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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/*
2 * linux/fs/9p/vfs_inode.c
3 *
4 * This file contains vfs inode ops for the 9P2000 protocol.
5 *
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27
28#include <linux/module.h>
29#include <linux/errno.h>
30#include <linux/fs.h>
31#include <linux/file.h>
32#include <linux/pagemap.h>
33#include <linux/stat.h>
34#include <linux/string.h>
35#include <linux/inet.h>
36#include <linux/namei.h>
37#include <linux/idr.h>
38#include <linux/sched.h>
39#include <linux/slab.h>
40#include <linux/xattr.h>
41#include <linux/posix_acl.h>
42#include <net/9p/9p.h>
43#include <net/9p/client.h>
44
45#include "v9fs.h"
46#include "v9fs_vfs.h"
47#include "fid.h"
48#include "cache.h"
49#include "xattr.h"
50#include "acl.h"
51
52static const struct inode_operations v9fs_dir_inode_operations;
53static const struct inode_operations v9fs_dir_inode_operations_dotu;
54static const struct inode_operations v9fs_file_inode_operations;
55static const struct inode_operations v9fs_symlink_inode_operations;
56
57/**
58 * unixmode2p9mode - convert unix mode bits to plan 9
59 * @v9ses: v9fs session information
60 * @mode: mode to convert
61 *
62 */
63
64static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode)
65{
66 int res;
67 res = mode & 0777;
68 if (S_ISDIR(mode))
69 res |= P9_DMDIR;
70 if (v9fs_proto_dotu(v9ses)) {
71 if (v9ses->nodev == 0) {
72 if (S_ISSOCK(mode))
73 res |= P9_DMSOCKET;
74 if (S_ISFIFO(mode))
75 res |= P9_DMNAMEDPIPE;
76 if (S_ISBLK(mode))
77 res |= P9_DMDEVICE;
78 if (S_ISCHR(mode))
79 res |= P9_DMDEVICE;
80 }
81
82 if ((mode & S_ISUID) == S_ISUID)
83 res |= P9_DMSETUID;
84 if ((mode & S_ISGID) == S_ISGID)
85 res |= P9_DMSETGID;
86 if ((mode & S_ISVTX) == S_ISVTX)
87 res |= P9_DMSETVTX;
88 }
89 return res;
90}
91
92/**
93 * p9mode2perm- convert plan9 mode bits to unix permission bits
94 * @v9ses: v9fs session information
95 * @stat: p9_wstat from which mode need to be derived
96 *
97 */
98static int p9mode2perm(struct v9fs_session_info *v9ses,
99 struct p9_wstat *stat)
100{
101 int res;
102 int mode = stat->mode;
103
104 res = mode & S_IALLUGO;
105 if (v9fs_proto_dotu(v9ses)) {
106 if ((mode & P9_DMSETUID) == P9_DMSETUID)
107 res |= S_ISUID;
108
109 if ((mode & P9_DMSETGID) == P9_DMSETGID)
110 res |= S_ISGID;
111
112 if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
113 res |= S_ISVTX;
114 }
115 return res;
116}
117
118/**
119 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
120 * @v9ses: v9fs session information
121 * @stat: p9_wstat from which mode need to be derived
122 * @rdev: major number, minor number in case of device files.
123 *
124 */
125static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses,
126 struct p9_wstat *stat, dev_t *rdev)
127{
128 int res;
129 u32 mode = stat->mode;
130
131 *rdev = 0;
132 res = p9mode2perm(v9ses, stat);
133
134 if ((mode & P9_DMDIR) == P9_DMDIR)
135 res |= S_IFDIR;
136 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
137 res |= S_IFLNK;
138 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
139 && (v9ses->nodev == 0))
140 res |= S_IFSOCK;
141 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
142 && (v9ses->nodev == 0))
143 res |= S_IFIFO;
144 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
145 && (v9ses->nodev == 0)) {
146 char type = 0, ext[32];
147 int major = -1, minor = -1;
148
149 strlcpy(ext, stat->extension, sizeof(ext));
150 sscanf(ext, "%c %i %i", &type, &major, &minor);
151 switch (type) {
152 case 'c':
153 res |= S_IFCHR;
154 break;
155 case 'b':
156 res |= S_IFBLK;
157 break;
158 default:
159 p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n",
160 type, stat->extension);
161 };
162 *rdev = MKDEV(major, minor);
163 } else
164 res |= S_IFREG;
165
166 return res;
167}
168
169/**
170 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
171 * @uflags: flags to convert
172 * @extended: if .u extensions are active
173 */
174
175int v9fs_uflags2omode(int uflags, int extended)
176{
177 int ret;
178
179 ret = 0;
180 switch (uflags&3) {
181 default:
182 case O_RDONLY:
183 ret = P9_OREAD;
184 break;
185
186 case O_WRONLY:
187 ret = P9_OWRITE;
188 break;
189
190 case O_RDWR:
191 ret = P9_ORDWR;
192 break;
193 }
194
195 if (extended) {
196 if (uflags & O_EXCL)
197 ret |= P9_OEXCL;
198
199 if (uflags & O_APPEND)
200 ret |= P9_OAPPEND;
201 }
202
203 return ret;
204}
205
206/**
207 * v9fs_blank_wstat - helper function to setup a 9P stat structure
208 * @wstat: structure to initialize
209 *
210 */
211
212void
213v9fs_blank_wstat(struct p9_wstat *wstat)
214{
215 wstat->type = ~0;
216 wstat->dev = ~0;
217 wstat->qid.type = ~0;
218 wstat->qid.version = ~0;
219 *((long long *)&wstat->qid.path) = ~0;
220 wstat->mode = ~0;
221 wstat->atime = ~0;
222 wstat->mtime = ~0;
223 wstat->length = ~0;
224 wstat->name = NULL;
225 wstat->uid = NULL;
226 wstat->gid = NULL;
227 wstat->muid = NULL;
228 wstat->n_uid = INVALID_UID;
229 wstat->n_gid = INVALID_GID;
230 wstat->n_muid = INVALID_UID;
231 wstat->extension = NULL;
232}
233
234/**
235 * v9fs_alloc_inode - helper function to allocate an inode
236 *
237 */
238struct inode *v9fs_alloc_inode(struct super_block *sb)
239{
240 struct v9fs_inode *v9inode;
241 v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache,
242 GFP_KERNEL);
243 if (!v9inode)
244 return NULL;
245#ifdef CONFIG_9P_FSCACHE
246 v9inode->fscache = NULL;
247 mutex_init(&v9inode->fscache_lock);
248#endif
249 v9inode->writeback_fid = NULL;
250 v9inode->cache_validity = 0;
251 mutex_init(&v9inode->v_mutex);
252 return &v9inode->vfs_inode;
253}
254
255/**
256 * v9fs_destroy_inode - destroy an inode
257 *
258 */
259
260static void v9fs_i_callback(struct rcu_head *head)
261{
262 struct inode *inode = container_of(head, struct inode, i_rcu);
263 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
264}
265
266void v9fs_destroy_inode(struct inode *inode)
267{
268 call_rcu(&inode->i_rcu, v9fs_i_callback);
269}
270
271int v9fs_init_inode(struct v9fs_session_info *v9ses,
272 struct inode *inode, umode_t mode, dev_t rdev)
273{
274 int err = 0;
275
276 inode_init_owner(inode, NULL, mode);
277 inode->i_blocks = 0;
278 inode->i_rdev = rdev;
279 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
280 inode->i_mapping->a_ops = &v9fs_addr_operations;
281
282 switch (mode & S_IFMT) {
283 case S_IFIFO:
284 case S_IFBLK:
285 case S_IFCHR:
286 case S_IFSOCK:
287 if (v9fs_proto_dotl(v9ses)) {
288 inode->i_op = &v9fs_file_inode_operations_dotl;
289 } else if (v9fs_proto_dotu(v9ses)) {
290 inode->i_op = &v9fs_file_inode_operations;
291 } else {
292 p9_debug(P9_DEBUG_ERROR,
293 "special files without extended mode\n");
294 err = -EINVAL;
295 goto error;
296 }
297 init_special_inode(inode, inode->i_mode, inode->i_rdev);
298 break;
299 case S_IFREG:
300 if (v9fs_proto_dotl(v9ses)) {
301 inode->i_op = &v9fs_file_inode_operations_dotl;
302 if (v9ses->cache == CACHE_LOOSE ||
303 v9ses->cache == CACHE_FSCACHE)
304 inode->i_fop =
305 &v9fs_cached_file_operations_dotl;
306 else if (v9ses->cache == CACHE_MMAP)
307 inode->i_fop = &v9fs_mmap_file_operations_dotl;
308 else
309 inode->i_fop = &v9fs_file_operations_dotl;
310 } else {
311 inode->i_op = &v9fs_file_inode_operations;
312 if (v9ses->cache == CACHE_LOOSE ||
313 v9ses->cache == CACHE_FSCACHE)
314 inode->i_fop =
315 &v9fs_cached_file_operations;
316 else if (v9ses->cache == CACHE_MMAP)
317 inode->i_fop = &v9fs_mmap_file_operations;
318 else
319 inode->i_fop = &v9fs_file_operations;
320 }
321
322 break;
323 case S_IFLNK:
324 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
325 p9_debug(P9_DEBUG_ERROR,
326 "extended modes used with legacy protocol\n");
327 err = -EINVAL;
328 goto error;
329 }
330
331 if (v9fs_proto_dotl(v9ses))
332 inode->i_op = &v9fs_symlink_inode_operations_dotl;
333 else
334 inode->i_op = &v9fs_symlink_inode_operations;
335
336 break;
337 case S_IFDIR:
338 inc_nlink(inode);
339 if (v9fs_proto_dotl(v9ses))
340 inode->i_op = &v9fs_dir_inode_operations_dotl;
341 else if (v9fs_proto_dotu(v9ses))
342 inode->i_op = &v9fs_dir_inode_operations_dotu;
343 else
344 inode->i_op = &v9fs_dir_inode_operations;
345
346 if (v9fs_proto_dotl(v9ses))
347 inode->i_fop = &v9fs_dir_operations_dotl;
348 else
349 inode->i_fop = &v9fs_dir_operations;
350
351 break;
352 default:
353 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n",
354 mode, mode & S_IFMT);
355 err = -EINVAL;
356 goto error;
357 }
358error:
359 return err;
360
361}
362
363/**
364 * v9fs_get_inode - helper function to setup an inode
365 * @sb: superblock
366 * @mode: mode to setup inode with
367 *
368 */
369
370struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev)
371{
372 int err;
373 struct inode *inode;
374 struct v9fs_session_info *v9ses = sb->s_fs_info;
375
376 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode);
377
378 inode = new_inode(sb);
379 if (!inode) {
380 pr_warn("%s (%d): Problem allocating inode\n",
381 __func__, task_pid_nr(current));
382 return ERR_PTR(-ENOMEM);
383 }
384 err = v9fs_init_inode(v9ses, inode, mode, rdev);
385 if (err) {
386 iput(inode);
387 return ERR_PTR(err);
388 }
389 return inode;
390}
391
392/*
393static struct v9fs_fid*
394v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
395{
396 int err;
397 int nfid;
398 struct v9fs_fid *ret;
399 struct v9fs_fcall *fcall;
400
401 nfid = v9fs_get_idpool(&v9ses->fidpool);
402 if (nfid < 0) {
403 eprintk(KERN_WARNING, "no free fids available\n");
404 return ERR_PTR(-ENOSPC);
405 }
406
407 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
408 &fcall);
409
410 if (err < 0) {
411 if (fcall && fcall->id == RWALK)
412 goto clunk_fid;
413
414 PRINT_FCALL_ERROR("walk error", fcall);
415 v9fs_put_idpool(nfid, &v9ses->fidpool);
416 goto error;
417 }
418
419 kfree(fcall);
420 fcall = NULL;
421 ret = v9fs_fid_create(v9ses, nfid);
422 if (!ret) {
423 err = -ENOMEM;
424 goto clunk_fid;
425 }
426
427 err = v9fs_fid_insert(ret, dentry);
428 if (err < 0) {
429 v9fs_fid_destroy(ret);
430 goto clunk_fid;
431 }
432
433 return ret;
434
435clunk_fid:
436 v9fs_t_clunk(v9ses, nfid);
437
438error:
439 kfree(fcall);
440 return ERR_PTR(err);
441}
442*/
443
444
445/**
446 * v9fs_clear_inode - release an inode
447 * @inode: inode to release
448 *
449 */
450void v9fs_evict_inode(struct inode *inode)
451{
452 struct v9fs_inode *v9inode = V9FS_I(inode);
453
454 truncate_inode_pages_final(&inode->i_data);
455 clear_inode(inode);
456 filemap_fdatawrite(&inode->i_data);
457
458 v9fs_cache_inode_put_cookie(inode);
459 /* clunk the fid stashed in writeback_fid */
460 if (v9inode->writeback_fid) {
461 p9_client_clunk(v9inode->writeback_fid);
462 v9inode->writeback_fid = NULL;
463 }
464}
465
466static int v9fs_test_inode(struct inode *inode, void *data)
467{
468 int umode;
469 dev_t rdev;
470 struct v9fs_inode *v9inode = V9FS_I(inode);
471 struct p9_wstat *st = (struct p9_wstat *)data;
472 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
473
474 umode = p9mode2unixmode(v9ses, st, &rdev);
475 /* don't match inode of different type */
476 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
477 return 0;
478
479 /* compare qid details */
480 if (memcmp(&v9inode->qid.version,
481 &st->qid.version, sizeof(v9inode->qid.version)))
482 return 0;
483
484 if (v9inode->qid.type != st->qid.type)
485 return 0;
486
487 if (v9inode->qid.path != st->qid.path)
488 return 0;
489 return 1;
490}
491
492static int v9fs_test_new_inode(struct inode *inode, void *data)
493{
494 return 0;
495}
496
497static int v9fs_set_inode(struct inode *inode, void *data)
498{
499 struct v9fs_inode *v9inode = V9FS_I(inode);
500 struct p9_wstat *st = (struct p9_wstat *)data;
501
502 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
503 return 0;
504}
505
506static struct inode *v9fs_qid_iget(struct super_block *sb,
507 struct p9_qid *qid,
508 struct p9_wstat *st,
509 int new)
510{
511 dev_t rdev;
512 int retval;
513 umode_t umode;
514 unsigned long i_ino;
515 struct inode *inode;
516 struct v9fs_session_info *v9ses = sb->s_fs_info;
517 int (*test)(struct inode *, void *);
518
519 if (new)
520 test = v9fs_test_new_inode;
521 else
522 test = v9fs_test_inode;
523
524 i_ino = v9fs_qid2ino(qid);
525 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
526 if (!inode)
527 return ERR_PTR(-ENOMEM);
528 if (!(inode->i_state & I_NEW))
529 return inode;
530 /*
531 * initialize the inode with the stat info
532 * FIXME!! we may need support for stale inodes
533 * later.
534 */
535 inode->i_ino = i_ino;
536 umode = p9mode2unixmode(v9ses, st, &rdev);
537 retval = v9fs_init_inode(v9ses, inode, umode, rdev);
538 if (retval)
539 goto error;
540
541 v9fs_stat2inode(st, inode, sb);
542 v9fs_cache_inode_get_cookie(inode);
543 unlock_new_inode(inode);
544 return inode;
545error:
546 iget_failed(inode);
547 return ERR_PTR(retval);
548
549}
550
551struct inode *
552v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
553 struct super_block *sb, int new)
554{
555 struct p9_wstat *st;
556 struct inode *inode = NULL;
557
558 st = p9_client_stat(fid);
559 if (IS_ERR(st))
560 return ERR_CAST(st);
561
562 inode = v9fs_qid_iget(sb, &st->qid, st, new);
563 p9stat_free(st);
564 kfree(st);
565 return inode;
566}
567
568/**
569 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
570 * plan 9 AT flag.
571 * @flags: flags to convert
572 */
573static int v9fs_at_to_dotl_flags(int flags)
574{
575 int rflags = 0;
576 if (flags & AT_REMOVEDIR)
577 rflags |= P9_DOTL_AT_REMOVEDIR;
578 return rflags;
579}
580
581/**
582 * v9fs_dec_count - helper functon to drop i_nlink.
583 *
584 * If a directory had nlink <= 2 (including . and ..), then we should not drop
585 * the link count, which indicates the underlying exported fs doesn't maintain
586 * nlink accurately. e.g.
587 * - overlayfs sets nlink to 1 for merged dir
588 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more
589 * than EXT4_LINK_MAX (65000) links.
590 *
591 * @inode: inode whose nlink is being dropped
592 */
593static void v9fs_dec_count(struct inode *inode)
594{
595 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2)
596 drop_nlink(inode);
597}
598
599/**
600 * v9fs_remove - helper function to remove files and directories
601 * @dir: directory inode that is being deleted
602 * @dentry: dentry that is being deleted
603 * @flags: removing a directory
604 *
605 */
606
607static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
608{
609 struct inode *inode;
610 int retval = -EOPNOTSUPP;
611 struct p9_fid *v9fid, *dfid;
612 struct v9fs_session_info *v9ses;
613
614 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
615 dir, dentry, flags);
616
617 v9ses = v9fs_inode2v9ses(dir);
618 inode = d_inode(dentry);
619 dfid = v9fs_parent_fid(dentry);
620 if (IS_ERR(dfid)) {
621 retval = PTR_ERR(dfid);
622 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
623 return retval;
624 }
625 if (v9fs_proto_dotl(v9ses))
626 retval = p9_client_unlinkat(dfid, dentry->d_name.name,
627 v9fs_at_to_dotl_flags(flags));
628 if (retval == -EOPNOTSUPP) {
629 /* Try the one based on path */
630 v9fid = v9fs_fid_clone(dentry);
631 if (IS_ERR(v9fid))
632 return PTR_ERR(v9fid);
633 retval = p9_client_remove(v9fid);
634 }
635 if (!retval) {
636 /*
637 * directories on unlink should have zero
638 * link count
639 */
640 if (flags & AT_REMOVEDIR) {
641 clear_nlink(inode);
642 v9fs_dec_count(dir);
643 } else
644 v9fs_dec_count(inode);
645
646 v9fs_invalidate_inode_attr(inode);
647 v9fs_invalidate_inode_attr(dir);
648 }
649 return retval;
650}
651
652/**
653 * v9fs_create - Create a file
654 * @v9ses: session information
655 * @dir: directory that dentry is being created in
656 * @dentry: dentry that is being created
657 * @extension: 9p2000.u extension string to support devices, etc.
658 * @perm: create permissions
659 * @mode: open mode
660 *
661 */
662static struct p9_fid *
663v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
664 struct dentry *dentry, char *extension, u32 perm, u8 mode)
665{
666 int err;
667 const unsigned char *name;
668 struct p9_fid *dfid, *ofid, *fid;
669 struct inode *inode;
670
671 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
672
673 err = 0;
674 ofid = NULL;
675 fid = NULL;
676 name = dentry->d_name.name;
677 dfid = v9fs_parent_fid(dentry);
678 if (IS_ERR(dfid)) {
679 err = PTR_ERR(dfid);
680 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
681 return ERR_PTR(err);
682 }
683
684 /* clone a fid to use for creation */
685 ofid = clone_fid(dfid);
686 if (IS_ERR(ofid)) {
687 err = PTR_ERR(ofid);
688 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
689 return ERR_PTR(err);
690 }
691
692 err = p9_client_fcreate(ofid, name, perm, mode, extension);
693 if (err < 0) {
694 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
695 goto error;
696 }
697
698 if (!(perm & P9_DMLINK)) {
699 /* now walk from the parent so we can get unopened fid */
700 fid = p9_client_walk(dfid, 1, &name, 1);
701 if (IS_ERR(fid)) {
702 err = PTR_ERR(fid);
703 p9_debug(P9_DEBUG_VFS,
704 "p9_client_walk failed %d\n", err);
705 fid = NULL;
706 goto error;
707 }
708 /*
709 * instantiate inode and assign the unopened fid to the dentry
710 */
711 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
712 if (IS_ERR(inode)) {
713 err = PTR_ERR(inode);
714 p9_debug(P9_DEBUG_VFS,
715 "inode creation failed %d\n", err);
716 goto error;
717 }
718 v9fs_fid_add(dentry, fid);
719 d_instantiate(dentry, inode);
720 }
721 return ofid;
722error:
723 if (ofid)
724 p9_client_clunk(ofid);
725
726 if (fid)
727 p9_client_clunk(fid);
728
729 return ERR_PTR(err);
730}
731
732/**
733 * v9fs_vfs_create - VFS hook to create a regular file
734 *
735 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called
736 * for mknod(2).
737 *
738 * @dir: directory inode that is being created
739 * @dentry: dentry that is being deleted
740 * @mode: create permissions
741 *
742 */
743
744static int
745v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
746 bool excl)
747{
748 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
749 u32 perm = unixmode2p9mode(v9ses, mode);
750 struct p9_fid *fid;
751
752 /* P9_OEXCL? */
753 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR);
754 if (IS_ERR(fid))
755 return PTR_ERR(fid);
756
757 v9fs_invalidate_inode_attr(dir);
758 p9_client_clunk(fid);
759
760 return 0;
761}
762
763/**
764 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
765 * @dir: inode that is being unlinked
766 * @dentry: dentry that is being unlinked
767 * @mode: mode for new directory
768 *
769 */
770
771static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
772{
773 int err;
774 u32 perm;
775 struct p9_fid *fid;
776 struct v9fs_session_info *v9ses;
777
778 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
779 err = 0;
780 v9ses = v9fs_inode2v9ses(dir);
781 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
782 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
783 if (IS_ERR(fid)) {
784 err = PTR_ERR(fid);
785 fid = NULL;
786 } else {
787 inc_nlink(dir);
788 v9fs_invalidate_inode_attr(dir);
789 }
790
791 if (fid)
792 p9_client_clunk(fid);
793
794 return err;
795}
796
797/**
798 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
799 * @dir: inode that is being walked from
800 * @dentry: dentry that is being walked to?
801 * @flags: lookup flags (unused)
802 *
803 */
804
805struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
806 unsigned int flags)
807{
808 struct dentry *res;
809 struct v9fs_session_info *v9ses;
810 struct p9_fid *dfid, *fid;
811 struct inode *inode;
812 const unsigned char *name;
813
814 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n",
815 dir, dentry, dentry, flags);
816
817 if (dentry->d_name.len > NAME_MAX)
818 return ERR_PTR(-ENAMETOOLONG);
819
820 v9ses = v9fs_inode2v9ses(dir);
821 /* We can walk d_parent because we hold the dir->i_mutex */
822 dfid = v9fs_parent_fid(dentry);
823 if (IS_ERR(dfid))
824 return ERR_CAST(dfid);
825
826 name = dentry->d_name.name;
827 fid = p9_client_walk(dfid, 1, &name, 1);
828 if (IS_ERR(fid)) {
829 if (fid == ERR_PTR(-ENOENT)) {
830 d_add(dentry, NULL);
831 return NULL;
832 }
833 return ERR_CAST(fid);
834 }
835 /*
836 * Make sure we don't use a wrong inode due to parallel
837 * unlink. For cached mode create calls request for new
838 * inode. But with cache disabled, lookup should do this.
839 */
840 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
841 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
842 else
843 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
844 if (IS_ERR(inode)) {
845 p9_client_clunk(fid);
846 return ERR_CAST(inode);
847 }
848 /*
849 * If we had a rename on the server and a parallel lookup
850 * for the new name, then make sure we instantiate with
851 * the new name. ie look up for a/b, while on server somebody
852 * moved b under k and client parallely did a lookup for
853 * k/b.
854 */
855 res = d_splice_alias(inode, dentry);
856 if (!res)
857 v9fs_fid_add(dentry, fid);
858 else if (!IS_ERR(res))
859 v9fs_fid_add(res, fid);
860 else
861 p9_client_clunk(fid);
862 return res;
863}
864
865static int
866v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
867 struct file *file, unsigned flags, umode_t mode,
868 int *opened)
869{
870 int err;
871 u32 perm;
872 struct v9fs_inode *v9inode;
873 struct v9fs_session_info *v9ses;
874 struct p9_fid *fid, *inode_fid;
875 struct dentry *res = NULL;
876
877 if (d_in_lookup(dentry)) {
878 res = v9fs_vfs_lookup(dir, dentry, 0);
879 if (IS_ERR(res))
880 return PTR_ERR(res);
881
882 if (res)
883 dentry = res;
884 }
885
886 /* Only creates */
887 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
888 return finish_no_open(file, res);
889
890 err = 0;
891
892 v9ses = v9fs_inode2v9ses(dir);
893 perm = unixmode2p9mode(v9ses, mode);
894 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
895 v9fs_uflags2omode(flags,
896 v9fs_proto_dotu(v9ses)));
897 if (IS_ERR(fid)) {
898 err = PTR_ERR(fid);
899 fid = NULL;
900 goto error;
901 }
902
903 v9fs_invalidate_inode_attr(dir);
904 v9inode = V9FS_I(d_inode(dentry));
905 mutex_lock(&v9inode->v_mutex);
906 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
907 !v9inode->writeback_fid &&
908 ((flags & O_ACCMODE) != O_RDONLY)) {
909 /*
910 * clone a fid and add it to writeback_fid
911 * we do it during open time instead of
912 * page dirty time via write_begin/page_mkwrite
913 * because we want write after unlink usecase
914 * to work.
915 */
916 inode_fid = v9fs_writeback_fid(dentry);
917 if (IS_ERR(inode_fid)) {
918 err = PTR_ERR(inode_fid);
919 mutex_unlock(&v9inode->v_mutex);
920 goto error;
921 }
922 v9inode->writeback_fid = (void *) inode_fid;
923 }
924 mutex_unlock(&v9inode->v_mutex);
925 err = finish_open(file, dentry, generic_file_open, opened);
926 if (err)
927 goto error;
928
929 file->private_data = fid;
930 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
931 v9fs_cache_inode_set_cookie(d_inode(dentry), file);
932
933 *opened |= FILE_CREATED;
934out:
935 dput(res);
936 return err;
937
938error:
939 if (fid)
940 p9_client_clunk(fid);
941 goto out;
942}
943
944/**
945 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
946 * @i: inode that is being unlinked
947 * @d: dentry that is being unlinked
948 *
949 */
950
951int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
952{
953 return v9fs_remove(i, d, 0);
954}
955
956/**
957 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
958 * @i: inode that is being unlinked
959 * @d: dentry that is being unlinked
960 *
961 */
962
963int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
964{
965 return v9fs_remove(i, d, AT_REMOVEDIR);
966}
967
968/**
969 * v9fs_vfs_rename - VFS hook to rename an inode
970 * @old_dir: old dir inode
971 * @old_dentry: old dentry
972 * @new_dir: new dir inode
973 * @new_dentry: new dentry
974 *
975 */
976
977int
978v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
979 struct inode *new_dir, struct dentry *new_dentry,
980 unsigned int flags)
981{
982 int retval;
983 struct inode *old_inode;
984 struct inode *new_inode;
985 struct v9fs_session_info *v9ses;
986 struct p9_fid *oldfid;
987 struct p9_fid *olddirfid;
988 struct p9_fid *newdirfid;
989 struct p9_wstat wstat;
990
991 if (flags)
992 return -EINVAL;
993
994 p9_debug(P9_DEBUG_VFS, "\n");
995 retval = 0;
996 old_inode = d_inode(old_dentry);
997 new_inode = d_inode(new_dentry);
998 v9ses = v9fs_inode2v9ses(old_inode);
999 oldfid = v9fs_fid_lookup(old_dentry);
1000 if (IS_ERR(oldfid))
1001 return PTR_ERR(oldfid);
1002
1003 olddirfid = clone_fid(v9fs_parent_fid(old_dentry));
1004 if (IS_ERR(olddirfid)) {
1005 retval = PTR_ERR(olddirfid);
1006 goto done;
1007 }
1008
1009 newdirfid = clone_fid(v9fs_parent_fid(new_dentry));
1010 if (IS_ERR(newdirfid)) {
1011 retval = PTR_ERR(newdirfid);
1012 goto clunk_olddir;
1013 }
1014
1015 down_write(&v9ses->rename_sem);
1016 if (v9fs_proto_dotl(v9ses)) {
1017 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
1018 newdirfid, new_dentry->d_name.name);
1019 if (retval == -EOPNOTSUPP)
1020 retval = p9_client_rename(oldfid, newdirfid,
1021 new_dentry->d_name.name);
1022 if (retval != -EOPNOTSUPP)
1023 goto clunk_newdir;
1024 }
1025 if (old_dentry->d_parent != new_dentry->d_parent) {
1026 /*
1027 * 9P .u can only handle file rename in the same directory
1028 */
1029
1030 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
1031 retval = -EXDEV;
1032 goto clunk_newdir;
1033 }
1034 v9fs_blank_wstat(&wstat);
1035 wstat.muid = v9ses->uname;
1036 wstat.name = new_dentry->d_name.name;
1037 retval = p9_client_wstat(oldfid, &wstat);
1038
1039clunk_newdir:
1040 if (!retval) {
1041 if (new_inode) {
1042 if (S_ISDIR(new_inode->i_mode))
1043 clear_nlink(new_inode);
1044 else
1045 v9fs_dec_count(new_inode);
1046 }
1047 if (S_ISDIR(old_inode->i_mode)) {
1048 if (!new_inode)
1049 inc_nlink(new_dir);
1050 v9fs_dec_count(old_dir);
1051 }
1052 v9fs_invalidate_inode_attr(old_inode);
1053 v9fs_invalidate_inode_attr(old_dir);
1054 v9fs_invalidate_inode_attr(new_dir);
1055
1056 /* successful rename */
1057 d_move(old_dentry, new_dentry);
1058 }
1059 up_write(&v9ses->rename_sem);
1060 p9_client_clunk(newdirfid);
1061
1062clunk_olddir:
1063 p9_client_clunk(olddirfid);
1064
1065done:
1066 return retval;
1067}
1068
1069/**
1070 * v9fs_vfs_getattr - retrieve file metadata
1071 * @path: Object to query
1072 * @stat: metadata structure to populate
1073 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
1074 * @flags: AT_STATX_xxx setting
1075 *
1076 */
1077
1078static int
1079v9fs_vfs_getattr(const struct path *path, struct kstat *stat,
1080 u32 request_mask, unsigned int flags)
1081{
1082 struct dentry *dentry = path->dentry;
1083 struct v9fs_session_info *v9ses;
1084 struct p9_fid *fid;
1085 struct p9_wstat *st;
1086
1087 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1088 v9ses = v9fs_dentry2v9ses(dentry);
1089 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1090 generic_fillattr(d_inode(dentry), stat);
1091 return 0;
1092 }
1093 fid = v9fs_fid_lookup(dentry);
1094 if (IS_ERR(fid))
1095 return PTR_ERR(fid);
1096
1097 st = p9_client_stat(fid);
1098 if (IS_ERR(st))
1099 return PTR_ERR(st);
1100
1101 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb);
1102 generic_fillattr(d_inode(dentry), stat);
1103
1104 p9stat_free(st);
1105 kfree(st);
1106 return 0;
1107}
1108
1109/**
1110 * v9fs_vfs_setattr - set file metadata
1111 * @dentry: file whose metadata to set
1112 * @iattr: metadata assignment structure
1113 *
1114 */
1115
1116static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
1117{
1118 int retval;
1119 struct v9fs_session_info *v9ses;
1120 struct p9_fid *fid;
1121 struct p9_wstat wstat;
1122
1123 p9_debug(P9_DEBUG_VFS, "\n");
1124 retval = setattr_prepare(dentry, iattr);
1125 if (retval)
1126 return retval;
1127
1128 retval = -EPERM;
1129 v9ses = v9fs_dentry2v9ses(dentry);
1130 fid = v9fs_fid_lookup(dentry);
1131 if(IS_ERR(fid))
1132 return PTR_ERR(fid);
1133
1134 v9fs_blank_wstat(&wstat);
1135 if (iattr->ia_valid & ATTR_MODE)
1136 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1137
1138 if (iattr->ia_valid & ATTR_MTIME)
1139 wstat.mtime = iattr->ia_mtime.tv_sec;
1140
1141 if (iattr->ia_valid & ATTR_ATIME)
1142 wstat.atime = iattr->ia_atime.tv_sec;
1143
1144 if (iattr->ia_valid & ATTR_SIZE)
1145 wstat.length = iattr->ia_size;
1146
1147 if (v9fs_proto_dotu(v9ses)) {
1148 if (iattr->ia_valid & ATTR_UID)
1149 wstat.n_uid = iattr->ia_uid;
1150
1151 if (iattr->ia_valid & ATTR_GID)
1152 wstat.n_gid = iattr->ia_gid;
1153 }
1154
1155 /* Write all dirty data */
1156 if (d_is_reg(dentry))
1157 filemap_write_and_wait(d_inode(dentry)->i_mapping);
1158
1159 retval = p9_client_wstat(fid, &wstat);
1160 if (retval < 0)
1161 return retval;
1162
1163 if ((iattr->ia_valid & ATTR_SIZE) &&
1164 iattr->ia_size != i_size_read(d_inode(dentry)))
1165 truncate_setsize(d_inode(dentry), iattr->ia_size);
1166
1167 v9fs_invalidate_inode_attr(d_inode(dentry));
1168
1169 setattr_copy(d_inode(dentry), iattr);
1170 mark_inode_dirty(d_inode(dentry));
1171 return 0;
1172}
1173
1174/**
1175 * v9fs_stat2inode - populate an inode structure with mistat info
1176 * @stat: Plan 9 metadata (mistat) structure
1177 * @inode: inode to populate
1178 * @sb: superblock of filesystem
1179 *
1180 */
1181
1182void
1183v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1184 struct super_block *sb)
1185{
1186 umode_t mode;
1187 char ext[32];
1188 char tag_name[14];
1189 unsigned int i_nlink;
1190 struct v9fs_session_info *v9ses = sb->s_fs_info;
1191 struct v9fs_inode *v9inode = V9FS_I(inode);
1192
1193 set_nlink(inode, 1);
1194
1195 inode->i_atime.tv_sec = stat->atime;
1196 inode->i_mtime.tv_sec = stat->mtime;
1197 inode->i_ctime.tv_sec = stat->mtime;
1198
1199 inode->i_uid = v9ses->dfltuid;
1200 inode->i_gid = v9ses->dfltgid;
1201
1202 if (v9fs_proto_dotu(v9ses)) {
1203 inode->i_uid = stat->n_uid;
1204 inode->i_gid = stat->n_gid;
1205 }
1206 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1207 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1208 /*
1209 * Hadlink support got added later to
1210 * to the .u extension. So there can be
1211 * server out there that doesn't support
1212 * this even with .u extension. So check
1213 * for non NULL stat->extension
1214 */
1215 strlcpy(ext, stat->extension, sizeof(ext));
1216 /* HARDLINKCOUNT %u */
1217 sscanf(ext, "%13s %u", tag_name, &i_nlink);
1218 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1219 set_nlink(inode, i_nlink);
1220 }
1221 }
1222 mode = p9mode2perm(v9ses, stat);
1223 mode |= inode->i_mode & ~S_IALLUGO;
1224 inode->i_mode = mode;
1225 i_size_write(inode, stat->length);
1226
1227 /* not real number of blocks, but 512 byte ones ... */
1228 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
1229 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1230}
1231
1232/**
1233 * v9fs_qid2ino - convert qid into inode number
1234 * @qid: qid to hash
1235 *
1236 * BUG: potential for inode number collisions?
1237 */
1238
1239ino_t v9fs_qid2ino(struct p9_qid *qid)
1240{
1241 u64 path = qid->path + 2;
1242 ino_t i = 0;
1243
1244 if (sizeof(ino_t) == sizeof(path))
1245 memcpy(&i, &path, sizeof(ino_t));
1246 else
1247 i = (ino_t) (path ^ (path >> 32));
1248
1249 return i;
1250}
1251
1252/**
1253 * v9fs_vfs_get_link - follow a symlink path
1254 * @dentry: dentry for symlink
1255 * @inode: inode for symlink
1256 * @done: delayed call for when we are done with the return value
1257 */
1258
1259static const char *v9fs_vfs_get_link(struct dentry *dentry,
1260 struct inode *inode,
1261 struct delayed_call *done)
1262{
1263 struct v9fs_session_info *v9ses;
1264 struct p9_fid *fid;
1265 struct p9_wstat *st;
1266 char *res;
1267
1268 if (!dentry)
1269 return ERR_PTR(-ECHILD);
1270
1271 v9ses = v9fs_dentry2v9ses(dentry);
1272 fid = v9fs_fid_lookup(dentry);
1273 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
1274
1275 if (IS_ERR(fid))
1276 return ERR_CAST(fid);
1277
1278 if (!v9fs_proto_dotu(v9ses))
1279 return ERR_PTR(-EBADF);
1280
1281 st = p9_client_stat(fid);
1282 if (IS_ERR(st))
1283 return ERR_CAST(st);
1284
1285 if (!(st->mode & P9_DMSYMLINK)) {
1286 p9stat_free(st);
1287 kfree(st);
1288 return ERR_PTR(-EINVAL);
1289 }
1290 res = st->extension;
1291 st->extension = NULL;
1292 if (strlen(res) >= PATH_MAX)
1293 res[PATH_MAX - 1] = '\0';
1294
1295 p9stat_free(st);
1296 kfree(st);
1297 set_delayed_call(done, kfree_link, res);
1298 return res;
1299}
1300
1301/**
1302 * v9fs_vfs_mkspecial - create a special file
1303 * @dir: inode to create special file in
1304 * @dentry: dentry to create
1305 * @perm: mode to create special file
1306 * @extension: 9p2000.u format extension string representing special file
1307 *
1308 */
1309
1310static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1311 u32 perm, const char *extension)
1312{
1313 struct p9_fid *fid;
1314 struct v9fs_session_info *v9ses;
1315
1316 v9ses = v9fs_inode2v9ses(dir);
1317 if (!v9fs_proto_dotu(v9ses)) {
1318 p9_debug(P9_DEBUG_ERROR, "not extended\n");
1319 return -EPERM;
1320 }
1321
1322 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1323 P9_OREAD);
1324 if (IS_ERR(fid))
1325 return PTR_ERR(fid);
1326
1327 v9fs_invalidate_inode_attr(dir);
1328 p9_client_clunk(fid);
1329 return 0;
1330}
1331
1332/**
1333 * v9fs_vfs_symlink - helper function to create symlinks
1334 * @dir: directory inode containing symlink
1335 * @dentry: dentry for symlink
1336 * @symname: symlink data
1337 *
1338 * See Also: 9P2000.u RFC for more information
1339 *
1340 */
1341
1342static int
1343v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1344{
1345 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n",
1346 dir->i_ino, dentry, symname);
1347
1348 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname);
1349}
1350
1351#define U32_MAX_DIGITS 10
1352
1353/**
1354 * v9fs_vfs_link - create a hardlink
1355 * @old_dentry: dentry for file to link to
1356 * @dir: inode destination for new link
1357 * @dentry: dentry for link
1358 *
1359 */
1360
1361static int
1362v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1363 struct dentry *dentry)
1364{
1365 int retval;
1366 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */
1367 struct p9_fid *oldfid;
1368
1369 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n",
1370 dir->i_ino, dentry, old_dentry);
1371
1372 oldfid = v9fs_fid_clone(old_dentry);
1373 if (IS_ERR(oldfid))
1374 return PTR_ERR(oldfid);
1375
1376 sprintf(name, "%d\n", oldfid->fid);
1377 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1378 if (!retval) {
1379 v9fs_refresh_inode(oldfid, d_inode(old_dentry));
1380 v9fs_invalidate_inode_attr(dir);
1381 }
1382 p9_client_clunk(oldfid);
1383 return retval;
1384}
1385
1386/**
1387 * v9fs_vfs_mknod - create a special file
1388 * @dir: inode destination for new link
1389 * @dentry: dentry for file
1390 * @mode: mode for creation
1391 * @rdev: device associated with special file
1392 *
1393 */
1394
1395static int
1396v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
1397{
1398 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1399 int retval;
1400 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1];
1401 u32 perm;
1402
1403 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
1404 dir->i_ino, dentry, mode,
1405 MAJOR(rdev), MINOR(rdev));
1406
1407 /* build extension */
1408 if (S_ISBLK(mode))
1409 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1410 else if (S_ISCHR(mode))
1411 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1412 else
1413 *name = 0;
1414
1415 perm = unixmode2p9mode(v9ses, mode);
1416 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name);
1417
1418 return retval;
1419}
1420
1421int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1422{
1423 int umode;
1424 dev_t rdev;
1425 loff_t i_size;
1426 struct p9_wstat *st;
1427 struct v9fs_session_info *v9ses;
1428
1429 v9ses = v9fs_inode2v9ses(inode);
1430 st = p9_client_stat(fid);
1431 if (IS_ERR(st))
1432 return PTR_ERR(st);
1433 /*
1434 * Don't update inode if the file type is different
1435 */
1436 umode = p9mode2unixmode(v9ses, st, &rdev);
1437 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
1438 goto out;
1439
1440 spin_lock(&inode->i_lock);
1441 /*
1442 * We don't want to refresh inode->i_size,
1443 * because we may have cached data
1444 */
1445 i_size = inode->i_size;
1446 v9fs_stat2inode(st, inode, inode->i_sb);
1447 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
1448 inode->i_size = i_size;
1449 spin_unlock(&inode->i_lock);
1450out:
1451 p9stat_free(st);
1452 kfree(st);
1453 return 0;
1454}
1455
1456static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1457 .create = v9fs_vfs_create,
1458 .lookup = v9fs_vfs_lookup,
1459 .atomic_open = v9fs_vfs_atomic_open,
1460 .symlink = v9fs_vfs_symlink,
1461 .link = v9fs_vfs_link,
1462 .unlink = v9fs_vfs_unlink,
1463 .mkdir = v9fs_vfs_mkdir,
1464 .rmdir = v9fs_vfs_rmdir,
1465 .mknod = v9fs_vfs_mknod,
1466 .rename = v9fs_vfs_rename,
1467 .getattr = v9fs_vfs_getattr,
1468 .setattr = v9fs_vfs_setattr,
1469};
1470
1471static const struct inode_operations v9fs_dir_inode_operations = {
1472 .create = v9fs_vfs_create,
1473 .lookup = v9fs_vfs_lookup,
1474 .atomic_open = v9fs_vfs_atomic_open,
1475 .unlink = v9fs_vfs_unlink,
1476 .mkdir = v9fs_vfs_mkdir,
1477 .rmdir = v9fs_vfs_rmdir,
1478 .mknod = v9fs_vfs_mknod,
1479 .rename = v9fs_vfs_rename,
1480 .getattr = v9fs_vfs_getattr,
1481 .setattr = v9fs_vfs_setattr,
1482};
1483
1484static const struct inode_operations v9fs_file_inode_operations = {
1485 .getattr = v9fs_vfs_getattr,
1486 .setattr = v9fs_vfs_setattr,
1487};
1488
1489static const struct inode_operations v9fs_symlink_inode_operations = {
1490 .get_link = v9fs_vfs_get_link,
1491 .getattr = v9fs_vfs_getattr,
1492 .setattr = v9fs_vfs_setattr,
1493};
1494