int creating_imsm; /* flag to indicate container creation */
int current_vol; /* index of raid device undergoing creation */
__u32 create_offset; /* common start for 'current_vol' */
+ __u32 random; /* random data for seeding new family numbers */
struct intel_dev *devlist;
struct dl {
struct dl *next;
printf(" Magic : %s\n", str);
snprintf(str, strlen(MPB_VERSION_RAID0), "%s", get_imsm_version(mpb));
printf(" Version : %s\n", get_imsm_version(mpb));
+ printf(" Orig Family : %08x\n", __le32_to_cpu(mpb->orig_family_num));
printf(" Family : %08x\n", __le32_to_cpu(mpb->family_num));
printf(" Generation : %08x\n", __le32_to_cpu(mpb->generation_num));
getinfo_super_imsm(st, &info);
/* the imsm metadata format does not specify any host
* identification information. We return -1 since we can never
* confirm nor deny whether a given array is "meant" for this
- * host. We rely on compare_super and the 'family_num' field to
+ * host. We rely on compare_super and the 'family_num' fields to
* exclude member disks that do not belong, and we rely on
* mdadm.conf to specify the arrays that should be assembled.
* Auto-assembly may still pick up "foreign" arrays.
*/
/* imsm does not track uuid's so we synthesis one using sha1 on
* - The signature (Which is constant for all imsm array, but no matter)
- * - the family_num of the container
+ * - the orig_family_num of the container
* - the index number of the volume
* - the 'serial' number of the volume.
* Hopefully these are all constant.
char buf[20];
struct sha1_ctx ctx;
struct imsm_dev *dev = NULL;
+ __u32 family_num;
+ /* some mdadm versions failed to set ->orig_family_num, in which
+ * case fall back to ->family_num. orig_family_num will be
+ * fixed up with the first metadata update.
+ */
+ family_num = super->anchor->orig_family_num;
+ if (family_num == 0)
+ family_num = super->anchor->family_num;
sha1_init_ctx(&ctx);
sha1_process_bytes(super->anchor->sig, MPB_SIG_LEN, &ctx);
- sha1_process_bytes(&super->anchor->family_num, sizeof(__u32), &ctx);
+ sha1_process_bytes(&family_num, sizeof(__u32), &ctx);
if (super->current_vol >= 0)
dev = get_imsm_dev(super, super->current_vol);
if (dev) {
*/
if (first->anchor->num_raid_devs > 0 &&
sec->anchor->num_raid_devs > 0) {
- if (first->anchor->family_num != sec->anchor->family_num)
+ if (first->anchor->orig_family_num != sec->anchor->orig_family_num ||
+ first->anchor->family_num != sec->anchor->family_num)
return 3;
}
imsm_copy_dev(get_imsm_dev(first, i), get_imsm_dev(sec, i));
first->anchor->num_raid_devs = sec->anchor->num_raid_devs;
+ first->anchor->orig_family_num = sec->anchor->orig_family_num;
first->anchor->family_num = sec->anchor->family_num;
}
*_dev = *dev;
*_disk = dl->disk;
- sum = __gen_imsm_checksum(mpb);
+ sum = random32();
+ sum += __gen_imsm_checksum(mpb);
mpb->family_num = __cpu_to_le32(sum);
+ mpb->orig_family_num = mpb->family_num;
}
return 0;
mpb->disk[0] = d->disk;
sum = __gen_imsm_checksum(mpb);
mpb->family_num = __cpu_to_le32(sum);
+ mpb->orig_family_num = 0;
sum = __gen_imsm_checksum(mpb);
mpb->check_sum = __cpu_to_le32(sum);
generation++;
mpb->generation_num = __cpu_to_le32(generation);
+ /* fix up cases where previous mdadm releases failed to set
+ * orig_family_num
+ */
+ if (mpb->orig_family_num == 0)
+ mpb->orig_family_num = mpb->family_num;
+
mpb_size += sizeof(struct imsm_disk) * mpb->num_disks;
for (d = super->disks; d; d = d->next) {
if (d->index == -1)
di->data_offset = __le32_to_cpu(map->pba_of_lba0);
di->component_size = a->info.component_size;
di->container_member = inst;
+ super->random = random32();
di->next = rv;
rv = di;
num_spares++;
set_imsm_ord_tbl_ent(map, u->slot, dl->index);
set_imsm_ord_tbl_ent(migr_map, u->slot, dl->index | IMSM_ORD_REBUILD);
+ /* update the family_num to mark a new container
+ * generation, being careful to record the existing
+ * family_num in orig_family_num to clean up after
+ * earlier mdadm versions that neglected to set it.
+ */
+ if (mpb->orig_family_num == 0)
+ mpb->orig_family_num = mpb->family_num;
+ mpb->family_num += super->random;
+
/* count arrays using the victim in the metadata */
found = 0;
for (a = st->arrays; a ; a = a->next) {