Merge branch 'master' of gregkh@master.kernel.org:/pub/scm/linux/hotplug/udev

1 files changed, 88 insertions, 0 deletions

diff --git a/extras/volume_id/libvolume_id/linux_raid.c b/extras/volume_id/libvolume_id/linux_raid.c
new file mode 100644
index 0000000000..d90510a817
--- /dev/null
+++ b/extras/volume_id/libvolume_id/linux_raid.c
@@ -0,0 +1,88 @@
+/*
+ * 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 "volume_id.h"
+#include "logging.h"
+#include "util.h"
+
+struct mdp_super_block {
+	uint32_t	md_magic;
+	uint32_t	major_version;
+	uint32_t	minor_version;
+	uint32_t	patch_version;
+	uint32_t	gvalid_words;
+	uint32_t	set_uuid0;
+	uint32_t	ctime;
+	uint32_t	level;
+	uint32_t	size;
+	uint32_t	nr_disks;
+	uint32_t	raid_disks;
+	uint32_t	md_minor;
+	uint32_t	not_persistent;
+	uint32_t	set_uuid1;
+	uint32_t	set_uuid2;
+	uint32_t	set_uuid3;
+} __attribute__((packed)) *mdp;
+
+#define MD_RESERVED_BYTES		0x10000
+#define MD_MAGIC			0xa92b4efc
+
+int volume_id_probe_linux_raid(struct volume_id *id, uint64_t off, uint64_t size)
+{
+	const uint8_t *buf;
+	uint64_t sboff;
+	uint8_t uuid[16];
+
+	dbg("probing at offset 0x%llx, size 0x%llx",
+	    (unsigned long long) off, (unsigned long long) size);
+
+	if (size < 0x10000)
+		return -1;
+
+	sboff = (size & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES;
+	buf = volume_id_get_buffer(id, off + sboff, 0x800);
+	if (buf == NULL)
+		return -1;
+
+	mdp = (struct mdp_super_block *) buf;
+
+	if (le32_to_cpu(mdp->md_magic) != MD_MAGIC)
+		return -1;
+
+	memcpy(uuid, &mdp->set_uuid0, 4);
+	memcpy(&uuid[4], &mdp->set_uuid1, 12);
+	volume_id_set_uuid(id, uuid, UUID_DCE);
+
+	snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
+		 le32_to_cpu(mdp->major_version),
+		 le32_to_cpu(mdp->minor_version),
+		 le32_to_cpu(mdp->patch_version));
+
+	dbg("found raid signature");
+	volume_id_set_usage(id, VOLUME_ID_RAID);
+	id->type = "linux_raid_member";
+
+	return 0;
+}