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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * This file contains vfs inode ops for the 9P2000 protocol.
4 *
5 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
6 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
7 */
8
9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <linux/module.h>
12#include <linux/errno.h>
13#include <linux/fs.h>
14#include <linux/file.h>
15#include <linux/pagemap.h>
16#include <linux/stat.h>
17#include <linux/string.h>
18#include <linux/inet.h>
19#include <linux/namei.h>
20#include <linux/sched.h>
21#include <linux/slab.h>
22#include <linux/xattr.h>
23#include <linux/posix_acl.h>
24#include <net/9p/9p.h>
25#include <net/9p/client.h>
26
27#include "v9fs.h"
28#include "v9fs_vfs.h"
29#include "fid.h"
30#include "cache.h"
31#include "xattr.h"
32#include "acl.h"
33
34static const struct inode_operations v9fs_dir_inode_operations;
35static const struct inode_operations v9fs_dir_inode_operations_dotu;
36static const struct inode_operations v9fs_file_inode_operations;
37static const struct inode_operations v9fs_symlink_inode_operations;
38
39/**
40 * unixmode2p9mode - convert unix mode bits to plan 9
41 * @v9ses: v9fs session information
42 * @mode: mode to convert
43 *
44 */
45
46static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode)
47{
48 int res;
49
50 res = mode & 0777;
51 if (S_ISDIR(mode))
52 res |= P9_DMDIR;
53 if (v9fs_proto_dotu(v9ses)) {
54 if (v9ses->nodev == 0) {
55 if (S_ISSOCK(mode))
56 res |= P9_DMSOCKET;
57 if (S_ISFIFO(mode))
58 res |= P9_DMNAMEDPIPE;
59 if (S_ISBLK(mode))
60 res |= P9_DMDEVICE;
61 if (S_ISCHR(mode))
62 res |= P9_DMDEVICE;
63 }
64
65 if ((mode & S_ISUID) == S_ISUID)
66 res |= P9_DMSETUID;
67 if ((mode & S_ISGID) == S_ISGID)
68 res |= P9_DMSETGID;
69 if ((mode & S_ISVTX) == S_ISVTX)
70 res |= P9_DMSETVTX;
71 }
72 return res;
73}
74
75/**
76 * p9mode2perm- convert plan9 mode bits to unix permission bits
77 * @v9ses: v9fs session information
78 * @stat: p9_wstat from which mode need to be derived
79 *
80 */
81static int p9mode2perm(struct v9fs_session_info *v9ses,
82 struct p9_wstat *stat)
83{
84 int res;
85 int mode = stat->mode;
86
87 res = mode & S_IALLUGO;
88 if (v9fs_proto_dotu(v9ses)) {
89 if ((mode & P9_DMSETUID) == P9_DMSETUID)
90 res |= S_ISUID;
91
92 if ((mode & P9_DMSETGID) == P9_DMSETGID)
93 res |= S_ISGID;
94
95 if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
96 res |= S_ISVTX;
97 }
98 return res;
99}
100
101/**
102 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
103 * @v9ses: v9fs session information
104 * @stat: p9_wstat from which mode need to be derived
105 * @rdev: major number, minor number in case of device files.
106 *
107 */
108static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses,
109 struct p9_wstat *stat, dev_t *rdev)
110{
111 int res, r;
112 u32 mode = stat->mode;
113
114 *rdev = 0;
115 res = p9mode2perm(v9ses, stat);
116
117 if ((mode & P9_DMDIR) == P9_DMDIR)
118 res |= S_IFDIR;
119 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
120 res |= S_IFLNK;
121 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
122 && (v9ses->nodev == 0))
123 res |= S_IFSOCK;
124 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
125 && (v9ses->nodev == 0))
126 res |= S_IFIFO;
127 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
128 && (v9ses->nodev == 0)) {
129 char type = 0;
130 int major = -1, minor = -1;
131
132 r = sscanf(stat->extension, "%c %i %i", &type, &major, &minor);
133 if (r != 3) {
134 p9_debug(P9_DEBUG_ERROR,
135 "invalid device string, umode will be bogus: %s\n",
136 stat->extension);
137 return res;
138 }
139 switch (type) {
140 case 'c':
141 res |= S_IFCHR;
142 break;
143 case 'b':
144 res |= S_IFBLK;
145 break;
146 default:
147 p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n",
148 type, stat->extension);
149 }
150 *rdev = MKDEV(major, minor);
151 } else
152 res |= S_IFREG;
153
154 return res;
155}
156
157/**
158 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
159 * @uflags: flags to convert
160 * @extended: if .u extensions are active
161 */
162
163int v9fs_uflags2omode(int uflags, int extended)
164{
165 int ret;
166
167 ret = 0;
168 switch (uflags&3) {
169 default:
170 case O_RDONLY:
171 ret = P9_OREAD;
172 break;
173
174 case O_WRONLY:
175 ret = P9_OWRITE;
176 break;
177
178 case O_RDWR:
179 ret = P9_ORDWR;
180 break;
181 }
182
183 if (extended) {
184 if (uflags & O_EXCL)
185 ret |= P9_OEXCL;
186
187 if (uflags & O_APPEND)
188 ret |= P9_OAPPEND;
189 }
190
191 return ret;
192}
193
194/**
195 * v9fs_blank_wstat - helper function to setup a 9P stat structure
196 * @wstat: structure to initialize
197 *
198 */
199
200void
201v9fs_blank_wstat(struct p9_wstat *wstat)
202{
203 wstat->type = ~0;
204 wstat->dev = ~0;
205 wstat->qid.type = ~0;
206 wstat->qid.version = ~0;
207 *((long long *)&wstat->qid.path) = ~0;
208 wstat->mode = ~0;
209 wstat->atime = ~0;
210 wstat->mtime = ~0;
211 wstat->length = ~0;
212 wstat->name = NULL;
213 wstat->uid = NULL;
214 wstat->gid = NULL;
215 wstat->muid = NULL;
216 wstat->n_uid = INVALID_UID;
217 wstat->n_gid = INVALID_GID;
218 wstat->n_muid = INVALID_UID;
219 wstat->extension = NULL;
220}
221
222/**
223 * v9fs_alloc_inode - helper function to allocate an inode
224 * @sb: The superblock to allocate the inode from
225 */
226struct inode *v9fs_alloc_inode(struct super_block *sb)
227{
228 struct v9fs_inode *v9inode;
229
230 v9inode = alloc_inode_sb(sb, v9fs_inode_cache, GFP_KERNEL);
231 if (!v9inode)
232 return NULL;
233 v9inode->writeback_fid = NULL;
234 v9inode->cache_validity = 0;
235 mutex_init(&v9inode->v_mutex);
236 return &v9inode->netfs.inode;
237}
238
239/**
240 * v9fs_free_inode - destroy an inode
241 * @inode: The inode to be freed
242 */
243
244void v9fs_free_inode(struct inode *inode)
245{
246 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
247}
248
249/*
250 * Set parameters for the netfs library
251 */
252static void v9fs_set_netfs_context(struct inode *inode)
253{
254 struct v9fs_inode *v9inode = V9FS_I(inode);
255 netfs_inode_init(&v9inode->netfs, &v9fs_req_ops);
256}
257
258int v9fs_init_inode(struct v9fs_session_info *v9ses,
259 struct inode *inode, umode_t mode, dev_t rdev)
260{
261 int err = 0;
262
263 inode_init_owner(&init_user_ns, inode, NULL, mode);
264 inode->i_blocks = 0;
265 inode->i_rdev = rdev;
266 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
267 inode->i_mapping->a_ops = &v9fs_addr_operations;
268 inode->i_private = NULL;
269
270 switch (mode & S_IFMT) {
271 case S_IFIFO:
272 case S_IFBLK:
273 case S_IFCHR:
274 case S_IFSOCK:
275 if (v9fs_proto_dotl(v9ses)) {
276 inode->i_op = &v9fs_file_inode_operations_dotl;
277 } else if (v9fs_proto_dotu(v9ses)) {
278 inode->i_op = &v9fs_file_inode_operations;
279 } else {
280 p9_debug(P9_DEBUG_ERROR,
281 "special files without extended mode\n");
282 err = -EINVAL;
283 goto error;
284 }
285 init_special_inode(inode, inode->i_mode, inode->i_rdev);
286 break;
287 case S_IFREG:
288 if (v9fs_proto_dotl(v9ses)) {
289 inode->i_op = &v9fs_file_inode_operations_dotl;
290 if (v9ses->cache == CACHE_LOOSE ||
291 v9ses->cache == CACHE_FSCACHE)
292 inode->i_fop =
293 &v9fs_cached_file_operations_dotl;
294 else if (v9ses->cache == CACHE_MMAP)
295 inode->i_fop = &v9fs_mmap_file_operations_dotl;
296 else
297 inode->i_fop = &v9fs_file_operations_dotl;
298 } else {
299 inode->i_op = &v9fs_file_inode_operations;
300 if (v9ses->cache == CACHE_LOOSE ||
301 v9ses->cache == CACHE_FSCACHE)
302 inode->i_fop =
303 &v9fs_cached_file_operations;
304 else if (v9ses->cache == CACHE_MMAP)
305 inode->i_fop = &v9fs_mmap_file_operations;
306 else
307 inode->i_fop = &v9fs_file_operations;
308 }
309
310 break;
311 case S_IFLNK:
312 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
313 p9_debug(P9_DEBUG_ERROR,
314 "extended modes used with legacy protocol\n");
315 err = -EINVAL;
316 goto error;
317 }
318
319 if (v9fs_proto_dotl(v9ses))
320 inode->i_op = &v9fs_symlink_inode_operations_dotl;
321 else
322 inode->i_op = &v9fs_symlink_inode_operations;
323
324 break;
325 case S_IFDIR:
326 inc_nlink(inode);
327 if (v9fs_proto_dotl(v9ses))
328 inode->i_op = &v9fs_dir_inode_operations_dotl;
329 else if (v9fs_proto_dotu(v9ses))
330 inode->i_op = &v9fs_dir_inode_operations_dotu;
331 else
332 inode->i_op = &v9fs_dir_inode_operations;
333
334 if (v9fs_proto_dotl(v9ses))
335 inode->i_fop = &v9fs_dir_operations_dotl;
336 else
337 inode->i_fop = &v9fs_dir_operations;
338
339 break;
340 default:
341 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n",
342 mode, mode & S_IFMT);
343 err = -EINVAL;
344 goto error;
345 }
346
347 v9fs_set_netfs_context(inode);
348error:
349 return err;
350
351}
352
353/**
354 * v9fs_get_inode - helper function to setup an inode
355 * @sb: superblock
356 * @mode: mode to setup inode with
357 * @rdev: The device numbers to set
358 */
359
360struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev)
361{
362 int err;
363 struct inode *inode;
364 struct v9fs_session_info *v9ses = sb->s_fs_info;
365
366 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode);
367
368 inode = new_inode(sb);
369 if (!inode) {
370 pr_warn("%s (%d): Problem allocating inode\n",
371 __func__, task_pid_nr(current));
372 return ERR_PTR(-ENOMEM);
373 }
374 err = v9fs_init_inode(v9ses, inode, mode, rdev);
375 if (err) {
376 iput(inode);
377 return ERR_PTR(err);
378 }
379 return inode;
380}
381
382/**
383 * v9fs_evict_inode - Remove an inode from the inode cache
384 * @inode: inode to release
385 *
386 */
387void v9fs_evict_inode(struct inode *inode)
388{
389 struct v9fs_inode *v9inode = V9FS_I(inode);
390 __le32 version;
391
392 truncate_inode_pages_final(&inode->i_data);
393 version = cpu_to_le32(v9inode->qid.version);
394 fscache_clear_inode_writeback(v9fs_inode_cookie(v9inode), inode,
395 &version);
396 clear_inode(inode);
397 filemap_fdatawrite(&inode->i_data);
398
399 fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false);
400 /* clunk the fid stashed in writeback_fid */
401 p9_fid_put(v9inode->writeback_fid);
402 v9inode->writeback_fid = NULL;
403}
404
405static int v9fs_test_inode(struct inode *inode, void *data)
406{
407 int umode;
408 dev_t rdev;
409 struct v9fs_inode *v9inode = V9FS_I(inode);
410 struct p9_wstat *st = (struct p9_wstat *)data;
411 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
412
413 umode = p9mode2unixmode(v9ses, st, &rdev);
414 /* don't match inode of different type */
415 if (inode_wrong_type(inode, umode))
416 return 0;
417
418 /* compare qid details */
419 if (memcmp(&v9inode->qid.version,
420 &st->qid.version, sizeof(v9inode->qid.version)))
421 return 0;
422
423 if (v9inode->qid.type != st->qid.type)
424 return 0;
425
426 if (v9inode->qid.path != st->qid.path)
427 return 0;
428 return 1;
429}
430
431static int v9fs_test_new_inode(struct inode *inode, void *data)
432{
433 return 0;
434}
435
436static int v9fs_set_inode(struct inode *inode, void *data)
437{
438 struct v9fs_inode *v9inode = V9FS_I(inode);
439 struct p9_wstat *st = (struct p9_wstat *)data;
440
441 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
442 return 0;
443}
444
445static struct inode *v9fs_qid_iget(struct super_block *sb,
446 struct p9_qid *qid,
447 struct p9_wstat *st,
448 int new)
449{
450 dev_t rdev;
451 int retval;
452 umode_t umode;
453 unsigned long i_ino;
454 struct inode *inode;
455 struct v9fs_session_info *v9ses = sb->s_fs_info;
456 int (*test)(struct inode *inode, void *data);
457
458 if (new)
459 test = v9fs_test_new_inode;
460 else
461 test = v9fs_test_inode;
462
463 i_ino = v9fs_qid2ino(qid);
464 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
465 if (!inode)
466 return ERR_PTR(-ENOMEM);
467 if (!(inode->i_state & I_NEW))
468 return inode;
469 /*
470 * initialize the inode with the stat info
471 * FIXME!! we may need support for stale inodes
472 * later.
473 */
474 inode->i_ino = i_ino;
475 umode = p9mode2unixmode(v9ses, st, &rdev);
476 retval = v9fs_init_inode(v9ses, inode, umode, rdev);
477 if (retval)
478 goto error;
479
480 v9fs_stat2inode(st, inode, sb, 0);
481 v9fs_cache_inode_get_cookie(inode);
482 unlock_new_inode(inode);
483 return inode;
484error:
485 iget_failed(inode);
486 return ERR_PTR(retval);
487
488}
489
490struct inode *
491v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
492 struct super_block *sb, int new)
493{
494 struct p9_wstat *st;
495 struct inode *inode = NULL;
496
497 st = p9_client_stat(fid);
498 if (IS_ERR(st))
499 return ERR_CAST(st);
500
501 inode = v9fs_qid_iget(sb, &st->qid, st, new);
502 p9stat_free(st);
503 kfree(st);
504 return inode;
505}
506
507/**
508 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
509 * plan 9 AT flag.
510 * @flags: flags to convert
511 */
512static int v9fs_at_to_dotl_flags(int flags)
513{
514 int rflags = 0;
515
516 if (flags & AT_REMOVEDIR)
517 rflags |= P9_DOTL_AT_REMOVEDIR;
518
519 return rflags;
520}
521
522/**
523 * v9fs_dec_count - helper functon to drop i_nlink.
524 *
525 * If a directory had nlink <= 2 (including . and ..), then we should not drop
526 * the link count, which indicates the underlying exported fs doesn't maintain
527 * nlink accurately. e.g.
528 * - overlayfs sets nlink to 1 for merged dir
529 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more
530 * than EXT4_LINK_MAX (65000) links.
531 *
532 * @inode: inode whose nlink is being dropped
533 */
534static void v9fs_dec_count(struct inode *inode)
535{
536 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2)
537 drop_nlink(inode);
538}
539
540/**
541 * v9fs_remove - helper function to remove files and directories
542 * @dir: directory inode that is being deleted
543 * @dentry: dentry that is being deleted
544 * @flags: removing a directory
545 *
546 */
547
548static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
549{
550 struct inode *inode;
551 int retval = -EOPNOTSUPP;
552 struct p9_fid *v9fid, *dfid;
553 struct v9fs_session_info *v9ses;
554
555 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
556 dir, dentry, flags);
557
558 v9ses = v9fs_inode2v9ses(dir);
559 inode = d_inode(dentry);
560 dfid = v9fs_parent_fid(dentry);
561 if (IS_ERR(dfid)) {
562 retval = PTR_ERR(dfid);
563 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
564 return retval;
565 }
566 if (v9fs_proto_dotl(v9ses))
567 retval = p9_client_unlinkat(dfid, dentry->d_name.name,
568 v9fs_at_to_dotl_flags(flags));
569 p9_fid_put(dfid);
570 if (retval == -EOPNOTSUPP) {
571 /* Try the one based on path */
572 v9fid = v9fs_fid_clone(dentry);
573 if (IS_ERR(v9fid))
574 return PTR_ERR(v9fid);
575 retval = p9_client_remove(v9fid);
576 }
577 if (!retval) {
578 /*
579 * directories on unlink should have zero
580 * link count
581 */
582 if (flags & AT_REMOVEDIR) {
583 clear_nlink(inode);
584 v9fs_dec_count(dir);
585 } else
586 v9fs_dec_count(inode);
587
588 v9fs_invalidate_inode_attr(inode);
589 v9fs_invalidate_inode_attr(dir);
590
591 /* invalidate all fids associated with dentry */
592 /* NOTE: This will not include open fids */
593 dentry->d_op->d_release(dentry);
594 }
595 return retval;
596}
597
598/**
599 * v9fs_create - Create a file
600 * @v9ses: session information
601 * @dir: directory that dentry is being created in
602 * @dentry: dentry that is being created
603 * @extension: 9p2000.u extension string to support devices, etc.
604 * @perm: create permissions
605 * @mode: open mode
606 *
607 */
608static struct p9_fid *
609v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
610 struct dentry *dentry, char *extension, u32 perm, u8 mode)
611{
612 int err;
613 const unsigned char *name;
614 struct p9_fid *dfid, *ofid = NULL, *fid = NULL;
615 struct inode *inode;
616
617 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
618
619 err = 0;
620 name = dentry->d_name.name;
621 dfid = v9fs_parent_fid(dentry);
622 if (IS_ERR(dfid)) {
623 err = PTR_ERR(dfid);
624 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
625 return ERR_PTR(err);
626 }
627
628 /* clone a fid to use for creation */
629 ofid = clone_fid(dfid);
630 if (IS_ERR(ofid)) {
631 err = PTR_ERR(ofid);
632 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
633 goto error;
634 }
635
636 err = p9_client_fcreate(ofid, name, perm, mode, extension);
637 if (err < 0) {
638 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
639 goto error;
640 }
641
642 if (!(perm & P9_DMLINK)) {
643 /* now walk from the parent so we can get unopened fid */
644 fid = p9_client_walk(dfid, 1, &name, 1);
645 if (IS_ERR(fid)) {
646 err = PTR_ERR(fid);
647 p9_debug(P9_DEBUG_VFS,
648 "p9_client_walk failed %d\n", err);
649 goto error;
650 }
651 /*
652 * instantiate inode and assign the unopened fid to the dentry
653 */
654 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
655 if (IS_ERR(inode)) {
656 err = PTR_ERR(inode);
657 p9_debug(P9_DEBUG_VFS,
658 "inode creation failed %d\n", err);
659 goto error;
660 }
661 v9fs_fid_add(dentry, &fid);
662 d_instantiate(dentry, inode);
663 }
664 p9_fid_put(dfid);
665 return ofid;
666error:
667 p9_fid_put(dfid);
668 p9_fid_put(ofid);
669 p9_fid_put(fid);
670 return ERR_PTR(err);
671}
672
673/**
674 * v9fs_vfs_create - VFS hook to create a regular file
675 * @mnt_userns: The user namespace of the mount
676 * @dir: The parent directory
677 * @dentry: The name of file to be created
678 * @mode: The UNIX file mode to set
679 * @excl: True if the file must not yet exist
680 *
681 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called
682 * for mknod(2).
683 *
684 */
685
686static int
687v9fs_vfs_create(struct user_namespace *mnt_userns, struct inode *dir,
688 struct dentry *dentry, umode_t mode, bool excl)
689{
690 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
691 u32 perm = unixmode2p9mode(v9ses, mode);
692 struct p9_fid *fid;
693
694 /* P9_OEXCL? */
695 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR);
696 if (IS_ERR(fid))
697 return PTR_ERR(fid);
698
699 v9fs_invalidate_inode_attr(dir);
700 p9_fid_put(fid);
701
702 return 0;
703}
704
705/**
706 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
707 * @mnt_userns: The user namespace of the mount
708 * @dir: inode that is being unlinked
709 * @dentry: dentry that is being unlinked
710 * @mode: mode for new directory
711 *
712 */
713
714static int v9fs_vfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
715 struct dentry *dentry, umode_t mode)
716{
717 int err;
718 u32 perm;
719 struct p9_fid *fid;
720 struct v9fs_session_info *v9ses;
721
722 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
723 err = 0;
724 v9ses = v9fs_inode2v9ses(dir);
725 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
726 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
727 if (IS_ERR(fid)) {
728 err = PTR_ERR(fid);
729 fid = NULL;
730 } else {
731 inc_nlink(dir);
732 v9fs_invalidate_inode_attr(dir);
733 }
734
735 if (fid)
736 p9_fid_put(fid);
737
738 return err;
739}
740
741/**
742 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
743 * @dir: inode that is being walked from
744 * @dentry: dentry that is being walked to?
745 * @flags: lookup flags (unused)
746 *
747 */
748
749struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
750 unsigned int flags)
751{
752 struct dentry *res;
753 struct v9fs_session_info *v9ses;
754 struct p9_fid *dfid, *fid;
755 struct inode *inode;
756 const unsigned char *name;
757
758 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n",
759 dir, dentry, dentry, flags);
760
761 if (dentry->d_name.len > NAME_MAX)
762 return ERR_PTR(-ENAMETOOLONG);
763
764 v9ses = v9fs_inode2v9ses(dir);
765 /* We can walk d_parent because we hold the dir->i_mutex */
766 dfid = v9fs_parent_fid(dentry);
767 if (IS_ERR(dfid))
768 return ERR_CAST(dfid);
769
770 /*
771 * Make sure we don't use a wrong inode due to parallel
772 * unlink. For cached mode create calls request for new
773 * inode. But with cache disabled, lookup should do this.
774 */
775 name = dentry->d_name.name;
776 fid = p9_client_walk(dfid, 1, &name, 1);
777 p9_fid_put(dfid);
778 if (fid == ERR_PTR(-ENOENT))
779 inode = NULL;
780 else if (IS_ERR(fid))
781 inode = ERR_CAST(fid);
782 else if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
783 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
784 else
785 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
786 /*
787 * If we had a rename on the server and a parallel lookup
788 * for the new name, then make sure we instantiate with
789 * the new name. ie look up for a/b, while on server somebody
790 * moved b under k and client parallely did a lookup for
791 * k/b.
792 */
793 res = d_splice_alias(inode, dentry);
794 if (!IS_ERR(fid)) {
795 if (!res)
796 v9fs_fid_add(dentry, &fid);
797 else if (!IS_ERR(res))
798 v9fs_fid_add(res, &fid);
799 else
800 p9_fid_put(fid);
801 }
802 return res;
803}
804
805static int
806v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
807 struct file *file, unsigned int flags, umode_t mode)
808{
809 int err;
810 u32 perm;
811 struct v9fs_inode *v9inode;
812 struct v9fs_session_info *v9ses;
813 struct p9_fid *fid, *inode_fid;
814 struct dentry *res = NULL;
815 struct inode *inode;
816
817 if (d_in_lookup(dentry)) {
818 res = v9fs_vfs_lookup(dir, dentry, 0);
819 if (IS_ERR(res))
820 return PTR_ERR(res);
821
822 if (res)
823 dentry = res;
824 }
825
826 /* Only creates */
827 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
828 return finish_no_open(file, res);
829
830 err = 0;
831
832 v9ses = v9fs_inode2v9ses(dir);
833 perm = unixmode2p9mode(v9ses, mode);
834 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
835 v9fs_uflags2omode(flags,
836 v9fs_proto_dotu(v9ses)));
837 if (IS_ERR(fid)) {
838 err = PTR_ERR(fid);
839 goto error;
840 }
841
842 v9fs_invalidate_inode_attr(dir);
843 inode = d_inode(dentry);
844 v9inode = V9FS_I(inode);
845 mutex_lock(&v9inode->v_mutex);
846 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
847 !v9inode->writeback_fid &&
848 ((flags & O_ACCMODE) != O_RDONLY)) {
849 /*
850 * clone a fid and add it to writeback_fid
851 * we do it during open time instead of
852 * page dirty time via write_begin/page_mkwrite
853 * because we want write after unlink usecase
854 * to work.
855 */
856 inode_fid = v9fs_writeback_fid(dentry);
857 if (IS_ERR(inode_fid)) {
858 err = PTR_ERR(inode_fid);
859 mutex_unlock(&v9inode->v_mutex);
860 goto error;
861 }
862 v9inode->writeback_fid = (void *) inode_fid;
863 }
864 mutex_unlock(&v9inode->v_mutex);
865 err = finish_open(file, dentry, generic_file_open);
866 if (err)
867 goto error;
868
869 file->private_data = fid;
870 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
871 fscache_use_cookie(v9fs_inode_cookie(v9inode),
872 file->f_mode & FMODE_WRITE);
873 v9fs_open_fid_add(inode, &fid);
874
875 file->f_mode |= FMODE_CREATED;
876out:
877 dput(res);
878 return err;
879
880error:
881 p9_fid_put(fid);
882 goto out;
883}
884
885/**
886 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
887 * @i: inode that is being unlinked
888 * @d: dentry that is being unlinked
889 *
890 */
891
892int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
893{
894 return v9fs_remove(i, d, 0);
895}
896
897/**
898 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
899 * @i: inode that is being unlinked
900 * @d: dentry that is being unlinked
901 *
902 */
903
904int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
905{
906 return v9fs_remove(i, d, AT_REMOVEDIR);
907}
908
909/**
910 * v9fs_vfs_rename - VFS hook to rename an inode
911 * @mnt_userns: The user namespace of the mount
912 * @old_dir: old dir inode
913 * @old_dentry: old dentry
914 * @new_dir: new dir inode
915 * @new_dentry: new dentry
916 * @flags: RENAME_* flags
917 *
918 */
919
920int
921v9fs_vfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
922 struct dentry *old_dentry, struct inode *new_dir,
923 struct dentry *new_dentry, unsigned int flags)
924{
925 int retval;
926 struct inode *old_inode;
927 struct inode *new_inode;
928 struct v9fs_session_info *v9ses;
929 struct p9_fid *oldfid = NULL, *dfid = NULL;
930 struct p9_fid *olddirfid = NULL;
931 struct p9_fid *newdirfid = NULL;
932 struct p9_wstat wstat;
933
934 if (flags)
935 return -EINVAL;
936
937 p9_debug(P9_DEBUG_VFS, "\n");
938 retval = 0;
939 old_inode = d_inode(old_dentry);
940 new_inode = d_inode(new_dentry);
941 v9ses = v9fs_inode2v9ses(old_inode);
942 oldfid = v9fs_fid_lookup(old_dentry);
943 if (IS_ERR(oldfid))
944 return PTR_ERR(oldfid);
945
946 dfid = v9fs_parent_fid(old_dentry);
947 olddirfid = clone_fid(dfid);
948 p9_fid_put(dfid);
949 dfid = NULL;
950
951 if (IS_ERR(olddirfid)) {
952 retval = PTR_ERR(olddirfid);
953 goto error;
954 }
955
956 dfid = v9fs_parent_fid(new_dentry);
957 newdirfid = clone_fid(dfid);
958 p9_fid_put(dfid);
959 dfid = NULL;
960
961 if (IS_ERR(newdirfid)) {
962 retval = PTR_ERR(newdirfid);
963 goto error;
964 }
965
966 down_write(&v9ses->rename_sem);
967 if (v9fs_proto_dotl(v9ses)) {
968 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
969 newdirfid, new_dentry->d_name.name);
970 if (retval == -EOPNOTSUPP)
971 retval = p9_client_rename(oldfid, newdirfid,
972 new_dentry->d_name.name);
973 if (retval != -EOPNOTSUPP)
974 goto error_locked;
975 }
976 if (old_dentry->d_parent != new_dentry->d_parent) {
977 /*
978 * 9P .u can only handle file rename in the same directory
979 */
980
981 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
982 retval = -EXDEV;
983 goto error_locked;
984 }
985 v9fs_blank_wstat(&wstat);
986 wstat.muid = v9ses->uname;
987 wstat.name = new_dentry->d_name.name;
988 retval = p9_client_wstat(oldfid, &wstat);
989
990error_locked:
991 if (!retval) {
992 if (new_inode) {
993 if (S_ISDIR(new_inode->i_mode))
994 clear_nlink(new_inode);
995 else
996 v9fs_dec_count(new_inode);
997 }
998 if (S_ISDIR(old_inode->i_mode)) {
999 if (!new_inode)
1000 inc_nlink(new_dir);
1001 v9fs_dec_count(old_dir);
1002 }
1003 v9fs_invalidate_inode_attr(old_inode);
1004 v9fs_invalidate_inode_attr(old_dir);
1005 v9fs_invalidate_inode_attr(new_dir);
1006
1007 /* successful rename */
1008 d_move(old_dentry, new_dentry);
1009 }
1010 up_write(&v9ses->rename_sem);
1011
1012error:
1013 p9_fid_put(newdirfid);
1014 p9_fid_put(olddirfid);
1015 p9_fid_put(oldfid);
1016 return retval;
1017}
1018
1019/**
1020 * v9fs_vfs_getattr - retrieve file metadata
1021 * @mnt_userns: The user namespace of the mount
1022 * @path: Object to query
1023 * @stat: metadata structure to populate
1024 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
1025 * @flags: AT_STATX_xxx setting
1026 *
1027 */
1028
1029static int
1030v9fs_vfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
1031 struct kstat *stat, u32 request_mask, unsigned int flags)
1032{
1033 struct dentry *dentry = path->dentry;
1034 struct v9fs_session_info *v9ses;
1035 struct p9_fid *fid;
1036 struct p9_wstat *st;
1037
1038 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1039 v9ses = v9fs_dentry2v9ses(dentry);
1040 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1041 generic_fillattr(&init_user_ns, d_inode(dentry), stat);
1042 return 0;
1043 }
1044 fid = v9fs_fid_lookup(dentry);
1045 if (IS_ERR(fid))
1046 return PTR_ERR(fid);
1047
1048 st = p9_client_stat(fid);
1049 p9_fid_put(fid);
1050 if (IS_ERR(st))
1051 return PTR_ERR(st);
1052
1053 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0);
1054 generic_fillattr(&init_user_ns, d_inode(dentry), stat);
1055
1056 p9stat_free(st);
1057 kfree(st);
1058 return 0;
1059}
1060
1061/**
1062 * v9fs_vfs_setattr - set file metadata
1063 * @mnt_userns: The user namespace of the mount
1064 * @dentry: file whose metadata to set
1065 * @iattr: metadata assignment structure
1066 *
1067 */
1068
1069static int v9fs_vfs_setattr(struct user_namespace *mnt_userns,
1070 struct dentry *dentry, struct iattr *iattr)
1071{
1072 int retval, use_dentry = 0;
1073 struct inode *inode = d_inode(dentry);
1074 struct v9fs_inode *v9inode = V9FS_I(inode);
1075 struct v9fs_session_info *v9ses;
1076 struct p9_fid *fid = NULL;
1077 struct p9_wstat wstat;
1078
1079 p9_debug(P9_DEBUG_VFS, "\n");
1080 retval = setattr_prepare(&init_user_ns, dentry, iattr);
1081 if (retval)
1082 return retval;
1083
1084 retval = -EPERM;
1085 v9ses = v9fs_dentry2v9ses(dentry);
1086 if (iattr->ia_valid & ATTR_FILE) {
1087 fid = iattr->ia_file->private_data;
1088 WARN_ON(!fid);
1089 }
1090 if (!fid) {
1091 fid = v9fs_fid_lookup(dentry);
1092 use_dentry = 1;
1093 }
1094 if (IS_ERR(fid))
1095 return PTR_ERR(fid);
1096
1097 v9fs_blank_wstat(&wstat);
1098 if (iattr->ia_valid & ATTR_MODE)
1099 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1100
1101 if (iattr->ia_valid & ATTR_MTIME)
1102 wstat.mtime = iattr->ia_mtime.tv_sec;
1103
1104 if (iattr->ia_valid & ATTR_ATIME)
1105 wstat.atime = iattr->ia_atime.tv_sec;
1106
1107 if (iattr->ia_valid & ATTR_SIZE)
1108 wstat.length = iattr->ia_size;
1109
1110 if (v9fs_proto_dotu(v9ses)) {
1111 if (iattr->ia_valid & ATTR_UID)
1112 wstat.n_uid = iattr->ia_uid;
1113
1114 if (iattr->ia_valid & ATTR_GID)
1115 wstat.n_gid = iattr->ia_gid;
1116 }
1117
1118 /* Write all dirty data */
1119 if (d_is_reg(dentry))
1120 filemap_write_and_wait(inode->i_mapping);
1121
1122 retval = p9_client_wstat(fid, &wstat);
1123
1124 if (use_dentry)
1125 p9_fid_put(fid);
1126
1127 if (retval < 0)
1128 return retval;
1129
1130 if ((iattr->ia_valid & ATTR_SIZE) &&
1131 iattr->ia_size != i_size_read(inode)) {
1132 truncate_setsize(inode, iattr->ia_size);
1133 fscache_resize_cookie(v9fs_inode_cookie(v9inode), iattr->ia_size);
1134 }
1135
1136 v9fs_invalidate_inode_attr(inode);
1137
1138 setattr_copy(&init_user_ns, inode, iattr);
1139 mark_inode_dirty(inode);
1140 return 0;
1141}
1142
1143/**
1144 * v9fs_stat2inode - populate an inode structure with mistat info
1145 * @stat: Plan 9 metadata (mistat) structure
1146 * @inode: inode to populate
1147 * @sb: superblock of filesystem
1148 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
1149 *
1150 */
1151
1152void
1153v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1154 struct super_block *sb, unsigned int flags)
1155{
1156 umode_t mode;
1157 struct v9fs_session_info *v9ses = sb->s_fs_info;
1158 struct v9fs_inode *v9inode = V9FS_I(inode);
1159
1160 set_nlink(inode, 1);
1161
1162 inode->i_atime.tv_sec = stat->atime;
1163 inode->i_mtime.tv_sec = stat->mtime;
1164 inode->i_ctime.tv_sec = stat->mtime;
1165
1166 inode->i_uid = v9ses->dfltuid;
1167 inode->i_gid = v9ses->dfltgid;
1168
1169 if (v9fs_proto_dotu(v9ses)) {
1170 inode->i_uid = stat->n_uid;
1171 inode->i_gid = stat->n_gid;
1172 }
1173 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1174 if (v9fs_proto_dotu(v9ses)) {
1175 unsigned int i_nlink;
1176 /*
1177 * Hadlink support got added later to the .u extension.
1178 * So there can be a server out there that doesn't
1179 * support this even with .u extension. That would
1180 * just leave us with stat->extension being an empty
1181 * string, though.
1182 */
1183 /* HARDLINKCOUNT %u */
1184 if (sscanf(stat->extension,
1185 " HARDLINKCOUNT %u", &i_nlink) == 1)
1186 set_nlink(inode, i_nlink);
1187 }
1188 }
1189 mode = p9mode2perm(v9ses, stat);
1190 mode |= inode->i_mode & ~S_IALLUGO;
1191 inode->i_mode = mode;
1192
1193 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
1194 v9fs_i_size_write(inode, stat->length);
1195 /* not real number of blocks, but 512 byte ones ... */
1196 inode->i_blocks = (stat->length + 512 - 1) >> 9;
1197 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1198}
1199
1200/**
1201 * v9fs_qid2ino - convert qid into inode number
1202 * @qid: qid to hash
1203 *
1204 * BUG: potential for inode number collisions?
1205 */
1206
1207ino_t v9fs_qid2ino(struct p9_qid *qid)
1208{
1209 u64 path = qid->path + 2;
1210 ino_t i = 0;
1211
1212 if (sizeof(ino_t) == sizeof(path))
1213 memcpy(&i, &path, sizeof(ino_t));
1214 else
1215 i = (ino_t) (path ^ (path >> 32));
1216
1217 return i;
1218}
1219
1220/**
1221 * v9fs_vfs_get_link - follow a symlink path
1222 * @dentry: dentry for symlink
1223 * @inode: inode for symlink
1224 * @done: delayed call for when we are done with the return value
1225 */
1226
1227static const char *v9fs_vfs_get_link(struct dentry *dentry,
1228 struct inode *inode,
1229 struct delayed_call *done)
1230{
1231 struct v9fs_session_info *v9ses;
1232 struct p9_fid *fid;
1233 struct p9_wstat *st;
1234 char *res;
1235
1236 if (!dentry)
1237 return ERR_PTR(-ECHILD);
1238
1239 v9ses = v9fs_dentry2v9ses(dentry);
1240 if (!v9fs_proto_dotu(v9ses))
1241 return ERR_PTR(-EBADF);
1242
1243 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
1244 fid = v9fs_fid_lookup(dentry);
1245
1246 if (IS_ERR(fid))
1247 return ERR_CAST(fid);
1248
1249 st = p9_client_stat(fid);
1250 p9_fid_put(fid);
1251 if (IS_ERR(st))
1252 return ERR_CAST(st);
1253
1254 if (!(st->mode & P9_DMSYMLINK)) {
1255 p9stat_free(st);
1256 kfree(st);
1257 return ERR_PTR(-EINVAL);
1258 }
1259 res = st->extension;
1260 st->extension = NULL;
1261 if (strlen(res) >= PATH_MAX)
1262 res[PATH_MAX - 1] = '\0';
1263
1264 p9stat_free(st);
1265 kfree(st);
1266 set_delayed_call(done, kfree_link, res);
1267 return res;
1268}
1269
1270/**
1271 * v9fs_vfs_mkspecial - create a special file
1272 * @dir: inode to create special file in
1273 * @dentry: dentry to create
1274 * @perm: mode to create special file
1275 * @extension: 9p2000.u format extension string representing special file
1276 *
1277 */
1278
1279static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1280 u32 perm, const char *extension)
1281{
1282 struct p9_fid *fid;
1283 struct v9fs_session_info *v9ses;
1284
1285 v9ses = v9fs_inode2v9ses(dir);
1286 if (!v9fs_proto_dotu(v9ses)) {
1287 p9_debug(P9_DEBUG_ERROR, "not extended\n");
1288 return -EPERM;
1289 }
1290
1291 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1292 P9_OREAD);
1293 if (IS_ERR(fid))
1294 return PTR_ERR(fid);
1295
1296 v9fs_invalidate_inode_attr(dir);
1297 p9_fid_put(fid);
1298 return 0;
1299}
1300
1301/**
1302 * v9fs_vfs_symlink - helper function to create symlinks
1303 * @mnt_userns: The user namespace of the mount
1304 * @dir: directory inode containing symlink
1305 * @dentry: dentry for symlink
1306 * @symname: symlink data
1307 *
1308 * See Also: 9P2000.u RFC for more information
1309 *
1310 */
1311
1312static int
1313v9fs_vfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
1314 struct dentry *dentry, const char *symname)
1315{
1316 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n",
1317 dir->i_ino, dentry, symname);
1318
1319 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname);
1320}
1321
1322#define U32_MAX_DIGITS 10
1323
1324/**
1325 * v9fs_vfs_link - create a hardlink
1326 * @old_dentry: dentry for file to link to
1327 * @dir: inode destination for new link
1328 * @dentry: dentry for link
1329 *
1330 */
1331
1332static int
1333v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1334 struct dentry *dentry)
1335{
1336 int retval;
1337 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */
1338 struct p9_fid *oldfid;
1339
1340 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n",
1341 dir->i_ino, dentry, old_dentry);
1342
1343 oldfid = v9fs_fid_clone(old_dentry);
1344 if (IS_ERR(oldfid))
1345 return PTR_ERR(oldfid);
1346
1347 sprintf(name, "%d\n", oldfid->fid);
1348 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1349 if (!retval) {
1350 v9fs_refresh_inode(oldfid, d_inode(old_dentry));
1351 v9fs_invalidate_inode_attr(dir);
1352 }
1353 p9_fid_put(oldfid);
1354 return retval;
1355}
1356
1357/**
1358 * v9fs_vfs_mknod - create a special file
1359 * @mnt_userns: The user namespace of the mount
1360 * @dir: inode destination for new link
1361 * @dentry: dentry for file
1362 * @mode: mode for creation
1363 * @rdev: device associated with special file
1364 *
1365 */
1366
1367static int
1368v9fs_vfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
1369 struct dentry *dentry, umode_t mode, dev_t rdev)
1370{
1371 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1372 int retval;
1373 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1];
1374 u32 perm;
1375
1376 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
1377 dir->i_ino, dentry, mode,
1378 MAJOR(rdev), MINOR(rdev));
1379
1380 /* build extension */
1381 if (S_ISBLK(mode))
1382 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1383 else if (S_ISCHR(mode))
1384 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1385 else
1386 *name = 0;
1387
1388 perm = unixmode2p9mode(v9ses, mode);
1389 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name);
1390
1391 return retval;
1392}
1393
1394int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1395{
1396 int umode;
1397 dev_t rdev;
1398 struct p9_wstat *st;
1399 struct v9fs_session_info *v9ses;
1400 unsigned int flags;
1401
1402 v9ses = v9fs_inode2v9ses(inode);
1403 st = p9_client_stat(fid);
1404 if (IS_ERR(st))
1405 return PTR_ERR(st);
1406 /*
1407 * Don't update inode if the file type is different
1408 */
1409 umode = p9mode2unixmode(v9ses, st, &rdev);
1410 if (inode_wrong_type(inode, umode))
1411 goto out;
1412
1413 /*
1414 * We don't want to refresh inode->i_size,
1415 * because we may have cached data
1416 */
1417 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
1418 V9FS_STAT2INODE_KEEP_ISIZE : 0;
1419 v9fs_stat2inode(st, inode, inode->i_sb, flags);
1420out:
1421 p9stat_free(st);
1422 kfree(st);
1423 return 0;
1424}
1425
1426static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1427 .create = v9fs_vfs_create,
1428 .lookup = v9fs_vfs_lookup,
1429 .atomic_open = v9fs_vfs_atomic_open,
1430 .symlink = v9fs_vfs_symlink,
1431 .link = v9fs_vfs_link,
1432 .unlink = v9fs_vfs_unlink,
1433 .mkdir = v9fs_vfs_mkdir,
1434 .rmdir = v9fs_vfs_rmdir,
1435 .mknod = v9fs_vfs_mknod,
1436 .rename = v9fs_vfs_rename,
1437 .getattr = v9fs_vfs_getattr,
1438 .setattr = v9fs_vfs_setattr,
1439};
1440
1441static const struct inode_operations v9fs_dir_inode_operations = {
1442 .create = v9fs_vfs_create,
1443 .lookup = v9fs_vfs_lookup,
1444 .atomic_open = v9fs_vfs_atomic_open,
1445 .unlink = v9fs_vfs_unlink,
1446 .mkdir = v9fs_vfs_mkdir,
1447 .rmdir = v9fs_vfs_rmdir,
1448 .mknod = v9fs_vfs_mknod,
1449 .rename = v9fs_vfs_rename,
1450 .getattr = v9fs_vfs_getattr,
1451 .setattr = v9fs_vfs_setattr,
1452};
1453
1454static const struct inode_operations v9fs_file_inode_operations = {
1455 .getattr = v9fs_vfs_getattr,
1456 .setattr = v9fs_vfs_setattr,
1457};
1458
1459static const struct inode_operations v9fs_symlink_inode_operations = {
1460 .get_link = v9fs_vfs_get_link,
1461 .getattr = v9fs_vfs_getattr,
1462 .setattr = v9fs_vfs_setattr,
1463};
1464
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * This file contains vfs inode ops for the 9P2000 protocol.
4 *
5 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
6 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
7 */
8
9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <linux/module.h>
12#include <linux/errno.h>
13#include <linux/fs.h>
14#include <linux/file.h>
15#include <linux/pagemap.h>
16#include <linux/stat.h>
17#include <linux/string.h>
18#include <linux/namei.h>
19#include <linux/sched.h>
20#include <linux/slab.h>
21#include <linux/xattr.h>
22#include <linux/posix_acl.h>
23#include <net/9p/9p.h>
24#include <net/9p/client.h>
25
26#include "v9fs.h"
27#include "v9fs_vfs.h"
28#include "fid.h"
29#include "cache.h"
30#include "xattr.h"
31#include "acl.h"
32
33static const struct inode_operations v9fs_dir_inode_operations;
34static const struct inode_operations v9fs_dir_inode_operations_dotu;
35static const struct inode_operations v9fs_file_inode_operations;
36static const struct inode_operations v9fs_symlink_inode_operations;
37
38/**
39 * unixmode2p9mode - convert unix mode bits to plan 9
40 * @v9ses: v9fs session information
41 * @mode: mode to convert
42 *
43 */
44
45static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode)
46{
47 int res;
48
49 res = mode & 0777;
50 if (S_ISDIR(mode))
51 res |= P9_DMDIR;
52 if (v9fs_proto_dotu(v9ses)) {
53 if (v9ses->nodev == 0) {
54 if (S_ISSOCK(mode))
55 res |= P9_DMSOCKET;
56 if (S_ISFIFO(mode))
57 res |= P9_DMNAMEDPIPE;
58 if (S_ISBLK(mode))
59 res |= P9_DMDEVICE;
60 if (S_ISCHR(mode))
61 res |= P9_DMDEVICE;
62 }
63
64 if ((mode & S_ISUID) == S_ISUID)
65 res |= P9_DMSETUID;
66 if ((mode & S_ISGID) == S_ISGID)
67 res |= P9_DMSETGID;
68 if ((mode & S_ISVTX) == S_ISVTX)
69 res |= P9_DMSETVTX;
70 }
71 return res;
72}
73
74/**
75 * p9mode2perm- convert plan9 mode bits to unix permission bits
76 * @v9ses: v9fs session information
77 * @stat: p9_wstat from which mode need to be derived
78 *
79 */
80static int p9mode2perm(struct v9fs_session_info *v9ses,
81 struct p9_wstat *stat)
82{
83 int res;
84 int mode = stat->mode;
85
86 res = mode & 0777; /* S_IRWXUGO */
87 if (v9fs_proto_dotu(v9ses)) {
88 if ((mode & P9_DMSETUID) == P9_DMSETUID)
89 res |= S_ISUID;
90
91 if ((mode & P9_DMSETGID) == P9_DMSETGID)
92 res |= S_ISGID;
93
94 if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
95 res |= S_ISVTX;
96 }
97 return res;
98}
99
100/**
101 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
102 * @v9ses: v9fs session information
103 * @stat: p9_wstat from which mode need to be derived
104 * @rdev: major number, minor number in case of device files.
105 *
106 */
107static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses,
108 struct p9_wstat *stat, dev_t *rdev)
109{
110 int res, r;
111 u32 mode = stat->mode;
112
113 *rdev = 0;
114 res = p9mode2perm(v9ses, stat);
115
116 if ((mode & P9_DMDIR) == P9_DMDIR)
117 res |= S_IFDIR;
118 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
119 res |= S_IFLNK;
120 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
121 && (v9ses->nodev == 0))
122 res |= S_IFSOCK;
123 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
124 && (v9ses->nodev == 0))
125 res |= S_IFIFO;
126 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
127 && (v9ses->nodev == 0)) {
128 char type = 0;
129 int major = -1, minor = -1;
130
131 r = sscanf(stat->extension, "%c %i %i", &type, &major, &minor);
132 if (r != 3) {
133 p9_debug(P9_DEBUG_ERROR,
134 "invalid device string, umode will be bogus: %s\n",
135 stat->extension);
136 return res;
137 }
138 switch (type) {
139 case 'c':
140 res |= S_IFCHR;
141 break;
142 case 'b':
143 res |= S_IFBLK;
144 break;
145 default:
146 p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n",
147 type, stat->extension);
148 }
149 *rdev = MKDEV(major, minor);
150 } else
151 res |= S_IFREG;
152
153 return res;
154}
155
156/**
157 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
158 * @uflags: flags to convert
159 * @extended: if .u extensions are active
160 */
161
162int v9fs_uflags2omode(int uflags, int extended)
163{
164 int ret;
165
166 switch (uflags&3) {
167 default:
168 case O_RDONLY:
169 ret = P9_OREAD;
170 break;
171
172 case O_WRONLY:
173 ret = P9_OWRITE;
174 break;
175
176 case O_RDWR:
177 ret = P9_ORDWR;
178 break;
179 }
180
181 if (uflags & O_TRUNC)
182 ret |= P9_OTRUNC;
183
184 if (extended) {
185 if (uflags & O_EXCL)
186 ret |= P9_OEXCL;
187
188 if (uflags & O_APPEND)
189 ret |= P9_OAPPEND;
190 }
191
192 return ret;
193}
194
195/**
196 * v9fs_blank_wstat - helper function to setup a 9P stat structure
197 * @wstat: structure to initialize
198 *
199 */
200
201void
202v9fs_blank_wstat(struct p9_wstat *wstat)
203{
204 wstat->type = ~0;
205 wstat->dev = ~0;
206 wstat->qid.type = ~0;
207 wstat->qid.version = ~0;
208 *((long long *)&wstat->qid.path) = ~0;
209 wstat->mode = ~0;
210 wstat->atime = ~0;
211 wstat->mtime = ~0;
212 wstat->length = ~0;
213 wstat->name = NULL;
214 wstat->uid = NULL;
215 wstat->gid = NULL;
216 wstat->muid = NULL;
217 wstat->n_uid = INVALID_UID;
218 wstat->n_gid = INVALID_GID;
219 wstat->n_muid = INVALID_UID;
220 wstat->extension = NULL;
221}
222
223/**
224 * v9fs_alloc_inode - helper function to allocate an inode
225 * @sb: The superblock to allocate the inode from
226 */
227struct inode *v9fs_alloc_inode(struct super_block *sb)
228{
229 struct v9fs_inode *v9inode;
230
231 v9inode = alloc_inode_sb(sb, v9fs_inode_cache, GFP_KERNEL);
232 if (!v9inode)
233 return NULL;
234 v9inode->cache_validity = 0;
235 mutex_init(&v9inode->v_mutex);
236 return &v9inode->netfs.inode;
237}
238
239/**
240 * v9fs_free_inode - destroy an inode
241 * @inode: The inode to be freed
242 */
243
244void v9fs_free_inode(struct inode *inode)
245{
246 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
247}
248
249/*
250 * Set parameters for the netfs library
251 */
252void v9fs_set_netfs_context(struct inode *inode)
253{
254 struct v9fs_inode *v9inode = V9FS_I(inode);
255 netfs_inode_init(&v9inode->netfs, &v9fs_req_ops, true);
256}
257
258int v9fs_init_inode(struct v9fs_session_info *v9ses,
259 struct inode *inode, struct p9_qid *qid, umode_t mode, dev_t rdev)
260{
261 int err = 0;
262 struct v9fs_inode *v9inode = V9FS_I(inode);
263
264 memcpy(&v9inode->qid, qid, sizeof(struct p9_qid));
265
266 inode_init_owner(&nop_mnt_idmap, inode, NULL, mode);
267 inode->i_blocks = 0;
268 inode->i_rdev = rdev;
269 simple_inode_init_ts(inode);
270 inode->i_mapping->a_ops = &v9fs_addr_operations;
271 inode->i_private = NULL;
272
273 switch (mode & S_IFMT) {
274 case S_IFIFO:
275 case S_IFBLK:
276 case S_IFCHR:
277 case S_IFSOCK:
278 if (v9fs_proto_dotl(v9ses)) {
279 inode->i_op = &v9fs_file_inode_operations_dotl;
280 } else if (v9fs_proto_dotu(v9ses)) {
281 inode->i_op = &v9fs_file_inode_operations;
282 } else {
283 p9_debug(P9_DEBUG_ERROR,
284 "special files without extended mode\n");
285 err = -EINVAL;
286 goto error;
287 }
288 init_special_inode(inode, inode->i_mode, inode->i_rdev);
289 break;
290 case S_IFREG:
291 if (v9fs_proto_dotl(v9ses)) {
292 inode->i_op = &v9fs_file_inode_operations_dotl;
293 inode->i_fop = &v9fs_file_operations_dotl;
294 } else {
295 inode->i_op = &v9fs_file_inode_operations;
296 inode->i_fop = &v9fs_file_operations;
297 }
298
299 break;
300 case S_IFLNK:
301 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
302 p9_debug(P9_DEBUG_ERROR,
303 "extended modes used with legacy protocol\n");
304 err = -EINVAL;
305 goto error;
306 }
307
308 if (v9fs_proto_dotl(v9ses))
309 inode->i_op = &v9fs_symlink_inode_operations_dotl;
310 else
311 inode->i_op = &v9fs_symlink_inode_operations;
312
313 break;
314 case S_IFDIR:
315 inc_nlink(inode);
316 if (v9fs_proto_dotl(v9ses))
317 inode->i_op = &v9fs_dir_inode_operations_dotl;
318 else if (v9fs_proto_dotu(v9ses))
319 inode->i_op = &v9fs_dir_inode_operations_dotu;
320 else
321 inode->i_op = &v9fs_dir_inode_operations;
322
323 if (v9fs_proto_dotl(v9ses))
324 inode->i_fop = &v9fs_dir_operations_dotl;
325 else
326 inode->i_fop = &v9fs_dir_operations;
327
328 break;
329 default:
330 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n",
331 mode, mode & S_IFMT);
332 err = -EINVAL;
333 goto error;
334 }
335error:
336 return err;
337
338}
339
340/**
341 * v9fs_evict_inode - Remove an inode from the inode cache
342 * @inode: inode to release
343 *
344 */
345void v9fs_evict_inode(struct inode *inode)
346{
347 struct v9fs_inode __maybe_unused *v9inode = V9FS_I(inode);
348 __le32 __maybe_unused version;
349
350 if (!is_bad_inode(inode)) {
351 truncate_inode_pages_final(&inode->i_data);
352
353 version = cpu_to_le32(v9inode->qid.version);
354 netfs_clear_inode_writeback(inode, &version);
355
356 clear_inode(inode);
357 filemap_fdatawrite(&inode->i_data);
358
359#ifdef CONFIG_9P_FSCACHE
360 if (v9fs_inode_cookie(v9inode))
361 fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false);
362#endif
363 } else
364 clear_inode(inode);
365}
366
367struct inode *
368v9fs_fid_iget(struct super_block *sb, struct p9_fid *fid, bool new)
369{
370 dev_t rdev;
371 int retval;
372 umode_t umode;
373 struct inode *inode;
374 struct p9_wstat *st;
375 struct v9fs_session_info *v9ses = sb->s_fs_info;
376
377 inode = iget_locked(sb, QID2INO(&fid->qid));
378 if (unlikely(!inode))
379 return ERR_PTR(-ENOMEM);
380 if (!(inode->i_state & I_NEW)) {
381 if (!new) {
382 goto done;
383 } else {
384 p9_debug(P9_DEBUG_VFS, "WARNING: Inode collision %ld\n",
385 inode->i_ino);
386 iput(inode);
387 remove_inode_hash(inode);
388 inode = iget_locked(sb, QID2INO(&fid->qid));
389 WARN_ON(!(inode->i_state & I_NEW));
390 }
391 }
392
393 /*
394 * initialize the inode with the stat info
395 * FIXME!! we may need support for stale inodes
396 * later.
397 */
398 st = p9_client_stat(fid);
399 if (IS_ERR(st)) {
400 retval = PTR_ERR(st);
401 goto error;
402 }
403
404 umode = p9mode2unixmode(v9ses, st, &rdev);
405 retval = v9fs_init_inode(v9ses, inode, &fid->qid, umode, rdev);
406 v9fs_stat2inode(st, inode, sb, 0);
407 p9stat_free(st);
408 kfree(st);
409 if (retval)
410 goto error;
411
412 v9fs_set_netfs_context(inode);
413 v9fs_cache_inode_get_cookie(inode);
414 unlock_new_inode(inode);
415done:
416 return inode;
417error:
418 iget_failed(inode);
419 return ERR_PTR(retval);
420}
421
422/**
423 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
424 * plan 9 AT flag.
425 * @flags: flags to convert
426 */
427static int v9fs_at_to_dotl_flags(int flags)
428{
429 int rflags = 0;
430
431 if (flags & AT_REMOVEDIR)
432 rflags |= P9_DOTL_AT_REMOVEDIR;
433
434 return rflags;
435}
436
437/**
438 * v9fs_dec_count - helper functon to drop i_nlink.
439 *
440 * If a directory had nlink <= 2 (including . and ..), then we should not drop
441 * the link count, which indicates the underlying exported fs doesn't maintain
442 * nlink accurately. e.g.
443 * - overlayfs sets nlink to 1 for merged dir
444 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more
445 * than EXT4_LINK_MAX (65000) links.
446 *
447 * @inode: inode whose nlink is being dropped
448 */
449static void v9fs_dec_count(struct inode *inode)
450{
451 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) {
452 if (inode->i_nlink) {
453 drop_nlink(inode);
454 } else {
455 p9_debug(P9_DEBUG_VFS,
456 "WARNING: unexpected i_nlink zero %d inode %ld\n",
457 inode->i_nlink, inode->i_ino);
458 }
459 }
460}
461
462/**
463 * v9fs_remove - helper function to remove files and directories
464 * @dir: directory inode that is being deleted
465 * @dentry: dentry that is being deleted
466 * @flags: removing a directory
467 *
468 */
469
470static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
471{
472 struct inode *inode;
473 int retval = -EOPNOTSUPP;
474 struct p9_fid *v9fid, *dfid;
475 struct v9fs_session_info *v9ses;
476
477 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
478 dir, dentry, flags);
479
480 v9ses = v9fs_inode2v9ses(dir);
481 inode = d_inode(dentry);
482 dfid = v9fs_parent_fid(dentry);
483 if (IS_ERR(dfid)) {
484 retval = PTR_ERR(dfid);
485 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
486 return retval;
487 }
488 if (v9fs_proto_dotl(v9ses))
489 retval = p9_client_unlinkat(dfid, dentry->d_name.name,
490 v9fs_at_to_dotl_flags(flags));
491 p9_fid_put(dfid);
492 if (retval == -EOPNOTSUPP) {
493 /* Try the one based on path */
494 v9fid = v9fs_fid_clone(dentry);
495 if (IS_ERR(v9fid))
496 return PTR_ERR(v9fid);
497 retval = p9_client_remove(v9fid);
498 }
499 if (!retval) {
500 /*
501 * directories on unlink should have zero
502 * link count
503 */
504 if (flags & AT_REMOVEDIR) {
505 clear_nlink(inode);
506 v9fs_dec_count(dir);
507 } else
508 v9fs_dec_count(inode);
509
510 if (inode->i_nlink <= 0) /* no more refs unhash it */
511 remove_inode_hash(inode);
512
513 v9fs_invalidate_inode_attr(inode);
514 v9fs_invalidate_inode_attr(dir);
515
516 /* invalidate all fids associated with dentry */
517 /* NOTE: This will not include open fids */
518 dentry->d_op->d_release(dentry);
519 }
520 return retval;
521}
522
523/**
524 * v9fs_create - Create a file
525 * @v9ses: session information
526 * @dir: directory that dentry is being created in
527 * @dentry: dentry that is being created
528 * @extension: 9p2000.u extension string to support devices, etc.
529 * @perm: create permissions
530 * @mode: open mode
531 *
532 */
533static struct p9_fid *
534v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
535 struct dentry *dentry, char *extension, u32 perm, u8 mode)
536{
537 int err;
538 const unsigned char *name;
539 struct p9_fid *dfid, *ofid = NULL, *fid = NULL;
540 struct inode *inode;
541
542 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
543
544 name = dentry->d_name.name;
545 dfid = v9fs_parent_fid(dentry);
546 if (IS_ERR(dfid)) {
547 err = PTR_ERR(dfid);
548 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
549 return ERR_PTR(err);
550 }
551
552 /* clone a fid to use for creation */
553 ofid = clone_fid(dfid);
554 if (IS_ERR(ofid)) {
555 err = PTR_ERR(ofid);
556 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
557 goto error;
558 }
559
560 err = p9_client_fcreate(ofid, name, perm, mode, extension);
561 if (err < 0) {
562 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
563 goto error;
564 }
565
566 if (!(perm & P9_DMLINK)) {
567 /* now walk from the parent so we can get unopened fid */
568 fid = p9_client_walk(dfid, 1, &name, 1);
569 if (IS_ERR(fid)) {
570 err = PTR_ERR(fid);
571 p9_debug(P9_DEBUG_VFS,
572 "p9_client_walk failed %d\n", err);
573 goto error;
574 }
575 /*
576 * instantiate inode and assign the unopened fid to the dentry
577 */
578 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb, true);
579 if (IS_ERR(inode)) {
580 err = PTR_ERR(inode);
581 p9_debug(P9_DEBUG_VFS,
582 "inode creation failed %d\n", err);
583 goto error;
584 }
585 v9fs_fid_add(dentry, &fid);
586 d_instantiate(dentry, inode);
587 }
588 p9_fid_put(dfid);
589 return ofid;
590error:
591 p9_fid_put(dfid);
592 p9_fid_put(ofid);
593 p9_fid_put(fid);
594 return ERR_PTR(err);
595}
596
597/**
598 * v9fs_vfs_create - VFS hook to create a regular file
599 * @idmap: idmap of the mount
600 * @dir: The parent directory
601 * @dentry: The name of file to be created
602 * @mode: The UNIX file mode to set
603 * @excl: True if the file must not yet exist
604 *
605 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called
606 * for mknod(2).
607 *
608 */
609
610static int
611v9fs_vfs_create(struct mnt_idmap *idmap, struct inode *dir,
612 struct dentry *dentry, umode_t mode, bool excl)
613{
614 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
615 u32 perm = unixmode2p9mode(v9ses, mode);
616 struct p9_fid *fid;
617
618 /* P9_OEXCL? */
619 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR);
620 if (IS_ERR(fid))
621 return PTR_ERR(fid);
622
623 v9fs_invalidate_inode_attr(dir);
624 p9_fid_put(fid);
625
626 return 0;
627}
628
629/**
630 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
631 * @idmap: idmap of the mount
632 * @dir: inode that is being unlinked
633 * @dentry: dentry that is being unlinked
634 * @mode: mode for new directory
635 *
636 */
637
638static int v9fs_vfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
639 struct dentry *dentry, umode_t mode)
640{
641 int err;
642 u32 perm;
643 struct p9_fid *fid;
644 struct v9fs_session_info *v9ses;
645
646 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
647 err = 0;
648 v9ses = v9fs_inode2v9ses(dir);
649 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
650 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
651 if (IS_ERR(fid)) {
652 err = PTR_ERR(fid);
653 fid = NULL;
654 } else {
655 inc_nlink(dir);
656 v9fs_invalidate_inode_attr(dir);
657 }
658
659 if (fid)
660 p9_fid_put(fid);
661
662 return err;
663}
664
665/**
666 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
667 * @dir: inode that is being walked from
668 * @dentry: dentry that is being walked to?
669 * @flags: lookup flags (unused)
670 *
671 */
672
673struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
674 unsigned int flags)
675{
676 struct dentry *res;
677 struct v9fs_session_info *v9ses;
678 struct p9_fid *dfid, *fid;
679 struct inode *inode;
680 const unsigned char *name;
681
682 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n",
683 dir, dentry, dentry, flags);
684
685 if (dentry->d_name.len > NAME_MAX)
686 return ERR_PTR(-ENAMETOOLONG);
687
688 v9ses = v9fs_inode2v9ses(dir);
689 /* We can walk d_parent because we hold the dir->i_mutex */
690 dfid = v9fs_parent_fid(dentry);
691 if (IS_ERR(dfid))
692 return ERR_CAST(dfid);
693
694 /*
695 * Make sure we don't use a wrong inode due to parallel
696 * unlink. For cached mode create calls request for new
697 * inode. But with cache disabled, lookup should do this.
698 */
699 name = dentry->d_name.name;
700 fid = p9_client_walk(dfid, 1, &name, 1);
701 p9_fid_put(dfid);
702 if (fid == ERR_PTR(-ENOENT))
703 inode = NULL;
704 else if (IS_ERR(fid))
705 inode = ERR_CAST(fid);
706 else
707 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb, false);
708 /*
709 * If we had a rename on the server and a parallel lookup
710 * for the new name, then make sure we instantiate with
711 * the new name. ie look up for a/b, while on server somebody
712 * moved b under k and client parallely did a lookup for
713 * k/b.
714 */
715 res = d_splice_alias(inode, dentry);
716 if (!IS_ERR(fid)) {
717 if (!res)
718 v9fs_fid_add(dentry, &fid);
719 else if (!IS_ERR(res))
720 v9fs_fid_add(res, &fid);
721 else
722 p9_fid_put(fid);
723 }
724 return res;
725}
726
727static int
728v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
729 struct file *file, unsigned int flags, umode_t mode)
730{
731 int err;
732 u32 perm;
733 struct v9fs_inode __maybe_unused *v9inode;
734 struct v9fs_session_info *v9ses;
735 struct p9_fid *fid;
736 struct dentry *res = NULL;
737 struct inode *inode;
738 int p9_omode;
739
740 if (d_in_lookup(dentry)) {
741 res = v9fs_vfs_lookup(dir, dentry, 0);
742 if (IS_ERR(res))
743 return PTR_ERR(res);
744
745 if (res)
746 dentry = res;
747 }
748
749 /* Only creates */
750 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
751 return finish_no_open(file, res);
752
753 v9ses = v9fs_inode2v9ses(dir);
754 perm = unixmode2p9mode(v9ses, mode);
755 p9_omode = v9fs_uflags2omode(flags, v9fs_proto_dotu(v9ses));
756
757 if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) {
758 p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR;
759 p9_debug(P9_DEBUG_CACHE,
760 "write-only file with writeback enabled, creating w/ O_RDWR\n");
761 }
762 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, p9_omode);
763 if (IS_ERR(fid)) {
764 err = PTR_ERR(fid);
765 goto error;
766 }
767
768 v9fs_invalidate_inode_attr(dir);
769 inode = d_inode(dentry);
770 v9inode = V9FS_I(inode);
771 err = finish_open(file, dentry, generic_file_open);
772 if (err)
773 goto error;
774
775 file->private_data = fid;
776#ifdef CONFIG_9P_FSCACHE
777 if (v9ses->cache & CACHE_FSCACHE)
778 fscache_use_cookie(v9fs_inode_cookie(v9inode),
779 file->f_mode & FMODE_WRITE);
780#endif
781
782 v9fs_fid_add_modes(fid, v9ses->flags, v9ses->cache, file->f_flags);
783 v9fs_open_fid_add(inode, &fid);
784
785 file->f_mode |= FMODE_CREATED;
786out:
787 dput(res);
788 return err;
789
790error:
791 p9_fid_put(fid);
792 goto out;
793}
794
795/**
796 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
797 * @i: inode that is being unlinked
798 * @d: dentry that is being unlinked
799 *
800 */
801
802int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
803{
804 return v9fs_remove(i, d, 0);
805}
806
807/**
808 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
809 * @i: inode that is being unlinked
810 * @d: dentry that is being unlinked
811 *
812 */
813
814int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
815{
816 return v9fs_remove(i, d, AT_REMOVEDIR);
817}
818
819/**
820 * v9fs_vfs_rename - VFS hook to rename an inode
821 * @idmap: The idmap of the mount
822 * @old_dir: old dir inode
823 * @old_dentry: old dentry
824 * @new_dir: new dir inode
825 * @new_dentry: new dentry
826 * @flags: RENAME_* flags
827 *
828 */
829
830int
831v9fs_vfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
832 struct dentry *old_dentry, struct inode *new_dir,
833 struct dentry *new_dentry, unsigned int flags)
834{
835 int retval;
836 struct inode *old_inode;
837 struct inode *new_inode;
838 struct v9fs_session_info *v9ses;
839 struct p9_fid *oldfid = NULL, *dfid = NULL;
840 struct p9_fid *olddirfid = NULL;
841 struct p9_fid *newdirfid = NULL;
842 struct p9_wstat wstat;
843
844 if (flags)
845 return -EINVAL;
846
847 p9_debug(P9_DEBUG_VFS, "\n");
848 old_inode = d_inode(old_dentry);
849 new_inode = d_inode(new_dentry);
850 v9ses = v9fs_inode2v9ses(old_inode);
851 oldfid = v9fs_fid_lookup(old_dentry);
852 if (IS_ERR(oldfid))
853 return PTR_ERR(oldfid);
854
855 dfid = v9fs_parent_fid(old_dentry);
856 olddirfid = clone_fid(dfid);
857 p9_fid_put(dfid);
858 dfid = NULL;
859
860 if (IS_ERR(olddirfid)) {
861 retval = PTR_ERR(olddirfid);
862 goto error;
863 }
864
865 dfid = v9fs_parent_fid(new_dentry);
866 newdirfid = clone_fid(dfid);
867 p9_fid_put(dfid);
868 dfid = NULL;
869
870 if (IS_ERR(newdirfid)) {
871 retval = PTR_ERR(newdirfid);
872 goto error;
873 }
874
875 down_write(&v9ses->rename_sem);
876 if (v9fs_proto_dotl(v9ses)) {
877 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
878 newdirfid, new_dentry->d_name.name);
879 if (retval == -EOPNOTSUPP)
880 retval = p9_client_rename(oldfid, newdirfid,
881 new_dentry->d_name.name);
882 if (retval != -EOPNOTSUPP)
883 goto error_locked;
884 }
885 if (old_dentry->d_parent != new_dentry->d_parent) {
886 /*
887 * 9P .u can only handle file rename in the same directory
888 */
889
890 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
891 retval = -EXDEV;
892 goto error_locked;
893 }
894 v9fs_blank_wstat(&wstat);
895 wstat.muid = v9ses->uname;
896 wstat.name = new_dentry->d_name.name;
897 retval = p9_client_wstat(oldfid, &wstat);
898
899error_locked:
900 if (!retval) {
901 if (new_inode) {
902 if (S_ISDIR(new_inode->i_mode))
903 clear_nlink(new_inode);
904 else
905 v9fs_dec_count(new_inode);
906 }
907 if (S_ISDIR(old_inode->i_mode)) {
908 if (!new_inode)
909 inc_nlink(new_dir);
910 v9fs_dec_count(old_dir);
911 }
912 v9fs_invalidate_inode_attr(old_inode);
913 v9fs_invalidate_inode_attr(old_dir);
914 v9fs_invalidate_inode_attr(new_dir);
915
916 /* successful rename */
917 d_move(old_dentry, new_dentry);
918 }
919 up_write(&v9ses->rename_sem);
920
921error:
922 p9_fid_put(newdirfid);
923 p9_fid_put(olddirfid);
924 p9_fid_put(oldfid);
925 return retval;
926}
927
928/**
929 * v9fs_vfs_getattr - retrieve file metadata
930 * @idmap: idmap of the mount
931 * @path: Object to query
932 * @stat: metadata structure to populate
933 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
934 * @flags: AT_STATX_xxx setting
935 *
936 */
937
938static int
939v9fs_vfs_getattr(struct mnt_idmap *idmap, const struct path *path,
940 struct kstat *stat, u32 request_mask, unsigned int flags)
941{
942 struct dentry *dentry = path->dentry;
943 struct inode *inode = d_inode(dentry);
944 struct v9fs_session_info *v9ses;
945 struct p9_fid *fid;
946 struct p9_wstat *st;
947
948 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
949 v9ses = v9fs_dentry2v9ses(dentry);
950 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
951 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
952 return 0;
953 } else if (v9ses->cache & CACHE_WRITEBACK) {
954 if (S_ISREG(inode->i_mode)) {
955 int retval = filemap_fdatawrite(inode->i_mapping);
956
957 if (retval)
958 p9_debug(P9_DEBUG_ERROR,
959 "flushing writeback during getattr returned %d\n", retval);
960 }
961 }
962 fid = v9fs_fid_lookup(dentry);
963 if (IS_ERR(fid))
964 return PTR_ERR(fid);
965
966 st = p9_client_stat(fid);
967 p9_fid_put(fid);
968 if (IS_ERR(st))
969 return PTR_ERR(st);
970
971 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0);
972 generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat);
973
974 p9stat_free(st);
975 kfree(st);
976 return 0;
977}
978
979/**
980 * v9fs_vfs_setattr - set file metadata
981 * @idmap: idmap of the mount
982 * @dentry: file whose metadata to set
983 * @iattr: metadata assignment structure
984 *
985 */
986
987static int v9fs_vfs_setattr(struct mnt_idmap *idmap,
988 struct dentry *dentry, struct iattr *iattr)
989{
990 int retval, use_dentry = 0;
991 struct inode *inode = d_inode(dentry);
992 struct v9fs_session_info *v9ses;
993 struct p9_fid *fid = NULL;
994 struct p9_wstat wstat;
995
996 p9_debug(P9_DEBUG_VFS, "\n");
997 retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
998 if (retval)
999 return retval;
1000
1001 v9ses = v9fs_dentry2v9ses(dentry);
1002 if (iattr->ia_valid & ATTR_FILE) {
1003 fid = iattr->ia_file->private_data;
1004 WARN_ON(!fid);
1005 }
1006 if (!fid) {
1007 fid = v9fs_fid_lookup(dentry);
1008 use_dentry = 1;
1009 }
1010 if (IS_ERR(fid))
1011 return PTR_ERR(fid);
1012
1013 v9fs_blank_wstat(&wstat);
1014 if (iattr->ia_valid & ATTR_MODE)
1015 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1016
1017 if (iattr->ia_valid & ATTR_MTIME)
1018 wstat.mtime = iattr->ia_mtime.tv_sec;
1019
1020 if (iattr->ia_valid & ATTR_ATIME)
1021 wstat.atime = iattr->ia_atime.tv_sec;
1022
1023 if (iattr->ia_valid & ATTR_SIZE)
1024 wstat.length = iattr->ia_size;
1025
1026 if (v9fs_proto_dotu(v9ses)) {
1027 if (iattr->ia_valid & ATTR_UID)
1028 wstat.n_uid = iattr->ia_uid;
1029
1030 if (iattr->ia_valid & ATTR_GID)
1031 wstat.n_gid = iattr->ia_gid;
1032 }
1033
1034 /* Write all dirty data */
1035 if (d_is_reg(dentry)) {
1036 retval = filemap_fdatawrite(inode->i_mapping);
1037 if (retval)
1038 p9_debug(P9_DEBUG_ERROR,
1039 "flushing writeback during setattr returned %d\n", retval);
1040 }
1041
1042 retval = p9_client_wstat(fid, &wstat);
1043
1044 if (use_dentry)
1045 p9_fid_put(fid);
1046
1047 if (retval < 0)
1048 return retval;
1049
1050 if ((iattr->ia_valid & ATTR_SIZE) &&
1051 iattr->ia_size != i_size_read(inode)) {
1052 truncate_setsize(inode, iattr->ia_size);
1053 netfs_resize_file(netfs_inode(inode), iattr->ia_size, true);
1054
1055#ifdef CONFIG_9P_FSCACHE
1056 if (v9ses->cache & CACHE_FSCACHE) {
1057 struct v9fs_inode *v9inode = V9FS_I(inode);
1058
1059 fscache_resize_cookie(v9fs_inode_cookie(v9inode), iattr->ia_size);
1060 }
1061#endif
1062 }
1063
1064 v9fs_invalidate_inode_attr(inode);
1065
1066 setattr_copy(&nop_mnt_idmap, inode, iattr);
1067 mark_inode_dirty(inode);
1068 return 0;
1069}
1070
1071/**
1072 * v9fs_stat2inode - populate an inode structure with mistat info
1073 * @stat: Plan 9 metadata (mistat) structure
1074 * @inode: inode to populate
1075 * @sb: superblock of filesystem
1076 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
1077 *
1078 */
1079
1080void
1081v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1082 struct super_block *sb, unsigned int flags)
1083{
1084 umode_t mode;
1085 struct v9fs_session_info *v9ses = sb->s_fs_info;
1086 struct v9fs_inode *v9inode = V9FS_I(inode);
1087
1088 inode_set_atime(inode, stat->atime, 0);
1089 inode_set_mtime(inode, stat->mtime, 0);
1090 inode_set_ctime(inode, stat->mtime, 0);
1091
1092 inode->i_uid = v9ses->dfltuid;
1093 inode->i_gid = v9ses->dfltgid;
1094
1095 if (v9fs_proto_dotu(v9ses)) {
1096 inode->i_uid = stat->n_uid;
1097 inode->i_gid = stat->n_gid;
1098 }
1099 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1100 if (v9fs_proto_dotu(v9ses)) {
1101 unsigned int i_nlink;
1102 /*
1103 * Hadlink support got added later to the .u extension.
1104 * So there can be a server out there that doesn't
1105 * support this even with .u extension. That would
1106 * just leave us with stat->extension being an empty
1107 * string, though.
1108 */
1109 /* HARDLINKCOUNT %u */
1110 if (sscanf(stat->extension,
1111 " HARDLINKCOUNT %u", &i_nlink) == 1)
1112 set_nlink(inode, i_nlink);
1113 }
1114 }
1115 mode = p9mode2perm(v9ses, stat);
1116 mode |= inode->i_mode & ~S_IALLUGO;
1117 inode->i_mode = mode;
1118
1119 v9inode->netfs.remote_i_size = stat->length;
1120 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
1121 v9fs_i_size_write(inode, stat->length);
1122 /* not real number of blocks, but 512 byte ones ... */
1123 inode->i_blocks = (stat->length + 512 - 1) >> 9;
1124 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1125}
1126
1127/**
1128 * v9fs_vfs_get_link - follow a symlink path
1129 * @dentry: dentry for symlink
1130 * @inode: inode for symlink
1131 * @done: delayed call for when we are done with the return value
1132 */
1133
1134static const char *v9fs_vfs_get_link(struct dentry *dentry,
1135 struct inode *inode,
1136 struct delayed_call *done)
1137{
1138 struct v9fs_session_info *v9ses;
1139 struct p9_fid *fid;
1140 struct p9_wstat *st;
1141 char *res;
1142
1143 if (!dentry)
1144 return ERR_PTR(-ECHILD);
1145
1146 v9ses = v9fs_dentry2v9ses(dentry);
1147 if (!v9fs_proto_dotu(v9ses))
1148 return ERR_PTR(-EBADF);
1149
1150 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
1151 fid = v9fs_fid_lookup(dentry);
1152
1153 if (IS_ERR(fid))
1154 return ERR_CAST(fid);
1155
1156 st = p9_client_stat(fid);
1157 p9_fid_put(fid);
1158 if (IS_ERR(st))
1159 return ERR_CAST(st);
1160
1161 if (!(st->mode & P9_DMSYMLINK)) {
1162 p9stat_free(st);
1163 kfree(st);
1164 return ERR_PTR(-EINVAL);
1165 }
1166 res = st->extension;
1167 st->extension = NULL;
1168 if (strlen(res) >= PATH_MAX)
1169 res[PATH_MAX - 1] = '\0';
1170
1171 p9stat_free(st);
1172 kfree(st);
1173 set_delayed_call(done, kfree_link, res);
1174 return res;
1175}
1176
1177/**
1178 * v9fs_vfs_mkspecial - create a special file
1179 * @dir: inode to create special file in
1180 * @dentry: dentry to create
1181 * @perm: mode to create special file
1182 * @extension: 9p2000.u format extension string representing special file
1183 *
1184 */
1185
1186static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1187 u32 perm, const char *extension)
1188{
1189 struct p9_fid *fid;
1190 struct v9fs_session_info *v9ses;
1191
1192 v9ses = v9fs_inode2v9ses(dir);
1193 if (!v9fs_proto_dotu(v9ses)) {
1194 p9_debug(P9_DEBUG_ERROR, "not extended\n");
1195 return -EPERM;
1196 }
1197
1198 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1199 P9_OREAD);
1200 if (IS_ERR(fid))
1201 return PTR_ERR(fid);
1202
1203 v9fs_invalidate_inode_attr(dir);
1204 p9_fid_put(fid);
1205 return 0;
1206}
1207
1208/**
1209 * v9fs_vfs_symlink - helper function to create symlinks
1210 * @idmap: idmap of the mount
1211 * @dir: directory inode containing symlink
1212 * @dentry: dentry for symlink
1213 * @symname: symlink data
1214 *
1215 * See Also: 9P2000.u RFC for more information
1216 *
1217 */
1218
1219static int
1220v9fs_vfs_symlink(struct mnt_idmap *idmap, struct inode *dir,
1221 struct dentry *dentry, const char *symname)
1222{
1223 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n",
1224 dir->i_ino, dentry, symname);
1225
1226 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname);
1227}
1228
1229#define U32_MAX_DIGITS 10
1230
1231/**
1232 * v9fs_vfs_link - create a hardlink
1233 * @old_dentry: dentry for file to link to
1234 * @dir: inode destination for new link
1235 * @dentry: dentry for link
1236 *
1237 */
1238
1239static int
1240v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1241 struct dentry *dentry)
1242{
1243 int retval;
1244 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */
1245 struct p9_fid *oldfid;
1246
1247 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n",
1248 dir->i_ino, dentry, old_dentry);
1249
1250 oldfid = v9fs_fid_clone(old_dentry);
1251 if (IS_ERR(oldfid))
1252 return PTR_ERR(oldfid);
1253
1254 sprintf(name, "%d\n", oldfid->fid);
1255 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1256 if (!retval) {
1257 v9fs_refresh_inode(oldfid, d_inode(old_dentry));
1258 v9fs_invalidate_inode_attr(dir);
1259 }
1260 p9_fid_put(oldfid);
1261 return retval;
1262}
1263
1264/**
1265 * v9fs_vfs_mknod - create a special file
1266 * @idmap: idmap of the mount
1267 * @dir: inode destination for new link
1268 * @dentry: dentry for file
1269 * @mode: mode for creation
1270 * @rdev: device associated with special file
1271 *
1272 */
1273
1274static int
1275v9fs_vfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
1276 struct dentry *dentry, umode_t mode, dev_t rdev)
1277{
1278 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1279 int retval;
1280 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1];
1281 u32 perm;
1282
1283 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
1284 dir->i_ino, dentry, mode,
1285 MAJOR(rdev), MINOR(rdev));
1286
1287 /* build extension */
1288 if (S_ISBLK(mode))
1289 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1290 else if (S_ISCHR(mode))
1291 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1292 else
1293 *name = 0;
1294
1295 perm = unixmode2p9mode(v9ses, mode);
1296 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name);
1297
1298 return retval;
1299}
1300
1301int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1302{
1303 int umode;
1304 dev_t rdev;
1305 struct p9_wstat *st;
1306 struct v9fs_session_info *v9ses;
1307 unsigned int flags;
1308
1309 v9ses = v9fs_inode2v9ses(inode);
1310 st = p9_client_stat(fid);
1311 if (IS_ERR(st))
1312 return PTR_ERR(st);
1313 /*
1314 * Don't update inode if the file type is different
1315 */
1316 umode = p9mode2unixmode(v9ses, st, &rdev);
1317 if (inode_wrong_type(inode, umode))
1318 goto out;
1319
1320 /*
1321 * We don't want to refresh inode->i_size,
1322 * because we may have cached data
1323 */
1324 flags = (v9ses->cache & CACHE_LOOSE) ?
1325 V9FS_STAT2INODE_KEEP_ISIZE : 0;
1326 v9fs_stat2inode(st, inode, inode->i_sb, flags);
1327out:
1328 p9stat_free(st);
1329 kfree(st);
1330 return 0;
1331}
1332
1333static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1334 .create = v9fs_vfs_create,
1335 .lookup = v9fs_vfs_lookup,
1336 .atomic_open = v9fs_vfs_atomic_open,
1337 .symlink = v9fs_vfs_symlink,
1338 .link = v9fs_vfs_link,
1339 .unlink = v9fs_vfs_unlink,
1340 .mkdir = v9fs_vfs_mkdir,
1341 .rmdir = v9fs_vfs_rmdir,
1342 .mknod = v9fs_vfs_mknod,
1343 .rename = v9fs_vfs_rename,
1344 .getattr = v9fs_vfs_getattr,
1345 .setattr = v9fs_vfs_setattr,
1346};
1347
1348static const struct inode_operations v9fs_dir_inode_operations = {
1349 .create = v9fs_vfs_create,
1350 .lookup = v9fs_vfs_lookup,
1351 .atomic_open = v9fs_vfs_atomic_open,
1352 .unlink = v9fs_vfs_unlink,
1353 .mkdir = v9fs_vfs_mkdir,
1354 .rmdir = v9fs_vfs_rmdir,
1355 .mknod = v9fs_vfs_mknod,
1356 .rename = v9fs_vfs_rename,
1357 .getattr = v9fs_vfs_getattr,
1358 .setattr = v9fs_vfs_setattr,
1359};
1360
1361static const struct inode_operations v9fs_file_inode_operations = {
1362 .getattr = v9fs_vfs_getattr,
1363 .setattr = v9fs_vfs_setattr,
1364};
1365
1366static const struct inode_operations v9fs_symlink_inode_operations = {
1367 .get_link = v9fs_vfs_get_link,
1368 .getattr = v9fs_vfs_getattr,
1369 .setattr = v9fs_vfs_setattr,
1370};
1371