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Subject[patch 6/8] dasd: Add sysfs attribute status and generate uevents.
From: Horst Hummel <horst.hummel@de.ibm.com>

This patch adds a sysfs-attribute 'status' to make the DASD device-status
accessible from user-space. In addition, the DASD driver generates an
uevent(CHANGE) for the ccw-device on each device-status change.
This enables user-space applications (e.g. udev) to do related processing.

Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Horst Hummel <horst.hummel@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
---
drivers/s390/block/dasd.c | 3 ++
drivers/s390/block/dasd_devmap.c | 41 +++++++++++++++++++++++++++++++++++++++
2 files changed, 44 insertions(+)
Index: linux-2.6/drivers/s390/block/dasd.c
===================================================================
--- linux-2.6.orig/drivers/s390/block/dasd.c
+++ linux-2.6/drivers/s390/block/dasd.c
@@ -398,6 +398,9 @@ dasd_change_state(struct dasd_device *de

if (device->state == device->target)
wake_up(&dasd_init_waitq);
+
+ /* let user-space know that the device status changed */
+ kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
}

/*
Index: linux-2.6/drivers/s390/block/dasd_devmap.c
===================================================================
--- linux-2.6.orig/drivers/s390/block/dasd_devmap.c
+++ linux-2.6/drivers/s390/block/dasd_devmap.c
@@ -829,6 +829,46 @@ dasd_discipline_show(struct device *dev,
static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);

static ssize_t
+dasd_device_status_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct dasd_device *device;
+ ssize_t len;
+
+ device = dasd_device_from_cdev(to_ccwdev(dev));
+ if (!IS_ERR(device)) {
+ switch (device->state) {
+ case DASD_STATE_NEW:
+ len = snprintf(buf, PAGE_SIZE, "new\n");
+ break;
+ case DASD_STATE_KNOWN:
+ len = snprintf(buf, PAGE_SIZE, "detected\n");
+ break;
+ case DASD_STATE_BASIC:
+ len = snprintf(buf, PAGE_SIZE, "basic\n");
+ break;
+ case DASD_STATE_UNFMT:
+ len = snprintf(buf, PAGE_SIZE, "unformatted\n");
+ break;
+ case DASD_STATE_READY:
+ len = snprintf(buf, PAGE_SIZE, "ready\n");
+ break;
+ case DASD_STATE_ONLINE:
+ len = snprintf(buf, PAGE_SIZE, "online\n");
+ break;
+ default:
+ len = snprintf(buf, PAGE_SIZE, "no stat\n");
+ break;
+ }
+ dasd_put_device(device);
+ } else
+ len = snprintf(buf, PAGE_SIZE, "unknown\n");
+ return len;
+}
+
+static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
+
+static ssize_t
dasd_alias_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct dasd_devmap *devmap;
@@ -939,6 +979,7 @@ static DEVICE_ATTR(eer_enabled, 0644, da
static struct attribute * dasd_attrs[] = {
&dev_attr_readonly.attr,
&dev_attr_discipline.attr,
+ &dev_attr_status.attr,
&dev_attr_alias.attr,
&dev_attr_vendor.attr,
&dev_attr_uid.attr,
--
-
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