1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/nfs/nfs3proc.c
4 *
5 * Client-side NFSv3 procedures stubs.
6 *
7 * Copyright (C) 1997, Olaf Kirch
8 */
9
10 #include <linux/mm.h>
11 #include <linux/errno.h>
12 #include <linux/string.h>
13 #include <linux/sunrpc/clnt.h>
14 #include <linux/slab.h>
15 #include <linux/nfs.h>
16 #include <linux/nfs3.h>
17 #include <linux/nfs_fs.h>
18 #include <linux/nfs_page.h>
19 #include <linux/lockd/bind.h>
20 #include <linux/nfs_mount.h>
21 #include <linux/freezer.h>
22 #include <linux/xattr.h>
23
24 #include "iostat.h"
25 #include "internal.h"
26 #include "nfs3_fs.h"
27
28 #define NFSDBG_FACILITY NFSDBG_PROC
29
30 /* A wrapper to handle the EJUKEBOX error messages */
31 static int
nfs3_rpc_wrapper(struct rpc_clnt * clnt,struct rpc_message * msg,int flags)32 nfs3_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
33 {
34 int res;
35 do {
36 res = rpc_call_sync(clnt, msg, flags);
37 if (res != -EJUKEBOX)
38 break;
39 __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
40 schedule_timeout(NFS_JUKEBOX_RETRY_TIME);
41 res = -ERESTARTSYS;
42 } while (!fatal_signal_pending(current));
43 return res;
44 }
45
46 #define rpc_call_sync(clnt, msg, flags) nfs3_rpc_wrapper(clnt, msg, flags)
47
48 static int
nfs3_async_handle_jukebox(struct rpc_task * task,struct inode * inode)49 nfs3_async_handle_jukebox(struct rpc_task *task, struct inode *inode)
50 {
51 if (task->tk_status != -EJUKEBOX)
52 return 0;
53 nfs_inc_stats(inode, NFSIOS_DELAY);
54 task->tk_status = 0;
55 rpc_restart_call(task);
56 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
57 return 1;
58 }
59
60 static int
do_proc_get_root(struct rpc_clnt * client,struct nfs_fh * fhandle,struct nfs_fsinfo * info)61 do_proc_get_root(struct rpc_clnt *client, struct nfs_fh *fhandle,
62 struct nfs_fsinfo *info)
63 {
64 struct rpc_message msg = {
65 .rpc_proc = &nfs3_procedures[NFS3PROC_FSINFO],
66 .rpc_argp = fhandle,
67 .rpc_resp = info,
68 };
69 int status;
70
71 dprintk("%s: call fsinfo\n", __func__);
72 nfs_fattr_init(info->fattr);
73 status = rpc_call_sync(client, &msg, 0);
74 dprintk("%s: reply fsinfo: %d\n", __func__, status);
75 if (status == 0 && !(info->fattr->valid & NFS_ATTR_FATTR)) {
76 msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
77 msg.rpc_resp = info->fattr;
78 status = rpc_call_sync(client, &msg, 0);
79 dprintk("%s: reply getattr: %d\n", __func__, status);
80 }
81 return status;
82 }
83
84 /*
85 * Bare-bones access to getattr: this is for nfs_get_root/nfs_get_sb
86 */
87 static int
nfs3_proc_get_root(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)88 nfs3_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
89 struct nfs_fsinfo *info)
90 {
91 int status;
92
93 status = do_proc_get_root(server->client, fhandle, info);
94 if (status && server->nfs_client->cl_rpcclient != server->client)
95 status = do_proc_get_root(server->nfs_client->cl_rpcclient, fhandle, info);
96 return status;
97 }
98
99 /*
100 * One function for each procedure in the NFS protocol.
101 */
102 static int
nfs3_proc_getattr(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct inode * inode)103 nfs3_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
104 struct nfs_fattr *fattr, struct inode *inode)
105 {
106 struct rpc_message msg = {
107 .rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR],
108 .rpc_argp = fhandle,
109 .rpc_resp = fattr,
110 };
111 int status;
112 unsigned short task_flags = 0;
113
114 /* Is this is an attribute revalidation, subject to softreval? */
115 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
116 task_flags |= RPC_TASK_TIMEOUT;
117
118 dprintk("NFS call getattr\n");
119 nfs_fattr_init(fattr);
120 status = rpc_call_sync(server->client, &msg, task_flags);
121 dprintk("NFS reply getattr: %d\n", status);
122 return status;
123 }
124
125 static int
nfs3_proc_setattr(struct dentry * dentry,struct nfs_fattr * fattr,struct iattr * sattr)126 nfs3_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
127 struct iattr *sattr)
128 {
129 struct inode *inode = d_inode(dentry);
130 struct nfs3_sattrargs arg = {
131 .fh = NFS_FH(inode),
132 .sattr = sattr,
133 };
134 struct rpc_message msg = {
135 .rpc_proc = &nfs3_procedures[NFS3PROC_SETATTR],
136 .rpc_argp = &arg,
137 .rpc_resp = fattr,
138 };
139 int status;
140
141 dprintk("NFS call setattr\n");
142 if (sattr->ia_valid & ATTR_FILE)
143 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
144 nfs_fattr_init(fattr);
145 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
146 if (status == 0) {
147 nfs_setattr_update_inode(inode, sattr, fattr);
148 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
149 nfs_zap_acl_cache(inode);
150 }
151 dprintk("NFS reply setattr: %d\n", status);
152 return status;
153 }
154
155 static int
__nfs3_proc_lookup(struct inode * dir,const char * name,size_t len,struct nfs_fh * fhandle,struct nfs_fattr * fattr,unsigned short task_flags)156 __nfs3_proc_lookup(struct inode *dir, const char *name, size_t len,
157 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
158 unsigned short task_flags)
159 {
160 struct nfs3_diropargs arg = {
161 .fh = NFS_FH(dir),
162 .name = name,
163 .len = len
164 };
165 struct nfs3_diropres res = {
166 .fh = fhandle,
167 .fattr = fattr
168 };
169 struct rpc_message msg = {
170 .rpc_proc = &nfs3_procedures[NFS3PROC_LOOKUP],
171 .rpc_argp = &arg,
172 .rpc_resp = &res,
173 };
174 int status;
175
176 res.dir_attr = nfs_alloc_fattr();
177 if (res.dir_attr == NULL)
178 return -ENOMEM;
179
180 nfs_fattr_init(fattr);
181 status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags);
182 nfs_refresh_inode(dir, res.dir_attr);
183 if (status >= 0 && !(fattr->valid & NFS_ATTR_FATTR)) {
184 msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
185 msg.rpc_argp = fhandle;
186 msg.rpc_resp = fattr;
187 status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags);
188 }
189 nfs_free_fattr(res.dir_attr);
190 dprintk("NFS reply lookup: %d\n", status);
191 return status;
192 }
193
194 static int
nfs3_proc_lookup(struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)195 nfs3_proc_lookup(struct inode *dir, struct dentry *dentry,
196 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
197 {
198 unsigned short task_flags = 0;
199
200 /* Is this is an attribute revalidation, subject to softreval? */
201 if (nfs_lookup_is_soft_revalidate(dentry))
202 task_flags |= RPC_TASK_TIMEOUT;
203
204 dprintk("NFS call lookup %pd2\n", dentry);
205 return __nfs3_proc_lookup(dir, dentry->d_name.name,
206 dentry->d_name.len, fhandle, fattr,
207 task_flags);
208 }
209
nfs3_proc_lookupp(struct inode * inode,struct nfs_fh * fhandle,struct nfs_fattr * fattr)210 static int nfs3_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
211 struct nfs_fattr *fattr)
212 {
213 const char dotdot[] = "..";
214 const size_t len = strlen(dotdot);
215 unsigned short task_flags = 0;
216
217 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
218 task_flags |= RPC_TASK_TIMEOUT;
219
220 return __nfs3_proc_lookup(inode, dotdot, len, fhandle, fattr,
221 task_flags);
222 }
223
nfs3_proc_access(struct inode * inode,struct nfs_access_entry * entry,const struct cred * cred)224 static int nfs3_proc_access(struct inode *inode, struct nfs_access_entry *entry,
225 const struct cred *cred)
226 {
227 struct nfs3_accessargs arg = {
228 .fh = NFS_FH(inode),
229 .access = entry->mask,
230 };
231 struct nfs3_accessres res;
232 struct rpc_message msg = {
233 .rpc_proc = &nfs3_procedures[NFS3PROC_ACCESS],
234 .rpc_argp = &arg,
235 .rpc_resp = &res,
236 .rpc_cred = cred,
237 };
238 int status = -ENOMEM;
239
240 dprintk("NFS call access\n");
241 res.fattr = nfs_alloc_fattr();
242 if (res.fattr == NULL)
243 goto out;
244
245 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
246 nfs_refresh_inode(inode, res.fattr);
247 if (status == 0)
248 nfs_access_set_mask(entry, res.access);
249 nfs_free_fattr(res.fattr);
250 out:
251 dprintk("NFS reply access: %d\n", status);
252 return status;
253 }
254
nfs3_proc_readlink(struct inode * inode,struct page * page,unsigned int pgbase,unsigned int pglen)255 static int nfs3_proc_readlink(struct inode *inode, struct page *page,
256 unsigned int pgbase, unsigned int pglen)
257 {
258 struct nfs_fattr *fattr;
259 struct nfs3_readlinkargs args = {
260 .fh = NFS_FH(inode),
261 .pgbase = pgbase,
262 .pglen = pglen,
263 .pages = &page
264 };
265 struct rpc_message msg = {
266 .rpc_proc = &nfs3_procedures[NFS3PROC_READLINK],
267 .rpc_argp = &args,
268 };
269 int status = -ENOMEM;
270
271 dprintk("NFS call readlink\n");
272 fattr = nfs_alloc_fattr();
273 if (fattr == NULL)
274 goto out;
275 msg.rpc_resp = fattr;
276
277 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
278 nfs_refresh_inode(inode, fattr);
279 nfs_free_fattr(fattr);
280 out:
281 dprintk("NFS reply readlink: %d\n", status);
282 return status;
283 }
284
285 struct nfs3_createdata {
286 struct rpc_message msg;
287 union {
288 struct nfs3_createargs create;
289 struct nfs3_mkdirargs mkdir;
290 struct nfs3_symlinkargs symlink;
291 struct nfs3_mknodargs mknod;
292 } arg;
293 struct nfs3_diropres res;
294 struct nfs_fh fh;
295 struct nfs_fattr fattr;
296 struct nfs_fattr dir_attr;
297 };
298
nfs3_alloc_createdata(void)299 static struct nfs3_createdata *nfs3_alloc_createdata(void)
300 {
301 struct nfs3_createdata *data;
302
303 data = kzalloc(sizeof(*data), GFP_KERNEL);
304 if (data != NULL) {
305 data->msg.rpc_argp = &data->arg;
306 data->msg.rpc_resp = &data->res;
307 data->res.fh = &data->fh;
308 data->res.fattr = &data->fattr;
309 data->res.dir_attr = &data->dir_attr;
310 nfs_fattr_init(data->res.fattr);
311 nfs_fattr_init(data->res.dir_attr);
312 }
313 return data;
314 }
315
316 static struct dentry *
nfs3_do_create(struct inode * dir,struct dentry * dentry,struct nfs3_createdata * data)317 nfs3_do_create(struct inode *dir, struct dentry *dentry, struct nfs3_createdata *data)
318 {
319 int status;
320
321 status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
322 nfs_post_op_update_inode(dir, data->res.dir_attr);
323 if (status != 0)
324 return ERR_PTR(status);
325
326 return nfs_add_or_obtain(dentry, data->res.fh, data->res.fattr);
327 }
328
nfs3_free_createdata(struct nfs3_createdata * data)329 static void nfs3_free_createdata(struct nfs3_createdata *data)
330 {
331 kfree(data);
332 }
333
334 /*
335 * Create a regular file.
336 */
337 static int
nfs3_proc_create(struct inode * dir,struct dentry * dentry,struct iattr * sattr,int flags)338 nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
339 int flags)
340 {
341 struct posix_acl *default_acl, *acl;
342 struct nfs3_createdata *data;
343 struct dentry *d_alias;
344 int status = -ENOMEM;
345
346 dprintk("NFS call create %pd\n", dentry);
347
348 data = nfs3_alloc_createdata();
349 if (data == NULL)
350 goto out;
351
352 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_CREATE];
353 data->arg.create.fh = NFS_FH(dir);
354 data->arg.create.name = dentry->d_name.name;
355 data->arg.create.len = dentry->d_name.len;
356 data->arg.create.sattr = sattr;
357
358 data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
359 if (flags & O_EXCL) {
360 data->arg.create.createmode = NFS3_CREATE_EXCLUSIVE;
361 data->arg.create.verifier[0] = cpu_to_be32(jiffies);
362 data->arg.create.verifier[1] = cpu_to_be32(current->pid);
363 }
364
365 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
366 if (status)
367 goto out;
368
369 for (;;) {
370 d_alias = nfs3_do_create(dir, dentry, data);
371 status = PTR_ERR_OR_ZERO(d_alias);
372
373 if (status != -ENOTSUPP)
374 break;
375 /* If the server doesn't support the exclusive creation
376 * semantics, try again with simple 'guarded' mode. */
377 switch (data->arg.create.createmode) {
378 case NFS3_CREATE_EXCLUSIVE:
379 data->arg.create.createmode = NFS3_CREATE_GUARDED;
380 break;
381
382 case NFS3_CREATE_GUARDED:
383 data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
384 break;
385
386 case NFS3_CREATE_UNCHECKED:
387 goto out_release_acls;
388 }
389 nfs_fattr_init(data->res.dir_attr);
390 nfs_fattr_init(data->res.fattr);
391 }
392
393 if (status != 0)
394 goto out_release_acls;
395
396 if (d_alias)
397 dentry = d_alias;
398
399 /* When we created the file with exclusive semantics, make
400 * sure we set the attributes afterwards. */
401 if (data->arg.create.createmode == NFS3_CREATE_EXCLUSIVE) {
402 dprintk("NFS call setattr (post-create)\n");
403
404 if (!(sattr->ia_valid & ATTR_ATIME_SET))
405 sattr->ia_valid |= ATTR_ATIME;
406 if (!(sattr->ia_valid & ATTR_MTIME_SET))
407 sattr->ia_valid |= ATTR_MTIME;
408
409 /* Note: we could use a guarded setattr here, but I'm
410 * not sure this buys us anything (and I'd have
411 * to revamp the NFSv3 XDR code) */
412 status = nfs3_proc_setattr(dentry, data->res.fattr, sattr);
413 nfs_post_op_update_inode(d_inode(dentry), data->res.fattr);
414 dprintk("NFS reply setattr (post-create): %d\n", status);
415 if (status != 0)
416 goto out_dput;
417 }
418
419 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
420
421 out_dput:
422 dput(d_alias);
423 out_release_acls:
424 posix_acl_release(acl);
425 posix_acl_release(default_acl);
426 out:
427 nfs3_free_createdata(data);
428 dprintk("NFS reply create: %d\n", status);
429 return status;
430 }
431
432 static int
nfs3_proc_remove(struct inode * dir,struct dentry * dentry)433 nfs3_proc_remove(struct inode *dir, struct dentry *dentry)
434 {
435 struct nfs_removeargs arg = {
436 .fh = NFS_FH(dir),
437 .name = dentry->d_name,
438 };
439 struct nfs_removeres res;
440 struct rpc_message msg = {
441 .rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE],
442 .rpc_argp = &arg,
443 .rpc_resp = &res,
444 };
445 int status = -ENOMEM;
446
447 dprintk("NFS call remove %pd2\n", dentry);
448 res.dir_attr = nfs_alloc_fattr();
449 if (res.dir_attr == NULL)
450 goto out;
451
452 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
453 nfs_post_op_update_inode(dir, res.dir_attr);
454 nfs_free_fattr(res.dir_attr);
455 out:
456 dprintk("NFS reply remove: %d\n", status);
457 return status;
458 }
459
460 static void
nfs3_proc_unlink_setup(struct rpc_message * msg,struct dentry * dentry,struct inode * inode)461 nfs3_proc_unlink_setup(struct rpc_message *msg,
462 struct dentry *dentry,
463 struct inode *inode)
464 {
465 msg->rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE];
466 }
467
nfs3_proc_unlink_rpc_prepare(struct rpc_task * task,struct nfs_unlinkdata * data)468 static void nfs3_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
469 {
470 rpc_call_start(task);
471 }
472
473 static int
nfs3_proc_unlink_done(struct rpc_task * task,struct inode * dir)474 nfs3_proc_unlink_done(struct rpc_task *task, struct inode *dir)
475 {
476 struct nfs_removeres *res;
477 if (nfs3_async_handle_jukebox(task, dir))
478 return 0;
479 res = task->tk_msg.rpc_resp;
480 nfs_post_op_update_inode(dir, res->dir_attr);
481 return 1;
482 }
483
484 static void
nfs3_proc_rename_setup(struct rpc_message * msg,struct dentry * old_dentry,struct dentry * new_dentry)485 nfs3_proc_rename_setup(struct rpc_message *msg,
486 struct dentry *old_dentry,
487 struct dentry *new_dentry)
488 {
489 msg->rpc_proc = &nfs3_procedures[NFS3PROC_RENAME];
490 }
491
nfs3_proc_rename_rpc_prepare(struct rpc_task * task,struct nfs_renamedata * data)492 static void nfs3_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
493 {
494 rpc_call_start(task);
495 }
496
497 static int
nfs3_proc_rename_done(struct rpc_task * task,struct inode * old_dir,struct inode * new_dir)498 nfs3_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
499 struct inode *new_dir)
500 {
501 struct nfs_renameres *res;
502
503 if (nfs3_async_handle_jukebox(task, old_dir))
504 return 0;
505 res = task->tk_msg.rpc_resp;
506
507 nfs_post_op_update_inode(old_dir, res->old_fattr);
508 nfs_post_op_update_inode(new_dir, res->new_fattr);
509 return 1;
510 }
511
512 static int
nfs3_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)513 nfs3_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
514 {
515 struct nfs3_linkargs arg = {
516 .fromfh = NFS_FH(inode),
517 .tofh = NFS_FH(dir),
518 .toname = name->name,
519 .tolen = name->len
520 };
521 struct nfs3_linkres res;
522 struct rpc_message msg = {
523 .rpc_proc = &nfs3_procedures[NFS3PROC_LINK],
524 .rpc_argp = &arg,
525 .rpc_resp = &res,
526 };
527 int status = -ENOMEM;
528
529 dprintk("NFS call link %s\n", name->name);
530 res.fattr = nfs_alloc_fattr();
531 res.dir_attr = nfs_alloc_fattr();
532 if (res.fattr == NULL || res.dir_attr == NULL)
533 goto out;
534
535 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
536 nfs_post_op_update_inode(dir, res.dir_attr);
537 nfs_post_op_update_inode(inode, res.fattr);
538 out:
539 nfs_free_fattr(res.dir_attr);
540 nfs_free_fattr(res.fattr);
541 dprintk("NFS reply link: %d\n", status);
542 return status;
543 }
544
545 static int
nfs3_proc_symlink(struct inode * dir,struct dentry * dentry,struct page * page,unsigned int len,struct iattr * sattr)546 nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
547 unsigned int len, struct iattr *sattr)
548 {
549 struct nfs3_createdata *data;
550 struct dentry *d_alias;
551 int status = -ENOMEM;
552
553 if (len > NFS3_MAXPATHLEN)
554 return -ENAMETOOLONG;
555
556 dprintk("NFS call symlink %pd\n", dentry);
557
558 data = nfs3_alloc_createdata();
559 if (data == NULL)
560 goto out;
561 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK];
562 data->arg.symlink.fromfh = NFS_FH(dir);
563 data->arg.symlink.fromname = dentry->d_name.name;
564 data->arg.symlink.fromlen = dentry->d_name.len;
565 data->arg.symlink.pages = &page;
566 data->arg.symlink.pathlen = len;
567 data->arg.symlink.sattr = sattr;
568
569 d_alias = nfs3_do_create(dir, dentry, data);
570 status = PTR_ERR_OR_ZERO(d_alias);
571
572 if (status == 0)
573 dput(d_alias);
574
575 nfs3_free_createdata(data);
576 out:
577 dprintk("NFS reply symlink: %d\n", status);
578 return status;
579 }
580
581 static int
nfs3_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr)582 nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
583 {
584 struct posix_acl *default_acl, *acl;
585 struct nfs3_createdata *data;
586 struct dentry *d_alias;
587 int status = -ENOMEM;
588
589 dprintk("NFS call mkdir %pd\n", dentry);
590
591 data = nfs3_alloc_createdata();
592 if (data == NULL)
593 goto out;
594
595 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
596 if (status)
597 goto out;
598
599 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR];
600 data->arg.mkdir.fh = NFS_FH(dir);
601 data->arg.mkdir.name = dentry->d_name.name;
602 data->arg.mkdir.len = dentry->d_name.len;
603 data->arg.mkdir.sattr = sattr;
604
605 d_alias = nfs3_do_create(dir, dentry, data);
606 status = PTR_ERR_OR_ZERO(d_alias);
607
608 if (status != 0)
609 goto out_release_acls;
610
611 if (d_alias)
612 dentry = d_alias;
613
614 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
615
616 dput(d_alias);
617 out_release_acls:
618 posix_acl_release(acl);
619 posix_acl_release(default_acl);
620 out:
621 nfs3_free_createdata(data);
622 dprintk("NFS reply mkdir: %d\n", status);
623 return status;
624 }
625
626 static int
nfs3_proc_rmdir(struct inode * dir,const struct qstr * name)627 nfs3_proc_rmdir(struct inode *dir, const struct qstr *name)
628 {
629 struct nfs_fattr *dir_attr;
630 struct nfs3_diropargs arg = {
631 .fh = NFS_FH(dir),
632 .name = name->name,
633 .len = name->len
634 };
635 struct rpc_message msg = {
636 .rpc_proc = &nfs3_procedures[NFS3PROC_RMDIR],
637 .rpc_argp = &arg,
638 };
639 int status = -ENOMEM;
640
641 dprintk("NFS call rmdir %s\n", name->name);
642 dir_attr = nfs_alloc_fattr();
643 if (dir_attr == NULL)
644 goto out;
645
646 msg.rpc_resp = dir_attr;
647 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
648 nfs_post_op_update_inode(dir, dir_attr);
649 nfs_free_fattr(dir_attr);
650 out:
651 dprintk("NFS reply rmdir: %d\n", status);
652 return status;
653 }
654
655 /*
656 * The READDIR implementation is somewhat hackish - we pass the user buffer
657 * to the encode function, which installs it in the receive iovec.
658 * The decode function itself doesn't perform any decoding, it just makes
659 * sure the reply is syntactically correct.
660 *
661 * Also note that this implementation handles both plain readdir and
662 * readdirplus.
663 */
nfs3_proc_readdir(struct nfs_readdir_arg * nr_arg,struct nfs_readdir_res * nr_res)664 static int nfs3_proc_readdir(struct nfs_readdir_arg *nr_arg,
665 struct nfs_readdir_res *nr_res)
666 {
667 struct inode *dir = d_inode(nr_arg->dentry);
668 struct nfs3_readdirargs arg = {
669 .fh = NFS_FH(dir),
670 .cookie = nr_arg->cookie,
671 .plus = nr_arg->plus,
672 .count = nr_arg->page_len,
673 .pages = nr_arg->pages
674 };
675 struct nfs3_readdirres res = {
676 .verf = nr_res->verf,
677 .plus = nr_arg->plus,
678 };
679 struct rpc_message msg = {
680 .rpc_proc = &nfs3_procedures[NFS3PROC_READDIR],
681 .rpc_argp = &arg,
682 .rpc_resp = &res,
683 .rpc_cred = nr_arg->cred,
684 };
685 int status = -ENOMEM;
686
687 if (nr_arg->plus)
688 msg.rpc_proc = &nfs3_procedures[NFS3PROC_READDIRPLUS];
689 if (arg.cookie)
690 memcpy(arg.verf, nr_arg->verf, sizeof(arg.verf));
691
692 dprintk("NFS call readdir%s %llu\n", nr_arg->plus ? "plus" : "",
693 (unsigned long long)nr_arg->cookie);
694
695 res.dir_attr = nfs_alloc_fattr();
696 if (res.dir_attr == NULL)
697 goto out;
698
699 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
700
701 nfs_invalidate_atime(dir);
702 nfs_refresh_inode(dir, res.dir_attr);
703
704 nfs_free_fattr(res.dir_attr);
705 out:
706 dprintk("NFS reply readdir%s: %d\n", nr_arg->plus ? "plus" : "",
707 status);
708 return status;
709 }
710
711 static int
nfs3_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,dev_t rdev)712 nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
713 dev_t rdev)
714 {
715 struct posix_acl *default_acl, *acl;
716 struct nfs3_createdata *data;
717 struct dentry *d_alias;
718 int status = -ENOMEM;
719
720 dprintk("NFS call mknod %pd %u:%u\n", dentry,
721 MAJOR(rdev), MINOR(rdev));
722
723 data = nfs3_alloc_createdata();
724 if (data == NULL)
725 goto out;
726
727 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
728 if (status)
729 goto out;
730
731 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD];
732 data->arg.mknod.fh = NFS_FH(dir);
733 data->arg.mknod.name = dentry->d_name.name;
734 data->arg.mknod.len = dentry->d_name.len;
735 data->arg.mknod.sattr = sattr;
736 data->arg.mknod.rdev = rdev;
737
738 switch (sattr->ia_mode & S_IFMT) {
739 case S_IFBLK:
740 data->arg.mknod.type = NF3BLK;
741 break;
742 case S_IFCHR:
743 data->arg.mknod.type = NF3CHR;
744 break;
745 case S_IFIFO:
746 data->arg.mknod.type = NF3FIFO;
747 break;
748 case S_IFSOCK:
749 data->arg.mknod.type = NF3SOCK;
750 break;
751 default:
752 status = -EINVAL;
753 goto out_release_acls;
754 }
755
756 d_alias = nfs3_do_create(dir, dentry, data);
757 status = PTR_ERR_OR_ZERO(d_alias);
758 if (status != 0)
759 goto out_release_acls;
760
761 if (d_alias)
762 dentry = d_alias;
763
764 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
765
766 dput(d_alias);
767 out_release_acls:
768 posix_acl_release(acl);
769 posix_acl_release(default_acl);
770 out:
771 nfs3_free_createdata(data);
772 dprintk("NFS reply mknod: %d\n", status);
773 return status;
774 }
775
776 static int
nfs3_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * stat)777 nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
778 struct nfs_fsstat *stat)
779 {
780 struct rpc_message msg = {
781 .rpc_proc = &nfs3_procedures[NFS3PROC_FSSTAT],
782 .rpc_argp = fhandle,
783 .rpc_resp = stat,
784 };
785 int status;
786
787 dprintk("NFS call fsstat\n");
788 nfs_fattr_init(stat->fattr);
789 status = rpc_call_sync(server->client, &msg, 0);
790 dprintk("NFS reply fsstat: %d\n", status);
791 return status;
792 }
793
794 static int
do_proc_fsinfo(struct rpc_clnt * client,struct nfs_fh * fhandle,struct nfs_fsinfo * info)795 do_proc_fsinfo(struct rpc_clnt *client, struct nfs_fh *fhandle,
796 struct nfs_fsinfo *info)
797 {
798 struct rpc_message msg = {
799 .rpc_proc = &nfs3_procedures[NFS3PROC_FSINFO],
800 .rpc_argp = fhandle,
801 .rpc_resp = info,
802 };
803 int status;
804
805 dprintk("NFS call fsinfo\n");
806 nfs_fattr_init(info->fattr);
807 status = rpc_call_sync(client, &msg, 0);
808 dprintk("NFS reply fsinfo: %d\n", status);
809 return status;
810 }
811
812 /*
813 * Bare-bones access to fsinfo: this is for nfs_get_root/nfs_get_sb via
814 * nfs_create_server
815 */
816 static int
nfs3_proc_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)817 nfs3_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
818 struct nfs_fsinfo *info)
819 {
820 int status;
821
822 status = do_proc_fsinfo(server->client, fhandle, info);
823 if (status && server->nfs_client->cl_rpcclient != server->client)
824 status = do_proc_fsinfo(server->nfs_client->cl_rpcclient, fhandle, info);
825 return status;
826 }
827
828 static int
nfs3_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * info)829 nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
830 struct nfs_pathconf *info)
831 {
832 struct rpc_message msg = {
833 .rpc_proc = &nfs3_procedures[NFS3PROC_PATHCONF],
834 .rpc_argp = fhandle,
835 .rpc_resp = info,
836 };
837 int status;
838
839 dprintk("NFS call pathconf\n");
840 nfs_fattr_init(info->fattr);
841 status = rpc_call_sync(server->client, &msg, 0);
842 dprintk("NFS reply pathconf: %d\n", status);
843 return status;
844 }
845
nfs3_read_done(struct rpc_task * task,struct nfs_pgio_header * hdr)846 static int nfs3_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
847 {
848 struct inode *inode = hdr->inode;
849 struct nfs_server *server = NFS_SERVER(inode);
850
851 if (hdr->pgio_done_cb != NULL)
852 return hdr->pgio_done_cb(task, hdr);
853
854 if (nfs3_async_handle_jukebox(task, inode))
855 return -EAGAIN;
856
857 if (task->tk_status >= 0 && !server->read_hdrsize)
858 cmpxchg(&server->read_hdrsize, 0, hdr->res.replen);
859
860 nfs_invalidate_atime(inode);
861 nfs_refresh_inode(inode, &hdr->fattr);
862 return 0;
863 }
864
nfs3_proc_read_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg)865 static void nfs3_proc_read_setup(struct nfs_pgio_header *hdr,
866 struct rpc_message *msg)
867 {
868 msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ];
869 hdr->args.replen = NFS_SERVER(hdr->inode)->read_hdrsize;
870 }
871
nfs3_proc_pgio_rpc_prepare(struct rpc_task * task,struct nfs_pgio_header * hdr)872 static int nfs3_proc_pgio_rpc_prepare(struct rpc_task *task,
873 struct nfs_pgio_header *hdr)
874 {
875 rpc_call_start(task);
876 return 0;
877 }
878
nfs3_write_done(struct rpc_task * task,struct nfs_pgio_header * hdr)879 static int nfs3_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
880 {
881 struct inode *inode = hdr->inode;
882
883 if (hdr->pgio_done_cb != NULL)
884 return hdr->pgio_done_cb(task, hdr);
885
886 if (nfs3_async_handle_jukebox(task, inode))
887 return -EAGAIN;
888 if (task->tk_status >= 0)
889 nfs_writeback_update_inode(hdr);
890 return 0;
891 }
892
nfs3_proc_write_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg,struct rpc_clnt ** clnt)893 static void nfs3_proc_write_setup(struct nfs_pgio_header *hdr,
894 struct rpc_message *msg,
895 struct rpc_clnt **clnt)
896 {
897 msg->rpc_proc = &nfs3_procedures[NFS3PROC_WRITE];
898 }
899
nfs3_proc_commit_rpc_prepare(struct rpc_task * task,struct nfs_commit_data * data)900 static void nfs3_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
901 {
902 rpc_call_start(task);
903 }
904
nfs3_commit_done(struct rpc_task * task,struct nfs_commit_data * data)905 static int nfs3_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
906 {
907 if (data->commit_done_cb != NULL)
908 return data->commit_done_cb(task, data);
909
910 if (nfs3_async_handle_jukebox(task, data->inode))
911 return -EAGAIN;
912 nfs_refresh_inode(data->inode, data->res.fattr);
913 return 0;
914 }
915
nfs3_proc_commit_setup(struct nfs_commit_data * data,struct rpc_message * msg,struct rpc_clnt ** clnt)916 static void nfs3_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
917 struct rpc_clnt **clnt)
918 {
919 msg->rpc_proc = &nfs3_procedures[NFS3PROC_COMMIT];
920 }
921
nfs3_nlm_alloc_call(void * data)922 static void nfs3_nlm_alloc_call(void *data)
923 {
924 struct nfs_lock_context *l_ctx = data;
925 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
926 get_nfs_open_context(l_ctx->open_context);
927 nfs_get_lock_context(l_ctx->open_context);
928 }
929 }
930
nfs3_nlm_unlock_prepare(struct rpc_task * task,void * data)931 static bool nfs3_nlm_unlock_prepare(struct rpc_task *task, void *data)
932 {
933 struct nfs_lock_context *l_ctx = data;
934 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags))
935 return nfs_async_iocounter_wait(task, l_ctx);
936 return false;
937
938 }
939
nfs3_nlm_release_call(void * data)940 static void nfs3_nlm_release_call(void *data)
941 {
942 struct nfs_lock_context *l_ctx = data;
943 struct nfs_open_context *ctx;
944 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
945 ctx = l_ctx->open_context;
946 nfs_put_lock_context(l_ctx);
947 put_nfs_open_context(ctx);
948 }
949 }
950
951 static const struct nlmclnt_operations nlmclnt_fl_close_lock_ops = {
952 .nlmclnt_alloc_call = nfs3_nlm_alloc_call,
953 .nlmclnt_unlock_prepare = nfs3_nlm_unlock_prepare,
954 .nlmclnt_release_call = nfs3_nlm_release_call,
955 };
956
957 static int
nfs3_proc_lock(struct file * filp,int cmd,struct file_lock * fl)958 nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
959 {
960 struct inode *inode = file_inode(filp);
961 struct nfs_lock_context *l_ctx = NULL;
962 struct nfs_open_context *ctx = nfs_file_open_context(filp);
963 int status;
964
965 if (fl->fl_flags & FL_CLOSE) {
966 l_ctx = nfs_get_lock_context(ctx);
967 if (IS_ERR(l_ctx))
968 l_ctx = NULL;
969 else
970 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
971 }
972
973 status = nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, l_ctx);
974
975 if (l_ctx)
976 nfs_put_lock_context(l_ctx);
977
978 return status;
979 }
980
nfs3_have_delegation(struct inode * inode,fmode_t flags)981 static int nfs3_have_delegation(struct inode *inode, fmode_t flags)
982 {
983 return 0;
984 }
985
986 static const struct inode_operations nfs3_dir_inode_operations = {
987 .create = nfs_create,
988 .lookup = nfs_lookup,
989 .link = nfs_link,
990 .unlink = nfs_unlink,
991 .symlink = nfs_symlink,
992 .mkdir = nfs_mkdir,
993 .rmdir = nfs_rmdir,
994 .mknod = nfs_mknod,
995 .rename = nfs_rename,
996 .permission = nfs_permission,
997 .getattr = nfs_getattr,
998 .setattr = nfs_setattr,
999 #ifdef CONFIG_NFS_V3_ACL
1000 .listxattr = nfs3_listxattr,
1001 .get_inode_acl = nfs3_get_acl,
1002 .set_acl = nfs3_set_acl,
1003 #endif
1004 };
1005
1006 static const struct inode_operations nfs3_file_inode_operations = {
1007 .permission = nfs_permission,
1008 .getattr = nfs_getattr,
1009 .setattr = nfs_setattr,
1010 #ifdef CONFIG_NFS_V3_ACL
1011 .listxattr = nfs3_listxattr,
1012 .get_inode_acl = nfs3_get_acl,
1013 .set_acl = nfs3_set_acl,
1014 #endif
1015 };
1016
1017 const struct nfs_rpc_ops nfs_v3_clientops = {
1018 .version = 3, /* protocol version */
1019 .dentry_ops = &nfs_dentry_operations,
1020 .dir_inode_ops = &nfs3_dir_inode_operations,
1021 .file_inode_ops = &nfs3_file_inode_operations,
1022 .file_ops = &nfs_file_operations,
1023 .nlmclnt_ops = &nlmclnt_fl_close_lock_ops,
1024 .getroot = nfs3_proc_get_root,
1025 .submount = nfs_submount,
1026 .try_get_tree = nfs_try_get_tree,
1027 .getattr = nfs3_proc_getattr,
1028 .setattr = nfs3_proc_setattr,
1029 .lookup = nfs3_proc_lookup,
1030 .lookupp = nfs3_proc_lookupp,
1031 .access = nfs3_proc_access,
1032 .readlink = nfs3_proc_readlink,
1033 .create = nfs3_proc_create,
1034 .remove = nfs3_proc_remove,
1035 .unlink_setup = nfs3_proc_unlink_setup,
1036 .unlink_rpc_prepare = nfs3_proc_unlink_rpc_prepare,
1037 .unlink_done = nfs3_proc_unlink_done,
1038 .rename_setup = nfs3_proc_rename_setup,
1039 .rename_rpc_prepare = nfs3_proc_rename_rpc_prepare,
1040 .rename_done = nfs3_proc_rename_done,
1041 .link = nfs3_proc_link,
1042 .symlink = nfs3_proc_symlink,
1043 .mkdir = nfs3_proc_mkdir,
1044 .rmdir = nfs3_proc_rmdir,
1045 .readdir = nfs3_proc_readdir,
1046 .mknod = nfs3_proc_mknod,
1047 .statfs = nfs3_proc_statfs,
1048 .fsinfo = nfs3_proc_fsinfo,
1049 .pathconf = nfs3_proc_pathconf,
1050 .decode_dirent = nfs3_decode_dirent,
1051 .pgio_rpc_prepare = nfs3_proc_pgio_rpc_prepare,
1052 .read_setup = nfs3_proc_read_setup,
1053 .read_done = nfs3_read_done,
1054 .write_setup = nfs3_proc_write_setup,
1055 .write_done = nfs3_write_done,
1056 .commit_setup = nfs3_proc_commit_setup,
1057 .commit_rpc_prepare = nfs3_proc_commit_rpc_prepare,
1058 .commit_done = nfs3_commit_done,
1059 .lock = nfs3_proc_lock,
1060 .clear_acl_cache = forget_all_cached_acls,
1061 .close_context = nfs_close_context,
1062 .have_delegation = nfs3_have_delegation,
1063 .alloc_client = nfs_alloc_client,
1064 .init_client = nfs_init_client,
1065 .free_client = nfs_free_client,
1066 .create_server = nfs3_create_server,
1067 .clone_server = nfs3_clone_server,
1068 };
1069