[SCSI] zfcp: attach and release SAN nameserver port on demand

Changing the zfcp behaviour from always having the nameserver port
open to an on-demand strategy.  This strategy reduces the use of
limited resources like port connections. The patch provides a common
infrastructure which could be used for all WKA ports in future.

Also reduce the number of nameserver lookups by changing the zfcp
behaviour of always querying the nameserver for the corresponding
destination ID of the remote port.  If the destination ID has changed
during the reopen process we will be informed and then trigger a
nameserver query on demand.

Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 2 insertions, 17 deletions

diff --git a/drivers/s390/scsi/zfcp_sysfs.c b/drivers/s390/scsi/zfcp_sysfs.c
index 7e857571fe44..430e486e9183 100644
--- a/drivers/s390/scsi/zfcp_sysfs.c
+++ b/drivers/s390/scsi/zfcp_sysfs.c
@@ -273,22 +273,7 @@ out:
 }
 static DEVICE_ATTR(unit_remove, S_IWUSR, NULL, zfcp_sysfs_unit_remove_store);
 
-static struct attribute *zfcp_port_ns_attrs[] = {
-        &dev_attr_port_failed.attr,
-        &dev_attr_port_in_recovery.attr,
-        &dev_attr_port_status.attr,
-        &dev_attr_port_access_denied.attr,
-        NULL
-};
-
-/**
- * zfcp_sysfs_ns_port_attrs - sysfs attributes for nameserver
- */
-struct attribute_group zfcp_sysfs_ns_port_attrs = {
-        .attrs = zfcp_port_ns_attrs,
-};
-
-static struct attribute *zfcp_port_no_ns_attrs[] = {
+static struct attribute *zfcp_port_attrs[] = {
         &dev_attr_unit_add.attr,
         &dev_attr_unit_remove.attr,
         &dev_attr_port_failed.attr,
@@ -302,7 +287,7 @@ static struct attribute *zfcp_port_no_ns_attrs[] = {
  * zfcp_sysfs_port_attrs - sysfs attributes for all other ports
  */
 struct attribute_group zfcp_sysfs_port_attrs = {
-        .attrs = zfcp_port_no_ns_attrs,
+        .attrs = zfcp_port_attrs,
 };
 
 static struct attribute *zfcp_unit_attrs[] = {