1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/* $OpenBSD: rf_raid0.c,v 1.4 2002/12/16 07:01:04 tdeval Exp $ */
/* $NetBSD: rf_raid0.c,v 1.4 2000/01/07 03:41:02 oster Exp $ */
/*
* Copyright (c) 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Mark Holland
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
/*****************************************
*
* rf_raid0.c -- Implements RAID Level 0.
*
*****************************************/
#include "rf_types.h"
#include "rf_raid.h"
#include "rf_raid0.h"
#include "rf_dag.h"
#include "rf_dagffrd.h"
#include "rf_dagffwr.h"
#include "rf_dagutils.h"
#include "rf_dagfuncs.h"
#include "rf_general.h"
#include "rf_configure.h"
#include "rf_parityscan.h"
typedef struct RF_Raid0ConfigInfo_s {
RF_RowCol_t *stripeIdentifier;
} RF_Raid0ConfigInfo_t;
int
rf_ConfigureRAID0(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr,
RF_Config_t *cfgPtr)
{
RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
RF_Raid0ConfigInfo_t *info;
RF_RowCol_t i;
/* Create a RAID level 0 configuration structure. */
RF_MallocAndAdd(info, sizeof(RF_Raid0ConfigInfo_t),
(RF_Raid0ConfigInfo_t *), raidPtr->cleanupList);
if (info == NULL)
return (ENOMEM);
layoutPtr->layoutSpecificInfo = (void *) info;
RF_MallocAndAdd(info->stripeIdentifier, raidPtr->numCol *
sizeof(RF_RowCol_t), (RF_RowCol_t *), raidPtr->cleanupList);
if (info->stripeIdentifier == NULL)
return (ENOMEM);
for (i = 0; i < raidPtr->numCol; i++)
info->stripeIdentifier[i] = i;
RF_ASSERT(raidPtr->numRow == 1);
raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk *
raidPtr->numCol * layoutPtr->sectorsPerStripeUnit;
layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk;
layoutPtr->dataSectorsPerStripe = raidPtr->numCol *
layoutPtr->sectorsPerStripeUnit;
layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit <<
raidPtr->logBytesPerSector;
layoutPtr->numDataCol = raidPtr->numCol;
layoutPtr->numParityCol = 0;
return (0);
}
void
rf_MapSectorRAID0(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
RF_RowCol_t *row, RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap)
{
RF_StripeNum_t SUID =
raidSector / raidPtr->Layout.sectorsPerStripeUnit;
*row = 0;
*col = SUID % raidPtr->numCol;
*diskSector = (SUID / raidPtr->numCol) *
raidPtr->Layout.sectorsPerStripeUnit +
(raidSector % raidPtr->Layout.sectorsPerStripeUnit);
}
void
rf_MapParityRAID0(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
RF_RowCol_t *row, RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap)
{
*row = *col = 0;
*diskSector = 0;
}
void
rf_IdentifyStripeRAID0( RF_Raid_t *raidPtr, RF_RaidAddr_t addr,
RF_RowCol_t **diskids, RF_RowCol_t *outRow)
{
RF_Raid0ConfigInfo_t *info;
info = raidPtr->Layout.layoutSpecificInfo;
*diskids = info->stripeIdentifier;
*outRow = 0;
}
void
rf_MapSIDToPSIDRAID0(RF_RaidLayout_t *layoutPtr, RF_StripeNum_t stripeID,
RF_StripeNum_t *psID, RF_ReconUnitNum_t *which_ru)
{
*which_ru = 0;
*psID = stripeID;
}
void
rf_RAID0DagSelect(RF_Raid_t *raidPtr, RF_IoType_t type,
RF_AccessStripeMap_t *asmap, RF_VoidFuncPtr *createFunc)
{
*createFunc = ((type == RF_IO_TYPE_READ) ?
(RF_VoidFuncPtr) rf_CreateFaultFreeReadDAG :
(RF_VoidFuncPtr) rf_CreateRAID0WriteDAG);
}
int
rf_VerifyParityRAID0(RF_Raid_t *raidPtr, RF_RaidAddr_t raidAddr,
RF_PhysDiskAddr_t *parityPDA, int correct_it, RF_RaidAccessFlags_t flags)
{
/*
* No parity is always okay.
*/
return (RF_PARITY_OKAY);
}
|
