/* $OpenBSD: rf_parityloggingdags.c,v 1.4 2002/12/16 07:01:04 tdeval Exp $ */
/* $NetBSD: rf_parityloggingdags.c,v 1.4 2000/01/07 03:41:04 oster Exp $ */
/*
* Copyright (c) 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: William V. Courtright II
*
* 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.
*/
#include "rf_archs.h"
#if RF_INCLUDE_PARITYLOGGING > 0
/*
* DAGs specific to parity logging are created here.
*/
#include "rf_types.h"
#include "rf_raid.h"
#include "rf_dag.h"
#include "rf_dagutils.h"
#include "rf_dagfuncs.h"
#include "rf_debugMem.h"
#include "rf_paritylog.h"
#include "rf_memchunk.h"
#include "rf_general.h"
#include "rf_parityloggingdags.h"
/*****************************************************************************
*
* Creates a DAG to perform a large-write operation:
*
* / Rod \ / Wnd \
* H -- NIL- Rod - NIL - Wnd ------ NIL - T
* \ Rod / \ Xor - Lpo /
*
* The writes are not done until the reads complete because if they were done
* in parallel, a failure on one of the reads could leave the parity in an
* inconsistent state, so that the retry with a new DAG would produce
* erroneous parity.
*
* Note: This DAG has the nasty property that none of the buffers allocated
* for reading old data can be freed until the XOR node fires.
* Need to fix this.
*
* The last two arguments are the number of faults tolerated, and function
* for the redundancy calculation. The undo for the redundancy calc is assumed
* to be null.
*
*****************************************************************************/
void
rf_CommonCreateParityLoggingLargeWriteDAG(RF_Raid_t * raidPtr,
RF_AccessStripeMap_t *asmap, RF_DagHeader_t *dag_h, void *bp,
RF_RaidAccessFlags_t flags, RF_AllocListElem_t *allocList, int nfaults,
int (*redFunc) (RF_DagNode_t *))
{
RF_DagNode_t *nodes, *wndNodes, *rodNodes = NULL, *syncNode, *xorNode;
RF_DagNode_t *lpoNode, *blockNode, *unblockNode, *termNode;
int nWndNodes, nRodNodes, i;
RF_RaidLayout_t *layoutPtr = &(raidPtr->Layout);
RF_AccessStripeMapHeader_t *new_asm_h[2];
int nodeNum, asmNum;
RF_ReconUnitNum_t which_ru;
char *sosBuffer, *eosBuffer;
RF_PhysDiskAddr_t *pda;
RF_StripeNum_t parityStripeID =
rf_RaidAddressToParityStripeID(&(raidPtr->Layout),
asmap->raidAddress, &which_ru);
if (rf_dagDebug)
printf("[Creating parity-logging large-write DAG]\n");
RF_ASSERT(nfaults == 1); /* This arch only single fault tolerant. */
dag_h->creator = "ParityLoggingLargeWriteDAG";
/* Alloc the Wnd nodes, the xor node, and the Lpo node. */
nWndNodes = asmap->numStripeUnitsAccessed;
RF_CallocAndAdd(nodes, nWndNodes + 6, sizeof(RF_DagNode_t),
(RF_DagNode_t *), allocList);
i = 0;
wndNodes = &nodes[i];
i += nWndNodes;
xorNode = &nodes[i];
i += 1;
lpoNode = &nodes[i];
i += 1;
blockNode = &nodes[i];
i += 1;
syncNode = &nodes[i];
i += 1;
unblockNode = &nodes[i];
i += 1;
termNode = &nodes[i];
i += 1;
dag_h->numCommitNodes = nWndNodes + 1;
dag_h->numCommits = 0;
dag_h->numSuccedents = 1;
rf_MapUnaccessedPortionOfStripe(raidPtr, layoutPtr, asmap, dag_h,
new_asm_h, &nRodNodes, &sosBuffer, &eosBuffer, allocList);
if (nRodNodes > 0)
RF_CallocAndAdd(rodNodes, nRodNodes, sizeof(RF_DagNode_t),
(RF_DagNode_t *), allocList);
/* Begin node initialization. */
rf_InitNode(blockNode, rf_wait, RF_FALSE, rf_NullNodeFunc,
rf_NullNodeUndoFunc, NULL, nRodNodes + 1, 0, 0, 0, dag_h,
"Nil", allocList);
rf_InitNode(unblockNode, rf_wait, RF_FALSE, rf_NullNodeFunc,
rf_NullNodeUndoFunc, NULL, 1, nWndNodes + 1, 0, 0, dag_h,
"Nil", allocList);
rf_InitNode(syncNode, rf_wait, RF_FALSE, rf_NullNodeFunc,
rf_NullNodeUndoFunc, NULL, nWndNodes + 1, nRodNodes + 1,
0, 0, dag_h, "Nil", allocList);
rf_InitNode(termNode, rf_wait, RF_FALSE, rf_TerminateFunc,
rf_TerminateUndoFunc, NULL, 0, 1, 0, 0, dag_h, "Trm", allocList);
/* Initialize the Rod nodes. */
for (nodeNum = asmNum = 0; asmNum < 2; asmNum++) {
if (new_asm_h[asmNum]) {
pda = new_asm_h[asmNum]->stripeMap->physInfo;
while (pda) {
rf_InitNode(&rodNodes[nodeNum], rf_wait,
RF_FALSE, rf_DiskReadFunc,
rf_DiskReadUndoFunc, rf_GenericWakeupFunc,
1, 1, 4, 0, dag_h, "Rod", allocList);
rodNodes[nodeNum].params[0].p = pda;
rodNodes[nodeNum].params[1].p = pda->bufPtr;
rodNodes[nodeNum].params[2].v = parityStripeID;
rodNodes[nodeNum].params[3].v =
RF_CREATE_PARAM3(RF_IO_NORMAL_PRIORITY,
0, 0, which_ru);
nodeNum++;
pda = pda->next;
}
}
}
RF_ASSERT(nodeNum == nRodNodes);
/* Initialize the wnd nodes. */
pda = asmap->physInfo;
for (i = 0; i < nWndNodes; i++) {
rf_InitNode(&wndNodes[i], rf_wait, RF_TRUE, rf_DiskWriteFunc,
rf_DiskWriteUndoFunc, rf_GenericWakeupFunc, 1, 1, 4, 0,
dag_h, "Wnd", allocList);
RF_ASSERT(pda != NULL);
wndNodes[i].params[0].p = pda;
wndNodes[i].params[1].p = pda->bufPtr;
wndNodes[i].params[2].v = parityStripeID;
wndNodes[i].params[3].v =
RF_CREATE_PARAM3(RF_IO_NORMAL_PRIORITY, 0, 0, which_ru);
pda = pda->next;
}
/* Initialize the redundancy node. */
rf_InitNode(xorNode, rf_wait, RF_TRUE, redFunc, rf_NullNodeUndoFunc,
NULL, 1, 1, 2 * (nWndNodes + nRodNodes) + 1, 1, dag_h,
"Xr ", allocList);
xorNode->flags |= RF_DAGNODE_FLAG_YIELD;
for (i = 0; i < nWndNodes; i++) {
/* pda */
xorNode->params[2 * i + 0] = wndNodes[i].params[0];
/* buf ptr */
xorNode->params[2 * i + 1] = wndNodes[i].params[1];
}
for (i = 0; i < nRodNodes; i++) {
xorNode->params[2 * (nWndNodes + i) + 0] =
rodNodes[i].params[0]; /* pda */
xorNode->params[2 * (nWndNodes + i) + 1] =
rodNodes[i].params[1]; /* buf ptr */
}
/* Xor node needs to get at RAID information. */
xorNode->params[2 * (nWndNodes + nRodNodes)].p = raidPtr;
/*
* Look for an Rod node that reads a complete SU. If none, alloc a
* buffer to receive the parity info. Note that we can't use a new
* data buffer because it will not have gotten written when the xor
* occurs.
*/
for (i = 0; i < nRodNodes; i++)
if (((RF_PhysDiskAddr_t *) rodNodes[i].params[0].p)
->numSector == raidPtr->Layout.sectorsPerStripeUnit)
break;
if (i == nRodNodes) {
RF_CallocAndAdd(xorNode->results[0], 1,
rf_RaidAddressToByte(raidPtr,
raidPtr->Layout.sectorsPerStripeUnit), (void *),
allocList);
} else {
xorNode->results[0] = rodNodes[i].params[1].p;
}
/* Initialize the Lpo node. */
rf_InitNode(lpoNode, rf_wait, RF_FALSE, rf_ParityLogOverwriteFunc,
rf_ParityLogOverwriteUndoFunc, rf_GenericWakeupFunc, 1, 1, 2, 0,
dag_h, "Lpo", allocList);
lpoNode->params[0].p = asmap->parityInfo;
lpoNode->params[1].p = xorNode->results[0];
/* parityInfo must describe entire parity unit. */
RF_ASSERT(asmap->parityInfo->next == NULL);
/* Connect nodes to form graph. */
/* Connect dag header to block node. */
RF_ASSERT(dag_h->numSuccedents == 1);
RF_ASSERT(blockNode->numAntecedents == 0);
dag_h->succedents[0] = blockNode;
/* Connect the block node to the Rod nodes. */
RF_ASSERT(blockNode->numSuccedents == nRodNodes + 1);
for (i = 0; i < nRodNodes; i++) {
RF_ASSERT(rodNodes[i].numAntecedents == 1);
blockNode->succedents[i] = &rodNodes[i];
rodNodes[i].antecedents[0] = blockNode;
rodNodes[i].antType[0] = rf_control;
}
/* Connect the block node to the sync node. */
/* necessary if nRodNodes == 0 */
RF_ASSERT(syncNode->numAntecedents == nRodNodes + 1);
blockNode->succedents[nRodNodes] = syncNode;
syncNode->antecedents[0] = blockNode;
syncNode->antType[0] = rf_control;
/* Connect the Rod nodes to the syncNode. */
for (i = 0; i < nRodNodes; i++) {
rodNodes[i].succedents[0] = syncNode;
syncNode->antecedents[1 + i] = &rodNodes[i];
syncNode->antType[1 + i] = rf_control;
}
/* Connect the sync node to the xor node. */
RF_ASSERT(syncNode->numSuccedents == nWndNodes + 1);
RF_ASSERT(xorNode->numAntecedents == 1);
syncNode->succedents[0] = xorNode;
xorNode->antecedents[0] = syncNode;
xorNode->antType[0] = rf_trueData; /* Carry forward from sync. */
/* Connect the sync node to the Wnd nodes. */
for (i = 0; i < nWndNodes; i++) {
RF_ASSERT(wndNodes->numAntecedents == 1);
syncNode->succedents[1 + i] = &wndNodes[i];
wndNodes[i].antecedents[0] = syncNode;
wndNodes[i].antType[0] = rf_control;
}
/* Connect the xor node to the Lpo node. */
RF_ASSERT(xorNode->numSuccedents == 1);
RF_ASSERT(lpoNode->numAntecedents == 1);
xorNode->succedents[0] = lpoNode;
lpoNode->antecedents[0] = xorNode;
lpoNode->antType[0] = rf_trueData;
/* Connect the Wnd nodes to the unblock node. */
RF_ASSERT(unblockNode->numAntecedents == nWndNodes + 1);
for (i = 0; i < nWndNodes; i++) {
RF_ASSERT(wndNodes->numSuccedents == 1);
wndNodes[i].succedents[0] = unblockNode;
unblockNode->antecedents[i] = &wndNodes[i];
unblockNode->antType[i] = rf_control;
}
/* Connect the Lpo node to the unblock node. */
RF_ASSERT(lpoNode->numSuccedents == 1);
lpoNode->succedents[0] = unblockNode;
unblockNode->antecedents[nWndNodes] = lpoNode;
unblockNode->antType[nWndNodes] = rf_control;
/* Connect unblock node to terminator. */
RF_ASSERT(unblockNode->numSuccedents == 1);
RF_ASSERT(termNode->numAntecedents == 1);
RF_ASSERT(termNode->numSuccedents == 0);
unblockNode->succedents[0] = termNode;
termNode->antecedents[0] = unblockNode;
termNode->antType[0] = rf_control;
}
/*****************************************************************************
*
* Creates a DAG to perform a small-write operation (either raid 5 or pq),
* which is as follows:
*
* Header
* |
* Block
* / | ... \ \
* / | \ \
* Rod Rod Rod Rop
* | \ /| \ / | \/ |
* | | | /\ |
* Wnd Wnd Wnd X
* | \ / |
* | \ / |
* \ \ / Lpo
* \ \ / /
* +-> Unblock <-+
* |
* T
*
*
* R = Read, W = Write, X = Xor, o = old, n = new, d = data, p = parity.
* When the access spans a stripe unit boundary and is less than one SU in
* size, there will be two Rop -- X -- Wnp branches. I call this the
* "double-XOR" case.
* The second output from each Rod node goes to the X node. In the double-XOR
* case, there are exactly 2 Rod nodes, and each sends one output to one X
* node.
* There is one Rod -- Wnd -- T branch for each stripe unit being updated.
*
* The block and unblock nodes are unused. See comment above
* CreateFaultFreeReadDAG.
*
* Note: This DAG ignores all the optimizations related to making the RMWs
* atomic.
* It also has the nasty property that none of the buffers allocated
* for reading old data & parity can be freed until the XOR node fires.
* Need to fix this.
*
* A null qfuncs indicates single fault tolerant.
*****************************************************************************/
void
rf_CommonCreateParityLoggingSmallWriteDAG(RF_Raid_t *raidPtr,
RF_AccessStripeMap_t *asmap, RF_DagHeader_t *dag_h, void *bp,
RF_RaidAccessFlags_t flags, RF_AllocListElem_t *allocList,
RF_RedFuncs_t *pfuncs, RF_RedFuncs_t *qfuncs)
{
RF_DagNode_t *xorNodes, *blockNode, *unblockNode, *nodes;
RF_DagNode_t *readDataNodes, *readParityNodes;
RF_DagNode_t *writeDataNodes, *lpuNodes;
RF_DagNode_t *unlockDataNodes = NULL, *termNode;
RF_PhysDiskAddr_t *pda = asmap->physInfo;
int numDataNodes = asmap->numStripeUnitsAccessed;
int numParityNodes = (asmap->parityInfo->next) ? 2 : 1;
int i, j, nNodes, totalNumNodes;
RF_ReconUnitNum_t which_ru;
int (*func) (RF_DagNode_t * node), (*undoFunc) (RF_DagNode_t * node);
int (*qfunc) (RF_DagNode_t * node);
char*name, *qname;
RF_StripeNum_t parityStripeID =
rf_RaidAddressToParityStripeID(&(raidPtr->Layout),
asmap->raidAddress, &which_ru);
long nfaults = qfuncs ? 2 : 1;
int lu_flag = (rf_enableAtomicRMW) ? 1 : 0; /* Lock/unlock flag. */
if (rf_dagDebug)
printf("[Creating parity-logging small-write DAG]\n");
RF_ASSERT(numDataNodes > 0);
RF_ASSERT(nfaults == 1);
dag_h->creator = "ParityLoggingSmallWriteDAG";
/*
* DAG creation occurs in three steps:
* 1. Count the number of nodes in the DAG.
* 2. Create the nodes.
* 3. Initialize the nodes.
* 4. Connect the nodes.
*/
/* Step 1. Compute number of nodes in the graph. */
/*
* Number of nodes: a read and write for each data unit, a redundancy
* computation node for each parity node, a read and Lpu for each
* parity unit, a block and unblock node (2), a terminator node if
* atomic RMW, an unlock node for each data and redundancy unit.
*/
totalNumNodes = (2 * numDataNodes) + numParityNodes +
(2 * numParityNodes) + 3;
if (lu_flag)
totalNumNodes += numDataNodes;
nNodes = numDataNodes + numParityNodes;
dag_h->numCommitNodes = numDataNodes + numParityNodes;
dag_h->numCommits = 0;
dag_h->numSuccedents = 1;
/* Step 2. Create the nodes. */
RF_CallocAndAdd(nodes, totalNumNodes, sizeof(RF_DagNode_t),
(RF_DagNode_t *), allocList);
i = 0;
blockNode = &nodes[i];
i += 1;
unblockNode = &nodes[i];
i += 1;
readDataNodes = &nodes[i];
i += numDataNodes;
readParityNodes = &nodes[i];
i += numParityNodes;
writeDataNodes = &nodes[i];
i += numDataNodes;
lpuNodes = &nodes[i];
i += numParityNodes;
xorNodes = &nodes[i];
i += numParityNodes;
termNode = &nodes[i];
i += 1;
if (lu_flag) {
unlockDataNodes = &nodes[i];
i += numDataNodes;
}
RF_ASSERT(i == totalNumNodes);
/* Step 3. Initialize the nodes. */
/* Initialize block node (Nil). */
rf_InitNode(blockNode, rf_wait, RF_FALSE, rf_NullNodeFunc,
rf_NullNodeUndoFunc, NULL, nNodes, 0, 0, 0, dag_h,
"Nil", allocList);
/* Initialize unblock node (Nil). */
rf_InitNode(unblockNode, rf_wait, RF_FALSE, rf_NullNodeFunc,
rf_NullNodeUndoFunc, NULL, 1, nNodes, 0, 0, dag_h,
"Nil", allocList);
/* Initialize terminatory node (Trm). */
rf_InitNode(termNode, rf_wait, RF_FALSE, rf_TerminateFunc,
rf_TerminateUndoFunc, NULL, 0, 1, 0, 0, dag_h, "Trm", allocList);
/* Initialize nodes which read old data (Rod). */
for (i = 0; i < numDataNodes; i++) {
rf_InitNode(&readDataNodes[i], rf_wait, RF_FALSE,
rf_DiskReadFunc, rf_DiskReadUndoFunc, rf_GenericWakeupFunc,
nNodes, 1, 4, 0, dag_h, "Rod", allocList);
RF_ASSERT(pda != NULL);
/* Physical disk addr desc. */
readDataNodes[i].params[0].p = pda;
readDataNodes[i].params[1].p = rf_AllocBuffer(raidPtr, dag_h,
pda, allocList); /* Buffer to hold old data. */
readDataNodes[i].params[2].v = parityStripeID;
readDataNodes[i].params[3].v =
RF_CREATE_PARAM3(RF_IO_NORMAL_PRIORITY, lu_flag,
0, which_ru);
pda = pda->next;
readDataNodes[i].propList[0] = NULL;
readDataNodes[i].propList[1] = NULL;
}
/* Initialize nodes which read old parity (Rop). */
pda = asmap->parityInfo;
i = 0;
for (i = 0; i < numParityNodes; i++) {
RF_ASSERT(pda != NULL);
rf_InitNode(&readParityNodes[i], rf_wait, RF_FALSE,
rf_DiskReadFunc, rf_DiskReadUndoFunc, rf_GenericWakeupFunc,
nNodes, 1, 4, 0, dag_h, "Rop", allocList);
readParityNodes[i].params[0].p = pda;
readParityNodes[i].params[1].p = rf_AllocBuffer(raidPtr, dag_h,
pda, allocList); /* Buffer to hold old parity. */
readParityNodes[i].params[2].v = parityStripeID;
readParityNodes[i].params[3].v =
RF_CREATE_PARAM3(RF_IO_NORMAL_PRIORITY, 0, 0, which_ru);
readParityNodes[i].propList[0] = NULL;
pda = pda->next;
}
/* Initialize nodes which write new data (Wnd). */
pda = asmap->physInfo;
for (i = 0; i < numDataNodes; i++) {
RF_ASSERT(pda != NULL);
rf_InitNode(&writeDataNodes[i], rf_wait, RF_TRUE,
rf_DiskWriteFunc, rf_DiskWriteUndoFunc,
rf_GenericWakeupFunc, 1, nNodes, 4, 0, dag_h,
"Wnd", allocList);
/* Physical disk addr desc. */
writeDataNodes[i].params[0].p = pda;
/* Buffer holding new data to be written. */
writeDataNodes[i].params[1].p = pda->bufPtr;
writeDataNodes[i].params[2].v = parityStripeID;
writeDataNodes[i].params[3].v =
RF_CREATE_PARAM3(RF_IO_NORMAL_PRIORITY, 0, 0, which_ru);
if (lu_flag) {
/* Initialize node to unlock the disk queue. */
rf_InitNode(&unlockDataNodes[i], rf_wait, RF_FALSE,
rf_DiskUnlockFunc, rf_DiskUnlockUndoFunc,
rf_GenericWakeupFunc, 1, 1, 2, 0, dag_h,
"Und", allocList);
/* Physical disk addr desc. */
unlockDataNodes[i].params[0].p = pda;
unlockDataNodes[i].params[1].v =
RF_CREATE_PARAM3(RF_IO_NORMAL_PRIORITY, 0,
lu_flag, which_ru);
}
pda = pda->next;
}
/* Initialize nodes which compute new parity. */
/*
* We use the simple XOR func in the double-XOR case, and when we're
* accessing only a portion of one stripe unit. The distinction
* between the two is that the regular XOR func assumes that the
* targbuf is a full SU in size, and examines the pda associated with
* the buffer to decide where within the buffer to XOR the data,
* whereas the simple XOR func just XORs the data into the start of
* the buffer.
*/
if ((numParityNodes == 2) || ((numDataNodes == 1) &&
(asmap->totalSectorsAccessed <
raidPtr->Layout.sectorsPerStripeUnit))) {
func = pfuncs->simple;
undoFunc = rf_NullNodeUndoFunc;
name = pfuncs->SimpleName;
if (qfuncs) {
qfunc = qfuncs->simple;
qname = qfuncs->SimpleName;
}
} else {
func = pfuncs->regular;
undoFunc = rf_NullNodeUndoFunc;
name = pfuncs->RegularName;
if (qfuncs) {
qfunc = qfuncs->regular;
qname = qfuncs->RegularName;
}
}
/*
* Initialize the xor nodes: params are {pda,buf} from {Rod,Wnd,Rop}
* nodes, and raidPtr.
*/
if (numParityNodes == 2) { /* Double-XOR case. */
for (i = 0; i < numParityNodes; i++) {
rf_InitNode(&xorNodes[i], rf_wait, RF_TRUE, func,
undoFunc, NULL, 1, nNodes, 7, 1, dag_h, name,
allocList); /* No wakeup func for XOR. */
xorNodes[i].flags |= RF_DAGNODE_FLAG_YIELD;
xorNodes[i].params[0] = readDataNodes[i].params[0];
xorNodes[i].params[1] = readDataNodes[i].params[1];
xorNodes[i].params[2] = readParityNodes[i].params[0];
xorNodes[i].params[3] = readParityNodes[i].params[1];
xorNodes[i].params[4] = writeDataNodes[i].params[0];
xorNodes[i].params[5] = writeDataNodes[i].params[1];
xorNodes[i].params[6].p = raidPtr;
/* Use old parity buf as target buf. */
xorNodes[i].results[0] = readParityNodes[i].params[1].p;
}
} else {
/* There is only one xor node in this case. */
rf_InitNode(&xorNodes[0], rf_wait, RF_TRUE, func, undoFunc,
NULL, 1, nNodes,
(2 * (numDataNodes + numDataNodes + 1) + 1), 1,
dag_h, name, allocList);
xorNodes[0].flags |= RF_DAGNODE_FLAG_YIELD;
for (i = 0; i < numDataNodes + 1; i++) {
/* Set up params related to Rod and Rop nodes. */
xorNodes[0].params[2 * i + 0] =
readDataNodes[i].params[0]; /* pda */
xorNodes[0].params[2 * i + 1] =
readDataNodes[i].params[1]; /* Buffer pointer */
}
for (i = 0; i < numDataNodes; i++) {
/* Set up params related to Wnd and Wnp nodes. */
xorNodes[0].params[2 * (numDataNodes + 1 + i) + 0] =
writeDataNodes[i].params[0]; /* pda */
xorNodes[0].params[2 * (numDataNodes + 1 + i) + 1] =
writeDataNodes[i].params[1]; /* Buffer pointer */
}
xorNodes[0].params[2 * (numDataNodes + numDataNodes + 1)].p =
raidPtr; /* Xor node needs to get at RAID information. */
xorNodes[0].results[0] = readParityNodes[0].params[1].p;
}
/* Initialize the log node(s). */
pda = asmap->parityInfo;
for (i = 0; i < numParityNodes; i++) {
RF_ASSERT(pda);
rf_InitNode(&lpuNodes[i], rf_wait, RF_FALSE,
rf_ParityLogUpdateFunc, rf_ParityLogUpdateUndoFunc,
rf_GenericWakeupFunc, 1, 1, 2, 0, dag_h, "Lpu", allocList);
lpuNodes[i].params[0].p = pda; /* PhysDiskAddr of parity. */
/* Buffer pointer to parity. */
lpuNodes[i].params[1].p = xorNodes[i].results[0];
pda = pda->next;
}
/* Step 4. Connect the nodes. */
/* Connect header to block node. */
RF_ASSERT(dag_h->numSuccedents == 1);
RF_ASSERT(blockNode->numAntecedents == 0);
dag_h->succedents[0] = blockNode;
/* Connect block node to read old data nodes. */
RF_ASSERT(blockNode->numSuccedents == (numDataNodes + numParityNodes));
for (i = 0; i < numDataNodes; i++) {
blockNode->succedents[i] = &readDataNodes[i];
RF_ASSERT(readDataNodes[i].numAntecedents == 1);
readDataNodes[i].antecedents[0] = blockNode;
readDataNodes[i].antType[0] = rf_control;
}
/* Connect block node to read old parity nodes. */
for (i = 0; i < numParityNodes; i++) {
blockNode->succedents[numDataNodes + i] = &readParityNodes[i];
RF_ASSERT(readParityNodes[i].numAntecedents == 1);
readParityNodes[i].antecedents[0] = blockNode;
readParityNodes[i].antType[0] = rf_control;
}
/* Connect read old data nodes to write new data nodes. */
for (i = 0; i < numDataNodes; i++) {
RF_ASSERT(readDataNodes[i].numSuccedents ==
numDataNodes + numParityNodes);
for (j = 0; j < numDataNodes; j++) {
RF_ASSERT(writeDataNodes[j].numAntecedents ==
numDataNodes + numParityNodes);
readDataNodes[i].succedents[j] = &writeDataNodes[j];
writeDataNodes[j].antecedents[i] = &readDataNodes[i];
if (i == j)
writeDataNodes[j].antType[i] = rf_antiData;
else
writeDataNodes[j].antType[i] = rf_control;
}
}
/* Connect read old data nodes to xor nodes. */
for (i = 0; i < numDataNodes; i++)
for (j = 0; j < numParityNodes; j++) {
RF_ASSERT(xorNodes[j].numAntecedents ==
numDataNodes + numParityNodes);
readDataNodes[i].succedents[numDataNodes + j] =
&xorNodes[j];
xorNodes[j].antecedents[i] = &readDataNodes[i];
xorNodes[j].antType[i] = rf_trueData;
}
/* Connect read old parity nodes to write new data nodes. */
for (i = 0; i < numParityNodes; i++) {
RF_ASSERT(readParityNodes[i].numSuccedents ==
numDataNodes + numParityNodes);
for (j = 0; j < numDataNodes; j++) {
readParityNodes[i].succedents[j] = &writeDataNodes[j];
writeDataNodes[j].antecedents[numDataNodes + i] =
&readParityNodes[i];
writeDataNodes[j].antType[numDataNodes + i] =
rf_control;
}
}
/* Connect read old parity nodes to xor nodes. */
for (i = 0; i < numParityNodes; i++)
for (j = 0; j < numParityNodes; j++) {
readParityNodes[i].succedents[numDataNodes + j] =
&xorNodes[j];
xorNodes[j].antecedents[numDataNodes + i] =
&readParityNodes[i];
xorNodes[j].antType[numDataNodes + i] = rf_trueData;
}
/* Connect xor nodes to write new parity nodes. */
for (i = 0; i < numParityNodes; i++) {
RF_ASSERT(xorNodes[i].numSuccedents == 1);
RF_ASSERT(lpuNodes[i].numAntecedents == 1);
xorNodes[i].succedents[0] = &lpuNodes[i];
lpuNodes[i].antecedents[0] = &xorNodes[i];
lpuNodes[i].antType[0] = rf_trueData;
}
for (i = 0; i < numDataNodes; i++) {
if (lu_flag) {
/* Connect write new data nodes to unlock nodes. */
RF_ASSERT(writeDataNodes[i].numSuccedents == 1);
RF_ASSERT(unlockDataNodes[i].numAntecedents == 1);
writeDataNodes[i].succedents[0] = &unlockDataNodes[i];
unlockDataNodes[i].antecedents[0] = &writeDataNodes[i];
unlockDataNodes[i].antType[0] = rf_control;
/* Connect unlock nodes to unblock node. */
RF_ASSERT(unlockDataNodes[i].numSuccedents == 1);
RF_ASSERT(unblockNode->numAntecedents ==
(numDataNodes + (nfaults * numParityNodes)));
unlockDataNodes[i].succedents[0] = unblockNode;
unblockNode->antecedents[i] = &unlockDataNodes[i];
unblockNode->antType[i] = rf_control;
} else {
/* Connect write new data nodes to unblock node. */
RF_ASSERT(writeDataNodes[i].numSuccedents == 1);
RF_ASSERT(unblockNode->numAntecedents ==
(numDataNodes + (nfaults * numParityNodes)));
writeDataNodes[i].succedents[0] = unblockNode;
unblockNode->antecedents[i] = &writeDataNodes[i];
unblockNode->antType[i] = rf_control;
}
}
/* Connect write new parity nodes to unblock node. */
for (i = 0; i < numParityNodes; i++) {
RF_ASSERT(lpuNodes[i].numSuccedents == 1);
lpuNodes[i].succedents[0] = unblockNode;
unblockNode->antecedents[numDataNodes + i] = &lpuNodes[i];
unblockNode->antType[numDataNodes + i] = rf_control;
}
/* Connect unblock node to terminator. */
RF_ASSERT(unblockNode->numSuccedents == 1);
RF_ASSERT(termNode->numAntecedents == 1);
RF_ASSERT(termNode->numSuccedents == 0);
unblockNode->succedents[0] = termNode;
termNode->antecedents[0] = unblockNode;
termNode->antType[0] = rf_control;
}
void
rf_CreateParityLoggingSmallWriteDAG(RF_Raid_t *raidPtr,
RF_AccessStripeMap_t *asmap, RF_DagHeader_t *dag_h, void *bp,
RF_RaidAccessFlags_t flags, RF_AllocListElem_t *allocList,
RF_RedFuncs_t *pfuncs, RF_RedFuncs_t *qfuncs)
{
dag_h->creator = "ParityLoggingSmallWriteDAG";
rf_CommonCreateParityLoggingSmallWriteDAG(raidPtr, asmap, dag_h, bp,
flags, allocList, &rf_xorFuncs, NULL);
}
void
rf_CreateParityLoggingLargeWriteDAG(RF_Raid_t *raidPtr,
RF_AccessStripeMap_t *asmap, RF_DagHeader_t *dag_h, void *bp,
RF_RaidAccessFlags_t flags, RF_AllocListElem_t *allocList, int nfaults,
int (*redFunc) (RF_DagNode_t *))
{
dag_h->creator = "ParityLoggingSmallWriteDAG";
rf_CommonCreateParityLoggingLargeWriteDAG(raidPtr, asmap, dag_h, bp,
flags, allocList, 1, rf_RegularXorFunc);
}
#endif /* RF_INCLUDE_PARITYLOGGING > 0 */
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