Re: [PATCH 01/18] libceph: add scatterlist messenger data type

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On Wed, Jul 29, 2015 at 04:23:38AM -0500, mchristi@xxxxxxxxxx wrote:
> From: Mike Christie <michaelc@xxxxxxxxxxx>
> 
> LIO uses scatterlist for its page/data management. This patch
> adds a scatterlist messenger data type, so LIO can pass its sg
> down directly to rbd.

Just as I mentioned for David's patches this is the wrong way to attack
your problem.  The block layer already supports WRITE SAME, and COMPARE
and WRITE nees to be supported at that level too insted of creating
artifical bypasses.
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