From de7684a309ad20c1b889d048d741cb1dd52245f7 Mon Sep 17 00:00:00 2001
From: Denis Vlasenko
Date: Mon, 18 Feb 2008 21:08:49 +0000
Subject: support for mount by label (not yet tested) Also adds findfs applet.
 Closes bug 1143.

---
 util-linux/volume_id/lvm.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 util-linux/volume_id/lvm.c

(limited to 'util-linux/volume_id/lvm.c')

diff --git a/util-linux/volume_id/lvm.c b/util-linux/volume_id/lvm.c
new file mode 100644
index 0000000..baa8456
--- /dev/null
+++ b/util-linux/volume_id/lvm.c
@@ -0,0 +1,91 @@
+/*
+ * volume_id - reads filesystem label and uuid
+ *
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ *	This library is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU Lesser General Public
+ *	License as published by the Free Software Foundation; either
+ *	version 2.1 of the License, or (at your option) any later version.
+ *
+ *	This library is distributed in the hope that it will be useful,
+ *	but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ *	Lesser General Public License for more details.
+ *
+ *	You should have received a copy of the GNU Lesser General Public
+ *	License along with this library; if not, write to the Free Software
+ *	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "volume_id_internal.h"
+
+struct lvm1_super_block {
+	uint8_t	id[2];
+} __attribute__((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];
+} __attribute__((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 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;
+}
-- 
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