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| author | Stefan Weinhuber <wein@de.ibm.com> | 2011-01-05 12:48:04 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2011-01-05 12:47:30 +0100 |
| commit | 5a27e60dec59a95bd7f8ae9a19ae2ede4f76395b (patch) | |
| tree | 20595cba0caebf7a8a5f0afac9785c7d717f3e8c /drivers/s390/block/dasd_int.h | |
| parent | a4d26c6aeceea330ee5e0fb6b017d57e3b252d29 (diff) | |
| download | op-kernel-dev-5a27e60dec59a95bd7f8ae9a19ae2ede4f76395b.zip op-kernel-dev-5a27e60dec59a95bd7f8ae9a19ae2ede4f76395b.tar.gz | |
[S390] dasd: Improve handling of stolen DASD reservation
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>
Diffstat (limited to 'drivers/s390/block/dasd_int.h')
| -rw-r--r-- | drivers/s390/block/dasd_int.h | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h index ba038ef..df9f699 100644 --- a/drivers/s390/block/dasd_int.h +++ b/drivers/s390/block/dasd_int.h @@ -232,6 +232,10 @@ struct dasd_ccw_req { #define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */ #define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */ #define DASD_CQR_VERIFY_PATH 2 /* path verification request */ +#define DASD_CQR_ALLOW_SLOCK 3 /* Try this request even when lock was + * stolen. Should not be combined with + * DASD_CQR_FLAGS_USE_ERP + */ /* Signature for error recovery functions. */ typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *); @@ -334,9 +338,9 @@ struct dasd_discipline { void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *, struct irb *); void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *); - - void (*handle_unsolicited_interrupt) (struct dasd_device *, - struct irb *); + void (*check_for_device_change) (struct dasd_device *, + struct dasd_ccw_req *, + struct irb *); /* i/o control functions. */ int (*fill_geometry) (struct dasd_block *, struct hd_geometry *); @@ -473,6 +477,9 @@ struct dasd_block { * confuse this with the user specified * read-only feature. */ +#define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */ +#define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */ + void dasd_put_device_wake(struct dasd_device *); |
