dm zoned: add a 'reserved' zone flag
Instead of counting the number of reserved zones in dmz_free_zone(), mark the zone as 'reserved' during allocation and simplify dmz_free_zone(). Signed-off-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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