1 /* $NetBSD: rf_evenodd.c,v 1.23 2021/07/23 00:54:45 oster Exp $ */
2 /*
3 * Copyright (c) 1995 Carnegie-Mellon University.
4 * All rights reserved.
5 *
6 * Author: Chang-Ming Wu
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 /*****************************************************************************************
30 *
31 * rf_evenodd.c -- implements EVENODD array architecture
32 *
33 ****************************************************************************************/
34
35 #include <sys/cdefs.h>
36 __KERNEL_RCSID(0, "$NetBSD: rf_evenodd.c,v 1.23 2021/07/23 00:54:45 oster Exp $");
37
38 #include "rf_archs.h"
39
40 #if RF_INCLUDE_EVENODD > 0
41
42 #include <dev/raidframe/raidframevar.h>
43
44 #include "rf_raid.h"
45 #include "rf_dag.h"
46 #include "rf_dagffrd.h"
47 #include "rf_dagffwr.h"
48 #include "rf_dagdegrd.h"
49 #include "rf_dagdegwr.h"
50 #include "rf_dagutils.h"
51 #include "rf_dagfuncs.h"
52 #include "rf_etimer.h"
53 #include "rf_general.h"
54 #include "rf_evenodd.h"
55 #include "rf_parityscan.h"
56 #include "rf_utils.h"
57 #include "rf_map.h"
58 #include "rf_pq.h"
59 #include "rf_mcpair.h"
60 #include "rf_evenodd_dagfuncs.h"
61 #include "rf_evenodd_dags.h"
62 #include "rf_engine.h"
63
64 typedef struct RF_EvenOddConfigInfo_s {
65 RF_RowCol_t **stripeIdentifier; /* filled in at config time & used by
66 * IdentifyStripe */
67 } RF_EvenOddConfigInfo_t;
68
69 int
rf_ConfigureEvenOdd(RF_ShutdownList_t ** listp,RF_Raid_t * raidPtr,RF_Config_t * cfgPtr)70 rf_ConfigureEvenOdd(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr,
71 RF_Config_t *cfgPtr)
72 {
73 RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
74 RF_EvenOddConfigInfo_t *info;
75 RF_RowCol_t i, j, startdisk;
76
77 info = RF_MallocAndAdd(sizeof(*info), raidPtr->cleanupList);
78 layoutPtr->layoutSpecificInfo = (void *) info;
79
80 info->stripeIdentifier = rf_make_2d_array(raidPtr->numCol, raidPtr->numCol, raidPtr->cleanupList);
81 startdisk = 0;
82 for (i = 0; i < raidPtr->numCol; i++) {
83 for (j = 0; j < raidPtr->numCol; j++) {
84 info->stripeIdentifier[i][j] = (startdisk + j) % raidPtr->numCol;
85 }
86 if ((startdisk -= 2) < 0)
87 startdisk += raidPtr->numCol;
88 }
89
90 /* fill in the remaining layout parameters */
91 layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk;
92 layoutPtr->numDataCol = raidPtr->numCol - 2; /* ORIG:
93 * layoutPtr->numDataCol
94 * = raidPtr->numCol-1; */
95 #if RF_EO_MATRIX_DIM > 17
96 if (raidPtr->numCol <= 17) {
97 printf("Number of stripe units in a parity stripe is smaller than 17. Please\n");
98 printf("define the macro RF_EO_MATRIX_DIM in file rf_evenodd_dagfuncs.h to \n");
99 printf("be 17 to increase performance. \n");
100 return (EINVAL);
101 }
102 #elif RF_EO_MATRIX_DIM == 17
103 if (raidPtr->numCol > 17) {
104 printf("Number of stripe units in a parity stripe is bigger than 17. Please\n");
105 printf("define the macro RF_EO_MATRIX_DIM in file rf_evenodd_dagfuncs.h to \n");
106 printf("be 257 for encoding and decoding functions to work. \n");
107 return (EINVAL);
108 }
109 #endif
110 layoutPtr->dataSectorsPerStripe = layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit;
111 layoutPtr->numParityCol = 2;
112 layoutPtr->dataStripeUnitsPerDisk = layoutPtr->stripeUnitsPerDisk;
113 raidPtr->sectorsPerDisk = layoutPtr->stripeUnitsPerDisk * layoutPtr->sectorsPerStripeUnit;
114
115 raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk * layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit;
116
117 return (0);
118 }
119
120 int
rf_GetDefaultNumFloatingReconBuffersEvenOdd(RF_Raid_t * raidPtr)121 rf_GetDefaultNumFloatingReconBuffersEvenOdd(RF_Raid_t *raidPtr)
122 {
123 return (20);
124 }
125
126 RF_HeadSepLimit_t
rf_GetDefaultHeadSepLimitEvenOdd(RF_Raid_t * raidPtr)127 rf_GetDefaultHeadSepLimitEvenOdd(RF_Raid_t *raidPtr)
128 {
129 return (10);
130 }
131
132 void
rf_IdentifyStripeEvenOdd(RF_Raid_t * raidPtr,RF_RaidAddr_t addr,RF_RowCol_t ** diskids)133 rf_IdentifyStripeEvenOdd(RF_Raid_t *raidPtr, RF_RaidAddr_t addr,
134 RF_RowCol_t **diskids)
135 {
136 RF_StripeNum_t stripeID = rf_RaidAddressToStripeID(&raidPtr->Layout, addr);
137 RF_EvenOddConfigInfo_t *info = (RF_EvenOddConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
138
139 *diskids = info->stripeIdentifier[stripeID % raidPtr->numCol];
140 }
141 /* The layout of stripe unit on the disks are: c0 c1 c2 c3 c4
142
143 0 1 2 E P
144 5 E P 3 4
145 P 6 7 8 E
146 10 11 E P 9
147 E P 12 13 14
148 ....
149
150 We use the MapSectorRAID5 to map data information because the routine can be shown to map exactly
151 the layout of data stripe unit as shown above although we have 2 redundant information now.
152 But for E and P, we use rf_MapEEvenOdd and rf_MapParityEvenOdd which are different method from raid-5.
153 */
154
155
156 void
rf_MapParityEvenOdd(RF_Raid_t * raidPtr,RF_RaidAddr_t raidSector,RF_RowCol_t * col,RF_SectorNum_t * diskSector,int remap)157 rf_MapParityEvenOdd(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
158 RF_RowCol_t *col,
159 RF_SectorNum_t *diskSector, int remap)
160 {
161 RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
162 RF_StripeNum_t endSUIDofthisStrip = (SUID / raidPtr->Layout.numDataCol + 1) * raidPtr->Layout.numDataCol - 1;
163
164 *col = (endSUIDofthisStrip + 2) % raidPtr->numCol;
165 *diskSector = (SUID / (raidPtr->Layout.numDataCol)) * raidPtr->Layout.sectorsPerStripeUnit +
166 (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
167 }
168
169 void
rf_MapEEvenOdd(RF_Raid_t * raidPtr,RF_RaidAddr_t raidSector,RF_RowCol_t * col,RF_SectorNum_t * diskSector,int remap)170 rf_MapEEvenOdd(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
171 RF_RowCol_t *col, RF_SectorNum_t *diskSector,
172 int remap)
173 {
174 RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
175 RF_StripeNum_t endSUIDofthisStrip = (SUID / raidPtr->Layout.numDataCol + 1) * raidPtr->Layout.numDataCol - 1;
176
177 *col = (endSUIDofthisStrip + 1) % raidPtr->numCol;
178 *diskSector = (SUID / (raidPtr->Layout.numDataCol)) * raidPtr->Layout.sectorsPerStripeUnit +
179 (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
180 }
181
182 void
rf_EODagSelect(RF_Raid_t * raidPtr,RF_IoType_t type,RF_AccessStripeMap_t * asmap,RF_VoidFuncPtr * createFunc)183 rf_EODagSelect(RF_Raid_t *raidPtr, RF_IoType_t type,
184 RF_AccessStripeMap_t *asmap, RF_VoidFuncPtr *createFunc)
185 {
186 RF_RaidLayout_t *layoutPtr = &(raidPtr->Layout);
187 unsigned ndfail = asmap->numDataFailed;
188 unsigned npfail = asmap->numParityFailed + asmap->numQFailed;
189 unsigned ntfail = npfail + ndfail;
190
191 RF_ASSERT(RF_IO_IS_R_OR_W(type));
192 if (ntfail > 2) {
193 RF_ERRORMSG("more than two disks failed in a single group! Aborting I/O operation.\n");
194 *createFunc = NULL;
195 return;
196 }
197 /* ok, we can do this I/O */
198 if (type == RF_IO_TYPE_READ) {
199 switch (ndfail) {
200 case 0:
201 /* fault free read */
202 *createFunc = (RF_VoidFuncPtr) rf_CreateFaultFreeReadDAG; /* same as raid 5 */
203 break;
204 case 1:
205 /* lost a single data unit */
206 /* two cases: (1) parity is not lost. do a normal raid
207 * 5 reconstruct read. (2) parity is lost. do a
208 * reconstruct read using "e". */
209 if (ntfail == 2) { /* also lost redundancy */
210 if (asmap->failedPDAs[1]->type == RF_PDA_TYPE_PARITY)
211 *createFunc = (RF_VoidFuncPtr) rf_EO_110_CreateReadDAG;
212 else
213 *createFunc = (RF_VoidFuncPtr) rf_EO_101_CreateReadDAG;
214 } else {
215 /* P and E are ok. But is there a failure in
216 * some unaccessed data unit? */
217 if (rf_NumFailedDataUnitsInStripe(raidPtr, asmap) == 2)
218 *createFunc = (RF_VoidFuncPtr) rf_EO_200_CreateReadDAG;
219 else
220 *createFunc = (RF_VoidFuncPtr) rf_EO_100_CreateReadDAG;
221 }
222 break;
223 case 2:
224 /* *createFunc = rf_EO_200_CreateReadDAG; */
225 *createFunc = NULL;
226 break;
227 }
228 return;
229 }
230 /* a write */
231 switch (ntfail) {
232 case 0: /* fault free */
233 if (rf_suppressLocksAndLargeWrites ||
234 (((asmap->numStripeUnitsAccessed <= (layoutPtr->numDataCol / 2)) && (layoutPtr->numDataCol != 1)) ||
235 (asmap->parityInfo->next != NULL) || (asmap->qInfo->next != NULL) || rf_CheckStripeForFailures(raidPtr, asmap))) {
236
237 *createFunc = (RF_VoidFuncPtr) rf_EOCreateSmallWriteDAG;
238 } else {
239 *createFunc = (RF_VoidFuncPtr) rf_EOCreateLargeWriteDAG;
240 }
241 break;
242
243 case 1: /* single disk fault */
244 if (npfail == 1) {
245 RF_ASSERT((asmap->failedPDAs[0]->type == RF_PDA_TYPE_PARITY) || (asmap->failedPDAs[0]->type == RF_PDA_TYPE_Q));
246 if (asmap->failedPDAs[0]->type == RF_PDA_TYPE_Q) { /* q died, treat like
247 * normal mode raid5
248 * write. */
249 if (((asmap->numStripeUnitsAccessed <= (layoutPtr->numDataCol / 2)) || (asmap->numStripeUnitsAccessed == 1))
250 || (asmap->parityInfo->next != NULL) || rf_NumFailedDataUnitsInStripe(raidPtr, asmap))
251 *createFunc = (RF_VoidFuncPtr) rf_EO_001_CreateSmallWriteDAG;
252 else
253 *createFunc = (RF_VoidFuncPtr) rf_EO_001_CreateLargeWriteDAG;
254 } else {/* parity died, small write only updating Q */
255 if (((asmap->numStripeUnitsAccessed <= (layoutPtr->numDataCol / 2)) || (asmap->numStripeUnitsAccessed == 1))
256 || (asmap->qInfo->next != NULL) || rf_NumFailedDataUnitsInStripe(raidPtr, asmap))
257 *createFunc = (RF_VoidFuncPtr) rf_EO_010_CreateSmallWriteDAG;
258 else
259 *createFunc = (RF_VoidFuncPtr) rf_EO_010_CreateLargeWriteDAG;
260 }
261 } else { /* data missing. Do a P reconstruct write if
262 * only a single data unit is lost in the
263 * stripe, otherwise a reconstruct write which
264 * employnig both P and E units. */
265 if (rf_NumFailedDataUnitsInStripe(raidPtr, asmap) == 2) {
266 if (asmap->numStripeUnitsAccessed == 1)
267 *createFunc = (RF_VoidFuncPtr) rf_EO_200_CreateWriteDAG;
268 else
269 *createFunc = NULL; /* No direct support for
270 * this case now, like
271 * that in Raid-5 */
272 } else {
273 if (asmap->numStripeUnitsAccessed != 1 && asmap->failedPDAs[0]->numSector != layoutPtr->sectorsPerStripeUnit)
274 *createFunc = NULL; /* No direct support for
275 * this case now, like
276 * that in Raid-5 */
277 else
278 *createFunc = (RF_VoidFuncPtr) rf_EO_100_CreateWriteDAG;
279 }
280 }
281 break;
282
283 case 2: /* two disk faults */
284 switch (npfail) {
285 case 2: /* both p and q dead */
286 *createFunc = (RF_VoidFuncPtr) rf_EO_011_CreateWriteDAG;
287 break;
288 case 1: /* either p or q and dead data */
289 RF_ASSERT(asmap->failedPDAs[0]->type == RF_PDA_TYPE_DATA);
290 RF_ASSERT((asmap->failedPDAs[1]->type == RF_PDA_TYPE_PARITY) || (asmap->failedPDAs[1]->type == RF_PDA_TYPE_Q));
291 if (asmap->failedPDAs[1]->type == RF_PDA_TYPE_Q) {
292 if (asmap->numStripeUnitsAccessed != 1 && asmap->failedPDAs[0]->numSector != layoutPtr->sectorsPerStripeUnit)
293 *createFunc = NULL; /* In both PQ and
294 * EvenOdd, no direct
295 * support for this case
296 * now, like that in
297 * Raid-5 */
298 else
299 *createFunc = (RF_VoidFuncPtr) rf_EO_101_CreateWriteDAG;
300 } else {
301 if (asmap->numStripeUnitsAccessed != 1 && asmap->failedPDAs[0]->numSector != layoutPtr->sectorsPerStripeUnit)
302 *createFunc = NULL; /* No direct support for
303 * this case, like that
304 * in Raid-5 */
305 else
306 *createFunc = (RF_VoidFuncPtr) rf_EO_110_CreateWriteDAG;
307 }
308 break;
309 case 0: /* double data loss */
310 /* if(asmap->failedPDAs[0]->numSector +
311 * asmap->failedPDAs[1]->numSector == 2 *
312 * layoutPtr->sectorsPerStripeUnit ) createFunc =
313 * rf_EOCreateLargeWriteDAG; else */
314 *createFunc = NULL; /* currently, in Evenodd, No
315 * support for simultaneous
316 * access of both failed SUs */
317 break;
318 }
319 break;
320
321 default: /* more than 2 disk faults */
322 *createFunc = NULL;
323 RF_PANIC();
324 }
325 return;
326 }
327
328
329 int
rf_VerifyParityEvenOdd(RF_Raid_t * raidPtr,RF_RaidAddr_t raidAddr,RF_PhysDiskAddr_t * parityPDA,int correct_it,RF_RaidAccessFlags_t flags)330 rf_VerifyParityEvenOdd(RF_Raid_t *raidPtr, RF_RaidAddr_t raidAddr,
331 RF_PhysDiskAddr_t *parityPDA, int correct_it,
332 RF_RaidAccessFlags_t flags)
333 {
334 RF_RaidLayout_t *layoutPtr = &(raidPtr->Layout);
335 RF_RaidAddr_t startAddr = rf_RaidAddressOfPrevStripeBoundary(layoutPtr, raidAddr);
336 RF_SectorCount_t numsector = parityPDA->numSector;
337 int numbytes = rf_RaidAddressToByte(raidPtr, numsector);
338 int bytesPerStripe = numbytes * layoutPtr->numDataCol;
339 RF_DagHeader_t *rd_dag_h, *wr_dag_h; /* read, write dag */
340 RF_DagNode_t *blockNode, *wrBlock;
341 RF_AccessStripeMapHeader_t *asm_h;
342 RF_AccessStripeMap_t *asmap;
343 RF_AllocListElem_t *alloclist;
344 RF_PhysDiskAddr_t *pda;
345 char *pbuf, *buf, *end_p, *p;
346 char *redundantbuf2;
347 int redundantTwoErr = 0, redundantOneErr = 0;
348 int parity_cant_correct = RF_FALSE, red2_cant_correct = RF_FALSE,
349 parity_corrected = RF_FALSE, red2_corrected = RF_FALSE;
350 int i, retcode;
351 RF_ReconUnitNum_t which_ru;
352 RF_StripeNum_t psID = rf_RaidAddressToParityStripeID(layoutPtr, raidAddr, &which_ru);
353 int stripeWidth = layoutPtr->numDataCol + layoutPtr->numParityCol;
354 RF_AccTraceEntry_t tracerec;
355 RF_MCPair_t *mcpair;
356
357 retcode = RF_PARITY_OKAY;
358
359 mcpair = rf_AllocMCPair(raidPtr);
360 rf_MakeAllocList(alloclist);
361 buf = RF_MallocAndAdd(
362 numbytes * (layoutPtr->numDataCol + layoutPtr->numParityCol),
363 alloclist);
364 pbuf = RF_MallocAndAdd(numbytes, alloclist);
365 end_p = buf + bytesPerStripe;
366 redundantbuf2 = RF_MallocAndAdd(numbytes, alloclist);
367
368 rd_dag_h = rf_MakeSimpleDAG(raidPtr, stripeWidth, numbytes, buf, rf_DiskReadFunc, rf_DiskReadUndoFunc,
369 "Rod", alloclist, flags, RF_IO_NORMAL_PRIORITY);
370 blockNode = rd_dag_h->succedents[0];
371
372 /* map the stripe and fill in the PDAs in the dag */
373 asm_h = rf_MapAccess(raidPtr, startAddr, layoutPtr->dataSectorsPerStripe, buf, RF_DONT_REMAP);
374 asmap = asm_h->stripeMap;
375
376 for (pda = asmap->physInfo, i = 0; i < layoutPtr->numDataCol; i++, pda = pda->next) {
377 RF_ASSERT(pda);
378 rf_RangeRestrictPDA(raidPtr, parityPDA, pda, 0, 1);
379 RF_ASSERT(pda->numSector != 0);
380 if (rf_TryToRedirectPDA(raidPtr, pda, 0))
381 goto out; /* no way to verify parity if disk is
382 * dead. return w/ good status */
383 blockNode->succedents[i]->params[0].p = pda;
384 blockNode->succedents[i]->params[2].v = psID;
385 blockNode->succedents[i]->params[3].v = RF_CREATE_PARAM3(RF_IO_NORMAL_PRIORITY, which_ru);
386 }
387
388 RF_ASSERT(!asmap->parityInfo->next);
389 rf_RangeRestrictPDA(raidPtr, parityPDA, asmap->parityInfo, 0, 1);
390 RF_ASSERT(asmap->parityInfo->numSector != 0);
391 if (rf_TryToRedirectPDA(raidPtr, asmap->parityInfo, 1))
392 goto out;
393 blockNode->succedents[layoutPtr->numDataCol]->params[0].p = asmap->parityInfo;
394
395 RF_ASSERT(!asmap->qInfo->next);
396 rf_RangeRestrictPDA(raidPtr, parityPDA, asmap->qInfo, 0, 1);
397 RF_ASSERT(asmap->qInfo->numSector != 0);
398 if (rf_TryToRedirectPDA(raidPtr, asmap->qInfo, 1))
399 goto out;
400 /* if disk is dead, b/c no reconstruction is implemented right now,
401 * the function "rf_TryToRedirectPDA" always return one, which cause
402 * go to out and return w/ good status */
403 blockNode->succedents[layoutPtr->numDataCol + 1]->params[0].p = asmap->qInfo;
404
405 /* fire off the DAG */
406 memset(&tracerec, 0, sizeof(tracerec));
407 rd_dag_h->tracerec = &tracerec;
408
409 #if RF_DEBUG_VALIDATE_DAG
410 if (rf_verifyParityDebug) {
411 printf("Parity verify read dag:\n");
412 rf_PrintDAGList(rd_dag_h);
413 }
414 #endif
415 RF_LOCK_MCPAIR(mcpair);
416 mcpair->flag = 0;
417 rf_DispatchDAG(rd_dag_h, (void (*) (void *)) rf_MCPairWakeupFunc,
418 (void *) mcpair);
419 while (!mcpair->flag)
420 RF_WAIT_MCPAIR(mcpair);
421 RF_UNLOCK_MCPAIR(mcpair);
422 if (rd_dag_h->status != rf_enable) {
423 RF_ERRORMSG("Unable to verify parity: can't read the stripe\n");
424 retcode = RF_PARITY_COULD_NOT_VERIFY;
425 goto out;
426 }
427 for (p = buf, i = 0; p < end_p; p += numbytes, i++) {
428 rf_e_encToBuf(raidPtr, i, p, RF_EO_MATRIX_DIM - 2, redundantbuf2, numsector);
429 /* the corresponding columes in EvenOdd encoding Matrix for
430 * these p pointers which point to the databuffer in a full
431 * stripe are sequentially from 0 to layoutPtr->numDataCol-1 */
432 rf_bxor(p, pbuf, numbytes);
433 }
434 RF_ASSERT(i == layoutPtr->numDataCol);
435
436 for (i = 0; i < numbytes; i++) {
437 if (pbuf[i] != buf[bytesPerStripe + i]) {
438 if (!correct_it) {
439 RF_ERRORMSG3("Parity verify error: byte %d of parity is 0x%x should be 0x%x\n",
440 i, (u_char) buf[bytesPerStripe + i], (u_char) pbuf[i]);
441 }
442 }
443 redundantOneErr = 1;
444 break;
445 }
446
447 for (i = 0; i < numbytes; i++) {
448 if (redundantbuf2[i] != buf[bytesPerStripe + numbytes + i]) {
449 if (!correct_it) {
450 RF_ERRORMSG3("Parity verify error: byte %d of second redundant information is 0x%x should be 0x%x\n",
451 i, (u_char) buf[bytesPerStripe + numbytes + i], (u_char) redundantbuf2[i]);
452 }
453 redundantTwoErr = 1;
454 break;
455 }
456 }
457 if (redundantOneErr || redundantTwoErr)
458 retcode = RF_PARITY_BAD;
459
460 /* correct the first redundant disk, ie parity if it is error */
461 if (redundantOneErr && correct_it) {
462 wr_dag_h = rf_MakeSimpleDAG(raidPtr, 1, numbytes, pbuf, rf_DiskWriteFunc, rf_DiskWriteUndoFunc,
463 "Wnp", alloclist, flags, RF_IO_NORMAL_PRIORITY);
464 wrBlock = wr_dag_h->succedents[0];
465 wrBlock->succedents[0]->params[0].p = asmap->parityInfo;
466 wrBlock->succedents[0]->params[2].v = psID;
467 wrBlock->succedents[0]->params[3].v = RF_CREATE_PARAM3(RF_IO_NORMAL_PRIORITY, which_ru);
468 memset(&tracerec, 0, sizeof(tracerec));
469 wr_dag_h->tracerec = &tracerec;
470 #if RF_DEBUG_VALIDATE_DAG
471 if (rf_verifyParityDebug) {
472 printf("Parity verify write dag:\n");
473 rf_PrintDAGList(wr_dag_h);
474 }
475 #endif
476 RF_LOCK_MCPAIR(mcpair);
477 mcpair->flag = 0;
478 rf_DispatchDAG(wr_dag_h, (void (*) (void *)) rf_MCPairWakeupFunc,
479 (void *) mcpair);
480 while (!mcpair->flag)
481 RF_WAIT_MCPAIR(mcpair);
482 RF_UNLOCK_MCPAIR(mcpair);
483 if (wr_dag_h->status != rf_enable) {
484 RF_ERRORMSG("Unable to correct parity in VerifyParity: can't write the stripe\n");
485 parity_cant_correct = RF_TRUE;
486 } else {
487 parity_corrected = RF_TRUE;
488 }
489 rf_FreeDAG(wr_dag_h);
490 }
491 if (redundantTwoErr && correct_it) {
492 wr_dag_h = rf_MakeSimpleDAG(raidPtr, 1, numbytes, redundantbuf2, rf_DiskWriteFunc, rf_DiskWriteUndoFunc,
493 "Wnred2", alloclist, flags, RF_IO_NORMAL_PRIORITY);
494 wrBlock = wr_dag_h->succedents[0];
495 wrBlock->succedents[0]->params[0].p = asmap->qInfo;
496 wrBlock->succedents[0]->params[2].v = psID;
497 wrBlock->succedents[0]->params[3].v = RF_CREATE_PARAM3(RF_IO_NORMAL_PRIORITY, which_ru);
498 memset(&tracerec, 0, sizeof(tracerec));
499 wr_dag_h->tracerec = &tracerec;
500 #if RF_DEBUG_VALIDATE_DAG
501 if (rf_verifyParityDebug) {
502 printf("Dag of write new second redundant information in parity verify :\n");
503 rf_PrintDAGList(wr_dag_h);
504 }
505 #endif
506 RF_LOCK_MCPAIR(mcpair);
507 mcpair->flag = 0;
508 rf_DispatchDAG(wr_dag_h, (void (*) (void *)) rf_MCPairWakeupFunc,
509 (void *) mcpair);
510 while (!mcpair->flag)
511 RF_WAIT_MCPAIR(mcpair);
512 RF_UNLOCK_MCPAIR(mcpair);
513 if (wr_dag_h->status != rf_enable) {
514 RF_ERRORMSG("Unable to correct second redundant information in VerifyParity: can't write the stripe\n");
515 red2_cant_correct = RF_TRUE;
516 } else {
517 red2_corrected = RF_TRUE;
518 }
519 rf_FreeDAG(wr_dag_h);
520 }
521 if ((redundantOneErr && parity_cant_correct) ||
522 (redundantTwoErr && red2_cant_correct))
523 retcode = RF_PARITY_COULD_NOT_CORRECT;
524 if ((retcode = RF_PARITY_BAD) && parity_corrected && red2_corrected)
525 retcode = RF_PARITY_CORRECTED;
526
527
528 out:
529 rf_FreeAccessStripeMap(raidPtr, asm_h);
530 rf_FreeAllocList(alloclist);
531 rf_FreeDAG(rd_dag_h);
532 rf_FreeMCPair(raidPtr, mcpair);
533 return (retcode);
534 }
535 #endif /* RF_INCLUDE_EVENODD > 0 */
536