Function zap_create_leaf

freebsd/contrib/openzfs/module/zfs/zap.c:424–448

}

static zap_leaf_t *
zap_create_leaf(zap_t *zap, dmu_tx_t *tx)
{
	zap_leaf_t *l = kmem_zalloc(sizeof (zap_leaf_t), KM_SLEEP);

	ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));

	rw_init(&l->l_rwlock, NULL, RW_NOLOCKDEP, NULL);
	rw_enter(&l->l_rwlock, RW_WRITER);
	l->l_blkid = zap_allocate_blocks(zap, 1);
	l->l_dbuf = NULL;

	VERIFY0(dmu_buf_hold(zap->zap_objset, zap->zap_object,
	    l->l_blkid << FZAP_BLOCK_SHIFT(zap), NULL, &l->l_dbuf,
	    DMU_READ_NO_PREFETCH));
	dmu_buf_init_user(&l->l_dbu, zap_leaf_evict_sync, NULL, &l->l_dbuf);
	VERIFY3P(NULL, ==, dmu_buf_set_user(l->l_dbuf, &l->l_dbu));
	dmu_buf_will_dirty(l->l_dbuf, tx);

	zap_leaf_init(l, zap->zap_normflags != 0);

	zap_f_phys(zap)->zap_num_leafs++;

	return (l);
}

int
fzap_count(zap_t *zap, uint64_t *count)