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