Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/geom/raid/tr_raid1.c
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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: releng/8.3/sys/geom/raid/tr_raid1.c 223177 2011-06-17 06:59:49Z mav $"); 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); 46 SYSCTL_NODE(_kern_geom_raid, OID_AUTO, raid1, CTLFLAG_RW, 0, 47 "RAID1 parameters"); 48 49 #define RAID1_REBUILD_SLAB (1 << 20) /* One transation in a rebuild */ 50 static int g_raid1_rebuild_slab = RAID1_REBUILD_SLAB; 51 TUNABLE_INT("kern.geom.raid.raid1.rebuild_slab_size", 52 &g_raid1_rebuild_slab); 53 SYSCTL_UINT(_kern_geom_raid_raid1, OID_AUTO, rebuild_slab_size, CTLFLAG_RW, 54 &g_raid1_rebuild_slab, 0, 55 "Amount of the disk to rebuild each read/write cycle of the rebuild."); 56 57 #define RAID1_REBUILD_FAIR_IO 20 /* use 1/x of the available I/O */ 58 static int g_raid1_rebuild_fair_io = RAID1_REBUILD_FAIR_IO; 59 TUNABLE_INT("kern.geom.raid.raid1.rebuild_fair_io", 60 &g_raid1_rebuild_fair_io); 61 SYSCTL_UINT(_kern_geom_raid_raid1, OID_AUTO, rebuild_fair_io, CTLFLAG_RW, 62 &g_raid1_rebuild_fair_io, 0, 63 "Fraction of the I/O bandwidth to use when disk busy for rebuild."); 64 65 #define RAID1_REBUILD_CLUSTER_IDLE 100 66 static int g_raid1_rebuild_cluster_idle = RAID1_REBUILD_CLUSTER_IDLE; 67 TUNABLE_INT("kern.geom.raid.raid1.rebuild_cluster_idle", 68 &g_raid1_rebuild_cluster_idle); 69 SYSCTL_UINT(_kern_geom_raid_raid1, OID_AUTO, rebuild_cluster_idle, CTLFLAG_RW, 70 &g_raid1_rebuild_cluster_idle, 0, 71 "Number of slabs to do each time we trigger a rebuild cycle"); 72 73 #define RAID1_REBUILD_META_UPDATE 1024 /* update meta data every 1GB or so */ 74 static int g_raid1_rebuild_meta_update = RAID1_REBUILD_META_UPDATE; 75 TUNABLE_INT("kern.geom.raid.raid1.rebuild_meta_update", 76 &g_raid1_rebuild_meta_update); 77 SYSCTL_UINT(_kern_geom_raid_raid1, OID_AUTO, rebuild_meta_update, CTLFLAG_RW, 78 &g_raid1_rebuild_meta_update, 0, 79 "When to update the meta data."); 80 81 static MALLOC_DEFINE(M_TR_RAID1, "tr_raid1_data", "GEOM_RAID RAID1 data"); 82 83 #define TR_RAID1_NONE 0 84 #define TR_RAID1_REBUILD 1 85 #define TR_RAID1_RESYNC 2 86 87 #define TR_RAID1_F_DOING_SOME 0x1 88 #define TR_RAID1_F_LOCKED 0x2 89 #define TR_RAID1_F_ABORT 0x4 90 91 struct g_raid_tr_raid1_object { 92 struct g_raid_tr_object trso_base; 93 int trso_starting; 94 int trso_stopping; 95 int trso_type; 96 int trso_recover_slabs; /* slabs before rest */ 97 int trso_fair_io; 98 int trso_meta_update; 99 int trso_flags; 100 struct g_raid_subdisk *trso_failed_sd; /* like per volume */ 101 void *trso_buffer; /* Buffer space */ 102 struct bio trso_bio; 103 }; 104 105 static g_raid_tr_taste_t g_raid_tr_taste_raid1; 106 static g_raid_tr_event_t g_raid_tr_event_raid1; 107 static g_raid_tr_start_t g_raid_tr_start_raid1; 108 static g_raid_tr_stop_t g_raid_tr_stop_raid1; 109 static g_raid_tr_iostart_t g_raid_tr_iostart_raid1; 110 static g_raid_tr_iodone_t g_raid_tr_iodone_raid1; 111 static g_raid_tr_kerneldump_t g_raid_tr_kerneldump_raid1; 112 static g_raid_tr_locked_t g_raid_tr_locked_raid1; 113 static g_raid_tr_idle_t g_raid_tr_idle_raid1; 114 static g_raid_tr_free_t g_raid_tr_free_raid1; 115 116 static kobj_method_t g_raid_tr_raid1_methods[] = { 117 KOBJMETHOD(g_raid_tr_taste, g_raid_tr_taste_raid1), 118 KOBJMETHOD(g_raid_tr_event, g_raid_tr_event_raid1), 119 KOBJMETHOD(g_raid_tr_start, g_raid_tr_start_raid1), 120 KOBJMETHOD(g_raid_tr_stop, g_raid_tr_stop_raid1), 121 KOBJMETHOD(g_raid_tr_iostart, g_raid_tr_iostart_raid1), 122 KOBJMETHOD(g_raid_tr_iodone, g_raid_tr_iodone_raid1), 123 KOBJMETHOD(g_raid_tr_kerneldump, g_raid_tr_kerneldump_raid1), 124 KOBJMETHOD(g_raid_tr_locked, g_raid_tr_locked_raid1), 125 KOBJMETHOD(g_raid_tr_idle, g_raid_tr_idle_raid1), 126 KOBJMETHOD(g_raid_tr_free, g_raid_tr_free_raid1), 127 { 0, 0 } 128 }; 129 130 static struct g_raid_tr_class g_raid_tr_raid1_class = { 131 "RAID1", 132 g_raid_tr_raid1_methods, 133 sizeof(struct g_raid_tr_raid1_object), 134 .trc_priority = 100 135 }; 136 137 static void g_raid_tr_raid1_rebuild_abort(struct g_raid_tr_object *tr); 138 static void g_raid_tr_raid1_maybe_rebuild(struct g_raid_tr_object *tr, 139 struct g_raid_subdisk *sd); 140 141 static int 142 g_raid_tr_taste_raid1(struct g_raid_tr_object *tr, struct g_raid_volume *vol) 143 { 144 struct g_raid_tr_raid1_object *trs; 145 146 trs = (struct g_raid_tr_raid1_object *)tr; 147 if (tr->tro_volume->v_raid_level != G_RAID_VOLUME_RL_RAID1 || 148 tr->tro_volume->v_raid_level_qualifier != G_RAID_VOLUME_RLQ_NONE) 149 return (G_RAID_TR_TASTE_FAIL); 150 trs->trso_starting = 1; 151 return (G_RAID_TR_TASTE_SUCCEED); 152 } 153 154 static int 155 g_raid_tr_update_state_raid1(struct g_raid_volume *vol, 156 struct g_raid_subdisk *sd) 157 { 158 struct g_raid_tr_raid1_object *trs; 159 struct g_raid_softc *sc; 160 struct g_raid_subdisk *tsd, *bestsd; 161 u_int s; 162 int i, na, ns; 163 164 sc = vol->v_softc; 165 trs = (struct g_raid_tr_raid1_object *)vol->v_tr; 166 if (trs->trso_stopping && 167 (trs->trso_flags & TR_RAID1_F_DOING_SOME) == 0) 168 s = G_RAID_VOLUME_S_STOPPED; 169 else if (trs->trso_starting) 170 s = G_RAID_VOLUME_S_STARTING; 171 else { 172 /* Make sure we have at least one ACTIVE disk. */ 173 na = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_ACTIVE); 174 if (na == 0) { 175 /* 176 * Critical situation! We have no any active disk! 177 * Choose the best disk we have to make it active. 178 */ 179 bestsd = &vol->v_subdisks[0]; 180 for (i = 1; i < vol->v_disks_count; i++) { 181 tsd = &vol->v_subdisks[i]; 182 if (tsd->sd_state > bestsd->sd_state) 183 bestsd = tsd; 184 else if (tsd->sd_state == bestsd->sd_state && 185 (tsd->sd_state == G_RAID_SUBDISK_S_REBUILD || 186 tsd->sd_state == G_RAID_SUBDISK_S_RESYNC) && 187 tsd->sd_rebuild_pos > bestsd->sd_rebuild_pos) 188 bestsd = tsd; 189 } 190 if (bestsd->sd_state >= G_RAID_SUBDISK_S_UNINITIALIZED) { 191 /* We found reasonable candidate. */ 192 G_RAID_DEBUG1(1, sc, 193 "Promote subdisk %s:%d from %s to ACTIVE.", 194 vol->v_name, bestsd->sd_pos, 195 g_raid_subdisk_state2str(bestsd->sd_state)); 196 g_raid_change_subdisk_state(bestsd, 197 G_RAID_SUBDISK_S_ACTIVE); 198 g_raid_write_metadata(sc, 199 vol, bestsd, bestsd->sd_disk); 200 } 201 } 202 na = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_ACTIVE); 203 ns = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_STALE) + 204 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_RESYNC); 205 if (na == vol->v_disks_count) 206 s = G_RAID_VOLUME_S_OPTIMAL; 207 else if (na + ns == vol->v_disks_count) 208 s = G_RAID_VOLUME_S_SUBOPTIMAL; 209 else if (na > 0) 210 s = G_RAID_VOLUME_S_DEGRADED; 211 else 212 s = G_RAID_VOLUME_S_BROKEN; 213 g_raid_tr_raid1_maybe_rebuild(vol->v_tr, sd); 214 } 215 if (s != vol->v_state) { 216 g_raid_event_send(vol, G_RAID_VOLUME_S_ALIVE(s) ? 217 G_RAID_VOLUME_E_UP : G_RAID_VOLUME_E_DOWN, 218 G_RAID_EVENT_VOLUME); 219 g_raid_change_volume_state(vol, s); 220 if (!trs->trso_starting && !trs->trso_stopping) 221 g_raid_write_metadata(sc, vol, NULL, NULL); 222 } 223 return (0); 224 } 225 226 static void 227 g_raid_tr_raid1_fail_disk(struct g_raid_softc *sc, struct g_raid_subdisk *sd, 228 struct g_raid_disk *disk) 229 { 230 /* 231 * We don't fail the last disk in the pack, since it still has decent 232 * data on it and that's better than failing the disk if it is the root 233 * file system. 234 * 235 * XXX should this be controlled via a tunable? It makes sense for 236 * the volume that has / on it. I can't think of a case where we'd 237 * want the volume to go away on this kind of event. 238 */ 239 if (g_raid_nsubdisks(sd->sd_volume, G_RAID_SUBDISK_S_ACTIVE) == 1 && 240 g_raid_get_subdisk(sd->sd_volume, G_RAID_SUBDISK_S_ACTIVE) == sd) 241 return; 242 g_raid_fail_disk(sc, sd, disk); 243 } 244 245 static void 246 g_raid_tr_raid1_rebuild_some(struct g_raid_tr_object *tr) 247 { 248 struct g_raid_tr_raid1_object *trs; 249 struct g_raid_subdisk *sd, *good_sd; 250 struct bio *bp; 251 252 trs = (struct g_raid_tr_raid1_object *)tr; 253 if (trs->trso_flags & TR_RAID1_F_DOING_SOME) 254 return; 255 sd = trs->trso_failed_sd; 256 good_sd = g_raid_get_subdisk(sd->sd_volume, G_RAID_SUBDISK_S_ACTIVE); 257 if (good_sd == NULL) { 258 g_raid_tr_raid1_rebuild_abort(tr); 259 return; 260 } 261 bp = &trs->trso_bio; 262 memset(bp, 0, sizeof(*bp)); 263 bp->bio_offset = sd->sd_rebuild_pos; 264 bp->bio_length = MIN(g_raid1_rebuild_slab, 265 sd->sd_size - sd->sd_rebuild_pos); 266 bp->bio_data = trs->trso_buffer; 267 bp->bio_cmd = BIO_READ; 268 bp->bio_cflags = G_RAID_BIO_FLAG_SYNC; 269 bp->bio_caller1 = good_sd; 270 trs->trso_flags |= TR_RAID1_F_DOING_SOME; 271 trs->trso_flags |= TR_RAID1_F_LOCKED; 272 g_raid_lock_range(sd->sd_volume, /* Lock callback starts I/O */ 273 bp->bio_offset, bp->bio_length, NULL, bp); 274 } 275 276 static void 277 g_raid_tr_raid1_rebuild_done(struct g_raid_tr_raid1_object *trs) 278 { 279 struct g_raid_volume *vol; 280 struct g_raid_subdisk *sd; 281 282 vol = trs->trso_base.tro_volume; 283 sd = trs->trso_failed_sd; 284 g_raid_write_metadata(vol->v_softc, vol, sd, sd->sd_disk); 285 free(trs->trso_buffer, M_TR_RAID1); 286 trs->trso_buffer = NULL; 287 trs->trso_flags &= ~TR_RAID1_F_DOING_SOME; 288 trs->trso_type = TR_RAID1_NONE; 289 trs->trso_recover_slabs = 0; 290 trs->trso_failed_sd = NULL; 291 g_raid_tr_update_state_raid1(vol, NULL); 292 } 293 294 static void 295 g_raid_tr_raid1_rebuild_finish(struct g_raid_tr_object *tr) 296 { 297 struct g_raid_tr_raid1_object *trs; 298 struct g_raid_subdisk *sd; 299 300 trs = (struct g_raid_tr_raid1_object *)tr; 301 sd = trs->trso_failed_sd; 302 G_RAID_DEBUG1(0, tr->tro_volume->v_softc, 303 "Subdisk %s:%d-%s rebuild completed.", 304 sd->sd_volume->v_name, sd->sd_pos, 305 sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]"); 306 g_raid_change_subdisk_state(sd, G_RAID_SUBDISK_S_ACTIVE); 307 sd->sd_rebuild_pos = 0; 308 g_raid_tr_raid1_rebuild_done(trs); 309 } 310 311 static void 312 g_raid_tr_raid1_rebuild_abort(struct g_raid_tr_object *tr) 313 { 314 struct g_raid_tr_raid1_object *trs; 315 struct g_raid_subdisk *sd; 316 struct g_raid_volume *vol; 317 off_t len; 318 319 vol = tr->tro_volume; 320 trs = (struct g_raid_tr_raid1_object *)tr; 321 sd = trs->trso_failed_sd; 322 if (trs->trso_flags & TR_RAID1_F_DOING_SOME) { 323 G_RAID_DEBUG1(1, vol->v_softc, 324 "Subdisk %s:%d-%s rebuild is aborting.", 325 sd->sd_volume->v_name, sd->sd_pos, 326 sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]"); 327 trs->trso_flags |= TR_RAID1_F_ABORT; 328 } else { 329 G_RAID_DEBUG1(0, vol->v_softc, 330 "Subdisk %s:%d-%s rebuild aborted.", 331 sd->sd_volume->v_name, sd->sd_pos, 332 sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]"); 333 trs->trso_flags &= ~TR_RAID1_F_ABORT; 334 if (trs->trso_flags & TR_RAID1_F_LOCKED) { 335 trs->trso_flags &= ~TR_RAID1_F_LOCKED; 336 len = MIN(g_raid1_rebuild_slab, 337 sd->sd_size - sd->sd_rebuild_pos); 338 g_raid_unlock_range(tr->tro_volume, 339 sd->sd_rebuild_pos, len); 340 } 341 g_raid_tr_raid1_rebuild_done(trs); 342 } 343 } 344 345 static void 346 g_raid_tr_raid1_rebuild_start(struct g_raid_tr_object *tr) 347 { 348 struct g_raid_volume *vol; 349 struct g_raid_tr_raid1_object *trs; 350 struct g_raid_subdisk *sd, *fsd; 351 352 vol = tr->tro_volume; 353 trs = (struct g_raid_tr_raid1_object *)tr; 354 if (trs->trso_failed_sd) { 355 G_RAID_DEBUG1(1, vol->v_softc, 356 "Already rebuild in start rebuild. pos %jd\n", 357 (intmax_t)trs->trso_failed_sd->sd_rebuild_pos); 358 return; 359 } 360 sd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_ACTIVE); 361 if (sd == NULL) { 362 G_RAID_DEBUG1(1, vol->v_softc, 363 "No active disk to rebuild. night night."); 364 return; 365 } 366 fsd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_RESYNC); 367 if (fsd == NULL) 368 fsd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_REBUILD); 369 if (fsd == NULL) { 370 fsd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_STALE); 371 if (fsd != NULL) { 372 fsd->sd_rebuild_pos = 0; 373 g_raid_change_subdisk_state(fsd, 374 G_RAID_SUBDISK_S_RESYNC); 375 g_raid_write_metadata(vol->v_softc, vol, fsd, NULL); 376 } else { 377 fsd = g_raid_get_subdisk(vol, 378 G_RAID_SUBDISK_S_UNINITIALIZED); 379 if (fsd == NULL) 380 fsd = g_raid_get_subdisk(vol, 381 G_RAID_SUBDISK_S_NEW); 382 if (fsd != NULL) { 383 fsd->sd_rebuild_pos = 0; 384 g_raid_change_subdisk_state(fsd, 385 G_RAID_SUBDISK_S_REBUILD); 386 g_raid_write_metadata(vol->v_softc, 387 vol, fsd, NULL); 388 } 389 } 390 } 391 if (fsd == NULL) { 392 G_RAID_DEBUG1(1, vol->v_softc, 393 "No failed disk to rebuild. night night."); 394 return; 395 } 396 trs->trso_failed_sd = fsd; 397 G_RAID_DEBUG1(0, vol->v_softc, 398 "Subdisk %s:%d-%s rebuild start at %jd.", 399 fsd->sd_volume->v_name, fsd->sd_pos, 400 fsd->sd_disk ? g_raid_get_diskname(fsd->sd_disk) : "[none]", 401 trs->trso_failed_sd->sd_rebuild_pos); 402 trs->trso_type = TR_RAID1_REBUILD; 403 trs->trso_buffer = malloc(g_raid1_rebuild_slab, M_TR_RAID1, M_WAITOK); 404 trs->trso_meta_update = g_raid1_rebuild_meta_update; 405 g_raid_tr_raid1_rebuild_some(tr); 406 } 407 408 409 static void 410 g_raid_tr_raid1_maybe_rebuild(struct g_raid_tr_object *tr, 411 struct g_raid_subdisk *sd) 412 { 413 struct g_raid_volume *vol; 414 struct g_raid_tr_raid1_object *trs; 415 int na, nr; 416 417 /* 418 * If we're stopping, don't do anything. If we don't have at least one 419 * good disk and one bad disk, we don't do anything. And if there's a 420 * 'good disk' stored in the trs, then we're in progress and we punt. 421 * If we make it past all these checks, we need to rebuild. 422 */ 423 vol = tr->tro_volume; 424 trs = (struct g_raid_tr_raid1_object *)tr; 425 if (trs->trso_stopping) 426 return; 427 na = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_ACTIVE); 428 nr = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_REBUILD) + 429 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_RESYNC); 430 switch(trs->trso_type) { 431 case TR_RAID1_NONE: 432 if (na == 0) 433 return; 434 if (nr == 0) { 435 nr = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_NEW) + 436 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_STALE) + 437 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_UNINITIALIZED); 438 if (nr == 0) 439 return; 440 } 441 g_raid_tr_raid1_rebuild_start(tr); 442 break; 443 case TR_RAID1_REBUILD: 444 if (na == 0 || nr == 0 || trs->trso_failed_sd == sd) 445 g_raid_tr_raid1_rebuild_abort(tr); 446 break; 447 case TR_RAID1_RESYNC: 448 break; 449 } 450 } 451 452 static int 453 g_raid_tr_event_raid1(struct g_raid_tr_object *tr, 454 struct g_raid_subdisk *sd, u_int event) 455 { 456 457 g_raid_tr_update_state_raid1(tr->tro_volume, sd); 458 return (0); 459 } 460 461 static int 462 g_raid_tr_start_raid1(struct g_raid_tr_object *tr) 463 { 464 struct g_raid_tr_raid1_object *trs; 465 struct g_raid_volume *vol; 466 467 trs = (struct g_raid_tr_raid1_object *)tr; 468 vol = tr->tro_volume; 469 trs->trso_starting = 0; 470 g_raid_tr_update_state_raid1(vol, NULL); 471 return (0); 472 } 473 474 static int 475 g_raid_tr_stop_raid1(struct g_raid_tr_object *tr) 476 { 477 struct g_raid_tr_raid1_object *trs; 478 struct g_raid_volume *vol; 479 480 trs = (struct g_raid_tr_raid1_object *)tr; 481 vol = tr->tro_volume; 482 trs->trso_starting = 0; 483 trs->trso_stopping = 1; 484 g_raid_tr_update_state_raid1(vol, NULL); 485 return (0); 486 } 487 488 /* 489 * Select the disk to read from. Take into account: subdisk state, running 490 * error recovery, average disk load, head position and possible cache hits. 491 */ 492 #define ABS(x) (((x) >= 0) ? (x) : (-(x))) 493 static struct g_raid_subdisk * 494 g_raid_tr_raid1_select_read_disk(struct g_raid_volume *vol, struct bio *bp, 495 u_int mask) 496 { 497 struct g_raid_subdisk *sd, *best; 498 int i, prio, bestprio; 499 500 best = NULL; 501 bestprio = INT_MAX; 502 for (i = 0; i < vol->v_disks_count; i++) { 503 sd = &vol->v_subdisks[i]; 504 if (sd->sd_state != G_RAID_SUBDISK_S_ACTIVE && 505 ((sd->sd_state != G_RAID_SUBDISK_S_REBUILD && 506 sd->sd_state != G_RAID_SUBDISK_S_RESYNC) || 507 bp->bio_offset + bp->bio_length > sd->sd_rebuild_pos)) 508 continue; 509 if ((mask & (1 << i)) != 0) 510 continue; 511 prio = G_RAID_SUBDISK_LOAD(sd); 512 prio += min(sd->sd_recovery, 255) << 22; 513 prio += (G_RAID_SUBDISK_S_ACTIVE - sd->sd_state) << 16; 514 /* If disk head is precisely in position - highly prefer it. */ 515 if (G_RAID_SUBDISK_POS(sd) == bp->bio_offset) 516 prio -= 2 * G_RAID_SUBDISK_LOAD_SCALE; 517 else 518 /* If disk head is close to position - prefer it. */ 519 if (ABS(G_RAID_SUBDISK_POS(sd) - bp->bio_offset) < 520 G_RAID_SUBDISK_TRACK_SIZE) 521 prio -= 1 * G_RAID_SUBDISK_LOAD_SCALE; 522 if (prio < bestprio) { 523 best = sd; 524 bestprio = prio; 525 } 526 } 527 return (best); 528 } 529 530 static void 531 g_raid_tr_iostart_raid1_read(struct g_raid_tr_object *tr, struct bio *bp) 532 { 533 struct g_raid_subdisk *sd; 534 struct bio *cbp; 535 536 sd = g_raid_tr_raid1_select_read_disk(tr->tro_volume, bp, 0); 537 KASSERT(sd != NULL, ("No active disks in volume %s.", 538 tr->tro_volume->v_name)); 539 540 cbp = g_clone_bio(bp); 541 if (cbp == NULL) { 542 g_raid_iodone(bp, ENOMEM); 543 return; 544 } 545 546 g_raid_subdisk_iostart(sd, cbp); 547 } 548 549 static void 550 g_raid_tr_iostart_raid1_write(struct g_raid_tr_object *tr, struct bio *bp) 551 { 552 struct g_raid_volume *vol; 553 struct g_raid_subdisk *sd; 554 struct bio_queue_head queue; 555 struct bio *cbp; 556 int i; 557 558 vol = tr->tro_volume; 559 560 /* 561 * Allocate all bios before sending any request, so we can return 562 * ENOMEM in nice and clean way. 563 */ 564 bioq_init(&queue); 565 for (i = 0; i < vol->v_disks_count; i++) { 566 sd = &vol->v_subdisks[i]; 567 switch (sd->sd_state) { 568 case G_RAID_SUBDISK_S_ACTIVE: 569 break; 570 case G_RAID_SUBDISK_S_REBUILD: 571 /* 572 * When rebuilding, only part of this subdisk is 573 * writable, the rest will be written as part of the 574 * that process. 575 */ 576 if (bp->bio_offset >= sd->sd_rebuild_pos) 577 continue; 578 break; 579 case G_RAID_SUBDISK_S_STALE: 580 case G_RAID_SUBDISK_S_RESYNC: 581 /* 582 * Resyncing still writes on the theory that the 583 * resync'd disk is very close and writing it will 584 * keep it that way better if we keep up while 585 * resyncing. 586 */ 587 break; 588 default: 589 continue; 590 } 591 cbp = g_clone_bio(bp); 592 if (cbp == NULL) 593 goto failure; 594 cbp->bio_caller1 = sd; 595 bioq_insert_tail(&queue, cbp); 596 } 597 for (cbp = bioq_first(&queue); cbp != NULL; 598 cbp = bioq_first(&queue)) { 599 bioq_remove(&queue, cbp); 600 sd = cbp->bio_caller1; 601 cbp->bio_caller1 = NULL; 602 g_raid_subdisk_iostart(sd, cbp); 603 } 604 return; 605 failure: 606 for (cbp = bioq_first(&queue); cbp != NULL; 607 cbp = bioq_first(&queue)) { 608 bioq_remove(&queue, cbp); 609 g_destroy_bio(cbp); 610 } 611 if (bp->bio_error == 0) 612 bp->bio_error = ENOMEM; 613 g_raid_iodone(bp, bp->bio_error); 614 } 615 616 static void 617 g_raid_tr_iostart_raid1(struct g_raid_tr_object *tr, struct bio *bp) 618 { 619 struct g_raid_volume *vol; 620 struct g_raid_tr_raid1_object *trs; 621 622 vol = tr->tro_volume; 623 trs = (struct g_raid_tr_raid1_object *)tr; 624 if (vol->v_state != G_RAID_VOLUME_S_OPTIMAL && 625 vol->v_state != G_RAID_VOLUME_S_SUBOPTIMAL && 626 vol->v_state != G_RAID_VOLUME_S_DEGRADED) { 627 g_raid_iodone(bp, EIO); 628 return; 629 } 630 /* 631 * If we're rebuilding, squeeze in rebuild activity every so often, 632 * even when the disk is busy. Be sure to only count real I/O 633 * to the disk. All 'SPECIAL' I/O is traffic generated to the disk 634 * by this module. 635 */ 636 if (trs->trso_failed_sd != NULL && 637 !(bp->bio_cflags & G_RAID_BIO_FLAG_SPECIAL)) { 638 /* Make this new or running now round short. */ 639 trs->trso_recover_slabs = 0; 640 if (--trs->trso_fair_io <= 0) { 641 trs->trso_fair_io = g_raid1_rebuild_fair_io; 642 g_raid_tr_raid1_rebuild_some(tr); 643 } 644 } 645 switch (bp->bio_cmd) { 646 case BIO_READ: 647 g_raid_tr_iostart_raid1_read(tr, bp); 648 break; 649 case BIO_WRITE: 650 g_raid_tr_iostart_raid1_write(tr, bp); 651 break; 652 case BIO_DELETE: 653 g_raid_iodone(bp, EIO); 654 break; 655 case BIO_FLUSH: 656 g_raid_tr_flush_common(tr, bp); 657 break; 658 default: 659 KASSERT(1 == 0, ("Invalid command here: %u (volume=%s)", 660 bp->bio_cmd, vol->v_name)); 661 break; 662 } 663 } 664 665 static void 666 g_raid_tr_iodone_raid1(struct g_raid_tr_object *tr, 667 struct g_raid_subdisk *sd, struct bio *bp) 668 { 669 struct bio *cbp; 670 struct g_raid_subdisk *nsd; 671 struct g_raid_volume *vol; 672 struct bio *pbp; 673 struct g_raid_tr_raid1_object *trs; 674 uintptr_t *mask; 675 int error, do_write; 676 677 trs = (struct g_raid_tr_raid1_object *)tr; 678 vol = tr->tro_volume; 679 if (bp->bio_cflags & G_RAID_BIO_FLAG_SYNC) { 680 /* 681 * This operation is part of a rebuild or resync operation. 682 * See what work just got done, then schedule the next bit of 683 * work, if any. Rebuild/resync is done a little bit at a 684 * time. Either when a timeout happens, or after we get a 685 * bunch of I/Os to the disk (to make sure an active system 686 * will complete in a sane amount of time). 687 * 688 * We are setup to do differing amounts of work for each of 689 * these cases. so long as the slabs is smallish (less than 690 * 50 or so, I'd guess, but that's just a WAG), we shouldn't 691 * have any bio starvation issues. For active disks, we do 692 * 5MB of data, for inactive ones, we do 50MB. 693 */ 694 if (trs->trso_type == TR_RAID1_REBUILD) { 695 if (bp->bio_cmd == BIO_READ) { 696 697 /* Immediately abort rebuild, if requested. */ 698 if (trs->trso_flags & TR_RAID1_F_ABORT) { 699 trs->trso_flags &= ~TR_RAID1_F_DOING_SOME; 700 g_raid_tr_raid1_rebuild_abort(tr); 701 return; 702 } 703 704 /* On read error, skip and cross fingers. */ 705 if (bp->bio_error != 0) { 706 G_RAID_LOGREQ(0, bp, 707 "Read error during rebuild (%d), " 708 "possible data loss!", 709 bp->bio_error); 710 goto rebuild_round_done; 711 } 712 713 /* 714 * The read operation finished, queue the 715 * write and get out. 716 */ 717 G_RAID_LOGREQ(4, bp, "rebuild read done. %d", 718 bp->bio_error); 719 bp->bio_cmd = BIO_WRITE; 720 bp->bio_cflags = G_RAID_BIO_FLAG_SYNC; 721 G_RAID_LOGREQ(4, bp, "Queueing rebuild write."); 722 g_raid_subdisk_iostart(trs->trso_failed_sd, bp); 723 } else { 724 /* 725 * The write operation just finished. Do 726 * another. We keep cloning the master bio 727 * since it has the right buffers allocated to 728 * it. 729 */ 730 G_RAID_LOGREQ(4, bp, 731 "rebuild write done. Error %d", 732 bp->bio_error); 733 nsd = trs->trso_failed_sd; 734 if (bp->bio_error != 0 || 735 trs->trso_flags & TR_RAID1_F_ABORT) { 736 if ((trs->trso_flags & 737 TR_RAID1_F_ABORT) == 0) { 738 g_raid_tr_raid1_fail_disk(sd->sd_softc, 739 nsd, nsd->sd_disk); 740 } 741 trs->trso_flags &= ~TR_RAID1_F_DOING_SOME; 742 g_raid_tr_raid1_rebuild_abort(tr); 743 return; 744 } 745 rebuild_round_done: 746 nsd = trs->trso_failed_sd; 747 trs->trso_flags &= ~TR_RAID1_F_LOCKED; 748 g_raid_unlock_range(sd->sd_volume, 749 bp->bio_offset, bp->bio_length); 750 nsd->sd_rebuild_pos += bp->bio_length; 751 if (nsd->sd_rebuild_pos >= nsd->sd_size) { 752 g_raid_tr_raid1_rebuild_finish(tr); 753 return; 754 } 755 756 /* Abort rebuild if we are stopping */ 757 if (trs->trso_stopping) { 758 trs->trso_flags &= ~TR_RAID1_F_DOING_SOME; 759 g_raid_tr_raid1_rebuild_abort(tr); 760 return; 761 } 762 763 if (--trs->trso_meta_update <= 0) { 764 g_raid_write_metadata(vol->v_softc, 765 vol, nsd, nsd->sd_disk); 766 trs->trso_meta_update = 767 g_raid1_rebuild_meta_update; 768 } 769 trs->trso_flags &= ~TR_RAID1_F_DOING_SOME; 770 if (--trs->trso_recover_slabs <= 0) 771 return; 772 g_raid_tr_raid1_rebuild_some(tr); 773 } 774 } else if (trs->trso_type == TR_RAID1_RESYNC) { 775 /* 776 * read good sd, read bad sd in parallel. when both 777 * done, compare the buffers. write good to the bad 778 * if different. do the next bit of work. 779 */ 780 panic("Somehow, we think we're doing a resync"); 781 } 782 return; 783 } 784 pbp = bp->bio_parent; 785 pbp->bio_inbed++; 786 if (bp->bio_cmd == BIO_READ && bp->bio_error != 0) { 787 /* 788 * Read failed on first drive. Retry the read error on 789 * another disk drive, if available, before erroring out the 790 * read. 791 */ 792 sd->sd_disk->d_read_errs++; 793 G_RAID_LOGREQ(0, bp, 794 "Read error (%d), %d read errors total", 795 bp->bio_error, sd->sd_disk->d_read_errs); 796 797 /* 798 * If there are too many read errors, we move to degraded. 799 * XXX Do we want to FAIL the drive (eg, make the user redo 800 * everything to get it back in sync), or just degrade the 801 * drive, which kicks off a resync? 802 */ 803 do_write = 1; 804 if (sd->sd_disk->d_read_errs > g_raid_read_err_thresh) { 805 g_raid_tr_raid1_fail_disk(sd->sd_softc, sd, sd->sd_disk); 806 if (pbp->bio_children == 1) 807 do_write = 0; 808 } 809 810 /* 811 * Find the other disk, and try to do the I/O to it. 812 */ 813 mask = (uintptr_t *)(&pbp->bio_driver2); 814 if (pbp->bio_children == 1) { 815 /* Save original subdisk. */ 816 pbp->bio_driver1 = do_write ? sd : NULL; 817 *mask = 0; 818 } 819 *mask |= 1 << sd->sd_pos; 820 nsd = g_raid_tr_raid1_select_read_disk(vol, pbp, *mask); 821 if (nsd != NULL && (cbp = g_clone_bio(pbp)) != NULL) { 822 g_destroy_bio(bp); 823 G_RAID_LOGREQ(2, cbp, "Retrying read from %d", 824 nsd->sd_pos); 825 if (pbp->bio_children == 2 && do_write) { 826 sd->sd_recovery++; 827 cbp->bio_caller1 = nsd; 828 pbp->bio_pflags = G_RAID_BIO_FLAG_LOCKED; 829 /* Lock callback starts I/O */ 830 g_raid_lock_range(sd->sd_volume, 831 cbp->bio_offset, cbp->bio_length, pbp, cbp); 832 } else { 833 g_raid_subdisk_iostart(nsd, cbp); 834 } 835 return; 836 } 837 /* 838 * We can't retry. Return the original error by falling 839 * through. This will happen when there's only one good disk. 840 * We don't need to fail the raid, since its actual state is 841 * based on the state of the subdisks. 842 */ 843 G_RAID_LOGREQ(2, bp, "Couldn't retry read, failing it"); 844 } 845 if (bp->bio_cmd == BIO_READ && 846 bp->bio_error == 0 && 847 pbp->bio_children > 1 && 848 pbp->bio_driver1 != NULL) { 849 /* 850 * If it was a read, and bio_children is >1, then we just 851 * recovered the data from the second drive. We should try to 852 * write that data to the first drive if sector remapping is 853 * enabled. A write should put the data in a new place on the 854 * disk, remapping the bad sector. Do we need to do that by 855 * queueing a request to the main worker thread? It doesn't 856 * affect the return code of this current read, and can be 857 * done at our liesure. However, to make the code simpler, it 858 * is done syncrhonously. 859 */ 860 G_RAID_LOGREQ(3, bp, "Recovered data from other drive"); 861 cbp = g_clone_bio(pbp); 862 if (cbp != NULL) { 863 g_destroy_bio(bp); 864 cbp->bio_cmd = BIO_WRITE; 865 cbp->bio_cflags = G_RAID_BIO_FLAG_REMAP; 866 G_RAID_LOGREQ(2, cbp, 867 "Attempting bad sector remap on failing drive."); 868 g_raid_subdisk_iostart(pbp->bio_driver1, cbp); 869 return; 870 } 871 } 872 if (pbp->bio_pflags & G_RAID_BIO_FLAG_LOCKED) { 873 /* 874 * We're done with a recovery, mark the range as unlocked. 875 * For any write errors, we agressively fail the disk since 876 * there was both a READ and a WRITE error at this location. 877 * Both types of errors generally indicates the drive is on 878 * the verge of total failure anyway. Better to stop trusting 879 * it now. However, we need to reset error to 0 in that case 880 * because we're not failing the original I/O which succeeded. 881 */ 882 if (bp->bio_cmd == BIO_WRITE && bp->bio_error) { 883 G_RAID_LOGREQ(0, bp, "Remap write failed: " 884 "failing subdisk."); 885 g_raid_tr_raid1_fail_disk(sd->sd_softc, sd, sd->sd_disk); 886 bp->bio_error = 0; 887 } 888 if (pbp->bio_driver1 != NULL) { 889 ((struct g_raid_subdisk *)pbp->bio_driver1) 890 ->sd_recovery--; 891 } 892 G_RAID_LOGREQ(2, bp, "REMAP done %d.", bp->bio_error); 893 g_raid_unlock_range(sd->sd_volume, bp->bio_offset, 894 bp->bio_length); 895 } 896 error = bp->bio_error; 897 g_destroy_bio(bp); 898 if (pbp->bio_children == pbp->bio_inbed) { 899 pbp->bio_completed = pbp->bio_length; 900 g_raid_iodone(pbp, error); 901 } 902 } 903 904 static int 905 g_raid_tr_kerneldump_raid1(struct g_raid_tr_object *tr, 906 void *virtual, vm_offset_t physical, off_t offset, size_t length) 907 { 908 struct g_raid_volume *vol; 909 struct g_raid_subdisk *sd; 910 int error, i, ok; 911 912 vol = tr->tro_volume; 913 error = 0; 914 ok = 0; 915 for (i = 0; i < vol->v_disks_count; i++) { 916 sd = &vol->v_subdisks[i]; 917 switch (sd->sd_state) { 918 case G_RAID_SUBDISK_S_ACTIVE: 919 break; 920 case G_RAID_SUBDISK_S_REBUILD: 921 /* 922 * When rebuilding, only part of this subdisk is 923 * writable, the rest will be written as part of the 924 * that process. 925 */ 926 if (offset >= sd->sd_rebuild_pos) 927 continue; 928 break; 929 case G_RAID_SUBDISK_S_STALE: 930 case G_RAID_SUBDISK_S_RESYNC: 931 /* 932 * Resyncing still writes on the theory that the 933 * resync'd disk is very close and writing it will 934 * keep it that way better if we keep up while 935 * resyncing. 936 */ 937 break; 938 default: 939 continue; 940 } 941 error = g_raid_subdisk_kerneldump(sd, 942 virtual, physical, offset, length); 943 if (error == 0) 944 ok++; 945 } 946 return (ok > 0 ? 0 : error); 947 } 948 949 static int 950 g_raid_tr_locked_raid1(struct g_raid_tr_object *tr, void *argp) 951 { 952 struct bio *bp; 953 struct g_raid_subdisk *sd; 954 955 bp = (struct bio *)argp; 956 sd = (struct g_raid_subdisk *)bp->bio_caller1; 957 g_raid_subdisk_iostart(sd, bp); 958 959 return (0); 960 } 961 962 static int 963 g_raid_tr_idle_raid1(struct g_raid_tr_object *tr) 964 { 965 struct g_raid_tr_raid1_object *trs; 966 967 trs = (struct g_raid_tr_raid1_object *)tr; 968 trs->trso_fair_io = g_raid1_rebuild_fair_io; 969 trs->trso_recover_slabs = g_raid1_rebuild_cluster_idle; 970 if (trs->trso_type == TR_RAID1_REBUILD) 971 g_raid_tr_raid1_rebuild_some(tr); 972 return (0); 973 } 974 975 static int 976 g_raid_tr_free_raid1(struct g_raid_tr_object *tr) 977 { 978 struct g_raid_tr_raid1_object *trs; 979 980 trs = (struct g_raid_tr_raid1_object *)tr; 981 982 if (trs->trso_buffer != NULL) { 983 free(trs->trso_buffer, M_TR_RAID1); 984 trs->trso_buffer = NULL; 985 } 986 return (0); 987 } 988 989 G_RAID_TR_DECLARE(g_raid_tr_raid1);
Cache object: 1149285f38230d167ee895d75e6e76e9
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