g_mirror.c revision 137254
1/*- 2 * Copyright (c) 2004 Pawel Jakub Dawidek <pjd@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: head/sys/geom/mirror/g_mirror.c 137254 2004-11-05 12:35:21Z pjd $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/kernel.h> 33#include <sys/module.h> 34#include <sys/limits.h> 35#include <sys/lock.h> 36#include <sys/mutex.h> 37#include <sys/bio.h> 38#include <sys/sysctl.h> 39#include <sys/malloc.h> 40#include <sys/eventhandler.h> 41#include <vm/uma.h> 42#include <geom/geom.h> 43#include <sys/proc.h> 44#include <sys/kthread.h> 45#include <geom/mirror/g_mirror.h> 46 47 48static MALLOC_DEFINE(M_MIRROR, "mirror data", "GEOM_MIRROR Data"); 49 50SYSCTL_DECL(_kern_geom); 51SYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW, 0, "GEOM_MIRROR stuff"); 52u_int g_mirror_debug = 0; 53TUNABLE_INT("kern.geom.mirror.debug", &g_mirror_debug); 54SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RW, &g_mirror_debug, 0, 55 "Debug level"); 56static u_int g_mirror_timeout = 4; 57TUNABLE_INT("kern.geom.mirror.timeout", &g_mirror_timeout); 58SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RW, &g_mirror_timeout, 59 0, "Time to wait on all mirror components"); 60static u_int g_mirror_idletime = 5; 61TUNABLE_INT("kern.geom.mirror.idletime", &g_mirror_idletime); 62SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, idletime, CTLFLAG_RW, 63 &g_mirror_idletime, 0, "Mark components as clean when idling"); 64static u_int g_mirror_reqs_per_sync = 5; 65SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, reqs_per_sync, CTLFLAG_RW, 66 &g_mirror_reqs_per_sync, 0, 67 "Number of regular I/O requests per synchronization request"); 68static u_int g_mirror_syncs_per_sec = 100; 69SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, syncs_per_sec, CTLFLAG_RW, 70 &g_mirror_syncs_per_sec, 0, 71 "Number of synchronizations requests per second"); 72 73#define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \ 74 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \ 75 msleep((ident), (mtx), (priority), (wmesg), (timeout)); \ 76 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \ 77} while (0) 78 79static eventhandler_tag g_mirror_ehtag = NULL; 80 81static int g_mirror_destroy_geom(struct gctl_req *req, struct g_class *mp, 82 struct g_geom *gp); 83static g_taste_t g_mirror_taste; 84static void g_mirror_init(struct g_class *mp); 85static void g_mirror_fini(struct g_class *mp); 86 87struct g_class g_mirror_class = { 88 .name = G_MIRROR_CLASS_NAME, 89 .version = G_VERSION, 90 .ctlreq = g_mirror_config, 91 .taste = g_mirror_taste, 92 .destroy_geom = g_mirror_destroy_geom, 93 .init = g_mirror_init, 94 .fini = g_mirror_fini 95}; 96 97 98static void g_mirror_destroy_provider(struct g_mirror_softc *sc); 99static int g_mirror_update_disk(struct g_mirror_disk *disk, u_int state); 100static void g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force); 101static void g_mirror_dumpconf(struct sbuf *sb, const char *indent, 102 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp); 103static void g_mirror_sync_stop(struct g_mirror_disk *disk, int type); 104 105 106static const char * 107g_mirror_disk_state2str(int state) 108{ 109 110 switch (state) { 111 case G_MIRROR_DISK_STATE_NONE: 112 return ("NONE"); 113 case G_MIRROR_DISK_STATE_NEW: 114 return ("NEW"); 115 case G_MIRROR_DISK_STATE_ACTIVE: 116 return ("ACTIVE"); 117 case G_MIRROR_DISK_STATE_STALE: 118 return ("STALE"); 119 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 120 return ("SYNCHRONIZING"); 121 case G_MIRROR_DISK_STATE_DISCONNECTED: 122 return ("DISCONNECTED"); 123 case G_MIRROR_DISK_STATE_DESTROY: 124 return ("DESTROY"); 125 default: 126 return ("INVALID"); 127 } 128} 129 130static const char * 131g_mirror_device_state2str(int state) 132{ 133 134 switch (state) { 135 case G_MIRROR_DEVICE_STATE_STARTING: 136 return ("STARTING"); 137 case G_MIRROR_DEVICE_STATE_RUNNING: 138 return ("RUNNING"); 139 default: 140 return ("INVALID"); 141 } 142} 143 144static const char * 145g_mirror_get_diskname(struct g_mirror_disk *disk) 146{ 147 148 if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL) 149 return ("[unknown]"); 150 return (disk->d_name); 151} 152 153/* 154 * --- Events handling functions --- 155 * Events in geom_mirror are used to maintain disks and device status 156 * from one thread to simplify locking. 157 */ 158static void 159g_mirror_event_free(struct g_mirror_event *ep) 160{ 161 162 free(ep, M_MIRROR); 163} 164 165int 166g_mirror_event_send(void *arg, int state, int flags) 167{ 168 struct g_mirror_softc *sc; 169 struct g_mirror_disk *disk; 170 struct g_mirror_event *ep; 171 int error; 172 173 ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK); 174 G_MIRROR_DEBUG(4, "%s: Sending event %p.", __func__, ep); 175 if ((flags & G_MIRROR_EVENT_DEVICE) != 0) { 176 disk = NULL; 177 sc = arg; 178 } else { 179 disk = arg; 180 sc = disk->d_softc; 181 } 182 ep->e_disk = disk; 183 ep->e_state = state; 184 ep->e_flags = flags; 185 ep->e_error = 0; 186 mtx_lock(&sc->sc_events_mtx); 187 TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next); 188 mtx_unlock(&sc->sc_events_mtx); 189 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 190 mtx_lock(&sc->sc_queue_mtx); 191 wakeup(sc); 192 mtx_unlock(&sc->sc_queue_mtx); 193 if ((flags & G_MIRROR_EVENT_DONTWAIT) != 0) 194 return (0); 195 g_topology_assert(); 196 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep); 197 g_topology_unlock(); 198 while ((ep->e_flags & G_MIRROR_EVENT_DONE) == 0) { 199 mtx_lock(&sc->sc_events_mtx); 200 MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "m:event", 201 hz * 5); 202 } 203 /* Don't even try to use 'sc' here, because it could be already dead. */ 204 g_topology_lock(); 205 error = ep->e_error; 206 g_mirror_event_free(ep); 207 return (error); 208} 209 210static struct g_mirror_event * 211g_mirror_event_get(struct g_mirror_softc *sc) 212{ 213 struct g_mirror_event *ep; 214 215 mtx_lock(&sc->sc_events_mtx); 216 ep = TAILQ_FIRST(&sc->sc_events); 217 if (ep != NULL) 218 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 219 mtx_unlock(&sc->sc_events_mtx); 220 return (ep); 221} 222 223static void 224g_mirror_event_cancel(struct g_mirror_disk *disk) 225{ 226 struct g_mirror_softc *sc; 227 struct g_mirror_event *ep, *tmpep; 228 229 g_topology_assert(); 230 231 sc = disk->d_softc; 232 mtx_lock(&sc->sc_events_mtx); 233 TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) { 234 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) 235 continue; 236 if (ep->e_disk != disk) 237 continue; 238 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 239 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 240 g_mirror_event_free(ep); 241 else { 242 ep->e_error = ECANCELED; 243 wakeup(ep); 244 } 245 } 246 mtx_unlock(&sc->sc_events_mtx); 247} 248 249/* 250 * Return the number of disks in given state. 251 * If state is equal to -1, count all connected disks. 252 */ 253u_int 254g_mirror_ndisks(struct g_mirror_softc *sc, int state) 255{ 256 struct g_mirror_disk *disk; 257 u_int n = 0; 258 259 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 260 if (state == -1 || disk->d_state == state) 261 n++; 262 } 263 return (n); 264} 265 266/* 267 * Find a disk in mirror by its disk ID. 268 */ 269static struct g_mirror_disk * 270g_mirror_id2disk(struct g_mirror_softc *sc, uint32_t id) 271{ 272 struct g_mirror_disk *disk; 273 274 g_topology_assert(); 275 276 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 277 if (disk->d_id == id) 278 return (disk); 279 } 280 return (NULL); 281} 282 283static u_int 284g_mirror_nrequests(struct g_mirror_softc *sc, struct g_consumer *cp) 285{ 286 struct bio *bp; 287 u_int nreqs = 0; 288 289 mtx_lock(&sc->sc_queue_mtx); 290 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) { 291 if (bp->bio_from == cp) 292 nreqs++; 293 } 294 mtx_unlock(&sc->sc_queue_mtx); 295 return (nreqs); 296} 297 298static int 299g_mirror_is_busy(struct g_mirror_softc *sc, struct g_consumer *cp) 300{ 301 302 if (cp->index > 0) { 303 G_MIRROR_DEBUG(2, 304 "I/O requests for %s exist, can't destroy it now.", 305 cp->provider->name); 306 return (1); 307 } 308 if (g_mirror_nrequests(sc, cp) > 0) { 309 G_MIRROR_DEBUG(2, 310 "I/O requests for %s in queue, can't destroy it now.", 311 cp->provider->name); 312 return (1); 313 } 314 return (0); 315} 316 317static void 318g_mirror_kill_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 319{ 320 321 g_topology_assert(); 322 323 cp->private = NULL; 324 if (g_mirror_is_busy(sc, cp)) 325 return; 326 G_MIRROR_DEBUG(2, "Consumer %s destroyed.", cp->provider->name); 327 g_detach(cp); 328 g_destroy_consumer(cp); 329} 330 331static int 332g_mirror_connect_disk(struct g_mirror_disk *disk, struct g_provider *pp) 333{ 334 int error; 335 336 g_topology_assert(); 337 KASSERT(disk->d_consumer == NULL, 338 ("Disk already connected (device %s).", disk->d_softc->sc_name)); 339 340 disk->d_consumer = g_new_consumer(disk->d_softc->sc_geom); 341 disk->d_consumer->private = disk; 342 disk->d_consumer->index = 0; 343 error = g_attach(disk->d_consumer, pp); 344 if (error != 0) 345 return (error); 346 G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk)); 347 return (0); 348} 349 350static void 351g_mirror_disconnect_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 352{ 353 354 g_topology_assert(); 355 356 if (cp == NULL) 357 return; 358 if (cp->provider != NULL) { 359 G_MIRROR_DEBUG(2, "Disk %s disconnected.", cp->provider->name); 360 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) { 361 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", 362 cp->provider->name, -cp->acr, -cp->acw, -cp->ace, 363 0); 364 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 365 } 366 g_mirror_kill_consumer(sc, cp); 367 } else { 368 g_destroy_consumer(cp); 369 } 370} 371 372/* 373 * Initialize disk. This means allocate memory, create consumer, attach it 374 * to the provider and open access (r1w1e1) to it. 375 */ 376static struct g_mirror_disk * 377g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp, 378 struct g_mirror_metadata *md, int *errorp) 379{ 380 struct g_mirror_disk *disk; 381 int error; 382 383 disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO); 384 if (disk == NULL) { 385 error = ENOMEM; 386 goto fail; 387 } 388 disk->d_softc = sc; 389 error = g_mirror_connect_disk(disk, pp); 390 if (error != 0) 391 goto fail; 392 disk->d_id = md->md_did; 393 disk->d_state = G_MIRROR_DISK_STATE_NONE; 394 disk->d_priority = md->md_priority; 395 disk->d_delay.sec = 0; 396 disk->d_delay.frac = 0; 397 binuptime(&disk->d_last_used); 398 disk->d_flags = md->md_dflags; 399 if (md->md_provider[0] != '\0') 400 disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED; 401 disk->d_sync.ds_consumer = NULL; 402 disk->d_sync.ds_offset = md->md_sync_offset; 403 disk->d_sync.ds_offset_done = md->md_sync_offset; 404 disk->d_sync.ds_resync = -1; 405 disk->d_sync.ds_syncid = md->md_syncid; 406 if (errorp != NULL) 407 *errorp = 0; 408 return (disk); 409fail: 410 if (errorp != NULL) 411 *errorp = error; 412 if (disk != NULL) { 413 g_mirror_disconnect_consumer(sc, disk->d_consumer); 414 free(disk, M_MIRROR); 415 } 416 return (NULL); 417} 418 419static void 420g_mirror_destroy_disk(struct g_mirror_disk *disk) 421{ 422 struct g_mirror_softc *sc; 423 424 g_topology_assert(); 425 426 LIST_REMOVE(disk, d_next); 427 g_mirror_event_cancel(disk); 428 sc = disk->d_softc; 429 if (sc->sc_hint == disk) 430 sc->sc_hint = NULL; 431 switch (disk->d_state) { 432 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 433 g_mirror_sync_stop(disk, 1); 434 /* FALLTHROUGH */ 435 case G_MIRROR_DISK_STATE_NEW: 436 case G_MIRROR_DISK_STATE_STALE: 437 case G_MIRROR_DISK_STATE_ACTIVE: 438 g_mirror_disconnect_consumer(sc, disk->d_consumer); 439 free(disk, M_MIRROR); 440 break; 441 default: 442 KASSERT(0 == 1, ("Wrong disk state (%s, %s).", 443 g_mirror_get_diskname(disk), 444 g_mirror_disk_state2str(disk->d_state))); 445 } 446} 447 448static void 449g_mirror_destroy_device(struct g_mirror_softc *sc) 450{ 451 struct g_mirror_disk *disk; 452 struct g_mirror_event *ep; 453 struct g_geom *gp; 454 struct g_consumer *cp, *tmpcp; 455 456 g_topology_assert(); 457 458 gp = sc->sc_geom; 459 if (sc->sc_provider != NULL) 460 g_mirror_destroy_provider(sc); 461 for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL; 462 disk = LIST_FIRST(&sc->sc_disks)) { 463 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 464 g_mirror_update_metadata(disk); 465 g_mirror_destroy_disk(disk); 466 } 467 while ((ep = g_mirror_event_get(sc)) != NULL) { 468 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 469 g_mirror_event_free(ep); 470 else { 471 ep->e_error = ECANCELED; 472 ep->e_flags |= G_MIRROR_EVENT_DONE; 473 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep); 474 mtx_lock(&sc->sc_events_mtx); 475 wakeup(ep); 476 mtx_unlock(&sc->sc_events_mtx); 477 } 478 } 479 callout_drain(&sc->sc_callout); 480 gp->softc = NULL; 481 482 LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) { 483 g_mirror_disconnect_consumer(sc, cp); 484 } 485 sc->sc_sync.ds_geom->softc = NULL; 486 g_wither_geom(sc->sc_sync.ds_geom, ENXIO); 487 mtx_destroy(&sc->sc_queue_mtx); 488 mtx_destroy(&sc->sc_events_mtx); 489 G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name); 490 g_wither_geom(gp, ENXIO); 491} 492 493static void 494g_mirror_orphan(struct g_consumer *cp) 495{ 496 struct g_mirror_disk *disk; 497 498 g_topology_assert(); 499 500 disk = cp->private; 501 if (disk == NULL) 502 return; 503 disk->d_softc->sc_bump_syncid = G_MIRROR_BUMP_ON_FIRST_WRITE; 504 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 505 G_MIRROR_EVENT_DONTWAIT); 506} 507 508static void 509g_mirror_spoiled(struct g_consumer *cp) 510{ 511 struct g_mirror_disk *disk; 512 513 g_topology_assert(); 514 515 disk = cp->private; 516 if (disk == NULL) 517 return; 518 disk->d_softc->sc_bump_syncid = G_MIRROR_BUMP_IMMEDIATELY; 519 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 520 G_MIRROR_EVENT_DONTWAIT); 521} 522 523/* 524 * Function should return the next active disk on the list. 525 * It is possible that it will be the same disk as given. 526 * If there are no active disks on list, NULL is returned. 527 */ 528static __inline struct g_mirror_disk * 529g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 530{ 531 struct g_mirror_disk *dp; 532 533 for (dp = LIST_NEXT(disk, d_next); dp != disk; 534 dp = LIST_NEXT(dp, d_next)) { 535 if (dp == NULL) 536 dp = LIST_FIRST(&sc->sc_disks); 537 if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE) 538 break; 539 } 540 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 541 return (NULL); 542 return (dp); 543} 544 545static struct g_mirror_disk * 546g_mirror_get_disk(struct g_mirror_softc *sc) 547{ 548 struct g_mirror_disk *disk; 549 550 if (sc->sc_hint == NULL) { 551 sc->sc_hint = LIST_FIRST(&sc->sc_disks); 552 if (sc->sc_hint == NULL) 553 return (NULL); 554 } 555 disk = sc->sc_hint; 556 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) { 557 disk = g_mirror_find_next(sc, disk); 558 if (disk == NULL) 559 return (NULL); 560 } 561 sc->sc_hint = g_mirror_find_next(sc, disk); 562 return (disk); 563} 564 565static int 566g_mirror_write_metadata(struct g_mirror_disk *disk, 567 struct g_mirror_metadata *md) 568{ 569 struct g_mirror_softc *sc; 570 struct g_consumer *cp; 571 off_t offset, length; 572 u_char *sector; 573 int close = 0, error = 0; 574 575 g_topology_assert(); 576 577 sc = disk->d_softc; 578 cp = disk->d_consumer; 579 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name)); 580 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name)); 581 length = cp->provider->sectorsize; 582 offset = cp->provider->mediasize - length; 583 sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO); 584 /* 585 * Open consumer if it wasn't opened and remember to close it. 586 */ 587 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) { 588 error = g_access(cp, 0, 1, 1); 589 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", 590 cp->provider->name, 0, 1, 1, error); 591 if (error == 0) 592 close = 1; 593#ifdef INVARIANTS 594 } else { 595 KASSERT(cp->acw > 0 && cp->ace > 0, 596 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 597 cp->acr, cp->acw, cp->ace)); 598#endif 599 } 600 if (error == 0) { 601 if (md != NULL) 602 mirror_metadata_encode(md, sector); 603 g_topology_unlock(); 604 error = g_write_data(cp, offset, sector, length); 605 g_topology_lock(); 606 } 607 free(sector, M_MIRROR); 608 if (close) { 609 g_access(cp, 0, -1, -1); 610 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", 611 cp->provider->name, 0, -1, -1, 0); 612 } 613 if (error != 0) { 614 disk->d_softc->sc_bump_syncid = G_MIRROR_BUMP_IMMEDIATELY; 615 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 616 G_MIRROR_EVENT_DONTWAIT); 617 } 618 return (error); 619} 620 621static int 622g_mirror_clear_metadata(struct g_mirror_disk *disk) 623{ 624 int error; 625 626 g_topology_assert(); 627 error = g_mirror_write_metadata(disk, NULL); 628 if (error == 0) { 629 G_MIRROR_DEBUG(2, "Metadata on %s cleared.", 630 g_mirror_get_diskname(disk)); 631 } else { 632 G_MIRROR_DEBUG(0, 633 "Cannot clear metadata on disk %s (error=%d).", 634 g_mirror_get_diskname(disk), error); 635 } 636 return (error); 637} 638 639void 640g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk, 641 struct g_mirror_metadata *md) 642{ 643 644 strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic)); 645 md->md_version = G_MIRROR_VERSION; 646 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name)); 647 md->md_mid = sc->sc_id; 648 md->md_all = sc->sc_ndisks; 649 md->md_slice = sc->sc_slice; 650 md->md_balance = sc->sc_balance; 651 md->md_mediasize = sc->sc_mediasize; 652 md->md_sectorsize = sc->sc_sectorsize; 653 md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK); 654 bzero(md->md_provider, sizeof(md->md_provider)); 655 if (disk == NULL) { 656 md->md_did = arc4random(); 657 md->md_priority = 0; 658 md->md_syncid = 0; 659 md->md_dflags = 0; 660 md->md_sync_offset = 0; 661 } else { 662 md->md_did = disk->d_id; 663 md->md_priority = disk->d_priority; 664 md->md_syncid = disk->d_sync.ds_syncid; 665 md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK); 666 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 667 md->md_sync_offset = disk->d_sync.ds_offset_done; 668 else 669 md->md_sync_offset = 0; 670 if ((disk->d_flags & G_MIRROR_DISK_FLAG_HARDCODED) != 0) { 671 strlcpy(md->md_provider, 672 disk->d_consumer->provider->name, 673 sizeof(md->md_provider)); 674 } 675 } 676} 677 678void 679g_mirror_update_metadata(struct g_mirror_disk *disk) 680{ 681 struct g_mirror_metadata md; 682 int error; 683 684 g_topology_assert(); 685 g_mirror_fill_metadata(disk->d_softc, disk, &md); 686 error = g_mirror_write_metadata(disk, &md); 687 if (error == 0) { 688 G_MIRROR_DEBUG(2, "Metadata on %s updated.", 689 g_mirror_get_diskname(disk)); 690 } else { 691 G_MIRROR_DEBUG(0, 692 "Cannot update metadata on disk %s (error=%d).", 693 g_mirror_get_diskname(disk), error); 694 } 695} 696 697static void 698g_mirror_bump_syncid(struct g_mirror_softc *sc) 699{ 700 struct g_mirror_disk *disk; 701 702 g_topology_assert(); 703 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 704 ("%s called with no active disks (device=%s).", __func__, 705 sc->sc_name)); 706 707 sc->sc_syncid++; 708 G_MIRROR_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name, 709 sc->sc_syncid); 710 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 711 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 712 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 713 disk->d_sync.ds_syncid = sc->sc_syncid; 714 g_mirror_update_metadata(disk); 715 } 716 } 717} 718 719static void 720g_mirror_idle(struct g_mirror_softc *sc) 721{ 722 struct g_mirror_disk *disk; 723 724 if (sc->sc_provider == NULL || sc->sc_provider->acw == 0) 725 return; 726 sc->sc_idle = 1; 727 g_topology_lock(); 728 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 729 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 730 continue; 731 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.", 732 g_mirror_get_diskname(disk), sc->sc_name); 733 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 734 g_mirror_update_metadata(disk); 735 } 736 g_topology_unlock(); 737} 738 739static void 740g_mirror_unidle(struct g_mirror_softc *sc) 741{ 742 struct g_mirror_disk *disk; 743 744 sc->sc_idle = 0; 745 g_topology_lock(); 746 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 747 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 748 continue; 749 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.", 750 g_mirror_get_diskname(disk), sc->sc_name); 751 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 752 g_mirror_update_metadata(disk); 753 } 754 g_topology_unlock(); 755} 756 757static __inline int 758bintime_cmp(struct bintime *bt1, struct bintime *bt2) 759{ 760 761 if (bt1->sec < bt2->sec) 762 return (-1); 763 else if (bt1->sec > bt2->sec) 764 return (1); 765 if (bt1->frac < bt2->frac) 766 return (-1); 767 else if (bt1->frac > bt2->frac) 768 return (1); 769 return (0); 770} 771 772static void 773g_mirror_update_delay(struct g_mirror_disk *disk, struct bio *bp) 774{ 775 776 if (disk->d_softc->sc_balance != G_MIRROR_BALANCE_LOAD) 777 return; 778 binuptime(&disk->d_delay); 779 bintime_sub(&disk->d_delay, &bp->bio_t0); 780} 781 782static void 783g_mirror_done(struct bio *bp) 784{ 785 struct g_mirror_softc *sc; 786 787 sc = bp->bio_from->geom->softc; 788 bp->bio_cflags |= G_MIRROR_BIO_FLAG_REGULAR; 789 mtx_lock(&sc->sc_queue_mtx); 790 bioq_disksort(&sc->sc_queue, bp); 791 wakeup(sc); 792 mtx_unlock(&sc->sc_queue_mtx); 793} 794 795static void 796g_mirror_regular_request(struct bio *bp) 797{ 798 struct g_mirror_softc *sc; 799 struct g_mirror_disk *disk; 800 struct bio *pbp; 801 802 g_topology_assert_not(); 803 804 bp->bio_from->index--; 805 pbp = bp->bio_parent; 806 sc = pbp->bio_to->geom->softc; 807 disk = bp->bio_from->private; 808 if (disk == NULL) { 809 g_topology_lock(); 810 g_mirror_kill_consumer(sc, bp->bio_from); 811 g_topology_unlock(); 812 } else { 813 g_mirror_update_delay(disk, bp); 814 } 815 816 pbp->bio_inbed++; 817 KASSERT(pbp->bio_inbed <= pbp->bio_children, 818 ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed, 819 pbp->bio_children)); 820 if (bp->bio_error == 0 && pbp->bio_error == 0) { 821 G_MIRROR_LOGREQ(3, bp, "Request delivered."); 822 g_destroy_bio(bp); 823 if (pbp->bio_children == pbp->bio_inbed) { 824 G_MIRROR_LOGREQ(3, pbp, "Request delivered."); 825 pbp->bio_completed = pbp->bio_length; 826 g_io_deliver(pbp, pbp->bio_error); 827 } 828 return; 829 } else if (bp->bio_error != 0) { 830 if (pbp->bio_error == 0) 831 pbp->bio_error = bp->bio_error; 832 G_MIRROR_LOGREQ(0, bp, "Request failed (error=%d).", 833 bp->bio_error); 834 if (disk != NULL) { 835 sc->sc_bump_syncid = G_MIRROR_BUMP_IMMEDIATELY; 836 g_mirror_event_send(disk, 837 G_MIRROR_DISK_STATE_DISCONNECTED, 838 G_MIRROR_EVENT_DONTWAIT); 839 } 840 switch (pbp->bio_cmd) { 841 case BIO_DELETE: 842 case BIO_WRITE: 843 pbp->bio_inbed--; 844 pbp->bio_children--; 845 break; 846 } 847 } 848 g_destroy_bio(bp); 849 850 switch (pbp->bio_cmd) { 851 case BIO_READ: 852 if (pbp->bio_children == pbp->bio_inbed) { 853 pbp->bio_error = 0; 854 mtx_lock(&sc->sc_queue_mtx); 855 bioq_disksort(&sc->sc_queue, pbp); 856 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 857 wakeup(sc); 858 mtx_unlock(&sc->sc_queue_mtx); 859 } 860 break; 861 case BIO_DELETE: 862 case BIO_WRITE: 863 if (pbp->bio_children == 0) { 864 /* 865 * All requests failed. 866 */ 867 } else if (pbp->bio_inbed < pbp->bio_children) { 868 /* Do nothing. */ 869 break; 870 } else if (pbp->bio_children == pbp->bio_inbed) { 871 /* Some requests succeeded. */ 872 pbp->bio_error = 0; 873 pbp->bio_completed = pbp->bio_length; 874 } 875 g_io_deliver(pbp, pbp->bio_error); 876 break; 877 default: 878 KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd)); 879 break; 880 } 881} 882 883static void 884g_mirror_sync_done(struct bio *bp) 885{ 886 struct g_mirror_softc *sc; 887 888 G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered."); 889 sc = bp->bio_from->geom->softc; 890 bp->bio_cflags |= G_MIRROR_BIO_FLAG_SYNC; 891 mtx_lock(&sc->sc_queue_mtx); 892 bioq_disksort(&sc->sc_queue, bp); 893 wakeup(sc); 894 mtx_unlock(&sc->sc_queue_mtx); 895} 896 897static void 898g_mirror_start(struct bio *bp) 899{ 900 struct g_mirror_softc *sc; 901 902 sc = bp->bio_to->geom->softc; 903 /* 904 * If sc == NULL or there are no valid disks, provider's error 905 * should be set and g_mirror_start() should not be called at all. 906 */ 907 KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 908 ("Provider's error should be set (error=%d)(mirror=%s).", 909 bp->bio_to->error, bp->bio_to->name)); 910 G_MIRROR_LOGREQ(3, bp, "Request received."); 911 912 switch (bp->bio_cmd) { 913 case BIO_READ: 914 case BIO_WRITE: 915 case BIO_DELETE: 916 break; 917 case BIO_GETATTR: 918 default: 919 g_io_deliver(bp, EOPNOTSUPP); 920 return; 921 } 922 mtx_lock(&sc->sc_queue_mtx); 923 bioq_disksort(&sc->sc_queue, bp); 924 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 925 wakeup(sc); 926 mtx_unlock(&sc->sc_queue_mtx); 927} 928 929/* 930 * Send one synchronization request. 931 */ 932static void 933g_mirror_sync_one(struct g_mirror_disk *disk) 934{ 935 struct g_mirror_softc *sc; 936 struct bio *bp; 937 938 sc = disk->d_softc; 939 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 940 ("Disk %s is not marked for synchronization.", 941 g_mirror_get_diskname(disk))); 942 943 bp = g_new_bio(); 944 if (bp == NULL) 945 return; 946 bp->bio_parent = NULL; 947 bp->bio_cmd = BIO_READ; 948 bp->bio_offset = disk->d_sync.ds_offset; 949 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset); 950 bp->bio_cflags = 0; 951 bp->bio_done = g_mirror_sync_done; 952 bp->bio_data = disk->d_sync.ds_data; 953 if (bp->bio_data == NULL) { 954 g_destroy_bio(bp); 955 return; 956 } 957 disk->d_sync.ds_offset += bp->bio_length; 958 bp->bio_to = sc->sc_provider; 959 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 960 disk->d_sync.ds_consumer->index++; 961 g_io_request(bp, disk->d_sync.ds_consumer); 962} 963 964static void 965g_mirror_sync_request(struct bio *bp) 966{ 967 struct g_mirror_softc *sc; 968 struct g_mirror_disk *disk; 969 970 bp->bio_from->index--; 971 sc = bp->bio_from->geom->softc; 972 disk = bp->bio_from->private; 973 if (disk == NULL) { 974 g_topology_lock(); 975 g_mirror_kill_consumer(sc, bp->bio_from); 976 g_topology_unlock(); 977 g_destroy_bio(bp); 978 return; 979 } 980 981 /* 982 * Synchronization request. 983 */ 984 switch (bp->bio_cmd) { 985 case BIO_READ: 986 { 987 struct g_consumer *cp; 988 989 if (bp->bio_error != 0) { 990 G_MIRROR_LOGREQ(0, bp, 991 "Synchronization request failed (error=%d).", 992 bp->bio_error); 993 g_destroy_bio(bp); 994 return; 995 } 996 G_MIRROR_LOGREQ(3, bp, 997 "Synchronization request half-finished."); 998 bp->bio_cmd = BIO_WRITE; 999 bp->bio_cflags = 0; 1000 cp = disk->d_consumer; 1001 KASSERT(cp->acr == 0 && cp->acw == 1 && cp->ace == 1, 1002 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1003 cp->acr, cp->acw, cp->ace)); 1004 cp->index++; 1005 g_io_request(bp, cp); 1006 return; 1007 } 1008 case BIO_WRITE: 1009 { 1010 struct g_mirror_disk_sync *sync; 1011 1012 if (bp->bio_error != 0) { 1013 G_MIRROR_LOGREQ(0, bp, 1014 "Synchronization request failed (error=%d).", 1015 bp->bio_error); 1016 g_destroy_bio(bp); 1017 sc->sc_bump_syncid = G_MIRROR_BUMP_IMMEDIATELY; 1018 g_mirror_event_send(disk, 1019 G_MIRROR_DISK_STATE_DISCONNECTED, 1020 G_MIRROR_EVENT_DONTWAIT); 1021 return; 1022 } 1023 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished."); 1024 sync = &disk->d_sync; 1025 sync->ds_offset_done = bp->bio_offset + bp->bio_length; 1026 g_destroy_bio(bp); 1027 if (sync->ds_resync != -1) 1028 break; 1029 if (sync->ds_offset_done == sc->sc_provider->mediasize) { 1030 /* 1031 * Disk up-to-date, activate it. 1032 */ 1033 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE, 1034 G_MIRROR_EVENT_DONTWAIT); 1035 return; 1036 } else if (sync->ds_offset_done % (MAXPHYS * 100) == 0) { 1037 /* 1038 * Update offset_done on every 100 blocks. 1039 * XXX: This should be configurable. 1040 */ 1041 g_topology_lock(); 1042 g_mirror_update_metadata(disk); 1043 g_topology_unlock(); 1044 } 1045 return; 1046 } 1047 default: 1048 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1049 bp->bio_cmd, sc->sc_name)); 1050 break; 1051 } 1052} 1053 1054static void 1055g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp) 1056{ 1057 struct g_mirror_disk *disk; 1058 struct g_consumer *cp; 1059 struct bio *cbp; 1060 1061 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1062 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE) 1063 break; 1064 } 1065 if (disk == NULL) { 1066 if (bp->bio_error == 0) 1067 bp->bio_error = ENXIO; 1068 g_io_deliver(bp, bp->bio_error); 1069 return; 1070 } 1071 cbp = g_clone_bio(bp); 1072 if (cbp == NULL) { 1073 if (bp->bio_error == 0) 1074 bp->bio_error = ENOMEM; 1075 g_io_deliver(bp, bp->bio_error); 1076 return; 1077 } 1078 /* 1079 * Fill in the component buf structure. 1080 */ 1081 cp = disk->d_consumer; 1082 cbp->bio_done = g_mirror_done; 1083 cbp->bio_to = cp->provider; 1084 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1085 KASSERT(cp->acr > 0 && cp->ace > 0, 1086 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1087 cp->acw, cp->ace)); 1088 cp->index++; 1089 g_io_request(cbp, cp); 1090} 1091 1092static void 1093g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp) 1094{ 1095 struct g_mirror_disk *disk; 1096 struct g_consumer *cp; 1097 struct bio *cbp; 1098 1099 disk = g_mirror_get_disk(sc); 1100 if (disk == NULL) { 1101 if (bp->bio_error == 0) 1102 bp->bio_error = ENXIO; 1103 g_io_deliver(bp, bp->bio_error); 1104 return; 1105 } 1106 cbp = g_clone_bio(bp); 1107 if (cbp == NULL) { 1108 if (bp->bio_error == 0) 1109 bp->bio_error = ENOMEM; 1110 g_io_deliver(bp, bp->bio_error); 1111 return; 1112 } 1113 /* 1114 * Fill in the component buf structure. 1115 */ 1116 cp = disk->d_consumer; 1117 cbp->bio_done = g_mirror_done; 1118 cbp->bio_to = cp->provider; 1119 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1120 KASSERT(cp->acr > 0 && cp->ace > 0, 1121 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1122 cp->acw, cp->ace)); 1123 cp->index++; 1124 g_io_request(cbp, cp); 1125} 1126 1127static void 1128g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp) 1129{ 1130 struct g_mirror_disk *disk, *dp; 1131 struct g_consumer *cp; 1132 struct bio *cbp; 1133 struct bintime curtime; 1134 1135 binuptime(&curtime); 1136 /* 1137 * Find a disk which the smallest load. 1138 */ 1139 disk = NULL; 1140 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1141 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1142 continue; 1143 /* If disk wasn't used for more than 2 sec, use it. */ 1144 if (curtime.sec - dp->d_last_used.sec >= 2) { 1145 disk = dp; 1146 break; 1147 } 1148 if (disk == NULL || 1149 bintime_cmp(&dp->d_delay, &disk->d_delay) < 0) { 1150 disk = dp; 1151 } 1152 } 1153 cbp = g_clone_bio(bp); 1154 if (cbp == NULL) { 1155 if (bp->bio_error == 0) 1156 bp->bio_error = ENOMEM; 1157 g_io_deliver(bp, bp->bio_error); 1158 return; 1159 } 1160 /* 1161 * Fill in the component buf structure. 1162 */ 1163 cp = disk->d_consumer; 1164 cbp->bio_done = g_mirror_done; 1165 cbp->bio_to = cp->provider; 1166 binuptime(&disk->d_last_used); 1167 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1168 KASSERT(cp->acr > 0 && cp->ace > 0, 1169 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1170 cp->acw, cp->ace)); 1171 cp->index++; 1172 g_io_request(cbp, cp); 1173} 1174 1175static void 1176g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp) 1177{ 1178 struct bio_queue_head queue; 1179 struct g_mirror_disk *disk; 1180 struct g_consumer *cp; 1181 struct bio *cbp; 1182 off_t left, mod, offset, slice; 1183 u_char *data; 1184 u_int ndisks; 1185 1186 if (bp->bio_length <= sc->sc_slice) { 1187 g_mirror_request_round_robin(sc, bp); 1188 return; 1189 } 1190 ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE); 1191 slice = bp->bio_length / ndisks; 1192 mod = slice % sc->sc_provider->sectorsize; 1193 if (mod != 0) 1194 slice += sc->sc_provider->sectorsize - mod; 1195 /* 1196 * Allocate all bios before sending any request, so we can 1197 * return ENOMEM in nice and clean way. 1198 */ 1199 left = bp->bio_length; 1200 offset = bp->bio_offset; 1201 data = bp->bio_data; 1202 bioq_init(&queue); 1203 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1204 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1205 continue; 1206 cbp = g_clone_bio(bp); 1207 if (cbp == NULL) { 1208 for (cbp = bioq_first(&queue); cbp != NULL; 1209 cbp = bioq_first(&queue)) { 1210 bioq_remove(&queue, cbp); 1211 g_destroy_bio(cbp); 1212 } 1213 if (bp->bio_error == 0) 1214 bp->bio_error = ENOMEM; 1215 g_io_deliver(bp, bp->bio_error); 1216 return; 1217 } 1218 bioq_insert_tail(&queue, cbp); 1219 cbp->bio_done = g_mirror_done; 1220 cbp->bio_caller1 = disk; 1221 cbp->bio_to = disk->d_consumer->provider; 1222 cbp->bio_offset = offset; 1223 cbp->bio_data = data; 1224 cbp->bio_length = MIN(left, slice); 1225 left -= cbp->bio_length; 1226 if (left == 0) 1227 break; 1228 offset += cbp->bio_length; 1229 data += cbp->bio_length; 1230 } 1231 for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) { 1232 bioq_remove(&queue, cbp); 1233 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1234 disk = cbp->bio_caller1; 1235 cbp->bio_caller1 = NULL; 1236 cp = disk->d_consumer; 1237 KASSERT(cp->acr > 0 && cp->ace > 0, 1238 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1239 cp->acr, cp->acw, cp->ace)); 1240 disk->d_consumer->index++; 1241 g_io_request(cbp, disk->d_consumer); 1242 } 1243} 1244 1245static void 1246g_mirror_register_request(struct bio *bp) 1247{ 1248 struct g_mirror_softc *sc; 1249 1250 sc = bp->bio_to->geom->softc; 1251 switch (bp->bio_cmd) { 1252 case BIO_READ: 1253 switch (sc->sc_balance) { 1254 case G_MIRROR_BALANCE_LOAD: 1255 g_mirror_request_load(sc, bp); 1256 break; 1257 case G_MIRROR_BALANCE_PREFER: 1258 g_mirror_request_prefer(sc, bp); 1259 break; 1260 case G_MIRROR_BALANCE_ROUND_ROBIN: 1261 g_mirror_request_round_robin(sc, bp); 1262 break; 1263 case G_MIRROR_BALANCE_SPLIT: 1264 g_mirror_request_split(sc, bp); 1265 break; 1266 } 1267 return; 1268 case BIO_WRITE: 1269 case BIO_DELETE: 1270 { 1271 struct g_mirror_disk *disk; 1272 struct g_mirror_disk_sync *sync; 1273 struct bio_queue_head queue; 1274 struct g_consumer *cp; 1275 struct bio *cbp; 1276 1277 if (sc->sc_idle) 1278 g_mirror_unidle(sc); 1279 /* 1280 * Allocate all bios before sending any request, so we can 1281 * return ENOMEM in nice and clean way. 1282 */ 1283 bioq_init(&queue); 1284 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1285 sync = &disk->d_sync; 1286 switch (disk->d_state) { 1287 case G_MIRROR_DISK_STATE_ACTIVE: 1288 break; 1289 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 1290 if (bp->bio_offset >= sync->ds_offset) 1291 continue; 1292 else if (bp->bio_offset + bp->bio_length > 1293 sync->ds_offset_done && 1294 (bp->bio_offset < sync->ds_resync || 1295 sync->ds_resync == -1)) { 1296 sync->ds_resync = bp->bio_offset - 1297 (bp->bio_offset % MAXPHYS); 1298 } 1299 break; 1300 default: 1301 continue; 1302 } 1303 cbp = g_clone_bio(bp); 1304 if (cbp == NULL) { 1305 for (cbp = bioq_first(&queue); cbp != NULL; 1306 cbp = bioq_first(&queue)) { 1307 bioq_remove(&queue, cbp); 1308 g_destroy_bio(cbp); 1309 } 1310 if (bp->bio_error == 0) 1311 bp->bio_error = ENOMEM; 1312 g_io_deliver(bp, bp->bio_error); 1313 return; 1314 } 1315 bioq_insert_tail(&queue, cbp); 1316 cbp->bio_done = g_mirror_done; 1317 cp = disk->d_consumer; 1318 cbp->bio_caller1 = cp; 1319 cbp->bio_to = cp->provider; 1320 KASSERT(cp->acw > 0 && cp->ace > 0, 1321 ("Consumer %s not opened (r%dw%de%d).", 1322 cp->provider->name, cp->acr, cp->acw, cp->ace)); 1323 } 1324 for (cbp = bioq_first(&queue); cbp != NULL; 1325 cbp = bioq_first(&queue)) { 1326 bioq_remove(&queue, cbp); 1327 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1328 cp = cbp->bio_caller1; 1329 cbp->bio_caller1 = NULL; 1330 cp->index++; 1331 g_io_request(cbp, cp); 1332 } 1333 /* 1334 * Bump syncid on first write. 1335 */ 1336 if (sc->sc_bump_syncid == G_MIRROR_BUMP_ON_FIRST_WRITE) { 1337 sc->sc_bump_syncid = 0; 1338 g_topology_lock(); 1339 g_mirror_bump_syncid(sc); 1340 g_topology_unlock(); 1341 } 1342 return; 1343 } 1344 default: 1345 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1346 bp->bio_cmd, sc->sc_name)); 1347 break; 1348 } 1349} 1350 1351static int 1352g_mirror_can_destroy(struct g_mirror_softc *sc) 1353{ 1354 struct g_geom *gp; 1355 struct g_consumer *cp; 1356 1357 g_topology_assert(); 1358 gp = sc->sc_geom; 1359 LIST_FOREACH(cp, &gp->consumer, consumer) { 1360 if (g_mirror_is_busy(sc, cp)) 1361 return (0); 1362 } 1363 gp = sc->sc_sync.ds_geom; 1364 LIST_FOREACH(cp, &gp->consumer, consumer) { 1365 if (g_mirror_is_busy(sc, cp)) 1366 return (0); 1367 } 1368 G_MIRROR_DEBUG(2, "No I/O requests for %s, it can be destroyed.", 1369 sc->sc_name); 1370 return (1); 1371} 1372 1373static int 1374g_mirror_try_destroy(struct g_mirror_softc *sc) 1375{ 1376 1377 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WAIT) != 0) { 1378 g_topology_lock(); 1379 if (!g_mirror_can_destroy(sc)) { 1380 g_topology_unlock(); 1381 return (0); 1382 } 1383 g_topology_unlock(); 1384 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1385 &sc->sc_worker); 1386 wakeup(&sc->sc_worker); 1387 sc->sc_worker = NULL; 1388 } else { 1389 g_topology_lock(); 1390 if (!g_mirror_can_destroy(sc)) { 1391 g_topology_unlock(); 1392 return (0); 1393 } 1394 g_mirror_destroy_device(sc); 1395 g_topology_unlock(); 1396 free(sc, M_MIRROR); 1397 } 1398 return (1); 1399} 1400 1401/* 1402 * Worker thread. 1403 */ 1404static void 1405g_mirror_worker(void *arg) 1406{ 1407 struct g_mirror_softc *sc; 1408 struct g_mirror_disk *disk; 1409 struct g_mirror_disk_sync *sync; 1410 struct g_mirror_event *ep; 1411 struct bio *bp; 1412 u_int nreqs; 1413 1414 sc = arg; 1415 curthread->td_base_pri = PRIBIO; 1416 1417 nreqs = 0; 1418 for (;;) { 1419 G_MIRROR_DEBUG(5, "%s: Let's see...", __func__); 1420 /* 1421 * First take a look at events. 1422 * This is important to handle events before any I/O requests. 1423 */ 1424 ep = g_mirror_event_get(sc); 1425 if (ep != NULL) { 1426 g_topology_lock(); 1427 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) { 1428 /* Update only device status. */ 1429 G_MIRROR_DEBUG(3, 1430 "Running event for device %s.", 1431 sc->sc_name); 1432 ep->e_error = 0; 1433 g_mirror_update_device(sc, 1); 1434 } else { 1435 /* Update disk status. */ 1436 G_MIRROR_DEBUG(3, "Running event for disk %s.", 1437 g_mirror_get_diskname(ep->e_disk)); 1438 ep->e_error = g_mirror_update_disk(ep->e_disk, 1439 ep->e_state); 1440 if (ep->e_error == 0) 1441 g_mirror_update_device(sc, 0); 1442 } 1443 g_topology_unlock(); 1444 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) { 1445 KASSERT(ep->e_error == 0, 1446 ("Error cannot be handled.")); 1447 g_mirror_event_free(ep); 1448 } else { 1449 ep->e_flags |= G_MIRROR_EVENT_DONE; 1450 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1451 ep); 1452 mtx_lock(&sc->sc_events_mtx); 1453 wakeup(ep); 1454 mtx_unlock(&sc->sc_events_mtx); 1455 } 1456 if ((sc->sc_flags & 1457 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1458 if (g_mirror_try_destroy(sc)) 1459 kthread_exit(0); 1460 } 1461 G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__); 1462 continue; 1463 } 1464 /* 1465 * Now I/O requests. 1466 */ 1467 /* Get first request from the queue. */ 1468 mtx_lock(&sc->sc_queue_mtx); 1469 bp = bioq_first(&sc->sc_queue); 1470 if (bp == NULL) { 1471 if ((sc->sc_flags & 1472 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1473 mtx_unlock(&sc->sc_queue_mtx); 1474 if (g_mirror_try_destroy(sc)) 1475 kthread_exit(0); 1476 mtx_lock(&sc->sc_queue_mtx); 1477 } 1478 } 1479 if (sc->sc_sync.ds_ndisks > 0 && 1480 (bp == NULL || nreqs > g_mirror_reqs_per_sync)) { 1481 mtx_unlock(&sc->sc_queue_mtx); 1482 /* 1483 * It is time for synchronization... 1484 */ 1485 nreqs = 0; 1486 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1487 if (disk->d_state != 1488 G_MIRROR_DISK_STATE_SYNCHRONIZING) { 1489 continue; 1490 } 1491 sync = &disk->d_sync; 1492 if (sync->ds_offset >= 1493 sc->sc_provider->mediasize) { 1494 continue; 1495 } 1496 if (sync->ds_offset > sync->ds_offset_done) 1497 continue; 1498 if (sync->ds_resync != -1) { 1499 sync->ds_offset = sync->ds_resync; 1500 sync->ds_offset_done = sync->ds_resync; 1501 sync->ds_resync = -1; 1502 } 1503 g_mirror_sync_one(disk); 1504 } 1505 G_MIRROR_DEBUG(5, "%s: I'm here 2.", __func__); 1506 goto sleep; 1507 } 1508 if (bp == NULL) { 1509#define G_MIRROR_IS_IDLE(sc) ((sc)->sc_idle || \ 1510 ((sc)->sc_provider != NULL && \ 1511 (sc)->sc_provider->acw == 0)) 1512 if (G_MIRROR_IS_IDLE(sc)) { 1513 /* 1514 * If we're already in idle state, sleep without 1515 * a timeout. 1516 */ 1517 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, 1518 "m:w1", 0); 1519 G_MIRROR_DEBUG(5, "%s: I'm here 3.", __func__); 1520 } else { 1521 u_int idletime; 1522 1523 idletime = g_mirror_idletime; 1524 if (idletime == 0) 1525 idletime = 1; 1526 idletime *= hz; 1527 if (msleep(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, 1528 "m:w2", idletime) == EWOULDBLOCK) { 1529 G_MIRROR_DEBUG(5, "%s: I'm here 4.", 1530 __func__); 1531 /* 1532 * No I/O requests in 5 seconds, so mark 1533 * components as clean. 1534 */ 1535 g_mirror_idle(sc); 1536 } 1537 G_MIRROR_DEBUG(5, "%s: I'm here 5.", __func__); 1538 } 1539 continue; 1540 } 1541 nreqs++; 1542 bioq_remove(&sc->sc_queue, bp); 1543 mtx_unlock(&sc->sc_queue_mtx); 1544 1545 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0) { 1546 g_mirror_regular_request(bp); 1547 } else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) { 1548 u_int timeout, sps; 1549 1550 g_mirror_sync_request(bp); 1551sleep: 1552 sps = g_mirror_syncs_per_sec; 1553 if (sps == 0) { 1554 G_MIRROR_DEBUG(5, "%s: I'm here 6.", __func__); 1555 continue; 1556 } 1557 mtx_lock(&sc->sc_queue_mtx); 1558 if (bioq_first(&sc->sc_queue) != NULL) { 1559 mtx_unlock(&sc->sc_queue_mtx); 1560 G_MIRROR_DEBUG(5, "%s: I'm here 7.", __func__); 1561 continue; 1562 } 1563 timeout = hz / sps; 1564 if (timeout == 0) 1565 timeout = 1; 1566 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w3", 1567 timeout); 1568 } else { 1569 g_mirror_register_request(bp); 1570 } 1571 G_MIRROR_DEBUG(5, "%s: I'm here 8.", __func__); 1572 } 1573} 1574 1575/* 1576 * Open disk's consumer if needed. 1577 */ 1578static void 1579g_mirror_update_access(struct g_mirror_disk *disk) 1580{ 1581 struct g_provider *pp; 1582 struct g_consumer *cp; 1583 int acr, acw, ace, cpw, error; 1584 1585 g_topology_assert(); 1586 1587 cp = disk->d_consumer; 1588 pp = disk->d_softc->sc_provider; 1589 if (pp == NULL) { 1590 acr = -cp->acr; 1591 acw = -cp->acw; 1592 ace = -cp->ace; 1593 } else { 1594 acr = pp->acr - cp->acr; 1595 acw = pp->acw - cp->acw; 1596 ace = pp->ace - cp->ace; 1597 /* Grab an extra "exclusive" bit. */ 1598 if (pp->acr > 0 || pp->acw > 0 || pp->ace > 0) 1599 ace++; 1600 } 1601 if (acr == 0 && acw == 0 && ace == 0) 1602 return; 1603 cpw = cp->acw; 1604 error = g_access(cp, acr, acw, ace); 1605 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", cp->provider->name, acr, 1606 acw, ace, error); 1607 if (error != 0) { 1608 disk->d_softc->sc_bump_syncid = G_MIRROR_BUMP_ON_FIRST_WRITE; 1609 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 1610 G_MIRROR_EVENT_DONTWAIT); 1611 return; 1612 } 1613 if (cpw == 0 && cp->acw > 0) { 1614 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.", 1615 g_mirror_get_diskname(disk), disk->d_softc->sc_name); 1616 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1617 } else if (cpw > 0 && cp->acw == 0) { 1618 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.", 1619 g_mirror_get_diskname(disk), disk->d_softc->sc_name); 1620 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 1621 } 1622} 1623 1624static void 1625g_mirror_sync_start(struct g_mirror_disk *disk) 1626{ 1627 struct g_mirror_softc *sc; 1628 struct g_consumer *cp; 1629 int error; 1630 1631 g_topology_assert(); 1632 1633 sc = disk->d_softc; 1634 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1635 ("Device not in RUNNING state (%s, %u).", sc->sc_name, 1636 sc->sc_state)); 1637 cp = disk->d_consumer; 1638 KASSERT(cp->acr == 0 && cp->acw == 0 && cp->ace == 0, 1639 ("Consumer %s already opened.", cp->provider->name)); 1640 1641 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name, 1642 g_mirror_get_diskname(disk)); 1643 error = g_access(cp, 0, 1, 1); 1644 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", cp->provider->name, 0, 1, 1645 1, error); 1646 if (error != 0) { 1647 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 1648 G_MIRROR_EVENT_DONTWAIT); 1649 return; 1650 } 1651 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1652 KASSERT(disk->d_sync.ds_consumer == NULL, 1653 ("Sync consumer already exists (device=%s, disk=%s).", 1654 sc->sc_name, g_mirror_get_diskname(disk))); 1655 disk->d_sync.ds_consumer = g_new_consumer(sc->sc_sync.ds_geom); 1656 disk->d_sync.ds_consumer->private = disk; 1657 disk->d_sync.ds_consumer->index = 0; 1658 error = g_attach(disk->d_sync.ds_consumer, disk->d_softc->sc_provider); 1659 KASSERT(error == 0, ("Cannot attach to %s (error=%d).", 1660 disk->d_softc->sc_name, error)); 1661 error = g_access(disk->d_sync.ds_consumer, 1, 0, 0); 1662 KASSERT(error == 0, ("Cannot open %s (error=%d).", 1663 disk->d_softc->sc_name, error)); 1664 disk->d_sync.ds_data = malloc(MAXPHYS, M_MIRROR, M_WAITOK); 1665 sc->sc_sync.ds_ndisks++; 1666} 1667 1668/* 1669 * Stop synchronization process. 1670 * type: 0 - synchronization finished 1671 * 1 - synchronization stopped 1672 */ 1673static void 1674g_mirror_sync_stop(struct g_mirror_disk *disk, int type) 1675{ 1676 struct g_consumer *cp; 1677 1678 g_topology_assert(); 1679 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 1680 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 1681 g_mirror_disk_state2str(disk->d_state))); 1682 if (disk->d_sync.ds_consumer == NULL) 1683 return; 1684 1685 if (type == 0) { 1686 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.", 1687 disk->d_softc->sc_name, g_mirror_get_diskname(disk)); 1688 } else /* if (type == 1) */ { 1689 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.", 1690 disk->d_softc->sc_name, g_mirror_get_diskname(disk)); 1691 } 1692 cp = disk->d_sync.ds_consumer; 1693 g_access(cp, -1, 0, 0); 1694 g_mirror_kill_consumer(disk->d_softc, cp); 1695 free(disk->d_sync.ds_data, M_MIRROR); 1696 disk->d_sync.ds_consumer = NULL; 1697 disk->d_softc->sc_sync.ds_ndisks--; 1698 cp = disk->d_consumer; 1699 KASSERT(cp->acr == 0 && cp->acw == 1 && cp->ace == 1, 1700 ("Consumer %s not opened.", cp->provider->name)); 1701 g_access(cp, 0, -1, -1); 1702 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", cp->provider->name, 0, -1, 1703 -1, 0); 1704 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 1705} 1706 1707static void 1708g_mirror_launch_provider(struct g_mirror_softc *sc) 1709{ 1710 struct g_mirror_disk *disk; 1711 struct g_provider *pp; 1712 1713 g_topology_assert(); 1714 1715 pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name); 1716 pp->mediasize = sc->sc_mediasize; 1717 pp->sectorsize = sc->sc_sectorsize; 1718 sc->sc_provider = pp; 1719 g_error_provider(pp, 0); 1720 G_MIRROR_DEBUG(0, "Device %s: provider %s launched.", sc->sc_name, 1721 pp->name); 1722 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1723 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 1724 g_mirror_sync_start(disk); 1725 } 1726} 1727 1728static void 1729g_mirror_destroy_provider(struct g_mirror_softc *sc) 1730{ 1731 struct g_mirror_disk *disk; 1732 struct bio *bp; 1733 1734 g_topology_assert(); 1735 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).", 1736 sc->sc_name)); 1737 1738 g_error_provider(sc->sc_provider, ENXIO); 1739 mtx_lock(&sc->sc_queue_mtx); 1740 while ((bp = bioq_first(&sc->sc_queue)) != NULL) { 1741 bioq_remove(&sc->sc_queue, bp); 1742 g_io_deliver(bp, ENXIO); 1743 } 1744 mtx_unlock(&sc->sc_queue_mtx); 1745 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", sc->sc_name, 1746 sc->sc_provider->name); 1747 sc->sc_provider->flags |= G_PF_WITHER; 1748 g_orphan_provider(sc->sc_provider, ENXIO); 1749 sc->sc_provider = NULL; 1750 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1751 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 1752 g_mirror_sync_stop(disk, 1); 1753 } 1754} 1755 1756static void 1757g_mirror_go(void *arg) 1758{ 1759 struct g_mirror_softc *sc; 1760 1761 sc = arg; 1762 G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name); 1763 g_mirror_event_send(sc, 0, 1764 G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE); 1765} 1766 1767static u_int 1768g_mirror_determine_state(struct g_mirror_disk *disk) 1769{ 1770 struct g_mirror_softc *sc; 1771 u_int state; 1772 1773 sc = disk->d_softc; 1774 if (sc->sc_syncid == disk->d_sync.ds_syncid) { 1775 if ((disk->d_flags & 1776 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 1777 /* Disk does not need synchronization. */ 1778 state = G_MIRROR_DISK_STATE_ACTIVE; 1779 } else { 1780 if ((sc->sc_flags & 1781 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 1782 (disk->d_flags & 1783 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 1784 /* 1785 * We can start synchronization from 1786 * the stored offset. 1787 */ 1788 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 1789 } else { 1790 state = G_MIRROR_DISK_STATE_STALE; 1791 } 1792 } 1793 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) { 1794 /* 1795 * Reset all synchronization data for this disk, 1796 * because if it even was synchronized, it was 1797 * synchronized to disks with different syncid. 1798 */ 1799 disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING; 1800 disk->d_sync.ds_offset = 0; 1801 disk->d_sync.ds_offset_done = 0; 1802 disk->d_sync.ds_syncid = sc->sc_syncid; 1803 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 1804 (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 1805 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 1806 } else { 1807 state = G_MIRROR_DISK_STATE_STALE; 1808 } 1809 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ { 1810 /* 1811 * Not good, NOT GOOD! 1812 * It means that mirror was started on stale disks 1813 * and more fresh disk just arrive. 1814 * If there were writes, mirror is fucked up, sorry. 1815 * I think the best choice here is don't touch 1816 * this disk and inform the user laudly. 1817 */ 1818 G_MIRROR_DEBUG(0, "Device %s was started before the freshest " 1819 "disk (%s) arrives!! It will not be connected to the " 1820 "running device.", sc->sc_name, 1821 g_mirror_get_diskname(disk)); 1822 g_mirror_destroy_disk(disk); 1823 state = G_MIRROR_DISK_STATE_NONE; 1824 /* Return immediately, because disk was destroyed. */ 1825 return (state); 1826 } 1827 G_MIRROR_DEBUG(3, "State for %s disk: %s.", 1828 g_mirror_get_diskname(disk), g_mirror_disk_state2str(state)); 1829 return (state); 1830} 1831 1832/* 1833 * Update device state. 1834 */ 1835static void 1836g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force) 1837{ 1838 struct g_mirror_disk *disk; 1839 u_int state; 1840 1841 g_topology_assert(); 1842 1843 switch (sc->sc_state) { 1844 case G_MIRROR_DEVICE_STATE_STARTING: 1845 { 1846 struct g_mirror_disk *pdisk; 1847 u_int dirty, ndisks, syncid; 1848 1849 KASSERT(sc->sc_provider == NULL, 1850 ("Non-NULL provider in STARTING state (%s).", sc->sc_name)); 1851 /* 1852 * Are we ready? We are, if all disks are connected or 1853 * if we have any disks and 'force' is true. 1854 */ 1855 if ((force && g_mirror_ndisks(sc, -1) > 0) || 1856 sc->sc_ndisks == g_mirror_ndisks(sc, -1)) { 1857 ; 1858 } else if (g_mirror_ndisks(sc, -1) == 0) { 1859 /* 1860 * Disks went down in starting phase, so destroy 1861 * device. 1862 */ 1863 callout_drain(&sc->sc_callout); 1864 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 1865 return; 1866 } else { 1867 return; 1868 } 1869 1870 /* 1871 * Activate all disks with the biggest syncid. 1872 */ 1873 if (force) { 1874 /* 1875 * If 'force' is true, we have been called due to 1876 * timeout, so don't bother canceling timeout. 1877 */ 1878 ndisks = 0; 1879 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1880 if ((disk->d_flags & 1881 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 1882 ndisks++; 1883 } 1884 } 1885 if (ndisks == 0) { 1886 /* No valid disks found, destroy device. */ 1887 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 1888 return; 1889 } 1890 } else { 1891 /* Cancel timeout. */ 1892 callout_drain(&sc->sc_callout); 1893 } 1894 1895 /* 1896 * Find disk with the biggest syncid. 1897 */ 1898 syncid = 0; 1899 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1900 if (disk->d_sync.ds_syncid > syncid) 1901 syncid = disk->d_sync.ds_syncid; 1902 } 1903 1904 /* 1905 * Here we need to look for dirty disks and if all disks 1906 * with the biggest syncid are dirty, we have to choose 1907 * one with the biggest priority and rebuild the rest. 1908 */ 1909 /* 1910 * Find the number of dirty disks with the biggest syncid. 1911 * Find the number of disks with the biggest syncid. 1912 * While here, find a disk with the biggest priority. 1913 */ 1914 dirty = ndisks = 0; 1915 pdisk = NULL; 1916 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1917 if (disk->d_sync.ds_syncid != syncid) 1918 continue; 1919 if ((disk->d_flags & 1920 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 1921 continue; 1922 } 1923 ndisks++; 1924 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 1925 dirty++; 1926 if (pdisk == NULL || 1927 pdisk->d_priority < disk->d_priority) { 1928 pdisk = disk; 1929 } 1930 } 1931 } 1932 if (dirty == 0) { 1933 /* No dirty disks at all, great. */ 1934 } else if (dirty == ndisks) { 1935 /* 1936 * Force synchronization for all dirty disks except one 1937 * with the biggest priority. 1938 */ 1939 KASSERT(pdisk != NULL, ("pdisk == NULL")); 1940 G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a " 1941 "master disk for synchronization.", 1942 g_mirror_get_diskname(pdisk), sc->sc_name); 1943 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1944 if (disk->d_sync.ds_syncid != syncid) 1945 continue; 1946 if ((disk->d_flags & 1947 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 1948 continue; 1949 } 1950 KASSERT((disk->d_flags & 1951 G_MIRROR_DISK_FLAG_DIRTY) != 0, 1952 ("Disk %s isn't marked as dirty.", 1953 g_mirror_get_diskname(disk))); 1954 /* Skip the disk with the biggest priority. */ 1955 if (disk == pdisk) 1956 continue; 1957 disk->d_sync.ds_syncid = 0; 1958 } 1959 } else if (dirty < ndisks) { 1960 /* 1961 * Force synchronization for all dirty disks. 1962 * We have some non-dirty disks. 1963 */ 1964 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1965 if (disk->d_sync.ds_syncid != syncid) 1966 continue; 1967 if ((disk->d_flags & 1968 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 1969 continue; 1970 } 1971 if ((disk->d_flags & 1972 G_MIRROR_DISK_FLAG_DIRTY) == 0) { 1973 continue; 1974 } 1975 disk->d_sync.ds_syncid = 0; 1976 } 1977 } 1978 1979 /* Reset hint. */ 1980 sc->sc_hint = NULL; 1981 sc->sc_syncid = syncid; 1982 if (force) { 1983 /* Remember to bump syncid on first write. */ 1984 sc->sc_bump_syncid = G_MIRROR_BUMP_ON_FIRST_WRITE; 1985 } 1986 state = G_MIRROR_DEVICE_STATE_RUNNING; 1987 G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.", 1988 sc->sc_name, g_mirror_device_state2str(sc->sc_state), 1989 g_mirror_device_state2str(state)); 1990 sc->sc_state = state; 1991 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1992 state = g_mirror_determine_state(disk); 1993 g_mirror_event_send(disk, state, 1994 G_MIRROR_EVENT_DONTWAIT); 1995 if (state == G_MIRROR_DISK_STATE_STALE) { 1996 sc->sc_bump_syncid = 1997 G_MIRROR_BUMP_ON_FIRST_WRITE; 1998 } 1999 } 2000 wakeup(&g_mirror_class); 2001 break; 2002 } 2003 case G_MIRROR_DEVICE_STATE_RUNNING: 2004 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 && 2005 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2006 /* 2007 * No active disks or no disks at all, 2008 * so destroy device. 2009 */ 2010 if (sc->sc_provider != NULL) 2011 g_mirror_destroy_provider(sc); 2012 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2013 break; 2014 } else if (g_mirror_ndisks(sc, 2015 G_MIRROR_DISK_STATE_ACTIVE) > 0 && 2016 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2017 /* 2018 * We have active disks, launch provider if it doesn't 2019 * exist. 2020 */ 2021 if (sc->sc_provider == NULL) 2022 g_mirror_launch_provider(sc); 2023 } 2024 /* 2025 * Bump syncid here, if we need to do it immediately. 2026 */ 2027 if (sc->sc_bump_syncid == G_MIRROR_BUMP_IMMEDIATELY) { 2028 sc->sc_bump_syncid = 0; 2029 g_mirror_bump_syncid(sc); 2030 } 2031 break; 2032 default: 2033 KASSERT(1 == 0, ("Wrong device state (%s, %s).", 2034 sc->sc_name, g_mirror_device_state2str(sc->sc_state))); 2035 break; 2036 } 2037} 2038 2039/* 2040 * Update disk state and device state if needed. 2041 */ 2042#define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \ 2043 "Disk %s state changed from %s to %s (device %s).", \ 2044 g_mirror_get_diskname(disk), \ 2045 g_mirror_disk_state2str(disk->d_state), \ 2046 g_mirror_disk_state2str(state), sc->sc_name) 2047static int 2048g_mirror_update_disk(struct g_mirror_disk *disk, u_int state) 2049{ 2050 struct g_mirror_softc *sc; 2051 2052 g_topology_assert(); 2053 2054 sc = disk->d_softc; 2055again: 2056 G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.", 2057 g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state), 2058 g_mirror_disk_state2str(state)); 2059 switch (state) { 2060 case G_MIRROR_DISK_STATE_NEW: 2061 /* 2062 * Possible scenarios: 2063 * 1. New disk arrive. 2064 */ 2065 /* Previous state should be NONE. */ 2066 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE, 2067 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2068 g_mirror_disk_state2str(disk->d_state))); 2069 DISK_STATE_CHANGED(); 2070 2071 disk->d_state = state; 2072 if (LIST_EMPTY(&sc->sc_disks)) 2073 LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next); 2074 else { 2075 struct g_mirror_disk *dp; 2076 2077 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 2078 if (disk->d_priority >= dp->d_priority) { 2079 LIST_INSERT_BEFORE(dp, disk, d_next); 2080 dp = NULL; 2081 break; 2082 } 2083 if (LIST_NEXT(dp, d_next) == NULL) 2084 break; 2085 } 2086 if (dp != NULL) 2087 LIST_INSERT_AFTER(dp, disk, d_next); 2088 } 2089 G_MIRROR_DEBUG(0, "Device %s: provider %s detected.", 2090 sc->sc_name, g_mirror_get_diskname(disk)); 2091 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 2092 break; 2093 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2094 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2095 g_mirror_device_state2str(sc->sc_state), 2096 g_mirror_get_diskname(disk), 2097 g_mirror_disk_state2str(disk->d_state))); 2098 state = g_mirror_determine_state(disk); 2099 if (state != G_MIRROR_DISK_STATE_NONE) 2100 goto again; 2101 break; 2102 case G_MIRROR_DISK_STATE_ACTIVE: 2103 /* 2104 * Possible scenarios: 2105 * 1. New disk does not need synchronization. 2106 * 2. Synchronization process finished successfully. 2107 */ 2108 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2109 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2110 g_mirror_device_state2str(sc->sc_state), 2111 g_mirror_get_diskname(disk), 2112 g_mirror_disk_state2str(disk->d_state))); 2113 /* Previous state should be NEW or SYNCHRONIZING. */ 2114 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW || 2115 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2116 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2117 g_mirror_disk_state2str(disk->d_state))); 2118 DISK_STATE_CHANGED(); 2119 2120 if (disk->d_state == G_MIRROR_DISK_STATE_NEW) 2121 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2122 else if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2123 disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2124 disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC; 2125 g_mirror_sync_stop(disk, 0); 2126 } 2127 disk->d_state = state; 2128 disk->d_sync.ds_offset = 0; 2129 disk->d_sync.ds_offset_done = 0; 2130 g_mirror_update_access(disk); 2131 g_mirror_update_metadata(disk); 2132 G_MIRROR_DEBUG(0, "Device %s: provider %s activated.", 2133 sc->sc_name, g_mirror_get_diskname(disk)); 2134 break; 2135 case G_MIRROR_DISK_STATE_STALE: 2136 /* 2137 * Possible scenarios: 2138 * 1. Stale disk was connected. 2139 */ 2140 /* Previous state should be NEW. */ 2141 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2142 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2143 g_mirror_disk_state2str(disk->d_state))); 2144 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2145 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2146 g_mirror_device_state2str(sc->sc_state), 2147 g_mirror_get_diskname(disk), 2148 g_mirror_disk_state2str(disk->d_state))); 2149 /* 2150 * STALE state is only possible if device is marked 2151 * NOAUTOSYNC. 2152 */ 2153 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0, 2154 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2155 g_mirror_device_state2str(sc->sc_state), 2156 g_mirror_get_diskname(disk), 2157 g_mirror_disk_state2str(disk->d_state))); 2158 DISK_STATE_CHANGED(); 2159 2160 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2161 disk->d_state = state; 2162 g_mirror_update_metadata(disk); 2163 G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.", 2164 sc->sc_name, g_mirror_get_diskname(disk)); 2165 break; 2166 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 2167 /* 2168 * Possible scenarios: 2169 * 1. Disk which needs synchronization was connected. 2170 */ 2171 /* Previous state should be NEW. */ 2172 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2173 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2174 g_mirror_disk_state2str(disk->d_state))); 2175 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2176 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2177 g_mirror_device_state2str(sc->sc_state), 2178 g_mirror_get_diskname(disk), 2179 g_mirror_disk_state2str(disk->d_state))); 2180 DISK_STATE_CHANGED(); 2181 2182 if (disk->d_state == G_MIRROR_DISK_STATE_NEW) 2183 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2184 disk->d_state = state; 2185 if (sc->sc_provider != NULL) { 2186 g_mirror_sync_start(disk); 2187 g_mirror_update_metadata(disk); 2188 } 2189 break; 2190 case G_MIRROR_DISK_STATE_DISCONNECTED: 2191 /* 2192 * Possible scenarios: 2193 * 1. Device wasn't running yet, but disk disappear. 2194 * 2. Disk was active and disapppear. 2195 * 3. Disk disappear during synchronization process. 2196 */ 2197 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) { 2198 /* 2199 * Previous state should be ACTIVE, STALE or 2200 * SYNCHRONIZING. 2201 */ 2202 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 2203 disk->d_state == G_MIRROR_DISK_STATE_STALE || 2204 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2205 ("Wrong disk state (%s, %s).", 2206 g_mirror_get_diskname(disk), 2207 g_mirror_disk_state2str(disk->d_state))); 2208 } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) { 2209 /* Previous state should be NEW. */ 2210 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2211 ("Wrong disk state (%s, %s).", 2212 g_mirror_get_diskname(disk), 2213 g_mirror_disk_state2str(disk->d_state))); 2214 /* 2215 * Reset bumping syncid if disk disappeared in STARTING 2216 * state. 2217 */ 2218 if (sc->sc_bump_syncid == G_MIRROR_BUMP_ON_FIRST_WRITE) 2219 sc->sc_bump_syncid = 0; 2220#ifdef INVARIANTS 2221 } else { 2222 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).", 2223 sc->sc_name, 2224 g_mirror_device_state2str(sc->sc_state), 2225 g_mirror_get_diskname(disk), 2226 g_mirror_disk_state2str(disk->d_state))); 2227#endif 2228 } 2229 DISK_STATE_CHANGED(); 2230 G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.", 2231 sc->sc_name, g_mirror_get_diskname(disk)); 2232 2233 g_mirror_destroy_disk(disk); 2234 break; 2235 case G_MIRROR_DISK_STATE_DESTROY: 2236 { 2237 int error; 2238 2239 error = g_mirror_clear_metadata(disk); 2240 if (error != 0) 2241 return (error); 2242 DISK_STATE_CHANGED(); 2243 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", 2244 sc->sc_name, g_mirror_get_diskname(disk)); 2245 2246 g_mirror_destroy_disk(disk); 2247 sc->sc_ndisks--; 2248 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2249 g_mirror_update_metadata(disk); 2250 } 2251 break; 2252 } 2253 default: 2254 KASSERT(1 == 0, ("Unknown state (%u).", state)); 2255 break; 2256 } 2257 return (0); 2258} 2259#undef DISK_STATE_CHANGED 2260 2261static int 2262g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md) 2263{ 2264 struct g_provider *pp; 2265 u_char *buf; 2266 int error; 2267 2268 g_topology_assert(); 2269 2270 error = g_access(cp, 1, 0, 0); 2271 if (error != 0) 2272 return (error); 2273 pp = cp->provider; 2274 g_topology_unlock(); 2275 /* Metadata are stored on last sector. */ 2276 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 2277 &error); 2278 g_topology_lock(); 2279 if (buf == NULL) { 2280 g_access(cp, -1, 0, 0); 2281 return (error); 2282 } 2283 if (error != 0) { 2284 g_access(cp, -1, 0, 0); 2285 g_free(buf); 2286 return (error); 2287 } 2288 error = g_access(cp, -1, 0, 0); 2289 KASSERT(error == 0, ("Cannot decrease access count for %s.", pp->name)); 2290 2291 /* Decode metadata. */ 2292 error = mirror_metadata_decode(buf, md); 2293 g_free(buf); 2294 if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0) 2295 return (EINVAL); 2296 if (error != 0) { 2297 G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.", 2298 cp->provider->name); 2299 return (error); 2300 } 2301 2302 return (0); 2303} 2304 2305static int 2306g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp, 2307 struct g_mirror_metadata *md) 2308{ 2309 2310 if (g_mirror_id2disk(sc, md->md_did) != NULL) { 2311 G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.", 2312 pp->name, md->md_did); 2313 return (EEXIST); 2314 } 2315 if (md->md_all != sc->sc_ndisks) { 2316 G_MIRROR_DEBUG(1, 2317 "Invalid '%s' field on disk %s (device %s), skipping.", 2318 "md_all", pp->name, sc->sc_name); 2319 return (EINVAL); 2320 } 2321 if (md->md_slice != sc->sc_slice) { 2322 G_MIRROR_DEBUG(1, 2323 "Invalid '%s' field on disk %s (device %s), skipping.", 2324 "md_slice", pp->name, sc->sc_name); 2325 return (EINVAL); 2326 } 2327 if (md->md_balance != sc->sc_balance) { 2328 G_MIRROR_DEBUG(1, 2329 "Invalid '%s' field on disk %s (device %s), skipping.", 2330 "md_balance", pp->name, sc->sc_name); 2331 return (EINVAL); 2332 } 2333 if (md->md_mediasize != sc->sc_mediasize) { 2334 G_MIRROR_DEBUG(1, 2335 "Invalid '%s' field on disk %s (device %s), skipping.", 2336 "md_mediasize", pp->name, sc->sc_name); 2337 return (EINVAL); 2338 } 2339 if (sc->sc_mediasize > pp->mediasize) { 2340 G_MIRROR_DEBUG(1, 2341 "Invalid size of disk %s (device %s), skipping.", pp->name, 2342 sc->sc_name); 2343 return (EINVAL); 2344 } 2345 if (md->md_sectorsize != sc->sc_sectorsize) { 2346 G_MIRROR_DEBUG(1, 2347 "Invalid '%s' field on disk %s (device %s), skipping.", 2348 "md_sectorsize", pp->name, sc->sc_name); 2349 return (EINVAL); 2350 } 2351 if ((sc->sc_sectorsize % pp->sectorsize) != 0) { 2352 G_MIRROR_DEBUG(1, 2353 "Invalid sector size of disk %s (device %s), skipping.", 2354 pp->name, sc->sc_name); 2355 return (EINVAL); 2356 } 2357 if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) { 2358 G_MIRROR_DEBUG(1, 2359 "Invalid device flags on disk %s (device %s), skipping.", 2360 pp->name, sc->sc_name); 2361 return (EINVAL); 2362 } 2363 if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) { 2364 G_MIRROR_DEBUG(1, 2365 "Invalid disk flags on disk %s (device %s), skipping.", 2366 pp->name, sc->sc_name); 2367 return (EINVAL); 2368 } 2369 return (0); 2370} 2371 2372static int 2373g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp, 2374 struct g_mirror_metadata *md) 2375{ 2376 struct g_mirror_disk *disk; 2377 int error; 2378 2379 g_topology_assert(); 2380 G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name); 2381 2382 error = g_mirror_check_metadata(sc, pp, md); 2383 if (error != 0) 2384 return (error); 2385 disk = g_mirror_init_disk(sc, pp, md, &error); 2386 if (disk == NULL) 2387 return (error); 2388 error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW, 2389 G_MIRROR_EVENT_WAIT); 2390 return (error); 2391} 2392 2393static int 2394g_mirror_access(struct g_provider *pp, int acr, int acw, int ace) 2395{ 2396 struct g_mirror_softc *sc; 2397 struct g_mirror_disk *disk; 2398 int dcr, dcw, dce, err, error; 2399 2400 g_topology_assert(); 2401 G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr, 2402 acw, ace); 2403 2404 dcr = pp->acr + acr; 2405 dcw = pp->acw + acw; 2406 dce = pp->ace + ace; 2407 2408 /* On first open, grab an extra "exclusive" bit */ 2409 if (pp->acr == 0 && pp->acw == 0 && pp->ace == 0) 2410 ace++; 2411 /* ... and let go of it on last close */ 2412 if (dcr == 0 && dcw == 0 && dce == 0) 2413 ace--; 2414 2415 sc = pp->geom->softc; 2416 if (sc == NULL || LIST_EMPTY(&sc->sc_disks)) { 2417 if (acr <= 0 && acw <= 0 && ace <= 0) 2418 return (0); 2419 else 2420 return (ENXIO); 2421 } 2422 error = ENXIO; 2423 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2424 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 2425 continue; 2426 err = g_access(disk->d_consumer, acr, acw, ace); 2427 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", 2428 g_mirror_get_diskname(disk), acr, acw, ace, err); 2429 if (err == 0) { 2430 /* 2431 * Mark disk as dirty on open and unmark on close. 2432 */ 2433 if (pp->acw == 0 && dcw > 0) { 2434 G_MIRROR_DEBUG(1, 2435 "Disk %s (device %s) marked as dirty.", 2436 g_mirror_get_diskname(disk), sc->sc_name); 2437 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 2438 g_mirror_update_metadata(disk); 2439 } else if (pp->acw > 0 && dcw == 0) { 2440 G_MIRROR_DEBUG(1, 2441 "Disk %s (device %s) marked as clean.", 2442 g_mirror_get_diskname(disk), sc->sc_name); 2443 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2444 g_mirror_update_metadata(disk); 2445 } 2446 error = 0; 2447 } else { 2448 sc->sc_bump_syncid = G_MIRROR_BUMP_ON_FIRST_WRITE; 2449 g_mirror_event_send(disk, 2450 G_MIRROR_DISK_STATE_DISCONNECTED, 2451 G_MIRROR_EVENT_DONTWAIT); 2452 } 2453 } 2454 /* 2455 * Be sure to return 0 for negativate access requests. 2456 * In case of some HW problems, it is possible that we don't have 2457 * any active disk here, so loop above will be no-op and error will 2458 * be ENXIO. 2459 */ 2460 if (error != 0 && acr <= 0 && acw <= 0 && ace <= 0) 2461 error = 0; 2462 return (error); 2463} 2464 2465static struct g_geom * 2466g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md) 2467{ 2468 struct g_mirror_softc *sc; 2469 struct g_geom *gp; 2470 int error, timeout; 2471 2472 g_topology_assert(); 2473 G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name, 2474 md->md_mid); 2475 2476 /* One disk is minimum. */ 2477 if (md->md_all < 1) 2478 return (NULL); 2479 /* 2480 * Action geom. 2481 */ 2482 gp = g_new_geomf(mp, "%s", md->md_name); 2483 sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO); 2484 gp->start = g_mirror_start; 2485 gp->spoiled = g_mirror_spoiled; 2486 gp->orphan = g_mirror_orphan; 2487 gp->access = g_mirror_access; 2488 gp->dumpconf = g_mirror_dumpconf; 2489 2490 sc->sc_id = md->md_mid; 2491 sc->sc_slice = md->md_slice; 2492 sc->sc_balance = md->md_balance; 2493 sc->sc_mediasize = md->md_mediasize; 2494 sc->sc_sectorsize = md->md_sectorsize; 2495 sc->sc_ndisks = md->md_all; 2496 sc->sc_flags = md->md_mflags; 2497 sc->sc_bump_syncid = 0; 2498 sc->sc_idle = 0; 2499 bioq_init(&sc->sc_queue); 2500 mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF); 2501 LIST_INIT(&sc->sc_disks); 2502 TAILQ_INIT(&sc->sc_events); 2503 mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF); 2504 callout_init(&sc->sc_callout, CALLOUT_MPSAFE); 2505 sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING; 2506 gp->softc = sc; 2507 sc->sc_geom = gp; 2508 sc->sc_provider = NULL; 2509 /* 2510 * Synchronization geom. 2511 */ 2512 gp = g_new_geomf(mp, "%s.sync", md->md_name); 2513 gp->softc = sc; 2514 gp->orphan = g_mirror_orphan; 2515 sc->sc_sync.ds_geom = gp; 2516 sc->sc_sync.ds_ndisks = 0; 2517 error = kthread_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0, 2518 "g_mirror %s", md->md_name); 2519 if (error != 0) { 2520 G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.", 2521 sc->sc_name); 2522 g_destroy_geom(sc->sc_sync.ds_geom); 2523 mtx_destroy(&sc->sc_events_mtx); 2524 mtx_destroy(&sc->sc_queue_mtx); 2525 g_destroy_geom(sc->sc_geom); 2526 free(sc, M_MIRROR); 2527 return (NULL); 2528 } 2529 2530 G_MIRROR_DEBUG(0, "Device %s created (id=%u).", sc->sc_name, sc->sc_id); 2531 2532 /* 2533 * Run timeout. 2534 */ 2535 timeout = g_mirror_timeout * hz; 2536 callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc); 2537 return (sc->sc_geom); 2538} 2539 2540int 2541g_mirror_destroy(struct g_mirror_softc *sc, boolean_t force) 2542{ 2543 struct g_provider *pp; 2544 2545 g_topology_assert(); 2546 2547 if (sc == NULL) 2548 return (ENXIO); 2549 pp = sc->sc_provider; 2550 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 2551 if (force) { 2552 G_MIRROR_DEBUG(0, "Device %s is still open, so it " 2553 "can't be definitely removed.", pp->name); 2554 } else { 2555 G_MIRROR_DEBUG(1, 2556 "Device %s is still open (r%dw%de%d).", pp->name, 2557 pp->acr, pp->acw, pp->ace); 2558 return (EBUSY); 2559 } 2560 } 2561 2562 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2563 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_WAIT; 2564 g_topology_unlock(); 2565 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 2566 mtx_lock(&sc->sc_queue_mtx); 2567 wakeup(sc); 2568 mtx_unlock(&sc->sc_queue_mtx); 2569 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker); 2570 while (sc->sc_worker != NULL) 2571 tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5); 2572 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker); 2573 g_topology_lock(); 2574 g_mirror_destroy_device(sc); 2575 free(sc, M_MIRROR); 2576 return (0); 2577} 2578 2579static void 2580g_mirror_taste_orphan(struct g_consumer *cp) 2581{ 2582 2583 KASSERT(1 == 0, ("%s called while tasting %s.", __func__, 2584 cp->provider->name)); 2585} 2586 2587static struct g_geom * 2588g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 2589{ 2590 struct g_mirror_metadata md; 2591 struct g_mirror_softc *sc; 2592 struct g_consumer *cp; 2593 struct g_geom *gp; 2594 int error; 2595 2596 g_topology_assert(); 2597 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 2598 G_MIRROR_DEBUG(2, "Tasting %s.", pp->name); 2599 2600 gp = g_new_geomf(mp, "mirror:taste"); 2601 /* 2602 * This orphan function should be never called. 2603 */ 2604 gp->orphan = g_mirror_taste_orphan; 2605 cp = g_new_consumer(gp); 2606 g_attach(cp, pp); 2607 error = g_mirror_read_metadata(cp, &md); 2608 g_detach(cp); 2609 g_destroy_consumer(cp); 2610 g_destroy_geom(gp); 2611 if (error != 0) 2612 return (NULL); 2613 gp = NULL; 2614 2615 if (md.md_version > G_MIRROR_VERSION) { 2616 printf("geom_mirror.ko module is too old to handle %s.\n", 2617 pp->name); 2618 return (NULL); 2619 } 2620 if (md.md_provider[0] != '\0' && strcmp(md.md_provider, pp->name) != 0) 2621 return (NULL); 2622 if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) { 2623 G_MIRROR_DEBUG(0, 2624 "Device %s: provider %s marked as inactive, skipping.", 2625 md.md_name, pp->name); 2626 return (NULL); 2627 } 2628 if (g_mirror_debug >= 2) 2629 mirror_metadata_dump(&md); 2630 2631 /* 2632 * Let's check if device already exists. 2633 */ 2634 sc = NULL; 2635 LIST_FOREACH(gp, &mp->geom, geom) { 2636 sc = gp->softc; 2637 if (sc == NULL) 2638 continue; 2639 if (sc->sc_sync.ds_geom == gp) 2640 continue; 2641 if (strcmp(md.md_name, sc->sc_name) != 0) 2642 continue; 2643 if (md.md_mid != sc->sc_id) { 2644 G_MIRROR_DEBUG(0, "Device %s already configured.", 2645 sc->sc_name); 2646 return (NULL); 2647 } 2648 break; 2649 } 2650 if (gp == NULL) { 2651 gp = g_mirror_create(mp, &md); 2652 if (gp == NULL) { 2653 G_MIRROR_DEBUG(0, "Cannot create device %s.", 2654 md.md_name); 2655 return (NULL); 2656 } 2657 sc = gp->softc; 2658 } 2659 G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name); 2660 error = g_mirror_add_disk(sc, pp, &md); 2661 if (error != 0) { 2662 G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).", 2663 pp->name, gp->name, error); 2664 if (LIST_EMPTY(&sc->sc_disks)) 2665 g_mirror_destroy(sc, 1); 2666 return (NULL); 2667 } 2668 return (gp); 2669} 2670 2671static int 2672g_mirror_destroy_geom(struct gctl_req *req __unused, 2673 struct g_class *mp __unused, struct g_geom *gp) 2674{ 2675 2676 return (g_mirror_destroy(gp->softc, 0)); 2677} 2678 2679static void 2680g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 2681 struct g_consumer *cp, struct g_provider *pp) 2682{ 2683 struct g_mirror_softc *sc; 2684 2685 g_topology_assert(); 2686 2687 sc = gp->softc; 2688 if (sc == NULL) 2689 return; 2690 /* Skip synchronization geom. */ 2691 if (gp == sc->sc_sync.ds_geom) 2692 return; 2693 if (pp != NULL) { 2694 /* Nothing here. */ 2695 } else if (cp != NULL) { 2696 struct g_mirror_disk *disk; 2697 2698 disk = cp->private; 2699 if (disk == NULL) 2700 return; 2701 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id); 2702 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2703 sbuf_printf(sb, "%s<Synchronized>", indent); 2704 if (disk->d_sync.ds_offset_done == 0) 2705 sbuf_printf(sb, "0%%"); 2706 else { 2707 sbuf_printf(sb, "%u%%", 2708 (u_int)((disk->d_sync.ds_offset_done * 100) / 2709 sc->sc_provider->mediasize)); 2710 } 2711 sbuf_printf(sb, "</Synchronized>\n"); 2712 } 2713 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, 2714 disk->d_sync.ds_syncid); 2715 sbuf_printf(sb, "%s<Flags>", indent); 2716 if (disk->d_flags == 0) 2717 sbuf_printf(sb, "NONE"); 2718 else { 2719 int first = 1; 2720 2721#define ADD_FLAG(flag, name) do { \ 2722 if ((disk->d_flags & (flag)) != 0) { \ 2723 if (!first) \ 2724 sbuf_printf(sb, ", "); \ 2725 else \ 2726 first = 0; \ 2727 sbuf_printf(sb, name); \ 2728 } \ 2729} while (0) 2730 ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY"); 2731 ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED"); 2732 ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE"); 2733 ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING, 2734 "SYNCHRONIZING"); 2735 ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC"); 2736#undef ADD_FLAG 2737 } 2738 sbuf_printf(sb, "</Flags>\n"); 2739 sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent, 2740 disk->d_priority); 2741 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 2742 g_mirror_disk_state2str(disk->d_state)); 2743 } else { 2744 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id); 2745 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid); 2746 sbuf_printf(sb, "%s<Flags>", indent); 2747 if (sc->sc_flags == 0) 2748 sbuf_printf(sb, "NONE"); 2749 else { 2750 int first = 1; 2751 2752#define ADD_FLAG(flag, name) do { \ 2753 if ((sc->sc_flags & (flag)) != 0) { \ 2754 if (!first) \ 2755 sbuf_printf(sb, ", "); \ 2756 else \ 2757 first = 0; \ 2758 sbuf_printf(sb, name); \ 2759 } \ 2760} while (0) 2761 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC"); 2762#undef ADD_FLAG 2763 } 2764 sbuf_printf(sb, "</Flags>\n"); 2765 sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent, 2766 (u_int)sc->sc_slice); 2767 sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent, 2768 balance_name(sc->sc_balance)); 2769 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent, 2770 sc->sc_ndisks); 2771 sbuf_printf(sb, "%s<State>", indent); 2772 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 2773 sbuf_printf(sb, "%s", "STARTING"); 2774 else if (sc->sc_ndisks == 2775 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE)) 2776 sbuf_printf(sb, "%s", "COMPLETE"); 2777 else 2778 sbuf_printf(sb, "%s", "DEGRADED"); 2779 sbuf_printf(sb, "</State>\n"); 2780 } 2781} 2782 2783static void 2784g_mirror_shutdown(void *arg, int howto) 2785{ 2786 struct g_class *mp; 2787 struct g_geom *gp, *gp2; 2788 2789 mp = arg; 2790 g_topology_lock(); 2791 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 2792 if (gp->softc == NULL) 2793 continue; 2794 g_mirror_destroy(gp->softc, 1); 2795 } 2796 g_topology_unlock(); 2797#if 0 2798 tsleep(&gp, PRIBIO, "m:shutdown", hz * 20); 2799#endif 2800} 2801 2802static void 2803g_mirror_init(struct g_class *mp) 2804{ 2805 2806 g_mirror_ehtag = EVENTHANDLER_REGISTER(shutdown_post_sync, 2807 g_mirror_shutdown, mp, SHUTDOWN_PRI_FIRST); 2808 if (g_mirror_ehtag == NULL) 2809 G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event."); 2810} 2811 2812static void 2813g_mirror_fini(struct g_class *mp) 2814{ 2815 2816 if (g_mirror_ehtag == NULL) 2817 return; 2818 EVENTHANDLER_DEREGISTER(shutdown_post_sync, g_mirror_ehtag); 2819} 2820 2821static int 2822g_mirror_can_go(void) 2823{ 2824 struct g_mirror_softc *sc; 2825 struct g_geom *gp; 2826 struct g_provider *pp; 2827 int can_go; 2828 2829 DROP_GIANT(); 2830 can_go = 1; 2831 g_topology_lock(); 2832 LIST_FOREACH(gp, &g_mirror_class.geom, geom) { 2833 sc = gp->softc; 2834 if (sc == NULL) { 2835 can_go = 0; 2836 break; 2837 } 2838 pp = sc->sc_provider; 2839 if (pp == NULL || pp->error != 0) { 2840 can_go = 0; 2841 break; 2842 } 2843 } 2844 g_topology_unlock(); 2845 PICKUP_GIANT(); 2846 return (can_go); 2847} 2848 2849static void 2850g_mirror_rootwait(void) 2851{ 2852 2853 /* 2854 * HACK: Wait for GEOM, because g_mirror_rootwait() can be called, 2855 * HACK: before we get providers for tasting. 2856 */ 2857 tsleep(&g_mirror_class, PRIBIO, "mroot", hz * 3); 2858 /* 2859 * Wait for mirrors in degraded state. 2860 */ 2861 for (;;) { 2862 if (g_mirror_can_go()) 2863 break; 2864 tsleep(&g_mirror_class, PRIBIO, "mroot", hz); 2865 } 2866} 2867 2868SYSINIT(g_mirror_root, SI_SUB_RAID, SI_ORDER_FIRST, g_mirror_rootwait, NULL) 2869 2870DECLARE_GEOM_CLASS(g_mirror_class, g_mirror); 2871