zil_lwb_add_block
zil_lwb_add_block(zgd->zgd_lwb, zgd->zgd_bp);
zil_lwb_add_block(zgd->zgd_lwb, zgd->zgd_bp);
extern void zil_lwb_add_block(struct lwb *lwb, const blkptr_t *bp);
zil_lwb_add_block(lwb, &lwb->lwb_blk);