In order to avoid moving all of the related code at once temporarily
export all of the extent state related helpers.  Then move these helpers
into extent-io-tree.c.  We will clean up the exports and make them
static in followup patches.
Signed-off-by: NJosef Bacik <josef@toxicpanda.com>
Reviewed-by: NDavid Sterba <dsterba@suse.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>