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| author | Hannes Reinecke <hare@suse.de> | 2013-01-30 10:26:12 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-07-01 17:31:17 +0200 |
| commit | 1f1ee9ad6b298400c7a44f860231ac1d3cb7bfd6 (patch) | |
| tree | 969a5275d669b6af5ae09d173e19e19256e74903 /drivers/s390/block/dasd_devmap.c | |
| parent | s390/dasd: Clarify comment (diff) | |
| download | linux-1f1ee9ad6b298400c7a44f860231ac1d3cb7bfd6.tar.xz linux-1f1ee9ad6b298400c7a44f860231ac1d3cb7bfd6.zip | |
s390/dasd: make number of retries configurable
Instead of having the number of retries hard-coded in the various
functions we should be using a default retry value, which can
be modified via sysfs.
Signed-off-by: Hannes Reinecke <hare@suse.de>
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_devmap.c')
| -rw-r--r-- | drivers/s390/block/dasd_devmap.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c index a71bb8aaca1d..bc3e7afac18b 100644 --- a/drivers/s390/block/dasd_devmap.c +++ b/drivers/s390/block/dasd_devmap.c @@ -1240,6 +1240,46 @@ dasd_expires_store(struct device *dev, struct device_attribute *attr, static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store); +static ssize_t +dasd_retries_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_retries); + dasd_put_device(device); + return len; +} + +static ssize_t +dasd_retries_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_RETRIES_MAX)) { + dasd_put_device(device); + return -EINVAL; + } + + if (val) + device->default_retries = val; + + dasd_put_device(device); + return count; +} + +static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store); + static ssize_t dasd_reservation_policy_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -1350,6 +1390,7 @@ static struct attribute * dasd_attrs[] = { &dev_attr_erplog.attr, &dev_attr_failfast.attr, &dev_attr_expires.attr, + &dev_attr_retries.attr, &dev_attr_reservation_policy.attr, &dev_attr_last_known_reservation_state.attr, &dev_attr_safe_offline.attr, |