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HWPOISON, hugetlb: soft offlining for hugepage
[linux/fpc-iii.git] / fs / 9p / vfs_inode.c
blob9e670d527646fc4abe2be6f0dfc992f4a3178042
1 /*
2 * linux/fs/9p/vfs_inode.c
3 *
4 * This file contains vfs inode ops for the 9P2000 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 <net/9p/9p.h>
40 #include <net/9p/client.h>
41
42 #include "v9fs.h"
43 #include "v9fs_vfs.h"
44 #include "fid.h"
45 #include "cache.h"
46 #include "xattr.h"
47
48 static const struct inode_operations v9fs_dir_inode_operations;
49 static const struct inode_operations v9fs_dir_inode_operations_dotu;
50 static const struct inode_operations v9fs_dir_inode_operations_dotl;
51 static const struct inode_operations v9fs_file_inode_operations;
52 static const struct inode_operations v9fs_file_inode_operations_dotl;
53 static const struct inode_operations v9fs_symlink_inode_operations;
54 static const struct inode_operations v9fs_symlink_inode_operations_dotl;
55
56 /**
57 * unixmode2p9mode - convert unix mode bits to plan 9
58 * @v9ses: v9fs session information
59 * @mode: mode to convert
60 *
61 */
62
63 static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
64 {
65 int res;
66 res = mode & 0777;
67 if (S_ISDIR(mode))
68 res |= P9_DMDIR;
69 if (v9fs_proto_dotu(v9ses)) {
70 if (S_ISLNK(mode))
71 res |= P9_DMSYMLINK;
72 if (v9ses->nodev == 0) {
73 if (S_ISSOCK(mode))
74 res |= P9_DMSOCKET;
75 if (S_ISFIFO(mode))
76 res |= P9_DMNAMEDPIPE;
77 if (S_ISBLK(mode))
78 res |= P9_DMDEVICE;
79 if (S_ISCHR(mode))
80 res |= P9_DMDEVICE;
81 }
82
83 if ((mode & S_ISUID) == S_ISUID)
84 res |= P9_DMSETUID;
85 if ((mode & S_ISGID) == S_ISGID)
86 res |= P9_DMSETGID;
87 if ((mode & S_ISVTX) == S_ISVTX)
88 res |= P9_DMSETVTX;
89 if ((mode & P9_DMLINK))
90 res |= P9_DMLINK;
91 }
92
93 return res;
94 }
95
96 /**
97 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
98 * @v9ses: v9fs session information
99 * @mode: mode to convert
100 *
101 */
102
103 static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
104 {
105 int res;
106
107 res = mode & 0777;
108
109 if ((mode & P9_DMDIR) == P9_DMDIR)
110 res |= S_IFDIR;
111 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
112 res |= S_IFLNK;
113 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
114 && (v9ses->nodev == 0))
115 res |= S_IFSOCK;
116 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
117 && (v9ses->nodev == 0))
118 res |= S_IFIFO;
119 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
120 && (v9ses->nodev == 0))
121 res |= S_IFBLK;
122 else
123 res |= S_IFREG;
124
125 if (v9fs_proto_dotu(v9ses)) {
126 if ((mode & P9_DMSETUID) == P9_DMSETUID)
127 res |= S_ISUID;
128
129 if ((mode & P9_DMSETGID) == P9_DMSETGID)
130 res |= S_ISGID;
131
132 if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
133 res |= S_ISVTX;
134 }
135
136 return res;
137 }
138
139 /**
140 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
141 * @uflags: flags to convert
142 * @extended: if .u extensions are active
143 */
144
145 int v9fs_uflags2omode(int uflags, int extended)
146 {
147 int ret;
148
149 ret = 0;
150 switch (uflags&3) {
151 default:
152 case O_RDONLY:
153 ret = P9_OREAD;
154 break;
155
156 case O_WRONLY:
157 ret = P9_OWRITE;
158 break;
159
160 case O_RDWR:
161 ret = P9_ORDWR;
162 break;
163 }
164
165 if (uflags & O_TRUNC)
166 ret |= P9_OTRUNC;
167
168 if (extended) {
169 if (uflags & O_EXCL)
170 ret |= P9_OEXCL;
171
172 if (uflags & O_APPEND)
173 ret |= P9_OAPPEND;
174 }
175
176 return ret;
177 }
178
179 /**
180 * v9fs_blank_wstat - helper function to setup a 9P stat structure
181 * @wstat: structure to initialize
182 *
183 */
184
185 void
186 v9fs_blank_wstat(struct p9_wstat *wstat)
187 {
188 wstat->type = ~0;
189 wstat->dev = ~0;
190 wstat->qid.type = ~0;
191 wstat->qid.version = ~0;
192 *((long long *)&wstat->qid.path) = ~0;
193 wstat->mode = ~0;
194 wstat->atime = ~0;
195 wstat->mtime = ~0;
196 wstat->length = ~0;
197 wstat->name = NULL;
198 wstat->uid = NULL;
199 wstat->gid = NULL;
200 wstat->muid = NULL;
201 wstat->n_uid = ~0;
202 wstat->n_gid = ~0;
203 wstat->n_muid = ~0;
204 wstat->extension = NULL;
205 }
206
207 #ifdef CONFIG_9P_FSCACHE
208 /**
209 * v9fs_alloc_inode - helper function to allocate an inode
210 * This callback is executed before setting up the inode so that we
211 * can associate a vcookie with each inode.
212 *
213 */
214
215 struct inode *v9fs_alloc_inode(struct super_block *sb)
216 {
217 struct v9fs_cookie *vcookie;
218 vcookie = (struct v9fs_cookie *)kmem_cache_alloc(vcookie_cache,
219 GFP_KERNEL);
220 if (!vcookie)
221 return NULL;
222
223 vcookie->fscache = NULL;
224 vcookie->qid = NULL;
225 spin_lock_init(&vcookie->lock);
226 return &vcookie->inode;
227 }
228
229 /**
230 * v9fs_destroy_inode - destroy an inode
231 *
232 */
233
234 void v9fs_destroy_inode(struct inode *inode)
235 {
236 kmem_cache_free(vcookie_cache, v9fs_inode2cookie(inode));
237 }
238 #endif
239
240 /**
241 * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
242 * new file system object. This checks the S_ISGID to determine the owning
243 * group of the new file system object.
244 */
245
246 static gid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
247 {
248 BUG_ON(dir_inode == NULL);
249
250 if (dir_inode->i_mode & S_ISGID) {
251 /* set_gid bit is set.*/
252 return dir_inode->i_gid;
253 }
254 return current_fsgid();
255 }
256
257 /**
258 * v9fs_dentry_from_dir_inode - helper function to get the dentry from
259 * dir inode.
260 *
261 */
262
263 static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode)
264 {
265 struct dentry *dentry;
266
267 spin_lock(&dcache_lock);
268 /* Directory should have only one entry. */
269 BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry));
270 dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias);
271 spin_unlock(&dcache_lock);
272 return dentry;
273 }
274
275 /**
276 * v9fs_get_inode - helper function to setup an inode
277 * @sb: superblock
278 * @mode: mode to setup inode with
279 *
280 */
281
282 struct inode *v9fs_get_inode(struct super_block *sb, int mode)
283 {
284 int err;
285 struct inode *inode;
286 struct v9fs_session_info *v9ses = sb->s_fs_info;
287
288 P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
289
290 inode = new_inode(sb);
291 if (!inode) {
292 P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n");
293 return ERR_PTR(-ENOMEM);
294 }
295
296 inode_init_owner(inode, NULL, mode);
297 inode->i_blocks = 0;
298 inode->i_rdev = 0;
299 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
300 inode->i_mapping->a_ops = &v9fs_addr_operations;
301
302 switch (mode & S_IFMT) {
303 case S_IFIFO:
304 case S_IFBLK:
305 case S_IFCHR:
306 case S_IFSOCK:
307 if (v9fs_proto_dotl(v9ses)) {
308 inode->i_op = &v9fs_file_inode_operations_dotl;
309 inode->i_fop = &v9fs_file_operations_dotl;
310 } else if (v9fs_proto_dotu(v9ses)) {
311 inode->i_op = &v9fs_file_inode_operations;
312 inode->i_fop = &v9fs_file_operations;
313 } else {
314 P9_DPRINTK(P9_DEBUG_ERROR,
315 "special files without extended mode\n");
316 err = -EINVAL;
317 goto error;
318 }
319 init_special_inode(inode, inode->i_mode, inode->i_rdev);
320 break;
321 case S_IFREG:
322 if (v9fs_proto_dotl(v9ses)) {
323 inode->i_op = &v9fs_file_inode_operations_dotl;
324 inode->i_fop = &v9fs_file_operations_dotl;
325 } else {
326 inode->i_op = &v9fs_file_inode_operations;
327 inode->i_fop = &v9fs_file_operations;
328 }
329
330 break;
331
332 case S_IFLNK:
333 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
334 P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with "
335 "legacy protocol.\n");
336 err = -EINVAL;
337 goto error;
338 }
339
340 if (v9fs_proto_dotl(v9ses))
341 inode->i_op = &v9fs_symlink_inode_operations_dotl;
342 else
343 inode->i_op = &v9fs_symlink_inode_operations;
344
345 break;
346 case S_IFDIR:
347 inc_nlink(inode);
348 if (v9fs_proto_dotl(v9ses))
349 inode->i_op = &v9fs_dir_inode_operations_dotl;
350 else if (v9fs_proto_dotu(v9ses))
351 inode->i_op = &v9fs_dir_inode_operations_dotu;
352 else
353 inode->i_op = &v9fs_dir_inode_operations;
354
355 if (v9fs_proto_dotl(v9ses))
356 inode->i_fop = &v9fs_dir_operations_dotl;
357 else
358 inode->i_fop = &v9fs_dir_operations;
359
360 break;
361 default:
362 P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
363 mode, mode & S_IFMT);
364 err = -EINVAL;
365 goto error;
366 }
367
368 return inode;
369
370 error:
371 iput(inode);
372 return ERR_PTR(err);
373 }
374
375 /*
376 static struct v9fs_fid*
377 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
378 {
379 int err;
380 int nfid;
381 struct v9fs_fid *ret;
382 struct v9fs_fcall *fcall;
383
384 nfid = v9fs_get_idpool(&v9ses->fidpool);
385 if (nfid < 0) {
386 eprintk(KERN_WARNING, "no free fids available\n");
387 return ERR_PTR(-ENOSPC);
388 }
389
390 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
391 &fcall);
392
393 if (err < 0) {
394 if (fcall && fcall->id == RWALK)
395 goto clunk_fid;
396
397 PRINT_FCALL_ERROR("walk error", fcall);
398 v9fs_put_idpool(nfid, &v9ses->fidpool);
399 goto error;
400 }
401
402 kfree(fcall);
403 fcall = NULL;
404 ret = v9fs_fid_create(v9ses, nfid);
405 if (!ret) {
406 err = -ENOMEM;
407 goto clunk_fid;
408 }
409
410 err = v9fs_fid_insert(ret, dentry);
411 if (err < 0) {
412 v9fs_fid_destroy(ret);
413 goto clunk_fid;
414 }
415
416 return ret;
417
418 clunk_fid:
419 v9fs_t_clunk(v9ses, nfid);
420
421 error:
422 kfree(fcall);
423 return ERR_PTR(err);
424 }
425 */
426
427
428 /**
429 * v9fs_clear_inode - release an inode
430 * @inode: inode to release
431 *
432 */
433 void v9fs_evict_inode(struct inode *inode)
434 {
435 truncate_inode_pages(inode->i_mapping, 0);
436 end_writeback(inode);
437 filemap_fdatawrite(inode->i_mapping);
438
439 #ifdef CONFIG_9P_FSCACHE
440 v9fs_cache_inode_put_cookie(inode);
441 #endif
442 }
443
444 static struct inode *
445 v9fs_inode(struct v9fs_session_info *v9ses, struct p9_fid *fid,
446 struct super_block *sb)
447 {
448 int err, umode;
449 struct inode *ret = NULL;
450 struct p9_wstat *st;
451
452 st = p9_client_stat(fid);
453 if (IS_ERR(st))
454 return ERR_CAST(st);
455
456 umode = p9mode2unixmode(v9ses, st->mode);
457 ret = v9fs_get_inode(sb, umode);
458 if (IS_ERR(ret)) {
459 err = PTR_ERR(ret);
460 goto error;
461 }
462
463 v9fs_stat2inode(st, ret, sb);
464 ret->i_ino = v9fs_qid2ino(&st->qid);
465
466 #ifdef CONFIG_9P_FSCACHE
467 v9fs_vcookie_set_qid(ret, &st->qid);
468 v9fs_cache_inode_get_cookie(ret);
469 #endif
470 p9stat_free(st);
471 kfree(st);
472 return ret;
473 error:
474 p9stat_free(st);
475 kfree(st);
476 return ERR_PTR(err);
477 }
478
479 static struct inode *
480 v9fs_inode_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
481 struct super_block *sb)
482 {
483 struct inode *ret = NULL;
484 int err;
485 struct p9_stat_dotl *st;
486
487 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
488 if (IS_ERR(st))
489 return ERR_CAST(st);
490
491 ret = v9fs_get_inode(sb, st->st_mode);
492 if (IS_ERR(ret)) {
493 err = PTR_ERR(ret);
494 goto error;
495 }
496
497 v9fs_stat2inode_dotl(st, ret);
498 ret->i_ino = v9fs_qid2ino(&st->qid);
499 #ifdef CONFIG_9P_FSCACHE
500 v9fs_vcookie_set_qid(ret, &st->qid);
501 v9fs_cache_inode_get_cookie(ret);
502 #endif
503 kfree(st);
504 return ret;
505 error:
506 kfree(st);
507 return ERR_PTR(err);
508 }
509
510 /**
511 * v9fs_inode_from_fid - Helper routine to populate an inode by
512 * issuing a attribute request
513 * @v9ses: session information
514 * @fid: fid to issue attribute request for
515 * @sb: superblock on which to create inode
516 *
517 */
518 static inline struct inode *
519 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
520 struct super_block *sb)
521 {
522 if (v9fs_proto_dotl(v9ses))
523 return v9fs_inode_dotl(v9ses, fid, sb);
524 else
525 return v9fs_inode(v9ses, fid, sb);
526 }
527
528 /**
529 * v9fs_remove - helper function to remove files and directories
530 * @dir: directory inode that is being deleted
531 * @file: dentry that is being deleted
532 * @rmdir: removing a directory
533 *
534 */
535
536 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
537 {
538 int retval;
539 struct inode *file_inode;
540 struct p9_fid *v9fid;
541
542 P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
543 rmdir);
544
545 file_inode = file->d_inode;
546 v9fid = v9fs_fid_clone(file);
547 if (IS_ERR(v9fid))
548 return PTR_ERR(v9fid);
549
550 retval = p9_client_remove(v9fid);
551 if (!retval)
552 drop_nlink(file_inode);
553 return retval;
554 }
555
556 static int
557 v9fs_open_created(struct inode *inode, struct file *file)
558 {
559 return 0;
560 }
561
562
563 /**
564 * v9fs_create - Create a file
565 * @v9ses: session information
566 * @dir: directory that dentry is being created in
567 * @dentry: dentry that is being created
568 * @extension: 9p2000.u extension string to support devices, etc.
569 * @perm: create permissions
570 * @mode: open mode
571 *
572 */
573 static struct p9_fid *
574 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
575 struct dentry *dentry, char *extension, u32 perm, u8 mode)
576 {
577 int err;
578 char *name;
579 struct p9_fid *dfid, *ofid, *fid;
580 struct inode *inode;
581
582 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
583
584 err = 0;
585 ofid = NULL;
586 fid = NULL;
587 name = (char *) dentry->d_name.name;
588 dfid = v9fs_fid_lookup(dentry->d_parent);
589 if (IS_ERR(dfid)) {
590 err = PTR_ERR(dfid);
591 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
592 return ERR_PTR(err);
593 }
594
595 /* clone a fid to use for creation */
596 ofid = p9_client_walk(dfid, 0, NULL, 1);
597 if (IS_ERR(ofid)) {
598 err = PTR_ERR(ofid);
599 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
600 return ERR_PTR(err);
601 }
602
603 err = p9_client_fcreate(ofid, name, perm, mode, extension);
604 if (err < 0) {
605 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
606 goto error;
607 }
608
609 /* now walk from the parent so we can get unopened fid */
610 fid = p9_client_walk(dfid, 1, &name, 1);
611 if (IS_ERR(fid)) {
612 err = PTR_ERR(fid);
613 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
614 fid = NULL;
615 goto error;
616 }
617
618 /* instantiate inode and assign the unopened fid to the dentry */
619 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
620 if (IS_ERR(inode)) {
621 err = PTR_ERR(inode);
622 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
623 goto error;
624 }
625
626 if (v9ses->cache)
627 dentry->d_op = &v9fs_cached_dentry_operations;
628 else
629 dentry->d_op = &v9fs_dentry_operations;
630
631 d_instantiate(dentry, inode);
632 err = v9fs_fid_add(dentry, fid);
633 if (err < 0)
634 goto error;
635
636 return ofid;
637
638 error:
639 if (ofid)
640 p9_client_clunk(ofid);
641
642 if (fid)
643 p9_client_clunk(fid);
644
645 return ERR_PTR(err);
646 }
647
648 /**
649 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
650 * @dir: directory inode that is being created
651 * @dentry: dentry that is being deleted
652 * @mode: create permissions
653 * @nd: path information
654 *
655 */
656
657 static int
658 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int mode,
659 struct nameidata *nd)
660 {
661 int err = 0;
662 char *name = NULL;
663 gid_t gid;
664 int flags;
665 struct v9fs_session_info *v9ses;
666 struct p9_fid *fid = NULL;
667 struct p9_fid *dfid, *ofid;
668 struct file *filp;
669 struct p9_qid qid;
670 struct inode *inode;
671
672 v9ses = v9fs_inode2v9ses(dir);
673 if (nd && nd->flags & LOOKUP_OPEN)
674 flags = nd->intent.open.flags - 1;
675 else
676 flags = O_RDWR;
677
678 name = (char *) dentry->d_name.name;
679 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
680 "mode:0x%x\n", name, flags, mode);
681
682 dfid = v9fs_fid_lookup(dentry->d_parent);
683 if (IS_ERR(dfid)) {
684 err = PTR_ERR(dfid);
685 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
686 return err;
687 }
688
689 /* clone a fid to use for creation */
690 ofid = p9_client_walk(dfid, 0, NULL, 1);
691 if (IS_ERR(ofid)) {
692 err = PTR_ERR(ofid);
693 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
694 return err;
695 }
696
697 gid = v9fs_get_fsgid_for_create(dir);
698 err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid);
699 if (err < 0) {
700 P9_DPRINTK(P9_DEBUG_VFS,
701 "p9_client_open_dotl failed in creat %d\n",
702 err);
703 goto error;
704 }
705
706 /* No need to populate the inode if we are not opening the file AND
707 * not in cached mode.
708 */
709 if (!v9ses->cache && !(nd && nd->flags & LOOKUP_OPEN)) {
710 /* Not in cached mode. No need to populate inode with stat */
711 dentry->d_op = &v9fs_dentry_operations;
712 p9_client_clunk(ofid);
713 d_instantiate(dentry, NULL);
714 return 0;
715 }
716
717 /* Now walk from the parent so we can get an unopened fid. */
718 fid = p9_client_walk(dfid, 1, &name, 1);
719 if (IS_ERR(fid)) {
720 err = PTR_ERR(fid);
721 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
722 fid = NULL;
723 goto error;
724 }
725
726 /* instantiate inode and assign the unopened fid to dentry */
727 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
728 if (IS_ERR(inode)) {
729 err = PTR_ERR(inode);
730 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
731 goto error;
732 }
733 if (v9ses->cache)
734 dentry->d_op = &v9fs_cached_dentry_operations;
735 else
736 dentry->d_op = &v9fs_dentry_operations;
737 d_instantiate(dentry, inode);
738 err = v9fs_fid_add(dentry, fid);
739 if (err < 0)
740 goto error;
741
742 /* if we are opening a file, assign the open fid to the file */
743 if (nd && nd->flags & LOOKUP_OPEN) {
744 filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created);
745 if (IS_ERR(filp)) {
746 p9_client_clunk(ofid);
747 return PTR_ERR(filp);
748 }
749 filp->private_data = ofid;
750 } else
751 p9_client_clunk(ofid);
752
753 return 0;
754
755 error:
756 if (ofid)
757 p9_client_clunk(ofid);
758 if (fid)
759 p9_client_clunk(fid);
760 return err;
761 }
762
763 /**
764 * v9fs_vfs_create - VFS hook to create files
765 * @dir: directory inode that is being created
766 * @dentry: dentry that is being deleted
767 * @mode: create permissions
768 * @nd: path information
769 *
770 */
771
772 static int
773 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
774 struct nameidata *nd)
775 {
776 int err;
777 u32 perm;
778 int flags;
779 struct v9fs_session_info *v9ses;
780 struct p9_fid *fid;
781 struct file *filp;
782
783 err = 0;
784 fid = NULL;
785 v9ses = v9fs_inode2v9ses(dir);
786 perm = unixmode2p9mode(v9ses, mode);
787 if (nd && nd->flags & LOOKUP_OPEN)
788 flags = nd->intent.open.flags - 1;
789 else
790 flags = O_RDWR;
791
792 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
793 v9fs_uflags2omode(flags,
794 v9fs_proto_dotu(v9ses)));
795 if (IS_ERR(fid)) {
796 err = PTR_ERR(fid);
797 fid = NULL;
798 goto error;
799 }
800
801 /* if we are opening a file, assign the open fid to the file */
802 if (nd && nd->flags & LOOKUP_OPEN) {
803 filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created);
804 if (IS_ERR(filp)) {
805 err = PTR_ERR(filp);
806 goto error;
807 }
808
809 filp->private_data = fid;
810 } else
811 p9_client_clunk(fid);
812
813 return 0;
814
815 error:
816 if (fid)
817 p9_client_clunk(fid);
818
819 return err;
820 }
821
822 /**
823 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
824 * @dir: inode that is being unlinked
825 * @dentry: dentry that is being unlinked
826 * @mode: mode for new directory
827 *
828 */
829
830 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
831 {
832 int err;
833 u32 perm;
834 struct v9fs_session_info *v9ses;
835 struct p9_fid *fid;
836
837 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
838 err = 0;
839 v9ses = v9fs_inode2v9ses(dir);
840 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
841 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
842 if (IS_ERR(fid)) {
843 err = PTR_ERR(fid);
844 fid = NULL;
845 }
846
847 if (fid)
848 p9_client_clunk(fid);
849
850 return err;
851 }
852
853
854 /**
855 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
856 * @dir: inode that is being unlinked
857 * @dentry: dentry that is being unlinked
858 * @mode: mode for new directory
859 *
860 */
861
862 static int v9fs_vfs_mkdir_dotl(struct inode *dir, struct dentry *dentry,
863 int mode)
864 {
865 int err;
866 struct v9fs_session_info *v9ses;
867 struct p9_fid *fid = NULL, *dfid = NULL;
868 gid_t gid;
869 char *name;
870 struct inode *inode;
871 struct p9_qid qid;
872 struct dentry *dir_dentry;
873
874 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
875 err = 0;
876 v9ses = v9fs_inode2v9ses(dir);
877
878 mode |= S_IFDIR;
879 dir_dentry = v9fs_dentry_from_dir_inode(dir);
880 dfid = v9fs_fid_lookup(dir_dentry);
881 if (IS_ERR(dfid)) {
882 err = PTR_ERR(dfid);
883 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
884 dfid = NULL;
885 goto error;
886 }
887
888 gid = v9fs_get_fsgid_for_create(dir);
889 if (gid < 0) {
890 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_get_fsgid_for_create failed\n");
891 goto error;
892 }
893
894 name = (char *) dentry->d_name.name;
895 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
896 if (err < 0)
897 goto error;
898
899 /* instantiate inode and assign the unopened fid to the dentry */
900 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
901 fid = p9_client_walk(dfid, 1, &name, 1);
902 if (IS_ERR(fid)) {
903 err = PTR_ERR(fid);
904 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
905 err);
906 fid = NULL;
907 goto error;
908 }
909
910 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
911 if (IS_ERR(inode)) {
912 err = PTR_ERR(inode);
913 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
914 err);
915 goto error;
916 }
917 dentry->d_op = &v9fs_cached_dentry_operations;
918 d_instantiate(dentry, inode);
919 err = v9fs_fid_add(dentry, fid);
920 if (err < 0)
921 goto error;
922 fid = NULL;
923 }
924 error:
925 if (fid)
926 p9_client_clunk(fid);
927 return err;
928 }
929
930 /**
931 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
932 * @dir: inode that is being walked from
933 * @dentry: dentry that is being walked to?
934 * @nameidata: path data
935 *
936 */
937
938 static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
939 struct nameidata *nameidata)
940 {
941 struct super_block *sb;
942 struct v9fs_session_info *v9ses;
943 struct p9_fid *dfid, *fid;
944 struct inode *inode;
945 char *name;
946 int result = 0;
947
948 P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
949 dir, dentry->d_name.name, dentry, nameidata);
950
951 if (dentry->d_name.len > NAME_MAX)
952 return ERR_PTR(-ENAMETOOLONG);
953
954 sb = dir->i_sb;
955 v9ses = v9fs_inode2v9ses(dir);
956 /* We can walk d_parent because we hold the dir->i_mutex */
957 dfid = v9fs_fid_lookup(dentry->d_parent);
958 if (IS_ERR(dfid))
959 return ERR_CAST(dfid);
960
961 name = (char *) dentry->d_name.name;
962 fid = p9_client_walk(dfid, 1, &name, 1);
963 if (IS_ERR(fid)) {
964 result = PTR_ERR(fid);
965 if (result == -ENOENT) {
966 inode = NULL;
967 goto inst_out;
968 }
969
970 return ERR_PTR(result);
971 }
972
973 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
974 if (IS_ERR(inode)) {
975 result = PTR_ERR(inode);
976 inode = NULL;
977 goto error;
978 }
979
980 result = v9fs_fid_add(dentry, fid);
981 if (result < 0)
982 goto error;
983
984 inst_out:
985 if (v9ses->cache)
986 dentry->d_op = &v9fs_cached_dentry_operations;
987 else
988 dentry->d_op = &v9fs_dentry_operations;
989
990 d_add(dentry, inode);
991 return NULL;
992
993 error:
994 p9_client_clunk(fid);
995
996 return ERR_PTR(result);
997 }
998
999 /**
1000 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
1001 * @i: inode that is being unlinked
1002 * @d: dentry that is being unlinked
1003 *
1004 */
1005
1006 static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
1007 {
1008 return v9fs_remove(i, d, 0);
1009 }
1010
1011 /**
1012 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
1013 * @i: inode that is being unlinked
1014 * @d: dentry that is being unlinked
1015 *
1016 */
1017
1018 static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
1019 {
1020 return v9fs_remove(i, d, 1);
1021 }
1022
1023 /**
1024 * v9fs_vfs_rename - VFS hook to rename an inode
1025 * @old_dir: old dir inode
1026 * @old_dentry: old dentry
1027 * @new_dir: new dir inode
1028 * @new_dentry: new dentry
1029 *
1030 */
1031
1032 static int
1033 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1034 struct inode *new_dir, struct dentry *new_dentry)
1035 {
1036 struct inode *old_inode;
1037 struct v9fs_session_info *v9ses;
1038 struct p9_fid *oldfid;
1039 struct p9_fid *olddirfid;
1040 struct p9_fid *newdirfid;
1041 struct p9_wstat wstat;
1042 int retval;
1043
1044 P9_DPRINTK(P9_DEBUG_VFS, "\n");
1045 retval = 0;
1046 old_inode = old_dentry->d_inode;
1047 v9ses = v9fs_inode2v9ses(old_inode);
1048 oldfid = v9fs_fid_lookup(old_dentry);
1049 if (IS_ERR(oldfid))
1050 return PTR_ERR(oldfid);
1051
1052 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
1053 if (IS_ERR(olddirfid)) {
1054 retval = PTR_ERR(olddirfid);
1055 goto done;
1056 }
1057
1058 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
1059 if (IS_ERR(newdirfid)) {
1060 retval = PTR_ERR(newdirfid);
1061 goto clunk_olddir;
1062 }
1063
1064 down_write(&v9ses->rename_sem);
1065 if (v9fs_proto_dotl(v9ses)) {
1066 retval = p9_client_rename(oldfid, newdirfid,
1067 (char *) new_dentry->d_name.name);
1068 if (retval != -ENOSYS)
1069 goto clunk_newdir;
1070 }
1071 if (old_dentry->d_parent != new_dentry->d_parent) {
1072 /*
1073 * 9P .u can only handle file rename in the same directory
1074 */
1075
1076 P9_DPRINTK(P9_DEBUG_ERROR,
1077 "old dir and new dir are different\n");
1078 retval = -EXDEV;
1079 goto clunk_newdir;
1080 }
1081 v9fs_blank_wstat(&wstat);
1082 wstat.muid = v9ses->uname;
1083 wstat.name = (char *) new_dentry->d_name.name;
1084 retval = p9_client_wstat(oldfid, &wstat);
1085
1086 clunk_newdir:
1087 if (!retval)
1088 /* successful rename */
1089 d_move(old_dentry, new_dentry);
1090 up_write(&v9ses->rename_sem);
1091 p9_client_clunk(newdirfid);
1092
1093 clunk_olddir:
1094 p9_client_clunk(olddirfid);
1095
1096 done:
1097 return retval;
1098 }
1099
1100 /**
1101 * v9fs_vfs_getattr - retrieve file metadata
1102 * @mnt: mount information
1103 * @dentry: file to get attributes on
1104 * @stat: metadata structure to populate
1105 *
1106 */
1107
1108 static int
1109 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1110 struct kstat *stat)
1111 {
1112 int err;
1113 struct v9fs_session_info *v9ses;
1114 struct p9_fid *fid;
1115 struct p9_wstat *st;
1116
1117 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1118 err = -EPERM;
1119 v9ses = v9fs_inode2v9ses(dentry->d_inode);
1120 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
1121 return simple_getattr(mnt, dentry, stat);
1122
1123 fid = v9fs_fid_lookup(dentry);
1124 if (IS_ERR(fid))
1125 return PTR_ERR(fid);
1126
1127 st = p9_client_stat(fid);
1128 if (IS_ERR(st))
1129 return PTR_ERR(st);
1130
1131 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
1132 generic_fillattr(dentry->d_inode, stat);
1133
1134 p9stat_free(st);
1135 kfree(st);
1136 return 0;
1137 }
1138
1139 static int
1140 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
1141 struct kstat *stat)
1142 {
1143 int err;
1144 struct v9fs_session_info *v9ses;
1145 struct p9_fid *fid;
1146 struct p9_stat_dotl *st;
1147
1148 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1149 err = -EPERM;
1150 v9ses = v9fs_inode2v9ses(dentry->d_inode);
1151 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
1152 return simple_getattr(mnt, dentry, stat);
1153
1154 fid = v9fs_fid_lookup(dentry);
1155 if (IS_ERR(fid))
1156 return PTR_ERR(fid);
1157
1158 /* Ask for all the fields in stat structure. Server will return
1159 * whatever it supports
1160 */
1161
1162 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
1163 if (IS_ERR(st))
1164 return PTR_ERR(st);
1165
1166 v9fs_stat2inode_dotl(st, dentry->d_inode);
1167 generic_fillattr(dentry->d_inode, stat);
1168 /* Change block size to what the server returned */
1169 stat->blksize = st->st_blksize;
1170
1171 kfree(st);
1172 return 0;
1173 }
1174
1175 /**
1176 * v9fs_vfs_setattr - set file metadata
1177 * @dentry: file whose metadata to set
1178 * @iattr: metadata assignment structure
1179 *
1180 */
1181
1182 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
1183 {
1184 int retval;
1185 struct v9fs_session_info *v9ses;
1186 struct p9_fid *fid;
1187 struct p9_wstat wstat;
1188
1189 P9_DPRINTK(P9_DEBUG_VFS, "\n");
1190 retval = -EPERM;
1191 v9ses = v9fs_inode2v9ses(dentry->d_inode);
1192 fid = v9fs_fid_lookup(dentry);
1193 if(IS_ERR(fid))
1194 return PTR_ERR(fid);
1195
1196 v9fs_blank_wstat(&wstat);
1197 if (iattr->ia_valid & ATTR_MODE)
1198 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1199
1200 if (iattr->ia_valid & ATTR_MTIME)
1201 wstat.mtime = iattr->ia_mtime.tv_sec;
1202
1203 if (iattr->ia_valid & ATTR_ATIME)
1204 wstat.atime = iattr->ia_atime.tv_sec;
1205
1206 if (iattr->ia_valid & ATTR_SIZE)
1207 wstat.length = iattr->ia_size;
1208
1209 if (v9fs_proto_dotu(v9ses)) {
1210 if (iattr->ia_valid & ATTR_UID)
1211 wstat.n_uid = iattr->ia_uid;
1212
1213 if (iattr->ia_valid & ATTR_GID)
1214 wstat.n_gid = iattr->ia_gid;
1215 }
1216
1217 retval = p9_client_wstat(fid, &wstat);
1218 if (retval < 0)
1219 return retval;
1220
1221 if ((iattr->ia_valid & ATTR_SIZE) &&
1222 iattr->ia_size != i_size_read(dentry->d_inode)) {
1223 retval = vmtruncate(dentry->d_inode, iattr->ia_size);
1224 if (retval)
1225 return retval;
1226 }
1227
1228 setattr_copy(dentry->d_inode, iattr);
1229 mark_inode_dirty(dentry->d_inode);
1230 return 0;
1231 }
1232
1233 /**
1234 * v9fs_vfs_setattr_dotl - set file metadata
1235 * @dentry: file whose metadata to set
1236 * @iattr: metadata assignment structure
1237 *
1238 */
1239
1240 static int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
1241 {
1242 int retval;
1243 struct v9fs_session_info *v9ses;
1244 struct p9_fid *fid;
1245 struct p9_iattr_dotl p9attr;
1246
1247 P9_DPRINTK(P9_DEBUG_VFS, "\n");
1248
1249 retval = inode_change_ok(dentry->d_inode, iattr);
1250 if (retval)
1251 return retval;
1252
1253 p9attr.valid = iattr->ia_valid;
1254 p9attr.mode = iattr->ia_mode;
1255 p9attr.uid = iattr->ia_uid;
1256 p9attr.gid = iattr->ia_gid;
1257 p9attr.size = iattr->ia_size;
1258 p9attr.atime_sec = iattr->ia_atime.tv_sec;
1259 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
1260 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
1261 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
1262
1263 retval = -EPERM;
1264 v9ses = v9fs_inode2v9ses(dentry->d_inode);
1265 fid = v9fs_fid_lookup(dentry);
1266 if (IS_ERR(fid))
1267 return PTR_ERR(fid);
1268
1269 retval = p9_client_setattr(fid, &p9attr);
1270 if (retval < 0)
1271 return retval;
1272
1273 if ((iattr->ia_valid & ATTR_SIZE) &&
1274 iattr->ia_size != i_size_read(dentry->d_inode)) {
1275 retval = vmtruncate(dentry->d_inode, iattr->ia_size);
1276 if (retval)
1277 return retval;
1278 }
1279
1280 setattr_copy(dentry->d_inode, iattr);
1281 mark_inode_dirty(dentry->d_inode);
1282 return 0;
1283 }
1284
1285 /**
1286 * v9fs_stat2inode - populate an inode structure with mistat info
1287 * @stat: Plan 9 metadata (mistat) structure
1288 * @inode: inode to populate
1289 * @sb: superblock of filesystem
1290 *
1291 */
1292
1293 void
1294 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1295 struct super_block *sb)
1296 {
1297 char ext[32];
1298 char tag_name[14];
1299 unsigned int i_nlink;
1300 struct v9fs_session_info *v9ses = sb->s_fs_info;
1301
1302 inode->i_nlink = 1;
1303
1304 inode->i_atime.tv_sec = stat->atime;
1305 inode->i_mtime.tv_sec = stat->mtime;
1306 inode->i_ctime.tv_sec = stat->mtime;
1307
1308 inode->i_uid = v9ses->dfltuid;
1309 inode->i_gid = v9ses->dfltgid;
1310
1311 if (v9fs_proto_dotu(v9ses)) {
1312 inode->i_uid = stat->n_uid;
1313 inode->i_gid = stat->n_gid;
1314 }
1315 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1316 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1317 /*
1318 * Hadlink support got added later to
1319 * to the .u extension. So there can be
1320 * server out there that doesn't support
1321 * this even with .u extension. So check
1322 * for non NULL stat->extension
1323 */
1324 strncpy(ext, stat->extension, sizeof(ext));
1325 /* HARDLINKCOUNT %u */
1326 sscanf(ext, "%13s %u", tag_name, &i_nlink);
1327 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1328 inode->i_nlink = i_nlink;
1329 }
1330 }
1331 inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
1332 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
1333 char type = 0;
1334 int major = -1;
1335 int minor = -1;
1336
1337 strncpy(ext, stat->extension, sizeof(ext));
1338 sscanf(ext, "%c %u %u", &type, &major, &minor);
1339 switch (type) {
1340 case 'c':
1341 inode->i_mode &= ~S_IFBLK;
1342 inode->i_mode |= S_IFCHR;
1343 break;
1344 case 'b':
1345 break;
1346 default:
1347 P9_DPRINTK(P9_DEBUG_ERROR,
1348 "Unknown special type %c %s\n", type,
1349 stat->extension);
1350 };
1351 inode->i_rdev = MKDEV(major, minor);
1352 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1353 } else
1354 inode->i_rdev = 0;
1355
1356 i_size_write(inode, stat->length);
1357
1358 /* not real number of blocks, but 512 byte ones ... */
1359 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
1360 }
1361
1362 /**
1363 * v9fs_stat2inode_dotl - populate an inode structure with stat info
1364 * @stat: stat structure
1365 * @inode: inode to populate
1366 * @sb: superblock of filesystem
1367 *
1368 */
1369
1370 void
1371 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
1372 {
1373
1374 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
1375 inode->i_atime.tv_sec = stat->st_atime_sec;
1376 inode->i_atime.tv_nsec = stat->st_atime_nsec;
1377 inode->i_mtime.tv_sec = stat->st_mtime_sec;
1378 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
1379 inode->i_ctime.tv_sec = stat->st_ctime_sec;
1380 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
1381 inode->i_uid = stat->st_uid;
1382 inode->i_gid = stat->st_gid;
1383 inode->i_nlink = stat->st_nlink;
1384 inode->i_mode = stat->st_mode;
1385 inode->i_rdev = new_decode_dev(stat->st_rdev);
1386
1387 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode)))
1388 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1389
1390 i_size_write(inode, stat->st_size);
1391 inode->i_blocks = stat->st_blocks;
1392 } else {
1393 if (stat->st_result_mask & P9_STATS_ATIME) {
1394 inode->i_atime.tv_sec = stat->st_atime_sec;
1395 inode->i_atime.tv_nsec = stat->st_atime_nsec;
1396 }
1397 if (stat->st_result_mask & P9_STATS_MTIME) {
1398 inode->i_mtime.tv_sec = stat->st_mtime_sec;
1399 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
1400 }
1401 if (stat->st_result_mask & P9_STATS_CTIME) {
1402 inode->i_ctime.tv_sec = stat->st_ctime_sec;
1403 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
1404 }
1405 if (stat->st_result_mask & P9_STATS_UID)
1406 inode->i_uid = stat->st_uid;
1407 if (stat->st_result_mask & P9_STATS_GID)
1408 inode->i_gid = stat->st_gid;
1409 if (stat->st_result_mask & P9_STATS_NLINK)
1410 inode->i_nlink = stat->st_nlink;
1411 if (stat->st_result_mask & P9_STATS_MODE) {
1412 inode->i_mode = stat->st_mode;
1413 if ((S_ISBLK(inode->i_mode)) ||
1414 (S_ISCHR(inode->i_mode)))
1415 init_special_inode(inode, inode->i_mode,
1416 inode->i_rdev);
1417 }
1418 if (stat->st_result_mask & P9_STATS_RDEV)
1419 inode->i_rdev = new_decode_dev(stat->st_rdev);
1420 if (stat->st_result_mask & P9_STATS_SIZE)
1421 i_size_write(inode, stat->st_size);
1422 if (stat->st_result_mask & P9_STATS_BLOCKS)
1423 inode->i_blocks = stat->st_blocks;
1424 }
1425 if (stat->st_result_mask & P9_STATS_GEN)
1426 inode->i_generation = stat->st_gen;
1427
1428 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
1429 * because the inode structure does not have fields for them.
1430 */
1431 }
1432
1433 /**
1434 * v9fs_qid2ino - convert qid into inode number
1435 * @qid: qid to hash
1436 *
1437 * BUG: potential for inode number collisions?
1438 */
1439
1440 ino_t v9fs_qid2ino(struct p9_qid *qid)
1441 {
1442 u64 path = qid->path + 2;
1443 ino_t i = 0;
1444
1445 if (sizeof(ino_t) == sizeof(path))
1446 memcpy(&i, &path, sizeof(ino_t));
1447 else
1448 i = (ino_t) (path ^ (path >> 32));
1449
1450 return i;
1451 }
1452
1453 /**
1454 * v9fs_readlink - read a symlink's location (internal version)
1455 * @dentry: dentry for symlink
1456 * @buffer: buffer to load symlink location into
1457 * @buflen: length of buffer
1458 *
1459 */
1460
1461 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1462 {
1463 int retval;
1464
1465 struct v9fs_session_info *v9ses;
1466 struct p9_fid *fid;
1467 struct p9_wstat *st;
1468
1469 P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1470 retval = -EPERM;
1471 v9ses = v9fs_inode2v9ses(dentry->d_inode);
1472 fid = v9fs_fid_lookup(dentry);
1473 if (IS_ERR(fid))
1474 return PTR_ERR(fid);
1475
1476 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses))
1477 return -EBADF;
1478
1479 st = p9_client_stat(fid);
1480 if (IS_ERR(st))
1481 return PTR_ERR(st);
1482
1483 if (!(st->mode & P9_DMSYMLINK)) {
1484 retval = -EINVAL;
1485 goto done;
1486 }
1487
1488 /* copy extension buffer into buffer */
1489 strncpy(buffer, st->extension, buflen);
1490
1491 P9_DPRINTK(P9_DEBUG_VFS,
1492 "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer);
1493
1494 retval = strnlen(buffer, buflen);
1495 done:
1496 p9stat_free(st);
1497 kfree(st);
1498 return retval;
1499 }
1500
1501 /**
1502 * v9fs_vfs_follow_link - follow a symlink path
1503 * @dentry: dentry for symlink
1504 * @nd: nameidata
1505 *
1506 */
1507
1508 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1509 {
1510 int len = 0;
1511 char *link = __getname();
1512
1513 P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
1514
1515 if (!link)
1516 link = ERR_PTR(-ENOMEM);
1517 else {
1518 len = v9fs_readlink(dentry, link, PATH_MAX);
1519
1520 if (len < 0) {
1521 __putname(link);
1522 link = ERR_PTR(len);
1523 } else
1524 link[min(len, PATH_MAX-1)] = 0;
1525 }
1526 nd_set_link(nd, link);
1527
1528 return NULL;
1529 }
1530
1531 /**
1532 * v9fs_vfs_put_link - release a symlink path
1533 * @dentry: dentry for symlink
1534 * @nd: nameidata
1535 * @p: unused
1536 *
1537 */
1538
1539 static void
1540 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1541 {
1542 char *s = nd_get_link(nd);
1543
1544 P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
1545 IS_ERR(s) ? "<error>" : s);
1546 if (!IS_ERR(s))
1547 __putname(s);
1548 }
1549
1550 /**
1551 * v9fs_vfs_mkspecial - create a special file
1552 * @dir: inode to create special file in
1553 * @dentry: dentry to create
1554 * @mode: mode to create special file
1555 * @extension: 9p2000.u format extension string representing special file
1556 *
1557 */
1558
1559 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1560 int mode, const char *extension)
1561 {
1562 u32 perm;
1563 struct v9fs_session_info *v9ses;
1564 struct p9_fid *fid;
1565
1566 v9ses = v9fs_inode2v9ses(dir);
1567 if (!v9fs_proto_dotu(v9ses)) {
1568 P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n");
1569 return -EPERM;
1570 }
1571
1572 perm = unixmode2p9mode(v9ses, mode);
1573 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1574 P9_OREAD);
1575 if (IS_ERR(fid))
1576 return PTR_ERR(fid);
1577
1578 p9_client_clunk(fid);
1579 return 0;
1580 }
1581
1582 /**
1583 * v9fs_vfs_symlink_dotl - helper function to create symlinks
1584 * @dir: directory inode containing symlink
1585 * @dentry: dentry for symlink
1586 * @symname: symlink data
1587 *
1588 * See Also: 9P2000.L RFC for more information
1589 *
1590 */
1591
1592 static int
1593 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
1594 const char *symname)
1595 {
1596 struct v9fs_session_info *v9ses;
1597 struct p9_fid *dfid;
1598 struct p9_fid *fid = NULL;
1599 struct inode *inode;
1600 struct p9_qid qid;
1601 char *name;
1602 int err;
1603 gid_t gid;
1604
1605 name = (char *) dentry->d_name.name;
1606 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
1607 dir->i_ino, name, symname);
1608 v9ses = v9fs_inode2v9ses(dir);
1609
1610 dfid = v9fs_fid_lookup(dentry->d_parent);
1611 if (IS_ERR(dfid)) {
1612 err = PTR_ERR(dfid);
1613 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
1614 return err;
1615 }
1616
1617 gid = v9fs_get_fsgid_for_create(dir);
1618
1619 if (gid < 0) {
1620 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_get_egid failed %d\n", gid);
1621 goto error;
1622 }
1623
1624 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
1625 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
1626
1627 if (err < 0) {
1628 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
1629 goto error;
1630 }
1631
1632 if (v9ses->cache) {
1633 /* Now walk from the parent so we can get an unopened fid. */
1634 fid = p9_client_walk(dfid, 1, &name, 1);
1635 if (IS_ERR(fid)) {
1636 err = PTR_ERR(fid);
1637 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
1638 err);
1639 fid = NULL;
1640 goto error;
1641 }
1642
1643 /* instantiate inode and assign the unopened fid to dentry */
1644 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
1645 if (IS_ERR(inode)) {
1646 err = PTR_ERR(inode);
1647 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
1648 err);
1649 goto error;
1650 }
1651 dentry->d_op = &v9fs_cached_dentry_operations;
1652 d_instantiate(dentry, inode);
1653 err = v9fs_fid_add(dentry, fid);
1654 if (err < 0)
1655 goto error;
1656 fid = NULL;
1657 } else {
1658 /* Not in cached mode. No need to populate inode with stat */
1659 inode = v9fs_get_inode(dir->i_sb, S_IFLNK);
1660 if (IS_ERR(inode)) {
1661 err = PTR_ERR(inode);
1662 goto error;
1663 }
1664 dentry->d_op = &v9fs_dentry_operations;
1665 d_instantiate(dentry, inode);
1666 }
1667
1668 error:
1669 if (fid)
1670 p9_client_clunk(fid);
1671
1672 return err;
1673 }
1674
1675 /**
1676 * v9fs_vfs_symlink - helper function to create symlinks
1677 * @dir: directory inode containing symlink
1678 * @dentry: dentry for symlink
1679 * @symname: symlink data
1680 *
1681 * See Also: 9P2000.u RFC for more information
1682 *
1683 */
1684
1685 static int
1686 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1687 {
1688 P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino,
1689 dentry->d_name.name, symname);
1690
1691 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1692 }
1693
1694 /**
1695 * v9fs_vfs_link - create a hardlink
1696 * @old_dentry: dentry for file to link to
1697 * @dir: inode destination for new link
1698 * @dentry: dentry for link
1699 *
1700 */
1701
1702 static int
1703 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1704 struct dentry *dentry)
1705 {
1706 int retval;
1707 struct p9_fid *oldfid;
1708 char *name;
1709
1710 P9_DPRINTK(P9_DEBUG_VFS,
1711 " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1712 old_dentry->d_name.name);
1713
1714 oldfid = v9fs_fid_clone(old_dentry);
1715 if (IS_ERR(oldfid))
1716 return PTR_ERR(oldfid);
1717
1718 name = __getname();
1719 if (unlikely(!name)) {
1720 retval = -ENOMEM;
1721 goto clunk_fid;
1722 }
1723
1724 sprintf(name, "%d\n", oldfid->fid);
1725 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1726 __putname(name);
1727
1728 clunk_fid:
1729 p9_client_clunk(oldfid);
1730 return retval;
1731 }
1732
1733 /**
1734 * v9fs_vfs_link_dotl - create a hardlink for dotl
1735 * @old_dentry: dentry for file to link to
1736 * @dir: inode destination for new link
1737 * @dentry: dentry for link
1738 *
1739 */
1740
1741 static int
1742 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
1743 struct dentry *dentry)
1744 {
1745 int err;
1746 struct p9_fid *dfid, *oldfid;
1747 char *name;
1748 struct v9fs_session_info *v9ses;
1749 struct dentry *dir_dentry;
1750
1751 P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
1752 dir->i_ino, old_dentry->d_name.name,
1753 dentry->d_name.name);
1754
1755 v9ses = v9fs_inode2v9ses(dir);
1756 dir_dentry = v9fs_dentry_from_dir_inode(dir);
1757 dfid = v9fs_fid_lookup(dir_dentry);
1758 if (IS_ERR(dfid))
1759 return PTR_ERR(dfid);
1760
1761 oldfid = v9fs_fid_lookup(old_dentry);
1762 if (IS_ERR(oldfid))
1763 return PTR_ERR(oldfid);
1764
1765 name = (char *) dentry->d_name.name;
1766
1767 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
1768
1769 if (err < 0) {
1770 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
1771 return err;
1772 }
1773
1774 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1775 /* Get the latest stat info from server. */
1776 struct p9_fid *fid;
1777 struct p9_stat_dotl *st;
1778
1779 fid = v9fs_fid_lookup(old_dentry);
1780 if (IS_ERR(fid))
1781 return PTR_ERR(fid);
1782
1783 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
1784 if (IS_ERR(st))
1785 return PTR_ERR(st);
1786
1787 v9fs_stat2inode_dotl(st, old_dentry->d_inode);
1788
1789 kfree(st);
1790 } else {
1791 /* Caching disabled. No need to get upto date stat info.
1792 * This dentry will be released immediately. So, just i_count++
1793 */
1794 atomic_inc(&old_dentry->d_inode->i_count);
1795 }
1796
1797 dentry->d_op = old_dentry->d_op;
1798 d_instantiate(dentry, old_dentry->d_inode);
1799
1800 return err;
1801 }
1802
1803 /**
1804 * v9fs_vfs_mknod - create a special file
1805 * @dir: inode destination for new link
1806 * @dentry: dentry for file
1807 * @mode: mode for creation
1808 * @rdev: device associated with special file
1809 *
1810 */
1811
1812 static int
1813 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1814 {
1815 int retval;
1816 char *name;
1817
1818 P9_DPRINTK(P9_DEBUG_VFS,
1819 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1820 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1821
1822 if (!new_valid_dev(rdev))
1823 return -EINVAL;
1824
1825 name = __getname();
1826 if (!name)
1827 return -ENOMEM;
1828 /* build extension */
1829 if (S_ISBLK(mode))
1830 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1831 else if (S_ISCHR(mode))
1832 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1833 else if (S_ISFIFO(mode))
1834 *name = 0;
1835 else if (S_ISSOCK(mode))
1836 *name = 0;
1837 else {
1838 __putname(name);
1839 return -EINVAL;
1840 }
1841
1842 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1843 __putname(name);
1844
1845 return retval;
1846 }
1847
1848 /**
1849 * v9fs_vfs_mknod_dotl - create a special file
1850 * @dir: inode destination for new link
1851 * @dentry: dentry for file
1852 * @mode: mode for creation
1853 * @rdev: device associated with special file
1854 *
1855 */
1856 static int
1857 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int mode,
1858 dev_t rdev)
1859 {
1860 int err;
1861 char *name;
1862 struct v9fs_session_info *v9ses;
1863 struct p9_fid *fid = NULL, *dfid = NULL;
1864 struct inode *inode;
1865 gid_t gid;
1866 struct p9_qid qid;
1867 struct dentry *dir_dentry;
1868
1869 P9_DPRINTK(P9_DEBUG_VFS,
1870 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1871 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1872
1873 if (!new_valid_dev(rdev))
1874 return -EINVAL;
1875
1876 v9ses = v9fs_inode2v9ses(dir);
1877 dir_dentry = v9fs_dentry_from_dir_inode(dir);
1878 dfid = v9fs_fid_lookup(dir_dentry);
1879 if (IS_ERR(dfid)) {
1880 err = PTR_ERR(dfid);
1881 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
1882 dfid = NULL;
1883 goto error;
1884 }
1885
1886 gid = v9fs_get_fsgid_for_create(dir);
1887 if (gid < 0) {
1888 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_get_fsgid_for_create failed\n");
1889 goto error;
1890 }
1891
1892 name = (char *) dentry->d_name.name;
1893
1894 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
1895 if (err < 0)
1896 goto error;
1897
1898 /* instantiate inode and assign the unopened fid to the dentry */
1899 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1900 fid = p9_client_walk(dfid, 1, &name, 1);
1901 if (IS_ERR(fid)) {
1902 err = PTR_ERR(fid);
1903 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
1904 err);
1905 fid = NULL;
1906 goto error;
1907 }
1908
1909 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
1910 if (IS_ERR(inode)) {
1911 err = PTR_ERR(inode);
1912 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
1913 err);
1914 goto error;
1915 }
1916 dentry->d_op = &v9fs_cached_dentry_operations;
1917 d_instantiate(dentry, inode);
1918 err = v9fs_fid_add(dentry, fid);
1919 if (err < 0)
1920 goto error;
1921 fid = NULL;
1922 } else {
1923 /*
1924 * Not in cached mode. No need to populate inode with stat.
1925 * socket syscall returns a fd, so we need instantiate
1926 */
1927 inode = v9fs_get_inode(dir->i_sb, mode);
1928 if (IS_ERR(inode)) {
1929 err = PTR_ERR(inode);
1930 goto error;
1931 }
1932 dentry->d_op = &v9fs_dentry_operations;
1933 d_instantiate(dentry, inode);
1934 }
1935
1936 error:
1937 if (fid)
1938 p9_client_clunk(fid);
1939 return err;
1940 }
1941
1942 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1943 .create = v9fs_vfs_create,
1944 .lookup = v9fs_vfs_lookup,
1945 .symlink = v9fs_vfs_symlink,
1946 .link = v9fs_vfs_link,
1947 .unlink = v9fs_vfs_unlink,
1948 .mkdir = v9fs_vfs_mkdir,
1949 .rmdir = v9fs_vfs_rmdir,
1950 .mknod = v9fs_vfs_mknod,
1951 .rename = v9fs_vfs_rename,
1952 .getattr = v9fs_vfs_getattr,
1953 .setattr = v9fs_vfs_setattr,
1954 };
1955
1956 static const struct inode_operations v9fs_dir_inode_operations_dotl = {
1957 .create = v9fs_vfs_create_dotl,
1958 .lookup = v9fs_vfs_lookup,
1959 .link = v9fs_vfs_link_dotl,
1960 .symlink = v9fs_vfs_symlink_dotl,
1961 .unlink = v9fs_vfs_unlink,
1962 .mkdir = v9fs_vfs_mkdir_dotl,
1963 .rmdir = v9fs_vfs_rmdir,
1964 .mknod = v9fs_vfs_mknod_dotl,
1965 .rename = v9fs_vfs_rename,
1966 .getattr = v9fs_vfs_getattr_dotl,
1967 .setattr = v9fs_vfs_setattr_dotl,
1968 .setxattr = generic_setxattr,
1969 .getxattr = generic_getxattr,
1970 .removexattr = generic_removexattr,
1971 .listxattr = v9fs_listxattr,
1972
1973 };
1974
1975 static const struct inode_operations v9fs_dir_inode_operations = {
1976 .create = v9fs_vfs_create,
1977 .lookup = v9fs_vfs_lookup,
1978 .unlink = v9fs_vfs_unlink,
1979 .mkdir = v9fs_vfs_mkdir,
1980 .rmdir = v9fs_vfs_rmdir,
1981 .mknod = v9fs_vfs_mknod,
1982 .rename = v9fs_vfs_rename,
1983 .getattr = v9fs_vfs_getattr,
1984 .setattr = v9fs_vfs_setattr,
1985 };
1986
1987 static const struct inode_operations v9fs_file_inode_operations = {
1988 .getattr = v9fs_vfs_getattr,
1989 .setattr = v9fs_vfs_setattr,
1990 };
1991
1992 static const struct inode_operations v9fs_file_inode_operations_dotl = {
1993 .getattr = v9fs_vfs_getattr_dotl,
1994 .setattr = v9fs_vfs_setattr_dotl,
1995 .setxattr = generic_setxattr,
1996 .getxattr = generic_getxattr,
1997 .removexattr = generic_removexattr,
1998 .listxattr = v9fs_listxattr,
1999 };
2000
2001 static const struct inode_operations v9fs_symlink_inode_operations = {
2002 .readlink = generic_readlink,
2003 .follow_link = v9fs_vfs_follow_link,
2004 .put_link = v9fs_vfs_put_link,
2005 .getattr = v9fs_vfs_getattr,
2006 .setattr = v9fs_vfs_setattr,
2007 };
2008
2009 static const struct inode_operations v9fs_symlink_inode_operations_dotl = {
2010 .readlink = generic_readlink,
2011 .follow_link = v9fs_vfs_follow_link,
2012 .put_link = v9fs_vfs_put_link,
2013 .getattr = v9fs_vfs_getattr_dotl,
2014 .setattr = v9fs_vfs_setattr_dotl,
2015 .setxattr = generic_setxattr,
2016 .getxattr = generic_getxattr,
2017 .removexattr = generic_removexattr,
2018 .listxattr = v9fs_listxattr,
2019 };
Linux with added FPC-III support