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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[linux-stable.git] / fs / 9p / vfs_inode_dotl.c
blob143ac03b7425c0e589bc097dac8b070792ef8679
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
31 static int
32 v9fs_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
44 static 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
55 static int v9fs_test_inode_dotl(struct inode *inode, void *data)
56 {
57 struct v9fs_inode *v9inode = V9FS_I(inode);
58 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
59
60 /* don't match inode of different type */
61 if (inode_wrong_type(inode, st->st_mode))
62 return 0;
63
64 if (inode->i_generation != st->st_gen)
65 return 0;
66
67 /* compare qid details */
68 if (memcmp(&v9inode->qid.version,
69 &st->qid.version, sizeof(v9inode->qid.version)))
70 return 0;
71
72 if (v9inode->qid.type != st->qid.type)
73 return 0;
74
75 if (v9inode->qid.path != st->qid.path)
76 return 0;
77 return 1;
78 }
79
80 /* Always get a new inode */
81 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
82 {
83 return 0;
84 }
85
86 static int v9fs_set_inode_dotl(struct inode *inode, void *data)
87 {
88 struct v9fs_inode *v9inode = V9FS_I(inode);
89 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
90
91 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
92 inode->i_generation = st->st_gen;
93 return 0;
94 }
95
96 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
97 struct p9_qid *qid,
98 struct p9_fid *fid,
99 struct p9_stat_dotl *st,
100 int new)
101 {
102 int retval;
103 struct inode *inode;
104 struct v9fs_session_info *v9ses = sb->s_fs_info;
105 int (*test)(struct inode *inode, void *data);
106
107 if (new)
108 test = v9fs_test_new_inode_dotl;
109 else
110 test = v9fs_test_inode_dotl;
111
112 inode = iget5_locked(sb, QID2INO(qid), test, v9fs_set_inode_dotl, st);
113 if (!inode)
114 return ERR_PTR(-ENOMEM);
115 if (!(inode->i_state & I_NEW))
116 return inode;
117 /*
118 * initialize the inode with the stat info
119 * FIXME!! we may need support for stale inodes
120 * later.
121 */
122 inode->i_ino = QID2INO(qid);
123 retval = v9fs_init_inode(v9ses, inode,
124 st->st_mode, new_decode_dev(st->st_rdev));
125 if (retval)
126 goto error;
127
128 v9fs_stat2inode_dotl(st, inode, 0);
129 v9fs_set_netfs_context(inode);
130 v9fs_cache_inode_get_cookie(inode);
131 retval = v9fs_get_acl(inode, fid);
132 if (retval)
133 goto error;
134
135 unlock_new_inode(inode);
136 return inode;
137 error:
138 iget_failed(inode);
139 return ERR_PTR(retval);
140
141 }
142
143 struct inode *
144 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
145 struct super_block *sb, int new)
146 {
147 struct p9_stat_dotl *st;
148 struct inode *inode = NULL;
149
150 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
151 if (IS_ERR(st))
152 return ERR_CAST(st);
153
154 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
155 kfree(st);
156 return inode;
157 }
158
159 struct dotl_openflag_map {
160 int open_flag;
161 int dotl_flag;
162 };
163
164 static int v9fs_mapped_dotl_flags(int flags)
165 {
166 int i;
167 int rflags = 0;
168 struct dotl_openflag_map dotl_oflag_map[] = {
169 { O_CREAT, P9_DOTL_CREATE },
170 { O_EXCL, P9_DOTL_EXCL },
171 { O_NOCTTY, P9_DOTL_NOCTTY },
172 { O_APPEND, P9_DOTL_APPEND },
173 { O_NONBLOCK, P9_DOTL_NONBLOCK },
174 { O_DSYNC, P9_DOTL_DSYNC },
175 { FASYNC, P9_DOTL_FASYNC },
176 { O_DIRECT, P9_DOTL_DIRECT },
177 { O_LARGEFILE, P9_DOTL_LARGEFILE },
178 { O_DIRECTORY, P9_DOTL_DIRECTORY },
179 { O_NOFOLLOW, P9_DOTL_NOFOLLOW },
180 { O_NOATIME, P9_DOTL_NOATIME },
181 { O_CLOEXEC, P9_DOTL_CLOEXEC },
182 { O_SYNC, P9_DOTL_SYNC},
183 };
184 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
185 if (flags & dotl_oflag_map[i].open_flag)
186 rflags |= dotl_oflag_map[i].dotl_flag;
187 }
188 return rflags;
189 }
190
191 /**
192 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
193 * plan 9 open flag.
194 * @flags: flags to convert
195 */
196 int v9fs_open_to_dotl_flags(int flags)
197 {
198 int rflags = 0;
199
200 /*
201 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
202 * and P9_DOTL_NOACCESS
203 */
204 rflags |= flags & O_ACCMODE;
205 rflags |= v9fs_mapped_dotl_flags(flags);
206
207 return rflags;
208 }
209
210 /**
211 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
212 * @idmap: The user namespace of the mount
213 * @dir: directory inode that is being created
214 * @dentry: dentry that is being deleted
215 * @omode: create permissions
216 * @excl: True if the file must not yet exist
217 *
218 */
219 static int
220 v9fs_vfs_create_dotl(struct mnt_idmap *idmap, struct inode *dir,
221 struct dentry *dentry, umode_t omode, bool excl)
222 {
223 return v9fs_vfs_mknod_dotl(idmap, dir, dentry, omode, 0);
224 }
225
226 static int
227 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
228 struct file *file, unsigned int flags, umode_t omode)
229 {
230 int err = 0;
231 kgid_t gid;
232 umode_t mode;
233 int p9_omode = v9fs_open_to_dotl_flags(flags);
234 const unsigned char *name = NULL;
235 struct p9_qid qid;
236 struct inode *inode;
237 struct p9_fid *fid = NULL;
238 struct p9_fid *dfid = NULL, *ofid = NULL;
239 struct v9fs_session_info *v9ses;
240 struct posix_acl *pacl = NULL, *dacl = NULL;
241 struct dentry *res = NULL;
242
243 if (d_in_lookup(dentry)) {
244 res = v9fs_vfs_lookup(dir, dentry, 0);
245 if (IS_ERR(res))
246 return PTR_ERR(res);
247
248 if (res)
249 dentry = res;
250 }
251
252 /* Only creates */
253 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
254 return finish_no_open(file, res);
255
256 v9ses = v9fs_inode2v9ses(dir);
257
258 name = dentry->d_name.name;
259 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%x\n",
260 name, flags, omode);
261
262 dfid = v9fs_parent_fid(dentry);
263 if (IS_ERR(dfid)) {
264 err = PTR_ERR(dfid);
265 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
266 goto out;
267 }
268
269 /* clone a fid to use for creation */
270 ofid = clone_fid(dfid);
271 if (IS_ERR(ofid)) {
272 err = PTR_ERR(ofid);
273 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
274 goto out;
275 }
276
277 gid = v9fs_get_fsgid_for_create(dir);
278
279 mode = omode;
280 /* Update mode based on ACL value */
281 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
282 if (err) {
283 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in create %d\n",
284 err);
285 goto out;
286 }
287
288 if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) {
289 p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR;
290 p9_debug(P9_DEBUG_CACHE,
291 "write-only file with writeback enabled, creating w/ O_RDWR\n");
292 }
293 err = p9_client_create_dotl(ofid, name, p9_omode, mode, gid, &qid);
294 if (err < 0) {
295 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in create %d\n",
296 err);
297 goto out;
298 }
299 v9fs_invalidate_inode_attr(dir);
300
301 /* instantiate inode and assign the unopened fid to the dentry */
302 fid = p9_client_walk(dfid, 1, &name, 1);
303 if (IS_ERR(fid)) {
304 err = PTR_ERR(fid);
305 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
306 goto out;
307 }
308 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
309 if (IS_ERR(inode)) {
310 err = PTR_ERR(inode);
311 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
312 goto out;
313 }
314 /* Now set the ACL based on the default value */
315 v9fs_set_create_acl(inode, fid, dacl, pacl);
316
317 v9fs_fid_add(dentry, &fid);
318 d_instantiate(dentry, inode);
319
320 /* Since we are opening a file, assign the open fid to the file */
321 err = finish_open(file, dentry, generic_file_open);
322 if (err)
323 goto out;
324 file->private_data = ofid;
325 #ifdef CONFIG_9P_FSCACHE
326 if (v9ses->cache & CACHE_FSCACHE) {
327 struct v9fs_inode *v9inode = V9FS_I(inode);
328 fscache_use_cookie(v9fs_inode_cookie(v9inode),
329 file->f_mode & FMODE_WRITE);
330 }
331 #endif
332 v9fs_fid_add_modes(ofid, v9ses->flags, v9ses->cache, flags);
333 v9fs_open_fid_add(inode, &ofid);
334 file->f_mode |= FMODE_CREATED;
335 out:
336 p9_fid_put(dfid);
337 p9_fid_put(ofid);
338 p9_fid_put(fid);
339 v9fs_put_acl(dacl, pacl);
340 dput(res);
341 return err;
342 }
343
344 /**
345 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
346 * @idmap: The idmap of the mount
347 * @dir: inode that is being unlinked
348 * @dentry: dentry that is being unlinked
349 * @omode: mode for new directory
350 *
351 */
352
353 static int v9fs_vfs_mkdir_dotl(struct mnt_idmap *idmap,
354 struct inode *dir, struct dentry *dentry,
355 umode_t omode)
356 {
357 int err;
358 struct v9fs_session_info *v9ses;
359 struct p9_fid *fid = NULL, *dfid = NULL;
360 kgid_t gid;
361 const unsigned char *name;
362 umode_t mode;
363 struct inode *inode;
364 struct p9_qid qid;
365 struct posix_acl *dacl = NULL, *pacl = NULL;
366
367 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
368 v9ses = v9fs_inode2v9ses(dir);
369
370 omode |= S_IFDIR;
371 if (dir->i_mode & S_ISGID)
372 omode |= S_ISGID;
373
374 dfid = v9fs_parent_fid(dentry);
375 if (IS_ERR(dfid)) {
376 err = PTR_ERR(dfid);
377 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
378 goto error;
379 }
380
381 gid = v9fs_get_fsgid_for_create(dir);
382 mode = omode;
383 /* Update mode based on ACL value */
384 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
385 if (err) {
386 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
387 err);
388 goto error;
389 }
390 name = dentry->d_name.name;
391 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
392 if (err < 0)
393 goto error;
394 fid = p9_client_walk(dfid, 1, &name, 1);
395 if (IS_ERR(fid)) {
396 err = PTR_ERR(fid);
397 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
398 err);
399 goto error;
400 }
401
402 /* instantiate inode and assign the unopened fid to the dentry */
403 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
404 if (IS_ERR(inode)) {
405 err = PTR_ERR(inode);
406 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
407 err);
408 goto error;
409 }
410 v9fs_fid_add(dentry, &fid);
411 v9fs_set_create_acl(inode, fid, dacl, pacl);
412 d_instantiate(dentry, inode);
413 err = 0;
414 inc_nlink(dir);
415 v9fs_invalidate_inode_attr(dir);
416 error:
417 p9_fid_put(fid);
418 v9fs_put_acl(dacl, pacl);
419 p9_fid_put(dfid);
420 return err;
421 }
422
423 static int
424 v9fs_vfs_getattr_dotl(struct mnt_idmap *idmap,
425 const struct path *path, struct kstat *stat,
426 u32 request_mask, unsigned int flags)
427 {
428 struct dentry *dentry = path->dentry;
429 struct v9fs_session_info *v9ses;
430 struct p9_fid *fid;
431 struct inode *inode = d_inode(dentry);
432 struct p9_stat_dotl *st;
433
434 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
435 v9ses = v9fs_dentry2v9ses(dentry);
436 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
437 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
438 return 0;
439 } else if (v9ses->cache) {
440 if (S_ISREG(inode->i_mode)) {
441 int retval = filemap_fdatawrite(inode->i_mapping);
442
443 if (retval)
444 p9_debug(P9_DEBUG_ERROR,
445 "flushing writeback during getattr returned %d\n", retval);
446 }
447 }
448 fid = v9fs_fid_lookup(dentry);
449 if (IS_ERR(fid))
450 return PTR_ERR(fid);
451
452 /* Ask for all the fields in stat structure. Server will return
453 * whatever it supports
454 */
455
456 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
457 p9_fid_put(fid);
458 if (IS_ERR(st))
459 return PTR_ERR(st);
460
461 v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
462 generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat);
463 /* Change block size to what the server returned */
464 stat->blksize = st->st_blksize;
465
466 kfree(st);
467 return 0;
468 }
469
470 /*
471 * Attribute flags.
472 */
473 #define P9_ATTR_MODE (1 << 0)
474 #define P9_ATTR_UID (1 << 1)
475 #define P9_ATTR_GID (1 << 2)
476 #define P9_ATTR_SIZE (1 << 3)
477 #define P9_ATTR_ATIME (1 << 4)
478 #define P9_ATTR_MTIME (1 << 5)
479 #define P9_ATTR_CTIME (1 << 6)
480 #define P9_ATTR_ATIME_SET (1 << 7)
481 #define P9_ATTR_MTIME_SET (1 << 8)
482
483 struct dotl_iattr_map {
484 int iattr_valid;
485 int p9_iattr_valid;
486 };
487
488 static int v9fs_mapped_iattr_valid(int iattr_valid)
489 {
490 int i;
491 int p9_iattr_valid = 0;
492 struct dotl_iattr_map dotl_iattr_map[] = {
493 { ATTR_MODE, P9_ATTR_MODE },
494 { ATTR_UID, P9_ATTR_UID },
495 { ATTR_GID, P9_ATTR_GID },
496 { ATTR_SIZE, P9_ATTR_SIZE },
497 { ATTR_ATIME, P9_ATTR_ATIME },
498 { ATTR_MTIME, P9_ATTR_MTIME },
499 { ATTR_CTIME, P9_ATTR_CTIME },
500 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET },
501 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET },
502 };
503 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
504 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
505 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
506 }
507 return p9_iattr_valid;
508 }
509
510 /**
511 * v9fs_vfs_setattr_dotl - set file metadata
512 * @idmap: idmap of the mount
513 * @dentry: file whose metadata to set
514 * @iattr: metadata assignment structure
515 *
516 */
517
518 int v9fs_vfs_setattr_dotl(struct mnt_idmap *idmap,
519 struct dentry *dentry, struct iattr *iattr)
520 {
521 int retval, use_dentry = 0;
522 struct inode *inode = d_inode(dentry);
523 struct v9fs_session_info __maybe_unused *v9ses;
524 struct p9_fid *fid = NULL;
525 struct p9_iattr_dotl p9attr = {
526 .uid = INVALID_UID,
527 .gid = INVALID_GID,
528 };
529
530 p9_debug(P9_DEBUG_VFS, "\n");
531
532 retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
533 if (retval)
534 return retval;
535
536 v9ses = v9fs_dentry2v9ses(dentry);
537
538 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
539 if (iattr->ia_valid & ATTR_MODE)
540 p9attr.mode = iattr->ia_mode;
541 if (iattr->ia_valid & ATTR_UID)
542 p9attr.uid = iattr->ia_uid;
543 if (iattr->ia_valid & ATTR_GID)
544 p9attr.gid = iattr->ia_gid;
545 if (iattr->ia_valid & ATTR_SIZE)
546 p9attr.size = iattr->ia_size;
547 if (iattr->ia_valid & ATTR_ATIME_SET) {
548 p9attr.atime_sec = iattr->ia_atime.tv_sec;
549 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
550 }
551 if (iattr->ia_valid & ATTR_MTIME_SET) {
552 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
553 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
554 }
555
556 if (iattr->ia_valid & ATTR_FILE) {
557 fid = iattr->ia_file->private_data;
558 WARN_ON(!fid);
559 }
560 if (!fid) {
561 fid = v9fs_fid_lookup(dentry);
562 use_dentry = 1;
563 }
564 if (IS_ERR(fid))
565 return PTR_ERR(fid);
566
567 /* Write all dirty data */
568 if (S_ISREG(inode->i_mode)) {
569 retval = filemap_fdatawrite(inode->i_mapping);
570 if (retval < 0)
571 p9_debug(P9_DEBUG_ERROR,
572 "Flushing file prior to setattr failed: %d\n", retval);
573 }
574
575 retval = p9_client_setattr(fid, &p9attr);
576 if (retval < 0) {
577 if (use_dentry)
578 p9_fid_put(fid);
579 return retval;
580 }
581
582 if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size !=
583 i_size_read(inode)) {
584 truncate_setsize(inode, iattr->ia_size);
585 netfs_resize_file(netfs_inode(inode), iattr->ia_size, true);
586
587 #ifdef CONFIG_9P_FSCACHE
588 if (v9ses->cache & CACHE_FSCACHE)
589 fscache_resize_cookie(v9fs_inode_cookie(V9FS_I(inode)),
590 iattr->ia_size);
591 #endif
592 }
593
594 v9fs_invalidate_inode_attr(inode);
595 setattr_copy(&nop_mnt_idmap, inode, iattr);
596 mark_inode_dirty(inode);
597 if (iattr->ia_valid & ATTR_MODE) {
598 /* We also want to update ACL when we update mode bits */
599 retval = v9fs_acl_chmod(inode, fid);
600 if (retval < 0) {
601 if (use_dentry)
602 p9_fid_put(fid);
603 return retval;
604 }
605 }
606 if (use_dentry)
607 p9_fid_put(fid);
608
609 return 0;
610 }
611
612 /**
613 * v9fs_stat2inode_dotl - populate an inode structure with stat info
614 * @stat: stat structure
615 * @inode: inode to populate
616 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
617 *
618 */
619
620 void
621 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
622 unsigned int flags)
623 {
624 umode_t mode;
625 struct v9fs_inode *v9inode = V9FS_I(inode);
626
627 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
628 inode_set_atime(inode, stat->st_atime_sec,
629 stat->st_atime_nsec);
630 inode_set_mtime(inode, stat->st_mtime_sec,
631 stat->st_mtime_nsec);
632 inode_set_ctime(inode, stat->st_ctime_sec,
633 stat->st_ctime_nsec);
634 inode->i_uid = stat->st_uid;
635 inode->i_gid = stat->st_gid;
636 set_nlink(inode, stat->st_nlink);
637
638 mode = stat->st_mode & S_IALLUGO;
639 mode |= inode->i_mode & ~S_IALLUGO;
640 inode->i_mode = mode;
641
642 v9inode->netfs.remote_i_size = stat->st_size;
643 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
644 v9fs_i_size_write(inode, stat->st_size);
645 inode->i_blocks = stat->st_blocks;
646 } else {
647 if (stat->st_result_mask & P9_STATS_ATIME) {
648 inode_set_atime(inode, stat->st_atime_sec,
649 stat->st_atime_nsec);
650 }
651 if (stat->st_result_mask & P9_STATS_MTIME) {
652 inode_set_mtime(inode, stat->st_mtime_sec,
653 stat->st_mtime_nsec);
654 }
655 if (stat->st_result_mask & P9_STATS_CTIME) {
656 inode_set_ctime(inode, stat->st_ctime_sec,
657 stat->st_ctime_nsec);
658 }
659 if (stat->st_result_mask & P9_STATS_UID)
660 inode->i_uid = stat->st_uid;
661 if (stat->st_result_mask & P9_STATS_GID)
662 inode->i_gid = stat->st_gid;
663 if (stat->st_result_mask & P9_STATS_NLINK)
664 set_nlink(inode, stat->st_nlink);
665 if (stat->st_result_mask & P9_STATS_MODE) {
666 mode = stat->st_mode & S_IALLUGO;
667 mode |= inode->i_mode & ~S_IALLUGO;
668 inode->i_mode = mode;
669 }
670 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
671 stat->st_result_mask & P9_STATS_SIZE) {
672 v9inode->netfs.remote_i_size = stat->st_size;
673 v9fs_i_size_write(inode, stat->st_size);
674 }
675 if (stat->st_result_mask & P9_STATS_BLOCKS)
676 inode->i_blocks = stat->st_blocks;
677 }
678 if (stat->st_result_mask & P9_STATS_GEN)
679 inode->i_generation = stat->st_gen;
680
681 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
682 * because the inode structure does not have fields for them.
683 */
684 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
685 }
686
687 static int
688 v9fs_vfs_symlink_dotl(struct mnt_idmap *idmap, struct inode *dir,
689 struct dentry *dentry, const char *symname)
690 {
691 int err;
692 kgid_t gid;
693 const unsigned char *name;
694 struct p9_qid qid;
695 struct p9_fid *dfid;
696 struct p9_fid *fid = NULL;
697
698 name = dentry->d_name.name;
699 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
700
701 dfid = v9fs_parent_fid(dentry);
702 if (IS_ERR(dfid)) {
703 err = PTR_ERR(dfid);
704 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
705 return err;
706 }
707
708 gid = v9fs_get_fsgid_for_create(dir);
709
710 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
711 err = p9_client_symlink(dfid, name, symname, gid, &qid);
712
713 if (err < 0) {
714 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
715 goto error;
716 }
717
718 v9fs_invalidate_inode_attr(dir);
719
720 error:
721 p9_fid_put(fid);
722 p9_fid_put(dfid);
723 return err;
724 }
725
726 /**
727 * v9fs_vfs_link_dotl - create a hardlink for dotl
728 * @old_dentry: dentry for file to link to
729 * @dir: inode destination for new link
730 * @dentry: dentry for link
731 *
732 */
733
734 static int
735 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
736 struct dentry *dentry)
737 {
738 int err;
739 struct p9_fid *dfid, *oldfid;
740 struct v9fs_session_info *v9ses;
741
742 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
743 dir->i_ino, old_dentry, dentry);
744
745 v9ses = v9fs_inode2v9ses(dir);
746 dfid = v9fs_parent_fid(dentry);
747 if (IS_ERR(dfid))
748 return PTR_ERR(dfid);
749
750 oldfid = v9fs_fid_lookup(old_dentry);
751 if (IS_ERR(oldfid)) {
752 p9_fid_put(dfid);
753 return PTR_ERR(oldfid);
754 }
755
756 err = p9_client_link(dfid, oldfid, dentry->d_name.name);
757
758 p9_fid_put(dfid);
759 p9_fid_put(oldfid);
760 if (err < 0) {
761 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
762 return err;
763 }
764
765 v9fs_invalidate_inode_attr(dir);
766 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
767 /* Get the latest stat info from server. */
768 struct p9_fid *fid;
769
770 fid = v9fs_fid_lookup(old_dentry);
771 if (IS_ERR(fid))
772 return PTR_ERR(fid);
773
774 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
775 p9_fid_put(fid);
776 }
777 ihold(d_inode(old_dentry));
778 d_instantiate(dentry, d_inode(old_dentry));
779
780 return err;
781 }
782
783 /**
784 * v9fs_vfs_mknod_dotl - create a special file
785 * @idmap: The idmap of the mount
786 * @dir: inode destination for new link
787 * @dentry: dentry for file
788 * @omode: mode for creation
789 * @rdev: device associated with special file
790 *
791 */
792 static int
793 v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir,
794 struct dentry *dentry, umode_t omode, dev_t rdev)
795 {
796 int err;
797 kgid_t gid;
798 const unsigned char *name;
799 umode_t mode;
800 struct v9fs_session_info *v9ses;
801 struct p9_fid *fid = NULL, *dfid = NULL;
802 struct inode *inode;
803 struct p9_qid qid;
804 struct posix_acl *dacl = NULL, *pacl = NULL;
805
806 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
807 dir->i_ino, dentry, omode,
808 MAJOR(rdev), MINOR(rdev));
809
810 v9ses = v9fs_inode2v9ses(dir);
811 dfid = v9fs_parent_fid(dentry);
812 if (IS_ERR(dfid)) {
813 err = PTR_ERR(dfid);
814 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
815 goto error;
816 }
817
818 gid = v9fs_get_fsgid_for_create(dir);
819 mode = omode;
820 /* Update mode based on ACL value */
821 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
822 if (err) {
823 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
824 err);
825 goto error;
826 }
827 name = dentry->d_name.name;
828
829 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
830 if (err < 0)
831 goto error;
832
833 v9fs_invalidate_inode_attr(dir);
834 fid = p9_client_walk(dfid, 1, &name, 1);
835 if (IS_ERR(fid)) {
836 err = PTR_ERR(fid);
837 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
838 err);
839 goto error;
840 }
841 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
842 if (IS_ERR(inode)) {
843 err = PTR_ERR(inode);
844 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
845 err);
846 goto error;
847 }
848 v9fs_set_create_acl(inode, fid, dacl, pacl);
849 v9fs_fid_add(dentry, &fid);
850 d_instantiate(dentry, inode);
851 err = 0;
852 error:
853 p9_fid_put(fid);
854 v9fs_put_acl(dacl, pacl);
855 p9_fid_put(dfid);
856
857 return err;
858 }
859
860 /**
861 * v9fs_vfs_get_link_dotl - follow a symlink path
862 * @dentry: dentry for symlink
863 * @inode: inode for symlink
864 * @done: destructor for return value
865 */
866
867 static const char *
868 v9fs_vfs_get_link_dotl(struct dentry *dentry,
869 struct inode *inode,
870 struct delayed_call *done)
871 {
872 struct p9_fid *fid;
873 char *target;
874 int retval;
875
876 if (!dentry)
877 return ERR_PTR(-ECHILD);
878
879 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
880
881 fid = v9fs_fid_lookup(dentry);
882 if (IS_ERR(fid))
883 return ERR_CAST(fid);
884 retval = p9_client_readlink(fid, &target);
885 p9_fid_put(fid);
886 if (retval)
887 return ERR_PTR(retval);
888 set_delayed_call(done, kfree_link, target);
889 return target;
890 }
891
892 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
893 {
894 struct p9_stat_dotl *st;
895 struct v9fs_session_info *v9ses;
896 unsigned int flags;
897
898 v9ses = v9fs_inode2v9ses(inode);
899 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
900 if (IS_ERR(st))
901 return PTR_ERR(st);
902 /*
903 * Don't update inode if the file type is different
904 */
905 if (inode_wrong_type(inode, st->st_mode))
906 goto out;
907
908 /*
909 * We don't want to refresh inode->i_size,
910 * because we may have cached data
911 */
912 flags = (v9ses->cache & CACHE_LOOSE) ?
913 V9FS_STAT2INODE_KEEP_ISIZE : 0;
914 v9fs_stat2inode_dotl(st, inode, flags);
915 out:
916 kfree(st);
917 return 0;
918 }
919
920 const struct inode_operations v9fs_dir_inode_operations_dotl = {
921 .create = v9fs_vfs_create_dotl,
922 .atomic_open = v9fs_vfs_atomic_open_dotl,
923 .lookup = v9fs_vfs_lookup,
924 .link = v9fs_vfs_link_dotl,
925 .symlink = v9fs_vfs_symlink_dotl,
926 .unlink = v9fs_vfs_unlink,
927 .mkdir = v9fs_vfs_mkdir_dotl,
928 .rmdir = v9fs_vfs_rmdir,
929 .mknod = v9fs_vfs_mknod_dotl,
930 .rename = v9fs_vfs_rename,
931 .getattr = v9fs_vfs_getattr_dotl,
932 .setattr = v9fs_vfs_setattr_dotl,
933 .listxattr = v9fs_listxattr,
934 .get_inode_acl = v9fs_iop_get_inode_acl,
935 .get_acl = v9fs_iop_get_acl,
936 .set_acl = v9fs_iop_set_acl,
937 };
938
939 const struct inode_operations v9fs_file_inode_operations_dotl = {
940 .getattr = v9fs_vfs_getattr_dotl,
941 .setattr = v9fs_vfs_setattr_dotl,
942 .listxattr = v9fs_listxattr,
943 .get_inode_acl = v9fs_iop_get_inode_acl,
944 .get_acl = v9fs_iop_get_acl,
945 .set_acl = v9fs_iop_set_acl,
946 };
947
948 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
949 .get_link = v9fs_vfs_get_link_dotl,
950 .getattr = v9fs_vfs_getattr_dotl,
951 .setattr = v9fs_vfs_setattr_dotl,
952 .listxattr = v9fs_listxattr,
953 };
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