Btrfs: fix unblocked autodefraggers when remount

The new mount option is set after parsing the remount arguments,
so it is wrong that checking the autodefrag is close or not at
btrfs_remount_prepare(). Fix it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 88f812e..5dc54ae 100644 (file)
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1191,11 +1191,14 @@ 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)
+static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info)
 {
        set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
+}
 
+static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info,
+                                      unsigned long old_opts, int flags)
+{
        if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) &&
            (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) ||
             (flags & MS_RDONLY))) {
@@ -1236,7 +1239,7 @@ 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);
+       btrfs_remount_prepare(fs_info);
 
        ret = btrfs_parse_options(root, data);
        if (ret) {
@@ -1244,6 +1247,7 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
                goto restore;
        }
 
+       btrfs_remount_begin(fs_info, old_opts, *flags);
        btrfs_resize_thread_pool(fs_info,
                fs_info->thread_pool_size, old_thread_pool_size);