This is used by the subpage code in addition to lock_extent_bits, so
export it so we can move it out of extent_io.c
Signed-off-by: NJosef Bacik <josef@toxicpanda.com>
Reviewed-by: NDavid Sterba <dsterba@suse.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>