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Merge branch 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / fuse / dir.c
blob0d0e3faddcfa0bbd9ddac898d9e7caa0fc2b57bf
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 inode = ACCESS_ONCE(entry->d_inode);
162 if (inode && is_bad_inode(inode))
163 return 0;
164 else if (fuse_dentry_time(entry) < get_jiffies_64()) {
165 int err;
166 struct fuse_entry_out outarg;
167 struct fuse_conn *fc;
168 struct fuse_req *req;
169 struct fuse_forget_link *forget;
170 struct dentry *parent;
171 u64 attr_version;
172
173 /* For negative dentries, always do a fresh lookup */
174 if (!inode)
175 return 0;
176
177 if (nd && (nd->flags & LOOKUP_RCU))
178 return -ECHILD;
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 dentry_unhash(entry);
671
672 req->in.h.opcode = FUSE_RMDIR;
673 req->in.h.nodeid = get_node_id(dir);
674 req->in.numargs = 1;
675 req->in.args[0].size = entry->d_name.len + 1;
676 req->in.args[0].value = entry->d_name.name;
677 fuse_request_send(fc, req);
678 err = req->out.h.error;
679 fuse_put_request(fc, req);
680 if (!err) {
681 clear_nlink(entry->d_inode);
682 fuse_invalidate_attr(dir);
683 fuse_invalidate_entry_cache(entry);
684 } else if (err == -EINTR)
685 fuse_invalidate_entry(entry);
686 return err;
687 }
688
689 static int fuse_rename(struct inode *olddir, struct dentry *oldent,
690 struct inode *newdir, struct dentry *newent)
691 {
692 int err;
693 struct fuse_rename_in inarg;
694 struct fuse_conn *fc = get_fuse_conn(olddir);
695 struct fuse_req *req = fuse_get_req(fc);
696
697 if (newent->d_inode && S_ISDIR(newent->d_inode->i_mode))
698 dentry_unhash(newent);
699
700 if (IS_ERR(req))
701 return PTR_ERR(req);
702
703 memset(&inarg, 0, sizeof(inarg));
704 inarg.newdir = get_node_id(newdir);
705 req->in.h.opcode = FUSE_RENAME;
706 req->in.h.nodeid = get_node_id(olddir);
707 req->in.numargs = 3;
708 req->in.args[0].size = sizeof(inarg);
709 req->in.args[0].value = &inarg;
710 req->in.args[1].size = oldent->d_name.len + 1;
711 req->in.args[1].value = oldent->d_name.name;
712 req->in.args[2].size = newent->d_name.len + 1;
713 req->in.args[2].value = newent->d_name.name;
714 fuse_request_send(fc, req);
715 err = req->out.h.error;
716 fuse_put_request(fc, req);
717 if (!err) {
718 /* ctime changes */
719 fuse_invalidate_attr(oldent->d_inode);
720
721 fuse_invalidate_attr(olddir);
722 if (olddir != newdir)
723 fuse_invalidate_attr(newdir);
724
725 /* newent will end up negative */
726 if (newent->d_inode) {
727 fuse_invalidate_attr(newent->d_inode);
728 fuse_invalidate_entry_cache(newent);
729 }
730 } else if (err == -EINTR) {
731 /* If request was interrupted, DEITY only knows if the
732 rename actually took place. If the invalidation
733 fails (e.g. some process has CWD under the renamed
734 directory), then there can be inconsistency between
735 the dcache and the real filesystem. Tough luck. */
736 fuse_invalidate_entry(oldent);
737 if (newent->d_inode)
738 fuse_invalidate_entry(newent);
739 }
740
741 return err;
742 }
743
744 static int fuse_link(struct dentry *entry, struct inode *newdir,
745 struct dentry *newent)
746 {
747 int err;
748 struct fuse_link_in inarg;
749 struct inode *inode = entry->d_inode;
750 struct fuse_conn *fc = get_fuse_conn(inode);
751 struct fuse_req *req = fuse_get_req(fc);
752 if (IS_ERR(req))
753 return PTR_ERR(req);
754
755 memset(&inarg, 0, sizeof(inarg));
756 inarg.oldnodeid = get_node_id(inode);
757 req->in.h.opcode = FUSE_LINK;
758 req->in.numargs = 2;
759 req->in.args[0].size = sizeof(inarg);
760 req->in.args[0].value = &inarg;
761 req->in.args[1].size = newent->d_name.len + 1;
762 req->in.args[1].value = newent->d_name.name;
763 err = create_new_entry(fc, req, newdir, newent, inode->i_mode);
764 /* Contrary to "normal" filesystems it can happen that link
765 makes two "logical" inodes point to the same "physical"
766 inode. We invalidate the attributes of the old one, so it
767 will reflect changes in the backing inode (link count,
768 etc.)
769 */
770 if (!err || err == -EINTR)
771 fuse_invalidate_attr(inode);
772 return err;
773 }
774
775 static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr,
776 struct kstat *stat)
777 {
778 stat->dev = inode->i_sb->s_dev;
779 stat->ino = attr->ino;
780 stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
781 stat->nlink = attr->nlink;
782 stat->uid = attr->uid;
783 stat->gid = attr->gid;
784 stat->rdev = inode->i_rdev;
785 stat->atime.tv_sec = attr->atime;
786 stat->atime.tv_nsec = attr->atimensec;
787 stat->mtime.tv_sec = attr->mtime;
788 stat->mtime.tv_nsec = attr->mtimensec;
789 stat->ctime.tv_sec = attr->ctime;
790 stat->ctime.tv_nsec = attr->ctimensec;
791 stat->size = attr->size;
792 stat->blocks = attr->blocks;
793 stat->blksize = (1 << inode->i_blkbits);
794 }
795
796 static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
797 struct file *file)
798 {
799 int err;
800 struct fuse_getattr_in inarg;
801 struct fuse_attr_out outarg;
802 struct fuse_conn *fc = get_fuse_conn(inode);
803 struct fuse_req *req;
804 u64 attr_version;
805
806 req = fuse_get_req(fc);
807 if (IS_ERR(req))
808 return PTR_ERR(req);
809
810 attr_version = fuse_get_attr_version(fc);
811
812 memset(&inarg, 0, sizeof(inarg));
813 memset(&outarg, 0, sizeof(outarg));
814 /* Directories have separate file-handle space */
815 if (file && S_ISREG(inode->i_mode)) {
816 struct fuse_file *ff = file->private_data;
817
818 inarg.getattr_flags |= FUSE_GETATTR_FH;
819 inarg.fh = ff->fh;
820 }
821 req->in.h.opcode = FUSE_GETATTR;
822 req->in.h.nodeid = get_node_id(inode);
823 req->in.numargs = 1;
824 req->in.args[0].size = sizeof(inarg);
825 req->in.args[0].value = &inarg;
826 req->out.numargs = 1;
827 if (fc->minor < 9)
828 req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
829 else
830 req->out.args[0].size = sizeof(outarg);
831 req->out.args[0].value = &outarg;
832 fuse_request_send(fc, req);
833 err = req->out.h.error;
834 fuse_put_request(fc, req);
835 if (!err) {
836 if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
837 make_bad_inode(inode);
838 err = -EIO;
839 } else {
840 fuse_change_attributes(inode, &outarg.attr,
841 attr_timeout(&outarg),
842 attr_version);
843 if (stat)
844 fuse_fillattr(inode, &outarg.attr, stat);
845 }
846 }
847 return err;
848 }
849
850 int fuse_update_attributes(struct inode *inode, struct kstat *stat,
851 struct file *file, bool *refreshed)
852 {
853 struct fuse_inode *fi = get_fuse_inode(inode);
854 int err;
855 bool r;
856
857 if (fi->i_time < get_jiffies_64()) {
858 r = true;
859 err = fuse_do_getattr(inode, stat, file);
860 } else {
861 r = false;
862 err = 0;
863 if (stat) {
864 generic_fillattr(inode, stat);
865 stat->mode = fi->orig_i_mode;
866 }
867 }
868
869 if (refreshed != NULL)
870 *refreshed = r;
871
872 return err;
873 }
874
875 int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
876 struct qstr *name)
877 {
878 int err = -ENOTDIR;
879 struct inode *parent;
880 struct dentry *dir;
881 struct dentry *entry;
882
883 parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid);
884 if (!parent)
885 return -ENOENT;
886
887 mutex_lock(&parent->i_mutex);
888 if (!S_ISDIR(parent->i_mode))
889 goto unlock;
890
891 err = -ENOENT;
892 dir = d_find_alias(parent);
893 if (!dir)
894 goto unlock;
895
896 entry = d_lookup(dir, name);
897 dput(dir);
898 if (!entry)
899 goto unlock;
900
901 fuse_invalidate_attr(parent);
902 fuse_invalidate_entry(entry);
903 dput(entry);
904 err = 0;
905
906 unlock:
907 mutex_unlock(&parent->i_mutex);
908 iput(parent);
909 return err;
910 }
911
912 /*
913 * Calling into a user-controlled filesystem gives the filesystem
914 * daemon ptrace-like capabilities over the requester process. This
915 * means, that the filesystem daemon is able to record the exact
916 * filesystem operations performed, and can also control the behavior
917 * of the requester process in otherwise impossible ways. For example
918 * it can delay the operation for arbitrary length of time allowing
919 * DoS against the requester.
920 *
921 * For this reason only those processes can call into the filesystem,
922 * for which the owner of the mount has ptrace privilege. This
923 * excludes processes started by other users, suid or sgid processes.
924 */
925 int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task)
926 {
927 const struct cred *cred;
928 int ret;
929
930 if (fc->flags & FUSE_ALLOW_OTHER)
931 return 1;
932
933 rcu_read_lock();
934 ret = 0;
935 cred = __task_cred(task);
936 if (cred->euid == fc->user_id &&
937 cred->suid == fc->user_id &&
938 cred->uid == fc->user_id &&
939 cred->egid == fc->group_id &&
940 cred->sgid == fc->group_id &&
941 cred->gid == fc->group_id)
942 ret = 1;
943 rcu_read_unlock();
944
945 return ret;
946 }
947
948 static int fuse_access(struct inode *inode, int mask)
949 {
950 struct fuse_conn *fc = get_fuse_conn(inode);
951 struct fuse_req *req;
952 struct fuse_access_in inarg;
953 int err;
954
955 if (fc->no_access)
956 return 0;
957
958 req = fuse_get_req(fc);
959 if (IS_ERR(req))
960 return PTR_ERR(req);
961
962 memset(&inarg, 0, sizeof(inarg));
963 inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC);
964 req->in.h.opcode = FUSE_ACCESS;
965 req->in.h.nodeid = get_node_id(inode);
966 req->in.numargs = 1;
967 req->in.args[0].size = sizeof(inarg);
968 req->in.args[0].value = &inarg;
969 fuse_request_send(fc, req);
970 err = req->out.h.error;
971 fuse_put_request(fc, req);
972 if (err == -ENOSYS) {
973 fc->no_access = 1;
974 err = 0;
975 }
976 return err;
977 }
978
979 static int fuse_perm_getattr(struct inode *inode, int flags)
980 {
981 if (flags & IPERM_FLAG_RCU)
982 return -ECHILD;
983
984 return fuse_do_getattr(inode, NULL, NULL);
985 }
986
987 /*
988 * Check permission. The two basic access models of FUSE are:
989 *
990 * 1) Local access checking ('default_permissions' mount option) based
991 * on file mode. This is the plain old disk filesystem permission
992 * modell.
993 *
994 * 2) "Remote" access checking, where server is responsible for
995 * checking permission in each inode operation. An exception to this
996 * is if ->permission() was invoked from sys_access() in which case an
997 * access request is sent. Execute permission is still checked
998 * locally based on file mode.
999 */
1000 static int fuse_permission(struct inode *inode, int mask, unsigned int flags)
1001 {
1002 struct fuse_conn *fc = get_fuse_conn(inode);
1003 bool refreshed = false;
1004 int err = 0;
1005
1006 if (!fuse_allow_task(fc, current))
1007 return -EACCES;
1008
1009 /*
1010 * If attributes are needed, refresh them before proceeding
1011 */
1012 if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) ||
1013 ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) {
1014 struct fuse_inode *fi = get_fuse_inode(inode);
1015
1016 if (fi->i_time < get_jiffies_64()) {
1017 refreshed = true;
1018
1019 err = fuse_perm_getattr(inode, flags);
1020 if (err)
1021 return err;
1022 }
1023 }
1024
1025 if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
1026 err = generic_permission(inode, mask, flags, NULL);
1027
1028 /* If permission is denied, try to refresh file
1029 attributes. This is also needed, because the root
1030 node will at first have no permissions */
1031 if (err == -EACCES && !refreshed) {
1032 err = fuse_perm_getattr(inode, flags);
1033 if (!err)
1034 err = generic_permission(inode, mask,
1035 flags, NULL);
1036 }
1037
1038 /* Note: the opposite of the above test does not
1039 exist. So if permissions are revoked this won't be
1040 noticed immediately, only after the attribute
1041 timeout has expired */
1042 } else if (mask & (MAY_ACCESS | MAY_CHDIR)) {
1043 if (flags & IPERM_FLAG_RCU)
1044 return -ECHILD;
1045
1046 err = fuse_access(inode, mask);
1047 } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) {
1048 if (!(inode->i_mode & S_IXUGO)) {
1049 if (refreshed)
1050 return -EACCES;
1051
1052 err = fuse_perm_getattr(inode, flags);
1053 if (!err && !(inode->i_mode & S_IXUGO))
1054 return -EACCES;
1055 }
1056 }
1057 return err;
1058 }
1059
1060 static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
1061 void *dstbuf, filldir_t filldir)
1062 {
1063 while (nbytes >= FUSE_NAME_OFFSET) {
1064 struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
1065 size_t reclen = FUSE_DIRENT_SIZE(dirent);
1066 int over;
1067 if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
1068 return -EIO;
1069 if (reclen > nbytes)
1070 break;
1071
1072 over = filldir(dstbuf, dirent->name, dirent->namelen,
1073 file->f_pos, dirent->ino, dirent->type);
1074 if (over)
1075 break;
1076
1077 buf += reclen;
1078 nbytes -= reclen;
1079 file->f_pos = dirent->off;
1080 }
1081
1082 return 0;
1083 }
1084
1085 static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
1086 {
1087 int err;
1088 size_t nbytes;
1089 struct page *page;
1090 struct inode *inode = file->f_path.dentry->d_inode;
1091 struct fuse_conn *fc = get_fuse_conn(inode);
1092 struct fuse_req *req;
1093
1094 if (is_bad_inode(inode))
1095 return -EIO;
1096
1097 req = fuse_get_req(fc);
1098 if (IS_ERR(req))
1099 return PTR_ERR(req);
1100
1101 page = alloc_page(GFP_KERNEL);
1102 if (!page) {
1103 fuse_put_request(fc, req);
1104 return -ENOMEM;
1105 }
1106 req->out.argpages = 1;
1107 req->num_pages = 1;
1108 req->pages[0] = page;
1109 fuse_read_fill(req, file, file->f_pos, PAGE_SIZE, FUSE_READDIR);
1110 fuse_request_send(fc, req);
1111 nbytes = req->out.args[0].size;
1112 err = req->out.h.error;
1113 fuse_put_request(fc, req);
1114 if (!err)
1115 err = parse_dirfile(page_address(page), nbytes, file, dstbuf,
1116 filldir);
1117
1118 __free_page(page);
1119 fuse_invalidate_attr(inode); /* atime changed */
1120 return err;
1121 }
1122
1123 static char *read_link(struct dentry *dentry)
1124 {
1125 struct inode *inode = dentry->d_inode;
1126 struct fuse_conn *fc = get_fuse_conn(inode);
1127 struct fuse_req *req = fuse_get_req(fc);
1128 char *link;
1129
1130 if (IS_ERR(req))
1131 return ERR_CAST(req);
1132
1133 link = (char *) __get_free_page(GFP_KERNEL);
1134 if (!link) {
1135 link = ERR_PTR(-ENOMEM);
1136 goto out;
1137 }
1138 req->in.h.opcode = FUSE_READLINK;
1139 req->in.h.nodeid = get_node_id(inode);
1140 req->out.argvar = 1;
1141 req->out.numargs = 1;
1142 req->out.args[0].size = PAGE_SIZE - 1;
1143 req->out.args[0].value = link;
1144 fuse_request_send(fc, req);
1145 if (req->out.h.error) {
1146 free_page((unsigned long) link);
1147 link = ERR_PTR(req->out.h.error);
1148 } else
1149 link[req->out.args[0].size] = '\0';
1150 out:
1151 fuse_put_request(fc, req);
1152 fuse_invalidate_attr(inode); /* atime changed */
1153 return link;
1154 }
1155
1156 static void free_link(char *link)
1157 {
1158 if (!IS_ERR(link))
1159 free_page((unsigned long) link);
1160 }
1161
1162 static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd)
1163 {
1164 nd_set_link(nd, read_link(dentry));
1165 return NULL;
1166 }
1167
1168 static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c)
1169 {
1170 free_link(nd_get_link(nd));
1171 }
1172
1173 static int fuse_dir_open(struct inode *inode, struct file *file)
1174 {
1175 return fuse_open_common(inode, file, true);
1176 }
1177
1178 static int fuse_dir_release(struct inode *inode, struct file *file)
1179 {
1180 fuse_release_common(file, FUSE_RELEASEDIR);
1181
1182 return 0;
1183 }
1184
1185 static int fuse_dir_fsync(struct file *file, int datasync)
1186 {
1187 return fuse_fsync_common(file, datasync, 1);
1188 }
1189
1190 static bool update_mtime(unsigned ivalid)
1191 {
1192 /* Always update if mtime is explicitly set */
1193 if (ivalid & ATTR_MTIME_SET)
1194 return true;
1195
1196 /* If it's an open(O_TRUNC) or an ftruncate(), don't update */
1197 if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE)))
1198 return false;
1199
1200 /* In all other cases update */
1201 return true;
1202 }
1203
1204 static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg)
1205 {
1206 unsigned ivalid = iattr->ia_valid;
1207
1208 if (ivalid & ATTR_MODE)
1209 arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode;
1210 if (ivalid & ATTR_UID)
1211 arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid;
1212 if (ivalid & ATTR_GID)
1213 arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid;
1214 if (ivalid & ATTR_SIZE)
1215 arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size;
1216 if (ivalid & ATTR_ATIME) {
1217 arg->valid |= FATTR_ATIME;
1218 arg->atime = iattr->ia_atime.tv_sec;
1219 arg->atimensec = iattr->ia_atime.tv_nsec;
1220 if (!(ivalid & ATTR_ATIME_SET))
1221 arg->valid |= FATTR_ATIME_NOW;
1222 }
1223 if ((ivalid & ATTR_MTIME) && update_mtime(ivalid)) {
1224 arg->valid |= FATTR_MTIME;
1225 arg->mtime = iattr->ia_mtime.tv_sec;
1226 arg->mtimensec = iattr->ia_mtime.tv_nsec;
1227 if (!(ivalid & ATTR_MTIME_SET))
1228 arg->valid |= FATTR_MTIME_NOW;
1229 }
1230 }
1231
1232 /*
1233 * Prevent concurrent writepages on inode
1234 *
1235 * This is done by adding a negative bias to the inode write counter
1236 * and waiting for all pending writes to finish.
1237 */
1238 void fuse_set_nowrite(struct inode *inode)
1239 {
1240 struct fuse_conn *fc = get_fuse_conn(inode);
1241 struct fuse_inode *fi = get_fuse_inode(inode);
1242
1243 BUG_ON(!mutex_is_locked(&inode->i_mutex));
1244
1245 spin_lock(&fc->lock);
1246 BUG_ON(fi->writectr < 0);
1247 fi->writectr += FUSE_NOWRITE;
1248 spin_unlock(&fc->lock);
1249 wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE);
1250 }
1251
1252 /*
1253 * Allow writepages on inode
1254 *
1255 * Remove the bias from the writecounter and send any queued
1256 * writepages.
1257 */
1258 static void __fuse_release_nowrite(struct inode *inode)
1259 {
1260 struct fuse_inode *fi = get_fuse_inode(inode);
1261
1262 BUG_ON(fi->writectr != FUSE_NOWRITE);
1263 fi->writectr = 0;
1264 fuse_flush_writepages(inode);
1265 }
1266
1267 void fuse_release_nowrite(struct inode *inode)
1268 {
1269 struct fuse_conn *fc = get_fuse_conn(inode);
1270
1271 spin_lock(&fc->lock);
1272 __fuse_release_nowrite(inode);
1273 spin_unlock(&fc->lock);
1274 }
1275
1276 /*
1277 * Set attributes, and at the same time refresh them.
1278 *
1279 * Truncation is slightly complicated, because the 'truncate' request
1280 * may fail, in which case we don't want to touch the mapping.
1281 * vmtruncate() doesn't allow for this case, so do the rlimit checking
1282 * and the actual truncation by hand.
1283 */
1284 static int fuse_do_setattr(struct dentry *entry, struct iattr *attr,
1285 struct file *file)
1286 {
1287 struct inode *inode = entry->d_inode;
1288 struct fuse_conn *fc = get_fuse_conn(inode);
1289 struct fuse_req *req;
1290 struct fuse_setattr_in inarg;
1291 struct fuse_attr_out outarg;
1292 bool is_truncate = false;
1293 loff_t oldsize;
1294 int err;
1295
1296 if (!fuse_allow_task(fc, current))
1297 return -EACCES;
1298
1299 if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
1300 attr->ia_valid |= ATTR_FORCE;
1301
1302 err = inode_change_ok(inode, attr);
1303 if (err)
1304 return err;
1305
1306 if (attr->ia_valid & ATTR_OPEN) {
1307 if (fc->atomic_o_trunc)
1308 return 0;
1309 file = NULL;
1310 }
1311
1312 if (attr->ia_valid & ATTR_SIZE)
1313 is_truncate = true;
1314
1315 req = fuse_get_req(fc);
1316 if (IS_ERR(req))
1317 return PTR_ERR(req);
1318
1319 if (is_truncate)
1320 fuse_set_nowrite(inode);
1321
1322 memset(&inarg, 0, sizeof(inarg));
1323 memset(&outarg, 0, sizeof(outarg));
1324 iattr_to_fattr(attr, &inarg);
1325 if (file) {
1326 struct fuse_file *ff = file->private_data;
1327 inarg.valid |= FATTR_FH;
1328 inarg.fh = ff->fh;
1329 }
1330 if (attr->ia_valid & ATTR_SIZE) {
1331 /* For mandatory locking in truncate */
1332 inarg.valid |= FATTR_LOCKOWNER;
1333 inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
1334 }
1335 req->in.h.opcode = FUSE_SETATTR;
1336 req->in.h.nodeid = get_node_id(inode);
1337 req->in.numargs = 1;
1338 req->in.args[0].size = sizeof(inarg);
1339 req->in.args[0].value = &inarg;
1340 req->out.numargs = 1;
1341 if (fc->minor < 9)
1342 req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
1343 else
1344 req->out.args[0].size = sizeof(outarg);
1345 req->out.args[0].value = &outarg;
1346 fuse_request_send(fc, req);
1347 err = req->out.h.error;
1348 fuse_put_request(fc, req);
1349 if (err) {
1350 if (err == -EINTR)
1351 fuse_invalidate_attr(inode);
1352 goto error;
1353 }
1354
1355 if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
1356 make_bad_inode(inode);
1357 err = -EIO;
1358 goto error;
1359 }
1360
1361 spin_lock(&fc->lock);
1362 fuse_change_attributes_common(inode, &outarg.attr,
1363 attr_timeout(&outarg));
1364 oldsize = inode->i_size;
1365 i_size_write(inode, outarg.attr.size);
1366
1367 if (is_truncate) {
1368 /* NOTE: this may release/reacquire fc->lock */
1369 __fuse_release_nowrite(inode);
1370 }
1371 spin_unlock(&fc->lock);
1372
1373 /*
1374 * Only call invalidate_inode_pages2() after removing
1375 * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
1376 */
1377 if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
1378 truncate_pagecache(inode, oldsize, outarg.attr.size);
1379 invalidate_inode_pages2(inode->i_mapping);
1380 }
1381
1382 return 0;
1383
1384 error:
1385 if (is_truncate)
1386 fuse_release_nowrite(inode);
1387
1388 return err;
1389 }
1390
1391 static int fuse_setattr(struct dentry *entry, struct iattr *attr)
1392 {
1393 if (attr->ia_valid & ATTR_FILE)
1394 return fuse_do_setattr(entry, attr, attr->ia_file);
1395 else
1396 return fuse_do_setattr(entry, attr, NULL);
1397 }
1398
1399 static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
1400 struct kstat *stat)
1401 {
1402 struct inode *inode = entry->d_inode;
1403 struct fuse_conn *fc = get_fuse_conn(inode);
1404
1405 if (!fuse_allow_task(fc, current))
1406 return -EACCES;
1407
1408 return fuse_update_attributes(inode, stat, NULL, NULL);
1409 }
1410
1411 static int fuse_setxattr(struct dentry *entry, const char *name,
1412 const void *value, size_t size, int flags)
1413 {
1414 struct inode *inode = entry->d_inode;
1415 struct fuse_conn *fc = get_fuse_conn(inode);
1416 struct fuse_req *req;
1417 struct fuse_setxattr_in inarg;
1418 int err;
1419
1420 if (fc->no_setxattr)
1421 return -EOPNOTSUPP;
1422
1423 req = fuse_get_req(fc);
1424 if (IS_ERR(req))
1425 return PTR_ERR(req);
1426
1427 memset(&inarg, 0, sizeof(inarg));
1428 inarg.size = size;
1429 inarg.flags = flags;
1430 req->in.h.opcode = FUSE_SETXATTR;
1431 req->in.h.nodeid = get_node_id(inode);
1432 req->in.numargs = 3;
1433 req->in.args[0].size = sizeof(inarg);
1434 req->in.args[0].value = &inarg;
1435 req->in.args[1].size = strlen(name) + 1;
1436 req->in.args[1].value = name;
1437 req->in.args[2].size = size;
1438 req->in.args[2].value = value;
1439 fuse_request_send(fc, req);
1440 err = req->out.h.error;
1441 fuse_put_request(fc, req);
1442 if (err == -ENOSYS) {
1443 fc->no_setxattr = 1;
1444 err = -EOPNOTSUPP;
1445 }
1446 return err;
1447 }
1448
1449 static ssize_t fuse_getxattr(struct dentry *entry, const char *name,
1450 void *value, size_t size)
1451 {
1452 struct inode *inode = entry->d_inode;
1453 struct fuse_conn *fc = get_fuse_conn(inode);
1454 struct fuse_req *req;
1455 struct fuse_getxattr_in inarg;
1456 struct fuse_getxattr_out outarg;
1457 ssize_t ret;
1458
1459 if (fc->no_getxattr)
1460 return -EOPNOTSUPP;
1461
1462 req = fuse_get_req(fc);
1463 if (IS_ERR(req))
1464 return PTR_ERR(req);
1465
1466 memset(&inarg, 0, sizeof(inarg));
1467 inarg.size = size;
1468 req->in.h.opcode = FUSE_GETXATTR;
1469 req->in.h.nodeid = get_node_id(inode);
1470 req->in.numargs = 2;
1471 req->in.args[0].size = sizeof(inarg);
1472 req->in.args[0].value = &inarg;
1473 req->in.args[1].size = strlen(name) + 1;
1474 req->in.args[1].value = name;
1475 /* This is really two different operations rolled into one */
1476 req->out.numargs = 1;
1477 if (size) {
1478 req->out.argvar = 1;
1479 req->out.args[0].size = size;
1480 req->out.args[0].value = value;
1481 } else {
1482 req->out.args[0].size = sizeof(outarg);
1483 req->out.args[0].value = &outarg;
1484 }
1485 fuse_request_send(fc, req);
1486 ret = req->out.h.error;
1487 if (!ret)
1488 ret = size ? req->out.args[0].size : outarg.size;
1489 else {
1490 if (ret == -ENOSYS) {
1491 fc->no_getxattr = 1;
1492 ret = -EOPNOTSUPP;
1493 }
1494 }
1495 fuse_put_request(fc, req);
1496 return ret;
1497 }
1498
1499 static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
1500 {
1501 struct inode *inode = entry->d_inode;
1502 struct fuse_conn *fc = get_fuse_conn(inode);
1503 struct fuse_req *req;
1504 struct fuse_getxattr_in inarg;
1505 struct fuse_getxattr_out outarg;
1506 ssize_t ret;
1507
1508 if (!fuse_allow_task(fc, current))
1509 return -EACCES;
1510
1511 if (fc->no_listxattr)
1512 return -EOPNOTSUPP;
1513
1514 req = fuse_get_req(fc);
1515 if (IS_ERR(req))
1516 return PTR_ERR(req);
1517
1518 memset(&inarg, 0, sizeof(inarg));
1519 inarg.size = size;
1520 req->in.h.opcode = FUSE_LISTXATTR;
1521 req->in.h.nodeid = get_node_id(inode);
1522 req->in.numargs = 1;
1523 req->in.args[0].size = sizeof(inarg);
1524 req->in.args[0].value = &inarg;
1525 /* This is really two different operations rolled into one */
1526 req->out.numargs = 1;
1527 if (size) {
1528 req->out.argvar = 1;
1529 req->out.args[0].size = size;
1530 req->out.args[0].value = list;
1531 } else {
1532 req->out.args[0].size = sizeof(outarg);
1533 req->out.args[0].value = &outarg;
1534 }
1535 fuse_request_send(fc, req);
1536 ret = req->out.h.error;
1537 if (!ret)
1538 ret = size ? req->out.args[0].size : outarg.size;
1539 else {
1540 if (ret == -ENOSYS) {
1541 fc->no_listxattr = 1;
1542 ret = -EOPNOTSUPP;
1543 }
1544 }
1545 fuse_put_request(fc, req);
1546 return ret;
1547 }
1548
1549 static int fuse_removexattr(struct dentry *entry, const char *name)
1550 {
1551 struct inode *inode = entry->d_inode;
1552 struct fuse_conn *fc = get_fuse_conn(inode);
1553 struct fuse_req *req;
1554 int err;
1555
1556 if (fc->no_removexattr)
1557 return -EOPNOTSUPP;
1558
1559 req = fuse_get_req(fc);
1560 if (IS_ERR(req))
1561 return PTR_ERR(req);
1562
1563 req->in.h.opcode = FUSE_REMOVEXATTR;
1564 req->in.h.nodeid = get_node_id(inode);
1565 req->in.numargs = 1;
1566 req->in.args[0].size = strlen(name) + 1;
1567 req->in.args[0].value = name;
1568 fuse_request_send(fc, req);
1569 err = req->out.h.error;
1570 fuse_put_request(fc, req);
1571 if (err == -ENOSYS) {
1572 fc->no_removexattr = 1;
1573 err = -EOPNOTSUPP;
1574 }
1575 return err;
1576 }
1577
1578 static const struct inode_operations fuse_dir_inode_operations = {
1579 .lookup = fuse_lookup,
1580 .mkdir = fuse_mkdir,
1581 .symlink = fuse_symlink,
1582 .unlink = fuse_unlink,
1583 .rmdir = fuse_rmdir,
1584 .rename = fuse_rename,
1585 .link = fuse_link,
1586 .setattr = fuse_setattr,
1587 .create = fuse_create,
1588 .mknod = fuse_mknod,
1589 .permission = fuse_permission,
1590 .getattr = fuse_getattr,
1591 .setxattr = fuse_setxattr,
1592 .getxattr = fuse_getxattr,
1593 .listxattr = fuse_listxattr,
1594 .removexattr = fuse_removexattr,
1595 };
1596
1597 static const struct file_operations fuse_dir_operations = {
1598 .llseek = generic_file_llseek,
1599 .read = generic_read_dir,
1600 .readdir = fuse_readdir,
1601 .open = fuse_dir_open,
1602 .release = fuse_dir_release,
1603 .fsync = fuse_dir_fsync,
1604 };
1605
1606 static const struct inode_operations fuse_common_inode_operations = {
1607 .setattr = fuse_setattr,
1608 .permission = fuse_permission,
1609 .getattr = fuse_getattr,
1610 .setxattr = fuse_setxattr,
1611 .getxattr = fuse_getxattr,
1612 .listxattr = fuse_listxattr,
1613 .removexattr = fuse_removexattr,
1614 };
1615
1616 static const struct inode_operations fuse_symlink_inode_operations = {
1617 .setattr = fuse_setattr,
1618 .follow_link = fuse_follow_link,
1619 .put_link = fuse_put_link,
1620 .readlink = generic_readlink,
1621 .getattr = fuse_getattr,
1622 .setxattr = fuse_setxattr,
1623 .getxattr = fuse_getxattr,
1624 .listxattr = fuse_listxattr,
1625 .removexattr = fuse_removexattr,
1626 };
1627
1628 void fuse_init_common(struct inode *inode)
1629 {
1630 inode->i_op = &fuse_common_inode_operations;
1631 }
1632
1633 void fuse_init_dir(struct inode *inode)
1634 {
1635 inode->i_op = &fuse_dir_inode_operations;
1636 inode->i_fop = &fuse_dir_operations;
1637 }
1638
1639 void fuse_init_symlink(struct inode *inode)
1640 {
1641 inode->i_op = &fuse_symlink_inode_operations;
1642 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree