1 /* $OpenBSD: rf_raid0.c,v 1.4 2002/12/16 07:01:04 tdeval Exp $ */
2 /* $NetBSD: rf_raid0.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: Mark Holland
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_raid0.c -- Implements RAID Level 0.
34 *
35 *****************************************/
36
37 #include "rf_types.h"
38 #include "rf_raid.h"
39 #include "rf_raid0.h"
40 #include "rf_dag.h"
41 #include "rf_dagffrd.h"
42 #include "rf_dagffwr.h"
43 #include "rf_dagutils.h"
44 #include "rf_dagfuncs.h"
45 #include "rf_general.h"
46 #include "rf_configure.h"
47 #include "rf_parityscan.h"
48
49 typedef struct RF_Raid0ConfigInfo_s {
50 RF_RowCol_t *stripeIdentifier;
51 } RF_Raid0ConfigInfo_t;
52
53 int
rf_ConfigureRAID0(RF_ShutdownList_t ** listp,RF_Raid_t * raidPtr,RF_Config_t * cfgPtr)54 rf_ConfigureRAID0(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr,
55 RF_Config_t *cfgPtr)
56 {
57 RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
58 RF_Raid0ConfigInfo_t *info;
59 RF_RowCol_t i;
60
61 /* Create a RAID level 0 configuration structure. */
62 RF_MallocAndAdd(info, sizeof(RF_Raid0ConfigInfo_t),
63 (RF_Raid0ConfigInfo_t *), raidPtr->cleanupList);
64 if (info == NULL)
65 return (ENOMEM);
66 layoutPtr->layoutSpecificInfo = (void *) info;
67
68 RF_MallocAndAdd(info->stripeIdentifier, raidPtr->numCol *
69 sizeof(RF_RowCol_t), (RF_RowCol_t *), raidPtr->cleanupList);
70 if (info->stripeIdentifier == NULL)
71 return (ENOMEM);
72 for (i = 0; i < raidPtr->numCol; i++)
73 info->stripeIdentifier[i] = i;
74
75 RF_ASSERT(raidPtr->numRow == 1);
76 raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk *
77 raidPtr->numCol * layoutPtr->sectorsPerStripeUnit;
78 layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk;
79 layoutPtr->dataSectorsPerStripe = raidPtr->numCol *
80 layoutPtr->sectorsPerStripeUnit;
81 layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit <<
82 raidPtr->logBytesPerSector;
83 layoutPtr->numDataCol = raidPtr->numCol;
84 layoutPtr->numParityCol = 0;
85 return (0);
86 }
87
88 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)89 rf_MapSectorRAID0(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
90 RF_RowCol_t *row, RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap)
91 {
92 RF_StripeNum_t SUID =
93 raidSector / raidPtr->Layout.sectorsPerStripeUnit;
94 *row = 0;
95 *col = SUID % raidPtr->numCol;
96 *diskSector = (SUID / raidPtr->numCol) *
97 raidPtr->Layout.sectorsPerStripeUnit +
98 (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
99 }
100
101 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)102 rf_MapParityRAID0(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
103 RF_RowCol_t *row, RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap)
104 {
105 *row = *col = 0;
106 *diskSector = 0;
107 }
108
109 void
rf_IdentifyStripeRAID0(RF_Raid_t * raidPtr,RF_RaidAddr_t addr,RF_RowCol_t ** diskids,RF_RowCol_t * outRow)110 rf_IdentifyStripeRAID0( RF_Raid_t *raidPtr, RF_RaidAddr_t addr,
111 RF_RowCol_t **diskids, RF_RowCol_t *outRow)
112 {
113 RF_Raid0ConfigInfo_t *info;
114
115 info = raidPtr->Layout.layoutSpecificInfo;
116 *diskids = info->stripeIdentifier;
117 *outRow = 0;
118 }
119
120 void
rf_MapSIDToPSIDRAID0(RF_RaidLayout_t * layoutPtr,RF_StripeNum_t stripeID,RF_StripeNum_t * psID,RF_ReconUnitNum_t * which_ru)121 rf_MapSIDToPSIDRAID0(RF_RaidLayout_t *layoutPtr, RF_StripeNum_t stripeID,
122 RF_StripeNum_t *psID, RF_ReconUnitNum_t *which_ru)
123 {
124 *which_ru = 0;
125 *psID = stripeID;
126 }
127
128 void
rf_RAID0DagSelect(RF_Raid_t * raidPtr,RF_IoType_t type,RF_AccessStripeMap_t * asmap,RF_VoidFuncPtr * createFunc)129 rf_RAID0DagSelect(RF_Raid_t *raidPtr, RF_IoType_t type,
130 RF_AccessStripeMap_t *asmap, RF_VoidFuncPtr *createFunc)
131 {
132 *createFunc = ((type == RF_IO_TYPE_READ) ?
133 (RF_VoidFuncPtr) rf_CreateFaultFreeReadDAG :
134 (RF_VoidFuncPtr) rf_CreateRAID0WriteDAG);
135 }
136
137 int
rf_VerifyParityRAID0(RF_Raid_t * raidPtr,RF_RaidAddr_t raidAddr,RF_PhysDiskAddr_t * parityPDA,int correct_it,RF_RaidAccessFlags_t flags)138 rf_VerifyParityRAID0(RF_Raid_t *raidPtr, RF_RaidAddr_t raidAddr,
139 RF_PhysDiskAddr_t *parityPDA, int correct_it, RF_RaidAccessFlags_t flags)
140 {
141 /*
142 * No parity is always okay.
143 */
144 return (RF_PARITY_OKAY);
145 }
146