From: Josef Bacik <jbacik@fb.com>
Date: Fri, 28 Mar 2014 21:16:01 +0000 (-0400)
Subject: Btrfs: hold the commit_root_sem when getting the commit root during send
X-Git-Tag: v3.15-rc1~23^2~18
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3f8a18cc53bd1be26eb5b5247e1386ad0e21b623;p=pandora-kernel.git

Btrfs: hold the commit_root_sem when getting the commit root during send

We currently rely too heavily on roots being read-only to save us from just
accessing root->commit_root.  We can easily balance blocks out from underneath a
read only root, so to save us from getting screwed make sure we only access
root->commit_root under the commit root sem.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
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