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Btrfs: fix remount vs autodefrag 

If we remount the fs to close the auto defragment or make the fs R/O,
we should stop the auto defragment.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Miao Xie 2013-02-20 23:32:52 -07:00 committed by Chris Mason
parent 172a50497f
commit dc81cdc58a
3 changed files with 45 additions and 2 deletions
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2
fs/btrfs/ctree.h
View File

@ -339,6 +339,7 @@ static inline unsigned long btrfs_chunk_item_size(int num_stripes)
* File system states
*/
#define BTRFS_FS_STATE_ERROR 0
#define BTRFS_FS_STATE_REMOUNTING 1
/* Super block flags */
/* Errors detected */
@ -1902,6 +1903,7 @@ struct btrfs_ioctl_defrag_range_args {
#define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
#define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
#define btrfs_raw_test_opt(o, opt) ((o) & BTRFS_MOUNT_##opt)
#define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
BTRFS_MOUNT_##opt)
/*

5
fs/btrfs/file.c
View File

@ -374,6 +374,11 @@ int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info)
atomic_inc(&fs_info->defrag_running);
while(1) {
/* Pause the auto defragger. */
if (test_bit(BTRFS_FS_STATE_REMOUNTING,
&fs_info->fs_state))
break;
if (!__need_auto_defrag(fs_info->tree_root))
break;

40
fs/btrfs/super.c
View File

@ -1202,6 +1202,38 @@ static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info,
new_pool_size);
}
static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info,
unsigned long old_opts, int flags)
{
set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) &&
(!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) ||
(flags & MS_RDONLY))) {
/* wait for any defraggers to finish */
wait_event(fs_info->transaction_wait,
(atomic_read(&fs_info->defrag_running) == 0));
if (flags & MS_RDONLY)
sync_filesystem(fs_info->sb);
}
}
static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info,
unsigned long old_opts)
{
/*
* We need cleanup all defragable inodes if the autodefragment is
* close or the fs is R/O.
*/
if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) &&
(!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) ||
(fs_info->sb->s_flags & MS_RDONLY))) {
btrfs_cleanup_defrag_inodes(fs_info);
}
clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
}
static int btrfs_remount(struct super_block *sb, int *flags, char *data)
{
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
@ -1215,6 +1247,8 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
unsigned int old_metadata_ratio = fs_info->metadata_ratio;
int ret;
btrfs_remount_prepare(fs_info, old_opts, *flags);
ret = btrfs_parse_options(root, data);
if (ret) {
ret = -EINVAL;
@ -1225,7 +1259,7 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
fs_info->thread_pool_size, old_thread_pool_size);
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
return 0;
goto out;
if (*flags & MS_RDONLY) {
/*
@ -1280,7 +1314,8 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
}
sb->s_flags &= ~MS_RDONLY;
}
out:
btrfs_remount_cleanup(fs_info, old_opts);
return 0;
restore:
@ -1297,6 +1332,7 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
btrfs_resize_thread_pool(fs_info,
old_thread_pool_size, fs_info->thread_pool_size);
fs_info->metadata_ratio = old_metadata_ratio;
btrfs_remount_cleanup(fs_info, old_opts);
return ret;
}