1 /* $NetBSD: rf_parityloggingdags.c,v 1.6 2001/10/04 15:58:55 oster Exp $ */ 2 /* 3 * Copyright (c) 1995 Carnegie-Mellon University. 4 * All rights reserved. 5 * 6 * Author: William V. Courtright II 7 * 8 * Permission to use, copy, modify and distribute this software and 9 * its documentation is hereby granted, provided that both the copyright 10 * notice and this permission notice appear in all copies of the 11 * software, derivative works or modified versions, and any portions 12 * thereof, and that both notices appear in supporting documentation. 13 * 14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 16 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 17 * 18 * Carnegie Mellon requests users of this software to return to 19 * 20 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 21 * School of Computer Science 22 * Carnegie Mellon University 23 * Pittsburgh PA 15213-3890 24 * 25 * any improvements or extensions that they make and grant Carnegie the 26 * rights to redistribute these changes. 27 */ 28 29 #include "rf_archs.h" 30 31 #if RF_INCLUDE_PARITYLOGGING > 0 32 33 /* 34 DAGs specific to parity logging are created here 35 */ 36 37 #include <dev/raidframe/raidframevar.h> 38 39 #include "rf_raid.h" 40 #include "rf_dag.h" 41 #include "rf_dagutils.h" 42 #include "rf_dagfuncs.h" 43 #include "rf_debugMem.h" 44 #include "rf_paritylog.h" 45 #include "rf_memchunk.h" 46 #include "rf_general.h" 47 48 #include "rf_parityloggingdags.h" 49 50 /****************************************************************************** 51 * 52 * creates a DAG to perform a large-write operation: 53 * 54 * / Rod \ / Wnd \ 55 * H -- NIL- Rod - NIL - Wnd ------ NIL - T 56 * \ Rod / \ Xor - Lpo / 57 * 58 * The writes are not done until the reads complete because if they were done in 59 * parallel, a failure on one of the reads could leave the parity in an inconsistent 60 * state, so that the retry with a new DAG would produce erroneous parity. 61 * 62 * Note: this DAG has the nasty property that none of the buffers allocated for reading 63 * old data can be freed until the XOR node fires. Need to fix this. 64 * 65 * The last two arguments are the number of faults tolerated, and function for the 66 * redundancy calculation. The undo for the redundancy calc is assumed to be null 67 * 68 *****************************************************************************/ 69 70 void 71 rf_CommonCreateParityLoggingLargeWriteDAG( 72 RF_Raid_t * raidPtr, 73 RF_AccessStripeMap_t * asmap, 74 RF_DagHeader_t * dag_h, 75 void *bp, 76 RF_RaidAccessFlags_t flags, 77 RF_AllocListElem_t * allocList, 78 int nfaults, 79 int (*redFunc) (RF_DagNode_t *)) 80 { 81 RF_DagNode_t *nodes, *wndNodes, *rodNodes = NULL, *syncNode, *xorNode, 82 *lpoNode, *blockNode, *unblockNode, *termNode; 83 int nWndNodes, nRodNodes, i; 84 RF_RaidLayout_t *layoutPtr = &(raidPtr->Layout); 85 RF_AccessStripeMapHeader_t *new_asm_h[2]; 86 int nodeNum, asmNum; 87 RF_ReconUnitNum_t which_ru; 88 char *sosBuffer, *eosBuffer; 89 RF_PhysDiskAddr_t *pda; 90 RF_StripeNum_t parityStripeID = rf_RaidAddressToParityStripeID(&(raidPtr->Layout), asmap->raidAddress, &which_ru); 91 92 if (rf_dagDebug) 93 printf("[Creating parity-logging large-write DAG]\n"); 94 RF_ASSERT(nfaults == 1);/* this arch only single fault tolerant */ 95 dag_h->creator = "ParityLoggingLargeWriteDAG"; 96 97 /* alloc the Wnd nodes, the xor node, and the Lpo node */ 98 nWndNodes = asmap->numStripeUnitsAccessed; 99 RF_CallocAndAdd(nodes, nWndNodes + 6, sizeof(RF_DagNode_t), (RF_DagNode_t *), allocList); 100 i = 0; 101 wndNodes = &nodes[i]; 102 i += nWndNodes; 103 xorNode = &nodes[i]; 104 i += 1; 105 lpoNode = &nodes[i]; 106 i += 1; 107 blockNode = &nodes[i]; 108 i += 1; 109 syncNode = &nodes[i]; 110 i += 1; 111 unblockNode = &nodes[i]; 112 i += 1; 113 termNode = &nodes[i]; 114 i += 1; 115 116 dag_h->numCommitNodes = nWndNodes + 1; 117 dag_h->numCommits = 0; 118 dag_h->numSuccedents = 1; 119 120 rf_MapUnaccessedPortionOfStripe(raidPtr, layoutPtr, asmap, dag_h, new_asm_h, &nRodNodes, &sosBuffer, &eosBuffer, allocList); 121 if (nRodNodes > 0) 122 RF_CallocAndAdd(rodNodes, nRodNodes, sizeof(RF_DagNode_t), (RF_DagNode_t *), allocList); 123 124 /* begin node initialization */ 125 rf_InitNode(blockNode, rf_wait, RF_FALSE, rf_NullNodeFunc, rf_NullNodeUndoFunc, NULL, nRodNodes + 1, 0, 0, 0, dag_h, "Nil", allocList); 126 rf_InitNode(unblockNode, rf_wait, RF_FALSE, rf_NullNodeFunc, rf_NullNodeUndoFunc, NULL, 1, nWndNodes + 1, 0, 0, dag_h, "Nil", allocList); 127 rf_InitNode(syncNode, rf_wait, RF_FALSE, rf_NullNodeFunc, rf_NullNodeUndoFunc, NULL, nWndNodes + 1, nRodNodes + 1, 0, 0, dag_h, "Nil", allocList); 128 rf_InitNode(termNode, rf_wait, RF_FALSE, rf_TerminateFunc, rf_TerminateUndoFunc, NULL, 0, 1, 0, 0, dag_h, "Trm", allocList); 129 130 /* initialize the Rod nodes */ 131 for (nodeNum = asmNum = 0; asmNum < 2; asmNum++) { 132 if (new_asm_h[asmNum]) { 133 pda = new_asm_h[asmNum]->stripeMap->physInfo; 134 while (pda) { 135 rf_InitNode(&rodNodes[nodeNum], rf_wait, RF_FALSE, rf_DiskReadFunc, rf_DiskReadUndoFunc, rf_GenericWakeupFunc, 1, 1, 4, 0, dag_h, "Rod", allocList); 136 rodNodes[nodeNum].params[0].p = pda; 137 rodNodes[nodeNum].params[1].p = pda->bufPtr; 138 rodNodes[nodeNum].params[2].v = parityStripeID; 139 rodNodes[nodeNum].params[3].v = RF_CREATE_PARAM3(RF_IO_NORMAL_PRIORITY, 0, 0, which_ru); 140 nodeNum++; 141 pda = pda->next; 142 } 143 } 144 } 145 RF_ASSERT(nodeNum == nRodNodes); 146 147 /* initialize the wnd nodes */ 148 pda = asmap->physInfo; 149 for (i = 0; i < nWndNodes; i++) { 150 rf_InitNode(&wndNodes[i], rf_wait, RF_TRUE, rf_DiskWriteFunc, rf_DiskWriteUndoFunc, rf_GenericWakeupFunc, 1, 1, 4, 0, dag_h, "Wnd", allocList); 151 RF_ASSERT(pda != NULL); 152 wndNodes[i].params[0].p = pda; 153 wndNodes[i].params[1].p = pda->bufPtr; 154 wndNodes[i].params[2].v = parityStripeID; 155 wndNodes[i].params[3].v = RF_CREATE_PARAM3(RF_IO_NORMAL_PRIORITY, 0, 0, which_ru); 156 pda = pda->next; 157 } 158 159 /* initialize the redundancy node */ 160 rf_InitNode(xorNode, rf_wait, RF_TRUE, redFunc, rf_NullNodeUndoFunc, NULL, 1, 1, 2 * (nWndNodes + nRodNodes) + 1, 1, dag_h, "Xr ", allocList); 161 xorNode->flags |= RF_DAGNODE_FLAG_YIELD; 162 for (i = 0; i < nWndNodes; i++) { 163 xorNode->params[2 * i + 0] = wndNodes[i].params[0]; /* pda */ 164 xorNode->params[2 * i + 1] = wndNodes[i].params[1]; /* buf ptr */ 165 } 166 for (i = 0; i < nRodNodes; i++) { 167 xorNode->params[2 * (nWndNodes + i) + 0] = rodNodes[i].params[0]; /* pda */ 168 xorNode->params[2 * (nWndNodes + i) + 1] = rodNodes[i].params[1]; /* buf ptr */ 169 } 170 xorNode->params[2 * (nWndNodes + nRodNodes)].p = raidPtr; /* xor node needs to get 171 * at RAID information */ 172 173 /* look for an Rod node that reads a complete SU. If none, alloc a 174 * buffer to receive the parity info. Note that we can't use a new 175 * data buffer because it will not have gotten written when the xor 176 * occurs. */ 177 for (i = 0; i < nRodNodes; i++) 178 if (((RF_PhysDiskAddr_t *) rodNodes[i].params[0].p)->numSector == raidPtr->Layout.sectorsPerStripeUnit) 179 break; 180 if (i == nRodNodes) { 181 RF_CallocAndAdd(xorNode->results[0], 1, rf_RaidAddressToByte(raidPtr, raidPtr->Layout.sectorsPerStripeUnit), (void *), allocList); 182 } else { 183 xorNode->results[0] = rodNodes[i].params[1].p; 184 } 185 186 /* initialize the Lpo node */ 187 rf_InitNode(lpoNode, rf_wait, RF_FALSE, rf_ParityLogOverwriteFunc, rf_ParityLogOverwriteUndoFunc, rf_GenericWakeupFunc, 1, 1, 2, 0, dag_h, "Lpo", allocList); 188 189 lpoNode->params[0].p = asmap->parityInfo; 190 lpoNode->params[1].p = xorNode->results[0]; 191 RF_ASSERT(asmap->parityInfo->next == NULL); /* parityInfo must 192 * describe entire 193 * parity unit */ 194 195 /* connect nodes to form graph */ 196 197 /* connect dag header to block node */ 198 RF_ASSERT(dag_h->numSuccedents == 1); 199 RF_ASSERT(blockNode->numAntecedents == 0); 200 dag_h->succedents[0] = blockNode; 201 202 /* connect the block node to the Rod nodes */ 203 RF_ASSERT(blockNode->numSuccedents == nRodNodes + 1); 204 for (i = 0; i < nRodNodes; i++) { 205 RF_ASSERT(rodNodes[i].numAntecedents == 1); 206 blockNode->succedents[i] = &rodNodes[i]; 207 rodNodes[i].antecedents[0] = blockNode; 208 rodNodes[i].antType[0] = rf_control; 209 } 210 211 /* connect the block node to the sync node */ 212 /* necessary if nRodNodes == 0 */ 213 RF_ASSERT(syncNode->numAntecedents == nRodNodes + 1); 214 blockNode->succedents[nRodNodes] = syncNode; 215 syncNode->antecedents[0] = blockNode; 216 syncNode->antType[0] = rf_control; 217 218 /* connect the Rod nodes to the syncNode */ 219 for (i = 0; i < nRodNodes; i++) { 220 rodNodes[i].succedents[0] = syncNode; 221 syncNode->antecedents[1 + i] = &rodNodes[i]; 222 syncNode->antType[1 + i] = rf_control; 223 } 224 225 /* connect the sync node to the xor node */ 226 RF_ASSERT(syncNode->numSuccedents == nWndNodes + 1); 227 RF_ASSERT(xorNode->numAntecedents == 1); 228 syncNode->succedents[0] = xorNode; 229 xorNode->antecedents[0] = syncNode; 230 xorNode->antType[0] = rf_trueData; /* carry forward from sync */ 231 232 /* connect the sync node to the Wnd nodes */ 233 for (i = 0; i < nWndNodes; i++) { 234 RF_ASSERT(wndNodes->numAntecedents == 1); 235 syncNode->succedents[1 + i] = &wndNodes[i]; 236 wndNodes[i].antecedents[0] = syncNode; 237 wndNodes[i].antType[0] = rf_control; 238 } 239 240 /* connect the xor node to the Lpo node */ 241 RF_ASSERT(xorNode->numSuccedents == 1); 242 RF_ASSERT(lpoNode->numAntecedents == 1); 243 xorNode->succedents[0] = lpoNode; 244 lpoNode->antecedents[0] = xorNode; 245 lpoNode->antType[0] = rf_trueData; 246 247 /* connect the Wnd nodes to the unblock node */ 248 RF_ASSERT(unblockNode->numAntecedents == nWndNodes + 1); 249 for (i = 0; i < nWndNodes; i++) { 250 RF_ASSERT(wndNodes->numSuccedents == 1); 251 wndNodes[i].succedents[0] = unblockNode; 252 unblockNode->antecedents[i] = &wndNodes[i]; 253 unblockNode->antType[i] = rf_control; 254 } 255 256 /* connect the Lpo node to the unblock node */ 257 RF_ASSERT(lpoNode->numSuccedents == 1); 258 lpoNode->succedents[0] = unblockNode; 259 unblockNode->antecedents[nWndNodes] = lpoNode; 260 unblockNode->antType[nWndNodes] = rf_control; 261 262 /* connect unblock node to terminator */ 263 RF_ASSERT(unblockNode->numSuccedents == 1); 264 RF_ASSERT(termNode->numAntecedents == 1); 265 RF_ASSERT(termNode->numSuccedents == 0); 266 unblockNode->succedents[0] = termNode; 267 termNode->antecedents[0] = unblockNode; 268 termNode->antType[0] = rf_control; 269 } 270 271 272 273 274 /****************************************************************************** 275 * 276 * creates a DAG to perform a small-write operation (either raid 5 or pq), which is as follows: 277 * 278 * Header 279 * | 280 * Block 281 * / | ... \ \ 282 * / | \ \ 283 * Rod Rod Rod Rop 284 * | \ /| \ / | \/ | 285 * | | | /\ | 286 * Wnd Wnd Wnd X 287 * | \ / | 288 * | \ / | 289 * \ \ / Lpo 290 * \ \ / / 291 * +-> Unblock <-+ 292 * | 293 * T 294 * 295 * 296 * R = Read, W = Write, X = Xor, o = old, n = new, d = data, p = parity. 297 * When the access spans a stripe unit boundary and is less than one SU in size, there will 298 * be two Rop -- X -- Wnp branches. I call this the "double-XOR" case. 299 * The second output from each Rod node goes to the X node. In the double-XOR 300 * case, there are exactly 2 Rod nodes, and each sends one output to one X node. 301 * There is one Rod -- Wnd -- T branch for each stripe unit being updated. 302 * 303 * The block and unblock nodes are unused. See comment above CreateFaultFreeReadDAG. 304 * 305 * Note: this DAG ignores all the optimizations related to making the RMWs atomic. 306 * it also has the nasty property that none of the buffers allocated for reading 307 * old data & parity can be freed until the XOR node fires. Need to fix this. 308 * 309 * A null qfuncs indicates single fault tolerant 310 *****************************************************************************/ 311 312 void 313 rf_CommonCreateParityLoggingSmallWriteDAG( 314 RF_Raid_t * raidPtr, 315 RF_AccessStripeMap_t * asmap, 316 RF_DagHeader_t * dag_h, 317 void *bp, 318 RF_RaidAccessFlags_t flags, 319 RF_AllocListElem_t * allocList, 320 RF_RedFuncs_t * pfuncs, 321 RF_RedFuncs_t * qfuncs) 322 { 323 RF_DagNode_t *xorNodes, *blockNode, *unblockNode, *nodes; 324 RF_DagNode_t *readDataNodes, *readParityNodes; 325 RF_DagNode_t *writeDataNodes, *lpuNodes; 326 RF_DagNode_t *unlockDataNodes = NULL, *termNode; 327 RF_PhysDiskAddr_t *pda = asmap->physInfo; 328 int numDataNodes = asmap->numStripeUnitsAccessed; 329 int numParityNodes = (asmap->parityInfo->next) ? 2 : 1; 330 int i, j, nNodes, totalNumNodes; 331 RF_ReconUnitNum_t which_ru; 332 int (*func) (RF_DagNode_t * node), (*undoFunc) (RF_DagNode_t * node); 333 int (*qfunc) (RF_DagNode_t * node); 334 char *name, *qname; 335 RF_StripeNum_t parityStripeID = rf_RaidAddressToParityStripeID(&(raidPtr->Layout), asmap->raidAddress, &which_ru); 336 #ifdef RAID_DIAGNOSTIC 337 long nfaults = qfuncs ? 2 : 1; 338 #endif /* RAID_DIAGNOSTIC */ 339 int lu_flag = (rf_enableAtomicRMW) ? 1 : 0; /* lock/unlock flag */ 340 341 if (rf_dagDebug) 342 printf("[Creating parity-logging small-write DAG]\n"); 343 RF_ASSERT(numDataNodes > 0); 344 RF_ASSERT(nfaults == 1); 345 dag_h->creator = "ParityLoggingSmallWriteDAG"; 346 347 /* DAG creation occurs in three steps: 1. count the number of nodes in 348 * the DAG 2. create the nodes 3. initialize the nodes 4. connect the 349 * nodes */ 350 351 /* Step 1. compute number of nodes in the graph */ 352 353 /* number of nodes: a read and write for each data unit a redundancy 354 * computation node for each parity node a read and Lpu for each 355 * parity unit a block and unblock node (2) a terminator node if 356 * atomic RMW an unlock node for each data unit, redundancy unit */ 357 totalNumNodes = (2 * numDataNodes) + numParityNodes + (2 * numParityNodes) + 3; 358 if (lu_flag) 359 totalNumNodes += numDataNodes; 360 361 nNodes = numDataNodes + numParityNodes; 362 363 dag_h->numCommitNodes = numDataNodes + numParityNodes; 364 dag_h->numCommits = 0; 365 dag_h->numSuccedents = 1; 366 367 /* Step 2. create the nodes */ 368 RF_CallocAndAdd(nodes, totalNumNodes, sizeof(RF_DagNode_t), (RF_DagNode_t *), allocList); 369 i = 0; 370 blockNode = &nodes[i]; 371 i += 1; 372 unblockNode = &nodes[i]; 373 i += 1; 374 readDataNodes = &nodes[i]; 375 i += numDataNodes; 376 readParityNodes = &nodes[i]; 377 i += numParityNodes; 378 writeDataNodes = &nodes[i]; 379 i += numDataNodes; 380 lpuNodes = &nodes[i]; 381 i += numParityNodes; 382 xorNodes = &nodes[i]; 383 i += numParityNodes; 384 termNode = &nodes[i]; 385 i += 1; 386 if (lu_flag) { 387 unlockDataNodes = &nodes[i]; 388 i += numDataNodes; 389 } 390 RF_ASSERT(i == totalNumNodes); 391 392 /* Step 3. initialize the nodes */ 393 /* initialize block node (Nil) */ 394 rf_InitNode(blockNode, rf_wait, RF_FALSE, rf_NullNodeFunc, rf_NullNodeUndoFunc, NULL, nNodes, 0, 0, 0, dag_h, "Nil", allocList); 395 396 /* initialize unblock node (Nil) */ 397 rf_InitNode(unblockNode, rf_wait, RF_FALSE, rf_NullNodeFunc, rf_NullNodeUndoFunc, NULL, 1, nNodes, 0, 0, dag_h, "Nil", allocList); 398 399 /* initialize terminatory node (Trm) */ 400 rf_InitNode(termNode, rf_wait, RF_FALSE, rf_TerminateFunc, rf_TerminateUndoFunc, NULL, 0, 1, 0, 0, dag_h, "Trm", allocList); 401 402 /* initialize nodes which read old data (Rod) */ 403 for (i = 0; i < numDataNodes; i++) { 404 rf_InitNode(&readDataNodes[i], rf_wait, RF_FALSE, rf_DiskReadFunc, rf_DiskReadUndoFunc, rf_GenericWakeupFunc, nNodes, 1, 4, 0, dag_h, "Rod", allocList); 405 RF_ASSERT(pda != NULL); 406 readDataNodes[i].params[0].p = pda; /* physical disk addr 407 * desc */ 408 readDataNodes[i].params[1].p = rf_AllocBuffer(raidPtr, dag_h, pda, allocList); /* buffer to hold old 409 * data */ 410 readDataNodes[i].params[2].v = parityStripeID; 411 readDataNodes[i].params[3].v = RF_CREATE_PARAM3(RF_IO_NORMAL_PRIORITY, lu_flag, 0, which_ru); 412 pda = pda->next; 413 readDataNodes[i].propList[0] = NULL; 414 readDataNodes[i].propList[1] = NULL; 415 } 416 417 /* initialize nodes which read old parity (Rop) */ 418 pda = asmap->parityInfo; 419 i = 0; 420 for (i = 0; i < numParityNodes; i++) { 421 RF_ASSERT(pda != NULL); 422 rf_InitNode(&readParityNodes[i], rf_wait, RF_FALSE, rf_DiskReadFunc, rf_DiskReadUndoFunc, rf_GenericWakeupFunc, nNodes, 1, 4, 0, dag_h, "Rop", allocList); 423 readParityNodes[i].params[0].p = pda; 424 readParityNodes[i].params[1].p = rf_AllocBuffer(raidPtr, dag_h, pda, allocList); /* buffer to hold old 425 * parity */ 426 readParityNodes[i].params[2].v = parityStripeID; 427 readParityNodes[i].params[3].v = RF_CREATE_PARAM3(RF_IO_NORMAL_PRIORITY, 0, 0, which_ru); 428 readParityNodes[i].propList[0] = NULL; 429 pda = pda->next; 430 } 431 432 /* initialize nodes which write new data (Wnd) */ 433 pda = asmap->physInfo; 434 for (i = 0; i < numDataNodes; i++) { 435 RF_ASSERT(pda != NULL); 436 rf_InitNode(&writeDataNodes[i], rf_wait, RF_TRUE, rf_DiskWriteFunc, rf_DiskWriteUndoFunc, rf_GenericWakeupFunc, 1, nNodes, 4, 0, dag_h, "Wnd", allocList); 437 writeDataNodes[i].params[0].p = pda; /* physical disk addr 438 * desc */ 439 writeDataNodes[i].params[1].p = pda->bufPtr; /* buffer holding new 440 * data to be written */ 441 writeDataNodes[i].params[2].v = parityStripeID; 442 writeDataNodes[i].params[3].v = RF_CREATE_PARAM3(RF_IO_NORMAL_PRIORITY, 0, 0, which_ru); 443 444 if (lu_flag) { 445 /* initialize node to unlock the disk queue */ 446 rf_InitNode(&unlockDataNodes[i], rf_wait, RF_FALSE, rf_DiskUnlockFunc, rf_DiskUnlockUndoFunc, rf_GenericWakeupFunc, 1, 1, 2, 0, dag_h, "Und", allocList); 447 unlockDataNodes[i].params[0].p = pda; /* physical disk addr 448 * desc */ 449 unlockDataNodes[i].params[1].v = RF_CREATE_PARAM3(RF_IO_NORMAL_PRIORITY, 0, lu_flag, which_ru); 450 } 451 pda = pda->next; 452 } 453 454 455 /* initialize nodes which compute new parity */ 456 /* we use the simple XOR func in the double-XOR case, and when we're 457 * accessing only a portion of one stripe unit. the distinction 458 * between the two is that the regular XOR func assumes that the 459 * targbuf is a full SU in size, and examines the pda associated with 460 * the buffer to decide where within the buffer to XOR the data, 461 * whereas the simple XOR func just XORs the data into the start of 462 * the buffer. */ 463 if ((numParityNodes == 2) || ((numDataNodes == 1) && (asmap->totalSectorsAccessed < raidPtr->Layout.sectorsPerStripeUnit))) { 464 func = pfuncs->simple; 465 undoFunc = rf_NullNodeUndoFunc; 466 name = pfuncs->SimpleName; 467 if (qfuncs) { 468 qfunc = qfuncs->simple; 469 qname = qfuncs->SimpleName; 470 } 471 } else { 472 func = pfuncs->regular; 473 undoFunc = rf_NullNodeUndoFunc; 474 name = pfuncs->RegularName; 475 if (qfuncs) { 476 qfunc = qfuncs->regular; 477 qname = qfuncs->RegularName; 478 } 479 } 480 /* initialize the xor nodes: params are {pda,buf} from {Rod,Wnd,Rop} 481 * nodes, and raidPtr */ 482 if (numParityNodes == 2) { /* double-xor case */ 483 for (i = 0; i < numParityNodes; i++) { 484 rf_InitNode(&xorNodes[i], rf_wait, RF_TRUE, func, undoFunc, NULL, 1, nNodes, 7, 1, dag_h, name, allocList); /* no wakeup func for 485 * xor */ 486 xorNodes[i].flags |= RF_DAGNODE_FLAG_YIELD; 487 xorNodes[i].params[0] = readDataNodes[i].params[0]; 488 xorNodes[i].params[1] = readDataNodes[i].params[1]; 489 xorNodes[i].params[2] = readParityNodes[i].params[0]; 490 xorNodes[i].params[3] = readParityNodes[i].params[1]; 491 xorNodes[i].params[4] = writeDataNodes[i].params[0]; 492 xorNodes[i].params[5] = writeDataNodes[i].params[1]; 493 xorNodes[i].params[6].p = raidPtr; 494 xorNodes[i].results[0] = readParityNodes[i].params[1].p; /* use old parity buf as 495 * target buf */ 496 } 497 } else { 498 /* there is only one xor node in this case */ 499 rf_InitNode(&xorNodes[0], rf_wait, RF_TRUE, func, undoFunc, NULL, 1, nNodes, (2 * (numDataNodes + numDataNodes + 1) + 1), 1, dag_h, name, allocList); 500 xorNodes[0].flags |= RF_DAGNODE_FLAG_YIELD; 501 for (i = 0; i < numDataNodes + 1; i++) { 502 /* set up params related to Rod and Rop nodes */ 503 xorNodes[0].params[2 * i + 0] = readDataNodes[i].params[0]; /* pda */ 504 xorNodes[0].params[2 * i + 1] = readDataNodes[i].params[1]; /* buffer pointer */ 505 } 506 for (i = 0; i < numDataNodes; i++) { 507 /* set up params related to Wnd and Wnp nodes */ 508 xorNodes[0].params[2 * (numDataNodes + 1 + i) + 0] = writeDataNodes[i].params[0]; /* pda */ 509 xorNodes[0].params[2 * (numDataNodes + 1 + i) + 1] = writeDataNodes[i].params[1]; /* buffer pointer */ 510 } 511 xorNodes[0].params[2 * (numDataNodes + numDataNodes + 1)].p = raidPtr; /* xor node needs to get 512 * at RAID information */ 513 xorNodes[0].results[0] = readParityNodes[0].params[1].p; 514 } 515 516 /* initialize the log node(s) */ 517 pda = asmap->parityInfo; 518 for (i = 0; i < numParityNodes; i++) { 519 RF_ASSERT(pda); 520 rf_InitNode(&lpuNodes[i], rf_wait, RF_FALSE, rf_ParityLogUpdateFunc, rf_ParityLogUpdateUndoFunc, rf_GenericWakeupFunc, 1, 1, 2, 0, dag_h, "Lpu", allocList); 521 lpuNodes[i].params[0].p = pda; /* PhysDiskAddr of parity */ 522 lpuNodes[i].params[1].p = xorNodes[i].results[0]; /* buffer pointer to 523 * parity */ 524 pda = pda->next; 525 } 526 527 528 /* Step 4. connect the nodes */ 529 530 /* connect header to block node */ 531 RF_ASSERT(dag_h->numSuccedents == 1); 532 RF_ASSERT(blockNode->numAntecedents == 0); 533 dag_h->succedents[0] = blockNode; 534 535 /* connect block node to read old data nodes */ 536 RF_ASSERT(blockNode->numSuccedents == (numDataNodes + numParityNodes)); 537 for (i = 0; i < numDataNodes; i++) { 538 blockNode->succedents[i] = &readDataNodes[i]; 539 RF_ASSERT(readDataNodes[i].numAntecedents == 1); 540 readDataNodes[i].antecedents[0] = blockNode; 541 readDataNodes[i].antType[0] = rf_control; 542 } 543 544 /* connect block node to read old parity nodes */ 545 for (i = 0; i < numParityNodes; i++) { 546 blockNode->succedents[numDataNodes + i] = &readParityNodes[i]; 547 RF_ASSERT(readParityNodes[i].numAntecedents == 1); 548 readParityNodes[i].antecedents[0] = blockNode; 549 readParityNodes[i].antType[0] = rf_control; 550 } 551 552 /* connect read old data nodes to write new data nodes */ 553 for (i = 0; i < numDataNodes; i++) { 554 RF_ASSERT(readDataNodes[i].numSuccedents == numDataNodes + numParityNodes); 555 for (j = 0; j < numDataNodes; j++) { 556 RF_ASSERT(writeDataNodes[j].numAntecedents == numDataNodes + numParityNodes); 557 readDataNodes[i].succedents[j] = &writeDataNodes[j]; 558 writeDataNodes[j].antecedents[i] = &readDataNodes[i]; 559 if (i == j) 560 writeDataNodes[j].antType[i] = rf_antiData; 561 else 562 writeDataNodes[j].antType[i] = rf_control; 563 } 564 } 565 566 /* connect read old data nodes to xor nodes */ 567 for (i = 0; i < numDataNodes; i++) 568 for (j = 0; j < numParityNodes; j++) { 569 RF_ASSERT(xorNodes[j].numAntecedents == numDataNodes + numParityNodes); 570 readDataNodes[i].succedents[numDataNodes + j] = &xorNodes[j]; 571 xorNodes[j].antecedents[i] = &readDataNodes[i]; 572 xorNodes[j].antType[i] = rf_trueData; 573 } 574 575 /* connect read old parity nodes to write new data nodes */ 576 for (i = 0; i < numParityNodes; i++) { 577 RF_ASSERT(readParityNodes[i].numSuccedents == numDataNodes + numParityNodes); 578 for (j = 0; j < numDataNodes; j++) { 579 readParityNodes[i].succedents[j] = &writeDataNodes[j]; 580 writeDataNodes[j].antecedents[numDataNodes + i] = &readParityNodes[i]; 581 writeDataNodes[j].antType[numDataNodes + i] = rf_control; 582 } 583 } 584 585 /* connect read old parity nodes to xor nodes */ 586 for (i = 0; i < numParityNodes; i++) 587 for (j = 0; j < numParityNodes; j++) { 588 readParityNodes[i].succedents[numDataNodes + j] = &xorNodes[j]; 589 xorNodes[j].antecedents[numDataNodes + i] = &readParityNodes[i]; 590 xorNodes[j].antType[numDataNodes + i] = rf_trueData; 591 } 592 593 /* connect xor nodes to write new parity nodes */ 594 for (i = 0; i < numParityNodes; i++) { 595 RF_ASSERT(xorNodes[i].numSuccedents == 1); 596 RF_ASSERT(lpuNodes[i].numAntecedents == 1); 597 xorNodes[i].succedents[0] = &lpuNodes[i]; 598 lpuNodes[i].antecedents[0] = &xorNodes[i]; 599 lpuNodes[i].antType[0] = rf_trueData; 600 } 601 602 for (i = 0; i < numDataNodes; i++) { 603 if (lu_flag) { 604 /* connect write new data nodes to unlock nodes */ 605 RF_ASSERT(writeDataNodes[i].numSuccedents == 1); 606 RF_ASSERT(unlockDataNodes[i].numAntecedents == 1); 607 writeDataNodes[i].succedents[0] = &unlockDataNodes[i]; 608 unlockDataNodes[i].antecedents[0] = &writeDataNodes[i]; 609 unlockDataNodes[i].antType[0] = rf_control; 610 611 /* connect unlock nodes to unblock node */ 612 RF_ASSERT(unlockDataNodes[i].numSuccedents == 1); 613 RF_ASSERT(unblockNode->numAntecedents == (numDataNodes + (nfaults * numParityNodes))); 614 unlockDataNodes[i].succedents[0] = unblockNode; 615 unblockNode->antecedents[i] = &unlockDataNodes[i]; 616 unblockNode->antType[i] = rf_control; 617 } else { 618 /* connect write new data nodes to unblock node */ 619 RF_ASSERT(writeDataNodes[i].numSuccedents == 1); 620 RF_ASSERT(unblockNode->numAntecedents == (numDataNodes + (nfaults * numParityNodes))); 621 writeDataNodes[i].succedents[0] = unblockNode; 622 unblockNode->antecedents[i] = &writeDataNodes[i]; 623 unblockNode->antType[i] = rf_control; 624 } 625 } 626 627 /* connect write new parity nodes to unblock node */ 628 for (i = 0; i < numParityNodes; i++) { 629 RF_ASSERT(lpuNodes[i].numSuccedents == 1); 630 lpuNodes[i].succedents[0] = unblockNode; 631 unblockNode->antecedents[numDataNodes + i] = &lpuNodes[i]; 632 unblockNode->antType[numDataNodes + i] = rf_control; 633 } 634 635 /* connect unblock node to terminator */ 636 RF_ASSERT(unblockNode->numSuccedents == 1); 637 RF_ASSERT(termNode->numAntecedents == 1); 638 RF_ASSERT(termNode->numSuccedents == 0); 639 unblockNode->succedents[0] = termNode; 640 termNode->antecedents[0] = unblockNode; 641 termNode->antType[0] = rf_control; 642 } 643 644 645 void 646 rf_CreateParityLoggingSmallWriteDAG( 647 RF_Raid_t * raidPtr, 648 RF_AccessStripeMap_t * asmap, 649 RF_DagHeader_t * dag_h, 650 void *bp, 651 RF_RaidAccessFlags_t flags, 652 RF_AllocListElem_t * allocList, 653 RF_RedFuncs_t * pfuncs, 654 RF_RedFuncs_t * qfuncs) 655 { 656 dag_h->creator = "ParityLoggingSmallWriteDAG"; 657 rf_CommonCreateParityLoggingSmallWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, &rf_xorFuncs, NULL); 658 } 659 660 661 void 662 rf_CreateParityLoggingLargeWriteDAG( 663 RF_Raid_t * raidPtr, 664 RF_AccessStripeMap_t * asmap, 665 RF_DagHeader_t * dag_h, 666 void *bp, 667 RF_RaidAccessFlags_t flags, 668 RF_AllocListElem_t * allocList, 669 int nfaults, 670 int (*redFunc) (RF_DagNode_t *)) 671 { 672 dag_h->creator = "ParityLoggingSmallWriteDAG"; 673 rf_CommonCreateParityLoggingLargeWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, 1, rf_RegularXorFunc); 674 } 675 #endif /* RF_INCLUDE_PARITYLOGGING > 0 */ 676