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ocfs2: fix locking for res->tracking and dlm->tracking_list
[linux/fpc-iii.git] / fs / 9p / vfs_inode_dotl.c
blob0b88744c644673f1753bb8f0436c3644e8f6a6d1
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 kgid_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 static int v9fs_test_inode_dotl(struct inode *inode, void *data)
72 {
73 struct v9fs_inode *v9inode = V9FS_I(inode);
74 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
75
76 /* don't match inode of different type */
77 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
78 return 0;
79
80 if (inode->i_generation != st->st_gen)
81 return 0;
82
83 /* compare qid details */
84 if (memcmp(&v9inode->qid.version,
85 &st->qid.version, sizeof(v9inode->qid.version)))
86 return 0;
87
88 if (v9inode->qid.type != st->qid.type)
89 return 0;
90
91 if (v9inode->qid.path != st->qid.path)
92 return 0;
93 return 1;
94 }
95
96 /* Always get a new inode */
97 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
98 {
99 return 0;
100 }
101
102 static int v9fs_set_inode_dotl(struct inode *inode, void *data)
103 {
104 struct v9fs_inode *v9inode = V9FS_I(inode);
105 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
106
107 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
108 inode->i_generation = st->st_gen;
109 return 0;
110 }
111
112 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
113 struct p9_qid *qid,
114 struct p9_fid *fid,
115 struct p9_stat_dotl *st,
116 int new)
117 {
118 int retval;
119 unsigned long i_ino;
120 struct inode *inode;
121 struct v9fs_session_info *v9ses = sb->s_fs_info;
122 int (*test)(struct inode *, void *);
123
124 if (new)
125 test = v9fs_test_new_inode_dotl;
126 else
127 test = v9fs_test_inode_dotl;
128
129 i_ino = v9fs_qid2ino(qid);
130 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
131 if (!inode)
132 return ERR_PTR(-ENOMEM);
133 if (!(inode->i_state & I_NEW))
134 return inode;
135 /*
136 * initialize the inode with the stat info
137 * FIXME!! we may need support for stale inodes
138 * later.
139 */
140 inode->i_ino = i_ino;
141 retval = v9fs_init_inode(v9ses, inode,
142 st->st_mode, new_decode_dev(st->st_rdev));
143 if (retval)
144 goto error;
145
146 v9fs_stat2inode_dotl(st, inode);
147 v9fs_cache_inode_get_cookie(inode);
148 retval = v9fs_get_acl(inode, fid);
149 if (retval)
150 goto error;
151
152 unlock_new_inode(inode);
153 return inode;
154 error:
155 iget_failed(inode);
156 return ERR_PTR(retval);
157
158 }
159
160 struct inode *
161 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
162 struct super_block *sb, int new)
163 {
164 struct p9_stat_dotl *st;
165 struct inode *inode = NULL;
166
167 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
168 if (IS_ERR(st))
169 return ERR_CAST(st);
170
171 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
172 kfree(st);
173 return inode;
174 }
175
176 struct dotl_openflag_map {
177 int open_flag;
178 int dotl_flag;
179 };
180
181 static int v9fs_mapped_dotl_flags(int flags)
182 {
183 int i;
184 int rflags = 0;
185 struct dotl_openflag_map dotl_oflag_map[] = {
186 { O_CREAT, P9_DOTL_CREATE },
187 { O_EXCL, P9_DOTL_EXCL },
188 { O_NOCTTY, P9_DOTL_NOCTTY },
189 { O_APPEND, P9_DOTL_APPEND },
190 { O_NONBLOCK, P9_DOTL_NONBLOCK },
191 { O_DSYNC, P9_DOTL_DSYNC },
192 { FASYNC, P9_DOTL_FASYNC },
193 { O_DIRECT, P9_DOTL_DIRECT },
194 { O_LARGEFILE, P9_DOTL_LARGEFILE },
195 { O_DIRECTORY, P9_DOTL_DIRECTORY },
196 { O_NOFOLLOW, P9_DOTL_NOFOLLOW },
197 { O_NOATIME, P9_DOTL_NOATIME },
198 { O_CLOEXEC, P9_DOTL_CLOEXEC },
199 { O_SYNC, P9_DOTL_SYNC},
200 };
201 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
202 if (flags & dotl_oflag_map[i].open_flag)
203 rflags |= dotl_oflag_map[i].dotl_flag;
204 }
205 return rflags;
206 }
207
208 /**
209 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
210 * plan 9 open flag.
211 * @flags: flags to convert
212 */
213 int v9fs_open_to_dotl_flags(int flags)
214 {
215 int rflags = 0;
216
217 /*
218 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
219 * and P9_DOTL_NOACCESS
220 */
221 rflags |= flags & O_ACCMODE;
222 rflags |= v9fs_mapped_dotl_flags(flags);
223
224 return rflags;
225 }
226
227 /**
228 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
229 * @dir: directory inode that is being created
230 * @dentry: dentry that is being deleted
231 * @omode: create permissions
232 *
233 */
234
235 static int
236 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
237 bool excl)
238 {
239 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
240 }
241
242 static int
243 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
244 struct file *file, unsigned flags, umode_t omode,
245 int *opened)
246 {
247 int err = 0;
248 kgid_t gid;
249 umode_t mode;
250 char *name = NULL;
251 struct p9_qid qid;
252 struct inode *inode;
253 struct p9_fid *fid = NULL;
254 struct v9fs_inode *v9inode;
255 struct p9_fid *dfid, *ofid, *inode_fid;
256 struct v9fs_session_info *v9ses;
257 struct posix_acl *pacl = NULL, *dacl = NULL;
258 struct dentry *res = NULL;
259
260 if (d_unhashed(dentry)) {
261 res = v9fs_vfs_lookup(dir, dentry, 0);
262 if (IS_ERR(res))
263 return PTR_ERR(res);
264
265 if (res)
266 dentry = res;
267 }
268
269 /* Only creates */
270 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
271 return finish_no_open(file, res);
272
273 v9ses = v9fs_inode2v9ses(dir);
274
275 name = (char *) dentry->d_name.name;
276 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
277 name, flags, omode);
278
279 dfid = v9fs_fid_lookup(dentry->d_parent);
280 if (IS_ERR(dfid)) {
281 err = PTR_ERR(dfid);
282 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
283 goto out;
284 }
285
286 /* clone a fid to use for creation */
287 ofid = p9_client_walk(dfid, 0, NULL, 1);
288 if (IS_ERR(ofid)) {
289 err = PTR_ERR(ofid);
290 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
291 goto out;
292 }
293
294 gid = v9fs_get_fsgid_for_create(dir);
295
296 mode = omode;
297 /* Update mode based on ACL value */
298 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
299 if (err) {
300 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
301 err);
302 goto error;
303 }
304 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
305 mode, gid, &qid);
306 if (err < 0) {
307 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
308 err);
309 goto error;
310 }
311 v9fs_invalidate_inode_attr(dir);
312
313 /* instantiate inode and assign the unopened fid to the dentry */
314 fid = p9_client_walk(dfid, 1, &name, 1);
315 if (IS_ERR(fid)) {
316 err = PTR_ERR(fid);
317 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
318 fid = NULL;
319 goto error;
320 }
321 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
322 if (IS_ERR(inode)) {
323 err = PTR_ERR(inode);
324 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
325 goto error;
326 }
327 /* Now set the ACL based on the default value */
328 v9fs_set_create_acl(inode, fid, dacl, pacl);
329
330 v9fs_fid_add(dentry, fid);
331 d_instantiate(dentry, inode);
332
333 v9inode = V9FS_I(inode);
334 mutex_lock(&v9inode->v_mutex);
335 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
336 !v9inode->writeback_fid &&
337 ((flags & O_ACCMODE) != O_RDONLY)) {
338 /*
339 * clone a fid and add it to writeback_fid
340 * we do it during open time instead of
341 * page dirty time via write_begin/page_mkwrite
342 * because we want write after unlink usecase
343 * to work.
344 */
345 inode_fid = v9fs_writeback_fid(dentry);
346 if (IS_ERR(inode_fid)) {
347 err = PTR_ERR(inode_fid);
348 mutex_unlock(&v9inode->v_mutex);
349 goto err_clunk_old_fid;
350 }
351 v9inode->writeback_fid = (void *) inode_fid;
352 }
353 mutex_unlock(&v9inode->v_mutex);
354 /* Since we are opening a file, assign the open fid to the file */
355 err = finish_open(file, dentry, generic_file_open, opened);
356 if (err)
357 goto err_clunk_old_fid;
358 file->private_data = ofid;
359 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
360 v9fs_cache_inode_set_cookie(inode, file);
361 *opened |= FILE_CREATED;
362 out:
363 v9fs_put_acl(dacl, pacl);
364 dput(res);
365 return err;
366
367 error:
368 if (fid)
369 p9_client_clunk(fid);
370 err_clunk_old_fid:
371 if (ofid)
372 p9_client_clunk(ofid);
373 goto out;
374 }
375
376 /**
377 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
378 * @dir: inode that is being unlinked
379 * @dentry: dentry that is being unlinked
380 * @omode: mode for new directory
381 *
382 */
383
384 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
385 struct dentry *dentry, umode_t omode)
386 {
387 int err;
388 struct v9fs_session_info *v9ses;
389 struct p9_fid *fid = NULL, *dfid = NULL;
390 kgid_t gid;
391 char *name;
392 umode_t mode;
393 struct inode *inode;
394 struct p9_qid qid;
395 struct dentry *dir_dentry;
396 struct posix_acl *dacl = NULL, *pacl = NULL;
397
398 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
399 err = 0;
400 v9ses = v9fs_inode2v9ses(dir);
401
402 omode |= S_IFDIR;
403 if (dir->i_mode & S_ISGID)
404 omode |= S_ISGID;
405
406 dir_dentry = dentry->d_parent;
407 dfid = v9fs_fid_lookup(dir_dentry);
408 if (IS_ERR(dfid)) {
409 err = PTR_ERR(dfid);
410 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
411 dfid = NULL;
412 goto error;
413 }
414
415 gid = v9fs_get_fsgid_for_create(dir);
416 mode = omode;
417 /* Update mode based on ACL value */
418 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
419 if (err) {
420 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
421 err);
422 goto error;
423 }
424 name = (char *) dentry->d_name.name;
425 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
426 if (err < 0)
427 goto error;
428
429 fid = p9_client_walk(dfid, 1, &name, 1);
430 if (IS_ERR(fid)) {
431 err = PTR_ERR(fid);
432 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
433 err);
434 fid = NULL;
435 goto error;
436 }
437
438 /* instantiate inode and assign the unopened fid to the dentry */
439 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
440 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
441 if (IS_ERR(inode)) {
442 err = PTR_ERR(inode);
443 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
444 err);
445 goto error;
446 }
447 v9fs_fid_add(dentry, fid);
448 v9fs_set_create_acl(inode, fid, dacl, pacl);
449 d_instantiate(dentry, inode);
450 fid = NULL;
451 err = 0;
452 } else {
453 /*
454 * Not in cached mode. No need to populate
455 * inode with stat. We need to get an inode
456 * so that we can set the acl with dentry
457 */
458 inode = v9fs_get_inode(dir->i_sb, mode, 0);
459 if (IS_ERR(inode)) {
460 err = PTR_ERR(inode);
461 goto error;
462 }
463 v9fs_set_create_acl(inode, fid, dacl, pacl);
464 d_instantiate(dentry, inode);
465 }
466 inc_nlink(dir);
467 v9fs_invalidate_inode_attr(dir);
468 error:
469 if (fid)
470 p9_client_clunk(fid);
471 v9fs_put_acl(dacl, pacl);
472 return err;
473 }
474
475 static int
476 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
477 struct kstat *stat)
478 {
479 struct v9fs_session_info *v9ses;
480 struct p9_fid *fid;
481 struct p9_stat_dotl *st;
482
483 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
484 v9ses = v9fs_dentry2v9ses(dentry);
485 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
486 generic_fillattr(d_inode(dentry), stat);
487 return 0;
488 }
489 fid = v9fs_fid_lookup(dentry);
490 if (IS_ERR(fid))
491 return PTR_ERR(fid);
492
493 /* Ask for all the fields in stat structure. Server will return
494 * whatever it supports
495 */
496
497 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
498 if (IS_ERR(st))
499 return PTR_ERR(st);
500
501 v9fs_stat2inode_dotl(st, d_inode(dentry));
502 generic_fillattr(d_inode(dentry), stat);
503 /* Change block size to what the server returned */
504 stat->blksize = st->st_blksize;
505
506 kfree(st);
507 return 0;
508 }
509
510 /*
511 * Attribute flags.
512 */
513 #define P9_ATTR_MODE (1 << 0)
514 #define P9_ATTR_UID (1 << 1)
515 #define P9_ATTR_GID (1 << 2)
516 #define P9_ATTR_SIZE (1 << 3)
517 #define P9_ATTR_ATIME (1 << 4)
518 #define P9_ATTR_MTIME (1 << 5)
519 #define P9_ATTR_CTIME (1 << 6)
520 #define P9_ATTR_ATIME_SET (1 << 7)
521 #define P9_ATTR_MTIME_SET (1 << 8)
522
523 struct dotl_iattr_map {
524 int iattr_valid;
525 int p9_iattr_valid;
526 };
527
528 static int v9fs_mapped_iattr_valid(int iattr_valid)
529 {
530 int i;
531 int p9_iattr_valid = 0;
532 struct dotl_iattr_map dotl_iattr_map[] = {
533 { ATTR_MODE, P9_ATTR_MODE },
534 { ATTR_UID, P9_ATTR_UID },
535 { ATTR_GID, P9_ATTR_GID },
536 { ATTR_SIZE, P9_ATTR_SIZE },
537 { ATTR_ATIME, P9_ATTR_ATIME },
538 { ATTR_MTIME, P9_ATTR_MTIME },
539 { ATTR_CTIME, P9_ATTR_CTIME },
540 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET },
541 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET },
542 };
543 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
544 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
545 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
546 }
547 return p9_iattr_valid;
548 }
549
550 /**
551 * v9fs_vfs_setattr_dotl - set file metadata
552 * @dentry: file whose metadata to set
553 * @iattr: metadata assignment structure
554 *
555 */
556
557 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
558 {
559 int retval;
560 struct p9_fid *fid;
561 struct p9_iattr_dotl p9attr;
562 struct inode *inode = d_inode(dentry);
563
564 p9_debug(P9_DEBUG_VFS, "\n");
565
566 retval = inode_change_ok(inode, iattr);
567 if (retval)
568 return retval;
569
570 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
571 p9attr.mode = iattr->ia_mode;
572 p9attr.uid = iattr->ia_uid;
573 p9attr.gid = iattr->ia_gid;
574 p9attr.size = iattr->ia_size;
575 p9attr.atime_sec = iattr->ia_atime.tv_sec;
576 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
577 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
578 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
579
580 fid = v9fs_fid_lookup(dentry);
581 if (IS_ERR(fid))
582 return PTR_ERR(fid);
583
584 /* Write all dirty data */
585 if (S_ISREG(inode->i_mode))
586 filemap_write_and_wait(inode->i_mapping);
587
588 retval = p9_client_setattr(fid, &p9attr);
589 if (retval < 0)
590 return retval;
591
592 if ((iattr->ia_valid & ATTR_SIZE) &&
593 iattr->ia_size != i_size_read(inode))
594 truncate_setsize(inode, iattr->ia_size);
595
596 v9fs_invalidate_inode_attr(inode);
597 setattr_copy(inode, iattr);
598 mark_inode_dirty(inode);
599 if (iattr->ia_valid & ATTR_MODE) {
600 /* We also want to update ACL when we update mode bits */
601 retval = v9fs_acl_chmod(inode, fid);
602 if (retval < 0)
603 return retval;
604 }
605 return 0;
606 }
607
608 /**
609 * v9fs_stat2inode_dotl - populate an inode structure with stat info
610 * @stat: stat structure
611 * @inode: inode to populate
612 *
613 */
614
615 void
616 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
617 {
618 umode_t mode;
619 struct v9fs_inode *v9inode = V9FS_I(inode);
620
621 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
622 inode->i_atime.tv_sec = stat->st_atime_sec;
623 inode->i_atime.tv_nsec = stat->st_atime_nsec;
624 inode->i_mtime.tv_sec = stat->st_mtime_sec;
625 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
626 inode->i_ctime.tv_sec = stat->st_ctime_sec;
627 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
628 inode->i_uid = stat->st_uid;
629 inode->i_gid = stat->st_gid;
630 set_nlink(inode, stat->st_nlink);
631
632 mode = stat->st_mode & S_IALLUGO;
633 mode |= inode->i_mode & ~S_IALLUGO;
634 inode->i_mode = mode;
635
636 i_size_write(inode, stat->st_size);
637 inode->i_blocks = stat->st_blocks;
638 } else {
639 if (stat->st_result_mask & P9_STATS_ATIME) {
640 inode->i_atime.tv_sec = stat->st_atime_sec;
641 inode->i_atime.tv_nsec = stat->st_atime_nsec;
642 }
643 if (stat->st_result_mask & P9_STATS_MTIME) {
644 inode->i_mtime.tv_sec = stat->st_mtime_sec;
645 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
646 }
647 if (stat->st_result_mask & P9_STATS_CTIME) {
648 inode->i_ctime.tv_sec = stat->st_ctime_sec;
649 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
650 }
651 if (stat->st_result_mask & P9_STATS_UID)
652 inode->i_uid = stat->st_uid;
653 if (stat->st_result_mask & P9_STATS_GID)
654 inode->i_gid = stat->st_gid;
655 if (stat->st_result_mask & P9_STATS_NLINK)
656 set_nlink(inode, stat->st_nlink);
657 if (stat->st_result_mask & P9_STATS_MODE) {
658 inode->i_mode = stat->st_mode;
659 if ((S_ISBLK(inode->i_mode)) ||
660 (S_ISCHR(inode->i_mode)))
661 init_special_inode(inode, inode->i_mode,
662 inode->i_rdev);
663 }
664 if (stat->st_result_mask & P9_STATS_RDEV)
665 inode->i_rdev = new_decode_dev(stat->st_rdev);
666 if (stat->st_result_mask & P9_STATS_SIZE)
667 i_size_write(inode, stat->st_size);
668 if (stat->st_result_mask & P9_STATS_BLOCKS)
669 inode->i_blocks = stat->st_blocks;
670 }
671 if (stat->st_result_mask & P9_STATS_GEN)
672 inode->i_generation = stat->st_gen;
673
674 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
675 * because the inode structure does not have fields for them.
676 */
677 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
678 }
679
680 static int
681 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
682 const char *symname)
683 {
684 int err;
685 kgid_t gid;
686 char *name;
687 struct p9_qid qid;
688 struct inode *inode;
689 struct p9_fid *dfid;
690 struct p9_fid *fid = NULL;
691 struct v9fs_session_info *v9ses;
692
693 name = (char *) dentry->d_name.name;
694 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
695 v9ses = v9fs_inode2v9ses(dir);
696
697 dfid = v9fs_fid_lookup(dentry->d_parent);
698 if (IS_ERR(dfid)) {
699 err = PTR_ERR(dfid);
700 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
701 return err;
702 }
703
704 gid = v9fs_get_fsgid_for_create(dir);
705
706 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
707 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
708
709 if (err < 0) {
710 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
711 goto error;
712 }
713
714 v9fs_invalidate_inode_attr(dir);
715 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
716 /* Now walk from the parent so we can get an unopened fid. */
717 fid = p9_client_walk(dfid, 1, &name, 1);
718 if (IS_ERR(fid)) {
719 err = PTR_ERR(fid);
720 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
721 err);
722 fid = NULL;
723 goto error;
724 }
725
726 /* instantiate inode and assign the unopened fid to dentry */
727 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
728 if (IS_ERR(inode)) {
729 err = PTR_ERR(inode);
730 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
731 err);
732 goto error;
733 }
734 v9fs_fid_add(dentry, fid);
735 d_instantiate(dentry, inode);
736 fid = NULL;
737 err = 0;
738 } else {
739 /* Not in cached mode. No need to populate inode with stat */
740 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
741 if (IS_ERR(inode)) {
742 err = PTR_ERR(inode);
743 goto error;
744 }
745 d_instantiate(dentry, inode);
746 }
747
748 error:
749 if (fid)
750 p9_client_clunk(fid);
751
752 return err;
753 }
754
755 /**
756 * v9fs_vfs_link_dotl - create a hardlink for dotl
757 * @old_dentry: dentry for file to link to
758 * @dir: inode destination for new link
759 * @dentry: dentry for link
760 *
761 */
762
763 static int
764 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
765 struct dentry *dentry)
766 {
767 int err;
768 struct dentry *dir_dentry;
769 struct p9_fid *dfid, *oldfid;
770 struct v9fs_session_info *v9ses;
771
772 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
773 dir->i_ino, old_dentry, dentry);
774
775 v9ses = v9fs_inode2v9ses(dir);
776 dir_dentry = dentry->d_parent;
777 dfid = v9fs_fid_lookup(dir_dentry);
778 if (IS_ERR(dfid))
779 return PTR_ERR(dfid);
780
781 oldfid = v9fs_fid_lookup(old_dentry);
782 if (IS_ERR(oldfid))
783 return PTR_ERR(oldfid);
784
785 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
786
787 if (err < 0) {
788 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
789 return err;
790 }
791
792 v9fs_invalidate_inode_attr(dir);
793 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
794 /* Get the latest stat info from server. */
795 struct p9_fid *fid;
796 fid = v9fs_fid_lookup(old_dentry);
797 if (IS_ERR(fid))
798 return PTR_ERR(fid);
799
800 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
801 }
802 ihold(d_inode(old_dentry));
803 d_instantiate(dentry, d_inode(old_dentry));
804
805 return err;
806 }
807
808 /**
809 * v9fs_vfs_mknod_dotl - create a special file
810 * @dir: inode destination for new link
811 * @dentry: dentry for file
812 * @omode: mode for creation
813 * @rdev: device associated with special file
814 *
815 */
816 static int
817 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
818 dev_t rdev)
819 {
820 int err;
821 kgid_t gid;
822 char *name;
823 umode_t mode;
824 struct v9fs_session_info *v9ses;
825 struct p9_fid *fid = NULL, *dfid = NULL;
826 struct inode *inode;
827 struct p9_qid qid;
828 struct dentry *dir_dentry;
829 struct posix_acl *dacl = NULL, *pacl = NULL;
830
831 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
832 dir->i_ino, dentry, omode,
833 MAJOR(rdev), MINOR(rdev));
834
835 v9ses = v9fs_inode2v9ses(dir);
836 dir_dentry = dentry->d_parent;
837 dfid = v9fs_fid_lookup(dir_dentry);
838 if (IS_ERR(dfid)) {
839 err = PTR_ERR(dfid);
840 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
841 dfid = NULL;
842 goto error;
843 }
844
845 gid = v9fs_get_fsgid_for_create(dir);
846 mode = omode;
847 /* Update mode based on ACL value */
848 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
849 if (err) {
850 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
851 err);
852 goto error;
853 }
854 name = (char *) dentry->d_name.name;
855
856 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
857 if (err < 0)
858 goto error;
859
860 v9fs_invalidate_inode_attr(dir);
861 fid = p9_client_walk(dfid, 1, &name, 1);
862 if (IS_ERR(fid)) {
863 err = PTR_ERR(fid);
864 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
865 err);
866 fid = NULL;
867 goto error;
868 }
869
870 /* instantiate inode and assign the unopened fid to the dentry */
871 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
872 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
873 if (IS_ERR(inode)) {
874 err = PTR_ERR(inode);
875 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
876 err);
877 goto error;
878 }
879 v9fs_set_create_acl(inode, fid, dacl, pacl);
880 v9fs_fid_add(dentry, fid);
881 d_instantiate(dentry, inode);
882 fid = NULL;
883 err = 0;
884 } else {
885 /*
886 * Not in cached mode. No need to populate inode with stat.
887 * socket syscall returns a fd, so we need instantiate
888 */
889 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
890 if (IS_ERR(inode)) {
891 err = PTR_ERR(inode);
892 goto error;
893 }
894 v9fs_set_create_acl(inode, fid, dacl, pacl);
895 d_instantiate(dentry, inode);
896 }
897 error:
898 if (fid)
899 p9_client_clunk(fid);
900 v9fs_put_acl(dacl, pacl);
901 return err;
902 }
903
904 /**
905 * v9fs_vfs_follow_link_dotl - follow a symlink path
906 * @dentry: dentry for symlink
907 * @cookie: place to pass the data to put_link()
908 */
909
910 static const char *
911 v9fs_vfs_follow_link_dotl(struct dentry *dentry, void **cookie)
912 {
913 struct p9_fid *fid = v9fs_fid_lookup(dentry);
914 char *target;
915 int retval;
916
917 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
918
919 if (IS_ERR(fid))
920 return ERR_CAST(fid);
921 retval = p9_client_readlink(fid, &target);
922 if (retval)
923 return ERR_PTR(retval);
924 return *cookie = target;
925 }
926
927 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
928 {
929 loff_t i_size;
930 struct p9_stat_dotl *st;
931 struct v9fs_session_info *v9ses;
932
933 v9ses = v9fs_inode2v9ses(inode);
934 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
935 if (IS_ERR(st))
936 return PTR_ERR(st);
937 /*
938 * Don't update inode if the file type is different
939 */
940 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
941 goto out;
942
943 spin_lock(&inode->i_lock);
944 /*
945 * We don't want to refresh inode->i_size,
946 * because we may have cached data
947 */
948 i_size = inode->i_size;
949 v9fs_stat2inode_dotl(st, inode);
950 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
951 inode->i_size = i_size;
952 spin_unlock(&inode->i_lock);
953 out:
954 kfree(st);
955 return 0;
956 }
957
958 const struct inode_operations v9fs_dir_inode_operations_dotl = {
959 .create = v9fs_vfs_create_dotl,
960 .atomic_open = v9fs_vfs_atomic_open_dotl,
961 .lookup = v9fs_vfs_lookup,
962 .link = v9fs_vfs_link_dotl,
963 .symlink = v9fs_vfs_symlink_dotl,
964 .unlink = v9fs_vfs_unlink,
965 .mkdir = v9fs_vfs_mkdir_dotl,
966 .rmdir = v9fs_vfs_rmdir,
967 .mknod = v9fs_vfs_mknod_dotl,
968 .rename = v9fs_vfs_rename,
969 .getattr = v9fs_vfs_getattr_dotl,
970 .setattr = v9fs_vfs_setattr_dotl,
971 .setxattr = generic_setxattr,
972 .getxattr = generic_getxattr,
973 .removexattr = generic_removexattr,
974 .listxattr = v9fs_listxattr,
975 .get_acl = v9fs_iop_get_acl,
976 };
977
978 const struct inode_operations v9fs_file_inode_operations_dotl = {
979 .getattr = v9fs_vfs_getattr_dotl,
980 .setattr = v9fs_vfs_setattr_dotl,
981 .setxattr = generic_setxattr,
982 .getxattr = generic_getxattr,
983 .removexattr = generic_removexattr,
984 .listxattr = v9fs_listxattr,
985 .get_acl = v9fs_iop_get_acl,
986 };
987
988 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
989 .readlink = generic_readlink,
990 .follow_link = v9fs_vfs_follow_link_dotl,
991 .put_link = kfree_put_link,
992 .getattr = v9fs_vfs_getattr_dotl,
993 .setattr = v9fs_vfs_setattr_dotl,
994 .setxattr = generic_setxattr,
995 .getxattr = generic_getxattr,
996 .removexattr = generic_removexattr,
997 .listxattr = v9fs_listxattr,
998 };
Linux with added FPC-III support