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Linux 4.2.6
[linux/fpc-iii.git] / fs / 9p / vfs_inode_dotl.c
blobe8aa57dc8d6dff5a7a46899d2ba94a4ec0b715b1
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 return 1;
91 }
92
93 /* Always get a new inode */
94 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
95 {
96 return 0;
97 }
98
99 static int v9fs_set_inode_dotl(struct inode *inode, void *data)
100 {
101 struct v9fs_inode *v9inode = V9FS_I(inode);
102 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
103
104 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
105 inode->i_generation = st->st_gen;
106 return 0;
107 }
108
109 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
110 struct p9_qid *qid,
111 struct p9_fid *fid,
112 struct p9_stat_dotl *st,
113 int new)
114 {
115 int retval;
116 unsigned long i_ino;
117 struct inode *inode;
118 struct v9fs_session_info *v9ses = sb->s_fs_info;
119 int (*test)(struct inode *, void *);
120
121 if (new)
122 test = v9fs_test_new_inode_dotl;
123 else
124 test = v9fs_test_inode_dotl;
125
126 i_ino = v9fs_qid2ino(qid);
127 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
128 if (!inode)
129 return ERR_PTR(-ENOMEM);
130 if (!(inode->i_state & I_NEW))
131 return inode;
132 /*
133 * initialize the inode with the stat info
134 * FIXME!! we may need support for stale inodes
135 * later.
136 */
137 inode->i_ino = i_ino;
138 retval = v9fs_init_inode(v9ses, inode,
139 st->st_mode, new_decode_dev(st->st_rdev));
140 if (retval)
141 goto error;
142
143 v9fs_stat2inode_dotl(st, inode);
144 v9fs_cache_inode_get_cookie(inode);
145 retval = v9fs_get_acl(inode, fid);
146 if (retval)
147 goto error;
148
149 unlock_new_inode(inode);
150 return inode;
151 error:
152 iget_failed(inode);
153 return ERR_PTR(retval);
154
155 }
156
157 struct inode *
158 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
159 struct super_block *sb, int new)
160 {
161 struct p9_stat_dotl *st;
162 struct inode *inode = NULL;
163
164 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
165 if (IS_ERR(st))
166 return ERR_CAST(st);
167
168 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
169 kfree(st);
170 return inode;
171 }
172
173 struct dotl_openflag_map {
174 int open_flag;
175 int dotl_flag;
176 };
177
178 static int v9fs_mapped_dotl_flags(int flags)
179 {
180 int i;
181 int rflags = 0;
182 struct dotl_openflag_map dotl_oflag_map[] = {
183 { O_CREAT, P9_DOTL_CREATE },
184 { O_EXCL, P9_DOTL_EXCL },
185 { O_NOCTTY, P9_DOTL_NOCTTY },
186 { O_APPEND, P9_DOTL_APPEND },
187 { O_NONBLOCK, P9_DOTL_NONBLOCK },
188 { O_DSYNC, P9_DOTL_DSYNC },
189 { FASYNC, P9_DOTL_FASYNC },
190 { O_DIRECT, P9_DOTL_DIRECT },
191 { O_LARGEFILE, P9_DOTL_LARGEFILE },
192 { O_DIRECTORY, P9_DOTL_DIRECTORY },
193 { O_NOFOLLOW, P9_DOTL_NOFOLLOW },
194 { O_NOATIME, P9_DOTL_NOATIME },
195 { O_CLOEXEC, P9_DOTL_CLOEXEC },
196 { O_SYNC, P9_DOTL_SYNC},
197 };
198 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
199 if (flags & dotl_oflag_map[i].open_flag)
200 rflags |= dotl_oflag_map[i].dotl_flag;
201 }
202 return rflags;
203 }
204
205 /**
206 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
207 * plan 9 open flag.
208 * @flags: flags to convert
209 */
210 int v9fs_open_to_dotl_flags(int flags)
211 {
212 int rflags = 0;
213
214 /*
215 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
216 * and P9_DOTL_NOACCESS
217 */
218 rflags |= flags & O_ACCMODE;
219 rflags |= v9fs_mapped_dotl_flags(flags);
220
221 return rflags;
222 }
223
224 /**
225 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
226 * @dir: directory inode that is being created
227 * @dentry: dentry that is being deleted
228 * @omode: create permissions
229 *
230 */
231
232 static int
233 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
234 bool excl)
235 {
236 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
237 }
238
239 static int
240 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
241 struct file *file, unsigned flags, umode_t omode,
242 int *opened)
243 {
244 int err = 0;
245 kgid_t gid;
246 umode_t mode;
247 char *name = NULL;
248 struct p9_qid qid;
249 struct inode *inode;
250 struct p9_fid *fid = NULL;
251 struct v9fs_inode *v9inode;
252 struct p9_fid *dfid, *ofid, *inode_fid;
253 struct v9fs_session_info *v9ses;
254 struct posix_acl *pacl = NULL, *dacl = NULL;
255 struct dentry *res = NULL;
256
257 if (d_unhashed(dentry)) {
258 res = v9fs_vfs_lookup(dir, dentry, 0);
259 if (IS_ERR(res))
260 return PTR_ERR(res);
261
262 if (res)
263 dentry = res;
264 }
265
266 /* Only creates */
267 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
268 return finish_no_open(file, res);
269
270 v9ses = v9fs_inode2v9ses(dir);
271
272 name = (char *) dentry->d_name.name;
273 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
274 name, flags, omode);
275
276 dfid = v9fs_fid_lookup(dentry->d_parent);
277 if (IS_ERR(dfid)) {
278 err = PTR_ERR(dfid);
279 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
280 goto out;
281 }
282
283 /* clone a fid to use for creation */
284 ofid = p9_client_walk(dfid, 0, NULL, 1);
285 if (IS_ERR(ofid)) {
286 err = PTR_ERR(ofid);
287 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
288 goto out;
289 }
290
291 gid = v9fs_get_fsgid_for_create(dir);
292
293 mode = omode;
294 /* Update mode based on ACL value */
295 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
296 if (err) {
297 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
298 err);
299 goto error;
300 }
301 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
302 mode, gid, &qid);
303 if (err < 0) {
304 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
305 err);
306 goto error;
307 }
308 v9fs_invalidate_inode_attr(dir);
309
310 /* instantiate inode and assign the unopened fid to the dentry */
311 fid = p9_client_walk(dfid, 1, &name, 1);
312 if (IS_ERR(fid)) {
313 err = PTR_ERR(fid);
314 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
315 fid = NULL;
316 goto error;
317 }
318 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
319 if (IS_ERR(inode)) {
320 err = PTR_ERR(inode);
321 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
322 goto error;
323 }
324 /* Now set the ACL based on the default value */
325 v9fs_set_create_acl(inode, fid, dacl, pacl);
326
327 v9fs_fid_add(dentry, fid);
328 d_instantiate(dentry, inode);
329
330 v9inode = V9FS_I(inode);
331 mutex_lock(&v9inode->v_mutex);
332 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
333 !v9inode->writeback_fid &&
334 ((flags & O_ACCMODE) != O_RDONLY)) {
335 /*
336 * clone a fid and add it to writeback_fid
337 * we do it during open time instead of
338 * page dirty time via write_begin/page_mkwrite
339 * because we want write after unlink usecase
340 * to work.
341 */
342 inode_fid = v9fs_writeback_fid(dentry);
343 if (IS_ERR(inode_fid)) {
344 err = PTR_ERR(inode_fid);
345 mutex_unlock(&v9inode->v_mutex);
346 goto err_clunk_old_fid;
347 }
348 v9inode->writeback_fid = (void *) inode_fid;
349 }
350 mutex_unlock(&v9inode->v_mutex);
351 /* Since we are opening a file, assign the open fid to the file */
352 err = finish_open(file, dentry, generic_file_open, opened);
353 if (err)
354 goto err_clunk_old_fid;
355 file->private_data = ofid;
356 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
357 v9fs_cache_inode_set_cookie(inode, file);
358 *opened |= FILE_CREATED;
359 out:
360 v9fs_put_acl(dacl, pacl);
361 dput(res);
362 return err;
363
364 error:
365 if (fid)
366 p9_client_clunk(fid);
367 err_clunk_old_fid:
368 if (ofid)
369 p9_client_clunk(ofid);
370 goto out;
371 }
372
373 /**
374 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
375 * @dir: inode that is being unlinked
376 * @dentry: dentry that is being unlinked
377 * @omode: mode for new directory
378 *
379 */
380
381 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
382 struct dentry *dentry, umode_t omode)
383 {
384 int err;
385 struct v9fs_session_info *v9ses;
386 struct p9_fid *fid = NULL, *dfid = NULL;
387 kgid_t gid;
388 char *name;
389 umode_t mode;
390 struct inode *inode;
391 struct p9_qid qid;
392 struct dentry *dir_dentry;
393 struct posix_acl *dacl = NULL, *pacl = NULL;
394
395 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
396 err = 0;
397 v9ses = v9fs_inode2v9ses(dir);
398
399 omode |= S_IFDIR;
400 if (dir->i_mode & S_ISGID)
401 omode |= S_ISGID;
402
403 dir_dentry = dentry->d_parent;
404 dfid = v9fs_fid_lookup(dir_dentry);
405 if (IS_ERR(dfid)) {
406 err = PTR_ERR(dfid);
407 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
408 dfid = NULL;
409 goto error;
410 }
411
412 gid = v9fs_get_fsgid_for_create(dir);
413 mode = omode;
414 /* Update mode based on ACL value */
415 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
416 if (err) {
417 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
418 err);
419 goto error;
420 }
421 name = (char *) dentry->d_name.name;
422 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
423 if (err < 0)
424 goto error;
425
426 fid = p9_client_walk(dfid, 1, &name, 1);
427 if (IS_ERR(fid)) {
428 err = PTR_ERR(fid);
429 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
430 err);
431 fid = NULL;
432 goto error;
433 }
434
435 /* instantiate inode and assign the unopened fid to the dentry */
436 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
437 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
438 if (IS_ERR(inode)) {
439 err = PTR_ERR(inode);
440 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
441 err);
442 goto error;
443 }
444 v9fs_fid_add(dentry, fid);
445 v9fs_set_create_acl(inode, fid, dacl, pacl);
446 d_instantiate(dentry, inode);
447 fid = NULL;
448 err = 0;
449 } else {
450 /*
451 * Not in cached mode. No need to populate
452 * inode with stat. We need to get an inode
453 * so that we can set the acl with dentry
454 */
455 inode = v9fs_get_inode(dir->i_sb, mode, 0);
456 if (IS_ERR(inode)) {
457 err = PTR_ERR(inode);
458 goto error;
459 }
460 v9fs_set_create_acl(inode, fid, dacl, pacl);
461 d_instantiate(dentry, inode);
462 }
463 inc_nlink(dir);
464 v9fs_invalidate_inode_attr(dir);
465 error:
466 if (fid)
467 p9_client_clunk(fid);
468 v9fs_put_acl(dacl, pacl);
469 return err;
470 }
471
472 static int
473 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
474 struct kstat *stat)
475 {
476 struct v9fs_session_info *v9ses;
477 struct p9_fid *fid;
478 struct p9_stat_dotl *st;
479
480 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
481 v9ses = v9fs_dentry2v9ses(dentry);
482 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
483 generic_fillattr(d_inode(dentry), stat);
484 return 0;
485 }
486 fid = v9fs_fid_lookup(dentry);
487 if (IS_ERR(fid))
488 return PTR_ERR(fid);
489
490 /* Ask for all the fields in stat structure. Server will return
491 * whatever it supports
492 */
493
494 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
495 if (IS_ERR(st))
496 return PTR_ERR(st);
497
498 v9fs_stat2inode_dotl(st, d_inode(dentry));
499 generic_fillattr(d_inode(dentry), stat);
500 /* Change block size to what the server returned */
501 stat->blksize = st->st_blksize;
502
503 kfree(st);
504 return 0;
505 }
506
507 /*
508 * Attribute flags.
509 */
510 #define P9_ATTR_MODE (1 << 0)
511 #define P9_ATTR_UID (1 << 1)
512 #define P9_ATTR_GID (1 << 2)
513 #define P9_ATTR_SIZE (1 << 3)
514 #define P9_ATTR_ATIME (1 << 4)
515 #define P9_ATTR_MTIME (1 << 5)
516 #define P9_ATTR_CTIME (1 << 6)
517 #define P9_ATTR_ATIME_SET (1 << 7)
518 #define P9_ATTR_MTIME_SET (1 << 8)
519
520 struct dotl_iattr_map {
521 int iattr_valid;
522 int p9_iattr_valid;
523 };
524
525 static int v9fs_mapped_iattr_valid(int iattr_valid)
526 {
527 int i;
528 int p9_iattr_valid = 0;
529 struct dotl_iattr_map dotl_iattr_map[] = {
530 { ATTR_MODE, P9_ATTR_MODE },
531 { ATTR_UID, P9_ATTR_UID },
532 { ATTR_GID, P9_ATTR_GID },
533 { ATTR_SIZE, P9_ATTR_SIZE },
534 { ATTR_ATIME, P9_ATTR_ATIME },
535 { ATTR_MTIME, P9_ATTR_MTIME },
536 { ATTR_CTIME, P9_ATTR_CTIME },
537 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET },
538 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET },
539 };
540 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
541 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
542 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
543 }
544 return p9_iattr_valid;
545 }
546
547 /**
548 * v9fs_vfs_setattr_dotl - set file metadata
549 * @dentry: file whose metadata to set
550 * @iattr: metadata assignment structure
551 *
552 */
553
554 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
555 {
556 int retval;
557 struct p9_fid *fid;
558 struct p9_iattr_dotl p9attr;
559 struct inode *inode = d_inode(dentry);
560
561 p9_debug(P9_DEBUG_VFS, "\n");
562
563 retval = inode_change_ok(inode, iattr);
564 if (retval)
565 return retval;
566
567 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
568 p9attr.mode = iattr->ia_mode;
569 p9attr.uid = iattr->ia_uid;
570 p9attr.gid = iattr->ia_gid;
571 p9attr.size = iattr->ia_size;
572 p9attr.atime_sec = iattr->ia_atime.tv_sec;
573 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
574 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
575 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
576
577 fid = v9fs_fid_lookup(dentry);
578 if (IS_ERR(fid))
579 return PTR_ERR(fid);
580
581 /* Write all dirty data */
582 if (S_ISREG(inode->i_mode))
583 filemap_write_and_wait(inode->i_mapping);
584
585 retval = p9_client_setattr(fid, &p9attr);
586 if (retval < 0)
587 return retval;
588
589 if ((iattr->ia_valid & ATTR_SIZE) &&
590 iattr->ia_size != i_size_read(inode))
591 truncate_setsize(inode, iattr->ia_size);
592
593 v9fs_invalidate_inode_attr(inode);
594 setattr_copy(inode, iattr);
595 mark_inode_dirty(inode);
596 if (iattr->ia_valid & ATTR_MODE) {
597 /* We also want to update ACL when we update mode bits */
598 retval = v9fs_acl_chmod(inode, fid);
599 if (retval < 0)
600 return retval;
601 }
602 return 0;
603 }
604
605 /**
606 * v9fs_stat2inode_dotl - populate an inode structure with stat info
607 * @stat: stat structure
608 * @inode: inode to populate
609 *
610 */
611
612 void
613 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
614 {
615 umode_t mode;
616 struct v9fs_inode *v9inode = V9FS_I(inode);
617
618 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
619 inode->i_atime.tv_sec = stat->st_atime_sec;
620 inode->i_atime.tv_nsec = stat->st_atime_nsec;
621 inode->i_mtime.tv_sec = stat->st_mtime_sec;
622 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
623 inode->i_ctime.tv_sec = stat->st_ctime_sec;
624 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
625 inode->i_uid = stat->st_uid;
626 inode->i_gid = stat->st_gid;
627 set_nlink(inode, stat->st_nlink);
628
629 mode = stat->st_mode & S_IALLUGO;
630 mode |= inode->i_mode & ~S_IALLUGO;
631 inode->i_mode = mode;
632
633 i_size_write(inode, stat->st_size);
634 inode->i_blocks = stat->st_blocks;
635 } else {
636 if (stat->st_result_mask & P9_STATS_ATIME) {
637 inode->i_atime.tv_sec = stat->st_atime_sec;
638 inode->i_atime.tv_nsec = stat->st_atime_nsec;
639 }
640 if (stat->st_result_mask & P9_STATS_MTIME) {
641 inode->i_mtime.tv_sec = stat->st_mtime_sec;
642 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
643 }
644 if (stat->st_result_mask & P9_STATS_CTIME) {
645 inode->i_ctime.tv_sec = stat->st_ctime_sec;
646 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
647 }
648 if (stat->st_result_mask & P9_STATS_UID)
649 inode->i_uid = stat->st_uid;
650 if (stat->st_result_mask & P9_STATS_GID)
651 inode->i_gid = stat->st_gid;
652 if (stat->st_result_mask & P9_STATS_NLINK)
653 set_nlink(inode, stat->st_nlink);
654 if (stat->st_result_mask & P9_STATS_MODE) {
655 inode->i_mode = stat->st_mode;
656 if ((S_ISBLK(inode->i_mode)) ||
657 (S_ISCHR(inode->i_mode)))
658 init_special_inode(inode, inode->i_mode,
659 inode->i_rdev);
660 }
661 if (stat->st_result_mask & P9_STATS_RDEV)
662 inode->i_rdev = new_decode_dev(stat->st_rdev);
663 if (stat->st_result_mask & P9_STATS_SIZE)
664 i_size_write(inode, stat->st_size);
665 if (stat->st_result_mask & P9_STATS_BLOCKS)
666 inode->i_blocks = stat->st_blocks;
667 }
668 if (stat->st_result_mask & P9_STATS_GEN)
669 inode->i_generation = stat->st_gen;
670
671 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
672 * because the inode structure does not have fields for them.
673 */
674 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
675 }
676
677 static int
678 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
679 const char *symname)
680 {
681 int err;
682 kgid_t gid;
683 char *name;
684 struct p9_qid qid;
685 struct inode *inode;
686 struct p9_fid *dfid;
687 struct p9_fid *fid = NULL;
688 struct v9fs_session_info *v9ses;
689
690 name = (char *) dentry->d_name.name;
691 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
692 v9ses = v9fs_inode2v9ses(dir);
693
694 dfid = v9fs_fid_lookup(dentry->d_parent);
695 if (IS_ERR(dfid)) {
696 err = PTR_ERR(dfid);
697 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
698 return err;
699 }
700
701 gid = v9fs_get_fsgid_for_create(dir);
702
703 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
704 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
705
706 if (err < 0) {
707 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
708 goto error;
709 }
710
711 v9fs_invalidate_inode_attr(dir);
712 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
713 /* Now walk from the parent so we can get an unopened fid. */
714 fid = p9_client_walk(dfid, 1, &name, 1);
715 if (IS_ERR(fid)) {
716 err = PTR_ERR(fid);
717 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
718 err);
719 fid = NULL;
720 goto error;
721 }
722
723 /* instantiate inode and assign the unopened fid to dentry */
724 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
725 if (IS_ERR(inode)) {
726 err = PTR_ERR(inode);
727 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
728 err);
729 goto error;
730 }
731 v9fs_fid_add(dentry, fid);
732 d_instantiate(dentry, inode);
733 fid = NULL;
734 err = 0;
735 } else {
736 /* Not in cached mode. No need to populate inode with stat */
737 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
738 if (IS_ERR(inode)) {
739 err = PTR_ERR(inode);
740 goto error;
741 }
742 d_instantiate(dentry, inode);
743 }
744
745 error:
746 if (fid)
747 p9_client_clunk(fid);
748
749 return err;
750 }
751
752 /**
753 * v9fs_vfs_link_dotl - create a hardlink for dotl
754 * @old_dentry: dentry for file to link to
755 * @dir: inode destination for new link
756 * @dentry: dentry for link
757 *
758 */
759
760 static int
761 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
762 struct dentry *dentry)
763 {
764 int err;
765 struct dentry *dir_dentry;
766 struct p9_fid *dfid, *oldfid;
767 struct v9fs_session_info *v9ses;
768
769 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
770 dir->i_ino, old_dentry, dentry);
771
772 v9ses = v9fs_inode2v9ses(dir);
773 dir_dentry = dentry->d_parent;
774 dfid = v9fs_fid_lookup(dir_dentry);
775 if (IS_ERR(dfid))
776 return PTR_ERR(dfid);
777
778 oldfid = v9fs_fid_lookup(old_dentry);
779 if (IS_ERR(oldfid))
780 return PTR_ERR(oldfid);
781
782 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
783
784 if (err < 0) {
785 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
786 return err;
787 }
788
789 v9fs_invalidate_inode_attr(dir);
790 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
791 /* Get the latest stat info from server. */
792 struct p9_fid *fid;
793 fid = v9fs_fid_lookup(old_dentry);
794 if (IS_ERR(fid))
795 return PTR_ERR(fid);
796
797 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
798 }
799 ihold(d_inode(old_dentry));
800 d_instantiate(dentry, d_inode(old_dentry));
801
802 return err;
803 }
804
805 /**
806 * v9fs_vfs_mknod_dotl - create a special file
807 * @dir: inode destination for new link
808 * @dentry: dentry for file
809 * @omode: mode for creation
810 * @rdev: device associated with special file
811 *
812 */
813 static int
814 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
815 dev_t rdev)
816 {
817 int err;
818 kgid_t gid;
819 char *name;
820 umode_t mode;
821 struct v9fs_session_info *v9ses;
822 struct p9_fid *fid = NULL, *dfid = NULL;
823 struct inode *inode;
824 struct p9_qid qid;
825 struct dentry *dir_dentry;
826 struct posix_acl *dacl = NULL, *pacl = NULL;
827
828 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
829 dir->i_ino, dentry, omode,
830 MAJOR(rdev), MINOR(rdev));
831
832 if (!new_valid_dev(rdev))
833 return -EINVAL;
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