Symbol: BP_IS_HOLE
stand/libsa/zfs/zfsimpl.c
2329
if (BP_IS_HOLE(gbp))
stand/libsa/zfs/zfsimpl.c
2506
if (BP_IS_HOLE(&bp)) {
sys/cddl/boot/zfs/zfsimpl.h
457
#define BP_IS_OLDER(bp, txg) (!BP_IS_HOLE(bp) && (bp)->blk_birth < (txg))