From: Mike Snitzer <snitzer@redhat.com>
Date: Sat, 19 Jul 2014 17:25:46 +0000 (-0400)
Subject: dm cache: set minimum_io_size to cache's data block size
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~72^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b02465308f13f3266480275fd143747bfd441a2f;p=pandora-kernel.git

dm cache: set minimum_io_size to cache's data block size

Before, if the block layer's limit stacking didn't establish an
optimal_io_size that was compatible with the cache's data block size
we'd set optimal_io_size to the data block size and minimum_io_size to 0
(which the block layer adjusts to be physical_block_size).

Update cache_io_hints() to set both minimum_io_size and optimal_io_size
to the cache's data block size.  This fixes an issue where mkfs.xfs
would create more XFS Allocation Groups on cache volumes than on a
normal linear LV of comparable size.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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