Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/geom/raid/tr_raid1.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /*- 2 * Copyright (c) 2010 Alexander Motin <mav@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/bio.h> 32 #include <sys/endian.h> 33 #include <sys/kernel.h> 34 #include <sys/kobj.h> 35 #include <sys/limits.h> 36 #include <sys/lock.h> 37 #include <sys/malloc.h> 38 #include <sys/mutex.h> 39 #include <sys/sysctl.h> 40 #include <sys/systm.h> 41 #include <geom/geom.h> 42 #include "geom/raid/g_raid.h" 43 #include "g_raid_tr_if.h" 44 45 SYSCTL_DECL(_kern_geom_raid_raid1); 46 47 #define RAID1_REBUILD_SLAB (1 << 20) /* One transation in a rebuild */ 48 static int g_raid1_rebuild_slab = RAID1_REBUILD_SLAB; 49 SYSCTL_UINT(_kern_geom_raid_raid1, OID_AUTO, rebuild_slab_size, CTLFLAG_RWTUN, 50 &g_raid1_rebuild_slab, 0, 51 "Amount of the disk to rebuild each read/write cycle of the rebuild."); 52 53 #define RAID1_REBUILD_FAIR_IO 20 /* use 1/x of the available I/O */ 54 static int g_raid1_rebuild_fair_io = RAID1_REBUILD_FAIR_IO; 55 SYSCTL_UINT(_kern_geom_raid_raid1, OID_AUTO, rebuild_fair_io, CTLFLAG_RWTUN, 56 &g_raid1_rebuild_fair_io, 0, 57 "Fraction of the I/O bandwidth to use when disk busy for rebuild."); 58 59 #define RAID1_REBUILD_CLUSTER_IDLE 100 60 static int g_raid1_rebuild_cluster_idle = RAID1_REBUILD_CLUSTER_IDLE; 61 SYSCTL_UINT(_kern_geom_raid_raid1, OID_AUTO, rebuild_cluster_idle, CTLFLAG_RWTUN, 62 &g_raid1_rebuild_cluster_idle, 0, 63 "Number of slabs to do each time we trigger a rebuild cycle"); 64 65 #define RAID1_REBUILD_META_UPDATE 1024 /* update meta data every 1GB or so */ 66 static int g_raid1_rebuild_meta_update = RAID1_REBUILD_META_UPDATE; 67 SYSCTL_UINT(_kern_geom_raid_raid1, OID_AUTO, rebuild_meta_update, CTLFLAG_RWTUN, 68 &g_raid1_rebuild_meta_update, 0, 69 "When to update the meta data."); 70 71 static MALLOC_DEFINE(M_TR_RAID1, "tr_raid1_data", "GEOM_RAID RAID1 data"); 72 73 #define TR_RAID1_NONE 0 74 #define TR_RAID1_REBUILD 1 75 #define TR_RAID1_RESYNC 2 76 77 #define TR_RAID1_F_DOING_SOME 0x1 78 #define TR_RAID1_F_LOCKED 0x2 79 #define TR_RAID1_F_ABORT 0x4 80 81 struct g_raid_tr_raid1_object { 82 struct g_raid_tr_object trso_base; 83 int trso_starting; 84 int trso_stopping; 85 int trso_type; 86 int trso_recover_slabs; /* slabs before rest */ 87 int trso_fair_io; 88 int trso_meta_update; 89 int trso_flags; 90 struct g_raid_subdisk *trso_failed_sd; /* like per volume */ 91 void *trso_buffer; /* Buffer space */ 92 struct bio trso_bio; 93 }; 94 95 static g_raid_tr_taste_t g_raid_tr_taste_raid1; 96 static g_raid_tr_event_t g_raid_tr_event_raid1; 97 static g_raid_tr_start_t g_raid_tr_start_raid1; 98 static g_raid_tr_stop_t g_raid_tr_stop_raid1; 99 static g_raid_tr_iostart_t g_raid_tr_iostart_raid1; 100 static g_raid_tr_iodone_t g_raid_tr_iodone_raid1; 101 static g_raid_tr_kerneldump_t g_raid_tr_kerneldump_raid1; 102 static g_raid_tr_locked_t g_raid_tr_locked_raid1; 103 static g_raid_tr_idle_t g_raid_tr_idle_raid1; 104 static g_raid_tr_free_t g_raid_tr_free_raid1; 105 106 static kobj_method_t g_raid_tr_raid1_methods[] = { 107 KOBJMETHOD(g_raid_tr_taste, g_raid_tr_taste_raid1), 108 KOBJMETHOD(g_raid_tr_event, g_raid_tr_event_raid1), 109 KOBJMETHOD(g_raid_tr_start, g_raid_tr_start_raid1), 110 KOBJMETHOD(g_raid_tr_stop, g_raid_tr_stop_raid1), 111 KOBJMETHOD(g_raid_tr_iostart, g_raid_tr_iostart_raid1), 112 KOBJMETHOD(g_raid_tr_iodone, g_raid_tr_iodone_raid1), 113 KOBJMETHOD(g_raid_tr_kerneldump, g_raid_tr_kerneldump_raid1), 114 KOBJMETHOD(g_raid_tr_locked, g_raid_tr_locked_raid1), 115 KOBJMETHOD(g_raid_tr_idle, g_raid_tr_idle_raid1), 116 KOBJMETHOD(g_raid_tr_free, g_raid_tr_free_raid1), 117 { 0, 0 } 118 }; 119 120 static struct g_raid_tr_class g_raid_tr_raid1_class = { 121 "RAID1", 122 g_raid_tr_raid1_methods, 123 sizeof(struct g_raid_tr_raid1_object), 124 .trc_enable = 1, 125 .trc_priority = 100, 126 .trc_accept_unmapped = 1 127 }; 128 129 static void g_raid_tr_raid1_rebuild_abort(struct g_raid_tr_object *tr); 130 static void g_raid_tr_raid1_maybe_rebuild(struct g_raid_tr_object *tr, 131 struct g_raid_subdisk *sd); 132 133 static int 134 g_raid_tr_taste_raid1(struct g_raid_tr_object *tr, struct g_raid_volume *vol) 135 { 136 struct g_raid_tr_raid1_object *trs; 137 138 trs = (struct g_raid_tr_raid1_object *)tr; 139 if (tr->tro_volume->v_raid_level != G_RAID_VOLUME_RL_RAID1 || 140 (tr->tro_volume->v_raid_level_qualifier != G_RAID_VOLUME_RLQ_R1SM && 141 tr->tro_volume->v_raid_level_qualifier != G_RAID_VOLUME_RLQ_R1MM)) 142 return (G_RAID_TR_TASTE_FAIL); 143 trs->trso_starting = 1; 144 return (G_RAID_TR_TASTE_SUCCEED); 145 } 146 147 static int 148 g_raid_tr_update_state_raid1(struct g_raid_volume *vol, 149 struct g_raid_subdisk *sd) 150 { 151 struct g_raid_tr_raid1_object *trs; 152 struct g_raid_softc *sc; 153 struct g_raid_subdisk *tsd, *bestsd; 154 u_int s; 155 int i, na, ns; 156 157 sc = vol->v_softc; 158 trs = (struct g_raid_tr_raid1_object *)vol->v_tr; 159 if (trs->trso_stopping && 160 (trs->trso_flags & TR_RAID1_F_DOING_SOME) == 0) 161 s = G_RAID_VOLUME_S_STOPPED; 162 else if (trs->trso_starting) 163 s = G_RAID_VOLUME_S_STARTING; 164 else { 165 /* Make sure we have at least one ACTIVE disk. */ 166 na = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_ACTIVE); 167 if (na == 0) { 168 /* 169 * Critical situation! We have no any active disk! 170 * Choose the best disk we have to make it active. 171 */ 172 bestsd = &vol->v_subdisks[0]; 173 for (i = 1; i < vol->v_disks_count; i++) { 174 tsd = &vol->v_subdisks[i]; 175 if (tsd->sd_state > bestsd->sd_state) 176 bestsd = tsd; 177 else if (tsd->sd_state == bestsd->sd_state && 178 (tsd->sd_state == G_RAID_SUBDISK_S_REBUILD || 179 tsd->sd_state == G_RAID_SUBDISK_S_RESYNC) && 180 tsd->sd_rebuild_pos > bestsd->sd_rebuild_pos) 181 bestsd = tsd; 182 } 183 if (bestsd->sd_state >= G_RAID_SUBDISK_S_UNINITIALIZED) { 184 /* We found reasonable candidate. */ 185 G_RAID_DEBUG1(1, sc, 186 "Promote subdisk %s:%d from %s to ACTIVE.", 187 vol->v_name, bestsd->sd_pos, 188 g_raid_subdisk_state2str(bestsd->sd_state)); 189 g_raid_change_subdisk_state(bestsd, 190 G_RAID_SUBDISK_S_ACTIVE); 191 g_raid_write_metadata(sc, 192 vol, bestsd, bestsd->sd_disk); 193 } 194 } 195 na = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_ACTIVE); 196 ns = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_STALE) + 197 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_RESYNC); 198 if (na == vol->v_disks_count) 199 s = G_RAID_VOLUME_S_OPTIMAL; 200 else if (na + ns == vol->v_disks_count) 201 s = G_RAID_VOLUME_S_SUBOPTIMAL; 202 else if (na > 0) 203 s = G_RAID_VOLUME_S_DEGRADED; 204 else 205 s = G_RAID_VOLUME_S_BROKEN; 206 g_raid_tr_raid1_maybe_rebuild(vol->v_tr, sd); 207 } 208 if (s != vol->v_state) { 209 g_raid_event_send(vol, G_RAID_VOLUME_S_ALIVE(s) ? 210 G_RAID_VOLUME_E_UP : G_RAID_VOLUME_E_DOWN, 211 G_RAID_EVENT_VOLUME); 212 g_raid_change_volume_state(vol, s); 213 if (!trs->trso_starting && !trs->trso_stopping) 214 g_raid_write_metadata(sc, vol, NULL, NULL); 215 } 216 return (0); 217 } 218 219 static void 220 g_raid_tr_raid1_fail_disk(struct g_raid_softc *sc, struct g_raid_subdisk *sd, 221 struct g_raid_disk *disk) 222 { 223 /* 224 * We don't fail the last disk in the pack, since it still has decent 225 * data on it and that's better than failing the disk if it is the root 226 * file system. 227 * 228 * XXX should this be controlled via a tunable? It makes sense for 229 * the volume that has / on it. I can't think of a case where we'd 230 * want the volume to go away on this kind of event. 231 */ 232 if (g_raid_nsubdisks(sd->sd_volume, G_RAID_SUBDISK_S_ACTIVE) == 1 && 233 g_raid_get_subdisk(sd->sd_volume, G_RAID_SUBDISK_S_ACTIVE) == sd) 234 return; 235 g_raid_fail_disk(sc, sd, disk); 236 } 237 238 static void 239 g_raid_tr_raid1_rebuild_some(struct g_raid_tr_object *tr) 240 { 241 struct g_raid_tr_raid1_object *trs; 242 struct g_raid_subdisk *sd, *good_sd; 243 struct bio *bp; 244 245 trs = (struct g_raid_tr_raid1_object *)tr; 246 if (trs->trso_flags & TR_RAID1_F_DOING_SOME) 247 return; 248 sd = trs->trso_failed_sd; 249 good_sd = g_raid_get_subdisk(sd->sd_volume, G_RAID_SUBDISK_S_ACTIVE); 250 if (good_sd == NULL) { 251 g_raid_tr_raid1_rebuild_abort(tr); 252 return; 253 } 254 bp = &trs->trso_bio; 255 memset(bp, 0, sizeof(*bp)); 256 bp->bio_offset = sd->sd_rebuild_pos; 257 bp->bio_length = MIN(g_raid1_rebuild_slab, 258 sd->sd_size - sd->sd_rebuild_pos); 259 bp->bio_data = trs->trso_buffer; 260 bp->bio_cmd = BIO_READ; 261 bp->bio_cflags = G_RAID_BIO_FLAG_SYNC; 262 bp->bio_caller1 = good_sd; 263 trs->trso_flags |= TR_RAID1_F_DOING_SOME; 264 trs->trso_flags |= TR_RAID1_F_LOCKED; 265 g_raid_lock_range(sd->sd_volume, /* Lock callback starts I/O */ 266 bp->bio_offset, bp->bio_length, NULL, bp); 267 } 268 269 static void 270 g_raid_tr_raid1_rebuild_done(struct g_raid_tr_raid1_object *trs) 271 { 272 struct g_raid_volume *vol; 273 struct g_raid_subdisk *sd; 274 275 vol = trs->trso_base.tro_volume; 276 sd = trs->trso_failed_sd; 277 g_raid_write_metadata(vol->v_softc, vol, sd, sd->sd_disk); 278 free(trs->trso_buffer, M_TR_RAID1); 279 trs->trso_buffer = NULL; 280 trs->trso_flags &= ~TR_RAID1_F_DOING_SOME; 281 trs->trso_type = TR_RAID1_NONE; 282 trs->trso_recover_slabs = 0; 283 trs->trso_failed_sd = NULL; 284 g_raid_tr_update_state_raid1(vol, NULL); 285 } 286 287 static void 288 g_raid_tr_raid1_rebuild_finish(struct g_raid_tr_object *tr) 289 { 290 struct g_raid_tr_raid1_object *trs; 291 struct g_raid_subdisk *sd; 292 293 trs = (struct g_raid_tr_raid1_object *)tr; 294 sd = trs->trso_failed_sd; 295 G_RAID_DEBUG1(0, tr->tro_volume->v_softc, 296 "Subdisk %s:%d-%s rebuild completed.", 297 sd->sd_volume->v_name, sd->sd_pos, 298 sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]"); 299 g_raid_change_subdisk_state(sd, G_RAID_SUBDISK_S_ACTIVE); 300 sd->sd_rebuild_pos = 0; 301 g_raid_tr_raid1_rebuild_done(trs); 302 } 303 304 static void 305 g_raid_tr_raid1_rebuild_abort(struct g_raid_tr_object *tr) 306 { 307 struct g_raid_tr_raid1_object *trs; 308 struct g_raid_subdisk *sd; 309 struct g_raid_volume *vol; 310 off_t len; 311 312 vol = tr->tro_volume; 313 trs = (struct g_raid_tr_raid1_object *)tr; 314 sd = trs->trso_failed_sd; 315 if (trs->trso_flags & TR_RAID1_F_DOING_SOME) { 316 G_RAID_DEBUG1(1, vol->v_softc, 317 "Subdisk %s:%d-%s rebuild is aborting.", 318 sd->sd_volume->v_name, sd->sd_pos, 319 sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]"); 320 trs->trso_flags |= TR_RAID1_F_ABORT; 321 } else { 322 G_RAID_DEBUG1(0, vol->v_softc, 323 "Subdisk %s:%d-%s rebuild aborted.", 324 sd->sd_volume->v_name, sd->sd_pos, 325 sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]"); 326 trs->trso_flags &= ~TR_RAID1_F_ABORT; 327 if (trs->trso_flags & TR_RAID1_F_LOCKED) { 328 trs->trso_flags &= ~TR_RAID1_F_LOCKED; 329 len = MIN(g_raid1_rebuild_slab, 330 sd->sd_size - sd->sd_rebuild_pos); 331 g_raid_unlock_range(tr->tro_volume, 332 sd->sd_rebuild_pos, len); 333 } 334 g_raid_tr_raid1_rebuild_done(trs); 335 } 336 } 337 338 static void 339 g_raid_tr_raid1_rebuild_start(struct g_raid_tr_object *tr) 340 { 341 struct g_raid_volume *vol; 342 struct g_raid_tr_raid1_object *trs; 343 struct g_raid_subdisk *sd, *fsd; 344 345 vol = tr->tro_volume; 346 trs = (struct g_raid_tr_raid1_object *)tr; 347 if (trs->trso_failed_sd) { 348 G_RAID_DEBUG1(1, vol->v_softc, 349 "Already rebuild in start rebuild. pos %jd\n", 350 (intmax_t)trs->trso_failed_sd->sd_rebuild_pos); 351 return; 352 } 353 sd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_ACTIVE); 354 if (sd == NULL) { 355 G_RAID_DEBUG1(1, vol->v_softc, 356 "No active disk to rebuild. night night."); 357 return; 358 } 359 fsd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_RESYNC); 360 if (fsd == NULL) 361 fsd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_REBUILD); 362 if (fsd == NULL) { 363 fsd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_STALE); 364 if (fsd != NULL) { 365 fsd->sd_rebuild_pos = 0; 366 g_raid_change_subdisk_state(fsd, 367 G_RAID_SUBDISK_S_RESYNC); 368 g_raid_write_metadata(vol->v_softc, vol, fsd, NULL); 369 } else { 370 fsd = g_raid_get_subdisk(vol, 371 G_RAID_SUBDISK_S_UNINITIALIZED); 372 if (fsd == NULL) 373 fsd = g_raid_get_subdisk(vol, 374 G_RAID_SUBDISK_S_NEW); 375 if (fsd != NULL) { 376 fsd->sd_rebuild_pos = 0; 377 g_raid_change_subdisk_state(fsd, 378 G_RAID_SUBDISK_S_REBUILD); 379 g_raid_write_metadata(vol->v_softc, 380 vol, fsd, NULL); 381 } 382 } 383 } 384 if (fsd == NULL) { 385 G_RAID_DEBUG1(1, vol->v_softc, 386 "No failed disk to rebuild. night night."); 387 return; 388 } 389 trs->trso_failed_sd = fsd; 390 G_RAID_DEBUG1(0, vol->v_softc, 391 "Subdisk %s:%d-%s rebuild start at %jd.", 392 fsd->sd_volume->v_name, fsd->sd_pos, 393 fsd->sd_disk ? g_raid_get_diskname(fsd->sd_disk) : "[none]", 394 trs->trso_failed_sd->sd_rebuild_pos); 395 trs->trso_type = TR_RAID1_REBUILD; 396 trs->trso_buffer = malloc(g_raid1_rebuild_slab, M_TR_RAID1, M_WAITOK); 397 trs->trso_meta_update = g_raid1_rebuild_meta_update; 398 g_raid_tr_raid1_rebuild_some(tr); 399 } 400 401 402 static void 403 g_raid_tr_raid1_maybe_rebuild(struct g_raid_tr_object *tr, 404 struct g_raid_subdisk *sd) 405 { 406 struct g_raid_volume *vol; 407 struct g_raid_tr_raid1_object *trs; 408 int na, nr; 409 410 /* 411 * If we're stopping, don't do anything. If we don't have at least one 412 * good disk and one bad disk, we don't do anything. And if there's a 413 * 'good disk' stored in the trs, then we're in progress and we punt. 414 * If we make it past all these checks, we need to rebuild. 415 */ 416 vol = tr->tro_volume; 417 trs = (struct g_raid_tr_raid1_object *)tr; 418 if (trs->trso_stopping) 419 return; 420 na = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_ACTIVE); 421 nr = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_REBUILD) + 422 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_RESYNC); 423 switch(trs->trso_type) { 424 case TR_RAID1_NONE: 425 if (na == 0) 426 return; 427 if (nr == 0) { 428 nr = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_NEW) + 429 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_STALE) + 430 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_UNINITIALIZED); 431 if (nr == 0) 432 return; 433 } 434 g_raid_tr_raid1_rebuild_start(tr); 435 break; 436 case TR_RAID1_REBUILD: 437 if (na == 0 || nr == 0 || trs->trso_failed_sd == sd) 438 g_raid_tr_raid1_rebuild_abort(tr); 439 break; 440 case TR_RAID1_RESYNC: 441 break; 442 } 443 } 444 445 static int 446 g_raid_tr_event_raid1(struct g_raid_tr_object *tr, 447 struct g_raid_subdisk *sd, u_int event) 448 { 449 450 g_raid_tr_update_state_raid1(tr->tro_volume, sd); 451 return (0); 452 } 453 454 static int 455 g_raid_tr_start_raid1(struct g_raid_tr_object *tr) 456 { 457 struct g_raid_tr_raid1_object *trs; 458 struct g_raid_volume *vol; 459 460 trs = (struct g_raid_tr_raid1_object *)tr; 461 vol = tr->tro_volume; 462 trs->trso_starting = 0; 463 g_raid_tr_update_state_raid1(vol, NULL); 464 return (0); 465 } 466 467 static int 468 g_raid_tr_stop_raid1(struct g_raid_tr_object *tr) 469 { 470 struct g_raid_tr_raid1_object *trs; 471 struct g_raid_volume *vol; 472 473 trs = (struct g_raid_tr_raid1_object *)tr; 474 vol = tr->tro_volume; 475 trs->trso_starting = 0; 476 trs->trso_stopping = 1; 477 g_raid_tr_update_state_raid1(vol, NULL); 478 return (0); 479 } 480 481 /* 482 * Select the disk to read from. Take into account: subdisk state, running 483 * error recovery, average disk load, head position and possible cache hits. 484 */ 485 #define ABS(x) (((x) >= 0) ? (x) : (-(x))) 486 static struct g_raid_subdisk * 487 g_raid_tr_raid1_select_read_disk(struct g_raid_volume *vol, struct bio *bp, 488 u_int mask) 489 { 490 struct g_raid_subdisk *sd, *best; 491 int i, prio, bestprio; 492 493 best = NULL; 494 bestprio = INT_MAX; 495 for (i = 0; i < vol->v_disks_count; i++) { 496 sd = &vol->v_subdisks[i]; 497 if (sd->sd_state != G_RAID_SUBDISK_S_ACTIVE && 498 ((sd->sd_state != G_RAID_SUBDISK_S_REBUILD && 499 sd->sd_state != G_RAID_SUBDISK_S_RESYNC) || 500 bp->bio_offset + bp->bio_length > sd->sd_rebuild_pos)) 501 continue; 502 if ((mask & (1 << i)) != 0) 503 continue; 504 prio = G_RAID_SUBDISK_LOAD(sd); 505 prio += min(sd->sd_recovery, 255) << 22; 506 prio += (G_RAID_SUBDISK_S_ACTIVE - sd->sd_state) << 16; 507 /* If disk head is precisely in position - highly prefer it. */ 508 if (G_RAID_SUBDISK_POS(sd) == bp->bio_offset) 509 prio -= 2 * G_RAID_SUBDISK_LOAD_SCALE; 510 else 511 /* If disk head is close to position - prefer it. */ 512 if (ABS(G_RAID_SUBDISK_POS(sd) - bp->bio_offset) < 513 G_RAID_SUBDISK_TRACK_SIZE) 514 prio -= 1 * G_RAID_SUBDISK_LOAD_SCALE; 515 if (prio < bestprio) { 516 best = sd; 517 bestprio = prio; 518 } 519 } 520 return (best); 521 } 522 523 static void 524 g_raid_tr_iostart_raid1_read(struct g_raid_tr_object *tr, struct bio *bp) 525 { 526 struct g_raid_subdisk *sd; 527 struct bio *cbp; 528 529 sd = g_raid_tr_raid1_select_read_disk(tr->tro_volume, bp, 0); 530 KASSERT(sd != NULL, ("No active disks in volume %s.", 531 tr->tro_volume->v_name)); 532 533 cbp = g_clone_bio(bp); 534 if (cbp == NULL) { 535 g_raid_iodone(bp, ENOMEM); 536 return; 537 } 538 539 g_raid_subdisk_iostart(sd, cbp); 540 } 541 542 static void 543 g_raid_tr_iostart_raid1_write(struct g_raid_tr_object *tr, struct bio *bp) 544 { 545 struct g_raid_volume *vol; 546 struct g_raid_subdisk *sd; 547 struct bio_queue_head queue; 548 struct bio *cbp; 549 int i; 550 551 vol = tr->tro_volume; 552 553 /* 554 * Allocate all bios before sending any request, so we can return 555 * ENOMEM in nice and clean way. 556 */ 557 bioq_init(&queue); 558 for (i = 0; i < vol->v_disks_count; i++) { 559 sd = &vol->v_subdisks[i]; 560 switch (sd->sd_state) { 561 case G_RAID_SUBDISK_S_ACTIVE: 562 break; 563 case G_RAID_SUBDISK_S_REBUILD: 564 /* 565 * When rebuilding, only part of this subdisk is 566 * writable, the rest will be written as part of the 567 * that process. 568 */ 569 if (bp->bio_offset >= sd->sd_rebuild_pos) 570 continue; 571 break; 572 case G_RAID_SUBDISK_S_STALE: 573 case G_RAID_SUBDISK_S_RESYNC: 574 /* 575 * Resyncing still writes on the theory that the 576 * resync'd disk is very close and writing it will 577 * keep it that way better if we keep up while 578 * resyncing. 579 */ 580 break; 581 default: 582 continue; 583 } 584 cbp = g_clone_bio(bp); 585 if (cbp == NULL) 586 goto failure; 587 cbp->bio_caller1 = sd; 588 bioq_insert_tail(&queue, cbp); 589 } 590 while ((cbp = bioq_takefirst(&queue)) != NULL) { 591 sd = cbp->bio_caller1; 592 cbp->bio_caller1 = NULL; 593 g_raid_subdisk_iostart(sd, cbp); 594 } 595 return; 596 failure: 597 while ((cbp = bioq_takefirst(&queue)) != NULL) 598 g_destroy_bio(cbp); 599 if (bp->bio_error == 0) 600 bp->bio_error = ENOMEM; 601 g_raid_iodone(bp, bp->bio_error); 602 } 603 604 static void 605 g_raid_tr_iostart_raid1(struct g_raid_tr_object *tr, struct bio *bp) 606 { 607 struct g_raid_volume *vol; 608 struct g_raid_tr_raid1_object *trs; 609 610 vol = tr->tro_volume; 611 trs = (struct g_raid_tr_raid1_object *)tr; 612 if (vol->v_state != G_RAID_VOLUME_S_OPTIMAL && 613 vol->v_state != G_RAID_VOLUME_S_SUBOPTIMAL && 614 vol->v_state != G_RAID_VOLUME_S_DEGRADED) { 615 g_raid_iodone(bp, EIO); 616 return; 617 } 618 /* 619 * If we're rebuilding, squeeze in rebuild activity every so often, 620 * even when the disk is busy. Be sure to only count real I/O 621 * to the disk. All 'SPECIAL' I/O is traffic generated to the disk 622 * by this module. 623 */ 624 if (trs->trso_failed_sd != NULL && 625 !(bp->bio_cflags & G_RAID_BIO_FLAG_SPECIAL)) { 626 /* Make this new or running now round short. */ 627 trs->trso_recover_slabs = 0; 628 if (--trs->trso_fair_io <= 0) { 629 trs->trso_fair_io = g_raid1_rebuild_fair_io; 630 g_raid_tr_raid1_rebuild_some(tr); 631 } 632 } 633 switch (bp->bio_cmd) { 634 case BIO_READ: 635 g_raid_tr_iostart_raid1_read(tr, bp); 636 break; 637 case BIO_WRITE: 638 case BIO_DELETE: 639 g_raid_tr_iostart_raid1_write(tr, bp); 640 break; 641 case BIO_FLUSH: 642 g_raid_tr_flush_common(tr, bp); 643 break; 644 default: 645 KASSERT(1 == 0, ("Invalid command here: %u (volume=%s)", 646 bp->bio_cmd, vol->v_name)); 647 break; 648 } 649 } 650 651 static void 652 g_raid_tr_iodone_raid1(struct g_raid_tr_object *tr, 653 struct g_raid_subdisk *sd, struct bio *bp) 654 { 655 struct bio *cbp; 656 struct g_raid_subdisk *nsd; 657 struct g_raid_volume *vol; 658 struct bio *pbp; 659 struct g_raid_tr_raid1_object *trs; 660 uintptr_t *mask; 661 int error, do_write; 662 663 trs = (struct g_raid_tr_raid1_object *)tr; 664 vol = tr->tro_volume; 665 if (bp->bio_cflags & G_RAID_BIO_FLAG_SYNC) { 666 /* 667 * This operation is part of a rebuild or resync operation. 668 * See what work just got done, then schedule the next bit of 669 * work, if any. Rebuild/resync is done a little bit at a 670 * time. Either when a timeout happens, or after we get a 671 * bunch of I/Os to the disk (to make sure an active system 672 * will complete in a sane amount of time). 673 * 674 * We are setup to do differing amounts of work for each of 675 * these cases. so long as the slabs is smallish (less than 676 * 50 or so, I'd guess, but that's just a WAG), we shouldn't 677 * have any bio starvation issues. For active disks, we do 678 * 5MB of data, for inactive ones, we do 50MB. 679 */ 680 if (trs->trso_type == TR_RAID1_REBUILD) { 681 if (bp->bio_cmd == BIO_READ) { 682 683 /* Immediately abort rebuild, if requested. */ 684 if (trs->trso_flags & TR_RAID1_F_ABORT) { 685 trs->trso_flags &= ~TR_RAID1_F_DOING_SOME; 686 g_raid_tr_raid1_rebuild_abort(tr); 687 return; 688 } 689 690 /* On read error, skip and cross fingers. */ 691 if (bp->bio_error != 0) { 692 G_RAID_LOGREQ(0, bp, 693 "Read error during rebuild (%d), " 694 "possible data loss!", 695 bp->bio_error); 696 goto rebuild_round_done; 697 } 698 699 /* 700 * The read operation finished, queue the 701 * write and get out. 702 */ 703 G_RAID_LOGREQ(4, bp, "rebuild read done. %d", 704 bp->bio_error); 705 bp->bio_cmd = BIO_WRITE; 706 bp->bio_cflags = G_RAID_BIO_FLAG_SYNC; 707 G_RAID_LOGREQ(4, bp, "Queueing rebuild write."); 708 g_raid_subdisk_iostart(trs->trso_failed_sd, bp); 709 } else { 710 /* 711 * The write operation just finished. Do 712 * another. We keep cloning the master bio 713 * since it has the right buffers allocated to 714 * it. 715 */ 716 G_RAID_LOGREQ(4, bp, 717 "rebuild write done. Error %d", 718 bp->bio_error); 719 nsd = trs->trso_failed_sd; 720 if (bp->bio_error != 0 || 721 trs->trso_flags & TR_RAID1_F_ABORT) { 722 if ((trs->trso_flags & 723 TR_RAID1_F_ABORT) == 0) { 724 g_raid_tr_raid1_fail_disk(sd->sd_softc, 725 nsd, nsd->sd_disk); 726 } 727 trs->trso_flags &= ~TR_RAID1_F_DOING_SOME; 728 g_raid_tr_raid1_rebuild_abort(tr); 729 return; 730 } 731 rebuild_round_done: 732 nsd = trs->trso_failed_sd; 733 trs->trso_flags &= ~TR_RAID1_F_LOCKED; 734 g_raid_unlock_range(sd->sd_volume, 735 bp->bio_offset, bp->bio_length); 736 nsd->sd_rebuild_pos += bp->bio_length; 737 if (nsd->sd_rebuild_pos >= nsd->sd_size) { 738 g_raid_tr_raid1_rebuild_finish(tr); 739 return; 740 } 741 742 /* Abort rebuild if we are stopping */ 743 if (trs->trso_stopping) { 744 trs->trso_flags &= ~TR_RAID1_F_DOING_SOME; 745 g_raid_tr_raid1_rebuild_abort(tr); 746 return; 747 } 748 749 if (--trs->trso_meta_update <= 0) { 750 g_raid_write_metadata(vol->v_softc, 751 vol, nsd, nsd->sd_disk); 752 trs->trso_meta_update = 753 g_raid1_rebuild_meta_update; 754 } 755 trs->trso_flags &= ~TR_RAID1_F_DOING_SOME; 756 if (--trs->trso_recover_slabs <= 0) 757 return; 758 g_raid_tr_raid1_rebuild_some(tr); 759 } 760 } else if (trs->trso_type == TR_RAID1_RESYNC) { 761 /* 762 * read good sd, read bad sd in parallel. when both 763 * done, compare the buffers. write good to the bad 764 * if different. do the next bit of work. 765 */ 766 panic("Somehow, we think we're doing a resync"); 767 } 768 return; 769 } 770 pbp = bp->bio_parent; 771 pbp->bio_inbed++; 772 if (bp->bio_cmd == BIO_READ && bp->bio_error != 0) { 773 /* 774 * Read failed on first drive. Retry the read error on 775 * another disk drive, if available, before erroring out the 776 * read. 777 */ 778 sd->sd_disk->d_read_errs++; 779 G_RAID_LOGREQ(0, bp, 780 "Read error (%d), %d read errors total", 781 bp->bio_error, sd->sd_disk->d_read_errs); 782 783 /* 784 * If there are too many read errors, we move to degraded. 785 * XXX Do we want to FAIL the drive (eg, make the user redo 786 * everything to get it back in sync), or just degrade the 787 * drive, which kicks off a resync? 788 */ 789 do_write = 1; 790 if (sd->sd_disk->d_read_errs > g_raid_read_err_thresh) { 791 g_raid_tr_raid1_fail_disk(sd->sd_softc, sd, sd->sd_disk); 792 if (pbp->bio_children == 1) 793 do_write = 0; 794 } 795 796 /* 797 * Find the other disk, and try to do the I/O to it. 798 */ 799 mask = (uintptr_t *)(&pbp->bio_driver2); 800 if (pbp->bio_children == 1) { 801 /* Save original subdisk. */ 802 pbp->bio_driver1 = do_write ? sd : NULL; 803 *mask = 0; 804 } 805 *mask |= 1 << sd->sd_pos; 806 nsd = g_raid_tr_raid1_select_read_disk(vol, pbp, *mask); 807 if (nsd != NULL && (cbp = g_clone_bio(pbp)) != NULL) { 808 g_destroy_bio(bp); 809 G_RAID_LOGREQ(2, cbp, "Retrying read from %d", 810 nsd->sd_pos); 811 if (pbp->bio_children == 2 && do_write) { 812 sd->sd_recovery++; 813 cbp->bio_caller1 = nsd; 814 pbp->bio_pflags = G_RAID_BIO_FLAG_LOCKED; 815 /* Lock callback starts I/O */ 816 g_raid_lock_range(sd->sd_volume, 817 cbp->bio_offset, cbp->bio_length, pbp, cbp); 818 } else { 819 g_raid_subdisk_iostart(nsd, cbp); 820 } 821 return; 822 } 823 /* 824 * We can't retry. Return the original error by falling 825 * through. This will happen when there's only one good disk. 826 * We don't need to fail the raid, since its actual state is 827 * based on the state of the subdisks. 828 */ 829 G_RAID_LOGREQ(2, bp, "Couldn't retry read, failing it"); 830 } 831 if (bp->bio_cmd == BIO_READ && 832 bp->bio_error == 0 && 833 pbp->bio_children > 1 && 834 pbp->bio_driver1 != NULL) { 835 /* 836 * If it was a read, and bio_children is >1, then we just 837 * recovered the data from the second drive. We should try to 838 * write that data to the first drive if sector remapping is 839 * enabled. A write should put the data in a new place on the 840 * disk, remapping the bad sector. Do we need to do that by 841 * queueing a request to the main worker thread? It doesn't 842 * affect the return code of this current read, and can be 843 * done at our leisure. However, to make the code simpler, it 844 * is done synchronously. 845 */ 846 G_RAID_LOGREQ(3, bp, "Recovered data from other drive"); 847 cbp = g_clone_bio(pbp); 848 if (cbp != NULL) { 849 g_destroy_bio(bp); 850 cbp->bio_cmd = BIO_WRITE; 851 cbp->bio_cflags = G_RAID_BIO_FLAG_REMAP; 852 G_RAID_LOGREQ(2, cbp, 853 "Attempting bad sector remap on failing drive."); 854 g_raid_subdisk_iostart(pbp->bio_driver1, cbp); 855 return; 856 } 857 } 858 if (pbp->bio_pflags & G_RAID_BIO_FLAG_LOCKED) { 859 /* 860 * We're done with a recovery, mark the range as unlocked. 861 * For any write errors, we aggressively fail the disk since 862 * there was both a READ and a WRITE error at this location. 863 * Both types of errors generally indicates the drive is on 864 * the verge of total failure anyway. Better to stop trusting 865 * it now. However, we need to reset error to 0 in that case 866 * because we're not failing the original I/O which succeeded. 867 */ 868 if (bp->bio_cmd == BIO_WRITE && bp->bio_error) { 869 G_RAID_LOGREQ(0, bp, "Remap write failed: " 870 "failing subdisk."); 871 g_raid_tr_raid1_fail_disk(sd->sd_softc, sd, sd->sd_disk); 872 bp->bio_error = 0; 873 } 874 if (pbp->bio_driver1 != NULL) { 875 ((struct g_raid_subdisk *)pbp->bio_driver1) 876 ->sd_recovery--; 877 } 878 G_RAID_LOGREQ(2, bp, "REMAP done %d.", bp->bio_error); 879 g_raid_unlock_range(sd->sd_volume, bp->bio_offset, 880 bp->bio_length); 881 } 882 if (pbp->bio_cmd != BIO_READ) { 883 if (pbp->bio_inbed == 1 || pbp->bio_error != 0) 884 pbp->bio_error = bp->bio_error; 885 if (pbp->bio_cmd == BIO_WRITE && bp->bio_error != 0) { 886 G_RAID_LOGREQ(0, bp, "Write failed: failing subdisk."); 887 g_raid_tr_raid1_fail_disk(sd->sd_softc, sd, sd->sd_disk); 888 } 889 error = pbp->bio_error; 890 } else 891 error = bp->bio_error; 892 g_destroy_bio(bp); 893 if (pbp->bio_children == pbp->bio_inbed) { 894 pbp->bio_completed = pbp->bio_length; 895 g_raid_iodone(pbp, error); 896 } 897 } 898 899 static int 900 g_raid_tr_kerneldump_raid1(struct g_raid_tr_object *tr, 901 void *virtual, vm_offset_t physical, off_t offset, size_t length) 902 { 903 struct g_raid_volume *vol; 904 struct g_raid_subdisk *sd; 905 int error, i, ok; 906 907 vol = tr->tro_volume; 908 error = 0; 909 ok = 0; 910 for (i = 0; i < vol->v_disks_count; i++) { 911 sd = &vol->v_subdisks[i]; 912 switch (sd->sd_state) { 913 case G_RAID_SUBDISK_S_ACTIVE: 914 break; 915 case G_RAID_SUBDISK_S_REBUILD: 916 /* 917 * When rebuilding, only part of this subdisk is 918 * writable, the rest will be written as part of the 919 * that process. 920 */ 921 if (offset >= sd->sd_rebuild_pos) 922 continue; 923 break; 924 case G_RAID_SUBDISK_S_STALE: 925 case G_RAID_SUBDISK_S_RESYNC: 926 /* 927 * Resyncing still writes on the theory that the 928 * resync'd disk is very close and writing it will 929 * keep it that way better if we keep up while 930 * resyncing. 931 */ 932 break; 933 default: 934 continue; 935 } 936 error = g_raid_subdisk_kerneldump(sd, 937 virtual, physical, offset, length); 938 if (error == 0) 939 ok++; 940 } 941 return (ok > 0 ? 0 : error); 942 } 943 944 static int 945 g_raid_tr_locked_raid1(struct g_raid_tr_object *tr, void *argp) 946 { 947 struct bio *bp; 948 struct g_raid_subdisk *sd; 949 950 bp = (struct bio *)argp; 951 sd = (struct g_raid_subdisk *)bp->bio_caller1; 952 g_raid_subdisk_iostart(sd, bp); 953 954 return (0); 955 } 956 957 static int 958 g_raid_tr_idle_raid1(struct g_raid_tr_object *tr) 959 { 960 struct g_raid_tr_raid1_object *trs; 961 962 trs = (struct g_raid_tr_raid1_object *)tr; 963 trs->trso_fair_io = g_raid1_rebuild_fair_io; 964 trs->trso_recover_slabs = g_raid1_rebuild_cluster_idle; 965 if (trs->trso_type == TR_RAID1_REBUILD) 966 g_raid_tr_raid1_rebuild_some(tr); 967 return (0); 968 } 969 970 static int 971 g_raid_tr_free_raid1(struct g_raid_tr_object *tr) 972 { 973 struct g_raid_tr_raid1_object *trs; 974 975 trs = (struct g_raid_tr_raid1_object *)tr; 976 977 if (trs->trso_buffer != NULL) { 978 free(trs->trso_buffer, M_TR_RAID1); 979 trs->trso_buffer = NULL; 980 } 981 return (0); 982 } 983 984 G_RAID_TR_DECLARE(raid1, "RAID1");
Cache object: 2907e981991cce507018d7696d219884
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]