/* *  linux/drivers/acorn/scsi/queue.h: queue handling * *  Copyright (C) 1997 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */#ifndef QUEUE_H#define QUEUE_Htypedef struct {	struct list_head head;	struct list_head free;	spinlock_t queue_lock;	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) * Purpose : remove a SCSI command from a queue * Params  : queue   - queue to remove command from *	     exclude - array of busy LUNs * Returns : Scsi_Cmnd if successful (and a reference), or NULL if no command available */extern Scsi_Cmnd *queue_remove_exclude (Queue_t *queue, void *exclude);#define queue_add_cmd_ordered(queue,SCpnt) \	__queue_add(queue,SCpnt,(SCpnt)->cmnd[0] == REQUEST_SENSE)#define queue_add_cmd_tail(queue,SCpnt) \	__queue_add(queue,SCpnt,0)/* * Function: int __queue_add(Queue_t *queue, Scsi_Cmnd *SCpnt, int head) * Purpose : Add a new command onto a queue * Params  : queue - destination queue *	     SCpnt - command to add *	     head  - add command to head of queue * Returns : 0 on error, !0 on success */extern int __queue_add(Queue_t *queue, Scsi_Cmnd *SCpnt, int head);/* * 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_remove_cmd (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_remove_cmd(Queue_t *queue, Scsi_Cmnd *SCpnt);#endif /* QUEUE_H */