Pull sgi-drivers-makefile-cleanup into release branch
[linux-2.6] / fs / fuse / inode.c
1 /*
2   FUSE: Filesystem in Userspace
3   Copyright (C) 2001-2005  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 spinlock_t fuse_lock;
26 static kmem_cache_t *fuse_inode_cachep;
27 static struct subsystem connections_subsys;
28
29 struct fuse_conn_attr {
30         struct attribute attr;
31         ssize_t (*show)(struct fuse_conn *, char *);
32         ssize_t (*store)(struct fuse_conn *, const char *, size_t);
33 };
34
35 #define FUSE_SUPER_MAGIC 0x65735546
36
37 struct fuse_mount_data {
38         int fd;
39         unsigned rootmode;
40         unsigned user_id;
41         unsigned group_id;
42         unsigned fd_present : 1;
43         unsigned rootmode_present : 1;
44         unsigned user_id_present : 1;
45         unsigned group_id_present : 1;
46         unsigned flags;
47         unsigned max_read;
48 };
49
50 static struct inode *fuse_alloc_inode(struct super_block *sb)
51 {
52         struct inode *inode;
53         struct fuse_inode *fi;
54
55         inode = kmem_cache_alloc(fuse_inode_cachep, SLAB_KERNEL);
56         if (!inode)
57                 return NULL;
58
59         fi = get_fuse_inode(inode);
60         fi->i_time = jiffies - 1;
61         fi->nodeid = 0;
62         fi->nlookup = 0;
63         fi->forget_req = fuse_request_alloc();
64         if (!fi->forget_req) {
65                 kmem_cache_free(fuse_inode_cachep, inode);
66                 return NULL;
67         }
68
69         return inode;
70 }
71
72 static void fuse_destroy_inode(struct inode *inode)
73 {
74         struct fuse_inode *fi = get_fuse_inode(inode);
75         if (fi->forget_req)
76                 fuse_request_free(fi->forget_req);
77         kmem_cache_free(fuse_inode_cachep, inode);
78 }
79
80 static void fuse_read_inode(struct inode *inode)
81 {
82         /* No op */
83 }
84
85 void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
86                       unsigned long nodeid, u64 nlookup)
87 {
88         struct fuse_forget_in *inarg = &req->misc.forget_in;
89         inarg->nlookup = nlookup;
90         req->in.h.opcode = FUSE_FORGET;
91         req->in.h.nodeid = nodeid;
92         req->in.numargs = 1;
93         req->in.args[0].size = sizeof(struct fuse_forget_in);
94         req->in.args[0].value = inarg;
95         request_send_noreply(fc, req);
96 }
97
98 static void fuse_clear_inode(struct inode *inode)
99 {
100         if (inode->i_sb->s_flags & MS_ACTIVE) {
101                 struct fuse_conn *fc = get_fuse_conn(inode);
102                 struct fuse_inode *fi = get_fuse_inode(inode);
103                 fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup);
104                 fi->forget_req = NULL;
105         }
106 }
107
108 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
109 {
110         if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size)
111                 invalidate_inode_pages(inode->i_mapping);
112
113         inode->i_ino     = attr->ino;
114         inode->i_mode    = (inode->i_mode & S_IFMT) + (attr->mode & 07777);
115         inode->i_nlink   = attr->nlink;
116         inode->i_uid     = attr->uid;
117         inode->i_gid     = attr->gid;
118         i_size_write(inode, attr->size);
119         inode->i_blksize = PAGE_CACHE_SIZE;
120         inode->i_blocks  = attr->blocks;
121         inode->i_atime.tv_sec   = attr->atime;
122         inode->i_atime.tv_nsec  = attr->atimensec;
123         inode->i_mtime.tv_sec   = attr->mtime;
124         inode->i_mtime.tv_nsec  = attr->mtimensec;
125         inode->i_ctime.tv_sec   = attr->ctime;
126         inode->i_ctime.tv_nsec  = attr->ctimensec;
127 }
128
129 static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
130 {
131         inode->i_mode = attr->mode & S_IFMT;
132         i_size_write(inode, attr->size);
133         if (S_ISREG(inode->i_mode)) {
134                 fuse_init_common(inode);
135                 fuse_init_file_inode(inode);
136         } else if (S_ISDIR(inode->i_mode))
137                 fuse_init_dir(inode);
138         else if (S_ISLNK(inode->i_mode))
139                 fuse_init_symlink(inode);
140         else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
141                  S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
142                 fuse_init_common(inode);
143                 init_special_inode(inode, inode->i_mode,
144                                    new_decode_dev(attr->rdev));
145         } else
146                 BUG();
147 }
148
149 static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
150 {
151         unsigned long nodeid = *(unsigned long *) _nodeidp;
152         if (get_node_id(inode) == nodeid)
153                 return 1;
154         else
155                 return 0;
156 }
157
158 static int fuse_inode_set(struct inode *inode, void *_nodeidp)
159 {
160         unsigned long nodeid = *(unsigned long *) _nodeidp;
161         get_fuse_inode(inode)->nodeid = nodeid;
162         return 0;
163 }
164
165 struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
166                         int generation, struct fuse_attr *attr)
167 {
168         struct inode *inode;
169         struct fuse_inode *fi;
170         struct fuse_conn *fc = get_fuse_conn_super(sb);
171         int retried = 0;
172
173  retry:
174         inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
175         if (!inode)
176                 return NULL;
177
178         if ((inode->i_state & I_NEW)) {
179                 inode->i_flags |= S_NOATIME|S_NOCMTIME;
180                 inode->i_generation = generation;
181                 inode->i_data.backing_dev_info = &fc->bdi;
182                 fuse_init_inode(inode, attr);
183                 unlock_new_inode(inode);
184         } else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
185                 BUG_ON(retried);
186                 /* Inode has changed type, any I/O on the old should fail */
187                 make_bad_inode(inode);
188                 iput(inode);
189                 retried = 1;
190                 goto retry;
191         }
192
193         fi = get_fuse_inode(inode);
194         fi->nlookup ++;
195         fuse_change_attributes(inode, attr);
196         return inode;
197 }
198
199 static void fuse_umount_begin(struct super_block *sb)
200 {
201         fuse_abort_conn(get_fuse_conn_super(sb));
202 }
203
204 static void fuse_put_super(struct super_block *sb)
205 {
206         struct fuse_conn *fc = get_fuse_conn_super(sb);
207
208         down_write(&fc->sbput_sem);
209         while (!list_empty(&fc->background))
210                 fuse_release_background(list_entry(fc->background.next,
211                                                    struct fuse_req, bg_entry));
212
213         spin_lock(&fuse_lock);
214         fc->mounted = 0;
215         fc->connected = 0;
216         spin_unlock(&fuse_lock);
217         up_write(&fc->sbput_sem);
218         /* Flush all readers on this fs */
219         wake_up_all(&fc->waitq);
220         kobject_del(&fc->kobj);
221         kobject_put(&fc->kobj);
222 }
223
224 static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
225 {
226         stbuf->f_type    = FUSE_SUPER_MAGIC;
227         stbuf->f_bsize   = attr->bsize;
228         stbuf->f_frsize  = attr->frsize;
229         stbuf->f_blocks  = attr->blocks;
230         stbuf->f_bfree   = attr->bfree;
231         stbuf->f_bavail  = attr->bavail;
232         stbuf->f_files   = attr->files;
233         stbuf->f_ffree   = attr->ffree;
234         stbuf->f_namelen = attr->namelen;
235         /* fsid is left zero */
236 }
237
238 static int fuse_statfs(struct super_block *sb, struct kstatfs *buf)
239 {
240         struct fuse_conn *fc = get_fuse_conn_super(sb);
241         struct fuse_req *req;
242         struct fuse_statfs_out outarg;
243         int err;
244
245         req = fuse_get_request(fc);
246         if (!req)
247                 return -EINTR;
248
249         memset(&outarg, 0, sizeof(outarg));
250         req->in.numargs = 0;
251         req->in.h.opcode = FUSE_STATFS;
252         req->out.numargs = 1;
253         req->out.args[0].size =
254                 fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
255         req->out.args[0].value = &outarg;
256         request_send(fc, req);
257         err = req->out.h.error;
258         if (!err)
259                 convert_fuse_statfs(buf, &outarg.st);
260         fuse_put_request(fc, req);
261         return err;
262 }
263
264 enum {
265         OPT_FD,
266         OPT_ROOTMODE,
267         OPT_USER_ID,
268         OPT_GROUP_ID,
269         OPT_DEFAULT_PERMISSIONS,
270         OPT_ALLOW_OTHER,
271         OPT_MAX_READ,
272         OPT_ERR
273 };
274
275 static match_table_t tokens = {
276         {OPT_FD,                        "fd=%u"},
277         {OPT_ROOTMODE,                  "rootmode=%o"},
278         {OPT_USER_ID,                   "user_id=%u"},
279         {OPT_GROUP_ID,                  "group_id=%u"},
280         {OPT_DEFAULT_PERMISSIONS,       "default_permissions"},
281         {OPT_ALLOW_OTHER,               "allow_other"},
282         {OPT_MAX_READ,                  "max_read=%u"},
283         {OPT_ERR,                       NULL}
284 };
285
286 static int parse_fuse_opt(char *opt, struct fuse_mount_data *d)
287 {
288         char *p;
289         memset(d, 0, sizeof(struct fuse_mount_data));
290         d->max_read = ~0;
291
292         while ((p = strsep(&opt, ",")) != NULL) {
293                 int token;
294                 int value;
295                 substring_t args[MAX_OPT_ARGS];
296                 if (!*p)
297                         continue;
298
299                 token = match_token(p, tokens, args);
300                 switch (token) {
301                 case OPT_FD:
302                         if (match_int(&args[0], &value))
303                                 return 0;
304                         d->fd = value;
305                         d->fd_present = 1;
306                         break;
307
308                 case OPT_ROOTMODE:
309                         if (match_octal(&args[0], &value))
310                                 return 0;
311                         d->rootmode = value;
312                         d->rootmode_present = 1;
313                         break;
314
315                 case OPT_USER_ID:
316                         if (match_int(&args[0], &value))
317                                 return 0;
318                         d->user_id = value;
319                         d->user_id_present = 1;
320                         break;
321
322                 case OPT_GROUP_ID:
323                         if (match_int(&args[0], &value))
324                                 return 0;
325                         d->group_id = value;
326                         d->group_id_present = 1;
327                         break;
328
329                 case OPT_DEFAULT_PERMISSIONS:
330                         d->flags |= FUSE_DEFAULT_PERMISSIONS;
331                         break;
332
333                 case OPT_ALLOW_OTHER:
334                         d->flags |= FUSE_ALLOW_OTHER;
335                         break;
336
337                 case OPT_MAX_READ:
338                         if (match_int(&args[0], &value))
339                                 return 0;
340                         d->max_read = value;
341                         break;
342
343                 default:
344                         return 0;
345                 }
346         }
347
348         if (!d->fd_present || !d->rootmode_present ||
349             !d->user_id_present || !d->group_id_present)
350                 return 0;
351
352         return 1;
353 }
354
355 static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
356 {
357         struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb);
358
359         seq_printf(m, ",user_id=%u", fc->user_id);
360         seq_printf(m, ",group_id=%u", fc->group_id);
361         if (fc->flags & FUSE_DEFAULT_PERMISSIONS)
362                 seq_puts(m, ",default_permissions");
363         if (fc->flags & FUSE_ALLOW_OTHER)
364                 seq_puts(m, ",allow_other");
365         if (fc->max_read != ~0)
366                 seq_printf(m, ",max_read=%u", fc->max_read);
367         return 0;
368 }
369
370 static void fuse_conn_release(struct kobject *kobj)
371 {
372         struct fuse_conn *fc = get_fuse_conn_kobj(kobj);
373
374         while (!list_empty(&fc->unused_list)) {
375                 struct fuse_req *req;
376                 req = list_entry(fc->unused_list.next, struct fuse_req, list);
377                 list_del(&req->list);
378                 fuse_request_free(req);
379         }
380         kfree(fc);
381 }
382
383 static struct fuse_conn *new_conn(void)
384 {
385         struct fuse_conn *fc;
386
387         fc = kzalloc(sizeof(*fc), GFP_KERNEL);
388         if (fc) {
389                 int i;
390                 init_waitqueue_head(&fc->waitq);
391                 INIT_LIST_HEAD(&fc->pending);
392                 INIT_LIST_HEAD(&fc->processing);
393                 INIT_LIST_HEAD(&fc->io);
394                 INIT_LIST_HEAD(&fc->unused_list);
395                 INIT_LIST_HEAD(&fc->background);
396                 sema_init(&fc->outstanding_sem, 1); /* One for INIT */
397                 init_rwsem(&fc->sbput_sem);
398                 kobj_set_kset_s(fc, connections_subsys);
399                 kobject_init(&fc->kobj);
400                 atomic_set(&fc->num_waiting, 0);
401                 for (i = 0; i < FUSE_MAX_OUTSTANDING; i++) {
402                         struct fuse_req *req = fuse_request_alloc();
403                         if (!req) {
404                                 kobject_put(&fc->kobj);
405                                 return NULL;
406                         }
407                         list_add(&req->list, &fc->unused_list);
408                 }
409                 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
410                 fc->bdi.unplug_io_fn = default_unplug_io_fn;
411                 fc->reqctr = 0;
412         }
413         return fc;
414 }
415
416 static struct fuse_conn *get_conn(struct file *file, struct super_block *sb)
417 {
418         struct fuse_conn *fc;
419         int err;
420
421         err = -EINVAL;
422         if (file->f_op != &fuse_dev_operations)
423                 goto out_err;
424
425         err = -ENOMEM;
426         fc = new_conn();
427         if (!fc)
428                 goto out_err;
429
430         spin_lock(&fuse_lock);
431         err = -EINVAL;
432         if (file->private_data)
433                 goto out_unlock;
434
435         kobject_get(&fc->kobj);
436         file->private_data = fc;
437         spin_unlock(&fuse_lock);
438         return fc;
439
440  out_unlock:
441         spin_unlock(&fuse_lock);
442         kobject_put(&fc->kobj);
443  out_err:
444         return ERR_PTR(err);
445 }
446
447 static struct inode *get_root_inode(struct super_block *sb, unsigned mode)
448 {
449         struct fuse_attr attr;
450         memset(&attr, 0, sizeof(attr));
451
452         attr.mode = mode;
453         attr.ino = FUSE_ROOT_ID;
454         return fuse_iget(sb, 1, 0, &attr);
455 }
456
457 static struct super_operations fuse_super_operations = {
458         .alloc_inode    = fuse_alloc_inode,
459         .destroy_inode  = fuse_destroy_inode,
460         .read_inode     = fuse_read_inode,
461         .clear_inode    = fuse_clear_inode,
462         .put_super      = fuse_put_super,
463         .umount_begin   = fuse_umount_begin,
464         .statfs         = fuse_statfs,
465         .show_options   = fuse_show_options,
466 };
467
468 static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
469 {
470         int i;
471         struct fuse_init_out *arg = &req->misc.init_out;
472
473         if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
474                 fc->conn_error = 1;
475         else {
476                 unsigned long ra_pages;
477
478                 if (arg->minor >= 6) {
479                         ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
480                         if (arg->flags & FUSE_ASYNC_READ)
481                                 fc->async_read = 1;
482                 } else
483                         ra_pages = fc->max_read / PAGE_CACHE_SIZE;
484
485                 fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
486                 fc->minor = arg->minor;
487                 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
488         }
489
490         /* After INIT reply is received other requests can go
491            out.  So do (FUSE_MAX_OUTSTANDING - 1) number of
492            up()s on outstanding_sem.  The last up() is done in
493            fuse_putback_request() */
494         for (i = 1; i < FUSE_MAX_OUTSTANDING; i++)
495                 up(&fc->outstanding_sem);
496
497         fuse_put_request(fc, req);
498 }
499
500 static void fuse_send_init(struct fuse_conn *fc)
501 {
502         /* This is called from fuse_read_super() so there's guaranteed
503            to be exactly one request available */
504         struct fuse_req *req = fuse_get_request(fc);
505         struct fuse_init_in *arg = &req->misc.init_in;
506
507         arg->major = FUSE_KERNEL_VERSION;
508         arg->minor = FUSE_KERNEL_MINOR_VERSION;
509         arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
510         arg->flags |= FUSE_ASYNC_READ;
511         req->in.h.opcode = FUSE_INIT;
512         req->in.numargs = 1;
513         req->in.args[0].size = sizeof(*arg);
514         req->in.args[0].value = arg;
515         req->out.numargs = 1;
516         /* Variable length arguement used for backward compatibility
517            with interface version < 7.5.  Rest of init_out is zeroed
518            by do_get_request(), so a short reply is not a problem */
519         req->out.argvar = 1;
520         req->out.args[0].size = sizeof(struct fuse_init_out);
521         req->out.args[0].value = &req->misc.init_out;
522         req->end = process_init_reply;
523         request_send_background(fc, req);
524 }
525
526 static unsigned long long conn_id(void)
527 {
528         static unsigned long long ctr = 1;
529         unsigned long long val;
530         spin_lock(&fuse_lock);
531         val = ctr++;
532         spin_unlock(&fuse_lock);
533         return val;
534 }
535
536 static int fuse_fill_super(struct super_block *sb, void *data, int silent)
537 {
538         struct fuse_conn *fc;
539         struct inode *root;
540         struct fuse_mount_data d;
541         struct file *file;
542         struct dentry *root_dentry;
543         int err;
544
545         if (!parse_fuse_opt((char *) data, &d))
546                 return -EINVAL;
547
548         sb->s_blocksize = PAGE_CACHE_SIZE;
549         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
550         sb->s_magic = FUSE_SUPER_MAGIC;
551         sb->s_op = &fuse_super_operations;
552         sb->s_maxbytes = MAX_LFS_FILESIZE;
553
554         file = fget(d.fd);
555         if (!file)
556                 return -EINVAL;
557
558         fc = get_conn(file, sb);
559         fput(file);
560         if (IS_ERR(fc))
561                 return PTR_ERR(fc);
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         err = kobject_set_name(&fc->kobj, "%llu", conn_id());
583         if (err)
584                 goto err_put_root;
585
586         err = kobject_add(&fc->kobj);
587         if (err)
588                 goto err_put_root;
589
590         sb->s_root = root_dentry;
591         spin_lock(&fuse_lock);
592         fc->mounted = 1;
593         fc->connected = 1;
594         spin_unlock(&fuse_lock);
595
596         fuse_send_init(fc);
597
598         return 0;
599
600  err_put_root:
601         dput(root_dentry);
602  err:
603         kobject_put(&fc->kobj);
604         return err;
605 }
606
607 static struct super_block *fuse_get_sb(struct file_system_type *fs_type,
608                                        int flags, const char *dev_name,
609                                        void *raw_data)
610 {
611         return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super);
612 }
613
614 static struct file_system_type fuse_fs_type = {
615         .owner          = THIS_MODULE,
616         .name           = "fuse",
617         .get_sb         = fuse_get_sb,
618         .kill_sb        = kill_anon_super,
619 };
620
621 static ssize_t fuse_conn_waiting_show(struct fuse_conn *fc, char *page)
622 {
623         return sprintf(page, "%i\n", atomic_read(&fc->num_waiting));
624 }
625
626 static ssize_t fuse_conn_abort_store(struct fuse_conn *fc, const char *page,
627                                      size_t count)
628 {
629         fuse_abort_conn(fc);
630         return count;
631 }
632
633 static struct fuse_conn_attr fuse_conn_waiting =
634         __ATTR(waiting, 0400, fuse_conn_waiting_show, NULL);
635 static struct fuse_conn_attr fuse_conn_abort =
636         __ATTR(abort, 0600, NULL, fuse_conn_abort_store);
637
638 static struct attribute *fuse_conn_attrs[] = {
639         &fuse_conn_waiting.attr,
640         &fuse_conn_abort.attr,
641         NULL,
642 };
643
644 static ssize_t fuse_conn_attr_show(struct kobject *kobj,
645                                    struct attribute *attr,
646                                    char *page)
647 {
648         struct fuse_conn_attr *fca =
649                 container_of(attr, struct fuse_conn_attr, attr);
650
651         if (fca->show)
652                 return fca->show(get_fuse_conn_kobj(kobj), page);
653         else
654                 return -EACCES;
655 }
656
657 static ssize_t fuse_conn_attr_store(struct kobject *kobj,
658                                     struct attribute *attr,
659                                     const char *page, size_t count)
660 {
661         struct fuse_conn_attr *fca =
662                 container_of(attr, struct fuse_conn_attr, attr);
663
664         if (fca->store)
665                 return fca->store(get_fuse_conn_kobj(kobj), page, count);
666         else
667                 return -EACCES;
668 }
669
670 static struct sysfs_ops fuse_conn_sysfs_ops = {
671         .show   = &fuse_conn_attr_show,
672         .store  = &fuse_conn_attr_store,
673 };
674
675 static struct kobj_type ktype_fuse_conn = {
676         .release        = fuse_conn_release,
677         .sysfs_ops      = &fuse_conn_sysfs_ops,
678         .default_attrs  = fuse_conn_attrs,
679 };
680
681 static decl_subsys(fuse, NULL, NULL);
682 static decl_subsys(connections, &ktype_fuse_conn, NULL);
683
684 static void fuse_inode_init_once(void *foo, kmem_cache_t *cachep,
685                                  unsigned long flags)
686 {
687         struct inode * inode = foo;
688
689         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
690             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                 printk("fuse: failed to register filesystem\n");
701         else {
702                 fuse_inode_cachep = kmem_cache_create("fuse_inode",
703                                                       sizeof(struct fuse_inode),
704                                                       0, SLAB_HWCACHE_ALIGN,
705                                                       fuse_inode_init_once, NULL);
706                 if (!fuse_inode_cachep) {
707                         unregister_filesystem(&fuse_fs_type);
708                         err = -ENOMEM;
709                 }
710         }
711
712         return err;
713 }
714
715 static void fuse_fs_cleanup(void)
716 {
717         unregister_filesystem(&fuse_fs_type);
718         kmem_cache_destroy(fuse_inode_cachep);
719 }
720
721 static int fuse_sysfs_init(void)
722 {
723         int err;
724
725         kset_set_kset_s(&fuse_subsys, fs_subsys);
726         err = subsystem_register(&fuse_subsys);
727         if (err)
728                 goto out_err;
729
730         kset_set_kset_s(&connections_subsys, fuse_subsys);
731         err = subsystem_register(&connections_subsys);
732         if (err)
733                 goto out_fuse_unregister;
734
735         return 0;
736
737  out_fuse_unregister:
738         subsystem_unregister(&fuse_subsys);
739  out_err:
740         return err;
741 }
742
743 static void fuse_sysfs_cleanup(void)
744 {
745         subsystem_unregister(&connections_subsys);
746         subsystem_unregister(&fuse_subsys);
747 }
748
749 static int __init fuse_init(void)
750 {
751         int res;
752
753         printk("fuse init (API version %i.%i)\n",
754                FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
755
756         spin_lock_init(&fuse_lock);
757         res = fuse_fs_init();
758         if (res)
759                 goto err;
760
761         res = fuse_dev_init();
762         if (res)
763                 goto err_fs_cleanup;
764
765         res = fuse_sysfs_init();
766         if (res)
767                 goto err_dev_cleanup;
768
769         return 0;
770
771  err_dev_cleanup:
772         fuse_dev_cleanup();
773  err_fs_cleanup:
774         fuse_fs_cleanup();
775  err:
776         return res;
777 }
778
779 static void __exit fuse_exit(void)
780 {
781         printk(KERN_DEBUG "fuse exit\n");
782
783         fuse_sysfs_cleanup();
784         fuse_fs_cleanup();
785         fuse_dev_cleanup();
786 }
787
788 module_init(fuse_init);
789 module_exit(fuse_exit);