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); 754