volume_id: old md metadata has only 32 bit for the uuid

diff --git a/extras/volume_id/lib/linux_raid.c b/extras/volume_id/lib/linux_raid.c
index 009c714bd1d54fb8445e334f80f891f28bb5425a..8ce2eb52daa9ff1f84054725334a64ce1ae7227f 100644 (file)
--- a/extras/volume_id/lib/linux_raid.c
+++ b/extras/volume_id/lib/linux_raid.c
@@ -78,9 +78,15 @@ static int volume_id_probe_linux_raid0(struct volume_id *id, uint64_t off, uint6
 
        if (le32_to_cpu(mdp0->md_magic) == MD_SB_MAGIC) {
                uuid.ints[0] = bswap_32(mdp0->set_uuid0);
-               uuid.ints[1] = bswap_32(mdp0->set_uuid1);
-               uuid.ints[2] = bswap_32(mdp0->set_uuid2);
-               uuid.ints[3] = bswap_32(mdp0->set_uuid3);
+               if (le32_to_cpu(mdp0->minor_version >= 90)) {
+                       uuid.ints[1] = bswap_32(mdp0->set_uuid1);
+                       uuid.ints[2] = bswap_32(mdp0->set_uuid2);
+                       uuid.ints[3] = bswap_32(mdp0->set_uuid3);
+               } else {
+                       uuid.ints[1] = 0;
+                       uuid.ints[2] = 0;
+                       uuid.ints[3] = 0;
+               }
                volume_id_set_uuid(id, uuid.bytes, UUID_DCE);
                snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
                         le32_to_cpu(mdp0->major_version),
@@ -88,9 +94,15 @@ static int volume_id_probe_linux_raid0(struct volume_id *id, uint64_t off, uint6
                         le32_to_cpu(mdp0->patch_version));
        } else if (be32_to_cpu(mdp0->md_magic) == MD_SB_MAGIC) {
                uuid.ints[0] = mdp0->set_uuid0;
-               uuid.ints[1] = mdp0->set_uuid1;
-               uuid.ints[2] = mdp0->set_uuid2;
-               uuid.ints[3] = mdp0->set_uuid3;
+               if (be32_to_cpu(mdp0->minor_version >= 90)) {
+                       uuid.ints[1] = mdp0->set_uuid1;
+                       uuid.ints[2] = mdp0->set_uuid2;
+                       uuid.ints[3] = mdp0->set_uuid3;
+               } else {
+                       uuid.ints[1] = 0;
+                       uuid.ints[2] = 0;
+                       uuid.ints[3] = 0;
+               }
                volume_id_set_uuid(id, uuid.bytes, UUID_DCE);
                snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
                         be32_to_cpu(mdp0->major_version),