dasd: fix error recovery for alias devices during format
Kernel panic or a hanging device during format if an alias device is
set offline or I/O errors occur.
Omit the error recovery procedure for alias devices and do retries on
the base device with full erp.
Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 925b056..5df05f2 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -2307,17 +2307,27 @@
rc = 0;
list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
- if (__dasd_sleep_on_erp(cqr)) {
- if (!cqr->status == DASD_CQR_TERMINATED &&
- !cqr->status == DASD_CQR_NEED_ERP)
- break;
- rc = 1;
+ /*
+ * for alias devices simplify error recovery and
+ * return to upper layer
+ */
+ if (cqr->startdev != cqr->basedev &&
+ (cqr->status == DASD_CQR_TERMINATED ||
+ cqr->status == DASD_CQR_NEED_ERP))
+ return -EAGAIN;
+ else {
+ /* normal recovery for basedev IO */
+ if (__dasd_sleep_on_erp(cqr)) {
+ if (!cqr->status == DASD_CQR_TERMINATED &&
+ !cqr->status == DASD_CQR_NEED_ERP)
+ break;
+ rc = 1;
+ }
}
}
if (rc)
goto retry;
-
return 0;
}
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 39748fd..e74e5f7 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -2061,11 +2061,12 @@
static struct dasd_ccw_req *
dasd_eckd_build_format(struct dasd_device *base,
- struct format_data_t *fdata)
+ struct format_data_t *fdata,
+ int enable_PAV)
{
struct dasd_eckd_private *base_priv;
struct dasd_eckd_private *start_priv;
- struct dasd_device *startdev;
+ struct dasd_device *startdev = NULL;
struct dasd_ccw_req *fcp;
struct eckd_count *ect;
struct ch_t address;
@@ -2079,7 +2080,9 @@
int nr_tracks;
int use_prefix;
- startdev = dasd_alias_get_start_dev(base);
+ if (enable_PAV)
+ startdev = dasd_alias_get_start_dev(base);
+
if (!startdev)
startdev = base;
@@ -2309,6 +2312,7 @@
fcp->startdev = startdev;
fcp->memdev = startdev;
+ fcp->basedev = base;
fcp->retries = 256;
fcp->expires = startdev->default_expires * HZ;
fcp->buildclk = get_tod_clock();
@@ -2319,7 +2323,8 @@
static int
dasd_eckd_format_device(struct dasd_device *base,
- struct format_data_t *fdata)
+ struct format_data_t *fdata,
+ int enable_PAV)
{
struct dasd_ccw_req *cqr, *n;
struct dasd_block *block;
@@ -2327,7 +2332,7 @@
struct list_head format_queue;
struct dasd_device *device;
int old_stop, format_step;
- int step, rc = 0;
+ int step, rc = 0, sleep_rc;
block = base->block;
private = (struct dasd_eckd_private *) base->private;
@@ -2361,11 +2366,11 @@
}
INIT_LIST_HEAD(&format_queue);
- old_stop = fdata->stop_unit;
+ old_stop = fdata->stop_unit;
while (fdata->start_unit <= 1) {
fdata->stop_unit = fdata->start_unit;
- cqr = dasd_eckd_build_format(base, fdata);
+ cqr = dasd_eckd_build_format(base, fdata, enable_PAV);
list_add(&cqr->blocklist, &format_queue);
fdata->stop_unit = old_stop;
@@ -2383,7 +2388,7 @@
if (step > format_step)
fdata->stop_unit = fdata->start_unit + format_step - 1;
- cqr = dasd_eckd_build_format(base, fdata);
+ cqr = dasd_eckd_build_format(base, fdata, enable_PAV);
if (IS_ERR(cqr)) {
if (PTR_ERR(cqr) == -ENOMEM) {
/*
@@ -2403,7 +2408,7 @@
}
sleep:
- dasd_sleep_on_queue(&format_queue);
+ sleep_rc = dasd_sleep_on_queue(&format_queue);
list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
device = cqr->startdev;
@@ -2415,6 +2420,9 @@
private->count--;
}
+ if (sleep_rc)
+ return sleep_rc;
+
/*
* in case of ENOMEM we need to retry after
* first requests are finished
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h
index 7a14582..2cc188c 100644
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -175,6 +175,7 @@
struct dasd_block *block; /* the originating block device */
struct dasd_device *memdev; /* the device used to allocate this */
struct dasd_device *startdev; /* device the request is started on */
+ struct dasd_device *basedev; /* base device if no block->base */
void *cpaddr; /* address of ccw or tcw */
unsigned char cpmode; /* 0 = cmd mode, 1 = itcw */
char status; /* status of this request */
@@ -321,7 +322,7 @@
int (*term_IO) (struct dasd_ccw_req *);
void (*handle_terminated_request) (struct dasd_ccw_req *);
int (*format_device) (struct dasd_device *,
- struct format_data_t *);
+ struct format_data_t *, int enable_PAV);
int (*free_cp) (struct dasd_ccw_req *, struct request *);
/*
diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c
index 25a0f2f..ad62608 100644
--- a/drivers/s390/block/dasd_ioctl.c
+++ b/drivers/s390/block/dasd_ioctl.c
@@ -203,7 +203,9 @@
dasd_format(struct dasd_block *block, struct format_data_t *fdata)
{
struct dasd_device *base;
- int rc;
+ int enable_PAV = 1;
+ int rc, retries;
+ int start, stop;
base = block->base;
if (base->discipline->format_device == NULL)
@@ -231,11 +233,30 @@
bdput(bdev);
}
- rc = base->discipline->format_device(base, fdata);
- if (rc)
- return rc;
+ retries = 255;
+ /* backup start- and endtrack for retries */
+ start = fdata->start_unit;
+ stop = fdata->stop_unit;
+ do {
+ rc = base->discipline->format_device(base, fdata, enable_PAV);
+ if (rc) {
+ if (rc == -EAGAIN) {
+ retries--;
+ /* disable PAV in case of errors */
+ enable_PAV = 0;
+ fdata->start_unit = start;
+ fdata->stop_unit = stop;
+ } else
+ return rc;
+ } else
+ /* success */
+ break;
+ } while (retries);
- return 0;
+ if (!retries)
+ return -EIO;
+ else
+ return 0;
}
/*