zoned_to_mp
zoned_to_mp(kobj)->m_max_open_zones - XFS_OPEN_GC_ZONES);
struct xfs_zone_info *zi = zoned_to_mp(kobj)->m_zone_info;
struct xfs_mount *mp = zoned_to_mp(kobj);
zoned_to_mp(kobj)->m_zonegc_low_space);