf,
6358 rpc_peeraddr2str(clp->cl_rpcclient,
6359 RPC_DISPLAY_ADDR));
6360 else
6361 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6362 clp->cl_rpcclient->cl_nodename,
6363 rpc_peeraddr2str(clp->cl_rpcclient,
6364 RPC_DISPLAY_ADDR));
6365 rcu_read_unlock();
6366
6367 clp->cl_owner_id = str;
6368 return 0;
6369 }
6370
6371 static int
nfs4_init_uniform_client_string(struct nfs_client * clp)6372 nfs4_init_uniform_client_string(struct nfs_client *clp)
6373 {
6374 char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6375 size_t buflen;
6376 size_t len;
6377 char *str;
6378
6379 if (clp->cl_owner_id != NULL)
6380 return 0;
6381
6382 len = 10 + 10 + 1 + 10 + 1 +
6383 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6384
6385 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6386 if (buflen)
6387 len += buflen + 1;
6388
6389 if (len > NFS4_OPAQUE_LIMIT + 1)
6390 return -EINVAL;
6391
6392 /*
6393 * Since this string is allocated at mount time, and held until the
6394 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6395 * about a memory-reclaim deadlock.
6396 */
6397 str = kmalloc(len, GFP_KERNEL);
6398 if (!str)
6399 return -ENOMEM;
6400
6401 if (buflen)
6402 scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6403 clp->rpc_ops->version, clp->cl_minorversion,
6404 buf, clp->cl_rpcclient->cl_nodename);
6405 else
6406 scnprintf(str, len, "Linux NFSv%u.%u %s",
6407 clp->rpc_ops->version, clp->cl_minorversion,
6408 clp->cl_rpcclient->cl_nodename);
6409 clp->cl_owner_id = str;
6410 return 0;
6411 }
6412
6413 /*
6414 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6415 * services. Advertise one based on the address family of the
6416 * clientaddr.
6417 */
6418 static unsigned int
nfs4_init_callback_netid(const struct nfs_client * clp,char * buf,size_t len)6419 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6420 {
6421 if (strchr(clp->cl_ipaddr, ':') != NULL)
6422 return scnprintf(buf, len, "tcp6");
6423 else
6424 return scnprintf(buf, len, "tcp");
6425 }
6426
nfs4_setclientid_done(struct rpc_task * task,void * calldata)6427 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6428 {
6429 struct nfs4_setclientid *sc = calldata;
6430
6431 if (task->tk_status == 0)
6432 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6433 }
6434
6435 static const struct rpc_call_ops nfs4_setclientid_ops = {
6436 .rpc_call_done = nfs4_setclientid_done,
6437 };
6438
6439 /**
6440 * nfs4_proc_setclientid - Negotiate client ID
6441 * @clp: state data structure
6442 * @program: RPC program for NFSv4 callback service
6443 * @port: IP port number for NFS4 callback service
6444 * @cred: credential to use for this call
6445 * @res: where to place the result
6446 *
6447 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6448 */
nfs4_proc_setclientid(struct nfs_client * clp,u32 program,unsigned short port,const struct cred * cred,struct nfs4_setclientid_res * res)6449 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6450 unsigned short port, const struct cred *cred,
6451 struct nfs4_setclientid_res *res)
6452 {
6453 nfs4_verifier sc_verifier;
6454 struct nfs4_setclientid setclientid = {
6455 .sc_verifier = &sc_verifier,
6456 .sc_prog = program,
6457 .sc_clnt = clp,
6458 };
6459 struct rpc_message msg = {
6460 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6461 .rpc_argp = &setclientid,
6462 .rpc_resp = res,
6463 .rpc_cred = cred,
6464 };
6465 struct rpc_task_setup task_setup_data = {
6466 .rpc_client = clp->cl_rpcclient,
6467 .rpc_message = &msg,
6468 .callback_ops = &nfs4_setclientid_ops,
6469 .callback_data = &setclientid,
6470 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6471 };
6472 unsigned long now = jiffies;
6473 int status;
6474
6475 /* nfs_client_id4 */
6476 nfs4_init_boot_verifier(clp, &sc_verifier);
6477
6478 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6479 status = nfs4_init_uniform_client_string(clp);
6480 else
6481 status = nfs4_init_nonuniform_client_string(clp);
6482
6483 if (status)
6484 goto out;
6485
6486 /* cb_client4 */
6487 setclientid.sc_netid_len =
6488 nfs4_init_callback_netid(clp,
6489 setclientid.sc_netid,
6490 sizeof(setclientid.sc_netid));
6491 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6492 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6493 clp->cl_ipaddr, port >> 8, port & 255);
6494
6495 dprintk("NFS call setclientid auth=%s, '%s'\n",
6496 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6497 clp->cl_owner_id);
6498
6499 status = nfs4_call_sync_custom(&task_setup_data);
6500 if (setclientid.sc_cred) {
6501 kfree(clp->cl_acceptor);
6502 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6503 put_rpccred(setclientid.sc_cred);
6504 }
6505
6506 if (status == 0)
6507 do_renew_lease(clp, now);
6508 out:
6509 trace_nfs4_setclientid(clp, status);
6510 dprintk("NFS reply setclientid: %d\n", status);
6511 return status;
6512 }
6513
6514 /**
6515 * nfs4_proc_setclientid_confirm - Confirm client ID
6516 * @clp: state data structure
6517 * @arg: result of a previous SETCLIENTID
6518 * @cred: credential to use for this call
6519 *
6520 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6521 */
nfs4_proc_setclientid_confirm(struct nfs_client * clp,struct nfs4_setclientid_res * arg,const struct cred * cred)6522 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6523 struct nfs4_setclientid_res *arg,
6524 const struct cred *cred)
6525 {
6526 struct rpc_message msg = {
6527 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6528 .rpc_argp = arg,
6529 .rpc_cred = cred,
6530 };
6531 int status;
6532
6533 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
6534 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6535 clp->cl_clientid);
6536 status = rpc_call_sync(clp->cl_rpcclient, &msg,
6537 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6538 trace_nfs4_setclientid_confirm(clp, status);
6539 dprintk("NFS reply setclientid_confirm: %d\n", status);
6540 return status;
6541 }
6542
6543 struct nfs4_delegreturndata {
6544 struct nfs4_delegreturnargs args;
6545 struct nfs4_delegreturnres res;
6546 struct nfs_fh fh;
6547 nfs4_stateid stateid;
6548 unsigned long timestamp;
6549 struct {
6550 struct nfs4_layoutreturn_args arg;
6551 struct nfs4_layoutreturn_res res;
6552 struct nfs4_xdr_opaque_data ld_private;
6553 u32 roc_barrier;
6554 bool roc;
6555 } lr;
6556 struct nfs_fattr fattr;
6557 int rpc_status;
6558 struct inode *inode;
6559 };
6560
nfs4_delegreturn_done(struct rpc_task * task,void * calldata)6561 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6562 {
6563 struct nfs4_delegreturndata *data = calldata;
6564 struct nfs4_exception exception = {
6565 .inode = data->inode,
6566 .stateid = &data->stateid,
6567 .task_is_privileged = data->args.seq_args.sa_privileged,
6568 };
6569
6570 if (!nfs4_sequence_done(task, &data->res.seq_res))
6571 return;
6572
6573 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6574
6575 /* Handle Layoutreturn errors */
6576 if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res,
6577 &data->res.lr_ret) == -EAGAIN)
6578 goto out_restart;
6579
6580 switch (task->tk_status) {
6581 case 0:
6582 renew_lease(data->res.server, data->timestamp);
6583 break;
6584 case -NFS4ERR_ADMIN_REVOKED:
6585 case -NFS4ERR_DELEG_REVOKED:
6586 case -NFS4ERR_EXPIRED:
6587 nfs4_free_revoked_stateid(data->res.server,
6588 data->args.stateid,
6589 task->tk_msg.rpc_cred);
6590 fallthrough;
6591 case -NFS4ERR_BAD_STATEID:
6592 case -NFS4ERR_STALE_STATEID:
6593 case -ETIMEDOUT:
6594 task->tk_status = 0;
6595 break;
6596 case -NFS4ERR_OLD_STATEID:
6597 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6598 nfs4_stateid_seqid_inc(&data->stateid);
6599 if (data->args.bitmask) {
6600 data->args.bitmask = NULL;
6601 data->res.fattr = NULL;
6602 }
6603 goto out_restart;
6604 case -NFS4ERR_ACCESS:
6605 if (data->args.bitmask) {
6606 data->args.bitmask = NULL;
6607 data->res.fattr = NULL;
6608 goto out_restart;
6609 }
6610 fallthrough;
6611 default:
6612 task->tk_status = nfs4_async_handle_exception(task,
6613 data->res.server, task->tk_status,
6614 &exception);
6615 if (exception.retry)
6616 goto out_restart;
6617 }
6618 nfs_delegation_mark_returned(data->inode, data->args.stateid);
6619 data->rpc_status = task->tk_status;
6620 return;
6621 out_restart:
6622 task->tk_status = 0;
6623 rpc_restart_call_prepare(task);
6624 }
6625
nfs4_delegreturn_release(void * calldata)6626 static void nfs4_delegreturn_release(void *calldata)
6627 {
6628 struct nfs4_delegreturndata *data = calldata;
6629 struct inode *inode = data->inode;
6630
6631 if (data->lr.roc)
6632 pnfs_roc_release(&data->lr.arg, &data->lr.res,
6633 data->res.lr_ret);
6634 if (inode) {
6635 nfs4_fattr_set_prechange(&data->fattr,
6636 inode_peek_iversion_raw(inode));
6637 nfs_refresh_inode(inode, &data->fattr);
6638 nfs_iput_and_deactive(inode);
6639 }
6640 kfree(calldata);
6641 }
6642
nfs4_delegreturn_prepare(struct rpc_task * task,void * data)6643 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6644 {
6645 struct nfs4_delegreturndata *d_data;
6646 struct pnfs_layout_hdr *lo;
6647
6648 d_data = data;
6649
6650 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6651 nfs4_sequence_done(task, &d_data->res.seq_res);
6652 return;
6653 }
6654
6655 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6656 if (lo && !pnfs_layout_is_valid(lo)) {
6657 d_data->args.lr_args = NULL;
6658 d_data->res.lr_res = NULL;
6659 }
6660
6661 nfs4_setup_sequence(d_data->res.server->nfs_client,
6662 &d_data->args.seq_args,
6663 &d_data->res.seq_res,
6664 task);
6665 }
6666
6667 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6668 .rpc_call_prepare = nfs4_delegreturn_prepare,
6669 .rpc_call_done = nfs4_delegreturn_done,
6670 .rpc_release = nfs4_delegreturn_release,
6671 };
6672
_nfs4_proc_delegreturn(struct inode * inode,const struct cred * cred,const nfs4_stateid * stateid,int issync)6673 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6674 {
6675 struct nfs4_delegreturndata *data;
6676 struct nfs_server *server = NFS_SERVER(inode);
6677 struct rpc_task *task;
6678 struct rpc_message msg = {
6679 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6680 .rpc_cred = cred,
6681 };
6682 struct rpc_task_setup task_setup_data = {
6683 .rpc_client = server->client,
6684 .rpc_message = &msg,
6685 .callback_ops = &nfs4_delegreturn_ops,
6686 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6687 };
6688 int status = 0;
6689
6690 if (nfs_server_capable(inode, NFS_CAP_MOVEABLE))
6691 task_setup_data.flags |= RPC_TASK_MOVEABLE;
6692
6693 data = kzalloc(sizeof(*data), GFP_KERNEL);
6694 if (data == NULL)
6695 return -ENOMEM;
6696
6697 nfs4_state_protect(server->nfs_client,
6698 NFS_SP4_MACH_CRED_CLEANUP,
6699 &task_setup_data.rpc_client, &msg);
6700
6701 data->args.fhandle = &data->fh;
6702 data->args.stateid = &data->stateid;
6703 nfs4_bitmask_set(data->args.bitmask_store,
6704 server->cache_consistency_bitmask, inode, 0);
6705 data->args.bitmask = data->args.bitmask_store;
6706 nfs_copy_fh(&data->fh, NFS_FH(inode));
6707 nfs4_stateid_copy(&data->stateid, stateid);
6708 data->res.fattr = &data->fattr;
6709 data->res.server = server;
6710 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6711 data->lr.arg.ld_private = &data->lr.ld_private;
6712 nfs_fattr_init(data->res.fattr);
6713 data->timestamp = jiffies;
6714 data->rpc_status = 0;
6715 data->inode = nfs_igrab_and_active(inode);
6716 if (data->inode || issync) {
6717 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res,
6718 cred);
6719 if (data->lr.roc) {
6720 data->args.lr_args = &data->lr.arg;
6721 data->res.lr_res = &data->lr.res;
6722 }
6723 }
6724
6725 if (!data->inode)
6726 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6727 1);
6728 else
6729 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6730 0);
6731 task_setup_data.callback_data = data;
6732 msg.rpc_argp = &data->args;
6733 msg.rpc_resp = &data->res;
6734 task = rpc_run_task(&task_setup_data);
6735 if (IS_ERR(task))
6736 return PTR_ERR(task);
6737 if (!issync)
6738 goto out;
6739 status = rpc_wait_for_completion_task(task);
6740 if (status != 0)
6741 goto out;
6742 status = data->rpc_status;
6743 out:
6744 rpc_put_task(task);
6745 return status;
6746 }
6747
nfs4_proc_delegreturn(struct inode * inode,const struct cred * cred,const nfs4_stateid * stateid,int issync)6748 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6749 {
6750 struct nfs_server *server = NFS_SERVER(inode);
6751 struct nfs4_exception exception = { };
6752 int err;
6753 do {
6754 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
6755 trace_nfs4_delegreturn(inode, stateid, err);
6756 switch (err) {
6757 case -NFS4ERR_STALE_STATEID:
6758 case -NFS4ERR_EXPIRED:
6759 case 0:
6760 return 0;
6761 }
6762 err = nfs4_handle_exception(server, err, &exception);
6763 } while (exception.retry);
6764 return err;
6765 }
6766
_nfs4_proc_getlk(struct nfs4_state * state,int cmd,struct file_lock * request)6767 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6768 {
6769 struct inode *inode = state->inode;
6770 struct nfs_server *server = NFS_SERVER(inode);
6771 struct nfs_client *clp = server->nfs_client;
6772 struct nfs_lockt_args arg = {
6773 .fh = NFS_FH(inode),
6774 .fl = request,
6775 };
6776 struct nfs_lockt_res res = {
6777 .denied = request,
6778 };
6779 struct rpc_message msg = {
6780 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6781 .rpc_argp = &arg,
6782 .rpc_resp = &res,
6783 .rpc_cred = state->owner->so_cred,
6784 };
6785 struct nfs4_lock_state *lsp;
6786 int status;
6787
6788 arg.lock_owner.clientid = clp->cl_clientid;
6789 status = nfs4_set_lock_state(state, request);
6790 if (status != 0)
6791 goto out;
6792 lsp = request->fl_u.nfs4_fl.owner;
6793 arg.lock_owner.id = lsp->ls_seqid.owner_id;
6794 arg.lock_owner.s_dev = server->s_dev;
6795 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6796 switch (status) {
6797 case 0:
6798 request->fl_type = F_UNLCK;
6799 break;
6800 case -NFS4ERR_DENIED:
6801 status = 0;
6802 }
6803 request->fl_ops->fl_release_private(request);
6804 request->fl_ops = NULL;
6805 out:
6806 return status;
6807 }
6808
nfs4_proc_getlk(struct nfs4_state * state,int cmd,struct file_lock * request)6809 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6810 {
6811 struct nfs4_exception exception = {
6812 .interruptible = true,
6813 };
6814 int err;
6815
6816 do {
6817 err = _nfs4_proc_getlk(state, cmd, request);
6818 trace_nfs4_get_lock(request, state, cmd, err);
6819 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6820 &exception);
6821 } while (exception.retry);
6822 return err;
6823 }
6824
6825 /*
6826 * Update the seqid of a lock stateid after receiving
6827 * NFS4ERR_OLD_STATEID
6828 */
nfs4_refresh_lock_old_stateid(nfs4_stateid * dst,struct nfs4_lock_state * lsp)6829 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
6830 struct nfs4_lock_state *lsp)
6831 {
6832 struct nfs4_state *state = lsp->ls_state;
6833 bool ret = false;
6834
6835 spin_lock(&state->state_lock);
6836 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
6837 goto out;
6838 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
6839 nfs4_stateid_seqid_inc(dst);
6840 else
6841 dst->seqid = lsp->ls_stateid.seqid;
6842 ret = true;
6843 out:
6844 spin_unlock(&state->state_lock);
6845 return ret;
6846 }
6847
nfs4_sync_lock_stateid(nfs4_stateid * dst,struct nfs4_lock_state * lsp)6848 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
6849 struct nfs4_lock_state *lsp)
6850 {
6851 struct nfs4_state *state = lsp->ls_state;
6852 bool ret;
6853
6854 spin_lock(&state->state_lock);
6855 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
6856 nfs4_stateid_copy(dst, &lsp->ls_stateid);
6857 spin_unlock(&state->state_lock);
6858 return ret;
6859 }
6860
6861 struct nfs4_unlockdata {
6862 struct nfs_locku_args arg;
6863 struct nfs_locku_res res;
6864 struct nfs4_lock_state *lsp;
6865 struct nfs_open_context *ctx;
6866 struct nfs_lock_context *l_ctx;
6867 struct file_lock fl;
6868 struct nfs_server *server;
6869 unsigned long timestamp;
6870 };
6871
nfs4_alloc_unlockdata(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,struct nfs_seqid * seqid)6872 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
6873 struct nfs_open_context *ctx,
6874 struct nfs4_lock_state *lsp,
6875 struct nfs_seqid *seqid)
6876 {
6877 struct nfs4_unlockdata *p;
6878 struct nfs4_state *state = lsp->ls_state;
6879 struct inode *inode = state->inode;
6880
6881 p = kzalloc(sizeof(*p), GFP_KERNEL);
6882 if (p == NULL)
6883 return NULL;
6884 p->arg.fh = NFS_FH(inode);
6885 p->arg.fl = &p->fl;
6886 p->arg.seqid = seqid;
6887 p->res.seqid = seqid;
6888 p->lsp = lsp;
6889 /* Ensure we don't close file until we're done freeing locks! */
6890 p->ctx = get_nfs_open_context(ctx);
6891 p->l_ctx = nfs_get_lock_context(ctx);
6892 locks_init_lock(&p->fl);
6893 locks_copy_lock(&p->fl, fl);
6894 p->server = NFS_SERVER(inode);
6895 spin_lock(&state->state_lock);
6896 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
6897 spin_unlock(&state->state_lock);
6898 return p;
6899 }
6900
nfs4_locku_release_calldata(void * data)6901 static void nfs4_locku_release_calldata(void *data)
6902 {
6903 struct nfs4_unlockdata *calldata = data;
6904 nfs_free_seqid(calldata->arg.seqid);
6905 nfs4_put_lock_state(calldata->lsp);
6906 nfs_put_lock_context(calldata->l_ctx);
6907 put_nfs_open_context(calldata->ctx);
6908 kfree(calldata);
6909 }
6910
nfs4_locku_done(struct rpc_task * task,void * data)6911 static void nfs4_locku_done(struct rpc_task *task, void *data)
6912 {
6913 struct nfs4_unlockdata *calldata = data;
6914 struct nfs4_exception exception = {
6915 .inode = calldata->lsp->ls_state->inode,
6916 .stateid = &calldata->arg.stateid,
6917 };
6918
6919 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
6920 return;
6921 switch (task->tk_status) {
6922 case 0:
6923 renew_lease(calldata->server, calldata->timestamp);
6924 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
6925 if (nfs4_update_lock_stateid(calldata->lsp,
6926 &calldata->res.stateid))
6927 break;
6928 fallthrough;
6929 case -NFS4ERR_ADMIN_REVOKED:
6930 case -NFS4ERR_EXPIRED:
6931 nfs4_free_revoked_stateid(calldata->server,
6932 &calldata->arg.stateid,
6933 task->tk_msg.rpc_cred);
6934 fallthrough;
6935 case -NFS4ERR_BAD_STATEID:
6936 case -NFS4ERR_STALE_STATEID:
6937 if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
6938 calldata->lsp))
6939 rpc_restart_call_prepare(task);
6940 break;
6941 case -NFS4ERR_OLD_STATEID:
6942 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
6943 calldata->lsp))
6944 rpc_restart_call_prepare(task);
6945 break;
6946 default:
6947 task->tk_status = nfs4_async_handle_exception(task,
6948 calldata->server, task->tk_status,
6949 &exception);
6950 if (exception.retry)
6951 rpc_restart_call_prepare(task);
6952 }
6953 nfs_release_seqid(calldata->arg.seqid);
6954 }
6955
nfs4_locku_prepare(struct rpc_task * task,void * data)6956 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
6957 {
6958 struct nfs4_unlockdata *calldata = data;
6959
6960 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
6961 nfs_async_iocounter_wait(task, calldata->l_ctx))
6962 return;
6963
6964 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
6965 goto out_wait;
6966 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
6967 /* Note: exit _without_ running nfs4_locku_done */
6968 goto out_no_action;
6969 }
6970 calldata->timestamp = jiffies;
6971 if (nfs4_setup_sequence(calldata->server->nfs_client,
6972 &calldata->arg.seq_args,
6973 &calldata->res.seq_res,
6974 task) != 0)
6975 nfs_release_seqid(calldata->arg.seqid);
6976 return;
6977 out_no_action:
6978 task->tk_action = NULL;
6979 out_wait:
6980 nfs4_sequence_done(task, &calldata->res.seq_res);
6981 }
6982
6983 static const struct rpc_call_ops nfs4_locku_ops = {
6984 .rpc_call_prepare = nfs4_locku_prepare,
6985 .rpc_call_done = nfs4_locku_done,
6986 .rpc_release = nfs4_locku_release_calldata,
6987 };
6988
nfs4_do_unlck(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,struct nfs_seqid * seqid)6989 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
6990 struct nfs_open_context *ctx,
6991 struct nfs4_lock_state *lsp,
6992 struct nfs_seqid *seqid)
6993 {
6994 struct nfs4_unlockdata *data;
6995 struct rpc_message msg = {
6996 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
6997 .rpc_cred = ctx->cred,
6998 };
6999 struct rpc_task_setup task_setup_data = {
7000 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
7001 .rpc_message = &msg,
7002 .callback_ops = &nfs4_locku_ops,
7003 .workqueue = nfsiod_workqueue,
7004 .flags = RPC_TASK_ASYNC,
7005 };
7006
7007 if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE))
7008 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7009
7010 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
7011 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
7012
7013 /* Ensure this is an unlock - when canceling a lock, the
7014 * canceled lock is passed in, and it won't be an unlock.
7015 */
7016 fl->fl_type = F_UNLCK;
7017 if (fl->fl_flags & FL_CLOSE)
7018 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
7019
7020 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
7021 if (data == NULL) {
7022 nfs_free_seqid(seqid);
7023 return ERR_PTR(-ENOMEM);
7024 }
7025
7026 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
7027 msg.rpc_argp = &data->arg;
7028 msg.rpc_resp = &data->res;
7029 task_setup_data.callback_data = data;
7030 return rpc_run_task(&task_setup_data);
7031 }
7032
nfs4_proc_unlck(struct nfs4_state * state,int cmd,struct file_lock * request)7033 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
7034 {
7035 struct inode *inode = state->inode;
7036 struct nfs4_state_owner *sp = state->owner;
7037 struct nfs_inode *nfsi = NFS_I(inode);
7038 struct nfs_seqid *seqid;
7039 struct nfs4_lock_state *lsp;
7040 struct rpc_task *task;
7041 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7042 int status = 0;
7043 unsigned char fl_flags = request->fl_flags;
7044
7045 status = nfs4_set_lock_state(state, request);
7046 /* Unlock _before_ we do the RPC call */
7047 request->fl_flags |= FL_EXISTS;
7048 /* Exclude nfs_delegation_claim_locks() */
7049 mutex_lock(&sp->so_delegreturn_mutex);
7050 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
7051 down_read(&nfsi->rwsem);
7052 if (locks_lock_inode_wait(inode, request) == -ENOENT) {
7053 up_read(&nfsi->rwsem);
7054 mutex_unlock(&sp->so_delegreturn_mutex);
7055 goto out;
7056 }
7057 lsp = request->fl_u.nfs4_fl.owner;
7058 set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags);
7059 up_read(&nfsi->rwsem);
7060 mutex_unlock(&sp->so_delegreturn_mutex);
7061 if (status != 0)
7062 goto out;
7063 /* Is this a delegated lock? */
7064 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
7065 goto out;
7066 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
7067 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
7068 status = -ENOMEM;
7069 if (IS_ERR(seqid))
7070 goto out;
7071 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
7072 status = PTR_ERR(task);
7073 if (IS_ERR(task))
7074 goto out;
7075 status = rpc_wait_for_completion_task(task);
7076 rpc_put_task(task);
7077 out:
7078 request->fl_flags = fl_flags;
7079 trace_nfs4_unlock(request, state, F_SETLK, status);
7080 return status;
7081 }
7082
7083 struct nfs4_lockdata {
7084 struct nfs_lock_args arg;
7085 struct nfs_lock_res res;
7086 struct nfs4_lock_state *lsp;
7087 struct nfs_open_context *ctx;
7088 struct file_lock fl;
7089 unsigned long timestamp;
7090 int rpc_status;
7091 int cancelled;
7092 struct nfs_server *server;
7093 };
7094
nfs4_alloc_lockdata(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,gfp_t gfp_mask)7095 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
7096 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
7097 gfp_t gfp_mask)
7098 {
7099 struct nfs4_lockdata *p;
7100 struct inode *inode = lsp->ls_state->inode;
7101 struct nfs_server *server = NFS_SERVER(inode);
7102 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7103
7104 p = kzalloc(sizeof(*p), gfp_mask);
7105 if (p == NULL)
7106 return NULL;
7107
7108 p->arg.fh = NFS_FH(inode);
7109 p->arg.fl = &p->fl;
7110 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
7111 if (IS_ERR(p->arg.open_seqid))
7112 goto out_free;
7113 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
7114 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
7115 if (IS_ERR(p->arg.lock_seqid))
7116 goto out_free_seqid;
7117 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
7118 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
7119 p->arg.lock_owner.s_dev = server->s_dev;
7120 p->res.lock_seqid = p->arg.lock_seqid;
7121 p->lsp = lsp;
7122 p->server = server;
7123 p->ctx = get_nfs_open_context(ctx);
7124 locks_init_lock(&p->fl);
7125 locks_copy_lock(&p->fl, fl);
7126 return p;
7127 out_free_seqid:
7128 nfs_free_seqid(p->arg.open_seqid);
7129 out_free:
7130 kfree(p);
7131 return NULL;
7132 }
7133
nfs4_lock_prepare(struct rpc_task * task,void * calldata)7134 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
7135 {
7136 struct nfs4_lockdata *data = calldata;
7137 struct nfs4_state *state = data->lsp->ls_state;
7138
7139 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
7140 goto out_wait;
7141 /* Do we need to do an open_to_lock_owner? */
7142 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
7143 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
7144 goto out_release_lock_seqid;
7145 }
7146 nfs4_stateid_copy(&data->arg.open_stateid,
7147 &state->open_stateid);
7148 data->arg.new_lock_owner = 1;
7149 data->res.open_seqid = data->arg.open_seqid;
7150 } else {
7151 data->arg.new_lock_owner = 0;
7152 nfs4_stateid_copy(&data->arg.lock_stateid,
7153 &data->lsp->ls_stateid);
7154 }
7155 if (!nfs4_valid_open_stateid(state)) {
7156 data->rpc_status = -EBADF;
7157 task->tk_action = NULL;
7158 goto out_release_open_seqid;
7159 }
7160 data->timestamp = jiffies;
7161 if (nfs4_setup_sequence(data->server->nfs_client,
7162 &data->arg.seq_args,
7163 &data->res.seq_res,
7164 task) == 0)
7165 return;
7166 out_release_open_seqid:
7167 nfs_release_seqid(data->arg.open_seqid);
7168 out_release_lock_seqid:
7169 nfs_release_seqid(data->arg.lock_seqid);
7170 out_wait:
7171 nfs4_sequence_done(task, &data->res.seq_res);
7172 dprintk("%s: ret = %d\n", __func__, data->rpc_status);
7173 }
7174
nfs4_lock_done(struct rpc_task * task,void * calldata)7175 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
7176 {
7177 struct nfs4_lockdata *data = calldata;
7178 struct nfs4_lock_state *lsp = data->lsp;
7179
7180 if (!nfs4_sequence_done(task, &data->res.seq_res))
7181 return;
7182
7183 data->rpc_status = task->tk_status;
7184 switch (task->tk_status) {
7185 case 0:
7186 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
7187 data->timestamp);
7188 if (data->arg.new_lock && !data->cancelled) {
7189 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
7190 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
7191 goto out_restart;
7192 }
7193 if (data->arg.new_lock_owner != 0) {
7194 nfs_confirm_seqid(&lsp->ls_seqid, 0);
7195 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
7196 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
7197 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
7198 goto out_restart;
7199 break;
7200 case -NFS4ERR_OLD_STATEID:
7201 if (data->arg.new_lock_owner != 0 &&
7202 nfs4_refresh_open_old_stateid(&data->arg.open_stateid,
7203 lsp->ls_state))
7204 goto out_restart;
7205 if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp))
7206 goto out_restart;
7207 fallthrough;
7208 case -NFS4ERR_BAD_STATEID:
7209 case -NFS4ERR_STALE_STATEID:
7210 case -NFS4ERR_EXPIRED:
7211 if (data->arg.new_lock_owner != 0) {
7212 if (!nfs4_stateid_match(&data->arg.open_stateid,
7213 &lsp->ls_state->open_stateid))
7214 goto out_restart;
7215 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
7216 &lsp->ls_stateid))
7217 goto out_restart;
7218 }
7219 out_done:
7220 dprintk("%s: ret = %d!\n", __func__, data->rpc_status);
7221 return;
7222 out_restart:
7223 if (!data->cancelled)
7224 rpc_restart_call_prepare(task);
7225 goto out_done;
7226 }
7227
nfs4_lock_release(void * calldata)7228 static void nfs4_lock_release(void *calldata)
7229 {
7230 struct nfs4_lockdata *data = calldata;
7231
7232 nfs_free_seqid(data->arg.open_seqid);
7233 if (data->cancelled && data->rpc_status == 0) {
7234 struct rpc_task *task;
7235 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
7236 data->arg.lock_seqid);
7237 if (!IS_ERR(task))
7238 rpc_put_task_async(task);
7239 dprintk("%s: cancelling lock!\n", __func__);
7240 } else
7241 nfs_free_seqid(data->arg.lock_seqid);
7242 nfs4_put_lock_state(data->lsp);
7243 put_nfs_open_context(data->ctx);
7244 kfree(data);
7245 }
7246
7247 static const struct rpc_call_ops nfs4_lock_ops = {
7248 .rpc_call_prepare = nfs4_lock_prepare,
7249 .rpc_call_done = nfs4_lock_done,
7250 .rpc_release = nfs4_lock_release,
7251 };
7252
nfs4_handle_setlk_error(struct nfs_server * server,struct nfs4_lock_state * lsp,int new_lock_owner,int error)7253 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
7254 {
7255 switch (error) {
7256 case -NFS4ERR_ADMIN_REVOKED:
7257 case -NFS4ERR_EXPIRED:
7258 case -NFS4ERR_BAD_STATEID:
7259 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7260 if (new_lock_owner != 0 ||
7261 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
7262 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
7263 break;
7264 case -NFS4ERR_STALE_STATEID:
7265 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7266 nfs4_schedule_lease_recovery(server->nfs_client);
7267 }
7268 }
7269
_nfs4_do_setlk(struct nfs4_state * state,int cmd,struct file_lock * fl,int recovery_type)7270 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
7271 {
7272 struct nfs4_lockdata *data;
7273 struct rpc_task *task;
7274 struct rpc_message msg = {
7275 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
7276 .rpc_cred = state->owner->so_cred,
7277 };
7278 struct rpc_task_setup task_setup_data = {
7279 .rpc_client = NFS_CLIENT(state->inode),
7280 .rpc_message = &msg,
7281 .callback_ops = &nfs4_lock_ops,
7282 .workqueue = nfsiod_workqueue,
7283 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
7284 };
7285 int ret;
7286
7287 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
7288 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7289
7290 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
7291 fl->fl_u.nfs4_fl.owner, GFP_KERNEL);
7292 if (data == NULL)
7293 return -ENOMEM;
7294 if (IS_SETLKW(cmd))
7295 data->arg.block = 1;
7296 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
7297 recovery_type > NFS_LOCK_NEW);
7298 msg.rpc_argp = &data->arg;
7299 msg.rpc_resp = &data->res;
7300 task_setup_data.callback_data = data;
7301 if (recovery_type > NFS_LOCK_NEW) {
7302 if (recovery_type == NFS_LOCK_RECLAIM)
7303 data->arg.reclaim = NFS_LOCK_RECLAIM;
7304 } else
7305 data->arg.new_lock = 1;
7306 task = rpc_run_task(&task_setup_data);
7307 if (IS_ERR(task))
7308 return PTR_ERR(task);
7309 ret = rpc_wait_for_completion_task(task);
7310 if (ret == 0) {
7311 ret = data->rpc_status;
7312 if (ret)
7313 nfs4_handle_setlk_error(data->server, data->lsp,
7314 data->arg.new_lock_owner, ret);
7315 } else
7316 data->cancelled = true;
7317 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7318 rpc_put_task(task);
7319 dprintk("%s: ret = %d\n", __func__, ret);
7320 return ret;
7321 }
7322
nfs4_lock_reclaim(struct nfs4_state * state,struct file_lock * request)7323 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7324 {
7325 struct nfs_server *server = NFS_SERVER(state->inode);
7326 struct nfs4_exception exception = {
7327 .inode = state->inode,
7328 };
7329 int err;
7330
7331 do {
7332 /* Cache the lock if possible... */
7333 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7334 return 0;
7335 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7336 if (err != -NFS4ERR_DELAY)
7337 break;
7338 nfs4_handle_exception(server, err, &exception);
7339 } while (exception.retry);
7340 return err;
7341 }
7342
nfs4_lock_expired(struct nfs4_state * state,struct file_lock * request)7343 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7344 {
7345 struct nfs_server *server = NFS_SERVER(state->inode);
7346 struct nfs4_exception exception = {
7347 .inode = state->inode,
7348 };
7349 int err;
7350
7351 err = nfs4_set_lock_state(state, request);
7352 if (err != 0)
7353 return err;
7354 if (!recover_lost_locks) {
7355 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7356 return 0;
7357 }
7358 do {
7359 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7360 return 0;
7361 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7362 switch (err) {
7363 default:
7364 goto out;
7365 case -NFS4ERR_GRACE:
7366 case -NFS4ERR_DELAY:
7367 nfs4_handle_exception(server, err, &exception);
7368 err = 0;
7369 }
7370 } while (exception.retry);
7371 out:
7372 return err;
7373 }
7374
7375 #if defined(CONFIG_NFS_V4_1)
nfs41_lock_expired(struct nfs4_state * state,struct file_lock * request)7376 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7377 {
7378 struct nfs4_lock_state *lsp;
7379 int status;
7380
7381 status = nfs4_set_lock_state(state, request);
7382 if (status != 0)
7383 return status;
7384 lsp = request->fl_u.nfs4_fl.owner;
7385 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7386 test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7387 return 0;
7388 return nfs4_lock_expired(state, request);
7389 }
7390 #endif
7391
_nfs4_proc_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7392 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7393 {
7394 struct nfs_inode *nfsi = NFS_I(state->inode);
7395 struct nfs4_state_owner *sp = state->owner;
7396 unsigned char fl_flags = request->fl_flags;
7397 int status;
7398
7399 request->fl_flags |= FL_ACCESS;
7400 status = locks_lock_inode_wait(state->inode, request);
7401 if (status < 0)
7402 goto out;
7403 mutex_lock(&sp->so_delegreturn_mutex);
7404 down_read(&nfsi->rwsem);
7405 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7406 /* Yes: cache locks! */
7407 /* ...but avoid races with delegation recall... */
7408 request->fl_flags = fl_flags & ~FL_SLEEP;
7409 status = locks_lock_inode_wait(state->inode, request);
7410 up_read(&nfsi->rwsem);
7411 mutex_unlock(&sp->so_delegreturn_mutex);
7412 goto out;
7413 }
7414 up_read(&nfsi->rwsem);
7415 mutex_unlock(&sp->so_delegreturn_mutex);
7416 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7417 out:
7418 request->fl_flags = fl_flags;
7419 return status;
7420 }
7421
nfs4_proc_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7422 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7423 {
7424 struct nfs4_exception exception = {
7425 .state = state,
7426 .inode = state->inode,
7427 .interruptible = true,
7428 };
7429 int err;
7430
7431 do {
7432 err = _nfs4_proc_setlk(state, cmd, request);
7433 if (err == -NFS4ERR_DENIED)
7434 err = -EAGAIN;
7435 err = nfs4_handle_exception(NFS_SERVER(state->inode),
7436 err, &exception);
7437 } while (exception.retry);
7438 return err;
7439 }
7440
7441 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7442 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7443
7444 static int
nfs4_retry_setlk_simple(struct nfs4_state * state,int cmd,struct file_lock * request)7445 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7446 struct file_lock *request)
7447 {
7448 int status = -ERESTARTSYS;
7449 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
7450
7451 while(!signalled()) {
7452 status = nfs4_proc_setlk(state, cmd, request);
7453 if ((status != -EAGAIN) || IS_SETLK(cmd))
7454 break;
7455 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE);
7456 schedule_timeout(timeout);
7457 timeout *= 2;
7458 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7459 status = -ERESTARTSYS;
7460 }
7461 return status;
7462 }
7463
7464 #ifdef CONFIG_NFS_V4_1
7465 struct nfs4_lock_waiter {
7466 struct inode *inode;
7467 struct nfs_lowner owner;
7468 wait_queue_entry_t wait;
7469 };
7470
7471 static int
nfs4_wake_lock_waiter(wait_queue_entry_t * wait,unsigned int mode,int flags,void * key)7472 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7473 {
7474 struct nfs4_lock_waiter *waiter =
7475 container_of(wait, struct nfs4_lock_waiter, wait);
7476
7477 /* NULL key means to wake up everyone */
7478 if (key) {
7479 struct cb_notify_lock_args *cbnl = key;
7480 struct nfs_lowner *lowner = &cbnl->cbnl_owner,
7481 *wowner = &waiter->owner;
7482
7483 /* Only wake if the callback was for the same owner. */
7484 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7485 return 0;
7486
7487 /* Make sure it's for the right inode */
7488 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7489 return 0;
7490 }
7491
7492 return woken_wake_function(wait, mode, flags, key);
7493 }
7494
7495 static int
nfs4_retry_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7496 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7497 {
7498 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7499 struct nfs_server *server = NFS_SERVER(state->inode);
7500 struct nfs_client *clp = server->nfs_client;
7501 wait_queue_head_t *q = &clp->cl_lock_waitq;
7502 struct nfs4_lock_waiter waiter = {
7503 .inode = state->inode,
7504 .owner = { .clientid = clp->cl_clientid,
7505 .id = lsp->ls_seqid.owner_id,
7506 .s_dev = server->s_dev },
7507 };
7508 int status;
7509
7510 /* Don't bother with waitqueue if we don't expect a callback */
7511 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7512 return nfs4_retry_setlk_simple(state, cmd, request);
7513
7514 init_wait(&waiter.wait);
7515 waiter.wait.func = nfs4_wake_lock_waiter;
7516 add_wait_queue(q, &waiter.wait);
7517
7518 do {
7519 status = nfs4_proc_setlk(state, cmd, request);
7520 if (status != -EAGAIN || IS_SETLK(cmd))
7521 break;
7522
7523 status = -ERESTARTSYS;
7524 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE,
7525 NFS4_LOCK_MAXTIMEOUT);
7526 } while (!signalled());
7527
7528 remove_wait_queue(q, &waiter.wait);
7529
7530 return status;
7531 }
7532 #else /* !CONFIG_NFS_V4_1 */
7533 static inline int
nfs4_retry_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7534 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7535 {
7536 return nfs4_retry_setlk_simple(state, cmd, request);
7537 }
7538 #endif
7539
7540 static int
nfs4_proc_lock(struct file * filp,int cmd,struct file_lock * request)7541 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7542 {
7543 struct nfs_open_context *ctx;
7544 struct nfs4_state *state;
7545 int status;
7546
7547 /* verify open state */
7548 ctx = nfs_file_open_context(filp);
7549 state = ctx->state;
7550
7551 if (IS_GETLK(cmd)) {
7552 if (state != NULL)
7553 return nfs4_proc_getlk(state, F_GETLK, request);
7554 return 0;
7555 }
7556
7557 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7558 return -EINVAL;
7559
7560 if (request->fl_type == F_UNLCK) {
7561 if (state != NULL)
7562 return nfs4_proc_unlck(state, cmd, request);
7563 return 0;
7564 }
7565
7566 if (state == NULL)
7567 return -ENOLCK;
7568
7569 if ((request->fl_flags & FL_POSIX) &&
7570 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7571 return -ENOLCK;
7572
7573 /*
7574 * Don't rely on the VFS having checked the file open mode,
7575 * since it won't do this for flock() locks.
7576 */
7577 switch (request->fl_type) {
7578 case F_RDLCK:
7579 if (!(filp->f_mode & FMODE_READ))
7580 return -EBADF;
7581 break;
7582 case F_WRLCK:
7583 if (!(filp->f_mode & FMODE_WRITE))
7584 return -EBADF;
7585 }
7586
7587 status = nfs4_set_lock_state(state, request);
7588 if (status != 0)
7589 return status;
7590
7591 return nfs4_retry_setlk(state, cmd, request);
7592 }
7593
nfs4_delete_lease(struct file * file,void ** priv)7594 static int nfs4_delete_lease(struct file *file, void **priv)
7595 {
7596 return generic_setlease(file, F_UNLCK, NULL, priv);
7597 }
7598
nfs4_add_lease(struct file * file,int arg,struct file_lock ** lease,void ** priv)7599 static int nfs4_add_lease(struct file *file, int arg, struct file_lock **lease,
7600 void **priv)
7601 {
7602 struct inode *inode = file_inode(file);
7603 fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE;
7604 int ret;
7605
7606 /* No delegation, no lease */
7607 if (!nfs4_have_delegation(inode, type))
7608 return -EAGAIN;
7609 ret = generic_setlease(file, arg, lease, priv);
7610 if (ret || nfs4_have_delegation(inode, type))
7611 return ret;
7612 /* We raced with a delegation return */
7613 nfs4_delete_lease(file, priv);
7614 return -EAGAIN;
7615 }
7616
nfs4_proc_setlease(struct file * file,int arg,struct file_lock ** lease,void ** priv)7617 int nfs4_proc_setlease(struct file *file, int arg, struct file_lock **lease,
7618 void **priv)
7619 {
7620 switch (arg) {
7621 case F_RDLCK:
7622 case F_WRLCK:
7623 return nfs4_add_lease(file, arg, lease, priv);
7624 case F_UNLCK:
7625 return nfs4_delete_lease(file, priv);
7626 default:
7627 return -EINVAL;
7628 }
7629 }
7630
nfs4_lock_delegation_recall(struct file_lock * fl,struct nfs4_state * state,const nfs4_stateid * stateid)7631 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7632 {
7633 struct nfs_server *server = NFS_SERVER(state->inode);
7634 int err;
7635
7636 err = nfs4_set_lock_state(state, fl);
7637 if (err != 0)
7638 return err;
7639 do {
7640 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7641 if (err != -NFS4ERR_DELAY)
7642 break;
7643 ssleep(1);
7644 } while (err == -NFS4ERR_DELAY);
7645 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7646 }
7647
7648 struct nfs_release_lockowner_data {
7649 struct nfs4_lock_state *lsp;
7650 struct nfs_server *server;
7651 struct nfs_release_lockowner_args args;
7652 struct nfs_release_lockowner_res res;
7653 unsigned long timestamp;
7654 };
7655
nfs4_release_lockowner_prepare(struct rpc_task * task,void * calldata)7656 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7657 {
7658 struct nfs_release_lockowner_data *data = calldata;
7659 struct nfs_server *server = data->server;
7660 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7661 &data->res.seq_res, task);
7662 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7663 data->timestamp = jiffies;
7664 }
7665
nfs4_release_lockowner_done(struct rpc_task * task,void * calldata)7666 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7667 {
7668 struct nfs_release_lockowner_data *data = calldata;
7669 struct nfs_server *server = data->server;
7670
7671 nfs40_sequence_done(task, &data->res.seq_res);
7672
7673 switch (task->tk_status) {
7674 case 0:
7675 renew_lease(server, data->timestamp);
7676 break;
7677 case -NFS4ERR_STALE_CLIENTID:
7678 case -NFS4ERR_EXPIRED:
7679 nfs4_schedule_lease_recovery(server->nfs_client);
7680 break;
7681 case -NFS4ERR_LEASE_MOVED:
7682 case -NFS4ERR_DELAY:
7683 if (nfs4_async_handle_error(task, server,
7684 NULL, NULL) == -EAGAIN)
7685 rpc_restart_call_prepare(task);
7686 }
7687 }
7688
nfs4_release_lockowner_release(void * calldata)7689 static void nfs4_release_lockowner_release(void *calldata)
7690 {
7691 struct nfs_release_lockowner_data *data = calldata;
7692 nfs4_free_lock_state(data->server, data->lsp);
7693 kfree(calldata);
7694 }
7695
7696 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7697 .rpc_call_prepare = nfs4_release_lockowner_prepare,
7698 .rpc_call_done = nfs4_release_lockowner_done,
7699 .rpc_release = nfs4_release_lockowner_release,
7700 };
7701
7702 static void
nfs4_release_lockowner(struct nfs_server * server,struct nfs4_lock_state * lsp)7703 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7704 {
7705 struct nfs_release_lockowner_data *data;
7706 struct rpc_message msg = {
7707 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7708 };
7709
7710 if (server->nfs_client->cl_mvops->minor_version != 0)
7711 return;
7712
7713 data = kmalloc(sizeof(*data), GFP_KERNEL);
7714 if (!data)
7715 return;
7716 data->lsp = lsp;
7717 data->server = server;
7718 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7719 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7720 data->args.lock_owner.s_dev = server->s_dev;
7721
7722 msg.rpc_argp = &data->args;
7723 msg.rpc_resp = &data->res;
7724 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7725 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7726 }
7727
7728 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7729
nfs4_xattr_set_nfs4_acl(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7730 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7731 struct mnt_idmap *idmap,
7732 struct dentry *unused, struct inode *inode,
7733 const char *key, const void *buf,
7734 size_t buflen, int flags)
7735 {
7736 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL);
7737 }
7738
nfs4_xattr_get_nfs4_acl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7739 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7740 struct dentry *unused, struct inode *inode,
7741 const char *key, void *buf, size_t buflen)
7742 {
7743 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL);
7744 }
7745
nfs4_xattr_list_nfs4_acl(struct dentry * dentry)7746 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7747 {
7748 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL);
7749 }
7750
7751 #if defined(CONFIG_NFS_V4_1)
7752 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl"
7753
nfs4_xattr_set_nfs4_dacl(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7754 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler,
7755 struct mnt_idmap *idmap,
7756 struct dentry *unused, struct inode *inode,
7757 const char *key, const void *buf,
7758 size_t buflen, int flags)
7759 {
7760 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL);
7761 }
7762
nfs4_xattr_get_nfs4_dacl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7763 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler,
7764 struct dentry *unused, struct inode *inode,
7765 const char *key, void *buf, size_t buflen)
7766 {
7767 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL);
7768 }
7769
nfs4_xattr_list_nfs4_dacl(struct dentry * dentry)7770 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry)
7771 {
7772 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL);
7773 }
7774
7775 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl"
7776
nfs4_xattr_set_nfs4_sacl(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7777 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler,
7778 struct mnt_idmap *idmap,
7779 struct dentry *unused, struct inode *inode,
7780 const char *key, const void *buf,
7781 size_t buflen, int flags)
7782 {
7783 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL);
7784 }
7785
nfs4_xattr_get_nfs4_sacl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7786 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler,
7787 struct dentry *unused, struct inode *inode,
7788 const char *key, void *buf, size_t buflen)
7789 {
7790 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL);
7791 }
7792
nfs4_xattr_list_nfs4_sacl(struct dentry * dentry)7793 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry)
7794 {
7795 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL);
7796 }
7797
7798 #endif
7799
7800 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7801
nfs4_xattr_set_nfs4_label(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7802 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7803 struct mnt_idmap *idmap,
7804 struct dentry *unused, struct inode *inode,
7805 const char *key, const void *buf,
7806 size_t buflen, int flags)
7807 {
7808 if (security_ismaclabel(key))
7809 return nfs4_set_security_label(inode, buf, buflen);
7810
7811 return -EOPNOTSUPP;
7812 }
7813
nfs4_xattr_get_nfs4_label(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7814 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7815 struct dentry *unused, struct inode *inode,
7816 const char *key, void *buf, size_t buflen)
7817 {
7818 if (security_ismaclabel(key))
7819 return nfs4_get_security_label(inode, buf, buflen);
7820 return -EOPNOTSUPP;
7821 }
7822
7823 static ssize_t
nfs4_listxattr_nfs4_label(struct inode * inode,char * list,size_t list_len)7824 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7825 {
7826 int len = 0;
7827
7828 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7829 len = security_inode_listsecurity(inode, list, list_len);
7830 if (len >= 0 && list_len && len > list_len)
7831 return -ERANGE;
7832 }
7833 return len;
7834 }
7835
7836 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7837 .prefix = XATTR_SECURITY_PREFIX,
7838 .get = nfs4_xattr_get_nfs4_label,
7839 .set = nfs4_xattr_set_nfs4_label,
7840 };
7841
7842 #else
7843
7844 static ssize_t
nfs4_listxattr_nfs4_label(struct inode * inode,char * list,size_t list_len)7845 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7846 {
7847 return 0;
7848 }
7849
7850 #endif
7851
7852 #ifdef CONFIG_NFS_V4_2
nfs4_xattr_set_nfs4_user(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7853 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
7854 struct mnt_idmap *idmap,
7855 struct dentry *unused, struct inode *inode,
7856 const char *key, const void *buf,
7857 size_t buflen, int flags)
7858 {
7859 u32 mask;
7860 int ret;
7861
7862 if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7863 return -EOPNOTSUPP;
7864
7865 /*
7866 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
7867 * flags right now. Handling of xattr operations use the normal
7868 * file read/write permissions.
7869 *
7870 * Just in case the server has other ideas (which RFC 8276 allows),
7871 * do a cached access check for the XA* flags to possibly avoid
7872 * doing an RPC and getting EACCES back.
7873 */
7874 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7875 if (!(mask & NFS_ACCESS_XAWRITE))
7876 return -EACCES;
7877 }
7878
7879 if (buf == NULL) {
7880 ret = nfs42_proc_removexattr(inode, key);
7881 if (!ret)
7882 nfs4_xattr_cache_remove(inode, key);
7883 } else {
7884 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
7885 if (!ret)
7886 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
7887 }
7888
7889 return ret;
7890 }
7891
nfs4_xattr_get_nfs4_user(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7892 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
7893 struct dentry *unused, struct inode *inode,
7894 const char *key, void *buf, size_t buflen)
7895 {
7896 u32 mask;
7897 ssize_t ret;
7898
7899 if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7900 return -EOPNOTSUPP;
7901
7902 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7903 if (!(mask & NFS_ACCESS_XAREAD))
7904 return -EACCES;
7905 }
7906
7907 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7908 if (ret)
7909 return ret;
7910
7911 ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
7912 if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7913 return ret;
7914
7915 ret = nfs42_proc_getxattr(inode, key, buf, buflen);
7916
7917 return ret;
7918 }
7919
7920 static ssize_t
nfs4_listxattr_nfs4_user(struct inode * inode,char * list,size_t list_len)7921 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7922 {
7923 u64 cookie;
7924 bool eof;
7925 ssize_t ret, size;
7926 char *buf;
7927 size_t buflen;
7928 u32 mask;
7929
7930 if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7931 return 0;
7932
7933 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7934 if (!(mask & NFS_ACCESS_XALIST))
7935 return 0;
7936 }
7937
7938 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7939 if (ret)
7940 return ret;
7941
7942 ret = nfs4_xattr_cache_list(inode, list, list_len);
7943 if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7944 return ret;
7945
7946 cookie = 0;
7947 eof = false;
7948 buflen = list_len ? list_len : XATTR_LIST_MAX;
7949 buf = list_len ? list : NULL;
7950 size = 0;
7951
7952 while (!eof) {
7953 ret = nfs42_proc_listxattrs(inode, buf, buflen,
7954 &cookie, &eof);
7955 if (ret < 0)
7956 return ret;
7957
7958 if (list_len) {
7959 buf += ret;
7960 buflen -= ret;
7961 }
7962 size += ret;
7963 }
7964
7965 if (list_len)
7966 nfs4_xattr_cache_set_list(inode, list, size);
7967
7968 return size;
7969 }
7970
7971 #else
7972
7973 static ssize_t
nfs4_listxattr_nfs4_user(struct inode * inode,char * list,size_t list_len)7974 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7975 {
7976 return 0;
7977 }
7978 #endif /* CONFIG_NFS_V4_2 */
7979
7980 /*
7981 * nfs_fhget will use either the mounted_on_fileid or the fileid
7982 */
nfs_fixup_referral_attributes(struct nfs_fattr * fattr)7983 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
7984 {
7985 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
7986 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
7987 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
7988 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
7989 return;
7990
7991 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
7992 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
7993 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
7994 fattr->nlink = 2;
7995 }
7996
_nfs4_proc_fs_locations(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs4_fs_locations * fs_locations,struct page * page)7997 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7998 const struct qstr *name,
7999 struct nfs4_fs_locations *fs_locations,
8000 struct page *page)
8001 {
8002 struct nfs_server *server = NFS_SERVER(dir);
8003 u32 bitmask[3];
8004 struct nfs4_fs_locations_arg args = {
8005 .dir_fh = NFS_FH(dir),
8006 .name = name,
8007 .page = page,
8008 .bitmask = bitmask,
8009 };
8010 struct nfs4_fs_locations_res res = {
8011 .fs_locations = fs_locations,
8012 };
8013 struct rpc_message msg = {
8014 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8015 .rpc_argp = &args,
8016 .rpc_resp = &res,
8017 };
8018 int status;
8019
8020 dprintk("%s: start\n", __func__);
8021
8022 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
8023 bitmask[1] = nfs4_fattr_bitmap[1];
8024
8025 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
8026 * is not supported */
8027 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
8028 bitmask[0] &= ~FATTR4_WORD0_FILEID;
8029 else
8030 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
8031
8032 nfs_fattr_init(fs_locations->fattr);
8033 fs_locations->server = server;
8034 fs_locations->nlocations = 0;
8035 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
8036 dprintk("%s: returned status = %d\n", __func__, status);
8037 return status;
8038 }
8039
nfs4_proc_fs_locations(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs4_fs_locations * fs_locations,struct page * page)8040 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8041 const struct qstr *name,
8042 struct nfs4_fs_locations *fs_locations,
8043 struct page *page)
8044 {
8045 struct nfs4_exception exception = {
8046 .interruptible = true,
8047 };
8048 int err;
8049 do {
8050 err = _nfs4_proc_fs_locations(client, dir, name,
8051 fs_locations, page);
8052 trace_nfs4_get_fs_locations(dir, name, err);
8053 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8054 &exception);
8055 } while (exception.retry);
8056 return err;
8057 }
8058
8059 /*
8060 * This operation also signals the server that this client is
8061 * performing migration recovery. The server can stop returning
8062 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is
8063 * appended to this compound to identify the client ID which is
8064 * performing recovery.
8065 */
_nfs40_proc_get_locations(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)8066 static int _nfs40_proc_get_locations(struct nfs_server *server,
8067 struct nfs_fh *fhandle,
8068 struct nfs4_fs_locations *locations,
8069 struct page *page, const struct cred *cred)
8070 {
8071 struct rpc_clnt *clnt = server->client;
8072 u32 bitmask[2] = {
8073 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8074 };
8075 struct nfs4_fs_locations_arg args = {
8076 .clientid = server->nfs_client->cl_clientid,
8077 .fh = fhandle,
8078 .page = page,
8079 .bitmask = bitmask,
8080 .migration = 1, /* skip LOOKUP */
8081 .renew = 1, /* append RENEW */
8082 };
8083 struct nfs4_fs_locations_res res = {
8084 .fs_locations = locations,
8085 .migration = 1,
8086 .renew = 1,
8087 };
8088 struct rpc_message msg = {
8089 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8090 .rpc_argp = &args,
8091 .rpc_resp = &res,
8092 .rpc_cred = cred,
8093 };
8094 unsigned long now = jiffies;
8095 int status;
8096
8097 nfs_fattr_init(locations->fattr);
8098 locations->server = server;
8099 locations->nlocations = 0;
8100
8101 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8102 status = nfs4_call_sync_sequence(clnt, server, &msg,
8103 &args.seq_args, &res.seq_res);
8104 if (status)
8105 return status;
8106
8107 renew_lease(server, now);
8108 return 0;
8109 }
8110
8111 #ifdef CONFIG_NFS_V4_1
8112
8113 /*
8114 * This operation also signals the server that this client is
8115 * performing migration recovery. The server can stop asserting
8116 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID
8117 * performing this operation is identified in the SEQUENCE
8118 * operation in this compound.
8119 *
8120 * When the client supports GETATTR(fs_locations_info), it can
8121 * be plumbed in here.
8122 */
_nfs41_proc_get_locations(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)8123 static int _nfs41_proc_get_locations(struct nfs_server *server,
8124 struct nfs_fh *fhandle,
8125 struct nfs4_fs_locations *locations,
8126 struct page *page, const struct cred *cred)
8127 {
8128 struct rpc_clnt *clnt = server->client;
8129 u32 bitmask[2] = {
8130 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8131 };
8132 struct nfs4_fs_locations_arg args = {
8133 .fh = fhandle,
8134 .page = page,
8135 .bitmask = bitmask,
8136 .migration = 1, /* skip LOOKUP */
8137 };
8138 struct nfs4_fs_locations_res res = {
8139 .fs_locations = locations,
8140 .migration = 1,
8141 };
8142 struct rpc_message msg = {
8143 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8144 .rpc_argp = &args,
8145 .rpc_resp = &res,
8146 .rpc_cred = cred,
8147 };
8148 struct nfs4_call_sync_data data = {
8149 .seq_server = server,
8150 .seq_args = &args.seq_args,
8151 .seq_res = &res.seq_res,
8152 };
8153 struct rpc_task_setup task_setup_data = {
8154 .rpc_client = clnt,
8155 .rpc_message = &msg,
8156 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
8157 .callback_data = &data,
8158 .flags = RPC_TASK_NO_ROUND_ROBIN,
8159 };
8160 int status;
8161
8162 nfs_fattr_init(locations->fattr);
8163 locations->server = server;
8164 locations->nlocations = 0;
8165
8166 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8167 status = nfs4_call_sync_custom(&task_setup_data);
8168 if (status == NFS4_OK &&
8169 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8170 status = -NFS4ERR_LEASE_MOVED;
8171 return status;
8172 }
8173
8174 #endif /* CONFIG_NFS_V4_1 */
8175
8176 /**
8177 * nfs4_proc_get_locations - discover locations for a migrated FSID
8178 * @server: pointer to nfs_server to process
8179 * @fhandle: pointer to the kernel NFS client file handle
8180 * @locations: result of query
8181 * @page: buffer
8182 * @cred: credential to use for this operation
8183 *
8184 * Returns NFS4_OK on success, a negative NFS4ERR status code if the
8185 * operation failed, or a negative errno if a local error occurred.
8186 *
8187 * On success, "locations" is filled in, but if the server has
8188 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
8189 * asserted.
8190 *
8191 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
8192 * from this client that require migration recovery.
8193 */
nfs4_proc_get_locations(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)8194 int nfs4_proc_get_locations(struct nfs_server *server,
8195 struct nfs_fh *fhandle,
8196 struct nfs4_fs_locations *locations,
8197 struct page *page, const struct cred *cred)
8198 {
8199 struct nfs_client *clp = server->nfs_client;
8200 const struct nfs4_mig_recovery_ops *ops =
8201 clp->cl_mvops->mig_recovery_ops;
8202 struct nfs4_exception exception = {
8203 .interruptible = true,
8204 };
8205 int status;
8206
8207 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8208 (unsigned long long)server->fsid.major,
8209 (unsigned long long)server->fsid.minor,
8210 clp->cl_hostname);
8211 nfs_display_fhandle(fhandle, __func__);
8212
8213 do {
8214 status = ops->get_locations(server, fhandle, locations, page,
8215 cred);
8216 if (status != -NFS4ERR_DELAY)
8217 break;
8218 nfs4_handle_exception(server, status, &exception);
8219 } while (exception.retry);
8220 return status;
8221 }
8222
8223 /*
8224 * This operation also signals the server that this client is
8225 * performing "lease moved" recovery. The server can stop
8226 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation
8227 * is appended to this compound to identify the client ID which is
8228 * performing recovery.
8229 */
_nfs40_proc_fsid_present(struct inode * inode,const struct cred * cred)8230 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
8231 {
8232 struct nfs_server *server = NFS_SERVER(inode);
8233 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
8234 struct rpc_clnt *clnt = server->client;
8235 struct nfs4_fsid_present_arg args = {
8236 .fh = NFS_FH(inode),
8237 .clientid = clp->cl_clientid,
8238 .renew = 1, /* append RENEW */
8239 };
8240 struct nfs4_fsid_present_res res = {
8241 .renew = 1,
8242 };
8243 struct rpc_message msg = {
8244 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8245 .rpc_argp = &args,
8246 .rpc_resp = &res,
8247 .rpc_cred = cred,
8248 };
8249 unsigned long now = jiffies;
8250 int status;
8251
8252 res.fh = nfs_alloc_fhandle();
8253 if (res.fh == NULL)
8254 return -ENOMEM;
8255
8256 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8257 status = nfs4_call_sync_sequence(clnt, server, &msg,
8258 &args.seq_args, &res.seq_res);
8259 nfs_free_fhandle(res.fh);
8260 if (status)
8261 return status;
8262
8263 do_renew_lease(clp, now);
8264 return 0;
8265 }
8266
8267 #ifdef CONFIG_NFS_V4_1
8268
8269 /*
8270 * This operation also signals the server that this client is
8271 * performing "lease moved" recovery. The server can stop asserting
8272 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing
8273 * this operation is identified in the SEQUENCE operation in this
8274 * compound.
8275 */
_nfs41_proc_fsid_present(struct inode * inode,const struct cred * cred)8276 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
8277 {
8278 struct nfs_server *server = NFS_SERVER(inode);
8279 struct rpc_clnt *clnt = server->client;
8280 struct nfs4_fsid_present_arg args = {
8281 .fh = NFS_FH(inode),
8282 };
8283 struct nfs4_fsid_present_res res = {
8284 };
8285 struct rpc_message msg = {
8286 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8287 .rpc_argp = &args,
8288 .rpc_resp = &res,
8289 .rpc_cred = cred,
8290 };
8291 int status;
8292
8293 res.fh = nfs_alloc_fhandle();
8294 if (res.fh == NULL)
8295 return -ENOMEM;
8296
8297 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8298 status = nfs4_call_sync_sequence(clnt, server, &msg,
8299 &args.seq_args, &res.seq_res);
8300 nfs_free_fhandle(res.fh);
8301 if (status == NFS4_OK &&
8302 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8303 status = -NFS4ERR_LEASE_MOVED;
8304 return status;
8305 }
8306
8307 #endif /* CONFIG_NFS_V4_1 */
8308
8309 /**
8310 * nfs4_proc_fsid_present - Is this FSID present or absent on server?
8311 * @inode: inode on FSID to check
8312 * @cred: credential to use for this operation
8313 *
8314 * Server indicates whether the FSID is present, moved, or not
8315 * recognized. This operation is necessary to clear a LEASE_MOVED
8316 * condition for this client ID.
8317 *
8318 * Returns NFS4_OK if the FSID is present on this server,
8319 * -NFS4ERR_MOVED if the FSID is no longer present, a negative
8320 * NFS4ERR code if some error occurred on the server, or a
8321 * negative errno if a local failure occurred.
8322 */
nfs4_proc_fsid_present(struct inode * inode,const struct cred * cred)8323 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
8324 {
8325 struct nfs_server *server = NFS_SERVER(inode);
8326 struct nfs_client *clp = server->nfs_client;
8327 const struct nfs4_mig_recovery_ops *ops =
8328 clp->cl_mvops->mig_recovery_ops;
8329 struct nfs4_exception exception = {
8330 .interruptible = true,
8331 };
8332 int status;
8333
8334 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8335 (unsigned long long)server->fsid.major,
8336 (unsigned long long)server->fsid.minor,
8337 clp->cl_hostname);
8338 nfs_display_fhandle(NFS_FH(inode), __func__);
8339
8340 do {
8341 status = ops->fsid_present(inode, cred);
8342 if (status != -NFS4ERR_DELAY)
8343 break;
8344 nfs4_handle_exception(server, status, &exception);
8345 } while (exception.retry);
8346 return status;
8347 }
8348
8349 /*
8350 * If 'use_integrity' is true and the state managment nfs_client
8351 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
8352 * and the machine credential as per RFC3530bis and RFC5661 Security
8353 * Considerations sections. Otherwise, just use the user cred with the
8354 * filesystem's rpc_client.
8355 */
_nfs4_proc_secinfo(struct inode * dir,const struct qstr * name,struct nfs4_secinfo_flavors * flavors,bool use_integrity)8356 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8357 {
8358 int status;
8359 struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
8360 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
8361 struct nfs4_secinfo_arg args = {
8362 .dir_fh = NFS_FH(dir),
8363 .name = name,
8364 };
8365 struct nfs4_secinfo_res res = {
8366 .flavors = flavors,
8367 };
8368 struct rpc_message msg = {
8369 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
8370 .rpc_argp = &args,
8371 .rpc_resp = &res,
8372 };
8373 struct nfs4_call_sync_data data = {
8374 .seq_server = NFS_SERVER(dir),
8375 .seq_args = &args.seq_args,
8376 .seq_res = &res.seq_res,
8377 };
8378 struct rpc_task_setup task_setup = {
8379 .rpc_client = clnt,
8380 .rpc_message = &msg,
8381 .callback_ops = clp->cl_mvops->call_sync_ops,
8382 .callback_data = &data,
8383 .flags = RPC_TASK_NO_ROUND_ROBIN,
8384 };
8385 const struct cred *cred = NULL;
8386
8387 if (use_integrity) {
8388 clnt = clp->cl_rpcclient;
8389 task_setup.rpc_client = clnt;
8390
8391 cred = nfs4_get_clid_cred(clp);
8392 msg.rpc_cred = cred;
8393 }
8394
8395 dprintk("NFS call secinfo %s\n", name->name);
8396
8397 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
8398 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
8399 status = nfs4_call_sync_custom(&task_setup);
8400
8401 dprintk("NFS reply secinfo: %d\n", status);
8402
8403 put_cred(cred);
8404 return status;
8405 }
8406
nfs4_proc_secinfo(struct inode * dir,const struct qstr * name,struct nfs4_secinfo_flavors * flavors)8407 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8408 struct nfs4_secinfo_flavors *flavors)
8409 {
8410 struct nfs4_exception exception = {
8411 .interruptible = true,
8412 };
8413 int err;
8414 do {
8415 err = -NFS4ERR_WRONGSEC;
8416
8417 /* try to use integrity protection with machine cred */
8418 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8419 err = _nfs4_proc_secinfo(dir, name, flavors, true);
8420
8421 /*
8422 * if unable to use integrity protection, or SECINFO with
8423 * integrity protection returns NFS4ERR_WRONGSEC (which is
8424 * disallowed by spec, but exists in deployed servers) use
8425 * the current filesystem's rpc_client and the user cred.
8426 */
8427 if (err == -NFS4ERR_WRONGSEC)
8428 err = _nfs4_proc_secinfo(dir, name, flavors, false);
8429
8430 trace_nfs4_secinfo(dir, name, err);
8431 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8432 &exception);
8433 } while (exception.retry);
8434 return err;
8435 }
8436
8437 #ifdef CONFIG_NFS_V4_1
8438 /*
8439 * Check the exchange flags returned by the server for invalid flags, having
8440 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8441 * DS flags set.
8442 */
nfs4_check_cl_exchange_flags(u32 flags,u32 version)8443 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
8444 {
8445 if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
8446 goto out_inval;
8447 else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
8448 goto out_inval;
8449 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8450 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8451 goto out_inval;
8452 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8453 goto out_inval;
8454 return NFS_OK;
8455 out_inval:
8456 return -NFS4ERR_INVAL;
8457 }
8458
8459 static bool
nfs41_same_server_scope(struct nfs41_server_scope * a,struct nfs41_server_scope * b)8460 nfs41_same_server_scope(struct nfs41_server_scope *a,
8461 struct nfs41_server_scope *b)
8462 {
8463 if (a->server_scope_sz != b->server_scope_sz)
8464 return false;
8465 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8466 }
8467
8468 static void
nfs4_bind_one_conn_to_session_done(struct rpc_task * task,void * calldata)8469 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8470 {
8471 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8472 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8473 struct nfs_client *clp = args->client;
8474
8475 switch (task->tk_status) {
8476 case -NFS4ERR_BADSESSION:
8477 case -NFS4ERR_DEADSESSION:
8478 nfs4_schedule_session_recovery(clp->cl_session,
8479 task->tk_status);
8480 return;
8481 }
8482 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8483 res->dir != NFS4_CDFS4_BOTH) {
8484 rpc_task_close_connection(task);
8485 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8486 rpc_restart_call(task);
8487 }
8488 }
8489
8490 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8491 .rpc_call_done = nfs4_bind_one_conn_to_session_done,
8492 };
8493
8494 /*
8495 * nfs4_proc_bind_one_conn_to_session()
8496 *
8497 * The 4.1 client currently uses the same TCP connection for the
8498 * fore and backchannel.
8499 */
8500 static
nfs4_proc_bind_one_conn_to_session(struct rpc_clnt * clnt,struct rpc_xprt * xprt,struct nfs_client * clp,const struct cred * cred)8501 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8502 struct rpc_xprt *xprt,
8503 struct nfs_client *clp,
8504 const struct cred *cred)
8505 {
8506 int status;
8507 struct nfs41_bind_conn_to_session_args args = {
8508 .client = clp,
8509 .dir = NFS4_CDFC4_FORE_OR_BOTH,
8510 .retries = 0,
8511 };
8512 struct nfs41_bind_conn_to_session_res res;
8513 struct rpc_message msg = {
8514 .rpc_proc =
8515 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8516 .rpc_argp = &args,
8517 .rpc_resp = &res,
8518 .rpc_cred = cred,
8519 };
8520 struct rpc_task_setup task_setup_data = {
8521 .rpc_client = clnt,
8522 .rpc_xprt = xprt,
8523 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
8524 .rpc_message = &msg,
8525 .flags = RPC_TASK_TIMEOUT,
8526 };
8527 struct rpc_task *task;
8528
8529 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8530 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8531 args.dir = NFS4_CDFC4_FORE;
8532
8533 /* Do not set the backchannel flag unless this is clnt->cl_xprt */
8534 if (xprt != rcu_access_pointer(clnt->cl_xprt))
8535 args.dir = NFS4_CDFC4_FORE;
8536
8537 task = rpc_run_task(&task_setup_data);
8538 if (!IS_ERR(task)) {
8539 status = task->tk_status;
8540 rpc_put_task(task);
8541 } else
8542 status = PTR_ERR(task);
8543 trace_nfs4_bind_conn_to_session(clp, status);
8544 if (status == 0) {
8545 if (memcmp(res.sessionid.data,
8546 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8547 dprintk("NFS: %s: Session ID mismatch\n", __func__);
8548 return -EIO;
8549 }
8550 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8551 dprintk("NFS: %s: Unexpected direction from server\n",
8552 __func__);
8553 return -EIO;
8554 }
8555 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8556 dprintk("NFS: %s: Server returned RDMA mode = true\n",
8557 __func__);
8558 return -EIO;
8559 }
8560 }
8561
8562 return status;
8563 }
8564
8565 struct rpc_bind_conn_calldata {
8566 struct nfs_client *clp;
8567 const struct cred *cred;
8568 };
8569
8570 static int
nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt * clnt,struct rpc_xprt * xprt,void * calldata)8571 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8572 struct rpc_xprt *xprt,
8573 void *calldata)
8574 {
8575 struct rpc_bind_conn_calldata *p = calldata;
8576
8577 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8578 }
8579
nfs4_proc_bind_conn_to_session(struct nfs_client * clp,const struct cred * cred)8580 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8581 {
8582 struct rpc_bind_conn_calldata data = {
8583 .clp = clp,
8584 .cred = cred,
8585 };
8586 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8587 nfs4_proc_bind_conn_to_session_callback, &data);
8588 }
8589
8590 /*
8591 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8592 * and operations we'd like to see to enable certain features in the allow map
8593 */
8594 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8595 .how = SP4_MACH_CRED,
8596 .enforce.u.words = {
8597 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8598 1 << (OP_EXCHANGE_ID - 32) |
8599 1 << (OP_CREATE_SESSION - 32) |
8600 1 << (OP_DESTROY_SESSION - 32) |
8601 1 << (OP_DESTROY_CLIENTID - 32)
8602 },
8603 .allow.u.words = {
8604 [0] = 1 << (OP_CLOSE) |
8605 1 << (OP_OPEN_DOWNGRADE) |
8606 1 << (OP_LOCKU) |
8607 1 << (OP_DELEGRETURN) |
8608 1 << (OP_COMMIT),
8609 [1] = 1 << (OP_SECINFO - 32) |
8610 1 << (OP_SECINFO_NO_NAME - 32) |
8611 1 << (OP_LAYOUTRETURN - 32) |
8612 1 << (OP_TEST_STATEID - 32) |
8613 1 << (OP_FREE_STATEID - 32) |
8614 1 << (OP_WRITE - 32)
8615 }
8616 };
8617
8618 /*
8619 * Select the state protection mode for client `clp' given the server results
8620 * from exchange_id in `sp'.
8621 *
8622 * Returns 0 on success, negative errno otherwise.
8623 */
nfs4_sp4_select_mode(struct nfs_client * clp,struct nfs41_state_protection * sp)8624 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8625 struct nfs41_state_protection *sp)
8626 {
8627 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8628 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8629 1 << (OP_EXCHANGE_ID - 32) |
8630 1 << (OP_CREATE_SESSION - 32) |
8631 1 << (OP_DESTROY_SESSION - 32) |
8632 1 << (OP_DESTROY_CLIENTID - 32)
8633 };
8634 unsigned long flags = 0;
8635 unsigned int i;
8636 int ret = 0;
8637
8638 if (sp->how == SP4_MACH_CRED) {
8639 /* Print state protect result */
8640 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8641 for (i = 0; i <= LAST_NFS4_OP; i++) {
8642 if (test_bit(i, sp->enforce.u.longs))
8643 dfprintk(MOUNT, " enforce op %d\n", i);
8644 if (test_bit(i, sp->allow.u.longs))
8645 dfprintk(MOUNT, " allow op %d\n", i);
8646 }
8647
8648 /* make sure nothing is on enforce list that isn't supported */
8649 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8650 if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8651 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8652 ret = -EINVAL;
8653 goto out;
8654 }
8655 }
8656
8657 /*
8658 * Minimal mode - state operations are allowed to use machine
8659 * credential. Note this already happens by default, so the
8660 * client doesn't have to do anything more than the negotiation.
8661 *
8662 * NOTE: we don't care if EXCHANGE_ID is in the list -
8663 * we're already using the machine cred for exchange_id
8664 * and will never use a different cred.
8665 */
8666 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8667 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8668 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8669 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8670 dfprintk(MOUNT, "sp4_mach_cred:\n");
8671 dfprintk(MOUNT, " minimal mode enabled\n");
8672 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8673 } else {
8674 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8675 ret = -EINVAL;
8676 goto out;
8677 }
8678
8679 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8680 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8681 test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8682 test_bit(OP_LOCKU, sp->allow.u.longs)) {
8683 dfprintk(MOUNT, " cleanup mode enabled\n");
8684 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8685 }
8686
8687 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8688 dfprintk(MOUNT, " pnfs cleanup mode enabled\n");
8689 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8690 }
8691
8692 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8693 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8694 dfprintk(MOUNT, " secinfo mode enabled\n");
8695 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8696 }
8697
8698 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8699 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8700 dfprintk(MOUNT, " stateid mode enabled\n");
8701 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8702 }
8703
8704 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8705 dfprintk(MOUNT, " write mode enabled\n");
8706 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8707 }
8708
8709 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8710 dfprintk(MOUNT, " commit mode enabled\n");
8711 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8712 }
8713 }
8714 out:
8715 clp->cl_sp4_flags = flags;
8716 return ret;
8717 }
8718
8719 struct nfs41_exchange_id_data {
8720 struct nfs41_exchange_id_res res;
8721 struct nfs41_exchange_id_args args;
8722 };
8723
nfs4_exchange_id_release(void * data)8724 static void nfs4_exchange_id_release(void *data)
8725 {
8726 struct nfs41_exchange_id_data *cdata =
8727 (struct nfs41_exchange_id_data *)data;
8728
8729 nfs_put_client(cdata->args.client);
8730 kfree(cdata->res.impl_id);
8731 kfree(cdata->res.server_scope);
8732 kfree(cdata->res.server_owner);
8733 kfree(cdata);
8734 }
8735
8736 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8737 .rpc_release = nfs4_exchange_id_release,
8738 };
8739
8740 /*
8741 * _nfs4_proc_exchange_id()
8742 *
8743 * Wrapper for EXCHANGE_ID operation.
8744 */
8745 static struct rpc_task *
nfs4_run_exchange_id(struct nfs_client * clp,const struct cred * cred,u32 sp4_how,struct rpc_xprt * xprt)8746 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8747 u32 sp4_how, struct rpc_xprt *xprt)
8748 {
8749 struct rpc_message msg = {
8750 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8751 .rpc_cred = cred,
8752 };
8753 struct rpc_task_setup task_setup_data = {
8754 .rpc_client = clp->cl_rpcclient,
8755 .callback_ops = &nfs4_exchange_id_call_ops,
8756 .rpc_message = &msg,
8757 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8758 };
8759 struct nfs41_exchange_id_data *calldata;
8760 int status;
8761
8762 if (!refcount_inc_not_zero(&clp->cl_count))
8763 return ERR_PTR(-EIO);
8764
8765 status = -ENOMEM;
8766 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8767 if (!calldata)
8768 goto out;
8769
8770 nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8771
8772 status = nfs4_init_uniform_client_string(clp);
8773 if (status)
8774 goto out_calldata;
8775
8776 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8777 GFP_NOFS);
8778 status = -ENOMEM;
8779 if (unlikely(calldata->res.server_owner == NULL))
8780 goto out_calldata;
8781
8782 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8783 GFP_NOFS);
8784 if (unlikely(calldata->res.server_scope == NULL))
8785 goto out_server_owner;
8786
8787 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8788 if (unlikely(calldata->res.impl_id == NULL))
8789 goto out_server_scope;
8790
8791 switch (sp4_how) {
8792 case SP4_NONE:
8793 calldata->args.state_protect.how = SP4_NONE;
8794 break;
8795
8796 case SP4_MACH_CRED:
8797 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8798 break;
8799
8800 default:
8801 /* unsupported! */
8802 WARN_ON_ONCE(1);
8803 status = -EINVAL;
8804 goto out_impl_id;
8805 }
8806 if (xprt) {
8807 task_setup_data.rpc_xprt = xprt;
8808 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8809 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8810 sizeof(calldata->args.verifier.data));
8811 }
8812 calldata->args.client = clp;
8813 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8814 EXCHGID4_FLAG_BIND_PRINC_STATEID;
8815 #ifdef CONFIG_NFS_V4_1_MIGRATION
8816 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8817 #endif
8818 if (test_bit(NFS_CS_DS, &clp->cl_flags))
8819 calldata->args.flags |= EXCHGID4_FLAG_USE_PNFS_DS;
8820 msg.rpc_argp = &calldata->args;
8821 msg.rpc_resp = &calldata->res;
8822 task_setup_data.callback_data = calldata;
8823
8824 return rpc_run_task(&task_setup_data);
8825
8826 out_impl_id:
8827 kfree(calldata->res.impl_id);
8828 out_server_scope:
8829 kfree(calldata->res.server_scope);
8830 out_server_owner:
8831 kfree(calldata->res.server_owner);
8832 out_calldata:
8833 kfree(calldata);
8834 out:
8835 nfs_put_client(clp);
8836 return ERR_PTR(status);
8837 }
8838
8839 /*
8840 * _nfs4_proc_exchange_id()
8841 *
8842 * Wrapper for EXCHANGE_ID operation.
8843 */
_nfs4_proc_exchange_id(struct nfs_client * clp,const struct cred * cred,u32 sp4_how)8844 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8845 u32 sp4_how)
8846 {
8847 struct rpc_task *task;
8848 struct nfs41_exchange_id_args *argp;
8849 struct nfs41_exchange_id_res *resp;
8850 unsigned long now = jiffies;
8851 int status;
8852
8853 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8854 if (IS_ERR(task))
8855 return PTR_ERR(task);
8856
8857 argp = task->tk_msg.rpc_argp;
8858 resp = task->tk_msg.rpc_resp;
8859 status = task->tk_status;
8860 if (status != 0)
8861 goto out;
8862
8863 status = nfs4_check_cl_exchange_flags(resp->flags,
8864 clp->cl_mvops->minor_version);
8865 if (status != 0)
8866 goto out;
8867
8868 status = nfs4_sp4_select_mode(clp, &resp->state_protect);
8869 if (status != 0)
8870 goto out;
8871
8872 do_renew_lease(clp, now);
8873
8874 clp->cl_clientid = resp->clientid;
8875 clp->cl_exchange_flags = resp->flags;
8876 clp->cl_seqid = resp->seqid;
8877 /* Client ID is not confirmed */
8878 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
8879 clear_bit(NFS4_SESSION_ESTABLISHED,
8880 &clp->cl_session->session_state);
8881
8882 if (clp->cl_serverscope != NULL &&
8883 !nfs41_same_server_scope(clp->cl_serverscope,
8884 resp->server_scope)) {
8885 dprintk("%s: server_scope mismatch detected\n",
8886 __func__);
8887 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
8888 }
8889
8890 swap(clp->cl_serverowner, resp->server_owner);
8891 swap(clp->cl_serverscope, resp->server_scope);
8892 swap(clp->cl_implid, resp->impl_id);
8893
8894 /* Save the EXCHANGE_ID verifier session trunk tests */
8895 memcpy(clp->cl_confirm.data, argp->verifier.data,
8896 sizeof(clp->cl_confirm.data));
8897 out:
8898 trace_nfs4_exchange_id(clp, status);
8899 rpc_put_task(task);
8900 return status;
8901 }
8902
8903 /*
8904 * nfs4_proc_exchange_id()
8905 *
8906 * Returns zero, a negative errno, or a negative NFS4ERR status code.
8907 *
8908 * Since the clientid has expired, all compounds using sessions
8909 * associated with the stale clientid will be returning
8910 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
8911 * be in some phase of session reset.
8912 *
8913 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
8914 */
nfs4_proc_exchange_id(struct nfs_client * clp,const struct cred * cred)8915 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
8916 {
8917 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
8918 int status;
8919
8920 /* try SP4_MACH_CRED if krb5i/p */
8921 if (authflavor == RPC_AUTH_GSS_KRB5I ||
8922 authflavor == RPC_AUTH_GSS_KRB5P) {
8923 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
8924 if (!status)
8925 return 0;
8926 }
8927
8928 /* try SP4_NONE */
8929 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
8930 }
8931
8932 /**
8933 * nfs4_test_session_trunk
8934 *
8935 * This is an add_xprt_test() test function called from
8936 * rpc_clnt_setup_test_and_add_xprt.
8937 *
8938 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
8939 * and is dereferrenced in nfs4_exchange_id_release
8940 *
8941 * Upon success, add the new transport to the rpc_clnt
8942 *
8943 * @clnt: struct rpc_clnt to get new transport
8944 * @xprt: the rpc_xprt to test
8945 * @data: call data for _nfs4_proc_exchange_id.
8946 */
nfs4_test_session_trunk(struct rpc_clnt * clnt,struct rpc_xprt * xprt,void * data)8947 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
8948 void *data)
8949 {
8950 struct nfs4_add_xprt_data *adata = data;
8951 struct rpc_task *task;
8952 int status;
8953
8954 u32 sp4_how;
8955
8956 dprintk("--> %s try %s\n", __func__,
8957 xprt->address_strings[RPC_DISPLAY_ADDR]);
8958
8959 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
8960
8961 try_again:
8962 /* Test connection for session trunking. Async exchange_id call */
8963 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
8964 if (IS_ERR(task))
8965 return;
8966
8967 status = task->tk_status;
8968 if (status == 0)
8969 status = nfs4_detect_session_trunking(adata->clp,
8970 task->tk_msg.rpc_resp, xprt);
8971
8972 if (status == 0)
8973 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
8974 else if (status != -NFS4ERR_DELAY && rpc_clnt_xprt_switch_has_addr(clnt,
8975 (struct sockaddr *)&xprt->addr))
8976 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt);
8977
8978 rpc_put_task(task);
8979 if (status == -NFS4ERR_DELAY) {
8980 ssleep(1);
8981 goto try_again;
8982 }
8983 }
8984 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
8985
_nfs4_proc_destroy_clientid(struct nfs_client * clp,const struct cred * cred)8986 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
8987 const struct cred *cred)
8988 {
8989 struct rpc_message msg = {
8990 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
8991 .rpc_argp = clp,
8992 .rpc_cred = cred,
8993 };
8994 int status;
8995
8996 status = rpc_call_sync(clp->cl_rpcclient, &msg,
8997 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8998 trace_nfs4_destroy_clientid(clp, status);
8999 if (status)
9000 dprintk("NFS: Got error %d from the server %s on "
9001 "DESTROY_CLIENTID.", status, clp->cl_hostname);
9002 return status;
9003 }
9004
nfs4_proc_destroy_clientid(struct nfs_client * clp,const struct cred * cred)9005 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
9006 const struct cred *cred)
9007 {
9008 unsigned int loop;
9009 int ret;
9010
9011 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
9012 ret = _nfs4_proc_destroy_clientid(clp, cred);
9013 switch (ret) {
9014 case -NFS4ERR_DELAY:
9015 case -NFS4ERR_CLIENTID_BUSY:
9016 ssleep(1);
9017 break;
9018 default:
9019 return ret;
9020 }
9021 }
9022 return 0;
9023 }
9024
nfs4_destroy_clientid(struct nfs_client * clp)9025 int nfs4_destroy_clientid(struct nfs_client *clp)
9026 {
9027 const struct cred *cred;
9028 int ret = 0;
9029
9030 if (clp->cl_mvops->minor_version < 1)
9031 goto out;
9032 if (clp->cl_exchange_flags == 0)
9033 goto out;
9034 if (clp->cl_preserve_clid)
9035 goto out;
9036 cred = nfs4_get_clid_cred(clp);
9037 ret = nfs4_proc_destroy_clientid(clp, cred);
9038 put_cred(cred);
9039 switch (ret) {
9040 case 0:
9041 case -NFS4ERR_STALE_CLIENTID:
9042 clp->cl_exchange_flags = 0;
9043 }
9044 out:
9045 return ret;
9046 }
9047
9048 #endif /* CONFIG_NFS_V4_1 */
9049
9050 struct nfs4_get_lease_time_data {
9051 struct nfs4_get_lease_time_args *args;
9052 struct nfs4_get_lease_time_res *res;
9053 struct nfs_client *clp;
9054 };
9055
nfs4_get_lease_time_prepare(struct rpc_task * task,void * calldata)9056 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
9057 void *calldata)
9058 {
9059 struct nfs4_get_lease_time_data *data =
9060 (struct nfs4_get_lease_time_data *)calldata;
9061
9062 /* just setup sequence, do not trigger session recovery
9063 since we're invoked within one */
9064 nfs4_setup_sequence(data->clp,
9065 &data->args->la_seq_args,
9066 &data->res->lr_seq_res,
9067 task);
9068 }
9069
9070 /*
9071 * Called from nfs4_state_manager thread for session setup, so don't recover
9072 * from sequence operation or clientid errors.
9073 */
nfs4_get_lease_time_done(struct rpc_task * task,void * calldata)9074 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
9075 {
9076 struct nfs4_get_lease_time_data *data =
9077 (struct nfs4_get_lease_time_data *)calldata;
9078
9079 if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
9080 return;
9081 switch (task->tk_status) {
9082 case -NFS4ERR_DELAY:
9083 case -NFS4ERR_GRACE:
9084 rpc_delay(task, NFS4_POLL_RETRY_MIN);
9085 task->tk_status = 0;
9086 fallthrough;
9087 case -NFS4ERR_RETRY_UNCACHED_REP:
9088 rpc_restart_call_prepare(task);
9089 return;
9090 }
9091 }
9092
9093 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
9094 .rpc_call_prepare = nfs4_get_lease_time_prepare,
9095 .rpc_call_done = nfs4_get_lease_time_done,
9096 };
9097
nfs4_proc_get_lease_time(struct nfs_client * clp,struct nfs_fsinfo * fsinfo)9098 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
9099 {
9100 struct nfs4_get_lease_time_args args;
9101 struct nfs4_get_lease_time_res res = {
9102 .lr_fsinfo = fsinfo,
9103 };
9104 struct nfs4_get_lease_time_data data = {
9105 .args = &args,
9106 .res = &res,
9107 .clp = clp,
9108 };
9109 struct rpc_message msg = {
9110 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
9111 .rpc_argp = &args,
9112 .rpc_resp = &res,
9113 };
9114 struct rpc_task_setup task_setup = {
9115 .rpc_client = clp->cl_rpcclient,
9116 .rpc_message = &msg,
9117 .callback_ops = &nfs4_get_lease_time_ops,
9118 .callback_data = &data,
9119 .flags = RPC_TASK_TIMEOUT,
9120 };
9121
9122 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
9123 return nfs4_call_sync_custom(&task_setup);
9124 }
9125
9126 #ifdef CONFIG_NFS_V4_1
9127
9128 /*
9129 * Initialize the values to be used by the client in CREATE_SESSION
9130 * If nfs4_init_session set the fore channel request and response sizes,
9131 * use them.
9132 *
9133 * Set the back channel max_resp_sz_cached to zero to force the client to
9134 * always set csa_cachethis to FALSE because the current implementation
9135 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
9136 */
nfs4_init_channel_attrs(struct nfs41_create_session_args * args,struct rpc_clnt * clnt)9137 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
9138 struct rpc_clnt *clnt)
9139 {
9140 unsigned int max_rqst_sz, max_resp_sz;
9141 unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
9142 unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
9143
9144 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
9145 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
9146
9147 /* Fore channel attributes */
9148 args->fc_attrs.max_rqst_sz = max_rqst_sz;
9149 args->fc_attrs.max_resp_sz = max_resp_sz;
9150 args->fc_attrs.max_ops = NFS4_MAX_OPS;
9151 args->fc_attrs.max_reqs = max_session_slots;
9152
9153 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
9154 "max_ops=%u max_reqs=%u\n",
9155 __func__,
9156 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
9157 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
9158
9159 /* Back channel attributes */
9160 args->bc_attrs.max_rqst_sz = max_bc_payload;
9161 args->bc_attrs.max_resp_sz = max_bc_payload;
9162 args->bc_attrs.max_resp_sz_cached = 0;
9163 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
9164 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
9165 if (args->bc_attrs.max_reqs > max_bc_slots)
9166 args->bc_attrs.max_reqs = max_bc_slots;
9167
9168 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
9169 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
9170 __func__,
9171 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
9172 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
9173 args->bc_attrs.max_reqs);
9174 }
9175
nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)9176 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
9177 struct nfs41_create_session_res *res)
9178 {
9179 struct nfs4_channel_attrs *sent = &args->fc_attrs;
9180 struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
9181
9182 if (rcvd->max_resp_sz > sent->max_resp_sz)
9183 return -EINVAL;
9184 /*
9185 * Our requested max_ops is the minimum we need; we're not
9186 * prepared to break up compounds into smaller pieces than that.
9187 * So, no point even trying to continue if the server won't
9188 * cooperate:
9189 */
9190 if (rcvd->max_ops < sent->max_ops)
9191 return -EINVAL;
9192 if (rcvd->max_reqs == 0)
9193 return -EINVAL;
9194 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
9195 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
9196 return 0;
9197 }
9198
nfs4_verify_back_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)9199 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
9200 struct nfs41_create_session_res *res)
9201 {
9202 struct nfs4_channel_attrs *sent = &args->bc_attrs;
9203 struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
9204
9205 if (!(res->flags & SESSION4_BACK_CHAN))
9206 goto out;
9207 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
9208 return -EINVAL;
9209 if (rcvd->max_resp_sz < sent->max_resp_sz)
9210 return -EINVAL;
9211 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
9212 return -EINVAL;
9213 if (rcvd->max_ops > sent->max_ops)
9214 return -EINVAL;
9215 if (rcvd->max_reqs > sent->max_reqs)
9216 return -EINVAL;
9217 out:
9218 return 0;
9219 }
9220
nfs4_verify_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)9221 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
9222 struct nfs41_create_session_res *res)
9223 {
9224 int ret;
9225
9226 ret = nfs4_verify_fore_channel_attrs(args, res);
9227 if (ret)
9228 return ret;
9229 return nfs4_verify_back_channel_attrs(args, res);
9230 }
9231
nfs4_update_session(struct nfs4_session * session,struct nfs41_create_session_res * res)9232 static void nfs4_update_session(struct nfs4_session *session,
9233 struct nfs41_create_session_res *res)
9234 {
9235 nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
9236 /* Mark client id and session as being confirmed */
9237 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
9238 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
9239 session->flags = res->flags;
9240 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
9241 if (res->flags & SESSION4_BACK_CHAN)
9242 memcpy(&session->bc_attrs, &res->bc_attrs,
9243 sizeof(session->bc_attrs));
9244 }
9245
_nfs4_proc_create_session(struct nfs_client * clp,const struct cred * cred)9246 static int _nfs4_proc_create_session(struct nfs_client *clp,
9247 const struct cred *cred)
9248 {
9249 struct nfs4_session *session = clp->cl_session;
9250 struct nfs41_create_session_args args = {
9251 .client = clp,
9252 .clientid = clp->cl_clientid,
9253 .seqid = clp->cl_seqid,
9254 .cb_program = NFS4_CALLBACK,
9255 };
9256 struct nfs41_create_session_res res;
9257
9258 struct rpc_message msg = {
9259 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
9260 .rpc_argp = &args,
9261 .rpc_resp = &res,
9262 .rpc_cred = cred,
9263 };
9264 int status;
9265
9266 nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
9267 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
9268
9269 status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9270 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9271 trace_nfs4_create_session(clp, status);
9272
9273 switch (status) {
9274 case -NFS4ERR_STALE_CLIENTID:
9275 case -NFS4ERR_DELAY:
9276 case -ETIMEDOUT:
9277 case -EACCES:
9278 case -EAGAIN:
9279 goto out;
9280 }
9281
9282 clp->cl_seqid++;
9283 if (!status) {
9284 /* Verify the session's negotiated channel_attrs values */
9285 status = nfs4_verify_channel_attrs(&args, &res);
9286 /* Increment the clientid slot sequence id */
9287 if (status)
9288 goto out;
9289 nfs4_update_session(session, &res);
9290 }
9291 out:
9292 return status;
9293 }
9294
9295 /*
9296 * Issues a CREATE_SESSION operation to the server.
9297 * It is the responsibility of the caller to verify the session is
9298 * expired before calling this routine.
9299 */
nfs4_proc_create_session(struct nfs_client * clp,const struct cred * cred)9300 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
9301 {
9302 int status;
9303 unsigned *ptr;
9304 struct nfs4_session *session = clp->cl_session;
9305 struct nfs4_add_xprt_data xprtdata = {
9306 .clp = clp,
9307 };
9308 struct rpc_add_xprt_test rpcdata = {
9309 .add_xprt_test = clp->cl_mvops->session_trunk,
9310 .data = &xprtdata,
9311 };
9312
9313 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
9314
9315 status = _nfs4_proc_create_session(clp, cred);
9316 if (status)
9317 goto out;
9318
9319 /* Init or reset the session slot tables */
9320 status = nfs4_setup_session_slot_tables(session);
9321 dprintk("slot table setup returned %d\n", status);
9322 if (status)
9323 goto out;
9324
9325 ptr = (unsigned *)&session->sess_id.data[0];
9326 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
9327 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
9328 rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata);
9329 out:
9330 return status;
9331 }
9332
9333 /*
9334 * Issue the over-the-wire RPC DESTROY_SESSION.
9335 * The caller must serialize access to this routine.
9336 */
nfs4_proc_destroy_session(struct nfs4_session * session,const struct cred * cred)9337 int nfs4_proc_destroy_session(struct nfs4_session *session,
9338 const struct cred *cred)
9339 {
9340 struct rpc_message msg = {
9341 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
9342 .rpc_argp = session,
9343 .rpc_cred = cred,
9344 };
9345 int status = 0;
9346
9347 /* session is still being setup */
9348 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
9349 return 0;
9350
9351 status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9352 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9353 trace_nfs4_destroy_session(session->clp, status);
9354
9355 if (status)
9356 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
9357 "Session has been destroyed regardless...\n", status);
9358 rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient);
9359 return status;
9360 }
9361
9362 /*
9363 * Renew the cl_session lease.
9364 */
9365 struct nfs4_sequence_data {
9366 struct nfs_client *clp;
9367 struct nfs4_sequence_args args;
9368 struct nfs4_sequence_res res;
9369 };
9370
nfs41_sequence_release(void * data)9371 static void nfs41_sequence_release(void *data)
9372 {
9373 struct nfs4_sequence_data *calldata = data;
9374 struct nfs_client *clp = calldata->clp;
9375
9376 if (refcount_read(&clp->cl_count) > 1)
9377 nfs4_schedule_state_renewal(clp);
9378 nfs_put_client(clp);
9379 kfree(calldata);
9380 }
9381
nfs41_sequence_handle_errors(struct rpc_task * task,struct nfs_client * clp)9382 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9383 {
9384 switch(task->tk_status) {
9385 case -NFS4ERR_DELAY:
9386 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9387 return -EAGAIN;
9388 default:
9389 nfs4_schedule_lease_recovery(clp);
9390 }
9391 return 0;
9392 }
9393
nfs41_sequence_call_done(struct rpc_task * task,void * data)9394 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
9395 {
9396 struct nfs4_sequence_data *calldata = data;
9397 struct nfs_client *clp = calldata->clp;
9398
9399 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
9400 return;
9401
9402 trace_nfs4_sequence(clp, task->tk_status);
9403 if (task->tk_status < 0 && !task->tk_client->cl_shutdown) {
9404 dprintk("%s ERROR %d\n", __func__, task->tk_status);
9405 if (refcount_read(&clp->cl_count) == 1)
9406 return;
9407
9408 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
9409 rpc_restart_call_prepare(task);
9410 return;
9411 }
9412 }
9413 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
9414 }
9415
nfs41_sequence_prepare(struct rpc_task * task,void * data)9416 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
9417 {
9418 struct nfs4_sequence_data *calldata = data;
9419 struct nfs_client *clp = calldata->clp;
9420 struct nfs4_sequence_args *args;
9421 struct nfs4_sequence_res *res;
9422
9423 args = task->tk_msg.rpc_argp;
9424 res = task->tk_msg.rpc_resp;
9425
9426 nfs4_setup_sequence(clp, args, res, task);
9427 }
9428
9429 static const struct rpc_call_ops nfs41_sequence_ops = {
9430 .rpc_call_done = nfs41_sequence_call_done,
9431 .rpc_call_prepare = nfs41_sequence_prepare,
9432 .rpc_release = nfs41_sequence_release,
9433 };
9434
_nfs41_proc_sequence(struct nfs_client * clp,const struct cred * cred,struct nfs4_slot * slot,bool is_privileged)9435 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9436 const struct cred *cred,
9437 struct nfs4_slot *slot,
9438 bool is_privileged)
9439 {
9440 struct nfs4_sequence_data *calldata;
9441 struct rpc_message msg = {
9442 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9443 .rpc_cred = cred,
9444 };
9445 struct rpc_task_setup task_setup_data = {
9446 .rpc_client = clp->cl_rpcclient,
9447 .rpc_message = &msg,
9448 .callback_ops = &nfs41_sequence_ops,
9449 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE,
9450 };
9451 struct rpc_task *ret;
9452
9453 ret = ERR_PTR(-EIO);
9454 if (!refcount_inc_not_zero(&clp->cl_count))
9455 goto out_err;
9456
9457 ret = ERR_PTR(-ENOMEM);
9458 calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
9459 if (calldata == NULL)
9460 goto out_put_clp;
9461 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
9462 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9463 msg.rpc_argp = &calldata->args;
9464 msg.rpc_resp = &calldata->res;
9465 calldata->clp = clp;
9466 task_setup_data.callback_data = calldata;
9467
9468 ret = rpc_run_task(&task_setup_data);
9469 if (IS_ERR(ret))
9470 goto out_err;
9471 return ret;
9472 out_put_clp:
9473 nfs_put_client(clp);
9474 out_err:
9475 nfs41_release_slot(slot);
9476 return ret;
9477 }
9478
nfs41_proc_async_sequence(struct nfs_client * clp,const struct cred * cred,unsigned renew_flags)9479 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9480 {
9481 struct rpc_task *task;
9482 int ret = 0;
9483
9484 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9485 return -EAGAIN;
9486 task = _nfs41_proc_sequence(clp, cred, NULL, false);
9487 if (IS_ERR(task))
9488 ret = PTR_ERR(task);
9489 else
9490 rpc_put_task_async(task);
9491 dprintk("<-- %s status=%d\n", __func__, ret);
9492 return ret;
9493 }
9494
nfs4_proc_sequence(struct nfs_client * clp,const struct cred * cred)9495 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9496 {
9497 struct rpc_task *task;
9498 int ret;
9499
9500 task = _nfs41_proc_sequence(clp, cred, NULL, true);
9501 if (IS_ERR(task)) {
9502 ret = PTR_ERR(task);
9503 goto out;
9504 }
9505 ret = rpc_wait_for_completion_task(task);
9506 if (!ret)
9507 ret = task->tk_status;
9508 rpc_put_task(task);
9509 out:
9510 dprintk("<-- %s status=%d\n", __func__, ret);
9511 return ret;
9512 }
9513
9514 struct nfs4_reclaim_complete_data {
9515 struct nfs_client *clp;
9516 struct nfs41_reclaim_complete_args arg;
9517 struct nfs41_reclaim_complete_res res;
9518 };
9519
nfs4_reclaim_complete_prepare(struct rpc_task * task,void * data)9520 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9521 {
9522 struct nfs4_reclaim_complete_data *calldata = data;
9523
9524 nfs4_setup_sequence(calldata->clp,
9525 &calldata->arg.seq_args,
9526 &calldata->res.seq_res,
9527 task);
9528 }
9529
nfs41_reclaim_complete_handle_errors(struct rpc_task * task,struct nfs_client * clp)9530 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9531 {
9532 switch(task->tk_status) {
9533 case 0:
9534 wake_up_all(&clp->cl_lock_waitq);
9535 fallthrough;
9536 case -NFS4ERR_COMPLETE_ALREADY:
9537 case -NFS4ERR_WRONG_CRED: /* What to do here? */
9538 break;
9539 case -NFS4ERR_DELAY:
9540 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9541 fallthrough;
9542 case -NFS4ERR_RETRY_UNCACHED_REP:
9543 case -EACCES:
9544 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n",
9545 __func__, task->tk_status, clp->cl_hostname);
9546 return -EAGAIN;
9547 case -NFS4ERR_BADSESSION:
9548 case -NFS4ERR_DEADSESSION:
9549 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9550 break;
9551 default:
9552 nfs4_schedule_lease_recovery(clp);
9553 }
9554 return 0;
9555 }
9556
nfs4_reclaim_complete_done(struct rpc_task * task,void * data)9557 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9558 {
9559 struct nfs4_reclaim_complete_data *calldata = data;
9560 struct nfs_client *clp = calldata->clp;
9561 struct nfs4_sequence_res *res = &calldata->res.seq_res;
9562
9563 if (!nfs41_sequence_done(task, res))
9564 return;
9565
9566 trace_nfs4_reclaim_complete(clp, task->tk_status);
9567 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9568 rpc_restart_call_prepare(task);
9569 return;
9570 }
9571 }
9572
nfs4_free_reclaim_complete_data(void * data)9573 static void nfs4_free_reclaim_complete_data(void *data)
9574 {
9575 struct nfs4_reclaim_complete_data *calldata = data;
9576
9577 kfree(calldata);
9578 }
9579
9580 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9581 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
9582 .rpc_call_done = nfs4_reclaim_complete_done,
9583 .rpc_release = nfs4_free_reclaim_complete_data,
9584 };
9585
9586 /*
9587 * Issue a global reclaim complete.
9588 */
nfs41_proc_reclaim_complete(struct nfs_client * clp,const struct cred * cred)9589 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9590 const struct cred *cred)
9591 {
9592 struct nfs4_reclaim_complete_data *calldata;
9593 struct rpc_message msg = {
9594 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9595 .rpc_cred = cred,
9596 };
9597 struct rpc_task_setup task_setup_data = {
9598 .rpc_client = clp->cl_rpcclient,
9599 .rpc_message = &msg,
9600 .callback_ops = &nfs4_reclaim_complete_call_ops,
9601 .flags = RPC_TASK_NO_ROUND_ROBIN,
9602 };
9603 int status = -ENOMEM;
9604
9605 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9606 if (calldata == NULL)
9607 goto out;
9608 calldata->clp = clp;
9609 calldata->arg.one_fs = 0;
9610
9611 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9612 msg.rpc_argp = &calldata->arg;
9613 msg.rpc_resp = &calldata->res;
9614 task_setup_data.callback_data = calldata;
9615 status = nfs4_call_sync_custom(&task_setup_data);
9616 out:
9617 dprintk("<-- %s status=%d\n", __func__, status);
9618 return status;
9619 }
9620
9621 static void
nfs4_layoutget_prepare(struct rpc_task * task,void * calldata)9622 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9623 {
9624 struct nfs4_layoutget *lgp = calldata;
9625 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9626
9627 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9628 &lgp->res.seq_res, task);
9629 }
9630
nfs4_layoutget_done(struct rpc_task * task,void * calldata)9631 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9632 {
9633 struct nfs4_layoutget *lgp = calldata;
9634
9635 nfs41_sequence_process(task, &lgp->res.seq_res);
9636 }
9637
9638 static int
nfs4_layoutget_handle_exception(struct rpc_task * task,struct nfs4_layoutget * lgp,struct nfs4_exception * exception)9639 nfs4_layoutget_handle_exception(struct rpc_task *task,
9640 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9641 {
9642 struct inode *inode = lgp->args.inode;
9643 struct nfs_server *server = NFS_SERVER(inode);
9644 struct pnfs_layout_hdr *lo = lgp->lo;
9645 int nfs4err = task->tk_status;
9646 int err, status = 0;
9647 LIST_HEAD(head);
9648
9649 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9650
9651 nfs4_sequence_free_slot(&lgp->res.seq_res);
9652
9653 switch (nfs4err) {
9654 case 0:
9655 goto out;
9656
9657 /*
9658 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9659 * on the file. set tk_status to -ENODATA to tell upper layer to
9660 * retry go inband.
9661 */
9662 case -NFS4ERR_LAYOUTUNAVAILABLE:
9663 status = -ENODATA;
9664 goto out;
9665 /*
9666 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9667 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9668 */
9669 case -NFS4ERR_BADLAYOUT:
9670 status = -EOVERFLOW;
9671 goto out;
9672 /*
9673 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9674 * (or clients) writing to the same RAID stripe except when
9675 * the minlength argument is 0 (see RFC5661 section 18.43.3).
9676 *
9677 * Treat it like we would RECALLCONFLICT -- we retry for a little
9678 * while, and then eventually give up.
9679 */
9680 case -NFS4ERR_LAYOUTTRYLATER:
9681 if (lgp->args.minlength == 0) {
9682 status = -EOVERFLOW;
9683 goto out;
9684 }
9685 status = -EBUSY;
9686 break;
9687 case -NFS4ERR_RECALLCONFLICT:
9688 case -NFS4ERR_RETURNCONFLICT:
9689 status = -ERECALLCONFLICT;
9690 break;
9691 case -NFS4ERR_DELEG_REVOKED:
9692 case -NFS4ERR_ADMIN_REVOKED:
9693 case -NFS4ERR_EXPIRED:
9694 case -NFS4ERR_BAD_STATEID:
9695 exception->timeout = 0;
9696 spin_lock(&inode->i_lock);
9697 /* If the open stateid was bad, then recover it. */
9698 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9699 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9700 spin_unlock(&inode->i_lock);
9701 exception->state = lgp->args.ctx->state;
9702 exception->stateid = &lgp->args.stateid;
9703 break;
9704 }
9705
9706 /*
9707 * Mark the bad layout state as invalid, then retry
9708 */
9709 pnfs_mark_layout_stateid_invalid(lo, &head);
9710 spin_unlock(&inode->i_lock);
9711 nfs_commit_inode(inode, 0);
9712 pnfs_free_lseg_list(&head);
9713 status = -EAGAIN;
9714 goto out;
9715 }
9716
9717 err = nfs4_handle_exception(server, nfs4err, exception);
9718 if (!status) {
9719 if (exception->retry)
9720 status = -EAGAIN;
9721 else
9722 status = err;
9723 }
9724 out:
9725 return status;
9726 }
9727
max_response_pages(struct nfs_server * server)9728 size_t max_response_pages(struct nfs_server *server)
9729 {
9730 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9731 return nfs_page_array_len(0, max_resp_sz);
9732 }
9733
nfs4_layoutget_release(void * calldata)9734 static void nfs4_layoutget_release(void *calldata)
9735 {
9736 struct nfs4_layoutget *lgp = calldata;
9737
9738 nfs4_sequence_free_slot(&lgp->res.seq_res);
9739 pnfs_layoutget_free(lgp);
9740 }
9741
9742 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9743 .rpc_call_prepare = nfs4_layoutget_prepare,
9744 .rpc_call_done = nfs4_layoutget_done,
9745 .rpc_release = nfs4_layoutget_release,
9746 };
9747
9748 struct pnfs_layout_segment *
nfs4_proc_layoutget(struct nfs4_layoutget * lgp,long * timeout)9749 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
9750 {
9751 struct inode *inode = lgp->args.inode;
9752 struct nfs_server *server = NFS_SERVER(inode);
9753 struct rpc_task *task;
9754 struct rpc_message msg = {
9755 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9756 .rpc_argp = &lgp->args,
9757 .rpc_resp = &lgp->res,
9758 .rpc_cred = lgp->cred,
9759 };
9760 struct rpc_task_setup task_setup_data = {
9761 .rpc_client = server->client,
9762 .rpc_message = &msg,
9763 .callback_ops = &nfs4_layoutget_call_ops,
9764 .callback_data = lgp,
9765 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF |
9766 RPC_TASK_MOVEABLE,
9767 };
9768 struct pnfs_layout_segment *lseg = NULL;
9769 struct nfs4_exception exception = {
9770 .inode = inode,
9771 .timeout = *timeout,
9772 };
9773 int status = 0;
9774
9775 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9776
9777 task = rpc_run_task(&task_setup_data);
9778 if (IS_ERR(task))
9779 return ERR_CAST(task);
9780
9781 status = rpc_wait_for_completion_task(task);
9782 if (status != 0)
9783 goto out;
9784
9785 if (task->tk_status < 0) {
9786 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
9787 *timeout = exception.timeout;
9788 } else if (lgp->res.layoutp->len == 0) {
9789 status = -EAGAIN;
9790 *timeout = nfs4_update_delay(&exception.timeout);
9791 } else
9792 lseg = pnfs_layout_process(lgp);
9793 out:
9794 trace_nfs4_layoutget(lgp->args.ctx,
9795 &lgp->args.range,
9796 &lgp->res.range,
9797 &lgp->res.stateid,
9798 status);
9799
9800 rpc_put_task(task);
9801 dprintk("<-- %s status=%d\n", __func__, status);
9802 if (status)
9803 return ERR_PTR(status);
9804 return lseg;
9805 }
9806
9807 static void
nfs4_layoutreturn_prepare(struct rpc_task * task,void * calldata)9808 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9809 {
9810 struct nfs4_layoutreturn *lrp = calldata;
9811
9812 nfs4_setup_sequence(lrp->clp,
9813 &lrp->args.seq_args,
9814 &lrp->res.seq_res,
9815 task);
9816 if (!pnfs_layout_is_valid(lrp->args.layout))
9817 rpc_exit(task, 0);
9818 }
9819
nfs4_layoutreturn_done(struct rpc_task * task,void * calldata)9820 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9821 {
9822 struct nfs4_layoutreturn *lrp = calldata;
9823 struct nfs_server *server;
9824
9825 if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9826 return;
9827
9828 /*
9829 * Was there an RPC level error? Assume the call succeeded,
9830 * and that we need to release the layout
9831 */
9832 if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
9833 lrp->res.lrs_present = 0;
9834 return;
9835 }
9836
9837 server = NFS_SERVER(lrp->args.inode);
9838 switch (task->tk_status) {
9839 case -NFS4ERR_OLD_STATEID:
9840 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
9841 &lrp->args.range,
9842 lrp->args.inode))
9843 goto out_restart;
9844 fallthrough;
9845 default:
9846 task->tk_status = 0;
9847 fallthrough;
9848 case 0:
9849 break;
9850 case -NFS4ERR_DELAY:
9851 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
9852 break;
9853 goto out_restart;
9854 }
9855 return;
9856 out_restart:
9857 task->tk_status = 0;
9858 nfs4_sequence_free_slot(&lrp->res.seq_res);
9859 rpc_restart_call_prepare(task);
9860 }
9861
nfs4_layoutreturn_release(void * calldata)9862 static void nfs4_layoutreturn_release(void *calldata)
9863 {
9864 struct nfs4_layoutreturn *lrp = calldata;
9865 struct pnfs_layout_hdr *lo = lrp->args.layout;
9866
9867 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
9868 lrp->res.lrs_present ? &lrp->res.stateid : NULL);
9869 nfs4_sequence_free_slot(&lrp->res.seq_res);
9870 if (lrp->ld_private.ops && lrp->ld_private.ops->free)
9871 lrp->ld_private.ops->free(&lrp->ld_private);
9872 pnfs_put_layout_hdr(lrp->args.layout);
9873 nfs_iput_and_deactive(lrp->inode);
9874 put_cred(lrp->cred);
9875 kfree(calldata);
9876 }
9877
9878 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
9879 .rpc_call_prepare = nfs4_layoutreturn_prepare,
9880 .rpc_call_done = nfs4_layoutreturn_done,
9881 .rpc_release = nfs4_layoutreturn_release,
9882 };
9883
nfs4_proc_layoutreturn(struct nfs4_layoutreturn * lrp,bool sync)9884 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
9885 {
9886 struct rpc_task *task;
9887 struct rpc_message msg = {
9888 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
9889 .rpc_argp = &lrp->args,
9890 .rpc_resp = &lrp->res,
9891 .rpc_cred = lrp->cred,
9892 };
9893 struct rpc_task_setup task_setup_data = {
9894 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
9895 .rpc_message = &msg,
9896 .callback_ops = &nfs4_layoutreturn_call_ops,
9897 .callback_data = lrp,
9898 .flags = RPC_TASK_MOVEABLE,
9899 };
9900 int status = 0;
9901
9902 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
9903 NFS_SP4_MACH_CRED_PNFS_CLEANUP,
9904 &task_setup_data.rpc_client, &msg);
9905
9906 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
9907 if (!sync) {
9908 if (!lrp->inode) {
9909 nfs4_layoutreturn_release(lrp);
9910 return -EAGAIN;
9911 }
9912 task_setup_data.flags |= RPC_TASK_ASYNC;
9913 }
9914 if (!lrp->inode)
9915 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9916 1);
9917 else
9918 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9919 0);
9920 task = rpc_run_task(&task_setup_data);
9921 if (IS_ERR(task))
9922 return PTR_ERR(task);
9923 if (sync)
9924 status = task->tk_status;
9925 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
9926 dprintk("<-- %s status=%d\n", __func__, status);
9927 rpc_put_task(task);
9928 return status;
9929 }
9930
9931 static int
_nfs4_proc_getdeviceinfo(struct nfs_server * server,struct pnfs_device * pdev,const struct cred * cred)9932 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
9933 struct pnfs_device *pdev,
9934 const struct cred *cred)
9935 {
9936 struct nfs4_getdeviceinfo_args args = {
9937 .pdev = pdev,
9938 .notify_types = NOTIFY_DEVICEID4_CHANGE |
9939 NOTIFY_DEVICEID4_DELETE,
9940 };
9941 struct nfs4_getdeviceinfo_res res = {
9942 .pdev = pdev,
9943 };
9944 struct rpc_message msg = {
9945 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
9946 .rpc_argp = &args,
9947 .rpc_resp = &res,
9948 .rpc_cred = cred,
9949 };
9950 int status;
9951
9952 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
9953 if (res.notification & ~args.notify_types)
9954 dprintk("%s: unsupported notification\n", __func__);
9955 if (res.notification != args.notify_types)
9956 pdev->nocache = 1;
9957
9958 trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status);
9959
9960 dprintk("<-- %s status=%d\n", __func__, status);
9961
9962 return status;
9963 }
9964
nfs4_proc_getdeviceinfo(struct nfs_server * server,struct pnfs_device * pdev,const struct cred * cred)9965 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
9966 struct pnfs_device *pdev,
9967 const struct cred *cred)
9968 {
9969 struct nfs4_exception exception = { };
9970 int err;
9971
9972 do {
9973 err = nfs4_handle_exception(server,
9974 _nfs4_proc_getdeviceinfo(server, pdev, cred),
9975 &exception);
9976 } while (exception.retry);
9977 return err;
9978 }
9979 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
9980
nfs4_layoutcommit_prepare(struct rpc_task * task,void * calldata)9981 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
9982 {
9983 struct nfs4_layoutcommit_data *data = calldata;
9984 struct nfs_server *server = NFS_SERVER(data->args.inode);
9985
9986 nfs4_setup_sequence(server->nfs_client,
9987 &data->args.seq_args,
9988 &data->res.seq_res,
9989 task);
9990 }
9991
9992 static void
nfs4_layoutcommit_done(struct rpc_task * task,void * calldata)9993 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
9994 {
9995 struct nfs4_layoutcommit_data *data = calldata;
9996 struct nfs_server *server = NFS_SERVER(data->args.inode);
9997
9998 if (!nfs41_sequence_done(task, &data->res.seq_res))
9999 return;
10000
10001 switch (task->tk_status) { /* Just ignore these failures */
10002 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
10003 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
10004 case -NFS4ERR_BADLAYOUT: /* no layout */
10005 case -NFS4ERR_GRACE: /* loca_recalim always false */
10006 task->tk_status = 0;
10007 break;
10008 case 0:
10009 break;
10010 default:
10011 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
10012 rpc_restart_call_prepare(task);
10013 return;
10014 }
10015 }
10016 }
10017
nfs4_layoutcommit_release(void * calldata)10018 static void nfs4_layoutcommit_release(void *calldata)
10019 {
10020 struct nfs4_layoutcommit_data *data = calldata;
10021
10022 pnfs_cleanup_layoutcommit(data);
10023 nfs_post_op_update_inode_force_wcc(data->args.inode,
10024 data->res.fattr);
10025 put_cred(data->cred);
10026 nfs_iput_and_deactive(data->inode);
10027 kfree(data);
10028 }
10029
10030 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
10031 .rpc_call_prepare = nfs4_layoutcommit_prepare,
10032 .rpc_call_done = nfs4_layoutcommit_done,
10033 .rpc_release = nfs4_layoutcommit_release,
10034 };
10035
10036 int
nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data * data,bool sync)10037 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
10038 {
10039 struct rpc_message msg = {
10040 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
10041 .rpc_argp = &data->args,
10042 .rpc_resp = &data->res,
10043 .rpc_cred = data->cred,
10044 };
10045 struct rpc_task_setup task_setup_data = {
10046 .task = &data->task,
10047 .rpc_client = NFS_CLIENT(data->args.inode),
10048 .rpc_message = &msg,
10049 .callback_ops = &nfs4_layoutcommit_ops,
10050 .callback_data = data,
10051 .flags = RPC_TASK_MOVEABLE,
10052 };
10053 struct rpc_task *task;
10054 int status = 0;
10055
10056 dprintk("NFS: initiating layoutcommit call. sync %d "
10057 "lbw: %llu inode %lu\n", sync,
10058 data->args.lastbytewritten,
10059 data->args.inode->i_ino);
10060
10061 if (!sync) {
10062 data->inode = nfs_igrab_and_active(data->args.inode);
10063 if (data->inode == NULL) {
10064 nfs4_layoutcommit_release(data);
10065 return -EAGAIN;
10066 }
10067 task_setup_data.flags = RPC_TASK_ASYNC;
10068 }
10069 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
10070 task = rpc_run_task(&task_setup_data);
10071 if (IS_ERR(task))
10072 return PTR_ERR(task);
10073 if (sync)
10074 status = task->tk_status;
10075 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
10076 dprintk("%s: status %d\n", __func__, status);
10077 rpc_put_task(task);
10078 return status;
10079 }
10080
10081 /*
10082 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
10083 * possible) as per RFC3530bis and RFC5661 Security Considerations sections
10084 */
10085 static int
_nfs41_proc_secinfo_no_name(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info,struct nfs4_secinfo_flavors * flavors,bool use_integrity)10086 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10087 struct nfs_fsinfo *info,
10088 struct nfs4_secinfo_flavors *flavors, bool use_integrity)
10089 {
10090 struct nfs41_secinfo_no_name_args args = {
10091 .style = SECINFO_STYLE_CURRENT_FH,
10092 };
10093 struct nfs4_secinfo_res res = {
10094 .flavors = flavors,
10095 };
10096 struct rpc_message msg = {
10097 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
10098 .rpc_argp = &args,
10099 .rpc_resp = &res,
10100 };
10101 struct nfs4_call_sync_data data = {
10102 .seq_server = server,
10103 .seq_args = &args.seq_args,
10104 .seq_res = &res.seq_res,
10105 };
10106 struct rpc_task_setup task_setup = {
10107 .rpc_client = server->client,
10108 .rpc_message = &msg,
10109 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
10110 .callback_data = &data,
10111 .flags = RPC_TASK_NO_ROUND_ROBIN,
10112 };
10113 const struct cred *cred = NULL;
10114 int status;
10115
10116 if (use_integrity) {
10117 task_setup.rpc_client = server->nfs_client->cl_rpcclient;
10118
10119 cred = nfs4_get_clid_cred(server->nfs_client);
10120 msg.rpc_cred = cred;
10121 }
10122
10123 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
10124 status = nfs4_call_sync_custom(&task_setup);
10125 dprintk("<-- %s status=%d\n", __func__, status);
10126
10127 put_cred(cred);
10128
10129 return status;
10130 }
10131
10132 static int
nfs41_proc_secinfo_no_name(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info,struct nfs4_secinfo_flavors * flavors)10133 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10134 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
10135 {
10136 struct nfs4_exception exception = {
10137 .interruptible = true,
10138 };
10139 int err;
10140 do {
10141 /* first try using integrity protection */
10142 err = -NFS4ERR_WRONGSEC;
10143
10144 /* try to use integrity protection with machine cred */
10145 if (_nfs4_is_integrity_protected(server->nfs_client))
10146 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10147 flavors, true);
10148
10149 /*
10150 * if unable to use integrity protection, or SECINFO with
10151 * integrity protection returns NFS4ERR_WRONGSEC (which is
10152 * disallowed by spec, but exists in deployed servers) use
10153 * the current filesystem's rpc_client and the user cred.
10154 */
10155 if (err == -NFS4ERR_WRONGSEC)
10156 err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10157 flavors, false);
10158
10159 switch (err) {
10160 case 0:
10161 case -NFS4ERR_WRONGSEC:
10162 case -ENOTSUPP:
10163 goto out;
10164 default:
10165 err = nfs4_handle_exception(server, err, &exception);
10166 }
10167 } while (exception.retry);
10168 out:
10169 return err;
10170 }
10171
10172 static int
nfs41_find_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)10173 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
10174 struct nfs_fsinfo *info)
10175 {
10176 int err;
10177 struct page *page;
10178 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
10179 struct nfs4_secinfo_flavors *flavors;
10180 struct nfs4_secinfo4 *secinfo;
10181 int i;
10182
10183 page = alloc_page(GFP_KERNEL);
10184 if (!page) {
10185 err = -ENOMEM;
10186 goto out;
10187 }
10188
10189 flavors = page_address(page);
10190 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
10191
10192 /*
10193 * Fall back on "guess and check" method if
10194 * the server doesn't support SECINFO_NO_NAME
10195 */
10196 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
10197 err = nfs4_find_root_sec(server, fhandle, info);
10198 goto out_freepage;
10199 }
10200 if (err)
10201 goto out_freepage;
10202
10203 for (i = 0; i < flavors->num_flavors; i++) {
10204 secinfo = &flavors->flavors[i];
10205
10206 switch (secinfo->flavor) {
10207 case RPC_AUTH_NULL:
10208 case RPC_AUTH_UNIX:
10209 case RPC_AUTH_GSS:
10210 flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
10211 &secinfo->flavor_info);
10212 break;
10213 default:
10214 flavor = RPC_AUTH_MAXFLAVOR;
10215 break;
10216 }
10217
10218 if (!nfs_auth_info_match(&server->auth_info, flavor))
10219 flavor = RPC_AUTH_MAXFLAVOR;
10220
10221 if (flavor != RPC_AUTH_MAXFLAVOR) {
10222 err = nfs4_lookup_root_sec(server, fhandle,
10223 info, flavor);
10224 if (!err)
10225 break;
10226 }
10227 }
10228
10229 if (flavor == RPC_AUTH_MAXFLAVOR)
10230 err = -EPERM;
10231
10232 out_freepage:
10233 put_page(page);
10234 if (err == -EACCES)
10235 return -EPERM;
10236 out:
10237 return err;
10238 }
10239
_nfs41_test_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)10240 static int _nfs41_test_stateid(struct nfs_server *server,
10241 nfs4_stateid *stateid,
10242 const struct cred *cred)
10243 {
10244 int status;
10245 struct nfs41_test_stateid_args args = {
10246 .stateid = stateid,
10247 };
10248 struct nfs41_test_stateid_res res;
10249 struct rpc_message msg = {
10250 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
10251 .rpc_argp = &args,
10252 .rpc_resp = &res,
10253 .rpc_cred = cred,
10254 };
10255 struct rpc_clnt *rpc_client = server->client;
10256
10257 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10258 &rpc_client, &msg);
10259
10260 dprintk("NFS call test_stateid %p\n", stateid);
10261 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
10262 status = nfs4_call_sync_sequence(rpc_client, server, &msg,
10263 &args.seq_args, &res.seq_res);
10264 if (status != NFS_OK) {
10265 dprintk("NFS reply test_stateid: failed, %d\n", status);
10266 return status;
10267 }
10268 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
10269 return -res.status;
10270 }
10271
nfs4_handle_delay_or_session_error(struct nfs_server * server,int err,struct nfs4_exception * exception)10272 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
10273 int err, struct nfs4_exception *exception)
10274 {
10275 exception->retry = 0;
10276 switch(err) {
10277 case -NFS4ERR_DELAY:
10278 case -NFS4ERR_RETRY_UNCACHED_REP:
10279 nfs4_handle_exception(server, err, exception);
10280 break;
10281 case -NFS4ERR_BADSESSION:
10282 case -NFS4ERR_BADSLOT:
10283 case -NFS4ERR_BAD_HIGH_SLOT:
10284 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10285 case -NFS4ERR_DEADSESSION:
10286 nfs4_do_handle_exception(server, err, exception);
10287 }
10288 }
10289
10290 /**
10291 * nfs41_test_stateid - perform a TEST_STATEID operation
10292 *
10293 * @server: server / transport on which to perform the operation
10294 * @stateid: state ID to test
10295 * @cred: credential
10296 *
10297 * Returns NFS_OK if the server recognizes that "stateid" is valid.
10298 * Otherwise a negative NFS4ERR value is returned if the operation
10299 * failed or the state ID is not currently valid.
10300 */
nfs41_test_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)10301 static int nfs41_test_stateid(struct nfs_server *server,
10302 nfs4_stateid *stateid,
10303 const struct cred *cred)
10304 {
10305 struct nfs4_exception exception = {
10306 .interruptible = true,
10307 };
10308 int err;
10309 do {
10310 err = _nfs41_test_stateid(server, stateid, cred);
10311 nfs4_handle_delay_or_session_error(server, err, &exception);
10312 } while (exception.retry);
10313 return err;
10314 }
10315
10316 struct nfs_free_stateid_data {
10317 struct nfs_server *server;
10318 struct nfs41_free_stateid_args args;
10319 struct nfs41_free_stateid_res res;
10320 };
10321
nfs41_free_stateid_prepare(struct rpc_task * task,void * calldata)10322 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
10323 {
10324 struct nfs_free_stateid_data *data = calldata;
10325 nfs4_setup_sequence(data->server->nfs_client,
10326 &data->args.seq_args,
10327 &data->res.seq_res,
10328 task);
10329 }
10330
nfs41_free_stateid_done(struct rpc_task * task,void * calldata)10331 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
10332 {
10333 struct nfs_free_stateid_data *data = calldata;
10334
10335 nfs41_sequence_done(task, &data->res.seq_res);
10336
10337 switch (task->tk_status) {
10338 case -NFS4ERR_DELAY:
10339 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
10340 rpc_restart_call_prepare(task);
10341 }
10342 }
10343
nfs41_free_stateid_release(void * calldata)10344 static void nfs41_free_stateid_release(void *calldata)
10345 {
10346 struct nfs_free_stateid_data *data = calldata;
10347 struct nfs_client *clp = data->server->nfs_client;
10348
10349 nfs_put_client(clp);
10350 kfree(calldata);
10351 }
10352
10353 static const struct rpc_call_ops nfs41_free_stateid_ops = {
10354 .rpc_call_prepare = nfs41_free_stateid_prepare,
10355 .rpc_call_done = nfs41_free_stateid_done,
10356 .rpc_release = nfs41_free_stateid_release,
10357 };
10358
10359 /**
10360 * nfs41_free_stateid - perform a FREE_STATEID operation
10361 *
10362 * @server: server / transport on which to perform the operation
10363 * @stateid: state ID to release
10364 * @cred: credential
10365 * @privileged: set to true if this call needs to be privileged
10366 *
10367 * Note: this function is always asynchronous.
10368 */
nfs41_free_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred,bool privileged)10369 static int nfs41_free_stateid(struct nfs_server *server,
10370 const nfs4_stateid *stateid,
10371 const struct cred *cred,
10372 bool privileged)
10373 {
10374 struct rpc_message msg = {
10375 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
10376 .rpc_cred = cred,
10377 };
10378 struct rpc_task_setup task_setup = {
10379 .rpc_client = server->client,
10380 .rpc_message = &msg,
10381 .callback_ops = &nfs41_free_stateid_ops,
10382 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
10383 };
10384 struct nfs_free_stateid_data *data;
10385 struct rpc_task *task;
10386 struct nfs_client *clp = server->nfs_client;
10387
10388 if (!refcount_inc_not_zero(&clp->cl_count))
10389 return -EIO;
10390
10391 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10392 &task_setup.rpc_client, &msg);
10393
10394 dprintk("NFS call free_stateid %p\n", stateid);
10395 data = kmalloc(sizeof(*data), GFP_KERNEL);
10396 if (!data)
10397 return -ENOMEM;
10398 data->server = server;
10399 nfs4_stateid_copy(&data->args.stateid, stateid);
10400
10401 task_setup.callback_data = data;
10402
10403 msg.rpc_argp = &data->args;
10404 msg.rpc_resp = &data->res;
10405 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
10406 task = rpc_run_task(&task_setup);
10407 if (IS_ERR(task))
10408 return PTR_ERR(task);
10409 rpc_put_task(task);
10410 return 0;
10411 }
10412
10413 static void
nfs41_free_lock_state(struct nfs_server * server,struct nfs4_lock_state * lsp)10414 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
10415 {
10416 const struct cred *cred = lsp->ls_state->owner->so_cred;
10417
10418 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10419 nfs4_free_lock_state(server, lsp);
10420 }
10421
nfs41_match_stateid(const nfs4_stateid * s1,const nfs4_stateid * s2)10422 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10423 const nfs4_stateid *s2)
10424 {
10425 if (s1->type != s2->type)
10426 return false;
10427
10428 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10429 return false;
10430
10431 if (s1->seqid == s2->seqid)
10432 return true;
10433
10434 return s1->seqid == 0 || s2->seqid == 0;
10435 }
10436
10437 #endif /* CONFIG_NFS_V4_1 */
10438
nfs4_match_stateid(const nfs4_stateid * s1,const nfs4_stateid * s2)10439 static bool nfs4_match_stateid(const nfs4_stateid *s1,
10440 const nfs4_stateid *s2)
10441 {
10442 return nfs4_stateid_match(s1, s2);
10443 }
10444
10445
10446 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
10447 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10448 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10449 .recover_open = nfs4_open_reclaim,
10450 .recover_lock = nfs4_lock_reclaim,
10451 .establish_clid = nfs4_init_clientid,
10452 .detect_trunking = nfs40_discover_server_trunking,
10453 };
10454
10455 #if defined(CONFIG_NFS_V4_1)
10456 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10457 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10458 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10459 .recover_open = nfs4_open_reclaim,
10460 .recover_lock = nfs4_lock_reclaim,
10461 .establish_clid = nfs41_init_clientid,
10462 .reclaim_complete = nfs41_proc_reclaim_complete,
10463 .detect_trunking = nfs41_discover_server_trunking,
10464 };
10465 #endif /* CONFIG_NFS_V4_1 */
10466
10467 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
10468 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10469 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10470 .recover_open = nfs40_open_expired,
10471 .recover_lock = nfs4_lock_expired,
10472 .establish_clid = nfs4_init_clientid,
10473 };
10474
10475 #if defined(CONFIG_NFS_V4_1)
10476 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10477 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10478 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10479 .recover_open = nfs41_open_expired,
10480 .recover_lock = nfs41_lock_expired,
10481 .establish_clid = nfs41_init_clientid,
10482 };
10483 #endif /* CONFIG_NFS_V4_1 */
10484
10485 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
10486 .sched_state_renewal = nfs4_proc_async_renew,
10487 .get_state_renewal_cred = nfs4_get_renew_cred,
10488 .renew_lease = nfs4_proc_renew,
10489 };
10490
10491 #if defined(CONFIG_NFS_V4_1)
10492 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10493 .sched_state_renewal = nfs41_proc_async_sequence,
10494 .get_state_renewal_cred = nfs4_get_machine_cred,
10495 .renew_lease = nfs4_proc_sequence,
10496 };
10497 #endif
10498
10499 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
10500 .get_locations = _nfs40_proc_get_locations,
10501 .fsid_present = _nfs40_proc_fsid_present,
10502 };
10503
10504 #if defined(CONFIG_NFS_V4_1)
10505 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10506 .get_locations = _nfs41_proc_get_locations,
10507 .fsid_present = _nfs41_proc_fsid_present,
10508 };
10509 #endif /* CONFIG_NFS_V4_1 */
10510
10511 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
10512 .minor_version = 0,
10513 .init_caps = NFS_CAP_READDIRPLUS
10514 | NFS_CAP_ATOMIC_OPEN
10515 | NFS_CAP_POSIX_LOCK,
10516 .init_client = nfs40_init_client,
10517 .shutdown_client = nfs40_shutdown_client,
10518 .match_stateid = nfs4_match_stateid,
10519 .find_root_sec = nfs4_find_root_sec,
10520 .free_lock_state = nfs4_release_lockowner,
10521 .test_and_free_expired = nfs40_test_and_free_expired_stateid,
10522 .alloc_seqid = nfs_alloc_seqid,
10523 .call_sync_ops = &nfs40_call_sync_ops,
10524 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
10525 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
10526 .state_renewal_ops = &nfs40_state_renewal_ops,
10527 .mig_recovery_ops = &nfs40_mig_recovery_ops,
10528 };
10529
10530 #if defined(CONFIG_NFS_V4_1)
10531 static struct nfs_seqid *
nfs_alloc_no_seqid(struct nfs_seqid_counter * arg1,gfp_t arg2)10532 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10533 {
10534 return NULL;
10535 }
10536
10537 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10538 .minor_version = 1,
10539 .init_caps = NFS_CAP_READDIRPLUS
10540 | NFS_CAP_ATOMIC_OPEN
10541 | NFS_CAP_POSIX_LOCK
10542 | NFS_CAP_STATEID_NFSV41
10543 | NFS_CAP_ATOMIC_OPEN_V1
10544 | NFS_CAP_LGOPEN
10545 | NFS_CAP_MOVEABLE,
10546 .init_client = nfs41_init_client,
10547 .shutdown_client = nfs41_shutdown_client,
10548 .match_stateid = nfs41_match_stateid,
10549 .find_root_sec = nfs41_find_root_sec,
10550 .free_lock_state = nfs41_free_lock_state,
10551 .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10552 .alloc_seqid = nfs_alloc_no_seqid,
10553 .session_trunk = nfs4_test_session_trunk,
10554 .call_sync_ops = &nfs41_call_sync_ops,
10555 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10556 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10557 .state_renewal_ops = &nfs41_state_renewal_ops,
10558 .mig_recovery_ops = &nfs41_mig_recovery_ops,
10559 };
10560 #endif
10561
10562 #if defined(CONFIG_NFS_V4_2)
10563 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10564 .minor_version = 2,
10565 .init_caps = NFS_CAP_READDIRPLUS
10566 | NFS_CAP_ATOMIC_OPEN
10567 | NFS_CAP_POSIX_LOCK
10568 | NFS_CAP_STATEID_NFSV41
10569 | NFS_CAP_ATOMIC_OPEN_V1
10570 | NFS_CAP_LGOPEN
10571 | NFS_CAP_ALLOCATE
10572 | NFS_CAP_COPY
10573 | NFS_CAP_OFFLOAD_CANCEL
10574 | NFS_CAP_COPY_NOTIFY
10575 | NFS_CAP_DEALLOCATE
10576 | NFS_CAP_SEEK
10577 | NFS_CAP_LAYOUTSTATS
10578 | NFS_CAP_CLONE
10579 | NFS_CAP_LAYOUTERROR
10580 | NFS_CAP_READ_PLUS
10581 | NFS_CAP_MOVEABLE,
10582 .init_client = nfs41_init_client,
10583 .shutdown_client = nfs41_shutdown_client,
10584 .match_stateid = nfs41_match_stateid,
10585 .find_root_sec = nfs41_find_root_sec,
10586 .free_lock_state = nfs41_free_lock_state,
10587 .call_sync_ops = &nfs41_call_sync_ops,
10588 .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10589 .alloc_seqid = nfs_alloc_no_seqid,
10590 .session_trunk = nfs4_test_session_trunk,
10591 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10592 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10593 .state_renewal_ops = &nfs41_state_renewal_ops,
10594 .mig_recovery_ops = &nfs41_mig_recovery_ops,
10595 };
10596 #endif
10597
10598 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10599 [0] = &nfs_v4_0_minor_ops,
10600 #if defined(CONFIG_NFS_V4_1)
10601 [1] = &nfs_v4_1_minor_ops,
10602 #endif
10603 #if defined(CONFIG_NFS_V4_2)
10604 [2] = &nfs_v4_2_minor_ops,
10605 #endif
10606 };
10607
nfs4_listxattr(struct dentry * dentry,char * list,size_t size)10608 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10609 {
10610 ssize_t error, error2, error3;
10611 size_t left = size;
10612
10613 error = generic_listxattr(dentry, list, left);
10614 if (error < 0)
10615 return error;
10616 if (list) {
10617 list += error;
10618 left -= error;
10619 }
10620
10621 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, left);
10622 if (error2 < 0)
10623 return error2;
10624
10625 if (list) {
10626 list += error2;
10627 left -= error2;
10628 }
10629
10630 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, left);
10631 if (error3 < 0)
10632 return error3;
10633
10634 error += error2 + error3;
10635 if (size && error > size)
10636 return -ERANGE;
10637 return error;
10638 }
10639
nfs4_enable_swap(struct inode * inode)10640 static void nfs4_enable_swap(struct inode *inode)
10641 {
10642 /* The state manager thread must always be running.
10643 * It will notice the client is a swapper, and stay put.
10644 */
10645 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10646
10647 nfs4_schedule_state_manager(clp);
10648 }
10649
nfs4_disable_swap(struct inode * inode)10650 static void nfs4_disable_swap(struct inode *inode)
10651 {
10652 /* The state manager thread will now exit once it is
10653 * woken.
10654 */
10655 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10656
10657 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
10658 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
10659 wake_up_var(&clp->cl_state);
10660 }
10661
10662 static const struct inode_operations nfs4_dir_inode_operations = {
10663 .create = nfs_create,
10664 .lookup = nfs_lookup,
10665 .atomic_open = nfs_atomic_open,
10666 .link = nfs_link,
10667 .unlink = nfs_unlink,
10668 .symlink = nfs_symlink,
10669 .mkdir = nfs_mkdir,
10670 .rmdir = nfs_rmdir,
10671 .mknod = nfs_mknod,
10672 .rename = nfs_rename,
10673 .permission = nfs_permission,
10674 .getattr = nfs_getattr,
10675 .setattr = nfs_setattr,
10676 .listxattr = nfs4_listxattr,
10677 };
10678
10679 static const struct inode_operations nfs4_file_inode_operations = {
10680 .permission = nfs_permission,
10681 .getattr = nfs_getattr,
10682 .setattr = nfs_setattr,
10683 .listxattr = nfs4_listxattr,
10684 };
10685
10686 const struct nfs_rpc_ops nfs_v4_clientops = {
10687 .version = 4, /* protocol version */
10688 .dentry_ops = &nfs4_dentry_operations,
10689 .dir_inode_ops = &nfs4_dir_inode_operations,
10690 .file_inode_ops = &nfs4_file_inode_operations,
10691 .file_ops = &nfs4_file_operations,
10692 .getroot = nfs4_proc_get_root,
10693 .submount = nfs4_submount,
10694 .try_get_tree = nfs4_try_get_tree,
10695 .getattr = nfs4_proc_getattr,
10696 .setattr = nfs4_proc_setattr,
10697 .lookup = nfs4_proc_lookup,
10698 .lookupp = nfs4_proc_lookupp,
10699 .access = nfs4_proc_access,
10700 .readlink = nfs4_proc_readlink,
10701 .create = nfs4_proc_create,
10702 .remove = nfs4_proc_remove,
10703 .unlink_setup = nfs4_proc_unlink_setup,
10704 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10705 .unlink_done = nfs4_proc_unlink_done,
10706 .rename_setup = nfs4_proc_rename_setup,
10707 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10708 .rename_done = nfs4_proc_rename_done,
10709 .link = nfs4_proc_link,
10710 .symlink = nfs4_proc_symlink,
10711 .mkdir = nfs4_proc_mkdir,
10712 .rmdir = nfs4_proc_rmdir,
10713 .readdir = nfs4_proc_readdir,
10714 .mknod = nfs4_proc_mknod,
10715 .statfs = nfs4_proc_statfs,
10716 .fsinfo = nfs4_proc_fsinfo,
10717 .pathconf = nfs4_proc_pathconf,
10718 .set_capabilities = nfs4_server_capabilities,
10719 .decode_dirent = nfs4_decode_dirent,
10720 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10721 .read_setup = nfs4_proc_read_setup,
10722 .read_done = nfs4_read_done,
10723 .write_setup = nfs4_proc_write_setup,
10724 .write_done = nfs4_write_done,
10725 .commit_setup = nfs4_proc_commit_setup,
10726 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10727 .commit_done = nfs4_commit_done,
10728 .lock = nfs4_proc_lock,
10729 .clear_acl_cache = nfs4_zap_acl_attr,
10730 .close_context = nfs4_close_context,
10731 .open_context = nfs4_atomic_open,
10732 .have_delegation = nfs4_have_delegation,
10733 .alloc_client = nfs4_alloc_client,
10734 .init_client = nfs4_init_client,
10735 .free_client = nfs4_free_client,
10736 .create_server = nfs4_create_server,
10737 .clone_server = nfs_clone_server,
10738 .discover_trunking = nfs4_discover_trunking,
10739 .enable_swap = nfs4_enable_swap,
10740 .disable_swap = nfs4_disable_swap,
10741 };
10742
10743 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10744 .name = XATTR_NAME_NFSV4_ACL,
10745 .list = nfs4_xattr_list_nfs4_acl,
10746 .get = nfs4_xattr_get_nfs4_acl,
10747 .set = nfs4_xattr_set_nfs4_acl,
10748 };
10749
10750 #if defined(CONFIG_NFS_V4_1)
10751 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = {
10752 .name = XATTR_NAME_NFSV4_DACL,
10753 .list = nfs4_xattr_list_nfs4_dacl,
10754 .get = nfs4_xattr_get_nfs4_dacl,
10755 .set = nfs4_xattr_set_nfs4_dacl,
10756 };
10757
10758 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = {
10759 .name = XATTR_NAME_NFSV4_SACL,
10760 .list = nfs4_xattr_list_nfs4_sacl,
10761 .get = nfs4_xattr_get_nfs4_sacl,
10762 .set = nfs4_xattr_set_nfs4_sacl,
10763 };
10764 #endif
10765
10766 #ifdef CONFIG_NFS_V4_2
10767 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
10768 .prefix = XATTR_USER_PREFIX,
10769 .get = nfs4_xattr_get_nfs4_user,
10770 .set = nfs4_xattr_set_nfs4_user,
10771 };
10772 #endif
10773
10774 const struct xattr_handler *nfs4_xattr_handlers[] = {
10775 &nfs4_xattr_nfs4_acl_handler,
10776 #if defined(CONFIG_NFS_V4_1)
10777 &nfs4_xattr_nfs4_dacl_handler,
10778 &nfs4_xattr_nfs4_sacl_handler,
10779 #endif
10780 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10781 &nfs4_xattr_nfs4_label_handler,
10782 #endif
10783 #ifdef CONFIG_NFS_V4_2
10784 &nfs4_xattr_nfs4_user_handler,
10785 #endif
10786 NULL
10787 };
10788