1/*- 2 * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: stable/10/sys/geom/mirror/g_mirror.c 324589 2017-10-13 09:14:05Z avg $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/kernel.h> 33#include <sys/module.h> 34#include <sys/limits.h> 35#include <sys/lock.h> 36#include <sys/mutex.h> 37#include <sys/bio.h> 38#include <sys/sbuf.h> 39#include <sys/sysctl.h> 40#include <sys/malloc.h> 41#include <sys/eventhandler.h> 42#include <vm/uma.h> 43#include <geom/geom.h> 44#include <sys/proc.h> 45#include <sys/kthread.h> 46#include <sys/sched.h> 47#include <geom/mirror/g_mirror.h> 48 49FEATURE(geom_mirror, "GEOM mirroring support"); 50 51static MALLOC_DEFINE(M_MIRROR, "mirror_data", "GEOM_MIRROR Data"); 52 53SYSCTL_DECL(_kern_geom); 54static SYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW, 0, 55 "GEOM_MIRROR stuff"); 56u_int g_mirror_debug = 0; 57TUNABLE_INT("kern.geom.mirror.debug", &g_mirror_debug); 58SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RW, &g_mirror_debug, 0, 59 "Debug level"); 60static u_int g_mirror_timeout = 4; 61TUNABLE_INT("kern.geom.mirror.timeout", &g_mirror_timeout); 62SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RW, &g_mirror_timeout, 63 0, "Time to wait on all mirror components"); 64static u_int g_mirror_idletime = 5; 65TUNABLE_INT("kern.geom.mirror.idletime", &g_mirror_idletime); 66SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, idletime, CTLFLAG_RW, 67 &g_mirror_idletime, 0, "Mark components as clean when idling"); 68static u_int g_mirror_disconnect_on_failure = 1; 69TUNABLE_INT("kern.geom.mirror.disconnect_on_failure", 70 &g_mirror_disconnect_on_failure); 71SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, disconnect_on_failure, CTLFLAG_RW, 72 &g_mirror_disconnect_on_failure, 0, "Disconnect component on I/O failure."); 73static u_int g_mirror_syncreqs = 2; 74TUNABLE_INT("kern.geom.mirror.sync_requests", &g_mirror_syncreqs); 75SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_requests, CTLFLAG_RDTUN, 76 &g_mirror_syncreqs, 0, "Parallel synchronization I/O requests."); 77 78#define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \ 79 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \ 80 msleep((ident), (mtx), (priority), (wmesg), (timeout)); \ 81 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \ 82} while (0) 83 84static eventhandler_tag g_mirror_post_sync = NULL; 85static int g_mirror_shutdown = 0; 86 87static g_ctl_destroy_geom_t g_mirror_destroy_geom; 88static g_taste_t g_mirror_taste; 89static g_init_t g_mirror_init; 90static g_fini_t g_mirror_fini; 91static g_provgone_t g_mirror_providergone; 92static g_resize_t g_mirror_resize; 93 94struct g_class g_mirror_class = { 95 .name = G_MIRROR_CLASS_NAME, 96 .version = G_VERSION, 97 .ctlreq = g_mirror_config, 98 .taste = g_mirror_taste, 99 .destroy_geom = g_mirror_destroy_geom, 100 .init = g_mirror_init, 101 .fini = g_mirror_fini, 102 .providergone = g_mirror_providergone, 103 .resize = g_mirror_resize 104}; 105 106 107static void g_mirror_destroy_provider(struct g_mirror_softc *sc); 108static int g_mirror_update_disk(struct g_mirror_disk *disk, u_int state); 109static void g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force); 110static void g_mirror_dumpconf(struct sbuf *sb, const char *indent, 111 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp); 112static void g_mirror_sync_stop(struct g_mirror_disk *disk, int type); 113static void g_mirror_register_request(struct bio *bp); 114static void g_mirror_sync_release(struct g_mirror_softc *sc); 115 116 117static const char * 118g_mirror_disk_state2str(int state) 119{ 120 121 switch (state) { 122 case G_MIRROR_DISK_STATE_NONE: 123 return ("NONE"); 124 case G_MIRROR_DISK_STATE_NEW: 125 return ("NEW"); 126 case G_MIRROR_DISK_STATE_ACTIVE: 127 return ("ACTIVE"); 128 case G_MIRROR_DISK_STATE_STALE: 129 return ("STALE"); 130 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 131 return ("SYNCHRONIZING"); 132 case G_MIRROR_DISK_STATE_DISCONNECTED: 133 return ("DISCONNECTED"); 134 case G_MIRROR_DISK_STATE_DESTROY: 135 return ("DESTROY"); 136 default: 137 return ("INVALID"); 138 } 139} 140 141static const char * 142g_mirror_device_state2str(int state) 143{ 144 145 switch (state) { 146 case G_MIRROR_DEVICE_STATE_STARTING: 147 return ("STARTING"); 148 case G_MIRROR_DEVICE_STATE_RUNNING: 149 return ("RUNNING"); 150 default: 151 return ("INVALID"); 152 } 153} 154 155static const char * 156g_mirror_get_diskname(struct g_mirror_disk *disk) 157{ 158 159 if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL) 160 return ("[unknown]"); 161 return (disk->d_name); 162} 163 164/* 165 * --- Events handling functions --- 166 * Events in geom_mirror are used to maintain disks and device status 167 * from one thread to simplify locking. 168 */ 169static void 170g_mirror_event_free(struct g_mirror_event *ep) 171{ 172 173 free(ep, M_MIRROR); 174} 175 176int 177g_mirror_event_send(void *arg, int state, int flags) 178{ 179 struct g_mirror_softc *sc; 180 struct g_mirror_disk *disk; 181 struct g_mirror_event *ep; 182 int error; 183 184 ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK); 185 G_MIRROR_DEBUG(4, "%s: Sending event %p.", __func__, ep); 186 if ((flags & G_MIRROR_EVENT_DEVICE) != 0) { 187 disk = NULL; 188 sc = arg; 189 } else { 190 disk = arg; 191 sc = disk->d_softc; 192 } 193 ep->e_disk = disk; 194 ep->e_state = state; 195 ep->e_flags = flags; 196 ep->e_error = 0; 197 mtx_lock(&sc->sc_events_mtx); 198 TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next); 199 mtx_unlock(&sc->sc_events_mtx); 200 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 201 mtx_lock(&sc->sc_queue_mtx); 202 wakeup(sc); 203 mtx_unlock(&sc->sc_queue_mtx); 204 if ((flags & G_MIRROR_EVENT_DONTWAIT) != 0) 205 return (0); 206 sx_assert(&sc->sc_lock, SX_XLOCKED); 207 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep); 208 sx_xunlock(&sc->sc_lock); 209 while ((ep->e_flags & G_MIRROR_EVENT_DONE) == 0) { 210 mtx_lock(&sc->sc_events_mtx); 211 MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "m:event", 212 hz * 5); 213 } 214 error = ep->e_error; 215 g_mirror_event_free(ep); 216 sx_xlock(&sc->sc_lock); 217 return (error); 218} 219 220static struct g_mirror_event * 221g_mirror_event_get(struct g_mirror_softc *sc) 222{ 223 struct g_mirror_event *ep; 224 225 mtx_lock(&sc->sc_events_mtx); 226 ep = TAILQ_FIRST(&sc->sc_events); 227 mtx_unlock(&sc->sc_events_mtx); 228 return (ep); 229} 230 231static void 232g_mirror_event_remove(struct g_mirror_softc *sc, struct g_mirror_event *ep) 233{ 234 235 mtx_lock(&sc->sc_events_mtx); 236 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 237 mtx_unlock(&sc->sc_events_mtx); 238} 239 240static void 241g_mirror_event_cancel(struct g_mirror_disk *disk) 242{ 243 struct g_mirror_softc *sc; 244 struct g_mirror_event *ep, *tmpep; 245 246 sc = disk->d_softc; 247 sx_assert(&sc->sc_lock, SX_XLOCKED); 248 249 mtx_lock(&sc->sc_events_mtx); 250 TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) { 251 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) 252 continue; 253 if (ep->e_disk != disk) 254 continue; 255 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 256 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 257 g_mirror_event_free(ep); 258 else { 259 ep->e_error = ECANCELED; 260 wakeup(ep); 261 } 262 } 263 mtx_unlock(&sc->sc_events_mtx); 264} 265 266/* 267 * Return the number of disks in given state. 268 * If state is equal to -1, count all connected disks. 269 */ 270u_int 271g_mirror_ndisks(struct g_mirror_softc *sc, int state) 272{ 273 struct g_mirror_disk *disk; 274 u_int n = 0; 275 276 sx_assert(&sc->sc_lock, SX_LOCKED); 277 278 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 279 if (state == -1 || disk->d_state == state) 280 n++; 281 } 282 return (n); 283} 284 285/* 286 * Find a disk in mirror by its disk ID. 287 */ 288static struct g_mirror_disk * 289g_mirror_id2disk(struct g_mirror_softc *sc, uint32_t id) 290{ 291 struct g_mirror_disk *disk; 292 293 sx_assert(&sc->sc_lock, SX_XLOCKED); 294 295 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 296 if (disk->d_id == id) 297 return (disk); 298 } 299 return (NULL); 300} 301 302static u_int 303g_mirror_nrequests(struct g_mirror_softc *sc, struct g_consumer *cp) 304{ 305 struct bio *bp; 306 u_int nreqs = 0; 307 308 mtx_lock(&sc->sc_queue_mtx); 309 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) { 310 if (bp->bio_from == cp) 311 nreqs++; 312 } 313 mtx_unlock(&sc->sc_queue_mtx); 314 return (nreqs); 315} 316 317static int 318g_mirror_is_busy(struct g_mirror_softc *sc, struct g_consumer *cp) 319{ 320 321 if (cp->index > 0) { 322 G_MIRROR_DEBUG(2, 323 "I/O requests for %s exist, can't destroy it now.", 324 cp->provider->name); 325 return (1); 326 } 327 if (g_mirror_nrequests(sc, cp) > 0) { 328 G_MIRROR_DEBUG(2, 329 "I/O requests for %s in queue, can't destroy it now.", 330 cp->provider->name); 331 return (1); 332 } 333 return (0); 334} 335 336static void 337g_mirror_destroy_consumer(void *arg, int flags __unused) 338{ 339 struct g_consumer *cp; 340 341 g_topology_assert(); 342 343 cp = arg; 344 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", cp->provider->name); 345 g_detach(cp); 346 g_destroy_consumer(cp); 347} 348 349static void 350g_mirror_kill_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 351{ 352 struct g_provider *pp; 353 int retaste_wait; 354 355 g_topology_assert(); 356 357 cp->private = NULL; 358 if (g_mirror_is_busy(sc, cp)) 359 return; 360 pp = cp->provider; 361 retaste_wait = 0; 362 if (cp->acw == 1) { 363 if ((pp->geom->flags & G_GEOM_WITHER) == 0) 364 retaste_wait = 1; 365 } 366 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", pp->name, -cp->acr, 367 -cp->acw, -cp->ace, 0); 368 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 369 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 370 if (retaste_wait) { 371 /* 372 * After retaste event was send (inside g_access()), we can send 373 * event to detach and destroy consumer. 374 * A class, which has consumer to the given provider connected 375 * will not receive retaste event for the provider. 376 * This is the way how I ignore retaste events when I close 377 * consumers opened for write: I detach and destroy consumer 378 * after retaste event is sent. 379 */ 380 g_post_event(g_mirror_destroy_consumer, cp, M_WAITOK, NULL); 381 return; 382 } 383 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", pp->name); 384 g_detach(cp); 385 g_destroy_consumer(cp); 386} 387 388static int 389g_mirror_connect_disk(struct g_mirror_disk *disk, struct g_provider *pp) 390{ 391 struct g_consumer *cp; 392 int error; 393 394 g_topology_assert_not(); 395 KASSERT(disk->d_consumer == NULL, 396 ("Disk already connected (device %s).", disk->d_softc->sc_name)); 397 398 g_topology_lock(); 399 cp = g_new_consumer(disk->d_softc->sc_geom); 400 cp->flags |= G_CF_DIRECT_RECEIVE; 401 error = g_attach(cp, pp); 402 if (error != 0) { 403 g_destroy_consumer(cp); 404 g_topology_unlock(); 405 return (error); 406 } 407 error = g_access(cp, 1, 1, 1); 408 if (error != 0) { 409 g_detach(cp); 410 g_destroy_consumer(cp); 411 g_topology_unlock(); 412 G_MIRROR_DEBUG(0, "Cannot open consumer %s (error=%d).", 413 pp->name, error); 414 return (error); 415 } 416 g_topology_unlock(); 417 disk->d_consumer = cp; 418 disk->d_consumer->private = disk; 419 disk->d_consumer->index = 0; 420 421 G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk)); 422 return (0); 423} 424 425static void 426g_mirror_disconnect_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 427{ 428 429 g_topology_assert(); 430 431 if (cp == NULL) 432 return; 433 if (cp->provider != NULL) 434 g_mirror_kill_consumer(sc, cp); 435 else 436 g_destroy_consumer(cp); 437} 438 439/* 440 * Initialize disk. This means allocate memory, create consumer, attach it 441 * to the provider and open access (r1w1e1) to it. 442 */ 443static struct g_mirror_disk * 444g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp, 445 struct g_mirror_metadata *md, int *errorp) 446{ 447 struct g_mirror_disk *disk; 448 int i, error; 449 450 disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO); 451 if (disk == NULL) { 452 error = ENOMEM; 453 goto fail; 454 } 455 disk->d_softc = sc; 456 error = g_mirror_connect_disk(disk, pp); 457 if (error != 0) 458 goto fail; 459 disk->d_id = md->md_did; 460 disk->d_state = G_MIRROR_DISK_STATE_NONE; 461 disk->d_priority = md->md_priority; 462 disk->d_flags = md->md_dflags; 463 error = g_getattr("GEOM::candelete", disk->d_consumer, &i); 464 if (error == 0 && i != 0) 465 disk->d_flags |= G_MIRROR_DISK_FLAG_CANDELETE; 466 if (md->md_provider[0] != '\0') 467 disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED; 468 disk->d_sync.ds_consumer = NULL; 469 disk->d_sync.ds_offset = md->md_sync_offset; 470 disk->d_sync.ds_offset_done = md->md_sync_offset; 471 disk->d_genid = md->md_genid; 472 disk->d_sync.ds_syncid = md->md_syncid; 473 if (errorp != NULL) 474 *errorp = 0; 475 return (disk); 476fail: 477 if (errorp != NULL) 478 *errorp = error; 479 if (disk != NULL) 480 free(disk, M_MIRROR); 481 return (NULL); 482} 483 484static void 485g_mirror_destroy_disk(struct g_mirror_disk *disk) 486{ 487 struct g_mirror_softc *sc; 488 489 g_topology_assert_not(); 490 sc = disk->d_softc; 491 sx_assert(&sc->sc_lock, SX_XLOCKED); 492 493 LIST_REMOVE(disk, d_next); 494 g_mirror_event_cancel(disk); 495 if (sc->sc_hint == disk) 496 sc->sc_hint = NULL; 497 switch (disk->d_state) { 498 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 499 g_mirror_sync_stop(disk, 1); 500 /* FALLTHROUGH */ 501 case G_MIRROR_DISK_STATE_NEW: 502 case G_MIRROR_DISK_STATE_STALE: 503 case G_MIRROR_DISK_STATE_ACTIVE: 504 g_topology_lock(); 505 g_mirror_disconnect_consumer(sc, disk->d_consumer); 506 g_topology_unlock(); 507 free(disk, M_MIRROR); 508 break; 509 default: 510 KASSERT(0 == 1, ("Wrong disk state (%s, %s).", 511 g_mirror_get_diskname(disk), 512 g_mirror_disk_state2str(disk->d_state))); 513 } 514} 515 516static void 517g_mirror_free_device(struct g_mirror_softc *sc) 518{ 519 520 mtx_destroy(&sc->sc_queue_mtx); 521 mtx_destroy(&sc->sc_events_mtx); 522 mtx_destroy(&sc->sc_done_mtx); 523 sx_destroy(&sc->sc_lock); 524 free(sc, M_MIRROR); 525} 526 527static void 528g_mirror_providergone(struct g_provider *pp) 529{ 530 struct g_mirror_softc *sc = pp->private; 531 532 if ((--sc->sc_refcnt) == 0) 533 g_mirror_free_device(sc); 534} 535 536static void 537g_mirror_destroy_device(struct g_mirror_softc *sc) 538{ 539 struct g_mirror_disk *disk; 540 struct g_mirror_event *ep; 541 struct g_geom *gp; 542 struct g_consumer *cp, *tmpcp; 543 544 g_topology_assert_not(); 545 sx_assert(&sc->sc_lock, SX_XLOCKED); 546 547 gp = sc->sc_geom; 548 if (sc->sc_provider != NULL) 549 g_mirror_destroy_provider(sc); 550 for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL; 551 disk = LIST_FIRST(&sc->sc_disks)) { 552 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 553 g_mirror_update_metadata(disk); 554 g_mirror_destroy_disk(disk); 555 } 556 while ((ep = g_mirror_event_get(sc)) != NULL) { 557 g_mirror_event_remove(sc, ep); 558 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 559 g_mirror_event_free(ep); 560 else { 561 ep->e_error = ECANCELED; 562 ep->e_flags |= G_MIRROR_EVENT_DONE; 563 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep); 564 mtx_lock(&sc->sc_events_mtx); 565 wakeup(ep); 566 mtx_unlock(&sc->sc_events_mtx); 567 } 568 } 569 callout_drain(&sc->sc_callout); 570 571 g_topology_lock(); 572 LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) { 573 g_mirror_disconnect_consumer(sc, cp); 574 } 575 g_wither_geom(sc->sc_sync.ds_geom, ENXIO); 576 G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name); 577 g_wither_geom(gp, ENXIO); 578 sx_xunlock(&sc->sc_lock); 579 if ((--sc->sc_refcnt) == 0) 580 g_mirror_free_device(sc); 581 g_topology_unlock(); 582} 583 584static void 585g_mirror_orphan(struct g_consumer *cp) 586{ 587 struct g_mirror_disk *disk; 588 589 g_topology_assert(); 590 591 disk = cp->private; 592 if (disk == NULL) 593 return; 594 disk->d_softc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 595 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 596 G_MIRROR_EVENT_DONTWAIT); 597} 598 599/* 600 * Function should return the next active disk on the list. 601 * It is possible that it will be the same disk as given. 602 * If there are no active disks on list, NULL is returned. 603 */ 604static __inline struct g_mirror_disk * 605g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 606{ 607 struct g_mirror_disk *dp; 608 609 for (dp = LIST_NEXT(disk, d_next); dp != disk; 610 dp = LIST_NEXT(dp, d_next)) { 611 if (dp == NULL) 612 dp = LIST_FIRST(&sc->sc_disks); 613 if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE) 614 break; 615 } 616 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 617 return (NULL); 618 return (dp); 619} 620 621static struct g_mirror_disk * 622g_mirror_get_disk(struct g_mirror_softc *sc) 623{ 624 struct g_mirror_disk *disk; 625 626 if (sc->sc_hint == NULL) { 627 sc->sc_hint = LIST_FIRST(&sc->sc_disks); 628 if (sc->sc_hint == NULL) 629 return (NULL); 630 } 631 disk = sc->sc_hint; 632 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) { 633 disk = g_mirror_find_next(sc, disk); 634 if (disk == NULL) 635 return (NULL); 636 } 637 sc->sc_hint = g_mirror_find_next(sc, disk); 638 return (disk); 639} 640 641static int 642g_mirror_write_metadata(struct g_mirror_disk *disk, 643 struct g_mirror_metadata *md) 644{ 645 struct g_mirror_softc *sc; 646 struct g_consumer *cp; 647 off_t offset, length; 648 u_char *sector; 649 int error = 0; 650 651 g_topology_assert_not(); 652 sc = disk->d_softc; 653 sx_assert(&sc->sc_lock, SX_LOCKED); 654 655 cp = disk->d_consumer; 656 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name)); 657 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name)); 658 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 659 ("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr, 660 cp->acw, cp->ace)); 661 length = cp->provider->sectorsize; 662 offset = cp->provider->mediasize - length; 663 sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO); 664 if (md != NULL && 665 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) { 666 /* 667 * Handle the case, when the size of parent provider reduced. 668 */ 669 if (offset < md->md_mediasize) 670 error = ENOSPC; 671 else 672 mirror_metadata_encode(md, sector); 673 } 674 if (error == 0) 675 error = g_write_data(cp, offset, sector, length); 676 free(sector, M_MIRROR); 677 if (error != 0) { 678 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 679 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 680 G_MIRROR_DEBUG(0, "Cannot write metadata on %s " 681 "(device=%s, error=%d).", 682 g_mirror_get_diskname(disk), sc->sc_name, error); 683 } else { 684 G_MIRROR_DEBUG(1, "Cannot write metadata on %s " 685 "(device=%s, error=%d).", 686 g_mirror_get_diskname(disk), sc->sc_name, error); 687 } 688 if (g_mirror_disconnect_on_failure && 689 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) { 690 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 691 g_mirror_event_send(disk, 692 G_MIRROR_DISK_STATE_DISCONNECTED, 693 G_MIRROR_EVENT_DONTWAIT); 694 } 695 } 696 return (error); 697} 698 699static int 700g_mirror_clear_metadata(struct g_mirror_disk *disk) 701{ 702 int error; 703 704 g_topology_assert_not(); 705 sx_assert(&disk->d_softc->sc_lock, SX_LOCKED); 706 707 error = g_mirror_write_metadata(disk, NULL); 708 if (error == 0) { 709 G_MIRROR_DEBUG(2, "Metadata on %s cleared.", 710 g_mirror_get_diskname(disk)); 711 } else { 712 G_MIRROR_DEBUG(0, 713 "Cannot clear metadata on disk %s (error=%d).", 714 g_mirror_get_diskname(disk), error); 715 } 716 return (error); 717} 718 719void 720g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk, 721 struct g_mirror_metadata *md) 722{ 723 724 strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic)); 725 md->md_version = G_MIRROR_VERSION; 726 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name)); 727 md->md_mid = sc->sc_id; 728 md->md_all = sc->sc_ndisks; 729 md->md_slice = sc->sc_slice; 730 md->md_balance = sc->sc_balance; 731 md->md_genid = sc->sc_genid; 732 md->md_mediasize = sc->sc_mediasize; 733 md->md_sectorsize = sc->sc_sectorsize; 734 md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK); 735 bzero(md->md_provider, sizeof(md->md_provider)); 736 if (disk == NULL) { 737 md->md_did = arc4random(); 738 md->md_priority = 0; 739 md->md_syncid = 0; 740 md->md_dflags = 0; 741 md->md_sync_offset = 0; 742 md->md_provsize = 0; 743 } else { 744 md->md_did = disk->d_id; 745 md->md_priority = disk->d_priority; 746 md->md_syncid = disk->d_sync.ds_syncid; 747 md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK); 748 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 749 md->md_sync_offset = disk->d_sync.ds_offset_done; 750 else 751 md->md_sync_offset = 0; 752 if ((disk->d_flags & G_MIRROR_DISK_FLAG_HARDCODED) != 0) { 753 strlcpy(md->md_provider, 754 disk->d_consumer->provider->name, 755 sizeof(md->md_provider)); 756 } 757 md->md_provsize = disk->d_consumer->provider->mediasize; 758 } 759} 760 761void 762g_mirror_update_metadata(struct g_mirror_disk *disk) 763{ 764 struct g_mirror_softc *sc; 765 struct g_mirror_metadata md; 766 int error; 767 768 g_topology_assert_not(); 769 sc = disk->d_softc; 770 sx_assert(&sc->sc_lock, SX_LOCKED); 771 772 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) 773 g_mirror_fill_metadata(sc, disk, &md); 774 error = g_mirror_write_metadata(disk, &md); 775 if (error == 0) { 776 G_MIRROR_DEBUG(2, "Metadata on %s updated.", 777 g_mirror_get_diskname(disk)); 778 } else { 779 G_MIRROR_DEBUG(0, 780 "Cannot update metadata on disk %s (error=%d).", 781 g_mirror_get_diskname(disk), error); 782 } 783} 784 785static void 786g_mirror_bump_syncid(struct g_mirror_softc *sc) 787{ 788 struct g_mirror_disk *disk; 789 790 g_topology_assert_not(); 791 sx_assert(&sc->sc_lock, SX_XLOCKED); 792 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 793 ("%s called with no active disks (device=%s).", __func__, 794 sc->sc_name)); 795 796 sc->sc_syncid++; 797 G_MIRROR_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name, 798 sc->sc_syncid); 799 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 800 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 801 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 802 disk->d_sync.ds_syncid = sc->sc_syncid; 803 g_mirror_update_metadata(disk); 804 } 805 } 806} 807 808static void 809g_mirror_bump_genid(struct g_mirror_softc *sc) 810{ 811 struct g_mirror_disk *disk; 812 813 g_topology_assert_not(); 814 sx_assert(&sc->sc_lock, SX_XLOCKED); 815 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 816 ("%s called with no active disks (device=%s).", __func__, 817 sc->sc_name)); 818 819 sc->sc_genid++; 820 G_MIRROR_DEBUG(1, "Device %s: genid bumped to %u.", sc->sc_name, 821 sc->sc_genid); 822 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 823 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 824 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 825 disk->d_genid = sc->sc_genid; 826 g_mirror_update_metadata(disk); 827 } 828 } 829} 830 831static int 832g_mirror_idle(struct g_mirror_softc *sc, int acw) 833{ 834 struct g_mirror_disk *disk; 835 int timeout; 836 837 g_topology_assert_not(); 838 sx_assert(&sc->sc_lock, SX_XLOCKED); 839 840 if (sc->sc_provider == NULL) 841 return (0); 842 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 843 return (0); 844 if (sc->sc_idle) 845 return (0); 846 if (sc->sc_writes > 0) 847 return (0); 848 if (acw > 0 || (acw == -1 && sc->sc_provider->acw > 0)) { 849 timeout = g_mirror_idletime - (time_uptime - sc->sc_last_write); 850 if (!g_mirror_shutdown && timeout > 0) 851 return (timeout); 852 } 853 sc->sc_idle = 1; 854 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 855 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 856 continue; 857 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.", 858 g_mirror_get_diskname(disk), sc->sc_name); 859 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 860 g_mirror_update_metadata(disk); 861 } 862 return (0); 863} 864 865static void 866g_mirror_unidle(struct g_mirror_softc *sc) 867{ 868 struct g_mirror_disk *disk; 869 870 g_topology_assert_not(); 871 sx_assert(&sc->sc_lock, SX_XLOCKED); 872 873 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 874 return; 875 sc->sc_idle = 0; 876 sc->sc_last_write = time_uptime; 877 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 878 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 879 continue; 880 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.", 881 g_mirror_get_diskname(disk), sc->sc_name); 882 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 883 g_mirror_update_metadata(disk); 884 } 885} 886 887static void 888g_mirror_flush_done(struct bio *bp) 889{ 890 struct g_mirror_softc *sc; 891 struct bio *pbp; 892 893 pbp = bp->bio_parent; 894 sc = pbp->bio_to->private; 895 mtx_lock(&sc->sc_done_mtx); 896 if (pbp->bio_error == 0) 897 pbp->bio_error = bp->bio_error; 898 pbp->bio_completed += bp->bio_completed; 899 pbp->bio_inbed++; 900 if (pbp->bio_children == pbp->bio_inbed) { 901 mtx_unlock(&sc->sc_done_mtx); 902 g_io_deliver(pbp, pbp->bio_error); 903 } else 904 mtx_unlock(&sc->sc_done_mtx); 905 g_destroy_bio(bp); 906} 907 908static void 909g_mirror_done(struct bio *bp) 910{ 911 struct g_mirror_softc *sc; 912 913 sc = bp->bio_from->geom->softc; 914 bp->bio_cflags = G_MIRROR_BIO_FLAG_REGULAR; 915 mtx_lock(&sc->sc_queue_mtx); 916 bioq_insert_tail(&sc->sc_queue, bp); 917 mtx_unlock(&sc->sc_queue_mtx); 918 wakeup(sc); 919} 920 921static void 922g_mirror_regular_request(struct bio *bp) 923{ 924 struct g_mirror_softc *sc; 925 struct g_mirror_disk *disk; 926 struct bio *pbp; 927 928 g_topology_assert_not(); 929 930 pbp = bp->bio_parent; 931 sc = pbp->bio_to->private; 932 bp->bio_from->index--; 933 if (bp->bio_cmd == BIO_WRITE) 934 sc->sc_writes--; 935 disk = bp->bio_from->private; 936 if (disk == NULL) { 937 g_topology_lock(); 938 g_mirror_kill_consumer(sc, bp->bio_from); 939 g_topology_unlock(); 940 } 941 942 pbp->bio_inbed++; 943 KASSERT(pbp->bio_inbed <= pbp->bio_children, 944 ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed, 945 pbp->bio_children)); 946 if (bp->bio_error == 0 && pbp->bio_error == 0) { 947 G_MIRROR_LOGREQ(3, bp, "Request delivered."); 948 g_destroy_bio(bp); 949 if (pbp->bio_children == pbp->bio_inbed) { 950 G_MIRROR_LOGREQ(3, pbp, "Request delivered."); 951 pbp->bio_completed = pbp->bio_length; 952 if (pbp->bio_cmd == BIO_WRITE || 953 pbp->bio_cmd == BIO_DELETE) { 954 bioq_remove(&sc->sc_inflight, pbp); 955 /* Release delayed sync requests if possible. */ 956 g_mirror_sync_release(sc); 957 } 958 g_io_deliver(pbp, pbp->bio_error); 959 } 960 return; 961 } else if (bp->bio_error != 0) { 962 if (pbp->bio_error == 0) 963 pbp->bio_error = bp->bio_error; 964 if (disk != NULL) { 965 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 966 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 967 G_MIRROR_LOGREQ(0, bp, 968 "Request failed (error=%d).", 969 bp->bio_error); 970 } else { 971 G_MIRROR_LOGREQ(1, bp, 972 "Request failed (error=%d).", 973 bp->bio_error); 974 } 975 if (g_mirror_disconnect_on_failure && 976 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) 977 { 978 if (bp->bio_error == ENXIO && 979 bp->bio_cmd == BIO_READ) 980 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 981 else if (bp->bio_error == ENXIO) 982 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID_NOW; 983 else 984 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 985 g_mirror_event_send(disk, 986 G_MIRROR_DISK_STATE_DISCONNECTED, 987 G_MIRROR_EVENT_DONTWAIT); 988 } 989 } 990 switch (pbp->bio_cmd) { 991 case BIO_DELETE: 992 case BIO_WRITE: 993 pbp->bio_inbed--; 994 pbp->bio_children--; 995 break; 996 } 997 } 998 g_destroy_bio(bp); 999 1000 switch (pbp->bio_cmd) { 1001 case BIO_READ: 1002 if (pbp->bio_inbed < pbp->bio_children) 1003 break; 1004 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 1) 1005 g_io_deliver(pbp, pbp->bio_error); 1006 else { 1007 pbp->bio_error = 0; 1008 mtx_lock(&sc->sc_queue_mtx); 1009 bioq_insert_tail(&sc->sc_queue, pbp); 1010 mtx_unlock(&sc->sc_queue_mtx); 1011 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 1012 wakeup(sc); 1013 } 1014 break; 1015 case BIO_DELETE: 1016 case BIO_WRITE: 1017 if (pbp->bio_children == 0) { 1018 /* 1019 * All requests failed. 1020 */ 1021 } else if (pbp->bio_inbed < pbp->bio_children) { 1022 /* Do nothing. */ 1023 break; 1024 } else if (pbp->bio_children == pbp->bio_inbed) { 1025 /* Some requests succeeded. */ 1026 pbp->bio_error = 0; 1027 pbp->bio_completed = pbp->bio_length; 1028 } 1029 bioq_remove(&sc->sc_inflight, pbp); 1030 /* Release delayed sync requests if possible. */ 1031 g_mirror_sync_release(sc); 1032 g_io_deliver(pbp, pbp->bio_error); 1033 break; 1034 default: 1035 KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd)); 1036 break; 1037 } 1038} 1039 1040static void 1041g_mirror_sync_done(struct bio *bp) 1042{ 1043 struct g_mirror_softc *sc; 1044 1045 G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered."); 1046 sc = bp->bio_from->geom->softc; 1047 bp->bio_cflags = G_MIRROR_BIO_FLAG_SYNC; 1048 mtx_lock(&sc->sc_queue_mtx); 1049 bioq_insert_tail(&sc->sc_queue, bp); 1050 mtx_unlock(&sc->sc_queue_mtx); 1051 wakeup(sc); 1052} 1053 1054static void 1055g_mirror_candelete(struct bio *bp) 1056{ 1057 struct g_mirror_softc *sc; 1058 struct g_mirror_disk *disk; 1059 int *val; 1060 1061 sc = bp->bio_to->private; 1062 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1063 if (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) 1064 break; 1065 } 1066 val = (int *)bp->bio_data; 1067 *val = (disk != NULL); 1068 g_io_deliver(bp, 0); 1069} 1070 1071static void 1072g_mirror_kernel_dump(struct bio *bp) 1073{ 1074 struct g_mirror_softc *sc; 1075 struct g_mirror_disk *disk; 1076 struct bio *cbp; 1077 struct g_kerneldump *gkd; 1078 1079 /* 1080 * We configure dumping to the first component, because this component 1081 * will be used for reading with 'prefer' balance algorithm. 1082 * If the component with the higest priority is currently disconnected 1083 * we will not be able to read the dump after the reboot if it will be 1084 * connected and synchronized later. Can we do something better? 1085 */ 1086 sc = bp->bio_to->private; 1087 disk = LIST_FIRST(&sc->sc_disks); 1088 1089 gkd = (struct g_kerneldump *)bp->bio_data; 1090 if (gkd->length > bp->bio_to->mediasize) 1091 gkd->length = bp->bio_to->mediasize; 1092 cbp = g_clone_bio(bp); 1093 if (cbp == NULL) { 1094 g_io_deliver(bp, ENOMEM); 1095 return; 1096 } 1097 cbp->bio_done = g_std_done; 1098 g_io_request(cbp, disk->d_consumer); 1099 G_MIRROR_DEBUG(1, "Kernel dump will go to %s.", 1100 g_mirror_get_diskname(disk)); 1101} 1102 1103static void 1104g_mirror_flush(struct g_mirror_softc *sc, struct bio *bp) 1105{ 1106 struct bio_queue_head queue; 1107 struct g_mirror_disk *disk; 1108 struct g_consumer *cp; 1109 struct bio *cbp; 1110 1111 bioq_init(&queue); 1112 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1113 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1114 continue; 1115 cbp = g_clone_bio(bp); 1116 if (cbp == NULL) { 1117 while ((cbp = bioq_takefirst(&queue)) != NULL) 1118 g_destroy_bio(cbp); 1119 if (bp->bio_error == 0) 1120 bp->bio_error = ENOMEM; 1121 g_io_deliver(bp, bp->bio_error); 1122 return; 1123 } 1124 bioq_insert_tail(&queue, cbp); 1125 cbp->bio_done = g_mirror_flush_done; 1126 cbp->bio_caller1 = disk; 1127 cbp->bio_to = disk->d_consumer->provider; 1128 } 1129 while ((cbp = bioq_takefirst(&queue)) != NULL) { 1130 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1131 disk = cbp->bio_caller1; 1132 cbp->bio_caller1 = NULL; 1133 cp = disk->d_consumer; 1134 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1135 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1136 cp->acr, cp->acw, cp->ace)); 1137 g_io_request(cbp, disk->d_consumer); 1138 } 1139} 1140 1141static void 1142g_mirror_start(struct bio *bp) 1143{ 1144 struct g_mirror_softc *sc; 1145 1146 sc = bp->bio_to->private; 1147 /* 1148 * If sc == NULL or there are no valid disks, provider's error 1149 * should be set and g_mirror_start() should not be called at all. 1150 */ 1151 KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1152 ("Provider's error should be set (error=%d)(mirror=%s).", 1153 bp->bio_to->error, bp->bio_to->name)); 1154 G_MIRROR_LOGREQ(3, bp, "Request received."); 1155 1156 switch (bp->bio_cmd) { 1157 case BIO_READ: 1158 case BIO_WRITE: 1159 case BIO_DELETE: 1160 break; 1161 case BIO_FLUSH: 1162 g_mirror_flush(sc, bp); 1163 return; 1164 case BIO_GETATTR: 1165 if (!strcmp(bp->bio_attribute, "GEOM::candelete")) { 1166 g_mirror_candelete(bp); 1167 return; 1168 } else if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) { 1169 g_mirror_kernel_dump(bp); 1170 return; 1171 } 1172 /* FALLTHROUGH */ 1173 default: 1174 g_io_deliver(bp, EOPNOTSUPP); 1175 return; 1176 } 1177 mtx_lock(&sc->sc_queue_mtx); 1178 bioq_insert_tail(&sc->sc_queue, bp); 1179 mtx_unlock(&sc->sc_queue_mtx); 1180 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 1181 wakeup(sc); 1182} 1183 1184/* 1185 * Return TRUE if the given request is colliding with a in-progress 1186 * synchronization request. 1187 */ 1188static int 1189g_mirror_sync_collision(struct g_mirror_softc *sc, struct bio *bp) 1190{ 1191 struct g_mirror_disk *disk; 1192 struct bio *sbp; 1193 off_t rstart, rend, sstart, send; 1194 u_int i; 1195 1196 if (sc->sc_sync.ds_ndisks == 0) 1197 return (0); 1198 rstart = bp->bio_offset; 1199 rend = bp->bio_offset + bp->bio_length; 1200 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1201 if (disk->d_state != G_MIRROR_DISK_STATE_SYNCHRONIZING) 1202 continue; 1203 for (i = 0; i < g_mirror_syncreqs; i++) { 1204 sbp = disk->d_sync.ds_bios[i]; 1205 if (sbp == NULL) 1206 continue; 1207 sstart = sbp->bio_offset; 1208 send = sbp->bio_offset + sbp->bio_length; 1209 if (rend > sstart && rstart < send) 1210 return (1); 1211 } 1212 } 1213 return (0); 1214} 1215 1216/* 1217 * Return TRUE if the given sync request is colliding with a in-progress regular 1218 * request. 1219 */ 1220static int 1221g_mirror_regular_collision(struct g_mirror_softc *sc, struct bio *sbp) 1222{ 1223 off_t rstart, rend, sstart, send; 1224 struct bio *bp; 1225 1226 if (sc->sc_sync.ds_ndisks == 0) 1227 return (0); 1228 sstart = sbp->bio_offset; 1229 send = sbp->bio_offset + sbp->bio_length; 1230 TAILQ_FOREACH(bp, &sc->sc_inflight.queue, bio_queue) { 1231 rstart = bp->bio_offset; 1232 rend = bp->bio_offset + bp->bio_length; 1233 if (rend > sstart && rstart < send) 1234 return (1); 1235 } 1236 return (0); 1237} 1238 1239/* 1240 * Puts request onto delayed queue. 1241 */ 1242static void 1243g_mirror_regular_delay(struct g_mirror_softc *sc, struct bio *bp) 1244{ 1245 1246 G_MIRROR_LOGREQ(2, bp, "Delaying request."); 1247 bioq_insert_head(&sc->sc_regular_delayed, bp); 1248} 1249 1250/* 1251 * Puts synchronization request onto delayed queue. 1252 */ 1253static void 1254g_mirror_sync_delay(struct g_mirror_softc *sc, struct bio *bp) 1255{ 1256 1257 G_MIRROR_LOGREQ(2, bp, "Delaying synchronization request."); 1258 bioq_insert_tail(&sc->sc_sync_delayed, bp); 1259} 1260 1261/* 1262 * Releases delayed regular requests which don't collide anymore with sync 1263 * requests. 1264 */ 1265static void 1266g_mirror_regular_release(struct g_mirror_softc *sc) 1267{ 1268 struct bio *bp, *bp2; 1269 1270 TAILQ_FOREACH_SAFE(bp, &sc->sc_regular_delayed.queue, bio_queue, bp2) { 1271 if (g_mirror_sync_collision(sc, bp)) 1272 continue; 1273 bioq_remove(&sc->sc_regular_delayed, bp); 1274 G_MIRROR_LOGREQ(2, bp, "Releasing delayed request (%p).", bp); 1275 mtx_lock(&sc->sc_queue_mtx); 1276 bioq_insert_head(&sc->sc_queue, bp); 1277#if 0 1278 /* 1279 * wakeup() is not needed, because this function is called from 1280 * the worker thread. 1281 */ 1282 wakeup(&sc->sc_queue); 1283#endif 1284 mtx_unlock(&sc->sc_queue_mtx); 1285 } 1286} 1287 1288/* 1289 * Releases delayed sync requests which don't collide anymore with regular 1290 * requests. 1291 */ 1292static void 1293g_mirror_sync_release(struct g_mirror_softc *sc) 1294{ 1295 struct bio *bp, *bp2; 1296 1297 TAILQ_FOREACH_SAFE(bp, &sc->sc_sync_delayed.queue, bio_queue, bp2) { 1298 if (g_mirror_regular_collision(sc, bp)) 1299 continue; 1300 bioq_remove(&sc->sc_sync_delayed, bp); 1301 G_MIRROR_LOGREQ(2, bp, 1302 "Releasing delayed synchronization request."); 1303 g_io_request(bp, bp->bio_from); 1304 } 1305} 1306 1307/* 1308 * Handle synchronization requests. 1309 * Every synchronization request is two-steps process: first, READ request is 1310 * send to active provider and then WRITE request (with read data) to the provider 1311 * beeing synchronized. When WRITE is finished, new synchronization request is 1312 * send. 1313 */ 1314static void 1315g_mirror_sync_request(struct bio *bp) 1316{ 1317 struct g_mirror_softc *sc; 1318 struct g_mirror_disk *disk; 1319 1320 bp->bio_from->index--; 1321 sc = bp->bio_from->geom->softc; 1322 disk = bp->bio_from->private; 1323 if (disk == NULL) { 1324 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 1325 g_topology_lock(); 1326 g_mirror_kill_consumer(sc, bp->bio_from); 1327 g_topology_unlock(); 1328 free(bp->bio_data, M_MIRROR); 1329 g_destroy_bio(bp); 1330 sx_xlock(&sc->sc_lock); 1331 return; 1332 } 1333 1334 /* 1335 * Synchronization request. 1336 */ 1337 switch (bp->bio_cmd) { 1338 case BIO_READ: 1339 { 1340 struct g_consumer *cp; 1341 1342 if (bp->bio_error != 0) { 1343 G_MIRROR_LOGREQ(0, bp, 1344 "Synchronization request failed (error=%d).", 1345 bp->bio_error); 1346 g_destroy_bio(bp); 1347 return; 1348 } 1349 G_MIRROR_LOGREQ(3, bp, 1350 "Synchronization request half-finished."); 1351 bp->bio_cmd = BIO_WRITE; 1352 bp->bio_cflags = 0; 1353 cp = disk->d_consumer; 1354 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1355 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1356 cp->acr, cp->acw, cp->ace)); 1357 cp->index++; 1358 g_io_request(bp, cp); 1359 return; 1360 } 1361 case BIO_WRITE: 1362 { 1363 struct g_mirror_disk_sync *sync; 1364 off_t offset; 1365 void *data; 1366 int i; 1367 1368 if (bp->bio_error != 0) { 1369 G_MIRROR_LOGREQ(0, bp, 1370 "Synchronization request failed (error=%d).", 1371 bp->bio_error); 1372 g_destroy_bio(bp); 1373 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 1374 g_mirror_event_send(disk, 1375 G_MIRROR_DISK_STATE_DISCONNECTED, 1376 G_MIRROR_EVENT_DONTWAIT); 1377 return; 1378 } 1379 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished."); 1380 sync = &disk->d_sync; 1381 if (sync->ds_offset >= sc->sc_mediasize || 1382 sync->ds_consumer == NULL || 1383 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1384 /* Don't send more synchronization requests. */ 1385 sync->ds_inflight--; 1386 if (sync->ds_bios != NULL) { 1387 i = (int)(uintptr_t)bp->bio_caller1; 1388 sync->ds_bios[i] = NULL; 1389 } 1390 free(bp->bio_data, M_MIRROR); 1391 g_destroy_bio(bp); 1392 if (sync->ds_inflight > 0) 1393 return; 1394 if (sync->ds_consumer == NULL || 1395 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1396 return; 1397 } 1398 /* Disk up-to-date, activate it. */ 1399 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE, 1400 G_MIRROR_EVENT_DONTWAIT); 1401 return; 1402 } 1403 1404 /* Send next synchronization request. */ 1405 data = bp->bio_data; 1406 bzero(bp, sizeof(*bp)); 1407 bp->bio_cmd = BIO_READ; 1408 bp->bio_offset = sync->ds_offset; 1409 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset); 1410 sync->ds_offset += bp->bio_length; 1411 bp->bio_done = g_mirror_sync_done; 1412 bp->bio_data = data; 1413 bp->bio_from = sync->ds_consumer; 1414 bp->bio_to = sc->sc_provider; 1415 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 1416 sync->ds_consumer->index++; 1417 /* 1418 * Delay the request if it is colliding with a regular request. 1419 */ 1420 if (g_mirror_regular_collision(sc, bp)) 1421 g_mirror_sync_delay(sc, bp); 1422 else 1423 g_io_request(bp, sync->ds_consumer); 1424 1425 /* Release delayed requests if possible. */ 1426 g_mirror_regular_release(sc); 1427 1428 /* Find the smallest offset */ 1429 offset = sc->sc_mediasize; 1430 for (i = 0; i < g_mirror_syncreqs; i++) { 1431 bp = sync->ds_bios[i]; 1432 if (bp->bio_offset < offset) 1433 offset = bp->bio_offset; 1434 } 1435 if (sync->ds_offset_done + (MAXPHYS * 100) < offset) { 1436 /* Update offset_done on every 100 blocks. */ 1437 sync->ds_offset_done = offset; 1438 g_mirror_update_metadata(disk); 1439 } 1440 return; 1441 } 1442 default: 1443 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1444 bp->bio_cmd, sc->sc_name)); 1445 break; 1446 } 1447} 1448 1449static void 1450g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp) 1451{ 1452 struct g_mirror_disk *disk; 1453 struct g_consumer *cp; 1454 struct bio *cbp; 1455 1456 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1457 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE) 1458 break; 1459 } 1460 if (disk == NULL) { 1461 if (bp->bio_error == 0) 1462 bp->bio_error = ENXIO; 1463 g_io_deliver(bp, bp->bio_error); 1464 return; 1465 } 1466 cbp = g_clone_bio(bp); 1467 if (cbp == NULL) { 1468 if (bp->bio_error == 0) 1469 bp->bio_error = ENOMEM; 1470 g_io_deliver(bp, bp->bio_error); 1471 return; 1472 } 1473 /* 1474 * Fill in the component buf structure. 1475 */ 1476 cp = disk->d_consumer; 1477 cbp->bio_done = g_mirror_done; 1478 cbp->bio_to = cp->provider; 1479 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1480 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1481 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1482 cp->acw, cp->ace)); 1483 cp->index++; 1484 g_io_request(cbp, cp); 1485} 1486 1487static void 1488g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp) 1489{ 1490 struct g_mirror_disk *disk; 1491 struct g_consumer *cp; 1492 struct bio *cbp; 1493 1494 disk = g_mirror_get_disk(sc); 1495 if (disk == NULL) { 1496 if (bp->bio_error == 0) 1497 bp->bio_error = ENXIO; 1498 g_io_deliver(bp, bp->bio_error); 1499 return; 1500 } 1501 cbp = g_clone_bio(bp); 1502 if (cbp == NULL) { 1503 if (bp->bio_error == 0) 1504 bp->bio_error = ENOMEM; 1505 g_io_deliver(bp, bp->bio_error); 1506 return; 1507 } 1508 /* 1509 * Fill in the component buf structure. 1510 */ 1511 cp = disk->d_consumer; 1512 cbp->bio_done = g_mirror_done; 1513 cbp->bio_to = cp->provider; 1514 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1515 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1516 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1517 cp->acw, cp->ace)); 1518 cp->index++; 1519 g_io_request(cbp, cp); 1520} 1521 1522#define TRACK_SIZE (1 * 1024 * 1024) 1523#define LOAD_SCALE 256 1524#define ABS(x) (((x) >= 0) ? (x) : (-(x))) 1525 1526static void 1527g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp) 1528{ 1529 struct g_mirror_disk *disk, *dp; 1530 struct g_consumer *cp; 1531 struct bio *cbp; 1532 int prio, best; 1533 1534 /* Find a disk with the smallest load. */ 1535 disk = NULL; 1536 best = INT_MAX; 1537 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1538 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1539 continue; 1540 prio = dp->load; 1541 /* If disk head is precisely in position - highly prefer it. */ 1542 if (dp->d_last_offset == bp->bio_offset) 1543 prio -= 2 * LOAD_SCALE; 1544 else 1545 /* If disk head is close to position - prefer it. */ 1546 if (ABS(dp->d_last_offset - bp->bio_offset) < TRACK_SIZE) 1547 prio -= 1 * LOAD_SCALE; 1548 if (prio <= best) { 1549 disk = dp; 1550 best = prio; 1551 } 1552 } 1553 KASSERT(disk != NULL, ("NULL disk for %s.", sc->sc_name)); 1554 cbp = g_clone_bio(bp); 1555 if (cbp == NULL) { 1556 if (bp->bio_error == 0) 1557 bp->bio_error = ENOMEM; 1558 g_io_deliver(bp, bp->bio_error); 1559 return; 1560 } 1561 /* 1562 * Fill in the component buf structure. 1563 */ 1564 cp = disk->d_consumer; 1565 cbp->bio_done = g_mirror_done; 1566 cbp->bio_to = cp->provider; 1567 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1568 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1569 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1570 cp->acw, cp->ace)); 1571 cp->index++; 1572 /* Remember last head position */ 1573 disk->d_last_offset = bp->bio_offset + bp->bio_length; 1574 /* Update loads. */ 1575 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1576 dp->load = (dp->d_consumer->index * LOAD_SCALE + 1577 dp->load * 7) / 8; 1578 } 1579 g_io_request(cbp, cp); 1580} 1581 1582static void 1583g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp) 1584{ 1585 struct bio_queue_head queue; 1586 struct g_mirror_disk *disk; 1587 struct g_consumer *cp; 1588 struct bio *cbp; 1589 off_t left, mod, offset, slice; 1590 u_char *data; 1591 u_int ndisks; 1592 1593 if (bp->bio_length <= sc->sc_slice) { 1594 g_mirror_request_round_robin(sc, bp); 1595 return; 1596 } 1597 ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE); 1598 slice = bp->bio_length / ndisks; 1599 mod = slice % sc->sc_provider->sectorsize; 1600 if (mod != 0) 1601 slice += sc->sc_provider->sectorsize - mod; 1602 /* 1603 * Allocate all bios before sending any request, so we can 1604 * return ENOMEM in nice and clean way. 1605 */ 1606 left = bp->bio_length; 1607 offset = bp->bio_offset; 1608 data = bp->bio_data; 1609 bioq_init(&queue); 1610 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1611 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1612 continue; 1613 cbp = g_clone_bio(bp); 1614 if (cbp == NULL) { 1615 while ((cbp = bioq_takefirst(&queue)) != NULL) 1616 g_destroy_bio(cbp); 1617 if (bp->bio_error == 0) 1618 bp->bio_error = ENOMEM; 1619 g_io_deliver(bp, bp->bio_error); 1620 return; 1621 } 1622 bioq_insert_tail(&queue, cbp); 1623 cbp->bio_done = g_mirror_done; 1624 cbp->bio_caller1 = disk; 1625 cbp->bio_to = disk->d_consumer->provider; 1626 cbp->bio_offset = offset; 1627 cbp->bio_data = data; 1628 cbp->bio_length = MIN(left, slice); 1629 left -= cbp->bio_length; 1630 if (left == 0) 1631 break; 1632 offset += cbp->bio_length; 1633 data += cbp->bio_length; 1634 } 1635 while ((cbp = bioq_takefirst(&queue)) != NULL) { 1636 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1637 disk = cbp->bio_caller1; 1638 cbp->bio_caller1 = NULL; 1639 cp = disk->d_consumer; 1640 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1641 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1642 cp->acr, cp->acw, cp->ace)); 1643 disk->d_consumer->index++; 1644 g_io_request(cbp, disk->d_consumer); 1645 } 1646} 1647 1648static void 1649g_mirror_register_request(struct bio *bp) 1650{ 1651 struct g_mirror_softc *sc; 1652 1653 sc = bp->bio_to->private; 1654 switch (bp->bio_cmd) { 1655 case BIO_READ: 1656 switch (sc->sc_balance) { 1657 case G_MIRROR_BALANCE_LOAD: 1658 g_mirror_request_load(sc, bp); 1659 break; 1660 case G_MIRROR_BALANCE_PREFER: 1661 g_mirror_request_prefer(sc, bp); 1662 break; 1663 case G_MIRROR_BALANCE_ROUND_ROBIN: 1664 g_mirror_request_round_robin(sc, bp); 1665 break; 1666 case G_MIRROR_BALANCE_SPLIT: 1667 g_mirror_request_split(sc, bp); 1668 break; 1669 } 1670 return; 1671 case BIO_WRITE: 1672 case BIO_DELETE: 1673 { 1674 struct g_mirror_disk *disk; 1675 struct g_mirror_disk_sync *sync; 1676 struct bio_queue_head queue; 1677 struct g_consumer *cp; 1678 struct bio *cbp; 1679 1680 /* 1681 * Delay the request if it is colliding with a synchronization 1682 * request. 1683 */ 1684 if (g_mirror_sync_collision(sc, bp)) { 1685 g_mirror_regular_delay(sc, bp); 1686 return; 1687 } 1688 1689 if (sc->sc_idle) 1690 g_mirror_unidle(sc); 1691 else 1692 sc->sc_last_write = time_uptime; 1693 1694 /* 1695 * Allocate all bios before sending any request, so we can 1696 * return ENOMEM in nice and clean way. 1697 */ 1698 bioq_init(&queue); 1699 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1700 sync = &disk->d_sync; 1701 switch (disk->d_state) { 1702 case G_MIRROR_DISK_STATE_ACTIVE: 1703 break; 1704 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 1705 if (bp->bio_offset >= sync->ds_offset) 1706 continue; 1707 break; 1708 default: 1709 continue; 1710 } 1711 if (bp->bio_cmd == BIO_DELETE && 1712 (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) == 0) 1713 continue; 1714 cbp = g_clone_bio(bp); 1715 if (cbp == NULL) { 1716 while ((cbp = bioq_takefirst(&queue)) != NULL) 1717 g_destroy_bio(cbp); 1718 if (bp->bio_error == 0) 1719 bp->bio_error = ENOMEM; 1720 g_io_deliver(bp, bp->bio_error); 1721 return; 1722 } 1723 bioq_insert_tail(&queue, cbp); 1724 cbp->bio_done = g_mirror_done; 1725 cp = disk->d_consumer; 1726 cbp->bio_caller1 = cp; 1727 cbp->bio_to = cp->provider; 1728 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1729 ("Consumer %s not opened (r%dw%de%d).", 1730 cp->provider->name, cp->acr, cp->acw, cp->ace)); 1731 } 1732 if (bioq_first(&queue) == NULL) { 1733 g_io_deliver(bp, EOPNOTSUPP); 1734 return; 1735 } 1736 while ((cbp = bioq_takefirst(&queue)) != NULL) { 1737 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1738 cp = cbp->bio_caller1; 1739 cbp->bio_caller1 = NULL; 1740 cp->index++; 1741 sc->sc_writes++; 1742 g_io_request(cbp, cp); 1743 } 1744 /* 1745 * Put request onto inflight queue, so we can check if new 1746 * synchronization requests don't collide with it. 1747 */ 1748 bioq_insert_tail(&sc->sc_inflight, bp); 1749 /* 1750 * Bump syncid on first write. 1751 */ 1752 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) { 1753 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 1754 g_mirror_bump_syncid(sc); 1755 } 1756 return; 1757 } 1758 default: 1759 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1760 bp->bio_cmd, sc->sc_name)); 1761 break; 1762 } 1763} 1764 1765static int 1766g_mirror_can_destroy(struct g_mirror_softc *sc) 1767{ 1768 struct g_geom *gp; 1769 struct g_consumer *cp; 1770 1771 g_topology_assert(); 1772 gp = sc->sc_geom; 1773 if (gp->softc == NULL) 1774 return (1); 1775 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_TASTING) != 0) 1776 return (0); 1777 LIST_FOREACH(cp, &gp->consumer, consumer) { 1778 if (g_mirror_is_busy(sc, cp)) 1779 return (0); 1780 } 1781 gp = sc->sc_sync.ds_geom; 1782 LIST_FOREACH(cp, &gp->consumer, consumer) { 1783 if (g_mirror_is_busy(sc, cp)) 1784 return (0); 1785 } 1786 G_MIRROR_DEBUG(2, "No I/O requests for %s, it can be destroyed.", 1787 sc->sc_name); 1788 return (1); 1789} 1790 1791static int 1792g_mirror_try_destroy(struct g_mirror_softc *sc) 1793{ 1794 1795 if (sc->sc_rootmount != NULL) { 1796 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 1797 sc->sc_rootmount); 1798 root_mount_rel(sc->sc_rootmount); 1799 sc->sc_rootmount = NULL; 1800 } 1801 g_topology_lock(); 1802 if (!g_mirror_can_destroy(sc)) { 1803 g_topology_unlock(); 1804 return (0); 1805 } 1806 sc->sc_geom->softc = NULL; 1807 sc->sc_sync.ds_geom->softc = NULL; 1808 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WAIT) != 0) { 1809 g_topology_unlock(); 1810 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1811 &sc->sc_worker); 1812 /* Unlock sc_lock here, as it can be destroyed after wakeup. */ 1813 sx_xunlock(&sc->sc_lock); 1814 wakeup(&sc->sc_worker); 1815 sc->sc_worker = NULL; 1816 } else { 1817 g_topology_unlock(); 1818 g_mirror_destroy_device(sc); 1819 } 1820 return (1); 1821} 1822 1823/* 1824 * Worker thread. 1825 */ 1826static void 1827g_mirror_worker(void *arg) 1828{ 1829 struct g_mirror_softc *sc; 1830 struct g_mirror_event *ep; 1831 struct bio *bp; 1832 int timeout; 1833 1834 sc = arg; 1835 thread_lock(curthread); 1836 sched_prio(curthread, PRIBIO); 1837 thread_unlock(curthread); 1838 1839 sx_xlock(&sc->sc_lock); 1840 for (;;) { 1841 G_MIRROR_DEBUG(5, "%s: Let's see...", __func__); 1842 /* 1843 * First take a look at events. 1844 * This is important to handle events before any I/O requests. 1845 */ 1846 ep = g_mirror_event_get(sc); 1847 if (ep != NULL) { 1848 g_mirror_event_remove(sc, ep); 1849 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) { 1850 /* Update only device status. */ 1851 G_MIRROR_DEBUG(3, 1852 "Running event for device %s.", 1853 sc->sc_name); 1854 ep->e_error = 0; 1855 g_mirror_update_device(sc, 1); 1856 } else { 1857 /* Update disk status. */ 1858 G_MIRROR_DEBUG(3, "Running event for disk %s.", 1859 g_mirror_get_diskname(ep->e_disk)); 1860 ep->e_error = g_mirror_update_disk(ep->e_disk, 1861 ep->e_state); 1862 if (ep->e_error == 0) 1863 g_mirror_update_device(sc, 0); 1864 } 1865 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) { 1866 KASSERT(ep->e_error == 0, 1867 ("Error cannot be handled.")); 1868 g_mirror_event_free(ep); 1869 } else { 1870 ep->e_flags |= G_MIRROR_EVENT_DONE; 1871 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1872 ep); 1873 mtx_lock(&sc->sc_events_mtx); 1874 wakeup(ep); 1875 mtx_unlock(&sc->sc_events_mtx); 1876 } 1877 if ((sc->sc_flags & 1878 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1879 if (g_mirror_try_destroy(sc)) { 1880 curthread->td_pflags &= ~TDP_GEOM; 1881 G_MIRROR_DEBUG(1, "Thread exiting."); 1882 kproc_exit(0); 1883 } 1884 } 1885 G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__); 1886 continue; 1887 } 1888 /* 1889 * Check if we can mark array as CLEAN and if we can't take 1890 * how much seconds should we wait. 1891 */ 1892 timeout = g_mirror_idle(sc, -1); 1893 /* 1894 * Now I/O requests. 1895 */ 1896 /* Get first request from the queue. */ 1897 mtx_lock(&sc->sc_queue_mtx); 1898 bp = bioq_takefirst(&sc->sc_queue); 1899 if (bp == NULL) { 1900 if ((sc->sc_flags & 1901 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1902 mtx_unlock(&sc->sc_queue_mtx); 1903 if (g_mirror_try_destroy(sc)) { 1904 curthread->td_pflags &= ~TDP_GEOM; 1905 G_MIRROR_DEBUG(1, "Thread exiting."); 1906 kproc_exit(0); 1907 } 1908 mtx_lock(&sc->sc_queue_mtx); 1909 } 1910 sx_xunlock(&sc->sc_lock); 1911 /* 1912 * XXX: We can miss an event here, because an event 1913 * can be added without sx-device-lock and without 1914 * mtx-queue-lock. Maybe I should just stop using 1915 * dedicated mutex for events synchronization and 1916 * stick with the queue lock? 1917 * The event will hang here until next I/O request 1918 * or next event is received. 1919 */ 1920 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w1", 1921 timeout * hz); 1922 sx_xlock(&sc->sc_lock); 1923 G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__); 1924 continue; 1925 } 1926 mtx_unlock(&sc->sc_queue_mtx); 1927 1928 if (bp->bio_from->geom == sc->sc_sync.ds_geom && 1929 (bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) { 1930 g_mirror_sync_request(bp); /* READ */ 1931 } else if (bp->bio_to != sc->sc_provider) { 1932 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0) 1933 g_mirror_regular_request(bp); 1934 else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 1935 g_mirror_sync_request(bp); /* WRITE */ 1936 else { 1937 KASSERT(0, 1938 ("Invalid request cflags=0x%hhx to=%s.", 1939 bp->bio_cflags, bp->bio_to->name)); 1940 } 1941 } else { 1942 g_mirror_register_request(bp); 1943 } 1944 G_MIRROR_DEBUG(5, "%s: I'm here 9.", __func__); 1945 } 1946} 1947 1948static void 1949g_mirror_update_idle(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 1950{ 1951 1952 sx_assert(&sc->sc_lock, SX_LOCKED); 1953 1954 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 1955 return; 1956 if (!sc->sc_idle && (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) { 1957 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.", 1958 g_mirror_get_diskname(disk), sc->sc_name); 1959 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1960 } else if (sc->sc_idle && 1961 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 1962 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.", 1963 g_mirror_get_diskname(disk), sc->sc_name); 1964 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 1965 } 1966} 1967 1968static void 1969g_mirror_sync_start(struct g_mirror_disk *disk) 1970{ 1971 struct g_mirror_softc *sc; 1972 struct g_consumer *cp; 1973 struct bio *bp; 1974 int error, i; 1975 1976 g_topology_assert_not(); 1977 sc = disk->d_softc; 1978 sx_assert(&sc->sc_lock, SX_LOCKED); 1979 1980 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 1981 ("Disk %s is not marked for synchronization.", 1982 g_mirror_get_diskname(disk))); 1983 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1984 ("Device not in RUNNING state (%s, %u).", sc->sc_name, 1985 sc->sc_state)); 1986 1987 sx_xunlock(&sc->sc_lock); 1988 g_topology_lock(); 1989 cp = g_new_consumer(sc->sc_sync.ds_geom); 1990 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 1991 error = g_attach(cp, sc->sc_provider); 1992 KASSERT(error == 0, 1993 ("Cannot attach to %s (error=%d).", sc->sc_name, error)); 1994 error = g_access(cp, 1, 0, 0); 1995 KASSERT(error == 0, ("Cannot open %s (error=%d).", sc->sc_name, error)); 1996 g_topology_unlock(); 1997 sx_xlock(&sc->sc_lock); 1998 1999 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name, 2000 g_mirror_get_diskname(disk)); 2001 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) == 0) 2002 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 2003 KASSERT(disk->d_sync.ds_consumer == NULL, 2004 ("Sync consumer already exists (device=%s, disk=%s).", 2005 sc->sc_name, g_mirror_get_diskname(disk))); 2006 2007 disk->d_sync.ds_consumer = cp; 2008 disk->d_sync.ds_consumer->private = disk; 2009 disk->d_sync.ds_consumer->index = 0; 2010 2011 /* 2012 * Allocate memory for synchronization bios and initialize them. 2013 */ 2014 disk->d_sync.ds_bios = malloc(sizeof(struct bio *) * g_mirror_syncreqs, 2015 M_MIRROR, M_WAITOK); 2016 for (i = 0; i < g_mirror_syncreqs; i++) { 2017 bp = g_alloc_bio(); 2018 disk->d_sync.ds_bios[i] = bp; 2019 bp->bio_parent = NULL; 2020 bp->bio_cmd = BIO_READ; 2021 bp->bio_data = malloc(MAXPHYS, M_MIRROR, M_WAITOK); 2022 bp->bio_cflags = 0; 2023 bp->bio_offset = disk->d_sync.ds_offset; 2024 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset); 2025 disk->d_sync.ds_offset += bp->bio_length; 2026 bp->bio_done = g_mirror_sync_done; 2027 bp->bio_from = disk->d_sync.ds_consumer; 2028 bp->bio_to = sc->sc_provider; 2029 bp->bio_caller1 = (void *)(uintptr_t)i; 2030 } 2031 2032 /* Increase the number of disks in SYNCHRONIZING state. */ 2033 sc->sc_sync.ds_ndisks++; 2034 /* Set the number of in-flight synchronization requests. */ 2035 disk->d_sync.ds_inflight = g_mirror_syncreqs; 2036 2037 /* 2038 * Fire off first synchronization requests. 2039 */ 2040 for (i = 0; i < g_mirror_syncreqs; i++) { 2041 bp = disk->d_sync.ds_bios[i]; 2042 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 2043 disk->d_sync.ds_consumer->index++; 2044 /* 2045 * Delay the request if it is colliding with a regular request. 2046 */ 2047 if (g_mirror_regular_collision(sc, bp)) 2048 g_mirror_sync_delay(sc, bp); 2049 else 2050 g_io_request(bp, disk->d_sync.ds_consumer); 2051 } 2052} 2053 2054/* 2055 * Stop synchronization process. 2056 * type: 0 - synchronization finished 2057 * 1 - synchronization stopped 2058 */ 2059static void 2060g_mirror_sync_stop(struct g_mirror_disk *disk, int type) 2061{ 2062 struct g_mirror_softc *sc; 2063 struct g_consumer *cp; 2064 2065 g_topology_assert_not(); 2066 sc = disk->d_softc; 2067 sx_assert(&sc->sc_lock, SX_LOCKED); 2068 2069 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2070 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2071 g_mirror_disk_state2str(disk->d_state))); 2072 if (disk->d_sync.ds_consumer == NULL) 2073 return; 2074 2075 if (type == 0) { 2076 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.", 2077 sc->sc_name, g_mirror_get_diskname(disk)); 2078 } else /* if (type == 1) */ { 2079 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.", 2080 sc->sc_name, g_mirror_get_diskname(disk)); 2081 } 2082 free(disk->d_sync.ds_bios, M_MIRROR); 2083 disk->d_sync.ds_bios = NULL; 2084 cp = disk->d_sync.ds_consumer; 2085 disk->d_sync.ds_consumer = NULL; 2086 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2087 sc->sc_sync.ds_ndisks--; 2088 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 2089 g_topology_lock(); 2090 g_mirror_kill_consumer(sc, cp); 2091 g_topology_unlock(); 2092 sx_xlock(&sc->sc_lock); 2093} 2094 2095static void 2096g_mirror_launch_provider(struct g_mirror_softc *sc) 2097{ 2098 struct g_mirror_disk *disk; 2099 struct g_provider *pp, *dp; 2100 2101 sx_assert(&sc->sc_lock, SX_LOCKED); 2102 2103 g_topology_lock(); 2104 pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name); 2105 pp->flags |= G_PF_DIRECT_RECEIVE; 2106 pp->mediasize = sc->sc_mediasize; 2107 pp->sectorsize = sc->sc_sectorsize; 2108 pp->stripesize = 0; 2109 pp->stripeoffset = 0; 2110 2111 /* Splitting of unmapped BIO's could work but isn't implemented now */ 2112 if (sc->sc_balance != G_MIRROR_BALANCE_SPLIT) 2113 pp->flags |= G_PF_ACCEPT_UNMAPPED; 2114 2115 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2116 if (disk->d_consumer && disk->d_consumer->provider) { 2117 dp = disk->d_consumer->provider; 2118 if (dp->stripesize > pp->stripesize) { 2119 pp->stripesize = dp->stripesize; 2120 pp->stripeoffset = dp->stripeoffset; 2121 } 2122 /* A provider underneath us doesn't support unmapped */ 2123 if ((dp->flags & G_PF_ACCEPT_UNMAPPED) == 0) { 2124 G_MIRROR_DEBUG(0, "Cancelling unmapped " 2125 "because of %s.", dp->name); 2126 pp->flags &= ~G_PF_ACCEPT_UNMAPPED; 2127 } 2128 } 2129 } 2130 pp->private = sc; 2131 sc->sc_refcnt++; 2132 sc->sc_provider = pp; 2133 g_error_provider(pp, 0); 2134 g_topology_unlock(); 2135 G_MIRROR_DEBUG(0, "Device %s launched (%u/%u).", pp->name, 2136 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE), sc->sc_ndisks); 2137 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2138 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2139 g_mirror_sync_start(disk); 2140 } 2141} 2142 2143static void 2144g_mirror_destroy_provider(struct g_mirror_softc *sc) 2145{ 2146 struct g_mirror_disk *disk; 2147 struct bio *bp; 2148 2149 g_topology_assert_not(); 2150 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).", 2151 sc->sc_name)); 2152 2153 g_topology_lock(); 2154 g_error_provider(sc->sc_provider, ENXIO); 2155 mtx_lock(&sc->sc_queue_mtx); 2156 while ((bp = bioq_takefirst(&sc->sc_queue)) != NULL) { 2157 /* 2158 * Abort any pending I/O that wasn't generated by us. 2159 * Synchronization requests and requests destined for individual 2160 * mirror components can be destroyed immediately. 2161 */ 2162 if (bp->bio_to == sc->sc_provider && 2163 bp->bio_from->geom != sc->sc_sync.ds_geom) { 2164 g_io_deliver(bp, ENXIO); 2165 } else { 2166 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 2167 free(bp->bio_data, M_MIRROR); 2168 g_destroy_bio(bp); 2169 } 2170 } 2171 mtx_unlock(&sc->sc_queue_mtx); 2172 g_wither_provider(sc->sc_provider, ENXIO); 2173 sc->sc_provider = NULL; 2174 G_MIRROR_DEBUG(0, "Device %s: provider destroyed.", sc->sc_name); 2175 g_topology_unlock(); 2176 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2177 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2178 g_mirror_sync_stop(disk, 1); 2179 } 2180} 2181 2182static void 2183g_mirror_go(void *arg) 2184{ 2185 struct g_mirror_softc *sc; 2186 2187 sc = arg; 2188 G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name); 2189 g_mirror_event_send(sc, 0, 2190 G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE); 2191} 2192 2193static u_int 2194g_mirror_determine_state(struct g_mirror_disk *disk) 2195{ 2196 struct g_mirror_softc *sc; 2197 u_int state; 2198 2199 sc = disk->d_softc; 2200 if (sc->sc_syncid == disk->d_sync.ds_syncid) { 2201 if ((disk->d_flags & 2202 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2203 /* Disk does not need synchronization. */ 2204 state = G_MIRROR_DISK_STATE_ACTIVE; 2205 } else { 2206 if ((sc->sc_flags & 2207 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2208 (disk->d_flags & 2209 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2210 /* 2211 * We can start synchronization from 2212 * the stored offset. 2213 */ 2214 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2215 } else { 2216 state = G_MIRROR_DISK_STATE_STALE; 2217 } 2218 } 2219 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) { 2220 /* 2221 * Reset all synchronization data for this disk, 2222 * because if it even was synchronized, it was 2223 * synchronized to disks with different syncid. 2224 */ 2225 disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2226 disk->d_sync.ds_offset = 0; 2227 disk->d_sync.ds_offset_done = 0; 2228 disk->d_sync.ds_syncid = sc->sc_syncid; 2229 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2230 (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2231 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2232 } else { 2233 state = G_MIRROR_DISK_STATE_STALE; 2234 } 2235 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ { 2236 /* 2237 * Not good, NOT GOOD! 2238 * It means that mirror was started on stale disks 2239 * and more fresh disk just arrive. 2240 * If there were writes, mirror is broken, sorry. 2241 * I think the best choice here is don't touch 2242 * this disk and inform the user loudly. 2243 */ 2244 G_MIRROR_DEBUG(0, "Device %s was started before the freshest " 2245 "disk (%s) arrives!! It will not be connected to the " 2246 "running device.", sc->sc_name, 2247 g_mirror_get_diskname(disk)); 2248 g_mirror_destroy_disk(disk); 2249 state = G_MIRROR_DISK_STATE_NONE; 2250 /* Return immediately, because disk was destroyed. */ 2251 return (state); 2252 } 2253 G_MIRROR_DEBUG(3, "State for %s disk: %s.", 2254 g_mirror_get_diskname(disk), g_mirror_disk_state2str(state)); 2255 return (state); 2256} 2257 2258/* 2259 * Update device state. 2260 */ 2261static void 2262g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force) 2263{ 2264 struct g_mirror_disk *disk; 2265 u_int state; 2266 2267 sx_assert(&sc->sc_lock, SX_XLOCKED); 2268 2269 switch (sc->sc_state) { 2270 case G_MIRROR_DEVICE_STATE_STARTING: 2271 { 2272 struct g_mirror_disk *pdisk, *tdisk; 2273 u_int dirty, ndisks, genid, syncid; 2274 2275 KASSERT(sc->sc_provider == NULL, 2276 ("Non-NULL provider in STARTING state (%s).", sc->sc_name)); 2277 /* 2278 * Are we ready? We are, if all disks are connected or 2279 * if we have any disks and 'force' is true. 2280 */ 2281 ndisks = g_mirror_ndisks(sc, -1); 2282 if (sc->sc_ndisks == ndisks || (force && ndisks > 0)) { 2283 ; 2284 } else if (ndisks == 0) { 2285 /* 2286 * Disks went down in starting phase, so destroy 2287 * device. 2288 */ 2289 callout_drain(&sc->sc_callout); 2290 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2291 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 2292 sc->sc_rootmount); 2293 root_mount_rel(sc->sc_rootmount); 2294 sc->sc_rootmount = NULL; 2295 return; 2296 } else { 2297 return; 2298 } 2299 2300 /* 2301 * Activate all disks with the biggest syncid. 2302 */ 2303 if (force) { 2304 /* 2305 * If 'force' is true, we have been called due to 2306 * timeout, so don't bother canceling timeout. 2307 */ 2308 ndisks = 0; 2309 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2310 if ((disk->d_flags & 2311 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2312 ndisks++; 2313 } 2314 } 2315 if (ndisks == 0) { 2316 /* No valid disks found, destroy device. */ 2317 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2318 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2319 __LINE__, sc->sc_rootmount); 2320 root_mount_rel(sc->sc_rootmount); 2321 sc->sc_rootmount = NULL; 2322 return; 2323 } 2324 } else { 2325 /* Cancel timeout. */ 2326 callout_drain(&sc->sc_callout); 2327 } 2328 2329 /* 2330 * Find the biggest genid. 2331 */ 2332 genid = 0; 2333 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2334 if (disk->d_genid > genid) 2335 genid = disk->d_genid; 2336 } 2337 sc->sc_genid = genid; 2338 /* 2339 * Remove all disks without the biggest genid. 2340 */ 2341 LIST_FOREACH_SAFE(disk, &sc->sc_disks, d_next, tdisk) { 2342 if (disk->d_genid < genid) { 2343 G_MIRROR_DEBUG(0, 2344 "Component %s (device %s) broken, skipping.", 2345 g_mirror_get_diskname(disk), sc->sc_name); 2346 g_mirror_destroy_disk(disk); 2347 } 2348 } 2349 2350 /* 2351 * Find the biggest syncid. 2352 */ 2353 syncid = 0; 2354 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2355 if (disk->d_sync.ds_syncid > syncid) 2356 syncid = disk->d_sync.ds_syncid; 2357 } 2358 2359 /* 2360 * Here we need to look for dirty disks and if all disks 2361 * with the biggest syncid are dirty, we have to choose 2362 * one with the biggest priority and rebuild the rest. 2363 */ 2364 /* 2365 * Find the number of dirty disks with the biggest syncid. 2366 * Find the number of disks with the biggest syncid. 2367 * While here, find a disk with the biggest priority. 2368 */ 2369 dirty = ndisks = 0; 2370 pdisk = NULL; 2371 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2372 if (disk->d_sync.ds_syncid != syncid) 2373 continue; 2374 if ((disk->d_flags & 2375 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2376 continue; 2377 } 2378 ndisks++; 2379 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 2380 dirty++; 2381 if (pdisk == NULL || 2382 pdisk->d_priority < disk->d_priority) { 2383 pdisk = disk; 2384 } 2385 } 2386 } 2387 if (dirty == 0) { 2388 /* No dirty disks at all, great. */ 2389 } else if (dirty == ndisks) { 2390 /* 2391 * Force synchronization for all dirty disks except one 2392 * with the biggest priority. 2393 */ 2394 KASSERT(pdisk != NULL, ("pdisk == NULL")); 2395 G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a " 2396 "master disk for synchronization.", 2397 g_mirror_get_diskname(pdisk), sc->sc_name); 2398 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2399 if (disk->d_sync.ds_syncid != syncid) 2400 continue; 2401 if ((disk->d_flags & 2402 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2403 continue; 2404 } 2405 KASSERT((disk->d_flags & 2406 G_MIRROR_DISK_FLAG_DIRTY) != 0, 2407 ("Disk %s isn't marked as dirty.", 2408 g_mirror_get_diskname(disk))); 2409 /* Skip the disk with the biggest priority. */ 2410 if (disk == pdisk) 2411 continue; 2412 disk->d_sync.ds_syncid = 0; 2413 } 2414 } else if (dirty < ndisks) { 2415 /* 2416 * Force synchronization for all dirty disks. 2417 * We have some non-dirty disks. 2418 */ 2419 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2420 if (disk->d_sync.ds_syncid != syncid) 2421 continue; 2422 if ((disk->d_flags & 2423 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2424 continue; 2425 } 2426 if ((disk->d_flags & 2427 G_MIRROR_DISK_FLAG_DIRTY) == 0) { 2428 continue; 2429 } 2430 disk->d_sync.ds_syncid = 0; 2431 } 2432 } 2433 2434 /* Reset hint. */ 2435 sc->sc_hint = NULL; 2436 sc->sc_syncid = syncid; 2437 if (force) { 2438 /* Remember to bump syncid on first write. */ 2439 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2440 } 2441 state = G_MIRROR_DEVICE_STATE_RUNNING; 2442 G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.", 2443 sc->sc_name, g_mirror_device_state2str(sc->sc_state), 2444 g_mirror_device_state2str(state)); 2445 sc->sc_state = state; 2446 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2447 state = g_mirror_determine_state(disk); 2448 g_mirror_event_send(disk, state, 2449 G_MIRROR_EVENT_DONTWAIT); 2450 if (state == G_MIRROR_DISK_STATE_STALE) 2451 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2452 } 2453 break; 2454 } 2455 case G_MIRROR_DEVICE_STATE_RUNNING: 2456 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 && 2457 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2458 /* 2459 * No active disks or no disks at all, 2460 * so destroy device. 2461 */ 2462 if (sc->sc_provider != NULL) 2463 g_mirror_destroy_provider(sc); 2464 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2465 break; 2466 } else if (g_mirror_ndisks(sc, 2467 G_MIRROR_DISK_STATE_ACTIVE) > 0 && 2468 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2469 /* 2470 * We have active disks, launch provider if it doesn't 2471 * exist. 2472 */ 2473 if (sc->sc_provider == NULL) 2474 g_mirror_launch_provider(sc); 2475 if (sc->sc_rootmount != NULL) { 2476 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2477 __LINE__, sc->sc_rootmount); 2478 root_mount_rel(sc->sc_rootmount); 2479 sc->sc_rootmount = NULL; 2480 } 2481 } 2482 /* 2483 * Genid should be bumped immediately, so do it here. 2484 */ 2485 if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID) != 0) { 2486 sc->sc_bump_id &= ~G_MIRROR_BUMP_GENID; 2487 g_mirror_bump_genid(sc); 2488 } 2489 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID_NOW) != 0) { 2490 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID_NOW; 2491 g_mirror_bump_syncid(sc); 2492 } 2493 break; 2494 default: 2495 KASSERT(1 == 0, ("Wrong device state (%s, %s).", 2496 sc->sc_name, g_mirror_device_state2str(sc->sc_state))); 2497 break; 2498 } 2499} 2500 2501/* 2502 * Update disk state and device state if needed. 2503 */ 2504#define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \ 2505 "Disk %s state changed from %s to %s (device %s).", \ 2506 g_mirror_get_diskname(disk), \ 2507 g_mirror_disk_state2str(disk->d_state), \ 2508 g_mirror_disk_state2str(state), sc->sc_name) 2509static int 2510g_mirror_update_disk(struct g_mirror_disk *disk, u_int state) 2511{ 2512 struct g_mirror_softc *sc; 2513 2514 sc = disk->d_softc; 2515 sx_assert(&sc->sc_lock, SX_XLOCKED); 2516 2517again: 2518 G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.", 2519 g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state), 2520 g_mirror_disk_state2str(state)); 2521 switch (state) { 2522 case G_MIRROR_DISK_STATE_NEW: 2523 /* 2524 * Possible scenarios: 2525 * 1. New disk arrive. 2526 */ 2527 /* Previous state should be NONE. */ 2528 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE, 2529 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2530 g_mirror_disk_state2str(disk->d_state))); 2531 DISK_STATE_CHANGED(); 2532 2533 disk->d_state = state; 2534 if (LIST_EMPTY(&sc->sc_disks)) 2535 LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next); 2536 else { 2537 struct g_mirror_disk *dp; 2538 2539 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 2540 if (disk->d_priority >= dp->d_priority) { 2541 LIST_INSERT_BEFORE(dp, disk, d_next); 2542 dp = NULL; 2543 break; 2544 } 2545 if (LIST_NEXT(dp, d_next) == NULL) 2546 break; 2547 } 2548 if (dp != NULL) 2549 LIST_INSERT_AFTER(dp, disk, d_next); 2550 } 2551 G_MIRROR_DEBUG(1, "Device %s: provider %s detected.", 2552 sc->sc_name, g_mirror_get_diskname(disk)); 2553 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 2554 break; 2555 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2556 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2557 g_mirror_device_state2str(sc->sc_state), 2558 g_mirror_get_diskname(disk), 2559 g_mirror_disk_state2str(disk->d_state))); 2560 state = g_mirror_determine_state(disk); 2561 if (state != G_MIRROR_DISK_STATE_NONE) 2562 goto again; 2563 break; 2564 case G_MIRROR_DISK_STATE_ACTIVE: 2565 /* 2566 * Possible scenarios: 2567 * 1. New disk does not need synchronization. 2568 * 2. Synchronization process finished successfully. 2569 */ 2570 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2571 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2572 g_mirror_device_state2str(sc->sc_state), 2573 g_mirror_get_diskname(disk), 2574 g_mirror_disk_state2str(disk->d_state))); 2575 /* Previous state should be NEW or SYNCHRONIZING. */ 2576 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW || 2577 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2578 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2579 g_mirror_disk_state2str(disk->d_state))); 2580 DISK_STATE_CHANGED(); 2581 2582 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2583 disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2584 disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC; 2585 g_mirror_sync_stop(disk, 0); 2586 } 2587 disk->d_state = state; 2588 disk->d_sync.ds_offset = 0; 2589 disk->d_sync.ds_offset_done = 0; 2590 g_mirror_update_idle(sc, disk); 2591 g_mirror_update_metadata(disk); 2592 G_MIRROR_DEBUG(1, "Device %s: provider %s activated.", 2593 sc->sc_name, g_mirror_get_diskname(disk)); 2594 break; 2595 case G_MIRROR_DISK_STATE_STALE: 2596 /* 2597 * Possible scenarios: 2598 * 1. Stale disk was connected. 2599 */ 2600 /* Previous state should be NEW. */ 2601 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2602 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2603 g_mirror_disk_state2str(disk->d_state))); 2604 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2605 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2606 g_mirror_device_state2str(sc->sc_state), 2607 g_mirror_get_diskname(disk), 2608 g_mirror_disk_state2str(disk->d_state))); 2609 /* 2610 * STALE state is only possible if device is marked 2611 * NOAUTOSYNC. 2612 */ 2613 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0, 2614 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2615 g_mirror_device_state2str(sc->sc_state), 2616 g_mirror_get_diskname(disk), 2617 g_mirror_disk_state2str(disk->d_state))); 2618 DISK_STATE_CHANGED(); 2619 2620 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2621 disk->d_state = state; 2622 g_mirror_update_metadata(disk); 2623 G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.", 2624 sc->sc_name, g_mirror_get_diskname(disk)); 2625 break; 2626 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 2627 /* 2628 * Possible scenarios: 2629 * 1. Disk which needs synchronization was connected. 2630 */ 2631 /* Previous state should be NEW. */ 2632 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2633 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2634 g_mirror_disk_state2str(disk->d_state))); 2635 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2636 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2637 g_mirror_device_state2str(sc->sc_state), 2638 g_mirror_get_diskname(disk), 2639 g_mirror_disk_state2str(disk->d_state))); 2640 DISK_STATE_CHANGED(); 2641 2642 if (disk->d_state == G_MIRROR_DISK_STATE_NEW) 2643 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2644 disk->d_state = state; 2645 if (sc->sc_provider != NULL) { 2646 g_mirror_sync_start(disk); 2647 g_mirror_update_metadata(disk); 2648 } 2649 break; 2650 case G_MIRROR_DISK_STATE_DISCONNECTED: 2651 /* 2652 * Possible scenarios: 2653 * 1. Device wasn't running yet, but disk disappear. 2654 * 2. Disk was active and disapppear. 2655 * 3. Disk disappear during synchronization process. 2656 */ 2657 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) { 2658 /* 2659 * Previous state should be ACTIVE, STALE or 2660 * SYNCHRONIZING. 2661 */ 2662 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 2663 disk->d_state == G_MIRROR_DISK_STATE_STALE || 2664 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2665 ("Wrong disk state (%s, %s).", 2666 g_mirror_get_diskname(disk), 2667 g_mirror_disk_state2str(disk->d_state))); 2668 } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) { 2669 /* Previous state should be NEW. */ 2670 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2671 ("Wrong disk state (%s, %s).", 2672 g_mirror_get_diskname(disk), 2673 g_mirror_disk_state2str(disk->d_state))); 2674 /* 2675 * Reset bumping syncid if disk disappeared in STARTING 2676 * state. 2677 */ 2678 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) 2679 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 2680#ifdef INVARIANTS 2681 } else { 2682 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).", 2683 sc->sc_name, 2684 g_mirror_device_state2str(sc->sc_state), 2685 g_mirror_get_diskname(disk), 2686 g_mirror_disk_state2str(disk->d_state))); 2687#endif 2688 } 2689 DISK_STATE_CHANGED(); 2690 G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.", 2691 sc->sc_name, g_mirror_get_diskname(disk)); 2692 2693 g_mirror_destroy_disk(disk); 2694 break; 2695 case G_MIRROR_DISK_STATE_DESTROY: 2696 { 2697 int error; 2698 2699 error = g_mirror_clear_metadata(disk); 2700 if (error != 0) { 2701 G_MIRROR_DEBUG(0, 2702 "Device %s: failed to clear metadata on %s: %d.", 2703 sc->sc_name, g_mirror_get_diskname(disk), error); 2704 break; 2705 } 2706 DISK_STATE_CHANGED(); 2707 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", 2708 sc->sc_name, g_mirror_get_diskname(disk)); 2709 2710 g_mirror_destroy_disk(disk); 2711 sc->sc_ndisks--; 2712 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2713 g_mirror_update_metadata(disk); 2714 } 2715 break; 2716 } 2717 default: 2718 KASSERT(1 == 0, ("Unknown state (%u).", state)); 2719 break; 2720 } 2721 return (0); 2722} 2723#undef DISK_STATE_CHANGED 2724 2725int 2726g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md) 2727{ 2728 struct g_provider *pp; 2729 u_char *buf; 2730 int error; 2731 2732 g_topology_assert(); 2733 2734 error = g_access(cp, 1, 0, 0); 2735 if (error != 0) 2736 return (error); 2737 pp = cp->provider; 2738 g_topology_unlock(); 2739 /* Metadata are stored on last sector. */ 2740 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 2741 &error); 2742 g_topology_lock(); 2743 g_access(cp, -1, 0, 0); 2744 if (buf == NULL) { 2745 G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).", 2746 cp->provider->name, error); 2747 return (error); 2748 } 2749 2750 /* Decode metadata. */ 2751 error = mirror_metadata_decode(buf, md); 2752 g_free(buf); 2753 if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0) 2754 return (EINVAL); 2755 if (md->md_version > G_MIRROR_VERSION) { 2756 G_MIRROR_DEBUG(0, 2757 "Kernel module is too old to handle metadata from %s.", 2758 cp->provider->name); 2759 return (EINVAL); 2760 } 2761 if (error != 0) { 2762 G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.", 2763 cp->provider->name); 2764 return (error); 2765 } 2766 2767 return (0); 2768} 2769 2770static int 2771g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp, 2772 struct g_mirror_metadata *md) 2773{ 2774 2775 if (g_mirror_id2disk(sc, md->md_did) != NULL) { 2776 G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.", 2777 pp->name, md->md_did); 2778 return (EEXIST); 2779 } 2780 if (md->md_all != sc->sc_ndisks) { 2781 G_MIRROR_DEBUG(1, 2782 "Invalid '%s' field on disk %s (device %s), skipping.", 2783 "md_all", pp->name, sc->sc_name); 2784 return (EINVAL); 2785 } 2786 if (md->md_slice != sc->sc_slice) { 2787 G_MIRROR_DEBUG(1, 2788 "Invalid '%s' field on disk %s (device %s), skipping.", 2789 "md_slice", pp->name, sc->sc_name); 2790 return (EINVAL); 2791 } 2792 if (md->md_balance != sc->sc_balance) { 2793 G_MIRROR_DEBUG(1, 2794 "Invalid '%s' field on disk %s (device %s), skipping.", 2795 "md_balance", pp->name, sc->sc_name); 2796 return (EINVAL); 2797 } 2798#if 0 2799 if (md->md_mediasize != sc->sc_mediasize) { 2800 G_MIRROR_DEBUG(1, 2801 "Invalid '%s' field on disk %s (device %s), skipping.", 2802 "md_mediasize", pp->name, sc->sc_name); 2803 return (EINVAL); 2804 } 2805#endif 2806 if (sc->sc_mediasize > pp->mediasize) { 2807 G_MIRROR_DEBUG(1, 2808 "Invalid size of disk %s (device %s), skipping.", pp->name, 2809 sc->sc_name); 2810 return (EINVAL); 2811 } 2812 if (md->md_sectorsize != sc->sc_sectorsize) { 2813 G_MIRROR_DEBUG(1, 2814 "Invalid '%s' field on disk %s (device %s), skipping.", 2815 "md_sectorsize", pp->name, sc->sc_name); 2816 return (EINVAL); 2817 } 2818 if ((sc->sc_sectorsize % pp->sectorsize) != 0) { 2819 G_MIRROR_DEBUG(1, 2820 "Invalid sector size of disk %s (device %s), skipping.", 2821 pp->name, sc->sc_name); 2822 return (EINVAL); 2823 } 2824 if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) { 2825 G_MIRROR_DEBUG(1, 2826 "Invalid device flags on disk %s (device %s), skipping.", 2827 pp->name, sc->sc_name); 2828 return (EINVAL); 2829 } 2830 if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) { 2831 G_MIRROR_DEBUG(1, 2832 "Invalid disk flags on disk %s (device %s), skipping.", 2833 pp->name, sc->sc_name); 2834 return (EINVAL); 2835 } 2836 return (0); 2837} 2838 2839int 2840g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp, 2841 struct g_mirror_metadata *md) 2842{ 2843 struct g_mirror_disk *disk; 2844 int error; 2845 2846 g_topology_assert_not(); 2847 G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name); 2848 2849 error = g_mirror_check_metadata(sc, pp, md); 2850 if (error != 0) 2851 return (error); 2852 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING && 2853 md->md_genid < sc->sc_genid) { 2854 G_MIRROR_DEBUG(0, "Component %s (device %s) broken, skipping.", 2855 pp->name, sc->sc_name); 2856 return (EINVAL); 2857 } 2858 disk = g_mirror_init_disk(sc, pp, md, &error); 2859 if (disk == NULL) 2860 return (error); 2861 error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW, 2862 G_MIRROR_EVENT_WAIT); 2863 if (error != 0) 2864 return (error); 2865 if (md->md_version < G_MIRROR_VERSION) { 2866 G_MIRROR_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).", 2867 pp->name, md->md_version, G_MIRROR_VERSION); 2868 g_mirror_update_metadata(disk); 2869 } 2870 return (0); 2871} 2872 2873static void 2874g_mirror_destroy_delayed(void *arg, int flag) 2875{ 2876 struct g_mirror_softc *sc; 2877 int error; 2878 2879 if (flag == EV_CANCEL) { 2880 G_MIRROR_DEBUG(1, "Destroying canceled."); 2881 return; 2882 } 2883 sc = arg; 2884 g_topology_unlock(); 2885 sx_xlock(&sc->sc_lock); 2886 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) == 0, 2887 ("DESTROY flag set on %s.", sc->sc_name)); 2888 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0, 2889 ("DESTROYING flag not set on %s.", sc->sc_name)); 2890 G_MIRROR_DEBUG(1, "Destroying %s (delayed).", sc->sc_name); 2891 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_SOFT); 2892 if (error != 0) { 2893 G_MIRROR_DEBUG(0, "Cannot destroy %s (error=%d).", 2894 sc->sc_name, error); 2895 sx_xunlock(&sc->sc_lock); 2896 } 2897 g_topology_lock(); 2898} 2899 2900static int 2901g_mirror_access(struct g_provider *pp, int acr, int acw, int ace) 2902{ 2903 struct g_mirror_softc *sc; 2904 int error = 0; 2905 2906 g_topology_assert(); 2907 G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr, 2908 acw, ace); 2909 2910 sc = pp->private; 2911 KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name)); 2912 2913 g_topology_unlock(); 2914 sx_xlock(&sc->sc_lock); 2915 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0 || 2916 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0 || 2917 LIST_EMPTY(&sc->sc_disks)) { 2918 if (acr > 0 || acw > 0 || ace > 0) 2919 error = ENXIO; 2920 goto end; 2921 } 2922 sc->sc_provider_open += acr + acw + ace; 2923 if (pp->acw + acw == 0) 2924 g_mirror_idle(sc, 0); 2925 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0 && 2926 sc->sc_provider_open == 0) 2927 g_post_event(g_mirror_destroy_delayed, sc, M_WAITOK, sc, NULL); 2928end: 2929 sx_xunlock(&sc->sc_lock); 2930 g_topology_lock(); 2931 return (error); 2932} 2933 2934static struct g_geom * 2935g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md) 2936{ 2937 struct g_mirror_softc *sc; 2938 struct g_geom *gp; 2939 int error, timeout; 2940 2941 g_topology_assert(); 2942 G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name, 2943 md->md_mid); 2944 2945 /* One disk is minimum. */ 2946 if (md->md_all < 1) 2947 return (NULL); 2948 /* 2949 * Action geom. 2950 */ 2951 gp = g_new_geomf(mp, "%s", md->md_name); 2952 sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO); 2953 gp->start = g_mirror_start; 2954 gp->orphan = g_mirror_orphan; 2955 gp->access = g_mirror_access; 2956 gp->dumpconf = g_mirror_dumpconf; 2957 2958 sc->sc_id = md->md_mid; 2959 sc->sc_slice = md->md_slice; 2960 sc->sc_balance = md->md_balance; 2961 sc->sc_mediasize = md->md_mediasize; 2962 sc->sc_sectorsize = md->md_sectorsize; 2963 sc->sc_ndisks = md->md_all; 2964 sc->sc_flags = md->md_mflags; 2965 sc->sc_bump_id = 0; 2966 sc->sc_idle = 1; 2967 sc->sc_last_write = time_uptime; 2968 sc->sc_writes = 0; 2969 sc->sc_refcnt = 1; 2970 sx_init(&sc->sc_lock, "gmirror:lock"); 2971 bioq_init(&sc->sc_queue); 2972 mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF); 2973 bioq_init(&sc->sc_regular_delayed); 2974 bioq_init(&sc->sc_inflight); 2975 bioq_init(&sc->sc_sync_delayed); 2976 LIST_INIT(&sc->sc_disks); 2977 TAILQ_INIT(&sc->sc_events); 2978 mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF); 2979 callout_init(&sc->sc_callout, 1); 2980 mtx_init(&sc->sc_done_mtx, "gmirror:done", NULL, MTX_DEF); 2981 sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING; 2982 gp->softc = sc; 2983 sc->sc_geom = gp; 2984 sc->sc_provider = NULL; 2985 sc->sc_provider_open = 0; 2986 /* 2987 * Synchronization geom. 2988 */ 2989 gp = g_new_geomf(mp, "%s.sync", md->md_name); 2990 gp->softc = sc; 2991 gp->orphan = g_mirror_orphan; 2992 sc->sc_sync.ds_geom = gp; 2993 sc->sc_sync.ds_ndisks = 0; 2994 error = kproc_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0, 2995 "g_mirror %s", md->md_name); 2996 if (error != 0) { 2997 G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.", 2998 sc->sc_name); 2999 g_destroy_geom(sc->sc_sync.ds_geom); 3000 g_destroy_geom(sc->sc_geom); 3001 g_mirror_free_device(sc); 3002 return (NULL); 3003 } 3004 3005 G_MIRROR_DEBUG(1, "Device %s created (%u components, id=%u).", 3006 sc->sc_name, sc->sc_ndisks, sc->sc_id); 3007 3008 sc->sc_rootmount = root_mount_hold("GMIRROR"); 3009 G_MIRROR_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount); 3010 /* 3011 * Run timeout. 3012 */ 3013 timeout = g_mirror_timeout * hz; 3014 callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc); 3015 return (sc->sc_geom); 3016} 3017 3018int 3019g_mirror_destroy(struct g_mirror_softc *sc, int how) 3020{ 3021 struct g_mirror_disk *disk; 3022 3023 g_topology_assert_not(); 3024 sx_assert(&sc->sc_lock, SX_XLOCKED); 3025 3026 if (sc->sc_provider_open != 0) { 3027 switch (how) { 3028 case G_MIRROR_DESTROY_SOFT: 3029 G_MIRROR_DEBUG(1, 3030 "Device %s is still open (%d).", sc->sc_name, 3031 sc->sc_provider_open); 3032 return (EBUSY); 3033 case G_MIRROR_DESTROY_DELAYED: 3034 G_MIRROR_DEBUG(1, 3035 "Device %s will be destroyed on last close.", 3036 sc->sc_name); 3037 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 3038 if (disk->d_state == 3039 G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3040 g_mirror_sync_stop(disk, 1); 3041 } 3042 } 3043 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROYING; 3044 return (EBUSY); 3045 case G_MIRROR_DESTROY_HARD: 3046 G_MIRROR_DEBUG(1, "Device %s is still open, so it " 3047 "can't be definitely removed.", sc->sc_name); 3048 } 3049 } 3050 3051 g_topology_lock(); 3052 if (sc->sc_geom->softc == NULL) { 3053 g_topology_unlock(); 3054 return (0); 3055 } 3056 sc->sc_geom->softc = NULL; 3057 sc->sc_sync.ds_geom->softc = NULL; 3058 g_topology_unlock(); 3059 3060 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 3061 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_WAIT; 3062 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 3063 sx_xunlock(&sc->sc_lock); 3064 mtx_lock(&sc->sc_queue_mtx); 3065 wakeup(sc); 3066 mtx_unlock(&sc->sc_queue_mtx); 3067 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker); 3068 while (sc->sc_worker != NULL) 3069 tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5); 3070 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker); 3071 sx_xlock(&sc->sc_lock); 3072 g_mirror_destroy_device(sc); 3073 return (0); 3074} 3075 3076static void 3077g_mirror_taste_orphan(struct g_consumer *cp) 3078{ 3079 3080 KASSERT(1 == 0, ("%s called while tasting %s.", __func__, 3081 cp->provider->name)); 3082} 3083 3084static struct g_geom * 3085g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 3086{ 3087 struct g_mirror_metadata md; 3088 struct g_mirror_softc *sc; 3089 struct g_consumer *cp; 3090 struct g_geom *gp; 3091 int error; 3092 3093 g_topology_assert(); 3094 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 3095 G_MIRROR_DEBUG(2, "Tasting %s.", pp->name); 3096 3097 gp = g_new_geomf(mp, "mirror:taste"); 3098 /* 3099 * This orphan function should be never called. 3100 */ 3101 gp->orphan = g_mirror_taste_orphan; 3102 cp = g_new_consumer(gp); 3103 g_attach(cp, pp); 3104 error = g_mirror_read_metadata(cp, &md); 3105 g_detach(cp); 3106 g_destroy_consumer(cp); 3107 g_destroy_geom(gp); 3108 if (error != 0) 3109 return (NULL); 3110 gp = NULL; 3111 3112 if (md.md_provider[0] != '\0' && 3113 !g_compare_names(md.md_provider, pp->name)) 3114 return (NULL); 3115 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize) 3116 return (NULL); 3117 if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) { 3118 G_MIRROR_DEBUG(0, 3119 "Device %s: provider %s marked as inactive, skipping.", 3120 md.md_name, pp->name); 3121 return (NULL); 3122 } 3123 if (g_mirror_debug >= 2) 3124 mirror_metadata_dump(&md); 3125 3126 /* 3127 * Let's check if device already exists. 3128 */ 3129 sc = NULL; 3130 LIST_FOREACH(gp, &mp->geom, geom) { 3131 sc = gp->softc; 3132 if (sc == NULL) 3133 continue; 3134 if (sc->sc_sync.ds_geom == gp) 3135 continue; 3136 if (strcmp(md.md_name, sc->sc_name) != 0) 3137 continue; 3138 if (md.md_mid != sc->sc_id) { 3139 G_MIRROR_DEBUG(0, "Device %s already configured.", 3140 sc->sc_name); 3141 return (NULL); 3142 } 3143 break; 3144 } 3145 if (gp == NULL) { 3146 gp = g_mirror_create(mp, &md); 3147 if (gp == NULL) { 3148 G_MIRROR_DEBUG(0, "Cannot create device %s.", 3149 md.md_name); 3150 return (NULL); 3151 } 3152 sc = gp->softc; 3153 } 3154 G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name); 3155 g_topology_unlock(); 3156 sx_xlock(&sc->sc_lock); 3157 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_TASTING; 3158 error = g_mirror_add_disk(sc, pp, &md); 3159 if (error != 0) { 3160 G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).", 3161 pp->name, gp->name, error); 3162 if (LIST_EMPTY(&sc->sc_disks)) { 3163 g_cancel_event(sc); 3164 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3165 g_topology_lock(); 3166 return (NULL); 3167 } 3168 gp = NULL; 3169 } 3170 sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_TASTING; 3171 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 3172 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3173 g_topology_lock(); 3174 return (NULL); 3175 } 3176 sx_xunlock(&sc->sc_lock); 3177 g_topology_lock(); 3178 return (gp); 3179} 3180 3181static void 3182g_mirror_resize(struct g_consumer *cp) 3183{ 3184 struct g_mirror_disk *disk; 3185 3186 g_topology_assert(); 3187 g_trace(G_T_TOPOLOGY, "%s(%s)", __func__, cp->provider->name); 3188 3189 disk = cp->private; 3190 if (disk == NULL) 3191 return; 3192 g_topology_unlock(); 3193 g_mirror_update_metadata(disk); 3194 g_topology_lock(); 3195} 3196 3197static int 3198g_mirror_destroy_geom(struct gctl_req *req __unused, 3199 struct g_class *mp __unused, struct g_geom *gp) 3200{ 3201 struct g_mirror_softc *sc; 3202 int error; 3203 3204 g_topology_unlock(); 3205 sc = gp->softc; 3206 sx_xlock(&sc->sc_lock); 3207 g_cancel_event(sc); 3208 error = g_mirror_destroy(gp->softc, G_MIRROR_DESTROY_SOFT); 3209 if (error != 0) 3210 sx_xunlock(&sc->sc_lock); 3211 g_topology_lock(); 3212 return (error); 3213} 3214 3215static void 3216g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 3217 struct g_consumer *cp, struct g_provider *pp) 3218{ 3219 struct g_mirror_softc *sc; 3220 3221 g_topology_assert(); 3222 3223 sc = gp->softc; 3224 if (sc == NULL) 3225 return; 3226 /* Skip synchronization geom. */ 3227 if (gp == sc->sc_sync.ds_geom) 3228 return; 3229 if (pp != NULL) { 3230 /* Nothing here. */ 3231 } else if (cp != NULL) { 3232 struct g_mirror_disk *disk; 3233 3234 disk = cp->private; 3235 if (disk == NULL) 3236 return; 3237 g_topology_unlock(); 3238 sx_xlock(&sc->sc_lock); 3239 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id); 3240 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3241 sbuf_printf(sb, "%s<Synchronized>", indent); 3242 if (disk->d_sync.ds_offset == 0) 3243 sbuf_printf(sb, "0%%"); 3244 else { 3245 sbuf_printf(sb, "%u%%", 3246 (u_int)((disk->d_sync.ds_offset * 100) / 3247 sc->sc_provider->mediasize)); 3248 } 3249 sbuf_printf(sb, "</Synchronized>\n"); 3250 if (disk->d_sync.ds_offset > 0) { 3251 sbuf_printf(sb, "%s<BytesSynced>%jd" 3252 "</BytesSynced>\n", indent, 3253 (intmax_t)disk->d_sync.ds_offset); 3254 } 3255 } 3256 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, 3257 disk->d_sync.ds_syncid); 3258 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, 3259 disk->d_genid); 3260 sbuf_printf(sb, "%s<Flags>", indent); 3261 if (disk->d_flags == 0) 3262 sbuf_printf(sb, "NONE"); 3263 else { 3264 int first = 1; 3265 3266#define ADD_FLAG(flag, name) do { \ 3267 if ((disk->d_flags & (flag)) != 0) { \ 3268 if (!first) \ 3269 sbuf_printf(sb, ", "); \ 3270 else \ 3271 first = 0; \ 3272 sbuf_printf(sb, name); \ 3273 } \ 3274} while (0) 3275 ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY"); 3276 ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED"); 3277 ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE"); 3278 ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING, 3279 "SYNCHRONIZING"); 3280 ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC"); 3281 ADD_FLAG(G_MIRROR_DISK_FLAG_BROKEN, "BROKEN"); 3282#undef ADD_FLAG 3283 } 3284 sbuf_printf(sb, "</Flags>\n"); 3285 sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent, 3286 disk->d_priority); 3287 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 3288 g_mirror_disk_state2str(disk->d_state)); 3289 sx_xunlock(&sc->sc_lock); 3290 g_topology_lock(); 3291 } else { 3292 g_topology_unlock(); 3293 sx_xlock(&sc->sc_lock); 3294 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id); 3295 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid); 3296 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid); 3297 sbuf_printf(sb, "%s<Flags>", indent); 3298 if (sc->sc_flags == 0) 3299 sbuf_printf(sb, "NONE"); 3300 else { 3301 int first = 1; 3302 3303#define ADD_FLAG(flag, name) do { \ 3304 if ((sc->sc_flags & (flag)) != 0) { \ 3305 if (!first) \ 3306 sbuf_printf(sb, ", "); \ 3307 else \ 3308 first = 0; \ 3309 sbuf_printf(sb, name); \ 3310 } \ 3311} while (0) 3312 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC"); 3313 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC"); 3314#undef ADD_FLAG 3315 } 3316 sbuf_printf(sb, "</Flags>\n"); 3317 sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent, 3318 (u_int)sc->sc_slice); 3319 sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent, 3320 balance_name(sc->sc_balance)); 3321 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent, 3322 sc->sc_ndisks); 3323 sbuf_printf(sb, "%s<State>", indent); 3324 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 3325 sbuf_printf(sb, "%s", "STARTING"); 3326 else if (sc->sc_ndisks == 3327 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE)) 3328 sbuf_printf(sb, "%s", "COMPLETE"); 3329 else 3330 sbuf_printf(sb, "%s", "DEGRADED"); 3331 sbuf_printf(sb, "</State>\n"); 3332 sx_xunlock(&sc->sc_lock); 3333 g_topology_lock(); 3334 } 3335} 3336 3337static void 3338g_mirror_shutdown_post_sync(void *arg, int howto) 3339{ 3340 struct g_class *mp; 3341 struct g_geom *gp, *gp2; 3342 struct g_mirror_softc *sc; 3343 int error; 3344 3345 mp = arg; 3346 DROP_GIANT(); 3347 g_topology_lock(); 3348 g_mirror_shutdown = 1; 3349 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 3350 if ((sc = gp->softc) == NULL) 3351 continue; 3352 /* Skip synchronization geom. */ 3353 if (gp == sc->sc_sync.ds_geom) 3354 continue; 3355 g_topology_unlock(); 3356 sx_xlock(&sc->sc_lock); 3357 g_mirror_idle(sc, -1); 3358 g_cancel_event(sc); 3359 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_DELAYED); 3360 if (error != 0) 3361 sx_xunlock(&sc->sc_lock); 3362 g_topology_lock(); 3363 } 3364 g_topology_unlock(); 3365 PICKUP_GIANT(); 3366} 3367 3368static void 3369g_mirror_init(struct g_class *mp) 3370{ 3371 3372 g_mirror_post_sync = EVENTHANDLER_REGISTER(shutdown_post_sync, 3373 g_mirror_shutdown_post_sync, mp, SHUTDOWN_PRI_FIRST); 3374 if (g_mirror_post_sync == NULL) 3375 G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event."); 3376} 3377 3378static void 3379g_mirror_fini(struct g_class *mp) 3380{ 3381 3382 if (g_mirror_post_sync != NULL) 3383 EVENTHANDLER_DEREGISTER(shutdown_post_sync, g_mirror_post_sync); 3384} 3385 3386DECLARE_GEOM_CLASS(g_mirror_class, g_mirror); 3387