NetBSD/sys/dev/raidframe/rf_reconutil.c

339 lines
10 KiB
C
Raw Normal View History

/* $NetBSD: rf_reconutil.c,v 1.10 2002/09/17 03:21:41 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_reconutil.c -- reconstruction utilities
********************************************/
2001-11-13 10:11:12 +03:00
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rf_reconutil.c,v 1.10 2002/09/17 03:21:41 oster Exp $");
2001-11-13 10:11:12 +03:00
#include <dev/raidframe/raidframevar.h>
#include "rf_raid.h"
#include "rf_desc.h"
#include "rf_reconutil.h"
#include "rf_reconbuffer.h"
#include "rf_general.h"
#include "rf_decluster.h"
#include "rf_raid5_rotatedspare.h"
#include "rf_interdecluster.h"
#include "rf_chaindecluster.h"
/*******************************************************************
* allocates/frees the reconstruction control information structures
*******************************************************************/
RF_ReconCtrl_t *
rf_MakeReconControl(reconDesc, frow, fcol, srow, scol)
RF_RaidReconDesc_t *reconDesc;
RF_RowCol_t frow; /* failed row and column */
RF_RowCol_t fcol;
RF_RowCol_t srow; /* identifies which spare we're using */
RF_RowCol_t scol;
{
RF_Raid_t *raidPtr = reconDesc->raidPtr;
RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
RF_ReconUnitCount_t RUsPerPU = layoutPtr->SUsPerPU / layoutPtr->SUsPerRU;
RF_ReconUnitCount_t numSpareRUs;
RF_ReconCtrl_t *reconCtrlPtr;
RF_ReconBuffer_t *rbuf;
RF_LayoutSW_t *lp;
int retcode, rc;
RF_RowCol_t i;
lp = raidPtr->Layout.map;
/* make and zero the global reconstruction structure and the per-disk
* structure */
RF_Calloc(reconCtrlPtr, 1, sizeof(RF_ReconCtrl_t), (RF_ReconCtrl_t *));
RF_Calloc(reconCtrlPtr->perDiskInfo, raidPtr->numCol, sizeof(RF_PerDiskReconCtrl_t), (RF_PerDiskReconCtrl_t *)); /* this zeros it */
reconCtrlPtr->reconDesc = reconDesc;
reconCtrlPtr->fcol = fcol;
reconCtrlPtr->spareRow = srow;
reconCtrlPtr->spareCol = scol;
reconCtrlPtr->lastPSID = layoutPtr->numStripe / layoutPtr->SUsPerPU;
reconCtrlPtr->percentComplete = 0;
/* initialize each per-disk recon information structure */
for (i = 0; i < raidPtr->numCol; i++) {
reconCtrlPtr->perDiskInfo[i].reconCtrl = reconCtrlPtr;
reconCtrlPtr->perDiskInfo[i].row = frow;
reconCtrlPtr->perDiskInfo[i].col = i;
reconCtrlPtr->perDiskInfo[i].curPSID = -1; /* make it appear as if
* we just finished an
* RU */
reconCtrlPtr->perDiskInfo[i].ru_count = RUsPerPU - 1;
}
/* Get the number of spare units per disk and the sparemap in case
* spare is distributed */
if (lp->GetNumSpareRUs) {
numSpareRUs = lp->GetNumSpareRUs(raidPtr);
} else {
numSpareRUs = 0;
}
/*
* Not all distributed sparing archs need dynamic mappings
*/
if (lp->InstallSpareTable) {
retcode = rf_InstallSpareTable(raidPtr, frow, fcol);
if (retcode) {
RF_PANIC(); /* XXX fix this */
}
}
/* make the reconstruction map */
reconCtrlPtr->reconMap = rf_MakeReconMap(raidPtr, (int) (layoutPtr->SUsPerRU * layoutPtr->sectorsPerStripeUnit),
raidPtr->sectorsPerDisk, numSpareRUs);
/* make the per-disk reconstruction buffers */
for (i = 0; i < raidPtr->numCol; i++) {
reconCtrlPtr->perDiskInfo[i].rbuf = (i == fcol) ? NULL : rf_MakeReconBuffer(raidPtr, frow, i, RF_RBUF_TYPE_EXCLUSIVE);
}
/* initialize the event queue */
rc = rf_mutex_init(&reconCtrlPtr->eq_mutex);
if (rc) {
/* XXX deallocate, cleanup */
rf_print_unable_to_init_mutex(__FILE__, __LINE__, rc);
return (NULL);
}
rc = rf_cond_init(&reconCtrlPtr->eq_cond);
if (rc) {
/* XXX deallocate, cleanup */
rf_print_unable_to_init_cond(__FILE__, __LINE__, rc);
return (NULL);
}
reconCtrlPtr->eventQueue = NULL;
reconCtrlPtr->eq_count = 0;
/* make the floating recon buffers and append them to the free list */
rc = rf_mutex_init(&reconCtrlPtr->rb_mutex);
if (rc) {
/* XXX deallocate, cleanup */
rf_print_unable_to_init_mutex(__FILE__, __LINE__, rc);
return (NULL);
}
reconCtrlPtr->fullBufferList = NULL;
reconCtrlPtr->priorityList = NULL;
reconCtrlPtr->floatingRbufs = NULL;
reconCtrlPtr->committedRbufs = NULL;
for (i = 0; i < raidPtr->numFloatingReconBufs; i++) {
rbuf = rf_MakeReconBuffer(raidPtr, frow, fcol, RF_RBUF_TYPE_FLOATING);
rbuf->next = reconCtrlPtr->floatingRbufs;
reconCtrlPtr->floatingRbufs = rbuf;
}
/* create the parity stripe status table */
reconCtrlPtr->pssTable = rf_MakeParityStripeStatusTable(raidPtr);
/* set the initial min head sep counter val */
reconCtrlPtr->minHeadSepCounter = 0;
return (reconCtrlPtr);
}
void
rf_FreeReconControl(raidPtr, row)
RF_Raid_t *raidPtr;
RF_RowCol_t row;
{
RF_ReconCtrl_t *reconCtrlPtr = raidPtr->reconControl[row];
RF_ReconBuffer_t *t;
RF_ReconUnitNum_t i;
RF_ASSERT(reconCtrlPtr);
for (i = 0; i < raidPtr->numCol; i++)
if (reconCtrlPtr->perDiskInfo[i].rbuf)
rf_FreeReconBuffer(reconCtrlPtr->perDiskInfo[i].rbuf);
for (i = 0; i < raidPtr->numFloatingReconBufs; i++) {
t = reconCtrlPtr->floatingRbufs;
RF_ASSERT(t);
reconCtrlPtr->floatingRbufs = t->next;
rf_FreeReconBuffer(t);
}
rf_mutex_destroy(&reconCtrlPtr->rb_mutex);
rf_mutex_destroy(&reconCtrlPtr->eq_mutex);
rf_cond_destroy(&reconCtrlPtr->eq_cond);
rf_FreeReconMap(reconCtrlPtr->reconMap);
rf_FreeParityStripeStatusTable(raidPtr, reconCtrlPtr->pssTable);
RF_Free(reconCtrlPtr->perDiskInfo, raidPtr->numCol * sizeof(RF_PerDiskReconCtrl_t));
RF_Free(reconCtrlPtr, sizeof(*reconCtrlPtr));
}
/******************************************************************************
* computes the default head separation limit
*****************************************************************************/
RF_HeadSepLimit_t
rf_GetDefaultHeadSepLimit(raidPtr)
RF_Raid_t *raidPtr;
{
RF_HeadSepLimit_t hsl;
RF_LayoutSW_t *lp;
lp = raidPtr->Layout.map;
if (lp->GetDefaultHeadSepLimit == NULL)
return (-1);
hsl = lp->GetDefaultHeadSepLimit(raidPtr);
return (hsl);
}
/******************************************************************************
* computes the default number of floating recon buffers
*****************************************************************************/
int
rf_GetDefaultNumFloatingReconBuffers(raidPtr)
RF_Raid_t *raidPtr;
{
RF_LayoutSW_t *lp;
int nrb;
lp = raidPtr->Layout.map;
if (lp->GetDefaultNumFloatingReconBuffers == NULL)
return (3 * raidPtr->numCol);
nrb = lp->GetDefaultNumFloatingReconBuffers(raidPtr);
return (nrb);
}
/******************************************************************************
* creates and initializes a reconstruction buffer
*****************************************************************************/
RF_ReconBuffer_t *
rf_MakeReconBuffer(
RF_Raid_t * raidPtr,
RF_RowCol_t row,
RF_RowCol_t col,
RF_RbufType_t type)
{
RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
RF_ReconBuffer_t *t;
u_int recon_buffer_size = rf_RaidAddressToByte(raidPtr, layoutPtr->SUsPerRU * layoutPtr->sectorsPerStripeUnit);
RF_Malloc(t, sizeof(RF_ReconBuffer_t), (RF_ReconBuffer_t *));
RF_Malloc(t->buffer, recon_buffer_size, (caddr_t));
t->raidPtr = raidPtr;
t->row = row;
t->col = col;
t->priority = RF_IO_RECON_PRIORITY;
t->type = type;
t->pssPtr = NULL;
t->next = NULL;
return (t);
}
/******************************************************************************
* frees a reconstruction buffer
*****************************************************************************/
void
rf_FreeReconBuffer(rbuf)
RF_ReconBuffer_t *rbuf;
{
RF_Raid_t *raidPtr = rbuf->raidPtr;
u_int recon_buffer_size;
recon_buffer_size = rf_RaidAddressToByte(raidPtr, raidPtr->Layout.SUsPerRU * raidPtr->Layout.sectorsPerStripeUnit);
RF_Free(rbuf->buffer, recon_buffer_size);
RF_Free(rbuf, sizeof(*rbuf));
}
#if RF_DEBUG_RECON
/******************************************************************************
* debug only: sanity check the number of floating recon bufs in use
*****************************************************************************/
void
rf_CheckFloatingRbufCount(raidPtr, dolock)
RF_Raid_t *raidPtr;
int dolock;
{
RF_ReconParityStripeStatus_t *p;
RF_PSStatusHeader_t *pssTable;
RF_ReconBuffer_t *rbuf;
int i, j, sum = 0;
RF_RowCol_t frow = 0;
for (i = 0; i < raidPtr->numRow; i++)
if (raidPtr->reconControl[i]) {
frow = i;
break;
}
RF_ASSERT(frow >= 0);
if (dolock)
RF_LOCK_MUTEX(raidPtr->reconControl[frow]->rb_mutex);
pssTable = raidPtr->reconControl[frow]->pssTable;
for (i = 0; i < raidPtr->pssTableSize; i++) {
RF_LOCK_MUTEX(pssTable[i].mutex);
for (p = pssTable[i].chain; p; p = p->next) {
rbuf = (RF_ReconBuffer_t *) p->rbuf;
if (rbuf && rbuf->type == RF_RBUF_TYPE_FLOATING)
sum++;
rbuf = (RF_ReconBuffer_t *) p->writeRbuf;
if (rbuf && rbuf->type == RF_RBUF_TYPE_FLOATING)
sum++;
for (j = 0; j < p->xorBufCount; j++) {
rbuf = (RF_ReconBuffer_t *) p->rbufsForXor[j];
RF_ASSERT(rbuf);
if (rbuf->type == RF_RBUF_TYPE_FLOATING)
sum++;
}
}
RF_UNLOCK_MUTEX(pssTable[i].mutex);
}
for (rbuf = raidPtr->reconControl[frow]->floatingRbufs; rbuf; rbuf = rbuf->next) {
if (rbuf->type == RF_RBUF_TYPE_FLOATING)
sum++;
}
for (rbuf = raidPtr->reconControl[frow]->committedRbufs; rbuf; rbuf = rbuf->next) {
if (rbuf->type == RF_RBUF_TYPE_FLOATING)
sum++;
}
for (rbuf = raidPtr->reconControl[frow]->fullBufferList; rbuf; rbuf = rbuf->next) {
if (rbuf->type == RF_RBUF_TYPE_FLOATING)
sum++;
}
for (rbuf = raidPtr->reconControl[frow]->priorityList; rbuf; rbuf = rbuf->next) {
if (rbuf->type == RF_RBUF_TYPE_FLOATING)
sum++;
}
RF_ASSERT(sum == raidPtr->numFloatingReconBufs);
if (dolock)
RF_UNLOCK_MUTEX(raidPtr->reconControl[frow]->rb_mutex);
}
#endif