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authorHannes Reinecke <hare@suse.de>2013-01-30 09:26:12 +0000
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-07-01 17:31:17 +0200
commit1f1ee9ad6b298400c7a44f860231ac1d3cb7bfd6 (patch)
tree969a5275d669b6af5ae09d173e19e19256e74903 /drivers/s390/block/dasd_devmap.c
parentb99a946de6a988a38043180d42e6b7a2f07d4f57 (diff)
downloadlinux-1f1ee9ad6b298400c7a44f860231ac1d3cb7bfd6.tar.bz2
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.c41
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,