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Linux 3.16-rc2
[linux/fpc-iii.git] / fs / 9p / vfs_inode_dotl.c
blob1fa85aae24df0c0255934a2016feea8aba1d4fc1
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 unlock_new_inode(inode);
153 iput(inode);
154 return ERR_PTR(retval);
155
156 }
157
158 struct inode *
159 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
160 struct super_block *sb, int new)
161 {
162 struct p9_stat_dotl *st;
163 struct inode *inode = NULL;
164
165 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
166 if (IS_ERR(st))
167 return ERR_CAST(st);
168
169 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
170 kfree(st);
171 return inode;
172 }
173
174 struct dotl_openflag_map {
175 int open_flag;
176 int dotl_flag;
177 };
178
179 static int v9fs_mapped_dotl_flags(int flags)
180 {
181 int i;
182 int rflags = 0;
183 struct dotl_openflag_map dotl_oflag_map[] = {
184 { O_CREAT, P9_DOTL_CREATE },
185 { O_EXCL, P9_DOTL_EXCL },
186 { O_NOCTTY, P9_DOTL_NOCTTY },
187 { O_APPEND, P9_DOTL_APPEND },
188 { O_NONBLOCK, P9_DOTL_NONBLOCK },
189 { O_DSYNC, P9_DOTL_DSYNC },
190 { FASYNC, P9_DOTL_FASYNC },
191 { O_DIRECT, P9_DOTL_DIRECT },
192 { O_LARGEFILE, P9_DOTL_LARGEFILE },
193 { O_DIRECTORY, P9_DOTL_DIRECTORY },
194 { O_NOFOLLOW, P9_DOTL_NOFOLLOW },
195 { O_NOATIME, P9_DOTL_NOATIME },
196 { O_CLOEXEC, P9_DOTL_CLOEXEC },
197 { O_SYNC, P9_DOTL_SYNC},
198 };
199 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
200 if (flags & dotl_oflag_map[i].open_flag)
201 rflags |= dotl_oflag_map[i].dotl_flag;
202 }
203 return rflags;
204 }
205
206 /**
207 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
208 * plan 9 open flag.
209 * @flags: flags to convert
210 */
211 int v9fs_open_to_dotl_flags(int flags)
212 {
213 int rflags = 0;
214
215 /*
216 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
217 * and P9_DOTL_NOACCESS
218 */
219 rflags |= flags & O_ACCMODE;
220 rflags |= v9fs_mapped_dotl_flags(flags);
221
222 return rflags;
223 }
224
225 /**
226 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
227 * @dir: directory inode that is being created
228 * @dentry: dentry that is being deleted
229 * @omode: create permissions
230 *
231 */
232
233 static int
234 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
235 bool excl)
236 {
237 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
238 }
239
240 static int
241 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
242 struct file *file, unsigned flags, umode_t omode,
243 int *opened)
244 {
245 int err = 0;
246 kgid_t gid;
247 umode_t mode;
248 char *name = NULL;
249 struct p9_qid qid;
250 struct inode *inode;
251 struct p9_fid *fid = NULL;
252 struct v9fs_inode *v9inode;
253 struct p9_fid *dfid, *ofid, *inode_fid;
254 struct v9fs_session_info *v9ses;
255 struct posix_acl *pacl = NULL, *dacl = NULL;
256 struct dentry *res = NULL;
257
258 if (d_unhashed(dentry)) {
259 res = v9fs_vfs_lookup(dir, dentry, 0);
260 if (IS_ERR(res))
261 return PTR_ERR(res);
262
263 if (res)
264 dentry = res;
265 }
266
267 /* Only creates */
268 if (!(flags & O_CREAT) || dentry->d_inode)
269 return finish_no_open(file, res);
270
271 v9ses = v9fs_inode2v9ses(dir);
272
273 name = (char *) dentry->d_name.name;
274 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
275 name, flags, omode);
276
277 dfid = v9fs_fid_lookup(dentry->d_parent);
278 if (IS_ERR(dfid)) {
279 err = PTR_ERR(dfid);
280 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
281 goto out;
282 }
283
284 /* clone a fid to use for creation */
285 ofid = p9_client_walk(dfid, 0, NULL, 1);
286 if (IS_ERR(ofid)) {
287 err = PTR_ERR(ofid);
288 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
289 goto out;
290 }
291
292 gid = v9fs_get_fsgid_for_create(dir);
293
294 mode = omode;
295 /* Update mode based on ACL value */
296 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
297 if (err) {
298 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
299 err);
300 goto error;
301 }
302 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
303 mode, gid, &qid);
304 if (err < 0) {
305 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
306 err);
307 goto error;
308 }
309 v9fs_invalidate_inode_attr(dir);
310
311 /* instantiate inode and assign the unopened fid to the dentry */
312 fid = p9_client_walk(dfid, 1, &name, 1);
313 if (IS_ERR(fid)) {
314 err = PTR_ERR(fid);
315 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
316 fid = NULL;
317 goto error;
318 }
319 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
320 if (IS_ERR(inode)) {
321 err = PTR_ERR(inode);
322 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
323 goto error;
324 }
325 /* Now set the ACL based on the default value */
326 v9fs_set_create_acl(inode, fid, dacl, pacl);
327
328 v9fs_fid_add(dentry, fid);
329 d_instantiate(dentry, inode);
330
331 v9inode = V9FS_I(inode);
332 mutex_lock(&v9inode->v_mutex);
333 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
334 !v9inode->writeback_fid &&
335 ((flags & O_ACCMODE) != O_RDONLY)) {
336 /*
337 * clone a fid and add it to writeback_fid
338 * we do it during open time instead of
339 * page dirty time via write_begin/page_mkwrite
340 * because we want write after unlink usecase
341 * to work.
342 */
343 inode_fid = v9fs_writeback_fid(dentry);
344 if (IS_ERR(inode_fid)) {
345 err = PTR_ERR(inode_fid);
346 mutex_unlock(&v9inode->v_mutex);
347 goto err_clunk_old_fid;
348 }
349 v9inode->writeback_fid = (void *) inode_fid;
350 }
351 mutex_unlock(&v9inode->v_mutex);
352 /* Since we are opening a file, assign the open fid to the file */
353 err = finish_open(file, dentry, generic_file_open, opened);
354 if (err)
355 goto err_clunk_old_fid;
356 file->private_data = ofid;
357 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
358 v9fs_cache_inode_set_cookie(inode, file);
359 *opened |= FILE_CREATED;
360 out:
361 v9fs_put_acl(dacl, pacl);
362 dput(res);
363 return err;
364
365 error:
366 if (fid)
367 p9_client_clunk(fid);
368 err_clunk_old_fid:
369 if (ofid)
370 p9_client_clunk(ofid);
371 goto out;
372 }
373
374 /**
375 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
376 * @dir: inode that is being unlinked
377 * @dentry: dentry that is being unlinked
378 * @omode: mode for new directory
379 *
380 */
381
382 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
383 struct dentry *dentry, umode_t omode)
384 {
385 int err;
386 struct v9fs_session_info *v9ses;
387 struct p9_fid *fid = NULL, *dfid = NULL;
388 kgid_t gid;
389 char *name;
390 umode_t mode;
391 struct inode *inode;
392 struct p9_qid qid;
393 struct dentry *dir_dentry;
394 struct posix_acl *dacl = NULL, *pacl = NULL;
395
396 p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
397 err = 0;
398 v9ses = v9fs_inode2v9ses(dir);
399
400 omode |= S_IFDIR;
401 if (dir->i_mode & S_ISGID)
402 omode |= S_ISGID;
403
404 dir_dentry = dentry->d_parent;
405 dfid = v9fs_fid_lookup(dir_dentry);
406 if (IS_ERR(dfid)) {
407 err = PTR_ERR(dfid);
408 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
409 dfid = NULL;
410 goto error;
411 }
412
413 gid = v9fs_get_fsgid_for_create(dir);
414 mode = omode;
415 /* Update mode based on ACL value */
416 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
417 if (err) {
418 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
419 err);
420 goto error;
421 }
422 name = (char *) dentry->d_name.name;
423 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
424 if (err < 0)
425 goto error;
426
427 fid = p9_client_walk(dfid, 1, &name, 1);
428 if (IS_ERR(fid)) {
429 err = PTR_ERR(fid);
430 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
431 err);
432 fid = NULL;
433 goto error;
434 }
435
436 /* instantiate inode and assign the unopened fid to the dentry */
437 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
438 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
439 if (IS_ERR(inode)) {
440 err = PTR_ERR(inode);
441 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
442 err);
443 goto error;
444 }
445 v9fs_fid_add(dentry, fid);
446 v9fs_set_create_acl(inode, fid, dacl, pacl);
447 d_instantiate(dentry, inode);
448 fid = NULL;
449 err = 0;
450 } else {
451 /*
452 * Not in cached mode. No need to populate
453 * inode with stat. We need to get an inode
454 * so that we can set the acl with dentry
455 */
456 inode = v9fs_get_inode(dir->i_sb, mode, 0);
457 if (IS_ERR(inode)) {
458 err = PTR_ERR(inode);
459 goto error;
460 }
461 v9fs_set_create_acl(inode, fid, dacl, pacl);
462 d_instantiate(dentry, inode);
463 }
464 inc_nlink(dir);
465 v9fs_invalidate_inode_attr(dir);
466 error:
467 if (fid)
468 p9_client_clunk(fid);
469 v9fs_put_acl(dacl, pacl);
470 return err;
471 }
472
473 static int
474 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
475 struct kstat *stat)
476 {
477 struct v9fs_session_info *v9ses;
478 struct p9_fid *fid;
479 struct p9_stat_dotl *st;
480
481 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
482 v9ses = v9fs_dentry2v9ses(dentry);
483 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
484 generic_fillattr(dentry->d_inode, stat);
485 return 0;
486 }
487 fid = v9fs_fid_lookup(dentry);
488 if (IS_ERR(fid))
489 return PTR_ERR(fid);
490
491 /* Ask for all the fields in stat structure. Server will return
492 * whatever it supports
493 */
494
495 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
496 if (IS_ERR(st))
497 return PTR_ERR(st);
498
499 v9fs_stat2inode_dotl(st, dentry->d_inode);
500 generic_fillattr(dentry->d_inode, stat);
501 /* Change block size to what the server returned */
502 stat->blksize = st->st_blksize;
503
504 kfree(st);
505 return 0;
506 }
507
508 /*
509 * Attribute flags.
510 */
511 #define P9_ATTR_MODE (1 << 0)
512 #define P9_ATTR_UID (1 << 1)
513 #define P9_ATTR_GID (1 << 2)
514 #define P9_ATTR_SIZE (1 << 3)
515 #define P9_ATTR_ATIME (1 << 4)
516 #define P9_ATTR_MTIME (1 << 5)
517 #define P9_ATTR_CTIME (1 << 6)
518 #define P9_ATTR_ATIME_SET (1 << 7)
519 #define P9_ATTR_MTIME_SET (1 << 8)
520
521 struct dotl_iattr_map {
522 int iattr_valid;
523 int p9_iattr_valid;
524 };
525
526 static int v9fs_mapped_iattr_valid(int iattr_valid)
527 {
528 int i;
529 int p9_iattr_valid = 0;
530 struct dotl_iattr_map dotl_iattr_map[] = {
531 { ATTR_MODE, P9_ATTR_MODE },
532 { ATTR_UID, P9_ATTR_UID },
533 { ATTR_GID, P9_ATTR_GID },
534 { ATTR_SIZE, P9_ATTR_SIZE },
535 { ATTR_ATIME, P9_ATTR_ATIME },
536 { ATTR_MTIME, P9_ATTR_MTIME },
537 { ATTR_CTIME, P9_ATTR_CTIME },
538 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET },
539 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET },
540 };
541 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
542 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
543 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
544 }
545 return p9_iattr_valid;
546 }
547
548 /**
549 * v9fs_vfs_setattr_dotl - set file metadata
550 * @dentry: file whose metadata to set
551 * @iattr: metadata assignment structure
552 *
553 */
554
555 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
556 {
557 int retval;
558 struct p9_fid *fid;
559 struct p9_iattr_dotl p9attr;
560 struct inode *inode = dentry->d_inode;
561
562 p9_debug(P9_DEBUG_VFS, "\n");
563
564 retval = inode_change_ok(inode, iattr);
565 if (retval)
566 return retval;
567
568 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
569 p9attr.mode = iattr->ia_mode;
570 p9attr.uid = iattr->ia_uid;
571 p9attr.gid = iattr->ia_gid;
572 p9attr.size = iattr->ia_size;
573 p9attr.atime_sec = iattr->ia_atime.tv_sec;
574 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
575 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
576 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
577
578 fid = v9fs_fid_lookup(dentry);
579 if (IS_ERR(fid))
580 return PTR_ERR(fid);
581
582 /* Write all dirty data */
583 if (S_ISREG(inode->i_mode))
584 filemap_write_and_wait(inode->i_mapping);
585
586 retval = p9_client_setattr(fid, &p9attr);
587 if (retval < 0)
588 return retval;
589
590 if ((iattr->ia_valid & ATTR_SIZE) &&
591 iattr->ia_size != i_size_read(inode))
592 truncate_setsize(inode, iattr->ia_size);
593
594 v9fs_invalidate_inode_attr(inode);
595 setattr_copy(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 return retval;
602 }
603 return 0;
604 }
605
606 /**
607 * v9fs_stat2inode_dotl - populate an inode structure with stat info
608 * @stat: stat structure
609 * @inode: inode to populate
610 *
611 */
612
613 void
614 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
615 {
616 umode_t mode;
617 struct v9fs_inode *v9inode = V9FS_I(inode);
618
619 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
620 inode->i_atime.tv_sec = stat->st_atime_sec;
621 inode->i_atime.tv_nsec = stat->st_atime_nsec;
622 inode->i_mtime.tv_sec = stat->st_mtime_sec;
623 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
624 inode->i_ctime.tv_sec = stat->st_ctime_sec;
625 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
626 inode->i_uid = stat->st_uid;
627 inode->i_gid = stat->st_gid;
628 set_nlink(inode, stat->st_nlink);
629
630 mode = stat->st_mode & S_IALLUGO;
631 mode |= inode->i_mode & ~S_IALLUGO;
632 inode->i_mode = mode;
633
634 i_size_write(inode, stat->st_size);
635 inode->i_blocks = stat->st_blocks;
636 } else {
637 if (stat->st_result_mask & P9_STATS_ATIME) {
638 inode->i_atime.tv_sec = stat->st_atime_sec;
639 inode->i_atime.tv_nsec = stat->st_atime_nsec;
640 }
641 if (stat->st_result_mask & P9_STATS_MTIME) {
642 inode->i_mtime.tv_sec = stat->st_mtime_sec;
643 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
644 }
645 if (stat->st_result_mask & P9_STATS_CTIME) {
646 inode->i_ctime.tv_sec = stat->st_ctime_sec;
647 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
648 }
649 if (stat->st_result_mask & P9_STATS_UID)
650 inode->i_uid = stat->st_uid;
651 if (stat->st_result_mask & P9_STATS_GID)
652 inode->i_gid = stat->st_gid;
653 if (stat->st_result_mask & P9_STATS_NLINK)
654 set_nlink(inode, stat->st_nlink);
655 if (stat->st_result_mask & P9_STATS_MODE) {
656 inode->i_mode = stat->st_mode;
657 if ((S_ISBLK(inode->i_mode)) ||
658 (S_ISCHR(inode->i_mode)))
659 init_special_inode(inode, inode->i_mode,
660 inode->i_rdev);
661 }
662 if (stat->st_result_mask & P9_STATS_RDEV)
663 inode->i_rdev = new_decode_dev(stat->st_rdev);
664 if (stat->st_result_mask & P9_STATS_SIZE)
665 i_size_write(inode, stat->st_size);
666 if (stat->st_result_mask & P9_STATS_BLOCKS)
667 inode->i_blocks = stat->st_blocks;
668 }
669 if (stat->st_result_mask & P9_STATS_GEN)
670 inode->i_generation = stat->st_gen;
671
672 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
673 * because the inode structure does not have fields for them.
674 */
675 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
676 }
677
678 static int
679 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
680 const char *symname)
681 {
682 int err;
683 kgid_t gid;
684 char *name;
685 struct p9_qid qid;
686 struct inode *inode;
687 struct p9_fid *dfid;
688 struct p9_fid *fid = NULL;
689 struct v9fs_session_info *v9ses;
690
691 name = (char *) dentry->d_name.name;
692 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
693 v9ses = v9fs_inode2v9ses(dir);
694
695 dfid = v9fs_fid_lookup(dentry->d_parent);
696 if (IS_ERR(dfid)) {
697 err = PTR_ERR(dfid);
698 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
699 return err;
700 }
701
702 gid = v9fs_get_fsgid_for_create(dir);
703
704 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
705 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
706
707 if (err < 0) {
708 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
709 goto error;
710 }
711
712 v9fs_invalidate_inode_attr(dir);
713 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
714 /* Now walk from the parent so we can get an unopened fid. */
715 fid = p9_client_walk(dfid, 1, &name, 1);
716 if (IS_ERR(fid)) {
717 err = PTR_ERR(fid);
718 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
719 err);
720 fid = NULL;
721 goto error;
722 }
723
724 /* instantiate inode and assign the unopened fid to dentry */
725 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
726 if (IS_ERR(inode)) {
727 err = PTR_ERR(inode);
728 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
729 err);
730 goto error;
731 }
732 v9fs_fid_add(dentry, fid);
733 d_instantiate(dentry, inode);
734 fid = NULL;
735 err = 0;
736 } else {
737 /* Not in cached mode. No need to populate inode with stat */
738 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
739 if (IS_ERR(inode)) {
740 err = PTR_ERR(inode);
741 goto error;
742 }
743 d_instantiate(dentry, inode);
744 }
745
746 error:
747 if (fid)
748 p9_client_clunk(fid);
749
750 return err;
751 }
752
753 /**
754 * v9fs_vfs_link_dotl - create a hardlink for dotl
755 * @old_dentry: dentry for file to link to
756 * @dir: inode destination for new link
757 * @dentry: dentry for link
758 *
759 */
760
761 static int
762 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
763 struct dentry *dentry)
764 {
765 int err;
766 struct dentry *dir_dentry;
767 struct p9_fid *dfid, *oldfid;
768 struct v9fs_session_info *v9ses;
769
770 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
771 dir->i_ino, old_dentry->d_name.name, dentry->d_name.name);
772
773 v9ses = v9fs_inode2v9ses(dir);
774 dir_dentry = dentry->d_parent;
775 dfid = v9fs_fid_lookup(dir_dentry);
776 if (IS_ERR(dfid))
777 return PTR_ERR(dfid);
778
779 oldfid = v9fs_fid_lookup(old_dentry);
780 if (IS_ERR(oldfid))
781 return PTR_ERR(oldfid);
782
783 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
784
785 if (err < 0) {
786 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
787 return err;
788 }
789
790 v9fs_invalidate_inode_attr(dir);
791 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
792 /* Get the latest stat info from server. */
793 struct p9_fid *fid;
794 fid = v9fs_fid_lookup(old_dentry);
795 if (IS_ERR(fid))
796 return PTR_ERR(fid);
797
798 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
799 }
800 ihold(old_dentry->d_inode);
801 d_instantiate(dentry, old_dentry->d_inode);
802
803 return err;
804 }
805
806 /**
807 * v9fs_vfs_mknod_dotl - create a special file
808 * @dir: inode destination for new link
809 * @dentry: dentry for file
810 * @omode: mode for creation
811 * @rdev: device associated with special file
812 *
813 */
814 static int
815 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
816 dev_t rdev)
817 {
818 int err;
819 kgid_t gid;
820 char *name;
821 umode_t mode;
822 struct v9fs_session_info *v9ses;
823 struct p9_fid *fid = NULL, *dfid = NULL;
824 struct inode *inode;
825 struct p9_qid qid;
826 struct dentry *dir_dentry;
827 struct posix_acl *dacl = NULL, *pacl = NULL;
828
829 p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n",
830 dir->i_ino, dentry->d_name.name, omode,
831 MAJOR(rdev), MINOR(rdev));
832
833 if (!new_valid_dev(rdev))
834 return -EINVAL;
835
836 v9ses = v9fs_inode2v9ses(dir);
837 dir_dentry = dentry->d_parent;
838 dfid = v9fs_fid_lookup(dir_dentry);
839 if (IS_ERR(dfid)) {
840 err = PTR_ERR(dfid);
841 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
842 dfid = NULL;
843 goto error;
844 }
845
846 gid = v9fs_get_fsgid_for_create(dir);
847 mode = omode;
848 /* Update mode based on ACL value */
849 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
850 if (err) {
851 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
852 err);
853 goto error;
854 }
855 name = (char *) dentry->d_name.name;
856
857 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
858 if (err < 0)
859 goto error;
860
861 v9fs_invalidate_inode_attr(dir);
862 fid = p9_client_walk(dfid, 1, &name, 1);
863 if (IS_ERR(fid)) {
864 err = PTR_ERR(fid);
865 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
866 err);
867 fid = NULL;
868 goto error;
869 }
870
871 /* instantiate inode and assign the unopened fid to the dentry */
872 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
873 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
874 if (IS_ERR(inode)) {
875 err = PTR_ERR(inode);
876 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
877 err);
878 goto error;
879 }
880 v9fs_set_create_acl(inode, fid, dacl, pacl);
881 v9fs_fid_add(dentry, fid);
882 d_instantiate(dentry, inode);
883 fid = NULL;
884 err = 0;
885 } else {
886 /*
887 * Not in cached mode. No need to populate inode with stat.
888 * socket syscall returns a fd, so we need instantiate
889 */
890 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
891 if (IS_ERR(inode)) {
892 err = PTR_ERR(inode);
893 goto error;
894 }
895 v9fs_set_create_acl(inode, fid, dacl, pacl);
896 d_instantiate(dentry, inode);
897 }
898 error:
899 if (fid)
900 p9_client_clunk(fid);
901 v9fs_put_acl(dacl, pacl);
902 return err;
903 }
904
905 /**
906 * v9fs_vfs_follow_link_dotl - follow a symlink path
907 * @dentry: dentry for symlink
908 * @nd: nameidata
909 *
910 */
911
912 static void *
913 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
914 {
915 int retval;
916 struct p9_fid *fid;
917 char *link = __getname();
918 char *target;
919
920 p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
921
922 if (!link) {
923 link = ERR_PTR(-ENOMEM);
924 goto ndset;
925 }
926 fid = v9fs_fid_lookup(dentry);
927 if (IS_ERR(fid)) {
928 __putname(link);
929 link = ERR_CAST(fid);
930 goto ndset;
931 }
932 retval = p9_client_readlink(fid, &target);
933 if (!retval) {
934 strcpy(link, target);
935 kfree(target);
936 goto ndset;
937 }
938 __putname(link);
939 link = ERR_PTR(retval);
940 ndset:
941 nd_set_link(nd, link);
942 return NULL;
943 }
944
945 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
946 {
947 loff_t i_size;
948 struct p9_stat_dotl *st;
949 struct v9fs_session_info *v9ses;
950
951 v9ses = v9fs_inode2v9ses(inode);
952 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
953 if (IS_ERR(st))
954 return PTR_ERR(st);
955 /*
956 * Don't update inode if the file type is different
957 */
958 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
959 goto out;
960
961 spin_lock(&inode->i_lock);
962 /*
963 * We don't want to refresh inode->i_size,
964 * because we may have cached data
965 */
966 i_size = inode->i_size;
967 v9fs_stat2inode_dotl(st, inode);
968 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
969 inode->i_size = i_size;
970 spin_unlock(&inode->i_lock);
971 out:
972 kfree(st);
973 return 0;
974 }
975
976 const struct inode_operations v9fs_dir_inode_operations_dotl = {
977 .create = v9fs_vfs_create_dotl,
978 .atomic_open = v9fs_vfs_atomic_open_dotl,
979 .lookup = v9fs_vfs_lookup,
980 .link = v9fs_vfs_link_dotl,
981 .symlink = v9fs_vfs_symlink_dotl,
982 .unlink = v9fs_vfs_unlink,
983 .mkdir = v9fs_vfs_mkdir_dotl,
984 .rmdir = v9fs_vfs_rmdir,
985 .mknod = v9fs_vfs_mknod_dotl,
986 .rename = v9fs_vfs_rename,
987 .getattr = v9fs_vfs_getattr_dotl,
988 .setattr = v9fs_vfs_setattr_dotl,
989 .setxattr = generic_setxattr,
990 .getxattr = generic_getxattr,
991 .removexattr = generic_removexattr,
992 .listxattr = v9fs_listxattr,
993 .get_acl = v9fs_iop_get_acl,
994 };
995
996 const struct inode_operations v9fs_file_inode_operations_dotl = {
997 .getattr = v9fs_vfs_getattr_dotl,
998 .setattr = v9fs_vfs_setattr_dotl,
999 .setxattr = generic_setxattr,
1000 .getxattr = generic_getxattr,
1001 .removexattr = generic_removexattr,
1002 .listxattr = v9fs_listxattr,
1003 .get_acl = v9fs_iop_get_acl,
1004 };
1005
1006 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
1007 .readlink = generic_readlink,
1008 .follow_link = v9fs_vfs_follow_link_dotl,
1009 .put_link = v9fs_vfs_put_link,
1010 .getattr = v9fs_vfs_getattr_dotl,
1011 .setattr = v9fs_vfs_setattr_dotl,
1012 .setxattr = generic_setxattr,
1013 .getxattr = generic_getxattr,
1014 .removexattr = generic_removexattr,
1015 .listxattr = v9fs_listxattr,
1016 };
Linux with added FPC-III support