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/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index d5057bc..66e9058 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -46,6 +46,22 @@
* to the scsi lld. */
};
+enum scsi_device_event {
+ SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */
+
+ SDEV_EVT_LAST = SDEV_EVT_MEDIA_CHANGE,
+ SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1
+};
+
+struct scsi_event {
+ enum scsi_device_event evt_type;
+ struct list_head node;
+
+ /* put union of data structures, for non-simple event types,
+ * here
+ */
+};
+
struct scsi_device {
struct Scsi_Host *host;
struct request_queue *request_queue;
@@ -127,6 +143,10 @@
unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
+ DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
+ struct list_head event_list; /* asserted events */
+ struct work_struct event_work;
+
unsigned int device_blocked; /* Device returned QUEUE_FULL. */
unsigned int max_device_blocked; /* what device_blocked counts down from */
@@ -275,6 +295,11 @@
int retries);
extern int scsi_device_set_state(struct scsi_device *sdev,
enum scsi_device_state state);
+extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
+ gfp_t gfpflags);
+extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
+extern void sdev_evt_send_simple(struct scsi_device *sdev,
+ enum scsi_device_event evt_type, gfp_t gfpflags);
extern int scsi_device_quiesce(struct scsi_device *sdev);
extern void scsi_device_resume(struct scsi_device *sdev);
extern void scsi_target_quiesce(struct scsi_target *);