From: Josef Bacik <jbacik@fusionio.com>
Date: Sun, 30 Jun 2013 03:15:19 +0000 (-0400)
Subject: Btrfs: hold the tree mod lock in __tree_mod_log_rewind
X-Git-Tag: v3.11-rc1~70^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f1ca7e98a67da618d8595866e0860308525154da;p=pandora-kernel.git

Btrfs: hold the tree mod lock in __tree_mod_log_rewind

We need to hold the tree mod log lock in __tree_mod_log_rewind since we walk
forward in the tree mod entries, otherwise we'll end up with random entries and
trip the BUG_ON() at the front of __tree_mod_log_rewind.  This fixes the panics
people were seeing when running

find /whatever -type f -exec btrfs fi defrag {} \;

Thansk,

Cc: stable@vger.kernel.org
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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