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