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 | |
50 | typedef struct RF_Raid0ConfigInfo_s { |
51 | RF_RowCol_t *stripeIdentifier; |
52 | } RF_Raid0ConfigInfo_t; |
53 | |
54 | int |
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 | 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 | |
82 | void |
83 | rf_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 | |
92 | void |
93 | rf_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 | |
101 | void |
102 | rf_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 | |
111 | void |
112 | rf_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 | |
119 | void |
120 | rf_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 | |
134 | int |
135 | rf_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 | |