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/* $OpenBSD: rf_sstf.h,v 1.3 2002/12/16 07:01:05 tdeval Exp $ */
/* $NetBSD: rf_sstf.h,v 1.3 1999/02/05 00:06:17 oster Exp $ */
/*
* Copyright (c) 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Jim Zelenka
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
#ifndef _RF__RF_SSTF_H_
#define _RF__RF_SSTF_H_
#include "rf_diskqueue.h"
typedef struct RF_SstfQ_s {
RF_DiskQueueData_t *queue;
RF_DiskQueueData_t *qtail;
int qlen;
} RF_SstfQ_t;
typedef struct RF_Sstf_s {
RF_SstfQ_t left;
RF_SstfQ_t right;
RF_SstfQ_t lopri;
RF_SectorNum_t last_sector;
int dir;
int allow_reverse;
} RF_Sstf_t;
void *rf_SstfCreate(RF_SectorCount_t, RF_AllocListElem_t *,
RF_ShutdownList_t **);
void *rf_ScanCreate(RF_SectorCount_t, RF_AllocListElem_t *,
RF_ShutdownList_t **);
void *rf_CscanCreate(RF_SectorCount_t, RF_AllocListElem_t *,
RF_ShutdownList_t **);
void rf_SstfEnqueue(void *, RF_DiskQueueData_t *, int);
RF_DiskQueueData_t *rf_SstfDequeue(void *);
RF_DiskQueueData_t *rf_SstfPeek(void *);
int rf_SstfPromote(void *, RF_StripeNum_t, RF_ReconUnitNum_t);
RF_DiskQueueData_t *rf_ScanDequeue(void *);
RF_DiskQueueData_t *rf_ScanPeek(void *);
RF_DiskQueueData_t *rf_CscanDequeue(void *);
RF_DiskQueueData_t *rf_CscanPeek(void *);
#endif /* !_RF__RF_SSTF_H_ */
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