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@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 34typedef struct RF_SstfQ_s { 35 RF_DiskQueueData_t *queue; 36 RF_DiskQueueData_t *qtail; 37 int qlen; 38} RF_SstfQ_t; 39 40typedef 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 49void * 50rf_SstfCreate(RF_SectorCount_t sect_per_disk, 51 RF_AllocListElem_t * cl_list, RF_ShutdownList_t ** listp); 52void * 53rf_ScanCreate(RF_SectorCount_t sect_per_disk, 54 RF_AllocListElem_t * cl_list, RF_ShutdownList_t ** listp); 55void * 56rf_CscanCreate(RF_SectorCount_t sect_per_disk, 57 RF_AllocListElem_t * cl_list, RF_ShutdownList_t ** listp); 58void rf_SstfEnqueue(void *qptr, RF_DiskQueueData_t * req, int priority); 59RF_DiskQueueData_t *rf_SstfDequeue(void *qptr); 60int 61rf_SstfPromote(void *qptr, RF_StripeNum_t parityStripeID, 62 RF_ReconUnitNum_t which_ru); 63RF_DiskQueueData_t *rf_ScanDequeue(void *qptr); 64RF_DiskQueueData_t *rf_CscanDequeue(void *qptr); 65 66#endif /* !_RF__RF_SSTF_H_ */ 67