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;
+}