Home | History | Annotate | Line # | Download | only in raidframe 
      1 /*	$NetBSD: rf_fifo.h,v 1.7 2021/07/23 20:18:24 oster Exp $	*/
      2 /*
      3  * Copyright (c) 1995 Carnegie-Mellon University.
      4  * All rights reserved.
      5  *
      6  * Author: Mark Holland
      7  *
      8  * Permission to use, copy, modify and distribute this software and
      9  * its documentation is hereby granted, provided that both the copyright
     10  * notice and this permission notice appear in all copies of the
     11  * software, derivative works or modified versions, and any portions
     12  * thereof, and that both notices appear in supporting documentation.
     13  *
     14  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     15  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     16  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     17  *
     18  * Carnegie Mellon requests users of this software to return to
     19  *
     20  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     21  *  School of Computer Science
     22  *  Carnegie Mellon University
     23  *  Pittsburgh PA 15213-3890
     24  *
     25  * any improvements or extensions that they make and grant Carnegie the
     26  * rights to redistribute these changes.
     27  */
     28 
     29 /*
     30  * rf_fifo.h --  prioritized FIFO queue code.
     31  *
     32  * 4-9-93 Created (MCH)
     33  */
     34 
     35 
     36 #ifndef _RF__RF_FIFO_H_
     37 #define _RF__RF_FIFO_H_
     38 
     39 #include <dev/raidframe/raidframevar.h>
     40 
     41 #include "rf_archs.h"
     42 #include "rf_diskqueue.h"
     43 
     44 typedef struct RF_FifoHeader_s {
     45 	RF_DiskQueueData_t *hq_head, *hq_tail;	/* high priority requests */
     46 	RF_DiskQueueData_t *lq_head, *lq_tail;	/* low priority requests */
     47 	int     hq_count, lq_count;	/* debug only */
     48 }       RF_FifoHeader_t;
     49 
     50 extern void *
     51 rf_FifoCreate(RF_SectorCount_t sectPerDisk,
     52     RF_AllocListElem_t * clList, RF_ShutdownList_t ** listp);
     53 extern void
     54 rf_FifoEnqueue(void *q_in, RF_DiskQueueData_t * elem,
     55     int priority);
     56 extern RF_DiskQueueData_t *rf_FifoDequeue(void *q_in);
     57 extern int
     58 rf_FifoPromote(void *q_in, RF_StripeNum_t parityStripeID,
     59     RF_ReconUnitNum_t which_ru);
     60 
     61 #endif				/* !_RF__RF_FIFO_H_ */
     62