311 lines
9.5 KiB
C
311 lines
9.5 KiB
C
/* $NetBSD: rf_reconutil.c,v 1.28 2007/03/04 06:02:39 christos Exp $ */
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/*
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* Copyright (c) 1995 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Mark Holland
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/********************************************
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* rf_reconutil.c -- reconstruction utilities
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********************************************/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: rf_reconutil.c,v 1.28 2007/03/04 06:02:39 christos Exp $");
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#include <dev/raidframe/raidframevar.h>
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#include "rf_raid.h"
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#include "rf_desc.h"
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#include "rf_reconutil.h"
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#include "rf_reconbuffer.h"
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#include "rf_general.h"
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#include "rf_decluster.h"
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#include "rf_raid5_rotatedspare.h"
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#include "rf_interdecluster.h"
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#include "rf_chaindecluster.h"
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/*******************************************************************
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* allocates/frees the reconstruction control information structures
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*******************************************************************/
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/* fcol - failed column
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* scol - identifies which spare we are using
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*/
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RF_ReconCtrl_t *
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rf_MakeReconControl(RF_RaidReconDesc_t *reconDesc,
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RF_RowCol_t fcol, RF_RowCol_t scol)
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{
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RF_Raid_t *raidPtr = reconDesc->raidPtr;
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RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
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RF_ReconUnitCount_t RUsPerPU = layoutPtr->SUsPerPU / layoutPtr->SUsPerRU;
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RF_ReconUnitCount_t numSpareRUs;
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RF_ReconCtrl_t *reconCtrlPtr;
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RF_ReconBuffer_t *rbuf;
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const RF_LayoutSW_t *lp;
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#if (RF_INCLUDE_PARITY_DECLUSTERING_DS > 0)
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int retcode;
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#endif
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RF_RowCol_t i;
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lp = raidPtr->Layout.map;
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/* make and zero the global reconstruction structure and the per-disk
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* structure */
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RF_Malloc(reconCtrlPtr, sizeof(RF_ReconCtrl_t), (RF_ReconCtrl_t *));
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/* note: this zeros the perDiskInfo */
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RF_Malloc(reconCtrlPtr->perDiskInfo, raidPtr->numCol *
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sizeof(RF_PerDiskReconCtrl_t), (RF_PerDiskReconCtrl_t *));
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reconCtrlPtr->reconDesc = reconDesc;
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reconCtrlPtr->fcol = fcol;
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reconCtrlPtr->spareCol = scol;
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reconCtrlPtr->lastPSID = layoutPtr->numStripe / layoutPtr->SUsPerPU;
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reconCtrlPtr->percentComplete = 0;
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reconCtrlPtr->error = 0;
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reconCtrlPtr->pending_writes = 0;
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/* initialize each per-disk recon information structure */
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for (i = 0; i < raidPtr->numCol; i++) {
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reconCtrlPtr->perDiskInfo[i].reconCtrl = reconCtrlPtr;
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reconCtrlPtr->perDiskInfo[i].col = i;
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/* make it appear as if we just finished an RU */
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reconCtrlPtr->perDiskInfo[i].curPSID = -1;
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reconCtrlPtr->perDiskInfo[i].ru_count = RUsPerPU - 1;
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}
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/* Get the number of spare units per disk and the sparemap in case
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* spare is distributed */
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if (lp->GetNumSpareRUs) {
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numSpareRUs = lp->GetNumSpareRUs(raidPtr);
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} else {
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numSpareRUs = 0;
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}
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#if (RF_INCLUDE_PARITY_DECLUSTERING_DS > 0)
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/*
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* Not all distributed sparing archs need dynamic mappings
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*/
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if (lp->InstallSpareTable) {
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retcode = rf_InstallSpareTable(raidPtr, 0, fcol);
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if (retcode) {
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RF_PANIC(); /* XXX fix this */
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}
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}
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#endif
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/* make the reconstruction map */
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reconCtrlPtr->reconMap = rf_MakeReconMap(raidPtr, (int) (layoutPtr->SUsPerRU * layoutPtr->sectorsPerStripeUnit),
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raidPtr->sectorsPerDisk, numSpareRUs);
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/* make the per-disk reconstruction buffers */
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for (i = 0; i < raidPtr->numCol; i++) {
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reconCtrlPtr->perDiskInfo[i].rbuf = (i == fcol) ? NULL : rf_MakeReconBuffer(raidPtr, i, RF_RBUF_TYPE_EXCLUSIVE);
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}
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/* initialize the event queue */
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simple_lock_init(&reconCtrlPtr->eq_mutex);
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reconCtrlPtr->eventQueue = NULL;
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reconCtrlPtr->eq_count = 0;
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/* make the floating recon buffers and append them to the free list */
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simple_lock_init(&reconCtrlPtr->rb_mutex);
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reconCtrlPtr->fullBufferList = NULL;
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reconCtrlPtr->floatingRbufs = NULL;
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reconCtrlPtr->committedRbufs = NULL;
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for (i = 0; i < raidPtr->numFloatingReconBufs; i++) {
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rbuf = rf_MakeReconBuffer(raidPtr, fcol,
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RF_RBUF_TYPE_FLOATING);
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rbuf->next = reconCtrlPtr->floatingRbufs;
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reconCtrlPtr->floatingRbufs = rbuf;
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}
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/* create the parity stripe status table */
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reconCtrlPtr->pssTable = rf_MakeParityStripeStatusTable(raidPtr);
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/* set the initial min head sep counter val */
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reconCtrlPtr->minHeadSepCounter = 0;
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return (reconCtrlPtr);
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}
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void
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rf_FreeReconControl(RF_Raid_t *raidPtr)
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{
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RF_ReconCtrl_t *reconCtrlPtr = raidPtr->reconControl;
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RF_ReconBuffer_t *t;
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RF_ReconUnitNum_t i;
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RF_ASSERT(reconCtrlPtr);
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for (i = 0; i < raidPtr->numCol; i++)
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if (reconCtrlPtr->perDiskInfo[i].rbuf)
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rf_FreeReconBuffer(reconCtrlPtr->perDiskInfo[i].rbuf);
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t = reconCtrlPtr->floatingRbufs;
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while (t) {
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reconCtrlPtr->floatingRbufs = t->next;
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rf_FreeReconBuffer(t);
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t = reconCtrlPtr->floatingRbufs;
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}
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rf_FreeReconMap(reconCtrlPtr->reconMap);
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rf_FreeParityStripeStatusTable(raidPtr, reconCtrlPtr->pssTable);
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RF_Free(reconCtrlPtr->perDiskInfo,
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raidPtr->numCol * sizeof(RF_PerDiskReconCtrl_t));
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RF_Free(reconCtrlPtr, sizeof(*reconCtrlPtr));
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}
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/******************************************************************************
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* computes the default head separation limit
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*****************************************************************************/
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RF_HeadSepLimit_t
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rf_GetDefaultHeadSepLimit(RF_Raid_t *raidPtr)
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{
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RF_HeadSepLimit_t hsl;
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const RF_LayoutSW_t *lp;
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lp = raidPtr->Layout.map;
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if (lp->GetDefaultHeadSepLimit == NULL)
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return (-1);
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hsl = lp->GetDefaultHeadSepLimit(raidPtr);
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return (hsl);
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}
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/******************************************************************************
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* computes the default number of floating recon buffers
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*****************************************************************************/
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int
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rf_GetDefaultNumFloatingReconBuffers(RF_Raid_t *raidPtr)
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{
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const RF_LayoutSW_t *lp;
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int nrb;
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lp = raidPtr->Layout.map;
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if (lp->GetDefaultNumFloatingReconBuffers == NULL)
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return (3 * raidPtr->numCol);
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nrb = lp->GetDefaultNumFloatingReconBuffers(raidPtr);
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return (nrb);
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}
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/******************************************************************************
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* creates and initializes a reconstruction buffer
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*****************************************************************************/
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RF_ReconBuffer_t *
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rf_MakeReconBuffer(RF_Raid_t *raidPtr, RF_RowCol_t col, RF_RbufType_t type)
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{
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RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
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RF_ReconBuffer_t *t;
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u_int recon_buffer_size = rf_RaidAddressToByte(raidPtr, layoutPtr->SUsPerRU * layoutPtr->sectorsPerStripeUnit);
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t = pool_get(&rf_pools.reconbuffer, PR_WAITOK);
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RF_Malloc(t->buffer, recon_buffer_size, (void *));
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t->raidPtr = raidPtr;
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t->col = col;
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t->priority = RF_IO_RECON_PRIORITY;
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t->type = type;
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t->pssPtr = NULL;
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t->next = NULL;
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return (t);
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}
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/******************************************************************************
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* frees a reconstruction buffer
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*****************************************************************************/
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void
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rf_FreeReconBuffer(RF_ReconBuffer_t *rbuf)
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{
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RF_Raid_t *raidPtr = rbuf->raidPtr;
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u_int recon_buffer_size;
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recon_buffer_size = rf_RaidAddressToByte(raidPtr, raidPtr->Layout.SUsPerRU * raidPtr->Layout.sectorsPerStripeUnit);
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RF_Free(rbuf->buffer, recon_buffer_size);
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pool_put(&rf_pools.reconbuffer, rbuf);
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}
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#if RF_DEBUG_RECON
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XXXX IF you use this, you really want to fix the locking in here.
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/******************************************************************************
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* debug only: sanity check the number of floating recon bufs in use
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*****************************************************************************/
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void
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rf_CheckFloatingRbufCount(RF_Raid_t *raidPtr, int dolock)
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{
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RF_ReconParityStripeStatus_t *p;
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RF_PSStatusHeader_t *pssTable;
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RF_ReconBuffer_t *rbuf;
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int i, j, sum = 0;
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if (dolock)
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RF_LOCK_MUTEX(raidPtr->reconControl->rb_mutex);
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pssTable = raidPtr->reconControl->pssTable;
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for (i = 0; i < raidPtr->pssTableSize; i++) {
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RF_LOCK_MUTEX(pssTable[i].mutex);
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for (p = pssTable[i].chain; p; p = p->next) {
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rbuf = (RF_ReconBuffer_t *) p->rbuf;
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if (rbuf && rbuf->type == RF_RBUF_TYPE_FLOATING)
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sum++;
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rbuf = (RF_ReconBuffer_t *) p->writeRbuf;
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if (rbuf && rbuf->type == RF_RBUF_TYPE_FLOATING)
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sum++;
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for (j = 0; j < p->xorBufCount; j++) {
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rbuf = (RF_ReconBuffer_t *) p->rbufsForXor[j];
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RF_ASSERT(rbuf);
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if (rbuf->type == RF_RBUF_TYPE_FLOATING)
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sum++;
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}
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}
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RF_UNLOCK_MUTEX(pssTable[i].mutex);
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}
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for (rbuf = raidPtr->reconControl->floatingRbufs; rbuf;
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rbuf = rbuf->next) {
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if (rbuf->type == RF_RBUF_TYPE_FLOATING)
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sum++;
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}
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for (rbuf = raidPtr->reconControl->committedRbufs; rbuf;
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rbuf = rbuf->next) {
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if (rbuf->type == RF_RBUF_TYPE_FLOATING)
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sum++;
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}
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for (rbuf = raidPtr->reconControl->fullBufferList; rbuf;
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rbuf = rbuf->next) {
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if (rbuf->type == RF_RBUF_TYPE_FLOATING)
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sum++;
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}
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RF_ASSERT(sum == raidPtr->numFloatingReconBufs);
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if (dolock)
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RF_UNLOCK_MUTEX(raidPtr->reconControl->rb_mutex);
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}
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#endif
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