1 files changed, 97 insertions, 0 deletions
diff --git a/extras/volume_id/lib/lvm.c b/extras/volume_id/lib/lvm.c
new file mode 100644
index 0000000000..47d84b0968
--- /dev/null
+++ b/extras/volume_id/lib/lvm.c
@@ -0,0 +1,97 @@
+/*
+ * 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 "libvolume_id.h"
+#include "util.h"
+
+struct lvm1_super_block {
+	uint8_t	id[2];
+} PACKED;
+
+struct lvm2_super_block {
+	uint8_t		id[8];
+	uint64_t	sector_xl;
+	uint32_t	crc_xl;
+	uint32_t	offset_xl;
+	uint8_t		type[8];
+} PACKED;
+
+#define LVM1_SB_OFF			0x400
+#define LVM1_MAGIC			"HM"
+
+int volume_id_probe_lvm1(struct volume_id *id, uint64_t off)
+{
+	const uint8_t *buf;
+	struct lvm1_super_block *lvm;
+
+	dbg("probing at offset 0x%llx", (unsigned long long) off);
+
+	buf = volume_id_get_buffer(id, off + LVM1_SB_OFF, 0x800);
+	if (buf == NULL)
+		return -1;
+
+	lvm = (struct lvm1_super_block *) buf;
+
+	if (memcmp(lvm->id, LVM1_MAGIC, 2) != 0)
+		return -1;
+
+	volume_id_set_usage(id, VOLUME_ID_RAID);
+	id->type = "LVM1_member";
+
+	return 0;
+}
+
+#define LVM2_LABEL_ID			"LABELONE"
+#define LVM2LABEL_SCAN_SECTORS		4
+
+int volume_id_probe_lvm2(struct volume_id *id, uint64_t off)
+{
+	const uint8_t *buf;
+	unsigned int soff;
+	struct lvm2_super_block *lvm;
+
+	dbg("probing at offset 0x%llx", (unsigned long long) off);
+
+	buf = volume_id_get_buffer(id, off, LVM2LABEL_SCAN_SECTORS * 0x200);
+	if (buf == NULL)
+		return -1;
+
+
+	for (soff = 0; soff < LVM2LABEL_SCAN_SECTORS * 0x200; soff += 0x200) {
+		lvm = (struct lvm2_super_block *) &buf[soff];
+
+		if (memcmp(lvm->id, LVM2_LABEL_ID, 8) == 0)
+			goto found;
+	}
+
+	return -1;
+
+found:
+	memcpy(id->type_version, lvm->type, 8);
+	volume_id_set_usage(id, VOLUME_ID_RAID);
+	id->type = "LVM2_member";
+
+	return 0;
+}