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authorStefan Weinhuber <wein@de.ibm.com>2008-08-01 16:39:09 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-08-01 16:39:29 +0200
commit4abb08c24b5fa7b6ad0807c07077f0f216f6788b (patch)
treeeb907a86ecb4ac1171972460e8440f6815a7a037 /drivers/s390/block/dasd_devmap.c
parentc2bb4e5d497823437f0a11d342024ccdc6ff5b0d (diff)
[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>
Diffstat (limited to 'drivers/s390/block/dasd_devmap.c')
-rw-r--r--drivers/s390/block/dasd_devmap.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c
index d774e79476f..cd3335c1c30 100644
--- a/drivers/s390/block/dasd_devmap.c
+++ b/drivers/s390/block/dasd_devmap.c
@@ -913,7 +913,8 @@ dasd_vendor_show(struct device *dev, struct device_attribute *attr, char *buf)
static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
#define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\
- /* SSID */ 4 + 1 + /* unit addr */ 2 + 1)
+ /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 +\
+ /* vduit */ 32 + 1)
static ssize_t
dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
@@ -945,8 +946,17 @@ dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
sprintf(ua_string, "%02x", uid->real_unit_addr);
break;
}
- snprintf(uid_string, sizeof(uid_string), "%s.%s.%04x.%s",
- uid->vendor, uid->serial, uid->ssid, ua_string);
+ if (strlen(uid->vduit) > 0)
+ snprintf(uid_string, sizeof(uid_string),
+ "%s.%s.%04x.%s.%s",
+ uid->vendor, uid->serial,
+ uid->ssid, ua_string,
+ uid->vduit);
+ else
+ snprintf(uid_string, sizeof(uid_string),
+ "%s.%s.%04x.%s",
+ uid->vendor, uid->serial,
+ uid->ssid, ua_string);
spin_unlock(&dasd_devmap_lock);
return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
}