From: Miao Xie <miaox@cn.fujitsu.com>
Date: Thu, 6 Jun 2013 03:28:03 +0000 (+0000)
Subject: Btrfs: fix broken nocow after balance
X-Git-Tag: v3.11-rc1~70^2~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5bc7247ac47cf100309e4d7e24214889c46a1636;p=pandora-kernel.git

Btrfs: fix broken nocow after balance

Balance will create reloc_root for each fs root, and it's going to
record last_snapshot to filter shared blocks.  The side effect of
setting last_snapshot is to break nocow attributes of files.

Since the extents are not shared by the relocation tree after the balance,
we can recover the old last_snapshot safely if no one snapshoted the
source tree. We fix the above problem by this way.

Reported-by: Kyle Gates <kylegates@hotmail.com>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
---

Reading git-diff-tree failed