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Linux 3.12.28
[linux/fpc-iii.git] / fs / 9p / vfs_inode_dotl.c
bloba7c481402c4654416106d22d1ed7d85f65f6f8e1
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 #ifdef CONFIG_9P_FSCACHE
145 v9fs_cache_inode_get_cookie(inode);
146 #endif
147 retval = v9fs_get_acl(inode, fid);
148 if (retval)
149 goto error;
150
151 unlock_new_inode(inode);
152 return inode;
153 error:
154 unlock_new_inode(inode);
155 iput(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 * @mode: 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) || dentry->d_inode)
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 && !v9inode->writeback_fid &&
336 ((flags & O_ACCMODE) != O_RDONLY)) {
337 /*
338 * clone a fid and add it to writeback_fid
339 * we do it during open time instead of
340 * page dirty time via write_begin/page_mkwrite
341 * because we want write after unlink usecase
342 * to work.
343 */
344 inode_fid = v9fs_writeback_fid(dentry);
345 if (IS_ERR(inode_fid)) {
346 err = PTR_ERR(inode_fid);
347 mutex_unlock(&v9inode->v_mutex);
348 goto err_clunk_old_fid;
349 }
350 v9inode->writeback_fid = (void *) inode_fid;
351 }
352 mutex_unlock(&v9inode->v_mutex);
353 /* Since we are opening a file, assign the open fid to the file */
354 err = finish_open(file, dentry, generic_file_open, opened);
355 if (err)
356 goto err_clunk_old_fid;
357 file->private_data = ofid;
358 #ifdef CONFIG_9P_FSCACHE
359 if (v9ses->cache)
360 v9fs_cache_inode_set_cookie(inode, file);
361 #endif
362 *opened |= FILE_CREATED;
363 out:
364 v9fs_put_acl(dacl, pacl);
365 dput(res);
366 return err;
367
368 error:
369 if (fid)
370 p9_client_clunk(fid);
371 err_clunk_old_fid:
372 if (ofid)
373 p9_client_clunk(ofid);
374 goto out;
375 }
376
377 /**
378 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
379 * @dir: inode that is being unlinked
380 * @dentry: dentry that is being unlinked
381 * @mode: mode for new directory
382 *
383 */
384
385 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
386 struct dentry *dentry, umode_t omode)
387 {
388 int err;
389 struct v9fs_session_info *v9ses;
390 struct p9_fid *fid = NULL, *dfid = NULL;
391 kgid_t gid;
392 char *name;
393 umode_t mode;
394 struct inode *inode;
395 struct p9_qid qid;
396 struct dentry *dir_dentry;
397 struct posix_acl *dacl = NULL, *pacl = NULL;
398
399 p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
400 err = 0;
401 v9ses = v9fs_inode2v9ses(dir);
402
403 omode |= S_IFDIR;
404 if (dir->i_mode & S_ISGID)
405 omode |= S_ISGID;
406
407 dir_dentry = dentry->d_parent;
408 dfid = v9fs_fid_lookup(dir_dentry);
409 if (IS_ERR(dfid)) {
410 err = PTR_ERR(dfid);
411 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
412 dfid = NULL;
413 goto error;
414 }
415
416 gid = v9fs_get_fsgid_for_create(dir);
417 mode = omode;
418 /* Update mode based on ACL value */
419 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
420 if (err) {
421 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
422 err);
423 goto error;
424 }
425 name = (char *) dentry->d_name.name;
426 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
427 if (err < 0)
428 goto error;
429
430 fid = p9_client_walk(dfid, 1, &name, 1);
431 if (IS_ERR(fid)) {
432 err = PTR_ERR(fid);
433 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
434 err);
435 fid = NULL;
436 goto error;
437 }
438
439 /* instantiate inode and assign the unopened fid to the dentry */
440 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
441 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
442 if (IS_ERR(inode)) {
443 err = PTR_ERR(inode);
444 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
445 err);
446 goto error;
447 }
448 v9fs_fid_add(dentry, fid);
449 v9fs_set_create_acl(inode, fid, dacl, pacl);
450 d_instantiate(dentry, inode);
451 fid = NULL;
452 err = 0;
453 } else {
454 /*
455 * Not in cached mode. No need to populate
456 * inode with stat. We need to get an inode
457 * so that we can set the acl with dentry
458 */
459 inode = v9fs_get_inode(dir->i_sb, mode, 0);
460 if (IS_ERR(inode)) {
461 err = PTR_ERR(inode);
462 goto error;
463 }
464 v9fs_set_create_acl(inode, fid, dacl, pacl);
465 d_instantiate(dentry, inode);
466 }
467 inc_nlink(dir);
468 v9fs_invalidate_inode_attr(dir);
469 error:
470 if (fid)
471 p9_client_clunk(fid);
472 v9fs_put_acl(dacl, pacl);
473 return err;
474 }
475
476 static int
477 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
478 struct kstat *stat)
479 {
480 int err;
481 struct v9fs_session_info *v9ses;
482 struct p9_fid *fid;
483 struct p9_stat_dotl *st;
484
485 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
486 err = -EPERM;
487 v9ses = v9fs_dentry2v9ses(dentry);
488 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
489 generic_fillattr(dentry->d_inode, stat);
490 return 0;
491 }
492 fid = v9fs_fid_lookup(dentry);
493 if (IS_ERR(fid))
494 return PTR_ERR(fid);
495
496 /* Ask for all the fields in stat structure. Server will return
497 * whatever it supports
498 */
499
500 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
501 if (IS_ERR(st))
502 return PTR_ERR(st);
503
504 v9fs_stat2inode_dotl(st, dentry->d_inode);
505 generic_fillattr(dentry->d_inode, stat);
506 /* Change block size to what the server returned */
507 stat->blksize = st->st_blksize;
508
509 kfree(st);
510 return 0;
511 }
512
513 /*
514 * Attribute flags.
515 */
516 #define P9_ATTR_MODE (1 << 0)
517 #define P9_ATTR_UID (1 << 1)
518 #define P9_ATTR_GID (1 << 2)
519 #define P9_ATTR_SIZE (1 << 3)
520 #define P9_ATTR_ATIME (1 << 4)
521 #define P9_ATTR_MTIME (1 << 5)
522 #define P9_ATTR_CTIME (1 << 6)
523 #define P9_ATTR_ATIME_SET (1 << 7)
524 #define P9_ATTR_MTIME_SET (1 << 8)
525
526 struct dotl_iattr_map {
527 int iattr_valid;
528 int p9_iattr_valid;
529 };
530
531 static int v9fs_mapped_iattr_valid(int iattr_valid)
532 {
533 int i;
534 int p9_iattr_valid = 0;
535 struct dotl_iattr_map dotl_iattr_map[] = {
536 { ATTR_MODE, P9_ATTR_MODE },
537 { ATTR_UID, P9_ATTR_UID },
538 { ATTR_GID, P9_ATTR_GID },
539 { ATTR_SIZE, P9_ATTR_SIZE },
540 { ATTR_ATIME, P9_ATTR_ATIME },
541 { ATTR_MTIME, P9_ATTR_MTIME },
542 { ATTR_CTIME, P9_ATTR_CTIME },
543 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET },
544 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET },
545 };
546 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
547 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
548 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
549 }
550 return p9_iattr_valid;
551 }
552
553 /**
554 * v9fs_vfs_setattr_dotl - set file metadata
555 * @dentry: file whose metadata to set
556 * @iattr: metadata assignment structure
557 *
558 */
559
560 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
561 {
562 int retval;
563 struct v9fs_session_info *v9ses;
564 struct p9_fid *fid;
565 struct p9_iattr_dotl p9attr;
566 struct inode *inode = dentry->d_inode;
567
568 p9_debug(P9_DEBUG_VFS, "\n");
569
570 retval = inode_change_ok(inode, iattr);
571 if (retval)
572 return retval;
573
574 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
575 p9attr.mode = iattr->ia_mode;
576 p9attr.uid = iattr->ia_uid;
577 p9attr.gid = iattr->ia_gid;
578 p9attr.size = iattr->ia_size;
579 p9attr.atime_sec = iattr->ia_atime.tv_sec;
580 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
581 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
582 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
583
584 retval = -EPERM;
585 v9ses = v9fs_dentry2v9ses(dentry);
586 fid = v9fs_fid_lookup(dentry);
587 if (IS_ERR(fid))
588 return PTR_ERR(fid);
589
590 /* Write all dirty data */
591 if (S_ISREG(inode->i_mode))
592 filemap_write_and_wait(inode->i_mapping);
593
594 retval = p9_client_setattr(fid, &p9attr);
595 if (retval < 0)
596 return retval;
597
598 if ((iattr->ia_valid & ATTR_SIZE) &&
599 iattr->ia_size != i_size_read(inode))
600 truncate_setsize(inode, iattr->ia_size);
601
602 v9fs_invalidate_inode_attr(inode);
603 setattr_copy(inode, iattr);
604 mark_inode_dirty(inode);
605 if (iattr->ia_valid & ATTR_MODE) {
606 /* We also want to update ACL when we update mode bits */
607 retval = v9fs_acl_chmod(inode, fid);
608 if (retval < 0)
609 return retval;
610 }
611 return 0;
612 }
613
614 /**
615 * v9fs_stat2inode_dotl - populate an inode structure with stat info
616 * @stat: stat structure
617 * @inode: inode to populate
618 * @sb: superblock of filesystem
619 *
620 */
621
622 void
623 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
624 {
625 umode_t mode;
626 struct v9fs_inode *v9inode = V9FS_I(inode);
627
628 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
629 inode->i_atime.tv_sec = stat->st_atime_sec;
630 inode->i_atime.tv_nsec = stat->st_atime_nsec;
631 inode->i_mtime.tv_sec = stat->st_mtime_sec;
632 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
633 inode->i_ctime.tv_sec = stat->st_ctime_sec;
634 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
635 inode->i_uid = stat->st_uid;
636 inode->i_gid = stat->st_gid;
637 set_nlink(inode, stat->st_nlink);
638
639 mode = stat->st_mode & S_IALLUGO;
640 mode |= inode->i_mode & ~S_IALLUGO;
641 inode->i_mode = mode;
642
643 i_size_write(inode, stat->st_size);
644 inode->i_blocks = stat->st_blocks;
645 } else {
646 if (stat->st_result_mask & P9_STATS_ATIME) {
647 inode->i_atime.tv_sec = stat->st_atime_sec;
648 inode->i_atime.tv_nsec = stat->st_atime_nsec;
649 }
650 if (stat->st_result_mask & P9_STATS_MTIME) {
651 inode->i_mtime.tv_sec = stat->st_mtime_sec;
652 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
653 }
654 if (stat->st_result_mask & P9_STATS_CTIME) {
655 inode->i_ctime.tv_sec = stat->st_ctime_sec;
656 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
657 }
658 if (stat->st_result_mask & P9_STATS_UID)
659 inode->i_uid = stat->st_uid;
660 if (stat->st_result_mask & P9_STATS_GID)
661 inode->i_gid = stat->st_gid;
662 if (stat->st_result_mask & P9_STATS_NLINK)
663 set_nlink(inode, stat->st_nlink);
664 if (stat->st_result_mask & P9_STATS_MODE) {
665 inode->i_mode = stat->st_mode;
666 if ((S_ISBLK(inode->i_mode)) ||
667 (S_ISCHR(inode->i_mode)))
668 init_special_inode(inode, inode->i_mode,
669 inode->i_rdev);
670 }
671 if (stat->st_result_mask & P9_STATS_RDEV)
672 inode->i_rdev = new_decode_dev(stat->st_rdev);
673 if (stat->st_result_mask & P9_STATS_SIZE)
674 i_size_write(inode, stat->st_size);
675 if (stat->st_result_mask & P9_STATS_BLOCKS)
676 inode->i_blocks = stat->st_blocks;
677 }
678 if (stat->st_result_mask & P9_STATS_GEN)
679 inode->i_generation = stat->st_gen;
680
681 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
682 * because the inode structure does not have fields for them.
683 */
684 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
685 }
686
687 static int
688 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
689 const char *symname)
690 {
691 int err;
692 kgid_t gid;
693 char *name;
694 struct p9_qid qid;
695 struct inode *inode;
696 struct p9_fid *dfid;
697 struct p9_fid *fid = NULL;
698 struct v9fs_session_info *v9ses;
699
700 name = (char *) dentry->d_name.name;
701 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
702 v9ses = v9fs_inode2v9ses(dir);
703
704 dfid = v9fs_fid_lookup(dentry->d_parent);
705 if (IS_ERR(dfid)) {
706 err = PTR_ERR(dfid);
707 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
708 return err;
709 }
710
711 gid = v9fs_get_fsgid_for_create(dir);
712
713 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
714 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
715
716 if (err < 0) {
717 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
718 goto error;
719 }
720
721 v9fs_invalidate_inode_attr(dir);
722 if (v9ses->cache) {
723 /* Now walk from the parent so we can get an unopened fid. */
724 fid = p9_client_walk(dfid, 1, &name, 1);
725 if (IS_ERR(fid)) {
726 err = PTR_ERR(fid);
727 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
728 err);
729 fid = NULL;
730 goto error;
731 }
732
733 /* instantiate inode and assign the unopened fid to dentry */
734 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
735 if (IS_ERR(inode)) {
736 err = PTR_ERR(inode);
737 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
738 err);
739 goto error;
740 }
741 v9fs_fid_add(dentry, fid);
742 d_instantiate(dentry, inode);
743 fid = NULL;
744 err = 0;
745 } else {
746 /* Not in cached mode. No need to populate inode with stat */
747 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
748 if (IS_ERR(inode)) {
749 err = PTR_ERR(inode);
750 goto error;
751 }
752 d_instantiate(dentry, inode);
753 }
754
755 error:
756 if (fid)
757 p9_client_clunk(fid);
758
759 return err;
760 }
761
762 /**
763 * v9fs_vfs_link_dotl - create a hardlink for dotl
764 * @old_dentry: dentry for file to link to
765 * @dir: inode destination for new link
766 * @dentry: dentry for link
767 *
768 */
769
770 static int
771 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
772 struct dentry *dentry)
773 {
774 int err;
775 char *name;
776 struct dentry *dir_dentry;
777 struct p9_fid *dfid, *oldfid;
778 struct v9fs_session_info *v9ses;
779
780 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
781 dir->i_ino, old_dentry->d_name.name, dentry->d_name.name);
782
783 v9ses = v9fs_inode2v9ses(dir);
784 dir_dentry = dentry->d_parent;
785 dfid = v9fs_fid_lookup(dir_dentry);
786 if (IS_ERR(dfid))
787 return PTR_ERR(dfid);
788
789 oldfid = v9fs_fid_lookup(old_dentry);
790 if (IS_ERR(oldfid))
791 return PTR_ERR(oldfid);
792
793 name = (char *) dentry->d_name.name;
794
795 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
796
797 if (err < 0) {
798 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
799 return err;
800 }
801
802 v9fs_invalidate_inode_attr(dir);
803 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
804 /* Get the latest stat info from server. */
805 struct p9_fid *fid;
806 fid = v9fs_fid_lookup(old_dentry);
807 if (IS_ERR(fid))
808 return PTR_ERR(fid);
809
810 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
811 }
812 ihold(old_dentry->d_inode);
813 d_instantiate(dentry, old_dentry->d_inode);
814
815 return err;
816 }
817
818 /**
819 * v9fs_vfs_mknod_dotl - create a special file
820 * @dir: inode destination for new link
821 * @dentry: dentry for file
822 * @mode: mode for creation
823 * @rdev: device associated with special file
824 *
825 */
826 static int
827 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
828 dev_t rdev)
829 {
830 int err;
831 kgid_t gid;
832 char *name;
833 umode_t mode;
834 struct v9fs_session_info *v9ses;
835 struct p9_fid *fid = NULL, *dfid = NULL;
836 struct inode *inode;
837 struct p9_qid qid;
838 struct dentry *dir_dentry;
839 struct posix_acl *dacl = NULL, *pacl = NULL;
840
841 p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n",
842 dir->i_ino, dentry->d_name.name, omode,
843 MAJOR(rdev), MINOR(rdev));
844
845 if (!new_valid_dev(rdev))
846 return -EINVAL;
847
848 v9ses = v9fs_inode2v9ses(dir);
849 dir_dentry = dentry->d_parent;
850 dfid = v9fs_fid_lookup(dir_dentry);
851 if (IS_ERR(dfid)) {
852 err = PTR_ERR(dfid);
853 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
854 dfid = NULL;
855 goto error;
856 }
857
858 gid = v9fs_get_fsgid_for_create(dir);
859 mode = omode;
860 /* Update mode based on ACL value */
861 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
862 if (err) {
863 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
864 err);
865 goto error;
866 }
867 name = (char *) dentry->d_name.name;
868
869 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
870 if (err < 0)
871 goto error;
872
873 v9fs_invalidate_inode_attr(dir);
874 fid = p9_client_walk(dfid, 1, &name, 1);
875 if (IS_ERR(fid)) {
876 err = PTR_ERR(fid);
877 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
878 err);
879 fid = NULL;
880 goto error;
881 }
882
883 /* instantiate inode and assign the unopened fid to the dentry */
884 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
885 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
886 if (IS_ERR(inode)) {
887 err = PTR_ERR(inode);
888 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
889 err);
890 goto error;
891 }
892 v9fs_set_create_acl(inode, fid, dacl, pacl);
893 v9fs_fid_add(dentry, fid);
894 d_instantiate(dentry, inode);
895 fid = NULL;
896 err = 0;
897 } else {
898 /*
899 * Not in cached mode. No need to populate inode with stat.
900 * socket syscall returns a fd, so we need instantiate
901 */
902 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
903 if (IS_ERR(inode)) {
904 err = PTR_ERR(inode);
905 goto error;
906 }
907 v9fs_set_create_acl(inode, fid, dacl, pacl);
908 d_instantiate(dentry, inode);
909 }
910 error:
911 if (fid)
912 p9_client_clunk(fid);
913 v9fs_put_acl(dacl, pacl);
914 return err;
915 }
916
917 /**
918 * v9fs_vfs_follow_link_dotl - follow a symlink path
919 * @dentry: dentry for symlink
920 * @nd: nameidata
921 *
922 */
923
924 static void *
925 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
926 {
927 int retval;
928 struct p9_fid *fid;
929 char *link = __getname();
930 char *target;
931
932 p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
933
934 if (!link) {
935 link = ERR_PTR(-ENOMEM);
936 goto ndset;
937 }
938 fid = v9fs_fid_lookup(dentry);
939 if (IS_ERR(fid)) {
940 __putname(link);
941 link = ERR_CAST(fid);
942 goto ndset;
943 }
944 retval = p9_client_readlink(fid, &target);
945 if (!retval) {
946 strcpy(link, target);
947 kfree(target);
948 goto ndset;
949 }
950 __putname(link);
951 link = ERR_PTR(retval);
952 ndset:
953 nd_set_link(nd, link);
954 return NULL;
955 }
956
957 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
958 {
959 loff_t i_size;
960 struct p9_stat_dotl *st;
961 struct v9fs_session_info *v9ses;
962
963 v9ses = v9fs_inode2v9ses(inode);
964 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
965 if (IS_ERR(st))
966 return PTR_ERR(st);
967 /*
968 * Don't update inode if the file type is different
969 */
970 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
971 goto out;
972
973 spin_lock(&inode->i_lock);
974 /*
975 * We don't want to refresh inode->i_size,
976 * because we may have cached data
977 */
978 i_size = inode->i_size;
979 v9fs_stat2inode_dotl(st, inode);
980 if (v9ses->cache)
981 inode->i_size = i_size;
982 spin_unlock(&inode->i_lock);
983 out:
984 kfree(st);
985 return 0;
986 }
987
988 const struct inode_operations v9fs_dir_inode_operations_dotl = {
989 .create = v9fs_vfs_create_dotl,
990 .atomic_open = v9fs_vfs_atomic_open_dotl,
991 .lookup = v9fs_vfs_lookup,
992 .link = v9fs_vfs_link_dotl,
993 .symlink = v9fs_vfs_symlink_dotl,
994 .unlink = v9fs_vfs_unlink,
995 .mkdir = v9fs_vfs_mkdir_dotl,
996 .rmdir = v9fs_vfs_rmdir,
997 .mknod = v9fs_vfs_mknod_dotl,
998 .rename = v9fs_vfs_rename,
999 .getattr = v9fs_vfs_getattr_dotl,
1000 .setattr = v9fs_vfs_setattr_dotl,
1001 .setxattr = generic_setxattr,
1002 .getxattr = generic_getxattr,
1003 .removexattr = generic_removexattr,
1004 .listxattr = v9fs_listxattr,
1005 .get_acl = v9fs_iop_get_acl,
1006 };
1007
1008 const struct inode_operations v9fs_file_inode_operations_dotl = {
1009 .getattr = v9fs_vfs_getattr_dotl,
1010 .setattr = v9fs_vfs_setattr_dotl,
1011 .setxattr = generic_setxattr,
1012 .getxattr = generic_getxattr,
1013 .removexattr = generic_removexattr,
1014 .listxattr = v9fs_listxattr,
1015 .get_acl = v9fs_iop_get_acl,
1016 };
1017
1018 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
1019 .readlink = generic_readlink,
1020 .follow_link = v9fs_vfs_follow_link_dotl,
1021 .put_link = v9fs_vfs_put_link,
1022 .getattr = v9fs_vfs_getattr_dotl,
1023 .setattr = v9fs_vfs_setattr_dotl,
1024 .setxattr = generic_setxattr,
1025 .getxattr = generic_getxattr,
1026 .removexattr = generic_removexattr,
1027 .listxattr = v9fs_listxattr,
1028 };
Linux with added FPC-III support