From: Joe Thornber <ejt@redhat.com>
Date: Wed, 28 Mar 2012 17:41:29 +0000 (+0100)
Subject: dm thin: add pool target flags to control discard
X-Git-Tag: v3.4-rc1~68^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=67e2e2b281812b5caf4923a38aadc6b89e34f064;p=pandora-kernel.git

dm thin: add pool target flags to control discard

Add dm thin target arguments to control discard support.

ignore_discard: Disables discard support

no_discard_passdown: Don't pass discards down to the underlying data
device, but just remove the mapping within the thin provisioning target.

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