1 /* $NetBSD: rf_declusterPQ.c,v 1.17 2019/02/09 03:34:00 christos Exp $ */ 2 /* 3 * Copyright (c) 1995 Carnegie-Mellon University. 4 * All rights reserved. 5 * 6 * Authors: Daniel Stodolsky, Mark Holland, Jim Zelenka 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 (at) 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 * rf_declusterPQ.c 31 * 32 * mapping code for declustered P & Q or declustered EvenOdd 33 * much code borrowed from rf_decluster.c 34 * 35 *--------------------------------------------------*/ 36 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: rf_declusterPQ.c,v 1.17 2019/02/09 03:34:00 christos Exp $"); 39 40 #include <dev/raidframe/raidframevar.h> 41 42 #include "rf_archs.h" 43 #include "rf_raid.h" 44 #include "rf_decluster.h" 45 #include "rf_declusterPQ.h" 46 #include "rf_debugMem.h" 47 #include "rf_utils.h" 48 #include "rf_alloclist.h" 49 #include "rf_general.h" 50 51 #if (RF_INCLUDE_PARITY_DECLUSTERING_PQ > 0) || (RF_INCLUDE_EVENODD > 0) 52 /* configuration code */ 53 54 int 55 rf_ConfigureDeclusteredPQ(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr, 56 RF_Config_t *cfgPtr) 57 { 58 RF_RaidLayout_t *layoutPtr = &(raidPtr->Layout); 59 int b, v, k, r; /* block design params */ 60 int i, j, l; 61 int *first_avail_slot; 62 int complete_FT_count, SUID; 63 RF_DeclusteredConfigInfo_t *info; 64 int numCompleteFullTablesPerDisk; 65 int PUsPerDisk, spareRegionDepthInPUs, numCompleteSpareRegionsPerDisk = 0, 66 extraPUsPerDisk; 67 int totSparePUsPerDisk; 68 int diskOffsetOfLastFullTableInSUs, SpareSpaceInSUs; 69 char *cfgBuf = (char *) (cfgPtr->layoutSpecific); 70 71 cfgBuf += RF_SPAREMAP_NAME_LEN; 72 73 b = *((int *) cfgBuf); 74 cfgBuf += sizeof(int); 75 v = *((int *) cfgBuf); 76 cfgBuf += sizeof(int); 77 k = *((int *) cfgBuf); 78 cfgBuf += sizeof(int); 79 r = *((int *) cfgBuf); 80 cfgBuf += sizeof(int); 81 cfgBuf += sizeof(int); 82 raidPtr->noRotate = *((int *) cfgBuf); 83 cfgBuf += sizeof(int); 84 85 if (k <= 2) { 86 printf("RAIDFRAME: k=%d, minimum value 2\n", k); 87 return (EINVAL); 88 } 89 /* 1. create layout specific structure */ 90 info = RF_MallocAndAdd(sizeof(*info), raidPtr->cleanupList); 91 if (info == NULL) 92 return (ENOMEM); 93 layoutPtr->layoutSpecificInfo = (void *) info; 94 95 /* the sparemaps are generated assuming that parity is rotated, so we 96 * issue a warning if both distributed sparing and no-rotate are on at 97 * the same time */ 98 if ((raidPtr->Layout.map->flags & RF_DISTRIBUTE_SPARE) && raidPtr->noRotate) { 99 RF_ERRORMSG("Warning: distributed sparing specified without parity rotation.\n"); 100 } 101 if (raidPtr->numCol != v) { 102 RF_ERRORMSG2("RAID: config error: table element count (%d) not equal to no. of cols (%d)\n", v, raidPtr->numCol); 103 return (EINVAL); 104 } 105 /* 3. set up the values used in devRaidMap */ 106 info->BlocksPerTable = b; 107 info->NumParityReps = info->groupSize = k; 108 info->PUsPerBlock = k - 2; /* PQ */ 109 info->SUsPerTable = b * info->PUsPerBlock * layoutPtr->SUsPerPU; /* b blks, k-1 SUs each */ 110 info->SUsPerFullTable = k * info->SUsPerTable; /* rot k times */ 111 info->SUsPerBlock = info->PUsPerBlock * layoutPtr->SUsPerPU; 112 info->TableDepthInPUs = (b * k) / v; 113 info->FullTableDepthInPUs = info->TableDepthInPUs * k; /* k repetitions */ 114 115 /* used only in distributed sparing case */ 116 info->FullTablesPerSpareRegion = (v - 1) / rf_gcd(r, v - 1); /* (v-1)/gcd fulltables */ 117 info->TablesPerSpareRegion = k * info->FullTablesPerSpareRegion; 118 info->SpareSpaceDepthPerRegionInSUs = (r * info->TablesPerSpareRegion / (v - 1)) * layoutPtr->SUsPerPU; 119 120 /* check to make sure the block design is sufficiently small */ 121 if ((raidPtr->Layout.map->flags & RF_DISTRIBUTE_SPARE)) { 122 if (info->FullTableDepthInPUs * layoutPtr->SUsPerPU + info->SpareSpaceDepthPerRegionInSUs > layoutPtr->stripeUnitsPerDisk) { 123 RF_ERRORMSG3("RAID: config error: Full Table depth (%d) + Spare Space (%d) larger than disk size (%d) (BD too big)\n", 124 (int) info->FullTableDepthInPUs, 125 (int) info->SpareSpaceDepthPerRegionInSUs, 126 (int) layoutPtr->stripeUnitsPerDisk); 127 return (EINVAL); 128 } 129 } else { 130 if (info->TableDepthInPUs * layoutPtr->SUsPerPU > layoutPtr->stripeUnitsPerDisk) { 131 RF_ERRORMSG2("RAID: config error: Table depth (%d) larger than disk size (%d) (BD too big)\n", 132 (int) (info->TableDepthInPUs * layoutPtr->SUsPerPU), 133 (int) layoutPtr->stripeUnitsPerDisk); 134 return (EINVAL); 135 } 136 } 137 138 139 /* compute the size of each disk, and the number of tables in the last 140 * fulltable (which need not be complete) */ 141 if ((raidPtr->Layout.map->flags & RF_DISTRIBUTE_SPARE)) { 142 143 PUsPerDisk = layoutPtr->stripeUnitsPerDisk / layoutPtr->SUsPerPU; 144 spareRegionDepthInPUs = (info->TablesPerSpareRegion * info->TableDepthInPUs + 145 (info->TablesPerSpareRegion * info->TableDepthInPUs) / (v - 1)); 146 info->SpareRegionDepthInSUs = spareRegionDepthInPUs * layoutPtr->SUsPerPU; 147 148 numCompleteSpareRegionsPerDisk = PUsPerDisk / spareRegionDepthInPUs; 149 info->NumCompleteSRs = numCompleteSpareRegionsPerDisk; 150 extraPUsPerDisk = PUsPerDisk % spareRegionDepthInPUs; 151 152 /* assume conservatively that we need the full amount of spare 153 * space in one region in order to provide spares for the 154 * partial spare region at the end of the array. We set "i" 155 * to the number of tables in the partial spare region. This 156 * may actually include some fulltables. */ 157 extraPUsPerDisk -= (info->SpareSpaceDepthPerRegionInSUs / layoutPtr->SUsPerPU); 158 if (extraPUsPerDisk <= 0) 159 i = 0; 160 else 161 i = extraPUsPerDisk / info->TableDepthInPUs; 162 163 complete_FT_count = /* raidPtr->numRow */ 1 * (numCompleteSpareRegionsPerDisk * (info->TablesPerSpareRegion / k) + i / k); 164 info->FullTableLimitSUID = complete_FT_count * info->SUsPerFullTable; 165 info->ExtraTablesPerDisk = i % k; 166 167 /* note that in the last spare region, the spare space is 168 * complete even though data/parity space is not */ 169 totSparePUsPerDisk = (numCompleteSpareRegionsPerDisk + 1) * (info->SpareSpaceDepthPerRegionInSUs / layoutPtr->SUsPerPU); 170 info->TotSparePUsPerDisk = totSparePUsPerDisk; 171 172 layoutPtr->stripeUnitsPerDisk = 173 ((complete_FT_count / /* raidPtr->numRow*/ 1) * info->FullTableDepthInPUs + /* data & parity space */ 174 info->ExtraTablesPerDisk * info->TableDepthInPUs + 175 totSparePUsPerDisk /* spare space */ 176 ) * layoutPtr->SUsPerPU; 177 layoutPtr->dataStripeUnitsPerDisk = 178 (complete_FT_count * info->FullTableDepthInPUs + info->ExtraTablesPerDisk * info->TableDepthInPUs) 179 * layoutPtr->SUsPerPU * (k - 1) / k; 180 181 } else { 182 /* non-dist spare case: force each disk to contain an 183 * integral number of tables */ 184 layoutPtr->stripeUnitsPerDisk /= (info->TableDepthInPUs * layoutPtr->SUsPerPU); 185 layoutPtr->stripeUnitsPerDisk *= (info->TableDepthInPUs * layoutPtr->SUsPerPU); 186 187 /* compute the number of tables in the last fulltable, which 188 * need not be complete */ 189 complete_FT_count = 190 ((layoutPtr->stripeUnitsPerDisk / layoutPtr->SUsPerPU) / info->FullTableDepthInPUs) * /* raidPtr->numRow */ 1; 191 192 info->FullTableLimitSUID = complete_FT_count * info->SUsPerFullTable; 193 info->ExtraTablesPerDisk = 194 ((layoutPtr->stripeUnitsPerDisk / layoutPtr->SUsPerPU) / info->TableDepthInPUs) % k; 195 } 196 197 raidPtr->sectorsPerDisk = layoutPtr->stripeUnitsPerDisk * layoutPtr->sectorsPerStripeUnit; 198 199 /* find the disk offset of the stripe unit where the last fulltable 200 * starts */ 201 numCompleteFullTablesPerDisk = complete_FT_count / /* raidPtr->numRow */ 1; 202 diskOffsetOfLastFullTableInSUs = numCompleteFullTablesPerDisk * info->FullTableDepthInPUs * layoutPtr->SUsPerPU; 203 if ((raidPtr->Layout.map->flags & RF_DISTRIBUTE_SPARE)) { 204 SpareSpaceInSUs = numCompleteSpareRegionsPerDisk * info->SpareSpaceDepthPerRegionInSUs; 205 diskOffsetOfLastFullTableInSUs += SpareSpaceInSUs; 206 info->DiskOffsetOfLastSpareSpaceChunkInSUs = 207 diskOffsetOfLastFullTableInSUs + info->ExtraTablesPerDisk * info->TableDepthInPUs * layoutPtr->SUsPerPU; 208 } 209 info->DiskOffsetOfLastFullTableInSUs = diskOffsetOfLastFullTableInSUs; 210 info->numCompleteFullTablesPerDisk = numCompleteFullTablesPerDisk; 211 212 /* 4. create and initialize the lookup tables */ 213 info->LayoutTable = rf_make_2d_array(b, k, raidPtr->cleanupList); 214 if (info->LayoutTable == NULL) 215 return (ENOMEM); 216 info->OffsetTable = rf_make_2d_array(b, k, raidPtr->cleanupList); 217 if (info->OffsetTable == NULL) 218 return (ENOMEM); 219 info->BlockTable = rf_make_2d_array(info->TableDepthInPUs * layoutPtr->SUsPerPU, raidPtr->numCol, raidPtr->cleanupList); 220 if (info->BlockTable == NULL) 221 return (ENOMEM); 222 223 first_avail_slot = (int *) rf_make_1d_array(v, NULL); 224 if (first_avail_slot == NULL) 225 return (ENOMEM); 226 227 for (i = 0; i < b; i++) 228 for (j = 0; j < k; j++) 229 info->LayoutTable[i][j] = *cfgBuf++; 230 231 /* initialize offset table */ 232 for (i = 0; i < b; i++) 233 for (j = 0; j < k; j++) { 234 info->OffsetTable[i][j] = first_avail_slot[info->LayoutTable[i][j]]; 235 first_avail_slot[info->LayoutTable[i][j]]++; 236 } 237 238 /* initialize block table */ 239 for (SUID = l = 0; l < layoutPtr->SUsPerPU; l++) { 240 for (i = 0; i < b; i++) { 241 for (j = 0; j < k; j++) { 242 info->BlockTable[(info->OffsetTable[i][j] * layoutPtr->SUsPerPU) + l] 243 [info->LayoutTable[i][j]] = SUID; 244 } 245 SUID++; 246 } 247 } 248 249 rf_free_1d_array(first_avail_slot, v); 250 251 /* 5. set up the remaining redundant-but-useful parameters */ 252 253 raidPtr->totalSectors = (k * complete_FT_count + /* raidPtr->numRow */ 1 * info->ExtraTablesPerDisk) * 254 info->SUsPerTable * layoutPtr->sectorsPerStripeUnit; 255 layoutPtr->numStripe = (raidPtr->totalSectors / layoutPtr->sectorsPerStripeUnit) / (k - 2); 256 257 /* strange evaluation order below to try and minimize overflow 258 * problems */ 259 260 layoutPtr->dataSectorsPerStripe = (k - 2) * layoutPtr->sectorsPerStripeUnit; 261 layoutPtr->numDataCol = k - 2; 262 layoutPtr->numParityCol = 2; 263 264 return (0); 265 } 266 267 int 268 rf_GetDefaultNumFloatingReconBuffersPQ(RF_Raid_t *raidPtr) 269 { 270 int def_decl; 271 272 def_decl = rf_GetDefaultNumFloatingReconBuffersDeclustered(raidPtr); 273 return (RF_MAX(3 * raidPtr->numCol, def_decl)); 274 } 275 276 void 277 rf_MapSectorDeclusteredPQ(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector, 278 RF_RowCol_t *col, 279 RF_SectorNum_t *diskSector, int remap) 280 { 281 RF_RaidLayout_t *layoutPtr = &(raidPtr->Layout); 282 RF_DeclusteredConfigInfo_t *info = (RF_DeclusteredConfigInfo_t *) layoutPtr->layoutSpecificInfo; 283 RF_StripeNum_t SUID = raidSector / layoutPtr->sectorsPerStripeUnit; 284 RF_StripeNum_t FullTableID, FullTableOffset, TableID, TableOffset; 285 RF_StripeNum_t BlockID, BlockOffset, RepIndex; 286 RF_StripeCount_t sus_per_fulltable = info->SUsPerFullTable; 287 RF_StripeCount_t fulltable_depth = info->FullTableDepthInPUs * layoutPtr->SUsPerPU; 288 RF_StripeNum_t base_suid = 0, outSU, SpareRegion = 0, SpareSpace = 0; 289 290 rf_decluster_adjust_params(layoutPtr, &SUID, &sus_per_fulltable, &fulltable_depth, &base_suid); 291 292 FullTableID = SUID / sus_per_fulltable; /* fulltable ID within array 293 * (across rows) */ 294 FullTableID /= /* raidPtr->numRow */ 1; /* convert to fulltable ID on this 295 * disk */ 296 if ((raidPtr->Layout.map->flags & RF_DISTRIBUTE_SPARE)) { 297 SpareRegion = FullTableID / info->FullTablesPerSpareRegion; 298 SpareSpace = SpareRegion * info->SpareSpaceDepthPerRegionInSUs; 299 } 300 FullTableOffset = SUID % sus_per_fulltable; 301 TableID = FullTableOffset / info->SUsPerTable; 302 TableOffset = FullTableOffset - TableID * info->SUsPerTable; 303 BlockID = TableOffset / info->PUsPerBlock; 304 BlockOffset = TableOffset - BlockID * info->PUsPerBlock; 305 BlockID %= info->BlocksPerTable; 306 RF_ASSERT(BlockOffset < info->groupSize - 2); 307 /* 308 TableIDs go from 0 .. GroupSize-1 inclusive. 309 PUsPerBlock is k-2. 310 We want the tableIDs to rotate from the 311 right, so use GroupSize 312 */ 313 RepIndex = info->groupSize - 1 - TableID; 314 RF_ASSERT(RepIndex >= 0); 315 if (!raidPtr->noRotate) { 316 if (TableID == 0) 317 BlockOffset++; /* P on last drive, Q on first */ 318 else 319 BlockOffset += ((BlockOffset >= RepIndex) ? 2 : 0); /* skip over PQ */ 320 RF_ASSERT(BlockOffset < info->groupSize); 321 *col = info->LayoutTable[BlockID][BlockOffset]; 322 } 323 /* remap to distributed spare space if indicated */ 324 if (remap) { 325 rf_remap_to_spare_space(layoutPtr, info, FullTableID, TableID, BlockID, (base_suid) ? 1 : 0, SpareRegion, col, &outSU); 326 } else { 327 328 outSU = base_suid; 329 outSU += FullTableID * fulltable_depth; /* offs to strt of FT */ 330 outSU += SpareSpace; /* skip rsvd spare space */ 331 outSU += TableID * info->TableDepthInPUs * layoutPtr->SUsPerPU; /* offs to strt of tble */ 332 outSU += info->OffsetTable[BlockID][BlockOffset] * layoutPtr->SUsPerPU; /* offs to the PU */ 333 } 334 outSU += TableOffset / (info->BlocksPerTable * info->PUsPerBlock); /* offs to the SU within 335 * a PU */ 336 337 /* convert SUs to sectors, and, if not aligned to SU boundary, add in 338 * offset to sector */ 339 *diskSector = outSU * layoutPtr->sectorsPerStripeUnit + (raidSector % layoutPtr->sectorsPerStripeUnit); 340 } 341 342 343 void 344 rf_MapParityDeclusteredPQ(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector, 345 RF_RowCol_t *col, 346 RF_SectorNum_t *diskSector, int remap) 347 { 348 RF_RaidLayout_t *layoutPtr = &(raidPtr->Layout); 349 RF_DeclusteredConfigInfo_t *info = (RF_DeclusteredConfigInfo_t *) layoutPtr->layoutSpecificInfo; 350 RF_StripeNum_t SUID = raidSector / layoutPtr->sectorsPerStripeUnit; 351 RF_StripeNum_t FullTableID, FullTableOffset, TableID, TableOffset; 352 RF_StripeNum_t BlockID, RepIndex; 353 RF_StripeCount_t sus_per_fulltable = info->SUsPerFullTable; 354 RF_StripeCount_t fulltable_depth = info->FullTableDepthInPUs * layoutPtr->SUsPerPU; 355 RF_StripeNum_t base_suid = 0, outSU, SpareRegion, SpareSpace = 0; 356 357 rf_decluster_adjust_params(layoutPtr, &SUID, &sus_per_fulltable, &fulltable_depth, &base_suid); 358 359 /* compute row & (possibly) spare space exactly as before */ 360 FullTableID = SUID / sus_per_fulltable; 361 FullTableID /= /* raidPtr->numRow */ 1; /* convert to fulltable ID on this 362 * disk */ 363 if ((raidPtr->Layout.map->flags & RF_DISTRIBUTE_SPARE)) { 364 SpareRegion = FullTableID / info->FullTablesPerSpareRegion; 365 SpareSpace = SpareRegion * info->SpareSpaceDepthPerRegionInSUs; 366 } 367 /* compute BlockID and RepIndex exactly as before */ 368 FullTableOffset = SUID % sus_per_fulltable; 369 TableID = FullTableOffset / info->SUsPerTable; 370 TableOffset = FullTableOffset - TableID * info->SUsPerTable; 371 BlockID = TableOffset / info->PUsPerBlock; 372 BlockID %= info->BlocksPerTable; 373 374 /* the parity block is in the position indicated by RepIndex */ 375 RepIndex = (raidPtr->noRotate) ? info->PUsPerBlock : info->groupSize - 1 - TableID; 376 *col = info->LayoutTable[BlockID][RepIndex]; 377 378 if (remap) 379 RF_PANIC(); 380 381 /* compute sector as before, except use RepIndex instead of 382 * BlockOffset */ 383 outSU = base_suid; 384 outSU += FullTableID * fulltable_depth; 385 outSU += SpareSpace; /* skip rsvd spare space */ 386 outSU += TableID * info->TableDepthInPUs * layoutPtr->SUsPerPU; 387 outSU += info->OffsetTable[BlockID][RepIndex] * layoutPtr->SUsPerPU; 388 outSU += TableOffset / (info->BlocksPerTable * info->PUsPerBlock); 389 390 *diskSector = outSU * layoutPtr->sectorsPerStripeUnit + (raidSector % layoutPtr->sectorsPerStripeUnit); 391 } 392 393 void 394 rf_MapQDeclusteredPQ(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector, 395 RF_RowCol_t *col, 396 RF_SectorNum_t *diskSector, int remap) 397 { 398 RF_RaidLayout_t *layoutPtr = &(raidPtr->Layout); 399 RF_DeclusteredConfigInfo_t *info = (RF_DeclusteredConfigInfo_t *) layoutPtr->layoutSpecificInfo; 400 RF_StripeNum_t SUID = raidSector / layoutPtr->sectorsPerStripeUnit; 401 RF_StripeNum_t FullTableID, FullTableOffset, TableID, TableOffset; 402 RF_StripeNum_t BlockID, RepIndex, RepIndexQ; 403 RF_StripeCount_t sus_per_fulltable = info->SUsPerFullTable; 404 RF_StripeCount_t fulltable_depth = info->FullTableDepthInPUs * layoutPtr->SUsPerPU; 405 RF_StripeNum_t base_suid = 0, outSU, SpareRegion, SpareSpace = 0; 406 407 rf_decluster_adjust_params(layoutPtr, &SUID, &sus_per_fulltable, &fulltable_depth, &base_suid); 408 409 /* compute row & (possibly) spare space exactly as before */ 410 FullTableID = SUID / sus_per_fulltable; 411 FullTableID /= /* raidPtr->numRow */ 1; /* convert to fulltable ID on this 412 * disk */ 413 if ((raidPtr->Layout.map->flags & RF_DISTRIBUTE_SPARE)) { 414 SpareRegion = FullTableID / info->FullTablesPerSpareRegion; 415 SpareSpace = SpareRegion * info->SpareSpaceDepthPerRegionInSUs; 416 } 417 /* compute BlockID and RepIndex exactly as before */ 418 FullTableOffset = SUID % sus_per_fulltable; 419 TableID = FullTableOffset / info->SUsPerTable; 420 TableOffset = FullTableOffset - TableID * info->SUsPerTable; 421 BlockID = TableOffset / info->PUsPerBlock; 422 BlockID %= info->BlocksPerTable; 423 424 /* the q block is in the position indicated by RepIndex */ 425 RepIndex = (raidPtr->noRotate) ? info->PUsPerBlock : info->groupSize - 1 - TableID; 426 RepIndexQ = ((RepIndex == (info->groupSize - 1)) ? 0 : RepIndex + 1); 427 *col = info->LayoutTable[BlockID][RepIndexQ]; 428 429 if (remap) 430 RF_PANIC(); 431 432 /* compute sector as before, except use RepIndex instead of 433 * BlockOffset */ 434 outSU = base_suid; 435 outSU += FullTableID * fulltable_depth; 436 outSU += SpareSpace; /* skip rsvd spare space */ 437 outSU += TableID * info->TableDepthInPUs * layoutPtr->SUsPerPU; 438 outSU += TableOffset / (info->BlocksPerTable * info->PUsPerBlock); 439 440 outSU += info->OffsetTable[BlockID][RepIndexQ] * layoutPtr->SUsPerPU; 441 *diskSector = outSU * layoutPtr->sectorsPerStripeUnit + (raidSector % layoutPtr->sectorsPerStripeUnit); 442 } 443 /* returns an array of ints identifying the disks that comprise the stripe containing the indicated address. 444 * the caller must _never_ attempt to modify this array. 445 */ 446 void 447 rf_IdentifyStripeDeclusteredPQ(RF_Raid_t *raidPtr, RF_RaidAddr_t addr, 448 RF_RowCol_t **diskids) 449 { 450 RF_RaidLayout_t *layoutPtr = &(raidPtr->Layout); 451 RF_DeclusteredConfigInfo_t *info = (RF_DeclusteredConfigInfo_t *) layoutPtr->layoutSpecificInfo; 452 RF_StripeCount_t sus_per_fulltable = info->SUsPerFullTable; 453 RF_StripeCount_t fulltable_depth = info->FullTableDepthInPUs * layoutPtr->SUsPerPU; 454 RF_StripeNum_t base_suid = 0; 455 RF_StripeNum_t SUID = rf_RaidAddressToStripeUnitID(layoutPtr, addr); 456 RF_StripeNum_t stripeID; 457 int tableOffset; 458 459 rf_decluster_adjust_params(layoutPtr, &SUID, &sus_per_fulltable, &fulltable_depth, &base_suid); 460 stripeID = rf_StripeUnitIDToStripeID(layoutPtr, SUID); /* find stripe offset 461 * into array */ 462 tableOffset = (stripeID % info->BlocksPerTable); /* find offset into 463 * block design table */ 464 *diskids = info->LayoutTable[tableOffset]; 465 } 466 #endif /* (RF_INCLUDE_PARITY_DECLUSTERING_PQ > 0) || (RF_INCLUDE_EVENODD > 0) */ 467
Indexes created Sun Sep 21 16:09:51 GMT 2025