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 <linux/slab.h> 42 #include <linux/cleancache.h> 43 #include <linux/ratelimit.h> 44 #include <linux/btrfs.h> 45 #include "delayed-inode.h" 46 #include "ctree.h" 47 #include "disk-io.h" 48 #include "transaction.h" 49 #include "btrfs_inode.h" 50 #include "print-tree.h" 51 #include "hash.h" 52 #include "props.h" 53 #include "xattr.h" 54 #include "volumes.h" 55 #include "export.h" 56 #include "compression.h" 57 #include "rcu-string.h" 58 #include "dev-replace.h" 59 #include "free-space-cache.h" 60 #include "backref.h" 61 #include "tests/btrfs-tests.h" 62 63 #define CREATE_TRACE_POINTS 64 #include <trace/events/btrfs.h> 65 66 static const struct super_operations btrfs_super_ops; 67 static struct file_system_type btrfs_fs_type; 68 69 static int btrfs_remount(struct super_block *sb, int *flags, char *data); 70 71 static const char *btrfs_decode_error(int errno) 72 { 73 char *errstr = "unknown"; 74 75 switch (errno) { 76 case -EIO: 77 errstr = "IO failure"; 78 break; 79 case -ENOMEM: 80 errstr = "Out of memory"; 81 break; 82 case -EROFS: 83 errstr = "Readonly filesystem"; 84 break; 85 case -EEXIST: 86 errstr = "Object already exists"; 87 break; 88 case -ENOSPC: 89 errstr = "No space left"; 90 break; 91 case -ENOENT: 92 errstr = "No such entry"; 93 break; 94 } 95 96 return errstr; 97 } 98 99 static void save_error_info(struct btrfs_fs_info *fs_info) 100 { 101 /* 102 * today we only save the error info into ram. Long term we'll 103 * also send it down to the disk 104 */ 105 set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); 106 } 107 108 /* btrfs handle error by forcing the filesystem readonly */ 109 static void btrfs_handle_error(struct btrfs_fs_info *fs_info) 110 { 111 struct super_block *sb = fs_info->sb; 112 113 if (sb->s_flags & MS_RDONLY) 114 return; 115 116 if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { 117 sb->s_flags |= MS_RDONLY; 118 btrfs_info(fs_info, "forced readonly"); 119 /* 120 * Note that a running device replace operation is not 121 * canceled here although there is no way to update 122 * the progress. It would add the risk of a deadlock, 123 * therefore the canceling is ommited. The only penalty 124 * is that some I/O remains active until the procedure 125 * completes. The next time when the filesystem is 126 * mounted writeable again, the device replace 127 * operation continues. 128 */ 129 } 130 } 131 132 #ifdef CONFIG_PRINTK 133 /* 134 * __btrfs_std_error decodes expected errors from the caller and 135 * invokes the approciate error response. 136 */ 137 void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, 138 unsigned int line, int errno, const char *fmt, ...) 139 { 140 struct super_block *sb = fs_info->sb; 141 const char *errstr; 142 143 /* 144 * Special case: if the error is EROFS, and we're already 145 * under MS_RDONLY, then it is safe here. 146 */ 147 if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) 148 return; 149 150 errstr = btrfs_decode_error(errno); 151 if (fmt) { 152 struct va_format vaf; 153 va_list args; 154 155 va_start(args, fmt); 156 vaf.fmt = fmt; 157 vaf.va = &args; 158 159 printk(KERN_CRIT 160 "BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n", 161 sb->s_id, function, line, errno, errstr, &vaf); 162 va_end(args); 163 } else { 164 printk(KERN_CRIT "BTRFS: error (device %s) in %s:%d: errno=%d %s\n", 165 sb->s_id, function, line, errno, errstr); 166 } 167 168 /* Don't go through full error handling during mount */ 169 save_error_info(fs_info); 170 if (sb->s_flags & MS_BORN) 171 btrfs_handle_error(fs_info); 172 } 173 174 static const char * const logtypes[] = { 175 "emergency", 176 "alert", 177 "critical", 178 "error", 179 "warning", 180 "notice", 181 "info", 182 "debug", 183 }; 184 185 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) 186 { 187 struct super_block *sb = fs_info->sb; 188 char lvl[4]; 189 struct va_format vaf; 190 va_list args; 191 const char *type = logtypes[4]; 192 int kern_level; 193 194 va_start(args, fmt); 195 196 kern_level = printk_get_level(fmt); 197 if (kern_level) { 198 size_t size = printk_skip_level(fmt) - fmt; 199 memcpy(lvl, fmt, size); 200 lvl[size] = '\0'; 201 fmt += size; 202 type = logtypes[kern_level - '0']; 203 } else 204 *lvl = '\0'; 205 206 vaf.fmt = fmt; 207 vaf.va = &args; 208 209 printk("%sBTRFS %s (device %s): %pV\n", lvl, type, sb->s_id, &vaf); 210 211 va_end(args); 212 } 213 214 #else 215 216 void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, 217 unsigned int line, int errno, const char *fmt, ...) 218 { 219 struct super_block *sb = fs_info->sb; 220 221 /* 222 * Special case: if the error is EROFS, and we're already 223 * under MS_RDONLY, then it is safe here. 224 */ 225 if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) 226 return; 227 228 /* Don't go through full error handling during mount */ 229 if (sb->s_flags & MS_BORN) { 230 save_error_info(fs_info); 231 btrfs_handle_error(fs_info); 232 } 233 } 234 #endif 235 236 /* 237 * We only mark the transaction aborted and then set the file system read-only. 238 * This will prevent new transactions from starting or trying to join this 239 * one. 240 * 241 * This means that error recovery at the call site is limited to freeing 242 * any local memory allocations and passing the error code up without 243 * further cleanup. The transaction should complete as it normally would 244 * in the call path but will return -EIO. 245 * 246 * We'll complete the cleanup in btrfs_end_transaction and 247 * btrfs_commit_transaction. 248 */ 249 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, 250 struct btrfs_root *root, const char *function, 251 unsigned int line, int errno) 252 { 253 /* 254 * Report first abort since mount 255 */ 256 if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED, 257 &root->fs_info->fs_state)) { 258 WARN(1, KERN_DEBUG "BTRFS: Transaction aborted (error %d)\n", 259 errno); 260 } 261 trans->aborted = errno; 262 /* Nothing used. The other threads that have joined this 263 * transaction may be able to continue. */ 264 if (!trans->blocks_used) { 265 const char *errstr; 266 267 errstr = btrfs_decode_error(errno); 268 btrfs_warn(root->fs_info, 269 "%s:%d: Aborting unused transaction(%s).", 270 function, line, errstr); 271 return; 272 } 273 ACCESS_ONCE(trans->transaction->aborted) = errno; 274 /* Wake up anybody who may be waiting on this transaction */ 275 wake_up(&root->fs_info->transaction_wait); 276 wake_up(&root->fs_info->transaction_blocked_wait); 277 __btrfs_std_error(root->fs_info, function, line, errno, NULL); 278 } 279 /* 280 * __btrfs_panic decodes unexpected, fatal errors from the caller, 281 * issues an alert, and either panics or BUGs, depending on mount options. 282 */ 283 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, 284 unsigned int line, int errno, const char *fmt, ...) 285 { 286 char *s_id = "<unknown>"; 287 const char *errstr; 288 struct va_format vaf = { .fmt = fmt }; 289 va_list args; 290 291 if (fs_info) 292 s_id = fs_info->sb->s_id; 293 294 va_start(args, fmt); 295 vaf.va = &args; 296 297 errstr = btrfs_decode_error(errno); 298 if (fs_info && (fs_info->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR)) 299 panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", 300 s_id, function, line, &vaf, errno, errstr); 301 302 btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)", 303 function, line, &vaf, errno, errstr); 304 va_end(args); 305 /* Caller calls BUG() */ 306 } 307 308 static void btrfs_put_super(struct super_block *sb) 309 { 310 (void)close_ctree(btrfs_sb(sb)->tree_root); 311 /* FIXME: need to fix VFS to return error? */ 312 /* AV: return it _where_? ->put_super() can be triggered by any number 313 * of async events, up to and including delivery of SIGKILL to the 314 * last process that kept it busy. Or segfault in the aforementioned 315 * process... Whom would you report that to? 316 */ 317 } 318 319 enum { 320 Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, 321 Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, 322 Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, 323 Opt_compress_type, Opt_compress_force, Opt_compress_force_type, 324 Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, 325 Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed, 326 Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, Opt_inode_cache, 327 Opt_no_space_cache, Opt_recovery, Opt_skip_balance, 328 Opt_check_integrity, Opt_check_integrity_including_extent_data, 329 Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree, 330 Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard, 331 Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow, 332 Opt_datasum, Opt_treelog, Opt_noinode_cache, 333 Opt_err, 334 }; 335 336 static match_table_t tokens = { 337 {Opt_degraded, "degraded"}, 338 {Opt_subvol, "subvol=%s"}, 339 {Opt_subvolid, "subvolid=%s"}, 340 {Opt_device, "device=%s"}, 341 {Opt_nodatasum, "nodatasum"}, 342 {Opt_datasum, "datasum"}, 343 {Opt_nodatacow, "nodatacow"}, 344 {Opt_datacow, "datacow"}, 345 {Opt_nobarrier, "nobarrier"}, 346 {Opt_barrier, "barrier"}, 347 {Opt_max_inline, "max_inline=%s"}, 348 {Opt_alloc_start, "alloc_start=%s"}, 349 {Opt_thread_pool, "thread_pool=%d"}, 350 {Opt_compress, "compress"}, 351 {Opt_compress_type, "compress=%s"}, 352 {Opt_compress_force, "compress-force"}, 353 {Opt_compress_force_type, "compress-force=%s"}, 354 {Opt_ssd, "ssd"}, 355 {Opt_ssd_spread, "ssd_spread"}, 356 {Opt_nossd, "nossd"}, 357 {Opt_acl, "acl"}, 358 {Opt_noacl, "noacl"}, 359 {Opt_notreelog, "notreelog"}, 360 {Opt_treelog, "treelog"}, 361 {Opt_flushoncommit, "flushoncommit"}, 362 {Opt_noflushoncommit, "noflushoncommit"}, 363 {Opt_ratio, "metadata_ratio=%d"}, 364 {Opt_discard, "discard"}, 365 {Opt_nodiscard, "nodiscard"}, 366 {Opt_space_cache, "space_cache"}, 367 {Opt_clear_cache, "clear_cache"}, 368 {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, 369 {Opt_enospc_debug, "enospc_debug"}, 370 {Opt_noenospc_debug, "noenospc_debug"}, 371 {Opt_subvolrootid, "subvolrootid=%d"}, 372 {Opt_defrag, "autodefrag"}, 373 {Opt_nodefrag, "noautodefrag"}, 374 {Opt_inode_cache, "inode_cache"}, 375 {Opt_noinode_cache, "noinode_cache"}, 376 {Opt_no_space_cache, "nospace_cache"}, 377 {Opt_recovery, "recovery"}, 378 {Opt_skip_balance, "skip_balance"}, 379 {Opt_check_integrity, "check_int"}, 380 {Opt_check_integrity_including_extent_data, "check_int_data"}, 381 {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, 382 {Opt_rescan_uuid_tree, "rescan_uuid_tree"}, 383 {Opt_fatal_errors, "fatal_errors=%s"}, 384 {Opt_commit_interval, "commit=%d"}, 385 {Opt_err, NULL}, 386 }; 387 388 /* 389 * Regular mount options parser. Everything that is needed only when 390 * reading in a new superblock is parsed here. 391 * XXX JDM: This needs to be cleaned up for remount. 392 */ 393 int btrfs_parse_options(struct btrfs_root *root, char *options) 394 { 395 struct btrfs_fs_info *info = root->fs_info; 396 substring_t args[MAX_OPT_ARGS]; 397 char *p, *num, *orig = NULL; 398 u64 cache_gen; 399 int intarg; 400 int ret = 0; 401 char *compress_type; 402 bool compress_force = false; 403 bool compress = false; 404 405 cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); 406 if (cache_gen) 407 btrfs_set_opt(info->mount_opt, SPACE_CACHE); 408 409 if (!options) 410 goto out; 411 412 /* 413 * strsep changes the string, duplicate it because parse_options 414 * gets called twice 415 */ 416 options = kstrdup(options, GFP_NOFS); 417 if (!options) 418 return -ENOMEM; 419 420 orig = options; 421 422 while ((p = strsep(&options, ",")) != NULL) { 423 int token; 424 if (!*p) 425 continue; 426 427 token = match_token(p, tokens, args); 428 switch (token) { 429 case Opt_degraded: 430 btrfs_info(root->fs_info, "allowing degraded mounts"); 431 btrfs_set_opt(info->mount_opt, DEGRADED); 432 break; 433 case Opt_subvol: 434 case Opt_subvolid: 435 case Opt_subvolrootid: 436 case Opt_device: 437 /* 438 * These are parsed by btrfs_parse_early_options 439 * and can be happily ignored here. 440 */ 441 break; 442 case Opt_nodatasum: 443 btrfs_set_and_info(root, NODATASUM, 444 "setting nodatasum"); 445 break; 446 case Opt_datasum: 447 if (btrfs_test_opt(root, NODATASUM)) { 448 if (btrfs_test_opt(root, NODATACOW)) 449 btrfs_info(root->fs_info, "setting datasum, datacow enabled"); 450 else 451 btrfs_info(root->fs_info, "setting datasum"); 452 } 453 btrfs_clear_opt(info->mount_opt, NODATACOW); 454 btrfs_clear_opt(info->mount_opt, NODATASUM); 455 break; 456 case Opt_nodatacow: 457 if (!btrfs_test_opt(root, NODATACOW)) { 458 if (!btrfs_test_opt(root, COMPRESS) || 459 !btrfs_test_opt(root, FORCE_COMPRESS)) { 460 btrfs_info(root->fs_info, 461 "setting nodatacow, compression disabled"); 462 } else { 463 btrfs_info(root->fs_info, "setting nodatacow"); 464 } 465 } 466 btrfs_clear_opt(info->mount_opt, COMPRESS); 467 btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 468 btrfs_set_opt(info->mount_opt, NODATACOW); 469 btrfs_set_opt(info->mount_opt, NODATASUM); 470 break; 471 case Opt_datacow: 472 btrfs_clear_and_info(root, NODATACOW, 473 "setting datacow"); 474 break; 475 case Opt_compress_force: 476 case Opt_compress_force_type: 477 compress_force = true; 478 /* Fallthrough */ 479 case Opt_compress: 480 case Opt_compress_type: 481 compress = true; 482 if (token == Opt_compress || 483 token == Opt_compress_force || 484 strcmp(args[0].from, "zlib") == 0) { 485 compress_type = "zlib"; 486 info->compress_type = BTRFS_COMPRESS_ZLIB; 487 btrfs_set_opt(info->mount_opt, COMPRESS); 488 btrfs_clear_opt(info->mount_opt, NODATACOW); 489 btrfs_clear_opt(info->mount_opt, NODATASUM); 490 } else if (strcmp(args[0].from, "lzo") == 0) { 491 compress_type = "lzo"; 492 info->compress_type = BTRFS_COMPRESS_LZO; 493 btrfs_set_opt(info->mount_opt, COMPRESS); 494 btrfs_clear_opt(info->mount_opt, NODATACOW); 495 btrfs_clear_opt(info->mount_opt, NODATASUM); 496 btrfs_set_fs_incompat(info, COMPRESS_LZO); 497 } else if (strncmp(args[0].from, "no", 2) == 0) { 498 compress_type = "no"; 499 btrfs_clear_opt(info->mount_opt, COMPRESS); 500 btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 501 compress_force = false; 502 } else { 503 ret = -EINVAL; 504 goto out; 505 } 506 507 if (compress_force) { 508 btrfs_set_and_info(root, FORCE_COMPRESS, 509 "force %s compression", 510 compress_type); 511 } else if (compress) { 512 if (!btrfs_test_opt(root, COMPRESS)) 513 btrfs_info(root->fs_info, 514 "btrfs: use %s compression\n", 515 compress_type); 516 } 517 break; 518 case Opt_ssd: 519 btrfs_set_and_info(root, SSD, 520 "use ssd allocation scheme"); 521 break; 522 case Opt_ssd_spread: 523 btrfs_set_and_info(root, SSD_SPREAD, 524 "use spread ssd allocation scheme"); 525 break; 526 case Opt_nossd: 527 btrfs_clear_and_info(root, NOSSD, 528 "not using ssd allocation scheme"); 529 btrfs_clear_opt(info->mount_opt, SSD); 530 break; 531 case Opt_barrier: 532 btrfs_clear_and_info(root, NOBARRIER, 533 "turning on barriers"); 534 break; 535 case Opt_nobarrier: 536 btrfs_set_and_info(root, NOBARRIER, 537 "turning off barriers"); 538 break; 539 case Opt_thread_pool: 540 ret = match_int(&args[0], &intarg); 541 if (ret) { 542 goto out; 543 } else if (intarg > 0) { 544 info->thread_pool_size = intarg; 545 } else { 546 ret = -EINVAL; 547 goto out; 548 } 549 break; 550 case Opt_max_inline: 551 num = match_strdup(&args[0]); 552 if (num) { 553 info->max_inline = memparse(num, NULL); 554 kfree(num); 555 556 if (info->max_inline) { 557 info->max_inline = min_t(u64, 558 info->max_inline, 559 root->sectorsize); 560 } 561 btrfs_info(root->fs_info, "max_inline at %llu", 562 info->max_inline); 563 } else { 564 ret = -ENOMEM; 565 goto out; 566 } 567 break; 568 case Opt_alloc_start: 569 num = match_strdup(&args[0]); 570 if (num) { 571 mutex_lock(&info->chunk_mutex); 572 info->alloc_start = memparse(num, NULL); 573 mutex_unlock(&info->chunk_mutex); 574 kfree(num); 575 btrfs_info(root->fs_info, "allocations start at %llu", 576 info->alloc_start); 577 } else { 578 ret = -ENOMEM; 579 goto out; 580 } 581 break; 582 case Opt_acl: 583 root->fs_info->sb->s_flags |= MS_POSIXACL; 584 break; 585 case Opt_noacl: 586 root->fs_info->sb->s_flags &= ~MS_POSIXACL; 587 break; 588 case Opt_notreelog: 589 btrfs_set_and_info(root, NOTREELOG, 590 "disabling tree log"); 591 break; 592 case Opt_treelog: 593 btrfs_clear_and_info(root, NOTREELOG, 594 "enabling tree log"); 595 break; 596 case Opt_flushoncommit: 597 btrfs_set_and_info(root, FLUSHONCOMMIT, 598 "turning on flush-on-commit"); 599 break; 600 case Opt_noflushoncommit: 601 btrfs_clear_and_info(root, FLUSHONCOMMIT, 602 "turning off flush-on-commit"); 603 break; 604 case Opt_ratio: 605 ret = match_int(&args[0], &intarg); 606 if (ret) { 607 goto out; 608 } else if (intarg >= 0) { 609 info->metadata_ratio = intarg; 610 btrfs_info(root->fs_info, "metadata ratio %d", 611 info->metadata_ratio); 612 } else { 613 ret = -EINVAL; 614 goto out; 615 } 616 break; 617 case Opt_discard: 618 btrfs_set_and_info(root, DISCARD, 619 "turning on discard"); 620 break; 621 case Opt_nodiscard: 622 btrfs_clear_and_info(root, DISCARD, 623 "turning off discard"); 624 break; 625 case Opt_space_cache: 626 btrfs_set_and_info(root, SPACE_CACHE, 627 "enabling disk space caching"); 628 break; 629 case Opt_rescan_uuid_tree: 630 btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); 631 break; 632 case Opt_no_space_cache: 633 btrfs_clear_and_info(root, SPACE_CACHE, 634 "disabling disk space caching"); 635 break; 636 case Opt_inode_cache: 637 btrfs_set_and_info(root, CHANGE_INODE_CACHE, 638 "enabling inode map caching"); 639 break; 640 case Opt_noinode_cache: 641 btrfs_clear_and_info(root, CHANGE_INODE_CACHE, 642 "disabling inode map caching"); 643 break; 644 case Opt_clear_cache: 645 btrfs_set_and_info(root, CLEAR_CACHE, 646 "force clearing of disk cache"); 647 break; 648 case Opt_user_subvol_rm_allowed: 649 btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); 650 break; 651 case Opt_enospc_debug: 652 btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); 653 break; 654 case Opt_noenospc_debug: 655 btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG); 656 break; 657 case Opt_defrag: 658 btrfs_set_and_info(root, AUTO_DEFRAG, 659 "enabling auto defrag"); 660 break; 661 case Opt_nodefrag: 662 btrfs_clear_and_info(root, AUTO_DEFRAG, 663 "disabling auto defrag"); 664 break; 665 case Opt_recovery: 666 btrfs_info(root->fs_info, "enabling auto recovery"); 667 btrfs_set_opt(info->mount_opt, RECOVERY); 668 break; 669 case Opt_skip_balance: 670 btrfs_set_opt(info->mount_opt, SKIP_BALANCE); 671 break; 672 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 673 case Opt_check_integrity_including_extent_data: 674 btrfs_info(root->fs_info, 675 "enabling check integrity including extent data"); 676 btrfs_set_opt(info->mount_opt, 677 CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); 678 btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 679 break; 680 case Opt_check_integrity: 681 btrfs_info(root->fs_info, "enabling check integrity"); 682 btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 683 break; 684 case Opt_check_integrity_print_mask: 685 ret = match_int(&args[0], &intarg); 686 if (ret) { 687 goto out; 688 } else if (intarg >= 0) { 689 info->check_integrity_print_mask = intarg; 690 btrfs_info(root->fs_info, "check_integrity_print_mask 0x%x", 691 info->check_integrity_print_mask); 692 } else { 693 ret = -EINVAL; 694 goto out; 695 } 696 break; 697 #else 698 case Opt_check_integrity_including_extent_data: 699 case Opt_check_integrity: 700 case Opt_check_integrity_print_mask: 701 btrfs_err(root->fs_info, 702 "support for check_integrity* not compiled in!"); 703 ret = -EINVAL; 704 goto out; 705 #endif 706 case Opt_fatal_errors: 707 if (strcmp(args[0].from, "panic") == 0) 708 btrfs_set_opt(info->mount_opt, 709 PANIC_ON_FATAL_ERROR); 710 else if (strcmp(args[0].from, "bug") == 0) 711 btrfs_clear_opt(info->mount_opt, 712 PANIC_ON_FATAL_ERROR); 713 else { 714 ret = -EINVAL; 715 goto out; 716 } 717 break; 718 case Opt_commit_interval: 719 intarg = 0; 720 ret = match_int(&args[0], &intarg); 721 if (ret < 0) { 722 btrfs_err(root->fs_info, "invalid commit interval"); 723 ret = -EINVAL; 724 goto out; 725 } 726 if (intarg > 0) { 727 if (intarg > 300) { 728 btrfs_warn(root->fs_info, "excessive commit interval %d", 729 intarg); 730 } 731 info->commit_interval = intarg; 732 } else { 733 btrfs_info(root->fs_info, "using default commit interval %ds", 734 BTRFS_DEFAULT_COMMIT_INTERVAL); 735 info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; 736 } 737 break; 738 case Opt_err: 739 btrfs_info(root->fs_info, "unrecognized mount option '%s'", p); 740 ret = -EINVAL; 741 goto out; 742 default: 743 break; 744 } 745 } 746 out: 747 if (!ret && btrfs_test_opt(root, SPACE_CACHE)) 748 btrfs_info(root->fs_info, "disk space caching is enabled"); 749 kfree(orig); 750 return ret; 751 } 752 753 /* 754 * Parse mount options that are required early in the mount process. 755 * 756 * All other options will be parsed on much later in the mount process and 757 * only when we need to allocate a new super block. 758 */ 759 static int btrfs_parse_early_options(const char *options, fmode_t flags, 760 void *holder, char **subvol_name, u64 *subvol_objectid, 761 struct btrfs_fs_devices **fs_devices) 762 { 763 substring_t args[MAX_OPT_ARGS]; 764 char *device_name, *opts, *orig, *p; 765 char *num = NULL; 766 int error = 0; 767 768 if (!options) 769 return 0; 770 771 /* 772 * strsep changes the string, duplicate it because parse_options 773 * gets called twice 774 */ 775 opts = kstrdup(options, GFP_KERNEL); 776 if (!opts) 777 return -ENOMEM; 778 orig = opts; 779 780 while ((p = strsep(&opts, ",")) != NULL) { 781 int token; 782 if (!*p) 783 continue; 784 785 token = match_token(p, tokens, args); 786 switch (token) { 787 case Opt_subvol: 788 kfree(*subvol_name); 789 *subvol_name = match_strdup(&args[0]); 790 if (!*subvol_name) { 791 error = -ENOMEM; 792 goto out; 793 } 794 break; 795 case Opt_subvolid: 796 num = match_strdup(&args[0]); 797 if (num) { 798 *subvol_objectid = memparse(num, NULL); 799 kfree(num); 800 /* we want the original fs_tree */ 801 if (!*subvol_objectid) 802 *subvol_objectid = 803 BTRFS_FS_TREE_OBJECTID; 804 } else { 805 error = -EINVAL; 806 goto out; 807 } 808 break; 809 case Opt_subvolrootid: 810 printk(KERN_WARNING 811 "BTRFS: 'subvolrootid' mount option is deprecated and has " 812 "no effect\n"); 813 break; 814 case Opt_device: 815 device_name = match_strdup(&args[0]); 816 if (!device_name) { 817 error = -ENOMEM; 818 goto out; 819 } 820 error = btrfs_scan_one_device(device_name, 821 flags, holder, fs_devices); 822 kfree(device_name); 823 if (error) 824 goto out; 825 break; 826 default: 827 break; 828 } 829 } 830 831 out: 832 kfree(orig); 833 return error; 834 } 835 836 static struct dentry *get_default_root(struct super_block *sb, 837 u64 subvol_objectid) 838 { 839 struct btrfs_fs_info *fs_info = btrfs_sb(sb); 840 struct btrfs_root *root = fs_info->tree_root; 841 struct btrfs_root *new_root; 842 struct btrfs_dir_item *di; 843 struct btrfs_path *path; 844 struct btrfs_key location; 845 struct inode *inode; 846 struct dentry *dentry; 847 u64 dir_id; 848 int new = 0; 849 850 /* 851 * We have a specific subvol we want to mount, just setup location and 852 * go look up the root. 853 */ 854 if (subvol_objectid) { 855 location.objectid = subvol_objectid; 856 location.type = BTRFS_ROOT_ITEM_KEY; 857 location.offset = (u64)-1; 858 goto find_root; 859 } 860 861 path = btrfs_alloc_path(); 862 if (!path) 863 return ERR_PTR(-ENOMEM); 864 path->leave_spinning = 1; 865 866 /* 867 * Find the "default" dir item which points to the root item that we 868 * will mount by default if we haven't been given a specific subvolume 869 * to mount. 870 */ 871 dir_id = btrfs_super_root_dir(fs_info->super_copy); 872 di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); 873 if (IS_ERR(di)) { 874 btrfs_free_path(path); 875 return ERR_CAST(di); 876 } 877 if (!di) { 878 /* 879 * Ok the default dir item isn't there. This is weird since 880 * it's always been there, but don't freak out, just try and 881 * mount to root most subvolume. 882 */ 883 btrfs_free_path(path); 884 dir_id = BTRFS_FIRST_FREE_OBJECTID; 885 new_root = fs_info->fs_root; 886 goto setup_root; 887 } 888 889 btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); 890 btrfs_free_path(path); 891 892 find_root: 893 new_root = btrfs_read_fs_root_no_name(fs_info, &location); 894 if (IS_ERR(new_root)) 895 return ERR_CAST(new_root); 896 897 dir_id = btrfs_root_dirid(&new_root->root_item); 898 setup_root: 899 location.objectid = dir_id; 900 location.type = BTRFS_INODE_ITEM_KEY; 901 location.offset = 0; 902 903 inode = btrfs_iget(sb, &location, new_root, &new); 904 if (IS_ERR(inode)) 905 return ERR_CAST(inode); 906 907 /* 908 * If we're just mounting the root most subvol put the inode and return 909 * a reference to the dentry. We will have already gotten a reference 910 * to the inode in btrfs_fill_super so we're good to go. 911 */ 912 if (!new && sb->s_root->d_inode == inode) { 913 iput(inode); 914 return dget(sb->s_root); 915 } 916 917 dentry = d_obtain_alias(inode); 918 if (!IS_ERR(dentry)) { 919 spin_lock(&dentry->d_lock); 920 dentry->d_flags &= ~DCACHE_DISCONNECTED; 921 spin_unlock(&dentry->d_lock); 922 } 923 return dentry; 924 } 925 926 static int btrfs_fill_super(struct super_block *sb, 927 struct btrfs_fs_devices *fs_devices, 928 void *data, int silent) 929 { 930 struct inode *inode; 931 struct btrfs_fs_info *fs_info = btrfs_sb(sb); 932 struct btrfs_key key; 933 int err; 934 935 sb->s_maxbytes = MAX_LFS_FILESIZE; 936 sb->s_magic = BTRFS_SUPER_MAGIC; 937 sb->s_op = &btrfs_super_ops; 938 sb->s_d_op = &btrfs_dentry_operations; 939 sb->s_export_op = &btrfs_export_ops; 940 sb->s_xattr = btrfs_xattr_handlers; 941 sb->s_time_gran = 1; 942 #ifdef CONFIG_BTRFS_FS_POSIX_ACL 943 sb->s_flags |= MS_POSIXACL; 944 #endif 945 sb->s_flags |= MS_I_VERSION; 946 err = open_ctree(sb, fs_devices, (char *)data); 947 if (err) { 948 printk(KERN_ERR "BTRFS: open_ctree failed\n"); 949 return err; 950 } 951 952 key.objectid = BTRFS_FIRST_FREE_OBJECTID; 953 key.type = BTRFS_INODE_ITEM_KEY; 954 key.offset = 0; 955 inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); 956 if (IS_ERR(inode)) { 957 err = PTR_ERR(inode); 958 goto fail_close; 959 } 960 961 sb->s_root = d_make_root(inode); 962 if (!sb->s_root) { 963 err = -ENOMEM; 964 goto fail_close; 965 } 966 967 save_mount_options(sb, data); 968 cleancache_init_fs(sb); 969 sb->s_flags |= MS_ACTIVE; 970 return 0; 971 972 fail_close: 973 close_ctree(fs_info->tree_root); 974 return err; 975 } 976 977 int btrfs_sync_fs(struct super_block *sb, int wait) 978 { 979 struct btrfs_trans_handle *trans; 980 struct btrfs_fs_info *fs_info = btrfs_sb(sb); 981 struct btrfs_root *root = fs_info->tree_root; 982 983 trace_btrfs_sync_fs(wait); 984 985 if (!wait) { 986 filemap_flush(fs_info->btree_inode->i_mapping); 987 return 0; 988 } 989 990 btrfs_wait_ordered_roots(fs_info, -1); 991 992 trans = btrfs_attach_transaction_barrier(root); 993 if (IS_ERR(trans)) { 994 /* no transaction, don't bother */ 995 if (PTR_ERR(trans) == -ENOENT) 996 return 0; 997 return PTR_ERR(trans); 998 } 999 return btrfs_commit_transaction(trans, root); 1000 } 1001 1002 static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) 1003 { 1004 struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); 1005 struct btrfs_root *root = info->tree_root; 1006 char *compress_type; 1007 1008 if (btrfs_test_opt(root, DEGRADED)) 1009 seq_puts(seq, ",degraded"); 1010 if (btrfs_test_opt(root, NODATASUM)) 1011 seq_puts(seq, ",nodatasum"); 1012 if (btrfs_test_opt(root, NODATACOW)) 1013 seq_puts(seq, ",nodatacow"); 1014 if (btrfs_test_opt(root, NOBARRIER)) 1015 seq_puts(seq, ",nobarrier"); 1016 if (info->max_inline != 8192 * 1024) 1017 seq_printf(seq, ",max_inline=%llu", info->max_inline); 1018 if (info->alloc_start != 0) 1019 seq_printf(seq, ",alloc_start=%llu", info->alloc_start); 1020 if (info->thread_pool_size != min_t(unsigned long, 1021 num_online_cpus() + 2, 8)) 1022 seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); 1023 if (btrfs_test_opt(root, COMPRESS)) { 1024 if (info->compress_type == BTRFS_COMPRESS_ZLIB) 1025 compress_type = "zlib"; 1026 else 1027 compress_type = "lzo"; 1028 if (btrfs_test_opt(root, FORCE_COMPRESS)) 1029 seq_printf(seq, ",compress-force=%s", compress_type); 1030 else 1031 seq_printf(seq, ",compress=%s", compress_type); 1032 } 1033 if (btrfs_test_opt(root, NOSSD)) 1034 seq_puts(seq, ",nossd"); 1035 if (btrfs_test_opt(root, SSD_SPREAD)) 1036 seq_puts(seq, ",ssd_spread"); 1037 else if (btrfs_test_opt(root, SSD)) 1038 seq_puts(seq, ",ssd"); 1039 if (btrfs_test_opt(root, NOTREELOG)) 1040 seq_puts(seq, ",notreelog"); 1041 if (btrfs_test_opt(root, FLUSHONCOMMIT)) 1042 seq_puts(seq, ",flushoncommit"); 1043 if (btrfs_test_opt(root, DISCARD)) 1044 seq_puts(seq, ",discard"); 1045 if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) 1046 seq_puts(seq, ",noacl"); 1047 if (btrfs_test_opt(root, SPACE_CACHE)) 1048 seq_puts(seq, ",space_cache"); 1049 else 1050 seq_puts(seq, ",nospace_cache"); 1051 if (btrfs_test_opt(root, RESCAN_UUID_TREE)) 1052 seq_puts(seq, ",rescan_uuid_tree"); 1053 if (btrfs_test_opt(root, CLEAR_CACHE)) 1054 seq_puts(seq, ",clear_cache"); 1055 if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 1056 seq_puts(seq, ",user_subvol_rm_allowed"); 1057 if (btrfs_test_opt(root, ENOSPC_DEBUG)) 1058 seq_puts(seq, ",enospc_debug"); 1059 if (btrfs_test_opt(root, AUTO_DEFRAG)) 1060 seq_puts(seq, ",autodefrag"); 1061 if (btrfs_test_opt(root, INODE_MAP_CACHE)) 1062 seq_puts(seq, ",inode_cache"); 1063 if (btrfs_test_opt(root, SKIP_BALANCE)) 1064 seq_puts(seq, ",skip_balance"); 1065 if (btrfs_test_opt(root, RECOVERY)) 1066 seq_puts(seq, ",recovery"); 1067 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 1068 if (btrfs_test_opt(root, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA)) 1069 seq_puts(seq, ",check_int_data"); 1070 else if (btrfs_test_opt(root, CHECK_INTEGRITY)) 1071 seq_puts(seq, ",check_int"); 1072 if (info->check_integrity_print_mask) 1073 seq_printf(seq, ",check_int_print_mask=%d", 1074 info->check_integrity_print_mask); 1075 #endif 1076 if (info->metadata_ratio) 1077 seq_printf(seq, ",metadata_ratio=%d", 1078 info->metadata_ratio); 1079 if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR)) 1080 seq_puts(seq, ",fatal_errors=panic"); 1081 if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) 1082 seq_printf(seq, ",commit=%d", info->commit_interval); 1083 return 0; 1084 } 1085 1086 static int btrfs_test_super(struct super_block *s, void *data) 1087 { 1088 struct btrfs_fs_info *p = data; 1089 struct btrfs_fs_info *fs_info = btrfs_sb(s); 1090 1091 return fs_info->fs_devices == p->fs_devices; 1092 } 1093 1094 static int btrfs_set_super(struct super_block *s, void *data) 1095 { 1096 int err = set_anon_super(s, data); 1097 if (!err) 1098 s->s_fs_info = data; 1099 return err; 1100 } 1101 1102 /* 1103 * subvolumes are identified by ino 256 1104 */ 1105 static inline int is_subvolume_inode(struct inode *inode) 1106 { 1107 if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) 1108 return 1; 1109 return 0; 1110 } 1111 1112 /* 1113 * This will strip out the subvol=%s argument for an argument string and add 1114 * subvolid=0 to make sure we get the actual tree root for path walking to the 1115 * subvol we want. 1116 */ 1117 static char *setup_root_args(char *args) 1118 { 1119 unsigned len = strlen(args) + 2 + 1; 1120 char *src, *dst, *buf; 1121 1122 /* 1123 * We need the same args as before, but with this substitution: 1124 * s!subvol=[^,]+!subvolid=0! 1125 * 1126 * Since the replacement string is up to 2 bytes longer than the 1127 * original, allocate strlen(args) + 2 + 1 bytes. 1128 */ 1129 1130 src = strstr(args, "subvol="); 1131 /* This shouldn't happen, but just in case.. */ 1132 if (!src) 1133 return NULL; 1134 1135 buf = dst = kmalloc(len, GFP_NOFS); 1136 if (!buf) 1137 return NULL; 1138 1139 /* 1140 * If the subvol= arg is not at the start of the string, 1141 * copy whatever precedes it into buf. 1142 */ 1143 if (src != args) { 1144 *src++ = '\0'; 1145 strcpy(buf, args); 1146 dst += strlen(args); 1147 } 1148 1149 strcpy(dst, "subvolid=0"); 1150 dst += strlen("subvolid=0"); 1151 1152 /* 1153 * If there is a "," after the original subvol=... string, 1154 * copy that suffix into our buffer. Otherwise, we're done. 1155 */ 1156 src = strchr(src, ','); 1157 if (src) 1158 strcpy(dst, src); 1159 1160 return buf; 1161 } 1162 1163 static struct dentry *mount_subvol(const char *subvol_name, int flags, 1164 const char *device_name, char *data) 1165 { 1166 struct dentry *root; 1167 struct vfsmount *mnt; 1168 char *newargs; 1169 1170 newargs = setup_root_args(data); 1171 if (!newargs) 1172 return ERR_PTR(-ENOMEM); 1173 mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, 1174 newargs); 1175 1176 if (PTR_RET(mnt) == -EBUSY) { 1177 if (flags & MS_RDONLY) { 1178 mnt = vfs_kern_mount(&btrfs_fs_type, flags & ~MS_RDONLY, device_name, 1179 newargs); 1180 } else { 1181 int r; 1182 mnt = vfs_kern_mount(&btrfs_fs_type, flags | MS_RDONLY, device_name, 1183 newargs); 1184 if (IS_ERR(mnt)) { 1185 kfree(newargs); 1186 return ERR_CAST(mnt); 1187 } 1188 1189 r = btrfs_remount(mnt->mnt_sb, &flags, NULL); 1190 if (r < 0) { 1191 /* FIXME: release vfsmount mnt ??*/ 1192 kfree(newargs); 1193 return ERR_PTR(r); 1194 } 1195 } 1196 } 1197 1198 kfree(newargs); 1199 1200 if (IS_ERR(mnt)) 1201 return ERR_CAST(mnt); 1202 1203 root = mount_subtree(mnt, subvol_name); 1204 1205 if (!IS_ERR(root) && !is_subvolume_inode(root->d_inode)) { 1206 struct super_block *s = root->d_sb; 1207 dput(root); 1208 root = ERR_PTR(-EINVAL); 1209 deactivate_locked_super(s); 1210 printk(KERN_ERR "BTRFS: '%s' is not a valid subvolume\n", 1211 subvol_name); 1212 } 1213 1214 return root; 1215 } 1216 1217 /* 1218 * Find a superblock for the given device / mount point. 1219 * 1220 * Note: This is based on get_sb_bdev from fs/super.c with a few additions 1221 * for multiple device setup. Make sure to keep it in sync. 1222 */ 1223 static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, 1224 const char *device_name, void *data) 1225 { 1226 struct block_device *bdev = NULL; 1227 struct super_block *s; 1228 struct dentry *root; 1229 struct btrfs_fs_devices *fs_devices = NULL; 1230 struct btrfs_fs_info *fs_info = NULL; 1231 fmode_t mode = FMODE_READ; 1232 char *subvol_name = NULL; 1233 u64 subvol_objectid = 0; 1234 int error = 0; 1235 1236 if (!(flags & MS_RDONLY)) 1237 mode |= FMODE_WRITE; 1238 1239 error = btrfs_parse_early_options(data, mode, fs_type, 1240 &subvol_name, &subvol_objectid, 1241 &fs_devices); 1242 if (error) { 1243 kfree(subvol_name); 1244 return ERR_PTR(error); 1245 } 1246 1247 if (subvol_name) { 1248 root = mount_subvol(subvol_name, flags, device_name, data); 1249 kfree(subvol_name); 1250 return root; 1251 } 1252 1253 error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); 1254 if (error) 1255 return ERR_PTR(error); 1256 1257 /* 1258 * Setup a dummy root and fs_info for test/set super. This is because 1259 * we don't actually fill this stuff out until open_ctree, but we need 1260 * it for searching for existing supers, so this lets us do that and 1261 * then open_ctree will properly initialize everything later. 1262 */ 1263 fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); 1264 if (!fs_info) 1265 return ERR_PTR(-ENOMEM); 1266 1267 fs_info->fs_devices = fs_devices; 1268 1269 fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); 1270 fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); 1271 if (!fs_info->super_copy || !fs_info->super_for_commit) { 1272 error = -ENOMEM; 1273 goto error_fs_info; 1274 } 1275 1276 error = btrfs_open_devices(fs_devices, mode, fs_type); 1277 if (error) 1278 goto error_fs_info; 1279 1280 if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { 1281 error = -EACCES; 1282 goto error_close_devices; 1283 } 1284 1285 bdev = fs_devices->latest_bdev; 1286 s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | MS_NOSEC, 1287 fs_info); 1288 if (IS_ERR(s)) { 1289 error = PTR_ERR(s); 1290 goto error_close_devices; 1291 } 1292 1293 if (s->s_root) { 1294 btrfs_close_devices(fs_devices); 1295 free_fs_info(fs_info); 1296 if ((flags ^ s->s_flags) & MS_RDONLY) 1297 error = -EBUSY; 1298 } else { 1299 char b[BDEVNAME_SIZE]; 1300 1301 strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); 1302 btrfs_sb(s)->bdev_holder = fs_type; 1303 error = btrfs_fill_super(s, fs_devices, data, 1304 flags & MS_SILENT ? 1 : 0); 1305 } 1306 1307 root = !error ? get_default_root(s, subvol_objectid) : ERR_PTR(error); 1308 if (IS_ERR(root)) 1309 deactivate_locked_super(s); 1310 1311 return root; 1312 1313 error_close_devices: 1314 btrfs_close_devices(fs_devices); 1315 error_fs_info: 1316 free_fs_info(fs_info); 1317 return ERR_PTR(error); 1318 } 1319 1320 static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, 1321 int new_pool_size, int old_pool_size) 1322 { 1323 if (new_pool_size == old_pool_size) 1324 return; 1325 1326 fs_info->thread_pool_size = new_pool_size; 1327 1328 btrfs_info(fs_info, "resize thread pool %d -> %d", 1329 old_pool_size, new_pool_size); 1330 1331 btrfs_workqueue_set_max(fs_info->workers, new_pool_size); 1332 btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size); 1333 btrfs_workqueue_set_max(fs_info->submit_workers, new_pool_size); 1334 btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size); 1335 btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size); 1336 btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size); 1337 btrfs_workqueue_set_max(fs_info->endio_meta_write_workers, 1338 new_pool_size); 1339 btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size); 1340 btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size); 1341 btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size); 1342 btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size); 1343 btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, 1344 new_pool_size); 1345 } 1346 1347 static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info) 1348 { 1349 set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 1350 } 1351 1352 static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, 1353 unsigned long old_opts, int flags) 1354 { 1355 if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1356 (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || 1357 (flags & MS_RDONLY))) { 1358 /* wait for any defraggers to finish */ 1359 wait_event(fs_info->transaction_wait, 1360 (atomic_read(&fs_info->defrag_running) == 0)); 1361 if (flags & MS_RDONLY) 1362 sync_filesystem(fs_info->sb); 1363 } 1364 } 1365 1366 static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, 1367 unsigned long old_opts) 1368 { 1369 /* 1370 * We need cleanup all defragable inodes if the autodefragment is 1371 * close or the fs is R/O. 1372 */ 1373 if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1374 (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || 1375 (fs_info->sb->s_flags & MS_RDONLY))) { 1376 btrfs_cleanup_defrag_inodes(fs_info); 1377 } 1378 1379 clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 1380 } 1381 1382 static int btrfs_remount(struct super_block *sb, int *flags, char *data) 1383 { 1384 struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1385 struct btrfs_root *root = fs_info->tree_root; 1386 unsigned old_flags = sb->s_flags; 1387 unsigned long old_opts = fs_info->mount_opt; 1388 unsigned long old_compress_type = fs_info->compress_type; 1389 u64 old_max_inline = fs_info->max_inline; 1390 u64 old_alloc_start = fs_info->alloc_start; 1391 int old_thread_pool_size = fs_info->thread_pool_size; 1392 unsigned int old_metadata_ratio = fs_info->metadata_ratio; 1393 int ret; 1394 1395 sync_filesystem(sb); 1396 btrfs_remount_prepare(fs_info); 1397 1398 ret = btrfs_parse_options(root, data); 1399 if (ret) { 1400 ret = -EINVAL; 1401 goto restore; 1402 } 1403 1404 btrfs_remount_begin(fs_info, old_opts, *flags); 1405 btrfs_resize_thread_pool(fs_info, 1406 fs_info->thread_pool_size, old_thread_pool_size); 1407 1408 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 1409 goto out; 1410 1411 if (*flags & MS_RDONLY) { 1412 /* 1413 * this also happens on 'umount -rf' or on shutdown, when 1414 * the filesystem is busy. 1415 */ 1416 1417 /* wait for the uuid_scan task to finish */ 1418 down(&fs_info->uuid_tree_rescan_sem); 1419 /* avoid complains from lockdep et al. */ 1420 up(&fs_info->uuid_tree_rescan_sem); 1421 1422 sb->s_flags |= MS_RDONLY; 1423 1424 btrfs_dev_replace_suspend_for_unmount(fs_info); 1425 btrfs_scrub_cancel(fs_info); 1426 btrfs_pause_balance(fs_info); 1427 1428 ret = btrfs_commit_super(root); 1429 if (ret) 1430 goto restore; 1431 } else { 1432 if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) { 1433 btrfs_err(fs_info, 1434 "Remounting read-write after error is not allowed"); 1435 ret = -EINVAL; 1436 goto restore; 1437 } 1438 if (fs_info->fs_devices->rw_devices == 0) { 1439 ret = -EACCES; 1440 goto restore; 1441 } 1442 1443 if (fs_info->fs_devices->missing_devices > 1444 fs_info->num_tolerated_disk_barrier_failures && 1445 !(*flags & MS_RDONLY)) { 1446 btrfs_warn(fs_info, 1447 "too many missing devices, writeable remount is not allowed"); 1448 ret = -EACCES; 1449 goto restore; 1450 } 1451 1452 if (btrfs_super_log_root(fs_info->super_copy) != 0) { 1453 ret = -EINVAL; 1454 goto restore; 1455 } 1456 1457 ret = btrfs_cleanup_fs_roots(fs_info); 1458 if (ret) 1459 goto restore; 1460 1461 /* recover relocation */ 1462 ret = btrfs_recover_relocation(root); 1463 if (ret) 1464 goto restore; 1465 1466 ret = btrfs_resume_balance_async(fs_info); 1467 if (ret) 1468 goto restore; 1469 1470 ret = btrfs_resume_dev_replace_async(fs_info); 1471 if (ret) { 1472 btrfs_warn(fs_info, "failed to resume dev_replace"); 1473 goto restore; 1474 } 1475 1476 if (!fs_info->uuid_root) { 1477 btrfs_info(fs_info, "creating UUID tree"); 1478 ret = btrfs_create_uuid_tree(fs_info); 1479 if (ret) { 1480 btrfs_warn(fs_info, "failed to create the UUID tree %d", ret); 1481 goto restore; 1482 } 1483 } 1484 sb->s_flags &= ~MS_RDONLY; 1485 } 1486 out: 1487 wake_up_process(fs_info->transaction_kthread); 1488 btrfs_remount_cleanup(fs_info, old_opts); 1489 return 0; 1490 1491 restore: 1492 /* We've hit an error - don't reset MS_RDONLY */ 1493 if (sb->s_flags & MS_RDONLY) 1494 old_flags |= MS_RDONLY; 1495 sb->s_flags = old_flags; 1496 fs_info->mount_opt = old_opts; 1497 fs_info->compress_type = old_compress_type; 1498 fs_info->max_inline = old_max_inline; 1499 mutex_lock(&fs_info->chunk_mutex); 1500 fs_info->alloc_start = old_alloc_start; 1501 mutex_unlock(&fs_info->chunk_mutex); 1502 btrfs_resize_thread_pool(fs_info, 1503 old_thread_pool_size, fs_info->thread_pool_size); 1504 fs_info->metadata_ratio = old_metadata_ratio; 1505 btrfs_remount_cleanup(fs_info, old_opts); 1506 return ret; 1507 } 1508 1509 /* Used to sort the devices by max_avail(descending sort) */ 1510 static int btrfs_cmp_device_free_bytes(const void *dev_info1, 1511 const void *dev_info2) 1512 { 1513 if (((struct btrfs_device_info *)dev_info1)->max_avail > 1514 ((struct btrfs_device_info *)dev_info2)->max_avail) 1515 return -1; 1516 else if (((struct btrfs_device_info *)dev_info1)->max_avail < 1517 ((struct btrfs_device_info *)dev_info2)->max_avail) 1518 return 1; 1519 else 1520 return 0; 1521 } 1522 1523 /* 1524 * sort the devices by max_avail, in which max free extent size of each device 1525 * is stored.(Descending Sort) 1526 */ 1527 static inline void btrfs_descending_sort_devices( 1528 struct btrfs_device_info *devices, 1529 size_t nr_devices) 1530 { 1531 sort(devices, nr_devices, sizeof(struct btrfs_device_info), 1532 btrfs_cmp_device_free_bytes, NULL); 1533 } 1534 1535 /* 1536 * The helper to calc the free space on the devices that can be used to store 1537 * file data. 1538 */ 1539 static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) 1540 { 1541 struct btrfs_fs_info *fs_info = root->fs_info; 1542 struct btrfs_device_info *devices_info; 1543 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 1544 struct btrfs_device *device; 1545 u64 skip_space; 1546 u64 type; 1547 u64 avail_space; 1548 u64 used_space; 1549 u64 min_stripe_size; 1550 int min_stripes = 1, num_stripes = 1; 1551 int i = 0, nr_devices; 1552 int ret; 1553 1554 nr_devices = fs_info->fs_devices->open_devices; 1555 BUG_ON(!nr_devices); 1556 1557 devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), 1558 GFP_NOFS); 1559 if (!devices_info) 1560 return -ENOMEM; 1561 1562 /* calc min stripe number for data space alloction */ 1563 type = btrfs_get_alloc_profile(root, 1); 1564 if (type & BTRFS_BLOCK_GROUP_RAID0) { 1565 min_stripes = 2; 1566 num_stripes = nr_devices; 1567 } else if (type & BTRFS_BLOCK_GROUP_RAID1) { 1568 min_stripes = 2; 1569 num_stripes = 2; 1570 } else if (type & BTRFS_BLOCK_GROUP_RAID10) { 1571 min_stripes = 4; 1572 num_stripes = 4; 1573 } 1574 1575 if (type & BTRFS_BLOCK_GROUP_DUP) 1576 min_stripe_size = 2 * BTRFS_STRIPE_LEN; 1577 else 1578 min_stripe_size = BTRFS_STRIPE_LEN; 1579 1580 list_for_each_entry(device, &fs_devices->devices, dev_list) { 1581 if (!device->in_fs_metadata || !device->bdev || 1582 device->is_tgtdev_for_dev_replace) 1583 continue; 1584 1585 avail_space = device->total_bytes - device->bytes_used; 1586 1587 /* align with stripe_len */ 1588 do_div(avail_space, BTRFS_STRIPE_LEN); 1589 avail_space *= BTRFS_STRIPE_LEN; 1590 1591 /* 1592 * In order to avoid overwritting the superblock on the drive, 1593 * btrfs starts at an offset of at least 1MB when doing chunk 1594 * allocation. 1595 */ 1596 skip_space = 1024 * 1024; 1597 1598 /* user can set the offset in fs_info->alloc_start. */ 1599 if (fs_info->alloc_start + BTRFS_STRIPE_LEN <= 1600 device->total_bytes) 1601 skip_space = max(fs_info->alloc_start, skip_space); 1602 1603 /* 1604 * btrfs can not use the free space in [0, skip_space - 1], 1605 * we must subtract it from the total. In order to implement 1606 * it, we account the used space in this range first. 1607 */ 1608 ret = btrfs_account_dev_extents_size(device, 0, skip_space - 1, 1609 &used_space); 1610 if (ret) { 1611 kfree(devices_info); 1612 return ret; 1613 } 1614 1615 /* calc the free space in [0, skip_space - 1] */ 1616 skip_space -= used_space; 1617 1618 /* 1619 * we can use the free space in [0, skip_space - 1], subtract 1620 * it from the total. 1621 */ 1622 if (avail_space && avail_space >= skip_space) 1623 avail_space -= skip_space; 1624 else 1625 avail_space = 0; 1626 1627 if (avail_space < min_stripe_size) 1628 continue; 1629 1630 devices_info[i].dev = device; 1631 devices_info[i].max_avail = avail_space; 1632 1633 i++; 1634 } 1635 1636 nr_devices = i; 1637 1638 btrfs_descending_sort_devices(devices_info, nr_devices); 1639 1640 i = nr_devices - 1; 1641 avail_space = 0; 1642 while (nr_devices >= min_stripes) { 1643 if (num_stripes > nr_devices) 1644 num_stripes = nr_devices; 1645 1646 if (devices_info[i].max_avail >= min_stripe_size) { 1647 int j; 1648 u64 alloc_size; 1649 1650 avail_space += devices_info[i].max_avail * num_stripes; 1651 alloc_size = devices_info[i].max_avail; 1652 for (j = i + 1 - num_stripes; j <= i; j++) 1653 devices_info[j].max_avail -= alloc_size; 1654 } 1655 i--; 1656 nr_devices--; 1657 } 1658 1659 kfree(devices_info); 1660 *free_bytes = avail_space; 1661 return 0; 1662 } 1663 1664 static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) 1665 { 1666 struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); 1667 struct btrfs_super_block *disk_super = fs_info->super_copy; 1668 struct list_head *head = &fs_info->space_info; 1669 struct btrfs_space_info *found; 1670 u64 total_used = 0; 1671 u64 total_free_data = 0; 1672 int bits = dentry->d_sb->s_blocksize_bits; 1673 __be32 *fsid = (__be32 *)fs_info->fsid; 1674 int ret; 1675 1676 /* holding chunk_muext to avoid allocating new chunks */ 1677 mutex_lock(&fs_info->chunk_mutex); 1678 rcu_read_lock(); 1679 list_for_each_entry_rcu(found, head, list) { 1680 if (found->flags & BTRFS_BLOCK_GROUP_DATA) { 1681 total_free_data += found->disk_total - found->disk_used; 1682 total_free_data -= 1683 btrfs_account_ro_block_groups_free_space(found); 1684 } 1685 1686 total_used += found->disk_used; 1687 } 1688 rcu_read_unlock(); 1689 1690 buf->f_namelen = BTRFS_NAME_LEN; 1691 buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; 1692 buf->f_bfree = buf->f_blocks - (total_used >> bits); 1693 buf->f_bsize = dentry->d_sb->s_blocksize; 1694 buf->f_type = BTRFS_SUPER_MAGIC; 1695 buf->f_bavail = total_free_data; 1696 ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data); 1697 if (ret) { 1698 mutex_unlock(&fs_info->chunk_mutex); 1699 return ret; 1700 } 1701 buf->f_bavail += total_free_data; 1702 buf->f_bavail = buf->f_bavail >> bits; 1703 mutex_unlock(&fs_info->chunk_mutex); 1704 1705 /* We treat it as constant endianness (it doesn't matter _which_) 1706 because we want the fsid to come out the same whether mounted 1707 on a big-endian or little-endian host */ 1708 buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); 1709 buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); 1710 /* Mask in the root object ID too, to disambiguate subvols */ 1711 buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; 1712 buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; 1713 1714 return 0; 1715 } 1716 1717 static void btrfs_kill_super(struct super_block *sb) 1718 { 1719 struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1720 kill_anon_super(sb); 1721 free_fs_info(fs_info); 1722 } 1723 1724 static struct file_system_type btrfs_fs_type = { 1725 .owner = THIS_MODULE, 1726 .name = "btrfs", 1727 .mount = btrfs_mount, 1728 .kill_sb = btrfs_kill_super, 1729 .fs_flags = FS_REQUIRES_DEV, 1730 }; 1731 MODULE_ALIAS_FS("btrfs"); 1732 1733 /* 1734 * used by btrfsctl to scan devices when no FS is mounted 1735 */ 1736 static long btrfs_control_ioctl(struct file *file, unsigned int cmd, 1737 unsigned long arg) 1738 { 1739 struct btrfs_ioctl_vol_args *vol; 1740 struct btrfs_fs_devices *fs_devices; 1741 int ret = -ENOTTY; 1742 1743 if (!capable(CAP_SYS_ADMIN)) 1744 return -EPERM; 1745 1746 vol = memdup_user((void __user *)arg, sizeof(*vol)); 1747 if (IS_ERR(vol)) 1748 return PTR_ERR(vol); 1749 1750 switch (cmd) { 1751 case BTRFS_IOC_SCAN_DEV: 1752 ret = btrfs_scan_one_device(vol->name, FMODE_READ, 1753 &btrfs_fs_type, &fs_devices); 1754 break; 1755 case BTRFS_IOC_DEVICES_READY: 1756 ret = btrfs_scan_one_device(vol->name, FMODE_READ, 1757 &btrfs_fs_type, &fs_devices); 1758 if (ret) 1759 break; 1760 ret = !(fs_devices->num_devices == fs_devices->total_devices); 1761 break; 1762 } 1763 1764 kfree(vol); 1765 return ret; 1766 } 1767 1768 static int btrfs_freeze(struct super_block *sb) 1769 { 1770 struct btrfs_trans_handle *trans; 1771 struct btrfs_root *root = btrfs_sb(sb)->tree_root; 1772 1773 trans = btrfs_attach_transaction_barrier(root); 1774 if (IS_ERR(trans)) { 1775 /* no transaction, don't bother */ 1776 if (PTR_ERR(trans) == -ENOENT) 1777 return 0; 1778 return PTR_ERR(trans); 1779 } 1780 return btrfs_commit_transaction(trans, root); 1781 } 1782 1783 static int btrfs_unfreeze(struct super_block *sb) 1784 { 1785 return 0; 1786 } 1787 1788 static int btrfs_show_devname(struct seq_file *m, struct dentry *root) 1789 { 1790 struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); 1791 struct btrfs_fs_devices *cur_devices; 1792 struct btrfs_device *dev, *first_dev = NULL; 1793 struct list_head *head; 1794 struct rcu_string *name; 1795 1796 mutex_lock(&fs_info->fs_devices->device_list_mutex); 1797 cur_devices = fs_info->fs_devices; 1798 while (cur_devices) { 1799 head = &cur_devices->devices; 1800 list_for_each_entry(dev, head, dev_list) { 1801 if (dev->missing) 1802 continue; 1803 if (!first_dev || dev->devid < first_dev->devid) 1804 first_dev = dev; 1805 } 1806 cur_devices = cur_devices->seed; 1807 } 1808 1809 if (first_dev) { 1810 rcu_read_lock(); 1811 name = rcu_dereference(first_dev->name); 1812 seq_escape(m, name->str, " \t\n\\"); 1813 rcu_read_unlock(); 1814 } else { 1815 WARN_ON(1); 1816 } 1817 mutex_unlock(&fs_info->fs_devices->device_list_mutex); 1818 return 0; 1819 } 1820 1821 static const struct super_operations btrfs_super_ops = { 1822 .drop_inode = btrfs_drop_inode, 1823 .evict_inode = btrfs_evict_inode, 1824 .put_super = btrfs_put_super, 1825 .sync_fs = btrfs_sync_fs, 1826 .show_options = btrfs_show_options, 1827 .show_devname = btrfs_show_devname, 1828 .write_inode = btrfs_write_inode, 1829 .alloc_inode = btrfs_alloc_inode, 1830 .destroy_inode = btrfs_destroy_inode, 1831 .statfs = btrfs_statfs, 1832 .remount_fs = btrfs_remount, 1833 .freeze_fs = btrfs_freeze, 1834 .unfreeze_fs = btrfs_unfreeze, 1835 }; 1836 1837 static const struct file_operations btrfs_ctl_fops = { 1838 .unlocked_ioctl = btrfs_control_ioctl, 1839 .compat_ioctl = btrfs_control_ioctl, 1840 .owner = THIS_MODULE, 1841 .llseek = noop_llseek, 1842 }; 1843 1844 static struct miscdevice btrfs_misc = { 1845 .minor = BTRFS_MINOR, 1846 .name = "btrfs-control", 1847 .fops = &btrfs_ctl_fops 1848 }; 1849 1850 MODULE_ALIAS_MISCDEV(BTRFS_MINOR); 1851 MODULE_ALIAS("devname:btrfs-control"); 1852 1853 static int btrfs_interface_init(void) 1854 { 1855 return misc_register(&btrfs_misc); 1856 } 1857 1858 static void btrfs_interface_exit(void) 1859 { 1860 if (misc_deregister(&btrfs_misc) < 0) 1861 printk(KERN_INFO "BTRFS: misc_deregister failed for control device\n"); 1862 } 1863 1864 static void btrfs_print_info(void) 1865 { 1866 printk(KERN_INFO "Btrfs loaded" 1867 #ifdef CONFIG_BTRFS_DEBUG 1868 ", debug=on" 1869 #endif 1870 #ifdef CONFIG_BTRFS_ASSERT 1871 ", assert=on" 1872 #endif 1873 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 1874 ", integrity-checker=on" 1875 #endif 1876 "\n"); 1877 } 1878 1879 static int btrfs_run_sanity_tests(void) 1880 { 1881 int ret; 1882 1883 ret = btrfs_init_test_fs(); 1884 if (ret) 1885 return ret; 1886 1887 ret = btrfs_test_free_space_cache(); 1888 if (ret) 1889 goto out; 1890 ret = btrfs_test_extent_buffer_operations(); 1891 if (ret) 1892 goto out; 1893 ret = btrfs_test_extent_io(); 1894 if (ret) 1895 goto out; 1896 ret = btrfs_test_inodes(); 1897 out: 1898 btrfs_destroy_test_fs(); 1899 return ret; 1900 } 1901 1902 static int __init init_btrfs_fs(void) 1903 { 1904 int err; 1905 1906 err = btrfs_hash_init(); 1907 if (err) 1908 return err; 1909 1910 btrfs_props_init(); 1911 1912 err = btrfs_init_sysfs(); 1913 if (err) 1914 goto free_hash; 1915 1916 btrfs_init_compress(); 1917 1918 err = btrfs_init_cachep(); 1919 if (err) 1920 goto free_compress; 1921 1922 err = extent_io_init(); 1923 if (err) 1924 goto free_cachep; 1925 1926 err = extent_map_init(); 1927 if (err) 1928 goto free_extent_io; 1929 1930 err = ordered_data_init(); 1931 if (err) 1932 goto free_extent_map; 1933 1934 err = btrfs_delayed_inode_init(); 1935 if (err) 1936 goto free_ordered_data; 1937 1938 err = btrfs_auto_defrag_init(); 1939 if (err) 1940 goto free_delayed_inode; 1941 1942 err = btrfs_delayed_ref_init(); 1943 if (err) 1944 goto free_auto_defrag; 1945 1946 err = btrfs_prelim_ref_init(); 1947 if (err) 1948 goto free_prelim_ref; 1949 1950 err = btrfs_interface_init(); 1951 if (err) 1952 goto free_delayed_ref; 1953 1954 btrfs_init_lockdep(); 1955 1956 btrfs_print_info(); 1957 1958 err = btrfs_run_sanity_tests(); 1959 if (err) 1960 goto unregister_ioctl; 1961 1962 err = register_filesystem(&btrfs_fs_type); 1963 if (err) 1964 goto unregister_ioctl; 1965 1966 return 0; 1967 1968 unregister_ioctl: 1969 btrfs_interface_exit(); 1970 free_prelim_ref: 1971 btrfs_prelim_ref_exit(); 1972 free_delayed_ref: 1973 btrfs_delayed_ref_exit(); 1974 free_auto_defrag: 1975 btrfs_auto_defrag_exit(); 1976 free_delayed_inode: 1977 btrfs_delayed_inode_exit(); 1978 free_ordered_data: 1979 ordered_data_exit(); 1980 free_extent_map: 1981 extent_map_exit(); 1982 free_extent_io: 1983 extent_io_exit(); 1984 free_cachep: 1985 btrfs_destroy_cachep(); 1986 free_compress: 1987 btrfs_exit_compress(); 1988 btrfs_exit_sysfs(); 1989 free_hash: 1990 btrfs_hash_exit(); 1991 return err; 1992 } 1993 1994 static void __exit exit_btrfs_fs(void) 1995 { 1996 btrfs_destroy_cachep(); 1997 btrfs_delayed_ref_exit(); 1998 btrfs_auto_defrag_exit(); 1999 btrfs_delayed_inode_exit(); 2000 btrfs_prelim_ref_exit(); 2001 ordered_data_exit(); 2002 extent_map_exit(); 2003 extent_io_exit(); 2004 btrfs_interface_exit(); 2005 unregister_filesystem(&btrfs_fs_type); 2006 btrfs_exit_sysfs(); 2007 btrfs_cleanup_fs_uuids(); 2008 btrfs_exit_compress(); 2009 btrfs_hash_exit(); 2010 } 2011 2012 late_initcall(init_btrfs_fs); 2013 module_exit(exit_btrfs_fs) 2014 2015 MODULE_LICENSE("GPL"); 2016