From 2181ce4a5726c4c72e68e6964b7ef7442e507707 Mon Sep 17 00:00:00 2001
From: Alexey Obitotskiy <aleksey.obitotskiy@intel.com>
Date: Fri, 24 Jun 2016 11:59:35 +0200
Subject: [PATCH] libblkid: Add metadata signature check for IMSM on 4Kn drives

Drives with 512 and 4K sectors have different offset for
metadata signature. Without signature detected on 4Kn drives
those drives will not be recognized as raid member. This
patch adds checking for IMSM signature for 4Kn drives.

Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1451704
Signed-off-by: Alexey Obitotskiy <aleksey.obitotskiy@intel.com>
Signed-off-by: Karel Zak <kzak@redhat.com>
---
 libblkid/src/superblocks/isw_raid.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/libblkid/src/superblocks/isw_raid.c b/libblkid/src/superblocks/isw_raid.c
index 065c2b2..81d53a1 100644
--- a/libblkid/src/superblocks/isw_raid.c
+++ b/libblkid/src/superblocks/isw_raid.c
@@ -25,11 +25,11 @@ struct isw_metadata {
 
 #define ISW_SIGNATURE		"Intel Raid ISM Cfg Sig. "
 
-
 static int probe_iswraid(blkid_probe pr,
 		const struct blkid_idmag *mag __attribute__((__unused__)))
 {
 	uint64_t off;
+	unsigned int sector_size;
 	struct isw_metadata *isw;
 
 	if (pr->size < 0x10000)
@@ -37,16 +37,17 @@ static int probe_iswraid(blkid_probe pr,
 	if (!S_ISREG(pr->mode) && !blkid_probe_is_wholedisk(pr))
 		return 1;
 
-	off = ((pr->size / 0x200) - 2) * 0x200;
-	isw = (struct isw_metadata *)
-			blkid_probe_get_buffer(pr,
-					off,
-					sizeof(struct isw_metadata));
+	sector_size = blkid_probe_get_sectorsize(pr);
+	off = ((pr->size / sector_size) - 2) * sector_size;
+
+	isw = (struct isw_metadata *)blkid_probe_get_buffer(pr,
+			off, sizeof(struct isw_metadata));
 	if (!isw)
 		return errno ? -errno : 1;
 
 	if (memcmp(isw->sig, ISW_SIGNATURE, sizeof(ISW_SIGNATURE)-1) != 0)
 		return 1;
+
 	if (blkid_probe_sprintf_version(pr, "%6s",
 			&isw->sig[sizeof(ISW_SIGNATURE)-1]) != 0)
 		return 1;
-- 
2.9.4