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Avoid beyond bounds copy while caching ACL
[zen-stable.git] / fs / 9p / vfs_inode_dotl.c
bloba1e6c990cd410efded55c826f03bc5db13839d75
1 /*
2 * linux/fs/9p/vfs_inode_dotl.c
3 *
4 * This file contains vfs inode ops for the 9P2000.L protocol.
5 *
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26 #include <linux/module.h>
27 #include <linux/errno.h>
28 #include <linux/fs.h>
29 #include <linux/file.h>
30 #include <linux/pagemap.h>
31 #include <linux/stat.h>
32 #include <linux/string.h>
33 #include <linux/inet.h>
34 #include <linux/namei.h>
35 #include <linux/idr.h>
36 #include <linux/sched.h>
37 #include <linux/slab.h>
38 #include <linux/xattr.h>
39 #include <linux/posix_acl.h>
40 #include <net/9p/9p.h>
41 #include <net/9p/client.h>
42
43 #include "v9fs.h"
44 #include "v9fs_vfs.h"
45 #include "fid.h"
46 #include "cache.h"
47 #include "xattr.h"
48 #include "acl.h"
49
50 static int
51 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
52 dev_t rdev);
53
54 /**
55 * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
56 * new file system object. This checks the S_ISGID to determine the owning
57 * group of the new file system object.
58 */
59
60 static gid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
61 {
62 BUG_ON(dir_inode == NULL);
63
64 if (dir_inode->i_mode & S_ISGID) {
65 /* set_gid bit is set.*/
66 return dir_inode->i_gid;
67 }
68 return current_fsgid();
69 }
70
71 /**
72 * v9fs_dentry_from_dir_inode - helper function to get the dentry from
73 * dir inode.
74 *
75 */
76
77 static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode)
78 {
79 struct dentry *dentry;
80
81 spin_lock(&inode->i_lock);
82 /* Directory should have only one entry. */
83 BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry));
84 dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias);
85 spin_unlock(&inode->i_lock);
86 return dentry;
87 }
88
89 static int v9fs_test_inode_dotl(struct inode *inode, void *data)
90 {
91 struct v9fs_inode *v9inode = V9FS_I(inode);
92 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
93
94 /* don't match inode of different type */
95 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
96 return 0;
97
98 if (inode->i_generation != st->st_gen)
99 return 0;
100
101 /* compare qid details */
102 if (memcmp(&v9inode->qid.version,
103 &st->qid.version, sizeof(v9inode->qid.version)))
104 return 0;
105
106 if (v9inode->qid.type != st->qid.type)
107 return 0;
108 return 1;
109 }
110
111 /* Always get a new inode */
112 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
113 {
114 return 0;
115 }
116
117 static int v9fs_set_inode_dotl(struct inode *inode, void *data)
118 {
119 struct v9fs_inode *v9inode = V9FS_I(inode);
120 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
121
122 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
123 inode->i_generation = st->st_gen;
124 return 0;
125 }
126
127 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
128 struct p9_qid *qid,
129 struct p9_fid *fid,
130 struct p9_stat_dotl *st,
131 int new)
132 {
133 int retval;
134 unsigned long i_ino;
135 struct inode *inode;
136 struct v9fs_session_info *v9ses = sb->s_fs_info;
137 int (*test)(struct inode *, void *);
138
139 if (new)
140 test = v9fs_test_new_inode_dotl;
141 else
142 test = v9fs_test_inode_dotl;
143
144 i_ino = v9fs_qid2ino(qid);
145 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
146 if (!inode)
147 return ERR_PTR(-ENOMEM);
148 if (!(inode->i_state & I_NEW))
149 return inode;
150 /*
151 * initialize the inode with the stat info
152 * FIXME!! we may need support for stale inodes
153 * later.
154 */
155 inode->i_ino = i_ino;
156 retval = v9fs_init_inode(v9ses, inode,
157 st->st_mode, new_decode_dev(st->st_rdev));
158 if (retval)
159 goto error;
160
161 v9fs_stat2inode_dotl(st, inode);
162 #ifdef CONFIG_9P_FSCACHE
163 v9fs_cache_inode_get_cookie(inode);
164 #endif
165 retval = v9fs_get_acl(inode, fid);
166 if (retval)
167 goto error;
168
169 unlock_new_inode(inode);
170 return inode;
171 error:
172 unlock_new_inode(inode);
173 iput(inode);
174 return ERR_PTR(retval);
175
176 }
177
178 struct inode *
179 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
180 struct super_block *sb, int new)
181 {
182 struct p9_stat_dotl *st;
183 struct inode *inode = NULL;
184
185 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
186 if (IS_ERR(st))
187 return ERR_CAST(st);
188
189 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
190 kfree(st);
191 return inode;
192 }
193
194 struct dotl_openflag_map {
195 int open_flag;
196 int dotl_flag;
197 };
198
199 static int v9fs_mapped_dotl_flags(int flags)
200 {
201 int i;
202 int rflags = 0;
203 struct dotl_openflag_map dotl_oflag_map[] = {
204 { O_CREAT, P9_DOTL_CREATE },
205 { O_EXCL, P9_DOTL_EXCL },
206 { O_NOCTTY, P9_DOTL_NOCTTY },
207 { O_TRUNC, P9_DOTL_TRUNC },
208 { O_APPEND, P9_DOTL_APPEND },
209 { O_NONBLOCK, P9_DOTL_NONBLOCK },
210 { O_DSYNC, P9_DOTL_DSYNC },
211 { FASYNC, P9_DOTL_FASYNC },
212 { O_DIRECT, P9_DOTL_DIRECT },
213 { O_LARGEFILE, P9_DOTL_LARGEFILE },
214 { O_DIRECTORY, P9_DOTL_DIRECTORY },
215 { O_NOFOLLOW, P9_DOTL_NOFOLLOW },
216 { O_NOATIME, P9_DOTL_NOATIME },
217 { O_CLOEXEC, P9_DOTL_CLOEXEC },
218 { O_SYNC, P9_DOTL_SYNC},
219 };
220 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
221 if (flags & dotl_oflag_map[i].open_flag)
222 rflags |= dotl_oflag_map[i].dotl_flag;
223 }
224 return rflags;
225 }
226
227 /**
228 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
229 * plan 9 open flag.
230 * @flags: flags to convert
231 */
232 int v9fs_open_to_dotl_flags(int flags)
233 {
234 int rflags = 0;
235
236 /*
237 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
238 * and P9_DOTL_NOACCESS
239 */
240 rflags |= flags & O_ACCMODE;
241 rflags |= v9fs_mapped_dotl_flags(flags);
242
243 return rflags;
244 }
245
246 /**
247 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
248 * @dir: directory inode that is being created
249 * @dentry: dentry that is being deleted
250 * @mode: create permissions
251 * @nd: path information
252 *
253 */
254
255 static int
256 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
257 struct nameidata *nd)
258 {
259 int err = 0;
260 gid_t gid;
261 int flags;
262 umode_t mode;
263 char *name = NULL;
264 struct file *filp;
265 struct p9_qid qid;
266 struct inode *inode;
267 struct p9_fid *fid = NULL;
268 struct v9fs_inode *v9inode;
269 struct p9_fid *dfid, *ofid, *inode_fid;
270 struct v9fs_session_info *v9ses;
271 struct posix_acl *pacl = NULL, *dacl = NULL;
272
273 v9ses = v9fs_inode2v9ses(dir);
274 if (nd)
275 flags = nd->intent.open.flags;
276 else {
277 /*
278 * create call without LOOKUP_OPEN is due
279 * to mknod of regular files. So use mknod
280 * operation.
281 */
282 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
283 }
284
285 name = (char *) dentry->d_name.name;
286 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
287 name, flags, omode);
288
289 dfid = v9fs_fid_lookup(dentry->d_parent);
290 if (IS_ERR(dfid)) {
291 err = PTR_ERR(dfid);
292 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
293 return err;
294 }
295
296 /* clone a fid to use for creation */
297 ofid = p9_client_walk(dfid, 0, NULL, 1);
298 if (IS_ERR(ofid)) {
299 err = PTR_ERR(ofid);
300 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
301 return err;
302 }
303
304 gid = v9fs_get_fsgid_for_create(dir);
305
306 mode = omode;
307 /* Update mode based on ACL value */
308 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
309 if (err) {
310 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
311 err);
312 goto error;
313 }
314 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
315 mode, gid, &qid);
316 if (err < 0) {
317 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
318 err);
319 goto error;
320 }
321 v9fs_invalidate_inode_attr(dir);
322
323 /* instantiate inode and assign the unopened fid to the dentry */
324 fid = p9_client_walk(dfid, 1, &name, 1);
325 if (IS_ERR(fid)) {
326 err = PTR_ERR(fid);
327 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
328 fid = NULL;
329 goto error;
330 }
331 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
332 if (IS_ERR(inode)) {
333 err = PTR_ERR(inode);
334 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
335 goto error;
336 }
337 err = v9fs_fid_add(dentry, fid);
338 if (err < 0)
339 goto error;
340 d_instantiate(dentry, inode);
341
342 /* Now set the ACL based on the default value */
343 v9fs_set_create_acl(dentry, &dacl, &pacl);
344
345 v9inode = V9FS_I(inode);
346 mutex_lock(&v9inode->v_mutex);
347 if (v9ses->cache && !v9inode->writeback_fid &&
348 ((flags & O_ACCMODE) != O_RDONLY)) {
349 /*
350 * clone a fid and add it to writeback_fid
351 * we do it during open time instead of
352 * page dirty time via write_begin/page_mkwrite
353 * because we want write after unlink usecase
354 * to work.
355 */
356 inode_fid = v9fs_writeback_fid(dentry);
357 if (IS_ERR(inode_fid)) {
358 err = PTR_ERR(inode_fid);
359 mutex_unlock(&v9inode->v_mutex);
360 goto err_clunk_old_fid;
361 }
362 v9inode->writeback_fid = (void *) inode_fid;
363 }
364 mutex_unlock(&v9inode->v_mutex);
365 /* Since we are opening a file, assign the open fid to the file */
366 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
367 if (IS_ERR(filp)) {
368 err = PTR_ERR(filp);
369 goto err_clunk_old_fid;
370 }
371 filp->private_data = ofid;
372 #ifdef CONFIG_9P_FSCACHE
373 if (v9ses->cache)
374 v9fs_cache_inode_set_cookie(inode, filp);
375 #endif
376 return 0;
377
378 error:
379 if (fid)
380 p9_client_clunk(fid);
381 err_clunk_old_fid:
382 if (ofid)
383 p9_client_clunk(ofid);
384 v9fs_set_create_acl(NULL, &dacl, &pacl);
385 return err;
386 }
387
388 /**
389 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
390 * @dir: inode that is being unlinked
391 * @dentry: dentry that is being unlinked
392 * @mode: mode for new directory
393 *
394 */
395
396 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
397 struct dentry *dentry, umode_t omode)
398 {
399 int err;
400 struct v9fs_session_info *v9ses;
401 struct p9_fid *fid = NULL, *dfid = NULL;
402 gid_t gid;
403 char *name;
404 umode_t mode;
405 struct inode *inode;
406 struct p9_qid qid;
407 struct dentry *dir_dentry;
408 struct posix_acl *dacl = NULL, *pacl = NULL;
409
410 p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
411 err = 0;
412 v9ses = v9fs_inode2v9ses(dir);
413
414 omode |= S_IFDIR;
415 if (dir->i_mode & S_ISGID)
416 omode |= S_ISGID;
417
418 dir_dentry = v9fs_dentry_from_dir_inode(dir);
419 dfid = v9fs_fid_lookup(dir_dentry);
420 if (IS_ERR(dfid)) {
421 err = PTR_ERR(dfid);
422 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
423 dfid = NULL;
424 goto error;
425 }
426
427 gid = v9fs_get_fsgid_for_create(dir);
428 mode = omode;
429 /* Update mode based on ACL value */
430 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
431 if (err) {
432 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
433 err);
434 goto error;
435 }
436 name = (char *) dentry->d_name.name;
437 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
438 if (err < 0)
439 goto error;
440
441 /* instantiate inode and assign the unopened fid to the dentry */
442 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
443 fid = p9_client_walk(dfid, 1, &name, 1);
444 if (IS_ERR(fid)) {
445 err = PTR_ERR(fid);
446 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
447 err);
448 fid = NULL;
449 goto error;
450 }
451
452 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
453 if (IS_ERR(inode)) {
454 err = PTR_ERR(inode);
455 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
456 err);
457 goto error;
458 }
459 err = v9fs_fid_add(dentry, fid);
460 if (err < 0)
461 goto error;
462 d_instantiate(dentry, inode);
463 fid = NULL;
464 } else {
465 /*
466 * Not in cached mode. No need to populate
467 * inode with stat. We need to get an inode
468 * so that we can set the acl with dentry
469 */
470 inode = v9fs_get_inode(dir->i_sb, mode, 0);
471 if (IS_ERR(inode)) {
472 err = PTR_ERR(inode);
473 goto error;
474 }
475 d_instantiate(dentry, inode);
476 }
477 /* Now set the ACL based on the default value */
478 v9fs_set_create_acl(dentry, &dacl, &pacl);
479 inc_nlink(dir);
480 v9fs_invalidate_inode_attr(dir);
481 error:
482 if (fid)
483 p9_client_clunk(fid);
484 v9fs_set_create_acl(NULL, &dacl, &pacl);
485 return err;
486 }
487
488 static int
489 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
490 struct kstat *stat)
491 {
492 int err;
493 struct v9fs_session_info *v9ses;
494 struct p9_fid *fid;
495 struct p9_stat_dotl *st;
496
497 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
498 err = -EPERM;
499 v9ses = v9fs_dentry2v9ses(dentry);
500 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
501 generic_fillattr(dentry->d_inode, stat);
502 return 0;
503 }
504 fid = v9fs_fid_lookup(dentry);
505 if (IS_ERR(fid))
506 return PTR_ERR(fid);
507
508 /* Ask for all the fields in stat structure. Server will return
509 * whatever it supports
510 */
511
512 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
513 if (IS_ERR(st))
514 return PTR_ERR(st);
515
516 v9fs_stat2inode_dotl(st, dentry->d_inode);
517 generic_fillattr(dentry->d_inode, stat);
518 /* Change block size to what the server returned */
519 stat->blksize = st->st_blksize;
520
521 kfree(st);
522 return 0;
523 }
524
525 /*
526 * Attribute flags.
527 */
528 #define P9_ATTR_MODE (1 << 0)
529 #define P9_ATTR_UID (1 << 1)
530 #define P9_ATTR_GID (1 << 2)
531 #define P9_ATTR_SIZE (1 << 3)
532 #define P9_ATTR_ATIME (1 << 4)
533 #define P9_ATTR_MTIME (1 << 5)
534 #define P9_ATTR_CTIME (1 << 6)
535 #define P9_ATTR_ATIME_SET (1 << 7)
536 #define P9_ATTR_MTIME_SET (1 << 8)
537
538 struct dotl_iattr_map {
539 int iattr_valid;
540 int p9_iattr_valid;
541 };
542
543 static int v9fs_mapped_iattr_valid(int iattr_valid)
544 {
545 int i;
546 int p9_iattr_valid = 0;
547 struct dotl_iattr_map dotl_iattr_map[] = {
548 { ATTR_MODE, P9_ATTR_MODE },
549 { ATTR_UID, P9_ATTR_UID },
550 { ATTR_GID, P9_ATTR_GID },
551 { ATTR_SIZE, P9_ATTR_SIZE },
552 { ATTR_ATIME, P9_ATTR_ATIME },
553 { ATTR_MTIME, P9_ATTR_MTIME },
554 { ATTR_CTIME, P9_ATTR_CTIME },
555 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET },
556 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET },
557 };
558 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
559 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
560 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
561 }
562 return p9_iattr_valid;
563 }
564
565 /**
566 * v9fs_vfs_setattr_dotl - set file metadata
567 * @dentry: file whose metadata to set
568 * @iattr: metadata assignment structure
569 *
570 */
571
572 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
573 {
574 int retval;
575 struct v9fs_session_info *v9ses;
576 struct p9_fid *fid;
577 struct p9_iattr_dotl p9attr;
578
579 p9_debug(P9_DEBUG_VFS, "\n");
580
581 retval = inode_change_ok(dentry->d_inode, iattr);
582 if (retval)
583 return retval;
584
585 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
586 p9attr.mode = iattr->ia_mode;
587 p9attr.uid = iattr->ia_uid;
588 p9attr.gid = iattr->ia_gid;
589 p9attr.size = iattr->ia_size;
590 p9attr.atime_sec = iattr->ia_atime.tv_sec;
591 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
592 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
593 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
594
595 retval = -EPERM;
596 v9ses = v9fs_dentry2v9ses(dentry);
597 fid = v9fs_fid_lookup(dentry);
598 if (IS_ERR(fid))
599 return PTR_ERR(fid);
600
601 /* Write all dirty data */
602 if (S_ISREG(dentry->d_inode->i_mode))
603 filemap_write_and_wait(dentry->d_inode->i_mapping);
604
605 retval = p9_client_setattr(fid, &p9attr);
606 if (retval < 0)
607 return retval;
608
609 if ((iattr->ia_valid & ATTR_SIZE) &&
610 iattr->ia_size != i_size_read(dentry->d_inode))
611 truncate_setsize(dentry->d_inode, iattr->ia_size);
612
613 v9fs_invalidate_inode_attr(dentry->d_inode);
614 setattr_copy(dentry->d_inode, iattr);
615 mark_inode_dirty(dentry->d_inode);
616 if (iattr->ia_valid & ATTR_MODE) {
617 /* We also want to update ACL when we update mode bits */
618 retval = v9fs_acl_chmod(dentry);
619 if (retval < 0)
620 return retval;
621 }
622 return 0;
623 }
624
625 /**
626 * v9fs_stat2inode_dotl - populate an inode structure with stat info
627 * @stat: stat structure
628 * @inode: inode to populate
629 * @sb: superblock of filesystem
630 *
631 */
632
633 void
634 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
635 {
636 umode_t mode;
637 struct v9fs_inode *v9inode = V9FS_I(inode);
638
639 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
640 inode->i_atime.tv_sec = stat->st_atime_sec;
641 inode->i_atime.tv_nsec = stat->st_atime_nsec;
642 inode->i_mtime.tv_sec = stat->st_mtime_sec;
643 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
644 inode->i_ctime.tv_sec = stat->st_ctime_sec;
645 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
646 inode->i_uid = stat->st_uid;
647 inode->i_gid = stat->st_gid;
648 set_nlink(inode, stat->st_nlink);
649
650 mode = stat->st_mode & S_IALLUGO;
651 mode |= inode->i_mode & ~S_IALLUGO;
652 inode->i_mode = mode;
653
654 i_size_write(inode, stat->st_size);
655 inode->i_blocks = stat->st_blocks;
656 } else {
657 if (stat->st_result_mask & P9_STATS_ATIME) {
658 inode->i_atime.tv_sec = stat->st_atime_sec;
659 inode->i_atime.tv_nsec = stat->st_atime_nsec;
660 }
661 if (stat->st_result_mask & P9_STATS_MTIME) {
662 inode->i_mtime.tv_sec = stat->st_mtime_sec;
663 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
664 }
665 if (stat->st_result_mask & P9_STATS_CTIME) {
666 inode->i_ctime.tv_sec = stat->st_ctime_sec;
667 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
668 }
669 if (stat->st_result_mask & P9_STATS_UID)
670 inode->i_uid = stat->st_uid;
671 if (stat->st_result_mask & P9_STATS_GID)
672 inode->i_gid = stat->st_gid;
673 if (stat->st_result_mask & P9_STATS_NLINK)
674 set_nlink(inode, stat->st_nlink);
675 if (stat->st_result_mask & P9_STATS_MODE) {
676 inode->i_mode = stat->st_mode;
677 if ((S_ISBLK(inode->i_mode)) ||
678 (S_ISCHR(inode->i_mode)))
679 init_special_inode(inode, inode->i_mode,
680 inode->i_rdev);
681 }
682 if (stat->st_result_mask & P9_STATS_RDEV)
683 inode->i_rdev = new_decode_dev(stat->st_rdev);
684 if (stat->st_result_mask & P9_STATS_SIZE)
685 i_size_write(inode, stat->st_size);
686 if (stat->st_result_mask & P9_STATS_BLOCKS)
687 inode->i_blocks = stat->st_blocks;
688 }
689 if (stat->st_result_mask & P9_STATS_GEN)
690 inode->i_generation = stat->st_gen;
691
692 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
693 * because the inode structure does not have fields for them.
694 */
695 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
696 }
697
698 static int
699 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
700 const char *symname)
701 {
702 int err;
703 gid_t gid;
704 char *name;
705 struct p9_qid qid;
706 struct inode *inode;
707 struct p9_fid *dfid;
708 struct p9_fid *fid = NULL;
709 struct v9fs_session_info *v9ses;
710
711 name = (char *) dentry->d_name.name;
712 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
713 v9ses = v9fs_inode2v9ses(dir);
714
715 dfid = v9fs_fid_lookup(dentry->d_parent);
716 if (IS_ERR(dfid)) {
717 err = PTR_ERR(dfid);
718 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
719 return err;
720 }
721
722 gid = v9fs_get_fsgid_for_create(dir);
723
724 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
725 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
726
727 if (err < 0) {
728 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
729 goto error;
730 }
731
732 v9fs_invalidate_inode_attr(dir);
733 if (v9ses->cache) {
734 /* Now walk from the parent so we can get an unopened fid. */
735 fid = p9_client_walk(dfid, 1, &name, 1);
736 if (IS_ERR(fid)) {
737 err = PTR_ERR(fid);
738 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
739 err);
740 fid = NULL;
741 goto error;
742 }
743
744 /* instantiate inode and assign the unopened fid to dentry */
745 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
746 if (IS_ERR(inode)) {
747 err = PTR_ERR(inode);
748 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
749 err);
750 goto error;
751 }
752 err = v9fs_fid_add(dentry, fid);
753 if (err < 0)
754 goto error;
755 d_instantiate(dentry, inode);
756 fid = NULL;
757 } else {
758 /* Not in cached mode. No need to populate inode with stat */
759 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
760 if (IS_ERR(inode)) {
761 err = PTR_ERR(inode);
762 goto error;
763 }
764 d_instantiate(dentry, inode);
765 }
766
767 error:
768 if (fid)
769 p9_client_clunk(fid);
770
771 return err;
772 }
773
774 /**
775 * v9fs_vfs_link_dotl - create a hardlink for dotl
776 * @old_dentry: dentry for file to link to
777 * @dir: inode destination for new link
778 * @dentry: dentry for link
779 *
780 */
781
782 static int
783 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
784 struct dentry *dentry)
785 {
786 int err;
787 char *name;
788 struct dentry *dir_dentry;
789 struct p9_fid *dfid, *oldfid;
790 struct v9fs_session_info *v9ses;
791
792 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
793 dir->i_ino, old_dentry->d_name.name, dentry->d_name.name);
794
795 v9ses = v9fs_inode2v9ses(dir);
796 dir_dentry = v9fs_dentry_from_dir_inode(dir);
797 dfid = v9fs_fid_lookup(dir_dentry);
798 if (IS_ERR(dfid))
799 return PTR_ERR(dfid);
800
801 oldfid = v9fs_fid_lookup(old_dentry);
802 if (IS_ERR(oldfid))
803 return PTR_ERR(oldfid);
804
805 name = (char *) dentry->d_name.name;
806
807 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
808
809 if (err < 0) {
810 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
811 return err;
812 }
813
814 v9fs_invalidate_inode_attr(dir);
815 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
816 /* Get the latest stat info from server. */
817 struct p9_fid *fid;
818 fid = v9fs_fid_lookup(old_dentry);
819 if (IS_ERR(fid))
820 return PTR_ERR(fid);
821
822 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
823 }
824 ihold(old_dentry->d_inode);
825 d_instantiate(dentry, old_dentry->d_inode);
826
827 return err;
828 }
829
830 /**
831 * v9fs_vfs_mknod_dotl - create a special file
832 * @dir: inode destination for new link
833 * @dentry: dentry for file
834 * @mode: mode for creation
835 * @rdev: device associated with special file
836 *
837 */
838 static int
839 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
840 dev_t rdev)
841 {
842 int err;
843 gid_t gid;
844 char *name;
845 umode_t mode;
846 struct v9fs_session_info *v9ses;
847 struct p9_fid *fid = NULL, *dfid = NULL;
848 struct inode *inode;
849 struct p9_qid qid;
850 struct dentry *dir_dentry;
851 struct posix_acl *dacl = NULL, *pacl = NULL;
852
853 p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n",
854 dir->i_ino, dentry->d_name.name, omode,
855 MAJOR(rdev), MINOR(rdev));
856
857 if (!new_valid_dev(rdev))
858 return -EINVAL;
859
860 v9ses = v9fs_inode2v9ses(dir);
861 dir_dentry = v9fs_dentry_from_dir_inode(dir);
862 dfid = v9fs_fid_lookup(dir_dentry);
863 if (IS_ERR(dfid)) {
864 err = PTR_ERR(dfid);
865 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
866 dfid = NULL;
867 goto error;
868 }
869
870 gid = v9fs_get_fsgid_for_create(dir);
871 mode = omode;
872 /* Update mode based on ACL value */
873 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
874 if (err) {
875 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
876 err);
877 goto error;
878 }
879 name = (char *) dentry->d_name.name;
880
881 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
882 if (err < 0)
883 goto error;
884
885 v9fs_invalidate_inode_attr(dir);
886 /* instantiate inode and assign the unopened fid to the dentry */
887 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
888 fid = p9_client_walk(dfid, 1, &name, 1);
889 if (IS_ERR(fid)) {
890 err = PTR_ERR(fid);
891 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
892 err);
893 fid = NULL;
894 goto error;
895 }
896
897 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
898 if (IS_ERR(inode)) {
899 err = PTR_ERR(inode);
900 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
901 err);
902 goto error;
903 }
904 err = v9fs_fid_add(dentry, fid);
905 if (err < 0)
906 goto error;
907 d_instantiate(dentry, inode);
908 fid = NULL;
909 } else {
910 /*
911 * Not in cached mode. No need to populate inode with stat.
912 * socket syscall returns a fd, so we need instantiate
913 */
914 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
915 if (IS_ERR(inode)) {
916 err = PTR_ERR(inode);
917 goto error;
918 }
919 d_instantiate(dentry, inode);
920 }
921 /* Now set the ACL based on the default value */
922 v9fs_set_create_acl(dentry, &dacl, &pacl);
923 error:
924 if (fid)
925 p9_client_clunk(fid);
926 v9fs_set_create_acl(NULL, &dacl, &pacl);
927 return err;
928 }
929
930 /**
931 * v9fs_vfs_follow_link_dotl - follow a symlink path
932 * @dentry: dentry for symlink
933 * @nd: nameidata
934 *
935 */
936
937 static void *
938 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
939 {
940 int retval;
941 struct p9_fid *fid;
942 char *link = __getname();
943 char *target;
944
945 p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
946
947 if (!link) {
948 link = ERR_PTR(-ENOMEM);
949 goto ndset;
950 }
951 fid = v9fs_fid_lookup(dentry);
952 if (IS_ERR(fid)) {
953 __putname(link);
954 link = ERR_CAST(fid);
955 goto ndset;
956 }
957 retval = p9_client_readlink(fid, &target);
958 if (!retval) {
959 strcpy(link, target);
960 kfree(target);
961 goto ndset;
962 }
963 __putname(link);
964 link = ERR_PTR(retval);
965 ndset:
966 nd_set_link(nd, link);
967 return NULL;
968 }
969
970 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
971 {
972 loff_t i_size;
973 struct p9_stat_dotl *st;
974 struct v9fs_session_info *v9ses;
975
976 v9ses = v9fs_inode2v9ses(inode);
977 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
978 if (IS_ERR(st))
979 return PTR_ERR(st);
980 /*
981 * Don't update inode if the file type is different
982 */
983 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
984 goto out;
985
986 spin_lock(&inode->i_lock);
987 /*
988 * We don't want to refresh inode->i_size,
989 * because we may have cached data
990 */
991 i_size = inode->i_size;
992 v9fs_stat2inode_dotl(st, inode);
993 if (v9ses->cache)
994 inode->i_size = i_size;
995 spin_unlock(&inode->i_lock);
996 out:
997 kfree(st);
998 return 0;
999 }
1000
1001 const struct inode_operations v9fs_dir_inode_operations_dotl = {
1002 .create = v9fs_vfs_create_dotl,
1003 .lookup = v9fs_vfs_lookup,
1004 .link = v9fs_vfs_link_dotl,
1005 .symlink = v9fs_vfs_symlink_dotl,
1006 .unlink = v9fs_vfs_unlink,
1007 .mkdir = v9fs_vfs_mkdir_dotl,
1008 .rmdir = v9fs_vfs_rmdir,
1009 .mknod = v9fs_vfs_mknod_dotl,
1010 .rename = v9fs_vfs_rename,
1011 .getattr = v9fs_vfs_getattr_dotl,
1012 .setattr = v9fs_vfs_setattr_dotl,
1013 .setxattr = generic_setxattr,
1014 .getxattr = generic_getxattr,
1015 .removexattr = generic_removexattr,
1016 .listxattr = v9fs_listxattr,
1017 .get_acl = v9fs_iop_get_acl,
1018 };
1019
1020 const struct inode_operations v9fs_file_inode_operations_dotl = {
1021 .getattr = v9fs_vfs_getattr_dotl,
1022 .setattr = v9fs_vfs_setattr_dotl,
1023 .setxattr = generic_setxattr,
1024 .getxattr = generic_getxattr,
1025 .removexattr = generic_removexattr,
1026 .listxattr = v9fs_listxattr,
1027 .get_acl = v9fs_iop_get_acl,
1028 };
1029
1030 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
1031 .readlink = generic_readlink,
1032 .follow_link = v9fs_vfs_follow_link_dotl,
1033 .put_link = v9fs_vfs_put_link,
1034 .getattr = v9fs_vfs_getattr_dotl,
1035 .setattr = v9fs_vfs_setattr_dotl,
1036 .setxattr = generic_setxattr,
1037 .getxattr = generic_getxattr,
1038 .removexattr = generic_removexattr,
1039 .listxattr = v9fs_listxattr,
1040 };