btrfs: move btrfs_scratch_superblocks into btrfs_dev_replace_finishing
We need to move the closing of the src_device out of all the device replace locking, but we definitely want to zero out the superblock before we commit the last time to make sure the device is properly removed. Handle this by pushing btrfs_scratch_superblocks into btrfs_dev_replace_finishing, and then later on we'll move the src_device closing and freeing stuff where we need it to be. Reviewed-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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