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
37 static const struct inode_operations v9fs_dir_inode_operations;
38 static const struct inode_operations v9fs_dir_inode_operations_dotu;
39 static const struct inode_operations v9fs_file_inode_operations;
40 static 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
unixmode2p9mode(struct v9fs_session_info * v9ses,umode_t mode)49 static 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 */
p9mode2perm(struct v9fs_session_info * v9ses,struct p9_wstat * stat)83 static 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 */
p9mode2unixmode(struct v9fs_session_info * v9ses,struct p9_wstat * stat,dev_t * rdev)110 static 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
v9fs_uflags2omode(int uflags,int extended)160 int 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
197 void
v9fs_blank_wstat(struct p9_wstat * wstat)198 v9fs_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 */
v9fs_alloc_inode(struct super_block * sb)223 struct 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
v9fs_free_inode(struct inode * inode)244 void v9fs_free_inode(struct inode *inode)
245 {
246 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
247 }
248
v9fs_init_inode(struct v9fs_session_info * v9ses,struct inode * inode,umode_t mode,dev_t rdev)249 int 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(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
260 switch (mode & S_IFMT) {
261 case S_IFIFO:
262 case S_IFBLK:
263 case S_IFCHR:
264 case S_IFSOCK:
265 if (v9fs_proto_dotl(v9ses)) {
266 inode->i_op = &v9fs_file_inode_operations_dotl;
267 } else if (v9fs_proto_dotu(v9ses)) {
268 inode->i_op = &v9fs_file_inode_operations;
269 } else {
270 p9_debug(P9_DEBUG_ERROR,
271 "special files without extended mode\n");
272 err = -EINVAL;
273 goto error;
274 }
275 init_special_inode(inode, inode->i_mode, inode->i_rdev);
276 break;
277 case S_IFREG:
278 if (v9fs_proto_dotl(v9ses)) {
279 inode->i_op = &v9fs_file_inode_operations_dotl;
280 if (v9ses->cache == CACHE_LOOSE ||
281 v9ses->cache == CACHE_FSCACHE)
282 inode->i_fop =
283 &v9fs_cached_file_operations_dotl;
284 else if (v9ses->cache == CACHE_MMAP)
285 inode->i_fop = &v9fs_mmap_file_operations_dotl;
286 else
287 inode->i_fop = &v9fs_file_operations_dotl;
288 } else {
289 inode->i_op = &v9fs_file_inode_operations;
290 if (v9ses->cache == CACHE_LOOSE ||
291 v9ses->cache == CACHE_FSCACHE)
292 inode->i_fop =
293 &v9fs_cached_file_operations;
294 else if (v9ses->cache == CACHE_MMAP)
295 inode->i_fop = &v9fs_mmap_file_operations;
296 else
297 inode->i_fop = &v9fs_file_operations;
298 }
299
300 break;
301 case S_IFLNK:
302 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
303 p9_debug(P9_DEBUG_ERROR,
304 "extended modes used with legacy protocol\n");
305 err = -EINVAL;
306 goto error;
307 }
308
309 if (v9fs_proto_dotl(v9ses))
310 inode->i_op = &v9fs_symlink_inode_operations_dotl;
311 else
312 inode->i_op = &v9fs_symlink_inode_operations;
313
314 break;
315 case S_IFDIR:
316 inc_nlink(inode);
317 if (v9fs_proto_dotl(v9ses))
318 inode->i_op = &v9fs_dir_inode_operations_dotl;
319 else if (v9fs_proto_dotu(v9ses))
320 inode->i_op = &v9fs_dir_inode_operations_dotu;
321 else
322 inode->i_op = &v9fs_dir_inode_operations;
323
324 if (v9fs_proto_dotl(v9ses))
325 inode->i_fop = &v9fs_dir_operations_dotl;
326 else
327 inode->i_fop = &v9fs_dir_operations;
328
329 break;
330 default:
331 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n",
332 mode, mode & S_IFMT);
333 err = -EINVAL;
334 goto error;
335 }
336 error:
337 return err;
338
339 }
340
341 /**
342 * v9fs_get_inode - helper function to setup an inode
343 * @sb: superblock
344 * @mode: mode to setup inode with
345 *
346 */
347
v9fs_get_inode(struct super_block * sb,umode_t mode,dev_t rdev)348 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev)
349 {
350 int err;
351 struct inode *inode;
352 struct v9fs_session_info *v9ses = sb->s_fs_info;
353
354 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode);
355
356 inode = new_inode(sb);
357 if (!inode) {
358 pr_warn("%s (%d): Problem allocating inode\n",
359 __func__, task_pid_nr(current));
360 return ERR_PTR(-ENOMEM);
361 }
362 err = v9fs_init_inode(v9ses, inode, mode, rdev);
363 if (err) {
364 iput(inode);
365 return ERR_PTR(err);
366 }
367 return inode;
368 }
369
370 /**
371 * v9fs_clear_inode - release an inode
372 * @inode: inode to release
373 *
374 */
v9fs_evict_inode(struct inode * inode)375 void v9fs_evict_inode(struct inode *inode)
376 {
377 struct v9fs_inode *v9inode = V9FS_I(inode);
378
379 truncate_inode_pages_final(&inode->i_data);
380 clear_inode(inode);
381 filemap_fdatawrite(&inode->i_data);
382
383 v9fs_cache_inode_put_cookie(inode);
384 /* clunk the fid stashed in writeback_fid */
385 if (v9inode->writeback_fid) {
386 p9_client_clunk(v9inode->writeback_fid);
387 v9inode->writeback_fid = NULL;
388 }
389 }
390
v9fs_test_inode(struct inode * inode,void * data)391 static int v9fs_test_inode(struct inode *inode, void *data)
392 {
393 int umode;
394 dev_t rdev;
395 struct v9fs_inode *v9inode = V9FS_I(inode);
396 struct p9_wstat *st = (struct p9_wstat *)data;
397 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
398
399 umode = p9mode2unixmode(v9ses, st, &rdev);
400 /* don't match inode of different type */
401 if (inode_wrong_type(inode, umode))
402 return 0;
403
404 /* compare qid details */
405 if (memcmp(&v9inode->qid.version,
406 &st->qid.version, sizeof(v9inode->qid.version)))
407 return 0;
408
409 if (v9inode->qid.type != st->qid.type)
410 return 0;
411
412 if (v9inode->qid.path != st->qid.path)
413 return 0;
414 return 1;
415 }
416
v9fs_test_new_inode(struct inode * inode,void * data)417 static int v9fs_test_new_inode(struct inode *inode, void *data)
418 {
419 return 0;
420 }
421
v9fs_set_inode(struct inode * inode,void * data)422 static int v9fs_set_inode(struct inode *inode, void *data)
423 {
424 struct v9fs_inode *v9inode = V9FS_I(inode);
425 struct p9_wstat *st = (struct p9_wstat *)data;
426
427 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
428 return 0;
429 }
430
v9fs_qid_iget(struct super_block * sb,struct p9_qid * qid,struct p9_wstat * st,int new)431 static struct inode *v9fs_qid_iget(struct super_block *sb,
432 struct p9_qid *qid,
433 struct p9_wstat *st,
434 int new)
435 {
436 dev_t rdev;
437 int retval;
438 umode_t umode;
439 unsigned long i_ino;
440 struct inode *inode;
441 struct v9fs_session_info *v9ses = sb->s_fs_info;
442 int (*test)(struct inode *, void *);
443
444 if (new)
445 test = v9fs_test_new_inode;
446 else
447 test = v9fs_test_inode;
448
449 i_ino = v9fs_qid2ino(qid);
450 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
451 if (!inode)
452 return ERR_PTR(-ENOMEM);
453 if (!(inode->i_state & I_NEW))
454 return inode;
455 /*
456 * initialize the inode with the stat info
457 * FIXME!! we may need support for stale inodes
458 * later.
459 */
460 inode->i_ino = i_ino;
461 umode = p9mode2unixmode(v9ses, st, &rdev);
462 retval = v9fs_init_inode(v9ses, inode, umode, rdev);
463 if (retval)
464 goto error;
465
466 v9fs_stat2inode(st, inode, sb, 0);
467 v9fs_cache_inode_get_cookie(inode);
468 unlock_new_inode(inode);
469 return inode;
470 error:
471 iget_failed(inode);
472 return ERR_PTR(retval);
473
474 }
475
476 struct inode *
v9fs_inode_from_fid(struct v9fs_session_info * v9ses,struct p9_fid * fid,struct super_block * sb,int new)477 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
478 struct super_block *sb, int new)
479 {
480 struct p9_wstat *st;
481 struct inode *inode = NULL;
482
483 st = p9_client_stat(fid);
484 if (IS_ERR(st))
485 return ERR_CAST(st);
486
487 inode = v9fs_qid_iget(sb, &st->qid, st, new);
488 p9stat_free(st);
489 kfree(st);
490 return inode;
491 }
492
493 /**
494 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
495 * plan 9 AT flag.
496 * @flags: flags to convert
497 */
v9fs_at_to_dotl_flags(int flags)498 static int v9fs_at_to_dotl_flags(int flags)
499 {
500 int rflags = 0;
501 if (flags & AT_REMOVEDIR)
502 rflags |= P9_DOTL_AT_REMOVEDIR;
503 return rflags;
504 }
505
506 /**
507 * v9fs_dec_count - helper functon to drop i_nlink.
508 *
509 * If a directory had nlink <= 2 (including . and ..), then we should not drop
510 * the link count, which indicates the underlying exported fs doesn't maintain
511 * nlink accurately. e.g.
512 * - overlayfs sets nlink to 1 for merged dir
513 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more
514 * than EXT4_LINK_MAX (65000) links.
515 *
516 * @inode: inode whose nlink is being dropped
517 */
v9fs_dec_count(struct inode * inode)518 static void v9fs_dec_count(struct inode *inode)
519 {
520 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2)
521 drop_nlink(inode);
522 }
523
524 /**
525 * v9fs_remove - helper function to remove files and directories
526 * @dir: directory inode that is being deleted
527 * @dentry: dentry that is being deleted
528 * @flags: removing a directory
529 *
530 */
531
v9fs_remove(struct inode * dir,struct dentry * dentry,int flags)532 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
533 {
534 struct inode *inode;
535 int retval = -EOPNOTSUPP;
536 struct p9_fid *v9fid, *dfid;
537 struct v9fs_session_info *v9ses;
538
539 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
540 dir, dentry, flags);
541
542 v9ses = v9fs_inode2v9ses(dir);
543 inode = d_inode(dentry);
544 dfid = v9fs_parent_fid(dentry);
545 if (IS_ERR(dfid)) {
546 retval = PTR_ERR(dfid);
547 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
548 return retval;
549 }
550 if (v9fs_proto_dotl(v9ses))
551 retval = p9_client_unlinkat(dfid, dentry->d_name.name,
552 v9fs_at_to_dotl_flags(flags));
553 if (retval == -EOPNOTSUPP) {
554 /* Try the one based on path */
555 v9fid = v9fs_fid_clone(dentry);
556 if (IS_ERR(v9fid))
557 return PTR_ERR(v9fid);
558 retval = p9_client_remove(v9fid);
559 }
560 if (!retval) {
561 /*
562 * directories on unlink should have zero
563 * link count
564 */
565 if (flags & AT_REMOVEDIR) {
566 clear_nlink(inode);
567 v9fs_dec_count(dir);
568 } else
569 v9fs_dec_count(inode);
570
571 v9fs_invalidate_inode_attr(inode);
572 v9fs_invalidate_inode_attr(dir);
573 }
574 return retval;
575 }
576
577 /**
578 * v9fs_create - Create a file
579 * @v9ses: session information
580 * @dir: directory that dentry is being created in
581 * @dentry: dentry that is being created
582 * @extension: 9p2000.u extension string to support devices, etc.
583 * @perm: create permissions
584 * @mode: open mode
585 *
586 */
587 static struct p9_fid *
v9fs_create(struct v9fs_session_info * v9ses,struct inode * dir,struct dentry * dentry,char * extension,u32 perm,u8 mode)588 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
589 struct dentry *dentry, char *extension, u32 perm, u8 mode)
590 {
591 int err;
592 const unsigned char *name;
593 struct p9_fid *dfid, *ofid, *fid;
594 struct inode *inode;
595
596 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
597
598 err = 0;
599 ofid = NULL;
600 fid = NULL;
601 name = dentry->d_name.name;
602 dfid = v9fs_parent_fid(dentry);
603 if (IS_ERR(dfid)) {
604 err = PTR_ERR(dfid);
605 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
606 return ERR_PTR(err);
607 }
608
609 /* clone a fid to use for creation */
610 ofid = clone_fid(dfid);
611 if (IS_ERR(ofid)) {
612 err = PTR_ERR(ofid);
613 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
614 return ERR_PTR(err);
615 }
616
617 err = p9_client_fcreate(ofid, name, perm, mode, extension);
618 if (err < 0) {
619 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
620 goto error;
621 }
622
623 if (!(perm & P9_DMLINK)) {
624 /* now walk from the parent so we can get unopened fid */
625 fid = p9_client_walk(dfid, 1, &name, 1);
626 if (IS_ERR(fid)) {
627 err = PTR_ERR(fid);
628 p9_debug(P9_DEBUG_VFS,
629 "p9_client_walk failed %d\n", err);
630 fid = NULL;
631 goto error;
632 }
633 /*
634 * instantiate inode and assign the unopened fid to the dentry
635 */
636 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
637 if (IS_ERR(inode)) {
638 err = PTR_ERR(inode);
639 p9_debug(P9_DEBUG_VFS,
640 "inode creation failed %d\n", err);
641 goto error;
642 }
643 v9fs_fid_add(dentry, fid);
644 d_instantiate(dentry, inode);
645 }
646 return ofid;
647 error:
648 if (ofid)
649 p9_client_clunk(ofid);
650
651 if (fid)
652 p9_client_clunk(fid);
653
654 return ERR_PTR(err);
655 }
656
657 /**
658 * v9fs_vfs_create - VFS hook to create a regular file
659 *
660 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called
661 * for mknod(2).
662 *
663 * @dir: directory inode that is being created
664 * @dentry: dentry that is being deleted
665 * @mode: create permissions
666 *
667 */
668
669 static int
v9fs_vfs_create(struct inode * dir,struct dentry * dentry,umode_t mode,bool excl)670 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
671 bool excl)
672 {
673 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
674 u32 perm = unixmode2p9mode(v9ses, mode);
675 struct p9_fid *fid;
676
677 /* P9_OEXCL? */
678 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR);
679 if (IS_ERR(fid))
680 return PTR_ERR(fid);
681
682 v9fs_invalidate_inode_attr(dir);
683 p9_client_clunk(fid);
684
685 return 0;
686 }
687
688 /**
689 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
690 * @dir: inode that is being unlinked
691 * @dentry: dentry that is being unlinked
692 * @mode: mode for new directory
693 *
694 */
695
v9fs_vfs_mkdir(struct inode * dir,struct dentry * dentry,umode_t mode)696 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
697 {
698 int err;
699 u32 perm;
700 struct p9_fid *fid;
701 struct v9fs_session_info *v9ses;
702
703 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
704 err = 0;
705 v9ses = v9fs_inode2v9ses(dir);
706 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
707 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
708 if (IS_ERR(fid)) {
709 err = PTR_ERR(fid);
710 fid = NULL;
711 } else {
712 inc_nlink(dir);
713 v9fs_invalidate_inode_attr(dir);
714 }
715
716 if (fid)
717 p9_client_clunk(fid);
718
719 return err;
720 }
721
722 /**
723 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
724 * @dir: inode that is being walked from
725 * @dentry: dentry that is being walked to?
726 * @flags: lookup flags (unused)
727 *
728 */
729
v9fs_vfs_lookup(struct inode * dir,struct dentry * dentry,unsigned int flags)730 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
731 unsigned int flags)
732 {
733 struct dentry *res;
734 struct v9fs_session_info *v9ses;
735 struct p9_fid *dfid, *fid;
736 struct inode *inode;
737 const unsigned char *name;
738
739 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n",
740 dir, dentry, dentry, flags);
741
742 if (dentry->d_name.len > NAME_MAX)
743 return ERR_PTR(-ENAMETOOLONG);
744
745 v9ses = v9fs_inode2v9ses(dir);
746 /* We can walk d_parent because we hold the dir->i_mutex */
747 dfid = v9fs_parent_fid(dentry);
748 if (IS_ERR(dfid))
749 return ERR_CAST(dfid);
750
751 /*
752 * Make sure we don't use a wrong inode due to parallel
753 * unlink. For cached mode create calls request for new
754 * inode. But with cache disabled, lookup should do this.
755 */
756 name = dentry->d_name.name;
757 fid = p9_client_walk(dfid, 1, &name, 1);
758 if (fid == ERR_PTR(-ENOENT))
759 inode = NULL;
760 else if (IS_ERR(fid))
761 inode = ERR_CAST(fid);
762 else if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
763 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
764 else
765 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
766 /*
767 * If we had a rename on the server and a parallel lookup
768 * for the new name, then make sure we instantiate with
769 * the new name. ie look up for a/b, while on server somebody
770 * moved b under k and client parallely did a lookup for
771 * k/b.
772 */
773 res = d_splice_alias(inode, dentry);
774 if (!IS_ERR(fid)) {
775 if (!res)
776 v9fs_fid_add(dentry, fid);
777 else if (!IS_ERR(res))
778 v9fs_fid_add(res, fid);
779 else
780 p9_client_clunk(fid);
781 }
782 return res;
783 }
784
785 static int
v9fs_vfs_atomic_open(struct inode * dir,struct dentry * dentry,struct file * file,unsigned flags,umode_t mode)786 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
787 struct file *file, unsigned flags, umode_t mode)
788 {
789 int err;
790 u32 perm;
791 struct v9fs_inode *v9inode;
792 struct v9fs_session_info *v9ses;
793 struct p9_fid *fid, *inode_fid;
794 struct dentry *res = NULL;
795
796 if (d_in_lookup(dentry)) {
797 res = v9fs_vfs_lookup(dir, dentry, 0);
798 if (IS_ERR(res))
799 return PTR_ERR(res);
800
801 if (res)
802 dentry = res;
803 }
804
805 /* Only creates */
806 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
807 return finish_no_open(file, res);
808
809 err = 0;
810
811 v9ses = v9fs_inode2v9ses(dir);
812 perm = unixmode2p9mode(v9ses, mode);
813 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
814 v9fs_uflags2omode(flags,
815 v9fs_proto_dotu(v9ses)));
816 if (IS_ERR(fid)) {
817 err = PTR_ERR(fid);
818 fid = NULL;
819 goto error;
820 }
821
822 v9fs_invalidate_inode_attr(dir);
823 v9inode = V9FS_I(d_inode(dentry));
824 mutex_lock(&v9inode->v_mutex);
825 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
826 !v9inode->writeback_fid &&
827 ((flags & O_ACCMODE) != O_RDONLY)) {
828 /*
829 * clone a fid and add it to writeback_fid
830 * we do it during open time instead of
831 * page dirty time via write_begin/page_mkwrite
832 * because we want write after unlink usecase
833 * to work.
834 */
835 inode_fid = v9fs_writeback_fid(dentry);
836 if (IS_ERR(inode_fid)) {
837 err = PTR_ERR(inode_fid);
838 mutex_unlock(&v9inode->v_mutex);
839 goto error;
840 }
841 v9inode->writeback_fid = (void *) inode_fid;
842 }
843 mutex_unlock(&v9inode->v_mutex);
844 err = finish_open(file, dentry, generic_file_open);
845 if (err)
846 goto error;
847
848 file->private_data = fid;
849 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
850 v9fs_cache_inode_set_cookie(d_inode(dentry), file);
851
852 file->f_mode |= FMODE_CREATED;
853 out:
854 dput(res);
855 return err;
856
857 error:
858 if (fid)
859 p9_client_clunk(fid);
860 goto out;
861 }
862
863 /**
864 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
865 * @i: inode that is being unlinked
866 * @d: dentry that is being unlinked
867 *
868 */
869
v9fs_vfs_unlink(struct inode * i,struct dentry * d)870 int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
871 {
872 return v9fs_remove(i, d, 0);
873 }
874
875 /**
876 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
877 * @i: inode that is being unlinked
878 * @d: dentry that is being unlinked
879 *
880 */
881
v9fs_vfs_rmdir(struct inode * i,struct dentry * d)882 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
883 {
884 return v9fs_remove(i, d, AT_REMOVEDIR);
885 }
886
887 /**
888 * v9fs_vfs_rename - VFS hook to rename an inode
889 * @old_dir: old dir inode
890 * @old_dentry: old dentry
891 * @new_dir: new dir inode
892 * @new_dentry: new dentry
893 *
894 */
895
896 int
v9fs_vfs_rename(struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)897 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
898 struct inode *new_dir, struct dentry *new_dentry,
899 unsigned int flags)
900 {
901 int retval;
902 struct inode *old_inode;
903 struct inode *new_inode;
904 struct v9fs_session_info *v9ses;
905 struct p9_fid *oldfid;
906 struct p9_fid *olddirfid;
907 struct p9_fid *newdirfid;
908 struct p9_wstat wstat;
909
910 if (flags)
911 return -EINVAL;
912
913 p9_debug(P9_DEBUG_VFS, "\n");
914 retval = 0;
915 old_inode = d_inode(old_dentry);
916 new_inode = d_inode(new_dentry);
917 v9ses = v9fs_inode2v9ses(old_inode);
918 oldfid = v9fs_fid_lookup(old_dentry);
919 if (IS_ERR(oldfid))
920 return PTR_ERR(oldfid);
921
922 olddirfid = clone_fid(v9fs_parent_fid(old_dentry));
923 if (IS_ERR(olddirfid)) {
924 retval = PTR_ERR(olddirfid);
925 goto done;
926 }
927
928 newdirfid = clone_fid(v9fs_parent_fid(new_dentry));
929 if (IS_ERR(newdirfid)) {
930 retval = PTR_ERR(newdirfid);
931 goto clunk_olddir;
932 }
933
934 down_write(&v9ses->rename_sem);
935 if (v9fs_proto_dotl(v9ses)) {
936 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
937 newdirfid, new_dentry->d_name.name);
938 if (retval == -EOPNOTSUPP)
939 retval = p9_client_rename(oldfid, newdirfid,
940 new_dentry->d_name.name);
941 if (retval != -EOPNOTSUPP)
942 goto clunk_newdir;
943 }
944 if (old_dentry->d_parent != new_dentry->d_parent) {
945 /*
946 * 9P .u can only handle file rename in the same directory
947 */
948
949 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
950 retval = -EXDEV;
951 goto clunk_newdir;
952 }
953 v9fs_blank_wstat(&wstat);
954 wstat.muid = v9ses->uname;
955 wstat.name = new_dentry->d_name.name;
956 retval = p9_client_wstat(oldfid, &wstat);
957
958 clunk_newdir:
959 if (!retval) {
960 if (new_inode) {
961 if (S_ISDIR(new_inode->i_mode))
962 clear_nlink(new_inode);
963 else
964 v9fs_dec_count(new_inode);
965 }
966 if (S_ISDIR(old_inode->i_mode)) {
967 if (!new_inode)
968 inc_nlink(new_dir);
969 v9fs_dec_count(old_dir);
970 }
971 v9fs_invalidate_inode_attr(old_inode);
972 v9fs_invalidate_inode_attr(old_dir);
973 v9fs_invalidate_inode_attr(new_dir);
974
975 /* successful rename */
976 d_move(old_dentry, new_dentry);
977 }
978 up_write(&v9ses->rename_sem);
979 p9_client_clunk(newdirfid);
980
981 clunk_olddir:
982 p9_client_clunk(olddirfid);
983
984 done:
985 return retval;
986 }
987
988 /**
989 * v9fs_vfs_getattr - retrieve file metadata
990 * @path: Object to query
991 * @stat: metadata structure to populate
992 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
993 * @flags: AT_STATX_xxx setting
994 *
995 */
996
997 static int
v9fs_vfs_getattr(const struct path * path,struct kstat * stat,u32 request_mask,unsigned int flags)998 v9fs_vfs_getattr(const struct path *path, struct kstat *stat,
999 u32 request_mask, unsigned int flags)
1000 {
1001 struct dentry *dentry = path->dentry;
1002 struct v9fs_session_info *v9ses;
1003 struct p9_fid *fid;
1004 struct p9_wstat *st;
1005
1006 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1007 v9ses = v9fs_dentry2v9ses(dentry);
1008 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1009 generic_fillattr(d_inode(dentry), stat);
1010 return 0;
1011 }
1012 fid = v9fs_fid_lookup(dentry);
1013 if (IS_ERR(fid))
1014 return PTR_ERR(fid);
1015
1016 st = p9_client_stat(fid);
1017 if (IS_ERR(st))
1018 return PTR_ERR(st);
1019
1020 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0);
1021 generic_fillattr(d_inode(dentry), stat);
1022
1023 p9stat_free(st);
1024 kfree(st);
1025 return 0;
1026 }
1027
1028 /**
1029 * v9fs_vfs_setattr - set file metadata
1030 * @dentry: file whose metadata to set
1031 * @iattr: metadata assignment structure
1032 *
1033 */
1034
v9fs_vfs_setattr(struct dentry * dentry,struct iattr * iattr)1035 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
1036 {
1037 int retval;
1038 struct v9fs_session_info *v9ses;
1039 struct p9_fid *fid = NULL;
1040 struct p9_wstat wstat;
1041
1042 p9_debug(P9_DEBUG_VFS, "\n");
1043 retval = setattr_prepare(dentry, iattr);
1044 if (retval)
1045 return retval;
1046
1047 retval = -EPERM;
1048 v9ses = v9fs_dentry2v9ses(dentry);
1049 if (iattr->ia_valid & ATTR_FILE) {
1050 fid = iattr->ia_file->private_data;
1051 WARN_ON(!fid);
1052 }
1053 if (!fid)
1054 fid = v9fs_fid_lookup(dentry);
1055 if(IS_ERR(fid))
1056 return PTR_ERR(fid);
1057
1058 v9fs_blank_wstat(&wstat);
1059 if (iattr->ia_valid & ATTR_MODE)
1060 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1061
1062 if (iattr->ia_valid & ATTR_MTIME)
1063 wstat.mtime = iattr->ia_mtime.tv_sec;
1064
1065 if (iattr->ia_valid & ATTR_ATIME)
1066 wstat.atime = iattr->ia_atime.tv_sec;
1067
1068 if (iattr->ia_valid & ATTR_SIZE)
1069 wstat.length = iattr->ia_size;
1070
1071 if (v9fs_proto_dotu(v9ses)) {
1072 if (iattr->ia_valid & ATTR_UID)
1073 wstat.n_uid = iattr->ia_uid;
1074
1075 if (iattr->ia_valid & ATTR_GID)
1076 wstat.n_gid = iattr->ia_gid;
1077 }
1078
1079 /* Write all dirty data */
1080 if (d_is_reg(dentry))
1081 filemap_write_and_wait(d_inode(dentry)->i_mapping);
1082
1083 retval = p9_client_wstat(fid, &wstat);
1084 if (retval < 0)
1085 return retval;
1086
1087 if ((iattr->ia_valid & ATTR_SIZE) &&
1088 iattr->ia_size != i_size_read(d_inode(dentry)))
1089 truncate_setsize(d_inode(dentry), iattr->ia_size);
1090
1091 v9fs_invalidate_inode_attr(d_inode(dentry));
1092
1093 setattr_copy(d_inode(dentry), iattr);
1094 mark_inode_dirty(d_inode(dentry));
1095 return 0;
1096 }
1097
1098 /**
1099 * v9fs_stat2inode - populate an inode structure with mistat info
1100 * @stat: Plan 9 metadata (mistat) structure
1101 * @inode: inode to populate
1102 * @sb: superblock of filesystem
1103 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
1104 *
1105 */
1106
1107 void
v9fs_stat2inode(struct p9_wstat * stat,struct inode * inode,struct super_block * sb,unsigned int flags)1108 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1109 struct super_block *sb, unsigned int flags)
1110 {
1111 umode_t mode;
1112 char ext[32];
1113 char tag_name[14];
1114 unsigned int i_nlink;
1115 struct v9fs_session_info *v9ses = sb->s_fs_info;
1116 struct v9fs_inode *v9inode = V9FS_I(inode);
1117
1118 set_nlink(inode, 1);
1119
1120 inode->i_atime.tv_sec = stat->atime;
1121 inode->i_mtime.tv_sec = stat->mtime;
1122 inode->i_ctime.tv_sec = stat->mtime;
1123
1124 inode->i_uid = v9ses->dfltuid;
1125 inode->i_gid = v9ses->dfltgid;
1126
1127 if (v9fs_proto_dotu(v9ses)) {
1128 inode->i_uid = stat->n_uid;
1129 inode->i_gid = stat->n_gid;
1130 }
1131 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1132 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1133 /*
1134 * Hadlink support got added later to
1135 * to the .u extension. So there can be
1136 * server out there that doesn't support
1137 * this even with .u extension. So check
1138 * for non NULL stat->extension
1139 */
1140 strlcpy(ext, stat->extension, sizeof(ext));
1141 /* HARDLINKCOUNT %u */
1142 sscanf(ext, "%13s %u", tag_name, &i_nlink);
1143 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1144 set_nlink(inode, i_nlink);
1145 }
1146 }
1147 mode = p9mode2perm(v9ses, stat);
1148 mode |= inode->i_mode & ~S_IALLUGO;
1149 inode->i_mode = mode;
1150
1151 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
1152 v9fs_i_size_write(inode, stat->length);
1153 /* not real number of blocks, but 512 byte ones ... */
1154 inode->i_blocks = (stat->length + 512 - 1) >> 9;
1155 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1156 }
1157
1158 /**
1159 * v9fs_qid2ino - convert qid into inode number
1160 * @qid: qid to hash
1161 *
1162 * BUG: potential for inode number collisions?
1163 */
1164
v9fs_qid2ino(struct p9_qid * qid)1165 ino_t v9fs_qid2ino(struct p9_qid *qid)
1166 {
1167 u64 path = qid->path + 2;
1168 ino_t i = 0;
1169
1170 if (sizeof(ino_t) == sizeof(path))
1171 memcpy(&i, &path, sizeof(ino_t));
1172 else
1173 i = (ino_t) (path ^ (path >> 32));
1174
1175 return i;
1176 }
1177
1178 /**
1179 * v9fs_vfs_get_link - follow a symlink path
1180 * @dentry: dentry for symlink
1181 * @inode: inode for symlink
1182 * @done: delayed call for when we are done with the return value
1183 */
1184
v9fs_vfs_get_link(struct dentry * dentry,struct inode * inode,struct delayed_call * done)1185 static const char *v9fs_vfs_get_link(struct dentry *dentry,
1186 struct inode *inode,
1187 struct delayed_call *done)
1188 {
1189 struct v9fs_session_info *v9ses;
1190 struct p9_fid *fid;
1191 struct p9_wstat *st;
1192 char *res;
1193
1194 if (!dentry)
1195 return ERR_PTR(-ECHILD);
1196
1197 v9ses = v9fs_dentry2v9ses(dentry);
1198 fid = v9fs_fid_lookup(dentry);
1199 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
1200
1201 if (IS_ERR(fid))
1202 return ERR_CAST(fid);
1203
1204 if (!v9fs_proto_dotu(v9ses))
1205 return ERR_PTR(-EBADF);
1206
1207 st = p9_client_stat(fid);
1208 if (IS_ERR(st))
1209 return ERR_CAST(st);
1210
1211 if (!(st->mode & P9_DMSYMLINK)) {
1212 p9stat_free(st);
1213 kfree(st);
1214 return ERR_PTR(-EINVAL);
1215 }
1216 res = st->extension;
1217 st->extension = NULL;
1218 if (strlen(res) >= PATH_MAX)
1219 res[PATH_MAX - 1] = '\0';
1220
1221 p9stat_free(st);
1222 kfree(st);
1223 set_delayed_call(done, kfree_link, res);
1224 return res;
1225 }
1226
1227 /**
1228 * v9fs_vfs_mkspecial - create a special file
1229 * @dir: inode to create special file in
1230 * @dentry: dentry to create
1231 * @perm: mode to create special file
1232 * @extension: 9p2000.u format extension string representing special file
1233 *
1234 */
1235
v9fs_vfs_mkspecial(struct inode * dir,struct dentry * dentry,u32 perm,const char * extension)1236 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1237 u32 perm, const char *extension)
1238 {
1239 struct p9_fid *fid;
1240 struct v9fs_session_info *v9ses;
1241
1242 v9ses = v9fs_inode2v9ses(dir);
1243 if (!v9fs_proto_dotu(v9ses)) {
1244 p9_debug(P9_DEBUG_ERROR, "not extended\n");
1245 return -EPERM;
1246 }
1247
1248 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1249 P9_OREAD);
1250 if (IS_ERR(fid))
1251 return PTR_ERR(fid);
1252
1253 v9fs_invalidate_inode_attr(dir);
1254 p9_client_clunk(fid);
1255 return 0;
1256 }
1257
1258 /**
1259 * v9fs_vfs_symlink - helper function to create symlinks
1260 * @dir: directory inode containing symlink
1261 * @dentry: dentry for symlink
1262 * @symname: symlink data
1263 *
1264 * See Also: 9P2000.u RFC for more information
1265 *
1266 */
1267
1268 static int
v9fs_vfs_symlink(struct inode * dir,struct dentry * dentry,const char * symname)1269 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1270 {
1271 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n",
1272 dir->i_ino, dentry, symname);
1273
1274 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname);
1275 }
1276
1277 #define U32_MAX_DIGITS 10
1278
1279 /**
1280 * v9fs_vfs_link - create a hardlink
1281 * @old_dentry: dentry for file to link to
1282 * @dir: inode destination for new link
1283 * @dentry: dentry for link
1284 *
1285 */
1286
1287 static int
v9fs_vfs_link(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)1288 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1289 struct dentry *dentry)
1290 {
1291 int retval;
1292 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */
1293 struct p9_fid *oldfid;
1294
1295 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n",
1296 dir->i_ino, dentry, old_dentry);
1297
1298 oldfid = v9fs_fid_clone(old_dentry);
1299 if (IS_ERR(oldfid))
1300 return PTR_ERR(oldfid);
1301
1302 sprintf(name, "%d\n", oldfid->fid);
1303 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1304 if (!retval) {
1305 v9fs_refresh_inode(oldfid, d_inode(old_dentry));
1306 v9fs_invalidate_inode_attr(dir);
1307 }
1308 p9_client_clunk(oldfid);
1309 return retval;
1310 }
1311
1312 /**
1313 * v9fs_vfs_mknod - create a special file
1314 * @dir: inode destination for new link
1315 * @dentry: dentry for file
1316 * @mode: mode for creation
1317 * @rdev: device associated with special file
1318 *
1319 */
1320
1321 static int
v9fs_vfs_mknod(struct inode * dir,struct dentry * dentry,umode_t mode,dev_t rdev)1322 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
1323 {
1324 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1325 int retval;
1326 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1];
1327 u32 perm;
1328
1329 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
1330 dir->i_ino, dentry, mode,
1331 MAJOR(rdev), MINOR(rdev));
1332
1333 /* build extension */
1334 if (S_ISBLK(mode))
1335 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1336 else if (S_ISCHR(mode))
1337 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1338 else
1339 *name = 0;
1340
1341 perm = unixmode2p9mode(v9ses, mode);
1342 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name);
1343
1344 return retval;
1345 }
1346
v9fs_refresh_inode(struct p9_fid * fid,struct inode * inode)1347 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1348 {
1349 int umode;
1350 dev_t rdev;
1351 struct p9_wstat *st;
1352 struct v9fs_session_info *v9ses;
1353 unsigned int flags;
1354
1355 v9ses = v9fs_inode2v9ses(inode);
1356 st = p9_client_stat(fid);
1357 if (IS_ERR(st))
1358 return PTR_ERR(st);
1359 /*
1360 * Don't update inode if the file type is different
1361 */
1362 umode = p9mode2unixmode(v9ses, st, &rdev);
1363 if (inode_wrong_type(inode, umode))
1364 goto out;
1365
1366 /*
1367 * We don't want to refresh inode->i_size,
1368 * because we may have cached data
1369 */
1370 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
1371 V9FS_STAT2INODE_KEEP_ISIZE : 0;
1372 v9fs_stat2inode(st, inode, inode->i_sb, flags);
1373 out:
1374 p9stat_free(st);
1375 kfree(st);
1376 return 0;
1377 }
1378
1379 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1380 .create = v9fs_vfs_create,
1381 .lookup = v9fs_vfs_lookup,
1382 .atomic_open = v9fs_vfs_atomic_open,
1383 .symlink = v9fs_vfs_symlink,
1384 .link = v9fs_vfs_link,
1385 .unlink = v9fs_vfs_unlink,
1386 .mkdir = v9fs_vfs_mkdir,
1387 .rmdir = v9fs_vfs_rmdir,
1388 .mknod = v9fs_vfs_mknod,
1389 .rename = v9fs_vfs_rename,
1390 .getattr = v9fs_vfs_getattr,
1391 .setattr = v9fs_vfs_setattr,
1392 };
1393
1394 static const struct inode_operations v9fs_dir_inode_operations = {
1395 .create = v9fs_vfs_create,
1396 .lookup = v9fs_vfs_lookup,
1397 .atomic_open = v9fs_vfs_atomic_open,
1398 .unlink = v9fs_vfs_unlink,
1399 .mkdir = v9fs_vfs_mkdir,
1400 .rmdir = v9fs_vfs_rmdir,
1401 .mknod = v9fs_vfs_mknod,
1402 .rename = v9fs_vfs_rename,
1403 .getattr = v9fs_vfs_getattr,
1404 .setattr = v9fs_vfs_setattr,
1405 };
1406
1407 static const struct inode_operations v9fs_file_inode_operations = {
1408 .getattr = v9fs_vfs_getattr,
1409 .setattr = v9fs_vfs_setattr,
1410 };
1411
1412 static const struct inode_operations v9fs_symlink_inode_operations = {
1413 .get_link = v9fs_vfs_get_link,
1414 .getattr = v9fs_vfs_getattr,
1415 .setattr = v9fs_vfs_setattr,
1416 };
1417
1418