From: Joe Thornber <ejt@redhat.com>
Date: Fri, 10 May 2013 13:37:20 +0000 (+0100)
Subject: dm persistent data: add threshold callback to space map
X-Git-Tag: v3.10-rc1~12^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7c3d3f2a87b01ff167a5f048285d5e3dee920235;p=pandora-kernel.git

dm persistent data: add threshold callback to space map

Add a threshold callback function to the persistent data space map
interface for a subsequent patch to use.

dm-thin and dm-cache are interested in knowing when they're getting
low on metadata or data blocks.  This patch introduces a new method
for registering a callback against a threshold.

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