g_mirror.c revision 309206
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 309206 2016-11-27 05:59:17Z mav $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/kernel.h> 33#include <sys/module.h> 34#include <sys/limits.h> 35#include <sys/lock.h> 36#include <sys/mutex.h> 37#include <sys/bio.h> 38#include <sys/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 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 979 g_mirror_event_send(disk, 980 G_MIRROR_DISK_STATE_DISCONNECTED, 981 G_MIRROR_EVENT_DONTWAIT); 982 } 983 } 984 switch (pbp->bio_cmd) { 985 case BIO_DELETE: 986 case BIO_WRITE: 987 pbp->bio_inbed--; 988 pbp->bio_children--; 989 break; 990 } 991 } 992 g_destroy_bio(bp); 993 994 switch (pbp->bio_cmd) { 995 case BIO_READ: 996 if (pbp->bio_inbed < pbp->bio_children) 997 break; 998 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 1) 999 g_io_deliver(pbp, pbp->bio_error); 1000 else { 1001 pbp->bio_error = 0; 1002 mtx_lock(&sc->sc_queue_mtx); 1003 bioq_insert_tail(&sc->sc_queue, pbp); 1004 mtx_unlock(&sc->sc_queue_mtx); 1005 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 1006 wakeup(sc); 1007 } 1008 break; 1009 case BIO_DELETE: 1010 case BIO_WRITE: 1011 if (pbp->bio_children == 0) { 1012 /* 1013 * All requests failed. 1014 */ 1015 } else if (pbp->bio_inbed < pbp->bio_children) { 1016 /* Do nothing. */ 1017 break; 1018 } else if (pbp->bio_children == pbp->bio_inbed) { 1019 /* Some requests succeeded. */ 1020 pbp->bio_error = 0; 1021 pbp->bio_completed = pbp->bio_length; 1022 } 1023 bioq_remove(&sc->sc_inflight, pbp); 1024 /* Release delayed sync requests if possible. */ 1025 g_mirror_sync_release(sc); 1026 g_io_deliver(pbp, pbp->bio_error); 1027 break; 1028 default: 1029 KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd)); 1030 break; 1031 } 1032} 1033 1034static void 1035g_mirror_sync_done(struct bio *bp) 1036{ 1037 struct g_mirror_softc *sc; 1038 1039 G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered."); 1040 sc = bp->bio_from->geom->softc; 1041 bp->bio_cflags = G_MIRROR_BIO_FLAG_SYNC; 1042 mtx_lock(&sc->sc_queue_mtx); 1043 bioq_insert_tail(&sc->sc_queue, bp); 1044 mtx_unlock(&sc->sc_queue_mtx); 1045 wakeup(sc); 1046} 1047 1048static void 1049g_mirror_candelete(struct bio *bp) 1050{ 1051 struct g_mirror_softc *sc; 1052 struct g_mirror_disk *disk; 1053 int *val; 1054 1055 sc = bp->bio_to->private; 1056 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1057 if (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) 1058 break; 1059 } 1060 val = (int *)bp->bio_data; 1061 *val = (disk != NULL); 1062 g_io_deliver(bp, 0); 1063} 1064 1065static void 1066g_mirror_kernel_dump(struct bio *bp) 1067{ 1068 struct g_mirror_softc *sc; 1069 struct g_mirror_disk *disk; 1070 struct bio *cbp; 1071 struct g_kerneldump *gkd; 1072 1073 /* 1074 * We configure dumping to the first component, because this component 1075 * will be used for reading with 'prefer' balance algorithm. 1076 * If the component with the higest priority is currently disconnected 1077 * we will not be able to read the dump after the reboot if it will be 1078 * connected and synchronized later. Can we do something better? 1079 */ 1080 sc = bp->bio_to->private; 1081 disk = LIST_FIRST(&sc->sc_disks); 1082 1083 gkd = (struct g_kerneldump *)bp->bio_data; 1084 if (gkd->length > bp->bio_to->mediasize) 1085 gkd->length = bp->bio_to->mediasize; 1086 cbp = g_clone_bio(bp); 1087 if (cbp == NULL) { 1088 g_io_deliver(bp, ENOMEM); 1089 return; 1090 } 1091 cbp->bio_done = g_std_done; 1092 g_io_request(cbp, disk->d_consumer); 1093 G_MIRROR_DEBUG(1, "Kernel dump will go to %s.", 1094 g_mirror_get_diskname(disk)); 1095} 1096 1097static void 1098g_mirror_flush(struct g_mirror_softc *sc, struct bio *bp) 1099{ 1100 struct bio_queue_head queue; 1101 struct g_mirror_disk *disk; 1102 struct g_consumer *cp; 1103 struct bio *cbp; 1104 1105 bioq_init(&queue); 1106 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1107 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1108 continue; 1109 cbp = g_clone_bio(bp); 1110 if (cbp == NULL) { 1111 while ((cbp = bioq_takefirst(&queue)) != NULL) 1112 g_destroy_bio(cbp); 1113 if (bp->bio_error == 0) 1114 bp->bio_error = ENOMEM; 1115 g_io_deliver(bp, bp->bio_error); 1116 return; 1117 } 1118 bioq_insert_tail(&queue, cbp); 1119 cbp->bio_done = g_mirror_flush_done; 1120 cbp->bio_caller1 = disk; 1121 cbp->bio_to = disk->d_consumer->provider; 1122 } 1123 while ((cbp = bioq_takefirst(&queue)) != NULL) { 1124 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1125 disk = cbp->bio_caller1; 1126 cbp->bio_caller1 = NULL; 1127 cp = disk->d_consumer; 1128 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1129 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1130 cp->acr, cp->acw, cp->ace)); 1131 g_io_request(cbp, disk->d_consumer); 1132 } 1133} 1134 1135static void 1136g_mirror_start(struct bio *bp) 1137{ 1138 struct g_mirror_softc *sc; 1139 1140 sc = bp->bio_to->private; 1141 /* 1142 * If sc == NULL or there are no valid disks, provider's error 1143 * should be set and g_mirror_start() should not be called at all. 1144 */ 1145 KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1146 ("Provider's error should be set (error=%d)(mirror=%s).", 1147 bp->bio_to->error, bp->bio_to->name)); 1148 G_MIRROR_LOGREQ(3, bp, "Request received."); 1149 1150 switch (bp->bio_cmd) { 1151 case BIO_READ: 1152 case BIO_WRITE: 1153 case BIO_DELETE: 1154 break; 1155 case BIO_FLUSH: 1156 g_mirror_flush(sc, bp); 1157 return; 1158 case BIO_GETATTR: 1159 if (!strcmp(bp->bio_attribute, "GEOM::candelete")) { 1160 g_mirror_candelete(bp); 1161 return; 1162 } else if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) { 1163 g_mirror_kernel_dump(bp); 1164 return; 1165 } 1166 /* FALLTHROUGH */ 1167 default: 1168 g_io_deliver(bp, EOPNOTSUPP); 1169 return; 1170 } 1171 mtx_lock(&sc->sc_queue_mtx); 1172 bioq_insert_tail(&sc->sc_queue, bp); 1173 mtx_unlock(&sc->sc_queue_mtx); 1174 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 1175 wakeup(sc); 1176} 1177 1178/* 1179 * Return TRUE if the given request is colliding with a in-progress 1180 * synchronization request. 1181 */ 1182static int 1183g_mirror_sync_collision(struct g_mirror_softc *sc, struct bio *bp) 1184{ 1185 struct g_mirror_disk *disk; 1186 struct bio *sbp; 1187 off_t rstart, rend, sstart, send; 1188 u_int i; 1189 1190 if (sc->sc_sync.ds_ndisks == 0) 1191 return (0); 1192 rstart = bp->bio_offset; 1193 rend = bp->bio_offset + bp->bio_length; 1194 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1195 if (disk->d_state != G_MIRROR_DISK_STATE_SYNCHRONIZING) 1196 continue; 1197 for (i = 0; i < g_mirror_syncreqs; i++) { 1198 sbp = disk->d_sync.ds_bios[i]; 1199 if (sbp == NULL) 1200 continue; 1201 sstart = sbp->bio_offset; 1202 send = sbp->bio_offset + sbp->bio_length; 1203 if (rend > sstart && rstart < send) 1204 return (1); 1205 } 1206 } 1207 return (0); 1208} 1209 1210/* 1211 * Return TRUE if the given sync request is colliding with a in-progress regular 1212 * request. 1213 */ 1214static int 1215g_mirror_regular_collision(struct g_mirror_softc *sc, struct bio *sbp) 1216{ 1217 off_t rstart, rend, sstart, send; 1218 struct bio *bp; 1219 1220 if (sc->sc_sync.ds_ndisks == 0) 1221 return (0); 1222 sstart = sbp->bio_offset; 1223 send = sbp->bio_offset + sbp->bio_length; 1224 TAILQ_FOREACH(bp, &sc->sc_inflight.queue, bio_queue) { 1225 rstart = bp->bio_offset; 1226 rend = bp->bio_offset + bp->bio_length; 1227 if (rend > sstart && rstart < send) 1228 return (1); 1229 } 1230 return (0); 1231} 1232 1233/* 1234 * Puts request onto delayed queue. 1235 */ 1236static void 1237g_mirror_regular_delay(struct g_mirror_softc *sc, struct bio *bp) 1238{ 1239 1240 G_MIRROR_LOGREQ(2, bp, "Delaying request."); 1241 bioq_insert_head(&sc->sc_regular_delayed, bp); 1242} 1243 1244/* 1245 * Puts synchronization request onto delayed queue. 1246 */ 1247static void 1248g_mirror_sync_delay(struct g_mirror_softc *sc, struct bio *bp) 1249{ 1250 1251 G_MIRROR_LOGREQ(2, bp, "Delaying synchronization request."); 1252 bioq_insert_tail(&sc->sc_sync_delayed, bp); 1253} 1254 1255/* 1256 * Releases delayed regular requests which don't collide anymore with sync 1257 * requests. 1258 */ 1259static void 1260g_mirror_regular_release(struct g_mirror_softc *sc) 1261{ 1262 struct bio *bp, *bp2; 1263 1264 TAILQ_FOREACH_SAFE(bp, &sc->sc_regular_delayed.queue, bio_queue, bp2) { 1265 if (g_mirror_sync_collision(sc, bp)) 1266 continue; 1267 bioq_remove(&sc->sc_regular_delayed, bp); 1268 G_MIRROR_LOGREQ(2, bp, "Releasing delayed request (%p).", bp); 1269 mtx_lock(&sc->sc_queue_mtx); 1270 bioq_insert_head(&sc->sc_queue, bp); 1271#if 0 1272 /* 1273 * wakeup() is not needed, because this function is called from 1274 * the worker thread. 1275 */ 1276 wakeup(&sc->sc_queue); 1277#endif 1278 mtx_unlock(&sc->sc_queue_mtx); 1279 } 1280} 1281 1282/* 1283 * Releases delayed sync requests which don't collide anymore with regular 1284 * requests. 1285 */ 1286static void 1287g_mirror_sync_release(struct g_mirror_softc *sc) 1288{ 1289 struct bio *bp, *bp2; 1290 1291 TAILQ_FOREACH_SAFE(bp, &sc->sc_sync_delayed.queue, bio_queue, bp2) { 1292 if (g_mirror_regular_collision(sc, bp)) 1293 continue; 1294 bioq_remove(&sc->sc_sync_delayed, bp); 1295 G_MIRROR_LOGREQ(2, bp, 1296 "Releasing delayed synchronization request."); 1297 g_io_request(bp, bp->bio_from); 1298 } 1299} 1300 1301/* 1302 * Handle synchronization requests. 1303 * Every synchronization request is two-steps process: first, READ request is 1304 * send to active provider and then WRITE request (with read data) to the provider 1305 * beeing synchronized. When WRITE is finished, new synchronization request is 1306 * send. 1307 */ 1308static void 1309g_mirror_sync_request(struct bio *bp) 1310{ 1311 struct g_mirror_softc *sc; 1312 struct g_mirror_disk *disk; 1313 1314 bp->bio_from->index--; 1315 sc = bp->bio_from->geom->softc; 1316 disk = bp->bio_from->private; 1317 if (disk == NULL) { 1318 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 1319 g_topology_lock(); 1320 g_mirror_kill_consumer(sc, bp->bio_from); 1321 g_topology_unlock(); 1322 free(bp->bio_data, M_MIRROR); 1323 g_destroy_bio(bp); 1324 sx_xlock(&sc->sc_lock); 1325 return; 1326 } 1327 1328 /* 1329 * Synchronization request. 1330 */ 1331 switch (bp->bio_cmd) { 1332 case BIO_READ: 1333 { 1334 struct g_consumer *cp; 1335 1336 if (bp->bio_error != 0) { 1337 G_MIRROR_LOGREQ(0, bp, 1338 "Synchronization request failed (error=%d).", 1339 bp->bio_error); 1340 g_destroy_bio(bp); 1341 return; 1342 } 1343 G_MIRROR_LOGREQ(3, bp, 1344 "Synchronization request half-finished."); 1345 bp->bio_cmd = BIO_WRITE; 1346 bp->bio_cflags = 0; 1347 cp = disk->d_consumer; 1348 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1349 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1350 cp->acr, cp->acw, cp->ace)); 1351 cp->index++; 1352 g_io_request(bp, cp); 1353 return; 1354 } 1355 case BIO_WRITE: 1356 { 1357 struct g_mirror_disk_sync *sync; 1358 off_t offset; 1359 void *data; 1360 int i; 1361 1362 if (bp->bio_error != 0) { 1363 G_MIRROR_LOGREQ(0, bp, 1364 "Synchronization request failed (error=%d).", 1365 bp->bio_error); 1366 g_destroy_bio(bp); 1367 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 1368 g_mirror_event_send(disk, 1369 G_MIRROR_DISK_STATE_DISCONNECTED, 1370 G_MIRROR_EVENT_DONTWAIT); 1371 return; 1372 } 1373 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished."); 1374 sync = &disk->d_sync; 1375 if (sync->ds_offset >= sc->sc_mediasize || 1376 sync->ds_consumer == NULL || 1377 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1378 /* Don't send more synchronization requests. */ 1379 sync->ds_inflight--; 1380 if (sync->ds_bios != NULL) { 1381 i = (int)(uintptr_t)bp->bio_caller1; 1382 sync->ds_bios[i] = NULL; 1383 } 1384 free(bp->bio_data, M_MIRROR); 1385 g_destroy_bio(bp); 1386 if (sync->ds_inflight > 0) 1387 return; 1388 if (sync->ds_consumer == NULL || 1389 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1390 return; 1391 } 1392 /* Disk up-to-date, activate it. */ 1393 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE, 1394 G_MIRROR_EVENT_DONTWAIT); 1395 return; 1396 } 1397 1398 /* Send next synchronization request. */ 1399 data = bp->bio_data; 1400 bzero(bp, sizeof(*bp)); 1401 bp->bio_cmd = BIO_READ; 1402 bp->bio_offset = sync->ds_offset; 1403 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset); 1404 sync->ds_offset += bp->bio_length; 1405 bp->bio_done = g_mirror_sync_done; 1406 bp->bio_data = data; 1407 bp->bio_from = sync->ds_consumer; 1408 bp->bio_to = sc->sc_provider; 1409 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 1410 sync->ds_consumer->index++; 1411 /* 1412 * Delay the request if it is colliding with a regular request. 1413 */ 1414 if (g_mirror_regular_collision(sc, bp)) 1415 g_mirror_sync_delay(sc, bp); 1416 else 1417 g_io_request(bp, sync->ds_consumer); 1418 1419 /* Release delayed requests if possible. */ 1420 g_mirror_regular_release(sc); 1421 1422 /* Find the smallest offset */ 1423 offset = sc->sc_mediasize; 1424 for (i = 0; i < g_mirror_syncreqs; i++) { 1425 bp = sync->ds_bios[i]; 1426 if (bp->bio_offset < offset) 1427 offset = bp->bio_offset; 1428 } 1429 if (sync->ds_offset_done + (MAXPHYS * 100) < offset) { 1430 /* Update offset_done on every 100 blocks. */ 1431 sync->ds_offset_done = offset; 1432 g_mirror_update_metadata(disk); 1433 } 1434 return; 1435 } 1436 default: 1437 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1438 bp->bio_cmd, sc->sc_name)); 1439 break; 1440 } 1441} 1442 1443static void 1444g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp) 1445{ 1446 struct g_mirror_disk *disk; 1447 struct g_consumer *cp; 1448 struct bio *cbp; 1449 1450 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1451 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE) 1452 break; 1453 } 1454 if (disk == NULL) { 1455 if (bp->bio_error == 0) 1456 bp->bio_error = ENXIO; 1457 g_io_deliver(bp, bp->bio_error); 1458 return; 1459 } 1460 cbp = g_clone_bio(bp); 1461 if (cbp == NULL) { 1462 if (bp->bio_error == 0) 1463 bp->bio_error = ENOMEM; 1464 g_io_deliver(bp, bp->bio_error); 1465 return; 1466 } 1467 /* 1468 * Fill in the component buf structure. 1469 */ 1470 cp = disk->d_consumer; 1471 cbp->bio_done = g_mirror_done; 1472 cbp->bio_to = cp->provider; 1473 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1474 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1475 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1476 cp->acw, cp->ace)); 1477 cp->index++; 1478 g_io_request(cbp, cp); 1479} 1480 1481static void 1482g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp) 1483{ 1484 struct g_mirror_disk *disk; 1485 struct g_consumer *cp; 1486 struct bio *cbp; 1487 1488 disk = g_mirror_get_disk(sc); 1489 if (disk == NULL) { 1490 if (bp->bio_error == 0) 1491 bp->bio_error = ENXIO; 1492 g_io_deliver(bp, bp->bio_error); 1493 return; 1494 } 1495 cbp = g_clone_bio(bp); 1496 if (cbp == NULL) { 1497 if (bp->bio_error == 0) 1498 bp->bio_error = ENOMEM; 1499 g_io_deliver(bp, bp->bio_error); 1500 return; 1501 } 1502 /* 1503 * Fill in the component buf structure. 1504 */ 1505 cp = disk->d_consumer; 1506 cbp->bio_done = g_mirror_done; 1507 cbp->bio_to = cp->provider; 1508 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1509 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1510 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1511 cp->acw, cp->ace)); 1512 cp->index++; 1513 g_io_request(cbp, cp); 1514} 1515 1516#define TRACK_SIZE (1 * 1024 * 1024) 1517#define LOAD_SCALE 256 1518#define ABS(x) (((x) >= 0) ? (x) : (-(x))) 1519 1520static void 1521g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp) 1522{ 1523 struct g_mirror_disk *disk, *dp; 1524 struct g_consumer *cp; 1525 struct bio *cbp; 1526 int prio, best; 1527 1528 /* Find a disk with the smallest load. */ 1529 disk = NULL; 1530 best = INT_MAX; 1531 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1532 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1533 continue; 1534 prio = dp->load; 1535 /* If disk head is precisely in position - highly prefer it. */ 1536 if (dp->d_last_offset == bp->bio_offset) 1537 prio -= 2 * LOAD_SCALE; 1538 else 1539 /* If disk head is close to position - prefer it. */ 1540 if (ABS(dp->d_last_offset - bp->bio_offset) < TRACK_SIZE) 1541 prio -= 1 * LOAD_SCALE; 1542 if (prio <= best) { 1543 disk = dp; 1544 best = prio; 1545 } 1546 } 1547 KASSERT(disk != NULL, ("NULL disk for %s.", sc->sc_name)); 1548 cbp = g_clone_bio(bp); 1549 if (cbp == NULL) { 1550 if (bp->bio_error == 0) 1551 bp->bio_error = ENOMEM; 1552 g_io_deliver(bp, bp->bio_error); 1553 return; 1554 } 1555 /* 1556 * Fill in the component buf structure. 1557 */ 1558 cp = disk->d_consumer; 1559 cbp->bio_done = g_mirror_done; 1560 cbp->bio_to = cp->provider; 1561 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1562 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1563 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1564 cp->acw, cp->ace)); 1565 cp->index++; 1566 /* Remember last head position */ 1567 disk->d_last_offset = bp->bio_offset + bp->bio_length; 1568 /* Update loads. */ 1569 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1570 dp->load = (dp->d_consumer->index * LOAD_SCALE + 1571 dp->load * 7) / 8; 1572 } 1573 g_io_request(cbp, cp); 1574} 1575 1576static void 1577g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp) 1578{ 1579 struct bio_queue_head queue; 1580 struct g_mirror_disk *disk; 1581 struct g_consumer *cp; 1582 struct bio *cbp; 1583 off_t left, mod, offset, slice; 1584 u_char *data; 1585 u_int ndisks; 1586 1587 if (bp->bio_length <= sc->sc_slice) { 1588 g_mirror_request_round_robin(sc, bp); 1589 return; 1590 } 1591 ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE); 1592 slice = bp->bio_length / ndisks; 1593 mod = slice % sc->sc_provider->sectorsize; 1594 if (mod != 0) 1595 slice += sc->sc_provider->sectorsize - mod; 1596 /* 1597 * Allocate all bios before sending any request, so we can 1598 * return ENOMEM in nice and clean way. 1599 */ 1600 left = bp->bio_length; 1601 offset = bp->bio_offset; 1602 data = bp->bio_data; 1603 bioq_init(&queue); 1604 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1605 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1606 continue; 1607 cbp = g_clone_bio(bp); 1608 if (cbp == NULL) { 1609 while ((cbp = bioq_takefirst(&queue)) != NULL) 1610 g_destroy_bio(cbp); 1611 if (bp->bio_error == 0) 1612 bp->bio_error = ENOMEM; 1613 g_io_deliver(bp, bp->bio_error); 1614 return; 1615 } 1616 bioq_insert_tail(&queue, cbp); 1617 cbp->bio_done = g_mirror_done; 1618 cbp->bio_caller1 = disk; 1619 cbp->bio_to = disk->d_consumer->provider; 1620 cbp->bio_offset = offset; 1621 cbp->bio_data = data; 1622 cbp->bio_length = MIN(left, slice); 1623 left -= cbp->bio_length; 1624 if (left == 0) 1625 break; 1626 offset += cbp->bio_length; 1627 data += cbp->bio_length; 1628 } 1629 while ((cbp = bioq_takefirst(&queue)) != NULL) { 1630 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1631 disk = cbp->bio_caller1; 1632 cbp->bio_caller1 = NULL; 1633 cp = disk->d_consumer; 1634 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1635 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1636 cp->acr, cp->acw, cp->ace)); 1637 disk->d_consumer->index++; 1638 g_io_request(cbp, disk->d_consumer); 1639 } 1640} 1641 1642static void 1643g_mirror_register_request(struct bio *bp) 1644{ 1645 struct g_mirror_softc *sc; 1646 1647 sc = bp->bio_to->private; 1648 switch (bp->bio_cmd) { 1649 case BIO_READ: 1650 switch (sc->sc_balance) { 1651 case G_MIRROR_BALANCE_LOAD: 1652 g_mirror_request_load(sc, bp); 1653 break; 1654 case G_MIRROR_BALANCE_PREFER: 1655 g_mirror_request_prefer(sc, bp); 1656 break; 1657 case G_MIRROR_BALANCE_ROUND_ROBIN: 1658 g_mirror_request_round_robin(sc, bp); 1659 break; 1660 case G_MIRROR_BALANCE_SPLIT: 1661 g_mirror_request_split(sc, bp); 1662 break; 1663 } 1664 return; 1665 case BIO_WRITE: 1666 case BIO_DELETE: 1667 { 1668 struct g_mirror_disk *disk; 1669 struct g_mirror_disk_sync *sync; 1670 struct bio_queue_head queue; 1671 struct g_consumer *cp; 1672 struct bio *cbp; 1673 1674 /* 1675 * Delay the request if it is colliding with a synchronization 1676 * request. 1677 */ 1678 if (g_mirror_sync_collision(sc, bp)) { 1679 g_mirror_regular_delay(sc, bp); 1680 return; 1681 } 1682 1683 if (sc->sc_idle) 1684 g_mirror_unidle(sc); 1685 else 1686 sc->sc_last_write = time_uptime; 1687 1688 /* 1689 * Allocate all bios before sending any request, so we can 1690 * return ENOMEM in nice and clean way. 1691 */ 1692 bioq_init(&queue); 1693 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1694 sync = &disk->d_sync; 1695 switch (disk->d_state) { 1696 case G_MIRROR_DISK_STATE_ACTIVE: 1697 break; 1698 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 1699 if (bp->bio_offset >= sync->ds_offset) 1700 continue; 1701 break; 1702 default: 1703 continue; 1704 } 1705 if (bp->bio_cmd == BIO_DELETE && 1706 (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) == 0) 1707 continue; 1708 cbp = g_clone_bio(bp); 1709 if (cbp == NULL) { 1710 while ((cbp = bioq_takefirst(&queue)) != NULL) 1711 g_destroy_bio(cbp); 1712 if (bp->bio_error == 0) 1713 bp->bio_error = ENOMEM; 1714 g_io_deliver(bp, bp->bio_error); 1715 return; 1716 } 1717 bioq_insert_tail(&queue, cbp); 1718 cbp->bio_done = g_mirror_done; 1719 cp = disk->d_consumer; 1720 cbp->bio_caller1 = cp; 1721 cbp->bio_to = cp->provider; 1722 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1723 ("Consumer %s not opened (r%dw%de%d).", 1724 cp->provider->name, cp->acr, cp->acw, cp->ace)); 1725 } 1726 if (bioq_first(&queue) == NULL) { 1727 g_io_deliver(bp, EOPNOTSUPP); 1728 return; 1729 } 1730 while ((cbp = bioq_takefirst(&queue)) != NULL) { 1731 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1732 cp = cbp->bio_caller1; 1733 cbp->bio_caller1 = NULL; 1734 cp->index++; 1735 sc->sc_writes++; 1736 g_io_request(cbp, cp); 1737 } 1738 /* 1739 * Put request onto inflight queue, so we can check if new 1740 * synchronization requests don't collide with it. 1741 */ 1742 bioq_insert_tail(&sc->sc_inflight, bp); 1743 /* 1744 * Bump syncid on first write. 1745 */ 1746 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) { 1747 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 1748 g_mirror_bump_syncid(sc); 1749 } 1750 return; 1751 } 1752 default: 1753 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1754 bp->bio_cmd, sc->sc_name)); 1755 break; 1756 } 1757} 1758 1759static int 1760g_mirror_can_destroy(struct g_mirror_softc *sc) 1761{ 1762 struct g_geom *gp; 1763 struct g_consumer *cp; 1764 1765 g_topology_assert(); 1766 gp = sc->sc_geom; 1767 if (gp->softc == NULL) 1768 return (1); 1769 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_TASTING) != 0) 1770 return (0); 1771 LIST_FOREACH(cp, &gp->consumer, consumer) { 1772 if (g_mirror_is_busy(sc, cp)) 1773 return (0); 1774 } 1775 gp = sc->sc_sync.ds_geom; 1776 LIST_FOREACH(cp, &gp->consumer, consumer) { 1777 if (g_mirror_is_busy(sc, cp)) 1778 return (0); 1779 } 1780 G_MIRROR_DEBUG(2, "No I/O requests for %s, it can be destroyed.", 1781 sc->sc_name); 1782 return (1); 1783} 1784 1785static int 1786g_mirror_try_destroy(struct g_mirror_softc *sc) 1787{ 1788 1789 if (sc->sc_rootmount != NULL) { 1790 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 1791 sc->sc_rootmount); 1792 root_mount_rel(sc->sc_rootmount); 1793 sc->sc_rootmount = NULL; 1794 } 1795 g_topology_lock(); 1796 if (!g_mirror_can_destroy(sc)) { 1797 g_topology_unlock(); 1798 return (0); 1799 } 1800 sc->sc_geom->softc = NULL; 1801 sc->sc_sync.ds_geom->softc = NULL; 1802 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WAIT) != 0) { 1803 g_topology_unlock(); 1804 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1805 &sc->sc_worker); 1806 /* Unlock sc_lock here, as it can be destroyed after wakeup. */ 1807 sx_xunlock(&sc->sc_lock); 1808 wakeup(&sc->sc_worker); 1809 sc->sc_worker = NULL; 1810 } else { 1811 g_topology_unlock(); 1812 g_mirror_destroy_device(sc); 1813 } 1814 return (1); 1815} 1816 1817/* 1818 * Worker thread. 1819 */ 1820static void 1821g_mirror_worker(void *arg) 1822{ 1823 struct g_mirror_softc *sc; 1824 struct g_mirror_event *ep; 1825 struct bio *bp; 1826 int timeout; 1827 1828 sc = arg; 1829 thread_lock(curthread); 1830 sched_prio(curthread, PRIBIO); 1831 thread_unlock(curthread); 1832 1833 sx_xlock(&sc->sc_lock); 1834 for (;;) { 1835 G_MIRROR_DEBUG(5, "%s: Let's see...", __func__); 1836 /* 1837 * First take a look at events. 1838 * This is important to handle events before any I/O requests. 1839 */ 1840 ep = g_mirror_event_get(sc); 1841 if (ep != NULL) { 1842 g_mirror_event_remove(sc, ep); 1843 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) { 1844 /* Update only device status. */ 1845 G_MIRROR_DEBUG(3, 1846 "Running event for device %s.", 1847 sc->sc_name); 1848 ep->e_error = 0; 1849 g_mirror_update_device(sc, 1); 1850 } else { 1851 /* Update disk status. */ 1852 G_MIRROR_DEBUG(3, "Running event for disk %s.", 1853 g_mirror_get_diskname(ep->e_disk)); 1854 ep->e_error = g_mirror_update_disk(ep->e_disk, 1855 ep->e_state); 1856 if (ep->e_error == 0) 1857 g_mirror_update_device(sc, 0); 1858 } 1859 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) { 1860 KASSERT(ep->e_error == 0, 1861 ("Error cannot be handled.")); 1862 g_mirror_event_free(ep); 1863 } else { 1864 ep->e_flags |= G_MIRROR_EVENT_DONE; 1865 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1866 ep); 1867 mtx_lock(&sc->sc_events_mtx); 1868 wakeup(ep); 1869 mtx_unlock(&sc->sc_events_mtx); 1870 } 1871 if ((sc->sc_flags & 1872 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1873 if (g_mirror_try_destroy(sc)) { 1874 curthread->td_pflags &= ~TDP_GEOM; 1875 G_MIRROR_DEBUG(1, "Thread exiting."); 1876 kproc_exit(0); 1877 } 1878 } 1879 G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__); 1880 continue; 1881 } 1882 /* 1883 * Check if we can mark array as CLEAN and if we can't take 1884 * how much seconds should we wait. 1885 */ 1886 timeout = g_mirror_idle(sc, -1); 1887 /* 1888 * Now I/O requests. 1889 */ 1890 /* Get first request from the queue. */ 1891 mtx_lock(&sc->sc_queue_mtx); 1892 bp = bioq_takefirst(&sc->sc_queue); 1893 if (bp == NULL) { 1894 if ((sc->sc_flags & 1895 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1896 mtx_unlock(&sc->sc_queue_mtx); 1897 if (g_mirror_try_destroy(sc)) { 1898 curthread->td_pflags &= ~TDP_GEOM; 1899 G_MIRROR_DEBUG(1, "Thread exiting."); 1900 kproc_exit(0); 1901 } 1902 mtx_lock(&sc->sc_queue_mtx); 1903 } 1904 sx_xunlock(&sc->sc_lock); 1905 /* 1906 * XXX: We can miss an event here, because an event 1907 * can be added without sx-device-lock and without 1908 * mtx-queue-lock. Maybe I should just stop using 1909 * dedicated mutex for events synchronization and 1910 * stick with the queue lock? 1911 * The event will hang here until next I/O request 1912 * or next event is received. 1913 */ 1914 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w1", 1915 timeout * hz); 1916 sx_xlock(&sc->sc_lock); 1917 G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__); 1918 continue; 1919 } 1920 mtx_unlock(&sc->sc_queue_mtx); 1921 1922 if (bp->bio_from->geom == sc->sc_sync.ds_geom && 1923 (bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) { 1924 g_mirror_sync_request(bp); /* READ */ 1925 } else if (bp->bio_to != sc->sc_provider) { 1926 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0) 1927 g_mirror_regular_request(bp); 1928 else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 1929 g_mirror_sync_request(bp); /* WRITE */ 1930 else { 1931 KASSERT(0, 1932 ("Invalid request cflags=0x%hhx to=%s.", 1933 bp->bio_cflags, bp->bio_to->name)); 1934 } 1935 } else { 1936 g_mirror_register_request(bp); 1937 } 1938 G_MIRROR_DEBUG(5, "%s: I'm here 9.", __func__); 1939 } 1940} 1941 1942static void 1943g_mirror_update_idle(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 1944{ 1945 1946 sx_assert(&sc->sc_lock, SX_LOCKED); 1947 1948 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 1949 return; 1950 if (!sc->sc_idle && (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) { 1951 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.", 1952 g_mirror_get_diskname(disk), sc->sc_name); 1953 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1954 } else if (sc->sc_idle && 1955 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 1956 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.", 1957 g_mirror_get_diskname(disk), sc->sc_name); 1958 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 1959 } 1960} 1961 1962static void 1963g_mirror_sync_start(struct g_mirror_disk *disk) 1964{ 1965 struct g_mirror_softc *sc; 1966 struct g_consumer *cp; 1967 struct bio *bp; 1968 int error, i; 1969 1970 g_topology_assert_not(); 1971 sc = disk->d_softc; 1972 sx_assert(&sc->sc_lock, SX_LOCKED); 1973 1974 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 1975 ("Disk %s is not marked for synchronization.", 1976 g_mirror_get_diskname(disk))); 1977 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1978 ("Device not in RUNNING state (%s, %u).", sc->sc_name, 1979 sc->sc_state)); 1980 1981 sx_xunlock(&sc->sc_lock); 1982 g_topology_lock(); 1983 cp = g_new_consumer(sc->sc_sync.ds_geom); 1984 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 1985 error = g_attach(cp, sc->sc_provider); 1986 KASSERT(error == 0, 1987 ("Cannot attach to %s (error=%d).", sc->sc_name, error)); 1988 error = g_access(cp, 1, 0, 0); 1989 KASSERT(error == 0, ("Cannot open %s (error=%d).", sc->sc_name, error)); 1990 g_topology_unlock(); 1991 sx_xlock(&sc->sc_lock); 1992 1993 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name, 1994 g_mirror_get_diskname(disk)); 1995 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) == 0) 1996 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1997 KASSERT(disk->d_sync.ds_consumer == NULL, 1998 ("Sync consumer already exists (device=%s, disk=%s).", 1999 sc->sc_name, g_mirror_get_diskname(disk))); 2000 2001 disk->d_sync.ds_consumer = cp; 2002 disk->d_sync.ds_consumer->private = disk; 2003 disk->d_sync.ds_consumer->index = 0; 2004 2005 /* 2006 * Allocate memory for synchronization bios and initialize them. 2007 */ 2008 disk->d_sync.ds_bios = malloc(sizeof(struct bio *) * g_mirror_syncreqs, 2009 M_MIRROR, M_WAITOK); 2010 for (i = 0; i < g_mirror_syncreqs; i++) { 2011 bp = g_alloc_bio(); 2012 disk->d_sync.ds_bios[i] = bp; 2013 bp->bio_parent = NULL; 2014 bp->bio_cmd = BIO_READ; 2015 bp->bio_data = malloc(MAXPHYS, M_MIRROR, M_WAITOK); 2016 bp->bio_cflags = 0; 2017 bp->bio_offset = disk->d_sync.ds_offset; 2018 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset); 2019 disk->d_sync.ds_offset += bp->bio_length; 2020 bp->bio_done = g_mirror_sync_done; 2021 bp->bio_from = disk->d_sync.ds_consumer; 2022 bp->bio_to = sc->sc_provider; 2023 bp->bio_caller1 = (void *)(uintptr_t)i; 2024 } 2025 2026 /* Increase the number of disks in SYNCHRONIZING state. */ 2027 sc->sc_sync.ds_ndisks++; 2028 /* Set the number of in-flight synchronization requests. */ 2029 disk->d_sync.ds_inflight = g_mirror_syncreqs; 2030 2031 /* 2032 * Fire off first synchronization requests. 2033 */ 2034 for (i = 0; i < g_mirror_syncreqs; i++) { 2035 bp = disk->d_sync.ds_bios[i]; 2036 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 2037 disk->d_sync.ds_consumer->index++; 2038 /* 2039 * Delay the request if it is colliding with a regular request. 2040 */ 2041 if (g_mirror_regular_collision(sc, bp)) 2042 g_mirror_sync_delay(sc, bp); 2043 else 2044 g_io_request(bp, disk->d_sync.ds_consumer); 2045 } 2046} 2047 2048/* 2049 * Stop synchronization process. 2050 * type: 0 - synchronization finished 2051 * 1 - synchronization stopped 2052 */ 2053static void 2054g_mirror_sync_stop(struct g_mirror_disk *disk, int type) 2055{ 2056 struct g_mirror_softc *sc; 2057 struct g_consumer *cp; 2058 2059 g_topology_assert_not(); 2060 sc = disk->d_softc; 2061 sx_assert(&sc->sc_lock, SX_LOCKED); 2062 2063 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2064 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2065 g_mirror_disk_state2str(disk->d_state))); 2066 if (disk->d_sync.ds_consumer == NULL) 2067 return; 2068 2069 if (type == 0) { 2070 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.", 2071 sc->sc_name, g_mirror_get_diskname(disk)); 2072 } else /* if (type == 1) */ { 2073 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.", 2074 sc->sc_name, g_mirror_get_diskname(disk)); 2075 } 2076 free(disk->d_sync.ds_bios, M_MIRROR); 2077 disk->d_sync.ds_bios = NULL; 2078 cp = disk->d_sync.ds_consumer; 2079 disk->d_sync.ds_consumer = NULL; 2080 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2081 sc->sc_sync.ds_ndisks--; 2082 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 2083 g_topology_lock(); 2084 g_mirror_kill_consumer(sc, cp); 2085 g_topology_unlock(); 2086 sx_xlock(&sc->sc_lock); 2087} 2088 2089static void 2090g_mirror_launch_provider(struct g_mirror_softc *sc) 2091{ 2092 struct g_mirror_disk *disk; 2093 struct g_provider *pp, *dp; 2094 2095 sx_assert(&sc->sc_lock, SX_LOCKED); 2096 2097 g_topology_lock(); 2098 pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name); 2099 pp->flags |= G_PF_DIRECT_RECEIVE; 2100 pp->mediasize = sc->sc_mediasize; 2101 pp->sectorsize = sc->sc_sectorsize; 2102 pp->stripesize = 0; 2103 pp->stripeoffset = 0; 2104 2105 /* Splitting of unmapped BIO's could work but isn't implemented now */ 2106 if (sc->sc_balance != G_MIRROR_BALANCE_SPLIT) 2107 pp->flags |= G_PF_ACCEPT_UNMAPPED; 2108 2109 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2110 if (disk->d_consumer && disk->d_consumer->provider) { 2111 dp = disk->d_consumer->provider; 2112 if (dp->stripesize > pp->stripesize) { 2113 pp->stripesize = dp->stripesize; 2114 pp->stripeoffset = dp->stripeoffset; 2115 } 2116 /* A provider underneath us doesn't support unmapped */ 2117 if ((dp->flags & G_PF_ACCEPT_UNMAPPED) == 0) { 2118 G_MIRROR_DEBUG(0, "Cancelling unmapped " 2119 "because of %s.", dp->name); 2120 pp->flags &= ~G_PF_ACCEPT_UNMAPPED; 2121 } 2122 } 2123 } 2124 pp->private = sc; 2125 sc->sc_refcnt++; 2126 sc->sc_provider = pp; 2127 g_error_provider(pp, 0); 2128 g_topology_unlock(); 2129 G_MIRROR_DEBUG(0, "Device %s launched (%u/%u).", pp->name, 2130 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE), sc->sc_ndisks); 2131 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2132 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2133 g_mirror_sync_start(disk); 2134 } 2135} 2136 2137static void 2138g_mirror_destroy_provider(struct g_mirror_softc *sc) 2139{ 2140 struct g_mirror_disk *disk; 2141 struct bio *bp; 2142 2143 g_topology_assert_not(); 2144 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).", 2145 sc->sc_name)); 2146 2147 g_topology_lock(); 2148 g_error_provider(sc->sc_provider, ENXIO); 2149 mtx_lock(&sc->sc_queue_mtx); 2150 while ((bp = bioq_takefirst(&sc->sc_queue)) != NULL) { 2151 /* 2152 * Abort any pending I/O that wasn't generated by us. 2153 * Synchronization requests and requests destined for individual 2154 * mirror components can be destroyed immediately. 2155 */ 2156 if (bp->bio_to == sc->sc_provider && 2157 bp->bio_from->geom != sc->sc_sync.ds_geom) { 2158 g_io_deliver(bp, ENXIO); 2159 } else { 2160 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 2161 free(bp->bio_data, M_MIRROR); 2162 g_destroy_bio(bp); 2163 } 2164 } 2165 mtx_unlock(&sc->sc_queue_mtx); 2166 g_wither_provider(sc->sc_provider, ENXIO); 2167 sc->sc_provider = NULL; 2168 G_MIRROR_DEBUG(0, "Device %s: provider destroyed.", sc->sc_name); 2169 g_topology_unlock(); 2170 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2171 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2172 g_mirror_sync_stop(disk, 1); 2173 } 2174} 2175 2176static void 2177g_mirror_go(void *arg) 2178{ 2179 struct g_mirror_softc *sc; 2180 2181 sc = arg; 2182 G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name); 2183 g_mirror_event_send(sc, 0, 2184 G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE); 2185} 2186 2187static u_int 2188g_mirror_determine_state(struct g_mirror_disk *disk) 2189{ 2190 struct g_mirror_softc *sc; 2191 u_int state; 2192 2193 sc = disk->d_softc; 2194 if (sc->sc_syncid == disk->d_sync.ds_syncid) { 2195 if ((disk->d_flags & 2196 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2197 /* Disk does not need synchronization. */ 2198 state = G_MIRROR_DISK_STATE_ACTIVE; 2199 } else { 2200 if ((sc->sc_flags & 2201 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2202 (disk->d_flags & 2203 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2204 /* 2205 * We can start synchronization from 2206 * the stored offset. 2207 */ 2208 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2209 } else { 2210 state = G_MIRROR_DISK_STATE_STALE; 2211 } 2212 } 2213 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) { 2214 /* 2215 * Reset all synchronization data for this disk, 2216 * because if it even was synchronized, it was 2217 * synchronized to disks with different syncid. 2218 */ 2219 disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2220 disk->d_sync.ds_offset = 0; 2221 disk->d_sync.ds_offset_done = 0; 2222 disk->d_sync.ds_syncid = sc->sc_syncid; 2223 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2224 (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2225 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2226 } else { 2227 state = G_MIRROR_DISK_STATE_STALE; 2228 } 2229 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ { 2230 /* 2231 * Not good, NOT GOOD! 2232 * It means that mirror was started on stale disks 2233 * and more fresh disk just arrive. 2234 * If there were writes, mirror is broken, sorry. 2235 * I think the best choice here is don't touch 2236 * this disk and inform the user loudly. 2237 */ 2238 G_MIRROR_DEBUG(0, "Device %s was started before the freshest " 2239 "disk (%s) arrives!! It will not be connected to the " 2240 "running device.", sc->sc_name, 2241 g_mirror_get_diskname(disk)); 2242 g_mirror_destroy_disk(disk); 2243 state = G_MIRROR_DISK_STATE_NONE; 2244 /* Return immediately, because disk was destroyed. */ 2245 return (state); 2246 } 2247 G_MIRROR_DEBUG(3, "State for %s disk: %s.", 2248 g_mirror_get_diskname(disk), g_mirror_disk_state2str(state)); 2249 return (state); 2250} 2251 2252/* 2253 * Update device state. 2254 */ 2255static void 2256g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force) 2257{ 2258 struct g_mirror_disk *disk; 2259 u_int state; 2260 2261 sx_assert(&sc->sc_lock, SX_XLOCKED); 2262 2263 switch (sc->sc_state) { 2264 case G_MIRROR_DEVICE_STATE_STARTING: 2265 { 2266 struct g_mirror_disk *pdisk, *tdisk; 2267 u_int dirty, ndisks, genid, syncid; 2268 2269 KASSERT(sc->sc_provider == NULL, 2270 ("Non-NULL provider in STARTING state (%s).", sc->sc_name)); 2271 /* 2272 * Are we ready? We are, if all disks are connected or 2273 * if we have any disks and 'force' is true. 2274 */ 2275 ndisks = g_mirror_ndisks(sc, -1); 2276 if (sc->sc_ndisks == ndisks || (force && ndisks > 0)) { 2277 ; 2278 } else if (ndisks == 0) { 2279 /* 2280 * Disks went down in starting phase, so destroy 2281 * device. 2282 */ 2283 callout_drain(&sc->sc_callout); 2284 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2285 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 2286 sc->sc_rootmount); 2287 root_mount_rel(sc->sc_rootmount); 2288 sc->sc_rootmount = NULL; 2289 return; 2290 } else { 2291 return; 2292 } 2293 2294 /* 2295 * Activate all disks with the biggest syncid. 2296 */ 2297 if (force) { 2298 /* 2299 * If 'force' is true, we have been called due to 2300 * timeout, so don't bother canceling timeout. 2301 */ 2302 ndisks = 0; 2303 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2304 if ((disk->d_flags & 2305 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2306 ndisks++; 2307 } 2308 } 2309 if (ndisks == 0) { 2310 /* No valid disks found, destroy device. */ 2311 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2312 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2313 __LINE__, sc->sc_rootmount); 2314 root_mount_rel(sc->sc_rootmount); 2315 sc->sc_rootmount = NULL; 2316 return; 2317 } 2318 } else { 2319 /* Cancel timeout. */ 2320 callout_drain(&sc->sc_callout); 2321 } 2322 2323 /* 2324 * Find the biggest genid. 2325 */ 2326 genid = 0; 2327 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2328 if (disk->d_genid > genid) 2329 genid = disk->d_genid; 2330 } 2331 sc->sc_genid = genid; 2332 /* 2333 * Remove all disks without the biggest genid. 2334 */ 2335 LIST_FOREACH_SAFE(disk, &sc->sc_disks, d_next, tdisk) { 2336 if (disk->d_genid < genid) { 2337 G_MIRROR_DEBUG(0, 2338 "Component %s (device %s) broken, skipping.", 2339 g_mirror_get_diskname(disk), sc->sc_name); 2340 g_mirror_destroy_disk(disk); 2341 } 2342 } 2343 2344 /* 2345 * Find the biggest syncid. 2346 */ 2347 syncid = 0; 2348 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2349 if (disk->d_sync.ds_syncid > syncid) 2350 syncid = disk->d_sync.ds_syncid; 2351 } 2352 2353 /* 2354 * Here we need to look for dirty disks and if all disks 2355 * with the biggest syncid are dirty, we have to choose 2356 * one with the biggest priority and rebuild the rest. 2357 */ 2358 /* 2359 * Find the number of dirty disks with the biggest syncid. 2360 * Find the number of disks with the biggest syncid. 2361 * While here, find a disk with the biggest priority. 2362 */ 2363 dirty = ndisks = 0; 2364 pdisk = NULL; 2365 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2366 if (disk->d_sync.ds_syncid != syncid) 2367 continue; 2368 if ((disk->d_flags & 2369 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2370 continue; 2371 } 2372 ndisks++; 2373 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 2374 dirty++; 2375 if (pdisk == NULL || 2376 pdisk->d_priority < disk->d_priority) { 2377 pdisk = disk; 2378 } 2379 } 2380 } 2381 if (dirty == 0) { 2382 /* No dirty disks at all, great. */ 2383 } else if (dirty == ndisks) { 2384 /* 2385 * Force synchronization for all dirty disks except one 2386 * with the biggest priority. 2387 */ 2388 KASSERT(pdisk != NULL, ("pdisk == NULL")); 2389 G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a " 2390 "master disk for synchronization.", 2391 g_mirror_get_diskname(pdisk), sc->sc_name); 2392 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2393 if (disk->d_sync.ds_syncid != syncid) 2394 continue; 2395 if ((disk->d_flags & 2396 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2397 continue; 2398 } 2399 KASSERT((disk->d_flags & 2400 G_MIRROR_DISK_FLAG_DIRTY) != 0, 2401 ("Disk %s isn't marked as dirty.", 2402 g_mirror_get_diskname(disk))); 2403 /* Skip the disk with the biggest priority. */ 2404 if (disk == pdisk) 2405 continue; 2406 disk->d_sync.ds_syncid = 0; 2407 } 2408 } else if (dirty < ndisks) { 2409 /* 2410 * Force synchronization for all dirty disks. 2411 * We have some non-dirty disks. 2412 */ 2413 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2414 if (disk->d_sync.ds_syncid != syncid) 2415 continue; 2416 if ((disk->d_flags & 2417 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2418 continue; 2419 } 2420 if ((disk->d_flags & 2421 G_MIRROR_DISK_FLAG_DIRTY) == 0) { 2422 continue; 2423 } 2424 disk->d_sync.ds_syncid = 0; 2425 } 2426 } 2427 2428 /* Reset hint. */ 2429 sc->sc_hint = NULL; 2430 sc->sc_syncid = syncid; 2431 if (force) { 2432 /* Remember to bump syncid on first write. */ 2433 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2434 } 2435 state = G_MIRROR_DEVICE_STATE_RUNNING; 2436 G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.", 2437 sc->sc_name, g_mirror_device_state2str(sc->sc_state), 2438 g_mirror_device_state2str(state)); 2439 sc->sc_state = state; 2440 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2441 state = g_mirror_determine_state(disk); 2442 g_mirror_event_send(disk, state, 2443 G_MIRROR_EVENT_DONTWAIT); 2444 if (state == G_MIRROR_DISK_STATE_STALE) 2445 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2446 } 2447 break; 2448 } 2449 case G_MIRROR_DEVICE_STATE_RUNNING: 2450 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 && 2451 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2452 /* 2453 * No active disks or no disks at all, 2454 * so destroy device. 2455 */ 2456 if (sc->sc_provider != NULL) 2457 g_mirror_destroy_provider(sc); 2458 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2459 break; 2460 } else if (g_mirror_ndisks(sc, 2461 G_MIRROR_DISK_STATE_ACTIVE) > 0 && 2462 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2463 /* 2464 * We have active disks, launch provider if it doesn't 2465 * exist. 2466 */ 2467 if (sc->sc_provider == NULL) 2468 g_mirror_launch_provider(sc); 2469 if (sc->sc_rootmount != NULL) { 2470 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2471 __LINE__, sc->sc_rootmount); 2472 root_mount_rel(sc->sc_rootmount); 2473 sc->sc_rootmount = NULL; 2474 } 2475 } 2476 /* 2477 * Genid should be bumped immediately, so do it here. 2478 */ 2479 if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID) != 0) { 2480 sc->sc_bump_id &= ~G_MIRROR_BUMP_GENID; 2481 g_mirror_bump_genid(sc); 2482 } 2483 break; 2484 default: 2485 KASSERT(1 == 0, ("Wrong device state (%s, %s).", 2486 sc->sc_name, g_mirror_device_state2str(sc->sc_state))); 2487 break; 2488 } 2489} 2490 2491/* 2492 * Update disk state and device state if needed. 2493 */ 2494#define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \ 2495 "Disk %s state changed from %s to %s (device %s).", \ 2496 g_mirror_get_diskname(disk), \ 2497 g_mirror_disk_state2str(disk->d_state), \ 2498 g_mirror_disk_state2str(state), sc->sc_name) 2499static int 2500g_mirror_update_disk(struct g_mirror_disk *disk, u_int state) 2501{ 2502 struct g_mirror_softc *sc; 2503 2504 sc = disk->d_softc; 2505 sx_assert(&sc->sc_lock, SX_XLOCKED); 2506 2507again: 2508 G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.", 2509 g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state), 2510 g_mirror_disk_state2str(state)); 2511 switch (state) { 2512 case G_MIRROR_DISK_STATE_NEW: 2513 /* 2514 * Possible scenarios: 2515 * 1. New disk arrive. 2516 */ 2517 /* Previous state should be NONE. */ 2518 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE, 2519 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2520 g_mirror_disk_state2str(disk->d_state))); 2521 DISK_STATE_CHANGED(); 2522 2523 disk->d_state = state; 2524 if (LIST_EMPTY(&sc->sc_disks)) 2525 LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next); 2526 else { 2527 struct g_mirror_disk *dp; 2528 2529 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 2530 if (disk->d_priority >= dp->d_priority) { 2531 LIST_INSERT_BEFORE(dp, disk, d_next); 2532 dp = NULL; 2533 break; 2534 } 2535 if (LIST_NEXT(dp, d_next) == NULL) 2536 break; 2537 } 2538 if (dp != NULL) 2539 LIST_INSERT_AFTER(dp, disk, d_next); 2540 } 2541 G_MIRROR_DEBUG(1, "Device %s: provider %s detected.", 2542 sc->sc_name, g_mirror_get_diskname(disk)); 2543 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 2544 break; 2545 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2546 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2547 g_mirror_device_state2str(sc->sc_state), 2548 g_mirror_get_diskname(disk), 2549 g_mirror_disk_state2str(disk->d_state))); 2550 state = g_mirror_determine_state(disk); 2551 if (state != G_MIRROR_DISK_STATE_NONE) 2552 goto again; 2553 break; 2554 case G_MIRROR_DISK_STATE_ACTIVE: 2555 /* 2556 * Possible scenarios: 2557 * 1. New disk does not need synchronization. 2558 * 2. Synchronization process finished successfully. 2559 */ 2560 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2561 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2562 g_mirror_device_state2str(sc->sc_state), 2563 g_mirror_get_diskname(disk), 2564 g_mirror_disk_state2str(disk->d_state))); 2565 /* Previous state should be NEW or SYNCHRONIZING. */ 2566 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW || 2567 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2568 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2569 g_mirror_disk_state2str(disk->d_state))); 2570 DISK_STATE_CHANGED(); 2571 2572 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2573 disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2574 disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC; 2575 g_mirror_sync_stop(disk, 0); 2576 } 2577 disk->d_state = state; 2578 disk->d_sync.ds_offset = 0; 2579 disk->d_sync.ds_offset_done = 0; 2580 g_mirror_update_idle(sc, disk); 2581 g_mirror_update_metadata(disk); 2582 G_MIRROR_DEBUG(1, "Device %s: provider %s activated.", 2583 sc->sc_name, g_mirror_get_diskname(disk)); 2584 break; 2585 case G_MIRROR_DISK_STATE_STALE: 2586 /* 2587 * Possible scenarios: 2588 * 1. Stale disk was connected. 2589 */ 2590 /* Previous state should be NEW. */ 2591 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2592 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2593 g_mirror_disk_state2str(disk->d_state))); 2594 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2595 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2596 g_mirror_device_state2str(sc->sc_state), 2597 g_mirror_get_diskname(disk), 2598 g_mirror_disk_state2str(disk->d_state))); 2599 /* 2600 * STALE state is only possible if device is marked 2601 * NOAUTOSYNC. 2602 */ 2603 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0, 2604 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2605 g_mirror_device_state2str(sc->sc_state), 2606 g_mirror_get_diskname(disk), 2607 g_mirror_disk_state2str(disk->d_state))); 2608 DISK_STATE_CHANGED(); 2609 2610 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2611 disk->d_state = state; 2612 g_mirror_update_metadata(disk); 2613 G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.", 2614 sc->sc_name, g_mirror_get_diskname(disk)); 2615 break; 2616 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 2617 /* 2618 * Possible scenarios: 2619 * 1. Disk which needs synchronization was connected. 2620 */ 2621 /* Previous state should be NEW. */ 2622 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2623 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2624 g_mirror_disk_state2str(disk->d_state))); 2625 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2626 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2627 g_mirror_device_state2str(sc->sc_state), 2628 g_mirror_get_diskname(disk), 2629 g_mirror_disk_state2str(disk->d_state))); 2630 DISK_STATE_CHANGED(); 2631 2632 if (disk->d_state == G_MIRROR_DISK_STATE_NEW) 2633 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2634 disk->d_state = state; 2635 if (sc->sc_provider != NULL) { 2636 g_mirror_sync_start(disk); 2637 g_mirror_update_metadata(disk); 2638 } 2639 break; 2640 case G_MIRROR_DISK_STATE_DISCONNECTED: 2641 /* 2642 * Possible scenarios: 2643 * 1. Device wasn't running yet, but disk disappear. 2644 * 2. Disk was active and disapppear. 2645 * 3. Disk disappear during synchronization process. 2646 */ 2647 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) { 2648 /* 2649 * Previous state should be ACTIVE, STALE or 2650 * SYNCHRONIZING. 2651 */ 2652 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 2653 disk->d_state == G_MIRROR_DISK_STATE_STALE || 2654 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2655 ("Wrong disk state (%s, %s).", 2656 g_mirror_get_diskname(disk), 2657 g_mirror_disk_state2str(disk->d_state))); 2658 } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) { 2659 /* Previous state should be NEW. */ 2660 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2661 ("Wrong disk state (%s, %s).", 2662 g_mirror_get_diskname(disk), 2663 g_mirror_disk_state2str(disk->d_state))); 2664 /* 2665 * Reset bumping syncid if disk disappeared in STARTING 2666 * state. 2667 */ 2668 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) 2669 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 2670#ifdef INVARIANTS 2671 } else { 2672 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).", 2673 sc->sc_name, 2674 g_mirror_device_state2str(sc->sc_state), 2675 g_mirror_get_diskname(disk), 2676 g_mirror_disk_state2str(disk->d_state))); 2677#endif 2678 } 2679 DISK_STATE_CHANGED(); 2680 G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.", 2681 sc->sc_name, g_mirror_get_diskname(disk)); 2682 2683 g_mirror_destroy_disk(disk); 2684 break; 2685 case G_MIRROR_DISK_STATE_DESTROY: 2686 { 2687 int error; 2688 2689 error = g_mirror_clear_metadata(disk); 2690 if (error != 0) { 2691 G_MIRROR_DEBUG(0, 2692 "Device %s: failed to clear metadata on %s: %d.", 2693 sc->sc_name, g_mirror_get_diskname(disk), error); 2694 break; 2695 } 2696 DISK_STATE_CHANGED(); 2697 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", 2698 sc->sc_name, g_mirror_get_diskname(disk)); 2699 2700 g_mirror_destroy_disk(disk); 2701 sc->sc_ndisks--; 2702 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2703 g_mirror_update_metadata(disk); 2704 } 2705 break; 2706 } 2707 default: 2708 KASSERT(1 == 0, ("Unknown state (%u).", state)); 2709 break; 2710 } 2711 return (0); 2712} 2713#undef DISK_STATE_CHANGED 2714 2715int 2716g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md) 2717{ 2718 struct g_provider *pp; 2719 u_char *buf; 2720 int error; 2721 2722 g_topology_assert(); 2723 2724 error = g_access(cp, 1, 0, 0); 2725 if (error != 0) 2726 return (error); 2727 pp = cp->provider; 2728 g_topology_unlock(); 2729 /* Metadata are stored on last sector. */ 2730 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 2731 &error); 2732 g_topology_lock(); 2733 g_access(cp, -1, 0, 0); 2734 if (buf == NULL) { 2735 G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).", 2736 cp->provider->name, error); 2737 return (error); 2738 } 2739 2740 /* Decode metadata. */ 2741 error = mirror_metadata_decode(buf, md); 2742 g_free(buf); 2743 if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0) 2744 return (EINVAL); 2745 if (md->md_version > G_MIRROR_VERSION) { 2746 G_MIRROR_DEBUG(0, 2747 "Kernel module is too old to handle metadata from %s.", 2748 cp->provider->name); 2749 return (EINVAL); 2750 } 2751 if (error != 0) { 2752 G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.", 2753 cp->provider->name); 2754 return (error); 2755 } 2756 2757 return (0); 2758} 2759 2760static int 2761g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp, 2762 struct g_mirror_metadata *md) 2763{ 2764 2765 if (g_mirror_id2disk(sc, md->md_did) != NULL) { 2766 G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.", 2767 pp->name, md->md_did); 2768 return (EEXIST); 2769 } 2770 if (md->md_all != sc->sc_ndisks) { 2771 G_MIRROR_DEBUG(1, 2772 "Invalid '%s' field on disk %s (device %s), skipping.", 2773 "md_all", pp->name, sc->sc_name); 2774 return (EINVAL); 2775 } 2776 if (md->md_slice != sc->sc_slice) { 2777 G_MIRROR_DEBUG(1, 2778 "Invalid '%s' field on disk %s (device %s), skipping.", 2779 "md_slice", pp->name, sc->sc_name); 2780 return (EINVAL); 2781 } 2782 if (md->md_balance != sc->sc_balance) { 2783 G_MIRROR_DEBUG(1, 2784 "Invalid '%s' field on disk %s (device %s), skipping.", 2785 "md_balance", pp->name, sc->sc_name); 2786 return (EINVAL); 2787 } 2788#if 0 2789 if (md->md_mediasize != sc->sc_mediasize) { 2790 G_MIRROR_DEBUG(1, 2791 "Invalid '%s' field on disk %s (device %s), skipping.", 2792 "md_mediasize", pp->name, sc->sc_name); 2793 return (EINVAL); 2794 } 2795#endif 2796 if (sc->sc_mediasize > pp->mediasize) { 2797 G_MIRROR_DEBUG(1, 2798 "Invalid size of disk %s (device %s), skipping.", pp->name, 2799 sc->sc_name); 2800 return (EINVAL); 2801 } 2802 if (md->md_sectorsize != sc->sc_sectorsize) { 2803 G_MIRROR_DEBUG(1, 2804 "Invalid '%s' field on disk %s (device %s), skipping.", 2805 "md_sectorsize", pp->name, sc->sc_name); 2806 return (EINVAL); 2807 } 2808 if ((sc->sc_sectorsize % pp->sectorsize) != 0) { 2809 G_MIRROR_DEBUG(1, 2810 "Invalid sector size of disk %s (device %s), skipping.", 2811 pp->name, sc->sc_name); 2812 return (EINVAL); 2813 } 2814 if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) { 2815 G_MIRROR_DEBUG(1, 2816 "Invalid device flags on disk %s (device %s), skipping.", 2817 pp->name, sc->sc_name); 2818 return (EINVAL); 2819 } 2820 if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) { 2821 G_MIRROR_DEBUG(1, 2822 "Invalid disk flags on disk %s (device %s), skipping.", 2823 pp->name, sc->sc_name); 2824 return (EINVAL); 2825 } 2826 return (0); 2827} 2828 2829int 2830g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp, 2831 struct g_mirror_metadata *md) 2832{ 2833 struct g_mirror_disk *disk; 2834 int error; 2835 2836 g_topology_assert_not(); 2837 G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name); 2838 2839 error = g_mirror_check_metadata(sc, pp, md); 2840 if (error != 0) 2841 return (error); 2842 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING && 2843 md->md_genid < sc->sc_genid) { 2844 G_MIRROR_DEBUG(0, "Component %s (device %s) broken, skipping.", 2845 pp->name, sc->sc_name); 2846 return (EINVAL); 2847 } 2848 disk = g_mirror_init_disk(sc, pp, md, &error); 2849 if (disk == NULL) 2850 return (error); 2851 error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW, 2852 G_MIRROR_EVENT_WAIT); 2853 if (error != 0) 2854 return (error); 2855 if (md->md_version < G_MIRROR_VERSION) { 2856 G_MIRROR_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).", 2857 pp->name, md->md_version, G_MIRROR_VERSION); 2858 g_mirror_update_metadata(disk); 2859 } 2860 return (0); 2861} 2862 2863static void 2864g_mirror_destroy_delayed(void *arg, int flag) 2865{ 2866 struct g_mirror_softc *sc; 2867 int error; 2868 2869 if (flag == EV_CANCEL) { 2870 G_MIRROR_DEBUG(1, "Destroying canceled."); 2871 return; 2872 } 2873 sc = arg; 2874 g_topology_unlock(); 2875 sx_xlock(&sc->sc_lock); 2876 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) == 0, 2877 ("DESTROY flag set on %s.", sc->sc_name)); 2878 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0, 2879 ("DESTROYING flag not set on %s.", sc->sc_name)); 2880 G_MIRROR_DEBUG(1, "Destroying %s (delayed).", sc->sc_name); 2881 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_SOFT); 2882 if (error != 0) { 2883 G_MIRROR_DEBUG(0, "Cannot destroy %s (error=%d).", 2884 sc->sc_name, error); 2885 sx_xunlock(&sc->sc_lock); 2886 } 2887 g_topology_lock(); 2888} 2889 2890static int 2891g_mirror_access(struct g_provider *pp, int acr, int acw, int ace) 2892{ 2893 struct g_mirror_softc *sc; 2894 int error = 0; 2895 2896 g_topology_assert(); 2897 G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr, 2898 acw, ace); 2899 2900 sc = pp->private; 2901 KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name)); 2902 2903 g_topology_unlock(); 2904 sx_xlock(&sc->sc_lock); 2905 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0 || 2906 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0 || 2907 LIST_EMPTY(&sc->sc_disks)) { 2908 if (acr > 0 || acw > 0 || ace > 0) 2909 error = ENXIO; 2910 goto end; 2911 } 2912 sc->sc_provider_open += acr + acw + ace; 2913 if (pp->acw + acw == 0) 2914 g_mirror_idle(sc, 0); 2915 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0 && 2916 sc->sc_provider_open == 0) 2917 g_post_event(g_mirror_destroy_delayed, sc, M_WAITOK, sc, NULL); 2918end: 2919 sx_xunlock(&sc->sc_lock); 2920 g_topology_lock(); 2921 return (error); 2922} 2923 2924static struct g_geom * 2925g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md) 2926{ 2927 struct g_mirror_softc *sc; 2928 struct g_geom *gp; 2929 int error, timeout; 2930 2931 g_topology_assert(); 2932 G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name, 2933 md->md_mid); 2934 2935 /* One disk is minimum. */ 2936 if (md->md_all < 1) 2937 return (NULL); 2938 /* 2939 * Action geom. 2940 */ 2941 gp = g_new_geomf(mp, "%s", md->md_name); 2942 sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO); 2943 gp->start = g_mirror_start; 2944 gp->orphan = g_mirror_orphan; 2945 gp->access = g_mirror_access; 2946 gp->dumpconf = g_mirror_dumpconf; 2947 2948 sc->sc_id = md->md_mid; 2949 sc->sc_slice = md->md_slice; 2950 sc->sc_balance = md->md_balance; 2951 sc->sc_mediasize = md->md_mediasize; 2952 sc->sc_sectorsize = md->md_sectorsize; 2953 sc->sc_ndisks = md->md_all; 2954 sc->sc_flags = md->md_mflags; 2955 sc->sc_bump_id = 0; 2956 sc->sc_idle = 1; 2957 sc->sc_last_write = time_uptime; 2958 sc->sc_writes = 0; 2959 sc->sc_refcnt = 1; 2960 sx_init(&sc->sc_lock, "gmirror:lock"); 2961 bioq_init(&sc->sc_queue); 2962 mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF); 2963 bioq_init(&sc->sc_regular_delayed); 2964 bioq_init(&sc->sc_inflight); 2965 bioq_init(&sc->sc_sync_delayed); 2966 LIST_INIT(&sc->sc_disks); 2967 TAILQ_INIT(&sc->sc_events); 2968 mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF); 2969 callout_init(&sc->sc_callout, CALLOUT_MPSAFE); 2970 mtx_init(&sc->sc_done_mtx, "gmirror:done", NULL, MTX_DEF); 2971 sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING; 2972 gp->softc = sc; 2973 sc->sc_geom = gp; 2974 sc->sc_provider = NULL; 2975 sc->sc_provider_open = 0; 2976 /* 2977 * Synchronization geom. 2978 */ 2979 gp = g_new_geomf(mp, "%s.sync", md->md_name); 2980 gp->softc = sc; 2981 gp->orphan = g_mirror_orphan; 2982 sc->sc_sync.ds_geom = gp; 2983 sc->sc_sync.ds_ndisks = 0; 2984 error = kproc_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0, 2985 "g_mirror %s", md->md_name); 2986 if (error != 0) { 2987 G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.", 2988 sc->sc_name); 2989 g_destroy_geom(sc->sc_sync.ds_geom); 2990 g_destroy_geom(sc->sc_geom); 2991 g_mirror_free_device(sc); 2992 return (NULL); 2993 } 2994 2995 G_MIRROR_DEBUG(1, "Device %s created (%u components, id=%u).", 2996 sc->sc_name, sc->sc_ndisks, sc->sc_id); 2997 2998 sc->sc_rootmount = root_mount_hold("GMIRROR"); 2999 G_MIRROR_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount); 3000 /* 3001 * Run timeout. 3002 */ 3003 timeout = g_mirror_timeout * hz; 3004 callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc); 3005 return (sc->sc_geom); 3006} 3007 3008int 3009g_mirror_destroy(struct g_mirror_softc *sc, int how) 3010{ 3011 struct g_mirror_disk *disk; 3012 3013 g_topology_assert_not(); 3014 sx_assert(&sc->sc_lock, SX_XLOCKED); 3015 3016 if (sc->sc_provider_open != 0) { 3017 switch (how) { 3018 case G_MIRROR_DESTROY_SOFT: 3019 G_MIRROR_DEBUG(1, 3020 "Device %s is still open (%d).", sc->sc_name, 3021 sc->sc_provider_open); 3022 return (EBUSY); 3023 case G_MIRROR_DESTROY_DELAYED: 3024 G_MIRROR_DEBUG(1, 3025 "Device %s will be destroyed on last close.", 3026 sc->sc_name); 3027 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 3028 if (disk->d_state == 3029 G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3030 g_mirror_sync_stop(disk, 1); 3031 } 3032 } 3033 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROYING; 3034 return (EBUSY); 3035 case G_MIRROR_DESTROY_HARD: 3036 G_MIRROR_DEBUG(1, "Device %s is still open, so it " 3037 "can't be definitely removed.", sc->sc_name); 3038 } 3039 } 3040 3041 g_topology_lock(); 3042 if (sc->sc_geom->softc == NULL) { 3043 g_topology_unlock(); 3044 return (0); 3045 } 3046 sc->sc_geom->softc = NULL; 3047 sc->sc_sync.ds_geom->softc = NULL; 3048 g_topology_unlock(); 3049 3050 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 3051 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_WAIT; 3052 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 3053 sx_xunlock(&sc->sc_lock); 3054 mtx_lock(&sc->sc_queue_mtx); 3055 wakeup(sc); 3056 mtx_unlock(&sc->sc_queue_mtx); 3057 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker); 3058 while (sc->sc_worker != NULL) 3059 tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5); 3060 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker); 3061 sx_xlock(&sc->sc_lock); 3062 g_mirror_destroy_device(sc); 3063 return (0); 3064} 3065 3066static void 3067g_mirror_taste_orphan(struct g_consumer *cp) 3068{ 3069 3070 KASSERT(1 == 0, ("%s called while tasting %s.", __func__, 3071 cp->provider->name)); 3072} 3073 3074static struct g_geom * 3075g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 3076{ 3077 struct g_mirror_metadata md; 3078 struct g_mirror_softc *sc; 3079 struct g_consumer *cp; 3080 struct g_geom *gp; 3081 int error; 3082 3083 g_topology_assert(); 3084 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 3085 G_MIRROR_DEBUG(2, "Tasting %s.", pp->name); 3086 3087 gp = g_new_geomf(mp, "mirror:taste"); 3088 /* 3089 * This orphan function should be never called. 3090 */ 3091 gp->orphan = g_mirror_taste_orphan; 3092 cp = g_new_consumer(gp); 3093 g_attach(cp, pp); 3094 error = g_mirror_read_metadata(cp, &md); 3095 g_detach(cp); 3096 g_destroy_consumer(cp); 3097 g_destroy_geom(gp); 3098 if (error != 0) 3099 return (NULL); 3100 gp = NULL; 3101 3102 if (md.md_provider[0] != '\0' && 3103 !g_compare_names(md.md_provider, pp->name)) 3104 return (NULL); 3105 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize) 3106 return (NULL); 3107 if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) { 3108 G_MIRROR_DEBUG(0, 3109 "Device %s: provider %s marked as inactive, skipping.", 3110 md.md_name, pp->name); 3111 return (NULL); 3112 } 3113 if (g_mirror_debug >= 2) 3114 mirror_metadata_dump(&md); 3115 3116 /* 3117 * Let's check if device already exists. 3118 */ 3119 sc = NULL; 3120 LIST_FOREACH(gp, &mp->geom, geom) { 3121 sc = gp->softc; 3122 if (sc == NULL) 3123 continue; 3124 if (sc->sc_sync.ds_geom == gp) 3125 continue; 3126 if (strcmp(md.md_name, sc->sc_name) != 0) 3127 continue; 3128 if (md.md_mid != sc->sc_id) { 3129 G_MIRROR_DEBUG(0, "Device %s already configured.", 3130 sc->sc_name); 3131 return (NULL); 3132 } 3133 break; 3134 } 3135 if (gp == NULL) { 3136 gp = g_mirror_create(mp, &md); 3137 if (gp == NULL) { 3138 G_MIRROR_DEBUG(0, "Cannot create device %s.", 3139 md.md_name); 3140 return (NULL); 3141 } 3142 sc = gp->softc; 3143 } 3144 G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name); 3145 g_topology_unlock(); 3146 sx_xlock(&sc->sc_lock); 3147 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_TASTING; 3148 error = g_mirror_add_disk(sc, pp, &md); 3149 if (error != 0) { 3150 G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).", 3151 pp->name, gp->name, error); 3152 if (LIST_EMPTY(&sc->sc_disks)) { 3153 g_cancel_event(sc); 3154 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3155 g_topology_lock(); 3156 return (NULL); 3157 } 3158 gp = NULL; 3159 } 3160 sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_TASTING; 3161 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 3162 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3163 g_topology_lock(); 3164 return (NULL); 3165 } 3166 sx_xunlock(&sc->sc_lock); 3167 g_topology_lock(); 3168 return (gp); 3169} 3170 3171static void 3172g_mirror_resize(struct g_consumer *cp) 3173{ 3174 struct g_mirror_disk *disk; 3175 3176 g_topology_assert(); 3177 g_trace(G_T_TOPOLOGY, "%s(%s)", __func__, cp->provider->name); 3178 3179 disk = cp->private; 3180 if (disk == NULL) 3181 return; 3182 g_topology_unlock(); 3183 g_mirror_update_metadata(disk); 3184 g_topology_lock(); 3185} 3186 3187static int 3188g_mirror_destroy_geom(struct gctl_req *req __unused, 3189 struct g_class *mp __unused, struct g_geom *gp) 3190{ 3191 struct g_mirror_softc *sc; 3192 int error; 3193 3194 g_topology_unlock(); 3195 sc = gp->softc; 3196 sx_xlock(&sc->sc_lock); 3197 g_cancel_event(sc); 3198 error = g_mirror_destroy(gp->softc, G_MIRROR_DESTROY_SOFT); 3199 if (error != 0) 3200 sx_xunlock(&sc->sc_lock); 3201 g_topology_lock(); 3202 return (error); 3203} 3204 3205static void 3206g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 3207 struct g_consumer *cp, struct g_provider *pp) 3208{ 3209 struct g_mirror_softc *sc; 3210 3211 g_topology_assert(); 3212 3213 sc = gp->softc; 3214 if (sc == NULL) 3215 return; 3216 /* Skip synchronization geom. */ 3217 if (gp == sc->sc_sync.ds_geom) 3218 return; 3219 if (pp != NULL) { 3220 /* Nothing here. */ 3221 } else if (cp != NULL) { 3222 struct g_mirror_disk *disk; 3223 3224 disk = cp->private; 3225 if (disk == NULL) 3226 return; 3227 g_topology_unlock(); 3228 sx_xlock(&sc->sc_lock); 3229 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id); 3230 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3231 sbuf_printf(sb, "%s<Synchronized>", indent); 3232 if (disk->d_sync.ds_offset == 0) 3233 sbuf_printf(sb, "0%%"); 3234 else { 3235 sbuf_printf(sb, "%u%%", 3236 (u_int)((disk->d_sync.ds_offset * 100) / 3237 sc->sc_provider->mediasize)); 3238 } 3239 sbuf_printf(sb, "</Synchronized>\n"); 3240 if (disk->d_sync.ds_offset > 0) { 3241 sbuf_printf(sb, "%s<BytesSynced>%jd" 3242 "</BytesSynced>\n", indent, 3243 (intmax_t)disk->d_sync.ds_offset); 3244 } 3245 } 3246 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, 3247 disk->d_sync.ds_syncid); 3248 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, 3249 disk->d_genid); 3250 sbuf_printf(sb, "%s<Flags>", indent); 3251 if (disk->d_flags == 0) 3252 sbuf_printf(sb, "NONE"); 3253 else { 3254 int first = 1; 3255 3256#define ADD_FLAG(flag, name) do { \ 3257 if ((disk->d_flags & (flag)) != 0) { \ 3258 if (!first) \ 3259 sbuf_printf(sb, ", "); \ 3260 else \ 3261 first = 0; \ 3262 sbuf_printf(sb, name); \ 3263 } \ 3264} while (0) 3265 ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY"); 3266 ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED"); 3267 ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE"); 3268 ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING, 3269 "SYNCHRONIZING"); 3270 ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC"); 3271 ADD_FLAG(G_MIRROR_DISK_FLAG_BROKEN, "BROKEN"); 3272#undef ADD_FLAG 3273 } 3274 sbuf_printf(sb, "</Flags>\n"); 3275 sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent, 3276 disk->d_priority); 3277 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 3278 g_mirror_disk_state2str(disk->d_state)); 3279 sx_xunlock(&sc->sc_lock); 3280 g_topology_lock(); 3281 } else { 3282 g_topology_unlock(); 3283 sx_xlock(&sc->sc_lock); 3284 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id); 3285 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid); 3286 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid); 3287 sbuf_printf(sb, "%s<Flags>", indent); 3288 if (sc->sc_flags == 0) 3289 sbuf_printf(sb, "NONE"); 3290 else { 3291 int first = 1; 3292 3293#define ADD_FLAG(flag, name) do { \ 3294 if ((sc->sc_flags & (flag)) != 0) { \ 3295 if (!first) \ 3296 sbuf_printf(sb, ", "); \ 3297 else \ 3298 first = 0; \ 3299 sbuf_printf(sb, name); \ 3300 } \ 3301} while (0) 3302 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC"); 3303 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC"); 3304#undef ADD_FLAG 3305 } 3306 sbuf_printf(sb, "</Flags>\n"); 3307 sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent, 3308 (u_int)sc->sc_slice); 3309 sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent, 3310 balance_name(sc->sc_balance)); 3311 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent, 3312 sc->sc_ndisks); 3313 sbuf_printf(sb, "%s<State>", indent); 3314 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 3315 sbuf_printf(sb, "%s", "STARTING"); 3316 else if (sc->sc_ndisks == 3317 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE)) 3318 sbuf_printf(sb, "%s", "COMPLETE"); 3319 else 3320 sbuf_printf(sb, "%s", "DEGRADED"); 3321 sbuf_printf(sb, "</State>\n"); 3322 sx_xunlock(&sc->sc_lock); 3323 g_topology_lock(); 3324 } 3325} 3326 3327static void 3328g_mirror_shutdown_post_sync(void *arg, int howto) 3329{ 3330 struct g_class *mp; 3331 struct g_geom *gp, *gp2; 3332 struct g_mirror_softc *sc; 3333 int error; 3334 3335 mp = arg; 3336 DROP_GIANT(); 3337 g_topology_lock(); 3338 g_mirror_shutdown = 1; 3339 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 3340 if ((sc = gp->softc) == NULL) 3341 continue; 3342 /* Skip synchronization geom. */ 3343 if (gp == sc->sc_sync.ds_geom) 3344 continue; 3345 g_topology_unlock(); 3346 sx_xlock(&sc->sc_lock); 3347 g_mirror_idle(sc, -1); 3348 g_cancel_event(sc); 3349 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_DELAYED); 3350 if (error != 0) 3351 sx_xunlock(&sc->sc_lock); 3352 g_topology_lock(); 3353 } 3354 g_topology_unlock(); 3355 PICKUP_GIANT(); 3356} 3357 3358static void 3359g_mirror_init(struct g_class *mp) 3360{ 3361 3362 g_mirror_post_sync = EVENTHANDLER_REGISTER(shutdown_post_sync, 3363 g_mirror_shutdown_post_sync, mp, SHUTDOWN_PRI_FIRST); 3364 if (g_mirror_post_sync == NULL) 3365 G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event."); 3366} 3367 3368static void 3369g_mirror_fini(struct g_class *mp) 3370{ 3371 3372 if (g_mirror_post_sync != NULL) 3373 EVENTHANDLER_DEREGISTER(shutdown_post_sync, g_mirror_post_sync); 3374} 3375 3376DECLARE_GEOM_CLASS(g_mirror_class, g_mirror); 3377