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Diffstat (limited to 'sys/dev/raidframe/rf_parityloggingdags.c')
| -rw-r--r-- | sys/dev/raidframe/rf_parityloggingdags.c | 673 |
1 files changed, 673 insertions, 0 deletions
diff --git a/sys/dev/raidframe/rf_parityloggingdags.c b/sys/dev/raidframe/rf_parityloggingdags.c new file mode 100644 index 0000000..7ccef55 --- /dev/null +++ b/sys/dev/raidframe/rf_parityloggingdags.c @@ -0,0 +1,673 @@ +/* $FreeBSD$ */ +/* $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 <dev/raidframe/rf_archs.h> + +#if RF_INCLUDE_PARITYLOGGING > 0 + +/* + DAGs specific to parity logging are created here + */ + +#include <dev/raidframe/rf_types.h> +#include <dev/raidframe/rf_raid.h> +#include <dev/raidframe/rf_dag.h> +#include <dev/raidframe/rf_dagutils.h> +#include <dev/raidframe/rf_dagfuncs.h> +#include <dev/raidframe/rf_debugMem.h> +#include <dev/raidframe/rf_paritylog.h> +#include <dev/raidframe/rf_memchunk.h> +#include <dev/raidframe/rf_general.h> + +#include <dev/raidframe/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, + *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++) { + xorNode->params[2 * i + 0] = wndNodes[i].params[0]; /* pda */ + xorNode->params[2 * i + 1] = wndNodes[i].params[1]; /* buf ptr */ + } + 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 */ + } + xorNode->params[2 * (nWndNodes + nRodNodes)].p = raidPtr; /* xor node needs to get + * at RAID information */ + + /* 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]; + RF_ASSERT(asmap->parityInfo->next == NULL); /* parityInfo must + * describe entire + * parity unit */ + + /* 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 unit, 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); + readDataNodes[i].params[0].p = pda; /* physical disk addr + * desc */ + 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); + writeDataNodes[i].params[0].p = pda; /* physical disk addr + * desc */ + writeDataNodes[i].params[1].p = pda->bufPtr; /* buffer holding new + * data to be written */ + 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); + unlockDataNodes[i].params[0].p = pda; /* physical disk addr + * desc */ + 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; + xorNodes[i].results[0] = readParityNodes[i].params[1].p; /* use old parity buf as + * target buf */ + } + } 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 */ + lpuNodes[i].params[1].p = xorNodes[i].results[0]; /* buffer pointer to + * parity */ + 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 */ |
