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[S390] dasd: tunable missing interrupt handler

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This feature provides a user interface to specify the timeout for
missing interrupts for standard I/O operations.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Stefan Haberland
2010-08-09 18:13:00 +02:00
committed by Martin Schwidefsky
parent f932bcea6b
commit 7c8faa8629
6 changed files with 81 additions and 9 deletions
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44
drivers/s390/block/dasd_devmap.c
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@@ -1083,6 +1083,49 @@ dasd_eer_store(struct device *dev, struct device_attribute *attr,
static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
/*
* expiration time for default requests
*/
static ssize_t
dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct dasd_device *device;
int len;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
return -ENODEV;
len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires);
dasd_put_device(device);
return len;
}
static ssize_t
dasd_expires_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct dasd_device *device;
unsigned long val;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
return -ENODEV;
if ((strict_strtoul(buf, 10, &val) != 0) ||
(val > DASD_EXPIRES_MAX) || val == 0) {
dasd_put_device(device);
return -EINVAL;
}
if (val)
device->default_expires = val;
dasd_put_device(device);
return count;
}
static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
static struct attribute * dasd_attrs[] = {
&dev_attr_readonly.attr,
&dev_attr_discipline.attr,
@@ -1094,6 +1137,7 @@ static struct attribute * dasd_attrs[] = {
&dev_attr_eer_enabled.attr,
&dev_attr_erplog.attr,
&dev_attr_failfast.attr,
&dev_attr_expires.attr,
NULL,
};