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author | Stefan Haberland <stefan.haberland@de.ibm.com> | 2010-08-09 18:13:00 +0200 |
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committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2010-08-09 18:12:54 +0200 |
commit | 7c8faa86290c1a2607d6b768a0b874ec392a5c2a (patch) | |
tree | 7cb94efdbd3ce3c5eb8fb7a2b7d8a5bedebcb1a2 /drivers/s390/block/dasd_devmap.c | |
parent | f932bcea6b7317312ab38df12a84710fc6c67a81 (diff) | |
download | linux-stable-7c8faa86290c1a2607d6b768a0b874ec392a5c2a.tar.gz linux-stable-7c8faa86290c1a2607d6b768a0b874ec392a5c2a.tar.bz2 linux-stable-7c8faa86290c1a2607d6b768a0b874ec392a5c2a.zip |
[S390] dasd: tunable missing interrupt handler
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>
Diffstat (limited to 'drivers/s390/block/dasd_devmap.c')
-rw-r--r-- | drivers/s390/block/dasd_devmap.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c index bed7b4634ccd..8d41f3ed38d7 100644 --- a/drivers/s390/block/dasd_devmap.c +++ b/drivers/s390/block/dasd_devmap.c @@ -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, }; |