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s390/dasd: add aq_requeue sysfs attribute

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Add a sysfs attribute to control if all IO requests will be requeued to
the blocklayer in case of an autoquiesce event or not.

A value of 1 means that in case of an autoquiesce event all IO requests
will be requeued to the blocklayer.

A value of 0 means that the device will only be stopped.

Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Link: https://lore.kernel.org/r/20230405142017.2446986-5-sth@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Stefan Haberland 2023-04-05 16:20:14 +02:00 committed by Jens Axboe
parent 9558a8e9d4
commit bdac94e295
1 changed files with 36 additions and 0 deletions
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36
drivers/s390/block/dasd_devmap.c
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@ -1517,6 +1517,41 @@ static ssize_t dasd_aq_mask_store(struct device *dev, struct device_attribute *a
static DEVICE_ATTR(aq_mask, 0644, dasd_aq_mask_show, dasd_aq_mask_store);
/*
* aq_requeue controls if requests are returned to the blocklayer on quiesce
* or if requests are only not started
*/
static ssize_t dasd_aqr_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct dasd_devmap *devmap;
int flag;
devmap = dasd_find_busid(dev_name(dev));
if (!IS_ERR(devmap))
flag = (devmap->features & DASD_FEATURE_REQUEUEQUIESCE) != 0;
else
flag = (DASD_FEATURE_DEFAULT &
DASD_FEATURE_REQUEUEQUIESCE) != 0;
return sysfs_emit(buf, "%d\n", flag);
}
static ssize_t dasd_aqr_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
bool val;
int rc;
if (kstrtobool(buf, &val))
return -EINVAL;
rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_REQUEUEQUIESCE, val);
return rc ? : count;
}
static DEVICE_ATTR(aq_requeue, 0644, dasd_aqr_show, dasd_aqr_store);
/*
* expiration time for default requests
*/
@ -2367,6 +2402,7 @@ static struct attribute * dasd_attrs[] = {
&dev_attr_copy_role.attr,
&dev_attr_ping.attr,
&dev_attr_aq_mask.attr,
&dev_attr_aq_requeue.attr,
NULL,
};