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[PATCH] s390: dasd failfast support 

To properly support multipath-failover handling, the linux block layer has
introduced a special request flag, 'REQ_FAILFAST'.  This flag is now used to
return requests immediately in case the device is not operational.

Signed-off-by: Horst Hummel <horst.hummel@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Horst Hummel 2006-01-06 00:19:15 -08:00 committed by Linus Torvalds
parent 9a7af28966
commit 1c01b8a596
5 changed files with 34 additions and 12 deletions
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28
drivers/s390/block/dasd.c
View File

@ -7,7 +7,7 @@
* Bugreports.to..: <Linux390@de.ibm.com>
* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
*
* $Revision: 1.169 $
* $Revision: 1.172 $
*/
#include <linux/config.h>
@ -1224,6 +1224,12 @@ __dasd_start_head(struct dasd_device * device)
if (list_empty(&device->ccw_queue))
return;
cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list);
/* check FAILFAST */
if (device->stopped & ~DASD_STOPPED_PENDING &&
test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags)) {
cqr->status = DASD_CQR_FAILED;
dasd_schedule_bh(device);
}
if ((cqr->status == DASD_CQR_QUEUED) &&
(!device->stopped)) {
/* try to start the first I/O that can be started */
@ -1750,8 +1756,10 @@ dasd_exit(void)
* SECTION: common functions for ccw_driver use
*/
/* initial attempt at a probe function. this can be simplified once
* the other detection code is gone */
/*
* Initial attempt at a probe function. this can be simplified once
* the other detection code is gone.
*/
int
dasd_generic_probe (struct ccw_device *cdev,
struct dasd_discipline *discipline)
@ -1770,8 +1778,10 @@ dasd_generic_probe (struct ccw_device *cdev,
return ret;
}
/* this will one day be called from a global not_oper handler.
* It is also used by driver_unregister during module unload */
/*
* This will one day be called from a global not_oper handler.
* It is also used by driver_unregister during module unload.
*/
void
dasd_generic_remove (struct ccw_device *cdev)
{
@ -1798,9 +1808,11 @@ dasd_generic_remove (struct ccw_device *cdev)
dasd_delete_device(device);
}
/* activate a device. This is called from dasd_{eckd,fba}_probe() when either
/*
* Activate a device. This is called from dasd_{eckd,fba}_probe() when either
* the device is detected for the first time and is supposed to be used
* or the user has started activation through sysfs */
* or the user has started activation through sysfs.
*/
int
dasd_generic_set_online (struct ccw_device *cdev,
struct dasd_discipline *discipline)
@ -1917,7 +1929,6 @@ dasd_generic_notify(struct ccw_device *cdev, int event)
if (cqr->status == DASD_CQR_IN_IO)
cqr->status = DASD_CQR_FAILED;
device->stopped |= DASD_STOPPED_DC_EIO;
dasd_schedule_bh(device);
} else {
list_for_each_entry(cqr, &device->ccw_queue, list)
if (cqr->status == DASD_CQR_IN_IO) {
@ -1927,6 +1938,7 @@ dasd_generic_notify(struct ccw_device *cdev, int event)
device->stopped |= DASD_STOPPED_DC_WAIT;
dasd_set_timer(device, 0);
}
dasd_schedule_bh(device);
ret = 1;
break;
case CIO_OPER:

4
drivers/s390/block/dasd_diag.c
View File

@ -6,7 +6,7 @@
* Bugreports.to..: <Linux390@de.ibm.com>
* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
*
* $Revision: 1.52 $
* $Revision: 1.53 $
*/
#include <linux/config.h>
@ -549,6 +549,8 @@ dasd_diag_build_cp(struct dasd_device * device, struct request *req)
}
cqr->retries = DIAG_MAX_RETRIES;
cqr->buildclk = get_clock();
if (req->flags & REQ_FAILFAST)
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
cqr->device = device;
cqr->expires = DIAG_TIMEOUT;
cqr->status = DASD_CQR_FILLED;

7
drivers/s390/block/dasd_eckd.c
View File

@ -7,7 +7,7 @@
* Bugreports.to..: <Linux390@de.ibm.com>
* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
*
* $Revision: 1.71 $
* $Revision: 1.74 $
*/
#include <linux/config.h>
@ -1136,6 +1136,8 @@ dasd_eckd_build_cp(struct dasd_device * device, struct request *req)
recid++;
}
}
if (req->flags & REQ_FAILFAST)
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
cqr->device = device;
cqr->expires = 5 * 60 * HZ; /* 5 minutes */
cqr->lpm = private->path_data.ppm;
@ -1252,6 +1254,7 @@ dasd_eckd_release(struct block_device *bdev, int no, long args)
cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
cqr->device = device;
clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
cqr->retries = 0;
cqr->expires = 2 * HZ;
cqr->buildclk = get_clock();
@ -1296,6 +1299,7 @@ dasd_eckd_reserve(struct block_device *bdev, int no, long args)
cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
cqr->device = device;
clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
cqr->retries = 0;
cqr->expires = 2 * HZ;
cqr->buildclk = get_clock();
@ -1339,6 +1343,7 @@ dasd_eckd_steal_lock(struct block_device *bdev, int no, long args)
cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
cqr->device = device;
clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
cqr->retries = 0;
cqr->expires = 2 * HZ;
cqr->buildclk = get_clock();

4
drivers/s390/block/dasd_fba.c
View File

@ -4,7 +4,7 @@
* Bugreports.to..: <Linux390@de.ibm.com>
* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
*
* $Revision: 1.40 $
* $Revision: 1.41 $
*/
#include <linux/config.h>
@ -352,6 +352,8 @@ dasd_fba_build_cp(struct dasd_device * device, struct request *req)
recid++;
}
}
if (req->flags & REQ_FAILFAST)
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
cqr->device = device;
cqr->expires = 5 * 60 * HZ; /* 5 minutes */
cqr->retries = 32;

3
drivers/s390/block/dasd_int.h
View File

@ -6,7 +6,7 @@
* Bugreports.to..: <Linux390@de.ibm.com>
* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
*
* $Revision: 1.65 $
* $Revision: 1.68 $
*/
#ifndef DASD_INT_H
@ -208,6 +208,7 @@ struct dasd_ccw_req {
/* per dasd_ccw_req flags */
#define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */
#define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */
/* Signature for error recovery functions. */
typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);