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 .get_sb = fuse_get_sb, 640 .kill_sb = kill_anon_super, 641 }; 642 643 #ifdef CONFIG_BLOCK 644 static int fuse_get_sb_blk(struct file_system_type *fs_type, 645 int flags, const char *dev_name, 646 void *raw_data, struct vfsmount *mnt) 647 { 648 return get_sb_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super, 649 mnt); 650 } 651 652 static struct file_system_type fuseblk_fs_type = { 653 .owner = THIS_MODULE, 654 .name = "fuseblk", 655 .get_sb = fuse_get_sb_blk, 656 .kill_sb = kill_block_super, 657 .fs_flags = FS_REQUIRES_DEV, 658 }; 659 660 static inline int register_fuseblk(void) 661 { 662 return register_filesystem(&fuseblk_fs_type); 663 } 664 665 static inline void unregister_fuseblk(void) 666 { 667 unregister_filesystem(&fuseblk_fs_type); 668 } 669 #else 670 static inline int register_fuseblk(void) 671 { 672 return 0; 673 } 674 675 static inline void unregister_fuseblk(void) 676 { 677 } 678 #endif 679 680 static decl_subsys(fuse, NULL, NULL); 681 static decl_subsys(connections, NULL, NULL); 682 683 static void fuse_inode_init_once(void *foo, struct kmem_cache *cachep, 684 unsigned long flags) 685 { 686 struct inode * inode = foo; 687 688 if (flags & SLAB_CTOR_CONSTRUCTOR) 689 inode_init_once(inode); 690 } 691 692 static int __init fuse_fs_init(void) 693 { 694 int err; 695 696 err = register_filesystem(&fuse_fs_type); 697 if (err) 698 goto out; 699 700 err = register_fuseblk(); 701 if (err) 702 goto out_unreg; 703 704 fuse_inode_cachep = kmem_cache_create("fuse_inode", 705 sizeof(struct fuse_inode), 706 0, SLAB_HWCACHE_ALIGN, 707 fuse_inode_init_once, NULL); 708 err = -ENOMEM; 709 if (!fuse_inode_cachep) 710 goto out_unreg2; 711 712 return 0; 713 714 out_unreg2: 715 unregister_fuseblk(); 716 out_unreg: 717 unregister_filesystem(&fuse_fs_type); 718 out: 719 return err; 720 } 721 722 static void fuse_fs_cleanup(void) 723 { 724 unregister_filesystem(&fuse_fs_type); 725 unregister_fuseblk(); 726 kmem_cache_destroy(fuse_inode_cachep); 727 } 728 729 static int fuse_sysfs_init(void) 730 { 731 int err; 732 733 kobj_set_kset_s(&fuse_subsys, fs_subsys); 734 err = subsystem_register(&fuse_subsys); 735 if (err) 736 goto out_err; 737 738 kobj_set_kset_s(&connections_subsys, fuse_subsys); 739 err = subsystem_register(&connections_subsys); 740 if (err) 741 goto out_fuse_unregister; 742 743 return 0; 744 745 out_fuse_unregister: 746 subsystem_unregister(&fuse_subsys); 747 out_err: 748 return err; 749 } 750 751 static void fuse_sysfs_cleanup(void) 752 { 753 subsystem_unregister(&connections_subsys); 754 subsystem_unregister(&fuse_subsys); 755 } 756 757 static int __init fuse_init(void) 758 { 759 int res; 760 761 printk("fuse init (API version %i.%i)\n", 762 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); 763 764 INIT_LIST_HEAD(&fuse_conn_list); 765 res = fuse_fs_init(); 766 if (res) 767 goto err; 768 769 res = fuse_dev_init(); 770 if (res) 771 goto err_fs_cleanup; 772 773 res = fuse_sysfs_init(); 774 if (res) 775 goto err_dev_cleanup; 776 777 res = fuse_ctl_init(); 778 if (res) 779 goto err_sysfs_cleanup; 780 781 return 0; 782 783 err_sysfs_cleanup: 784 fuse_sysfs_cleanup(); 785 err_dev_cleanup: 786 fuse_dev_cleanup(); 787 err_fs_cleanup: 788 fuse_fs_cleanup(); 789 err: 790 return res; 791 } 792 793 static void __exit fuse_exit(void) 794 { 795 printk(KERN_DEBUG "fuse exit\n"); 796 797 fuse_ctl_cleanup(); 798 fuse_sysfs_cleanup(); 799 fuse_fs_cleanup(); 800 fuse_dev_cleanup(); 801 } 802 803 module_init(fuse_init); 804 module_exit(fuse_exit); 805