108 lines
3.5 KiB
C
108 lines
3.5 KiB
C
/*
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* linux/drivers/acorn/scsi/queue.h: queue handling
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*
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* Copyright (C) 1997 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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 list_head head;
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struct list_head free;
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spinlock_t queue_lock;
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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: struct 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 : struct scsi_cmnd if successful (and a reference), or NULL if no command available
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*/
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extern struct scsi_cmnd *queue_remove (Queue_t *queue);
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/*
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* Function: struct scsi_cmnd *queue_remove_exclude_ref (queue, exclude)
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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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* Returns : struct scsi_cmnd if successful (and a reference), or NULL if no command available
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*/
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extern struct scsi_cmnd *queue_remove_exclude(Queue_t *queue,
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unsigned long *exclude);
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#define queue_add_cmd_ordered(queue,SCpnt) \
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__queue_add(queue,SCpnt,(SCpnt)->cmnd[0] == REQUEST_SENSE)
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#define queue_add_cmd_tail(queue,SCpnt) \
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__queue_add(queue,SCpnt,0)
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/*
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* Function: int __queue_add(Queue_t *queue, struct scsi_cmnd *SCpnt, int head)
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* Purpose : Add a new command onto a queue
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* Params : queue - destination queue
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* SCpnt - command to add
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* head - add command to head of queue
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* Returns : 0 on error, !0 on success
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*/
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extern int __queue_add(Queue_t *queue, struct scsi_cmnd *SCpnt, int head);
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/*
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* Function: struct 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 : struct scsi_cmnd if successful, or NULL if no command satisfies requirements
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*/
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extern struct scsi_cmnd *queue_remove_tgtluntag(Queue_t *queue, int target,
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int lun, int tag);
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/*
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* Function: queue_remove_all_target(queue, target)
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* Purpose : remove all SCSI commands from the queue for a specified target
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* Params : queue - queue to remove command from
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* target - target device id
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* Returns : nothing
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*/
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extern void queue_remove_all_target(Queue_t *queue, int target);
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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_remove_cmd (Queue_t *queue, struct 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_remove_cmd(Queue_t *queue, struct scsi_cmnd *SCpnt);
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#endif /* QUEUE_H */
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