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This patch adds a separated set_uuid[16] in struct cache_set, to store the uuid of the cache set. This is the preparation to remove the embedded struct cache_sb from struct cache_set. Signed-off-by: Coly Li <colyli@suse.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>