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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/fs/9p/vfs_inode.c
4 *
5 * This file contains vfs inode ops for the 9P2000 protocol.
6 *
7 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
8 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/module.h>
14#include <linux/errno.h>
15#include <linux/fs.h>
16#include <linux/file.h>
17#include <linux/pagemap.h>
18#include <linux/stat.h>
19#include <linux/string.h>
20#include <linux/inet.h>
21#include <linux/namei.h>
22#include <linux/idr.h>
23#include <linux/sched.h>
24#include <linux/slab.h>
25#include <linux/xattr.h>
26#include <linux/posix_acl.h>
27#include <net/9p/9p.h>
28#include <net/9p/client.h>
29
30#include "v9fs.h"
31#include "v9fs_vfs.h"
32#include "fid.h"
33#include "cache.h"
34#include "xattr.h"
35#include "acl.h"
36
37static const struct inode_operations v9fs_dir_inode_operations;
38static const struct inode_operations v9fs_dir_inode_operations_dotu;
39static const struct inode_operations v9fs_file_inode_operations;
40static const struct inode_operations v9fs_symlink_inode_operations;
41
42/**
43 * unixmode2p9mode - convert unix mode bits to plan 9
44 * @v9ses: v9fs session information
45 * @mode: mode to convert
46 *
47 */
48
49static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode)
50{
51 int res;
52 res = mode & 0777;
53 if (S_ISDIR(mode))
54 res |= P9_DMDIR;
55 if (v9fs_proto_dotu(v9ses)) {
56 if (v9ses->nodev == 0) {
57 if (S_ISSOCK(mode))
58 res |= P9_DMSOCKET;
59 if (S_ISFIFO(mode))
60 res |= P9_DMNAMEDPIPE;
61 if (S_ISBLK(mode))
62 res |= P9_DMDEVICE;
63 if (S_ISCHR(mode))
64 res |= P9_DMDEVICE;
65 }
66
67 if ((mode & S_ISUID) == S_ISUID)
68 res |= P9_DMSETUID;
69 if ((mode & S_ISGID) == S_ISGID)
70 res |= P9_DMSETGID;
71 if ((mode & S_ISVTX) == S_ISVTX)
72 res |= P9_DMSETVTX;
73 }
74 return res;
75}
76
77/**
78 * p9mode2perm- convert plan9 mode bits to unix permission bits
79 * @v9ses: v9fs session information
80 * @stat: p9_wstat from which mode need to be derived
81 *
82 */
83static int p9mode2perm(struct v9fs_session_info *v9ses,
84 struct p9_wstat *stat)
85{
86 int res;
87 int mode = stat->mode;
88
89 res = mode & S_IALLUGO;
90 if (v9fs_proto_dotu(v9ses)) {
91 if ((mode & P9_DMSETUID) == P9_DMSETUID)
92 res |= S_ISUID;
93
94 if ((mode & P9_DMSETGID) == P9_DMSETGID)
95 res |= S_ISGID;
96
97 if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
98 res |= S_ISVTX;
99 }
100 return res;
101}
102
103/**
104 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
105 * @v9ses: v9fs session information
106 * @stat: p9_wstat from which mode need to be derived
107 * @rdev: major number, minor number in case of device files.
108 *
109 */
110static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses,
111 struct p9_wstat *stat, dev_t *rdev)
112{
113 int res;
114 u32 mode = stat->mode;
115
116 *rdev = 0;
117 res = p9mode2perm(v9ses, stat);
118
119 if ((mode & P9_DMDIR) == P9_DMDIR)
120 res |= S_IFDIR;
121 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
122 res |= S_IFLNK;
123 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
124 && (v9ses->nodev == 0))
125 res |= S_IFSOCK;
126 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
127 && (v9ses->nodev == 0))
128 res |= S_IFIFO;
129 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
130 && (v9ses->nodev == 0)) {
131 char type = 0, ext[32];
132 int major = -1, minor = -1;
133
134 strlcpy(ext, stat->extension, sizeof(ext));
135 sscanf(ext, "%c %i %i", &type, &major, &minor);
136 switch (type) {
137 case 'c':
138 res |= S_IFCHR;
139 break;
140 case 'b':
141 res |= S_IFBLK;
142 break;
143 default:
144 p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n",
145 type, stat->extension);
146 }
147 *rdev = MKDEV(major, minor);
148 } else
149 res |= S_IFREG;
150
151 return res;
152}
153
154/**
155 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
156 * @uflags: flags to convert
157 * @extended: if .u extensions are active
158 */
159
160int v9fs_uflags2omode(int uflags, int extended)
161{
162 int ret;
163
164 ret = 0;
165 switch (uflags&3) {
166 default:
167 case O_RDONLY:
168 ret = P9_OREAD;
169 break;
170
171 case O_WRONLY:
172 ret = P9_OWRITE;
173 break;
174
175 case O_RDWR:
176 ret = P9_ORDWR;
177 break;
178 }
179
180 if (extended) {
181 if (uflags & O_EXCL)
182 ret |= P9_OEXCL;
183
184 if (uflags & O_APPEND)
185 ret |= P9_OAPPEND;
186 }
187
188 return ret;
189}
190
191/**
192 * v9fs_blank_wstat - helper function to setup a 9P stat structure
193 * @wstat: structure to initialize
194 *
195 */
196
197void
198v9fs_blank_wstat(struct p9_wstat *wstat)
199{
200 wstat->type = ~0;
201 wstat->dev = ~0;
202 wstat->qid.type = ~0;
203 wstat->qid.version = ~0;
204 *((long long *)&wstat->qid.path) = ~0;
205 wstat->mode = ~0;
206 wstat->atime = ~0;
207 wstat->mtime = ~0;
208 wstat->length = ~0;
209 wstat->name = NULL;
210 wstat->uid = NULL;
211 wstat->gid = NULL;
212 wstat->muid = NULL;
213 wstat->n_uid = INVALID_UID;
214 wstat->n_gid = INVALID_GID;
215 wstat->n_muid = INVALID_UID;
216 wstat->extension = NULL;
217}
218
219/**
220 * v9fs_alloc_inode - helper function to allocate an inode
221 *
222 */
223struct inode *v9fs_alloc_inode(struct super_block *sb)
224{
225 struct v9fs_inode *v9inode;
226 v9inode = kmem_cache_alloc(v9fs_inode_cache, GFP_KERNEL);
227 if (!v9inode)
228 return NULL;
229#ifdef CONFIG_9P_FSCACHE
230 v9inode->fscache = NULL;
231 mutex_init(&v9inode->fscache_lock);
232#endif
233 v9inode->writeback_fid = NULL;
234 v9inode->cache_validity = 0;
235 mutex_init(&v9inode->v_mutex);
236 return &v9inode->vfs_inode;
237}
238
239/**
240 * v9fs_free_inode - destroy an inode
241 *
242 */
243
244void v9fs_free_inode(struct inode *inode)
245{
246 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
247}
248
249int v9fs_init_inode(struct v9fs_session_info *v9ses,
250 struct inode *inode, umode_t mode, dev_t rdev)
251{
252 int err = 0;
253
254 inode_init_owner(&init_user_ns,inode, NULL, mode);
255 inode->i_blocks = 0;
256 inode->i_rdev = rdev;
257 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
258 inode->i_mapping->a_ops = &v9fs_addr_operations;
259 inode->i_private = NULL;
260
261 switch (mode & S_IFMT) {
262 case S_IFIFO:
263 case S_IFBLK:
264 case S_IFCHR:
265 case S_IFSOCK:
266 if (v9fs_proto_dotl(v9ses)) {
267 inode->i_op = &v9fs_file_inode_operations_dotl;
268 } else if (v9fs_proto_dotu(v9ses)) {
269 inode->i_op = &v9fs_file_inode_operations;
270 } else {
271 p9_debug(P9_DEBUG_ERROR,
272 "special files without extended mode\n");
273 err = -EINVAL;
274 goto error;
275 }
276 init_special_inode(inode, inode->i_mode, inode->i_rdev);
277 break;
278 case S_IFREG:
279 if (v9fs_proto_dotl(v9ses)) {
280 inode->i_op = &v9fs_file_inode_operations_dotl;
281 if (v9ses->cache == CACHE_LOOSE ||
282 v9ses->cache == CACHE_FSCACHE)
283 inode->i_fop =
284 &v9fs_cached_file_operations_dotl;
285 else if (v9ses->cache == CACHE_MMAP)
286 inode->i_fop = &v9fs_mmap_file_operations_dotl;
287 else
288 inode->i_fop = &v9fs_file_operations_dotl;
289 } else {
290 inode->i_op = &v9fs_file_inode_operations;
291 if (v9ses->cache == CACHE_LOOSE ||
292 v9ses->cache == CACHE_FSCACHE)
293 inode->i_fop =
294 &v9fs_cached_file_operations;
295 else if (v9ses->cache == CACHE_MMAP)
296 inode->i_fop = &v9fs_mmap_file_operations;
297 else
298 inode->i_fop = &v9fs_file_operations;
299 }
300
301 break;
302 case S_IFLNK:
303 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
304 p9_debug(P9_DEBUG_ERROR,
305 "extended modes used with legacy protocol\n");
306 err = -EINVAL;
307 goto error;
308 }
309
310 if (v9fs_proto_dotl(v9ses))
311 inode->i_op = &v9fs_symlink_inode_operations_dotl;
312 else
313 inode->i_op = &v9fs_symlink_inode_operations;
314
315 break;
316 case S_IFDIR:
317 inc_nlink(inode);
318 if (v9fs_proto_dotl(v9ses))
319 inode->i_op = &v9fs_dir_inode_operations_dotl;
320 else if (v9fs_proto_dotu(v9ses))
321 inode->i_op = &v9fs_dir_inode_operations_dotu;
322 else
323 inode->i_op = &v9fs_dir_inode_operations;
324
325 if (v9fs_proto_dotl(v9ses))
326 inode->i_fop = &v9fs_dir_operations_dotl;
327 else
328 inode->i_fop = &v9fs_dir_operations;
329
330 break;
331 default:
332 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n",
333 mode, mode & S_IFMT);
334 err = -EINVAL;
335 goto error;
336 }
337error:
338 return err;
339
340}
341
342/**
343 * v9fs_get_inode - helper function to setup an inode
344 * @sb: superblock
345 * @mode: mode to setup inode with
346 *
347 */
348
349struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev)
350{
351 int err;
352 struct inode *inode;
353 struct v9fs_session_info *v9ses = sb->s_fs_info;
354
355 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode);
356
357 inode = new_inode(sb);
358 if (!inode) {
359 pr_warn("%s (%d): Problem allocating inode\n",
360 __func__, task_pid_nr(current));
361 return ERR_PTR(-ENOMEM);
362 }
363 err = v9fs_init_inode(v9ses, inode, mode, rdev);
364 if (err) {
365 iput(inode);
366 return ERR_PTR(err);
367 }
368 return inode;
369}
370
371/**
372 * v9fs_clear_inode - release an inode
373 * @inode: inode to release
374 *
375 */
376void v9fs_evict_inode(struct inode *inode)
377{
378 struct v9fs_inode *v9inode = V9FS_I(inode);
379
380 truncate_inode_pages_final(&inode->i_data);
381 clear_inode(inode);
382 filemap_fdatawrite(&inode->i_data);
383
384 v9fs_cache_inode_put_cookie(inode);
385 /* clunk the fid stashed in writeback_fid */
386 if (v9inode->writeback_fid) {
387 p9_client_clunk(v9inode->writeback_fid);
388 v9inode->writeback_fid = NULL;
389 }
390}
391
392static int v9fs_test_inode(struct inode *inode, void *data)
393{
394 int umode;
395 dev_t rdev;
396 struct v9fs_inode *v9inode = V9FS_I(inode);
397 struct p9_wstat *st = (struct p9_wstat *)data;
398 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
399
400 umode = p9mode2unixmode(v9ses, st, &rdev);
401 /* don't match inode of different type */
402 if (inode_wrong_type(inode, umode))
403 return 0;
404
405 /* compare qid details */
406 if (memcmp(&v9inode->qid.version,
407 &st->qid.version, sizeof(v9inode->qid.version)))
408 return 0;
409
410 if (v9inode->qid.type != st->qid.type)
411 return 0;
412
413 if (v9inode->qid.path != st->qid.path)
414 return 0;
415 return 1;
416}
417
418static int v9fs_test_new_inode(struct inode *inode, void *data)
419{
420 return 0;
421}
422
423static int v9fs_set_inode(struct inode *inode, void *data)
424{
425 struct v9fs_inode *v9inode = V9FS_I(inode);
426 struct p9_wstat *st = (struct p9_wstat *)data;
427
428 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
429 return 0;
430}
431
432static struct inode *v9fs_qid_iget(struct super_block *sb,
433 struct p9_qid *qid,
434 struct p9_wstat *st,
435 int new)
436{
437 dev_t rdev;
438 int retval;
439 umode_t umode;
440 unsigned long i_ino;
441 struct inode *inode;
442 struct v9fs_session_info *v9ses = sb->s_fs_info;
443 int (*test)(struct inode *, void *);
444
445 if (new)
446 test = v9fs_test_new_inode;
447 else
448 test = v9fs_test_inode;
449
450 i_ino = v9fs_qid2ino(qid);
451 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
452 if (!inode)
453 return ERR_PTR(-ENOMEM);
454 if (!(inode->i_state & I_NEW))
455 return inode;
456 /*
457 * initialize the inode with the stat info
458 * FIXME!! we may need support for stale inodes
459 * later.
460 */
461 inode->i_ino = i_ino;
462 umode = p9mode2unixmode(v9ses, st, &rdev);
463 retval = v9fs_init_inode(v9ses, inode, umode, rdev);
464 if (retval)
465 goto error;
466
467 v9fs_stat2inode(st, inode, sb, 0);
468 v9fs_cache_inode_get_cookie(inode);
469 unlock_new_inode(inode);
470 return inode;
471error:
472 iget_failed(inode);
473 return ERR_PTR(retval);
474
475}
476
477struct inode *
478v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
479 struct super_block *sb, int new)
480{
481 struct p9_wstat *st;
482 struct inode *inode = NULL;
483
484 st = p9_client_stat(fid);
485 if (IS_ERR(st))
486 return ERR_CAST(st);
487
488 inode = v9fs_qid_iget(sb, &st->qid, st, new);
489 p9stat_free(st);
490 kfree(st);
491 return inode;
492}
493
494/**
495 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
496 * plan 9 AT flag.
497 * @flags: flags to convert
498 */
499static int v9fs_at_to_dotl_flags(int flags)
500{
501 int rflags = 0;
502 if (flags & AT_REMOVEDIR)
503 rflags |= P9_DOTL_AT_REMOVEDIR;
504 return rflags;
505}
506
507/**
508 * v9fs_dec_count - helper functon to drop i_nlink.
509 *
510 * If a directory had nlink <= 2 (including . and ..), then we should not drop
511 * the link count, which indicates the underlying exported fs doesn't maintain
512 * nlink accurately. e.g.
513 * - overlayfs sets nlink to 1 for merged dir
514 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more
515 * than EXT4_LINK_MAX (65000) links.
516 *
517 * @inode: inode whose nlink is being dropped
518 */
519static void v9fs_dec_count(struct inode *inode)
520{
521 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2)
522 drop_nlink(inode);
523}
524
525/**
526 * v9fs_remove - helper function to remove files and directories
527 * @dir: directory inode that is being deleted
528 * @dentry: dentry that is being deleted
529 * @flags: removing a directory
530 *
531 */
532
533static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
534{
535 struct inode *inode;
536 int retval = -EOPNOTSUPP;
537 struct p9_fid *v9fid, *dfid;
538 struct v9fs_session_info *v9ses;
539
540 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
541 dir, dentry, flags);
542
543 v9ses = v9fs_inode2v9ses(dir);
544 inode = d_inode(dentry);
545 dfid = v9fs_parent_fid(dentry);
546 if (IS_ERR(dfid)) {
547 retval = PTR_ERR(dfid);
548 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
549 return retval;
550 }
551 if (v9fs_proto_dotl(v9ses))
552 retval = p9_client_unlinkat(dfid, dentry->d_name.name,
553 v9fs_at_to_dotl_flags(flags));
554 p9_client_clunk(dfid);
555 if (retval == -EOPNOTSUPP) {
556 /* Try the one based on path */
557 v9fid = v9fs_fid_clone(dentry);
558 if (IS_ERR(v9fid))
559 return PTR_ERR(v9fid);
560 retval = p9_client_remove(v9fid);
561 }
562 if (!retval) {
563 /*
564 * directories on unlink should have zero
565 * link count
566 */
567 if (flags & AT_REMOVEDIR) {
568 clear_nlink(inode);
569 v9fs_dec_count(dir);
570 } else
571 v9fs_dec_count(inode);
572
573 v9fs_invalidate_inode_attr(inode);
574 v9fs_invalidate_inode_attr(dir);
575
576 /* invalidate all fids associated with dentry */
577 /* NOTE: This will not include open fids */
578 dentry->d_op->d_release(dentry);
579 }
580 return retval;
581}
582
583/**
584 * v9fs_create - Create a file
585 * @v9ses: session information
586 * @dir: directory that dentry is being created in
587 * @dentry: dentry that is being created
588 * @extension: 9p2000.u extension string to support devices, etc.
589 * @perm: create permissions
590 * @mode: open mode
591 *
592 */
593static struct p9_fid *
594v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
595 struct dentry *dentry, char *extension, u32 perm, u8 mode)
596{
597 int err;
598 const unsigned char *name;
599 struct p9_fid *dfid, *ofid = NULL, *fid = NULL;
600 struct inode *inode;
601
602 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
603
604 err = 0;
605 name = dentry->d_name.name;
606 dfid = v9fs_parent_fid(dentry);
607 if (IS_ERR(dfid)) {
608 err = PTR_ERR(dfid);
609 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
610 return ERR_PTR(err);
611 }
612
613 /* clone a fid to use for creation */
614 ofid = clone_fid(dfid);
615 if (IS_ERR(ofid)) {
616 err = PTR_ERR(ofid);
617 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
618 p9_client_clunk(dfid);
619 return ERR_PTR(err);
620 }
621
622 err = p9_client_fcreate(ofid, name, perm, mode, extension);
623 if (err < 0) {
624 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
625 p9_client_clunk(dfid);
626 goto error;
627 }
628
629 if (!(perm & P9_DMLINK)) {
630 /* now walk from the parent so we can get unopened fid */
631 fid = p9_client_walk(dfid, 1, &name, 1);
632 if (IS_ERR(fid)) {
633 err = PTR_ERR(fid);
634 p9_debug(P9_DEBUG_VFS,
635 "p9_client_walk failed %d\n", err);
636 fid = NULL;
637 p9_client_clunk(dfid);
638 goto error;
639 }
640 /*
641 * instantiate inode and assign the unopened fid to the dentry
642 */
643 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
644 if (IS_ERR(inode)) {
645 err = PTR_ERR(inode);
646 p9_debug(P9_DEBUG_VFS,
647 "inode creation failed %d\n", err);
648 p9_client_clunk(dfid);
649 goto error;
650 }
651 v9fs_fid_add(dentry, fid);
652 d_instantiate(dentry, inode);
653 }
654 p9_client_clunk(dfid);
655 return ofid;
656error:
657 if (ofid)
658 p9_client_clunk(ofid);
659
660 if (fid)
661 p9_client_clunk(fid);
662
663 return ERR_PTR(err);
664}
665
666/**
667 * v9fs_vfs_create - VFS hook to create a regular file
668 *
669 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called
670 * for mknod(2).
671 *
672 * @dir: directory inode that is being created
673 * @dentry: dentry that is being deleted
674 * @mode: create permissions
675 *
676 */
677
678static int
679v9fs_vfs_create(struct user_namespace *mnt_userns, struct inode *dir,
680 struct dentry *dentry, umode_t mode, bool excl)
681{
682 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
683 u32 perm = unixmode2p9mode(v9ses, mode);
684 struct p9_fid *fid;
685
686 /* P9_OEXCL? */
687 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR);
688 if (IS_ERR(fid))
689 return PTR_ERR(fid);
690
691 v9fs_invalidate_inode_attr(dir);
692 p9_client_clunk(fid);
693
694 return 0;
695}
696
697/**
698 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
699 * @dir: inode that is being unlinked
700 * @dentry: dentry that is being unlinked
701 * @mode: mode for new directory
702 *
703 */
704
705static int v9fs_vfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
706 struct dentry *dentry, umode_t mode)
707{
708 int err;
709 u32 perm;
710 struct p9_fid *fid;
711 struct v9fs_session_info *v9ses;
712
713 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
714 err = 0;
715 v9ses = v9fs_inode2v9ses(dir);
716 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
717 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
718 if (IS_ERR(fid)) {
719 err = PTR_ERR(fid);
720 fid = NULL;
721 } else {
722 inc_nlink(dir);
723 v9fs_invalidate_inode_attr(dir);
724 }
725
726 if (fid)
727 p9_client_clunk(fid);
728
729 return err;
730}
731
732/**
733 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
734 * @dir: inode that is being walked from
735 * @dentry: dentry that is being walked to?
736 * @flags: lookup flags (unused)
737 *
738 */
739
740struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
741 unsigned int flags)
742{
743 struct dentry *res;
744 struct v9fs_session_info *v9ses;
745 struct p9_fid *dfid, *fid;
746 struct inode *inode;
747 const unsigned char *name;
748
749 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n",
750 dir, dentry, dentry, flags);
751
752 if (dentry->d_name.len > NAME_MAX)
753 return ERR_PTR(-ENAMETOOLONG);
754
755 v9ses = v9fs_inode2v9ses(dir);
756 /* We can walk d_parent because we hold the dir->i_mutex */
757 dfid = v9fs_parent_fid(dentry);
758 if (IS_ERR(dfid))
759 return ERR_CAST(dfid);
760
761 /*
762 * Make sure we don't use a wrong inode due to parallel
763 * unlink. For cached mode create calls request for new
764 * inode. But with cache disabled, lookup should do this.
765 */
766 name = dentry->d_name.name;
767 fid = p9_client_walk(dfid, 1, &name, 1);
768 p9_client_clunk(dfid);
769 if (fid == ERR_PTR(-ENOENT))
770 inode = NULL;
771 else if (IS_ERR(fid))
772 inode = ERR_CAST(fid);
773 else if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
774 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
775 else
776 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
777 /*
778 * If we had a rename on the server and a parallel lookup
779 * for the new name, then make sure we instantiate with
780 * the new name. ie look up for a/b, while on server somebody
781 * moved b under k and client parallely did a lookup for
782 * k/b.
783 */
784 res = d_splice_alias(inode, dentry);
785 if (!IS_ERR(fid)) {
786 if (!res)
787 v9fs_fid_add(dentry, fid);
788 else if (!IS_ERR(res))
789 v9fs_fid_add(res, fid);
790 else
791 p9_client_clunk(fid);
792 }
793 return res;
794}
795
796static int
797v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
798 struct file *file, unsigned flags, umode_t mode)
799{
800 int err;
801 u32 perm;
802 struct v9fs_inode *v9inode;
803 struct v9fs_session_info *v9ses;
804 struct p9_fid *fid, *inode_fid;
805 struct dentry *res = NULL;
806 struct inode *inode;
807
808 if (d_in_lookup(dentry)) {
809 res = v9fs_vfs_lookup(dir, dentry, 0);
810 if (IS_ERR(res))
811 return PTR_ERR(res);
812
813 if (res)
814 dentry = res;
815 }
816
817 /* Only creates */
818 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
819 return finish_no_open(file, res);
820
821 err = 0;
822
823 v9ses = v9fs_inode2v9ses(dir);
824 perm = unixmode2p9mode(v9ses, mode);
825 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
826 v9fs_uflags2omode(flags,
827 v9fs_proto_dotu(v9ses)));
828 if (IS_ERR(fid)) {
829 err = PTR_ERR(fid);
830 fid = NULL;
831 goto error;
832 }
833
834 v9fs_invalidate_inode_attr(dir);
835 inode = d_inode(dentry);
836 v9inode = V9FS_I(inode);
837 mutex_lock(&v9inode->v_mutex);
838 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
839 !v9inode->writeback_fid &&
840 ((flags & O_ACCMODE) != O_RDONLY)) {
841 /*
842 * clone a fid and add it to writeback_fid
843 * we do it during open time instead of
844 * page dirty time via write_begin/page_mkwrite
845 * because we want write after unlink usecase
846 * to work.
847 */
848 inode_fid = v9fs_writeback_fid(dentry);
849 if (IS_ERR(inode_fid)) {
850 err = PTR_ERR(inode_fid);
851 mutex_unlock(&v9inode->v_mutex);
852 goto error;
853 }
854 v9inode->writeback_fid = (void *) inode_fid;
855 }
856 mutex_unlock(&v9inode->v_mutex);
857 err = finish_open(file, dentry, generic_file_open);
858 if (err)
859 goto error;
860
861 file->private_data = fid;
862 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
863 v9fs_cache_inode_set_cookie(d_inode(dentry), file);
864 v9fs_open_fid_add(inode, fid);
865
866 file->f_mode |= FMODE_CREATED;
867out:
868 dput(res);
869 return err;
870
871error:
872 if (fid)
873 p9_client_clunk(fid);
874 goto out;
875}
876
877/**
878 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
879 * @i: inode that is being unlinked
880 * @d: dentry that is being unlinked
881 *
882 */
883
884int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
885{
886 return v9fs_remove(i, d, 0);
887}
888
889/**
890 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
891 * @i: inode that is being unlinked
892 * @d: dentry that is being unlinked
893 *
894 */
895
896int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
897{
898 return v9fs_remove(i, d, AT_REMOVEDIR);
899}
900
901/**
902 * v9fs_vfs_rename - VFS hook to rename an inode
903 * @old_dir: old dir inode
904 * @old_dentry: old dentry
905 * @new_dir: new dir inode
906 * @new_dentry: new dentry
907 *
908 */
909
910int
911v9fs_vfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
912 struct dentry *old_dentry, struct inode *new_dir,
913 struct dentry *new_dentry, unsigned int flags)
914{
915 int retval;
916 struct inode *old_inode;
917 struct inode *new_inode;
918 struct v9fs_session_info *v9ses;
919 struct p9_fid *oldfid, *dfid;
920 struct p9_fid *olddirfid;
921 struct p9_fid *newdirfid;
922 struct p9_wstat wstat;
923
924 if (flags)
925 return -EINVAL;
926
927 p9_debug(P9_DEBUG_VFS, "\n");
928 retval = 0;
929 old_inode = d_inode(old_dentry);
930 new_inode = d_inode(new_dentry);
931 v9ses = v9fs_inode2v9ses(old_inode);
932 oldfid = v9fs_fid_lookup(old_dentry);
933 if (IS_ERR(oldfid))
934 return PTR_ERR(oldfid);
935
936 dfid = v9fs_parent_fid(old_dentry);
937 olddirfid = clone_fid(dfid);
938 if (dfid && !IS_ERR(dfid))
939 p9_client_clunk(dfid);
940
941 if (IS_ERR(olddirfid)) {
942 retval = PTR_ERR(olddirfid);
943 goto done;
944 }
945
946 dfid = v9fs_parent_fid(new_dentry);
947 newdirfid = clone_fid(dfid);
948 p9_client_clunk(dfid);
949
950 if (IS_ERR(newdirfid)) {
951 retval = PTR_ERR(newdirfid);
952 goto clunk_olddir;
953 }
954
955 down_write(&v9ses->rename_sem);
956 if (v9fs_proto_dotl(v9ses)) {
957 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
958 newdirfid, new_dentry->d_name.name);
959 if (retval == -EOPNOTSUPP)
960 retval = p9_client_rename(oldfid, newdirfid,
961 new_dentry->d_name.name);
962 if (retval != -EOPNOTSUPP)
963 goto clunk_newdir;
964 }
965 if (old_dentry->d_parent != new_dentry->d_parent) {
966 /*
967 * 9P .u can only handle file rename in the same directory
968 */
969
970 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
971 retval = -EXDEV;
972 goto clunk_newdir;
973 }
974 v9fs_blank_wstat(&wstat);
975 wstat.muid = v9ses->uname;
976 wstat.name = new_dentry->d_name.name;
977 retval = p9_client_wstat(oldfid, &wstat);
978
979clunk_newdir:
980 if (!retval) {
981 if (new_inode) {
982 if (S_ISDIR(new_inode->i_mode))
983 clear_nlink(new_inode);
984 else
985 v9fs_dec_count(new_inode);
986 }
987 if (S_ISDIR(old_inode->i_mode)) {
988 if (!new_inode)
989 inc_nlink(new_dir);
990 v9fs_dec_count(old_dir);
991 }
992 v9fs_invalidate_inode_attr(old_inode);
993 v9fs_invalidate_inode_attr(old_dir);
994 v9fs_invalidate_inode_attr(new_dir);
995
996 /* successful rename */
997 d_move(old_dentry, new_dentry);
998 }
999 up_write(&v9ses->rename_sem);
1000 p9_client_clunk(newdirfid);
1001
1002clunk_olddir:
1003 p9_client_clunk(olddirfid);
1004
1005done:
1006 p9_client_clunk(oldfid);
1007 return retval;
1008}
1009
1010/**
1011 * v9fs_vfs_getattr - retrieve file metadata
1012 * @path: Object to query
1013 * @stat: metadata structure to populate
1014 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
1015 * @flags: AT_STATX_xxx setting
1016 *
1017 */
1018
1019static int
1020v9fs_vfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
1021 struct kstat *stat, u32 request_mask, unsigned int flags)
1022{
1023 struct dentry *dentry = path->dentry;
1024 struct v9fs_session_info *v9ses;
1025 struct p9_fid *fid;
1026 struct p9_wstat *st;
1027
1028 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1029 v9ses = v9fs_dentry2v9ses(dentry);
1030 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1031 generic_fillattr(&init_user_ns, d_inode(dentry), stat);
1032 return 0;
1033 }
1034 fid = v9fs_fid_lookup(dentry);
1035 if (IS_ERR(fid))
1036 return PTR_ERR(fid);
1037
1038 st = p9_client_stat(fid);
1039 p9_client_clunk(fid);
1040 if (IS_ERR(st))
1041 return PTR_ERR(st);
1042
1043 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0);
1044 generic_fillattr(&init_user_ns, d_inode(dentry), stat);
1045
1046 p9stat_free(st);
1047 kfree(st);
1048 return 0;
1049}
1050
1051/**
1052 * v9fs_vfs_setattr - set file metadata
1053 * @dentry: file whose metadata to set
1054 * @iattr: metadata assignment structure
1055 *
1056 */
1057
1058static int v9fs_vfs_setattr(struct user_namespace *mnt_userns,
1059 struct dentry *dentry, struct iattr *iattr)
1060{
1061 int retval, use_dentry = 0;
1062 struct v9fs_session_info *v9ses;
1063 struct p9_fid *fid = NULL;
1064 struct p9_wstat wstat;
1065
1066 p9_debug(P9_DEBUG_VFS, "\n");
1067 retval = setattr_prepare(&init_user_ns, dentry, iattr);
1068 if (retval)
1069 return retval;
1070
1071 retval = -EPERM;
1072 v9ses = v9fs_dentry2v9ses(dentry);
1073 if (iattr->ia_valid & ATTR_FILE) {
1074 fid = iattr->ia_file->private_data;
1075 WARN_ON(!fid);
1076 }
1077 if (!fid) {
1078 fid = v9fs_fid_lookup(dentry);
1079 use_dentry = 1;
1080 }
1081 if(IS_ERR(fid))
1082 return PTR_ERR(fid);
1083
1084 v9fs_blank_wstat(&wstat);
1085 if (iattr->ia_valid & ATTR_MODE)
1086 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1087
1088 if (iattr->ia_valid & ATTR_MTIME)
1089 wstat.mtime = iattr->ia_mtime.tv_sec;
1090
1091 if (iattr->ia_valid & ATTR_ATIME)
1092 wstat.atime = iattr->ia_atime.tv_sec;
1093
1094 if (iattr->ia_valid & ATTR_SIZE)
1095 wstat.length = iattr->ia_size;
1096
1097 if (v9fs_proto_dotu(v9ses)) {
1098 if (iattr->ia_valid & ATTR_UID)
1099 wstat.n_uid = iattr->ia_uid;
1100
1101 if (iattr->ia_valid & ATTR_GID)
1102 wstat.n_gid = iattr->ia_gid;
1103 }
1104
1105 /* Write all dirty data */
1106 if (d_is_reg(dentry))
1107 filemap_write_and_wait(d_inode(dentry)->i_mapping);
1108
1109 retval = p9_client_wstat(fid, &wstat);
1110
1111 if (use_dentry)
1112 p9_client_clunk(fid);
1113
1114 if (retval < 0)
1115 return retval;
1116
1117 if ((iattr->ia_valid & ATTR_SIZE) &&
1118 iattr->ia_size != i_size_read(d_inode(dentry)))
1119 truncate_setsize(d_inode(dentry), iattr->ia_size);
1120
1121 v9fs_invalidate_inode_attr(d_inode(dentry));
1122
1123 setattr_copy(&init_user_ns, d_inode(dentry), iattr);
1124 mark_inode_dirty(d_inode(dentry));
1125 return 0;
1126}
1127
1128/**
1129 * v9fs_stat2inode - populate an inode structure with mistat info
1130 * @stat: Plan 9 metadata (mistat) structure
1131 * @inode: inode to populate
1132 * @sb: superblock of filesystem
1133 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
1134 *
1135 */
1136
1137void
1138v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1139 struct super_block *sb, unsigned int flags)
1140{
1141 umode_t mode;
1142 struct v9fs_session_info *v9ses = sb->s_fs_info;
1143 struct v9fs_inode *v9inode = V9FS_I(inode);
1144
1145 set_nlink(inode, 1);
1146
1147 inode->i_atime.tv_sec = stat->atime;
1148 inode->i_mtime.tv_sec = stat->mtime;
1149 inode->i_ctime.tv_sec = stat->mtime;
1150
1151 inode->i_uid = v9ses->dfltuid;
1152 inode->i_gid = v9ses->dfltgid;
1153
1154 if (v9fs_proto_dotu(v9ses)) {
1155 inode->i_uid = stat->n_uid;
1156 inode->i_gid = stat->n_gid;
1157 }
1158 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1159 if (v9fs_proto_dotu(v9ses)) {
1160 unsigned int i_nlink;
1161 /*
1162 * Hadlink support got added later to the .u extension.
1163 * So there can be a server out there that doesn't
1164 * support this even with .u extension. That would
1165 * just leave us with stat->extension being an empty
1166 * string, though.
1167 */
1168 /* HARDLINKCOUNT %u */
1169 if (sscanf(stat->extension,
1170 " HARDLINKCOUNT %u", &i_nlink) == 1)
1171 set_nlink(inode, i_nlink);
1172 }
1173 }
1174 mode = p9mode2perm(v9ses, stat);
1175 mode |= inode->i_mode & ~S_IALLUGO;
1176 inode->i_mode = mode;
1177
1178 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
1179 v9fs_i_size_write(inode, stat->length);
1180 /* not real number of blocks, but 512 byte ones ... */
1181 inode->i_blocks = (stat->length + 512 - 1) >> 9;
1182 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1183}
1184
1185/**
1186 * v9fs_qid2ino - convert qid into inode number
1187 * @qid: qid to hash
1188 *
1189 * BUG: potential for inode number collisions?
1190 */
1191
1192ino_t v9fs_qid2ino(struct p9_qid *qid)
1193{
1194 u64 path = qid->path + 2;
1195 ino_t i = 0;
1196
1197 if (sizeof(ino_t) == sizeof(path))
1198 memcpy(&i, &path, sizeof(ino_t));
1199 else
1200 i = (ino_t) (path ^ (path >> 32));
1201
1202 return i;
1203}
1204
1205/**
1206 * v9fs_vfs_get_link - follow a symlink path
1207 * @dentry: dentry for symlink
1208 * @inode: inode for symlink
1209 * @done: delayed call for when we are done with the return value
1210 */
1211
1212static const char *v9fs_vfs_get_link(struct dentry *dentry,
1213 struct inode *inode,
1214 struct delayed_call *done)
1215{
1216 struct v9fs_session_info *v9ses;
1217 struct p9_fid *fid;
1218 struct p9_wstat *st;
1219 char *res;
1220
1221 if (!dentry)
1222 return ERR_PTR(-ECHILD);
1223
1224 v9ses = v9fs_dentry2v9ses(dentry);
1225 fid = v9fs_fid_lookup(dentry);
1226 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
1227
1228 if (IS_ERR(fid))
1229 return ERR_CAST(fid);
1230
1231 if (!v9fs_proto_dotu(v9ses))
1232 return ERR_PTR(-EBADF);
1233
1234 st = p9_client_stat(fid);
1235 p9_client_clunk(fid);
1236 if (IS_ERR(st))
1237 return ERR_CAST(st);
1238
1239 if (!(st->mode & P9_DMSYMLINK)) {
1240 p9stat_free(st);
1241 kfree(st);
1242 return ERR_PTR(-EINVAL);
1243 }
1244 res = st->extension;
1245 st->extension = NULL;
1246 if (strlen(res) >= PATH_MAX)
1247 res[PATH_MAX - 1] = '\0';
1248
1249 p9stat_free(st);
1250 kfree(st);
1251 set_delayed_call(done, kfree_link, res);
1252 return res;
1253}
1254
1255/**
1256 * v9fs_vfs_mkspecial - create a special file
1257 * @dir: inode to create special file in
1258 * @dentry: dentry to create
1259 * @perm: mode to create special file
1260 * @extension: 9p2000.u format extension string representing special file
1261 *
1262 */
1263
1264static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1265 u32 perm, const char *extension)
1266{
1267 struct p9_fid *fid;
1268 struct v9fs_session_info *v9ses;
1269
1270 v9ses = v9fs_inode2v9ses(dir);
1271 if (!v9fs_proto_dotu(v9ses)) {
1272 p9_debug(P9_DEBUG_ERROR, "not extended\n");
1273 return -EPERM;
1274 }
1275
1276 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1277 P9_OREAD);
1278 if (IS_ERR(fid))
1279 return PTR_ERR(fid);
1280
1281 v9fs_invalidate_inode_attr(dir);
1282 p9_client_clunk(fid);
1283 return 0;
1284}
1285
1286/**
1287 * v9fs_vfs_symlink - helper function to create symlinks
1288 * @dir: directory inode containing symlink
1289 * @dentry: dentry for symlink
1290 * @symname: symlink data
1291 *
1292 * See Also: 9P2000.u RFC for more information
1293 *
1294 */
1295
1296static int
1297v9fs_vfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
1298 struct dentry *dentry, const char *symname)
1299{
1300 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n",
1301 dir->i_ino, dentry, symname);
1302
1303 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname);
1304}
1305
1306#define U32_MAX_DIGITS 10
1307
1308/**
1309 * v9fs_vfs_link - create a hardlink
1310 * @old_dentry: dentry for file to link to
1311 * @dir: inode destination for new link
1312 * @dentry: dentry for link
1313 *
1314 */
1315
1316static int
1317v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1318 struct dentry *dentry)
1319{
1320 int retval;
1321 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */
1322 struct p9_fid *oldfid;
1323
1324 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n",
1325 dir->i_ino, dentry, old_dentry);
1326
1327 oldfid = v9fs_fid_clone(old_dentry);
1328 if (IS_ERR(oldfid))
1329 return PTR_ERR(oldfid);
1330
1331 sprintf(name, "%d\n", oldfid->fid);
1332 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1333 if (!retval) {
1334 v9fs_refresh_inode(oldfid, d_inode(old_dentry));
1335 v9fs_invalidate_inode_attr(dir);
1336 }
1337 p9_client_clunk(oldfid);
1338 return retval;
1339}
1340
1341/**
1342 * v9fs_vfs_mknod - create a special file
1343 * @dir: inode destination for new link
1344 * @dentry: dentry for file
1345 * @mode: mode for creation
1346 * @rdev: device associated with special file
1347 *
1348 */
1349
1350static int
1351v9fs_vfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
1352 struct dentry *dentry, umode_t mode, dev_t rdev)
1353{
1354 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1355 int retval;
1356 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1];
1357 u32 perm;
1358
1359 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
1360 dir->i_ino, dentry, mode,
1361 MAJOR(rdev), MINOR(rdev));
1362
1363 /* build extension */
1364 if (S_ISBLK(mode))
1365 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1366 else if (S_ISCHR(mode))
1367 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1368 else
1369 *name = 0;
1370
1371 perm = unixmode2p9mode(v9ses, mode);
1372 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name);
1373
1374 return retval;
1375}
1376
1377int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1378{
1379 int umode;
1380 dev_t rdev;
1381 struct p9_wstat *st;
1382 struct v9fs_session_info *v9ses;
1383 unsigned int flags;
1384
1385 v9ses = v9fs_inode2v9ses(inode);
1386 st = p9_client_stat(fid);
1387 if (IS_ERR(st))
1388 return PTR_ERR(st);
1389 /*
1390 * Don't update inode if the file type is different
1391 */
1392 umode = p9mode2unixmode(v9ses, st, &rdev);
1393 if (inode_wrong_type(inode, umode))
1394 goto out;
1395
1396 /*
1397 * We don't want to refresh inode->i_size,
1398 * because we may have cached data
1399 */
1400 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
1401 V9FS_STAT2INODE_KEEP_ISIZE : 0;
1402 v9fs_stat2inode(st, inode, inode->i_sb, flags);
1403out:
1404 p9stat_free(st);
1405 kfree(st);
1406 return 0;
1407}
1408
1409static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1410 .create = v9fs_vfs_create,
1411 .lookup = v9fs_vfs_lookup,
1412 .atomic_open = v9fs_vfs_atomic_open,
1413 .symlink = v9fs_vfs_symlink,
1414 .link = v9fs_vfs_link,
1415 .unlink = v9fs_vfs_unlink,
1416 .mkdir = v9fs_vfs_mkdir,
1417 .rmdir = v9fs_vfs_rmdir,
1418 .mknod = v9fs_vfs_mknod,
1419 .rename = v9fs_vfs_rename,
1420 .getattr = v9fs_vfs_getattr,
1421 .setattr = v9fs_vfs_setattr,
1422};
1423
1424static const struct inode_operations v9fs_dir_inode_operations = {
1425 .create = v9fs_vfs_create,
1426 .lookup = v9fs_vfs_lookup,
1427 .atomic_open = v9fs_vfs_atomic_open,
1428 .unlink = v9fs_vfs_unlink,
1429 .mkdir = v9fs_vfs_mkdir,
1430 .rmdir = v9fs_vfs_rmdir,
1431 .mknod = v9fs_vfs_mknod,
1432 .rename = v9fs_vfs_rename,
1433 .getattr = v9fs_vfs_getattr,
1434 .setattr = v9fs_vfs_setattr,
1435};
1436
1437static const struct inode_operations v9fs_file_inode_operations = {
1438 .getattr = v9fs_vfs_getattr,
1439 .setattr = v9fs_vfs_setattr,
1440};
1441
1442static const struct inode_operations v9fs_symlink_inode_operations = {
1443 .get_link = v9fs_vfs_get_link,
1444 .getattr = v9fs_vfs_getattr,
1445 .setattr = v9fs_vfs_setattr,
1446};
1447
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