1 /* $NetBSD: rf_raid0.c,v 1.16 2019/02/09 03:34:00 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 1.16 2019/02/09 03:34:00 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
50 typedef struct RF_Raid0ConfigInfo_s {
51 RF_RowCol_t *stripeIdentifier;
52 } RF_Raid0ConfigInfo_t;
53
54 int
rf_ConfigureRAID0(RF_ShutdownList_t ** listp,RF_Raid_t * raidPtr,RF_Config_t * cfgPtr)55 rf_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 info = RF_MallocAndAdd(sizeof(*info), raidPtr->cleanupList);
64 if (info == NULL)
65 return (ENOMEM);
66 layoutPtr->layoutSpecificInfo = (void *) info;
67
68 info->stripeIdentifier = RF_MallocAndAdd(raidPtr->numCol
69 * sizeof(*info->stripeIdentifier), 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 raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk * raidPtr->numCol * layoutPtr->sectorsPerStripeUnit;
76 layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk;
77 layoutPtr->dataSectorsPerStripe = raidPtr->numCol * layoutPtr->sectorsPerStripeUnit;
78 layoutPtr->numDataCol = raidPtr->numCol;
79 layoutPtr->numParityCol = 0;
80 return (0);
81 }
82
83 void
rf_MapSectorRAID0(RF_Raid_t * raidPtr,RF_RaidAddr_t raidSector,RF_RowCol_t * col,RF_SectorNum_t * diskSector,int remap)84 rf_MapSectorRAID0(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
85 RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap)
86 {
87 RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
88 *col = SUID % raidPtr->numCol;
89 *diskSector = (SUID / raidPtr->numCol) * raidPtr->Layout.sectorsPerStripeUnit +
90 (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
91 }
92
93 void
rf_MapParityRAID0(RF_Raid_t * raidPtr,RF_RaidAddr_t raidSector,RF_RowCol_t * col,RF_SectorNum_t * diskSector,int remap)94 rf_MapParityRAID0(RF_Raid_t *raidPtr,
95 RF_RaidAddr_t raidSector, RF_RowCol_t *col,
96 RF_SectorNum_t *diskSector, int remap)
97 {
98 *col = 0;
99 *diskSector = 0;
100 }
101
102 void
rf_IdentifyStripeRAID0(RF_Raid_t * raidPtr,RF_RaidAddr_t addr,RF_RowCol_t ** diskids)103 rf_IdentifyStripeRAID0(RF_Raid_t *raidPtr, RF_RaidAddr_t addr,
104 RF_RowCol_t **diskids)
105 {
106 RF_Raid0ConfigInfo_t *info;
107
108 info = raidPtr->Layout.layoutSpecificInfo;
109 *diskids = info->stripeIdentifier;
110 }
111
112 void
rf_MapSIDToPSIDRAID0(RF_RaidLayout_t * layoutPtr,RF_StripeNum_t stripeID,RF_StripeNum_t * psID,RF_ReconUnitNum_t * which_ru)113 rf_MapSIDToPSIDRAID0(RF_RaidLayout_t *layoutPtr,
114 RF_StripeNum_t stripeID, RF_StripeNum_t *psID, RF_ReconUnitNum_t *which_ru)
115 {
116 *which_ru = 0;
117 *psID = stripeID;
118 }
119
120 void
rf_RAID0DagSelect(RF_Raid_t * raidPtr,RF_IoType_t type,RF_AccessStripeMap_t * asmap,RF_VoidFuncPtr * createFunc)121 rf_RAID0DagSelect(
122 RF_Raid_t * raidPtr,
123 RF_IoType_t type,
124 RF_AccessStripeMap_t * asmap,
125 RF_VoidFuncPtr * createFunc)
126 {
127 if (raidPtr->numFailures > 0) {
128 *createFunc = NULL;
129 return;
130 }
131 *createFunc = ((type == RF_IO_TYPE_READ) ?
132 (RF_VoidFuncPtr) rf_CreateFaultFreeReadDAG : (RF_VoidFuncPtr) rf_CreateRAID0WriteDAG);
133 }
134
135 int
rf_VerifyParityRAID0(RF_Raid_t * raidPtr,RF_RaidAddr_t raidAddr,RF_PhysDiskAddr_t * parityPDA,int correct_it,RF_RaidAccessFlags_t flags)136 rf_VerifyParityRAID0(RF_Raid_t *raidPtr,
137 RF_RaidAddr_t raidAddr, RF_PhysDiskAddr_t *parityPDA,
138 int correct_it, RF_RaidAccessFlags_t flags)
139 {
140 /*
141 * No parity is always okay.
142 */
143 return (RF_PARITY_OKAY);
144 }
145