From: Mike Snitzer <snitzer@redhat.com>
Date: Thu, 12 Aug 2010 03:14:24 +0000 (+0100)
Subject: dm: split discard requests on target boundaries
X-Git-Tag: v2.6.36-rc1~51^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a79245b3e5669dc203fec63644d988c451fe55d5;p=pandora-kernel.git

dm: split discard requests on target boundaries

Update __clone_and_map_discard to loop across all targets in a DM
device's table when it processes a discard bio.  If a discard crosses a
target boundary it must be split accordingly.

Update __issue_target_requests and __issue_target_request to allow a
cloned discard bio to have a custom start sector and size.

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