[SCSI] iscsi class: sysfs group is_visible callout for iscsi host attrs

The iscsi class currently does not support writable sysfs
attrs for LLD sysfs settings. This patch converts the
iscsi class and driver's host attrs to use the attribute
container sysfs group and the sysfs group's is_visible callout
to be able to support readable or writable sysfs attrs.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/infiniband/ulp/iser/iscsi_iser.c

@@ -635,6 +635,15 @@ iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
 static mode_t iser_attr_is_visible(int param_type, int param)
 {
 	switch (param_type) {
+	case ISCSI_HOST_PARAM:
+		switch (param) {
+		case ISCSI_HOST_PARAM_NETDEV_NAME:
+		case ISCSI_HOST_PARAM_HWADDRESS:
+		case ISCSI_HOST_PARAM_INITIATOR_NAME:
+			return S_IRUGO;
+		default:
+			return 0;
+		}
 	case ISCSI_PARAM:
 		switch (param) {
 		case ISCSI_PARAM_MAX_RECV_DLENGTH:
@@ -697,9 +706,6 @@ static struct iscsi_transport iscsi_iser_transport = {
 	.owner                  = THIS_MODULE,
 	.name                   = "iser",
 	.caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T,
-	.host_param_mask	= ISCSI_HOST_HWADDRESS |
-				  ISCSI_HOST_NETDEV_NAME |
-				  ISCSI_HOST_INITIATOR_NAME,
 	/* session management */
 	.create_session         = iscsi_iser_session_create,
 	.destroy_session        = iscsi_iser_session_destroy,