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greth: Use return value of register_netdev
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / fuse / dir.c
blobc9627c95482d1f316102272e7aee88e1f2f31fe0
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/gfp.h>
14 #include <linux/sched.h>
15 #include <linux/namei.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 = entry->d_inode;
160
161 if (inode && is_bad_inode(inode))
162 return 0;
163 else if (fuse_dentry_time(entry) < get_jiffies_64()) {
164 int err;
165 struct fuse_entry_out outarg;
166 struct fuse_conn *fc;
167 struct fuse_req *req;
168 struct fuse_req *forget_req;
169 struct dentry *parent;
170 u64 attr_version;
171
172 /* For negative dentries, always do a fresh lookup */
173 if (!inode)
174 return 0;
175
176 fc = get_fuse_conn(inode);
177 req = fuse_get_req(fc);
178 if (IS_ERR(req))
179 return 0;
180
181 forget_req = fuse_get_req(fc);
182 if (IS_ERR(forget_req)) {
183 fuse_put_request(fc, req);
184 return 0;
185 }
186
187 attr_version = fuse_get_attr_version(fc);
188
189 parent = dget_parent(entry);
190 fuse_lookup_init(fc, req, get_node_id(parent->d_inode),
191 &entry->d_name, &outarg);
192 fuse_request_send(fc, req);
193 dput(parent);
194 err = req->out.h.error;
195 fuse_put_request(fc, req);
196 /* Zero nodeid is same as -ENOENT */
197 if (!err && !outarg.nodeid)
198 err = -ENOENT;
199 if (!err) {
200 struct fuse_inode *fi = get_fuse_inode(inode);
201 if (outarg.nodeid != get_node_id(inode)) {
202 fuse_send_forget(fc, forget_req,
203 outarg.nodeid, 1);
204 return 0;
205 }
206 spin_lock(&fc->lock);
207 fi->nlookup++;
208 spin_unlock(&fc->lock);
209 }
210 fuse_put_request(fc, forget_req);
211 if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
212 return 0;
213
214 fuse_change_attributes(inode, &outarg.attr,
215 entry_attr_timeout(&outarg),
216 attr_version);
217 fuse_change_entry_timeout(entry, &outarg);
218 }
219 return 1;
220 }
221
222 static int invalid_nodeid(u64 nodeid)
223 {
224 return !nodeid || nodeid == FUSE_ROOT_ID;
225 }
226
227 const struct dentry_operations fuse_dentry_operations = {
228 .d_revalidate = fuse_dentry_revalidate,
229 };
230
231 int fuse_valid_type(int m)
232 {
233 return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) ||
234 S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m);
235 }
236
237 /*
238 * Add a directory inode to a dentry, ensuring that no other dentry
239 * refers to this inode. Called with fc->inst_mutex.
240 */
241 static struct dentry *fuse_d_add_directory(struct dentry *entry,
242 struct inode *inode)
243 {
244 struct dentry *alias = d_find_alias(inode);
245 if (alias && !(alias->d_flags & DCACHE_DISCONNECTED)) {
246 /* This tries to shrink the subtree below alias */
247 fuse_invalidate_entry(alias);
248 dput(alias);
249 if (!list_empty(&inode->i_dentry))
250 return ERR_PTR(-EBUSY);
251 } else {
252 dput(alias);
253 }
254 return d_splice_alias(inode, entry);
255 }
256
257 int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
258 struct fuse_entry_out *outarg, struct inode **inode)
259 {
260 struct fuse_conn *fc = get_fuse_conn_super(sb);
261 struct fuse_req *req;
262 struct fuse_req *forget_req;
263 u64 attr_version;
264 int err;
265
266 *inode = NULL;
267 err = -ENAMETOOLONG;
268 if (name->len > FUSE_NAME_MAX)
269 goto out;
270
271 req = fuse_get_req(fc);
272 err = PTR_ERR(req);
273 if (IS_ERR(req))
274 goto out;
275
276 forget_req = fuse_get_req(fc);
277 err = PTR_ERR(forget_req);
278 if (IS_ERR(forget_req)) {
279 fuse_put_request(fc, req);
280 goto out;
281 }
282
283 attr_version = fuse_get_attr_version(fc);
284
285 fuse_lookup_init(fc, req, nodeid, name, outarg);
286 fuse_request_send(fc, req);
287 err = req->out.h.error;
288 fuse_put_request(fc, req);
289 /* Zero nodeid is same as -ENOENT, but with valid timeout */
290 if (err || !outarg->nodeid)
291 goto out_put_forget;
292
293 err = -EIO;
294 if (!outarg->nodeid)
295 goto out_put_forget;
296 if (!fuse_valid_type(outarg->attr.mode))
297 goto out_put_forget;
298
299 *inode = fuse_iget(sb, outarg->nodeid, outarg->generation,
300 &outarg->attr, entry_attr_timeout(outarg),
301 attr_version);
302 err = -ENOMEM;
303 if (!*inode) {
304 fuse_send_forget(fc, forget_req, outarg->nodeid, 1);
305 goto out;
306 }
307 err = 0;
308
309 out_put_forget:
310 fuse_put_request(fc, forget_req);
311 out:
312 return err;
313 }
314
315 static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
316 struct nameidata *nd)
317 {
318 int err;
319 struct fuse_entry_out outarg;
320 struct inode *inode;
321 struct dentry *newent;
322 struct fuse_conn *fc = get_fuse_conn(dir);
323 bool outarg_valid = true;
324
325 err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name,
326 &outarg, &inode);
327 if (err == -ENOENT) {
328 outarg_valid = false;
329 err = 0;
330 }
331 if (err)
332 goto out_err;
333
334 err = -EIO;
335 if (inode && get_node_id(inode) == FUSE_ROOT_ID)
336 goto out_iput;
337
338 if (inode && S_ISDIR(inode->i_mode)) {
339 mutex_lock(&fc->inst_mutex);
340 newent = fuse_d_add_directory(entry, inode);
341 mutex_unlock(&fc->inst_mutex);
342 err = PTR_ERR(newent);
343 if (IS_ERR(newent))
344 goto out_iput;
345 } else {
346 newent = d_splice_alias(inode, entry);
347 }
348
349 entry = newent ? newent : entry;
350 entry->d_op = &fuse_dentry_operations;
351 if (outarg_valid)
352 fuse_change_entry_timeout(entry, &outarg);
353 else
354 fuse_invalidate_entry_cache(entry);
355
356 return newent;
357
358 out_iput:
359 iput(inode);
360 out_err:
361 return ERR_PTR(err);
362 }
363
364 /*
365 * Atomic create+open operation
366 *
367 * If the filesystem doesn't support this, then fall back to separate
368 * 'mknod' + 'open' requests.
369 */
370 static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
371 struct nameidata *nd)
372 {
373 int err;
374 struct inode *inode;
375 struct fuse_conn *fc = get_fuse_conn(dir);
376 struct fuse_req *req;
377 struct fuse_req *forget_req;
378 struct fuse_create_in inarg;
379 struct fuse_open_out outopen;
380 struct fuse_entry_out outentry;
381 struct fuse_file *ff;
382 struct file *file;
383 int flags = nd->intent.open.flags - 1;
384
385 if (fc->no_create)
386 return -ENOSYS;
387
388 if (flags & O_DIRECT)
389 return -EINVAL;
390
391 forget_req = fuse_get_req(fc);
392 if (IS_ERR(forget_req))
393 return PTR_ERR(forget_req);
394
395 req = fuse_get_req(fc);
396 err = PTR_ERR(req);
397 if (IS_ERR(req))
398 goto out_put_forget_req;
399
400 err = -ENOMEM;
401 ff = fuse_file_alloc(fc);
402 if (!ff)
403 goto out_put_request;
404
405 if (!fc->dont_mask)
406 mode &= ~current_umask();
407
408 flags &= ~O_NOCTTY;
409 memset(&inarg, 0, sizeof(inarg));
410 memset(&outentry, 0, sizeof(outentry));
411 inarg.flags = flags;
412 inarg.mode = mode;
413 inarg.umask = current_umask();
414 req->in.h.opcode = FUSE_CREATE;
415 req->in.h.nodeid = get_node_id(dir);
416 req->in.numargs = 2;
417 req->in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) :
418 sizeof(inarg);
419 req->in.args[0].value = &inarg;
420 req->in.args[1].size = entry->d_name.len + 1;
421 req->in.args[1].value = entry->d_name.name;
422 req->out.numargs = 2;
423 if (fc->minor < 9)
424 req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
425 else
426 req->out.args[0].size = sizeof(outentry);
427 req->out.args[0].value = &outentry;
428 req->out.args[1].size = sizeof(outopen);
429 req->out.args[1].value = &outopen;
430 fuse_request_send(fc, req);
431 err = req->out.h.error;
432 if (err) {
433 if (err == -ENOSYS)
434 fc->no_create = 1;
435 goto out_free_ff;
436 }
437
438 err = -EIO;
439 if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid))
440 goto out_free_ff;
441
442 fuse_put_request(fc, req);
443 ff->fh = outopen.fh;
444 ff->nodeid = outentry.nodeid;
445 ff->open_flags = outopen.open_flags;
446 inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation,
447 &outentry.attr, entry_attr_timeout(&outentry), 0);
448 if (!inode) {
449 flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
450 fuse_sync_release(ff, flags);
451 fuse_send_forget(fc, forget_req, outentry.nodeid, 1);
452 return -ENOMEM;
453 }
454 fuse_put_request(fc, forget_req);
455 d_instantiate(entry, inode);
456 fuse_change_entry_timeout(entry, &outentry);
457 fuse_invalidate_attr(dir);
458 file = lookup_instantiate_filp(nd, entry, generic_file_open);
459 if (IS_ERR(file)) {
460 fuse_sync_release(ff, flags);
461 return PTR_ERR(file);
462 }
463 file->private_data = fuse_file_get(ff);
464 fuse_finish_open(inode, file);
465 return 0;
466
467 out_free_ff:
468 fuse_file_free(ff);
469 out_put_request:
470 fuse_put_request(fc, req);
471 out_put_forget_req:
472 fuse_put_request(fc, forget_req);
473 return err;
474 }
475
476 /*
477 * Code shared between mknod, mkdir, symlink and link
478 */
479 static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
480 struct inode *dir, struct dentry *entry,
481 int mode)
482 {
483 struct fuse_entry_out outarg;
484 struct inode *inode;
485 int err;
486 struct fuse_req *forget_req;
487
488 forget_req = fuse_get_req(fc);
489 if (IS_ERR(forget_req)) {
490 fuse_put_request(fc, req);
491 return PTR_ERR(forget_req);
492 }
493
494 memset(&outarg, 0, sizeof(outarg));
495 req->in.h.nodeid = get_node_id(dir);
496 req->out.numargs = 1;
497 if (fc->minor < 9)
498 req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
499 else
500 req->out.args[0].size = sizeof(outarg);
501 req->out.args[0].value = &outarg;
502 fuse_request_send(fc, req);
503 err = req->out.h.error;
504 fuse_put_request(fc, req);
505 if (err)
506 goto out_put_forget_req;
507
508 err = -EIO;
509 if (invalid_nodeid(outarg.nodeid))
510 goto out_put_forget_req;
511
512 if ((outarg.attr.mode ^ mode) & S_IFMT)
513 goto out_put_forget_req;
514
515 inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
516 &outarg.attr, entry_attr_timeout(&outarg), 0);
517 if (!inode) {
518 fuse_send_forget(fc, forget_req, outarg.nodeid, 1);
519 return -ENOMEM;
520 }
521 fuse_put_request(fc, forget_req);
522
523 if (S_ISDIR(inode->i_mode)) {
524 struct dentry *alias;
525 mutex_lock(&fc->inst_mutex);
526 alias = d_find_alias(inode);
527 if (alias) {
528 /* New directory must have moved since mkdir */
529 mutex_unlock(&fc->inst_mutex);
530 dput(alias);
531 iput(inode);
532 return -EBUSY;
533 }
534 d_instantiate(entry, inode);
535 mutex_unlock(&fc->inst_mutex);
536 } else
537 d_instantiate(entry, inode);
538
539 fuse_change_entry_timeout(entry, &outarg);
540 fuse_invalidate_attr(dir);
541 return 0;
542
543 out_put_forget_req:
544 fuse_put_request(fc, forget_req);
545 return err;
546 }
547
548 static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode,
549 dev_t rdev)
550 {
551 struct fuse_mknod_in inarg;
552 struct fuse_conn *fc = get_fuse_conn(dir);
553 struct fuse_req *req = fuse_get_req(fc);
554 if (IS_ERR(req))
555 return PTR_ERR(req);
556
557 if (!fc->dont_mask)
558 mode &= ~current_umask();
559
560 memset(&inarg, 0, sizeof(inarg));
561 inarg.mode = mode;
562 inarg.rdev = new_encode_dev(rdev);
563 inarg.umask = current_umask();
564 req->in.h.opcode = FUSE_MKNOD;
565 req->in.numargs = 2;
566 req->in.args[0].size = fc->minor < 12 ? FUSE_COMPAT_MKNOD_IN_SIZE :
567 sizeof(inarg);
568 req->in.args[0].value = &inarg;
569 req->in.args[1].size = entry->d_name.len + 1;
570 req->in.args[1].value = entry->d_name.name;
571 return create_new_entry(fc, req, dir, entry, mode);
572 }
573
574 static int fuse_create(struct inode *dir, struct dentry *entry, int mode,
575 struct nameidata *nd)
576 {
577 if (nd && (nd->flags & LOOKUP_OPEN)) {
578 int err = fuse_create_open(dir, entry, mode, nd);
579 if (err != -ENOSYS)
580 return err;
581 /* Fall back on mknod */
582 }
583 return fuse_mknod(dir, entry, mode, 0);
584 }
585
586 static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode)
587 {
588 struct fuse_mkdir_in inarg;
589 struct fuse_conn *fc = get_fuse_conn(dir);
590 struct fuse_req *req = fuse_get_req(fc);
591 if (IS_ERR(req))
592 return PTR_ERR(req);
593
594 if (!fc->dont_mask)
595 mode &= ~current_umask();
596
597 memset(&inarg, 0, sizeof(inarg));
598 inarg.mode = mode;
599 inarg.umask = current_umask();
600 req->in.h.opcode = FUSE_MKDIR;
601 req->in.numargs = 2;
602 req->in.args[0].size = sizeof(inarg);
603 req->in.args[0].value = &inarg;
604 req->in.args[1].size = entry->d_name.len + 1;
605 req->in.args[1].value = entry->d_name.name;
606 return create_new_entry(fc, req, dir, entry, S_IFDIR);
607 }
608
609 static int fuse_symlink(struct inode *dir, struct dentry *entry,
610 const char *link)
611 {
612 struct fuse_conn *fc = get_fuse_conn(dir);
613 unsigned len = strlen(link) + 1;
614 struct fuse_req *req = fuse_get_req(fc);
615 if (IS_ERR(req))
616 return PTR_ERR(req);
617
618 req->in.h.opcode = FUSE_SYMLINK;
619 req->in.numargs = 2;
620 req->in.args[0].size = entry->d_name.len + 1;
621 req->in.args[0].value = entry->d_name.name;
622 req->in.args[1].size = len;
623 req->in.args[1].value = link;
624 return create_new_entry(fc, req, dir, entry, S_IFLNK);
625 }
626
627 static int fuse_unlink(struct inode *dir, struct dentry *entry)
628 {
629 int err;
630 struct fuse_conn *fc = get_fuse_conn(dir);
631 struct fuse_req *req = fuse_get_req(fc);
632 if (IS_ERR(req))
633 return PTR_ERR(req);
634
635 req->in.h.opcode = FUSE_UNLINK;
636 req->in.h.nodeid = get_node_id(dir);
637 req->in.numargs = 1;
638 req->in.args[0].size = entry->d_name.len + 1;
639 req->in.args[0].value = entry->d_name.name;
640 fuse_request_send(fc, req);
641 err = req->out.h.error;
642 fuse_put_request(fc, req);
643 if (!err) {
644 struct inode *inode = entry->d_inode;
645
646 /*
647 * Set nlink to zero so the inode can be cleared, if the inode
648 * does have more links this will be discovered at the next
649 * lookup/getattr.
650 */
651 clear_nlink(inode);
652 fuse_invalidate_attr(inode);
653 fuse_invalidate_attr(dir);
654 fuse_invalidate_entry_cache(entry);
655 } else if (err == -EINTR)
656 fuse_invalidate_entry(entry);
657 return err;
658 }
659
660 static int fuse_rmdir(struct inode *dir, struct dentry *entry)
661 {
662 int err;
663 struct fuse_conn *fc = get_fuse_conn(dir);
664 struct fuse_req *req = fuse_get_req(fc);
665 if (IS_ERR(req))
666 return PTR_ERR(req);
667
668 req->in.h.opcode = FUSE_RMDIR;
669 req->in.h.nodeid = get_node_id(dir);
670 req->in.numargs = 1;
671 req->in.args[0].size = entry->d_name.len + 1;
672 req->in.args[0].value = entry->d_name.name;
673 fuse_request_send(fc, req);
674 err = req->out.h.error;
675 fuse_put_request(fc, req);
676 if (!err) {
677 clear_nlink(entry->d_inode);
678 fuse_invalidate_attr(dir);
679 fuse_invalidate_entry_cache(entry);
680 } else if (err == -EINTR)
681 fuse_invalidate_entry(entry);
682 return err;
683 }
684
685 static int fuse_rename(struct inode *olddir, struct dentry *oldent,
686 struct inode *newdir, struct dentry *newent)
687 {
688 int err;
689 struct fuse_rename_in inarg;
690 struct fuse_conn *fc = get_fuse_conn(olddir);
691 struct fuse_req *req = fuse_get_req(fc);
692 if (IS_ERR(req))
693 return PTR_ERR(req);
694
695 memset(&inarg, 0, sizeof(inarg));
696 inarg.newdir = get_node_id(newdir);
697 req->in.h.opcode = FUSE_RENAME;
698 req->in.h.nodeid = get_node_id(olddir);
699 req->in.numargs = 3;
700 req->in.args[0].size = sizeof(inarg);
701 req->in.args[0].value = &inarg;
702 req->in.args[1].size = oldent->d_name.len + 1;
703 req->in.args[1].value = oldent->d_name.name;
704 req->in.args[2].size = newent->d_name.len + 1;
705 req->in.args[2].value = newent->d_name.name;
706 fuse_request_send(fc, req);
707 err = req->out.h.error;
708 fuse_put_request(fc, req);
709 if (!err) {
710 /* ctime changes */
711 fuse_invalidate_attr(oldent->d_inode);
712
713 fuse_invalidate_attr(olddir);
714 if (olddir != newdir)
715 fuse_invalidate_attr(newdir);
716
717 /* newent will end up negative */
718 if (newent->d_inode) {
719 fuse_invalidate_attr(newent->d_inode);
720 fuse_invalidate_entry_cache(newent);
721 }
722 } else if (err == -EINTR) {
723 /* If request was interrupted, DEITY only knows if the
724 rename actually took place. If the invalidation
725 fails (e.g. some process has CWD under the renamed
726 directory), then there can be inconsistency between
727 the dcache and the real filesystem. Tough luck. */
728 fuse_invalidate_entry(oldent);
729 if (newent->d_inode)
730 fuse_invalidate_entry(newent);
731 }
732
733 return err;
734 }
735
736 static int fuse_link(struct dentry *entry, struct inode *newdir,
737 struct dentry *newent)
738 {
739 int err;
740 struct fuse_link_in inarg;
741 struct inode *inode = entry->d_inode;
742 struct fuse_conn *fc = get_fuse_conn(inode);
743 struct fuse_req *req = fuse_get_req(fc);
744 if (IS_ERR(req))
745 return PTR_ERR(req);
746
747 memset(&inarg, 0, sizeof(inarg));
748 inarg.oldnodeid = get_node_id(inode);
749 req->in.h.opcode = FUSE_LINK;
750 req->in.numargs = 2;
751 req->in.args[0].size = sizeof(inarg);
752 req->in.args[0].value = &inarg;
753 req->in.args[1].size = newent->d_name.len + 1;
754 req->in.args[1].value = newent->d_name.name;
755 err = create_new_entry(fc, req, newdir, newent, inode->i_mode);
756 /* Contrary to "normal" filesystems it can happen that link
757 makes two "logical" inodes point to the same "physical"
758 inode. We invalidate the attributes of the old one, so it
759 will reflect changes in the backing inode (link count,
760 etc.)
761 */
762 if (!err || err == -EINTR)
763 fuse_invalidate_attr(inode);
764 return err;
765 }
766
767 static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr,
768 struct kstat *stat)
769 {
770 stat->dev = inode->i_sb->s_dev;
771 stat->ino = attr->ino;
772 stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
773 stat->nlink = attr->nlink;
774 stat->uid = attr->uid;
775 stat->gid = attr->gid;
776 stat->rdev = inode->i_rdev;
777 stat->atime.tv_sec = attr->atime;
778 stat->atime.tv_nsec = attr->atimensec;
779 stat->mtime.tv_sec = attr->mtime;
780 stat->mtime.tv_nsec = attr->mtimensec;
781 stat->ctime.tv_sec = attr->ctime;
782 stat->ctime.tv_nsec = attr->ctimensec;
783 stat->size = attr->size;
784 stat->blocks = attr->blocks;
785 stat->blksize = (1 << inode->i_blkbits);
786 }
787
788 static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
789 struct file *file)
790 {
791 int err;
792 struct fuse_getattr_in inarg;
793 struct fuse_attr_out outarg;
794 struct fuse_conn *fc = get_fuse_conn(inode);
795 struct fuse_req *req;
796 u64 attr_version;
797
798 req = fuse_get_req(fc);
799 if (IS_ERR(req))
800 return PTR_ERR(req);
801
802 attr_version = fuse_get_attr_version(fc);
803
804 memset(&inarg, 0, sizeof(inarg));
805 memset(&outarg, 0, sizeof(outarg));
806 /* Directories have separate file-handle space */
807 if (file && S_ISREG(inode->i_mode)) {
808 struct fuse_file *ff = file->private_data;
809
810 inarg.getattr_flags |= FUSE_GETATTR_FH;
811 inarg.fh = ff->fh;
812 }
813 req->in.h.opcode = FUSE_GETATTR;
814 req->in.h.nodeid = get_node_id(inode);
815 req->in.numargs = 1;
816 req->in.args[0].size = sizeof(inarg);
817 req->in.args[0].value = &inarg;
818 req->out.numargs = 1;
819 if (fc->minor < 9)
820 req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
821 else
822 req->out.args[0].size = sizeof(outarg);
823 req->out.args[0].value = &outarg;
824 fuse_request_send(fc, req);
825 err = req->out.h.error;
826 fuse_put_request(fc, req);
827 if (!err) {
828 if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
829 make_bad_inode(inode);
830 err = -EIO;
831 } else {
832 fuse_change_attributes(inode, &outarg.attr,
833 attr_timeout(&outarg),
834 attr_version);
835 if (stat)
836 fuse_fillattr(inode, &outarg.attr, stat);
837 }
838 }
839 return err;
840 }
841
842 int fuse_update_attributes(struct inode *inode, struct kstat *stat,
843 struct file *file, bool *refreshed)
844 {
845 struct fuse_inode *fi = get_fuse_inode(inode);
846 int err;
847 bool r;
848
849 if (fi->i_time < get_jiffies_64()) {
850 r = true;
851 err = fuse_do_getattr(inode, stat, file);
852 } else {
853 r = false;
854 err = 0;
855 if (stat) {
856 generic_fillattr(inode, stat);
857 stat->mode = fi->orig_i_mode;
858 }
859 }
860
861 if (refreshed != NULL)
862 *refreshed = r;
863
864 return err;
865 }
866
867 int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
868 struct qstr *name)
869 {
870 int err = -ENOTDIR;
871 struct inode *parent;
872 struct dentry *dir;
873 struct dentry *entry;
874
875 parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid);
876 if (!parent)
877 return -ENOENT;
878
879 mutex_lock(&parent->i_mutex);
880 if (!S_ISDIR(parent->i_mode))
881 goto unlock;
882
883 err = -ENOENT;
884 dir = d_find_alias(parent);
885 if (!dir)
886 goto unlock;
887
888 entry = d_lookup(dir, name);
889 dput(dir);
890 if (!entry)
891 goto unlock;
892
893 fuse_invalidate_attr(parent);
894 fuse_invalidate_entry(entry);
895 dput(entry);
896 err = 0;
897
898 unlock:
899 mutex_unlock(&parent->i_mutex);
900 iput(parent);
901 return err;
902 }
903
904 /*
905 * Calling into a user-controlled filesystem gives the filesystem
906 * daemon ptrace-like capabilities over the requester process. This
907 * means, that the filesystem daemon is able to record the exact
908 * filesystem operations performed, and can also control the behavior
909 * of the requester process in otherwise impossible ways. For example
910 * it can delay the operation for arbitrary length of time allowing
911 * DoS against the requester.
912 *
913 * For this reason only those processes can call into the filesystem,
914 * for which the owner of the mount has ptrace privilege. This
915 * excludes processes started by other users, suid or sgid processes.
916 */
917 int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task)
918 {
919 const struct cred *cred;
920 int ret;
921
922 if (fc->flags & FUSE_ALLOW_OTHER)
923 return 1;
924
925 rcu_read_lock();
926 ret = 0;
927 cred = __task_cred(task);
928 if (cred->euid == fc->user_id &&
929 cred->suid == fc->user_id &&
930 cred->uid == fc->user_id &&
931 cred->egid == fc->group_id &&
932 cred->sgid == fc->group_id &&
933 cred->gid == fc->group_id)
934 ret = 1;
935 rcu_read_unlock();
936
937 return ret;
938 }
939
940 static int fuse_access(struct inode *inode, int mask)
941 {
942 struct fuse_conn *fc = get_fuse_conn(inode);
943 struct fuse_req *req;
944 struct fuse_access_in inarg;
945 int err;
946
947 if (fc->no_access)
948 return 0;
949
950 req = fuse_get_req(fc);
951 if (IS_ERR(req))
952 return PTR_ERR(req);
953
954 memset(&inarg, 0, sizeof(inarg));
955 inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC);
956 req->in.h.opcode = FUSE_ACCESS;
957 req->in.h.nodeid = get_node_id(inode);
958 req->in.numargs = 1;
959 req->in.args[0].size = sizeof(inarg);
960 req->in.args[0].value = &inarg;
961 fuse_request_send(fc, req);
962 err = req->out.h.error;
963 fuse_put_request(fc, req);
964 if (err == -ENOSYS) {
965 fc->no_access = 1;
966 err = 0;
967 }
968 return err;
969 }
970
971 /*
972 * Check permission. The two basic access models of FUSE are:
973 *
974 * 1) Local access checking ('default_permissions' mount option) based
975 * on file mode. This is the plain old disk filesystem permission
976 * modell.
977 *
978 * 2) "Remote" access checking, where server is responsible for
979 * checking permission in each inode operation. An exception to this
980 * is if ->permission() was invoked from sys_access() in which case an
981 * access request is sent. Execute permission is still checked
982 * locally based on file mode.
983 */
984 static int fuse_permission(struct inode *inode, int mask)
985 {
986 struct fuse_conn *fc = get_fuse_conn(inode);
987 bool refreshed = false;
988 int err = 0;
989
990 if (!fuse_allow_task(fc, current))
991 return -EACCES;
992
993 /*
994 * If attributes are needed, refresh them before proceeding
995 */
996 if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) ||
997 ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) {
998 err = fuse_update_attributes(inode, NULL, NULL, &refreshed);
999 if (err)
1000 return err;
1001 }
1002
1003 if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
1004 err = generic_permission(inode, mask, NULL);
1005
1006 /* If permission is denied, try to refresh file
1007 attributes. This is also needed, because the root
1008 node will at first have no permissions */
1009 if (err == -EACCES && !refreshed) {
1010 err = fuse_do_getattr(inode, NULL, NULL);
1011 if (!err)
1012 err = generic_permission(inode, mask, NULL);
1013 }
1014
1015 /* Note: the opposite of the above test does not
1016 exist. So if permissions are revoked this won't be
1017 noticed immediately, only after the attribute
1018 timeout has expired */
1019 } else if (mask & (MAY_ACCESS | MAY_CHDIR)) {
1020 err = fuse_access(inode, mask);
1021 } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) {
1022 if (!(inode->i_mode & S_IXUGO)) {
1023 if (refreshed)
1024 return -EACCES;
1025
1026 err = fuse_do_getattr(inode, NULL, NULL);
1027 if (!err && !(inode->i_mode & S_IXUGO))
1028 return -EACCES;
1029 }
1030 }
1031 return err;
1032 }
1033
1034 static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
1035 void *dstbuf, filldir_t filldir)
1036 {
1037 while (nbytes >= FUSE_NAME_OFFSET) {
1038 struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
1039 size_t reclen = FUSE_DIRENT_SIZE(dirent);
1040 int over;
1041 if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
1042 return -EIO;
1043 if (reclen > nbytes)
1044 break;
1045
1046 over = filldir(dstbuf, dirent->name, dirent->namelen,
1047 file->f_pos, dirent->ino, dirent->type);
1048 if (over)
1049 break;
1050
1051 buf += reclen;
1052 nbytes -= reclen;
1053 file->f_pos = dirent->off;
1054 }
1055
1056 return 0;
1057 }
1058
1059 static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
1060 {
1061 int err;
1062 size_t nbytes;
1063 struct page *page;
1064 struct inode *inode = file->f_path.dentry->d_inode;
1065 struct fuse_conn *fc = get_fuse_conn(inode);
1066 struct fuse_req *req;
1067
1068 if (is_bad_inode(inode))
1069 return -EIO;
1070
1071 req = fuse_get_req(fc);
1072 if (IS_ERR(req))
1073 return PTR_ERR(req);
1074
1075 page = alloc_page(GFP_KERNEL);
1076 if (!page) {
1077 fuse_put_request(fc, req);
1078 return -ENOMEM;
1079 }
1080 req->out.argpages = 1;
1081 req->num_pages = 1;
1082 req->pages[0] = page;
1083 fuse_read_fill(req, file, file->f_pos, PAGE_SIZE, FUSE_READDIR);
1084 fuse_request_send(fc, req);
1085 nbytes = req->out.args[0].size;
1086 err = req->out.h.error;
1087 fuse_put_request(fc, req);
1088 if (!err)
1089 err = parse_dirfile(page_address(page), nbytes, file, dstbuf,
1090 filldir);
1091
1092 __free_page(page);
1093 fuse_invalidate_attr(inode); /* atime changed */
1094 return err;
1095 }
1096
1097 static char *read_link(struct dentry *dentry)
1098 {
1099 struct inode *inode = dentry->d_inode;
1100 struct fuse_conn *fc = get_fuse_conn(inode);
1101 struct fuse_req *req = fuse_get_req(fc);
1102 char *link;
1103
1104 if (IS_ERR(req))
1105 return ERR_CAST(req);
1106
1107 link = (char *) __get_free_page(GFP_KERNEL);
1108 if (!link) {
1109 link = ERR_PTR(-ENOMEM);
1110 goto out;
1111 }
1112 req->in.h.opcode = FUSE_READLINK;
1113 req->in.h.nodeid = get_node_id(inode);
1114 req->out.argvar = 1;
1115 req->out.numargs = 1;
1116 req->out.args[0].size = PAGE_SIZE - 1;
1117 req->out.args[0].value = link;
1118 fuse_request_send(fc, req);
1119 if (req->out.h.error) {
1120 free_page((unsigned long) link);
1121 link = ERR_PTR(req->out.h.error);
1122 } else
1123 link[req->out.args[0].size] = '\0';
1124 out:
1125 fuse_put_request(fc, req);
1126 fuse_invalidate_attr(inode); /* atime changed */
1127 return link;
1128 }
1129
1130 static void free_link(char *link)
1131 {
1132 if (!IS_ERR(link))
1133 free_page((unsigned long) link);
1134 }
1135
1136 static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd)
1137 {
1138 nd_set_link(nd, read_link(dentry));
1139 return NULL;
1140 }
1141
1142 static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c)
1143 {
1144 free_link(nd_get_link(nd));
1145 }
1146
1147 static int fuse_dir_open(struct inode *inode, struct file *file)
1148 {
1149 return fuse_open_common(inode, file, true);
1150 }
1151
1152 static int fuse_dir_release(struct inode *inode, struct file *file)
1153 {
1154 fuse_release_common(file, FUSE_RELEASEDIR);
1155
1156 return 0;
1157 }
1158
1159 static int fuse_dir_fsync(struct file *file, int datasync)
1160 {
1161 return fuse_fsync_common(file, datasync, 1);
1162 }
1163
1164 static bool update_mtime(unsigned ivalid)
1165 {
1166 /* Always update if mtime is explicitly set */
1167 if (ivalid & ATTR_MTIME_SET)
1168 return true;
1169
1170 /* If it's an open(O_TRUNC) or an ftruncate(), don't update */
1171 if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE)))
1172 return false;
1173
1174 /* In all other cases update */
1175 return true;
1176 }
1177
1178 static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg)
1179 {
1180 unsigned ivalid = iattr->ia_valid;
1181
1182 if (ivalid & ATTR_MODE)
1183 arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode;
1184 if (ivalid & ATTR_UID)
1185 arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid;
1186 if (ivalid & ATTR_GID)
1187 arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid;
1188 if (ivalid & ATTR_SIZE)
1189 arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size;
1190 if (ivalid & ATTR_ATIME) {
1191 arg->valid |= FATTR_ATIME;
1192 arg->atime = iattr->ia_atime.tv_sec;
1193 arg->atimensec = iattr->ia_atime.tv_nsec;
1194 if (!(ivalid & ATTR_ATIME_SET))
1195 arg->valid |= FATTR_ATIME_NOW;
1196 }
1197 if ((ivalid & ATTR_MTIME) && update_mtime(ivalid)) {
1198 arg->valid |= FATTR_MTIME;
1199 arg->mtime = iattr->ia_mtime.tv_sec;
1200 arg->mtimensec = iattr->ia_mtime.tv_nsec;
1201 if (!(ivalid & ATTR_MTIME_SET))
1202 arg->valid |= FATTR_MTIME_NOW;
1203 }
1204 }
1205
1206 /*
1207 * Prevent concurrent writepages on inode
1208 *
1209 * This is done by adding a negative bias to the inode write counter
1210 * and waiting for all pending writes to finish.
1211 */
1212 void fuse_set_nowrite(struct inode *inode)
1213 {
1214 struct fuse_conn *fc = get_fuse_conn(inode);
1215 struct fuse_inode *fi = get_fuse_inode(inode);
1216
1217 BUG_ON(!mutex_is_locked(&inode->i_mutex));
1218
1219 spin_lock(&fc->lock);
1220 BUG_ON(fi->writectr < 0);
1221 fi->writectr += FUSE_NOWRITE;
1222 spin_unlock(&fc->lock);
1223 wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE);
1224 }
1225
1226 /*
1227 * Allow writepages on inode
1228 *
1229 * Remove the bias from the writecounter and send any queued
1230 * writepages.
1231 */
1232 static void __fuse_release_nowrite(struct inode *inode)
1233 {
1234 struct fuse_inode *fi = get_fuse_inode(inode);
1235
1236 BUG_ON(fi->writectr != FUSE_NOWRITE);
1237 fi->writectr = 0;
1238 fuse_flush_writepages(inode);
1239 }
1240
1241 void fuse_release_nowrite(struct inode *inode)
1242 {
1243 struct fuse_conn *fc = get_fuse_conn(inode);
1244
1245 spin_lock(&fc->lock);
1246 __fuse_release_nowrite(inode);
1247 spin_unlock(&fc->lock);
1248 }
1249
1250 /*
1251 * Set attributes, and at the same time refresh them.
1252 *
1253 * Truncation is slightly complicated, because the 'truncate' request
1254 * may fail, in which case we don't want to touch the mapping.
1255 * vmtruncate() doesn't allow for this case, so do the rlimit checking
1256 * and the actual truncation by hand.
1257 */
1258 static int fuse_do_setattr(struct dentry *entry, struct iattr *attr,
1259 struct file *file)
1260 {
1261 struct inode *inode = entry->d_inode;
1262 struct fuse_conn *fc = get_fuse_conn(inode);
1263 struct fuse_req *req;
1264 struct fuse_setattr_in inarg;
1265 struct fuse_attr_out outarg;
1266 bool is_truncate = false;
1267 loff_t oldsize;
1268 int err;
1269
1270 if (!fuse_allow_task(fc, current))
1271 return -EACCES;
1272
1273 if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
1274 attr->ia_valid |= ATTR_FORCE;
1275
1276 err = inode_change_ok(inode, attr);
1277 if (err)
1278 return err;
1279
1280 if ((attr->ia_valid & ATTR_OPEN) && fc->atomic_o_trunc)
1281 return 0;
1282
1283 if (attr->ia_valid & ATTR_SIZE)
1284 is_truncate = true;
1285
1286 req = fuse_get_req(fc);
1287 if (IS_ERR(req))
1288 return PTR_ERR(req);
1289
1290 if (is_truncate)
1291 fuse_set_nowrite(inode);
1292
1293 memset(&inarg, 0, sizeof(inarg));
1294 memset(&outarg, 0, sizeof(outarg));
1295 iattr_to_fattr(attr, &inarg);
1296 if (file) {
1297 struct fuse_file *ff = file->private_data;
1298 inarg.valid |= FATTR_FH;
1299 inarg.fh = ff->fh;
1300 }
1301 if (attr->ia_valid & ATTR_SIZE) {
1302 /* For mandatory locking in truncate */
1303 inarg.valid |= FATTR_LOCKOWNER;
1304 inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
1305 }
1306 req->in.h.opcode = FUSE_SETATTR;
1307 req->in.h.nodeid = get_node_id(inode);
1308 req->in.numargs = 1;
1309 req->in.args[0].size = sizeof(inarg);
1310 req->in.args[0].value = &inarg;
1311 req->out.numargs = 1;
1312 if (fc->minor < 9)
1313 req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
1314 else
1315 req->out.args[0].size = sizeof(outarg);
1316 req->out.args[0].value = &outarg;
1317 fuse_request_send(fc, req);
1318 err = req->out.h.error;
1319 fuse_put_request(fc, req);
1320 if (err) {
1321 if (err == -EINTR)
1322 fuse_invalidate_attr(inode);
1323 goto error;
1324 }
1325
1326 if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
1327 make_bad_inode(inode);
1328 err = -EIO;
1329 goto error;
1330 }
1331
1332 spin_lock(&fc->lock);
1333 fuse_change_attributes_common(inode, &outarg.attr,
1334 attr_timeout(&outarg));
1335 oldsize = inode->i_size;
1336 i_size_write(inode, outarg.attr.size);
1337
1338 if (is_truncate) {
1339 /* NOTE: this may release/reacquire fc->lock */
1340 __fuse_release_nowrite(inode);
1341 }
1342 spin_unlock(&fc->lock);
1343
1344 /*
1345 * Only call invalidate_inode_pages2() after removing
1346 * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
1347 */
1348 if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
1349 truncate_pagecache(inode, oldsize, outarg.attr.size);
1350 invalidate_inode_pages2(inode->i_mapping);
1351 }
1352
1353 return 0;
1354
1355 error:
1356 if (is_truncate)
1357 fuse_release_nowrite(inode);
1358
1359 return err;
1360 }
1361
1362 static int fuse_setattr(struct dentry *entry, struct iattr *attr)
1363 {
1364 if (attr->ia_valid & ATTR_FILE)
1365 return fuse_do_setattr(entry, attr, attr->ia_file);
1366 else
1367 return fuse_do_setattr(entry, attr, NULL);
1368 }
1369
1370 static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
1371 struct kstat *stat)
1372 {
1373 struct inode *inode = entry->d_inode;
1374 struct fuse_conn *fc = get_fuse_conn(inode);
1375
1376 if (!fuse_allow_task(fc, current))
1377 return -EACCES;
1378
1379 return fuse_update_attributes(inode, stat, NULL, NULL);
1380 }
1381
1382 static int fuse_setxattr(struct dentry *entry, const char *name,
1383 const void *value, size_t size, int flags)
1384 {
1385 struct inode *inode = entry->d_inode;
1386 struct fuse_conn *fc = get_fuse_conn(inode);
1387 struct fuse_req *req;
1388 struct fuse_setxattr_in inarg;
1389 int err;
1390
1391 if (fc->no_setxattr)
1392 return -EOPNOTSUPP;
1393
1394 req = fuse_get_req(fc);
1395 if (IS_ERR(req))
1396 return PTR_ERR(req);
1397
1398 memset(&inarg, 0, sizeof(inarg));
1399 inarg.size = size;
1400 inarg.flags = flags;
1401 req->in.h.opcode = FUSE_SETXATTR;
1402 req->in.h.nodeid = get_node_id(inode);
1403 req->in.numargs = 3;
1404 req->in.args[0].size = sizeof(inarg);
1405 req->in.args[0].value = &inarg;
1406 req->in.args[1].size = strlen(name) + 1;
1407 req->in.args[1].value = name;
1408 req->in.args[2].size = size;
1409 req->in.args[2].value = value;
1410 fuse_request_send(fc, req);
1411 err = req->out.h.error;
1412 fuse_put_request(fc, req);
1413 if (err == -ENOSYS) {
1414 fc->no_setxattr = 1;
1415 err = -EOPNOTSUPP;
1416 }
1417 return err;
1418 }
1419
1420 static ssize_t fuse_getxattr(struct dentry *entry, const char *name,
1421 void *value, size_t size)
1422 {
1423 struct inode *inode = entry->d_inode;
1424 struct fuse_conn *fc = get_fuse_conn(inode);
1425 struct fuse_req *req;
1426 struct fuse_getxattr_in inarg;
1427 struct fuse_getxattr_out outarg;
1428 ssize_t ret;
1429
1430 if (fc->no_getxattr)
1431 return -EOPNOTSUPP;
1432
1433 req = fuse_get_req(fc);
1434 if (IS_ERR(req))
1435 return PTR_ERR(req);
1436
1437 memset(&inarg, 0, sizeof(inarg));
1438 inarg.size = size;
1439 req->in.h.opcode = FUSE_GETXATTR;
1440 req->in.h.nodeid = get_node_id(inode);
1441 req->in.numargs = 2;
1442 req->in.args[0].size = sizeof(inarg);
1443 req->in.args[0].value = &inarg;
1444 req->in.args[1].size = strlen(name) + 1;
1445 req->in.args[1].value = name;
1446 /* This is really two different operations rolled into one */
1447 req->out.numargs = 1;
1448 if (size) {
1449 req->out.argvar = 1;
1450 req->out.args[0].size = size;
1451 req->out.args[0].value = value;
1452 } else {
1453 req->out.args[0].size = sizeof(outarg);
1454 req->out.args[0].value = &outarg;
1455 }
1456 fuse_request_send(fc, req);
1457 ret = req->out.h.error;
1458 if (!ret)
1459 ret = size ? req->out.args[0].size : outarg.size;
1460 else {
1461 if (ret == -ENOSYS) {
1462 fc->no_getxattr = 1;
1463 ret = -EOPNOTSUPP;
1464 }
1465 }
1466 fuse_put_request(fc, req);
1467 return ret;
1468 }
1469
1470 static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
1471 {
1472 struct inode *inode = entry->d_inode;
1473 struct fuse_conn *fc = get_fuse_conn(inode);
1474 struct fuse_req *req;
1475 struct fuse_getxattr_in inarg;
1476 struct fuse_getxattr_out outarg;
1477 ssize_t ret;
1478
1479 if (!fuse_allow_task(fc, current))
1480 return -EACCES;
1481
1482 if (fc->no_listxattr)
1483 return -EOPNOTSUPP;
1484
1485 req = fuse_get_req(fc);
1486 if (IS_ERR(req))
1487 return PTR_ERR(req);
1488
1489 memset(&inarg, 0, sizeof(inarg));
1490 inarg.size = size;
1491 req->in.h.opcode = FUSE_LISTXATTR;
1492 req->in.h.nodeid = get_node_id(inode);
1493 req->in.numargs = 1;
1494 req->in.args[0].size = sizeof(inarg);
1495 req->in.args[0].value = &inarg;
1496 /* This is really two different operations rolled into one */
1497 req->out.numargs = 1;
1498 if (size) {
1499 req->out.argvar = 1;
1500 req->out.args[0].size = size;
1501 req->out.args[0].value = list;
1502 } else {
1503 req->out.args[0].size = sizeof(outarg);
1504 req->out.args[0].value = &outarg;
1505 }
1506 fuse_request_send(fc, req);
1507 ret = req->out.h.error;
1508 if (!ret)
1509 ret = size ? req->out.args[0].size : outarg.size;
1510 else {
1511 if (ret == -ENOSYS) {
1512 fc->no_listxattr = 1;
1513 ret = -EOPNOTSUPP;
1514 }
1515 }
1516 fuse_put_request(fc, req);
1517 return ret;
1518 }
1519
1520 static int fuse_removexattr(struct dentry *entry, const char *name)
1521 {
1522 struct inode *inode = entry->d_inode;
1523 struct fuse_conn *fc = get_fuse_conn(inode);
1524 struct fuse_req *req;
1525 int err;
1526
1527 if (fc->no_removexattr)
1528 return -EOPNOTSUPP;
1529
1530 req = fuse_get_req(fc);
1531 if (IS_ERR(req))
1532 return PTR_ERR(req);
1533
1534 req->in.h.opcode = FUSE_REMOVEXATTR;
1535 req->in.h.nodeid = get_node_id(inode);
1536 req->in.numargs = 1;
1537 req->in.args[0].size = strlen(name) + 1;
1538 req->in.args[0].value = name;
1539 fuse_request_send(fc, req);
1540 err = req->out.h.error;
1541 fuse_put_request(fc, req);
1542 if (err == -ENOSYS) {
1543 fc->no_removexattr = 1;
1544 err = -EOPNOTSUPP;
1545 }
1546 return err;
1547 }
1548
1549 static const struct inode_operations fuse_dir_inode_operations = {
1550 .lookup = fuse_lookup,
1551 .mkdir = fuse_mkdir,
1552 .symlink = fuse_symlink,
1553 .unlink = fuse_unlink,
1554 .rmdir = fuse_rmdir,
1555 .rename = fuse_rename,
1556 .link = fuse_link,
1557 .setattr = fuse_setattr,
1558 .create = fuse_create,
1559 .mknod = fuse_mknod,
1560 .permission = fuse_permission,
1561 .getattr = fuse_getattr,
1562 .setxattr = fuse_setxattr,
1563 .getxattr = fuse_getxattr,
1564 .listxattr = fuse_listxattr,
1565 .removexattr = fuse_removexattr,
1566 };
1567
1568 static const struct file_operations fuse_dir_operations = {
1569 .llseek = generic_file_llseek,
1570 .read = generic_read_dir,
1571 .readdir = fuse_readdir,
1572 .open = fuse_dir_open,
1573 .release = fuse_dir_release,
1574 .fsync = fuse_dir_fsync,
1575 };
1576
1577 static const struct inode_operations fuse_common_inode_operations = {
1578 .setattr = fuse_setattr,
1579 .permission = fuse_permission,
1580 .getattr = fuse_getattr,
1581 .setxattr = fuse_setxattr,
1582 .getxattr = fuse_getxattr,
1583 .listxattr = fuse_listxattr,
1584 .removexattr = fuse_removexattr,
1585 };
1586
1587 static const struct inode_operations fuse_symlink_inode_operations = {
1588 .setattr = fuse_setattr,
1589 .follow_link = fuse_follow_link,
1590 .put_link = fuse_put_link,
1591 .readlink = generic_readlink,
1592 .getattr = fuse_getattr,
1593 .setxattr = fuse_setxattr,
1594 .getxattr = fuse_getxattr,
1595 .listxattr = fuse_listxattr,
1596 .removexattr = fuse_removexattr,
1597 };
1598
1599 void fuse_init_common(struct inode *inode)
1600 {
1601 inode->i_op = &fuse_common_inode_operations;
1602 }
1603
1604 void fuse_init_dir(struct inode *inode)
1605 {
1606 inode->i_op = &fuse_dir_inode_operations;
1607 inode->i_fop = &fuse_dir_operations;
1608 }
1609
1610 void fuse_init_symlink(struct inode *inode)
1611 {
1612 inode->i_op = &fuse_symlink_inode_operations;
1613 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree