+static int
+snapshot_to_nvl_cb(zfs_handle_t *zhp, void *arg)
+{
+ destroy_cbdata_t *cb = arg;
+ int err = 0;
+
+ /* Check for clones. */
+ if (!cb->cb_doclones && !cb->cb_defer_destroy) {
+ cb->cb_target = zhp;
+ cb->cb_first = B_TRUE;
+ err = zfs_iter_dependents(zhp, B_TRUE,
+ destroy_check_dependent, cb);
+ }
+
+ if (err == 0) {
+ if (nvlist_add_boolean(cb->cb_nvl, zfs_get_name(zhp)))
+ nomem();
+ }
+ zfs_close(zhp);
+ return (err);
+}
+
+static int
+gather_snapshots(zfs_handle_t *zhp, void *arg)
+{
+ destroy_cbdata_t *cb = arg;
+ int err = 0;
+
+ err = zfs_iter_snapspec(zhp, cb->cb_snapspec, snapshot_to_nvl_cb, cb);
+ if (err == ENOENT)
+ err = 0;
+ if (err != 0)
+ goto out;
+
+ if (cb->cb_verbose) {
+ err = destroy_print_snapshots(zhp, cb);
+ if (err != 0)
+ goto out;
+ }
+
+ if (cb->cb_recurse)
+ err = zfs_iter_filesystems(zhp, gather_snapshots, cb);
+
+out:
+ zfs_close(zhp);
+ return (err);
+}
+
+static int
+destroy_clones(destroy_cbdata_t *cb)
+{
+ nvpair_t *pair;
+ for (pair = nvlist_next_nvpair(cb->cb_nvl, NULL);
+ pair != NULL;
+ pair = nvlist_next_nvpair(cb->cb_nvl, pair)) {
+ zfs_handle_t *zhp = zfs_open(g_zfs, nvpair_name(pair),
+ ZFS_TYPE_SNAPSHOT);
+ if (zhp != NULL) {
+ boolean_t defer = cb->cb_defer_destroy;
+ int err;
+
+ /*
+ * We can't defer destroy non-snapshots, so set it to
+ * false while destroying the clones.
+ */
+ cb->cb_defer_destroy = B_FALSE;
+ err = zfs_iter_dependents(zhp, B_FALSE,
+ destroy_callback, cb);
+ cb->cb_defer_destroy = defer;
+ zfs_close(zhp);
+ if (err != 0)
+ return (err);
+ }
+ }
+ return (0);