g_mirror.c revision 302408
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/11/sys/geom/mirror/g_mirror.c 302091 2016-06-22 21:00:28Z markj $"); 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; 57SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RWTUN, &g_mirror_debug, 0, 58 "Debug level"); 59static u_int g_mirror_timeout = 4; 60SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RWTUN, &g_mirror_timeout, 61 0, "Time to wait on all mirror components"); 62static u_int g_mirror_idletime = 5; 63SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, idletime, CTLFLAG_RWTUN, 64 &g_mirror_idletime, 0, "Mark components as clean when idling"); 65static u_int g_mirror_disconnect_on_failure = 1; 66SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, disconnect_on_failure, CTLFLAG_RWTUN, 67 &g_mirror_disconnect_on_failure, 0, "Disconnect component on I/O failure."); 68static u_int g_mirror_syncreqs = 2; 69SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_requests, CTLFLAG_RDTUN, 70 &g_mirror_syncreqs, 0, "Parallel synchronization I/O requests."); 71 72#define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \ 73 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \ 74 msleep((ident), (mtx), (priority), (wmesg), (timeout)); \ 75 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \ 76} while (0) 77 78static eventhandler_tag g_mirror_post_sync = NULL; 79static int g_mirror_shutdown = 0; 80 81static int g_mirror_destroy_geom(struct gctl_req *req, struct g_class *mp, 82 struct g_geom *gp); 83static g_taste_t g_mirror_taste; 84static g_resize_t g_mirror_resize; 85static void g_mirror_init(struct g_class *mp); 86static void g_mirror_fini(struct g_class *mp); 87 88struct g_class g_mirror_class = { 89 .name = G_MIRROR_CLASS_NAME, 90 .version = G_VERSION, 91 .ctlreq = g_mirror_config, 92 .taste = g_mirror_taste, 93 .destroy_geom = g_mirror_destroy_geom, 94 .init = g_mirror_init, 95 .fini = g_mirror_fini, 96 .resize = g_mirror_resize 97}; 98 99 100static void g_mirror_destroy_provider(struct g_mirror_softc *sc); 101static int g_mirror_update_disk(struct g_mirror_disk *disk, u_int state); 102static void g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force); 103static void g_mirror_dumpconf(struct sbuf *sb, const char *indent, 104 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp); 105static void g_mirror_sync_stop(struct g_mirror_disk *disk, int type); 106static void g_mirror_register_request(struct bio *bp); 107static void g_mirror_sync_release(struct g_mirror_softc *sc); 108 109 110static const char * 111g_mirror_disk_state2str(int state) 112{ 113 114 switch (state) { 115 case G_MIRROR_DISK_STATE_NONE: 116 return ("NONE"); 117 case G_MIRROR_DISK_STATE_NEW: 118 return ("NEW"); 119 case G_MIRROR_DISK_STATE_ACTIVE: 120 return ("ACTIVE"); 121 case G_MIRROR_DISK_STATE_STALE: 122 return ("STALE"); 123 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 124 return ("SYNCHRONIZING"); 125 case G_MIRROR_DISK_STATE_DISCONNECTED: 126 return ("DISCONNECTED"); 127 case G_MIRROR_DISK_STATE_DESTROY: 128 return ("DESTROY"); 129 default: 130 return ("INVALID"); 131 } 132} 133 134static const char * 135g_mirror_device_state2str(int state) 136{ 137 138 switch (state) { 139 case G_MIRROR_DEVICE_STATE_STARTING: 140 return ("STARTING"); 141 case G_MIRROR_DEVICE_STATE_RUNNING: 142 return ("RUNNING"); 143 default: 144 return ("INVALID"); 145 } 146} 147 148static const char * 149g_mirror_get_diskname(struct g_mirror_disk *disk) 150{ 151 152 if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL) 153 return ("[unknown]"); 154 return (disk->d_name); 155} 156 157/* 158 * --- Events handling functions --- 159 * Events in geom_mirror are used to maintain disks and device status 160 * from one thread to simplify locking. 161 */ 162static void 163g_mirror_event_free(struct g_mirror_event *ep) 164{ 165 166 free(ep, M_MIRROR); 167} 168 169int 170g_mirror_event_send(void *arg, int state, int flags) 171{ 172 struct g_mirror_softc *sc; 173 struct g_mirror_disk *disk; 174 struct g_mirror_event *ep; 175 int error; 176 177 ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK); 178 G_MIRROR_DEBUG(4, "%s: Sending event %p.", __func__, ep); 179 if ((flags & G_MIRROR_EVENT_DEVICE) != 0) { 180 disk = NULL; 181 sc = arg; 182 } else { 183 disk = arg; 184 sc = disk->d_softc; 185 } 186 ep->e_disk = disk; 187 ep->e_state = state; 188 ep->e_flags = flags; 189 ep->e_error = 0; 190 mtx_lock(&sc->sc_events_mtx); 191 TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next); 192 mtx_unlock(&sc->sc_events_mtx); 193 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 194 mtx_lock(&sc->sc_queue_mtx); 195 wakeup(sc); 196 mtx_unlock(&sc->sc_queue_mtx); 197 if ((flags & G_MIRROR_EVENT_DONTWAIT) != 0) 198 return (0); 199 sx_assert(&sc->sc_lock, SX_XLOCKED); 200 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep); 201 sx_xunlock(&sc->sc_lock); 202 while ((ep->e_flags & G_MIRROR_EVENT_DONE) == 0) { 203 mtx_lock(&sc->sc_events_mtx); 204 MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "m:event", 205 hz * 5); 206 } 207 error = ep->e_error; 208 g_mirror_event_free(ep); 209 sx_xlock(&sc->sc_lock); 210 return (error); 211} 212 213static struct g_mirror_event * 214g_mirror_event_get(struct g_mirror_softc *sc) 215{ 216 struct g_mirror_event *ep; 217 218 mtx_lock(&sc->sc_events_mtx); 219 ep = TAILQ_FIRST(&sc->sc_events); 220 mtx_unlock(&sc->sc_events_mtx); 221 return (ep); 222} 223 224static void 225g_mirror_event_remove(struct g_mirror_softc *sc, struct g_mirror_event *ep) 226{ 227 228 mtx_lock(&sc->sc_events_mtx); 229 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 230 mtx_unlock(&sc->sc_events_mtx); 231} 232 233static void 234g_mirror_event_cancel(struct g_mirror_disk *disk) 235{ 236 struct g_mirror_softc *sc; 237 struct g_mirror_event *ep, *tmpep; 238 239 sc = disk->d_softc; 240 sx_assert(&sc->sc_lock, SX_XLOCKED); 241 242 mtx_lock(&sc->sc_events_mtx); 243 TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) { 244 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) 245 continue; 246 if (ep->e_disk != disk) 247 continue; 248 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 249 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 250 g_mirror_event_free(ep); 251 else { 252 ep->e_error = ECANCELED; 253 wakeup(ep); 254 } 255 } 256 mtx_unlock(&sc->sc_events_mtx); 257} 258 259/* 260 * Return the number of disks in given state. 261 * If state is equal to -1, count all connected disks. 262 */ 263u_int 264g_mirror_ndisks(struct g_mirror_softc *sc, int state) 265{ 266 struct g_mirror_disk *disk; 267 u_int n = 0; 268 269 sx_assert(&sc->sc_lock, SX_LOCKED); 270 271 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 272 if (state == -1 || disk->d_state == state) 273 n++; 274 } 275 return (n); 276} 277 278/* 279 * Find a disk in mirror by its disk ID. 280 */ 281static struct g_mirror_disk * 282g_mirror_id2disk(struct g_mirror_softc *sc, uint32_t id) 283{ 284 struct g_mirror_disk *disk; 285 286 sx_assert(&sc->sc_lock, SX_XLOCKED); 287 288 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 289 if (disk->d_id == id) 290 return (disk); 291 } 292 return (NULL); 293} 294 295static u_int 296g_mirror_nrequests(struct g_mirror_softc *sc, struct g_consumer *cp) 297{ 298 struct bio *bp; 299 u_int nreqs = 0; 300 301 mtx_lock(&sc->sc_queue_mtx); 302 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) { 303 if (bp->bio_from == cp) 304 nreqs++; 305 } 306 mtx_unlock(&sc->sc_queue_mtx); 307 return (nreqs); 308} 309 310static int 311g_mirror_is_busy(struct g_mirror_softc *sc, struct g_consumer *cp) 312{ 313 314 if (cp->index > 0) { 315 G_MIRROR_DEBUG(2, 316 "I/O requests for %s exist, can't destroy it now.", 317 cp->provider->name); 318 return (1); 319 } 320 if (g_mirror_nrequests(sc, cp) > 0) { 321 G_MIRROR_DEBUG(2, 322 "I/O requests for %s in queue, can't destroy it now.", 323 cp->provider->name); 324 return (1); 325 } 326 return (0); 327} 328 329static void 330g_mirror_destroy_consumer(void *arg, int flags __unused) 331{ 332 struct g_consumer *cp; 333 334 g_topology_assert(); 335 336 cp = arg; 337 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", cp->provider->name); 338 g_detach(cp); 339 g_destroy_consumer(cp); 340} 341 342static void 343g_mirror_kill_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 344{ 345 struct g_provider *pp; 346 int retaste_wait; 347 348 g_topology_assert(); 349 350 cp->private = NULL; 351 if (g_mirror_is_busy(sc, cp)) 352 return; 353 pp = cp->provider; 354 retaste_wait = 0; 355 if (cp->acw == 1) { 356 if ((pp->geom->flags & G_GEOM_WITHER) == 0) 357 retaste_wait = 1; 358 } 359 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", pp->name, -cp->acr, 360 -cp->acw, -cp->ace, 0); 361 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 362 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 363 if (retaste_wait) { 364 /* 365 * After retaste event was send (inside g_access()), we can send 366 * event to detach and destroy consumer. 367 * A class, which has consumer to the given provider connected 368 * will not receive retaste event for the provider. 369 * This is the way how I ignore retaste events when I close 370 * consumers opened for write: I detach and destroy consumer 371 * after retaste event is sent. 372 */ 373 g_post_event(g_mirror_destroy_consumer, cp, M_WAITOK, NULL); 374 return; 375 } 376 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", pp->name); 377 g_detach(cp); 378 g_destroy_consumer(cp); 379} 380 381static int 382g_mirror_connect_disk(struct g_mirror_disk *disk, struct g_provider *pp) 383{ 384 struct g_consumer *cp; 385 int error; 386 387 g_topology_assert_not(); 388 KASSERT(disk->d_consumer == NULL, 389 ("Disk already connected (device %s).", disk->d_softc->sc_name)); 390 391 g_topology_lock(); 392 cp = g_new_consumer(disk->d_softc->sc_geom); 393 cp->flags |= G_CF_DIRECT_RECEIVE; 394 error = g_attach(cp, pp); 395 if (error != 0) { 396 g_destroy_consumer(cp); 397 g_topology_unlock(); 398 return (error); 399 } 400 error = g_access(cp, 1, 1, 1); 401 if (error != 0) { 402 g_detach(cp); 403 g_destroy_consumer(cp); 404 g_topology_unlock(); 405 G_MIRROR_DEBUG(0, "Cannot open consumer %s (error=%d).", 406 pp->name, error); 407 return (error); 408 } 409 g_topology_unlock(); 410 disk->d_consumer = cp; 411 disk->d_consumer->private = disk; 412 disk->d_consumer->index = 0; 413 414 G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk)); 415 return (0); 416} 417 418static void 419g_mirror_disconnect_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 420{ 421 422 g_topology_assert(); 423 424 if (cp == NULL) 425 return; 426 if (cp->provider != NULL) 427 g_mirror_kill_consumer(sc, cp); 428 else 429 g_destroy_consumer(cp); 430} 431 432/* 433 * Initialize disk. This means allocate memory, create consumer, attach it 434 * to the provider and open access (r1w1e1) to it. 435 */ 436static struct g_mirror_disk * 437g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp, 438 struct g_mirror_metadata *md, int *errorp) 439{ 440 struct g_mirror_disk *disk; 441 int i, error; 442 443 disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO); 444 if (disk == NULL) { 445 error = ENOMEM; 446 goto fail; 447 } 448 disk->d_softc = sc; 449 error = g_mirror_connect_disk(disk, pp); 450 if (error != 0) 451 goto fail; 452 disk->d_id = md->md_did; 453 disk->d_state = G_MIRROR_DISK_STATE_NONE; 454 disk->d_priority = md->md_priority; 455 disk->d_flags = md->md_dflags; 456 error = g_getattr("GEOM::candelete", disk->d_consumer, &i); 457 if (error == 0 && i != 0) 458 disk->d_flags |= G_MIRROR_DISK_FLAG_CANDELETE; 459 if (md->md_provider[0] != '\0') 460 disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED; 461 disk->d_sync.ds_consumer = NULL; 462 disk->d_sync.ds_offset = md->md_sync_offset; 463 disk->d_sync.ds_offset_done = md->md_sync_offset; 464 disk->d_genid = md->md_genid; 465 disk->d_sync.ds_syncid = md->md_syncid; 466 if (errorp != NULL) 467 *errorp = 0; 468 return (disk); 469fail: 470 if (errorp != NULL) 471 *errorp = error; 472 if (disk != NULL) 473 free(disk, M_MIRROR); 474 return (NULL); 475} 476 477static void 478g_mirror_destroy_disk(struct g_mirror_disk *disk) 479{ 480 struct g_mirror_softc *sc; 481 482 g_topology_assert_not(); 483 sc = disk->d_softc; 484 sx_assert(&sc->sc_lock, SX_XLOCKED); 485 486 LIST_REMOVE(disk, d_next); 487 g_mirror_event_cancel(disk); 488 if (sc->sc_hint == disk) 489 sc->sc_hint = NULL; 490 switch (disk->d_state) { 491 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 492 g_mirror_sync_stop(disk, 1); 493 /* FALLTHROUGH */ 494 case G_MIRROR_DISK_STATE_NEW: 495 case G_MIRROR_DISK_STATE_STALE: 496 case G_MIRROR_DISK_STATE_ACTIVE: 497 g_topology_lock(); 498 g_mirror_disconnect_consumer(sc, disk->d_consumer); 499 g_topology_unlock(); 500 free(disk, M_MIRROR); 501 break; 502 default: 503 KASSERT(0 == 1, ("Wrong disk state (%s, %s).", 504 g_mirror_get_diskname(disk), 505 g_mirror_disk_state2str(disk->d_state))); 506 } 507} 508 509static void 510g_mirror_destroy_device(struct g_mirror_softc *sc) 511{ 512 struct g_mirror_disk *disk; 513 struct g_mirror_event *ep; 514 struct g_geom *gp; 515 struct g_consumer *cp, *tmpcp; 516 517 g_topology_assert_not(); 518 sx_assert(&sc->sc_lock, SX_XLOCKED); 519 520 gp = sc->sc_geom; 521 if (sc->sc_provider != NULL) 522 g_mirror_destroy_provider(sc); 523 for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL; 524 disk = LIST_FIRST(&sc->sc_disks)) { 525 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 526 g_mirror_update_metadata(disk); 527 g_mirror_destroy_disk(disk); 528 } 529 while ((ep = g_mirror_event_get(sc)) != NULL) { 530 g_mirror_event_remove(sc, ep); 531 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 532 g_mirror_event_free(ep); 533 else { 534 ep->e_error = ECANCELED; 535 ep->e_flags |= G_MIRROR_EVENT_DONE; 536 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep); 537 mtx_lock(&sc->sc_events_mtx); 538 wakeup(ep); 539 mtx_unlock(&sc->sc_events_mtx); 540 } 541 } 542 callout_drain(&sc->sc_callout); 543 544 g_topology_lock(); 545 LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) { 546 g_mirror_disconnect_consumer(sc, cp); 547 } 548 g_wither_geom(sc->sc_sync.ds_geom, ENXIO); 549 G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name); 550 g_wither_geom(gp, ENXIO); 551 g_topology_unlock(); 552 mtx_destroy(&sc->sc_queue_mtx); 553 mtx_destroy(&sc->sc_events_mtx); 554 mtx_destroy(&sc->sc_done_mtx); 555 sx_xunlock(&sc->sc_lock); 556 sx_destroy(&sc->sc_lock); 557} 558 559static void 560g_mirror_orphan(struct g_consumer *cp) 561{ 562 struct g_mirror_disk *disk; 563 564 g_topology_assert(); 565 566 disk = cp->private; 567 if (disk == NULL) 568 return; 569 disk->d_softc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 570 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 571 G_MIRROR_EVENT_DONTWAIT); 572} 573 574/* 575 * Function should return the next active disk on the list. 576 * It is possible that it will be the same disk as given. 577 * If there are no active disks on list, NULL is returned. 578 */ 579static __inline struct g_mirror_disk * 580g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 581{ 582 struct g_mirror_disk *dp; 583 584 for (dp = LIST_NEXT(disk, d_next); dp != disk; 585 dp = LIST_NEXT(dp, d_next)) { 586 if (dp == NULL) 587 dp = LIST_FIRST(&sc->sc_disks); 588 if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE) 589 break; 590 } 591 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 592 return (NULL); 593 return (dp); 594} 595 596static struct g_mirror_disk * 597g_mirror_get_disk(struct g_mirror_softc *sc) 598{ 599 struct g_mirror_disk *disk; 600 601 if (sc->sc_hint == NULL) { 602 sc->sc_hint = LIST_FIRST(&sc->sc_disks); 603 if (sc->sc_hint == NULL) 604 return (NULL); 605 } 606 disk = sc->sc_hint; 607 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) { 608 disk = g_mirror_find_next(sc, disk); 609 if (disk == NULL) 610 return (NULL); 611 } 612 sc->sc_hint = g_mirror_find_next(sc, disk); 613 return (disk); 614} 615 616static int 617g_mirror_write_metadata(struct g_mirror_disk *disk, 618 struct g_mirror_metadata *md) 619{ 620 struct g_mirror_softc *sc; 621 struct g_consumer *cp; 622 off_t offset, length; 623 u_char *sector; 624 int error = 0; 625 626 g_topology_assert_not(); 627 sc = disk->d_softc; 628 sx_assert(&sc->sc_lock, SX_LOCKED); 629 630 cp = disk->d_consumer; 631 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name)); 632 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name)); 633 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 634 ("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr, 635 cp->acw, cp->ace)); 636 length = cp->provider->sectorsize; 637 offset = cp->provider->mediasize - length; 638 sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO); 639 if (md != NULL && 640 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) { 641 /* 642 * Handle the case, when the size of parent provider reduced. 643 */ 644 if (offset < md->md_mediasize) 645 error = ENOSPC; 646 else 647 mirror_metadata_encode(md, sector); 648 } 649 if (error == 0) 650 error = g_write_data(cp, offset, sector, length); 651 free(sector, M_MIRROR); 652 if (error != 0) { 653 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 654 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 655 G_MIRROR_DEBUG(0, "Cannot write metadata on %s " 656 "(device=%s, error=%d).", 657 g_mirror_get_diskname(disk), sc->sc_name, error); 658 } else { 659 G_MIRROR_DEBUG(1, "Cannot write metadata on %s " 660 "(device=%s, error=%d).", 661 g_mirror_get_diskname(disk), sc->sc_name, error); 662 } 663 if (g_mirror_disconnect_on_failure && 664 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) { 665 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 666 g_mirror_event_send(disk, 667 G_MIRROR_DISK_STATE_DISCONNECTED, 668 G_MIRROR_EVENT_DONTWAIT); 669 } 670 } 671 return (error); 672} 673 674static int 675g_mirror_clear_metadata(struct g_mirror_disk *disk) 676{ 677 int error; 678 679 g_topology_assert_not(); 680 sx_assert(&disk->d_softc->sc_lock, SX_LOCKED); 681 682 error = g_mirror_write_metadata(disk, NULL); 683 if (error == 0) { 684 G_MIRROR_DEBUG(2, "Metadata on %s cleared.", 685 g_mirror_get_diskname(disk)); 686 } else { 687 G_MIRROR_DEBUG(0, 688 "Cannot clear metadata on disk %s (error=%d).", 689 g_mirror_get_diskname(disk), error); 690 } 691 return (error); 692} 693 694void 695g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk, 696 struct g_mirror_metadata *md) 697{ 698 699 strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic)); 700 md->md_version = G_MIRROR_VERSION; 701 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name)); 702 md->md_mid = sc->sc_id; 703 md->md_all = sc->sc_ndisks; 704 md->md_slice = sc->sc_slice; 705 md->md_balance = sc->sc_balance; 706 md->md_genid = sc->sc_genid; 707 md->md_mediasize = sc->sc_mediasize; 708 md->md_sectorsize = sc->sc_sectorsize; 709 md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK); 710 bzero(md->md_provider, sizeof(md->md_provider)); 711 if (disk == NULL) { 712 md->md_did = arc4random(); 713 md->md_priority = 0; 714 md->md_syncid = 0; 715 md->md_dflags = 0; 716 md->md_sync_offset = 0; 717 md->md_provsize = 0; 718 } else { 719 md->md_did = disk->d_id; 720 md->md_priority = disk->d_priority; 721 md->md_syncid = disk->d_sync.ds_syncid; 722 md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK); 723 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 724 md->md_sync_offset = disk->d_sync.ds_offset_done; 725 else 726 md->md_sync_offset = 0; 727 if ((disk->d_flags & G_MIRROR_DISK_FLAG_HARDCODED) != 0) { 728 strlcpy(md->md_provider, 729 disk->d_consumer->provider->name, 730 sizeof(md->md_provider)); 731 } 732 md->md_provsize = disk->d_consumer->provider->mediasize; 733 } 734} 735 736void 737g_mirror_update_metadata(struct g_mirror_disk *disk) 738{ 739 struct g_mirror_softc *sc; 740 struct g_mirror_metadata md; 741 int error; 742 743 g_topology_assert_not(); 744 sc = disk->d_softc; 745 sx_assert(&sc->sc_lock, SX_LOCKED); 746 747 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) 748 g_mirror_fill_metadata(sc, disk, &md); 749 error = g_mirror_write_metadata(disk, &md); 750 if (error == 0) { 751 G_MIRROR_DEBUG(2, "Metadata on %s updated.", 752 g_mirror_get_diskname(disk)); 753 } else { 754 G_MIRROR_DEBUG(0, 755 "Cannot update metadata on disk %s (error=%d).", 756 g_mirror_get_diskname(disk), error); 757 } 758} 759 760static void 761g_mirror_bump_syncid(struct g_mirror_softc *sc) 762{ 763 struct g_mirror_disk *disk; 764 765 g_topology_assert_not(); 766 sx_assert(&sc->sc_lock, SX_XLOCKED); 767 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 768 ("%s called with no active disks (device=%s).", __func__, 769 sc->sc_name)); 770 771 sc->sc_syncid++; 772 G_MIRROR_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name, 773 sc->sc_syncid); 774 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 775 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 776 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 777 disk->d_sync.ds_syncid = sc->sc_syncid; 778 g_mirror_update_metadata(disk); 779 } 780 } 781} 782 783static void 784g_mirror_bump_genid(struct g_mirror_softc *sc) 785{ 786 struct g_mirror_disk *disk; 787 788 g_topology_assert_not(); 789 sx_assert(&sc->sc_lock, SX_XLOCKED); 790 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 791 ("%s called with no active disks (device=%s).", __func__, 792 sc->sc_name)); 793 794 sc->sc_genid++; 795 G_MIRROR_DEBUG(1, "Device %s: genid bumped to %u.", sc->sc_name, 796 sc->sc_genid); 797 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 798 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 799 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 800 disk->d_genid = sc->sc_genid; 801 g_mirror_update_metadata(disk); 802 } 803 } 804} 805 806static int 807g_mirror_idle(struct g_mirror_softc *sc, int acw) 808{ 809 struct g_mirror_disk *disk; 810 int timeout; 811 812 g_topology_assert_not(); 813 sx_assert(&sc->sc_lock, SX_XLOCKED); 814 815 if (sc->sc_provider == NULL) 816 return (0); 817 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 818 return (0); 819 if (sc->sc_idle) 820 return (0); 821 if (sc->sc_writes > 0) 822 return (0); 823 if (acw > 0 || (acw == -1 && sc->sc_provider->acw > 0)) { 824 timeout = g_mirror_idletime - (time_uptime - sc->sc_last_write); 825 if (!g_mirror_shutdown && timeout > 0) 826 return (timeout); 827 } 828 sc->sc_idle = 1; 829 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 830 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 831 continue; 832 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.", 833 g_mirror_get_diskname(disk), sc->sc_name); 834 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 835 g_mirror_update_metadata(disk); 836 } 837 return (0); 838} 839 840static void 841g_mirror_unidle(struct g_mirror_softc *sc) 842{ 843 struct g_mirror_disk *disk; 844 845 g_topology_assert_not(); 846 sx_assert(&sc->sc_lock, SX_XLOCKED); 847 848 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 849 return; 850 sc->sc_idle = 0; 851 sc->sc_last_write = time_uptime; 852 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 853 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 854 continue; 855 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.", 856 g_mirror_get_diskname(disk), sc->sc_name); 857 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 858 g_mirror_update_metadata(disk); 859 } 860} 861 862static void 863g_mirror_flush_done(struct bio *bp) 864{ 865 struct g_mirror_softc *sc; 866 struct bio *pbp; 867 868 pbp = bp->bio_parent; 869 sc = pbp->bio_to->geom->softc; 870 mtx_lock(&sc->sc_done_mtx); 871 if (pbp->bio_error == 0) 872 pbp->bio_error = bp->bio_error; 873 pbp->bio_completed += bp->bio_completed; 874 pbp->bio_inbed++; 875 if (pbp->bio_children == pbp->bio_inbed) { 876 mtx_unlock(&sc->sc_done_mtx); 877 g_io_deliver(pbp, pbp->bio_error); 878 } else 879 mtx_unlock(&sc->sc_done_mtx); 880 g_destroy_bio(bp); 881} 882 883static void 884g_mirror_done(struct bio *bp) 885{ 886 struct g_mirror_softc *sc; 887 888 sc = bp->bio_from->geom->softc; 889 bp->bio_cflags = G_MIRROR_BIO_FLAG_REGULAR; 890 mtx_lock(&sc->sc_queue_mtx); 891 bioq_insert_tail(&sc->sc_queue, bp); 892 mtx_unlock(&sc->sc_queue_mtx); 893 wakeup(sc); 894} 895 896static void 897g_mirror_regular_request(struct bio *bp) 898{ 899 struct g_mirror_softc *sc; 900 struct g_mirror_disk *disk; 901 struct bio *pbp; 902 903 g_topology_assert_not(); 904 905 pbp = bp->bio_parent; 906 sc = pbp->bio_to->geom->softc; 907 bp->bio_from->index--; 908 if (bp->bio_cmd == BIO_WRITE) 909 sc->sc_writes--; 910 disk = bp->bio_from->private; 911 if (disk == NULL) { 912 g_topology_lock(); 913 g_mirror_kill_consumer(sc, bp->bio_from); 914 g_topology_unlock(); 915 } 916 917 pbp->bio_inbed++; 918 KASSERT(pbp->bio_inbed <= pbp->bio_children, 919 ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed, 920 pbp->bio_children)); 921 if (bp->bio_error == 0 && pbp->bio_error == 0) { 922 G_MIRROR_LOGREQ(3, bp, "Request delivered."); 923 g_destroy_bio(bp); 924 if (pbp->bio_children == pbp->bio_inbed) { 925 G_MIRROR_LOGREQ(3, pbp, "Request delivered."); 926 pbp->bio_completed = pbp->bio_length; 927 if (pbp->bio_cmd == BIO_WRITE || 928 pbp->bio_cmd == BIO_DELETE) { 929 bioq_remove(&sc->sc_inflight, pbp); 930 /* Release delayed sync requests if possible. */ 931 g_mirror_sync_release(sc); 932 } 933 g_io_deliver(pbp, pbp->bio_error); 934 } 935 return; 936 } else if (bp->bio_error != 0) { 937 if (pbp->bio_error == 0) 938 pbp->bio_error = bp->bio_error; 939 if (disk != NULL) { 940 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 941 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 942 G_MIRROR_LOGREQ(0, bp, 943 "Request failed (error=%d).", 944 bp->bio_error); 945 } else { 946 G_MIRROR_LOGREQ(1, bp, 947 "Request failed (error=%d).", 948 bp->bio_error); 949 } 950 if (g_mirror_disconnect_on_failure && 951 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) 952 { 953 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 954 g_mirror_event_send(disk, 955 G_MIRROR_DISK_STATE_DISCONNECTED, 956 G_MIRROR_EVENT_DONTWAIT); 957 } 958 } 959 switch (pbp->bio_cmd) { 960 case BIO_DELETE: 961 case BIO_WRITE: 962 pbp->bio_inbed--; 963 pbp->bio_children--; 964 break; 965 } 966 } 967 g_destroy_bio(bp); 968 969 switch (pbp->bio_cmd) { 970 case BIO_READ: 971 if (pbp->bio_inbed < pbp->bio_children) 972 break; 973 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 1) 974 g_io_deliver(pbp, pbp->bio_error); 975 else { 976 pbp->bio_error = 0; 977 mtx_lock(&sc->sc_queue_mtx); 978 bioq_insert_tail(&sc->sc_queue, pbp); 979 mtx_unlock(&sc->sc_queue_mtx); 980 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 981 wakeup(sc); 982 } 983 break; 984 case BIO_DELETE: 985 case BIO_WRITE: 986 if (pbp->bio_children == 0) { 987 /* 988 * All requests failed. 989 */ 990 } else if (pbp->bio_inbed < pbp->bio_children) { 991 /* Do nothing. */ 992 break; 993 } else if (pbp->bio_children == pbp->bio_inbed) { 994 /* Some requests succeeded. */ 995 pbp->bio_error = 0; 996 pbp->bio_completed = pbp->bio_length; 997 } 998 bioq_remove(&sc->sc_inflight, pbp); 999 /* Release delayed sync requests if possible. */ 1000 g_mirror_sync_release(sc); 1001 g_io_deliver(pbp, pbp->bio_error); 1002 break; 1003 default: 1004 KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd)); 1005 break; 1006 } 1007} 1008 1009static void 1010g_mirror_sync_done(struct bio *bp) 1011{ 1012 struct g_mirror_softc *sc; 1013 1014 G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered."); 1015 sc = bp->bio_from->geom->softc; 1016 bp->bio_cflags = G_MIRROR_BIO_FLAG_SYNC; 1017 mtx_lock(&sc->sc_queue_mtx); 1018 bioq_insert_tail(&sc->sc_queue, bp); 1019 mtx_unlock(&sc->sc_queue_mtx); 1020 wakeup(sc); 1021} 1022 1023static void 1024g_mirror_candelete(struct bio *bp) 1025{ 1026 struct g_mirror_softc *sc; 1027 struct g_mirror_disk *disk; 1028 int *val; 1029 1030 sc = bp->bio_to->geom->softc; 1031 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1032 if (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) 1033 break; 1034 } 1035 val = (int *)bp->bio_data; 1036 *val = (disk != NULL); 1037 g_io_deliver(bp, 0); 1038} 1039 1040static void 1041g_mirror_kernel_dump(struct bio *bp) 1042{ 1043 struct g_mirror_softc *sc; 1044 struct g_mirror_disk *disk; 1045 struct bio *cbp; 1046 struct g_kerneldump *gkd; 1047 1048 /* 1049 * We configure dumping to the first component, because this component 1050 * will be used for reading with 'prefer' balance algorithm. 1051 * If the component with the highest priority is currently disconnected 1052 * we will not be able to read the dump after the reboot if it will be 1053 * connected and synchronized later. Can we do something better? 1054 */ 1055 sc = bp->bio_to->geom->softc; 1056 disk = LIST_FIRST(&sc->sc_disks); 1057 1058 gkd = (struct g_kerneldump *)bp->bio_data; 1059 if (gkd->length > bp->bio_to->mediasize) 1060 gkd->length = bp->bio_to->mediasize; 1061 cbp = g_clone_bio(bp); 1062 if (cbp == NULL) { 1063 g_io_deliver(bp, ENOMEM); 1064 return; 1065 } 1066 cbp->bio_done = g_std_done; 1067 g_io_request(cbp, disk->d_consumer); 1068 G_MIRROR_DEBUG(1, "Kernel dump will go to %s.", 1069 g_mirror_get_diskname(disk)); 1070} 1071 1072static void 1073g_mirror_flush(struct g_mirror_softc *sc, struct bio *bp) 1074{ 1075 struct bio_queue_head queue; 1076 struct g_mirror_disk *disk; 1077 struct g_consumer *cp; 1078 struct bio *cbp; 1079 1080 bioq_init(&queue); 1081 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1082 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1083 continue; 1084 cbp = g_clone_bio(bp); 1085 if (cbp == NULL) { 1086 while ((cbp = bioq_takefirst(&queue)) != NULL) 1087 g_destroy_bio(cbp); 1088 if (bp->bio_error == 0) 1089 bp->bio_error = ENOMEM; 1090 g_io_deliver(bp, bp->bio_error); 1091 return; 1092 } 1093 bioq_insert_tail(&queue, cbp); 1094 cbp->bio_done = g_mirror_flush_done; 1095 cbp->bio_caller1 = disk; 1096 cbp->bio_to = disk->d_consumer->provider; 1097 } 1098 while ((cbp = bioq_takefirst(&queue)) != NULL) { 1099 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1100 disk = cbp->bio_caller1; 1101 cbp->bio_caller1 = NULL; 1102 cp = disk->d_consumer; 1103 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1104 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1105 cp->acr, cp->acw, cp->ace)); 1106 g_io_request(cbp, disk->d_consumer); 1107 } 1108} 1109 1110static void 1111g_mirror_start(struct bio *bp) 1112{ 1113 struct g_mirror_softc *sc; 1114 1115 sc = bp->bio_to->geom->softc; 1116 /* 1117 * If sc == NULL or there are no valid disks, provider's error 1118 * should be set and g_mirror_start() should not be called at all. 1119 */ 1120 KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1121 ("Provider's error should be set (error=%d)(mirror=%s).", 1122 bp->bio_to->error, bp->bio_to->name)); 1123 G_MIRROR_LOGREQ(3, bp, "Request received."); 1124 1125 switch (bp->bio_cmd) { 1126 case BIO_READ: 1127 case BIO_WRITE: 1128 case BIO_DELETE: 1129 break; 1130 case BIO_FLUSH: 1131 g_mirror_flush(sc, bp); 1132 return; 1133 case BIO_GETATTR: 1134 if (!strcmp(bp->bio_attribute, "GEOM::candelete")) { 1135 g_mirror_candelete(bp); 1136 return; 1137 } else if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) { 1138 g_mirror_kernel_dump(bp); 1139 return; 1140 } 1141 /* FALLTHROUGH */ 1142 default: 1143 g_io_deliver(bp, EOPNOTSUPP); 1144 return; 1145 } 1146 mtx_lock(&sc->sc_queue_mtx); 1147 bioq_insert_tail(&sc->sc_queue, bp); 1148 mtx_unlock(&sc->sc_queue_mtx); 1149 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 1150 wakeup(sc); 1151} 1152 1153/* 1154 * Return TRUE if the given request is colliding with a in-progress 1155 * synchronization request. 1156 */ 1157static int 1158g_mirror_sync_collision(struct g_mirror_softc *sc, struct bio *bp) 1159{ 1160 struct g_mirror_disk *disk; 1161 struct bio *sbp; 1162 off_t rstart, rend, sstart, send; 1163 u_int i; 1164 1165 if (sc->sc_sync.ds_ndisks == 0) 1166 return (0); 1167 rstart = bp->bio_offset; 1168 rend = bp->bio_offset + bp->bio_length; 1169 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1170 if (disk->d_state != G_MIRROR_DISK_STATE_SYNCHRONIZING) 1171 continue; 1172 for (i = 0; i < g_mirror_syncreqs; i++) { 1173 sbp = disk->d_sync.ds_bios[i]; 1174 if (sbp == NULL) 1175 continue; 1176 sstart = sbp->bio_offset; 1177 send = sbp->bio_offset + sbp->bio_length; 1178 if (rend > sstart && rstart < send) 1179 return (1); 1180 } 1181 } 1182 return (0); 1183} 1184 1185/* 1186 * Return TRUE if the given sync request is colliding with a in-progress regular 1187 * request. 1188 */ 1189static int 1190g_mirror_regular_collision(struct g_mirror_softc *sc, struct bio *sbp) 1191{ 1192 off_t rstart, rend, sstart, send; 1193 struct bio *bp; 1194 1195 if (sc->sc_sync.ds_ndisks == 0) 1196 return (0); 1197 sstart = sbp->bio_offset; 1198 send = sbp->bio_offset + sbp->bio_length; 1199 TAILQ_FOREACH(bp, &sc->sc_inflight.queue, bio_queue) { 1200 rstart = bp->bio_offset; 1201 rend = bp->bio_offset + bp->bio_length; 1202 if (rend > sstart && rstart < send) 1203 return (1); 1204 } 1205 return (0); 1206} 1207 1208/* 1209 * Puts request onto delayed queue. 1210 */ 1211static void 1212g_mirror_regular_delay(struct g_mirror_softc *sc, struct bio *bp) 1213{ 1214 1215 G_MIRROR_LOGREQ(2, bp, "Delaying request."); 1216 bioq_insert_head(&sc->sc_regular_delayed, bp); 1217} 1218 1219/* 1220 * Puts synchronization request onto delayed queue. 1221 */ 1222static void 1223g_mirror_sync_delay(struct g_mirror_softc *sc, struct bio *bp) 1224{ 1225 1226 G_MIRROR_LOGREQ(2, bp, "Delaying synchronization request."); 1227 bioq_insert_tail(&sc->sc_sync_delayed, bp); 1228} 1229 1230/* 1231 * Releases delayed regular requests which don't collide anymore with sync 1232 * requests. 1233 */ 1234static void 1235g_mirror_regular_release(struct g_mirror_softc *sc) 1236{ 1237 struct bio *bp, *bp2; 1238 1239 TAILQ_FOREACH_SAFE(bp, &sc->sc_regular_delayed.queue, bio_queue, bp2) { 1240 if (g_mirror_sync_collision(sc, bp)) 1241 continue; 1242 bioq_remove(&sc->sc_regular_delayed, bp); 1243 G_MIRROR_LOGREQ(2, bp, "Releasing delayed request (%p).", bp); 1244 mtx_lock(&sc->sc_queue_mtx); 1245 bioq_insert_head(&sc->sc_queue, bp); 1246#if 0 1247 /* 1248 * wakeup() is not needed, because this function is called from 1249 * the worker thread. 1250 */ 1251 wakeup(&sc->sc_queue); 1252#endif 1253 mtx_unlock(&sc->sc_queue_mtx); 1254 } 1255} 1256 1257/* 1258 * Releases delayed sync requests which don't collide anymore with regular 1259 * requests. 1260 */ 1261static void 1262g_mirror_sync_release(struct g_mirror_softc *sc) 1263{ 1264 struct bio *bp, *bp2; 1265 1266 TAILQ_FOREACH_SAFE(bp, &sc->sc_sync_delayed.queue, bio_queue, bp2) { 1267 if (g_mirror_regular_collision(sc, bp)) 1268 continue; 1269 bioq_remove(&sc->sc_sync_delayed, bp); 1270 G_MIRROR_LOGREQ(2, bp, 1271 "Releasing delayed synchronization request."); 1272 g_io_request(bp, bp->bio_from); 1273 } 1274} 1275 1276/* 1277 * Handle synchronization requests. 1278 * Every synchronization request is two-steps process: first, READ request is 1279 * send to active provider and then WRITE request (with read data) to the provider 1280 * being synchronized. When WRITE is finished, new synchronization request is 1281 * send. 1282 */ 1283static void 1284g_mirror_sync_request(struct bio *bp) 1285{ 1286 struct g_mirror_softc *sc; 1287 struct g_mirror_disk *disk; 1288 1289 bp->bio_from->index--; 1290 sc = bp->bio_from->geom->softc; 1291 disk = bp->bio_from->private; 1292 if (disk == NULL) { 1293 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 1294 g_topology_lock(); 1295 g_mirror_kill_consumer(sc, bp->bio_from); 1296 g_topology_unlock(); 1297 free(bp->bio_data, M_MIRROR); 1298 g_destroy_bio(bp); 1299 sx_xlock(&sc->sc_lock); 1300 return; 1301 } 1302 1303 /* 1304 * Synchronization request. 1305 */ 1306 switch (bp->bio_cmd) { 1307 case BIO_READ: 1308 { 1309 struct g_consumer *cp; 1310 1311 if (bp->bio_error != 0) { 1312 G_MIRROR_LOGREQ(0, bp, 1313 "Synchronization request failed (error=%d).", 1314 bp->bio_error); 1315 g_destroy_bio(bp); 1316 return; 1317 } 1318 G_MIRROR_LOGREQ(3, bp, 1319 "Synchronization request half-finished."); 1320 bp->bio_cmd = BIO_WRITE; 1321 bp->bio_cflags = 0; 1322 cp = disk->d_consumer; 1323 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1324 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1325 cp->acr, cp->acw, cp->ace)); 1326 cp->index++; 1327 g_io_request(bp, cp); 1328 return; 1329 } 1330 case BIO_WRITE: 1331 { 1332 struct g_mirror_disk_sync *sync; 1333 off_t offset; 1334 void *data; 1335 int i; 1336 1337 if (bp->bio_error != 0) { 1338 G_MIRROR_LOGREQ(0, bp, 1339 "Synchronization request failed (error=%d).", 1340 bp->bio_error); 1341 g_destroy_bio(bp); 1342 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 1343 g_mirror_event_send(disk, 1344 G_MIRROR_DISK_STATE_DISCONNECTED, 1345 G_MIRROR_EVENT_DONTWAIT); 1346 return; 1347 } 1348 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished."); 1349 sync = &disk->d_sync; 1350 if (sync->ds_offset >= sc->sc_mediasize || 1351 sync->ds_consumer == NULL || 1352 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1353 /* Don't send more synchronization requests. */ 1354 sync->ds_inflight--; 1355 if (sync->ds_bios != NULL) { 1356 i = (int)(uintptr_t)bp->bio_caller1; 1357 sync->ds_bios[i] = NULL; 1358 } 1359 free(bp->bio_data, M_MIRROR); 1360 g_destroy_bio(bp); 1361 if (sync->ds_inflight > 0) 1362 return; 1363 if (sync->ds_consumer == NULL || 1364 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1365 return; 1366 } 1367 /* Disk up-to-date, activate it. */ 1368 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE, 1369 G_MIRROR_EVENT_DONTWAIT); 1370 return; 1371 } 1372 1373 /* Send next synchronization request. */ 1374 data = bp->bio_data; 1375 g_reset_bio(bp); 1376 bp->bio_cmd = BIO_READ; 1377 bp->bio_offset = sync->ds_offset; 1378 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset); 1379 sync->ds_offset += bp->bio_length; 1380 bp->bio_done = g_mirror_sync_done; 1381 bp->bio_data = data; 1382 bp->bio_from = sync->ds_consumer; 1383 bp->bio_to = sc->sc_provider; 1384 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 1385 sync->ds_consumer->index++; 1386 /* 1387 * Delay the request if it is colliding with a regular request. 1388 */ 1389 if (g_mirror_regular_collision(sc, bp)) 1390 g_mirror_sync_delay(sc, bp); 1391 else 1392 g_io_request(bp, sync->ds_consumer); 1393 1394 /* Release delayed requests if possible. */ 1395 g_mirror_regular_release(sc); 1396 1397 /* Find the smallest offset */ 1398 offset = sc->sc_mediasize; 1399 for (i = 0; i < g_mirror_syncreqs; i++) { 1400 bp = sync->ds_bios[i]; 1401 if (bp->bio_offset < offset) 1402 offset = bp->bio_offset; 1403 } 1404 if (sync->ds_offset_done + (MAXPHYS * 100) < offset) { 1405 /* Update offset_done on every 100 blocks. */ 1406 sync->ds_offset_done = offset; 1407 g_mirror_update_metadata(disk); 1408 } 1409 return; 1410 } 1411 default: 1412 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1413 bp->bio_cmd, sc->sc_name)); 1414 break; 1415 } 1416} 1417 1418static void 1419g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp) 1420{ 1421 struct g_mirror_disk *disk; 1422 struct g_consumer *cp; 1423 struct bio *cbp; 1424 1425 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1426 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE) 1427 break; 1428 } 1429 if (disk == NULL) { 1430 if (bp->bio_error == 0) 1431 bp->bio_error = ENXIO; 1432 g_io_deliver(bp, bp->bio_error); 1433 return; 1434 } 1435 cbp = g_clone_bio(bp); 1436 if (cbp == NULL) { 1437 if (bp->bio_error == 0) 1438 bp->bio_error = ENOMEM; 1439 g_io_deliver(bp, bp->bio_error); 1440 return; 1441 } 1442 /* 1443 * Fill in the component buf structure. 1444 */ 1445 cp = disk->d_consumer; 1446 cbp->bio_done = g_mirror_done; 1447 cbp->bio_to = cp->provider; 1448 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1449 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1450 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1451 cp->acw, cp->ace)); 1452 cp->index++; 1453 g_io_request(cbp, cp); 1454} 1455 1456static void 1457g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp) 1458{ 1459 struct g_mirror_disk *disk; 1460 struct g_consumer *cp; 1461 struct bio *cbp; 1462 1463 disk = g_mirror_get_disk(sc); 1464 if (disk == NULL) { 1465 if (bp->bio_error == 0) 1466 bp->bio_error = ENXIO; 1467 g_io_deliver(bp, bp->bio_error); 1468 return; 1469 } 1470 cbp = g_clone_bio(bp); 1471 if (cbp == NULL) { 1472 if (bp->bio_error == 0) 1473 bp->bio_error = ENOMEM; 1474 g_io_deliver(bp, bp->bio_error); 1475 return; 1476 } 1477 /* 1478 * Fill in the component buf structure. 1479 */ 1480 cp = disk->d_consumer; 1481 cbp->bio_done = g_mirror_done; 1482 cbp->bio_to = cp->provider; 1483 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1484 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1485 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1486 cp->acw, cp->ace)); 1487 cp->index++; 1488 g_io_request(cbp, cp); 1489} 1490 1491#define TRACK_SIZE (1 * 1024 * 1024) 1492#define LOAD_SCALE 256 1493#define ABS(x) (((x) >= 0) ? (x) : (-(x))) 1494 1495static void 1496g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp) 1497{ 1498 struct g_mirror_disk *disk, *dp; 1499 struct g_consumer *cp; 1500 struct bio *cbp; 1501 int prio, best; 1502 1503 /* Find a disk with the smallest load. */ 1504 disk = NULL; 1505 best = INT_MAX; 1506 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1507 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1508 continue; 1509 prio = dp->load; 1510 /* If disk head is precisely in position - highly prefer it. */ 1511 if (dp->d_last_offset == bp->bio_offset) 1512 prio -= 2 * LOAD_SCALE; 1513 else 1514 /* If disk head is close to position - prefer it. */ 1515 if (ABS(dp->d_last_offset - bp->bio_offset) < TRACK_SIZE) 1516 prio -= 1 * LOAD_SCALE; 1517 if (prio <= best) { 1518 disk = dp; 1519 best = prio; 1520 } 1521 } 1522 KASSERT(disk != NULL, ("NULL disk for %s.", sc->sc_name)); 1523 cbp = g_clone_bio(bp); 1524 if (cbp == NULL) { 1525 if (bp->bio_error == 0) 1526 bp->bio_error = ENOMEM; 1527 g_io_deliver(bp, bp->bio_error); 1528 return; 1529 } 1530 /* 1531 * Fill in the component buf structure. 1532 */ 1533 cp = disk->d_consumer; 1534 cbp->bio_done = g_mirror_done; 1535 cbp->bio_to = cp->provider; 1536 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1537 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1538 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1539 cp->acw, cp->ace)); 1540 cp->index++; 1541 /* Remember last head position */ 1542 disk->d_last_offset = bp->bio_offset + bp->bio_length; 1543 /* Update loads. */ 1544 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1545 dp->load = (dp->d_consumer->index * LOAD_SCALE + 1546 dp->load * 7) / 8; 1547 } 1548 g_io_request(cbp, cp); 1549} 1550 1551static void 1552g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp) 1553{ 1554 struct bio_queue_head queue; 1555 struct g_mirror_disk *disk; 1556 struct g_consumer *cp; 1557 struct bio *cbp; 1558 off_t left, mod, offset, slice; 1559 u_char *data; 1560 u_int ndisks; 1561 1562 if (bp->bio_length <= sc->sc_slice) { 1563 g_mirror_request_round_robin(sc, bp); 1564 return; 1565 } 1566 ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE); 1567 slice = bp->bio_length / ndisks; 1568 mod = slice % sc->sc_provider->sectorsize; 1569 if (mod != 0) 1570 slice += sc->sc_provider->sectorsize - mod; 1571 /* 1572 * Allocate all bios before sending any request, so we can 1573 * return ENOMEM in nice and clean way. 1574 */ 1575 left = bp->bio_length; 1576 offset = bp->bio_offset; 1577 data = bp->bio_data; 1578 bioq_init(&queue); 1579 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1580 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1581 continue; 1582 cbp = g_clone_bio(bp); 1583 if (cbp == NULL) { 1584 while ((cbp = bioq_takefirst(&queue)) != NULL) 1585 g_destroy_bio(cbp); 1586 if (bp->bio_error == 0) 1587 bp->bio_error = ENOMEM; 1588 g_io_deliver(bp, bp->bio_error); 1589 return; 1590 } 1591 bioq_insert_tail(&queue, cbp); 1592 cbp->bio_done = g_mirror_done; 1593 cbp->bio_caller1 = disk; 1594 cbp->bio_to = disk->d_consumer->provider; 1595 cbp->bio_offset = offset; 1596 cbp->bio_data = data; 1597 cbp->bio_length = MIN(left, slice); 1598 left -= cbp->bio_length; 1599 if (left == 0) 1600 break; 1601 offset += cbp->bio_length; 1602 data += cbp->bio_length; 1603 } 1604 while ((cbp = bioq_takefirst(&queue)) != NULL) { 1605 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1606 disk = cbp->bio_caller1; 1607 cbp->bio_caller1 = NULL; 1608 cp = disk->d_consumer; 1609 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1610 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1611 cp->acr, cp->acw, cp->ace)); 1612 disk->d_consumer->index++; 1613 g_io_request(cbp, disk->d_consumer); 1614 } 1615} 1616 1617static void 1618g_mirror_register_request(struct bio *bp) 1619{ 1620 struct g_mirror_softc *sc; 1621 1622 sc = bp->bio_to->geom->softc; 1623 switch (bp->bio_cmd) { 1624 case BIO_READ: 1625 switch (sc->sc_balance) { 1626 case G_MIRROR_BALANCE_LOAD: 1627 g_mirror_request_load(sc, bp); 1628 break; 1629 case G_MIRROR_BALANCE_PREFER: 1630 g_mirror_request_prefer(sc, bp); 1631 break; 1632 case G_MIRROR_BALANCE_ROUND_ROBIN: 1633 g_mirror_request_round_robin(sc, bp); 1634 break; 1635 case G_MIRROR_BALANCE_SPLIT: 1636 g_mirror_request_split(sc, bp); 1637 break; 1638 } 1639 return; 1640 case BIO_WRITE: 1641 case BIO_DELETE: 1642 { 1643 struct g_mirror_disk *disk; 1644 struct g_mirror_disk_sync *sync; 1645 struct bio_queue_head queue; 1646 struct g_consumer *cp; 1647 struct bio *cbp; 1648 1649 /* 1650 * Delay the request if it is colliding with a synchronization 1651 * request. 1652 */ 1653 if (g_mirror_sync_collision(sc, bp)) { 1654 g_mirror_regular_delay(sc, bp); 1655 return; 1656 } 1657 1658 if (sc->sc_idle) 1659 g_mirror_unidle(sc); 1660 else 1661 sc->sc_last_write = time_uptime; 1662 1663 /* 1664 * Allocate all bios before sending any request, so we can 1665 * return ENOMEM in nice and clean way. 1666 */ 1667 bioq_init(&queue); 1668 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1669 sync = &disk->d_sync; 1670 switch (disk->d_state) { 1671 case G_MIRROR_DISK_STATE_ACTIVE: 1672 break; 1673 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 1674 if (bp->bio_offset >= sync->ds_offset) 1675 continue; 1676 break; 1677 default: 1678 continue; 1679 } 1680 if (bp->bio_cmd == BIO_DELETE && 1681 (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) == 0) 1682 continue; 1683 cbp = g_clone_bio(bp); 1684 if (cbp == NULL) { 1685 while ((cbp = bioq_takefirst(&queue)) != NULL) 1686 g_destroy_bio(cbp); 1687 if (bp->bio_error == 0) 1688 bp->bio_error = ENOMEM; 1689 g_io_deliver(bp, bp->bio_error); 1690 return; 1691 } 1692 bioq_insert_tail(&queue, cbp); 1693 cbp->bio_done = g_mirror_done; 1694 cp = disk->d_consumer; 1695 cbp->bio_caller1 = cp; 1696 cbp->bio_to = cp->provider; 1697 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1698 ("Consumer %s not opened (r%dw%de%d).", 1699 cp->provider->name, cp->acr, cp->acw, cp->ace)); 1700 } 1701 if (bioq_first(&queue) == NULL) { 1702 g_io_deliver(bp, EOPNOTSUPP); 1703 return; 1704 } 1705 while ((cbp = bioq_takefirst(&queue)) != NULL) { 1706 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1707 cp = cbp->bio_caller1; 1708 cbp->bio_caller1 = NULL; 1709 cp->index++; 1710 sc->sc_writes++; 1711 g_io_request(cbp, cp); 1712 } 1713 /* 1714 * Put request onto inflight queue, so we can check if new 1715 * synchronization requests don't collide with it. 1716 */ 1717 bioq_insert_tail(&sc->sc_inflight, bp); 1718 /* 1719 * Bump syncid on first write. 1720 */ 1721 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) { 1722 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 1723 g_mirror_bump_syncid(sc); 1724 } 1725 return; 1726 } 1727 default: 1728 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1729 bp->bio_cmd, sc->sc_name)); 1730 break; 1731 } 1732} 1733 1734static int 1735g_mirror_can_destroy(struct g_mirror_softc *sc) 1736{ 1737 struct g_geom *gp; 1738 struct g_consumer *cp; 1739 1740 g_topology_assert(); 1741 gp = sc->sc_geom; 1742 if (gp->softc == NULL) 1743 return (1); 1744 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_TASTING) != 0) 1745 return (0); 1746 LIST_FOREACH(cp, &gp->consumer, consumer) { 1747 if (g_mirror_is_busy(sc, cp)) 1748 return (0); 1749 } 1750 gp = sc->sc_sync.ds_geom; 1751 LIST_FOREACH(cp, &gp->consumer, consumer) { 1752 if (g_mirror_is_busy(sc, cp)) 1753 return (0); 1754 } 1755 G_MIRROR_DEBUG(2, "No I/O requests for %s, it can be destroyed.", 1756 sc->sc_name); 1757 return (1); 1758} 1759 1760static int 1761g_mirror_try_destroy(struct g_mirror_softc *sc) 1762{ 1763 1764 if (sc->sc_rootmount != NULL) { 1765 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 1766 sc->sc_rootmount); 1767 root_mount_rel(sc->sc_rootmount); 1768 sc->sc_rootmount = NULL; 1769 } 1770 g_topology_lock(); 1771 if (!g_mirror_can_destroy(sc)) { 1772 g_topology_unlock(); 1773 return (0); 1774 } 1775 sc->sc_geom->softc = NULL; 1776 sc->sc_sync.ds_geom->softc = NULL; 1777 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WAIT) != 0) { 1778 g_topology_unlock(); 1779 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1780 &sc->sc_worker); 1781 /* Unlock sc_lock here, as it can be destroyed after wakeup. */ 1782 sx_xunlock(&sc->sc_lock); 1783 wakeup(&sc->sc_worker); 1784 sc->sc_worker = NULL; 1785 } else { 1786 g_topology_unlock(); 1787 g_mirror_destroy_device(sc); 1788 free(sc, M_MIRROR); 1789 } 1790 return (1); 1791} 1792 1793/* 1794 * Worker thread. 1795 */ 1796static void 1797g_mirror_worker(void *arg) 1798{ 1799 struct g_mirror_softc *sc; 1800 struct g_mirror_event *ep; 1801 struct bio *bp; 1802 int timeout; 1803 1804 sc = arg; 1805 thread_lock(curthread); 1806 sched_prio(curthread, PRIBIO); 1807 thread_unlock(curthread); 1808 1809 sx_xlock(&sc->sc_lock); 1810 for (;;) { 1811 G_MIRROR_DEBUG(5, "%s: Let's see...", __func__); 1812 /* 1813 * First take a look at events. 1814 * This is important to handle events before any I/O requests. 1815 */ 1816 ep = g_mirror_event_get(sc); 1817 if (ep != NULL) { 1818 g_mirror_event_remove(sc, ep); 1819 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) { 1820 /* Update only device status. */ 1821 G_MIRROR_DEBUG(3, 1822 "Running event for device %s.", 1823 sc->sc_name); 1824 ep->e_error = 0; 1825 g_mirror_update_device(sc, 1); 1826 } else { 1827 /* Update disk status. */ 1828 G_MIRROR_DEBUG(3, "Running event for disk %s.", 1829 g_mirror_get_diskname(ep->e_disk)); 1830 ep->e_error = g_mirror_update_disk(ep->e_disk, 1831 ep->e_state); 1832 if (ep->e_error == 0) 1833 g_mirror_update_device(sc, 0); 1834 } 1835 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) { 1836 KASSERT(ep->e_error == 0, 1837 ("Error cannot be handled.")); 1838 g_mirror_event_free(ep); 1839 } else { 1840 ep->e_flags |= G_MIRROR_EVENT_DONE; 1841 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1842 ep); 1843 mtx_lock(&sc->sc_events_mtx); 1844 wakeup(ep); 1845 mtx_unlock(&sc->sc_events_mtx); 1846 } 1847 if ((sc->sc_flags & 1848 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1849 if (g_mirror_try_destroy(sc)) { 1850 curthread->td_pflags &= ~TDP_GEOM; 1851 G_MIRROR_DEBUG(1, "Thread exiting."); 1852 kproc_exit(0); 1853 } 1854 } 1855 G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__); 1856 continue; 1857 } 1858 /* 1859 * Check if we can mark array as CLEAN and if we can't take 1860 * how much seconds should we wait. 1861 */ 1862 timeout = g_mirror_idle(sc, -1); 1863 /* 1864 * Now I/O requests. 1865 */ 1866 /* Get first request from the queue. */ 1867 mtx_lock(&sc->sc_queue_mtx); 1868 bp = bioq_takefirst(&sc->sc_queue); 1869 if (bp == NULL) { 1870 if ((sc->sc_flags & 1871 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1872 mtx_unlock(&sc->sc_queue_mtx); 1873 if (g_mirror_try_destroy(sc)) { 1874 curthread->td_pflags &= ~TDP_GEOM; 1875 G_MIRROR_DEBUG(1, "Thread exiting."); 1876 kproc_exit(0); 1877 } 1878 mtx_lock(&sc->sc_queue_mtx); 1879 } 1880 sx_xunlock(&sc->sc_lock); 1881 /* 1882 * XXX: We can miss an event here, because an event 1883 * can be added without sx-device-lock and without 1884 * mtx-queue-lock. Maybe I should just stop using 1885 * dedicated mutex for events synchronization and 1886 * stick with the queue lock? 1887 * The event will hang here until next I/O request 1888 * or next event is received. 1889 */ 1890 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w1", 1891 timeout * hz); 1892 sx_xlock(&sc->sc_lock); 1893 G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__); 1894 continue; 1895 } 1896 mtx_unlock(&sc->sc_queue_mtx); 1897 1898 if (bp->bio_from->geom == sc->sc_sync.ds_geom && 1899 (bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) { 1900 g_mirror_sync_request(bp); /* READ */ 1901 } else if (bp->bio_to != sc->sc_provider) { 1902 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0) 1903 g_mirror_regular_request(bp); 1904 else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 1905 g_mirror_sync_request(bp); /* WRITE */ 1906 else { 1907 KASSERT(0, 1908 ("Invalid request cflags=0x%hx to=%s.", 1909 bp->bio_cflags, bp->bio_to->name)); 1910 } 1911 } else { 1912 g_mirror_register_request(bp); 1913 } 1914 G_MIRROR_DEBUG(5, "%s: I'm here 9.", __func__); 1915 } 1916} 1917 1918static void 1919g_mirror_update_idle(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 1920{ 1921 1922 sx_assert(&sc->sc_lock, SX_LOCKED); 1923 1924 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 1925 return; 1926 if (!sc->sc_idle && (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) { 1927 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.", 1928 g_mirror_get_diskname(disk), sc->sc_name); 1929 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1930 } else if (sc->sc_idle && 1931 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 1932 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.", 1933 g_mirror_get_diskname(disk), sc->sc_name); 1934 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 1935 } 1936} 1937 1938static void 1939g_mirror_sync_start(struct g_mirror_disk *disk) 1940{ 1941 struct g_mirror_softc *sc; 1942 struct g_consumer *cp; 1943 struct bio *bp; 1944 int error, i; 1945 1946 g_topology_assert_not(); 1947 sc = disk->d_softc; 1948 sx_assert(&sc->sc_lock, SX_LOCKED); 1949 1950 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 1951 ("Disk %s is not marked for synchronization.", 1952 g_mirror_get_diskname(disk))); 1953 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1954 ("Device not in RUNNING state (%s, %u).", sc->sc_name, 1955 sc->sc_state)); 1956 1957 sx_xunlock(&sc->sc_lock); 1958 g_topology_lock(); 1959 cp = g_new_consumer(sc->sc_sync.ds_geom); 1960 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 1961 error = g_attach(cp, sc->sc_provider); 1962 KASSERT(error == 0, 1963 ("Cannot attach to %s (error=%d).", sc->sc_name, error)); 1964 error = g_access(cp, 1, 0, 0); 1965 KASSERT(error == 0, ("Cannot open %s (error=%d).", sc->sc_name, error)); 1966 g_topology_unlock(); 1967 sx_xlock(&sc->sc_lock); 1968 1969 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name, 1970 g_mirror_get_diskname(disk)); 1971 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) == 0) 1972 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1973 KASSERT(disk->d_sync.ds_consumer == NULL, 1974 ("Sync consumer already exists (device=%s, disk=%s).", 1975 sc->sc_name, g_mirror_get_diskname(disk))); 1976 1977 disk->d_sync.ds_consumer = cp; 1978 disk->d_sync.ds_consumer->private = disk; 1979 disk->d_sync.ds_consumer->index = 0; 1980 1981 /* 1982 * Allocate memory for synchronization bios and initialize them. 1983 */ 1984 disk->d_sync.ds_bios = malloc(sizeof(struct bio *) * g_mirror_syncreqs, 1985 M_MIRROR, M_WAITOK); 1986 for (i = 0; i < g_mirror_syncreqs; i++) { 1987 bp = g_alloc_bio(); 1988 disk->d_sync.ds_bios[i] = bp; 1989 bp->bio_parent = NULL; 1990 bp->bio_cmd = BIO_READ; 1991 bp->bio_data = malloc(MAXPHYS, M_MIRROR, M_WAITOK); 1992 bp->bio_cflags = 0; 1993 bp->bio_offset = disk->d_sync.ds_offset; 1994 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset); 1995 disk->d_sync.ds_offset += bp->bio_length; 1996 bp->bio_done = g_mirror_sync_done; 1997 bp->bio_from = disk->d_sync.ds_consumer; 1998 bp->bio_to = sc->sc_provider; 1999 bp->bio_caller1 = (void *)(uintptr_t)i; 2000 } 2001 2002 /* Increase the number of disks in SYNCHRONIZING state. */ 2003 sc->sc_sync.ds_ndisks++; 2004 /* Set the number of in-flight synchronization requests. */ 2005 disk->d_sync.ds_inflight = g_mirror_syncreqs; 2006 2007 /* 2008 * Fire off first synchronization requests. 2009 */ 2010 for (i = 0; i < g_mirror_syncreqs; i++) { 2011 bp = disk->d_sync.ds_bios[i]; 2012 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 2013 disk->d_sync.ds_consumer->index++; 2014 /* 2015 * Delay the request if it is colliding with a regular request. 2016 */ 2017 if (g_mirror_regular_collision(sc, bp)) 2018 g_mirror_sync_delay(sc, bp); 2019 else 2020 g_io_request(bp, disk->d_sync.ds_consumer); 2021 } 2022} 2023 2024/* 2025 * Stop synchronization process. 2026 * type: 0 - synchronization finished 2027 * 1 - synchronization stopped 2028 */ 2029static void 2030g_mirror_sync_stop(struct g_mirror_disk *disk, int type) 2031{ 2032 struct g_mirror_softc *sc; 2033 struct g_consumer *cp; 2034 2035 g_topology_assert_not(); 2036 sc = disk->d_softc; 2037 sx_assert(&sc->sc_lock, SX_LOCKED); 2038 2039 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2040 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2041 g_mirror_disk_state2str(disk->d_state))); 2042 if (disk->d_sync.ds_consumer == NULL) 2043 return; 2044 2045 if (type == 0) { 2046 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.", 2047 sc->sc_name, g_mirror_get_diskname(disk)); 2048 } else /* if (type == 1) */ { 2049 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.", 2050 sc->sc_name, g_mirror_get_diskname(disk)); 2051 } 2052 free(disk->d_sync.ds_bios, M_MIRROR); 2053 disk->d_sync.ds_bios = NULL; 2054 cp = disk->d_sync.ds_consumer; 2055 disk->d_sync.ds_consumer = NULL; 2056 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2057 sc->sc_sync.ds_ndisks--; 2058 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 2059 g_topology_lock(); 2060 g_mirror_kill_consumer(sc, cp); 2061 g_topology_unlock(); 2062 sx_xlock(&sc->sc_lock); 2063} 2064 2065static void 2066g_mirror_launch_provider(struct g_mirror_softc *sc) 2067{ 2068 struct g_mirror_disk *disk; 2069 struct g_provider *pp, *dp; 2070 2071 sx_assert(&sc->sc_lock, SX_LOCKED); 2072 2073 g_topology_lock(); 2074 pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name); 2075 pp->flags |= G_PF_DIRECT_RECEIVE; 2076 pp->mediasize = sc->sc_mediasize; 2077 pp->sectorsize = sc->sc_sectorsize; 2078 pp->stripesize = 0; 2079 pp->stripeoffset = 0; 2080 2081 /* Splitting of unmapped BIO's could work but isn't implemented now */ 2082 if (sc->sc_balance != G_MIRROR_BALANCE_SPLIT) 2083 pp->flags |= G_PF_ACCEPT_UNMAPPED; 2084 2085 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2086 if (disk->d_consumer && disk->d_consumer->provider) { 2087 dp = disk->d_consumer->provider; 2088 if (dp->stripesize > pp->stripesize) { 2089 pp->stripesize = dp->stripesize; 2090 pp->stripeoffset = dp->stripeoffset; 2091 } 2092 /* A provider underneath us doesn't support unmapped */ 2093 if ((dp->flags & G_PF_ACCEPT_UNMAPPED) == 0) { 2094 G_MIRROR_DEBUG(0, "Cancelling unmapped " 2095 "because of %s.", dp->name); 2096 pp->flags &= ~G_PF_ACCEPT_UNMAPPED; 2097 } 2098 } 2099 } 2100 sc->sc_provider = pp; 2101 g_error_provider(pp, 0); 2102 g_topology_unlock(); 2103 G_MIRROR_DEBUG(0, "Device %s launched (%u/%u).", pp->name, 2104 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE), sc->sc_ndisks); 2105 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2106 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2107 g_mirror_sync_start(disk); 2108 } 2109} 2110 2111static void 2112g_mirror_destroy_provider(struct g_mirror_softc *sc) 2113{ 2114 struct g_mirror_disk *disk; 2115 struct bio *bp; 2116 2117 g_topology_assert_not(); 2118 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).", 2119 sc->sc_name)); 2120 2121 g_topology_lock(); 2122 g_error_provider(sc->sc_provider, ENXIO); 2123 mtx_lock(&sc->sc_queue_mtx); 2124 while ((bp = bioq_takefirst(&sc->sc_queue)) != NULL) { 2125 /* 2126 * Abort any pending I/O that wasn't generated by us. 2127 * Synchronization requests and requests destined for individual 2128 * mirror components can be destroyed immediately. 2129 */ 2130 if (bp->bio_to == sc->sc_provider && 2131 bp->bio_from->geom != sc->sc_sync.ds_geom) { 2132 g_io_deliver(bp, ENXIO); 2133 } else { 2134 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 2135 free(bp->bio_data, M_MIRROR); 2136 g_destroy_bio(bp); 2137 } 2138 } 2139 mtx_unlock(&sc->sc_queue_mtx); 2140 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", sc->sc_name, 2141 sc->sc_provider->name); 2142 sc->sc_provider->flags |= G_PF_WITHER; 2143 g_orphan_provider(sc->sc_provider, ENXIO); 2144 g_topology_unlock(); 2145 sc->sc_provider = NULL; 2146 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2147 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2148 g_mirror_sync_stop(disk, 1); 2149 } 2150} 2151 2152static void 2153g_mirror_go(void *arg) 2154{ 2155 struct g_mirror_softc *sc; 2156 2157 sc = arg; 2158 G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name); 2159 g_mirror_event_send(sc, 0, 2160 G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE); 2161} 2162 2163static u_int 2164g_mirror_determine_state(struct g_mirror_disk *disk) 2165{ 2166 struct g_mirror_softc *sc; 2167 u_int state; 2168 2169 sc = disk->d_softc; 2170 if (sc->sc_syncid == disk->d_sync.ds_syncid) { 2171 if ((disk->d_flags & 2172 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2173 /* Disk does not need synchronization. */ 2174 state = G_MIRROR_DISK_STATE_ACTIVE; 2175 } else { 2176 if ((sc->sc_flags & 2177 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2178 (disk->d_flags & 2179 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2180 /* 2181 * We can start synchronization from 2182 * the stored offset. 2183 */ 2184 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2185 } else { 2186 state = G_MIRROR_DISK_STATE_STALE; 2187 } 2188 } 2189 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) { 2190 /* 2191 * Reset all synchronization data for this disk, 2192 * because if it even was synchronized, it was 2193 * synchronized to disks with different syncid. 2194 */ 2195 disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2196 disk->d_sync.ds_offset = 0; 2197 disk->d_sync.ds_offset_done = 0; 2198 disk->d_sync.ds_syncid = sc->sc_syncid; 2199 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2200 (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2201 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2202 } else { 2203 state = G_MIRROR_DISK_STATE_STALE; 2204 } 2205 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ { 2206 /* 2207 * Not good, NOT GOOD! 2208 * It means that mirror was started on stale disks 2209 * and more fresh disk just arrive. 2210 * If there were writes, mirror is broken, sorry. 2211 * I think the best choice here is don't touch 2212 * this disk and inform the user loudly. 2213 */ 2214 G_MIRROR_DEBUG(0, "Device %s was started before the freshest " 2215 "disk (%s) arrives!! It will not be connected to the " 2216 "running device.", sc->sc_name, 2217 g_mirror_get_diskname(disk)); 2218 g_mirror_destroy_disk(disk); 2219 state = G_MIRROR_DISK_STATE_NONE; 2220 /* Return immediately, because disk was destroyed. */ 2221 return (state); 2222 } 2223 G_MIRROR_DEBUG(3, "State for %s disk: %s.", 2224 g_mirror_get_diskname(disk), g_mirror_disk_state2str(state)); 2225 return (state); 2226} 2227 2228/* 2229 * Update device state. 2230 */ 2231static void 2232g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force) 2233{ 2234 struct g_mirror_disk *disk; 2235 u_int state; 2236 2237 sx_assert(&sc->sc_lock, SX_XLOCKED); 2238 2239 switch (sc->sc_state) { 2240 case G_MIRROR_DEVICE_STATE_STARTING: 2241 { 2242 struct g_mirror_disk *pdisk, *tdisk; 2243 u_int dirty, ndisks, genid, syncid; 2244 2245 KASSERT(sc->sc_provider == NULL, 2246 ("Non-NULL provider in STARTING state (%s).", sc->sc_name)); 2247 /* 2248 * Are we ready? We are, if all disks are connected or 2249 * if we have any disks and 'force' is true. 2250 */ 2251 ndisks = g_mirror_ndisks(sc, -1); 2252 if (sc->sc_ndisks == ndisks || (force && ndisks > 0)) { 2253 ; 2254 } else if (ndisks == 0) { 2255 /* 2256 * Disks went down in starting phase, so destroy 2257 * device. 2258 */ 2259 callout_drain(&sc->sc_callout); 2260 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2261 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 2262 sc->sc_rootmount); 2263 root_mount_rel(sc->sc_rootmount); 2264 sc->sc_rootmount = NULL; 2265 return; 2266 } else { 2267 return; 2268 } 2269 2270 /* 2271 * Activate all disks with the biggest syncid. 2272 */ 2273 if (force) { 2274 /* 2275 * If 'force' is true, we have been called due to 2276 * timeout, so don't bother canceling timeout. 2277 */ 2278 ndisks = 0; 2279 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2280 if ((disk->d_flags & 2281 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2282 ndisks++; 2283 } 2284 } 2285 if (ndisks == 0) { 2286 /* No valid disks found, destroy device. */ 2287 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2288 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2289 __LINE__, sc->sc_rootmount); 2290 root_mount_rel(sc->sc_rootmount); 2291 sc->sc_rootmount = NULL; 2292 return; 2293 } 2294 } else { 2295 /* Cancel timeout. */ 2296 callout_drain(&sc->sc_callout); 2297 } 2298 2299 /* 2300 * Find the biggest genid. 2301 */ 2302 genid = 0; 2303 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2304 if (disk->d_genid > genid) 2305 genid = disk->d_genid; 2306 } 2307 sc->sc_genid = genid; 2308 /* 2309 * Remove all disks without the biggest genid. 2310 */ 2311 LIST_FOREACH_SAFE(disk, &sc->sc_disks, d_next, tdisk) { 2312 if (disk->d_genid < genid) { 2313 G_MIRROR_DEBUG(0, 2314 "Component %s (device %s) broken, skipping.", 2315 g_mirror_get_diskname(disk), sc->sc_name); 2316 g_mirror_destroy_disk(disk); 2317 } 2318 } 2319 2320 /* 2321 * Find the biggest syncid. 2322 */ 2323 syncid = 0; 2324 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2325 if (disk->d_sync.ds_syncid > syncid) 2326 syncid = disk->d_sync.ds_syncid; 2327 } 2328 2329 /* 2330 * Here we need to look for dirty disks and if all disks 2331 * with the biggest syncid are dirty, we have to choose 2332 * one with the biggest priority and rebuild the rest. 2333 */ 2334 /* 2335 * Find the number of dirty disks with the biggest syncid. 2336 * Find the number of disks with the biggest syncid. 2337 * While here, find a disk with the biggest priority. 2338 */ 2339 dirty = ndisks = 0; 2340 pdisk = NULL; 2341 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2342 if (disk->d_sync.ds_syncid != syncid) 2343 continue; 2344 if ((disk->d_flags & 2345 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2346 continue; 2347 } 2348 ndisks++; 2349 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 2350 dirty++; 2351 if (pdisk == NULL || 2352 pdisk->d_priority < disk->d_priority) { 2353 pdisk = disk; 2354 } 2355 } 2356 } 2357 if (dirty == 0) { 2358 /* No dirty disks at all, great. */ 2359 } else if (dirty == ndisks) { 2360 /* 2361 * Force synchronization for all dirty disks except one 2362 * with the biggest priority. 2363 */ 2364 KASSERT(pdisk != NULL, ("pdisk == NULL")); 2365 G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a " 2366 "master disk for synchronization.", 2367 g_mirror_get_diskname(pdisk), sc->sc_name); 2368 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2369 if (disk->d_sync.ds_syncid != syncid) 2370 continue; 2371 if ((disk->d_flags & 2372 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2373 continue; 2374 } 2375 KASSERT((disk->d_flags & 2376 G_MIRROR_DISK_FLAG_DIRTY) != 0, 2377 ("Disk %s isn't marked as dirty.", 2378 g_mirror_get_diskname(disk))); 2379 /* Skip the disk with the biggest priority. */ 2380 if (disk == pdisk) 2381 continue; 2382 disk->d_sync.ds_syncid = 0; 2383 } 2384 } else if (dirty < ndisks) { 2385 /* 2386 * Force synchronization for all dirty disks. 2387 * We have some non-dirty disks. 2388 */ 2389 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2390 if (disk->d_sync.ds_syncid != syncid) 2391 continue; 2392 if ((disk->d_flags & 2393 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2394 continue; 2395 } 2396 if ((disk->d_flags & 2397 G_MIRROR_DISK_FLAG_DIRTY) == 0) { 2398 continue; 2399 } 2400 disk->d_sync.ds_syncid = 0; 2401 } 2402 } 2403 2404 /* Reset hint. */ 2405 sc->sc_hint = NULL; 2406 sc->sc_syncid = syncid; 2407 if (force) { 2408 /* Remember to bump syncid on first write. */ 2409 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2410 } 2411 state = G_MIRROR_DEVICE_STATE_RUNNING; 2412 G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.", 2413 sc->sc_name, g_mirror_device_state2str(sc->sc_state), 2414 g_mirror_device_state2str(state)); 2415 sc->sc_state = state; 2416 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2417 state = g_mirror_determine_state(disk); 2418 g_mirror_event_send(disk, state, 2419 G_MIRROR_EVENT_DONTWAIT); 2420 if (state == G_MIRROR_DISK_STATE_STALE) 2421 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2422 } 2423 break; 2424 } 2425 case G_MIRROR_DEVICE_STATE_RUNNING: 2426 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 && 2427 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2428 /* 2429 * No active disks or no disks at all, 2430 * so destroy device. 2431 */ 2432 if (sc->sc_provider != NULL) 2433 g_mirror_destroy_provider(sc); 2434 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2435 break; 2436 } else if (g_mirror_ndisks(sc, 2437 G_MIRROR_DISK_STATE_ACTIVE) > 0 && 2438 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2439 /* 2440 * We have active disks, launch provider if it doesn't 2441 * exist. 2442 */ 2443 if (sc->sc_provider == NULL) 2444 g_mirror_launch_provider(sc); 2445 if (sc->sc_rootmount != NULL) { 2446 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2447 __LINE__, sc->sc_rootmount); 2448 root_mount_rel(sc->sc_rootmount); 2449 sc->sc_rootmount = NULL; 2450 } 2451 } 2452 /* 2453 * Genid should be bumped immediately, so do it here. 2454 */ 2455 if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID) != 0) { 2456 sc->sc_bump_id &= ~G_MIRROR_BUMP_GENID; 2457 g_mirror_bump_genid(sc); 2458 } 2459 break; 2460 default: 2461 KASSERT(1 == 0, ("Wrong device state (%s, %s).", 2462 sc->sc_name, g_mirror_device_state2str(sc->sc_state))); 2463 break; 2464 } 2465} 2466 2467/* 2468 * Update disk state and device state if needed. 2469 */ 2470#define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \ 2471 "Disk %s state changed from %s to %s (device %s).", \ 2472 g_mirror_get_diskname(disk), \ 2473 g_mirror_disk_state2str(disk->d_state), \ 2474 g_mirror_disk_state2str(state), sc->sc_name) 2475static int 2476g_mirror_update_disk(struct g_mirror_disk *disk, u_int state) 2477{ 2478 struct g_mirror_softc *sc; 2479 2480 sc = disk->d_softc; 2481 sx_assert(&sc->sc_lock, SX_XLOCKED); 2482 2483again: 2484 G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.", 2485 g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state), 2486 g_mirror_disk_state2str(state)); 2487 switch (state) { 2488 case G_MIRROR_DISK_STATE_NEW: 2489 /* 2490 * Possible scenarios: 2491 * 1. New disk arrive. 2492 */ 2493 /* Previous state should be NONE. */ 2494 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE, 2495 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2496 g_mirror_disk_state2str(disk->d_state))); 2497 DISK_STATE_CHANGED(); 2498 2499 disk->d_state = state; 2500 if (LIST_EMPTY(&sc->sc_disks)) 2501 LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next); 2502 else { 2503 struct g_mirror_disk *dp; 2504 2505 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 2506 if (disk->d_priority >= dp->d_priority) { 2507 LIST_INSERT_BEFORE(dp, disk, d_next); 2508 dp = NULL; 2509 break; 2510 } 2511 if (LIST_NEXT(dp, d_next) == NULL) 2512 break; 2513 } 2514 if (dp != NULL) 2515 LIST_INSERT_AFTER(dp, disk, d_next); 2516 } 2517 G_MIRROR_DEBUG(1, "Device %s: provider %s detected.", 2518 sc->sc_name, g_mirror_get_diskname(disk)); 2519 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 2520 break; 2521 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2522 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2523 g_mirror_device_state2str(sc->sc_state), 2524 g_mirror_get_diskname(disk), 2525 g_mirror_disk_state2str(disk->d_state))); 2526 state = g_mirror_determine_state(disk); 2527 if (state != G_MIRROR_DISK_STATE_NONE) 2528 goto again; 2529 break; 2530 case G_MIRROR_DISK_STATE_ACTIVE: 2531 /* 2532 * Possible scenarios: 2533 * 1. New disk does not need synchronization. 2534 * 2. Synchronization process finished successfully. 2535 */ 2536 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2537 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2538 g_mirror_device_state2str(sc->sc_state), 2539 g_mirror_get_diskname(disk), 2540 g_mirror_disk_state2str(disk->d_state))); 2541 /* Previous state should be NEW or SYNCHRONIZING. */ 2542 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW || 2543 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2544 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2545 g_mirror_disk_state2str(disk->d_state))); 2546 DISK_STATE_CHANGED(); 2547 2548 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2549 disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2550 disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC; 2551 g_mirror_sync_stop(disk, 0); 2552 } 2553 disk->d_state = state; 2554 disk->d_sync.ds_offset = 0; 2555 disk->d_sync.ds_offset_done = 0; 2556 g_mirror_update_idle(sc, disk); 2557 g_mirror_update_metadata(disk); 2558 G_MIRROR_DEBUG(1, "Device %s: provider %s activated.", 2559 sc->sc_name, g_mirror_get_diskname(disk)); 2560 break; 2561 case G_MIRROR_DISK_STATE_STALE: 2562 /* 2563 * Possible scenarios: 2564 * 1. Stale disk was connected. 2565 */ 2566 /* Previous state should be NEW. */ 2567 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2568 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2569 g_mirror_disk_state2str(disk->d_state))); 2570 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2571 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2572 g_mirror_device_state2str(sc->sc_state), 2573 g_mirror_get_diskname(disk), 2574 g_mirror_disk_state2str(disk->d_state))); 2575 /* 2576 * STALE state is only possible if device is marked 2577 * NOAUTOSYNC. 2578 */ 2579 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0, 2580 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2581 g_mirror_device_state2str(sc->sc_state), 2582 g_mirror_get_diskname(disk), 2583 g_mirror_disk_state2str(disk->d_state))); 2584 DISK_STATE_CHANGED(); 2585 2586 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2587 disk->d_state = state; 2588 g_mirror_update_metadata(disk); 2589 G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.", 2590 sc->sc_name, g_mirror_get_diskname(disk)); 2591 break; 2592 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 2593 /* 2594 * Possible scenarios: 2595 * 1. Disk which needs synchronization was connected. 2596 */ 2597 /* Previous state should be NEW. */ 2598 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2599 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2600 g_mirror_disk_state2str(disk->d_state))); 2601 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2602 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2603 g_mirror_device_state2str(sc->sc_state), 2604 g_mirror_get_diskname(disk), 2605 g_mirror_disk_state2str(disk->d_state))); 2606 DISK_STATE_CHANGED(); 2607 2608 if (disk->d_state == G_MIRROR_DISK_STATE_NEW) 2609 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2610 disk->d_state = state; 2611 if (sc->sc_provider != NULL) { 2612 g_mirror_sync_start(disk); 2613 g_mirror_update_metadata(disk); 2614 } 2615 break; 2616 case G_MIRROR_DISK_STATE_DISCONNECTED: 2617 /* 2618 * Possible scenarios: 2619 * 1. Device wasn't running yet, but disk disappear. 2620 * 2. Disk was active and disapppear. 2621 * 3. Disk disappear during synchronization process. 2622 */ 2623 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) { 2624 /* 2625 * Previous state should be ACTIVE, STALE or 2626 * SYNCHRONIZING. 2627 */ 2628 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 2629 disk->d_state == G_MIRROR_DISK_STATE_STALE || 2630 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2631 ("Wrong disk state (%s, %s).", 2632 g_mirror_get_diskname(disk), 2633 g_mirror_disk_state2str(disk->d_state))); 2634 } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) { 2635 /* Previous state should be NEW. */ 2636 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2637 ("Wrong disk state (%s, %s).", 2638 g_mirror_get_diskname(disk), 2639 g_mirror_disk_state2str(disk->d_state))); 2640 /* 2641 * Reset bumping syncid if disk disappeared in STARTING 2642 * state. 2643 */ 2644 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) 2645 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 2646#ifdef INVARIANTS 2647 } else { 2648 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).", 2649 sc->sc_name, 2650 g_mirror_device_state2str(sc->sc_state), 2651 g_mirror_get_diskname(disk), 2652 g_mirror_disk_state2str(disk->d_state))); 2653#endif 2654 } 2655 DISK_STATE_CHANGED(); 2656 G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.", 2657 sc->sc_name, g_mirror_get_diskname(disk)); 2658 2659 g_mirror_destroy_disk(disk); 2660 break; 2661 case G_MIRROR_DISK_STATE_DESTROY: 2662 { 2663 int error; 2664 2665 error = g_mirror_clear_metadata(disk); 2666 if (error != 0) 2667 return (error); 2668 DISK_STATE_CHANGED(); 2669 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", 2670 sc->sc_name, g_mirror_get_diskname(disk)); 2671 2672 g_mirror_destroy_disk(disk); 2673 sc->sc_ndisks--; 2674 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2675 g_mirror_update_metadata(disk); 2676 } 2677 break; 2678 } 2679 default: 2680 KASSERT(1 == 0, ("Unknown state (%u).", state)); 2681 break; 2682 } 2683 return (0); 2684} 2685#undef DISK_STATE_CHANGED 2686 2687int 2688g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md) 2689{ 2690 struct g_provider *pp; 2691 u_char *buf; 2692 int error; 2693 2694 g_topology_assert(); 2695 2696 error = g_access(cp, 1, 0, 0); 2697 if (error != 0) 2698 return (error); 2699 pp = cp->provider; 2700 g_topology_unlock(); 2701 /* Metadata are stored on last sector. */ 2702 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 2703 &error); 2704 g_topology_lock(); 2705 g_access(cp, -1, 0, 0); 2706 if (buf == NULL) { 2707 G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).", 2708 cp->provider->name, error); 2709 return (error); 2710 } 2711 2712 /* Decode metadata. */ 2713 error = mirror_metadata_decode(buf, md); 2714 g_free(buf); 2715 if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0) 2716 return (EINVAL); 2717 if (md->md_version > G_MIRROR_VERSION) { 2718 G_MIRROR_DEBUG(0, 2719 "Kernel module is too old to handle metadata from %s.", 2720 cp->provider->name); 2721 return (EINVAL); 2722 } 2723 if (error != 0) { 2724 G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.", 2725 cp->provider->name); 2726 return (error); 2727 } 2728 2729 return (0); 2730} 2731 2732static int 2733g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp, 2734 struct g_mirror_metadata *md) 2735{ 2736 2737 if (g_mirror_id2disk(sc, md->md_did) != NULL) { 2738 G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.", 2739 pp->name, md->md_did); 2740 return (EEXIST); 2741 } 2742 if (md->md_all != sc->sc_ndisks) { 2743 G_MIRROR_DEBUG(1, 2744 "Invalid '%s' field on disk %s (device %s), skipping.", 2745 "md_all", pp->name, sc->sc_name); 2746 return (EINVAL); 2747 } 2748 if (md->md_slice != sc->sc_slice) { 2749 G_MIRROR_DEBUG(1, 2750 "Invalid '%s' field on disk %s (device %s), skipping.", 2751 "md_slice", pp->name, sc->sc_name); 2752 return (EINVAL); 2753 } 2754 if (md->md_balance != sc->sc_balance) { 2755 G_MIRROR_DEBUG(1, 2756 "Invalid '%s' field on disk %s (device %s), skipping.", 2757 "md_balance", pp->name, sc->sc_name); 2758 return (EINVAL); 2759 } 2760#if 0 2761 if (md->md_mediasize != sc->sc_mediasize) { 2762 G_MIRROR_DEBUG(1, 2763 "Invalid '%s' field on disk %s (device %s), skipping.", 2764 "md_mediasize", pp->name, sc->sc_name); 2765 return (EINVAL); 2766 } 2767#endif 2768 if (sc->sc_mediasize > pp->mediasize) { 2769 G_MIRROR_DEBUG(1, 2770 "Invalid size of disk %s (device %s), skipping.", pp->name, 2771 sc->sc_name); 2772 return (EINVAL); 2773 } 2774 if (md->md_sectorsize != sc->sc_sectorsize) { 2775 G_MIRROR_DEBUG(1, 2776 "Invalid '%s' field on disk %s (device %s), skipping.", 2777 "md_sectorsize", pp->name, sc->sc_name); 2778 return (EINVAL); 2779 } 2780 if ((sc->sc_sectorsize % pp->sectorsize) != 0) { 2781 G_MIRROR_DEBUG(1, 2782 "Invalid sector size of disk %s (device %s), skipping.", 2783 pp->name, sc->sc_name); 2784 return (EINVAL); 2785 } 2786 if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) { 2787 G_MIRROR_DEBUG(1, 2788 "Invalid device flags on disk %s (device %s), skipping.", 2789 pp->name, sc->sc_name); 2790 return (EINVAL); 2791 } 2792 if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) { 2793 G_MIRROR_DEBUG(1, 2794 "Invalid disk flags on disk %s (device %s), skipping.", 2795 pp->name, sc->sc_name); 2796 return (EINVAL); 2797 } 2798 return (0); 2799} 2800 2801int 2802g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp, 2803 struct g_mirror_metadata *md) 2804{ 2805 struct g_mirror_disk *disk; 2806 int error; 2807 2808 g_topology_assert_not(); 2809 G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name); 2810 2811 error = g_mirror_check_metadata(sc, pp, md); 2812 if (error != 0) 2813 return (error); 2814 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING && 2815 md->md_genid < sc->sc_genid) { 2816 G_MIRROR_DEBUG(0, "Component %s (device %s) broken, skipping.", 2817 pp->name, sc->sc_name); 2818 return (EINVAL); 2819 } 2820 disk = g_mirror_init_disk(sc, pp, md, &error); 2821 if (disk == NULL) 2822 return (error); 2823 error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW, 2824 G_MIRROR_EVENT_WAIT); 2825 if (error != 0) 2826 return (error); 2827 if (md->md_version < G_MIRROR_VERSION) { 2828 G_MIRROR_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).", 2829 pp->name, md->md_version, G_MIRROR_VERSION); 2830 g_mirror_update_metadata(disk); 2831 } 2832 return (0); 2833} 2834 2835static void 2836g_mirror_destroy_delayed(void *arg, int flag) 2837{ 2838 struct g_mirror_softc *sc; 2839 int error; 2840 2841 if (flag == EV_CANCEL) { 2842 G_MIRROR_DEBUG(1, "Destroying canceled."); 2843 return; 2844 } 2845 sc = arg; 2846 g_topology_unlock(); 2847 sx_xlock(&sc->sc_lock); 2848 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) == 0, 2849 ("DESTROY flag set on %s.", sc->sc_name)); 2850 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0, 2851 ("DESTROYING flag not set on %s.", sc->sc_name)); 2852 G_MIRROR_DEBUG(1, "Destroying %s (delayed).", sc->sc_name); 2853 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_SOFT); 2854 if (error != 0) { 2855 G_MIRROR_DEBUG(0, "Cannot destroy %s (error=%d).", 2856 sc->sc_name, error); 2857 sx_xunlock(&sc->sc_lock); 2858 } 2859 g_topology_lock(); 2860} 2861 2862static int 2863g_mirror_access(struct g_provider *pp, int acr, int acw, int ace) 2864{ 2865 struct g_mirror_softc *sc; 2866 int dcr, dcw, dce, error = 0; 2867 2868 g_topology_assert(); 2869 G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr, 2870 acw, ace); 2871 2872 sc = pp->geom->softc; 2873 if (sc == NULL && acr <= 0 && acw <= 0 && ace <= 0) 2874 return (0); 2875 KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name)); 2876 2877 dcr = pp->acr + acr; 2878 dcw = pp->acw + acw; 2879 dce = pp->ace + ace; 2880 2881 g_topology_unlock(); 2882 sx_xlock(&sc->sc_lock); 2883 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0 || 2884 LIST_EMPTY(&sc->sc_disks)) { 2885 if (acr > 0 || acw > 0 || ace > 0) 2886 error = ENXIO; 2887 goto end; 2888 } 2889 if (dcw == 0) 2890 g_mirror_idle(sc, dcw); 2891 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0) { 2892 if (acr > 0 || acw > 0 || ace > 0) { 2893 error = ENXIO; 2894 goto end; 2895 } 2896 if (dcr == 0 && dcw == 0 && dce == 0) { 2897 g_post_event(g_mirror_destroy_delayed, sc, M_WAITOK, 2898 sc, NULL); 2899 } 2900 } 2901end: 2902 sx_xunlock(&sc->sc_lock); 2903 g_topology_lock(); 2904 return (error); 2905} 2906 2907static struct g_geom * 2908g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md) 2909{ 2910 struct g_mirror_softc *sc; 2911 struct g_geom *gp; 2912 int error, timeout; 2913 2914 g_topology_assert(); 2915 G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name, 2916 md->md_mid); 2917 2918 /* One disk is minimum. */ 2919 if (md->md_all < 1) 2920 return (NULL); 2921 /* 2922 * Action geom. 2923 */ 2924 gp = g_new_geomf(mp, "%s", md->md_name); 2925 sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO); 2926 gp->start = g_mirror_start; 2927 gp->orphan = g_mirror_orphan; 2928 gp->access = g_mirror_access; 2929 gp->dumpconf = g_mirror_dumpconf; 2930 2931 sc->sc_id = md->md_mid; 2932 sc->sc_slice = md->md_slice; 2933 sc->sc_balance = md->md_balance; 2934 sc->sc_mediasize = md->md_mediasize; 2935 sc->sc_sectorsize = md->md_sectorsize; 2936 sc->sc_ndisks = md->md_all; 2937 sc->sc_flags = md->md_mflags; 2938 sc->sc_bump_id = 0; 2939 sc->sc_idle = 1; 2940 sc->sc_last_write = time_uptime; 2941 sc->sc_writes = 0; 2942 sx_init(&sc->sc_lock, "gmirror:lock"); 2943 bioq_init(&sc->sc_queue); 2944 mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF); 2945 bioq_init(&sc->sc_regular_delayed); 2946 bioq_init(&sc->sc_inflight); 2947 bioq_init(&sc->sc_sync_delayed); 2948 LIST_INIT(&sc->sc_disks); 2949 TAILQ_INIT(&sc->sc_events); 2950 mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF); 2951 callout_init(&sc->sc_callout, 1); 2952 mtx_init(&sc->sc_done_mtx, "gmirror:done", NULL, MTX_DEF); 2953 sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING; 2954 gp->softc = sc; 2955 sc->sc_geom = gp; 2956 sc->sc_provider = NULL; 2957 /* 2958 * Synchronization geom. 2959 */ 2960 gp = g_new_geomf(mp, "%s.sync", md->md_name); 2961 gp->softc = sc; 2962 gp->orphan = g_mirror_orphan; 2963 sc->sc_sync.ds_geom = gp; 2964 sc->sc_sync.ds_ndisks = 0; 2965 error = kproc_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0, 2966 "g_mirror %s", md->md_name); 2967 if (error != 0) { 2968 G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.", 2969 sc->sc_name); 2970 g_destroy_geom(sc->sc_sync.ds_geom); 2971 mtx_destroy(&sc->sc_done_mtx); 2972 mtx_destroy(&sc->sc_events_mtx); 2973 mtx_destroy(&sc->sc_queue_mtx); 2974 sx_destroy(&sc->sc_lock); 2975 g_destroy_geom(sc->sc_geom); 2976 free(sc, M_MIRROR); 2977 return (NULL); 2978 } 2979 2980 G_MIRROR_DEBUG(1, "Device %s created (%u components, id=%u).", 2981 sc->sc_name, sc->sc_ndisks, sc->sc_id); 2982 2983 sc->sc_rootmount = root_mount_hold("GMIRROR"); 2984 G_MIRROR_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount); 2985 /* 2986 * Run timeout. 2987 */ 2988 timeout = g_mirror_timeout * hz; 2989 callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc); 2990 return (sc->sc_geom); 2991} 2992 2993int 2994g_mirror_destroy(struct g_mirror_softc *sc, int how) 2995{ 2996 struct g_mirror_disk *disk; 2997 struct g_provider *pp; 2998 2999 g_topology_assert_not(); 3000 if (sc == NULL) 3001 return (ENXIO); 3002 sx_assert(&sc->sc_lock, SX_XLOCKED); 3003 3004 pp = sc->sc_provider; 3005 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0 || 3006 SCHEDULER_STOPPED())) { 3007 switch (how) { 3008 case G_MIRROR_DESTROY_SOFT: 3009 G_MIRROR_DEBUG(1, 3010 "Device %s is still open (r%dw%de%d).", pp->name, 3011 pp->acr, pp->acw, pp->ace); 3012 return (EBUSY); 3013 case G_MIRROR_DESTROY_DELAYED: 3014 G_MIRROR_DEBUG(1, 3015 "Device %s will be destroyed on last close.", 3016 pp->name); 3017 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 3018 if (disk->d_state == 3019 G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3020 g_mirror_sync_stop(disk, 1); 3021 } 3022 } 3023 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROYING; 3024 return (EBUSY); 3025 case G_MIRROR_DESTROY_HARD: 3026 G_MIRROR_DEBUG(1, "Device %s is still open, so it " 3027 "can't be definitely removed.", pp->name); 3028 } 3029 } 3030 3031 g_topology_lock(); 3032 if (sc->sc_geom->softc == NULL) { 3033 g_topology_unlock(); 3034 return (0); 3035 } 3036 sc->sc_geom->softc = NULL; 3037 sc->sc_sync.ds_geom->softc = NULL; 3038 g_topology_unlock(); 3039 3040 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 3041 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_WAIT; 3042 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 3043 sx_xunlock(&sc->sc_lock); 3044 mtx_lock(&sc->sc_queue_mtx); 3045 wakeup(sc); 3046 mtx_unlock(&sc->sc_queue_mtx); 3047 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker); 3048 while (sc->sc_worker != NULL) 3049 tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5); 3050 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker); 3051 sx_xlock(&sc->sc_lock); 3052 g_mirror_destroy_device(sc); 3053 free(sc, M_MIRROR); 3054 return (0); 3055} 3056 3057static void 3058g_mirror_taste_orphan(struct g_consumer *cp) 3059{ 3060 3061 KASSERT(1 == 0, ("%s called while tasting %s.", __func__, 3062 cp->provider->name)); 3063} 3064 3065static struct g_geom * 3066g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 3067{ 3068 struct g_mirror_metadata md; 3069 struct g_mirror_softc *sc; 3070 struct g_consumer *cp; 3071 struct g_geom *gp; 3072 int error; 3073 3074 g_topology_assert(); 3075 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 3076 G_MIRROR_DEBUG(2, "Tasting %s.", pp->name); 3077 3078 gp = g_new_geomf(mp, "mirror:taste"); 3079 /* 3080 * This orphan function should be never called. 3081 */ 3082 gp->orphan = g_mirror_taste_orphan; 3083 cp = g_new_consumer(gp); 3084 g_attach(cp, pp); 3085 error = g_mirror_read_metadata(cp, &md); 3086 g_detach(cp); 3087 g_destroy_consumer(cp); 3088 g_destroy_geom(gp); 3089 if (error != 0) 3090 return (NULL); 3091 gp = NULL; 3092 3093 if (md.md_provider[0] != '\0' && 3094 !g_compare_names(md.md_provider, pp->name)) 3095 return (NULL); 3096 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize) 3097 return (NULL); 3098 if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) { 3099 G_MIRROR_DEBUG(0, 3100 "Device %s: provider %s marked as inactive, skipping.", 3101 md.md_name, pp->name); 3102 return (NULL); 3103 } 3104 if (g_mirror_debug >= 2) 3105 mirror_metadata_dump(&md); 3106 3107 /* 3108 * Let's check if device already exists. 3109 */ 3110 sc = NULL; 3111 LIST_FOREACH(gp, &mp->geom, geom) { 3112 sc = gp->softc; 3113 if (sc == NULL) 3114 continue; 3115 if (sc->sc_sync.ds_geom == gp) 3116 continue; 3117 if (strcmp(md.md_name, sc->sc_name) != 0) 3118 continue; 3119 if (md.md_mid != sc->sc_id) { 3120 G_MIRROR_DEBUG(0, "Device %s already configured.", 3121 sc->sc_name); 3122 return (NULL); 3123 } 3124 break; 3125 } 3126 if (gp == NULL) { 3127 gp = g_mirror_create(mp, &md); 3128 if (gp == NULL) { 3129 G_MIRROR_DEBUG(0, "Cannot create device %s.", 3130 md.md_name); 3131 return (NULL); 3132 } 3133 sc = gp->softc; 3134 } 3135 G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name); 3136 g_topology_unlock(); 3137 sx_xlock(&sc->sc_lock); 3138 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_TASTING; 3139 error = g_mirror_add_disk(sc, pp, &md); 3140 if (error != 0) { 3141 G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).", 3142 pp->name, gp->name, error); 3143 if (LIST_EMPTY(&sc->sc_disks)) { 3144 g_cancel_event(sc); 3145 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3146 g_topology_lock(); 3147 return (NULL); 3148 } 3149 gp = NULL; 3150 } 3151 sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_TASTING; 3152 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 3153 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3154 g_topology_lock(); 3155 return (NULL); 3156 } 3157 sx_xunlock(&sc->sc_lock); 3158 g_topology_lock(); 3159 return (gp); 3160} 3161 3162static void 3163g_mirror_resize(struct g_consumer *cp) 3164{ 3165 struct g_mirror_disk *disk; 3166 3167 g_topology_assert(); 3168 g_trace(G_T_TOPOLOGY, "%s(%s)", __func__, cp->provider->name); 3169 3170 disk = cp->private; 3171 if (disk == NULL) 3172 return; 3173 g_topology_unlock(); 3174 g_mirror_update_metadata(disk); 3175 g_topology_lock(); 3176} 3177 3178static int 3179g_mirror_destroy_geom(struct gctl_req *req __unused, 3180 struct g_class *mp __unused, struct g_geom *gp) 3181{ 3182 struct g_mirror_softc *sc; 3183 int error; 3184 3185 g_topology_unlock(); 3186 sc = gp->softc; 3187 sx_xlock(&sc->sc_lock); 3188 g_cancel_event(sc); 3189 error = g_mirror_destroy(gp->softc, G_MIRROR_DESTROY_SOFT); 3190 if (error != 0) 3191 sx_xunlock(&sc->sc_lock); 3192 g_topology_lock(); 3193 return (error); 3194} 3195 3196static void 3197g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 3198 struct g_consumer *cp, struct g_provider *pp) 3199{ 3200 struct g_mirror_softc *sc; 3201 3202 g_topology_assert(); 3203 3204 sc = gp->softc; 3205 if (sc == NULL) 3206 return; 3207 /* Skip synchronization geom. */ 3208 if (gp == sc->sc_sync.ds_geom) 3209 return; 3210 if (pp != NULL) { 3211 /* Nothing here. */ 3212 } else if (cp != NULL) { 3213 struct g_mirror_disk *disk; 3214 3215 disk = cp->private; 3216 if (disk == NULL) 3217 return; 3218 g_topology_unlock(); 3219 sx_xlock(&sc->sc_lock); 3220 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id); 3221 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3222 sbuf_printf(sb, "%s<Synchronized>", indent); 3223 if (disk->d_sync.ds_offset == 0) 3224 sbuf_printf(sb, "0%%"); 3225 else { 3226 sbuf_printf(sb, "%u%%", 3227 (u_int)((disk->d_sync.ds_offset * 100) / 3228 sc->sc_provider->mediasize)); 3229 } 3230 sbuf_printf(sb, "</Synchronized>\n"); 3231 if (disk->d_sync.ds_offset > 0) { 3232 sbuf_printf(sb, "%s<BytesSynced>%jd" 3233 "</BytesSynced>\n", indent, 3234 (intmax_t)disk->d_sync.ds_offset); 3235 } 3236 } 3237 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, 3238 disk->d_sync.ds_syncid); 3239 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, 3240 disk->d_genid); 3241 sbuf_printf(sb, "%s<Flags>", indent); 3242 if (disk->d_flags == 0) 3243 sbuf_printf(sb, "NONE"); 3244 else { 3245 int first = 1; 3246 3247#define ADD_FLAG(flag, name) do { \ 3248 if ((disk->d_flags & (flag)) != 0) { \ 3249 if (!first) \ 3250 sbuf_printf(sb, ", "); \ 3251 else \ 3252 first = 0; \ 3253 sbuf_printf(sb, name); \ 3254 } \ 3255} while (0) 3256 ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY"); 3257 ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED"); 3258 ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE"); 3259 ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING, 3260 "SYNCHRONIZING"); 3261 ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC"); 3262 ADD_FLAG(G_MIRROR_DISK_FLAG_BROKEN, "BROKEN"); 3263#undef ADD_FLAG 3264 } 3265 sbuf_printf(sb, "</Flags>\n"); 3266 sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent, 3267 disk->d_priority); 3268 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 3269 g_mirror_disk_state2str(disk->d_state)); 3270 sx_xunlock(&sc->sc_lock); 3271 g_topology_lock(); 3272 } else { 3273 g_topology_unlock(); 3274 sx_xlock(&sc->sc_lock); 3275 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id); 3276 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid); 3277 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid); 3278 sbuf_printf(sb, "%s<Flags>", indent); 3279 if (sc->sc_flags == 0) 3280 sbuf_printf(sb, "NONE"); 3281 else { 3282 int first = 1; 3283 3284#define ADD_FLAG(flag, name) do { \ 3285 if ((sc->sc_flags & (flag)) != 0) { \ 3286 if (!first) \ 3287 sbuf_printf(sb, ", "); \ 3288 else \ 3289 first = 0; \ 3290 sbuf_printf(sb, name); \ 3291 } \ 3292} while (0) 3293 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC"); 3294 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC"); 3295#undef ADD_FLAG 3296 } 3297 sbuf_printf(sb, "</Flags>\n"); 3298 sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent, 3299 (u_int)sc->sc_slice); 3300 sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent, 3301 balance_name(sc->sc_balance)); 3302 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent, 3303 sc->sc_ndisks); 3304 sbuf_printf(sb, "%s<State>", indent); 3305 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 3306 sbuf_printf(sb, "%s", "STARTING"); 3307 else if (sc->sc_ndisks == 3308 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE)) 3309 sbuf_printf(sb, "%s", "COMPLETE"); 3310 else 3311 sbuf_printf(sb, "%s", "DEGRADED"); 3312 sbuf_printf(sb, "</State>\n"); 3313 sx_xunlock(&sc->sc_lock); 3314 g_topology_lock(); 3315 } 3316} 3317 3318static void 3319g_mirror_shutdown_post_sync(void *arg, int howto) 3320{ 3321 struct g_class *mp; 3322 struct g_geom *gp, *gp2; 3323 struct g_mirror_softc *sc; 3324 int error; 3325 3326 mp = arg; 3327 g_topology_lock(); 3328 g_mirror_shutdown = 1; 3329 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 3330 if ((sc = gp->softc) == NULL) 3331 continue; 3332 /* Skip synchronization geom. */ 3333 if (gp == sc->sc_sync.ds_geom) 3334 continue; 3335 g_topology_unlock(); 3336 sx_xlock(&sc->sc_lock); 3337 g_mirror_idle(sc, -1); 3338 g_cancel_event(sc); 3339 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_DELAYED); 3340 if (error != 0) 3341 sx_xunlock(&sc->sc_lock); 3342 g_topology_lock(); 3343 } 3344 g_topology_unlock(); 3345} 3346 3347static void 3348g_mirror_init(struct g_class *mp) 3349{ 3350 3351 g_mirror_post_sync = EVENTHANDLER_REGISTER(shutdown_post_sync, 3352 g_mirror_shutdown_post_sync, mp, SHUTDOWN_PRI_FIRST); 3353 if (g_mirror_post_sync == NULL) 3354 G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event."); 3355} 3356 3357static void 3358g_mirror_fini(struct g_class *mp) 3359{ 3360 3361 if (g_mirror_post_sync != NULL) 3362 EVENTHANDLER_DEREGISTER(shutdown_post_sync, g_mirror_post_sync); 3363} 3364 3365DECLARE_GEOM_CLASS(g_mirror_class, g_mirror); 3366