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1/*
2 * linux/fs/9p/vfs_inode.c
3 *
4 * This file contains vfs inode ops for the 9P2000 protocol.
5 *
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26#include <linux/module.h>
27#include <linux/errno.h>
28#include <linux/fs.h>
29#include <linux/file.h>
30#include <linux/pagemap.h>
31#include <linux/stat.h>
32#include <linux/string.h>
33#include <linux/inet.h>
34#include <linux/namei.h>
35#include <linux/idr.h>
36#include <linux/sched.h>
37#include <linux/slab.h>
38#include <linux/xattr.h>
39#include <linux/posix_acl.h>
40#include <net/9p/9p.h>
41#include <net/9p/client.h>
42
43#include "v9fs.h"
44#include "v9fs_vfs.h"
45#include "fid.h"
46#include "cache.h"
47#include "xattr.h"
48#include "acl.h"
49
50static const struct inode_operations v9fs_dir_inode_operations;
51static const struct inode_operations v9fs_dir_inode_operations_dotu;
52static const struct inode_operations v9fs_file_inode_operations;
53static const struct inode_operations v9fs_symlink_inode_operations;
54
55/**
56 * unixmode2p9mode - convert unix mode bits to plan 9
57 * @v9ses: v9fs session information
58 * @mode: mode to convert
59 *
60 */
61
62static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
63{
64 int res;
65 res = mode & 0777;
66 if (S_ISDIR(mode))
67 res |= P9_DMDIR;
68 if (v9fs_proto_dotu(v9ses)) {
69 if (S_ISLNK(mode))
70 res |= P9_DMSYMLINK;
71 if (v9ses->nodev == 0) {
72 if (S_ISSOCK(mode))
73 res |= P9_DMSOCKET;
74 if (S_ISFIFO(mode))
75 res |= P9_DMNAMEDPIPE;
76 if (S_ISBLK(mode))
77 res |= P9_DMDEVICE;
78 if (S_ISCHR(mode))
79 res |= P9_DMDEVICE;
80 }
81
82 if ((mode & S_ISUID) == S_ISUID)
83 res |= P9_DMSETUID;
84 if ((mode & S_ISGID) == S_ISGID)
85 res |= P9_DMSETGID;
86 if ((mode & S_ISVTX) == S_ISVTX)
87 res |= P9_DMSETVTX;
88 if ((mode & P9_DMLINK))
89 res |= P9_DMLINK;
90 }
91
92 return res;
93}
94
95/**
96 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
97 * @v9ses: v9fs session information
98 * @stat: p9_wstat from which mode need to be derived
99 * @rdev: major number, minor number in case of device files.
100 *
101 */
102static int p9mode2unixmode(struct v9fs_session_info *v9ses,
103 struct p9_wstat *stat, dev_t *rdev)
104{
105 int res;
106 int mode = stat->mode;
107
108 res = mode & S_IALLUGO;
109 *rdev = 0;
110
111 if ((mode & P9_DMDIR) == P9_DMDIR)
112 res |= S_IFDIR;
113 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
114 res |= S_IFLNK;
115 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
116 && (v9ses->nodev == 0))
117 res |= S_IFSOCK;
118 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
119 && (v9ses->nodev == 0))
120 res |= S_IFIFO;
121 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
122 && (v9ses->nodev == 0)) {
123 char type = 0, ext[32];
124 int major = -1, minor = -1;
125
126 strncpy(ext, stat->extension, sizeof(ext));
127 sscanf(ext, "%c %u %u", &type, &major, &minor);
128 switch (type) {
129 case 'c':
130 res |= S_IFCHR;
131 break;
132 case 'b':
133 res |= S_IFBLK;
134 break;
135 default:
136 P9_DPRINTK(P9_DEBUG_ERROR,
137 "Unknown special type %c %s\n", type,
138 stat->extension);
139 };
140 *rdev = MKDEV(major, minor);
141 } else
142 res |= S_IFREG;
143
144 if (v9fs_proto_dotu(v9ses)) {
145 if ((mode & P9_DMSETUID) == P9_DMSETUID)
146 res |= S_ISUID;
147
148 if ((mode & P9_DMSETGID) == P9_DMSETGID)
149 res |= S_ISGID;
150
151 if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
152 res |= S_ISVTX;
153 }
154 return res;
155}
156
157/**
158 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
159 * @uflags: flags to convert
160 * @extended: if .u extensions are active
161 */
162
163int v9fs_uflags2omode(int uflags, int extended)
164{
165 int ret;
166
167 ret = 0;
168 switch (uflags&3) {
169 default:
170 case O_RDONLY:
171 ret = P9_OREAD;
172 break;
173
174 case O_WRONLY:
175 ret = P9_OWRITE;
176 break;
177
178 case O_RDWR:
179 ret = P9_ORDWR;
180 break;
181 }
182
183 if (uflags & O_TRUNC)
184 ret |= P9_OTRUNC;
185
186 if (extended) {
187 if (uflags & O_EXCL)
188 ret |= P9_OEXCL;
189
190 if (uflags & O_APPEND)
191 ret |= P9_OAPPEND;
192 }
193
194 return ret;
195}
196
197/**
198 * v9fs_blank_wstat - helper function to setup a 9P stat structure
199 * @wstat: structure to initialize
200 *
201 */
202
203void
204v9fs_blank_wstat(struct p9_wstat *wstat)
205{
206 wstat->type = ~0;
207 wstat->dev = ~0;
208 wstat->qid.type = ~0;
209 wstat->qid.version = ~0;
210 *((long long *)&wstat->qid.path) = ~0;
211 wstat->mode = ~0;
212 wstat->atime = ~0;
213 wstat->mtime = ~0;
214 wstat->length = ~0;
215 wstat->name = NULL;
216 wstat->uid = NULL;
217 wstat->gid = NULL;
218 wstat->muid = NULL;
219 wstat->n_uid = ~0;
220 wstat->n_gid = ~0;
221 wstat->n_muid = ~0;
222 wstat->extension = NULL;
223}
224
225/**
226 * v9fs_alloc_inode - helper function to allocate an inode
227 *
228 */
229struct inode *v9fs_alloc_inode(struct super_block *sb)
230{
231 struct v9fs_inode *v9inode;
232 v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache,
233 GFP_KERNEL);
234 if (!v9inode)
235 return NULL;
236#ifdef CONFIG_9P_FSCACHE
237 v9inode->fscache = NULL;
238 spin_lock_init(&v9inode->fscache_lock);
239#endif
240 v9inode->writeback_fid = NULL;
241 v9inode->cache_validity = 0;
242 mutex_init(&v9inode->v_mutex);
243 return &v9inode->vfs_inode;
244}
245
246/**
247 * v9fs_destroy_inode - destroy an inode
248 *
249 */
250
251static void v9fs_i_callback(struct rcu_head *head)
252{
253 struct inode *inode = container_of(head, struct inode, i_rcu);
254 INIT_LIST_HEAD(&inode->i_dentry);
255 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
256}
257
258void v9fs_destroy_inode(struct inode *inode)
259{
260 call_rcu(&inode->i_rcu, v9fs_i_callback);
261}
262
263int v9fs_init_inode(struct v9fs_session_info *v9ses,
264 struct inode *inode, int mode, dev_t rdev)
265{
266 int err = 0;
267
268 inode_init_owner(inode, NULL, mode);
269 inode->i_blocks = 0;
270 inode->i_rdev = rdev;
271 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
272 inode->i_mapping->a_ops = &v9fs_addr_operations;
273
274 switch (mode & S_IFMT) {
275 case S_IFIFO:
276 case S_IFBLK:
277 case S_IFCHR:
278 case S_IFSOCK:
279 if (v9fs_proto_dotl(v9ses)) {
280 inode->i_op = &v9fs_file_inode_operations_dotl;
281 inode->i_fop = &v9fs_file_operations_dotl;
282 } else if (v9fs_proto_dotu(v9ses)) {
283 inode->i_op = &v9fs_file_inode_operations;
284 inode->i_fop = &v9fs_file_operations;
285 } else {
286 P9_DPRINTK(P9_DEBUG_ERROR,
287 "special files without extended mode\n");
288 err = -EINVAL;
289 goto error;
290 }
291 init_special_inode(inode, inode->i_mode, inode->i_rdev);
292 break;
293 case S_IFREG:
294 if (v9fs_proto_dotl(v9ses)) {
295 inode->i_op = &v9fs_file_inode_operations_dotl;
296 if (v9ses->cache)
297 inode->i_fop =
298 &v9fs_cached_file_operations_dotl;
299 else
300 inode->i_fop = &v9fs_file_operations_dotl;
301 } else {
302 inode->i_op = &v9fs_file_inode_operations;
303 if (v9ses->cache)
304 inode->i_fop = &v9fs_cached_file_operations;
305 else
306 inode->i_fop = &v9fs_file_operations;
307 }
308
309 break;
310 case S_IFLNK:
311 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
312 P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with "
313 "legacy protocol.\n");
314 err = -EINVAL;
315 goto error;
316 }
317
318 if (v9fs_proto_dotl(v9ses))
319 inode->i_op = &v9fs_symlink_inode_operations_dotl;
320 else
321 inode->i_op = &v9fs_symlink_inode_operations;
322
323 break;
324 case S_IFDIR:
325 inc_nlink(inode);
326 if (v9fs_proto_dotl(v9ses))
327 inode->i_op = &v9fs_dir_inode_operations_dotl;
328 else if (v9fs_proto_dotu(v9ses))
329 inode->i_op = &v9fs_dir_inode_operations_dotu;
330 else
331 inode->i_op = &v9fs_dir_inode_operations;
332
333 if (v9fs_proto_dotl(v9ses))
334 inode->i_fop = &v9fs_dir_operations_dotl;
335 else
336 inode->i_fop = &v9fs_dir_operations;
337
338 break;
339 default:
340 P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
341 mode, mode & S_IFMT);
342 err = -EINVAL;
343 goto error;
344 }
345error:
346 return err;
347
348}
349
350/**
351 * v9fs_get_inode - helper function to setup an inode
352 * @sb: superblock
353 * @mode: mode to setup inode with
354 *
355 */
356
357struct inode *v9fs_get_inode(struct super_block *sb, int mode, dev_t rdev)
358{
359 int err;
360 struct inode *inode;
361 struct v9fs_session_info *v9ses = sb->s_fs_info;
362
363 P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
364
365 inode = new_inode(sb);
366 if (!inode) {
367 P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n");
368 return ERR_PTR(-ENOMEM);
369 }
370 err = v9fs_init_inode(v9ses, inode, mode, rdev);
371 if (err) {
372 iput(inode);
373 return ERR_PTR(err);
374 }
375 return inode;
376}
377
378/*
379static struct v9fs_fid*
380v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
381{
382 int err;
383 int nfid;
384 struct v9fs_fid *ret;
385 struct v9fs_fcall *fcall;
386
387 nfid = v9fs_get_idpool(&v9ses->fidpool);
388 if (nfid < 0) {
389 eprintk(KERN_WARNING, "no free fids available\n");
390 return ERR_PTR(-ENOSPC);
391 }
392
393 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
394 &fcall);
395
396 if (err < 0) {
397 if (fcall && fcall->id == RWALK)
398 goto clunk_fid;
399
400 PRINT_FCALL_ERROR("walk error", fcall);
401 v9fs_put_idpool(nfid, &v9ses->fidpool);
402 goto error;
403 }
404
405 kfree(fcall);
406 fcall = NULL;
407 ret = v9fs_fid_create(v9ses, nfid);
408 if (!ret) {
409 err = -ENOMEM;
410 goto clunk_fid;
411 }
412
413 err = v9fs_fid_insert(ret, dentry);
414 if (err < 0) {
415 v9fs_fid_destroy(ret);
416 goto clunk_fid;
417 }
418
419 return ret;
420
421clunk_fid:
422 v9fs_t_clunk(v9ses, nfid);
423
424error:
425 kfree(fcall);
426 return ERR_PTR(err);
427}
428*/
429
430
431/**
432 * v9fs_clear_inode - release an inode
433 * @inode: inode to release
434 *
435 */
436void v9fs_evict_inode(struct inode *inode)
437{
438 struct v9fs_inode *v9inode = V9FS_I(inode);
439
440 truncate_inode_pages(inode->i_mapping, 0);
441 end_writeback(inode);
442 filemap_fdatawrite(inode->i_mapping);
443
444#ifdef CONFIG_9P_FSCACHE
445 v9fs_cache_inode_put_cookie(inode);
446#endif
447 /* clunk the fid stashed in writeback_fid */
448 if (v9inode->writeback_fid) {
449 p9_client_clunk(v9inode->writeback_fid);
450 v9inode->writeback_fid = NULL;
451 }
452}
453
454static int v9fs_test_inode(struct inode *inode, void *data)
455{
456 int umode;
457 dev_t rdev;
458 struct v9fs_inode *v9inode = V9FS_I(inode);
459 struct p9_wstat *st = (struct p9_wstat *)data;
460 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
461
462 umode = p9mode2unixmode(v9ses, st, &rdev);
463 /* don't match inode of different type */
464 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
465 return 0;
466
467 /* compare qid details */
468 if (memcmp(&v9inode->qid.version,
469 &st->qid.version, sizeof(v9inode->qid.version)))
470 return 0;
471
472 if (v9inode->qid.type != st->qid.type)
473 return 0;
474 return 1;
475}
476
477static int v9fs_test_new_inode(struct inode *inode, void *data)
478{
479 return 0;
480}
481
482static int v9fs_set_inode(struct inode *inode, void *data)
483{
484 struct v9fs_inode *v9inode = V9FS_I(inode);
485 struct p9_wstat *st = (struct p9_wstat *)data;
486
487 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
488 return 0;
489}
490
491static struct inode *v9fs_qid_iget(struct super_block *sb,
492 struct p9_qid *qid,
493 struct p9_wstat *st,
494 int new)
495{
496 dev_t rdev;
497 int retval, umode;
498 unsigned long i_ino;
499 struct inode *inode;
500 struct v9fs_session_info *v9ses = sb->s_fs_info;
501 int (*test)(struct inode *, void *);
502
503 if (new)
504 test = v9fs_test_new_inode;
505 else
506 test = v9fs_test_inode;
507
508 i_ino = v9fs_qid2ino(qid);
509 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
510 if (!inode)
511 return ERR_PTR(-ENOMEM);
512 if (!(inode->i_state & I_NEW))
513 return inode;
514 /*
515 * initialize the inode with the stat info
516 * FIXME!! we may need support for stale inodes
517 * later.
518 */
519 inode->i_ino = i_ino;
520 umode = p9mode2unixmode(v9ses, st, &rdev);
521 retval = v9fs_init_inode(v9ses, inode, umode, rdev);
522 if (retval)
523 goto error;
524
525 v9fs_stat2inode(st, inode, sb);
526#ifdef CONFIG_9P_FSCACHE
527 v9fs_cache_inode_get_cookie(inode);
528#endif
529 unlock_new_inode(inode);
530 return inode;
531error:
532 unlock_new_inode(inode);
533 iput(inode);
534 return ERR_PTR(retval);
535
536}
537
538struct inode *
539v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
540 struct super_block *sb, int new)
541{
542 struct p9_wstat *st;
543 struct inode *inode = NULL;
544
545 st = p9_client_stat(fid);
546 if (IS_ERR(st))
547 return ERR_CAST(st);
548
549 inode = v9fs_qid_iget(sb, &st->qid, st, new);
550 p9stat_free(st);
551 kfree(st);
552 return inode;
553}
554
555/**
556 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
557 * plan 9 AT flag.
558 * @flags: flags to convert
559 */
560static int v9fs_at_to_dotl_flags(int flags)
561{
562 int rflags = 0;
563 if (flags & AT_REMOVEDIR)
564 rflags |= P9_DOTL_AT_REMOVEDIR;
565 return rflags;
566}
567
568/**
569 * v9fs_remove - helper function to remove files and directories
570 * @dir: directory inode that is being deleted
571 * @dentry: dentry that is being deleted
572 * @rmdir: removing a directory
573 *
574 */
575
576static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
577{
578 struct inode *inode;
579 int retval = -EOPNOTSUPP;
580 struct p9_fid *v9fid, *dfid;
581 struct v9fs_session_info *v9ses;
582
583 P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
584 dir, dentry, flags);
585
586 v9ses = v9fs_inode2v9ses(dir);
587 inode = dentry->d_inode;
588 dfid = v9fs_fid_lookup(dentry->d_parent);
589 if (IS_ERR(dfid)) {
590 retval = PTR_ERR(dfid);
591 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
592 return retval;
593 }
594 if (v9fs_proto_dotl(v9ses))
595 retval = p9_client_unlinkat(dfid, dentry->d_name.name,
596 v9fs_at_to_dotl_flags(flags));
597 if (retval == -EOPNOTSUPP) {
598 /* Try the one based on path */
599 v9fid = v9fs_fid_clone(dentry);
600 if (IS_ERR(v9fid))
601 return PTR_ERR(v9fid);
602 retval = p9_client_remove(v9fid);
603 }
604 if (!retval) {
605 /*
606 * directories on unlink should have zero
607 * link count
608 */
609 if (flags & AT_REMOVEDIR) {
610 clear_nlink(inode);
611 drop_nlink(dir);
612 } else
613 drop_nlink(inode);
614
615 v9fs_invalidate_inode_attr(inode);
616 v9fs_invalidate_inode_attr(dir);
617 }
618 return retval;
619}
620
621/**
622 * v9fs_create - Create a file
623 * @v9ses: session information
624 * @dir: directory that dentry is being created in
625 * @dentry: dentry that is being created
626 * @extension: 9p2000.u extension string to support devices, etc.
627 * @perm: create permissions
628 * @mode: open mode
629 *
630 */
631static struct p9_fid *
632v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
633 struct dentry *dentry, char *extension, u32 perm, u8 mode)
634{
635 int err;
636 char *name;
637 struct p9_fid *dfid, *ofid, *fid;
638 struct inode *inode;
639
640 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
641
642 err = 0;
643 ofid = NULL;
644 fid = NULL;
645 name = (char *) dentry->d_name.name;
646 dfid = v9fs_fid_lookup(dentry->d_parent);
647 if (IS_ERR(dfid)) {
648 err = PTR_ERR(dfid);
649 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
650 return ERR_PTR(err);
651 }
652
653 /* clone a fid to use for creation */
654 ofid = p9_client_walk(dfid, 0, NULL, 1);
655 if (IS_ERR(ofid)) {
656 err = PTR_ERR(ofid);
657 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
658 return ERR_PTR(err);
659 }
660
661 err = p9_client_fcreate(ofid, name, perm, mode, extension);
662 if (err < 0) {
663 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
664 goto error;
665 }
666
667 /* now walk from the parent so we can get unopened fid */
668 fid = p9_client_walk(dfid, 1, &name, 1);
669 if (IS_ERR(fid)) {
670 err = PTR_ERR(fid);
671 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
672 fid = NULL;
673 goto error;
674 }
675
676 /* instantiate inode and assign the unopened fid to the dentry */
677 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
678 if (IS_ERR(inode)) {
679 err = PTR_ERR(inode);
680 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
681 goto error;
682 }
683 err = v9fs_fid_add(dentry, fid);
684 if (err < 0)
685 goto error;
686 d_instantiate(dentry, inode);
687 return ofid;
688error:
689 if (ofid)
690 p9_client_clunk(ofid);
691
692 if (fid)
693 p9_client_clunk(fid);
694
695 return ERR_PTR(err);
696}
697
698/**
699 * v9fs_vfs_create - VFS hook to create files
700 * @dir: directory inode that is being created
701 * @dentry: dentry that is being deleted
702 * @mode: create permissions
703 * @nd: path information
704 *
705 */
706
707static int
708v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
709 struct nameidata *nd)
710{
711 int err;
712 u32 perm;
713 int flags;
714 struct file *filp;
715 struct v9fs_inode *v9inode;
716 struct v9fs_session_info *v9ses;
717 struct p9_fid *fid, *inode_fid;
718
719 err = 0;
720 fid = NULL;
721 v9ses = v9fs_inode2v9ses(dir);
722 perm = unixmode2p9mode(v9ses, mode);
723 if (nd)
724 flags = nd->intent.open.flags;
725 else
726 flags = O_RDWR;
727
728 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
729 v9fs_uflags2omode(flags,
730 v9fs_proto_dotu(v9ses)));
731 if (IS_ERR(fid)) {
732 err = PTR_ERR(fid);
733 fid = NULL;
734 goto error;
735 }
736
737 v9fs_invalidate_inode_attr(dir);
738 /* if we are opening a file, assign the open fid to the file */
739 if (nd) {
740 v9inode = V9FS_I(dentry->d_inode);
741 mutex_lock(&v9inode->v_mutex);
742 if (v9ses->cache && !v9inode->writeback_fid &&
743 ((flags & O_ACCMODE) != O_RDONLY)) {
744 /*
745 * clone a fid and add it to writeback_fid
746 * we do it during open time instead of
747 * page dirty time via write_begin/page_mkwrite
748 * because we want write after unlink usecase
749 * to work.
750 */
751 inode_fid = v9fs_writeback_fid(dentry);
752 if (IS_ERR(inode_fid)) {
753 err = PTR_ERR(inode_fid);
754 mutex_unlock(&v9inode->v_mutex);
755 goto error;
756 }
757 v9inode->writeback_fid = (void *) inode_fid;
758 }
759 mutex_unlock(&v9inode->v_mutex);
760 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
761 if (IS_ERR(filp)) {
762 err = PTR_ERR(filp);
763 goto error;
764 }
765
766 filp->private_data = fid;
767#ifdef CONFIG_9P_FSCACHE
768 if (v9ses->cache)
769 v9fs_cache_inode_set_cookie(dentry->d_inode, filp);
770#endif
771 } else
772 p9_client_clunk(fid);
773
774 return 0;
775
776error:
777 if (fid)
778 p9_client_clunk(fid);
779
780 return err;
781}
782
783/**
784 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
785 * @dir: inode that is being unlinked
786 * @dentry: dentry that is being unlinked
787 * @mode: mode for new directory
788 *
789 */
790
791static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
792{
793 int err;
794 u32 perm;
795 struct p9_fid *fid;
796 struct v9fs_session_info *v9ses;
797
798 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
799 err = 0;
800 v9ses = v9fs_inode2v9ses(dir);
801 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
802 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
803 if (IS_ERR(fid)) {
804 err = PTR_ERR(fid);
805 fid = NULL;
806 } else {
807 inc_nlink(dir);
808 v9fs_invalidate_inode_attr(dir);
809 }
810
811 if (fid)
812 p9_client_clunk(fid);
813
814 return err;
815}
816
817/**
818 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
819 * @dir: inode that is being walked from
820 * @dentry: dentry that is being walked to?
821 * @nameidata: path data
822 *
823 */
824
825struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
826 struct nameidata *nameidata)
827{
828 struct dentry *res;
829 struct super_block *sb;
830 struct v9fs_session_info *v9ses;
831 struct p9_fid *dfid, *fid;
832 struct inode *inode;
833 char *name;
834 int result = 0;
835
836 P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
837 dir, dentry->d_name.name, dentry, nameidata);
838
839 if (dentry->d_name.len > NAME_MAX)
840 return ERR_PTR(-ENAMETOOLONG);
841
842 sb = dir->i_sb;
843 v9ses = v9fs_inode2v9ses(dir);
844 /* We can walk d_parent because we hold the dir->i_mutex */
845 dfid = v9fs_fid_lookup(dentry->d_parent);
846 if (IS_ERR(dfid))
847 return ERR_CAST(dfid);
848
849 name = (char *) dentry->d_name.name;
850 fid = p9_client_walk(dfid, 1, &name, 1);
851 if (IS_ERR(fid)) {
852 result = PTR_ERR(fid);
853 if (result == -ENOENT) {
854 inode = NULL;
855 goto inst_out;
856 }
857
858 return ERR_PTR(result);
859 }
860 /*
861 * Make sure we don't use a wrong inode due to parallel
862 * unlink. For cached mode create calls request for new
863 * inode. But with cache disabled, lookup should do this.
864 */
865 if (v9ses->cache)
866 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
867 else
868 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
869 if (IS_ERR(inode)) {
870 result = PTR_ERR(inode);
871 inode = NULL;
872 goto error;
873 }
874 result = v9fs_fid_add(dentry, fid);
875 if (result < 0)
876 goto error_iput;
877inst_out:
878 /*
879 * If we had a rename on the server and a parallel lookup
880 * for the new name, then make sure we instantiate with
881 * the new name. ie look up for a/b, while on server somebody
882 * moved b under k and client parallely did a lookup for
883 * k/b.
884 */
885 res = d_materialise_unique(dentry, inode);
886 if (!IS_ERR(res))
887 return res;
888 result = PTR_ERR(res);
889error_iput:
890 iput(inode);
891error:
892 p9_client_clunk(fid);
893
894 return ERR_PTR(result);
895}
896
897/**
898 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
899 * @i: inode that is being unlinked
900 * @d: dentry that is being unlinked
901 *
902 */
903
904int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
905{
906 return v9fs_remove(i, d, 0);
907}
908
909/**
910 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
911 * @i: inode that is being unlinked
912 * @d: dentry that is being unlinked
913 *
914 */
915
916int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
917{
918 return v9fs_remove(i, d, AT_REMOVEDIR);
919}
920
921/**
922 * v9fs_vfs_rename - VFS hook to rename an inode
923 * @old_dir: old dir inode
924 * @old_dentry: old dentry
925 * @new_dir: new dir inode
926 * @new_dentry: new dentry
927 *
928 */
929
930int
931v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
932 struct inode *new_dir, struct dentry *new_dentry)
933{
934 int retval;
935 struct inode *old_inode;
936 struct inode *new_inode;
937 struct v9fs_session_info *v9ses;
938 struct p9_fid *oldfid;
939 struct p9_fid *olddirfid;
940 struct p9_fid *newdirfid;
941 struct p9_wstat wstat;
942
943 P9_DPRINTK(P9_DEBUG_VFS, "\n");
944 retval = 0;
945 old_inode = old_dentry->d_inode;
946 new_inode = new_dentry->d_inode;
947 v9ses = v9fs_inode2v9ses(old_inode);
948 oldfid = v9fs_fid_lookup(old_dentry);
949 if (IS_ERR(oldfid))
950 return PTR_ERR(oldfid);
951
952 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
953 if (IS_ERR(olddirfid)) {
954 retval = PTR_ERR(olddirfid);
955 goto done;
956 }
957
958 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
959 if (IS_ERR(newdirfid)) {
960 retval = PTR_ERR(newdirfid);
961 goto clunk_olddir;
962 }
963
964 down_write(&v9ses->rename_sem);
965 if (v9fs_proto_dotl(v9ses)) {
966 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
967 newdirfid, new_dentry->d_name.name);
968 if (retval == -EOPNOTSUPP)
969 retval = p9_client_rename(oldfid, newdirfid,
970 new_dentry->d_name.name);
971 if (retval != -EOPNOTSUPP)
972 goto clunk_newdir;
973 }
974 if (old_dentry->d_parent != new_dentry->d_parent) {
975 /*
976 * 9P .u can only handle file rename in the same directory
977 */
978
979 P9_DPRINTK(P9_DEBUG_ERROR,
980 "old dir and new dir are different\n");
981 retval = -EXDEV;
982 goto clunk_newdir;
983 }
984 v9fs_blank_wstat(&wstat);
985 wstat.muid = v9ses->uname;
986 wstat.name = (char *) new_dentry->d_name.name;
987 retval = p9_client_wstat(oldfid, &wstat);
988
989clunk_newdir:
990 if (!retval) {
991 if (new_inode) {
992 if (S_ISDIR(new_inode->i_mode))
993 clear_nlink(new_inode);
994 else
995 drop_nlink(new_inode);
996 }
997 if (S_ISDIR(old_inode->i_mode)) {
998 if (!new_inode)
999 inc_nlink(new_dir);
1000 drop_nlink(old_dir);
1001 }
1002 v9fs_invalidate_inode_attr(old_inode);
1003 v9fs_invalidate_inode_attr(old_dir);
1004 v9fs_invalidate_inode_attr(new_dir);
1005
1006 /* successful rename */
1007 d_move(old_dentry, new_dentry);
1008 }
1009 up_write(&v9ses->rename_sem);
1010 p9_client_clunk(newdirfid);
1011
1012clunk_olddir:
1013 p9_client_clunk(olddirfid);
1014
1015done:
1016 return retval;
1017}
1018
1019/**
1020 * v9fs_vfs_getattr - retrieve file metadata
1021 * @mnt: mount information
1022 * @dentry: file to get attributes on
1023 * @stat: metadata structure to populate
1024 *
1025 */
1026
1027static int
1028v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1029 struct kstat *stat)
1030{
1031 int err;
1032 struct v9fs_session_info *v9ses;
1033 struct p9_fid *fid;
1034 struct p9_wstat *st;
1035
1036 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1037 err = -EPERM;
1038 v9ses = v9fs_dentry2v9ses(dentry);
1039 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1040 generic_fillattr(dentry->d_inode, stat);
1041 return 0;
1042 }
1043 fid = v9fs_fid_lookup(dentry);
1044 if (IS_ERR(fid))
1045 return PTR_ERR(fid);
1046
1047 st = p9_client_stat(fid);
1048 if (IS_ERR(st))
1049 return PTR_ERR(st);
1050
1051 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
1052 generic_fillattr(dentry->d_inode, stat);
1053
1054 p9stat_free(st);
1055 kfree(st);
1056 return 0;
1057}
1058
1059/**
1060 * v9fs_vfs_setattr - set file metadata
1061 * @dentry: file whose metadata to set
1062 * @iattr: metadata assignment structure
1063 *
1064 */
1065
1066static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
1067{
1068 int retval;
1069 struct v9fs_session_info *v9ses;
1070 struct p9_fid *fid;
1071 struct p9_wstat wstat;
1072
1073 P9_DPRINTK(P9_DEBUG_VFS, "\n");
1074 retval = inode_change_ok(dentry->d_inode, iattr);
1075 if (retval)
1076 return retval;
1077
1078 retval = -EPERM;
1079 v9ses = v9fs_dentry2v9ses(dentry);
1080 fid = v9fs_fid_lookup(dentry);
1081 if(IS_ERR(fid))
1082 return PTR_ERR(fid);
1083
1084 v9fs_blank_wstat(&wstat);
1085 if (iattr->ia_valid & ATTR_MODE)
1086 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1087
1088 if (iattr->ia_valid & ATTR_MTIME)
1089 wstat.mtime = iattr->ia_mtime.tv_sec;
1090
1091 if (iattr->ia_valid & ATTR_ATIME)
1092 wstat.atime = iattr->ia_atime.tv_sec;
1093
1094 if (iattr->ia_valid & ATTR_SIZE)
1095 wstat.length = iattr->ia_size;
1096
1097 if (v9fs_proto_dotu(v9ses)) {
1098 if (iattr->ia_valid & ATTR_UID)
1099 wstat.n_uid = iattr->ia_uid;
1100
1101 if (iattr->ia_valid & ATTR_GID)
1102 wstat.n_gid = iattr->ia_gid;
1103 }
1104
1105 /* Write all dirty data */
1106 if (S_ISREG(dentry->d_inode->i_mode))
1107 filemap_write_and_wait(dentry->d_inode->i_mapping);
1108
1109 retval = p9_client_wstat(fid, &wstat);
1110 if (retval < 0)
1111 return retval;
1112
1113 if ((iattr->ia_valid & ATTR_SIZE) &&
1114 iattr->ia_size != i_size_read(dentry->d_inode))
1115 truncate_setsize(dentry->d_inode, iattr->ia_size);
1116
1117 v9fs_invalidate_inode_attr(dentry->d_inode);
1118
1119 setattr_copy(dentry->d_inode, iattr);
1120 mark_inode_dirty(dentry->d_inode);
1121 return 0;
1122}
1123
1124/**
1125 * v9fs_stat2inode - populate an inode structure with mistat info
1126 * @stat: Plan 9 metadata (mistat) structure
1127 * @inode: inode to populate
1128 * @sb: superblock of filesystem
1129 *
1130 */
1131
1132void
1133v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1134 struct super_block *sb)
1135{
1136 mode_t mode;
1137 char ext[32];
1138 char tag_name[14];
1139 unsigned int i_nlink;
1140 struct v9fs_session_info *v9ses = sb->s_fs_info;
1141 struct v9fs_inode *v9inode = V9FS_I(inode);
1142
1143 inode->i_nlink = 1;
1144
1145 inode->i_atime.tv_sec = stat->atime;
1146 inode->i_mtime.tv_sec = stat->mtime;
1147 inode->i_ctime.tv_sec = stat->mtime;
1148
1149 inode->i_uid = v9ses->dfltuid;
1150 inode->i_gid = v9ses->dfltgid;
1151
1152 if (v9fs_proto_dotu(v9ses)) {
1153 inode->i_uid = stat->n_uid;
1154 inode->i_gid = stat->n_gid;
1155 }
1156 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1157 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1158 /*
1159 * Hadlink support got added later to
1160 * to the .u extension. So there can be
1161 * server out there that doesn't support
1162 * this even with .u extension. So check
1163 * for non NULL stat->extension
1164 */
1165 strncpy(ext, stat->extension, sizeof(ext));
1166 /* HARDLINKCOUNT %u */
1167 sscanf(ext, "%13s %u", tag_name, &i_nlink);
1168 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1169 inode->i_nlink = i_nlink;
1170 }
1171 }
1172 mode = stat->mode & S_IALLUGO;
1173 mode |= inode->i_mode & ~S_IALLUGO;
1174 inode->i_mode = mode;
1175 i_size_write(inode, stat->length);
1176
1177 /* not real number of blocks, but 512 byte ones ... */
1178 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
1179 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1180}
1181
1182/**
1183 * v9fs_qid2ino - convert qid into inode number
1184 * @qid: qid to hash
1185 *
1186 * BUG: potential for inode number collisions?
1187 */
1188
1189ino_t v9fs_qid2ino(struct p9_qid *qid)
1190{
1191 u64 path = qid->path + 2;
1192 ino_t i = 0;
1193
1194 if (sizeof(ino_t) == sizeof(path))
1195 memcpy(&i, &path, sizeof(ino_t));
1196 else
1197 i = (ino_t) (path ^ (path >> 32));
1198
1199 return i;
1200}
1201
1202/**
1203 * v9fs_readlink - read a symlink's location (internal version)
1204 * @dentry: dentry for symlink
1205 * @buffer: buffer to load symlink location into
1206 * @buflen: length of buffer
1207 *
1208 */
1209
1210static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1211{
1212 int retval;
1213
1214 struct v9fs_session_info *v9ses;
1215 struct p9_fid *fid;
1216 struct p9_wstat *st;
1217
1218 P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1219 retval = -EPERM;
1220 v9ses = v9fs_dentry2v9ses(dentry);
1221 fid = v9fs_fid_lookup(dentry);
1222 if (IS_ERR(fid))
1223 return PTR_ERR(fid);
1224
1225 if (!v9fs_proto_dotu(v9ses))
1226 return -EBADF;
1227
1228 st = p9_client_stat(fid);
1229 if (IS_ERR(st))
1230 return PTR_ERR(st);
1231
1232 if (!(st->mode & P9_DMSYMLINK)) {
1233 retval = -EINVAL;
1234 goto done;
1235 }
1236
1237 /* copy extension buffer into buffer */
1238 strncpy(buffer, st->extension, buflen);
1239
1240 P9_DPRINTK(P9_DEBUG_VFS,
1241 "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer);
1242
1243 retval = strnlen(buffer, buflen);
1244done:
1245 p9stat_free(st);
1246 kfree(st);
1247 return retval;
1248}
1249
1250/**
1251 * v9fs_vfs_follow_link - follow a symlink path
1252 * @dentry: dentry for symlink
1253 * @nd: nameidata
1254 *
1255 */
1256
1257static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1258{
1259 int len = 0;
1260 char *link = __getname();
1261
1262 P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
1263
1264 if (!link)
1265 link = ERR_PTR(-ENOMEM);
1266 else {
1267 len = v9fs_readlink(dentry, link, PATH_MAX);
1268
1269 if (len < 0) {
1270 __putname(link);
1271 link = ERR_PTR(len);
1272 } else
1273 link[min(len, PATH_MAX-1)] = 0;
1274 }
1275 nd_set_link(nd, link);
1276
1277 return NULL;
1278}
1279
1280/**
1281 * v9fs_vfs_put_link - release a symlink path
1282 * @dentry: dentry for symlink
1283 * @nd: nameidata
1284 * @p: unused
1285 *
1286 */
1287
1288void
1289v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1290{
1291 char *s = nd_get_link(nd);
1292
1293 P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
1294 IS_ERR(s) ? "<error>" : s);
1295 if (!IS_ERR(s))
1296 __putname(s);
1297}
1298
1299/**
1300 * v9fs_vfs_mkspecial - create a special file
1301 * @dir: inode to create special file in
1302 * @dentry: dentry to create
1303 * @mode: mode to create special file
1304 * @extension: 9p2000.u format extension string representing special file
1305 *
1306 */
1307
1308static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1309 int mode, const char *extension)
1310{
1311 u32 perm;
1312 struct p9_fid *fid;
1313 struct v9fs_session_info *v9ses;
1314
1315 v9ses = v9fs_inode2v9ses(dir);
1316 if (!v9fs_proto_dotu(v9ses)) {
1317 P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n");
1318 return -EPERM;
1319 }
1320
1321 perm = unixmode2p9mode(v9ses, mode);
1322 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1323 P9_OREAD);
1324 if (IS_ERR(fid))
1325 return PTR_ERR(fid);
1326
1327 v9fs_invalidate_inode_attr(dir);
1328 p9_client_clunk(fid);
1329 return 0;
1330}
1331
1332/**
1333 * v9fs_vfs_symlink - helper function to create symlinks
1334 * @dir: directory inode containing symlink
1335 * @dentry: dentry for symlink
1336 * @symname: symlink data
1337 *
1338 * See Also: 9P2000.u RFC for more information
1339 *
1340 */
1341
1342static int
1343v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1344{
1345 P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino,
1346 dentry->d_name.name, symname);
1347
1348 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1349}
1350
1351/**
1352 * v9fs_vfs_link - create a hardlink
1353 * @old_dentry: dentry for file to link to
1354 * @dir: inode destination for new link
1355 * @dentry: dentry for link
1356 *
1357 */
1358
1359static int
1360v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1361 struct dentry *dentry)
1362{
1363 int retval;
1364 char *name;
1365 struct p9_fid *oldfid;
1366
1367 P9_DPRINTK(P9_DEBUG_VFS,
1368 " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1369 old_dentry->d_name.name);
1370
1371 oldfid = v9fs_fid_clone(old_dentry);
1372 if (IS_ERR(oldfid))
1373 return PTR_ERR(oldfid);
1374
1375 name = __getname();
1376 if (unlikely(!name)) {
1377 retval = -ENOMEM;
1378 goto clunk_fid;
1379 }
1380
1381 sprintf(name, "%d\n", oldfid->fid);
1382 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1383 __putname(name);
1384 if (!retval) {
1385 v9fs_refresh_inode(oldfid, old_dentry->d_inode);
1386 v9fs_invalidate_inode_attr(dir);
1387 }
1388clunk_fid:
1389 p9_client_clunk(oldfid);
1390 return retval;
1391}
1392
1393/**
1394 * v9fs_vfs_mknod - create a special file
1395 * @dir: inode destination for new link
1396 * @dentry: dentry for file
1397 * @mode: mode for creation
1398 * @rdev: device associated with special file
1399 *
1400 */
1401
1402static int
1403v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1404{
1405 int retval;
1406 char *name;
1407
1408 P9_DPRINTK(P9_DEBUG_VFS,
1409 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1410 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1411
1412 if (!new_valid_dev(rdev))
1413 return -EINVAL;
1414
1415 name = __getname();
1416 if (!name)
1417 return -ENOMEM;
1418 /* build extension */
1419 if (S_ISBLK(mode))
1420 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1421 else if (S_ISCHR(mode))
1422 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1423 else if (S_ISFIFO(mode))
1424 *name = 0;
1425 else if (S_ISSOCK(mode))
1426 *name = 0;
1427 else {
1428 __putname(name);
1429 return -EINVAL;
1430 }
1431
1432 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1433 __putname(name);
1434
1435 return retval;
1436}
1437
1438int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1439{
1440 int umode;
1441 dev_t rdev;
1442 loff_t i_size;
1443 struct p9_wstat *st;
1444 struct v9fs_session_info *v9ses;
1445
1446 v9ses = v9fs_inode2v9ses(inode);
1447 st = p9_client_stat(fid);
1448 if (IS_ERR(st))
1449 return PTR_ERR(st);
1450 /*
1451 * Don't update inode if the file type is different
1452 */
1453 umode = p9mode2unixmode(v9ses, st, &rdev);
1454 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
1455 goto out;
1456
1457 spin_lock(&inode->i_lock);
1458 /*
1459 * We don't want to refresh inode->i_size,
1460 * because we may have cached data
1461 */
1462 i_size = inode->i_size;
1463 v9fs_stat2inode(st, inode, inode->i_sb);
1464 if (v9ses->cache)
1465 inode->i_size = i_size;
1466 spin_unlock(&inode->i_lock);
1467out:
1468 p9stat_free(st);
1469 kfree(st);
1470 return 0;
1471}
1472
1473static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1474 .create = v9fs_vfs_create,
1475 .lookup = v9fs_vfs_lookup,
1476 .symlink = v9fs_vfs_symlink,
1477 .link = v9fs_vfs_link,
1478 .unlink = v9fs_vfs_unlink,
1479 .mkdir = v9fs_vfs_mkdir,
1480 .rmdir = v9fs_vfs_rmdir,
1481 .mknod = v9fs_vfs_mknod,
1482 .rename = v9fs_vfs_rename,
1483 .getattr = v9fs_vfs_getattr,
1484 .setattr = v9fs_vfs_setattr,
1485};
1486
1487static const struct inode_operations v9fs_dir_inode_operations = {
1488 .create = v9fs_vfs_create,
1489 .lookup = v9fs_vfs_lookup,
1490 .unlink = v9fs_vfs_unlink,
1491 .mkdir = v9fs_vfs_mkdir,
1492 .rmdir = v9fs_vfs_rmdir,
1493 .mknod = v9fs_vfs_mknod,
1494 .rename = v9fs_vfs_rename,
1495 .getattr = v9fs_vfs_getattr,
1496 .setattr = v9fs_vfs_setattr,
1497};
1498
1499static const struct inode_operations v9fs_file_inode_operations = {
1500 .getattr = v9fs_vfs_getattr,
1501 .setattr = v9fs_vfs_setattr,
1502};
1503
1504static const struct inode_operations v9fs_symlink_inode_operations = {
1505 .readlink = generic_readlink,
1506 .follow_link = v9fs_vfs_follow_link,
1507 .put_link = v9fs_vfs_put_link,
1508 .getattr = v9fs_vfs_getattr,
1509 .setattr = v9fs_vfs_setattr,
1510};
1511
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(v9fs_inode_cache, 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(&v9inode->netfs, &v9fs_req_ops, 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(&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, &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, st, &rdev);
374 /* don't match inode of different type */
375 if (inode_wrong_type(inode, 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(&v9inode->qid, &st->qid, 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, v9fs_set_inode, st);
423 if (!inode)
424 return ERR_PTR(-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, st, &rdev);
434 retval = v9fs_init_inode(v9ses, inode, umode, rdev);
435 if (retval)
436 goto error;
437
438 v9fs_stat2inode(st, inode, sb, 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(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(st))
458 return ERR_CAST(st);
459
460 inode = v9fs_qid_iget(sb, &st->qid, st, new);
461 p9stat_free(st);
462 kfree(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(dir);
518 inode = d_inode(dentry);
519 dfid = v9fs_parent_fid(dentry);
520 if (IS_ERR(dfid)) {
521 retval = PTR_ERR(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, dentry->d_name.name,
527 v9fs_at_to_dotl_flags(flags));
528 p9_fid_put(dfid);
529 if (retval == -EOPNOTSUPP) {
530 /* Try the one based on path */
531 v9fid = v9fs_fid_clone(dentry);
532 if (IS_ERR(v9fid))
533 return PTR_ERR(v9fid);
534 retval = p9_client_remove(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(dir);
544 } else
545 v9fs_dec_count(inode);
546
547 v9fs_invalidate_inode_attr(inode);
548 v9fs_invalidate_inode_attr(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(dfid)) {
581 err = PTR_ERR(dfid);
582 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
583 return ERR_PTR(err);
584 }
585
586 /* clone a fid to use for creation */
587 ofid = clone_fid(dfid);
588 if (IS_ERR(ofid)) {
589 err = PTR_ERR(ofid);
590 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
591 goto error;
592 }
593
594 err = p9_client_fcreate(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(dfid, 1, &name, 1);
603 if (IS_ERR(fid)) {
604 err = PTR_ERR(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, dir->i_sb);
613 if (IS_ERR(inode)) {
614 err = PTR_ERR(inode);
615 p9_debug(P9_DEBUG_VFS,
616 "inode creation failed %d\n", err);
617 goto error;
618 }
619 v9fs_fid_add(dentry, &fid);
620 d_instantiate(dentry, inode);
621 }
622 p9_fid_put(dfid);
623 return ofid;
624error:
625 p9_fid_put(dfid);
626 p9_fid_put(ofid);
627 p9_fid_put(fid);
628 return ERR_PTR(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(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, P9_ORDWR);
654 if (IS_ERR(fid))
655 return PTR_ERR(fid);
656
657 v9fs_invalidate_inode_attr(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 int 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(dir);
683 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
684 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
685 if (IS_ERR(fid)) {
686 err = PTR_ERR(fid);
687 fid = NULL;
688 } else {
689 inc_nlink(dir);
690 v9fs_invalidate_inode_attr(dir);
691 }
692
693 if (fid)
694 p9_fid_put(fid);
695
696 return err;
697}
698
699/**
700 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
701 * @dir: inode that is being walked from
702 * @dentry: dentry that is being walked to?
703 * @flags: lookup flags (unused)
704 *
705 */
706
707struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
708 unsigned int flags)
709{
710 struct dentry *res;
711 struct v9fs_session_info *v9ses;
712 struct p9_fid *dfid, *fid;
713 struct inode *inode;
714 const unsigned char *name;
715
716 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n",
717 dir, dentry, dentry, flags);
718
719 if (dentry->d_name.len > NAME_MAX)
720 return ERR_PTR(-ENAMETOOLONG);
721
722 v9ses = v9fs_inode2v9ses(dir);
723 /* We can walk d_parent because we hold the dir->i_mutex */
724 dfid = v9fs_parent_fid(dentry);
725 if (IS_ERR(dfid))
726 return ERR_CAST(dfid);
727
728 /*
729 * Make sure we don't use a wrong inode due to parallel
730 * unlink. For cached mode create calls request for new
731 * inode. But with cache disabled, lookup should do this.
732 */
733 name = dentry->d_name.name;
734 fid = p9_client_walk(dfid, 1, &name, 1);
735 p9_fid_put(dfid);
736 if (fid == ERR_PTR(-ENOENT))
737 inode = NULL;
738 else if (IS_ERR(fid))
739 inode = ERR_CAST(fid);
740 else if (v9ses->cache & (CACHE_META|CACHE_LOOSE))
741 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
742 else
743 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
744 /*
745 * If we had a rename on the server and a parallel lookup
746 * for the new name, then make sure we instantiate with
747 * the new name. ie look up for a/b, while on server somebody
748 * moved b under k and client parallely did a lookup for
749 * k/b.
750 */
751 res = d_splice_alias(inode, dentry);
752 if (!IS_ERR(fid)) {
753 if (!res)
754 v9fs_fid_add(dentry, &fid);
755 else if (!IS_ERR(res))
756 v9fs_fid_add(res, &fid);
757 else
758 p9_fid_put(fid);
759 }
760 return res;
761}
762
763static int
764v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
765 struct file *file, unsigned int flags, umode_t mode)
766{
767 int err;
768 u32 perm;
769 struct v9fs_inode __maybe_unused *v9inode;
770 struct v9fs_session_info *v9ses;
771 struct p9_fid *fid;
772 struct dentry *res = NULL;
773 struct inode *inode;
774 int p9_omode;
775
776 if (d_in_lookup(dentry)) {
777 res = v9fs_vfs_lookup(dir, dentry, 0);
778 if (IS_ERR(res))
779 return PTR_ERR(res);
780
781 if (res)
782 dentry = res;
783 }
784
785 /* Only creates */
786 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
787 return finish_no_open(file, res);
788
789 v9ses = v9fs_inode2v9ses(dir);
790 perm = unixmode2p9mode(v9ses, mode);
791 p9_omode = v9fs_uflags2omode(flags, v9fs_proto_dotu(v9ses));
792
793 if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) {
794 p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR;
795 p9_debug(P9_DEBUG_CACHE,
796 "write-only file with writeback enabled, creating w/ O_RDWR\n");
797 }
798 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, p9_omode);
799 if (IS_ERR(fid)) {
800 err = PTR_ERR(fid);
801 goto error;
802 }
803
804 v9fs_invalidate_inode_attr(dir);
805 inode = d_inode(dentry);
806 v9inode = V9FS_I(inode);
807 err = finish_open(file, dentry, generic_file_open);
808 if (err)
809 goto error;
810
811 file->private_data = fid;
812#ifdef CONFIG_9P_FSCACHE
813 if (v9ses->cache & CACHE_FSCACHE)
814 fscache_use_cookie(v9fs_inode_cookie(v9inode),
815 file->f_mode & FMODE_WRITE);
816#endif
817
818 v9fs_fid_add_modes(fid, v9ses->flags, v9ses->cache, file->f_flags);
819 v9fs_open_fid_add(inode, &fid);
820
821 file->f_mode |= FMODE_CREATED;
822out:
823 dput(res);
824 return err;
825
826error:
827 p9_fid_put(fid);
828 goto out;
829}
830
831/**
832 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
833 * @i: inode that is being unlinked
834 * @d: dentry that is being unlinked
835 *
836 */
837
838int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
839{
840 return v9fs_remove(i, d, 0);
841}
842
843/**
844 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
845 * @i: inode that is being unlinked
846 * @d: dentry that is being unlinked
847 *
848 */
849
850int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
851{
852 return v9fs_remove(i, d, AT_REMOVEDIR);
853}
854
855/**
856 * v9fs_vfs_rename - VFS hook to rename an inode
857 * @idmap: The idmap of the mount
858 * @old_dir: old dir inode
859 * @old_dentry: old dentry
860 * @new_dir: new dir inode
861 * @new_dentry: new dentry
862 * @flags: RENAME_* flags
863 *
864 */
865
866int
867v9fs_vfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
868 struct dentry *old_dentry, struct inode *new_dir,
869 struct dentry *new_dentry, unsigned int flags)
870{
871 int retval;
872 struct inode *old_inode;
873 struct inode *new_inode;
874 struct v9fs_session_info *v9ses;
875 struct p9_fid *oldfid = NULL, *dfid = NULL;
876 struct p9_fid *olddirfid = NULL;
877 struct p9_fid *newdirfid = NULL;
878 struct p9_wstat wstat;
879
880 if (flags)
881 return -EINVAL;
882
883 p9_debug(P9_DEBUG_VFS, "\n");
884 old_inode = d_inode(old_dentry);
885 new_inode = d_inode(new_dentry);
886 v9ses = v9fs_inode2v9ses(old_inode);
887 oldfid = v9fs_fid_lookup(old_dentry);
888 if (IS_ERR(oldfid))
889 return PTR_ERR(oldfid);
890
891 dfid = v9fs_parent_fid(old_dentry);
892 olddirfid = clone_fid(dfid);
893 p9_fid_put(dfid);
894 dfid = NULL;
895
896 if (IS_ERR(olddirfid)) {
897 retval = PTR_ERR(olddirfid);
898 goto error;
899 }
900
901 dfid = v9fs_parent_fid(new_dentry);
902 newdirfid = clone_fid(dfid);
903 p9_fid_put(dfid);
904 dfid = NULL;
905
906 if (IS_ERR(newdirfid)) {
907 retval = PTR_ERR(newdirfid);
908 goto error;
909 }
910
911 down_write(&v9ses->rename_sem);
912 if (v9fs_proto_dotl(v9ses)) {
913 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
914 newdirfid, new_dentry->d_name.name);
915 if (retval == -EOPNOTSUPP)
916 retval = p9_client_rename(oldfid, newdirfid,
917 new_dentry->d_name.name);
918 if (retval != -EOPNOTSUPP)
919 goto error_locked;
920 }
921 if (old_dentry->d_parent != new_dentry->d_parent) {
922 /*
923 * 9P .u can only handle file rename in the same directory
924 */
925
926 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
927 retval = -EXDEV;
928 goto error_locked;
929 }
930 v9fs_blank_wstat(&wstat);
931 wstat.muid = v9ses->uname;
932 wstat.name = new_dentry->d_name.name;
933 retval = p9_client_wstat(oldfid, &wstat);
934
935error_locked:
936 if (!retval) {
937 if (new_inode) {
938 if (S_ISDIR(new_inode->i_mode))
939 clear_nlink(new_inode);
940 else
941 v9fs_dec_count(new_inode);
942 }
943 if (S_ISDIR(old_inode->i_mode)) {
944 if (!new_inode)
945 inc_nlink(new_dir);
946 v9fs_dec_count(old_dir);
947 }
948 v9fs_invalidate_inode_attr(old_inode);
949 v9fs_invalidate_inode_attr(old_dir);
950 v9fs_invalidate_inode_attr(new_dir);
951
952 /* successful rename */
953 d_move(old_dentry, new_dentry);
954 }
955 up_write(&v9ses->rename_sem);
956
957error:
958 p9_fid_put(newdirfid);
959 p9_fid_put(olddirfid);
960 p9_fid_put(oldfid);
961 return retval;
962}
963
964/**
965 * v9fs_vfs_getattr - retrieve file metadata
966 * @idmap: idmap of the mount
967 * @path: Object to query
968 * @stat: metadata structure to populate
969 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
970 * @flags: AT_STATX_xxx setting
971 *
972 */
973
974static int
975v9fs_vfs_getattr(struct mnt_idmap *idmap, const struct path *path,
976 struct kstat *stat, u32 request_mask, unsigned int flags)
977{
978 struct dentry *dentry = path->dentry;
979 struct inode *inode = d_inode(dentry);
980 struct v9fs_session_info *v9ses;
981 struct p9_fid *fid;
982 struct p9_wstat *st;
983
984 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
985 v9ses = v9fs_dentry2v9ses(dentry);
986 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
987 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
988 return 0;
989 } else if (v9ses->cache & CACHE_WRITEBACK) {
990 if (S_ISREG(inode->i_mode)) {
991 int retval = filemap_fdatawrite(inode->i_mapping);
992
993 if (retval)
994 p9_debug(P9_DEBUG_ERROR,
995 "flushing writeback during getattr returned %d\n", retval);
996 }
997 }
998 fid = v9fs_fid_lookup(dentry);
999 if (IS_ERR(fid))
1000 return PTR_ERR(fid);
1001
1002 st = p9_client_stat(fid);
1003 p9_fid_put(fid);
1004 if (IS_ERR(st))
1005 return PTR_ERR(st);
1006
1007 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0);
1008 generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat);
1009
1010 p9stat_free(st);
1011 kfree(st);
1012 return 0;
1013}
1014
1015/**
1016 * v9fs_vfs_setattr - set file metadata
1017 * @idmap: idmap of the mount
1018 * @dentry: file whose metadata to set
1019 * @iattr: metadata assignment structure
1020 *
1021 */
1022
1023static int v9fs_vfs_setattr(struct mnt_idmap *idmap,
1024 struct dentry *dentry, struct iattr *iattr)
1025{
1026 int retval, use_dentry = 0;
1027 struct inode *inode = d_inode(dentry);
1028 struct v9fs_session_info *v9ses;
1029 struct p9_fid *fid = NULL;
1030 struct p9_wstat wstat;
1031
1032 p9_debug(P9_DEBUG_VFS, "\n");
1033 retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
1034 if (retval)
1035 return retval;
1036
1037 v9ses = v9fs_dentry2v9ses(dentry);
1038 if (iattr->ia_valid & ATTR_FILE) {
1039 fid = iattr->ia_file->private_data;
1040 WARN_ON(!fid);
1041 }
1042 if (!fid) {
1043 fid = v9fs_fid_lookup(dentry);
1044 use_dentry = 1;
1045 }
1046 if (IS_ERR(fid))
1047 return PTR_ERR(fid);
1048
1049 v9fs_blank_wstat(&wstat);
1050 if (iattr->ia_valid & ATTR_MODE)
1051 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1052
1053 if (iattr->ia_valid & ATTR_MTIME)
1054 wstat.mtime = iattr->ia_mtime.tv_sec;
1055
1056 if (iattr->ia_valid & ATTR_ATIME)
1057 wstat.atime = iattr->ia_atime.tv_sec;
1058
1059 if (iattr->ia_valid & ATTR_SIZE)
1060 wstat.length = iattr->ia_size;
1061
1062 if (v9fs_proto_dotu(v9ses)) {
1063 if (iattr->ia_valid & ATTR_UID)
1064 wstat.n_uid = iattr->ia_uid;
1065
1066 if (iattr->ia_valid & ATTR_GID)
1067 wstat.n_gid = iattr->ia_gid;
1068 }
1069
1070 /* Write all dirty data */
1071 if (d_is_reg(dentry)) {
1072 retval = filemap_fdatawrite(inode->i_mapping);
1073 if (retval)
1074 p9_debug(P9_DEBUG_ERROR,
1075 "flushing writeback during setattr returned %d\n", retval);
1076 }
1077
1078 retval = p9_client_wstat(fid, &wstat);
1079
1080 if (use_dentry)
1081 p9_fid_put(fid);
1082
1083 if (retval < 0)
1084 return retval;
1085
1086 if ((iattr->ia_valid & ATTR_SIZE) &&
1087 iattr->ia_size != i_size_read(inode)) {
1088 truncate_setsize(inode, iattr->ia_size);
1089 netfs_resize_file(netfs_inode(inode), iattr->ia_size, true);
1090
1091#ifdef CONFIG_9P_FSCACHE
1092 if (v9ses->cache & CACHE_FSCACHE) {
1093 struct v9fs_inode *v9inode = V9FS_I(inode);
1094
1095 fscache_resize_cookie(v9fs_inode_cookie(v9inode), iattr->ia_size);
1096 }
1097#endif
1098 }
1099
1100 v9fs_invalidate_inode_attr(inode);
1101
1102 setattr_copy(&nop_mnt_idmap, inode, iattr);
1103 mark_inode_dirty(inode);
1104 return 0;
1105}
1106
1107/**
1108 * v9fs_stat2inode - populate an inode structure with mistat info
1109 * @stat: Plan 9 metadata (mistat) structure
1110 * @inode: inode to populate
1111 * @sb: superblock of filesystem
1112 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
1113 *
1114 */
1115
1116void
1117v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1118 struct super_block *sb, unsigned int flags)
1119{
1120 umode_t mode;
1121 struct v9fs_session_info *v9ses = sb->s_fs_info;
1122 struct v9fs_inode *v9inode = V9FS_I(inode);
1123
1124 inode_set_atime(inode, stat->atime, 0);
1125 inode_set_mtime(inode, stat->mtime, 0);
1126 inode_set_ctime(inode, stat->mtime, 0);
1127
1128 inode->i_uid = v9ses->dfltuid;
1129 inode->i_gid = v9ses->dfltgid;
1130
1131 if (v9fs_proto_dotu(v9ses)) {
1132 inode->i_uid = stat->n_uid;
1133 inode->i_gid = stat->n_gid;
1134 }
1135 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1136 if (v9fs_proto_dotu(v9ses)) {
1137 unsigned int i_nlink;
1138 /*
1139 * Hadlink support got added later to the .u extension.
1140 * So there can be a server out there that doesn't
1141 * support this even with .u extension. That would
1142 * just leave us with stat->extension being an empty
1143 * string, though.
1144 */
1145 /* HARDLINKCOUNT %u */
1146 if (sscanf(stat->extension,
1147 " HARDLINKCOUNT %u", &i_nlink) == 1)
1148 set_nlink(inode, i_nlink);
1149 }
1150 }
1151 mode = p9mode2perm(v9ses, stat);
1152 mode |= inode->i_mode & ~S_IALLUGO;
1153 inode->i_mode = mode;
1154
1155 v9inode->netfs.remote_i_size = stat->length;
1156 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
1157 v9fs_i_size_write(inode, stat->length);
1158 /* not real number of blocks, but 512 byte ones ... */
1159 inode->i_blocks = (stat->length + 512 - 1) >> 9;
1160 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1161}
1162
1163/**
1164 * v9fs_vfs_get_link - follow a symlink path
1165 * @dentry: dentry for symlink
1166 * @inode: inode for symlink
1167 * @done: delayed call for when we are done with the return value
1168 */
1169
1170static const char *v9fs_vfs_get_link(struct dentry *dentry,
1171 struct inode *inode,
1172 struct delayed_call *done)
1173{
1174 struct v9fs_session_info *v9ses;
1175 struct p9_fid *fid;
1176 struct p9_wstat *st;
1177 char *res;
1178
1179 if (!dentry)
1180 return ERR_PTR(-ECHILD);
1181
1182 v9ses = v9fs_dentry2v9ses(dentry);
1183 if (!v9fs_proto_dotu(v9ses))
1184 return ERR_PTR(-EBADF);
1185
1186 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
1187 fid = v9fs_fid_lookup(dentry);
1188
1189 if (IS_ERR(fid))
1190 return ERR_CAST(fid);
1191
1192 st = p9_client_stat(fid);
1193 p9_fid_put(fid);
1194 if (IS_ERR(st))
1195 return ERR_CAST(st);
1196
1197 if (!(st->mode & P9_DMSYMLINK)) {
1198 p9stat_free(st);
1199 kfree(st);
1200 return ERR_PTR(-EINVAL);
1201 }
1202 res = st->extension;
1203 st->extension = NULL;
1204 if (strlen(res) >= PATH_MAX)
1205 res[PATH_MAX - 1] = '\0';
1206
1207 p9stat_free(st);
1208 kfree(st);
1209 set_delayed_call(done, kfree_link, res);
1210 return res;
1211}
1212
1213/**
1214 * v9fs_vfs_mkspecial - create a special file
1215 * @dir: inode to create special file in
1216 * @dentry: dentry to create
1217 * @perm: mode to create special file
1218 * @extension: 9p2000.u format extension string representing special file
1219 *
1220 */
1221
1222static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1223 u32 perm, const char *extension)
1224{
1225 struct p9_fid *fid;
1226 struct v9fs_session_info *v9ses;
1227
1228 v9ses = v9fs_inode2v9ses(dir);
1229 if (!v9fs_proto_dotu(v9ses)) {
1230 p9_debug(P9_DEBUG_ERROR, "not extended\n");
1231 return -EPERM;
1232 }
1233
1234 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1235 P9_OREAD);
1236 if (IS_ERR(fid))
1237 return PTR_ERR(fid);
1238
1239 v9fs_invalidate_inode_attr(dir);
1240 p9_fid_put(fid);
1241 return 0;
1242}
1243
1244/**
1245 * v9fs_vfs_symlink - helper function to create symlinks
1246 * @idmap: idmap of the mount
1247 * @dir: directory inode containing symlink
1248 * @dentry: dentry for symlink
1249 * @symname: symlink data
1250 *
1251 * See Also: 9P2000.u RFC for more information
1252 *
1253 */
1254
1255static int
1256v9fs_vfs_symlink(struct mnt_idmap *idmap, struct inode *dir,
1257 struct dentry *dentry, const char *symname)
1258{
1259 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n",
1260 dir->i_ino, dentry, symname);
1261
1262 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname);
1263}
1264
1265#define U32_MAX_DIGITS 10
1266
1267/**
1268 * v9fs_vfs_link - create a hardlink
1269 * @old_dentry: dentry for file to link to
1270 * @dir: inode destination for new link
1271 * @dentry: dentry for link
1272 *
1273 */
1274
1275static int
1276v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1277 struct dentry *dentry)
1278{
1279 int retval;
1280 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */
1281 struct p9_fid *oldfid;
1282
1283 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n",
1284 dir->i_ino, dentry, old_dentry);
1285
1286 oldfid = v9fs_fid_clone(old_dentry);
1287 if (IS_ERR(oldfid))
1288 return PTR_ERR(oldfid);
1289
1290 sprintf(name, "%d\n", oldfid->fid);
1291 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1292 if (!retval) {
1293 v9fs_refresh_inode(oldfid, d_inode(old_dentry));
1294 v9fs_invalidate_inode_attr(dir);
1295 }
1296 p9_fid_put(oldfid);
1297 return retval;
1298}
1299
1300/**
1301 * v9fs_vfs_mknod - create a special file
1302 * @idmap: idmap of the mount
1303 * @dir: inode destination for new link
1304 * @dentry: dentry for file
1305 * @mode: mode for creation
1306 * @rdev: device associated with special file
1307 *
1308 */
1309
1310static int
1311v9fs_vfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
1312 struct dentry *dentry, umode_t mode, dev_t rdev)
1313{
1314 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1315 int retval;
1316 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1];
1317 u32 perm;
1318
1319 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
1320 dir->i_ino, dentry, mode,
1321 MAJOR(rdev), MINOR(rdev));
1322
1323 /* build extension */
1324 if (S_ISBLK(mode))
1325 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1326 else if (S_ISCHR(mode))
1327 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1328 else
1329 *name = 0;
1330
1331 perm = unixmode2p9mode(v9ses, mode);
1332 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name);
1333
1334 return retval;
1335}
1336
1337int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1338{
1339 int umode;
1340 dev_t rdev;
1341 struct p9_wstat *st;
1342 struct v9fs_session_info *v9ses;
1343 unsigned int flags;
1344
1345 v9ses = v9fs_inode2v9ses(inode);
1346 st = p9_client_stat(fid);
1347 if (IS_ERR(st))
1348 return PTR_ERR(st);
1349 /*
1350 * Don't update inode if the file type is different
1351 */
1352 umode = p9mode2unixmode(v9ses, st, &rdev);
1353 if (inode_wrong_type(inode, umode))
1354 goto out;
1355
1356 /*
1357 * We don't want to refresh inode->i_size,
1358 * because we may have cached data
1359 */
1360 flags = (v9ses->cache & CACHE_LOOSE) ?
1361 V9FS_STAT2INODE_KEEP_ISIZE : 0;
1362 v9fs_stat2inode(st, inode, inode->i_sb, flags);
1363out:
1364 p9stat_free(st);
1365 kfree(st);
1366 return 0;
1367}
1368
1369static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1370 .create = v9fs_vfs_create,
1371 .lookup = v9fs_vfs_lookup,
1372 .atomic_open = v9fs_vfs_atomic_open,
1373 .symlink = v9fs_vfs_symlink,
1374 .link = v9fs_vfs_link,
1375 .unlink = v9fs_vfs_unlink,
1376 .mkdir = v9fs_vfs_mkdir,
1377 .rmdir = v9fs_vfs_rmdir,
1378 .mknod = v9fs_vfs_mknod,
1379 .rename = v9fs_vfs_rename,
1380 .getattr = v9fs_vfs_getattr,
1381 .setattr = v9fs_vfs_setattr,
1382};
1383
1384static const struct inode_operations v9fs_dir_inode_operations = {
1385 .create = v9fs_vfs_create,
1386 .lookup = v9fs_vfs_lookup,
1387 .atomic_open = v9fs_vfs_atomic_open,
1388 .unlink = v9fs_vfs_unlink,
1389 .mkdir = v9fs_vfs_mkdir,
1390 .rmdir = v9fs_vfs_rmdir,
1391 .mknod = v9fs_vfs_mknod,
1392 .rename = v9fs_vfs_rename,
1393 .getattr = v9fs_vfs_getattr,
1394 .setattr = v9fs_vfs_setattr,
1395};
1396
1397static const struct inode_operations v9fs_file_inode_operations = {
1398 .getattr = v9fs_vfs_getattr,
1399 .setattr = v9fs_vfs_setattr,
1400};
1401
1402static const struct inode_operations v9fs_symlink_inode_operations = {
1403 .get_link = v9fs_vfs_get_link,
1404 .getattr = v9fs_vfs_getattr,
1405 .setattr = v9fs_vfs_setattr,
1406};
1407