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[/] [or1k_old/] [trunk/] [rc203soc/] [sw/] [uClinux/] [arch/] [armnommu/] [drivers/] [scsi/] [queue.h] - Rev 1782
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/* * 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 */