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NetBSD/sys/dev/raidframe/rf_parityloggingdags.c
oster 38a3987b69 RAIDframe, version 1.1, from the Parallel Data Laboratory at 
Carnegie Mellon University.  Full RAID implementation, including
levels 0, 1, 4, 5, 6, parity logging, and a few other goodies.
Ported to NetBSD by Greg Oster.
1998-11-13 04:20:26 +00:00

752 lines
30 KiB
C
Raw Blame History

/* $NetBSD: rf_parityloggingdags.c,v 1.1 1998/11/13 04:20:32 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.
*/
/*
* Log: rf_parityloggingdags.c,v
* Revision 1.27 1996/07/28 20:31:39 jimz
* i386netbsd port
* true/false fixup
*
* Revision 1.26 1996/07/27 23:36:08 jimz
* Solaris port of simulator
*
* Revision 1.25 1996/07/22 19:52:16 jimz
* switched node params to RF_DagParam_t, a union of
* a 64-bit int and a void *, for better portability
* attempted hpux port, but failed partway through for
* lack of a single C compiler capable of compiling all
* source files
*
* Revision 1.24 1996/06/11 13:47:21 jimz
* fix up for in-kernel compilation
*
* Revision 1.23 1996/06/07 22:26:27 jimz
* type-ify which_ru (RF_ReconUnitNum_t)
*
* Revision 1.22 1996/06/07 21:33:04 jimz
* begin using consistent types for sector numbers,
* stripe numbers, row+col numbers, recon unit numbers
*
* Revision 1.21 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 1.20 1996/05/31 22:26:54 jimz
* fix a lot of mapping problems, memory allocation problems
* found some weird lock issues, fixed 'em
* more code cleanup
*
* Revision 1.19 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 1.18 1996/05/27 18:56:37 jimz
* more code cleanup
* better typing
* compiles in all 3 environments
*
* Revision 1.17 1996/05/24 22:17:04 jimz
* continue code + namespace cleanup
* typed a bunch of flags
*
* Revision 1.16 1996/05/24 04:28:55 jimz
* release cleanup ckpt
*
* Revision 1.15 1996/05/23 21:46:35 jimz
* checkpoint in code cleanup (release prep)
* lots of types, function names have been fixed
*
* Revision 1.14 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 1.13 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 1.12 1996/05/08 21:01:24 jimz
* fixed up enum type names that were conflicting with other
* enums and function names (ie, "panic")
* future naming trends will be towards RF_ and rf_ for
* everything raidframe-related
*
* Revision 1.11 1996/05/03 19:42:02 wvcii
* added includes for dag library
*
* Revision 1.10 1995/12/12 18:10:06 jimz
* MIN -> RF_MIN, MAX -> RF_MAX, ASSERT -> RF_ASSERT
* fix 80-column brain damage in comments
*
* Revision 1.9 1995/12/06 20:55:24 wvcii
* added prototyping
* fixed bug in dag header numSuccedents count for both small and large dags
*
* Revision 1.8 1995/11/30 16:08:01 wvcii
* added copyright info
*
* Revision 1.7 1995/11/07 15:29:05 wvcii
* reorganized code, adding comments and asserts
* dag creation routines now generate term node
* encoded commit point, barrier, and antecedence types into dags
*
* Revision 1.6 1995/09/07 15:52:06 jimz
* noop compile when INCLUDE_PARITYLOGGING not defined
*
* Revision 1.5 1995/06/15 13:51:53 robby
* updated some wrong prototypes (after prototyping rf_dagutils.h)
*
* Revision 1.4 1995/06/09 13:15:05 wvcii
* code is now nonblocking
*
* Revision 1.3 95/05/31 13:09:14 wvcii
* code debug
*
* Revision 1.2 1995/05/21 15:34:14 wvcii
* code debug
*
* Revision 1.1 95/05/16 14:36:53 wvcii
* Initial revision
*
*
*/
#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_threadid.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, *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 */
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