1 /* $OpenBSD: rf_raid4.c,v 1.4 2002/12/16 07:01:04 tdeval Exp $ */
2 /* $NetBSD: rf_raid4.c,v 1.4 2000/01/07 03:41:02 oster Exp $ */
3
4 /*
5 * Copyright (c) 1995 Carnegie-Mellon University.
6 * All rights reserved.
7 *
8 * Author: Rachad Youssef
9 *
10 * Permission to use, copy, modify and distribute this software and
11 * its documentation is hereby granted, provided that both the copyright
12 * notice and this permission notice appear in all copies of the
13 * software, derivative works or modified versions, and any portions
14 * thereof, and that both notices appear in supporting documentation.
15 *
16 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
17 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
18 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
19 *
20 * Carnegie Mellon requests users of this software to return to
21 *
22 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
23 * School of Computer Science
24 * Carnegie Mellon University
25 * Pittsburgh PA 15213-3890
26 *
27 * any improvements or extensions that they make and grant Carnegie the
28 * rights to redistribute these changes.
29 */
30
31 /*****************************************
32 *
33 * rf_raid4.c -- Implements RAID Level 4.
34 *
35 *****************************************/
36
37 #include "rf_raid.h"
38 #include "rf_dag.h"
39 #include "rf_dagutils.h"
40 #include "rf_dagfuncs.h"
41 #include "rf_dagffrd.h"
42 #include "rf_dagffwr.h"
43 #include "rf_dagdegrd.h"
44 #include "rf_dagdegwr.h"
45 #include "rf_raid4.h"
46 #include "rf_general.h"
47
48 typedef struct RF_Raid4ConfigInfo_s {
49 RF_RowCol_t *stripeIdentifier; /*
50 * Filled in at config time & used by
51 * IdentifyStripe.
52 */
53 } RF_Raid4ConfigInfo_t;
54
55
56 int
rf_ConfigureRAID4(RF_ShutdownList_t ** listp,RF_Raid_t * raidPtr,RF_Config_t * cfgPtr)57 rf_ConfigureRAID4(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr,
58 RF_Config_t *cfgPtr)
59 {
60 RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
61 RF_Raid4ConfigInfo_t *info;
62 int i;
63
64 /* Create a RAID level 4 configuration structure... */
65 RF_MallocAndAdd(info, sizeof(RF_Raid4ConfigInfo_t),
66 (RF_Raid4ConfigInfo_t *), raidPtr->cleanupList);
67 if (info == NULL)
68 return (ENOMEM);
69 layoutPtr->layoutSpecificInfo = (void *) info;
70
71 /* ... and fill it in. */
72 RF_MallocAndAdd(info->stripeIdentifier, raidPtr->numCol *
73 sizeof(RF_RowCol_t), (RF_RowCol_t *), raidPtr->cleanupList);
74 if (info->stripeIdentifier == NULL)
75 return (ENOMEM);
76 for (i = 0; i < raidPtr->numCol; i++)
77 info->stripeIdentifier[i] = i;
78
79 RF_ASSERT(raidPtr->numRow == 1);
80
81 /* Fill in the remaining layout parameters. */
82 layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk;
83 layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit <<
84 raidPtr->logBytesPerSector;
85 layoutPtr->numDataCol = raidPtr->numCol - 1;
86 layoutPtr->dataSectorsPerStripe = layoutPtr->numDataCol *
87 layoutPtr->sectorsPerStripeUnit;
88 layoutPtr->numParityCol = 1;
89 raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk *
90 layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit;
91
92 return (0);
93 }
94
95 int
rf_GetDefaultNumFloatingReconBuffersRAID4(RF_Raid_t * raidPtr)96 rf_GetDefaultNumFloatingReconBuffersRAID4(RF_Raid_t *raidPtr)
97 {
98 return (20);
99 }
100
101 RF_HeadSepLimit_t
rf_GetDefaultHeadSepLimitRAID4(RF_Raid_t * raidPtr)102 rf_GetDefaultHeadSepLimitRAID4(RF_Raid_t *raidPtr)
103 {
104 return (20);
105 }
106
107 void
rf_MapSectorRAID4(RF_Raid_t * raidPtr,RF_RaidAddr_t raidSector,RF_RowCol_t * row,RF_RowCol_t * col,RF_SectorNum_t * diskSector,int remap)108 rf_MapSectorRAID4(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
109 RF_RowCol_t *row, RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap)
110 {
111 RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
112 *row = 0;
113 *col = SUID % raidPtr->Layout.numDataCol;
114 *diskSector = (SUID / (raidPtr->Layout.numDataCol)) *
115 raidPtr->Layout.sectorsPerStripeUnit +
116 (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
117 }
118
119 void
rf_MapParityRAID4(RF_Raid_t * raidPtr,RF_RaidAddr_t raidSector,RF_RowCol_t * row,RF_RowCol_t * col,RF_SectorNum_t * diskSector,int remap)120 rf_MapParityRAID4(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
121 RF_RowCol_t *row, RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap)
122 {
123 RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
124
125 *row = 0;
126 *col = raidPtr->Layout.numDataCol;
127 *diskSector = (SUID / (raidPtr->Layout.numDataCol)) *
128 raidPtr->Layout.sectorsPerStripeUnit +
129 (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
130 }
131
132 void
rf_IdentifyStripeRAID4(RF_Raid_t * raidPtr,RF_RaidAddr_t addr,RF_RowCol_t ** diskids,RF_RowCol_t * outRow)133 rf_IdentifyStripeRAID4(RF_Raid_t *raidPtr, RF_RaidAddr_t addr,
134 RF_RowCol_t **diskids, RF_RowCol_t *outRow)
135 {
136 RF_Raid4ConfigInfo_t *info = raidPtr->Layout.layoutSpecificInfo;
137
138 *outRow = 0;
139 *diskids = info->stripeIdentifier;
140 }
141
142 void
rf_MapSIDToPSIDRAID4(RF_RaidLayout_t * layoutPtr,RF_StripeNum_t stripeID,RF_StripeNum_t * psID,RF_ReconUnitNum_t * which_ru)143 rf_MapSIDToPSIDRAID4(RF_RaidLayout_t *layoutPtr, RF_StripeNum_t stripeID,
144 RF_StripeNum_t *psID, RF_ReconUnitNum_t *which_ru)
145 {
146 *which_ru = 0;
147 *psID = stripeID;
148 }
149