1 /* $NetBSD: rf_driver.c,v 1.115 2007/12/05 08:39:46 ad 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 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the NetBSD 20 * Foundation, Inc. and its contributors. 21 * 4. Neither the name of The NetBSD Foundation nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 26 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (c) 1995 Carnegie-Mellon University. 40 * All rights reserved. 41 * 42 * Author: Mark Holland, Khalil Amiri, Claudson Bornstein, William V. Courtright II, 43 * Robby Findler, Daniel Stodolsky, Rachad Youssef, Jim Zelenka 44 * 45 * Permission to use, copy, modify and distribute this software and 46 * its documentation is hereby granted, provided that both the copyright 47 * notice and this permission notice appear in all copies of the 48 * software, derivative works or modified versions, and any portions 49 * thereof, and that both notices appear in supporting documentation. 50 * 51 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 52 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 53 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 54 * 55 * Carnegie Mellon requests users of this software to return to 56 * 57 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 58 * School of Computer Science 59 * Carnegie Mellon University 60 * Pittsburgh PA 15213-3890 61 * 62 * any improvements or extensions that they make and grant Carnegie the 63 * rights to redistribute these changes. 64 */ 65 66 /****************************************************************************** 67 * 68 * rf_driver.c -- main setup, teardown, and access routines for the RAID driver 69 * 70 * all routines are prefixed with rf_ (raidframe), to avoid conficts. 71 * 72 ******************************************************************************/ 73 74 75 #include <sys/cdefs.h> 76 __KERNEL_RCSID(0, "$NetBSD: rf_driver.c,v 1.115 2007/12/05 08:39:46 ad Exp $"); 77 78 #include "opt_raid_diagnostic.h" 79 80 #include <sys/param.h> 81 #include <sys/systm.h> 82 #include <sys/ioctl.h> 83 #include <sys/fcntl.h> 84 #include <sys/vnode.h> 85 86 87 #include "rf_archs.h" 88 #include "rf_threadstuff.h" 89 90 #include <sys/errno.h> 91 92 #include "rf_raid.h" 93 #include "rf_dag.h" 94 #include "rf_aselect.h" 95 #include "rf_diskqueue.h" 96 #include "rf_parityscan.h" 97 #include "rf_alloclist.h" 98 #include "rf_dagutils.h" 99 #include "rf_utils.h" 100 #include "rf_etimer.h" 101 #include "rf_acctrace.h" 102 #include "rf_general.h" 103 #include "rf_desc.h" 104 #include "rf_states.h" 105 #include "rf_decluster.h" 106 #include "rf_map.h" 107 #include "rf_revent.h" 108 #include "rf_callback.h" 109 #include "rf_engine.h" 110 #include "rf_mcpair.h" 111 #include "rf_nwayxor.h" 112 #include "rf_copyback.h" 113 #include "rf_driver.h" 114 #include "rf_options.h" 115 #include "rf_shutdown.h" 116 #include "rf_kintf.h" 117 118 #include <sys/buf.h> 119 120 #ifndef RF_ACCESS_DEBUG 121 #define RF_ACCESS_DEBUG 0 122 #endif 123 124 /* rad == RF_RaidAccessDesc_t */ 125 RF_DECLARE_MUTEX(rf_rad_lock) 126 #define RF_MAX_FREE_RAD 128 127 #define RF_MIN_FREE_RAD 32 128 129 /* debug variables */ 130 char rf_panicbuf[2048]; /* a buffer to hold an error msg when we panic */ 131 132 /* main configuration routines */ 133 static int raidframe_booted = 0; 134 135 static void rf_ConfigureDebug(RF_Config_t * cfgPtr); 136 static void set_debug_option(char *name, long val); 137 static void rf_UnconfigureArray(void); 138 static void rf_ShutdownRDFreeList(void *); 139 static int rf_ConfigureRDFreeList(RF_ShutdownList_t **); 140 141 RF_DECLARE_MUTEX(rf_printf_mutex) /* debug only: avoids interleaved 142 * printfs by different stripes */ 143 144 #define SIGNAL_QUIESCENT_COND(_raid_) wakeup(&((_raid_)->accesses_suspended)) 145 #define WAIT_FOR_QUIESCENCE(_raid_) \ 146 ltsleep(&((_raid_)->accesses_suspended), PRIBIO, \ 147 "raidframe quiesce", 0, &((_raid_)->access_suspend_mutex)) 148 149 static int configureCount = 0; /* number of active configurations */ 150 static int isconfigged = 0; /* is basic raidframe (non per-array) 151 * stuff configged */ 152 RF_DECLARE_LKMGR_STATIC_MUTEX(configureMutex) /* used to lock the configuration 153 * stuff */ 154 static RF_ShutdownList_t *globalShutdown; /* non array-specific 155 * stuff */ 156 157 static int rf_ConfigureRDFreeList(RF_ShutdownList_t ** listp); 158 static int rf_AllocEmergBuffers(RF_Raid_t *); 159 static void rf_FreeEmergBuffers(RF_Raid_t *); 160 161 /* called at system boot time */ 162 int 163 rf_BootRaidframe() 164 { 165 166 if (raidframe_booted) 167 return (EBUSY); 168 raidframe_booted = 1; 169 mutex_init(&configureMutex, MUTEX_DEFAULT, IPL_NONE); 170 configureCount = 0; 171 isconfigged = 0; 172 globalShutdown = NULL; 173 return (0); 174 } 175 176 /* 177 * Called whenever an array is shutdown 178 */ 179 static void 180 rf_UnconfigureArray() 181 { 182 183 RF_LOCK_LKMGR_MUTEX(configureMutex); 184 if (--configureCount == 0) { /* if no active configurations, shut 185 * everything down */ 186 isconfigged = 0; 187 rf_ShutdownList(&globalShutdown); 188 189 /* 190 * We must wait until now, because the AllocList module 191 * uses the DebugMem module. 192 */ 193 #if RF_DEBUG_MEM 194 if (rf_memDebug) 195 rf_print_unfreed(); 196 #endif 197 } 198 RF_UNLOCK_LKMGR_MUTEX(configureMutex); 199 } 200 201 /* 202 * Called to shut down an array. 203 */ 204 int 205 rf_Shutdown(RF_Raid_t *raidPtr) 206 { 207 208 if (!raidPtr->valid) { 209 RF_ERRORMSG("Attempt to shut down unconfigured RAIDframe driver. Aborting shutdown\n"); 210 return (EINVAL); 211 } 212 /* 213 * wait for outstanding IOs to land 214 * As described in rf_raid.h, we use the rad_freelist lock 215 * to protect the per-array info about outstanding descs 216 * since we need to do freelist locking anyway, and this 217 * cuts down on the amount of serialization we've got going 218 * on. 219 */ 220 RF_LOCK_MUTEX(rf_rad_lock); 221 if (raidPtr->waitShutdown) { 222 RF_UNLOCK_MUTEX(rf_rad_lock); 223 return (EBUSY); 224 } 225 raidPtr->waitShutdown = 1; 226 while (raidPtr->nAccOutstanding) { 227 RF_WAIT_COND(raidPtr->outstandingCond, rf_rad_lock); 228 } 229 RF_UNLOCK_MUTEX(rf_rad_lock); 230 231 /* Wait for any parity re-writes to stop... */ 232 while (raidPtr->parity_rewrite_in_progress) { 233 printf("Waiting for parity re-write to exit...\n"); 234 tsleep(&raidPtr->parity_rewrite_in_progress, PRIBIO, 235 "rfprwshutdown", 0); 236 } 237 238 raidPtr->valid = 0; 239 240 rf_update_component_labels(raidPtr, RF_FINAL_COMPONENT_UPDATE); 241 242 rf_UnconfigureVnodes(raidPtr); 243 244 rf_FreeEmergBuffers(raidPtr); 245 246 rf_ShutdownList(&raidPtr->shutdownList); 247 248 rf_UnconfigureArray(); 249 250 return (0); 251 } 252 253 254 #define DO_INIT_CONFIGURE(f) { \ 255 rc = f (&globalShutdown); \ 256 if (rc) { \ 257 RF_ERRORMSG2("RAIDFRAME: failed %s with %d\n", RF_STRING(f), rc); \ 258 rf_ShutdownList(&globalShutdown); \ 259 configureCount--; \ 260 RF_UNLOCK_LKMGR_MUTEX(configureMutex); \ 261 return(rc); \ 262 } \ 263 } 264 265 #define DO_RAID_FAIL() { \ 266 rf_UnconfigureVnodes(raidPtr); \ 267 rf_FreeEmergBuffers(raidPtr); \ 268 rf_ShutdownList(&raidPtr->shutdownList); \ 269 rf_UnconfigureArray(); \ 270 } 271 272 #define DO_RAID_INIT_CONFIGURE(f) { \ 273 rc = f (&raidPtr->shutdownList, raidPtr, cfgPtr); \ 274 if (rc) { \ 275 RF_ERRORMSG2("RAIDFRAME: failed %s with %d\n", RF_STRING(f), rc); \ 276 DO_RAID_FAIL(); \ 277 return(rc); \ 278 } \ 279 } 280 281 #define DO_RAID_MUTEX(_m_) { \ 282 rf_mutex_init((_m_)); \ 283 } 284 285 int 286 rf_Configure(RF_Raid_t *raidPtr, RF_Config_t *cfgPtr, RF_AutoConfig_t *ac) 287 { 288 RF_RowCol_t col; 289 int rc; 290 291 RF_LOCK_LKMGR_MUTEX(configureMutex); 292 configureCount++; 293 if (isconfigged == 0) { 294 rf_mutex_init(&rf_printf_mutex); 295 296 /* initialize globals */ 297 298 DO_INIT_CONFIGURE(rf_ConfigureAllocList); 299 300 /* 301 * Yes, this does make debugging general to the whole 302 * system instead of being array specific. Bummer, drag. 303 */ 304 rf_ConfigureDebug(cfgPtr); 305 DO_INIT_CONFIGURE(rf_ConfigureDebugMem); 306 #if RF_ACC_TRACE > 0 307 DO_INIT_CONFIGURE(rf_ConfigureAccessTrace); 308 #endif 309 DO_INIT_CONFIGURE(rf_ConfigureMapModule); 310 DO_INIT_CONFIGURE(rf_ConfigureReconEvent); 311 DO_INIT_CONFIGURE(rf_ConfigureCallback); 312 DO_INIT_CONFIGURE(rf_ConfigureRDFreeList); 313 DO_INIT_CONFIGURE(rf_ConfigureNWayXor); 314 DO_INIT_CONFIGURE(rf_ConfigureStripeLockFreeList); 315 DO_INIT_CONFIGURE(rf_ConfigureMCPair); 316 DO_INIT_CONFIGURE(rf_ConfigureDAGs); 317 DO_INIT_CONFIGURE(rf_ConfigureDAGFuncs); 318 DO_INIT_CONFIGURE(rf_ConfigureReconstruction); 319 DO_INIT_CONFIGURE(rf_ConfigureCopyback); 320 DO_INIT_CONFIGURE(rf_ConfigureDiskQueueSystem); 321 DO_INIT_CONFIGURE(rf_ConfigurePSStatus); 322 isconfigged = 1; 323 } 324 RF_UNLOCK_LKMGR_MUTEX(configureMutex); 325 326 DO_RAID_MUTEX(&raidPtr->mutex); 327 /* set up the cleanup list. Do this after ConfigureDebug so that 328 * value of memDebug will be set */ 329 330 rf_MakeAllocList(raidPtr->cleanupList); 331 if (raidPtr->cleanupList == NULL) { 332 DO_RAID_FAIL(); 333 return (ENOMEM); 334 } 335 rf_ShutdownCreate(&raidPtr->shutdownList, 336 (void (*) (void *)) rf_FreeAllocList, 337 raidPtr->cleanupList); 338 339 raidPtr->numCol = cfgPtr->numCol; 340 raidPtr->numSpare = cfgPtr->numSpare; 341 342 raidPtr->status = rf_rs_optimal; 343 raidPtr->reconControl = NULL; 344 345 TAILQ_INIT(&(raidPtr->iodone)); 346 simple_lock_init(&(raidPtr->iodone_lock)); 347 348 DO_RAID_INIT_CONFIGURE(rf_ConfigureEngine); 349 DO_RAID_INIT_CONFIGURE(rf_ConfigureStripeLocks); 350 351 raidPtr->outstandingCond = 0; 352 353 raidPtr->nAccOutstanding = 0; 354 raidPtr->waitShutdown = 0; 355 356 DO_RAID_MUTEX(&raidPtr->access_suspend_mutex); 357 358 raidPtr->waitForReconCond = 0; 359 360 if (ac!=NULL) { 361 /* We have an AutoConfig structure.. Don't do the 362 normal disk configuration... call the auto config 363 stuff */ 364 rf_AutoConfigureDisks(raidPtr, cfgPtr, ac); 365 } else { 366 DO_RAID_INIT_CONFIGURE(rf_ConfigureDisks); 367 DO_RAID_INIT_CONFIGURE(rf_ConfigureSpareDisks); 368 } 369 /* do this after ConfigureDisks & ConfigureSpareDisks to be sure dev 370 * no. is set */ 371 DO_RAID_INIT_CONFIGURE(rf_ConfigureDiskQueues); 372 373 DO_RAID_INIT_CONFIGURE(rf_ConfigureLayout); 374 375 /* Initialize per-RAID PSS bits */ 376 rf_InitPSStatus(raidPtr); 377 378 #if RF_INCLUDE_CHAINDECLUSTER > 0 379 for (col = 0; col < raidPtr->numCol; col++) { 380 /* 381 * XXX better distribution 382 */ 383 raidPtr->hist_diskreq[col] = 0; 384 } 385 #endif 386 raidPtr->numNewFailures = 0; 387 raidPtr->copyback_in_progress = 0; 388 raidPtr->parity_rewrite_in_progress = 0; 389 raidPtr->adding_hot_spare = 0; 390 raidPtr->recon_in_progress = 0; 391 raidPtr->maxOutstanding = cfgPtr->maxOutstandingDiskReqs; 392 393 /* autoconfigure and root_partition will actually get filled in 394 after the config is done */ 395 raidPtr->autoconfigure = 0; 396 raidPtr->root_partition = 0; 397 raidPtr->last_unit = raidPtr->raidid; 398 raidPtr->config_order = 0; 399 400 if (rf_keepAccTotals) { 401 raidPtr->keep_acc_totals = 1; 402 } 403 404 /* Allocate a bunch of buffers to be used in low-memory conditions */ 405 raidPtr->iobuf = NULL; 406 407 rc = rf_AllocEmergBuffers(raidPtr); 408 if (rc) { 409 printf("raid%d: Unable to allocate emergency buffers.\n", 410 raidPtr->raidid); 411 DO_RAID_FAIL(); 412 return(rc); 413 } 414 415 raidPtr->valid = 1; 416 417 printf("raid%d: %s\n", raidPtr->raidid, 418 raidPtr->Layout.map->configName); 419 printf("raid%d: Components:", raidPtr->raidid); 420 421 for (col = 0; col < raidPtr->numCol; col++) { 422 printf(" %s", raidPtr->Disks[col].devname); 423 if (RF_DEAD_DISK(raidPtr->Disks[col].status)) { 424 printf("[**FAILED**]"); 425 } 426 } 427 printf("\n"); 428 printf("raid%d: Total Sectors: %lu (%lu MB)\n", 429 raidPtr->raidid, 430 (unsigned long) raidPtr->totalSectors, 431 (unsigned long) (raidPtr->totalSectors / 1024 * 432 (1 << raidPtr->logBytesPerSector) / 1024)); 433 434 return (0); 435 } 436 437 438 /* 439 440 Routines to allocate and free the "emergency buffers" for a given 441 RAID set. These emergency buffers will be used when the kernel runs 442 out of kernel memory. 443 444 */ 445 446 static int 447 rf_AllocEmergBuffers(RF_Raid_t *raidPtr) 448 { 449 void *tmpbuf; 450 RF_VoidPointerListElem_t *vple; 451 int i; 452 453 /* XXX next line needs tuning... */ 454 raidPtr->numEmergencyBuffers = 10 * raidPtr->numCol; 455 #if DEBUG 456 printf("raid%d: allocating %d buffers of %d bytes.\n", 457 raidPtr->raidid, 458 raidPtr->numEmergencyBuffers, 459 (int)(raidPtr->Layout.sectorsPerStripeUnit << 460 raidPtr->logBytesPerSector)); 461 #endif 462 for (i = 0; i < raidPtr->numEmergencyBuffers; i++) { 463 tmpbuf = malloc( raidPtr->Layout.sectorsPerStripeUnit << 464 raidPtr->logBytesPerSector, 465 M_RAIDFRAME, M_WAITOK); 466 if (tmpbuf) { 467 vple = rf_AllocVPListElem(); 468 vple->p= tmpbuf; 469 vple->next = raidPtr->iobuf; 470 raidPtr->iobuf = vple; 471 raidPtr->iobuf_count++; 472 } else { 473 printf("raid%d: failed to allocate emergency buffer!\n", 474 raidPtr->raidid); 475 return 1; 476 } 477 } 478 479 /* XXX next line needs tuning too... */ 480 raidPtr->numEmergencyStripeBuffers = 10; 481 for (i = 0; i < raidPtr->numEmergencyStripeBuffers; i++) { 482 tmpbuf = malloc( raidPtr->numCol * (raidPtr->Layout.sectorsPerStripeUnit << 483 raidPtr->logBytesPerSector), 484 M_RAIDFRAME, M_WAITOK); 485 if (tmpbuf) { 486 vple = rf_AllocVPListElem(); 487 vple->p= tmpbuf; 488 vple->next = raidPtr->stripebuf; 489 raidPtr->stripebuf = vple; 490 raidPtr->stripebuf_count++; 491 } else { 492 printf("raid%d: failed to allocate emergency stripe buffer!\n", 493 raidPtr->raidid); 494 return 1; 495 } 496 } 497 498 return (0); 499 } 500 501 static void 502 rf_FreeEmergBuffers(RF_Raid_t *raidPtr) 503 { 504 RF_VoidPointerListElem_t *tmp; 505 506 /* Free the emergency IO buffers */ 507 while (raidPtr->iobuf != NULL) { 508 tmp = raidPtr->iobuf; 509 raidPtr->iobuf = raidPtr->iobuf->next; 510 free(tmp->p, M_RAIDFRAME); 511 rf_FreeVPListElem(tmp); 512 } 513 514 /* Free the emergency stripe buffers */ 515 while (raidPtr->stripebuf != NULL) { 516 tmp = raidPtr->stripebuf; 517 raidPtr->stripebuf = raidPtr->stripebuf->next; 518 free(tmp->p, M_RAIDFRAME); 519 rf_FreeVPListElem(tmp); 520 } 521 } 522 523 524 static void 525 rf_ShutdownRDFreeList(void *ignored) 526 { 527 pool_destroy(&rf_pools.rad); 528 } 529 530 static int 531 rf_ConfigureRDFreeList(RF_ShutdownList_t **listp) 532 { 533 534 rf_pool_init(&rf_pools.rad, sizeof(RF_RaidAccessDesc_t), 535 "rf_rad_pl", RF_MIN_FREE_RAD, RF_MAX_FREE_RAD); 536 rf_ShutdownCreate(listp, rf_ShutdownRDFreeList, NULL); 537 simple_lock_init(&rf_rad_lock); 538 return (0); 539 } 540 541 RF_RaidAccessDesc_t * 542 rf_AllocRaidAccDesc(RF_Raid_t *raidPtr, RF_IoType_t type, 543 RF_RaidAddr_t raidAddress, RF_SectorCount_t numBlocks, 544 void *bufPtr, void *bp, RF_RaidAccessFlags_t flags, 545 const RF_AccessState_t *states) 546 { 547 RF_RaidAccessDesc_t *desc; 548 549 desc = pool_get(&rf_pools.rad, PR_WAITOK); 550 551 RF_LOCK_MUTEX(rf_rad_lock); 552 if (raidPtr->waitShutdown) { 553 /* 554 * Actually, we're shutting the array down. Free the desc 555 * and return NULL. 556 */ 557 558 RF_UNLOCK_MUTEX(rf_rad_lock); 559 pool_put(&rf_pools.rad, desc); 560 return (NULL); 561 } 562 raidPtr->nAccOutstanding++; 563 564 RF_UNLOCK_MUTEX(rf_rad_lock); 565 566 desc->raidPtr = (void *) raidPtr; 567 desc->type = type; 568 desc->raidAddress = raidAddress; 569 desc->numBlocks = numBlocks; 570 desc->bufPtr = bufPtr; 571 desc->bp = bp; 572 desc->flags = flags; 573 desc->states = states; 574 desc->state = 0; 575 desc->dagList = NULL; 576 577 desc->status = 0; 578 desc->numRetries = 0; 579 #if RF_ACC_TRACE > 0 580 memset((char *) &desc->tracerec, 0, sizeof(RF_AccTraceEntry_t)); 581 #endif 582 desc->callbackFunc = NULL; 583 desc->callbackArg = NULL; 584 desc->next = NULL; 585 desc->iobufs = NULL; 586 desc->stripebufs = NULL; 587 588 return (desc); 589 } 590 591 void 592 rf_FreeRaidAccDesc(RF_RaidAccessDesc_t *desc) 593 { 594 RF_Raid_t *raidPtr = desc->raidPtr; 595 RF_DagList_t *dagList, *temp; 596 RF_VoidPointerListElem_t *tmp; 597 598 RF_ASSERT(desc); 599 600 /* Cleanup the dagList(s) */ 601 dagList = desc->dagList; 602 while(dagList != NULL) { 603 temp = dagList; 604 dagList = dagList->next; 605 rf_FreeDAGList(temp); 606 } 607 608 while (desc->iobufs) { 609 tmp = desc->iobufs; 610 desc->iobufs = desc->iobufs->next; 611 rf_FreeIOBuffer(raidPtr, tmp); 612 } 613 614 while (desc->stripebufs) { 615 tmp = desc->stripebufs; 616 desc->stripebufs = desc->stripebufs->next; 617 rf_FreeStripeBuffer(raidPtr, tmp); 618 } 619 620 pool_put(&rf_pools.rad, desc); 621 RF_LOCK_MUTEX(rf_rad_lock); 622 raidPtr->nAccOutstanding--; 623 if (raidPtr->waitShutdown) { 624 RF_SIGNAL_COND(raidPtr->outstandingCond); 625 } 626 RF_UNLOCK_MUTEX(rf_rad_lock); 627 } 628 /********************************************************************* 629 * Main routine for performing an access. 630 * Accesses are retried until a DAG can not be selected. This occurs 631 * when either the DAG library is incomplete or there are too many 632 * failures in a parity group. 633 * 634 * type should be read or write async_flag should be RF_TRUE or 635 * RF_FALSE bp_in is a buf pointer. void *to facilitate ignoring it 636 * outside the kernel 637 ********************************************************************/ 638 int 639 rf_DoAccess(RF_Raid_t * raidPtr, RF_IoType_t type, int async_flag, 640 RF_RaidAddr_t raidAddress, RF_SectorCount_t numBlocks, 641 void *bufPtr, struct buf *bp, RF_RaidAccessFlags_t flags) 642 { 643 RF_RaidAccessDesc_t *desc; 644 void *lbufPtr = bufPtr; 645 646 raidAddress += rf_raidSectorOffset; 647 648 #if RF_ACCESS_DEBUG 649 if (rf_accessDebug) { 650 651 printf("logBytes is: %d %d %d\n", raidPtr->raidid, 652 raidPtr->logBytesPerSector, 653 (int) rf_RaidAddressToByte(raidPtr, numBlocks)); 654 printf("raid%d: %s raidAddr %d (stripeid %d-%d) numBlocks %d (%d bytes) buf 0x%lx\n", raidPtr->raidid, 655 (type == RF_IO_TYPE_READ) ? "READ" : "WRITE", (int) raidAddress, 656 (int) rf_RaidAddressToStripeID(&raidPtr->Layout, raidAddress), 657 (int) rf_RaidAddressToStripeID(&raidPtr->Layout, raidAddress + numBlocks - 1), 658 (int) numBlocks, 659 (int) rf_RaidAddressToByte(raidPtr, numBlocks), 660 (long) bufPtr); 661 } 662 #endif 663 664 desc = rf_AllocRaidAccDesc(raidPtr, type, raidAddress, 665 numBlocks, lbufPtr, bp, flags, raidPtr->Layout.map->states); 666 667 if (desc == NULL) { 668 return (ENOMEM); 669 } 670 #if RF_ACC_TRACE > 0 671 RF_ETIMER_START(desc->tracerec.tot_timer); 672 #endif 673 desc->async_flag = async_flag; 674 675 rf_ContinueRaidAccess(desc); 676 677 return (0); 678 } 679 #if 0 680 /* force the array into reconfigured mode without doing reconstruction */ 681 int 682 rf_SetReconfiguredMode(RF_Raid_t *raidPtr, int col) 683 { 684 if (!(raidPtr->Layout.map->flags & RF_DISTRIBUTE_SPARE)) { 685 printf("Can't set reconfigured mode in dedicated-spare array\n"); 686 RF_PANIC(); 687 } 688 RF_LOCK_MUTEX(raidPtr->mutex); 689 raidPtr->numFailures++; 690 raidPtr->Disks[col].status = rf_ds_dist_spared; 691 raidPtr->status = rf_rs_reconfigured; 692 rf_update_component_labels(raidPtr, RF_NORMAL_COMPONENT_UPDATE); 693 /* install spare table only if declustering + distributed sparing 694 * architecture. */ 695 if (raidPtr->Layout.map->flags & RF_BD_DECLUSTERED) 696 rf_InstallSpareTable(raidPtr, col); 697 RF_UNLOCK_MUTEX(raidPtr->mutex); 698 return (0); 699 } 700 #endif 701 702 int 703 rf_FailDisk(RF_Raid_t *raidPtr, int fcol, int initRecon) 704 { 705 706 /* need to suspend IO's here -- if there are DAGs in flight 707 and we pull the rug out from under ci_vp, Bad Things 708 can happen. */ 709 710 rf_SuspendNewRequestsAndWait(raidPtr); 711 712 RF_LOCK_MUTEX(raidPtr->mutex); 713 if (raidPtr->Disks[fcol].status != rf_ds_failed) { 714 /* must be failing something that is valid, or else it's 715 already marked as failed (in which case we don't 716 want to mark it failed again!) */ 717 raidPtr->numFailures++; 718 raidPtr->Disks[fcol].status = rf_ds_failed; 719 raidPtr->status = rf_rs_degraded; 720 } 721 RF_UNLOCK_MUTEX(raidPtr->mutex); 722 723 rf_update_component_labels(raidPtr, RF_NORMAL_COMPONENT_UPDATE); 724 725 /* Close the component, so that it's not "locked" if someone 726 else want's to use it! */ 727 728 rf_close_component(raidPtr, raidPtr->raid_cinfo[fcol].ci_vp, 729 raidPtr->Disks[fcol].auto_configured); 730 731 RF_LOCK_MUTEX(raidPtr->mutex); 732 raidPtr->raid_cinfo[fcol].ci_vp = NULL; 733 734 /* Need to mark the component as not being auto_configured 735 (in case it was previously). */ 736 737 raidPtr->Disks[fcol].auto_configured = 0; 738 RF_UNLOCK_MUTEX(raidPtr->mutex); 739 /* now we can allow IO to continue -- we'll be suspending it 740 again in rf_ReconstructFailedDisk() if we have to.. */ 741 742 rf_ResumeNewRequests(raidPtr); 743 744 if (initRecon) 745 rf_ReconstructFailedDisk(raidPtr, fcol); 746 return (0); 747 } 748 /* releases a thread that is waiting for the array to become quiesced. 749 * access_suspend_mutex should be locked upon calling this 750 */ 751 void 752 rf_SignalQuiescenceLock(RF_Raid_t *raidPtr) 753 { 754 #if RF_DEBUG_QUIESCE 755 if (rf_quiesceDebug) { 756 printf("raid%d: Signalling quiescence lock\n", 757 raidPtr->raidid); 758 } 759 #endif 760 raidPtr->access_suspend_release = 1; 761 762 if (raidPtr->waiting_for_quiescence) { 763 SIGNAL_QUIESCENT_COND(raidPtr); 764 } 765 } 766 /* suspends all new requests to the array. No effect on accesses that are in flight. */ 767 int 768 rf_SuspendNewRequestsAndWait(RF_Raid_t *raidPtr) 769 { 770 #if RF_DEBUG_QUIESCE 771 if (rf_quiesceDebug) 772 printf("raid%d: Suspending new reqs\n", raidPtr->raidid); 773 #endif 774 RF_LOCK_MUTEX(raidPtr->access_suspend_mutex); 775 raidPtr->accesses_suspended++; 776 raidPtr->waiting_for_quiescence = (raidPtr->accs_in_flight == 0) ? 0 : 1; 777 778 if (raidPtr->waiting_for_quiescence) { 779 raidPtr->access_suspend_release = 0; 780 while (!raidPtr->access_suspend_release) { 781 #if RF_DEBUG_QUIESCE 782 printf("raid%d: Suspending: Waiting for Quiescence\n", 783 raidPtr->raidid); 784 #endif 785 WAIT_FOR_QUIESCENCE(raidPtr); 786 raidPtr->waiting_for_quiescence = 0; 787 } 788 } 789 #if RF_DEBUG_QUIESCE 790 printf("raid%d: Quiescence reached..\n", raidPtr->raidid); 791 #endif 792 793 RF_UNLOCK_MUTEX(raidPtr->access_suspend_mutex); 794 return (raidPtr->waiting_for_quiescence); 795 } 796 /* wake up everyone waiting for quiescence to be released */ 797 void 798 rf_ResumeNewRequests(RF_Raid_t *raidPtr) 799 { 800 RF_CallbackDesc_t *t, *cb; 801 802 #if RF_DEBUG_QUIESCE 803 if (rf_quiesceDebug) 804 printf("Resuming new reqs\n"); 805 #endif 806 807 RF_LOCK_MUTEX(raidPtr->access_suspend_mutex); 808 raidPtr->accesses_suspended--; 809 if (raidPtr->accesses_suspended == 0) 810 cb = raidPtr->quiesce_wait_list; 811 else 812 cb = NULL; 813 raidPtr->quiesce_wait_list = NULL; 814 RF_UNLOCK_MUTEX(raidPtr->access_suspend_mutex); 815 816 while (cb) { 817 t = cb; 818 cb = cb->next; 819 (t->callbackFunc) (t->callbackArg); 820 rf_FreeCallbackDesc(t); 821 } 822 } 823 /***************************************************************************************** 824 * 825 * debug routines 826 * 827 ****************************************************************************************/ 828 829 static void 830 set_debug_option(char *name, long val) 831 { 832 RF_DebugName_t *p; 833 834 for (p = rf_debugNames; p->name; p++) { 835 if (!strcmp(p->name, name)) { 836 *(p->ptr) = val; 837 printf("[Set debug variable %s to %ld]\n", name, val); 838 return; 839 } 840 } 841 RF_ERRORMSG1("Unknown debug string \"%s\"\n", name); 842 } 843 844 845 /* would like to use sscanf here, but apparently not available in kernel */ 846 /*ARGSUSED*/ 847 static void 848 rf_ConfigureDebug(RF_Config_t *cfgPtr) 849 { 850 char *val_p, *name_p, *white_p; 851 long val; 852 int i; 853 854 rf_ResetDebugOptions(); 855 for (i = 0; cfgPtr->debugVars[i][0] && i < RF_MAXDBGV; i++) { 856 name_p = rf_find_non_white(&cfgPtr->debugVars[i][0]); 857 white_p = rf_find_white(name_p); /* skip to start of 2nd 858 * word */ 859 val_p = rf_find_non_white(white_p); 860 if (*val_p == '0' && *(val_p + 1) == 'x') 861 val = rf_htoi(val_p + 2); 862 else 863 val = rf_atoi(val_p); 864 *white_p = '\0'; 865 set_debug_option(name_p, val); 866 } 867 } 868 869 void 870 rf_print_panic_message(int line, const char *file) 871 { 872 snprintf(rf_panicbuf, sizeof(rf_panicbuf), 873 "raidframe error at line %d file %s", line, file); 874 } 875 876 #ifdef RAID_DIAGNOSTIC 877 void 878 rf_print_assert_panic_message(int line, const char *file, const char *condition) 879 { 880 snprintf(rf_panicbuf, sizeof(rf_panicbuf), 881 "raidframe error at line %d file %s (failed asserting %s)\n", 882 line, file, condition); 883 } 884 #endif 885 886 void 887 rf_print_unable_to_init_mutex(const char *file, int line, int rc) 888 { 889 RF_ERRORMSG3("Unable to init mutex file %s line %d rc=%d\n", 890 file, line, rc); 891 } 892 893 void 894 rf_print_unable_to_add_shutdown(const char *file, int line, int rc) 895 { 896 RF_ERRORMSG3("Unable to add to shutdown list file %s line %d rc=%d\n", 897 file, line, rc); 898 } 899