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_raid1e.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/10.0/sys/geom/raid/tr_raid1e.c 248720 2013-03-26 05:42:12Z 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 #define N 2 46 47 SYSCTL_DECL(_kern_geom_raid_raid1e); 48 49 #define RAID1E_REBUILD_SLAB (1 << 20) /* One transation in a rebuild */ 50 static int g_raid1e_rebuild_slab = RAID1E_REBUILD_SLAB; 51 TUNABLE_INT("kern.geom.raid.raid1e.rebuild_slab_size", 52 &g_raid1e_rebuild_slab); 53 SYSCTL_UINT(_kern_geom_raid_raid1e, OID_AUTO, rebuild_slab_size, CTLFLAG_RW, 54 &g_raid1e_rebuild_slab, 0, 55 "Amount of the disk to rebuild each read/write cycle of the rebuild."); 56 57 #define RAID1E_REBUILD_FAIR_IO 20 /* use 1/x of the available I/O */ 58 static int g_raid1e_rebuild_fair_io = RAID1E_REBUILD_FAIR_IO; 59 TUNABLE_INT("kern.geom.raid.raid1e.rebuild_fair_io", 60 &g_raid1e_rebuild_fair_io); 61 SYSCTL_UINT(_kern_geom_raid_raid1e, OID_AUTO, rebuild_fair_io, CTLFLAG_RW, 62 &g_raid1e_rebuild_fair_io, 0, 63 "Fraction of the I/O bandwidth to use when disk busy for rebuild."); 64 65 #define RAID1E_REBUILD_CLUSTER_IDLE 100 66 static int g_raid1e_rebuild_cluster_idle = RAID1E_REBUILD_CLUSTER_IDLE; 67 TUNABLE_INT("kern.geom.raid.raid1e.rebuild_cluster_idle", 68 &g_raid1e_rebuild_cluster_idle); 69 SYSCTL_UINT(_kern_geom_raid_raid1e, OID_AUTO, rebuild_cluster_idle, CTLFLAG_RW, 70 &g_raid1e_rebuild_cluster_idle, 0, 71 "Number of slabs to do each time we trigger a rebuild cycle"); 72 73 #define RAID1E_REBUILD_META_UPDATE 1024 /* update meta data every 1GB or so */ 74 static int g_raid1e_rebuild_meta_update = RAID1E_REBUILD_META_UPDATE; 75 TUNABLE_INT("kern.geom.raid.raid1e.rebuild_meta_update", 76 &g_raid1e_rebuild_meta_update); 77 SYSCTL_UINT(_kern_geom_raid_raid1e, OID_AUTO, rebuild_meta_update, CTLFLAG_RW, 78 &g_raid1e_rebuild_meta_update, 0, 79 "When to update the meta data."); 80 81 static MALLOC_DEFINE(M_TR_RAID1E, "tr_raid1e_data", "GEOM_RAID RAID1E data"); 82 83 #define TR_RAID1E_NONE 0 84 #define TR_RAID1E_REBUILD 1 85 #define TR_RAID1E_RESYNC 2 86 87 #define TR_RAID1E_F_DOING_SOME 0x1 88 #define TR_RAID1E_F_LOCKED 0x2 89 #define TR_RAID1E_F_ABORT 0x4 90 91 struct g_raid_tr_raid1e_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 off_t trso_lock_pos; /* Locked range start. */ 103 off_t trso_lock_len; /* Locked range length. */ 104 struct bio trso_bio; 105 }; 106 107 static g_raid_tr_taste_t g_raid_tr_taste_raid1e; 108 static g_raid_tr_event_t g_raid_tr_event_raid1e; 109 static g_raid_tr_start_t g_raid_tr_start_raid1e; 110 static g_raid_tr_stop_t g_raid_tr_stop_raid1e; 111 static g_raid_tr_iostart_t g_raid_tr_iostart_raid1e; 112 static g_raid_tr_iodone_t g_raid_tr_iodone_raid1e; 113 static g_raid_tr_kerneldump_t g_raid_tr_kerneldump_raid1e; 114 static g_raid_tr_locked_t g_raid_tr_locked_raid1e; 115 static g_raid_tr_idle_t g_raid_tr_idle_raid1e; 116 static g_raid_tr_free_t g_raid_tr_free_raid1e; 117 118 static kobj_method_t g_raid_tr_raid1e_methods[] = { 119 KOBJMETHOD(g_raid_tr_taste, g_raid_tr_taste_raid1e), 120 KOBJMETHOD(g_raid_tr_event, g_raid_tr_event_raid1e), 121 KOBJMETHOD(g_raid_tr_start, g_raid_tr_start_raid1e), 122 KOBJMETHOD(g_raid_tr_stop, g_raid_tr_stop_raid1e), 123 KOBJMETHOD(g_raid_tr_iostart, g_raid_tr_iostart_raid1e), 124 KOBJMETHOD(g_raid_tr_iodone, g_raid_tr_iodone_raid1e), 125 KOBJMETHOD(g_raid_tr_kerneldump, g_raid_tr_kerneldump_raid1e), 126 KOBJMETHOD(g_raid_tr_locked, g_raid_tr_locked_raid1e), 127 KOBJMETHOD(g_raid_tr_idle, g_raid_tr_idle_raid1e), 128 KOBJMETHOD(g_raid_tr_free, g_raid_tr_free_raid1e), 129 { 0, 0 } 130 }; 131 132 static struct g_raid_tr_class g_raid_tr_raid1e_class = { 133 "RAID1E", 134 g_raid_tr_raid1e_methods, 135 sizeof(struct g_raid_tr_raid1e_object), 136 .trc_enable = 1, 137 .trc_priority = 200 138 }; 139 140 static void g_raid_tr_raid1e_rebuild_abort(struct g_raid_tr_object *tr); 141 static void g_raid_tr_raid1e_maybe_rebuild(struct g_raid_tr_object *tr, 142 struct g_raid_subdisk *sd); 143 static int g_raid_tr_raid1e_select_read_disk(struct g_raid_volume *vol, 144 int no, off_t off, off_t len, u_int mask); 145 146 static inline void 147 V2P(struct g_raid_volume *vol, off_t virt, 148 int *disk, off_t *offset, off_t *start) 149 { 150 off_t nstrip; 151 u_int strip_size; 152 153 strip_size = vol->v_strip_size; 154 /* Strip number. */ 155 nstrip = virt / strip_size; 156 /* Start position in strip. */ 157 *start = virt % strip_size; 158 /* Disk number. */ 159 *disk = (nstrip * N) % vol->v_disks_count; 160 /* Strip start position in disk. */ 161 *offset = ((nstrip * N) / vol->v_disks_count) * strip_size; 162 } 163 164 static inline void 165 P2V(struct g_raid_volume *vol, int disk, off_t offset, 166 off_t *virt, int *copy) 167 { 168 off_t nstrip, start; 169 u_int strip_size; 170 171 strip_size = vol->v_strip_size; 172 /* Start position in strip. */ 173 start = offset % strip_size; 174 /* Physical strip number. */ 175 nstrip = (offset / strip_size) * vol->v_disks_count + disk; 176 /* Number of physical strip (copy) inside virtual strip. */ 177 *copy = nstrip % N; 178 /* Offset in virtual space. */ 179 *virt = (nstrip / N) * strip_size + start; 180 } 181 182 static int 183 g_raid_tr_taste_raid1e(struct g_raid_tr_object *tr, struct g_raid_volume *vol) 184 { 185 struct g_raid_tr_raid1e_object *trs; 186 187 trs = (struct g_raid_tr_raid1e_object *)tr; 188 if (tr->tro_volume->v_raid_level != G_RAID_VOLUME_RL_RAID1E || 189 tr->tro_volume->v_raid_level_qualifier != G_RAID_VOLUME_RLQ_R1EA) 190 return (G_RAID_TR_TASTE_FAIL); 191 trs->trso_starting = 1; 192 return (G_RAID_TR_TASTE_SUCCEED); 193 } 194 195 static int 196 g_raid_tr_update_state_raid1e_even(struct g_raid_volume *vol) 197 { 198 struct g_raid_softc *sc; 199 struct g_raid_subdisk *sd, *bestsd, *worstsd; 200 int i, j, state, sstate; 201 202 sc = vol->v_softc; 203 state = G_RAID_VOLUME_S_OPTIMAL; 204 for (i = 0; i < vol->v_disks_count / N; i++) { 205 bestsd = &vol->v_subdisks[i * N]; 206 for (j = 1; j < N; j++) { 207 sd = &vol->v_subdisks[i * N + j]; 208 if (sd->sd_state > bestsd->sd_state) 209 bestsd = sd; 210 else if (sd->sd_state == bestsd->sd_state && 211 (sd->sd_state == G_RAID_SUBDISK_S_REBUILD || 212 sd->sd_state == G_RAID_SUBDISK_S_RESYNC) && 213 sd->sd_rebuild_pos > bestsd->sd_rebuild_pos) 214 bestsd = sd; 215 } 216 if (bestsd->sd_state >= G_RAID_SUBDISK_S_UNINITIALIZED && 217 bestsd->sd_state != G_RAID_SUBDISK_S_ACTIVE) { 218 /* We found reasonable candidate. */ 219 G_RAID_DEBUG1(1, sc, 220 "Promote subdisk %s:%d from %s to ACTIVE.", 221 vol->v_name, bestsd->sd_pos, 222 g_raid_subdisk_state2str(bestsd->sd_state)); 223 g_raid_change_subdisk_state(bestsd, 224 G_RAID_SUBDISK_S_ACTIVE); 225 g_raid_write_metadata(sc, 226 vol, bestsd, bestsd->sd_disk); 227 } 228 worstsd = &vol->v_subdisks[i * N]; 229 for (j = 1; j < N; j++) { 230 sd = &vol->v_subdisks[i * N + j]; 231 if (sd->sd_state < worstsd->sd_state) 232 worstsd = sd; 233 } 234 if (worstsd->sd_state == G_RAID_SUBDISK_S_ACTIVE) 235 sstate = G_RAID_VOLUME_S_OPTIMAL; 236 else if (worstsd->sd_state >= G_RAID_SUBDISK_S_STALE) 237 sstate = G_RAID_VOLUME_S_SUBOPTIMAL; 238 else if (bestsd->sd_state == G_RAID_SUBDISK_S_ACTIVE) 239 sstate = G_RAID_VOLUME_S_DEGRADED; 240 else 241 sstate = G_RAID_VOLUME_S_BROKEN; 242 if (sstate < state) 243 state = sstate; 244 } 245 return (state); 246 } 247 248 static int 249 g_raid_tr_update_state_raid1e_odd(struct g_raid_volume *vol) 250 { 251 struct g_raid_softc *sc; 252 struct g_raid_subdisk *sd, *bestsd, *worstsd; 253 int i, j, state, sstate; 254 255 sc = vol->v_softc; 256 if (g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_ACTIVE) == 257 vol->v_disks_count) 258 return (G_RAID_VOLUME_S_OPTIMAL); 259 for (i = 0; i < vol->v_disks_count; i++) { 260 sd = &vol->v_subdisks[i]; 261 if (sd->sd_state == G_RAID_SUBDISK_S_UNINITIALIZED) { 262 /* We found reasonable candidate. */ 263 G_RAID_DEBUG1(1, sc, 264 "Promote subdisk %s:%d from %s to STALE.", 265 vol->v_name, sd->sd_pos, 266 g_raid_subdisk_state2str(sd->sd_state)); 267 g_raid_change_subdisk_state(sd, 268 G_RAID_SUBDISK_S_STALE); 269 g_raid_write_metadata(sc, vol, sd, sd->sd_disk); 270 } 271 } 272 state = G_RAID_VOLUME_S_OPTIMAL; 273 for (i = 0; i < vol->v_disks_count; i++) { 274 bestsd = &vol->v_subdisks[i]; 275 worstsd = &vol->v_subdisks[i]; 276 for (j = 1; j < N; j++) { 277 sd = &vol->v_subdisks[(i + j) % vol->v_disks_count]; 278 if (sd->sd_state > bestsd->sd_state) 279 bestsd = sd; 280 else if (sd->sd_state == bestsd->sd_state && 281 (sd->sd_state == G_RAID_SUBDISK_S_REBUILD || 282 sd->sd_state == G_RAID_SUBDISK_S_RESYNC) && 283 sd->sd_rebuild_pos > bestsd->sd_rebuild_pos) 284 bestsd = sd; 285 if (sd->sd_state < worstsd->sd_state) 286 worstsd = sd; 287 } 288 if (worstsd->sd_state == G_RAID_SUBDISK_S_ACTIVE) 289 sstate = G_RAID_VOLUME_S_OPTIMAL; 290 else if (worstsd->sd_state >= G_RAID_SUBDISK_S_STALE) 291 sstate = G_RAID_VOLUME_S_SUBOPTIMAL; 292 else if (bestsd->sd_state >= G_RAID_SUBDISK_S_STALE) 293 sstate = G_RAID_VOLUME_S_DEGRADED; 294 else 295 sstate = G_RAID_VOLUME_S_BROKEN; 296 if (sstate < state) 297 state = sstate; 298 } 299 return (state); 300 } 301 302 static int 303 g_raid_tr_update_state_raid1e(struct g_raid_volume *vol, 304 struct g_raid_subdisk *sd) 305 { 306 struct g_raid_tr_raid1e_object *trs; 307 struct g_raid_softc *sc; 308 u_int s; 309 310 sc = vol->v_softc; 311 trs = (struct g_raid_tr_raid1e_object *)vol->v_tr; 312 if (trs->trso_stopping && 313 (trs->trso_flags & TR_RAID1E_F_DOING_SOME) == 0) 314 s = G_RAID_VOLUME_S_STOPPED; 315 else if (trs->trso_starting) 316 s = G_RAID_VOLUME_S_STARTING; 317 else { 318 if ((vol->v_disks_count % N) == 0) 319 s = g_raid_tr_update_state_raid1e_even(vol); 320 else 321 s = g_raid_tr_update_state_raid1e_odd(vol); 322 } 323 if (s != vol->v_state) { 324 g_raid_event_send(vol, G_RAID_VOLUME_S_ALIVE(s) ? 325 G_RAID_VOLUME_E_UP : G_RAID_VOLUME_E_DOWN, 326 G_RAID_EVENT_VOLUME); 327 g_raid_change_volume_state(vol, s); 328 if (!trs->trso_starting && !trs->trso_stopping) 329 g_raid_write_metadata(sc, vol, NULL, NULL); 330 } 331 if (!trs->trso_starting && !trs->trso_stopping) 332 g_raid_tr_raid1e_maybe_rebuild(vol->v_tr, sd); 333 return (0); 334 } 335 336 static void 337 g_raid_tr_raid1e_fail_disk(struct g_raid_softc *sc, struct g_raid_subdisk *sd, 338 struct g_raid_disk *disk) 339 { 340 struct g_raid_volume *vol; 341 342 vol = sd->sd_volume; 343 /* 344 * We don't fail the last disk in the pack, since it still has decent 345 * data on it and that's better than failing the disk if it is the root 346 * file system. 347 * 348 * XXX should this be controlled via a tunable? It makes sense for 349 * the volume that has / on it. I can't think of a case where we'd 350 * want the volume to go away on this kind of event. 351 */ 352 if ((g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_ACTIVE) + 353 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_RESYNC) + 354 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_STALE) + 355 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_UNINITIALIZED) < 356 vol->v_disks_count) && 357 (sd->sd_state >= G_RAID_SUBDISK_S_UNINITIALIZED)) 358 return; 359 g_raid_fail_disk(sc, sd, disk); 360 } 361 362 static void 363 g_raid_tr_raid1e_rebuild_done(struct g_raid_tr_raid1e_object *trs) 364 { 365 struct g_raid_volume *vol; 366 struct g_raid_subdisk *sd; 367 368 vol = trs->trso_base.tro_volume; 369 sd = trs->trso_failed_sd; 370 g_raid_write_metadata(vol->v_softc, vol, sd, sd->sd_disk); 371 free(trs->trso_buffer, M_TR_RAID1E); 372 trs->trso_buffer = NULL; 373 trs->trso_flags &= ~TR_RAID1E_F_DOING_SOME; 374 trs->trso_type = TR_RAID1E_NONE; 375 trs->trso_recover_slabs = 0; 376 trs->trso_failed_sd = NULL; 377 g_raid_tr_update_state_raid1e(vol, NULL); 378 } 379 380 static void 381 g_raid_tr_raid1e_rebuild_finish(struct g_raid_tr_object *tr) 382 { 383 struct g_raid_tr_raid1e_object *trs; 384 struct g_raid_subdisk *sd; 385 386 trs = (struct g_raid_tr_raid1e_object *)tr; 387 sd = trs->trso_failed_sd; 388 G_RAID_DEBUG1(0, tr->tro_volume->v_softc, 389 "Subdisk %s:%d-%s rebuild completed.", 390 sd->sd_volume->v_name, sd->sd_pos, 391 sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]"); 392 g_raid_change_subdisk_state(sd, G_RAID_SUBDISK_S_ACTIVE); 393 sd->sd_rebuild_pos = 0; 394 g_raid_tr_raid1e_rebuild_done(trs); 395 } 396 397 static void 398 g_raid_tr_raid1e_rebuild_abort(struct g_raid_tr_object *tr) 399 { 400 struct g_raid_tr_raid1e_object *trs; 401 struct g_raid_subdisk *sd; 402 struct g_raid_volume *vol; 403 404 vol = tr->tro_volume; 405 trs = (struct g_raid_tr_raid1e_object *)tr; 406 sd = trs->trso_failed_sd; 407 if (trs->trso_flags & TR_RAID1E_F_DOING_SOME) { 408 G_RAID_DEBUG1(1, vol->v_softc, 409 "Subdisk %s:%d-%s rebuild is aborting.", 410 sd->sd_volume->v_name, sd->sd_pos, 411 sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]"); 412 trs->trso_flags |= TR_RAID1E_F_ABORT; 413 } else { 414 G_RAID_DEBUG1(0, vol->v_softc, 415 "Subdisk %s:%d-%s rebuild aborted.", 416 sd->sd_volume->v_name, sd->sd_pos, 417 sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]"); 418 trs->trso_flags &= ~TR_RAID1E_F_ABORT; 419 if (trs->trso_flags & TR_RAID1E_F_LOCKED) { 420 trs->trso_flags &= ~TR_RAID1E_F_LOCKED; 421 g_raid_unlock_range(tr->tro_volume, 422 trs->trso_lock_pos, trs->trso_lock_len); 423 } 424 g_raid_tr_raid1e_rebuild_done(trs); 425 } 426 } 427 428 static void 429 g_raid_tr_raid1e_rebuild_some(struct g_raid_tr_object *tr) 430 { 431 struct g_raid_tr_raid1e_object *trs; 432 struct g_raid_softc *sc; 433 struct g_raid_volume *vol; 434 struct g_raid_subdisk *sd; 435 struct bio *bp; 436 off_t len, virtual, vend, offset, start; 437 int disk, copy, best; 438 439 trs = (struct g_raid_tr_raid1e_object *)tr; 440 if (trs->trso_flags & TR_RAID1E_F_DOING_SOME) 441 return; 442 vol = tr->tro_volume; 443 sc = vol->v_softc; 444 sd = trs->trso_failed_sd; 445 446 while (1) { 447 if (sd->sd_rebuild_pos >= sd->sd_size) { 448 g_raid_tr_raid1e_rebuild_finish(tr); 449 return; 450 } 451 /* Get virtual offset from physical rebuild position. */ 452 P2V(vol, sd->sd_pos, sd->sd_rebuild_pos, &virtual, ©); 453 /* Get physical offset back to get first stripe position. */ 454 V2P(vol, virtual, &disk, &offset, &start); 455 /* Calculate contignous data length. */ 456 len = MIN(g_raid1e_rebuild_slab, 457 sd->sd_size - sd->sd_rebuild_pos); 458 if ((vol->v_disks_count % N) != 0) 459 len = MIN(len, vol->v_strip_size - start); 460 /* Find disk with most accurate data. */ 461 best = g_raid_tr_raid1e_select_read_disk(vol, disk, 462 offset + start, len, 0); 463 if (best < 0) { 464 /* There is no any valid disk. */ 465 g_raid_tr_raid1e_rebuild_abort(tr); 466 return; 467 } else if (best != copy) { 468 /* Some other disk has better data. */ 469 break; 470 } 471 /* We have the most accurate data. Skip the range. */ 472 G_RAID_DEBUG1(3, sc, "Skipping rebuild for range %ju - %ju", 473 sd->sd_rebuild_pos, sd->sd_rebuild_pos + len); 474 sd->sd_rebuild_pos += len; 475 } 476 477 bp = &trs->trso_bio; 478 memset(bp, 0, sizeof(*bp)); 479 bp->bio_offset = offset + start + 480 ((disk + best >= vol->v_disks_count) ? vol->v_strip_size : 0); 481 bp->bio_length = len; 482 bp->bio_data = trs->trso_buffer; 483 bp->bio_cmd = BIO_READ; 484 bp->bio_cflags = G_RAID_BIO_FLAG_SYNC; 485 bp->bio_caller1 = &vol->v_subdisks[(disk + best) % vol->v_disks_count]; 486 G_RAID_LOGREQ(3, bp, "Queueing rebuild read"); 487 /* 488 * If we are crossing stripe boundary, correct affected virtual 489 * range we should lock. 490 */ 491 if (start + len > vol->v_strip_size) { 492 P2V(vol, sd->sd_pos, sd->sd_rebuild_pos + len, &vend, ©); 493 len = vend - virtual; 494 } 495 trs->trso_flags |= TR_RAID1E_F_DOING_SOME; 496 trs->trso_flags |= TR_RAID1E_F_LOCKED; 497 trs->trso_lock_pos = virtual; 498 trs->trso_lock_len = len; 499 /* Lock callback starts I/O */ 500 g_raid_lock_range(sd->sd_volume, virtual, len, NULL, bp); 501 } 502 503 static void 504 g_raid_tr_raid1e_rebuild_start(struct g_raid_tr_object *tr) 505 { 506 struct g_raid_volume *vol; 507 struct g_raid_tr_raid1e_object *trs; 508 struct g_raid_subdisk *sd; 509 510 vol = tr->tro_volume; 511 trs = (struct g_raid_tr_raid1e_object *)tr; 512 if (trs->trso_failed_sd) { 513 G_RAID_DEBUG1(1, vol->v_softc, 514 "Already rebuild in start rebuild. pos %jd\n", 515 (intmax_t)trs->trso_failed_sd->sd_rebuild_pos); 516 return; 517 } 518 sd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_RESYNC); 519 if (sd == NULL) 520 sd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_REBUILD); 521 if (sd == NULL) { 522 sd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_STALE); 523 if (sd != NULL) { 524 sd->sd_rebuild_pos = 0; 525 g_raid_change_subdisk_state(sd, 526 G_RAID_SUBDISK_S_RESYNC); 527 g_raid_write_metadata(vol->v_softc, vol, sd, NULL); 528 } else { 529 sd = g_raid_get_subdisk(vol, 530 G_RAID_SUBDISK_S_UNINITIALIZED); 531 if (sd == NULL) 532 sd = g_raid_get_subdisk(vol, 533 G_RAID_SUBDISK_S_NEW); 534 if (sd != NULL) { 535 sd->sd_rebuild_pos = 0; 536 g_raid_change_subdisk_state(sd, 537 G_RAID_SUBDISK_S_REBUILD); 538 g_raid_write_metadata(vol->v_softc, 539 vol, sd, NULL); 540 } 541 } 542 } 543 if (sd == NULL) { 544 G_RAID_DEBUG1(1, vol->v_softc, 545 "No failed disk to rebuild. night night."); 546 return; 547 } 548 trs->trso_failed_sd = sd; 549 G_RAID_DEBUG1(0, vol->v_softc, 550 "Subdisk %s:%d-%s rebuild start at %jd.", 551 sd->sd_volume->v_name, sd->sd_pos, 552 sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]", 553 trs->trso_failed_sd->sd_rebuild_pos); 554 trs->trso_type = TR_RAID1E_REBUILD; 555 trs->trso_buffer = malloc(g_raid1e_rebuild_slab, M_TR_RAID1E, M_WAITOK); 556 trs->trso_meta_update = g_raid1e_rebuild_meta_update; 557 g_raid_tr_raid1e_rebuild_some(tr); 558 } 559 560 static void 561 g_raid_tr_raid1e_maybe_rebuild(struct g_raid_tr_object *tr, 562 struct g_raid_subdisk *sd) 563 { 564 struct g_raid_volume *vol; 565 struct g_raid_tr_raid1e_object *trs; 566 int nr; 567 568 vol = tr->tro_volume; 569 trs = (struct g_raid_tr_raid1e_object *)tr; 570 if (trs->trso_stopping) 571 return; 572 nr = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_REBUILD) + 573 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_RESYNC); 574 switch(trs->trso_type) { 575 case TR_RAID1E_NONE: 576 if (vol->v_state < G_RAID_VOLUME_S_DEGRADED) 577 return; 578 if (nr == 0) { 579 nr = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_NEW) + 580 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_STALE) + 581 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_UNINITIALIZED); 582 if (nr == 0) 583 return; 584 } 585 g_raid_tr_raid1e_rebuild_start(tr); 586 break; 587 case TR_RAID1E_REBUILD: 588 if (vol->v_state < G_RAID_VOLUME_S_DEGRADED || nr == 0 || 589 trs->trso_failed_sd == sd) 590 g_raid_tr_raid1e_rebuild_abort(tr); 591 break; 592 case TR_RAID1E_RESYNC: 593 break; 594 } 595 } 596 597 static int 598 g_raid_tr_event_raid1e(struct g_raid_tr_object *tr, 599 struct g_raid_subdisk *sd, u_int event) 600 { 601 602 g_raid_tr_update_state_raid1e(tr->tro_volume, sd); 603 return (0); 604 } 605 606 static int 607 g_raid_tr_start_raid1e(struct g_raid_tr_object *tr) 608 { 609 struct g_raid_tr_raid1e_object *trs; 610 struct g_raid_volume *vol; 611 612 trs = (struct g_raid_tr_raid1e_object *)tr; 613 vol = tr->tro_volume; 614 trs->trso_starting = 0; 615 g_raid_tr_update_state_raid1e(vol, NULL); 616 return (0); 617 } 618 619 static int 620 g_raid_tr_stop_raid1e(struct g_raid_tr_object *tr) 621 { 622 struct g_raid_tr_raid1e_object *trs; 623 struct g_raid_volume *vol; 624 625 trs = (struct g_raid_tr_raid1e_object *)tr; 626 vol = tr->tro_volume; 627 trs->trso_starting = 0; 628 trs->trso_stopping = 1; 629 g_raid_tr_update_state_raid1e(vol, NULL); 630 return (0); 631 } 632 633 /* 634 * Select the disk to read from. Take into account: subdisk state, running 635 * error recovery, average disk load, head position and possible cache hits. 636 */ 637 #define ABS(x) (((x) >= 0) ? (x) : (-(x))) 638 static int 639 g_raid_tr_raid1e_select_read_disk(struct g_raid_volume *vol, 640 int no, off_t off, off_t len, u_int mask) 641 { 642 struct g_raid_subdisk *sd; 643 off_t offset; 644 int i, best, prio, bestprio; 645 646 best = -1; 647 bestprio = INT_MAX; 648 for (i = 0; i < N; i++) { 649 sd = &vol->v_subdisks[(no + i) % vol->v_disks_count]; 650 offset = off; 651 if (no + i >= vol->v_disks_count) 652 offset += vol->v_strip_size; 653 654 prio = G_RAID_SUBDISK_LOAD(sd); 655 if ((mask & (1 << sd->sd_pos)) != 0) 656 continue; 657 switch (sd->sd_state) { 658 case G_RAID_SUBDISK_S_ACTIVE: 659 break; 660 case G_RAID_SUBDISK_S_RESYNC: 661 if (offset + off < sd->sd_rebuild_pos) 662 break; 663 /* FALLTHROUGH */ 664 case G_RAID_SUBDISK_S_STALE: 665 prio += i << 24; 666 break; 667 case G_RAID_SUBDISK_S_REBUILD: 668 if (offset + off < sd->sd_rebuild_pos) 669 break; 670 /* FALLTHROUGH */ 671 default: 672 continue; 673 } 674 prio += min(sd->sd_recovery, 255) << 16; 675 /* If disk head is precisely in position - highly prefer it. */ 676 if (G_RAID_SUBDISK_POS(sd) == offset) 677 prio -= 2 * G_RAID_SUBDISK_LOAD_SCALE; 678 else 679 /* If disk head is close to position - prefer it. */ 680 if (ABS(G_RAID_SUBDISK_POS(sd) - offset) < 681 G_RAID_SUBDISK_TRACK_SIZE) 682 prio -= 1 * G_RAID_SUBDISK_LOAD_SCALE; 683 if (prio < bestprio) { 684 bestprio = prio; 685 best = i; 686 } 687 } 688 return (best); 689 } 690 691 static void 692 g_raid_tr_iostart_raid1e_read(struct g_raid_tr_object *tr, struct bio *bp) 693 { 694 struct g_raid_volume *vol; 695 struct g_raid_subdisk *sd; 696 struct bio_queue_head queue; 697 struct bio *cbp; 698 char *addr; 699 off_t offset, start, length, remain; 700 u_int no, strip_size; 701 int best; 702 703 vol = tr->tro_volume; 704 addr = bp->bio_data; 705 strip_size = vol->v_strip_size; 706 V2P(vol, bp->bio_offset, &no, &offset, &start); 707 remain = bp->bio_length; 708 bioq_init(&queue); 709 while (remain > 0) { 710 length = MIN(strip_size - start, remain); 711 best = g_raid_tr_raid1e_select_read_disk(vol, 712 no, offset, length, 0); 713 KASSERT(best >= 0, ("No readable disk in volume %s!", 714 vol->v_name)); 715 no += best; 716 if (no >= vol->v_disks_count) { 717 no -= vol->v_disks_count; 718 offset += strip_size; 719 } 720 cbp = g_clone_bio(bp); 721 if (cbp == NULL) 722 goto failure; 723 cbp->bio_offset = offset + start; 724 cbp->bio_data = addr; 725 cbp->bio_length = length; 726 cbp->bio_caller1 = &vol->v_subdisks[no]; 727 bioq_insert_tail(&queue, cbp); 728 no += N - best; 729 if (no >= vol->v_disks_count) { 730 no -= vol->v_disks_count; 731 offset += strip_size; 732 } 733 remain -= length; 734 addr += length; 735 start = 0; 736 } 737 for (cbp = bioq_first(&queue); cbp != NULL; 738 cbp = bioq_first(&queue)) { 739 bioq_remove(&queue, cbp); 740 sd = cbp->bio_caller1; 741 cbp->bio_caller1 = NULL; 742 g_raid_subdisk_iostart(sd, cbp); 743 } 744 return; 745 failure: 746 for (cbp = bioq_first(&queue); cbp != NULL; 747 cbp = bioq_first(&queue)) { 748 bioq_remove(&queue, cbp); 749 g_destroy_bio(cbp); 750 } 751 if (bp->bio_error == 0) 752 bp->bio_error = ENOMEM; 753 g_raid_iodone(bp, bp->bio_error); 754 } 755 756 static void 757 g_raid_tr_iostart_raid1e_write(struct g_raid_tr_object *tr, struct bio *bp) 758 { 759 struct g_raid_volume *vol; 760 struct g_raid_subdisk *sd; 761 struct bio_queue_head queue; 762 struct bio *cbp; 763 char *addr; 764 off_t offset, start, length, remain; 765 u_int no, strip_size; 766 int i; 767 768 vol = tr->tro_volume; 769 addr = bp->bio_data; 770 strip_size = vol->v_strip_size; 771 V2P(vol, bp->bio_offset, &no, &offset, &start); 772 remain = bp->bio_length; 773 bioq_init(&queue); 774 while (remain > 0) { 775 length = MIN(strip_size - start, remain); 776 for (i = 0; i < N; i++) { 777 sd = &vol->v_subdisks[no]; 778 switch (sd->sd_state) { 779 case G_RAID_SUBDISK_S_ACTIVE: 780 case G_RAID_SUBDISK_S_STALE: 781 case G_RAID_SUBDISK_S_RESYNC: 782 break; 783 case G_RAID_SUBDISK_S_REBUILD: 784 if (offset + start >= sd->sd_rebuild_pos) 785 goto nextdisk; 786 break; 787 default: 788 goto nextdisk; 789 } 790 cbp = g_clone_bio(bp); 791 if (cbp == NULL) 792 goto failure; 793 cbp->bio_offset = offset + start; 794 cbp->bio_data = addr; 795 cbp->bio_length = length; 796 cbp->bio_caller1 = sd; 797 bioq_insert_tail(&queue, cbp); 798 nextdisk: 799 if (++no >= vol->v_disks_count) { 800 no = 0; 801 offset += strip_size; 802 } 803 } 804 remain -= length; 805 if (bp->bio_cmd != BIO_DELETE) 806 addr += length; 807 start = 0; 808 } 809 for (cbp = bioq_first(&queue); cbp != NULL; 810 cbp = bioq_first(&queue)) { 811 bioq_remove(&queue, cbp); 812 sd = cbp->bio_caller1; 813 cbp->bio_caller1 = NULL; 814 g_raid_subdisk_iostart(sd, cbp); 815 } 816 return; 817 failure: 818 for (cbp = bioq_first(&queue); cbp != NULL; 819 cbp = bioq_first(&queue)) { 820 bioq_remove(&queue, cbp); 821 g_destroy_bio(cbp); 822 } 823 if (bp->bio_error == 0) 824 bp->bio_error = ENOMEM; 825 g_raid_iodone(bp, bp->bio_error); 826 } 827 828 static void 829 g_raid_tr_iostart_raid1e(struct g_raid_tr_object *tr, struct bio *bp) 830 { 831 struct g_raid_volume *vol; 832 struct g_raid_tr_raid1e_object *trs; 833 834 vol = tr->tro_volume; 835 trs = (struct g_raid_tr_raid1e_object *)tr; 836 if (vol->v_state != G_RAID_VOLUME_S_OPTIMAL && 837 vol->v_state != G_RAID_VOLUME_S_SUBOPTIMAL && 838 vol->v_state != G_RAID_VOLUME_S_DEGRADED) { 839 g_raid_iodone(bp, EIO); 840 return; 841 } 842 /* 843 * If we're rebuilding, squeeze in rebuild activity every so often, 844 * even when the disk is busy. Be sure to only count real I/O 845 * to the disk. All 'SPECIAL' I/O is traffic generated to the disk 846 * by this module. 847 */ 848 if (trs->trso_failed_sd != NULL && 849 !(bp->bio_cflags & G_RAID_BIO_FLAG_SPECIAL)) { 850 /* Make this new or running now round short. */ 851 trs->trso_recover_slabs = 0; 852 if (--trs->trso_fair_io <= 0) { 853 trs->trso_fair_io = g_raid1e_rebuild_fair_io; 854 g_raid_tr_raid1e_rebuild_some(tr); 855 } 856 } 857 switch (bp->bio_cmd) { 858 case BIO_READ: 859 g_raid_tr_iostart_raid1e_read(tr, bp); 860 break; 861 case BIO_WRITE: 862 case BIO_DELETE: 863 g_raid_tr_iostart_raid1e_write(tr, bp); 864 break; 865 case BIO_FLUSH: 866 g_raid_tr_flush_common(tr, bp); 867 break; 868 default: 869 KASSERT(1 == 0, ("Invalid command here: %u (volume=%s)", 870 bp->bio_cmd, vol->v_name)); 871 break; 872 } 873 } 874 875 static void 876 g_raid_tr_iodone_raid1e(struct g_raid_tr_object *tr, 877 struct g_raid_subdisk *sd, struct bio *bp) 878 { 879 struct bio *cbp; 880 struct g_raid_subdisk *nsd; 881 struct g_raid_volume *vol; 882 struct bio *pbp; 883 struct g_raid_tr_raid1e_object *trs; 884 off_t virtual, offset, start; 885 uintptr_t mask; 886 int error, do_write, copy, disk, best; 887 888 trs = (struct g_raid_tr_raid1e_object *)tr; 889 vol = tr->tro_volume; 890 if (bp->bio_cflags & G_RAID_BIO_FLAG_SYNC) { 891 if (trs->trso_type == TR_RAID1E_REBUILD) { 892 nsd = trs->trso_failed_sd; 893 if (bp->bio_cmd == BIO_READ) { 894 895 /* Immediately abort rebuild, if requested. */ 896 if (trs->trso_flags & TR_RAID1E_F_ABORT) { 897 trs->trso_flags &= ~TR_RAID1E_F_DOING_SOME; 898 g_raid_tr_raid1e_rebuild_abort(tr); 899 return; 900 } 901 902 /* On read error, skip and cross fingers. */ 903 if (bp->bio_error != 0) { 904 G_RAID_LOGREQ(0, bp, 905 "Read error during rebuild (%d), " 906 "possible data loss!", 907 bp->bio_error); 908 goto rebuild_round_done; 909 } 910 911 /* 912 * The read operation finished, queue the 913 * write and get out. 914 */ 915 G_RAID_LOGREQ(3, bp, "Rebuild read done: %d", 916 bp->bio_error); 917 bp->bio_cmd = BIO_WRITE; 918 bp->bio_cflags = G_RAID_BIO_FLAG_SYNC; 919 bp->bio_offset = nsd->sd_rebuild_pos; 920 G_RAID_LOGREQ(3, bp, "Queueing rebuild write."); 921 g_raid_subdisk_iostart(nsd, bp); 922 } else { 923 /* 924 * The write operation just finished. Do 925 * another. We keep cloning the master bio 926 * since it has the right buffers allocated to 927 * it. 928 */ 929 G_RAID_LOGREQ(3, bp, "Rebuild write done: %d", 930 bp->bio_error); 931 if (bp->bio_error != 0 || 932 trs->trso_flags & TR_RAID1E_F_ABORT) { 933 if ((trs->trso_flags & 934 TR_RAID1E_F_ABORT) == 0) { 935 g_raid_tr_raid1e_fail_disk(sd->sd_softc, 936 nsd, nsd->sd_disk); 937 } 938 trs->trso_flags &= ~TR_RAID1E_F_DOING_SOME; 939 g_raid_tr_raid1e_rebuild_abort(tr); 940 return; 941 } 942 rebuild_round_done: 943 trs->trso_flags &= ~TR_RAID1E_F_LOCKED; 944 g_raid_unlock_range(tr->tro_volume, 945 trs->trso_lock_pos, trs->trso_lock_len); 946 nsd->sd_rebuild_pos += bp->bio_length; 947 if (nsd->sd_rebuild_pos >= nsd->sd_size) { 948 g_raid_tr_raid1e_rebuild_finish(tr); 949 return; 950 } 951 952 /* Abort rebuild if we are stopping */ 953 if (trs->trso_stopping) { 954 trs->trso_flags &= ~TR_RAID1E_F_DOING_SOME; 955 g_raid_tr_raid1e_rebuild_abort(tr); 956 return; 957 } 958 959 if (--trs->trso_meta_update <= 0) { 960 g_raid_write_metadata(vol->v_softc, 961 vol, nsd, nsd->sd_disk); 962 trs->trso_meta_update = 963 g_raid1e_rebuild_meta_update; 964 /* Compensate short rebuild I/Os. */ 965 if ((vol->v_disks_count % N) != 0 && 966 vol->v_strip_size < 967 g_raid1e_rebuild_slab) { 968 trs->trso_meta_update *= 969 g_raid1e_rebuild_slab; 970 trs->trso_meta_update /= 971 vol->v_strip_size; 972 } 973 } 974 trs->trso_flags &= ~TR_RAID1E_F_DOING_SOME; 975 if (--trs->trso_recover_slabs <= 0) 976 return; 977 /* Run next rebuild iteration. */ 978 g_raid_tr_raid1e_rebuild_some(tr); 979 } 980 } else if (trs->trso_type == TR_RAID1E_RESYNC) { 981 /* 982 * read good sd, read bad sd in parallel. when both 983 * done, compare the buffers. write good to the bad 984 * if different. do the next bit of work. 985 */ 986 panic("Somehow, we think we're doing a resync"); 987 } 988 return; 989 } 990 pbp = bp->bio_parent; 991 pbp->bio_inbed++; 992 mask = (intptr_t)bp->bio_caller2; 993 if (bp->bio_cmd == BIO_READ && bp->bio_error != 0) { 994 /* 995 * Read failed on first drive. Retry the read error on 996 * another disk drive, if available, before erroring out the 997 * read. 998 */ 999 sd->sd_disk->d_read_errs++; 1000 G_RAID_LOGREQ(0, bp, 1001 "Read error (%d), %d read errors total", 1002 bp->bio_error, sd->sd_disk->d_read_errs); 1003 1004 /* 1005 * If there are too many read errors, we move to degraded. 1006 * XXX Do we want to FAIL the drive (eg, make the user redo 1007 * everything to get it back in sync), or just degrade the 1008 * drive, which kicks off a resync? 1009 */ 1010 do_write = 0; 1011 if (sd->sd_disk->d_read_errs > g_raid_read_err_thresh) 1012 g_raid_tr_raid1e_fail_disk(sd->sd_softc, sd, sd->sd_disk); 1013 else if (mask == 0) 1014 do_write = 1; 1015 1016 /* Restore what we were doing. */ 1017 P2V(vol, sd->sd_pos, bp->bio_offset, &virtual, ©); 1018 V2P(vol, virtual, &disk, &offset, &start); 1019 1020 /* Find the other disk, and try to do the I/O to it. */ 1021 mask |= 1 << copy; 1022 best = g_raid_tr_raid1e_select_read_disk(vol, 1023 disk, offset, start, mask); 1024 if (best >= 0 && (cbp = g_clone_bio(pbp)) != NULL) { 1025 disk += best; 1026 if (disk >= vol->v_disks_count) { 1027 disk -= vol->v_disks_count; 1028 offset += vol->v_strip_size; 1029 } 1030 cbp->bio_offset = offset + start; 1031 cbp->bio_length = bp->bio_length; 1032 cbp->bio_data = bp->bio_data; 1033 g_destroy_bio(bp); 1034 nsd = &vol->v_subdisks[disk]; 1035 G_RAID_LOGREQ(2, cbp, "Retrying read from %d", 1036 nsd->sd_pos); 1037 if (do_write) 1038 mask |= 1 << 31; 1039 if ((mask & (1 << 31)) != 0) 1040 sd->sd_recovery++; 1041 cbp->bio_caller2 = (void *)mask; 1042 if (do_write) { 1043 cbp->bio_caller1 = nsd; 1044 /* Lock callback starts I/O */ 1045 g_raid_lock_range(sd->sd_volume, 1046 virtual, cbp->bio_length, pbp, cbp); 1047 } else { 1048 g_raid_subdisk_iostart(nsd, cbp); 1049 } 1050 return; 1051 } 1052 /* 1053 * We can't retry. Return the original error by falling 1054 * through. This will happen when there's only one good disk. 1055 * We don't need to fail the raid, since its actual state is 1056 * based on the state of the subdisks. 1057 */ 1058 G_RAID_LOGREQ(2, bp, "Couldn't retry read, failing it"); 1059 } 1060 if (bp->bio_cmd == BIO_READ && 1061 bp->bio_error == 0 && 1062 (mask & (1 << 31)) != 0) { 1063 G_RAID_LOGREQ(3, bp, "Recovered data from other drive"); 1064 1065 /* Restore what we were doing. */ 1066 P2V(vol, sd->sd_pos, bp->bio_offset, &virtual, ©); 1067 V2P(vol, virtual, &disk, &offset, &start); 1068 1069 /* Find best disk to write. */ 1070 best = g_raid_tr_raid1e_select_read_disk(vol, 1071 disk, offset, start, ~mask); 1072 if (best >= 0 && (cbp = g_clone_bio(pbp)) != NULL) { 1073 disk += best; 1074 if (disk >= vol->v_disks_count) { 1075 disk -= vol->v_disks_count; 1076 offset += vol->v_strip_size; 1077 } 1078 cbp->bio_offset = offset + start; 1079 cbp->bio_cmd = BIO_WRITE; 1080 cbp->bio_cflags = G_RAID_BIO_FLAG_REMAP; 1081 cbp->bio_caller2 = (void *)mask; 1082 g_destroy_bio(bp); 1083 G_RAID_LOGREQ(2, cbp, 1084 "Attempting bad sector remap on failing drive."); 1085 g_raid_subdisk_iostart(&vol->v_subdisks[disk], cbp); 1086 return; 1087 } 1088 } 1089 if ((mask & (1 << 31)) != 0) { 1090 /* 1091 * We're done with a recovery, mark the range as unlocked. 1092 * For any write errors, we agressively fail the disk since 1093 * there was both a READ and a WRITE error at this location. 1094 * Both types of errors generally indicates the drive is on 1095 * the verge of total failure anyway. Better to stop trusting 1096 * it now. However, we need to reset error to 0 in that case 1097 * because we're not failing the original I/O which succeeded. 1098 */ 1099 1100 /* Restore what we were doing. */ 1101 P2V(vol, sd->sd_pos, bp->bio_offset, &virtual, ©); 1102 V2P(vol, virtual, &disk, &offset, &start); 1103 1104 for (copy = 0; copy < N; copy++) { 1105 if ((mask & (1 << copy) ) != 0) 1106 vol->v_subdisks[(disk + copy) % 1107 vol->v_disks_count].sd_recovery--; 1108 } 1109 1110 if (bp->bio_cmd == BIO_WRITE && bp->bio_error) { 1111 G_RAID_LOGREQ(0, bp, "Remap write failed: " 1112 "failing subdisk."); 1113 g_raid_tr_raid1e_fail_disk(sd->sd_softc, sd, sd->sd_disk); 1114 bp->bio_error = 0; 1115 } 1116 G_RAID_LOGREQ(2, bp, "REMAP done %d.", bp->bio_error); 1117 g_raid_unlock_range(sd->sd_volume, virtual, bp->bio_length); 1118 } 1119 if (pbp->bio_cmd != BIO_READ) { 1120 if (pbp->bio_inbed == 1 || pbp->bio_error != 0) 1121 pbp->bio_error = bp->bio_error; 1122 if (pbp->bio_cmd == BIO_WRITE && bp->bio_error != 0) { 1123 G_RAID_LOGREQ(0, bp, "Write failed: failing subdisk."); 1124 g_raid_tr_raid1e_fail_disk(sd->sd_softc, sd, sd->sd_disk); 1125 } 1126 error = pbp->bio_error; 1127 } else 1128 error = bp->bio_error; 1129 g_destroy_bio(bp); 1130 if (pbp->bio_children == pbp->bio_inbed) { 1131 pbp->bio_completed = pbp->bio_length; 1132 g_raid_iodone(pbp, error); 1133 } 1134 } 1135 1136 static int 1137 g_raid_tr_kerneldump_raid1e(struct g_raid_tr_object *tr, 1138 void *virtual, vm_offset_t physical, off_t boffset, size_t blength) 1139 { 1140 struct g_raid_volume *vol; 1141 struct g_raid_subdisk *sd; 1142 struct bio_queue_head queue; 1143 char *addr; 1144 off_t offset, start, length, remain; 1145 u_int no, strip_size; 1146 int i, error; 1147 1148 vol = tr->tro_volume; 1149 addr = virtual; 1150 strip_size = vol->v_strip_size; 1151 V2P(vol, boffset, &no, &offset, &start); 1152 remain = blength; 1153 bioq_init(&queue); 1154 while (remain > 0) { 1155 length = MIN(strip_size - start, remain); 1156 for (i = 0; i < N; i++) { 1157 sd = &vol->v_subdisks[no]; 1158 switch (sd->sd_state) { 1159 case G_RAID_SUBDISK_S_ACTIVE: 1160 case G_RAID_SUBDISK_S_STALE: 1161 case G_RAID_SUBDISK_S_RESYNC: 1162 break; 1163 case G_RAID_SUBDISK_S_REBUILD: 1164 if (offset + start >= sd->sd_rebuild_pos) 1165 goto nextdisk; 1166 break; 1167 default: 1168 goto nextdisk; 1169 } 1170 error = g_raid_subdisk_kerneldump(sd, 1171 addr, 0, offset + start, length); 1172 if (error != 0) 1173 return (error); 1174 nextdisk: 1175 if (++no >= vol->v_disks_count) { 1176 no = 0; 1177 offset += strip_size; 1178 } 1179 } 1180 remain -= length; 1181 addr += length; 1182 start = 0; 1183 } 1184 return (0); 1185 } 1186 1187 static int 1188 g_raid_tr_locked_raid1e(struct g_raid_tr_object *tr, void *argp) 1189 { 1190 struct bio *bp; 1191 struct g_raid_subdisk *sd; 1192 1193 bp = (struct bio *)argp; 1194 sd = (struct g_raid_subdisk *)bp->bio_caller1; 1195 g_raid_subdisk_iostart(sd, bp); 1196 1197 return (0); 1198 } 1199 1200 static int 1201 g_raid_tr_idle_raid1e(struct g_raid_tr_object *tr) 1202 { 1203 struct g_raid_tr_raid1e_object *trs; 1204 struct g_raid_volume *vol; 1205 1206 vol = tr->tro_volume; 1207 trs = (struct g_raid_tr_raid1e_object *)tr; 1208 trs->trso_fair_io = g_raid1e_rebuild_fair_io; 1209 trs->trso_recover_slabs = g_raid1e_rebuild_cluster_idle; 1210 /* Compensate short rebuild I/Os. */ 1211 if ((vol->v_disks_count % N) != 0 && 1212 vol->v_strip_size < g_raid1e_rebuild_slab) { 1213 trs->trso_recover_slabs *= g_raid1e_rebuild_slab; 1214 trs->trso_recover_slabs /= vol->v_strip_size; 1215 } 1216 if (trs->trso_type == TR_RAID1E_REBUILD) 1217 g_raid_tr_raid1e_rebuild_some(tr); 1218 return (0); 1219 } 1220 1221 static int 1222 g_raid_tr_free_raid1e(struct g_raid_tr_object *tr) 1223 { 1224 struct g_raid_tr_raid1e_object *trs; 1225 1226 trs = (struct g_raid_tr_raid1e_object *)tr; 1227 1228 if (trs->trso_buffer != NULL) { 1229 free(trs->trso_buffer, M_TR_RAID1E); 1230 trs->trso_buffer = NULL; 1231 } 1232 return (0); 1233 } 1234 1235 G_RAID_TR_DECLARE(raid1e, "RAID1E");
Cache object: b2a3eda45d3c5422df207f39d2c646ec
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