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 #include <linux/sched.h> 21 22 MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); 23 MODULE_DESCRIPTION("Filesystem in Userspace"); 24 MODULE_LICENSE("GPL"); 25 26 static struct kmem_cache *fuse_inode_cachep; 27 struct list_head fuse_conn_list; 28 DEFINE_MUTEX(fuse_mutex); 29 30 #define FUSE_SUPER_MAGIC 0x65735546 31 32 struct fuse_mount_data { 33 int fd; 34 unsigned rootmode; 35 unsigned user_id; 36 unsigned group_id; 37 unsigned fd_present : 1; 38 unsigned rootmode_present : 1; 39 unsigned user_id_present : 1; 40 unsigned group_id_present : 1; 41 unsigned flags; 42 unsigned max_read; 43 unsigned blksize; 44 }; 45 46 static struct inode *fuse_alloc_inode(struct super_block *sb) 47 { 48 struct inode *inode; 49 struct fuse_inode *fi; 50 51 inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL); 52 if (!inode) 53 return NULL; 54 55 fi = get_fuse_inode(inode); 56 fi->i_time = 0; 57 fi->nodeid = 0; 58 fi->nlookup = 0; 59 fi->forget_req = fuse_request_alloc(); 60 if (!fi->forget_req) { 61 kmem_cache_free(fuse_inode_cachep, inode); 62 return NULL; 63 } 64 65 return inode; 66 } 67 68 static void fuse_destroy_inode(struct inode *inode) 69 { 70 struct fuse_inode *fi = get_fuse_inode(inode); 71 if (fi->forget_req) 72 fuse_request_free(fi->forget_req); 73 kmem_cache_free(fuse_inode_cachep, inode); 74 } 75 76 static void fuse_read_inode(struct inode *inode) 77 { 78 /* No op */ 79 } 80 81 void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req, 82 unsigned long nodeid, u64 nlookup) 83 { 84 struct fuse_forget_in *inarg = &req->misc.forget_in; 85 inarg->nlookup = nlookup; 86 req->in.h.opcode = FUSE_FORGET; 87 req->in.h.nodeid = nodeid; 88 req->in.numargs = 1; 89 req->in.args[0].size = sizeof(struct fuse_forget_in); 90 req->in.args[0].value = inarg; 91 request_send_noreply(fc, req); 92 } 93 94 static void fuse_clear_inode(struct inode *inode) 95 { 96 if (inode->i_sb->s_flags & MS_ACTIVE) { 97 struct fuse_conn *fc = get_fuse_conn(inode); 98 struct fuse_inode *fi = get_fuse_inode(inode); 99 fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup); 100 fi->forget_req = NULL; 101 } 102 } 103 104 static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) 105 { 106 if (*flags & MS_MANDLOCK) 107 return -EINVAL; 108 109 return 0; 110 } 111 112 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr) 113 { 114 struct fuse_conn *fc = get_fuse_conn(inode); 115 if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size) 116 invalidate_mapping_pages(inode->i_mapping, 0, -1); 117 118 inode->i_ino = attr->ino; 119 inode->i_mode = (inode->i_mode & S_IFMT) + (attr->mode & 07777); 120 inode->i_nlink = attr->nlink; 121 inode->i_uid = attr->uid; 122 inode->i_gid = attr->gid; 123 spin_lock(&fc->lock); 124 i_size_write(inode, attr->size); 125 spin_unlock(&fc->lock); 126 inode->i_blocks = attr->blocks; 127 inode->i_atime.tv_sec = attr->atime; 128 inode->i_atime.tv_nsec = attr->atimensec; 129 inode->i_mtime.tv_sec = attr->mtime; 130 inode->i_mtime.tv_nsec = attr->mtimensec; 131 inode->i_ctime.tv_sec = attr->ctime; 132 inode->i_ctime.tv_nsec = attr->ctimensec; 133 } 134 135 static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) 136 { 137 inode->i_mode = attr->mode & S_IFMT; 138 inode->i_size = attr->size; 139 if (S_ISREG(inode->i_mode)) { 140 fuse_init_common(inode); 141 fuse_init_file_inode(inode); 142 } else if (S_ISDIR(inode->i_mode)) 143 fuse_init_dir(inode); 144 else if (S_ISLNK(inode->i_mode)) 145 fuse_init_symlink(inode); 146 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || 147 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { 148 fuse_init_common(inode); 149 init_special_inode(inode, inode->i_mode, 150 new_decode_dev(attr->rdev)); 151 } else 152 BUG(); 153 } 154 155 static int fuse_inode_eq(struct inode *inode, void *_nodeidp) 156 { 157 unsigned long nodeid = *(unsigned long *) _nodeidp; 158 if (get_node_id(inode) == nodeid) 159 return 1; 160 else 161 return 0; 162 } 163 164 static int fuse_inode_set(struct inode *inode, void *_nodeidp) 165 { 166 unsigned long nodeid = *(unsigned long *) _nodeidp; 167 get_fuse_inode(inode)->nodeid = nodeid; 168 return 0; 169 } 170 171 struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid, 172 int generation, struct fuse_attr *attr) 173 { 174 struct inode *inode; 175 struct fuse_inode *fi; 176 struct fuse_conn *fc = get_fuse_conn_super(sb); 177 178 retry: 179 inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); 180 if (!inode) 181 return NULL; 182 183 if ((inode->i_state & I_NEW)) { 184 inode->i_flags |= S_NOATIME|S_NOCMTIME; 185 inode->i_generation = generation; 186 inode->i_data.backing_dev_info = &fc->bdi; 187 fuse_init_inode(inode, attr); 188 unlock_new_inode(inode); 189 } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { 190 /* Inode has changed type, any I/O on the old should fail */ 191 make_bad_inode(inode); 192 iput(inode); 193 goto retry; 194 } 195 196 fi = get_fuse_inode(inode); 197 spin_lock(&fc->lock); 198 fi->nlookup ++; 199 spin_unlock(&fc->lock); 200 fuse_change_attributes(inode, attr); 201 return inode; 202 } 203 204 static void fuse_umount_begin(struct vfsmount *vfsmnt, int flags) 205 { 206 if (flags & MNT_FORCE) 207 fuse_abort_conn(get_fuse_conn_super(vfsmnt->mnt_sb)); 208 } 209 210 static void fuse_send_destroy(struct fuse_conn *fc) 211 { 212 struct fuse_req *req = fc->destroy_req; 213 if (req && fc->conn_init) { 214 fc->destroy_req = NULL; 215 req->in.h.opcode = FUSE_DESTROY; 216 req->force = 1; 217 request_send(fc, req); 218 fuse_put_request(fc, req); 219 } 220 } 221 222 static void fuse_put_super(struct super_block *sb) 223 { 224 struct fuse_conn *fc = get_fuse_conn_super(sb); 225 226 fuse_send_destroy(fc); 227 spin_lock(&fc->lock); 228 fc->connected = 0; 229 fc->blocked = 0; 230 spin_unlock(&fc->lock); 231 /* Flush all readers on this fs */ 232 kill_fasync(&fc->fasync, SIGIO, POLL_IN); 233 wake_up_all(&fc->waitq); 234 wake_up_all(&fc->blocked_waitq); 235 mutex_lock(&fuse_mutex); 236 list_del(&fc->entry); 237 fuse_ctl_remove_conn(fc); 238 mutex_unlock(&fuse_mutex); 239 fuse_conn_put(fc); 240 } 241 242 static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) 243 { 244 stbuf->f_type = FUSE_SUPER_MAGIC; 245 stbuf->f_bsize = attr->bsize; 246 stbuf->f_frsize = attr->frsize; 247 stbuf->f_blocks = attr->blocks; 248 stbuf->f_bfree = attr->bfree; 249 stbuf->f_bavail = attr->bavail; 250 stbuf->f_files = attr->files; 251 stbuf->f_ffree = attr->ffree; 252 stbuf->f_namelen = attr->namelen; 253 /* fsid is left zero */ 254 } 255 256 static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) 257 { 258 struct super_block *sb = dentry->d_sb; 259 struct fuse_conn *fc = get_fuse_conn_super(sb); 260 struct fuse_req *req; 261 struct fuse_statfs_out outarg; 262 int err; 263 264 req = fuse_get_req(fc); 265 if (IS_ERR(req)) 266 return PTR_ERR(req); 267 268 memset(&outarg, 0, sizeof(outarg)); 269 req->in.numargs = 0; 270 req->in.h.opcode = FUSE_STATFS; 271 req->in.h.nodeid = get_node_id(dentry->d_inode); 272 req->out.numargs = 1; 273 req->out.args[0].size = 274 fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg); 275 req->out.args[0].value = &outarg; 276 request_send(fc, req); 277 err = req->out.h.error; 278 if (!err) 279 convert_fuse_statfs(buf, &outarg.st); 280 fuse_put_request(fc, req); 281 return err; 282 } 283 284 enum { 285 OPT_FD, 286 OPT_ROOTMODE, 287 OPT_USER_ID, 288 OPT_GROUP_ID, 289 OPT_DEFAULT_PERMISSIONS, 290 OPT_ALLOW_OTHER, 291 OPT_MAX_READ, 292 OPT_BLKSIZE, 293 OPT_ERR 294 }; 295 296 static match_table_t tokens = { 297 {OPT_FD, "fd=%u"}, 298 {OPT_ROOTMODE, "rootmode=%o"}, 299 {OPT_USER_ID, "user_id=%u"}, 300 {OPT_GROUP_ID, "group_id=%u"}, 301 {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, 302 {OPT_ALLOW_OTHER, "allow_other"}, 303 {OPT_MAX_READ, "max_read=%u"}, 304 {OPT_BLKSIZE, "blksize=%u"}, 305 {OPT_ERR, NULL} 306 }; 307 308 static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) 309 { 310 char *p; 311 memset(d, 0, sizeof(struct fuse_mount_data)); 312 d->max_read = ~0; 313 d->blksize = 512; 314 315 while ((p = strsep(&opt, ",")) != NULL) { 316 int token; 317 int value; 318 substring_t args[MAX_OPT_ARGS]; 319 if (!*p) 320 continue; 321 322 token = match_token(p, tokens, args); 323 switch (token) { 324 case OPT_FD: 325 if (match_int(&args[0], &value)) 326 return 0; 327 d->fd = value; 328 d->fd_present = 1; 329 break; 330 331 case OPT_ROOTMODE: 332 if (match_octal(&args[0], &value)) 333 return 0; 334 if (!fuse_valid_type(value)) 335 return 0; 336 d->rootmode = value; 337 d->rootmode_present = 1; 338 break; 339 340 case OPT_USER_ID: 341 if (match_int(&args[0], &value)) 342 return 0; 343 d->user_id = value; 344 d->user_id_present = 1; 345 break; 346 347 case OPT_GROUP_ID: 348 if (match_int(&args[0], &value)) 349 return 0; 350 d->group_id = value; 351 d->group_id_present = 1; 352 break; 353 354 case OPT_DEFAULT_PERMISSIONS: 355 d->flags |= FUSE_DEFAULT_PERMISSIONS; 356 break; 357 358 case OPT_ALLOW_OTHER: 359 d->flags |= FUSE_ALLOW_OTHER; 360 break; 361 362 case OPT_MAX_READ: 363 if (match_int(&args[0], &value)) 364 return 0; 365 d->max_read = value; 366 break; 367 368 case OPT_BLKSIZE: 369 if (!is_bdev || match_int(&args[0], &value)) 370 return 0; 371 d->blksize = value; 372 break; 373 374 default: 375 return 0; 376 } 377 } 378 379 if (!d->fd_present || !d->rootmode_present || 380 !d->user_id_present || !d->group_id_present) 381 return 0; 382 383 return 1; 384 } 385 386 static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) 387 { 388 struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb); 389 390 seq_printf(m, ",user_id=%u", fc->user_id); 391 seq_printf(m, ",group_id=%u", fc->group_id); 392 if (fc->flags & FUSE_DEFAULT_PERMISSIONS) 393 seq_puts(m, ",default_permissions"); 394 if (fc->flags & FUSE_ALLOW_OTHER) 395 seq_puts(m, ",allow_other"); 396 if (fc->max_read != ~0) 397 seq_printf(m, ",max_read=%u", fc->max_read); 398 return 0; 399 } 400 401 static struct fuse_conn *new_conn(void) 402 { 403 struct fuse_conn *fc; 404 405 fc = kzalloc(sizeof(*fc), GFP_KERNEL); 406 if (fc) { 407 spin_lock_init(&fc->lock); 408 mutex_init(&fc->inst_mutex); 409 atomic_set(&fc->count, 1); 410 init_waitqueue_head(&fc->waitq); 411 init_waitqueue_head(&fc->blocked_waitq); 412 INIT_LIST_HEAD(&fc->pending); 413 INIT_LIST_HEAD(&fc->processing); 414 INIT_LIST_HEAD(&fc->io); 415 INIT_LIST_HEAD(&fc->interrupts); 416 atomic_set(&fc->num_waiting, 0); 417 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; 418 fc->bdi.unplug_io_fn = default_unplug_io_fn; 419 fc->reqctr = 0; 420 fc->blocked = 1; 421 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); 422 } 423 return fc; 424 } 425 426 void fuse_conn_put(struct fuse_conn *fc) 427 { 428 if (atomic_dec_and_test(&fc->count)) { 429 if (fc->destroy_req) 430 fuse_request_free(fc->destroy_req); 431 mutex_destroy(&fc->inst_mutex); 432 kfree(fc); 433 } 434 } 435 436 struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) 437 { 438 atomic_inc(&fc->count); 439 return fc; 440 } 441 442 static struct inode *get_root_inode(struct super_block *sb, unsigned mode) 443 { 444 struct fuse_attr attr; 445 memset(&attr, 0, sizeof(attr)); 446 447 attr.mode = mode; 448 attr.ino = FUSE_ROOT_ID; 449 return fuse_iget(sb, 1, 0, &attr); 450 } 451 452 static const struct super_operations fuse_super_operations = { 453 .alloc_inode = fuse_alloc_inode, 454 .destroy_inode = fuse_destroy_inode, 455 .read_inode = fuse_read_inode, 456 .clear_inode = fuse_clear_inode, 457 .drop_inode = generic_delete_inode, 458 .remount_fs = fuse_remount_fs, 459 .put_super = fuse_put_super, 460 .umount_begin = fuse_umount_begin, 461 .statfs = fuse_statfs, 462 .show_options = fuse_show_options, 463 }; 464 465 static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) 466 { 467 struct fuse_init_out *arg = &req->misc.init_out; 468 469 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) 470 fc->conn_error = 1; 471 else { 472 unsigned long ra_pages; 473 474 if (arg->minor >= 6) { 475 ra_pages = arg->max_readahead / PAGE_CACHE_SIZE; 476 if (arg->flags & FUSE_ASYNC_READ) 477 fc->async_read = 1; 478 if (!(arg->flags & FUSE_POSIX_LOCKS)) 479 fc->no_lock = 1; 480 } else { 481 ra_pages = fc->max_read / PAGE_CACHE_SIZE; 482 fc->no_lock = 1; 483 } 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 fc->conn_init = 1; 489 } 490 fuse_put_request(fc, req); 491 fc->blocked = 0; 492 wake_up_all(&fc->blocked_waitq); 493 } 494 495 static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) 496 { 497 struct fuse_init_in *arg = &req->misc.init_in; 498 499 arg->major = FUSE_KERNEL_VERSION; 500 arg->minor = FUSE_KERNEL_MINOR_VERSION; 501 arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE; 502 arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS; 503 req->in.h.opcode = FUSE_INIT; 504 req->in.numargs = 1; 505 req->in.args[0].size = sizeof(*arg); 506 req->in.args[0].value = arg; 507 req->out.numargs = 1; 508 /* Variable length arguement used for backward compatibility 509 with interface version < 7.5. Rest of init_out is zeroed 510 by do_get_request(), so a short reply is not a problem */ 511 req->out.argvar = 1; 512 req->out.args[0].size = sizeof(struct fuse_init_out); 513 req->out.args[0].value = &req->misc.init_out; 514 req->end = process_init_reply; 515 request_send_background(fc, req); 516 } 517 518 static u64 conn_id(void) 519 { 520 static u64 ctr = 1; 521 return ctr++; 522 } 523 524 static int fuse_fill_super(struct super_block *sb, void *data, int silent) 525 { 526 struct fuse_conn *fc; 527 struct inode *root; 528 struct fuse_mount_data d; 529 struct file *file; 530 struct dentry *root_dentry; 531 struct fuse_req *init_req; 532 int err; 533 int is_bdev = sb->s_bdev != NULL; 534 535 if (sb->s_flags & MS_MANDLOCK) 536 return -EINVAL; 537 538 if (!parse_fuse_opt((char *) data, &d, is_bdev)) 539 return -EINVAL; 540 541 if (is_bdev) { 542 #ifdef CONFIG_BLOCK 543 if (!sb_set_blocksize(sb, d.blksize)) 544 return -EINVAL; 545 #endif 546 } else { 547 sb->s_blocksize = PAGE_CACHE_SIZE; 548 sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 549 } 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 if (file->f_op != &fuse_dev_operations) 559 return -EINVAL; 560 561 fc = new_conn(); 562 if (!fc) 563 return -ENOMEM; 564 565 fc->flags = d.flags; 566 fc->user_id = d.user_id; 567 fc->group_id = d.group_id; 568 fc->max_read = d.max_read; 569 570 /* Used by get_root_inode() */ 571 sb->s_fs_info = fc; 572 573 err = -ENOMEM; 574 root = get_root_inode(sb, d.rootmode); 575 if (!root) 576 goto err; 577 578 root_dentry = d_alloc_root(root); 579 if (!root_dentry) { 580 iput(root); 581 goto err; 582 } 583 584 init_req = fuse_request_alloc(); 585 if (!init_req) 586 goto err_put_root; 587 588 if (is_bdev) { 589 fc->destroy_req = fuse_request_alloc(); 590 if (!fc->destroy_req) 591 goto err_put_root; 592 } 593 594 mutex_lock(&fuse_mutex); 595 err = -EINVAL; 596 if (file->private_data) 597 goto err_unlock; 598 599 fc->id = conn_id(); 600 err = fuse_ctl_add_conn(fc); 601 if (err) 602 goto err_unlock; 603 604 list_add_tail(&fc->entry, &fuse_conn_list); 605 sb->s_root = root_dentry; 606 fc->connected = 1; 607 file->private_data = fuse_conn_get(fc); 608 mutex_unlock(&fuse_mutex); 609 /* 610 * atomic_dec_and_test() in fput() provides the necessary 611 * memory barrier for file->private_data to be visible on all 612 * CPUs after this 613 */ 614 fput(file); 615 616 fuse_send_init(fc, init_req); 617 618 return 0; 619 620 err_unlock: 621 mutex_unlock(&fuse_mutex); 622 fuse_request_free(init_req); 623 err_put_root: 624 dput(root_dentry); 625 err: 626 fput(file); 627 fuse_conn_put(fc); 628 return err; 629 } 630 631 static int fuse_get_sb(struct file_system_type *fs_type, 632 int flags, const char *dev_name, 633 void *raw_data, struct vfsmount *mnt) 634 { 635 return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt); 636 } 637 638 static struct file_system_type fuse_fs_type = { 639 .owner = THIS_MODULE, 640 .name = "fuse", 641 .fs_flags = FS_HAS_SUBTYPE, 642 .get_sb = fuse_get_sb, 643 .kill_sb = kill_anon_super, 644 }; 645 646 #ifdef CONFIG_BLOCK 647 static int fuse_get_sb_blk(struct file_system_type *fs_type, 648 int flags, const char *dev_name, 649 void *raw_data, struct vfsmount *mnt) 650 { 651 return get_sb_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super, 652 mnt); 653 } 654 655 static struct file_system_type fuseblk_fs_type = { 656 .owner = THIS_MODULE, 657 .name = "fuseblk", 658 .get_sb = fuse_get_sb_blk, 659 .kill_sb = kill_block_super, 660 .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, 661 }; 662 663 static inline int register_fuseblk(void) 664 { 665 return register_filesystem(&fuseblk_fs_type); 666 } 667 668 static inline void unregister_fuseblk(void) 669 { 670 unregister_filesystem(&fuseblk_fs_type); 671 } 672 #else 673 static inline int register_fuseblk(void) 674 { 675 return 0; 676 } 677 678 static inline void unregister_fuseblk(void) 679 { 680 } 681 #endif 682 683 static decl_subsys(fuse, NULL, NULL); 684 static decl_subsys(connections, NULL, NULL); 685 686 static void fuse_inode_init_once(void *foo, struct kmem_cache *cachep, 687 unsigned long flags) 688 { 689 struct inode * inode = foo; 690 691 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); 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); 807