1 /* $NetBSD: rf_interdecluster.c,v 1.9 2003/01/20 05:30:08 simonb Exp $ */
2 /*
3 * Copyright (c) 1995 Carnegie-Mellon University.
4 * All rights reserved.
5 *
6 * Author: Khalil Amiri
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_interdecluster.c -- implements interleaved declustering
32 *
33 ************************************************************/
34
35 #include <sys/cdefs.h>
36 __KERNEL_RCSID(0, "$NetBSD: rf_interdecluster.c,v 1.9 2003/01/20 05:30:08 simonb Exp $");
37
38 #include "rf_archs.h"
39
40 #if RF_INCLUDE_INTERDECLUSTER > 0
41
42 #include <dev/raidframe/raidframevar.h>
43
44 #include "rf_raid.h"
45 #include "rf_interdecluster.h"
46 #include "rf_dag.h"
47 #include "rf_dagutils.h"
48 #include "rf_dagfuncs.h"
49 #include "rf_general.h"
50 #include "rf_utils.h"
51 #include "rf_dagffrd.h"
52 #include "rf_dagdegrd.h"
53 #include "rf_dagffwr.h"
54 #include "rf_dagdegwr.h"
55
56 typedef struct RF_InterdeclusterConfigInfo_s {
57 RF_RowCol_t **stripeIdentifier; /* filled in at config time and used
58 * by IdentifyStripe */
59 RF_StripeCount_t numSparingRegions;
60 RF_StripeCount_t stripeUnitsPerSparingRegion;
61 RF_SectorNum_t mirrorStripeOffset;
62 } RF_InterdeclusterConfigInfo_t;
63
64 int
65 rf_ConfigureInterDecluster(
66 RF_ShutdownList_t ** listp,
67 RF_Raid_t * raidPtr,
68 RF_Config_t * cfgPtr)
69 {
70 RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
71 RF_StripeCount_t num_used_stripeUnitsPerDisk;
72 RF_InterdeclusterConfigInfo_t *info;
73 RF_RowCol_t i, tmp, SUs_per_region;
74
75 /* create an Interleaved Declustering configuration structure */
76 RF_MallocAndAdd(info, sizeof(RF_InterdeclusterConfigInfo_t), (RF_InterdeclusterConfigInfo_t *),
77 raidPtr->cleanupList);
78 if (info == NULL)
79 return (ENOMEM);
80 layoutPtr->layoutSpecificInfo = (void *) info;
81
82 /* fill in the config structure. */
83 SUs_per_region = raidPtr->numCol * (raidPtr->numCol - 1);
84 info->stripeIdentifier = rf_make_2d_array(SUs_per_region, 2, raidPtr->cleanupList);
85 if (info->stripeIdentifier == NULL)
86 return (ENOMEM);
87 for (i = 0; i < SUs_per_region; i++) {
88 info->stripeIdentifier[i][0] = i / (raidPtr->numCol - 1);
89 tmp = i / raidPtr->numCol;
90 info->stripeIdentifier[i][1] = (i + 1 + tmp) % raidPtr->numCol;
91 }
92
93 /* no spare tables */
94 RF_ASSERT(raidPtr->numRow == 1);
95
96 /* fill in the remaining layout parameters */
97
98 /* total number of stripes should a multiple of 2*numCol: Each sparing
99 * region consists of 2*numCol stripes: n-1 primary copy, n-1
100 * secondary copy and 2 for spare .. */
101 num_used_stripeUnitsPerDisk = layoutPtr->stripeUnitsPerDisk - (layoutPtr->stripeUnitsPerDisk %
102 (2 * raidPtr->numCol));
103 info->numSparingRegions = num_used_stripeUnitsPerDisk / (2 * raidPtr->numCol);
104 /* this is in fact the number of stripe units (that are primary data
105 * copies) in the sparing region */
106 info->stripeUnitsPerSparingRegion = raidPtr->numCol * (raidPtr->numCol - 1);
107 info->mirrorStripeOffset = info->numSparingRegions * (raidPtr->numCol + 1);
108 layoutPtr->numStripe = info->numSparingRegions * info->stripeUnitsPerSparingRegion;
109 layoutPtr->numDataCol = 1;
110 layoutPtr->dataSectorsPerStripe = layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit;
111 layoutPtr->numParityCol = 1;
112
113 layoutPtr->dataStripeUnitsPerDisk = num_used_stripeUnitsPerDisk;
114
115 raidPtr->sectorsPerDisk =
116 num_used_stripeUnitsPerDisk * layoutPtr->sectorsPerStripeUnit;
117
118 raidPtr->totalSectors =
119 (layoutPtr->numStripe) * layoutPtr->sectorsPerStripeUnit;
120
121 layoutPtr->stripeUnitsPerDisk = raidPtr->sectorsPerDisk / layoutPtr->sectorsPerStripeUnit;
122
123 return (0);
124 }
125
126 int
127 rf_GetDefaultNumFloatingReconBuffersInterDecluster(RF_Raid_t * raidPtr)
128 {
129 return (30);
130 }
131
132 RF_HeadSepLimit_t
133 rf_GetDefaultHeadSepLimitInterDecluster(RF_Raid_t * raidPtr)
134 {
135 return (raidPtr->sectorsPerDisk);
136 }
137
138 RF_ReconUnitCount_t
139 rf_GetNumSpareRUsInterDecluster(
140 RF_Raid_t * raidPtr)
141 {
142 RF_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
143
144 return (2 * ((RF_ReconUnitCount_t) info->numSparingRegions));
145 /* the layout uses two stripe units per disk as spare within each
146 * sparing region */
147 }
148 /* Maps to the primary copy of the data, i.e. the first mirror pair */
149 void
150 rf_MapSectorInterDecluster(
151 RF_Raid_t * raidPtr,
152 RF_RaidAddr_t raidSector,
153 RF_RowCol_t * row,
154 RF_RowCol_t * col,
155 RF_SectorNum_t * diskSector,
156 int remap)
157 {
158 RF_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
159 RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
160 RF_StripeNum_t su_offset_into_disk, mirror_su_offset_into_disk;
161 RF_StripeNum_t sparing_region_id, index_within_region;
162 int col_before_remap;
163
164 *row = 0;
165 sparing_region_id = SUID / info->stripeUnitsPerSparingRegion;
166 index_within_region = SUID % info->stripeUnitsPerSparingRegion;
167 su_offset_into_disk = index_within_region % (raidPtr->numCol - 1);
168 mirror_su_offset_into_disk = index_within_region / raidPtr->numCol;
169 col_before_remap = index_within_region / (raidPtr->numCol - 1);
170
171 if (!remap) {
172 *col = col_before_remap;
173 *diskSector = (su_offset_into_disk + ((raidPtr->numCol - 1) * sparing_region_id)) *
174 raidPtr->Layout.sectorsPerStripeUnit;
175 *diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
176 } else {
177 /* remap sector to spare space... */
178 *diskSector = sparing_region_id * (raidPtr->numCol + 1) * raidPtr->Layout.sectorsPerStripeUnit;
179 *diskSector += (raidPtr->numCol - 1) * raidPtr->Layout.sectorsPerStripeUnit;
180 *diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
181 *col = (index_within_region + 1 + mirror_su_offset_into_disk) % raidPtr->numCol;
182 *col = (*col + 1) % raidPtr->numCol;
183 if (*col == col_before_remap)
184 *col = (*col + 1) % raidPtr->numCol;
185 }
186 }
187 /* Maps to the second copy of the mirror pair. */
188 void
189 rf_MapParityInterDecluster(
190 RF_Raid_t * raidPtr,
191 RF_RaidAddr_t raidSector,
192 RF_RowCol_t * row,
193 RF_RowCol_t * col,
194 RF_SectorNum_t * diskSector,
195 int remap)
196 {
197 RF_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
198 RF_StripeNum_t sparing_region_id, index_within_region, mirror_su_offset_into_disk;
199 RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
200 int col_before_remap;
201
202 sparing_region_id = SUID / info->stripeUnitsPerSparingRegion;
203 index_within_region = SUID % info->stripeUnitsPerSparingRegion;
204 mirror_su_offset_into_disk = index_within_region / raidPtr->numCol;
205 col_before_remap = (index_within_region + 1 + mirror_su_offset_into_disk) % raidPtr->numCol;
206
207 *row = 0;
208 if (!remap) {
209 *col = col_before_remap;
210 *diskSector = info->mirrorStripeOffset * raidPtr->Layout.sectorsPerStripeUnit;
211 *diskSector += sparing_region_id * (raidPtr->numCol - 1) * raidPtr->Layout.sectorsPerStripeUnit;
212 *diskSector += mirror_su_offset_into_disk * raidPtr->Layout.sectorsPerStripeUnit;
213 *diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
214 } else {
215 /* remap parity to spare space ... */
216 *diskSector = sparing_region_id * (raidPtr->numCol + 1) * raidPtr->Layout.sectorsPerStripeUnit;
217 *diskSector += (raidPtr->numCol) * raidPtr->Layout.sectorsPerStripeUnit;
218 *diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
219 *col = index_within_region / (raidPtr->numCol - 1);
220 *col = (*col + 1) % raidPtr->numCol;
221 if (*col == col_before_remap)
222 *col = (*col + 1) % raidPtr->numCol;
223 }
224 }
225
226 void
227 rf_IdentifyStripeInterDecluster(
228 RF_Raid_t * raidPtr,
229 RF_RaidAddr_t addr,
230 RF_RowCol_t ** diskids,
231 RF_RowCol_t * outRow)
232 {
233 RF_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
234 RF_StripeNum_t SUID;
235
236 SUID = addr / raidPtr->Layout.sectorsPerStripeUnit;
237 SUID = SUID % info->stripeUnitsPerSparingRegion;
238
239 *outRow = 0;
240 *diskids = info->stripeIdentifier[SUID];
241 }
242
243 void
244 rf_MapSIDToPSIDInterDecluster(
245 RF_RaidLayout_t * layoutPtr,
246 RF_StripeNum_t stripeID,
247 RF_StripeNum_t * psID,
248 RF_ReconUnitNum_t * which_ru)
249 {
250 *which_ru = 0;
251 *psID = stripeID;
252 }
253 /******************************************************************************
254 * select a graph to perform a single-stripe access
255 *
256 * Parameters: raidPtr - description of the physical array
257 * type - type of operation (read or write) requested
258 * asmap - logical & physical addresses for this access
259 * createFunc - name of function to use to create the graph
260 *****************************************************************************/
261
262 void
263 rf_RAIDIDagSelect(
264 RF_Raid_t * raidPtr,
265 RF_IoType_t type,
266 RF_AccessStripeMap_t * asmap,
267 RF_VoidFuncPtr * createFunc)
268 {
269 RF_ASSERT(RF_IO_IS_R_OR_W(type));
270
271 if (asmap->numDataFailed + asmap->numParityFailed > 1) {
272 RF_ERRORMSG("Multiple disks failed in a single group! Aborting I/O operation.\n");
273 *createFunc = NULL;
274 return;
275 }
276 *createFunc = (type == RF_IO_TYPE_READ) ? (RF_VoidFuncPtr) rf_CreateFaultFreeReadDAG : (RF_VoidFuncPtr) rf_CreateRaidOneWriteDAG;
277 if (type == RF_IO_TYPE_READ) {
278 if (asmap->numDataFailed == 0)
279 *createFunc = (RF_VoidFuncPtr) rf_CreateMirrorPartitionReadDAG;
280 else
281 *createFunc = (RF_VoidFuncPtr) rf_CreateRaidOneDegradedReadDAG;
282 } else
283 *createFunc = (RF_VoidFuncPtr) rf_CreateRaidOneWriteDAG;
284 }
285 #endif /* RF_INCLUDE_INTERDECLUSTER > 0 */
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