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mm/vmscan.c: prevent useless kswapd loops
[linux/fpc-iii.git] / fs / 9p / vfs_inode_dotl.c
bloba950a927a626f2bad92969b3f617ee68a04d3336
1 /*
2 * linux/fs/9p/vfs_inode_dotl.c
3 *
4 * This file contains vfs inode ops for the 9P2000.L protocol.
5 *
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26 #include <linux/module.h>
27 #include <linux/errno.h>
28 #include <linux/fs.h>
29 #include <linux/file.h>
30 #include <linux/pagemap.h>
31 #include <linux/stat.h>
32 #include <linux/string.h>
33 #include <linux/inet.h>
34 #include <linux/namei.h>
35 #include <linux/idr.h>
36 #include <linux/sched.h>
37 #include <linux/slab.h>
38 #include <linux/xattr.h>
39 #include <linux/posix_acl.h>
40 #include <net/9p/9p.h>
41 #include <net/9p/client.h>
42
43 #include "v9fs.h"
44 #include "v9fs_vfs.h"
45 #include "fid.h"
46 #include "cache.h"
47 #include "xattr.h"
48 #include "acl.h"
49
50 static int
51 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
52 dev_t rdev);
53
54 /**
55 * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
56 * new file system object. This checks the S_ISGID to determine the owning
57 * group of the new file system object.
58 */
59
60 static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
61 {
62 BUG_ON(dir_inode == NULL);
63
64 if (dir_inode->i_mode & S_ISGID) {
65 /* set_gid bit is set.*/
66 return dir_inode->i_gid;
67 }
68 return current_fsgid();
69 }
70
71 static int v9fs_test_inode_dotl(struct inode *inode, void *data)
72 {
73 struct v9fs_inode *v9inode = V9FS_I(inode);
74 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
75
76 /* don't match inode of different type */
77 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
78 return 0;
79
80 if (inode->i_generation != st->st_gen)
81 return 0;
82
83 /* compare qid details */
84 if (memcmp(&v9inode->qid.version,
85 &st->qid.version, sizeof(v9inode->qid.version)))
86 return 0;
87
88 if (v9inode->qid.type != st->qid.type)
89 return 0;
90
91 if (v9inode->qid.path != st->qid.path)
92 return 0;
93 return 1;
94 }
95
96 /* Always get a new inode */
97 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
98 {
99 return 0;
100 }
101
102 static int v9fs_set_inode_dotl(struct inode *inode, void *data)
103 {
104 struct v9fs_inode *v9inode = V9FS_I(inode);
105 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
106
107 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
108 inode->i_generation = st->st_gen;
109 return 0;
110 }
111
112 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
113 struct p9_qid *qid,
114 struct p9_fid *fid,
115 struct p9_stat_dotl *st,
116 int new)
117 {
118 int retval;
119 unsigned long i_ino;
120 struct inode *inode;
121 struct v9fs_session_info *v9ses = sb->s_fs_info;
122 int (*test)(struct inode *, void *);
123
124 if (new)
125 test = v9fs_test_new_inode_dotl;
126 else
127 test = v9fs_test_inode_dotl;
128
129 i_ino = v9fs_qid2ino(qid);
130 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
131 if (!inode)
132 return ERR_PTR(-ENOMEM);
133 if (!(inode->i_state & I_NEW))
134 return inode;
135 /*
136 * initialize the inode with the stat info
137 * FIXME!! we may need support for stale inodes
138 * later.
139 */
140 inode->i_ino = i_ino;
141 retval = v9fs_init_inode(v9ses, inode,
142 st->st_mode, new_decode_dev(st->st_rdev));
143 if (retval)
144 goto error;
145
146 v9fs_stat2inode_dotl(st, inode, 0);
147 v9fs_cache_inode_get_cookie(inode);
148 retval = v9fs_get_acl(inode, fid);
149 if (retval)
150 goto error;
151
152 unlock_new_inode(inode);
153 return inode;
154 error:
155 iget_failed(inode);
156 return ERR_PTR(retval);
157
158 }
159
160 struct inode *
161 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
162 struct super_block *sb, int new)
163 {
164 struct p9_stat_dotl *st;
165 struct inode *inode = NULL;
166
167 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
168 if (IS_ERR(st))
169 return ERR_CAST(st);
170
171 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
172 kfree(st);
173 return inode;
174 }
175
176 struct dotl_openflag_map {
177 int open_flag;
178 int dotl_flag;
179 };
180
181 static int v9fs_mapped_dotl_flags(int flags)
182 {
183 int i;
184 int rflags = 0;
185 struct dotl_openflag_map dotl_oflag_map[] = {
186 { O_CREAT, P9_DOTL_CREATE },
187 { O_EXCL, P9_DOTL_EXCL },
188 { O_NOCTTY, P9_DOTL_NOCTTY },
189 { O_APPEND, P9_DOTL_APPEND },
190 { O_NONBLOCK, P9_DOTL_NONBLOCK },
191 { O_DSYNC, P9_DOTL_DSYNC },
192 { FASYNC, P9_DOTL_FASYNC },
193 { O_DIRECT, P9_DOTL_DIRECT },
194 { O_LARGEFILE, P9_DOTL_LARGEFILE },
195 { O_DIRECTORY, P9_DOTL_DIRECTORY },
196 { O_NOFOLLOW, P9_DOTL_NOFOLLOW },
197 { O_NOATIME, P9_DOTL_NOATIME },
198 { O_CLOEXEC, P9_DOTL_CLOEXEC },
199 { O_SYNC, P9_DOTL_SYNC},
200 };
201 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
202 if (flags & dotl_oflag_map[i].open_flag)
203 rflags |= dotl_oflag_map[i].dotl_flag;
204 }
205 return rflags;
206 }
207
208 /**
209 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
210 * plan 9 open flag.
211 * @flags: flags to convert
212 */
213 int v9fs_open_to_dotl_flags(int flags)
214 {
215 int rflags = 0;
216
217 /*
218 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
219 * and P9_DOTL_NOACCESS
220 */
221 rflags |= flags & O_ACCMODE;
222 rflags |= v9fs_mapped_dotl_flags(flags);
223
224 return rflags;
225 }
226
227 /**
228 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
229 * @dir: directory inode that is being created
230 * @dentry: dentry that is being deleted
231 * @omode: create permissions
232 *
233 */
234
235 static int
236 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
237 bool excl)
238 {
239 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
240 }
241
242 static int
243 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
244 struct file *file, unsigned flags, umode_t omode)
245 {
246 int err = 0;
247 kgid_t gid;
248 umode_t mode;
249 const unsigned char *name = NULL;
250 struct p9_qid qid;
251 struct inode *inode;
252 struct p9_fid *fid = NULL;
253 struct v9fs_inode *v9inode;
254 struct p9_fid *dfid, *ofid, *inode_fid;
255 struct v9fs_session_info *v9ses;
256 struct posix_acl *pacl = NULL, *dacl = NULL;
257 struct dentry *res = NULL;
258
259 if (d_in_lookup(dentry)) {
260 res = v9fs_vfs_lookup(dir, dentry, 0);
261 if (IS_ERR(res))
262 return PTR_ERR(res);
263
264 if (res)
265 dentry = res;
266 }
267
268 /* Only creates */
269 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
270 return finish_no_open(file, res);
271
272 v9ses = v9fs_inode2v9ses(dir);
273
274 name = dentry->d_name.name;
275 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
276 name, flags, omode);
277
278 dfid = v9fs_parent_fid(dentry);
279 if (IS_ERR(dfid)) {
280 err = PTR_ERR(dfid);
281 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
282 goto out;
283 }
284
285 /* clone a fid to use for creation */
286 ofid = clone_fid(dfid);
287 if (IS_ERR(ofid)) {
288 err = PTR_ERR(ofid);
289 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
290 goto out;
291 }
292
293 gid = v9fs_get_fsgid_for_create(dir);
294
295 mode = omode;
296 /* Update mode based on ACL value */
297 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
298 if (err) {
299 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
300 err);
301 goto error;
302 }
303 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
304 mode, gid, &qid);
305 if (err < 0) {
306 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
307 err);
308 goto error;
309 }
310 v9fs_invalidate_inode_attr(dir);
311
312 /* instantiate inode and assign the unopened fid to the dentry */
313 fid = p9_client_walk(dfid, 1, &name, 1);
314 if (IS_ERR(fid)) {
315 err = PTR_ERR(fid);
316 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
317 fid = NULL;
318 goto error;
319 }
320 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
321 if (IS_ERR(inode)) {
322 err = PTR_ERR(inode);
323 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
324 goto error;
325 }
326 /* Now set the ACL based on the default value */
327 v9fs_set_create_acl(inode, fid, dacl, pacl);
328
329 v9fs_fid_add(dentry, fid);
330 d_instantiate(dentry, inode);
331
332 v9inode = V9FS_I(inode);
333 mutex_lock(&v9inode->v_mutex);
334 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
335 !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);
355 if (err)
356 goto err_clunk_old_fid;
357 file->private_data = ofid;
358 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
359 v9fs_cache_inode_set_cookie(inode, file);
360 file->f_mode |= FMODE_CREATED;
361 out:
362 v9fs_put_acl(dacl, pacl);
363 dput(res);
364 return err;
365
366 error:
367 if (fid)
368 p9_client_clunk(fid);
369 err_clunk_old_fid:
370 if (ofid)
371 p9_client_clunk(ofid);
372 goto out;
373 }
374
375 /**
376 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
377 * @dir: inode that is being unlinked
378 * @dentry: dentry that is being unlinked
379 * @omode: mode for new directory
380 *
381 */
382
383 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
384 struct dentry *dentry, umode_t omode)
385 {
386 int err;
387 struct v9fs_session_info *v9ses;
388 struct p9_fid *fid = NULL, *dfid = NULL;
389 kgid_t gid;
390 const unsigned char *name;
391 umode_t mode;
392 struct inode *inode;
393 struct p9_qid qid;
394 struct posix_acl *dacl = NULL, *pacl = NULL;
395
396 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
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 dfid = v9fs_parent_fid(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 = 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(const struct path *path, struct kstat *stat,
474 u32 request_mask, unsigned int flags)
475 {
476 struct dentry *dentry = path->dentry;
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(d_inode(dentry), 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, d_inode(dentry), 0);
500 generic_fillattr(d_inode(dentry), 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 = d_inode(dentry);
561
562 p9_debug(P9_DEBUG_VFS, "\n");
563
564 retval = setattr_prepare(dentry, 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 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
611 *
612 */
613
614 void
615 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
616 unsigned int flags)
617 {
618 umode_t mode;
619 struct v9fs_inode *v9inode = V9FS_I(inode);
620
621 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
622 inode->i_atime.tv_sec = stat->st_atime_sec;
623 inode->i_atime.tv_nsec = stat->st_atime_nsec;
624 inode->i_mtime.tv_sec = stat->st_mtime_sec;
625 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
626 inode->i_ctime.tv_sec = stat->st_ctime_sec;
627 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
628 inode->i_uid = stat->st_uid;
629 inode->i_gid = stat->st_gid;
630 set_nlink(inode, stat->st_nlink);
631
632 mode = stat->st_mode & S_IALLUGO;
633 mode |= inode->i_mode & ~S_IALLUGO;
634 inode->i_mode = mode;
635
636 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
637 v9fs_i_size_write(inode, stat->st_size);
638 inode->i_blocks = stat->st_blocks;
639 } else {
640 if (stat->st_result_mask & P9_STATS_ATIME) {
641 inode->i_atime.tv_sec = stat->st_atime_sec;
642 inode->i_atime.tv_nsec = stat->st_atime_nsec;
643 }
644 if (stat->st_result_mask & P9_STATS_MTIME) {
645 inode->i_mtime.tv_sec = stat->st_mtime_sec;
646 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
647 }
648 if (stat->st_result_mask & P9_STATS_CTIME) {
649 inode->i_ctime.tv_sec = stat->st_ctime_sec;
650 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
651 }
652 if (stat->st_result_mask & P9_STATS_UID)
653 inode->i_uid = stat->st_uid;
654 if (stat->st_result_mask & P9_STATS_GID)
655 inode->i_gid = stat->st_gid;
656 if (stat->st_result_mask & P9_STATS_NLINK)
657 set_nlink(inode, stat->st_nlink);
658 if (stat->st_result_mask & P9_STATS_MODE) {
659 inode->i_mode = stat->st_mode;
660 if ((S_ISBLK(inode->i_mode)) ||
661 (S_ISCHR(inode->i_mode)))
662 init_special_inode(inode, inode->i_mode,
663 inode->i_rdev);
664 }
665 if (stat->st_result_mask & P9_STATS_RDEV)
666 inode->i_rdev = new_decode_dev(stat->st_rdev);
667 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
668 stat->st_result_mask & P9_STATS_SIZE)
669 v9fs_i_size_write(inode, stat->st_size);
670 if (stat->st_result_mask & P9_STATS_BLOCKS)
671 inode->i_blocks = stat->st_blocks;
672 }
673 if (stat->st_result_mask & P9_STATS_GEN)
674 inode->i_generation = stat->st_gen;
675
676 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
677 * because the inode structure does not have fields for them.
678 */
679 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
680 }
681
682 static int
683 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
684 const char *symname)
685 {
686 int err;
687 kgid_t gid;
688 const unsigned char *name;
689 struct p9_qid qid;
690 struct inode *inode;
691 struct p9_fid *dfid;
692 struct p9_fid *fid = NULL;
693 struct v9fs_session_info *v9ses;
694
695 name = dentry->d_name.name;
696 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
697 v9ses = v9fs_inode2v9ses(dir);
698
699 dfid = v9fs_parent_fid(dentry);
700 if (IS_ERR(dfid)) {
701 err = PTR_ERR(dfid);
702 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
703 return err;
704 }
705
706 gid = v9fs_get_fsgid_for_create(dir);
707
708 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
709 err = p9_client_symlink(dfid, name, symname, gid, &qid);
710
711 if (err < 0) {
712 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
713 goto error;
714 }
715
716 v9fs_invalidate_inode_attr(dir);
717 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
718 /* Now walk from the parent so we can get an unopened fid. */
719 fid = p9_client_walk(dfid, 1, &name, 1);
720 if (IS_ERR(fid)) {
721 err = PTR_ERR(fid);
722 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
723 err);
724 fid = NULL;
725 goto error;
726 }
727
728 /* instantiate inode and assign the unopened fid to dentry */
729 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
730 if (IS_ERR(inode)) {
731 err = PTR_ERR(inode);
732 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
733 err);
734 goto error;
735 }
736 v9fs_fid_add(dentry, fid);
737 d_instantiate(dentry, inode);
738 fid = NULL;
739 err = 0;
740 } else {
741 /* Not in cached mode. No need to populate inode with stat */
742 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
743 if (IS_ERR(inode)) {
744 err = PTR_ERR(inode);
745 goto error;
746 }
747 d_instantiate(dentry, inode);
748 }
749
750 error:
751 if (fid)
752 p9_client_clunk(fid);
753
754 return err;
755 }
756
757 /**
758 * v9fs_vfs_link_dotl - create a hardlink for dotl
759 * @old_dentry: dentry for file to link to
760 * @dir: inode destination for new link
761 * @dentry: dentry for link
762 *
763 */
764
765 static int
766 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
767 struct dentry *dentry)
768 {
769 int err;
770 struct p9_fid *dfid, *oldfid;
771 struct v9fs_session_info *v9ses;
772
773 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
774 dir->i_ino, old_dentry, dentry);
775
776 v9ses = v9fs_inode2v9ses(dir);
777 dfid = v9fs_parent_fid(dentry);
778 if (IS_ERR(dfid))
779 return PTR_ERR(dfid);
780
781 oldfid = v9fs_fid_lookup(old_dentry);
782 if (IS_ERR(oldfid))
783 return PTR_ERR(oldfid);
784
785 err = p9_client_link(dfid, oldfid, dentry->d_name.name);
786
787 if (err < 0) {
788 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
789 return err;
790 }
791
792 v9fs_invalidate_inode_attr(dir);
793 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
794 /* Get the latest stat info from server. */
795 struct p9_fid *fid;
796 fid = v9fs_fid_lookup(old_dentry);
797 if (IS_ERR(fid))
798 return PTR_ERR(fid);
799
800 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
801 }
802 ihold(d_inode(old_dentry));
803 d_instantiate(dentry, d_inode(old_dentry));
804
805 return err;
806 }
807
808 /**
809 * v9fs_vfs_mknod_dotl - create a special file
810 * @dir: inode destination for new link
811 * @dentry: dentry for file
812 * @omode: mode for creation
813 * @rdev: device associated with special file
814 *
815 */
816 static int
817 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
818 dev_t rdev)
819 {
820 int err;
821 kgid_t gid;
822 const unsigned char *name;
823 umode_t mode;
824 struct v9fs_session_info *v9ses;
825 struct p9_fid *fid = NULL, *dfid = NULL;
826 struct inode *inode;
827 struct p9_qid qid;
828 struct posix_acl *dacl = NULL, *pacl = NULL;
829
830 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
831 dir->i_ino, dentry, omode,
832 MAJOR(rdev), MINOR(rdev));
833
834 v9ses = v9fs_inode2v9ses(dir);
835 dfid = v9fs_parent_fid(dentry);
836 if (IS_ERR(dfid)) {
837 err = PTR_ERR(dfid);
838 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
839 dfid = NULL;
840 goto error;
841 }
842
843 gid = v9fs_get_fsgid_for_create(dir);
844 mode = omode;
845 /* Update mode based on ACL value */
846 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
847 if (err) {
848 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
849 err);
850 goto error;
851 }
852 name = dentry->d_name.name;
853
854 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
855 if (err < 0)
856 goto error;
857
858 v9fs_invalidate_inode_attr(dir);
859 fid = p9_client_walk(dfid, 1, &name, 1);
860 if (IS_ERR(fid)) {
861 err = PTR_ERR(fid);
862 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
863 err);
864 fid = NULL;
865 goto error;
866 }
867
868 /* instantiate inode and assign the unopened fid to the dentry */
869 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
870 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
871 if (IS_ERR(inode)) {
872 err = PTR_ERR(inode);
873 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
874 err);
875 goto error;
876 }
877 v9fs_set_create_acl(inode, fid, dacl, pacl);
878 v9fs_fid_add(dentry, fid);
879 d_instantiate(dentry, inode);
880 fid = NULL;
881 err = 0;
882 } else {
883 /*
884 * Not in cached mode. No need to populate inode with stat.
885 * socket syscall returns a fd, so we need instantiate
886 */
887 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
888 if (IS_ERR(inode)) {
889 err = PTR_ERR(inode);
890 goto error;
891 }
892 v9fs_set_create_acl(inode, fid, dacl, pacl);
893 d_instantiate(dentry, inode);
894 }
895 error:
896 if (fid)
897 p9_client_clunk(fid);
898 v9fs_put_acl(dacl, pacl);
899 return err;
900 }
901
902 /**
903 * v9fs_vfs_get_link_dotl - follow a symlink path
904 * @dentry: dentry for symlink
905 * @inode: inode for symlink
906 * @done: destructor for return value
907 */
908
909 static const char *
910 v9fs_vfs_get_link_dotl(struct dentry *dentry,
911 struct inode *inode,
912 struct delayed_call *done)
913 {
914 struct p9_fid *fid;
915 char *target;
916 int retval;
917
918 if (!dentry)
919 return ERR_PTR(-ECHILD);
920
921 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
922
923 fid = v9fs_fid_lookup(dentry);
924 if (IS_ERR(fid))
925 return ERR_CAST(fid);
926 retval = p9_client_readlink(fid, &target);
927 if (retval)
928 return ERR_PTR(retval);
929 set_delayed_call(done, kfree_link, target);
930 return target;
931 }
932
933 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
934 {
935 struct p9_stat_dotl *st;
936 struct v9fs_session_info *v9ses;
937 unsigned int flags;
938
939 v9ses = v9fs_inode2v9ses(inode);
940 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
941 if (IS_ERR(st))
942 return PTR_ERR(st);
943 /*
944 * Don't update inode if the file type is different
945 */
946 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
947 goto out;
948
949 /*
950 * We don't want to refresh inode->i_size,
951 * because we may have cached data
952 */
953 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
954 V9FS_STAT2INODE_KEEP_ISIZE : 0;
955 v9fs_stat2inode_dotl(st, inode, flags);
956 out:
957 kfree(st);
958 return 0;
959 }
960
961 const struct inode_operations v9fs_dir_inode_operations_dotl = {
962 .create = v9fs_vfs_create_dotl,
963 .atomic_open = v9fs_vfs_atomic_open_dotl,
964 .lookup = v9fs_vfs_lookup,
965 .link = v9fs_vfs_link_dotl,
966 .symlink = v9fs_vfs_symlink_dotl,
967 .unlink = v9fs_vfs_unlink,
968 .mkdir = v9fs_vfs_mkdir_dotl,
969 .rmdir = v9fs_vfs_rmdir,
970 .mknod = v9fs_vfs_mknod_dotl,
971 .rename = v9fs_vfs_rename,
972 .getattr = v9fs_vfs_getattr_dotl,
973 .setattr = v9fs_vfs_setattr_dotl,
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 .listxattr = v9fs_listxattr,
982 .get_acl = v9fs_iop_get_acl,
983 };
984
985 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
986 .get_link = v9fs_vfs_get_link_dotl,
987 .getattr = v9fs_vfs_getattr_dotl,
988 .setattr = v9fs_vfs_setattr_dotl,
989 .listxattr = v9fs_listxattr,
990 };
Linux with added FPC-III support