From: Mikulas Patocka <mpatocka@redhat.com>
Date: Fri, 16 Oct 2009 22:18:16 +0000 (+0100)
Subject: dm snapshot: lock snapshot while supplying status
X-Git-Tag: v2.6.32-rc6~118^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4c6fff445d7aa753957856278d4d93bcad6e2c14;p=pandora-kernel.git

dm snapshot: lock snapshot while supplying status

This patch locks the snapshot when returning status.  It fixes a race
when it could return an invalid number of free chunks if someone
was simultaneously modifying it.

Cc: stable@kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
---

Reading git-diff-tree failed