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

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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>

...

This commit is contained in:

Miao Xie 2014-07-24 11:37:06 +08:00 • committed by Chris Mason

parent 2c91943b50

commit ff61d17c63

1 changed files with 6 additions and 2 deletions

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fs/btrfs/volumes.c

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