70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/* $NetBSD: rf_sstf.h,v 1.5 2005/12/11 12:23:37 christos Exp $ */
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/*
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* Copyright (c) 1995 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Jim Zelenka
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#ifndef _RF__RF_SSTF_H_
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#define _RF__RF_SSTF_H_
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#include "rf_diskqueue.h"
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typedef struct RF_SstfQ_s {
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RF_DiskQueueData_t *queue;
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RF_DiskQueueData_t *qtail;
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int qlen;
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} RF_SstfQ_t;
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typedef struct RF_Sstf_s {
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RF_SstfQ_t left;
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RF_SstfQ_t right;
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RF_SstfQ_t lopri;
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RF_SectorNum_t last_sector;
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int dir;
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int allow_reverse;
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} RF_Sstf_t;
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void *
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rf_SstfCreate(RF_SectorCount_t sect_per_disk,
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RF_AllocListElem_t * cl_list, RF_ShutdownList_t ** listp);
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void *
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rf_ScanCreate(RF_SectorCount_t sect_per_disk,
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RF_AllocListElem_t * cl_list, RF_ShutdownList_t ** listp);
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void *
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rf_CscanCreate(RF_SectorCount_t sect_per_disk,
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RF_AllocListElem_t * cl_list, RF_ShutdownList_t ** listp);
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void rf_SstfEnqueue(void *qptr, RF_DiskQueueData_t * req, int priority);
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RF_DiskQueueData_t *rf_SstfDequeue(void *qptr);
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RF_DiskQueueData_t *rf_SstfPeek(void *qptr);
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int
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rf_SstfPromote(void *qptr, RF_StripeNum_t parityStripeID,
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RF_ReconUnitNum_t which_ru);
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RF_DiskQueueData_t *rf_ScanDequeue(void *qptr);
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RF_DiskQueueData_t *rf_ScanPeek(void *qptr);
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RF_DiskQueueData_t *rf_CscanDequeue(void *qptr);
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RF_DiskQueueData_t *rf_CscanPeek(void *qptr);
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#endif /* !_RF__RF_SSTF_H_ */
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