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Merge remote-tracking branch 'moduleh/module.h-split'
[linux-2.6/next.git] / fs / 9p / vfs_inode_dotl.c
blobaded79fcd5cfdadc359929f3b39fad1f92ff2001
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, int 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 gid_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 /**
72 * v9fs_dentry_from_dir_inode - helper function to get the dentry from
73 * dir inode.
74 *
75 */
76
77 static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode)
78 {
79 struct dentry *dentry;
80
81 spin_lock(&inode->i_lock);
82 /* Directory should have only one entry. */
83 BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry));
84 dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias);
85 spin_unlock(&inode->i_lock);
86 return dentry;
87 }
88
89 static int v9fs_test_inode_dotl(struct inode *inode, void *data)
90 {
91 struct v9fs_inode *v9inode = V9FS_I(inode);
92 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
93
94 /* don't match inode of different type */
95 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
96 return 0;
97
98 if (inode->i_generation != st->st_gen)
99 return 0;
100
101 /* compare qid details */
102 if (memcmp(&v9inode->qid.version,
103 &st->qid.version, sizeof(v9inode->qid.version)))
104 return 0;
105
106 if (v9inode->qid.type != st->qid.type)
107 return 0;
108 return 1;
109 }
110
111 /* Always get a new inode */
112 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
113 {
114 return 0;
115 }
116
117 static int v9fs_set_inode_dotl(struct inode *inode, void *data)
118 {
119 struct v9fs_inode *v9inode = V9FS_I(inode);
120 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
121
122 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
123 inode->i_generation = st->st_gen;
124 return 0;
125 }
126
127 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
128 struct p9_qid *qid,
129 struct p9_fid *fid,
130 struct p9_stat_dotl *st,
131 int new)
132 {
133 int retval;
134 unsigned long i_ino;
135 struct inode *inode;
136 struct v9fs_session_info *v9ses = sb->s_fs_info;
137 int (*test)(struct inode *, void *);
138
139 if (new)
140 test = v9fs_test_new_inode_dotl;
141 else
142 test = v9fs_test_inode_dotl;
143
144 i_ino = v9fs_qid2ino(qid);
145 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
146 if (!inode)
147 return ERR_PTR(-ENOMEM);
148 if (!(inode->i_state & I_NEW))
149 return inode;
150 /*
151 * initialize the inode with the stat info
152 * FIXME!! we may need support for stale inodes
153 * later.
154 */
155 inode->i_ino = i_ino;
156 retval = v9fs_init_inode(v9ses, inode,
157 st->st_mode, new_decode_dev(st->st_rdev));
158 if (retval)
159 goto error;
160
161 v9fs_stat2inode_dotl(st, inode);
162 #ifdef CONFIG_9P_FSCACHE
163 v9fs_cache_inode_get_cookie(inode);
164 #endif
165 retval = v9fs_get_acl(inode, fid);
166 if (retval)
167 goto error;
168
169 unlock_new_inode(inode);
170 return inode;
171 error:
172 unlock_new_inode(inode);
173 iput(inode);
174 return ERR_PTR(retval);
175
176 }
177
178 struct inode *
179 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
180 struct super_block *sb, int new)
181 {
182 struct p9_stat_dotl *st;
183 struct inode *inode = NULL;
184
185 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
186 if (IS_ERR(st))
187 return ERR_CAST(st);
188
189 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
190 kfree(st);
191 return inode;
192 }
193
194 struct dotl_openflag_map {
195 int open_flag;
196 int dotl_flag;
197 };
198
199 static int v9fs_mapped_dotl_flags(int flags)
200 {
201 int i;
202 int rflags = 0;
203 struct dotl_openflag_map dotl_oflag_map[] = {
204 { O_CREAT, P9_DOTL_CREATE },
205 { O_EXCL, P9_DOTL_EXCL },
206 { O_NOCTTY, P9_DOTL_NOCTTY },
207 { O_TRUNC, P9_DOTL_TRUNC },
208 { O_APPEND, P9_DOTL_APPEND },
209 { O_NONBLOCK, P9_DOTL_NONBLOCK },
210 { O_DSYNC, P9_DOTL_DSYNC },
211 { FASYNC, P9_DOTL_FASYNC },
212 { O_DIRECT, P9_DOTL_DIRECT },
213 { O_LARGEFILE, P9_DOTL_LARGEFILE },
214 { O_DIRECTORY, P9_DOTL_DIRECTORY },
215 { O_NOFOLLOW, P9_DOTL_NOFOLLOW },
216 { O_NOATIME, P9_DOTL_NOATIME },
217 { O_CLOEXEC, P9_DOTL_CLOEXEC },
218 { O_SYNC, P9_DOTL_SYNC},
219 };
220 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
221 if (flags & dotl_oflag_map[i].open_flag)
222 rflags |= dotl_oflag_map[i].dotl_flag;
223 }
224 return rflags;
225 }
226
227 /**
228 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
229 * plan 9 open flag.
230 * @flags: flags to convert
231 */
232 int v9fs_open_to_dotl_flags(int flags)
233 {
234 int rflags = 0;
235
236 /*
237 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
238 * and P9_DOTL_NOACCESS
239 */
240 rflags |= flags & O_ACCMODE;
241 rflags |= v9fs_mapped_dotl_flags(flags);
242
243 return rflags;
244 }
245
246 /**
247 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
248 * @dir: directory inode that is being created
249 * @dentry: dentry that is being deleted
250 * @mode: create permissions
251 * @nd: path information
252 *
253 */
254
255 static int
256 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
257 struct nameidata *nd)
258 {
259 int err = 0;
260 gid_t gid;
261 int flags;
262 umode_t mode;
263 char *name = NULL;
264 struct file *filp;
265 struct p9_qid qid;
266 struct inode *inode;
267 struct p9_fid *fid = NULL;
268 struct v9fs_inode *v9inode;
269 struct p9_fid *dfid, *ofid, *inode_fid;
270 struct v9fs_session_info *v9ses;
271 struct posix_acl *pacl = NULL, *dacl = NULL;
272
273 v9ses = v9fs_inode2v9ses(dir);
274 if (nd)
275 flags = nd->intent.open.flags;
276 else {
277 /*
278 * create call without LOOKUP_OPEN is due
279 * to mknod of regular files. So use mknod
280 * operation.
281 */
282 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
283 }
284
285 name = (char *) dentry->d_name.name;
286 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
287 "mode:0x%x\n", name, flags, omode);
288
289 dfid = v9fs_fid_lookup(dentry->d_parent);
290 if (IS_ERR(dfid)) {
291 err = PTR_ERR(dfid);
292 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
293 return err;
294 }
295
296 /* clone a fid to use for creation */
297 ofid = p9_client_walk(dfid, 0, NULL, 1);
298 if (IS_ERR(ofid)) {
299 err = PTR_ERR(ofid);
300 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
301 return err;
302 }
303
304 gid = v9fs_get_fsgid_for_create(dir);
305
306 mode = omode;
307 /* Update mode based on ACL value */
308 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
309 if (err) {
310 P9_DPRINTK(P9_DEBUG_VFS,
311 "Failed to get acl values in creat %d\n", err);
312 goto error;
313 }
314 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
315 mode, gid, &qid);
316 if (err < 0) {
317 P9_DPRINTK(P9_DEBUG_VFS,
318 "p9_client_open_dotl failed in creat %d\n",
319 err);
320 goto error;
321 }
322 v9fs_invalidate_inode_attr(dir);
323
324 /* instantiate inode and assign the unopened fid to the dentry */
325 fid = p9_client_walk(dfid, 1, &name, 1);
326 if (IS_ERR(fid)) {
327 err = PTR_ERR(fid);
328 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
329 fid = NULL;
330 goto error;
331 }
332 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
333 if (IS_ERR(inode)) {
334 err = PTR_ERR(inode);
335 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
336 goto error;
337 }
338 err = v9fs_fid_add(dentry, fid);
339 if (err < 0)
340 goto error;
341 d_instantiate(dentry, inode);
342
343 /* Now set the ACL based on the default value */
344 v9fs_set_create_acl(dentry, &dacl, &pacl);
345
346 v9inode = V9FS_I(inode);
347 mutex_lock(&v9inode->v_mutex);
348 if (v9ses->cache && !v9inode->writeback_fid &&
349 ((flags & O_ACCMODE) != O_RDONLY)) {
350 /*
351 * clone a fid and add it to writeback_fid
352 * we do it during open time instead of
353 * page dirty time via write_begin/page_mkwrite
354 * because we want write after unlink usecase
355 * to work.
356 */
357 inode_fid = v9fs_writeback_fid(dentry);
358 if (IS_ERR(inode_fid)) {
359 err = PTR_ERR(inode_fid);
360 mutex_unlock(&v9inode->v_mutex);
361 goto err_clunk_old_fid;
362 }
363 v9inode->writeback_fid = (void *) inode_fid;
364 }
365 mutex_unlock(&v9inode->v_mutex);
366 /* Since we are opening a file, assign the open fid to the file */
367 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
368 if (IS_ERR(filp)) {
369 err = PTR_ERR(filp);
370 goto err_clunk_old_fid;
371 }
372 filp->private_data = ofid;
373 #ifdef CONFIG_9P_FSCACHE
374 if (v9ses->cache)
375 v9fs_cache_inode_set_cookie(inode, filp);
376 #endif
377 return 0;
378
379 error:
380 if (fid)
381 p9_client_clunk(fid);
382 err_clunk_old_fid:
383 if (ofid)
384 p9_client_clunk(ofid);
385 v9fs_set_create_acl(NULL, &dacl, &pacl);
386 return err;
387 }
388
389 /**
390 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
391 * @dir: inode that is being unlinked
392 * @dentry: dentry that is being unlinked
393 * @mode: mode for new directory
394 *
395 */
396
397 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
398 struct dentry *dentry, int omode)
399 {
400 int err;
401 struct v9fs_session_info *v9ses;
402 struct p9_fid *fid = NULL, *dfid = NULL;
403 gid_t gid;
404 char *name;
405 umode_t mode;
406 struct inode *inode;
407 struct p9_qid qid;
408 struct dentry *dir_dentry;
409 struct posix_acl *dacl = NULL, *pacl = NULL;
410
411 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
412 err = 0;
413 v9ses = v9fs_inode2v9ses(dir);
414
415 omode |= S_IFDIR;
416 if (dir->i_mode & S_ISGID)
417 omode |= S_ISGID;
418
419 dir_dentry = v9fs_dentry_from_dir_inode(dir);
420 dfid = v9fs_fid_lookup(dir_dentry);
421 if (IS_ERR(dfid)) {
422 err = PTR_ERR(dfid);
423 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
424 dfid = NULL;
425 goto error;
426 }
427
428 gid = v9fs_get_fsgid_for_create(dir);
429 mode = omode;
430 /* Update mode based on ACL value */
431 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
432 if (err) {
433 P9_DPRINTK(P9_DEBUG_VFS,
434 "Failed to get acl values in mkdir %d\n", err);
435 goto error;
436 }
437 name = (char *) dentry->d_name.name;
438 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
439 if (err < 0)
440 goto error;
441
442 /* instantiate inode and assign the unopened fid to the dentry */
443 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
444 fid = p9_client_walk(dfid, 1, &name, 1);
445 if (IS_ERR(fid)) {
446 err = PTR_ERR(fid);
447 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
448 err);
449 fid = NULL;
450 goto error;
451 }
452
453 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
454 if (IS_ERR(inode)) {
455 err = PTR_ERR(inode);
456 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
457 err);
458 goto error;
459 }
460 err = v9fs_fid_add(dentry, fid);
461 if (err < 0)
462 goto error;
463 d_instantiate(dentry, inode);
464 fid = NULL;
465 } else {
466 /*
467 * Not in cached mode. No need to populate
468 * inode with stat. We need to get an inode
469 * so that we can set the acl with dentry
470 */
471 inode = v9fs_get_inode(dir->i_sb, mode, 0);
472 if (IS_ERR(inode)) {
473 err = PTR_ERR(inode);
474 goto error;
475 }
476 d_instantiate(dentry, inode);
477 }
478 /* Now set the ACL based on the default value */
479 v9fs_set_create_acl(dentry, &dacl, &pacl);
480 inc_nlink(dir);
481 v9fs_invalidate_inode_attr(dir);
482 error:
483 if (fid)
484 p9_client_clunk(fid);
485 v9fs_set_create_acl(NULL, &dacl, &pacl);
486 return err;
487 }
488
489 static int
490 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
491 struct kstat *stat)
492 {
493 int err;
494 struct v9fs_session_info *v9ses;
495 struct p9_fid *fid;
496 struct p9_stat_dotl *st;
497
498 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
499 err = -EPERM;
500 v9ses = v9fs_dentry2v9ses(dentry);
501 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
502 generic_fillattr(dentry->d_inode, stat);
503 return 0;
504 }
505 fid = v9fs_fid_lookup(dentry);
506 if (IS_ERR(fid))
507 return PTR_ERR(fid);
508
509 /* Ask for all the fields in stat structure. Server will return
510 * whatever it supports
511 */
512
513 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
514 if (IS_ERR(st))
515 return PTR_ERR(st);
516
517 v9fs_stat2inode_dotl(st, dentry->d_inode);
518 generic_fillattr(dentry->d_inode, stat);
519 /* Change block size to what the server returned */
520 stat->blksize = st->st_blksize;
521
522 kfree(st);
523 return 0;
524 }
525
526 /**
527 * v9fs_vfs_setattr_dotl - set file metadata
528 * @dentry: file whose metadata to set
529 * @iattr: metadata assignment structure
530 *
531 */
532
533 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
534 {
535 int retval;
536 struct v9fs_session_info *v9ses;
537 struct p9_fid *fid;
538 struct p9_iattr_dotl p9attr;
539
540 P9_DPRINTK(P9_DEBUG_VFS, "\n");
541
542 retval = inode_change_ok(dentry->d_inode, iattr);
543 if (retval)
544 return retval;
545
546 p9attr.valid = iattr->ia_valid;
547 p9attr.mode = iattr->ia_mode;
548 p9attr.uid = iattr->ia_uid;
549 p9attr.gid = iattr->ia_gid;
550 p9attr.size = iattr->ia_size;
551 p9attr.atime_sec = iattr->ia_atime.tv_sec;
552 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
553 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
554 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
555
556 retval = -EPERM;
557 v9ses = v9fs_dentry2v9ses(dentry);
558 fid = v9fs_fid_lookup(dentry);
559 if (IS_ERR(fid))
560 return PTR_ERR(fid);
561
562 /* Write all dirty data */
563 if (S_ISREG(dentry->d_inode->i_mode))
564 filemap_write_and_wait(dentry->d_inode->i_mapping);
565
566 retval = p9_client_setattr(fid, &p9attr);
567 if (retval < 0)
568 return retval;
569
570 if ((iattr->ia_valid & ATTR_SIZE) &&
571 iattr->ia_size != i_size_read(dentry->d_inode))
572 truncate_setsize(dentry->d_inode, iattr->ia_size);
573
574 v9fs_invalidate_inode_attr(dentry->d_inode);
575 setattr_copy(dentry->d_inode, iattr);
576 mark_inode_dirty(dentry->d_inode);
577 if (iattr->ia_valid & ATTR_MODE) {
578 /* We also want to update ACL when we update mode bits */
579 retval = v9fs_acl_chmod(dentry);
580 if (retval < 0)
581 return retval;
582 }
583 return 0;
584 }
585
586 /**
587 * v9fs_stat2inode_dotl - populate an inode structure with stat info
588 * @stat: stat structure
589 * @inode: inode to populate
590 * @sb: superblock of filesystem
591 *
592 */
593
594 void
595 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
596 {
597 mode_t mode;
598 struct v9fs_inode *v9inode = V9FS_I(inode);
599
600 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
601 inode->i_atime.tv_sec = stat->st_atime_sec;
602 inode->i_atime.tv_nsec = stat->st_atime_nsec;
603 inode->i_mtime.tv_sec = stat->st_mtime_sec;
604 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
605 inode->i_ctime.tv_sec = stat->st_ctime_sec;
606 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
607 inode->i_uid = stat->st_uid;
608 inode->i_gid = stat->st_gid;
609 inode->i_nlink = stat->st_nlink;
610
611 mode = stat->st_mode & S_IALLUGO;
612 mode |= inode->i_mode & ~S_IALLUGO;
613 inode->i_mode = mode;
614
615 i_size_write(inode, stat->st_size);
616 inode->i_blocks = stat->st_blocks;
617 } else {
618 if (stat->st_result_mask & P9_STATS_ATIME) {
619 inode->i_atime.tv_sec = stat->st_atime_sec;
620 inode->i_atime.tv_nsec = stat->st_atime_nsec;
621 }
622 if (stat->st_result_mask & P9_STATS_MTIME) {
623 inode->i_mtime.tv_sec = stat->st_mtime_sec;
624 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
625 }
626 if (stat->st_result_mask & P9_STATS_CTIME) {
627 inode->i_ctime.tv_sec = stat->st_ctime_sec;
628 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
629 }
630 if (stat->st_result_mask & P9_STATS_UID)
631 inode->i_uid = stat->st_uid;
632 if (stat->st_result_mask & P9_STATS_GID)
633 inode->i_gid = stat->st_gid;
634 if (stat->st_result_mask & P9_STATS_NLINK)
635 inode->i_nlink = stat->st_nlink;
636 if (stat->st_result_mask & P9_STATS_MODE) {
637 inode->i_mode = stat->st_mode;
638 if ((S_ISBLK(inode->i_mode)) ||
639 (S_ISCHR(inode->i_mode)))
640 init_special_inode(inode, inode->i_mode,
641 inode->i_rdev);
642 }
643 if (stat->st_result_mask & P9_STATS_RDEV)
644 inode->i_rdev = new_decode_dev(stat->st_rdev);
645 if (stat->st_result_mask & P9_STATS_SIZE)
646 i_size_write(inode, stat->st_size);
647 if (stat->st_result_mask & P9_STATS_BLOCKS)
648 inode->i_blocks = stat->st_blocks;
649 }
650 if (stat->st_result_mask & P9_STATS_GEN)
651 inode->i_generation = stat->st_gen;
652
653 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
654 * because the inode structure does not have fields for them.
655 */
656 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
657 }
658
659 static int
660 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
661 const char *symname)
662 {
663 int err;
664 gid_t gid;
665 char *name;
666 struct p9_qid qid;
667 struct inode *inode;
668 struct p9_fid *dfid;
669 struct p9_fid *fid = NULL;
670 struct v9fs_session_info *v9ses;
671
672 name = (char *) dentry->d_name.name;
673 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
674 dir->i_ino, name, symname);
675 v9ses = v9fs_inode2v9ses(dir);
676
677 dfid = v9fs_fid_lookup(dentry->d_parent);
678 if (IS_ERR(dfid)) {
679 err = PTR_ERR(dfid);
680 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
681 return err;
682 }
683
684 gid = v9fs_get_fsgid_for_create(dir);
685
686 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
687 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
688
689 if (err < 0) {
690 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
691 goto error;
692 }
693
694 v9fs_invalidate_inode_attr(dir);
695 if (v9ses->cache) {
696 /* Now walk from the parent so we can get an unopened fid. */
697 fid = p9_client_walk(dfid, 1, &name, 1);
698 if (IS_ERR(fid)) {
699 err = PTR_ERR(fid);
700 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
701 err);
702 fid = NULL;
703 goto error;
704 }
705
706 /* instantiate inode and assign the unopened fid to dentry */
707 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
708 if (IS_ERR(inode)) {
709 err = PTR_ERR(inode);
710 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
711 err);
712 goto error;
713 }
714 err = v9fs_fid_add(dentry, fid);
715 if (err < 0)
716 goto error;
717 d_instantiate(dentry, inode);
718 fid = NULL;
719 } else {
720 /* Not in cached mode. No need to populate inode with stat */
721 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
722 if (IS_ERR(inode)) {
723 err = PTR_ERR(inode);
724 goto error;
725 }
726 d_instantiate(dentry, inode);
727 }
728
729 error:
730 if (fid)
731 p9_client_clunk(fid);
732
733 return err;
734 }
735
736 /**
737 * v9fs_vfs_link_dotl - create a hardlink for dotl
738 * @old_dentry: dentry for file to link to
739 * @dir: inode destination for new link
740 * @dentry: dentry for link
741 *
742 */
743
744 static int
745 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
746 struct dentry *dentry)
747 {
748 int err;
749 char *name;
750 struct dentry *dir_dentry;
751 struct p9_fid *dfid, *oldfid;
752 struct v9fs_session_info *v9ses;
753
754 P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
755 dir->i_ino, old_dentry->d_name.name,
756 dentry->d_name.name);
757
758 v9ses = v9fs_inode2v9ses(dir);
759 dir_dentry = v9fs_dentry_from_dir_inode(dir);
760 dfid = v9fs_fid_lookup(dir_dentry);
761 if (IS_ERR(dfid))
762 return PTR_ERR(dfid);
763
764 oldfid = v9fs_fid_lookup(old_dentry);
765 if (IS_ERR(oldfid))
766 return PTR_ERR(oldfid);
767
768 name = (char *) dentry->d_name.name;
769
770 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
771
772 if (err < 0) {
773 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
774 return err;
775 }
776
777 v9fs_invalidate_inode_attr(dir);
778 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
779 /* Get the latest stat info from server. */
780 struct p9_fid *fid;
781 fid = v9fs_fid_lookup(old_dentry);
782 if (IS_ERR(fid))
783 return PTR_ERR(fid);
784
785 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
786 }
787 ihold(old_dentry->d_inode);
788 d_instantiate(dentry, old_dentry->d_inode);
789
790 return err;
791 }
792
793 /**
794 * v9fs_vfs_mknod_dotl - create a special file
795 * @dir: inode destination for new link
796 * @dentry: dentry for file
797 * @mode: mode for creation
798 * @rdev: device associated with special file
799 *
800 */
801 static int
802 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
803 dev_t rdev)
804 {
805 int err;
806 gid_t gid;
807 char *name;
808 umode_t mode;
809 struct v9fs_session_info *v9ses;
810 struct p9_fid *fid = NULL, *dfid = NULL;
811 struct inode *inode;
812 struct p9_qid qid;
813 struct dentry *dir_dentry;
814 struct posix_acl *dacl = NULL, *pacl = NULL;
815
816 P9_DPRINTK(P9_DEBUG_VFS,
817 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
818 dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
819
820 if (!new_valid_dev(rdev))
821 return -EINVAL;
822
823 v9ses = v9fs_inode2v9ses(dir);
824 dir_dentry = v9fs_dentry_from_dir_inode(dir);
825 dfid = v9fs_fid_lookup(dir_dentry);
826 if (IS_ERR(dfid)) {
827 err = PTR_ERR(dfid);
828 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
829 dfid = NULL;
830 goto error;
831 }
832
833 gid = v9fs_get_fsgid_for_create(dir);
834 mode = omode;
835 /* Update mode based on ACL value */
836 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
837 if (err) {
838 P9_DPRINTK(P9_DEBUG_VFS,
839 "Failed to get acl values in mknod %d\n", err);
840 goto error;
841 }
842 name = (char *) dentry->d_name.name;
843
844 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
845 if (err < 0)
846 goto error;
847
848 v9fs_invalidate_inode_attr(dir);
849 /* instantiate inode and assign the unopened fid to the dentry */
850 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
851 fid = p9_client_walk(dfid, 1, &name, 1);
852 if (IS_ERR(fid)) {
853 err = PTR_ERR(fid);
854 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
855 err);
856 fid = NULL;
857 goto error;
858 }
859
860 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
861 if (IS_ERR(inode)) {
862 err = PTR_ERR(inode);
863 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
864 err);
865 goto error;
866 }
867 err = v9fs_fid_add(dentry, fid);
868 if (err < 0)
869 goto error;
870 d_instantiate(dentry, inode);
871 fid = NULL;
872 } else {
873 /*
874 * Not in cached mode. No need to populate inode with stat.
875 * socket syscall returns a fd, so we need instantiate
876 */
877 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
878 if (IS_ERR(inode)) {
879 err = PTR_ERR(inode);
880 goto error;
881 }
882 d_instantiate(dentry, inode);
883 }
884 /* Now set the ACL based on the default value */
885 v9fs_set_create_acl(dentry, &dacl, &pacl);
886 error:
887 if (fid)
888 p9_client_clunk(fid);
889 v9fs_set_create_acl(NULL, &dacl, &pacl);
890 return err;
891 }
892
893 /**
894 * v9fs_vfs_follow_link_dotl - follow a symlink path
895 * @dentry: dentry for symlink
896 * @nd: nameidata
897 *
898 */
899
900 static void *
901 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
902 {
903 int retval;
904 struct p9_fid *fid;
905 char *link = __getname();
906 char *target;
907
908 P9_DPRINTK(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
909
910 if (!link) {
911 link = ERR_PTR(-ENOMEM);
912 goto ndset;
913 }
914 fid = v9fs_fid_lookup(dentry);
915 if (IS_ERR(fid)) {
916 __putname(link);
917 link = ERR_CAST(fid);
918 goto ndset;
919 }
920 retval = p9_client_readlink(fid, &target);
921 if (!retval) {
922 strcpy(link, target);
923 kfree(target);
924 goto ndset;
925 }
926 __putname(link);
927 link = ERR_PTR(retval);
928 ndset:
929 nd_set_link(nd, link);
930 return NULL;
931 }
932
933 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
934 {
935 loff_t i_size;
936 struct p9_stat_dotl *st;
937 struct v9fs_session_info *v9ses;
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 spin_lock(&inode->i_lock);
950 /*
951 * We don't want to refresh inode->i_size,
952 * because we may have cached data
953 */
954 i_size = inode->i_size;
955 v9fs_stat2inode_dotl(st, inode);
956 if (v9ses->cache)
957 inode->i_size = i_size;
958 spin_unlock(&inode->i_lock);
959 out:
960 kfree(st);
961 return 0;
962 }
963
964 const struct inode_operations v9fs_dir_inode_operations_dotl = {
965 .create = v9fs_vfs_create_dotl,
966 .lookup = v9fs_vfs_lookup,
967 .link = v9fs_vfs_link_dotl,
968 .symlink = v9fs_vfs_symlink_dotl,
969 .unlink = v9fs_vfs_unlink,
970 .mkdir = v9fs_vfs_mkdir_dotl,
971 .rmdir = v9fs_vfs_rmdir,
972 .mknod = v9fs_vfs_mknod_dotl,
973 .rename = v9fs_vfs_rename,
974 .getattr = v9fs_vfs_getattr_dotl,
975 .setattr = v9fs_vfs_setattr_dotl,
976 .setxattr = generic_setxattr,
977 .getxattr = generic_getxattr,
978 .removexattr = generic_removexattr,
979 .listxattr = v9fs_listxattr,
980 .get_acl = v9fs_iop_get_acl,
981 };
982
983 const struct inode_operations v9fs_file_inode_operations_dotl = {
984 .getattr = v9fs_vfs_getattr_dotl,
985 .setattr = v9fs_vfs_setattr_dotl,
986 .setxattr = generic_setxattr,
987 .getxattr = generic_getxattr,
988 .removexattr = generic_removexattr,
989 .listxattr = v9fs_listxattr,
990 .get_acl = v9fs_iop_get_acl,
991 };
992
993 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
994 .readlink = generic_readlink,
995 .follow_link = v9fs_vfs_follow_link_dotl,
996 .put_link = v9fs_vfs_put_link,
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 };
linux-next