1 files changed, 79 insertions, 0 deletions
diff --git a/util-linux/volume_id/linux_raid.c b/util-linux/volume_id/linux_raid.c
new file mode 100644
index 000000000..bb9b3c5cf
--- /dev/null
+++ b/util-linux/volume_id/linux_raid.c
@@ -0,0 +1,79 @@
+/*
+ * 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 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));
+
+#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)
+{
+	uint64_t sboff;
+	uint8_t uuid[16];
+	struct mdp_super_block *mdp;
+
+	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;
+	mdp = volume_id_get_buffer(id, off + sboff, 0x800);
+	if (mdp == NULL)
+		return -1;
+
+	if (mdp->md_magic != cpu_to_le32(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;
+}