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 d->rootmode = value; 334 d->rootmode_present = 1; 335 break; 336 337 case OPT_USER_ID: 338 if (match_int(&args[0], &value)) 339 return 0; 340 d->user_id = value; 341 d->user_id_present = 1; 342 break; 343 344 case OPT_GROUP_ID: 345 if (match_int(&args[0], &value)) 346 return 0; 347 d->group_id = value; 348 d->group_id_present = 1; 349 break; 350 351 case OPT_DEFAULT_PERMISSIONS: 352 d->flags |= FUSE_DEFAULT_PERMISSIONS; 353 break; 354 355 case OPT_ALLOW_OTHER: 356 d->flags |= FUSE_ALLOW_OTHER; 357 break; 358 359 case OPT_MAX_READ: 360 if (match_int(&args[0], &value)) 361 return 0; 362 d->max_read = value; 363 break; 364 365 case OPT_BLKSIZE: 366 if (!is_bdev || match_int(&args[0], &value)) 367 return 0; 368 d->blksize = value; 369 break; 370 371 default: 372 return 0; 373 } 374 } 375 376 if (!d->fd_present || !d->rootmode_present || 377 !d->user_id_present || !d->group_id_present) 378 return 0; 379 380 return 1; 381 } 382 383 static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) 384 { 385 struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb); 386 387 seq_printf(m, ",user_id=%u", fc->user_id); 388 seq_printf(m, ",group_id=%u", fc->group_id); 389 if (fc->flags & FUSE_DEFAULT_PERMISSIONS) 390 seq_puts(m, ",default_permissions"); 391 if (fc->flags & FUSE_ALLOW_OTHER) 392 seq_puts(m, ",allow_other"); 393 if (fc->max_read != ~0) 394 seq_printf(m, ",max_read=%u", fc->max_read); 395 return 0; 396 } 397 398 static struct fuse_conn *new_conn(void) 399 { 400 struct fuse_conn *fc; 401 402 fc = kzalloc(sizeof(*fc), GFP_KERNEL); 403 if (fc) { 404 spin_lock_init(&fc->lock); 405 mutex_init(&fc->inst_mutex); 406 atomic_set(&fc->count, 1); 407 init_waitqueue_head(&fc->waitq); 408 init_waitqueue_head(&fc->blocked_waitq); 409 INIT_LIST_HEAD(&fc->pending); 410 INIT_LIST_HEAD(&fc->processing); 411 INIT_LIST_HEAD(&fc->io); 412 INIT_LIST_HEAD(&fc->interrupts); 413 atomic_set(&fc->num_waiting, 0); 414 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; 415 fc->bdi.unplug_io_fn = default_unplug_io_fn; 416 fc->reqctr = 0; 417 fc->blocked = 1; 418 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); 419 } 420 return fc; 421 } 422 423 void fuse_conn_put(struct fuse_conn *fc) 424 { 425 if (atomic_dec_and_test(&fc->count)) { 426 if (fc->destroy_req) 427 fuse_request_free(fc->destroy_req); 428 mutex_destroy(&fc->inst_mutex); 429 kfree(fc); 430 } 431 } 432 433 struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) 434 { 435 atomic_inc(&fc->count); 436 return fc; 437 } 438 439 static struct inode *get_root_inode(struct super_block *sb, unsigned mode) 440 { 441 struct fuse_attr attr; 442 memset(&attr, 0, sizeof(attr)); 443 444 attr.mode = mode; 445 attr.ino = FUSE_ROOT_ID; 446 return fuse_iget(sb, 1, 0, &attr); 447 } 448 449 static const struct super_operations fuse_super_operations = { 450 .alloc_inode = fuse_alloc_inode, 451 .destroy_inode = fuse_destroy_inode, 452 .read_inode = fuse_read_inode, 453 .clear_inode = fuse_clear_inode, 454 .remount_fs = fuse_remount_fs, 455 .put_super = fuse_put_super, 456 .umount_begin = fuse_umount_begin, 457 .statfs = fuse_statfs, 458 .show_options = fuse_show_options, 459 }; 460 461 static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) 462 { 463 struct fuse_init_out *arg = &req->misc.init_out; 464 465 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) 466 fc->conn_error = 1; 467 else { 468 unsigned long ra_pages; 469 470 if (arg->minor >= 6) { 471 ra_pages = arg->max_readahead / PAGE_CACHE_SIZE; 472 if (arg->flags & FUSE_ASYNC_READ) 473 fc->async_read = 1; 474 if (!(arg->flags & FUSE_POSIX_LOCKS)) 475 fc->no_lock = 1; 476 } else { 477 ra_pages = fc->max_read / PAGE_CACHE_SIZE; 478 fc->no_lock = 1; 479 } 480 481 fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); 482 fc->minor = arg->minor; 483 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; 484 fc->conn_init = 1; 485 } 486 fuse_put_request(fc, req); 487 fc->blocked = 0; 488 wake_up_all(&fc->blocked_waitq); 489 } 490 491 static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) 492 { 493 struct fuse_init_in *arg = &req->misc.init_in; 494 495 arg->major = FUSE_KERNEL_VERSION; 496 arg->minor = FUSE_KERNEL_MINOR_VERSION; 497 arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE; 498 arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS; 499 req->in.h.opcode = FUSE_INIT; 500 req->in.numargs = 1; 501 req->in.args[0].size = sizeof(*arg); 502 req->in.args[0].value = arg; 503 req->out.numargs = 1; 504 /* Variable length arguement used for backward compatibility 505 with interface version < 7.5. Rest of init_out is zeroed 506 by do_get_request(), so a short reply is not a problem */ 507 req->out.argvar = 1; 508 req->out.args[0].size = sizeof(struct fuse_init_out); 509 req->out.args[0].value = &req->misc.init_out; 510 req->end = process_init_reply; 511 request_send_background(fc, req); 512 } 513 514 static u64 conn_id(void) 515 { 516 static u64 ctr = 1; 517 return ctr++; 518 } 519 520 static int fuse_fill_super(struct super_block *sb, void *data, int silent) 521 { 522 struct fuse_conn *fc; 523 struct inode *root; 524 struct fuse_mount_data d; 525 struct file *file; 526 struct dentry *root_dentry; 527 struct fuse_req *init_req; 528 int err; 529 int is_bdev = sb->s_bdev != NULL; 530 531 if (sb->s_flags & MS_MANDLOCK) 532 return -EINVAL; 533 534 if (!parse_fuse_opt((char *) data, &d, is_bdev)) 535 return -EINVAL; 536 537 if (is_bdev) { 538 #ifdef CONFIG_BLOCK 539 if (!sb_set_blocksize(sb, d.blksize)) 540 return -EINVAL; 541 #endif 542 } else { 543 sb->s_blocksize = PAGE_CACHE_SIZE; 544 sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 545 } 546 sb->s_magic = FUSE_SUPER_MAGIC; 547 sb->s_op = &fuse_super_operations; 548 sb->s_maxbytes = MAX_LFS_FILESIZE; 549 550 file = fget(d.fd); 551 if (!file) 552 return -EINVAL; 553 554 if (file->f_op != &fuse_dev_operations) 555 return -EINVAL; 556 557 fc = new_conn(); 558 if (!fc) 559 return -ENOMEM; 560 561 fc->flags = d.flags; 562 fc->user_id = d.user_id; 563 fc->group_id = d.group_id; 564 fc->max_read = d.max_read; 565 566 /* Used by get_root_inode() */ 567 sb->s_fs_info = fc; 568 569 err = -ENOMEM; 570 root = get_root_inode(sb, d.rootmode); 571 if (!root) 572 goto err; 573 574 root_dentry = d_alloc_root(root); 575 if (!root_dentry) { 576 iput(root); 577 goto err; 578 } 579 580 init_req = fuse_request_alloc(); 581 if (!init_req) 582 goto err_put_root; 583 584 if (is_bdev) { 585 fc->destroy_req = fuse_request_alloc(); 586 if (!fc->destroy_req) 587 goto err_put_root; 588 } 589 590 mutex_lock(&fuse_mutex); 591 err = -EINVAL; 592 if (file->private_data) 593 goto err_unlock; 594 595 fc->id = conn_id(); 596 err = fuse_ctl_add_conn(fc); 597 if (err) 598 goto err_unlock; 599 600 list_add_tail(&fc->entry, &fuse_conn_list); 601 sb->s_root = root_dentry; 602 fc->connected = 1; 603 file->private_data = fuse_conn_get(fc); 604 mutex_unlock(&fuse_mutex); 605 /* 606 * atomic_dec_and_test() in fput() provides the necessary 607 * memory barrier for file->private_data to be visible on all 608 * CPUs after this 609 */ 610 fput(file); 611 612 fuse_send_init(fc, init_req); 613 614 return 0; 615 616 err_unlock: 617 mutex_unlock(&fuse_mutex); 618 fuse_request_free(init_req); 619 err_put_root: 620 dput(root_dentry); 621 err: 622 fput(file); 623 fuse_conn_put(fc); 624 return err; 625 } 626 627 static int fuse_get_sb(struct file_system_type *fs_type, 628 int flags, const char *dev_name, 629 void *raw_data, struct vfsmount *mnt) 630 { 631 return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt); 632 } 633 634 static struct file_system_type fuse_fs_type = { 635 .owner = THIS_MODULE, 636 .name = "fuse", 637 .get_sb = fuse_get_sb, 638 .kill_sb = kill_anon_super, 639 }; 640 641 #ifdef CONFIG_BLOCK 642 static int fuse_get_sb_blk(struct file_system_type *fs_type, 643 int flags, const char *dev_name, 644 void *raw_data, struct vfsmount *mnt) 645 { 646 return get_sb_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super, 647 mnt); 648 } 649 650 static struct file_system_type fuseblk_fs_type = { 651 .owner = THIS_MODULE, 652 .name = "fuseblk", 653 .get_sb = fuse_get_sb_blk, 654 .kill_sb = kill_block_super, 655 .fs_flags = FS_REQUIRES_DEV, 656 }; 657 658 static inline int register_fuseblk(void) 659 { 660 return register_filesystem(&fuseblk_fs_type); 661 } 662 663 static inline void unregister_fuseblk(void) 664 { 665 unregister_filesystem(&fuseblk_fs_type); 666 } 667 #else 668 static inline int register_fuseblk(void) 669 { 670 return 0; 671 } 672 673 static inline void unregister_fuseblk(void) 674 { 675 } 676 #endif 677 678 static decl_subsys(fuse, NULL, NULL); 679 static decl_subsys(connections, NULL, NULL); 680 681 static void fuse_inode_init_once(void *foo, struct kmem_cache *cachep, 682 unsigned long flags) 683 { 684 struct inode * inode = foo; 685 686 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 687 SLAB_CTOR_CONSTRUCTOR) 688 inode_init_once(inode); 689 } 690 691 static int __init fuse_fs_init(void) 692 { 693 int err; 694 695 err = register_filesystem(&fuse_fs_type); 696 if (err) 697 goto out; 698 699 err = register_fuseblk(); 700 if (err) 701 goto out_unreg; 702 703 fuse_inode_cachep = kmem_cache_create("fuse_inode", 704 sizeof(struct fuse_inode), 705 0, SLAB_HWCACHE_ALIGN, 706 fuse_inode_init_once, NULL); 707 err = -ENOMEM; 708 if (!fuse_inode_cachep) 709 goto out_unreg2; 710 711 return 0; 712 713 out_unreg2: 714 unregister_fuseblk(); 715 out_unreg: 716 unregister_filesystem(&fuse_fs_type); 717 out: 718 return err; 719 } 720 721 static void fuse_fs_cleanup(void) 722 { 723 unregister_filesystem(&fuse_fs_type); 724 unregister_fuseblk(); 725 kmem_cache_destroy(fuse_inode_cachep); 726 } 727 728 static int fuse_sysfs_init(void) 729 { 730 int err; 731 732 kset_set_kset_s(&fuse_subsys, fs_subsys); 733 err = subsystem_register(&fuse_subsys); 734 if (err) 735 goto out_err; 736 737 kset_set_kset_s(&connections_subsys, fuse_subsys); 738 err = subsystem_register(&connections_subsys); 739 if (err) 740 goto out_fuse_unregister; 741 742 return 0; 743 744 out_fuse_unregister: 745 subsystem_unregister(&fuse_subsys); 746 out_err: 747 return err; 748 } 749 750 static void fuse_sysfs_cleanup(void) 751 { 752 subsystem_unregister(&connections_subsys); 753 subsystem_unregister(&fuse_subsys); 754 } 755 756 static int __init fuse_init(void) 757 { 758 int res; 759 760 printk("fuse init (API version %i.%i)\n", 761 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); 762 763 INIT_LIST_HEAD(&fuse_conn_list); 764 res = fuse_fs_init(); 765 if (res) 766 goto err; 767 768 res = fuse_dev_init(); 769 if (res) 770 goto err_fs_cleanup; 771 772 res = fuse_sysfs_init(); 773 if (res) 774 goto err_dev_cleanup; 775 776 res = fuse_ctl_init(); 777 if (res) 778 goto err_sysfs_cleanup; 779 780 return 0; 781 782 err_sysfs_cleanup: 783 fuse_sysfs_cleanup(); 784 err_dev_cleanup: 785 fuse_dev_cleanup(); 786 err_fs_cleanup: 787 fuse_fs_cleanup(); 788 err: 789 return res; 790 } 791 792 static void __exit fuse_exit(void) 793 { 794 printk(KERN_DEBUG "fuse exit\n"); 795 796 fuse_ctl_cleanup(); 797 fuse_sysfs_cleanup(); 798 fuse_fs_cleanup(); 799 fuse_dev_cleanup(); 800 } 801 802 module_init(fuse_init); 803 module_exit(fuse_exit); 804