From: Shaohua Li <shli@kernel.org>
Date: Fri, 14 Dec 2012 03:15:36 +0000 (+0800)
Subject: block: discard granularity might not be power of 2
X-Git-Tag: v3.8-rc1~81^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8dd2cb7e880d2f77fba53b523c99133ad5054cfd;p=pandora-kernel.git

block: discard granularity might not be power of 2

In MD raid case, discard granularity might not be power of 2, for example, a
4-disk raid5 has 3*chunk_size discard granularity. Correct the calculation for
such cases.

Reported-by: Neil Brown <neilb@suse.de>
Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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