From: Miao Xie <miaox@cn.fujitsu.com>
Date: Thu, 24 Jul 2014 03:37:06 +0000 (+0800)
Subject: Btrfs: Fix the problem that the replace destroys the seed filesystem
X-Git-Tag: omap-fixes-against-v3.17-rc3~41^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ff61d17c6324d1b483fbbc5144f09668c24ff60c;p=pandora-kernel.git

Btrfs: Fix the problem that the replace destroys the seed filesystem

The seed filesystem was destroyed by the device replace, the reproduce
method is:
 # mkfs.btrfs -f <dev0>
 # btrfstune -S 1 <dev0>
 # mount <dev0> <mnt>
 # btrfs device add <dev1> <mnt>
 # umount <mnt>
 # mount <dev1> <mnt>
 # btrfs replace start -f <dev0> <dev2> <mnt>
 # umount <mnt>
 # mount <dev0> <mnt>

It is because we erase the super block on the seed device. It is wrong,
we should not change anything on the seed device.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
---

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