1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * This file contains vfs inode ops for the 9P2000.L 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#include <linux/module.h>
10#include <linux/errno.h>
11#include <linux/fs.h>
12#include <linux/file.h>
13#include <linux/pagemap.h>
14#include <linux/stat.h>
15#include <linux/string.h>
16#include <linux/namei.h>
17#include <linux/sched.h>
18#include <linux/slab.h>
19#include <linux/xattr.h>
20#include <linux/posix_acl.h>
21#include <net/9p/9p.h>
22#include <net/9p/client.h>
23
24#include "v9fs.h"
25#include "v9fs_vfs.h"
26#include "fid.h"
27#include "cache.h"
28#include "xattr.h"
29#include "acl.h"
30
31static int
32v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir,
33 struct dentry *dentry, umode_t omode, dev_t rdev);
34
35/**
36 * v9fs_get_fsgid_for_create - Helper function to get the gid for a new object
37 * @dir_inode: The directory inode
38 *
39 * Helper function to get the gid for creating a
40 * new file system object. This checks the S_ISGID to determine the owning
41 * group of the new file system object.
42 */
43
44static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
45{
46 BUG_ON(dir_inode == NULL);
47
48 if (dir_inode->i_mode & S_ISGID) {
49 /* set_gid bit is set.*/
50 return dir_inode->i_gid;
51 }
52 return current_fsgid();
53}
54
55struct inode *v9fs_fid_iget_dotl(struct super_block *sb, struct p9_fid *fid)
56{
57 int retval;
58 struct inode *inode;
59 struct p9_stat_dotl *st;
60 struct v9fs_session_info *v9ses = sb->s_fs_info;
61
62 inode = iget_locked(sb, QID2INO(&fid->qid));
63 if (unlikely(!inode))
64 return ERR_PTR(error: -ENOMEM);
65 if (!(inode->i_state & I_NEW))
66 return inode;
67
68 /*
69 * initialize the inode with the stat info
70 * FIXME!! we may need support for stale inodes
71 * later.
72 */
73 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
74 if (IS_ERR(ptr: st)) {
75 retval = PTR_ERR(ptr: st);
76 goto error;
77 }
78
79 retval = v9fs_init_inode(v9ses, inode, qid: &fid->qid,
80 mode: st->st_mode, rdev: new_decode_dev(dev: st->st_rdev));
81 v9fs_stat2inode_dotl(stat: st, inode, flags: 0);
82 kfree(objp: st);
83 if (retval)
84 goto error;
85
86 v9fs_set_netfs_context(inode);
87 v9fs_cache_inode_get_cookie(inode);
88 retval = v9fs_get_acl(inode, fid);
89 if (retval)
90 goto error;
91
92 unlock_new_inode(inode);
93
94 return inode;
95error:
96 iget_failed(inode);
97 return ERR_PTR(error: retval);
98
99}
100
101struct dotl_openflag_map {
102 int open_flag;
103 int dotl_flag;
104};
105
106static int v9fs_mapped_dotl_flags(int flags)
107{
108 int i;
109 int rflags = 0;
110 struct dotl_openflag_map dotl_oflag_map[] = {
111 { O_CREAT, P9_DOTL_CREATE },
112 { O_EXCL, P9_DOTL_EXCL },
113 { O_NOCTTY, P9_DOTL_NOCTTY },
114 { O_APPEND, P9_DOTL_APPEND },
115 { O_NONBLOCK, P9_DOTL_NONBLOCK },
116 { O_DSYNC, P9_DOTL_DSYNC },
117 { FASYNC, P9_DOTL_FASYNC },
118 { O_DIRECT, P9_DOTL_DIRECT },
119 { O_LARGEFILE, P9_DOTL_LARGEFILE },
120 { O_DIRECTORY, P9_DOTL_DIRECTORY },
121 { O_NOFOLLOW, P9_DOTL_NOFOLLOW },
122 { O_NOATIME, P9_DOTL_NOATIME },
123 { O_CLOEXEC, P9_DOTL_CLOEXEC },
124 { O_SYNC, P9_DOTL_SYNC},
125 };
126 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
127 if (flags & dotl_oflag_map[i].open_flag)
128 rflags |= dotl_oflag_map[i].dotl_flag;
129 }
130 return rflags;
131}
132
133/**
134 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
135 * plan 9 open flag.
136 * @flags: flags to convert
137 */
138int v9fs_open_to_dotl_flags(int flags)
139{
140 int rflags = 0;
141
142 /*
143 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
144 * and P9_DOTL_NOACCESS
145 */
146 rflags |= flags & O_ACCMODE;
147 rflags |= v9fs_mapped_dotl_flags(flags);
148
149 return rflags;
150}
151
152/**
153 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
154 * @idmap: The user namespace of the mount
155 * @dir: directory inode that is being created
156 * @dentry: dentry that is being deleted
157 * @omode: create permissions
158 * @excl: True if the file must not yet exist
159 *
160 */
161static int
162v9fs_vfs_create_dotl(struct mnt_idmap *idmap, struct inode *dir,
163 struct dentry *dentry, umode_t omode, bool excl)
164{
165 return v9fs_vfs_mknod_dotl(idmap, dir, dentry, omode, rdev: 0);
166}
167
168static int
169v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
170 struct file *file, unsigned int flags, umode_t omode)
171{
172 int err = 0;
173 kgid_t gid;
174 umode_t mode;
175 int p9_omode = v9fs_open_to_dotl_flags(flags);
176 const unsigned char *name = NULL;
177 struct p9_qid qid;
178 struct inode *inode;
179 struct p9_fid *fid = NULL;
180 struct p9_fid *dfid = NULL, *ofid = NULL;
181 struct v9fs_session_info *v9ses;
182 struct posix_acl *pacl = NULL, *dacl = NULL;
183 struct dentry *res = NULL;
184
185 if (d_in_lookup(dentry)) {
186 res = v9fs_vfs_lookup(dir, dentry, flags: 0);
187 if (IS_ERR(ptr: res))
188 return PTR_ERR(ptr: res);
189
190 if (res)
191 dentry = res;
192 }
193
194 /* Only creates */
195 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
196 return finish_no_open(file, dentry: res);
197
198 v9ses = v9fs_inode2v9ses(inode: dir);
199
200 name = dentry->d_name.name;
201 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%x\n",
202 name, flags, omode);
203
204 dfid = v9fs_parent_fid(dentry);
205 if (IS_ERR(ptr: dfid)) {
206 err = PTR_ERR(ptr: dfid);
207 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
208 goto out;
209 }
210
211 /* clone a fid to use for creation */
212 ofid = clone_fid(fid: dfid);
213 if (IS_ERR(ptr: ofid)) {
214 err = PTR_ERR(ptr: ofid);
215 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
216 goto out;
217 }
218
219 gid = v9fs_get_fsgid_for_create(dir_inode: dir);
220
221 mode = omode;
222 /* Update mode based on ACL value */
223 err = v9fs_acl_mode(dir, modep: &mode, dpacl: &dacl, pacl: &pacl);
224 if (err) {
225 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in create %d\n",
226 err);
227 goto out;
228 }
229
230 if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) {
231 p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR;
232 p9_debug(P9_DEBUG_CACHE,
233 "write-only file with writeback enabled, creating w/ O_RDWR\n");
234 }
235 err = p9_client_create_dotl(ofid, name, flags: p9_omode, mode, gid, qid: &qid);
236 if (err < 0) {
237 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in create %d\n",
238 err);
239 goto out;
240 }
241 v9fs_invalidate_inode_attr(inode: dir);
242
243 /* instantiate inode and assign the unopened fid to the dentry */
244 fid = p9_client_walk(oldfid: dfid, nwname: 1, wnames: &name, clone: 1);
245 if (IS_ERR(ptr: fid)) {
246 err = PTR_ERR(ptr: fid);
247 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
248 goto out;
249 }
250 inode = v9fs_fid_iget_dotl(sb: dir->i_sb, fid);
251 if (IS_ERR(ptr: inode)) {
252 err = PTR_ERR(ptr: inode);
253 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
254 goto out;
255 }
256 /* Now set the ACL based on the default value */
257 v9fs_set_create_acl(inode, fid, dacl, acl: pacl);
258
259 v9fs_fid_add(dentry, fid: &fid);
260 d_instantiate(dentry, inode);
261
262 /* Since we are opening a file, assign the open fid to the file */
263 err = finish_open(file, dentry, open: generic_file_open);
264 if (err)
265 goto out;
266 file->private_data = ofid;
267#ifdef CONFIG_9P_FSCACHE
268 if (v9ses->cache & CACHE_FSCACHE) {
269 struct v9fs_inode *v9inode = V9FS_I(inode);
270 fscache_use_cookie(cookie: v9fs_inode_cookie(v9inode),
271 will_modify: file->f_mode & FMODE_WRITE);
272 }
273#endif
274 v9fs_fid_add_modes(fid: ofid, s_flags: v9ses->flags, s_cache: v9ses->cache, f_flags: flags);
275 v9fs_open_fid_add(inode, fid: &ofid);
276 file->f_mode |= FMODE_CREATED;
277out:
278 p9_fid_put(fid: dfid);
279 p9_fid_put(fid: ofid);
280 p9_fid_put(fid);
281 v9fs_put_acl(dacl, acl: pacl);
282 dput(res);
283 return err;
284}
285
286/**
287 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
288 * @idmap: The idmap of the mount
289 * @dir: inode that is being unlinked
290 * @dentry: dentry that is being unlinked
291 * @omode: mode for new directory
292 *
293 */
294
295static int v9fs_vfs_mkdir_dotl(struct mnt_idmap *idmap,
296 struct inode *dir, struct dentry *dentry,
297 umode_t omode)
298{
299 int err;
300 struct p9_fid *fid = NULL, *dfid = NULL;
301 kgid_t gid;
302 const unsigned char *name;
303 umode_t mode;
304 struct inode *inode;
305 struct p9_qid qid;
306 struct posix_acl *dacl = NULL, *pacl = NULL;
307
308 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
309
310 omode |= S_IFDIR;
311 if (dir->i_mode & S_ISGID)
312 omode |= S_ISGID;
313
314 dfid = v9fs_parent_fid(dentry);
315 if (IS_ERR(ptr: dfid)) {
316 err = PTR_ERR(ptr: dfid);
317 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
318 goto error;
319 }
320
321 gid = v9fs_get_fsgid_for_create(dir_inode: dir);
322 mode = omode;
323 /* Update mode based on ACL value */
324 err = v9fs_acl_mode(dir, modep: &mode, dpacl: &dacl, pacl: &pacl);
325 if (err) {
326 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
327 err);
328 goto error;
329 }
330 name = dentry->d_name.name;
331 err = p9_client_mkdir_dotl(fid: dfid, name, mode, gid, qid: &qid);
332 if (err < 0)
333 goto error;
334 fid = p9_client_walk(oldfid: dfid, nwname: 1, wnames: &name, clone: 1);
335 if (IS_ERR(ptr: fid)) {
336 err = PTR_ERR(ptr: fid);
337 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
338 err);
339 goto error;
340 }
341
342 /* instantiate inode and assign the unopened fid to the dentry */
343 inode = v9fs_fid_iget_dotl(sb: dir->i_sb, fid);
344 if (IS_ERR(ptr: inode)) {
345 err = PTR_ERR(ptr: inode);
346 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
347 err);
348 goto error;
349 }
350 v9fs_fid_add(dentry, fid: &fid);
351 v9fs_set_create_acl(inode, fid, dacl, acl: pacl);
352 d_instantiate(dentry, inode);
353 err = 0;
354 inc_nlink(inode: dir);
355 v9fs_invalidate_inode_attr(inode: dir);
356error:
357 p9_fid_put(fid);
358 v9fs_put_acl(dacl, acl: pacl);
359 p9_fid_put(fid: dfid);
360 return err;
361}
362
363static int
364v9fs_vfs_getattr_dotl(struct mnt_idmap *idmap,
365 const struct path *path, struct kstat *stat,
366 u32 request_mask, unsigned int flags)
367{
368 struct dentry *dentry = path->dentry;
369 struct v9fs_session_info *v9ses;
370 struct p9_fid *fid;
371 struct inode *inode = d_inode(dentry);
372 struct p9_stat_dotl *st;
373
374 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
375 v9ses = v9fs_dentry2v9ses(dentry);
376 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
377 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
378 return 0;
379 } else if (v9ses->cache) {
380 if (S_ISREG(inode->i_mode)) {
381 int retval = filemap_fdatawrite(inode->i_mapping);
382
383 if (retval)
384 p9_debug(P9_DEBUG_ERROR,
385 "flushing writeback during getattr returned %d\n", retval);
386 }
387 }
388 fid = v9fs_fid_lookup(dentry);
389 if (IS_ERR(ptr: fid))
390 return PTR_ERR(ptr: fid);
391
392 /* Ask for all the fields in stat structure. Server will return
393 * whatever it supports
394 */
395
396 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
397 p9_fid_put(fid);
398 if (IS_ERR(ptr: st))
399 return PTR_ERR(ptr: st);
400
401 v9fs_stat2inode_dotl(stat: st, inode: d_inode(dentry), flags: 0);
402 generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat);
403 /* Change block size to what the server returned */
404 stat->blksize = st->st_blksize;
405
406 kfree(objp: st);
407 return 0;
408}
409
410/*
411 * Attribute flags.
412 */
413#define P9_ATTR_MODE (1 << 0)
414#define P9_ATTR_UID (1 << 1)
415#define P9_ATTR_GID (1 << 2)
416#define P9_ATTR_SIZE (1 << 3)
417#define P9_ATTR_ATIME (1 << 4)
418#define P9_ATTR_MTIME (1 << 5)
419#define P9_ATTR_CTIME (1 << 6)
420#define P9_ATTR_ATIME_SET (1 << 7)
421#define P9_ATTR_MTIME_SET (1 << 8)
422
423struct dotl_iattr_map {
424 int iattr_valid;
425 int p9_iattr_valid;
426};
427
428static int v9fs_mapped_iattr_valid(int iattr_valid)
429{
430 int i;
431 int p9_iattr_valid = 0;
432 struct dotl_iattr_map dotl_iattr_map[] = {
433 { ATTR_MODE, P9_ATTR_MODE },
434 { ATTR_UID, P9_ATTR_UID },
435 { ATTR_GID, P9_ATTR_GID },
436 { ATTR_SIZE, P9_ATTR_SIZE },
437 { ATTR_ATIME, P9_ATTR_ATIME },
438 { ATTR_MTIME, P9_ATTR_MTIME },
439 { ATTR_CTIME, P9_ATTR_CTIME },
440 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET },
441 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET },
442 };
443 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
444 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
445 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
446 }
447 return p9_iattr_valid;
448}
449
450/**
451 * v9fs_vfs_setattr_dotl - set file metadata
452 * @idmap: idmap of the mount
453 * @dentry: file whose metadata to set
454 * @iattr: metadata assignment structure
455 *
456 */
457
458int v9fs_vfs_setattr_dotl(struct mnt_idmap *idmap,
459 struct dentry *dentry, struct iattr *iattr)
460{
461 int retval, use_dentry = 0;
462 struct inode *inode = d_inode(dentry);
463 struct v9fs_session_info __maybe_unused *v9ses;
464 struct p9_fid *fid = NULL;
465 struct p9_iattr_dotl p9attr = {
466 .uid = INVALID_UID,
467 .gid = INVALID_GID,
468 };
469
470 p9_debug(P9_DEBUG_VFS, "\n");
471
472 retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
473 if (retval)
474 return retval;
475
476 v9ses = v9fs_dentry2v9ses(dentry);
477
478 p9attr.valid = v9fs_mapped_iattr_valid(iattr_valid: iattr->ia_valid);
479 if (iattr->ia_valid & ATTR_MODE)
480 p9attr.mode = iattr->ia_mode;
481 if (iattr->ia_valid & ATTR_UID)
482 p9attr.uid = iattr->ia_uid;
483 if (iattr->ia_valid & ATTR_GID)
484 p9attr.gid = iattr->ia_gid;
485 if (iattr->ia_valid & ATTR_SIZE)
486 p9attr.size = iattr->ia_size;
487 if (iattr->ia_valid & ATTR_ATIME_SET) {
488 p9attr.atime_sec = iattr->ia_atime.tv_sec;
489 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
490 }
491 if (iattr->ia_valid & ATTR_MTIME_SET) {
492 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
493 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
494 }
495
496 if (iattr->ia_valid & ATTR_FILE) {
497 fid = iattr->ia_file->private_data;
498 WARN_ON(!fid);
499 }
500 if (!fid) {
501 fid = v9fs_fid_lookup(dentry);
502 use_dentry = 1;
503 }
504 if (IS_ERR(ptr: fid))
505 return PTR_ERR(ptr: fid);
506
507 /* Write all dirty data */
508 if (S_ISREG(inode->i_mode)) {
509 retval = filemap_fdatawrite(inode->i_mapping);
510 if (retval < 0)
511 p9_debug(P9_DEBUG_ERROR,
512 "Flushing file prior to setattr failed: %d\n", retval);
513 }
514
515 retval = p9_client_setattr(fid, attr: &p9attr);
516 if (retval < 0) {
517 if (use_dentry)
518 p9_fid_put(fid);
519 return retval;
520 }
521
522 if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size !=
523 i_size_read(inode)) {
524 truncate_setsize(inode, newsize: iattr->ia_size);
525 netfs_resize_file(ctx: netfs_inode(inode), new_i_size: iattr->ia_size, changed_on_server: true);
526
527#ifdef CONFIG_9P_FSCACHE
528 if (v9ses->cache & CACHE_FSCACHE)
529 fscache_resize_cookie(cookie: v9fs_inode_cookie(v9inode: V9FS_I(inode)),
530 new_size: iattr->ia_size);
531#endif
532 }
533
534 v9fs_invalidate_inode_attr(inode);
535 setattr_copy(&nop_mnt_idmap, inode, attr: iattr);
536 mark_inode_dirty(inode);
537 if (iattr->ia_valid & ATTR_MODE) {
538 /* We also want to update ACL when we update mode bits */
539 retval = v9fs_acl_chmod(inode, fid);
540 if (retval < 0) {
541 if (use_dentry)
542 p9_fid_put(fid);
543 return retval;
544 }
545 }
546 if (use_dentry)
547 p9_fid_put(fid);
548
549 return 0;
550}
551
552/**
553 * v9fs_stat2inode_dotl - populate an inode structure with stat info
554 * @stat: stat structure
555 * @inode: inode to populate
556 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
557 *
558 */
559
560void
561v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
562 unsigned int flags)
563{
564 umode_t mode;
565 struct v9fs_inode *v9inode = V9FS_I(inode);
566
567 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
568 inode_set_atime(inode, sec: stat->st_atime_sec,
569 nsec: stat->st_atime_nsec);
570 inode_set_mtime(inode, sec: stat->st_mtime_sec,
571 nsec: stat->st_mtime_nsec);
572 inode_set_ctime(inode, sec: stat->st_ctime_sec,
573 nsec: stat->st_ctime_nsec);
574 inode->i_uid = stat->st_uid;
575 inode->i_gid = stat->st_gid;
576 set_nlink(inode, nlink: stat->st_nlink);
577
578 mode = stat->st_mode & S_IALLUGO;
579 mode |= inode->i_mode & ~S_IALLUGO;
580 inode->i_mode = mode;
581
582 v9inode->netfs.remote_i_size = stat->st_size;
583 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
584 v9fs_i_size_write(inode, i_size: stat->st_size);
585 inode->i_blocks = stat->st_blocks;
586 } else {
587 if (stat->st_result_mask & P9_STATS_ATIME) {
588 inode_set_atime(inode, sec: stat->st_atime_sec,
589 nsec: stat->st_atime_nsec);
590 }
591 if (stat->st_result_mask & P9_STATS_MTIME) {
592 inode_set_mtime(inode, sec: stat->st_mtime_sec,
593 nsec: stat->st_mtime_nsec);
594 }
595 if (stat->st_result_mask & P9_STATS_CTIME) {
596 inode_set_ctime(inode, sec: stat->st_ctime_sec,
597 nsec: stat->st_ctime_nsec);
598 }
599 if (stat->st_result_mask & P9_STATS_UID)
600 inode->i_uid = stat->st_uid;
601 if (stat->st_result_mask & P9_STATS_GID)
602 inode->i_gid = stat->st_gid;
603 if (stat->st_result_mask & P9_STATS_NLINK)
604 set_nlink(inode, nlink: stat->st_nlink);
605 if (stat->st_result_mask & P9_STATS_MODE) {
606 mode = stat->st_mode & S_IALLUGO;
607 mode |= inode->i_mode & ~S_IALLUGO;
608 inode->i_mode = mode;
609 }
610 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
611 stat->st_result_mask & P9_STATS_SIZE) {
612 v9inode->netfs.remote_i_size = stat->st_size;
613 v9fs_i_size_write(inode, i_size: stat->st_size);
614 }
615 if (stat->st_result_mask & P9_STATS_BLOCKS)
616 inode->i_blocks = stat->st_blocks;
617 }
618 if (stat->st_result_mask & P9_STATS_GEN)
619 inode->i_generation = stat->st_gen;
620
621 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
622 * because the inode structure does not have fields for them.
623 */
624 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
625}
626
627static int
628v9fs_vfs_symlink_dotl(struct mnt_idmap *idmap, struct inode *dir,
629 struct dentry *dentry, const char *symname)
630{
631 int err;
632 kgid_t gid;
633 const unsigned char *name;
634 struct p9_qid qid;
635 struct p9_fid *dfid;
636 struct p9_fid *fid = NULL;
637
638 name = dentry->d_name.name;
639 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
640
641 dfid = v9fs_parent_fid(dentry);
642 if (IS_ERR(ptr: dfid)) {
643 err = PTR_ERR(ptr: dfid);
644 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
645 return err;
646 }
647
648 gid = v9fs_get_fsgid_for_create(dir_inode: dir);
649
650 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
651 err = p9_client_symlink(fid: dfid, name, symname, gid, qid: &qid);
652
653 if (err < 0) {
654 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
655 goto error;
656 }
657
658 v9fs_invalidate_inode_attr(inode: dir);
659
660error:
661 p9_fid_put(fid);
662 p9_fid_put(fid: dfid);
663 return err;
664}
665
666/**
667 * v9fs_vfs_link_dotl - create a hardlink for dotl
668 * @old_dentry: dentry for file to link to
669 * @dir: inode destination for new link
670 * @dentry: dentry for link
671 *
672 */
673
674static int
675v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
676 struct dentry *dentry)
677{
678 int err;
679 struct p9_fid *dfid, *oldfid;
680 struct v9fs_session_info *v9ses;
681
682 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
683 dir->i_ino, old_dentry, dentry);
684
685 v9ses = v9fs_inode2v9ses(inode: dir);
686 dfid = v9fs_parent_fid(dentry);
687 if (IS_ERR(ptr: dfid))
688 return PTR_ERR(ptr: dfid);
689
690 oldfid = v9fs_fid_lookup(dentry: old_dentry);
691 if (IS_ERR(ptr: oldfid)) {
692 p9_fid_put(fid: dfid);
693 return PTR_ERR(ptr: oldfid);
694 }
695
696 err = p9_client_link(fid: dfid, oldfid, newname: dentry->d_name.name);
697
698 p9_fid_put(fid: dfid);
699 p9_fid_put(fid: oldfid);
700 if (err < 0) {
701 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
702 return err;
703 }
704
705 v9fs_invalidate_inode_attr(inode: dir);
706 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
707 /* Get the latest stat info from server. */
708 struct p9_fid *fid;
709
710 fid = v9fs_fid_lookup(dentry: old_dentry);
711 if (IS_ERR(ptr: fid))
712 return PTR_ERR(ptr: fid);
713
714 v9fs_refresh_inode_dotl(fid, inode: d_inode(dentry: old_dentry));
715 p9_fid_put(fid);
716 }
717 ihold(inode: d_inode(dentry: old_dentry));
718 d_instantiate(dentry, d_inode(dentry: old_dentry));
719
720 return err;
721}
722
723/**
724 * v9fs_vfs_mknod_dotl - create a special file
725 * @idmap: The idmap of the mount
726 * @dir: inode destination for new link
727 * @dentry: dentry for file
728 * @omode: mode for creation
729 * @rdev: device associated with special file
730 *
731 */
732static int
733v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir,
734 struct dentry *dentry, umode_t omode, dev_t rdev)
735{
736 int err;
737 kgid_t gid;
738 const unsigned char *name;
739 umode_t mode;
740 struct p9_fid *fid = NULL, *dfid = NULL;
741 struct inode *inode;
742 struct p9_qid qid;
743 struct posix_acl *dacl = NULL, *pacl = NULL;
744
745 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
746 dir->i_ino, dentry, omode,
747 MAJOR(rdev), MINOR(rdev));
748
749 dfid = v9fs_parent_fid(dentry);
750 if (IS_ERR(ptr: dfid)) {
751 err = PTR_ERR(ptr: dfid);
752 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
753 goto error;
754 }
755
756 gid = v9fs_get_fsgid_for_create(dir_inode: dir);
757 mode = omode;
758 /* Update mode based on ACL value */
759 err = v9fs_acl_mode(dir, modep: &mode, dpacl: &dacl, pacl: &pacl);
760 if (err) {
761 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
762 err);
763 goto error;
764 }
765 name = dentry->d_name.name;
766
767 err = p9_client_mknod_dotl(oldfid: dfid, name, mode, rdev, gid, qid: &qid);
768 if (err < 0)
769 goto error;
770
771 v9fs_invalidate_inode_attr(inode: dir);
772 fid = p9_client_walk(oldfid: dfid, nwname: 1, wnames: &name, clone: 1);
773 if (IS_ERR(ptr: fid)) {
774 err = PTR_ERR(ptr: fid);
775 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
776 err);
777 goto error;
778 }
779 inode = v9fs_fid_iget_dotl(sb: dir->i_sb, fid);
780 if (IS_ERR(ptr: inode)) {
781 err = PTR_ERR(ptr: inode);
782 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
783 err);
784 goto error;
785 }
786 v9fs_set_create_acl(inode, fid, dacl, acl: pacl);
787 v9fs_fid_add(dentry, fid: &fid);
788 d_instantiate(dentry, inode);
789 err = 0;
790error:
791 p9_fid_put(fid);
792 v9fs_put_acl(dacl, acl: pacl);
793 p9_fid_put(fid: dfid);
794
795 return err;
796}
797
798/**
799 * v9fs_vfs_get_link_dotl - follow a symlink path
800 * @dentry: dentry for symlink
801 * @inode: inode for symlink
802 * @done: destructor for return value
803 */
804
805static const char *
806v9fs_vfs_get_link_dotl(struct dentry *dentry,
807 struct inode *inode,
808 struct delayed_call *done)
809{
810 struct p9_fid *fid;
811 char *target;
812 int retval;
813
814 if (!dentry)
815 return ERR_PTR(error: -ECHILD);
816
817 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
818
819 fid = v9fs_fid_lookup(dentry);
820 if (IS_ERR(ptr: fid))
821 return ERR_CAST(ptr: fid);
822 retval = p9_client_readlink(fid, target: &target);
823 p9_fid_put(fid);
824 if (retval)
825 return ERR_PTR(error: retval);
826 set_delayed_call(call: done, fn: kfree_link, arg: target);
827 return target;
828}
829
830int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
831{
832 struct p9_stat_dotl *st;
833 struct v9fs_session_info *v9ses;
834 unsigned int flags;
835
836 v9ses = v9fs_inode2v9ses(inode);
837 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
838 if (IS_ERR(ptr: st))
839 return PTR_ERR(ptr: st);
840 /*
841 * Don't update inode if the file type is different
842 */
843 if (inode_wrong_type(inode, mode: st->st_mode))
844 goto out;
845
846 /*
847 * We don't want to refresh inode->i_size,
848 * because we may have cached data
849 */
850 flags = (v9ses->cache & CACHE_LOOSE) ?
851 V9FS_STAT2INODE_KEEP_ISIZE : 0;
852 v9fs_stat2inode_dotl(stat: st, inode, flags);
853out:
854 kfree(objp: st);
855 return 0;
856}
857
858const struct inode_operations v9fs_dir_inode_operations_dotl = {
859 .create = v9fs_vfs_create_dotl,
860 .atomic_open = v9fs_vfs_atomic_open_dotl,
861 .lookup = v9fs_vfs_lookup,
862 .link = v9fs_vfs_link_dotl,
863 .symlink = v9fs_vfs_symlink_dotl,
864 .unlink = v9fs_vfs_unlink,
865 .mkdir = v9fs_vfs_mkdir_dotl,
866 .rmdir = v9fs_vfs_rmdir,
867 .mknod = v9fs_vfs_mknod_dotl,
868 .rename = v9fs_vfs_rename,
869 .getattr = v9fs_vfs_getattr_dotl,
870 .setattr = v9fs_vfs_setattr_dotl,
871 .listxattr = v9fs_listxattr,
872 .get_inode_acl = v9fs_iop_get_inode_acl,
873 .get_acl = v9fs_iop_get_acl,
874 .set_acl = v9fs_iop_set_acl,
875};
876
877const struct inode_operations v9fs_file_inode_operations_dotl = {
878 .getattr = v9fs_vfs_getattr_dotl,
879 .setattr = v9fs_vfs_setattr_dotl,
880 .listxattr = v9fs_listxattr,
881 .get_inode_acl = v9fs_iop_get_inode_acl,
882 .get_acl = v9fs_iop_get_acl,
883 .set_acl = v9fs_iop_set_acl,
884};
885
886const struct inode_operations v9fs_symlink_inode_operations_dotl = {
887 .get_link = v9fs_vfs_get_link_dotl,
888 .getattr = v9fs_vfs_getattr_dotl,
889 .setattr = v9fs_vfs_setattr_dotl,
890 .listxattr = v9fs_listxattr,
891};
892

source code of linux/fs/9p/vfs_inode_dotl.c