diff --git a/sbin/geom/misc/subr.c b/sbin/geom/misc/subr.c
index 745d91955d3d..64df7c6845ed 100644
--- a/sbin/geom/misc/subr.c
+++ b/sbin/geom/misc/subr.c
@@ -414,3 +414,47 @@ gctl_change_param(struct gctl_req *req, const char *name, int len,
 	}
 	return (ENOENT);
 }
+
+int
+gctl_delete_param(struct gctl_req *req, const char *name)
+{
+	struct gctl_req_arg *ap;
+	unsigned int i;
+
+	if (req == NULL || req->error != NULL)
+		return (EDOOFUS);
+
+	i = 0;
+	while (i < req->narg) {
+		ap = &req->arg[i];
+		if (strcmp(ap->name, name) == 0)
+			break;
+		i++;
+	}
+	if (i == req->narg)
+		return (ENOENT);
+
+	req->narg--;
+	while (i < req->narg) {
+		req->arg[i] = req->arg[i + 1];
+		i++;
+	}
+	return (0);
+}
+
+int
+gctl_has_param(struct gctl_req *req, const char *name)
+{
+	struct gctl_req_arg *ap;
+	unsigned int i;
+
+	if (req == NULL || req->error != NULL)
+		return (0);
+
+	for (i = 0; i < req->narg; i++) {
+		ap = &req->arg[i];
+		if (strcmp(ap->name, name) == 0)
+			return (1);
+	}
+	return (0);
+}
diff --git a/sbin/geom/misc/subr.h b/sbin/geom/misc/subr.h
index 4c54142891bc..c3242a3bdc9b 100644
--- a/sbin/geom/misc/subr.h
+++ b/sbin/geom/misc/subr.h
@@ -47,4 +47,7 @@ intmax_t gctl_get_intmax(struct gctl_req *req, const char *pfmt, ...) __printfli
 const char *gctl_get_ascii(struct gctl_req *req, const char *pfmt, ...) __printflike(2, 3);
 int gctl_change_param(struct gctl_req *req, const char *name, int len,
     const void *value);
+int gctl_delete_param(struct gctl_req *req, const char *name);
+int gctl_has_param(struct gctl_req *req, const char *name);
+
 #endif	/* !_SUBR_H_ */