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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
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27
28#include <linux/module.h>
29#include <linux/errno.h>
30#include <linux/fs.h>
31#include <linux/file.h>
32#include <linux/pagemap.h>
33#include <linux/stat.h>
34#include <linux/string.h>
35#include <linux/inet.h>
36#include <linux/namei.h>
37#include <linux/idr.h>
38#include <linux/sched.h>
39#include <linux/slab.h>
40#include <linux/xattr.h>
41#include <linux/posix_acl.h>
42#include <net/9p/9p.h>
43#include <net/9p/client.h>
44
45#include "v9fs.h"
46#include "v9fs_vfs.h"
47#include "fid.h"
48#include "cache.h"
49#include "xattr.h"
50#include "acl.h"
51
52static const struct inode_operations v9fs_dir_inode_operations;
53static const struct inode_operations v9fs_dir_inode_operations_dotu;
54static const struct inode_operations v9fs_file_inode_operations;
55static const struct inode_operations v9fs_symlink_inode_operations;
56
57/**
58 * unixmode2p9mode - convert unix mode bits to plan 9
59 * @v9ses: v9fs session information
60 * @mode: mode to convert
61 *
62 */
63
64static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode)
65{
66 int res;
67 res = mode & 0777;
68 if (S_ISDIR(mode))
69 res |= P9_DMDIR;
70 if (v9fs_proto_dotu(v9ses)) {
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 }
89 return res;
90}
91
92/**
93 * p9mode2perm- convert plan9 mode bits to unix permission bits
94 * @v9ses: v9fs session information
95 * @stat: p9_wstat from which mode need to be derived
96 *
97 */
98static int p9mode2perm(struct v9fs_session_info *v9ses,
99 struct p9_wstat *stat)
100{
101 int res;
102 int mode = stat->mode;
103
104 res = mode & S_IALLUGO;
105 if (v9fs_proto_dotu(v9ses)) {
106 if ((mode & P9_DMSETUID) == P9_DMSETUID)
107 res |= S_ISUID;
108
109 if ((mode & P9_DMSETGID) == P9_DMSETGID)
110 res |= S_ISGID;
111
112 if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
113 res |= S_ISVTX;
114 }
115 return res;
116}
117
118/**
119 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
120 * @v9ses: v9fs session information
121 * @stat: p9_wstat from which mode need to be derived
122 * @rdev: major number, minor number in case of device files.
123 *
124 */
125static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses,
126 struct p9_wstat *stat, dev_t *rdev)
127{
128 int res;
129 u32 mode = stat->mode;
130
131 *rdev = 0;
132 res = p9mode2perm(v9ses, stat);
133
134 if ((mode & P9_DMDIR) == P9_DMDIR)
135 res |= S_IFDIR;
136 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
137 res |= S_IFLNK;
138 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
139 && (v9ses->nodev == 0))
140 res |= S_IFSOCK;
141 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
142 && (v9ses->nodev == 0))
143 res |= S_IFIFO;
144 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
145 && (v9ses->nodev == 0)) {
146 char type = 0, ext[32];
147 int major = -1, minor = -1;
148
149 strlcpy(ext, stat->extension, sizeof(ext));
150 sscanf(ext, "%c %i %i", &type, &major, &minor);
151 switch (type) {
152 case 'c':
153 res |= S_IFCHR;
154 break;
155 case 'b':
156 res |= S_IFBLK;
157 break;
158 default:
159 p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n",
160 type, stat->extension);
161 };
162 *rdev = MKDEV(major, minor);
163 } else
164 res |= S_IFREG;
165
166 return res;
167}
168
169/**
170 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
171 * @uflags: flags to convert
172 * @extended: if .u extensions are active
173 */
174
175int v9fs_uflags2omode(int uflags, int extended)
176{
177 int ret;
178
179 ret = 0;
180 switch (uflags&3) {
181 default:
182 case O_RDONLY:
183 ret = P9_OREAD;
184 break;
185
186 case O_WRONLY:
187 ret = P9_OWRITE;
188 break;
189
190 case O_RDWR:
191 ret = P9_ORDWR;
192 break;
193 }
194
195 if (extended) {
196 if (uflags & O_EXCL)
197 ret |= P9_OEXCL;
198
199 if (uflags & O_APPEND)
200 ret |= P9_OAPPEND;
201 }
202
203 return ret;
204}
205
206/**
207 * v9fs_blank_wstat - helper function to setup a 9P stat structure
208 * @wstat: structure to initialize
209 *
210 */
211
212void
213v9fs_blank_wstat(struct p9_wstat *wstat)
214{
215 wstat->type = ~0;
216 wstat->dev = ~0;
217 wstat->qid.type = ~0;
218 wstat->qid.version = ~0;
219 *((long long *)&wstat->qid.path) = ~0;
220 wstat->mode = ~0;
221 wstat->atime = ~0;
222 wstat->mtime = ~0;
223 wstat->length = ~0;
224 wstat->name = NULL;
225 wstat->uid = NULL;
226 wstat->gid = NULL;
227 wstat->muid = NULL;
228 wstat->n_uid = INVALID_UID;
229 wstat->n_gid = INVALID_GID;
230 wstat->n_muid = INVALID_UID;
231 wstat->extension = NULL;
232}
233
234/**
235 * v9fs_alloc_inode - helper function to allocate an inode
236 *
237 */
238struct inode *v9fs_alloc_inode(struct super_block *sb)
239{
240 struct v9fs_inode *v9inode;
241 v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache,
242 GFP_KERNEL);
243 if (!v9inode)
244 return NULL;
245#ifdef CONFIG_9P_FSCACHE
246 v9inode->fscache = NULL;
247 mutex_init(&v9inode->fscache_lock);
248#endif
249 v9inode->writeback_fid = NULL;
250 v9inode->cache_validity = 0;
251 mutex_init(&v9inode->v_mutex);
252 return &v9inode->vfs_inode;
253}
254
255/**
256 * v9fs_destroy_inode - destroy an inode
257 *
258 */
259
260static void v9fs_i_callback(struct rcu_head *head)
261{
262 struct inode *inode = container_of(head, struct inode, i_rcu);
263 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
264}
265
266void v9fs_destroy_inode(struct inode *inode)
267{
268 call_rcu(&inode->i_rcu, v9fs_i_callback);
269}
270
271int v9fs_init_inode(struct v9fs_session_info *v9ses,
272 struct inode *inode, umode_t mode, dev_t rdev)
273{
274 int err = 0;
275
276 inode_init_owner(inode, NULL, mode);
277 inode->i_blocks = 0;
278 inode->i_rdev = rdev;
279 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
280 inode->i_mapping->a_ops = &v9fs_addr_operations;
281
282 switch (mode & S_IFMT) {
283 case S_IFIFO:
284 case S_IFBLK:
285 case S_IFCHR:
286 case S_IFSOCK:
287 if (v9fs_proto_dotl(v9ses)) {
288 inode->i_op = &v9fs_file_inode_operations_dotl;
289 } else if (v9fs_proto_dotu(v9ses)) {
290 inode->i_op = &v9fs_file_inode_operations;
291 } else {
292 p9_debug(P9_DEBUG_ERROR,
293 "special files without extended mode\n");
294 err = -EINVAL;
295 goto error;
296 }
297 init_special_inode(inode, inode->i_mode, inode->i_rdev);
298 break;
299 case S_IFREG:
300 if (v9fs_proto_dotl(v9ses)) {
301 inode->i_op = &v9fs_file_inode_operations_dotl;
302 if (v9ses->cache == CACHE_LOOSE ||
303 v9ses->cache == CACHE_FSCACHE)
304 inode->i_fop =
305 &v9fs_cached_file_operations_dotl;
306 else if (v9ses->cache == CACHE_MMAP)
307 inode->i_fop = &v9fs_mmap_file_operations_dotl;
308 else
309 inode->i_fop = &v9fs_file_operations_dotl;
310 } else {
311 inode->i_op = &v9fs_file_inode_operations;
312 if (v9ses->cache == CACHE_LOOSE ||
313 v9ses->cache == CACHE_FSCACHE)
314 inode->i_fop =
315 &v9fs_cached_file_operations;
316 else if (v9ses->cache == CACHE_MMAP)
317 inode->i_fop = &v9fs_mmap_file_operations;
318 else
319 inode->i_fop = &v9fs_file_operations;
320 }
321
322 break;
323 case S_IFLNK:
324 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
325 p9_debug(P9_DEBUG_ERROR,
326 "extended modes used with legacy protocol\n");
327 err = -EINVAL;
328 goto error;
329 }
330
331 if (v9fs_proto_dotl(v9ses))
332 inode->i_op = &v9fs_symlink_inode_operations_dotl;
333 else
334 inode->i_op = &v9fs_symlink_inode_operations;
335
336 break;
337 case S_IFDIR:
338 inc_nlink(inode);
339 if (v9fs_proto_dotl(v9ses))
340 inode->i_op = &v9fs_dir_inode_operations_dotl;
341 else if (v9fs_proto_dotu(v9ses))
342 inode->i_op = &v9fs_dir_inode_operations_dotu;
343 else
344 inode->i_op = &v9fs_dir_inode_operations;
345
346 if (v9fs_proto_dotl(v9ses))
347 inode->i_fop = &v9fs_dir_operations_dotl;
348 else
349 inode->i_fop = &v9fs_dir_operations;
350
351 break;
352 default:
353 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n",
354 mode, mode & S_IFMT);
355 err = -EINVAL;
356 goto error;
357 }
358error:
359 return err;
360
361}
362
363/**
364 * v9fs_get_inode - helper function to setup an inode
365 * @sb: superblock
366 * @mode: mode to setup inode with
367 *
368 */
369
370struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev)
371{
372 int err;
373 struct inode *inode;
374 struct v9fs_session_info *v9ses = sb->s_fs_info;
375
376 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode);
377
378 inode = new_inode(sb);
379 if (!inode) {
380 pr_warn("%s (%d): Problem allocating inode\n",
381 __func__, task_pid_nr(current));
382 return ERR_PTR(-ENOMEM);
383 }
384 err = v9fs_init_inode(v9ses, inode, mode, rdev);
385 if (err) {
386 iput(inode);
387 return ERR_PTR(err);
388 }
389 return inode;
390}
391
392/*
393static struct v9fs_fid*
394v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
395{
396 int err;
397 int nfid;
398 struct v9fs_fid *ret;
399 struct v9fs_fcall *fcall;
400
401 nfid = v9fs_get_idpool(&v9ses->fidpool);
402 if (nfid < 0) {
403 eprintk(KERN_WARNING, "no free fids available\n");
404 return ERR_PTR(-ENOSPC);
405 }
406
407 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
408 &fcall);
409
410 if (err < 0) {
411 if (fcall && fcall->id == RWALK)
412 goto clunk_fid;
413
414 PRINT_FCALL_ERROR("walk error", fcall);
415 v9fs_put_idpool(nfid, &v9ses->fidpool);
416 goto error;
417 }
418
419 kfree(fcall);
420 fcall = NULL;
421 ret = v9fs_fid_create(v9ses, nfid);
422 if (!ret) {
423 err = -ENOMEM;
424 goto clunk_fid;
425 }
426
427 err = v9fs_fid_insert(ret, dentry);
428 if (err < 0) {
429 v9fs_fid_destroy(ret);
430 goto clunk_fid;
431 }
432
433 return ret;
434
435clunk_fid:
436 v9fs_t_clunk(v9ses, nfid);
437
438error:
439 kfree(fcall);
440 return ERR_PTR(err);
441}
442*/
443
444
445/**
446 * v9fs_clear_inode - release an inode
447 * @inode: inode to release
448 *
449 */
450void v9fs_evict_inode(struct inode *inode)
451{
452 struct v9fs_inode *v9inode = V9FS_I(inode);
453
454 truncate_inode_pages_final(&inode->i_data);
455 clear_inode(inode);
456 filemap_fdatawrite(&inode->i_data);
457
458 v9fs_cache_inode_put_cookie(inode);
459 /* clunk the fid stashed in writeback_fid */
460 if (v9inode->writeback_fid) {
461 p9_client_clunk(v9inode->writeback_fid);
462 v9inode->writeback_fid = NULL;
463 }
464}
465
466static int v9fs_test_inode(struct inode *inode, void *data)
467{
468 int umode;
469 dev_t rdev;
470 struct v9fs_inode *v9inode = V9FS_I(inode);
471 struct p9_wstat *st = (struct p9_wstat *)data;
472 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
473
474 umode = p9mode2unixmode(v9ses, st, &rdev);
475 /* don't match inode of different type */
476 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
477 return 0;
478
479 /* compare qid details */
480 if (memcmp(&v9inode->qid.version,
481 &st->qid.version, sizeof(v9inode->qid.version)))
482 return 0;
483
484 if (v9inode->qid.type != st->qid.type)
485 return 0;
486
487 if (v9inode->qid.path != st->qid.path)
488 return 0;
489 return 1;
490}
491
492static int v9fs_test_new_inode(struct inode *inode, void *data)
493{
494 return 0;
495}
496
497static int v9fs_set_inode(struct inode *inode, void *data)
498{
499 struct v9fs_inode *v9inode = V9FS_I(inode);
500 struct p9_wstat *st = (struct p9_wstat *)data;
501
502 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
503 return 0;
504}
505
506static struct inode *v9fs_qid_iget(struct super_block *sb,
507 struct p9_qid *qid,
508 struct p9_wstat *st,
509 int new)
510{
511 dev_t rdev;
512 int retval;
513 umode_t umode;
514 unsigned long i_ino;
515 struct inode *inode;
516 struct v9fs_session_info *v9ses = sb->s_fs_info;
517 int (*test)(struct inode *, void *);
518
519 if (new)
520 test = v9fs_test_new_inode;
521 else
522 test = v9fs_test_inode;
523
524 i_ino = v9fs_qid2ino(qid);
525 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
526 if (!inode)
527 return ERR_PTR(-ENOMEM);
528 if (!(inode->i_state & I_NEW))
529 return inode;
530 /*
531 * initialize the inode with the stat info
532 * FIXME!! we may need support for stale inodes
533 * later.
534 */
535 inode->i_ino = i_ino;
536 umode = p9mode2unixmode(v9ses, st, &rdev);
537 retval = v9fs_init_inode(v9ses, inode, umode, rdev);
538 if (retval)
539 goto error;
540
541 v9fs_stat2inode(st, inode, sb);
542 v9fs_cache_inode_get_cookie(inode);
543 unlock_new_inode(inode);
544 return inode;
545error:
546 iget_failed(inode);
547 return ERR_PTR(retval);
548
549}
550
551struct inode *
552v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
553 struct super_block *sb, int new)
554{
555 struct p9_wstat *st;
556 struct inode *inode = NULL;
557
558 st = p9_client_stat(fid);
559 if (IS_ERR(st))
560 return ERR_CAST(st);
561
562 inode = v9fs_qid_iget(sb, &st->qid, st, new);
563 p9stat_free(st);
564 kfree(st);
565 return inode;
566}
567
568/**
569 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
570 * plan 9 AT flag.
571 * @flags: flags to convert
572 */
573static int v9fs_at_to_dotl_flags(int flags)
574{
575 int rflags = 0;
576 if (flags & AT_REMOVEDIR)
577 rflags |= P9_DOTL_AT_REMOVEDIR;
578 return rflags;
579}
580
581/**
582 * v9fs_dec_count - helper functon to drop i_nlink.
583 *
584 * If a directory had nlink <= 2 (including . and ..), then we should not drop
585 * the link count, which indicates the underlying exported fs doesn't maintain
586 * nlink accurately. e.g.
587 * - overlayfs sets nlink to 1 for merged dir
588 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more
589 * than EXT4_LINK_MAX (65000) links.
590 *
591 * @inode: inode whose nlink is being dropped
592 */
593static void v9fs_dec_count(struct inode *inode)
594{
595 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2)
596 drop_nlink(inode);
597}
598
599/**
600 * v9fs_remove - helper function to remove files and directories
601 * @dir: directory inode that is being deleted
602 * @dentry: dentry that is being deleted
603 * @flags: removing a directory
604 *
605 */
606
607static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
608{
609 struct inode *inode;
610 int retval = -EOPNOTSUPP;
611 struct p9_fid *v9fid, *dfid;
612 struct v9fs_session_info *v9ses;
613
614 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
615 dir, dentry, flags);
616
617 v9ses = v9fs_inode2v9ses(dir);
618 inode = d_inode(dentry);
619 dfid = v9fs_parent_fid(dentry);
620 if (IS_ERR(dfid)) {
621 retval = PTR_ERR(dfid);
622 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
623 return retval;
624 }
625 if (v9fs_proto_dotl(v9ses))
626 retval = p9_client_unlinkat(dfid, dentry->d_name.name,
627 v9fs_at_to_dotl_flags(flags));
628 if (retval == -EOPNOTSUPP) {
629 /* Try the one based on path */
630 v9fid = v9fs_fid_clone(dentry);
631 if (IS_ERR(v9fid))
632 return PTR_ERR(v9fid);
633 retval = p9_client_remove(v9fid);
634 }
635 if (!retval) {
636 /*
637 * directories on unlink should have zero
638 * link count
639 */
640 if (flags & AT_REMOVEDIR) {
641 clear_nlink(inode);
642 v9fs_dec_count(dir);
643 } else
644 v9fs_dec_count(inode);
645
646 v9fs_invalidate_inode_attr(inode);
647 v9fs_invalidate_inode_attr(dir);
648 }
649 return retval;
650}
651
652/**
653 * v9fs_create - Create a file
654 * @v9ses: session information
655 * @dir: directory that dentry is being created in
656 * @dentry: dentry that is being created
657 * @extension: 9p2000.u extension string to support devices, etc.
658 * @perm: create permissions
659 * @mode: open mode
660 *
661 */
662static struct p9_fid *
663v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
664 struct dentry *dentry, char *extension, u32 perm, u8 mode)
665{
666 int err;
667 const unsigned char *name;
668 struct p9_fid *dfid, *ofid, *fid;
669 struct inode *inode;
670
671 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
672
673 err = 0;
674 ofid = NULL;
675 fid = NULL;
676 name = dentry->d_name.name;
677 dfid = v9fs_parent_fid(dentry);
678 if (IS_ERR(dfid)) {
679 err = PTR_ERR(dfid);
680 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
681 return ERR_PTR(err);
682 }
683
684 /* clone a fid to use for creation */
685 ofid = clone_fid(dfid);
686 if (IS_ERR(ofid)) {
687 err = PTR_ERR(ofid);
688 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
689 return ERR_PTR(err);
690 }
691
692 err = p9_client_fcreate(ofid, name, perm, mode, extension);
693 if (err < 0) {
694 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
695 goto error;
696 }
697
698 if (!(perm & P9_DMLINK)) {
699 /* now walk from the parent so we can get unopened fid */
700 fid = p9_client_walk(dfid, 1, &name, 1);
701 if (IS_ERR(fid)) {
702 err = PTR_ERR(fid);
703 p9_debug(P9_DEBUG_VFS,
704 "p9_client_walk failed %d\n", err);
705 fid = NULL;
706 goto error;
707 }
708 /*
709 * instantiate inode and assign the unopened fid to the dentry
710 */
711 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
712 if (IS_ERR(inode)) {
713 err = PTR_ERR(inode);
714 p9_debug(P9_DEBUG_VFS,
715 "inode creation failed %d\n", err);
716 goto error;
717 }
718 v9fs_fid_add(dentry, fid);
719 d_instantiate(dentry, inode);
720 }
721 return ofid;
722error:
723 if (ofid)
724 p9_client_clunk(ofid);
725
726 if (fid)
727 p9_client_clunk(fid);
728
729 return ERR_PTR(err);
730}
731
732/**
733 * v9fs_vfs_create - VFS hook to create a regular file
734 *
735 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called
736 * for mknod(2).
737 *
738 * @dir: directory inode that is being created
739 * @dentry: dentry that is being deleted
740 * @mode: create permissions
741 *
742 */
743
744static int
745v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
746 bool excl)
747{
748 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
749 u32 perm = unixmode2p9mode(v9ses, mode);
750 struct p9_fid *fid;
751
752 /* P9_OEXCL? */
753 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR);
754 if (IS_ERR(fid))
755 return PTR_ERR(fid);
756
757 v9fs_invalidate_inode_attr(dir);
758 p9_client_clunk(fid);
759
760 return 0;
761}
762
763/**
764 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
765 * @dir: inode that is being unlinked
766 * @dentry: dentry that is being unlinked
767 * @mode: mode for new directory
768 *
769 */
770
771static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
772{
773 int err;
774 u32 perm;
775 struct p9_fid *fid;
776 struct v9fs_session_info *v9ses;
777
778 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
779 err = 0;
780 v9ses = v9fs_inode2v9ses(dir);
781 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
782 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
783 if (IS_ERR(fid)) {
784 err = PTR_ERR(fid);
785 fid = NULL;
786 } else {
787 inc_nlink(dir);
788 v9fs_invalidate_inode_attr(dir);
789 }
790
791 if (fid)
792 p9_client_clunk(fid);
793
794 return err;
795}
796
797/**
798 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
799 * @dir: inode that is being walked from
800 * @dentry: dentry that is being walked to?
801 * @flags: lookup flags (unused)
802 *
803 */
804
805struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
806 unsigned int flags)
807{
808 struct dentry *res;
809 struct v9fs_session_info *v9ses;
810 struct p9_fid *dfid, *fid;
811 struct inode *inode;
812 const unsigned char *name;
813
814 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n",
815 dir, dentry, dentry, flags);
816
817 if (dentry->d_name.len > NAME_MAX)
818 return ERR_PTR(-ENAMETOOLONG);
819
820 v9ses = v9fs_inode2v9ses(dir);
821 /* We can walk d_parent because we hold the dir->i_mutex */
822 dfid = v9fs_parent_fid(dentry);
823 if (IS_ERR(dfid))
824 return ERR_CAST(dfid);
825
826 name = dentry->d_name.name;
827 fid = p9_client_walk(dfid, 1, &name, 1);
828 if (IS_ERR(fid)) {
829 if (fid == ERR_PTR(-ENOENT)) {
830 d_add(dentry, NULL);
831 return NULL;
832 }
833 return ERR_CAST(fid);
834 }
835 /*
836 * Make sure we don't use a wrong inode due to parallel
837 * unlink. For cached mode create calls request for new
838 * inode. But with cache disabled, lookup should do this.
839 */
840 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
841 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
842 else
843 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
844 if (IS_ERR(inode)) {
845 p9_client_clunk(fid);
846 return ERR_CAST(inode);
847 }
848 /*
849 * If we had a rename on the server and a parallel lookup
850 * for the new name, then make sure we instantiate with
851 * the new name. ie look up for a/b, while on server somebody
852 * moved b under k and client parallely did a lookup for
853 * k/b.
854 */
855 res = d_splice_alias(inode, dentry);
856 if (!res)
857 v9fs_fid_add(dentry, fid);
858 else if (!IS_ERR(res))
859 v9fs_fid_add(res, fid);
860 else
861 p9_client_clunk(fid);
862 return res;
863}
864
865static int
866v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
867 struct file *file, unsigned flags, umode_t mode,
868 int *opened)
869{
870 int err;
871 u32 perm;
872 struct v9fs_inode *v9inode;
873 struct v9fs_session_info *v9ses;
874 struct p9_fid *fid, *inode_fid;
875 struct dentry *res = NULL;
876
877 if (d_in_lookup(dentry)) {
878 res = v9fs_vfs_lookup(dir, dentry, 0);
879 if (IS_ERR(res))
880 return PTR_ERR(res);
881
882 if (res)
883 dentry = res;
884 }
885
886 /* Only creates */
887 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
888 return finish_no_open(file, res);
889
890 err = 0;
891
892 v9ses = v9fs_inode2v9ses(dir);
893 perm = unixmode2p9mode(v9ses, mode);
894 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
895 v9fs_uflags2omode(flags,
896 v9fs_proto_dotu(v9ses)));
897 if (IS_ERR(fid)) {
898 err = PTR_ERR(fid);
899 fid = NULL;
900 goto error;
901 }
902
903 v9fs_invalidate_inode_attr(dir);
904 v9inode = V9FS_I(d_inode(dentry));
905 mutex_lock(&v9inode->v_mutex);
906 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
907 !v9inode->writeback_fid &&
908 ((flags & O_ACCMODE) != O_RDONLY)) {
909 /*
910 * clone a fid and add it to writeback_fid
911 * we do it during open time instead of
912 * page dirty time via write_begin/page_mkwrite
913 * because we want write after unlink usecase
914 * to work.
915 */
916 inode_fid = v9fs_writeback_fid(dentry);
917 if (IS_ERR(inode_fid)) {
918 err = PTR_ERR(inode_fid);
919 mutex_unlock(&v9inode->v_mutex);
920 goto error;
921 }
922 v9inode->writeback_fid = (void *) inode_fid;
923 }
924 mutex_unlock(&v9inode->v_mutex);
925 err = finish_open(file, dentry, generic_file_open, opened);
926 if (err)
927 goto error;
928
929 file->private_data = fid;
930 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
931 v9fs_cache_inode_set_cookie(d_inode(dentry), file);
932
933 *opened |= FILE_CREATED;
934out:
935 dput(res);
936 return err;
937
938error:
939 if (fid)
940 p9_client_clunk(fid);
941 goto out;
942}
943
944/**
945 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
946 * @i: inode that is being unlinked
947 * @d: dentry that is being unlinked
948 *
949 */
950
951int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
952{
953 return v9fs_remove(i, d, 0);
954}
955
956/**
957 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
958 * @i: inode that is being unlinked
959 * @d: dentry that is being unlinked
960 *
961 */
962
963int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
964{
965 return v9fs_remove(i, d, AT_REMOVEDIR);
966}
967
968/**
969 * v9fs_vfs_rename - VFS hook to rename an inode
970 * @old_dir: old dir inode
971 * @old_dentry: old dentry
972 * @new_dir: new dir inode
973 * @new_dentry: new dentry
974 *
975 */
976
977int
978v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
979 struct inode *new_dir, struct dentry *new_dentry,
980 unsigned int flags)
981{
982 int retval;
983 struct inode *old_inode;
984 struct inode *new_inode;
985 struct v9fs_session_info *v9ses;
986 struct p9_fid *oldfid;
987 struct p9_fid *olddirfid;
988 struct p9_fid *newdirfid;
989 struct p9_wstat wstat;
990
991 if (flags)
992 return -EINVAL;
993
994 p9_debug(P9_DEBUG_VFS, "\n");
995 retval = 0;
996 old_inode = d_inode(old_dentry);
997 new_inode = d_inode(new_dentry);
998 v9ses = v9fs_inode2v9ses(old_inode);
999 oldfid = v9fs_fid_lookup(old_dentry);
1000 if (IS_ERR(oldfid))
1001 return PTR_ERR(oldfid);
1002
1003 olddirfid = clone_fid(v9fs_parent_fid(old_dentry));
1004 if (IS_ERR(olddirfid)) {
1005 retval = PTR_ERR(olddirfid);
1006 goto done;
1007 }
1008
1009 newdirfid = clone_fid(v9fs_parent_fid(new_dentry));
1010 if (IS_ERR(newdirfid)) {
1011 retval = PTR_ERR(newdirfid);
1012 goto clunk_olddir;
1013 }
1014
1015 down_write(&v9ses->rename_sem);
1016 if (v9fs_proto_dotl(v9ses)) {
1017 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
1018 newdirfid, new_dentry->d_name.name);
1019 if (retval == -EOPNOTSUPP)
1020 retval = p9_client_rename(oldfid, newdirfid,
1021 new_dentry->d_name.name);
1022 if (retval != -EOPNOTSUPP)
1023 goto clunk_newdir;
1024 }
1025 if (old_dentry->d_parent != new_dentry->d_parent) {
1026 /*
1027 * 9P .u can only handle file rename in the same directory
1028 */
1029
1030 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
1031 retval = -EXDEV;
1032 goto clunk_newdir;
1033 }
1034 v9fs_blank_wstat(&wstat);
1035 wstat.muid = v9ses->uname;
1036 wstat.name = new_dentry->d_name.name;
1037 retval = p9_client_wstat(oldfid, &wstat);
1038
1039clunk_newdir:
1040 if (!retval) {
1041 if (new_inode) {
1042 if (S_ISDIR(new_inode->i_mode))
1043 clear_nlink(new_inode);
1044 else
1045 v9fs_dec_count(new_inode);
1046 }
1047 if (S_ISDIR(old_inode->i_mode)) {
1048 if (!new_inode)
1049 inc_nlink(new_dir);
1050 v9fs_dec_count(old_dir);
1051 }
1052 v9fs_invalidate_inode_attr(old_inode);
1053 v9fs_invalidate_inode_attr(old_dir);
1054 v9fs_invalidate_inode_attr(new_dir);
1055
1056 /* successful rename */
1057 d_move(old_dentry, new_dentry);
1058 }
1059 up_write(&v9ses->rename_sem);
1060 p9_client_clunk(newdirfid);
1061
1062clunk_olddir:
1063 p9_client_clunk(olddirfid);
1064
1065done:
1066 return retval;
1067}
1068
1069/**
1070 * v9fs_vfs_getattr - retrieve file metadata
1071 * @path: Object to query
1072 * @stat: metadata structure to populate
1073 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
1074 * @flags: AT_STATX_xxx setting
1075 *
1076 */
1077
1078static int
1079v9fs_vfs_getattr(const struct path *path, struct kstat *stat,
1080 u32 request_mask, unsigned int flags)
1081{
1082 struct dentry *dentry = path->dentry;
1083 struct v9fs_session_info *v9ses;
1084 struct p9_fid *fid;
1085 struct p9_wstat *st;
1086
1087 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1088 v9ses = v9fs_dentry2v9ses(dentry);
1089 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1090 generic_fillattr(d_inode(dentry), stat);
1091 return 0;
1092 }
1093 fid = v9fs_fid_lookup(dentry);
1094 if (IS_ERR(fid))
1095 return PTR_ERR(fid);
1096
1097 st = p9_client_stat(fid);
1098 if (IS_ERR(st))
1099 return PTR_ERR(st);
1100
1101 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb);
1102 generic_fillattr(d_inode(dentry), stat);
1103
1104 p9stat_free(st);
1105 kfree(st);
1106 return 0;
1107}
1108
1109/**
1110 * v9fs_vfs_setattr - set file metadata
1111 * @dentry: file whose metadata to set
1112 * @iattr: metadata assignment structure
1113 *
1114 */
1115
1116static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
1117{
1118 int retval;
1119 struct v9fs_session_info *v9ses;
1120 struct p9_fid *fid;
1121 struct p9_wstat wstat;
1122
1123 p9_debug(P9_DEBUG_VFS, "\n");
1124 retval = setattr_prepare(dentry, iattr);
1125 if (retval)
1126 return retval;
1127
1128 retval = -EPERM;
1129 v9ses = v9fs_dentry2v9ses(dentry);
1130 fid = v9fs_fid_lookup(dentry);
1131 if(IS_ERR(fid))
1132 return PTR_ERR(fid);
1133
1134 v9fs_blank_wstat(&wstat);
1135 if (iattr->ia_valid & ATTR_MODE)
1136 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1137
1138 if (iattr->ia_valid & ATTR_MTIME)
1139 wstat.mtime = iattr->ia_mtime.tv_sec;
1140
1141 if (iattr->ia_valid & ATTR_ATIME)
1142 wstat.atime = iattr->ia_atime.tv_sec;
1143
1144 if (iattr->ia_valid & ATTR_SIZE)
1145 wstat.length = iattr->ia_size;
1146
1147 if (v9fs_proto_dotu(v9ses)) {
1148 if (iattr->ia_valid & ATTR_UID)
1149 wstat.n_uid = iattr->ia_uid;
1150
1151 if (iattr->ia_valid & ATTR_GID)
1152 wstat.n_gid = iattr->ia_gid;
1153 }
1154
1155 /* Write all dirty data */
1156 if (d_is_reg(dentry))
1157 filemap_write_and_wait(d_inode(dentry)->i_mapping);
1158
1159 retval = p9_client_wstat(fid, &wstat);
1160 if (retval < 0)
1161 return retval;
1162
1163 if ((iattr->ia_valid & ATTR_SIZE) &&
1164 iattr->ia_size != i_size_read(d_inode(dentry)))
1165 truncate_setsize(d_inode(dentry), iattr->ia_size);
1166
1167 v9fs_invalidate_inode_attr(d_inode(dentry));
1168
1169 setattr_copy(d_inode(dentry), iattr);
1170 mark_inode_dirty(d_inode(dentry));
1171 return 0;
1172}
1173
1174/**
1175 * v9fs_stat2inode - populate an inode structure with mistat info
1176 * @stat: Plan 9 metadata (mistat) structure
1177 * @inode: inode to populate
1178 * @sb: superblock of filesystem
1179 *
1180 */
1181
1182void
1183v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1184 struct super_block *sb)
1185{
1186 umode_t mode;
1187 char ext[32];
1188 char tag_name[14];
1189 unsigned int i_nlink;
1190 struct v9fs_session_info *v9ses = sb->s_fs_info;
1191 struct v9fs_inode *v9inode = V9FS_I(inode);
1192
1193 set_nlink(inode, 1);
1194
1195 inode->i_atime.tv_sec = stat->atime;
1196 inode->i_mtime.tv_sec = stat->mtime;
1197 inode->i_ctime.tv_sec = stat->mtime;
1198
1199 inode->i_uid = v9ses->dfltuid;
1200 inode->i_gid = v9ses->dfltgid;
1201
1202 if (v9fs_proto_dotu(v9ses)) {
1203 inode->i_uid = stat->n_uid;
1204 inode->i_gid = stat->n_gid;
1205 }
1206 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1207 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1208 /*
1209 * Hadlink support got added later to
1210 * to the .u extension. So there can be
1211 * server out there that doesn't support
1212 * this even with .u extension. So check
1213 * for non NULL stat->extension
1214 */
1215 strlcpy(ext, stat->extension, sizeof(ext));
1216 /* HARDLINKCOUNT %u */
1217 sscanf(ext, "%13s %u", tag_name, &i_nlink);
1218 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1219 set_nlink(inode, i_nlink);
1220 }
1221 }
1222 mode = p9mode2perm(v9ses, stat);
1223 mode |= inode->i_mode & ~S_IALLUGO;
1224 inode->i_mode = mode;
1225 i_size_write(inode, stat->length);
1226
1227 /* not real number of blocks, but 512 byte ones ... */
1228 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
1229 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1230}
1231
1232/**
1233 * v9fs_qid2ino - convert qid into inode number
1234 * @qid: qid to hash
1235 *
1236 * BUG: potential for inode number collisions?
1237 */
1238
1239ino_t v9fs_qid2ino(struct p9_qid *qid)
1240{
1241 u64 path = qid->path + 2;
1242 ino_t i = 0;
1243
1244 if (sizeof(ino_t) == sizeof(path))
1245 memcpy(&i, &path, sizeof(ino_t));
1246 else
1247 i = (ino_t) (path ^ (path >> 32));
1248
1249 return i;
1250}
1251
1252/**
1253 * v9fs_vfs_get_link - follow a symlink path
1254 * @dentry: dentry for symlink
1255 * @inode: inode for symlink
1256 * @done: delayed call for when we are done with the return value
1257 */
1258
1259static const char *v9fs_vfs_get_link(struct dentry *dentry,
1260 struct inode *inode,
1261 struct delayed_call *done)
1262{
1263 struct v9fs_session_info *v9ses;
1264 struct p9_fid *fid;
1265 struct p9_wstat *st;
1266 char *res;
1267
1268 if (!dentry)
1269 return ERR_PTR(-ECHILD);
1270
1271 v9ses = v9fs_dentry2v9ses(dentry);
1272 fid = v9fs_fid_lookup(dentry);
1273 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
1274
1275 if (IS_ERR(fid))
1276 return ERR_CAST(fid);
1277
1278 if (!v9fs_proto_dotu(v9ses))
1279 return ERR_PTR(-EBADF);
1280
1281 st = p9_client_stat(fid);
1282 if (IS_ERR(st))
1283 return ERR_CAST(st);
1284
1285 if (!(st->mode & P9_DMSYMLINK)) {
1286 p9stat_free(st);
1287 kfree(st);
1288 return ERR_PTR(-EINVAL);
1289 }
1290 res = st->extension;
1291 st->extension = NULL;
1292 if (strlen(res) >= PATH_MAX)
1293 res[PATH_MAX - 1] = '\0';
1294
1295 p9stat_free(st);
1296 kfree(st);
1297 set_delayed_call(done, kfree_link, res);
1298 return res;
1299}
1300
1301/**
1302 * v9fs_vfs_mkspecial - create a special file
1303 * @dir: inode to create special file in
1304 * @dentry: dentry to create
1305 * @perm: mode to create special file
1306 * @extension: 9p2000.u format extension string representing special file
1307 *
1308 */
1309
1310static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1311 u32 perm, const char *extension)
1312{
1313 struct p9_fid *fid;
1314 struct v9fs_session_info *v9ses;
1315
1316 v9ses = v9fs_inode2v9ses(dir);
1317 if (!v9fs_proto_dotu(v9ses)) {
1318 p9_debug(P9_DEBUG_ERROR, "not extended\n");
1319 return -EPERM;
1320 }
1321
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_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n",
1346 dir->i_ino, dentry, symname);
1347
1348 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname);
1349}
1350
1351#define U32_MAX_DIGITS 10
1352
1353/**
1354 * v9fs_vfs_link - create a hardlink
1355 * @old_dentry: dentry for file to link to
1356 * @dir: inode destination for new link
1357 * @dentry: dentry for link
1358 *
1359 */
1360
1361static int
1362v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1363 struct dentry *dentry)
1364{
1365 int retval;
1366 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */
1367 struct p9_fid *oldfid;
1368
1369 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n",
1370 dir->i_ino, dentry, old_dentry);
1371
1372 oldfid = v9fs_fid_clone(old_dentry);
1373 if (IS_ERR(oldfid))
1374 return PTR_ERR(oldfid);
1375
1376 sprintf(name, "%d\n", oldfid->fid);
1377 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1378 if (!retval) {
1379 v9fs_refresh_inode(oldfid, d_inode(old_dentry));
1380 v9fs_invalidate_inode_attr(dir);
1381 }
1382 p9_client_clunk(oldfid);
1383 return retval;
1384}
1385
1386/**
1387 * v9fs_vfs_mknod - create a special file
1388 * @dir: inode destination for new link
1389 * @dentry: dentry for file
1390 * @mode: mode for creation
1391 * @rdev: device associated with special file
1392 *
1393 */
1394
1395static int
1396v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
1397{
1398 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1399 int retval;
1400 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1];
1401 u32 perm;
1402
1403 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
1404 dir->i_ino, dentry, mode,
1405 MAJOR(rdev), MINOR(rdev));
1406
1407 /* build extension */
1408 if (S_ISBLK(mode))
1409 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1410 else if (S_ISCHR(mode))
1411 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1412 else
1413 *name = 0;
1414
1415 perm = unixmode2p9mode(v9ses, mode);
1416 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name);
1417
1418 return retval;
1419}
1420
1421int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1422{
1423 int umode;
1424 dev_t rdev;
1425 loff_t i_size;
1426 struct p9_wstat *st;
1427 struct v9fs_session_info *v9ses;
1428
1429 v9ses = v9fs_inode2v9ses(inode);
1430 st = p9_client_stat(fid);
1431 if (IS_ERR(st))
1432 return PTR_ERR(st);
1433 /*
1434 * Don't update inode if the file type is different
1435 */
1436 umode = p9mode2unixmode(v9ses, st, &rdev);
1437 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
1438 goto out;
1439
1440 spin_lock(&inode->i_lock);
1441 /*
1442 * We don't want to refresh inode->i_size,
1443 * because we may have cached data
1444 */
1445 i_size = inode->i_size;
1446 v9fs_stat2inode(st, inode, inode->i_sb);
1447 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
1448 inode->i_size = i_size;
1449 spin_unlock(&inode->i_lock);
1450out:
1451 p9stat_free(st);
1452 kfree(st);
1453 return 0;
1454}
1455
1456static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1457 .create = v9fs_vfs_create,
1458 .lookup = v9fs_vfs_lookup,
1459 .atomic_open = v9fs_vfs_atomic_open,
1460 .symlink = v9fs_vfs_symlink,
1461 .link = v9fs_vfs_link,
1462 .unlink = v9fs_vfs_unlink,
1463 .mkdir = v9fs_vfs_mkdir,
1464 .rmdir = v9fs_vfs_rmdir,
1465 .mknod = v9fs_vfs_mknod,
1466 .rename = v9fs_vfs_rename,
1467 .getattr = v9fs_vfs_getattr,
1468 .setattr = v9fs_vfs_setattr,
1469};
1470
1471static const struct inode_operations v9fs_dir_inode_operations = {
1472 .create = v9fs_vfs_create,
1473 .lookup = v9fs_vfs_lookup,
1474 .atomic_open = v9fs_vfs_atomic_open,
1475 .unlink = v9fs_vfs_unlink,
1476 .mkdir = v9fs_vfs_mkdir,
1477 .rmdir = v9fs_vfs_rmdir,
1478 .mknod = v9fs_vfs_mknod,
1479 .rename = v9fs_vfs_rename,
1480 .getattr = v9fs_vfs_getattr,
1481 .setattr = v9fs_vfs_setattr,
1482};
1483
1484static const struct inode_operations v9fs_file_inode_operations = {
1485 .getattr = v9fs_vfs_getattr,
1486 .setattr = v9fs_vfs_setattr,
1487};
1488
1489static const struct inode_operations v9fs_symlink_inode_operations = {
1490 .get_link = v9fs_vfs_get_link,
1491 .getattr = v9fs_vfs_getattr,
1492 .setattr = v9fs_vfs_setattr,
1493};
1494