BTRFS_FS_STATE_DUMMY_FS_INFO
return unlikely(test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state));
[BTRFS_FS_STATE_DUMMY_FS_INFO] = 0,
set_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);