volume_id: better DDF raid detection

diff --git a/extras/volume_id/lib/ddf_raid.c b/extras/volume_id/lib/ddf_raid.c
index bf24fe0..53d309b 100644 (file)
--- a/extras/volume_id/lib/ddf_raid.c
+++ b/extras/volume_id/lib/ddf_raid.c
@@ -34,12 +34,11 @@
 
 /* http://www.snia.org/standards/home */
 
-#define DDF_HEADER                     0xDE11DE11
 #define DDF_GUID_LENGTH                        24
 #define DDF_REV_LENGTH                 8
 
 struct ddf_header {
-       uint32_t        signature;
+       uint8_t         signature[4];
        uint32_t        crc;
        uint8_t         guid[DDF_GUID_LENGTH];
        uint8_t         ddf_rev[DDF_REV_LENGTH];
@@ -47,23 +46,47 @@ struct ddf_header {
 
 int volume_id_probe_ddf_raid(struct volume_id *id, uint64_t off, uint64_t size)
 {
-       uint64_t ddf_off = ((size / 0x200)-1) * 0x200;
+       uint64_t ddf_off;
        const uint8_t *buf;
        struct ddf_header *ddf;
 
        info("probing at offset 0x%llx, size 0x%llx\n",
-           (unsigned long long) off, (unsigned long long) size);
-       if (size < 0x10000)
+            (unsigned long long)off, (unsigned long long)size);
+       if (size < 0x30000)
                return -1;
 
+       /* header at last sector */
+       ddf_off = ((size / 0x200)-1) * 0x200;
        buf = volume_id_get_buffer(id, off + ddf_off, 0x200);
        if (buf == NULL)
                return -1;
        ddf = (struct ddf_header *) buf;
+       if (memcmp(ddf->signature, "\x11\xde\x11\xde", 4) == 0) {
+               info("header (little endian) found at %llu\n", (unsigned long long)(off + ddf_off));
+               goto found;
+       }
+       if (memcmp(ddf->signature, "\xde\x11\xde\x11", 4) == 0) {
+               info("header (big endian) found at %llu\n", (unsigned long long)(off + ddf_off));
+               goto found;
+       }
 
-       if (ddf->signature != cpu_to_be32(DDF_HEADER))
+       /* adaptec non-standard header location */
+       ddf_off = ((size / 0x200)-257) * 0x200;
+       buf = volume_id_get_buffer(id, off + ddf_off, 0x200);
+       if (buf == NULL)
                return -1;
+       ddf = (struct ddf_header *) buf;
+       if (memcmp(ddf->signature, "\x11\xde\x11\xde", 4) == 0) {
+               info("header adaptec (little endian) found at %llu\n", (unsigned long long)(off + ddf_off));
+               goto found;
+       }
+       if (memcmp(ddf->signature, "\xde\x11\xde\x11", 4) == 0) {
+               info("header adaptec (big endian) found at %llu\n", (unsigned long long)(off + ddf_off));
+               goto found;
+       }
 
+       return -1;
+found:
        volume_id_set_uuid(id, ddf->guid, DDF_GUID_LENGTH, UUID_STRING);
        snprintf(id->type_version, DDF_REV_LENGTH, "%s", ddf->ddf_rev);
        volume_id_set_usage(id, VOLUME_ID_RAID);