Re: [PATCH v2] btrfs-progs: force overwrite should wipe stale SB

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 Thanks.
Anand

On 10/10/2014 03:39 PM, David Sterba wrote:
On Thu, Oct 02, 2014 at 07:22:09AM +0800, Anand Jain wrote:
(I am unable to reproduce the issue, tried to go back with progs versions
but still the same. So as of now this code remains untested, suggest to
wait till we have a reproducible test case).

Here is a test case which says it all..

mkfs.xfs -f $DEV
mkfs.btrfs -f $DEV
mount $DEV $MNT
mount: /dev/vdiskc: more filesystems detected. This should not happen,
        use -t <type> to explicitly specify the filesystem type or
        use wipefs(8) to clean up the device.

mount: you must specify the filesystem type

with this patch btrfs_prepare_device() also wipes old FS if any,
btrfs_prepare_device() is called after we have verified that
user has provided -f option.

v2: to satisfy the backward compatibility issue, replace
blkid_do_wipe() with local wipe function.

Thank you, works for me, added to 3.17 queue.
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