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usb: ohci-at91: use descriptor-based gpio APIs correctly
[linux/fpc-iii.git] / fs / 9p / vfs_inode_dotl.c
blob5999bd050678cd333ffa0f7e6e88f6a575e5a885
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_in_lookup(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_parent_fid(dentry);
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 = clone_fid(dfid);
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 posix_acl *dacl = NULL, *pacl = NULL;
393
394 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
395 err = 0;
396 v9ses = v9fs_inode2v9ses(dir);
397
398 omode |= S_IFDIR;
399 if (dir->i_mode & S_ISGID)
400 omode |= S_ISGID;
401
402 dfid = v9fs_parent_fid(dentry);
403 if (IS_ERR(dfid)) {
404 err = PTR_ERR(dfid);
405 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
406 dfid = NULL;
407 goto error;
408 }
409
410 gid = v9fs_get_fsgid_for_create(dir);
411 mode = omode;
412 /* Update mode based on ACL value */
413 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
414 if (err) {
415 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
416 err);
417 goto error;
418 }
419 name = (char *) dentry->d_name.name;
420 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
421 if (err < 0)
422 goto error;
423
424 fid = p9_client_walk(dfid, 1, &name, 1);
425 if (IS_ERR(fid)) {
426 err = PTR_ERR(fid);
427 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
428 err);
429 fid = NULL;
430 goto error;
431 }
432
433 /* instantiate inode and assign the unopened fid to the dentry */
434 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
435 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
436 if (IS_ERR(inode)) {
437 err = PTR_ERR(inode);
438 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
439 err);
440 goto error;
441 }
442 v9fs_fid_add(dentry, fid);
443 v9fs_set_create_acl(inode, fid, dacl, pacl);
444 d_instantiate(dentry, inode);
445 fid = NULL;
446 err = 0;
447 } else {
448 /*
449 * Not in cached mode. No need to populate
450 * inode with stat. We need to get an inode
451 * so that we can set the acl with dentry
452 */
453 inode = v9fs_get_inode(dir->i_sb, mode, 0);
454 if (IS_ERR(inode)) {
455 err = PTR_ERR(inode);
456 goto error;
457 }
458 v9fs_set_create_acl(inode, fid, dacl, pacl);
459 d_instantiate(dentry, inode);
460 }
461 inc_nlink(dir);
462 v9fs_invalidate_inode_attr(dir);
463 error:
464 if (fid)
465 p9_client_clunk(fid);
466 v9fs_put_acl(dacl, pacl);
467 return err;
468 }
469
470 static int
471 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
472 struct kstat *stat)
473 {
474 struct v9fs_session_info *v9ses;
475 struct p9_fid *fid;
476 struct p9_stat_dotl *st;
477
478 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
479 v9ses = v9fs_dentry2v9ses(dentry);
480 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
481 generic_fillattr(d_inode(dentry), stat);
482 return 0;
483 }
484 fid = v9fs_fid_lookup(dentry);
485 if (IS_ERR(fid))
486 return PTR_ERR(fid);
487
488 /* Ask for all the fields in stat structure. Server will return
489 * whatever it supports
490 */
491
492 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
493 if (IS_ERR(st))
494 return PTR_ERR(st);
495
496 v9fs_stat2inode_dotl(st, d_inode(dentry));
497 generic_fillattr(d_inode(dentry), stat);
498 /* Change block size to what the server returned */
499 stat->blksize = st->st_blksize;
500
501 kfree(st);
502 return 0;
503 }
504
505 /*
506 * Attribute flags.
507 */
508 #define P9_ATTR_MODE (1 << 0)
509 #define P9_ATTR_UID (1 << 1)
510 #define P9_ATTR_GID (1 << 2)
511 #define P9_ATTR_SIZE (1 << 3)
512 #define P9_ATTR_ATIME (1 << 4)
513 #define P9_ATTR_MTIME (1 << 5)
514 #define P9_ATTR_CTIME (1 << 6)
515 #define P9_ATTR_ATIME_SET (1 << 7)
516 #define P9_ATTR_MTIME_SET (1 << 8)
517
518 struct dotl_iattr_map {
519 int iattr_valid;
520 int p9_iattr_valid;
521 };
522
523 static int v9fs_mapped_iattr_valid(int iattr_valid)
524 {
525 int i;
526 int p9_iattr_valid = 0;
527 struct dotl_iattr_map dotl_iattr_map[] = {
528 { ATTR_MODE, P9_ATTR_MODE },
529 { ATTR_UID, P9_ATTR_UID },
530 { ATTR_GID, P9_ATTR_GID },
531 { ATTR_SIZE, P9_ATTR_SIZE },
532 { ATTR_ATIME, P9_ATTR_ATIME },
533 { ATTR_MTIME, P9_ATTR_MTIME },
534 { ATTR_CTIME, P9_ATTR_CTIME },
535 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET },
536 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET },
537 };
538 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
539 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
540 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
541 }
542 return p9_iattr_valid;
543 }
544
545 /**
546 * v9fs_vfs_setattr_dotl - set file metadata
547 * @dentry: file whose metadata to set
548 * @iattr: metadata assignment structure
549 *
550 */
551
552 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
553 {
554 int retval;
555 struct p9_fid *fid;
556 struct p9_iattr_dotl p9attr;
557 struct inode *inode = d_inode(dentry);
558
559 p9_debug(P9_DEBUG_VFS, "\n");
560
561 retval = setattr_prepare(dentry, iattr);
562 if (retval)
563 return retval;
564
565 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
566 p9attr.mode = iattr->ia_mode;
567 p9attr.uid = iattr->ia_uid;
568 p9attr.gid = iattr->ia_gid;
569 p9attr.size = iattr->ia_size;
570 p9attr.atime_sec = iattr->ia_atime.tv_sec;
571 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
572 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
573 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
574
575 fid = v9fs_fid_lookup(dentry);
576 if (IS_ERR(fid))
577 return PTR_ERR(fid);
578
579 /* Write all dirty data */
580 if (S_ISREG(inode->i_mode))
581 filemap_write_and_wait(inode->i_mapping);
582
583 retval = p9_client_setattr(fid, &p9attr);
584 if (retval < 0)
585 return retval;
586
587 if ((iattr->ia_valid & ATTR_SIZE) &&
588 iattr->ia_size != i_size_read(inode))
589 truncate_setsize(inode, iattr->ia_size);
590
591 v9fs_invalidate_inode_attr(inode);
592 setattr_copy(inode, iattr);
593 mark_inode_dirty(inode);
594 if (iattr->ia_valid & ATTR_MODE) {
595 /* We also want to update ACL when we update mode bits */
596 retval = v9fs_acl_chmod(inode, fid);
597 if (retval < 0)
598 return retval;
599 }
600 return 0;
601 }
602
603 /**
604 * v9fs_stat2inode_dotl - populate an inode structure with stat info
605 * @stat: stat structure
606 * @inode: inode to populate
607 *
608 */
609
610 void
611 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
612 {
613 umode_t mode;
614 struct v9fs_inode *v9inode = V9FS_I(inode);
615
616 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
617 inode->i_atime.tv_sec = stat->st_atime_sec;
618 inode->i_atime.tv_nsec = stat->st_atime_nsec;
619 inode->i_mtime.tv_sec = stat->st_mtime_sec;
620 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
621 inode->i_ctime.tv_sec = stat->st_ctime_sec;
622 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
623 inode->i_uid = stat->st_uid;
624 inode->i_gid = stat->st_gid;
625 set_nlink(inode, stat->st_nlink);
626
627 mode = stat->st_mode & S_IALLUGO;
628 mode |= inode->i_mode & ~S_IALLUGO;
629 inode->i_mode = mode;
630
631 i_size_write(inode, stat->st_size);
632 inode->i_blocks = stat->st_blocks;
633 } else {
634 if (stat->st_result_mask & P9_STATS_ATIME) {
635 inode->i_atime.tv_sec = stat->st_atime_sec;
636 inode->i_atime.tv_nsec = stat->st_atime_nsec;
637 }
638 if (stat->st_result_mask & P9_STATS_MTIME) {
639 inode->i_mtime.tv_sec = stat->st_mtime_sec;
640 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
641 }
642 if (stat->st_result_mask & P9_STATS_CTIME) {
643 inode->i_ctime.tv_sec = stat->st_ctime_sec;
644 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
645 }
646 if (stat->st_result_mask & P9_STATS_UID)
647 inode->i_uid = stat->st_uid;
648 if (stat->st_result_mask & P9_STATS_GID)
649 inode->i_gid = stat->st_gid;
650 if (stat->st_result_mask & P9_STATS_NLINK)
651 set_nlink(inode, stat->st_nlink);
652 if (stat->st_result_mask & P9_STATS_MODE) {
653 inode->i_mode = stat->st_mode;
654 if ((S_ISBLK(inode->i_mode)) ||
655 (S_ISCHR(inode->i_mode)))
656 init_special_inode(inode, inode->i_mode,
657 inode->i_rdev);
658 }
659 if (stat->st_result_mask & P9_STATS_RDEV)
660 inode->i_rdev = new_decode_dev(stat->st_rdev);
661 if (stat->st_result_mask & P9_STATS_SIZE)
662 i_size_write(inode, stat->st_size);
663 if (stat->st_result_mask & P9_STATS_BLOCKS)
664 inode->i_blocks = stat->st_blocks;
665 }
666 if (stat->st_result_mask & P9_STATS_GEN)
667 inode->i_generation = stat->st_gen;
668
669 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
670 * because the inode structure does not have fields for them.
671 */
672 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
673 }
674
675 static int
676 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
677 const char *symname)
678 {
679 int err;
680 kgid_t gid;
681 char *name;
682 struct p9_qid qid;
683 struct inode *inode;
684 struct p9_fid *dfid;
685 struct p9_fid *fid = NULL;
686 struct v9fs_session_info *v9ses;
687
688 name = (char *) dentry->d_name.name;
689 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
690 v9ses = v9fs_inode2v9ses(dir);
691
692 dfid = v9fs_parent_fid(dentry);
693 if (IS_ERR(dfid)) {
694 err = PTR_ERR(dfid);
695 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
696 return err;
697 }
698
699 gid = v9fs_get_fsgid_for_create(dir);
700
701 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
702 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
703
704 if (err < 0) {
705 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
706 goto error;
707 }
708
709 v9fs_invalidate_inode_attr(dir);
710 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
711 /* Now walk from the parent so we can get an unopened fid. */
712 fid = p9_client_walk(dfid, 1, &name, 1);
713 if (IS_ERR(fid)) {
714 err = PTR_ERR(fid);
715 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
716 err);
717 fid = NULL;
718 goto error;
719 }
720
721 /* instantiate inode and assign the unopened fid to dentry */
722 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
723 if (IS_ERR(inode)) {
724 err = PTR_ERR(inode);
725 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
726 err);
727 goto error;
728 }
729 v9fs_fid_add(dentry, fid);
730 d_instantiate(dentry, inode);
731 fid = NULL;
732 err = 0;
733 } else {
734 /* Not in cached mode. No need to populate inode with stat */
735 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
736 if (IS_ERR(inode)) {
737 err = PTR_ERR(inode);
738 goto error;
739 }
740 d_instantiate(dentry, inode);
741 }
742
743 error:
744 if (fid)
745 p9_client_clunk(fid);
746
747 return err;
748 }
749
750 /**
751 * v9fs_vfs_link_dotl - create a hardlink for dotl
752 * @old_dentry: dentry for file to link to
753 * @dir: inode destination for new link
754 * @dentry: dentry for link
755 *
756 */
757
758 static int
759 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
760 struct dentry *dentry)
761 {
762 int err;
763 struct p9_fid *dfid, *oldfid;
764 struct v9fs_session_info *v9ses;
765
766 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
767 dir->i_ino, old_dentry, dentry);
768
769 v9ses = v9fs_inode2v9ses(dir);
770 dfid = v9fs_parent_fid(dentry);
771 if (IS_ERR(dfid))
772 return PTR_ERR(dfid);
773
774 oldfid = v9fs_fid_lookup(old_dentry);
775 if (IS_ERR(oldfid))
776 return PTR_ERR(oldfid);
777
778 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
779
780 if (err < 0) {
781 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
782 return err;
783 }
784
785 v9fs_invalidate_inode_attr(dir);
786 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
787 /* Get the latest stat info from server. */
788 struct p9_fid *fid;
789 fid = v9fs_fid_lookup(old_dentry);
790 if (IS_ERR(fid))
791 return PTR_ERR(fid);
792
793 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
794 }
795 ihold(d_inode(old_dentry));
796 d_instantiate(dentry, d_inode(old_dentry));
797
798 return err;
799 }
800
801 /**
802 * v9fs_vfs_mknod_dotl - create a special file
803 * @dir: inode destination for new link
804 * @dentry: dentry for file
805 * @omode: mode for creation
806 * @rdev: device associated with special file
807 *
808 */
809 static int
810 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
811 dev_t rdev)
812 {
813 int err;
814 kgid_t gid;
815 char *name;
816 umode_t mode;
817 struct v9fs_session_info *v9ses;
818 struct p9_fid *fid = NULL, *dfid = NULL;
819 struct inode *inode;
820 struct p9_qid qid;
821 struct posix_acl *dacl = NULL, *pacl = NULL;
822
823 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
824 dir->i_ino, dentry, omode,
825 MAJOR(rdev), MINOR(rdev));
826
827 v9ses = v9fs_inode2v9ses(dir);
828 dfid = v9fs_parent_fid(dentry);
829 if (IS_ERR(dfid)) {
830 err = PTR_ERR(dfid);
831 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
832 dfid = NULL;
833 goto error;
834 }
835
836 gid = v9fs_get_fsgid_for_create(dir);
837 mode = omode;
838 /* Update mode based on ACL value */
839 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
840 if (err) {
841 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
842 err);
843 goto error;
844 }
845 name = (char *) dentry->d_name.name;
846
847 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
848 if (err < 0)
849 goto error;
850
851 v9fs_invalidate_inode_attr(dir);
852 fid = p9_client_walk(dfid, 1, &name, 1);
853 if (IS_ERR(fid)) {
854 err = PTR_ERR(fid);
855 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
856 err);
857 fid = NULL;
858 goto error;
859 }
860
861 /* instantiate inode and assign the unopened fid to the dentry */
862 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
863 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
864 if (IS_ERR(inode)) {
865 err = PTR_ERR(inode);
866 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
867 err);
868 goto error;
869 }
870 v9fs_set_create_acl(inode, fid, dacl, pacl);
871 v9fs_fid_add(dentry, fid);
872 d_instantiate(dentry, inode);
873 fid = NULL;
874 err = 0;
875 } else {
876 /*
877 * Not in cached mode. No need to populate inode with stat.
878 * socket syscall returns a fd, so we need instantiate
879 */
880 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
881 if (IS_ERR(inode)) {
882 err = PTR_ERR(inode);
883 goto error;
884 }
885 v9fs_set_create_acl(inode, fid, dacl, pacl);
886 d_instantiate(dentry, inode);
887 }
888 error:
889 if (fid)
890 p9_client_clunk(fid);
891 v9fs_put_acl(dacl, pacl);
892 return err;
893 }
894
895 /**
896 * v9fs_vfs_get_link_dotl - follow a symlink path
897 * @dentry: dentry for symlink
898 * @inode: inode for symlink
899 * @done: destructor for return value
900 */
901
902 static const char *
903 v9fs_vfs_get_link_dotl(struct dentry *dentry,
904 struct inode *inode,
905 struct delayed_call *done)
906 {
907 struct p9_fid *fid;
908 char *target;
909 int retval;
910
911 if (!dentry)
912 return ERR_PTR(-ECHILD);
913
914 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
915
916 fid = v9fs_fid_lookup(dentry);
917 if (IS_ERR(fid))
918 return ERR_CAST(fid);
919 retval = p9_client_readlink(fid, &target);
920 if (retval)
921 return ERR_PTR(retval);
922 set_delayed_call(done, kfree_link, target);
923 return target;
924 }
925
926 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
927 {
928 loff_t i_size;
929 struct p9_stat_dotl *st;
930 struct v9fs_session_info *v9ses;
931
932 v9ses = v9fs_inode2v9ses(inode);
933 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
934 if (IS_ERR(st))
935 return PTR_ERR(st);
936 /*
937 * Don't update inode if the file type is different
938 */
939 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
940 goto out;
941
942 spin_lock(&inode->i_lock);
943 /*
944 * We don't want to refresh inode->i_size,
945 * because we may have cached data
946 */
947 i_size = inode->i_size;
948 v9fs_stat2inode_dotl(st, inode);
949 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
950 inode->i_size = i_size;
951 spin_unlock(&inode->i_lock);
952 out:
953 kfree(st);
954 return 0;
955 }
956
957 const struct inode_operations v9fs_dir_inode_operations_dotl = {
958 .create = v9fs_vfs_create_dotl,
959 .atomic_open = v9fs_vfs_atomic_open_dotl,
960 .lookup = v9fs_vfs_lookup,
961 .link = v9fs_vfs_link_dotl,
962 .symlink = v9fs_vfs_symlink_dotl,
963 .unlink = v9fs_vfs_unlink,
964 .mkdir = v9fs_vfs_mkdir_dotl,
965 .rmdir = v9fs_vfs_rmdir,
966 .mknod = v9fs_vfs_mknod_dotl,
967 .rename = v9fs_vfs_rename,
968 .getattr = v9fs_vfs_getattr_dotl,
969 .setattr = v9fs_vfs_setattr_dotl,
970 .listxattr = v9fs_listxattr,
971 .get_acl = v9fs_iop_get_acl,
972 };
973
974 const struct inode_operations v9fs_file_inode_operations_dotl = {
975 .getattr = v9fs_vfs_getattr_dotl,
976 .setattr = v9fs_vfs_setattr_dotl,
977 .listxattr = v9fs_listxattr,
978 .get_acl = v9fs_iop_get_acl,
979 };
980
981 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
982 .get_link = v9fs_vfs_get_link_dotl,
983 .getattr = v9fs_vfs_getattr_dotl,
984 .setattr = v9fs_vfs_setattr_dotl,
985 .listxattr = v9fs_listxattr,
986 };
Linux with added FPC-III support