Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc
[sfrench/cifs-2.6.git] / 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/seq_file.h>
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/parser.h>
18 #include <linux/statfs.h>
19 #include <linux/random.h>
20
21 MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
22 MODULE_DESCRIPTION("Filesystem in Userspace");
23 MODULE_LICENSE("GPL");
24
25 static struct kmem_cache *fuse_inode_cachep;
26 struct list_head fuse_conn_list;
27 DEFINE_MUTEX(fuse_mutex);
28
29 #define FUSE_SUPER_MAGIC 0x65735546
30
31 struct fuse_mount_data {
32         int fd;
33         unsigned rootmode;
34         unsigned user_id;
35         unsigned group_id;
36         unsigned fd_present : 1;
37         unsigned rootmode_present : 1;
38         unsigned user_id_present : 1;
39         unsigned group_id_present : 1;
40         unsigned flags;
41         unsigned max_read;
42         unsigned blksize;
43 };
44
45 static struct inode *fuse_alloc_inode(struct super_block *sb)
46 {
47         struct inode *inode;
48         struct fuse_inode *fi;
49
50         inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL);
51         if (!inode)
52                 return NULL;
53
54         fi = get_fuse_inode(inode);
55         fi->i_time = 0;
56         fi->nodeid = 0;
57         fi->nlookup = 0;
58         fi->forget_req = fuse_request_alloc();
59         if (!fi->forget_req) {
60                 kmem_cache_free(fuse_inode_cachep, inode);
61                 return NULL;
62         }
63
64         return inode;
65 }
66
67 static void fuse_destroy_inode(struct inode *inode)
68 {
69         struct fuse_inode *fi = get_fuse_inode(inode);
70         if (fi->forget_req)
71                 fuse_request_free(fi->forget_req);
72         kmem_cache_free(fuse_inode_cachep, inode);
73 }
74
75 static void fuse_read_inode(struct inode *inode)
76 {
77         /* No op */
78 }
79
80 void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
81                       unsigned long nodeid, u64 nlookup)
82 {
83         struct fuse_forget_in *inarg = &req->misc.forget_in;
84         inarg->nlookup = nlookup;
85         req->in.h.opcode = FUSE_FORGET;
86         req->in.h.nodeid = nodeid;
87         req->in.numargs = 1;
88         req->in.args[0].size = sizeof(struct fuse_forget_in);
89         req->in.args[0].value = inarg;
90         request_send_noreply(fc, req);
91 }
92
93 static void fuse_clear_inode(struct inode *inode)
94 {
95         if (inode->i_sb->s_flags & MS_ACTIVE) {
96                 struct fuse_conn *fc = get_fuse_conn(inode);
97                 struct fuse_inode *fi = get_fuse_inode(inode);
98                 fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup);
99                 fi->forget_req = NULL;
100         }
101 }
102
103 static int fuse_remount_fs(struct super_block *sb, int *flags, char *data)
104 {
105         if (*flags & MS_MANDLOCK)
106                 return -EINVAL;
107
108         return 0;
109 }
110
111 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
112 {
113         struct fuse_conn *fc = get_fuse_conn(inode);
114         if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size)
115                 invalidate_mapping_pages(inode->i_mapping, 0, -1);
116
117         inode->i_ino     = attr->ino;
118         inode->i_mode    = (inode->i_mode & S_IFMT) + (attr->mode & 07777);
119         inode->i_nlink   = attr->nlink;
120         inode->i_uid     = attr->uid;
121         inode->i_gid     = attr->gid;
122         spin_lock(&fc->lock);
123         i_size_write(inode, attr->size);
124         spin_unlock(&fc->lock);
125         inode->i_blocks  = attr->blocks;
126         inode->i_atime.tv_sec   = attr->atime;
127         inode->i_atime.tv_nsec  = attr->atimensec;
128         inode->i_mtime.tv_sec   = attr->mtime;
129         inode->i_mtime.tv_nsec  = attr->mtimensec;
130         inode->i_ctime.tv_sec   = attr->ctime;
131         inode->i_ctime.tv_nsec  = attr->ctimensec;
132 }
133
134 static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
135 {
136         inode->i_mode = attr->mode & S_IFMT;
137         inode->i_size = attr->size;
138         if (S_ISREG(inode->i_mode)) {
139                 fuse_init_common(inode);
140                 fuse_init_file_inode(inode);
141         } else if (S_ISDIR(inode->i_mode))
142                 fuse_init_dir(inode);
143         else if (S_ISLNK(inode->i_mode))
144                 fuse_init_symlink(inode);
145         else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
146                  S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
147                 fuse_init_common(inode);
148                 init_special_inode(inode, inode->i_mode,
149                                    new_decode_dev(attr->rdev));
150         } else
151                 BUG();
152 }
153
154 static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
155 {
156         unsigned long nodeid = *(unsigned long *) _nodeidp;
157         if (get_node_id(inode) == nodeid)
158                 return 1;
159         else
160                 return 0;
161 }
162
163 static int fuse_inode_set(struct inode *inode, void *_nodeidp)
164 {
165         unsigned long nodeid = *(unsigned long *) _nodeidp;
166         get_fuse_inode(inode)->nodeid = nodeid;
167         return 0;
168 }
169
170 struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
171                         int generation, struct fuse_attr *attr)
172 {
173         struct inode *inode;
174         struct fuse_inode *fi;
175         struct fuse_conn *fc = get_fuse_conn_super(sb);
176
177  retry:
178         inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
179         if (!inode)
180                 return NULL;
181
182         if ((inode->i_state & I_NEW)) {
183                 inode->i_flags |= S_NOATIME|S_NOCMTIME;
184                 inode->i_generation = generation;
185                 inode->i_data.backing_dev_info = &fc->bdi;
186                 fuse_init_inode(inode, attr);
187                 unlock_new_inode(inode);
188         } else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
189                 /* Inode has changed type, any I/O on the old should fail */
190                 make_bad_inode(inode);
191                 iput(inode);
192                 goto retry;
193         }
194
195         fi = get_fuse_inode(inode);
196         spin_lock(&fc->lock);
197         fi->nlookup ++;
198         spin_unlock(&fc->lock);
199         fuse_change_attributes(inode, attr);
200         return inode;
201 }
202
203 static void fuse_umount_begin(struct vfsmount *vfsmnt, int flags)
204 {
205         if (flags & MNT_FORCE)
206                 fuse_abort_conn(get_fuse_conn_super(vfsmnt->mnt_sb));
207 }
208
209 static void fuse_send_destroy(struct fuse_conn *fc)
210 {
211         struct fuse_req *req = fc->destroy_req;
212         if (req && fc->conn_init) {
213                 fc->destroy_req = NULL;
214                 req->in.h.opcode = FUSE_DESTROY;
215                 req->force = 1;
216                 request_send(fc, req);
217                 fuse_put_request(fc, req);
218         }
219 }
220
221 static void fuse_put_super(struct super_block *sb)
222 {
223         struct fuse_conn *fc = get_fuse_conn_super(sb);
224
225         fuse_send_destroy(fc);
226         spin_lock(&fc->lock);
227         fc->connected = 0;
228         fc->blocked = 0;
229         spin_unlock(&fc->lock);
230         /* Flush all readers on this fs */
231         kill_fasync(&fc->fasync, SIGIO, POLL_IN);
232         wake_up_all(&fc->waitq);
233         wake_up_all(&fc->blocked_waitq);
234         mutex_lock(&fuse_mutex);
235         list_del(&fc->entry);
236         fuse_ctl_remove_conn(fc);
237         mutex_unlock(&fuse_mutex);
238         fuse_conn_put(fc);
239 }
240
241 static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
242 {
243         stbuf->f_type    = FUSE_SUPER_MAGIC;
244         stbuf->f_bsize   = attr->bsize;
245         stbuf->f_frsize  = attr->frsize;
246         stbuf->f_blocks  = attr->blocks;
247         stbuf->f_bfree   = attr->bfree;
248         stbuf->f_bavail  = attr->bavail;
249         stbuf->f_files   = attr->files;
250         stbuf->f_ffree   = attr->ffree;
251         stbuf->f_namelen = attr->namelen;
252         /* fsid is left zero */
253 }
254
255 static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
256 {
257         struct super_block *sb = dentry->d_sb;
258         struct fuse_conn *fc = get_fuse_conn_super(sb);
259         struct fuse_req *req;
260         struct fuse_statfs_out outarg;
261         int err;
262
263         req = fuse_get_req(fc);
264         if (IS_ERR(req))
265                 return PTR_ERR(req);
266
267         memset(&outarg, 0, sizeof(outarg));
268         req->in.numargs = 0;
269         req->in.h.opcode = FUSE_STATFS;
270         req->in.h.nodeid = get_node_id(dentry->d_inode);
271         req->out.numargs = 1;
272         req->out.args[0].size =
273                 fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
274         req->out.args[0].value = &outarg;
275         request_send(fc, req);
276         err = req->out.h.error;
277         if (!err)
278                 convert_fuse_statfs(buf, &outarg.st);
279         fuse_put_request(fc, req);
280         return err;
281 }
282
283 enum {
284         OPT_FD,
285         OPT_ROOTMODE,
286         OPT_USER_ID,
287         OPT_GROUP_ID,
288         OPT_DEFAULT_PERMISSIONS,
289         OPT_ALLOW_OTHER,
290         OPT_MAX_READ,
291         OPT_BLKSIZE,
292         OPT_ERR
293 };
294
295 static match_table_t tokens = {
296         {OPT_FD,                        "fd=%u"},
297         {OPT_ROOTMODE,                  "rootmode=%o"},
298         {OPT_USER_ID,                   "user_id=%u"},
299         {OPT_GROUP_ID,                  "group_id=%u"},
300         {OPT_DEFAULT_PERMISSIONS,       "default_permissions"},
301         {OPT_ALLOW_OTHER,               "allow_other"},
302         {OPT_MAX_READ,                  "max_read=%u"},
303         {OPT_BLKSIZE,                   "blksize=%u"},
304         {OPT_ERR,                       NULL}
305 };
306
307 static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev)
308 {
309         char *p;
310         memset(d, 0, sizeof(struct fuse_mount_data));
311         d->max_read = ~0;
312         d->blksize = 512;
313
314         while ((p = strsep(&opt, ",")) != NULL) {
315                 int token;
316                 int value;
317                 substring_t args[MAX_OPT_ARGS];
318                 if (!*p)
319                         continue;
320
321                 token = match_token(p, tokens, args);
322                 switch (token) {
323                 case OPT_FD:
324                         if (match_int(&args[0], &value))
325                                 return 0;
326                         d->fd = value;
327                         d->fd_present = 1;
328                         break;
329
330                 case OPT_ROOTMODE:
331                         if (match_octal(&args[0], &value))
332                                 return 0;
333                         if (!fuse_valid_type(value))
334                                 return 0;
335                         d->rootmode = value;
336                         d->rootmode_present = 1;
337                         break;
338
339                 case OPT_USER_ID:
340                         if (match_int(&args[0], &value))
341                                 return 0;
342                         d->user_id = value;
343                         d->user_id_present = 1;
344                         break;
345
346                 case OPT_GROUP_ID:
347                         if (match_int(&args[0], &value))
348                                 return 0;
349                         d->group_id = value;
350                         d->group_id_present = 1;
351                         break;
352
353                 case OPT_DEFAULT_PERMISSIONS:
354                         d->flags |= FUSE_DEFAULT_PERMISSIONS;
355                         break;
356
357                 case OPT_ALLOW_OTHER:
358                         d->flags |= FUSE_ALLOW_OTHER;
359                         break;
360
361                 case OPT_MAX_READ:
362                         if (match_int(&args[0], &value))
363                                 return 0;
364                         d->max_read = value;
365                         break;
366
367                 case OPT_BLKSIZE:
368                         if (!is_bdev || match_int(&args[0], &value))
369                                 return 0;
370                         d->blksize = value;
371                         break;
372
373                 default:
374                         return 0;
375                 }
376         }
377
378         if (!d->fd_present || !d->rootmode_present ||
379             !d->user_id_present || !d->group_id_present)
380                 return 0;
381
382         return 1;
383 }
384
385 static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
386 {
387         struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb);
388
389         seq_printf(m, ",user_id=%u", fc->user_id);
390         seq_printf(m, ",group_id=%u", fc->group_id);
391         if (fc->flags & FUSE_DEFAULT_PERMISSIONS)
392                 seq_puts(m, ",default_permissions");
393         if (fc->flags & FUSE_ALLOW_OTHER)
394                 seq_puts(m, ",allow_other");
395         if (fc->max_read != ~0)
396                 seq_printf(m, ",max_read=%u", fc->max_read);
397         return 0;
398 }
399
400 static struct fuse_conn *new_conn(void)
401 {
402         struct fuse_conn *fc;
403
404         fc = kzalloc(sizeof(*fc), GFP_KERNEL);
405         if (fc) {
406                 spin_lock_init(&fc->lock);
407                 mutex_init(&fc->inst_mutex);
408                 atomic_set(&fc->count, 1);
409                 init_waitqueue_head(&fc->waitq);
410                 init_waitqueue_head(&fc->blocked_waitq);
411                 INIT_LIST_HEAD(&fc->pending);
412                 INIT_LIST_HEAD(&fc->processing);
413                 INIT_LIST_HEAD(&fc->io);
414                 INIT_LIST_HEAD(&fc->interrupts);
415                 atomic_set(&fc->num_waiting, 0);
416                 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
417                 fc->bdi.unplug_io_fn = default_unplug_io_fn;
418                 fc->reqctr = 0;
419                 fc->blocked = 1;
420                 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
421         }
422         return fc;
423 }
424
425 void fuse_conn_put(struct fuse_conn *fc)
426 {
427         if (atomic_dec_and_test(&fc->count)) {
428                 if (fc->destroy_req)
429                         fuse_request_free(fc->destroy_req);
430                 mutex_destroy(&fc->inst_mutex);
431                 kfree(fc);
432         }
433 }
434
435 struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)
436 {
437         atomic_inc(&fc->count);
438         return fc;
439 }
440
441 static struct inode *get_root_inode(struct super_block *sb, unsigned mode)
442 {
443         struct fuse_attr attr;
444         memset(&attr, 0, sizeof(attr));
445
446         attr.mode = mode;
447         attr.ino = FUSE_ROOT_ID;
448         return fuse_iget(sb, 1, 0, &attr);
449 }
450
451 static const struct super_operations fuse_super_operations = {
452         .alloc_inode    = fuse_alloc_inode,
453         .destroy_inode  = fuse_destroy_inode,
454         .read_inode     = fuse_read_inode,
455         .clear_inode    = fuse_clear_inode,
456         .remount_fs     = fuse_remount_fs,
457         .put_super      = fuse_put_super,
458         .umount_begin   = fuse_umount_begin,
459         .statfs         = fuse_statfs,
460         .show_options   = fuse_show_options,
461 };
462
463 static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
464 {
465         struct fuse_init_out *arg = &req->misc.init_out;
466
467         if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
468                 fc->conn_error = 1;
469         else {
470                 unsigned long ra_pages;
471
472                 if (arg->minor >= 6) {
473                         ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
474                         if (arg->flags & FUSE_ASYNC_READ)
475                                 fc->async_read = 1;
476                         if (!(arg->flags & FUSE_POSIX_LOCKS))
477                                 fc->no_lock = 1;
478                 } else {
479                         ra_pages = fc->max_read / PAGE_CACHE_SIZE;
480                         fc->no_lock = 1;
481                 }
482
483                 fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
484                 fc->minor = arg->minor;
485                 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
486                 fc->conn_init = 1;
487         }
488         fuse_put_request(fc, req);
489         fc->blocked = 0;
490         wake_up_all(&fc->blocked_waitq);
491 }
492
493 static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
494 {
495         struct fuse_init_in *arg = &req->misc.init_in;
496
497         arg->major = FUSE_KERNEL_VERSION;
498         arg->minor = FUSE_KERNEL_MINOR_VERSION;
499         arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
500         arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS;
501         req->in.h.opcode = FUSE_INIT;
502         req->in.numargs = 1;
503         req->in.args[0].size = sizeof(*arg);
504         req->in.args[0].value = arg;
505         req->out.numargs = 1;
506         /* Variable length arguement used for backward compatibility
507            with interface version < 7.5.  Rest of init_out is zeroed
508            by do_get_request(), so a short reply is not a problem */
509         req->out.argvar = 1;
510         req->out.args[0].size = sizeof(struct fuse_init_out);
511         req->out.args[0].value = &req->misc.init_out;
512         req->end = process_init_reply;
513         request_send_background(fc, req);
514 }
515
516 static u64 conn_id(void)
517 {
518         static u64 ctr = 1;
519         return ctr++;
520 }
521
522 static int fuse_fill_super(struct super_block *sb, void *data, int silent)
523 {
524         struct fuse_conn *fc;
525         struct inode *root;
526         struct fuse_mount_data d;
527         struct file *file;
528         struct dentry *root_dentry;
529         struct fuse_req *init_req;
530         int err;
531         int is_bdev = sb->s_bdev != NULL;
532
533         if (sb->s_flags & MS_MANDLOCK)
534                 return -EINVAL;
535
536         if (!parse_fuse_opt((char *) data, &d, is_bdev))
537                 return -EINVAL;
538
539         if (is_bdev) {
540 #ifdef CONFIG_BLOCK
541                 if (!sb_set_blocksize(sb, d.blksize))
542                         return -EINVAL;
543 #endif
544         } else {
545                 sb->s_blocksize = PAGE_CACHE_SIZE;
546                 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
547         }
548         sb->s_magic = FUSE_SUPER_MAGIC;
549         sb->s_op = &fuse_super_operations;
550         sb->s_maxbytes = MAX_LFS_FILESIZE;
551
552         file = fget(d.fd);
553         if (!file)
554                 return -EINVAL;
555
556         if (file->f_op != &fuse_dev_operations)
557                 return -EINVAL;
558
559         fc = new_conn();
560         if (!fc)
561                 return -ENOMEM;
562
563         fc->flags = d.flags;
564         fc->user_id = d.user_id;
565         fc->group_id = d.group_id;
566         fc->max_read = d.max_read;
567
568         /* Used by get_root_inode() */
569         sb->s_fs_info = fc;
570
571         err = -ENOMEM;
572         root = get_root_inode(sb, d.rootmode);
573         if (!root)
574                 goto err;
575
576         root_dentry = d_alloc_root(root);
577         if (!root_dentry) {
578                 iput(root);
579                 goto err;
580         }
581
582         init_req = fuse_request_alloc();
583         if (!init_req)
584                 goto err_put_root;
585
586         if (is_bdev) {
587                 fc->destroy_req = fuse_request_alloc();
588                 if (!fc->destroy_req)
589                         goto err_put_root;
590         }
591
592         mutex_lock(&fuse_mutex);
593         err = -EINVAL;
594         if (file->private_data)
595                 goto err_unlock;
596
597         fc->id = conn_id();
598         err = fuse_ctl_add_conn(fc);
599         if (err)
600                 goto err_unlock;
601
602         list_add_tail(&fc->entry, &fuse_conn_list);
603         sb->s_root = root_dentry;
604         fc->connected = 1;
605         file->private_data = fuse_conn_get(fc);
606         mutex_unlock(&fuse_mutex);
607         /*
608          * atomic_dec_and_test() in fput() provides the necessary
609          * memory barrier for file->private_data to be visible on all
610          * CPUs after this
611          */
612         fput(file);
613
614         fuse_send_init(fc, init_req);
615
616         return 0;
617
618  err_unlock:
619         mutex_unlock(&fuse_mutex);
620         fuse_request_free(init_req);
621  err_put_root:
622         dput(root_dentry);
623  err:
624         fput(file);
625         fuse_conn_put(fc);
626         return err;
627 }
628
629 static int fuse_get_sb(struct file_system_type *fs_type,
630                        int flags, const char *dev_name,
631                        void *raw_data, struct vfsmount *mnt)
632 {
633         return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt);
634 }
635
636 static struct file_system_type fuse_fs_type = {
637         .owner          = THIS_MODULE,
638         .name           = "fuse",
639         .fs_flags       = FS_HAS_SUBTYPE,
640         .get_sb         = fuse_get_sb,
641         .kill_sb        = kill_anon_super,
642 };
643
644 #ifdef CONFIG_BLOCK
645 static int fuse_get_sb_blk(struct file_system_type *fs_type,
646                            int flags, const char *dev_name,
647                            void *raw_data, struct vfsmount *mnt)
648 {
649         return get_sb_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super,
650                            mnt);
651 }
652
653 static struct file_system_type fuseblk_fs_type = {
654         .owner          = THIS_MODULE,
655         .name           = "fuseblk",
656         .fs_flags       = FS_HAS_SUBTYPE,
657         .get_sb         = fuse_get_sb_blk,
658         .kill_sb        = kill_block_super,
659         .fs_flags       = FS_REQUIRES_DEV,
660 };
661
662 static inline int register_fuseblk(void)
663 {
664         return register_filesystem(&fuseblk_fs_type);
665 }
666
667 static inline void unregister_fuseblk(void)
668 {
669         unregister_filesystem(&fuseblk_fs_type);
670 }
671 #else
672 static inline int register_fuseblk(void)
673 {
674         return 0;
675 }
676
677 static inline void unregister_fuseblk(void)
678 {
679 }
680 #endif
681
682 static decl_subsys(fuse, NULL, NULL);
683 static decl_subsys(connections, NULL, NULL);
684
685 static void fuse_inode_init_once(void *foo, struct kmem_cache *cachep,
686                                  unsigned long flags)
687 {
688         struct inode * inode = foo;
689
690         if (flags & SLAB_CTOR_CONSTRUCTOR)
691                 inode_init_once(inode);
692 }
693
694 static int __init fuse_fs_init(void)
695 {
696         int err;
697
698         err = register_filesystem(&fuse_fs_type);
699         if (err)
700                 goto out;
701
702         err = register_fuseblk();
703         if (err)
704                 goto out_unreg;
705
706         fuse_inode_cachep = kmem_cache_create("fuse_inode",
707                                               sizeof(struct fuse_inode),
708                                               0, SLAB_HWCACHE_ALIGN,
709                                               fuse_inode_init_once, NULL);
710         err = -ENOMEM;
711         if (!fuse_inode_cachep)
712                 goto out_unreg2;
713
714         return 0;
715
716  out_unreg2:
717         unregister_fuseblk();
718  out_unreg:
719         unregister_filesystem(&fuse_fs_type);
720  out:
721         return err;
722 }
723
724 static void fuse_fs_cleanup(void)
725 {
726         unregister_filesystem(&fuse_fs_type);
727         unregister_fuseblk();
728         kmem_cache_destroy(fuse_inode_cachep);
729 }
730
731 static int fuse_sysfs_init(void)
732 {
733         int err;
734
735         kobj_set_kset_s(&fuse_subsys, fs_subsys);
736         err = subsystem_register(&fuse_subsys);
737         if (err)
738                 goto out_err;
739
740         kobj_set_kset_s(&connections_subsys, fuse_subsys);
741         err = subsystem_register(&connections_subsys);
742         if (err)
743                 goto out_fuse_unregister;
744
745         return 0;
746
747  out_fuse_unregister:
748         subsystem_unregister(&fuse_subsys);
749  out_err:
750         return err;
751 }
752
753 static void fuse_sysfs_cleanup(void)
754 {
755         subsystem_unregister(&connections_subsys);
756         subsystem_unregister(&fuse_subsys);
757 }
758
759 static int __init fuse_init(void)
760 {
761         int res;
762
763         printk("fuse init (API version %i.%i)\n",
764                FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
765
766         INIT_LIST_HEAD(&fuse_conn_list);
767         res = fuse_fs_init();
768         if (res)
769                 goto err;
770
771         res = fuse_dev_init();
772         if (res)
773                 goto err_fs_cleanup;
774
775         res = fuse_sysfs_init();
776         if (res)
777                 goto err_dev_cleanup;
778
779         res = fuse_ctl_init();
780         if (res)
781                 goto err_sysfs_cleanup;
782
783         return 0;
784
785  err_sysfs_cleanup:
786         fuse_sysfs_cleanup();
787  err_dev_cleanup:
788         fuse_dev_cleanup();
789  err_fs_cleanup:
790         fuse_fs_cleanup();
791  err:
792         return res;
793 }
794
795 static void __exit fuse_exit(void)
796 {
797         printk(KERN_DEBUG "fuse exit\n");
798
799         fuse_ctl_cleanup();
800         fuse_sysfs_cleanup();
801         fuse_fs_cleanup();
802         fuse_dev_cleanup();
803 }
804
805 module_init(fuse_init);
806 module_exit(fuse_exit);