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:
> ordered extent flags.
> 
> Signed-off-by: David Sterba <dsterba@suse.com>

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

Thanks,
Qu

> ---
>  fs/btrfs/ordered-data.h | 45 +++++++++++++++++++++++------------------
>  1 file changed, 25 insertions(+), 20 deletions(-)
> 
> diff --git a/fs/btrfs/ordered-data.h b/fs/btrfs/ordered-data.h
> index b10e6765d88f..fb9a161f0215 100644
> --- a/fs/btrfs/ordered-data.h
> +++ b/fs/btrfs/ordered-data.h
> @@ -37,26 +37,31 @@ struct btrfs_ordered_sum {
>   * rbtree, just before waking any waiters.  It is used to indicate the
>   * IO is done and any metadata is inserted into the tree.
>   */
> -#define BTRFS_ORDERED_IO_DONE 0 /* set when all the pages are written */
> -
> -#define BTRFS_ORDERED_COMPLETE 1 /* set when removed from the tree */
> -
> -#define BTRFS_ORDERED_NOCOW 2 /* set when we want to write in place */
> -
> -#define BTRFS_ORDERED_COMPRESSED 3 /* writing a zlib compressed extent */
> -
> -#define BTRFS_ORDERED_PREALLOC 4 /* set when writing to preallocated extent */
> -
> -#define BTRFS_ORDERED_DIRECT 5 /* set when we're doing DIO with this extent */
> -
> -#define BTRFS_ORDERED_IOERR 6 /* We had an io error when writing this out */
> -
> -#define BTRFS_ORDERED_UPDATED_ISIZE 7 /* indicates whether this ordered extent
> -				       * has done its due diligence in updating
> -				       * the isize. */
> -#define BTRFS_ORDERED_TRUNCATED 8 /* Set when we have to truncate an extent */
> -
> -#define BTRFS_ORDERED_REGULAR 10 /* Regular IO for COW */
> +enum {
> +	/* set when all the pages are written */
> +	BTRFS_ORDERED_IO_DONE,
> +	/* set when removed from the tree */
> +	BTRFS_ORDERED_COMPLETE,
> +	/* set when we want to write in place */
> +	BTRFS_ORDERED_NOCOW,
> +	/* writing a zlib compressed extent */
> +	BTRFS_ORDERED_COMPRESSED,
> +	/* set when writing to preallocated extent */
> +	BTRFS_ORDERED_PREALLOC,
> +	/* set when we're doing DIO with this extent */
> +	BTRFS_ORDERED_DIRECT,
> +	/* We had an io error when writing this out */
> +	BTRFS_ORDERED_IOERR,
> +	/*
> +	 * indicates whether this ordered extent has done its due diligence in
> +	 * updating the isize
> +	 */
> +	BTRFS_ORDERED_UPDATED_ISIZE,
> +	/* Set when we have to truncate an extent */
> +	BTRFS_ORDERED_TRUNCATED,
> +	/* Regular IO for COW */
> +	BTRFS_ORDERED_REGULAR,
> +};
>  
>  struct btrfs_ordered_extent {
>  	/* logical offset in the file */
>