+zap_prefetch_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
+ int key_numints)
+{
+ zap_t *zap;
+ int err;
+ zap_name_t *zn;
+
+ err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap);
+ if (err)
+ return (err);
+ zn = zap_name_alloc_uint64(zap, key, key_numints);
+ if (zn == NULL) {
+ zap_unlockdir(zap);
+ return (ENOTSUP);
+ }
+
+ fzap_prefetch(zn);
+ zap_name_free(zn);
+ zap_unlockdir(zap);
+ return (err);
+}
+
+int
+zap_lookup_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
+ int key_numints, uint64_t integer_size, uint64_t num_integers, void *buf)
+{
+ zap_t *zap;
+ int err;
+ zap_name_t *zn;
+
+ err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, &zap);
+ if (err)
+ return (err);
+ zn = zap_name_alloc_uint64(zap, key, key_numints);
+ if (zn == NULL) {
+ zap_unlockdir(zap);
+ return (ENOTSUP);
+ }
+
+ err = fzap_lookup(zn, integer_size, num_integers, buf,
+ NULL, 0, NULL);
+ zap_name_free(zn);
+ zap_unlockdir(zap);
+ return (err);
+}
+
+int
+zap_contains(objset_t *os, uint64_t zapobj, const char *name)
+{
+ int err = (zap_lookup_norm(os, zapobj, name, 0,
+ 0, NULL, MT_EXACT, NULL, 0, NULL));
+ if (err == EOVERFLOW || err == EINVAL)
+ err = 0; /* found, but skipped reading the value */
+ return (err);
+}
+
+int