[S390] dasd: Add support for raw ECKD access.

Normal I/O operations through the DASD device driver give only access
to the data fields of an ECKD device even for track based I/O.
This patch extends the DASD device driver to give access to whole
ECKD tracks including count, key and data fields.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/s390/include/asm/dasd.h b/arch/s390/include/asm/dasd.h
index 47fcdada5d2..0be28efe5b6 100644
--- a/arch/s390/include/asm/dasd.h
+++ b/arch/s390/include/asm/dasd.h
@@ -73,6 +73,7 @@ typedef struct dasd_information2_t {
  * 0x02: use diag discipline (diag)
  * 0x04: set the device initially online (internal use only)
  * 0x08: enable ERP related logging
+ * 0x20: give access to raw eckd data
  */
 #define DASD_FEATURE_DEFAULT         0x00
 #define DASD_FEATURE_READONLY        0x01
@@ -81,6 +82,7 @@ typedef struct dasd_information2_t {
 #define DASD_FEATURE_ERPLOG          0x08
 #define DASD_FEATURE_FAILFAST        0x10
 #define DASD_FEATURE_FAILONSLCK      0x20
+#define DASD_FEATURE_USERAW          0x40
 
 #define DASD_PARTN_BITS 2