SCSI: add asynchronous event notification API
Originally based on a patch by Kristen Carlson Accardi @ Intel.
Copious input from James Bottomley.
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index d531cee..f374fdc 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -268,6 +268,7 @@
struct scsi_device *sdev;
struct device *parent;
struct scsi_target *starget;
+ struct list_head *this, *tmp;
unsigned long flags;
sdev = container_of(work, struct scsi_device, ew.work);
@@ -282,6 +283,16 @@
list_del(&sdev->starved_entry);
spin_unlock_irqrestore(sdev->host->host_lock, flags);
+ cancel_work_sync(&sdev->event_work);
+
+ list_for_each_safe(this, tmp, &sdev->event_list) {
+ struct scsi_event *evt;
+
+ evt = list_entry(this, struct scsi_event, node);
+ list_del(&evt->node);
+ kfree(evt);
+ }
+
if (sdev->request_queue) {
sdev->request_queue->queuedata = NULL;
/* user context needed to free queue */
@@ -614,6 +625,41 @@
}
static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
+#define DECLARE_EVT_SHOW(name, Cap_name) \
+static ssize_t \
+sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
+ char *buf) \
+{ \
+ struct scsi_device *sdev = to_scsi_device(dev); \
+ int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
+ return snprintf(buf, 20, "%d\n", val); \
+}
+
+#define DECLARE_EVT_STORE(name, Cap_name) \
+static ssize_t \
+sdev_store_evt_##name(struct device *dev, struct device_attribute *attr, \
+ const char *buf, size_t count) \
+{ \
+ struct scsi_device *sdev = to_scsi_device(dev); \
+ int val = simple_strtoul(buf, NULL, 0); \
+ if (val == 0) \
+ clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
+ else if (val == 1) \
+ set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
+ else \
+ return -EINVAL; \
+ return count; \
+}
+
+#define DECLARE_EVT(name, Cap_name) \
+ DECLARE_EVT_SHOW(name, Cap_name) \
+ DECLARE_EVT_STORE(name, Cap_name) \
+ static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \
+ sdev_store_evt_##name);
+#define REF_EVT(name) &dev_attr_evt_##name.attr
+
+DECLARE_EVT(media_change, MEDIA_CHANGE)
+
/* Default template for device attributes. May NOT be modified */
static struct attribute *scsi_sdev_attrs[] = {
&dev_attr_device_blocked.attr,
@@ -631,6 +677,7 @@
&dev_attr_iodone_cnt.attr,
&dev_attr_ioerr_cnt.attr,
&dev_attr_modalias.attr,
+ REF_EVT(media_change),
NULL
};