1 /* $NetBSD: rf_sstf.h,v 1.3 1999/02/05 00:06:17 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 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 RF_DiskQueueData_t *rf_SstfPeek(void *qptr); 61 int 62 rf_SstfPromote(void *qptr, RF_StripeNum_t parityStripeID, 63 RF_ReconUnitNum_t which_ru); 64 RF_DiskQueueData_t *rf_ScanDequeue(void *qptr); 65 RF_DiskQueueData_t *rf_ScanPeek(void *qptr); 66 RF_DiskQueueData_t *rf_CscanDequeue(void *qptr); 67 RF_DiskQueueData_t *rf_CscanPeek(void *qptr); 68 69 #endif /* !_RF__RF_SSTF_H_ */ 70