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[S390] dasd: add device attribute to disable blocking on lost paths

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When the connection between host and storage server is lost, the
dasd device driver usually blocks all I/O on affected devices and
waits for them to reappear. In some setups however it would be
better if the I/O is returned as error so that device can be
recovered by some other means, eg. in a raid or multipath setup.

Signed-off-by: Holger Smolinski <Holger.Smolinski@de.ibm.com>
Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Holger Smolinski
2009-01-09 12:14:51 +01:00
committed by Martin Schwidefsky
parent 1301809bce
commit 13de227bcd
5 changed files with 55 additions and 3 deletions
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arch/s390/include/asm/dasd.h
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@ -78,6 +78,7 @@ typedef struct dasd_information2_t {
#define DASD_FEATURE_USEDIAG 0x02
#define DASD_FEATURE_INITIAL_ONLINE 0x04
#define DASD_FEATURE_ERPLOG 0x08
#define DASD_FEATURE_FAILFAST 0x10
#define DASD_PARTN_BITS 2