g_mirror.c revision 260385
1/*- 2 * Copyright (c) 2004-2006 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: stable/10/sys/geom/mirror/g_mirror.c 260385 2014-01-07 01:32:23Z scottl $"); 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/sbuf.h> 39#include <sys/sysctl.h> 40#include <sys/malloc.h> 41#include <sys/eventhandler.h> 42#include <vm/uma.h> 43#include <geom/geom.h> 44#include <sys/proc.h> 45#include <sys/kthread.h> 46#include <sys/sched.h> 47#include <geom/mirror/g_mirror.h> 48 49FEATURE(geom_mirror, "GEOM mirroring support"); 50 51static MALLOC_DEFINE(M_MIRROR, "mirror_data", "GEOM_MIRROR Data"); 52 53SYSCTL_DECL(_kern_geom); 54static SYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW, 0, 55 "GEOM_MIRROR stuff"); 56u_int g_mirror_debug = 0; 57TUNABLE_INT("kern.geom.mirror.debug", &g_mirror_debug); 58SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RW, &g_mirror_debug, 0, 59 "Debug level"); 60static u_int g_mirror_timeout = 4; 61TUNABLE_INT("kern.geom.mirror.timeout", &g_mirror_timeout); 62SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RW, &g_mirror_timeout, 63 0, "Time to wait on all mirror components"); 64static u_int g_mirror_idletime = 5; 65TUNABLE_INT("kern.geom.mirror.idletime", &g_mirror_idletime); 66SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, idletime, CTLFLAG_RW, 67 &g_mirror_idletime, 0, "Mark components as clean when idling"); 68static u_int g_mirror_disconnect_on_failure = 1; 69TUNABLE_INT("kern.geom.mirror.disconnect_on_failure", 70 &g_mirror_disconnect_on_failure); 71SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, disconnect_on_failure, CTLFLAG_RW, 72 &g_mirror_disconnect_on_failure, 0, "Disconnect component on I/O failure."); 73static u_int g_mirror_syncreqs = 2; 74TUNABLE_INT("kern.geom.mirror.sync_requests", &g_mirror_syncreqs); 75SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_requests, CTLFLAG_RDTUN, 76 &g_mirror_syncreqs, 0, "Parallel synchronization I/O requests."); 77 78#define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \ 79 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \ 80 msleep((ident), (mtx), (priority), (wmesg), (timeout)); \ 81 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \ 82} while (0) 83 84static eventhandler_tag g_mirror_post_sync = NULL; 85static int g_mirror_shutdown = 0; 86 87static int g_mirror_destroy_geom(struct gctl_req *req, struct g_class *mp, 88 struct g_geom *gp); 89static g_taste_t g_mirror_taste; 90static void g_mirror_init(struct g_class *mp); 91static void g_mirror_fini(struct g_class *mp); 92 93struct g_class g_mirror_class = { 94 .name = G_MIRROR_CLASS_NAME, 95 .version = G_VERSION, 96 .ctlreq = g_mirror_config, 97 .taste = g_mirror_taste, 98 .destroy_geom = g_mirror_destroy_geom, 99 .init = g_mirror_init, 100 .fini = g_mirror_fini 101}; 102 103 104static void g_mirror_destroy_provider(struct g_mirror_softc *sc); 105static int g_mirror_update_disk(struct g_mirror_disk *disk, u_int state); 106static void g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force); 107static void g_mirror_dumpconf(struct sbuf *sb, const char *indent, 108 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp); 109static void g_mirror_sync_stop(struct g_mirror_disk *disk, int type); 110static void g_mirror_register_request(struct bio *bp); 111static void g_mirror_sync_release(struct g_mirror_softc *sc); 112 113 114static const char * 115g_mirror_disk_state2str(int state) 116{ 117 118 switch (state) { 119 case G_MIRROR_DISK_STATE_NONE: 120 return ("NONE"); 121 case G_MIRROR_DISK_STATE_NEW: 122 return ("NEW"); 123 case G_MIRROR_DISK_STATE_ACTIVE: 124 return ("ACTIVE"); 125 case G_MIRROR_DISK_STATE_STALE: 126 return ("STALE"); 127 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 128 return ("SYNCHRONIZING"); 129 case G_MIRROR_DISK_STATE_DISCONNECTED: 130 return ("DISCONNECTED"); 131 case G_MIRROR_DISK_STATE_DESTROY: 132 return ("DESTROY"); 133 default: 134 return ("INVALID"); 135 } 136} 137 138static const char * 139g_mirror_device_state2str(int state) 140{ 141 142 switch (state) { 143 case G_MIRROR_DEVICE_STATE_STARTING: 144 return ("STARTING"); 145 case G_MIRROR_DEVICE_STATE_RUNNING: 146 return ("RUNNING"); 147 default: 148 return ("INVALID"); 149 } 150} 151 152static const char * 153g_mirror_get_diskname(struct g_mirror_disk *disk) 154{ 155 156 if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL) 157 return ("[unknown]"); 158 return (disk->d_name); 159} 160 161/* 162 * --- Events handling functions --- 163 * Events in geom_mirror are used to maintain disks and device status 164 * from one thread to simplify locking. 165 */ 166static void 167g_mirror_event_free(struct g_mirror_event *ep) 168{ 169 170 free(ep, M_MIRROR); 171} 172 173int 174g_mirror_event_send(void *arg, int state, int flags) 175{ 176 struct g_mirror_softc *sc; 177 struct g_mirror_disk *disk; 178 struct g_mirror_event *ep; 179 int error; 180 181 ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK); 182 G_MIRROR_DEBUG(4, "%s: Sending event %p.", __func__, ep); 183 if ((flags & G_MIRROR_EVENT_DEVICE) != 0) { 184 disk = NULL; 185 sc = arg; 186 } else { 187 disk = arg; 188 sc = disk->d_softc; 189 } 190 ep->e_disk = disk; 191 ep->e_state = state; 192 ep->e_flags = flags; 193 ep->e_error = 0; 194 mtx_lock(&sc->sc_events_mtx); 195 TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next); 196 mtx_unlock(&sc->sc_events_mtx); 197 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 198 mtx_lock(&sc->sc_queue_mtx); 199 wakeup(sc); 200 mtx_unlock(&sc->sc_queue_mtx); 201 if ((flags & G_MIRROR_EVENT_DONTWAIT) != 0) 202 return (0); 203 sx_assert(&sc->sc_lock, SX_XLOCKED); 204 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep); 205 sx_xunlock(&sc->sc_lock); 206 while ((ep->e_flags & G_MIRROR_EVENT_DONE) == 0) { 207 mtx_lock(&sc->sc_events_mtx); 208 MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "m:event", 209 hz * 5); 210 } 211 error = ep->e_error; 212 g_mirror_event_free(ep); 213 sx_xlock(&sc->sc_lock); 214 return (error); 215} 216 217static struct g_mirror_event * 218g_mirror_event_get(struct g_mirror_softc *sc) 219{ 220 struct g_mirror_event *ep; 221 222 mtx_lock(&sc->sc_events_mtx); 223 ep = TAILQ_FIRST(&sc->sc_events); 224 mtx_unlock(&sc->sc_events_mtx); 225 return (ep); 226} 227 228static void 229g_mirror_event_remove(struct g_mirror_softc *sc, struct g_mirror_event *ep) 230{ 231 232 mtx_lock(&sc->sc_events_mtx); 233 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 234 mtx_unlock(&sc->sc_events_mtx); 235} 236 237static void 238g_mirror_event_cancel(struct g_mirror_disk *disk) 239{ 240 struct g_mirror_softc *sc; 241 struct g_mirror_event *ep, *tmpep; 242 243 sc = disk->d_softc; 244 sx_assert(&sc->sc_lock, SX_XLOCKED); 245 246 mtx_lock(&sc->sc_events_mtx); 247 TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) { 248 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) 249 continue; 250 if (ep->e_disk != disk) 251 continue; 252 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 253 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 254 g_mirror_event_free(ep); 255 else { 256 ep->e_error = ECANCELED; 257 wakeup(ep); 258 } 259 } 260 mtx_unlock(&sc->sc_events_mtx); 261} 262 263/* 264 * Return the number of disks in given state. 265 * If state is equal to -1, count all connected disks. 266 */ 267u_int 268g_mirror_ndisks(struct g_mirror_softc *sc, int state) 269{ 270 struct g_mirror_disk *disk; 271 u_int n = 0; 272 273 sx_assert(&sc->sc_lock, SX_LOCKED); 274 275 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 276 if (state == -1 || disk->d_state == state) 277 n++; 278 } 279 return (n); 280} 281 282/* 283 * Find a disk in mirror by its disk ID. 284 */ 285static struct g_mirror_disk * 286g_mirror_id2disk(struct g_mirror_softc *sc, uint32_t id) 287{ 288 struct g_mirror_disk *disk; 289 290 sx_assert(&sc->sc_lock, SX_XLOCKED); 291 292 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 293 if (disk->d_id == id) 294 return (disk); 295 } 296 return (NULL); 297} 298 299static u_int 300g_mirror_nrequests(struct g_mirror_softc *sc, struct g_consumer *cp) 301{ 302 struct bio *bp; 303 u_int nreqs = 0; 304 305 mtx_lock(&sc->sc_queue_mtx); 306 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) { 307 if (bp->bio_from == cp) 308 nreqs++; 309 } 310 mtx_unlock(&sc->sc_queue_mtx); 311 return (nreqs); 312} 313 314static int 315g_mirror_is_busy(struct g_mirror_softc *sc, struct g_consumer *cp) 316{ 317 318 if (cp->index > 0) { 319 G_MIRROR_DEBUG(2, 320 "I/O requests for %s exist, can't destroy it now.", 321 cp->provider->name); 322 return (1); 323 } 324 if (g_mirror_nrequests(sc, cp) > 0) { 325 G_MIRROR_DEBUG(2, 326 "I/O requests for %s in queue, can't destroy it now.", 327 cp->provider->name); 328 return (1); 329 } 330 return (0); 331} 332 333static void 334g_mirror_destroy_consumer(void *arg, int flags __unused) 335{ 336 struct g_consumer *cp; 337 338 g_topology_assert(); 339 340 cp = arg; 341 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", cp->provider->name); 342 g_detach(cp); 343 g_destroy_consumer(cp); 344} 345 346static void 347g_mirror_kill_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 348{ 349 struct g_provider *pp; 350 int retaste_wait; 351 352 g_topology_assert(); 353 354 cp->private = NULL; 355 if (g_mirror_is_busy(sc, cp)) 356 return; 357 pp = cp->provider; 358 retaste_wait = 0; 359 if (cp->acw == 1) { 360 if ((pp->geom->flags & G_GEOM_WITHER) == 0) 361 retaste_wait = 1; 362 } 363 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", pp->name, -cp->acr, 364 -cp->acw, -cp->ace, 0); 365 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 366 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 367 if (retaste_wait) { 368 /* 369 * After retaste event was send (inside g_access()), we can send 370 * event to detach and destroy consumer. 371 * A class, which has consumer to the given provider connected 372 * will not receive retaste event for the provider. 373 * This is the way how I ignore retaste events when I close 374 * consumers opened for write: I detach and destroy consumer 375 * after retaste event is sent. 376 */ 377 g_post_event(g_mirror_destroy_consumer, cp, M_WAITOK, NULL); 378 return; 379 } 380 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", pp->name); 381 g_detach(cp); 382 g_destroy_consumer(cp); 383} 384 385static int 386g_mirror_connect_disk(struct g_mirror_disk *disk, struct g_provider *pp) 387{ 388 struct g_consumer *cp; 389 int error; 390 391 g_topology_assert_not(); 392 KASSERT(disk->d_consumer == NULL, 393 ("Disk already connected (device %s).", disk->d_softc->sc_name)); 394 395 g_topology_lock(); 396 cp = g_new_consumer(disk->d_softc->sc_geom); 397 cp->flags |= G_CF_DIRECT_RECEIVE; 398 error = g_attach(cp, pp); 399 if (error != 0) { 400 g_destroy_consumer(cp); 401 g_topology_unlock(); 402 return (error); 403 } 404 error = g_access(cp, 1, 1, 1); 405 if (error != 0) { 406 g_detach(cp); 407 g_destroy_consumer(cp); 408 g_topology_unlock(); 409 G_MIRROR_DEBUG(0, "Cannot open consumer %s (error=%d).", 410 pp->name, error); 411 return (error); 412 } 413 g_topology_unlock(); 414 disk->d_consumer = cp; 415 disk->d_consumer->private = disk; 416 disk->d_consumer->index = 0; 417 418 G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk)); 419 return (0); 420} 421 422static void 423g_mirror_disconnect_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 424{ 425 426 g_topology_assert(); 427 428 if (cp == NULL) 429 return; 430 if (cp->provider != NULL) 431 g_mirror_kill_consumer(sc, cp); 432 else 433 g_destroy_consumer(cp); 434} 435 436/* 437 * Initialize disk. This means allocate memory, create consumer, attach it 438 * to the provider and open access (r1w1e1) to it. 439 */ 440static struct g_mirror_disk * 441g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp, 442 struct g_mirror_metadata *md, int *errorp) 443{ 444 struct g_mirror_disk *disk; 445 int i, error; 446 447 disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO); 448 if (disk == NULL) { 449 error = ENOMEM; 450 goto fail; 451 } 452 disk->d_softc = sc; 453 error = g_mirror_connect_disk(disk, pp); 454 if (error != 0) 455 goto fail; 456 disk->d_id = md->md_did; 457 disk->d_state = G_MIRROR_DISK_STATE_NONE; 458 disk->d_priority = md->md_priority; 459 disk->d_flags = md->md_dflags; 460 error = g_getattr("GEOM::candelete", disk->d_consumer, &i); 461 if (error == 0 && i != 0) 462 disk->d_flags |= G_MIRROR_DISK_FLAG_CANDELETE; 463 if (md->md_provider[0] != '\0') 464 disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED; 465 disk->d_sync.ds_consumer = NULL; 466 disk->d_sync.ds_offset = md->md_sync_offset; 467 disk->d_sync.ds_offset_done = md->md_sync_offset; 468 disk->d_genid = md->md_genid; 469 disk->d_sync.ds_syncid = md->md_syncid; 470 if (errorp != NULL) 471 *errorp = 0; 472 return (disk); 473fail: 474 if (errorp != NULL) 475 *errorp = error; 476 if (disk != NULL) 477 free(disk, M_MIRROR); 478 return (NULL); 479} 480 481static void 482g_mirror_destroy_disk(struct g_mirror_disk *disk) 483{ 484 struct g_mirror_softc *sc; 485 486 g_topology_assert_not(); 487 sc = disk->d_softc; 488 sx_assert(&sc->sc_lock, SX_XLOCKED); 489 490 LIST_REMOVE(disk, d_next); 491 g_mirror_event_cancel(disk); 492 if (sc->sc_hint == disk) 493 sc->sc_hint = NULL; 494 switch (disk->d_state) { 495 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 496 g_mirror_sync_stop(disk, 1); 497 /* FALLTHROUGH */ 498 case G_MIRROR_DISK_STATE_NEW: 499 case G_MIRROR_DISK_STATE_STALE: 500 case G_MIRROR_DISK_STATE_ACTIVE: 501 g_topology_lock(); 502 g_mirror_disconnect_consumer(sc, disk->d_consumer); 503 g_topology_unlock(); 504 free(disk, M_MIRROR); 505 break; 506 default: 507 KASSERT(0 == 1, ("Wrong disk state (%s, %s).", 508 g_mirror_get_diskname(disk), 509 g_mirror_disk_state2str(disk->d_state))); 510 } 511} 512 513static void 514g_mirror_destroy_device(struct g_mirror_softc *sc) 515{ 516 struct g_mirror_disk *disk; 517 struct g_mirror_event *ep; 518 struct g_geom *gp; 519 struct g_consumer *cp, *tmpcp; 520 521 g_topology_assert_not(); 522 sx_assert(&sc->sc_lock, SX_XLOCKED); 523 524 gp = sc->sc_geom; 525 if (sc->sc_provider != NULL) 526 g_mirror_destroy_provider(sc); 527 for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL; 528 disk = LIST_FIRST(&sc->sc_disks)) { 529 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 530 g_mirror_update_metadata(disk); 531 g_mirror_destroy_disk(disk); 532 } 533 while ((ep = g_mirror_event_get(sc)) != NULL) { 534 g_mirror_event_remove(sc, ep); 535 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 536 g_mirror_event_free(ep); 537 else { 538 ep->e_error = ECANCELED; 539 ep->e_flags |= G_MIRROR_EVENT_DONE; 540 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep); 541 mtx_lock(&sc->sc_events_mtx); 542 wakeup(ep); 543 mtx_unlock(&sc->sc_events_mtx); 544 } 545 } 546 callout_drain(&sc->sc_callout); 547 548 g_topology_lock(); 549 LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) { 550 g_mirror_disconnect_consumer(sc, cp); 551 } 552 g_wither_geom(sc->sc_sync.ds_geom, ENXIO); 553 G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name); 554 g_wither_geom(gp, ENXIO); 555 g_topology_unlock(); 556 mtx_destroy(&sc->sc_queue_mtx); 557 mtx_destroy(&sc->sc_events_mtx); 558 mtx_destroy(&sc->sc_done_mtx); 559 sx_xunlock(&sc->sc_lock); 560 sx_destroy(&sc->sc_lock); 561} 562 563static void 564g_mirror_orphan(struct g_consumer *cp) 565{ 566 struct g_mirror_disk *disk; 567 568 g_topology_assert(); 569 570 disk = cp->private; 571 if (disk == NULL) 572 return; 573 disk->d_softc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 574 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 575 G_MIRROR_EVENT_DONTWAIT); 576} 577 578/* 579 * Function should return the next active disk on the list. 580 * It is possible that it will be the same disk as given. 581 * If there are no active disks on list, NULL is returned. 582 */ 583static __inline struct g_mirror_disk * 584g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 585{ 586 struct g_mirror_disk *dp; 587 588 for (dp = LIST_NEXT(disk, d_next); dp != disk; 589 dp = LIST_NEXT(dp, d_next)) { 590 if (dp == NULL) 591 dp = LIST_FIRST(&sc->sc_disks); 592 if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE) 593 break; 594 } 595 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 596 return (NULL); 597 return (dp); 598} 599 600static struct g_mirror_disk * 601g_mirror_get_disk(struct g_mirror_softc *sc) 602{ 603 struct g_mirror_disk *disk; 604 605 if (sc->sc_hint == NULL) { 606 sc->sc_hint = LIST_FIRST(&sc->sc_disks); 607 if (sc->sc_hint == NULL) 608 return (NULL); 609 } 610 disk = sc->sc_hint; 611 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) { 612 disk = g_mirror_find_next(sc, disk); 613 if (disk == NULL) 614 return (NULL); 615 } 616 sc->sc_hint = g_mirror_find_next(sc, disk); 617 return (disk); 618} 619 620static int 621g_mirror_write_metadata(struct g_mirror_disk *disk, 622 struct g_mirror_metadata *md) 623{ 624 struct g_mirror_softc *sc; 625 struct g_consumer *cp; 626 off_t offset, length; 627 u_char *sector; 628 int error = 0; 629 630 g_topology_assert_not(); 631 sc = disk->d_softc; 632 sx_assert(&sc->sc_lock, SX_LOCKED); 633 634 cp = disk->d_consumer; 635 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name)); 636 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name)); 637 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 638 ("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr, 639 cp->acw, cp->ace)); 640 length = cp->provider->sectorsize; 641 offset = cp->provider->mediasize - length; 642 sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO); 643 if (md != NULL) 644 mirror_metadata_encode(md, sector); 645 error = g_write_data(cp, offset, sector, length); 646 free(sector, M_MIRROR); 647 if (error != 0) { 648 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 649 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 650 G_MIRROR_DEBUG(0, "Cannot write metadata on %s " 651 "(device=%s, error=%d).", 652 g_mirror_get_diskname(disk), sc->sc_name, error); 653 } else { 654 G_MIRROR_DEBUG(1, "Cannot write metadata on %s " 655 "(device=%s, error=%d).", 656 g_mirror_get_diskname(disk), sc->sc_name, error); 657 } 658 if (g_mirror_disconnect_on_failure && 659 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) { 660 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 661 g_mirror_event_send(disk, 662 G_MIRROR_DISK_STATE_DISCONNECTED, 663 G_MIRROR_EVENT_DONTWAIT); 664 } 665 } 666 return (error); 667} 668 669static int 670g_mirror_clear_metadata(struct g_mirror_disk *disk) 671{ 672 int error; 673 674 g_topology_assert_not(); 675 sx_assert(&disk->d_softc->sc_lock, SX_LOCKED); 676 677 error = g_mirror_write_metadata(disk, NULL); 678 if (error == 0) { 679 G_MIRROR_DEBUG(2, "Metadata on %s cleared.", 680 g_mirror_get_diskname(disk)); 681 } else { 682 G_MIRROR_DEBUG(0, 683 "Cannot clear metadata on disk %s (error=%d).", 684 g_mirror_get_diskname(disk), error); 685 } 686 return (error); 687} 688 689void 690g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk, 691 struct g_mirror_metadata *md) 692{ 693 694 strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic)); 695 md->md_version = G_MIRROR_VERSION; 696 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name)); 697 md->md_mid = sc->sc_id; 698 md->md_all = sc->sc_ndisks; 699 md->md_slice = sc->sc_slice; 700 md->md_balance = sc->sc_balance; 701 md->md_genid = sc->sc_genid; 702 md->md_mediasize = sc->sc_mediasize; 703 md->md_sectorsize = sc->sc_sectorsize; 704 md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK); 705 bzero(md->md_provider, sizeof(md->md_provider)); 706 if (disk == NULL) { 707 md->md_did = arc4random(); 708 md->md_priority = 0; 709 md->md_syncid = 0; 710 md->md_dflags = 0; 711 md->md_sync_offset = 0; 712 md->md_provsize = 0; 713 } else { 714 md->md_did = disk->d_id; 715 md->md_priority = disk->d_priority; 716 md->md_syncid = disk->d_sync.ds_syncid; 717 md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK); 718 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 719 md->md_sync_offset = disk->d_sync.ds_offset_done; 720 else 721 md->md_sync_offset = 0; 722 if ((disk->d_flags & G_MIRROR_DISK_FLAG_HARDCODED) != 0) { 723 strlcpy(md->md_provider, 724 disk->d_consumer->provider->name, 725 sizeof(md->md_provider)); 726 } 727 md->md_provsize = disk->d_consumer->provider->mediasize; 728 } 729} 730 731void 732g_mirror_update_metadata(struct g_mirror_disk *disk) 733{ 734 struct g_mirror_softc *sc; 735 struct g_mirror_metadata md; 736 int error; 737 738 g_topology_assert_not(); 739 sc = disk->d_softc; 740 sx_assert(&sc->sc_lock, SX_LOCKED); 741 742 g_mirror_fill_metadata(sc, disk, &md); 743 error = g_mirror_write_metadata(disk, &md); 744 if (error == 0) { 745 G_MIRROR_DEBUG(2, "Metadata on %s updated.", 746 g_mirror_get_diskname(disk)); 747 } else { 748 G_MIRROR_DEBUG(0, 749 "Cannot update metadata on disk %s (error=%d).", 750 g_mirror_get_diskname(disk), error); 751 } 752} 753 754static void 755g_mirror_bump_syncid(struct g_mirror_softc *sc) 756{ 757 struct g_mirror_disk *disk; 758 759 g_topology_assert_not(); 760 sx_assert(&sc->sc_lock, SX_XLOCKED); 761 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 762 ("%s called with no active disks (device=%s).", __func__, 763 sc->sc_name)); 764 765 sc->sc_syncid++; 766 G_MIRROR_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name, 767 sc->sc_syncid); 768 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 769 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 770 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 771 disk->d_sync.ds_syncid = sc->sc_syncid; 772 g_mirror_update_metadata(disk); 773 } 774 } 775} 776 777static void 778g_mirror_bump_genid(struct g_mirror_softc *sc) 779{ 780 struct g_mirror_disk *disk; 781 782 g_topology_assert_not(); 783 sx_assert(&sc->sc_lock, SX_XLOCKED); 784 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 785 ("%s called with no active disks (device=%s).", __func__, 786 sc->sc_name)); 787 788 sc->sc_genid++; 789 G_MIRROR_DEBUG(1, "Device %s: genid bumped to %u.", sc->sc_name, 790 sc->sc_genid); 791 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 792 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 793 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 794 disk->d_genid = sc->sc_genid; 795 g_mirror_update_metadata(disk); 796 } 797 } 798} 799 800static int 801g_mirror_idle(struct g_mirror_softc *sc, int acw) 802{ 803 struct g_mirror_disk *disk; 804 int timeout; 805 806 g_topology_assert_not(); 807 sx_assert(&sc->sc_lock, SX_XLOCKED); 808 809 if (sc->sc_provider == NULL) 810 return (0); 811 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 812 return (0); 813 if (sc->sc_idle) 814 return (0); 815 if (sc->sc_writes > 0) 816 return (0); 817 if (acw > 0 || (acw == -1 && sc->sc_provider->acw > 0)) { 818 timeout = g_mirror_idletime - (time_uptime - sc->sc_last_write); 819 if (!g_mirror_shutdown && timeout > 0) 820 return (timeout); 821 } 822 sc->sc_idle = 1; 823 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 824 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 825 continue; 826 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.", 827 g_mirror_get_diskname(disk), sc->sc_name); 828 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 829 g_mirror_update_metadata(disk); 830 } 831 return (0); 832} 833 834static void 835g_mirror_unidle(struct g_mirror_softc *sc) 836{ 837 struct g_mirror_disk *disk; 838 839 g_topology_assert_not(); 840 sx_assert(&sc->sc_lock, SX_XLOCKED); 841 842 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 843 return; 844 sc->sc_idle = 0; 845 sc->sc_last_write = time_uptime; 846 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 847 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 848 continue; 849 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.", 850 g_mirror_get_diskname(disk), sc->sc_name); 851 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 852 g_mirror_update_metadata(disk); 853 } 854} 855 856static void 857g_mirror_flush_done(struct bio *bp) 858{ 859 struct g_mirror_softc *sc; 860 struct bio *pbp; 861 862 pbp = bp->bio_parent; 863 sc = pbp->bio_to->geom->softc; 864 mtx_lock(&sc->sc_done_mtx); 865 if (pbp->bio_error == 0) 866 pbp->bio_error = bp->bio_error; 867 pbp->bio_completed += bp->bio_completed; 868 pbp->bio_inbed++; 869 if (pbp->bio_children == pbp->bio_inbed) { 870 mtx_unlock(&sc->sc_done_mtx); 871 g_io_deliver(pbp, pbp->bio_error); 872 } else 873 mtx_unlock(&sc->sc_done_mtx); 874 g_destroy_bio(bp); 875} 876 877static void 878g_mirror_done(struct bio *bp) 879{ 880 struct g_mirror_softc *sc; 881 882 sc = bp->bio_from->geom->softc; 883 bp->bio_cflags = G_MIRROR_BIO_FLAG_REGULAR; 884 mtx_lock(&sc->sc_queue_mtx); 885 bioq_disksort(&sc->sc_queue, bp); 886 mtx_unlock(&sc->sc_queue_mtx); 887 wakeup(sc); 888} 889 890static void 891g_mirror_regular_request(struct bio *bp) 892{ 893 struct g_mirror_softc *sc; 894 struct g_mirror_disk *disk; 895 struct bio *pbp; 896 897 g_topology_assert_not(); 898 899 pbp = bp->bio_parent; 900 sc = pbp->bio_to->geom->softc; 901 bp->bio_from->index--; 902 if (bp->bio_cmd == BIO_WRITE) 903 sc->sc_writes--; 904 disk = bp->bio_from->private; 905 if (disk == NULL) { 906 g_topology_lock(); 907 g_mirror_kill_consumer(sc, bp->bio_from); 908 g_topology_unlock(); 909 } 910 911 pbp->bio_inbed++; 912 KASSERT(pbp->bio_inbed <= pbp->bio_children, 913 ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed, 914 pbp->bio_children)); 915 if (bp->bio_error == 0 && pbp->bio_error == 0) { 916 G_MIRROR_LOGREQ(3, bp, "Request delivered."); 917 g_destroy_bio(bp); 918 if (pbp->bio_children == pbp->bio_inbed) { 919 G_MIRROR_LOGREQ(3, pbp, "Request delivered."); 920 pbp->bio_completed = pbp->bio_length; 921 if (pbp->bio_cmd == BIO_WRITE || 922 pbp->bio_cmd == BIO_DELETE) { 923 bioq_remove(&sc->sc_inflight, pbp); 924 /* Release delayed sync requests if possible. */ 925 g_mirror_sync_release(sc); 926 } 927 g_io_deliver(pbp, pbp->bio_error); 928 } 929 return; 930 } else if (bp->bio_error != 0) { 931 if (pbp->bio_error == 0) 932 pbp->bio_error = bp->bio_error; 933 if (disk != NULL) { 934 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 935 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 936 G_MIRROR_LOGREQ(0, bp, 937 "Request failed (error=%d).", 938 bp->bio_error); 939 } else { 940 G_MIRROR_LOGREQ(1, bp, 941 "Request failed (error=%d).", 942 bp->bio_error); 943 } 944 if (g_mirror_disconnect_on_failure && 945 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) 946 { 947 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 948 g_mirror_event_send(disk, 949 G_MIRROR_DISK_STATE_DISCONNECTED, 950 G_MIRROR_EVENT_DONTWAIT); 951 } 952 } 953 switch (pbp->bio_cmd) { 954 case BIO_DELETE: 955 case BIO_WRITE: 956 pbp->bio_inbed--; 957 pbp->bio_children--; 958 break; 959 } 960 } 961 g_destroy_bio(bp); 962 963 switch (pbp->bio_cmd) { 964 case BIO_READ: 965 if (pbp->bio_inbed < pbp->bio_children) 966 break; 967 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 1) 968 g_io_deliver(pbp, pbp->bio_error); 969 else { 970 pbp->bio_error = 0; 971 mtx_lock(&sc->sc_queue_mtx); 972 bioq_disksort(&sc->sc_queue, pbp); 973 mtx_unlock(&sc->sc_queue_mtx); 974 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 975 wakeup(sc); 976 } 977 break; 978 case BIO_DELETE: 979 case BIO_WRITE: 980 if (pbp->bio_children == 0) { 981 /* 982 * All requests failed. 983 */ 984 } else if (pbp->bio_inbed < pbp->bio_children) { 985 /* Do nothing. */ 986 break; 987 } else if (pbp->bio_children == pbp->bio_inbed) { 988 /* Some requests succeeded. */ 989 pbp->bio_error = 0; 990 pbp->bio_completed = pbp->bio_length; 991 } 992 bioq_remove(&sc->sc_inflight, pbp); 993 /* Release delayed sync requests if possible. */ 994 g_mirror_sync_release(sc); 995 g_io_deliver(pbp, pbp->bio_error); 996 break; 997 default: 998 KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd)); 999 break; 1000 } 1001} 1002 1003static void 1004g_mirror_sync_done(struct bio *bp) 1005{ 1006 struct g_mirror_softc *sc; 1007 1008 G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered."); 1009 sc = bp->bio_from->geom->softc; 1010 bp->bio_cflags = G_MIRROR_BIO_FLAG_SYNC; 1011 mtx_lock(&sc->sc_queue_mtx); 1012 bioq_disksort(&sc->sc_queue, bp); 1013 mtx_unlock(&sc->sc_queue_mtx); 1014 wakeup(sc); 1015} 1016 1017static void 1018g_mirror_kernel_dump(struct bio *bp) 1019{ 1020 struct g_mirror_softc *sc; 1021 struct g_mirror_disk *disk; 1022 struct bio *cbp; 1023 struct g_kerneldump *gkd; 1024 1025 /* 1026 * We configure dumping to the first component, because this component 1027 * will be used for reading with 'prefer' balance algorithm. 1028 * If the component with the higest priority is currently disconnected 1029 * we will not be able to read the dump after the reboot if it will be 1030 * connected and synchronized later. Can we do something better? 1031 */ 1032 sc = bp->bio_to->geom->softc; 1033 disk = LIST_FIRST(&sc->sc_disks); 1034 1035 gkd = (struct g_kerneldump *)bp->bio_data; 1036 if (gkd->length > bp->bio_to->mediasize) 1037 gkd->length = bp->bio_to->mediasize; 1038 cbp = g_clone_bio(bp); 1039 if (cbp == NULL) { 1040 g_io_deliver(bp, ENOMEM); 1041 return; 1042 } 1043 cbp->bio_done = g_std_done; 1044 g_io_request(cbp, disk->d_consumer); 1045 G_MIRROR_DEBUG(1, "Kernel dump will go to %s.", 1046 g_mirror_get_diskname(disk)); 1047} 1048 1049static void 1050g_mirror_flush(struct g_mirror_softc *sc, struct bio *bp) 1051{ 1052 struct bio_queue_head queue; 1053 struct g_mirror_disk *disk; 1054 struct g_consumer *cp; 1055 struct bio *cbp; 1056 1057 bioq_init(&queue); 1058 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1059 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1060 continue; 1061 cbp = g_clone_bio(bp); 1062 if (cbp == NULL) { 1063 while ((cbp = bioq_takefirst(&queue)) != NULL) 1064 g_destroy_bio(cbp); 1065 if (bp->bio_error == 0) 1066 bp->bio_error = ENOMEM; 1067 g_io_deliver(bp, bp->bio_error); 1068 return; 1069 } 1070 bioq_insert_tail(&queue, cbp); 1071 cbp->bio_done = g_mirror_flush_done; 1072 cbp->bio_caller1 = disk; 1073 cbp->bio_to = disk->d_consumer->provider; 1074 } 1075 while ((cbp = bioq_takefirst(&queue)) != NULL) { 1076 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1077 disk = cbp->bio_caller1; 1078 cbp->bio_caller1 = NULL; 1079 cp = disk->d_consumer; 1080 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1081 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1082 cp->acr, cp->acw, cp->ace)); 1083 g_io_request(cbp, disk->d_consumer); 1084 } 1085} 1086 1087static void 1088g_mirror_start(struct bio *bp) 1089{ 1090 struct g_mirror_softc *sc; 1091 1092 sc = bp->bio_to->geom->softc; 1093 /* 1094 * If sc == NULL or there are no valid disks, provider's error 1095 * should be set and g_mirror_start() should not be called at all. 1096 */ 1097 KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1098 ("Provider's error should be set (error=%d)(mirror=%s).", 1099 bp->bio_to->error, bp->bio_to->name)); 1100 G_MIRROR_LOGREQ(3, bp, "Request received."); 1101 1102 switch (bp->bio_cmd) { 1103 case BIO_READ: 1104 case BIO_WRITE: 1105 case BIO_DELETE: 1106 break; 1107 case BIO_FLUSH: 1108 g_mirror_flush(sc, bp); 1109 return; 1110 case BIO_GETATTR: 1111 if (g_handleattr_int(bp, "GEOM::candelete", 1)) 1112 return; 1113 else if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) { 1114 g_mirror_kernel_dump(bp); 1115 return; 1116 } 1117 /* FALLTHROUGH */ 1118 default: 1119 g_io_deliver(bp, EOPNOTSUPP); 1120 return; 1121 } 1122 mtx_lock(&sc->sc_queue_mtx); 1123 bioq_disksort(&sc->sc_queue, bp); 1124 mtx_unlock(&sc->sc_queue_mtx); 1125 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 1126 wakeup(sc); 1127} 1128 1129/* 1130 * Return TRUE if the given request is colliding with a in-progress 1131 * synchronization request. 1132 */ 1133static int 1134g_mirror_sync_collision(struct g_mirror_softc *sc, struct bio *bp) 1135{ 1136 struct g_mirror_disk *disk; 1137 struct bio *sbp; 1138 off_t rstart, rend, sstart, send; 1139 int i; 1140 1141 if (sc->sc_sync.ds_ndisks == 0) 1142 return (0); 1143 rstart = bp->bio_offset; 1144 rend = bp->bio_offset + bp->bio_length; 1145 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1146 if (disk->d_state != G_MIRROR_DISK_STATE_SYNCHRONIZING) 1147 continue; 1148 for (i = 0; i < g_mirror_syncreqs; i++) { 1149 sbp = disk->d_sync.ds_bios[i]; 1150 if (sbp == NULL) 1151 continue; 1152 sstart = sbp->bio_offset; 1153 send = sbp->bio_offset + sbp->bio_length; 1154 if (rend > sstart && rstart < send) 1155 return (1); 1156 } 1157 } 1158 return (0); 1159} 1160 1161/* 1162 * Return TRUE if the given sync request is colliding with a in-progress regular 1163 * request. 1164 */ 1165static int 1166g_mirror_regular_collision(struct g_mirror_softc *sc, struct bio *sbp) 1167{ 1168 off_t rstart, rend, sstart, send; 1169 struct bio *bp; 1170 1171 if (sc->sc_sync.ds_ndisks == 0) 1172 return (0); 1173 sstart = sbp->bio_offset; 1174 send = sbp->bio_offset + sbp->bio_length; 1175 TAILQ_FOREACH(bp, &sc->sc_inflight.queue, bio_queue) { 1176 rstart = bp->bio_offset; 1177 rend = bp->bio_offset + bp->bio_length; 1178 if (rend > sstart && rstart < send) 1179 return (1); 1180 } 1181 return (0); 1182} 1183 1184/* 1185 * Puts request onto delayed queue. 1186 */ 1187static void 1188g_mirror_regular_delay(struct g_mirror_softc *sc, struct bio *bp) 1189{ 1190 1191 G_MIRROR_LOGREQ(2, bp, "Delaying request."); 1192 bioq_insert_head(&sc->sc_regular_delayed, bp); 1193} 1194 1195/* 1196 * Puts synchronization request onto delayed queue. 1197 */ 1198static void 1199g_mirror_sync_delay(struct g_mirror_softc *sc, struct bio *bp) 1200{ 1201 1202 G_MIRROR_LOGREQ(2, bp, "Delaying synchronization request."); 1203 bioq_insert_tail(&sc->sc_sync_delayed, bp); 1204} 1205 1206/* 1207 * Releases delayed regular requests which don't collide anymore with sync 1208 * requests. 1209 */ 1210static void 1211g_mirror_regular_release(struct g_mirror_softc *sc) 1212{ 1213 struct bio *bp, *bp2; 1214 1215 TAILQ_FOREACH_SAFE(bp, &sc->sc_regular_delayed.queue, bio_queue, bp2) { 1216 if (g_mirror_sync_collision(sc, bp)) 1217 continue; 1218 bioq_remove(&sc->sc_regular_delayed, bp); 1219 G_MIRROR_LOGREQ(2, bp, "Releasing delayed request (%p).", bp); 1220 mtx_lock(&sc->sc_queue_mtx); 1221 bioq_insert_head(&sc->sc_queue, bp); 1222#if 0 1223 /* 1224 * wakeup() is not needed, because this function is called from 1225 * the worker thread. 1226 */ 1227 wakeup(&sc->sc_queue); 1228#endif 1229 mtx_unlock(&sc->sc_queue_mtx); 1230 } 1231} 1232 1233/* 1234 * Releases delayed sync requests which don't collide anymore with regular 1235 * requests. 1236 */ 1237static void 1238g_mirror_sync_release(struct g_mirror_softc *sc) 1239{ 1240 struct bio *bp, *bp2; 1241 1242 TAILQ_FOREACH_SAFE(bp, &sc->sc_sync_delayed.queue, bio_queue, bp2) { 1243 if (g_mirror_regular_collision(sc, bp)) 1244 continue; 1245 bioq_remove(&sc->sc_sync_delayed, bp); 1246 G_MIRROR_LOGREQ(2, bp, 1247 "Releasing delayed synchronization request."); 1248 g_io_request(bp, bp->bio_from); 1249 } 1250} 1251 1252/* 1253 * Handle synchronization requests. 1254 * Every synchronization request is two-steps process: first, READ request is 1255 * send to active provider and then WRITE request (with read data) to the provider 1256 * beeing synchronized. When WRITE is finished, new synchronization request is 1257 * send. 1258 */ 1259static void 1260g_mirror_sync_request(struct bio *bp) 1261{ 1262 struct g_mirror_softc *sc; 1263 struct g_mirror_disk *disk; 1264 1265 bp->bio_from->index--; 1266 sc = bp->bio_from->geom->softc; 1267 disk = bp->bio_from->private; 1268 if (disk == NULL) { 1269 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 1270 g_topology_lock(); 1271 g_mirror_kill_consumer(sc, bp->bio_from); 1272 g_topology_unlock(); 1273 free(bp->bio_data, M_MIRROR); 1274 g_destroy_bio(bp); 1275 sx_xlock(&sc->sc_lock); 1276 return; 1277 } 1278 1279 /* 1280 * Synchronization request. 1281 */ 1282 switch (bp->bio_cmd) { 1283 case BIO_READ: 1284 { 1285 struct g_consumer *cp; 1286 1287 if (bp->bio_error != 0) { 1288 G_MIRROR_LOGREQ(0, bp, 1289 "Synchronization request failed (error=%d).", 1290 bp->bio_error); 1291 g_destroy_bio(bp); 1292 return; 1293 } 1294 G_MIRROR_LOGREQ(3, bp, 1295 "Synchronization request half-finished."); 1296 bp->bio_cmd = BIO_WRITE; 1297 bp->bio_cflags = 0; 1298 cp = disk->d_consumer; 1299 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1300 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1301 cp->acr, cp->acw, cp->ace)); 1302 cp->index++; 1303 g_io_request(bp, cp); 1304 return; 1305 } 1306 case BIO_WRITE: 1307 { 1308 struct g_mirror_disk_sync *sync; 1309 off_t offset; 1310 void *data; 1311 int i; 1312 1313 if (bp->bio_error != 0) { 1314 G_MIRROR_LOGREQ(0, bp, 1315 "Synchronization request failed (error=%d).", 1316 bp->bio_error); 1317 g_destroy_bio(bp); 1318 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 1319 g_mirror_event_send(disk, 1320 G_MIRROR_DISK_STATE_DISCONNECTED, 1321 G_MIRROR_EVENT_DONTWAIT); 1322 return; 1323 } 1324 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished."); 1325 sync = &disk->d_sync; 1326 if (sync->ds_offset == sc->sc_mediasize || 1327 sync->ds_consumer == NULL || 1328 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1329 /* Don't send more synchronization requests. */ 1330 sync->ds_inflight--; 1331 if (sync->ds_bios != NULL) { 1332 i = (int)(uintptr_t)bp->bio_caller1; 1333 sync->ds_bios[i] = NULL; 1334 } 1335 free(bp->bio_data, M_MIRROR); 1336 g_destroy_bio(bp); 1337 if (sync->ds_inflight > 0) 1338 return; 1339 if (sync->ds_consumer == NULL || 1340 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1341 return; 1342 } 1343 /* Disk up-to-date, activate it. */ 1344 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE, 1345 G_MIRROR_EVENT_DONTWAIT); 1346 return; 1347 } 1348 1349 /* Send next synchronization request. */ 1350 data = bp->bio_data; 1351 bzero(bp, sizeof(*bp)); 1352 bp->bio_cmd = BIO_READ; 1353 bp->bio_offset = sync->ds_offset; 1354 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset); 1355 sync->ds_offset += bp->bio_length; 1356 bp->bio_done = g_mirror_sync_done; 1357 bp->bio_data = data; 1358 bp->bio_from = sync->ds_consumer; 1359 bp->bio_to = sc->sc_provider; 1360 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 1361 sync->ds_consumer->index++; 1362 /* 1363 * Delay the request if it is colliding with a regular request. 1364 */ 1365 if (g_mirror_regular_collision(sc, bp)) 1366 g_mirror_sync_delay(sc, bp); 1367 else 1368 g_io_request(bp, sync->ds_consumer); 1369 1370 /* Release delayed requests if possible. */ 1371 g_mirror_regular_release(sc); 1372 1373 /* Find the smallest offset */ 1374 offset = sc->sc_mediasize; 1375 for (i = 0; i < g_mirror_syncreqs; i++) { 1376 bp = sync->ds_bios[i]; 1377 if (bp->bio_offset < offset) 1378 offset = bp->bio_offset; 1379 } 1380 if (sync->ds_offset_done + (MAXPHYS * 100) < offset) { 1381 /* Update offset_done on every 100 blocks. */ 1382 sync->ds_offset_done = offset; 1383 g_mirror_update_metadata(disk); 1384 } 1385 return; 1386 } 1387 default: 1388 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1389 bp->bio_cmd, sc->sc_name)); 1390 break; 1391 } 1392} 1393 1394static void 1395g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp) 1396{ 1397 struct g_mirror_disk *disk; 1398 struct g_consumer *cp; 1399 struct bio *cbp; 1400 1401 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1402 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE) 1403 break; 1404 } 1405 if (disk == NULL) { 1406 if (bp->bio_error == 0) 1407 bp->bio_error = ENXIO; 1408 g_io_deliver(bp, bp->bio_error); 1409 return; 1410 } 1411 cbp = g_clone_bio(bp); 1412 if (cbp == NULL) { 1413 if (bp->bio_error == 0) 1414 bp->bio_error = ENOMEM; 1415 g_io_deliver(bp, bp->bio_error); 1416 return; 1417 } 1418 /* 1419 * Fill in the component buf structure. 1420 */ 1421 cp = disk->d_consumer; 1422 cbp->bio_done = g_mirror_done; 1423 cbp->bio_to = cp->provider; 1424 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1425 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1426 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1427 cp->acw, cp->ace)); 1428 cp->index++; 1429 g_io_request(cbp, cp); 1430} 1431 1432static void 1433g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp) 1434{ 1435 struct g_mirror_disk *disk; 1436 struct g_consumer *cp; 1437 struct bio *cbp; 1438 1439 disk = g_mirror_get_disk(sc); 1440 if (disk == NULL) { 1441 if (bp->bio_error == 0) 1442 bp->bio_error = ENXIO; 1443 g_io_deliver(bp, bp->bio_error); 1444 return; 1445 } 1446 cbp = g_clone_bio(bp); 1447 if (cbp == NULL) { 1448 if (bp->bio_error == 0) 1449 bp->bio_error = ENOMEM; 1450 g_io_deliver(bp, bp->bio_error); 1451 return; 1452 } 1453 /* 1454 * Fill in the component buf structure. 1455 */ 1456 cp = disk->d_consumer; 1457 cbp->bio_done = g_mirror_done; 1458 cbp->bio_to = cp->provider; 1459 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1460 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1461 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1462 cp->acw, cp->ace)); 1463 cp->index++; 1464 g_io_request(cbp, cp); 1465} 1466 1467#define TRACK_SIZE (1 * 1024 * 1024) 1468#define LOAD_SCALE 256 1469#define ABS(x) (((x) >= 0) ? (x) : (-(x))) 1470 1471static void 1472g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp) 1473{ 1474 struct g_mirror_disk *disk, *dp; 1475 struct g_consumer *cp; 1476 struct bio *cbp; 1477 int prio, best; 1478 1479 /* Find a disk with the smallest load. */ 1480 disk = NULL; 1481 best = INT_MAX; 1482 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1483 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1484 continue; 1485 prio = dp->load; 1486 /* If disk head is precisely in position - highly prefer it. */ 1487 if (dp->d_last_offset == bp->bio_offset) 1488 prio -= 2 * LOAD_SCALE; 1489 else 1490 /* If disk head is close to position - prefer it. */ 1491 if (ABS(dp->d_last_offset - bp->bio_offset) < TRACK_SIZE) 1492 prio -= 1 * LOAD_SCALE; 1493 if (prio <= best) { 1494 disk = dp; 1495 best = prio; 1496 } 1497 } 1498 KASSERT(disk != NULL, ("NULL disk for %s.", sc->sc_name)); 1499 cbp = g_clone_bio(bp); 1500 if (cbp == NULL) { 1501 if (bp->bio_error == 0) 1502 bp->bio_error = ENOMEM; 1503 g_io_deliver(bp, bp->bio_error); 1504 return; 1505 } 1506 /* 1507 * Fill in the component buf structure. 1508 */ 1509 cp = disk->d_consumer; 1510 cbp->bio_done = g_mirror_done; 1511 cbp->bio_to = cp->provider; 1512 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1513 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1514 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1515 cp->acw, cp->ace)); 1516 cp->index++; 1517 /* Remember last head position */ 1518 disk->d_last_offset = bp->bio_offset + bp->bio_length; 1519 /* Update loads. */ 1520 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1521 dp->load = (dp->d_consumer->index * LOAD_SCALE + 1522 dp->load * 7) / 8; 1523 } 1524 g_io_request(cbp, cp); 1525} 1526 1527static void 1528g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp) 1529{ 1530 struct bio_queue_head queue; 1531 struct g_mirror_disk *disk; 1532 struct g_consumer *cp; 1533 struct bio *cbp; 1534 off_t left, mod, offset, slice; 1535 u_char *data; 1536 u_int ndisks; 1537 1538 if (bp->bio_length <= sc->sc_slice) { 1539 g_mirror_request_round_robin(sc, bp); 1540 return; 1541 } 1542 ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE); 1543 slice = bp->bio_length / ndisks; 1544 mod = slice % sc->sc_provider->sectorsize; 1545 if (mod != 0) 1546 slice += sc->sc_provider->sectorsize - mod; 1547 /* 1548 * Allocate all bios before sending any request, so we can 1549 * return ENOMEM in nice and clean way. 1550 */ 1551 left = bp->bio_length; 1552 offset = bp->bio_offset; 1553 data = bp->bio_data; 1554 bioq_init(&queue); 1555 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1556 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1557 continue; 1558 cbp = g_clone_bio(bp); 1559 if (cbp == NULL) { 1560 while ((cbp = bioq_takefirst(&queue)) != NULL) 1561 bioq_remove(&queue, cbp); 1562 if (bp->bio_error == 0) 1563 bp->bio_error = ENOMEM; 1564 g_io_deliver(bp, bp->bio_error); 1565 return; 1566 } 1567 bioq_insert_tail(&queue, cbp); 1568 cbp->bio_done = g_mirror_done; 1569 cbp->bio_caller1 = disk; 1570 cbp->bio_to = disk->d_consumer->provider; 1571 cbp->bio_offset = offset; 1572 cbp->bio_data = data; 1573 cbp->bio_length = MIN(left, slice); 1574 left -= cbp->bio_length; 1575 if (left == 0) 1576 break; 1577 offset += cbp->bio_length; 1578 data += cbp->bio_length; 1579 } 1580 while ((cbp = bioq_takefirst(&queue)) != NULL) { 1581 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1582 disk = cbp->bio_caller1; 1583 cbp->bio_caller1 = NULL; 1584 cp = disk->d_consumer; 1585 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1586 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1587 cp->acr, cp->acw, cp->ace)); 1588 disk->d_consumer->index++; 1589 g_io_request(cbp, disk->d_consumer); 1590 } 1591} 1592 1593static void 1594g_mirror_register_request(struct bio *bp) 1595{ 1596 struct g_mirror_softc *sc; 1597 1598 sc = bp->bio_to->geom->softc; 1599 switch (bp->bio_cmd) { 1600 case BIO_READ: 1601 switch (sc->sc_balance) { 1602 case G_MIRROR_BALANCE_LOAD: 1603 g_mirror_request_load(sc, bp); 1604 break; 1605 case G_MIRROR_BALANCE_PREFER: 1606 g_mirror_request_prefer(sc, bp); 1607 break; 1608 case G_MIRROR_BALANCE_ROUND_ROBIN: 1609 g_mirror_request_round_robin(sc, bp); 1610 break; 1611 case G_MIRROR_BALANCE_SPLIT: 1612 g_mirror_request_split(sc, bp); 1613 break; 1614 } 1615 return; 1616 case BIO_WRITE: 1617 case BIO_DELETE: 1618 { 1619 struct g_mirror_disk *disk; 1620 struct g_mirror_disk_sync *sync; 1621 struct bio_queue_head queue; 1622 struct g_consumer *cp; 1623 struct bio *cbp; 1624 1625 /* 1626 * Delay the request if it is colliding with a synchronization 1627 * request. 1628 */ 1629 if (g_mirror_sync_collision(sc, bp)) { 1630 g_mirror_regular_delay(sc, bp); 1631 return; 1632 } 1633 1634 if (sc->sc_idle) 1635 g_mirror_unidle(sc); 1636 else 1637 sc->sc_last_write = time_uptime; 1638 1639 /* 1640 * Allocate all bios before sending any request, so we can 1641 * return ENOMEM in nice and clean way. 1642 */ 1643 bioq_init(&queue); 1644 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1645 sync = &disk->d_sync; 1646 switch (disk->d_state) { 1647 case G_MIRROR_DISK_STATE_ACTIVE: 1648 break; 1649 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 1650 if (bp->bio_offset >= sync->ds_offset) 1651 continue; 1652 break; 1653 default: 1654 continue; 1655 } 1656 if (bp->bio_cmd == BIO_DELETE && 1657 (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) == 0) 1658 continue; 1659 cbp = g_clone_bio(bp); 1660 if (cbp == NULL) { 1661 while ((cbp = bioq_takefirst(&queue)) != NULL) 1662 g_destroy_bio(cbp); 1663 if (bp->bio_error == 0) 1664 bp->bio_error = ENOMEM; 1665 g_io_deliver(bp, bp->bio_error); 1666 return; 1667 } 1668 bioq_insert_tail(&queue, cbp); 1669 cbp->bio_done = g_mirror_done; 1670 cp = disk->d_consumer; 1671 cbp->bio_caller1 = cp; 1672 cbp->bio_to = cp->provider; 1673 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1674 ("Consumer %s not opened (r%dw%de%d).", 1675 cp->provider->name, cp->acr, cp->acw, cp->ace)); 1676 } 1677 while ((cbp = bioq_takefirst(&queue)) != NULL) { 1678 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1679 cp = cbp->bio_caller1; 1680 cbp->bio_caller1 = NULL; 1681 cp->index++; 1682 sc->sc_writes++; 1683 g_io_request(cbp, cp); 1684 } 1685 /* 1686 * Put request onto inflight queue, so we can check if new 1687 * synchronization requests don't collide with it. 1688 */ 1689 bioq_insert_tail(&sc->sc_inflight, bp); 1690 /* 1691 * Bump syncid on first write. 1692 */ 1693 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) { 1694 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 1695 g_mirror_bump_syncid(sc); 1696 } 1697 return; 1698 } 1699 default: 1700 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1701 bp->bio_cmd, sc->sc_name)); 1702 break; 1703 } 1704} 1705 1706static int 1707g_mirror_can_destroy(struct g_mirror_softc *sc) 1708{ 1709 struct g_geom *gp; 1710 struct g_consumer *cp; 1711 1712 g_topology_assert(); 1713 gp = sc->sc_geom; 1714 if (gp->softc == NULL) 1715 return (1); 1716 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_TASTING) != 0) 1717 return (0); 1718 LIST_FOREACH(cp, &gp->consumer, consumer) { 1719 if (g_mirror_is_busy(sc, cp)) 1720 return (0); 1721 } 1722 gp = sc->sc_sync.ds_geom; 1723 LIST_FOREACH(cp, &gp->consumer, consumer) { 1724 if (g_mirror_is_busy(sc, cp)) 1725 return (0); 1726 } 1727 G_MIRROR_DEBUG(2, "No I/O requests for %s, it can be destroyed.", 1728 sc->sc_name); 1729 return (1); 1730} 1731 1732static int 1733g_mirror_try_destroy(struct g_mirror_softc *sc) 1734{ 1735 1736 if (sc->sc_rootmount != NULL) { 1737 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 1738 sc->sc_rootmount); 1739 root_mount_rel(sc->sc_rootmount); 1740 sc->sc_rootmount = NULL; 1741 } 1742 g_topology_lock(); 1743 if (!g_mirror_can_destroy(sc)) { 1744 g_topology_unlock(); 1745 return (0); 1746 } 1747 sc->sc_geom->softc = NULL; 1748 sc->sc_sync.ds_geom->softc = NULL; 1749 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WAIT) != 0) { 1750 g_topology_unlock(); 1751 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1752 &sc->sc_worker); 1753 /* Unlock sc_lock here, as it can be destroyed after wakeup. */ 1754 sx_xunlock(&sc->sc_lock); 1755 wakeup(&sc->sc_worker); 1756 sc->sc_worker = NULL; 1757 } else { 1758 g_topology_unlock(); 1759 g_mirror_destroy_device(sc); 1760 free(sc, M_MIRROR); 1761 } 1762 return (1); 1763} 1764 1765/* 1766 * Worker thread. 1767 */ 1768static void 1769g_mirror_worker(void *arg) 1770{ 1771 struct g_mirror_softc *sc; 1772 struct g_mirror_event *ep; 1773 struct bio *bp; 1774 int timeout; 1775 1776 sc = arg; 1777 thread_lock(curthread); 1778 sched_prio(curthread, PRIBIO); 1779 thread_unlock(curthread); 1780 1781 sx_xlock(&sc->sc_lock); 1782 for (;;) { 1783 G_MIRROR_DEBUG(5, "%s: Let's see...", __func__); 1784 /* 1785 * First take a look at events. 1786 * This is important to handle events before any I/O requests. 1787 */ 1788 ep = g_mirror_event_get(sc); 1789 if (ep != NULL) { 1790 g_mirror_event_remove(sc, ep); 1791 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) { 1792 /* Update only device status. */ 1793 G_MIRROR_DEBUG(3, 1794 "Running event for device %s.", 1795 sc->sc_name); 1796 ep->e_error = 0; 1797 g_mirror_update_device(sc, 1); 1798 } else { 1799 /* Update disk status. */ 1800 G_MIRROR_DEBUG(3, "Running event for disk %s.", 1801 g_mirror_get_diskname(ep->e_disk)); 1802 ep->e_error = g_mirror_update_disk(ep->e_disk, 1803 ep->e_state); 1804 if (ep->e_error == 0) 1805 g_mirror_update_device(sc, 0); 1806 } 1807 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) { 1808 KASSERT(ep->e_error == 0, 1809 ("Error cannot be handled.")); 1810 g_mirror_event_free(ep); 1811 } else { 1812 ep->e_flags |= G_MIRROR_EVENT_DONE; 1813 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1814 ep); 1815 mtx_lock(&sc->sc_events_mtx); 1816 wakeup(ep); 1817 mtx_unlock(&sc->sc_events_mtx); 1818 } 1819 if ((sc->sc_flags & 1820 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1821 if (g_mirror_try_destroy(sc)) { 1822 curthread->td_pflags &= ~TDP_GEOM; 1823 G_MIRROR_DEBUG(1, "Thread exiting."); 1824 kproc_exit(0); 1825 } 1826 } 1827 G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__); 1828 continue; 1829 } 1830 /* 1831 * Check if we can mark array as CLEAN and if we can't take 1832 * how much seconds should we wait. 1833 */ 1834 timeout = g_mirror_idle(sc, -1); 1835 /* 1836 * Now I/O requests. 1837 */ 1838 /* Get first request from the queue. */ 1839 mtx_lock(&sc->sc_queue_mtx); 1840 bp = bioq_first(&sc->sc_queue); 1841 if (bp == NULL) { 1842 if ((sc->sc_flags & 1843 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1844 mtx_unlock(&sc->sc_queue_mtx); 1845 if (g_mirror_try_destroy(sc)) { 1846 curthread->td_pflags &= ~TDP_GEOM; 1847 G_MIRROR_DEBUG(1, "Thread exiting."); 1848 kproc_exit(0); 1849 } 1850 mtx_lock(&sc->sc_queue_mtx); 1851 } 1852 sx_xunlock(&sc->sc_lock); 1853 /* 1854 * XXX: We can miss an event here, because an event 1855 * can be added without sx-device-lock and without 1856 * mtx-queue-lock. Maybe I should just stop using 1857 * dedicated mutex for events synchronization and 1858 * stick with the queue lock? 1859 * The event will hang here until next I/O request 1860 * or next event is received. 1861 */ 1862 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w1", 1863 timeout * hz); 1864 sx_xlock(&sc->sc_lock); 1865 G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__); 1866 continue; 1867 } 1868 bioq_remove(&sc->sc_queue, bp); 1869 mtx_unlock(&sc->sc_queue_mtx); 1870 1871 if (bp->bio_from->geom == sc->sc_sync.ds_geom && 1872 (bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) { 1873 g_mirror_sync_request(bp); /* READ */ 1874 } else if (bp->bio_to != sc->sc_provider) { 1875 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0) 1876 g_mirror_regular_request(bp); 1877 else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 1878 g_mirror_sync_request(bp); /* WRITE */ 1879 else { 1880 KASSERT(0, 1881 ("Invalid request cflags=0x%hhx to=%s.", 1882 bp->bio_cflags, bp->bio_to->name)); 1883 } 1884 } else { 1885 g_mirror_register_request(bp); 1886 } 1887 G_MIRROR_DEBUG(5, "%s: I'm here 9.", __func__); 1888 } 1889} 1890 1891static void 1892g_mirror_update_idle(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 1893{ 1894 1895 sx_assert(&sc->sc_lock, SX_LOCKED); 1896 1897 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 1898 return; 1899 if (!sc->sc_idle && (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) { 1900 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.", 1901 g_mirror_get_diskname(disk), sc->sc_name); 1902 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1903 } else if (sc->sc_idle && 1904 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 1905 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.", 1906 g_mirror_get_diskname(disk), sc->sc_name); 1907 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 1908 } 1909} 1910 1911static void 1912g_mirror_sync_start(struct g_mirror_disk *disk) 1913{ 1914 struct g_mirror_softc *sc; 1915 struct g_consumer *cp; 1916 struct bio *bp; 1917 int error, i; 1918 1919 g_topology_assert_not(); 1920 sc = disk->d_softc; 1921 sx_assert(&sc->sc_lock, SX_LOCKED); 1922 1923 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 1924 ("Disk %s is not marked for synchronization.", 1925 g_mirror_get_diskname(disk))); 1926 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1927 ("Device not in RUNNING state (%s, %u).", sc->sc_name, 1928 sc->sc_state)); 1929 1930 sx_xunlock(&sc->sc_lock); 1931 g_topology_lock(); 1932 cp = g_new_consumer(sc->sc_sync.ds_geom); 1933 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 1934 error = g_attach(cp, sc->sc_provider); 1935 KASSERT(error == 0, 1936 ("Cannot attach to %s (error=%d).", sc->sc_name, error)); 1937 error = g_access(cp, 1, 0, 0); 1938 KASSERT(error == 0, ("Cannot open %s (error=%d).", sc->sc_name, error)); 1939 g_topology_unlock(); 1940 sx_xlock(&sc->sc_lock); 1941 1942 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name, 1943 g_mirror_get_diskname(disk)); 1944 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) == 0) 1945 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1946 KASSERT(disk->d_sync.ds_consumer == NULL, 1947 ("Sync consumer already exists (device=%s, disk=%s).", 1948 sc->sc_name, g_mirror_get_diskname(disk))); 1949 1950 disk->d_sync.ds_consumer = cp; 1951 disk->d_sync.ds_consumer->private = disk; 1952 disk->d_sync.ds_consumer->index = 0; 1953 1954 /* 1955 * Allocate memory for synchronization bios and initialize them. 1956 */ 1957 disk->d_sync.ds_bios = malloc(sizeof(struct bio *) * g_mirror_syncreqs, 1958 M_MIRROR, M_WAITOK); 1959 for (i = 0; i < g_mirror_syncreqs; i++) { 1960 bp = g_alloc_bio(); 1961 disk->d_sync.ds_bios[i] = bp; 1962 bp->bio_parent = NULL; 1963 bp->bio_cmd = BIO_READ; 1964 bp->bio_data = malloc(MAXPHYS, M_MIRROR, M_WAITOK); 1965 bp->bio_cflags = 0; 1966 bp->bio_offset = disk->d_sync.ds_offset; 1967 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset); 1968 disk->d_sync.ds_offset += bp->bio_length; 1969 bp->bio_done = g_mirror_sync_done; 1970 bp->bio_from = disk->d_sync.ds_consumer; 1971 bp->bio_to = sc->sc_provider; 1972 bp->bio_caller1 = (void *)(uintptr_t)i; 1973 } 1974 1975 /* Increase the number of disks in SYNCHRONIZING state. */ 1976 sc->sc_sync.ds_ndisks++; 1977 /* Set the number of in-flight synchronization requests. */ 1978 disk->d_sync.ds_inflight = g_mirror_syncreqs; 1979 1980 /* 1981 * Fire off first synchronization requests. 1982 */ 1983 for (i = 0; i < g_mirror_syncreqs; i++) { 1984 bp = disk->d_sync.ds_bios[i]; 1985 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 1986 disk->d_sync.ds_consumer->index++; 1987 /* 1988 * Delay the request if it is colliding with a regular request. 1989 */ 1990 if (g_mirror_regular_collision(sc, bp)) 1991 g_mirror_sync_delay(sc, bp); 1992 else 1993 g_io_request(bp, disk->d_sync.ds_consumer); 1994 } 1995} 1996 1997/* 1998 * Stop synchronization process. 1999 * type: 0 - synchronization finished 2000 * 1 - synchronization stopped 2001 */ 2002static void 2003g_mirror_sync_stop(struct g_mirror_disk *disk, int type) 2004{ 2005 struct g_mirror_softc *sc; 2006 struct g_consumer *cp; 2007 2008 g_topology_assert_not(); 2009 sc = disk->d_softc; 2010 sx_assert(&sc->sc_lock, SX_LOCKED); 2011 2012 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2013 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2014 g_mirror_disk_state2str(disk->d_state))); 2015 if (disk->d_sync.ds_consumer == NULL) 2016 return; 2017 2018 if (type == 0) { 2019 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.", 2020 sc->sc_name, g_mirror_get_diskname(disk)); 2021 } else /* if (type == 1) */ { 2022 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.", 2023 sc->sc_name, g_mirror_get_diskname(disk)); 2024 } 2025 free(disk->d_sync.ds_bios, M_MIRROR); 2026 disk->d_sync.ds_bios = NULL; 2027 cp = disk->d_sync.ds_consumer; 2028 disk->d_sync.ds_consumer = NULL; 2029 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2030 sc->sc_sync.ds_ndisks--; 2031 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 2032 g_topology_lock(); 2033 g_mirror_kill_consumer(sc, cp); 2034 g_topology_unlock(); 2035 sx_xlock(&sc->sc_lock); 2036} 2037 2038static void 2039g_mirror_launch_provider(struct g_mirror_softc *sc) 2040{ 2041 struct g_mirror_disk *disk; 2042 struct g_provider *pp, *dp; 2043 2044 sx_assert(&sc->sc_lock, SX_LOCKED); 2045 2046 g_topology_lock(); 2047 pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name); 2048 pp->flags |= G_PF_DIRECT_RECEIVE; 2049 pp->mediasize = sc->sc_mediasize; 2050 pp->sectorsize = sc->sc_sectorsize; 2051 pp->stripesize = 0; 2052 pp->stripeoffset = 0; 2053 2054 /* Splitting of unmapped BIO's could work but isn't implemented now */ 2055 if (sc->sc_balance != G_MIRROR_BALANCE_SPLIT) 2056 pp->flags |= G_PF_ACCEPT_UNMAPPED; 2057 2058 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2059 if (disk->d_consumer && disk->d_consumer->provider) { 2060 dp = disk->d_consumer->provider; 2061 if (dp->stripesize > pp->stripesize) { 2062 pp->stripesize = dp->stripesize; 2063 pp->stripeoffset = dp->stripeoffset; 2064 } 2065 /* A provider underneath us doesn't support unmapped */ 2066 if ((dp->flags & G_PF_ACCEPT_UNMAPPED) == 0) { 2067 G_MIRROR_DEBUG(0, "Cancelling unmapped " 2068 "because of %s.", dp->name); 2069 pp->flags &= ~G_PF_ACCEPT_UNMAPPED; 2070 } 2071 } 2072 } 2073 sc->sc_provider = pp; 2074 g_error_provider(pp, 0); 2075 g_topology_unlock(); 2076 G_MIRROR_DEBUG(0, "Device %s launched (%u/%u).", pp->name, 2077 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE), sc->sc_ndisks); 2078 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2079 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2080 g_mirror_sync_start(disk); 2081 } 2082} 2083 2084static void 2085g_mirror_destroy_provider(struct g_mirror_softc *sc) 2086{ 2087 struct g_mirror_disk *disk; 2088 struct bio *bp; 2089 2090 g_topology_assert_not(); 2091 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).", 2092 sc->sc_name)); 2093 2094 g_topology_lock(); 2095 g_error_provider(sc->sc_provider, ENXIO); 2096 mtx_lock(&sc->sc_queue_mtx); 2097 while ((bp = bioq_takefirst(&sc->sc_queue)) != NULL) 2098 g_io_deliver(bp, ENXIO); 2099 mtx_unlock(&sc->sc_queue_mtx); 2100 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", sc->sc_name, 2101 sc->sc_provider->name); 2102 sc->sc_provider->flags |= G_PF_WITHER; 2103 g_orphan_provider(sc->sc_provider, ENXIO); 2104 g_topology_unlock(); 2105 sc->sc_provider = NULL; 2106 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2107 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2108 g_mirror_sync_stop(disk, 1); 2109 } 2110} 2111 2112static void 2113g_mirror_go(void *arg) 2114{ 2115 struct g_mirror_softc *sc; 2116 2117 sc = arg; 2118 G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name); 2119 g_mirror_event_send(sc, 0, 2120 G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE); 2121} 2122 2123static u_int 2124g_mirror_determine_state(struct g_mirror_disk *disk) 2125{ 2126 struct g_mirror_softc *sc; 2127 u_int state; 2128 2129 sc = disk->d_softc; 2130 if (sc->sc_syncid == disk->d_sync.ds_syncid) { 2131 if ((disk->d_flags & 2132 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2133 /* Disk does not need synchronization. */ 2134 state = G_MIRROR_DISK_STATE_ACTIVE; 2135 } else { 2136 if ((sc->sc_flags & 2137 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2138 (disk->d_flags & 2139 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2140 /* 2141 * We can start synchronization from 2142 * the stored offset. 2143 */ 2144 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2145 } else { 2146 state = G_MIRROR_DISK_STATE_STALE; 2147 } 2148 } 2149 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) { 2150 /* 2151 * Reset all synchronization data for this disk, 2152 * because if it even was synchronized, it was 2153 * synchronized to disks with different syncid. 2154 */ 2155 disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2156 disk->d_sync.ds_offset = 0; 2157 disk->d_sync.ds_offset_done = 0; 2158 disk->d_sync.ds_syncid = sc->sc_syncid; 2159 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2160 (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2161 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2162 } else { 2163 state = G_MIRROR_DISK_STATE_STALE; 2164 } 2165 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ { 2166 /* 2167 * Not good, NOT GOOD! 2168 * It means that mirror was started on stale disks 2169 * and more fresh disk just arrive. 2170 * If there were writes, mirror is broken, sorry. 2171 * I think the best choice here is don't touch 2172 * this disk and inform the user loudly. 2173 */ 2174 G_MIRROR_DEBUG(0, "Device %s was started before the freshest " 2175 "disk (%s) arrives!! It will not be connected to the " 2176 "running device.", sc->sc_name, 2177 g_mirror_get_diskname(disk)); 2178 g_mirror_destroy_disk(disk); 2179 state = G_MIRROR_DISK_STATE_NONE; 2180 /* Return immediately, because disk was destroyed. */ 2181 return (state); 2182 } 2183 G_MIRROR_DEBUG(3, "State for %s disk: %s.", 2184 g_mirror_get_diskname(disk), g_mirror_disk_state2str(state)); 2185 return (state); 2186} 2187 2188/* 2189 * Update device state. 2190 */ 2191static void 2192g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force) 2193{ 2194 struct g_mirror_disk *disk; 2195 u_int state; 2196 2197 sx_assert(&sc->sc_lock, SX_XLOCKED); 2198 2199 switch (sc->sc_state) { 2200 case G_MIRROR_DEVICE_STATE_STARTING: 2201 { 2202 struct g_mirror_disk *pdisk, *tdisk; 2203 u_int dirty, ndisks, genid, syncid; 2204 2205 KASSERT(sc->sc_provider == NULL, 2206 ("Non-NULL provider in STARTING state (%s).", sc->sc_name)); 2207 /* 2208 * Are we ready? We are, if all disks are connected or 2209 * if we have any disks and 'force' is true. 2210 */ 2211 ndisks = g_mirror_ndisks(sc, -1); 2212 if (sc->sc_ndisks == ndisks || (force && ndisks > 0)) { 2213 ; 2214 } else if (ndisks == 0) { 2215 /* 2216 * Disks went down in starting phase, so destroy 2217 * device. 2218 */ 2219 callout_drain(&sc->sc_callout); 2220 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2221 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 2222 sc->sc_rootmount); 2223 root_mount_rel(sc->sc_rootmount); 2224 sc->sc_rootmount = NULL; 2225 return; 2226 } else { 2227 return; 2228 } 2229 2230 /* 2231 * Activate all disks with the biggest syncid. 2232 */ 2233 if (force) { 2234 /* 2235 * If 'force' is true, we have been called due to 2236 * timeout, so don't bother canceling timeout. 2237 */ 2238 ndisks = 0; 2239 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2240 if ((disk->d_flags & 2241 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2242 ndisks++; 2243 } 2244 } 2245 if (ndisks == 0) { 2246 /* No valid disks found, destroy device. */ 2247 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2248 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2249 __LINE__, sc->sc_rootmount); 2250 root_mount_rel(sc->sc_rootmount); 2251 sc->sc_rootmount = NULL; 2252 return; 2253 } 2254 } else { 2255 /* Cancel timeout. */ 2256 callout_drain(&sc->sc_callout); 2257 } 2258 2259 /* 2260 * Find the biggest genid. 2261 */ 2262 genid = 0; 2263 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2264 if (disk->d_genid > genid) 2265 genid = disk->d_genid; 2266 } 2267 sc->sc_genid = genid; 2268 /* 2269 * Remove all disks without the biggest genid. 2270 */ 2271 LIST_FOREACH_SAFE(disk, &sc->sc_disks, d_next, tdisk) { 2272 if (disk->d_genid < genid) { 2273 G_MIRROR_DEBUG(0, 2274 "Component %s (device %s) broken, skipping.", 2275 g_mirror_get_diskname(disk), sc->sc_name); 2276 g_mirror_destroy_disk(disk); 2277 } 2278 } 2279 2280 /* 2281 * Find the biggest syncid. 2282 */ 2283 syncid = 0; 2284 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2285 if (disk->d_sync.ds_syncid > syncid) 2286 syncid = disk->d_sync.ds_syncid; 2287 } 2288 2289 /* 2290 * Here we need to look for dirty disks and if all disks 2291 * with the biggest syncid are dirty, we have to choose 2292 * one with the biggest priority and rebuild the rest. 2293 */ 2294 /* 2295 * Find the number of dirty disks with the biggest syncid. 2296 * Find the number of disks with the biggest syncid. 2297 * While here, find a disk with the biggest priority. 2298 */ 2299 dirty = ndisks = 0; 2300 pdisk = NULL; 2301 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2302 if (disk->d_sync.ds_syncid != syncid) 2303 continue; 2304 if ((disk->d_flags & 2305 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2306 continue; 2307 } 2308 ndisks++; 2309 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 2310 dirty++; 2311 if (pdisk == NULL || 2312 pdisk->d_priority < disk->d_priority) { 2313 pdisk = disk; 2314 } 2315 } 2316 } 2317 if (dirty == 0) { 2318 /* No dirty disks at all, great. */ 2319 } else if (dirty == ndisks) { 2320 /* 2321 * Force synchronization for all dirty disks except one 2322 * with the biggest priority. 2323 */ 2324 KASSERT(pdisk != NULL, ("pdisk == NULL")); 2325 G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a " 2326 "master disk for synchronization.", 2327 g_mirror_get_diskname(pdisk), sc->sc_name); 2328 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2329 if (disk->d_sync.ds_syncid != syncid) 2330 continue; 2331 if ((disk->d_flags & 2332 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2333 continue; 2334 } 2335 KASSERT((disk->d_flags & 2336 G_MIRROR_DISK_FLAG_DIRTY) != 0, 2337 ("Disk %s isn't marked as dirty.", 2338 g_mirror_get_diskname(disk))); 2339 /* Skip the disk with the biggest priority. */ 2340 if (disk == pdisk) 2341 continue; 2342 disk->d_sync.ds_syncid = 0; 2343 } 2344 } else if (dirty < ndisks) { 2345 /* 2346 * Force synchronization for all dirty disks. 2347 * We have some non-dirty disks. 2348 */ 2349 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2350 if (disk->d_sync.ds_syncid != syncid) 2351 continue; 2352 if ((disk->d_flags & 2353 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2354 continue; 2355 } 2356 if ((disk->d_flags & 2357 G_MIRROR_DISK_FLAG_DIRTY) == 0) { 2358 continue; 2359 } 2360 disk->d_sync.ds_syncid = 0; 2361 } 2362 } 2363 2364 /* Reset hint. */ 2365 sc->sc_hint = NULL; 2366 sc->sc_syncid = syncid; 2367 if (force) { 2368 /* Remember to bump syncid on first write. */ 2369 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2370 } 2371 state = G_MIRROR_DEVICE_STATE_RUNNING; 2372 G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.", 2373 sc->sc_name, g_mirror_device_state2str(sc->sc_state), 2374 g_mirror_device_state2str(state)); 2375 sc->sc_state = state; 2376 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2377 state = g_mirror_determine_state(disk); 2378 g_mirror_event_send(disk, state, 2379 G_MIRROR_EVENT_DONTWAIT); 2380 if (state == G_MIRROR_DISK_STATE_STALE) 2381 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2382 } 2383 break; 2384 } 2385 case G_MIRROR_DEVICE_STATE_RUNNING: 2386 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 && 2387 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2388 /* 2389 * No active disks or no disks at all, 2390 * so destroy device. 2391 */ 2392 if (sc->sc_provider != NULL) 2393 g_mirror_destroy_provider(sc); 2394 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2395 break; 2396 } else if (g_mirror_ndisks(sc, 2397 G_MIRROR_DISK_STATE_ACTIVE) > 0 && 2398 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2399 /* 2400 * We have active disks, launch provider if it doesn't 2401 * exist. 2402 */ 2403 if (sc->sc_provider == NULL) 2404 g_mirror_launch_provider(sc); 2405 if (sc->sc_rootmount != NULL) { 2406 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2407 __LINE__, sc->sc_rootmount); 2408 root_mount_rel(sc->sc_rootmount); 2409 sc->sc_rootmount = NULL; 2410 } 2411 } 2412 /* 2413 * Genid should be bumped immediately, so do it here. 2414 */ 2415 if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID) != 0) { 2416 sc->sc_bump_id &= ~G_MIRROR_BUMP_GENID; 2417 g_mirror_bump_genid(sc); 2418 } 2419 break; 2420 default: 2421 KASSERT(1 == 0, ("Wrong device state (%s, %s).", 2422 sc->sc_name, g_mirror_device_state2str(sc->sc_state))); 2423 break; 2424 } 2425} 2426 2427/* 2428 * Update disk state and device state if needed. 2429 */ 2430#define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \ 2431 "Disk %s state changed from %s to %s (device %s).", \ 2432 g_mirror_get_diskname(disk), \ 2433 g_mirror_disk_state2str(disk->d_state), \ 2434 g_mirror_disk_state2str(state), sc->sc_name) 2435static int 2436g_mirror_update_disk(struct g_mirror_disk *disk, u_int state) 2437{ 2438 struct g_mirror_softc *sc; 2439 2440 sc = disk->d_softc; 2441 sx_assert(&sc->sc_lock, SX_XLOCKED); 2442 2443again: 2444 G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.", 2445 g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state), 2446 g_mirror_disk_state2str(state)); 2447 switch (state) { 2448 case G_MIRROR_DISK_STATE_NEW: 2449 /* 2450 * Possible scenarios: 2451 * 1. New disk arrive. 2452 */ 2453 /* Previous state should be NONE. */ 2454 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE, 2455 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2456 g_mirror_disk_state2str(disk->d_state))); 2457 DISK_STATE_CHANGED(); 2458 2459 disk->d_state = state; 2460 if (LIST_EMPTY(&sc->sc_disks)) 2461 LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next); 2462 else { 2463 struct g_mirror_disk *dp; 2464 2465 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 2466 if (disk->d_priority >= dp->d_priority) { 2467 LIST_INSERT_BEFORE(dp, disk, d_next); 2468 dp = NULL; 2469 break; 2470 } 2471 if (LIST_NEXT(dp, d_next) == NULL) 2472 break; 2473 } 2474 if (dp != NULL) 2475 LIST_INSERT_AFTER(dp, disk, d_next); 2476 } 2477 G_MIRROR_DEBUG(1, "Device %s: provider %s detected.", 2478 sc->sc_name, g_mirror_get_diskname(disk)); 2479 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 2480 break; 2481 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2482 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2483 g_mirror_device_state2str(sc->sc_state), 2484 g_mirror_get_diskname(disk), 2485 g_mirror_disk_state2str(disk->d_state))); 2486 state = g_mirror_determine_state(disk); 2487 if (state != G_MIRROR_DISK_STATE_NONE) 2488 goto again; 2489 break; 2490 case G_MIRROR_DISK_STATE_ACTIVE: 2491 /* 2492 * Possible scenarios: 2493 * 1. New disk does not need synchronization. 2494 * 2. Synchronization process finished successfully. 2495 */ 2496 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2497 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2498 g_mirror_device_state2str(sc->sc_state), 2499 g_mirror_get_diskname(disk), 2500 g_mirror_disk_state2str(disk->d_state))); 2501 /* Previous state should be NEW or SYNCHRONIZING. */ 2502 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW || 2503 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2504 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2505 g_mirror_disk_state2str(disk->d_state))); 2506 DISK_STATE_CHANGED(); 2507 2508 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2509 disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2510 disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC; 2511 g_mirror_sync_stop(disk, 0); 2512 } 2513 disk->d_state = state; 2514 disk->d_sync.ds_offset = 0; 2515 disk->d_sync.ds_offset_done = 0; 2516 g_mirror_update_idle(sc, disk); 2517 g_mirror_update_metadata(disk); 2518 G_MIRROR_DEBUG(1, "Device %s: provider %s activated.", 2519 sc->sc_name, g_mirror_get_diskname(disk)); 2520 break; 2521 case G_MIRROR_DISK_STATE_STALE: 2522 /* 2523 * Possible scenarios: 2524 * 1. Stale disk was connected. 2525 */ 2526 /* Previous state should be NEW. */ 2527 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2528 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2529 g_mirror_disk_state2str(disk->d_state))); 2530 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2531 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2532 g_mirror_device_state2str(sc->sc_state), 2533 g_mirror_get_diskname(disk), 2534 g_mirror_disk_state2str(disk->d_state))); 2535 /* 2536 * STALE state is only possible if device is marked 2537 * NOAUTOSYNC. 2538 */ 2539 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0, 2540 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2541 g_mirror_device_state2str(sc->sc_state), 2542 g_mirror_get_diskname(disk), 2543 g_mirror_disk_state2str(disk->d_state))); 2544 DISK_STATE_CHANGED(); 2545 2546 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2547 disk->d_state = state; 2548 g_mirror_update_metadata(disk); 2549 G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.", 2550 sc->sc_name, g_mirror_get_diskname(disk)); 2551 break; 2552 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 2553 /* 2554 * Possible scenarios: 2555 * 1. Disk which needs synchronization was connected. 2556 */ 2557 /* Previous state should be NEW. */ 2558 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2559 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2560 g_mirror_disk_state2str(disk->d_state))); 2561 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2562 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2563 g_mirror_device_state2str(sc->sc_state), 2564 g_mirror_get_diskname(disk), 2565 g_mirror_disk_state2str(disk->d_state))); 2566 DISK_STATE_CHANGED(); 2567 2568 if (disk->d_state == G_MIRROR_DISK_STATE_NEW) 2569 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2570 disk->d_state = state; 2571 if (sc->sc_provider != NULL) { 2572 g_mirror_sync_start(disk); 2573 g_mirror_update_metadata(disk); 2574 } 2575 break; 2576 case G_MIRROR_DISK_STATE_DISCONNECTED: 2577 /* 2578 * Possible scenarios: 2579 * 1. Device wasn't running yet, but disk disappear. 2580 * 2. Disk was active and disapppear. 2581 * 3. Disk disappear during synchronization process. 2582 */ 2583 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) { 2584 /* 2585 * Previous state should be ACTIVE, STALE or 2586 * SYNCHRONIZING. 2587 */ 2588 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 2589 disk->d_state == G_MIRROR_DISK_STATE_STALE || 2590 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2591 ("Wrong disk state (%s, %s).", 2592 g_mirror_get_diskname(disk), 2593 g_mirror_disk_state2str(disk->d_state))); 2594 } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) { 2595 /* Previous state should be NEW. */ 2596 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2597 ("Wrong disk state (%s, %s).", 2598 g_mirror_get_diskname(disk), 2599 g_mirror_disk_state2str(disk->d_state))); 2600 /* 2601 * Reset bumping syncid if disk disappeared in STARTING 2602 * state. 2603 */ 2604 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) 2605 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 2606#ifdef INVARIANTS 2607 } else { 2608 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).", 2609 sc->sc_name, 2610 g_mirror_device_state2str(sc->sc_state), 2611 g_mirror_get_diskname(disk), 2612 g_mirror_disk_state2str(disk->d_state))); 2613#endif 2614 } 2615 DISK_STATE_CHANGED(); 2616 G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.", 2617 sc->sc_name, g_mirror_get_diskname(disk)); 2618 2619 g_mirror_destroy_disk(disk); 2620 break; 2621 case G_MIRROR_DISK_STATE_DESTROY: 2622 { 2623 int error; 2624 2625 error = g_mirror_clear_metadata(disk); 2626 if (error != 0) 2627 return (error); 2628 DISK_STATE_CHANGED(); 2629 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", 2630 sc->sc_name, g_mirror_get_diskname(disk)); 2631 2632 g_mirror_destroy_disk(disk); 2633 sc->sc_ndisks--; 2634 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2635 g_mirror_update_metadata(disk); 2636 } 2637 break; 2638 } 2639 default: 2640 KASSERT(1 == 0, ("Unknown state (%u).", state)); 2641 break; 2642 } 2643 return (0); 2644} 2645#undef DISK_STATE_CHANGED 2646 2647int 2648g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md) 2649{ 2650 struct g_provider *pp; 2651 u_char *buf; 2652 int error; 2653 2654 g_topology_assert(); 2655 2656 error = g_access(cp, 1, 0, 0); 2657 if (error != 0) 2658 return (error); 2659 pp = cp->provider; 2660 g_topology_unlock(); 2661 /* Metadata are stored on last sector. */ 2662 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 2663 &error); 2664 g_topology_lock(); 2665 g_access(cp, -1, 0, 0); 2666 if (buf == NULL) { 2667 G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).", 2668 cp->provider->name, error); 2669 return (error); 2670 } 2671 2672 /* Decode metadata. */ 2673 error = mirror_metadata_decode(buf, md); 2674 g_free(buf); 2675 if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0) 2676 return (EINVAL); 2677 if (md->md_version > G_MIRROR_VERSION) { 2678 G_MIRROR_DEBUG(0, 2679 "Kernel module is too old to handle metadata from %s.", 2680 cp->provider->name); 2681 return (EINVAL); 2682 } 2683 if (error != 0) { 2684 G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.", 2685 cp->provider->name); 2686 return (error); 2687 } 2688 2689 return (0); 2690} 2691 2692static int 2693g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp, 2694 struct g_mirror_metadata *md) 2695{ 2696 2697 if (g_mirror_id2disk(sc, md->md_did) != NULL) { 2698 G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.", 2699 pp->name, md->md_did); 2700 return (EEXIST); 2701 } 2702 if (md->md_all != sc->sc_ndisks) { 2703 G_MIRROR_DEBUG(1, 2704 "Invalid '%s' field on disk %s (device %s), skipping.", 2705 "md_all", pp->name, sc->sc_name); 2706 return (EINVAL); 2707 } 2708 if (md->md_slice != sc->sc_slice) { 2709 G_MIRROR_DEBUG(1, 2710 "Invalid '%s' field on disk %s (device %s), skipping.", 2711 "md_slice", pp->name, sc->sc_name); 2712 return (EINVAL); 2713 } 2714 if (md->md_balance != sc->sc_balance) { 2715 G_MIRROR_DEBUG(1, 2716 "Invalid '%s' field on disk %s (device %s), skipping.", 2717 "md_balance", pp->name, sc->sc_name); 2718 return (EINVAL); 2719 } 2720 if (md->md_mediasize != sc->sc_mediasize) { 2721 G_MIRROR_DEBUG(1, 2722 "Invalid '%s' field on disk %s (device %s), skipping.", 2723 "md_mediasize", pp->name, sc->sc_name); 2724 return (EINVAL); 2725 } 2726 if (sc->sc_mediasize > pp->mediasize) { 2727 G_MIRROR_DEBUG(1, 2728 "Invalid size of disk %s (device %s), skipping.", pp->name, 2729 sc->sc_name); 2730 return (EINVAL); 2731 } 2732 if (md->md_sectorsize != sc->sc_sectorsize) { 2733 G_MIRROR_DEBUG(1, 2734 "Invalid '%s' field on disk %s (device %s), skipping.", 2735 "md_sectorsize", pp->name, sc->sc_name); 2736 return (EINVAL); 2737 } 2738 if ((sc->sc_sectorsize % pp->sectorsize) != 0) { 2739 G_MIRROR_DEBUG(1, 2740 "Invalid sector size of disk %s (device %s), skipping.", 2741 pp->name, sc->sc_name); 2742 return (EINVAL); 2743 } 2744 if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) { 2745 G_MIRROR_DEBUG(1, 2746 "Invalid device flags on disk %s (device %s), skipping.", 2747 pp->name, sc->sc_name); 2748 return (EINVAL); 2749 } 2750 if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) { 2751 G_MIRROR_DEBUG(1, 2752 "Invalid disk flags on disk %s (device %s), skipping.", 2753 pp->name, sc->sc_name); 2754 return (EINVAL); 2755 } 2756 return (0); 2757} 2758 2759int 2760g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp, 2761 struct g_mirror_metadata *md) 2762{ 2763 struct g_mirror_disk *disk; 2764 int error; 2765 2766 g_topology_assert_not(); 2767 G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name); 2768 2769 error = g_mirror_check_metadata(sc, pp, md); 2770 if (error != 0) 2771 return (error); 2772 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING && 2773 md->md_genid < sc->sc_genid) { 2774 G_MIRROR_DEBUG(0, "Component %s (device %s) broken, skipping.", 2775 pp->name, sc->sc_name); 2776 return (EINVAL); 2777 } 2778 disk = g_mirror_init_disk(sc, pp, md, &error); 2779 if (disk == NULL) 2780 return (error); 2781 error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW, 2782 G_MIRROR_EVENT_WAIT); 2783 if (error != 0) 2784 return (error); 2785 if (md->md_version < G_MIRROR_VERSION) { 2786 G_MIRROR_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).", 2787 pp->name, md->md_version, G_MIRROR_VERSION); 2788 g_mirror_update_metadata(disk); 2789 } 2790 return (0); 2791} 2792 2793static void 2794g_mirror_destroy_delayed(void *arg, int flag) 2795{ 2796 struct g_mirror_softc *sc; 2797 int error; 2798 2799 if (flag == EV_CANCEL) { 2800 G_MIRROR_DEBUG(1, "Destroying canceled."); 2801 return; 2802 } 2803 sc = arg; 2804 g_topology_unlock(); 2805 sx_xlock(&sc->sc_lock); 2806 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) == 0, 2807 ("DESTROY flag set on %s.", sc->sc_name)); 2808 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0, 2809 ("DESTROYING flag not set on %s.", sc->sc_name)); 2810 G_MIRROR_DEBUG(1, "Destroying %s (delayed).", sc->sc_name); 2811 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_SOFT); 2812 if (error != 0) { 2813 G_MIRROR_DEBUG(0, "Cannot destroy %s.", sc->sc_name); 2814 sx_xunlock(&sc->sc_lock); 2815 } 2816 g_topology_lock(); 2817} 2818 2819static int 2820g_mirror_access(struct g_provider *pp, int acr, int acw, int ace) 2821{ 2822 struct g_mirror_softc *sc; 2823 int dcr, dcw, dce, error = 0; 2824 2825 g_topology_assert(); 2826 G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr, 2827 acw, ace); 2828 2829 sc = pp->geom->softc; 2830 if (sc == NULL && acr <= 0 && acw <= 0 && ace <= 0) 2831 return (0); 2832 KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name)); 2833 2834 dcr = pp->acr + acr; 2835 dcw = pp->acw + acw; 2836 dce = pp->ace + ace; 2837 2838 g_topology_unlock(); 2839 sx_xlock(&sc->sc_lock); 2840 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0 || 2841 LIST_EMPTY(&sc->sc_disks)) { 2842 if (acr > 0 || acw > 0 || ace > 0) 2843 error = ENXIO; 2844 goto end; 2845 } 2846 if (dcw == 0) 2847 g_mirror_idle(sc, dcw); 2848 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0) { 2849 if (acr > 0 || acw > 0 || ace > 0) { 2850 error = ENXIO; 2851 goto end; 2852 } 2853 if (dcr == 0 && dcw == 0 && dce == 0) { 2854 g_post_event(g_mirror_destroy_delayed, sc, M_WAITOK, 2855 sc, NULL); 2856 } 2857 } 2858end: 2859 sx_xunlock(&sc->sc_lock); 2860 g_topology_lock(); 2861 return (error); 2862} 2863 2864static struct g_geom * 2865g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md) 2866{ 2867 struct g_mirror_softc *sc; 2868 struct g_geom *gp; 2869 int error, timeout; 2870 2871 g_topology_assert(); 2872 G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name, 2873 md->md_mid); 2874 2875 /* One disk is minimum. */ 2876 if (md->md_all < 1) 2877 return (NULL); 2878 /* 2879 * Action geom. 2880 */ 2881 gp = g_new_geomf(mp, "%s", md->md_name); 2882 sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO); 2883 gp->start = g_mirror_start; 2884 gp->orphan = g_mirror_orphan; 2885 gp->access = g_mirror_access; 2886 gp->dumpconf = g_mirror_dumpconf; 2887 2888 sc->sc_id = md->md_mid; 2889 sc->sc_slice = md->md_slice; 2890 sc->sc_balance = md->md_balance; 2891 sc->sc_mediasize = md->md_mediasize; 2892 sc->sc_sectorsize = md->md_sectorsize; 2893 sc->sc_ndisks = md->md_all; 2894 sc->sc_flags = md->md_mflags; 2895 sc->sc_bump_id = 0; 2896 sc->sc_idle = 1; 2897 sc->sc_last_write = time_uptime; 2898 sc->sc_writes = 0; 2899 sx_init(&sc->sc_lock, "gmirror:lock"); 2900 bioq_init(&sc->sc_queue); 2901 mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF); 2902 bioq_init(&sc->sc_regular_delayed); 2903 bioq_init(&sc->sc_inflight); 2904 bioq_init(&sc->sc_sync_delayed); 2905 LIST_INIT(&sc->sc_disks); 2906 TAILQ_INIT(&sc->sc_events); 2907 mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF); 2908 callout_init(&sc->sc_callout, CALLOUT_MPSAFE); 2909 mtx_init(&sc->sc_done_mtx, "gmirror:done", NULL, MTX_DEF); 2910 sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING; 2911 gp->softc = sc; 2912 sc->sc_geom = gp; 2913 sc->sc_provider = NULL; 2914 /* 2915 * Synchronization geom. 2916 */ 2917 gp = g_new_geomf(mp, "%s.sync", md->md_name); 2918 gp->softc = sc; 2919 gp->orphan = g_mirror_orphan; 2920 sc->sc_sync.ds_geom = gp; 2921 sc->sc_sync.ds_ndisks = 0; 2922 error = kproc_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0, 2923 "g_mirror %s", md->md_name); 2924 if (error != 0) { 2925 G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.", 2926 sc->sc_name); 2927 g_destroy_geom(sc->sc_sync.ds_geom); 2928 mtx_destroy(&sc->sc_done_mtx); 2929 mtx_destroy(&sc->sc_events_mtx); 2930 mtx_destroy(&sc->sc_queue_mtx); 2931 sx_destroy(&sc->sc_lock); 2932 g_destroy_geom(sc->sc_geom); 2933 free(sc, M_MIRROR); 2934 return (NULL); 2935 } 2936 2937 G_MIRROR_DEBUG(1, "Device %s created (%u components, id=%u).", 2938 sc->sc_name, sc->sc_ndisks, sc->sc_id); 2939 2940 sc->sc_rootmount = root_mount_hold("GMIRROR"); 2941 G_MIRROR_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount); 2942 /* 2943 * Run timeout. 2944 */ 2945 timeout = g_mirror_timeout * hz; 2946 callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc); 2947 return (sc->sc_geom); 2948} 2949 2950int 2951g_mirror_destroy(struct g_mirror_softc *sc, int how) 2952{ 2953 struct g_mirror_disk *disk; 2954 struct g_provider *pp; 2955 2956 g_topology_assert_not(); 2957 if (sc == NULL) 2958 return (ENXIO); 2959 sx_assert(&sc->sc_lock, SX_XLOCKED); 2960 2961 pp = sc->sc_provider; 2962 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 2963 switch (how) { 2964 case G_MIRROR_DESTROY_SOFT: 2965 G_MIRROR_DEBUG(1, 2966 "Device %s is still open (r%dw%de%d).", pp->name, 2967 pp->acr, pp->acw, pp->ace); 2968 return (EBUSY); 2969 case G_MIRROR_DESTROY_DELAYED: 2970 G_MIRROR_DEBUG(1, 2971 "Device %s will be destroyed on last close.", 2972 pp->name); 2973 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2974 if (disk->d_state == 2975 G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2976 g_mirror_sync_stop(disk, 1); 2977 } 2978 } 2979 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROYING; 2980 return (EBUSY); 2981 case G_MIRROR_DESTROY_HARD: 2982 G_MIRROR_DEBUG(1, "Device %s is still open, so it " 2983 "can't be definitely removed.", pp->name); 2984 } 2985 } 2986 2987 g_topology_lock(); 2988 if (sc->sc_geom->softc == NULL) { 2989 g_topology_unlock(); 2990 return (0); 2991 } 2992 sc->sc_geom->softc = NULL; 2993 sc->sc_sync.ds_geom->softc = NULL; 2994 g_topology_unlock(); 2995 2996 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2997 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_WAIT; 2998 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 2999 sx_xunlock(&sc->sc_lock); 3000 mtx_lock(&sc->sc_queue_mtx); 3001 wakeup(sc); 3002 mtx_unlock(&sc->sc_queue_mtx); 3003 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker); 3004 while (sc->sc_worker != NULL) 3005 tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5); 3006 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker); 3007 sx_xlock(&sc->sc_lock); 3008 g_mirror_destroy_device(sc); 3009 free(sc, M_MIRROR); 3010 return (0); 3011} 3012 3013static void 3014g_mirror_taste_orphan(struct g_consumer *cp) 3015{ 3016 3017 KASSERT(1 == 0, ("%s called while tasting %s.", __func__, 3018 cp->provider->name)); 3019} 3020 3021static struct g_geom * 3022g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 3023{ 3024 struct g_mirror_metadata md; 3025 struct g_mirror_softc *sc; 3026 struct g_consumer *cp; 3027 struct g_geom *gp; 3028 int error; 3029 3030 g_topology_assert(); 3031 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 3032 G_MIRROR_DEBUG(2, "Tasting %s.", pp->name); 3033 3034 gp = g_new_geomf(mp, "mirror:taste"); 3035 /* 3036 * This orphan function should be never called. 3037 */ 3038 gp->orphan = g_mirror_taste_orphan; 3039 cp = g_new_consumer(gp); 3040 g_attach(cp, pp); 3041 error = g_mirror_read_metadata(cp, &md); 3042 g_detach(cp); 3043 g_destroy_consumer(cp); 3044 g_destroy_geom(gp); 3045 if (error != 0) 3046 return (NULL); 3047 gp = NULL; 3048 3049 if (md.md_provider[0] != '\0' && 3050 !g_compare_names(md.md_provider, pp->name)) 3051 return (NULL); 3052 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize) 3053 return (NULL); 3054 if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) { 3055 G_MIRROR_DEBUG(0, 3056 "Device %s: provider %s marked as inactive, skipping.", 3057 md.md_name, pp->name); 3058 return (NULL); 3059 } 3060 if (g_mirror_debug >= 2) 3061 mirror_metadata_dump(&md); 3062 3063 /* 3064 * Let's check if device already exists. 3065 */ 3066 sc = NULL; 3067 LIST_FOREACH(gp, &mp->geom, geom) { 3068 sc = gp->softc; 3069 if (sc == NULL) 3070 continue; 3071 if (sc->sc_sync.ds_geom == gp) 3072 continue; 3073 if (strcmp(md.md_name, sc->sc_name) != 0) 3074 continue; 3075 if (md.md_mid != sc->sc_id) { 3076 G_MIRROR_DEBUG(0, "Device %s already configured.", 3077 sc->sc_name); 3078 return (NULL); 3079 } 3080 break; 3081 } 3082 if (gp == NULL) { 3083 gp = g_mirror_create(mp, &md); 3084 if (gp == NULL) { 3085 G_MIRROR_DEBUG(0, "Cannot create device %s.", 3086 md.md_name); 3087 return (NULL); 3088 } 3089 sc = gp->softc; 3090 } 3091 G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name); 3092 g_topology_unlock(); 3093 sx_xlock(&sc->sc_lock); 3094 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_TASTING; 3095 error = g_mirror_add_disk(sc, pp, &md); 3096 if (error != 0) { 3097 G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).", 3098 pp->name, gp->name, error); 3099 if (LIST_EMPTY(&sc->sc_disks)) { 3100 g_cancel_event(sc); 3101 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3102 g_topology_lock(); 3103 return (NULL); 3104 } 3105 gp = NULL; 3106 } 3107 sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_TASTING; 3108 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 3109 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3110 g_topology_lock(); 3111 return (NULL); 3112 } 3113 sx_xunlock(&sc->sc_lock); 3114 g_topology_lock(); 3115 return (gp); 3116} 3117 3118static int 3119g_mirror_destroy_geom(struct gctl_req *req __unused, 3120 struct g_class *mp __unused, struct g_geom *gp) 3121{ 3122 struct g_mirror_softc *sc; 3123 int error; 3124 3125 g_topology_unlock(); 3126 sc = gp->softc; 3127 sx_xlock(&sc->sc_lock); 3128 g_cancel_event(sc); 3129 error = g_mirror_destroy(gp->softc, G_MIRROR_DESTROY_SOFT); 3130 if (error != 0) 3131 sx_xunlock(&sc->sc_lock); 3132 g_topology_lock(); 3133 return (error); 3134} 3135 3136static void 3137g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 3138 struct g_consumer *cp, struct g_provider *pp) 3139{ 3140 struct g_mirror_softc *sc; 3141 3142 g_topology_assert(); 3143 3144 sc = gp->softc; 3145 if (sc == NULL) 3146 return; 3147 /* Skip synchronization geom. */ 3148 if (gp == sc->sc_sync.ds_geom) 3149 return; 3150 if (pp != NULL) { 3151 /* Nothing here. */ 3152 } else if (cp != NULL) { 3153 struct g_mirror_disk *disk; 3154 3155 disk = cp->private; 3156 if (disk == NULL) 3157 return; 3158 g_topology_unlock(); 3159 sx_xlock(&sc->sc_lock); 3160 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id); 3161 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3162 sbuf_printf(sb, "%s<Synchronized>", indent); 3163 if (disk->d_sync.ds_offset == 0) 3164 sbuf_printf(sb, "0%%"); 3165 else { 3166 sbuf_printf(sb, "%u%%", 3167 (u_int)((disk->d_sync.ds_offset * 100) / 3168 sc->sc_provider->mediasize)); 3169 } 3170 sbuf_printf(sb, "</Synchronized>\n"); 3171 if (disk->d_sync.ds_offset > 0) { 3172 sbuf_printf(sb, "%s<BytesSynced>%jd" 3173 "</BytesSynced>\n", indent, 3174 (intmax_t)disk->d_sync.ds_offset); 3175 } 3176 } 3177 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, 3178 disk->d_sync.ds_syncid); 3179 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, 3180 disk->d_genid); 3181 sbuf_printf(sb, "%s<Flags>", indent); 3182 if (disk->d_flags == 0) 3183 sbuf_printf(sb, "NONE"); 3184 else { 3185 int first = 1; 3186 3187#define ADD_FLAG(flag, name) do { \ 3188 if ((disk->d_flags & (flag)) != 0) { \ 3189 if (!first) \ 3190 sbuf_printf(sb, ", "); \ 3191 else \ 3192 first = 0; \ 3193 sbuf_printf(sb, name); \ 3194 } \ 3195} while (0) 3196 ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY"); 3197 ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED"); 3198 ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE"); 3199 ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING, 3200 "SYNCHRONIZING"); 3201 ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC"); 3202 ADD_FLAG(G_MIRROR_DISK_FLAG_BROKEN, "BROKEN"); 3203#undef ADD_FLAG 3204 } 3205 sbuf_printf(sb, "</Flags>\n"); 3206 sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent, 3207 disk->d_priority); 3208 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 3209 g_mirror_disk_state2str(disk->d_state)); 3210 sx_xunlock(&sc->sc_lock); 3211 g_topology_lock(); 3212 } else { 3213 g_topology_unlock(); 3214 sx_xlock(&sc->sc_lock); 3215 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id); 3216 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid); 3217 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid); 3218 sbuf_printf(sb, "%s<Flags>", indent); 3219 if (sc->sc_flags == 0) 3220 sbuf_printf(sb, "NONE"); 3221 else { 3222 int first = 1; 3223 3224#define ADD_FLAG(flag, name) do { \ 3225 if ((sc->sc_flags & (flag)) != 0) { \ 3226 if (!first) \ 3227 sbuf_printf(sb, ", "); \ 3228 else \ 3229 first = 0; \ 3230 sbuf_printf(sb, name); \ 3231 } \ 3232} while (0) 3233 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC"); 3234 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC"); 3235#undef ADD_FLAG 3236 } 3237 sbuf_printf(sb, "</Flags>\n"); 3238 sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent, 3239 (u_int)sc->sc_slice); 3240 sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent, 3241 balance_name(sc->sc_balance)); 3242 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent, 3243 sc->sc_ndisks); 3244 sbuf_printf(sb, "%s<State>", indent); 3245 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 3246 sbuf_printf(sb, "%s", "STARTING"); 3247 else if (sc->sc_ndisks == 3248 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE)) 3249 sbuf_printf(sb, "%s", "COMPLETE"); 3250 else 3251 sbuf_printf(sb, "%s", "DEGRADED"); 3252 sbuf_printf(sb, "</State>\n"); 3253 sx_xunlock(&sc->sc_lock); 3254 g_topology_lock(); 3255 } 3256} 3257 3258static void 3259g_mirror_shutdown_post_sync(void *arg, int howto) 3260{ 3261 struct g_class *mp; 3262 struct g_geom *gp, *gp2; 3263 struct g_mirror_softc *sc; 3264 int error; 3265 3266 mp = arg; 3267 DROP_GIANT(); 3268 g_topology_lock(); 3269 g_mirror_shutdown = 1; 3270 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 3271 if ((sc = gp->softc) == NULL) 3272 continue; 3273 /* Skip synchronization geom. */ 3274 if (gp == sc->sc_sync.ds_geom) 3275 continue; 3276 g_topology_unlock(); 3277 sx_xlock(&sc->sc_lock); 3278 g_mirror_idle(sc, -1); 3279 g_cancel_event(sc); 3280 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_DELAYED); 3281 if (error != 0) 3282 sx_xunlock(&sc->sc_lock); 3283 g_topology_lock(); 3284 } 3285 g_topology_unlock(); 3286 PICKUP_GIANT(); 3287} 3288 3289static void 3290g_mirror_init(struct g_class *mp) 3291{ 3292 3293 g_mirror_post_sync = EVENTHANDLER_REGISTER(shutdown_post_sync, 3294 g_mirror_shutdown_post_sync, mp, SHUTDOWN_PRI_FIRST); 3295 if (g_mirror_post_sync == NULL) 3296 G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event."); 3297} 3298 3299static void 3300g_mirror_fini(struct g_class *mp) 3301{ 3302 3303 if (g_mirror_post_sync != NULL) 3304 EVENTHANDLER_DEREGISTER(shutdown_post_sync, g_mirror_post_sync); 3305} 3306 3307DECLARE_GEOM_CLASS(g_mirror_class, g_mirror); 3308