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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: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>