From: Eric Sandeen <sandeen@redhat.com>
Date: Tue, 27 Jul 2010 15:56:06 +0000 (-0400)
Subject: ext4: allocate stripe-multiple IOs on stripe boundaries
X-Git-Tag: v2.6.36-rc1~501^2~18
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=506bf2d82165c09b179a5077e01037f6270a4db3;p=pandora-kernel.git

ext4: allocate stripe-multiple IOs on stripe boundaries

For some reason, today mballoc only allocates IOs which are exactly
stripe-sized on a stripe boundary.  If you have a multiple (say, a
128k IO on a 64k stripe) you may end up unaligned.

It seems to me that a simple change to align stripe-multiple IOs
on stripe boundaries would be a very good idea, unless this breaks
some other mballoc heuristic for some reason...

Reported-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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