On 2018/11/28 上午3:53, David Sterba wrote:
> We can use simple enum for values that are not part of on-disk format:
> root tree flags.
> 
> Signed-off-by: David Sterba <dsterba@suse.com>

Reviewed-by: Qu Wenruo <wqu@suse.com>

Thanks,
Qu

> ---
>  fs/btrfs/ctree.h | 33 +++++++++++++++++----------------
>  1 file changed, 17 insertions(+), 16 deletions(-)
> 
> diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
> index 7176b95b40e7..4bb0ac3050ff 100644
> --- a/fs/btrfs/ctree.h
> +++ b/fs/btrfs/ctree.h
> @@ -1180,22 +1180,23 @@ struct btrfs_subvolume_writers {
>  /*
>   * The state of btrfs root
>   */
> -/*
> - * btrfs_record_root_in_trans is a multi-step process,
> - * and it can race with the balancing code.   But the
> - * race is very small, and only the first time the root
> - * is added to each transaction.  So IN_TRANS_SETUP
> - * is used to tell us when more checks are required
> - */
> -#define BTRFS_ROOT_IN_TRANS_SETUP	0
> -#define BTRFS_ROOT_REF_COWS		1
> -#define BTRFS_ROOT_TRACK_DIRTY		2
> -#define BTRFS_ROOT_IN_RADIX		3
> -#define BTRFS_ROOT_ORPHAN_ITEM_INSERTED	4
> -#define BTRFS_ROOT_DEFRAG_RUNNING	5
> -#define BTRFS_ROOT_FORCE_COW		6
> -#define BTRFS_ROOT_MULTI_LOG_TASKS	7
> -#define BTRFS_ROOT_DIRTY		8
> +enum {
> +	/*
> +	 * btrfs_record_root_in_trans is a multi-step process, and it can race
> +	 * with the balancing code.   But the race is very small, and only the
> +	 * first time the root is added to each transaction.  So IN_TRANS_SETUP
> +	 * is used to tell us when more checks are required
> +	 */
> +	BTRFS_ROOT_IN_TRANS_SETUP,
> +	BTRFS_ROOT_REF_COWS,
> +	BTRFS_ROOT_TRACK_DIRTY,
> +	BTRFS_ROOT_IN_RADIX,
> +	BTRFS_ROOT_ORPHAN_ITEM_INSERTED,
> +	BTRFS_ROOT_DEFRAG_RUNNING,
> +	BTRFS_ROOT_FORCE_COW,
> +	BTRFS_ROOT_MULTI_LOG_TASKS,
> +	BTRFS_ROOT_DIRTY,
> +};
>  
>  /*
>   * in ram representation of the tree.  extent_root is used for all allocations
>