From: Heinz Mauelshagen <heinzm@redhat.com>
Date: Wed, 24 Sep 2014 15:47:18 +0000 (+0200)
Subject: dm raid: add discard support for RAID levels 1 and 10
X-Git-Tag: fixes-against-v3.18-rc2~51^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=75b8e04bbf01bdd5c42a1d8ac54abf757196ce49;p=pandora-kernel.git

dm raid: add discard support for RAID levels 1 and 10

Discard support is not enabled for RAID levels 4, 5, and 6 at this time
due to concerns about unreliable discard_zeroes_data support on some
hardware.  Otherwise, discards could cause stripe data corruption
(classic example of bad apples spoiling the bunch).

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