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/9.0/sys/geom/raid/tr_raid1e.c 220210 2011-03-31 16:19:53Z 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); 48 SYSCTL_NODE(_kern_geom_raid, OID_AUTO, raid1e, CTLFLAG_RW, 0, 49 "RAID1E parameters"); 50 51 #define RAID1E_REBUILD_SLAB (1 << 20) /* One transation in a rebuild */ 52 static int g_raid1e_rebuild_slab = RAID1E_REBUILD_SLAB; 53 TUNABLE_INT("kern.geom.raid.raid1e.rebuild_slab_size", 54 &g_raid1e_rebuild_slab); 55 SYSCTL_UINT(_kern_geom_raid_raid1e, OID_AUTO, rebuild_slab_size, CTLFLAG_RW, 56 &g_raid1e_rebuild_slab, 0, 57 "Amount of the disk to rebuild each read/write cycle of the rebuild."); 58 59 #define RAID1E_REBUILD_FAIR_IO 20 /* use 1/x of the available I/O */ 60 static int g_raid1e_rebuild_fair_io = RAID1E_REBUILD_FAIR_IO; 61 TUNABLE_INT("kern.geom.raid.raid1e.rebuild_fair_io", 62 &g_raid1e_rebuild_fair_io); 63 SYSCTL_UINT(_kern_geom_raid_raid1e, OID_AUTO, rebuild_fair_io, CTLFLAG_RW, 64 &g_raid1e_rebuild_fair_io, 0, 65 "Fraction of the I/O bandwidth to use when disk busy for rebuild."); 66 67 #define RAID1E_REBUILD_CLUSTER_IDLE 100 68 static int g_raid1e_rebuild_cluster_idle = RAID1E_REBUILD_CLUSTER_IDLE; 69 TUNABLE_INT("kern.geom.raid.raid1e.rebuild_cluster_idle", 70 &g_raid1e_rebuild_cluster_idle); 71 SYSCTL_UINT(_kern_geom_raid_raid1e, OID_AUTO, rebuild_cluster_idle, CTLFLAG_RW, 72 &g_raid1e_rebuild_cluster_idle, 0, 73 "Number of slabs to do each time we trigger a rebuild cycle"); 74 75 #define RAID1E_REBUILD_META_UPDATE 1024 /* update meta data every 1GB or so */ 76 static int g_raid1e_rebuild_meta_update = RAID1E_REBUILD_META_UPDATE; 77 TUNABLE_INT("kern.geom.raid.raid1e.rebuild_meta_update", 78 &g_raid1e_rebuild_meta_update); 79 SYSCTL_UINT(_kern_geom_raid_raid1e, OID_AUTO, rebuild_meta_update, CTLFLAG_RW, 80 &g_raid1e_rebuild_meta_update, 0, 81 "When to update the meta data."); 82 83 static MALLOC_DEFINE(M_TR_RAID1E, "tr_raid1e_data", "GEOM_RAID RAID1E data"); 84 85 #define TR_RAID1E_NONE 0 86 #define TR_RAID1E_REBUILD 1 87 #define TR_RAID1E_RESYNC 2 88 89 #define TR_RAID1E_F_DOING_SOME 0x1 90 #define TR_RAID1E_F_LOCKED 0x2 91 #define TR_RAID1E_F_ABORT 0x4 92 93 struct g_raid_tr_raid1e_object { 94 struct g_raid_tr_object trso_base; 95 int trso_starting; 96 int trso_stopping; 97 int trso_type; 98 int trso_recover_slabs; /* slabs before rest */ 99 int trso_fair_io; 100 int trso_meta_update; 101 int trso_flags; 102 struct g_raid_subdisk *trso_failed_sd; /* like per volume */ 103 void *trso_buffer; /* Buffer space */ 104 off_t trso_lock_pos; /* Locked range start. */ 105 off_t trso_lock_len; /* Locked range length. */ 106 struct bio trso_bio; 107 }; 108 109 static g_raid_tr_taste_t g_raid_tr_taste_raid1e; 110 static g_raid_tr_event_t g_raid_tr_event_raid1e; 111 static g_raid_tr_start_t g_raid_tr_start_raid1e; 112 static g_raid_tr_stop_t g_raid_tr_stop_raid1e; 113 static g_raid_tr_iostart_t g_raid_tr_iostart_raid1e; 114 static g_raid_tr_iodone_t g_raid_tr_iodone_raid1e; 115 static g_raid_tr_kerneldump_t g_raid_tr_kerneldump_raid1e; 116 static g_raid_tr_locked_t g_raid_tr_locked_raid1e; 117 static g_raid_tr_idle_t g_raid_tr_idle_raid1e; 118 static g_raid_tr_free_t g_raid_tr_free_raid1e; 119 120 static kobj_method_t g_raid_tr_raid1e_methods[] = { 121 KOBJMETHOD(g_raid_tr_taste, g_raid_tr_taste_raid1e), 122 KOBJMETHOD(g_raid_tr_event, g_raid_tr_event_raid1e), 123 KOBJMETHOD(g_raid_tr_start, g_raid_tr_start_raid1e), 124 KOBJMETHOD(g_raid_tr_stop, g_raid_tr_stop_raid1e), 125 KOBJMETHOD(g_raid_tr_iostart, g_raid_tr_iostart_raid1e), 126 KOBJMETHOD(g_raid_tr_iodone, g_raid_tr_iodone_raid1e), 127 KOBJMETHOD(g_raid_tr_kerneldump, g_raid_tr_kerneldump_raid1e), 128 KOBJMETHOD(g_raid_tr_locked, g_raid_tr_locked_raid1e), 129 KOBJMETHOD(g_raid_tr_idle, g_raid_tr_idle_raid1e), 130 KOBJMETHOD(g_raid_tr_free, g_raid_tr_free_raid1e), 131 { 0, 0 } 132 }; 133 134 static struct g_raid_tr_class g_raid_tr_raid1e_class = { 135 "RAID1E", 136 g_raid_tr_raid1e_methods, 137 sizeof(struct g_raid_tr_raid1e_object), 138 .trc_priority = 200 139 }; 140 141 static void g_raid_tr_raid1e_rebuild_abort(struct g_raid_tr_object *tr); 142 static void g_raid_tr_raid1e_maybe_rebuild(struct g_raid_tr_object *tr, 143 struct g_raid_subdisk *sd); 144 static int g_raid_tr_raid1e_select_read_disk(struct g_raid_volume *vol, 145 int no, off_t off, off_t len, u_int mask); 146 147 static inline void 148 V2P(struct g_raid_volume *vol, off_t virt, 149 int *disk, off_t *offset, off_t *start) 150 { 151 off_t nstrip; 152 u_int strip_size; 153 154 strip_size = vol->v_strip_size; 155 /* Strip number. */ 156 nstrip = virt / strip_size; 157 /* Start position in strip. */ 158 *start = virt % strip_size; 159 /* Disk number. */ 160 *disk = (nstrip * N) % vol->v_disks_count; 161 /* Strip start position in disk. */ 162 *offset = ((nstrip * N) / vol->v_disks_count) * strip_size; 163 } 164 165 static inline void 166 P2V(struct g_raid_volume *vol, int disk, off_t offset, 167 off_t *virt, int *copy) 168 { 169 off_t nstrip, start; 170 u_int strip_size; 171 172 strip_size = vol->v_strip_size; 173 /* Start position in strip. */ 174 start = offset % strip_size; 175 /* Physical strip number. */ 176 nstrip = (offset / strip_size) * vol->v_disks_count + disk; 177 /* Number of physical strip (copy) inside virtual strip. */ 178 *copy = nstrip % N; 179 /* Offset in virtual space. */ 180 *virt = (nstrip / N) * strip_size + start; 181 } 182 183 static int 184 g_raid_tr_taste_raid1e(struct g_raid_tr_object *tr, struct g_raid_volume *vol) 185 { 186 struct g_raid_tr_raid1e_object *trs; 187 188 trs = (struct g_raid_tr_raid1e_object *)tr; 189 if (tr->tro_volume->v_raid_level != G_RAID_VOLUME_RL_RAID1E || 190 tr->tro_volume->v_raid_level_qualifier != G_RAID_VOLUME_RLQ_NONE) 191 return (G_RAID_TR_TASTE_FAIL); 192 trs->trso_starting = 1; 193 return (G_RAID_TR_TASTE_SUCCEED); 194 } 195 196 static int 197 g_raid_tr_update_state_raid1e_even(struct g_raid_volume *vol) 198 { 199 struct g_raid_softc *sc; 200 struct g_raid_subdisk *sd, *bestsd, *worstsd; 201 int i, j, state, sstate; 202 203 sc = vol->v_softc; 204 state = G_RAID_VOLUME_S_OPTIMAL; 205 for (i = 0; i < vol->v_disks_count / N; i++) { 206 bestsd = &vol->v_subdisks[i * N]; 207 for (j = 1; j < N; j++) { 208 sd = &vol->v_subdisks[i * N + j]; 209 if (sd->sd_state > bestsd->sd_state) 210 bestsd = sd; 211 else if (sd->sd_state == bestsd->sd_state && 212 (sd->sd_state == G_RAID_SUBDISK_S_REBUILD || 213 sd->sd_state == G_RAID_SUBDISK_S_RESYNC) && 214 sd->sd_rebuild_pos > bestsd->sd_rebuild_pos) 215 bestsd = sd; 216 } 217 if (bestsd->sd_state >= G_RAID_SUBDISK_S_UNINITIALIZED && 218 bestsd->sd_state != G_RAID_SUBDISK_S_ACTIVE) { 219 /* We found reasonable candidate. */ 220 G_RAID_DEBUG1(1, sc, 221 "Promote subdisk %s:%d from %s to ACTIVE.", 222 vol->v_name, bestsd->sd_pos, 223 g_raid_subdisk_state2str(bestsd->sd_state)); 224 g_raid_change_subdisk_state(bestsd, 225 G_RAID_SUBDISK_S_ACTIVE); 226 g_raid_write_metadata(sc, 227 vol, bestsd, bestsd->sd_disk); 228 } 229 worstsd = &vol->v_subdisks[i * N]; 230 for (j = 1; j < N; j++) { 231 sd = &vol->v_subdisks[i * N + j]; 232 if (sd->sd_state < worstsd->sd_state) 233 worstsd = sd; 234 } 235 if (worstsd->sd_state == G_RAID_SUBDISK_S_ACTIVE) 236 sstate = G_RAID_VOLUME_S_OPTIMAL; 237 else if (worstsd->sd_state >= G_RAID_SUBDISK_S_STALE) 238 sstate = G_RAID_VOLUME_S_SUBOPTIMAL; 239 else if (bestsd->sd_state == G_RAID_SUBDISK_S_ACTIVE) 240 sstate = G_RAID_VOLUME_S_DEGRADED; 241 else 242 sstate = G_RAID_VOLUME_S_BROKEN; 243 if (sstate < state) 244 state = sstate; 245 } 246 return (state); 247 } 248 249 static int 250 g_raid_tr_update_state_raid1e_odd(struct g_raid_volume *vol) 251 { 252 struct g_raid_softc *sc; 253 struct g_raid_subdisk *sd, *bestsd, *worstsd; 254 int i, j, state, sstate; 255 256 sc = vol->v_softc; 257 if (g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_ACTIVE) == 258 vol->v_disks_count) 259 return (G_RAID_VOLUME_S_OPTIMAL); 260 for (i = 0; i < vol->v_disks_count; i++) { 261 sd = &vol->v_subdisks[i]; 262 if (sd->sd_state == G_RAID_SUBDISK_S_UNINITIALIZED) { 263 /* We found reasonable candidate. */ 264 G_RAID_DEBUG1(1, sc, 265 "Promote subdisk %s:%d from %s to STALE.", 266 vol->v_name, sd->sd_pos, 267 g_raid_subdisk_state2str(sd->sd_state)); 268 g_raid_change_subdisk_state(sd, 269 G_RAID_SUBDISK_S_STALE); 270 g_raid_write_metadata(sc, vol, sd, sd->sd_disk); 271 } 272 } 273 state = G_RAID_VOLUME_S_OPTIMAL; 274 for (i = 0; i < vol->v_disks_count; i++) { 275 bestsd = &vol->v_subdisks[i]; 276 worstsd = &vol->v_subdisks[i]; 277 for (j = 1; j < N; j++) { 278 sd = &vol->v_subdisks[(i + j) % vol->v_disks_count]; 279 if (sd->sd_state > bestsd->sd_state) 280 bestsd = sd; 281 else if (sd->sd_state == bestsd->sd_state && 282 (sd->sd_state == G_RAID_SUBDISK_S_REBUILD || 283 sd->sd_state == G_RAID_SUBDISK_S_RESYNC) && 284 sd->sd_rebuild_pos > bestsd->sd_rebuild_pos) 285 bestsd = sd; 286 if (sd->sd_state < worstsd->sd_state) 287 worstsd = sd; 288 } 289 if (worstsd->sd_state == G_RAID_SUBDISK_S_ACTIVE) 290 sstate = G_RAID_VOLUME_S_OPTIMAL; 291 else if (worstsd->sd_state >= G_RAID_SUBDISK_S_STALE) 292 sstate = G_RAID_VOLUME_S_SUBOPTIMAL; 293 else if (bestsd->sd_state >= G_RAID_SUBDISK_S_STALE) 294 sstate = G_RAID_VOLUME_S_DEGRADED; 295 else 296 sstate = G_RAID_VOLUME_S_BROKEN; 297 if (sstate < state) 298 state = sstate; 299 } 300 return (state); 301 } 302 303 static int 304 g_raid_tr_update_state_raid1e(struct g_raid_volume *vol, 305 struct g_raid_subdisk *sd) 306 { 307 struct g_raid_tr_raid1e_object *trs; 308 struct g_raid_softc *sc; 309 u_int s; 310 311 sc = vol->v_softc; 312 trs = (struct g_raid_tr_raid1e_object *)vol->v_tr; 313 if (trs->trso_stopping && 314 (trs->trso_flags & TR_RAID1E_F_DOING_SOME) == 0) 315 s = G_RAID_VOLUME_S_STOPPED; 316 else if (trs->trso_starting) 317 s = G_RAID_VOLUME_S_STARTING; 318 else { 319 if ((vol->v_disks_count % N) == 0) 320 s = g_raid_tr_update_state_raid1e_even(vol); 321 else 322 s = g_raid_tr_update_state_raid1e_odd(vol); 323 } 324 if (s != vol->v_state) { 325 g_raid_event_send(vol, G_RAID_VOLUME_S_ALIVE(s) ? 326 G_RAID_VOLUME_E_UP : G_RAID_VOLUME_E_DOWN, 327 G_RAID_EVENT_VOLUME); 328 g_raid_change_volume_state(vol, s); 329 if (!trs->trso_starting && !trs->trso_stopping) 330 g_raid_write_metadata(sc, vol, NULL, NULL); 331 } 332 if (!trs->trso_starting && !trs->trso_stopping) 333 g_raid_tr_raid1e_maybe_rebuild(vol->v_tr, sd); 334 return (0); 335 } 336 337 static void 338 g_raid_tr_raid1e_fail_disk(struct g_raid_softc *sc, struct g_raid_subdisk *sd, 339 struct g_raid_disk *disk) 340 { 341 /* 342 * We don't fail the last disk in the pack, since it still has decent 343 * data on it and that's better than failing the disk if it is the root 344 * file system. 345 * 346 * XXX should this be controlled via a tunable? It makes sense for 347 * the volume that has / on it. I can't think of a case where we'd 348 * want the volume to go away on this kind of event. 349 */ 350 if (g_raid_nsubdisks(sd->sd_volume, G_RAID_SUBDISK_S_ACTIVE) == 1 && 351 g_raid_get_subdisk(sd->sd_volume, G_RAID_SUBDISK_S_ACTIVE) == sd) 352 return; 353 g_raid_fail_disk(sc, sd, disk); 354 } 355 356 static void 357 g_raid_tr_raid1e_rebuild_done(struct g_raid_tr_raid1e_object *trs) 358 { 359 struct g_raid_volume *vol; 360 struct g_raid_subdisk *sd; 361 362 vol = trs->trso_base.tro_volume; 363 sd = trs->trso_failed_sd; 364 g_raid_write_metadata(vol->v_softc, vol, sd, sd->sd_disk); 365 free(trs->trso_buffer, M_TR_RAID1E); 366 trs->trso_buffer = NULL; 367 trs->trso_flags &= ~TR_RAID1E_F_DOING_SOME; 368 trs->trso_type = TR_RAID1E_NONE; 369 trs->trso_recover_slabs = 0; 370 trs->trso_failed_sd = NULL; 371 g_raid_tr_update_state_raid1e(vol, NULL); 372 } 373 374 static void 375 g_raid_tr_raid1e_rebuild_finish(struct g_raid_tr_object *tr) 376 { 377 struct g_raid_tr_raid1e_object *trs; 378 struct g_raid_subdisk *sd; 379 380 trs = (struct g_raid_tr_raid1e_object *)tr; 381 sd = trs->trso_failed_sd; 382 G_RAID_DEBUG1(0, tr->tro_volume->v_softc, 383 "Subdisk %s:%d-%s rebuild completed.", 384 sd->sd_volume->v_name, sd->sd_pos, 385 sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]"); 386 g_raid_change_subdisk_state(sd, G_RAID_SUBDISK_S_ACTIVE); 387 sd->sd_rebuild_pos = 0; 388 g_raid_tr_raid1e_rebuild_done(trs); 389 } 390 391 static void 392 g_raid_tr_raid1e_rebuild_abort(struct g_raid_tr_object *tr) 393 { 394 struct g_raid_tr_raid1e_object *trs; 395 struct g_raid_subdisk *sd; 396 struct g_raid_volume *vol; 397 398 vol = tr->tro_volume; 399 trs = (struct g_raid_tr_raid1e_object *)tr; 400 sd = trs->trso_failed_sd; 401 if (trs->trso_flags & TR_RAID1E_F_DOING_SOME) { 402 G_RAID_DEBUG1(1, vol->v_softc, 403 "Subdisk %s:%d-%s rebuild is aborting.", 404 sd->sd_volume->v_name, sd->sd_pos, 405 sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]"); 406 trs->trso_flags |= TR_RAID1E_F_ABORT; 407 } else { 408 G_RAID_DEBUG1(0, vol->v_softc, 409 "Subdisk %s:%d-%s rebuild aborted.", 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 if (trs->trso_flags & TR_RAID1E_F_LOCKED) { 414 trs->trso_flags &= ~TR_RAID1E_F_LOCKED; 415 g_raid_unlock_range(tr->tro_volume, 416 trs->trso_lock_pos, trs->trso_lock_len); 417 } 418 g_raid_tr_raid1e_rebuild_done(trs); 419 } 420 } 421 422 static void 423 g_raid_tr_raid1e_rebuild_some(struct g_raid_tr_object *tr) 424 { 425 struct g_raid_tr_raid1e_object *trs; 426 struct g_raid_softc *sc; 427 struct g_raid_volume *vol; 428 struct g_raid_subdisk *sd; 429 struct bio *bp; 430 off_t len, virtual, vend, offset, start; 431 int disk, copy, best; 432 433 trs = (struct g_raid_tr_raid1e_object *)tr; 434 if (trs->trso_flags & TR_RAID1E_F_DOING_SOME) 435 return; 436 vol = tr->tro_volume; 437 sc = vol->v_softc; 438 sd = trs->trso_failed_sd; 439 440 while (1) { 441 if (sd->sd_rebuild_pos >= sd->sd_size) { 442 g_raid_tr_raid1e_rebuild_finish(tr); 443 return; 444 } 445 /* Get virtual offset from physical rebuild position. */ 446 P2V(vol, sd->sd_pos, sd->sd_rebuild_pos, &virtual, ©); 447 /* Get physical offset back to get first stripe position. */ 448 V2P(vol, virtual, &disk, &offset, &start); 449 /* Calculate contignous data length. */ 450 len = MIN(g_raid1e_rebuild_slab, 451 sd->sd_size - sd->sd_rebuild_pos); 452 if ((vol->v_disks_count % N) != 0) 453 len = MIN(len, vol->v_strip_size - start); 454 /* Find disk with most accurate data. */ 455 best = g_raid_tr_raid1e_select_read_disk(vol, disk, 456 offset + start, len, 0); 457 if (best < 0) { 458 /* There is no any valid disk. */ 459 g_raid_tr_raid1e_rebuild_abort(tr); 460 return; 461 } else if (best != copy) { 462 /* Some other disk has better data. */ 463 break; 464 } 465 /* We have the most accurate data. Skip the range. */ 466 G_RAID_DEBUG1(3, sc, "Skipping rebuild for range %ju - %ju", 467 sd->sd_rebuild_pos, sd->sd_rebuild_pos + len); 468 sd->sd_rebuild_pos += len; 469 } 470 471 bp = &trs->trso_bio; 472 memset(bp, 0, sizeof(*bp)); 473 bp->bio_offset = offset + start + 474 ((disk + best >= vol->v_disks_count) ? vol->v_strip_size : 0); 475 bp->bio_length = len; 476 bp->bio_data = trs->trso_buffer; 477 bp->bio_cmd = BIO_READ; 478 bp->bio_cflags = G_RAID_BIO_FLAG_SYNC; 479 bp->bio_caller1 = &vol->v_subdisks[(disk + best) % vol->v_disks_count]; 480 G_RAID_LOGREQ(3, bp, "Queueing rebuild read"); 481 /* 482 * If we are crossing stripe boundary, correct affected virtual 483 * range we should lock. 484 */ 485 if (start + len > vol->v_strip_size) { 486 P2V(vol, sd->sd_pos, sd->sd_rebuild_pos + len, &vend, ©); 487 len = vend - virtual; 488 } 489 trs->trso_flags |= TR_RAID1E_F_DOING_SOME; 490 trs->trso_flags |= TR_RAID1E_F_LOCKED; 491 trs->trso_lock_pos = virtual; 492 trs->trso_lock_len = len; 493 /* Lock callback starts I/O */ 494 g_raid_lock_range(sd->sd_volume, virtual, len, NULL, bp); 495 } 496 497 static void 498 g_raid_tr_raid1e_rebuild_start(struct g_raid_tr_object *tr) 499 { 500 struct g_raid_volume *vol; 501 struct g_raid_tr_raid1e_object *trs; 502 struct g_raid_subdisk *sd; 503 504 vol = tr->tro_volume; 505 trs = (struct g_raid_tr_raid1e_object *)tr; 506 if (trs->trso_failed_sd) { 507 G_RAID_DEBUG1(1, vol->v_softc, 508 "Already rebuild in start rebuild. pos %jd\n", 509 (intmax_t)trs->trso_failed_sd->sd_rebuild_pos); 510 return; 511 } 512 sd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_RESYNC); 513 if (sd == NULL) 514 sd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_REBUILD); 515 if (sd == NULL) { 516 sd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_STALE); 517 if (sd != NULL) { 518 sd->sd_rebuild_pos = 0; 519 g_raid_change_subdisk_state(sd, 520 G_RAID_SUBDISK_S_RESYNC); 521 g_raid_write_metadata(vol->v_softc, vol, sd, NULL); 522 } else { 523 sd = g_raid_get_subdisk(vol, 524 G_RAID_SUBDISK_S_UNINITIALIZED); 525 if (sd == NULL) 526 sd = g_raid_get_subdisk(vol, 527 G_RAID_SUBDISK_S_NEW); 528 if (sd != NULL) { 529 sd->sd_rebuild_pos = 0; 530 g_raid_change_subdisk_state(sd, 531 G_RAID_SUBDISK_S_REBUILD); 532 g_raid_write_metadata(vol->v_softc, 533 vol, sd, NULL); 534 } 535 } 536 } 537 if (sd == NULL) { 538 G_RAID_DEBUG1(1, vol->v_softc, 539 "No failed disk to rebuild. night night."); 540 return; 541 } 542 trs->trso_failed_sd = sd; 543 G_RAID_DEBUG1(0, vol->v_softc, 544 "Subdisk %s:%d-%s rebuild start at %jd.", 545 sd->sd_volume->v_name, sd->sd_pos, 546 sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]", 547 trs->trso_failed_sd->sd_rebuild_pos); 548 trs->trso_type = TR_RAID1E_REBUILD; 549 trs->trso_buffer = malloc(g_raid1e_rebuild_slab, M_TR_RAID1E, M_WAITOK); 550 trs->trso_meta_update = g_raid1e_rebuild_meta_update; 551 g_raid_tr_raid1e_rebuild_some(tr); 552 } 553 554 static void 555 g_raid_tr_raid1e_maybe_rebuild(struct g_raid_tr_object *tr, 556 struct g_raid_subdisk *sd) 557 { 558 struct g_raid_volume *vol; 559 struct g_raid_tr_raid1e_object *trs; 560 int nr; 561 562 vol = tr->tro_volume; 563 trs = (struct g_raid_tr_raid1e_object *)tr; 564 if (trs->trso_stopping) 565 return; 566 nr = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_REBUILD) + 567 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_RESYNC); 568 switch(trs->trso_type) { 569 case TR_RAID1E_NONE: 570 if (vol->v_state < G_RAID_VOLUME_S_DEGRADED) 571 return; 572 if (nr == 0) { 573 nr = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_NEW) + 574 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_STALE) + 575 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_UNINITIALIZED); 576 if (nr == 0) 577 return; 578 } 579 g_raid_tr_raid1e_rebuild_start(tr); 580 break; 581 case TR_RAID1E_REBUILD: 582 if (vol->v_state < G_RAID_VOLUME_S_DEGRADED || nr == 0 || 583 trs->trso_failed_sd == sd) 584 g_raid_tr_raid1e_rebuild_abort(tr); 585 break; 586 case TR_RAID1E_RESYNC: 587 break; 588 } 589 } 590 591 static int 592 g_raid_tr_event_raid1e(struct g_raid_tr_object *tr, 593 struct g_raid_subdisk *sd, u_int event) 594 { 595 596 g_raid_tr_update_state_raid1e(tr->tro_volume, sd); 597 return (0); 598 } 599 600 static int 601 g_raid_tr_start_raid1e(struct g_raid_tr_object *tr) 602 { 603 struct g_raid_tr_raid1e_object *trs; 604 struct g_raid_volume *vol; 605 606 trs = (struct g_raid_tr_raid1e_object *)tr; 607 vol = tr->tro_volume; 608 trs->trso_starting = 0; 609 g_raid_tr_update_state_raid1e(vol, NULL); 610 return (0); 611 } 612 613 static int 614 g_raid_tr_stop_raid1e(struct g_raid_tr_object *tr) 615 { 616 struct g_raid_tr_raid1e_object *trs; 617 struct g_raid_volume *vol; 618 619 trs = (struct g_raid_tr_raid1e_object *)tr; 620 vol = tr->tro_volume; 621 trs->trso_starting = 0; 622 trs->trso_stopping = 1; 623 g_raid_tr_update_state_raid1e(vol, NULL); 624 return (0); 625 } 626 627 /* 628 * Select the disk to read from. Take into account: subdisk state, running 629 * error recovery, average disk load, head position and possible cache hits. 630 */ 631 #define ABS(x) (((x) >= 0) ? (x) : (-(x))) 632 static int 633 g_raid_tr_raid1e_select_read_disk(struct g_raid_volume *vol, 634 int no, off_t off, off_t len, u_int mask) 635 { 636 struct g_raid_subdisk *sd; 637 off_t offset; 638 int i, best, prio, bestprio; 639 640 best = -1; 641 bestprio = INT_MAX; 642 for (i = 0; i < N; i++) { 643 sd = &vol->v_subdisks[(no + i) % vol->v_disks_count]; 644 offset = off; 645 if (no + i >= vol->v_disks_count) 646 offset += vol->v_strip_size; 647 648 prio = G_RAID_SUBDISK_LOAD(sd); 649 if ((mask & (1 << sd->sd_pos)) != 0) 650 continue; 651 switch (sd->sd_state) { 652 case G_RAID_SUBDISK_S_ACTIVE: 653 break; 654 case G_RAID_SUBDISK_S_RESYNC: 655 if (offset + off < sd->sd_rebuild_pos) 656 break; 657 /* FALLTHROUGH */ 658 case G_RAID_SUBDISK_S_STALE: 659 prio += i << 24; 660 break; 661 case G_RAID_SUBDISK_S_REBUILD: 662 if (offset + off < sd->sd_rebuild_pos) 663 break; 664 /* FALLTHROUGH */ 665 default: 666 continue; 667 } 668 prio += min(sd->sd_recovery, 255) << 16; 669 /* If disk head is precisely in position - highly prefer it. */ 670 if (G_RAID_SUBDISK_POS(sd) == offset) 671 prio -= 2 * G_RAID_SUBDISK_LOAD_SCALE; 672 else 673 /* If disk head is close to position - prefer it. */ 674 if (ABS(G_RAID_SUBDISK_POS(sd) - offset) < 675 G_RAID_SUBDISK_TRACK_SIZE) 676 prio -= 1 * G_RAID_SUBDISK_LOAD_SCALE; 677 if (prio < bestprio) { 678 bestprio = prio; 679 best = i; 680 } 681 } 682 return (best); 683 } 684 685 static void 686 g_raid_tr_iostart_raid1e_read(struct g_raid_tr_object *tr, struct bio *bp) 687 { 688 struct g_raid_volume *vol; 689 struct g_raid_subdisk *sd; 690 struct bio_queue_head queue; 691 struct bio *cbp; 692 char *addr; 693 off_t offset, start, length, remain; 694 u_int no, strip_size; 695 int best; 696 697 vol = tr->tro_volume; 698 addr = bp->bio_data; 699 strip_size = vol->v_strip_size; 700 V2P(vol, bp->bio_offset, &no, &offset, &start); 701 remain = bp->bio_length; 702 bioq_init(&queue); 703 while (remain > 0) { 704 length = MIN(strip_size - start, remain); 705 best = g_raid_tr_raid1e_select_read_disk(vol, 706 no, offset, length, 0); 707 KASSERT(best >= 0, ("No readable disk in volume %s!", 708 vol->v_name)); 709 no += best; 710 if (no >= vol->v_disks_count) { 711 no -= vol->v_disks_count; 712 offset += strip_size; 713 } 714 cbp = g_clone_bio(bp); 715 if (cbp == NULL) 716 goto failure; 717 cbp->bio_offset = offset + start; 718 cbp->bio_data = addr; 719 cbp->bio_length = length; 720 cbp->bio_caller1 = &vol->v_subdisks[no]; 721 bioq_insert_tail(&queue, cbp); 722 no += N - best; 723 if (no >= vol->v_disks_count) { 724 no -= vol->v_disks_count; 725 offset += strip_size; 726 } 727 remain -= length; 728 addr += length; 729 start = 0; 730 } 731 for (cbp = bioq_first(&queue); cbp != NULL; 732 cbp = bioq_first(&queue)) { 733 bioq_remove(&queue, cbp); 734 sd = cbp->bio_caller1; 735 cbp->bio_caller1 = NULL; 736 g_raid_subdisk_iostart(sd, cbp); 737 } 738 return; 739 failure: 740 for (cbp = bioq_first(&queue); cbp != NULL; 741 cbp = bioq_first(&queue)) { 742 bioq_remove(&queue, cbp); 743 g_destroy_bio(cbp); 744 } 745 if (bp->bio_error == 0) 746 bp->bio_error = ENOMEM; 747 g_raid_iodone(bp, bp->bio_error); 748 } 749 750 static void 751 g_raid_tr_iostart_raid1e_write(struct g_raid_tr_object *tr, struct bio *bp) 752 { 753 struct g_raid_volume *vol; 754 struct g_raid_subdisk *sd; 755 struct bio_queue_head queue; 756 struct bio *cbp; 757 char *addr; 758 off_t offset, start, length, remain; 759 u_int no, strip_size; 760 int i; 761 762 vol = tr->tro_volume; 763 addr = bp->bio_data; 764 strip_size = vol->v_strip_size; 765 V2P(vol, bp->bio_offset, &no, &offset, &start); 766 remain = bp->bio_length; 767 bioq_init(&queue); 768 while (remain > 0) { 769 length = MIN(strip_size - start, remain); 770 for (i = 0; i < N; i++) { 771 sd = &vol->v_subdisks[no]; 772 switch (sd->sd_state) { 773 case G_RAID_SUBDISK_S_ACTIVE: 774 case G_RAID_SUBDISK_S_STALE: 775 case G_RAID_SUBDISK_S_RESYNC: 776 break; 777 case G_RAID_SUBDISK_S_REBUILD: 778 if (offset + start >= sd->sd_rebuild_pos) 779 goto nextdisk; 780 break; 781 default: 782 goto nextdisk; 783 } 784 cbp = g_clone_bio(bp); 785 if (cbp == NULL) 786 goto failure; 787 cbp->bio_offset = offset + start; 788 cbp->bio_data = addr; 789 cbp->bio_length = length; 790 cbp->bio_caller1 = sd; 791 bioq_insert_tail(&queue, cbp); 792 nextdisk: 793 if (++no >= vol->v_disks_count) { 794 no = 0; 795 offset += strip_size; 796 } 797 } 798 remain -= length; 799 addr += length; 800 start = 0; 801 } 802 for (cbp = bioq_first(&queue); cbp != NULL; 803 cbp = bioq_first(&queue)) { 804 bioq_remove(&queue, cbp); 805 sd = cbp->bio_caller1; 806 cbp->bio_caller1 = NULL; 807 g_raid_subdisk_iostart(sd, cbp); 808 } 809 return; 810 failure: 811 for (cbp = bioq_first(&queue); cbp != NULL; 812 cbp = bioq_first(&queue)) { 813 bioq_remove(&queue, cbp); 814 g_destroy_bio(cbp); 815 } 816 if (bp->bio_error == 0) 817 bp->bio_error = ENOMEM; 818 g_raid_iodone(bp, bp->bio_error); 819 } 820 821 static void 822 g_raid_tr_iostart_raid1e(struct g_raid_tr_object *tr, struct bio *bp) 823 { 824 struct g_raid_volume *vol; 825 struct g_raid_tr_raid1e_object *trs; 826 827 vol = tr->tro_volume; 828 trs = (struct g_raid_tr_raid1e_object *)tr; 829 if (vol->v_state != G_RAID_VOLUME_S_OPTIMAL && 830 vol->v_state != G_RAID_VOLUME_S_SUBOPTIMAL && 831 vol->v_state != G_RAID_VOLUME_S_DEGRADED) { 832 g_raid_iodone(bp, EIO); 833 return; 834 } 835 /* 836 * If we're rebuilding, squeeze in rebuild activity every so often, 837 * even when the disk is busy. Be sure to only count real I/O 838 * to the disk. All 'SPECIAL' I/O is traffic generated to the disk 839 * by this module. 840 */ 841 if (trs->trso_failed_sd != NULL && 842 !(bp->bio_cflags & G_RAID_BIO_FLAG_SPECIAL)) { 843 /* Make this new or running now round short. */ 844 trs->trso_recover_slabs = 0; 845 if (--trs->trso_fair_io <= 0) { 846 trs->trso_fair_io = g_raid1e_rebuild_fair_io; 847 g_raid_tr_raid1e_rebuild_some(tr); 848 } 849 } 850 switch (bp->bio_cmd) { 851 case BIO_READ: 852 g_raid_tr_iostart_raid1e_read(tr, bp); 853 break; 854 case BIO_WRITE: 855 g_raid_tr_iostart_raid1e_write(tr, bp); 856 break; 857 case BIO_DELETE: 858 g_raid_iodone(bp, EIO); 859 break; 860 case BIO_FLUSH: 861 g_raid_tr_flush_common(tr, bp); 862 break; 863 default: 864 KASSERT(1 == 0, ("Invalid command here: %u (volume=%s)", 865 bp->bio_cmd, vol->v_name)); 866 break; 867 } 868 } 869 870 static void 871 g_raid_tr_iodone_raid1e(struct g_raid_tr_object *tr, 872 struct g_raid_subdisk *sd, struct bio *bp) 873 { 874 struct bio *cbp; 875 struct g_raid_subdisk *nsd; 876 struct g_raid_volume *vol; 877 struct bio *pbp; 878 struct g_raid_tr_raid1e_object *trs; 879 off_t virtual, offset, start; 880 uintptr_t mask; 881 int error, do_write, copy, disk, best; 882 883 trs = (struct g_raid_tr_raid1e_object *)tr; 884 vol = tr->tro_volume; 885 if (bp->bio_cflags & G_RAID_BIO_FLAG_SYNC) { 886 if (trs->trso_type == TR_RAID1E_REBUILD) { 887 nsd = trs->trso_failed_sd; 888 if (bp->bio_cmd == BIO_READ) { 889 890 /* Immediately abort rebuild, if requested. */ 891 if (trs->trso_flags & TR_RAID1E_F_ABORT) { 892 trs->trso_flags &= ~TR_RAID1E_F_DOING_SOME; 893 g_raid_tr_raid1e_rebuild_abort(tr); 894 return; 895 } 896 897 /* On read error, skip and cross fingers. */ 898 if (bp->bio_error != 0) { 899 G_RAID_LOGREQ(0, bp, 900 "Read error during rebuild (%d), " 901 "possible data loss!", 902 bp->bio_error); 903 goto rebuild_round_done; 904 } 905 906 /* 907 * The read operation finished, queue the 908 * write and get out. 909 */ 910 G_RAID_LOGREQ(3, bp, "Rebuild read done: %d", 911 bp->bio_error); 912 bp->bio_cmd = BIO_WRITE; 913 bp->bio_cflags = G_RAID_BIO_FLAG_SYNC; 914 bp->bio_offset = nsd->sd_rebuild_pos; 915 G_RAID_LOGREQ(3, bp, "Queueing rebuild write."); 916 g_raid_subdisk_iostart(nsd, bp); 917 } else { 918 /* 919 * The write operation just finished. Do 920 * another. We keep cloning the master bio 921 * since it has the right buffers allocated to 922 * it. 923 */ 924 G_RAID_LOGREQ(3, bp, "Rebuild write done: %d", 925 bp->bio_error); 926 if (bp->bio_error != 0 || 927 trs->trso_flags & TR_RAID1E_F_ABORT) { 928 if ((trs->trso_flags & 929 TR_RAID1E_F_ABORT) == 0) { 930 g_raid_tr_raid1e_fail_disk(sd->sd_softc, 931 nsd, nsd->sd_disk); 932 } 933 trs->trso_flags &= ~TR_RAID1E_F_DOING_SOME; 934 g_raid_tr_raid1e_rebuild_abort(tr); 935 return; 936 } 937 rebuild_round_done: 938 trs->trso_flags &= ~TR_RAID1E_F_LOCKED; 939 g_raid_unlock_range(tr->tro_volume, 940 trs->trso_lock_pos, trs->trso_lock_len); 941 nsd->sd_rebuild_pos += bp->bio_length; 942 if (nsd->sd_rebuild_pos >= nsd->sd_size) { 943 g_raid_tr_raid1e_rebuild_finish(tr); 944 return; 945 } 946 947 /* Abort rebuild if we are stopping */ 948 if (trs->trso_stopping) { 949 trs->trso_flags &= ~TR_RAID1E_F_DOING_SOME; 950 g_raid_tr_raid1e_rebuild_abort(tr); 951 return; 952 } 953 954 if (--trs->trso_meta_update <= 0) { 955 g_raid_write_metadata(vol->v_softc, 956 vol, nsd, nsd->sd_disk); 957 trs->trso_meta_update = 958 g_raid1e_rebuild_meta_update; 959 /* Compensate short rebuild I/Os. */ 960 if ((vol->v_disks_count % N) != 0 && 961 vol->v_strip_size < 962 g_raid1e_rebuild_slab) { 963 trs->trso_meta_update *= 964 g_raid1e_rebuild_slab; 965 trs->trso_meta_update /= 966 vol->v_strip_size; 967 } 968 } 969 trs->trso_flags &= ~TR_RAID1E_F_DOING_SOME; 970 if (--trs->trso_recover_slabs <= 0) 971 return; 972 /* Run next rebuild iteration. */ 973 g_raid_tr_raid1e_rebuild_some(tr); 974 } 975 } else if (trs->trso_type == TR_RAID1E_RESYNC) { 976 /* 977 * read good sd, read bad sd in parallel. when both 978 * done, compare the buffers. write good to the bad 979 * if different. do the next bit of work. 980 */ 981 panic("Somehow, we think we're doing a resync"); 982 } 983 return; 984 } 985 pbp = bp->bio_parent; 986 pbp->bio_inbed++; 987 mask = (intptr_t)bp->bio_caller2; 988 if (bp->bio_cmd == BIO_READ && bp->bio_error != 0) { 989 /* 990 * Read failed on first drive. Retry the read error on 991 * another disk drive, if available, before erroring out the 992 * read. 993 */ 994 sd->sd_disk->d_read_errs++; 995 G_RAID_LOGREQ(0, bp, 996 "Read error (%d), %d read errors total", 997 bp->bio_error, sd->sd_disk->d_read_errs); 998 999 /* 1000 * If there are too many read errors, we move to degraded. 1001 * XXX Do we want to FAIL the drive (eg, make the user redo 1002 * everything to get it back in sync), or just degrade the 1003 * drive, which kicks off a resync? 1004 */ 1005 do_write = 0; 1006 if (sd->sd_disk->d_read_errs > g_raid_read_err_thresh) 1007 g_raid_tr_raid1e_fail_disk(sd->sd_softc, sd, sd->sd_disk); 1008 else if (mask == 0) 1009 do_write = 1; 1010 1011 /* Restore what we were doing. */ 1012 P2V(vol, sd->sd_pos, bp->bio_offset, &virtual, ©); 1013 V2P(vol, virtual, &disk, &offset, &start); 1014 1015 /* Find the other disk, and try to do the I/O to it. */ 1016 mask |= 1 << copy; 1017 best = g_raid_tr_raid1e_select_read_disk(vol, 1018 disk, offset, start, mask); 1019 if (best >= 0 && (cbp = g_clone_bio(pbp)) != NULL) { 1020 disk += best; 1021 if (disk >= vol->v_disks_count) { 1022 disk -= vol->v_disks_count; 1023 offset += vol->v_strip_size; 1024 } 1025 cbp->bio_offset = offset + start; 1026 cbp->bio_length = bp->bio_length; 1027 cbp->bio_data = bp->bio_data; 1028 g_destroy_bio(bp); 1029 nsd = &vol->v_subdisks[disk]; 1030 G_RAID_LOGREQ(2, cbp, "Retrying read from %d", 1031 nsd->sd_pos); 1032 if (do_write) 1033 mask |= 1 << 31; 1034 if ((mask & (1 << 31)) != 0) 1035 sd->sd_recovery++; 1036 cbp->bio_caller2 = (void *)mask; 1037 if (do_write) { 1038 cbp->bio_caller1 = nsd; 1039 /* Lock callback starts I/O */ 1040 g_raid_lock_range(sd->sd_volume, 1041 virtual, cbp->bio_length, pbp, cbp); 1042 } else { 1043 g_raid_subdisk_iostart(nsd, cbp); 1044 } 1045 return; 1046 } 1047 /* 1048 * We can't retry. Return the original error by falling 1049 * through. This will happen when there's only one good disk. 1050 * We don't need to fail the raid, since its actual state is 1051 * based on the state of the subdisks. 1052 */ 1053 G_RAID_LOGREQ(2, bp, "Couldn't retry read, failing it"); 1054 } 1055 if (bp->bio_cmd == BIO_READ && 1056 bp->bio_error == 0 && 1057 (mask & (1 << 31)) != 0) { 1058 G_RAID_LOGREQ(3, bp, "Recovered data from other drive"); 1059 1060 /* Restore what we were doing. */ 1061 P2V(vol, sd->sd_pos, bp->bio_offset, &virtual, ©); 1062 V2P(vol, virtual, &disk, &offset, &start); 1063 1064 /* Find best disk to write. */ 1065 best = g_raid_tr_raid1e_select_read_disk(vol, 1066 disk, offset, start, ~mask); 1067 if (best >= 0 && (cbp = g_clone_bio(pbp)) != NULL) { 1068 disk += best; 1069 if (disk >= vol->v_disks_count) { 1070 disk -= vol->v_disks_count; 1071 offset += vol->v_strip_size; 1072 } 1073 cbp->bio_offset = offset + start; 1074 cbp->bio_length = bp->bio_length; 1075 cbp->bio_data = bp->bio_data; 1076 cbp->bio_cmd = BIO_WRITE; 1077 cbp->bio_cflags = G_RAID_BIO_FLAG_REMAP; 1078 cbp->bio_caller2 = (void *)mask; 1079 g_destroy_bio(bp); 1080 G_RAID_LOGREQ(2, cbp, 1081 "Attempting bad sector remap on failing drive."); 1082 g_raid_subdisk_iostart(&vol->v_subdisks[disk], cbp); 1083 return; 1084 } 1085 } 1086 if ((mask & (1 << 31)) != 0) { 1087 /* 1088 * We're done with a recovery, mark the range as unlocked. 1089 * For any write errors, we agressively fail the disk since 1090 * there was both a READ and a WRITE error at this location. 1091 * Both types of errors generally indicates the drive is on 1092 * the verge of total failure anyway. Better to stop trusting 1093 * it now. However, we need to reset error to 0 in that case 1094 * because we're not failing the original I/O which succeeded. 1095 */ 1096 1097 /* Restore what we were doing. */ 1098 P2V(vol, sd->sd_pos, bp->bio_offset, &virtual, ©); 1099 V2P(vol, virtual, &disk, &offset, &start); 1100 1101 for (copy = 0; copy < N; copy++) { 1102 if ((mask & (1 << copy) ) != 0) 1103 vol->v_subdisks[(disk + copy) % 1104 vol->v_disks_count].sd_recovery--; 1105 } 1106 1107 if (bp->bio_cmd == BIO_WRITE && bp->bio_error) { 1108 G_RAID_LOGREQ(0, bp, "Remap write failed: " 1109 "failing subdisk."); 1110 g_raid_tr_raid1e_fail_disk(sd->sd_softc, sd, sd->sd_disk); 1111 bp->bio_error = 0; 1112 } 1113 G_RAID_LOGREQ(2, bp, "REMAP done %d.", bp->bio_error); 1114 g_raid_unlock_range(sd->sd_volume, virtual, bp->bio_length); 1115 } 1116 error = bp->bio_error; 1117 g_destroy_bio(bp); 1118 if (pbp->bio_children == pbp->bio_inbed) { 1119 pbp->bio_completed = pbp->bio_length; 1120 g_raid_iodone(pbp, error); 1121 } 1122 } 1123 1124 static int 1125 g_raid_tr_kerneldump_raid1e(struct g_raid_tr_object *tr, 1126 void *virtual, vm_offset_t physical, off_t boffset, size_t blength) 1127 { 1128 struct g_raid_volume *vol; 1129 struct g_raid_subdisk *sd; 1130 struct bio_queue_head queue; 1131 char *addr; 1132 off_t offset, start, length, remain; 1133 u_int no, strip_size; 1134 int i, error; 1135 1136 vol = tr->tro_volume; 1137 addr = virtual; 1138 strip_size = vol->v_strip_size; 1139 V2P(vol, boffset, &no, &offset, &start); 1140 remain = blength; 1141 bioq_init(&queue); 1142 while (remain > 0) { 1143 length = MIN(strip_size - start, remain); 1144 for (i = 0; i < N; i++) { 1145 sd = &vol->v_subdisks[no]; 1146 switch (sd->sd_state) { 1147 case G_RAID_SUBDISK_S_ACTIVE: 1148 case G_RAID_SUBDISK_S_STALE: 1149 case G_RAID_SUBDISK_S_RESYNC: 1150 break; 1151 case G_RAID_SUBDISK_S_REBUILD: 1152 if (offset + start >= sd->sd_rebuild_pos) 1153 goto nextdisk; 1154 break; 1155 default: 1156 goto nextdisk; 1157 } 1158 error = g_raid_subdisk_kerneldump(sd, 1159 addr, 0, offset + start, length); 1160 if (error != 0) 1161 return (error); 1162 nextdisk: 1163 if (++no >= vol->v_disks_count) { 1164 no = 0; 1165 offset += strip_size; 1166 } 1167 } 1168 remain -= length; 1169 addr += length; 1170 start = 0; 1171 } 1172 return (0); 1173 } 1174 1175 static int 1176 g_raid_tr_locked_raid1e(struct g_raid_tr_object *tr, void *argp) 1177 { 1178 struct bio *bp; 1179 struct g_raid_subdisk *sd; 1180 1181 bp = (struct bio *)argp; 1182 sd = (struct g_raid_subdisk *)bp->bio_caller1; 1183 g_raid_subdisk_iostart(sd, bp); 1184 1185 return (0); 1186 } 1187 1188 static int 1189 g_raid_tr_idle_raid1e(struct g_raid_tr_object *tr) 1190 { 1191 struct g_raid_tr_raid1e_object *trs; 1192 struct g_raid_volume *vol; 1193 1194 vol = tr->tro_volume; 1195 trs = (struct g_raid_tr_raid1e_object *)tr; 1196 trs->trso_fair_io = g_raid1e_rebuild_fair_io; 1197 trs->trso_recover_slabs = g_raid1e_rebuild_cluster_idle; 1198 /* Compensate short rebuild I/Os. */ 1199 if ((vol->v_disks_count % N) != 0 && 1200 vol->v_strip_size < g_raid1e_rebuild_slab) { 1201 trs->trso_recover_slabs *= g_raid1e_rebuild_slab; 1202 trs->trso_recover_slabs /= vol->v_strip_size; 1203 } 1204 if (trs->trso_type == TR_RAID1E_REBUILD) 1205 g_raid_tr_raid1e_rebuild_some(tr); 1206 return (0); 1207 } 1208 1209 static int 1210 g_raid_tr_free_raid1e(struct g_raid_tr_object *tr) 1211 { 1212 struct g_raid_tr_raid1e_object *trs; 1213 1214 trs = (struct g_raid_tr_raid1e_object *)tr; 1215 1216 if (trs->trso_buffer != NULL) { 1217 free(trs->trso_buffer, M_TR_RAID1E); 1218 trs->trso_buffer = NULL; 1219 } 1220 return (0); 1221 } 1222 1223 G_RAID_TR_DECLARE(g_raid_tr_raid1e);
Cache object: ce4b35bec03094e49b86cc967cdaf5bb
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