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[S390] dasd: Improve handling of stolen DASD reservation

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If a DASD device has been reserved by a Linux system, and later
this reservation is ‘stolen’ by a second system by means of an
unconditional reserve, then the first system receives a
notification about this fact. With this patch such an event can
be either ignored, as before, or it can be used to let the device
fail all I/O request, so that the device will not block anymore.

Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Stefan Weinhuber
2011-01-05 12:48:04 +01:00
committed by Martin Schwidefsky
parent a4d26c6aec
commit 5a27e60dec
7 changed files with 189 additions and 69 deletions
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arch/s390/include/asm/dasd.h
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@@ -80,6 +80,7 @@ typedef struct dasd_information2_t {
#define DASD_FEATURE_INITIAL_ONLINE 0x04
#define DASD_FEATURE_ERPLOG 0x08
#define DASD_FEATURE_FAILFAST 0x10
#define DASD_FEATURE_FAILONSLCK 0x20
#define DASD_PARTN_BITS 2