btrfs: add a helper to read the superblock metadata_uuid
[ Upstream commit 4844c366 ] In some cases, we need to read the FSID from the superblock when the metadata_uuid is not set, and otherwise, read the metadata_uuid. So, add a helper. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Tested-by: Guilherme G. Piccoli <gpiccoli@igalia.com> Signed-off-by: Anand Jain <anand.jain@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Stable-dep-of: 6bfe3959 ("btrfs: compare the correct fsid/metadata_uuid in btrfs_validate_super") Signed-off-by: Sasha Levin <sashal@kernel.org>
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