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[mirror_ubuntu-bionic-kernel.git] / fs / fuse / inode.c
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/slab.h>
13 #include <linux/file.h>
14 #include <linux/seq_file.h>
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/moduleparam.h>
18 #include <linux/parser.h>
19 #include <linux/statfs.h>
20 #include <linux/random.h>
21 #include <linux/sched.h>
22 #include <linux/exportfs.h>
23 #include <linux/posix_acl.h>
24 #include <linux/pid_namespace.h>
25
26 MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
27 MODULE_DESCRIPTION("Filesystem in Userspace");
28 MODULE_LICENSE("GPL");
29
30 static struct kmem_cache *fuse_inode_cachep;
31 struct list_head fuse_conn_list;
32 DEFINE_MUTEX(fuse_mutex);
33
34 static int set_global_limit(const char *val, const struct kernel_param *kp);
35
36 unsigned max_user_bgreq;
37 module_param_call(max_user_bgreq, set_global_limit, param_get_uint,
38 &max_user_bgreq, 0644);
39 __MODULE_PARM_TYPE(max_user_bgreq, "uint");
40 MODULE_PARM_DESC(max_user_bgreq,
41 "Global limit for the maximum number of backgrounded requests an "
42 "unprivileged user can set");
43
44 unsigned max_user_congthresh;
45 module_param_call(max_user_congthresh, set_global_limit, param_get_uint,
46 &max_user_congthresh, 0644);
47 __MODULE_PARM_TYPE(max_user_congthresh, "uint");
48 MODULE_PARM_DESC(max_user_congthresh,
49 "Global limit for the maximum congestion threshold an "
50 "unprivileged user can set");
51
52 #define FUSE_SUPER_MAGIC 0x65735546
53
54 #define FUSE_DEFAULT_BLKSIZE 512
55
56 /** Maximum number of outstanding background requests */
57 #define FUSE_DEFAULT_MAX_BACKGROUND 12
58
59 /** Congestion starts at 75% of maximum */
60 #define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4)
61
62 struct fuse_mount_data {
63 int fd;
64 unsigned rootmode;
65 kuid_t user_id;
66 kgid_t group_id;
67 unsigned fd_present:1;
68 unsigned rootmode_present:1;
69 unsigned user_id_present:1;
70 unsigned group_id_present:1;
71 unsigned default_permissions:1;
72 unsigned allow_other:1;
73 unsigned max_read;
74 unsigned blksize;
75 };
76
77 struct fuse_forget_link *fuse_alloc_forget(void)
78 {
79 return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL);
80 }
81
82 static struct inode *fuse_alloc_inode(struct super_block *sb)
83 {
84 struct inode *inode;
85 struct fuse_inode *fi;
86
87 inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL);
88 if (!inode)
89 return NULL;
90
91 fi = get_fuse_inode(inode);
92 fi->i_time = 0;
93 fi->nodeid = 0;
94 fi->nlookup = 0;
95 fi->attr_version = 0;
96 fi->writectr = 0;
97 fi->orig_ino = 0;
98 fi->state = 0;
99 INIT_LIST_HEAD(&fi->write_files);
100 INIT_LIST_HEAD(&fi->queued_writes);
101 INIT_LIST_HEAD(&fi->writepages);
102 init_waitqueue_head(&fi->page_waitq);
103 mutex_init(&fi->mutex);
104 fi->forget = fuse_alloc_forget();
105 if (!fi->forget) {
106 kmem_cache_free(fuse_inode_cachep, inode);
107 return NULL;
108 }
109
110 return inode;
111 }
112
113 static void fuse_i_callback(struct rcu_head *head)
114 {
115 struct inode *inode = container_of(head, struct inode, i_rcu);
116 kmem_cache_free(fuse_inode_cachep, inode);
117 }
118
119 static void fuse_destroy_inode(struct inode *inode)
120 {
121 struct fuse_inode *fi = get_fuse_inode(inode);
122 BUG_ON(!list_empty(&fi->write_files));
123 BUG_ON(!list_empty(&fi->queued_writes));
124 mutex_destroy(&fi->mutex);
125 kfree(fi->forget);
126 call_rcu(&inode->i_rcu, fuse_i_callback);
127 }
128
129 static void fuse_evict_inode(struct inode *inode)
130 {
131 truncate_inode_pages_final(&inode->i_data);
132 clear_inode(inode);
133 if (inode->i_sb->s_flags & SB_ACTIVE) {
134 struct fuse_conn *fc = get_fuse_conn(inode);
135 struct fuse_inode *fi = get_fuse_inode(inode);
136 fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup);
137 fi->forget = NULL;
138 }
139 }
140
141 static int fuse_remount_fs(struct super_block *sb, int *flags, char *data)
142 {
143 sync_filesystem(sb);
144 if (*flags & SB_MANDLOCK)
145 return -EINVAL;
146
147 return 0;
148 }
149
150 /*
151 * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down
152 * so that it will fit.
153 */
154 static ino_t fuse_squash_ino(u64 ino64)
155 {
156 ino_t ino = (ino_t) ino64;
157 if (sizeof(ino_t) < sizeof(u64))
158 ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8;
159 return ino;
160 }
161
162 void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
163 u64 attr_valid)
164 {
165 struct fuse_conn *fc = get_fuse_conn(inode);
166 struct fuse_inode *fi = get_fuse_inode(inode);
167
168 fi->attr_version = ++fc->attr_version;
169 fi->i_time = attr_valid;
170
171 inode->i_ino = fuse_squash_ino(attr->ino);
172 inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
173 set_nlink(inode, attr->nlink);
174 inode->i_uid = make_kuid(fc->user_ns, attr->uid);
175 inode->i_gid = make_kgid(fc->user_ns, attr->gid);
176 inode->i_blocks = attr->blocks;
177 inode->i_atime.tv_sec = attr->atime;
178 inode->i_atime.tv_nsec = attr->atimensec;
179 /* mtime from server may be stale due to local buffered write */
180 if (!fc->writeback_cache || !S_ISREG(inode->i_mode)) {
181 inode->i_mtime.tv_sec = attr->mtime;
182 inode->i_mtime.tv_nsec = attr->mtimensec;
183 inode->i_ctime.tv_sec = attr->ctime;
184 inode->i_ctime.tv_nsec = attr->ctimensec;
185 }
186
187 if (attr->blksize != 0)
188 inode->i_blkbits = ilog2(attr->blksize);
189 else
190 inode->i_blkbits = inode->i_sb->s_blocksize_bits;
191
192 /*
193 * Don't set the sticky bit in i_mode, unless we want the VFS
194 * to check permissions. This prevents failures due to the
195 * check in may_delete().
196 */
197 fi->orig_i_mode = inode->i_mode;
198 if (!fc->default_permissions)
199 inode->i_mode &= ~S_ISVTX;
200
201 fi->orig_ino = attr->ino;
202 }
203
204 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
205 u64 attr_valid, u64 attr_version)
206 {
207 struct fuse_conn *fc = get_fuse_conn(inode);
208 struct fuse_inode *fi = get_fuse_inode(inode);
209 bool is_wb = fc->writeback_cache;
210 loff_t oldsize;
211 struct timespec old_mtime;
212
213 spin_lock(&fc->lock);
214 if ((attr_version != 0 && fi->attr_version > attr_version) ||
215 test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) {
216 spin_unlock(&fc->lock);
217 return;
218 }
219
220 old_mtime = inode->i_mtime;
221 fuse_change_attributes_common(inode, attr, attr_valid);
222
223 oldsize = inode->i_size;
224 /*
225 * In case of writeback_cache enabled, the cached writes beyond EOF
226 * extend local i_size without keeping userspace server in sync. So,
227 * attr->size coming from server can be stale. We cannot trust it.
228 */
229 if (!is_wb || !S_ISREG(inode->i_mode))
230 i_size_write(inode, attr->size);
231 spin_unlock(&fc->lock);
232
233 if (!is_wb && S_ISREG(inode->i_mode)) {
234 bool inval = false;
235
236 if (oldsize != attr->size) {
237 truncate_pagecache(inode, attr->size);
238 inval = true;
239 } else if (fc->auto_inval_data) {
240 struct timespec new_mtime = {
241 .tv_sec = attr->mtime,
242 .tv_nsec = attr->mtimensec,
243 };
244
245 /*
246 * Auto inval mode also checks and invalidates if mtime
247 * has changed.
248 */
249 if (!timespec_equal(&old_mtime, &new_mtime))
250 inval = true;
251 }
252
253 if (inval)
254 invalidate_inode_pages2(inode->i_mapping);
255 }
256 }
257
258 static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
259 {
260 inode->i_mode = attr->mode & S_IFMT;
261 inode->i_size = attr->size;
262 inode->i_mtime.tv_sec = attr->mtime;
263 inode->i_mtime.tv_nsec = attr->mtimensec;
264 inode->i_ctime.tv_sec = attr->ctime;
265 inode->i_ctime.tv_nsec = attr->ctimensec;
266 if (S_ISREG(inode->i_mode)) {
267 fuse_init_common(inode);
268 fuse_init_file_inode(inode);
269 } else if (S_ISDIR(inode->i_mode))
270 fuse_init_dir(inode);
271 else if (S_ISLNK(inode->i_mode))
272 fuse_init_symlink(inode);
273 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
274 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
275 fuse_init_common(inode);
276 init_special_inode(inode, inode->i_mode,
277 new_decode_dev(attr->rdev));
278 } else
279 BUG();
280 }
281
282 int fuse_inode_eq(struct inode *inode, void *_nodeidp)
283 {
284 u64 nodeid = *(u64 *) _nodeidp;
285 if (get_node_id(inode) == nodeid)
286 return 1;
287 else
288 return 0;
289 }
290
291 static int fuse_inode_set(struct inode *inode, void *_nodeidp)
292 {
293 u64 nodeid = *(u64 *) _nodeidp;
294 get_fuse_inode(inode)->nodeid = nodeid;
295 return 0;
296 }
297
298 struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
299 int generation, struct fuse_attr *attr,
300 u64 attr_valid, u64 attr_version)
301 {
302 struct inode *inode;
303 struct fuse_inode *fi;
304 struct fuse_conn *fc = get_fuse_conn_super(sb);
305
306 retry:
307 inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
308 if (!inode)
309 return NULL;
310
311 if ((inode->i_state & I_NEW)) {
312 inode->i_flags |= S_NOATIME;
313 if (!fc->writeback_cache || !S_ISREG(attr->mode))
314 inode->i_flags |= S_NOCMTIME;
315 inode->i_generation = generation;
316 fuse_init_inode(inode, attr);
317 unlock_new_inode(inode);
318 } else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
319 /* Inode has changed type, any I/O on the old should fail */
320 make_bad_inode(inode);
321 iput(inode);
322 goto retry;
323 }
324
325 fi = get_fuse_inode(inode);
326 spin_lock(&fc->lock);
327 fi->nlookup++;
328 spin_unlock(&fc->lock);
329 fuse_change_attributes(inode, attr, attr_valid, attr_version);
330
331 return inode;
332 }
333
334 int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
335 loff_t offset, loff_t len)
336 {
337 struct inode *inode;
338 pgoff_t pg_start;
339 pgoff_t pg_end;
340
341 inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid);
342 if (!inode)
343 return -ENOENT;
344
345 fuse_invalidate_attr(inode);
346 forget_all_cached_acls(inode);
347 if (offset >= 0) {
348 pg_start = offset >> PAGE_SHIFT;
349 if (len <= 0)
350 pg_end = -1;
351 else
352 pg_end = (offset + len - 1) >> PAGE_SHIFT;
353 invalidate_inode_pages2_range(inode->i_mapping,
354 pg_start, pg_end);
355 }
356 iput(inode);
357 return 0;
358 }
359
360 bool fuse_lock_inode(struct inode *inode)
361 {
362 bool locked = false;
363
364 if (!get_fuse_conn(inode)->parallel_dirops) {
365 mutex_lock(&get_fuse_inode(inode)->mutex);
366 locked = true;
367 }
368
369 return locked;
370 }
371
372 void fuse_unlock_inode(struct inode *inode, bool locked)
373 {
374 if (locked)
375 mutex_unlock(&get_fuse_inode(inode)->mutex);
376 }
377
378 static void fuse_umount_begin(struct super_block *sb)
379 {
380 fuse_abort_conn(get_fuse_conn_super(sb));
381 }
382
383 static void fuse_send_destroy(struct fuse_conn *fc)
384 {
385 struct fuse_req *req = fc->destroy_req;
386 if (req && fc->conn_init) {
387 fc->destroy_req = NULL;
388 req->in.h.opcode = FUSE_DESTROY;
389 __set_bit(FR_FORCE, &req->flags);
390 __clear_bit(FR_BACKGROUND, &req->flags);
391 fuse_request_send(fc, req);
392 fuse_put_request(fc, req);
393 }
394 }
395
396 static void fuse_put_super(struct super_block *sb)
397 {
398 struct fuse_conn *fc = get_fuse_conn_super(sb);
399
400 fuse_send_destroy(fc);
401
402 fuse_abort_conn(fc);
403 fuse_wait_aborted(fc);
404
405 mutex_lock(&fuse_mutex);
406 list_del(&fc->entry);
407 fuse_ctl_remove_conn(fc);
408 mutex_unlock(&fuse_mutex);
409
410 fuse_conn_put(fc);
411 }
412
413 static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
414 {
415 stbuf->f_type = FUSE_SUPER_MAGIC;
416 stbuf->f_bsize = attr->bsize;
417 stbuf->f_frsize = attr->frsize;
418 stbuf->f_blocks = attr->blocks;
419 stbuf->f_bfree = attr->bfree;
420 stbuf->f_bavail = attr->bavail;
421 stbuf->f_files = attr->files;
422 stbuf->f_ffree = attr->ffree;
423 stbuf->f_namelen = attr->namelen;
424 /* fsid is left zero */
425 }
426
427 static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
428 {
429 struct super_block *sb = dentry->d_sb;
430 struct fuse_conn *fc = get_fuse_conn_super(sb);
431 FUSE_ARGS(args);
432 struct fuse_statfs_out outarg;
433 int err;
434
435 if (!fuse_allow_current_process(fc)) {
436 buf->f_type = FUSE_SUPER_MAGIC;
437 return 0;
438 }
439
440 memset(&outarg, 0, sizeof(outarg));
441 args.in.numargs = 0;
442 args.in.h.opcode = FUSE_STATFS;
443 args.in.h.nodeid = get_node_id(d_inode(dentry));
444 args.out.numargs = 1;
445 args.out.args[0].size = sizeof(outarg);
446 args.out.args[0].value = &outarg;
447 err = fuse_simple_request(fc, &args);
448 if (!err)
449 convert_fuse_statfs(buf, &outarg.st);
450 return err;
451 }
452
453 enum {
454 OPT_FD,
455 OPT_ROOTMODE,
456 OPT_USER_ID,
457 OPT_GROUP_ID,
458 OPT_DEFAULT_PERMISSIONS,
459 OPT_ALLOW_OTHER,
460 OPT_MAX_READ,
461 OPT_BLKSIZE,
462 OPT_ERR
463 };
464
465 static const match_table_t tokens = {
466 {OPT_FD, "fd=%u"},
467 {OPT_ROOTMODE, "rootmode=%o"},
468 {OPT_USER_ID, "user_id=%u"},
469 {OPT_GROUP_ID, "group_id=%u"},
470 {OPT_DEFAULT_PERMISSIONS, "default_permissions"},
471 {OPT_ALLOW_OTHER, "allow_other"},
472 {OPT_MAX_READ, "max_read=%u"},
473 {OPT_BLKSIZE, "blksize=%u"},
474 {OPT_ERR, NULL}
475 };
476
477 static int fuse_match_uint(substring_t *s, unsigned int *res)
478 {
479 int err = -ENOMEM;
480 char *buf = match_strdup(s);
481 if (buf) {
482 err = kstrtouint(buf, 10, res);
483 kfree(buf);
484 }
485 return err;
486 }
487
488 static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev,
489 struct user_namespace *user_ns)
490 {
491 char *p;
492 memset(d, 0, sizeof(struct fuse_mount_data));
493 d->max_read = ~0;
494 d->blksize = FUSE_DEFAULT_BLKSIZE;
495
496 while ((p = strsep(&opt, ",")) != NULL) {
497 int token;
498 int value;
499 unsigned uv;
500 substring_t args[MAX_OPT_ARGS];
501 if (!*p)
502 continue;
503
504 token = match_token(p, tokens, args);
505 switch (token) {
506 case OPT_FD:
507 if (match_int(&args[0], &value))
508 return 0;
509 d->fd = value;
510 d->fd_present = 1;
511 break;
512
513 case OPT_ROOTMODE:
514 if (match_octal(&args[0], &value))
515 return 0;
516 if (!fuse_valid_type(value))
517 return 0;
518 d->rootmode = value;
519 d->rootmode_present = 1;
520 break;
521
522 case OPT_USER_ID:
523 if (fuse_match_uint(&args[0], &uv))
524 return 0;
525 d->user_id = make_kuid(user_ns, uv);
526 if (!uid_valid(d->user_id))
527 return 0;
528 d->user_id_present = 1;
529 break;
530
531 case OPT_GROUP_ID:
532 if (fuse_match_uint(&args[0], &uv))
533 return 0;
534 d->group_id = make_kgid(user_ns, uv);
535 if (!gid_valid(d->group_id))
536 return 0;
537 d->group_id_present = 1;
538 break;
539
540 case OPT_DEFAULT_PERMISSIONS:
541 d->default_permissions = 1;
542 break;
543
544 case OPT_ALLOW_OTHER:
545 d->allow_other = 1;
546 break;
547
548 case OPT_MAX_READ:
549 if (match_int(&args[0], &value))
550 return 0;
551 d->max_read = value;
552 break;
553
554 case OPT_BLKSIZE:
555 if (!is_bdev || match_int(&args[0], &value))
556 return 0;
557 d->blksize = value;
558 break;
559
560 default:
561 return 0;
562 }
563 }
564
565 if (!d->fd_present || !d->rootmode_present ||
566 !d->user_id_present || !d->group_id_present)
567 return 0;
568
569 return 1;
570 }
571
572 static int fuse_show_options(struct seq_file *m, struct dentry *root)
573 {
574 struct super_block *sb = root->d_sb;
575 struct fuse_conn *fc = get_fuse_conn_super(sb);
576
577 seq_printf(m, ",user_id=%u", from_kuid_munged(fc->user_ns, fc->user_id));
578 seq_printf(m, ",group_id=%u", from_kgid_munged(fc->user_ns, fc->group_id));
579 if (fc->default_permissions)
580 seq_puts(m, ",default_permissions");
581 if (fc->allow_other)
582 seq_puts(m, ",allow_other");
583 if (fc->max_read != ~0)
584 seq_printf(m, ",max_read=%u", fc->max_read);
585 if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
586 seq_printf(m, ",blksize=%lu", sb->s_blocksize);
587 return 0;
588 }
589
590 static void fuse_iqueue_init(struct fuse_iqueue *fiq)
591 {
592 memset(fiq, 0, sizeof(struct fuse_iqueue));
593 init_waitqueue_head(&fiq->waitq);
594 INIT_LIST_HEAD(&fiq->pending);
595 INIT_LIST_HEAD(&fiq->interrupts);
596 fiq->forget_list_tail = &fiq->forget_list_head;
597 fiq->connected = 1;
598 }
599
600 static void fuse_pqueue_init(struct fuse_pqueue *fpq)
601 {
602 memset(fpq, 0, sizeof(struct fuse_pqueue));
603 spin_lock_init(&fpq->lock);
604 INIT_LIST_HEAD(&fpq->processing);
605 INIT_LIST_HEAD(&fpq->io);
606 fpq->connected = 1;
607 }
608
609 void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns)
610 {
611 memset(fc, 0, sizeof(*fc));
612 spin_lock_init(&fc->lock);
613 init_rwsem(&fc->killsb);
614 refcount_set(&fc->count, 1);
615 atomic_set(&fc->dev_count, 1);
616 init_waitqueue_head(&fc->blocked_waitq);
617 init_waitqueue_head(&fc->reserved_req_waitq);
618 fuse_iqueue_init(&fc->iq);
619 INIT_LIST_HEAD(&fc->bg_queue);
620 INIT_LIST_HEAD(&fc->entry);
621 INIT_LIST_HEAD(&fc->devices);
622 atomic_set(&fc->num_waiting, 0);
623 fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND;
624 fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD;
625 fc->khctr = 0;
626 fc->polled_files = RB_ROOT;
627 fc->blocked = 0;
628 fc->initialized = 0;
629 fc->connected = 1;
630 fc->attr_version = 1;
631 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
632 fc->pid_ns = get_pid_ns(task_active_pid_ns(current));
633 fc->user_ns = get_user_ns(user_ns);
634 }
635 EXPORT_SYMBOL_GPL(fuse_conn_init);
636
637 void fuse_conn_put(struct fuse_conn *fc)
638 {
639 if (refcount_dec_and_test(&fc->count)) {
640 if (fc->destroy_req)
641 fuse_request_free(fc->destroy_req);
642 put_pid_ns(fc->pid_ns);
643 put_user_ns(fc->user_ns);
644 fc->release(fc);
645 }
646 }
647 EXPORT_SYMBOL_GPL(fuse_conn_put);
648
649 struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)
650 {
651 refcount_inc(&fc->count);
652 return fc;
653 }
654 EXPORT_SYMBOL_GPL(fuse_conn_get);
655
656 static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode)
657 {
658 struct fuse_attr attr;
659 memset(&attr, 0, sizeof(attr));
660
661 attr.mode = mode;
662 attr.ino = FUSE_ROOT_ID;
663 attr.nlink = 1;
664 return fuse_iget(sb, 1, 0, &attr, 0, 0);
665 }
666
667 struct fuse_inode_handle {
668 u64 nodeid;
669 u32 generation;
670 };
671
672 static struct dentry *fuse_get_dentry(struct super_block *sb,
673 struct fuse_inode_handle *handle)
674 {
675 struct fuse_conn *fc = get_fuse_conn_super(sb);
676 struct inode *inode;
677 struct dentry *entry;
678 int err = -ESTALE;
679
680 if (handle->nodeid == 0)
681 goto out_err;
682
683 inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid);
684 if (!inode) {
685 struct fuse_entry_out outarg;
686 const struct qstr name = QSTR_INIT(".", 1);
687
688 if (!fc->export_support)
689 goto out_err;
690
691 err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg,
692 &inode);
693 if (err && err != -ENOENT)
694 goto out_err;
695 if (err || !inode) {
696 err = -ESTALE;
697 goto out_err;
698 }
699 err = -EIO;
700 if (get_node_id(inode) != handle->nodeid)
701 goto out_iput;
702 }
703 err = -ESTALE;
704 if (inode->i_generation != handle->generation)
705 goto out_iput;
706
707 entry = d_obtain_alias(inode);
708 if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID)
709 fuse_invalidate_entry_cache(entry);
710
711 return entry;
712
713 out_iput:
714 iput(inode);
715 out_err:
716 return ERR_PTR(err);
717 }
718
719 static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len,
720 struct inode *parent)
721 {
722 int len = parent ? 6 : 3;
723 u64 nodeid;
724 u32 generation;
725
726 if (*max_len < len) {
727 *max_len = len;
728 return FILEID_INVALID;
729 }
730
731 nodeid = get_fuse_inode(inode)->nodeid;
732 generation = inode->i_generation;
733
734 fh[0] = (u32)(nodeid >> 32);
735 fh[1] = (u32)(nodeid & 0xffffffff);
736 fh[2] = generation;
737
738 if (parent) {
739 nodeid = get_fuse_inode(parent)->nodeid;
740 generation = parent->i_generation;
741
742 fh[3] = (u32)(nodeid >> 32);
743 fh[4] = (u32)(nodeid & 0xffffffff);
744 fh[5] = generation;
745 }
746
747 *max_len = len;
748 return parent ? 0x82 : 0x81;
749 }
750
751 static struct dentry *fuse_fh_to_dentry(struct super_block *sb,
752 struct fid *fid, int fh_len, int fh_type)
753 {
754 struct fuse_inode_handle handle;
755
756 if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3)
757 return NULL;
758
759 handle.nodeid = (u64) fid->raw[0] << 32;
760 handle.nodeid |= (u64) fid->raw[1];
761 handle.generation = fid->raw[2];
762 return fuse_get_dentry(sb, &handle);
763 }
764
765 static struct dentry *fuse_fh_to_parent(struct super_block *sb,
766 struct fid *fid, int fh_len, int fh_type)
767 {
768 struct fuse_inode_handle parent;
769
770 if (fh_type != 0x82 || fh_len < 6)
771 return NULL;
772
773 parent.nodeid = (u64) fid->raw[3] << 32;
774 parent.nodeid |= (u64) fid->raw[4];
775 parent.generation = fid->raw[5];
776 return fuse_get_dentry(sb, &parent);
777 }
778
779 static struct dentry *fuse_get_parent(struct dentry *child)
780 {
781 struct inode *child_inode = d_inode(child);
782 struct fuse_conn *fc = get_fuse_conn(child_inode);
783 struct inode *inode;
784 struct dentry *parent;
785 struct fuse_entry_out outarg;
786 const struct qstr name = QSTR_INIT("..", 2);
787 int err;
788
789 if (!fc->export_support)
790 return ERR_PTR(-ESTALE);
791
792 err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode),
793 &name, &outarg, &inode);
794 if (err) {
795 if (err == -ENOENT)
796 return ERR_PTR(-ESTALE);
797 return ERR_PTR(err);
798 }
799
800 parent = d_obtain_alias(inode);
801 if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID)
802 fuse_invalidate_entry_cache(parent);
803
804 return parent;
805 }
806
807 static const struct export_operations fuse_export_operations = {
808 .fh_to_dentry = fuse_fh_to_dentry,
809 .fh_to_parent = fuse_fh_to_parent,
810 .encode_fh = fuse_encode_fh,
811 .get_parent = fuse_get_parent,
812 };
813
814 static const struct super_operations fuse_super_operations = {
815 .alloc_inode = fuse_alloc_inode,
816 .destroy_inode = fuse_destroy_inode,
817 .evict_inode = fuse_evict_inode,
818 .write_inode = fuse_write_inode,
819 .drop_inode = generic_delete_inode,
820 .remount_fs = fuse_remount_fs,
821 .put_super = fuse_put_super,
822 .umount_begin = fuse_umount_begin,
823 .statfs = fuse_statfs,
824 .show_options = fuse_show_options,
825 };
826
827 static void sanitize_global_limit(unsigned *limit)
828 {
829 if (*limit == 0)
830 *limit = ((totalram_pages << PAGE_SHIFT) >> 13) /
831 sizeof(struct fuse_req);
832
833 if (*limit >= 1 << 16)
834 *limit = (1 << 16) - 1;
835 }
836
837 static int set_global_limit(const char *val, const struct kernel_param *kp)
838 {
839 int rv;
840
841 rv = param_set_uint(val, kp);
842 if (rv)
843 return rv;
844
845 sanitize_global_limit((unsigned *)kp->arg);
846
847 return 0;
848 }
849
850 static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg)
851 {
852 int cap_sys_admin = capable(CAP_SYS_ADMIN);
853
854 if (arg->minor < 13)
855 return;
856
857 sanitize_global_limit(&max_user_bgreq);
858 sanitize_global_limit(&max_user_congthresh);
859
860 if (arg->max_background) {
861 fc->max_background = arg->max_background;
862
863 if (!cap_sys_admin && fc->max_background > max_user_bgreq)
864 fc->max_background = max_user_bgreq;
865 }
866 if (arg->congestion_threshold) {
867 fc->congestion_threshold = arg->congestion_threshold;
868
869 if (!cap_sys_admin &&
870 fc->congestion_threshold > max_user_congthresh)
871 fc->congestion_threshold = max_user_congthresh;
872 }
873 }
874
875 static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
876 {
877 struct fuse_init_out *arg = &req->misc.init_out;
878
879 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
880 fc->conn_error = 1;
881 else {
882 unsigned long ra_pages;
883
884 process_init_limits(fc, arg);
885
886 if (arg->minor >= 6) {
887 ra_pages = arg->max_readahead / PAGE_SIZE;
888 if (arg->flags & FUSE_ASYNC_READ)
889 fc->async_read = 1;
890 if (!(arg->flags & FUSE_POSIX_LOCKS))
891 fc->no_lock = 1;
892 if (arg->minor >= 17) {
893 if (!(arg->flags & FUSE_FLOCK_LOCKS))
894 fc->no_flock = 1;
895 } else {
896 if (!(arg->flags & FUSE_POSIX_LOCKS))
897 fc->no_flock = 1;
898 }
899 if (arg->flags & FUSE_ATOMIC_O_TRUNC)
900 fc->atomic_o_trunc = 1;
901 if (arg->minor >= 9) {
902 /* LOOKUP has dependency on proto version */
903 if (arg->flags & FUSE_EXPORT_SUPPORT)
904 fc->export_support = 1;
905 }
906 if (arg->flags & FUSE_BIG_WRITES)
907 fc->big_writes = 1;
908 if (arg->flags & FUSE_DONT_MASK)
909 fc->dont_mask = 1;
910 if (arg->flags & FUSE_AUTO_INVAL_DATA)
911 fc->auto_inval_data = 1;
912 if (arg->flags & FUSE_DO_READDIRPLUS) {
913 fc->do_readdirplus = 1;
914 if (arg->flags & FUSE_READDIRPLUS_AUTO)
915 fc->readdirplus_auto = 1;
916 }
917 if (arg->flags & FUSE_ASYNC_DIO)
918 fc->async_dio = 1;
919 if (arg->flags & FUSE_WRITEBACK_CACHE)
920 fc->writeback_cache = 1;
921 if (arg->flags & FUSE_PARALLEL_DIROPS)
922 fc->parallel_dirops = 1;
923 if (arg->flags & FUSE_HANDLE_KILLPRIV)
924 fc->handle_killpriv = 1;
925 if (arg->time_gran && arg->time_gran <= 1000000000)
926 fc->sb->s_time_gran = arg->time_gran;
927 if ((arg->flags & FUSE_POSIX_ACL)) {
928 fc->default_permissions = 1;
929 fc->posix_acl = 1;
930 fc->sb->s_xattr = fuse_acl_xattr_handlers;
931 }
932 } else {
933 ra_pages = fc->max_read / PAGE_SIZE;
934 fc->no_lock = 1;
935 fc->no_flock = 1;
936 }
937
938 fc->sb->s_bdi->ra_pages =
939 min(fc->sb->s_bdi->ra_pages, ra_pages);
940 fc->minor = arg->minor;
941 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
942 fc->max_write = max_t(unsigned, 4096, fc->max_write);
943 fc->conn_init = 1;
944 }
945 fuse_set_initialized(fc);
946 wake_up_all(&fc->blocked_waitq);
947 }
948
949 static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
950 {
951 struct fuse_init_in *arg = &req->misc.init_in;
952
953 arg->major = FUSE_KERNEL_VERSION;
954 arg->minor = FUSE_KERNEL_MINOR_VERSION;
955 arg->max_readahead = fc->sb->s_bdi->ra_pages * PAGE_SIZE;
956 arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
957 FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK |
958 FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ |
959 FUSE_FLOCK_LOCKS | FUSE_HAS_IOCTL_DIR | FUSE_AUTO_INVAL_DATA |
960 FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO |
961 FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT |
962 FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL;
963 req->in.h.opcode = FUSE_INIT;
964 req->in.numargs = 1;
965 req->in.args[0].size = sizeof(*arg);
966 req->in.args[0].value = arg;
967 req->out.numargs = 1;
968 /* Variable length argument used for backward compatibility
969 with interface version < 7.5. Rest of init_out is zeroed
970 by do_get_request(), so a short reply is not a problem */
971 req->out.argvar = 1;
972 req->out.args[0].size = sizeof(struct fuse_init_out);
973 req->out.args[0].value = &req->misc.init_out;
974 req->end = process_init_reply;
975 fuse_request_send_background(fc, req);
976 }
977
978 static void fuse_free_conn(struct fuse_conn *fc)
979 {
980 WARN_ON(!list_empty(&fc->devices));
981 kfree_rcu(fc, rcu);
982 }
983
984 static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
985 {
986 int err;
987 char *suffix = "";
988
989 if (sb->s_bdev) {
990 suffix = "-fuseblk";
991 /*
992 * sb->s_bdi points to blkdev's bdi however we want to redirect
993 * it to our private bdi...
994 */
995 bdi_put(sb->s_bdi);
996 sb->s_bdi = &noop_backing_dev_info;
997 }
998 err = super_setup_bdi_name(sb, "%u:%u%s", MAJOR(fc->dev),
999 MINOR(fc->dev), suffix);
1000 if (err)
1001 return err;
1002
1003 sb->s_bdi->ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_SIZE;
1004 /* fuse does it's own writeback accounting */
1005 sb->s_bdi->capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT;
1006
1007 /*
1008 * For a single fuse filesystem use max 1% of dirty +
1009 * writeback threshold.
1010 *
1011 * This gives about 1M of write buffer for memory maps on a
1012 * machine with 1G and 10% dirty_ratio, which should be more
1013 * than enough.
1014 *
1015 * Privileged users can raise it by writing to
1016 *
1017 * /sys/class/bdi/<bdi>/max_ratio
1018 */
1019 bdi_set_max_ratio(sb->s_bdi, 1);
1020
1021 return 0;
1022 }
1023
1024 struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc)
1025 {
1026 struct fuse_dev *fud;
1027
1028 fud = kzalloc(sizeof(struct fuse_dev), GFP_KERNEL);
1029 if (fud) {
1030 fud->fc = fuse_conn_get(fc);
1031 fuse_pqueue_init(&fud->pq);
1032
1033 spin_lock(&fc->lock);
1034 list_add_tail(&fud->entry, &fc->devices);
1035 spin_unlock(&fc->lock);
1036 }
1037
1038 return fud;
1039 }
1040 EXPORT_SYMBOL_GPL(fuse_dev_alloc);
1041
1042 void fuse_dev_free(struct fuse_dev *fud)
1043 {
1044 struct fuse_conn *fc = fud->fc;
1045
1046 if (fc) {
1047 spin_lock(&fc->lock);
1048 list_del(&fud->entry);
1049 spin_unlock(&fc->lock);
1050
1051 fuse_conn_put(fc);
1052 }
1053 kfree(fud);
1054 }
1055 EXPORT_SYMBOL_GPL(fuse_dev_free);
1056
1057 static int fuse_fill_super(struct super_block *sb, void *data, int silent)
1058 {
1059 struct fuse_dev *fud;
1060 struct fuse_conn *fc;
1061 struct inode *root;
1062 struct fuse_mount_data d;
1063 struct file *file;
1064 struct dentry *root_dentry;
1065 struct fuse_req *init_req;
1066 int err;
1067 int is_bdev = sb->s_bdev != NULL;
1068
1069 err = -EINVAL;
1070 if (sb->s_flags & SB_MANDLOCK)
1071 goto err;
1072
1073 sb->s_flags &= ~(SB_NOSEC | SB_I_VERSION);
1074
1075 if (!parse_fuse_opt(data, &d, is_bdev, sb->s_user_ns))
1076 goto err;
1077
1078 if (is_bdev) {
1079 #ifdef CONFIG_BLOCK
1080 err = -EINVAL;
1081 if (!sb_set_blocksize(sb, d.blksize))
1082 goto err;
1083 #endif
1084 } else {
1085 sb->s_blocksize = PAGE_SIZE;
1086 sb->s_blocksize_bits = PAGE_SHIFT;
1087 }
1088 sb->s_magic = FUSE_SUPER_MAGIC;
1089 sb->s_op = &fuse_super_operations;
1090 sb->s_xattr = fuse_xattr_handlers;
1091 sb->s_maxbytes = MAX_LFS_FILESIZE;
1092 sb->s_time_gran = 1;
1093 sb->s_export_op = &fuse_export_operations;
1094
1095 file = fget(d.fd);
1096 err = -EINVAL;
1097 if (!file)
1098 goto err;
1099
1100 /*
1101 * Require mount to happen from the same user namespace which
1102 * opened /dev/fuse to prevent potential attacks.
1103 */
1104 if (file->f_op != &fuse_dev_operations ||
1105 file->f_cred->user_ns != sb->s_user_ns)
1106 goto err_fput;
1107
1108 fc = kmalloc(sizeof(*fc), GFP_KERNEL);
1109 err = -ENOMEM;
1110 if (!fc)
1111 goto err_fput;
1112
1113 fuse_conn_init(fc, sb->s_user_ns);
1114 fc->release = fuse_free_conn;
1115
1116 fud = fuse_dev_alloc(fc);
1117 if (!fud)
1118 goto err_put_conn;
1119
1120 fc->dev = sb->s_dev;
1121 fc->sb = sb;
1122 err = fuse_bdi_init(fc, sb);
1123 if (err)
1124 goto err_dev_free;
1125
1126 /* Handle umasking inside the fuse code */
1127 if (sb->s_flags & SB_POSIXACL)
1128 fc->dont_mask = 1;
1129 sb->s_flags |= SB_POSIXACL;
1130
1131 fc->default_permissions = d.default_permissions;
1132 fc->allow_other = d.allow_other;
1133 fc->user_id = d.user_id;
1134 fc->group_id = d.group_id;
1135 fc->max_read = max_t(unsigned, 4096, d.max_read);
1136
1137 /* Used by get_root_inode() */
1138 sb->s_fs_info = fc;
1139
1140 err = -ENOMEM;
1141 root = fuse_get_root_inode(sb, d.rootmode);
1142 sb->s_d_op = &fuse_root_dentry_operations;
1143 root_dentry = d_make_root(root);
1144 if (!root_dentry)
1145 goto err_dev_free;
1146 /* Root dentry doesn't have .d_revalidate */
1147 sb->s_d_op = &fuse_dentry_operations;
1148
1149 init_req = fuse_request_alloc(0);
1150 if (!init_req)
1151 goto err_put_root;
1152 __set_bit(FR_BACKGROUND, &init_req->flags);
1153
1154 if (is_bdev) {
1155 fc->destroy_req = fuse_request_alloc(0);
1156 if (!fc->destroy_req)
1157 goto err_free_init_req;
1158 }
1159
1160 mutex_lock(&fuse_mutex);
1161 err = -EINVAL;
1162 if (file->private_data)
1163 goto err_unlock;
1164
1165 err = fuse_ctl_add_conn(fc);
1166 if (err)
1167 goto err_unlock;
1168
1169 list_add_tail(&fc->entry, &fuse_conn_list);
1170 sb->s_root = root_dentry;
1171 file->private_data = fud;
1172 mutex_unlock(&fuse_mutex);
1173 /*
1174 * atomic_dec_and_test() in fput() provides the necessary
1175 * memory barrier for file->private_data to be visible on all
1176 * CPUs after this
1177 */
1178 fput(file);
1179
1180 fuse_send_init(fc, init_req);
1181
1182 return 0;
1183
1184 err_unlock:
1185 mutex_unlock(&fuse_mutex);
1186 err_free_init_req:
1187 fuse_request_free(init_req);
1188 err_put_root:
1189 dput(root_dentry);
1190 err_dev_free:
1191 fuse_dev_free(fud);
1192 err_put_conn:
1193 fuse_conn_put(fc);
1194 sb->s_fs_info = NULL;
1195 err_fput:
1196 fput(file);
1197 err:
1198 return err;
1199 }
1200
1201 static struct dentry *fuse_mount(struct file_system_type *fs_type,
1202 int flags, const char *dev_name,
1203 void *raw_data)
1204 {
1205 return mount_nodev(fs_type, flags, raw_data, fuse_fill_super);
1206 }
1207
1208 static void fuse_kill_sb_anon(struct super_block *sb)
1209 {
1210 struct fuse_conn *fc = get_fuse_conn_super(sb);
1211
1212 if (fc) {
1213 down_write(&fc->killsb);
1214 fc->sb = NULL;
1215 up_write(&fc->killsb);
1216 }
1217
1218 kill_anon_super(sb);
1219 }
1220
1221 static struct file_system_type fuse_fs_type = {
1222 .owner = THIS_MODULE,
1223 .name = "fuse",
1224 .fs_flags = FS_HAS_SUBTYPE | FS_USERNS_MOUNT,
1225 .mount = fuse_mount,
1226 .kill_sb = fuse_kill_sb_anon,
1227 };
1228 MODULE_ALIAS_FS("fuse");
1229
1230 #ifdef CONFIG_BLOCK
1231 static struct dentry *fuse_mount_blk(struct file_system_type *fs_type,
1232 int flags, const char *dev_name,
1233 void *raw_data)
1234 {
1235 return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super);
1236 }
1237
1238 static void fuse_kill_sb_blk(struct super_block *sb)
1239 {
1240 struct fuse_conn *fc = get_fuse_conn_super(sb);
1241
1242 if (fc) {
1243 down_write(&fc->killsb);
1244 fc->sb = NULL;
1245 up_write(&fc->killsb);
1246 }
1247
1248 kill_block_super(sb);
1249 }
1250
1251 static struct file_system_type fuseblk_fs_type = {
1252 .owner = THIS_MODULE,
1253 .name = "fuseblk",
1254 .mount = fuse_mount_blk,
1255 .kill_sb = fuse_kill_sb_blk,
1256 .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE | FS_USERNS_MOUNT,
1257 };
1258 MODULE_ALIAS_FS("fuseblk");
1259
1260 static inline int register_fuseblk(void)
1261 {
1262 return register_filesystem(&fuseblk_fs_type);
1263 }
1264
1265 static inline void unregister_fuseblk(void)
1266 {
1267 unregister_filesystem(&fuseblk_fs_type);
1268 }
1269 #else
1270 static inline int register_fuseblk(void)
1271 {
1272 return 0;
1273 }
1274
1275 static inline void unregister_fuseblk(void)
1276 {
1277 }
1278 #endif
1279
1280 static void fuse_inode_init_once(void *foo)
1281 {
1282 struct inode *inode = foo;
1283
1284 inode_init_once(inode);
1285 }
1286
1287 static int __init fuse_fs_init(void)
1288 {
1289 int err;
1290
1291 fuse_inode_cachep = kmem_cache_create("fuse_inode",
1292 sizeof(struct fuse_inode), 0,
1293 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT|SLAB_RECLAIM_ACCOUNT,
1294 fuse_inode_init_once);
1295 err = -ENOMEM;
1296 if (!fuse_inode_cachep)
1297 goto out;
1298
1299 err = register_fuseblk();
1300 if (err)
1301 goto out2;
1302
1303 err = register_filesystem(&fuse_fs_type);
1304 if (err)
1305 goto out3;
1306
1307 return 0;
1308
1309 out3:
1310 unregister_fuseblk();
1311 out2:
1312 kmem_cache_destroy(fuse_inode_cachep);
1313 out:
1314 return err;
1315 }
1316
1317 static void fuse_fs_cleanup(void)
1318 {
1319 unregister_filesystem(&fuse_fs_type);
1320 unregister_fuseblk();
1321
1322 /*
1323 * Make sure all delayed rcu free inodes are flushed before we
1324 * destroy cache.
1325 */
1326 rcu_barrier();
1327 kmem_cache_destroy(fuse_inode_cachep);
1328 }
1329
1330 static struct kobject *fuse_kobj;
1331
1332 static int fuse_sysfs_init(void)
1333 {
1334 int err;
1335
1336 fuse_kobj = kobject_create_and_add("fuse", fs_kobj);
1337 if (!fuse_kobj) {
1338 err = -ENOMEM;
1339 goto out_err;
1340 }
1341
1342 err = sysfs_create_mount_point(fuse_kobj, "connections");
1343 if (err)
1344 goto out_fuse_unregister;
1345
1346 return 0;
1347
1348 out_fuse_unregister:
1349 kobject_put(fuse_kobj);
1350 out_err:
1351 return err;
1352 }
1353
1354 static void fuse_sysfs_cleanup(void)
1355 {
1356 sysfs_remove_mount_point(fuse_kobj, "connections");
1357 kobject_put(fuse_kobj);
1358 }
1359
1360 static int __init fuse_init(void)
1361 {
1362 int res;
1363
1364 printk(KERN_INFO "fuse init (API version %i.%i)\n",
1365 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
1366
1367 INIT_LIST_HEAD(&fuse_conn_list);
1368 res = fuse_fs_init();
1369 if (res)
1370 goto err;
1371
1372 res = fuse_dev_init();
1373 if (res)
1374 goto err_fs_cleanup;
1375
1376 res = fuse_sysfs_init();
1377 if (res)
1378 goto err_dev_cleanup;
1379
1380 res = fuse_ctl_init();
1381 if (res)
1382 goto err_sysfs_cleanup;
1383
1384 sanitize_global_limit(&max_user_bgreq);
1385 sanitize_global_limit(&max_user_congthresh);
1386
1387 return 0;
1388
1389 err_sysfs_cleanup:
1390 fuse_sysfs_cleanup();
1391 err_dev_cleanup:
1392 fuse_dev_cleanup();
1393 err_fs_cleanup:
1394 fuse_fs_cleanup();
1395 err:
1396 return res;
1397 }
1398
1399 static void __exit fuse_exit(void)
1400 {
1401 printk(KERN_DEBUG "fuse exit\n");
1402
1403 fuse_ctl_cleanup();
1404 fuse_sysfs_cleanup();
1405 fuse_fs_cleanup();
1406 fuse_dev_cleanup();
1407 }
1408
1409 module_init(fuse_init);
1410 module_exit(fuse_exit);
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