From a6abdbfc7e216e5c84009fabbc8cff99a880485d Mon Sep 17 00:00:00 2001
From: Kay Sievers <kay.sievers@vrfy.org>
Date: Fri, 4 May 2007 16:54:46 +0200
Subject: [PATCH] volume_id: add DDF support

---
 extras/volume_id/lib/Makefile         |  1 +
 extras/volume_id/lib/ddf_raid.c       | 64 +++++++++++++++++++++++++++
 extras/volume_id/lib/exported_symbols |  1 +
 extras/volume_id/lib/libvolume_id.h   |  1 +
 4 files changed, 67 insertions(+)
 create mode 100644 extras/volume_id/lib/ddf_raid.c

diff --git a/extras/volume_id/lib/Makefile b/extras/volume_id/lib/Makefile
index 5618b96a..b73172e3 100644
--- a/extras/volume_id/lib/Makefile
+++ b/extras/volume_id/lib/Makefile
@@ -30,6 +30,7 @@ OBJS=				\
 	promise_raid.o		\
 	adaptec_raid.o		\
 	jmicron_raid.o		\
+	ddf_raid.o		\
 	iso9660.o		\
 	jfs.o			\
 	linux_raid.o		\
diff --git a/extras/volume_id/lib/ddf_raid.c b/extras/volume_id/lib/ddf_raid.c
new file mode 100644
index 00000000..9ac5c91e
--- /dev/null
+++ b/extras/volume_id/lib/ddf_raid.c
@@ -0,0 +1,64 @@
+/*
+ * volume_id - reads filesystem label and uuid
+ *
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ *	This program is free software; you can redistribute it and/or modify it
+ *	under the terms of the GNU General Public License as published by the
+ *	Free Software Foundation version 2 of the License.
+ */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#endif
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <ctype.h>
+#include <byteswap.h>
+
+#include "libvolume_id.h"
+#include "util.h"
+
+#define DDF_HEADER			0xDE11DE11
+#define DDF_GUID_LENGTH			24
+#define DDF_REV_LENGTH			8
+
+static struct ddf_header {
+	uint32_t	signature;
+	uint32_t	crc;
+	uint8_t		guid[DDF_GUID_LENGTH];
+	uint8_t		ddf_rev[DDF_REV_LENGTH];
+} PACKED *ddf;
+
+int volume_id_probe_ddf_raid(struct volume_id *id, uint64_t off, uint64_t size)
+{
+	uint64_t ddf_off = ((size / 0x200)-1) * 0x200;
+	const uint8_t *buf;
+
+	info("probing at offset 0x%llx, size 0x%llx",
+	    (unsigned long long) off, (unsigned long long) size);
+	if (size < 0x10000)
+		return -1;
+
+	buf = volume_id_get_buffer(id, off + ddf_off, 0x200);
+	if (buf == NULL)
+		return -1;
+	ddf = (struct ddf_header *) buf;
+
+	if (ddf->signature != cpu_to_be32(DDF_HEADER))
+		return -1;
+
+	volume_id_set_uuid(id, ddf->guid, DDF_GUID_LENGTH, UUID_STRING);
+	snprintf(id->type_version, DDF_REV_LENGTH, "%s", ddf->ddf_rev);
+	volume_id_set_usage(id, VOLUME_ID_RAID);
+	id->type = "ddf_raid_member";
+	return 0;
+}
diff --git a/extras/volume_id/lib/exported_symbols b/extras/volume_id/lib/exported_symbols
index c88d993e..d11634a9 100644
--- a/extras/volume_id/lib/exported_symbols
+++ b/extras/volume_id/lib/exported_symbols
@@ -44,6 +44,7 @@
 	volume_id_probe_linux_raid;
 	volume_id_probe_lvm1;
 	volume_id_probe_lvm2;
+	volume_id_probe_ddf_raid;
 	volume_id_probe_intel_software_raid;
 	volume_id_probe_highpoint_37x_raid;
 	volume_id_probe_highpoint_45x_raid;
diff --git a/extras/volume_id/lib/libvolume_id.h b/extras/volume_id/lib/libvolume_id.h
index 523543f7..adfc75cb 100644
--- a/extras/volume_id/lib/libvolume_id.h
+++ b/extras/volume_id/lib/libvolume_id.h
@@ -103,6 +103,7 @@ extern int volume_id_probe_luks(struct volume_id *id, uint64_t off, uint64_t siz
 extern int volume_id_probe_linux_raid(struct volume_id *id, uint64_t off, uint64_t size);
 extern int volume_id_probe_lvm1(struct volume_id *id, uint64_t off, uint64_t size);
 extern int volume_id_probe_lvm2(struct volume_id *id, uint64_t off, uint64_t size);
+extern int volume_id_probe_ddf_raid(struct volume_id *id, uint64_t off, uint64_t size);
 
 /* bios raid */
 extern int volume_id_probe_intel_software_raid(struct volume_id *id, uint64_t off, uint64_t size);
-- 
2.39.5