From: Martin Schwidefsky <schwidefsky@de.ibm.com>

 - Fix interrupt status examination.
 - Make dasd device attributes dependent on the devmap structure instead of
   the device structure to make them persistent and to be able to modify
   them in the offline state.
 - Allow changing the readonly attribute while dasd is online.
 - Add (diag) option to dasd= paramter.
 - Add missing spin_lock_init call.
 - Increase ref_count in dasd_device_from_cdev and add matching
   dasd_put_device pairs.
 - Adapt to notify api change in cio.
 - Fix bug in 3990 error recovery for cable pulls on ESS.
 - Replace kmap by page_address (no highmem on s/390).
 - Set correct default cache mode on ESS for eckd devices.
 - Change dasd names from "dasdx" to "dasd_<busid>_".