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:
> extent map flags.
>
> Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Reviewed-by: Qu Wenruo <wqu@xxxxxxxx>
Thanks,
Qu
> ---
> fs/btrfs/extent_map.h | 21 ++++++++++++++-------
> 1 file changed, 14 insertions(+), 7 deletions(-)
>
> diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
> index 31977ffd6190..ef05a0121652 100644
> --- a/fs/btrfs/extent_map.h
> +++ b/fs/btrfs/extent_map.h
> @@ -11,13 +11,20 @@
> #define EXTENT_MAP_INLINE ((u64)-2)
> #define EXTENT_MAP_DELALLOC ((u64)-1)
>
> -/* bits for the flags field */
> -#define EXTENT_FLAG_PINNED 0 /* this entry not yet on disk, don't free it */
> -#define EXTENT_FLAG_COMPRESSED 1
> -#define EXTENT_FLAG_PREALLOC 3 /* pre-allocated extent */
> -#define EXTENT_FLAG_LOGGING 4 /* Logging this extent */
> -#define EXTENT_FLAG_FILLING 5 /* Filling in a preallocated extent */
> -#define EXTENT_FLAG_FS_MAPPING 6 /* filesystem extent mapping type */
> +/* bits for the extent_map::flags field */
> +enum {
> + /* this entry not yet on disk, don't free it */
> + EXTENT_FLAG_PINNED,
> + EXTENT_FLAG_COMPRESSED,
> + /* pre-allocated extent */
> + EXTENT_FLAG_PREALLOC,
> + /* Logging this extent */
> + EXTENT_FLAG_LOGGING,
> + /* Filling in a preallocated extent */
> + EXTENT_FLAG_FILLING,
> + /* filesystem extent mapping type */
> + EXTENT_FLAG_FS_MAPPING,
> +};
>
> struct extent_map {
> struct rb_node rb_node;
>
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