1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * This file contains vfs inode ops for the 9P2000 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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <linux/module.h>
12#include <linux/errno.h>
13#include <linux/fs.h>
14#include <linux/file.h>
15#include <linux/pagemap.h>
16#include <linux/stat.h>
17#include <linux/string.h>
18#include <linux/namei.h>
19#include <linux/sched.h>
20#include <linux/slab.h>
21#include <linux/xattr.h>
22#include <linux/posix_acl.h>
23#include <net/9p/9p.h>
24#include <net/9p/client.h>
25
26#include "v9fs.h"
27#include "v9fs_vfs.h"
28#include "fid.h"
29#include "cache.h"
30#include "xattr.h"
31#include "acl.h"
32
33static const struct inode_operations v9fs_dir_inode_operations;
34static const struct inode_operations v9fs_dir_inode_operations_dotu;
35static const struct inode_operations v9fs_file_inode_operations;
36static const struct inode_operations v9fs_symlink_inode_operations;
37
38/**
39 * unixmode2p9mode - convert unix mode bits to plan 9
40 * @v9ses: v9fs session information
41 * @mode: mode to convert
42 *
43 */
44
45static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode)
46{
47 int res;
48
49 res = mode & 0777;
50 if (S_ISDIR(mode))
51 res |= P9_DMDIR;
52 if (v9fs_proto_dotu(v9ses)) {
53 if (v9ses->nodev == 0) {
54 if (S_ISSOCK(mode))
55 res |= P9_DMSOCKET;
56 if (S_ISFIFO(mode))
57 res |= P9_DMNAMEDPIPE;
58 if (S_ISBLK(mode))
59 res |= P9_DMDEVICE;
60 if (S_ISCHR(mode))
61 res |= P9_DMDEVICE;
62 }
63
64 if ((mode & S_ISUID) == S_ISUID)
65 res |= P9_DMSETUID;
66 if ((mode & S_ISGID) == S_ISGID)
67 res |= P9_DMSETGID;
68 if ((mode & S_ISVTX) == S_ISVTX)
69 res |= P9_DMSETVTX;
70 }
71 return res;
72}
73
74/**
75 * p9mode2perm- convert plan9 mode bits to unix permission bits
76 * @v9ses: v9fs session information
77 * @stat: p9_wstat from which mode need to be derived
78 *
79 */
80static int p9mode2perm(struct v9fs_session_info *v9ses,
81 struct p9_wstat *stat)
82{
83 int res;
84 int mode = stat->mode;
85
86 res = mode & 0777; /* S_IRWXUGO */
87 if (v9fs_proto_dotu(v9ses)) {
88 if ((mode & P9_DMSETUID) == P9_DMSETUID)
89 res |= S_ISUID;
90
91 if ((mode & P9_DMSETGID) == P9_DMSETGID)
92 res |= S_ISGID;
93
94 if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
95 res |= S_ISVTX;
96 }
97 return res;
98}
99
100/**
101 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
102 * @v9ses: v9fs session information
103 * @stat: p9_wstat from which mode need to be derived
104 * @rdev: major number, minor number in case of device files.
105 *
106 */
107static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses,
108 struct p9_wstat *stat, dev_t *rdev)
109{
110 int res, r;
111 u32 mode = stat->mode;
112
113 *rdev = 0;
114 res = p9mode2perm(v9ses, stat);
115
116 if ((mode & P9_DMDIR) == P9_DMDIR)
117 res |= S_IFDIR;
118 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
119 res |= S_IFLNK;
120 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
121 && (v9ses->nodev == 0))
122 res |= S_IFSOCK;
123 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
124 && (v9ses->nodev == 0))
125 res |= S_IFIFO;
126 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
127 && (v9ses->nodev == 0)) {
128 char type = 0;
129 int major = -1, minor = -1;
130
131 r = sscanf(stat->extension, "%c %i %i", &type, &major, &minor);
132 if (r != 3) {
133 p9_debug(P9_DEBUG_ERROR,
134 "invalid device string, umode will be bogus: %s\n",
135 stat->extension);
136 return res;
137 }
138 switch (type) {
139 case 'c':
140 res |= S_IFCHR;
141 break;
142 case 'b':
143 res |= S_IFBLK;
144 break;
145 default:
146 p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n",
147 type, stat->extension);
148 }
149 *rdev = MKDEV(major, minor);
150 } else
151 res |= S_IFREG;
152
153 return res;
154}
155
156/**
157 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
158 * @uflags: flags to convert
159 * @extended: if .u extensions are active
160 */
161
162int v9fs_uflags2omode(int uflags, int extended)
163{
164 int ret;
165
166 switch (uflags&3) {
167 default:
168 case O_RDONLY:
169 ret = P9_OREAD;
170 break;
171
172 case O_WRONLY:
173 ret = P9_OWRITE;
174 break;
175
176 case O_RDWR:
177 ret = P9_ORDWR;
178 break;
179 }
180
181 if (uflags & O_TRUNC)
182 ret |= P9_OTRUNC;
183
184 if (extended) {
185 if (uflags & O_EXCL)
186 ret |= P9_OEXCL;
187
188 if (uflags & O_APPEND)
189 ret |= P9_OAPPEND;
190 }
191
192 return ret;
193}
194
195/**
196 * v9fs_blank_wstat - helper function to setup a 9P stat structure
197 * @wstat: structure to initialize
198 *
199 */
200
201void
202v9fs_blank_wstat(struct p9_wstat *wstat)
203{
204 wstat->type = ~0;
205 wstat->dev = ~0;
206 wstat->qid.type = ~0;
207 wstat->qid.version = ~0;
208 *((long long *)&wstat->qid.path) = ~0;
209 wstat->mode = ~0;
210 wstat->atime = ~0;
211 wstat->mtime = ~0;
212 wstat->length = ~0;
213 wstat->name = NULL;
214 wstat->uid = NULL;
215 wstat->gid = NULL;
216 wstat->muid = NULL;
217 wstat->n_uid = INVALID_UID;
218 wstat->n_gid = INVALID_GID;
219 wstat->n_muid = INVALID_UID;
220 wstat->extension = NULL;
221}
222
223/**
224 * v9fs_alloc_inode - helper function to allocate an inode
225 * @sb: The superblock to allocate the inode from
226 */
227struct inode *v9fs_alloc_inode(struct super_block *sb)
228{
229 struct v9fs_inode *v9inode;
230
231 v9inode = alloc_inode_sb(sb, v9fs_inode_cache, GFP_KERNEL);
232 if (!v9inode)
233 return NULL;
234 v9inode->cache_validity = 0;
235 mutex_init(&v9inode->v_mutex);
236 return &v9inode->netfs.inode;
237}
238
239/**
240 * v9fs_free_inode - destroy an inode
241 * @inode: The inode to be freed
242 */
243
244void v9fs_free_inode(struct inode *inode)
245{
246 kmem_cache_free(s: v9fs_inode_cache, objp: V9FS_I(inode));
247}
248
249/*
250 * Set parameters for the netfs library
251 */
252void v9fs_set_netfs_context(struct inode *inode)
253{
254 struct v9fs_inode *v9inode = V9FS_I(inode);
255 netfs_inode_init(ctx: &v9inode->netfs, ops: &v9fs_req_ops, use_zero_point: true);
256}
257
258int v9fs_init_inode(struct v9fs_session_info *v9ses,
259 struct inode *inode, umode_t mode, dev_t rdev)
260{
261 int err = 0;
262
263 inode_init_owner(idmap: &nop_mnt_idmap, inode, NULL, mode);
264 inode->i_blocks = 0;
265 inode->i_rdev = rdev;
266 simple_inode_init_ts(inode);
267 inode->i_mapping->a_ops = &v9fs_addr_operations;
268 inode->i_private = NULL;
269
270 switch (mode & S_IFMT) {
271 case S_IFIFO:
272 case S_IFBLK:
273 case S_IFCHR:
274 case S_IFSOCK:
275 if (v9fs_proto_dotl(v9ses)) {
276 inode->i_op = &v9fs_file_inode_operations_dotl;
277 } else if (v9fs_proto_dotu(v9ses)) {
278 inode->i_op = &v9fs_file_inode_operations;
279 } else {
280 p9_debug(P9_DEBUG_ERROR,
281 "special files without extended mode\n");
282 err = -EINVAL;
283 goto error;
284 }
285 init_special_inode(inode, inode->i_mode, inode->i_rdev);
286 break;
287 case S_IFREG:
288 if (v9fs_proto_dotl(v9ses)) {
289 inode->i_op = &v9fs_file_inode_operations_dotl;
290 inode->i_fop = &v9fs_file_operations_dotl;
291 } else {
292 inode->i_op = &v9fs_file_inode_operations;
293 inode->i_fop = &v9fs_file_operations;
294 }
295
296 break;
297 case S_IFLNK:
298 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
299 p9_debug(P9_DEBUG_ERROR,
300 "extended modes used with legacy protocol\n");
301 err = -EINVAL;
302 goto error;
303 }
304
305 if (v9fs_proto_dotl(v9ses))
306 inode->i_op = &v9fs_symlink_inode_operations_dotl;
307 else
308 inode->i_op = &v9fs_symlink_inode_operations;
309
310 break;
311 case S_IFDIR:
312 inc_nlink(inode);
313 if (v9fs_proto_dotl(v9ses))
314 inode->i_op = &v9fs_dir_inode_operations_dotl;
315 else if (v9fs_proto_dotu(v9ses))
316 inode->i_op = &v9fs_dir_inode_operations_dotu;
317 else
318 inode->i_op = &v9fs_dir_inode_operations;
319
320 if (v9fs_proto_dotl(v9ses))
321 inode->i_fop = &v9fs_dir_operations_dotl;
322 else
323 inode->i_fop = &v9fs_dir_operations;
324
325 break;
326 default:
327 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n",
328 mode, mode & S_IFMT);
329 err = -EINVAL;
330 goto error;
331 }
332error:
333 return err;
334
335}
336
337/**
338 * v9fs_evict_inode - Remove an inode from the inode cache
339 * @inode: inode to release
340 *
341 */
342void v9fs_evict_inode(struct inode *inode)
343{
344 struct v9fs_inode __maybe_unused *v9inode = V9FS_I(inode);
345 __le32 __maybe_unused version;
346
347 if (!is_bad_inode(inode)) {
348 netfs_wait_for_outstanding_io(inode);
349 truncate_inode_pages_final(&inode->i_data);
350
351 version = cpu_to_le32(v9inode->qid.version);
352 netfs_clear_inode_writeback(inode, aux: &version);
353
354 clear_inode(inode);
355 filemap_fdatawrite(&inode->i_data);
356
357#ifdef CONFIG_9P_FSCACHE
358 if (v9fs_inode_cookie(v9inode))
359 fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false);
360#endif
361 } else
362 clear_inode(inode);
363}
364
365static int v9fs_test_inode(struct inode *inode, void *data)
366{
367 int umode;
368 dev_t rdev;
369 struct v9fs_inode *v9inode = V9FS_I(inode);
370 struct p9_wstat *st = (struct p9_wstat *)data;
371 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
372
373 umode = p9mode2unixmode(v9ses, stat: st, rdev: &rdev);
374 /* don't match inode of different type */
375 if (inode_wrong_type(inode, mode: umode))
376 return 0;
377
378 /* compare qid details */
379 if (memcmp(&v9inode->qid.version,
380 &st->qid.version, sizeof(v9inode->qid.version)))
381 return 0;
382
383 if (v9inode->qid.type != st->qid.type)
384 return 0;
385
386 if (v9inode->qid.path != st->qid.path)
387 return 0;
388 return 1;
389}
390
391static int v9fs_test_new_inode(struct inode *inode, void *data)
392{
393 return 0;
394}
395
396static int v9fs_set_inode(struct inode *inode, void *data)
397{
398 struct v9fs_inode *v9inode = V9FS_I(inode);
399 struct p9_wstat *st = (struct p9_wstat *)data;
400
401 memcpy(to: &v9inode->qid, from: &st->qid, len: sizeof(st->qid));
402 return 0;
403}
404
405static struct inode *v9fs_qid_iget(struct super_block *sb,
406 struct p9_qid *qid,
407 struct p9_wstat *st,
408 int new)
409{
410 dev_t rdev;
411 int retval;
412 umode_t umode;
413 struct inode *inode;
414 struct v9fs_session_info *v9ses = sb->s_fs_info;
415 int (*test)(struct inode *inode, void *data);
416
417 if (new)
418 test = v9fs_test_new_inode;
419 else
420 test = v9fs_test_inode;
421
422 inode = iget5_locked(sb, QID2INO(qid), test, set: v9fs_set_inode, st);
423 if (!inode)
424 return ERR_PTR(error: -ENOMEM);
425 if (!(inode->i_state & I_NEW))
426 return inode;
427 /*
428 * initialize the inode with the stat info
429 * FIXME!! we may need support for stale inodes
430 * later.
431 */
432 inode->i_ino = QID2INO(qid);
433 umode = p9mode2unixmode(v9ses, stat: st, rdev: &rdev);
434 retval = v9fs_init_inode(v9ses, inode, mode: umode, rdev);
435 if (retval)
436 goto error;
437
438 v9fs_stat2inode(stat: st, inode, sb, flags: 0);
439 v9fs_set_netfs_context(inode);
440 v9fs_cache_inode_get_cookie(inode);
441 unlock_new_inode(inode);
442 return inode;
443error:
444 iget_failed(inode);
445 return ERR_PTR(error: retval);
446
447}
448
449struct inode *
450v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
451 struct super_block *sb, int new)
452{
453 struct p9_wstat *st;
454 struct inode *inode = NULL;
455
456 st = p9_client_stat(fid);
457 if (IS_ERR(ptr: st))
458 return ERR_CAST(ptr: st);
459
460 inode = v9fs_qid_iget(sb, qid: &st->qid, st, new);
461 p9stat_free(stbuf: st);
462 kfree(objp: st);
463 return inode;
464}
465
466/**
467 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
468 * plan 9 AT flag.
469 * @flags: flags to convert
470 */
471static int v9fs_at_to_dotl_flags(int flags)
472{
473 int rflags = 0;
474
475 if (flags & AT_REMOVEDIR)
476 rflags |= P9_DOTL_AT_REMOVEDIR;
477
478 return rflags;
479}
480
481/**
482 * v9fs_dec_count - helper functon to drop i_nlink.
483 *
484 * If a directory had nlink <= 2 (including . and ..), then we should not drop
485 * the link count, which indicates the underlying exported fs doesn't maintain
486 * nlink accurately. e.g.
487 * - overlayfs sets nlink to 1 for merged dir
488 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more
489 * than EXT4_LINK_MAX (65000) links.
490 *
491 * @inode: inode whose nlink is being dropped
492 */
493static void v9fs_dec_count(struct inode *inode)
494{
495 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2)
496 drop_nlink(inode);
497}
498
499/**
500 * v9fs_remove - helper function to remove files and directories
501 * @dir: directory inode that is being deleted
502 * @dentry: dentry that is being deleted
503 * @flags: removing a directory
504 *
505 */
506
507static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
508{
509 struct inode *inode;
510 int retval = -EOPNOTSUPP;
511 struct p9_fid *v9fid, *dfid;
512 struct v9fs_session_info *v9ses;
513
514 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
515 dir, dentry, flags);
516
517 v9ses = v9fs_inode2v9ses(inode: dir);
518 inode = d_inode(dentry);
519 dfid = v9fs_parent_fid(dentry);
520 if (IS_ERR(ptr: dfid)) {
521 retval = PTR_ERR(ptr: dfid);
522 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
523 return retval;
524 }
525 if (v9fs_proto_dotl(v9ses))
526 retval = p9_client_unlinkat(dfid, name: dentry->d_name.name,
527 flags: v9fs_at_to_dotl_flags(flags));
528 p9_fid_put(fid: dfid);
529 if (retval == -EOPNOTSUPP) {
530 /* Try the one based on path */
531 v9fid = v9fs_fid_clone(dentry);
532 if (IS_ERR(ptr: v9fid))
533 return PTR_ERR(ptr: v9fid);
534 retval = p9_client_remove(fid: v9fid);
535 }
536 if (!retval) {
537 /*
538 * directories on unlink should have zero
539 * link count
540 */
541 if (flags & AT_REMOVEDIR) {
542 clear_nlink(inode);
543 v9fs_dec_count(inode: dir);
544 } else
545 v9fs_dec_count(inode);
546
547 v9fs_invalidate_inode_attr(inode);
548 v9fs_invalidate_inode_attr(inode: dir);
549
550 /* invalidate all fids associated with dentry */
551 /* NOTE: This will not include open fids */
552 dentry->d_op->d_release(dentry);
553 }
554 return retval;
555}
556
557/**
558 * v9fs_create - Create a file
559 * @v9ses: session information
560 * @dir: directory that dentry is being created in
561 * @dentry: dentry that is being created
562 * @extension: 9p2000.u extension string to support devices, etc.
563 * @perm: create permissions
564 * @mode: open mode
565 *
566 */
567static struct p9_fid *
568v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
569 struct dentry *dentry, char *extension, u32 perm, u8 mode)
570{
571 int err;
572 const unsigned char *name;
573 struct p9_fid *dfid, *ofid = NULL, *fid = NULL;
574 struct inode *inode;
575
576 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
577
578 name = dentry->d_name.name;
579 dfid = v9fs_parent_fid(dentry);
580 if (IS_ERR(ptr: dfid)) {
581 err = PTR_ERR(ptr: dfid);
582 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
583 return ERR_PTR(error: err);
584 }
585
586 /* clone a fid to use for creation */
587 ofid = clone_fid(fid: dfid);
588 if (IS_ERR(ptr: ofid)) {
589 err = PTR_ERR(ptr: ofid);
590 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
591 goto error;
592 }
593
594 err = p9_client_fcreate(fid: ofid, name, perm, mode, extension);
595 if (err < 0) {
596 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
597 goto error;
598 }
599
600 if (!(perm & P9_DMLINK)) {
601 /* now walk from the parent so we can get unopened fid */
602 fid = p9_client_walk(oldfid: dfid, nwname: 1, wnames: &name, clone: 1);
603 if (IS_ERR(ptr: fid)) {
604 err = PTR_ERR(ptr: fid);
605 p9_debug(P9_DEBUG_VFS,
606 "p9_client_walk failed %d\n", err);
607 goto error;
608 }
609 /*
610 * instantiate inode and assign the unopened fid to the dentry
611 */
612 inode = v9fs_get_new_inode_from_fid(v9ses, fid, sb: dir->i_sb);
613 if (IS_ERR(ptr: inode)) {
614 err = PTR_ERR(ptr: inode);
615 p9_debug(P9_DEBUG_VFS,
616 "inode creation failed %d\n", err);
617 goto error;
618 }
619 v9fs_fid_add(dentry, fid: &fid);
620 d_instantiate(dentry, inode);
621 }
622 p9_fid_put(fid: dfid);
623 return ofid;
624error:
625 p9_fid_put(fid: dfid);
626 p9_fid_put(fid: ofid);
627 p9_fid_put(fid);
628 return ERR_PTR(error: err);
629}
630
631/**
632 * v9fs_vfs_create - VFS hook to create a regular file
633 * @idmap: idmap of the mount
634 * @dir: The parent directory
635 * @dentry: The name of file to be created
636 * @mode: The UNIX file mode to set
637 * @excl: True if the file must not yet exist
638 *
639 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called
640 * for mknod(2).
641 *
642 */
643
644static int
645v9fs_vfs_create(struct mnt_idmap *idmap, struct inode *dir,
646 struct dentry *dentry, umode_t mode, bool excl)
647{
648 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode: dir);
649 u32 perm = unixmode2p9mode(v9ses, mode);
650 struct p9_fid *fid;
651
652 /* P9_OEXCL? */
653 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, mode: P9_ORDWR);
654 if (IS_ERR(ptr: fid))
655 return PTR_ERR(ptr: fid);
656
657 v9fs_invalidate_inode_attr(inode: dir);
658 p9_fid_put(fid);
659
660 return 0;
661}
662
663/**
664 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
665 * @idmap: idmap of the mount
666 * @dir: inode that is being unlinked
667 * @dentry: dentry that is being unlinked
668 * @mode: mode for new directory
669 *
670 */
671
672static struct dentry *v9fs_vfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
673 struct dentry *dentry, umode_t mode)
674{
675 int err;
676 u32 perm;
677 struct p9_fid *fid;
678 struct v9fs_session_info *v9ses;
679
680 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
681 err = 0;
682 v9ses = v9fs_inode2v9ses(inode: dir);
683 perm = unixmode2p9mode(v9ses, mode: mode | S_IFDIR);
684 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, mode: P9_OREAD);
685 if (IS_ERR(ptr: fid)) {
686 err = PTR_ERR(ptr: fid);
687 fid = NULL;
688 } else {
689 inc_nlink(inode: dir);
690 v9fs_invalidate_inode_attr(inode: dir);
691 }
692
693 if (fid)
694 p9_fid_put(fid);
695 return ERR_PTR(error: err);
696}
697
698/**
699 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
700 * @dir: inode that is being walked from
701 * @dentry: dentry that is being walked to?
702 * @flags: lookup flags (unused)
703 *
704 */
705
706struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
707 unsigned int flags)
708{
709 struct dentry *res;
710 struct v9fs_session_info *v9ses;
711 struct p9_fid *dfid, *fid;
712 struct inode *inode;
713 const unsigned char *name;
714
715 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n",
716 dir, dentry, dentry, flags);
717
718 if (dentry->d_name.len > NAME_MAX)
719 return ERR_PTR(error: -ENAMETOOLONG);
720
721 v9ses = v9fs_inode2v9ses(inode: dir);
722 /* We can walk d_parent because we hold the dir->i_mutex */
723 dfid = v9fs_parent_fid(dentry);
724 if (IS_ERR(ptr: dfid))
725 return ERR_CAST(ptr: dfid);
726
727 /*
728 * Make sure we don't use a wrong inode due to parallel
729 * unlink. For cached mode create calls request for new
730 * inode. But with cache disabled, lookup should do this.
731 */
732 name = dentry->d_name.name;
733 fid = p9_client_walk(oldfid: dfid, nwname: 1, wnames: &name, clone: 1);
734 p9_fid_put(fid: dfid);
735 if (fid == ERR_PTR(error: -ENOENT))
736 inode = NULL;
737 else if (IS_ERR(ptr: fid))
738 inode = ERR_CAST(ptr: fid);
739 else if (v9ses->cache & (CACHE_META|CACHE_LOOSE))
740 inode = v9fs_get_inode_from_fid(v9ses, fid, sb: dir->i_sb);
741 else
742 inode = v9fs_get_new_inode_from_fid(v9ses, fid, sb: dir->i_sb);
743 /*
744 * If we had a rename on the server and a parallel lookup
745 * for the new name, then make sure we instantiate with
746 * the new name. ie look up for a/b, while on server somebody
747 * moved b under k and client parallely did a lookup for
748 * k/b.
749 */
750 res = d_splice_alias(inode, dentry);
751 if (!IS_ERR(ptr: fid)) {
752 if (!res)
753 v9fs_fid_add(dentry, fid: &fid);
754 else if (!IS_ERR(ptr: res))
755 v9fs_fid_add(dentry: res, fid: &fid);
756 else
757 p9_fid_put(fid);
758 }
759 return res;
760}
761
762static int
763v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
764 struct file *file, unsigned int flags, umode_t mode)
765{
766 int err;
767 u32 perm;
768 struct v9fs_inode __maybe_unused *v9inode;
769 struct v9fs_session_info *v9ses;
770 struct p9_fid *fid;
771 struct inode *inode;
772 int p9_omode;
773
774 if (d_in_lookup(dentry)) {
775 struct dentry *res = v9fs_vfs_lookup(dir, dentry, flags: 0);
776 if (res || d_really_is_positive(dentry))
777 return finish_no_open(file, dentry: res);
778 }
779
780 /* Only creates */
781 if (!(flags & O_CREAT))
782 return finish_no_open(file, NULL);
783
784 v9ses = v9fs_inode2v9ses(inode: dir);
785 perm = unixmode2p9mode(v9ses, mode);
786 p9_omode = v9fs_uflags2omode(uflags: flags, extended: v9fs_proto_dotu(v9ses));
787
788 if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) {
789 p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR;
790 p9_debug(P9_DEBUG_CACHE,
791 "write-only file with writeback enabled, creating w/ O_RDWR\n");
792 }
793 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, mode: p9_omode);
794 if (IS_ERR(ptr: fid))
795 return PTR_ERR(ptr: fid);
796
797 v9fs_invalidate_inode_attr(inode: dir);
798 inode = d_inode(dentry);
799 v9inode = V9FS_I(inode);
800 err = finish_open(file, dentry, open: generic_file_open);
801 if (unlikely(err)) {
802 p9_fid_put(fid);
803 return err;
804 }
805
806 file->private_data = fid;
807#ifdef CONFIG_9P_FSCACHE
808 if (v9ses->cache & CACHE_FSCACHE)
809 fscache_use_cookie(v9fs_inode_cookie(v9inode),
810 file->f_mode & FMODE_WRITE);
811#endif
812
813 v9fs_fid_add_modes(fid, s_flags: v9ses->flags, s_cache: v9ses->cache, f_flags: file->f_flags);
814 v9fs_open_fid_add(inode, fid: &fid);
815
816 file->f_mode |= FMODE_CREATED;
817 return 0;
818}
819
820/**
821 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
822 * @i: inode that is being unlinked
823 * @d: dentry that is being unlinked
824 *
825 */
826
827int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
828{
829 return v9fs_remove(dir: i, dentry: d, flags: 0);
830}
831
832/**
833 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
834 * @i: inode that is being unlinked
835 * @d: dentry that is being unlinked
836 *
837 */
838
839int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
840{
841 return v9fs_remove(dir: i, dentry: d, AT_REMOVEDIR);
842}
843
844/**
845 * v9fs_vfs_rename - VFS hook to rename an inode
846 * @idmap: The idmap of the mount
847 * @old_dir: old dir inode
848 * @old_dentry: old dentry
849 * @new_dir: new dir inode
850 * @new_dentry: new dentry
851 * @flags: RENAME_* flags
852 *
853 */
854
855int
856v9fs_vfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
857 struct dentry *old_dentry, struct inode *new_dir,
858 struct dentry *new_dentry, unsigned int flags)
859{
860 int retval;
861 struct inode *old_inode;
862 struct inode *new_inode;
863 struct v9fs_session_info *v9ses;
864 struct p9_fid *oldfid = NULL, *dfid = NULL;
865 struct p9_fid *olddirfid = NULL;
866 struct p9_fid *newdirfid = NULL;
867 struct p9_wstat wstat;
868
869 if (flags)
870 return -EINVAL;
871
872 p9_debug(P9_DEBUG_VFS, "\n");
873 old_inode = d_inode(dentry: old_dentry);
874 new_inode = d_inode(dentry: new_dentry);
875 v9ses = v9fs_inode2v9ses(inode: old_inode);
876 oldfid = v9fs_fid_lookup(dentry: old_dentry);
877 if (IS_ERR(ptr: oldfid))
878 return PTR_ERR(ptr: oldfid);
879
880 dfid = v9fs_parent_fid(dentry: old_dentry);
881 olddirfid = clone_fid(fid: dfid);
882 p9_fid_put(fid: dfid);
883 dfid = NULL;
884
885 if (IS_ERR(ptr: olddirfid)) {
886 retval = PTR_ERR(ptr: olddirfid);
887 goto error;
888 }
889
890 dfid = v9fs_parent_fid(dentry: new_dentry);
891 newdirfid = clone_fid(fid: dfid);
892 p9_fid_put(fid: dfid);
893 dfid = NULL;
894
895 if (IS_ERR(ptr: newdirfid)) {
896 retval = PTR_ERR(ptr: newdirfid);
897 goto error;
898 }
899
900 down_write(sem: &v9ses->rename_sem);
901 if (v9fs_proto_dotl(v9ses)) {
902 retval = p9_client_renameat(olddirfid, old_name: old_dentry->d_name.name,
903 newdirfid, new_name: new_dentry->d_name.name);
904 if (retval == -EOPNOTSUPP)
905 retval = p9_client_rename(fid: oldfid, newdirfid,
906 name: new_dentry->d_name.name);
907 if (retval != -EOPNOTSUPP)
908 goto error_locked;
909 }
910 if (old_dentry->d_parent != new_dentry->d_parent) {
911 /*
912 * 9P .u can only handle file rename in the same directory
913 */
914
915 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
916 retval = -EXDEV;
917 goto error_locked;
918 }
919 v9fs_blank_wstat(wstat: &wstat);
920 wstat.muid = v9ses->uname;
921 wstat.name = new_dentry->d_name.name;
922 retval = p9_client_wstat(fid: oldfid, wst: &wstat);
923
924error_locked:
925 if (!retval) {
926 if (new_inode) {
927 if (S_ISDIR(new_inode->i_mode))
928 clear_nlink(inode: new_inode);
929 else
930 v9fs_dec_count(inode: new_inode);
931 }
932 if (S_ISDIR(old_inode->i_mode)) {
933 if (!new_inode)
934 inc_nlink(inode: new_dir);
935 v9fs_dec_count(inode: old_dir);
936 }
937 v9fs_invalidate_inode_attr(inode: old_inode);
938 v9fs_invalidate_inode_attr(inode: old_dir);
939 v9fs_invalidate_inode_attr(inode: new_dir);
940
941 /* successful rename */
942 d_move(old_dentry, new_dentry);
943 }
944 up_write(sem: &v9ses->rename_sem);
945
946error:
947 p9_fid_put(fid: newdirfid);
948 p9_fid_put(fid: olddirfid);
949 p9_fid_put(fid: oldfid);
950 return retval;
951}
952
953/**
954 * v9fs_vfs_getattr - retrieve file metadata
955 * @idmap: idmap of the mount
956 * @path: Object to query
957 * @stat: metadata structure to populate
958 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
959 * @flags: AT_STATX_xxx setting
960 *
961 */
962
963static int
964v9fs_vfs_getattr(struct mnt_idmap *idmap, const struct path *path,
965 struct kstat *stat, u32 request_mask, unsigned int flags)
966{
967 struct dentry *dentry = path->dentry;
968 struct inode *inode = d_inode(dentry);
969 struct v9fs_session_info *v9ses;
970 struct p9_fid *fid;
971 struct p9_wstat *st;
972
973 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
974 v9ses = v9fs_dentry2v9ses(dentry);
975 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
976 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
977 return 0;
978 } else if (v9ses->cache & CACHE_WRITEBACK) {
979 if (S_ISREG(inode->i_mode)) {
980 int retval = filemap_fdatawrite(inode->i_mapping);
981
982 if (retval)
983 p9_debug(P9_DEBUG_ERROR,
984 "flushing writeback during getattr returned %d\n", retval);
985 }
986 }
987 fid = v9fs_fid_lookup(dentry);
988 if (IS_ERR(ptr: fid))
989 return PTR_ERR(ptr: fid);
990
991 st = p9_client_stat(fid);
992 p9_fid_put(fid);
993 if (IS_ERR(ptr: st))
994 return PTR_ERR(ptr: st);
995
996 v9fs_stat2inode(stat: st, inode: d_inode(dentry), sb: dentry->d_sb, flags: 0);
997 generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat);
998
999 p9stat_free(stbuf: st);
1000 kfree(objp: st);
1001 return 0;
1002}
1003
1004/**
1005 * v9fs_vfs_setattr - set file metadata
1006 * @idmap: idmap of the mount
1007 * @dentry: file whose metadata to set
1008 * @iattr: metadata assignment structure
1009 *
1010 */
1011
1012static int v9fs_vfs_setattr(struct mnt_idmap *idmap,
1013 struct dentry *dentry, struct iattr *iattr)
1014{
1015 int retval, use_dentry = 0;
1016 struct inode *inode = d_inode(dentry);
1017 struct v9fs_session_info *v9ses;
1018 struct p9_fid *fid = NULL;
1019 struct p9_wstat wstat;
1020
1021 p9_debug(P9_DEBUG_VFS, "\n");
1022 retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
1023 if (retval)
1024 return retval;
1025
1026 v9ses = v9fs_dentry2v9ses(dentry);
1027 if (iattr->ia_valid & ATTR_FILE) {
1028 fid = iattr->ia_file->private_data;
1029 WARN_ON(!fid);
1030 }
1031 if (!fid) {
1032 fid = v9fs_fid_lookup(dentry);
1033 use_dentry = 1;
1034 }
1035 if (IS_ERR(ptr: fid))
1036 return PTR_ERR(ptr: fid);
1037
1038 v9fs_blank_wstat(wstat: &wstat);
1039 if (iattr->ia_valid & ATTR_MODE)
1040 wstat.mode = unixmode2p9mode(v9ses, mode: iattr->ia_mode);
1041
1042 if (iattr->ia_valid & ATTR_MTIME)
1043 wstat.mtime = iattr->ia_mtime.tv_sec;
1044
1045 if (iattr->ia_valid & ATTR_ATIME)
1046 wstat.atime = iattr->ia_atime.tv_sec;
1047
1048 if (iattr->ia_valid & ATTR_SIZE)
1049 wstat.length = iattr->ia_size;
1050
1051 if (v9fs_proto_dotu(v9ses)) {
1052 if (iattr->ia_valid & ATTR_UID)
1053 wstat.n_uid = iattr->ia_uid;
1054
1055 if (iattr->ia_valid & ATTR_GID)
1056 wstat.n_gid = iattr->ia_gid;
1057 }
1058
1059 /* Write all dirty data */
1060 if (d_is_reg(dentry)) {
1061 retval = filemap_fdatawrite(inode->i_mapping);
1062 if (retval)
1063 p9_debug(P9_DEBUG_ERROR,
1064 "flushing writeback during setattr returned %d\n", retval);
1065 }
1066
1067 retval = p9_client_wstat(fid, wst: &wstat);
1068
1069 if (use_dentry)
1070 p9_fid_put(fid);
1071
1072 if (retval < 0)
1073 return retval;
1074
1075 if ((iattr->ia_valid & ATTR_SIZE) &&
1076 iattr->ia_size != i_size_read(inode)) {
1077 truncate_setsize(inode, newsize: iattr->ia_size);
1078 netfs_resize_file(ctx: netfs_inode(inode), new_i_size: iattr->ia_size, changed_on_server: true);
1079
1080#ifdef CONFIG_9P_FSCACHE
1081 if (v9ses->cache & CACHE_FSCACHE) {
1082 struct v9fs_inode *v9inode = V9FS_I(inode);
1083
1084 fscache_resize_cookie(v9fs_inode_cookie(v9inode), iattr->ia_size);
1085 }
1086#endif
1087 }
1088
1089 v9fs_invalidate_inode_attr(inode);
1090
1091 setattr_copy(&nop_mnt_idmap, inode, attr: iattr);
1092 mark_inode_dirty(inode);
1093 return 0;
1094}
1095
1096/**
1097 * v9fs_stat2inode - populate an inode structure with mistat info
1098 * @stat: Plan 9 metadata (mistat) structure
1099 * @inode: inode to populate
1100 * @sb: superblock of filesystem
1101 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
1102 *
1103 */
1104
1105void
1106v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1107 struct super_block *sb, unsigned int flags)
1108{
1109 umode_t mode;
1110 struct v9fs_session_info *v9ses = sb->s_fs_info;
1111 struct v9fs_inode *v9inode = V9FS_I(inode);
1112
1113 inode_set_atime(inode, sec: stat->atime, nsec: 0);
1114 inode_set_mtime(inode, sec: stat->mtime, nsec: 0);
1115 inode_set_ctime(inode, sec: stat->mtime, nsec: 0);
1116
1117 inode->i_uid = v9ses->dfltuid;
1118 inode->i_gid = v9ses->dfltgid;
1119
1120 if (v9fs_proto_dotu(v9ses)) {
1121 inode->i_uid = stat->n_uid;
1122 inode->i_gid = stat->n_gid;
1123 }
1124 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1125 if (v9fs_proto_dotu(v9ses)) {
1126 unsigned int i_nlink;
1127 /*
1128 * Hadlink support got added later to the .u extension.
1129 * So there can be a server out there that doesn't
1130 * support this even with .u extension. That would
1131 * just leave us with stat->extension being an empty
1132 * string, though.
1133 */
1134 /* HARDLINKCOUNT %u */
1135 if (sscanf(stat->extension,
1136 " HARDLINKCOUNT %u", &i_nlink) == 1)
1137 set_nlink(inode, nlink: i_nlink);
1138 }
1139 }
1140 mode = p9mode2perm(v9ses, stat);
1141 mode |= inode->i_mode & ~S_IALLUGO;
1142 inode->i_mode = mode;
1143
1144 v9inode->netfs.remote_i_size = stat->length;
1145 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
1146 v9fs_i_size_write(inode, i_size: stat->length);
1147 /* not real number of blocks, but 512 byte ones ... */
1148 inode->i_blocks = (stat->length + 512 - 1) >> 9;
1149 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1150}
1151
1152/**
1153 * v9fs_vfs_get_link - follow a symlink path
1154 * @dentry: dentry for symlink
1155 * @inode: inode for symlink
1156 * @done: delayed call for when we are done with the return value
1157 */
1158
1159static const char *v9fs_vfs_get_link(struct dentry *dentry,
1160 struct inode *inode,
1161 struct delayed_call *done)
1162{
1163 struct v9fs_session_info *v9ses;
1164 struct p9_fid *fid;
1165 struct p9_wstat *st;
1166 char *res;
1167
1168 if (!dentry)
1169 return ERR_PTR(error: -ECHILD);
1170
1171 v9ses = v9fs_dentry2v9ses(dentry);
1172 if (!v9fs_proto_dotu(v9ses))
1173 return ERR_PTR(error: -EBADF);
1174
1175 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
1176 fid = v9fs_fid_lookup(dentry);
1177
1178 if (IS_ERR(ptr: fid))
1179 return ERR_CAST(ptr: fid);
1180
1181 st = p9_client_stat(fid);
1182 p9_fid_put(fid);
1183 if (IS_ERR(ptr: st))
1184 return ERR_CAST(ptr: st);
1185
1186 if (!(st->mode & P9_DMSYMLINK)) {
1187 p9stat_free(stbuf: st);
1188 kfree(objp: st);
1189 return ERR_PTR(error: -EINVAL);
1190 }
1191 res = st->extension;
1192 st->extension = NULL;
1193 if (strlen(res) >= PATH_MAX)
1194 res[PATH_MAX - 1] = '\0';
1195
1196 p9stat_free(stbuf: st);
1197 kfree(objp: st);
1198 set_delayed_call(call: done, fn: kfree_link, arg: res);
1199 return res;
1200}
1201
1202/**
1203 * v9fs_vfs_mkspecial - create a special file
1204 * @dir: inode to create special file in
1205 * @dentry: dentry to create
1206 * @perm: mode to create special file
1207 * @extension: 9p2000.u format extension string representing special file
1208 *
1209 */
1210
1211static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1212 u32 perm, const char *extension)
1213{
1214 struct p9_fid *fid;
1215 struct v9fs_session_info *v9ses;
1216
1217 v9ses = v9fs_inode2v9ses(inode: dir);
1218 if (!v9fs_proto_dotu(v9ses)) {
1219 p9_debug(P9_DEBUG_ERROR, "not extended\n");
1220 return -EPERM;
1221 }
1222
1223 fid = v9fs_create(v9ses, dir, dentry, extension: (char *) extension, perm,
1224 mode: P9_OREAD);
1225 if (IS_ERR(ptr: fid))
1226 return PTR_ERR(ptr: fid);
1227
1228 v9fs_invalidate_inode_attr(inode: dir);
1229 p9_fid_put(fid);
1230 return 0;
1231}
1232
1233/**
1234 * v9fs_vfs_symlink - helper function to create symlinks
1235 * @idmap: idmap of the mount
1236 * @dir: directory inode containing symlink
1237 * @dentry: dentry for symlink
1238 * @symname: symlink data
1239 *
1240 * See Also: 9P2000.u RFC for more information
1241 *
1242 */
1243
1244static int
1245v9fs_vfs_symlink(struct mnt_idmap *idmap, struct inode *dir,
1246 struct dentry *dentry, const char *symname)
1247{
1248 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n",
1249 dir->i_ino, dentry, symname);
1250
1251 return v9fs_vfs_mkspecial(dir, dentry, perm: P9_DMSYMLINK, extension: symname);
1252}
1253
1254#define U32_MAX_DIGITS 10
1255
1256/**
1257 * v9fs_vfs_link - create a hardlink
1258 * @old_dentry: dentry for file to link to
1259 * @dir: inode destination for new link
1260 * @dentry: dentry for link
1261 *
1262 */
1263
1264static int
1265v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1266 struct dentry *dentry)
1267{
1268 int retval;
1269 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */
1270 struct p9_fid *oldfid;
1271
1272 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n",
1273 dir->i_ino, dentry, old_dentry);
1274
1275 oldfid = v9fs_fid_clone(dentry: old_dentry);
1276 if (IS_ERR(ptr: oldfid))
1277 return PTR_ERR(ptr: oldfid);
1278
1279 sprintf(buf: name, fmt: "%d\n", oldfid->fid);
1280 retval = v9fs_vfs_mkspecial(dir, dentry, perm: P9_DMLINK, extension: name);
1281 if (!retval) {
1282 v9fs_refresh_inode(fid: oldfid, inode: d_inode(dentry: old_dentry));
1283 v9fs_invalidate_inode_attr(inode: dir);
1284 }
1285 p9_fid_put(fid: oldfid);
1286 return retval;
1287}
1288
1289/**
1290 * v9fs_vfs_mknod - create a special file
1291 * @idmap: idmap of the mount
1292 * @dir: inode destination for new link
1293 * @dentry: dentry for file
1294 * @mode: mode for creation
1295 * @rdev: device associated with special file
1296 *
1297 */
1298
1299static int
1300v9fs_vfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
1301 struct dentry *dentry, umode_t mode, dev_t rdev)
1302{
1303 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode: dir);
1304 int retval;
1305 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1];
1306 u32 perm;
1307
1308 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
1309 dir->i_ino, dentry, mode,
1310 MAJOR(rdev), MINOR(rdev));
1311
1312 /* build extension */
1313 if (S_ISBLK(mode))
1314 sprintf(buf: name, fmt: "b %u %u", MAJOR(rdev), MINOR(rdev));
1315 else if (S_ISCHR(mode))
1316 sprintf(buf: name, fmt: "c %u %u", MAJOR(rdev), MINOR(rdev));
1317 else
1318 *name = 0;
1319
1320 perm = unixmode2p9mode(v9ses, mode);
1321 retval = v9fs_vfs_mkspecial(dir, dentry, perm, extension: name);
1322
1323 return retval;
1324}
1325
1326int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1327{
1328 int umode;
1329 dev_t rdev;
1330 struct p9_wstat *st;
1331 struct v9fs_session_info *v9ses;
1332 unsigned int flags;
1333
1334 v9ses = v9fs_inode2v9ses(inode);
1335 st = p9_client_stat(fid);
1336 if (IS_ERR(ptr: st))
1337 return PTR_ERR(ptr: st);
1338 /*
1339 * Don't update inode if the file type is different
1340 */
1341 umode = p9mode2unixmode(v9ses, stat: st, rdev: &rdev);
1342 if (inode_wrong_type(inode, mode: umode)) {
1343 /*
1344 * Do this as a way of letting the caller know the inode should not
1345 * be reused
1346 */
1347 v9fs_invalidate_inode_attr(inode);
1348 goto out;
1349 }
1350
1351 /*
1352 * We don't want to refresh inode->i_size,
1353 * because we may have cached data
1354 */
1355 flags = (v9ses->cache & CACHE_LOOSE) ?
1356 V9FS_STAT2INODE_KEEP_ISIZE : 0;
1357 v9fs_stat2inode(stat: st, inode, sb: inode->i_sb, flags);
1358out:
1359 p9stat_free(stbuf: st);
1360 kfree(objp: st);
1361 return 0;
1362}
1363
1364static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1365 .create = v9fs_vfs_create,
1366 .lookup = v9fs_vfs_lookup,
1367 .atomic_open = v9fs_vfs_atomic_open,
1368 .symlink = v9fs_vfs_symlink,
1369 .link = v9fs_vfs_link,
1370 .unlink = v9fs_vfs_unlink,
1371 .mkdir = v9fs_vfs_mkdir,
1372 .rmdir = v9fs_vfs_rmdir,
1373 .mknod = v9fs_vfs_mknod,
1374 .rename = v9fs_vfs_rename,
1375 .getattr = v9fs_vfs_getattr,
1376 .setattr = v9fs_vfs_setattr,
1377};
1378
1379static const struct inode_operations v9fs_dir_inode_operations = {
1380 .create = v9fs_vfs_create,
1381 .lookup = v9fs_vfs_lookup,
1382 .atomic_open = v9fs_vfs_atomic_open,
1383 .unlink = v9fs_vfs_unlink,
1384 .mkdir = v9fs_vfs_mkdir,
1385 .rmdir = v9fs_vfs_rmdir,
1386 .mknod = v9fs_vfs_mknod,
1387 .rename = v9fs_vfs_rename,
1388 .getattr = v9fs_vfs_getattr,
1389 .setattr = v9fs_vfs_setattr,
1390};
1391
1392static const struct inode_operations v9fs_file_inode_operations = {
1393 .getattr = v9fs_vfs_getattr,
1394 .setattr = v9fs_vfs_setattr,
1395};
1396
1397static const struct inode_operations v9fs_symlink_inode_operations = {
1398 .get_link = v9fs_vfs_get_link,
1399 .getattr = v9fs_vfs_getattr,
1400 .setattr = v9fs_vfs_setattr,
1401};
1402
1403