Re: [PATCH 1/5] block: Implement support for WRITE SAME

[Mike Snitzer <snitzer@redhat.com>]

On Mon, Jan 30 2012 at  7:31pm -0500,
Martin K. Petersen <martin.petersen@oracle.com> wrote:

> diff --git a/Documentation/ABI/testing/sysfs-block b/Documentation/ABI/testing/sysfs-block
> index c1eb41c..e5f4194 100644
> --- a/Documentation/ABI/testing/sysfs-block
> +++ b/Documentation/ABI/testing/sysfs-block
> @@ -206,3 +206,16 @@ Description:
>  		when a discarded area is read the discard_zeroes_data
>  		parameter will be set to one. Otherwise it will be 0 and
>  		the result of reading a discarded area is undefined.
> +
> +What:		/sys/block/<disk>/queue/max_write_same_bytes
> +Date:		January 2012
> +Contact:	Martin K. Petersen <martin.petersen@oracle.com>
> +Description:
> +		Some devices support a write same operation in which a
> +		single data block can be written to a range of several
> +		contiguous blocks on storage. This can be used to wipe
> +		areas on disk or to initialize drives in a RAID
> +		configuration. max_write_same_bytes indicates how many
> +		bytes can be written in a single write same command. If
> +		max_write_same_bytes is 0, write same is not supported
> +		by the device.

How about write_same_max_bytes to follow the pattern established with
/sys/block/<disk>/queue/discard_max_bytes?