1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2007 Oracle. All rights reserved.
6 #include <linux/blkdev.h>
7 #include <linux/module.h>
9 #include <linux/pagemap.h>
10 #include <linux/highmem.h>
11 #include <linux/time.h>
12 #include <linux/init.h>
13 #include <linux/seq_file.h>
14 #include <linux/string.h>
15 #include <linux/backing-dev.h>
16 #include <linux/mount.h>
17 #include <linux/writeback.h>
18 #include <linux/statfs.h>
19 #include <linux/compat.h>
20 #include <linux/parser.h>
21 #include <linux/ctype.h>
22 #include <linux/namei.h>
23 #include <linux/miscdevice.h>
24 #include <linux/magic.h>
25 #include <linux/slab.h>
26 #include <linux/cleancache.h>
27 #include <linux/ratelimit.h>
28 #include <linux/crc32c.h>
29 #include <linux/btrfs.h>
30 #include "delayed-inode.h"
33 #include "transaction.h"
34 #include "btrfs_inode.h"
35 #include "print-tree.h"
40 #include "compression.h"
41 #include "rcu-string.h"
42 #include "dev-replace.h"
43 #include "free-space-cache.h"
45 #include "space-info.h"
47 #include "tests/btrfs-tests.h"
48 #include "block-group.h"
52 #define CREATE_TRACE_POINTS
53 #include <trace/events/btrfs.h>
55 static const struct super_operations btrfs_super_ops;
58 * Types for mounting the default subvolume and a subvolume explicitly
59 * requested by subvol=/path. That way the callchain is straightforward and we
60 * don't have to play tricks with the mount options and recursive calls to
63 * The new btrfs_root_fs_type also servers as a tag for the bdev_holder.
65 static struct file_system_type btrfs_fs_type;
66 static struct file_system_type btrfs_root_fs_type;
68 static int btrfs_remount(struct super_block *sb, int *flags, char *data);
71 * Generally the error codes correspond to their respective errors, but there
72 * are a few special cases.
74 * EUCLEAN: Any sort of corruption that we encounter. The tree-checker for
75 * instance will return EUCLEAN if any of the blocks are corrupted in
76 * a way that is problematic. We want to reserve EUCLEAN for these
77 * sort of corruptions.
79 * EROFS: If we check BTRFS_FS_STATE_ERROR and fail out with a return error, we
80 * need to use EROFS for this case. We will have no idea of the
81 * original failure, that will have been reported at the time we tripped
82 * over the error. Each subsequent error that doesn't have any context
83 * of the original error should use EROFS when handling BTRFS_FS_STATE_ERROR.
85 const char * __attribute_const__ btrfs_decode_error(int errno)
87 char *errstr = "unknown";
90 case -ENOENT: /* -2 */
91 errstr = "No such entry";
94 errstr = "IO failure";
96 case -ENOMEM: /* -12*/
97 errstr = "Out of memory";
99 case -EEXIST: /* -17 */
100 errstr = "Object already exists";
102 case -ENOSPC: /* -28 */
103 errstr = "No space left";
105 case -EROFS: /* -30 */
106 errstr = "Readonly filesystem";
108 case -EOPNOTSUPP: /* -95 */
109 errstr = "Operation not supported";
111 case -EUCLEAN: /* -117 */
112 errstr = "Filesystem corrupted";
114 case -EDQUOT: /* -122 */
115 errstr = "Quota exceeded";
123 * __btrfs_handle_fs_error decodes expected errors from the caller and
124 * invokes the appropriate error response.
127 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
128 unsigned int line, int errno, const char *fmt, ...)
130 struct super_block *sb = fs_info->sb;
136 * Special case: if the error is EROFS, and we're already
137 * under SB_RDONLY, then it is safe here.
139 if (errno == -EROFS && sb_rdonly(sb))
143 errstr = btrfs_decode_error(errno);
145 struct va_format vaf;
152 pr_crit("BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n",
153 sb->s_id, function, line, errno, errstr, &vaf);
156 pr_crit("BTRFS: error (device %s) in %s:%d: errno=%d %s\n",
157 sb->s_id, function, line, errno, errstr);
162 * Today we only save the error info to memory. Long term we'll
163 * also send it down to the disk
165 set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state);
167 /* Don't go through full error handling during mount */
168 if (!(sb->s_flags & SB_BORN))
174 btrfs_discard_stop(fs_info);
176 /* btrfs handle error by forcing the filesystem readonly */
177 sb->s_flags |= SB_RDONLY;
178 btrfs_info(fs_info, "forced readonly");
180 * Note that a running device replace operation is not canceled here
181 * although there is no way to update the progress. It would add the
182 * risk of a deadlock, therefore the canceling is omitted. The only
183 * penalty is that some I/O remains active until the procedure
184 * completes. The next time when the filesystem is mounted writable
185 * again, the device replace operation continues.
190 static const char * const logtypes[] = {
203 * Use one ratelimit state per log level so that a flood of less important
204 * messages doesn't cause more important ones to be dropped.
206 static struct ratelimit_state printk_limits[] = {
207 RATELIMIT_STATE_INIT(printk_limits[0], DEFAULT_RATELIMIT_INTERVAL, 100),
208 RATELIMIT_STATE_INIT(printk_limits[1], DEFAULT_RATELIMIT_INTERVAL, 100),
209 RATELIMIT_STATE_INIT(printk_limits[2], DEFAULT_RATELIMIT_INTERVAL, 100),
210 RATELIMIT_STATE_INIT(printk_limits[3], DEFAULT_RATELIMIT_INTERVAL, 100),
211 RATELIMIT_STATE_INIT(printk_limits[4], DEFAULT_RATELIMIT_INTERVAL, 100),
212 RATELIMIT_STATE_INIT(printk_limits[5], DEFAULT_RATELIMIT_INTERVAL, 100),
213 RATELIMIT_STATE_INIT(printk_limits[6], DEFAULT_RATELIMIT_INTERVAL, 100),
214 RATELIMIT_STATE_INIT(printk_limits[7], DEFAULT_RATELIMIT_INTERVAL, 100),
217 void __cold btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
219 char lvl[PRINTK_MAX_SINGLE_HEADER_LEN + 1] = "\0";
220 struct va_format vaf;
223 const char *type = logtypes[4];
224 struct ratelimit_state *ratelimit = &printk_limits[4];
228 while ((kern_level = printk_get_level(fmt)) != 0) {
229 size_t size = printk_skip_level(fmt) - fmt;
231 if (kern_level >= '0' && kern_level <= '7') {
232 memcpy(lvl, fmt, size);
234 type = logtypes[kern_level - '0'];
235 ratelimit = &printk_limits[kern_level - '0'];
243 if (__ratelimit(ratelimit))
244 printk("%sBTRFS %s (device %s): %pV\n", lvl, type,
245 fs_info ? fs_info->sb->s_id : "<unknown>", &vaf);
252 * We only mark the transaction aborted and then set the file system read-only.
253 * This will prevent new transactions from starting or trying to join this
256 * This means that error recovery at the call site is limited to freeing
257 * any local memory allocations and passing the error code up without
258 * further cleanup. The transaction should complete as it normally would
259 * in the call path but will return -EIO.
261 * We'll complete the cleanup in btrfs_end_transaction and
262 * btrfs_commit_transaction.
265 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
266 const char *function,
267 unsigned int line, int errno)
269 struct btrfs_fs_info *fs_info = trans->fs_info;
271 WRITE_ONCE(trans->aborted, errno);
272 /* Nothing used. The other threads that have joined this
273 * transaction may be able to continue. */
274 if (!trans->dirty && list_empty(&trans->new_bgs)) {
277 errstr = btrfs_decode_error(errno);
279 "%s:%d: Aborting unused transaction(%s).",
280 function, line, errstr);
283 WRITE_ONCE(trans->transaction->aborted, errno);
284 /* Wake up anybody who may be waiting on this transaction */
285 wake_up(&fs_info->transaction_wait);
286 wake_up(&fs_info->transaction_blocked_wait);
287 __btrfs_handle_fs_error(fs_info, function, line, errno, NULL);
290 * __btrfs_panic decodes unexpected, fatal errors from the caller,
291 * issues an alert, and either panics or BUGs, depending on mount options.
294 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
295 unsigned int line, int errno, const char *fmt, ...)
297 char *s_id = "<unknown>";
299 struct va_format vaf = { .fmt = fmt };
303 s_id = fs_info->sb->s_id;
308 errstr = btrfs_decode_error(errno);
309 if (fs_info && (btrfs_test_opt(fs_info, PANIC_ON_FATAL_ERROR)))
310 panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n",
311 s_id, function, line, &vaf, errno, errstr);
313 btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)",
314 function, line, &vaf, errno, errstr);
316 /* Caller calls BUG() */
319 static void btrfs_put_super(struct super_block *sb)
321 close_ctree(btrfs_sb(sb));
330 Opt_compress_force_type,
335 Opt_flushoncommit, Opt_noflushoncommit,
336 Opt_inode_cache, Opt_noinode_cache,
338 Opt_barrier, Opt_nobarrier,
339 Opt_datacow, Opt_nodatacow,
340 Opt_datasum, Opt_nodatasum,
341 Opt_defrag, Opt_nodefrag,
342 Opt_discard, Opt_nodiscard,
346 Opt_rescan_uuid_tree,
348 Opt_space_cache, Opt_no_space_cache,
349 Opt_space_cache_version,
351 Opt_ssd_spread, Opt_nossd_spread,
356 Opt_treelog, Opt_notreelog,
357 Opt_user_subvol_rm_allowed,
364 /* Deprecated options */
367 /* Debugging options */
369 Opt_check_integrity_including_extent_data,
370 Opt_check_integrity_print_mask,
371 Opt_enospc_debug, Opt_noenospc_debug,
372 #ifdef CONFIG_BTRFS_DEBUG
373 Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all,
375 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
381 static const match_table_t tokens = {
383 {Opt_noacl, "noacl"},
384 {Opt_clear_cache, "clear_cache"},
385 {Opt_commit_interval, "commit=%u"},
386 {Opt_compress, "compress"},
387 {Opt_compress_type, "compress=%s"},
388 {Opt_compress_force, "compress-force"},
389 {Opt_compress_force_type, "compress-force=%s"},
390 {Opt_degraded, "degraded"},
391 {Opt_device, "device=%s"},
392 {Opt_fatal_errors, "fatal_errors=%s"},
393 {Opt_flushoncommit, "flushoncommit"},
394 {Opt_noflushoncommit, "noflushoncommit"},
395 {Opt_inode_cache, "inode_cache"},
396 {Opt_noinode_cache, "noinode_cache"},
397 {Opt_max_inline, "max_inline=%s"},
398 {Opt_barrier, "barrier"},
399 {Opt_nobarrier, "nobarrier"},
400 {Opt_datacow, "datacow"},
401 {Opt_nodatacow, "nodatacow"},
402 {Opt_datasum, "datasum"},
403 {Opt_nodatasum, "nodatasum"},
404 {Opt_defrag, "autodefrag"},
405 {Opt_nodefrag, "noautodefrag"},
406 {Opt_discard, "discard"},
407 {Opt_discard_mode, "discard=%s"},
408 {Opt_nodiscard, "nodiscard"},
409 {Opt_norecovery, "norecovery"},
410 {Opt_ratio, "metadata_ratio=%u"},
411 {Opt_rescan_uuid_tree, "rescan_uuid_tree"},
412 {Opt_skip_balance, "skip_balance"},
413 {Opt_space_cache, "space_cache"},
414 {Opt_no_space_cache, "nospace_cache"},
415 {Opt_space_cache_version, "space_cache=%s"},
417 {Opt_nossd, "nossd"},
418 {Opt_ssd_spread, "ssd_spread"},
419 {Opt_nossd_spread, "nossd_spread"},
420 {Opt_subvol, "subvol=%s"},
421 {Opt_subvol_empty, "subvol="},
422 {Opt_subvolid, "subvolid=%s"},
423 {Opt_thread_pool, "thread_pool=%u"},
424 {Opt_treelog, "treelog"},
425 {Opt_notreelog, "notreelog"},
426 {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"},
429 {Opt_rescue, "rescue=%s"},
430 /* Deprecated, with alias rescue=nologreplay */
431 {Opt_nologreplay, "nologreplay"},
432 /* Deprecated, with alias rescue=usebackuproot */
433 {Opt_usebackuproot, "usebackuproot"},
435 /* Deprecated options */
436 {Opt_recovery, "recovery"},
438 /* Debugging options */
439 {Opt_check_integrity, "check_int"},
440 {Opt_check_integrity_including_extent_data, "check_int_data"},
441 {Opt_check_integrity_print_mask, "check_int_print_mask=%u"},
442 {Opt_enospc_debug, "enospc_debug"},
443 {Opt_noenospc_debug, "noenospc_debug"},
444 #ifdef CONFIG_BTRFS_DEBUG
445 {Opt_fragment_data, "fragment=data"},
446 {Opt_fragment_metadata, "fragment=metadata"},
447 {Opt_fragment_all, "fragment=all"},
449 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
450 {Opt_ref_verify, "ref_verify"},
455 static const match_table_t rescue_tokens = {
456 {Opt_usebackuproot, "usebackuproot"},
457 {Opt_nologreplay, "nologreplay"},
461 static int parse_rescue_options(struct btrfs_fs_info *info, const char *options)
466 substring_t args[MAX_OPT_ARGS];
469 opts = kstrdup(options, GFP_KERNEL);
474 while ((p = strsep(&opts, ":")) != NULL) {
479 token = match_token(p, rescue_tokens, args);
481 case Opt_usebackuproot:
483 "trying to use backup root at mount time");
484 btrfs_set_opt(info->mount_opt, USEBACKUPROOT);
486 case Opt_nologreplay:
487 btrfs_set_and_info(info, NOLOGREPLAY,
488 "disabling log replay at mount time");
491 btrfs_info(info, "unrecognized rescue option '%s'", p);
505 * Regular mount options parser. Everything that is needed only when
506 * reading in a new superblock is parsed here.
507 * XXX JDM: This needs to be cleaned up for remount.
509 int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
510 unsigned long new_flags)
512 substring_t args[MAX_OPT_ARGS];
518 bool compress_force = false;
519 enum btrfs_compression_type saved_compress_type;
520 int saved_compress_level;
521 bool saved_compress_force;
524 cache_gen = btrfs_super_cache_generation(info->super_copy);
525 if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE))
526 btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE);
528 btrfs_set_opt(info->mount_opt, SPACE_CACHE);
531 * Even the options are empty, we still need to do extra check
537 while ((p = strsep(&options, ",")) != NULL) {
542 token = match_token(p, tokens, args);
545 btrfs_info(info, "allowing degraded mounts");
546 btrfs_set_opt(info->mount_opt, DEGRADED);
549 case Opt_subvol_empty:
553 * These are parsed by btrfs_parse_subvol_options or
554 * btrfs_parse_device_options and can be ignored here.
558 btrfs_set_and_info(info, NODATASUM,
559 "setting nodatasum");
562 if (btrfs_test_opt(info, NODATASUM)) {
563 if (btrfs_test_opt(info, NODATACOW))
565 "setting datasum, datacow enabled");
567 btrfs_info(info, "setting datasum");
569 btrfs_clear_opt(info->mount_opt, NODATACOW);
570 btrfs_clear_opt(info->mount_opt, NODATASUM);
573 if (!btrfs_test_opt(info, NODATACOW)) {
574 if (!btrfs_test_opt(info, COMPRESS) ||
575 !btrfs_test_opt(info, FORCE_COMPRESS)) {
577 "setting nodatacow, compression disabled");
579 btrfs_info(info, "setting nodatacow");
582 btrfs_clear_opt(info->mount_opt, COMPRESS);
583 btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);
584 btrfs_set_opt(info->mount_opt, NODATACOW);
585 btrfs_set_opt(info->mount_opt, NODATASUM);
588 btrfs_clear_and_info(info, NODATACOW,
591 case Opt_compress_force:
592 case Opt_compress_force_type:
593 compress_force = true;
596 case Opt_compress_type:
597 saved_compress_type = btrfs_test_opt(info,
599 info->compress_type : BTRFS_COMPRESS_NONE;
600 saved_compress_force =
601 btrfs_test_opt(info, FORCE_COMPRESS);
602 saved_compress_level = info->compress_level;
603 if (token == Opt_compress ||
604 token == Opt_compress_force ||
605 strncmp(args[0].from, "zlib", 4) == 0) {
606 compress_type = "zlib";
608 info->compress_type = BTRFS_COMPRESS_ZLIB;
609 info->compress_level = BTRFS_ZLIB_DEFAULT_LEVEL;
611 * args[0] contains uninitialized data since
612 * for these tokens we don't expect any
615 if (token != Opt_compress &&
616 token != Opt_compress_force)
617 info->compress_level =
618 btrfs_compress_str2level(
621 btrfs_set_opt(info->mount_opt, COMPRESS);
622 btrfs_clear_opt(info->mount_opt, NODATACOW);
623 btrfs_clear_opt(info->mount_opt, NODATASUM);
625 } else if (strncmp(args[0].from, "lzo", 3) == 0) {
626 compress_type = "lzo";
627 info->compress_type = BTRFS_COMPRESS_LZO;
628 btrfs_set_opt(info->mount_opt, COMPRESS);
629 btrfs_clear_opt(info->mount_opt, NODATACOW);
630 btrfs_clear_opt(info->mount_opt, NODATASUM);
631 btrfs_set_fs_incompat(info, COMPRESS_LZO);
633 } else if (strncmp(args[0].from, "zstd", 4) == 0) {
634 compress_type = "zstd";
635 info->compress_type = BTRFS_COMPRESS_ZSTD;
636 info->compress_level =
637 btrfs_compress_str2level(
640 btrfs_set_opt(info->mount_opt, COMPRESS);
641 btrfs_clear_opt(info->mount_opt, NODATACOW);
642 btrfs_clear_opt(info->mount_opt, NODATASUM);
643 btrfs_set_fs_incompat(info, COMPRESS_ZSTD);
645 } else if (strncmp(args[0].from, "no", 2) == 0) {
646 compress_type = "no";
647 info->compress_level = 0;
648 info->compress_type = 0;
649 btrfs_clear_opt(info->mount_opt, COMPRESS);
650 btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);
651 compress_force = false;
658 if (compress_force) {
659 btrfs_set_opt(info->mount_opt, FORCE_COMPRESS);
662 * If we remount from compress-force=xxx to
663 * compress=xxx, we need clear FORCE_COMPRESS
664 * flag, otherwise, there is no way for users
665 * to disable forcible compression separately.
667 btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);
669 if (no_compress == 1) {
670 btrfs_info(info, "use no compression");
671 } else if ((info->compress_type != saved_compress_type) ||
672 (compress_force != saved_compress_force) ||
673 (info->compress_level != saved_compress_level)) {
674 btrfs_info(info, "%s %s compression, level %d",
675 (compress_force) ? "force" : "use",
676 compress_type, info->compress_level);
678 compress_force = false;
681 btrfs_set_and_info(info, SSD,
682 "enabling ssd optimizations");
683 btrfs_clear_opt(info->mount_opt, NOSSD);
686 btrfs_set_and_info(info, SSD,
687 "enabling ssd optimizations");
688 btrfs_set_and_info(info, SSD_SPREAD,
689 "using spread ssd allocation scheme");
690 btrfs_clear_opt(info->mount_opt, NOSSD);
693 btrfs_set_opt(info->mount_opt, NOSSD);
694 btrfs_clear_and_info(info, SSD,
695 "not using ssd optimizations");
697 case Opt_nossd_spread:
698 btrfs_clear_and_info(info, SSD_SPREAD,
699 "not using spread ssd allocation scheme");
702 btrfs_clear_and_info(info, NOBARRIER,
703 "turning on barriers");
706 btrfs_set_and_info(info, NOBARRIER,
707 "turning off barriers");
709 case Opt_thread_pool:
710 ret = match_int(&args[0], &intarg);
713 } else if (intarg == 0) {
717 info->thread_pool_size = intarg;
720 num = match_strdup(&args[0]);
722 info->max_inline = memparse(num, NULL);
725 if (info->max_inline) {
726 info->max_inline = min_t(u64,
730 btrfs_info(info, "max_inline at %llu",
738 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
739 info->sb->s_flags |= SB_POSIXACL;
742 btrfs_err(info, "support for ACL not compiled in!");
747 info->sb->s_flags &= ~SB_POSIXACL;
750 btrfs_set_and_info(info, NOTREELOG,
751 "disabling tree log");
754 btrfs_clear_and_info(info, NOTREELOG,
755 "enabling tree log");
758 case Opt_nologreplay:
760 "'nologreplay' is deprecated, use 'rescue=nologreplay' instead");
761 btrfs_set_and_info(info, NOLOGREPLAY,
762 "disabling log replay at mount time");
764 case Opt_flushoncommit:
765 btrfs_set_and_info(info, FLUSHONCOMMIT,
766 "turning on flush-on-commit");
768 case Opt_noflushoncommit:
769 btrfs_clear_and_info(info, FLUSHONCOMMIT,
770 "turning off flush-on-commit");
773 ret = match_int(&args[0], &intarg);
776 info->metadata_ratio = intarg;
777 btrfs_info(info, "metadata ratio %u",
778 info->metadata_ratio);
781 case Opt_discard_mode:
782 if (token == Opt_discard ||
783 strcmp(args[0].from, "sync") == 0) {
784 btrfs_clear_opt(info->mount_opt, DISCARD_ASYNC);
785 btrfs_set_and_info(info, DISCARD_SYNC,
786 "turning on sync discard");
787 } else if (strcmp(args[0].from, "async") == 0) {
788 btrfs_clear_opt(info->mount_opt, DISCARD_SYNC);
789 btrfs_set_and_info(info, DISCARD_ASYNC,
790 "turning on async discard");
797 btrfs_clear_and_info(info, DISCARD_SYNC,
798 "turning off discard");
799 btrfs_clear_and_info(info, DISCARD_ASYNC,
800 "turning off async discard");
802 case Opt_space_cache:
803 case Opt_space_cache_version:
804 if (token == Opt_space_cache ||
805 strcmp(args[0].from, "v1") == 0) {
806 btrfs_clear_opt(info->mount_opt,
808 btrfs_set_and_info(info, SPACE_CACHE,
809 "enabling disk space caching");
810 } else if (strcmp(args[0].from, "v2") == 0) {
811 btrfs_clear_opt(info->mount_opt,
813 btrfs_set_and_info(info, FREE_SPACE_TREE,
814 "enabling free space tree");
820 case Opt_rescan_uuid_tree:
821 btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE);
823 case Opt_no_space_cache:
824 if (btrfs_test_opt(info, SPACE_CACHE)) {
825 btrfs_clear_and_info(info, SPACE_CACHE,
826 "disabling disk space caching");
828 if (btrfs_test_opt(info, FREE_SPACE_TREE)) {
829 btrfs_clear_and_info(info, FREE_SPACE_TREE,
830 "disabling free space tree");
833 case Opt_inode_cache:
835 "the 'inode_cache' option is deprecated and will have no effect from 5.11");
836 btrfs_set_pending_and_info(info, INODE_MAP_CACHE,
837 "enabling inode map caching");
839 case Opt_noinode_cache:
840 btrfs_clear_pending_and_info(info, INODE_MAP_CACHE,
841 "disabling inode map caching");
843 case Opt_clear_cache:
844 btrfs_set_and_info(info, CLEAR_CACHE,
845 "force clearing of disk cache");
847 case Opt_user_subvol_rm_allowed:
848 btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED);
850 case Opt_enospc_debug:
851 btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG);
853 case Opt_noenospc_debug:
854 btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG);
857 btrfs_set_and_info(info, AUTO_DEFRAG,
858 "enabling auto defrag");
861 btrfs_clear_and_info(info, AUTO_DEFRAG,
862 "disabling auto defrag");
865 case Opt_usebackuproot:
867 "'%s' is deprecated, use 'rescue=usebackuproot' instead",
868 token == Opt_recovery ? "recovery" :
871 "trying to use backup root at mount time");
872 btrfs_set_opt(info->mount_opt, USEBACKUPROOT);
874 case Opt_skip_balance:
875 btrfs_set_opt(info->mount_opt, SKIP_BALANCE);
877 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
878 case Opt_check_integrity_including_extent_data:
880 "enabling check integrity including extent data");
881 btrfs_set_opt(info->mount_opt,
882 CHECK_INTEGRITY_INCLUDING_EXTENT_DATA);
883 btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY);
885 case Opt_check_integrity:
886 btrfs_info(info, "enabling check integrity");
887 btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY);
889 case Opt_check_integrity_print_mask:
890 ret = match_int(&args[0], &intarg);
893 info->check_integrity_print_mask = intarg;
894 btrfs_info(info, "check_integrity_print_mask 0x%x",
895 info->check_integrity_print_mask);
898 case Opt_check_integrity_including_extent_data:
899 case Opt_check_integrity:
900 case Opt_check_integrity_print_mask:
902 "support for check_integrity* not compiled in!");
906 case Opt_fatal_errors:
907 if (strcmp(args[0].from, "panic") == 0)
908 btrfs_set_opt(info->mount_opt,
909 PANIC_ON_FATAL_ERROR);
910 else if (strcmp(args[0].from, "bug") == 0)
911 btrfs_clear_opt(info->mount_opt,
912 PANIC_ON_FATAL_ERROR);
918 case Opt_commit_interval:
920 ret = match_int(&args[0], &intarg);
925 "using default commit interval %us",
926 BTRFS_DEFAULT_COMMIT_INTERVAL);
927 intarg = BTRFS_DEFAULT_COMMIT_INTERVAL;
928 } else if (intarg > 300) {
929 btrfs_warn(info, "excessive commit interval %d",
932 info->commit_interval = intarg;
935 ret = parse_rescue_options(info, args[0].from);
939 #ifdef CONFIG_BTRFS_DEBUG
940 case Opt_fragment_all:
941 btrfs_info(info, "fragmenting all space");
942 btrfs_set_opt(info->mount_opt, FRAGMENT_DATA);
943 btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA);
945 case Opt_fragment_metadata:
946 btrfs_info(info, "fragmenting metadata");
947 btrfs_set_opt(info->mount_opt,
950 case Opt_fragment_data:
951 btrfs_info(info, "fragmenting data");
952 btrfs_set_opt(info->mount_opt, FRAGMENT_DATA);
955 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
957 btrfs_info(info, "doing ref verification");
958 btrfs_set_opt(info->mount_opt, REF_VERIFY);
962 btrfs_err(info, "unrecognized mount option '%s'", p);
971 * Extra check for current option against current flag
973 if (btrfs_test_opt(info, NOLOGREPLAY) && !(new_flags & SB_RDONLY)) {
975 "nologreplay must be used with ro mount option");
979 if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE) &&
980 !btrfs_test_opt(info, FREE_SPACE_TREE) &&
981 !btrfs_test_opt(info, CLEAR_CACHE)) {
982 btrfs_err(info, "cannot disable free space tree");
986 if (!ret && btrfs_test_opt(info, SPACE_CACHE))
987 btrfs_info(info, "disk space caching is enabled");
988 if (!ret && btrfs_test_opt(info, FREE_SPACE_TREE))
989 btrfs_info(info, "using free space tree");
994 * Parse mount options that are required early in the mount process.
996 * All other options will be parsed on much later in the mount process and
997 * only when we need to allocate a new super block.
999 static int btrfs_parse_device_options(const char *options, fmode_t flags,
1002 substring_t args[MAX_OPT_ARGS];
1003 char *device_name, *opts, *orig, *p;
1004 struct btrfs_device *device = NULL;
1007 lockdep_assert_held(&uuid_mutex);
1013 * strsep changes the string, duplicate it because btrfs_parse_options
1016 opts = kstrdup(options, GFP_KERNEL);
1021 while ((p = strsep(&opts, ",")) != NULL) {
1027 token = match_token(p, tokens, args);
1028 if (token == Opt_device) {
1029 device_name = match_strdup(&args[0]);
1034 device = btrfs_scan_one_device(device_name, flags,
1037 if (IS_ERR(device)) {
1038 error = PTR_ERR(device);
1050 * Parse mount options that are related to subvolume id
1052 * The value is later passed to mount_subvol()
1054 static int btrfs_parse_subvol_options(const char *options, char **subvol_name,
1055 u64 *subvol_objectid)
1057 substring_t args[MAX_OPT_ARGS];
1058 char *opts, *orig, *p;
1066 * strsep changes the string, duplicate it because
1067 * btrfs_parse_device_options gets called later
1069 opts = kstrdup(options, GFP_KERNEL);
1074 while ((p = strsep(&opts, ",")) != NULL) {
1079 token = match_token(p, tokens, args);
1082 kfree(*subvol_name);
1083 *subvol_name = match_strdup(&args[0]);
1084 if (!*subvol_name) {
1090 error = match_u64(&args[0], &subvolid);
1094 /* we want the original fs_tree */
1096 subvolid = BTRFS_FS_TREE_OBJECTID;
1098 *subvol_objectid = subvolid;
1110 char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,
1111 u64 subvol_objectid)
1113 struct btrfs_root *root = fs_info->tree_root;
1114 struct btrfs_root *fs_root = NULL;
1115 struct btrfs_root_ref *root_ref;
1116 struct btrfs_inode_ref *inode_ref;
1117 struct btrfs_key key;
1118 struct btrfs_path *path = NULL;
1119 char *name = NULL, *ptr;
1124 path = btrfs_alloc_path();
1129 path->leave_spinning = 1;
1131 name = kmalloc(PATH_MAX, GFP_KERNEL);
1136 ptr = name + PATH_MAX - 1;
1140 * Walk up the subvolume trees in the tree of tree roots by root
1141 * backrefs until we hit the top-level subvolume.
1143 while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) {
1144 key.objectid = subvol_objectid;
1145 key.type = BTRFS_ROOT_BACKREF_KEY;
1146 key.offset = (u64)-1;
1148 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1151 } else if (ret > 0) {
1152 ret = btrfs_previous_item(root, path, subvol_objectid,
1153 BTRFS_ROOT_BACKREF_KEY);
1156 } else if (ret > 0) {
1162 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1163 subvol_objectid = key.offset;
1165 root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
1166 struct btrfs_root_ref);
1167 len = btrfs_root_ref_name_len(path->nodes[0], root_ref);
1170 ret = -ENAMETOOLONG;
1173 read_extent_buffer(path->nodes[0], ptr + 1,
1174 (unsigned long)(root_ref + 1), len);
1176 dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref);
1177 btrfs_release_path(path);
1179 fs_root = btrfs_get_fs_root(fs_info, subvol_objectid, true);
1180 if (IS_ERR(fs_root)) {
1181 ret = PTR_ERR(fs_root);
1187 * Walk up the filesystem tree by inode refs until we hit the
1190 while (dirid != BTRFS_FIRST_FREE_OBJECTID) {
1191 key.objectid = dirid;
1192 key.type = BTRFS_INODE_REF_KEY;
1193 key.offset = (u64)-1;
1195 ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0);
1198 } else if (ret > 0) {
1199 ret = btrfs_previous_item(fs_root, path, dirid,
1200 BTRFS_INODE_REF_KEY);
1203 } else if (ret > 0) {
1209 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1212 inode_ref = btrfs_item_ptr(path->nodes[0],
1214 struct btrfs_inode_ref);
1215 len = btrfs_inode_ref_name_len(path->nodes[0],
1219 ret = -ENAMETOOLONG;
1222 read_extent_buffer(path->nodes[0], ptr + 1,
1223 (unsigned long)(inode_ref + 1), len);
1225 btrfs_release_path(path);
1227 btrfs_put_root(fs_root);
1231 btrfs_free_path(path);
1232 if (ptr == name + PATH_MAX - 1) {
1236 memmove(name, ptr, name + PATH_MAX - ptr);
1241 btrfs_put_root(fs_root);
1242 btrfs_free_path(path);
1244 return ERR_PTR(ret);
1247 static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid)
1249 struct btrfs_root *root = fs_info->tree_root;
1250 struct btrfs_dir_item *di;
1251 struct btrfs_path *path;
1252 struct btrfs_key location;
1255 path = btrfs_alloc_path();
1258 path->leave_spinning = 1;
1261 * Find the "default" dir item which points to the root item that we
1262 * will mount by default if we haven't been given a specific subvolume
1265 dir_id = btrfs_super_root_dir(fs_info->super_copy);
1266 di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0);
1268 btrfs_free_path(path);
1273 * Ok the default dir item isn't there. This is weird since
1274 * it's always been there, but don't freak out, just try and
1275 * mount the top-level subvolume.
1277 btrfs_free_path(path);
1278 *objectid = BTRFS_FS_TREE_OBJECTID;
1282 btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location);
1283 btrfs_free_path(path);
1284 *objectid = location.objectid;
1288 static int btrfs_fill_super(struct super_block *sb,
1289 struct btrfs_fs_devices *fs_devices,
1292 struct inode *inode;
1293 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
1296 sb->s_maxbytes = MAX_LFS_FILESIZE;
1297 sb->s_magic = BTRFS_SUPER_MAGIC;
1298 sb->s_op = &btrfs_super_ops;
1299 sb->s_d_op = &btrfs_dentry_operations;
1300 sb->s_export_op = &btrfs_export_ops;
1301 sb->s_xattr = btrfs_xattr_handlers;
1302 sb->s_time_gran = 1;
1303 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
1304 sb->s_flags |= SB_POSIXACL;
1306 sb->s_flags |= SB_I_VERSION;
1307 sb->s_iflags |= SB_I_CGROUPWB;
1309 err = super_setup_bdi(sb);
1311 btrfs_err(fs_info, "super_setup_bdi failed");
1315 err = open_ctree(sb, fs_devices, (char *)data);
1317 btrfs_err(fs_info, "open_ctree failed");
1321 inode = btrfs_iget(sb, BTRFS_FIRST_FREE_OBJECTID, fs_info->fs_root);
1322 if (IS_ERR(inode)) {
1323 err = PTR_ERR(inode);
1327 sb->s_root = d_make_root(inode);
1333 cleancache_init_fs(sb);
1334 sb->s_flags |= SB_ACTIVE;
1338 close_ctree(fs_info);
1342 int btrfs_sync_fs(struct super_block *sb, int wait)
1344 struct btrfs_trans_handle *trans;
1345 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
1346 struct btrfs_root *root = fs_info->tree_root;
1348 trace_btrfs_sync_fs(fs_info, wait);
1351 filemap_flush(fs_info->btree_inode->i_mapping);
1355 btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1);
1357 trans = btrfs_attach_transaction_barrier(root);
1358 if (IS_ERR(trans)) {
1359 /* no transaction, don't bother */
1360 if (PTR_ERR(trans) == -ENOENT) {
1362 * Exit unless we have some pending changes
1363 * that need to go through commit
1365 if (fs_info->pending_changes == 0)
1368 * A non-blocking test if the fs is frozen. We must not
1369 * start a new transaction here otherwise a deadlock
1370 * happens. The pending operations are delayed to the
1371 * next commit after thawing.
1373 if (sb_start_write_trylock(sb))
1377 trans = btrfs_start_transaction(root, 0);
1380 return PTR_ERR(trans);
1382 return btrfs_commit_transaction(trans);
1385 static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
1387 struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb);
1388 const char *compress_type;
1389 const char *subvol_name;
1391 if (btrfs_test_opt(info, DEGRADED))
1392 seq_puts(seq, ",degraded");
1393 if (btrfs_test_opt(info, NODATASUM))
1394 seq_puts(seq, ",nodatasum");
1395 if (btrfs_test_opt(info, NODATACOW))
1396 seq_puts(seq, ",nodatacow");
1397 if (btrfs_test_opt(info, NOBARRIER))
1398 seq_puts(seq, ",nobarrier");
1399 if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE)
1400 seq_printf(seq, ",max_inline=%llu", info->max_inline);
1401 if (info->thread_pool_size != min_t(unsigned long,
1402 num_online_cpus() + 2, 8))
1403 seq_printf(seq, ",thread_pool=%u", info->thread_pool_size);
1404 if (btrfs_test_opt(info, COMPRESS)) {
1405 compress_type = btrfs_compress_type2str(info->compress_type);
1406 if (btrfs_test_opt(info, FORCE_COMPRESS))
1407 seq_printf(seq, ",compress-force=%s", compress_type);
1409 seq_printf(seq, ",compress=%s", compress_type);
1410 if (info->compress_level)
1411 seq_printf(seq, ":%d", info->compress_level);
1413 if (btrfs_test_opt(info, NOSSD))
1414 seq_puts(seq, ",nossd");
1415 if (btrfs_test_opt(info, SSD_SPREAD))
1416 seq_puts(seq, ",ssd_spread");
1417 else if (btrfs_test_opt(info, SSD))
1418 seq_puts(seq, ",ssd");
1419 if (btrfs_test_opt(info, NOTREELOG))
1420 seq_puts(seq, ",notreelog");
1421 if (btrfs_test_opt(info, NOLOGREPLAY))
1422 seq_puts(seq, ",rescue=nologreplay");
1423 if (btrfs_test_opt(info, FLUSHONCOMMIT))
1424 seq_puts(seq, ",flushoncommit");
1425 if (btrfs_test_opt(info, DISCARD_SYNC))
1426 seq_puts(seq, ",discard");
1427 if (btrfs_test_opt(info, DISCARD_ASYNC))
1428 seq_puts(seq, ",discard=async");
1429 if (!(info->sb->s_flags & SB_POSIXACL))
1430 seq_puts(seq, ",noacl");
1431 if (btrfs_test_opt(info, SPACE_CACHE))
1432 seq_puts(seq, ",space_cache");
1433 else if (btrfs_test_opt(info, FREE_SPACE_TREE))
1434 seq_puts(seq, ",space_cache=v2");
1436 seq_puts(seq, ",nospace_cache");
1437 if (btrfs_test_opt(info, RESCAN_UUID_TREE))
1438 seq_puts(seq, ",rescan_uuid_tree");
1439 if (btrfs_test_opt(info, CLEAR_CACHE))
1440 seq_puts(seq, ",clear_cache");
1441 if (btrfs_test_opt(info, USER_SUBVOL_RM_ALLOWED))
1442 seq_puts(seq, ",user_subvol_rm_allowed");
1443 if (btrfs_test_opt(info, ENOSPC_DEBUG))
1444 seq_puts(seq, ",enospc_debug");
1445 if (btrfs_test_opt(info, AUTO_DEFRAG))
1446 seq_puts(seq, ",autodefrag");
1447 if (btrfs_test_opt(info, INODE_MAP_CACHE))
1448 seq_puts(seq, ",inode_cache");
1449 if (btrfs_test_opt(info, SKIP_BALANCE))
1450 seq_puts(seq, ",skip_balance");
1451 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
1452 if (btrfs_test_opt(info, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA))
1453 seq_puts(seq, ",check_int_data");
1454 else if (btrfs_test_opt(info, CHECK_INTEGRITY))
1455 seq_puts(seq, ",check_int");
1456 if (info->check_integrity_print_mask)
1457 seq_printf(seq, ",check_int_print_mask=%d",
1458 info->check_integrity_print_mask);
1460 if (info->metadata_ratio)
1461 seq_printf(seq, ",metadata_ratio=%u", info->metadata_ratio);
1462 if (btrfs_test_opt(info, PANIC_ON_FATAL_ERROR))
1463 seq_puts(seq, ",fatal_errors=panic");
1464 if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL)
1465 seq_printf(seq, ",commit=%u", info->commit_interval);
1466 #ifdef CONFIG_BTRFS_DEBUG
1467 if (btrfs_test_opt(info, FRAGMENT_DATA))
1468 seq_puts(seq, ",fragment=data");
1469 if (btrfs_test_opt(info, FRAGMENT_METADATA))
1470 seq_puts(seq, ",fragment=metadata");
1472 if (btrfs_test_opt(info, REF_VERIFY))
1473 seq_puts(seq, ",ref_verify");
1474 seq_printf(seq, ",subvolid=%llu",
1475 BTRFS_I(d_inode(dentry))->root->root_key.objectid);
1476 subvol_name = btrfs_get_subvol_name_from_objectid(info,
1477 BTRFS_I(d_inode(dentry))->root->root_key.objectid);
1478 if (!IS_ERR(subvol_name)) {
1479 seq_puts(seq, ",subvol=");
1480 seq_escape(seq, subvol_name, " \t\n\\");
1486 static int btrfs_test_super(struct super_block *s, void *data)
1488 struct btrfs_fs_info *p = data;
1489 struct btrfs_fs_info *fs_info = btrfs_sb(s);
1491 return fs_info->fs_devices == p->fs_devices;
1494 static int btrfs_set_super(struct super_block *s, void *data)
1496 int err = set_anon_super(s, data);
1498 s->s_fs_info = data;
1503 * subvolumes are identified by ino 256
1505 static inline int is_subvolume_inode(struct inode *inode)
1507 if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
1512 static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid,
1513 struct vfsmount *mnt)
1515 struct dentry *root;
1519 if (!subvol_objectid) {
1520 ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb),
1523 root = ERR_PTR(ret);
1527 subvol_name = btrfs_get_subvol_name_from_objectid(
1528 btrfs_sb(mnt->mnt_sb), subvol_objectid);
1529 if (IS_ERR(subvol_name)) {
1530 root = ERR_CAST(subvol_name);
1537 root = mount_subtree(mnt, subvol_name);
1538 /* mount_subtree() drops our reference on the vfsmount. */
1541 if (!IS_ERR(root)) {
1542 struct super_block *s = root->d_sb;
1543 struct btrfs_fs_info *fs_info = btrfs_sb(s);
1544 struct inode *root_inode = d_inode(root);
1545 u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid;
1548 if (!is_subvolume_inode(root_inode)) {
1549 btrfs_err(fs_info, "'%s' is not a valid subvolume",
1553 if (subvol_objectid && root_objectid != subvol_objectid) {
1555 * This will also catch a race condition where a
1556 * subvolume which was passed by ID is renamed and
1557 * another subvolume is renamed over the old location.
1560 "subvol '%s' does not match subvolid %llu",
1561 subvol_name, subvol_objectid);
1566 root = ERR_PTR(ret);
1567 deactivate_locked_super(s);
1578 * Find a superblock for the given device / mount point.
1580 * Note: This is based on mount_bdev from fs/super.c with a few additions
1581 * for multiple device setup. Make sure to keep it in sync.
1583 static struct dentry *btrfs_mount_root(struct file_system_type *fs_type,
1584 int flags, const char *device_name, void *data)
1586 struct block_device *bdev = NULL;
1587 struct super_block *s;
1588 struct btrfs_device *device = NULL;
1589 struct btrfs_fs_devices *fs_devices = NULL;
1590 struct btrfs_fs_info *fs_info = NULL;
1591 void *new_sec_opts = NULL;
1592 fmode_t mode = FMODE_READ;
1595 if (!(flags & SB_RDONLY))
1596 mode |= FMODE_WRITE;
1599 error = security_sb_eat_lsm_opts(data, &new_sec_opts);
1601 return ERR_PTR(error);
1605 * Setup a dummy root and fs_info for test/set super. This is because
1606 * we don't actually fill this stuff out until open_ctree, but we need
1607 * then open_ctree will properly initialize the file system specific
1608 * settings later. btrfs_init_fs_info initializes the static elements
1609 * of the fs_info (locks and such) to make cleanup easier if we find a
1610 * superblock with our given fs_devices later on at sget() time.
1612 fs_info = kvzalloc(sizeof(struct btrfs_fs_info), GFP_KERNEL);
1615 goto error_sec_opts;
1617 btrfs_init_fs_info(fs_info);
1619 fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL);
1620 fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL);
1621 if (!fs_info->super_copy || !fs_info->super_for_commit) {
1626 mutex_lock(&uuid_mutex);
1627 error = btrfs_parse_device_options(data, mode, fs_type);
1629 mutex_unlock(&uuid_mutex);
1633 device = btrfs_scan_one_device(device_name, mode, fs_type);
1634 if (IS_ERR(device)) {
1635 mutex_unlock(&uuid_mutex);
1636 error = PTR_ERR(device);
1640 fs_devices = device->fs_devices;
1641 fs_info->fs_devices = fs_devices;
1643 error = btrfs_open_devices(fs_devices, mode, fs_type);
1644 mutex_unlock(&uuid_mutex);
1648 if (!(flags & SB_RDONLY) && fs_devices->rw_devices == 0) {
1650 goto error_close_devices;
1653 bdev = fs_devices->latest_bdev;
1654 s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | SB_NOSEC,
1658 goto error_close_devices;
1662 btrfs_close_devices(fs_devices);
1663 btrfs_free_fs_info(fs_info);
1664 if ((flags ^ s->s_flags) & SB_RDONLY)
1667 snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev);
1668 btrfs_sb(s)->bdev_holder = fs_type;
1669 if (!strstr(crc32c_impl(), "generic"))
1670 set_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags);
1671 error = btrfs_fill_super(s, fs_devices, data);
1674 error = security_sb_set_mnt_opts(s, new_sec_opts, 0, NULL);
1675 security_free_mnt_opts(&new_sec_opts);
1677 deactivate_locked_super(s);
1678 return ERR_PTR(error);
1681 return dget(s->s_root);
1683 error_close_devices:
1684 btrfs_close_devices(fs_devices);
1686 btrfs_free_fs_info(fs_info);
1688 security_free_mnt_opts(&new_sec_opts);
1689 return ERR_PTR(error);
1693 * Mount function which is called by VFS layer.
1695 * In order to allow mounting a subvolume directly, btrfs uses mount_subtree()
1696 * which needs vfsmount* of device's root (/). This means device's root has to
1697 * be mounted internally in any case.
1700 * 1. Parse subvol id related options for later use in mount_subvol().
1702 * 2. Mount device's root (/) by calling vfs_kern_mount().
1704 * NOTE: vfs_kern_mount() is used by VFS to call btrfs_mount() in the
1705 * first place. In order to avoid calling btrfs_mount() again, we use
1706 * different file_system_type which is not registered to VFS by
1707 * register_filesystem() (btrfs_root_fs_type). As a result,
1708 * btrfs_mount_root() is called. The return value will be used by
1709 * mount_subtree() in mount_subvol().
1711 * 3. Call mount_subvol() to get the dentry of subvolume. Since there is
1712 * "btrfs subvolume set-default", mount_subvol() is called always.
1714 static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
1715 const char *device_name, void *data)
1717 struct vfsmount *mnt_root;
1718 struct dentry *root;
1719 char *subvol_name = NULL;
1720 u64 subvol_objectid = 0;
1723 error = btrfs_parse_subvol_options(data, &subvol_name,
1727 return ERR_PTR(error);
1730 /* mount device's root (/) */
1731 mnt_root = vfs_kern_mount(&btrfs_root_fs_type, flags, device_name, data);
1732 if (PTR_ERR_OR_ZERO(mnt_root) == -EBUSY) {
1733 if (flags & SB_RDONLY) {
1734 mnt_root = vfs_kern_mount(&btrfs_root_fs_type,
1735 flags & ~SB_RDONLY, device_name, data);
1737 mnt_root = vfs_kern_mount(&btrfs_root_fs_type,
1738 flags | SB_RDONLY, device_name, data);
1739 if (IS_ERR(mnt_root)) {
1740 root = ERR_CAST(mnt_root);
1745 down_write(&mnt_root->mnt_sb->s_umount);
1746 error = btrfs_remount(mnt_root->mnt_sb, &flags, NULL);
1747 up_write(&mnt_root->mnt_sb->s_umount);
1749 root = ERR_PTR(error);
1756 if (IS_ERR(mnt_root)) {
1757 root = ERR_CAST(mnt_root);
1762 /* mount_subvol() will free subvol_name and mnt_root */
1763 root = mount_subvol(subvol_name, subvol_objectid, mnt_root);
1769 static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info,
1770 u32 new_pool_size, u32 old_pool_size)
1772 if (new_pool_size == old_pool_size)
1775 fs_info->thread_pool_size = new_pool_size;
1777 btrfs_info(fs_info, "resize thread pool %d -> %d",
1778 old_pool_size, new_pool_size);
1780 btrfs_workqueue_set_max(fs_info->workers, new_pool_size);
1781 btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size);
1782 btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size);
1783 btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size);
1784 btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size);
1785 btrfs_workqueue_set_max(fs_info->endio_meta_write_workers,
1787 btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size);
1788 btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size);
1789 btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size);
1790 btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size);
1791 btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers,
1795 static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info,
1796 unsigned long old_opts, int flags)
1798 if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) &&
1799 (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) ||
1800 (flags & SB_RDONLY))) {
1801 /* wait for any defraggers to finish */
1802 wait_event(fs_info->transaction_wait,
1803 (atomic_read(&fs_info->defrag_running) == 0));
1804 if (flags & SB_RDONLY)
1805 sync_filesystem(fs_info->sb);
1809 static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info,
1810 unsigned long old_opts)
1813 * We need to cleanup all defragable inodes if the autodefragment is
1814 * close or the filesystem is read only.
1816 if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) &&
1817 (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || sb_rdonly(fs_info->sb))) {
1818 btrfs_cleanup_defrag_inodes(fs_info);
1821 /* If we toggled discard async */
1822 if (!btrfs_raw_test_opt(old_opts, DISCARD_ASYNC) &&
1823 btrfs_test_opt(fs_info, DISCARD_ASYNC))
1824 btrfs_discard_resume(fs_info);
1825 else if (btrfs_raw_test_opt(old_opts, DISCARD_ASYNC) &&
1826 !btrfs_test_opt(fs_info, DISCARD_ASYNC))
1827 btrfs_discard_cleanup(fs_info);
1830 static int btrfs_remount(struct super_block *sb, int *flags, char *data)
1832 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
1833 struct btrfs_root *root = fs_info->tree_root;
1834 unsigned old_flags = sb->s_flags;
1835 unsigned long old_opts = fs_info->mount_opt;
1836 unsigned long old_compress_type = fs_info->compress_type;
1837 u64 old_max_inline = fs_info->max_inline;
1838 u32 old_thread_pool_size = fs_info->thread_pool_size;
1839 u32 old_metadata_ratio = fs_info->metadata_ratio;
1842 sync_filesystem(sb);
1843 set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
1846 void *new_sec_opts = NULL;
1848 ret = security_sb_eat_lsm_opts(data, &new_sec_opts);
1850 ret = security_sb_remount(sb, new_sec_opts);
1851 security_free_mnt_opts(&new_sec_opts);
1856 ret = btrfs_parse_options(fs_info, data, *flags);
1860 btrfs_remount_begin(fs_info, old_opts, *flags);
1861 btrfs_resize_thread_pool(fs_info,
1862 fs_info->thread_pool_size, old_thread_pool_size);
1864 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
1867 if (*flags & SB_RDONLY) {
1869 * this also happens on 'umount -rf' or on shutdown, when
1870 * the filesystem is busy.
1872 cancel_work_sync(&fs_info->async_reclaim_work);
1874 btrfs_discard_cleanup(fs_info);
1876 /* wait for the uuid_scan task to finish */
1877 down(&fs_info->uuid_tree_rescan_sem);
1878 /* avoid complains from lockdep et al. */
1879 up(&fs_info->uuid_tree_rescan_sem);
1881 sb->s_flags |= SB_RDONLY;
1884 * Setting SB_RDONLY will put the cleaner thread to
1885 * sleep at the next loop if it's already active.
1886 * If it's already asleep, we'll leave unused block
1887 * groups on disk until we're mounted read-write again
1888 * unless we clean them up here.
1890 btrfs_delete_unused_bgs(fs_info);
1892 btrfs_dev_replace_suspend_for_unmount(fs_info);
1893 btrfs_scrub_cancel(fs_info);
1894 btrfs_pause_balance(fs_info);
1896 ret = btrfs_commit_super(fs_info);
1900 if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
1902 "Remounting read-write after error is not allowed");
1906 if (fs_info->fs_devices->rw_devices == 0) {
1911 if (!btrfs_check_rw_degradable(fs_info, NULL)) {
1913 "too many missing devices, writable remount is not allowed");
1918 if (btrfs_super_log_root(fs_info->super_copy) != 0) {
1920 "mount required to replay tree-log, cannot remount read-write");
1925 ret = btrfs_cleanup_fs_roots(fs_info);
1929 /* recover relocation */
1930 mutex_lock(&fs_info->cleaner_mutex);
1931 ret = btrfs_recover_relocation(root);
1932 mutex_unlock(&fs_info->cleaner_mutex);
1936 ret = btrfs_resume_balance_async(fs_info);
1940 ret = btrfs_resume_dev_replace_async(fs_info);
1942 btrfs_warn(fs_info, "failed to resume dev_replace");
1946 btrfs_qgroup_rescan_resume(fs_info);
1948 if (!fs_info->uuid_root) {
1949 btrfs_info(fs_info, "creating UUID tree");
1950 ret = btrfs_create_uuid_tree(fs_info);
1953 "failed to create the UUID tree %d",
1958 sb->s_flags &= ~SB_RDONLY;
1960 set_bit(BTRFS_FS_OPEN, &fs_info->flags);
1963 wake_up_process(fs_info->transaction_kthread);
1964 btrfs_remount_cleanup(fs_info, old_opts);
1965 clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
1970 /* We've hit an error - don't reset SB_RDONLY */
1972 old_flags |= SB_RDONLY;
1973 sb->s_flags = old_flags;
1974 fs_info->mount_opt = old_opts;
1975 fs_info->compress_type = old_compress_type;
1976 fs_info->max_inline = old_max_inline;
1977 btrfs_resize_thread_pool(fs_info,
1978 old_thread_pool_size, fs_info->thread_pool_size);
1979 fs_info->metadata_ratio = old_metadata_ratio;
1980 btrfs_remount_cleanup(fs_info, old_opts);
1981 clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
1986 /* Used to sort the devices by max_avail(descending sort) */
1987 static inline int btrfs_cmp_device_free_bytes(const void *dev_info1,
1988 const void *dev_info2)
1990 if (((struct btrfs_device_info *)dev_info1)->max_avail >
1991 ((struct btrfs_device_info *)dev_info2)->max_avail)
1993 else if (((struct btrfs_device_info *)dev_info1)->max_avail <
1994 ((struct btrfs_device_info *)dev_info2)->max_avail)
2001 * sort the devices by max_avail, in which max free extent size of each device
2002 * is stored.(Descending Sort)
2004 static inline void btrfs_descending_sort_devices(
2005 struct btrfs_device_info *devices,
2008 sort(devices, nr_devices, sizeof(struct btrfs_device_info),
2009 btrfs_cmp_device_free_bytes, NULL);
2013 * The helper to calc the free space on the devices that can be used to store
2016 static inline int btrfs_calc_avail_data_space(struct btrfs_fs_info *fs_info,
2019 struct btrfs_device_info *devices_info;
2020 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
2021 struct btrfs_device *device;
2024 u64 min_stripe_size;
2025 int num_stripes = 1;
2026 int i = 0, nr_devices;
2027 const struct btrfs_raid_attr *rattr;
2030 * We aren't under the device list lock, so this is racy-ish, but good
2031 * enough for our purposes.
2033 nr_devices = fs_info->fs_devices->open_devices;
2036 nr_devices = fs_info->fs_devices->open_devices;
2044 devices_info = kmalloc_array(nr_devices, sizeof(*devices_info),
2049 /* calc min stripe number for data space allocation */
2050 type = btrfs_data_alloc_profile(fs_info);
2051 rattr = &btrfs_raid_array[btrfs_bg_flags_to_raid_index(type)];
2053 if (type & BTRFS_BLOCK_GROUP_RAID0)
2054 num_stripes = nr_devices;
2055 else if (type & BTRFS_BLOCK_GROUP_RAID1)
2057 else if (type & BTRFS_BLOCK_GROUP_RAID1C3)
2059 else if (type & BTRFS_BLOCK_GROUP_RAID1C4)
2061 else if (type & BTRFS_BLOCK_GROUP_RAID10)
2064 /* Adjust for more than 1 stripe per device */
2065 min_stripe_size = rattr->dev_stripes * BTRFS_STRIPE_LEN;
2068 list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
2069 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA,
2070 &device->dev_state) ||
2072 test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state))
2075 if (i >= nr_devices)
2078 avail_space = device->total_bytes - device->bytes_used;
2080 /* align with stripe_len */
2081 avail_space = rounddown(avail_space, BTRFS_STRIPE_LEN);
2084 * In order to avoid overwriting the superblock on the drive,
2085 * btrfs starts at an offset of at least 1MB when doing chunk
2088 * This ensures we have at least min_stripe_size free space
2089 * after excluding 1MB.
2091 if (avail_space <= SZ_1M + min_stripe_size)
2094 avail_space -= SZ_1M;
2096 devices_info[i].dev = device;
2097 devices_info[i].max_avail = avail_space;
2105 btrfs_descending_sort_devices(devices_info, nr_devices);
2109 while (nr_devices >= rattr->devs_min) {
2110 num_stripes = min(num_stripes, nr_devices);
2112 if (devices_info[i].max_avail >= min_stripe_size) {
2116 avail_space += devices_info[i].max_avail * num_stripes;
2117 alloc_size = devices_info[i].max_avail;
2118 for (j = i + 1 - num_stripes; j <= i; j++)
2119 devices_info[j].max_avail -= alloc_size;
2125 kfree(devices_info);
2126 *free_bytes = avail_space;
2131 * Calculate numbers for 'df', pessimistic in case of mixed raid profiles.
2133 * If there's a redundant raid level at DATA block groups, use the respective
2134 * multiplier to scale the sizes.
2136 * Unused device space usage is based on simulating the chunk allocator
2137 * algorithm that respects the device sizes and order of allocations. This is
2138 * a close approximation of the actual use but there are other factors that may
2139 * change the result (like a new metadata chunk).
2141 * If metadata is exhausted, f_bavail will be 0.
2143 static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2145 struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb);
2146 struct btrfs_super_block *disk_super = fs_info->super_copy;
2147 struct btrfs_space_info *found;
2149 u64 total_free_data = 0;
2150 u64 total_free_meta = 0;
2151 int bits = dentry->d_sb->s_blocksize_bits;
2152 __be32 *fsid = (__be32 *)fs_info->fs_devices->fsid;
2153 unsigned factor = 1;
2154 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
2160 list_for_each_entry_rcu(found, &fs_info->space_info, list) {
2161 if (found->flags & BTRFS_BLOCK_GROUP_DATA) {
2164 total_free_data += found->disk_total - found->disk_used;
2166 btrfs_account_ro_block_groups_free_space(found);
2168 for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
2169 if (!list_empty(&found->block_groups[i]))
2170 factor = btrfs_bg_type_to_factor(
2171 btrfs_raid_array[i].bg_flag);
2176 * Metadata in mixed block goup profiles are accounted in data
2178 if (!mixed && found->flags & BTRFS_BLOCK_GROUP_METADATA) {
2179 if (found->flags & BTRFS_BLOCK_GROUP_DATA)
2182 total_free_meta += found->disk_total -
2186 total_used += found->disk_used;
2191 buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor);
2192 buf->f_blocks >>= bits;
2193 buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits);
2195 /* Account global block reserve as used, it's in logical size already */
2196 spin_lock(&block_rsv->lock);
2197 /* Mixed block groups accounting is not byte-accurate, avoid overflow */
2198 if (buf->f_bfree >= block_rsv->size >> bits)
2199 buf->f_bfree -= block_rsv->size >> bits;
2202 spin_unlock(&block_rsv->lock);
2204 buf->f_bavail = div_u64(total_free_data, factor);
2205 ret = btrfs_calc_avail_data_space(fs_info, &total_free_data);
2208 buf->f_bavail += div_u64(total_free_data, factor);
2209 buf->f_bavail = buf->f_bavail >> bits;
2212 * We calculate the remaining metadata space minus global reserve. If
2213 * this is (supposedly) smaller than zero, there's no space. But this
2214 * does not hold in practice, the exhausted state happens where's still
2215 * some positive delta. So we apply some guesswork and compare the
2216 * delta to a 4M threshold. (Practically observed delta was ~2M.)
2218 * We probably cannot calculate the exact threshold value because this
2219 * depends on the internal reservations requested by various
2220 * operations, so some operations that consume a few metadata will
2221 * succeed even if the Avail is zero. But this is better than the other
2227 * We only want to claim there's no available space if we can no longer
2228 * allocate chunks for our metadata profile and our global reserve will
2229 * not fit in the free metadata space. If we aren't ->full then we
2230 * still can allocate chunks and thus are fine using the currently
2231 * calculated f_bavail.
2233 if (!mixed && block_rsv->space_info->full &&
2234 total_free_meta - thresh < block_rsv->size)
2237 buf->f_type = BTRFS_SUPER_MAGIC;
2238 buf->f_bsize = dentry->d_sb->s_blocksize;
2239 buf->f_namelen = BTRFS_NAME_LEN;
2241 /* We treat it as constant endianness (it doesn't matter _which_)
2242 because we want the fsid to come out the same whether mounted
2243 on a big-endian or little-endian host */
2244 buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]);
2245 buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]);
2246 /* Mask in the root object ID too, to disambiguate subvols */
2247 buf->f_fsid.val[0] ^=
2248 BTRFS_I(d_inode(dentry))->root->root_key.objectid >> 32;
2249 buf->f_fsid.val[1] ^=
2250 BTRFS_I(d_inode(dentry))->root->root_key.objectid;
2255 static void btrfs_kill_super(struct super_block *sb)
2257 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
2258 kill_anon_super(sb);
2259 btrfs_free_fs_info(fs_info);
2262 static struct file_system_type btrfs_fs_type = {
2263 .owner = THIS_MODULE,
2265 .mount = btrfs_mount,
2266 .kill_sb = btrfs_kill_super,
2267 .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA,
2270 static struct file_system_type btrfs_root_fs_type = {
2271 .owner = THIS_MODULE,
2273 .mount = btrfs_mount_root,
2274 .kill_sb = btrfs_kill_super,
2275 .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA,
2278 MODULE_ALIAS_FS("btrfs");
2280 static int btrfs_control_open(struct inode *inode, struct file *file)
2283 * The control file's private_data is used to hold the
2284 * transaction when it is started and is used to keep
2285 * track of whether a transaction is already in progress.
2287 file->private_data = NULL;
2292 * Used by /dev/btrfs-control for devices ioctls.
2294 static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
2297 struct btrfs_ioctl_vol_args *vol;
2298 struct btrfs_device *device = NULL;
2301 if (!capable(CAP_SYS_ADMIN))
2304 vol = memdup_user((void __user *)arg, sizeof(*vol));
2306 return PTR_ERR(vol);
2307 vol->name[BTRFS_PATH_NAME_MAX] = '\0';
2310 case BTRFS_IOC_SCAN_DEV:
2311 mutex_lock(&uuid_mutex);
2312 device = btrfs_scan_one_device(vol->name, FMODE_READ,
2313 &btrfs_root_fs_type);
2314 ret = PTR_ERR_OR_ZERO(device);
2315 mutex_unlock(&uuid_mutex);
2317 case BTRFS_IOC_FORGET_DEV:
2318 ret = btrfs_forget_devices(vol->name);
2320 case BTRFS_IOC_DEVICES_READY:
2321 mutex_lock(&uuid_mutex);
2322 device = btrfs_scan_one_device(vol->name, FMODE_READ,
2323 &btrfs_root_fs_type);
2324 if (IS_ERR(device)) {
2325 mutex_unlock(&uuid_mutex);
2326 ret = PTR_ERR(device);
2329 ret = !(device->fs_devices->num_devices ==
2330 device->fs_devices->total_devices);
2331 mutex_unlock(&uuid_mutex);
2333 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
2334 ret = btrfs_ioctl_get_supported_features((void __user*)arg);
2342 static int btrfs_freeze(struct super_block *sb)
2344 struct btrfs_trans_handle *trans;
2345 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
2346 struct btrfs_root *root = fs_info->tree_root;
2348 set_bit(BTRFS_FS_FROZEN, &fs_info->flags);
2350 * We don't need a barrier here, we'll wait for any transaction that
2351 * could be in progress on other threads (and do delayed iputs that
2352 * we want to avoid on a frozen filesystem), or do the commit
2355 trans = btrfs_attach_transaction_barrier(root);
2356 if (IS_ERR(trans)) {
2357 /* no transaction, don't bother */
2358 if (PTR_ERR(trans) == -ENOENT)
2360 return PTR_ERR(trans);
2362 return btrfs_commit_transaction(trans);
2365 static int btrfs_unfreeze(struct super_block *sb)
2367 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
2369 clear_bit(BTRFS_FS_FROZEN, &fs_info->flags);
2373 static int btrfs_show_devname(struct seq_file *m, struct dentry *root)
2375 struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb);
2376 struct btrfs_device *dev, *first_dev = NULL;
2379 * Lightweight locking of the devices. We should not need
2380 * device_list_mutex here as we only read the device data and the list
2381 * is protected by RCU. Even if a device is deleted during the list
2382 * traversals, we'll get valid data, the freeing callback will wait at
2383 * least until the rcu_read_unlock.
2386 list_for_each_entry_rcu(dev, &fs_info->fs_devices->devices, dev_list) {
2387 if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
2391 if (!first_dev || dev->devid < first_dev->devid)
2396 seq_escape(m, rcu_str_deref(first_dev->name), " \t\n\\");
2403 static const struct super_operations btrfs_super_ops = {
2404 .drop_inode = btrfs_drop_inode,
2405 .evict_inode = btrfs_evict_inode,
2406 .put_super = btrfs_put_super,
2407 .sync_fs = btrfs_sync_fs,
2408 .show_options = btrfs_show_options,
2409 .show_devname = btrfs_show_devname,
2410 .alloc_inode = btrfs_alloc_inode,
2411 .destroy_inode = btrfs_destroy_inode,
2412 .free_inode = btrfs_free_inode,
2413 .statfs = btrfs_statfs,
2414 .remount_fs = btrfs_remount,
2415 .freeze_fs = btrfs_freeze,
2416 .unfreeze_fs = btrfs_unfreeze,
2419 static const struct file_operations btrfs_ctl_fops = {
2420 .open = btrfs_control_open,
2421 .unlocked_ioctl = btrfs_control_ioctl,
2422 .compat_ioctl = compat_ptr_ioctl,
2423 .owner = THIS_MODULE,
2424 .llseek = noop_llseek,
2427 static struct miscdevice btrfs_misc = {
2428 .minor = BTRFS_MINOR,
2429 .name = "btrfs-control",
2430 .fops = &btrfs_ctl_fops
2433 MODULE_ALIAS_MISCDEV(BTRFS_MINOR);
2434 MODULE_ALIAS("devname:btrfs-control");
2436 static int __init btrfs_interface_init(void)
2438 return misc_register(&btrfs_misc);
2441 static __cold void btrfs_interface_exit(void)
2443 misc_deregister(&btrfs_misc);
2446 static void __init btrfs_print_mod_info(void)
2448 static const char options[] = ""
2449 #ifdef CONFIG_BTRFS_DEBUG
2452 #ifdef CONFIG_BTRFS_ASSERT
2455 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
2456 ", integrity-checker=on"
2458 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
2462 pr_info("Btrfs loaded, crc32c=%s%s\n", crc32c_impl(), options);
2465 static int __init init_btrfs_fs(void)
2471 err = btrfs_init_sysfs();
2475 btrfs_init_compress();
2477 err = btrfs_init_cachep();
2481 err = extent_io_init();
2485 err = extent_state_cache_init();
2487 goto free_extent_io;
2489 err = extent_map_init();
2491 goto free_extent_state_cache;
2493 err = ordered_data_init();
2495 goto free_extent_map;
2497 err = btrfs_delayed_inode_init();
2499 goto free_ordered_data;
2501 err = btrfs_auto_defrag_init();
2503 goto free_delayed_inode;
2505 err = btrfs_delayed_ref_init();
2507 goto free_auto_defrag;
2509 err = btrfs_prelim_ref_init();
2511 goto free_delayed_ref;
2513 err = btrfs_end_io_wq_init();
2515 goto free_prelim_ref;
2517 err = btrfs_interface_init();
2519 goto free_end_io_wq;
2521 btrfs_init_lockdep();
2523 btrfs_print_mod_info();
2525 err = btrfs_run_sanity_tests();
2527 goto unregister_ioctl;
2529 err = register_filesystem(&btrfs_fs_type);
2531 goto unregister_ioctl;
2536 btrfs_interface_exit();
2538 btrfs_end_io_wq_exit();
2540 btrfs_prelim_ref_exit();
2542 btrfs_delayed_ref_exit();
2544 btrfs_auto_defrag_exit();
2546 btrfs_delayed_inode_exit();
2548 ordered_data_exit();
2551 free_extent_state_cache:
2552 extent_state_cache_exit();
2556 btrfs_destroy_cachep();
2558 btrfs_exit_compress();
2564 static void __exit exit_btrfs_fs(void)
2566 btrfs_destroy_cachep();
2567 btrfs_delayed_ref_exit();
2568 btrfs_auto_defrag_exit();
2569 btrfs_delayed_inode_exit();
2570 btrfs_prelim_ref_exit();
2571 ordered_data_exit();
2573 extent_state_cache_exit();
2575 btrfs_interface_exit();
2576 btrfs_end_io_wq_exit();
2577 unregister_filesystem(&btrfs_fs_type);
2579 btrfs_cleanup_fs_uuids();
2580 btrfs_exit_compress();
2583 late_initcall(init_btrfs_fs);
2584 module_exit(exit_btrfs_fs)
2586 MODULE_LICENSE("GPL");
2587 MODULE_SOFTDEP("pre: crc32c");
2588 MODULE_SOFTDEP("pre: xxhash64");
2589 MODULE_SOFTDEP("pre: sha256");
2590 MODULE_SOFTDEP("pre: blake2b-256");