From: Mikulas Patocka <mpatocka@redhat.com>
Date: Fri, 27 Jul 2012 14:08:03 +0000 (+0100)
Subject: dm thin: split discards on block boundary
X-Git-Tag: v3.6-rc1~56^2~45
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4929630901100fdbfa19186ecf5ea2706f57719b;p=pandora-kernel.git

dm thin: split discards on block boundary

This patch sets the variable "ti->split_discard_requests" for the dm thin
target so that device mapper core splits discard requests on a block
boundary.

Consequently, a discard request that spans multiple blocks is never sent
to dm-thin. The patch also removes some code in process_discard that
deals with discards that span multiple blocks.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
---

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