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authorStefan Weinhuber <wein@de.ibm.com>2011-01-05 12:48:04 +0100
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2011-01-05 12:47:30 +0100
commit5a27e60dec59a95bd7f8ae9a19ae2ede4f76395b (patch)
tree20595cba0caebf7a8a5f0afac9785c7d717f3e8c /drivers/s390/block/dasd_int.h
parenta4d26c6aeceea330ee5e0fb6b017d57e3b252d29 (diff)
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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.h13
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 *);
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