2 * Copyright (C) 2007 Oracle. All rights reserved.
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.
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.
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.
19 #include <linux/blkdev.h>
20 #include <linux/module.h>
21 #include <linux/buffer_head.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"
48 #include "transaction.h"
49 #include "btrfs_inode.h"
50 #include "print-tree.h"
56 #include "compression.h"
57 #include "rcu-string.h"
58 #include "dev-replace.h"
59 #include "free-space-cache.h"
62 #include "tests/btrfs-tests.h"
65 #define CREATE_TRACE_POINTS
66 #include <trace/events/btrfs.h>
68 static const struct super_operations btrfs_super_ops
;
69 static struct file_system_type btrfs_fs_type
;
71 static int btrfs_remount(struct super_block
*sb
, int *flags
, char *data
);
73 const char *btrfs_decode_error(int errno
)
75 char *errstr
= "unknown";
79 errstr
= "IO failure";
82 errstr
= "Out of memory";
85 errstr
= "Readonly filesystem";
88 errstr
= "Object already exists";
91 errstr
= "No space left";
94 errstr
= "No such entry";
101 static void save_error_info(struct btrfs_fs_info
*fs_info
)
104 * today we only save the error info into ram. Long term we'll
105 * also send it down to the disk
107 set_bit(BTRFS_FS_STATE_ERROR
, &fs_info
->fs_state
);
110 /* btrfs handle error by forcing the filesystem readonly */
111 static void btrfs_handle_error(struct btrfs_fs_info
*fs_info
)
113 struct super_block
*sb
= fs_info
->sb
;
115 if (sb
->s_flags
& MS_RDONLY
)
118 if (test_bit(BTRFS_FS_STATE_ERROR
, &fs_info
->fs_state
)) {
119 sb
->s_flags
|= MS_RDONLY
;
120 btrfs_info(fs_info
, "forced readonly");
122 * Note that a running device replace operation is not
123 * canceled here although there is no way to update
124 * the progress. It would add the risk of a deadlock,
125 * therefore the canceling is ommited. The only penalty
126 * is that some I/O remains active until the procedure
127 * completes. The next time when the filesystem is
128 * mounted writeable again, the device replace
129 * operation continues.
135 * __btrfs_std_error decodes expected errors from the caller and
136 * invokes the approciate error response.
139 void __btrfs_std_error(struct btrfs_fs_info
*fs_info
, const char *function
,
140 unsigned int line
, int errno
, const char *fmt
, ...)
142 struct super_block
*sb
= fs_info
->sb
;
148 * Special case: if the error is EROFS, and we're already
149 * under MS_RDONLY, then it is safe here.
151 if (errno
== -EROFS
&& (sb
->s_flags
& MS_RDONLY
))
155 errstr
= btrfs_decode_error(errno
);
157 struct va_format vaf
;
165 "BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n",
166 sb
->s_id
, function
, line
, errno
, errstr
, &vaf
);
169 printk(KERN_CRIT
"BTRFS: error (device %s) in %s:%d: errno=%d %s\n",
170 sb
->s_id
, function
, line
, errno
, errstr
);
174 /* Don't go through full error handling during mount */
175 save_error_info(fs_info
);
176 if (sb
->s_flags
& MS_BORN
)
177 btrfs_handle_error(fs_info
);
181 static const char * const logtypes
[] = {
192 void btrfs_printk(const struct btrfs_fs_info
*fs_info
, const char *fmt
, ...)
194 struct super_block
*sb
= fs_info
->sb
;
196 struct va_format vaf
;
198 const char *type
= logtypes
[4];
203 kern_level
= printk_get_level(fmt
);
205 size_t size
= printk_skip_level(fmt
) - fmt
;
206 memcpy(lvl
, fmt
, size
);
209 type
= logtypes
[kern_level
- '0'];
216 printk("%sBTRFS %s (device %s): %pV\n", lvl
, type
, sb
->s_id
, &vaf
);
223 * We only mark the transaction aborted and then set the file system read-only.
224 * This will prevent new transactions from starting or trying to join this
227 * This means that error recovery at the call site is limited to freeing
228 * any local memory allocations and passing the error code up without
229 * further cleanup. The transaction should complete as it normally would
230 * in the call path but will return -EIO.
232 * We'll complete the cleanup in btrfs_end_transaction and
233 * btrfs_commit_transaction.
236 void __btrfs_abort_transaction(struct btrfs_trans_handle
*trans
,
237 struct btrfs_root
*root
, const char *function
,
238 unsigned int line
, int errno
)
240 trans
->aborted
= errno
;
241 /* Nothing used. The other threads that have joined this
242 * transaction may be able to continue. */
243 if (!trans
->blocks_used
&& list_empty(&trans
->new_bgs
)) {
246 errstr
= btrfs_decode_error(errno
);
247 btrfs_warn(root
->fs_info
,
248 "%s:%d: Aborting unused transaction(%s).",
249 function
, line
, errstr
);
252 ACCESS_ONCE(trans
->transaction
->aborted
) = errno
;
253 /* Wake up anybody who may be waiting on this transaction */
254 wake_up(&root
->fs_info
->transaction_wait
);
255 wake_up(&root
->fs_info
->transaction_blocked_wait
);
256 __btrfs_std_error(root
->fs_info
, function
, line
, errno
, NULL
);
259 * __btrfs_panic decodes unexpected, fatal errors from the caller,
260 * issues an alert, and either panics or BUGs, depending on mount options.
263 void __btrfs_panic(struct btrfs_fs_info
*fs_info
, const char *function
,
264 unsigned int line
, int errno
, const char *fmt
, ...)
266 char *s_id
= "<unknown>";
268 struct va_format vaf
= { .fmt
= fmt
};
272 s_id
= fs_info
->sb
->s_id
;
277 errstr
= btrfs_decode_error(errno
);
278 if (fs_info
&& (fs_info
->mount_opt
& BTRFS_MOUNT_PANIC_ON_FATAL_ERROR
))
279 panic(KERN_CRIT
"BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n",
280 s_id
, function
, line
, &vaf
, errno
, errstr
);
282 btrfs_crit(fs_info
, "panic in %s:%d: %pV (errno=%d %s)",
283 function
, line
, &vaf
, errno
, errstr
);
285 /* Caller calls BUG() */
288 static void btrfs_put_super(struct super_block
*sb
)
290 close_ctree(btrfs_sb(sb
)->tree_root
);
294 Opt_degraded
, Opt_subvol
, Opt_subvolid
, Opt_device
, Opt_nodatasum
,
295 Opt_nodatacow
, Opt_max_inline
, Opt_alloc_start
, Opt_nobarrier
, Opt_ssd
,
296 Opt_nossd
, Opt_ssd_spread
, Opt_thread_pool
, Opt_noacl
, Opt_compress
,
297 Opt_compress_type
, Opt_compress_force
, Opt_compress_force_type
,
298 Opt_notreelog
, Opt_ratio
, Opt_flushoncommit
, Opt_discard
,
299 Opt_space_cache
, Opt_space_cache_version
, Opt_clear_cache
,
300 Opt_user_subvol_rm_allowed
, Opt_enospc_debug
, Opt_subvolrootid
,
301 Opt_defrag
, Opt_inode_cache
, Opt_no_space_cache
, Opt_recovery
,
302 Opt_skip_balance
, Opt_check_integrity
,
303 Opt_check_integrity_including_extent_data
,
304 Opt_check_integrity_print_mask
, Opt_fatal_errors
, Opt_rescan_uuid_tree
,
305 Opt_commit_interval
, Opt_barrier
, Opt_nodefrag
, Opt_nodiscard
,
306 Opt_noenospc_debug
, Opt_noflushoncommit
, Opt_acl
, Opt_datacow
,
307 Opt_datasum
, Opt_treelog
, Opt_noinode_cache
,
308 #ifdef CONFIG_BTRFS_DEBUG
309 Opt_fragment_data
, Opt_fragment_metadata
, Opt_fragment_all
,
314 static const match_table_t tokens
= {
315 {Opt_degraded
, "degraded"},
316 {Opt_subvol
, "subvol=%s"},
317 {Opt_subvolid
, "subvolid=%s"},
318 {Opt_device
, "device=%s"},
319 {Opt_nodatasum
, "nodatasum"},
320 {Opt_datasum
, "datasum"},
321 {Opt_nodatacow
, "nodatacow"},
322 {Opt_datacow
, "datacow"},
323 {Opt_nobarrier
, "nobarrier"},
324 {Opt_barrier
, "barrier"},
325 {Opt_max_inline
, "max_inline=%s"},
326 {Opt_alloc_start
, "alloc_start=%s"},
327 {Opt_thread_pool
, "thread_pool=%d"},
328 {Opt_compress
, "compress"},
329 {Opt_compress_type
, "compress=%s"},
330 {Opt_compress_force
, "compress-force"},
331 {Opt_compress_force_type
, "compress-force=%s"},
333 {Opt_ssd_spread
, "ssd_spread"},
334 {Opt_nossd
, "nossd"},
336 {Opt_noacl
, "noacl"},
337 {Opt_notreelog
, "notreelog"},
338 {Opt_treelog
, "treelog"},
339 {Opt_flushoncommit
, "flushoncommit"},
340 {Opt_noflushoncommit
, "noflushoncommit"},
341 {Opt_ratio
, "metadata_ratio=%d"},
342 {Opt_discard
, "discard"},
343 {Opt_nodiscard
, "nodiscard"},
344 {Opt_space_cache
, "space_cache"},
345 {Opt_space_cache_version
, "space_cache=%s"},
346 {Opt_clear_cache
, "clear_cache"},
347 {Opt_user_subvol_rm_allowed
, "user_subvol_rm_allowed"},
348 {Opt_enospc_debug
, "enospc_debug"},
349 {Opt_noenospc_debug
, "noenospc_debug"},
350 {Opt_subvolrootid
, "subvolrootid=%d"},
351 {Opt_defrag
, "autodefrag"},
352 {Opt_nodefrag
, "noautodefrag"},
353 {Opt_inode_cache
, "inode_cache"},
354 {Opt_noinode_cache
, "noinode_cache"},
355 {Opt_no_space_cache
, "nospace_cache"},
356 {Opt_recovery
, "recovery"},
357 {Opt_skip_balance
, "skip_balance"},
358 {Opt_check_integrity
, "check_int"},
359 {Opt_check_integrity_including_extent_data
, "check_int_data"},
360 {Opt_check_integrity_print_mask
, "check_int_print_mask=%d"},
361 {Opt_rescan_uuid_tree
, "rescan_uuid_tree"},
362 {Opt_fatal_errors
, "fatal_errors=%s"},
363 {Opt_commit_interval
, "commit=%d"},
364 #ifdef CONFIG_BTRFS_DEBUG
365 {Opt_fragment_data
, "fragment=data"},
366 {Opt_fragment_metadata
, "fragment=metadata"},
367 {Opt_fragment_all
, "fragment=all"},
373 * Regular mount options parser. Everything that is needed only when
374 * reading in a new superblock is parsed here.
375 * XXX JDM: This needs to be cleaned up for remount.
377 int btrfs_parse_options(struct btrfs_root
*root
, char *options
)
379 struct btrfs_fs_info
*info
= root
->fs_info
;
380 substring_t args
[MAX_OPT_ARGS
];
381 char *p
, *num
, *orig
= NULL
;
386 bool compress_force
= false;
388 cache_gen
= btrfs_super_cache_generation(root
->fs_info
->super_copy
);
389 if (btrfs_fs_compat_ro(root
->fs_info
, FREE_SPACE_TREE
))
390 btrfs_set_opt(info
->mount_opt
, FREE_SPACE_TREE
);
392 btrfs_set_opt(info
->mount_opt
, SPACE_CACHE
);
398 * strsep changes the string, duplicate it because parse_options
401 options
= kstrdup(options
, GFP_NOFS
);
407 while ((p
= strsep(&options
, ",")) != NULL
) {
412 token
= match_token(p
, tokens
, args
);
415 btrfs_info(root
->fs_info
, "allowing degraded mounts");
416 btrfs_set_opt(info
->mount_opt
, DEGRADED
);
420 case Opt_subvolrootid
:
423 * These are parsed by btrfs_parse_early_options
424 * and can be happily ignored here.
428 btrfs_set_and_info(root
, NODATASUM
,
429 "setting nodatasum");
432 if (btrfs_test_opt(root
, NODATASUM
)) {
433 if (btrfs_test_opt(root
, NODATACOW
))
434 btrfs_info(root
->fs_info
, "setting datasum, datacow enabled");
436 btrfs_info(root
->fs_info
, "setting datasum");
438 btrfs_clear_opt(info
->mount_opt
, NODATACOW
);
439 btrfs_clear_opt(info
->mount_opt
, NODATASUM
);
442 if (!btrfs_test_opt(root
, NODATACOW
)) {
443 if (!btrfs_test_opt(root
, COMPRESS
) ||
444 !btrfs_test_opt(root
, FORCE_COMPRESS
)) {
445 btrfs_info(root
->fs_info
,
446 "setting nodatacow, compression disabled");
448 btrfs_info(root
->fs_info
, "setting nodatacow");
451 btrfs_clear_opt(info
->mount_opt
, COMPRESS
);
452 btrfs_clear_opt(info
->mount_opt
, FORCE_COMPRESS
);
453 btrfs_set_opt(info
->mount_opt
, NODATACOW
);
454 btrfs_set_opt(info
->mount_opt
, NODATASUM
);
457 btrfs_clear_and_info(root
, NODATACOW
,
460 case Opt_compress_force
:
461 case Opt_compress_force_type
:
462 compress_force
= true;
465 case Opt_compress_type
:
466 if (token
== Opt_compress
||
467 token
== Opt_compress_force
||
468 strcmp(args
[0].from
, "zlib") == 0) {
469 compress_type
= "zlib";
470 info
->compress_type
= BTRFS_COMPRESS_ZLIB
;
471 btrfs_set_opt(info
->mount_opt
, COMPRESS
);
472 btrfs_clear_opt(info
->mount_opt
, NODATACOW
);
473 btrfs_clear_opt(info
->mount_opt
, NODATASUM
);
474 } else if (strcmp(args
[0].from
, "lzo") == 0) {
475 compress_type
= "lzo";
476 info
->compress_type
= BTRFS_COMPRESS_LZO
;
477 btrfs_set_opt(info
->mount_opt
, COMPRESS
);
478 btrfs_clear_opt(info
->mount_opt
, NODATACOW
);
479 btrfs_clear_opt(info
->mount_opt
, NODATASUM
);
480 btrfs_set_fs_incompat(info
, COMPRESS_LZO
);
481 btrfs_sysfs_feature_update(root
->fs_info
,
482 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO
,
484 } else if (strncmp(args
[0].from
, "no", 2) == 0) {
485 compress_type
= "no";
486 btrfs_clear_opt(info
->mount_opt
, COMPRESS
);
487 btrfs_clear_opt(info
->mount_opt
, FORCE_COMPRESS
);
488 compress_force
= false;
494 if (compress_force
) {
495 btrfs_set_and_info(root
, FORCE_COMPRESS
,
496 "force %s compression",
499 if (!btrfs_test_opt(root
, COMPRESS
))
500 btrfs_info(root
->fs_info
,
501 "btrfs: use %s compression",
504 * If we remount from compress-force=xxx to
505 * compress=xxx, we need clear FORCE_COMPRESS
506 * flag, otherwise, there is no way for users
507 * to disable forcible compression separately.
509 btrfs_clear_opt(info
->mount_opt
, FORCE_COMPRESS
);
513 btrfs_set_and_info(root
, SSD
,
514 "use ssd allocation scheme");
517 btrfs_set_and_info(root
, SSD_SPREAD
,
518 "use spread ssd allocation scheme");
519 btrfs_set_opt(info
->mount_opt
, SSD
);
522 btrfs_set_and_info(root
, NOSSD
,
523 "not using ssd allocation scheme");
524 btrfs_clear_opt(info
->mount_opt
, SSD
);
527 btrfs_clear_and_info(root
, NOBARRIER
,
528 "turning on barriers");
531 btrfs_set_and_info(root
, NOBARRIER
,
532 "turning off barriers");
534 case Opt_thread_pool
:
535 ret
= match_int(&args
[0], &intarg
);
538 } else if (intarg
> 0) {
539 info
->thread_pool_size
= intarg
;
546 num
= match_strdup(&args
[0]);
548 info
->max_inline
= memparse(num
, NULL
);
551 if (info
->max_inline
) {
552 info
->max_inline
= min_t(u64
,
556 btrfs_info(root
->fs_info
, "max_inline at %llu",
563 case Opt_alloc_start
:
564 num
= match_strdup(&args
[0]);
566 mutex_lock(&info
->chunk_mutex
);
567 info
->alloc_start
= memparse(num
, NULL
);
568 mutex_unlock(&info
->chunk_mutex
);
570 btrfs_info(root
->fs_info
, "allocations start at %llu",
578 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
579 root
->fs_info
->sb
->s_flags
|= MS_POSIXACL
;
582 btrfs_err(root
->fs_info
,
583 "support for ACL not compiled in!");
588 root
->fs_info
->sb
->s_flags
&= ~MS_POSIXACL
;
591 btrfs_set_and_info(root
, NOTREELOG
,
592 "disabling tree log");
595 btrfs_clear_and_info(root
, NOTREELOG
,
596 "enabling tree log");
598 case Opt_flushoncommit
:
599 btrfs_set_and_info(root
, FLUSHONCOMMIT
,
600 "turning on flush-on-commit");
602 case Opt_noflushoncommit
:
603 btrfs_clear_and_info(root
, FLUSHONCOMMIT
,
604 "turning off flush-on-commit");
607 ret
= match_int(&args
[0], &intarg
);
610 } else if (intarg
>= 0) {
611 info
->metadata_ratio
= intarg
;
612 btrfs_info(root
->fs_info
, "metadata ratio %d",
613 info
->metadata_ratio
);
620 btrfs_set_and_info(root
, DISCARD
,
621 "turning on discard");
624 btrfs_clear_and_info(root
, DISCARD
,
625 "turning off discard");
627 case Opt_space_cache
:
628 case Opt_space_cache_version
:
629 if (token
== Opt_space_cache
||
630 strcmp(args
[0].from
, "v1") == 0) {
631 btrfs_clear_opt(root
->fs_info
->mount_opt
,
633 btrfs_set_and_info(root
, SPACE_CACHE
,
634 "enabling disk space caching");
635 } else if (strcmp(args
[0].from
, "v2") == 0) {
636 btrfs_clear_opt(root
->fs_info
->mount_opt
,
638 btrfs_set_and_info(root
, FREE_SPACE_TREE
,
639 "enabling free space tree");
645 case Opt_rescan_uuid_tree
:
646 btrfs_set_opt(info
->mount_opt
, RESCAN_UUID_TREE
);
648 case Opt_no_space_cache
:
649 if (btrfs_test_opt(root
, SPACE_CACHE
)) {
650 btrfs_clear_and_info(root
, SPACE_CACHE
,
651 "disabling disk space caching");
653 if (btrfs_test_opt(root
, FREE_SPACE_TREE
)) {
654 btrfs_clear_and_info(root
, FREE_SPACE_TREE
,
655 "disabling free space tree");
658 case Opt_inode_cache
:
659 btrfs_set_pending_and_info(info
, INODE_MAP_CACHE
,
660 "enabling inode map caching");
662 case Opt_noinode_cache
:
663 btrfs_clear_pending_and_info(info
, INODE_MAP_CACHE
,
664 "disabling inode map caching");
666 case Opt_clear_cache
:
667 btrfs_set_and_info(root
, CLEAR_CACHE
,
668 "force clearing of disk cache");
670 case Opt_user_subvol_rm_allowed
:
671 btrfs_set_opt(info
->mount_opt
, USER_SUBVOL_RM_ALLOWED
);
673 case Opt_enospc_debug
:
674 btrfs_set_opt(info
->mount_opt
, ENOSPC_DEBUG
);
676 case Opt_noenospc_debug
:
677 btrfs_clear_opt(info
->mount_opt
, ENOSPC_DEBUG
);
680 btrfs_set_and_info(root
, AUTO_DEFRAG
,
681 "enabling auto defrag");
684 btrfs_clear_and_info(root
, AUTO_DEFRAG
,
685 "disabling auto defrag");
688 btrfs_info(root
->fs_info
, "enabling auto recovery");
689 btrfs_set_opt(info
->mount_opt
, RECOVERY
);
691 case Opt_skip_balance
:
692 btrfs_set_opt(info
->mount_opt
, SKIP_BALANCE
);
694 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
695 case Opt_check_integrity_including_extent_data
:
696 btrfs_info(root
->fs_info
,
697 "enabling check integrity including extent data");
698 btrfs_set_opt(info
->mount_opt
,
699 CHECK_INTEGRITY_INCLUDING_EXTENT_DATA
);
700 btrfs_set_opt(info
->mount_opt
, CHECK_INTEGRITY
);
702 case Opt_check_integrity
:
703 btrfs_info(root
->fs_info
, "enabling check integrity");
704 btrfs_set_opt(info
->mount_opt
, CHECK_INTEGRITY
);
706 case Opt_check_integrity_print_mask
:
707 ret
= match_int(&args
[0], &intarg
);
710 } else if (intarg
>= 0) {
711 info
->check_integrity_print_mask
= intarg
;
712 btrfs_info(root
->fs_info
, "check_integrity_print_mask 0x%x",
713 info
->check_integrity_print_mask
);
720 case Opt_check_integrity_including_extent_data
:
721 case Opt_check_integrity
:
722 case Opt_check_integrity_print_mask
:
723 btrfs_err(root
->fs_info
,
724 "support for check_integrity* not compiled in!");
728 case Opt_fatal_errors
:
729 if (strcmp(args
[0].from
, "panic") == 0)
730 btrfs_set_opt(info
->mount_opt
,
731 PANIC_ON_FATAL_ERROR
);
732 else if (strcmp(args
[0].from
, "bug") == 0)
733 btrfs_clear_opt(info
->mount_opt
,
734 PANIC_ON_FATAL_ERROR
);
740 case Opt_commit_interval
:
742 ret
= match_int(&args
[0], &intarg
);
744 btrfs_err(root
->fs_info
, "invalid commit interval");
750 btrfs_warn(root
->fs_info
, "excessive commit interval %d",
753 info
->commit_interval
= intarg
;
755 btrfs_info(root
->fs_info
, "using default commit interval %ds",
756 BTRFS_DEFAULT_COMMIT_INTERVAL
);
757 info
->commit_interval
= BTRFS_DEFAULT_COMMIT_INTERVAL
;
760 #ifdef CONFIG_BTRFS_DEBUG
761 case Opt_fragment_all
:
762 btrfs_info(root
->fs_info
, "fragmenting all space");
763 btrfs_set_opt(info
->mount_opt
, FRAGMENT_DATA
);
764 btrfs_set_opt(info
->mount_opt
, FRAGMENT_METADATA
);
766 case Opt_fragment_metadata
:
767 btrfs_info(root
->fs_info
, "fragmenting metadata");
768 btrfs_set_opt(info
->mount_opt
,
771 case Opt_fragment_data
:
772 btrfs_info(root
->fs_info
, "fragmenting data");
773 btrfs_set_opt(info
->mount_opt
, FRAGMENT_DATA
);
777 btrfs_info(root
->fs_info
, "unrecognized mount option '%s'", p
);
785 if (btrfs_fs_compat_ro(root
->fs_info
, FREE_SPACE_TREE
) &&
786 !btrfs_test_opt(root
, FREE_SPACE_TREE
) &&
787 !btrfs_test_opt(root
, CLEAR_CACHE
)) {
788 btrfs_err(root
->fs_info
, "cannot disable free space tree");
792 if (!ret
&& btrfs_test_opt(root
, SPACE_CACHE
))
793 btrfs_info(root
->fs_info
, "disk space caching is enabled");
794 if (!ret
&& btrfs_test_opt(root
, FREE_SPACE_TREE
))
795 btrfs_info(root
->fs_info
, "using free space tree");
801 * Parse mount options that are required early in the mount process.
803 * All other options will be parsed on much later in the mount process and
804 * only when we need to allocate a new super block.
806 static int btrfs_parse_early_options(const char *options
, fmode_t flags
,
807 void *holder
, char **subvol_name
, u64
*subvol_objectid
,
808 struct btrfs_fs_devices
**fs_devices
)
810 substring_t args
[MAX_OPT_ARGS
];
811 char *device_name
, *opts
, *orig
, *p
;
819 * strsep changes the string, duplicate it because parse_options
822 opts
= kstrdup(options
, GFP_KERNEL
);
827 while ((p
= strsep(&opts
, ",")) != NULL
) {
832 token
= match_token(p
, tokens
, args
);
836 *subvol_name
= match_strdup(&args
[0]);
843 num
= match_strdup(&args
[0]);
845 *subvol_objectid
= memparse(num
, NULL
);
847 /* we want the original fs_tree */
848 if (!*subvol_objectid
)
850 BTRFS_FS_TREE_OBJECTID
;
856 case Opt_subvolrootid
:
858 "BTRFS: 'subvolrootid' mount option is deprecated and has "
862 device_name
= match_strdup(&args
[0]);
867 error
= btrfs_scan_one_device(device_name
,
868 flags
, holder
, fs_devices
);
883 static char *get_subvol_name_from_objectid(struct btrfs_fs_info
*fs_info
,
886 struct btrfs_root
*root
= fs_info
->tree_root
;
887 struct btrfs_root
*fs_root
;
888 struct btrfs_root_ref
*root_ref
;
889 struct btrfs_inode_ref
*inode_ref
;
890 struct btrfs_key key
;
891 struct btrfs_path
*path
= NULL
;
892 char *name
= NULL
, *ptr
;
897 path
= btrfs_alloc_path();
902 path
->leave_spinning
= 1;
904 name
= kmalloc(PATH_MAX
, GFP_NOFS
);
909 ptr
= name
+ PATH_MAX
- 1;
913 * Walk up the subvolume trees in the tree of tree roots by root
914 * backrefs until we hit the top-level subvolume.
916 while (subvol_objectid
!= BTRFS_FS_TREE_OBJECTID
) {
917 key
.objectid
= subvol_objectid
;
918 key
.type
= BTRFS_ROOT_BACKREF_KEY
;
919 key
.offset
= (u64
)-1;
921 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
924 } else if (ret
> 0) {
925 ret
= btrfs_previous_item(root
, path
, subvol_objectid
,
926 BTRFS_ROOT_BACKREF_KEY
);
929 } else if (ret
> 0) {
935 btrfs_item_key_to_cpu(path
->nodes
[0], &key
, path
->slots
[0]);
936 subvol_objectid
= key
.offset
;
938 root_ref
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
939 struct btrfs_root_ref
);
940 len
= btrfs_root_ref_name_len(path
->nodes
[0], root_ref
);
946 read_extent_buffer(path
->nodes
[0], ptr
+ 1,
947 (unsigned long)(root_ref
+ 1), len
);
949 dirid
= btrfs_root_ref_dirid(path
->nodes
[0], root_ref
);
950 btrfs_release_path(path
);
952 key
.objectid
= subvol_objectid
;
953 key
.type
= BTRFS_ROOT_ITEM_KEY
;
954 key
.offset
= (u64
)-1;
955 fs_root
= btrfs_read_fs_root_no_name(fs_info
, &key
);
956 if (IS_ERR(fs_root
)) {
957 ret
= PTR_ERR(fs_root
);
962 * Walk up the filesystem tree by inode refs until we hit the
965 while (dirid
!= BTRFS_FIRST_FREE_OBJECTID
) {
966 key
.objectid
= dirid
;
967 key
.type
= BTRFS_INODE_REF_KEY
;
968 key
.offset
= (u64
)-1;
970 ret
= btrfs_search_slot(NULL
, fs_root
, &key
, path
, 0, 0);
973 } else if (ret
> 0) {
974 ret
= btrfs_previous_item(fs_root
, path
, dirid
,
975 BTRFS_INODE_REF_KEY
);
978 } else if (ret
> 0) {
984 btrfs_item_key_to_cpu(path
->nodes
[0], &key
, path
->slots
[0]);
987 inode_ref
= btrfs_item_ptr(path
->nodes
[0],
989 struct btrfs_inode_ref
);
990 len
= btrfs_inode_ref_name_len(path
->nodes
[0],
997 read_extent_buffer(path
->nodes
[0], ptr
+ 1,
998 (unsigned long)(inode_ref
+ 1), len
);
1000 btrfs_release_path(path
);
1004 btrfs_free_path(path
);
1005 if (ptr
== name
+ PATH_MAX
- 1) {
1009 memmove(name
, ptr
, name
+ PATH_MAX
- ptr
);
1014 btrfs_free_path(path
);
1016 return ERR_PTR(ret
);
1019 static int get_default_subvol_objectid(struct btrfs_fs_info
*fs_info
, u64
*objectid
)
1021 struct btrfs_root
*root
= fs_info
->tree_root
;
1022 struct btrfs_dir_item
*di
;
1023 struct btrfs_path
*path
;
1024 struct btrfs_key location
;
1027 path
= btrfs_alloc_path();
1030 path
->leave_spinning
= 1;
1033 * Find the "default" dir item which points to the root item that we
1034 * will mount by default if we haven't been given a specific subvolume
1037 dir_id
= btrfs_super_root_dir(fs_info
->super_copy
);
1038 di
= btrfs_lookup_dir_item(NULL
, root
, path
, dir_id
, "default", 7, 0);
1040 btrfs_free_path(path
);
1045 * Ok the default dir item isn't there. This is weird since
1046 * it's always been there, but don't freak out, just try and
1047 * mount the top-level subvolume.
1049 btrfs_free_path(path
);
1050 *objectid
= BTRFS_FS_TREE_OBJECTID
;
1054 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, &location
);
1055 btrfs_free_path(path
);
1056 *objectid
= location
.objectid
;
1060 static int btrfs_fill_super(struct super_block
*sb
,
1061 struct btrfs_fs_devices
*fs_devices
,
1062 void *data
, int silent
)
1064 struct inode
*inode
;
1065 struct btrfs_fs_info
*fs_info
= btrfs_sb(sb
);
1066 struct btrfs_key key
;
1069 sb
->s_maxbytes
= MAX_LFS_FILESIZE
;
1070 sb
->s_magic
= BTRFS_SUPER_MAGIC
;
1071 sb
->s_op
= &btrfs_super_ops
;
1072 sb
->s_d_op
= &btrfs_dentry_operations
;
1073 sb
->s_export_op
= &btrfs_export_ops
;
1074 sb
->s_xattr
= btrfs_xattr_handlers
;
1075 sb
->s_time_gran
= 1;
1076 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
1077 sb
->s_flags
|= MS_POSIXACL
;
1079 sb
->s_flags
|= MS_I_VERSION
;
1080 sb
->s_iflags
|= SB_I_CGROUPWB
;
1081 err
= open_ctree(sb
, fs_devices
, (char *)data
);
1083 printk(KERN_ERR
"BTRFS: open_ctree failed\n");
1087 key
.objectid
= BTRFS_FIRST_FREE_OBJECTID
;
1088 key
.type
= BTRFS_INODE_ITEM_KEY
;
1090 inode
= btrfs_iget(sb
, &key
, fs_info
->fs_root
, NULL
);
1091 if (IS_ERR(inode
)) {
1092 err
= PTR_ERR(inode
);
1096 sb
->s_root
= d_make_root(inode
);
1102 save_mount_options(sb
, data
);
1103 cleancache_init_fs(sb
);
1104 sb
->s_flags
|= MS_ACTIVE
;
1108 close_ctree(fs_info
->tree_root
);
1112 int btrfs_sync_fs(struct super_block
*sb
, int wait
)
1114 struct btrfs_trans_handle
*trans
;
1115 struct btrfs_fs_info
*fs_info
= btrfs_sb(sb
);
1116 struct btrfs_root
*root
= fs_info
->tree_root
;
1118 trace_btrfs_sync_fs(wait
);
1121 filemap_flush(fs_info
->btree_inode
->i_mapping
);
1125 btrfs_wait_ordered_roots(fs_info
, -1);
1127 trans
= btrfs_attach_transaction_barrier(root
);
1128 if (IS_ERR(trans
)) {
1129 /* no transaction, don't bother */
1130 if (PTR_ERR(trans
) == -ENOENT
) {
1132 * Exit unless we have some pending changes
1133 * that need to go through commit
1135 if (fs_info
->pending_changes
== 0)
1138 * A non-blocking test if the fs is frozen. We must not
1139 * start a new transaction here otherwise a deadlock
1140 * happens. The pending operations are delayed to the
1141 * next commit after thawing.
1143 if (__sb_start_write(sb
, SB_FREEZE_WRITE
, false))
1144 __sb_end_write(sb
, SB_FREEZE_WRITE
);
1147 trans
= btrfs_start_transaction(root
, 0);
1150 return PTR_ERR(trans
);
1152 return btrfs_commit_transaction(trans
, root
);
1155 static int btrfs_show_options(struct seq_file
*seq
, struct dentry
*dentry
)
1157 struct btrfs_fs_info
*info
= btrfs_sb(dentry
->d_sb
);
1158 struct btrfs_root
*root
= info
->tree_root
;
1159 char *compress_type
;
1161 if (btrfs_test_opt(root
, DEGRADED
))
1162 seq_puts(seq
, ",degraded");
1163 if (btrfs_test_opt(root
, NODATASUM
))
1164 seq_puts(seq
, ",nodatasum");
1165 if (btrfs_test_opt(root
, NODATACOW
))
1166 seq_puts(seq
, ",nodatacow");
1167 if (btrfs_test_opt(root
, NOBARRIER
))
1168 seq_puts(seq
, ",nobarrier");
1169 if (info
->max_inline
!= BTRFS_DEFAULT_MAX_INLINE
)
1170 seq_printf(seq
, ",max_inline=%llu", info
->max_inline
);
1171 if (info
->alloc_start
!= 0)
1172 seq_printf(seq
, ",alloc_start=%llu", info
->alloc_start
);
1173 if (info
->thread_pool_size
!= min_t(unsigned long,
1174 num_online_cpus() + 2, 8))
1175 seq_printf(seq
, ",thread_pool=%d", info
->thread_pool_size
);
1176 if (btrfs_test_opt(root
, COMPRESS
)) {
1177 if (info
->compress_type
== BTRFS_COMPRESS_ZLIB
)
1178 compress_type
= "zlib";
1180 compress_type
= "lzo";
1181 if (btrfs_test_opt(root
, FORCE_COMPRESS
))
1182 seq_printf(seq
, ",compress-force=%s", compress_type
);
1184 seq_printf(seq
, ",compress=%s", compress_type
);
1186 if (btrfs_test_opt(root
, NOSSD
))
1187 seq_puts(seq
, ",nossd");
1188 if (btrfs_test_opt(root
, SSD_SPREAD
))
1189 seq_puts(seq
, ",ssd_spread");
1190 else if (btrfs_test_opt(root
, SSD
))
1191 seq_puts(seq
, ",ssd");
1192 if (btrfs_test_opt(root
, NOTREELOG
))
1193 seq_puts(seq
, ",notreelog");
1194 if (btrfs_test_opt(root
, FLUSHONCOMMIT
))
1195 seq_puts(seq
, ",flushoncommit");
1196 if (btrfs_test_opt(root
, DISCARD
))
1197 seq_puts(seq
, ",discard");
1198 if (!(root
->fs_info
->sb
->s_flags
& MS_POSIXACL
))
1199 seq_puts(seq
, ",noacl");
1200 if (btrfs_test_opt(root
, SPACE_CACHE
))
1201 seq_puts(seq
, ",space_cache");
1202 else if (btrfs_test_opt(root
, FREE_SPACE_TREE
))
1203 seq_puts(seq
, ",space_cache=v2");
1205 seq_puts(seq
, ",nospace_cache");
1206 if (btrfs_test_opt(root
, RESCAN_UUID_TREE
))
1207 seq_puts(seq
, ",rescan_uuid_tree");
1208 if (btrfs_test_opt(root
, CLEAR_CACHE
))
1209 seq_puts(seq
, ",clear_cache");
1210 if (btrfs_test_opt(root
, USER_SUBVOL_RM_ALLOWED
))
1211 seq_puts(seq
, ",user_subvol_rm_allowed");
1212 if (btrfs_test_opt(root
, ENOSPC_DEBUG
))
1213 seq_puts(seq
, ",enospc_debug");
1214 if (btrfs_test_opt(root
, AUTO_DEFRAG
))
1215 seq_puts(seq
, ",autodefrag");
1216 if (btrfs_test_opt(root
, INODE_MAP_CACHE
))
1217 seq_puts(seq
, ",inode_cache");
1218 if (btrfs_test_opt(root
, SKIP_BALANCE
))
1219 seq_puts(seq
, ",skip_balance");
1220 if (btrfs_test_opt(root
, RECOVERY
))
1221 seq_puts(seq
, ",recovery");
1222 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
1223 if (btrfs_test_opt(root
, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA
))
1224 seq_puts(seq
, ",check_int_data");
1225 else if (btrfs_test_opt(root
, CHECK_INTEGRITY
))
1226 seq_puts(seq
, ",check_int");
1227 if (info
->check_integrity_print_mask
)
1228 seq_printf(seq
, ",check_int_print_mask=%d",
1229 info
->check_integrity_print_mask
);
1231 if (info
->metadata_ratio
)
1232 seq_printf(seq
, ",metadata_ratio=%d",
1233 info
->metadata_ratio
);
1234 if (btrfs_test_opt(root
, PANIC_ON_FATAL_ERROR
))
1235 seq_puts(seq
, ",fatal_errors=panic");
1236 if (info
->commit_interval
!= BTRFS_DEFAULT_COMMIT_INTERVAL
)
1237 seq_printf(seq
, ",commit=%d", info
->commit_interval
);
1238 #ifdef CONFIG_BTRFS_DEBUG
1239 if (btrfs_test_opt(root
, FRAGMENT_DATA
))
1240 seq_puts(seq
, ",fragment=data");
1241 if (btrfs_test_opt(root
, FRAGMENT_METADATA
))
1242 seq_puts(seq
, ",fragment=metadata");
1244 seq_printf(seq
, ",subvolid=%llu",
1245 BTRFS_I(d_inode(dentry
))->root
->root_key
.objectid
);
1246 seq_puts(seq
, ",subvol=");
1247 seq_dentry(seq
, dentry
, " \t\n\\");
1251 static int btrfs_test_super(struct super_block
*s
, void *data
)
1253 struct btrfs_fs_info
*p
= data
;
1254 struct btrfs_fs_info
*fs_info
= btrfs_sb(s
);
1256 return fs_info
->fs_devices
== p
->fs_devices
;
1259 static int btrfs_set_super(struct super_block
*s
, void *data
)
1261 int err
= set_anon_super(s
, data
);
1263 s
->s_fs_info
= data
;
1268 * subvolumes are identified by ino 256
1270 static inline int is_subvolume_inode(struct inode
*inode
)
1272 if (inode
&& inode
->i_ino
== BTRFS_FIRST_FREE_OBJECTID
)
1278 * This will add subvolid=0 to the argument string while removing any subvol=
1279 * and subvolid= arguments to make sure we get the top-level root for path
1280 * walking to the subvol we want.
1282 static char *setup_root_args(char *args
)
1284 char *buf
, *dst
, *sep
;
1287 return kstrdup("subvolid=0", GFP_NOFS
);
1289 /* The worst case is that we add ",subvolid=0" to the end. */
1290 buf
= dst
= kmalloc(strlen(args
) + strlen(",subvolid=0") + 1, GFP_NOFS
);
1295 sep
= strchrnul(args
, ',');
1296 if (!strstarts(args
, "subvol=") &&
1297 !strstarts(args
, "subvolid=")) {
1298 memcpy(dst
, args
, sep
- args
);
1307 strcpy(dst
, "subvolid=0");
1312 static struct dentry
*mount_subvol(const char *subvol_name
, u64 subvol_objectid
,
1313 int flags
, const char *device_name
,
1316 struct dentry
*root
;
1317 struct vfsmount
*mnt
= NULL
;
1321 newargs
= setup_root_args(data
);
1323 root
= ERR_PTR(-ENOMEM
);
1327 mnt
= vfs_kern_mount(&btrfs_fs_type
, flags
, device_name
, newargs
);
1328 if (PTR_ERR_OR_ZERO(mnt
) == -EBUSY
) {
1329 if (flags
& MS_RDONLY
) {
1330 mnt
= vfs_kern_mount(&btrfs_fs_type
, flags
& ~MS_RDONLY
,
1331 device_name
, newargs
);
1333 mnt
= vfs_kern_mount(&btrfs_fs_type
, flags
| MS_RDONLY
,
1334 device_name
, newargs
);
1336 root
= ERR_CAST(mnt
);
1341 down_write(&mnt
->mnt_sb
->s_umount
);
1342 ret
= btrfs_remount(mnt
->mnt_sb
, &flags
, NULL
);
1343 up_write(&mnt
->mnt_sb
->s_umount
);
1345 root
= ERR_PTR(ret
);
1351 root
= ERR_CAST(mnt
);
1357 if (!subvol_objectid
) {
1358 ret
= get_default_subvol_objectid(btrfs_sb(mnt
->mnt_sb
),
1361 root
= ERR_PTR(ret
);
1365 subvol_name
= get_subvol_name_from_objectid(btrfs_sb(mnt
->mnt_sb
),
1367 if (IS_ERR(subvol_name
)) {
1368 root
= ERR_CAST(subvol_name
);
1375 root
= mount_subtree(mnt
, subvol_name
);
1376 /* mount_subtree() drops our reference on the vfsmount. */
1379 if (!IS_ERR(root
)) {
1380 struct super_block
*s
= root
->d_sb
;
1381 struct inode
*root_inode
= d_inode(root
);
1382 u64 root_objectid
= BTRFS_I(root_inode
)->root
->root_key
.objectid
;
1385 if (!is_subvolume_inode(root_inode
)) {
1386 pr_err("BTRFS: '%s' is not a valid subvolume\n",
1390 if (subvol_objectid
&& root_objectid
!= subvol_objectid
) {
1392 * This will also catch a race condition where a
1393 * subvolume which was passed by ID is renamed and
1394 * another subvolume is renamed over the old location.
1396 pr_err("BTRFS: subvol '%s' does not match subvolid %llu\n",
1397 subvol_name
, subvol_objectid
);
1402 root
= ERR_PTR(ret
);
1403 deactivate_locked_super(s
);
1414 static int parse_security_options(char *orig_opts
,
1415 struct security_mnt_opts
*sec_opts
)
1417 char *secdata
= NULL
;
1420 secdata
= alloc_secdata();
1423 ret
= security_sb_copy_data(orig_opts
, secdata
);
1425 free_secdata(secdata
);
1428 ret
= security_sb_parse_opts_str(secdata
, sec_opts
);
1429 free_secdata(secdata
);
1433 static int setup_security_options(struct btrfs_fs_info
*fs_info
,
1434 struct super_block
*sb
,
1435 struct security_mnt_opts
*sec_opts
)
1440 * Call security_sb_set_mnt_opts() to check whether new sec_opts
1443 ret
= security_sb_set_mnt_opts(sb
, sec_opts
, 0, NULL
);
1447 #ifdef CONFIG_SECURITY
1448 if (!fs_info
->security_opts
.num_mnt_opts
) {
1449 /* first time security setup, copy sec_opts to fs_info */
1450 memcpy(&fs_info
->security_opts
, sec_opts
, sizeof(*sec_opts
));
1453 * Since SELinux(the only one supports security_mnt_opts) does
1454 * NOT support changing context during remount/mount same sb,
1455 * This must be the same or part of the same security options,
1458 security_free_mnt_opts(sec_opts
);
1465 * Find a superblock for the given device / mount point.
1467 * Note: This is based on get_sb_bdev from fs/super.c with a few additions
1468 * for multiple device setup. Make sure to keep it in sync.
1470 static struct dentry
*btrfs_mount(struct file_system_type
*fs_type
, int flags
,
1471 const char *device_name
, void *data
)
1473 struct block_device
*bdev
= NULL
;
1474 struct super_block
*s
;
1475 struct btrfs_fs_devices
*fs_devices
= NULL
;
1476 struct btrfs_fs_info
*fs_info
= NULL
;
1477 struct security_mnt_opts new_sec_opts
;
1478 fmode_t mode
= FMODE_READ
;
1479 char *subvol_name
= NULL
;
1480 u64 subvol_objectid
= 0;
1483 if (!(flags
& MS_RDONLY
))
1484 mode
|= FMODE_WRITE
;
1486 error
= btrfs_parse_early_options(data
, mode
, fs_type
,
1487 &subvol_name
, &subvol_objectid
,
1491 return ERR_PTR(error
);
1494 if (subvol_name
|| subvol_objectid
!= BTRFS_FS_TREE_OBJECTID
) {
1495 /* mount_subvol() will free subvol_name. */
1496 return mount_subvol(subvol_name
, subvol_objectid
, flags
,
1500 security_init_mnt_opts(&new_sec_opts
);
1502 error
= parse_security_options(data
, &new_sec_opts
);
1504 return ERR_PTR(error
);
1507 error
= btrfs_scan_one_device(device_name
, mode
, fs_type
, &fs_devices
);
1509 goto error_sec_opts
;
1512 * Setup a dummy root and fs_info for test/set super. This is because
1513 * we don't actually fill this stuff out until open_ctree, but we need
1514 * it for searching for existing supers, so this lets us do that and
1515 * then open_ctree will properly initialize everything later.
1517 fs_info
= kzalloc(sizeof(struct btrfs_fs_info
), GFP_NOFS
);
1520 goto error_sec_opts
;
1523 fs_info
->fs_devices
= fs_devices
;
1525 fs_info
->super_copy
= kzalloc(BTRFS_SUPER_INFO_SIZE
, GFP_NOFS
);
1526 fs_info
->super_for_commit
= kzalloc(BTRFS_SUPER_INFO_SIZE
, GFP_NOFS
);
1527 security_init_mnt_opts(&fs_info
->security_opts
);
1528 if (!fs_info
->super_copy
|| !fs_info
->super_for_commit
) {
1533 error
= btrfs_open_devices(fs_devices
, mode
, fs_type
);
1537 if (!(flags
& MS_RDONLY
) && fs_devices
->rw_devices
== 0) {
1539 goto error_close_devices
;
1542 bdev
= fs_devices
->latest_bdev
;
1543 s
= sget(fs_type
, btrfs_test_super
, btrfs_set_super
, flags
| MS_NOSEC
,
1547 goto error_close_devices
;
1551 btrfs_close_devices(fs_devices
);
1552 free_fs_info(fs_info
);
1553 if ((flags
^ s
->s_flags
) & MS_RDONLY
)
1556 char b
[BDEVNAME_SIZE
];
1558 strlcpy(s
->s_id
, bdevname(bdev
, b
), sizeof(s
->s_id
));
1559 btrfs_sb(s
)->bdev_holder
= fs_type
;
1560 error
= btrfs_fill_super(s
, fs_devices
, data
,
1561 flags
& MS_SILENT
? 1 : 0);
1564 deactivate_locked_super(s
);
1565 goto error_sec_opts
;
1568 fs_info
= btrfs_sb(s
);
1569 error
= setup_security_options(fs_info
, s
, &new_sec_opts
);
1571 deactivate_locked_super(s
);
1572 goto error_sec_opts
;
1575 return dget(s
->s_root
);
1577 error_close_devices
:
1578 btrfs_close_devices(fs_devices
);
1580 free_fs_info(fs_info
);
1582 security_free_mnt_opts(&new_sec_opts
);
1583 return ERR_PTR(error
);
1586 static void btrfs_resize_thread_pool(struct btrfs_fs_info
*fs_info
,
1587 int new_pool_size
, int old_pool_size
)
1589 if (new_pool_size
== old_pool_size
)
1592 fs_info
->thread_pool_size
= new_pool_size
;
1594 btrfs_info(fs_info
, "resize thread pool %d -> %d",
1595 old_pool_size
, new_pool_size
);
1597 btrfs_workqueue_set_max(fs_info
->workers
, new_pool_size
);
1598 btrfs_workqueue_set_max(fs_info
->delalloc_workers
, new_pool_size
);
1599 btrfs_workqueue_set_max(fs_info
->submit_workers
, new_pool_size
);
1600 btrfs_workqueue_set_max(fs_info
->caching_workers
, new_pool_size
);
1601 btrfs_workqueue_set_max(fs_info
->endio_workers
, new_pool_size
);
1602 btrfs_workqueue_set_max(fs_info
->endio_meta_workers
, new_pool_size
);
1603 btrfs_workqueue_set_max(fs_info
->endio_meta_write_workers
,
1605 btrfs_workqueue_set_max(fs_info
->endio_write_workers
, new_pool_size
);
1606 btrfs_workqueue_set_max(fs_info
->endio_freespace_worker
, new_pool_size
);
1607 btrfs_workqueue_set_max(fs_info
->delayed_workers
, new_pool_size
);
1608 btrfs_workqueue_set_max(fs_info
->readahead_workers
, new_pool_size
);
1609 btrfs_workqueue_set_max(fs_info
->scrub_wr_completion_workers
,
1613 static inline void btrfs_remount_prepare(struct btrfs_fs_info
*fs_info
)
1615 set_bit(BTRFS_FS_STATE_REMOUNTING
, &fs_info
->fs_state
);
1618 static inline void btrfs_remount_begin(struct btrfs_fs_info
*fs_info
,
1619 unsigned long old_opts
, int flags
)
1621 if (btrfs_raw_test_opt(old_opts
, AUTO_DEFRAG
) &&
1622 (!btrfs_raw_test_opt(fs_info
->mount_opt
, AUTO_DEFRAG
) ||
1623 (flags
& MS_RDONLY
))) {
1624 /* wait for any defraggers to finish */
1625 wait_event(fs_info
->transaction_wait
,
1626 (atomic_read(&fs_info
->defrag_running
) == 0));
1627 if (flags
& MS_RDONLY
)
1628 sync_filesystem(fs_info
->sb
);
1632 static inline void btrfs_remount_cleanup(struct btrfs_fs_info
*fs_info
,
1633 unsigned long old_opts
)
1636 * We need cleanup all defragable inodes if the autodefragment is
1637 * close or the fs is R/O.
1639 if (btrfs_raw_test_opt(old_opts
, AUTO_DEFRAG
) &&
1640 (!btrfs_raw_test_opt(fs_info
->mount_opt
, AUTO_DEFRAG
) ||
1641 (fs_info
->sb
->s_flags
& MS_RDONLY
))) {
1642 btrfs_cleanup_defrag_inodes(fs_info
);
1645 clear_bit(BTRFS_FS_STATE_REMOUNTING
, &fs_info
->fs_state
);
1648 static int btrfs_remount(struct super_block
*sb
, int *flags
, char *data
)
1650 struct btrfs_fs_info
*fs_info
= btrfs_sb(sb
);
1651 struct btrfs_root
*root
= fs_info
->tree_root
;
1652 unsigned old_flags
= sb
->s_flags
;
1653 unsigned long old_opts
= fs_info
->mount_opt
;
1654 unsigned long old_compress_type
= fs_info
->compress_type
;
1655 u64 old_max_inline
= fs_info
->max_inline
;
1656 u64 old_alloc_start
= fs_info
->alloc_start
;
1657 int old_thread_pool_size
= fs_info
->thread_pool_size
;
1658 unsigned int old_metadata_ratio
= fs_info
->metadata_ratio
;
1661 sync_filesystem(sb
);
1662 btrfs_remount_prepare(fs_info
);
1665 struct security_mnt_opts new_sec_opts
;
1667 security_init_mnt_opts(&new_sec_opts
);
1668 ret
= parse_security_options(data
, &new_sec_opts
);
1671 ret
= setup_security_options(fs_info
, sb
,
1674 security_free_mnt_opts(&new_sec_opts
);
1679 ret
= btrfs_parse_options(root
, data
);
1685 btrfs_remount_begin(fs_info
, old_opts
, *flags
);
1686 btrfs_resize_thread_pool(fs_info
,
1687 fs_info
->thread_pool_size
, old_thread_pool_size
);
1689 if ((*flags
& MS_RDONLY
) == (sb
->s_flags
& MS_RDONLY
))
1692 if (*flags
& MS_RDONLY
) {
1694 * this also happens on 'umount -rf' or on shutdown, when
1695 * the filesystem is busy.
1697 cancel_work_sync(&fs_info
->async_reclaim_work
);
1699 /* wait for the uuid_scan task to finish */
1700 down(&fs_info
->uuid_tree_rescan_sem
);
1701 /* avoid complains from lockdep et al. */
1702 up(&fs_info
->uuid_tree_rescan_sem
);
1704 sb
->s_flags
|= MS_RDONLY
;
1707 * Setting MS_RDONLY will put the cleaner thread to
1708 * sleep at the next loop if it's already active.
1709 * If it's already asleep, we'll leave unused block
1710 * groups on disk until we're mounted read-write again
1711 * unless we clean them up here.
1713 btrfs_delete_unused_bgs(fs_info
);
1715 btrfs_dev_replace_suspend_for_unmount(fs_info
);
1716 btrfs_scrub_cancel(fs_info
);
1717 btrfs_pause_balance(fs_info
);
1719 ret
= btrfs_commit_super(root
);
1723 if (test_bit(BTRFS_FS_STATE_ERROR
, &root
->fs_info
->fs_state
)) {
1725 "Remounting read-write after error is not allowed");
1729 if (fs_info
->fs_devices
->rw_devices
== 0) {
1734 if (fs_info
->fs_devices
->missing_devices
>
1735 fs_info
->num_tolerated_disk_barrier_failures
&&
1736 !(*flags
& MS_RDONLY
)) {
1738 "too many missing devices, writeable remount is not allowed");
1743 if (btrfs_super_log_root(fs_info
->super_copy
) != 0) {
1748 ret
= btrfs_cleanup_fs_roots(fs_info
);
1752 /* recover relocation */
1753 mutex_lock(&fs_info
->cleaner_mutex
);
1754 ret
= btrfs_recover_relocation(root
);
1755 mutex_unlock(&fs_info
->cleaner_mutex
);
1759 ret
= btrfs_resume_balance_async(fs_info
);
1763 ret
= btrfs_resume_dev_replace_async(fs_info
);
1765 btrfs_warn(fs_info
, "failed to resume dev_replace");
1769 if (!fs_info
->uuid_root
) {
1770 btrfs_info(fs_info
, "creating UUID tree");
1771 ret
= btrfs_create_uuid_tree(fs_info
);
1773 btrfs_warn(fs_info
, "failed to create the UUID tree %d", ret
);
1777 sb
->s_flags
&= ~MS_RDONLY
;
1780 wake_up_process(fs_info
->transaction_kthread
);
1781 btrfs_remount_cleanup(fs_info
, old_opts
);
1785 /* We've hit an error - don't reset MS_RDONLY */
1786 if (sb
->s_flags
& MS_RDONLY
)
1787 old_flags
|= MS_RDONLY
;
1788 sb
->s_flags
= old_flags
;
1789 fs_info
->mount_opt
= old_opts
;
1790 fs_info
->compress_type
= old_compress_type
;
1791 fs_info
->max_inline
= old_max_inline
;
1792 mutex_lock(&fs_info
->chunk_mutex
);
1793 fs_info
->alloc_start
= old_alloc_start
;
1794 mutex_unlock(&fs_info
->chunk_mutex
);
1795 btrfs_resize_thread_pool(fs_info
,
1796 old_thread_pool_size
, fs_info
->thread_pool_size
);
1797 fs_info
->metadata_ratio
= old_metadata_ratio
;
1798 btrfs_remount_cleanup(fs_info
, old_opts
);
1802 /* Used to sort the devices by max_avail(descending sort) */
1803 static int btrfs_cmp_device_free_bytes(const void *dev_info1
,
1804 const void *dev_info2
)
1806 if (((struct btrfs_device_info
*)dev_info1
)->max_avail
>
1807 ((struct btrfs_device_info
*)dev_info2
)->max_avail
)
1809 else if (((struct btrfs_device_info
*)dev_info1
)->max_avail
<
1810 ((struct btrfs_device_info
*)dev_info2
)->max_avail
)
1817 * sort the devices by max_avail, in which max free extent size of each device
1818 * is stored.(Descending Sort)
1820 static inline void btrfs_descending_sort_devices(
1821 struct btrfs_device_info
*devices
,
1824 sort(devices
, nr_devices
, sizeof(struct btrfs_device_info
),
1825 btrfs_cmp_device_free_bytes
, NULL
);
1829 * The helper to calc the free space on the devices that can be used to store
1832 static int btrfs_calc_avail_data_space(struct btrfs_root
*root
, u64
*free_bytes
)
1834 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1835 struct btrfs_device_info
*devices_info
;
1836 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
1837 struct btrfs_device
*device
;
1842 u64 min_stripe_size
;
1843 int min_stripes
= 1, num_stripes
= 1;
1844 int i
= 0, nr_devices
;
1848 * We aren't under the device list lock, so this is racey-ish, but good
1849 * enough for our purposes.
1851 nr_devices
= fs_info
->fs_devices
->open_devices
;
1854 nr_devices
= fs_info
->fs_devices
->open_devices
;
1862 devices_info
= kmalloc_array(nr_devices
, sizeof(*devices_info
),
1867 /* calc min stripe number for data space alloction */
1868 type
= btrfs_get_alloc_profile(root
, 1);
1869 if (type
& BTRFS_BLOCK_GROUP_RAID0
) {
1871 num_stripes
= nr_devices
;
1872 } else if (type
& BTRFS_BLOCK_GROUP_RAID1
) {
1875 } else if (type
& BTRFS_BLOCK_GROUP_RAID10
) {
1880 if (type
& BTRFS_BLOCK_GROUP_DUP
)
1881 min_stripe_size
= 2 * BTRFS_STRIPE_LEN
;
1883 min_stripe_size
= BTRFS_STRIPE_LEN
;
1885 if (fs_info
->alloc_start
)
1886 mutex_lock(&fs_devices
->device_list_mutex
);
1888 list_for_each_entry_rcu(device
, &fs_devices
->devices
, dev_list
) {
1889 if (!device
->in_fs_metadata
|| !device
->bdev
||
1890 device
->is_tgtdev_for_dev_replace
)
1893 if (i
>= nr_devices
)
1896 avail_space
= device
->total_bytes
- device
->bytes_used
;
1898 /* align with stripe_len */
1899 avail_space
= div_u64(avail_space
, BTRFS_STRIPE_LEN
);
1900 avail_space
*= BTRFS_STRIPE_LEN
;
1903 * In order to avoid overwritting the superblock on the drive,
1904 * btrfs starts at an offset of at least 1MB when doing chunk
1909 /* user can set the offset in fs_info->alloc_start. */
1910 if (fs_info
->alloc_start
&&
1911 fs_info
->alloc_start
+ BTRFS_STRIPE_LEN
<=
1912 device
->total_bytes
) {
1914 skip_space
= max(fs_info
->alloc_start
, skip_space
);
1917 * btrfs can not use the free space in
1918 * [0, skip_space - 1], we must subtract it from the
1919 * total. In order to implement it, we account the used
1920 * space in this range first.
1922 ret
= btrfs_account_dev_extents_size(device
, 0,
1926 kfree(devices_info
);
1927 mutex_unlock(&fs_devices
->device_list_mutex
);
1933 /* calc the free space in [0, skip_space - 1] */
1934 skip_space
-= used_space
;
1938 * we can use the free space in [0, skip_space - 1], subtract
1939 * it from the total.
1941 if (avail_space
&& avail_space
>= skip_space
)
1942 avail_space
-= skip_space
;
1946 if (avail_space
< min_stripe_size
)
1949 devices_info
[i
].dev
= device
;
1950 devices_info
[i
].max_avail
= avail_space
;
1955 if (fs_info
->alloc_start
)
1956 mutex_unlock(&fs_devices
->device_list_mutex
);
1960 btrfs_descending_sort_devices(devices_info
, nr_devices
);
1964 while (nr_devices
>= min_stripes
) {
1965 if (num_stripes
> nr_devices
)
1966 num_stripes
= nr_devices
;
1968 if (devices_info
[i
].max_avail
>= min_stripe_size
) {
1972 avail_space
+= devices_info
[i
].max_avail
* num_stripes
;
1973 alloc_size
= devices_info
[i
].max_avail
;
1974 for (j
= i
+ 1 - num_stripes
; j
<= i
; j
++)
1975 devices_info
[j
].max_avail
-= alloc_size
;
1981 kfree(devices_info
);
1982 *free_bytes
= avail_space
;
1987 * Calculate numbers for 'df', pessimistic in case of mixed raid profiles.
1989 * If there's a redundant raid level at DATA block groups, use the respective
1990 * multiplier to scale the sizes.
1992 * Unused device space usage is based on simulating the chunk allocator
1993 * algorithm that respects the device sizes, order of allocations and the
1994 * 'alloc_start' value, this is a close approximation of the actual use but
1995 * there are other factors that may change the result (like a new metadata
1998 * If metadata is exhausted, f_bavail will be 0.
2000 * FIXME: not accurate for mixed block groups, total and free/used are ok,
2001 * available appears slightly larger.
2003 static int btrfs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
2005 struct btrfs_fs_info
*fs_info
= btrfs_sb(dentry
->d_sb
);
2006 struct btrfs_super_block
*disk_super
= fs_info
->super_copy
;
2007 struct list_head
*head
= &fs_info
->space_info
;
2008 struct btrfs_space_info
*found
;
2010 u64 total_free_data
= 0;
2011 u64 total_free_meta
= 0;
2012 int bits
= dentry
->d_sb
->s_blocksize_bits
;
2013 __be32
*fsid
= (__be32
*)fs_info
->fsid
;
2014 unsigned factor
= 1;
2015 struct btrfs_block_rsv
*block_rsv
= &fs_info
->global_block_rsv
;
2020 * holding chunk_muext to avoid allocating new chunks, holding
2021 * device_list_mutex to avoid the device being removed
2024 list_for_each_entry_rcu(found
, head
, list
) {
2025 if (found
->flags
& BTRFS_BLOCK_GROUP_DATA
) {
2028 total_free_data
+= found
->disk_total
- found
->disk_used
;
2030 btrfs_account_ro_block_groups_free_space(found
);
2032 for (i
= 0; i
< BTRFS_NR_RAID_TYPES
; i
++) {
2033 if (!list_empty(&found
->block_groups
[i
])) {
2035 case BTRFS_RAID_DUP
:
2036 case BTRFS_RAID_RAID1
:
2037 case BTRFS_RAID_RAID10
:
2043 if (found
->flags
& BTRFS_BLOCK_GROUP_METADATA
)
2044 total_free_meta
+= found
->disk_total
- found
->disk_used
;
2046 total_used
+= found
->disk_used
;
2051 buf
->f_blocks
= div_u64(btrfs_super_total_bytes(disk_super
), factor
);
2052 buf
->f_blocks
>>= bits
;
2053 buf
->f_bfree
= buf
->f_blocks
- (div_u64(total_used
, factor
) >> bits
);
2055 /* Account global block reserve as used, it's in logical size already */
2056 spin_lock(&block_rsv
->lock
);
2057 buf
->f_bfree
-= block_rsv
->size
>> bits
;
2058 spin_unlock(&block_rsv
->lock
);
2060 buf
->f_bavail
= div_u64(total_free_data
, factor
);
2061 ret
= btrfs_calc_avail_data_space(fs_info
->tree_root
, &total_free_data
);
2064 buf
->f_bavail
+= div_u64(total_free_data
, factor
);
2065 buf
->f_bavail
= buf
->f_bavail
>> bits
;
2068 * We calculate the remaining metadata space minus global reserve. If
2069 * this is (supposedly) smaller than zero, there's no space. But this
2070 * does not hold in practice, the exhausted state happens where's still
2071 * some positive delta. So we apply some guesswork and compare the
2072 * delta to a 4M threshold. (Practically observed delta was ~2M.)
2074 * We probably cannot calculate the exact threshold value because this
2075 * depends on the internal reservations requested by various
2076 * operations, so some operations that consume a few metadata will
2077 * succeed even if the Avail is zero. But this is better than the other
2080 thresh
= 4 * 1024 * 1024;
2082 if (total_free_meta
- thresh
< block_rsv
->size
)
2085 buf
->f_type
= BTRFS_SUPER_MAGIC
;
2086 buf
->f_bsize
= dentry
->d_sb
->s_blocksize
;
2087 buf
->f_namelen
= BTRFS_NAME_LEN
;
2089 /* We treat it as constant endianness (it doesn't matter _which_)
2090 because we want the fsid to come out the same whether mounted
2091 on a big-endian or little-endian host */
2092 buf
->f_fsid
.val
[0] = be32_to_cpu(fsid
[0]) ^ be32_to_cpu(fsid
[2]);
2093 buf
->f_fsid
.val
[1] = be32_to_cpu(fsid
[1]) ^ be32_to_cpu(fsid
[3]);
2094 /* Mask in the root object ID too, to disambiguate subvols */
2095 buf
->f_fsid
.val
[0] ^= BTRFS_I(d_inode(dentry
))->root
->objectid
>> 32;
2096 buf
->f_fsid
.val
[1] ^= BTRFS_I(d_inode(dentry
))->root
->objectid
;
2101 static void btrfs_kill_super(struct super_block
*sb
)
2103 struct btrfs_fs_info
*fs_info
= btrfs_sb(sb
);
2104 kill_anon_super(sb
);
2105 free_fs_info(fs_info
);
2108 static struct file_system_type btrfs_fs_type
= {
2109 .owner
= THIS_MODULE
,
2111 .mount
= btrfs_mount
,
2112 .kill_sb
= btrfs_kill_super
,
2113 .fs_flags
= FS_REQUIRES_DEV
| FS_BINARY_MOUNTDATA
,
2115 MODULE_ALIAS_FS("btrfs");
2117 static int btrfs_control_open(struct inode
*inode
, struct file
*file
)
2120 * The control file's private_data is used to hold the
2121 * transaction when it is started and is used to keep
2122 * track of whether a transaction is already in progress.
2124 file
->private_data
= NULL
;
2129 * used by btrfsctl to scan devices when no FS is mounted
2131 static long btrfs_control_ioctl(struct file
*file
, unsigned int cmd
,
2134 struct btrfs_ioctl_vol_args
*vol
;
2135 struct btrfs_fs_devices
*fs_devices
;
2138 if (!capable(CAP_SYS_ADMIN
))
2141 vol
= memdup_user((void __user
*)arg
, sizeof(*vol
));
2143 return PTR_ERR(vol
);
2146 case BTRFS_IOC_SCAN_DEV
:
2147 ret
= btrfs_scan_one_device(vol
->name
, FMODE_READ
,
2148 &btrfs_fs_type
, &fs_devices
);
2150 case BTRFS_IOC_DEVICES_READY
:
2151 ret
= btrfs_scan_one_device(vol
->name
, FMODE_READ
,
2152 &btrfs_fs_type
, &fs_devices
);
2155 ret
= !(fs_devices
->num_devices
== fs_devices
->total_devices
);
2163 static int btrfs_freeze(struct super_block
*sb
)
2165 struct btrfs_trans_handle
*trans
;
2166 struct btrfs_root
*root
= btrfs_sb(sb
)->tree_root
;
2168 trans
= btrfs_attach_transaction_barrier(root
);
2169 if (IS_ERR(trans
)) {
2170 /* no transaction, don't bother */
2171 if (PTR_ERR(trans
) == -ENOENT
)
2173 return PTR_ERR(trans
);
2175 return btrfs_commit_transaction(trans
, root
);
2178 static int btrfs_show_devname(struct seq_file
*m
, struct dentry
*root
)
2180 struct btrfs_fs_info
*fs_info
= btrfs_sb(root
->d_sb
);
2181 struct btrfs_fs_devices
*cur_devices
;
2182 struct btrfs_device
*dev
, *first_dev
= NULL
;
2183 struct list_head
*head
;
2184 struct rcu_string
*name
;
2186 mutex_lock(&fs_info
->fs_devices
->device_list_mutex
);
2187 cur_devices
= fs_info
->fs_devices
;
2188 while (cur_devices
) {
2189 head
= &cur_devices
->devices
;
2190 list_for_each_entry(dev
, head
, dev_list
) {
2195 if (!first_dev
|| dev
->devid
< first_dev
->devid
)
2198 cur_devices
= cur_devices
->seed
;
2203 name
= rcu_dereference(first_dev
->name
);
2204 seq_escape(m
, name
->str
, " \t\n\\");
2209 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
2213 static const struct super_operations btrfs_super_ops
= {
2214 .drop_inode
= btrfs_drop_inode
,
2215 .evict_inode
= btrfs_evict_inode
,
2216 .put_super
= btrfs_put_super
,
2217 .sync_fs
= btrfs_sync_fs
,
2218 .show_options
= btrfs_show_options
,
2219 .show_devname
= btrfs_show_devname
,
2220 .write_inode
= btrfs_write_inode
,
2221 .alloc_inode
= btrfs_alloc_inode
,
2222 .destroy_inode
= btrfs_destroy_inode
,
2223 .statfs
= btrfs_statfs
,
2224 .remount_fs
= btrfs_remount
,
2225 .freeze_fs
= btrfs_freeze
,
2228 static const struct file_operations btrfs_ctl_fops
= {
2229 .open
= btrfs_control_open
,
2230 .unlocked_ioctl
= btrfs_control_ioctl
,
2231 .compat_ioctl
= btrfs_control_ioctl
,
2232 .owner
= THIS_MODULE
,
2233 .llseek
= noop_llseek
,
2236 static struct miscdevice btrfs_misc
= {
2237 .minor
= BTRFS_MINOR
,
2238 .name
= "btrfs-control",
2239 .fops
= &btrfs_ctl_fops
2242 MODULE_ALIAS_MISCDEV(BTRFS_MINOR
);
2243 MODULE_ALIAS("devname:btrfs-control");
2245 static int btrfs_interface_init(void)
2247 return misc_register(&btrfs_misc
);
2250 static void btrfs_interface_exit(void)
2252 misc_deregister(&btrfs_misc
);
2255 static void btrfs_print_info(void)
2257 printk(KERN_INFO
"Btrfs loaded"
2258 #ifdef CONFIG_BTRFS_DEBUG
2261 #ifdef CONFIG_BTRFS_ASSERT
2264 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
2265 ", integrity-checker=on"
2270 static int btrfs_run_sanity_tests(void)
2274 ret
= btrfs_init_test_fs();
2278 ret
= btrfs_test_free_space_cache();
2281 ret
= btrfs_test_extent_buffer_operations();
2284 ret
= btrfs_test_extent_io();
2287 ret
= btrfs_test_inodes();
2290 ret
= btrfs_test_qgroups();
2293 ret
= btrfs_test_free_space_tree();
2295 btrfs_destroy_test_fs();
2299 static int __init
init_btrfs_fs(void)
2303 err
= btrfs_hash_init();
2309 err
= btrfs_init_sysfs();
2313 btrfs_init_compress();
2315 err
= btrfs_init_cachep();
2319 err
= extent_io_init();
2323 err
= extent_map_init();
2325 goto free_extent_io
;
2327 err
= ordered_data_init();
2329 goto free_extent_map
;
2331 err
= btrfs_delayed_inode_init();
2333 goto free_ordered_data
;
2335 err
= btrfs_auto_defrag_init();
2337 goto free_delayed_inode
;
2339 err
= btrfs_delayed_ref_init();
2341 goto free_auto_defrag
;
2343 err
= btrfs_prelim_ref_init();
2345 goto free_delayed_ref
;
2347 err
= btrfs_end_io_wq_init();
2349 goto free_prelim_ref
;
2351 err
= btrfs_interface_init();
2353 goto free_end_io_wq
;
2355 btrfs_init_lockdep();
2359 err
= btrfs_run_sanity_tests();
2361 goto unregister_ioctl
;
2363 err
= register_filesystem(&btrfs_fs_type
);
2365 goto unregister_ioctl
;
2370 btrfs_interface_exit();
2372 btrfs_end_io_wq_exit();
2374 btrfs_prelim_ref_exit();
2376 btrfs_delayed_ref_exit();
2378 btrfs_auto_defrag_exit();
2380 btrfs_delayed_inode_exit();
2382 ordered_data_exit();
2388 btrfs_destroy_cachep();
2390 btrfs_exit_compress();
2397 static void __exit
exit_btrfs_fs(void)
2399 btrfs_destroy_cachep();
2400 btrfs_delayed_ref_exit();
2401 btrfs_auto_defrag_exit();
2402 btrfs_delayed_inode_exit();
2403 btrfs_prelim_ref_exit();
2404 ordered_data_exit();
2407 btrfs_interface_exit();
2408 btrfs_end_io_wq_exit();
2409 unregister_filesystem(&btrfs_fs_type
);
2411 btrfs_cleanup_fs_uuids();
2412 btrfs_exit_compress();
2416 late_initcall(init_btrfs_fs
);
2417 module_exit(exit_btrfs_fs
)
2419 MODULE_LICENSE("GPL");