diff options
Diffstat (limited to 'sys/dev/raidframe/rf_declusterPQ.c')
| -rw-r--r-- | sys/dev/raidframe/rf_declusterPQ.c | 589 |
1 files changed, 589 insertions, 0 deletions
diff --git a/sys/dev/raidframe/rf_declusterPQ.c b/sys/dev/raidframe/rf_declusterPQ.c new file mode 100644 index 00000000000..75acfa32670 --- /dev/null +++ b/sys/dev/raidframe/rf_declusterPQ.c @@ -0,0 +1,589 @@ +/* $OpenBSD: rf_declusterPQ.c,v 1.1 1999/01/11 14:29:14 niklas Exp $ */ +/* $NetBSD: rf_declusterPQ.c,v 1.1 1998/11/13 04:20:28 oster Exp $ */ +/* + * Copyright (c) 1995 Carnegie-Mellon University. + * All rights reserved. + * + * Authors: Daniel Stodolsky, Mark Holland, Jim Zelenka + * + * Permission to use, copy, modify and distribute this software and + * its documentation is hereby granted, provided that both the copyright + * notice and this permission notice appear in all copies of the + * software, derivative works or modified versions, and any portions + * thereof, and that both notices appear in supporting documentation. + * + * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" + * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND + * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. + * + * Carnegie Mellon requests users of this software to return to + * + * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU + * School of Computer Science + * Carnegie Mellon University + * Pittsburgh PA 15213-3890 + * + * any improvements or extensions that they make and grant Carnegie the + * rights to redistribute these changes. + */ + +/*-------------------------------------------------- + * rf_declusterPQ.c + * + * mapping code for declustered P & Q or declustered EvenOdd + * much code borrowed from rf_decluster.c + * + *--------------------------------------------------*/ + +/* + * $Header: /cvs/OpenBSD/src/sys/dev/raidframe/Attic/rf_declusterPQ.c,v 1.1 1999/01/11 14:29:14 niklas Exp $ + * + * Log: rf_declusterPQ.c,v + * Revision 1.34 1996/08/21 19:47:14 jimz + * fix bogus return values from config + * + * Revision 1.33 1996/08/21 15:09:16 jimz + * cleanup debugging spoo + * + * Revision 1.32 1996/08/21 04:13:36 jimz + * debug with EvenOdd + * + * Revision 1.31 1996/08/20 22:41:54 jimz + * 2 parity disks, not 1 + * + * Revision 1.30 1996/07/31 16:56:18 jimz + * dataBytesPerStripe, sectorsPerDisk init arch-indep. + * + * Revision 1.29 1996/07/18 22:57:14 jimz + * port simulator to AIX + * + * Revision 1.28 1996/07/13 00:00:59 jimz + * sanitized generalized reconstruction architecture + * cleaned up head sep, rbuf problems + * + * Revision 1.27 1996/06/11 08:45:12 jimz + * improved error-checking on array configuration + * + * Revision 1.26 1996/06/10 11:55:47 jimz + * Straightened out some per-array/not-per-array distinctions, fixed + * a couple bugs related to confusion. Added shutdown lists. Removed + * layout shutdown function (now subsumed by shutdown lists). + * + * Revision 1.25 1996/06/07 21:33:04 jimz + * begin using consistent types for sector numbers, + * stripe numbers, row+col numbers, recon unit numbers + * + * Revision 1.24 1996/06/02 17:31:48 jimz + * Moved a lot of global stuff into array structure, where it belongs. + * Fixed up paritylogging, pss modules in this manner. Some general + * code cleanup. Removed lots of dead code, some dead files. + * + * Revision 1.23 1996/05/30 23:22:16 jimz + * bugfixes of serialization, timing problems + * more cleanup + * + * Revision 1.22 1996/05/27 18:56:37 jimz + * more code cleanup + * better typing + * compiles in all 3 environments + * + * Revision 1.21 1996/05/24 22:17:04 jimz + * continue code + namespace cleanup + * typed a bunch of flags + * + * Revision 1.20 1996/05/24 01:59:45 jimz + * another checkpoint in code cleanup for release + * time to sync kernel tree + * + * Revision 1.19 1996/05/23 00:33:23 jimz + * code cleanup: move all debug decls to rf_options.c, all extern + * debug decls to rf_options.h, all debug vars preceded by rf_ + * + * Revision 1.18 1996/05/18 19:51:34 jimz + * major code cleanup- fix syntax, make some types consistent, + * add prototypes, clean out dead code, et cetera + * + * Revision 1.17 1996/05/17 00:52:56 jimz + * RepIndex was not being initialized before the computation of + * RepIndexQ in MapQDeclusteredPQ(). I copied the initialization + * from MapParityDeclusteredPQ(). Hope that was right. + * + * Revision 1.16 1995/12/12 18:10:06 jimz + * MIN -> RF_MIN, MAX -> RF_MAX, ASSERT -> RF_ASSERT + * fix 80-column brain damage in comments + * + * Revision 1.15 1995/12/01 15:57:46 root + * added copyright info + * + * Revision 1.14 1995/11/17 19:00:13 wvcii + * added prototyping to MapParity + * created MapQ + * + * Revision 1.13 1995/10/05 22:20:48 jimz + * free_1d_array() takes two args; provide them both + * + * Revision 1.12 1995/09/06 19:26:33 wvcii + * offset cfgBuf by sparemap length (ConfigureDeclusteredPQ) + * + * Revision 1.11 95/06/23 13:41:11 robby + * updeated to prototypes in rf_layout.h + * + * Revision 1.10 1995/05/02 22:46:53 holland + * minor code cleanups. + * + * Revision 1.9 1995/03/15 20:45:23 holland + * distr sparing changes. + * + * Revision 1.8 1995/03/01 20:25:48 holland + * kernelization changes + * + * Revision 1.7 1995/02/17 19:39:56 holland + * added size param to all calls to Free(). + * this is ignored at user level, but necessary in the kernel. + * + * Revision 1.6 1995/02/10 17:34:10 holland + * kernelization changes + * + * Revision 1.5 1995/02/03 22:31:36 holland + * many changes related to kernelization + * + * Revision 1.4 1995/02/01 15:13:05 holland + * moved #include of general.h out of raid.h and into each file + * + * Revision 1.3 1995/02/01 14:25:19 holland + * began changes for kernelization: + * changed all instances of mutex_t and cond_t to DECLARE macros + * converted configuration code to use config structure + * + * Revision 1.2 1994/11/28 22:13:56 danner + * corrected some mapping bugs. + * + */ + +#include "rf_types.h" +#include "rf_raid.h" +#include "rf_configure.h" +#include "rf_decluster.h" +#include "rf_declusterPQ.h" +#include "rf_debugMem.h" +#include "rf_utils.h" +#include "rf_alloclist.h" +#include "rf_general.h" + +/* configuration code */ + +int rf_ConfigureDeclusteredPQ( + RF_ShutdownList_t **listp, + RF_Raid_t *raidPtr, + RF_Config_t *cfgPtr) +{ + RF_RaidLayout_t *layoutPtr = &(raidPtr->Layout); + int b, v, k, r, lambda; /* block design params */ + int i, j, l; + int *first_avail_slot; + int complete_FT_count, SUID; + RF_DeclusteredConfigInfo_t *info; + int numCompleteFullTablesPerDisk; + int PUsPerDisk, spareRegionDepthInPUs, numCompleteSpareRegionsPerDisk = 0, extraPUsPerDisk; + int totSparePUsPerDisk; + int diskOffsetOfLastFullTableInSUs, SpareSpaceInSUs; + char *cfgBuf = (char *) (cfgPtr->layoutSpecific); + + cfgBuf += RF_SPAREMAP_NAME_LEN; + + b = *( (int *) cfgBuf); cfgBuf += sizeof(int); + v = *( (int *) cfgBuf); cfgBuf += sizeof(int); + k = *( (int *) cfgBuf); cfgBuf += sizeof(int); + r = *( (int *) cfgBuf); cfgBuf += sizeof(int); + lambda = *( (int *) cfgBuf); cfgBuf += sizeof(int); + raidPtr->noRotate = *( (int *) cfgBuf); cfgBuf += sizeof(int); + + if (k <= 2) { + printf("RAIDFRAME: k=%d, minimum value 2\n", k); + return(EINVAL); + } + + /* 1. create layout specific structure */ + RF_MallocAndAdd(info, sizeof(RF_DeclusteredConfigInfo_t), (RF_DeclusteredConfigInfo_t *), raidPtr->cleanupList); + if (info == NULL) + return(ENOMEM); + layoutPtr->layoutSpecificInfo = (void *) info; + + /* the sparemaps are generated assuming that parity is rotated, so we issue + * a warning if both distributed sparing and no-rotate are on at the same time + */ + if ((raidPtr->Layout.map->flags & RF_DISTRIBUTE_SPARE) && raidPtr->noRotate) { + RF_ERRORMSG("Warning: distributed sparing specified without parity rotation.\n"); + } + + if (raidPtr->numCol != v) { + RF_ERRORMSG2("RAID: config error: table element count (%d) not equal to no. of cols (%d)\n", v, raidPtr->numCol); + return(EINVAL); + } + + /* 3. set up the values used in devRaidMap */ + info->BlocksPerTable = b; + info->NumParityReps = info->groupSize = k; + info->PUsPerBlock = k-2; /* PQ */ + info->SUsPerTable = b * info->PUsPerBlock * layoutPtr->SUsPerPU;/* b blks, k-1 SUs each */ + info->SUsPerFullTable = k * info->SUsPerTable; /* rot k times */ + info->SUsPerBlock = info->PUsPerBlock * layoutPtr->SUsPerPU; + info->TableDepthInPUs = (b*k) / v; + info->FullTableDepthInPUs = info->TableDepthInPUs * k; /* k repetitions */ + + /* used only in distributed sparing case */ + info->FullTablesPerSpareRegion = (v-1) / rf_gcd(r, v-1); /* (v-1)/gcd fulltables */ + info->TablesPerSpareRegion = k * info->FullTablesPerSpareRegion; + info->SpareSpaceDepthPerRegionInSUs = (r * info->TablesPerSpareRegion / (v-1)) * layoutPtr->SUsPerPU; + + /* check to make sure the block design is sufficiently small */ + if ((raidPtr->Layout.map->flags & RF_DISTRIBUTE_SPARE)) { + if (info->FullTableDepthInPUs * layoutPtr->SUsPerPU + info->SpareSpaceDepthPerRegionInSUs > layoutPtr->stripeUnitsPerDisk) { + RF_ERRORMSG3("RAID: config error: Full Table depth (%d) + Spare Space (%d) larger than disk size (%d) (BD too big)\n", + (int)info->FullTableDepthInPUs, + (int)info->SpareSpaceDepthPerRegionInSUs, + (int)layoutPtr->stripeUnitsPerDisk); + return(EINVAL); + } + } else { + if (info->TableDepthInPUs * layoutPtr->SUsPerPU > layoutPtr->stripeUnitsPerDisk) { + RF_ERRORMSG2("RAID: config error: Table depth (%d) larger than disk size (%d) (BD too big)\n", + (int)(info->TableDepthInPUs * layoutPtr->SUsPerPU), + (int)layoutPtr->stripeUnitsPerDisk); + return(EINVAL); + } + } + + + /* compute the size of each disk, and the number of tables in the last fulltable (which + * need not be complete) + */ + if ((raidPtr->Layout.map->flags & RF_DISTRIBUTE_SPARE)) { + + PUsPerDisk = layoutPtr->stripeUnitsPerDisk / layoutPtr->SUsPerPU; + spareRegionDepthInPUs = (info->TablesPerSpareRegion * info->TableDepthInPUs + + (info->TablesPerSpareRegion * info->TableDepthInPUs) / (v-1)); + info->SpareRegionDepthInSUs = spareRegionDepthInPUs * layoutPtr->SUsPerPU; + + numCompleteSpareRegionsPerDisk = PUsPerDisk / spareRegionDepthInPUs; + info->NumCompleteSRs = numCompleteSpareRegionsPerDisk; + extraPUsPerDisk = PUsPerDisk % spareRegionDepthInPUs; + + /* assume conservatively that we need the full amount of spare space in one region in order + * to provide spares for the partial spare region at the end of the array. We set "i" to + * the number of tables in the partial spare region. This may actually include some fulltables. + */ + extraPUsPerDisk -= (info->SpareSpaceDepthPerRegionInSUs / layoutPtr->SUsPerPU); + if (extraPUsPerDisk <= 0) i = 0; + else i = extraPUsPerDisk/info->TableDepthInPUs; + + complete_FT_count = raidPtr->numRow * (numCompleteSpareRegionsPerDisk * (info->TablesPerSpareRegion/k) + i/k); + info->FullTableLimitSUID = complete_FT_count * info->SUsPerFullTable; + info->ExtraTablesPerDisk = i % k; + + /* note that in the last spare region, the spare space is complete even though data/parity space is not */ + totSparePUsPerDisk = (numCompleteSpareRegionsPerDisk+1) * (info->SpareSpaceDepthPerRegionInSUs / layoutPtr->SUsPerPU); + info->TotSparePUsPerDisk = totSparePUsPerDisk; + + layoutPtr->stripeUnitsPerDisk = + ((complete_FT_count/raidPtr->numRow) * info->FullTableDepthInPUs + /* data & parity space */ + info->ExtraTablesPerDisk * info->TableDepthInPUs + + totSparePUsPerDisk /* spare space */ + ) * layoutPtr->SUsPerPU; + layoutPtr->dataStripeUnitsPerDisk = + (complete_FT_count * info->FullTableDepthInPUs + info->ExtraTablesPerDisk * info->TableDepthInPUs) + * layoutPtr->SUsPerPU * (k-1) / k; + + } else { + /* non-dist spare case: force each disk to contain an integral number of tables */ + layoutPtr->stripeUnitsPerDisk /= (info->TableDepthInPUs * layoutPtr->SUsPerPU); + layoutPtr->stripeUnitsPerDisk *= (info->TableDepthInPUs * layoutPtr->SUsPerPU); + + /* compute the number of tables in the last fulltable, which need not be complete */ + complete_FT_count = + ((layoutPtr->stripeUnitsPerDisk/layoutPtr->SUsPerPU) / info->FullTableDepthInPUs) * raidPtr->numRow; + + info->FullTableLimitSUID = complete_FT_count * info->SUsPerFullTable; + info->ExtraTablesPerDisk = + ((layoutPtr->stripeUnitsPerDisk/layoutPtr->SUsPerPU) / info->TableDepthInPUs) % k; + } + + raidPtr->sectorsPerDisk = layoutPtr->stripeUnitsPerDisk * layoutPtr->sectorsPerStripeUnit; + + /* find the disk offset of the stripe unit where the last fulltable starts */ + numCompleteFullTablesPerDisk = complete_FT_count / raidPtr->numRow; + diskOffsetOfLastFullTableInSUs = numCompleteFullTablesPerDisk * info->FullTableDepthInPUs * layoutPtr->SUsPerPU; + if ((raidPtr->Layout.map->flags & RF_DISTRIBUTE_SPARE)) { + SpareSpaceInSUs = numCompleteSpareRegionsPerDisk * info->SpareSpaceDepthPerRegionInSUs; + diskOffsetOfLastFullTableInSUs += SpareSpaceInSUs; + info->DiskOffsetOfLastSpareSpaceChunkInSUs = + diskOffsetOfLastFullTableInSUs + info->ExtraTablesPerDisk * info->TableDepthInPUs * layoutPtr->SUsPerPU; + } + info->DiskOffsetOfLastFullTableInSUs = diskOffsetOfLastFullTableInSUs; + info->numCompleteFullTablesPerDisk = numCompleteFullTablesPerDisk; + + /* 4. create and initialize the lookup tables */ + info->LayoutTable = rf_make_2d_array(b, k, raidPtr->cleanupList); + if (info->LayoutTable == NULL) + return(ENOMEM); + info->OffsetTable = rf_make_2d_array(b, k, raidPtr->cleanupList); + if (info->OffsetTable == NULL) + return(ENOMEM); + info->BlockTable = rf_make_2d_array(info->TableDepthInPUs*layoutPtr->SUsPerPU, raidPtr->numCol, raidPtr->cleanupList); + if (info->BlockTable == NULL) + return(ENOMEM); + + first_avail_slot = (int *) rf_make_1d_array(v, NULL); + if (first_avail_slot == NULL) + return(ENOMEM); + + for (i=0; i<b; i++) + for (j=0; j<k; j++) + info->LayoutTable[i][j] = *cfgBuf++; + + /* initialize offset table */ + for (i=0; i<b; i++) for (j=0; j<k; j++) { + info->OffsetTable[i][j] = first_avail_slot[ info->LayoutTable[i][j] ]; + first_avail_slot[ info->LayoutTable[i][j] ]++; + } + + /* initialize block table */ + for (SUID=l=0; l<layoutPtr->SUsPerPU; l++) { + for (i=0; i<b; i++) { + for (j=0; j<k; j++) { + info->BlockTable[ (info->OffsetTable[i][j] * layoutPtr->SUsPerPU) + l ] + [ info->LayoutTable[i][j] ] = SUID; + } + SUID++; + } + } + + rf_free_1d_array(first_avail_slot, v); + + /* 5. set up the remaining redundant-but-useful parameters */ + + raidPtr->totalSectors = (k*complete_FT_count + raidPtr->numRow*info->ExtraTablesPerDisk) * + info->SUsPerTable * layoutPtr->sectorsPerStripeUnit; + layoutPtr->numStripe = (raidPtr->totalSectors / layoutPtr->sectorsPerStripeUnit) / (k-2); + + /* strange evaluation order below to try and minimize overflow problems */ + + layoutPtr->dataSectorsPerStripe = (k-2) * layoutPtr->sectorsPerStripeUnit; + layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit << raidPtr->logBytesPerSector; + layoutPtr->numDataCol = k-2; + layoutPtr->numParityCol = 2; + + return(0); +} + +int rf_GetDefaultNumFloatingReconBuffersPQ(RF_Raid_t *raidPtr) +{ + int def_decl; + + def_decl = rf_GetDefaultNumFloatingReconBuffersDeclustered(raidPtr); + return(RF_MAX(3 * raidPtr->numCol, def_decl)); +} + +void rf_MapSectorDeclusteredPQ( + RF_Raid_t *raidPtr, + RF_RaidAddr_t raidSector, + RF_RowCol_t *row, + RF_RowCol_t *col, + RF_SectorNum_t *diskSector, + int remap) +{ + RF_RaidLayout_t *layoutPtr = &(raidPtr->Layout); + RF_DeclusteredConfigInfo_t *info = (RF_DeclusteredConfigInfo_t *) layoutPtr->layoutSpecificInfo; + RF_StripeNum_t SUID = raidSector / layoutPtr->sectorsPerStripeUnit; + RF_StripeNum_t FullTableID, FullTableOffset, TableID, TableOffset; + RF_StripeNum_t BlockID, BlockOffset, RepIndex; + RF_StripeCount_t sus_per_fulltable = info->SUsPerFullTable; + RF_StripeCount_t fulltable_depth = info->FullTableDepthInPUs * layoutPtr->SUsPerPU; + RF_StripeNum_t base_suid = 0, outSU, SpareRegion=0, SpareSpace=0; + + rf_decluster_adjust_params(layoutPtr, &SUID, &sus_per_fulltable, &fulltable_depth, &base_suid); + + FullTableID = SUID / sus_per_fulltable; /* fulltable ID within array (across rows) */ + *row = FullTableID % raidPtr->numRow; + FullTableID /= raidPtr->numRow; /* convert to fulltable ID on this disk */ + if ((raidPtr->Layout.map->flags & RF_DISTRIBUTE_SPARE)) { + SpareRegion = FullTableID / info->FullTablesPerSpareRegion; + SpareSpace = SpareRegion * info->SpareSpaceDepthPerRegionInSUs; + } + FullTableOffset = SUID % sus_per_fulltable; + TableID = FullTableOffset / info->SUsPerTable; + TableOffset = FullTableOffset - TableID * info->SUsPerTable; + BlockID = TableOffset / info->PUsPerBlock; + BlockOffset = TableOffset - BlockID * info->PUsPerBlock; + BlockID %= info->BlocksPerTable; + RF_ASSERT(BlockOffset < info->groupSize-2 ); + /* + TableIDs go from 0 .. GroupSize-1 inclusive. + PUsPerBlock is k-2. + We want the tableIDs to rotate from the + right, so use GroupSize + */ + RepIndex = info->groupSize - 1 - TableID; + RF_ASSERT(RepIndex >= 0); + if (!raidPtr->noRotate) + { + if (TableID==0) + BlockOffset++; /* P on last drive, Q on first */ + else + BlockOffset += ((BlockOffset >= RepIndex) ? 2 : 0); /* skip over PQ */ + RF_ASSERT(BlockOffset < info->groupSize); + *col = info->LayoutTable[BlockID][BlockOffset]; + } + + /* remap to distributed spare space if indicated */ + if (remap) { + rf_remap_to_spare_space(layoutPtr, info, *row, FullTableID, TableID, BlockID, (base_suid) ? 1 : 0, SpareRegion, col, &outSU); + } else { + + outSU = base_suid; + outSU += FullTableID * fulltable_depth; /* offs to strt of FT */ + outSU += SpareSpace; /* skip rsvd spare space */ + outSU += TableID * info->TableDepthInPUs * layoutPtr->SUsPerPU; /* offs to strt of tble */ + outSU += info->OffsetTable[BlockID][BlockOffset] * layoutPtr->SUsPerPU; /* offs to the PU */ + } + outSU += TableOffset / (info->BlocksPerTable * info->PUsPerBlock); /* offs to the SU within a PU */ + + /* convert SUs to sectors, and, if not aligned to SU boundary, add in offset to sector */ + *diskSector = outSU*layoutPtr->sectorsPerStripeUnit + (raidSector % layoutPtr->sectorsPerStripeUnit); +} + + +void rf_MapParityDeclusteredPQ( + RF_Raid_t *raidPtr, + RF_RaidAddr_t raidSector, + RF_RowCol_t *row, + RF_RowCol_t *col, + RF_SectorNum_t *diskSector, + int remap) +{ + RF_RaidLayout_t *layoutPtr = &(raidPtr->Layout); + RF_DeclusteredConfigInfo_t *info = (RF_DeclusteredConfigInfo_t *) layoutPtr->layoutSpecificInfo; + RF_StripeNum_t SUID = raidSector / layoutPtr->sectorsPerStripeUnit; + RF_StripeNum_t FullTableID, FullTableOffset, TableID, TableOffset; + RF_StripeNum_t BlockID, BlockOffset, RepIndex; + RF_StripeCount_t sus_per_fulltable = info->SUsPerFullTable; + RF_StripeCount_t fulltable_depth = info->FullTableDepthInPUs * layoutPtr->SUsPerPU; + RF_StripeNum_t base_suid = 0, outSU, SpareRegion, SpareSpace=0; + + rf_decluster_adjust_params(layoutPtr, &SUID, &sus_per_fulltable, &fulltable_depth, &base_suid); + + /* compute row & (possibly) spare space exactly as before */ + FullTableID = SUID / sus_per_fulltable; + *row = FullTableID % raidPtr->numRow; + FullTableID /= raidPtr->numRow; /* convert to fulltable ID on this disk */ + if ((raidPtr->Layout.map->flags & RF_DISTRIBUTE_SPARE)) { + SpareRegion = FullTableID / info->FullTablesPerSpareRegion; + SpareSpace = SpareRegion * info->SpareSpaceDepthPerRegionInSUs; + } + + /* compute BlockID and RepIndex exactly as before */ + FullTableOffset = SUID % sus_per_fulltable; + TableID = FullTableOffset / info->SUsPerTable; + TableOffset = FullTableOffset - TableID * info->SUsPerTable; + BlockID = TableOffset / info->PUsPerBlock; + BlockOffset = TableOffset - BlockID * info->PUsPerBlock; + BlockID %= info->BlocksPerTable; + + /* the parity block is in the position indicated by RepIndex */ + RepIndex = (raidPtr->noRotate) ? info->PUsPerBlock : info->groupSize - 1 - TableID; + *col = info->LayoutTable[BlockID][RepIndex]; + + if (remap) + RF_PANIC(); + + /* compute sector as before, except use RepIndex instead of BlockOffset */ + outSU = base_suid; + outSU += FullTableID * fulltable_depth; + outSU += SpareSpace; /* skip rsvd spare space */ + outSU += TableID * info->TableDepthInPUs * layoutPtr->SUsPerPU; + outSU += info->OffsetTable[BlockID][RepIndex] * layoutPtr->SUsPerPU; + outSU += TableOffset / (info->BlocksPerTable * info->PUsPerBlock); + + *diskSector = outSU*layoutPtr->sectorsPerStripeUnit + (raidSector % layoutPtr->sectorsPerStripeUnit); +} + +void rf_MapQDeclusteredPQ( + RF_Raid_t *raidPtr, + RF_RaidAddr_t raidSector, + RF_RowCol_t *row, + RF_RowCol_t *col, + RF_SectorNum_t *diskSector, + int remap) +{ + RF_RaidLayout_t *layoutPtr = &(raidPtr->Layout); + RF_DeclusteredConfigInfo_t *info = (RF_DeclusteredConfigInfo_t *) layoutPtr->layoutSpecificInfo; + RF_StripeNum_t SUID = raidSector / layoutPtr->sectorsPerStripeUnit; + RF_StripeNum_t FullTableID, FullTableOffset, TableID, TableOffset; + RF_StripeNum_t BlockID, BlockOffset, RepIndex, RepIndexQ; + RF_StripeCount_t sus_per_fulltable = info->SUsPerFullTable; + RF_StripeCount_t fulltable_depth = info->FullTableDepthInPUs * layoutPtr->SUsPerPU; + RF_StripeNum_t base_suid = 0, outSU, SpareRegion, SpareSpace=0; + + rf_decluster_adjust_params(layoutPtr, &SUID, &sus_per_fulltable, &fulltable_depth, &base_suid); + + /* compute row & (possibly) spare space exactly as before */ + FullTableID = SUID / sus_per_fulltable; + *row = FullTableID % raidPtr->numRow; + FullTableID /= raidPtr->numRow; /* convert to fulltable ID on this disk */ + if ((raidPtr->Layout.map->flags & RF_DISTRIBUTE_SPARE)) { + SpareRegion = FullTableID / info->FullTablesPerSpareRegion; + SpareSpace = SpareRegion * info->SpareSpaceDepthPerRegionInSUs; + } + + /* compute BlockID and RepIndex exactly as before */ + FullTableOffset = SUID % sus_per_fulltable; + TableID = FullTableOffset / info->SUsPerTable; + TableOffset = FullTableOffset - TableID * info->SUsPerTable; + BlockID = TableOffset / info->PUsPerBlock; + BlockOffset = TableOffset - BlockID * info->PUsPerBlock; + BlockID %= info->BlocksPerTable; + + /* the q block is in the position indicated by RepIndex */ + RepIndex = (raidPtr->noRotate) ? info->PUsPerBlock : info->groupSize - 1 - TableID; + RepIndexQ = ((RepIndex == (info->groupSize-1)) ? 0 : RepIndex+1); + *col = info->LayoutTable[BlockID][RepIndexQ]; + + if (remap) + RF_PANIC(); + + /* compute sector as before, except use RepIndex instead of BlockOffset */ + outSU = base_suid; + outSU += FullTableID * fulltable_depth; + outSU += SpareSpace; /* skip rsvd spare space */ + outSU += TableID * info->TableDepthInPUs * layoutPtr->SUsPerPU; + outSU += TableOffset / (info->BlocksPerTable * info->PUsPerBlock); + + outSU += info->OffsetTable[BlockID][RepIndexQ] * layoutPtr->SUsPerPU; + *diskSector = outSU*layoutPtr->sectorsPerStripeUnit + (raidSector % layoutPtr->sectorsPerStripeUnit); +} + +/* returns an array of ints identifying the disks that comprise the stripe containing the indicated address. + * the caller must _never_ attempt to modify this array. + */ +void rf_IdentifyStripeDeclusteredPQ( + RF_Raid_t *raidPtr, + RF_RaidAddr_t addr, + RF_RowCol_t **diskids, + RF_RowCol_t *outRow) +{ + RF_RaidLayout_t *layoutPtr = &(raidPtr->Layout); + RF_DeclusteredConfigInfo_t *info = (RF_DeclusteredConfigInfo_t *) layoutPtr->layoutSpecificInfo; + RF_StripeCount_t sus_per_fulltable = info->SUsPerFullTable; + RF_StripeCount_t fulltable_depth = info->FullTableDepthInPUs * layoutPtr->SUsPerPU; + RF_StripeNum_t base_suid = 0; + RF_StripeNum_t SUID = rf_RaidAddressToStripeUnitID(layoutPtr, addr); + RF_StripeNum_t stripeID, FullTableID; + int tableOffset; + + rf_decluster_adjust_params(layoutPtr, &SUID, &sus_per_fulltable, &fulltable_depth, &base_suid); + FullTableID = SUID / sus_per_fulltable; /* fulltable ID within array (across rows) */ + *outRow = FullTableID % raidPtr->numRow; + stripeID = rf_StripeUnitIDToStripeID(layoutPtr, SUID); /* find stripe offset into array */ + tableOffset = (stripeID % info->BlocksPerTable); /* find offset into block design table */ + *diskids = info->LayoutTable[tableOffset]; +} |