1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* 28 * NAME: raid.c 29 * 30 * DESCRIPTION: Main RAID driver source file containing open, close and I/O 31 * operations. 32 * 33 * ROUTINES PROVIDED FOR EXTERNAL USE: 34 * raid_open() - open the RAID metadevice for access. 35 * raid_internal_open() - internal open routine of RAID metdevice. 36 * md_raid_strategy() - perform normal I/O operations, 37 * such as read and write. 38 * raid_close() - close the RAID metadevice. 39 * raid_internal_close() - internal close routine of RAID metadevice. 40 * raid_snarf() - initialize and clean up MDD records. 41 * raid_halt() - reset the RAID metadevice 42 * raid_line() - return the line # of this segment 43 * raid_dcolumn() - return the data column # of this segment 44 * raid_pcolumn() - return the parity column # of this segment 45 */ 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/conf.h> 50 #include <sys/file.h> 51 #include <sys/user.h> 52 #include <sys/uio.h> 53 #include <sys/t_lock.h> 54 #include <sys/buf.h> 55 #include <sys/dkio.h> 56 #include <sys/vtoc.h> 57 #include <sys/kmem.h> 58 #include <vm/page.h> 59 #include <sys/cmn_err.h> 60 #include <sys/sysmacros.h> 61 #include <sys/types.h> 62 #include <sys/mkdev.h> 63 #include <sys/stat.h> 64 #include <sys/open.h> 65 #include <sys/modctl.h> 66 #include <sys/ddi.h> 67 #include <sys/sunddi.h> 68 #include <sys/debug.h> 69 #include <sys/lvm/md_raid.h> 70 #include <sys/lvm/mdvar.h> 71 #include <sys/lvm/md_convert.h> 72 73 #include <sys/sysevent/eventdefs.h> 74 #include <sys/sysevent/svm.h> 75 76 md_ops_t raid_md_ops; 77 #ifndef lint 78 char _depends_on[] = "drv/md"; 79 md_ops_t *md_interface_ops = &raid_md_ops; 80 #endif /* lint */ 81 82 extern unit_t md_nunits; 83 extern unit_t md_nsets; 84 extern md_set_t md_set[]; 85 extern int md_status; 86 extern major_t md_major; 87 extern mdq_anchor_t md_done_daemon; 88 extern mdq_anchor_t md_mstr_daemon; 89 extern int md_sleep_for_test; 90 extern clock_t md_hz; 91 92 extern md_event_queue_t *md_event_queue; 93 94 95 int pchunks = 16; 96 int phigh = 1024; 97 int plow = 128; 98 int cchunks = 64; 99 int chigh = 1024; 100 int clow = 512; 101 int bchunks = 32; 102 int bhigh = 256; 103 int blow = 128; 104 105 int raid_total_io = 0; 106 int raid_reads = 0; 107 int raid_writes = 0; 108 int raid_no_bpmaps = 0; 109 int raid_512 = 0; 110 int raid_1024 = 0; 111 int raid_1024_8192 = 0; 112 int raid_8192 = 0; 113 int raid_8192_bigger = 0; 114 int raid_line_lock_wait = 0; 115 116 int data_buffer_waits = 0; 117 int parity_buffer_waits = 0; 118 119 /* writer line locks */ 120 int raid_writer_locks = 0; /* total writer locks */ 121 int raid_write_waits = 0; /* total writer locks that waited */ 122 int raid_full_line_writes = 0; /* total full line writes */ 123 int raid_write_queue_length = 0; /* wait queue length */ 124 int raid_max_write_q_length = 0; /* maximum queue length */ 125 int raid_write_locks_active = 0; /* writer locks at any time */ 126 int raid_max_write_locks = 0; /* maximum writer locks active */ 127 128 /* read line locks */ 129 int raid_reader_locks = 0; /* total reader locks held */ 130 int raid_reader_locks_active = 0; /* reader locks held */ 131 int raid_max_reader_locks = 0; /* maximum reader locks held in run */ 132 int raid_read_overlaps = 0; /* number of times 2 reads hit same line */ 133 int raid_read_waits = 0; /* times a reader waited on writer */ 134 135 /* prewrite stats */ 136 int raid_prewrite_waits = 0; /* number of waits for a pw slot */ 137 int raid_pw = 0; /* number of pw slots in use */ 138 int raid_prewrite_max = 0; /* maximum number of pw slots in use */ 139 int raid_pw_invalidates = 0; 140 141 static clock_t md_wr_wait = 0; 142 143 int nv_available = 0; /* presence of nv-ram support in device */ 144 int nv_prewrite = 1; /* mark prewrites with nv_available */ 145 int nv_parity = 1; /* mark parity with nv_available */ 146 147 kmem_cache_t *raid_parent_cache = NULL; 148 kmem_cache_t *raid_child_cache = NULL; 149 kmem_cache_t *raid_cbuf_cache = NULL; 150 151 int raid_internal_open(minor_t mnum, int flag, int otyp, 152 int md_oflags); 153 154 static void freebuffers(md_raidcs_t *cs); 155 static int raid_read(mr_unit_t *un, md_raidcs_t *cs); 156 static void raid_read_io(mr_unit_t *un, md_raidcs_t *cs); 157 static int raid_write(mr_unit_t *un, md_raidcs_t *cs); 158 static void raid_write_io(mr_unit_t *un, md_raidcs_t *cs); 159 static void raid_stage(md_raidcs_t *cs); 160 static void raid_enqueue(md_raidcs_t *cs); 161 static diskaddr_t raid_line(diskaddr_t segment, mr_unit_t *un); 162 uint_t raid_dcolumn(diskaddr_t segment, mr_unit_t *un); 163 static void getpbuffer(md_raidcs_t *cs); 164 static void getdbuffer(md_raidcs_t *cs); 165 static void raid_done(buf_t *bp); 166 static void raid_io_startup(mr_unit_t *un); 167 168 static rus_state_t 169 raid_col2unit(rcs_state_t state, rus_state_t unitstate) 170 { 171 switch (state) { 172 case RCS_INIT: 173 return (RUS_INIT); 174 case RCS_OKAY: 175 return (RUS_OKAY); 176 case RCS_RESYNC: 177 if (unitstate & RUS_LAST_ERRED) 178 return (RUS_LAST_ERRED); 179 else 180 return (RUS_ERRED); 181 case RCS_ERRED: 182 return (RUS_ERRED); 183 case RCS_LAST_ERRED: 184 return (RUS_ERRED); 185 default: 186 break; 187 } 188 panic("raid_col2unit"); 189 /*NOTREACHED*/ 190 } 191 192 void 193 raid_set_state(mr_unit_t *un, int col, rcs_state_t newstate, int force) 194 { 195 196 rus_state_t unitstate, origstate; 197 rcs_state_t colstate; 198 rcs_state_t orig_colstate; 199 int errcnt = 0, okaycnt = 0, resynccnt = 0; 200 int i; 201 char *devname; 202 203 ASSERT(un); 204 ASSERT(col < un->un_totalcolumncnt); 205 ASSERT(newstate & 206 (RCS_INIT | RCS_INIT_ERRED | RCS_OKAY | RCS_RESYNC | RCS_ERRED | 207 RCS_LAST_ERRED | RCS_REGEN)); 208 ASSERT((newstate & 209 ~(RCS_INIT | RCS_INIT_ERRED | RCS_OKAY | RCS_RESYNC | RCS_ERRED | 210 RCS_LAST_ERRED | RCS_REGEN)) 211 == 0); 212 213 ASSERT(MDI_UNIT(MD_SID(un)) ? UNIT_WRITER_HELD(un) : 1); 214 215 unitstate = un->un_state; 216 origstate = unitstate; 217 218 if (force) { 219 un->un_column[col].un_devstate = newstate; 220 un->un_state = raid_col2unit(newstate, unitstate); 221 uniqtime32(&un->un_column[col].un_devtimestamp); 222 uniqtime32(&un->un_timestamp); 223 return; 224 } 225 226 ASSERT(un->un_state & 227 (RUS_INIT | RUS_OKAY | RUS_ERRED | RUS_DOI | RUS_LAST_ERRED | 228 RUS_REGEN)); 229 ASSERT((un->un_state & ~(RUS_INIT | 230 RUS_OKAY | RUS_ERRED | RUS_DOI | RUS_LAST_ERRED | RUS_REGEN)) == 0); 231 232 if (un->un_column[col].un_devstate == newstate) 233 return; 234 235 if (newstate == RCS_REGEN) { 236 if (raid_state_cnt(un, RCS_OKAY) != un->un_totalcolumncnt) 237 return; 238 un->un_state = RUS_REGEN; 239 return; 240 } 241 242 orig_colstate = un->un_column[col].un_devstate; 243 244 /* 245 * if there is another column in the error state then this 246 * column should go to the last errored state 247 */ 248 for (i = 0; i < un->un_totalcolumncnt; i++) { 249 if (i == col) 250 colstate = newstate; 251 else 252 colstate = un->un_column[i].un_devstate; 253 if (colstate & (RCS_ERRED | RCS_LAST_ERRED | RCS_INIT_ERRED)) 254 errcnt++; 255 if (colstate & RCS_OKAY) 256 okaycnt++; 257 if (colstate & RCS_RESYNC) 258 resynccnt++; 259 } 260 ASSERT(resynccnt < 2); 261 262 if (okaycnt == un->un_totalcolumncnt) 263 unitstate = RUS_OKAY; 264 else if (errcnt > 1) { 265 unitstate = RUS_LAST_ERRED; 266 if (newstate & RCS_ERRED) 267 newstate = RCS_LAST_ERRED; 268 } else if (errcnt == 1) 269 if (!(unitstate & RUS_LAST_ERRED)) 270 unitstate = RUS_ERRED; 271 272 if (un->un_state == RUS_DOI) 273 unitstate = RUS_DOI; 274 275 un->un_column[col].un_devstate = newstate; 276 uniqtime32(&un->un_column[col].un_devtimestamp); 277 /* 278 * if there are last errored column being brought back online 279 * by open or snarf, then be sure to clear the RUS_LAST_ERRED 280 * bit to allow writes. If there is a real error then the 281 * column will go back into last erred. 282 */ 283 if ((raid_state_cnt(un, RCS_LAST_ERRED) == 0) && 284 (raid_state_cnt(un, RCS_ERRED) == 1)) 285 unitstate = RUS_ERRED; 286 287 un->un_state = unitstate; 288 uniqtime32(&un->un_timestamp); 289 290 if ((! (origstate & (RUS_ERRED|RUS_LAST_ERRED|RUS_DOI))) && 291 (unitstate & (RUS_ERRED|RUS_LAST_ERRED|RUS_DOI))) { 292 devname = md_devname(MD_UN2SET(un), 293 un->un_column[col].un_dev, NULL, 0); 294 295 cmn_err(CE_WARN, "md: %s: %s needs maintenance", 296 md_shortname(MD_SID(un)), devname); 297 298 if (unitstate & RUS_LAST_ERRED) { 299 cmn_err(CE_WARN, "md: %s: %s last erred", 300 md_shortname(MD_SID(un)), devname); 301 302 } else if (un->un_column[col].un_devflags & 303 MD_RAID_DEV_ISOPEN) { 304 /* 305 * Close the broken device and clear the open flag on 306 * it. We have to check that the device is open, 307 * otherwise the first open on it has resulted in the 308 * error that is being processed and the actual un_dev 309 * will be NODEV64. 310 */ 311 md_layered_close(un->un_column[col].un_dev, 312 MD_OFLG_NULL); 313 un->un_column[col].un_devflags &= ~MD_RAID_DEV_ISOPEN; 314 } 315 } else if (orig_colstate == RCS_LAST_ERRED && newstate == RCS_ERRED && 316 un->un_column[col].un_devflags & MD_RAID_DEV_ISOPEN) { 317 /* 318 * Similar to logic above except no log messages since we 319 * are just transitioning from Last Erred to Erred. 320 */ 321 md_layered_close(un->un_column[col].un_dev, MD_OFLG_NULL); 322 un->un_column[col].un_devflags &= ~MD_RAID_DEV_ISOPEN; 323 } 324 325 /* 326 * If a resync has completed, see if there is a Last Erred 327 * component that we can change to the Erred state. 328 */ 329 if ((orig_colstate == RCS_RESYNC) && (newstate == RCS_OKAY)) { 330 for (i = 0; i < un->un_totalcolumncnt; i++) { 331 if (i != col && 332 (un->un_column[i].un_devstate & RCS_LAST_ERRED)) { 333 raid_set_state(un, i, RCS_ERRED, 0); 334 break; 335 } 336 } 337 } 338 } 339 340 /* 341 * NAME: erred_check_line 342 * 343 * DESCRIPTION: Return the type of write to perform on an erred column based 344 * upon any resync activity. 345 * 346 * if a column is being resynced and the write is above the 347 * resync point may have to write to the target being resynced. 348 * 349 * Column state may make it impossible to do the write 350 * in which case RCL_EIO or RCL_ENXIO is returned. 351 * 352 * If a column cannot be written directly, RCL_ERRED is 353 * returned and processing should proceed accordingly. 354 * 355 * PARAMETERS: minor_t mnum - minor number identity of metadevice 356 * md_raidcs_t *cs - child save structure 357 * mr_column_t *dcolumn - pointer to data column structure 358 * mr_column_t *pcolumn - pointer to parity column structure 359 * 360 * RETURNS: RCL_OKAY, RCL_ERRED 361 * 362 * LOCKS: Expects Line Writer Lock and Unit Resource Lock to be held 363 * across call. 364 */ 365 366 static int 367 erred_check_line(mr_unit_t *un, md_raidcs_t *cs, mr_column_t *column) 368 { 369 370 ASSERT(un != NULL); 371 ASSERT(cs->cs_flags & MD_RCS_LLOCKD); 372 373 if (column->un_devstate & RCS_OKAY) 374 return (RCL_OKAY); 375 376 if (column->un_devstate & RCS_ERRED) 377 return (RCL_ERRED); /* do not read from errored disk */ 378 379 /* 380 * for the last errored case their are two considerations. 381 * When the last errored column is the only errored column then 382 * do treat it like a maintenance column, not doing I/O from 383 * it. When it there are other failures then just attempt 384 * to use it. 385 */ 386 if (column->un_devstate & RCS_LAST_ERRED) 387 return (RCL_ERRED); 388 389 ASSERT(column->un_devstate & RCS_RESYNC); 390 391 /* 392 * When a resync from a hotspare is being done (copy resync) 393 * then always treat it as an OKAY column, since no regen 394 * is required. 395 */ 396 if (column->un_devflags & MD_RAID_COPY_RESYNC) { 397 return (RCL_OKAY); 398 } 399 400 mutex_enter(&un->un_mx); 401 if (cs->cs_line < un->un_resync_line_index) { 402 mutex_exit(&un->un_mx); 403 return (RCL_OKAY); 404 } 405 mutex_exit(&un->un_mx); 406 return (RCL_ERRED); 407 408 } 409 410 /* 411 * NAMES: raid_state_cnt 412 * 413 * DESCRIPTION: counts number of column in a specific state 414 * 415 * PARAMETERS: md_raid_t *un 416 * rcs_state state 417 */ 418 int 419 raid_state_cnt(mr_unit_t *un, rcs_state_t state) 420 { 421 int i, retval = 0; 422 423 for (i = 0; i < un->un_totalcolumncnt; i++) 424 if (un->un_column[i].un_devstate & state) 425 retval++; 426 return (retval); 427 } 428 429 /* 430 * NAMES: raid_io_overlaps 431 * 432 * DESCRIPTION: checkst for overlap of 2 child save structures 433 * 434 * PARAMETERS: md_raidcs_t cs1 435 * md_raidcs_t cs2 436 * 437 * RETURNS: 0 - no overlap 438 * 1 - overlap 439 */ 440 int 441 raid_io_overlaps(md_raidcs_t *cs1, md_raidcs_t *cs2) 442 { 443 if (cs1->cs_blkno > cs2->cs_lastblk) 444 return (0); 445 if (cs1->cs_lastblk < cs2->cs_blkno) 446 return (0); 447 return (1); 448 } 449 450 /* 451 * NAMES: raid_parent_constructor 452 * DESCRIPTION: parent structure constructor routine 453 * PARAMETERS: 454 */ 455 /*ARGSUSED1*/ 456 static int 457 raid_parent_constructor(void *p, void *d1, int d2) 458 { 459 mutex_init(&((md_raidps_t *)p)->ps_mx, 460 NULL, MUTEX_DEFAULT, NULL); 461 mutex_init(&((md_raidps_t *)p)->ps_mapin_mx, 462 NULL, MUTEX_DEFAULT, NULL); 463 return (0); 464 } 465 466 void 467 raid_parent_init(md_raidps_t *ps) 468 { 469 bzero(ps, offsetof(md_raidps_t, ps_mx)); 470 ((md_raidps_t *)ps)->ps_flags = MD_RPS_INUSE; 471 ((md_raidps_t *)ps)->ps_magic = RAID_PSMAGIC; 472 } 473 474 /*ARGSUSED1*/ 475 static void 476 raid_parent_destructor(void *p, void *d) 477 { 478 mutex_destroy(&((md_raidps_t *)p)->ps_mx); 479 mutex_destroy(&((md_raidps_t *)p)->ps_mapin_mx); 480 } 481 482 /* 483 * NAMES: raid_child_constructor 484 * DESCRIPTION: child structure constructor routine 485 * PARAMETERS: 486 */ 487 /*ARGSUSED1*/ 488 static int 489 raid_child_constructor(void *p, void *d1, int d2) 490 { 491 md_raidcs_t *cs = (md_raidcs_t *)p; 492 mutex_init(&cs->cs_mx, NULL, MUTEX_DEFAULT, NULL); 493 bioinit(&cs->cs_dbuf); 494 bioinit(&cs->cs_pbuf); 495 bioinit(&cs->cs_hbuf); 496 return (0); 497 } 498 499 void 500 raid_child_init(md_raidcs_t *cs) 501 { 502 bzero(cs, offsetof(md_raidcs_t, cs_mx)); 503 504 md_bioreset(&cs->cs_dbuf); 505 md_bioreset(&cs->cs_pbuf); 506 md_bioreset(&cs->cs_hbuf); 507 508 ((md_raidcs_t *)cs)->cs_dbuf.b_chain = 509 ((md_raidcs_t *)cs)->cs_pbuf.b_chain = 510 ((md_raidcs_t *)cs)->cs_hbuf.b_chain = 511 (struct buf *)(cs); 512 513 cs->cs_magic = RAID_CSMAGIC; 514 cs->cs_line = MD_DISKADDR_ERROR; 515 cs->cs_dpwslot = -1; 516 cs->cs_ppwslot = -1; 517 } 518 519 /*ARGSUSED1*/ 520 static void 521 raid_child_destructor(void *p, void *d) 522 { 523 biofini(&((md_raidcs_t *)p)->cs_dbuf); 524 biofini(&((md_raidcs_t *)p)->cs_hbuf); 525 biofini(&((md_raidcs_t *)p)->cs_pbuf); 526 mutex_destroy(&((md_raidcs_t *)p)->cs_mx); 527 } 528 529 /*ARGSUSED1*/ 530 static int 531 raid_cbuf_constructor(void *p, void *d1, int d2) 532 { 533 bioinit(&((md_raidcbuf_t *)p)->cbuf_bp); 534 return (0); 535 } 536 537 static void 538 raid_cbuf_init(md_raidcbuf_t *cb) 539 { 540 bzero(cb, offsetof(md_raidcbuf_t, cbuf_bp)); 541 md_bioreset(&cb->cbuf_bp); 542 cb->cbuf_magic = RAID_BUFMAGIC; 543 cb->cbuf_pwslot = -1; 544 cb->cbuf_flags = CBUF_WRITE; 545 } 546 547 /*ARGSUSED1*/ 548 static void 549 raid_cbuf_destructor(void *p, void *d) 550 { 551 biofini(&((md_raidcbuf_t *)p)->cbuf_bp); 552 } 553 554 /* 555 * NAMES: raid_run_queue 556 * DESCRIPTION: spawn a backend processing daemon for RAID metadevice. 557 * PARAMETERS: 558 */ 559 /*ARGSUSED*/ 560 static void 561 raid_run_queue(void *d) 562 { 563 if (!(md_status & MD_GBL_DAEMONS_LIVE)) 564 md_daemon(1, &md_done_daemon); 565 } 566 567 /* 568 * NAME: raid_build_pwslot 569 * DESCRIPTION: builds mr_pw_reserve for the column 570 * PARAMETERS: un is the pointer to the unit structure 571 * colindex is the column to create the structure for 572 */ 573 int 574 raid_build_pw_reservation(mr_unit_t *un, int colindex) 575 { 576 mr_pw_reserve_t *pw; 577 mr_scoreboard_t *sb; 578 int i; 579 580 pw = (mr_pw_reserve_t *) kmem_zalloc(sizeof (mr_pw_reserve_t) + 581 (sizeof (mr_scoreboard_t) * un->un_pwcnt), KM_SLEEP); 582 pw->pw_magic = RAID_PWMAGIC; 583 pw->pw_column = colindex; 584 pw->pw_free = un->un_pwcnt; 585 sb = &pw->pw_sb[0]; 586 for (i = 0; i < un->un_pwcnt; i++) { 587 sb[i].sb_column = colindex; 588 sb[i].sb_flags = SB_UNUSED; 589 sb[i].sb_start_blk = 0; 590 sb[i].sb_last_blk = 0; 591 sb[i].sb_cs = NULL; 592 } 593 un->un_column_ic[colindex].un_pw_reserve = pw; 594 return (0); 595 } 596 /* 597 * NAME: raid_free_pw_reservation 598 * DESCRIPTION: RAID metadevice pre-write slot structure destroy routine 599 * PARAMETERS: mr_unit_t *un - pointer to a unit structure 600 * int colindex - index of the column whose pre-write slot struct 601 * is to be destroyed. 602 */ 603 void 604 raid_free_pw_reservation(mr_unit_t *un, int colindex) 605 { 606 mr_pw_reserve_t *pw = un->un_column_ic[colindex].un_pw_reserve; 607 608 kmem_free(pw, sizeof (mr_pw_reserve_t) + 609 (sizeof (mr_scoreboard_t) * un->un_pwcnt)); 610 } 611 612 /* 613 * NAME: raid_cancel_pwslot 614 * DESCRIPTION: RAID metadevice write routine 615 * PARAMETERS: md_raidcs_t *cs - pointer to a child structure 616 */ 617 static void 618 raid_cancel_pwslot(md_raidcs_t *cs) 619 { 620 mr_unit_t *un = cs->cs_un; 621 mr_pw_reserve_t *pw; 622 mr_scoreboard_t *sb; 623 mr_column_ic_t *col; 624 md_raidcbuf_t *cbuf; 625 int broadcast = 0; 626 627 if (cs->cs_ps->ps_flags & MD_RPS_READ) 628 return; 629 if (cs->cs_dpwslot != -1) { 630 col = &un->un_column_ic[cs->cs_dcolumn]; 631 pw = col->un_pw_reserve; 632 sb = &pw->pw_sb[cs->cs_dpwslot]; 633 sb->sb_flags = SB_AVAIL; 634 if ((pw->pw_free++ == 0) || (un->un_rflags & MD_RFLAG_NEEDPW)) 635 broadcast++; 636 sb->sb_cs = NULL; 637 } 638 639 if (cs->cs_ppwslot != -1) { 640 col = &un->un_column_ic[cs->cs_pcolumn]; 641 pw = col->un_pw_reserve; 642 sb = &pw->pw_sb[cs->cs_ppwslot]; 643 sb->sb_flags = SB_AVAIL; 644 if ((pw->pw_free++ == 0) || (un->un_rflags & MD_RFLAG_NEEDPW)) 645 broadcast++; 646 sb->sb_cs = NULL; 647 } 648 649 for (cbuf = cs->cs_buflist; cbuf; cbuf = cbuf->cbuf_next) { 650 if (cbuf->cbuf_pwslot == -1) 651 continue; 652 col = &un->un_column_ic[cbuf->cbuf_column]; 653 pw = col->un_pw_reserve; 654 sb = &pw->pw_sb[cbuf->cbuf_pwslot]; 655 sb->sb_flags = SB_AVAIL; 656 if ((pw->pw_free++ == 0) || (un->un_rflags & MD_RFLAG_NEEDPW)) 657 broadcast++; 658 sb->sb_cs = NULL; 659 } 660 if (broadcast) { 661 cv_broadcast(&un->un_cv); 662 return; 663 } 664 mutex_enter(&un->un_mx); 665 if (un->un_rflags & MD_RFLAG_NEEDPW) 666 cv_broadcast(&un->un_cv); 667 mutex_exit(&un->un_mx); 668 } 669 670 static void 671 raid_free_pwinvalidate(md_raidcs_t *cs) 672 { 673 md_raidcbuf_t *cbuf; 674 md_raidcbuf_t *cbuf_to_free; 675 mr_unit_t *un = cs->cs_un; 676 mdi_unit_t *ui = MDI_UNIT(MD_SID(un)); 677 mr_pw_reserve_t *pw; 678 mr_scoreboard_t *sb; 679 int broadcast = 0; 680 681 cbuf = cs->cs_pw_inval_list; 682 ASSERT(cbuf); 683 mutex_enter(&un->un_linlck_mx); 684 while (cbuf) { 685 pw = un->un_column_ic[cbuf->cbuf_column].un_pw_reserve; 686 sb = &pw->pw_sb[0]; 687 ASSERT(sb[cbuf->cbuf_pwslot].sb_flags & SB_INVAL_PEND); 688 sb[cbuf->cbuf_pwslot].sb_flags = SB_UNUSED; 689 sb[cbuf->cbuf_pwslot].sb_cs = NULL; 690 if ((pw->pw_free++ == 0) || (un->un_rflags & MD_RFLAG_NEEDPW)) 691 broadcast++; 692 cbuf_to_free = cbuf; 693 cbuf = cbuf->cbuf_next; 694 kmem_free(cbuf_to_free->cbuf_buffer, dbtob(un->un_iosize)); 695 kmem_cache_free(raid_cbuf_cache, cbuf_to_free); 696 } 697 cs->cs_pw_inval_list = (md_raidcbuf_t *)NULL; 698 /* 699 * now that there is a free prewrite slot, check to see if there 700 * are any io operations waiting first wake up the raid_io_startup 701 * then signal the the processes waiting in raid_write. 702 */ 703 if (ui->ui_io_lock->io_list_front) 704 raid_io_startup(un); 705 mutex_exit(&un->un_linlck_mx); 706 if (broadcast) { 707 cv_broadcast(&un->un_cv); 708 return; 709 } 710 mutex_enter(&un->un_mx); 711 if (un->un_rflags & MD_RFLAG_NEEDPW) 712 cv_broadcast(&un->un_cv); 713 mutex_exit(&un->un_mx); 714 } 715 716 717 static int 718 raid_get_pwslot(md_raidcs_t *cs, int column) 719 { 720 mr_scoreboard_t *sb; 721 mr_pw_reserve_t *pw; 722 mr_unit_t *un = cs->cs_un; 723 diskaddr_t start_blk = cs->cs_blkno; 724 diskaddr_t last_blk = cs->cs_lastblk; 725 int i; 726 int pwcnt = un->un_pwcnt; 727 int avail = -1; 728 int use = -1; 729 int flags; 730 731 732 /* start with the data column */ 733 pw = cs->cs_un->un_column_ic[column].un_pw_reserve; 734 sb = &pw->pw_sb[0]; 735 ASSERT(pw->pw_free > 0); 736 for (i = 0; i < pwcnt; i++) { 737 flags = sb[i].sb_flags; 738 if (flags & SB_INVAL_PEND) 739 continue; 740 741 if ((avail == -1) && (flags & (SB_AVAIL | SB_UNUSED))) 742 avail = i; 743 744 if ((start_blk > sb[i].sb_last_blk) || 745 (last_blk < sb[i].sb_start_blk)) 746 continue; 747 748 /* OVERLAP */ 749 ASSERT(! (sb[i].sb_flags & SB_INUSE)); 750 751 /* 752 * raid_invalidate_pwslot attempts to zero out prewrite entry 753 * in parallel with other disk reads/writes related to current 754 * transaction. however cs_frags accounting for this case is 755 * broken because raid_write_io resets cs_frags i.e. ignoring 756 * that it could have been been set to > 0 value by 757 * raid_invalidate_pwslot. While this can be fixed an 758 * additional problem is that we don't seem to handle 759 * correctly the case of getting a disk error for prewrite 760 * entry invalidation. 761 * It does not look like we really need 762 * to invalidate prewrite slots because raid_replay sorts 763 * prewrite id's in ascending order and during recovery the 764 * latest prewrite entry for the same block will be replay 765 * last. That's why i ifdef'd out the call to 766 * raid_invalidate_pwslot. --aguzovsk@east 767 */ 768 769 if (use == -1) { 770 use = i; 771 } 772 } 773 774 ASSERT(avail != -1); 775 pw->pw_free--; 776 if (use == -1) 777 use = avail; 778 779 ASSERT(! (sb[use].sb_flags & SB_INUSE)); 780 sb[use].sb_flags = SB_INUSE; 781 sb[use].sb_cs = cs; 782 sb[use].sb_start_blk = start_blk; 783 sb[use].sb_last_blk = last_blk; 784 ASSERT((use >= 0) && (use < un->un_pwcnt)); 785 return (use); 786 } 787 788 static int 789 raid_check_pw(md_raidcs_t *cs) 790 { 791 792 mr_unit_t *un = cs->cs_un; 793 int i; 794 795 ASSERT(! (cs->cs_flags & MD_RCS_HAVE_PW_SLOTS)); 796 /* 797 * check to be sure there is a prewrite slot available 798 * if not just return. 799 */ 800 if (cs->cs_flags & MD_RCS_LINE) { 801 for (i = 0; i < un->un_totalcolumncnt; i++) 802 if (un->un_column_ic[i].un_pw_reserve->pw_free <= 0) 803 return (1); 804 return (0); 805 } 806 807 if (un->un_column_ic[cs->cs_dcolumn].un_pw_reserve->pw_free <= 0) 808 return (1); 809 if (un->un_column_ic[cs->cs_pcolumn].un_pw_reserve->pw_free <= 0) 810 return (1); 811 return (0); 812 } 813 static int 814 raid_alloc_pwslot(md_raidcs_t *cs) 815 { 816 mr_unit_t *un = cs->cs_un; 817 md_raidcbuf_t *cbuf; 818 819 ASSERT(! (cs->cs_flags & MD_RCS_HAVE_PW_SLOTS)); 820 if (raid_check_pw(cs)) 821 return (1); 822 823 mutex_enter(&un->un_mx); 824 un->un_pwid++; 825 cs->cs_pwid = un->un_pwid; 826 mutex_exit(&un->un_mx); 827 828 cs->cs_dpwslot = raid_get_pwslot(cs, cs->cs_dcolumn); 829 for (cbuf = cs->cs_buflist; cbuf; cbuf = cbuf->cbuf_next) { 830 cbuf->cbuf_pwslot = raid_get_pwslot(cs, cbuf->cbuf_column); 831 } 832 cs->cs_ppwslot = raid_get_pwslot(cs, cs->cs_pcolumn); 833 834 cs->cs_flags |= MD_RCS_HAVE_PW_SLOTS; 835 836 return (0); 837 } 838 839 /* 840 * NAMES: raid_build_incore 841 * DESCRIPTION: RAID metadevice incore structure building routine 842 * PARAMETERS: void *p - pointer to a unit structure 843 * int snarfing - a flag to indicate snarfing is required 844 */ 845 int 846 raid_build_incore(void *p, int snarfing) 847 { 848 mr_unit_t *un = (mr_unit_t *)p; 849 minor_t mnum = MD_SID(un); 850 mddb_recid_t hs_recid = 0; 851 int i; 852 int preserve_flags; 853 mr_column_t *column; 854 int iosize; 855 md_dev64_t hs, dev; 856 int resync_cnt = 0, error_cnt = 0; 857 858 hs = NODEV64; 859 dev = NODEV64; 860 861 /* clear out bogus pointer incase we return(1) prior to alloc */ 862 un->mr_ic = NULL; 863 864 if (MD_STATUS(un) & MD_UN_BEING_RESET) { 865 mddb_setrecprivate(un->c.un_record_id, MD_PRV_PENDCLEAN); 866 return (1); 867 } 868 869 if (MD_UNIT(mnum) != NULL) 870 return (0); 871 872 if (snarfing) 873 MD_STATUS(un) = 0; 874 875 un->mr_ic = (mr_unit_ic_t *)kmem_zalloc(sizeof (*un->mr_ic), 876 KM_SLEEP); 877 878 un->un_column_ic = (mr_column_ic_t *) 879 kmem_zalloc(sizeof (mr_column_ic_t) * 880 un->un_totalcolumncnt, KM_SLEEP); 881 882 for (i = 0; i < un->un_totalcolumncnt; i++) { 883 884 column = &un->un_column[i]; 885 preserve_flags = column->un_devflags & 886 (MD_RAID_COPY_RESYNC | MD_RAID_REGEN_RESYNC); 887 column->un_devflags &= 888 ~(MD_RAID_ALT_ISOPEN | MD_RAID_DEV_ISOPEN | 889 MD_RAID_WRITE_ALT); 890 if (raid_build_pw_reservation(un, i) != 0) { 891 /* could not build pwslot */ 892 return (1); 893 } 894 895 if (snarfing) { 896 set_t setno = MD_MIN2SET(mnum); 897 dev = md_getdevnum(setno, mddb_getsidenum(setno), 898 column->un_orig_key, MD_NOTRUST_DEVT); 899 /* 900 * Comment out instead of remove so we have history 901 * In the pre-SVM releases stored devt is used so 902 * as long as there is one snarf is always happy 903 * even the component is powered off. This is not 904 * the case in current SVM implementation. NODEV64 905 * can be returned and in this case since we resolve 906 * the devt at 'open' time (first use of metadevice) 907 * we will allow snarf continue. 908 * 909 * if (dev == NODEV64) 910 * return (1); 911 */ 912 913 /* 914 * Setup un_orig_dev from device id info if the device 915 * is valid (not NODEV64). 916 */ 917 if (dev != NODEV64) 918 column->un_orig_dev = dev; 919 920 if (column->un_devstate & RCS_RESYNC) 921 resync_cnt++; 922 if (column->un_devstate & (RCS_ERRED | RCS_LAST_ERRED)) 923 error_cnt++; 924 925 if (HOTSPARED(un, i)) { 926 (void) md_hot_spare_ifc(HS_MKDEV, 927 0, 0, 0, &column->un_hs_id, NULL, 928 &hs, NULL); 929 /* 930 * Same here 931 * 932 * if (hs == NODEV64) 933 * return (1); 934 */ 935 } 936 937 if (HOTSPARED(un, i)) { 938 if (column->un_devstate & 939 (RCS_OKAY | RCS_LAST_ERRED)) { 940 column->un_dev = hs; 941 column->un_pwstart = 942 column->un_hs_pwstart; 943 column->un_devstart = 944 column->un_hs_devstart; 945 preserve_flags &= 946 ~(MD_RAID_COPY_RESYNC | 947 MD_RAID_REGEN_RESYNC); 948 } else if (column->un_devstate & RCS_RESYNC) { 949 /* 950 * if previous system was 4.0 set 951 * the direction flags 952 */ 953 if ((preserve_flags & 954 (MD_RAID_COPY_RESYNC | 955 MD_RAID_REGEN_RESYNC)) == 0) { 956 if (column->un_alt_dev != 957 NODEV64) 958 preserve_flags |= 959 MD_RAID_COPY_RESYNC; 960 else 961 preserve_flags |= 962 /* CSTYLED */ 963 MD_RAID_REGEN_RESYNC; 964 } 965 } 966 } else { /* no hot spares */ 967 column->un_dev = dev; 968 column->un_pwstart = column->un_orig_pwstart; 969 column->un_devstart = column->un_orig_devstart; 970 if (column->un_devstate & RCS_RESYNC) { 971 preserve_flags |= MD_RAID_REGEN_RESYNC; 972 preserve_flags &= ~MD_RAID_COPY_RESYNC; 973 } 974 } 975 if (! (column->un_devstate & RCS_RESYNC)) { 976 preserve_flags &= 977 ~(MD_RAID_REGEN_RESYNC | 978 MD_RAID_COPY_RESYNC); 979 } 980 981 column->un_devflags = preserve_flags; 982 column->un_alt_dev = NODEV64; 983 column->un_alt_pwstart = 0; 984 column->un_alt_devstart = 0; 985 un->un_resync_line_index = 0; 986 un->un_resync_index = 0; 987 un->un_percent_done = 0; 988 } 989 } 990 991 if (resync_cnt && error_cnt) { 992 for (i = 0; i < un->un_totalcolumncnt; i++) { 993 column = &un->un_column[i]; 994 if (HOTSPARED(un, i) && 995 (column->un_devstate & RCS_RESYNC) && 996 (column->un_devflags & MD_RAID_COPY_RESYNC)) 997 /* hotspare has data */ 998 continue; 999 1000 if (HOTSPARED(un, i) && 1001 (column->un_devstate & RCS_RESYNC)) { 1002 /* hotspare does not have data */ 1003 raid_hs_release(HS_FREE, un, &hs_recid, i); 1004 column->un_dev = column->un_orig_dev; 1005 column->un_pwstart = column->un_orig_pwstart; 1006 column->un_devstart = column->un_orig_devstart; 1007 mddb_setrecprivate(hs_recid, MD_PRV_PENDCOM); 1008 } 1009 1010 if (column->un_devstate & RCS_ERRED) 1011 column->un_devstate = RCS_LAST_ERRED; 1012 1013 if (column->un_devstate & RCS_RESYNC) 1014 column->un_devstate = RCS_ERRED; 1015 } 1016 } 1017 mddb_setrecprivate(un->c.un_record_id, MD_PRV_PENDCOM); 1018 1019 un->un_pwid = 1; /* or some other possible value */ 1020 un->un_magic = RAID_UNMAGIC; 1021 iosize = un->un_iosize; 1022 un->un_pbuffer = kmem_alloc(dbtob(iosize), KM_SLEEP); 1023 un->un_dbuffer = kmem_alloc(dbtob(iosize), KM_SLEEP); 1024 mutex_init(&un->un_linlck_mx, NULL, MUTEX_DEFAULT, NULL); 1025 cv_init(&un->un_linlck_cv, NULL, CV_DEFAULT, NULL); 1026 un->un_linlck_chn = NULL; 1027 1028 /* place various information in the in-core data structures */ 1029 md_nblocks_set(mnum, un->c.un_total_blocks); 1030 MD_UNIT(mnum) = un; 1031 1032 return (0); 1033 } 1034 1035 /* 1036 * NAMES: reset_raid 1037 * DESCRIPTION: RAID metadevice reset routine 1038 * PARAMETERS: mr_unit_t *un - pointer to a unit structure 1039 * minor_t mnum - RAID metadevice minor number 1040 * int removing - a flag to imply removing device name from 1041 * MDDB database. 1042 */ 1043 void 1044 reset_raid(mr_unit_t *un, minor_t mnum, int removing) 1045 { 1046 int i, n = 0; 1047 sv_dev_t *sv; 1048 mr_column_t *column; 1049 int column_cnt = un->un_totalcolumncnt; 1050 mddb_recid_t *recids, vtoc_id; 1051 int hserr; 1052 1053 ASSERT((MDI_UNIT(mnum)->ui_io_lock->io_list_front == NULL) && 1054 (MDI_UNIT(mnum)->ui_io_lock->io_list_back == NULL)); 1055 1056 md_destroy_unit_incore(mnum, &raid_md_ops); 1057 1058 md_nblocks_set(mnum, -1ULL); 1059 MD_UNIT(mnum) = NULL; 1060 1061 if (un->un_pbuffer) { 1062 kmem_free(un->un_pbuffer, dbtob(un->un_iosize)); 1063 un->un_pbuffer = NULL; 1064 } 1065 if (un->un_dbuffer) { 1066 kmem_free(un->un_dbuffer, dbtob(un->un_iosize)); 1067 un->un_dbuffer = NULL; 1068 } 1069 1070 /* free all pre-write slots created during build incore */ 1071 for (i = 0; i < un->un_totalcolumncnt; i++) 1072 raid_free_pw_reservation(un, i); 1073 1074 kmem_free(un->un_column_ic, sizeof (mr_column_ic_t) * 1075 un->un_totalcolumncnt); 1076 1077 kmem_free(un->mr_ic, sizeof (*un->mr_ic)); 1078 1079 /* 1080 * Attempt release of its minor node 1081 */ 1082 md_remove_minor_node(mnum); 1083 1084 if (!removing) 1085 return; 1086 1087 sv = (sv_dev_t *)kmem_zalloc((column_cnt + 1) * sizeof (sv_dev_t), 1088 KM_SLEEP); 1089 1090 recids = (mddb_recid_t *) 1091 kmem_zalloc((column_cnt + 2) * sizeof (mddb_recid_t), KM_SLEEP); 1092 1093 for (i = 0; i < column_cnt; i++) { 1094 md_unit_t *comp_un; 1095 md_dev64_t comp_dev; 1096 1097 column = &un->un_column[i]; 1098 sv[i].setno = MD_MIN2SET(mnum); 1099 sv[i].key = column->un_orig_key; 1100 if (HOTSPARED(un, i)) { 1101 if (column->un_devstate & (RCS_ERRED | RCS_LAST_ERRED)) 1102 hserr = HS_BAD; 1103 else 1104 hserr = HS_FREE; 1105 raid_hs_release(hserr, un, &recids[n++], i); 1106 } 1107 /* 1108 * deparent any metadevices. 1109 * NOTE: currently soft partitions are the only metadevices 1110 * allowed in RAID metadevices. 1111 */ 1112 comp_dev = column->un_dev; 1113 if (md_getmajor(comp_dev) == md_major) { 1114 comp_un = MD_UNIT(md_getminor(comp_dev)); 1115 recids[n++] = MD_RECID(comp_un); 1116 md_reset_parent(comp_dev); 1117 } 1118 } 1119 /* decrement the reference count of the old hsp */ 1120 if (un->un_hsp_id != -1) 1121 (void) md_hot_spare_ifc(HSP_DECREF, un->un_hsp_id, 0, 0, 1122 &recids[n++], NULL, NULL, NULL); 1123 recids[n] = 0; 1124 MD_STATUS(un) |= MD_UN_BEING_RESET; 1125 vtoc_id = un->c.un_vtoc_id; 1126 1127 raid_commit(un, recids); 1128 1129 /* 1130 * Remove self from the namespace 1131 */ 1132 if (un->c.un_revision & MD_FN_META_DEV) { 1133 (void) md_rem_selfname(un->c.un_self_id); 1134 } 1135 1136 /* Remove the unit structure */ 1137 mddb_deleterec_wrapper(un->c.un_record_id); 1138 1139 /* Remove the vtoc, if present */ 1140 if (vtoc_id) 1141 mddb_deleterec_wrapper(vtoc_id); 1142 md_rem_names(sv, column_cnt); 1143 kmem_free(sv, (column_cnt + 1) * sizeof (sv_dev_t)); 1144 kmem_free(recids, (column_cnt + 2) * sizeof (mddb_recid_t)); 1145 1146 SE_NOTIFY(EC_SVM_CONFIG, ESC_SVM_DELETE, SVM_TAG_METADEVICE, 1147 MD_MIN2SET(mnum), mnum); 1148 } 1149 1150 /* 1151 * NAMES: raid_error_parent 1152 * DESCRIPTION: mark a parent structure in error 1153 * PARAMETERS: md_raidcs_t *cs - pointer to child structure 1154 * int error - error value to set 1155 * NOTE: (TBR) - this routine currently is not in use. 1156 */ 1157 static void 1158 raid_error_parent(md_raidps_t *ps, int error) 1159 { 1160 mutex_enter(&ps->ps_mx); 1161 ps->ps_flags |= MD_RPS_ERROR; 1162 ps->ps_error = error; 1163 mutex_exit(&ps->ps_mx); 1164 } 1165 1166 /* 1167 * The following defines tell raid_free_parent 1168 * RFP_RLS_LOCK release the unit reader lock when done. 1169 * RFP_DECR_PWFRAGS decrement ps_pwfrags 1170 * RFP_DECR_FRAGS decrement ps_frags 1171 * RFP_DECR_READFRAGS read keeps FRAGS and PWFRAGS in lockstep 1172 */ 1173 #define RFP_RLS_LOCK 0x00001 1174 #define RFP_DECR_PWFRAGS 0x00002 1175 #define RFP_DECR_FRAGS 0x00004 1176 #define RFP_DECR_READFRAGS (RFP_DECR_PWFRAGS | RFP_DECR_FRAGS) 1177 1178 /* 1179 * NAMES: raid_free_parent 1180 * DESCRIPTION: free a parent structure 1181 * PARAMETERS: md_raidcs_t *cs - pointer to child structure 1182 * int todo - indicates what needs to be done 1183 */ 1184 static void 1185 raid_free_parent(md_raidps_t *ps, int todo) 1186 { 1187 mdi_unit_t *ui = ps->ps_ui; 1188 1189 ASSERT(ps->ps_magic == RAID_PSMAGIC); 1190 ASSERT(ps->ps_flags & MD_RPS_INUSE); 1191 mutex_enter(&ps->ps_mx); 1192 if (todo & RFP_DECR_PWFRAGS) { 1193 ASSERT(ps->ps_pwfrags); 1194 ps->ps_pwfrags--; 1195 if (ps->ps_pwfrags == 0 && (! (ps->ps_flags & MD_RPS_IODONE))) { 1196 if (ps->ps_flags & MD_RPS_ERROR) { 1197 ps->ps_bp->b_flags |= B_ERROR; 1198 ps->ps_bp->b_error = ps->ps_error; 1199 } 1200 md_kstat_done(ui, ps->ps_bp, 0); 1201 biodone(ps->ps_bp); 1202 ps->ps_flags |= MD_RPS_IODONE; 1203 } 1204 } 1205 1206 if (todo & RFP_DECR_FRAGS) { 1207 ASSERT(ps->ps_frags); 1208 ps->ps_frags--; 1209 } 1210 1211 if (ps->ps_frags != 0) { 1212 mutex_exit(&ps->ps_mx); 1213 return; 1214 } 1215 1216 ASSERT((ps->ps_frags == 0) && (ps->ps_pwfrags == 0)); 1217 mutex_exit(&ps->ps_mx); 1218 1219 if (todo & RFP_RLS_LOCK) 1220 md_io_readerexit(ui); 1221 1222 if (panicstr) { 1223 ps->ps_flags |= MD_RPS_DONE; 1224 return; 1225 } 1226 1227 if (ps->ps_flags & MD_RPS_HSREQ) 1228 (void) raid_hotspares(); 1229 1230 ASSERT(todo & RFP_RLS_LOCK); 1231 ps->ps_flags &= ~MD_RPS_INUSE; 1232 1233 md_dec_iocount(MD_MIN2SET(ps->ps_un->c.un_self_id)); 1234 1235 kmem_cache_free(raid_parent_cache, ps); 1236 } 1237 1238 /* 1239 * NAMES: raid_free_child 1240 * DESCRIPTION: free a parent structure 1241 * PARAMETERS: md_raidcs_t *cs - pointer to child structure 1242 * int drop_locks - 0 for no locks held 1243 * NOTE: (TBR) - this routine currently is not in use. 1244 */ 1245 static void 1246 raid_free_child(md_raidcs_t *cs, int drop_locks) 1247 { 1248 mr_unit_t *un = cs->cs_un; 1249 md_raidcbuf_t *cbuf, *cbuf1; 1250 1251 if (cs->cs_pw_inval_list) 1252 raid_free_pwinvalidate(cs); 1253 1254 if (drop_locks) { 1255 ASSERT(cs->cs_flags & MD_RCS_LLOCKD && 1256 (cs->cs_flags & (MD_RCS_READER | MD_RCS_WRITER))); 1257 md_unit_readerexit(MDI_UNIT(MD_SID(un))); 1258 raid_line_exit(cs); 1259 } else { 1260 ASSERT(!(cs->cs_flags & MD_RCS_LLOCKD)); 1261 } 1262 1263 freebuffers(cs); 1264 cbuf = cs->cs_buflist; 1265 while (cbuf) { 1266 cbuf1 = cbuf->cbuf_next; 1267 kmem_cache_free(raid_cbuf_cache, cbuf); 1268 cbuf = cbuf1; 1269 } 1270 if (cs->cs_dbuf.b_flags & B_REMAPPED) 1271 bp_mapout(&cs->cs_dbuf); 1272 kmem_cache_free(raid_child_cache, cs); 1273 } 1274 1275 /* 1276 * NAME: raid_regen_parity 1277 * 1278 * DESCRIPTION: This routine is used to regenerate the parity blocks 1279 * for the entire raid device. It is called from 1280 * both the regen thread and the IO path. 1281 * 1282 * On error the entire device is marked as in error by 1283 * placing the erroring device in error and all other 1284 * devices in last_errored. 1285 * 1286 * PARAMETERS: md_raidcs_t *cs 1287 */ 1288 void 1289 raid_regen_parity(md_raidcs_t *cs) 1290 { 1291 mr_unit_t *un = cs->cs_un; 1292 mdi_unit_t *ui = MDI_UNIT(un->c.un_self_id); 1293 caddr_t buffer; 1294 caddr_t parity_buffer; 1295 buf_t *bp; 1296 uint_t *dbuf, *pbuf; 1297 uint_t colcnt = un->un_totalcolumncnt; 1298 int column; 1299 int parity_column = cs->cs_pcolumn; 1300 size_t bcount; 1301 int j; 1302 1303 /* 1304 * This routine uses the data and parity buffers allocated to a 1305 * write. In the case of a read the buffers are allocated and 1306 * freed at the end. 1307 */ 1308 1309 ASSERT(IO_READER_HELD(un)); 1310 ASSERT(cs->cs_flags & MD_RCS_LLOCKD); 1311 ASSERT(UNIT_READER_HELD(un)); 1312 1313 if (raid_state_cnt(un, RCS_OKAY) != colcnt) 1314 return; 1315 1316 if (cs->cs_flags & MD_RCS_READER) { 1317 getpbuffer(cs); 1318 getdbuffer(cs); 1319 } 1320 ASSERT(cs->cs_dbuffer && cs->cs_pbuffer); 1321 bcount = cs->cs_bcount; 1322 buffer = cs->cs_dbuffer; 1323 parity_buffer = cs->cs_pbuffer; 1324 bzero(parity_buffer, bcount); 1325 bp = &cs->cs_dbuf; 1326 for (column = 0; column < colcnt; column++) { 1327 if (column == parity_column) 1328 continue; 1329 reset_buf(bp, B_READ | B_BUSY, bcount); 1330 bp->b_un.b_addr = buffer; 1331 bp->b_edev = md_dev64_to_dev(un->un_column[column].un_dev); 1332 bp->b_lblkno = cs->cs_blkno + un->un_column[column].un_devstart; 1333 bp->b_bcount = bcount; 1334 bp->b_bufsize = bcount; 1335 (void) md_call_strategy(bp, MD_STR_NOTTOP, NULL); 1336 if (biowait(bp)) 1337 goto bail; 1338 pbuf = (uint_t *)(void *)parity_buffer; 1339 dbuf = (uint_t *)(void *)buffer; 1340 for (j = 0; j < (bcount / (sizeof (uint_t))); j++) { 1341 *pbuf = *pbuf ^ *dbuf; 1342 pbuf++; 1343 dbuf++; 1344 } 1345 } 1346 1347 reset_buf(bp, B_WRITE | B_BUSY, cs->cs_bcount); 1348 bp->b_un.b_addr = parity_buffer; 1349 bp->b_edev = md_dev64_to_dev(un->un_column[parity_column].un_dev); 1350 bp->b_lblkno = cs->cs_blkno + un->un_column[parity_column].un_devstart; 1351 bp->b_bcount = bcount; 1352 bp->b_bufsize = bcount; 1353 (void) md_call_strategy(bp, MD_STR_NOTTOP, NULL); 1354 if (biowait(bp)) 1355 goto bail; 1356 1357 if (cs->cs_flags & MD_RCS_READER) { 1358 freebuffers(cs); 1359 cs->cs_pbuffer = NULL; 1360 cs->cs_dbuffer = NULL; 1361 } 1362 bp->b_chain = (struct buf *)cs; 1363 return; 1364 bail: 1365 if (cs->cs_flags & MD_RCS_READER) { 1366 freebuffers(cs); 1367 cs->cs_pbuffer = NULL; 1368 cs->cs_dbuffer = NULL; 1369 } 1370 md_unit_readerexit(ui); 1371 un = md_unit_writerlock(ui); 1372 raid_set_state(un, column, RCS_ERRED, 0); 1373 for (column = 0; column < colcnt; column++) 1374 raid_set_state(un, column, RCS_ERRED, 0); 1375 raid_commit(un, NULL); 1376 md_unit_writerexit(ui); 1377 un = md_unit_readerlock(ui); 1378 bp->b_chain = (struct buf *)cs; 1379 } 1380 1381 /* 1382 * NAMES: raid_error_state 1383 * DESCRIPTION: check unit and column states' impact on I/O error 1384 * NOTE: the state now may not be the state when the 1385 * I/O completed due to race conditions. 1386 * PARAMETERS: mr_unit_t *un - pointer to raid unit structure 1387 * md_raidcs_t *cs - pointer to child structure 1388 * buf_t *bp - pointer to buffer structure 1389 */ 1390 static int 1391 raid_error_state(mr_unit_t *un, buf_t *bp) 1392 { 1393 int column; 1394 int i; 1395 1396 ASSERT(IO_READER_HELD(un)); 1397 ASSERT(UNIT_WRITER_HELD(un)); 1398 1399 column = -1; 1400 for (i = 0; i < un->un_totalcolumncnt; i++) { 1401 if (un->un_column[i].un_dev == md_expldev(bp->b_edev)) { 1402 column = i; 1403 break; 1404 } 1405 if (un->un_column[i].un_alt_dev == md_expldev(bp->b_edev)) { 1406 column = i; 1407 break; 1408 } 1409 } 1410 1411 /* in case a replace snuck in while waiting on unit writer lock */ 1412 1413 if (column == -1) { 1414 return (0); 1415 } 1416 1417 (void) raid_set_state(un, column, RCS_ERRED, 0); 1418 ASSERT(un->un_state & (RUS_ERRED | RUS_LAST_ERRED)); 1419 1420 raid_commit(un, NULL); 1421 if (un->un_state & RUS_ERRED) { 1422 SE_NOTIFY(EC_SVM_STATE, ESC_SVM_ERRED, SVM_TAG_METADEVICE, 1423 MD_UN2SET(un), MD_SID(un)); 1424 } else if (un->un_state & RUS_LAST_ERRED) { 1425 SE_NOTIFY(EC_SVM_STATE, ESC_SVM_LASTERRED, SVM_TAG_METADEVICE, 1426 MD_UN2SET(un), MD_SID(un)); 1427 } 1428 1429 return (EIO); 1430 } 1431 1432 /* 1433 * NAME: raid_mapin_buf 1434 * DESCRIPTION: wait for the input buffer header to be maped in 1435 * PARAMETERS: md_raidps_t *ps 1436 */ 1437 static void 1438 raid_mapin_buf(md_raidcs_t *cs) 1439 { 1440 md_raidps_t *ps = cs->cs_ps; 1441 1442 /* 1443 * check to see if the buffer is maped. If all is ok return the 1444 * offset of the data and return. Since it is expensive to grab 1445 * a mutex this is only done if the mapin is not complete. 1446 * Once the mutex is aquired it is possible that the mapin was 1447 * not done so recheck and if necessary do the mapin. 1448 */ 1449 if (ps->ps_mapin > 0) { 1450 cs->cs_addr = ps->ps_addr + cs->cs_offset; 1451 return; 1452 } 1453 mutex_enter(&ps->ps_mapin_mx); 1454 if (ps->ps_mapin > 0) { 1455 cs->cs_addr = ps->ps_addr + cs->cs_offset; 1456 mutex_exit(&ps->ps_mapin_mx); 1457 return; 1458 } 1459 bp_mapin(ps->ps_bp); 1460 /* 1461 * get the new b_addr out of the parent since bp_mapin just changed it 1462 */ 1463 ps->ps_addr = ps->ps_bp->b_un.b_addr; 1464 cs->cs_addr = ps->ps_addr + cs->cs_offset; 1465 ps->ps_mapin++; 1466 mutex_exit(&ps->ps_mapin_mx); 1467 } 1468 1469 /* 1470 * NAMES: raid_read_no_retry 1471 * DESCRIPTION: I/O retry routine for a RAID metadevice read 1472 * read failed attempting to regenerate the data, 1473 * no retry possible, error occured in raid_raidregenloop(). 1474 * PARAMETERS: mr_unit_t *un - pointer to raid unit structure 1475 * md_raidcs_t *cs - pointer to child structure 1476 */ 1477 /*ARGSUSED*/ 1478 static void 1479 raid_read_no_retry(mr_unit_t *un, md_raidcs_t *cs) 1480 { 1481 md_raidps_t *ps = cs->cs_ps; 1482 1483 raid_error_parent(ps, EIO); 1484 raid_free_child(cs, 1); 1485 1486 /* decrement readfrags */ 1487 raid_free_parent(ps, RFP_DECR_READFRAGS | RFP_RLS_LOCK); 1488 } 1489 1490 /* 1491 * NAMES: raid_read_retry 1492 * DESCRIPTION: I/O retry routine for a RAID metadevice read 1493 * PARAMETERS: md_raidcs_t *cs - pointer to child structure 1494 */ 1495 static void 1496 raid_read_retry(mr_unit_t *un, md_raidcs_t *cs) 1497 { 1498 /* re-initialize the buf_t structure for raid_read() */ 1499 cs->cs_dbuf.b_chain = (struct buf *)cs; 1500 cs->cs_dbuf.b_back = &cs->cs_dbuf; 1501 cs->cs_dbuf.b_forw = &cs->cs_dbuf; 1502 cs->cs_dbuf.b_flags = B_BUSY; /* initialize flags */ 1503 cs->cs_dbuf.b_error = 0; /* initialize error */ 1504 cs->cs_dbuf.b_offset = -1; 1505 /* Initialize semaphores */ 1506 sema_init(&cs->cs_dbuf.b_io, 0, NULL, 1507 SEMA_DEFAULT, NULL); 1508 sema_init(&cs->cs_dbuf.b_sem, 0, NULL, 1509 SEMA_DEFAULT, NULL); 1510 1511 cs->cs_pbuf.b_chain = (struct buf *)cs; 1512 cs->cs_pbuf.b_back = &cs->cs_pbuf; 1513 cs->cs_pbuf.b_forw = &cs->cs_pbuf; 1514 cs->cs_pbuf.b_flags = B_BUSY; /* initialize flags */ 1515 cs->cs_pbuf.b_error = 0; /* initialize error */ 1516 cs->cs_pbuf.b_offset = -1; 1517 sema_init(&cs->cs_pbuf.b_io, 0, NULL, 1518 SEMA_DEFAULT, NULL); 1519 sema_init(&cs->cs_pbuf.b_sem, 0, NULL, 1520 SEMA_DEFAULT, NULL); 1521 1522 cs->cs_flags &= ~MD_RCS_ERROR; /* reset child error flag */ 1523 cs->cs_flags |= MD_RCS_RECOVERY; /* set RECOVERY flag */ 1524 1525 /* 1526 * re-scheduling I/O with raid_read_io() is simpler. basically, 1527 * raid_read_io() is invoked again with same child structure. 1528 * (NOTE: we aren`t supposed to do any error recovery when an I/O 1529 * error occured in raid_raidregenloop(). 1530 */ 1531 raid_mapin_buf(cs); 1532 raid_read_io(un, cs); 1533 } 1534 1535 /* 1536 * NAMES: raid_rderr 1537 * DESCRIPTION: I/O error handling routine for a RAID metadevice read 1538 * PARAMETERS: md_raidcs_t *cs - pointer to child structure 1539 * LOCKS: must obtain unit writer lock while calling raid_error_state 1540 * since a unit or column state transition may take place. 1541 * must obtain unit reader lock to retry I/O. 1542 */ 1543 /*ARGSUSED*/ 1544 static void 1545 raid_rderr(md_raidcs_t *cs) 1546 { 1547 md_raidps_t *ps; 1548 mdi_unit_t *ui; 1549 mr_unit_t *un; 1550 int error = 0; 1551 1552 ps = cs->cs_ps; 1553 ui = ps->ps_ui; 1554 un = (mr_unit_t *)md_unit_writerlock(ui); 1555 ASSERT(un != 0); 1556 1557 if (cs->cs_dbuf.b_flags & B_ERROR) 1558 error = raid_error_state(un, &cs->cs_dbuf); 1559 if (cs->cs_pbuf.b_flags & B_ERROR) 1560 error |= raid_error_state(un, &cs->cs_pbuf); 1561 1562 md_unit_writerexit(ui); 1563 1564 ps->ps_flags |= MD_RPS_HSREQ; 1565 1566 un = (mr_unit_t *)md_unit_readerlock(ui); 1567 ASSERT(un != 0); 1568 /* now attempt the appropriate retry routine */ 1569 (*(cs->cs_retry_call))(un, cs); 1570 } 1571 1572 1573 /* 1574 * NAMES: raid_read_error 1575 * DESCRIPTION: I/O error handling routine for a RAID metadevice read 1576 * PARAMETERS: md_raidcs_t *cs - pointer to child structure 1577 */ 1578 /*ARGSUSED*/ 1579 static void 1580 raid_read_error(md_raidcs_t *cs) 1581 { 1582 md_raidps_t *ps; 1583 mdi_unit_t *ui; 1584 mr_unit_t *un; 1585 set_t setno; 1586 1587 ps = cs->cs_ps; 1588 ui = ps->ps_ui; 1589 un = cs->cs_un; 1590 1591 setno = MD_UN2SET(un); 1592 1593 if ((cs->cs_dbuf.b_flags & B_ERROR) && 1594 (COLUMN_STATE(un, cs->cs_dcolumn) != RCS_ERRED) && 1595 (COLUMN_STATE(un, cs->cs_dcolumn) != RCS_LAST_ERRED)) 1596 cmn_err(CE_WARN, "md %s: read error on %s", 1597 md_shortname(MD_SID(un)), 1598 md_devname(setno, md_expldev(cs->cs_dbuf.b_edev), NULL, 0)); 1599 1600 if ((cs->cs_pbuf.b_flags & B_ERROR) && 1601 (COLUMN_STATE(un, cs->cs_pcolumn) != RCS_ERRED) && 1602 (COLUMN_STATE(un, cs->cs_pcolumn) != RCS_LAST_ERRED)) 1603 cmn_err(CE_WARN, "md %s: read error on %s", 1604 md_shortname(MD_SID(un)), 1605 md_devname(setno, md_expldev(cs->cs_pbuf.b_edev), NULL, 0)); 1606 1607 md_unit_readerexit(ui); 1608 1609 ASSERT(cs->cs_frags == 0); 1610 1611 /* now schedule processing for possible state change */ 1612 daemon_request(&md_mstr_daemon, raid_rderr, 1613 (daemon_queue_t *)cs, REQ_OLD); 1614 1615 } 1616 1617 /* 1618 * NAMES: getdbuffer 1619 * DESCRIPTION: data buffer allocation for a child structure 1620 * PARAMETERS: md_raidcs_t *cs - pointer to child structure 1621 * 1622 * NOTE: always get dbuffer before pbuffer 1623 * and get both buffers before pwslot 1624 * otherwise a deadlock could be introduced. 1625 */ 1626 static void 1627 getdbuffer(md_raidcs_t *cs) 1628 { 1629 mr_unit_t *un; 1630 1631 cs->cs_dbuffer = kmem_alloc(cs->cs_bcount + DEV_BSIZE, KM_NOSLEEP); 1632 if (cs->cs_dbuffer != NULL) 1633 return; 1634 un = cs->cs_ps->ps_un; 1635 mutex_enter(&un->un_mx); 1636 while (un->un_dbuffer == NULL) { 1637 STAT_INC(data_buffer_waits); 1638 un->un_rflags |= MD_RFLAG_NEEDBUF; 1639 cv_wait(&un->un_cv, &un->un_mx); 1640 } 1641 cs->cs_dbuffer = un->un_dbuffer; 1642 cs->cs_flags |= MD_RCS_UNDBUF; 1643 un->un_dbuffer = NULL; 1644 mutex_exit(&un->un_mx); 1645 } 1646 1647 /* 1648 * NAMES: getpbuffer 1649 * DESCRIPTION: parity buffer allocation for a child structure 1650 * PARAMETERS: md_raidcs_t *cs - pointer to child structure 1651 * 1652 * NOTE: always get dbuffer before pbuffer 1653 * and get both buffers before pwslot 1654 * otherwise a deadlock could be introduced. 1655 */ 1656 static void 1657 getpbuffer(md_raidcs_t *cs) 1658 { 1659 mr_unit_t *un; 1660 1661 cs->cs_pbuffer = kmem_alloc(cs->cs_bcount + DEV_BSIZE, KM_NOSLEEP); 1662 if (cs->cs_pbuffer != NULL) 1663 return; 1664 un = cs->cs_ps->ps_un; 1665 mutex_enter(&un->un_mx); 1666 while (un->un_pbuffer == NULL) { 1667 STAT_INC(parity_buffer_waits); 1668 un->un_rflags |= MD_RFLAG_NEEDBUF; 1669 cv_wait(&un->un_cv, &un->un_mx); 1670 } 1671 cs->cs_pbuffer = un->un_pbuffer; 1672 cs->cs_flags |= MD_RCS_UNPBUF; 1673 un->un_pbuffer = NULL; 1674 mutex_exit(&un->un_mx); 1675 } 1676 static void 1677 getresources(md_raidcs_t *cs) 1678 { 1679 md_raidcbuf_t *cbuf; 1680 /* 1681 * NOTE: always get dbuffer before pbuffer 1682 * and get both buffers before pwslot 1683 * otherwise a deadlock could be introduced. 1684 */ 1685 getdbuffer(cs); 1686 getpbuffer(cs); 1687 for (cbuf = cs->cs_buflist; cbuf; cbuf = cbuf->cbuf_next) 1688 cbuf->cbuf_buffer = 1689 kmem_alloc(cs->cs_bcount + DEV_BSIZE, KM_SLEEP); 1690 } 1691 /* 1692 * NAMES: freebuffers 1693 * DESCRIPTION: child structure buffer freeing routine 1694 * PARAMETERS: md_raidcs_t *cs - pointer to child structure 1695 */ 1696 static void 1697 freebuffers(md_raidcs_t *cs) 1698 { 1699 mr_unit_t *un; 1700 md_raidcbuf_t *cbuf; 1701 1702 /* free buffers used for full line write */ 1703 for (cbuf = cs->cs_buflist; cbuf; cbuf = cbuf->cbuf_next) { 1704 if (cbuf->cbuf_buffer == NULL) 1705 continue; 1706 kmem_free(cbuf->cbuf_buffer, cbuf->cbuf_bcount + DEV_BSIZE); 1707 cbuf->cbuf_buffer = NULL; 1708 cbuf->cbuf_bcount = 0; 1709 } 1710 1711 if (cs->cs_flags & (MD_RCS_UNDBUF | MD_RCS_UNPBUF)) { 1712 un = cs->cs_un; 1713 mutex_enter(&un->un_mx); 1714 } 1715 if (cs->cs_dbuffer) { 1716 if (cs->cs_flags & MD_RCS_UNDBUF) 1717 un->un_dbuffer = cs->cs_dbuffer; 1718 else 1719 kmem_free(cs->cs_dbuffer, cs->cs_bcount + DEV_BSIZE); 1720 } 1721 if (cs->cs_pbuffer) { 1722 if (cs->cs_flags & MD_RCS_UNPBUF) 1723 un->un_pbuffer = cs->cs_pbuffer; 1724 else 1725 kmem_free(cs->cs_pbuffer, cs->cs_bcount + DEV_BSIZE); 1726 } 1727 if (cs->cs_flags & (MD_RCS_UNDBUF | MD_RCS_UNPBUF)) { 1728 un->un_rflags &= ~MD_RFLAG_NEEDBUF; 1729 cv_broadcast(&un->un_cv); 1730 mutex_exit(&un->un_mx); 1731 } 1732 } 1733 1734 /* 1735 * NAMES: raid_line_reader_lock, raid_line_writer_lock 1736 * DESCRIPTION: RAID metadevice line reader and writer lock routines 1737 * data column # and parity column #. 1738 * PARAMETERS: md_raidcs_t *cs - pointer to child structure 1739 */ 1740 1741 void 1742 raid_line_reader_lock(md_raidcs_t *cs, int resync_thread) 1743 { 1744 mr_unit_t *un; 1745 md_raidcs_t *cs1; 1746 1747 ASSERT(cs->cs_line != MD_DISKADDR_ERROR); 1748 un = cs->cs_un; 1749 cs->cs_flags |= MD_RCS_READER; 1750 STAT_CHECK(raid_line_lock_wait, MUTEX_HELD(&un->un_linlck_mx)); 1751 if (!panicstr) 1752 mutex_enter(&un->un_linlck_mx); 1753 cs1 = un->un_linlck_chn; 1754 while (cs1 != NULL) { 1755 for (cs1 = un->un_linlck_chn; cs1; cs1 = cs1->cs_linlck_next) 1756 if (raid_io_overlaps(cs, cs1) == 1) 1757 if (cs1->cs_flags & MD_RCS_WRITER) 1758 break; 1759 1760 if (cs1 != NULL) { 1761 if (panicstr) 1762 panic("md; raid line write lock held"); 1763 un->un_linlck_flg = 1; 1764 cv_wait(&un->un_linlck_cv, &un->un_linlck_mx); 1765 STAT_INC(raid_read_waits); 1766 } 1767 } 1768 STAT_MAX(raid_max_reader_locks, raid_reader_locks_active); 1769 STAT_INC(raid_reader_locks); 1770 cs1 = un->un_linlck_chn; 1771 if (cs1 != NULL) 1772 cs1->cs_linlck_prev = cs; 1773 cs->cs_linlck_next = cs1; 1774 cs->cs_linlck_prev = NULL; 1775 un->un_linlck_chn = cs; 1776 cs->cs_flags |= MD_RCS_LLOCKD; 1777 if (resync_thread) { 1778 diskaddr_t lastblk = cs->cs_blkno + cs->cs_blkcnt - 1; 1779 diskaddr_t line = (lastblk + 1) / un->un_segsize; 1780 ASSERT(raid_state_cnt(un, RCS_RESYNC)); 1781 mutex_enter(&un->un_mx); 1782 un->un_resync_line_index = line; 1783 mutex_exit(&un->un_mx); 1784 } 1785 if (!panicstr) 1786 mutex_exit(&un->un_linlck_mx); 1787 } 1788 1789 int 1790 raid_line_writer_lock(md_raidcs_t *cs, int lock) 1791 { 1792 mr_unit_t *un; 1793 md_raidcs_t *cs1; 1794 1795 ASSERT(cs->cs_line != MD_DISKADDR_ERROR); 1796 cs->cs_flags |= MD_RCS_WRITER; 1797 un = cs->cs_ps->ps_un; 1798 1799 STAT_CHECK(raid_line_lock_wait, MUTEX_HELD(&un->un_linlck_mx)); 1800 if (lock && !panicstr) 1801 mutex_enter(&un->un_linlck_mx); 1802 ASSERT(MUTEX_HELD(&un->un_linlck_mx)); 1803 1804 cs1 = un->un_linlck_chn; 1805 for (cs1 = un->un_linlck_chn; cs1; cs1 = cs1->cs_linlck_next) 1806 if (raid_io_overlaps(cs, cs1)) 1807 break; 1808 1809 if (cs1 != NULL) { 1810 if (panicstr) 1811 panic("md: line writer lock inaccessible"); 1812 goto no_lock_exit; 1813 } 1814 1815 if (raid_alloc_pwslot(cs)) { 1816 if (panicstr) 1817 panic("md: no prewrite slots"); 1818 STAT_INC(raid_prewrite_waits); 1819 goto no_lock_exit; 1820 } 1821 1822 cs1 = un->un_linlck_chn; 1823 if (cs1 != NULL) 1824 cs1->cs_linlck_prev = cs; 1825 cs->cs_linlck_next = cs1; 1826 cs->cs_linlck_prev = NULL; 1827 un->un_linlck_chn = cs; 1828 cs->cs_flags |= MD_RCS_LLOCKD; 1829 cs->cs_flags &= ~MD_RCS_WAITING; 1830 STAT_INC(raid_writer_locks); 1831 STAT_MAX(raid_max_write_locks, raid_write_locks_active); 1832 if (lock && !panicstr) 1833 mutex_exit(&un->un_linlck_mx); 1834 return (0); 1835 1836 no_lock_exit: 1837 /* if this is already queued then do not requeue it */ 1838 ASSERT(! (cs->cs_flags & MD_RCS_LLOCKD)); 1839 if (!lock || (cs->cs_flags & MD_RCS_WAITING)) 1840 return (1); 1841 cs->cs_flags |= MD_RCS_WAITING; 1842 cs->cs_un = un; 1843 raid_enqueue(cs); 1844 if (lock && !panicstr) 1845 mutex_exit(&un->un_linlck_mx); 1846 return (1); 1847 } 1848 1849 static void 1850 raid_startio(md_raidcs_t *cs) 1851 { 1852 mdi_unit_t *ui = cs->cs_ps->ps_ui; 1853 mr_unit_t *un = cs->cs_un; 1854 1855 un = md_unit_readerlock(ui); 1856 raid_write_io(un, cs); 1857 } 1858 1859 void 1860 raid_io_startup(mr_unit_t *un) 1861 { 1862 md_raidcs_t *waiting_list, *cs1; 1863 md_raidcs_t *previous = NULL, *next = NULL; 1864 mdi_unit_t *ui = MDI_UNIT(un->c.un_self_id); 1865 kmutex_t *io_list_mutex = &ui->ui_io_lock->io_list_mutex; 1866 1867 ASSERT(MUTEX_HELD(&un->un_linlck_mx)); 1868 mutex_enter(io_list_mutex); 1869 1870 /* 1871 * check to be sure there are no reader locks outstanding. If 1872 * there are not then pass on the writer lock. 1873 */ 1874 waiting_list = ui->ui_io_lock->io_list_front; 1875 while (waiting_list) { 1876 ASSERT(waiting_list->cs_flags & MD_RCS_WAITING); 1877 ASSERT(! (waiting_list->cs_flags & MD_RCS_LLOCKD)); 1878 for (cs1 = un->un_linlck_chn; cs1; cs1 = cs1->cs_linlck_next) 1879 if (raid_io_overlaps(waiting_list, cs1) == 1) 1880 break; 1881 /* 1882 * there was an IOs that overlaps this io so go onto 1883 * the next io in the waiting list 1884 */ 1885 if (cs1) { 1886 previous = waiting_list; 1887 waiting_list = waiting_list->cs_linlck_next; 1888 continue; 1889 } 1890 1891 /* 1892 * There are no IOs that overlap this, so remove it from 1893 * the waiting queue, and start it 1894 */ 1895 1896 if (raid_check_pw(waiting_list)) { 1897 ASSERT(waiting_list->cs_flags & MD_RCS_WAITING); 1898 previous = waiting_list; 1899 waiting_list = waiting_list->cs_linlck_next; 1900 continue; 1901 } 1902 ASSERT(waiting_list->cs_flags & MD_RCS_WAITING); 1903 1904 next = waiting_list->cs_linlck_next; 1905 if (previous) 1906 previous->cs_linlck_next = next; 1907 else 1908 ui->ui_io_lock->io_list_front = next; 1909 1910 if (ui->ui_io_lock->io_list_front == NULL) 1911 ui->ui_io_lock->io_list_back = NULL; 1912 1913 if (ui->ui_io_lock->io_list_back == waiting_list) 1914 ui->ui_io_lock->io_list_back = previous; 1915 1916 waiting_list->cs_linlck_next = NULL; 1917 waiting_list->cs_flags &= ~MD_RCS_WAITING; 1918 STAT_DEC(raid_write_queue_length); 1919 if (raid_line_writer_lock(waiting_list, 0)) 1920 panic("region locking corrupted"); 1921 1922 ASSERT(waiting_list->cs_flags & MD_RCS_LLOCKD); 1923 daemon_request(&md_mstr_daemon, raid_startio, 1924 (daemon_queue_t *)waiting_list, REQ_OLD); 1925 waiting_list = next; 1926 1927 } 1928 mutex_exit(io_list_mutex); 1929 } 1930 1931 void 1932 raid_line_exit(md_raidcs_t *cs) 1933 { 1934 mr_unit_t *un; 1935 1936 un = cs->cs_ps->ps_un; 1937 STAT_CHECK(raid_line_lock_wait, MUTEX_HELD(&un->un_linlck_mx)); 1938 mutex_enter(&un->un_linlck_mx); 1939 if (cs->cs_flags & MD_RCS_READER) 1940 STAT_DEC(raid_reader_locks_active); 1941 else 1942 STAT_DEC(raid_write_locks_active); 1943 1944 if (cs->cs_linlck_prev) 1945 cs->cs_linlck_prev->cs_linlck_next = cs->cs_linlck_next; 1946 else 1947 un->un_linlck_chn = cs->cs_linlck_next; 1948 if (cs->cs_linlck_next) 1949 cs->cs_linlck_next->cs_linlck_prev = cs->cs_linlck_prev; 1950 1951 cs->cs_flags &= ~MD_RCS_LLOCKD; 1952 1953 if (un->un_linlck_flg) 1954 cv_broadcast(&un->un_linlck_cv); 1955 1956 un->un_linlck_flg = 0; 1957 cs->cs_line = MD_DISKADDR_ERROR; 1958 1959 raid_cancel_pwslot(cs); 1960 /* 1961 * now that the lock is droped go ahead and see if there are any 1962 * other writes that can be started up 1963 */ 1964 raid_io_startup(un); 1965 1966 mutex_exit(&un->un_linlck_mx); 1967 } 1968 1969 /* 1970 * NAMES: raid_line, raid_pcolumn, raid_dcolumn 1971 * DESCRIPTION: RAID metadevice APIs for mapping segment # to line #, 1972 * data column # and parity column #. 1973 * PARAMETERS: int segment - segment number 1974 * mr_unit_t *un - pointer to an unit structure 1975 * RETURNS: raid_line returns line # 1976 * raid_dcolumn returns data column # 1977 * raid_pcolumn returns parity column # 1978 */ 1979 static diskaddr_t 1980 raid_line(diskaddr_t segment, mr_unit_t *un) 1981 { 1982 diskaddr_t adj_seg; 1983 diskaddr_t line; 1984 diskaddr_t max_orig_segment; 1985 1986 max_orig_segment = (un->un_origcolumncnt - 1) * un->un_segsincolumn; 1987 if (segment >= max_orig_segment) { 1988 adj_seg = segment - max_orig_segment; 1989 line = adj_seg % un->un_segsincolumn; 1990 } else { 1991 line = segment / (un->un_origcolumncnt - 1); 1992 } 1993 return (line); 1994 } 1995 1996 uint_t 1997 raid_dcolumn(diskaddr_t segment, mr_unit_t *un) 1998 { 1999 diskaddr_t adj_seg; 2000 diskaddr_t line; 2001 diskaddr_t max_orig_segment; 2002 uint_t column; 2003 2004 max_orig_segment = (un->un_origcolumncnt - 1) * un->un_segsincolumn; 2005 if (segment >= max_orig_segment) { 2006 adj_seg = segment - max_orig_segment; 2007 column = un->un_origcolumncnt + 2008 (uint_t)(adj_seg / un->un_segsincolumn); 2009 } else { 2010 line = segment / (un->un_origcolumncnt - 1); 2011 column = (uint_t)((segment % 2012 (un->un_origcolumncnt - 1) + line) % un->un_origcolumncnt); 2013 } 2014 return (column); 2015 } 2016 2017 uint_t 2018 raid_pcolumn(diskaddr_t segment, mr_unit_t *un) 2019 { 2020 diskaddr_t adj_seg; 2021 diskaddr_t line; 2022 diskaddr_t max_orig_segment; 2023 uint_t column; 2024 2025 max_orig_segment = (un->un_origcolumncnt - 1) * un->un_segsincolumn; 2026 if (segment >= max_orig_segment) { 2027 adj_seg = segment - max_orig_segment; 2028 line = adj_seg % un->un_segsincolumn; 2029 } else { 2030 line = segment / (un->un_origcolumncnt - 1); 2031 } 2032 column = (uint_t)((line + (un->un_origcolumncnt - 1)) % 2033 un->un_origcolumncnt); 2034 return (column); 2035 } 2036 2037 2038 /* 2039 * Is called in raid_iosetup to probe each column to insure 2040 * that all the columns are in 'okay' state and meet the 2041 * 'full line' requirement. If any column is in error, 2042 * we don't want to enable the 'full line' flag. Previously, 2043 * we would do so and disable it only when a error is 2044 * detected after the first 'full line' io which is too late 2045 * and leads to the potential data corruption. 2046 */ 2047 static int 2048 raid_check_cols(mr_unit_t *un) 2049 { 2050 buf_t bp; 2051 char *buf; 2052 mr_column_t *colptr; 2053 minor_t mnum = MD_SID(un); 2054 int i; 2055 int err = 0; 2056 2057 buf = kmem_zalloc((uint_t)DEV_BSIZE, KM_SLEEP); 2058 2059 for (i = 0; i < un->un_totalcolumncnt; i++) { 2060 md_dev64_t tmpdev; 2061 2062 colptr = &un->un_column[i]; 2063 2064 tmpdev = colptr->un_dev; 2065 /* 2066 * Open by device id 2067 * If this device is hotspared 2068 * use the hotspare key 2069 */ 2070 tmpdev = md_resolve_bydevid(mnum, tmpdev, HOTSPARED(un, i) ? 2071 colptr->un_hs_key : colptr->un_orig_key); 2072 2073 if (tmpdev == NODEV64) { 2074 err = 1; 2075 break; 2076 } 2077 2078 colptr->un_dev = tmpdev; 2079 2080 bzero((caddr_t)&bp, sizeof (buf_t)); 2081 bp.b_back = &bp; 2082 bp.b_forw = &bp; 2083 bp.b_flags = (B_READ | B_BUSY); 2084 sema_init(&bp.b_io, 0, NULL, 2085 SEMA_DEFAULT, NULL); 2086 sema_init(&bp.b_sem, 0, NULL, 2087 SEMA_DEFAULT, NULL); 2088 bp.b_edev = md_dev64_to_dev(colptr->un_dev); 2089 bp.b_lblkno = colptr->un_pwstart; 2090 bp.b_bcount = DEV_BSIZE; 2091 bp.b_bufsize = DEV_BSIZE; 2092 bp.b_un.b_addr = (caddr_t)buf; 2093 (void) md_call_strategy(&bp, 0, NULL); 2094 if (biowait(&bp)) { 2095 err = 1; 2096 break; 2097 } 2098 } 2099 2100 kmem_free(buf, DEV_BSIZE); 2101 return (err); 2102 } 2103 2104 /* 2105 * NAME: raid_iosetup 2106 * DESCRIPTION: RAID metadevice specific I/O set up routine which does 2107 * all the necessary calculations to determine the location 2108 * of the segement for the I/O. 2109 * PARAMETERS: mr_unit_t *un - unit number of RAID metadevice 2110 * diskaddr_t blkno - block number of the I/O attempt 2111 * size_t blkcnt - block count for this I/O 2112 * md_raidcs_t *cs - child structure for each segmented I/O 2113 * 2114 * NOTE: The following is an example of a raid disk layer out: 2115 * 2116 * Total Column = 5 2117 * Original Column = 4 2118 * Segment Per Column = 10 2119 * 2120 * Col#0 Col#1 Col#2 Col#3 Col#4 Col#5 Col#6 2121 * ------------------------------------------------------------- 2122 * line#0 Seg#0 Seg#1 Seg#2 Parity Seg#30 Seg#40 2123 * line#1 Parity Seg#3 Seg#4 Seg#5 Seg#31 2124 * line#2 Seg#8 Parity Seg#6 Seg#7 Seg#32 2125 * line#3 Seg#10 Seg#11 Parity Seg#9 Seg#33 2126 * line#4 Seg#12 Seg#13 Seg#14 Parity Seg#34 2127 * line#5 Parity Seg#15 Seg#16 Seg#17 Seg#35 2128 * line#6 Seg#20 Parity Seg#18 Seg#19 Seg#36 2129 * line#7 Seg#22 Seg#23 Parity Seg#21 Seg#37 2130 * line#8 Seg#24 Seg#25 Seg#26 Parity Seg#38 2131 * line#9 Parity Seg#27 Seg#28 Seg#29 Seg#39 2132 */ 2133 static size_t 2134 raid_iosetup( 2135 mr_unit_t *un, 2136 diskaddr_t blkno, 2137 size_t blkcnt, 2138 md_raidcs_t *cs 2139 ) 2140 { 2141 diskaddr_t segment; 2142 diskaddr_t segstart; 2143 diskaddr_t segoff; 2144 size_t leftover; 2145 diskaddr_t line; 2146 uint_t iosize; 2147 uint_t colcnt; 2148 2149 /* caculate the segment# and offset for the block */ 2150 segment = blkno / un->un_segsize; 2151 segstart = segment * un->un_segsize; 2152 segoff = blkno - segstart; 2153 iosize = un->un_iosize - 1; 2154 colcnt = un->un_totalcolumncnt - 1; 2155 line = raid_line(segment, un); 2156 cs->cs_dcolumn = raid_dcolumn(segment, un); 2157 cs->cs_pcolumn = raid_pcolumn(segment, un); 2158 cs->cs_dflags = un->un_column[cs->cs_dcolumn].un_devflags; 2159 cs->cs_pflags = un->un_column[cs->cs_pcolumn].un_devflags; 2160 cs->cs_line = line; 2161 2162 if ((cs->cs_ps->ps_flags & MD_RPS_WRITE) && 2163 (UNIT_STATE(un) & RCS_OKAY) && 2164 (segoff == 0) && 2165 (un->un_totalcolumncnt == un->un_origcolumncnt) && 2166 (un->un_segsize < un->un_iosize) && 2167 (un->un_iosize <= un->un_maxio) && 2168 (blkno == line * un->un_segsize * colcnt) && 2169 (blkcnt >= ((un->un_totalcolumncnt -1) * un->un_segsize)) && 2170 (raid_state_cnt(un, RCS_OKAY) == un->un_origcolumncnt) && 2171 (raid_check_cols(un) == 0)) { 2172 2173 md_raidcbuf_t **cbufp; 2174 md_raidcbuf_t *cbuf; 2175 int i, j; 2176 2177 STAT_INC(raid_full_line_writes); 2178 leftover = blkcnt - (un->un_segsize * colcnt); 2179 ASSERT(blkcnt >= (un->un_segsize * colcnt)); 2180 cs->cs_blkno = line * un->un_segsize; 2181 cs->cs_blkcnt = un->un_segsize; 2182 cs->cs_lastblk = cs->cs_blkno + cs->cs_blkcnt - 1; 2183 cs->cs_bcount = dbtob(cs->cs_blkcnt); 2184 cs->cs_flags |= MD_RCS_LINE; 2185 2186 cbufp = &cs->cs_buflist; 2187 for (i = 0; i < un->un_totalcolumncnt; i++) { 2188 j = cs->cs_dcolumn + i; 2189 j = j % un->un_totalcolumncnt; 2190 2191 if ((j == cs->cs_dcolumn) || (j == cs->cs_pcolumn)) 2192 continue; 2193 cbuf = kmem_cache_alloc(raid_cbuf_cache, 2194 MD_ALLOCFLAGS); 2195 raid_cbuf_init(cbuf); 2196 cbuf->cbuf_un = cs->cs_un; 2197 cbuf->cbuf_ps = cs->cs_ps; 2198 cbuf->cbuf_column = j; 2199 cbuf->cbuf_bcount = dbtob(un->un_segsize); 2200 *cbufp = cbuf; 2201 cbufp = &cbuf->cbuf_next; 2202 } 2203 return (leftover); 2204 } 2205 2206 leftover = blkcnt - (un->un_segsize - segoff); 2207 if (blkcnt > (un->un_segsize - segoff)) 2208 blkcnt -= leftover; 2209 else 2210 leftover = 0; 2211 2212 if (blkcnt > (size_t)iosize) { 2213 leftover += (blkcnt - iosize); 2214 blkcnt = iosize; 2215 } 2216 2217 /* calculate the line# and column# for the segment */ 2218 cs->cs_flags &= ~MD_RCS_LINE; 2219 cs->cs_blkno = line * un->un_segsize + segoff; 2220 cs->cs_blkcnt = (uint_t)blkcnt; 2221 cs->cs_lastblk = cs->cs_blkno + cs->cs_blkcnt - 1; 2222 cs->cs_bcount = dbtob((uint_t)blkcnt); 2223 return (leftover); 2224 } 2225 2226 /* 2227 * NAME: raid_done 2228 * DESCRIPTION: RAID metadevice I/O done interrupt routine 2229 * PARAMETERS: struct buf *bp - pointer to a buffer structure 2230 */ 2231 static void 2232 raid_done(struct buf *bp) 2233 { 2234 md_raidcs_t *cs; 2235 int flags, frags; 2236 2237 sema_v(&bp->b_io); 2238 cs = (md_raidcs_t *)bp->b_chain; 2239 2240 ASSERT(cs != NULL); 2241 2242 mutex_enter(&cs->cs_mx); 2243 if (bp->b_flags & B_ERROR) { 2244 cs->cs_flags |= MD_RCS_ERROR; 2245 cs->cs_flags &= ~(MD_RCS_ISCALL); 2246 } 2247 2248 flags = cs->cs_flags; 2249 frags = --cs->cs_frags; 2250 mutex_exit(&cs->cs_mx); 2251 if (frags != 0) { 2252 return; 2253 } 2254 2255 if (flags & MD_RCS_ERROR) { 2256 if (cs->cs_error_call) { 2257 daemon_request(&md_done_daemon, cs->cs_error_call, 2258 (daemon_queue_t *)cs, REQ_OLD); 2259 } 2260 return; 2261 } 2262 2263 if (flags & MD_RCS_ISCALL) { 2264 cs->cs_flags &= ~(MD_RCS_ISCALL); 2265 (*(cs->cs_call))(cs); 2266 return; 2267 } 2268 daemon_request(&md_done_daemon, cs->cs_call, 2269 (daemon_queue_t *)cs, REQ_OLD); 2270 } 2271 /* 2272 * the flag RIO_EXTRA is used when dealing with a column in the process 2273 * of being resynced. During the resync, writes may have to take place 2274 * on both the original component and a hotspare component. 2275 */ 2276 #define RIO_DATA 0x00100 /* use data buffer & data column */ 2277 #define RIO_PARITY 0x00200 /* use parity buffer & parity column */ 2278 #define RIO_WRITE 0x00400 /* issue a write */ 2279 #define RIO_READ 0x00800 /* issue a read */ 2280 #define RIO_PWIO 0x01000 /* do the I/O to the prewrite entry */ 2281 #define RIO_ALT 0x02000 /* do write to alternate device */ 2282 #define RIO_EXTRA 0x04000 /* use extra buffer */ 2283 2284 #define RIO_COLMASK 0x000ff 2285 2286 #define RIO_PREWRITE RIO_WRITE | RIO_PWIO 2287 2288 /* 2289 * NAME: raidio 2290 * DESCRIPTION: RAID metadevice write routine 2291 * PARAMETERS: md_raidcs_t *cs - pointer to a child structure 2292 */ 2293 static void 2294 raidio(md_raidcs_t *cs, int flags) 2295 { 2296 buf_t *bp; 2297 int column; 2298 int flag; 2299 void *private; 2300 mr_unit_t *un; 2301 int iosize; 2302 diskaddr_t pwstart; 2303 diskaddr_t devstart; 2304 md_dev64_t dev; 2305 2306 un = cs->cs_un; 2307 2308 ASSERT(IO_READER_HELD(un)); 2309 ASSERT(UNIT_READER_HELD(un)); 2310 2311 if (flags & RIO_DATA) { 2312 if (flags & RIO_EXTRA) 2313 bp = &cs->cs_hbuf; 2314 else 2315 bp = &cs->cs_dbuf; 2316 bp->b_un.b_addr = cs->cs_dbuffer; 2317 column = cs->cs_dcolumn; 2318 } else { 2319 if (flags & RIO_EXTRA) 2320 bp = &cs->cs_hbuf; 2321 else 2322 bp = &cs->cs_pbuf; 2323 bp->b_un.b_addr = cs->cs_pbuffer; 2324 column = cs->cs_pcolumn; 2325 } 2326 if (flags & RIO_COLMASK) 2327 column = (flags & RIO_COLMASK) - 1; 2328 2329 bp->b_bcount = cs->cs_bcount; 2330 bp->b_bufsize = cs->cs_bcount; 2331 iosize = un->un_iosize; 2332 2333 /* check if the hotspared device will be used */ 2334 if (flags & RIO_ALT && (flags & RIO_WRITE)) { 2335 pwstart = un->un_column[column].un_alt_pwstart; 2336 devstart = un->un_column[column].un_alt_devstart; 2337 dev = un->un_column[column].un_alt_dev; 2338 } else { 2339 pwstart = un->un_column[column].un_pwstart; 2340 devstart = un->un_column[column].un_devstart; 2341 dev = un->un_column[column].un_dev; 2342 } 2343 2344 /* if not writing to log skip log header */ 2345 if ((flags & RIO_PWIO) == 0) { 2346 bp->b_lblkno = devstart + cs->cs_blkno; 2347 bp->b_un.b_addr += DEV_BSIZE; 2348 } else { 2349 bp->b_bcount += DEV_BSIZE; 2350 bp->b_bufsize = bp->b_bcount; 2351 if (flags & RIO_DATA) { 2352 bp->b_lblkno = cs->cs_dpwslot * iosize + pwstart; 2353 } else { /* not DATA -> PARITY */ 2354 bp->b_lblkno = cs->cs_ppwslot * iosize + pwstart; 2355 } 2356 } 2357 2358 bp->b_flags &= ~(B_READ | B_WRITE | B_ERROR | nv_available); 2359 bp->b_flags |= B_BUSY; 2360 if (flags & RIO_READ) { 2361 bp->b_flags |= B_READ; 2362 } else { 2363 bp->b_flags |= B_WRITE; 2364 if ((nv_available && nv_parity && (flags & RIO_PARITY)) || 2365 (nv_available && nv_prewrite && (flags & RIO_PWIO))) 2366 bp->b_flags |= nv_available; 2367 } 2368 bp->b_iodone = (int (*)())raid_done; 2369 bp->b_edev = md_dev64_to_dev(dev); 2370 2371 ASSERT((bp->b_edev != 0) && (bp->b_edev != NODEV)); 2372 2373 private = cs->cs_strategy_private; 2374 flag = cs->cs_strategy_flag; 2375 2376 md_call_strategy(bp, flag, private); 2377 } 2378 2379 /* 2380 * NAME: genstandardparity 2381 * DESCRIPTION: This routine 2382 * PARAMETERS: md_raidcs_t *cs - pointer to a child structure 2383 */ 2384 static void 2385 genstandardparity(md_raidcs_t *cs) 2386 { 2387 uint_t *dbuf, *pbuf; 2388 size_t wordcnt; 2389 uint_t dsum = 0; 2390 uint_t psum = 0; 2391 2392 ASSERT((cs->cs_bcount & 0x3) == 0); 2393 2394 wordcnt = cs->cs_bcount / sizeof (uint_t); 2395 2396 dbuf = (uint_t *)(void *)(cs->cs_dbuffer + DEV_BSIZE); 2397 pbuf = (uint_t *)(void *)(cs->cs_pbuffer + DEV_BSIZE); 2398 2399 /* Word aligned */ 2400 if (((uintptr_t)cs->cs_addr & 0x3) == 0) { 2401 uint_t *uwbuf = (uint_t *)(void *)(cs->cs_addr); 2402 uint_t uval; 2403 2404 while (wordcnt--) { 2405 uval = *uwbuf++; 2406 psum ^= (*pbuf = ((*pbuf ^ *dbuf) ^ uval)); 2407 ++pbuf; 2408 *dbuf = uval; 2409 dsum ^= uval; 2410 ++dbuf; 2411 } 2412 } else { 2413 uchar_t *ubbuf = (uchar_t *)(cs->cs_addr); 2414 union { 2415 uint_t wb; 2416 uchar_t bb[4]; 2417 } cb; 2418 2419 while (wordcnt--) { 2420 cb.bb[0] = *ubbuf++; 2421 cb.bb[1] = *ubbuf++; 2422 cb.bb[2] = *ubbuf++; 2423 cb.bb[3] = *ubbuf++; 2424 psum ^= (*pbuf = ((*pbuf ^ *dbuf) ^ cb.wb)); 2425 ++pbuf; 2426 *dbuf = cb.wb; 2427 dsum ^= cb.wb; 2428 ++dbuf; 2429 } 2430 } 2431 2432 RAID_FILLIN_RPW(cs->cs_dbuffer, cs->cs_un, dsum, cs->cs_pcolumn, 2433 cs->cs_blkno, cs->cs_blkcnt, cs->cs_pwid, 2434 2, cs->cs_dcolumn, RAID_PWMAGIC); 2435 2436 RAID_FILLIN_RPW(cs->cs_pbuffer, cs->cs_un, psum, cs->cs_dcolumn, 2437 cs->cs_blkno, cs->cs_blkcnt, cs->cs_pwid, 2438 2, cs->cs_pcolumn, RAID_PWMAGIC); 2439 } 2440 2441 static void 2442 genlineparity(md_raidcs_t *cs) 2443 { 2444 2445 mr_unit_t *un = cs->cs_un; 2446 md_raidcbuf_t *cbuf; 2447 uint_t *pbuf, *dbuf; 2448 uint_t *uwbuf; 2449 uchar_t *ubbuf; 2450 size_t wordcnt; 2451 uint_t psum = 0, dsum = 0; 2452 size_t count = un->un_segsize * DEV_BSIZE; 2453 uint_t col; 2454 buf_t *bp; 2455 2456 ASSERT((cs->cs_bcount & 0x3) == 0); 2457 2458 pbuf = (uint_t *)(void *)(cs->cs_pbuffer + DEV_BSIZE); 2459 dbuf = (uint_t *)(void *)(cs->cs_dbuffer + DEV_BSIZE); 2460 uwbuf = (uint_t *)(void *)(cs->cs_addr); 2461 ubbuf = (uchar_t *)(void *)(cs->cs_addr); 2462 2463 wordcnt = count / sizeof (uint_t); 2464 2465 /* Word aligned */ 2466 if (((uintptr_t)cs->cs_addr & 0x3) == 0) { 2467 uint_t uval; 2468 2469 while (wordcnt--) { 2470 uval = *uwbuf++; 2471 *dbuf = uval; 2472 *pbuf = uval; 2473 dsum ^= uval; 2474 ++pbuf; 2475 ++dbuf; 2476 } 2477 } else { 2478 union { 2479 uint_t wb; 2480 uchar_t bb[4]; 2481 } cb; 2482 2483 while (wordcnt--) { 2484 cb.bb[0] = *ubbuf++; 2485 cb.bb[1] = *ubbuf++; 2486 cb.bb[2] = *ubbuf++; 2487 cb.bb[3] = *ubbuf++; 2488 *dbuf = cb.wb; 2489 *pbuf = cb.wb; 2490 dsum ^= cb.wb; 2491 ++pbuf; 2492 ++dbuf; 2493 } 2494 } 2495 2496 RAID_FILLIN_RPW(cs->cs_dbuffer, un, dsum, cs->cs_pcolumn, 2497 cs->cs_blkno, cs->cs_blkcnt, cs->cs_pwid, 2498 un->un_totalcolumncnt, cs->cs_dcolumn, RAID_PWMAGIC); 2499 2500 raidio(cs, RIO_PREWRITE | RIO_DATA); 2501 2502 for (cbuf = cs->cs_buflist; cbuf; cbuf = cbuf->cbuf_next) { 2503 2504 dsum = 0; 2505 pbuf = (uint_t *)(void *)(cs->cs_pbuffer + DEV_BSIZE); 2506 dbuf = (uint_t *)(void *)(cbuf->cbuf_buffer + DEV_BSIZE); 2507 2508 wordcnt = count / sizeof (uint_t); 2509 2510 col = cbuf->cbuf_column; 2511 2512 /* Word aligned */ 2513 if (((uintptr_t)cs->cs_addr & 0x3) == 0) { 2514 uint_t uval; 2515 2516 /* 2517 * Only calculate psum when working on the last 2518 * data buffer. 2519 */ 2520 if (cbuf->cbuf_next == NULL) { 2521 psum = 0; 2522 while (wordcnt--) { 2523 uval = *uwbuf++; 2524 *dbuf = uval; 2525 psum ^= (*pbuf ^= uval); 2526 dsum ^= uval; 2527 ++dbuf; 2528 ++pbuf; 2529 } 2530 } else { 2531 while (wordcnt--) { 2532 uval = *uwbuf++; 2533 *dbuf = uval; 2534 *pbuf ^= uval; 2535 dsum ^= uval; 2536 ++dbuf; 2537 ++pbuf; 2538 } 2539 } 2540 } else { 2541 union { 2542 uint_t wb; 2543 uchar_t bb[4]; 2544 } cb; 2545 2546 /* 2547 * Only calculate psum when working on the last 2548 * data buffer. 2549 */ 2550 if (cbuf->cbuf_next == NULL) { 2551 psum = 0; 2552 while (wordcnt--) { 2553 cb.bb[0] = *ubbuf++; 2554 cb.bb[1] = *ubbuf++; 2555 cb.bb[2] = *ubbuf++; 2556 cb.bb[3] = *ubbuf++; 2557 *dbuf = cb.wb; 2558 psum ^= (*pbuf ^= cb.wb); 2559 dsum ^= cb.wb; 2560 ++dbuf; 2561 ++pbuf; 2562 } 2563 } else { 2564 while (wordcnt--) { 2565 cb.bb[0] = *ubbuf++; 2566 cb.bb[1] = *ubbuf++; 2567 cb.bb[2] = *ubbuf++; 2568 cb.bb[3] = *ubbuf++; 2569 *dbuf = cb.wb; 2570 *pbuf ^= cb.wb; 2571 dsum ^= cb.wb; 2572 ++dbuf; 2573 ++pbuf; 2574 } 2575 } 2576 } 2577 RAID_FILLIN_RPW(cbuf->cbuf_buffer, un, dsum, cs->cs_pcolumn, 2578 cs->cs_blkno, cs->cs_blkcnt, cs->cs_pwid, 2579 un->un_totalcolumncnt, col, RAID_PWMAGIC); 2580 2581 /* 2582 * fill in buffer for write to prewrite area 2583 */ 2584 bp = &cbuf->cbuf_bp; 2585 bp->b_un.b_addr = cbuf->cbuf_buffer; 2586 bp->b_bcount = cbuf->cbuf_bcount + DEV_BSIZE; 2587 bp->b_bufsize = bp->b_bcount; 2588 bp->b_lblkno = (cbuf->cbuf_pwslot * un->un_iosize) + 2589 un->un_column[col].un_pwstart; 2590 bp->b_flags = B_WRITE | B_BUSY; 2591 if (nv_available && nv_prewrite) 2592 bp->b_flags |= nv_available; 2593 bp->b_iodone = (int (*)())raid_done; 2594 bp->b_edev = md_dev64_to_dev(un->un_column[col].un_dev); 2595 bp->b_chain = (struct buf *)cs; 2596 md_call_strategy(bp, 2597 cs->cs_strategy_flag, cs->cs_strategy_private); 2598 } 2599 2600 RAID_FILLIN_RPW(cs->cs_pbuffer, un, psum, cs->cs_dcolumn, 2601 cs->cs_blkno, cs->cs_blkcnt, cs->cs_pwid, 2602 un->un_totalcolumncnt, cs->cs_pcolumn, RAID_PWMAGIC); 2603 2604 raidio(cs, RIO_PREWRITE | RIO_PARITY); 2605 } 2606 2607 /* 2608 * NAME: raid_readregenloop 2609 * DESCRIPTION: RAID metadevice write routine 2610 * PARAMETERS: md_raidcs_t *cs - pointer to a child structure 2611 */ 2612 static void 2613 raid_readregenloop(md_raidcs_t *cs) 2614 { 2615 mr_unit_t *un; 2616 md_raidps_t *ps; 2617 uint_t *dbuf; 2618 uint_t *pbuf; 2619 size_t wordcnt; 2620 2621 un = cs->cs_un; 2622 2623 /* 2624 * XOR the parity with data bytes, must skip the 2625 * pre-write entry header in all data/parity buffers 2626 */ 2627 wordcnt = cs->cs_bcount / sizeof (uint_t); 2628 dbuf = (uint_t *)(void *)(cs->cs_dbuffer + DEV_BSIZE); 2629 pbuf = (uint_t *)(void *)(cs->cs_pbuffer + DEV_BSIZE); 2630 while (wordcnt--) 2631 *dbuf++ ^= *pbuf++; 2632 2633 /* bump up the loop count */ 2634 cs->cs_loop++; 2635 2636 /* skip the errored component */ 2637 if (cs->cs_loop == cs->cs_dcolumn) 2638 cs->cs_loop++; 2639 2640 if (cs->cs_loop != un->un_totalcolumncnt) { 2641 cs->cs_frags = 1; 2642 raidio(cs, RIO_PARITY | RIO_READ | (cs->cs_loop + 1)); 2643 return; 2644 } 2645 /* reaching the end sof loop */ 2646 ps = cs->cs_ps; 2647 bcopy(cs->cs_dbuffer + DEV_BSIZE, cs->cs_addr, cs->cs_bcount); 2648 raid_free_child(cs, 1); 2649 2650 /* decrement readfrags */ 2651 raid_free_parent(ps, RFP_DECR_READFRAGS | RFP_RLS_LOCK); 2652 } 2653 2654 /* 2655 * NAME: raid_read_io 2656 * DESCRIPTION: RAID metadevice read I/O routine 2657 * PARAMETERS: mr_unit_t *un - pointer to a unit structure 2658 * md_raidcs_t *cs - pointer to a child structure 2659 */ 2660 static void 2661 raid_read_io(mr_unit_t *un, md_raidcs_t *cs) 2662 { 2663 int flag; 2664 void *private; 2665 buf_t *bp; 2666 buf_t *pb = cs->cs_ps->ps_bp; 2667 mr_column_t *column; 2668 2669 flag = cs->cs_strategy_flag; 2670 private = cs->cs_strategy_private; 2671 column = &un->un_column[cs->cs_dcolumn]; 2672 2673 /* 2674 * The component to be read is good, simply set up bp structure 2675 * and call low level md routine doing the read. 2676 */ 2677 2678 if (COLUMN_ISOKAY(un, cs->cs_dcolumn) || 2679 (COLUMN_ISLASTERR(un, cs->cs_dcolumn) && 2680 (cs->cs_flags & MD_RCS_RECOVERY) == 0)) { 2681 dev_t ddi_dev; /* needed for bioclone, so not md_dev64_t */ 2682 ddi_dev = md_dev64_to_dev(column->un_dev); 2683 2684 bp = &cs->cs_dbuf; 2685 bp = md_bioclone(pb, cs->cs_offset, cs->cs_bcount, ddi_dev, 2686 column->un_devstart + cs->cs_blkno, 2687 (int (*)())raid_done, bp, KM_NOSLEEP); 2688 2689 bp->b_chain = (buf_t *)cs; 2690 2691 cs->cs_frags = 1; 2692 cs->cs_error_call = raid_read_error; 2693 cs->cs_retry_call = raid_read_retry; 2694 cs->cs_flags |= MD_RCS_ISCALL; 2695 cs->cs_stage = RAID_READ_DONE; 2696 cs->cs_call = raid_stage; 2697 2698 ASSERT(bp->b_edev != 0); 2699 2700 md_call_strategy(bp, flag, private); 2701 return; 2702 } 2703 2704 /* 2705 * The component to be read is bad, have to go through 2706 * raid specific method to read data from other members. 2707 */ 2708 cs->cs_loop = 0; 2709 /* 2710 * NOTE: always get dbuffer before pbuffer 2711 * and get both buffers before pwslot 2712 * otherwise a deadlock could be introduced. 2713 */ 2714 raid_mapin_buf(cs); 2715 getdbuffer(cs); 2716 getpbuffer(cs); 2717 if (cs->cs_loop == cs->cs_dcolumn) 2718 cs->cs_loop++; 2719 2720 /* zero out data buffer for use as a data sink */ 2721 bzero(cs->cs_dbuffer + DEV_BSIZE, cs->cs_bcount); 2722 cs->cs_stage = RAID_NONE; 2723 cs->cs_call = raid_readregenloop; 2724 cs->cs_error_call = raid_read_error; 2725 cs->cs_retry_call = raid_read_no_retry; 2726 cs->cs_frags = 1; 2727 2728 /* use parity buffer to read other columns */ 2729 raidio(cs, RIO_PARITY | RIO_READ | (cs->cs_loop + 1)); 2730 } 2731 2732 /* 2733 * NAME: raid_read 2734 * DESCRIPTION: RAID metadevice write routine 2735 * PARAMETERS: mr_unit_t *un - pointer to a unit structure 2736 * md_raidcs_t *cs - pointer to a child structure 2737 */ 2738 static int 2739 raid_read(mr_unit_t *un, md_raidcs_t *cs) 2740 { 2741 int error = 0; 2742 md_raidps_t *ps; 2743 mdi_unit_t *ui; 2744 minor_t mnum; 2745 2746 ASSERT(IO_READER_HELD(un)); 2747 ps = cs->cs_ps; 2748 ui = ps->ps_ui; 2749 raid_line_reader_lock(cs, 0); 2750 un = (mr_unit_t *)md_unit_readerlock(ui); 2751 ASSERT(UNIT_STATE(un) != RUS_INIT); 2752 mnum = MD_SID(un); 2753 cs->cs_un = un; 2754 2755 /* make sure the read doesn't go beyond the end of the column */ 2756 if (cs->cs_blkno + cs->cs_blkcnt > 2757 un->un_segsize * un->un_segsincolumn) { 2758 error = ENXIO; 2759 } 2760 if (error) 2761 goto rerror; 2762 2763 if (un->un_state & RUS_REGEN) { 2764 raid_regen_parity(cs); 2765 un = MD_UNIT(mnum); 2766 cs->cs_un = un; 2767 } 2768 2769 raid_read_io(un, cs); 2770 return (0); 2771 2772 rerror: 2773 raid_error_parent(ps, error); 2774 raid_free_child(cs, 1); 2775 /* decrement readfrags */ 2776 raid_free_parent(ps, RFP_DECR_READFRAGS | RFP_RLS_LOCK); 2777 return (0); 2778 } 2779 2780 /* 2781 * NAME: raid_write_err_retry 2782 * DESCRIPTION: RAID metadevice write retry routine 2783 * write was for parity or data only; 2784 * complete write with error, no recovery possible 2785 * PARAMETERS: mr_unit_t *un - pointer to a unit structure 2786 * md_raidcs_t *cs - pointer to a child structure 2787 */ 2788 /*ARGSUSED*/ 2789 static void 2790 raid_write_err_retry(mr_unit_t *un, md_raidcs_t *cs) 2791 { 2792 md_raidps_t *ps = cs->cs_ps; 2793 int flags = RFP_DECR_FRAGS | RFP_RLS_LOCK; 2794 2795 /* decrement pwfrags if needed, and frags */ 2796 if (!(cs->cs_flags & MD_RCS_PWDONE)) 2797 flags |= RFP_DECR_PWFRAGS; 2798 raid_error_parent(ps, EIO); 2799 raid_free_child(cs, 1); 2800 raid_free_parent(ps, flags); 2801 } 2802 2803 /* 2804 * NAME: raid_write_err_retry 2805 * DESCRIPTION: RAID metadevice write retry routine 2806 * write is too far along to retry and parent 2807 * has already been signaled with iodone. 2808 * PARAMETERS: mr_unit_t *un - pointer to a unit structure 2809 * md_raidcs_t *cs - pointer to a child structure 2810 */ 2811 /*ARGSUSED*/ 2812 static void 2813 raid_write_no_retry(mr_unit_t *un, md_raidcs_t *cs) 2814 { 2815 md_raidps_t *ps = cs->cs_ps; 2816 int flags = RFP_DECR_FRAGS | RFP_RLS_LOCK; 2817 2818 /* decrement pwfrags if needed, and frags */ 2819 if (!(cs->cs_flags & MD_RCS_PWDONE)) 2820 flags |= RFP_DECR_PWFRAGS; 2821 raid_free_child(cs, 1); 2822 raid_free_parent(ps, flags); 2823 } 2824 2825 /* 2826 * NAME: raid_write_retry 2827 * DESCRIPTION: RAID metadevice write retry routine 2828 * PARAMETERS: mr_unit_t *un - pointer to a unit structure 2829 * md_raidcs_t *cs - pointer to a child structure 2830 */ 2831 static void 2832 raid_write_retry(mr_unit_t *un, md_raidcs_t *cs) 2833 { 2834 md_raidps_t *ps; 2835 2836 ps = cs->cs_ps; 2837 2838 /* re-initialize the buf_t structure for raid_write() */ 2839 cs->cs_dbuf.b_chain = (struct buf *)cs; 2840 cs->cs_dbuf.b_back = &cs->cs_dbuf; 2841 cs->cs_dbuf.b_forw = &cs->cs_dbuf; 2842 cs->cs_dbuf.b_flags = B_BUSY; /* initialize flags */ 2843 cs->cs_dbuf.b_error = 0; /* initialize error */ 2844 cs->cs_dbuf.b_offset = -1; 2845 /* Initialize semaphores */ 2846 sema_init(&cs->cs_dbuf.b_io, 0, NULL, 2847 SEMA_DEFAULT, NULL); 2848 sema_init(&cs->cs_dbuf.b_sem, 0, NULL, 2849 SEMA_DEFAULT, NULL); 2850 2851 cs->cs_pbuf.b_chain = (struct buf *)cs; 2852 cs->cs_pbuf.b_back = &cs->cs_pbuf; 2853 cs->cs_pbuf.b_forw = &cs->cs_pbuf; 2854 cs->cs_pbuf.b_flags = B_BUSY; /* initialize flags */ 2855 cs->cs_pbuf.b_error = 0; /* initialize error */ 2856 cs->cs_pbuf.b_offset = -1; 2857 sema_init(&cs->cs_pbuf.b_io, 0, NULL, 2858 SEMA_DEFAULT, NULL); 2859 sema_init(&cs->cs_pbuf.b_sem, 0, NULL, 2860 SEMA_DEFAULT, NULL); 2861 2862 cs->cs_hbuf.b_chain = (struct buf *)cs; 2863 cs->cs_hbuf.b_back = &cs->cs_hbuf; 2864 cs->cs_hbuf.b_forw = &cs->cs_hbuf; 2865 cs->cs_hbuf.b_flags = B_BUSY; /* initialize flags */ 2866 cs->cs_hbuf.b_error = 0; /* initialize error */ 2867 cs->cs_hbuf.b_offset = -1; 2868 sema_init(&cs->cs_hbuf.b_io, 0, NULL, 2869 SEMA_DEFAULT, NULL); 2870 sema_init(&cs->cs_hbuf.b_sem, 0, NULL, 2871 SEMA_DEFAULT, NULL); 2872 2873 cs->cs_flags &= ~(MD_RCS_ERROR); 2874 /* 2875 * If we have already done'ed the i/o but have done prewrite 2876 * on this child, then reset PWDONE flag and bump pwfrags before 2877 * restarting i/o. 2878 * If pwfrags is zero, we have already 'iodone'd the i/o so 2879 * leave things alone. We don't want to re-'done' it. 2880 */ 2881 mutex_enter(&ps->ps_mx); 2882 if (cs->cs_flags & MD_RCS_PWDONE) { 2883 cs->cs_flags &= ~MD_RCS_PWDONE; 2884 ps->ps_pwfrags++; 2885 } 2886 mutex_exit(&ps->ps_mx); 2887 raid_write_io(un, cs); 2888 } 2889 2890 /* 2891 * NAME: raid_wrerr 2892 * DESCRIPTION: RAID metadevice write routine 2893 * PARAMETERS: md_raidcs_t *cs - pointer to a child structure 2894 * LOCKS: must obtain unit writer lock while calling raid_error_state 2895 * since a unit or column state transition may take place. 2896 * must obtain unit reader lock to retry I/O. 2897 */ 2898 static void 2899 raid_wrerr(md_raidcs_t *cs) 2900 { 2901 md_raidps_t *ps; 2902 mdi_unit_t *ui; 2903 mr_unit_t *un; 2904 md_raidcbuf_t *cbuf; 2905 2906 ps = cs->cs_ps; 2907 ui = ps->ps_ui; 2908 2909 un = (mr_unit_t *)md_unit_writerlock(ui); 2910 ASSERT(un != 0); 2911 2912 if (cs->cs_dbuf.b_flags & B_ERROR) 2913 (void) raid_error_state(un, &cs->cs_dbuf); 2914 if (cs->cs_pbuf.b_flags & B_ERROR) 2915 (void) raid_error_state(un, &cs->cs_pbuf); 2916 if (cs->cs_hbuf.b_flags & B_ERROR) 2917 (void) raid_error_state(un, &cs->cs_hbuf); 2918 for (cbuf = cs->cs_buflist; cbuf; cbuf = cbuf->cbuf_next) 2919 if (cbuf->cbuf_bp.b_flags & B_ERROR) 2920 (void) raid_error_state(un, &cbuf->cbuf_bp); 2921 2922 md_unit_writerexit(ui); 2923 2924 ps->ps_flags |= MD_RPS_HSREQ; 2925 2926 un = (mr_unit_t *)md_unit_readerlock(ui); 2927 2928 /* now attempt the appropriate retry routine */ 2929 (*(cs->cs_retry_call))(un, cs); 2930 } 2931 /* 2932 * NAMES: raid_write_error 2933 * DESCRIPTION: I/O error handling routine for a RAID metadevice write 2934 * PARAMETERS: md_raidcs_t *cs - pointer to child structure 2935 */ 2936 /*ARGSUSED*/ 2937 static void 2938 raid_write_error(md_raidcs_t *cs) 2939 { 2940 md_raidps_t *ps; 2941 mdi_unit_t *ui; 2942 mr_unit_t *un; 2943 md_raidcbuf_t *cbuf; 2944 set_t setno; 2945 2946 ps = cs->cs_ps; 2947 ui = ps->ps_ui; 2948 un = cs->cs_un; 2949 2950 setno = MD_UN2SET(un); 2951 2952 /* 2953 * locate each buf that is in error on this io and then 2954 * output an error message 2955 */ 2956 if ((cs->cs_dbuf.b_flags & B_ERROR) && 2957 (COLUMN_STATE(un, cs->cs_dcolumn) != RCS_ERRED) && 2958 (COLUMN_STATE(un, cs->cs_dcolumn) != RCS_LAST_ERRED)) 2959 cmn_err(CE_WARN, "md %s: write error on %s", 2960 md_shortname(MD_SID(un)), 2961 md_devname(setno, md_expldev(cs->cs_dbuf.b_edev), NULL, 0)); 2962 2963 if ((cs->cs_pbuf.b_flags & B_ERROR) && 2964 (COLUMN_STATE(un, cs->cs_pcolumn) != RCS_ERRED) && 2965 (COLUMN_STATE(un, cs->cs_pcolumn) != RCS_LAST_ERRED)) 2966 cmn_err(CE_WARN, "md %s: write error on %s", 2967 md_shortname(MD_SID(un)), 2968 md_devname(setno, md_expldev(cs->cs_pbuf.b_edev), NULL, 0)); 2969 2970 for (cbuf = cs->cs_buflist; cbuf; cbuf = cbuf->cbuf_next) 2971 if ((cbuf->cbuf_bp.b_flags & B_ERROR) && 2972 (COLUMN_STATE(un, cbuf->cbuf_column) != RCS_ERRED) && 2973 (COLUMN_STATE(un, cbuf->cbuf_column) != RCS_LAST_ERRED)) 2974 cmn_err(CE_WARN, "md %s: write error on %s", 2975 md_shortname(MD_SID(un)), 2976 md_devname(setno, md_expldev(cbuf->cbuf_bp.b_edev), 2977 NULL, 0)); 2978 2979 md_unit_readerexit(ui); 2980 2981 ASSERT(cs->cs_frags == 0); 2982 2983 /* now schedule processing for possible state change */ 2984 daemon_request(&md_mstr_daemon, raid_wrerr, 2985 (daemon_queue_t *)cs, REQ_OLD); 2986 2987 } 2988 2989 /* 2990 * NAME: raid_write_ponly 2991 * DESCRIPTION: RAID metadevice write routine 2992 * in the case where only the parity column can be written 2993 * PARAMETERS: md_raidcs_t *cs - pointer to a child structure 2994 */ 2995 static void 2996 raid_write_ponly(md_raidcs_t *cs) 2997 { 2998 md_raidps_t *ps; 2999 mr_unit_t *un = cs->cs_un; 3000 3001 ps = cs->cs_ps; 3002 /* decrement pwfrags if needed, but not frags */ 3003 ASSERT(!(cs->cs_flags & MD_RCS_PWDONE)); 3004 raid_free_parent(ps, RFP_DECR_PWFRAGS); 3005 cs->cs_flags |= MD_RCS_PWDONE; 3006 cs->cs_frags = 1; 3007 cs->cs_stage = RAID_WRITE_PONLY_DONE; 3008 cs->cs_call = raid_stage; 3009 cs->cs_error_call = raid_write_error; 3010 cs->cs_retry_call = raid_write_no_retry; 3011 if (WRITE_ALT(un, cs->cs_pcolumn)) { 3012 cs->cs_frags++; 3013 raidio(cs, RIO_ALT | RIO_EXTRA | RIO_PARITY | RIO_WRITE); 3014 } 3015 raidio(cs, RIO_PARITY | RIO_WRITE); 3016 } 3017 3018 /* 3019 * NAME: raid_write_ploop 3020 * DESCRIPTION: RAID metadevice write routine, constructs parity from 3021 * data in other columns. 3022 * PARAMETERS: md_raidcs_t *cs - pointer to a child structure 3023 */ 3024 static void 3025 raid_write_ploop(md_raidcs_t *cs) 3026 { 3027 mr_unit_t *un = cs->cs_un; 3028 uint_t *dbuf; 3029 uint_t *pbuf; 3030 size_t wordcnt; 3031 uint_t psum = 0; 3032 3033 wordcnt = cs->cs_bcount / sizeof (uint_t); 3034 dbuf = (uint_t *)(void *)(cs->cs_dbuffer + DEV_BSIZE); 3035 pbuf = (uint_t *)(void *)(cs->cs_pbuffer + DEV_BSIZE); 3036 while (wordcnt--) 3037 *pbuf++ ^= *dbuf++; 3038 cs->cs_loop++; 3039 3040 /* 3041 * build parity from scratch using new data, 3042 * skip reading the data and parity columns. 3043 */ 3044 while (cs->cs_loop == cs->cs_dcolumn || cs->cs_loop == cs->cs_pcolumn) 3045 cs->cs_loop++; 3046 3047 if (cs->cs_loop != un->un_totalcolumncnt) { 3048 cs->cs_frags = 1; 3049 raidio(cs, RIO_DATA | RIO_READ | (cs->cs_loop + 1)); 3050 return; 3051 } 3052 3053 /* construct checksum for parity buffer */ 3054 wordcnt = cs->cs_bcount / sizeof (uint_t); 3055 pbuf = (uint_t *)(void *)(cs->cs_pbuffer + DEV_BSIZE); 3056 while (wordcnt--) { 3057 psum ^= *pbuf; 3058 pbuf++; 3059 } 3060 RAID_FILLIN_RPW(cs->cs_pbuffer, un, psum, -1, 3061 cs->cs_blkno, cs->cs_blkcnt, cs->cs_pwid, 3062 1, cs->cs_pcolumn, RAID_PWMAGIC); 3063 3064 cs->cs_stage = RAID_NONE; 3065 cs->cs_call = raid_write_ponly; 3066 cs->cs_error_call = raid_write_error; 3067 cs->cs_retry_call = raid_write_err_retry; 3068 cs->cs_frags = 1; 3069 if (WRITE_ALT(un, cs->cs_pcolumn)) { 3070 cs->cs_frags++; 3071 raidio(cs, RIO_ALT | RIO_EXTRA | RIO_PARITY | RIO_PREWRITE); 3072 } 3073 raidio(cs, RIO_PARITY | RIO_PREWRITE); 3074 } 3075 3076 /* 3077 * NAME: raid_write_donly 3078 * DESCRIPTION: RAID metadevice write routine 3079 * Completed writing data to prewrite entry 3080 * in the case where only the data column can be written 3081 * PARAMETERS: md_raidcs_t *cs - pointer to a child structure 3082 */ 3083 static void 3084 raid_write_donly(md_raidcs_t *cs) 3085 { 3086 md_raidps_t *ps; 3087 mr_unit_t *un = cs->cs_un; 3088 3089 ps = cs->cs_ps; 3090 /* WARNING: don't release unit reader lock here... */ 3091 /* decrement pwfrags if needed, but not frags */ 3092 ASSERT(!(cs->cs_flags & MD_RCS_PWDONE)); 3093 raid_free_parent(ps, RFP_DECR_PWFRAGS); 3094 cs->cs_flags |= MD_RCS_PWDONE; 3095 cs->cs_frags = 1; 3096 cs->cs_stage = RAID_WRITE_DONLY_DONE; 3097 cs->cs_call = raid_stage; 3098 cs->cs_error_call = raid_write_error; 3099 cs->cs_retry_call = raid_write_err_retry; 3100 if (WRITE_ALT(un, cs->cs_dcolumn)) { 3101 cs->cs_frags++; 3102 raidio(cs, RIO_ALT | RIO_EXTRA | RIO_DATA | RIO_WRITE); 3103 } 3104 raidio(cs, RIO_DATA | RIO_WRITE); 3105 } 3106 3107 /* 3108 * NAME: raid_write_got_old 3109 * DESCRIPTION: RAID metadevice write routine 3110 * completed read of old data and old parity 3111 * PARAMETERS: md_raidcs_t *cs - pointer to a child structure 3112 */ 3113 static void 3114 raid_write_got_old(md_raidcs_t *cs) 3115 { 3116 mr_unit_t *un = cs->cs_un; 3117 3118 ASSERT(IO_READER_HELD(cs->cs_un)); 3119 ASSERT(UNIT_READER_HELD(cs->cs_un)); 3120 3121 raid_mapin_buf(cs); 3122 genstandardparity(cs); 3123 cs->cs_frags = 2; 3124 cs->cs_call = raid_stage; 3125 cs->cs_stage = RAID_PREWRITE_DONE; 3126 cs->cs_error_call = raid_write_error; 3127 cs->cs_retry_call = raid_write_retry; 3128 3129 if (WRITE_ALT(un, cs->cs_dcolumn)) { 3130 cs->cs_frags++; 3131 raidio(cs, RIO_ALT | RIO_EXTRA | RIO_DATA | RIO_PREWRITE); 3132 } 3133 3134 if (WRITE_ALT(un, cs->cs_pcolumn)) { 3135 cs->cs_frags++; 3136 raidio(cs, RIO_ALT | RIO_EXTRA | RIO_PARITY | RIO_PREWRITE); 3137 } 3138 ASSERT(cs->cs_frags < 4); 3139 raidio(cs, RIO_DATA | RIO_PREWRITE); 3140 raidio(cs, RIO_PARITY | RIO_PREWRITE); 3141 } 3142 3143 /* 3144 * NAME: raid_write_io 3145 * DESCRIPTION: RAID metadevice write I/O routine 3146 * PARAMETERS: mr_unit_t *un - pointer to a unit structure 3147 * md_raidcs_t *cs - pointer to a child structure 3148 */ 3149 3150 /*ARGSUSED*/ 3151 static void 3152 raid_write_io(mr_unit_t *un, md_raidcs_t *cs) 3153 { 3154 md_raidps_t *ps = cs->cs_ps; 3155 uint_t *dbuf; 3156 uint_t *ubuf; 3157 size_t wordcnt; 3158 uint_t dsum = 0; 3159 int pcheck; 3160 int dcheck; 3161 3162 ASSERT((un->un_column[cs->cs_pcolumn].un_devstate & 3163 RCS_INIT) == 0); 3164 ASSERT((un->un_column[cs->cs_dcolumn].un_devstate & 3165 RCS_INIT) == 0); 3166 ASSERT(IO_READER_HELD(un)); 3167 ASSERT(UNIT_READER_HELD(un)); 3168 ASSERT(cs->cs_flags & MD_RCS_HAVE_PW_SLOTS); 3169 if (cs->cs_flags & MD_RCS_LINE) { 3170 3171 mr_unit_t *un = cs->cs_un; 3172 3173 ASSERT(un->un_origcolumncnt == un->un_totalcolumncnt); 3174 raid_mapin_buf(cs); 3175 cs->cs_frags = un->un_origcolumncnt; 3176 cs->cs_call = raid_stage; 3177 cs->cs_error_call = raid_write_error; 3178 cs->cs_retry_call = raid_write_no_retry; 3179 cs->cs_stage = RAID_LINE_PWDONE; 3180 genlineparity(cs); 3181 return; 3182 } 3183 3184 pcheck = erred_check_line(un, cs, &un->un_column[cs->cs_pcolumn]); 3185 dcheck = erred_check_line(un, cs, &un->un_column[cs->cs_dcolumn]); 3186 cs->cs_resync_check = pcheck << RCL_PARITY_OFFSET || dcheck; 3187 3188 if (pcheck == RCL_ERRED && dcheck == RCL_ERRED) { 3189 int err = EIO; 3190 3191 if ((un->un_column[cs->cs_pcolumn].un_devstate == 3192 RCS_LAST_ERRED) || 3193 (un->un_column[cs->cs_dcolumn].un_devstate == 3194 RCS_LAST_ERRED)) 3195 err = ENXIO; 3196 raid_error_parent(ps, err); 3197 ASSERT(!(cs->cs_flags & MD_RCS_PWDONE)); 3198 raid_free_child(cs, 1); 3199 raid_free_parent(ps, RFP_DECR_FRAGS 3200 | RFP_RLS_LOCK | RFP_DECR_PWFRAGS); 3201 return; 3202 } 3203 3204 if (pcheck & RCL_ERRED) { 3205 /* 3206 * handle case of only having data drive 3207 */ 3208 raid_mapin_buf(cs); 3209 wordcnt = cs->cs_bcount / sizeof (uint_t); 3210 3211 dbuf = (uint_t *)(void *)(cs->cs_dbuffer + DEV_BSIZE); 3212 ubuf = (uint_t *)(void *)(cs->cs_addr); 3213 3214 while (wordcnt--) { 3215 *dbuf = *ubuf; 3216 dsum ^= *ubuf; 3217 dbuf++; 3218 ubuf++; 3219 } 3220 RAID_FILLIN_RPW(cs->cs_dbuffer, un, dsum, -1, 3221 cs->cs_blkno, cs->cs_blkcnt, cs->cs_pwid, 3222 1, cs->cs_dcolumn, RAID_PWMAGIC); 3223 cs->cs_frags = 1; 3224 cs->cs_stage = RAID_NONE; 3225 cs->cs_call = raid_write_donly; 3226 cs->cs_error_call = raid_write_error; 3227 cs->cs_retry_call = raid_write_err_retry; 3228 if (WRITE_ALT(un, cs->cs_dcolumn)) { 3229 cs->cs_frags++; 3230 raidio(cs, RIO_DATA | RIO_ALT | RIO_EXTRA | 3231 RIO_PREWRITE); 3232 } 3233 raidio(cs, RIO_DATA | RIO_PREWRITE); 3234 return; 3235 } 3236 3237 if (dcheck & RCL_ERRED) { 3238 /* 3239 * handle case of only having parity drive 3240 * build parity from scratch using new data, 3241 * skip reading the data and parity columns. 3242 */ 3243 raid_mapin_buf(cs); 3244 cs->cs_loop = 0; 3245 while (cs->cs_loop == cs->cs_dcolumn || 3246 cs->cs_loop == cs->cs_pcolumn) 3247 cs->cs_loop++; 3248 3249 /* copy new data in to begin building parity */ 3250 bcopy(cs->cs_addr, cs->cs_pbuffer + DEV_BSIZE, cs->cs_bcount); 3251 cs->cs_stage = RAID_NONE; 3252 cs->cs_call = raid_write_ploop; 3253 cs->cs_error_call = raid_write_error; 3254 cs->cs_retry_call = raid_write_err_retry; 3255 cs->cs_frags = 1; 3256 raidio(cs, RIO_DATA | RIO_READ | (cs->cs_loop + 1)); 3257 return; 3258 } 3259 /* 3260 * handle normal cases 3261 * read old data and old parity 3262 */ 3263 cs->cs_frags = 2; 3264 cs->cs_stage = RAID_NONE; 3265 cs->cs_call = raid_write_got_old; 3266 cs->cs_error_call = raid_write_error; 3267 cs->cs_retry_call = raid_write_retry; 3268 ASSERT(ps->ps_magic == RAID_PSMAGIC); 3269 raidio(cs, RIO_DATA | RIO_READ); 3270 raidio(cs, RIO_PARITY | RIO_READ); 3271 } 3272 3273 static void 3274 raid_enqueue(md_raidcs_t *cs) 3275 { 3276 mdi_unit_t *ui = cs->cs_ps->ps_ui; 3277 kmutex_t *io_list_mutex = &ui->ui_io_lock->io_list_mutex; 3278 md_raidcs_t *cs1; 3279 3280 mutex_enter(io_list_mutex); 3281 ASSERT(! (cs->cs_flags & MD_RCS_LLOCKD)); 3282 if (ui->ui_io_lock->io_list_front == NULL) { 3283 ui->ui_io_lock->io_list_front = cs; 3284 ui->ui_io_lock->io_list_back = cs; 3285 } else { 3286 cs1 = ui->ui_io_lock->io_list_back; 3287 cs1->cs_linlck_next = cs; 3288 ui->ui_io_lock->io_list_back = cs; 3289 } 3290 STAT_INC(raid_write_waits); 3291 STAT_MAX(raid_max_write_q_length, raid_write_queue_length); 3292 cs->cs_linlck_next = NULL; 3293 mutex_exit(io_list_mutex); 3294 } 3295 3296 /* 3297 * NAME: raid_write 3298 * DESCRIPTION: RAID metadevice write routine 3299 * PARAMETERS: mr_unit_t *un - pointer to a unit structure 3300 * md_raidcs_t *cs - pointer to a child structure 3301 */ 3302 3303 /*ARGSUSED*/ 3304 static int 3305 raid_write(mr_unit_t *un, md_raidcs_t *cs) 3306 { 3307 int error = 0; 3308 md_raidps_t *ps; 3309 mdi_unit_t *ui; 3310 minor_t mnum; 3311 3312 ASSERT(IO_READER_HELD(un)); 3313 ps = cs->cs_ps; 3314 ui = ps->ps_ui; 3315 3316 ASSERT(UNIT_STATE(un) != RUS_INIT); 3317 if (UNIT_STATE(un) == RUS_LAST_ERRED) 3318 error = EIO; 3319 3320 /* make sure the write doesn't go beyond the column */ 3321 if (cs->cs_blkno + cs->cs_blkcnt > un->un_segsize * un->un_segsincolumn) 3322 error = ENXIO; 3323 if (error) 3324 goto werror; 3325 3326 getresources(cs); 3327 3328 /* 3329 * this is an advisory loop that keeps the waiting lists short 3330 * to reduce cpu time. Since there is a race introduced by not 3331 * aquiring all the correct mutexes, use a cv_timedwait to be 3332 * sure the write always will wake up and start. 3333 */ 3334 while (raid_check_pw(cs)) { 3335 mutex_enter(&un->un_mx); 3336 un->un_rflags |= MD_RFLAG_NEEDPW; 3337 STAT_INC(raid_prewrite_waits); 3338 (void) cv_reltimedwait(&un->un_cv, &un->un_mx, md_wr_wait, 3339 TR_CLOCK_TICK); 3340 un->un_rflags &= ~MD_RFLAG_NEEDPW; 3341 mutex_exit(&un->un_mx); 3342 } 3343 3344 if (raid_line_writer_lock(cs, 1)) 3345 return (0); 3346 3347 un = (mr_unit_t *)md_unit_readerlock(ui); 3348 cs->cs_un = un; 3349 mnum = MD_SID(un); 3350 3351 if (un->un_state & RUS_REGEN) { 3352 raid_regen_parity(cs); 3353 un = MD_UNIT(mnum); 3354 cs->cs_un = un; 3355 } 3356 3357 raid_write_io(un, cs); 3358 return (0); 3359 werror: 3360 /* aquire unit reader lock sinc raid_free_child always drops it */ 3361 raid_error_parent(ps, error); 3362 raid_free_child(cs, 0); 3363 /* decrement both pwfrags and frags */ 3364 raid_free_parent(ps, RFP_DECR_PWFRAGS | RFP_DECR_FRAGS | RFP_RLS_LOCK); 3365 return (0); 3366 } 3367 3368 3369 /* 3370 * NAMES: raid_stage 3371 * DESCRIPTION: post-processing routine for a RAID metadevice 3372 * PARAMETERS: md_raidcs_t *cs - pointer to child structure 3373 */ 3374 static void 3375 raid_stage(md_raidcs_t *cs) 3376 { 3377 md_raidps_t *ps = cs->cs_ps; 3378 mr_unit_t *un = cs->cs_un; 3379 md_raidcbuf_t *cbuf; 3380 buf_t *bp; 3381 void *private; 3382 int flag; 3383 3384 switch (cs->cs_stage) { 3385 case RAID_READ_DONE: 3386 raid_free_child(cs, 1); 3387 /* decrement readfrags */ 3388 raid_free_parent(ps, RFP_DECR_READFRAGS | RFP_RLS_LOCK); 3389 return; 3390 3391 case RAID_WRITE_DONE: 3392 case RAID_WRITE_PONLY_DONE: 3393 case RAID_WRITE_DONLY_DONE: 3394 /* 3395 * Completed writing real parity and/or data. 3396 */ 3397 ASSERT(cs->cs_flags & MD_RCS_PWDONE); 3398 raid_free_child(cs, 1); 3399 /* decrement frags but not pwfrags */ 3400 raid_free_parent(ps, RFP_DECR_FRAGS | RFP_RLS_LOCK); 3401 return; 3402 3403 case RAID_PREWRITE_DONE: 3404 /* 3405 * completed writing data and parity to prewrite entries 3406 */ 3407 /* 3408 * WARNING: don't release unit reader lock here.. 3409 * decrement pwfrags but not frags 3410 */ 3411 raid_free_parent(ps, RFP_DECR_PWFRAGS); 3412 cs->cs_flags |= MD_RCS_PWDONE; 3413 cs->cs_frags = 2; 3414 cs->cs_stage = RAID_WRITE_DONE; 3415 cs->cs_call = raid_stage; 3416 cs->cs_error_call = raid_write_error; 3417 cs->cs_retry_call = raid_write_no_retry; 3418 if (WRITE_ALT(un, cs->cs_pcolumn)) { 3419 cs->cs_frags++; 3420 raidio(cs, RIO_ALT | RIO_EXTRA | RIO_PARITY | 3421 RIO_WRITE); 3422 } 3423 if (WRITE_ALT(un, cs->cs_dcolumn)) { 3424 cs->cs_frags++; 3425 raidio(cs, RIO_ALT | RIO_EXTRA | RIO_DATA | RIO_WRITE); 3426 } 3427 ASSERT(cs->cs_frags < 4); 3428 raidio(cs, RIO_DATA | RIO_WRITE); 3429 raidio(cs, RIO_PARITY | RIO_WRITE); 3430 if (cs->cs_pw_inval_list) { 3431 raid_free_pwinvalidate(cs); 3432 } 3433 return; 3434 3435 case RAID_LINE_PWDONE: 3436 ASSERT(cs->cs_frags == 0); 3437 raid_free_parent(ps, RFP_DECR_PWFRAGS); 3438 cs->cs_flags |= MD_RCS_PWDONE; 3439 cs->cs_frags = un->un_origcolumncnt; 3440 cs->cs_call = raid_stage; 3441 cs->cs_error_call = raid_write_error; 3442 cs->cs_retry_call = raid_write_no_retry; 3443 cs->cs_stage = RAID_WRITE_DONE; 3444 for (cbuf = cs->cs_buflist; cbuf; cbuf = cbuf->cbuf_next) { 3445 /* 3446 * fill in buffer for write to prewrite area 3447 */ 3448 bp = &cbuf->cbuf_bp; 3449 bp->b_back = bp; 3450 bp->b_forw = bp; 3451 bp->b_un.b_addr = cbuf->cbuf_buffer + DEV_BSIZE; 3452 bp->b_bcount = cbuf->cbuf_bcount; 3453 bp->b_bufsize = cbuf->cbuf_bcount; 3454 bp->b_lblkno = 3455 un->un_column[cbuf->cbuf_column].un_devstart + 3456 cs->cs_blkno; 3457 bp->b_flags &= ~(B_READ | B_WRITE | B_ERROR); 3458 bp->b_flags &= ~nv_available; 3459 bp->b_flags |= B_WRITE | B_BUSY; 3460 bp->b_iodone = (int (*)())raid_done; 3461 bp->b_edev = md_dev64_to_dev( 3462 un->un_column[cbuf->cbuf_column].un_dev); 3463 bp->b_chain = (struct buf *)cs; 3464 private = cs->cs_strategy_private; 3465 flag = cs->cs_strategy_flag; 3466 md_call_strategy(bp, flag, private); 3467 } 3468 raidio(cs, RIO_DATA | RIO_WRITE); 3469 raidio(cs, RIO_PARITY | RIO_WRITE); 3470 if (cs->cs_pw_inval_list) { 3471 raid_free_pwinvalidate(cs); 3472 } 3473 return; 3474 3475 default: 3476 ASSERT(0); 3477 break; 3478 } 3479 } 3480 /* 3481 * NAME: md_raid_strategy 3482 * DESCRIPTION: RAID metadevice I/O oprations entry point. 3483 * PARAMETERS: buf_t *pb - pointer to a user I/O buffer 3484 * int flag - metadevice specific flag 3485 * void *private - carry over flag ?? 3486 * 3487 */ 3488 3489 void 3490 md_raid_strategy(buf_t *pb, int flag, void *private) 3491 { 3492 md_raidps_t *ps; 3493 md_raidcs_t *cs; 3494 int doing_writes; 3495 int err; 3496 mr_unit_t *un; 3497 mdi_unit_t *ui; 3498 size_t count; 3499 diskaddr_t blkno; 3500 caddr_t addr; 3501 off_t offset; 3502 int colcnt; 3503 minor_t mnum; 3504 set_t setno; 3505 3506 ui = MDI_UNIT(getminor(pb->b_edev)); 3507 md_kstat_waitq_enter(ui); 3508 un = (mr_unit_t *)md_io_readerlock(ui); 3509 setno = MD_MIN2SET(getminor(pb->b_edev)); 3510 3511 if ((flag & MD_NOBLOCK) == 0) { 3512 if (md_inc_iocount(setno) != 0) { 3513 pb->b_flags |= B_ERROR; 3514 pb->b_error = ENXIO; 3515 pb->b_resid = pb->b_bcount; 3516 md_kstat_waitq_exit(ui); 3517 md_io_readerexit(ui); 3518 biodone(pb); 3519 return; 3520 } 3521 } else { 3522 md_inc_iocount_noblock(setno); 3523 } 3524 3525 mnum = MD_SID(un); 3526 colcnt = un->un_totalcolumncnt - 1; 3527 count = pb->b_bcount; 3528 3529 STAT_CHECK(raid_512, count == 512); 3530 STAT_CHECK(raid_1024, count == 1024); 3531 STAT_CHECK(raid_1024_8192, count > 1024 && count < 8192); 3532 STAT_CHECK(raid_8192, count == 8192); 3533 STAT_CHECK(raid_8192_bigger, count > 8192); 3534 3535 (void *) md_unit_readerlock(ui); 3536 if (!(flag & MD_STR_NOTTOP)) { 3537 err = md_checkbuf(ui, (md_unit_t *)un, pb); /* check and map */ 3538 if (err != 0) { 3539 md_kstat_waitq_exit(ui); 3540 md_io_readerexit(ui); 3541 return; 3542 } 3543 } 3544 md_unit_readerexit(ui); 3545 3546 STAT_INC(raid_total_io); 3547 3548 /* allocate a parent structure for the user I/O */ 3549 ps = kmem_cache_alloc(raid_parent_cache, MD_ALLOCFLAGS); 3550 raid_parent_init(ps); 3551 3552 /* 3553 * Save essential information from the original buffhdr 3554 * in the md_save structure. 3555 */ 3556 ps->ps_un = un; 3557 ps->ps_ui = ui; 3558 ps->ps_bp = pb; 3559 ps->ps_addr = pb->b_un.b_addr; 3560 3561 if ((pb->b_flags & B_READ) == 0) { 3562 ps->ps_flags |= MD_RPS_WRITE; 3563 doing_writes = 1; 3564 STAT_INC(raid_writes); 3565 } else { 3566 ps->ps_flags |= MD_RPS_READ; 3567 doing_writes = 0; 3568 STAT_INC(raid_reads); 3569 } 3570 3571 count = lbtodb(pb->b_bcount); /* transfer count (in blocks) */ 3572 blkno = pb->b_lblkno; /* block number on device */ 3573 addr = 0; 3574 offset = 0; 3575 ps->ps_pwfrags = 1; 3576 ps->ps_frags = 1; 3577 md_kstat_waitq_to_runq(ui); 3578 3579 do { 3580 cs = kmem_cache_alloc(raid_child_cache, MD_ALLOCFLAGS); 3581 raid_child_init(cs); 3582 cs->cs_ps = ps; 3583 cs->cs_un = un; 3584 cs->cs_mdunit = mnum; 3585 cs->cs_strategy_flag = flag; 3586 cs->cs_strategy_private = private; 3587 cs->cs_addr = addr; 3588 cs->cs_offset = offset; 3589 count = raid_iosetup(un, blkno, count, cs); 3590 if (cs->cs_flags & MD_RCS_LINE) { 3591 blkno += (cs->cs_blkcnt * colcnt); 3592 offset += (cs->cs_bcount * colcnt); 3593 } else { 3594 blkno += cs->cs_blkcnt; 3595 offset += cs->cs_bcount; 3596 } 3597 /* for each cs bump up the ps_pwfrags and ps_frags fields */ 3598 if (count) { 3599 mutex_enter(&ps->ps_mx); 3600 ps->ps_pwfrags++; 3601 ps->ps_frags++; 3602 mutex_exit(&ps->ps_mx); 3603 if (doing_writes) 3604 (void) raid_write(un, cs); 3605 else 3606 (void) raid_read(un, cs); 3607 } 3608 } while (count); 3609 if (doing_writes) { 3610 (void) raid_write(un, cs); 3611 } else 3612 (void) raid_read(un, cs); 3613 3614 if (! (flag & MD_STR_NOTTOP) && panicstr) { 3615 while (! (ps->ps_flags & MD_RPS_DONE)) { 3616 md_daemon(1, &md_done_daemon); 3617 drv_usecwait(10); 3618 } 3619 kmem_cache_free(raid_parent_cache, ps); 3620 } 3621 } 3622 3623 /* 3624 * NAMES: raid_snarf 3625 * DESCRIPTION: RAID metadevice SNARF entry point 3626 * PARAMETERS: md_snarfcmd_t cmd, 3627 * set_t setno 3628 * RETURNS: 3629 */ 3630 static int 3631 raid_snarf(md_snarfcmd_t cmd, set_t setno) 3632 { 3633 mr_unit_t *un; 3634 mddb_recid_t recid; 3635 int gotsomething; 3636 int all_raid_gotten; 3637 mddb_type_t typ1; 3638 uint_t ncol; 3639 mddb_de_ic_t *dep; 3640 mddb_rb32_t *rbp; 3641 size_t newreqsize; 3642 mr_unit_t *big_un; 3643 mr_unit32_od_t *small_un; 3644 3645 3646 if (cmd == MD_SNARF_CLEANUP) 3647 return (0); 3648 3649 all_raid_gotten = 1; 3650 gotsomething = 0; 3651 typ1 = (mddb_type_t)md_getshared_key(setno, 3652 raid_md_ops.md_driver.md_drivername); 3653 recid = mddb_makerecid(setno, 0); 3654 3655 while ((recid = mddb_getnextrec(recid, typ1, 0)) > 0) { 3656 if (mddb_getrecprivate(recid) & MD_PRV_GOTIT) { 3657 continue; 3658 } 3659 3660 dep = mddb_getrecdep(recid); 3661 dep->de_flags = MDDB_F_RAID; 3662 rbp = dep->de_rb; 3663 switch (rbp->rb_revision) { 3664 case MDDB_REV_RB: 3665 case MDDB_REV_RBFN: 3666 if ((rbp->rb_private & MD_PRV_CONVD) == 0) { 3667 /* 3668 * This means, we have an old and small record 3669 * and this record hasn't already been 3670 * converted. Before we create an incore 3671 * metadevice from this we have to convert it to 3672 * a big record. 3673 */ 3674 small_un = 3675 (mr_unit32_od_t *)mddb_getrecaddr(recid); 3676 ncol = small_un->un_totalcolumncnt; 3677 newreqsize = sizeof (mr_unit_t) + 3678 ((ncol - 1) * sizeof (mr_column_t)); 3679 big_un = (mr_unit_t *)kmem_zalloc(newreqsize, 3680 KM_SLEEP); 3681 raid_convert((caddr_t)small_un, (caddr_t)big_un, 3682 SMALL_2_BIG); 3683 kmem_free(small_un, dep->de_reqsize); 3684 dep->de_rb_userdata = big_un; 3685 dep->de_reqsize = newreqsize; 3686 un = big_un; 3687 rbp->rb_private |= MD_PRV_CONVD; 3688 } else { 3689 /* 3690 * Record has already been converted. Just 3691 * get its address. 3692 */ 3693 un = (mr_unit_t *)mddb_getrecaddr(recid); 3694 } 3695 un->c.un_revision &= ~MD_64BIT_META_DEV; 3696 break; 3697 case MDDB_REV_RB64: 3698 case MDDB_REV_RB64FN: 3699 /* Big device */ 3700 un = (mr_unit_t *)mddb_getrecaddr(recid); 3701 un->c.un_revision |= MD_64BIT_META_DEV; 3702 un->c.un_flag |= MD_EFILABEL; 3703 break; 3704 } 3705 MDDB_NOTE_FN(rbp->rb_revision, un->c.un_revision); 3706 3707 /* 3708 * Create minor device node for snarfed entry. 3709 */ 3710 (void) md_create_minor_node(MD_MIN2SET(MD_SID(un)), MD_SID(un)); 3711 3712 if (MD_UNIT(MD_SID(un)) != NULL) { 3713 mddb_setrecprivate(recid, MD_PRV_PENDDEL); 3714 continue; 3715 } 3716 all_raid_gotten = 0; 3717 if (raid_build_incore((void *)un, 1) == 0) { 3718 mddb_setrecprivate(recid, MD_PRV_GOTIT); 3719 md_create_unit_incore(MD_SID(un), &raid_md_ops, 1); 3720 gotsomething = 1; 3721 } else if (un->mr_ic) { 3722 kmem_free(un->un_column_ic, sizeof (mr_column_ic_t) * 3723 un->un_totalcolumncnt); 3724 kmem_free(un->mr_ic, sizeof (*un->mr_ic)); 3725 } 3726 } 3727 3728 if (!all_raid_gotten) { 3729 return (gotsomething); 3730 } 3731 3732 recid = mddb_makerecid(setno, 0); 3733 while ((recid = mddb_getnextrec(recid, typ1, 0)) > 0) 3734 if (!(mddb_getrecprivate(recid) & MD_PRV_GOTIT)) 3735 mddb_setrecprivate(recid, MD_PRV_PENDDEL); 3736 3737 return (0); 3738 } 3739 3740 /* 3741 * NAMES: raid_halt 3742 * DESCRIPTION: RAID metadevice HALT entry point 3743 * PARAMETERS: md_haltcmd_t cmd - 3744 * set_t setno - 3745 * RETURNS: 3746 */ 3747 static int 3748 raid_halt(md_haltcmd_t cmd, set_t setno) 3749 { 3750 set_t i; 3751 mdi_unit_t *ui; 3752 minor_t mnum; 3753 3754 if (cmd == MD_HALT_CLOSE) 3755 return (0); 3756 3757 if (cmd == MD_HALT_OPEN) 3758 return (0); 3759 3760 if (cmd == MD_HALT_UNLOAD) 3761 return (0); 3762 3763 if (cmd == MD_HALT_CHECK) { 3764 for (i = 0; i < md_nunits; i++) { 3765 mnum = MD_MKMIN(setno, i); 3766 if ((ui = MDI_UNIT(mnum)) == NULL) 3767 continue; 3768 if (ui->ui_opsindex != raid_md_ops.md_selfindex) 3769 continue; 3770 if (md_unit_isopen(ui)) 3771 return (1); 3772 } 3773 return (0); 3774 } 3775 3776 if (cmd != MD_HALT_DOIT) 3777 return (1); 3778 3779 for (i = 0; i < md_nunits; i++) { 3780 mnum = MD_MKMIN(setno, i); 3781 if ((ui = MDI_UNIT(mnum)) == NULL) 3782 continue; 3783 if (ui->ui_opsindex != raid_md_ops.md_selfindex) 3784 continue; 3785 reset_raid((mr_unit_t *)MD_UNIT(mnum), mnum, 0); 3786 } 3787 return (0); 3788 } 3789 3790 /* 3791 * NAMES: raid_close_all_devs 3792 * DESCRIPTION: Close all the devices of the unit. 3793 * PARAMETERS: mr_unit_t *un - pointer to unit structure 3794 * RETURNS: 3795 */ 3796 void 3797 raid_close_all_devs(mr_unit_t *un, int init_pw, int md_cflags) 3798 { 3799 int i; 3800 mr_column_t *device; 3801 3802 for (i = 0; i < un->un_totalcolumncnt; i++) { 3803 device = &un->un_column[i]; 3804 if (device->un_devflags & MD_RAID_DEV_ISOPEN) { 3805 ASSERT((device->un_dev != (md_dev64_t)0) && 3806 (device->un_dev != NODEV64)); 3807 if ((device->un_devstate & RCS_OKAY) && init_pw) 3808 (void) init_pw_area(un, device->un_dev, 3809 device->un_pwstart, i); 3810 md_layered_close(device->un_dev, md_cflags); 3811 device->un_devflags &= ~MD_RAID_DEV_ISOPEN; 3812 } 3813 } 3814 } 3815 3816 /* 3817 * NAMES: raid_open_all_devs 3818 * DESCRIPTION: Open all the components (columns) of the device unit. 3819 * PARAMETERS: mr_unit_t *un - pointer to unit structure 3820 * RETURNS: 3821 */ 3822 static int 3823 raid_open_all_devs(mr_unit_t *un, int md_oflags) 3824 { 3825 minor_t mnum = MD_SID(un); 3826 int i; 3827 int not_opened = 0; 3828 int commit = 0; 3829 int col = -1; 3830 mr_column_t *device; 3831 set_t setno = MD_MIN2SET(MD_SID(un)); 3832 side_t side = mddb_getsidenum(setno); 3833 mdkey_t key; 3834 mdi_unit_t *ui = MDI_UNIT(mnum); 3835 3836 ui->ui_tstate &= ~MD_INACCESSIBLE; 3837 3838 for (i = 0; i < un->un_totalcolumncnt; i++) { 3839 md_dev64_t tmpdev; 3840 3841 device = &un->un_column[i]; 3842 3843 if (COLUMN_STATE(un, i) & RCS_ERRED) { 3844 not_opened++; 3845 continue; 3846 } 3847 3848 if (device->un_devflags & MD_RAID_DEV_ISOPEN) 3849 continue; 3850 3851 tmpdev = device->un_dev; 3852 /* 3853 * Open by device id 3854 */ 3855 key = HOTSPARED(un, i) ? 3856 device->un_hs_key : device->un_orig_key; 3857 if ((md_getmajor(tmpdev) != md_major) && 3858 md_devid_found(setno, side, key) == 1) { 3859 tmpdev = md_resolve_bydevid(mnum, tmpdev, key); 3860 } 3861 if (md_layered_open(mnum, &tmpdev, md_oflags)) { 3862 device->un_dev = tmpdev; 3863 not_opened++; 3864 continue; 3865 } 3866 device->un_dev = tmpdev; 3867 device->un_devflags |= MD_RAID_DEV_ISOPEN; 3868 } 3869 3870 /* if open errors and errored devices are 1 then device can run */ 3871 if (not_opened > 1) { 3872 cmn_err(CE_WARN, 3873 "md: %s failed to open. open error on %s\n", 3874 md_shortname(MD_SID(un)), 3875 md_devname(MD_UN2SET(un), device->un_orig_dev, NULL, 0)); 3876 3877 ui->ui_tstate |= MD_INACCESSIBLE; 3878 3879 SE_NOTIFY(EC_SVM_STATE, ESC_SVM_OPEN_FAIL, SVM_TAG_METADEVICE, 3880 MD_UN2SET(un), MD_SID(un)); 3881 3882 return (not_opened > 1); 3883 } 3884 3885 for (i = 0; i < un->un_totalcolumncnt; i++) { 3886 device = &un->un_column[i]; 3887 if (device->un_devflags & MD_RAID_DEV_ISOPEN) { 3888 if (device->un_devstate & RCS_LAST_ERRED) { 3889 /* 3890 * At this point in time there is a possibility 3891 * that errors were the result of a controller 3892 * failure with more than a single column on it 3893 * so clear out last errored columns and let errors 3894 * re-occur is necessary. 3895 */ 3896 raid_set_state(un, i, RCS_OKAY, 0); 3897 commit++; 3898 } 3899 continue; 3900 } 3901 ASSERT(col == -1); 3902 col = i; 3903 } 3904 3905 if (col != -1) { 3906 raid_set_state(un, col, RCS_ERRED, 0); 3907 commit++; 3908 } 3909 3910 if (commit) 3911 raid_commit(un, NULL); 3912 3913 if (col != -1) { 3914 if (COLUMN_STATE(un, col) & RCS_ERRED) { 3915 SE_NOTIFY(EC_SVM_STATE, ESC_SVM_ERRED, 3916 SVM_TAG_METADEVICE, MD_UN2SET(un), MD_SID(un)); 3917 } else if (COLUMN_STATE(un, col) & RCS_LAST_ERRED) { 3918 SE_NOTIFY(EC_SVM_STATE, ESC_SVM_LASTERRED, 3919 SVM_TAG_METADEVICE, MD_UN2SET(un), MD_SID(un)); 3920 } 3921 } 3922 3923 return (0); 3924 } 3925 3926 /* 3927 * NAMES: raid_internal_open 3928 * DESCRIPTION: Do the actual RAID open 3929 * PARAMETERS: minor_t mnum - minor number of the RAID device 3930 * int flag - 3931 * int otyp - 3932 * int md_oflags - RAID open flags 3933 * RETURNS: 0 if successful, nonzero otherwise 3934 */ 3935 int 3936 raid_internal_open(minor_t mnum, int flag, int otyp, int md_oflags) 3937 { 3938 mr_unit_t *un; 3939 mdi_unit_t *ui; 3940 int err = 0; 3941 int replay_error = 0; 3942 3943 ui = MDI_UNIT(mnum); 3944 ASSERT(ui != NULL); 3945 3946 un = (mr_unit_t *)md_unit_openclose_enter(ui); 3947 /* 3948 * this MUST be checked before md_unit_isopen is checked. 3949 * raid_init_columns sets md_unit_isopen to block reset, halt. 3950 */ 3951 if ((UNIT_STATE(un) & (RUS_INIT | RUS_DOI)) && 3952 !(md_oflags & MD_OFLG_ISINIT)) { 3953 md_unit_openclose_exit(ui); 3954 return (EAGAIN); 3955 } 3956 3957 if ((md_oflags & MD_OFLG_ISINIT) || md_unit_isopen(ui)) { 3958 err = md_unit_incopen(mnum, flag, otyp); 3959 goto out; 3960 } 3961 3962 md_unit_readerexit(ui); 3963 3964 un = (mr_unit_t *)md_unit_writerlock(ui); 3965 if (raid_open_all_devs(un, md_oflags) == 0) { 3966 if ((err = md_unit_incopen(mnum, flag, otyp)) != 0) { 3967 md_unit_writerexit(ui); 3968 un = (mr_unit_t *)md_unit_readerlock(ui); 3969 raid_close_all_devs(un, 0, md_oflags); 3970 goto out; 3971 } 3972 } else { 3973 /* 3974 * if this unit contains more than two errored components 3975 * should return error and close all opened devices 3976 */ 3977 3978 md_unit_writerexit(ui); 3979 un = (mr_unit_t *)md_unit_readerlock(ui); 3980 raid_close_all_devs(un, 0, md_oflags); 3981 md_unit_openclose_exit(ui); 3982 SE_NOTIFY(EC_SVM_STATE, ESC_SVM_OPEN_FAIL, SVM_TAG_METADEVICE, 3983 MD_UN2SET(un), MD_SID(un)); 3984 return (ENXIO); 3985 } 3986 3987 if (!(MD_STATUS(un) & MD_UN_REPLAYED)) { 3988 replay_error = raid_replay(un); 3989 MD_STATUS(un) |= MD_UN_REPLAYED; 3990 } 3991 3992 md_unit_writerexit(ui); 3993 un = (mr_unit_t *)md_unit_readerlock(ui); 3994 3995 if ((replay_error == RAID_RPLY_READONLY) && 3996 ((flag & (FREAD | FWRITE)) == FREAD)) { 3997 md_unit_openclose_exit(ui); 3998 return (0); 3999 } 4000 4001 /* allocate hotspare if possible */ 4002 (void) raid_hotspares(); 4003 4004 4005 out: 4006 md_unit_openclose_exit(ui); 4007 return (err); 4008 } 4009 /* 4010 * NAMES: raid_open 4011 * DESCRIPTION: RAID metadevice OPEN entry point 4012 * PARAMETERS: dev_t dev - 4013 * int flag - 4014 * int otyp - 4015 * cred_t * cred_p - 4016 * int md_oflags - 4017 * RETURNS: 4018 */ 4019 /*ARGSUSED1*/ 4020 static int 4021 raid_open(dev_t *dev, int flag, int otyp, cred_t *cred_p, int md_oflags) 4022 { 4023 int error = 0; 4024 4025 if (error = raid_internal_open(getminor(*dev), flag, otyp, md_oflags)) { 4026 return (error); 4027 } 4028 return (0); 4029 } 4030 4031 /* 4032 * NAMES: raid_internal_close 4033 * DESCRIPTION: RAID metadevice CLOSE actual implementation 4034 * PARAMETERS: minor_t - minor number of the RAID device 4035 * int otyp - 4036 * int init_pw - 4037 * int md_cflags - RAID close flags 4038 * RETURNS: 0 if successful, nonzero otherwise 4039 */ 4040 /*ARGSUSED*/ 4041 int 4042 raid_internal_close(minor_t mnum, int otyp, int init_pw, int md_cflags) 4043 { 4044 mdi_unit_t *ui = MDI_UNIT(mnum); 4045 mr_unit_t *un; 4046 int err = 0; 4047 4048 /* single thread */ 4049 un = (mr_unit_t *)md_unit_openclose_enter(ui); 4050 4051 /* count closed */ 4052 if ((err = md_unit_decopen(mnum, otyp)) != 0) 4053 goto out; 4054 /* close devices, if necessary */ 4055 if (! md_unit_isopen(ui) || (md_cflags & MD_OFLG_PROBEDEV)) { 4056 raid_close_all_devs(un, init_pw, md_cflags); 4057 } 4058 4059 /* unlock, return success */ 4060 out: 4061 md_unit_openclose_exit(ui); 4062 return (err); 4063 } 4064 4065 /* 4066 * NAMES: raid_close 4067 * DESCRIPTION: RAID metadevice close entry point 4068 * PARAMETERS: dev_t dev - 4069 * int flag - 4070 * int otyp - 4071 * cred_t * cred_p - 4072 * int md_oflags - 4073 * RETURNS: 4074 */ 4075 /*ARGSUSED1*/ 4076 static int 4077 raid_close(dev_t dev, int flag, int otyp, cred_t *cred_p, int md_cflags) 4078 { 4079 int retval; 4080 4081 (void) md_io_writerlock(MDI_UNIT(getminor(dev))); 4082 retval = raid_internal_close(getminor(dev), otyp, 1, md_cflags); 4083 (void) md_io_writerexit(MDI_UNIT(getminor(dev))); 4084 return (retval); 4085 } 4086 4087 /* 4088 * raid_probe_close_all_devs 4089 */ 4090 void 4091 raid_probe_close_all_devs(mr_unit_t *un) 4092 { 4093 int i; 4094 mr_column_t *device; 4095 4096 for (i = 0; i < un->un_totalcolumncnt; i++) { 4097 device = &un->un_column[i]; 4098 4099 if (device->un_devflags & MD_RAID_DEV_PROBEOPEN) { 4100 md_layered_close(device->un_dev, 4101 MD_OFLG_PROBEDEV); 4102 device->un_devflags &= ~MD_RAID_DEV_PROBEOPEN; 4103 } 4104 } 4105 } 4106 /* 4107 * Raid_probe_dev: 4108 * 4109 * On entry the unit writerlock is held 4110 */ 4111 static int 4112 raid_probe_dev(mdi_unit_t *ui, minor_t mnum) 4113 { 4114 mr_unit_t *un; 4115 int i; 4116 int not_opened = 0; 4117 int commit = 0; 4118 int col = -1; 4119 mr_column_t *device; 4120 int md_devopen = 0; 4121 4122 if (md_unit_isopen(ui)) 4123 md_devopen++; 4124 4125 un = MD_UNIT(mnum); 4126 /* 4127 * If the state has been set to LAST_ERRED because 4128 * of an error when the raid device was open at some 4129 * point in the past, don't probe. We really don't want 4130 * to reset the state in this case. 4131 */ 4132 if (UNIT_STATE(un) == RUS_LAST_ERRED) 4133 return (0); 4134 4135 ui->ui_tstate &= ~MD_INACCESSIBLE; 4136 4137 for (i = 0; i < un->un_totalcolumncnt; i++) { 4138 md_dev64_t tmpdev; 4139 4140 device = &un->un_column[i]; 4141 if (COLUMN_STATE(un, i) & RCS_ERRED) { 4142 not_opened++; 4143 continue; 4144 } 4145 4146 tmpdev = device->un_dev; 4147 /* 4148 * Currently the flags passed are not needed since 4149 * there cannot be an underlying metadevice. However 4150 * they are kept here for consistency. 4151 * 4152 * Open by device id 4153 */ 4154 tmpdev = md_resolve_bydevid(mnum, tmpdev, HOTSPARED(un, i)? 4155 device->un_hs_key : device->un_orig_key); 4156 if (md_layered_open(mnum, &tmpdev, 4157 MD_OFLG_CONT_ERRS | MD_OFLG_PROBEDEV)) { 4158 device->un_dev = tmpdev; 4159 not_opened++; 4160 continue; 4161 } 4162 device->un_dev = tmpdev; 4163 4164 device->un_devflags |= MD_RAID_DEV_PROBEOPEN; 4165 } 4166 4167 /* 4168 * The code below is careful on setting the LAST_ERRED state. 4169 * 4170 * If open errors and exactly one device has failed we can run. 4171 * If more then one device fails we have to figure out when to set 4172 * LAST_ERRED state. The rationale is to avoid unnecessary resyncs 4173 * since they are painful and time consuming. 4174 * 4175 * When more than one component/column fails there are 2 scenerios. 4176 * 4177 * 1. Metadevice has NOT been opened: In this case, the behavior 4178 * mimics the open symantics. ie. Only the first failed device 4179 * is ERRED and LAST_ERRED is not set. 4180 * 4181 * 2. Metadevice has been opened: Here the read/write sematics are 4182 * followed. The first failed devicce is ERRED and on the next 4183 * failed device LAST_ERRED is set. 4184 */ 4185 4186 if (not_opened > 1 && !md_devopen) { 4187 cmn_err(CE_WARN, 4188 "md: %s failed to open. open error on %s\n", 4189 md_shortname(MD_SID(un)), 4190 md_devname(MD_UN2SET(un), device->un_orig_dev, NULL, 0)); 4191 SE_NOTIFY(EC_SVM_STATE, ESC_SVM_OPEN_FAIL, SVM_TAG_METADEVICE, 4192 MD_UN2SET(un), MD_SID(un)); 4193 raid_probe_close_all_devs(un); 4194 ui->ui_tstate |= MD_INACCESSIBLE; 4195 return (not_opened > 1); 4196 } 4197 4198 if (!md_devopen) { 4199 for (i = 0; i < un->un_totalcolumncnt; i++) { 4200 device = &un->un_column[i]; 4201 if (device->un_devflags & MD_RAID_DEV_PROBEOPEN) { 4202 if (device->un_devstate & RCS_LAST_ERRED) { 4203 /* 4204 * At this point in time there is a 4205 * possibility that errors were the 4206 * result of a controller failure with 4207 * more than a single column on it so 4208 * clear out last errored columns and 4209 * let errors re-occur is necessary. 4210 */ 4211 raid_set_state(un, i, RCS_OKAY, 0); 4212 commit++; 4213 } 4214 continue; 4215 } 4216 ASSERT(col == -1); 4217 /* 4218 * note if multiple devices are failing then only 4219 * the last one is marked as error 4220 */ 4221 col = i; 4222 } 4223 4224 if (col != -1) { 4225 raid_set_state(un, col, RCS_ERRED, 0); 4226 commit++; 4227 } 4228 4229 } else { 4230 for (i = 0; i < un->un_totalcolumncnt; i++) { 4231 device = &un->un_column[i]; 4232 4233 /* if we have LAST_ERRED go ahead and commit. */ 4234 if (un->un_state & RUS_LAST_ERRED) 4235 break; 4236 /* 4237 * could not open the component 4238 */ 4239 4240 if (!(device->un_devflags & MD_RAID_DEV_PROBEOPEN)) { 4241 col = i; 4242 raid_set_state(un, col, RCS_ERRED, 0); 4243 commit++; 4244 } 4245 } 4246 } 4247 4248 if (commit) 4249 raid_commit(un, NULL); 4250 4251 if (col != -1) { 4252 if (COLUMN_STATE(un, col) & RCS_ERRED) { 4253 SE_NOTIFY(EC_SVM_STATE, ESC_SVM_ERRED, 4254 SVM_TAG_METADEVICE, MD_UN2SET(un), MD_SID(un)); 4255 } else if (COLUMN_STATE(un, col) & RCS_LAST_ERRED) { 4256 SE_NOTIFY(EC_SVM_STATE, ESC_SVM_LASTERRED, 4257 SVM_TAG_METADEVICE, MD_UN2SET(un), MD_SID(un)); 4258 } 4259 } 4260 4261 raid_probe_close_all_devs(un); 4262 return (0); 4263 } 4264 4265 static int 4266 raid_imp_set( 4267 set_t setno 4268 ) 4269 { 4270 mddb_recid_t recid; 4271 int i, gotsomething; 4272 mddb_type_t typ1; 4273 mddb_de_ic_t *dep; 4274 mddb_rb32_t *rbp; 4275 mr_unit_t *un64; 4276 mr_unit32_od_t *un32; 4277 md_dev64_t self_devt; 4278 minor_t *self_id; /* minor needs to be updated */ 4279 md_parent_t *parent_id; /* parent needs to be updated */ 4280 mddb_recid_t *record_id; /* record id needs to be updated */ 4281 hsp_t *hsp_id; 4282 4283 gotsomething = 0; 4284 4285 typ1 = (mddb_type_t)md_getshared_key(setno, 4286 raid_md_ops.md_driver.md_drivername); 4287 recid = mddb_makerecid(setno, 0); 4288 4289 while ((recid = mddb_getnextrec(recid, typ1, 0)) > 0) { 4290 if (mddb_getrecprivate(recid) & MD_PRV_GOTIT) 4291 continue; 4292 4293 dep = mddb_getrecdep(recid); 4294 rbp = dep->de_rb; 4295 4296 switch (rbp->rb_revision) { 4297 case MDDB_REV_RB: 4298 case MDDB_REV_RBFN: 4299 /* 4300 * Small device 4301 */ 4302 un32 = (mr_unit32_od_t *)mddb_getrecaddr(recid); 4303 self_id = &(un32->c.un_self_id); 4304 parent_id = &(un32->c.un_parent); 4305 record_id = &(un32->c.un_record_id); 4306 hsp_id = &(un32->un_hsp_id); 4307 4308 for (i = 0; i < un32->un_totalcolumncnt; i++) { 4309 mr_column32_od_t *device; 4310 4311 device = &un32->un_column[i]; 4312 if (!md_update_minor(setno, mddb_getsidenum 4313 (setno), device->un_orig_key)) 4314 goto out; 4315 4316 if (device->un_hs_id != 0) 4317 device->un_hs_id = 4318 MAKERECID(setno, device->un_hs_id); 4319 } 4320 break; 4321 case MDDB_REV_RB64: 4322 case MDDB_REV_RB64FN: 4323 un64 = (mr_unit_t *)mddb_getrecaddr(recid); 4324 self_id = &(un64->c.un_self_id); 4325 parent_id = &(un64->c.un_parent); 4326 record_id = &(un64->c.un_record_id); 4327 hsp_id = &(un64->un_hsp_id); 4328 4329 for (i = 0; i < un64->un_totalcolumncnt; i++) { 4330 mr_column_t *device; 4331 4332 device = &un64->un_column[i]; 4333 if (!md_update_minor(setno, mddb_getsidenum 4334 (setno), device->un_orig_key)) 4335 goto out; 4336 4337 if (device->un_hs_id != 0) 4338 device->un_hs_id = 4339 MAKERECID(setno, device->un_hs_id); 4340 } 4341 break; 4342 } 4343 4344 /* 4345 * If this is a top level and a friendly name metadevice, 4346 * update its minor in the namespace. 4347 */ 4348 if ((*parent_id == MD_NO_PARENT) && 4349 ((rbp->rb_revision == MDDB_REV_RBFN) || 4350 (rbp->rb_revision == MDDB_REV_RB64FN))) { 4351 4352 self_devt = md_makedevice(md_major, *self_id); 4353 if (!md_update_top_device_minor(setno, 4354 mddb_getsidenum(setno), self_devt)) 4355 goto out; 4356 } 4357 4358 /* 4359 * Update unit with the imported setno 4360 */ 4361 mddb_setrecprivate(recid, MD_PRV_GOTIT); 4362 4363 *self_id = MD_MKMIN(setno, MD_MIN2UNIT(*self_id)); 4364 4365 if (*hsp_id != -1) 4366 *hsp_id = MAKERECID(setno, DBID(*hsp_id)); 4367 4368 if (*parent_id != MD_NO_PARENT) 4369 *parent_id = MD_MKMIN(setno, MD_MIN2UNIT(*parent_id)); 4370 *record_id = MAKERECID(setno, DBID(*record_id)); 4371 gotsomething = 1; 4372 } 4373 4374 out: 4375 return (gotsomething); 4376 } 4377 4378 static md_named_services_t raid_named_services[] = { 4379 {raid_hotspares, "poke hotspares" }, 4380 {raid_rename_check, MDRNM_CHECK }, 4381 {raid_rename_lock, MDRNM_LOCK }, 4382 {(intptr_t (*)()) raid_rename_unlock, MDRNM_UNLOCK }, 4383 {(intptr_t (*)()) raid_probe_dev, "probe open test" }, 4384 {NULL, 0 } 4385 }; 4386 4387 md_ops_t raid_md_ops = { 4388 raid_open, /* open */ 4389 raid_close, /* close */ 4390 md_raid_strategy, /* strategy */ 4391 NULL, /* print */ 4392 NULL, /* dump */ 4393 NULL, /* read */ 4394 NULL, /* write */ 4395 md_raid_ioctl, /* ioctl, */ 4396 raid_snarf, /* raid_snarf */ 4397 raid_halt, /* raid_halt */ 4398 NULL, /* aread */ 4399 NULL, /* awrite */ 4400 raid_imp_set, /* import set */ 4401 raid_named_services 4402 }; 4403 4404 static void 4405 init_init() 4406 { 4407 /* default to a second */ 4408 if (md_wr_wait == 0) 4409 md_wr_wait = md_hz >> 1; 4410 4411 raid_parent_cache = kmem_cache_create("md_raid_parent", 4412 sizeof (md_raidps_t), 0, raid_parent_constructor, 4413 raid_parent_destructor, raid_run_queue, NULL, NULL, 0); 4414 raid_child_cache = kmem_cache_create("md_raid_child", 4415 sizeof (md_raidcs_t) - sizeof (buf_t) + biosize(), 0, 4416 raid_child_constructor, raid_child_destructor, 4417 raid_run_queue, NULL, NULL, 0); 4418 raid_cbuf_cache = kmem_cache_create("md_raid_cbufs", 4419 sizeof (md_raidcbuf_t), 0, raid_cbuf_constructor, 4420 raid_cbuf_destructor, raid_run_queue, NULL, NULL, 0); 4421 } 4422 4423 static void 4424 fini_uninit() 4425 { 4426 kmem_cache_destroy(raid_parent_cache); 4427 kmem_cache_destroy(raid_child_cache); 4428 kmem_cache_destroy(raid_cbuf_cache); 4429 raid_parent_cache = raid_child_cache = raid_cbuf_cache = NULL; 4430 } 4431 4432 /* define the module linkage */ 4433 MD_PLUGIN_MISC_MODULE("raid module", init_init(), fini_uninit()) 4434
Indexes created Wed Feb 10 05:58:14 UTC 2010
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