Index: head/sys/geom/part/g_part.c
===================================================================
--- head/sys/geom/part/g_part.c
+++ head/sys/geom/part/g_part.c
@@ -469,7 +469,6 @@
 {
 	struct g_consumer *cp;
 	struct g_provider *pp;
-	struct sbuf *sb;
 	struct g_geom_alias *gap;
 	off_t offset;
 
@@ -481,11 +480,7 @@
 		entry->gpe_offset = offset;
 
 	if (entry->gpe_pp == NULL) {
-		sb = sbuf_new_auto();
-		G_PART_FULLNAME(table, entry, sb, gp->name);
-		sbuf_finish(sb);
-		entry->gpe_pp = g_new_providerf(gp, "%s", sbuf_data(sb));
-		sbuf_delete(sb);
+		entry->gpe_pp = G_PART_NEW_PROVIDER(table, gp, entry, gp->name);
 		/*
 		 * If our parent provider had any aliases, then copy them to our
 		 * provider so when geom DEV tastes things later, they will be
@@ -493,13 +488,8 @@
 		 * place of the geom's name we use to create the provider. The
 		 * kobj interface that generates names makes this awkward.
 		 */
-		LIST_FOREACH(gap, &pp->aliases, ga_next) {
-			sb = sbuf_new_auto();
-			G_PART_FULLNAME(table, entry, sb, gap->ga_alias);
-			sbuf_finish(sb);
-			g_provider_add_alias(entry->gpe_pp, "%s", sbuf_data(sb));
-			sbuf_delete(sb);
-		}
+		LIST_FOREACH(gap, &pp->aliases, ga_next)
+			G_PART_ADD_ALIAS(table, entry->gpe_pp, entry, gap->ga_alias);
 		entry->gpe_pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE;
 		entry->gpe_pp->private = entry;		/* Close the circle. */
 	}
Index: head/sys/geom/part/g_part_if.m
===================================================================
--- head/sys/geom/part/g_part_if.m
+++ head/sys/geom/part/g_part_if.m
@@ -52,6 +52,34 @@
 		    G_PART_NAME(table, entry, buf, sizeof(buf)));
 	}
 
+	static struct g_provider *
+	default_new_provider(struct g_part_table *table, struct g_geom *gp,
+	    struct g_part_entry *entry, const char *pfx)
+	{
+		struct g_provider *ret;
+		struct sbuf *sb;
+
+		sb = sbuf_new_auto();
+		G_PART_FULLNAME(table, entry, sb, pfx);
+		sbuf_finish(sb);
+		ret = g_new_providerf(gp, "%s", sbuf_data(sb));
+		sbuf_delete(sb);
+		return (ret);
+	}
+
+	static void
+	default_add_alias(struct g_part_table *table, struct g_provider *pp,
+	    struct g_part_entry *entry, const char *pfx)
+	{
+		struct sbuf *sb;
+
+		sb = sbuf_new_auto();
+		G_PART_FULLNAME(table, entry, sb, pfx);
+		sbuf_finish(sb);
+		g_provider_add_alias(pp, "%s", sbuf_data(sb));
+		sbuf_delete(sb);
+	}
+
 	static int
 	default_precheck(struct g_part_table *t __unused,
 	    enum g_part_ctl r __unused, struct g_part_parms *p __unused)
@@ -88,6 +116,15 @@
 	struct g_part_parms *gpp;
 };
 
+# add_alias() - Create aliases for the partition's provider with the given
+# alias prefixes.
+METHOD void add_alias {
+	struct g_part_table *table;
+	struct g_provider *pp;
+	struct g_part_entry *entry;
+	const char *pfx;
+} DEFAULT default_add_alias;
+
 # bootcode() - scheme specific processing for the bootcode verb.
 METHOD int bootcode {
 	struct g_part_table *table;
@@ -144,6 +181,14 @@
 	struct g_part_entry *entry;
 	struct g_part_parms *gpp;
 };
+
+# new_provider() - Create the partition's provider(s).
+METHOD struct g_provider * new_provider {
+	struct g_part_table *table;
+	struct g_geom *gp;
+	struct g_part_entry *entry;
+	const char *pfx;
+} DEFAULT default_new_provider;
 
 # resize() - scheme specific processing for the resize verb.
 METHOD int resize {