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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 strncpy(ext, stat->extension, sizeof(ext));
150 sscanf(ext, "%c %u %u", &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 (uflags & O_TRUNC)
196 ret |= P9_OTRUNC;
197
198 if (extended) {
199 if (uflags & O_EXCL)
200 ret |= P9_OEXCL;
201
202 if (uflags & O_APPEND)
203 ret |= P9_OAPPEND;
204 }
205
206 return ret;
207}
208
209/**
210 * v9fs_blank_wstat - helper function to setup a 9P stat structure
211 * @wstat: structure to initialize
212 *
213 */
214
215void
216v9fs_blank_wstat(struct p9_wstat *wstat)
217{
218 wstat->type = ~0;
219 wstat->dev = ~0;
220 wstat->qid.type = ~0;
221 wstat->qid.version = ~0;
222 *((long long *)&wstat->qid.path) = ~0;
223 wstat->mode = ~0;
224 wstat->atime = ~0;
225 wstat->mtime = ~0;
226 wstat->length = ~0;
227 wstat->name = NULL;
228 wstat->uid = NULL;
229 wstat->gid = NULL;
230 wstat->muid = NULL;
231 wstat->n_uid = ~0;
232 wstat->n_gid = ~0;
233 wstat->n_muid = ~0;
234 wstat->extension = NULL;
235}
236
237/**
238 * v9fs_alloc_inode - helper function to allocate an inode
239 *
240 */
241struct inode *v9fs_alloc_inode(struct super_block *sb)
242{
243 struct v9fs_inode *v9inode;
244 v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache,
245 GFP_KERNEL);
246 if (!v9inode)
247 return NULL;
248#ifdef CONFIG_9P_FSCACHE
249 v9inode->fscache = NULL;
250 spin_lock_init(&v9inode->fscache_lock);
251#endif
252 v9inode->writeback_fid = NULL;
253 v9inode->cache_validity = 0;
254 mutex_init(&v9inode->v_mutex);
255 return &v9inode->vfs_inode;
256}
257
258/**
259 * v9fs_destroy_inode - destroy an inode
260 *
261 */
262
263static void v9fs_i_callback(struct rcu_head *head)
264{
265 struct inode *inode = container_of(head, struct inode, i_rcu);
266 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
267}
268
269void v9fs_destroy_inode(struct inode *inode)
270{
271 call_rcu(&inode->i_rcu, v9fs_i_callback);
272}
273
274int v9fs_init_inode(struct v9fs_session_info *v9ses,
275 struct inode *inode, umode_t mode, dev_t rdev)
276{
277 int err = 0;
278
279 inode_init_owner(inode, NULL, mode);
280 inode->i_blocks = 0;
281 inode->i_rdev = rdev;
282 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
283 inode->i_mapping->a_ops = &v9fs_addr_operations;
284
285 switch (mode & S_IFMT) {
286 case S_IFIFO:
287 case S_IFBLK:
288 case S_IFCHR:
289 case S_IFSOCK:
290 if (v9fs_proto_dotl(v9ses)) {
291 inode->i_op = &v9fs_file_inode_operations_dotl;
292 } else if (v9fs_proto_dotu(v9ses)) {
293 inode->i_op = &v9fs_file_inode_operations;
294 } else {
295 p9_debug(P9_DEBUG_ERROR,
296 "special files without extended mode\n");
297 err = -EINVAL;
298 goto error;
299 }
300 init_special_inode(inode, inode->i_mode, inode->i_rdev);
301 break;
302 case S_IFREG:
303 if (v9fs_proto_dotl(v9ses)) {
304 inode->i_op = &v9fs_file_inode_operations_dotl;
305 if (v9ses->cache)
306 inode->i_fop =
307 &v9fs_cached_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)
313 inode->i_fop = &v9fs_cached_file_operations;
314 else
315 inode->i_fop = &v9fs_file_operations;
316 }
317
318 break;
319 case S_IFLNK:
320 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
321 p9_debug(P9_DEBUG_ERROR,
322 "extended modes used with legacy protocol\n");
323 err = -EINVAL;
324 goto error;
325 }
326
327 if (v9fs_proto_dotl(v9ses))
328 inode->i_op = &v9fs_symlink_inode_operations_dotl;
329 else
330 inode->i_op = &v9fs_symlink_inode_operations;
331
332 break;
333 case S_IFDIR:
334 inc_nlink(inode);
335 if (v9fs_proto_dotl(v9ses))
336 inode->i_op = &v9fs_dir_inode_operations_dotl;
337 else if (v9fs_proto_dotu(v9ses))
338 inode->i_op = &v9fs_dir_inode_operations_dotu;
339 else
340 inode->i_op = &v9fs_dir_inode_operations;
341
342 if (v9fs_proto_dotl(v9ses))
343 inode->i_fop = &v9fs_dir_operations_dotl;
344 else
345 inode->i_fop = &v9fs_dir_operations;
346
347 break;
348 default:
349 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n",
350 mode, mode & S_IFMT);
351 err = -EINVAL;
352 goto error;
353 }
354error:
355 return err;
356
357}
358
359/**
360 * v9fs_get_inode - helper function to setup an inode
361 * @sb: superblock
362 * @mode: mode to setup inode with
363 *
364 */
365
366struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev)
367{
368 int err;
369 struct inode *inode;
370 struct v9fs_session_info *v9ses = sb->s_fs_info;
371
372 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode);
373
374 inode = new_inode(sb);
375 if (!inode) {
376 pr_warn("%s (%d): Problem allocating inode\n",
377 __func__, task_pid_nr(current));
378 return ERR_PTR(-ENOMEM);
379 }
380 err = v9fs_init_inode(v9ses, inode, mode, rdev);
381 if (err) {
382 iput(inode);
383 return ERR_PTR(err);
384 }
385 return inode;
386}
387
388/*
389static struct v9fs_fid*
390v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
391{
392 int err;
393 int nfid;
394 struct v9fs_fid *ret;
395 struct v9fs_fcall *fcall;
396
397 nfid = v9fs_get_idpool(&v9ses->fidpool);
398 if (nfid < 0) {
399 eprintk(KERN_WARNING, "no free fids available\n");
400 return ERR_PTR(-ENOSPC);
401 }
402
403 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
404 &fcall);
405
406 if (err < 0) {
407 if (fcall && fcall->id == RWALK)
408 goto clunk_fid;
409
410 PRINT_FCALL_ERROR("walk error", fcall);
411 v9fs_put_idpool(nfid, &v9ses->fidpool);
412 goto error;
413 }
414
415 kfree(fcall);
416 fcall = NULL;
417 ret = v9fs_fid_create(v9ses, nfid);
418 if (!ret) {
419 err = -ENOMEM;
420 goto clunk_fid;
421 }
422
423 err = v9fs_fid_insert(ret, dentry);
424 if (err < 0) {
425 v9fs_fid_destroy(ret);
426 goto clunk_fid;
427 }
428
429 return ret;
430
431clunk_fid:
432 v9fs_t_clunk(v9ses, nfid);
433
434error:
435 kfree(fcall);
436 return ERR_PTR(err);
437}
438*/
439
440
441/**
442 * v9fs_clear_inode - release an inode
443 * @inode: inode to release
444 *
445 */
446void v9fs_evict_inode(struct inode *inode)
447{
448 struct v9fs_inode *v9inode = V9FS_I(inode);
449
450 truncate_inode_pages(inode->i_mapping, 0);
451 clear_inode(inode);
452 filemap_fdatawrite(inode->i_mapping);
453
454#ifdef CONFIG_9P_FSCACHE
455 v9fs_cache_inode_put_cookie(inode);
456#endif
457 /* clunk the fid stashed in writeback_fid */
458 if (v9inode->writeback_fid) {
459 p9_client_clunk(v9inode->writeback_fid);
460 v9inode->writeback_fid = NULL;
461 }
462}
463
464static int v9fs_test_inode(struct inode *inode, void *data)
465{
466 int umode;
467 dev_t rdev;
468 struct v9fs_inode *v9inode = V9FS_I(inode);
469 struct p9_wstat *st = (struct p9_wstat *)data;
470 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
471
472 umode = p9mode2unixmode(v9ses, st, &rdev);
473 /* don't match inode of different type */
474 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
475 return 0;
476
477 /* compare qid details */
478 if (memcmp(&v9inode->qid.version,
479 &st->qid.version, sizeof(v9inode->qid.version)))
480 return 0;
481
482 if (v9inode->qid.type != st->qid.type)
483 return 0;
484 return 1;
485}
486
487static int v9fs_test_new_inode(struct inode *inode, void *data)
488{
489 return 0;
490}
491
492static int v9fs_set_inode(struct inode *inode, void *data)
493{
494 struct v9fs_inode *v9inode = V9FS_I(inode);
495 struct p9_wstat *st = (struct p9_wstat *)data;
496
497 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
498 return 0;
499}
500
501static struct inode *v9fs_qid_iget(struct super_block *sb,
502 struct p9_qid *qid,
503 struct p9_wstat *st,
504 int new)
505{
506 dev_t rdev;
507 int retval;
508 umode_t umode;
509 unsigned long i_ino;
510 struct inode *inode;
511 struct v9fs_session_info *v9ses = sb->s_fs_info;
512 int (*test)(struct inode *, void *);
513
514 if (new)
515 test = v9fs_test_new_inode;
516 else
517 test = v9fs_test_inode;
518
519 i_ino = v9fs_qid2ino(qid);
520 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
521 if (!inode)
522 return ERR_PTR(-ENOMEM);
523 if (!(inode->i_state & I_NEW))
524 return inode;
525 /*
526 * initialize the inode with the stat info
527 * FIXME!! we may need support for stale inodes
528 * later.
529 */
530 inode->i_ino = i_ino;
531 umode = p9mode2unixmode(v9ses, st, &rdev);
532 retval = v9fs_init_inode(v9ses, inode, umode, rdev);
533 if (retval)
534 goto error;
535
536 v9fs_stat2inode(st, inode, sb);
537#ifdef CONFIG_9P_FSCACHE
538 v9fs_cache_inode_get_cookie(inode);
539#endif
540 unlock_new_inode(inode);
541 return inode;
542error:
543 unlock_new_inode(inode);
544 iput(inode);
545 return ERR_PTR(retval);
546
547}
548
549struct inode *
550v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
551 struct super_block *sb, int new)
552{
553 struct p9_wstat *st;
554 struct inode *inode = NULL;
555
556 st = p9_client_stat(fid);
557 if (IS_ERR(st))
558 return ERR_CAST(st);
559
560 inode = v9fs_qid_iget(sb, &st->qid, st, new);
561 p9stat_free(st);
562 kfree(st);
563 return inode;
564}
565
566/**
567 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
568 * plan 9 AT flag.
569 * @flags: flags to convert
570 */
571static int v9fs_at_to_dotl_flags(int flags)
572{
573 int rflags = 0;
574 if (flags & AT_REMOVEDIR)
575 rflags |= P9_DOTL_AT_REMOVEDIR;
576 return rflags;
577}
578
579/**
580 * v9fs_remove - helper function to remove files and directories
581 * @dir: directory inode that is being deleted
582 * @dentry: dentry that is being deleted
583 * @rmdir: removing a directory
584 *
585 */
586
587static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
588{
589 struct inode *inode;
590 int retval = -EOPNOTSUPP;
591 struct p9_fid *v9fid, *dfid;
592 struct v9fs_session_info *v9ses;
593
594 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
595 dir, dentry, flags);
596
597 v9ses = v9fs_inode2v9ses(dir);
598 inode = dentry->d_inode;
599 dfid = v9fs_fid_lookup(dentry->d_parent);
600 if (IS_ERR(dfid)) {
601 retval = PTR_ERR(dfid);
602 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
603 return retval;
604 }
605 if (v9fs_proto_dotl(v9ses))
606 retval = p9_client_unlinkat(dfid, dentry->d_name.name,
607 v9fs_at_to_dotl_flags(flags));
608 if (retval == -EOPNOTSUPP) {
609 /* Try the one based on path */
610 v9fid = v9fs_fid_clone(dentry);
611 if (IS_ERR(v9fid))
612 return PTR_ERR(v9fid);
613 retval = p9_client_remove(v9fid);
614 }
615 if (!retval) {
616 /*
617 * directories on unlink should have zero
618 * link count
619 */
620 if (flags & AT_REMOVEDIR) {
621 clear_nlink(inode);
622 drop_nlink(dir);
623 } else
624 drop_nlink(inode);
625
626 v9fs_invalidate_inode_attr(inode);
627 v9fs_invalidate_inode_attr(dir);
628 }
629 return retval;
630}
631
632/**
633 * v9fs_create - Create a file
634 * @v9ses: session information
635 * @dir: directory that dentry is being created in
636 * @dentry: dentry that is being created
637 * @extension: 9p2000.u extension string to support devices, etc.
638 * @perm: create permissions
639 * @mode: open mode
640 *
641 */
642static struct p9_fid *
643v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
644 struct dentry *dentry, char *extension, u32 perm, u8 mode)
645{
646 int err;
647 char *name;
648 struct p9_fid *dfid, *ofid, *fid;
649 struct inode *inode;
650
651 p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
652
653 err = 0;
654 ofid = NULL;
655 fid = NULL;
656 name = (char *) dentry->d_name.name;
657 dfid = v9fs_fid_lookup(dentry->d_parent);
658 if (IS_ERR(dfid)) {
659 err = PTR_ERR(dfid);
660 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
661 return ERR_PTR(err);
662 }
663
664 /* clone a fid to use for creation */
665 ofid = p9_client_walk(dfid, 0, NULL, 1);
666 if (IS_ERR(ofid)) {
667 err = PTR_ERR(ofid);
668 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
669 return ERR_PTR(err);
670 }
671
672 err = p9_client_fcreate(ofid, name, perm, mode, extension);
673 if (err < 0) {
674 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
675 goto error;
676 }
677
678 if (!(perm & P9_DMLINK)) {
679 /* now walk from the parent so we can get unopened fid */
680 fid = p9_client_walk(dfid, 1, &name, 1);
681 if (IS_ERR(fid)) {
682 err = PTR_ERR(fid);
683 p9_debug(P9_DEBUG_VFS,
684 "p9_client_walk failed %d\n", err);
685 fid = NULL;
686 goto error;
687 }
688 /*
689 * instantiate inode and assign the unopened fid to the dentry
690 */
691 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
692 if (IS_ERR(inode)) {
693 err = PTR_ERR(inode);
694 p9_debug(P9_DEBUG_VFS,
695 "inode creation failed %d\n", err);
696 goto error;
697 }
698 err = v9fs_fid_add(dentry, fid);
699 if (err < 0)
700 goto error;
701 d_instantiate(dentry, inode);
702 }
703 return ofid;
704error:
705 if (ofid)
706 p9_client_clunk(ofid);
707
708 if (fid)
709 p9_client_clunk(fid);
710
711 return ERR_PTR(err);
712}
713
714/**
715 * v9fs_vfs_create - VFS hook to create files
716 * @dir: directory inode that is being created
717 * @dentry: dentry that is being deleted
718 * @mode: create permissions
719 * @nd: path information
720 *
721 */
722
723static int
724v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
725 struct nameidata *nd)
726{
727 int err;
728 u32 perm;
729 int flags;
730 struct file *filp;
731 struct v9fs_inode *v9inode;
732 struct v9fs_session_info *v9ses;
733 struct p9_fid *fid, *inode_fid;
734
735 err = 0;
736 fid = NULL;
737 v9ses = v9fs_inode2v9ses(dir);
738 perm = unixmode2p9mode(v9ses, mode);
739 if (nd)
740 flags = nd->intent.open.flags;
741 else
742 flags = O_RDWR;
743
744 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
745 v9fs_uflags2omode(flags,
746 v9fs_proto_dotu(v9ses)));
747 if (IS_ERR(fid)) {
748 err = PTR_ERR(fid);
749 fid = NULL;
750 goto error;
751 }
752
753 v9fs_invalidate_inode_attr(dir);
754 /* if we are opening a file, assign the open fid to the file */
755 if (nd) {
756 v9inode = V9FS_I(dentry->d_inode);
757 mutex_lock(&v9inode->v_mutex);
758 if (v9ses->cache && !v9inode->writeback_fid &&
759 ((flags & O_ACCMODE) != O_RDONLY)) {
760 /*
761 * clone a fid and add it to writeback_fid
762 * we do it during open time instead of
763 * page dirty time via write_begin/page_mkwrite
764 * because we want write after unlink usecase
765 * to work.
766 */
767 inode_fid = v9fs_writeback_fid(dentry);
768 if (IS_ERR(inode_fid)) {
769 err = PTR_ERR(inode_fid);
770 mutex_unlock(&v9inode->v_mutex);
771 goto error;
772 }
773 v9inode->writeback_fid = (void *) inode_fid;
774 }
775 mutex_unlock(&v9inode->v_mutex);
776 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
777 if (IS_ERR(filp)) {
778 err = PTR_ERR(filp);
779 goto error;
780 }
781
782 filp->private_data = fid;
783#ifdef CONFIG_9P_FSCACHE
784 if (v9ses->cache)
785 v9fs_cache_inode_set_cookie(dentry->d_inode, filp);
786#endif
787 } else
788 p9_client_clunk(fid);
789
790 return 0;
791
792error:
793 if (fid)
794 p9_client_clunk(fid);
795
796 return err;
797}
798
799/**
800 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
801 * @dir: inode that is being unlinked
802 * @dentry: dentry that is being unlinked
803 * @mode: mode for new directory
804 *
805 */
806
807static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
808{
809 int err;
810 u32 perm;
811 struct p9_fid *fid;
812 struct v9fs_session_info *v9ses;
813
814 p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
815 err = 0;
816 v9ses = v9fs_inode2v9ses(dir);
817 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
818 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
819 if (IS_ERR(fid)) {
820 err = PTR_ERR(fid);
821 fid = NULL;
822 } else {
823 inc_nlink(dir);
824 v9fs_invalidate_inode_attr(dir);
825 }
826
827 if (fid)
828 p9_client_clunk(fid);
829
830 return err;
831}
832
833/**
834 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
835 * @dir: inode that is being walked from
836 * @dentry: dentry that is being walked to?
837 * @nameidata: path data
838 *
839 */
840
841struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
842 struct nameidata *nameidata)
843{
844 struct dentry *res;
845 struct super_block *sb;
846 struct v9fs_session_info *v9ses;
847 struct p9_fid *dfid, *fid;
848 struct inode *inode;
849 char *name;
850 int result = 0;
851
852 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
853 dir, dentry->d_name.name, dentry, nameidata);
854
855 if (dentry->d_name.len > NAME_MAX)
856 return ERR_PTR(-ENAMETOOLONG);
857
858 sb = dir->i_sb;
859 v9ses = v9fs_inode2v9ses(dir);
860 /* We can walk d_parent because we hold the dir->i_mutex */
861 dfid = v9fs_fid_lookup(dentry->d_parent);
862 if (IS_ERR(dfid))
863 return ERR_CAST(dfid);
864
865 name = (char *) dentry->d_name.name;
866 fid = p9_client_walk(dfid, 1, &name, 1);
867 if (IS_ERR(fid)) {
868 result = PTR_ERR(fid);
869 if (result == -ENOENT) {
870 inode = NULL;
871 goto inst_out;
872 }
873
874 return ERR_PTR(result);
875 }
876 /*
877 * Make sure we don't use a wrong inode due to parallel
878 * unlink. For cached mode create calls request for new
879 * inode. But with cache disabled, lookup should do this.
880 */
881 if (v9ses->cache)
882 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
883 else
884 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
885 if (IS_ERR(inode)) {
886 result = PTR_ERR(inode);
887 inode = NULL;
888 goto error;
889 }
890 result = v9fs_fid_add(dentry, fid);
891 if (result < 0)
892 goto error_iput;
893inst_out:
894 /*
895 * If we had a rename on the server and a parallel lookup
896 * for the new name, then make sure we instantiate with
897 * the new name. ie look up for a/b, while on server somebody
898 * moved b under k and client parallely did a lookup for
899 * k/b.
900 */
901 res = d_materialise_unique(dentry, inode);
902 if (!IS_ERR(res))
903 return res;
904 result = PTR_ERR(res);
905error_iput:
906 iput(inode);
907error:
908 p9_client_clunk(fid);
909
910 return ERR_PTR(result);
911}
912
913/**
914 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
915 * @i: inode that is being unlinked
916 * @d: dentry that is being unlinked
917 *
918 */
919
920int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
921{
922 return v9fs_remove(i, d, 0);
923}
924
925/**
926 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
927 * @i: inode that is being unlinked
928 * @d: dentry that is being unlinked
929 *
930 */
931
932int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
933{
934 return v9fs_remove(i, d, AT_REMOVEDIR);
935}
936
937/**
938 * v9fs_vfs_rename - VFS hook to rename an inode
939 * @old_dir: old dir inode
940 * @old_dentry: old dentry
941 * @new_dir: new dir inode
942 * @new_dentry: new dentry
943 *
944 */
945
946int
947v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
948 struct inode *new_dir, struct dentry *new_dentry)
949{
950 int retval;
951 struct inode *old_inode;
952 struct inode *new_inode;
953 struct v9fs_session_info *v9ses;
954 struct p9_fid *oldfid;
955 struct p9_fid *olddirfid;
956 struct p9_fid *newdirfid;
957 struct p9_wstat wstat;
958
959 p9_debug(P9_DEBUG_VFS, "\n");
960 retval = 0;
961 old_inode = old_dentry->d_inode;
962 new_inode = new_dentry->d_inode;
963 v9ses = v9fs_inode2v9ses(old_inode);
964 oldfid = v9fs_fid_lookup(old_dentry);
965 if (IS_ERR(oldfid))
966 return PTR_ERR(oldfid);
967
968 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
969 if (IS_ERR(olddirfid)) {
970 retval = PTR_ERR(olddirfid);
971 goto done;
972 }
973
974 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
975 if (IS_ERR(newdirfid)) {
976 retval = PTR_ERR(newdirfid);
977 goto clunk_olddir;
978 }
979
980 down_write(&v9ses->rename_sem);
981 if (v9fs_proto_dotl(v9ses)) {
982 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
983 newdirfid, new_dentry->d_name.name);
984 if (retval == -EOPNOTSUPP)
985 retval = p9_client_rename(oldfid, newdirfid,
986 new_dentry->d_name.name);
987 if (retval != -EOPNOTSUPP)
988 goto clunk_newdir;
989 }
990 if (old_dentry->d_parent != new_dentry->d_parent) {
991 /*
992 * 9P .u can only handle file rename in the same directory
993 */
994
995 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
996 retval = -EXDEV;
997 goto clunk_newdir;
998 }
999 v9fs_blank_wstat(&wstat);
1000 wstat.muid = v9ses->uname;
1001 wstat.name = (char *) new_dentry->d_name.name;
1002 retval = p9_client_wstat(oldfid, &wstat);
1003
1004clunk_newdir:
1005 if (!retval) {
1006 if (new_inode) {
1007 if (S_ISDIR(new_inode->i_mode))
1008 clear_nlink(new_inode);
1009 else
1010 drop_nlink(new_inode);
1011 }
1012 if (S_ISDIR(old_inode->i_mode)) {
1013 if (!new_inode)
1014 inc_nlink(new_dir);
1015 drop_nlink(old_dir);
1016 }
1017 v9fs_invalidate_inode_attr(old_inode);
1018 v9fs_invalidate_inode_attr(old_dir);
1019 v9fs_invalidate_inode_attr(new_dir);
1020
1021 /* successful rename */
1022 d_move(old_dentry, new_dentry);
1023 }
1024 up_write(&v9ses->rename_sem);
1025 p9_client_clunk(newdirfid);
1026
1027clunk_olddir:
1028 p9_client_clunk(olddirfid);
1029
1030done:
1031 return retval;
1032}
1033
1034/**
1035 * v9fs_vfs_getattr - retrieve file metadata
1036 * @mnt: mount information
1037 * @dentry: file to get attributes on
1038 * @stat: metadata structure to populate
1039 *
1040 */
1041
1042static int
1043v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1044 struct kstat *stat)
1045{
1046 int err;
1047 struct v9fs_session_info *v9ses;
1048 struct p9_fid *fid;
1049 struct p9_wstat *st;
1050
1051 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1052 err = -EPERM;
1053 v9ses = v9fs_dentry2v9ses(dentry);
1054 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1055 generic_fillattr(dentry->d_inode, stat);
1056 return 0;
1057 }
1058 fid = v9fs_fid_lookup(dentry);
1059 if (IS_ERR(fid))
1060 return PTR_ERR(fid);
1061
1062 st = p9_client_stat(fid);
1063 if (IS_ERR(st))
1064 return PTR_ERR(st);
1065
1066 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
1067 generic_fillattr(dentry->d_inode, stat);
1068
1069 p9stat_free(st);
1070 kfree(st);
1071 return 0;
1072}
1073
1074/**
1075 * v9fs_vfs_setattr - set file metadata
1076 * @dentry: file whose metadata to set
1077 * @iattr: metadata assignment structure
1078 *
1079 */
1080
1081static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
1082{
1083 int retval;
1084 struct v9fs_session_info *v9ses;
1085 struct p9_fid *fid;
1086 struct p9_wstat wstat;
1087
1088 p9_debug(P9_DEBUG_VFS, "\n");
1089 retval = inode_change_ok(dentry->d_inode, iattr);
1090 if (retval)
1091 return retval;
1092
1093 retval = -EPERM;
1094 v9ses = v9fs_dentry2v9ses(dentry);
1095 fid = v9fs_fid_lookup(dentry);
1096 if(IS_ERR(fid))
1097 return PTR_ERR(fid);
1098
1099 v9fs_blank_wstat(&wstat);
1100 if (iattr->ia_valid & ATTR_MODE)
1101 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1102
1103 if (iattr->ia_valid & ATTR_MTIME)
1104 wstat.mtime = iattr->ia_mtime.tv_sec;
1105
1106 if (iattr->ia_valid & ATTR_ATIME)
1107 wstat.atime = iattr->ia_atime.tv_sec;
1108
1109 if (iattr->ia_valid & ATTR_SIZE)
1110 wstat.length = iattr->ia_size;
1111
1112 if (v9fs_proto_dotu(v9ses)) {
1113 if (iattr->ia_valid & ATTR_UID)
1114 wstat.n_uid = iattr->ia_uid;
1115
1116 if (iattr->ia_valid & ATTR_GID)
1117 wstat.n_gid = iattr->ia_gid;
1118 }
1119
1120 /* Write all dirty data */
1121 if (S_ISREG(dentry->d_inode->i_mode))
1122 filemap_write_and_wait(dentry->d_inode->i_mapping);
1123
1124 retval = p9_client_wstat(fid, &wstat);
1125 if (retval < 0)
1126 return retval;
1127
1128 if ((iattr->ia_valid & ATTR_SIZE) &&
1129 iattr->ia_size != i_size_read(dentry->d_inode))
1130 truncate_setsize(dentry->d_inode, iattr->ia_size);
1131
1132 v9fs_invalidate_inode_attr(dentry->d_inode);
1133
1134 setattr_copy(dentry->d_inode, iattr);
1135 mark_inode_dirty(dentry->d_inode);
1136 return 0;
1137}
1138
1139/**
1140 * v9fs_stat2inode - populate an inode structure with mistat info
1141 * @stat: Plan 9 metadata (mistat) structure
1142 * @inode: inode to populate
1143 * @sb: superblock of filesystem
1144 *
1145 */
1146
1147void
1148v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1149 struct super_block *sb)
1150{
1151 umode_t mode;
1152 char ext[32];
1153 char tag_name[14];
1154 unsigned int i_nlink;
1155 struct v9fs_session_info *v9ses = sb->s_fs_info;
1156 struct v9fs_inode *v9inode = V9FS_I(inode);
1157
1158 set_nlink(inode, 1);
1159
1160 inode->i_atime.tv_sec = stat->atime;
1161 inode->i_mtime.tv_sec = stat->mtime;
1162 inode->i_ctime.tv_sec = stat->mtime;
1163
1164 inode->i_uid = v9ses->dfltuid;
1165 inode->i_gid = v9ses->dfltgid;
1166
1167 if (v9fs_proto_dotu(v9ses)) {
1168 inode->i_uid = stat->n_uid;
1169 inode->i_gid = stat->n_gid;
1170 }
1171 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1172 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1173 /*
1174 * Hadlink support got added later to
1175 * to the .u extension. So there can be
1176 * server out there that doesn't support
1177 * this even with .u extension. So check
1178 * for non NULL stat->extension
1179 */
1180 strncpy(ext, stat->extension, sizeof(ext));
1181 /* HARDLINKCOUNT %u */
1182 sscanf(ext, "%13s %u", tag_name, &i_nlink);
1183 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1184 set_nlink(inode, i_nlink);
1185 }
1186 }
1187 mode = p9mode2perm(v9ses, stat);
1188 mode |= inode->i_mode & ~S_IALLUGO;
1189 inode->i_mode = mode;
1190 i_size_write(inode, stat->length);
1191
1192 /* not real number of blocks, but 512 byte ones ... */
1193 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
1194 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1195}
1196
1197/**
1198 * v9fs_qid2ino - convert qid into inode number
1199 * @qid: qid to hash
1200 *
1201 * BUG: potential for inode number collisions?
1202 */
1203
1204ino_t v9fs_qid2ino(struct p9_qid *qid)
1205{
1206 u64 path = qid->path + 2;
1207 ino_t i = 0;
1208
1209 if (sizeof(ino_t) == sizeof(path))
1210 memcpy(&i, &path, sizeof(ino_t));
1211 else
1212 i = (ino_t) (path ^ (path >> 32));
1213
1214 return i;
1215}
1216
1217/**
1218 * v9fs_readlink - read a symlink's location (internal version)
1219 * @dentry: dentry for symlink
1220 * @buffer: buffer to load symlink location into
1221 * @buflen: length of buffer
1222 *
1223 */
1224
1225static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1226{
1227 int retval;
1228
1229 struct v9fs_session_info *v9ses;
1230 struct p9_fid *fid;
1231 struct p9_wstat *st;
1232
1233 p9_debug(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1234 retval = -EPERM;
1235 v9ses = v9fs_dentry2v9ses(dentry);
1236 fid = v9fs_fid_lookup(dentry);
1237 if (IS_ERR(fid))
1238 return PTR_ERR(fid);
1239
1240 if (!v9fs_proto_dotu(v9ses))
1241 return -EBADF;
1242
1243 st = p9_client_stat(fid);
1244 if (IS_ERR(st))
1245 return PTR_ERR(st);
1246
1247 if (!(st->mode & P9_DMSYMLINK)) {
1248 retval = -EINVAL;
1249 goto done;
1250 }
1251
1252 /* copy extension buffer into buffer */
1253 strncpy(buffer, st->extension, buflen);
1254
1255 p9_debug(P9_DEBUG_VFS, "%s -> %s (%s)\n",
1256 dentry->d_name.name, st->extension, buffer);
1257
1258 retval = strnlen(buffer, buflen);
1259done:
1260 p9stat_free(st);
1261 kfree(st);
1262 return retval;
1263}
1264
1265/**
1266 * v9fs_vfs_follow_link - follow a symlink path
1267 * @dentry: dentry for symlink
1268 * @nd: nameidata
1269 *
1270 */
1271
1272static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1273{
1274 int len = 0;
1275 char *link = __getname();
1276
1277 p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
1278
1279 if (!link)
1280 link = ERR_PTR(-ENOMEM);
1281 else {
1282 len = v9fs_readlink(dentry, link, PATH_MAX);
1283
1284 if (len < 0) {
1285 __putname(link);
1286 link = ERR_PTR(len);
1287 } else
1288 link[min(len, PATH_MAX-1)] = 0;
1289 }
1290 nd_set_link(nd, link);
1291
1292 return NULL;
1293}
1294
1295/**
1296 * v9fs_vfs_put_link - release a symlink path
1297 * @dentry: dentry for symlink
1298 * @nd: nameidata
1299 * @p: unused
1300 *
1301 */
1302
1303void
1304v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1305{
1306 char *s = nd_get_link(nd);
1307
1308 p9_debug(P9_DEBUG_VFS, " %s %s\n",
1309 dentry->d_name.name, IS_ERR(s) ? "<error>" : s);
1310 if (!IS_ERR(s))
1311 __putname(s);
1312}
1313
1314/**
1315 * v9fs_vfs_mkspecial - create a special file
1316 * @dir: inode to create special file in
1317 * @dentry: dentry to create
1318 * @mode: mode to create special file
1319 * @extension: 9p2000.u format extension string representing special file
1320 *
1321 */
1322
1323static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1324 u32 perm, const char *extension)
1325{
1326 struct p9_fid *fid;
1327 struct v9fs_session_info *v9ses;
1328
1329 v9ses = v9fs_inode2v9ses(dir);
1330 if (!v9fs_proto_dotu(v9ses)) {
1331 p9_debug(P9_DEBUG_ERROR, "not extended\n");
1332 return -EPERM;
1333 }
1334
1335 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1336 P9_OREAD);
1337 if (IS_ERR(fid))
1338 return PTR_ERR(fid);
1339
1340 v9fs_invalidate_inode_attr(dir);
1341 p9_client_clunk(fid);
1342 return 0;
1343}
1344
1345/**
1346 * v9fs_vfs_symlink - helper function to create symlinks
1347 * @dir: directory inode containing symlink
1348 * @dentry: dentry for symlink
1349 * @symname: symlink data
1350 *
1351 * See Also: 9P2000.u RFC for more information
1352 *
1353 */
1354
1355static int
1356v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1357{
1358 p9_debug(P9_DEBUG_VFS, " %lu,%s,%s\n",
1359 dir->i_ino, dentry->d_name.name, symname);
1360
1361 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname);
1362}
1363
1364/**
1365 * v9fs_vfs_link - create a hardlink
1366 * @old_dentry: dentry for file to link to
1367 * @dir: inode destination for new link
1368 * @dentry: dentry for link
1369 *
1370 */
1371
1372static int
1373v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1374 struct dentry *dentry)
1375{
1376 int retval;
1377 char *name;
1378 struct p9_fid *oldfid;
1379
1380 p9_debug(P9_DEBUG_VFS, " %lu,%s,%s\n",
1381 dir->i_ino, dentry->d_name.name, old_dentry->d_name.name);
1382
1383 oldfid = v9fs_fid_clone(old_dentry);
1384 if (IS_ERR(oldfid))
1385 return PTR_ERR(oldfid);
1386
1387 name = __getname();
1388 if (unlikely(!name)) {
1389 retval = -ENOMEM;
1390 goto clunk_fid;
1391 }
1392
1393 sprintf(name, "%d\n", oldfid->fid);
1394 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1395 __putname(name);
1396 if (!retval) {
1397 v9fs_refresh_inode(oldfid, old_dentry->d_inode);
1398 v9fs_invalidate_inode_attr(dir);
1399 }
1400clunk_fid:
1401 p9_client_clunk(oldfid);
1402 return retval;
1403}
1404
1405/**
1406 * v9fs_vfs_mknod - create a special file
1407 * @dir: inode destination for new link
1408 * @dentry: dentry for file
1409 * @mode: mode for creation
1410 * @rdev: device associated with special file
1411 *
1412 */
1413
1414static int
1415v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
1416{
1417 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1418 int retval;
1419 char *name;
1420 u32 perm;
1421
1422 p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n",
1423 dir->i_ino, dentry->d_name.name, mode,
1424 MAJOR(rdev), MINOR(rdev));
1425
1426 if (!new_valid_dev(rdev))
1427 return -EINVAL;
1428
1429 name = __getname();
1430 if (!name)
1431 return -ENOMEM;
1432 /* build extension */
1433 if (S_ISBLK(mode))
1434 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1435 else if (S_ISCHR(mode))
1436 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1437 else if (S_ISFIFO(mode))
1438 *name = 0;
1439 else if (S_ISSOCK(mode))
1440 *name = 0;
1441 else {
1442 __putname(name);
1443 return -EINVAL;
1444 }
1445
1446 perm = unixmode2p9mode(v9ses, mode);
1447 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name);
1448 __putname(name);
1449
1450 return retval;
1451}
1452
1453int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1454{
1455 int umode;
1456 dev_t rdev;
1457 loff_t i_size;
1458 struct p9_wstat *st;
1459 struct v9fs_session_info *v9ses;
1460
1461 v9ses = v9fs_inode2v9ses(inode);
1462 st = p9_client_stat(fid);
1463 if (IS_ERR(st))
1464 return PTR_ERR(st);
1465 /*
1466 * Don't update inode if the file type is different
1467 */
1468 umode = p9mode2unixmode(v9ses, st, &rdev);
1469 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
1470 goto out;
1471
1472 spin_lock(&inode->i_lock);
1473 /*
1474 * We don't want to refresh inode->i_size,
1475 * because we may have cached data
1476 */
1477 i_size = inode->i_size;
1478 v9fs_stat2inode(st, inode, inode->i_sb);
1479 if (v9ses->cache)
1480 inode->i_size = i_size;
1481 spin_unlock(&inode->i_lock);
1482out:
1483 p9stat_free(st);
1484 kfree(st);
1485 return 0;
1486}
1487
1488static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1489 .create = v9fs_vfs_create,
1490 .lookup = v9fs_vfs_lookup,
1491 .symlink = v9fs_vfs_symlink,
1492 .link = v9fs_vfs_link,
1493 .unlink = v9fs_vfs_unlink,
1494 .mkdir = v9fs_vfs_mkdir,
1495 .rmdir = v9fs_vfs_rmdir,
1496 .mknod = v9fs_vfs_mknod,
1497 .rename = v9fs_vfs_rename,
1498 .getattr = v9fs_vfs_getattr,
1499 .setattr = v9fs_vfs_setattr,
1500};
1501
1502static const struct inode_operations v9fs_dir_inode_operations = {
1503 .create = v9fs_vfs_create,
1504 .lookup = v9fs_vfs_lookup,
1505 .unlink = v9fs_vfs_unlink,
1506 .mkdir = v9fs_vfs_mkdir,
1507 .rmdir = v9fs_vfs_rmdir,
1508 .mknod = v9fs_vfs_mknod,
1509 .rename = v9fs_vfs_rename,
1510 .getattr = v9fs_vfs_getattr,
1511 .setattr = v9fs_vfs_setattr,
1512};
1513
1514static const struct inode_operations v9fs_file_inode_operations = {
1515 .getattr = v9fs_vfs_getattr,
1516 .setattr = v9fs_vfs_setattr,
1517};
1518
1519static const struct inode_operations v9fs_symlink_inode_operations = {
1520 .readlink = generic_readlink,
1521 .follow_link = v9fs_vfs_follow_link,
1522 .put_link = v9fs_vfs_put_link,
1523 .getattr = v9fs_vfs_getattr,
1524 .setattr = v9fs_vfs_setattr,
1525};
1526
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/inet.h>
19#include <linux/namei.h>
20#include <linux/sched.h>
21#include <linux/slab.h>
22#include <linux/xattr.h>
23#include <linux/posix_acl.h>
24#include <net/9p/9p.h>
25#include <net/9p/client.h>
26
27#include "v9fs.h"
28#include "v9fs_vfs.h"
29#include "fid.h"
30#include "cache.h"
31#include "xattr.h"
32#include "acl.h"
33
34static const struct inode_operations v9fs_dir_inode_operations;
35static const struct inode_operations v9fs_dir_inode_operations_dotu;
36static const struct inode_operations v9fs_file_inode_operations;
37static const struct inode_operations v9fs_symlink_inode_operations;
38
39/**
40 * unixmode2p9mode - convert unix mode bits to plan 9
41 * @v9ses: v9fs session information
42 * @mode: mode to convert
43 *
44 */
45
46static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode)
47{
48 int res;
49
50 res = mode & 0777;
51 if (S_ISDIR(mode))
52 res |= P9_DMDIR;
53 if (v9fs_proto_dotu(v9ses)) {
54 if (v9ses->nodev == 0) {
55 if (S_ISSOCK(mode))
56 res |= P9_DMSOCKET;
57 if (S_ISFIFO(mode))
58 res |= P9_DMNAMEDPIPE;
59 if (S_ISBLK(mode))
60 res |= P9_DMDEVICE;
61 if (S_ISCHR(mode))
62 res |= P9_DMDEVICE;
63 }
64
65 if ((mode & S_ISUID) == S_ISUID)
66 res |= P9_DMSETUID;
67 if ((mode & S_ISGID) == S_ISGID)
68 res |= P9_DMSETGID;
69 if ((mode & S_ISVTX) == S_ISVTX)
70 res |= P9_DMSETVTX;
71 }
72 return res;
73}
74
75/**
76 * p9mode2perm- convert plan9 mode bits to unix permission bits
77 * @v9ses: v9fs session information
78 * @stat: p9_wstat from which mode need to be derived
79 *
80 */
81static int p9mode2perm(struct v9fs_session_info *v9ses,
82 struct p9_wstat *stat)
83{
84 int res;
85 int mode = stat->mode;
86
87 res = mode & S_IALLUGO;
88 if (v9fs_proto_dotu(v9ses)) {
89 if ((mode & P9_DMSETUID) == P9_DMSETUID)
90 res |= S_ISUID;
91
92 if ((mode & P9_DMSETGID) == P9_DMSETGID)
93 res |= S_ISGID;
94
95 if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
96 res |= S_ISVTX;
97 }
98 return res;
99}
100
101/**
102 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
103 * @v9ses: v9fs session information
104 * @stat: p9_wstat from which mode need to be derived
105 * @rdev: major number, minor number in case of device files.
106 *
107 */
108static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses,
109 struct p9_wstat *stat, dev_t *rdev)
110{
111 int res, r;
112 u32 mode = stat->mode;
113
114 *rdev = 0;
115 res = p9mode2perm(v9ses, stat);
116
117 if ((mode & P9_DMDIR) == P9_DMDIR)
118 res |= S_IFDIR;
119 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
120 res |= S_IFLNK;
121 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
122 && (v9ses->nodev == 0))
123 res |= S_IFSOCK;
124 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
125 && (v9ses->nodev == 0))
126 res |= S_IFIFO;
127 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
128 && (v9ses->nodev == 0)) {
129 char type = 0;
130 int major = -1, minor = -1;
131
132 r = sscanf(stat->extension, "%c %i %i", &type, &major, &minor);
133 if (r != 3) {
134 p9_debug(P9_DEBUG_ERROR,
135 "invalid device string, umode will be bogus: %s\n",
136 stat->extension);
137 return res;
138 }
139 switch (type) {
140 case 'c':
141 res |= S_IFCHR;
142 break;
143 case 'b':
144 res |= S_IFBLK;
145 break;
146 default:
147 p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n",
148 type, stat->extension);
149 }
150 *rdev = MKDEV(major, minor);
151 } else
152 res |= S_IFREG;
153
154 return res;
155}
156
157/**
158 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
159 * @uflags: flags to convert
160 * @extended: if .u extensions are active
161 */
162
163int v9fs_uflags2omode(int uflags, int extended)
164{
165 int ret;
166
167 ret = 0;
168 switch (uflags&3) {
169 default:
170 case O_RDONLY:
171 ret = P9_OREAD;
172 break;
173
174 case O_WRONLY:
175 ret = P9_OWRITE;
176 break;
177
178 case O_RDWR:
179 ret = P9_ORDWR;
180 break;
181 }
182
183 if (extended) {
184 if (uflags & O_EXCL)
185 ret |= P9_OEXCL;
186
187 if (uflags & O_APPEND)
188 ret |= P9_OAPPEND;
189 }
190
191 return ret;
192}
193
194/**
195 * v9fs_blank_wstat - helper function to setup a 9P stat structure
196 * @wstat: structure to initialize
197 *
198 */
199
200void
201v9fs_blank_wstat(struct p9_wstat *wstat)
202{
203 wstat->type = ~0;
204 wstat->dev = ~0;
205 wstat->qid.type = ~0;
206 wstat->qid.version = ~0;
207 *((long long *)&wstat->qid.path) = ~0;
208 wstat->mode = ~0;
209 wstat->atime = ~0;
210 wstat->mtime = ~0;
211 wstat->length = ~0;
212 wstat->name = NULL;
213 wstat->uid = NULL;
214 wstat->gid = NULL;
215 wstat->muid = NULL;
216 wstat->n_uid = INVALID_UID;
217 wstat->n_gid = INVALID_GID;
218 wstat->n_muid = INVALID_UID;
219 wstat->extension = NULL;
220}
221
222/**
223 * v9fs_alloc_inode - helper function to allocate an inode
224 * @sb: The superblock to allocate the inode from
225 */
226struct inode *v9fs_alloc_inode(struct super_block *sb)
227{
228 struct v9fs_inode *v9inode;
229
230 v9inode = alloc_inode_sb(sb, v9fs_inode_cache, GFP_KERNEL);
231 if (!v9inode)
232 return NULL;
233 v9inode->writeback_fid = 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 */
252static void 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);
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(&init_user_ns, inode, NULL, mode);
264 inode->i_blocks = 0;
265 inode->i_rdev = rdev;
266 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(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 if (v9ses->cache == CACHE_LOOSE ||
291 v9ses->cache == CACHE_FSCACHE)
292 inode->i_fop =
293 &v9fs_cached_file_operations_dotl;
294 else if (v9ses->cache == CACHE_MMAP)
295 inode->i_fop = &v9fs_mmap_file_operations_dotl;
296 else
297 inode->i_fop = &v9fs_file_operations_dotl;
298 } else {
299 inode->i_op = &v9fs_file_inode_operations;
300 if (v9ses->cache == CACHE_LOOSE ||
301 v9ses->cache == CACHE_FSCACHE)
302 inode->i_fop =
303 &v9fs_cached_file_operations;
304 else if (v9ses->cache == CACHE_MMAP)
305 inode->i_fop = &v9fs_mmap_file_operations;
306 else
307 inode->i_fop = &v9fs_file_operations;
308 }
309
310 break;
311 case S_IFLNK:
312 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
313 p9_debug(P9_DEBUG_ERROR,
314 "extended modes used with legacy protocol\n");
315 err = -EINVAL;
316 goto error;
317 }
318
319 if (v9fs_proto_dotl(v9ses))
320 inode->i_op = &v9fs_symlink_inode_operations_dotl;
321 else
322 inode->i_op = &v9fs_symlink_inode_operations;
323
324 break;
325 case S_IFDIR:
326 inc_nlink(inode);
327 if (v9fs_proto_dotl(v9ses))
328 inode->i_op = &v9fs_dir_inode_operations_dotl;
329 else if (v9fs_proto_dotu(v9ses))
330 inode->i_op = &v9fs_dir_inode_operations_dotu;
331 else
332 inode->i_op = &v9fs_dir_inode_operations;
333
334 if (v9fs_proto_dotl(v9ses))
335 inode->i_fop = &v9fs_dir_operations_dotl;
336 else
337 inode->i_fop = &v9fs_dir_operations;
338
339 break;
340 default:
341 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n",
342 mode, mode & S_IFMT);
343 err = -EINVAL;
344 goto error;
345 }
346
347 v9fs_set_netfs_context(inode);
348error:
349 return err;
350
351}
352
353/**
354 * v9fs_get_inode - helper function to setup an inode
355 * @sb: superblock
356 * @mode: mode to setup inode with
357 * @rdev: The device numbers to set
358 */
359
360struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev)
361{
362 int err;
363 struct inode *inode;
364 struct v9fs_session_info *v9ses = sb->s_fs_info;
365
366 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode);
367
368 inode = new_inode(sb);
369 if (!inode) {
370 pr_warn("%s (%d): Problem allocating inode\n",
371 __func__, task_pid_nr(current));
372 return ERR_PTR(-ENOMEM);
373 }
374 err = v9fs_init_inode(v9ses, inode, mode, rdev);
375 if (err) {
376 iput(inode);
377 return ERR_PTR(err);
378 }
379 return inode;
380}
381
382/**
383 * v9fs_evict_inode - Remove an inode from the inode cache
384 * @inode: inode to release
385 *
386 */
387void v9fs_evict_inode(struct inode *inode)
388{
389 struct v9fs_inode *v9inode = V9FS_I(inode);
390 __le32 version;
391
392 truncate_inode_pages_final(&inode->i_data);
393 version = cpu_to_le32(v9inode->qid.version);
394 fscache_clear_inode_writeback(v9fs_inode_cookie(v9inode), inode,
395 &version);
396 clear_inode(inode);
397 filemap_fdatawrite(&inode->i_data);
398
399 fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false);
400 /* clunk the fid stashed in writeback_fid */
401 p9_fid_put(v9inode->writeback_fid);
402 v9inode->writeback_fid = NULL;
403}
404
405static int v9fs_test_inode(struct inode *inode, void *data)
406{
407 int umode;
408 dev_t rdev;
409 struct v9fs_inode *v9inode = V9FS_I(inode);
410 struct p9_wstat *st = (struct p9_wstat *)data;
411 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
412
413 umode = p9mode2unixmode(v9ses, st, &rdev);
414 /* don't match inode of different type */
415 if (inode_wrong_type(inode, umode))
416 return 0;
417
418 /* compare qid details */
419 if (memcmp(&v9inode->qid.version,
420 &st->qid.version, sizeof(v9inode->qid.version)))
421 return 0;
422
423 if (v9inode->qid.type != st->qid.type)
424 return 0;
425
426 if (v9inode->qid.path != st->qid.path)
427 return 0;
428 return 1;
429}
430
431static int v9fs_test_new_inode(struct inode *inode, void *data)
432{
433 return 0;
434}
435
436static int v9fs_set_inode(struct inode *inode, void *data)
437{
438 struct v9fs_inode *v9inode = V9FS_I(inode);
439 struct p9_wstat *st = (struct p9_wstat *)data;
440
441 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
442 return 0;
443}
444
445static struct inode *v9fs_qid_iget(struct super_block *sb,
446 struct p9_qid *qid,
447 struct p9_wstat *st,
448 int new)
449{
450 dev_t rdev;
451 int retval;
452 umode_t umode;
453 unsigned long i_ino;
454 struct inode *inode;
455 struct v9fs_session_info *v9ses = sb->s_fs_info;
456 int (*test)(struct inode *inode, void *data);
457
458 if (new)
459 test = v9fs_test_new_inode;
460 else
461 test = v9fs_test_inode;
462
463 i_ino = v9fs_qid2ino(qid);
464 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
465 if (!inode)
466 return ERR_PTR(-ENOMEM);
467 if (!(inode->i_state & I_NEW))
468 return inode;
469 /*
470 * initialize the inode with the stat info
471 * FIXME!! we may need support for stale inodes
472 * later.
473 */
474 inode->i_ino = i_ino;
475 umode = p9mode2unixmode(v9ses, st, &rdev);
476 retval = v9fs_init_inode(v9ses, inode, umode, rdev);
477 if (retval)
478 goto error;
479
480 v9fs_stat2inode(st, inode, sb, 0);
481 v9fs_cache_inode_get_cookie(inode);
482 unlock_new_inode(inode);
483 return inode;
484error:
485 iget_failed(inode);
486 return ERR_PTR(retval);
487
488}
489
490struct inode *
491v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
492 struct super_block *sb, int new)
493{
494 struct p9_wstat *st;
495 struct inode *inode = NULL;
496
497 st = p9_client_stat(fid);
498 if (IS_ERR(st))
499 return ERR_CAST(st);
500
501 inode = v9fs_qid_iget(sb, &st->qid, st, new);
502 p9stat_free(st);
503 kfree(st);
504 return inode;
505}
506
507/**
508 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
509 * plan 9 AT flag.
510 * @flags: flags to convert
511 */
512static int v9fs_at_to_dotl_flags(int flags)
513{
514 int rflags = 0;
515
516 if (flags & AT_REMOVEDIR)
517 rflags |= P9_DOTL_AT_REMOVEDIR;
518
519 return rflags;
520}
521
522/**
523 * v9fs_dec_count - helper functon to drop i_nlink.
524 *
525 * If a directory had nlink <= 2 (including . and ..), then we should not drop
526 * the link count, which indicates the underlying exported fs doesn't maintain
527 * nlink accurately. e.g.
528 * - overlayfs sets nlink to 1 for merged dir
529 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more
530 * than EXT4_LINK_MAX (65000) links.
531 *
532 * @inode: inode whose nlink is being dropped
533 */
534static void v9fs_dec_count(struct inode *inode)
535{
536 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2)
537 drop_nlink(inode);
538}
539
540/**
541 * v9fs_remove - helper function to remove files and directories
542 * @dir: directory inode that is being deleted
543 * @dentry: dentry that is being deleted
544 * @flags: removing a directory
545 *
546 */
547
548static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
549{
550 struct inode *inode;
551 int retval = -EOPNOTSUPP;
552 struct p9_fid *v9fid, *dfid;
553 struct v9fs_session_info *v9ses;
554
555 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
556 dir, dentry, flags);
557
558 v9ses = v9fs_inode2v9ses(dir);
559 inode = d_inode(dentry);
560 dfid = v9fs_parent_fid(dentry);
561 if (IS_ERR(dfid)) {
562 retval = PTR_ERR(dfid);
563 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
564 return retval;
565 }
566 if (v9fs_proto_dotl(v9ses))
567 retval = p9_client_unlinkat(dfid, dentry->d_name.name,
568 v9fs_at_to_dotl_flags(flags));
569 p9_fid_put(dfid);
570 if (retval == -EOPNOTSUPP) {
571 /* Try the one based on path */
572 v9fid = v9fs_fid_clone(dentry);
573 if (IS_ERR(v9fid))
574 return PTR_ERR(v9fid);
575 retval = p9_client_remove(v9fid);
576 }
577 if (!retval) {
578 /*
579 * directories on unlink should have zero
580 * link count
581 */
582 if (flags & AT_REMOVEDIR) {
583 clear_nlink(inode);
584 v9fs_dec_count(dir);
585 } else
586 v9fs_dec_count(inode);
587
588 v9fs_invalidate_inode_attr(inode);
589 v9fs_invalidate_inode_attr(dir);
590
591 /* invalidate all fids associated with dentry */
592 /* NOTE: This will not include open fids */
593 dentry->d_op->d_release(dentry);
594 }
595 return retval;
596}
597
598/**
599 * v9fs_create - Create a file
600 * @v9ses: session information
601 * @dir: directory that dentry is being created in
602 * @dentry: dentry that is being created
603 * @extension: 9p2000.u extension string to support devices, etc.
604 * @perm: create permissions
605 * @mode: open mode
606 *
607 */
608static struct p9_fid *
609v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
610 struct dentry *dentry, char *extension, u32 perm, u8 mode)
611{
612 int err;
613 const unsigned char *name;
614 struct p9_fid *dfid, *ofid = NULL, *fid = NULL;
615 struct inode *inode;
616
617 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
618
619 err = 0;
620 name = dentry->d_name.name;
621 dfid = v9fs_parent_fid(dentry);
622 if (IS_ERR(dfid)) {
623 err = PTR_ERR(dfid);
624 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
625 return ERR_PTR(err);
626 }
627
628 /* clone a fid to use for creation */
629 ofid = clone_fid(dfid);
630 if (IS_ERR(ofid)) {
631 err = PTR_ERR(ofid);
632 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
633 goto error;
634 }
635
636 err = p9_client_fcreate(ofid, name, perm, mode, extension);
637 if (err < 0) {
638 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
639 goto error;
640 }
641
642 if (!(perm & P9_DMLINK)) {
643 /* now walk from the parent so we can get unopened fid */
644 fid = p9_client_walk(dfid, 1, &name, 1);
645 if (IS_ERR(fid)) {
646 err = PTR_ERR(fid);
647 p9_debug(P9_DEBUG_VFS,
648 "p9_client_walk failed %d\n", err);
649 goto error;
650 }
651 /*
652 * instantiate inode and assign the unopened fid to the dentry
653 */
654 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
655 if (IS_ERR(inode)) {
656 err = PTR_ERR(inode);
657 p9_debug(P9_DEBUG_VFS,
658 "inode creation failed %d\n", err);
659 goto error;
660 }
661 v9fs_fid_add(dentry, &fid);
662 d_instantiate(dentry, inode);
663 }
664 p9_fid_put(dfid);
665 return ofid;
666error:
667 p9_fid_put(dfid);
668 p9_fid_put(ofid);
669 p9_fid_put(fid);
670 return ERR_PTR(err);
671}
672
673/**
674 * v9fs_vfs_create - VFS hook to create a regular file
675 * @mnt_userns: The user namespace of the mount
676 * @dir: The parent directory
677 * @dentry: The name of file to be created
678 * @mode: The UNIX file mode to set
679 * @excl: True if the file must not yet exist
680 *
681 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called
682 * for mknod(2).
683 *
684 */
685
686static int
687v9fs_vfs_create(struct user_namespace *mnt_userns, struct inode *dir,
688 struct dentry *dentry, umode_t mode, bool excl)
689{
690 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
691 u32 perm = unixmode2p9mode(v9ses, mode);
692 struct p9_fid *fid;
693
694 /* P9_OEXCL? */
695 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR);
696 if (IS_ERR(fid))
697 return PTR_ERR(fid);
698
699 v9fs_invalidate_inode_attr(dir);
700 p9_fid_put(fid);
701
702 return 0;
703}
704
705/**
706 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
707 * @mnt_userns: The user namespace of the mount
708 * @dir: inode that is being unlinked
709 * @dentry: dentry that is being unlinked
710 * @mode: mode for new directory
711 *
712 */
713
714static int v9fs_vfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
715 struct dentry *dentry, umode_t mode)
716{
717 int err;
718 u32 perm;
719 struct p9_fid *fid;
720 struct v9fs_session_info *v9ses;
721
722 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
723 err = 0;
724 v9ses = v9fs_inode2v9ses(dir);
725 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
726 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
727 if (IS_ERR(fid)) {
728 err = PTR_ERR(fid);
729 fid = NULL;
730 } else {
731 inc_nlink(dir);
732 v9fs_invalidate_inode_attr(dir);
733 }
734
735 if (fid)
736 p9_fid_put(fid);
737
738 return err;
739}
740
741/**
742 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
743 * @dir: inode that is being walked from
744 * @dentry: dentry that is being walked to?
745 * @flags: lookup flags (unused)
746 *
747 */
748
749struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
750 unsigned int flags)
751{
752 struct dentry *res;
753 struct v9fs_session_info *v9ses;
754 struct p9_fid *dfid, *fid;
755 struct inode *inode;
756 const unsigned char *name;
757
758 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n",
759 dir, dentry, dentry, flags);
760
761 if (dentry->d_name.len > NAME_MAX)
762 return ERR_PTR(-ENAMETOOLONG);
763
764 v9ses = v9fs_inode2v9ses(dir);
765 /* We can walk d_parent because we hold the dir->i_mutex */
766 dfid = v9fs_parent_fid(dentry);
767 if (IS_ERR(dfid))
768 return ERR_CAST(dfid);
769
770 /*
771 * Make sure we don't use a wrong inode due to parallel
772 * unlink. For cached mode create calls request for new
773 * inode. But with cache disabled, lookup should do this.
774 */
775 name = dentry->d_name.name;
776 fid = p9_client_walk(dfid, 1, &name, 1);
777 p9_fid_put(dfid);
778 if (fid == ERR_PTR(-ENOENT))
779 inode = NULL;
780 else if (IS_ERR(fid))
781 inode = ERR_CAST(fid);
782 else if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
783 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
784 else
785 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
786 /*
787 * If we had a rename on the server and a parallel lookup
788 * for the new name, then make sure we instantiate with
789 * the new name. ie look up for a/b, while on server somebody
790 * moved b under k and client parallely did a lookup for
791 * k/b.
792 */
793 res = d_splice_alias(inode, dentry);
794 if (!IS_ERR(fid)) {
795 if (!res)
796 v9fs_fid_add(dentry, &fid);
797 else if (!IS_ERR(res))
798 v9fs_fid_add(res, &fid);
799 else
800 p9_fid_put(fid);
801 }
802 return res;
803}
804
805static int
806v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
807 struct file *file, unsigned int flags, umode_t mode)
808{
809 int err;
810 u32 perm;
811 struct v9fs_inode *v9inode;
812 struct v9fs_session_info *v9ses;
813 struct p9_fid *fid, *inode_fid;
814 struct dentry *res = NULL;
815 struct inode *inode;
816
817 if (d_in_lookup(dentry)) {
818 res = v9fs_vfs_lookup(dir, dentry, 0);
819 if (IS_ERR(res))
820 return PTR_ERR(res);
821
822 if (res)
823 dentry = res;
824 }
825
826 /* Only creates */
827 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
828 return finish_no_open(file, res);
829
830 err = 0;
831
832 v9ses = v9fs_inode2v9ses(dir);
833 perm = unixmode2p9mode(v9ses, mode);
834 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
835 v9fs_uflags2omode(flags,
836 v9fs_proto_dotu(v9ses)));
837 if (IS_ERR(fid)) {
838 err = PTR_ERR(fid);
839 goto error;
840 }
841
842 v9fs_invalidate_inode_attr(dir);
843 inode = d_inode(dentry);
844 v9inode = V9FS_I(inode);
845 mutex_lock(&v9inode->v_mutex);
846 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
847 !v9inode->writeback_fid &&
848 ((flags & O_ACCMODE) != O_RDONLY)) {
849 /*
850 * clone a fid and add it to writeback_fid
851 * we do it during open time instead of
852 * page dirty time via write_begin/page_mkwrite
853 * because we want write after unlink usecase
854 * to work.
855 */
856 inode_fid = v9fs_writeback_fid(dentry);
857 if (IS_ERR(inode_fid)) {
858 err = PTR_ERR(inode_fid);
859 mutex_unlock(&v9inode->v_mutex);
860 goto error;
861 }
862 v9inode->writeback_fid = (void *) inode_fid;
863 }
864 mutex_unlock(&v9inode->v_mutex);
865 err = finish_open(file, dentry, generic_file_open);
866 if (err)
867 goto error;
868
869 file->private_data = fid;
870 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
871 fscache_use_cookie(v9fs_inode_cookie(v9inode),
872 file->f_mode & FMODE_WRITE);
873 v9fs_open_fid_add(inode, &fid);
874
875 file->f_mode |= FMODE_CREATED;
876out:
877 dput(res);
878 return err;
879
880error:
881 p9_fid_put(fid);
882 goto out;
883}
884
885/**
886 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
887 * @i: inode that is being unlinked
888 * @d: dentry that is being unlinked
889 *
890 */
891
892int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
893{
894 return v9fs_remove(i, d, 0);
895}
896
897/**
898 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
899 * @i: inode that is being unlinked
900 * @d: dentry that is being unlinked
901 *
902 */
903
904int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
905{
906 return v9fs_remove(i, d, AT_REMOVEDIR);
907}
908
909/**
910 * v9fs_vfs_rename - VFS hook to rename an inode
911 * @mnt_userns: The user namespace of the mount
912 * @old_dir: old dir inode
913 * @old_dentry: old dentry
914 * @new_dir: new dir inode
915 * @new_dentry: new dentry
916 * @flags: RENAME_* flags
917 *
918 */
919
920int
921v9fs_vfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
922 struct dentry *old_dentry, struct inode *new_dir,
923 struct dentry *new_dentry, unsigned int flags)
924{
925 int retval;
926 struct inode *old_inode;
927 struct inode *new_inode;
928 struct v9fs_session_info *v9ses;
929 struct p9_fid *oldfid = NULL, *dfid = NULL;
930 struct p9_fid *olddirfid = NULL;
931 struct p9_fid *newdirfid = NULL;
932 struct p9_wstat wstat;
933
934 if (flags)
935 return -EINVAL;
936
937 p9_debug(P9_DEBUG_VFS, "\n");
938 retval = 0;
939 old_inode = d_inode(old_dentry);
940 new_inode = d_inode(new_dentry);
941 v9ses = v9fs_inode2v9ses(old_inode);
942 oldfid = v9fs_fid_lookup(old_dentry);
943 if (IS_ERR(oldfid))
944 return PTR_ERR(oldfid);
945
946 dfid = v9fs_parent_fid(old_dentry);
947 olddirfid = clone_fid(dfid);
948 p9_fid_put(dfid);
949 dfid = NULL;
950
951 if (IS_ERR(olddirfid)) {
952 retval = PTR_ERR(olddirfid);
953 goto error;
954 }
955
956 dfid = v9fs_parent_fid(new_dentry);
957 newdirfid = clone_fid(dfid);
958 p9_fid_put(dfid);
959 dfid = NULL;
960
961 if (IS_ERR(newdirfid)) {
962 retval = PTR_ERR(newdirfid);
963 goto error;
964 }
965
966 down_write(&v9ses->rename_sem);
967 if (v9fs_proto_dotl(v9ses)) {
968 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
969 newdirfid, new_dentry->d_name.name);
970 if (retval == -EOPNOTSUPP)
971 retval = p9_client_rename(oldfid, newdirfid,
972 new_dentry->d_name.name);
973 if (retval != -EOPNOTSUPP)
974 goto error_locked;
975 }
976 if (old_dentry->d_parent != new_dentry->d_parent) {
977 /*
978 * 9P .u can only handle file rename in the same directory
979 */
980
981 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
982 retval = -EXDEV;
983 goto error_locked;
984 }
985 v9fs_blank_wstat(&wstat);
986 wstat.muid = v9ses->uname;
987 wstat.name = new_dentry->d_name.name;
988 retval = p9_client_wstat(oldfid, &wstat);
989
990error_locked:
991 if (!retval) {
992 if (new_inode) {
993 if (S_ISDIR(new_inode->i_mode))
994 clear_nlink(new_inode);
995 else
996 v9fs_dec_count(new_inode);
997 }
998 if (S_ISDIR(old_inode->i_mode)) {
999 if (!new_inode)
1000 inc_nlink(new_dir);
1001 v9fs_dec_count(old_dir);
1002 }
1003 v9fs_invalidate_inode_attr(old_inode);
1004 v9fs_invalidate_inode_attr(old_dir);
1005 v9fs_invalidate_inode_attr(new_dir);
1006
1007 /* successful rename */
1008 d_move(old_dentry, new_dentry);
1009 }
1010 up_write(&v9ses->rename_sem);
1011
1012error:
1013 p9_fid_put(newdirfid);
1014 p9_fid_put(olddirfid);
1015 p9_fid_put(oldfid);
1016 return retval;
1017}
1018
1019/**
1020 * v9fs_vfs_getattr - retrieve file metadata
1021 * @mnt_userns: The user namespace of the mount
1022 * @path: Object to query
1023 * @stat: metadata structure to populate
1024 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
1025 * @flags: AT_STATX_xxx setting
1026 *
1027 */
1028
1029static int
1030v9fs_vfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
1031 struct kstat *stat, u32 request_mask, unsigned int flags)
1032{
1033 struct dentry *dentry = path->dentry;
1034 struct v9fs_session_info *v9ses;
1035 struct p9_fid *fid;
1036 struct p9_wstat *st;
1037
1038 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1039 v9ses = v9fs_dentry2v9ses(dentry);
1040 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1041 generic_fillattr(&init_user_ns, d_inode(dentry), stat);
1042 return 0;
1043 }
1044 fid = v9fs_fid_lookup(dentry);
1045 if (IS_ERR(fid))
1046 return PTR_ERR(fid);
1047
1048 st = p9_client_stat(fid);
1049 p9_fid_put(fid);
1050 if (IS_ERR(st))
1051 return PTR_ERR(st);
1052
1053 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0);
1054 generic_fillattr(&init_user_ns, d_inode(dentry), stat);
1055
1056 p9stat_free(st);
1057 kfree(st);
1058 return 0;
1059}
1060
1061/**
1062 * v9fs_vfs_setattr - set file metadata
1063 * @mnt_userns: The user namespace of the mount
1064 * @dentry: file whose metadata to set
1065 * @iattr: metadata assignment structure
1066 *
1067 */
1068
1069static int v9fs_vfs_setattr(struct user_namespace *mnt_userns,
1070 struct dentry *dentry, struct iattr *iattr)
1071{
1072 int retval, use_dentry = 0;
1073 struct inode *inode = d_inode(dentry);
1074 struct v9fs_inode *v9inode = V9FS_I(inode);
1075 struct v9fs_session_info *v9ses;
1076 struct p9_fid *fid = NULL;
1077 struct p9_wstat wstat;
1078
1079 p9_debug(P9_DEBUG_VFS, "\n");
1080 retval = setattr_prepare(&init_user_ns, dentry, iattr);
1081 if (retval)
1082 return retval;
1083
1084 retval = -EPERM;
1085 v9ses = v9fs_dentry2v9ses(dentry);
1086 if (iattr->ia_valid & ATTR_FILE) {
1087 fid = iattr->ia_file->private_data;
1088 WARN_ON(!fid);
1089 }
1090 if (!fid) {
1091 fid = v9fs_fid_lookup(dentry);
1092 use_dentry = 1;
1093 }
1094 if (IS_ERR(fid))
1095 return PTR_ERR(fid);
1096
1097 v9fs_blank_wstat(&wstat);
1098 if (iattr->ia_valid & ATTR_MODE)
1099 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1100
1101 if (iattr->ia_valid & ATTR_MTIME)
1102 wstat.mtime = iattr->ia_mtime.tv_sec;
1103
1104 if (iattr->ia_valid & ATTR_ATIME)
1105 wstat.atime = iattr->ia_atime.tv_sec;
1106
1107 if (iattr->ia_valid & ATTR_SIZE)
1108 wstat.length = iattr->ia_size;
1109
1110 if (v9fs_proto_dotu(v9ses)) {
1111 if (iattr->ia_valid & ATTR_UID)
1112 wstat.n_uid = iattr->ia_uid;
1113
1114 if (iattr->ia_valid & ATTR_GID)
1115 wstat.n_gid = iattr->ia_gid;
1116 }
1117
1118 /* Write all dirty data */
1119 if (d_is_reg(dentry))
1120 filemap_write_and_wait(inode->i_mapping);
1121
1122 retval = p9_client_wstat(fid, &wstat);
1123
1124 if (use_dentry)
1125 p9_fid_put(fid);
1126
1127 if (retval < 0)
1128 return retval;
1129
1130 if ((iattr->ia_valid & ATTR_SIZE) &&
1131 iattr->ia_size != i_size_read(inode)) {
1132 truncate_setsize(inode, iattr->ia_size);
1133 fscache_resize_cookie(v9fs_inode_cookie(v9inode), iattr->ia_size);
1134 }
1135
1136 v9fs_invalidate_inode_attr(inode);
1137
1138 setattr_copy(&init_user_ns, inode, iattr);
1139 mark_inode_dirty(inode);
1140 return 0;
1141}
1142
1143/**
1144 * v9fs_stat2inode - populate an inode structure with mistat info
1145 * @stat: Plan 9 metadata (mistat) structure
1146 * @inode: inode to populate
1147 * @sb: superblock of filesystem
1148 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
1149 *
1150 */
1151
1152void
1153v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1154 struct super_block *sb, unsigned int flags)
1155{
1156 umode_t mode;
1157 struct v9fs_session_info *v9ses = sb->s_fs_info;
1158 struct v9fs_inode *v9inode = V9FS_I(inode);
1159
1160 set_nlink(inode, 1);
1161
1162 inode->i_atime.tv_sec = stat->atime;
1163 inode->i_mtime.tv_sec = stat->mtime;
1164 inode->i_ctime.tv_sec = stat->mtime;
1165
1166 inode->i_uid = v9ses->dfltuid;
1167 inode->i_gid = v9ses->dfltgid;
1168
1169 if (v9fs_proto_dotu(v9ses)) {
1170 inode->i_uid = stat->n_uid;
1171 inode->i_gid = stat->n_gid;
1172 }
1173 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1174 if (v9fs_proto_dotu(v9ses)) {
1175 unsigned int i_nlink;
1176 /*
1177 * Hadlink support got added later to the .u extension.
1178 * So there can be a server out there that doesn't
1179 * support this even with .u extension. That would
1180 * just leave us with stat->extension being an empty
1181 * string, though.
1182 */
1183 /* HARDLINKCOUNT %u */
1184 if (sscanf(stat->extension,
1185 " HARDLINKCOUNT %u", &i_nlink) == 1)
1186 set_nlink(inode, i_nlink);
1187 }
1188 }
1189 mode = p9mode2perm(v9ses, stat);
1190 mode |= inode->i_mode & ~S_IALLUGO;
1191 inode->i_mode = mode;
1192
1193 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
1194 v9fs_i_size_write(inode, stat->length);
1195 /* not real number of blocks, but 512 byte ones ... */
1196 inode->i_blocks = (stat->length + 512 - 1) >> 9;
1197 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1198}
1199
1200/**
1201 * v9fs_qid2ino - convert qid into inode number
1202 * @qid: qid to hash
1203 *
1204 * BUG: potential for inode number collisions?
1205 */
1206
1207ino_t v9fs_qid2ino(struct p9_qid *qid)
1208{
1209 u64 path = qid->path + 2;
1210 ino_t i = 0;
1211
1212 if (sizeof(ino_t) == sizeof(path))
1213 memcpy(&i, &path, sizeof(ino_t));
1214 else
1215 i = (ino_t) (path ^ (path >> 32));
1216
1217 return i;
1218}
1219
1220/**
1221 * v9fs_vfs_get_link - follow a symlink path
1222 * @dentry: dentry for symlink
1223 * @inode: inode for symlink
1224 * @done: delayed call for when we are done with the return value
1225 */
1226
1227static const char *v9fs_vfs_get_link(struct dentry *dentry,
1228 struct inode *inode,
1229 struct delayed_call *done)
1230{
1231 struct v9fs_session_info *v9ses;
1232 struct p9_fid *fid;
1233 struct p9_wstat *st;
1234 char *res;
1235
1236 if (!dentry)
1237 return ERR_PTR(-ECHILD);
1238
1239 v9ses = v9fs_dentry2v9ses(dentry);
1240 if (!v9fs_proto_dotu(v9ses))
1241 return ERR_PTR(-EBADF);
1242
1243 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
1244 fid = v9fs_fid_lookup(dentry);
1245
1246 if (IS_ERR(fid))
1247 return ERR_CAST(fid);
1248
1249 st = p9_client_stat(fid);
1250 p9_fid_put(fid);
1251 if (IS_ERR(st))
1252 return ERR_CAST(st);
1253
1254 if (!(st->mode & P9_DMSYMLINK)) {
1255 p9stat_free(st);
1256 kfree(st);
1257 return ERR_PTR(-EINVAL);
1258 }
1259 res = st->extension;
1260 st->extension = NULL;
1261 if (strlen(res) >= PATH_MAX)
1262 res[PATH_MAX - 1] = '\0';
1263
1264 p9stat_free(st);
1265 kfree(st);
1266 set_delayed_call(done, kfree_link, res);
1267 return res;
1268}
1269
1270/**
1271 * v9fs_vfs_mkspecial - create a special file
1272 * @dir: inode to create special file in
1273 * @dentry: dentry to create
1274 * @perm: mode to create special file
1275 * @extension: 9p2000.u format extension string representing special file
1276 *
1277 */
1278
1279static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1280 u32 perm, const char *extension)
1281{
1282 struct p9_fid *fid;
1283 struct v9fs_session_info *v9ses;
1284
1285 v9ses = v9fs_inode2v9ses(dir);
1286 if (!v9fs_proto_dotu(v9ses)) {
1287 p9_debug(P9_DEBUG_ERROR, "not extended\n");
1288 return -EPERM;
1289 }
1290
1291 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1292 P9_OREAD);
1293 if (IS_ERR(fid))
1294 return PTR_ERR(fid);
1295
1296 v9fs_invalidate_inode_attr(dir);
1297 p9_fid_put(fid);
1298 return 0;
1299}
1300
1301/**
1302 * v9fs_vfs_symlink - helper function to create symlinks
1303 * @mnt_userns: The user namespace of the mount
1304 * @dir: directory inode containing symlink
1305 * @dentry: dentry for symlink
1306 * @symname: symlink data
1307 *
1308 * See Also: 9P2000.u RFC for more information
1309 *
1310 */
1311
1312static int
1313v9fs_vfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
1314 struct dentry *dentry, const char *symname)
1315{
1316 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n",
1317 dir->i_ino, dentry, symname);
1318
1319 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname);
1320}
1321
1322#define U32_MAX_DIGITS 10
1323
1324/**
1325 * v9fs_vfs_link - create a hardlink
1326 * @old_dentry: dentry for file to link to
1327 * @dir: inode destination for new link
1328 * @dentry: dentry for link
1329 *
1330 */
1331
1332static int
1333v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1334 struct dentry *dentry)
1335{
1336 int retval;
1337 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */
1338 struct p9_fid *oldfid;
1339
1340 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n",
1341 dir->i_ino, dentry, old_dentry);
1342
1343 oldfid = v9fs_fid_clone(old_dentry);
1344 if (IS_ERR(oldfid))
1345 return PTR_ERR(oldfid);
1346
1347 sprintf(name, "%d\n", oldfid->fid);
1348 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1349 if (!retval) {
1350 v9fs_refresh_inode(oldfid, d_inode(old_dentry));
1351 v9fs_invalidate_inode_attr(dir);
1352 }
1353 p9_fid_put(oldfid);
1354 return retval;
1355}
1356
1357/**
1358 * v9fs_vfs_mknod - create a special file
1359 * @mnt_userns: The user namespace of the mount
1360 * @dir: inode destination for new link
1361 * @dentry: dentry for file
1362 * @mode: mode for creation
1363 * @rdev: device associated with special file
1364 *
1365 */
1366
1367static int
1368v9fs_vfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
1369 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: %x 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 struct p9_wstat *st;
1399 struct v9fs_session_info *v9ses;
1400 unsigned int flags;
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_wrong_type(inode, umode))
1411 goto out;
1412
1413 /*
1414 * We don't want to refresh inode->i_size,
1415 * because we may have cached data
1416 */
1417 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
1418 V9FS_STAT2INODE_KEEP_ISIZE : 0;
1419 v9fs_stat2inode(st, inode, inode->i_sb, flags);
1420out:
1421 p9stat_free(st);
1422 kfree(st);
1423 return 0;
1424}
1425
1426static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1427 .create = v9fs_vfs_create,
1428 .lookup = v9fs_vfs_lookup,
1429 .atomic_open = v9fs_vfs_atomic_open,
1430 .symlink = v9fs_vfs_symlink,
1431 .link = v9fs_vfs_link,
1432 .unlink = v9fs_vfs_unlink,
1433 .mkdir = v9fs_vfs_mkdir,
1434 .rmdir = v9fs_vfs_rmdir,
1435 .mknod = v9fs_vfs_mknod,
1436 .rename = v9fs_vfs_rename,
1437 .getattr = v9fs_vfs_getattr,
1438 .setattr = v9fs_vfs_setattr,
1439};
1440
1441static const struct inode_operations v9fs_dir_inode_operations = {
1442 .create = v9fs_vfs_create,
1443 .lookup = v9fs_vfs_lookup,
1444 .atomic_open = v9fs_vfs_atomic_open,
1445 .unlink = v9fs_vfs_unlink,
1446 .mkdir = v9fs_vfs_mkdir,
1447 .rmdir = v9fs_vfs_rmdir,
1448 .mknod = v9fs_vfs_mknod,
1449 .rename = v9fs_vfs_rename,
1450 .getattr = v9fs_vfs_getattr,
1451 .setattr = v9fs_vfs_setattr,
1452};
1453
1454static const struct inode_operations v9fs_file_inode_operations = {
1455 .getattr = v9fs_vfs_getattr,
1456 .setattr = v9fs_vfs_setattr,
1457};
1458
1459static const struct inode_operations v9fs_symlink_inode_operations = {
1460 .get_link = v9fs_vfs_get_link,
1461 .getattr = v9fs_vfs_getattr,
1462 .setattr = v9fs_vfs_setattr,
1463};
1464