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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#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;
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 return 1;
487}
488
489static int v9fs_test_new_inode(struct inode *inode, void *data)
490{
491 return 0;
492}
493
494static int v9fs_set_inode(struct inode *inode, void *data)
495{
496 struct v9fs_inode *v9inode = V9FS_I(inode);
497 struct p9_wstat *st = (struct p9_wstat *)data;
498
499 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
500 return 0;
501}
502
503static struct inode *v9fs_qid_iget(struct super_block *sb,
504 struct p9_qid *qid,
505 struct p9_wstat *st,
506 int new)
507{
508 dev_t rdev;
509 int retval;
510 umode_t umode;
511 unsigned long i_ino;
512 struct inode *inode;
513 struct v9fs_session_info *v9ses = sb->s_fs_info;
514 int (*test)(struct inode *, void *);
515
516 if (new)
517 test = v9fs_test_new_inode;
518 else
519 test = v9fs_test_inode;
520
521 i_ino = v9fs_qid2ino(qid);
522 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
523 if (!inode)
524 return ERR_PTR(-ENOMEM);
525 if (!(inode->i_state & I_NEW))
526 return inode;
527 /*
528 * initialize the inode with the stat info
529 * FIXME!! we may need support for stale inodes
530 * later.
531 */
532 inode->i_ino = i_ino;
533 umode = p9mode2unixmode(v9ses, st, &rdev);
534 retval = v9fs_init_inode(v9ses, inode, umode, rdev);
535 if (retval)
536 goto error;
537
538 v9fs_stat2inode(st, inode, sb);
539 v9fs_cache_inode_get_cookie(inode);
540 unlock_new_inode(inode);
541 return inode;
542error:
543 iget_failed(inode);
544 return ERR_PTR(retval);
545
546}
547
548struct inode *
549v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
550 struct super_block *sb, int new)
551{
552 struct p9_wstat *st;
553 struct inode *inode = NULL;
554
555 st = p9_client_stat(fid);
556 if (IS_ERR(st))
557 return ERR_CAST(st);
558
559 inode = v9fs_qid_iget(sb, &st->qid, st, new);
560 p9stat_free(st);
561 kfree(st);
562 return inode;
563}
564
565/**
566 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
567 * plan 9 AT flag.
568 * @flags: flags to convert
569 */
570static int v9fs_at_to_dotl_flags(int flags)
571{
572 int rflags = 0;
573 if (flags & AT_REMOVEDIR)
574 rflags |= P9_DOTL_AT_REMOVEDIR;
575 return rflags;
576}
577
578/**
579 * v9fs_remove - helper function to remove files and directories
580 * @dir: directory inode that is being deleted
581 * @dentry: dentry that is being deleted
582 * @flags: removing a directory
583 *
584 */
585
586static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
587{
588 struct inode *inode;
589 int retval = -EOPNOTSUPP;
590 struct p9_fid *v9fid, *dfid;
591 struct v9fs_session_info *v9ses;
592
593 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
594 dir, dentry, flags);
595
596 v9ses = v9fs_inode2v9ses(dir);
597 inode = d_inode(dentry);
598 dfid = v9fs_fid_lookup(dentry->d_parent);
599 if (IS_ERR(dfid)) {
600 retval = PTR_ERR(dfid);
601 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
602 return retval;
603 }
604 if (v9fs_proto_dotl(v9ses))
605 retval = p9_client_unlinkat(dfid, dentry->d_name.name,
606 v9fs_at_to_dotl_flags(flags));
607 if (retval == -EOPNOTSUPP) {
608 /* Try the one based on path */
609 v9fid = v9fs_fid_clone(dentry);
610 if (IS_ERR(v9fid))
611 return PTR_ERR(v9fid);
612 retval = p9_client_remove(v9fid);
613 }
614 if (!retval) {
615 /*
616 * directories on unlink should have zero
617 * link count
618 */
619 if (flags & AT_REMOVEDIR) {
620 clear_nlink(inode);
621 drop_nlink(dir);
622 } else
623 drop_nlink(inode);
624
625 v9fs_invalidate_inode_attr(inode);
626 v9fs_invalidate_inode_attr(dir);
627 }
628 return retval;
629}
630
631/**
632 * v9fs_create - Create a file
633 * @v9ses: session information
634 * @dir: directory that dentry is being created in
635 * @dentry: dentry that is being created
636 * @extension: 9p2000.u extension string to support devices, etc.
637 * @perm: create permissions
638 * @mode: open mode
639 *
640 */
641static struct p9_fid *
642v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
643 struct dentry *dentry, char *extension, u32 perm, u8 mode)
644{
645 int err;
646 char *name;
647 struct p9_fid *dfid, *ofid, *fid;
648 struct inode *inode;
649
650 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
651
652 err = 0;
653 ofid = NULL;
654 fid = NULL;
655 name = (char *) dentry->d_name.name;
656 dfid = v9fs_fid_lookup(dentry->d_parent);
657 if (IS_ERR(dfid)) {
658 err = PTR_ERR(dfid);
659 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
660 return ERR_PTR(err);
661 }
662
663 /* clone a fid to use for creation */
664 ofid = p9_client_walk(dfid, 0, NULL, 1);
665 if (IS_ERR(ofid)) {
666 err = PTR_ERR(ofid);
667 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
668 return ERR_PTR(err);
669 }
670
671 err = p9_client_fcreate(ofid, name, perm, mode, extension);
672 if (err < 0) {
673 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
674 goto error;
675 }
676
677 if (!(perm & P9_DMLINK)) {
678 /* now walk from the parent so we can get unopened fid */
679 fid = p9_client_walk(dfid, 1, &name, 1);
680 if (IS_ERR(fid)) {
681 err = PTR_ERR(fid);
682 p9_debug(P9_DEBUG_VFS,
683 "p9_client_walk failed %d\n", err);
684 fid = NULL;
685 goto error;
686 }
687 /*
688 * instantiate inode and assign the unopened fid to the dentry
689 */
690 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
691 if (IS_ERR(inode)) {
692 err = PTR_ERR(inode);
693 p9_debug(P9_DEBUG_VFS,
694 "inode creation failed %d\n", err);
695 goto error;
696 }
697 v9fs_fid_add(dentry, fid);
698 d_instantiate(dentry, inode);
699 }
700 return ofid;
701error:
702 if (ofid)
703 p9_client_clunk(ofid);
704
705 if (fid)
706 p9_client_clunk(fid);
707
708 return ERR_PTR(err);
709}
710
711/**
712 * v9fs_vfs_create - VFS hook to create a regular file
713 *
714 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called
715 * for mknod(2).
716 *
717 * @dir: directory inode that is being created
718 * @dentry: dentry that is being deleted
719 * @mode: create permissions
720 *
721 */
722
723static int
724v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
725 bool excl)
726{
727 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
728 u32 perm = unixmode2p9mode(v9ses, mode);
729 struct p9_fid *fid;
730
731 /* P9_OEXCL? */
732 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR);
733 if (IS_ERR(fid))
734 return PTR_ERR(fid);
735
736 v9fs_invalidate_inode_attr(dir);
737 p9_client_clunk(fid);
738
739 return 0;
740}
741
742/**
743 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
744 * @dir: inode that is being unlinked
745 * @dentry: dentry that is being unlinked
746 * @mode: mode for new directory
747 *
748 */
749
750static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
751{
752 int err;
753 u32 perm;
754 struct p9_fid *fid;
755 struct v9fs_session_info *v9ses;
756
757 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
758 err = 0;
759 v9ses = v9fs_inode2v9ses(dir);
760 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
761 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
762 if (IS_ERR(fid)) {
763 err = PTR_ERR(fid);
764 fid = NULL;
765 } else {
766 inc_nlink(dir);
767 v9fs_invalidate_inode_attr(dir);
768 }
769
770 if (fid)
771 p9_client_clunk(fid);
772
773 return err;
774}
775
776/**
777 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
778 * @dir: inode that is being walked from
779 * @dentry: dentry that is being walked to?
780 * @flags: lookup flags (unused)
781 *
782 */
783
784struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
785 unsigned int flags)
786{
787 struct dentry *res;
788 struct v9fs_session_info *v9ses;
789 struct p9_fid *dfid, *fid;
790 struct inode *inode;
791 char *name;
792
793 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n",
794 dir, dentry, dentry, flags);
795
796 if (dentry->d_name.len > NAME_MAX)
797 return ERR_PTR(-ENAMETOOLONG);
798
799 v9ses = v9fs_inode2v9ses(dir);
800 /* We can walk d_parent because we hold the dir->i_mutex */
801 dfid = v9fs_fid_lookup(dentry->d_parent);
802 if (IS_ERR(dfid))
803 return ERR_CAST(dfid);
804
805 name = (char *) dentry->d_name.name;
806 fid = p9_client_walk(dfid, 1, &name, 1);
807 if (IS_ERR(fid)) {
808 if (fid == ERR_PTR(-ENOENT)) {
809 d_add(dentry, NULL);
810 return NULL;
811 }
812 return ERR_CAST(fid);
813 }
814 /*
815 * Make sure we don't use a wrong inode due to parallel
816 * unlink. For cached mode create calls request for new
817 * inode. But with cache disabled, lookup should do this.
818 */
819 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
820 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
821 else
822 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
823 if (IS_ERR(inode)) {
824 p9_client_clunk(fid);
825 return ERR_CAST(inode);
826 }
827 /*
828 * If we had a rename on the server and a parallel lookup
829 * for the new name, then make sure we instantiate with
830 * the new name. ie look up for a/b, while on server somebody
831 * moved b under k and client parallely did a lookup for
832 * k/b.
833 */
834 res = d_splice_alias(inode, dentry);
835 if (!res)
836 v9fs_fid_add(dentry, fid);
837 else if (!IS_ERR(res))
838 v9fs_fid_add(res, fid);
839 else
840 p9_client_clunk(fid);
841 return res;
842}
843
844static int
845v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
846 struct file *file, unsigned flags, umode_t mode,
847 int *opened)
848{
849 int err;
850 u32 perm;
851 struct v9fs_inode *v9inode;
852 struct v9fs_session_info *v9ses;
853 struct p9_fid *fid, *inode_fid;
854 struct dentry *res = NULL;
855
856 if (d_unhashed(dentry)) {
857 res = v9fs_vfs_lookup(dir, dentry, 0);
858 if (IS_ERR(res))
859 return PTR_ERR(res);
860
861 if (res)
862 dentry = res;
863 }
864
865 /* Only creates */
866 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
867 return finish_no_open(file, res);
868
869 err = 0;
870
871 v9ses = v9fs_inode2v9ses(dir);
872 perm = unixmode2p9mode(v9ses, mode);
873 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
874 v9fs_uflags2omode(flags,
875 v9fs_proto_dotu(v9ses)));
876 if (IS_ERR(fid)) {
877 err = PTR_ERR(fid);
878 fid = NULL;
879 goto error;
880 }
881
882 v9fs_invalidate_inode_attr(dir);
883 v9inode = V9FS_I(d_inode(dentry));
884 mutex_lock(&v9inode->v_mutex);
885 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
886 !v9inode->writeback_fid &&
887 ((flags & O_ACCMODE) != O_RDONLY)) {
888 /*
889 * clone a fid and add it to writeback_fid
890 * we do it during open time instead of
891 * page dirty time via write_begin/page_mkwrite
892 * because we want write after unlink usecase
893 * to work.
894 */
895 inode_fid = v9fs_writeback_fid(dentry);
896 if (IS_ERR(inode_fid)) {
897 err = PTR_ERR(inode_fid);
898 mutex_unlock(&v9inode->v_mutex);
899 goto error;
900 }
901 v9inode->writeback_fid = (void *) inode_fid;
902 }
903 mutex_unlock(&v9inode->v_mutex);
904 err = finish_open(file, dentry, generic_file_open, opened);
905 if (err)
906 goto error;
907
908 file->private_data = fid;
909 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
910 v9fs_cache_inode_set_cookie(d_inode(dentry), file);
911
912 *opened |= FILE_CREATED;
913out:
914 dput(res);
915 return err;
916
917error:
918 if (fid)
919 p9_client_clunk(fid);
920 goto out;
921}
922
923/**
924 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
925 * @i: inode that is being unlinked
926 * @d: dentry that is being unlinked
927 *
928 */
929
930int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
931{
932 return v9fs_remove(i, d, 0);
933}
934
935/**
936 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
937 * @i: inode that is being unlinked
938 * @d: dentry that is being unlinked
939 *
940 */
941
942int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
943{
944 return v9fs_remove(i, d, AT_REMOVEDIR);
945}
946
947/**
948 * v9fs_vfs_rename - VFS hook to rename an inode
949 * @old_dir: old dir inode
950 * @old_dentry: old dentry
951 * @new_dir: new dir inode
952 * @new_dentry: new dentry
953 *
954 */
955
956int
957v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
958 struct inode *new_dir, struct dentry *new_dentry)
959{
960 int retval;
961 struct inode *old_inode;
962 struct inode *new_inode;
963 struct v9fs_session_info *v9ses;
964 struct p9_fid *oldfid;
965 struct p9_fid *olddirfid;
966 struct p9_fid *newdirfid;
967 struct p9_wstat wstat;
968
969 p9_debug(P9_DEBUG_VFS, "\n");
970 retval = 0;
971 old_inode = d_inode(old_dentry);
972 new_inode = d_inode(new_dentry);
973 v9ses = v9fs_inode2v9ses(old_inode);
974 oldfid = v9fs_fid_lookup(old_dentry);
975 if (IS_ERR(oldfid))
976 return PTR_ERR(oldfid);
977
978 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
979 if (IS_ERR(olddirfid)) {
980 retval = PTR_ERR(olddirfid);
981 goto done;
982 }
983
984 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
985 if (IS_ERR(newdirfid)) {
986 retval = PTR_ERR(newdirfid);
987 goto clunk_olddir;
988 }
989
990 down_write(&v9ses->rename_sem);
991 if (v9fs_proto_dotl(v9ses)) {
992 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
993 newdirfid, new_dentry->d_name.name);
994 if (retval == -EOPNOTSUPP)
995 retval = p9_client_rename(oldfid, newdirfid,
996 new_dentry->d_name.name);
997 if (retval != -EOPNOTSUPP)
998 goto clunk_newdir;
999 }
1000 if (old_dentry->d_parent != new_dentry->d_parent) {
1001 /*
1002 * 9P .u can only handle file rename in the same directory
1003 */
1004
1005 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
1006 retval = -EXDEV;
1007 goto clunk_newdir;
1008 }
1009 v9fs_blank_wstat(&wstat);
1010 wstat.muid = v9ses->uname;
1011 wstat.name = (char *) new_dentry->d_name.name;
1012 retval = p9_client_wstat(oldfid, &wstat);
1013
1014clunk_newdir:
1015 if (!retval) {
1016 if (new_inode) {
1017 if (S_ISDIR(new_inode->i_mode))
1018 clear_nlink(new_inode);
1019 else
1020 drop_nlink(new_inode);
1021 }
1022 if (S_ISDIR(old_inode->i_mode)) {
1023 if (!new_inode)
1024 inc_nlink(new_dir);
1025 drop_nlink(old_dir);
1026 }
1027 v9fs_invalidate_inode_attr(old_inode);
1028 v9fs_invalidate_inode_attr(old_dir);
1029 v9fs_invalidate_inode_attr(new_dir);
1030
1031 /* successful rename */
1032 d_move(old_dentry, new_dentry);
1033 }
1034 up_write(&v9ses->rename_sem);
1035 p9_client_clunk(newdirfid);
1036
1037clunk_olddir:
1038 p9_client_clunk(olddirfid);
1039
1040done:
1041 return retval;
1042}
1043
1044/**
1045 * v9fs_vfs_getattr - retrieve file metadata
1046 * @mnt: mount information
1047 * @dentry: file to get attributes on
1048 * @stat: metadata structure to populate
1049 *
1050 */
1051
1052static int
1053v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1054 struct kstat *stat)
1055{
1056 struct v9fs_session_info *v9ses;
1057 struct p9_fid *fid;
1058 struct p9_wstat *st;
1059
1060 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1061 v9ses = v9fs_dentry2v9ses(dentry);
1062 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1063 generic_fillattr(d_inode(dentry), stat);
1064 return 0;
1065 }
1066 fid = v9fs_fid_lookup(dentry);
1067 if (IS_ERR(fid))
1068 return PTR_ERR(fid);
1069
1070 st = p9_client_stat(fid);
1071 if (IS_ERR(st))
1072 return PTR_ERR(st);
1073
1074 v9fs_stat2inode(st, d_inode(dentry), d_inode(dentry)->i_sb);
1075 generic_fillattr(d_inode(dentry), stat);
1076
1077 p9stat_free(st);
1078 kfree(st);
1079 return 0;
1080}
1081
1082/**
1083 * v9fs_vfs_setattr - set file metadata
1084 * @dentry: file whose metadata to set
1085 * @iattr: metadata assignment structure
1086 *
1087 */
1088
1089static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
1090{
1091 int retval;
1092 struct v9fs_session_info *v9ses;
1093 struct p9_fid *fid;
1094 struct p9_wstat wstat;
1095
1096 p9_debug(P9_DEBUG_VFS, "\n");
1097 retval = inode_change_ok(d_inode(dentry), iattr);
1098 if (retval)
1099 return retval;
1100
1101 retval = -EPERM;
1102 v9ses = v9fs_dentry2v9ses(dentry);
1103 fid = v9fs_fid_lookup(dentry);
1104 if(IS_ERR(fid))
1105 return PTR_ERR(fid);
1106
1107 v9fs_blank_wstat(&wstat);
1108 if (iattr->ia_valid & ATTR_MODE)
1109 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1110
1111 if (iattr->ia_valid & ATTR_MTIME)
1112 wstat.mtime = iattr->ia_mtime.tv_sec;
1113
1114 if (iattr->ia_valid & ATTR_ATIME)
1115 wstat.atime = iattr->ia_atime.tv_sec;
1116
1117 if (iattr->ia_valid & ATTR_SIZE)
1118 wstat.length = iattr->ia_size;
1119
1120 if (v9fs_proto_dotu(v9ses)) {
1121 if (iattr->ia_valid & ATTR_UID)
1122 wstat.n_uid = iattr->ia_uid;
1123
1124 if (iattr->ia_valid & ATTR_GID)
1125 wstat.n_gid = iattr->ia_gid;
1126 }
1127
1128 /* Write all dirty data */
1129 if (d_is_reg(dentry))
1130 filemap_write_and_wait(d_inode(dentry)->i_mapping);
1131
1132 retval = p9_client_wstat(fid, &wstat);
1133 if (retval < 0)
1134 return retval;
1135
1136 if ((iattr->ia_valid & ATTR_SIZE) &&
1137 iattr->ia_size != i_size_read(d_inode(dentry)))
1138 truncate_setsize(d_inode(dentry), iattr->ia_size);
1139
1140 v9fs_invalidate_inode_attr(d_inode(dentry));
1141
1142 setattr_copy(d_inode(dentry), iattr);
1143 mark_inode_dirty(d_inode(dentry));
1144 return 0;
1145}
1146
1147/**
1148 * v9fs_stat2inode - populate an inode structure with mistat info
1149 * @stat: Plan 9 metadata (mistat) structure
1150 * @inode: inode to populate
1151 * @sb: superblock of filesystem
1152 *
1153 */
1154
1155void
1156v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1157 struct super_block *sb)
1158{
1159 umode_t mode;
1160 char ext[32];
1161 char tag_name[14];
1162 unsigned int i_nlink;
1163 struct v9fs_session_info *v9ses = sb->s_fs_info;
1164 struct v9fs_inode *v9inode = V9FS_I(inode);
1165
1166 set_nlink(inode, 1);
1167
1168 inode->i_atime.tv_sec = stat->atime;
1169 inode->i_mtime.tv_sec = stat->mtime;
1170 inode->i_ctime.tv_sec = stat->mtime;
1171
1172 inode->i_uid = v9ses->dfltuid;
1173 inode->i_gid = v9ses->dfltgid;
1174
1175 if (v9fs_proto_dotu(v9ses)) {
1176 inode->i_uid = stat->n_uid;
1177 inode->i_gid = stat->n_gid;
1178 }
1179 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1180 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1181 /*
1182 * Hadlink support got added later to
1183 * to the .u extension. So there can be
1184 * server out there that doesn't support
1185 * this even with .u extension. So check
1186 * for non NULL stat->extension
1187 */
1188 strlcpy(ext, stat->extension, sizeof(ext));
1189 /* HARDLINKCOUNT %u */
1190 sscanf(ext, "%13s %u", tag_name, &i_nlink);
1191 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1192 set_nlink(inode, i_nlink);
1193 }
1194 }
1195 mode = p9mode2perm(v9ses, stat);
1196 mode |= inode->i_mode & ~S_IALLUGO;
1197 inode->i_mode = mode;
1198 i_size_write(inode, stat->length);
1199
1200 /* not real number of blocks, but 512 byte ones ... */
1201 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
1202 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1203}
1204
1205/**
1206 * v9fs_qid2ino - convert qid into inode number
1207 * @qid: qid to hash
1208 *
1209 * BUG: potential for inode number collisions?
1210 */
1211
1212ino_t v9fs_qid2ino(struct p9_qid *qid)
1213{
1214 u64 path = qid->path + 2;
1215 ino_t i = 0;
1216
1217 if (sizeof(ino_t) == sizeof(path))
1218 memcpy(&i, &path, sizeof(ino_t));
1219 else
1220 i = (ino_t) (path ^ (path >> 32));
1221
1222 return i;
1223}
1224
1225/**
1226 * v9fs_vfs_get_link - follow a symlink path
1227 * @dentry: dentry for symlink
1228 * @inode: inode for symlink
1229 * @done: delayed call for when we are done with the return value
1230 */
1231
1232static const char *v9fs_vfs_get_link(struct dentry *dentry,
1233 struct inode *inode,
1234 struct delayed_call *done)
1235{
1236 struct v9fs_session_info *v9ses;
1237 struct p9_fid *fid;
1238 struct p9_wstat *st;
1239 char *res;
1240
1241 if (!dentry)
1242 return ERR_PTR(-ECHILD);
1243
1244 v9ses = v9fs_dentry2v9ses(dentry);
1245 fid = v9fs_fid_lookup(dentry);
1246 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
1247
1248 if (IS_ERR(fid))
1249 return ERR_CAST(fid);
1250
1251 if (!v9fs_proto_dotu(v9ses))
1252 return ERR_PTR(-EBADF);
1253
1254 st = p9_client_stat(fid);
1255 if (IS_ERR(st))
1256 return ERR_CAST(st);
1257
1258 if (!(st->mode & P9_DMSYMLINK)) {
1259 p9stat_free(st);
1260 kfree(st);
1261 return ERR_PTR(-EINVAL);
1262 }
1263 res = st->extension;
1264 st->extension = NULL;
1265 if (strlen(res) >= PATH_MAX)
1266 res[PATH_MAX - 1] = '\0';
1267
1268 p9stat_free(st);
1269 kfree(st);
1270 set_delayed_call(done, kfree_link, res);
1271 return res;
1272}
1273
1274/**
1275 * v9fs_vfs_mkspecial - create a special file
1276 * @dir: inode to create special file in
1277 * @dentry: dentry to create
1278 * @perm: mode to create special file
1279 * @extension: 9p2000.u format extension string representing special file
1280 *
1281 */
1282
1283static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1284 u32 perm, const char *extension)
1285{
1286 struct p9_fid *fid;
1287 struct v9fs_session_info *v9ses;
1288
1289 v9ses = v9fs_inode2v9ses(dir);
1290 if (!v9fs_proto_dotu(v9ses)) {
1291 p9_debug(P9_DEBUG_ERROR, "not extended\n");
1292 return -EPERM;
1293 }
1294
1295 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1296 P9_OREAD);
1297 if (IS_ERR(fid))
1298 return PTR_ERR(fid);
1299
1300 v9fs_invalidate_inode_attr(dir);
1301 p9_client_clunk(fid);
1302 return 0;
1303}
1304
1305/**
1306 * v9fs_vfs_symlink - helper function to create symlinks
1307 * @dir: directory inode containing symlink
1308 * @dentry: dentry for symlink
1309 * @symname: symlink data
1310 *
1311 * See Also: 9P2000.u RFC for more information
1312 *
1313 */
1314
1315static int
1316v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1317{
1318 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n",
1319 dir->i_ino, dentry, symname);
1320
1321 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname);
1322}
1323
1324#define U32_MAX_DIGITS 10
1325
1326/**
1327 * v9fs_vfs_link - create a hardlink
1328 * @old_dentry: dentry for file to link to
1329 * @dir: inode destination for new link
1330 * @dentry: dentry for link
1331 *
1332 */
1333
1334static int
1335v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1336 struct dentry *dentry)
1337{
1338 int retval;
1339 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */
1340 struct p9_fid *oldfid;
1341
1342 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n",
1343 dir->i_ino, dentry, old_dentry);
1344
1345 oldfid = v9fs_fid_clone(old_dentry);
1346 if (IS_ERR(oldfid))
1347 return PTR_ERR(oldfid);
1348
1349 sprintf(name, "%d\n", oldfid->fid);
1350 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1351 if (!retval) {
1352 v9fs_refresh_inode(oldfid, d_inode(old_dentry));
1353 v9fs_invalidate_inode_attr(dir);
1354 }
1355 p9_client_clunk(oldfid);
1356 return retval;
1357}
1358
1359/**
1360 * v9fs_vfs_mknod - create a special file
1361 * @dir: inode destination for new link
1362 * @dentry: dentry for file
1363 * @mode: mode for creation
1364 * @rdev: device associated with special file
1365 *
1366 */
1367
1368static int
1369v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
1370{
1371 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1372 int retval;
1373 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1];
1374 u32 perm;
1375
1376 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
1377 dir->i_ino, dentry, mode,
1378 MAJOR(rdev), MINOR(rdev));
1379
1380 /* build extension */
1381 if (S_ISBLK(mode))
1382 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1383 else if (S_ISCHR(mode))
1384 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1385 else
1386 *name = 0;
1387
1388 perm = unixmode2p9mode(v9ses, mode);
1389 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name);
1390
1391 return retval;
1392}
1393
1394int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1395{
1396 int umode;
1397 dev_t rdev;
1398 loff_t i_size;
1399 struct p9_wstat *st;
1400 struct v9fs_session_info *v9ses;
1401
1402 v9ses = v9fs_inode2v9ses(inode);
1403 st = p9_client_stat(fid);
1404 if (IS_ERR(st))
1405 return PTR_ERR(st);
1406 /*
1407 * Don't update inode if the file type is different
1408 */
1409 umode = p9mode2unixmode(v9ses, st, &rdev);
1410 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
1411 goto out;
1412
1413 spin_lock(&inode->i_lock);
1414 /*
1415 * We don't want to refresh inode->i_size,
1416 * because we may have cached data
1417 */
1418 i_size = inode->i_size;
1419 v9fs_stat2inode(st, inode, inode->i_sb);
1420 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
1421 inode->i_size = i_size;
1422 spin_unlock(&inode->i_lock);
1423out:
1424 p9stat_free(st);
1425 kfree(st);
1426 return 0;
1427}
1428
1429static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1430 .create = v9fs_vfs_create,
1431 .lookup = v9fs_vfs_lookup,
1432 .atomic_open = v9fs_vfs_atomic_open,
1433 .symlink = v9fs_vfs_symlink,
1434 .link = v9fs_vfs_link,
1435 .unlink = v9fs_vfs_unlink,
1436 .mkdir = v9fs_vfs_mkdir,
1437 .rmdir = v9fs_vfs_rmdir,
1438 .mknod = v9fs_vfs_mknod,
1439 .rename = v9fs_vfs_rename,
1440 .getattr = v9fs_vfs_getattr,
1441 .setattr = v9fs_vfs_setattr,
1442};
1443
1444static const struct inode_operations v9fs_dir_inode_operations = {
1445 .create = v9fs_vfs_create,
1446 .lookup = v9fs_vfs_lookup,
1447 .atomic_open = v9fs_vfs_atomic_open,
1448 .unlink = v9fs_vfs_unlink,
1449 .mkdir = v9fs_vfs_mkdir,
1450 .rmdir = v9fs_vfs_rmdir,
1451 .mknod = v9fs_vfs_mknod,
1452 .rename = v9fs_vfs_rename,
1453 .getattr = v9fs_vfs_getattr,
1454 .setattr = v9fs_vfs_setattr,
1455};
1456
1457static const struct inode_operations v9fs_file_inode_operations = {
1458 .getattr = v9fs_vfs_getattr,
1459 .setattr = v9fs_vfs_setattr,
1460};
1461
1462static const struct inode_operations v9fs_symlink_inode_operations = {
1463 .readlink = generic_readlink,
1464 .get_link = v9fs_vfs_get_link,
1465 .getattr = v9fs_vfs_getattr,
1466 .setattr = v9fs_vfs_setattr,
1467};
1468
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 & S_IALLUGO;
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 (extended) {
182 if (uflags & O_EXCL)
183 ret |= P9_OEXCL;
184
185 if (uflags & O_APPEND)
186 ret |= P9_OAPPEND;
187 }
188
189 return ret;
190}
191
192/**
193 * v9fs_blank_wstat - helper function to setup a 9P stat structure
194 * @wstat: structure to initialize
195 *
196 */
197
198void
199v9fs_blank_wstat(struct p9_wstat *wstat)
200{
201 wstat->type = ~0;
202 wstat->dev = ~0;
203 wstat->qid.type = ~0;
204 wstat->qid.version = ~0;
205 *((long long *)&wstat->qid.path) = ~0;
206 wstat->mode = ~0;
207 wstat->atime = ~0;
208 wstat->mtime = ~0;
209 wstat->length = ~0;
210 wstat->name = NULL;
211 wstat->uid = NULL;
212 wstat->gid = NULL;
213 wstat->muid = NULL;
214 wstat->n_uid = INVALID_UID;
215 wstat->n_gid = INVALID_GID;
216 wstat->n_muid = INVALID_UID;
217 wstat->extension = NULL;
218}
219
220/**
221 * v9fs_alloc_inode - helper function to allocate an inode
222 * @sb: The superblock to allocate the inode from
223 */
224struct inode *v9fs_alloc_inode(struct super_block *sb)
225{
226 struct v9fs_inode *v9inode;
227
228 v9inode = alloc_inode_sb(sb, v9fs_inode_cache, GFP_KERNEL);
229 if (!v9inode)
230 return NULL;
231 v9inode->cache_validity = 0;
232 mutex_init(&v9inode->v_mutex);
233 return &v9inode->netfs.inode;
234}
235
236/**
237 * v9fs_free_inode - destroy an inode
238 * @inode: The inode to be freed
239 */
240
241void v9fs_free_inode(struct inode *inode)
242{
243 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
244}
245
246/*
247 * Set parameters for the netfs library
248 */
249void v9fs_set_netfs_context(struct inode *inode)
250{
251 struct v9fs_inode *v9inode = V9FS_I(inode);
252 netfs_inode_init(&v9inode->netfs, &v9fs_req_ops, true);
253}
254
255int v9fs_init_inode(struct v9fs_session_info *v9ses,
256 struct inode *inode, umode_t mode, dev_t rdev)
257{
258 int err = 0;
259
260 inode_init_owner(&nop_mnt_idmap, inode, NULL, mode);
261 inode->i_blocks = 0;
262 inode->i_rdev = rdev;
263 simple_inode_init_ts(inode);
264 inode->i_mapping->a_ops = &v9fs_addr_operations;
265 inode->i_private = NULL;
266
267 switch (mode & S_IFMT) {
268 case S_IFIFO:
269 case S_IFBLK:
270 case S_IFCHR:
271 case S_IFSOCK:
272 if (v9fs_proto_dotl(v9ses)) {
273 inode->i_op = &v9fs_file_inode_operations_dotl;
274 } else if (v9fs_proto_dotu(v9ses)) {
275 inode->i_op = &v9fs_file_inode_operations;
276 } else {
277 p9_debug(P9_DEBUG_ERROR,
278 "special files without extended mode\n");
279 err = -EINVAL;
280 goto error;
281 }
282 init_special_inode(inode, inode->i_mode, inode->i_rdev);
283 break;
284 case S_IFREG:
285 if (v9fs_proto_dotl(v9ses)) {
286 inode->i_op = &v9fs_file_inode_operations_dotl;
287 inode->i_fop = &v9fs_file_operations_dotl;
288 } else {
289 inode->i_op = &v9fs_file_inode_operations;
290 inode->i_fop = &v9fs_file_operations;
291 }
292
293 break;
294 case S_IFLNK:
295 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
296 p9_debug(P9_DEBUG_ERROR,
297 "extended modes used with legacy protocol\n");
298 err = -EINVAL;
299 goto error;
300 }
301
302 if (v9fs_proto_dotl(v9ses))
303 inode->i_op = &v9fs_symlink_inode_operations_dotl;
304 else
305 inode->i_op = &v9fs_symlink_inode_operations;
306
307 break;
308 case S_IFDIR:
309 inc_nlink(inode);
310 if (v9fs_proto_dotl(v9ses))
311 inode->i_op = &v9fs_dir_inode_operations_dotl;
312 else if (v9fs_proto_dotu(v9ses))
313 inode->i_op = &v9fs_dir_inode_operations_dotu;
314 else
315 inode->i_op = &v9fs_dir_inode_operations;
316
317 if (v9fs_proto_dotl(v9ses))
318 inode->i_fop = &v9fs_dir_operations_dotl;
319 else
320 inode->i_fop = &v9fs_dir_operations;
321
322 break;
323 default:
324 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n",
325 mode, mode & S_IFMT);
326 err = -EINVAL;
327 goto error;
328 }
329error:
330 return err;
331
332}
333
334/**
335 * v9fs_get_inode - helper function to setup an inode
336 * @sb: superblock
337 * @mode: mode to setup inode with
338 * @rdev: The device numbers to set
339 */
340
341struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev)
342{
343 int err;
344 struct inode *inode;
345 struct v9fs_session_info *v9ses = sb->s_fs_info;
346
347 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode);
348
349 inode = new_inode(sb);
350 if (!inode) {
351 pr_warn("%s (%d): Problem allocating inode\n",
352 __func__, task_pid_nr(current));
353 return ERR_PTR(-ENOMEM);
354 }
355 err = v9fs_init_inode(v9ses, inode, mode, rdev);
356 if (err) {
357 iput(inode);
358 return ERR_PTR(err);
359 }
360 v9fs_set_netfs_context(inode);
361 return inode;
362}
363
364/**
365 * v9fs_evict_inode - Remove an inode from the inode cache
366 * @inode: inode to release
367 *
368 */
369void v9fs_evict_inode(struct inode *inode)
370{
371 struct v9fs_inode __maybe_unused *v9inode = V9FS_I(inode);
372 __le32 __maybe_unused version;
373
374 truncate_inode_pages_final(&inode->i_data);
375
376 version = cpu_to_le32(v9inode->qid.version);
377 netfs_clear_inode_writeback(inode, &version);
378
379 clear_inode(inode);
380 filemap_fdatawrite(&inode->i_data);
381
382#ifdef CONFIG_9P_FSCACHE
383 fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false);
384#endif
385}
386
387static int v9fs_test_inode(struct inode *inode, void *data)
388{
389 int umode;
390 dev_t rdev;
391 struct v9fs_inode *v9inode = V9FS_I(inode);
392 struct p9_wstat *st = (struct p9_wstat *)data;
393 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
394
395 umode = p9mode2unixmode(v9ses, st, &rdev);
396 /* don't match inode of different type */
397 if (inode_wrong_type(inode, umode))
398 return 0;
399
400 /* compare qid details */
401 if (memcmp(&v9inode->qid.version,
402 &st->qid.version, sizeof(v9inode->qid.version)))
403 return 0;
404
405 if (v9inode->qid.type != st->qid.type)
406 return 0;
407
408 if (v9inode->qid.path != st->qid.path)
409 return 0;
410 return 1;
411}
412
413static int v9fs_test_new_inode(struct inode *inode, void *data)
414{
415 return 0;
416}
417
418static int v9fs_set_inode(struct inode *inode, void *data)
419{
420 struct v9fs_inode *v9inode = V9FS_I(inode);
421 struct p9_wstat *st = (struct p9_wstat *)data;
422
423 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
424 return 0;
425}
426
427static struct inode *v9fs_qid_iget(struct super_block *sb,
428 struct p9_qid *qid,
429 struct p9_wstat *st,
430 int new)
431{
432 dev_t rdev;
433 int retval;
434 umode_t umode;
435 unsigned long i_ino;
436 struct inode *inode;
437 struct v9fs_session_info *v9ses = sb->s_fs_info;
438 int (*test)(struct inode *inode, void *data);
439
440 if (new)
441 test = v9fs_test_new_inode;
442 else
443 test = v9fs_test_inode;
444
445 i_ino = v9fs_qid2ino(qid);
446 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
447 if (!inode)
448 return ERR_PTR(-ENOMEM);
449 if (!(inode->i_state & I_NEW))
450 return inode;
451 /*
452 * initialize the inode with the stat info
453 * FIXME!! we may need support for stale inodes
454 * later.
455 */
456 inode->i_ino = i_ino;
457 umode = p9mode2unixmode(v9ses, st, &rdev);
458 retval = v9fs_init_inode(v9ses, inode, umode, rdev);
459 if (retval)
460 goto error;
461
462 v9fs_stat2inode(st, inode, sb, 0);
463 v9fs_set_netfs_context(inode);
464 v9fs_cache_inode_get_cookie(inode);
465 unlock_new_inode(inode);
466 return inode;
467error:
468 iget_failed(inode);
469 return ERR_PTR(retval);
470
471}
472
473struct inode *
474v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
475 struct super_block *sb, int new)
476{
477 struct p9_wstat *st;
478 struct inode *inode = NULL;
479
480 st = p9_client_stat(fid);
481 if (IS_ERR(st))
482 return ERR_CAST(st);
483
484 inode = v9fs_qid_iget(sb, &st->qid, st, new);
485 p9stat_free(st);
486 kfree(st);
487 return inode;
488}
489
490/**
491 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
492 * plan 9 AT flag.
493 * @flags: flags to convert
494 */
495static int v9fs_at_to_dotl_flags(int flags)
496{
497 int rflags = 0;
498
499 if (flags & AT_REMOVEDIR)
500 rflags |= P9_DOTL_AT_REMOVEDIR;
501
502 return rflags;
503}
504
505/**
506 * v9fs_dec_count - helper functon to drop i_nlink.
507 *
508 * If a directory had nlink <= 2 (including . and ..), then we should not drop
509 * the link count, which indicates the underlying exported fs doesn't maintain
510 * nlink accurately. e.g.
511 * - overlayfs sets nlink to 1 for merged dir
512 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more
513 * than EXT4_LINK_MAX (65000) links.
514 *
515 * @inode: inode whose nlink is being dropped
516 */
517static void v9fs_dec_count(struct inode *inode)
518{
519 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2)
520 drop_nlink(inode);
521}
522
523/**
524 * v9fs_remove - helper function to remove files and directories
525 * @dir: directory inode that is being deleted
526 * @dentry: dentry that is being deleted
527 * @flags: removing a directory
528 *
529 */
530
531static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
532{
533 struct inode *inode;
534 int retval = -EOPNOTSUPP;
535 struct p9_fid *v9fid, *dfid;
536 struct v9fs_session_info *v9ses;
537
538 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
539 dir, dentry, flags);
540
541 v9ses = v9fs_inode2v9ses(dir);
542 inode = d_inode(dentry);
543 dfid = v9fs_parent_fid(dentry);
544 if (IS_ERR(dfid)) {
545 retval = PTR_ERR(dfid);
546 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
547 return retval;
548 }
549 if (v9fs_proto_dotl(v9ses))
550 retval = p9_client_unlinkat(dfid, dentry->d_name.name,
551 v9fs_at_to_dotl_flags(flags));
552 p9_fid_put(dfid);
553 if (retval == -EOPNOTSUPP) {
554 /* Try the one based on path */
555 v9fid = v9fs_fid_clone(dentry);
556 if (IS_ERR(v9fid))
557 return PTR_ERR(v9fid);
558 retval = p9_client_remove(v9fid);
559 }
560 if (!retval) {
561 /*
562 * directories on unlink should have zero
563 * link count
564 */
565 if (flags & AT_REMOVEDIR) {
566 clear_nlink(inode);
567 v9fs_dec_count(dir);
568 } else
569 v9fs_dec_count(inode);
570
571 v9fs_invalidate_inode_attr(inode);
572 v9fs_invalidate_inode_attr(dir);
573
574 /* invalidate all fids associated with dentry */
575 /* NOTE: This will not include open fids */
576 dentry->d_op->d_release(dentry);
577 }
578 return retval;
579}
580
581/**
582 * v9fs_create - Create a file
583 * @v9ses: session information
584 * @dir: directory that dentry is being created in
585 * @dentry: dentry that is being created
586 * @extension: 9p2000.u extension string to support devices, etc.
587 * @perm: create permissions
588 * @mode: open mode
589 *
590 */
591static struct p9_fid *
592v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
593 struct dentry *dentry, char *extension, u32 perm, u8 mode)
594{
595 int err;
596 const unsigned char *name;
597 struct p9_fid *dfid, *ofid = NULL, *fid = NULL;
598 struct inode *inode;
599
600 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
601
602 name = dentry->d_name.name;
603 dfid = v9fs_parent_fid(dentry);
604 if (IS_ERR(dfid)) {
605 err = PTR_ERR(dfid);
606 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
607 return ERR_PTR(err);
608 }
609
610 /* clone a fid to use for creation */
611 ofid = clone_fid(dfid);
612 if (IS_ERR(ofid)) {
613 err = PTR_ERR(ofid);
614 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
615 goto error;
616 }
617
618 err = p9_client_fcreate(ofid, name, perm, mode, extension);
619 if (err < 0) {
620 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
621 goto error;
622 }
623
624 if (!(perm & P9_DMLINK)) {
625 /* now walk from the parent so we can get unopened fid */
626 fid = p9_client_walk(dfid, 1, &name, 1);
627 if (IS_ERR(fid)) {
628 err = PTR_ERR(fid);
629 p9_debug(P9_DEBUG_VFS,
630 "p9_client_walk failed %d\n", err);
631 goto error;
632 }
633 /*
634 * instantiate inode and assign the unopened fid to the dentry
635 */
636 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
637 if (IS_ERR(inode)) {
638 err = PTR_ERR(inode);
639 p9_debug(P9_DEBUG_VFS,
640 "inode creation failed %d\n", err);
641 goto error;
642 }
643 v9fs_fid_add(dentry, &fid);
644 d_instantiate(dentry, inode);
645 }
646 p9_fid_put(dfid);
647 return ofid;
648error:
649 p9_fid_put(dfid);
650 p9_fid_put(ofid);
651 p9_fid_put(fid);
652 return ERR_PTR(err);
653}
654
655/**
656 * v9fs_vfs_create - VFS hook to create a regular file
657 * @idmap: idmap of the mount
658 * @dir: The parent directory
659 * @dentry: The name of file to be created
660 * @mode: The UNIX file mode to set
661 * @excl: True if the file must not yet exist
662 *
663 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called
664 * for mknod(2).
665 *
666 */
667
668static int
669v9fs_vfs_create(struct mnt_idmap *idmap, struct inode *dir,
670 struct dentry *dentry, umode_t mode, bool excl)
671{
672 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
673 u32 perm = unixmode2p9mode(v9ses, mode);
674 struct p9_fid *fid;
675
676 /* P9_OEXCL? */
677 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR);
678 if (IS_ERR(fid))
679 return PTR_ERR(fid);
680
681 v9fs_invalidate_inode_attr(dir);
682 p9_fid_put(fid);
683
684 return 0;
685}
686
687/**
688 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
689 * @idmap: idmap of the mount
690 * @dir: inode that is being unlinked
691 * @dentry: dentry that is being unlinked
692 * @mode: mode for new directory
693 *
694 */
695
696static int v9fs_vfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
697 struct dentry *dentry, umode_t mode)
698{
699 int err;
700 u32 perm;
701 struct p9_fid *fid;
702 struct v9fs_session_info *v9ses;
703
704 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
705 err = 0;
706 v9ses = v9fs_inode2v9ses(dir);
707 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
708 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
709 if (IS_ERR(fid)) {
710 err = PTR_ERR(fid);
711 fid = NULL;
712 } else {
713 inc_nlink(dir);
714 v9fs_invalidate_inode_attr(dir);
715 }
716
717 if (fid)
718 p9_fid_put(fid);
719
720 return err;
721}
722
723/**
724 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
725 * @dir: inode that is being walked from
726 * @dentry: dentry that is being walked to?
727 * @flags: lookup flags (unused)
728 *
729 */
730
731struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
732 unsigned int flags)
733{
734 struct dentry *res;
735 struct v9fs_session_info *v9ses;
736 struct p9_fid *dfid, *fid;
737 struct inode *inode;
738 const unsigned char *name;
739
740 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n",
741 dir, dentry, dentry, flags);
742
743 if (dentry->d_name.len > NAME_MAX)
744 return ERR_PTR(-ENAMETOOLONG);
745
746 v9ses = v9fs_inode2v9ses(dir);
747 /* We can walk d_parent because we hold the dir->i_mutex */
748 dfid = v9fs_parent_fid(dentry);
749 if (IS_ERR(dfid))
750 return ERR_CAST(dfid);
751
752 /*
753 * Make sure we don't use a wrong inode due to parallel
754 * unlink. For cached mode create calls request for new
755 * inode. But with cache disabled, lookup should do this.
756 */
757 name = dentry->d_name.name;
758 fid = p9_client_walk(dfid, 1, &name, 1);
759 p9_fid_put(dfid);
760 if (fid == ERR_PTR(-ENOENT))
761 inode = NULL;
762 else if (IS_ERR(fid))
763 inode = ERR_CAST(fid);
764 else if (v9ses->cache & (CACHE_META|CACHE_LOOSE))
765 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
766 else
767 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
768 /*
769 * If we had a rename on the server and a parallel lookup
770 * for the new name, then make sure we instantiate with
771 * the new name. ie look up for a/b, while on server somebody
772 * moved b under k and client parallely did a lookup for
773 * k/b.
774 */
775 res = d_splice_alias(inode, dentry);
776 if (!IS_ERR(fid)) {
777 if (!res)
778 v9fs_fid_add(dentry, &fid);
779 else if (!IS_ERR(res))
780 v9fs_fid_add(res, &fid);
781 else
782 p9_fid_put(fid);
783 }
784 return res;
785}
786
787static int
788v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
789 struct file *file, unsigned int flags, umode_t mode)
790{
791 int err;
792 u32 perm;
793 struct v9fs_inode __maybe_unused *v9inode;
794 struct v9fs_session_info *v9ses;
795 struct p9_fid *fid;
796 struct dentry *res = NULL;
797 struct inode *inode;
798 int p9_omode;
799
800 if (d_in_lookup(dentry)) {
801 res = v9fs_vfs_lookup(dir, dentry, 0);
802 if (IS_ERR(res))
803 return PTR_ERR(res);
804
805 if (res)
806 dentry = res;
807 }
808
809 /* Only creates */
810 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
811 return finish_no_open(file, res);
812
813 v9ses = v9fs_inode2v9ses(dir);
814 perm = unixmode2p9mode(v9ses, mode);
815 p9_omode = v9fs_uflags2omode(flags, v9fs_proto_dotu(v9ses));
816
817 if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) {
818 p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR;
819 p9_debug(P9_DEBUG_CACHE,
820 "write-only file with writeback enabled, creating w/ O_RDWR\n");
821 }
822 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, p9_omode);
823 if (IS_ERR(fid)) {
824 err = PTR_ERR(fid);
825 goto error;
826 }
827
828 v9fs_invalidate_inode_attr(dir);
829 inode = d_inode(dentry);
830 v9inode = V9FS_I(inode);
831 err = finish_open(file, dentry, generic_file_open);
832 if (err)
833 goto error;
834
835 file->private_data = fid;
836#ifdef CONFIG_9P_FSCACHE
837 if (v9ses->cache & CACHE_FSCACHE)
838 fscache_use_cookie(v9fs_inode_cookie(v9inode),
839 file->f_mode & FMODE_WRITE);
840#endif
841
842 v9fs_fid_add_modes(fid, v9ses->flags, v9ses->cache, file->f_flags);
843 v9fs_open_fid_add(inode, &fid);
844
845 file->f_mode |= FMODE_CREATED;
846out:
847 dput(res);
848 return err;
849
850error:
851 p9_fid_put(fid);
852 goto out;
853}
854
855/**
856 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
857 * @i: inode that is being unlinked
858 * @d: dentry that is being unlinked
859 *
860 */
861
862int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
863{
864 return v9fs_remove(i, d, 0);
865}
866
867/**
868 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
869 * @i: inode that is being unlinked
870 * @d: dentry that is being unlinked
871 *
872 */
873
874int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
875{
876 return v9fs_remove(i, d, AT_REMOVEDIR);
877}
878
879/**
880 * v9fs_vfs_rename - VFS hook to rename an inode
881 * @idmap: The idmap of the mount
882 * @old_dir: old dir inode
883 * @old_dentry: old dentry
884 * @new_dir: new dir inode
885 * @new_dentry: new dentry
886 * @flags: RENAME_* flags
887 *
888 */
889
890int
891v9fs_vfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
892 struct dentry *old_dentry, struct inode *new_dir,
893 struct dentry *new_dentry, unsigned int flags)
894{
895 int retval;
896 struct inode *old_inode;
897 struct inode *new_inode;
898 struct v9fs_session_info *v9ses;
899 struct p9_fid *oldfid = NULL, *dfid = NULL;
900 struct p9_fid *olddirfid = NULL;
901 struct p9_fid *newdirfid = NULL;
902 struct p9_wstat wstat;
903
904 if (flags)
905 return -EINVAL;
906
907 p9_debug(P9_DEBUG_VFS, "\n");
908 old_inode = d_inode(old_dentry);
909 new_inode = d_inode(new_dentry);
910 v9ses = v9fs_inode2v9ses(old_inode);
911 oldfid = v9fs_fid_lookup(old_dentry);
912 if (IS_ERR(oldfid))
913 return PTR_ERR(oldfid);
914
915 dfid = v9fs_parent_fid(old_dentry);
916 olddirfid = clone_fid(dfid);
917 p9_fid_put(dfid);
918 dfid = NULL;
919
920 if (IS_ERR(olddirfid)) {
921 retval = PTR_ERR(olddirfid);
922 goto error;
923 }
924
925 dfid = v9fs_parent_fid(new_dentry);
926 newdirfid = clone_fid(dfid);
927 p9_fid_put(dfid);
928 dfid = NULL;
929
930 if (IS_ERR(newdirfid)) {
931 retval = PTR_ERR(newdirfid);
932 goto error;
933 }
934
935 down_write(&v9ses->rename_sem);
936 if (v9fs_proto_dotl(v9ses)) {
937 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
938 newdirfid, new_dentry->d_name.name);
939 if (retval == -EOPNOTSUPP)
940 retval = p9_client_rename(oldfid, newdirfid,
941 new_dentry->d_name.name);
942 if (retval != -EOPNOTSUPP)
943 goto error_locked;
944 }
945 if (old_dentry->d_parent != new_dentry->d_parent) {
946 /*
947 * 9P .u can only handle file rename in the same directory
948 */
949
950 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
951 retval = -EXDEV;
952 goto error_locked;
953 }
954 v9fs_blank_wstat(&wstat);
955 wstat.muid = v9ses->uname;
956 wstat.name = new_dentry->d_name.name;
957 retval = p9_client_wstat(oldfid, &wstat);
958
959error_locked:
960 if (!retval) {
961 if (new_inode) {
962 if (S_ISDIR(new_inode->i_mode))
963 clear_nlink(new_inode);
964 else
965 v9fs_dec_count(new_inode);
966 }
967 if (S_ISDIR(old_inode->i_mode)) {
968 if (!new_inode)
969 inc_nlink(new_dir);
970 v9fs_dec_count(old_dir);
971 }
972 v9fs_invalidate_inode_attr(old_inode);
973 v9fs_invalidate_inode_attr(old_dir);
974 v9fs_invalidate_inode_attr(new_dir);
975
976 /* successful rename */
977 d_move(old_dentry, new_dentry);
978 }
979 up_write(&v9ses->rename_sem);
980
981error:
982 p9_fid_put(newdirfid);
983 p9_fid_put(olddirfid);
984 p9_fid_put(oldfid);
985 return retval;
986}
987
988/**
989 * v9fs_vfs_getattr - retrieve file metadata
990 * @idmap: idmap of the mount
991 * @path: Object to query
992 * @stat: metadata structure to populate
993 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
994 * @flags: AT_STATX_xxx setting
995 *
996 */
997
998static int
999v9fs_vfs_getattr(struct mnt_idmap *idmap, const struct path *path,
1000 struct kstat *stat, u32 request_mask, unsigned int flags)
1001{
1002 struct dentry *dentry = path->dentry;
1003 struct inode *inode = d_inode(dentry);
1004 struct v9fs_session_info *v9ses;
1005 struct p9_fid *fid;
1006 struct p9_wstat *st;
1007
1008 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1009 v9ses = v9fs_dentry2v9ses(dentry);
1010 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
1011 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
1012 return 0;
1013 } else if (v9ses->cache & CACHE_WRITEBACK) {
1014 if (S_ISREG(inode->i_mode)) {
1015 int retval = filemap_fdatawrite(inode->i_mapping);
1016
1017 if (retval)
1018 p9_debug(P9_DEBUG_ERROR,
1019 "flushing writeback during getattr returned %d\n", retval);
1020 }
1021 }
1022 fid = v9fs_fid_lookup(dentry);
1023 if (IS_ERR(fid))
1024 return PTR_ERR(fid);
1025
1026 st = p9_client_stat(fid);
1027 p9_fid_put(fid);
1028 if (IS_ERR(st))
1029 return PTR_ERR(st);
1030
1031 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0);
1032 generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat);
1033
1034 p9stat_free(st);
1035 kfree(st);
1036 return 0;
1037}
1038
1039/**
1040 * v9fs_vfs_setattr - set file metadata
1041 * @idmap: idmap of the mount
1042 * @dentry: file whose metadata to set
1043 * @iattr: metadata assignment structure
1044 *
1045 */
1046
1047static int v9fs_vfs_setattr(struct mnt_idmap *idmap,
1048 struct dentry *dentry, struct iattr *iattr)
1049{
1050 int retval, use_dentry = 0;
1051 struct inode *inode = d_inode(dentry);
1052 struct v9fs_session_info *v9ses;
1053 struct p9_fid *fid = NULL;
1054 struct p9_wstat wstat;
1055
1056 p9_debug(P9_DEBUG_VFS, "\n");
1057 retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
1058 if (retval)
1059 return retval;
1060
1061 v9ses = v9fs_dentry2v9ses(dentry);
1062 if (iattr->ia_valid & ATTR_FILE) {
1063 fid = iattr->ia_file->private_data;
1064 WARN_ON(!fid);
1065 }
1066 if (!fid) {
1067 fid = v9fs_fid_lookup(dentry);
1068 use_dentry = 1;
1069 }
1070 if (IS_ERR(fid))
1071 return PTR_ERR(fid);
1072
1073 v9fs_blank_wstat(&wstat);
1074 if (iattr->ia_valid & ATTR_MODE)
1075 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1076
1077 if (iattr->ia_valid & ATTR_MTIME)
1078 wstat.mtime = iattr->ia_mtime.tv_sec;
1079
1080 if (iattr->ia_valid & ATTR_ATIME)
1081 wstat.atime = iattr->ia_atime.tv_sec;
1082
1083 if (iattr->ia_valid & ATTR_SIZE)
1084 wstat.length = iattr->ia_size;
1085
1086 if (v9fs_proto_dotu(v9ses)) {
1087 if (iattr->ia_valid & ATTR_UID)
1088 wstat.n_uid = iattr->ia_uid;
1089
1090 if (iattr->ia_valid & ATTR_GID)
1091 wstat.n_gid = iattr->ia_gid;
1092 }
1093
1094 /* Write all dirty data */
1095 if (d_is_reg(dentry)) {
1096 retval = filemap_fdatawrite(inode->i_mapping);
1097 if (retval)
1098 p9_debug(P9_DEBUG_ERROR,
1099 "flushing writeback during setattr returned %d\n", retval);
1100 }
1101
1102 retval = p9_client_wstat(fid, &wstat);
1103
1104 if (use_dentry)
1105 p9_fid_put(fid);
1106
1107 if (retval < 0)
1108 return retval;
1109
1110 if ((iattr->ia_valid & ATTR_SIZE) &&
1111 iattr->ia_size != i_size_read(inode)) {
1112 truncate_setsize(inode, iattr->ia_size);
1113 netfs_resize_file(netfs_inode(inode), iattr->ia_size, true);
1114
1115#ifdef CONFIG_9P_FSCACHE
1116 if (v9ses->cache & CACHE_FSCACHE) {
1117 struct v9fs_inode *v9inode = V9FS_I(inode);
1118
1119 fscache_resize_cookie(v9fs_inode_cookie(v9inode), iattr->ia_size);
1120 }
1121#endif
1122 }
1123
1124 v9fs_invalidate_inode_attr(inode);
1125
1126 setattr_copy(&nop_mnt_idmap, inode, iattr);
1127 mark_inode_dirty(inode);
1128 return 0;
1129}
1130
1131/**
1132 * v9fs_stat2inode - populate an inode structure with mistat info
1133 * @stat: Plan 9 metadata (mistat) structure
1134 * @inode: inode to populate
1135 * @sb: superblock of filesystem
1136 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
1137 *
1138 */
1139
1140void
1141v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1142 struct super_block *sb, unsigned int flags)
1143{
1144 umode_t mode;
1145 struct v9fs_session_info *v9ses = sb->s_fs_info;
1146 struct v9fs_inode *v9inode = V9FS_I(inode);
1147
1148 set_nlink(inode, 1);
1149
1150 inode_set_atime(inode, stat->atime, 0);
1151 inode_set_mtime(inode, stat->mtime, 0);
1152 inode_set_ctime(inode, stat->mtime, 0);
1153
1154 inode->i_uid = v9ses->dfltuid;
1155 inode->i_gid = v9ses->dfltgid;
1156
1157 if (v9fs_proto_dotu(v9ses)) {
1158 inode->i_uid = stat->n_uid;
1159 inode->i_gid = stat->n_gid;
1160 }
1161 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1162 if (v9fs_proto_dotu(v9ses)) {
1163 unsigned int i_nlink;
1164 /*
1165 * Hadlink support got added later to the .u extension.
1166 * So there can be a server out there that doesn't
1167 * support this even with .u extension. That would
1168 * just leave us with stat->extension being an empty
1169 * string, though.
1170 */
1171 /* HARDLINKCOUNT %u */
1172 if (sscanf(stat->extension,
1173 " HARDLINKCOUNT %u", &i_nlink) == 1)
1174 set_nlink(inode, i_nlink);
1175 }
1176 }
1177 mode = p9mode2perm(v9ses, stat);
1178 mode |= inode->i_mode & ~S_IALLUGO;
1179 inode->i_mode = mode;
1180
1181 v9inode->netfs.remote_i_size = stat->length;
1182 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
1183 v9fs_i_size_write(inode, stat->length);
1184 /* not real number of blocks, but 512 byte ones ... */
1185 inode->i_blocks = (stat->length + 512 - 1) >> 9;
1186 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1187}
1188
1189/**
1190 * v9fs_qid2ino - convert qid into inode number
1191 * @qid: qid to hash
1192 *
1193 * BUG: potential for inode number collisions?
1194 */
1195
1196ino_t v9fs_qid2ino(struct p9_qid *qid)
1197{
1198 u64 path = qid->path + 2;
1199 ino_t i = 0;
1200
1201 if (sizeof(ino_t) == sizeof(path))
1202 memcpy(&i, &path, sizeof(ino_t));
1203 else
1204 i = (ino_t) (path ^ (path >> 32));
1205
1206 return i;
1207}
1208
1209/**
1210 * v9fs_vfs_get_link - follow a symlink path
1211 * @dentry: dentry for symlink
1212 * @inode: inode for symlink
1213 * @done: delayed call for when we are done with the return value
1214 */
1215
1216static const char *v9fs_vfs_get_link(struct dentry *dentry,
1217 struct inode *inode,
1218 struct delayed_call *done)
1219{
1220 struct v9fs_session_info *v9ses;
1221 struct p9_fid *fid;
1222 struct p9_wstat *st;
1223 char *res;
1224
1225 if (!dentry)
1226 return ERR_PTR(-ECHILD);
1227
1228 v9ses = v9fs_dentry2v9ses(dentry);
1229 if (!v9fs_proto_dotu(v9ses))
1230 return ERR_PTR(-EBADF);
1231
1232 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
1233 fid = v9fs_fid_lookup(dentry);
1234
1235 if (IS_ERR(fid))
1236 return ERR_CAST(fid);
1237
1238 st = p9_client_stat(fid);
1239 p9_fid_put(fid);
1240 if (IS_ERR(st))
1241 return ERR_CAST(st);
1242
1243 if (!(st->mode & P9_DMSYMLINK)) {
1244 p9stat_free(st);
1245 kfree(st);
1246 return ERR_PTR(-EINVAL);
1247 }
1248 res = st->extension;
1249 st->extension = NULL;
1250 if (strlen(res) >= PATH_MAX)
1251 res[PATH_MAX - 1] = '\0';
1252
1253 p9stat_free(st);
1254 kfree(st);
1255 set_delayed_call(done, kfree_link, res);
1256 return res;
1257}
1258
1259/**
1260 * v9fs_vfs_mkspecial - create a special file
1261 * @dir: inode to create special file in
1262 * @dentry: dentry to create
1263 * @perm: mode to create special file
1264 * @extension: 9p2000.u format extension string representing special file
1265 *
1266 */
1267
1268static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1269 u32 perm, const char *extension)
1270{
1271 struct p9_fid *fid;
1272 struct v9fs_session_info *v9ses;
1273
1274 v9ses = v9fs_inode2v9ses(dir);
1275 if (!v9fs_proto_dotu(v9ses)) {
1276 p9_debug(P9_DEBUG_ERROR, "not extended\n");
1277 return -EPERM;
1278 }
1279
1280 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1281 P9_OREAD);
1282 if (IS_ERR(fid))
1283 return PTR_ERR(fid);
1284
1285 v9fs_invalidate_inode_attr(dir);
1286 p9_fid_put(fid);
1287 return 0;
1288}
1289
1290/**
1291 * v9fs_vfs_symlink - helper function to create symlinks
1292 * @idmap: idmap of the mount
1293 * @dir: directory inode containing symlink
1294 * @dentry: dentry for symlink
1295 * @symname: symlink data
1296 *
1297 * See Also: 9P2000.u RFC for more information
1298 *
1299 */
1300
1301static int
1302v9fs_vfs_symlink(struct mnt_idmap *idmap, struct inode *dir,
1303 struct dentry *dentry, const char *symname)
1304{
1305 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n",
1306 dir->i_ino, dentry, symname);
1307
1308 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname);
1309}
1310
1311#define U32_MAX_DIGITS 10
1312
1313/**
1314 * v9fs_vfs_link - create a hardlink
1315 * @old_dentry: dentry for file to link to
1316 * @dir: inode destination for new link
1317 * @dentry: dentry for link
1318 *
1319 */
1320
1321static int
1322v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1323 struct dentry *dentry)
1324{
1325 int retval;
1326 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */
1327 struct p9_fid *oldfid;
1328
1329 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n",
1330 dir->i_ino, dentry, old_dentry);
1331
1332 oldfid = v9fs_fid_clone(old_dentry);
1333 if (IS_ERR(oldfid))
1334 return PTR_ERR(oldfid);
1335
1336 sprintf(name, "%d\n", oldfid->fid);
1337 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1338 if (!retval) {
1339 v9fs_refresh_inode(oldfid, d_inode(old_dentry));
1340 v9fs_invalidate_inode_attr(dir);
1341 }
1342 p9_fid_put(oldfid);
1343 return retval;
1344}
1345
1346/**
1347 * v9fs_vfs_mknod - create a special file
1348 * @idmap: idmap of the mount
1349 * @dir: inode destination for new link
1350 * @dentry: dentry for file
1351 * @mode: mode for creation
1352 * @rdev: device associated with special file
1353 *
1354 */
1355
1356static int
1357v9fs_vfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
1358 struct dentry *dentry, umode_t mode, dev_t rdev)
1359{
1360 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1361 int retval;
1362 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1];
1363 u32 perm;
1364
1365 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
1366 dir->i_ino, dentry, mode,
1367 MAJOR(rdev), MINOR(rdev));
1368
1369 /* build extension */
1370 if (S_ISBLK(mode))
1371 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1372 else if (S_ISCHR(mode))
1373 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1374 else
1375 *name = 0;
1376
1377 perm = unixmode2p9mode(v9ses, mode);
1378 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name);
1379
1380 return retval;
1381}
1382
1383int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1384{
1385 int umode;
1386 dev_t rdev;
1387 struct p9_wstat *st;
1388 struct v9fs_session_info *v9ses;
1389 unsigned int flags;
1390
1391 v9ses = v9fs_inode2v9ses(inode);
1392 st = p9_client_stat(fid);
1393 if (IS_ERR(st))
1394 return PTR_ERR(st);
1395 /*
1396 * Don't update inode if the file type is different
1397 */
1398 umode = p9mode2unixmode(v9ses, st, &rdev);
1399 if (inode_wrong_type(inode, umode))
1400 goto out;
1401
1402 /*
1403 * We don't want to refresh inode->i_size,
1404 * because we may have cached data
1405 */
1406 flags = (v9ses->cache & CACHE_LOOSE) ?
1407 V9FS_STAT2INODE_KEEP_ISIZE : 0;
1408 v9fs_stat2inode(st, inode, inode->i_sb, flags);
1409out:
1410 p9stat_free(st);
1411 kfree(st);
1412 return 0;
1413}
1414
1415static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1416 .create = v9fs_vfs_create,
1417 .lookup = v9fs_vfs_lookup,
1418 .atomic_open = v9fs_vfs_atomic_open,
1419 .symlink = v9fs_vfs_symlink,
1420 .link = v9fs_vfs_link,
1421 .unlink = v9fs_vfs_unlink,
1422 .mkdir = v9fs_vfs_mkdir,
1423 .rmdir = v9fs_vfs_rmdir,
1424 .mknod = v9fs_vfs_mknod,
1425 .rename = v9fs_vfs_rename,
1426 .getattr = v9fs_vfs_getattr,
1427 .setattr = v9fs_vfs_setattr,
1428};
1429
1430static const struct inode_operations v9fs_dir_inode_operations = {
1431 .create = v9fs_vfs_create,
1432 .lookup = v9fs_vfs_lookup,
1433 .atomic_open = v9fs_vfs_atomic_open,
1434 .unlink = v9fs_vfs_unlink,
1435 .mkdir = v9fs_vfs_mkdir,
1436 .rmdir = v9fs_vfs_rmdir,
1437 .mknod = v9fs_vfs_mknod,
1438 .rename = v9fs_vfs_rename,
1439 .getattr = v9fs_vfs_getattr,
1440 .setattr = v9fs_vfs_setattr,
1441};
1442
1443static const struct inode_operations v9fs_file_inode_operations = {
1444 .getattr = v9fs_vfs_getattr,
1445 .setattr = v9fs_vfs_setattr,
1446};
1447
1448static const struct inode_operations v9fs_symlink_inode_operations = {
1449 .get_link = v9fs_vfs_get_link,
1450 .getattr = v9fs_vfs_getattr,
1451 .setattr = v9fs_vfs_setattr,
1452};
1453