1 | /* $NetBSD: rf_sstf.h,v 1.5 2005/12/11 12:23:37 christos 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 | |