s390/dasd: summarize dasd configuration data in a separate structure

Summarize the dasd configuration data in a separate structure so that
functions that need temporary config data do not need to allocate the
whole eckd_private structure.
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Link: https://lore.kernel.org/r/20211020115124.1735254-6-sth@linux.ibm.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/s390/block/dasd_eckd.h

@@ -658,16 +658,19 @@ struct dasd_conf_data {
 	struct dasd_gneq gneq;
 } __packed;
 
-struct dasd_eckd_private {
-	struct dasd_eckd_characteristics rdc_data;
-	u8 *conf_data;
-	int conf_len;
-
+struct dasd_conf {
+	u8 *data;
+	int len;
 	/* pointers to specific parts in the conf_data */
 	struct dasd_ned *ned;
 	struct dasd_sneq *sneq;
 	struct vd_sneq *vdsneq;
 	struct dasd_gneq *gneq;
+};
+
+struct dasd_eckd_private {
+	struct dasd_eckd_characteristics rdc_data;
+	struct dasd_conf conf;
 
 	struct eckd_count count_area[5];
 	int init_cqr_status;