[S390] dasd: Add support for enhanced VM UID
When z/VM provides two virtual devices (minidisks) that reside on the
same real device, both will receive the configuration data from the
real device and thus get the same uid. To fix this problem, z/VM
provides an additional configuration data record that allows to
distinguish between minidisks.
z/VM APAR VM64273 needs be installed so this fix has an effect.
Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/block/dasd_alias.c b/drivers/s390/block/dasd_alias.c
index 2d8df0b..20676cd 100644
--- a/drivers/s390/block/dasd_alias.c
+++ b/drivers/s390/block/dasd_alias.c
@@ -91,7 +91,8 @@
else
search_unit_addr = uid->base_unit_addr;
list_for_each_entry(pos, &lcu->grouplist, group) {
- if (pos->uid.base_unit_addr == search_unit_addr)
+ if (pos->uid.base_unit_addr == search_unit_addr &&
+ !strncmp(pos->uid.vduit, uid->vduit, sizeof(uid->vduit)))
return pos;
};
return NULL;
@@ -332,6 +333,7 @@
group->uid.base_unit_addr = uid->real_unit_addr;
else
group->uid.base_unit_addr = uid->base_unit_addr;
+ memcpy(group->uid.vduit, uid->vduit, sizeof(uid->vduit));
INIT_LIST_HEAD(&group->group);
INIT_LIST_HEAD(&group->baselist);
INIT_LIST_HEAD(&group->aliaslist);