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Merge branch 'media_fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[cris-mirror.git] / fs / fuse / dir.c
blobbfed8447ed8090d8e233ef44f6d8eb13a440de10
1 /*
2 FUSE: Filesystem in Userspace
3 Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu>
4
5 This program can be distributed under the terms of the GNU GPL.
6 See the file COPYING.
7 */
8
9 #include "fuse_i.h"
10
11 #include <linux/pagemap.h>
12 #include <linux/file.h>
13 #include <linux/sched.h>
14 #include <linux/namei.h>
15 #include <linux/slab.h>
16
17 #if BITS_PER_LONG >= 64
18 static inline void fuse_dentry_settime(struct dentry *entry, u64 time)
19 {
20 entry->d_time = time;
21 }
22
23 static inline u64 fuse_dentry_time(struct dentry *entry)
24 {
25 return entry->d_time;
26 }
27 #else
28 /*
29 * On 32 bit archs store the high 32 bits of time in d_fsdata
30 */
31 static void fuse_dentry_settime(struct dentry *entry, u64 time)
32 {
33 entry->d_time = time;
34 entry->d_fsdata = (void *) (unsigned long) (time >> 32);
35 }
36
37 static u64 fuse_dentry_time(struct dentry *entry)
38 {
39 return (u64) entry->d_time +
40 ((u64) (unsigned long) entry->d_fsdata << 32);
41 }
42 #endif
43
44 /*
45 * FUSE caches dentries and attributes with separate timeout. The
46 * time in jiffies until the dentry/attributes are valid is stored in
47 * dentry->d_time and fuse_inode->i_time respectively.
48 */
49
50 /*
51 * Calculate the time in jiffies until a dentry/attributes are valid
52 */
53 static u64 time_to_jiffies(unsigned long sec, unsigned long nsec)
54 {
55 if (sec || nsec) {
56 struct timespec ts = {sec, nsec};
57 return get_jiffies_64() + timespec_to_jiffies(&ts);
58 } else
59 return 0;
60 }
61
62 /*
63 * Set dentry and possibly attribute timeouts from the lookup/mk*
64 * replies
65 */
66 static void fuse_change_entry_timeout(struct dentry *entry,
67 struct fuse_entry_out *o)
68 {
69 fuse_dentry_settime(entry,
70 time_to_jiffies(o->entry_valid, o->entry_valid_nsec));
71 }
72
73 static u64 attr_timeout(struct fuse_attr_out *o)
74 {
75 return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
76 }
77
78 static u64 entry_attr_timeout(struct fuse_entry_out *o)
79 {
80 return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
81 }
82
83 /*
84 * Mark the attributes as stale, so that at the next call to
85 * ->getattr() they will be fetched from userspace
86 */
87 void fuse_invalidate_attr(struct inode *inode)
88 {
89 get_fuse_inode(inode)->i_time = 0;
90 }
91
92 /*
93 * Just mark the entry as stale, so that a next attempt to look it up
94 * will result in a new lookup call to userspace
95 *
96 * This is called when a dentry is about to become negative and the
97 * timeout is unknown (unlink, rmdir, rename and in some cases
98 * lookup)
99 */
100 void fuse_invalidate_entry_cache(struct dentry *entry)
101 {
102 fuse_dentry_settime(entry, 0);
103 }
104
105 /*
106 * Same as fuse_invalidate_entry_cache(), but also try to remove the
107 * dentry from the hash
108 */
109 static void fuse_invalidate_entry(struct dentry *entry)
110 {
111 d_invalidate(entry);
112 fuse_invalidate_entry_cache(entry);
113 }
114
115 static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_req *req,
116 u64 nodeid, struct qstr *name,
117 struct fuse_entry_out *outarg)
118 {
119 memset(outarg, 0, sizeof(struct fuse_entry_out));
120 req->in.h.opcode = FUSE_LOOKUP;
121 req->in.h.nodeid = nodeid;
122 req->in.numargs = 1;
123 req->in.args[0].size = name->len + 1;
124 req->in.args[0].value = name->name;
125 req->out.numargs = 1;
126 if (fc->minor < 9)
127 req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
128 else
129 req->out.args[0].size = sizeof(struct fuse_entry_out);
130 req->out.args[0].value = outarg;
131 }
132
133 u64 fuse_get_attr_version(struct fuse_conn *fc)
134 {
135 u64 curr_version;
136
137 /*
138 * The spin lock isn't actually needed on 64bit archs, but we
139 * don't yet care too much about such optimizations.
140 */
141 spin_lock(&fc->lock);
142 curr_version = fc->attr_version;
143 spin_unlock(&fc->lock);
144
145 return curr_version;
146 }
147
148 /*
149 * Check whether the dentry is still valid
150 *
151 * If the entry validity timeout has expired and the dentry is
152 * positive, try to redo the lookup. If the lookup results in a
153 * different inode, then let the VFS invalidate the dentry and redo
154 * the lookup once more. If the lookup results in the same inode,
155 * then refresh the attributes, timeouts and mark the dentry valid.
156 */
157 static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
158 {
159 struct inode *inode;
160
161 if (nd->flags & LOOKUP_RCU)
162 return -ECHILD;
163
164 inode = entry->d_inode;
165 if (inode && is_bad_inode(inode))
166 return 0;
167 else if (fuse_dentry_time(entry) < get_jiffies_64()) {
168 int err;
169 struct fuse_entry_out outarg;
170 struct fuse_conn *fc;
171 struct fuse_req *req;
172 struct fuse_forget_link *forget;
173 struct dentry *parent;
174 u64 attr_version;
175
176 /* For negative dentries, always do a fresh lookup */
177 if (!inode)
178 return 0;
179
180 fc = get_fuse_conn(inode);
181 req = fuse_get_req(fc);
182 if (IS_ERR(req))
183 return 0;
184
185 forget = fuse_alloc_forget();
186 if (!forget) {
187 fuse_put_request(fc, req);
188 return 0;
189 }
190
191 attr_version = fuse_get_attr_version(fc);
192
193 parent = dget_parent(entry);
194 fuse_lookup_init(fc, req, get_node_id(parent->d_inode),
195 &entry->d_name, &outarg);
196 fuse_request_send(fc, req);
197 dput(parent);
198 err = req->out.h.error;
199 fuse_put_request(fc, req);
200 /* Zero nodeid is same as -ENOENT */
201 if (!err && !outarg.nodeid)
202 err = -ENOENT;
203 if (!err) {
204 struct fuse_inode *fi = get_fuse_inode(inode);
205 if (outarg.nodeid != get_node_id(inode)) {
206 fuse_queue_forget(fc, forget, outarg.nodeid, 1);
207 return 0;
208 }
209 spin_lock(&fc->lock);
210 fi->nlookup++;
211 spin_unlock(&fc->lock);
212 }
213 kfree(forget);
214 if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
215 return 0;
216
217 fuse_change_attributes(inode, &outarg.attr,
218 entry_attr_timeout(&outarg),
219 attr_version);
220 fuse_change_entry_timeout(entry, &outarg);
221 }
222 return 1;
223 }
224
225 static int invalid_nodeid(u64 nodeid)
226 {
227 return !nodeid || nodeid == FUSE_ROOT_ID;
228 }
229
230 const struct dentry_operations fuse_dentry_operations = {
231 .d_revalidate = fuse_dentry_revalidate,
232 };
233
234 int fuse_valid_type(int m)
235 {
236 return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) ||
237 S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m);
238 }
239
240 /*
241 * Add a directory inode to a dentry, ensuring that no other dentry
242 * refers to this inode. Called with fc->inst_mutex.
243 */
244 static struct dentry *fuse_d_add_directory(struct dentry *entry,
245 struct inode *inode)
246 {
247 struct dentry *alias = d_find_alias(inode);
248 if (alias && !(alias->d_flags & DCACHE_DISCONNECTED)) {
249 /* This tries to shrink the subtree below alias */
250 fuse_invalidate_entry(alias);
251 dput(alias);
252 if (!list_empty(&inode->i_dentry))
253 return ERR_PTR(-EBUSY);
254 } else {
255 dput(alias);
256 }
257 return d_splice_alias(inode, entry);
258 }
259
260 int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
261 struct fuse_entry_out *outarg, struct inode **inode)
262 {
263 struct fuse_conn *fc = get_fuse_conn_super(sb);
264 struct fuse_req *req;
265 struct fuse_forget_link *forget;
266 u64 attr_version;
267 int err;
268
269 *inode = NULL;
270 err = -ENAMETOOLONG;
271 if (name->len > FUSE_NAME_MAX)
272 goto out;
273
274 req = fuse_get_req(fc);
275 err = PTR_ERR(req);
276 if (IS_ERR(req))
277 goto out;
278
279 forget = fuse_alloc_forget();
280 err = -ENOMEM;
281 if (!forget) {
282 fuse_put_request(fc, req);
283 goto out;
284 }
285
286 attr_version = fuse_get_attr_version(fc);
287
288 fuse_lookup_init(fc, req, nodeid, name, outarg);
289 fuse_request_send(fc, req);
290 err = req->out.h.error;
291 fuse_put_request(fc, req);
292 /* Zero nodeid is same as -ENOENT, but with valid timeout */
293 if (err || !outarg->nodeid)
294 goto out_put_forget;
295
296 err = -EIO;
297 if (!outarg->nodeid)
298 goto out_put_forget;
299 if (!fuse_valid_type(outarg->attr.mode))
300 goto out_put_forget;
301
302 *inode = fuse_iget(sb, outarg->nodeid, outarg->generation,
303 &outarg->attr, entry_attr_timeout(outarg),
304 attr_version);
305 err = -ENOMEM;
306 if (!*inode) {
307 fuse_queue_forget(fc, forget, outarg->nodeid, 1);
308 goto out;
309 }
310 err = 0;
311
312 out_put_forget:
313 kfree(forget);
314 out:
315 return err;
316 }
317
318 static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
319 struct nameidata *nd)
320 {
321 int err;
322 struct fuse_entry_out outarg;
323 struct inode *inode;
324 struct dentry *newent;
325 struct fuse_conn *fc = get_fuse_conn(dir);
326 bool outarg_valid = true;
327
328 err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name,
329 &outarg, &inode);
330 if (err == -ENOENT) {
331 outarg_valid = false;
332 err = 0;
333 }
334 if (err)
335 goto out_err;
336
337 err = -EIO;
338 if (inode && get_node_id(inode) == FUSE_ROOT_ID)
339 goto out_iput;
340
341 if (inode && S_ISDIR(inode->i_mode)) {
342 mutex_lock(&fc->inst_mutex);
343 newent = fuse_d_add_directory(entry, inode);
344 mutex_unlock(&fc->inst_mutex);
345 err = PTR_ERR(newent);
346 if (IS_ERR(newent))
347 goto out_iput;
348 } else {
349 newent = d_splice_alias(inode, entry);
350 }
351
352 entry = newent ? newent : entry;
353 if (outarg_valid)
354 fuse_change_entry_timeout(entry, &outarg);
355 else
356 fuse_invalidate_entry_cache(entry);
357
358 return newent;
359
360 out_iput:
361 iput(inode);
362 out_err:
363 return ERR_PTR(err);
364 }
365
366 /*
367 * Atomic create+open operation
368 *
369 * If the filesystem doesn't support this, then fall back to separate
370 * 'mknod' + 'open' requests.
371 */
372 static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
373 struct nameidata *nd)
374 {
375 int err;
376 struct inode *inode;
377 struct fuse_conn *fc = get_fuse_conn(dir);
378 struct fuse_req *req;
379 struct fuse_forget_link *forget;
380 struct fuse_create_in inarg;
381 struct fuse_open_out outopen;
382 struct fuse_entry_out outentry;
383 struct fuse_file *ff;
384 struct file *file;
385 int flags = nd->intent.open.flags - 1;
386
387 if (fc->no_create)
388 return -ENOSYS;
389
390 if (flags & O_DIRECT)
391 return -EINVAL;
392
393 forget = fuse_alloc_forget();
394 if (!forget)
395 return -ENOMEM;
396
397 req = fuse_get_req(fc);
398 err = PTR_ERR(req);
399 if (IS_ERR(req))
400 goto out_put_forget_req;
401
402 err = -ENOMEM;
403 ff = fuse_file_alloc(fc);
404 if (!ff)
405 goto out_put_request;
406
407 if (!fc->dont_mask)
408 mode &= ~current_umask();
409
410 flags &= ~O_NOCTTY;
411 memset(&inarg, 0, sizeof(inarg));
412 memset(&outentry, 0, sizeof(outentry));
413 inarg.flags = flags;
414 inarg.mode = mode;
415 inarg.umask = current_umask();
416 req->in.h.opcode = FUSE_CREATE;
417 req->in.h.nodeid = get_node_id(dir);
418 req->in.numargs = 2;
419 req->in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) :
420 sizeof(inarg);
421 req->in.args[0].value = &inarg;
422 req->in.args[1].size = entry->d_name.len + 1;
423 req->in.args[1].value = entry->d_name.name;
424 req->out.numargs = 2;
425 if (fc->minor < 9)
426 req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
427 else
428 req->out.args[0].size = sizeof(outentry);
429 req->out.args[0].value = &outentry;
430 req->out.args[1].size = sizeof(outopen);
431 req->out.args[1].value = &outopen;
432 fuse_request_send(fc, req);
433 err = req->out.h.error;
434 if (err) {
435 if (err == -ENOSYS)
436 fc->no_create = 1;
437 goto out_free_ff;
438 }
439
440 err = -EIO;
441 if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid))
442 goto out_free_ff;
443
444 fuse_put_request(fc, req);
445 ff->fh = outopen.fh;
446 ff->nodeid = outentry.nodeid;
447 ff->open_flags = outopen.open_flags;
448 inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation,
449 &outentry.attr, entry_attr_timeout(&outentry), 0);
450 if (!inode) {
451 flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
452 fuse_sync_release(ff, flags);
453 fuse_queue_forget(fc, forget, outentry.nodeid, 1);
454 return -ENOMEM;
455 }
456 kfree(forget);
457 d_instantiate(entry, inode);
458 fuse_change_entry_timeout(entry, &outentry);
459 fuse_invalidate_attr(dir);
460 file = lookup_instantiate_filp(nd, entry, generic_file_open);
461 if (IS_ERR(file)) {
462 fuse_sync_release(ff, flags);
463 return PTR_ERR(file);
464 }
465 file->private_data = fuse_file_get(ff);
466 fuse_finish_open(inode, file);
467 return 0;
468
469 out_free_ff:
470 fuse_file_free(ff);
471 out_put_request:
472 fuse_put_request(fc, req);
473 out_put_forget_req:
474 kfree(forget);
475 return err;
476 }
477
478 /*
479 * Code shared between mknod, mkdir, symlink and link
480 */
481 static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
482 struct inode *dir, struct dentry *entry,
483 int mode)
484 {
485 struct fuse_entry_out outarg;
486 struct inode *inode;
487 int err;
488 struct fuse_forget_link *forget;
489
490 forget = fuse_alloc_forget();
491 if (!forget) {
492 fuse_put_request(fc, req);
493 return -ENOMEM;
494 }
495
496 memset(&outarg, 0, sizeof(outarg));
497 req->in.h.nodeid = get_node_id(dir);
498 req->out.numargs = 1;
499 if (fc->minor < 9)
500 req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
501 else
502 req->out.args[0].size = sizeof(outarg);
503 req->out.args[0].value = &outarg;
504 fuse_request_send(fc, req);
505 err = req->out.h.error;
506 fuse_put_request(fc, req);
507 if (err)
508 goto out_put_forget_req;
509
510 err = -EIO;
511 if (invalid_nodeid(outarg.nodeid))
512 goto out_put_forget_req;
513
514 if ((outarg.attr.mode ^ mode) & S_IFMT)
515 goto out_put_forget_req;
516
517 inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
518 &outarg.attr, entry_attr_timeout(&outarg), 0);
519 if (!inode) {
520 fuse_queue_forget(fc, forget, outarg.nodeid, 1);
521 return -ENOMEM;
522 }
523 kfree(forget);
524
525 if (S_ISDIR(inode->i_mode)) {
526 struct dentry *alias;
527 mutex_lock(&fc->inst_mutex);
528 alias = d_find_alias(inode);
529 if (alias) {
530 /* New directory must have moved since mkdir */
531 mutex_unlock(&fc->inst_mutex);
532 dput(alias);
533 iput(inode);
534 return -EBUSY;
535 }
536 d_instantiate(entry, inode);
537 mutex_unlock(&fc->inst_mutex);
538 } else
539 d_instantiate(entry, inode);
540
541 fuse_change_entry_timeout(entry, &outarg);
542 fuse_invalidate_attr(dir);
543 return 0;
544
545 out_put_forget_req:
546 kfree(forget);
547 return err;
548 }
549
550 static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode,
551 dev_t rdev)
552 {
553 struct fuse_mknod_in inarg;
554 struct fuse_conn *fc = get_fuse_conn(dir);
555 struct fuse_req *req = fuse_get_req(fc);
556 if (IS_ERR(req))
557 return PTR_ERR(req);
558
559 if (!fc->dont_mask)
560 mode &= ~current_umask();
561
562 memset(&inarg, 0, sizeof(inarg));
563 inarg.mode = mode;
564 inarg.rdev = new_encode_dev(rdev);
565 inarg.umask = current_umask();
566 req->in.h.opcode = FUSE_MKNOD;
567 req->in.numargs = 2;
568 req->in.args[0].size = fc->minor < 12 ? FUSE_COMPAT_MKNOD_IN_SIZE :
569 sizeof(inarg);
570 req->in.args[0].value = &inarg;
571 req->in.args[1].size = entry->d_name.len + 1;
572 req->in.args[1].value = entry->d_name.name;
573 return create_new_entry(fc, req, dir, entry, mode);
574 }
575
576 static int fuse_create(struct inode *dir, struct dentry *entry, int mode,
577 struct nameidata *nd)
578 {
579 if (nd && (nd->flags & LOOKUP_OPEN)) {
580 int err = fuse_create_open(dir, entry, mode, nd);
581 if (err != -ENOSYS)
582 return err;
583 /* Fall back on mknod */
584 }
585 return fuse_mknod(dir, entry, mode, 0);
586 }
587
588 static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode)
589 {
590 struct fuse_mkdir_in inarg;
591 struct fuse_conn *fc = get_fuse_conn(dir);
592 struct fuse_req *req = fuse_get_req(fc);
593 if (IS_ERR(req))
594 return PTR_ERR(req);
595
596 if (!fc->dont_mask)
597 mode &= ~current_umask();
598
599 memset(&inarg, 0, sizeof(inarg));
600 inarg.mode = mode;
601 inarg.umask = current_umask();
602 req->in.h.opcode = FUSE_MKDIR;
603 req->in.numargs = 2;
604 req->in.args[0].size = sizeof(inarg);
605 req->in.args[0].value = &inarg;
606 req->in.args[1].size = entry->d_name.len + 1;
607 req->in.args[1].value = entry->d_name.name;
608 return create_new_entry(fc, req, dir, entry, S_IFDIR);
609 }
610
611 static int fuse_symlink(struct inode *dir, struct dentry *entry,
612 const char *link)
613 {
614 struct fuse_conn *fc = get_fuse_conn(dir);
615 unsigned len = strlen(link) + 1;
616 struct fuse_req *req = fuse_get_req(fc);
617 if (IS_ERR(req))
618 return PTR_ERR(req);
619
620 req->in.h.opcode = FUSE_SYMLINK;
621 req->in.numargs = 2;
622 req->in.args[0].size = entry->d_name.len + 1;
623 req->in.args[0].value = entry->d_name.name;
624 req->in.args[1].size = len;
625 req->in.args[1].value = link;
626 return create_new_entry(fc, req, dir, entry, S_IFLNK);
627 }
628
629 static int fuse_unlink(struct inode *dir, struct dentry *entry)
630 {
631 int err;
632 struct fuse_conn *fc = get_fuse_conn(dir);
633 struct fuse_req *req = fuse_get_req(fc);
634 if (IS_ERR(req))
635 return PTR_ERR(req);
636
637 req->in.h.opcode = FUSE_UNLINK;
638 req->in.h.nodeid = get_node_id(dir);
639 req->in.numargs = 1;
640 req->in.args[0].size = entry->d_name.len + 1;
641 req->in.args[0].value = entry->d_name.name;
642 fuse_request_send(fc, req);
643 err = req->out.h.error;
644 fuse_put_request(fc, req);
645 if (!err) {
646 struct inode *inode = entry->d_inode;
647
648 /*
649 * Set nlink to zero so the inode can be cleared, if the inode
650 * does have more links this will be discovered at the next
651 * lookup/getattr.
652 */
653 clear_nlink(inode);
654 fuse_invalidate_attr(inode);
655 fuse_invalidate_attr(dir);
656 fuse_invalidate_entry_cache(entry);
657 } else if (err == -EINTR)
658 fuse_invalidate_entry(entry);
659 return err;
660 }
661
662 static int fuse_rmdir(struct inode *dir, struct dentry *entry)
663 {
664 int err;
665 struct fuse_conn *fc = get_fuse_conn(dir);
666 struct fuse_req *req = fuse_get_req(fc);
667 if (IS_ERR(req))
668 return PTR_ERR(req);
669
670 req->in.h.opcode = FUSE_RMDIR;
671 req->in.h.nodeid = get_node_id(dir);
672 req->in.numargs = 1;
673 req->in.args[0].size = entry->d_name.len + 1;
674 req->in.args[0].value = entry->d_name.name;
675 fuse_request_send(fc, req);
676 err = req->out.h.error;
677 fuse_put_request(fc, req);
678 if (!err) {
679 clear_nlink(entry->d_inode);
680 fuse_invalidate_attr(dir);
681 fuse_invalidate_entry_cache(entry);
682 } else if (err == -EINTR)
683 fuse_invalidate_entry(entry);
684 return err;
685 }
686
687 static int fuse_rename(struct inode *olddir, struct dentry *oldent,
688 struct inode *newdir, struct dentry *newent)
689 {
690 int err;
691 struct fuse_rename_in inarg;
692 struct fuse_conn *fc = get_fuse_conn(olddir);
693 struct fuse_req *req = fuse_get_req(fc);
694 if (IS_ERR(req))
695 return PTR_ERR(req);
696
697 memset(&inarg, 0, sizeof(inarg));
698 inarg.newdir = get_node_id(newdir);
699 req->in.h.opcode = FUSE_RENAME;
700 req->in.h.nodeid = get_node_id(olddir);
701 req->in.numargs = 3;
702 req->in.args[0].size = sizeof(inarg);
703 req->in.args[0].value = &inarg;
704 req->in.args[1].size = oldent->d_name.len + 1;
705 req->in.args[1].value = oldent->d_name.name;
706 req->in.args[2].size = newent->d_name.len + 1;
707 req->in.args[2].value = newent->d_name.name;
708 fuse_request_send(fc, req);
709 err = req->out.h.error;
710 fuse_put_request(fc, req);
711 if (!err) {
712 /* ctime changes */
713 fuse_invalidate_attr(oldent->d_inode);
714
715 fuse_invalidate_attr(olddir);
716 if (olddir != newdir)
717 fuse_invalidate_attr(newdir);
718
719 /* newent will end up negative */
720 if (newent->d_inode) {
721 fuse_invalidate_attr(newent->d_inode);
722 fuse_invalidate_entry_cache(newent);
723 }
724 } else if (err == -EINTR) {
725 /* If request was interrupted, DEITY only knows if the
726 rename actually took place. If the invalidation
727 fails (e.g. some process has CWD under the renamed
728 directory), then there can be inconsistency between
729 the dcache and the real filesystem. Tough luck. */
730 fuse_invalidate_entry(oldent);
731 if (newent->d_inode)
732 fuse_invalidate_entry(newent);
733 }
734
735 return err;
736 }
737
738 static int fuse_link(struct dentry *entry, struct inode *newdir,
739 struct dentry *newent)
740 {
741 int err;
742 struct fuse_link_in inarg;
743 struct inode *inode = entry->d_inode;
744 struct fuse_conn *fc = get_fuse_conn(inode);
745 struct fuse_req *req = fuse_get_req(fc);
746 if (IS_ERR(req))
747 return PTR_ERR(req);
748
749 memset(&inarg, 0, sizeof(inarg));
750 inarg.oldnodeid = get_node_id(inode);
751 req->in.h.opcode = FUSE_LINK;
752 req->in.numargs = 2;
753 req->in.args[0].size = sizeof(inarg);
754 req->in.args[0].value = &inarg;
755 req->in.args[1].size = newent->d_name.len + 1;
756 req->in.args[1].value = newent->d_name.name;
757 err = create_new_entry(fc, req, newdir, newent, inode->i_mode);
758 /* Contrary to "normal" filesystems it can happen that link
759 makes two "logical" inodes point to the same "physical"
760 inode. We invalidate the attributes of the old one, so it
761 will reflect changes in the backing inode (link count,
762 etc.)
763 */
764 if (!err || err == -EINTR)
765 fuse_invalidate_attr(inode);
766 return err;
767 }
768
769 static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr,
770 struct kstat *stat)
771 {
772 stat->dev = inode->i_sb->s_dev;
773 stat->ino = attr->ino;
774 stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
775 stat->nlink = attr->nlink;
776 stat->uid = attr->uid;
777 stat->gid = attr->gid;
778 stat->rdev = inode->i_rdev;
779 stat->atime.tv_sec = attr->atime;
780 stat->atime.tv_nsec = attr->atimensec;
781 stat->mtime.tv_sec = attr->mtime;
782 stat->mtime.tv_nsec = attr->mtimensec;
783 stat->ctime.tv_sec = attr->ctime;
784 stat->ctime.tv_nsec = attr->ctimensec;
785 stat->size = attr->size;
786 stat->blocks = attr->blocks;
787 stat->blksize = (1 << inode->i_blkbits);
788 }
789
790 static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
791 struct file *file)
792 {
793 int err;
794 struct fuse_getattr_in inarg;
795 struct fuse_attr_out outarg;
796 struct fuse_conn *fc = get_fuse_conn(inode);
797 struct fuse_req *req;
798 u64 attr_version;
799
800 req = fuse_get_req(fc);
801 if (IS_ERR(req))
802 return PTR_ERR(req);
803
804 attr_version = fuse_get_attr_version(fc);
805
806 memset(&inarg, 0, sizeof(inarg));
807 memset(&outarg, 0, sizeof(outarg));
808 /* Directories have separate file-handle space */
809 if (file && S_ISREG(inode->i_mode)) {
810 struct fuse_file *ff = file->private_data;
811
812 inarg.getattr_flags |= FUSE_GETATTR_FH;
813 inarg.fh = ff->fh;
814 }
815 req->in.h.opcode = FUSE_GETATTR;
816 req->in.h.nodeid = get_node_id(inode);
817 req->in.numargs = 1;
818 req->in.args[0].size = sizeof(inarg);
819 req->in.args[0].value = &inarg;
820 req->out.numargs = 1;
821 if (fc->minor < 9)
822 req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
823 else
824 req->out.args[0].size = sizeof(outarg);
825 req->out.args[0].value = &outarg;
826 fuse_request_send(fc, req);
827 err = req->out.h.error;
828 fuse_put_request(fc, req);
829 if (!err) {
830 if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
831 make_bad_inode(inode);
832 err = -EIO;
833 } else {
834 fuse_change_attributes(inode, &outarg.attr,
835 attr_timeout(&outarg),
836 attr_version);
837 if (stat)
838 fuse_fillattr(inode, &outarg.attr, stat);
839 }
840 }
841 return err;
842 }
843
844 int fuse_update_attributes(struct inode *inode, struct kstat *stat,
845 struct file *file, bool *refreshed)
846 {
847 struct fuse_inode *fi = get_fuse_inode(inode);
848 int err;
849 bool r;
850
851 if (fi->i_time < get_jiffies_64()) {
852 r = true;
853 err = fuse_do_getattr(inode, stat, file);
854 } else {
855 r = false;
856 err = 0;
857 if (stat) {
858 generic_fillattr(inode, stat);
859 stat->mode = fi->orig_i_mode;
860 }
861 }
862
863 if (refreshed != NULL)
864 *refreshed = r;
865
866 return err;
867 }
868
869 int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
870 struct qstr *name)
871 {
872 int err = -ENOTDIR;
873 struct inode *parent;
874 struct dentry *dir;
875 struct dentry *entry;
876
877 parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid);
878 if (!parent)
879 return -ENOENT;
880
881 mutex_lock(&parent->i_mutex);
882 if (!S_ISDIR(parent->i_mode))
883 goto unlock;
884
885 err = -ENOENT;
886 dir = d_find_alias(parent);
887 if (!dir)
888 goto unlock;
889
890 entry = d_lookup(dir, name);
891 dput(dir);
892 if (!entry)
893 goto unlock;
894
895 fuse_invalidate_attr(parent);
896 fuse_invalidate_entry(entry);
897 dput(entry);
898 err = 0;
899
900 unlock:
901 mutex_unlock(&parent->i_mutex);
902 iput(parent);
903 return err;
904 }
905
906 /*
907 * Calling into a user-controlled filesystem gives the filesystem
908 * daemon ptrace-like capabilities over the requester process. This
909 * means, that the filesystem daemon is able to record the exact
910 * filesystem operations performed, and can also control the behavior
911 * of the requester process in otherwise impossible ways. For example
912 * it can delay the operation for arbitrary length of time allowing
913 * DoS against the requester.
914 *
915 * For this reason only those processes can call into the filesystem,
916 * for which the owner of the mount has ptrace privilege. This
917 * excludes processes started by other users, suid or sgid processes.
918 */
919 int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task)
920 {
921 const struct cred *cred;
922 int ret;
923
924 if (fc->flags & FUSE_ALLOW_OTHER)
925 return 1;
926
927 rcu_read_lock();
928 ret = 0;
929 cred = __task_cred(task);
930 if (cred->euid == fc->user_id &&
931 cred->suid == fc->user_id &&
932 cred->uid == fc->user_id &&
933 cred->egid == fc->group_id &&
934 cred->sgid == fc->group_id &&
935 cred->gid == fc->group_id)
936 ret = 1;
937 rcu_read_unlock();
938
939 return ret;
940 }
941
942 static int fuse_access(struct inode *inode, int mask)
943 {
944 struct fuse_conn *fc = get_fuse_conn(inode);
945 struct fuse_req *req;
946 struct fuse_access_in inarg;
947 int err;
948
949 if (fc->no_access)
950 return 0;
951
952 req = fuse_get_req(fc);
953 if (IS_ERR(req))
954 return PTR_ERR(req);
955
956 memset(&inarg, 0, sizeof(inarg));
957 inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC);
958 req->in.h.opcode = FUSE_ACCESS;
959 req->in.h.nodeid = get_node_id(inode);
960 req->in.numargs = 1;
961 req->in.args[0].size = sizeof(inarg);
962 req->in.args[0].value = &inarg;
963 fuse_request_send(fc, req);
964 err = req->out.h.error;
965 fuse_put_request(fc, req);
966 if (err == -ENOSYS) {
967 fc->no_access = 1;
968 err = 0;
969 }
970 return err;
971 }
972
973 /*
974 * Check permission. The two basic access models of FUSE are:
975 *
976 * 1) Local access checking ('default_permissions' mount option) based
977 * on file mode. This is the plain old disk filesystem permission
978 * modell.
979 *
980 * 2) "Remote" access checking, where server is responsible for
981 * checking permission in each inode operation. An exception to this
982 * is if ->permission() was invoked from sys_access() in which case an
983 * access request is sent. Execute permission is still checked
984 * locally based on file mode.
985 */
986 static int fuse_permission(struct inode *inode, int mask, unsigned int flags)
987 {
988 struct fuse_conn *fc = get_fuse_conn(inode);
989 bool refreshed = false;
990 int err = 0;
991
992 if (flags & IPERM_FLAG_RCU)
993 return -ECHILD;
994
995 if (!fuse_allow_task(fc, current))
996 return -EACCES;
997
998 /*
999 * If attributes are needed, refresh them before proceeding
1000 */
1001 if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) ||
1002 ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) {
1003 err = fuse_update_attributes(inode, NULL, NULL, &refreshed);
1004 if (err)
1005 return err;
1006 }
1007
1008 if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
1009 err = generic_permission(inode, mask, flags, NULL);
1010
1011 /* If permission is denied, try to refresh file
1012 attributes. This is also needed, because the root
1013 node will at first have no permissions */
1014 if (err == -EACCES && !refreshed) {
1015 err = fuse_do_getattr(inode, NULL, NULL);
1016 if (!err)
1017 err = generic_permission(inode, mask,
1018 flags, NULL);
1019 }
1020
1021 /* Note: the opposite of the above test does not
1022 exist. So if permissions are revoked this won't be
1023 noticed immediately, only after the attribute
1024 timeout has expired */
1025 } else if (mask & (MAY_ACCESS | MAY_CHDIR)) {
1026 err = fuse_access(inode, mask);
1027 } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) {
1028 if (!(inode->i_mode & S_IXUGO)) {
1029 if (refreshed)
1030 return -EACCES;
1031
1032 err = fuse_do_getattr(inode, NULL, NULL);
1033 if (!err && !(inode->i_mode & S_IXUGO))
1034 return -EACCES;
1035 }
1036 }
1037 return err;
1038 }
1039
1040 static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
1041 void *dstbuf, filldir_t filldir)
1042 {
1043 while (nbytes >= FUSE_NAME_OFFSET) {
1044 struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
1045 size_t reclen = FUSE_DIRENT_SIZE(dirent);
1046 int over;
1047 if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
1048 return -EIO;
1049 if (reclen > nbytes)
1050 break;
1051
1052 over = filldir(dstbuf, dirent->name, dirent->namelen,
1053 file->f_pos, dirent->ino, dirent->type);
1054 if (over)
1055 break;
1056
1057 buf += reclen;
1058 nbytes -= reclen;
1059 file->f_pos = dirent->off;
1060 }
1061
1062 return 0;
1063 }
1064
1065 static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
1066 {
1067 int err;
1068 size_t nbytes;
1069 struct page *page;
1070 struct inode *inode = file->f_path.dentry->d_inode;
1071 struct fuse_conn *fc = get_fuse_conn(inode);
1072 struct fuse_req *req;
1073
1074 if (is_bad_inode(inode))
1075 return -EIO;
1076
1077 req = fuse_get_req(fc);
1078 if (IS_ERR(req))
1079 return PTR_ERR(req);
1080
1081 page = alloc_page(GFP_KERNEL);
1082 if (!page) {
1083 fuse_put_request(fc, req);
1084 return -ENOMEM;
1085 }
1086 req->out.argpages = 1;
1087 req->num_pages = 1;
1088 req->pages[0] = page;
1089 fuse_read_fill(req, file, file->f_pos, PAGE_SIZE, FUSE_READDIR);
1090 fuse_request_send(fc, req);
1091 nbytes = req->out.args[0].size;
1092 err = req->out.h.error;
1093 fuse_put_request(fc, req);
1094 if (!err)
1095 err = parse_dirfile(page_address(page), nbytes, file, dstbuf,
1096 filldir);
1097
1098 __free_page(page);
1099 fuse_invalidate_attr(inode); /* atime changed */
1100 return err;
1101 }
1102
1103 static char *read_link(struct dentry *dentry)
1104 {
1105 struct inode *inode = dentry->d_inode;
1106 struct fuse_conn *fc = get_fuse_conn(inode);
1107 struct fuse_req *req = fuse_get_req(fc);
1108 char *link;
1109
1110 if (IS_ERR(req))
1111 return ERR_CAST(req);
1112
1113 link = (char *) __get_free_page(GFP_KERNEL);
1114 if (!link) {
1115 link = ERR_PTR(-ENOMEM);
1116 goto out;
1117 }
1118 req->in.h.opcode = FUSE_READLINK;
1119 req->in.h.nodeid = get_node_id(inode);
1120 req->out.argvar = 1;
1121 req->out.numargs = 1;
1122 req->out.args[0].size = PAGE_SIZE - 1;
1123 req->out.args[0].value = link;
1124 fuse_request_send(fc, req);
1125 if (req->out.h.error) {
1126 free_page((unsigned long) link);
1127 link = ERR_PTR(req->out.h.error);
1128 } else
1129 link[req->out.args[0].size] = '\0';
1130 out:
1131 fuse_put_request(fc, req);
1132 fuse_invalidate_attr(inode); /* atime changed */
1133 return link;
1134 }
1135
1136 static void free_link(char *link)
1137 {
1138 if (!IS_ERR(link))
1139 free_page((unsigned long) link);
1140 }
1141
1142 static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd)
1143 {
1144 nd_set_link(nd, read_link(dentry));
1145 return NULL;
1146 }
1147
1148 static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c)
1149 {
1150 free_link(nd_get_link(nd));
1151 }
1152
1153 static int fuse_dir_open(struct inode *inode, struct file *file)
1154 {
1155 return fuse_open_common(inode, file, true);
1156 }
1157
1158 static int fuse_dir_release(struct inode *inode, struct file *file)
1159 {
1160 fuse_release_common(file, FUSE_RELEASEDIR);
1161
1162 return 0;
1163 }
1164
1165 static int fuse_dir_fsync(struct file *file, int datasync)
1166 {
1167 return fuse_fsync_common(file, datasync, 1);
1168 }
1169
1170 static bool update_mtime(unsigned ivalid)
1171 {
1172 /* Always update if mtime is explicitly set */
1173 if (ivalid & ATTR_MTIME_SET)
1174 return true;
1175
1176 /* If it's an open(O_TRUNC) or an ftruncate(), don't update */
1177 if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE)))
1178 return false;
1179
1180 /* In all other cases update */
1181 return true;
1182 }
1183
1184 static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg)
1185 {
1186 unsigned ivalid = iattr->ia_valid;
1187
1188 if (ivalid & ATTR_MODE)
1189 arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode;
1190 if (ivalid & ATTR_UID)
1191 arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid;
1192 if (ivalid & ATTR_GID)
1193 arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid;
1194 if (ivalid & ATTR_SIZE)
1195 arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size;
1196 if (ivalid & ATTR_ATIME) {
1197 arg->valid |= FATTR_ATIME;
1198 arg->atime = iattr->ia_atime.tv_sec;
1199 arg->atimensec = iattr->ia_atime.tv_nsec;
1200 if (!(ivalid & ATTR_ATIME_SET))
1201 arg->valid |= FATTR_ATIME_NOW;
1202 }
1203 if ((ivalid & ATTR_MTIME) && update_mtime(ivalid)) {
1204 arg->valid |= FATTR_MTIME;
1205 arg->mtime = iattr->ia_mtime.tv_sec;
1206 arg->mtimensec = iattr->ia_mtime.tv_nsec;
1207 if (!(ivalid & ATTR_MTIME_SET))
1208 arg->valid |= FATTR_MTIME_NOW;
1209 }
1210 }
1211
1212 /*
1213 * Prevent concurrent writepages on inode
1214 *
1215 * This is done by adding a negative bias to the inode write counter
1216 * and waiting for all pending writes to finish.
1217 */
1218 void fuse_set_nowrite(struct inode *inode)
1219 {
1220 struct fuse_conn *fc = get_fuse_conn(inode);
1221 struct fuse_inode *fi = get_fuse_inode(inode);
1222
1223 BUG_ON(!mutex_is_locked(&inode->i_mutex));
1224
1225 spin_lock(&fc->lock);
1226 BUG_ON(fi->writectr < 0);
1227 fi->writectr += FUSE_NOWRITE;
1228 spin_unlock(&fc->lock);
1229 wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE);
1230 }
1231
1232 /*
1233 * Allow writepages on inode
1234 *
1235 * Remove the bias from the writecounter and send any queued
1236 * writepages.
1237 */
1238 static void __fuse_release_nowrite(struct inode *inode)
1239 {
1240 struct fuse_inode *fi = get_fuse_inode(inode);
1241
1242 BUG_ON(fi->writectr != FUSE_NOWRITE);
1243 fi->writectr = 0;
1244 fuse_flush_writepages(inode);
1245 }
1246
1247 void fuse_release_nowrite(struct inode *inode)
1248 {
1249 struct fuse_conn *fc = get_fuse_conn(inode);
1250
1251 spin_lock(&fc->lock);
1252 __fuse_release_nowrite(inode);
1253 spin_unlock(&fc->lock);
1254 }
1255
1256 /*
1257 * Set attributes, and at the same time refresh them.
1258 *
1259 * Truncation is slightly complicated, because the 'truncate' request
1260 * may fail, in which case we don't want to touch the mapping.
1261 * vmtruncate() doesn't allow for this case, so do the rlimit checking
1262 * and the actual truncation by hand.
1263 */
1264 static int fuse_do_setattr(struct dentry *entry, struct iattr *attr,
1265 struct file *file)
1266 {
1267 struct inode *inode = entry->d_inode;
1268 struct fuse_conn *fc = get_fuse_conn(inode);
1269 struct fuse_req *req;
1270 struct fuse_setattr_in inarg;
1271 struct fuse_attr_out outarg;
1272 bool is_truncate = false;
1273 loff_t oldsize;
1274 int err;
1275
1276 if (!fuse_allow_task(fc, current))
1277 return -EACCES;
1278
1279 if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
1280 attr->ia_valid |= ATTR_FORCE;
1281
1282 err = inode_change_ok(inode, attr);
1283 if (err)
1284 return err;
1285
1286 if ((attr->ia_valid & ATTR_OPEN) && fc->atomic_o_trunc)
1287 return 0;
1288
1289 if (attr->ia_valid & ATTR_SIZE)
1290 is_truncate = true;
1291
1292 req = fuse_get_req(fc);
1293 if (IS_ERR(req))
1294 return PTR_ERR(req);
1295
1296 if (is_truncate)
1297 fuse_set_nowrite(inode);
1298
1299 memset(&inarg, 0, sizeof(inarg));
1300 memset(&outarg, 0, sizeof(outarg));
1301 iattr_to_fattr(attr, &inarg);
1302 if (file) {
1303 struct fuse_file *ff = file->private_data;
1304 inarg.valid |= FATTR_FH;
1305 inarg.fh = ff->fh;
1306 }
1307 if (attr->ia_valid & ATTR_SIZE) {
1308 /* For mandatory locking in truncate */
1309 inarg.valid |= FATTR_LOCKOWNER;
1310 inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
1311 }
1312 req->in.h.opcode = FUSE_SETATTR;
1313 req->in.h.nodeid = get_node_id(inode);
1314 req->in.numargs = 1;
1315 req->in.args[0].size = sizeof(inarg);
1316 req->in.args[0].value = &inarg;
1317 req->out.numargs = 1;
1318 if (fc->minor < 9)
1319 req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
1320 else
1321 req->out.args[0].size = sizeof(outarg);
1322 req->out.args[0].value = &outarg;
1323 fuse_request_send(fc, req);
1324 err = req->out.h.error;
1325 fuse_put_request(fc, req);
1326 if (err) {
1327 if (err == -EINTR)
1328 fuse_invalidate_attr(inode);
1329 goto error;
1330 }
1331
1332 if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
1333 make_bad_inode(inode);
1334 err = -EIO;
1335 goto error;
1336 }
1337
1338 spin_lock(&fc->lock);
1339 fuse_change_attributes_common(inode, &outarg.attr,
1340 attr_timeout(&outarg));
1341 oldsize = inode->i_size;
1342 i_size_write(inode, outarg.attr.size);
1343
1344 if (is_truncate) {
1345 /* NOTE: this may release/reacquire fc->lock */
1346 __fuse_release_nowrite(inode);
1347 }
1348 spin_unlock(&fc->lock);
1349
1350 /*
1351 * Only call invalidate_inode_pages2() after removing
1352 * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
1353 */
1354 if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
1355 truncate_pagecache(inode, oldsize, outarg.attr.size);
1356 invalidate_inode_pages2(inode->i_mapping);
1357 }
1358
1359 return 0;
1360
1361 error:
1362 if (is_truncate)
1363 fuse_release_nowrite(inode);
1364
1365 return err;
1366 }
1367
1368 static int fuse_setattr(struct dentry *entry, struct iattr *attr)
1369 {
1370 if (attr->ia_valid & ATTR_FILE)
1371 return fuse_do_setattr(entry, attr, attr->ia_file);
1372 else
1373 return fuse_do_setattr(entry, attr, NULL);
1374 }
1375
1376 static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
1377 struct kstat *stat)
1378 {
1379 struct inode *inode = entry->d_inode;
1380 struct fuse_conn *fc = get_fuse_conn(inode);
1381
1382 if (!fuse_allow_task(fc, current))
1383 return -EACCES;
1384
1385 return fuse_update_attributes(inode, stat, NULL, NULL);
1386 }
1387
1388 static int fuse_setxattr(struct dentry *entry, const char *name,
1389 const void *value, size_t size, int flags)
1390 {
1391 struct inode *inode = entry->d_inode;
1392 struct fuse_conn *fc = get_fuse_conn(inode);
1393 struct fuse_req *req;
1394 struct fuse_setxattr_in inarg;
1395 int err;
1396
1397 if (fc->no_setxattr)
1398 return -EOPNOTSUPP;
1399
1400 req = fuse_get_req(fc);
1401 if (IS_ERR(req))
1402 return PTR_ERR(req);
1403
1404 memset(&inarg, 0, sizeof(inarg));
1405 inarg.size = size;
1406 inarg.flags = flags;
1407 req->in.h.opcode = FUSE_SETXATTR;
1408 req->in.h.nodeid = get_node_id(inode);
1409 req->in.numargs = 3;
1410 req->in.args[0].size = sizeof(inarg);
1411 req->in.args[0].value = &inarg;
1412 req->in.args[1].size = strlen(name) + 1;
1413 req->in.args[1].value = name;
1414 req->in.args[2].size = size;
1415 req->in.args[2].value = value;
1416 fuse_request_send(fc, req);
1417 err = req->out.h.error;
1418 fuse_put_request(fc, req);
1419 if (err == -ENOSYS) {
1420 fc->no_setxattr = 1;
1421 err = -EOPNOTSUPP;
1422 }
1423 return err;
1424 }
1425
1426 static ssize_t fuse_getxattr(struct dentry *entry, const char *name,
1427 void *value, size_t size)
1428 {
1429 struct inode *inode = entry->d_inode;
1430 struct fuse_conn *fc = get_fuse_conn(inode);
1431 struct fuse_req *req;
1432 struct fuse_getxattr_in inarg;
1433 struct fuse_getxattr_out outarg;
1434 ssize_t ret;
1435
1436 if (fc->no_getxattr)
1437 return -EOPNOTSUPP;
1438
1439 req = fuse_get_req(fc);
1440 if (IS_ERR(req))
1441 return PTR_ERR(req);
1442
1443 memset(&inarg, 0, sizeof(inarg));
1444 inarg.size = size;
1445 req->in.h.opcode = FUSE_GETXATTR;
1446 req->in.h.nodeid = get_node_id(inode);
1447 req->in.numargs = 2;
1448 req->in.args[0].size = sizeof(inarg);
1449 req->in.args[0].value = &inarg;
1450 req->in.args[1].size = strlen(name) + 1;
1451 req->in.args[1].value = name;
1452 /* This is really two different operations rolled into one */
1453 req->out.numargs = 1;
1454 if (size) {
1455 req->out.argvar = 1;
1456 req->out.args[0].size = size;
1457 req->out.args[0].value = value;
1458 } else {
1459 req->out.args[0].size = sizeof(outarg);
1460 req->out.args[0].value = &outarg;
1461 }
1462 fuse_request_send(fc, req);
1463 ret = req->out.h.error;
1464 if (!ret)
1465 ret = size ? req->out.args[0].size : outarg.size;
1466 else {
1467 if (ret == -ENOSYS) {
1468 fc->no_getxattr = 1;
1469 ret = -EOPNOTSUPP;
1470 }
1471 }
1472 fuse_put_request(fc, req);
1473 return ret;
1474 }
1475
1476 static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
1477 {
1478 struct inode *inode = entry->d_inode;
1479 struct fuse_conn *fc = get_fuse_conn(inode);
1480 struct fuse_req *req;
1481 struct fuse_getxattr_in inarg;
1482 struct fuse_getxattr_out outarg;
1483 ssize_t ret;
1484
1485 if (!fuse_allow_task(fc, current))
1486 return -EACCES;
1487
1488 if (fc->no_listxattr)
1489 return -EOPNOTSUPP;
1490
1491 req = fuse_get_req(fc);
1492 if (IS_ERR(req))
1493 return PTR_ERR(req);
1494
1495 memset(&inarg, 0, sizeof(inarg));
1496 inarg.size = size;
1497 req->in.h.opcode = FUSE_LISTXATTR;
1498 req->in.h.nodeid = get_node_id(inode);
1499 req->in.numargs = 1;
1500 req->in.args[0].size = sizeof(inarg);
1501 req->in.args[0].value = &inarg;
1502 /* This is really two different operations rolled into one */
1503 req->out.numargs = 1;
1504 if (size) {
1505 req->out.argvar = 1;
1506 req->out.args[0].size = size;
1507 req->out.args[0].value = list;
1508 } else {
1509 req->out.args[0].size = sizeof(outarg);
1510 req->out.args[0].value = &outarg;
1511 }
1512 fuse_request_send(fc, req);
1513 ret = req->out.h.error;
1514 if (!ret)
1515 ret = size ? req->out.args[0].size : outarg.size;
1516 else {
1517 if (ret == -ENOSYS) {
1518 fc->no_listxattr = 1;
1519 ret = -EOPNOTSUPP;
1520 }
1521 }
1522 fuse_put_request(fc, req);
1523 return ret;
1524 }
1525
1526 static int fuse_removexattr(struct dentry *entry, const char *name)
1527 {
1528 struct inode *inode = entry->d_inode;
1529 struct fuse_conn *fc = get_fuse_conn(inode);
1530 struct fuse_req *req;
1531 int err;
1532
1533 if (fc->no_removexattr)
1534 return -EOPNOTSUPP;
1535
1536 req = fuse_get_req(fc);
1537 if (IS_ERR(req))
1538 return PTR_ERR(req);
1539
1540 req->in.h.opcode = FUSE_REMOVEXATTR;
1541 req->in.h.nodeid = get_node_id(inode);
1542 req->in.numargs = 1;
1543 req->in.args[0].size = strlen(name) + 1;
1544 req->in.args[0].value = name;
1545 fuse_request_send(fc, req);
1546 err = req->out.h.error;
1547 fuse_put_request(fc, req);
1548 if (err == -ENOSYS) {
1549 fc->no_removexattr = 1;
1550 err = -EOPNOTSUPP;
1551 }
1552 return err;
1553 }
1554
1555 static const struct inode_operations fuse_dir_inode_operations = {
1556 .lookup = fuse_lookup,
1557 .mkdir = fuse_mkdir,
1558 .symlink = fuse_symlink,
1559 .unlink = fuse_unlink,
1560 .rmdir = fuse_rmdir,
1561 .rename = fuse_rename,
1562 .link = fuse_link,
1563 .setattr = fuse_setattr,
1564 .create = fuse_create,
1565 .mknod = fuse_mknod,
1566 .permission = fuse_permission,
1567 .getattr = fuse_getattr,
1568 .setxattr = fuse_setxattr,
1569 .getxattr = fuse_getxattr,
1570 .listxattr = fuse_listxattr,
1571 .removexattr = fuse_removexattr,
1572 };
1573
1574 static const struct file_operations fuse_dir_operations = {
1575 .llseek = generic_file_llseek,
1576 .read = generic_read_dir,
1577 .readdir = fuse_readdir,
1578 .open = fuse_dir_open,
1579 .release = fuse_dir_release,
1580 .fsync = fuse_dir_fsync,
1581 };
1582
1583 static const struct inode_operations fuse_common_inode_operations = {
1584 .setattr = fuse_setattr,
1585 .permission = fuse_permission,
1586 .getattr = fuse_getattr,
1587 .setxattr = fuse_setxattr,
1588 .getxattr = fuse_getxattr,
1589 .listxattr = fuse_listxattr,
1590 .removexattr = fuse_removexattr,
1591 };
1592
1593 static const struct inode_operations fuse_symlink_inode_operations = {
1594 .setattr = fuse_setattr,
1595 .follow_link = fuse_follow_link,
1596 .put_link = fuse_put_link,
1597 .readlink = generic_readlink,
1598 .getattr = fuse_getattr,
1599 .setxattr = fuse_setxattr,
1600 .getxattr = fuse_getxattr,
1601 .listxattr = fuse_listxattr,
1602 .removexattr = fuse_removexattr,
1603 };
1604
1605 void fuse_init_common(struct inode *inode)
1606 {
1607 inode->i_op = &fuse_common_inode_operations;
1608 }
1609
1610 void fuse_init_dir(struct inode *inode)
1611 {
1612 inode->i_op = &fuse_dir_inode_operations;
1613 inode->i_fop = &fuse_dir_operations;
1614 }
1615
1616 void fuse_init_symlink(struct inode *inode)
1617 {
1618 inode->i_op = &fuse_symlink_inode_operations;
1619 }
CRIS linux kernel tree