patch-2.1.88 linux/drivers/acorn/scsi/queue.h

• Lines: 107
• Date: Thu Sep 25 14:35:09 1997
• Orig file: v2.1.87/linux/drivers/acorn/scsi/queue.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.87/linux/drivers/acorn/scsi/queue.h linux/drivers/acorn/scsi/queue.h
@@ -0,0 +1,106 @@
+/*
+ * queue.h: queue handling
+ *
+ * (c) 1997 Russell King
+ */
+#ifndef QUEUE_H
+#define QUEUE_H
+
+typedef struct {
+	struct queue_entry *head;		/* head of queue */
+	struct queue_entry *tail;		/* tail of queue */
+	struct queue_entry *free;		/* free list */
+	void *alloc;				/* start of allocated mem */
+} Queue_t;
+
+/*
+ * Function: void queue_initialise (Queue_t *queue)
+ * Purpose : initialise a queue
+ * Params  : queue - queue to initialise
+ */
+extern int queue_initialise (Queue_t *queue);
+
+/*
+ * Function: void queue_free (Queue_t *queue)
+ * Purpose : free a queue
+ * Params  : queue - queue to free
+ */
+extern void queue_free (Queue_t *queue);
+
+/*
+ * Function: Scsi_Cmnd *queue_remove (queue)
+ * Purpose : removes first SCSI command from a queue
+ * Params  : queue   - queue to remove command from
+ * Returns : Scsi_Cmnd if successful (and a reference), or NULL if no command available
+ */
+extern Scsi_Cmnd *queue_remove (Queue_t *queue);
+
+/*
+ * Function: Scsi_Cmnd *queue_remove_exclude_ref (queue, exclude, ref)
+ * Purpose : remove a SCSI command from a queue
+ * Params  : queue   - queue to remove command from
+ *	     exclude - array of busy LUNs
+ *	     ref     - a reference that can be used to put the command back
+ * Returns : Scsi_Cmnd if successful (and a reference), or NULL if no command available
+ */
+extern Scsi_Cmnd *queue_remove_exclude (Queue_t *queue, unsigned char *exclude);
+
+/*
+ * Function: int queue_add_cmd_ordered (Queue_t *queue, Scsi_Cmnd *SCpnt)
+ * Purpose : Add a new command onto a queue, queueing REQUEST_SENSE first
+ * Params  : queue - destination queue
+ *	     SCpnt - command to add
+ * Returns : 0 on error, !0 on success
+ */
+extern int queue_add_cmd_ordered (Queue_t *queue, Scsi_Cmnd *SCpnt);
+
+/*
+ * Function: int queue_add_cmd_tail (Queue_t *queue, Scsi_Cmnd *SCpnt)
+ * Purpose : Add a new command onto a queue, queueing at end of list
+ * Params  : queue - destination queue
+ *	     SCpnt - command to add
+ * Returns : 0 on error, !0 on success
+ */
+extern int queue_add_cmd_tail (Queue_t *queue, Scsi_Cmnd *SCpnt);
+
+/*
+ * Function: Scsi_Cmnd *queue_remove_tgtluntag (queue, target, lun, tag)
+ * Purpose : remove a SCSI command from the queue for a specified target/lun/tag
+ * Params  : queue  - queue to remove command from
+ *	     target - target that we want
+ *	     lun    - lun on device
+ *	     tag    - tag on device
+ * Returns : Scsi_Cmnd if successful, or NULL if no command satisfies requirements
+ */
+extern Scsi_Cmnd *queue_remove_tgtluntag (Queue_t *queue, int target, int lun, int tag);
+
+/*
+ * Function: int queue_probetgtlun (queue, target, lun)
+ * Purpose : check to see if we have a command in the queue for the specified
+ *	     target/lun.
+ * Params  : queue  - queue to look in
+ *	     target - target we want to probe
+ *	     lun    - lun on target
+ * Returns : 0 if not found, != 0 if found
+ */
+extern int queue_probetgtlun (Queue_t *queue, int target, int lun);
+
+/*
+ * Function: int queue_cmdonqueue (queue, SCpnt)
+ * Purpose : check to see if we have a command on the queue
+ * Params  : queue - queue to look in
+ *	     SCpnt - command to find
+ * Returns : 0 if not found, != 0 if found
+ */
+int queue_cmdonqueue (Queue_t *queue, Scsi_Cmnd *SCpnt);
+
+/*
+ * Function: int queue_removecmd (Queue_t *queue, Scsi_Cmnd *SCpnt)
+ * Purpose : remove a specific command from the queues
+ * Params  : queue - queue to look in
+ *	     SCpnt - command to find
+ * Returns : 0 if not found
+ */
+int queue_removecmd (Queue_t *queue, Scsi_Cmnd *SCpnt);
+
+#endif /* QUEUE_H */