[patch 24/38] dasd: Add sysfs attribute status and generate uevents.

Martin Schwidefsky
2007-04-27T14:13:22Z

[-- Attachment #1: 127-dasd-status.diff --]
[-- Type: text/plain, Size: 2976 bytes --]

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.

Signed-off-by: Horst Hummel <horst.hummel@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

drivers/s390/block/dasd.c | 3 ++
drivers/s390/block/dasd_devmap.c | 41 +++++++++++++++++++++++++++++++++++++++
2 files changed, 44 insertions(+)

Index: quilt-2.6/drivers/s390/block/dasd.c
===================================================================
--- quilt-2.6.orig/drivers/s390/block/dasd.c 2007-04-27 16:01:49.000000000 +0200
+++ quilt-2.6/drivers/s390/block/dasd.c 2007-04-27 16:04:58.000000000 +0200
@@ -398,6 +398,9 @@

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: quilt-2.6/drivers/s390/block/dasd_devmap.c
===================================================================
--- quilt-2.6.orig/drivers/s390/block/dasd_devmap.c 2007-04-27 16:01:49.000000000 +0200
+++ quilt-2.6/drivers/s390/block/dasd_devmap.c 2007-04-27 16:04:58.000000000 +0200
@@ -829,6 +829,46 @@
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 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,