From: Anand Jain <Anand.Jain@oracle.com>
Date: Wed, 13 Aug 2014 06:24:21 +0000 (+0800)
Subject: btrfs: fix rw_devices miss match after seed replace
X-Git-Tag: fixes-against-v3.18-rc2~120^2~73
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=63dd86fa79db737a50f47488e5249f24e5acebc1;p=pandora-kernel.git

btrfs: fix rw_devices miss match after seed replace

reproducer:
    reproducer:
    mount /dev/sdb /btrfs
    btrfs dev add /dev/sdc /btrfs
    btrfs rep start -B /dev/sdb /dev/sdd /btrfs
    umount /btrfs

WARNING: CPU: 0 PID: 3882 at fs/btrfs/volumes.c:892 __btrfs_close_devices+0x1c8/0x200 [btrfs]()

which is

        WARN_ON(fs_devices->rw_devices);

   The problem here is that we did not add one to the rw_devices when
   we replace the seed device with a writable device.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Chris Mason <clm@fb.com>
---

Reading git-diff-tree failed