Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6] / fs / fuse / inode.c
1 /*
2   FUSE: Filesystem in Userspace
3   Copyright (C) 2001-2006  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/mount.h>
15 #include <linux/seq_file.h>
16 #include <linux/init.h>
17 #include <linux/module.h>
18 #include <linux/parser.h>
19 #include <linux/statfs.h>
20
21 MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
22 MODULE_DESCRIPTION("Filesystem in Userspace");
23 MODULE_LICENSE("GPL");
24
25 static kmem_cache_t *fuse_inode_cachep;
26 static struct subsystem connections_subsys;
27
28 struct fuse_conn_attr {
29         struct attribute attr;
30         ssize_t (*show)(struct fuse_conn *, char *);
31         ssize_t (*store)(struct fuse_conn *, const char *, size_t);
32 };
33
34 #define FUSE_SUPER_MAGIC 0x65735546
35
36 struct fuse_mount_data {
37         int fd;
38         unsigned rootmode;
39         unsigned user_id;
40         unsigned group_id;
41         unsigned fd_present : 1;
42         unsigned rootmode_present : 1;
43         unsigned user_id_present : 1;
44         unsigned group_id_present : 1;
45         unsigned flags;
46         unsigned max_read;
47 };
48
49 static struct inode *fuse_alloc_inode(struct super_block *sb)
50 {
51         struct inode *inode;
52         struct fuse_inode *fi;
53
54         inode = kmem_cache_alloc(fuse_inode_cachep, SLAB_KERNEL);
55         if (!inode)
56                 return NULL;
57
58         fi = get_fuse_inode(inode);
59         fi->i_time = jiffies - 1;
60         fi->nodeid = 0;
61         fi->nlookup = 0;
62         fi->forget_req = fuse_request_alloc();
63         if (!fi->forget_req) {
64                 kmem_cache_free(fuse_inode_cachep, inode);
65                 return NULL;
66         }
67
68         return inode;
69 }
70
71 static void fuse_destroy_inode(struct inode *inode)
72 {
73         struct fuse_inode *fi = get_fuse_inode(inode);
74         if (fi->forget_req)
75                 fuse_request_free(fi->forget_req);
76         kmem_cache_free(fuse_inode_cachep, inode);
77 }
78
79 static void fuse_read_inode(struct inode *inode)
80 {
81         /* No op */
82 }
83
84 void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
85                       unsigned long nodeid, u64 nlookup)
86 {
87         struct fuse_forget_in *inarg = &req->misc.forget_in;
88         inarg->nlookup = nlookup;
89         req->in.h.opcode = FUSE_FORGET;
90         req->in.h.nodeid = nodeid;
91         req->in.numargs = 1;
92         req->in.args[0].size = sizeof(struct fuse_forget_in);
93         req->in.args[0].value = inarg;
94         request_send_noreply(fc, req);
95 }
96
97 static void fuse_clear_inode(struct inode *inode)
98 {
99         if (inode->i_sb->s_flags & MS_ACTIVE) {
100                 struct fuse_conn *fc = get_fuse_conn(inode);
101                 struct fuse_inode *fi = get_fuse_inode(inode);
102                 fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup);
103                 fi->forget_req = NULL;
104         }
105 }
106
107 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
108 {
109         if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size)
110                 invalidate_inode_pages(inode->i_mapping);
111
112         inode->i_ino     = attr->ino;
113         inode->i_mode    = (inode->i_mode & S_IFMT) + (attr->mode & 07777);
114         inode->i_nlink   = attr->nlink;
115         inode->i_uid     = attr->uid;
116         inode->i_gid     = attr->gid;
117         i_size_write(inode, attr->size);
118         inode->i_blksize = PAGE_CACHE_SIZE;
119         inode->i_blocks  = attr->blocks;
120         inode->i_atime.tv_sec   = attr->atime;
121         inode->i_atime.tv_nsec  = attr->atimensec;
122         inode->i_mtime.tv_sec   = attr->mtime;
123         inode->i_mtime.tv_nsec  = attr->mtimensec;
124         inode->i_ctime.tv_sec   = attr->ctime;
125         inode->i_ctime.tv_nsec  = attr->ctimensec;
126 }
127
128 static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
129 {
130         inode->i_mode = attr->mode & S_IFMT;
131         i_size_write(inode, attr->size);
132         if (S_ISREG(inode->i_mode)) {
133                 fuse_init_common(inode);
134                 fuse_init_file_inode(inode);
135         } else if (S_ISDIR(inode->i_mode))
136                 fuse_init_dir(inode);
137         else if (S_ISLNK(inode->i_mode))
138                 fuse_init_symlink(inode);
139         else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
140                  S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
141                 fuse_init_common(inode);
142                 init_special_inode(inode, inode->i_mode,
143                                    new_decode_dev(attr->rdev));
144         } else
145                 BUG();
146 }
147
148 static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
149 {
150         unsigned long nodeid = *(unsigned long *) _nodeidp;
151         if (get_node_id(inode) == nodeid)
152                 return 1;
153         else
154                 return 0;
155 }
156
157 static int fuse_inode_set(struct inode *inode, void *_nodeidp)
158 {
159         unsigned long nodeid = *(unsigned long *) _nodeidp;
160         get_fuse_inode(inode)->nodeid = nodeid;
161         return 0;
162 }
163
164 struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
165                         int generation, struct fuse_attr *attr)
166 {
167         struct inode *inode;
168         struct fuse_inode *fi;
169         struct fuse_conn *fc = get_fuse_conn_super(sb);
170         int retried = 0;
171
172  retry:
173         inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
174         if (!inode)
175                 return NULL;
176
177         if ((inode->i_state & I_NEW)) {
178                 inode->i_flags |= S_NOATIME|S_NOCMTIME;
179                 inode->i_generation = generation;
180                 inode->i_data.backing_dev_info = &fc->bdi;
181                 fuse_init_inode(inode, attr);
182                 unlock_new_inode(inode);
183         } else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
184                 BUG_ON(retried);
185                 /* Inode has changed type, any I/O on the old should fail */
186                 make_bad_inode(inode);
187                 iput(inode);
188                 retried = 1;
189                 goto retry;
190         }
191
192         fi = get_fuse_inode(inode);
193         fi->nlookup ++;
194         fuse_change_attributes(inode, attr);
195         return inode;
196 }
197
198 static void fuse_umount_begin(struct super_block *sb)
199 {
200         fuse_abort_conn(get_fuse_conn_super(sb));
201 }
202
203 static void fuse_put_super(struct super_block *sb)
204 {
205         struct fuse_conn *fc = get_fuse_conn_super(sb);
206
207         down_write(&fc->sbput_sem);
208         while (!list_empty(&fc->background))
209                 fuse_release_background(fc,
210                                         list_entry(fc->background.next,
211                                                    struct fuse_req, bg_entry));
212
213         spin_lock(&fc->lock);
214         fc->mounted = 0;
215         fc->connected = 0;
216         spin_unlock(&fc->lock);
217         up_write(&fc->sbput_sem);
218         /* Flush all readers on this fs */
219         kill_fasync(&fc->fasync, SIGIO, POLL_IN);
220         wake_up_all(&fc->waitq);
221         kobject_del(&fc->kobj);
222         kobject_put(&fc->kobj);
223 }
224
225 static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
226 {
227         stbuf->f_type    = FUSE_SUPER_MAGIC;
228         stbuf->f_bsize   = attr->bsize;
229         stbuf->f_frsize  = attr->frsize;
230         stbuf->f_blocks  = attr->blocks;
231         stbuf->f_bfree   = attr->bfree;
232         stbuf->f_bavail  = attr->bavail;
233         stbuf->f_files   = attr->files;
234         stbuf->f_ffree   = attr->ffree;
235         stbuf->f_namelen = attr->namelen;
236         /* fsid is left zero */
237 }
238
239 static int fuse_statfs(struct super_block *sb, struct kstatfs *buf)
240 {
241         struct fuse_conn *fc = get_fuse_conn_super(sb);
242         struct fuse_req *req;
243         struct fuse_statfs_out outarg;
244         int err;
245
246         req = fuse_get_req(fc);
247         if (IS_ERR(req))
248                 return PTR_ERR(req);
249
250         memset(&outarg, 0, sizeof(outarg));
251         req->in.numargs = 0;
252         req->in.h.opcode = FUSE_STATFS;
253         req->out.numargs = 1;
254         req->out.args[0].size =
255                 fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
256         req->out.args[0].value = &outarg;
257         request_send(fc, req);
258         err = req->out.h.error;
259         if (!err)
260                 convert_fuse_statfs(buf, &outarg.st);
261         fuse_put_request(fc, req);
262         return err;
263 }
264
265 enum {
266         OPT_FD,
267         OPT_ROOTMODE,
268         OPT_USER_ID,
269         OPT_GROUP_ID,
270         OPT_DEFAULT_PERMISSIONS,
271         OPT_ALLOW_OTHER,
272         OPT_MAX_READ,
273         OPT_ERR
274 };
275
276 static match_table_t tokens = {
277         {OPT_FD,                        "fd=%u"},
278         {OPT_ROOTMODE,                  "rootmode=%o"},
279         {OPT_USER_ID,                   "user_id=%u"},
280         {OPT_GROUP_ID,                  "group_id=%u"},
281         {OPT_DEFAULT_PERMISSIONS,       "default_permissions"},
282         {OPT_ALLOW_OTHER,               "allow_other"},
283         {OPT_MAX_READ,                  "max_read=%u"},
284         {OPT_ERR,                       NULL}
285 };
286
287 static int parse_fuse_opt(char *opt, struct fuse_mount_data *d)
288 {
289         char *p;
290         memset(d, 0, sizeof(struct fuse_mount_data));
291         d->max_read = ~0;
292
293         while ((p = strsep(&opt, ",")) != NULL) {
294                 int token;
295                 int value;
296                 substring_t args[MAX_OPT_ARGS];
297                 if (!*p)
298                         continue;
299
300                 token = match_token(p, tokens, args);
301                 switch (token) {
302                 case OPT_FD:
303                         if (match_int(&args[0], &value))
304                                 return 0;
305                         d->fd = value;
306                         d->fd_present = 1;
307                         break;
308
309                 case OPT_ROOTMODE:
310                         if (match_octal(&args[0], &value))
311                                 return 0;
312                         d->rootmode = value;
313                         d->rootmode_present = 1;
314                         break;
315
316                 case OPT_USER_ID:
317                         if (match_int(&args[0], &value))
318                                 return 0;
319                         d->user_id = value;
320                         d->user_id_present = 1;
321                         break;
322
323                 case OPT_GROUP_ID:
324                         if (match_int(&args[0], &value))
325                                 return 0;
326                         d->group_id = value;
327                         d->group_id_present = 1;
328                         break;
329
330                 case OPT_DEFAULT_PERMISSIONS:
331                         d->flags |= FUSE_DEFAULT_PERMISSIONS;
332                         break;
333
334                 case OPT_ALLOW_OTHER:
335                         d->flags |= FUSE_ALLOW_OTHER;
336                         break;
337
338                 case OPT_MAX_READ:
339                         if (match_int(&args[0], &value))
340                                 return 0;
341                         d->max_read = value;
342                         break;
343
344                 default:
345                         return 0;
346                 }
347         }
348
349         if (!d->fd_present || !d->rootmode_present ||
350             !d->user_id_present || !d->group_id_present)
351                 return 0;
352
353         return 1;
354 }
355
356 static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
357 {
358         struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb);
359
360         seq_printf(m, ",user_id=%u", fc->user_id);
361         seq_printf(m, ",group_id=%u", fc->group_id);
362         if (fc->flags & FUSE_DEFAULT_PERMISSIONS)
363                 seq_puts(m, ",default_permissions");
364         if (fc->flags & FUSE_ALLOW_OTHER)
365                 seq_puts(m, ",allow_other");
366         if (fc->max_read != ~0)
367                 seq_printf(m, ",max_read=%u", fc->max_read);
368         return 0;
369 }
370
371 static void fuse_conn_release(struct kobject *kobj)
372 {
373         kfree(get_fuse_conn_kobj(kobj));
374 }
375
376 static struct fuse_conn *new_conn(void)
377 {
378         struct fuse_conn *fc;
379
380         fc = kzalloc(sizeof(*fc), GFP_KERNEL);
381         if (fc) {
382                 spin_lock_init(&fc->lock);
383                 init_waitqueue_head(&fc->waitq);
384                 init_waitqueue_head(&fc->blocked_waitq);
385                 INIT_LIST_HEAD(&fc->pending);
386                 INIT_LIST_HEAD(&fc->processing);
387                 INIT_LIST_HEAD(&fc->io);
388                 INIT_LIST_HEAD(&fc->background);
389                 init_rwsem(&fc->sbput_sem);
390                 kobj_set_kset_s(fc, connections_subsys);
391                 kobject_init(&fc->kobj);
392                 atomic_set(&fc->num_waiting, 0);
393                 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
394                 fc->bdi.unplug_io_fn = default_unplug_io_fn;
395                 fc->reqctr = 0;
396                 fc->blocked = 1;
397         }
398         return fc;
399 }
400
401 static struct inode *get_root_inode(struct super_block *sb, unsigned mode)
402 {
403         struct fuse_attr attr;
404         memset(&attr, 0, sizeof(attr));
405
406         attr.mode = mode;
407         attr.ino = FUSE_ROOT_ID;
408         return fuse_iget(sb, 1, 0, &attr);
409 }
410
411 static struct super_operations fuse_super_operations = {
412         .alloc_inode    = fuse_alloc_inode,
413         .destroy_inode  = fuse_destroy_inode,
414         .read_inode     = fuse_read_inode,
415         .clear_inode    = fuse_clear_inode,
416         .put_super      = fuse_put_super,
417         .umount_begin   = fuse_umount_begin,
418         .statfs         = fuse_statfs,
419         .show_options   = fuse_show_options,
420 };
421
422 static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
423 {
424         struct fuse_init_out *arg = &req->misc.init_out;
425
426         if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
427                 fc->conn_error = 1;
428         else {
429                 unsigned long ra_pages;
430
431                 if (arg->minor >= 6) {
432                         ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
433                         if (arg->flags & FUSE_ASYNC_READ)
434                                 fc->async_read = 1;
435                 } else
436                         ra_pages = fc->max_read / PAGE_CACHE_SIZE;
437
438                 fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
439                 fc->minor = arg->minor;
440                 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
441         }
442         fuse_put_request(fc, req);
443         fc->blocked = 0;
444         wake_up_all(&fc->blocked_waitq);
445 }
446
447 static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
448 {
449         struct fuse_init_in *arg = &req->misc.init_in;
450
451         arg->major = FUSE_KERNEL_VERSION;
452         arg->minor = FUSE_KERNEL_MINOR_VERSION;
453         arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
454         arg->flags |= FUSE_ASYNC_READ;
455         req->in.h.opcode = FUSE_INIT;
456         req->in.numargs = 1;
457         req->in.args[0].size = sizeof(*arg);
458         req->in.args[0].value = arg;
459         req->out.numargs = 1;
460         /* Variable length arguement used for backward compatibility
461            with interface version < 7.5.  Rest of init_out is zeroed
462            by do_get_request(), so a short reply is not a problem */
463         req->out.argvar = 1;
464         req->out.args[0].size = sizeof(struct fuse_init_out);
465         req->out.args[0].value = &req->misc.init_out;
466         req->end = process_init_reply;
467         request_send_background(fc, req);
468 }
469
470 static unsigned long long conn_id(void)
471 {
472         /* BKL is held for ->get_sb() */
473         static unsigned long long ctr = 1;
474         return ctr++;
475 }
476
477 static int fuse_fill_super(struct super_block *sb, void *data, int silent)
478 {
479         struct fuse_conn *fc;
480         struct inode *root;
481         struct fuse_mount_data d;
482         struct file *file;
483         struct dentry *root_dentry;
484         struct fuse_req *init_req;
485         int err;
486
487         if (!parse_fuse_opt((char *) data, &d))
488                 return -EINVAL;
489
490         sb->s_blocksize = PAGE_CACHE_SIZE;
491         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
492         sb->s_magic = FUSE_SUPER_MAGIC;
493         sb->s_op = &fuse_super_operations;
494         sb->s_maxbytes = MAX_LFS_FILESIZE;
495
496         file = fget(d.fd);
497         if (!file)
498                 return -EINVAL;
499
500         if (file->f_op != &fuse_dev_operations)
501                 return -EINVAL;
502
503         fc = new_conn();
504         if (!fc)
505                 return -ENOMEM;
506
507         fc->flags = d.flags;
508         fc->user_id = d.user_id;
509         fc->group_id = d.group_id;
510         fc->max_read = d.max_read;
511
512         /* Used by get_root_inode() */
513         sb->s_fs_info = fc;
514
515         err = -ENOMEM;
516         root = get_root_inode(sb, d.rootmode);
517         if (!root)
518                 goto err;
519
520         root_dentry = d_alloc_root(root);
521         if (!root_dentry) {
522                 iput(root);
523                 goto err;
524         }
525
526         init_req = fuse_request_alloc();
527         if (!init_req)
528                 goto err_put_root;
529
530         err = kobject_set_name(&fc->kobj, "%llu", conn_id());
531         if (err)
532                 goto err_free_req;
533
534         err = kobject_add(&fc->kobj);
535         if (err)
536                 goto err_free_req;
537
538         /* Setting file->private_data can't race with other mount()
539            instances, since BKL is held for ->get_sb() */
540         err = -EINVAL;
541         if (file->private_data)
542                 goto err_kobject_del;
543
544         sb->s_root = root_dentry;
545         fc->mounted = 1;
546         fc->connected = 1;
547         kobject_get(&fc->kobj);
548         file->private_data = fc;
549         /*
550          * atomic_dec_and_test() in fput() provides the necessary
551          * memory barrier for file->private_data to be visible on all
552          * CPUs after this
553          */
554         fput(file);
555
556         fuse_send_init(fc, init_req);
557
558         return 0;
559
560  err_kobject_del:
561         kobject_del(&fc->kobj);
562  err_free_req:
563         fuse_request_free(init_req);
564  err_put_root:
565         dput(root_dentry);
566  err:
567         fput(file);
568         kobject_put(&fc->kobj);
569         return err;
570 }
571
572 static struct super_block *fuse_get_sb(struct file_system_type *fs_type,
573                                        int flags, const char *dev_name,
574                                        void *raw_data)
575 {
576         return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super);
577 }
578
579 static struct file_system_type fuse_fs_type = {
580         .owner          = THIS_MODULE,
581         .name           = "fuse",
582         .get_sb         = fuse_get_sb,
583         .kill_sb        = kill_anon_super,
584 };
585
586 static ssize_t fuse_conn_waiting_show(struct fuse_conn *fc, char *page)
587 {
588         return sprintf(page, "%i\n", atomic_read(&fc->num_waiting));
589 }
590
591 static ssize_t fuse_conn_abort_store(struct fuse_conn *fc, const char *page,
592                                      size_t count)
593 {
594         fuse_abort_conn(fc);
595         return count;
596 }
597
598 static struct fuse_conn_attr fuse_conn_waiting =
599         __ATTR(waiting, 0400, fuse_conn_waiting_show, NULL);
600 static struct fuse_conn_attr fuse_conn_abort =
601         __ATTR(abort, 0600, NULL, fuse_conn_abort_store);
602
603 static struct attribute *fuse_conn_attrs[] = {
604         &fuse_conn_waiting.attr,
605         &fuse_conn_abort.attr,
606         NULL,
607 };
608
609 static ssize_t fuse_conn_attr_show(struct kobject *kobj,
610                                    struct attribute *attr,
611                                    char *page)
612 {
613         struct fuse_conn_attr *fca =
614                 container_of(attr, struct fuse_conn_attr, attr);
615
616         if (fca->show)
617                 return fca->show(get_fuse_conn_kobj(kobj), page);
618         else
619                 return -EACCES;
620 }
621
622 static ssize_t fuse_conn_attr_store(struct kobject *kobj,
623                                     struct attribute *attr,
624                                     const char *page, size_t count)
625 {
626         struct fuse_conn_attr *fca =
627                 container_of(attr, struct fuse_conn_attr, attr);
628
629         if (fca->store)
630                 return fca->store(get_fuse_conn_kobj(kobj), page, count);
631         else
632                 return -EACCES;
633 }
634
635 static struct sysfs_ops fuse_conn_sysfs_ops = {
636         .show   = &fuse_conn_attr_show,
637         .store  = &fuse_conn_attr_store,
638 };
639
640 static struct kobj_type ktype_fuse_conn = {
641         .release        = fuse_conn_release,
642         .sysfs_ops      = &fuse_conn_sysfs_ops,
643         .default_attrs  = fuse_conn_attrs,
644 };
645
646 static decl_subsys(fuse, NULL, NULL);
647 static decl_subsys(connections, &ktype_fuse_conn, NULL);
648
649 static void fuse_inode_init_once(void *foo, kmem_cache_t *cachep,
650                                  unsigned long flags)
651 {
652         struct inode * inode = foo;
653
654         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
655             SLAB_CTOR_CONSTRUCTOR)
656                 inode_init_once(inode);
657 }
658
659 static int __init fuse_fs_init(void)
660 {
661         int err;
662
663         err = register_filesystem(&fuse_fs_type);
664         if (err)
665                 printk("fuse: failed to register filesystem\n");
666         else {
667                 fuse_inode_cachep = kmem_cache_create("fuse_inode",
668                                                       sizeof(struct fuse_inode),
669                                                       0, SLAB_HWCACHE_ALIGN,
670                                                       fuse_inode_init_once, NULL);
671                 if (!fuse_inode_cachep) {
672                         unregister_filesystem(&fuse_fs_type);
673                         err = -ENOMEM;
674                 }
675         }
676
677         return err;
678 }
679
680 static void fuse_fs_cleanup(void)
681 {
682         unregister_filesystem(&fuse_fs_type);
683         kmem_cache_destroy(fuse_inode_cachep);
684 }
685
686 static int fuse_sysfs_init(void)
687 {
688         int err;
689
690         kset_set_kset_s(&fuse_subsys, fs_subsys);
691         err = subsystem_register(&fuse_subsys);
692         if (err)
693                 goto out_err;
694
695         kset_set_kset_s(&connections_subsys, fuse_subsys);
696         err = subsystem_register(&connections_subsys);
697         if (err)
698                 goto out_fuse_unregister;
699
700         return 0;
701
702  out_fuse_unregister:
703         subsystem_unregister(&fuse_subsys);
704  out_err:
705         return err;
706 }
707
708 static void fuse_sysfs_cleanup(void)
709 {
710         subsystem_unregister(&connections_subsys);
711         subsystem_unregister(&fuse_subsys);
712 }
713
714 static int __init fuse_init(void)
715 {
716         int res;
717
718         printk("fuse init (API version %i.%i)\n",
719                FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
720
721         res = fuse_fs_init();
722         if (res)
723                 goto err;
724
725         res = fuse_dev_init();
726         if (res)
727                 goto err_fs_cleanup;
728
729         res = fuse_sysfs_init();
730         if (res)
731                 goto err_dev_cleanup;
732
733         return 0;
734
735  err_dev_cleanup:
736         fuse_dev_cleanup();
737  err_fs_cleanup:
738         fuse_fs_cleanup();
739  err:
740         return res;
741 }
742
743 static void __exit fuse_exit(void)
744 {
745         printk(KERN_DEBUG "fuse exit\n");
746
747         fuse_sysfs_cleanup();
748         fuse_fs_cleanup();
749         fuse_dev_cleanup();
750 }
751
752 module_init(fuse_init);
753 module_exit(fuse_exit);