1 /* $NetBSD: rf_driver.c,v 1.126 2011/04/30 01:44:36 mrg Exp $ */ 2 /*- 3 * Copyright (c) 1999 The NetBSD Foundation, Inc. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to The NetBSD Foundation 7 * by Greg Oster 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 /* 32 * Copyright (c) 1995 Carnegie-Mellon University. 33 * All rights reserved. 34 * 35 * Author: Mark Holland, Khalil Amiri, Claudson Bornstein, William V. Courtright II, 36 * Robby Findler, Daniel Stodolsky, Rachad Youssef, Jim Zelenka 37 * 38 * Permission to use, copy, modify and distribute this software and 39 * its documentation is hereby granted, provided that both the copyright 40 * notice and this permission notice appear in all copies of the 41 * software, derivative works or modified versions, and any portions 42 * thereof, and that both notices appear in supporting documentation. 43 * 44 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 45 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 46 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 47 * 48 * Carnegie Mellon requests users of this software to return to 49 * 50 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 51 * School of Computer Science 52 * Carnegie Mellon University 53 * Pittsburgh PA 15213-3890 54 * 55 * any improvements or extensions that they make and grant Carnegie the 56 * rights to redistribute these changes. 57 */ 58 59 /****************************************************************************** 60 * 61 * rf_driver.c -- main setup, teardown, and access routines for the RAID driver 62 * 63 * all routines are prefixed with rf_ (raidframe), to avoid conficts. 64 * 65 ******************************************************************************/ 66 67 68 #include <sys/cdefs.h> 69 __KERNEL_RCSID(0, "$NetBSD: rf_driver.c,v 1.126 2011/04/30 01:44:36 mrg Exp $"); 70 71 #ifdef _KERNEL_OPT 72 #include "opt_raid_diagnostic.h" 73 #endif 74 75 #include <sys/param.h> 76 #include <sys/systm.h> 77 #include <sys/ioctl.h> 78 #include <sys/fcntl.h> 79 #include <sys/vnode.h> 80 81 82 #include "rf_archs.h" 83 #include "rf_threadstuff.h" 84 85 #include <sys/errno.h> 86 87 #include "rf_raid.h" 88 #include "rf_dag.h" 89 #include "rf_aselect.h" 90 #include "rf_diskqueue.h" 91 #include "rf_parityscan.h" 92 #include "rf_alloclist.h" 93 #include "rf_dagutils.h" 94 #include "rf_utils.h" 95 #include "rf_etimer.h" 96 #include "rf_acctrace.h" 97 #include "rf_general.h" 98 #include "rf_desc.h" 99 #include "rf_states.h" 100 #include "rf_decluster.h" 101 #include "rf_map.h" 102 #include "rf_revent.h" 103 #include "rf_callback.h" 104 #include "rf_engine.h" 105 #include "rf_mcpair.h" 106 #include "rf_nwayxor.h" 107 #include "rf_copyback.h" 108 #include "rf_driver.h" 109 #include "rf_options.h" 110 #include "rf_shutdown.h" 111 #include "rf_kintf.h" 112 #include "rf_paritymap.h" 113 114 #include <sys/buf.h> 115 116 #ifndef RF_ACCESS_DEBUG 117 #define RF_ACCESS_DEBUG 0 118 #endif 119 120 /* rad == RF_RaidAccessDesc_t */ 121 #define RF_MAX_FREE_RAD 128 122 #define RF_MIN_FREE_RAD 32 123 124 /* debug variables */ 125 char rf_panicbuf[2048]; /* a buffer to hold an error msg when we panic */ 126 127 /* main configuration routines */ 128 static int raidframe_booted = 0; 129 130 static void rf_ConfigureDebug(RF_Config_t * cfgPtr); 131 static void set_debug_option(char *name, long val); 132 static void rf_UnconfigureArray(void); 133 static void rf_ShutdownRDFreeList(void *); 134 static int rf_ConfigureRDFreeList(RF_ShutdownList_t **); 135 136 rf_declare_mutex2(rf_printf_mutex); /* debug only: avoids interleaved 137 * printfs by different stripes */ 138 139 #define SIGNAL_QUIESCENT_COND(_raid_) wakeup(&((_raid_)->accesses_suspended)) 140 #define WAIT_FOR_QUIESCENCE(_raid_) \ 141 ltsleep(&((_raid_)->accesses_suspended), PRIBIO, \ 142 "raidframe quiesce", 0, &((_raid_)->access_suspend_mutex)) 143 144 static int configureCount = 0; /* number of active configurations */ 145 static int isconfigged = 0; /* is basic raidframe (non per-array) 146 * stuff configured */ 147 static rf_declare_mutex2(configureMutex); /* used to lock the configuration 148 * stuff */ 149 static RF_ShutdownList_t *globalShutdown; /* non array-specific 150 * stuff */ 151 152 static int rf_ConfigureRDFreeList(RF_ShutdownList_t ** listp); 153 static int rf_AllocEmergBuffers(RF_Raid_t *); 154 static void rf_FreeEmergBuffers(RF_Raid_t *); 155 156 /* called at system boot time */ 157 int 158 rf_BootRaidframe(void) 159 { 160 161 if (raidframe_booted) 162 return (EBUSY); 163 raidframe_booted = 1; 164 rf_init_mutex2(configureMutex, IPL_NONE); 165 configureCount = 0; 166 isconfigged = 0; 167 globalShutdown = NULL; 168 return (0); 169 } 170 171 /* 172 * Called whenever an array is shutdown 173 */ 174 static void 175 rf_UnconfigureArray(void) 176 { 177 178 rf_lock_mutex2(configureMutex); 179 if (--configureCount == 0) { /* if no active configurations, shut 180 * everything down */ 181 isconfigged = 0; 182 rf_ShutdownList(&globalShutdown); 183 184 /* 185 * We must wait until now, because the AllocList module 186 * uses the DebugMem module. 187 */ 188 #if RF_DEBUG_MEM 189 if (rf_memDebug) 190 rf_print_unfreed(); 191 #endif 192 } 193 rf_unlock_mutex2(configureMutex); 194 } 195 196 /* 197 * Called to shut down an array. 198 */ 199 int 200 rf_Shutdown(RF_Raid_t *raidPtr) 201 { 202 203 if (!raidPtr->valid) { 204 RF_ERRORMSG("Attempt to shut down unconfigured RAIDframe driver. Aborting shutdown\n"); 205 return (EINVAL); 206 } 207 /* 208 * wait for outstanding IOs to land 209 * As described in rf_raid.h, we use the rad_freelist lock 210 * to protect the per-array info about outstanding descs 211 * since we need to do freelist locking anyway, and this 212 * cuts down on the amount of serialization we've got going 213 * on. 214 */ 215 rf_lock_mutex2(raidPtr->rad_lock); 216 if (raidPtr->waitShutdown) { 217 rf_unlock_mutex2(raidPtr->rad_lock); 218 return (EBUSY); 219 } 220 raidPtr->waitShutdown = 1; 221 while (raidPtr->nAccOutstanding) { 222 rf_wait_cond2(raidPtr->outstandingCond, raidPtr->rad_lock); 223 } 224 rf_unlock_mutex2(raidPtr->rad_lock); 225 226 /* Wait for any parity re-writes to stop... */ 227 while (raidPtr->parity_rewrite_in_progress) { 228 printf("raid%d: Waiting for parity re-write to exit...\n", 229 raidPtr->raidid); 230 tsleep(&raidPtr->parity_rewrite_in_progress, PRIBIO, 231 "rfprwshutdown", 0); 232 } 233 234 /* Wait for any reconstruction to stop... */ 235 while (raidPtr->reconInProgress) { 236 printf("raid%d: Waiting for reconstruction to stop...\n", 237 raidPtr->raidid); 238 tsleep(&raidPtr->waitForReconCond, PRIBIO, 239 "rfreshutdown",0); 240 } 241 242 raidPtr->valid = 0; 243 244 if (raidPtr->parity_map != NULL) 245 rf_paritymap_detach(raidPtr); 246 247 rf_update_component_labels(raidPtr, RF_FINAL_COMPONENT_UPDATE); 248 249 rf_UnconfigureVnodes(raidPtr); 250 251 rf_FreeEmergBuffers(raidPtr); 252 253 rf_ShutdownList(&raidPtr->shutdownList); 254 255 rf_destroy_cond2(raidPtr->outstandingCond); 256 rf_destroy_mutex2(raidPtr->rad_lock); 257 258 rf_UnconfigureArray(); 259 260 return (0); 261 } 262 263 264 #define DO_INIT_CONFIGURE(f) { \ 265 rc = f (&globalShutdown); \ 266 if (rc) { \ 267 RF_ERRORMSG2("RAIDFRAME: failed %s with %d\n", RF_STRING(f), rc); \ 268 rf_ShutdownList(&globalShutdown); \ 269 configureCount--; \ 270 rf_unlock_mutex2(configureMutex); \ 271 return(rc); \ 272 } \ 273 } 274 275 #define DO_RAID_FAIL() { \ 276 rf_UnconfigureVnodes(raidPtr); \ 277 rf_FreeEmergBuffers(raidPtr); \ 278 rf_ShutdownList(&raidPtr->shutdownList); \ 279 rf_UnconfigureArray(); \ 280 } 281 282 #define DO_RAID_INIT_CONFIGURE(f) { \ 283 rc = f (&raidPtr->shutdownList, raidPtr, cfgPtr); \ 284 if (rc) { \ 285 RF_ERRORMSG2("RAIDFRAME: failed %s with %d\n", RF_STRING(f), rc); \ 286 DO_RAID_FAIL(); \ 287 return(rc); \ 288 } \ 289 } 290 291 #define DO_RAID_MUTEX(_m_) { \ 292 rf_mutex_init((_m_)); \ 293 } 294 295 int 296 rf_Configure(RF_Raid_t *raidPtr, RF_Config_t *cfgPtr, RF_AutoConfig_t *ac) 297 { 298 RF_RowCol_t col; 299 int rc; 300 301 rf_lock_mutex2(configureMutex); 302 configureCount++; 303 if (isconfigged == 0) { 304 rf_init_mutex2(rf_printf_mutex, IPL_VM); 305 306 /* initialize globals */ 307 308 DO_INIT_CONFIGURE(rf_ConfigureAllocList); 309 310 /* 311 * Yes, this does make debugging general to the whole 312 * system instead of being array specific. Bummer, drag. 313 */ 314 rf_ConfigureDebug(cfgPtr); 315 DO_INIT_CONFIGURE(rf_ConfigureDebugMem); 316 #if RF_ACC_TRACE > 0 317 DO_INIT_CONFIGURE(rf_ConfigureAccessTrace); 318 #endif 319 DO_INIT_CONFIGURE(rf_ConfigureMapModule); 320 DO_INIT_CONFIGURE(rf_ConfigureReconEvent); 321 DO_INIT_CONFIGURE(rf_ConfigureCallback); 322 DO_INIT_CONFIGURE(rf_ConfigureRDFreeList); 323 DO_INIT_CONFIGURE(rf_ConfigureNWayXor); 324 DO_INIT_CONFIGURE(rf_ConfigureStripeLockFreeList); 325 DO_INIT_CONFIGURE(rf_ConfigureMCPair); 326 DO_INIT_CONFIGURE(rf_ConfigureDAGs); 327 DO_INIT_CONFIGURE(rf_ConfigureDAGFuncs); 328 DO_INIT_CONFIGURE(rf_ConfigureReconstruction); 329 DO_INIT_CONFIGURE(rf_ConfigureCopyback); 330 DO_INIT_CONFIGURE(rf_ConfigureDiskQueueSystem); 331 DO_INIT_CONFIGURE(rf_ConfigurePSStatus); 332 isconfigged = 1; 333 } 334 rf_unlock_mutex2(configureMutex); 335 336 DO_RAID_MUTEX(&raidPtr->mutex); 337 /* set up the cleanup list. Do this after ConfigureDebug so that 338 * value of memDebug will be set */ 339 340 rf_MakeAllocList(raidPtr->cleanupList); 341 if (raidPtr->cleanupList == NULL) { 342 DO_RAID_FAIL(); 343 return (ENOMEM); 344 } 345 rf_ShutdownCreate(&raidPtr->shutdownList, 346 (void (*) (void *)) rf_FreeAllocList, 347 raidPtr->cleanupList); 348 349 raidPtr->numCol = cfgPtr->numCol; 350 raidPtr->numSpare = cfgPtr->numSpare; 351 352 raidPtr->status = rf_rs_optimal; 353 raidPtr->reconControl = NULL; 354 355 DO_RAID_INIT_CONFIGURE(rf_ConfigureEngine); 356 DO_RAID_INIT_CONFIGURE(rf_ConfigureStripeLocks); 357 358 rf_init_cond2(raidPtr->outstandingCond, "rfocond"); 359 rf_init_mutex2(raidPtr->rad_lock, IPL_VM); 360 361 raidPtr->nAccOutstanding = 0; 362 raidPtr->waitShutdown = 0; 363 364 DO_RAID_MUTEX(&raidPtr->access_suspend_mutex); 365 366 raidPtr->waitForReconCond = 0; 367 368 if (ac!=NULL) { 369 /* We have an AutoConfig structure.. Don't do the 370 normal disk configuration... call the auto config 371 stuff */ 372 rf_AutoConfigureDisks(raidPtr, cfgPtr, ac); 373 } else { 374 DO_RAID_INIT_CONFIGURE(rf_ConfigureDisks); 375 DO_RAID_INIT_CONFIGURE(rf_ConfigureSpareDisks); 376 } 377 /* do this after ConfigureDisks & ConfigureSpareDisks to be sure dev 378 * no. is set */ 379 DO_RAID_INIT_CONFIGURE(rf_ConfigureDiskQueues); 380 381 DO_RAID_INIT_CONFIGURE(rf_ConfigureLayout); 382 383 /* Initialize per-RAID PSS bits */ 384 rf_InitPSStatus(raidPtr); 385 386 #if RF_INCLUDE_CHAINDECLUSTER > 0 387 for (col = 0; col < raidPtr->numCol; col++) { 388 /* 389 * XXX better distribution 390 */ 391 raidPtr->hist_diskreq[col] = 0; 392 } 393 #endif 394 raidPtr->numNewFailures = 0; 395 raidPtr->copyback_in_progress = 0; 396 raidPtr->parity_rewrite_in_progress = 0; 397 raidPtr->adding_hot_spare = 0; 398 raidPtr->recon_in_progress = 0; 399 raidPtr->maxOutstanding = cfgPtr->maxOutstandingDiskReqs; 400 401 /* autoconfigure and root_partition will actually get filled in 402 after the config is done */ 403 raidPtr->autoconfigure = 0; 404 raidPtr->root_partition = 0; 405 raidPtr->last_unit = raidPtr->raidid; 406 raidPtr->config_order = 0; 407 408 if (rf_keepAccTotals) { 409 raidPtr->keep_acc_totals = 1; 410 } 411 412 /* Allocate a bunch of buffers to be used in low-memory conditions */ 413 raidPtr->iobuf = NULL; 414 415 rc = rf_AllocEmergBuffers(raidPtr); 416 if (rc) { 417 printf("raid%d: Unable to allocate emergency buffers.\n", 418 raidPtr->raidid); 419 DO_RAID_FAIL(); 420 return(rc); 421 } 422 423 /* Set up parity map stuff, if applicable. */ 424 #ifndef RF_NO_PARITY_MAP 425 rf_paritymap_attach(raidPtr, cfgPtr->force); 426 #endif 427 428 raidPtr->valid = 1; 429 430 printf("raid%d: %s\n", raidPtr->raidid, 431 raidPtr->Layout.map->configName); 432 printf("raid%d: Components:", raidPtr->raidid); 433 434 for (col = 0; col < raidPtr->numCol; col++) { 435 printf(" %s", raidPtr->Disks[col].devname); 436 if (RF_DEAD_DISK(raidPtr->Disks[col].status)) { 437 printf("[**FAILED**]"); 438 } 439 } 440 printf("\n"); 441 printf("raid%d: Total Sectors: %" PRIu64 " (%" PRIu64 " MB)\n", 442 raidPtr->raidid, 443 raidPtr->totalSectors, 444 (raidPtr->totalSectors / 1024 * 445 (1 << raidPtr->logBytesPerSector) / 1024)); 446 447 return (0); 448 } 449 450 451 /* 452 453 Routines to allocate and free the "emergency buffers" for a given 454 RAID set. These emergency buffers will be used when the kernel runs 455 out of kernel memory. 456 457 */ 458 459 static int 460 rf_AllocEmergBuffers(RF_Raid_t *raidPtr) 461 { 462 void *tmpbuf; 463 RF_VoidPointerListElem_t *vple; 464 int i; 465 466 /* XXX next line needs tuning... */ 467 raidPtr->numEmergencyBuffers = 10 * raidPtr->numCol; 468 #if DEBUG 469 printf("raid%d: allocating %d buffers of %d bytes.\n", 470 raidPtr->raidid, 471 raidPtr->numEmergencyBuffers, 472 (int)(raidPtr->Layout.sectorsPerStripeUnit << 473 raidPtr->logBytesPerSector)); 474 #endif 475 for (i = 0; i < raidPtr->numEmergencyBuffers; i++) { 476 tmpbuf = malloc( raidPtr->Layout.sectorsPerStripeUnit << 477 raidPtr->logBytesPerSector, 478 M_RAIDFRAME, M_WAITOK); 479 if (tmpbuf) { 480 vple = rf_AllocVPListElem(); 481 vple->p= tmpbuf; 482 vple->next = raidPtr->iobuf; 483 raidPtr->iobuf = vple; 484 raidPtr->iobuf_count++; 485 } else { 486 printf("raid%d: failed to allocate emergency buffer!\n", 487 raidPtr->raidid); 488 return 1; 489 } 490 } 491 492 /* XXX next line needs tuning too... */ 493 raidPtr->numEmergencyStripeBuffers = 10; 494 for (i = 0; i < raidPtr->numEmergencyStripeBuffers; i++) { 495 tmpbuf = malloc( raidPtr->numCol * (raidPtr->Layout.sectorsPerStripeUnit << 496 raidPtr->logBytesPerSector), 497 M_RAIDFRAME, M_WAITOK); 498 if (tmpbuf) { 499 vple = rf_AllocVPListElem(); 500 vple->p= tmpbuf; 501 vple->next = raidPtr->stripebuf; 502 raidPtr->stripebuf = vple; 503 raidPtr->stripebuf_count++; 504 } else { 505 printf("raid%d: failed to allocate emergency stripe buffer!\n", 506 raidPtr->raidid); 507 return 1; 508 } 509 } 510 511 return (0); 512 } 513 514 static void 515 rf_FreeEmergBuffers(RF_Raid_t *raidPtr) 516 { 517 RF_VoidPointerListElem_t *tmp; 518 519 /* Free the emergency IO buffers */ 520 while (raidPtr->iobuf != NULL) { 521 tmp = raidPtr->iobuf; 522 raidPtr->iobuf = raidPtr->iobuf->next; 523 free(tmp->p, M_RAIDFRAME); 524 rf_FreeVPListElem(tmp); 525 } 526 527 /* Free the emergency stripe buffers */ 528 while (raidPtr->stripebuf != NULL) { 529 tmp = raidPtr->stripebuf; 530 raidPtr->stripebuf = raidPtr->stripebuf->next; 531 free(tmp->p, M_RAIDFRAME); 532 rf_FreeVPListElem(tmp); 533 } 534 } 535 536 537 static void 538 rf_ShutdownRDFreeList(void *ignored) 539 { 540 pool_destroy(&rf_pools.rad); 541 } 542 543 static int 544 rf_ConfigureRDFreeList(RF_ShutdownList_t **listp) 545 { 546 547 rf_pool_init(&rf_pools.rad, sizeof(RF_RaidAccessDesc_t), 548 "rf_rad_pl", RF_MIN_FREE_RAD, RF_MAX_FREE_RAD); 549 rf_ShutdownCreate(listp, rf_ShutdownRDFreeList, NULL); 550 return (0); 551 } 552 553 RF_RaidAccessDesc_t * 554 rf_AllocRaidAccDesc(RF_Raid_t *raidPtr, RF_IoType_t type, 555 RF_RaidAddr_t raidAddress, RF_SectorCount_t numBlocks, 556 void *bufPtr, void *bp, RF_RaidAccessFlags_t flags, 557 const RF_AccessState_t *states) 558 { 559 RF_RaidAccessDesc_t *desc; 560 561 desc = pool_get(&rf_pools.rad, PR_WAITOK); 562 563 rf_lock_mutex2(raidPtr->rad_lock); 564 if (raidPtr->waitShutdown) { 565 /* 566 * Actually, we're shutting the array down. Free the desc 567 * and return NULL. 568 */ 569 570 rf_unlock_mutex2(raidPtr->rad_lock); 571 pool_put(&rf_pools.rad, desc); 572 return (NULL); 573 } 574 raidPtr->nAccOutstanding++; 575 576 rf_unlock_mutex2(raidPtr->rad_lock); 577 578 desc->raidPtr = (void *) raidPtr; 579 desc->type = type; 580 desc->raidAddress = raidAddress; 581 desc->numBlocks = numBlocks; 582 desc->bufPtr = bufPtr; 583 desc->bp = bp; 584 desc->flags = flags; 585 desc->states = states; 586 desc->state = 0; 587 desc->dagList = NULL; 588 589 desc->status = 0; 590 desc->numRetries = 0; 591 #if RF_ACC_TRACE > 0 592 memset((char *) &desc->tracerec, 0, sizeof(RF_AccTraceEntry_t)); 593 #endif 594 desc->callbackFunc = NULL; 595 desc->callbackArg = NULL; 596 desc->next = NULL; 597 desc->iobufs = NULL; 598 desc->stripebufs = NULL; 599 600 return (desc); 601 } 602 603 void 604 rf_FreeRaidAccDesc(RF_RaidAccessDesc_t *desc) 605 { 606 RF_Raid_t *raidPtr = desc->raidPtr; 607 RF_DagList_t *dagList, *temp; 608 RF_VoidPointerListElem_t *tmp; 609 610 RF_ASSERT(desc); 611 612 /* Cleanup the dagList(s) */ 613 dagList = desc->dagList; 614 while(dagList != NULL) { 615 temp = dagList; 616 dagList = dagList->next; 617 rf_FreeDAGList(temp); 618 } 619 620 while (desc->iobufs) { 621 tmp = desc->iobufs; 622 desc->iobufs = desc->iobufs->next; 623 rf_FreeIOBuffer(raidPtr, tmp); 624 } 625 626 while (desc->stripebufs) { 627 tmp = desc->stripebufs; 628 desc->stripebufs = desc->stripebufs->next; 629 rf_FreeStripeBuffer(raidPtr, tmp); 630 } 631 632 pool_put(&rf_pools.rad, desc); 633 rf_lock_mutex2(raidPtr->rad_lock); 634 raidPtr->nAccOutstanding--; 635 if (raidPtr->waitShutdown) { 636 rf_signal_cond2(raidPtr->outstandingCond); 637 } 638 rf_unlock_mutex2(raidPtr->rad_lock); 639 } 640 /********************************************************************* 641 * Main routine for performing an access. 642 * Accesses are retried until a DAG can not be selected. This occurs 643 * when either the DAG library is incomplete or there are too many 644 * failures in a parity group. 645 * 646 * type should be read or write async_flag should be RF_TRUE or 647 * RF_FALSE bp_in is a buf pointer. void *to facilitate ignoring it 648 * outside the kernel 649 ********************************************************************/ 650 int 651 rf_DoAccess(RF_Raid_t * raidPtr, RF_IoType_t type, int async_flag, 652 RF_RaidAddr_t raidAddress, RF_SectorCount_t numBlocks, 653 void *bufPtr, struct buf *bp, RF_RaidAccessFlags_t flags) 654 { 655 RF_RaidAccessDesc_t *desc; 656 void *lbufPtr = bufPtr; 657 658 raidAddress += rf_raidSectorOffset; 659 660 #if RF_ACCESS_DEBUG 661 if (rf_accessDebug) { 662 663 printf("logBytes is: %d %d %d\n", raidPtr->raidid, 664 raidPtr->logBytesPerSector, 665 (int) rf_RaidAddressToByte(raidPtr, numBlocks)); 666 printf("raid%d: %s raidAddr %d (stripeid %d-%d) numBlocks %d (%d bytes) buf 0x%lx\n", raidPtr->raidid, 667 (type == RF_IO_TYPE_READ) ? "READ" : "WRITE", (int) raidAddress, 668 (int) rf_RaidAddressToStripeID(&raidPtr->Layout, raidAddress), 669 (int) rf_RaidAddressToStripeID(&raidPtr->Layout, raidAddress + numBlocks - 1), 670 (int) numBlocks, 671 (int) rf_RaidAddressToByte(raidPtr, numBlocks), 672 (long) bufPtr); 673 } 674 #endif 675 676 desc = rf_AllocRaidAccDesc(raidPtr, type, raidAddress, 677 numBlocks, lbufPtr, bp, flags, raidPtr->Layout.map->states); 678 679 if (desc == NULL) { 680 return (ENOMEM); 681 } 682 #if RF_ACC_TRACE > 0 683 RF_ETIMER_START(desc->tracerec.tot_timer); 684 #endif 685 desc->async_flag = async_flag; 686 687 if (raidPtr->parity_map != NULL && 688 type == RF_IO_TYPE_WRITE) 689 rf_paritymap_begin(raidPtr->parity_map, raidAddress, 690 numBlocks); 691 692 rf_ContinueRaidAccess(desc); 693 694 return (0); 695 } 696 #if 0 697 /* force the array into reconfigured mode without doing reconstruction */ 698 int 699 rf_SetReconfiguredMode(RF_Raid_t *raidPtr, int col) 700 { 701 if (!(raidPtr->Layout.map->flags & RF_DISTRIBUTE_SPARE)) { 702 printf("Can't set reconfigured mode in dedicated-spare array\n"); 703 RF_PANIC(); 704 } 705 RF_LOCK_MUTEX(raidPtr->mutex); 706 raidPtr->numFailures++; 707 raidPtr->Disks[col].status = rf_ds_dist_spared; 708 raidPtr->status = rf_rs_reconfigured; 709 rf_update_component_labels(raidPtr, RF_NORMAL_COMPONENT_UPDATE); 710 /* install spare table only if declustering + distributed sparing 711 * architecture. */ 712 if (raidPtr->Layout.map->flags & RF_BD_DECLUSTERED) 713 rf_InstallSpareTable(raidPtr, col); 714 RF_UNLOCK_MUTEX(raidPtr->mutex); 715 return (0); 716 } 717 #endif 718 719 int 720 rf_FailDisk(RF_Raid_t *raidPtr, int fcol, int initRecon) 721 { 722 723 /* need to suspend IO's here -- if there are DAGs in flight 724 and we pull the rug out from under ci_vp, Bad Things 725 can happen. */ 726 727 rf_SuspendNewRequestsAndWait(raidPtr); 728 729 RF_LOCK_MUTEX(raidPtr->mutex); 730 if (raidPtr->Disks[fcol].status != rf_ds_failed) { 731 /* must be failing something that is valid, or else it's 732 already marked as failed (in which case we don't 733 want to mark it failed again!) */ 734 raidPtr->numFailures++; 735 raidPtr->Disks[fcol].status = rf_ds_failed; 736 raidPtr->status = rf_rs_degraded; 737 } 738 RF_UNLOCK_MUTEX(raidPtr->mutex); 739 740 rf_update_component_labels(raidPtr, RF_NORMAL_COMPONENT_UPDATE); 741 742 /* Close the component, so that it's not "locked" if someone 743 else want's to use it! */ 744 745 rf_close_component(raidPtr, raidPtr->raid_cinfo[fcol].ci_vp, 746 raidPtr->Disks[fcol].auto_configured); 747 748 RF_LOCK_MUTEX(raidPtr->mutex); 749 raidPtr->raid_cinfo[fcol].ci_vp = NULL; 750 751 /* Need to mark the component as not being auto_configured 752 (in case it was previously). */ 753 754 raidPtr->Disks[fcol].auto_configured = 0; 755 RF_UNLOCK_MUTEX(raidPtr->mutex); 756 /* now we can allow IO to continue -- we'll be suspending it 757 again in rf_ReconstructFailedDisk() if we have to.. */ 758 759 rf_ResumeNewRequests(raidPtr); 760 761 if (initRecon) 762 rf_ReconstructFailedDisk(raidPtr, fcol); 763 return (0); 764 } 765 /* releases a thread that is waiting for the array to become quiesced. 766 * access_suspend_mutex should be locked upon calling this 767 */ 768 void 769 rf_SignalQuiescenceLock(RF_Raid_t *raidPtr) 770 { 771 #if RF_DEBUG_QUIESCE 772 if (rf_quiesceDebug) { 773 printf("raid%d: Signalling quiescence lock\n", 774 raidPtr->raidid); 775 } 776 #endif 777 raidPtr->access_suspend_release = 1; 778 779 if (raidPtr->waiting_for_quiescence) { 780 SIGNAL_QUIESCENT_COND(raidPtr); 781 } 782 } 783 /* suspends all new requests to the array. No effect on accesses that are in flight. */ 784 int 785 rf_SuspendNewRequestsAndWait(RF_Raid_t *raidPtr) 786 { 787 #if RF_DEBUG_QUIESCE 788 if (rf_quiesceDebug) 789 printf("raid%d: Suspending new reqs\n", raidPtr->raidid); 790 #endif 791 RF_LOCK_MUTEX(raidPtr->access_suspend_mutex); 792 raidPtr->accesses_suspended++; 793 raidPtr->waiting_for_quiescence = (raidPtr->accs_in_flight == 0) ? 0 : 1; 794 795 if (raidPtr->waiting_for_quiescence) { 796 raidPtr->access_suspend_release = 0; 797 while (!raidPtr->access_suspend_release) { 798 #if RF_DEBUG_QUIESCE 799 printf("raid%d: Suspending: Waiting for Quiescence\n", 800 raidPtr->raidid); 801 #endif 802 WAIT_FOR_QUIESCENCE(raidPtr); 803 raidPtr->waiting_for_quiescence = 0; 804 } 805 } 806 #if RF_DEBUG_QUIESCE 807 printf("raid%d: Quiescence reached..\n", raidPtr->raidid); 808 #endif 809 810 RF_UNLOCK_MUTEX(raidPtr->access_suspend_mutex); 811 return (raidPtr->waiting_for_quiescence); 812 } 813 /* wake up everyone waiting for quiescence to be released */ 814 void 815 rf_ResumeNewRequests(RF_Raid_t *raidPtr) 816 { 817 RF_CallbackDesc_t *t, *cb; 818 819 #if RF_DEBUG_QUIESCE 820 if (rf_quiesceDebug) 821 printf("raid%d: Resuming new requests\n", raidPtr->raidid); 822 #endif 823 824 RF_LOCK_MUTEX(raidPtr->access_suspend_mutex); 825 raidPtr->accesses_suspended--; 826 if (raidPtr->accesses_suspended == 0) 827 cb = raidPtr->quiesce_wait_list; 828 else 829 cb = NULL; 830 raidPtr->quiesce_wait_list = NULL; 831 RF_UNLOCK_MUTEX(raidPtr->access_suspend_mutex); 832 833 while (cb) { 834 t = cb; 835 cb = cb->next; 836 (t->callbackFunc) (t->callbackArg); 837 rf_FreeCallbackDesc(t); 838 } 839 } 840 /***************************************************************************************** 841 * 842 * debug routines 843 * 844 ****************************************************************************************/ 845 846 static void 847 set_debug_option(char *name, long val) 848 { 849 RF_DebugName_t *p; 850 851 for (p = rf_debugNames; p->name; p++) { 852 if (!strcmp(p->name, name)) { 853 *(p->ptr) = val; 854 printf("[Set debug variable %s to %ld]\n", name, val); 855 return; 856 } 857 } 858 RF_ERRORMSG1("Unknown debug string \"%s\"\n", name); 859 } 860 861 862 /* would like to use sscanf here, but apparently not available in kernel */ 863 /*ARGSUSED*/ 864 static void 865 rf_ConfigureDebug(RF_Config_t *cfgPtr) 866 { 867 char *val_p, *name_p, *white_p; 868 long val; 869 int i; 870 871 rf_ResetDebugOptions(); 872 for (i = 0; cfgPtr->debugVars[i][0] && i < RF_MAXDBGV; i++) { 873 name_p = rf_find_non_white(&cfgPtr->debugVars[i][0]); 874 white_p = rf_find_white(name_p); /* skip to start of 2nd 875 * word */ 876 val_p = rf_find_non_white(white_p); 877 if (*val_p == '0' && *(val_p + 1) == 'x') 878 val = rf_htoi(val_p + 2); 879 else 880 val = rf_atoi(val_p); 881 *white_p = '\0'; 882 set_debug_option(name_p, val); 883 } 884 } 885 886 void 887 rf_print_panic_message(int line, const char *file) 888 { 889 snprintf(rf_panicbuf, sizeof(rf_panicbuf), 890 "raidframe error at line %d file %s", line, file); 891 } 892 893 #ifdef RAID_DIAGNOSTIC 894 void 895 rf_print_assert_panic_message(int line, const char *file, const char *condition) 896 { 897 snprintf(rf_panicbuf, sizeof(rf_panicbuf), 898 "raidframe error at line %d file %s (failed asserting %s)\n", 899 line, file, condition); 900 } 901 #endif 902 903 void 904 rf_print_unable_to_init_mutex(const char *file, int line, int rc) 905 { 906 RF_ERRORMSG3("Unable to init mutex file %s line %d rc=%d\n", 907 file, line, rc); 908 } 909 910 void 911 rf_print_unable_to_add_shutdown(const char *file, int line, int rc) 912 { 913 RF_ERRORMSG3("Unable to add to shutdown list file %s line %d rc=%d\n", 914 file, line, rc); 915 } 916