[PATCH] s390: dasd extended error reporting
The DASD extended error reporting is a facility that allows to get detailed
information about certain problems in the DASD I/O. This information can be
used to implement fail-over applications that can recover these problems.
Signed-off-by: Stefan Weinhuber <wein@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>
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 9e0b371..f32f744 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -151,6 +151,8 @@
static inline void
dasd_state_known_to_new(struct dasd_device * device)
{
+ /* Disable extended error reporting for this device. */
+ dasd_eer_disable(device);
/* Forget the discipline information. */
if (device->discipline)
module_put(device->discipline->owner);
@@ -892,6 +894,9 @@
struct dasd_ccw_req *cqr;
struct list_head *l, *n;
+ /* First of all start sense subsystem status request. */
+ dasd_eer_snss(device);
+
device->stopped &= ~DASD_STOPPED_PENDING;
/* restart all 'running' IO on queue */
@@ -1111,6 +1116,19 @@
}
goto restart;
}
+
+ /* First of all call extended error reporting. */
+ if (dasd_eer_enabled(device) &&
+ cqr->status == DASD_CQR_FAILED) {
+ dasd_eer_write(device, cqr, DASD_EER_FATALERROR);
+
+ /* restart request */
+ cqr->status = DASD_CQR_QUEUED;
+ cqr->retries = 255;
+ device->stopped |= DASD_STOPPED_QUIESCE;
+ goto restart;
+ }
+
/* Process finished ERP request. */
if (cqr->refers) {
__dasd_process_erp(device, cqr);
@@ -1248,7 +1266,8 @@
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)) {
+ test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
+ (!dasd_eer_enabled(device))) {
cqr->status = DASD_CQR_FAILED;
dasd_schedule_bh(device);
}
@@ -1807,6 +1826,7 @@
#ifdef CONFIG_PROC_FS
dasd_proc_exit();
#endif
+ dasd_eer_exit();
if (dasd_page_cache != NULL) {
kmem_cache_destroy(dasd_page_cache);
dasd_page_cache = NULL;
@@ -2003,6 +2023,9 @@
switch (event) {
case CIO_GONE:
case CIO_NO_PATH:
+ /* First of all call extended error reporting. */
+ dasd_eer_write(device, NULL, DASD_EER_NOPATH);
+
if (device->state < DASD_STATE_BASIC)
break;
/* Device is active. We want to keep it. */
@@ -2060,6 +2083,7 @@
put_driver(drv);
}
+
static int __init
dasd_init(void)
{
@@ -2092,6 +2116,9 @@
rc = dasd_parse();
if (rc)
goto failed;
+ rc = dasd_eer_init();
+ if (rc)
+ goto failed;
#ifdef CONFIG_PROC_FS
rc = dasd_proc_init();
if (rc)