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NetBSD/sys/dev/raidframe/rf_decluster.c

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/* $NetBSD: rf_decluster.c,v 1.1 1998/11/13 04:20:28 oster Exp $ */
/*
* Copyright (c) 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Mark Holland
*
* 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_decluster.c -- code related to the declustered layout
*
* Created 10-21-92 (MCH)
*
* Nov 93: adding support for distributed sparing. This code is a little
* complex: the basic layout used is as follows:
* let F = (v-1)/GCD(r,v-1). The spare space for each set of
* F consecutive fulltables is grouped together and placed after
* that set of tables.
* +------------------------------+
* | F fulltables |
* | Spare Space |
* | F fulltables |
* | Spare Space |
* | ... |
* +------------------------------+
*
*--------------------------------------------------------------------*/
/*
* :
* Log: rf_decluster.c,v
* Revision 1.51 1996/08/21 19:47:10 jimz
* fix bogus return values from config
*
* Revision 1.50 1996/08/20 22:41:42 jimz
* better diagnostics for bad blockdesigns
*
* Revision 1.49 1996/07/31 16:56:18 jimz
* dataBytesPerStripe, sectorsPerDisk init arch-indep.
*
* Revision 1.48 1996/07/29 14:05:12 jimz
* fix numPUs/numRUs confusion (everything is now numRUs)
* clean up some commenting, return values
*
* Revision 1.47 1996/07/27 23:36:08 jimz
* Solaris port of simulator
*
* Revision 1.46 1996/07/27 18:40:11 jimz
* cleanup sweep
*
* Revision 1.45 1996/07/18 22:57:14 jimz
* port simulator to AIX
*
* Revision 1.44 1996/07/13 00:00:59 jimz
* sanitized generalized reconstruction architecture
* cleaned up head sep, rbuf problems
*
* Revision 1.43 1996/06/19 17:53:48 jimz
* move GetNumSparePUs, InstallSpareTable ops into layout switch
*
* Revision 1.42 1996/06/17 03:23:48 jimz
* switch DeclusteredDS typing
*
* Revision 1.41 1996/06/11 08:55:15 jimz
* improved error-checking at configuration time
*
* Revision 1.40 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 1.39 1996/06/09 02:36:46 jimz
* lots of little crufty cleanup- fixup whitespace
* issues, comment #ifdefs, improve typing in some
* places (esp size-related)
*
* Revision 1.38 1996/06/07 22:26:27 jimz
* type-ify which_ru (RF_ReconUnitNum_t)
*
* Revision 1.37 1996/06/07 21:33:04 jimz
* begin using consistent types for sector numbers,
* stripe numbers, row+col numbers, recon unit numbers
*
* Revision 1.36 1996/06/03 23:28:26 jimz
* more bugfixes
* check in tree to sync for IPDS runs with current bugfixes
* there still may be a problem with threads in the script test
* getting I/Os stuck- not trivially reproducible (runs ~50 times
* in a row without getting stuck)
*
* Revision 1.35 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 1.34 1996/05/30 23:22:16 jimz
* bugfixes of serialization, timing problems
* more cleanup
*
* Revision 1.33 1996/05/30 11:29:41 jimz
* Numerous bug fixes. Stripe lock release code disagreed with the taking code
* about when stripes should be locked (I made it consistent: no parity, no lock)
* There was a lot of extra serialization of I/Os which I've removed- a lot of
* it was to calculate values for the cache code, which is no longer with us.
* More types, function, macro cleanup. Added code to properly quiesce the array
* on shutdown. Made a lot of stuff array-specific which was (bogusly) general
* before. Fixed memory allocation, freeing bugs.
*
* Revision 1.32 1996/05/27 18:56:37 jimz
* more code cleanup
* better typing
* compiles in all 3 environments
*
* Revision 1.31 1996/05/24 01:59:45 jimz
* another checkpoint in code cleanup for release
* time to sync kernel tree
*
* Revision 1.30 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 1.29 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 1.28 1995/12/12 18:10:06 jimz
* MIN -> RF_MIN, MAX -> RF_MAX, ASSERT -> RF_ASSERT
* fix 80-column brain damage in comments
*
* Revision 1.27 1995/12/01 16:00:08 root
* added copyright info
*
* Revision 1.26 1995/11/28 21:35:12 amiri
* set the RF_BD_DECLUSTERED flag
*
* Revision 1.25 1995/11/17 18:56:00 wvcii
* added prototyping to MapParity
*
* Revision 1.24 1995/07/04 22:25:33 holland
* increased default num bufs
*
* Revision 1.23 1995/07/03 20:23:51 holland
* changed floating recon bufs & head sep yet again
*
* Revision 1.22 1995/07/03 18:12:14 holland
* changed the way the number of floating recon bufs & the head sep
* limit are set
*
* Revision 1.21 1995/07/02 15:07:42 holland
* bug fixes related to getting distributed sparing numbers
*
* Revision 1.20 1995/06/23 13:41:28 robby
* updeated to prototypes in rf_layout.h
*
*/
#ifdef _KERNEL
#define KERNEL
#endif
#include "rf_types.h"
#include "rf_raid.h"
#include "rf_raidframe.h"
#include "rf_configure.h"
#include "rf_decluster.h"
#include "rf_debugMem.h"
#include "rf_utils.h"
#include "rf_alloclist.h"
#include "rf_general.h"
#include "rf_shutdown.h"
#include "rf_sys.h"
extern int rf_copyback_in_progress; /* debug only */
/* found in rf_kintf.c */
int rf_GetSpareTableFromDaemon(RF_SparetWait_t *req);
/* configuration code */
int rf_ConfigureDeclustered(
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;
RF_RowCol_t *first_avail_slot;
RF_StripeCount_t complete_FT_count, numCompleteFullTablesPerDisk;
RF_DeclusteredConfigInfo_t *info;
RF_StripeCount_t PUsPerDisk, spareRegionDepthInPUs, numCompleteSpareRegionsPerDisk, extraPUsPerDisk;
RF_StripeCount_t totSparePUsPerDisk;
RF_SectorNum_t diskOffsetOfLastFullTableInSUs;
RF_SectorCount_t SpareSpaceInSUs;
char *cfgBuf = (char *) (cfgPtr->layoutSpecific);
RF_StripeNum_t l, SUID;
SUID = l = 0;
numCompleteSpareRegionsPerDisk = 0;
/* 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;
info->SpareTable = NULL;
/* 2. extract parameters from the config structure */
if (layoutPtr->map->flags & RF_DISTRIBUTE_SPARE) {
(void) bcopy(cfgBuf, info->sparemap_fname, RF_SPAREMAP_NAME_LEN);
}
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);
/* 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 ((layoutPtr->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 the mapping code */
info->BlocksPerTable = b;
info->Lambda = lambda;
info->NumParityReps = info->groupSize = k;
info->SUsPerTable = b * (k-1) * layoutPtr->SUsPerPU;/* b blks, k-1 SUs each */
info->SUsPerFullTable = k * info->SUsPerTable; /* rot k times */
info->PUsPerBlock = k-1;
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 = 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-1);
/* strange evaluation order below to try and minimize overflow problems */
layoutPtr->dataSectorsPerStripe = (k-1) * layoutPtr->sectorsPerStripeUnit;
layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit << raidPtr->logBytesPerSector;
layoutPtr->numDataCol = k-1;
layoutPtr->numParityCol = 1;
return(0);
}
/* declustering with distributed sparing */
static void rf_ShutdownDeclusteredDS(RF_ThreadArg_t);
static void rf_ShutdownDeclusteredDS(arg)
RF_ThreadArg_t arg;
{
RF_DeclusteredConfigInfo_t *info;
RF_Raid_t *raidPtr;
raidPtr = (RF_Raid_t *)arg;
info = (RF_DeclusteredConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
if (info->SpareTable)
rf_FreeSpareTable(raidPtr);
}
int rf_ConfigureDeclusteredDS(
RF_ShutdownList_t **listp,
RF_Raid_t *raidPtr,
RF_Config_t *cfgPtr)
{
int rc;
rc = rf_ConfigureDeclustered(listp, raidPtr, cfgPtr);
if (rc)
return(rc);
rc = rf_ShutdownCreate(listp, rf_ShutdownDeclusteredDS, raidPtr);
if (rc) {
RF_ERRORMSG1("Got %d adding shutdown event for DeclusteredDS\n", rc);
rf_ShutdownDeclusteredDS(raidPtr);
return(rc);
}
return(0);
}
void rf_MapSectorDeclustered(raidPtr, raidSector, row, col, diskSector, remap)
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) */
if (raidPtr->numRow == 1) *row = 0; /* avoid a mod and a div in the common case */
else {
*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;
RepIndex = info->PUsPerBlock - TableID;
if (!raidPtr->noRotate) BlockOffset += ((BlockOffset >= RepIndex) ? 1 : 0);
*col = info->LayoutTable[BlockID][BlockOffset];
/* remap to distributed spare space if indicated */
if (remap) {
RF_ASSERT( raidPtr->Disks[*row][*col].status == rf_ds_reconstructing || raidPtr->Disks[*row][*col].status == rf_ds_dist_spared ||
(rf_copyback_in_progress && raidPtr->Disks[*row][*col].status == rf_ds_optimal));
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);
RF_ASSERT( *col != -1 );
}
/* prototyping this inexplicably causes the compile of the layout table (rf_layout.c) to fail */
void rf_MapParityDeclustered(
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);
/* compute row & (possibly) spare space exactly as before */
FullTableID = SUID / sus_per_fulltable;
if (raidPtr->numRow == 1) *row = 0; /* avoid a mod and a div in the common case */
else {
*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;
/*TableOffset = FullTableOffset % info->SUsPerTable;*/
/*BlockID = (TableOffset / info->PUsPerBlock) % info->BlocksPerTable;*/
BlockID = TableOffset / info->PUsPerBlock;
/*BlockOffset = 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->PUsPerBlock - TableID;
*col = info->LayoutTable[BlockID][RepIndex];
if (remap) {
RF_ASSERT( raidPtr->Disks[*row][*col].status == rf_ds_reconstructing || raidPtr->Disks[*row][*col].status == rf_ds_dist_spared ||
(rf_copyback_in_progress && raidPtr->Disks[*row][*col].status == rf_ds_optimal));
rf_remap_to_spare_space(layoutPtr, info, *row, FullTableID, TableID, BlockID, (base_suid) ? 1 : 0, SpareRegion, col, &outSU);
} else {
/* 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);
RF_ASSERT( *col != -1 );
}
/* 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_IdentifyStripeDeclustered(
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];
}
/* This returns the default head-separation limit, which is measured
* in "required units for reconstruction". Each time a disk fetches
* a unit, it bumps a counter. The head-sep code prohibits any disk
* from getting more than headSepLimit counter values ahead of any
* other.
*
* We assume here that the number of floating recon buffers is already
* set. There are r stripes to be reconstructed in each table, and so
* if we have a total of B buffers, we can have at most B/r tables
* under recon at any one time. In each table, lambda units are required
* from each disk, so given B buffers, the head sep limit has to be
* (lambda*B)/r units. We subtract one to avoid weird boundary cases.
*
* for example, suppose were given 50 buffers, r=19, and lambda=4 as in
* the 20.5 design. There are 19 stripes/table to be reconstructed, so
* we can have 50/19 tables concurrently under reconstruction, which means
* we can allow the fastest disk to get 50/19 tables ahead of the slower
* disk. There are lambda "required units" for each disk, so the fastest
* disk can get 4*50/19 = 10 counter values ahead of the slowest.
*
* If numBufsToAccumulate is not 1, we need to limit the head sep further
* because multiple bufs will be required for each stripe under recon.
*/
RF_HeadSepLimit_t rf_GetDefaultHeadSepLimitDeclustered(
RF_Raid_t *raidPtr)
{
RF_DeclusteredConfigInfo_t *info = (RF_DeclusteredConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
return(info->Lambda * raidPtr->numFloatingReconBufs / info->TableDepthInPUs / rf_numBufsToAccumulate);
}
/* returns the default number of recon buffers to use. The value
* is somewhat arbitrary...it's intended to be large enough to allow
* for a reasonably large head-sep limit, but small enough that you
* don't use up all your system memory with buffers.
*/
int rf_GetDefaultNumFloatingReconBuffersDeclustered(RF_Raid_t *raidPtr)
{
return(100 * rf_numBufsToAccumulate);
}
/* sectors in the last fulltable of the array need to be handled
* specially since this fulltable can be incomplete. this function
* changes the values of certain params to handle this.
*
* the idea here is that MapSector et. al. figure out which disk the
* addressed unit lives on by computing the modulos of the unit number
* with the number of units per fulltable, table, etc. In the last
* fulltable, there are fewer units per fulltable, so we need to adjust
* the number of user data units per fulltable to reflect this.
*
* so, we (1) convert the fulltable size and depth parameters to
* the size of the partial fulltable at the end, (2) compute the
* disk sector offset where this fulltable starts, and (3) convert
* the users stripe unit number from an offset into the array to
* an offset into the last fulltable.
*/
void rf_decluster_adjust_params(
RF_RaidLayout_t *layoutPtr,
RF_StripeNum_t *SUID,
RF_StripeCount_t *sus_per_fulltable,
RF_StripeCount_t *fulltable_depth,
RF_StripeNum_t *base_suid)
{
RF_DeclusteredConfigInfo_t *info = (RF_DeclusteredConfigInfo_t *) layoutPtr->layoutSpecificInfo;
#if defined(__NetBSD__) && defined(_KERNEL)
/* Nothing! */
#else
char pc = layoutPtr->map->parityConfig;
#endif
if (*SUID >= info->FullTableLimitSUID) {
/* new full table size is size of last full table on disk */
*sus_per_fulltable = info->ExtraTablesPerDisk * info->SUsPerTable;
/* new full table depth is corresponding depth */
*fulltable_depth = info->ExtraTablesPerDisk * info->TableDepthInPUs * layoutPtr->SUsPerPU;
/* set up the new base offset */
*base_suid = info->DiskOffsetOfLastFullTableInSUs;
/* convert users array address to an offset into the last fulltable */
*SUID -= info->FullTableLimitSUID;
}
}
/*
* map a stripe ID to a parity stripe ID.
* See comment above RaidAddressToParityStripeID in layout.c.
*/
void rf_MapSIDToPSIDDeclustered(
RF_RaidLayout_t *layoutPtr,
RF_StripeNum_t stripeID,
RF_StripeNum_t *psID,
RF_ReconUnitNum_t *which_ru)
{
RF_DeclusteredConfigInfo_t *info;
info = (RF_DeclusteredConfigInfo_t *) layoutPtr->layoutSpecificInfo;
*psID = (stripeID / (layoutPtr->SUsPerPU * info->BlocksPerTable))
* info->BlocksPerTable + (stripeID % info->BlocksPerTable);
*which_ru = (stripeID % (info->BlocksPerTable * layoutPtr->SUsPerPU))
/ info->BlocksPerTable;
RF_ASSERT( (*which_ru) < layoutPtr->SUsPerPU/layoutPtr->SUsPerRU);
}
/*
* Called from MapSector and MapParity to retarget an access at the spare unit.
* Modifies the "col" and "outSU" parameters only.
*/
void rf_remap_to_spare_space(
RF_RaidLayout_t *layoutPtr,
RF_DeclusteredConfigInfo_t *info,
RF_RowCol_t row,
RF_StripeNum_t FullTableID,
RF_StripeNum_t TableID,
RF_SectorNum_t BlockID,
RF_StripeNum_t base_suid,
RF_StripeNum_t SpareRegion,
RF_RowCol_t *outCol,
RF_StripeNum_t *outSU)
{
RF_StripeNum_t ftID, spareTableStartSU, TableInSpareRegion, lastSROffset, which_ft;
/*
* note that FullTableID and hence SpareRegion may have gotten
* tweaked by rf_decluster_adjust_params. We detect this by
* noticing that base_suid is not 0.
*/
if (base_suid == 0) {
ftID = FullTableID;
}
else {
/*
* There may be > 1.0 full tables in the last (i.e. partial)
* spare region. find out which of these we're in.
*/
lastSROffset = info->NumCompleteSRs * info->SpareRegionDepthInSUs;
which_ft = (info->DiskOffsetOfLastFullTableInSUs - lastSROffset) / (info->FullTableDepthInPUs * layoutPtr->SUsPerPU);
/* compute the actual full table ID */
ftID = info->DiskOffsetOfLastFullTableInSUs / (info->FullTableDepthInPUs * layoutPtr->SUsPerPU) + which_ft;
SpareRegion = info->NumCompleteSRs;
}
TableInSpareRegion = (ftID * info->NumParityReps + TableID) % info->TablesPerSpareRegion;
*outCol = info->SpareTable[TableInSpareRegion][BlockID].spareDisk;
RF_ASSERT( *outCol != -1);
spareTableStartSU = (SpareRegion == info->NumCompleteSRs) ?
info->DiskOffsetOfLastFullTableInSUs + info->ExtraTablesPerDisk * info->TableDepthInPUs * layoutPtr->SUsPerPU :
(SpareRegion+1) * info->SpareRegionDepthInSUs - info->SpareSpaceDepthPerRegionInSUs;
*outSU = spareTableStartSU + info->SpareTable[TableInSpareRegion][BlockID].spareBlockOffsetInSUs;
if (*outSU >= layoutPtr->stripeUnitsPerDisk) {
printf("rf_remap_to_spare_space: invalid remapped disk SU offset %ld\n",(long)*outSU);
}
}
int rf_InstallSpareTable(
RF_Raid_t *raidPtr,
RF_RowCol_t frow,
RF_RowCol_t fcol)
{
RF_DeclusteredConfigInfo_t *info = (RF_DeclusteredConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
RF_SparetWait_t *req;
int retcode;
RF_Malloc(req, sizeof(*req), (RF_SparetWait_t *));
req->C = raidPtr->numCol;
req->G = raidPtr->Layout.numDataCol + raidPtr->Layout.numParityCol;
req->fcol = fcol;
req->SUsPerPU = raidPtr->Layout.SUsPerPU;
req->TablesPerSpareRegion = info->TablesPerSpareRegion;
req->BlocksPerTable = info->BlocksPerTable;
req->TableDepthInPUs = info->TableDepthInPUs;
req->SpareSpaceDepthPerRegionInSUs = info->SpareSpaceDepthPerRegionInSUs;
#ifndef KERNEL
info->SpareTable = rf_ReadSpareTable(req, info->sparemap_fname);
RF_Free(req, sizeof(*req));
retcode = (info->SpareTable) ? 0 : 1;
#else /* !KERNEL */
retcode = rf_GetSpareTableFromDaemon(req);
RF_ASSERT(!retcode); /* XXX -- fix this to recover gracefully -- XXX */
#endif /* !KERNEL */
return(retcode);
}
#ifdef KERNEL
/*
* Invoked via ioctl to install a spare table in the kernel.
*/
int rf_SetSpareTable(raidPtr, data)
RF_Raid_t *raidPtr;
void *data;
{
RF_DeclusteredConfigInfo_t *info = (RF_DeclusteredConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
RF_SpareTableEntry_t **ptrs;
int i, retcode;
/* what we need to copyin is a 2-d array, so first copyin the user pointers to the rows in the table */
RF_Malloc(ptrs, info->TablesPerSpareRegion * sizeof(RF_SpareTableEntry_t *), (RF_SpareTableEntry_t **));
retcode = copyin((caddr_t) data, (caddr_t) ptrs, info->TablesPerSpareRegion * sizeof(RF_SpareTableEntry_t *));
if (retcode) return(retcode);
/* now allocate kernel space for the row pointers */
RF_Malloc(info->SpareTable, info->TablesPerSpareRegion * sizeof(RF_SpareTableEntry_t *), (RF_SpareTableEntry_t **));
/* now allocate kernel space for each row in the table, and copy it in from user space */
for (i=0; i<info->TablesPerSpareRegion; i++) {
RF_Malloc(info->SpareTable[i], info->BlocksPerTable * sizeof(RF_SpareTableEntry_t), (RF_SpareTableEntry_t *));
retcode = copyin(ptrs[i], info->SpareTable[i], info->BlocksPerTable * sizeof(RF_SpareTableEntry_t));
if (retcode) {
info->SpareTable = NULL; /* blow off the memory we've allocated */
return(retcode);
}
}
/* free up the temporary array we used */
RF_Free(ptrs, info->TablesPerSpareRegion * sizeof(RF_SpareTableEntry_t *));
return(0);
}
#endif /* KERNEL */
RF_ReconUnitCount_t rf_GetNumSpareRUsDeclustered(raidPtr)
RF_Raid_t *raidPtr;
{
RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
return( ((RF_DeclusteredConfigInfo_t *) layoutPtr->layoutSpecificInfo)->TotSparePUsPerDisk );
}
void rf_FreeSpareTable(raidPtr)
RF_Raid_t *raidPtr;
{
long i;
RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
RF_DeclusteredConfigInfo_t *info = (RF_DeclusteredConfigInfo_t *) layoutPtr->layoutSpecificInfo;
RF_SpareTableEntry_t **table = info->SpareTable;
for (i=0; i<info->TablesPerSpareRegion; i++) {RF_Free(table[i], info->BlocksPerTable * sizeof(RF_SpareTableEntry_t));}
RF_Free(table, info->TablesPerSpareRegion * sizeof(RF_SpareTableEntry_t *));
info->SpareTable = (RF_SpareTableEntry_t **) NULL;
}
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