From: Alex Elder <elder@inktank.com>
Date: Thu, 23 May 2013 01:54:25 +0000 (-0500)
Subject: rbd: flush dcache after zeroing page data
X-Git-Tag: v3.11-rc1~69^2~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e215605417b87732c6debf65da6d953016a1e5bc;p=pandora-kernel.git

rbd: flush dcache after zeroing page data

Neither zero_bio_chain() nor zero_pages() contains a call to flush
caches after zeroing a portion of a page.  This can cause problems
on architectures that have caches that allow virtual address
aliasing.

This resolves:
    http://tracker.ceph.com/issues/4777

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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