1/* $NetBSD: rf_raid0.c,v 1.15 2006/11/16 01:33:23 christos Exp $ */
2/*
3 * Copyright (c) 1995 Carnegie-Mellon University.
4 * All rights reserved.
5 *
6 * Author: Mark Holland
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/***************************************
30 *
31 * rf_raid0.c -- implements RAID Level 0
32 *
33 ***************************************/
34
35#include <sys/cdefs.h>
36__KERNEL_RCSID(0, "$NetBSD: rf_raid0.c,v 1.15 2006/11/16 01:33:23 christos Exp $");
37
38#include <dev/raidframe/raidframevar.h>
39
40#include "rf_raid.h"
41#include "rf_raid0.h"
42#include "rf_dag.h"
43#include "rf_dagffrd.h"
44#include "rf_dagffwr.h"
45#include "rf_dagutils.h"
46#include "rf_dagfuncs.h"
47#include "rf_general.h"
48#include "rf_parityscan.h"
49
50typedef struct RF_Raid0ConfigInfo_s {
51 RF_RowCol_t *stripeIdentifier;
52} RF_Raid0ConfigInfo_t;
53
54int
55rf_ConfigureRAID0(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr,
56 RF_Config_t *cfgPtr)
57{
58 RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
59 RF_Raid0ConfigInfo_t *info;
60 RF_RowCol_t i;
61
62 /* create a RAID level 0 configuration structure */
63 RF_MallocAndAdd(info, sizeof(RF_Raid0ConfigInfo_t), (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 * sizeof(RF_RowCol_t), (RF_RowCol_t *), raidPtr->cleanupList);
69 if (info->stripeIdentifier == NULL)
70 return (ENOMEM);
71 for (i = 0; i < raidPtr->numCol; i++)
72 info->stripeIdentifier[i] = i;
73
74 raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk * raidPtr->numCol * layoutPtr->sectorsPerStripeUnit;
75 layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk;
76 layoutPtr->dataSectorsPerStripe = raidPtr->numCol * layoutPtr->sectorsPerStripeUnit;
77 layoutPtr->numDataCol = raidPtr->numCol;
78 layoutPtr->numParityCol = 0;
79 return (0);
80}
81
82void
83rf_MapSectorRAID0(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
84 RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap)
85{
86 RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
87 *col = SUID % raidPtr->numCol;
88 *diskSector = (SUID / raidPtr->numCol) * raidPtr->Layout.sectorsPerStripeUnit +
89 (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
90}
91
92void
93rf_MapParityRAID0(RF_Raid_t *raidPtr,
94 RF_RaidAddr_t raidSector, RF_RowCol_t *col,
95 RF_SectorNum_t *diskSector, int remap)
96{
97 *col = 0;
98 *diskSector = 0;
99}
100
101void
102rf_IdentifyStripeRAID0(RF_Raid_t *raidPtr, RF_RaidAddr_t addr,
103 RF_RowCol_t **diskids)
104{
105 RF_Raid0ConfigInfo_t *info;
106
107 info = raidPtr->Layout.layoutSpecificInfo;
108 *diskids = info->stripeIdentifier;
109}
110
111void
112rf_MapSIDToPSIDRAID0(RF_RaidLayout_t *layoutPtr,
113 RF_StripeNum_t stripeID, RF_StripeNum_t *psID, RF_ReconUnitNum_t *which_ru)
114{
115 *which_ru = 0;
116 *psID = stripeID;
117}
118
119void
120rf_RAID0DagSelect(
121 RF_Raid_t * raidPtr,
122 RF_IoType_t type,
123 RF_AccessStripeMap_t * asmap,
124 RF_VoidFuncPtr * createFunc)
125{
126 if (raidPtr->numFailures > 0) {
127 *createFunc = NULL;
128 return;
129 }
130 *createFunc = ((type == RF_IO_TYPE_READ) ?
131 (RF_VoidFuncPtr) rf_CreateFaultFreeReadDAG : (RF_VoidFuncPtr) rf_CreateRAID0WriteDAG);
132}
133
134int
135rf_VerifyParityRAID0(RF_Raid_t *raidPtr,
136 RF_RaidAddr_t raidAddr, RF_PhysDiskAddr_t *parityPDA,
137 int correct_it, RF_RaidAccessFlags_t flags)
138{
139 /*
140 * No parity is always okay.
141 */
142 return (RF_PARITY_OKAY);
143}
144