sys/geom/raid/tr_raid1.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2010 Alexander Motin <mav@FreeBSD.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <sys/param.h>
  33 #include <sys/bio.h>
  34 #include <sys/endian.h>
  35 #include <sys/kernel.h>
  36 #include <sys/kobj.h>
  37 #include <sys/limits.h>
  38 #include <sys/lock.h>
  39 #include <sys/malloc.h>
  40 #include <sys/mutex.h>
  41 #include <sys/sysctl.h>
  42 #include <sys/systm.h>
  43 #include <geom/geom.h>
  44 #include "geom/raid/g_raid.h"
  45 #include "g_raid_tr_if.h"
  46
  47 SYSCTL_DECL(_kern_geom_raid_raid1);
  48
  49 #define RAID1_REBUILD_SLAB      (1 << 20) /* One transation in a rebuild */
  50 static int g_raid1_rebuild_slab = RAID1_REBUILD_SLAB;
  51 SYSCTL_UINT(_kern_geom_raid_raid1, OID_AUTO, rebuild_slab_size, CTLFLAG_RWTUN,
  52     &g_raid1_rebuild_slab, 0,
  53     "Amount of the disk to rebuild each read/write cycle of the rebuild.");
  54
  55 #define RAID1_REBUILD_FAIR_IO 20 /* use 1/x of the available I/O */
  56 static int g_raid1_rebuild_fair_io = RAID1_REBUILD_FAIR_IO;
  57 SYSCTL_UINT(_kern_geom_raid_raid1, OID_AUTO, rebuild_fair_io, CTLFLAG_RWTUN,
  58     &g_raid1_rebuild_fair_io, 0,
  59     "Fraction of the I/O bandwidth to use when disk busy for rebuild.");
  60
  61 #define RAID1_REBUILD_CLUSTER_IDLE 100
  62 static int g_raid1_rebuild_cluster_idle = RAID1_REBUILD_CLUSTER_IDLE;
  63 SYSCTL_UINT(_kern_geom_raid_raid1, OID_AUTO, rebuild_cluster_idle, CTLFLAG_RWTUN,
  64     &g_raid1_rebuild_cluster_idle, 0,
  65     "Number of slabs to do each time we trigger a rebuild cycle");
  66
  67 #define RAID1_REBUILD_META_UPDATE 1024 /* update meta data every 1GB or so */
  68 static int g_raid1_rebuild_meta_update = RAID1_REBUILD_META_UPDATE;
  69 SYSCTL_UINT(_kern_geom_raid_raid1, OID_AUTO, rebuild_meta_update, CTLFLAG_RWTUN,
  70     &g_raid1_rebuild_meta_update, 0,
  71     "When to update the meta data.");
  72
  73 static MALLOC_DEFINE(M_TR_RAID1, "tr_raid1_data", "GEOM_RAID RAID1 data");
  74
  75 #define TR_RAID1_NONE 0
  76 #define TR_RAID1_REBUILD 1
  77 #define TR_RAID1_RESYNC 2
  78
  79 #define TR_RAID1_F_DOING_SOME   0x1
  80 #define TR_RAID1_F_LOCKED       0x2
  81 #define TR_RAID1_F_ABORT        0x4
  82
  83 struct g_raid_tr_raid1_object {
  84         struct g_raid_tr_object  trso_base;
  85         int                      trso_starting;
  86         int                      trso_stopping;
  87         int                      trso_type;
  88         int                      trso_recover_slabs; /* slabs before rest */
  89         int                      trso_fair_io;
  90         int                      trso_meta_update;
  91         int                      trso_flags;
  92         struct g_raid_subdisk   *trso_failed_sd; /* like per volume */
  93         void                    *trso_buffer;    /* Buffer space */
  94         struct bio               trso_bio;
  95 };
  96
  97 static g_raid_tr_taste_t g_raid_tr_taste_raid1;
  98 static g_raid_tr_event_t g_raid_tr_event_raid1;
  99 static g_raid_tr_start_t g_raid_tr_start_raid1;
 100 static g_raid_tr_stop_t g_raid_tr_stop_raid1;
 101 static g_raid_tr_iostart_t g_raid_tr_iostart_raid1;
 102 static g_raid_tr_iodone_t g_raid_tr_iodone_raid1;
 103 static g_raid_tr_kerneldump_t g_raid_tr_kerneldump_raid1;
 104 static g_raid_tr_locked_t g_raid_tr_locked_raid1;
 105 static g_raid_tr_idle_t g_raid_tr_idle_raid1;
 106 static g_raid_tr_free_t g_raid_tr_free_raid1;
 107
 108 static kobj_method_t g_raid_tr_raid1_methods[] = {
 109         KOBJMETHOD(g_raid_tr_taste,     g_raid_tr_taste_raid1),
 110         KOBJMETHOD(g_raid_tr_event,     g_raid_tr_event_raid1),
 111         KOBJMETHOD(g_raid_tr_start,     g_raid_tr_start_raid1),
 112         KOBJMETHOD(g_raid_tr_stop,      g_raid_tr_stop_raid1),
 113         KOBJMETHOD(g_raid_tr_iostart,   g_raid_tr_iostart_raid1),
 114         KOBJMETHOD(g_raid_tr_iodone,    g_raid_tr_iodone_raid1),
 115         KOBJMETHOD(g_raid_tr_kerneldump, g_raid_tr_kerneldump_raid1),
 116         KOBJMETHOD(g_raid_tr_locked,    g_raid_tr_locked_raid1),
 117         KOBJMETHOD(g_raid_tr_idle,      g_raid_tr_idle_raid1),
 118         KOBJMETHOD(g_raid_tr_free,      g_raid_tr_free_raid1),
 119         { 0, 0 }
 120 };
 121
 122 static struct g_raid_tr_class g_raid_tr_raid1_class = {
 123         "RAID1",
 124         g_raid_tr_raid1_methods,
 125         sizeof(struct g_raid_tr_raid1_object),
 126         .trc_enable = 1,
 127         .trc_priority = 100,
 128         .trc_accept_unmapped = 1
 129 };
 130
 131 static void g_raid_tr_raid1_rebuild_abort(struct g_raid_tr_object *tr);
 132 static void g_raid_tr_raid1_maybe_rebuild(struct g_raid_tr_object *tr,
 133     struct g_raid_subdisk *sd);
 134
 135 static int
 136 g_raid_tr_taste_raid1(struct g_raid_tr_object *tr, struct g_raid_volume *vol)
 137 {
 138         struct g_raid_tr_raid1_object *trs;
 139
 140         trs = (struct g_raid_tr_raid1_object *)tr;
 141         if (tr->tro_volume->v_raid_level != G_RAID_VOLUME_RL_RAID1 ||
 142             (tr->tro_volume->v_raid_level_qualifier != G_RAID_VOLUME_RLQ_R1SM &&
 143              tr->tro_volume->v_raid_level_qualifier != G_RAID_VOLUME_RLQ_R1MM))
 144                 return (G_RAID_TR_TASTE_FAIL);
 145         trs->trso_starting = 1;
 146         return (G_RAID_TR_TASTE_SUCCEED);
 147 }
 148
 149 static int
 150 g_raid_tr_update_state_raid1(struct g_raid_volume *vol,
 151     struct g_raid_subdisk *sd)
 152 {
 153         struct g_raid_tr_raid1_object *trs;
 154         struct g_raid_softc *sc;
 155         struct g_raid_subdisk *tsd, *bestsd;
 156         u_int s;
 157         int i, na, ns;
 158
 159         sc = vol->v_softc;
 160         trs = (struct g_raid_tr_raid1_object *)vol->v_tr;
 161         if (trs->trso_stopping &&
 162             (trs->trso_flags & TR_RAID1_F_DOING_SOME) == 0)
 163                 s = G_RAID_VOLUME_S_STOPPED;
 164         else if (trs->trso_starting)
 165                 s = G_RAID_VOLUME_S_STARTING;
 166         else {
 167                 /* Make sure we have at least one ACTIVE disk. */
 168                 na = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_ACTIVE);
 169                 if (na == 0) {
 170                         /*
 171                          * Critical situation! We have no any active disk!
 172                          * Choose the best disk we have to make it active.
 173                          */
 174                         bestsd = &vol->v_subdisks[0];
 175                         for (i = 1; i < vol->v_disks_count; i++) {
 176                                 tsd = &vol->v_subdisks[i];
 177                                 if (tsd->sd_state > bestsd->sd_state)
 178                                         bestsd = tsd;
 179                                 else if (tsd->sd_state == bestsd->sd_state &&
 180                                     (tsd->sd_state == G_RAID_SUBDISK_S_REBUILD ||
 181                                      tsd->sd_state == G_RAID_SUBDISK_S_RESYNC) &&
 182                                     tsd->sd_rebuild_pos > bestsd->sd_rebuild_pos)
 183                                         bestsd = tsd;
 184                         }
 185                         if (bestsd->sd_state >= G_RAID_SUBDISK_S_UNINITIALIZED) {
 186                                 /* We found reasonable candidate. */
 187                                 G_RAID_DEBUG1(1, sc,
 188                                     "Promote subdisk %s:%d from %s to ACTIVE.",
 189                                     vol->v_name, bestsd->sd_pos,
 190                                     g_raid_subdisk_state2str(bestsd->sd_state));
 191                                 g_raid_change_subdisk_state(bestsd,
 192                                     G_RAID_SUBDISK_S_ACTIVE);
 193                                 g_raid_write_metadata(sc,
 194                                     vol, bestsd, bestsd->sd_disk);
 195                         }
 196                 }
 197                 na = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_ACTIVE);
 198                 ns = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_STALE) +
 199                      g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_RESYNC);
 200                 if (na == vol->v_disks_count)
 201                         s = G_RAID_VOLUME_S_OPTIMAL;
 202                 else if (na + ns == vol->v_disks_count)
 203                         s = G_RAID_VOLUME_S_SUBOPTIMAL;
 204                 else if (na > 0)
 205                         s = G_RAID_VOLUME_S_DEGRADED;
 206                 else
 207                         s = G_RAID_VOLUME_S_BROKEN;
 208                 g_raid_tr_raid1_maybe_rebuild(vol->v_tr, sd);
 209         }
 210         if (s != vol->v_state) {
 211                 g_raid_event_send(vol, G_RAID_VOLUME_S_ALIVE(s) ?
 212                     G_RAID_VOLUME_E_UP : G_RAID_VOLUME_E_DOWN,
 213                     G_RAID_EVENT_VOLUME);
 214                 g_raid_change_volume_state(vol, s);
 215                 if (!trs->trso_starting && !trs->trso_stopping)
 216                         g_raid_write_metadata(sc, vol, NULL, NULL);
 217         }
 218         return (0);
 219 }
 220
 221 static void
 222 g_raid_tr_raid1_fail_disk(struct g_raid_softc *sc, struct g_raid_subdisk *sd,
 223     struct g_raid_disk *disk)
 224 {
 225         /*
 226          * We don't fail the last disk in the pack, since it still has decent
 227          * data on it and that's better than failing the disk if it is the root
 228          * file system.
 229          *
 230          * XXX should this be controlled via a tunable?  It makes sense for
 231          * the volume that has / on it.  I can't think of a case where we'd
 232          * want the volume to go away on this kind of event.
 233          */
 234         if (g_raid_nsubdisks(sd->sd_volume, G_RAID_SUBDISK_S_ACTIVE) == 1 &&
 235             g_raid_get_subdisk(sd->sd_volume, G_RAID_SUBDISK_S_ACTIVE) == sd)
 236                 return;
 237         g_raid_fail_disk(sc, sd, disk);
 238 }
 239
 240 static void
 241 g_raid_tr_raid1_rebuild_some(struct g_raid_tr_object *tr)
 242 {
 243         struct g_raid_tr_raid1_object *trs;
 244         struct g_raid_subdisk *sd, *good_sd;
 245         struct bio *bp;
 246
 247         trs = (struct g_raid_tr_raid1_object *)tr;
 248         if (trs->trso_flags & TR_RAID1_F_DOING_SOME)
 249                 return;
 250         sd = trs->trso_failed_sd;
 251         good_sd = g_raid_get_subdisk(sd->sd_volume, G_RAID_SUBDISK_S_ACTIVE);
 252         if (good_sd == NULL) {
 253                 g_raid_tr_raid1_rebuild_abort(tr);
 254                 return;
 255         }
 256         bp = &trs->trso_bio;
 257         memset(bp, 0, sizeof(*bp));
 258         bp->bio_offset = sd->sd_rebuild_pos;
 259         bp->bio_length = MIN(g_raid1_rebuild_slab,
 260             sd->sd_size - sd->sd_rebuild_pos);
 261         bp->bio_data = trs->trso_buffer;
 262         bp->bio_cmd = BIO_READ;
 263         bp->bio_cflags = G_RAID_BIO_FLAG_SYNC;
 264         bp->bio_caller1 = good_sd;
 265         trs->trso_flags |= TR_RAID1_F_DOING_SOME;
 266         trs->trso_flags |= TR_RAID1_F_LOCKED;
 267         g_raid_lock_range(sd->sd_volume,        /* Lock callback starts I/O */
 268            bp->bio_offset, bp->bio_length, NULL, bp);
 269 }
 270
 271 static void
 272 g_raid_tr_raid1_rebuild_done(struct g_raid_tr_raid1_object *trs)
 273 {
 274         struct g_raid_volume *vol;
 275         struct g_raid_subdisk *sd;
 276
 277         vol = trs->trso_base.tro_volume;
 278         sd = trs->trso_failed_sd;
 279         g_raid_write_metadata(vol->v_softc, vol, sd, sd->sd_disk);
 280         free(trs->trso_buffer, M_TR_RAID1);
 281         trs->trso_buffer = NULL;
 282         trs->trso_flags &= ~TR_RAID1_F_DOING_SOME;
 283         trs->trso_type = TR_RAID1_NONE;
 284         trs->trso_recover_slabs = 0;
 285         trs->trso_failed_sd = NULL;
 286         g_raid_tr_update_state_raid1(vol, NULL);
 287 }
 288
 289 static void
 290 g_raid_tr_raid1_rebuild_finish(struct g_raid_tr_object *tr)
 291 {
 292         struct g_raid_tr_raid1_object *trs;
 293         struct g_raid_subdisk *sd;
 294
 295         trs = (struct g_raid_tr_raid1_object *)tr;
 296         sd = trs->trso_failed_sd;
 297         G_RAID_DEBUG1(0, tr->tro_volume->v_softc,
 298             "Subdisk %s:%d-%s rebuild completed.",
 299             sd->sd_volume->v_name, sd->sd_pos,
 300             sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]");
 301         g_raid_change_subdisk_state(sd, G_RAID_SUBDISK_S_ACTIVE);
 302         sd->sd_rebuild_pos = 0;
 303         g_raid_tr_raid1_rebuild_done(trs);
 304 }
 305
 306 static void
 307 g_raid_tr_raid1_rebuild_abort(struct g_raid_tr_object *tr)
 308 {
 309         struct g_raid_tr_raid1_object *trs;
 310         struct g_raid_subdisk *sd;
 311         struct g_raid_volume *vol;
 312         off_t len;
 313
 314         vol = tr->tro_volume;
 315         trs = (struct g_raid_tr_raid1_object *)tr;
 316         sd = trs->trso_failed_sd;
 317         if (trs->trso_flags & TR_RAID1_F_DOING_SOME) {
 318                 G_RAID_DEBUG1(1, vol->v_softc,
 319                     "Subdisk %s:%d-%s rebuild is aborting.",
 320                     sd->sd_volume->v_name, sd->sd_pos,
 321                     sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]");
 322                 trs->trso_flags |= TR_RAID1_F_ABORT;
 323         } else {
 324                 G_RAID_DEBUG1(0, vol->v_softc,
 325                     "Subdisk %s:%d-%s rebuild aborted.",
 326                     sd->sd_volume->v_name, sd->sd_pos,
 327                     sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]");
 328                 trs->trso_flags &= ~TR_RAID1_F_ABORT;
 329                 if (trs->trso_flags & TR_RAID1_F_LOCKED) {
 330                         trs->trso_flags &= ~TR_RAID1_F_LOCKED;
 331                         len = MIN(g_raid1_rebuild_slab,
 332                             sd->sd_size - sd->sd_rebuild_pos);
 333                         g_raid_unlock_range(tr->tro_volume,
 334                             sd->sd_rebuild_pos, len);
 335                 }
 336                 g_raid_tr_raid1_rebuild_done(trs);
 337         }
 338 }
 339
 340 static void
 341 g_raid_tr_raid1_rebuild_start(struct g_raid_tr_object *tr)
 342 {
 343         struct g_raid_volume *vol;
 344         struct g_raid_tr_raid1_object *trs;
 345         struct g_raid_subdisk *sd, *fsd;
 346
 347         vol = tr->tro_volume;
 348         trs = (struct g_raid_tr_raid1_object *)tr;
 349         if (trs->trso_failed_sd) {
 350                 G_RAID_DEBUG1(1, vol->v_softc,
 351                     "Already rebuild in start rebuild. pos %jd\n",
 352                     (intmax_t)trs->trso_failed_sd->sd_rebuild_pos);
 353                 return;
 354         }
 355         sd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_ACTIVE);
 356         if (sd == NULL) {
 357                 G_RAID_DEBUG1(1, vol->v_softc,
 358                     "No active disk to rebuild.  night night.");
 359                 return;
 360         }
 361         fsd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_RESYNC);
 362         if (fsd == NULL)
 363                 fsd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_REBUILD);
 364         if (fsd == NULL) {
 365                 fsd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_STALE);
 366                 if (fsd != NULL) {
 367                         fsd->sd_rebuild_pos = 0;
 368                         g_raid_change_subdisk_state(fsd,
 369                             G_RAID_SUBDISK_S_RESYNC);
 370                         g_raid_write_metadata(vol->v_softc, vol, fsd, NULL);
 371                 } else {
 372                         fsd = g_raid_get_subdisk(vol,
 373                             G_RAID_SUBDISK_S_UNINITIALIZED);
 374                         if (fsd == NULL)
 375                                 fsd = g_raid_get_subdisk(vol,
 376                                     G_RAID_SUBDISK_S_NEW);
 377                         if (fsd != NULL) {
 378                                 fsd->sd_rebuild_pos = 0;
 379                                 g_raid_change_subdisk_state(fsd,
 380                                     G_RAID_SUBDISK_S_REBUILD);
 381                                 g_raid_write_metadata(vol->v_softc,
 382                                     vol, fsd, NULL);
 383                         }
 384                 }
 385         }
 386         if (fsd == NULL) {
 387                 G_RAID_DEBUG1(1, vol->v_softc,
 388                     "No failed disk to rebuild.  night night.");
 389                 return;
 390         }
 391         trs->trso_failed_sd = fsd;
 392         G_RAID_DEBUG1(0, vol->v_softc,
 393             "Subdisk %s:%d-%s rebuild start at %jd.",
 394             fsd->sd_volume->v_name, fsd->sd_pos,
 395             fsd->sd_disk ? g_raid_get_diskname(fsd->sd_disk) : "[none]",
 396             trs->trso_failed_sd->sd_rebuild_pos);
 397         trs->trso_type = TR_RAID1_REBUILD;
 398         trs->trso_buffer = malloc(g_raid1_rebuild_slab, M_TR_RAID1, M_WAITOK);
 399         trs->trso_meta_update = g_raid1_rebuild_meta_update;
 400         g_raid_tr_raid1_rebuild_some(tr);
 401 }
 402
 403
 404 static void
 405 g_raid_tr_raid1_maybe_rebuild(struct g_raid_tr_object *tr,
 406     struct g_raid_subdisk *sd)
 407 {
 408         struct g_raid_volume *vol;
 409         struct g_raid_tr_raid1_object *trs;
 410         int na, nr;
 411
 412         /*
 413          * If we're stopping, don't do anything.  If we don't have at least one
 414          * good disk and one bad disk, we don't do anything.  And if there's a
 415          * 'good disk' stored in the trs, then we're in progress and we punt.
 416          * If we make it past all these checks, we need to rebuild.
 417          */
 418         vol = tr->tro_volume;
 419         trs = (struct g_raid_tr_raid1_object *)tr;
 420         if (trs->trso_stopping)
 421                 return;
 422         na = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_ACTIVE);
 423         nr = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_REBUILD) +
 424             g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_RESYNC);
 425         switch(trs->trso_type) {
 426         case TR_RAID1_NONE:
 427                 if (na == 0)
 428                         return;
 429                 if (nr == 0) {
 430                         nr = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_NEW) +
 431                             g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_STALE) +
 432                             g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_UNINITIALIZED);
 433                         if (nr == 0)
 434                                 return;
 435                 }
 436                 g_raid_tr_raid1_rebuild_start(tr);
 437                 break;
 438         case TR_RAID1_REBUILD:
 439                 if (na == 0 || nr == 0 || trs->trso_failed_sd == sd)
 440                         g_raid_tr_raid1_rebuild_abort(tr);
 441                 break;
 442         case TR_RAID1_RESYNC:
 443                 break;
 444         }
 445 }
 446
 447 static int
 448 g_raid_tr_event_raid1(struct g_raid_tr_object *tr,
 449     struct g_raid_subdisk *sd, u_int event)
 450 {
 451
 452         g_raid_tr_update_state_raid1(tr->tro_volume, sd);
 453         return (0);
 454 }
 455
 456 static int
 457 g_raid_tr_start_raid1(struct g_raid_tr_object *tr)
 458 {
 459         struct g_raid_tr_raid1_object *trs;
 460         struct g_raid_volume *vol;
 461
 462         trs = (struct g_raid_tr_raid1_object *)tr;
 463         vol = tr->tro_volume;
 464         trs->trso_starting = 0;
 465         g_raid_tr_update_state_raid1(vol, NULL);
 466         return (0);
 467 }
 468
 469 static int
 470 g_raid_tr_stop_raid1(struct g_raid_tr_object *tr)
 471 {
 472         struct g_raid_tr_raid1_object *trs;
 473         struct g_raid_volume *vol;
 474
 475         trs = (struct g_raid_tr_raid1_object *)tr;
 476         vol = tr->tro_volume;
 477         trs->trso_starting = 0;
 478         trs->trso_stopping = 1;
 479         g_raid_tr_update_state_raid1(vol, NULL);
 480         return (0);
 481 }
 482
 483 /*
 484  * Select the disk to read from.  Take into account: subdisk state, running
 485  * error recovery, average disk load, head position and possible cache hits.
 486  */
 487 #define ABS(x)          (((x) >= 0) ? (x) : (-(x)))
 488 static struct g_raid_subdisk *
 489 g_raid_tr_raid1_select_read_disk(struct g_raid_volume *vol, struct bio *bp,
 490     u_int mask)
 491 {
 492         struct g_raid_subdisk *sd, *best;
 493         int i, prio, bestprio;
 494
 495         best = NULL;
 496         bestprio = INT_MAX;
 497         for (i = 0; i < vol->v_disks_count; i++) {
 498                 sd = &vol->v_subdisks[i];
 499                 if (sd->sd_state != G_RAID_SUBDISK_S_ACTIVE &&
 500                     ((sd->sd_state != G_RAID_SUBDISK_S_REBUILD &&
 501                       sd->sd_state != G_RAID_SUBDISK_S_RESYNC) ||
 502                      bp->bio_offset + bp->bio_length > sd->sd_rebuild_pos))
 503                         continue;
 504                 if ((mask & (1 << i)) != 0)
 505                         continue;
 506                 prio = G_RAID_SUBDISK_LOAD(sd);
 507                 prio += min(sd->sd_recovery, 255) << 22;
 508                 prio += (G_RAID_SUBDISK_S_ACTIVE - sd->sd_state) << 16;
 509                 /* If disk head is precisely in position - highly prefer it. */
 510                 if (G_RAID_SUBDISK_POS(sd) == bp->bio_offset)
 511                         prio -= 2 * G_RAID_SUBDISK_LOAD_SCALE;
 512                 else
 513                 /* If disk head is close to position - prefer it. */
 514                 if (ABS(G_RAID_SUBDISK_POS(sd) - bp->bio_offset) <
 515                     G_RAID_SUBDISK_TRACK_SIZE)
 516                         prio -= 1 * G_RAID_SUBDISK_LOAD_SCALE;
 517                 if (prio < bestprio) {
 518                         best = sd;
 519                         bestprio = prio;
 520                 }
 521         }
 522         return (best);
 523 }
 524
 525 static void
 526 g_raid_tr_iostart_raid1_read(struct g_raid_tr_object *tr, struct bio *bp)
 527 {
 528         struct g_raid_subdisk *sd;
 529         struct bio *cbp;
 530
 531         sd = g_raid_tr_raid1_select_read_disk(tr->tro_volume, bp, 0);
 532         KASSERT(sd != NULL, ("No active disks in volume %s.",
 533                 tr->tro_volume->v_name));
 534
 535         cbp = g_clone_bio(bp);
 536         if (cbp == NULL) {
 537                 g_raid_iodone(bp, ENOMEM);
 538                 return;
 539         }
 540
 541         g_raid_subdisk_iostart(sd, cbp);
 542 }
 543
 544 static void
 545 g_raid_tr_iostart_raid1_write(struct g_raid_tr_object *tr, struct bio *bp)
 546 {
 547         struct g_raid_volume *vol;
 548         struct g_raid_subdisk *sd;
 549         struct bio_queue_head queue;
 550         struct bio *cbp;
 551         int i;
 552
 553         vol = tr->tro_volume;
 554
 555         /*
 556          * Allocate all bios before sending any request, so we can return
 557          * ENOMEM in nice and clean way.
 558          */
 559         bioq_init(&queue);
 560         for (i = 0; i < vol->v_disks_count; i++) {
 561                 sd = &vol->v_subdisks[i];
 562                 switch (sd->sd_state) {
 563                 case G_RAID_SUBDISK_S_ACTIVE:
 564                         break;
 565                 case G_RAID_SUBDISK_S_REBUILD:
 566                         /*
 567                          * When rebuilding, only part of this subdisk is
 568                          * writable, the rest will be written as part of the
 569                          * that process.
 570                          */
 571                         if (bp->bio_offset >= sd->sd_rebuild_pos)
 572                                 continue;
 573                         break;
 574                 case G_RAID_SUBDISK_S_STALE:
 575                 case G_RAID_SUBDISK_S_RESYNC:
 576                         /*
 577                          * Resyncing still writes on the theory that the
 578                          * resync'd disk is very close and writing it will
 579                          * keep it that way better if we keep up while
 580                          * resyncing.
 581                          */
 582                         break;
 583                 default:
 584                         continue;
 585                 }
 586                 cbp = g_clone_bio(bp);
 587                 if (cbp == NULL)
 588                         goto failure;
 589                 cbp->bio_caller1 = sd;
 590                 bioq_insert_tail(&queue, cbp);
 591         }
 592         while ((cbp = bioq_takefirst(&queue)) != NULL) {
 593                 sd = cbp->bio_caller1;
 594                 cbp->bio_caller1 = NULL;
 595                 g_raid_subdisk_iostart(sd, cbp);
 596         }
 597         return;
 598 failure:
 599         while ((cbp = bioq_takefirst(&queue)) != NULL)
 600                 g_destroy_bio(cbp);
 601         if (bp->bio_error == 0)
 602                 bp->bio_error = ENOMEM;
 603         g_raid_iodone(bp, bp->bio_error);
 604 }
 605
 606 static void
 607 g_raid_tr_iostart_raid1(struct g_raid_tr_object *tr, struct bio *bp)
 608 {
 609         struct g_raid_volume *vol;
 610         struct g_raid_tr_raid1_object *trs;
 611
 612         vol = tr->tro_volume;
 613         trs = (struct g_raid_tr_raid1_object *)tr;
 614         if (vol->v_state != G_RAID_VOLUME_S_OPTIMAL &&
 615             vol->v_state != G_RAID_VOLUME_S_SUBOPTIMAL &&
 616             vol->v_state != G_RAID_VOLUME_S_DEGRADED) {
 617                 g_raid_iodone(bp, EIO);
 618                 return;
 619         }
 620         /*
 621          * If we're rebuilding, squeeze in rebuild activity every so often,
 622          * even when the disk is busy.  Be sure to only count real I/O
 623          * to the disk.  All 'SPECIAL' I/O is traffic generated to the disk
 624          * by this module.
 625          */
 626         if (trs->trso_failed_sd != NULL &&
 627             !(bp->bio_cflags & G_RAID_BIO_FLAG_SPECIAL)) {
 628                 /* Make this new or running now round short. */
 629                 trs->trso_recover_slabs = 0;
 630                 if (--trs->trso_fair_io <= 0) {
 631                         trs->trso_fair_io = g_raid1_rebuild_fair_io;
 632                         g_raid_tr_raid1_rebuild_some(tr);
 633                 }
 634         }
 635         switch (bp->bio_cmd) {
 636         case BIO_READ:
 637                 g_raid_tr_iostart_raid1_read(tr, bp);
 638                 break;
 639         case BIO_WRITE:
 640         case BIO_DELETE:
 641                 g_raid_tr_iostart_raid1_write(tr, bp);
 642                 break;
 643         case BIO_FLUSH:
 644                 g_raid_tr_flush_common(tr, bp);
 645                 break;
 646         default:
 647                 KASSERT(1 == 0, ("Invalid command here: %u (volume=%s)",
 648                     bp->bio_cmd, vol->v_name));
 649                 break;
 650         }
 651 }
 652
 653 static void
 654 g_raid_tr_iodone_raid1(struct g_raid_tr_object *tr,
 655     struct g_raid_subdisk *sd, struct bio *bp)
 656 {
 657         struct bio *cbp;
 658         struct g_raid_subdisk *nsd;
 659         struct g_raid_volume *vol;
 660         struct bio *pbp;
 661         struct g_raid_tr_raid1_object *trs;
 662         uintptr_t *mask;
 663         int error, do_write;
 664
 665         trs = (struct g_raid_tr_raid1_object *)tr;
 666         vol = tr->tro_volume;
 667         if (bp->bio_cflags & G_RAID_BIO_FLAG_SYNC) {
 668                 /*
 669                  * This operation is part of a rebuild or resync operation.
 670                  * See what work just got done, then schedule the next bit of
 671                  * work, if any.  Rebuild/resync is done a little bit at a
 672                  * time.  Either when a timeout happens, or after we get a
 673                  * bunch of I/Os to the disk (to make sure an active system
 674                  * will complete in a sane amount of time).
 675                  *
 676                  * We are setup to do differing amounts of work for each of
 677                  * these cases.  so long as the slabs is smallish (less than
 678                  * 50 or so, I'd guess, but that's just a WAG), we shouldn't
 679                  * have any bio starvation issues.  For active disks, we do
 680                  * 5MB of data, for inactive ones, we do 50MB.
 681                  */
 682                 if (trs->trso_type == TR_RAID1_REBUILD) {
 683                         if (bp->bio_cmd == BIO_READ) {
 684
 685                                 /* Immediately abort rebuild, if requested. */
 686                                 if (trs->trso_flags & TR_RAID1_F_ABORT) {
 687                                         trs->trso_flags &= ~TR_RAID1_F_DOING_SOME;
 688                                         g_raid_tr_raid1_rebuild_abort(tr);
 689                                         return;
 690                                 }
 691
 692                                 /* On read error, skip and cross fingers. */
 693                                 if (bp->bio_error != 0) {
 694                                         G_RAID_LOGREQ(0, bp,
 695                                             "Read error during rebuild (%d), "
 696                                             "possible data loss!",
 697                                             bp->bio_error);
 698                                         goto rebuild_round_done;
 699                                 }
 700
 701                                 /*
 702                                  * The read operation finished, queue the
 703                                  * write and get out.
 704                                  */
 705                                 G_RAID_LOGREQ(4, bp, "rebuild read done. %d",
 706                                     bp->bio_error);
 707                                 bp->bio_cmd = BIO_WRITE;
 708                                 bp->bio_cflags = G_RAID_BIO_FLAG_SYNC;
 709                                 G_RAID_LOGREQ(4, bp, "Queueing rebuild write.");
 710                                 g_raid_subdisk_iostart(trs->trso_failed_sd, bp);
 711                         } else {
 712                                 /*
 713                                  * The write operation just finished.  Do
 714                                  * another.  We keep cloning the master bio
 715                                  * since it has the right buffers allocated to
 716                                  * it.
 717                                  */
 718                                 G_RAID_LOGREQ(4, bp,
 719                                     "rebuild write done. Error %d",
 720                                     bp->bio_error);
 721                                 nsd = trs->trso_failed_sd;
 722                                 if (bp->bio_error != 0 ||
 723                                     trs->trso_flags & TR_RAID1_F_ABORT) {
 724                                         if ((trs->trso_flags &
 725                                             TR_RAID1_F_ABORT) == 0) {
 726                                                 g_raid_tr_raid1_fail_disk(sd->sd_softc,
 727                                                     nsd, nsd->sd_disk);
 728                                         }
 729                                         trs->trso_flags &= ~TR_RAID1_F_DOING_SOME;
 730                                         g_raid_tr_raid1_rebuild_abort(tr);
 731                                         return;
 732                                 }
 733 rebuild_round_done:
 734                                 nsd = trs->trso_failed_sd;
 735                                 trs->trso_flags &= ~TR_RAID1_F_LOCKED;
 736                                 g_raid_unlock_range(sd->sd_volume,
 737                                     bp->bio_offset, bp->bio_length);
 738                                 nsd->sd_rebuild_pos += bp->bio_length;
 739                                 if (nsd->sd_rebuild_pos >= nsd->sd_size) {
 740                                         g_raid_tr_raid1_rebuild_finish(tr);
 741                                         return;
 742                                 }
 743
 744                                 /* Abort rebuild if we are stopping */
 745                                 if (trs->trso_stopping) {
 746                                         trs->trso_flags &= ~TR_RAID1_F_DOING_SOME;
 747                                         g_raid_tr_raid1_rebuild_abort(tr);
 748                                         return;
 749                                 }
 750
 751                                 if (--trs->trso_meta_update <= 0) {
 752                                         g_raid_write_metadata(vol->v_softc,
 753                                             vol, nsd, nsd->sd_disk);
 754                                         trs->trso_meta_update =
 755                                             g_raid1_rebuild_meta_update;
 756                                 }
 757                                 trs->trso_flags &= ~TR_RAID1_F_DOING_SOME;
 758                                 if (--trs->trso_recover_slabs <= 0)
 759                                         return;
 760                                 g_raid_tr_raid1_rebuild_some(tr);
 761                         }
 762                 } else if (trs->trso_type == TR_RAID1_RESYNC) {
 763                         /*
 764                          * read good sd, read bad sd in parallel.  when both
 765                          * done, compare the buffers.  write good to the bad
 766                          * if different.  do the next bit of work.
 767                          */
 768                         panic("Somehow, we think we're doing a resync");
 769                 }
 770                 return;
 771         }
 772         pbp = bp->bio_parent;
 773         pbp->bio_inbed++;
 774         if (bp->bio_cmd == BIO_READ && bp->bio_error != 0) {
 775                 /*
 776                  * Read failed on first drive.  Retry the read error on
 777                  * another disk drive, if available, before erroring out the
 778                  * read.
 779                  */
 780                 sd->sd_disk->d_read_errs++;
 781                 G_RAID_LOGREQ(0, bp,
 782                     "Read error (%d), %d read errors total",
 783                     bp->bio_error, sd->sd_disk->d_read_errs);
 784
 785                 /*
 786                  * If there are too many read errors, we move to degraded.
 787                  * XXX Do we want to FAIL the drive (eg, make the user redo
 788                  * everything to get it back in sync), or just degrade the
 789                  * drive, which kicks off a resync?
 790                  */
 791                 do_write = 1;
 792                 if (sd->sd_disk->d_read_errs > g_raid_read_err_thresh) {
 793                         g_raid_tr_raid1_fail_disk(sd->sd_softc, sd, sd->sd_disk);
 794                         if (pbp->bio_children == 1)
 795                                 do_write = 0;
 796                 }
 797
 798                 /*
 799                  * Find the other disk, and try to do the I/O to it.
 800                  */
 801                 mask = (uintptr_t *)(&pbp->bio_driver2);
 802                 if (pbp->bio_children == 1) {
 803                         /* Save original subdisk. */
 804                         pbp->bio_driver1 = do_write ? sd : NULL;
 805                         *mask = 0;
 806                 }
 807                 *mask |= 1 << sd->sd_pos;
 808                 nsd = g_raid_tr_raid1_select_read_disk(vol, pbp, *mask);
 809                 if (nsd != NULL && (cbp = g_clone_bio(pbp)) != NULL) {
 810                         g_destroy_bio(bp);
 811                         G_RAID_LOGREQ(2, cbp, "Retrying read from %d",
 812                             nsd->sd_pos);
 813                         if (pbp->bio_children == 2 && do_write) {
 814                                 sd->sd_recovery++;
 815                                 cbp->bio_caller1 = nsd;
 816                                 pbp->bio_pflags = G_RAID_BIO_FLAG_LOCKED;
 817                                 /* Lock callback starts I/O */
 818                                 g_raid_lock_range(sd->sd_volume,
 819                                     cbp->bio_offset, cbp->bio_length, pbp, cbp);
 820                         } else {
 821                                 g_raid_subdisk_iostart(nsd, cbp);
 822                         }
 823                         return;
 824                 }
 825                 /*
 826                  * We can't retry.  Return the original error by falling
 827                  * through.  This will happen when there's only one good disk.
 828                  * We don't need to fail the raid, since its actual state is
 829                  * based on the state of the subdisks.
 830                  */
 831                 G_RAID_LOGREQ(2, bp, "Couldn't retry read, failing it");
 832         }
 833         if (bp->bio_cmd == BIO_READ &&
 834             bp->bio_error == 0 &&
 835             pbp->bio_children > 1 &&
 836             pbp->bio_driver1 != NULL) {
 837                 /*
 838                  * If it was a read, and bio_children is >1, then we just
 839                  * recovered the data from the second drive.  We should try to
 840                  * write that data to the first drive if sector remapping is
 841                  * enabled.  A write should put the data in a new place on the
 842                  * disk, remapping the bad sector.  Do we need to do that by
 843                  * queueing a request to the main worker thread?  It doesn't
 844                  * affect the return code of this current read, and can be
 845                  * done at our leisure.  However, to make the code simpler, it
 846                  * is done synchronously.
 847                  */
 848                 G_RAID_LOGREQ(3, bp, "Recovered data from other drive");
 849                 cbp = g_clone_bio(pbp);
 850                 if (cbp != NULL) {
 851                         g_destroy_bio(bp);
 852                         cbp->bio_cmd = BIO_WRITE;
 853                         cbp->bio_cflags = G_RAID_BIO_FLAG_REMAP;
 854                         G_RAID_LOGREQ(2, cbp,
 855                             "Attempting bad sector remap on failing drive.");
 856                         g_raid_subdisk_iostart(pbp->bio_driver1, cbp);
 857                         return;
 858                 }
 859         }
 860         if (pbp->bio_pflags & G_RAID_BIO_FLAG_LOCKED) {
 861                 /*
 862                  * We're done with a recovery, mark the range as unlocked.
 863                  * For any write errors, we aggressively fail the disk since
 864                  * there was both a READ and a WRITE error at this location.
 865                  * Both types of errors generally indicates the drive is on
 866                  * the verge of total failure anyway.  Better to stop trusting
 867                  * it now.  However, we need to reset error to 0 in that case
 868                  * because we're not failing the original I/O which succeeded.
 869                  */
 870                 if (bp->bio_cmd == BIO_WRITE && bp->bio_error) {
 871                         G_RAID_LOGREQ(0, bp, "Remap write failed: "
 872                             "failing subdisk.");
 873                         g_raid_tr_raid1_fail_disk(sd->sd_softc, sd, sd->sd_disk);
 874                         bp->bio_error = 0;
 875                 }
 876                 if (pbp->bio_driver1 != NULL) {
 877                         ((struct g_raid_subdisk *)pbp->bio_driver1)
 878                             ->sd_recovery--;
 879                 }
 880                 G_RAID_LOGREQ(2, bp, "REMAP done %d.", bp->bio_error);
 881                 g_raid_unlock_range(sd->sd_volume, bp->bio_offset,
 882                     bp->bio_length);
 883         }
 884         if (pbp->bio_cmd != BIO_READ) {
 885                 if (pbp->bio_inbed == 1 || pbp->bio_error != 0)
 886                         pbp->bio_error = bp->bio_error;
 887                 if (pbp->bio_cmd == BIO_WRITE && bp->bio_error != 0) {
 888                         G_RAID_LOGREQ(0, bp, "Write failed: failing subdisk.");
 889                         g_raid_tr_raid1_fail_disk(sd->sd_softc, sd, sd->sd_disk);
 890                 }
 891                 error = pbp->bio_error;
 892         } else
 893                 error = bp->bio_error;
 894         g_destroy_bio(bp);
 895         if (pbp->bio_children == pbp->bio_inbed) {
 896                 pbp->bio_completed = pbp->bio_length;
 897                 g_raid_iodone(pbp, error);
 898         }
 899 }
 900
 901 static int
 902 g_raid_tr_kerneldump_raid1(struct g_raid_tr_object *tr,
 903     void *virtual, vm_offset_t physical, off_t offset, size_t length)
 904 {
 905         struct g_raid_volume *vol;
 906         struct g_raid_subdisk *sd;
 907         int error, i, ok;
 908
 909         vol = tr->tro_volume;
 910         error = 0;
 911         ok = 0;
 912         for (i = 0; i < vol->v_disks_count; i++) {
 913                 sd = &vol->v_subdisks[i];
 914                 switch (sd->sd_state) {
 915                 case G_RAID_SUBDISK_S_ACTIVE:
 916                         break;
 917                 case G_RAID_SUBDISK_S_REBUILD:
 918                         /*
 919                          * When rebuilding, only part of this subdisk is
 920                          * writable, the rest will be written as part of the
 921                          * that process.
 922                          */
 923                         if (offset >= sd->sd_rebuild_pos)
 924                                 continue;
 925                         break;
 926                 case G_RAID_SUBDISK_S_STALE:
 927                 case G_RAID_SUBDISK_S_RESYNC:
 928                         /*
 929                          * Resyncing still writes on the theory that the
 930                          * resync'd disk is very close and writing it will
 931                          * keep it that way better if we keep up while
 932                          * resyncing.
 933                          */
 934                         break;
 935                 default:
 936                         continue;
 937                 }
 938                 error = g_raid_subdisk_kerneldump(sd,
 939                     virtual, physical, offset, length);
 940                 if (error == 0)
 941                         ok++;
 942         }
 943         return (ok > 0 ? 0 : error);
 944 }
 945
 946 static int
 947 g_raid_tr_locked_raid1(struct g_raid_tr_object *tr, void *argp)
 948 {
 949         struct bio *bp;
 950         struct g_raid_subdisk *sd;
 951
 952         bp = (struct bio *)argp;
 953         sd = (struct g_raid_subdisk *)bp->bio_caller1;
 954         g_raid_subdisk_iostart(sd, bp);
 955
 956         return (0);
 957 }
 958
 959 static int
 960 g_raid_tr_idle_raid1(struct g_raid_tr_object *tr)
 961 {
 962         struct g_raid_tr_raid1_object *trs;
 963
 964         trs = (struct g_raid_tr_raid1_object *)tr;
 965         trs->trso_fair_io = g_raid1_rebuild_fair_io;
 966         trs->trso_recover_slabs = g_raid1_rebuild_cluster_idle;
 967         if (trs->trso_type == TR_RAID1_REBUILD)
 968                 g_raid_tr_raid1_rebuild_some(tr);
 969         return (0);
 970 }
 971
 972 static int
 973 g_raid_tr_free_raid1(struct g_raid_tr_object *tr)
 974 {
 975         struct g_raid_tr_raid1_object *trs;
 976
 977         trs = (struct g_raid_tr_raid1_object *)tr;
 978
 979         if (trs->trso_buffer != NULL) {
 980                 free(trs->trso_buffer, M_TR_RAID1);
 981                 trs->trso_buffer = NULL;
 982         }
 983         return (0);
 984 }
 985
 986 G_RAID_TR_DECLARE(raid1, "RAID1");