1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * This file contains vfs inode ops for the 9P2000.L protocol.
4 *
5 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
6 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
7 */
8
9 #include <linux/module.h>
10 #include <linux/errno.h>
11 #include <linux/fs.h>
12 #include <linux/file.h>
13 #include <linux/pagemap.h>
14 #include <linux/stat.h>
15 #include <linux/string.h>
16 #include <linux/namei.h>
17 #include <linux/sched.h>
18 #include <linux/slab.h>
19 #include <linux/xattr.h>
20 #include <linux/posix_acl.h>
21 #include <net/9p/9p.h>
22 #include <net/9p/client.h>
23
24 #include "v9fs.h"
25 #include "v9fs_vfs.h"
26 #include "fid.h"
27 #include "cache.h"
28 #include "xattr.h"
29 #include "acl.h"
30
31 static int
32 v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir,
33 struct dentry *dentry, umode_t omode, dev_t rdev);
34
35 /**
36 * v9fs_get_fsgid_for_create - Helper function to get the gid for a new object
37 * @dir_inode: The directory inode
38 *
39 * Helper function to get the gid for creating a
40 * new file system object. This checks the S_ISGID to determine the owning
41 * group of the new file system object.
42 */
43
v9fs_get_fsgid_for_create(struct inode * dir_inode)44 static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
45 {
46 BUG_ON(dir_inode == NULL);
47
48 if (dir_inode->i_mode & S_ISGID) {
49 /* set_gid bit is set.*/
50 return dir_inode->i_gid;
51 }
52 return current_fsgid();
53 }
54
v9fs_test_inode_dotl(struct inode * inode,void * data)55 static int v9fs_test_inode_dotl(struct inode *inode, void *data)
56 {
57 struct v9fs_inode *v9inode = V9FS_I(inode);
58 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
59
60 /* don't match inode of different type */
61 if (inode_wrong_type(inode, st->st_mode))
62 return 0;
63
64 if (inode->i_generation != st->st_gen)
65 return 0;
66
67 /* compare qid details */
68 if (memcmp(&v9inode->qid.version,
69 &st->qid.version, sizeof(v9inode->qid.version)))
70 return 0;
71
72 if (v9inode->qid.type != st->qid.type)
73 return 0;
74
75 if (v9inode->qid.path != st->qid.path)
76 return 0;
77 return 1;
78 }
79
80 /* Always get a new inode */
v9fs_test_new_inode_dotl(struct inode * inode,void * data)81 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
82 {
83 return 0;
84 }
85
v9fs_set_inode_dotl(struct inode * inode,void * data)86 static int v9fs_set_inode_dotl(struct inode *inode, void *data)
87 {
88 struct v9fs_inode *v9inode = V9FS_I(inode);
89 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
90
91 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
92 inode->i_generation = st->st_gen;
93 return 0;
94 }
95
v9fs_qid_iget_dotl(struct super_block * sb,struct p9_qid * qid,struct p9_fid * fid,struct p9_stat_dotl * st,int new)96 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
97 struct p9_qid *qid,
98 struct p9_fid *fid,
99 struct p9_stat_dotl *st,
100 int new)
101 {
102 int retval;
103 unsigned long i_ino;
104 struct inode *inode;
105 struct v9fs_session_info *v9ses = sb->s_fs_info;
106 int (*test)(struct inode *inode, void *data);
107
108 if (new)
109 test = v9fs_test_new_inode_dotl;
110 else
111 test = v9fs_test_inode_dotl;
112
113 i_ino = v9fs_qid2ino(qid);
114 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
115 if (!inode)
116 return ERR_PTR(-ENOMEM);
117 if (!(inode->i_state & I_NEW))
118 return inode;
119 /*
120 * initialize the inode with the stat info
121 * FIXME!! we may need support for stale inodes
122 * later.
123 */
124 inode->i_ino = i_ino;
125 retval = v9fs_init_inode(v9ses, inode,
126 st->st_mode, new_decode_dev(st->st_rdev));
127 if (retval)
128 goto error;
129
130 v9fs_stat2inode_dotl(st, inode, 0);
131 v9fs_set_netfs_context(inode);
132 v9fs_cache_inode_get_cookie(inode);
133 retval = v9fs_get_acl(inode, fid);
134 if (retval)
135 goto error;
136
137 unlock_new_inode(inode);
138 return inode;
139 error:
140 iget_failed(inode);
141 return ERR_PTR(retval);
142
143 }
144
145 struct inode *
v9fs_inode_from_fid_dotl(struct v9fs_session_info * v9ses,struct p9_fid * fid,struct super_block * sb,int new)146 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
147 struct super_block *sb, int new)
148 {
149 struct p9_stat_dotl *st;
150 struct inode *inode = NULL;
151
152 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
153 if (IS_ERR(st))
154 return ERR_CAST(st);
155
156 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
157 kfree(st);
158 return inode;
159 }
160
161 struct dotl_openflag_map {
162 int open_flag;
163 int dotl_flag;
164 };
165
v9fs_mapped_dotl_flags(int flags)166 static int v9fs_mapped_dotl_flags(int flags)
167 {
168 int i;
169 int rflags = 0;
170 struct dotl_openflag_map dotl_oflag_map[] = {
171 { O_CREAT, P9_DOTL_CREATE },
172 { O_EXCL, P9_DOTL_EXCL },
173 { O_NOCTTY, P9_DOTL_NOCTTY },
174 { O_APPEND, P9_DOTL_APPEND },
175 { O_NONBLOCK, P9_DOTL_NONBLOCK },
176 { O_DSYNC, P9_DOTL_DSYNC },
177 { FASYNC, P9_DOTL_FASYNC },
178 { O_DIRECT, P9_DOTL_DIRECT },
179 { O_LARGEFILE, P9_DOTL_LARGEFILE },
180 { O_DIRECTORY, P9_DOTL_DIRECTORY },
181 { O_NOFOLLOW, P9_DOTL_NOFOLLOW },
182 { O_NOATIME, P9_DOTL_NOATIME },
183 { O_CLOEXEC, P9_DOTL_CLOEXEC },
184 { O_SYNC, P9_DOTL_SYNC},
185 };
186 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
187 if (flags & dotl_oflag_map[i].open_flag)
188 rflags |= dotl_oflag_map[i].dotl_flag;
189 }
190 return rflags;
191 }
192
193 /**
194 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
195 * plan 9 open flag.
196 * @flags: flags to convert
197 */
v9fs_open_to_dotl_flags(int flags)198 int v9fs_open_to_dotl_flags(int flags)
199 {
200 int rflags = 0;
201
202 /*
203 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
204 * and P9_DOTL_NOACCESS
205 */
206 rflags |= flags & O_ACCMODE;
207 rflags |= v9fs_mapped_dotl_flags(flags);
208
209 return rflags;
210 }
211
212 /**
213 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
214 * @idmap: The user namespace of the mount
215 * @dir: directory inode that is being created
216 * @dentry: dentry that is being deleted
217 * @omode: create permissions
218 * @excl: True if the file must not yet exist
219 *
220 */
221 static int
v9fs_vfs_create_dotl(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t omode,bool excl)222 v9fs_vfs_create_dotl(struct mnt_idmap *idmap, struct inode *dir,
223 struct dentry *dentry, umode_t omode, bool excl)
224 {
225 return v9fs_vfs_mknod_dotl(idmap, dir, dentry, omode, 0);
226 }
227
228 static int
v9fs_vfs_atomic_open_dotl(struct inode * dir,struct dentry * dentry,struct file * file,unsigned int flags,umode_t omode)229 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
230 struct file *file, unsigned int flags, umode_t omode)
231 {
232 int err = 0;
233 kgid_t gid;
234 umode_t mode;
235 int p9_omode = v9fs_open_to_dotl_flags(flags);
236 const unsigned char *name = NULL;
237 struct p9_qid qid;
238 struct inode *inode;
239 struct p9_fid *fid = NULL;
240 struct p9_fid *dfid = NULL, *ofid = NULL;
241 struct v9fs_session_info *v9ses;
242 struct posix_acl *pacl = NULL, *dacl = NULL;
243 struct dentry *res = NULL;
244
245 if (d_in_lookup(dentry)) {
246 res = v9fs_vfs_lookup(dir, dentry, 0);
247 if (IS_ERR(res))
248 return PTR_ERR(res);
249
250 if (res)
251 dentry = res;
252 }
253
254 /* Only creates */
255 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
256 return finish_no_open(file, res);
257
258 v9ses = v9fs_inode2v9ses(dir);
259
260 name = dentry->d_name.name;
261 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%x\n",
262 name, flags, omode);
263
264 dfid = v9fs_parent_fid(dentry);
265 if (IS_ERR(dfid)) {
266 err = PTR_ERR(dfid);
267 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
268 goto out;
269 }
270
271 /* clone a fid to use for creation */
272 ofid = clone_fid(dfid);
273 if (IS_ERR(ofid)) {
274 err = PTR_ERR(ofid);
275 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
276 goto out;
277 }
278
279 gid = v9fs_get_fsgid_for_create(dir);
280
281 mode = omode;
282 /* Update mode based on ACL value */
283 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
284 if (err) {
285 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in create %d\n",
286 err);
287 goto out;
288 }
289
290 if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) {
291 p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR;
292 p9_debug(P9_DEBUG_CACHE,
293 "write-only file with writeback enabled, creating w/ O_RDWR\n");
294 }
295 err = p9_client_create_dotl(ofid, name, p9_omode, mode, gid, &qid);
296 if (err < 0) {
297 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in create %d\n",
298 err);
299 goto out;
300 }
301 v9fs_invalidate_inode_attr(dir);
302
303 /* instantiate inode and assign the unopened fid to the dentry */
304 fid = p9_client_walk(dfid, 1, &name, 1);
305 if (IS_ERR(fid)) {
306 err = PTR_ERR(fid);
307 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
308 goto out;
309 }
310 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
311 if (IS_ERR(inode)) {
312 err = PTR_ERR(inode);
313 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
314 goto out;
315 }
316 /* Now set the ACL based on the default value */
317 v9fs_set_create_acl(inode, fid, dacl, pacl);
318
319 v9fs_fid_add(dentry, &fid);
320 d_instantiate(dentry, inode);
321
322 /* Since we are opening a file, assign the open fid to the file */
323 err = finish_open(file, dentry, generic_file_open);
324 if (err)
325 goto out;
326 file->private_data = ofid;
327 #ifdef CONFIG_9P_FSCACHE
328 if (v9ses->cache & CACHE_FSCACHE) {
329 struct v9fs_inode *v9inode = V9FS_I(inode);
330 fscache_use_cookie(v9fs_inode_cookie(v9inode),
331 file->f_mode & FMODE_WRITE);
332 }
333 #endif
334 v9fs_fid_add_modes(ofid, v9ses->flags, v9ses->cache, flags);
335 v9fs_open_fid_add(inode, &ofid);
336 file->f_mode |= FMODE_CREATED;
337 out:
338 p9_fid_put(dfid);
339 p9_fid_put(ofid);
340 p9_fid_put(fid);
341 v9fs_put_acl(dacl, pacl);
342 dput(res);
343 return err;
344 }
345
346 /**
347 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
348 * @idmap: The idmap of the mount
349 * @dir: inode that is being unlinked
350 * @dentry: dentry that is being unlinked
351 * @omode: mode for new directory
352 *
353 */
354
v9fs_vfs_mkdir_dotl(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t omode)355 static int v9fs_vfs_mkdir_dotl(struct mnt_idmap *idmap,
356 struct inode *dir, struct dentry *dentry,
357 umode_t omode)
358 {
359 int err;
360 struct v9fs_session_info *v9ses;
361 struct p9_fid *fid = NULL, *dfid = NULL;
362 kgid_t gid;
363 const unsigned char *name;
364 umode_t mode;
365 struct inode *inode;
366 struct p9_qid qid;
367 struct posix_acl *dacl = NULL, *pacl = NULL;
368
369 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
370 v9ses = v9fs_inode2v9ses(dir);
371
372 omode |= S_IFDIR;
373 if (dir->i_mode & S_ISGID)
374 omode |= S_ISGID;
375
376 dfid = v9fs_parent_fid(dentry);
377 if (IS_ERR(dfid)) {
378 err = PTR_ERR(dfid);
379 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
380 goto error;
381 }
382
383 gid = v9fs_get_fsgid_for_create(dir);
384 mode = omode;
385 /* Update mode based on ACL value */
386 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
387 if (err) {
388 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
389 err);
390 goto error;
391 }
392 name = dentry->d_name.name;
393 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
394 if (err < 0)
395 goto error;
396 fid = p9_client_walk(dfid, 1, &name, 1);
397 if (IS_ERR(fid)) {
398 err = PTR_ERR(fid);
399 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
400 err);
401 goto error;
402 }
403
404 /* instantiate inode and assign the unopened fid to the dentry */
405 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
406 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
407 if (IS_ERR(inode)) {
408 err = PTR_ERR(inode);
409 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
410 err);
411 goto error;
412 }
413 v9fs_fid_add(dentry, &fid);
414 v9fs_set_create_acl(inode, fid, dacl, pacl);
415 d_instantiate(dentry, inode);
416 err = 0;
417 } else {
418 /*
419 * Not in cached mode. No need to populate
420 * inode with stat. We need to get an inode
421 * so that we can set the acl with dentry
422 */
423 inode = v9fs_get_inode(dir->i_sb, mode, 0);
424 if (IS_ERR(inode)) {
425 err = PTR_ERR(inode);
426 goto error;
427 }
428 v9fs_set_create_acl(inode, fid, dacl, pacl);
429 d_instantiate(dentry, inode);
430 }
431 inc_nlink(dir);
432 v9fs_invalidate_inode_attr(dir);
433 error:
434 p9_fid_put(fid);
435 v9fs_put_acl(dacl, pacl);
436 p9_fid_put(dfid);
437 return err;
438 }
439
440 static int
v9fs_vfs_getattr_dotl(struct mnt_idmap * idmap,const struct path * path,struct kstat * stat,u32 request_mask,unsigned int flags)441 v9fs_vfs_getattr_dotl(struct mnt_idmap *idmap,
442 const struct path *path, struct kstat *stat,
443 u32 request_mask, unsigned int flags)
444 {
445 struct dentry *dentry = path->dentry;
446 struct v9fs_session_info *v9ses;
447 struct p9_fid *fid;
448 struct inode *inode = d_inode(dentry);
449 struct p9_stat_dotl *st;
450
451 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
452 v9ses = v9fs_dentry2v9ses(dentry);
453 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
454 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
455 return 0;
456 } else if (v9ses->cache) {
457 if (S_ISREG(inode->i_mode)) {
458 int retval = filemap_fdatawrite(inode->i_mapping);
459
460 if (retval)
461 p9_debug(P9_DEBUG_ERROR,
462 "flushing writeback during getattr returned %d\n", retval);
463 }
464 }
465 fid = v9fs_fid_lookup(dentry);
466 if (IS_ERR(fid))
467 return PTR_ERR(fid);
468
469 /* Ask for all the fields in stat structure. Server will return
470 * whatever it supports
471 */
472
473 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
474 p9_fid_put(fid);
475 if (IS_ERR(st))
476 return PTR_ERR(st);
477
478 v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
479 generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat);
480 /* Change block size to what the server returned */
481 stat->blksize = st->st_blksize;
482
483 kfree(st);
484 return 0;
485 }
486
487 /*
488 * Attribute flags.
489 */
490 #define P9_ATTR_MODE (1 << 0)
491 #define P9_ATTR_UID (1 << 1)
492 #define P9_ATTR_GID (1 << 2)
493 #define P9_ATTR_SIZE (1 << 3)
494 #define P9_ATTR_ATIME (1 << 4)
495 #define P9_ATTR_MTIME (1 << 5)
496 #define P9_ATTR_CTIME (1 << 6)
497 #define P9_ATTR_ATIME_SET (1 << 7)
498 #define P9_ATTR_MTIME_SET (1 << 8)
499
500 struct dotl_iattr_map {
501 int iattr_valid;
502 int p9_iattr_valid;
503 };
504
v9fs_mapped_iattr_valid(int iattr_valid)505 static int v9fs_mapped_iattr_valid(int iattr_valid)
506 {
507 int i;
508 int p9_iattr_valid = 0;
509 struct dotl_iattr_map dotl_iattr_map[] = {
510 { ATTR_MODE, P9_ATTR_MODE },
511 { ATTR_UID, P9_ATTR_UID },
512 { ATTR_GID, P9_ATTR_GID },
513 { ATTR_SIZE, P9_ATTR_SIZE },
514 { ATTR_ATIME, P9_ATTR_ATIME },
515 { ATTR_MTIME, P9_ATTR_MTIME },
516 { ATTR_CTIME, P9_ATTR_CTIME },
517 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET },
518 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET },
519 };
520 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
521 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
522 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
523 }
524 return p9_iattr_valid;
525 }
526
527 /**
528 * v9fs_vfs_setattr_dotl - set file metadata
529 * @idmap: idmap of the mount
530 * @dentry: file whose metadata to set
531 * @iattr: metadata assignment structure
532 *
533 */
534
v9fs_vfs_setattr_dotl(struct mnt_idmap * idmap,struct dentry * dentry,struct iattr * iattr)535 int v9fs_vfs_setattr_dotl(struct mnt_idmap *idmap,
536 struct dentry *dentry, struct iattr *iattr)
537 {
538 int retval, use_dentry = 0;
539 struct inode *inode = d_inode(dentry);
540 struct v9fs_session_info __maybe_unused *v9ses;
541 struct p9_fid *fid = NULL;
542 struct p9_iattr_dotl p9attr = {
543 .uid = INVALID_UID,
544 .gid = INVALID_GID,
545 };
546
547 p9_debug(P9_DEBUG_VFS, "\n");
548
549 retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
550 if (retval)
551 return retval;
552
553 v9ses = v9fs_dentry2v9ses(dentry);
554
555 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
556 if (iattr->ia_valid & ATTR_MODE)
557 p9attr.mode = iattr->ia_mode;
558 if (iattr->ia_valid & ATTR_UID)
559 p9attr.uid = iattr->ia_uid;
560 if (iattr->ia_valid & ATTR_GID)
561 p9attr.gid = iattr->ia_gid;
562 if (iattr->ia_valid & ATTR_SIZE)
563 p9attr.size = iattr->ia_size;
564 if (iattr->ia_valid & ATTR_ATIME_SET) {
565 p9attr.atime_sec = iattr->ia_atime.tv_sec;
566 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
567 }
568 if (iattr->ia_valid & ATTR_MTIME_SET) {
569 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
570 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
571 }
572
573 if (iattr->ia_valid & ATTR_FILE) {
574 fid = iattr->ia_file->private_data;
575 WARN_ON(!fid);
576 }
577 if (!fid) {
578 fid = v9fs_fid_lookup(dentry);
579 use_dentry = 1;
580 }
581 if (IS_ERR(fid))
582 return PTR_ERR(fid);
583
584 /* Write all dirty data */
585 if (S_ISREG(inode->i_mode)) {
586 retval = filemap_fdatawrite(inode->i_mapping);
587 if (retval < 0)
588 p9_debug(P9_DEBUG_ERROR,
589 "Flushing file prior to setattr failed: %d\n", retval);
590 }
591
592 retval = p9_client_setattr(fid, &p9attr);
593 if (retval < 0) {
594 if (use_dentry)
595 p9_fid_put(fid);
596 return retval;
597 }
598
599 if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size !=
600 i_size_read(inode)) {
601 truncate_setsize(inode, iattr->ia_size);
602 truncate_pagecache(inode, iattr->ia_size);
603
604 #ifdef CONFIG_9P_FSCACHE
605 if (v9ses->cache & CACHE_FSCACHE)
606 fscache_resize_cookie(v9fs_inode_cookie(V9FS_I(inode)),
607 iattr->ia_size);
608 #endif
609 }
610
611 v9fs_invalidate_inode_attr(inode);
612 setattr_copy(&nop_mnt_idmap, inode, iattr);
613 mark_inode_dirty(inode);
614 if (iattr->ia_valid & ATTR_MODE) {
615 /* We also want to update ACL when we update mode bits */
616 retval = v9fs_acl_chmod(inode, fid);
617 if (retval < 0) {
618 if (use_dentry)
619 p9_fid_put(fid);
620 return retval;
621 }
622 }
623 if (use_dentry)
624 p9_fid_put(fid);
625
626 return 0;
627 }
628
629 /**
630 * v9fs_stat2inode_dotl - populate an inode structure with stat info
631 * @stat: stat structure
632 * @inode: inode to populate
633 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
634 *
635 */
636
637 void
v9fs_stat2inode_dotl(struct p9_stat_dotl * stat,struct inode * inode,unsigned int flags)638 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
639 unsigned int flags)
640 {
641 umode_t mode;
642 struct v9fs_inode *v9inode = V9FS_I(inode);
643
644 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
645 inode->i_atime.tv_sec = stat->st_atime_sec;
646 inode->i_atime.tv_nsec = stat->st_atime_nsec;
647 inode->i_mtime.tv_sec = stat->st_mtime_sec;
648 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
649 inode_set_ctime(inode, stat->st_ctime_sec,
650 stat->st_ctime_nsec);
651 inode->i_uid = stat->st_uid;
652 inode->i_gid = stat->st_gid;
653 set_nlink(inode, stat->st_nlink);
654
655 mode = stat->st_mode & S_IALLUGO;
656 mode |= inode->i_mode & ~S_IALLUGO;
657 inode->i_mode = mode;
658
659 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
660 v9fs_i_size_write(inode, stat->st_size);
661 inode->i_blocks = stat->st_blocks;
662 } else {
663 if (stat->st_result_mask & P9_STATS_ATIME) {
664 inode->i_atime.tv_sec = stat->st_atime_sec;
665 inode->i_atime.tv_nsec = stat->st_atime_nsec;
666 }
667 if (stat->st_result_mask & P9_STATS_MTIME) {
668 inode->i_mtime.tv_sec = stat->st_mtime_sec;
669 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
670 }
671 if (stat->st_result_mask & P9_STATS_CTIME) {
672 inode_set_ctime(inode, stat->st_ctime_sec,
673 stat->st_ctime_nsec);
674 }
675 if (stat->st_result_mask & P9_STATS_UID)
676 inode->i_uid = stat->st_uid;
677 if (stat->st_result_mask & P9_STATS_GID)
678 inode->i_gid = stat->st_gid;
679 if (stat->st_result_mask & P9_STATS_NLINK)
680 set_nlink(inode, stat->st_nlink);
681 if (stat->st_result_mask & P9_STATS_MODE) {
682 mode = stat->st_mode & S_IALLUGO;
683 mode |= inode->i_mode & ~S_IALLUGO;
684 inode->i_mode = mode;
685 }
686 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
687 stat->st_result_mask & P9_STATS_SIZE)
688 v9fs_i_size_write(inode, stat->st_size);
689 if (stat->st_result_mask & P9_STATS_BLOCKS)
690 inode->i_blocks = stat->st_blocks;
691 }
692 if (stat->st_result_mask & P9_STATS_GEN)
693 inode->i_generation = stat->st_gen;
694
695 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
696 * because the inode structure does not have fields for them.
697 */
698 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
699 }
700
701 static int
v9fs_vfs_symlink_dotl(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,const char * symname)702 v9fs_vfs_symlink_dotl(struct mnt_idmap *idmap, struct inode *dir,
703 struct dentry *dentry, const char *symname)
704 {
705 int err;
706 kgid_t gid;
707 const unsigned char *name;
708 struct p9_qid qid;
709 struct inode *inode;
710 struct p9_fid *dfid;
711 struct p9_fid *fid = NULL;
712 struct v9fs_session_info *v9ses;
713
714 name = dentry->d_name.name;
715 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
716 v9ses = v9fs_inode2v9ses(dir);
717
718 dfid = v9fs_parent_fid(dentry);
719 if (IS_ERR(dfid)) {
720 err = PTR_ERR(dfid);
721 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
722 return err;
723 }
724
725 gid = v9fs_get_fsgid_for_create(dir);
726
727 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
728 err = p9_client_symlink(dfid, name, symname, gid, &qid);
729
730 if (err < 0) {
731 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
732 goto error;
733 }
734
735 v9fs_invalidate_inode_attr(dir);
736 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
737 /* Now walk from the parent so we can get an unopened fid. */
738 fid = p9_client_walk(dfid, 1, &name, 1);
739 if (IS_ERR(fid)) {
740 err = PTR_ERR(fid);
741 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
742 err);
743 goto error;
744 }
745
746 /* instantiate inode and assign the unopened fid to dentry */
747 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
748 if (IS_ERR(inode)) {
749 err = PTR_ERR(inode);
750 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
751 err);
752 goto error;
753 }
754 v9fs_fid_add(dentry, &fid);
755 d_instantiate(dentry, inode);
756 err = 0;
757 } else {
758 /* Not in cached mode. No need to populate inode with stat */
759 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
760 if (IS_ERR(inode)) {
761 err = PTR_ERR(inode);
762 goto error;
763 }
764 d_instantiate(dentry, inode);
765 }
766
767 error:
768 p9_fid_put(fid);
769 p9_fid_put(dfid);
770 return err;
771 }
772
773 /**
774 * v9fs_vfs_link_dotl - create a hardlink for dotl
775 * @old_dentry: dentry for file to link to
776 * @dir: inode destination for new link
777 * @dentry: dentry for link
778 *
779 */
780
781 static int
v9fs_vfs_link_dotl(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)782 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
783 struct dentry *dentry)
784 {
785 int err;
786 struct p9_fid *dfid, *oldfid;
787 struct v9fs_session_info *v9ses;
788
789 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
790 dir->i_ino, old_dentry, dentry);
791
792 v9ses = v9fs_inode2v9ses(dir);
793 dfid = v9fs_parent_fid(dentry);
794 if (IS_ERR(dfid))
795 return PTR_ERR(dfid);
796
797 oldfid = v9fs_fid_lookup(old_dentry);
798 if (IS_ERR(oldfid)) {
799 p9_fid_put(dfid);
800 return PTR_ERR(oldfid);
801 }
802
803 err = p9_client_link(dfid, oldfid, dentry->d_name.name);
804
805 p9_fid_put(dfid);
806 p9_fid_put(oldfid);
807 if (err < 0) {
808 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
809 return err;
810 }
811
812 v9fs_invalidate_inode_attr(dir);
813 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
814 /* Get the latest stat info from server. */
815 struct p9_fid *fid;
816
817 fid = v9fs_fid_lookup(old_dentry);
818 if (IS_ERR(fid))
819 return PTR_ERR(fid);
820
821 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
822 p9_fid_put(fid);
823 }
824 ihold(d_inode(old_dentry));
825 d_instantiate(dentry, d_inode(old_dentry));
826
827 return err;
828 }
829
830 /**
831 * v9fs_vfs_mknod_dotl - create a special file
832 * @idmap: The idmap of the mount
833 * @dir: inode destination for new link
834 * @dentry: dentry for file
835 * @omode: mode for creation
836 * @rdev: device associated with special file
837 *
838 */
839 static int
v9fs_vfs_mknod_dotl(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t omode,dev_t rdev)840 v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir,
841 struct dentry *dentry, umode_t omode, dev_t rdev)
842 {
843 int err;
844 kgid_t gid;
845 const unsigned char *name;
846 umode_t mode;
847 struct v9fs_session_info *v9ses;
848 struct p9_fid *fid = NULL, *dfid = NULL;
849 struct inode *inode;
850 struct p9_qid qid;
851 struct posix_acl *dacl = NULL, *pacl = NULL;
852
853 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
854 dir->i_ino, dentry, omode,
855 MAJOR(rdev), MINOR(rdev));
856
857 v9ses = v9fs_inode2v9ses(dir);
858 dfid = v9fs_parent_fid(dentry);
859 if (IS_ERR(dfid)) {
860 err = PTR_ERR(dfid);
861 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
862 goto error;
863 }
864
865 gid = v9fs_get_fsgid_for_create(dir);
866 mode = omode;
867 /* Update mode based on ACL value */
868 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
869 if (err) {
870 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
871 err);
872 goto error;
873 }
874 name = dentry->d_name.name;
875
876 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
877 if (err < 0)
878 goto error;
879
880 v9fs_invalidate_inode_attr(dir);
881 fid = p9_client_walk(dfid, 1, &name, 1);
882 if (IS_ERR(fid)) {
883 err = PTR_ERR(fid);
884 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
885 err);
886 goto error;
887 }
888
889 /* instantiate inode and assign the unopened fid to the dentry */
890 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
891 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
892 if (IS_ERR(inode)) {
893 err = PTR_ERR(inode);
894 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
895 err);
896 goto error;
897 }
898 v9fs_set_create_acl(inode, fid, dacl, pacl);
899 v9fs_fid_add(dentry, &fid);
900 d_instantiate(dentry, inode);
901 err = 0;
902 } else {
903 /*
904 * Not in cached mode. No need to populate inode with stat.
905 * socket syscall returns a fd, so we need instantiate
906 */
907 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
908 if (IS_ERR(inode)) {
909 err = PTR_ERR(inode);
910 goto error;
911 }
912 v9fs_set_create_acl(inode, fid, dacl, pacl);
913 d_instantiate(dentry, inode);
914 }
915 error:
916 p9_fid_put(fid);
917 v9fs_put_acl(dacl, pacl);
918 p9_fid_put(dfid);
919
920 return err;
921 }
922
923 /**
924 * v9fs_vfs_get_link_dotl - follow a symlink path
925 * @dentry: dentry for symlink
926 * @inode: inode for symlink
927 * @done: destructor for return value
928 */
929
930 static const char *
v9fs_vfs_get_link_dotl(struct dentry * dentry,struct inode * inode,struct delayed_call * done)931 v9fs_vfs_get_link_dotl(struct dentry *dentry,
932 struct inode *inode,
933 struct delayed_call *done)
934 {
935 struct p9_fid *fid;
936 char *target;
937 int retval;
938
939 if (!dentry)
940 return ERR_PTR(-ECHILD);
941
942 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
943
944 fid = v9fs_fid_lookup(dentry);
945 if (IS_ERR(fid))
946 return ERR_CAST(fid);
947 retval = p9_client_readlink(fid, &target);
948 p9_fid_put(fid);
949 if (retval)
950 return ERR_PTR(retval);
951 set_delayed_call(done, kfree_link, target);
952 return target;
953 }
954
v9fs_refresh_inode_dotl(struct p9_fid * fid,struct inode * inode)955 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
956 {
957 struct p9_stat_dotl *st;
958 struct v9fs_session_info *v9ses;
959 unsigned int flags;
960
961 v9ses = v9fs_inode2v9ses(inode);
962 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
963 if (IS_ERR(st))
964 return PTR_ERR(st);
965 /*
966 * Don't update inode if the file type is different
967 */
968 if (inode_wrong_type(inode, st->st_mode))
969 goto out;
970
971 /*
972 * We don't want to refresh inode->i_size,
973 * because we may have cached data
974 */
975 flags = (v9ses->cache & CACHE_LOOSE) ?
976 V9FS_STAT2INODE_KEEP_ISIZE : 0;
977 v9fs_stat2inode_dotl(st, inode, flags);
978 out:
979 kfree(st);
980 return 0;
981 }
982
983 const struct inode_operations v9fs_dir_inode_operations_dotl = {
984 .create = v9fs_vfs_create_dotl,
985 .atomic_open = v9fs_vfs_atomic_open_dotl,
986 .lookup = v9fs_vfs_lookup,
987 .link = v9fs_vfs_link_dotl,
988 .symlink = v9fs_vfs_symlink_dotl,
989 .unlink = v9fs_vfs_unlink,
990 .mkdir = v9fs_vfs_mkdir_dotl,
991 .rmdir = v9fs_vfs_rmdir,
992 .mknod = v9fs_vfs_mknod_dotl,
993 .rename = v9fs_vfs_rename,
994 .getattr = v9fs_vfs_getattr_dotl,
995 .setattr = v9fs_vfs_setattr_dotl,
996 .listxattr = v9fs_listxattr,
997 .get_inode_acl = v9fs_iop_get_inode_acl,
998 .get_acl = v9fs_iop_get_acl,
999 .set_acl = v9fs_iop_set_acl,
1000 };
1001
1002 const struct inode_operations v9fs_file_inode_operations_dotl = {
1003 .getattr = v9fs_vfs_getattr_dotl,
1004 .setattr = v9fs_vfs_setattr_dotl,
1005 .listxattr = v9fs_listxattr,
1006 .get_inode_acl = v9fs_iop_get_inode_acl,
1007 .get_acl = v9fs_iop_get_acl,
1008 .set_acl = v9fs_iop_set_acl,
1009 };
1010
1011 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
1012 .get_link = v9fs_vfs_get_link_dotl,
1013 .getattr = v9fs_vfs_getattr_dotl,
1014 .setattr = v9fs_vfs_setattr_dotl,
1015 .listxattr = v9fs_listxattr,
1016 };
1017