From 118fb264ee5e92e43a57a82a7a262a08a850b8b3 Mon Sep 17 00:00:00 2001
From: Colin Watson <cjwatson@ubuntu.com>
Date: Tue, 25 Jan 2011 16:51:23 +0000
Subject: [PATCH] Support probing multipath disks.

---
 grub-core/kern/emu/hostdisk.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/grub-core/kern/emu/hostdisk.c b/grub-core/kern/emu/hostdisk.c
index eb84d0220..ea42d945e 100644
--- a/grub-core/kern/emu/hostdisk.c
+++ b/grub-core/kern/emu/hostdisk.c
@@ -1271,6 +1271,16 @@ convert_system_partition_to_system_disk (const char *os_dev, struct stat *st)
 	      node = NULL;
 	      goto devmapper_out;
 	    }
+	  if (strncmp (node_uuid, "mpath-", 6) == 0)
+	    {
+	      /* Multipath partitions have partN-mpath-* UUIDs, and are
+		 linear mappings so are handled by
+		 grub_util_get_dm_node_linear_info.  Multipath disks are not
+		 linear mappings and must be handled specially.  */
+	      grub_dprintf ("hostdisk", "%s is a multipath disk\n", path);
+	      mapper_name = dm_tree_node_get_name (node);
+	      goto devmapper_out;
+	    }
 	  if (strncmp (node_uuid, "DMRAID-", 7) != 0)
 	    {
 	      int major, minor;