From: Jens Axboe <axboe@fb.com>
Date: Thu, 5 Jun 2014 19:38:39 +0000 (-0600)
Subject: block: add notion of a chunk size for request merging
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~56^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=762380ad9322951cea4ce9d24864265f9c66a916;p=pandora-kernel.git

block: add notion of a chunk size for request merging

Some drivers have different limits on what size a request should
optimally be, depending on the offset of the request. Similar to
dividing a device into chunks. Add a setting that allows the driver
to inform the block layer of such a chunk size. The block layer will
then prevent merging across the chunks.

This is needed to optimally support NVMe with a non-zero stripe size.

Signed-off-by: Jens Axboe <axboe@fb.com>
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