From 0e1f4526b425401a4ef882b5b1f104384e1f3c15 Mon Sep 17 00:00:00 2001
From: Stefan Huber <shuber@sthu.org>
Date: Sun, 23 Dec 2012 21:57:29 +0100
Subject: [PATCH] diskio: Fix byte counting on dmcrypt block devices

Byte counting failes if disk is a dmcrypt block device, i.e, if
major==DM_MAJOR. Fix this.
---
 src/linux.cc | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/linux.cc b/src/linux.cc
index f6f85c0d..06907699 100644
--- a/src/linux.cc
+++ b/src/linux.cc
@@ -79,6 +79,10 @@
 #define NBD_MAJOR 43
 #endif
 
+#if !defined(DM_MAJOR)
+#define DM_MAJOR 253
+#endif
+
 #ifdef BUILD_WLAN
 #include <iwlib.h>
 #endif
@@ -2435,7 +2439,8 @@ int update_diskio(void)
 		 *
 		 * XXX: ignore devices which are part of a SW RAID (MD_MAJOR) */
 		if (col_count == 5 && major != LVM_BLK_MAJOR && major != NBD_MAJOR
-				&& major != RAMDISK_MAJOR && major != LOOP_MAJOR) {
+				&& major != RAMDISK_MAJOR && major != LOOP_MAJOR
+				&& major != DM_MAJOR) {
 			/* check needed for kernel >= 2.6.31, see sf #2942117 */
 			if (is_disk(devbuf)) {
 				total_reads += reads;