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>
44 #include "transaction.h"
45 #include "btrfs_inode.h"
47 #include "print-tree.h"
52 #include "compression.h"
54 static const struct super_operations btrfs_super_ops
;
56 static void btrfs_put_super(struct super_block
*sb
)
58 struct btrfs_root
*root
= btrfs_sb(sb
);
61 ret
= close_ctree(root
);
66 Opt_degraded
, Opt_subvol
, Opt_subvolid
, Opt_device
, Opt_nodatasum
,
67 Opt_nodatacow
, Opt_max_inline
, Opt_alloc_start
, Opt_nobarrier
, Opt_ssd
,
68 Opt_nossd
, Opt_ssd_spread
, Opt_thread_pool
, Opt_noacl
, Opt_compress
,
69 Opt_compress_force
, Opt_notreelog
, Opt_ratio
, Opt_flushoncommit
,
73 static match_table_t tokens
= {
74 {Opt_degraded
, "degraded"},
75 {Opt_subvol
, "subvol=%s"},
76 {Opt_subvolid
, "subvolid=%d"},
77 {Opt_device
, "device=%s"},
78 {Opt_nodatasum
, "nodatasum"},
79 {Opt_nodatacow
, "nodatacow"},
80 {Opt_nobarrier
, "nobarrier"},
81 {Opt_max_inline
, "max_inline=%s"},
82 {Opt_alloc_start
, "alloc_start=%s"},
83 {Opt_thread_pool
, "thread_pool=%d"},
84 {Opt_compress
, "compress"},
85 {Opt_compress_force
, "compress-force"},
87 {Opt_ssd_spread
, "ssd_spread"},
90 {Opt_notreelog
, "notreelog"},
91 {Opt_flushoncommit
, "flushoncommit"},
92 {Opt_ratio
, "metadata_ratio=%d"},
93 {Opt_discard
, "discard"},
98 * Regular mount options parser. Everything that is needed only when
99 * reading in a new superblock is parsed here.
101 int btrfs_parse_options(struct btrfs_root
*root
, char *options
)
103 struct btrfs_fs_info
*info
= root
->fs_info
;
104 substring_t args
[MAX_OPT_ARGS
];
105 char *p
, *num
, *orig
;
113 * strsep changes the string, duplicate it because parse_options
116 options
= kstrdup(options
, GFP_NOFS
);
122 while ((p
= strsep(&options
, ",")) != NULL
) {
127 token
= match_token(p
, tokens
, args
);
130 printk(KERN_INFO
"btrfs: allowing degraded mounts\n");
131 btrfs_set_opt(info
->mount_opt
, DEGRADED
);
137 * These are parsed by btrfs_parse_early_options
138 * and can be happily ignored here.
142 printk(KERN_INFO
"btrfs: setting nodatasum\n");
143 btrfs_set_opt(info
->mount_opt
, NODATASUM
);
146 printk(KERN_INFO
"btrfs: setting nodatacow\n");
147 btrfs_set_opt(info
->mount_opt
, NODATACOW
);
148 btrfs_set_opt(info
->mount_opt
, NODATASUM
);
151 printk(KERN_INFO
"btrfs: use compression\n");
152 btrfs_set_opt(info
->mount_opt
, COMPRESS
);
154 case Opt_compress_force
:
155 printk(KERN_INFO
"btrfs: forcing compression\n");
156 btrfs_set_opt(info
->mount_opt
, FORCE_COMPRESS
);
157 btrfs_set_opt(info
->mount_opt
, COMPRESS
);
160 printk(KERN_INFO
"btrfs: use ssd allocation scheme\n");
161 btrfs_set_opt(info
->mount_opt
, SSD
);
164 printk(KERN_INFO
"btrfs: use spread ssd "
165 "allocation scheme\n");
166 btrfs_set_opt(info
->mount_opt
, SSD
);
167 btrfs_set_opt(info
->mount_opt
, SSD_SPREAD
);
170 printk(KERN_INFO
"btrfs: not using ssd allocation "
172 btrfs_set_opt(info
->mount_opt
, NOSSD
);
173 btrfs_clear_opt(info
->mount_opt
, SSD
);
174 btrfs_clear_opt(info
->mount_opt
, SSD_SPREAD
);
177 printk(KERN_INFO
"btrfs: turning off barriers\n");
178 btrfs_set_opt(info
->mount_opt
, NOBARRIER
);
180 case Opt_thread_pool
:
182 match_int(&args
[0], &intarg
);
184 info
->thread_pool_size
= intarg
;
185 printk(KERN_INFO
"btrfs: thread pool %d\n",
186 info
->thread_pool_size
);
190 num
= match_strdup(&args
[0]);
192 info
->max_inline
= memparse(num
, NULL
);
195 if (info
->max_inline
) {
196 info
->max_inline
= max_t(u64
,
200 printk(KERN_INFO
"btrfs: max_inline at %llu\n",
201 (unsigned long long)info
->max_inline
);
204 case Opt_alloc_start
:
205 num
= match_strdup(&args
[0]);
207 info
->alloc_start
= memparse(num
, NULL
);
210 "btrfs: allocations start at %llu\n",
211 (unsigned long long)info
->alloc_start
);
215 root
->fs_info
->sb
->s_flags
&= ~MS_POSIXACL
;
218 printk(KERN_INFO
"btrfs: disabling tree log\n");
219 btrfs_set_opt(info
->mount_opt
, NOTREELOG
);
221 case Opt_flushoncommit
:
222 printk(KERN_INFO
"btrfs: turning on flush-on-commit\n");
223 btrfs_set_opt(info
->mount_opt
, FLUSHONCOMMIT
);
227 match_int(&args
[0], &intarg
);
229 info
->metadata_ratio
= intarg
;
230 printk(KERN_INFO
"btrfs: metadata ratio %d\n",
231 info
->metadata_ratio
);
235 btrfs_set_opt(info
->mount_opt
, DISCARD
);
238 printk(KERN_INFO
"btrfs: unrecognized mount option "
252 * Parse mount options that are required early in the mount process.
254 * All other options will be parsed on much later in the mount process and
255 * only when we need to allocate a new super block.
257 static int btrfs_parse_early_options(const char *options
, fmode_t flags
,
258 void *holder
, char **subvol_name
, u64
*subvol_objectid
,
259 struct btrfs_fs_devices
**fs_devices
)
261 substring_t args
[MAX_OPT_ARGS
];
270 * strsep changes the string, duplicate it because parse_options
273 opts
= kstrdup(options
, GFP_KERNEL
);
277 while ((p
= strsep(&opts
, ",")) != NULL
) {
282 token
= match_token(p
, tokens
, args
);
285 *subvol_name
= match_strdup(&args
[0]);
289 error
= match_int(&args
[0], &intarg
);
291 /* we want the original fs_tree */
294 BTRFS_FS_TREE_OBJECTID
;
296 *subvol_objectid
= intarg
;
300 error
= btrfs_scan_one_device(match_strdup(&args
[0]),
301 flags
, holder
, fs_devices
);
314 * If no subvolume name is specified we use the default one. Allocate
315 * a copy of the string "." here so that code later in the
316 * mount path doesn't care if it's the default volume or another one.
319 *subvol_name
= kstrdup(".", GFP_KERNEL
);
326 static struct dentry
*get_default_root(struct super_block
*sb
,
329 struct btrfs_root
*root
= sb
->s_fs_info
;
330 struct btrfs_root
*new_root
;
331 struct btrfs_dir_item
*di
;
332 struct btrfs_path
*path
;
333 struct btrfs_key location
;
335 struct dentry
*dentry
;
340 * We have a specific subvol we want to mount, just setup location and
341 * go look up the root.
343 if (subvol_objectid
) {
344 location
.objectid
= subvol_objectid
;
345 location
.type
= BTRFS_ROOT_ITEM_KEY
;
346 location
.offset
= (u64
)-1;
350 path
= btrfs_alloc_path();
352 return ERR_PTR(-ENOMEM
);
353 path
->leave_spinning
= 1;
356 * Find the "default" dir item which points to the root item that we
357 * will mount by default if we haven't been given a specific subvolume
360 dir_id
= btrfs_super_root_dir(&root
->fs_info
->super_copy
);
361 di
= btrfs_lookup_dir_item(NULL
, root
, path
, dir_id
, "default", 7, 0);
364 * Ok the default dir item isn't there. This is weird since
365 * it's always been there, but don't freak out, just try and
366 * mount to root most subvolume.
368 btrfs_free_path(path
);
369 dir_id
= BTRFS_FIRST_FREE_OBJECTID
;
370 new_root
= root
->fs_info
->fs_root
;
374 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, &location
);
375 btrfs_free_path(path
);
378 new_root
= btrfs_read_fs_root_no_name(root
->fs_info
, &location
);
379 if (IS_ERR(new_root
))
380 return ERR_PTR(PTR_ERR(new_root
));
382 if (btrfs_root_refs(&new_root
->root_item
) == 0)
383 return ERR_PTR(-ENOENT
);
385 dir_id
= btrfs_root_dirid(&new_root
->root_item
);
387 location
.objectid
= dir_id
;
388 location
.type
= BTRFS_INODE_ITEM_KEY
;
391 inode
= btrfs_iget(sb
, &location
, new_root
, &new);
393 return ERR_PTR(-ENOMEM
);
396 * If we're just mounting the root most subvol put the inode and return
397 * a reference to the dentry. We will have already gotten a reference
398 * to the inode in btrfs_fill_super so we're good to go.
400 if (!new && sb
->s_root
->d_inode
== inode
) {
402 return dget(sb
->s_root
);
406 const struct qstr name
= { .name
= "/", .len
= 1 };
409 * New inode, we need to make the dentry a sibling of s_root so
410 * everything gets cleaned up properly on unmount.
412 dentry
= d_alloc(sb
->s_root
, &name
);
415 return ERR_PTR(-ENOMEM
);
417 d_splice_alias(inode
, dentry
);
420 * We found the inode in cache, just find a dentry for it and
421 * put the reference to the inode we just got.
423 dentry
= d_find_alias(inode
);
430 static int btrfs_fill_super(struct super_block
*sb
,
431 struct btrfs_fs_devices
*fs_devices
,
432 void *data
, int silent
)
435 struct dentry
*root_dentry
;
436 struct btrfs_super_block
*disk_super
;
437 struct btrfs_root
*tree_root
;
438 struct btrfs_key key
;
441 sb
->s_maxbytes
= MAX_LFS_FILESIZE
;
442 sb
->s_magic
= BTRFS_SUPER_MAGIC
;
443 sb
->s_op
= &btrfs_super_ops
;
444 sb
->s_export_op
= &btrfs_export_ops
;
445 sb
->s_xattr
= btrfs_xattr_handlers
;
447 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
448 sb
->s_flags
|= MS_POSIXACL
;
451 tree_root
= open_ctree(sb
, fs_devices
, (char *)data
);
453 if (IS_ERR(tree_root
)) {
454 printk("btrfs: open_ctree failed\n");
455 return PTR_ERR(tree_root
);
457 sb
->s_fs_info
= tree_root
;
458 disk_super
= &tree_root
->fs_info
->super_copy
;
460 key
.objectid
= BTRFS_FIRST_FREE_OBJECTID
;
461 key
.type
= BTRFS_INODE_ITEM_KEY
;
463 inode
= btrfs_iget(sb
, &key
, tree_root
->fs_info
->fs_root
, NULL
);
465 err
= PTR_ERR(inode
);
469 root_dentry
= d_alloc_root(inode
);
476 sb
->s_root
= root_dentry
;
478 save_mount_options(sb
, data
);
482 close_ctree(tree_root
);
486 int btrfs_sync_fs(struct super_block
*sb
, int wait
)
488 struct btrfs_trans_handle
*trans
;
489 struct btrfs_root
*root
= btrfs_sb(sb
);
493 filemap_flush(root
->fs_info
->btree_inode
->i_mapping
);
497 btrfs_start_delalloc_inodes(root
, 0);
498 btrfs_wait_ordered_extents(root
, 0, 0);
500 trans
= btrfs_start_transaction(root
, 1);
501 ret
= btrfs_commit_transaction(trans
, root
);
505 static int btrfs_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
507 struct btrfs_root
*root
= btrfs_sb(vfs
->mnt_sb
);
508 struct btrfs_fs_info
*info
= root
->fs_info
;
510 if (btrfs_test_opt(root
, DEGRADED
))
511 seq_puts(seq
, ",degraded");
512 if (btrfs_test_opt(root
, NODATASUM
))
513 seq_puts(seq
, ",nodatasum");
514 if (btrfs_test_opt(root
, NODATACOW
))
515 seq_puts(seq
, ",nodatacow");
516 if (btrfs_test_opt(root
, NOBARRIER
))
517 seq_puts(seq
, ",nobarrier");
518 if (info
->max_inline
!= 8192 * 1024)
519 seq_printf(seq
, ",max_inline=%llu",
520 (unsigned long long)info
->max_inline
);
521 if (info
->alloc_start
!= 0)
522 seq_printf(seq
, ",alloc_start=%llu",
523 (unsigned long long)info
->alloc_start
);
524 if (info
->thread_pool_size
!= min_t(unsigned long,
525 num_online_cpus() + 2, 8))
526 seq_printf(seq
, ",thread_pool=%d", info
->thread_pool_size
);
527 if (btrfs_test_opt(root
, COMPRESS
))
528 seq_puts(seq
, ",compress");
529 if (btrfs_test_opt(root
, NOSSD
))
530 seq_puts(seq
, ",nossd");
531 if (btrfs_test_opt(root
, SSD_SPREAD
))
532 seq_puts(seq
, ",ssd_spread");
533 else if (btrfs_test_opt(root
, SSD
))
534 seq_puts(seq
, ",ssd");
535 if (btrfs_test_opt(root
, NOTREELOG
))
536 seq_puts(seq
, ",notreelog");
537 if (btrfs_test_opt(root
, FLUSHONCOMMIT
))
538 seq_puts(seq
, ",flushoncommit");
539 if (btrfs_test_opt(root
, DISCARD
))
540 seq_puts(seq
, ",discard");
541 if (!(root
->fs_info
->sb
->s_flags
& MS_POSIXACL
))
542 seq_puts(seq
, ",noacl");
546 static int btrfs_test_super(struct super_block
*s
, void *data
)
548 struct btrfs_fs_devices
*test_fs_devices
= data
;
549 struct btrfs_root
*root
= btrfs_sb(s
);
551 return root
->fs_info
->fs_devices
== test_fs_devices
;
555 * Find a superblock for the given device / mount point.
557 * Note: This is based on get_sb_bdev from fs/super.c with a few additions
558 * for multiple device setup. Make sure to keep it in sync.
560 static int btrfs_get_sb(struct file_system_type
*fs_type
, int flags
,
561 const char *dev_name
, void *data
, struct vfsmount
*mnt
)
563 struct block_device
*bdev
= NULL
;
564 struct super_block
*s
;
566 struct btrfs_fs_devices
*fs_devices
= NULL
;
567 fmode_t mode
= FMODE_READ
;
568 char *subvol_name
= NULL
;
569 u64 subvol_objectid
= 0;
573 if (!(flags
& MS_RDONLY
))
576 error
= btrfs_parse_early_options(data
, mode
, fs_type
,
577 &subvol_name
, &subvol_objectid
,
582 error
= btrfs_scan_one_device(dev_name
, mode
, fs_type
, &fs_devices
);
584 goto error_free_subvol_name
;
586 error
= btrfs_open_devices(fs_devices
, mode
, fs_type
);
588 goto error_free_subvol_name
;
590 if (!(flags
& MS_RDONLY
) && fs_devices
->rw_devices
== 0) {
592 goto error_close_devices
;
595 bdev
= fs_devices
->latest_bdev
;
596 s
= sget(fs_type
, btrfs_test_super
, set_anon_super
, fs_devices
);
601 if ((flags
^ s
->s_flags
) & MS_RDONLY
) {
602 deactivate_locked_super(s
);
604 goto error_close_devices
;
608 btrfs_close_devices(fs_devices
);
610 char b
[BDEVNAME_SIZE
];
613 strlcpy(s
->s_id
, bdevname(bdev
, b
), sizeof(s
->s_id
));
614 error
= btrfs_fill_super(s
, fs_devices
, data
,
615 flags
& MS_SILENT
? 1 : 0);
617 deactivate_locked_super(s
);
618 goto error_free_subvol_name
;
621 btrfs_sb(s
)->fs_info
->bdev_holder
= fs_type
;
622 s
->s_flags
|= MS_ACTIVE
;
625 root
= get_default_root(s
, subvol_objectid
);
627 error
= PTR_ERR(root
);
628 deactivate_locked_super(s
);
631 /* if they gave us a subvolume name bind mount into that */
632 if (strcmp(subvol_name
, ".")) {
633 struct dentry
*new_root
;
634 mutex_lock(&root
->d_inode
->i_mutex
);
635 new_root
= lookup_one_len(subvol_name
, root
,
636 strlen(subvol_name
));
637 mutex_unlock(&root
->d_inode
->i_mutex
);
639 if (IS_ERR(new_root
)) {
640 deactivate_locked_super(s
);
641 error
= PTR_ERR(new_root
);
643 goto error_close_devices
;
645 if (!new_root
->d_inode
) {
648 deactivate_locked_super(s
);
650 goto error_close_devices
;
657 mnt
->mnt_root
= root
;
665 btrfs_close_devices(fs_devices
);
666 error_free_subvol_name
:
672 static int btrfs_remount(struct super_block
*sb
, int *flags
, char *data
)
674 struct btrfs_root
*root
= btrfs_sb(sb
);
677 ret
= btrfs_parse_options(root
, data
);
681 if ((*flags
& MS_RDONLY
) == (sb
->s_flags
& MS_RDONLY
))
684 if (*flags
& MS_RDONLY
) {
685 sb
->s_flags
|= MS_RDONLY
;
687 ret
= btrfs_commit_super(root
);
690 if (root
->fs_info
->fs_devices
->rw_devices
== 0)
693 if (btrfs_super_log_root(&root
->fs_info
->super_copy
) != 0)
696 /* recover relocation */
697 ret
= btrfs_recover_relocation(root
);
700 ret
= btrfs_cleanup_fs_roots(root
->fs_info
);
703 sb
->s_flags
&= ~MS_RDONLY
;
709 static int btrfs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
711 struct btrfs_root
*root
= btrfs_sb(dentry
->d_sb
);
712 struct btrfs_super_block
*disk_super
= &root
->fs_info
->super_copy
;
713 struct list_head
*head
= &root
->fs_info
->space_info
;
714 struct btrfs_space_info
*found
;
717 int bits
= dentry
->d_sb
->s_blocksize_bits
;
718 __be32
*fsid
= (__be32
*)root
->fs_info
->fsid
;
721 list_for_each_entry_rcu(found
, head
, list
) {
722 if (found
->flags
& (BTRFS_BLOCK_GROUP_DUP
|
723 BTRFS_BLOCK_GROUP_RAID10
|
724 BTRFS_BLOCK_GROUP_RAID1
)) {
725 total_used
+= found
->bytes_used
;
726 if (found
->flags
& BTRFS_BLOCK_GROUP_DATA
)
727 data_used
+= found
->bytes_used
;
729 data_used
+= found
->total_bytes
;
732 total_used
+= found
->bytes_used
;
733 if (found
->flags
& BTRFS_BLOCK_GROUP_DATA
)
734 data_used
+= found
->bytes_used
;
736 data_used
+= found
->total_bytes
;
740 buf
->f_namelen
= BTRFS_NAME_LEN
;
741 buf
->f_blocks
= btrfs_super_total_bytes(disk_super
) >> bits
;
742 buf
->f_bfree
= buf
->f_blocks
- (total_used
>> bits
);
743 buf
->f_bavail
= buf
->f_blocks
- (data_used
>> bits
);
744 buf
->f_bsize
= dentry
->d_sb
->s_blocksize
;
745 buf
->f_type
= BTRFS_SUPER_MAGIC
;
747 /* We treat it as constant endianness (it doesn't matter _which_)
748 because we want the fsid to come out the same whether mounted
749 on a big-endian or little-endian host */
750 buf
->f_fsid
.val
[0] = be32_to_cpu(fsid
[0]) ^ be32_to_cpu(fsid
[2]);
751 buf
->f_fsid
.val
[1] = be32_to_cpu(fsid
[1]) ^ be32_to_cpu(fsid
[3]);
752 /* Mask in the root object ID too, to disambiguate subvols */
753 buf
->f_fsid
.val
[0] ^= BTRFS_I(dentry
->d_inode
)->root
->objectid
>> 32;
754 buf
->f_fsid
.val
[1] ^= BTRFS_I(dentry
->d_inode
)->root
->objectid
;
759 static struct file_system_type btrfs_fs_type
= {
760 .owner
= THIS_MODULE
,
762 .get_sb
= btrfs_get_sb
,
763 .kill_sb
= kill_anon_super
,
764 .fs_flags
= FS_REQUIRES_DEV
,
768 * used by btrfsctl to scan devices when no FS is mounted
770 static long btrfs_control_ioctl(struct file
*file
, unsigned int cmd
,
773 struct btrfs_ioctl_vol_args
*vol
;
774 struct btrfs_fs_devices
*fs_devices
;
777 if (!capable(CAP_SYS_ADMIN
))
780 vol
= memdup_user((void __user
*)arg
, sizeof(*vol
));
785 case BTRFS_IOC_SCAN_DEV
:
786 ret
= btrfs_scan_one_device(vol
->name
, FMODE_READ
,
787 &btrfs_fs_type
, &fs_devices
);
795 static int btrfs_freeze(struct super_block
*sb
)
797 struct btrfs_root
*root
= btrfs_sb(sb
);
798 mutex_lock(&root
->fs_info
->transaction_kthread_mutex
);
799 mutex_lock(&root
->fs_info
->cleaner_mutex
);
803 static int btrfs_unfreeze(struct super_block
*sb
)
805 struct btrfs_root
*root
= btrfs_sb(sb
);
806 mutex_unlock(&root
->fs_info
->cleaner_mutex
);
807 mutex_unlock(&root
->fs_info
->transaction_kthread_mutex
);
811 static const struct super_operations btrfs_super_ops
= {
812 .drop_inode
= btrfs_drop_inode
,
813 .delete_inode
= btrfs_delete_inode
,
814 .put_super
= btrfs_put_super
,
815 .sync_fs
= btrfs_sync_fs
,
816 .show_options
= btrfs_show_options
,
817 .write_inode
= btrfs_write_inode
,
818 .dirty_inode
= btrfs_dirty_inode
,
819 .alloc_inode
= btrfs_alloc_inode
,
820 .destroy_inode
= btrfs_destroy_inode
,
821 .statfs
= btrfs_statfs
,
822 .remount_fs
= btrfs_remount
,
823 .freeze_fs
= btrfs_freeze
,
824 .unfreeze_fs
= btrfs_unfreeze
,
827 static const struct file_operations btrfs_ctl_fops
= {
828 .unlocked_ioctl
= btrfs_control_ioctl
,
829 .compat_ioctl
= btrfs_control_ioctl
,
830 .owner
= THIS_MODULE
,
833 static struct miscdevice btrfs_misc
= {
834 .minor
= MISC_DYNAMIC_MINOR
,
835 .name
= "btrfs-control",
836 .fops
= &btrfs_ctl_fops
839 static int btrfs_interface_init(void)
841 return misc_register(&btrfs_misc
);
844 static void btrfs_interface_exit(void)
846 if (misc_deregister(&btrfs_misc
) < 0)
847 printk(KERN_INFO
"misc_deregister failed for control device");
850 static int __init
init_btrfs_fs(void)
854 err
= btrfs_init_sysfs();
858 err
= btrfs_init_cachep();
862 err
= extent_io_init();
866 err
= extent_map_init();
870 err
= btrfs_interface_init();
872 goto free_extent_map
;
874 err
= register_filesystem(&btrfs_fs_type
);
876 goto unregister_ioctl
;
878 printk(KERN_INFO
"%s loaded\n", BTRFS_BUILD_VERSION
);
882 btrfs_interface_exit();
888 btrfs_destroy_cachep();
894 static void __exit
exit_btrfs_fs(void)
896 btrfs_destroy_cachep();
899 btrfs_interface_exit();
900 unregister_filesystem(&btrfs_fs_type
);
902 btrfs_cleanup_fs_uuids();
906 module_init(init_btrfs_fs
)
907 module_exit(exit_btrfs_fs
)
909 MODULE_LICENSE("GPL");