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@xxxxxxxxxxxxx>
Reviewed-by: Jan Hoeppner <hoeppner@xxxxxxxxxxxxx>
---
drivers/s390/block/dasd_devmap.c | 36 ++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c
index c7c948c55761..95c7959c7949 100644
--- a/drivers/s390/block/dasd_devmap.c
+++ b/drivers/s390/block/dasd_devmap.c
@@ -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,
};
--
2.37.2
