From: Andi Kleen <ak@linux.intel.com>
Date: Tue, 2 Aug 2011 04:38:07 +0000 (-0700)
Subject: direct-io: separate map_bh from dio
X-Git-Tag: v3.2-rc1~131^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=18772641dbe2c89c6122c603f81f6a9574aee556;p=pandora-kernel.git

direct-io: separate map_bh from dio

Only a single b_private field in the map_bh buffer head is needed after
the submission path. Move map_bh separately to avoid storing
this information in the long term slab.

This avoids the weird 104 byte hole in struct dio_submit which also needed
to be memseted early.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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