From: Jan Schmidt <list.btrfs@jan-o-sch.net>
Date: Mon, 4 Jun 2012 14:54:57 +0000 (+0200)
Subject: Btrfs: use btrfs_read_lock_root_node in get_old_root
X-Git-Tag: v3.5-rc3~18^2~6^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8ba97a15e7d4f70b9af71fa1db86a28dd17ad1b2;p=pandora-kernel.git

Btrfs: use btrfs_read_lock_root_node in get_old_root

get_old_root could race with root node updates because we weren't locking
the node early enough. Use btrfs_read_lock_root_node to grab the root locked
in the very beginning and release the lock as soon as possible (just like
btrfs_search_slot does).

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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