g_mirror.c revision 201566
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: head/sys/geom/mirror/g_mirror.c 201566 2010-01-05 10:30:56Z mav $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/kernel.h> 33#include <sys/module.h> 34#include <sys/limits.h> 35#include <sys/lock.h> 36#include <sys/mutex.h> 37#include <sys/bio.h> 38#include <sys/sysctl.h> 39#include <sys/malloc.h> 40#include <sys/eventhandler.h> 41#include <vm/uma.h> 42#include <geom/geom.h> 43#include <sys/proc.h> 44#include <sys/kthread.h> 45#include <sys/sched.h> 46#include <geom/mirror/g_mirror.h> 47 48 49static MALLOC_DEFINE(M_MIRROR, "mirror_data", "GEOM_MIRROR Data"); 50 51SYSCTL_DECL(_kern_geom); 52SYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW, 0, "GEOM_MIRROR stuff"); 53u_int g_mirror_debug = 0; 54TUNABLE_INT("kern.geom.mirror.debug", &g_mirror_debug); 55SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RW, &g_mirror_debug, 0, 56 "Debug level"); 57static u_int g_mirror_timeout = 4; 58TUNABLE_INT("kern.geom.mirror.timeout", &g_mirror_timeout); 59SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RW, &g_mirror_timeout, 60 0, "Time to wait on all mirror components"); 61static u_int g_mirror_idletime = 5; 62TUNABLE_INT("kern.geom.mirror.idletime", &g_mirror_idletime); 63SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, idletime, CTLFLAG_RW, 64 &g_mirror_idletime, 0, "Mark components as clean when idling"); 65static u_int g_mirror_disconnect_on_failure = 1; 66TUNABLE_INT("kern.geom.mirror.disconnect_on_failure", 67 &g_mirror_disconnect_on_failure); 68SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, disconnect_on_failure, CTLFLAG_RW, 69 &g_mirror_disconnect_on_failure, 0, "Disconnect component on I/O failure."); 70static u_int g_mirror_syncreqs = 2; 71TUNABLE_INT("kern.geom.mirror.sync_requests", &g_mirror_syncreqs); 72SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_requests, CTLFLAG_RDTUN, 73 &g_mirror_syncreqs, 0, "Parallel synchronization I/O requests."); 74 75#define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \ 76 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \ 77 msleep((ident), (mtx), (priority), (wmesg), (timeout)); \ 78 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \ 79} while (0) 80 81static eventhandler_tag g_mirror_pre_sync = NULL; 82 83static int g_mirror_destroy_geom(struct gctl_req *req, struct g_class *mp, 84 struct g_geom *gp); 85static g_taste_t g_mirror_taste; 86static void g_mirror_init(struct g_class *mp); 87static void g_mirror_fini(struct g_class *mp); 88 89struct g_class g_mirror_class = { 90 .name = G_MIRROR_CLASS_NAME, 91 .version = G_VERSION, 92 .ctlreq = g_mirror_config, 93 .taste = g_mirror_taste, 94 .destroy_geom = g_mirror_destroy_geom, 95 .init = g_mirror_init, 96 .fini = g_mirror_fini 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 error = g_attach(cp, pp); 394 if (error != 0) { 395 g_destroy_consumer(cp); 396 g_topology_unlock(); 397 return (error); 398 } 399 error = g_access(cp, 1, 1, 1); 400 if (error != 0) { 401 g_detach(cp); 402 g_destroy_consumer(cp); 403 g_topology_unlock(); 404 G_MIRROR_DEBUG(0, "Cannot open consumer %s (error=%d).", 405 pp->name, error); 406 return (error); 407 } 408 g_topology_unlock(); 409 disk->d_consumer = cp; 410 disk->d_consumer->private = disk; 411 disk->d_consumer->index = 0; 412 413 G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk)); 414 return (0); 415} 416 417static void 418g_mirror_disconnect_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 419{ 420 421 g_topology_assert(); 422 423 if (cp == NULL) 424 return; 425 if (cp->provider != NULL) 426 g_mirror_kill_consumer(sc, cp); 427 else 428 g_destroy_consumer(cp); 429} 430 431/* 432 * Initialize disk. This means allocate memory, create consumer, attach it 433 * to the provider and open access (r1w1e1) to it. 434 */ 435static struct g_mirror_disk * 436g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp, 437 struct g_mirror_metadata *md, int *errorp) 438{ 439 struct g_mirror_disk *disk; 440 int error; 441 442 disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO); 443 if (disk == NULL) { 444 error = ENOMEM; 445 goto fail; 446 } 447 disk->d_softc = sc; 448 error = g_mirror_connect_disk(disk, pp); 449 if (error != 0) 450 goto fail; 451 disk->d_id = md->md_did; 452 disk->d_state = G_MIRROR_DISK_STATE_NONE; 453 disk->d_priority = md->md_priority; 454 disk->d_flags = md->md_dflags; 455 if (md->md_provider[0] != '\0') 456 disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED; 457 disk->d_sync.ds_consumer = NULL; 458 disk->d_sync.ds_offset = md->md_sync_offset; 459 disk->d_sync.ds_offset_done = md->md_sync_offset; 460 disk->d_genid = md->md_genid; 461 disk->d_sync.ds_syncid = md->md_syncid; 462 if (errorp != NULL) 463 *errorp = 0; 464 return (disk); 465fail: 466 if (errorp != NULL) 467 *errorp = error; 468 if (disk != NULL) 469 free(disk, M_MIRROR); 470 return (NULL); 471} 472 473static void 474g_mirror_destroy_disk(struct g_mirror_disk *disk) 475{ 476 struct g_mirror_softc *sc; 477 478 g_topology_assert_not(); 479 sc = disk->d_softc; 480 sx_assert(&sc->sc_lock, SX_XLOCKED); 481 482 LIST_REMOVE(disk, d_next); 483 g_mirror_event_cancel(disk); 484 if (sc->sc_hint == disk) 485 sc->sc_hint = NULL; 486 switch (disk->d_state) { 487 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 488 g_mirror_sync_stop(disk, 1); 489 /* FALLTHROUGH */ 490 case G_MIRROR_DISK_STATE_NEW: 491 case G_MIRROR_DISK_STATE_STALE: 492 case G_MIRROR_DISK_STATE_ACTIVE: 493 g_topology_lock(); 494 g_mirror_disconnect_consumer(sc, disk->d_consumer); 495 g_topology_unlock(); 496 free(disk, M_MIRROR); 497 break; 498 default: 499 KASSERT(0 == 1, ("Wrong disk state (%s, %s).", 500 g_mirror_get_diskname(disk), 501 g_mirror_disk_state2str(disk->d_state))); 502 } 503} 504 505static void 506g_mirror_destroy_device(struct g_mirror_softc *sc) 507{ 508 struct g_mirror_disk *disk; 509 struct g_mirror_event *ep; 510 struct g_geom *gp; 511 struct g_consumer *cp, *tmpcp; 512 513 g_topology_assert_not(); 514 sx_assert(&sc->sc_lock, SX_XLOCKED); 515 516 gp = sc->sc_geom; 517 if (sc->sc_provider != NULL) 518 g_mirror_destroy_provider(sc); 519 for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL; 520 disk = LIST_FIRST(&sc->sc_disks)) { 521 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 522 g_mirror_update_metadata(disk); 523 g_mirror_destroy_disk(disk); 524 } 525 while ((ep = g_mirror_event_get(sc)) != NULL) { 526 g_mirror_event_remove(sc, ep); 527 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 528 g_mirror_event_free(ep); 529 else { 530 ep->e_error = ECANCELED; 531 ep->e_flags |= G_MIRROR_EVENT_DONE; 532 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep); 533 mtx_lock(&sc->sc_events_mtx); 534 wakeup(ep); 535 mtx_unlock(&sc->sc_events_mtx); 536 } 537 } 538 callout_drain(&sc->sc_callout); 539 540 g_topology_lock(); 541 LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) { 542 g_mirror_disconnect_consumer(sc, cp); 543 } 544 g_wither_geom(sc->sc_sync.ds_geom, ENXIO); 545 G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name); 546 g_wither_geom(gp, ENXIO); 547 g_topology_unlock(); 548 mtx_destroy(&sc->sc_queue_mtx); 549 mtx_destroy(&sc->sc_events_mtx); 550 sx_xunlock(&sc->sc_lock); 551 sx_destroy(&sc->sc_lock); 552} 553 554static void 555g_mirror_orphan(struct g_consumer *cp) 556{ 557 struct g_mirror_disk *disk; 558 559 g_topology_assert(); 560 561 disk = cp->private; 562 if (disk == NULL) 563 return; 564 disk->d_softc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 565 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 566 G_MIRROR_EVENT_DONTWAIT); 567} 568 569/* 570 * Function should return the next active disk on the list. 571 * It is possible that it will be the same disk as given. 572 * If there are no active disks on list, NULL is returned. 573 */ 574static __inline struct g_mirror_disk * 575g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 576{ 577 struct g_mirror_disk *dp; 578 579 for (dp = LIST_NEXT(disk, d_next); dp != disk; 580 dp = LIST_NEXT(dp, d_next)) { 581 if (dp == NULL) 582 dp = LIST_FIRST(&sc->sc_disks); 583 if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE) 584 break; 585 } 586 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 587 return (NULL); 588 return (dp); 589} 590 591static struct g_mirror_disk * 592g_mirror_get_disk(struct g_mirror_softc *sc) 593{ 594 struct g_mirror_disk *disk; 595 596 if (sc->sc_hint == NULL) { 597 sc->sc_hint = LIST_FIRST(&sc->sc_disks); 598 if (sc->sc_hint == NULL) 599 return (NULL); 600 } 601 disk = sc->sc_hint; 602 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) { 603 disk = g_mirror_find_next(sc, disk); 604 if (disk == NULL) 605 return (NULL); 606 } 607 sc->sc_hint = g_mirror_find_next(sc, disk); 608 return (disk); 609} 610 611static int 612g_mirror_write_metadata(struct g_mirror_disk *disk, 613 struct g_mirror_metadata *md) 614{ 615 struct g_mirror_softc *sc; 616 struct g_consumer *cp; 617 off_t offset, length; 618 u_char *sector; 619 int error = 0; 620 621 g_topology_assert_not(); 622 sc = disk->d_softc; 623 sx_assert(&sc->sc_lock, SX_LOCKED); 624 625 cp = disk->d_consumer; 626 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name)); 627 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name)); 628 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 629 ("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr, 630 cp->acw, cp->ace)); 631 length = cp->provider->sectorsize; 632 offset = cp->provider->mediasize - length; 633 sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO); 634 if (md != NULL) 635 mirror_metadata_encode(md, sector); 636 error = g_write_data(cp, offset, sector, length); 637 free(sector, M_MIRROR); 638 if (error != 0) { 639 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 640 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 641 G_MIRROR_DEBUG(0, "Cannot write metadata on %s " 642 "(device=%s, error=%d).", 643 g_mirror_get_diskname(disk), sc->sc_name, error); 644 } else { 645 G_MIRROR_DEBUG(1, "Cannot write metadata on %s " 646 "(device=%s, error=%d).", 647 g_mirror_get_diskname(disk), sc->sc_name, error); 648 } 649 if (g_mirror_disconnect_on_failure && 650 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) { 651 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 652 g_mirror_event_send(disk, 653 G_MIRROR_DISK_STATE_DISCONNECTED, 654 G_MIRROR_EVENT_DONTWAIT); 655 } 656 } 657 return (error); 658} 659 660static int 661g_mirror_clear_metadata(struct g_mirror_disk *disk) 662{ 663 int error; 664 665 g_topology_assert_not(); 666 sx_assert(&disk->d_softc->sc_lock, SX_LOCKED); 667 668 error = g_mirror_write_metadata(disk, NULL); 669 if (error == 0) { 670 G_MIRROR_DEBUG(2, "Metadata on %s cleared.", 671 g_mirror_get_diskname(disk)); 672 } else { 673 G_MIRROR_DEBUG(0, 674 "Cannot clear metadata on disk %s (error=%d).", 675 g_mirror_get_diskname(disk), error); 676 } 677 return (error); 678} 679 680void 681g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk, 682 struct g_mirror_metadata *md) 683{ 684 685 strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic)); 686 md->md_version = G_MIRROR_VERSION; 687 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name)); 688 md->md_mid = sc->sc_id; 689 md->md_all = sc->sc_ndisks; 690 md->md_slice = sc->sc_slice; 691 md->md_balance = sc->sc_balance; 692 md->md_genid = sc->sc_genid; 693 md->md_mediasize = sc->sc_mediasize; 694 md->md_sectorsize = sc->sc_sectorsize; 695 md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK); 696 bzero(md->md_provider, sizeof(md->md_provider)); 697 if (disk == NULL) { 698 md->md_did = arc4random(); 699 md->md_priority = 0; 700 md->md_syncid = 0; 701 md->md_dflags = 0; 702 md->md_sync_offset = 0; 703 md->md_provsize = 0; 704 } else { 705 md->md_did = disk->d_id; 706 md->md_priority = disk->d_priority; 707 md->md_syncid = disk->d_sync.ds_syncid; 708 md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK); 709 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 710 md->md_sync_offset = disk->d_sync.ds_offset_done; 711 else 712 md->md_sync_offset = 0; 713 if ((disk->d_flags & G_MIRROR_DISK_FLAG_HARDCODED) != 0) { 714 strlcpy(md->md_provider, 715 disk->d_consumer->provider->name, 716 sizeof(md->md_provider)); 717 } 718 md->md_provsize = disk->d_consumer->provider->mediasize; 719 } 720} 721 722void 723g_mirror_update_metadata(struct g_mirror_disk *disk) 724{ 725 struct g_mirror_softc *sc; 726 struct g_mirror_metadata md; 727 int error; 728 729 g_topology_assert_not(); 730 sc = disk->d_softc; 731 sx_assert(&sc->sc_lock, SX_LOCKED); 732 733 g_mirror_fill_metadata(sc, disk, &md); 734 error = g_mirror_write_metadata(disk, &md); 735 if (error == 0) { 736 G_MIRROR_DEBUG(2, "Metadata on %s updated.", 737 g_mirror_get_diskname(disk)); 738 } else { 739 G_MIRROR_DEBUG(0, 740 "Cannot update metadata on disk %s (error=%d).", 741 g_mirror_get_diskname(disk), error); 742 } 743} 744 745static void 746g_mirror_bump_syncid(struct g_mirror_softc *sc) 747{ 748 struct g_mirror_disk *disk; 749 750 g_topology_assert_not(); 751 sx_assert(&sc->sc_lock, SX_XLOCKED); 752 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 753 ("%s called with no active disks (device=%s).", __func__, 754 sc->sc_name)); 755 756 sc->sc_syncid++; 757 G_MIRROR_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name, 758 sc->sc_syncid); 759 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 760 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 761 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 762 disk->d_sync.ds_syncid = sc->sc_syncid; 763 g_mirror_update_metadata(disk); 764 } 765 } 766} 767 768static void 769g_mirror_bump_genid(struct g_mirror_softc *sc) 770{ 771 struct g_mirror_disk *disk; 772 773 g_topology_assert_not(); 774 sx_assert(&sc->sc_lock, SX_XLOCKED); 775 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 776 ("%s called with no active disks (device=%s).", __func__, 777 sc->sc_name)); 778 779 sc->sc_genid++; 780 G_MIRROR_DEBUG(1, "Device %s: genid bumped to %u.", sc->sc_name, 781 sc->sc_genid); 782 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 783 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 784 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 785 disk->d_genid = sc->sc_genid; 786 g_mirror_update_metadata(disk); 787 } 788 } 789} 790 791static int 792g_mirror_idle(struct g_mirror_softc *sc, int acw) 793{ 794 struct g_mirror_disk *disk; 795 int timeout; 796 797 g_topology_assert_not(); 798 sx_assert(&sc->sc_lock, SX_XLOCKED); 799 800 if (sc->sc_provider == NULL) 801 return (0); 802 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 803 return (0); 804 if (sc->sc_idle) 805 return (0); 806 if (sc->sc_writes > 0) 807 return (0); 808 if (acw > 0 || (acw == -1 && sc->sc_provider->acw > 0)) { 809 timeout = g_mirror_idletime - (time_uptime - sc->sc_last_write); 810 if (timeout > 0) 811 return (timeout); 812 } 813 sc->sc_idle = 1; 814 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 815 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 816 continue; 817 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.", 818 g_mirror_get_diskname(disk), sc->sc_name); 819 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 820 g_mirror_update_metadata(disk); 821 } 822 return (0); 823} 824 825static void 826g_mirror_unidle(struct g_mirror_softc *sc) 827{ 828 struct g_mirror_disk *disk; 829 830 g_topology_assert_not(); 831 sx_assert(&sc->sc_lock, SX_XLOCKED); 832 833 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 834 return; 835 sc->sc_idle = 0; 836 sc->sc_last_write = time_uptime; 837 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 838 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 839 continue; 840 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.", 841 g_mirror_get_diskname(disk), sc->sc_name); 842 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 843 g_mirror_update_metadata(disk); 844 } 845} 846 847static __inline int 848bintime_cmp(struct bintime *bt1, struct bintime *bt2) 849{ 850 851 if (bt1->sec < bt2->sec) 852 return (-1); 853 else if (bt1->sec > bt2->sec) 854 return (1); 855 if (bt1->frac < bt2->frac) 856 return (-1); 857 else if (bt1->frac > bt2->frac) 858 return (1); 859 return (0); 860} 861 862static void 863g_mirror_done(struct bio *bp) 864{ 865 struct g_mirror_softc *sc; 866 867 sc = bp->bio_from->geom->softc; 868 bp->bio_cflags = G_MIRROR_BIO_FLAG_REGULAR; 869 mtx_lock(&sc->sc_queue_mtx); 870 bioq_disksort(&sc->sc_queue, bp); 871 mtx_unlock(&sc->sc_queue_mtx); 872 wakeup(sc); 873} 874 875static void 876g_mirror_regular_request(struct bio *bp) 877{ 878 struct g_mirror_softc *sc; 879 struct g_mirror_disk *disk; 880 struct bio *pbp; 881 882 g_topology_assert_not(); 883 884 pbp = bp->bio_parent; 885 sc = pbp->bio_to->geom->softc; 886 bp->bio_from->index--; 887 if (bp->bio_cmd == BIO_WRITE) 888 sc->sc_writes--; 889 disk = bp->bio_from->private; 890 if (disk == NULL) { 891 g_topology_lock(); 892 g_mirror_kill_consumer(sc, bp->bio_from); 893 g_topology_unlock(); 894 } 895 896 pbp->bio_inbed++; 897 KASSERT(pbp->bio_inbed <= pbp->bio_children, 898 ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed, 899 pbp->bio_children)); 900 if (bp->bio_error == 0 && pbp->bio_error == 0) { 901 G_MIRROR_LOGREQ(3, bp, "Request delivered."); 902 g_destroy_bio(bp); 903 if (pbp->bio_children == pbp->bio_inbed) { 904 G_MIRROR_LOGREQ(3, pbp, "Request delivered."); 905 pbp->bio_completed = pbp->bio_length; 906 if (pbp->bio_cmd == BIO_WRITE) { 907 bioq_remove(&sc->sc_inflight, pbp); 908 /* Release delayed sync requests if possible. */ 909 g_mirror_sync_release(sc); 910 } 911 g_io_deliver(pbp, pbp->bio_error); 912 } 913 return; 914 } else if (bp->bio_error != 0) { 915 if (pbp->bio_error == 0) 916 pbp->bio_error = bp->bio_error; 917 if (disk != NULL) { 918 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 919 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 920 G_MIRROR_LOGREQ(0, bp, 921 "Request failed (error=%d).", 922 bp->bio_error); 923 } else { 924 G_MIRROR_LOGREQ(1, bp, 925 "Request failed (error=%d).", 926 bp->bio_error); 927 } 928 if (g_mirror_disconnect_on_failure && 929 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) 930 { 931 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 932 g_mirror_event_send(disk, 933 G_MIRROR_DISK_STATE_DISCONNECTED, 934 G_MIRROR_EVENT_DONTWAIT); 935 } 936 } 937 switch (pbp->bio_cmd) { 938 case BIO_DELETE: 939 case BIO_WRITE: 940 pbp->bio_inbed--; 941 pbp->bio_children--; 942 break; 943 } 944 } 945 g_destroy_bio(bp); 946 947 switch (pbp->bio_cmd) { 948 case BIO_READ: 949 if (pbp->bio_inbed < pbp->bio_children) 950 break; 951 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 1) 952 g_io_deliver(pbp, pbp->bio_error); 953 else { 954 pbp->bio_error = 0; 955 mtx_lock(&sc->sc_queue_mtx); 956 bioq_disksort(&sc->sc_queue, pbp); 957 mtx_unlock(&sc->sc_queue_mtx); 958 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 959 wakeup(sc); 960 } 961 break; 962 case BIO_DELETE: 963 case BIO_WRITE: 964 if (pbp->bio_children == 0) { 965 /* 966 * All requests failed. 967 */ 968 } else if (pbp->bio_inbed < pbp->bio_children) { 969 /* Do nothing. */ 970 break; 971 } else if (pbp->bio_children == pbp->bio_inbed) { 972 /* Some requests succeeded. */ 973 pbp->bio_error = 0; 974 pbp->bio_completed = pbp->bio_length; 975 } 976 bioq_remove(&sc->sc_inflight, pbp); 977 /* Release delayed sync requests if possible. */ 978 g_mirror_sync_release(sc); 979 g_io_deliver(pbp, pbp->bio_error); 980 break; 981 default: 982 KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd)); 983 break; 984 } 985} 986 987static void 988g_mirror_sync_done(struct bio *bp) 989{ 990 struct g_mirror_softc *sc; 991 992 G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered."); 993 sc = bp->bio_from->geom->softc; 994 bp->bio_cflags = G_MIRROR_BIO_FLAG_SYNC; 995 mtx_lock(&sc->sc_queue_mtx); 996 bioq_disksort(&sc->sc_queue, bp); 997 mtx_unlock(&sc->sc_queue_mtx); 998 wakeup(sc); 999} 1000 1001static void 1002g_mirror_kernel_dump(struct bio *bp) 1003{ 1004 struct g_mirror_softc *sc; 1005 struct g_mirror_disk *disk; 1006 struct bio *cbp; 1007 struct g_kerneldump *gkd; 1008 1009 /* 1010 * We configure dumping to the first component, because this component 1011 * will be used for reading with 'prefer' balance algorithm. 1012 * If the component with the higest priority is currently disconnected 1013 * we will not be able to read the dump after the reboot if it will be 1014 * connected and synchronized later. Can we do something better? 1015 */ 1016 sc = bp->bio_to->geom->softc; 1017 disk = LIST_FIRST(&sc->sc_disks); 1018 1019 gkd = (struct g_kerneldump *)bp->bio_data; 1020 if (gkd->length > bp->bio_to->mediasize) 1021 gkd->length = bp->bio_to->mediasize; 1022 cbp = g_clone_bio(bp); 1023 if (cbp == NULL) { 1024 g_io_deliver(bp, ENOMEM); 1025 return; 1026 } 1027 cbp->bio_done = g_std_done; 1028 g_io_request(cbp, disk->d_consumer); 1029 G_MIRROR_DEBUG(1, "Kernel dump will go to %s.", 1030 g_mirror_get_diskname(disk)); 1031} 1032 1033static void 1034g_mirror_flush(struct g_mirror_softc *sc, struct bio *bp) 1035{ 1036 struct bio_queue_head queue; 1037 struct g_mirror_disk *disk; 1038 struct g_consumer *cp; 1039 struct bio *cbp; 1040 1041 bioq_init(&queue); 1042 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1043 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1044 continue; 1045 cbp = g_clone_bio(bp); 1046 if (cbp == NULL) { 1047 for (cbp = bioq_first(&queue); cbp != NULL; 1048 cbp = bioq_first(&queue)) { 1049 bioq_remove(&queue, cbp); 1050 g_destroy_bio(cbp); 1051 } 1052 if (bp->bio_error == 0) 1053 bp->bio_error = ENOMEM; 1054 g_io_deliver(bp, bp->bio_error); 1055 return; 1056 } 1057 bioq_insert_tail(&queue, cbp); 1058 cbp->bio_done = g_std_done; 1059 cbp->bio_caller1 = disk; 1060 cbp->bio_to = disk->d_consumer->provider; 1061 } 1062 for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) { 1063 bioq_remove(&queue, cbp); 1064 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1065 disk = cbp->bio_caller1; 1066 cbp->bio_caller1 = NULL; 1067 cp = disk->d_consumer; 1068 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1069 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1070 cp->acr, cp->acw, cp->ace)); 1071 g_io_request(cbp, disk->d_consumer); 1072 } 1073} 1074 1075static void 1076g_mirror_start(struct bio *bp) 1077{ 1078 struct g_mirror_softc *sc; 1079 1080 sc = bp->bio_to->geom->softc; 1081 /* 1082 * If sc == NULL or there are no valid disks, provider's error 1083 * should be set and g_mirror_start() should not be called at all. 1084 */ 1085 KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1086 ("Provider's error should be set (error=%d)(mirror=%s).", 1087 bp->bio_to->error, bp->bio_to->name)); 1088 G_MIRROR_LOGREQ(3, bp, "Request received."); 1089 1090 switch (bp->bio_cmd) { 1091 case BIO_READ: 1092 case BIO_WRITE: 1093 case BIO_DELETE: 1094 break; 1095 case BIO_FLUSH: 1096 g_mirror_flush(sc, bp); 1097 return; 1098 case BIO_GETATTR: 1099 if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) { 1100 g_mirror_kernel_dump(bp); 1101 return; 1102 } 1103 /* FALLTHROUGH */ 1104 default: 1105 g_io_deliver(bp, EOPNOTSUPP); 1106 return; 1107 } 1108 mtx_lock(&sc->sc_queue_mtx); 1109 bioq_disksort(&sc->sc_queue, bp); 1110 mtx_unlock(&sc->sc_queue_mtx); 1111 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 1112 wakeup(sc); 1113} 1114 1115/* 1116 * Return TRUE if the given request is colliding with a in-progress 1117 * synchronization request. 1118 */ 1119static int 1120g_mirror_sync_collision(struct g_mirror_softc *sc, struct bio *bp) 1121{ 1122 struct g_mirror_disk *disk; 1123 struct bio *sbp; 1124 off_t rstart, rend, sstart, send; 1125 int i; 1126 1127 if (sc->sc_sync.ds_ndisks == 0) 1128 return (0); 1129 rstart = bp->bio_offset; 1130 rend = bp->bio_offset + bp->bio_length; 1131 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1132 if (disk->d_state != G_MIRROR_DISK_STATE_SYNCHRONIZING) 1133 continue; 1134 for (i = 0; i < g_mirror_syncreqs; i++) { 1135 sbp = disk->d_sync.ds_bios[i]; 1136 if (sbp == NULL) 1137 continue; 1138 sstart = sbp->bio_offset; 1139 send = sbp->bio_offset + sbp->bio_length; 1140 if (rend > sstart && rstart < send) 1141 return (1); 1142 } 1143 } 1144 return (0); 1145} 1146 1147/* 1148 * Return TRUE if the given sync request is colliding with a in-progress regular 1149 * request. 1150 */ 1151static int 1152g_mirror_regular_collision(struct g_mirror_softc *sc, struct bio *sbp) 1153{ 1154 off_t rstart, rend, sstart, send; 1155 struct bio *bp; 1156 1157 if (sc->sc_sync.ds_ndisks == 0) 1158 return (0); 1159 sstart = sbp->bio_offset; 1160 send = sbp->bio_offset + sbp->bio_length; 1161 TAILQ_FOREACH(bp, &sc->sc_inflight.queue, bio_queue) { 1162 rstart = bp->bio_offset; 1163 rend = bp->bio_offset + bp->bio_length; 1164 if (rend > sstart && rstart < send) 1165 return (1); 1166 } 1167 return (0); 1168} 1169 1170/* 1171 * Puts request onto delayed queue. 1172 */ 1173static void 1174g_mirror_regular_delay(struct g_mirror_softc *sc, struct bio *bp) 1175{ 1176 1177 G_MIRROR_LOGREQ(2, bp, "Delaying request."); 1178 bioq_insert_head(&sc->sc_regular_delayed, bp); 1179} 1180 1181/* 1182 * Puts synchronization request onto delayed queue. 1183 */ 1184static void 1185g_mirror_sync_delay(struct g_mirror_softc *sc, struct bio *bp) 1186{ 1187 1188 G_MIRROR_LOGREQ(2, bp, "Delaying synchronization request."); 1189 bioq_insert_tail(&sc->sc_sync_delayed, bp); 1190} 1191 1192/* 1193 * Releases delayed regular requests which don't collide anymore with sync 1194 * requests. 1195 */ 1196static void 1197g_mirror_regular_release(struct g_mirror_softc *sc) 1198{ 1199 struct bio *bp, *bp2; 1200 1201 TAILQ_FOREACH_SAFE(bp, &sc->sc_regular_delayed.queue, bio_queue, bp2) { 1202 if (g_mirror_sync_collision(sc, bp)) 1203 continue; 1204 bioq_remove(&sc->sc_regular_delayed, bp); 1205 G_MIRROR_LOGREQ(2, bp, "Releasing delayed request (%p).", bp); 1206 mtx_lock(&sc->sc_queue_mtx); 1207 bioq_insert_head(&sc->sc_queue, bp); 1208#if 0 1209 /* 1210 * wakeup() is not needed, because this function is called from 1211 * the worker thread. 1212 */ 1213 wakeup(&sc->sc_queue); 1214#endif 1215 mtx_unlock(&sc->sc_queue_mtx); 1216 } 1217} 1218 1219/* 1220 * Releases delayed sync requests which don't collide anymore with regular 1221 * requests. 1222 */ 1223static void 1224g_mirror_sync_release(struct g_mirror_softc *sc) 1225{ 1226 struct bio *bp, *bp2; 1227 1228 TAILQ_FOREACH_SAFE(bp, &sc->sc_sync_delayed.queue, bio_queue, bp2) { 1229 if (g_mirror_regular_collision(sc, bp)) 1230 continue; 1231 bioq_remove(&sc->sc_sync_delayed, bp); 1232 G_MIRROR_LOGREQ(2, bp, 1233 "Releasing delayed synchronization request."); 1234 g_io_request(bp, bp->bio_from); 1235 } 1236} 1237 1238/* 1239 * Handle synchronization requests. 1240 * Every synchronization request is two-steps process: first, READ request is 1241 * send to active provider and then WRITE request (with read data) to the provider 1242 * beeing synchronized. When WRITE is finished, new synchronization request is 1243 * send. 1244 */ 1245static void 1246g_mirror_sync_request(struct bio *bp) 1247{ 1248 struct g_mirror_softc *sc; 1249 struct g_mirror_disk *disk; 1250 1251 bp->bio_from->index--; 1252 sc = bp->bio_from->geom->softc; 1253 disk = bp->bio_from->private; 1254 if (disk == NULL) { 1255 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 1256 g_topology_lock(); 1257 g_mirror_kill_consumer(sc, bp->bio_from); 1258 g_topology_unlock(); 1259 free(bp->bio_data, M_MIRROR); 1260 g_destroy_bio(bp); 1261 sx_xlock(&sc->sc_lock); 1262 return; 1263 } 1264 1265 /* 1266 * Synchronization request. 1267 */ 1268 switch (bp->bio_cmd) { 1269 case BIO_READ: 1270 { 1271 struct g_consumer *cp; 1272 1273 if (bp->bio_error != 0) { 1274 G_MIRROR_LOGREQ(0, bp, 1275 "Synchronization request failed (error=%d).", 1276 bp->bio_error); 1277 g_destroy_bio(bp); 1278 return; 1279 } 1280 G_MIRROR_LOGREQ(3, bp, 1281 "Synchronization request half-finished."); 1282 bp->bio_cmd = BIO_WRITE; 1283 bp->bio_cflags = 0; 1284 cp = disk->d_consumer; 1285 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1286 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1287 cp->acr, cp->acw, cp->ace)); 1288 cp->index++; 1289 g_io_request(bp, cp); 1290 return; 1291 } 1292 case BIO_WRITE: 1293 { 1294 struct g_mirror_disk_sync *sync; 1295 off_t offset; 1296 void *data; 1297 int i; 1298 1299 if (bp->bio_error != 0) { 1300 G_MIRROR_LOGREQ(0, bp, 1301 "Synchronization request failed (error=%d).", 1302 bp->bio_error); 1303 g_destroy_bio(bp); 1304 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 1305 g_mirror_event_send(disk, 1306 G_MIRROR_DISK_STATE_DISCONNECTED, 1307 G_MIRROR_EVENT_DONTWAIT); 1308 return; 1309 } 1310 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished."); 1311 sync = &disk->d_sync; 1312 if (sync->ds_offset == sc->sc_mediasize || 1313 sync->ds_consumer == NULL || 1314 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1315 /* Don't send more synchronization requests. */ 1316 sync->ds_inflight--; 1317 if (sync->ds_bios != NULL) { 1318 i = (int)(uintptr_t)bp->bio_caller1; 1319 sync->ds_bios[i] = NULL; 1320 } 1321 free(bp->bio_data, M_MIRROR); 1322 g_destroy_bio(bp); 1323 if (sync->ds_inflight > 0) 1324 return; 1325 if (sync->ds_consumer == NULL || 1326 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1327 return; 1328 } 1329 /* Disk up-to-date, activate it. */ 1330 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE, 1331 G_MIRROR_EVENT_DONTWAIT); 1332 return; 1333 } 1334 1335 /* Send next synchronization request. */ 1336 data = bp->bio_data; 1337 bzero(bp, sizeof(*bp)); 1338 bp->bio_cmd = BIO_READ; 1339 bp->bio_offset = sync->ds_offset; 1340 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset); 1341 sync->ds_offset += bp->bio_length; 1342 bp->bio_done = g_mirror_sync_done; 1343 bp->bio_data = data; 1344 bp->bio_from = sync->ds_consumer; 1345 bp->bio_to = sc->sc_provider; 1346 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 1347 sync->ds_consumer->index++; 1348 /* 1349 * Delay the request if it is colliding with a regular request. 1350 */ 1351 if (g_mirror_regular_collision(sc, bp)) 1352 g_mirror_sync_delay(sc, bp); 1353 else 1354 g_io_request(bp, sync->ds_consumer); 1355 1356 /* Release delayed requests if possible. */ 1357 g_mirror_regular_release(sc); 1358 1359 /* Find the smallest offset */ 1360 offset = sc->sc_mediasize; 1361 for (i = 0; i < g_mirror_syncreqs; i++) { 1362 bp = sync->ds_bios[i]; 1363 if (bp->bio_offset < offset) 1364 offset = bp->bio_offset; 1365 } 1366 if (sync->ds_offset_done + (MAXPHYS * 100) < offset) { 1367 /* Update offset_done on every 100 blocks. */ 1368 sync->ds_offset_done = offset; 1369 g_mirror_update_metadata(disk); 1370 } 1371 return; 1372 } 1373 default: 1374 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1375 bp->bio_cmd, sc->sc_name)); 1376 break; 1377 } 1378} 1379 1380static void 1381g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp) 1382{ 1383 struct g_mirror_disk *disk; 1384 struct g_consumer *cp; 1385 struct bio *cbp; 1386 1387 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1388 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE) 1389 break; 1390 } 1391 if (disk == NULL) { 1392 if (bp->bio_error == 0) 1393 bp->bio_error = ENXIO; 1394 g_io_deliver(bp, bp->bio_error); 1395 return; 1396 } 1397 cbp = g_clone_bio(bp); 1398 if (cbp == NULL) { 1399 if (bp->bio_error == 0) 1400 bp->bio_error = ENOMEM; 1401 g_io_deliver(bp, bp->bio_error); 1402 return; 1403 } 1404 /* 1405 * Fill in the component buf structure. 1406 */ 1407 cp = disk->d_consumer; 1408 cbp->bio_done = g_mirror_done; 1409 cbp->bio_to = cp->provider; 1410 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1411 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1412 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1413 cp->acw, cp->ace)); 1414 cp->index++; 1415 g_io_request(cbp, cp); 1416} 1417 1418static void 1419g_mirror_request_round_robin(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 disk = g_mirror_get_disk(sc); 1426 if (disk == NULL) { 1427 if (bp->bio_error == 0) 1428 bp->bio_error = ENXIO; 1429 g_io_deliver(bp, bp->bio_error); 1430 return; 1431 } 1432 cbp = g_clone_bio(bp); 1433 if (cbp == NULL) { 1434 if (bp->bio_error == 0) 1435 bp->bio_error = ENOMEM; 1436 g_io_deliver(bp, bp->bio_error); 1437 return; 1438 } 1439 /* 1440 * Fill in the component buf structure. 1441 */ 1442 cp = disk->d_consumer; 1443 cbp->bio_done = g_mirror_done; 1444 cbp->bio_to = cp->provider; 1445 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1446 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1447 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1448 cp->acw, cp->ace)); 1449 cp->index++; 1450 g_io_request(cbp, cp); 1451} 1452 1453#define TRACK_SIZE (1 * 1024 * 1024) 1454#define LOAD_SCALE 256 1455#define ABS(x) (((x) >= 0) ? (x) : (-(x))) 1456 1457static void 1458g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp) 1459{ 1460 struct g_mirror_disk *disk, *dp; 1461 struct g_consumer *cp; 1462 struct bio *cbp; 1463 int prio, best; 1464 1465 /* Find a disk with the smallest load. */ 1466 disk = NULL; 1467 best = INT_MAX; 1468 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1469 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1470 continue; 1471 prio = dp->load; 1472 /* If disk head is precisely in position - highly prefer it. */ 1473 if (dp->d_last_offset == bp->bio_offset) 1474 prio -= 2 * LOAD_SCALE; 1475 else 1476 /* If disk head is close to position - prefer it. */ 1477 if (ABS(dp->d_last_offset - bp->bio_offset) < TRACK_SIZE) 1478 prio -= 1 * LOAD_SCALE; 1479 if (prio <= best) { 1480 disk = dp; 1481 best = prio; 1482 } 1483 } 1484 KASSERT(disk != NULL, ("NULL disk for %s.", sc->sc_name)); 1485 cbp = g_clone_bio(bp); 1486 if (cbp == NULL) { 1487 if (bp->bio_error == 0) 1488 bp->bio_error = ENOMEM; 1489 g_io_deliver(bp, bp->bio_error); 1490 return; 1491 } 1492 /* 1493 * Fill in the component buf structure. 1494 */ 1495 cp = disk->d_consumer; 1496 cbp->bio_done = g_mirror_done; 1497 cbp->bio_to = cp->provider; 1498 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1499 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1500 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1501 cp->acw, cp->ace)); 1502 cp->index++; 1503 /* Remember last head position */ 1504 disk->d_last_offset = bp->bio_offset + bp->bio_length; 1505 /* Update loads. */ 1506 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1507 dp->load = (dp->d_consumer->index * LOAD_SCALE + 1508 dp->load * 7) / 8; 1509 } 1510 g_io_request(cbp, cp); 1511} 1512 1513static void 1514g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp) 1515{ 1516 struct bio_queue_head queue; 1517 struct g_mirror_disk *disk; 1518 struct g_consumer *cp; 1519 struct bio *cbp; 1520 off_t left, mod, offset, slice; 1521 u_char *data; 1522 u_int ndisks; 1523 1524 if (bp->bio_length <= sc->sc_slice) { 1525 g_mirror_request_round_robin(sc, bp); 1526 return; 1527 } 1528 ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE); 1529 slice = bp->bio_length / ndisks; 1530 mod = slice % sc->sc_provider->sectorsize; 1531 if (mod != 0) 1532 slice += sc->sc_provider->sectorsize - mod; 1533 /* 1534 * Allocate all bios before sending any request, so we can 1535 * return ENOMEM in nice and clean way. 1536 */ 1537 left = bp->bio_length; 1538 offset = bp->bio_offset; 1539 data = bp->bio_data; 1540 bioq_init(&queue); 1541 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1542 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1543 continue; 1544 cbp = g_clone_bio(bp); 1545 if (cbp == NULL) { 1546 for (cbp = bioq_first(&queue); cbp != NULL; 1547 cbp = bioq_first(&queue)) { 1548 bioq_remove(&queue, cbp); 1549 g_destroy_bio(cbp); 1550 } 1551 if (bp->bio_error == 0) 1552 bp->bio_error = ENOMEM; 1553 g_io_deliver(bp, bp->bio_error); 1554 return; 1555 } 1556 bioq_insert_tail(&queue, cbp); 1557 cbp->bio_done = g_mirror_done; 1558 cbp->bio_caller1 = disk; 1559 cbp->bio_to = disk->d_consumer->provider; 1560 cbp->bio_offset = offset; 1561 cbp->bio_data = data; 1562 cbp->bio_length = MIN(left, slice); 1563 left -= cbp->bio_length; 1564 if (left == 0) 1565 break; 1566 offset += cbp->bio_length; 1567 data += cbp->bio_length; 1568 } 1569 for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) { 1570 bioq_remove(&queue, cbp); 1571 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1572 disk = cbp->bio_caller1; 1573 cbp->bio_caller1 = NULL; 1574 cp = disk->d_consumer; 1575 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1576 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1577 cp->acr, cp->acw, cp->ace)); 1578 disk->d_consumer->index++; 1579 g_io_request(cbp, disk->d_consumer); 1580 } 1581} 1582 1583static void 1584g_mirror_register_request(struct bio *bp) 1585{ 1586 struct g_mirror_softc *sc; 1587 1588 sc = bp->bio_to->geom->softc; 1589 switch (bp->bio_cmd) { 1590 case BIO_READ: 1591 switch (sc->sc_balance) { 1592 case G_MIRROR_BALANCE_LOAD: 1593 g_mirror_request_load(sc, bp); 1594 break; 1595 case G_MIRROR_BALANCE_PREFER: 1596 g_mirror_request_prefer(sc, bp); 1597 break; 1598 case G_MIRROR_BALANCE_ROUND_ROBIN: 1599 g_mirror_request_round_robin(sc, bp); 1600 break; 1601 case G_MIRROR_BALANCE_SPLIT: 1602 g_mirror_request_split(sc, bp); 1603 break; 1604 } 1605 return; 1606 case BIO_WRITE: 1607 case BIO_DELETE: 1608 { 1609 struct g_mirror_disk *disk; 1610 struct g_mirror_disk_sync *sync; 1611 struct bio_queue_head queue; 1612 struct g_consumer *cp; 1613 struct bio *cbp; 1614 1615 /* 1616 * Delay the request if it is colliding with a synchronization 1617 * request. 1618 */ 1619 if (g_mirror_sync_collision(sc, bp)) { 1620 g_mirror_regular_delay(sc, bp); 1621 return; 1622 } 1623 1624 if (sc->sc_idle) 1625 g_mirror_unidle(sc); 1626 else 1627 sc->sc_last_write = time_uptime; 1628 1629 /* 1630 * Allocate all bios before sending any request, so we can 1631 * return ENOMEM in nice and clean way. 1632 */ 1633 bioq_init(&queue); 1634 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1635 sync = &disk->d_sync; 1636 switch (disk->d_state) { 1637 case G_MIRROR_DISK_STATE_ACTIVE: 1638 break; 1639 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 1640 if (bp->bio_offset >= sync->ds_offset) 1641 continue; 1642 break; 1643 default: 1644 continue; 1645 } 1646 cbp = g_clone_bio(bp); 1647 if (cbp == NULL) { 1648 for (cbp = bioq_first(&queue); cbp != NULL; 1649 cbp = bioq_first(&queue)) { 1650 bioq_remove(&queue, cbp); 1651 g_destroy_bio(cbp); 1652 } 1653 if (bp->bio_error == 0) 1654 bp->bio_error = ENOMEM; 1655 g_io_deliver(bp, bp->bio_error); 1656 return; 1657 } 1658 bioq_insert_tail(&queue, cbp); 1659 cbp->bio_done = g_mirror_done; 1660 cp = disk->d_consumer; 1661 cbp->bio_caller1 = cp; 1662 cbp->bio_to = cp->provider; 1663 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1664 ("Consumer %s not opened (r%dw%de%d).", 1665 cp->provider->name, cp->acr, cp->acw, cp->ace)); 1666 } 1667 for (cbp = bioq_first(&queue); cbp != NULL; 1668 cbp = bioq_first(&queue)) { 1669 bioq_remove(&queue, cbp); 1670 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1671 cp = cbp->bio_caller1; 1672 cbp->bio_caller1 = NULL; 1673 cp->index++; 1674 sc->sc_writes++; 1675 g_io_request(cbp, cp); 1676 } 1677 /* 1678 * Put request onto inflight queue, so we can check if new 1679 * synchronization requests don't collide with it. 1680 */ 1681 bioq_insert_tail(&sc->sc_inflight, bp); 1682 /* 1683 * Bump syncid on first write. 1684 */ 1685 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) { 1686 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 1687 g_mirror_bump_syncid(sc); 1688 } 1689 return; 1690 } 1691 default: 1692 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1693 bp->bio_cmd, sc->sc_name)); 1694 break; 1695 } 1696} 1697 1698static int 1699g_mirror_can_destroy(struct g_mirror_softc *sc) 1700{ 1701 struct g_geom *gp; 1702 struct g_consumer *cp; 1703 1704 g_topology_assert(); 1705 gp = sc->sc_geom; 1706 if (gp->softc == NULL) 1707 return (1); 1708 LIST_FOREACH(cp, &gp->consumer, consumer) { 1709 if (g_mirror_is_busy(sc, cp)) 1710 return (0); 1711 } 1712 gp = sc->sc_sync.ds_geom; 1713 LIST_FOREACH(cp, &gp->consumer, consumer) { 1714 if (g_mirror_is_busy(sc, cp)) 1715 return (0); 1716 } 1717 G_MIRROR_DEBUG(2, "No I/O requests for %s, it can be destroyed.", 1718 sc->sc_name); 1719 return (1); 1720} 1721 1722static int 1723g_mirror_try_destroy(struct g_mirror_softc *sc) 1724{ 1725 1726 if (sc->sc_rootmount != NULL) { 1727 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 1728 sc->sc_rootmount); 1729 root_mount_rel(sc->sc_rootmount); 1730 sc->sc_rootmount = NULL; 1731 } 1732 g_topology_lock(); 1733 if (!g_mirror_can_destroy(sc)) { 1734 g_topology_unlock(); 1735 return (0); 1736 } 1737 sc->sc_geom->softc = NULL; 1738 sc->sc_sync.ds_geom->softc = NULL; 1739 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WAIT) != 0) { 1740 g_topology_unlock(); 1741 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1742 &sc->sc_worker); 1743 /* Unlock sc_lock here, as it can be destroyed after wakeup. */ 1744 sx_xunlock(&sc->sc_lock); 1745 wakeup(&sc->sc_worker); 1746 sc->sc_worker = NULL; 1747 } else { 1748 g_topology_unlock(); 1749 g_mirror_destroy_device(sc); 1750 free(sc, M_MIRROR); 1751 } 1752 return (1); 1753} 1754 1755/* 1756 * Worker thread. 1757 */ 1758static void 1759g_mirror_worker(void *arg) 1760{ 1761 struct g_mirror_softc *sc; 1762 struct g_mirror_event *ep; 1763 struct bio *bp; 1764 int timeout; 1765 1766 sc = arg; 1767 thread_lock(curthread); 1768 sched_prio(curthread, PRIBIO); 1769 thread_unlock(curthread); 1770 1771 sx_xlock(&sc->sc_lock); 1772 for (;;) { 1773 G_MIRROR_DEBUG(5, "%s: Let's see...", __func__); 1774 /* 1775 * First take a look at events. 1776 * This is important to handle events before any I/O requests. 1777 */ 1778 ep = g_mirror_event_get(sc); 1779 if (ep != NULL) { 1780 g_mirror_event_remove(sc, ep); 1781 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) { 1782 /* Update only device status. */ 1783 G_MIRROR_DEBUG(3, 1784 "Running event for device %s.", 1785 sc->sc_name); 1786 ep->e_error = 0; 1787 g_mirror_update_device(sc, 1); 1788 } else { 1789 /* Update disk status. */ 1790 G_MIRROR_DEBUG(3, "Running event for disk %s.", 1791 g_mirror_get_diskname(ep->e_disk)); 1792 ep->e_error = g_mirror_update_disk(ep->e_disk, 1793 ep->e_state); 1794 if (ep->e_error == 0) 1795 g_mirror_update_device(sc, 0); 1796 } 1797 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) { 1798 KASSERT(ep->e_error == 0, 1799 ("Error cannot be handled.")); 1800 g_mirror_event_free(ep); 1801 } else { 1802 ep->e_flags |= G_MIRROR_EVENT_DONE; 1803 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1804 ep); 1805 mtx_lock(&sc->sc_events_mtx); 1806 wakeup(ep); 1807 mtx_unlock(&sc->sc_events_mtx); 1808 } 1809 if ((sc->sc_flags & 1810 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1811 if (g_mirror_try_destroy(sc)) { 1812 curthread->td_pflags &= ~TDP_GEOM; 1813 G_MIRROR_DEBUG(1, "Thread exiting."); 1814 kproc_exit(0); 1815 } 1816 } 1817 G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__); 1818 continue; 1819 } 1820 /* 1821 * Check if we can mark array as CLEAN and if we can't take 1822 * how much seconds should we wait. 1823 */ 1824 timeout = g_mirror_idle(sc, -1); 1825 /* 1826 * Now I/O requests. 1827 */ 1828 /* Get first request from the queue. */ 1829 mtx_lock(&sc->sc_queue_mtx); 1830 bp = bioq_first(&sc->sc_queue); 1831 if (bp == NULL) { 1832 if ((sc->sc_flags & 1833 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1834 mtx_unlock(&sc->sc_queue_mtx); 1835 if (g_mirror_try_destroy(sc)) { 1836 curthread->td_pflags &= ~TDP_GEOM; 1837 G_MIRROR_DEBUG(1, "Thread exiting."); 1838 kproc_exit(0); 1839 } 1840 mtx_lock(&sc->sc_queue_mtx); 1841 } 1842 sx_xunlock(&sc->sc_lock); 1843 /* 1844 * XXX: We can miss an event here, because an event 1845 * can be added without sx-device-lock and without 1846 * mtx-queue-lock. Maybe I should just stop using 1847 * dedicated mutex for events synchronization and 1848 * stick with the queue lock? 1849 * The event will hang here until next I/O request 1850 * or next event is received. 1851 */ 1852 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w1", 1853 timeout * hz); 1854 sx_xlock(&sc->sc_lock); 1855 G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__); 1856 continue; 1857 } 1858 bioq_remove(&sc->sc_queue, bp); 1859 mtx_unlock(&sc->sc_queue_mtx); 1860 1861 if (bp->bio_from->geom == sc->sc_sync.ds_geom && 1862 (bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) { 1863 g_mirror_sync_request(bp); /* READ */ 1864 } else if (bp->bio_to != sc->sc_provider) { 1865 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0) 1866 g_mirror_regular_request(bp); 1867 else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 1868 g_mirror_sync_request(bp); /* WRITE */ 1869 else { 1870 KASSERT(0, 1871 ("Invalid request cflags=0x%hhx to=%s.", 1872 bp->bio_cflags, bp->bio_to->name)); 1873 } 1874 } else { 1875 g_mirror_register_request(bp); 1876 } 1877 G_MIRROR_DEBUG(5, "%s: I'm here 9.", __func__); 1878 } 1879} 1880 1881static void 1882g_mirror_update_idle(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 1883{ 1884 1885 sx_assert(&sc->sc_lock, SX_LOCKED); 1886 1887 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 1888 return; 1889 if (!sc->sc_idle && (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) { 1890 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.", 1891 g_mirror_get_diskname(disk), sc->sc_name); 1892 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1893 } else if (sc->sc_idle && 1894 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 1895 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.", 1896 g_mirror_get_diskname(disk), sc->sc_name); 1897 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 1898 } 1899} 1900 1901static void 1902g_mirror_sync_start(struct g_mirror_disk *disk) 1903{ 1904 struct g_mirror_softc *sc; 1905 struct g_consumer *cp; 1906 struct bio *bp; 1907 int error, i; 1908 1909 g_topology_assert_not(); 1910 sc = disk->d_softc; 1911 sx_assert(&sc->sc_lock, SX_LOCKED); 1912 1913 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 1914 ("Disk %s is not marked for synchronization.", 1915 g_mirror_get_diskname(disk))); 1916 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1917 ("Device not in RUNNING state (%s, %u).", sc->sc_name, 1918 sc->sc_state)); 1919 1920 sx_xunlock(&sc->sc_lock); 1921 g_topology_lock(); 1922 cp = g_new_consumer(sc->sc_sync.ds_geom); 1923 error = g_attach(cp, sc->sc_provider); 1924 KASSERT(error == 0, 1925 ("Cannot attach to %s (error=%d).", sc->sc_name, error)); 1926 error = g_access(cp, 1, 0, 0); 1927 KASSERT(error == 0, ("Cannot open %s (error=%d).", sc->sc_name, error)); 1928 g_topology_unlock(); 1929 sx_xlock(&sc->sc_lock); 1930 1931 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name, 1932 g_mirror_get_diskname(disk)); 1933 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) == 0) 1934 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1935 KASSERT(disk->d_sync.ds_consumer == NULL, 1936 ("Sync consumer already exists (device=%s, disk=%s).", 1937 sc->sc_name, g_mirror_get_diskname(disk))); 1938 1939 disk->d_sync.ds_consumer = cp; 1940 disk->d_sync.ds_consumer->private = disk; 1941 disk->d_sync.ds_consumer->index = 0; 1942 1943 /* 1944 * Allocate memory for synchronization bios and initialize them. 1945 */ 1946 disk->d_sync.ds_bios = malloc(sizeof(struct bio *) * g_mirror_syncreqs, 1947 M_MIRROR, M_WAITOK); 1948 for (i = 0; i < g_mirror_syncreqs; i++) { 1949 bp = g_alloc_bio(); 1950 disk->d_sync.ds_bios[i] = bp; 1951 bp->bio_parent = NULL; 1952 bp->bio_cmd = BIO_READ; 1953 bp->bio_data = malloc(MAXPHYS, M_MIRROR, M_WAITOK); 1954 bp->bio_cflags = 0; 1955 bp->bio_offset = disk->d_sync.ds_offset; 1956 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset); 1957 disk->d_sync.ds_offset += bp->bio_length; 1958 bp->bio_done = g_mirror_sync_done; 1959 bp->bio_from = disk->d_sync.ds_consumer; 1960 bp->bio_to = sc->sc_provider; 1961 bp->bio_caller1 = (void *)(uintptr_t)i; 1962 } 1963 1964 /* Increase the number of disks in SYNCHRONIZING state. */ 1965 sc->sc_sync.ds_ndisks++; 1966 /* Set the number of in-flight synchronization requests. */ 1967 disk->d_sync.ds_inflight = g_mirror_syncreqs; 1968 1969 /* 1970 * Fire off first synchronization requests. 1971 */ 1972 for (i = 0; i < g_mirror_syncreqs; i++) { 1973 bp = disk->d_sync.ds_bios[i]; 1974 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 1975 disk->d_sync.ds_consumer->index++; 1976 /* 1977 * Delay the request if it is colliding with a regular request. 1978 */ 1979 if (g_mirror_regular_collision(sc, bp)) 1980 g_mirror_sync_delay(sc, bp); 1981 else 1982 g_io_request(bp, disk->d_sync.ds_consumer); 1983 } 1984} 1985 1986/* 1987 * Stop synchronization process. 1988 * type: 0 - synchronization finished 1989 * 1 - synchronization stopped 1990 */ 1991static void 1992g_mirror_sync_stop(struct g_mirror_disk *disk, int type) 1993{ 1994 struct g_mirror_softc *sc; 1995 struct g_consumer *cp; 1996 1997 g_topology_assert_not(); 1998 sc = disk->d_softc; 1999 sx_assert(&sc->sc_lock, SX_LOCKED); 2000 2001 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2002 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2003 g_mirror_disk_state2str(disk->d_state))); 2004 if (disk->d_sync.ds_consumer == NULL) 2005 return; 2006 2007 if (type == 0) { 2008 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.", 2009 sc->sc_name, g_mirror_get_diskname(disk)); 2010 } else /* if (type == 1) */ { 2011 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.", 2012 sc->sc_name, g_mirror_get_diskname(disk)); 2013 } 2014 free(disk->d_sync.ds_bios, M_MIRROR); 2015 disk->d_sync.ds_bios = NULL; 2016 cp = disk->d_sync.ds_consumer; 2017 disk->d_sync.ds_consumer = NULL; 2018 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2019 sc->sc_sync.ds_ndisks--; 2020 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 2021 g_topology_lock(); 2022 g_mirror_kill_consumer(sc, cp); 2023 g_topology_unlock(); 2024 sx_xlock(&sc->sc_lock); 2025} 2026 2027static void 2028g_mirror_launch_provider(struct g_mirror_softc *sc) 2029{ 2030 struct g_mirror_disk *disk; 2031 struct g_provider *pp; 2032 2033 sx_assert(&sc->sc_lock, SX_LOCKED); 2034 2035 g_topology_lock(); 2036 pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name); 2037 pp->mediasize = sc->sc_mediasize; 2038 pp->sectorsize = sc->sc_sectorsize; 2039 pp->stripesize = 0; 2040 pp->stripeoffset = 0; 2041 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2042 if (disk->d_consumer && disk->d_consumer->provider && 2043 disk->d_consumer->provider->stripesize > pp->stripesize) { 2044 pp->stripesize = disk->d_consumer->provider->stripesize; 2045 pp->stripeoffset = disk->d_consumer->provider->stripeoffset; 2046 } 2047 } 2048 sc->sc_provider = pp; 2049 g_error_provider(pp, 0); 2050 g_topology_unlock(); 2051 G_MIRROR_DEBUG(0, "Device %s launched (%u/%u).", pp->name, 2052 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE), sc->sc_ndisks); 2053 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2054 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2055 g_mirror_sync_start(disk); 2056 } 2057} 2058 2059static void 2060g_mirror_destroy_provider(struct g_mirror_softc *sc) 2061{ 2062 struct g_mirror_disk *disk; 2063 struct bio *bp; 2064 2065 g_topology_assert_not(); 2066 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).", 2067 sc->sc_name)); 2068 2069 g_topology_lock(); 2070 g_error_provider(sc->sc_provider, ENXIO); 2071 mtx_lock(&sc->sc_queue_mtx); 2072 while ((bp = bioq_first(&sc->sc_queue)) != NULL) { 2073 bioq_remove(&sc->sc_queue, bp); 2074 g_io_deliver(bp, ENXIO); 2075 } 2076 mtx_unlock(&sc->sc_queue_mtx); 2077 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", sc->sc_name, 2078 sc->sc_provider->name); 2079 sc->sc_provider->flags |= G_PF_WITHER; 2080 g_orphan_provider(sc->sc_provider, ENXIO); 2081 g_topology_unlock(); 2082 sc->sc_provider = NULL; 2083 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2084 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2085 g_mirror_sync_stop(disk, 1); 2086 } 2087} 2088 2089static void 2090g_mirror_go(void *arg) 2091{ 2092 struct g_mirror_softc *sc; 2093 2094 sc = arg; 2095 G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name); 2096 g_mirror_event_send(sc, 0, 2097 G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE); 2098} 2099 2100static u_int 2101g_mirror_determine_state(struct g_mirror_disk *disk) 2102{ 2103 struct g_mirror_softc *sc; 2104 u_int state; 2105 2106 sc = disk->d_softc; 2107 if (sc->sc_syncid == disk->d_sync.ds_syncid) { 2108 if ((disk->d_flags & 2109 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2110 /* Disk does not need synchronization. */ 2111 state = G_MIRROR_DISK_STATE_ACTIVE; 2112 } else { 2113 if ((sc->sc_flags & 2114 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2115 (disk->d_flags & 2116 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2117 /* 2118 * We can start synchronization from 2119 * the stored offset. 2120 */ 2121 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2122 } else { 2123 state = G_MIRROR_DISK_STATE_STALE; 2124 } 2125 } 2126 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) { 2127 /* 2128 * Reset all synchronization data for this disk, 2129 * because if it even was synchronized, it was 2130 * synchronized to disks with different syncid. 2131 */ 2132 disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2133 disk->d_sync.ds_offset = 0; 2134 disk->d_sync.ds_offset_done = 0; 2135 disk->d_sync.ds_syncid = sc->sc_syncid; 2136 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2137 (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2138 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2139 } else { 2140 state = G_MIRROR_DISK_STATE_STALE; 2141 } 2142 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ { 2143 /* 2144 * Not good, NOT GOOD! 2145 * It means that mirror was started on stale disks 2146 * and more fresh disk just arrive. 2147 * If there were writes, mirror is broken, sorry. 2148 * I think the best choice here is don't touch 2149 * this disk and inform the user loudly. 2150 */ 2151 G_MIRROR_DEBUG(0, "Device %s was started before the freshest " 2152 "disk (%s) arrives!! It will not be connected to the " 2153 "running device.", sc->sc_name, 2154 g_mirror_get_diskname(disk)); 2155 g_mirror_destroy_disk(disk); 2156 state = G_MIRROR_DISK_STATE_NONE; 2157 /* Return immediately, because disk was destroyed. */ 2158 return (state); 2159 } 2160 G_MIRROR_DEBUG(3, "State for %s disk: %s.", 2161 g_mirror_get_diskname(disk), g_mirror_disk_state2str(state)); 2162 return (state); 2163} 2164 2165/* 2166 * Update device state. 2167 */ 2168static void 2169g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force) 2170{ 2171 struct g_mirror_disk *disk; 2172 u_int state; 2173 2174 sx_assert(&sc->sc_lock, SX_XLOCKED); 2175 2176 switch (sc->sc_state) { 2177 case G_MIRROR_DEVICE_STATE_STARTING: 2178 { 2179 struct g_mirror_disk *pdisk, *tdisk; 2180 u_int dirty, ndisks, genid, syncid; 2181 2182 KASSERT(sc->sc_provider == NULL, 2183 ("Non-NULL provider in STARTING state (%s).", sc->sc_name)); 2184 /* 2185 * Are we ready? We are, if all disks are connected or 2186 * if we have any disks and 'force' is true. 2187 */ 2188 ndisks = g_mirror_ndisks(sc, -1); 2189 if (sc->sc_ndisks == ndisks || (force && ndisks > 0)) { 2190 ; 2191 } else if (ndisks == 0) { 2192 /* 2193 * Disks went down in starting phase, so destroy 2194 * device. 2195 */ 2196 callout_drain(&sc->sc_callout); 2197 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2198 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 2199 sc->sc_rootmount); 2200 root_mount_rel(sc->sc_rootmount); 2201 sc->sc_rootmount = NULL; 2202 return; 2203 } else { 2204 return; 2205 } 2206 2207 /* 2208 * Activate all disks with the biggest syncid. 2209 */ 2210 if (force) { 2211 /* 2212 * If 'force' is true, we have been called due to 2213 * timeout, so don't bother canceling timeout. 2214 */ 2215 ndisks = 0; 2216 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2217 if ((disk->d_flags & 2218 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2219 ndisks++; 2220 } 2221 } 2222 if (ndisks == 0) { 2223 /* No valid disks found, destroy device. */ 2224 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2225 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2226 __LINE__, sc->sc_rootmount); 2227 root_mount_rel(sc->sc_rootmount); 2228 sc->sc_rootmount = NULL; 2229 return; 2230 } 2231 } else { 2232 /* Cancel timeout. */ 2233 callout_drain(&sc->sc_callout); 2234 } 2235 2236 /* 2237 * Find the biggest genid. 2238 */ 2239 genid = 0; 2240 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2241 if (disk->d_genid > genid) 2242 genid = disk->d_genid; 2243 } 2244 sc->sc_genid = genid; 2245 /* 2246 * Remove all disks without the biggest genid. 2247 */ 2248 LIST_FOREACH_SAFE(disk, &sc->sc_disks, d_next, tdisk) { 2249 if (disk->d_genid < genid) { 2250 G_MIRROR_DEBUG(0, 2251 "Component %s (device %s) broken, skipping.", 2252 g_mirror_get_diskname(disk), sc->sc_name); 2253 g_mirror_destroy_disk(disk); 2254 } 2255 } 2256 2257 /* 2258 * Find the biggest syncid. 2259 */ 2260 syncid = 0; 2261 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2262 if (disk->d_sync.ds_syncid > syncid) 2263 syncid = disk->d_sync.ds_syncid; 2264 } 2265 2266 /* 2267 * Here we need to look for dirty disks and if all disks 2268 * with the biggest syncid are dirty, we have to choose 2269 * one with the biggest priority and rebuild the rest. 2270 */ 2271 /* 2272 * Find the number of dirty disks with the biggest syncid. 2273 * Find the number of disks with the biggest syncid. 2274 * While here, find a disk with the biggest priority. 2275 */ 2276 dirty = ndisks = 0; 2277 pdisk = NULL; 2278 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2279 if (disk->d_sync.ds_syncid != syncid) 2280 continue; 2281 if ((disk->d_flags & 2282 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2283 continue; 2284 } 2285 ndisks++; 2286 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 2287 dirty++; 2288 if (pdisk == NULL || 2289 pdisk->d_priority < disk->d_priority) { 2290 pdisk = disk; 2291 } 2292 } 2293 } 2294 if (dirty == 0) { 2295 /* No dirty disks at all, great. */ 2296 } else if (dirty == ndisks) { 2297 /* 2298 * Force synchronization for all dirty disks except one 2299 * with the biggest priority. 2300 */ 2301 KASSERT(pdisk != NULL, ("pdisk == NULL")); 2302 G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a " 2303 "master disk for synchronization.", 2304 g_mirror_get_diskname(pdisk), sc->sc_name); 2305 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2306 if (disk->d_sync.ds_syncid != syncid) 2307 continue; 2308 if ((disk->d_flags & 2309 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2310 continue; 2311 } 2312 KASSERT((disk->d_flags & 2313 G_MIRROR_DISK_FLAG_DIRTY) != 0, 2314 ("Disk %s isn't marked as dirty.", 2315 g_mirror_get_diskname(disk))); 2316 /* Skip the disk with the biggest priority. */ 2317 if (disk == pdisk) 2318 continue; 2319 disk->d_sync.ds_syncid = 0; 2320 } 2321 } else if (dirty < ndisks) { 2322 /* 2323 * Force synchronization for all dirty disks. 2324 * We have some non-dirty disks. 2325 */ 2326 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2327 if (disk->d_sync.ds_syncid != syncid) 2328 continue; 2329 if ((disk->d_flags & 2330 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2331 continue; 2332 } 2333 if ((disk->d_flags & 2334 G_MIRROR_DISK_FLAG_DIRTY) == 0) { 2335 continue; 2336 } 2337 disk->d_sync.ds_syncid = 0; 2338 } 2339 } 2340 2341 /* Reset hint. */ 2342 sc->sc_hint = NULL; 2343 sc->sc_syncid = syncid; 2344 if (force) { 2345 /* Remember to bump syncid on first write. */ 2346 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2347 } 2348 state = G_MIRROR_DEVICE_STATE_RUNNING; 2349 G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.", 2350 sc->sc_name, g_mirror_device_state2str(sc->sc_state), 2351 g_mirror_device_state2str(state)); 2352 sc->sc_state = state; 2353 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2354 state = g_mirror_determine_state(disk); 2355 g_mirror_event_send(disk, state, 2356 G_MIRROR_EVENT_DONTWAIT); 2357 if (state == G_MIRROR_DISK_STATE_STALE) 2358 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2359 } 2360 break; 2361 } 2362 case G_MIRROR_DEVICE_STATE_RUNNING: 2363 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 && 2364 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2365 /* 2366 * No active disks or no disks at all, 2367 * so destroy device. 2368 */ 2369 if (sc->sc_provider != NULL) 2370 g_mirror_destroy_provider(sc); 2371 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2372 break; 2373 } else if (g_mirror_ndisks(sc, 2374 G_MIRROR_DISK_STATE_ACTIVE) > 0 && 2375 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2376 /* 2377 * We have active disks, launch provider if it doesn't 2378 * exist. 2379 */ 2380 if (sc->sc_provider == NULL) 2381 g_mirror_launch_provider(sc); 2382 if (sc->sc_rootmount != NULL) { 2383 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2384 __LINE__, sc->sc_rootmount); 2385 root_mount_rel(sc->sc_rootmount); 2386 sc->sc_rootmount = NULL; 2387 } 2388 } 2389 /* 2390 * Genid should be bumped immediately, so do it here. 2391 */ 2392 if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID) != 0) { 2393 sc->sc_bump_id &= ~G_MIRROR_BUMP_GENID; 2394 g_mirror_bump_genid(sc); 2395 } 2396 break; 2397 default: 2398 KASSERT(1 == 0, ("Wrong device state (%s, %s).", 2399 sc->sc_name, g_mirror_device_state2str(sc->sc_state))); 2400 break; 2401 } 2402} 2403 2404/* 2405 * Update disk state and device state if needed. 2406 */ 2407#define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \ 2408 "Disk %s state changed from %s to %s (device %s).", \ 2409 g_mirror_get_diskname(disk), \ 2410 g_mirror_disk_state2str(disk->d_state), \ 2411 g_mirror_disk_state2str(state), sc->sc_name) 2412static int 2413g_mirror_update_disk(struct g_mirror_disk *disk, u_int state) 2414{ 2415 struct g_mirror_softc *sc; 2416 2417 sc = disk->d_softc; 2418 sx_assert(&sc->sc_lock, SX_XLOCKED); 2419 2420again: 2421 G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.", 2422 g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state), 2423 g_mirror_disk_state2str(state)); 2424 switch (state) { 2425 case G_MIRROR_DISK_STATE_NEW: 2426 /* 2427 * Possible scenarios: 2428 * 1. New disk arrive. 2429 */ 2430 /* Previous state should be NONE. */ 2431 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE, 2432 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2433 g_mirror_disk_state2str(disk->d_state))); 2434 DISK_STATE_CHANGED(); 2435 2436 disk->d_state = state; 2437 if (LIST_EMPTY(&sc->sc_disks)) 2438 LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next); 2439 else { 2440 struct g_mirror_disk *dp; 2441 2442 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 2443 if (disk->d_priority >= dp->d_priority) { 2444 LIST_INSERT_BEFORE(dp, disk, d_next); 2445 dp = NULL; 2446 break; 2447 } 2448 if (LIST_NEXT(dp, d_next) == NULL) 2449 break; 2450 } 2451 if (dp != NULL) 2452 LIST_INSERT_AFTER(dp, disk, d_next); 2453 } 2454 G_MIRROR_DEBUG(1, "Device %s: provider %s detected.", 2455 sc->sc_name, g_mirror_get_diskname(disk)); 2456 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 2457 break; 2458 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2459 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2460 g_mirror_device_state2str(sc->sc_state), 2461 g_mirror_get_diskname(disk), 2462 g_mirror_disk_state2str(disk->d_state))); 2463 state = g_mirror_determine_state(disk); 2464 if (state != G_MIRROR_DISK_STATE_NONE) 2465 goto again; 2466 break; 2467 case G_MIRROR_DISK_STATE_ACTIVE: 2468 /* 2469 * Possible scenarios: 2470 * 1. New disk does not need synchronization. 2471 * 2. Synchronization process finished successfully. 2472 */ 2473 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2474 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2475 g_mirror_device_state2str(sc->sc_state), 2476 g_mirror_get_diskname(disk), 2477 g_mirror_disk_state2str(disk->d_state))); 2478 /* Previous state should be NEW or SYNCHRONIZING. */ 2479 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW || 2480 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2481 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2482 g_mirror_disk_state2str(disk->d_state))); 2483 DISK_STATE_CHANGED(); 2484 2485 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2486 disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2487 disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC; 2488 g_mirror_sync_stop(disk, 0); 2489 } 2490 disk->d_state = state; 2491 disk->d_sync.ds_offset = 0; 2492 disk->d_sync.ds_offset_done = 0; 2493 g_mirror_update_idle(sc, disk); 2494 g_mirror_update_metadata(disk); 2495 G_MIRROR_DEBUG(1, "Device %s: provider %s activated.", 2496 sc->sc_name, g_mirror_get_diskname(disk)); 2497 break; 2498 case G_MIRROR_DISK_STATE_STALE: 2499 /* 2500 * Possible scenarios: 2501 * 1. Stale disk was connected. 2502 */ 2503 /* Previous state should be NEW. */ 2504 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2505 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2506 g_mirror_disk_state2str(disk->d_state))); 2507 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2508 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2509 g_mirror_device_state2str(sc->sc_state), 2510 g_mirror_get_diskname(disk), 2511 g_mirror_disk_state2str(disk->d_state))); 2512 /* 2513 * STALE state is only possible if device is marked 2514 * NOAUTOSYNC. 2515 */ 2516 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0, 2517 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2518 g_mirror_device_state2str(sc->sc_state), 2519 g_mirror_get_diskname(disk), 2520 g_mirror_disk_state2str(disk->d_state))); 2521 DISK_STATE_CHANGED(); 2522 2523 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2524 disk->d_state = state; 2525 g_mirror_update_metadata(disk); 2526 G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.", 2527 sc->sc_name, g_mirror_get_diskname(disk)); 2528 break; 2529 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 2530 /* 2531 * Possible scenarios: 2532 * 1. Disk which needs synchronization was connected. 2533 */ 2534 /* Previous state should be NEW. */ 2535 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2536 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2537 g_mirror_disk_state2str(disk->d_state))); 2538 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2539 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2540 g_mirror_device_state2str(sc->sc_state), 2541 g_mirror_get_diskname(disk), 2542 g_mirror_disk_state2str(disk->d_state))); 2543 DISK_STATE_CHANGED(); 2544 2545 if (disk->d_state == G_MIRROR_DISK_STATE_NEW) 2546 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2547 disk->d_state = state; 2548 if (sc->sc_provider != NULL) { 2549 g_mirror_sync_start(disk); 2550 g_mirror_update_metadata(disk); 2551 } 2552 break; 2553 case G_MIRROR_DISK_STATE_DISCONNECTED: 2554 /* 2555 * Possible scenarios: 2556 * 1. Device wasn't running yet, but disk disappear. 2557 * 2. Disk was active and disapppear. 2558 * 3. Disk disappear during synchronization process. 2559 */ 2560 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) { 2561 /* 2562 * Previous state should be ACTIVE, STALE or 2563 * SYNCHRONIZING. 2564 */ 2565 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 2566 disk->d_state == G_MIRROR_DISK_STATE_STALE || 2567 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2568 ("Wrong disk state (%s, %s).", 2569 g_mirror_get_diskname(disk), 2570 g_mirror_disk_state2str(disk->d_state))); 2571 } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) { 2572 /* Previous state should be NEW. */ 2573 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2574 ("Wrong disk state (%s, %s).", 2575 g_mirror_get_diskname(disk), 2576 g_mirror_disk_state2str(disk->d_state))); 2577 /* 2578 * Reset bumping syncid if disk disappeared in STARTING 2579 * state. 2580 */ 2581 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) 2582 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 2583#ifdef INVARIANTS 2584 } else { 2585 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).", 2586 sc->sc_name, 2587 g_mirror_device_state2str(sc->sc_state), 2588 g_mirror_get_diskname(disk), 2589 g_mirror_disk_state2str(disk->d_state))); 2590#endif 2591 } 2592 DISK_STATE_CHANGED(); 2593 G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.", 2594 sc->sc_name, g_mirror_get_diskname(disk)); 2595 2596 g_mirror_destroy_disk(disk); 2597 break; 2598 case G_MIRROR_DISK_STATE_DESTROY: 2599 { 2600 int error; 2601 2602 error = g_mirror_clear_metadata(disk); 2603 if (error != 0) 2604 return (error); 2605 DISK_STATE_CHANGED(); 2606 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", 2607 sc->sc_name, g_mirror_get_diskname(disk)); 2608 2609 g_mirror_destroy_disk(disk); 2610 sc->sc_ndisks--; 2611 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2612 g_mirror_update_metadata(disk); 2613 } 2614 break; 2615 } 2616 default: 2617 KASSERT(1 == 0, ("Unknown state (%u).", state)); 2618 break; 2619 } 2620 return (0); 2621} 2622#undef DISK_STATE_CHANGED 2623 2624int 2625g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md) 2626{ 2627 struct g_provider *pp; 2628 u_char *buf; 2629 int error; 2630 2631 g_topology_assert(); 2632 2633 error = g_access(cp, 1, 0, 0); 2634 if (error != 0) 2635 return (error); 2636 pp = cp->provider; 2637 g_topology_unlock(); 2638 /* Metadata are stored on last sector. */ 2639 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 2640 &error); 2641 g_topology_lock(); 2642 g_access(cp, -1, 0, 0); 2643 if (buf == NULL) { 2644 G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).", 2645 cp->provider->name, error); 2646 return (error); 2647 } 2648 2649 /* Decode metadata. */ 2650 error = mirror_metadata_decode(buf, md); 2651 g_free(buf); 2652 if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0) 2653 return (EINVAL); 2654 if (md->md_version > G_MIRROR_VERSION) { 2655 G_MIRROR_DEBUG(0, 2656 "Kernel module is too old to handle metadata from %s.", 2657 cp->provider->name); 2658 return (EINVAL); 2659 } 2660 if (error != 0) { 2661 G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.", 2662 cp->provider->name); 2663 return (error); 2664 } 2665 2666 return (0); 2667} 2668 2669static int 2670g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp, 2671 struct g_mirror_metadata *md) 2672{ 2673 2674 if (g_mirror_id2disk(sc, md->md_did) != NULL) { 2675 G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.", 2676 pp->name, md->md_did); 2677 return (EEXIST); 2678 } 2679 if (md->md_all != sc->sc_ndisks) { 2680 G_MIRROR_DEBUG(1, 2681 "Invalid '%s' field on disk %s (device %s), skipping.", 2682 "md_all", pp->name, sc->sc_name); 2683 return (EINVAL); 2684 } 2685 if (md->md_slice != sc->sc_slice) { 2686 G_MIRROR_DEBUG(1, 2687 "Invalid '%s' field on disk %s (device %s), skipping.", 2688 "md_slice", pp->name, sc->sc_name); 2689 return (EINVAL); 2690 } 2691 if (md->md_balance != sc->sc_balance) { 2692 G_MIRROR_DEBUG(1, 2693 "Invalid '%s' field on disk %s (device %s), skipping.", 2694 "md_balance", pp->name, sc->sc_name); 2695 return (EINVAL); 2696 } 2697 if (md->md_mediasize != sc->sc_mediasize) { 2698 G_MIRROR_DEBUG(1, 2699 "Invalid '%s' field on disk %s (device %s), skipping.", 2700 "md_mediasize", pp->name, sc->sc_name); 2701 return (EINVAL); 2702 } 2703 if (sc->sc_mediasize > pp->mediasize) { 2704 G_MIRROR_DEBUG(1, 2705 "Invalid size of disk %s (device %s), skipping.", pp->name, 2706 sc->sc_name); 2707 return (EINVAL); 2708 } 2709 if (md->md_sectorsize != sc->sc_sectorsize) { 2710 G_MIRROR_DEBUG(1, 2711 "Invalid '%s' field on disk %s (device %s), skipping.", 2712 "md_sectorsize", pp->name, sc->sc_name); 2713 return (EINVAL); 2714 } 2715 if ((sc->sc_sectorsize % pp->sectorsize) != 0) { 2716 G_MIRROR_DEBUG(1, 2717 "Invalid sector size of disk %s (device %s), skipping.", 2718 pp->name, sc->sc_name); 2719 return (EINVAL); 2720 } 2721 if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) { 2722 G_MIRROR_DEBUG(1, 2723 "Invalid device flags on disk %s (device %s), skipping.", 2724 pp->name, sc->sc_name); 2725 return (EINVAL); 2726 } 2727 if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) { 2728 G_MIRROR_DEBUG(1, 2729 "Invalid disk flags on disk %s (device %s), skipping.", 2730 pp->name, sc->sc_name); 2731 return (EINVAL); 2732 } 2733 return (0); 2734} 2735 2736int 2737g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp, 2738 struct g_mirror_metadata *md) 2739{ 2740 struct g_mirror_disk *disk; 2741 int error; 2742 2743 g_topology_assert_not(); 2744 G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name); 2745 2746 error = g_mirror_check_metadata(sc, pp, md); 2747 if (error != 0) 2748 return (error); 2749 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING && 2750 md->md_genid < sc->sc_genid) { 2751 G_MIRROR_DEBUG(0, "Component %s (device %s) broken, skipping.", 2752 pp->name, sc->sc_name); 2753 return (EINVAL); 2754 } 2755 disk = g_mirror_init_disk(sc, pp, md, &error); 2756 if (disk == NULL) 2757 return (error); 2758 error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW, 2759 G_MIRROR_EVENT_WAIT); 2760 if (error != 0) 2761 return (error); 2762 if (md->md_version < G_MIRROR_VERSION) { 2763 G_MIRROR_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).", 2764 pp->name, md->md_version, G_MIRROR_VERSION); 2765 g_mirror_update_metadata(disk); 2766 } 2767 return (0); 2768} 2769 2770static void 2771g_mirror_destroy_delayed(void *arg, int flag) 2772{ 2773 struct g_mirror_softc *sc; 2774 int error; 2775 2776 if (flag == EV_CANCEL) { 2777 G_MIRROR_DEBUG(1, "Destroying canceled."); 2778 return; 2779 } 2780 sc = arg; 2781 g_topology_unlock(); 2782 sx_xlock(&sc->sc_lock); 2783 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) == 0, 2784 ("DESTROY flag set on %s.", sc->sc_name)); 2785 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0, 2786 ("DESTROYING flag not set on %s.", sc->sc_name)); 2787 G_MIRROR_DEBUG(1, "Destroying %s (delayed).", sc->sc_name); 2788 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_SOFT); 2789 if (error != 0) { 2790 G_MIRROR_DEBUG(0, "Cannot destroy %s.", sc->sc_name); 2791 sx_xunlock(&sc->sc_lock); 2792 } 2793 g_topology_lock(); 2794} 2795 2796static int 2797g_mirror_access(struct g_provider *pp, int acr, int acw, int ace) 2798{ 2799 struct g_mirror_softc *sc; 2800 int dcr, dcw, dce, error = 0; 2801 2802 g_topology_assert(); 2803 G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr, 2804 acw, ace); 2805 2806 sc = pp->geom->softc; 2807 if (sc == NULL && acr <= 0 && acw <= 0 && ace <= 0) 2808 return (0); 2809 KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name)); 2810 2811 dcr = pp->acr + acr; 2812 dcw = pp->acw + acw; 2813 dce = pp->ace + ace; 2814 2815 g_topology_unlock(); 2816 sx_xlock(&sc->sc_lock); 2817 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0 || 2818 LIST_EMPTY(&sc->sc_disks)) { 2819 if (acr > 0 || acw > 0 || ace > 0) 2820 error = ENXIO; 2821 goto end; 2822 } 2823 if (dcw == 0 && !sc->sc_idle) 2824 g_mirror_idle(sc, dcw); 2825 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0) { 2826 if (acr > 0 || acw > 0 || ace > 0) { 2827 error = ENXIO; 2828 goto end; 2829 } 2830 if (dcr == 0 && dcw == 0 && dce == 0) { 2831 g_post_event(g_mirror_destroy_delayed, sc, M_WAITOK, 2832 sc, NULL); 2833 } 2834 } 2835end: 2836 sx_xunlock(&sc->sc_lock); 2837 g_topology_lock(); 2838 return (error); 2839} 2840 2841static struct g_geom * 2842g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md) 2843{ 2844 struct g_mirror_softc *sc; 2845 struct g_geom *gp; 2846 int error, timeout; 2847 2848 g_topology_assert(); 2849 G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name, 2850 md->md_mid); 2851 2852 /* One disk is minimum. */ 2853 if (md->md_all < 1) 2854 return (NULL); 2855 /* 2856 * Action geom. 2857 */ 2858 gp = g_new_geomf(mp, "%s", md->md_name); 2859 sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO); 2860 gp->start = g_mirror_start; 2861 gp->orphan = g_mirror_orphan; 2862 gp->access = g_mirror_access; 2863 gp->dumpconf = g_mirror_dumpconf; 2864 2865 sc->sc_id = md->md_mid; 2866 sc->sc_slice = md->md_slice; 2867 sc->sc_balance = md->md_balance; 2868 sc->sc_mediasize = md->md_mediasize; 2869 sc->sc_sectorsize = md->md_sectorsize; 2870 sc->sc_ndisks = md->md_all; 2871 sc->sc_flags = md->md_mflags; 2872 sc->sc_bump_id = 0; 2873 sc->sc_idle = 1; 2874 sc->sc_last_write = time_uptime; 2875 sc->sc_writes = 0; 2876 sx_init(&sc->sc_lock, "gmirror:lock"); 2877 bioq_init(&sc->sc_queue); 2878 mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF); 2879 bioq_init(&sc->sc_regular_delayed); 2880 bioq_init(&sc->sc_inflight); 2881 bioq_init(&sc->sc_sync_delayed); 2882 LIST_INIT(&sc->sc_disks); 2883 TAILQ_INIT(&sc->sc_events); 2884 mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF); 2885 callout_init(&sc->sc_callout, CALLOUT_MPSAFE); 2886 sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING; 2887 gp->softc = sc; 2888 sc->sc_geom = gp; 2889 sc->sc_provider = NULL; 2890 /* 2891 * Synchronization geom. 2892 */ 2893 gp = g_new_geomf(mp, "%s.sync", md->md_name); 2894 gp->softc = sc; 2895 gp->orphan = g_mirror_orphan; 2896 sc->sc_sync.ds_geom = gp; 2897 sc->sc_sync.ds_ndisks = 0; 2898 error = kproc_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0, 2899 "g_mirror %s", md->md_name); 2900 if (error != 0) { 2901 G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.", 2902 sc->sc_name); 2903 g_destroy_geom(sc->sc_sync.ds_geom); 2904 mtx_destroy(&sc->sc_events_mtx); 2905 mtx_destroy(&sc->sc_queue_mtx); 2906 sx_destroy(&sc->sc_lock); 2907 g_destroy_geom(sc->sc_geom); 2908 free(sc, M_MIRROR); 2909 return (NULL); 2910 } 2911 2912 G_MIRROR_DEBUG(1, "Device %s created (%u components, id=%u).", 2913 sc->sc_name, sc->sc_ndisks, sc->sc_id); 2914 2915 sc->sc_rootmount = root_mount_hold("GMIRROR"); 2916 G_MIRROR_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount); 2917 /* 2918 * Run timeout. 2919 */ 2920 timeout = g_mirror_timeout * hz; 2921 callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc); 2922 return (sc->sc_geom); 2923} 2924 2925int 2926g_mirror_destroy(struct g_mirror_softc *sc, int how) 2927{ 2928 struct g_mirror_disk *disk; 2929 struct g_provider *pp; 2930 2931 g_topology_assert_not(); 2932 if (sc == NULL) 2933 return (ENXIO); 2934 sx_assert(&sc->sc_lock, SX_XLOCKED); 2935 2936 pp = sc->sc_provider; 2937 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 2938 switch (how) { 2939 case G_MIRROR_DESTROY_SOFT: 2940 G_MIRROR_DEBUG(1, 2941 "Device %s is still open (r%dw%de%d).", pp->name, 2942 pp->acr, pp->acw, pp->ace); 2943 return (EBUSY); 2944 case G_MIRROR_DESTROY_DELAYED: 2945 G_MIRROR_DEBUG(1, 2946 "Device %s will be destroyed on last close.", 2947 pp->name); 2948 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2949 if (disk->d_state == 2950 G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2951 g_mirror_sync_stop(disk, 1); 2952 } 2953 } 2954 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROYING; 2955 return (EBUSY); 2956 case G_MIRROR_DESTROY_HARD: 2957 G_MIRROR_DEBUG(1, "Device %s is still open, so it " 2958 "can't be definitely removed.", pp->name); 2959 } 2960 } 2961 2962 g_topology_lock(); 2963 if (sc->sc_geom->softc == NULL) { 2964 g_topology_unlock(); 2965 return (0); 2966 } 2967 sc->sc_geom->softc = NULL; 2968 sc->sc_sync.ds_geom->softc = NULL; 2969 g_topology_unlock(); 2970 2971 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2972 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_WAIT; 2973 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 2974 sx_xunlock(&sc->sc_lock); 2975 mtx_lock(&sc->sc_queue_mtx); 2976 wakeup(sc); 2977 mtx_unlock(&sc->sc_queue_mtx); 2978 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker); 2979 while (sc->sc_worker != NULL) 2980 tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5); 2981 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker); 2982 sx_xlock(&sc->sc_lock); 2983 g_mirror_destroy_device(sc); 2984 free(sc, M_MIRROR); 2985 return (0); 2986} 2987 2988static void 2989g_mirror_taste_orphan(struct g_consumer *cp) 2990{ 2991 2992 KASSERT(1 == 0, ("%s called while tasting %s.", __func__, 2993 cp->provider->name)); 2994} 2995 2996static struct g_geom * 2997g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 2998{ 2999 struct g_mirror_metadata md; 3000 struct g_mirror_softc *sc; 3001 struct g_consumer *cp; 3002 struct g_geom *gp; 3003 int error; 3004 3005 g_topology_assert(); 3006 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 3007 G_MIRROR_DEBUG(2, "Tasting %s.", pp->name); 3008 3009 gp = g_new_geomf(mp, "mirror:taste"); 3010 /* 3011 * This orphan function should be never called. 3012 */ 3013 gp->orphan = g_mirror_taste_orphan; 3014 cp = g_new_consumer(gp); 3015 g_attach(cp, pp); 3016 error = g_mirror_read_metadata(cp, &md); 3017 g_detach(cp); 3018 g_destroy_consumer(cp); 3019 g_destroy_geom(gp); 3020 if (error != 0) 3021 return (NULL); 3022 gp = NULL; 3023 3024 if (md.md_provider[0] != '\0' && strcmp(md.md_provider, pp->name) != 0) 3025 return (NULL); 3026 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize) 3027 return (NULL); 3028 if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) { 3029 G_MIRROR_DEBUG(0, 3030 "Device %s: provider %s marked as inactive, skipping.", 3031 md.md_name, pp->name); 3032 return (NULL); 3033 } 3034 if (g_mirror_debug >= 2) 3035 mirror_metadata_dump(&md); 3036 3037 /* 3038 * Let's check if device already exists. 3039 */ 3040 sc = NULL; 3041 LIST_FOREACH(gp, &mp->geom, geom) { 3042 sc = gp->softc; 3043 if (sc == NULL) 3044 continue; 3045 if (sc->sc_sync.ds_geom == gp) 3046 continue; 3047 if (strcmp(md.md_name, sc->sc_name) != 0) 3048 continue; 3049 if (md.md_mid != sc->sc_id) { 3050 G_MIRROR_DEBUG(0, "Device %s already configured.", 3051 sc->sc_name); 3052 return (NULL); 3053 } 3054 break; 3055 } 3056 if (gp == NULL) { 3057 gp = g_mirror_create(mp, &md); 3058 if (gp == NULL) { 3059 G_MIRROR_DEBUG(0, "Cannot create device %s.", 3060 md.md_name); 3061 return (NULL); 3062 } 3063 sc = gp->softc; 3064 } 3065 G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name); 3066 g_topology_unlock(); 3067 sx_xlock(&sc->sc_lock); 3068 error = g_mirror_add_disk(sc, pp, &md); 3069 if (error != 0) { 3070 G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).", 3071 pp->name, gp->name, error); 3072 if (LIST_EMPTY(&sc->sc_disks)) { 3073 g_cancel_event(sc); 3074 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3075 g_topology_lock(); 3076 return (NULL); 3077 } 3078 gp = NULL; 3079 } 3080 sx_xunlock(&sc->sc_lock); 3081 g_topology_lock(); 3082 return (gp); 3083} 3084 3085static int 3086g_mirror_destroy_geom(struct gctl_req *req __unused, 3087 struct g_class *mp __unused, struct g_geom *gp) 3088{ 3089 struct g_mirror_softc *sc; 3090 int error; 3091 3092 g_topology_unlock(); 3093 sc = gp->softc; 3094 sx_xlock(&sc->sc_lock); 3095 g_cancel_event(sc); 3096 error = g_mirror_destroy(gp->softc, G_MIRROR_DESTROY_SOFT); 3097 if (error != 0) 3098 sx_xunlock(&sc->sc_lock); 3099 g_topology_lock(); 3100 return (error); 3101} 3102 3103static void 3104g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 3105 struct g_consumer *cp, struct g_provider *pp) 3106{ 3107 struct g_mirror_softc *sc; 3108 3109 g_topology_assert(); 3110 3111 sc = gp->softc; 3112 if (sc == NULL) 3113 return; 3114 /* Skip synchronization geom. */ 3115 if (gp == sc->sc_sync.ds_geom) 3116 return; 3117 if (pp != NULL) { 3118 /* Nothing here. */ 3119 } else if (cp != NULL) { 3120 struct g_mirror_disk *disk; 3121 3122 disk = cp->private; 3123 if (disk == NULL) 3124 return; 3125 g_topology_unlock(); 3126 sx_xlock(&sc->sc_lock); 3127 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id); 3128 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3129 sbuf_printf(sb, "%s<Synchronized>", indent); 3130 if (disk->d_sync.ds_offset == 0) 3131 sbuf_printf(sb, "0%%"); 3132 else { 3133 sbuf_printf(sb, "%u%%", 3134 (u_int)((disk->d_sync.ds_offset * 100) / 3135 sc->sc_provider->mediasize)); 3136 } 3137 sbuf_printf(sb, "</Synchronized>\n"); 3138 } 3139 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, 3140 disk->d_sync.ds_syncid); 3141 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, 3142 disk->d_genid); 3143 sbuf_printf(sb, "%s<Flags>", indent); 3144 if (disk->d_flags == 0) 3145 sbuf_printf(sb, "NONE"); 3146 else { 3147 int first = 1; 3148 3149#define ADD_FLAG(flag, name) do { \ 3150 if ((disk->d_flags & (flag)) != 0) { \ 3151 if (!first) \ 3152 sbuf_printf(sb, ", "); \ 3153 else \ 3154 first = 0; \ 3155 sbuf_printf(sb, name); \ 3156 } \ 3157} while (0) 3158 ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY"); 3159 ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED"); 3160 ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE"); 3161 ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING, 3162 "SYNCHRONIZING"); 3163 ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC"); 3164 ADD_FLAG(G_MIRROR_DISK_FLAG_BROKEN, "BROKEN"); 3165#undef ADD_FLAG 3166 } 3167 sbuf_printf(sb, "</Flags>\n"); 3168 sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent, 3169 disk->d_priority); 3170 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 3171 g_mirror_disk_state2str(disk->d_state)); 3172 sx_xunlock(&sc->sc_lock); 3173 g_topology_lock(); 3174 } else { 3175 g_topology_unlock(); 3176 sx_xlock(&sc->sc_lock); 3177 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id); 3178 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid); 3179 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid); 3180 sbuf_printf(sb, "%s<Flags>", indent); 3181 if (sc->sc_flags == 0) 3182 sbuf_printf(sb, "NONE"); 3183 else { 3184 int first = 1; 3185 3186#define ADD_FLAG(flag, name) do { \ 3187 if ((sc->sc_flags & (flag)) != 0) { \ 3188 if (!first) \ 3189 sbuf_printf(sb, ", "); \ 3190 else \ 3191 first = 0; \ 3192 sbuf_printf(sb, name); \ 3193 } \ 3194} while (0) 3195 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC"); 3196 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC"); 3197#undef ADD_FLAG 3198 } 3199 sbuf_printf(sb, "</Flags>\n"); 3200 sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent, 3201 (u_int)sc->sc_slice); 3202 sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent, 3203 balance_name(sc->sc_balance)); 3204 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent, 3205 sc->sc_ndisks); 3206 sbuf_printf(sb, "%s<State>", indent); 3207 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 3208 sbuf_printf(sb, "%s", "STARTING"); 3209 else if (sc->sc_ndisks == 3210 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE)) 3211 sbuf_printf(sb, "%s", "COMPLETE"); 3212 else 3213 sbuf_printf(sb, "%s", "DEGRADED"); 3214 sbuf_printf(sb, "</State>\n"); 3215 sx_xunlock(&sc->sc_lock); 3216 g_topology_lock(); 3217 } 3218} 3219 3220static void 3221g_mirror_shutdown_pre_sync(void *arg, int howto) 3222{ 3223 struct g_class *mp; 3224 struct g_geom *gp, *gp2; 3225 struct g_mirror_softc *sc; 3226 int error; 3227 3228 mp = arg; 3229 DROP_GIANT(); 3230 g_topology_lock(); 3231 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 3232 if ((sc = gp->softc) == NULL) 3233 continue; 3234 /* Skip synchronization geom. */ 3235 if (gp == sc->sc_sync.ds_geom) 3236 continue; 3237 g_topology_unlock(); 3238 sx_xlock(&sc->sc_lock); 3239 g_cancel_event(sc); 3240 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_DELAYED); 3241 if (error != 0) 3242 sx_xunlock(&sc->sc_lock); 3243 g_topology_lock(); 3244 } 3245 g_topology_unlock(); 3246 PICKUP_GIANT(); 3247} 3248 3249static void 3250g_mirror_init(struct g_class *mp) 3251{ 3252 3253 g_mirror_pre_sync = EVENTHANDLER_REGISTER(shutdown_pre_sync, 3254 g_mirror_shutdown_pre_sync, mp, SHUTDOWN_PRI_FIRST); 3255 if (g_mirror_pre_sync == NULL) 3256 G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event."); 3257} 3258 3259static void 3260g_mirror_fini(struct g_class *mp) 3261{ 3262 3263 if (g_mirror_pre_sync != NULL) 3264 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, g_mirror_pre_sync); 3265} 3266 3267DECLARE_GEOM_CLASS(g_mirror_class, g_mirror); 3268