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>
45 #include "delayed-inode.h"
48 #include "transaction.h"
49 #include "btrfs_inode.h"
51 #include "print-tree.h"
56 #include "compression.h"
57 #include "rcu-string.h"
59 #define CREATE_TRACE_POINTS
60 #include <trace/events/btrfs.h>
62 static const struct super_operations btrfs_super_ops
;
63 static struct file_system_type btrfs_fs_type
;
65 static const char *btrfs_decode_error(struct btrfs_fs_info
*fs_info
, int errno
,
72 errstr
= "IO failure";
75 errstr
= "Out of memory";
78 errstr
= "Readonly filesystem";
81 errstr
= "Object already exists";
85 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
94 static void __save_error_info(struct btrfs_fs_info
*fs_info
)
97 * today we only save the error info into ram. Long term we'll
98 * also send it down to the disk
100 fs_info
->fs_state
= BTRFS_SUPER_FLAG_ERROR
;
104 * We move write_super stuff at umount in order to avoid deadlock
105 * for umount hold all lock.
107 static void save_error_info(struct btrfs_fs_info
*fs_info
)
109 __save_error_info(fs_info
);
112 /* btrfs handle error by forcing the filesystem readonly */
113 static void btrfs_handle_error(struct btrfs_fs_info
*fs_info
)
115 struct super_block
*sb
= fs_info
->sb
;
117 if (sb
->s_flags
& MS_RDONLY
)
120 if (fs_info
->fs_state
& BTRFS_SUPER_FLAG_ERROR
) {
121 sb
->s_flags
|= MS_RDONLY
;
122 printk(KERN_INFO
"btrfs is forced readonly\n");
123 __btrfs_scrub_cancel(fs_info
);
130 * __btrfs_std_error decodes expected errors from the caller and
131 * invokes the approciate error response.
133 void __btrfs_std_error(struct btrfs_fs_info
*fs_info
, const char *function
,
134 unsigned int line
, int errno
, const char *fmt
, ...)
136 struct super_block
*sb
= fs_info
->sb
;
143 * Special case: if the error is EROFS, and we're already
144 * under MS_RDONLY, then it is safe here.
146 if (errno
== -EROFS
&& (sb
->s_flags
& MS_RDONLY
))
149 errstr
= btrfs_decode_error(fs_info
, errno
, nbuf
);
151 struct va_format vaf
= {
156 printk(KERN_CRIT
"BTRFS error (device %s) in %s:%d: %s (%pV)\n",
157 sb
->s_id
, function
, line
, errstr
, &vaf
);
159 printk(KERN_CRIT
"BTRFS error (device %s) in %s:%d: %s\n",
160 sb
->s_id
, function
, line
, errstr
);
163 /* Don't go through full error handling during mount */
164 if (sb
->s_flags
& MS_BORN
) {
165 save_error_info(fs_info
);
166 btrfs_handle_error(fs_info
);
171 static const char * const logtypes
[] = {
182 void btrfs_printk(struct btrfs_fs_info
*fs_info
, const char *fmt
, ...)
184 struct super_block
*sb
= fs_info
->sb
;
186 struct va_format vaf
;
188 const char *type
= logtypes
[4];
193 kern_level
= printk_get_level(fmt
);
195 size_t size
= printk_skip_level(fmt
) - fmt
;
196 memcpy(lvl
, fmt
, size
);
199 type
= logtypes
[kern_level
- '0'];
206 printk("%sBTRFS %s (device %s): %pV", lvl
, type
, sb
->s_id
, &vaf
);
213 void __btrfs_std_error(struct btrfs_fs_info
*fs_info
, const char *function
,
214 unsigned int line
, int errno
, const char *fmt
, ...)
216 struct super_block
*sb
= fs_info
->sb
;
219 * Special case: if the error is EROFS, and we're already
220 * under MS_RDONLY, then it is safe here.
222 if (errno
== -EROFS
&& (sb
->s_flags
& MS_RDONLY
))
225 /* Don't go through full error handling during mount */
226 if (sb
->s_flags
& MS_BORN
) {
227 save_error_info(fs_info
);
228 btrfs_handle_error(fs_info
);
234 * We only mark the transaction aborted and then set the file system read-only.
235 * This will prevent new transactions from starting or trying to join this
238 * This means that error recovery at the call site is limited to freeing
239 * any local memory allocations and passing the error code up without
240 * further cleanup. The transaction should complete as it normally would
241 * in the call path but will return -EIO.
243 * We'll complete the cleanup in btrfs_end_transaction and
244 * btrfs_commit_transaction.
246 void __btrfs_abort_transaction(struct btrfs_trans_handle
*trans
,
247 struct btrfs_root
*root
, const char *function
,
248 unsigned int line
, int errno
)
250 WARN_ONCE(1, KERN_DEBUG
"btrfs: Transaction aborted");
251 trans
->aborted
= errno
;
252 /* Nothing used. The other threads that have joined this
253 * transaction may be able to continue. */
254 if (!trans
->blocks_used
) {
255 btrfs_printk(root
->fs_info
, "Aborting unused transaction.\n");
258 trans
->transaction
->aborted
= errno
;
259 __btrfs_std_error(root
->fs_info
, function
, line
, errno
, NULL
);
262 * __btrfs_panic decodes unexpected, fatal errors from the caller,
263 * issues an alert, and either panics or BUGs, depending on mount options.
265 void __btrfs_panic(struct btrfs_fs_info
*fs_info
, const char *function
,
266 unsigned int line
, int errno
, const char *fmt
, ...)
269 char *s_id
= "<unknown>";
271 struct va_format vaf
= { .fmt
= fmt
};
275 s_id
= fs_info
->sb
->s_id
;
280 errstr
= btrfs_decode_error(fs_info
, errno
, nbuf
);
281 if (fs_info
->mount_opt
& BTRFS_MOUNT_PANIC_ON_FATAL_ERROR
)
282 panic(KERN_CRIT
"BTRFS panic (device %s) in %s:%d: %pV (%s)\n",
283 s_id
, function
, line
, &vaf
, errstr
);
285 printk(KERN_CRIT
"BTRFS panic (device %s) in %s:%d: %pV (%s)\n",
286 s_id
, function
, line
, &vaf
, errstr
);
288 /* Caller calls BUG() */
291 static void btrfs_put_super(struct super_block
*sb
)
293 (void)close_ctree(btrfs_sb(sb
)->tree_root
);
294 /* FIXME: need to fix VFS to return error? */
295 /* AV: return it _where_? ->put_super() can be triggered by any number
296 * of async events, up to and including delivery of SIGKILL to the
297 * last process that kept it busy. Or segfault in the aforementioned
298 * process... Whom would you report that to?
303 Opt_degraded
, Opt_subvol
, Opt_subvolid
, Opt_device
, Opt_nodatasum
,
304 Opt_nodatacow
, Opt_max_inline
, Opt_alloc_start
, Opt_nobarrier
, Opt_ssd
,
305 Opt_nossd
, Opt_ssd_spread
, Opt_thread_pool
, Opt_noacl
, Opt_compress
,
306 Opt_compress_type
, Opt_compress_force
, Opt_compress_force_type
,
307 Opt_notreelog
, Opt_ratio
, Opt_flushoncommit
, Opt_discard
,
308 Opt_space_cache
, Opt_clear_cache
, Opt_user_subvol_rm_allowed
,
309 Opt_enospc_debug
, Opt_subvolrootid
, Opt_defrag
, Opt_inode_cache
,
310 Opt_no_space_cache
, Opt_recovery
, Opt_skip_balance
,
311 Opt_check_integrity
, Opt_check_integrity_including_extent_data
,
312 Opt_check_integrity_print_mask
, Opt_fatal_errors
,
316 static match_table_t tokens
= {
317 {Opt_degraded
, "degraded"},
318 {Opt_subvol
, "subvol=%s"},
319 {Opt_subvolid
, "subvolid=%d"},
320 {Opt_device
, "device=%s"},
321 {Opt_nodatasum
, "nodatasum"},
322 {Opt_nodatacow
, "nodatacow"},
323 {Opt_nobarrier
, "nobarrier"},
324 {Opt_max_inline
, "max_inline=%s"},
325 {Opt_alloc_start
, "alloc_start=%s"},
326 {Opt_thread_pool
, "thread_pool=%d"},
327 {Opt_compress
, "compress"},
328 {Opt_compress_type
, "compress=%s"},
329 {Opt_compress_force
, "compress-force"},
330 {Opt_compress_force_type
, "compress-force=%s"},
332 {Opt_ssd_spread
, "ssd_spread"},
333 {Opt_nossd
, "nossd"},
334 {Opt_noacl
, "noacl"},
335 {Opt_notreelog
, "notreelog"},
336 {Opt_flushoncommit
, "flushoncommit"},
337 {Opt_ratio
, "metadata_ratio=%d"},
338 {Opt_discard
, "discard"},
339 {Opt_space_cache
, "space_cache"},
340 {Opt_clear_cache
, "clear_cache"},
341 {Opt_user_subvol_rm_allowed
, "user_subvol_rm_allowed"},
342 {Opt_enospc_debug
, "enospc_debug"},
343 {Opt_subvolrootid
, "subvolrootid=%d"},
344 {Opt_defrag
, "autodefrag"},
345 {Opt_inode_cache
, "inode_cache"},
346 {Opt_no_space_cache
, "nospace_cache"},
347 {Opt_recovery
, "recovery"},
348 {Opt_skip_balance
, "skip_balance"},
349 {Opt_check_integrity
, "check_int"},
350 {Opt_check_integrity_including_extent_data
, "check_int_data"},
351 {Opt_check_integrity_print_mask
, "check_int_print_mask=%d"},
352 {Opt_fatal_errors
, "fatal_errors=%s"},
357 * Regular mount options parser. Everything that is needed only when
358 * reading in a new superblock is parsed here.
359 * XXX JDM: This needs to be cleaned up for remount.
361 int btrfs_parse_options(struct btrfs_root
*root
, char *options
)
363 struct btrfs_fs_info
*info
= root
->fs_info
;
364 substring_t args
[MAX_OPT_ARGS
];
365 char *p
, *num
, *orig
= NULL
;
370 bool compress_force
= false;
372 cache_gen
= btrfs_super_cache_generation(root
->fs_info
->super_copy
);
374 btrfs_set_opt(info
->mount_opt
, SPACE_CACHE
);
380 * strsep changes the string, duplicate it because parse_options
383 options
= kstrdup(options
, GFP_NOFS
);
389 while ((p
= strsep(&options
, ",")) != NULL
) {
394 token
= match_token(p
, tokens
, args
);
397 printk(KERN_INFO
"btrfs: allowing degraded mounts\n");
398 btrfs_set_opt(info
->mount_opt
, DEGRADED
);
402 case Opt_subvolrootid
:
405 * These are parsed by btrfs_parse_early_options
406 * and can be happily ignored here.
410 printk(KERN_INFO
"btrfs: setting nodatasum\n");
411 btrfs_set_opt(info
->mount_opt
, NODATASUM
);
414 printk(KERN_INFO
"btrfs: setting nodatacow\n");
415 btrfs_set_opt(info
->mount_opt
, NODATACOW
);
416 btrfs_set_opt(info
->mount_opt
, NODATASUM
);
418 case Opt_compress_force
:
419 case Opt_compress_force_type
:
420 compress_force
= true;
422 case Opt_compress_type
:
423 if (token
== Opt_compress
||
424 token
== Opt_compress_force
||
425 strcmp(args
[0].from
, "zlib") == 0) {
426 compress_type
= "zlib";
427 info
->compress_type
= BTRFS_COMPRESS_ZLIB
;
428 btrfs_set_opt(info
->mount_opt
, COMPRESS
);
429 } else if (strcmp(args
[0].from
, "lzo") == 0) {
430 compress_type
= "lzo";
431 info
->compress_type
= BTRFS_COMPRESS_LZO
;
432 btrfs_set_opt(info
->mount_opt
, COMPRESS
);
433 btrfs_set_fs_incompat(info
, COMPRESS_LZO
);
434 } else if (strncmp(args
[0].from
, "no", 2) == 0) {
435 compress_type
= "no";
436 info
->compress_type
= BTRFS_COMPRESS_NONE
;
437 btrfs_clear_opt(info
->mount_opt
, COMPRESS
);
438 btrfs_clear_opt(info
->mount_opt
, FORCE_COMPRESS
);
439 compress_force
= false;
445 if (compress_force
) {
446 btrfs_set_opt(info
->mount_opt
, FORCE_COMPRESS
);
447 pr_info("btrfs: force %s compression\n",
450 pr_info("btrfs: use %s compression\n",
454 printk(KERN_INFO
"btrfs: use ssd allocation scheme\n");
455 btrfs_set_opt(info
->mount_opt
, SSD
);
458 printk(KERN_INFO
"btrfs: use spread ssd "
459 "allocation scheme\n");
460 btrfs_set_opt(info
->mount_opt
, SSD
);
461 btrfs_set_opt(info
->mount_opt
, SSD_SPREAD
);
464 printk(KERN_INFO
"btrfs: not using ssd allocation "
466 btrfs_set_opt(info
->mount_opt
, NOSSD
);
467 btrfs_clear_opt(info
->mount_opt
, SSD
);
468 btrfs_clear_opt(info
->mount_opt
, SSD_SPREAD
);
471 printk(KERN_INFO
"btrfs: turning off barriers\n");
472 btrfs_set_opt(info
->mount_opt
, NOBARRIER
);
474 case Opt_thread_pool
:
476 match_int(&args
[0], &intarg
);
478 info
->thread_pool_size
= intarg
;
481 num
= match_strdup(&args
[0]);
483 info
->max_inline
= memparse(num
, NULL
);
486 if (info
->max_inline
) {
487 info
->max_inline
= max_t(u64
,
491 printk(KERN_INFO
"btrfs: max_inline at %llu\n",
492 (unsigned long long)info
->max_inline
);
495 case Opt_alloc_start
:
496 num
= match_strdup(&args
[0]);
498 info
->alloc_start
= memparse(num
, NULL
);
501 "btrfs: allocations start at %llu\n",
502 (unsigned long long)info
->alloc_start
);
506 root
->fs_info
->sb
->s_flags
&= ~MS_POSIXACL
;
509 printk(KERN_INFO
"btrfs: disabling tree log\n");
510 btrfs_set_opt(info
->mount_opt
, NOTREELOG
);
512 case Opt_flushoncommit
:
513 printk(KERN_INFO
"btrfs: turning on flush-on-commit\n");
514 btrfs_set_opt(info
->mount_opt
, FLUSHONCOMMIT
);
518 match_int(&args
[0], &intarg
);
520 info
->metadata_ratio
= intarg
;
521 printk(KERN_INFO
"btrfs: metadata ratio %d\n",
522 info
->metadata_ratio
);
526 btrfs_set_opt(info
->mount_opt
, DISCARD
);
528 case Opt_space_cache
:
529 btrfs_set_opt(info
->mount_opt
, SPACE_CACHE
);
531 case Opt_no_space_cache
:
532 printk(KERN_INFO
"btrfs: disabling disk space caching\n");
533 btrfs_clear_opt(info
->mount_opt
, SPACE_CACHE
);
535 case Opt_inode_cache
:
536 printk(KERN_INFO
"btrfs: enabling inode map caching\n");
537 btrfs_set_opt(info
->mount_opt
, INODE_MAP_CACHE
);
539 case Opt_clear_cache
:
540 printk(KERN_INFO
"btrfs: force clearing of disk cache\n");
541 btrfs_set_opt(info
->mount_opt
, CLEAR_CACHE
);
543 case Opt_user_subvol_rm_allowed
:
544 btrfs_set_opt(info
->mount_opt
, USER_SUBVOL_RM_ALLOWED
);
546 case Opt_enospc_debug
:
547 btrfs_set_opt(info
->mount_opt
, ENOSPC_DEBUG
);
550 printk(KERN_INFO
"btrfs: enabling auto defrag");
551 btrfs_set_opt(info
->mount_opt
, AUTO_DEFRAG
);
554 printk(KERN_INFO
"btrfs: enabling auto recovery");
555 btrfs_set_opt(info
->mount_opt
, RECOVERY
);
557 case Opt_skip_balance
:
558 btrfs_set_opt(info
->mount_opt
, SKIP_BALANCE
);
560 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
561 case Opt_check_integrity_including_extent_data
:
562 printk(KERN_INFO
"btrfs: enabling check integrity"
563 " including extent data\n");
564 btrfs_set_opt(info
->mount_opt
,
565 CHECK_INTEGRITY_INCLUDING_EXTENT_DATA
);
566 btrfs_set_opt(info
->mount_opt
, CHECK_INTEGRITY
);
568 case Opt_check_integrity
:
569 printk(KERN_INFO
"btrfs: enabling check integrity\n");
570 btrfs_set_opt(info
->mount_opt
, CHECK_INTEGRITY
);
572 case Opt_check_integrity_print_mask
:
574 match_int(&args
[0], &intarg
);
576 info
->check_integrity_print_mask
= intarg
;
577 printk(KERN_INFO
"btrfs:"
578 " check_integrity_print_mask 0x%x\n",
579 info
->check_integrity_print_mask
);
583 case Opt_check_integrity_including_extent_data
:
584 case Opt_check_integrity
:
585 case Opt_check_integrity_print_mask
:
586 printk(KERN_ERR
"btrfs: support for check_integrity*"
587 " not compiled in!\n");
591 case Opt_fatal_errors
:
592 if (strcmp(args
[0].from
, "panic") == 0)
593 btrfs_set_opt(info
->mount_opt
,
594 PANIC_ON_FATAL_ERROR
);
595 else if (strcmp(args
[0].from
, "bug") == 0)
596 btrfs_clear_opt(info
->mount_opt
,
597 PANIC_ON_FATAL_ERROR
);
604 printk(KERN_INFO
"btrfs: unrecognized mount option "
613 if (!ret
&& btrfs_test_opt(root
, SPACE_CACHE
))
614 printk(KERN_INFO
"btrfs: disk space caching is enabled\n");
620 * Parse mount options that are required early in the mount process.
622 * All other options will be parsed on much later in the mount process and
623 * only when we need to allocate a new super block.
625 static int btrfs_parse_early_options(const char *options
, fmode_t flags
,
626 void *holder
, char **subvol_name
, u64
*subvol_objectid
,
627 u64
*subvol_rootid
, struct btrfs_fs_devices
**fs_devices
)
629 substring_t args
[MAX_OPT_ARGS
];
630 char *device_name
, *opts
, *orig
, *p
;
638 * strsep changes the string, duplicate it because parse_options
641 opts
= kstrdup(options
, GFP_KERNEL
);
646 while ((p
= strsep(&opts
, ",")) != NULL
) {
651 token
= match_token(p
, tokens
, args
);
655 *subvol_name
= match_strdup(&args
[0]);
659 error
= match_int(&args
[0], &intarg
);
661 /* we want the original fs_tree */
664 BTRFS_FS_TREE_OBJECTID
;
666 *subvol_objectid
= intarg
;
669 case Opt_subvolrootid
:
671 error
= match_int(&args
[0], &intarg
);
673 /* we want the original fs_tree */
676 BTRFS_FS_TREE_OBJECTID
;
678 *subvol_rootid
= intarg
;
682 device_name
= match_strdup(&args
[0]);
687 error
= btrfs_scan_one_device(device_name
,
688 flags
, holder
, fs_devices
);
703 static struct dentry
*get_default_root(struct super_block
*sb
,
706 struct btrfs_fs_info
*fs_info
= btrfs_sb(sb
);
707 struct btrfs_root
*root
= fs_info
->tree_root
;
708 struct btrfs_root
*new_root
;
709 struct btrfs_dir_item
*di
;
710 struct btrfs_path
*path
;
711 struct btrfs_key location
;
717 * We have a specific subvol we want to mount, just setup location and
718 * go look up the root.
720 if (subvol_objectid
) {
721 location
.objectid
= subvol_objectid
;
722 location
.type
= BTRFS_ROOT_ITEM_KEY
;
723 location
.offset
= (u64
)-1;
727 path
= btrfs_alloc_path();
729 return ERR_PTR(-ENOMEM
);
730 path
->leave_spinning
= 1;
733 * Find the "default" dir item which points to the root item that we
734 * will mount by default if we haven't been given a specific subvolume
737 dir_id
= btrfs_super_root_dir(fs_info
->super_copy
);
738 di
= btrfs_lookup_dir_item(NULL
, root
, path
, dir_id
, "default", 7, 0);
740 btrfs_free_path(path
);
745 * Ok the default dir item isn't there. This is weird since
746 * it's always been there, but don't freak out, just try and
747 * mount to root most subvolume.
749 btrfs_free_path(path
);
750 dir_id
= BTRFS_FIRST_FREE_OBJECTID
;
751 new_root
= fs_info
->fs_root
;
755 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, &location
);
756 btrfs_free_path(path
);
759 new_root
= btrfs_read_fs_root_no_name(fs_info
, &location
);
760 if (IS_ERR(new_root
))
761 return ERR_CAST(new_root
);
763 if (btrfs_root_refs(&new_root
->root_item
) == 0)
764 return ERR_PTR(-ENOENT
);
766 dir_id
= btrfs_root_dirid(&new_root
->root_item
);
768 location
.objectid
= dir_id
;
769 location
.type
= BTRFS_INODE_ITEM_KEY
;
772 inode
= btrfs_iget(sb
, &location
, new_root
, &new);
774 return ERR_CAST(inode
);
777 * If we're just mounting the root most subvol put the inode and return
778 * a reference to the dentry. We will have already gotten a reference
779 * to the inode in btrfs_fill_super so we're good to go.
781 if (!new && sb
->s_root
->d_inode
== inode
) {
783 return dget(sb
->s_root
);
786 return d_obtain_alias(inode
);
789 static int btrfs_fill_super(struct super_block
*sb
,
790 struct btrfs_fs_devices
*fs_devices
,
791 void *data
, int silent
)
794 struct btrfs_fs_info
*fs_info
= btrfs_sb(sb
);
795 struct btrfs_key key
;
798 sb
->s_maxbytes
= MAX_LFS_FILESIZE
;
799 sb
->s_magic
= BTRFS_SUPER_MAGIC
;
800 sb
->s_op
= &btrfs_super_ops
;
801 sb
->s_d_op
= &btrfs_dentry_operations
;
802 sb
->s_export_op
= &btrfs_export_ops
;
803 sb
->s_xattr
= btrfs_xattr_handlers
;
805 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
806 sb
->s_flags
|= MS_POSIXACL
;
808 sb
->s_flags
|= MS_I_VERSION
;
809 err
= open_ctree(sb
, fs_devices
, (char *)data
);
811 printk("btrfs: open_ctree failed\n");
815 key
.objectid
= BTRFS_FIRST_FREE_OBJECTID
;
816 key
.type
= BTRFS_INODE_ITEM_KEY
;
818 inode
= btrfs_iget(sb
, &key
, fs_info
->fs_root
, NULL
);
820 err
= PTR_ERR(inode
);
824 sb
->s_root
= d_make_root(inode
);
830 save_mount_options(sb
, data
);
831 cleancache_init_fs(sb
);
832 sb
->s_flags
|= MS_ACTIVE
;
836 close_ctree(fs_info
->tree_root
);
840 int btrfs_sync_fs(struct super_block
*sb
, int wait
)
842 struct btrfs_trans_handle
*trans
;
843 struct btrfs_fs_info
*fs_info
= btrfs_sb(sb
);
844 struct btrfs_root
*root
= fs_info
->tree_root
;
847 trace_btrfs_sync_fs(wait
);
850 filemap_flush(fs_info
->btree_inode
->i_mapping
);
854 btrfs_wait_ordered_extents(root
, 0, 0);
856 trans
= btrfs_start_transaction(root
, 0);
858 return PTR_ERR(trans
);
859 ret
= btrfs_commit_transaction(trans
, root
);
863 static int btrfs_show_options(struct seq_file
*seq
, struct dentry
*dentry
)
865 struct btrfs_fs_info
*info
= btrfs_sb(dentry
->d_sb
);
866 struct btrfs_root
*root
= info
->tree_root
;
869 if (btrfs_test_opt(root
, DEGRADED
))
870 seq_puts(seq
, ",degraded");
871 if (btrfs_test_opt(root
, NODATASUM
))
872 seq_puts(seq
, ",nodatasum");
873 if (btrfs_test_opt(root
, NODATACOW
))
874 seq_puts(seq
, ",nodatacow");
875 if (btrfs_test_opt(root
, NOBARRIER
))
876 seq_puts(seq
, ",nobarrier");
877 if (info
->max_inline
!= 8192 * 1024)
878 seq_printf(seq
, ",max_inline=%llu",
879 (unsigned long long)info
->max_inline
);
880 if (info
->alloc_start
!= 0)
881 seq_printf(seq
, ",alloc_start=%llu",
882 (unsigned long long)info
->alloc_start
);
883 if (info
->thread_pool_size
!= min_t(unsigned long,
884 num_online_cpus() + 2, 8))
885 seq_printf(seq
, ",thread_pool=%d", info
->thread_pool_size
);
886 if (btrfs_test_opt(root
, COMPRESS
)) {
887 if (info
->compress_type
== BTRFS_COMPRESS_ZLIB
)
888 compress_type
= "zlib";
890 compress_type
= "lzo";
891 if (btrfs_test_opt(root
, FORCE_COMPRESS
))
892 seq_printf(seq
, ",compress-force=%s", compress_type
);
894 seq_printf(seq
, ",compress=%s", compress_type
);
896 if (btrfs_test_opt(root
, NOSSD
))
897 seq_puts(seq
, ",nossd");
898 if (btrfs_test_opt(root
, SSD_SPREAD
))
899 seq_puts(seq
, ",ssd_spread");
900 else if (btrfs_test_opt(root
, SSD
))
901 seq_puts(seq
, ",ssd");
902 if (btrfs_test_opt(root
, NOTREELOG
))
903 seq_puts(seq
, ",notreelog");
904 if (btrfs_test_opt(root
, FLUSHONCOMMIT
))
905 seq_puts(seq
, ",flushoncommit");
906 if (btrfs_test_opt(root
, DISCARD
))
907 seq_puts(seq
, ",discard");
908 if (!(root
->fs_info
->sb
->s_flags
& MS_POSIXACL
))
909 seq_puts(seq
, ",noacl");
910 if (btrfs_test_opt(root
, SPACE_CACHE
))
911 seq_puts(seq
, ",space_cache");
913 seq_puts(seq
, ",nospace_cache");
914 if (btrfs_test_opt(root
, CLEAR_CACHE
))
915 seq_puts(seq
, ",clear_cache");
916 if (btrfs_test_opt(root
, USER_SUBVOL_RM_ALLOWED
))
917 seq_puts(seq
, ",user_subvol_rm_allowed");
918 if (btrfs_test_opt(root
, ENOSPC_DEBUG
))
919 seq_puts(seq
, ",enospc_debug");
920 if (btrfs_test_opt(root
, AUTO_DEFRAG
))
921 seq_puts(seq
, ",autodefrag");
922 if (btrfs_test_opt(root
, INODE_MAP_CACHE
))
923 seq_puts(seq
, ",inode_cache");
924 if (btrfs_test_opt(root
, SKIP_BALANCE
))
925 seq_puts(seq
, ",skip_balance");
926 if (btrfs_test_opt(root
, PANIC_ON_FATAL_ERROR
))
927 seq_puts(seq
, ",fatal_errors=panic");
931 static int btrfs_test_super(struct super_block
*s
, void *data
)
933 struct btrfs_fs_info
*p
= data
;
934 struct btrfs_fs_info
*fs_info
= btrfs_sb(s
);
936 return fs_info
->fs_devices
== p
->fs_devices
;
939 static int btrfs_set_super(struct super_block
*s
, void *data
)
941 int err
= set_anon_super(s
, data
);
948 * subvolumes are identified by ino 256
950 static inline int is_subvolume_inode(struct inode
*inode
)
952 if (inode
&& inode
->i_ino
== BTRFS_FIRST_FREE_OBJECTID
)
958 * This will strip out the subvol=%s argument for an argument string and add
959 * subvolid=0 to make sure we get the actual tree root for path walking to the
962 static char *setup_root_args(char *args
)
964 unsigned len
= strlen(args
) + 2 + 1;
965 char *src
, *dst
, *buf
;
968 * We need the same args as before, but with this substitution:
969 * s!subvol=[^,]+!subvolid=0!
971 * Since the replacement string is up to 2 bytes longer than the
972 * original, allocate strlen(args) + 2 + 1 bytes.
975 src
= strstr(args
, "subvol=");
976 /* This shouldn't happen, but just in case.. */
980 buf
= dst
= kmalloc(len
, GFP_NOFS
);
985 * If the subvol= arg is not at the start of the string,
986 * copy whatever precedes it into buf.
994 strcpy(dst
, "subvolid=0");
995 dst
+= strlen("subvolid=0");
998 * If there is a "," after the original subvol=... string,
999 * copy that suffix into our buffer. Otherwise, we're done.
1001 src
= strchr(src
, ',');
1008 static struct dentry
*mount_subvol(const char *subvol_name
, int flags
,
1009 const char *device_name
, char *data
)
1011 struct dentry
*root
;
1012 struct vfsmount
*mnt
;
1015 newargs
= setup_root_args(data
);
1017 return ERR_PTR(-ENOMEM
);
1018 mnt
= vfs_kern_mount(&btrfs_fs_type
, flags
, device_name
,
1022 return ERR_CAST(mnt
);
1024 root
= mount_subtree(mnt
, subvol_name
);
1026 if (!IS_ERR(root
) && !is_subvolume_inode(root
->d_inode
)) {
1027 struct super_block
*s
= root
->d_sb
;
1029 root
= ERR_PTR(-EINVAL
);
1030 deactivate_locked_super(s
);
1031 printk(KERN_ERR
"btrfs: '%s' is not a valid subvolume\n",
1039 * Find a superblock for the given device / mount point.
1041 * Note: This is based on get_sb_bdev from fs/super.c with a few additions
1042 * for multiple device setup. Make sure to keep it in sync.
1044 static struct dentry
*btrfs_mount(struct file_system_type
*fs_type
, int flags
,
1045 const char *device_name
, void *data
)
1047 struct block_device
*bdev
= NULL
;
1048 struct super_block
*s
;
1049 struct dentry
*root
;
1050 struct btrfs_fs_devices
*fs_devices
= NULL
;
1051 struct btrfs_fs_info
*fs_info
= NULL
;
1052 fmode_t mode
= FMODE_READ
;
1053 char *subvol_name
= NULL
;
1054 u64 subvol_objectid
= 0;
1055 u64 subvol_rootid
= 0;
1058 if (!(flags
& MS_RDONLY
))
1059 mode
|= FMODE_WRITE
;
1061 error
= btrfs_parse_early_options(data
, mode
, fs_type
,
1062 &subvol_name
, &subvol_objectid
,
1063 &subvol_rootid
, &fs_devices
);
1066 return ERR_PTR(error
);
1070 root
= mount_subvol(subvol_name
, flags
, device_name
, data
);
1075 error
= btrfs_scan_one_device(device_name
, mode
, fs_type
, &fs_devices
);
1077 return ERR_PTR(error
);
1080 * Setup a dummy root and fs_info for test/set super. This is because
1081 * we don't actually fill this stuff out until open_ctree, but we need
1082 * it for searching for existing supers, so this lets us do that and
1083 * then open_ctree will properly initialize everything later.
1085 fs_info
= kzalloc(sizeof(struct btrfs_fs_info
), GFP_NOFS
);
1087 return ERR_PTR(-ENOMEM
);
1089 fs_info
->fs_devices
= fs_devices
;
1091 fs_info
->super_copy
= kzalloc(BTRFS_SUPER_INFO_SIZE
, GFP_NOFS
);
1092 fs_info
->super_for_commit
= kzalloc(BTRFS_SUPER_INFO_SIZE
, GFP_NOFS
);
1093 if (!fs_info
->super_copy
|| !fs_info
->super_for_commit
) {
1098 error
= btrfs_open_devices(fs_devices
, mode
, fs_type
);
1102 if (!(flags
& MS_RDONLY
) && fs_devices
->rw_devices
== 0) {
1104 goto error_close_devices
;
1107 bdev
= fs_devices
->latest_bdev
;
1108 s
= sget(fs_type
, btrfs_test_super
, btrfs_set_super
, flags
| MS_NOSEC
,
1112 goto error_close_devices
;
1116 btrfs_close_devices(fs_devices
);
1117 free_fs_info(fs_info
);
1118 if ((flags
^ s
->s_flags
) & MS_RDONLY
)
1121 char b
[BDEVNAME_SIZE
];
1123 strlcpy(s
->s_id
, bdevname(bdev
, b
), sizeof(s
->s_id
));
1124 btrfs_sb(s
)->bdev_holder
= fs_type
;
1125 error
= btrfs_fill_super(s
, fs_devices
, data
,
1126 flags
& MS_SILENT
? 1 : 0);
1129 root
= !error
? get_default_root(s
, subvol_objectid
) : ERR_PTR(error
);
1131 deactivate_locked_super(s
);
1135 error_close_devices
:
1136 btrfs_close_devices(fs_devices
);
1138 free_fs_info(fs_info
);
1139 return ERR_PTR(error
);
1142 static void btrfs_set_max_workers(struct btrfs_workers
*workers
, int new_limit
)
1144 spin_lock_irq(&workers
->lock
);
1145 workers
->max_workers
= new_limit
;
1146 spin_unlock_irq(&workers
->lock
);
1149 static void btrfs_resize_thread_pool(struct btrfs_fs_info
*fs_info
,
1150 int new_pool_size
, int old_pool_size
)
1152 if (new_pool_size
== old_pool_size
)
1155 fs_info
->thread_pool_size
= new_pool_size
;
1157 printk(KERN_INFO
"btrfs: resize thread pool %d -> %d\n",
1158 old_pool_size
, new_pool_size
);
1160 btrfs_set_max_workers(&fs_info
->generic_worker
, new_pool_size
);
1161 btrfs_set_max_workers(&fs_info
->workers
, new_pool_size
);
1162 btrfs_set_max_workers(&fs_info
->delalloc_workers
, new_pool_size
);
1163 btrfs_set_max_workers(&fs_info
->submit_workers
, new_pool_size
);
1164 btrfs_set_max_workers(&fs_info
->caching_workers
, new_pool_size
);
1165 btrfs_set_max_workers(&fs_info
->fixup_workers
, new_pool_size
);
1166 btrfs_set_max_workers(&fs_info
->endio_workers
, new_pool_size
);
1167 btrfs_set_max_workers(&fs_info
->endio_meta_workers
, new_pool_size
);
1168 btrfs_set_max_workers(&fs_info
->endio_meta_write_workers
, new_pool_size
);
1169 btrfs_set_max_workers(&fs_info
->endio_write_workers
, new_pool_size
);
1170 btrfs_set_max_workers(&fs_info
->endio_freespace_worker
, new_pool_size
);
1171 btrfs_set_max_workers(&fs_info
->delayed_workers
, new_pool_size
);
1172 btrfs_set_max_workers(&fs_info
->readahead_workers
, new_pool_size
);
1173 btrfs_set_max_workers(&fs_info
->scrub_workers
, new_pool_size
);
1176 static int btrfs_remount(struct super_block
*sb
, int *flags
, char *data
)
1178 struct btrfs_fs_info
*fs_info
= btrfs_sb(sb
);
1179 struct btrfs_root
*root
= fs_info
->tree_root
;
1180 unsigned old_flags
= sb
->s_flags
;
1181 unsigned long old_opts
= fs_info
->mount_opt
;
1182 unsigned long old_compress_type
= fs_info
->compress_type
;
1183 u64 old_max_inline
= fs_info
->max_inline
;
1184 u64 old_alloc_start
= fs_info
->alloc_start
;
1185 int old_thread_pool_size
= fs_info
->thread_pool_size
;
1186 unsigned int old_metadata_ratio
= fs_info
->metadata_ratio
;
1189 ret
= btrfs_parse_options(root
, data
);
1195 btrfs_resize_thread_pool(fs_info
,
1196 fs_info
->thread_pool_size
, old_thread_pool_size
);
1198 if ((*flags
& MS_RDONLY
) == (sb
->s_flags
& MS_RDONLY
))
1201 if (*flags
& MS_RDONLY
) {
1202 sb
->s_flags
|= MS_RDONLY
;
1204 ret
= btrfs_commit_super(root
);
1208 if (fs_info
->fs_devices
->rw_devices
== 0) {
1213 if (btrfs_super_log_root(fs_info
->super_copy
) != 0) {
1218 ret
= btrfs_cleanup_fs_roots(fs_info
);
1222 /* recover relocation */
1223 ret
= btrfs_recover_relocation(root
);
1227 ret
= btrfs_resume_balance_async(fs_info
);
1231 sb
->s_flags
&= ~MS_RDONLY
;
1237 /* We've hit an error - don't reset MS_RDONLY */
1238 if (sb
->s_flags
& MS_RDONLY
)
1239 old_flags
|= MS_RDONLY
;
1240 sb
->s_flags
= old_flags
;
1241 fs_info
->mount_opt
= old_opts
;
1242 fs_info
->compress_type
= old_compress_type
;
1243 fs_info
->max_inline
= old_max_inline
;
1244 fs_info
->alloc_start
= old_alloc_start
;
1245 btrfs_resize_thread_pool(fs_info
,
1246 old_thread_pool_size
, fs_info
->thread_pool_size
);
1247 fs_info
->metadata_ratio
= old_metadata_ratio
;
1251 /* Used to sort the devices by max_avail(descending sort) */
1252 static int btrfs_cmp_device_free_bytes(const void *dev_info1
,
1253 const void *dev_info2
)
1255 if (((struct btrfs_device_info
*)dev_info1
)->max_avail
>
1256 ((struct btrfs_device_info
*)dev_info2
)->max_avail
)
1258 else if (((struct btrfs_device_info
*)dev_info1
)->max_avail
<
1259 ((struct btrfs_device_info
*)dev_info2
)->max_avail
)
1266 * sort the devices by max_avail, in which max free extent size of each device
1267 * is stored.(Descending Sort)
1269 static inline void btrfs_descending_sort_devices(
1270 struct btrfs_device_info
*devices
,
1273 sort(devices
, nr_devices
, sizeof(struct btrfs_device_info
),
1274 btrfs_cmp_device_free_bytes
, NULL
);
1278 * The helper to calc the free space on the devices that can be used to store
1281 static int btrfs_calc_avail_data_space(struct btrfs_root
*root
, u64
*free_bytes
)
1283 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1284 struct btrfs_device_info
*devices_info
;
1285 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
1286 struct btrfs_device
*device
;
1291 u64 min_stripe_size
;
1292 int min_stripes
= 1, num_stripes
= 1;
1293 int i
= 0, nr_devices
;
1296 nr_devices
= fs_info
->fs_devices
->open_devices
;
1297 BUG_ON(!nr_devices
);
1299 devices_info
= kmalloc(sizeof(*devices_info
) * nr_devices
,
1304 /* calc min stripe number for data space alloction */
1305 type
= btrfs_get_alloc_profile(root
, 1);
1306 if (type
& BTRFS_BLOCK_GROUP_RAID0
) {
1308 num_stripes
= nr_devices
;
1309 } else if (type
& BTRFS_BLOCK_GROUP_RAID1
) {
1312 } else if (type
& BTRFS_BLOCK_GROUP_RAID10
) {
1317 if (type
& BTRFS_BLOCK_GROUP_DUP
)
1318 min_stripe_size
= 2 * BTRFS_STRIPE_LEN
;
1320 min_stripe_size
= BTRFS_STRIPE_LEN
;
1322 list_for_each_entry(device
, &fs_devices
->devices
, dev_list
) {
1323 if (!device
->in_fs_metadata
|| !device
->bdev
)
1326 avail_space
= device
->total_bytes
- device
->bytes_used
;
1328 /* align with stripe_len */
1329 do_div(avail_space
, BTRFS_STRIPE_LEN
);
1330 avail_space
*= BTRFS_STRIPE_LEN
;
1333 * In order to avoid overwritting the superblock on the drive,
1334 * btrfs starts at an offset of at least 1MB when doing chunk
1337 skip_space
= 1024 * 1024;
1339 /* user can set the offset in fs_info->alloc_start. */
1340 if (fs_info
->alloc_start
+ BTRFS_STRIPE_LEN
<=
1341 device
->total_bytes
)
1342 skip_space
= max(fs_info
->alloc_start
, skip_space
);
1345 * btrfs can not use the free space in [0, skip_space - 1],
1346 * we must subtract it from the total. In order to implement
1347 * it, we account the used space in this range first.
1349 ret
= btrfs_account_dev_extents_size(device
, 0, skip_space
- 1,
1352 kfree(devices_info
);
1356 /* calc the free space in [0, skip_space - 1] */
1357 skip_space
-= used_space
;
1360 * we can use the free space in [0, skip_space - 1], subtract
1361 * it from the total.
1363 if (avail_space
&& avail_space
>= skip_space
)
1364 avail_space
-= skip_space
;
1368 if (avail_space
< min_stripe_size
)
1371 devices_info
[i
].dev
= device
;
1372 devices_info
[i
].max_avail
= avail_space
;
1379 btrfs_descending_sort_devices(devices_info
, nr_devices
);
1383 while (nr_devices
>= min_stripes
) {
1384 if (num_stripes
> nr_devices
)
1385 num_stripes
= nr_devices
;
1387 if (devices_info
[i
].max_avail
>= min_stripe_size
) {
1391 avail_space
+= devices_info
[i
].max_avail
* num_stripes
;
1392 alloc_size
= devices_info
[i
].max_avail
;
1393 for (j
= i
+ 1 - num_stripes
; j
<= i
; j
++)
1394 devices_info
[j
].max_avail
-= alloc_size
;
1400 kfree(devices_info
);
1401 *free_bytes
= avail_space
;
1405 static int btrfs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
1407 struct btrfs_fs_info
*fs_info
= btrfs_sb(dentry
->d_sb
);
1408 struct btrfs_super_block
*disk_super
= fs_info
->super_copy
;
1409 struct list_head
*head
= &fs_info
->space_info
;
1410 struct btrfs_space_info
*found
;
1412 u64 total_free_data
= 0;
1413 int bits
= dentry
->d_sb
->s_blocksize_bits
;
1414 __be32
*fsid
= (__be32
*)fs_info
->fsid
;
1417 /* holding chunk_muext to avoid allocating new chunks */
1418 mutex_lock(&fs_info
->chunk_mutex
);
1420 list_for_each_entry_rcu(found
, head
, list
) {
1421 if (found
->flags
& BTRFS_BLOCK_GROUP_DATA
) {
1422 total_free_data
+= found
->disk_total
- found
->disk_used
;
1424 btrfs_account_ro_block_groups_free_space(found
);
1427 total_used
+= found
->disk_used
;
1431 buf
->f_namelen
= BTRFS_NAME_LEN
;
1432 buf
->f_blocks
= btrfs_super_total_bytes(disk_super
) >> bits
;
1433 buf
->f_bfree
= buf
->f_blocks
- (total_used
>> bits
);
1434 buf
->f_bsize
= dentry
->d_sb
->s_blocksize
;
1435 buf
->f_type
= BTRFS_SUPER_MAGIC
;
1436 buf
->f_bavail
= total_free_data
;
1437 ret
= btrfs_calc_avail_data_space(fs_info
->tree_root
, &total_free_data
);
1439 mutex_unlock(&fs_info
->chunk_mutex
);
1442 buf
->f_bavail
+= total_free_data
;
1443 buf
->f_bavail
= buf
->f_bavail
>> bits
;
1444 mutex_unlock(&fs_info
->chunk_mutex
);
1446 /* We treat it as constant endianness (it doesn't matter _which_)
1447 because we want the fsid to come out the same whether mounted
1448 on a big-endian or little-endian host */
1449 buf
->f_fsid
.val
[0] = be32_to_cpu(fsid
[0]) ^ be32_to_cpu(fsid
[2]);
1450 buf
->f_fsid
.val
[1] = be32_to_cpu(fsid
[1]) ^ be32_to_cpu(fsid
[3]);
1451 /* Mask in the root object ID too, to disambiguate subvols */
1452 buf
->f_fsid
.val
[0] ^= BTRFS_I(dentry
->d_inode
)->root
->objectid
>> 32;
1453 buf
->f_fsid
.val
[1] ^= BTRFS_I(dentry
->d_inode
)->root
->objectid
;
1458 static void btrfs_kill_super(struct super_block
*sb
)
1460 struct btrfs_fs_info
*fs_info
= btrfs_sb(sb
);
1461 kill_anon_super(sb
);
1462 free_fs_info(fs_info
);
1465 static struct file_system_type btrfs_fs_type
= {
1466 .owner
= THIS_MODULE
,
1468 .mount
= btrfs_mount
,
1469 .kill_sb
= btrfs_kill_super
,
1470 .fs_flags
= FS_REQUIRES_DEV
,
1474 * used by btrfsctl to scan devices when no FS is mounted
1476 static long btrfs_control_ioctl(struct file
*file
, unsigned int cmd
,
1479 struct btrfs_ioctl_vol_args
*vol
;
1480 struct btrfs_fs_devices
*fs_devices
;
1483 if (!capable(CAP_SYS_ADMIN
))
1486 vol
= memdup_user((void __user
*)arg
, sizeof(*vol
));
1488 return PTR_ERR(vol
);
1491 case BTRFS_IOC_SCAN_DEV
:
1492 ret
= btrfs_scan_one_device(vol
->name
, FMODE_READ
,
1493 &btrfs_fs_type
, &fs_devices
);
1495 case BTRFS_IOC_DEVICES_READY
:
1496 ret
= btrfs_scan_one_device(vol
->name
, FMODE_READ
,
1497 &btrfs_fs_type
, &fs_devices
);
1500 ret
= !(fs_devices
->num_devices
== fs_devices
->total_devices
);
1508 static int btrfs_freeze(struct super_block
*sb
)
1510 struct btrfs_fs_info
*fs_info
= btrfs_sb(sb
);
1511 mutex_lock(&fs_info
->transaction_kthread_mutex
);
1512 mutex_lock(&fs_info
->cleaner_mutex
);
1516 static int btrfs_unfreeze(struct super_block
*sb
)
1518 struct btrfs_fs_info
*fs_info
= btrfs_sb(sb
);
1519 mutex_unlock(&fs_info
->cleaner_mutex
);
1520 mutex_unlock(&fs_info
->transaction_kthread_mutex
);
1524 static int btrfs_show_devname(struct seq_file
*m
, struct dentry
*root
)
1526 struct btrfs_fs_info
*fs_info
= btrfs_sb(root
->d_sb
);
1527 struct btrfs_fs_devices
*cur_devices
;
1528 struct btrfs_device
*dev
, *first_dev
= NULL
;
1529 struct list_head
*head
;
1530 struct rcu_string
*name
;
1532 mutex_lock(&fs_info
->fs_devices
->device_list_mutex
);
1533 cur_devices
= fs_info
->fs_devices
;
1534 while (cur_devices
) {
1535 head
= &cur_devices
->devices
;
1536 list_for_each_entry(dev
, head
, dev_list
) {
1537 if (!first_dev
|| dev
->devid
< first_dev
->devid
)
1540 cur_devices
= cur_devices
->seed
;
1545 name
= rcu_dereference(first_dev
->name
);
1546 seq_escape(m
, name
->str
, " \t\n\\");
1551 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
1555 static const struct super_operations btrfs_super_ops
= {
1556 .drop_inode
= btrfs_drop_inode
,
1557 .evict_inode
= btrfs_evict_inode
,
1558 .put_super
= btrfs_put_super
,
1559 .sync_fs
= btrfs_sync_fs
,
1560 .show_options
= btrfs_show_options
,
1561 .show_devname
= btrfs_show_devname
,
1562 .write_inode
= btrfs_write_inode
,
1563 .alloc_inode
= btrfs_alloc_inode
,
1564 .destroy_inode
= btrfs_destroy_inode
,
1565 .statfs
= btrfs_statfs
,
1566 .remount_fs
= btrfs_remount
,
1567 .freeze_fs
= btrfs_freeze
,
1568 .unfreeze_fs
= btrfs_unfreeze
,
1571 static const struct file_operations btrfs_ctl_fops
= {
1572 .unlocked_ioctl
= btrfs_control_ioctl
,
1573 .compat_ioctl
= btrfs_control_ioctl
,
1574 .owner
= THIS_MODULE
,
1575 .llseek
= noop_llseek
,
1578 static struct miscdevice btrfs_misc
= {
1579 .minor
= BTRFS_MINOR
,
1580 .name
= "btrfs-control",
1581 .fops
= &btrfs_ctl_fops
1584 MODULE_ALIAS_MISCDEV(BTRFS_MINOR
);
1585 MODULE_ALIAS("devname:btrfs-control");
1587 static int btrfs_interface_init(void)
1589 return misc_register(&btrfs_misc
);
1592 static void btrfs_interface_exit(void)
1594 if (misc_deregister(&btrfs_misc
) < 0)
1595 printk(KERN_INFO
"misc_deregister failed for control device");
1598 static int __init
init_btrfs_fs(void)
1602 err
= btrfs_init_sysfs();
1606 btrfs_init_compress();
1608 err
= btrfs_init_cachep();
1612 err
= extent_io_init();
1616 err
= extent_map_init();
1618 goto free_extent_io
;
1620 err
= btrfs_delayed_inode_init();
1622 goto free_extent_map
;
1624 err
= btrfs_interface_init();
1626 goto free_delayed_inode
;
1628 err
= register_filesystem(&btrfs_fs_type
);
1630 goto unregister_ioctl
;
1632 btrfs_init_lockdep();
1634 printk(KERN_INFO
"%s loaded\n", BTRFS_BUILD_VERSION
);
1638 btrfs_interface_exit();
1640 btrfs_delayed_inode_exit();
1646 btrfs_destroy_cachep();
1648 btrfs_exit_compress();
1653 static void __exit
exit_btrfs_fs(void)
1655 btrfs_destroy_cachep();
1656 btrfs_delayed_inode_exit();
1659 btrfs_interface_exit();
1660 unregister_filesystem(&btrfs_fs_type
);
1662 btrfs_cleanup_fs_uuids();
1663 btrfs_exit_compress();
1666 module_init(init_btrfs_fs
)
1667 module_exit(exit_btrfs_fs
)
1669 MODULE_LICENSE("GPL");