1 /* 2 * Copyright (C) 2007 Oracle. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public 6 * License v2 as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public 14 * License along with this program; if not, write to the 15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16 * Boston, MA 021110-1307, USA. 17 */ 18 19 #include <linux/blkdev.h> 20 #include <linux/module.h> 21 #include <linux/buffer_head.h> 22 #include <linux/fs.h> 23 #include <linux/pagemap.h> 24 #include <linux/highmem.h> 25 #include <linux/time.h> 26 #include <linux/init.h> 27 #include <linux/seq_file.h> 28 #include <linux/string.h> 29 #include <linux/backing-dev.h> 30 #include <linux/mount.h> 31 #include <linux/mpage.h> 32 #include <linux/swap.h> 33 #include <linux/writeback.h> 34 #include <linux/statfs.h> 35 #include <linux/compat.h> 36 #include <linux/parser.h> 37 #include <linux/ctype.h> 38 #include <linux/namei.h> 39 #include <linux/miscdevice.h> 40 #include <linux/magic.h> 41 #include "compat.h" 42 #include "ctree.h" 43 #include "disk-io.h" 44 #include "transaction.h" 45 #include "btrfs_inode.h" 46 #include "ioctl.h" 47 #include "print-tree.h" 48 #include "xattr.h" 49 #include "volumes.h" 50 #include "version.h" 51 #include "export.h" 52 #include "compression.h" 53 54 static const struct super_operations btrfs_super_ops; 55 56 static void btrfs_put_super(struct super_block *sb) 57 { 58 struct btrfs_root *root = btrfs_sb(sb); 59 int ret; 60 61 ret = close_ctree(root); 62 sb->s_fs_info = NULL; 63 } 64 65 enum { 66 Opt_degraded, Opt_subvol, Opt_device, Opt_nodatasum, Opt_nodatacow, 67 Opt_max_extent, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, 68 Opt_ssd, Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, 69 Opt_compress, Opt_compress_force, Opt_notreelog, Opt_ratio, 70 Opt_flushoncommit, 71 Opt_discard, Opt_err, 72 }; 73 74 static match_table_t tokens = { 75 {Opt_degraded, "degraded"}, 76 {Opt_subvol, "subvol=%s"}, 77 {Opt_device, "device=%s"}, 78 {Opt_nodatasum, "nodatasum"}, 79 {Opt_nodatacow, "nodatacow"}, 80 {Opt_nobarrier, "nobarrier"}, 81 {Opt_max_extent, "max_extent=%s"}, 82 {Opt_max_inline, "max_inline=%s"}, 83 {Opt_alloc_start, "alloc_start=%s"}, 84 {Opt_thread_pool, "thread_pool=%d"}, 85 {Opt_compress, "compress"}, 86 {Opt_compress_force, "compress-force"}, 87 {Opt_ssd, "ssd"}, 88 {Opt_ssd_spread, "ssd_spread"}, 89 {Opt_nossd, "nossd"}, 90 {Opt_noacl, "noacl"}, 91 {Opt_notreelog, "notreelog"}, 92 {Opt_flushoncommit, "flushoncommit"}, 93 {Opt_ratio, "metadata_ratio=%d"}, 94 {Opt_discard, "discard"}, 95 {Opt_err, NULL}, 96 }; 97 98 u64 btrfs_parse_size(char *str) 99 { 100 u64 res; 101 int mult = 1; 102 char *end; 103 char last; 104 105 res = simple_strtoul(str, &end, 10); 106 107 last = end[0]; 108 if (isalpha(last)) { 109 last = tolower(last); 110 switch (last) { 111 case 'g': 112 mult *= 1024; 113 case 'm': 114 mult *= 1024; 115 case 'k': 116 mult *= 1024; 117 } 118 res = res * mult; 119 } 120 return res; 121 } 122 123 /* 124 * Regular mount options parser. Everything that is needed only when 125 * reading in a new superblock is parsed here. 126 */ 127 int btrfs_parse_options(struct btrfs_root *root, char *options) 128 { 129 struct btrfs_fs_info *info = root->fs_info; 130 substring_t args[MAX_OPT_ARGS]; 131 char *p, *num; 132 int intarg; 133 int ret = 0; 134 135 if (!options) 136 return 0; 137 138 /* 139 * strsep changes the string, duplicate it because parse_options 140 * gets called twice 141 */ 142 options = kstrdup(options, GFP_NOFS); 143 if (!options) 144 return -ENOMEM; 145 146 147 while ((p = strsep(&options, ",")) != NULL) { 148 int token; 149 if (!*p) 150 continue; 151 152 token = match_token(p, tokens, args); 153 switch (token) { 154 case Opt_degraded: 155 printk(KERN_INFO "btrfs: allowing degraded mounts\n"); 156 btrfs_set_opt(info->mount_opt, DEGRADED); 157 break; 158 case Opt_subvol: 159 case Opt_device: 160 /* 161 * These are parsed by btrfs_parse_early_options 162 * and can be happily ignored here. 163 */ 164 break; 165 case Opt_nodatasum: 166 printk(KERN_INFO "btrfs: setting nodatasum\n"); 167 btrfs_set_opt(info->mount_opt, NODATASUM); 168 break; 169 case Opt_nodatacow: 170 printk(KERN_INFO "btrfs: setting nodatacow\n"); 171 btrfs_set_opt(info->mount_opt, NODATACOW); 172 btrfs_set_opt(info->mount_opt, NODATASUM); 173 break; 174 case Opt_compress: 175 printk(KERN_INFO "btrfs: use compression\n"); 176 btrfs_set_opt(info->mount_opt, COMPRESS); 177 break; 178 case Opt_compress_force: 179 printk(KERN_INFO "btrfs: forcing compression\n"); 180 btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); 181 btrfs_set_opt(info->mount_opt, COMPRESS); 182 break; 183 case Opt_ssd: 184 printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); 185 btrfs_set_opt(info->mount_opt, SSD); 186 break; 187 case Opt_ssd_spread: 188 printk(KERN_INFO "btrfs: use spread ssd " 189 "allocation scheme\n"); 190 btrfs_set_opt(info->mount_opt, SSD); 191 btrfs_set_opt(info->mount_opt, SSD_SPREAD); 192 break; 193 case Opt_nossd: 194 printk(KERN_INFO "btrfs: not using ssd allocation " 195 "scheme\n"); 196 btrfs_set_opt(info->mount_opt, NOSSD); 197 btrfs_clear_opt(info->mount_opt, SSD); 198 btrfs_clear_opt(info->mount_opt, SSD_SPREAD); 199 break; 200 case Opt_nobarrier: 201 printk(KERN_INFO "btrfs: turning off barriers\n"); 202 btrfs_set_opt(info->mount_opt, NOBARRIER); 203 break; 204 case Opt_thread_pool: 205 intarg = 0; 206 match_int(&args[0], &intarg); 207 if (intarg) { 208 info->thread_pool_size = intarg; 209 printk(KERN_INFO "btrfs: thread pool %d\n", 210 info->thread_pool_size); 211 } 212 break; 213 case Opt_max_extent: 214 num = match_strdup(&args[0]); 215 if (num) { 216 info->max_extent = btrfs_parse_size(num); 217 kfree(num); 218 219 info->max_extent = max_t(u64, 220 info->max_extent, root->sectorsize); 221 printk(KERN_INFO "btrfs: max_extent at %llu\n", 222 (unsigned long long)info->max_extent); 223 } 224 break; 225 case Opt_max_inline: 226 num = match_strdup(&args[0]); 227 if (num) { 228 info->max_inline = btrfs_parse_size(num); 229 kfree(num); 230 231 if (info->max_inline) { 232 info->max_inline = max_t(u64, 233 info->max_inline, 234 root->sectorsize); 235 } 236 printk(KERN_INFO "btrfs: max_inline at %llu\n", 237 (unsigned long long)info->max_inline); 238 } 239 break; 240 case Opt_alloc_start: 241 num = match_strdup(&args[0]); 242 if (num) { 243 info->alloc_start = btrfs_parse_size(num); 244 kfree(num); 245 printk(KERN_INFO 246 "btrfs: allocations start at %llu\n", 247 (unsigned long long)info->alloc_start); 248 } 249 break; 250 case Opt_noacl: 251 root->fs_info->sb->s_flags &= ~MS_POSIXACL; 252 break; 253 case Opt_notreelog: 254 printk(KERN_INFO "btrfs: disabling tree log\n"); 255 btrfs_set_opt(info->mount_opt, NOTREELOG); 256 break; 257 case Opt_flushoncommit: 258 printk(KERN_INFO "btrfs: turning on flush-on-commit\n"); 259 btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT); 260 break; 261 case Opt_ratio: 262 intarg = 0; 263 match_int(&args[0], &intarg); 264 if (intarg) { 265 info->metadata_ratio = intarg; 266 printk(KERN_INFO "btrfs: metadata ratio %d\n", 267 info->metadata_ratio); 268 } 269 break; 270 case Opt_discard: 271 btrfs_set_opt(info->mount_opt, DISCARD); 272 break; 273 case Opt_err: 274 printk(KERN_INFO "btrfs: unrecognized mount option " 275 "'%s'\n", p); 276 ret = -EINVAL; 277 goto out; 278 default: 279 break; 280 } 281 } 282 out: 283 kfree(options); 284 return ret; 285 } 286 287 /* 288 * Parse mount options that are required early in the mount process. 289 * 290 * All other options will be parsed on much later in the mount process and 291 * only when we need to allocate a new super block. 292 */ 293 static int btrfs_parse_early_options(const char *options, fmode_t flags, 294 void *holder, char **subvol_name, 295 struct btrfs_fs_devices **fs_devices) 296 { 297 substring_t args[MAX_OPT_ARGS]; 298 char *opts, *p; 299 int error = 0; 300 301 if (!options) 302 goto out; 303 304 /* 305 * strsep changes the string, duplicate it because parse_options 306 * gets called twice 307 */ 308 opts = kstrdup(options, GFP_KERNEL); 309 if (!opts) 310 return -ENOMEM; 311 312 while ((p = strsep(&opts, ",")) != NULL) { 313 int token; 314 if (!*p) 315 continue; 316 317 token = match_token(p, tokens, args); 318 switch (token) { 319 case Opt_subvol: 320 *subvol_name = match_strdup(&args[0]); 321 break; 322 case Opt_device: 323 error = btrfs_scan_one_device(match_strdup(&args[0]), 324 flags, holder, fs_devices); 325 if (error) 326 goto out_free_opts; 327 break; 328 default: 329 break; 330 } 331 } 332 333 out_free_opts: 334 kfree(opts); 335 out: 336 /* 337 * If no subvolume name is specified we use the default one. Allocate 338 * a copy of the string "." here so that code later in the 339 * mount path doesn't care if it's the default volume or another one. 340 */ 341 if (!*subvol_name) { 342 *subvol_name = kstrdup(".", GFP_KERNEL); 343 if (!*subvol_name) 344 return -ENOMEM; 345 } 346 return error; 347 } 348 349 static int btrfs_fill_super(struct super_block *sb, 350 struct btrfs_fs_devices *fs_devices, 351 void *data, int silent) 352 { 353 struct inode *inode; 354 struct dentry *root_dentry; 355 struct btrfs_super_block *disk_super; 356 struct btrfs_root *tree_root; 357 struct btrfs_key key; 358 int err; 359 360 sb->s_maxbytes = MAX_LFS_FILESIZE; 361 sb->s_magic = BTRFS_SUPER_MAGIC; 362 sb->s_op = &btrfs_super_ops; 363 sb->s_export_op = &btrfs_export_ops; 364 sb->s_xattr = btrfs_xattr_handlers; 365 sb->s_time_gran = 1; 366 #ifdef CONFIG_BTRFS_FS_POSIX_ACL 367 sb->s_flags |= MS_POSIXACL; 368 #endif 369 370 tree_root = open_ctree(sb, fs_devices, (char *)data); 371 372 if (IS_ERR(tree_root)) { 373 printk("btrfs: open_ctree failed\n"); 374 return PTR_ERR(tree_root); 375 } 376 sb->s_fs_info = tree_root; 377 disk_super = &tree_root->fs_info->super_copy; 378 379 key.objectid = BTRFS_FIRST_FREE_OBJECTID; 380 key.type = BTRFS_INODE_ITEM_KEY; 381 key.offset = 0; 382 inode = btrfs_iget(sb, &key, tree_root->fs_info->fs_root); 383 if (IS_ERR(inode)) { 384 err = PTR_ERR(inode); 385 goto fail_close; 386 } 387 388 root_dentry = d_alloc_root(inode); 389 if (!root_dentry) { 390 iput(inode); 391 err = -ENOMEM; 392 goto fail_close; 393 } 394 #if 0 395 /* this does the super kobj at the same time */ 396 err = btrfs_sysfs_add_super(tree_root->fs_info); 397 if (err) 398 goto fail_close; 399 #endif 400 401 sb->s_root = root_dentry; 402 403 save_mount_options(sb, data); 404 return 0; 405 406 fail_close: 407 close_ctree(tree_root); 408 return err; 409 } 410 411 int btrfs_sync_fs(struct super_block *sb, int wait) 412 { 413 struct btrfs_trans_handle *trans; 414 struct btrfs_root *root = btrfs_sb(sb); 415 int ret; 416 417 if (!wait) { 418 filemap_flush(root->fs_info->btree_inode->i_mapping); 419 return 0; 420 } 421 422 btrfs_start_delalloc_inodes(root, 0); 423 btrfs_wait_ordered_extents(root, 0, 0); 424 425 trans = btrfs_start_transaction(root, 1); 426 ret = btrfs_commit_transaction(trans, root); 427 return ret; 428 } 429 430 static int btrfs_show_options(struct seq_file *seq, struct vfsmount *vfs) 431 { 432 struct btrfs_root *root = btrfs_sb(vfs->mnt_sb); 433 struct btrfs_fs_info *info = root->fs_info; 434 435 if (btrfs_test_opt(root, DEGRADED)) 436 seq_puts(seq, ",degraded"); 437 if (btrfs_test_opt(root, NODATASUM)) 438 seq_puts(seq, ",nodatasum"); 439 if (btrfs_test_opt(root, NODATACOW)) 440 seq_puts(seq, ",nodatacow"); 441 if (btrfs_test_opt(root, NOBARRIER)) 442 seq_puts(seq, ",nobarrier"); 443 if (info->max_extent != (u64)-1) 444 seq_printf(seq, ",max_extent=%llu", 445 (unsigned long long)info->max_extent); 446 if (info->max_inline != 8192 * 1024) 447 seq_printf(seq, ",max_inline=%llu", 448 (unsigned long long)info->max_inline); 449 if (info->alloc_start != 0) 450 seq_printf(seq, ",alloc_start=%llu", 451 (unsigned long long)info->alloc_start); 452 if (info->thread_pool_size != min_t(unsigned long, 453 num_online_cpus() + 2, 8)) 454 seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); 455 if (btrfs_test_opt(root, COMPRESS)) 456 seq_puts(seq, ",compress"); 457 if (btrfs_test_opt(root, NOSSD)) 458 seq_puts(seq, ",nossd"); 459 if (btrfs_test_opt(root, SSD_SPREAD)) 460 seq_puts(seq, ",ssd_spread"); 461 else if (btrfs_test_opt(root, SSD)) 462 seq_puts(seq, ",ssd"); 463 if (btrfs_test_opt(root, NOTREELOG)) 464 seq_puts(seq, ",notreelog"); 465 if (btrfs_test_opt(root, FLUSHONCOMMIT)) 466 seq_puts(seq, ",flushoncommit"); 467 if (btrfs_test_opt(root, DISCARD)) 468 seq_puts(seq, ",discard"); 469 if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) 470 seq_puts(seq, ",noacl"); 471 return 0; 472 } 473 474 static int btrfs_test_super(struct super_block *s, void *data) 475 { 476 struct btrfs_fs_devices *test_fs_devices = data; 477 struct btrfs_root *root = btrfs_sb(s); 478 479 return root->fs_info->fs_devices == test_fs_devices; 480 } 481 482 /* 483 * Find a superblock for the given device / mount point. 484 * 485 * Note: This is based on get_sb_bdev from fs/super.c with a few additions 486 * for multiple device setup. Make sure to keep it in sync. 487 */ 488 static int btrfs_get_sb(struct file_system_type *fs_type, int flags, 489 const char *dev_name, void *data, struct vfsmount *mnt) 490 { 491 char *subvol_name = NULL; 492 struct block_device *bdev = NULL; 493 struct super_block *s; 494 struct dentry *root; 495 struct btrfs_fs_devices *fs_devices = NULL; 496 fmode_t mode = FMODE_READ; 497 int error = 0; 498 499 if (!(flags & MS_RDONLY)) 500 mode |= FMODE_WRITE; 501 502 error = btrfs_parse_early_options(data, mode, fs_type, 503 &subvol_name, &fs_devices); 504 if (error) 505 return error; 506 507 error = btrfs_scan_one_device(dev_name, mode, fs_type, &fs_devices); 508 if (error) 509 goto error_free_subvol_name; 510 511 error = btrfs_open_devices(fs_devices, mode, fs_type); 512 if (error) 513 goto error_free_subvol_name; 514 515 if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { 516 error = -EACCES; 517 goto error_close_devices; 518 } 519 520 bdev = fs_devices->latest_bdev; 521 s = sget(fs_type, btrfs_test_super, set_anon_super, fs_devices); 522 if (IS_ERR(s)) 523 goto error_s; 524 525 if (s->s_root) { 526 if ((flags ^ s->s_flags) & MS_RDONLY) { 527 deactivate_locked_super(s); 528 error = -EBUSY; 529 goto error_close_devices; 530 } 531 532 btrfs_close_devices(fs_devices); 533 } else { 534 char b[BDEVNAME_SIZE]; 535 536 s->s_flags = flags; 537 strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); 538 error = btrfs_fill_super(s, fs_devices, data, 539 flags & MS_SILENT ? 1 : 0); 540 if (error) { 541 deactivate_locked_super(s); 542 goto error_free_subvol_name; 543 } 544 545 btrfs_sb(s)->fs_info->bdev_holder = fs_type; 546 s->s_flags |= MS_ACTIVE; 547 } 548 549 if (!strcmp(subvol_name, ".")) 550 root = dget(s->s_root); 551 else { 552 mutex_lock(&s->s_root->d_inode->i_mutex); 553 root = lookup_one_len(subvol_name, s->s_root, 554 strlen(subvol_name)); 555 mutex_unlock(&s->s_root->d_inode->i_mutex); 556 557 if (IS_ERR(root)) { 558 deactivate_locked_super(s); 559 error = PTR_ERR(root); 560 goto error_free_subvol_name; 561 } 562 if (!root->d_inode) { 563 dput(root); 564 deactivate_locked_super(s); 565 error = -ENXIO; 566 goto error_free_subvol_name; 567 } 568 } 569 570 mnt->mnt_sb = s; 571 mnt->mnt_root = root; 572 573 kfree(subvol_name); 574 return 0; 575 576 error_s: 577 error = PTR_ERR(s); 578 error_close_devices: 579 btrfs_close_devices(fs_devices); 580 error_free_subvol_name: 581 kfree(subvol_name); 582 return error; 583 } 584 585 static int btrfs_remount(struct super_block *sb, int *flags, char *data) 586 { 587 struct btrfs_root *root = btrfs_sb(sb); 588 int ret; 589 590 ret = btrfs_parse_options(root, data); 591 if (ret) 592 return -EINVAL; 593 594 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 595 return 0; 596 597 if (*flags & MS_RDONLY) { 598 sb->s_flags |= MS_RDONLY; 599 600 ret = btrfs_commit_super(root); 601 WARN_ON(ret); 602 } else { 603 if (root->fs_info->fs_devices->rw_devices == 0) 604 return -EACCES; 605 606 if (btrfs_super_log_root(&root->fs_info->super_copy) != 0) 607 return -EINVAL; 608 609 /* recover relocation */ 610 ret = btrfs_recover_relocation(root); 611 WARN_ON(ret); 612 613 ret = btrfs_cleanup_fs_roots(root->fs_info); 614 WARN_ON(ret); 615 616 sb->s_flags &= ~MS_RDONLY; 617 } 618 619 return 0; 620 } 621 622 static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) 623 { 624 struct btrfs_root *root = btrfs_sb(dentry->d_sb); 625 struct btrfs_super_block *disk_super = &root->fs_info->super_copy; 626 int bits = dentry->d_sb->s_blocksize_bits; 627 __be32 *fsid = (__be32 *)root->fs_info->fsid; 628 629 buf->f_namelen = BTRFS_NAME_LEN; 630 buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; 631 buf->f_bfree = buf->f_blocks - 632 (btrfs_super_bytes_used(disk_super) >> bits); 633 buf->f_bavail = buf->f_bfree; 634 buf->f_bsize = dentry->d_sb->s_blocksize; 635 buf->f_type = BTRFS_SUPER_MAGIC; 636 637 /* We treat it as constant endianness (it doesn't matter _which_) 638 because we want the fsid to come out the same whether mounted 639 on a big-endian or little-endian host */ 640 buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); 641 buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); 642 /* Mask in the root object ID too, to disambiguate subvols */ 643 buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; 644 buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; 645 646 return 0; 647 } 648 649 static struct file_system_type btrfs_fs_type = { 650 .owner = THIS_MODULE, 651 .name = "btrfs", 652 .get_sb = btrfs_get_sb, 653 .kill_sb = kill_anon_super, 654 .fs_flags = FS_REQUIRES_DEV, 655 }; 656 657 /* 658 * used by btrfsctl to scan devices when no FS is mounted 659 */ 660 static long btrfs_control_ioctl(struct file *file, unsigned int cmd, 661 unsigned long arg) 662 { 663 struct btrfs_ioctl_vol_args *vol; 664 struct btrfs_fs_devices *fs_devices; 665 int ret = -ENOTTY; 666 667 if (!capable(CAP_SYS_ADMIN)) 668 return -EPERM; 669 670 vol = memdup_user((void __user *)arg, sizeof(*vol)); 671 if (IS_ERR(vol)) 672 return PTR_ERR(vol); 673 674 switch (cmd) { 675 case BTRFS_IOC_SCAN_DEV: 676 ret = btrfs_scan_one_device(vol->name, FMODE_READ, 677 &btrfs_fs_type, &fs_devices); 678 break; 679 } 680 681 kfree(vol); 682 return ret; 683 } 684 685 static int btrfs_freeze(struct super_block *sb) 686 { 687 struct btrfs_root *root = btrfs_sb(sb); 688 mutex_lock(&root->fs_info->transaction_kthread_mutex); 689 mutex_lock(&root->fs_info->cleaner_mutex); 690 return 0; 691 } 692 693 static int btrfs_unfreeze(struct super_block *sb) 694 { 695 struct btrfs_root *root = btrfs_sb(sb); 696 mutex_unlock(&root->fs_info->cleaner_mutex); 697 mutex_unlock(&root->fs_info->transaction_kthread_mutex); 698 return 0; 699 } 700 701 static const struct super_operations btrfs_super_ops = { 702 .drop_inode = btrfs_drop_inode, 703 .delete_inode = btrfs_delete_inode, 704 .put_super = btrfs_put_super, 705 .sync_fs = btrfs_sync_fs, 706 .show_options = btrfs_show_options, 707 .write_inode = btrfs_write_inode, 708 .dirty_inode = btrfs_dirty_inode, 709 .alloc_inode = btrfs_alloc_inode, 710 .destroy_inode = btrfs_destroy_inode, 711 .statfs = btrfs_statfs, 712 .remount_fs = btrfs_remount, 713 .freeze_fs = btrfs_freeze, 714 .unfreeze_fs = btrfs_unfreeze, 715 }; 716 717 static const struct file_operations btrfs_ctl_fops = { 718 .unlocked_ioctl = btrfs_control_ioctl, 719 .compat_ioctl = btrfs_control_ioctl, 720 .owner = THIS_MODULE, 721 }; 722 723 static struct miscdevice btrfs_misc = { 724 .minor = MISC_DYNAMIC_MINOR, 725 .name = "btrfs-control", 726 .fops = &btrfs_ctl_fops 727 }; 728 729 static int btrfs_interface_init(void) 730 { 731 return misc_register(&btrfs_misc); 732 } 733 734 static void btrfs_interface_exit(void) 735 { 736 if (misc_deregister(&btrfs_misc) < 0) 737 printk(KERN_INFO "misc_deregister failed for control device"); 738 } 739 740 static int __init init_btrfs_fs(void) 741 { 742 int err; 743 744 err = btrfs_init_sysfs(); 745 if (err) 746 return err; 747 748 err = btrfs_init_cachep(); 749 if (err) 750 goto free_sysfs; 751 752 err = extent_io_init(); 753 if (err) 754 goto free_cachep; 755 756 err = extent_map_init(); 757 if (err) 758 goto free_extent_io; 759 760 err = btrfs_interface_init(); 761 if (err) 762 goto free_extent_map; 763 764 err = register_filesystem(&btrfs_fs_type); 765 if (err) 766 goto unregister_ioctl; 767 768 printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION); 769 return 0; 770 771 unregister_ioctl: 772 btrfs_interface_exit(); 773 free_extent_map: 774 extent_map_exit(); 775 free_extent_io: 776 extent_io_exit(); 777 free_cachep: 778 btrfs_destroy_cachep(); 779 free_sysfs: 780 btrfs_exit_sysfs(); 781 return err; 782 } 783 784 static void __exit exit_btrfs_fs(void) 785 { 786 btrfs_destroy_cachep(); 787 extent_map_exit(); 788 extent_io_exit(); 789 btrfs_interface_exit(); 790 unregister_filesystem(&btrfs_fs_type); 791 btrfs_exit_sysfs(); 792 btrfs_cleanup_fs_uuids(); 793 btrfs_zlib_exit(); 794 } 795 796 module_init(init_btrfs_fs) 797 module_exit(exit_btrfs_fs) 798 799 MODULE_LICENSE("GPL"); 800