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      1 /*	$NetBSD: rf_sstf.h,v 1.6 2021/07/23 20:18:24 oster Exp $	*/
      2 /*
      3  * Copyright (c) 1995 Carnegie-Mellon University.
      4  * All rights reserved.
      5  *
      6  * Author: Jim Zelenka
      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 #ifndef _RF__RF_SSTF_H_
     30 #define _RF__RF_SSTF_H_
     31 
     32 #include "rf_diskqueue.h"
     33 
     34 typedef struct RF_SstfQ_s {
     35 	RF_DiskQueueData_t *queue;
     36 	RF_DiskQueueData_t *qtail;
     37 	int     qlen;
     38 }       RF_SstfQ_t;
     39 
     40 typedef struct RF_Sstf_s {
     41 	RF_SstfQ_t left;
     42 	RF_SstfQ_t right;
     43 	RF_SstfQ_t lopri;
     44 	RF_SectorNum_t last_sector;
     45 	int     dir;
     46 	int     allow_reverse;
     47 }       RF_Sstf_t;
     48 
     49 void   *
     50 rf_SstfCreate(RF_SectorCount_t sect_per_disk,
     51     RF_AllocListElem_t * cl_list, RF_ShutdownList_t ** listp);
     52 void   *
     53 rf_ScanCreate(RF_SectorCount_t sect_per_disk,
     54     RF_AllocListElem_t * cl_list, RF_ShutdownList_t ** listp);
     55 void   *
     56 rf_CscanCreate(RF_SectorCount_t sect_per_disk,
     57     RF_AllocListElem_t * cl_list, RF_ShutdownList_t ** listp);
     58 void    rf_SstfEnqueue(void *qptr, RF_DiskQueueData_t * req, int priority);
     59 RF_DiskQueueData_t *rf_SstfDequeue(void *qptr);
     60 int
     61 rf_SstfPromote(void *qptr, RF_StripeNum_t parityStripeID,
     62     RF_ReconUnitNum_t which_ru);
     63 RF_DiskQueueData_t *rf_ScanDequeue(void *qptr);
     64 RF_DiskQueueData_t *rf_CscanDequeue(void *qptr);
     65 
     66 #endif				/* !_RF__RF_SSTF_H_ */
     67