CTR_FLAG_SYNC
#define CTR_FLAGS_ANY_SYNC (CTR_FLAG_SYNC | CTR_FLAG_NOSYNC)
if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_SYNC))) {
#define RAID6_VALID_FLAGS (CTR_FLAG_SYNC | \
{ CTR_FLAG_SYNC, "sync"},
DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_SYNC));