g_mirror.c revision 240371
1/*- 2 * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/geom/mirror/g_mirror.c 240371 2012-09-11 20:20:13Z glebius $"); 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_pre_sync = NULL; 85 86static int g_mirror_destroy_geom(struct gctl_req *req, struct g_class *mp, 87 struct g_geom *gp); 88static g_taste_t g_mirror_taste; 89static void g_mirror_init(struct g_class *mp); 90static void g_mirror_fini(struct g_class *mp); 91 92struct g_class g_mirror_class = { 93 .name = G_MIRROR_CLASS_NAME, 94 .version = G_VERSION, 95 .ctlreq = g_mirror_config, 96 .taste = g_mirror_taste, 97 .destroy_geom = g_mirror_destroy_geom, 98 .init = g_mirror_init, 99 .fini = g_mirror_fini 100}; 101 102 103static void g_mirror_destroy_provider(struct g_mirror_softc *sc); 104static int g_mirror_update_disk(struct g_mirror_disk *disk, u_int state); 105static void g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force); 106static void g_mirror_dumpconf(struct sbuf *sb, const char *indent, 107 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp); 108static void g_mirror_sync_stop(struct g_mirror_disk *disk, int type); 109static void g_mirror_register_request(struct bio *bp); 110static void g_mirror_sync_release(struct g_mirror_softc *sc); 111 112 113static const char * 114g_mirror_disk_state2str(int state) 115{ 116 117 switch (state) { 118 case G_MIRROR_DISK_STATE_NONE: 119 return ("NONE"); 120 case G_MIRROR_DISK_STATE_NEW: 121 return ("NEW"); 122 case G_MIRROR_DISK_STATE_ACTIVE: 123 return ("ACTIVE"); 124 case G_MIRROR_DISK_STATE_STALE: 125 return ("STALE"); 126 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 127 return ("SYNCHRONIZING"); 128 case G_MIRROR_DISK_STATE_DISCONNECTED: 129 return ("DISCONNECTED"); 130 case G_MIRROR_DISK_STATE_DESTROY: 131 return ("DESTROY"); 132 default: 133 return ("INVALID"); 134 } 135} 136 137static const char * 138g_mirror_device_state2str(int state) 139{ 140 141 switch (state) { 142 case G_MIRROR_DEVICE_STATE_STARTING: 143 return ("STARTING"); 144 case G_MIRROR_DEVICE_STATE_RUNNING: 145 return ("RUNNING"); 146 default: 147 return ("INVALID"); 148 } 149} 150 151static const char * 152g_mirror_get_diskname(struct g_mirror_disk *disk) 153{ 154 155 if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL) 156 return ("[unknown]"); 157 return (disk->d_name); 158} 159 160/* 161 * --- Events handling functions --- 162 * Events in geom_mirror are used to maintain disks and device status 163 * from one thread to simplify locking. 164 */ 165static void 166g_mirror_event_free(struct g_mirror_event *ep) 167{ 168 169 free(ep, M_MIRROR); 170} 171 172int 173g_mirror_event_send(void *arg, int state, int flags) 174{ 175 struct g_mirror_softc *sc; 176 struct g_mirror_disk *disk; 177 struct g_mirror_event *ep; 178 int error; 179 180 ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK); 181 G_MIRROR_DEBUG(4, "%s: Sending event %p.", __func__, ep); 182 if ((flags & G_MIRROR_EVENT_DEVICE) != 0) { 183 disk = NULL; 184 sc = arg; 185 } else { 186 disk = arg; 187 sc = disk->d_softc; 188 } 189 ep->e_disk = disk; 190 ep->e_state = state; 191 ep->e_flags = flags; 192 ep->e_error = 0; 193 mtx_lock(&sc->sc_events_mtx); 194 TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next); 195 mtx_unlock(&sc->sc_events_mtx); 196 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 197 mtx_lock(&sc->sc_queue_mtx); 198 wakeup(sc); 199 mtx_unlock(&sc->sc_queue_mtx); 200 if ((flags & G_MIRROR_EVENT_DONTWAIT) != 0) 201 return (0); 202 sx_assert(&sc->sc_lock, SX_XLOCKED); 203 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep); 204 sx_xunlock(&sc->sc_lock); 205 while ((ep->e_flags & G_MIRROR_EVENT_DONE) == 0) { 206 mtx_lock(&sc->sc_events_mtx); 207 MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "m:event", 208 hz * 5); 209 } 210 error = ep->e_error; 211 g_mirror_event_free(ep); 212 sx_xlock(&sc->sc_lock); 213 return (error); 214} 215 216static struct g_mirror_event * 217g_mirror_event_get(struct g_mirror_softc *sc) 218{ 219 struct g_mirror_event *ep; 220 221 mtx_lock(&sc->sc_events_mtx); 222 ep = TAILQ_FIRST(&sc->sc_events); 223 mtx_unlock(&sc->sc_events_mtx); 224 return (ep); 225} 226 227static void 228g_mirror_event_remove(struct g_mirror_softc *sc, struct g_mirror_event *ep) 229{ 230 231 mtx_lock(&sc->sc_events_mtx); 232 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 233 mtx_unlock(&sc->sc_events_mtx); 234} 235 236static void 237g_mirror_event_cancel(struct g_mirror_disk *disk) 238{ 239 struct g_mirror_softc *sc; 240 struct g_mirror_event *ep, *tmpep; 241 242 sc = disk->d_softc; 243 sx_assert(&sc->sc_lock, SX_XLOCKED); 244 245 mtx_lock(&sc->sc_events_mtx); 246 TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) { 247 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) 248 continue; 249 if (ep->e_disk != disk) 250 continue; 251 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 252 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 253 g_mirror_event_free(ep); 254 else { 255 ep->e_error = ECANCELED; 256 wakeup(ep); 257 } 258 } 259 mtx_unlock(&sc->sc_events_mtx); 260} 261 262/* 263 * Return the number of disks in given state. 264 * If state is equal to -1, count all connected disks. 265 */ 266u_int 267g_mirror_ndisks(struct g_mirror_softc *sc, int state) 268{ 269 struct g_mirror_disk *disk; 270 u_int n = 0; 271 272 sx_assert(&sc->sc_lock, SX_LOCKED); 273 274 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 275 if (state == -1 || disk->d_state == state) 276 n++; 277 } 278 return (n); 279} 280 281/* 282 * Find a disk in mirror by its disk ID. 283 */ 284static struct g_mirror_disk * 285g_mirror_id2disk(struct g_mirror_softc *sc, uint32_t id) 286{ 287 struct g_mirror_disk *disk; 288 289 sx_assert(&sc->sc_lock, SX_XLOCKED); 290 291 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 292 if (disk->d_id == id) 293 return (disk); 294 } 295 return (NULL); 296} 297 298static u_int 299g_mirror_nrequests(struct g_mirror_softc *sc, struct g_consumer *cp) 300{ 301 struct bio *bp; 302 u_int nreqs = 0; 303 304 mtx_lock(&sc->sc_queue_mtx); 305 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) { 306 if (bp->bio_from == cp) 307 nreqs++; 308 } 309 mtx_unlock(&sc->sc_queue_mtx); 310 return (nreqs); 311} 312 313static int 314g_mirror_is_busy(struct g_mirror_softc *sc, struct g_consumer *cp) 315{ 316 317 if (cp->index > 0) { 318 G_MIRROR_DEBUG(2, 319 "I/O requests for %s exist, can't destroy it now.", 320 cp->provider->name); 321 return (1); 322 } 323 if (g_mirror_nrequests(sc, cp) > 0) { 324 G_MIRROR_DEBUG(2, 325 "I/O requests for %s in queue, can't destroy it now.", 326 cp->provider->name); 327 return (1); 328 } 329 return (0); 330} 331 332static void 333g_mirror_destroy_consumer(void *arg, int flags __unused) 334{ 335 struct g_consumer *cp; 336 337 g_topology_assert(); 338 339 cp = arg; 340 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", cp->provider->name); 341 g_detach(cp); 342 g_destroy_consumer(cp); 343} 344 345static void 346g_mirror_kill_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 347{ 348 struct g_provider *pp; 349 int retaste_wait; 350 351 g_topology_assert(); 352 353 cp->private = NULL; 354 if (g_mirror_is_busy(sc, cp)) 355 return; 356 pp = cp->provider; 357 retaste_wait = 0; 358 if (cp->acw == 1) { 359 if ((pp->geom->flags & G_GEOM_WITHER) == 0) 360 retaste_wait = 1; 361 } 362 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", pp->name, -cp->acr, 363 -cp->acw, -cp->ace, 0); 364 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 365 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 366 if (retaste_wait) { 367 /* 368 * After retaste event was send (inside g_access()), we can send 369 * event to detach and destroy consumer. 370 * A class, which has consumer to the given provider connected 371 * will not receive retaste event for the provider. 372 * This is the way how I ignore retaste events when I close 373 * consumers opened for write: I detach and destroy consumer 374 * after retaste event is sent. 375 */ 376 g_post_event(g_mirror_destroy_consumer, cp, M_WAITOK, NULL); 377 return; 378 } 379 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", pp->name); 380 g_detach(cp); 381 g_destroy_consumer(cp); 382} 383 384static int 385g_mirror_connect_disk(struct g_mirror_disk *disk, struct g_provider *pp) 386{ 387 struct g_consumer *cp; 388 int error; 389 390 g_topology_assert_not(); 391 KASSERT(disk->d_consumer == NULL, 392 ("Disk already connected (device %s).", disk->d_softc->sc_name)); 393 394 g_topology_lock(); 395 cp = g_new_consumer(disk->d_softc->sc_geom); 396 error = g_attach(cp, pp); 397 if (error != 0) { 398 g_destroy_consumer(cp); 399 g_topology_unlock(); 400 return (error); 401 } 402 error = g_access(cp, 1, 1, 1); 403 if (error != 0) { 404 g_detach(cp); 405 g_destroy_consumer(cp); 406 g_topology_unlock(); 407 G_MIRROR_DEBUG(0, "Cannot open consumer %s (error=%d).", 408 pp->name, error); 409 return (error); 410 } 411 g_topology_unlock(); 412 disk->d_consumer = cp; 413 disk->d_consumer->private = disk; 414 disk->d_consumer->index = 0; 415 416 G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk)); 417 return (0); 418} 419 420static void 421g_mirror_disconnect_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 422{ 423 424 g_topology_assert(); 425 426 if (cp == NULL) 427 return; 428 if (cp->provider != NULL) 429 g_mirror_kill_consumer(sc, cp); 430 else 431 g_destroy_consumer(cp); 432} 433 434/* 435 * Initialize disk. This means allocate memory, create consumer, attach it 436 * to the provider and open access (r1w1e1) to it. 437 */ 438static struct g_mirror_disk * 439g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp, 440 struct g_mirror_metadata *md, int *errorp) 441{ 442 struct g_mirror_disk *disk; 443 int i, error; 444 445 disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO); 446 if (disk == NULL) { 447 error = ENOMEM; 448 goto fail; 449 } 450 disk->d_softc = sc; 451 error = g_mirror_connect_disk(disk, pp); 452 if (error != 0) 453 goto fail; 454 disk->d_id = md->md_did; 455 disk->d_state = G_MIRROR_DISK_STATE_NONE; 456 disk->d_priority = md->md_priority; 457 disk->d_flags = md->md_dflags; 458 error = g_getattr("GEOM::candelete", disk->d_consumer, &i); 459 if (error != 0) 460 goto fail; 461 if (i) 462 disk->d_flags |= G_MIRROR_DISK_FLAG_CANDELETE; 463 if (md->md_provider[0] != '\0') 464 disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED; 465 disk->d_sync.ds_consumer = NULL; 466 disk->d_sync.ds_offset = md->md_sync_offset; 467 disk->d_sync.ds_offset_done = md->md_sync_offset; 468 disk->d_genid = md->md_genid; 469 disk->d_sync.ds_syncid = md->md_syncid; 470 if (errorp != NULL) 471 *errorp = 0; 472 return (disk); 473fail: 474 if (errorp != NULL) 475 *errorp = error; 476 if (disk != NULL) 477 free(disk, M_MIRROR); 478 return (NULL); 479} 480 481static void 482g_mirror_destroy_disk(struct g_mirror_disk *disk) 483{ 484 struct g_mirror_softc *sc; 485 486 g_topology_assert_not(); 487 sc = disk->d_softc; 488 sx_assert(&sc->sc_lock, SX_XLOCKED); 489 490 LIST_REMOVE(disk, d_next); 491 g_mirror_event_cancel(disk); 492 if (sc->sc_hint == disk) 493 sc->sc_hint = NULL; 494 switch (disk->d_state) { 495 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 496 g_mirror_sync_stop(disk, 1); 497 /* FALLTHROUGH */ 498 case G_MIRROR_DISK_STATE_NEW: 499 case G_MIRROR_DISK_STATE_STALE: 500 case G_MIRROR_DISK_STATE_ACTIVE: 501 g_topology_lock(); 502 g_mirror_disconnect_consumer(sc, disk->d_consumer); 503 g_topology_unlock(); 504 free(disk, M_MIRROR); 505 break; 506 default: 507 KASSERT(0 == 1, ("Wrong disk state (%s, %s).", 508 g_mirror_get_diskname(disk), 509 g_mirror_disk_state2str(disk->d_state))); 510 } 511} 512 513static void 514g_mirror_destroy_device(struct g_mirror_softc *sc) 515{ 516 struct g_mirror_disk *disk; 517 struct g_mirror_event *ep; 518 struct g_geom *gp; 519 struct g_consumer *cp, *tmpcp; 520 521 g_topology_assert_not(); 522 sx_assert(&sc->sc_lock, SX_XLOCKED); 523 524 gp = sc->sc_geom; 525 if (sc->sc_provider != NULL) 526 g_mirror_destroy_provider(sc); 527 for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL; 528 disk = LIST_FIRST(&sc->sc_disks)) { 529 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 530 g_mirror_update_metadata(disk); 531 g_mirror_destroy_disk(disk); 532 } 533 while ((ep = g_mirror_event_get(sc)) != NULL) { 534 g_mirror_event_remove(sc, ep); 535 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 536 g_mirror_event_free(ep); 537 else { 538 ep->e_error = ECANCELED; 539 ep->e_flags |= G_MIRROR_EVENT_DONE; 540 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep); 541 mtx_lock(&sc->sc_events_mtx); 542 wakeup(ep); 543 mtx_unlock(&sc->sc_events_mtx); 544 } 545 } 546 callout_drain(&sc->sc_callout); 547 548 g_topology_lock(); 549 LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) { 550 g_mirror_disconnect_consumer(sc, cp); 551 } 552 g_wither_geom(sc->sc_sync.ds_geom, ENXIO); 553 G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name); 554 g_wither_geom(gp, ENXIO); 555 g_topology_unlock(); 556 mtx_destroy(&sc->sc_queue_mtx); 557 mtx_destroy(&sc->sc_events_mtx); 558 sx_xunlock(&sc->sc_lock); 559 sx_destroy(&sc->sc_lock); 560} 561 562static void 563g_mirror_orphan(struct g_consumer *cp) 564{ 565 struct g_mirror_disk *disk; 566 567 g_topology_assert(); 568 569 disk = cp->private; 570 if (disk == NULL) 571 return; 572 disk->d_softc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 573 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 574 G_MIRROR_EVENT_DONTWAIT); 575} 576 577/* 578 * Function should return the next active disk on the list. 579 * It is possible that it will be the same disk as given. 580 * If there are no active disks on list, NULL is returned. 581 */ 582static __inline struct g_mirror_disk * 583g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 584{ 585 struct g_mirror_disk *dp; 586 587 for (dp = LIST_NEXT(disk, d_next); dp != disk; 588 dp = LIST_NEXT(dp, d_next)) { 589 if (dp == NULL) 590 dp = LIST_FIRST(&sc->sc_disks); 591 if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE) 592 break; 593 } 594 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 595 return (NULL); 596 return (dp); 597} 598 599static struct g_mirror_disk * 600g_mirror_get_disk(struct g_mirror_softc *sc) 601{ 602 struct g_mirror_disk *disk; 603 604 if (sc->sc_hint == NULL) { 605 sc->sc_hint = LIST_FIRST(&sc->sc_disks); 606 if (sc->sc_hint == NULL) 607 return (NULL); 608 } 609 disk = sc->sc_hint; 610 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) { 611 disk = g_mirror_find_next(sc, disk); 612 if (disk == NULL) 613 return (NULL); 614 } 615 sc->sc_hint = g_mirror_find_next(sc, disk); 616 return (disk); 617} 618 619static int 620g_mirror_write_metadata(struct g_mirror_disk *disk, 621 struct g_mirror_metadata *md) 622{ 623 struct g_mirror_softc *sc; 624 struct g_consumer *cp; 625 off_t offset, length; 626 u_char *sector; 627 int error = 0; 628 629 g_topology_assert_not(); 630 sc = disk->d_softc; 631 sx_assert(&sc->sc_lock, SX_LOCKED); 632 633 cp = disk->d_consumer; 634 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name)); 635 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name)); 636 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 637 ("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr, 638 cp->acw, cp->ace)); 639 length = cp->provider->sectorsize; 640 offset = cp->provider->mediasize - length; 641 sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO); 642 if (md != NULL) 643 mirror_metadata_encode(md, sector); 644 error = g_write_data(cp, offset, sector, length); 645 free(sector, M_MIRROR); 646 if (error != 0) { 647 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 648 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 649 G_MIRROR_DEBUG(0, "Cannot write metadata on %s " 650 "(device=%s, error=%d).", 651 g_mirror_get_diskname(disk), sc->sc_name, error); 652 } else { 653 G_MIRROR_DEBUG(1, "Cannot write metadata on %s " 654 "(device=%s, error=%d).", 655 g_mirror_get_diskname(disk), sc->sc_name, error); 656 } 657 if (g_mirror_disconnect_on_failure && 658 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) { 659 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 660 g_mirror_event_send(disk, 661 G_MIRROR_DISK_STATE_DISCONNECTED, 662 G_MIRROR_EVENT_DONTWAIT); 663 } 664 } 665 return (error); 666} 667 668static int 669g_mirror_clear_metadata(struct g_mirror_disk *disk) 670{ 671 int error; 672 673 g_topology_assert_not(); 674 sx_assert(&disk->d_softc->sc_lock, SX_LOCKED); 675 676 error = g_mirror_write_metadata(disk, NULL); 677 if (error == 0) { 678 G_MIRROR_DEBUG(2, "Metadata on %s cleared.", 679 g_mirror_get_diskname(disk)); 680 } else { 681 G_MIRROR_DEBUG(0, 682 "Cannot clear metadata on disk %s (error=%d).", 683 g_mirror_get_diskname(disk), error); 684 } 685 return (error); 686} 687 688void 689g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk, 690 struct g_mirror_metadata *md) 691{ 692 693 strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic)); 694 md->md_version = G_MIRROR_VERSION; 695 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name)); 696 md->md_mid = sc->sc_id; 697 md->md_all = sc->sc_ndisks; 698 md->md_slice = sc->sc_slice; 699 md->md_balance = sc->sc_balance; 700 md->md_genid = sc->sc_genid; 701 md->md_mediasize = sc->sc_mediasize; 702 md->md_sectorsize = sc->sc_sectorsize; 703 md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK); 704 bzero(md->md_provider, sizeof(md->md_provider)); 705 if (disk == NULL) { 706 md->md_did = arc4random(); 707 md->md_priority = 0; 708 md->md_syncid = 0; 709 md->md_dflags = 0; 710 md->md_sync_offset = 0; 711 md->md_provsize = 0; 712 } else { 713 md->md_did = disk->d_id; 714 md->md_priority = disk->d_priority; 715 md->md_syncid = disk->d_sync.ds_syncid; 716 md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK); 717 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 718 md->md_sync_offset = disk->d_sync.ds_offset_done; 719 else 720 md->md_sync_offset = 0; 721 if ((disk->d_flags & G_MIRROR_DISK_FLAG_HARDCODED) != 0) { 722 strlcpy(md->md_provider, 723 disk->d_consumer->provider->name, 724 sizeof(md->md_provider)); 725 } 726 md->md_provsize = disk->d_consumer->provider->mediasize; 727 } 728} 729 730void 731g_mirror_update_metadata(struct g_mirror_disk *disk) 732{ 733 struct g_mirror_softc *sc; 734 struct g_mirror_metadata md; 735 int error; 736 737 g_topology_assert_not(); 738 sc = disk->d_softc; 739 sx_assert(&sc->sc_lock, SX_LOCKED); 740 741 g_mirror_fill_metadata(sc, disk, &md); 742 error = g_mirror_write_metadata(disk, &md); 743 if (error == 0) { 744 G_MIRROR_DEBUG(2, "Metadata on %s updated.", 745 g_mirror_get_diskname(disk)); 746 } else { 747 G_MIRROR_DEBUG(0, 748 "Cannot update metadata on disk %s (error=%d).", 749 g_mirror_get_diskname(disk), error); 750 } 751} 752 753static void 754g_mirror_bump_syncid(struct g_mirror_softc *sc) 755{ 756 struct g_mirror_disk *disk; 757 758 g_topology_assert_not(); 759 sx_assert(&sc->sc_lock, SX_XLOCKED); 760 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 761 ("%s called with no active disks (device=%s).", __func__, 762 sc->sc_name)); 763 764 sc->sc_syncid++; 765 G_MIRROR_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name, 766 sc->sc_syncid); 767 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 768 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 769 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 770 disk->d_sync.ds_syncid = sc->sc_syncid; 771 g_mirror_update_metadata(disk); 772 } 773 } 774} 775 776static void 777g_mirror_bump_genid(struct g_mirror_softc *sc) 778{ 779 struct g_mirror_disk *disk; 780 781 g_topology_assert_not(); 782 sx_assert(&sc->sc_lock, SX_XLOCKED); 783 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 784 ("%s called with no active disks (device=%s).", __func__, 785 sc->sc_name)); 786 787 sc->sc_genid++; 788 G_MIRROR_DEBUG(1, "Device %s: genid bumped to %u.", sc->sc_name, 789 sc->sc_genid); 790 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 791 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 792 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 793 disk->d_genid = sc->sc_genid; 794 g_mirror_update_metadata(disk); 795 } 796 } 797} 798 799static int 800g_mirror_idle(struct g_mirror_softc *sc, int acw) 801{ 802 struct g_mirror_disk *disk; 803 int timeout; 804 805 g_topology_assert_not(); 806 sx_assert(&sc->sc_lock, SX_XLOCKED); 807 808 if (sc->sc_provider == NULL) 809 return (0); 810 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 811 return (0); 812 if (sc->sc_idle) 813 return (0); 814 if (sc->sc_writes > 0) 815 return (0); 816 if (acw > 0 || (acw == -1 && sc->sc_provider->acw > 0)) { 817 timeout = g_mirror_idletime - (time_uptime - sc->sc_last_write); 818 if (timeout > 0) 819 return (timeout); 820 } 821 sc->sc_idle = 1; 822 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 823 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 824 continue; 825 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.", 826 g_mirror_get_diskname(disk), sc->sc_name); 827 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 828 g_mirror_update_metadata(disk); 829 } 830 return (0); 831} 832 833static void 834g_mirror_unidle(struct g_mirror_softc *sc) 835{ 836 struct g_mirror_disk *disk; 837 838 g_topology_assert_not(); 839 sx_assert(&sc->sc_lock, SX_XLOCKED); 840 841 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 842 return; 843 sc->sc_idle = 0; 844 sc->sc_last_write = time_uptime; 845 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 846 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 847 continue; 848 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.", 849 g_mirror_get_diskname(disk), sc->sc_name); 850 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 851 g_mirror_update_metadata(disk); 852 } 853} 854 855static void 856g_mirror_done(struct bio *bp) 857{ 858 struct g_mirror_softc *sc; 859 860 sc = bp->bio_from->geom->softc; 861 bp->bio_cflags = G_MIRROR_BIO_FLAG_REGULAR; 862 mtx_lock(&sc->sc_queue_mtx); 863 bioq_disksort(&sc->sc_queue, bp); 864 mtx_unlock(&sc->sc_queue_mtx); 865 wakeup(sc); 866} 867 868static void 869g_mirror_regular_request(struct bio *bp) 870{ 871 struct g_mirror_softc *sc; 872 struct g_mirror_disk *disk; 873 struct bio *pbp; 874 875 g_topology_assert_not(); 876 877 pbp = bp->bio_parent; 878 sc = pbp->bio_to->geom->softc; 879 bp->bio_from->index--; 880 if (bp->bio_cmd == BIO_WRITE) 881 sc->sc_writes--; 882 disk = bp->bio_from->private; 883 if (disk == NULL) { 884 g_topology_lock(); 885 g_mirror_kill_consumer(sc, bp->bio_from); 886 g_topology_unlock(); 887 } 888 889 pbp->bio_inbed++; 890 KASSERT(pbp->bio_inbed <= pbp->bio_children, 891 ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed, 892 pbp->bio_children)); 893 if (bp->bio_error == 0 && pbp->bio_error == 0) { 894 G_MIRROR_LOGREQ(3, bp, "Request delivered."); 895 g_destroy_bio(bp); 896 if (pbp->bio_children == pbp->bio_inbed) { 897 G_MIRROR_LOGREQ(3, pbp, "Request delivered."); 898 pbp->bio_completed = pbp->bio_length; 899 if (pbp->bio_cmd == BIO_WRITE || 900 pbp->bio_cmd == BIO_DELETE) { 901 bioq_remove(&sc->sc_inflight, pbp); 902 /* Release delayed sync requests if possible. */ 903 g_mirror_sync_release(sc); 904 } 905 g_io_deliver(pbp, pbp->bio_error); 906 } 907 return; 908 } else if (bp->bio_error != 0) { 909 if (pbp->bio_error == 0) 910 pbp->bio_error = bp->bio_error; 911 if (disk != NULL) { 912 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 913 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 914 G_MIRROR_LOGREQ(0, bp, 915 "Request failed (error=%d).", 916 bp->bio_error); 917 } else { 918 G_MIRROR_LOGREQ(1, bp, 919 "Request failed (error=%d).", 920 bp->bio_error); 921 } 922 if (g_mirror_disconnect_on_failure && 923 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) 924 { 925 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 926 g_mirror_event_send(disk, 927 G_MIRROR_DISK_STATE_DISCONNECTED, 928 G_MIRROR_EVENT_DONTWAIT); 929 } 930 } 931 switch (pbp->bio_cmd) { 932 case BIO_DELETE: 933 case BIO_WRITE: 934 pbp->bio_inbed--; 935 pbp->bio_children--; 936 break; 937 } 938 } 939 g_destroy_bio(bp); 940 941 switch (pbp->bio_cmd) { 942 case BIO_READ: 943 if (pbp->bio_inbed < pbp->bio_children) 944 break; 945 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 1) 946 g_io_deliver(pbp, pbp->bio_error); 947 else { 948 pbp->bio_error = 0; 949 mtx_lock(&sc->sc_queue_mtx); 950 bioq_disksort(&sc->sc_queue, pbp); 951 mtx_unlock(&sc->sc_queue_mtx); 952 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 953 wakeup(sc); 954 } 955 break; 956 case BIO_DELETE: 957 case BIO_WRITE: 958 if (pbp->bio_children == 0) { 959 /* 960 * All requests failed. 961 */ 962 } else if (pbp->bio_inbed < pbp->bio_children) { 963 /* Do nothing. */ 964 break; 965 } else if (pbp->bio_children == pbp->bio_inbed) { 966 /* Some requests succeeded. */ 967 pbp->bio_error = 0; 968 pbp->bio_completed = pbp->bio_length; 969 } 970 bioq_remove(&sc->sc_inflight, pbp); 971 /* Release delayed sync requests if possible. */ 972 g_mirror_sync_release(sc); 973 g_io_deliver(pbp, pbp->bio_error); 974 break; 975 default: 976 KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd)); 977 break; 978 } 979} 980 981static void 982g_mirror_sync_done(struct bio *bp) 983{ 984 struct g_mirror_softc *sc; 985 986 G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered."); 987 sc = bp->bio_from->geom->softc; 988 bp->bio_cflags = G_MIRROR_BIO_FLAG_SYNC; 989 mtx_lock(&sc->sc_queue_mtx); 990 bioq_disksort(&sc->sc_queue, bp); 991 mtx_unlock(&sc->sc_queue_mtx); 992 wakeup(sc); 993} 994 995static void 996g_mirror_kernel_dump(struct bio *bp) 997{ 998 struct g_mirror_softc *sc; 999 struct g_mirror_disk *disk; 1000 struct bio *cbp; 1001 struct g_kerneldump *gkd; 1002 1003 /* 1004 * We configure dumping to the first component, because this component 1005 * will be used for reading with 'prefer' balance algorithm. 1006 * If the component with the higest priority is currently disconnected 1007 * we will not be able to read the dump after the reboot if it will be 1008 * connected and synchronized later. Can we do something better? 1009 */ 1010 sc = bp->bio_to->geom->softc; 1011 disk = LIST_FIRST(&sc->sc_disks); 1012 1013 gkd = (struct g_kerneldump *)bp->bio_data; 1014 if (gkd->length > bp->bio_to->mediasize) 1015 gkd->length = bp->bio_to->mediasize; 1016 cbp = g_clone_bio(bp); 1017 if (cbp == NULL) { 1018 g_io_deliver(bp, ENOMEM); 1019 return; 1020 } 1021 cbp->bio_done = g_std_done; 1022 g_io_request(cbp, disk->d_consumer); 1023 G_MIRROR_DEBUG(1, "Kernel dump will go to %s.", 1024 g_mirror_get_diskname(disk)); 1025} 1026 1027static void 1028g_mirror_flush(struct g_mirror_softc *sc, struct bio *bp) 1029{ 1030 struct bio_queue_head queue; 1031 struct g_mirror_disk *disk; 1032 struct g_consumer *cp; 1033 struct bio *cbp; 1034 1035 bioq_init(&queue); 1036 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1037 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1038 continue; 1039 cbp = g_clone_bio(bp); 1040 if (cbp == NULL) { 1041 for (cbp = bioq_first(&queue); cbp != NULL; 1042 cbp = bioq_first(&queue)) { 1043 bioq_remove(&queue, cbp); 1044 g_destroy_bio(cbp); 1045 } 1046 if (bp->bio_error == 0) 1047 bp->bio_error = ENOMEM; 1048 g_io_deliver(bp, bp->bio_error); 1049 return; 1050 } 1051 bioq_insert_tail(&queue, cbp); 1052 cbp->bio_done = g_std_done; 1053 cbp->bio_caller1 = disk; 1054 cbp->bio_to = disk->d_consumer->provider; 1055 } 1056 for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) { 1057 bioq_remove(&queue, cbp); 1058 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1059 disk = cbp->bio_caller1; 1060 cbp->bio_caller1 = NULL; 1061 cp = disk->d_consumer; 1062 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1063 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1064 cp->acr, cp->acw, cp->ace)); 1065 g_io_request(cbp, disk->d_consumer); 1066 } 1067} 1068 1069static void 1070g_mirror_start(struct bio *bp) 1071{ 1072 struct g_mirror_softc *sc; 1073 1074 sc = bp->bio_to->geom->softc; 1075 /* 1076 * If sc == NULL or there are no valid disks, provider's error 1077 * should be set and g_mirror_start() should not be called at all. 1078 */ 1079 KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1080 ("Provider's error should be set (error=%d)(mirror=%s).", 1081 bp->bio_to->error, bp->bio_to->name)); 1082 G_MIRROR_LOGREQ(3, bp, "Request received."); 1083 1084 switch (bp->bio_cmd) { 1085 case BIO_READ: 1086 case BIO_WRITE: 1087 case BIO_DELETE: 1088 break; 1089 case BIO_FLUSH: 1090 g_mirror_flush(sc, bp); 1091 return; 1092 case BIO_GETATTR: 1093 if (g_handleattr_int(bp, "GEOM::candelete", 1)) 1094 return; 1095 else if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) { 1096 g_mirror_kernel_dump(bp); 1097 return; 1098 } 1099 /* FALLTHROUGH */ 1100 default: 1101 g_io_deliver(bp, EOPNOTSUPP); 1102 return; 1103 } 1104 mtx_lock(&sc->sc_queue_mtx); 1105 bioq_disksort(&sc->sc_queue, bp); 1106 mtx_unlock(&sc->sc_queue_mtx); 1107 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 1108 wakeup(sc); 1109} 1110 1111/* 1112 * Return TRUE if the given request is colliding with a in-progress 1113 * synchronization request. 1114 */ 1115static int 1116g_mirror_sync_collision(struct g_mirror_softc *sc, struct bio *bp) 1117{ 1118 struct g_mirror_disk *disk; 1119 struct bio *sbp; 1120 off_t rstart, rend, sstart, send; 1121 int i; 1122 1123 if (sc->sc_sync.ds_ndisks == 0) 1124 return (0); 1125 rstart = bp->bio_offset; 1126 rend = bp->bio_offset + bp->bio_length; 1127 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1128 if (disk->d_state != G_MIRROR_DISK_STATE_SYNCHRONIZING) 1129 continue; 1130 for (i = 0; i < g_mirror_syncreqs; i++) { 1131 sbp = disk->d_sync.ds_bios[i]; 1132 if (sbp == NULL) 1133 continue; 1134 sstart = sbp->bio_offset; 1135 send = sbp->bio_offset + sbp->bio_length; 1136 if (rend > sstart && rstart < send) 1137 return (1); 1138 } 1139 } 1140 return (0); 1141} 1142 1143/* 1144 * Return TRUE if the given sync request is colliding with a in-progress regular 1145 * request. 1146 */ 1147static int 1148g_mirror_regular_collision(struct g_mirror_softc *sc, struct bio *sbp) 1149{ 1150 off_t rstart, rend, sstart, send; 1151 struct bio *bp; 1152 1153 if (sc->sc_sync.ds_ndisks == 0) 1154 return (0); 1155 sstart = sbp->bio_offset; 1156 send = sbp->bio_offset + sbp->bio_length; 1157 TAILQ_FOREACH(bp, &sc->sc_inflight.queue, bio_queue) { 1158 rstart = bp->bio_offset; 1159 rend = bp->bio_offset + bp->bio_length; 1160 if (rend > sstart && rstart < send) 1161 return (1); 1162 } 1163 return (0); 1164} 1165 1166/* 1167 * Puts request onto delayed queue. 1168 */ 1169static void 1170g_mirror_regular_delay(struct g_mirror_softc *sc, struct bio *bp) 1171{ 1172 1173 G_MIRROR_LOGREQ(2, bp, "Delaying request."); 1174 bioq_insert_head(&sc->sc_regular_delayed, bp); 1175} 1176 1177/* 1178 * Puts synchronization request onto delayed queue. 1179 */ 1180static void 1181g_mirror_sync_delay(struct g_mirror_softc *sc, struct bio *bp) 1182{ 1183 1184 G_MIRROR_LOGREQ(2, bp, "Delaying synchronization request."); 1185 bioq_insert_tail(&sc->sc_sync_delayed, bp); 1186} 1187 1188/* 1189 * Releases delayed regular requests which don't collide anymore with sync 1190 * requests. 1191 */ 1192static void 1193g_mirror_regular_release(struct g_mirror_softc *sc) 1194{ 1195 struct bio *bp, *bp2; 1196 1197 TAILQ_FOREACH_SAFE(bp, &sc->sc_regular_delayed.queue, bio_queue, bp2) { 1198 if (g_mirror_sync_collision(sc, bp)) 1199 continue; 1200 bioq_remove(&sc->sc_regular_delayed, bp); 1201 G_MIRROR_LOGREQ(2, bp, "Releasing delayed request (%p).", bp); 1202 mtx_lock(&sc->sc_queue_mtx); 1203 bioq_insert_head(&sc->sc_queue, bp); 1204#if 0 1205 /* 1206 * wakeup() is not needed, because this function is called from 1207 * the worker thread. 1208 */ 1209 wakeup(&sc->sc_queue); 1210#endif 1211 mtx_unlock(&sc->sc_queue_mtx); 1212 } 1213} 1214 1215/* 1216 * Releases delayed sync requests which don't collide anymore with regular 1217 * requests. 1218 */ 1219static void 1220g_mirror_sync_release(struct g_mirror_softc *sc) 1221{ 1222 struct bio *bp, *bp2; 1223 1224 TAILQ_FOREACH_SAFE(bp, &sc->sc_sync_delayed.queue, bio_queue, bp2) { 1225 if (g_mirror_regular_collision(sc, bp)) 1226 continue; 1227 bioq_remove(&sc->sc_sync_delayed, bp); 1228 G_MIRROR_LOGREQ(2, bp, 1229 "Releasing delayed synchronization request."); 1230 g_io_request(bp, bp->bio_from); 1231 } 1232} 1233 1234/* 1235 * Handle synchronization requests. 1236 * Every synchronization request is two-steps process: first, READ request is 1237 * send to active provider and then WRITE request (with read data) to the provider 1238 * beeing synchronized. When WRITE is finished, new synchronization request is 1239 * send. 1240 */ 1241static void 1242g_mirror_sync_request(struct bio *bp) 1243{ 1244 struct g_mirror_softc *sc; 1245 struct g_mirror_disk *disk; 1246 1247 bp->bio_from->index--; 1248 sc = bp->bio_from->geom->softc; 1249 disk = bp->bio_from->private; 1250 if (disk == NULL) { 1251 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 1252 g_topology_lock(); 1253 g_mirror_kill_consumer(sc, bp->bio_from); 1254 g_topology_unlock(); 1255 free(bp->bio_data, M_MIRROR); 1256 g_destroy_bio(bp); 1257 sx_xlock(&sc->sc_lock); 1258 return; 1259 } 1260 1261 /* 1262 * Synchronization request. 1263 */ 1264 switch (bp->bio_cmd) { 1265 case BIO_READ: 1266 { 1267 struct g_consumer *cp; 1268 1269 if (bp->bio_error != 0) { 1270 G_MIRROR_LOGREQ(0, bp, 1271 "Synchronization request failed (error=%d).", 1272 bp->bio_error); 1273 g_destroy_bio(bp); 1274 return; 1275 } 1276 G_MIRROR_LOGREQ(3, bp, 1277 "Synchronization request half-finished."); 1278 bp->bio_cmd = BIO_WRITE; 1279 bp->bio_cflags = 0; 1280 cp = disk->d_consumer; 1281 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1282 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1283 cp->acr, cp->acw, cp->ace)); 1284 cp->index++; 1285 g_io_request(bp, cp); 1286 return; 1287 } 1288 case BIO_WRITE: 1289 { 1290 struct g_mirror_disk_sync *sync; 1291 off_t offset; 1292 void *data; 1293 int i; 1294 1295 if (bp->bio_error != 0) { 1296 G_MIRROR_LOGREQ(0, bp, 1297 "Synchronization request failed (error=%d).", 1298 bp->bio_error); 1299 g_destroy_bio(bp); 1300 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 1301 g_mirror_event_send(disk, 1302 G_MIRROR_DISK_STATE_DISCONNECTED, 1303 G_MIRROR_EVENT_DONTWAIT); 1304 return; 1305 } 1306 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished."); 1307 sync = &disk->d_sync; 1308 if (sync->ds_offset == sc->sc_mediasize || 1309 sync->ds_consumer == NULL || 1310 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1311 /* Don't send more synchronization requests. */ 1312 sync->ds_inflight--; 1313 if (sync->ds_bios != NULL) { 1314 i = (int)(uintptr_t)bp->bio_caller1; 1315 sync->ds_bios[i] = NULL; 1316 } 1317 free(bp->bio_data, M_MIRROR); 1318 g_destroy_bio(bp); 1319 if (sync->ds_inflight > 0) 1320 return; 1321 if (sync->ds_consumer == NULL || 1322 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1323 return; 1324 } 1325 /* Disk up-to-date, activate it. */ 1326 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE, 1327 G_MIRROR_EVENT_DONTWAIT); 1328 return; 1329 } 1330 1331 /* Send next synchronization request. */ 1332 data = bp->bio_data; 1333 bzero(bp, sizeof(*bp)); 1334 bp->bio_cmd = BIO_READ; 1335 bp->bio_offset = sync->ds_offset; 1336 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset); 1337 sync->ds_offset += bp->bio_length; 1338 bp->bio_done = g_mirror_sync_done; 1339 bp->bio_data = data; 1340 bp->bio_from = sync->ds_consumer; 1341 bp->bio_to = sc->sc_provider; 1342 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 1343 sync->ds_consumer->index++; 1344 /* 1345 * Delay the request if it is colliding with a regular request. 1346 */ 1347 if (g_mirror_regular_collision(sc, bp)) 1348 g_mirror_sync_delay(sc, bp); 1349 else 1350 g_io_request(bp, sync->ds_consumer); 1351 1352 /* Release delayed requests if possible. */ 1353 g_mirror_regular_release(sc); 1354 1355 /* Find the smallest offset */ 1356 offset = sc->sc_mediasize; 1357 for (i = 0; i < g_mirror_syncreqs; i++) { 1358 bp = sync->ds_bios[i]; 1359 if (bp->bio_offset < offset) 1360 offset = bp->bio_offset; 1361 } 1362 if (sync->ds_offset_done + (MAXPHYS * 100) < offset) { 1363 /* Update offset_done on every 100 blocks. */ 1364 sync->ds_offset_done = offset; 1365 g_mirror_update_metadata(disk); 1366 } 1367 return; 1368 } 1369 default: 1370 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1371 bp->bio_cmd, sc->sc_name)); 1372 break; 1373 } 1374} 1375 1376static void 1377g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp) 1378{ 1379 struct g_mirror_disk *disk; 1380 struct g_consumer *cp; 1381 struct bio *cbp; 1382 1383 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1384 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE) 1385 break; 1386 } 1387 if (disk == NULL) { 1388 if (bp->bio_error == 0) 1389 bp->bio_error = ENXIO; 1390 g_io_deliver(bp, bp->bio_error); 1391 return; 1392 } 1393 cbp = g_clone_bio(bp); 1394 if (cbp == NULL) { 1395 if (bp->bio_error == 0) 1396 bp->bio_error = ENOMEM; 1397 g_io_deliver(bp, bp->bio_error); 1398 return; 1399 } 1400 /* 1401 * Fill in the component buf structure. 1402 */ 1403 cp = disk->d_consumer; 1404 cbp->bio_done = g_mirror_done; 1405 cbp->bio_to = cp->provider; 1406 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1407 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1408 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1409 cp->acw, cp->ace)); 1410 cp->index++; 1411 g_io_request(cbp, cp); 1412} 1413 1414static void 1415g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp) 1416{ 1417 struct g_mirror_disk *disk; 1418 struct g_consumer *cp; 1419 struct bio *cbp; 1420 1421 disk = g_mirror_get_disk(sc); 1422 if (disk == NULL) { 1423 if (bp->bio_error == 0) 1424 bp->bio_error = ENXIO; 1425 g_io_deliver(bp, bp->bio_error); 1426 return; 1427 } 1428 cbp = g_clone_bio(bp); 1429 if (cbp == NULL) { 1430 if (bp->bio_error == 0) 1431 bp->bio_error = ENOMEM; 1432 g_io_deliver(bp, bp->bio_error); 1433 return; 1434 } 1435 /* 1436 * Fill in the component buf structure. 1437 */ 1438 cp = disk->d_consumer; 1439 cbp->bio_done = g_mirror_done; 1440 cbp->bio_to = cp->provider; 1441 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1442 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1443 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1444 cp->acw, cp->ace)); 1445 cp->index++; 1446 g_io_request(cbp, cp); 1447} 1448 1449#define TRACK_SIZE (1 * 1024 * 1024) 1450#define LOAD_SCALE 256 1451#define ABS(x) (((x) >= 0) ? (x) : (-(x))) 1452 1453static void 1454g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp) 1455{ 1456 struct g_mirror_disk *disk, *dp; 1457 struct g_consumer *cp; 1458 struct bio *cbp; 1459 int prio, best; 1460 1461 /* Find a disk with the smallest load. */ 1462 disk = NULL; 1463 best = INT_MAX; 1464 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1465 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1466 continue; 1467 prio = dp->load; 1468 /* If disk head is precisely in position - highly prefer it. */ 1469 if (dp->d_last_offset == bp->bio_offset) 1470 prio -= 2 * LOAD_SCALE; 1471 else 1472 /* If disk head is close to position - prefer it. */ 1473 if (ABS(dp->d_last_offset - bp->bio_offset) < TRACK_SIZE) 1474 prio -= 1 * LOAD_SCALE; 1475 if (prio <= best) { 1476 disk = dp; 1477 best = prio; 1478 } 1479 } 1480 KASSERT(disk != NULL, ("NULL disk for %s.", sc->sc_name)); 1481 cbp = g_clone_bio(bp); 1482 if (cbp == NULL) { 1483 if (bp->bio_error == 0) 1484 bp->bio_error = ENOMEM; 1485 g_io_deliver(bp, bp->bio_error); 1486 return; 1487 } 1488 /* 1489 * Fill in the component buf structure. 1490 */ 1491 cp = disk->d_consumer; 1492 cbp->bio_done = g_mirror_done; 1493 cbp->bio_to = cp->provider; 1494 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1495 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1496 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1497 cp->acw, cp->ace)); 1498 cp->index++; 1499 /* Remember last head position */ 1500 disk->d_last_offset = bp->bio_offset + bp->bio_length; 1501 /* Update loads. */ 1502 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1503 dp->load = (dp->d_consumer->index * LOAD_SCALE + 1504 dp->load * 7) / 8; 1505 } 1506 g_io_request(cbp, cp); 1507} 1508 1509static void 1510g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp) 1511{ 1512 struct bio_queue_head queue; 1513 struct g_mirror_disk *disk; 1514 struct g_consumer *cp; 1515 struct bio *cbp; 1516 off_t left, mod, offset, slice; 1517 u_char *data; 1518 u_int ndisks; 1519 1520 if (bp->bio_length <= sc->sc_slice) { 1521 g_mirror_request_round_robin(sc, bp); 1522 return; 1523 } 1524 ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE); 1525 slice = bp->bio_length / ndisks; 1526 mod = slice % sc->sc_provider->sectorsize; 1527 if (mod != 0) 1528 slice += sc->sc_provider->sectorsize - mod; 1529 /* 1530 * Allocate all bios before sending any request, so we can 1531 * return ENOMEM in nice and clean way. 1532 */ 1533 left = bp->bio_length; 1534 offset = bp->bio_offset; 1535 data = bp->bio_data; 1536 bioq_init(&queue); 1537 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1538 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1539 continue; 1540 cbp = g_clone_bio(bp); 1541 if (cbp == NULL) { 1542 for (cbp = bioq_first(&queue); cbp != NULL; 1543 cbp = bioq_first(&queue)) { 1544 bioq_remove(&queue, cbp); 1545 g_destroy_bio(cbp); 1546 } 1547 if (bp->bio_error == 0) 1548 bp->bio_error = ENOMEM; 1549 g_io_deliver(bp, bp->bio_error); 1550 return; 1551 } 1552 bioq_insert_tail(&queue, cbp); 1553 cbp->bio_done = g_mirror_done; 1554 cbp->bio_caller1 = disk; 1555 cbp->bio_to = disk->d_consumer->provider; 1556 cbp->bio_offset = offset; 1557 cbp->bio_data = data; 1558 cbp->bio_length = MIN(left, slice); 1559 left -= cbp->bio_length; 1560 if (left == 0) 1561 break; 1562 offset += cbp->bio_length; 1563 data += cbp->bio_length; 1564 } 1565 for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) { 1566 bioq_remove(&queue, cbp); 1567 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1568 disk = cbp->bio_caller1; 1569 cbp->bio_caller1 = NULL; 1570 cp = disk->d_consumer; 1571 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1572 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1573 cp->acr, cp->acw, cp->ace)); 1574 disk->d_consumer->index++; 1575 g_io_request(cbp, disk->d_consumer); 1576 } 1577} 1578 1579static void 1580g_mirror_register_request(struct bio *bp) 1581{ 1582 struct g_mirror_softc *sc; 1583 1584 sc = bp->bio_to->geom->softc; 1585 switch (bp->bio_cmd) { 1586 case BIO_READ: 1587 switch (sc->sc_balance) { 1588 case G_MIRROR_BALANCE_LOAD: 1589 g_mirror_request_load(sc, bp); 1590 break; 1591 case G_MIRROR_BALANCE_PREFER: 1592 g_mirror_request_prefer(sc, bp); 1593 break; 1594 case G_MIRROR_BALANCE_ROUND_ROBIN: 1595 g_mirror_request_round_robin(sc, bp); 1596 break; 1597 case G_MIRROR_BALANCE_SPLIT: 1598 g_mirror_request_split(sc, bp); 1599 break; 1600 } 1601 return; 1602 case BIO_WRITE: 1603 case BIO_DELETE: 1604 { 1605 struct g_mirror_disk *disk; 1606 struct g_mirror_disk_sync *sync; 1607 struct bio_queue_head queue; 1608 struct g_consumer *cp; 1609 struct bio *cbp; 1610 1611 /* 1612 * Delay the request if it is colliding with a synchronization 1613 * request. 1614 */ 1615 if (g_mirror_sync_collision(sc, bp)) { 1616 g_mirror_regular_delay(sc, bp); 1617 return; 1618 } 1619 1620 if (sc->sc_idle) 1621 g_mirror_unidle(sc); 1622 else 1623 sc->sc_last_write = time_uptime; 1624 1625 /* 1626 * Allocate all bios before sending any request, so we can 1627 * return ENOMEM in nice and clean way. 1628 */ 1629 bioq_init(&queue); 1630 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1631 sync = &disk->d_sync; 1632 switch (disk->d_state) { 1633 case G_MIRROR_DISK_STATE_ACTIVE: 1634 break; 1635 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 1636 if (bp->bio_offset >= sync->ds_offset) 1637 continue; 1638 break; 1639 default: 1640 continue; 1641 } 1642 if (bp->bio_cmd == BIO_DELETE && 1643 (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) == 0) 1644 continue; 1645 cbp = g_clone_bio(bp); 1646 if (cbp == NULL) { 1647 for (cbp = bioq_first(&queue); cbp != NULL; 1648 cbp = bioq_first(&queue)) { 1649 bioq_remove(&queue, cbp); 1650 g_destroy_bio(cbp); 1651 } 1652 if (bp->bio_error == 0) 1653 bp->bio_error = ENOMEM; 1654 g_io_deliver(bp, bp->bio_error); 1655 return; 1656 } 1657 bioq_insert_tail(&queue, cbp); 1658 cbp->bio_done = g_mirror_done; 1659 cp = disk->d_consumer; 1660 cbp->bio_caller1 = cp; 1661 cbp->bio_to = cp->provider; 1662 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1663 ("Consumer %s not opened (r%dw%de%d).", 1664 cp->provider->name, cp->acr, cp->acw, cp->ace)); 1665 } 1666 for (cbp = bioq_first(&queue); cbp != NULL; 1667 cbp = bioq_first(&queue)) { 1668 bioq_remove(&queue, cbp); 1669 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1670 cp = cbp->bio_caller1; 1671 cbp->bio_caller1 = NULL; 1672 cp->index++; 1673 sc->sc_writes++; 1674 g_io_request(cbp, cp); 1675 } 1676 /* 1677 * Put request onto inflight queue, so we can check if new 1678 * synchronization requests don't collide with it. 1679 */ 1680 bioq_insert_tail(&sc->sc_inflight, bp); 1681 /* 1682 * Bump syncid on first write. 1683 */ 1684 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) { 1685 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 1686 g_mirror_bump_syncid(sc); 1687 } 1688 return; 1689 } 1690 default: 1691 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1692 bp->bio_cmd, sc->sc_name)); 1693 break; 1694 } 1695} 1696 1697static int 1698g_mirror_can_destroy(struct g_mirror_softc *sc) 1699{ 1700 struct g_geom *gp; 1701 struct g_consumer *cp; 1702 1703 g_topology_assert(); 1704 gp = sc->sc_geom; 1705 if (gp->softc == NULL) 1706 return (1); 1707 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_TASTING) != 0) 1708 return (0); 1709 LIST_FOREACH(cp, &gp->consumer, consumer) { 1710 if (g_mirror_is_busy(sc, cp)) 1711 return (0); 1712 } 1713 gp = sc->sc_sync.ds_geom; 1714 LIST_FOREACH(cp, &gp->consumer, consumer) { 1715 if (g_mirror_is_busy(sc, cp)) 1716 return (0); 1717 } 1718 G_MIRROR_DEBUG(2, "No I/O requests for %s, it can be destroyed.", 1719 sc->sc_name); 1720 return (1); 1721} 1722 1723static int 1724g_mirror_try_destroy(struct g_mirror_softc *sc) 1725{ 1726 1727 if (sc->sc_rootmount != NULL) { 1728 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 1729 sc->sc_rootmount); 1730 root_mount_rel(sc->sc_rootmount); 1731 sc->sc_rootmount = NULL; 1732 } 1733 g_topology_lock(); 1734 if (!g_mirror_can_destroy(sc)) { 1735 g_topology_unlock(); 1736 return (0); 1737 } 1738 sc->sc_geom->softc = NULL; 1739 sc->sc_sync.ds_geom->softc = NULL; 1740 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WAIT) != 0) { 1741 g_topology_unlock(); 1742 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1743 &sc->sc_worker); 1744 /* Unlock sc_lock here, as it can be destroyed after wakeup. */ 1745 sx_xunlock(&sc->sc_lock); 1746 wakeup(&sc->sc_worker); 1747 sc->sc_worker = NULL; 1748 } else { 1749 g_topology_unlock(); 1750 g_mirror_destroy_device(sc); 1751 free(sc, M_MIRROR); 1752 } 1753 return (1); 1754} 1755 1756/* 1757 * Worker thread. 1758 */ 1759static void 1760g_mirror_worker(void *arg) 1761{ 1762 struct g_mirror_softc *sc; 1763 struct g_mirror_event *ep; 1764 struct bio *bp; 1765 int timeout; 1766 1767 sc = arg; 1768 thread_lock(curthread); 1769 sched_prio(curthread, PRIBIO); 1770 thread_unlock(curthread); 1771 1772 sx_xlock(&sc->sc_lock); 1773 for (;;) { 1774 G_MIRROR_DEBUG(5, "%s: Let's see...", __func__); 1775 /* 1776 * First take a look at events. 1777 * This is important to handle events before any I/O requests. 1778 */ 1779 ep = g_mirror_event_get(sc); 1780 if (ep != NULL) { 1781 g_mirror_event_remove(sc, ep); 1782 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) { 1783 /* Update only device status. */ 1784 G_MIRROR_DEBUG(3, 1785 "Running event for device %s.", 1786 sc->sc_name); 1787 ep->e_error = 0; 1788 g_mirror_update_device(sc, 1); 1789 } else { 1790 /* Update disk status. */ 1791 G_MIRROR_DEBUG(3, "Running event for disk %s.", 1792 g_mirror_get_diskname(ep->e_disk)); 1793 ep->e_error = g_mirror_update_disk(ep->e_disk, 1794 ep->e_state); 1795 if (ep->e_error == 0) 1796 g_mirror_update_device(sc, 0); 1797 } 1798 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) { 1799 KASSERT(ep->e_error == 0, 1800 ("Error cannot be handled.")); 1801 g_mirror_event_free(ep); 1802 } else { 1803 ep->e_flags |= G_MIRROR_EVENT_DONE; 1804 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1805 ep); 1806 mtx_lock(&sc->sc_events_mtx); 1807 wakeup(ep); 1808 mtx_unlock(&sc->sc_events_mtx); 1809 } 1810 if ((sc->sc_flags & 1811 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1812 if (g_mirror_try_destroy(sc)) { 1813 curthread->td_pflags &= ~TDP_GEOM; 1814 G_MIRROR_DEBUG(1, "Thread exiting."); 1815 kproc_exit(0); 1816 } 1817 } 1818 G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__); 1819 continue; 1820 } 1821 /* 1822 * Check if we can mark array as CLEAN and if we can't take 1823 * how much seconds should we wait. 1824 */ 1825 timeout = g_mirror_idle(sc, -1); 1826 /* 1827 * Now I/O requests. 1828 */ 1829 /* Get first request from the queue. */ 1830 mtx_lock(&sc->sc_queue_mtx); 1831 bp = bioq_first(&sc->sc_queue); 1832 if (bp == NULL) { 1833 if ((sc->sc_flags & 1834 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1835 mtx_unlock(&sc->sc_queue_mtx); 1836 if (g_mirror_try_destroy(sc)) { 1837 curthread->td_pflags &= ~TDP_GEOM; 1838 G_MIRROR_DEBUG(1, "Thread exiting."); 1839 kproc_exit(0); 1840 } 1841 mtx_lock(&sc->sc_queue_mtx); 1842 } 1843 sx_xunlock(&sc->sc_lock); 1844 /* 1845 * XXX: We can miss an event here, because an event 1846 * can be added without sx-device-lock and without 1847 * mtx-queue-lock. Maybe I should just stop using 1848 * dedicated mutex for events synchronization and 1849 * stick with the queue lock? 1850 * The event will hang here until next I/O request 1851 * or next event is received. 1852 */ 1853 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w1", 1854 timeout * hz); 1855 sx_xlock(&sc->sc_lock); 1856 G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__); 1857 continue; 1858 } 1859 bioq_remove(&sc->sc_queue, bp); 1860 mtx_unlock(&sc->sc_queue_mtx); 1861 1862 if (bp->bio_from->geom == sc->sc_sync.ds_geom && 1863 (bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) { 1864 g_mirror_sync_request(bp); /* READ */ 1865 } else if (bp->bio_to != sc->sc_provider) { 1866 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0) 1867 g_mirror_regular_request(bp); 1868 else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 1869 g_mirror_sync_request(bp); /* WRITE */ 1870 else { 1871 KASSERT(0, 1872 ("Invalid request cflags=0x%hhx to=%s.", 1873 bp->bio_cflags, bp->bio_to->name)); 1874 } 1875 } else { 1876 g_mirror_register_request(bp); 1877 } 1878 G_MIRROR_DEBUG(5, "%s: I'm here 9.", __func__); 1879 } 1880} 1881 1882static void 1883g_mirror_update_idle(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 1884{ 1885 1886 sx_assert(&sc->sc_lock, SX_LOCKED); 1887 1888 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 1889 return; 1890 if (!sc->sc_idle && (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) { 1891 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.", 1892 g_mirror_get_diskname(disk), sc->sc_name); 1893 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1894 } else if (sc->sc_idle && 1895 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 1896 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.", 1897 g_mirror_get_diskname(disk), sc->sc_name); 1898 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 1899 } 1900} 1901 1902static void 1903g_mirror_sync_start(struct g_mirror_disk *disk) 1904{ 1905 struct g_mirror_softc *sc; 1906 struct g_consumer *cp; 1907 struct bio *bp; 1908 int error, i; 1909 1910 g_topology_assert_not(); 1911 sc = disk->d_softc; 1912 sx_assert(&sc->sc_lock, SX_LOCKED); 1913 1914 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 1915 ("Disk %s is not marked for synchronization.", 1916 g_mirror_get_diskname(disk))); 1917 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1918 ("Device not in RUNNING state (%s, %u).", sc->sc_name, 1919 sc->sc_state)); 1920 1921 sx_xunlock(&sc->sc_lock); 1922 g_topology_lock(); 1923 cp = g_new_consumer(sc->sc_sync.ds_geom); 1924 error = g_attach(cp, sc->sc_provider); 1925 KASSERT(error == 0, 1926 ("Cannot attach to %s (error=%d).", sc->sc_name, error)); 1927 error = g_access(cp, 1, 0, 0); 1928 KASSERT(error == 0, ("Cannot open %s (error=%d).", sc->sc_name, error)); 1929 g_topology_unlock(); 1930 sx_xlock(&sc->sc_lock); 1931 1932 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name, 1933 g_mirror_get_diskname(disk)); 1934 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) == 0) 1935 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1936 KASSERT(disk->d_sync.ds_consumer == NULL, 1937 ("Sync consumer already exists (device=%s, disk=%s).", 1938 sc->sc_name, g_mirror_get_diskname(disk))); 1939 1940 disk->d_sync.ds_consumer = cp; 1941 disk->d_sync.ds_consumer->private = disk; 1942 disk->d_sync.ds_consumer->index = 0; 1943 1944 /* 1945 * Allocate memory for synchronization bios and initialize them. 1946 */ 1947 disk->d_sync.ds_bios = malloc(sizeof(struct bio *) * g_mirror_syncreqs, 1948 M_MIRROR, M_WAITOK); 1949 for (i = 0; i < g_mirror_syncreqs; i++) { 1950 bp = g_alloc_bio(); 1951 disk->d_sync.ds_bios[i] = bp; 1952 bp->bio_parent = NULL; 1953 bp->bio_cmd = BIO_READ; 1954 bp->bio_data = malloc(MAXPHYS, M_MIRROR, M_WAITOK); 1955 bp->bio_cflags = 0; 1956 bp->bio_offset = disk->d_sync.ds_offset; 1957 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset); 1958 disk->d_sync.ds_offset += bp->bio_length; 1959 bp->bio_done = g_mirror_sync_done; 1960 bp->bio_from = disk->d_sync.ds_consumer; 1961 bp->bio_to = sc->sc_provider; 1962 bp->bio_caller1 = (void *)(uintptr_t)i; 1963 } 1964 1965 /* Increase the number of disks in SYNCHRONIZING state. */ 1966 sc->sc_sync.ds_ndisks++; 1967 /* Set the number of in-flight synchronization requests. */ 1968 disk->d_sync.ds_inflight = g_mirror_syncreqs; 1969 1970 /* 1971 * Fire off first synchronization requests. 1972 */ 1973 for (i = 0; i < g_mirror_syncreqs; i++) { 1974 bp = disk->d_sync.ds_bios[i]; 1975 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 1976 disk->d_sync.ds_consumer->index++; 1977 /* 1978 * Delay the request if it is colliding with a regular request. 1979 */ 1980 if (g_mirror_regular_collision(sc, bp)) 1981 g_mirror_sync_delay(sc, bp); 1982 else 1983 g_io_request(bp, disk->d_sync.ds_consumer); 1984 } 1985} 1986 1987/* 1988 * Stop synchronization process. 1989 * type: 0 - synchronization finished 1990 * 1 - synchronization stopped 1991 */ 1992static void 1993g_mirror_sync_stop(struct g_mirror_disk *disk, int type) 1994{ 1995 struct g_mirror_softc *sc; 1996 struct g_consumer *cp; 1997 1998 g_topology_assert_not(); 1999 sc = disk->d_softc; 2000 sx_assert(&sc->sc_lock, SX_LOCKED); 2001 2002 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2003 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2004 g_mirror_disk_state2str(disk->d_state))); 2005 if (disk->d_sync.ds_consumer == NULL) 2006 return; 2007 2008 if (type == 0) { 2009 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.", 2010 sc->sc_name, g_mirror_get_diskname(disk)); 2011 } else /* if (type == 1) */ { 2012 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.", 2013 sc->sc_name, g_mirror_get_diskname(disk)); 2014 } 2015 free(disk->d_sync.ds_bios, M_MIRROR); 2016 disk->d_sync.ds_bios = NULL; 2017 cp = disk->d_sync.ds_consumer; 2018 disk->d_sync.ds_consumer = NULL; 2019 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2020 sc->sc_sync.ds_ndisks--; 2021 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 2022 g_topology_lock(); 2023 g_mirror_kill_consumer(sc, cp); 2024 g_topology_unlock(); 2025 sx_xlock(&sc->sc_lock); 2026} 2027 2028static void 2029g_mirror_launch_provider(struct g_mirror_softc *sc) 2030{ 2031 struct g_mirror_disk *disk; 2032 struct g_provider *pp; 2033 2034 sx_assert(&sc->sc_lock, SX_LOCKED); 2035 2036 g_topology_lock(); 2037 pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name); 2038 pp->mediasize = sc->sc_mediasize; 2039 pp->sectorsize = sc->sc_sectorsize; 2040 pp->stripesize = 0; 2041 pp->stripeoffset = 0; 2042 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2043 if (disk->d_consumer && disk->d_consumer->provider && 2044 disk->d_consumer->provider->stripesize > pp->stripesize) { 2045 pp->stripesize = disk->d_consumer->provider->stripesize; 2046 pp->stripeoffset = disk->d_consumer->provider->stripeoffset; 2047 } 2048 } 2049 sc->sc_provider = pp; 2050 g_error_provider(pp, 0); 2051 g_topology_unlock(); 2052 G_MIRROR_DEBUG(0, "Device %s launched (%u/%u).", pp->name, 2053 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE), sc->sc_ndisks); 2054 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2055 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2056 g_mirror_sync_start(disk); 2057 } 2058} 2059 2060static void 2061g_mirror_destroy_provider(struct g_mirror_softc *sc) 2062{ 2063 struct g_mirror_disk *disk; 2064 struct bio *bp; 2065 2066 g_topology_assert_not(); 2067 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).", 2068 sc->sc_name)); 2069 2070 g_topology_lock(); 2071 g_error_provider(sc->sc_provider, ENXIO); 2072 mtx_lock(&sc->sc_queue_mtx); 2073 while ((bp = bioq_first(&sc->sc_queue)) != NULL) { 2074 bioq_remove(&sc->sc_queue, bp); 2075 g_io_deliver(bp, ENXIO); 2076 } 2077 mtx_unlock(&sc->sc_queue_mtx); 2078 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", sc->sc_name, 2079 sc->sc_provider->name); 2080 sc->sc_provider->flags |= G_PF_WITHER; 2081 g_orphan_provider(sc->sc_provider, ENXIO); 2082 g_topology_unlock(); 2083 sc->sc_provider = NULL; 2084 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2085 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2086 g_mirror_sync_stop(disk, 1); 2087 } 2088} 2089 2090static void 2091g_mirror_go(void *arg) 2092{ 2093 struct g_mirror_softc *sc; 2094 2095 sc = arg; 2096 G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name); 2097 g_mirror_event_send(sc, 0, 2098 G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE); 2099} 2100 2101static u_int 2102g_mirror_determine_state(struct g_mirror_disk *disk) 2103{ 2104 struct g_mirror_softc *sc; 2105 u_int state; 2106 2107 sc = disk->d_softc; 2108 if (sc->sc_syncid == disk->d_sync.ds_syncid) { 2109 if ((disk->d_flags & 2110 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2111 /* Disk does not need synchronization. */ 2112 state = G_MIRROR_DISK_STATE_ACTIVE; 2113 } else { 2114 if ((sc->sc_flags & 2115 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2116 (disk->d_flags & 2117 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2118 /* 2119 * We can start synchronization from 2120 * the stored offset. 2121 */ 2122 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2123 } else { 2124 state = G_MIRROR_DISK_STATE_STALE; 2125 } 2126 } 2127 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) { 2128 /* 2129 * Reset all synchronization data for this disk, 2130 * because if it even was synchronized, it was 2131 * synchronized to disks with different syncid. 2132 */ 2133 disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2134 disk->d_sync.ds_offset = 0; 2135 disk->d_sync.ds_offset_done = 0; 2136 disk->d_sync.ds_syncid = sc->sc_syncid; 2137 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2138 (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2139 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2140 } else { 2141 state = G_MIRROR_DISK_STATE_STALE; 2142 } 2143 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ { 2144 /* 2145 * Not good, NOT GOOD! 2146 * It means that mirror was started on stale disks 2147 * and more fresh disk just arrive. 2148 * If there were writes, mirror is broken, sorry. 2149 * I think the best choice here is don't touch 2150 * this disk and inform the user loudly. 2151 */ 2152 G_MIRROR_DEBUG(0, "Device %s was started before the freshest " 2153 "disk (%s) arrives!! It will not be connected to the " 2154 "running device.", sc->sc_name, 2155 g_mirror_get_diskname(disk)); 2156 g_mirror_destroy_disk(disk); 2157 state = G_MIRROR_DISK_STATE_NONE; 2158 /* Return immediately, because disk was destroyed. */ 2159 return (state); 2160 } 2161 G_MIRROR_DEBUG(3, "State for %s disk: %s.", 2162 g_mirror_get_diskname(disk), g_mirror_disk_state2str(state)); 2163 return (state); 2164} 2165 2166/* 2167 * Update device state. 2168 */ 2169static void 2170g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force) 2171{ 2172 struct g_mirror_disk *disk; 2173 u_int state; 2174 2175 sx_assert(&sc->sc_lock, SX_XLOCKED); 2176 2177 switch (sc->sc_state) { 2178 case G_MIRROR_DEVICE_STATE_STARTING: 2179 { 2180 struct g_mirror_disk *pdisk, *tdisk; 2181 u_int dirty, ndisks, genid, syncid; 2182 2183 KASSERT(sc->sc_provider == NULL, 2184 ("Non-NULL provider in STARTING state (%s).", sc->sc_name)); 2185 /* 2186 * Are we ready? We are, if all disks are connected or 2187 * if we have any disks and 'force' is true. 2188 */ 2189 ndisks = g_mirror_ndisks(sc, -1); 2190 if (sc->sc_ndisks == ndisks || (force && ndisks > 0)) { 2191 ; 2192 } else if (ndisks == 0) { 2193 /* 2194 * Disks went down in starting phase, so destroy 2195 * device. 2196 */ 2197 callout_drain(&sc->sc_callout); 2198 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2199 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 2200 sc->sc_rootmount); 2201 root_mount_rel(sc->sc_rootmount); 2202 sc->sc_rootmount = NULL; 2203 return; 2204 } else { 2205 return; 2206 } 2207 2208 /* 2209 * Activate all disks with the biggest syncid. 2210 */ 2211 if (force) { 2212 /* 2213 * If 'force' is true, we have been called due to 2214 * timeout, so don't bother canceling timeout. 2215 */ 2216 ndisks = 0; 2217 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2218 if ((disk->d_flags & 2219 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2220 ndisks++; 2221 } 2222 } 2223 if (ndisks == 0) { 2224 /* No valid disks found, destroy device. */ 2225 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2226 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2227 __LINE__, sc->sc_rootmount); 2228 root_mount_rel(sc->sc_rootmount); 2229 sc->sc_rootmount = NULL; 2230 return; 2231 } 2232 } else { 2233 /* Cancel timeout. */ 2234 callout_drain(&sc->sc_callout); 2235 } 2236 2237 /* 2238 * Find the biggest genid. 2239 */ 2240 genid = 0; 2241 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2242 if (disk->d_genid > genid) 2243 genid = disk->d_genid; 2244 } 2245 sc->sc_genid = genid; 2246 /* 2247 * Remove all disks without the biggest genid. 2248 */ 2249 LIST_FOREACH_SAFE(disk, &sc->sc_disks, d_next, tdisk) { 2250 if (disk->d_genid < genid) { 2251 G_MIRROR_DEBUG(0, 2252 "Component %s (device %s) broken, skipping.", 2253 g_mirror_get_diskname(disk), sc->sc_name); 2254 g_mirror_destroy_disk(disk); 2255 } 2256 } 2257 2258 /* 2259 * Find the biggest syncid. 2260 */ 2261 syncid = 0; 2262 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2263 if (disk->d_sync.ds_syncid > syncid) 2264 syncid = disk->d_sync.ds_syncid; 2265 } 2266 2267 /* 2268 * Here we need to look for dirty disks and if all disks 2269 * with the biggest syncid are dirty, we have to choose 2270 * one with the biggest priority and rebuild the rest. 2271 */ 2272 /* 2273 * Find the number of dirty disks with the biggest syncid. 2274 * Find the number of disks with the biggest syncid. 2275 * While here, find a disk with the biggest priority. 2276 */ 2277 dirty = ndisks = 0; 2278 pdisk = NULL; 2279 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2280 if (disk->d_sync.ds_syncid != syncid) 2281 continue; 2282 if ((disk->d_flags & 2283 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2284 continue; 2285 } 2286 ndisks++; 2287 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 2288 dirty++; 2289 if (pdisk == NULL || 2290 pdisk->d_priority < disk->d_priority) { 2291 pdisk = disk; 2292 } 2293 } 2294 } 2295 if (dirty == 0) { 2296 /* No dirty disks at all, great. */ 2297 } else if (dirty == ndisks) { 2298 /* 2299 * Force synchronization for all dirty disks except one 2300 * with the biggest priority. 2301 */ 2302 KASSERT(pdisk != NULL, ("pdisk == NULL")); 2303 G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a " 2304 "master disk for synchronization.", 2305 g_mirror_get_diskname(pdisk), sc->sc_name); 2306 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2307 if (disk->d_sync.ds_syncid != syncid) 2308 continue; 2309 if ((disk->d_flags & 2310 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2311 continue; 2312 } 2313 KASSERT((disk->d_flags & 2314 G_MIRROR_DISK_FLAG_DIRTY) != 0, 2315 ("Disk %s isn't marked as dirty.", 2316 g_mirror_get_diskname(disk))); 2317 /* Skip the disk with the biggest priority. */ 2318 if (disk == pdisk) 2319 continue; 2320 disk->d_sync.ds_syncid = 0; 2321 } 2322 } else if (dirty < ndisks) { 2323 /* 2324 * Force synchronization for all dirty disks. 2325 * We have some non-dirty disks. 2326 */ 2327 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2328 if (disk->d_sync.ds_syncid != syncid) 2329 continue; 2330 if ((disk->d_flags & 2331 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2332 continue; 2333 } 2334 if ((disk->d_flags & 2335 G_MIRROR_DISK_FLAG_DIRTY) == 0) { 2336 continue; 2337 } 2338 disk->d_sync.ds_syncid = 0; 2339 } 2340 } 2341 2342 /* Reset hint. */ 2343 sc->sc_hint = NULL; 2344 sc->sc_syncid = syncid; 2345 if (force) { 2346 /* Remember to bump syncid on first write. */ 2347 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2348 } 2349 state = G_MIRROR_DEVICE_STATE_RUNNING; 2350 G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.", 2351 sc->sc_name, g_mirror_device_state2str(sc->sc_state), 2352 g_mirror_device_state2str(state)); 2353 sc->sc_state = state; 2354 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2355 state = g_mirror_determine_state(disk); 2356 g_mirror_event_send(disk, state, 2357 G_MIRROR_EVENT_DONTWAIT); 2358 if (state == G_MIRROR_DISK_STATE_STALE) 2359 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2360 } 2361 break; 2362 } 2363 case G_MIRROR_DEVICE_STATE_RUNNING: 2364 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 && 2365 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2366 /* 2367 * No active disks or no disks at all, 2368 * so destroy device. 2369 */ 2370 if (sc->sc_provider != NULL) 2371 g_mirror_destroy_provider(sc); 2372 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2373 break; 2374 } else if (g_mirror_ndisks(sc, 2375 G_MIRROR_DISK_STATE_ACTIVE) > 0 && 2376 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2377 /* 2378 * We have active disks, launch provider if it doesn't 2379 * exist. 2380 */ 2381 if (sc->sc_provider == NULL) 2382 g_mirror_launch_provider(sc); 2383 if (sc->sc_rootmount != NULL) { 2384 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2385 __LINE__, sc->sc_rootmount); 2386 root_mount_rel(sc->sc_rootmount); 2387 sc->sc_rootmount = NULL; 2388 } 2389 } 2390 /* 2391 * Genid should be bumped immediately, so do it here. 2392 */ 2393 if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID) != 0) { 2394 sc->sc_bump_id &= ~G_MIRROR_BUMP_GENID; 2395 g_mirror_bump_genid(sc); 2396 } 2397 break; 2398 default: 2399 KASSERT(1 == 0, ("Wrong device state (%s, %s).", 2400 sc->sc_name, g_mirror_device_state2str(sc->sc_state))); 2401 break; 2402 } 2403} 2404 2405/* 2406 * Update disk state and device state if needed. 2407 */ 2408#define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \ 2409 "Disk %s state changed from %s to %s (device %s).", \ 2410 g_mirror_get_diskname(disk), \ 2411 g_mirror_disk_state2str(disk->d_state), \ 2412 g_mirror_disk_state2str(state), sc->sc_name) 2413static int 2414g_mirror_update_disk(struct g_mirror_disk *disk, u_int state) 2415{ 2416 struct g_mirror_softc *sc; 2417 2418 sc = disk->d_softc; 2419 sx_assert(&sc->sc_lock, SX_XLOCKED); 2420 2421again: 2422 G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.", 2423 g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state), 2424 g_mirror_disk_state2str(state)); 2425 switch (state) { 2426 case G_MIRROR_DISK_STATE_NEW: 2427 /* 2428 * Possible scenarios: 2429 * 1. New disk arrive. 2430 */ 2431 /* Previous state should be NONE. */ 2432 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE, 2433 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2434 g_mirror_disk_state2str(disk->d_state))); 2435 DISK_STATE_CHANGED(); 2436 2437 disk->d_state = state; 2438 if (LIST_EMPTY(&sc->sc_disks)) 2439 LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next); 2440 else { 2441 struct g_mirror_disk *dp; 2442 2443 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 2444 if (disk->d_priority >= dp->d_priority) { 2445 LIST_INSERT_BEFORE(dp, disk, d_next); 2446 dp = NULL; 2447 break; 2448 } 2449 if (LIST_NEXT(dp, d_next) == NULL) 2450 break; 2451 } 2452 if (dp != NULL) 2453 LIST_INSERT_AFTER(dp, disk, d_next); 2454 } 2455 G_MIRROR_DEBUG(1, "Device %s: provider %s detected.", 2456 sc->sc_name, g_mirror_get_diskname(disk)); 2457 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 2458 break; 2459 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2460 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2461 g_mirror_device_state2str(sc->sc_state), 2462 g_mirror_get_diskname(disk), 2463 g_mirror_disk_state2str(disk->d_state))); 2464 state = g_mirror_determine_state(disk); 2465 if (state != G_MIRROR_DISK_STATE_NONE) 2466 goto again; 2467 break; 2468 case G_MIRROR_DISK_STATE_ACTIVE: 2469 /* 2470 * Possible scenarios: 2471 * 1. New disk does not need synchronization. 2472 * 2. Synchronization process finished successfully. 2473 */ 2474 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2475 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2476 g_mirror_device_state2str(sc->sc_state), 2477 g_mirror_get_diskname(disk), 2478 g_mirror_disk_state2str(disk->d_state))); 2479 /* Previous state should be NEW or SYNCHRONIZING. */ 2480 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW || 2481 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2482 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2483 g_mirror_disk_state2str(disk->d_state))); 2484 DISK_STATE_CHANGED(); 2485 2486 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2487 disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2488 disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC; 2489 g_mirror_sync_stop(disk, 0); 2490 } 2491 disk->d_state = state; 2492 disk->d_sync.ds_offset = 0; 2493 disk->d_sync.ds_offset_done = 0; 2494 g_mirror_update_idle(sc, disk); 2495 g_mirror_update_metadata(disk); 2496 G_MIRROR_DEBUG(1, "Device %s: provider %s activated.", 2497 sc->sc_name, g_mirror_get_diskname(disk)); 2498 break; 2499 case G_MIRROR_DISK_STATE_STALE: 2500 /* 2501 * Possible scenarios: 2502 * 1. Stale disk was connected. 2503 */ 2504 /* Previous state should be NEW. */ 2505 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2506 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2507 g_mirror_disk_state2str(disk->d_state))); 2508 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2509 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2510 g_mirror_device_state2str(sc->sc_state), 2511 g_mirror_get_diskname(disk), 2512 g_mirror_disk_state2str(disk->d_state))); 2513 /* 2514 * STALE state is only possible if device is marked 2515 * NOAUTOSYNC. 2516 */ 2517 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0, 2518 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2519 g_mirror_device_state2str(sc->sc_state), 2520 g_mirror_get_diskname(disk), 2521 g_mirror_disk_state2str(disk->d_state))); 2522 DISK_STATE_CHANGED(); 2523 2524 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2525 disk->d_state = state; 2526 g_mirror_update_metadata(disk); 2527 G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.", 2528 sc->sc_name, g_mirror_get_diskname(disk)); 2529 break; 2530 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 2531 /* 2532 * Possible scenarios: 2533 * 1. Disk which needs synchronization was connected. 2534 */ 2535 /* Previous state should be NEW. */ 2536 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2537 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2538 g_mirror_disk_state2str(disk->d_state))); 2539 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2540 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2541 g_mirror_device_state2str(sc->sc_state), 2542 g_mirror_get_diskname(disk), 2543 g_mirror_disk_state2str(disk->d_state))); 2544 DISK_STATE_CHANGED(); 2545 2546 if (disk->d_state == G_MIRROR_DISK_STATE_NEW) 2547 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2548 disk->d_state = state; 2549 if (sc->sc_provider != NULL) { 2550 g_mirror_sync_start(disk); 2551 g_mirror_update_metadata(disk); 2552 } 2553 break; 2554 case G_MIRROR_DISK_STATE_DISCONNECTED: 2555 /* 2556 * Possible scenarios: 2557 * 1. Device wasn't running yet, but disk disappear. 2558 * 2. Disk was active and disapppear. 2559 * 3. Disk disappear during synchronization process. 2560 */ 2561 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) { 2562 /* 2563 * Previous state should be ACTIVE, STALE or 2564 * SYNCHRONIZING. 2565 */ 2566 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 2567 disk->d_state == G_MIRROR_DISK_STATE_STALE || 2568 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2569 ("Wrong disk state (%s, %s).", 2570 g_mirror_get_diskname(disk), 2571 g_mirror_disk_state2str(disk->d_state))); 2572 } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) { 2573 /* Previous state should be NEW. */ 2574 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2575 ("Wrong disk state (%s, %s).", 2576 g_mirror_get_diskname(disk), 2577 g_mirror_disk_state2str(disk->d_state))); 2578 /* 2579 * Reset bumping syncid if disk disappeared in STARTING 2580 * state. 2581 */ 2582 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) 2583 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 2584#ifdef INVARIANTS 2585 } else { 2586 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).", 2587 sc->sc_name, 2588 g_mirror_device_state2str(sc->sc_state), 2589 g_mirror_get_diskname(disk), 2590 g_mirror_disk_state2str(disk->d_state))); 2591#endif 2592 } 2593 DISK_STATE_CHANGED(); 2594 G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.", 2595 sc->sc_name, g_mirror_get_diskname(disk)); 2596 2597 g_mirror_destroy_disk(disk); 2598 break; 2599 case G_MIRROR_DISK_STATE_DESTROY: 2600 { 2601 int error; 2602 2603 error = g_mirror_clear_metadata(disk); 2604 if (error != 0) 2605 return (error); 2606 DISK_STATE_CHANGED(); 2607 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", 2608 sc->sc_name, g_mirror_get_diskname(disk)); 2609 2610 g_mirror_destroy_disk(disk); 2611 sc->sc_ndisks--; 2612 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2613 g_mirror_update_metadata(disk); 2614 } 2615 break; 2616 } 2617 default: 2618 KASSERT(1 == 0, ("Unknown state (%u).", state)); 2619 break; 2620 } 2621 return (0); 2622} 2623#undef DISK_STATE_CHANGED 2624 2625int 2626g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md) 2627{ 2628 struct g_provider *pp; 2629 u_char *buf; 2630 int error; 2631 2632 g_topology_assert(); 2633 2634 error = g_access(cp, 1, 0, 0); 2635 if (error != 0) 2636 return (error); 2637 pp = cp->provider; 2638 g_topology_unlock(); 2639 /* Metadata are stored on last sector. */ 2640 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 2641 &error); 2642 g_topology_lock(); 2643 g_access(cp, -1, 0, 0); 2644 if (buf == NULL) { 2645 G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).", 2646 cp->provider->name, error); 2647 return (error); 2648 } 2649 2650 /* Decode metadata. */ 2651 error = mirror_metadata_decode(buf, md); 2652 g_free(buf); 2653 if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0) 2654 return (EINVAL); 2655 if (md->md_version > G_MIRROR_VERSION) { 2656 G_MIRROR_DEBUG(0, 2657 "Kernel module is too old to handle metadata from %s.", 2658 cp->provider->name); 2659 return (EINVAL); 2660 } 2661 if (error != 0) { 2662 G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.", 2663 cp->provider->name); 2664 return (error); 2665 } 2666 2667 return (0); 2668} 2669 2670static int 2671g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp, 2672 struct g_mirror_metadata *md) 2673{ 2674 2675 if (g_mirror_id2disk(sc, md->md_did) != NULL) { 2676 G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.", 2677 pp->name, md->md_did); 2678 return (EEXIST); 2679 } 2680 if (md->md_all != sc->sc_ndisks) { 2681 G_MIRROR_DEBUG(1, 2682 "Invalid '%s' field on disk %s (device %s), skipping.", 2683 "md_all", pp->name, sc->sc_name); 2684 return (EINVAL); 2685 } 2686 if (md->md_slice != sc->sc_slice) { 2687 G_MIRROR_DEBUG(1, 2688 "Invalid '%s' field on disk %s (device %s), skipping.", 2689 "md_slice", pp->name, sc->sc_name); 2690 return (EINVAL); 2691 } 2692 if (md->md_balance != sc->sc_balance) { 2693 G_MIRROR_DEBUG(1, 2694 "Invalid '%s' field on disk %s (device %s), skipping.", 2695 "md_balance", pp->name, sc->sc_name); 2696 return (EINVAL); 2697 } 2698 if (md->md_mediasize != sc->sc_mediasize) { 2699 G_MIRROR_DEBUG(1, 2700 "Invalid '%s' field on disk %s (device %s), skipping.", 2701 "md_mediasize", pp->name, sc->sc_name); 2702 return (EINVAL); 2703 } 2704 if (sc->sc_mediasize > pp->mediasize) { 2705 G_MIRROR_DEBUG(1, 2706 "Invalid size of disk %s (device %s), skipping.", pp->name, 2707 sc->sc_name); 2708 return (EINVAL); 2709 } 2710 if (md->md_sectorsize != sc->sc_sectorsize) { 2711 G_MIRROR_DEBUG(1, 2712 "Invalid '%s' field on disk %s (device %s), skipping.", 2713 "md_sectorsize", pp->name, sc->sc_name); 2714 return (EINVAL); 2715 } 2716 if ((sc->sc_sectorsize % pp->sectorsize) != 0) { 2717 G_MIRROR_DEBUG(1, 2718 "Invalid sector size of disk %s (device %s), skipping.", 2719 pp->name, sc->sc_name); 2720 return (EINVAL); 2721 } 2722 if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) { 2723 G_MIRROR_DEBUG(1, 2724 "Invalid device flags on disk %s (device %s), skipping.", 2725 pp->name, sc->sc_name); 2726 return (EINVAL); 2727 } 2728 if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) { 2729 G_MIRROR_DEBUG(1, 2730 "Invalid disk flags on disk %s (device %s), skipping.", 2731 pp->name, sc->sc_name); 2732 return (EINVAL); 2733 } 2734 return (0); 2735} 2736 2737int 2738g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp, 2739 struct g_mirror_metadata *md) 2740{ 2741 struct g_mirror_disk *disk; 2742 int error; 2743 2744 g_topology_assert_not(); 2745 G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name); 2746 2747 error = g_mirror_check_metadata(sc, pp, md); 2748 if (error != 0) 2749 return (error); 2750 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING && 2751 md->md_genid < sc->sc_genid) { 2752 G_MIRROR_DEBUG(0, "Component %s (device %s) broken, skipping.", 2753 pp->name, sc->sc_name); 2754 return (EINVAL); 2755 } 2756 disk = g_mirror_init_disk(sc, pp, md, &error); 2757 if (disk == NULL) 2758 return (error); 2759 error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW, 2760 G_MIRROR_EVENT_WAIT); 2761 if (error != 0) 2762 return (error); 2763 if (md->md_version < G_MIRROR_VERSION) { 2764 G_MIRROR_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).", 2765 pp->name, md->md_version, G_MIRROR_VERSION); 2766 g_mirror_update_metadata(disk); 2767 } 2768 return (0); 2769} 2770 2771static void 2772g_mirror_destroy_delayed(void *arg, int flag) 2773{ 2774 struct g_mirror_softc *sc; 2775 int error; 2776 2777 if (flag == EV_CANCEL) { 2778 G_MIRROR_DEBUG(1, "Destroying canceled."); 2779 return; 2780 } 2781 sc = arg; 2782 g_topology_unlock(); 2783 sx_xlock(&sc->sc_lock); 2784 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) == 0, 2785 ("DESTROY flag set on %s.", sc->sc_name)); 2786 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0, 2787 ("DESTROYING flag not set on %s.", sc->sc_name)); 2788 G_MIRROR_DEBUG(1, "Destroying %s (delayed).", sc->sc_name); 2789 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_SOFT); 2790 if (error != 0) { 2791 G_MIRROR_DEBUG(0, "Cannot destroy %s.", sc->sc_name); 2792 sx_xunlock(&sc->sc_lock); 2793 } 2794 g_topology_lock(); 2795} 2796 2797static int 2798g_mirror_access(struct g_provider *pp, int acr, int acw, int ace) 2799{ 2800 struct g_mirror_softc *sc; 2801 int dcr, dcw, dce, error = 0; 2802 2803 g_topology_assert(); 2804 G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr, 2805 acw, ace); 2806 2807 sc = pp->geom->softc; 2808 if (sc == NULL && acr <= 0 && acw <= 0 && ace <= 0) 2809 return (0); 2810 KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name)); 2811 2812 dcr = pp->acr + acr; 2813 dcw = pp->acw + acw; 2814 dce = pp->ace + ace; 2815 2816 g_topology_unlock(); 2817 sx_xlock(&sc->sc_lock); 2818 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0 || 2819 LIST_EMPTY(&sc->sc_disks)) { 2820 if (acr > 0 || acw > 0 || ace > 0) 2821 error = ENXIO; 2822 goto end; 2823 } 2824 if (dcw == 0 && !sc->sc_idle) 2825 g_mirror_idle(sc, dcw); 2826 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0) { 2827 if (acr > 0 || acw > 0 || ace > 0) { 2828 error = ENXIO; 2829 goto end; 2830 } 2831 if (dcr == 0 && dcw == 0 && dce == 0) { 2832 g_post_event(g_mirror_destroy_delayed, sc, M_WAITOK, 2833 sc, NULL); 2834 } 2835 } 2836end: 2837 sx_xunlock(&sc->sc_lock); 2838 g_topology_lock(); 2839 return (error); 2840} 2841 2842static struct g_geom * 2843g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md) 2844{ 2845 struct g_mirror_softc *sc; 2846 struct g_geom *gp; 2847 int error, timeout; 2848 2849 g_topology_assert(); 2850 G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name, 2851 md->md_mid); 2852 2853 /* One disk is minimum. */ 2854 if (md->md_all < 1) 2855 return (NULL); 2856 /* 2857 * Action geom. 2858 */ 2859 gp = g_new_geomf(mp, "%s", md->md_name); 2860 sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO); 2861 gp->start = g_mirror_start; 2862 gp->orphan = g_mirror_orphan; 2863 gp->access = g_mirror_access; 2864 gp->dumpconf = g_mirror_dumpconf; 2865 2866 sc->sc_id = md->md_mid; 2867 sc->sc_slice = md->md_slice; 2868 sc->sc_balance = md->md_balance; 2869 sc->sc_mediasize = md->md_mediasize; 2870 sc->sc_sectorsize = md->md_sectorsize; 2871 sc->sc_ndisks = md->md_all; 2872 sc->sc_flags = md->md_mflags; 2873 sc->sc_bump_id = 0; 2874 sc->sc_idle = 1; 2875 sc->sc_last_write = time_uptime; 2876 sc->sc_writes = 0; 2877 sx_init(&sc->sc_lock, "gmirror:lock"); 2878 bioq_init(&sc->sc_queue); 2879 mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF); 2880 bioq_init(&sc->sc_regular_delayed); 2881 bioq_init(&sc->sc_inflight); 2882 bioq_init(&sc->sc_sync_delayed); 2883 LIST_INIT(&sc->sc_disks); 2884 TAILQ_INIT(&sc->sc_events); 2885 mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF); 2886 callout_init(&sc->sc_callout, CALLOUT_MPSAFE); 2887 sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING; 2888 gp->softc = sc; 2889 sc->sc_geom = gp; 2890 sc->sc_provider = NULL; 2891 /* 2892 * Synchronization geom. 2893 */ 2894 gp = g_new_geomf(mp, "%s.sync", md->md_name); 2895 gp->softc = sc; 2896 gp->orphan = g_mirror_orphan; 2897 sc->sc_sync.ds_geom = gp; 2898 sc->sc_sync.ds_ndisks = 0; 2899 error = kproc_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0, 2900 "g_mirror %s", md->md_name); 2901 if (error != 0) { 2902 G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.", 2903 sc->sc_name); 2904 g_destroy_geom(sc->sc_sync.ds_geom); 2905 mtx_destroy(&sc->sc_events_mtx); 2906 mtx_destroy(&sc->sc_queue_mtx); 2907 sx_destroy(&sc->sc_lock); 2908 g_destroy_geom(sc->sc_geom); 2909 free(sc, M_MIRROR); 2910 return (NULL); 2911 } 2912 2913 G_MIRROR_DEBUG(1, "Device %s created (%u components, id=%u).", 2914 sc->sc_name, sc->sc_ndisks, sc->sc_id); 2915 2916 sc->sc_rootmount = root_mount_hold("GMIRROR"); 2917 G_MIRROR_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount); 2918 /* 2919 * Run timeout. 2920 */ 2921 timeout = g_mirror_timeout * hz; 2922 callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc); 2923 return (sc->sc_geom); 2924} 2925 2926int 2927g_mirror_destroy(struct g_mirror_softc *sc, int how) 2928{ 2929 struct g_mirror_disk *disk; 2930 struct g_provider *pp; 2931 2932 g_topology_assert_not(); 2933 if (sc == NULL) 2934 return (ENXIO); 2935 sx_assert(&sc->sc_lock, SX_XLOCKED); 2936 2937 pp = sc->sc_provider; 2938 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 2939 switch (how) { 2940 case G_MIRROR_DESTROY_SOFT: 2941 G_MIRROR_DEBUG(1, 2942 "Device %s is still open (r%dw%de%d).", pp->name, 2943 pp->acr, pp->acw, pp->ace); 2944 return (EBUSY); 2945 case G_MIRROR_DESTROY_DELAYED: 2946 G_MIRROR_DEBUG(1, 2947 "Device %s will be destroyed on last close.", 2948 pp->name); 2949 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2950 if (disk->d_state == 2951 G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2952 g_mirror_sync_stop(disk, 1); 2953 } 2954 } 2955 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROYING; 2956 return (EBUSY); 2957 case G_MIRROR_DESTROY_HARD: 2958 G_MIRROR_DEBUG(1, "Device %s is still open, so it " 2959 "can't be definitely removed.", pp->name); 2960 } 2961 } 2962 2963 g_topology_lock(); 2964 if (sc->sc_geom->softc == NULL) { 2965 g_topology_unlock(); 2966 return (0); 2967 } 2968 sc->sc_geom->softc = NULL; 2969 sc->sc_sync.ds_geom->softc = NULL; 2970 g_topology_unlock(); 2971 2972 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2973 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_WAIT; 2974 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 2975 sx_xunlock(&sc->sc_lock); 2976 mtx_lock(&sc->sc_queue_mtx); 2977 wakeup(sc); 2978 mtx_unlock(&sc->sc_queue_mtx); 2979 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker); 2980 while (sc->sc_worker != NULL) 2981 tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5); 2982 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker); 2983 sx_xlock(&sc->sc_lock); 2984 g_mirror_destroy_device(sc); 2985 free(sc, M_MIRROR); 2986 return (0); 2987} 2988 2989static void 2990g_mirror_taste_orphan(struct g_consumer *cp) 2991{ 2992 2993 KASSERT(1 == 0, ("%s called while tasting %s.", __func__, 2994 cp->provider->name)); 2995} 2996 2997static struct g_geom * 2998g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 2999{ 3000 struct g_mirror_metadata md; 3001 struct g_mirror_softc *sc; 3002 struct g_consumer *cp; 3003 struct g_geom *gp; 3004 int error; 3005 3006 g_topology_assert(); 3007 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 3008 G_MIRROR_DEBUG(2, "Tasting %s.", pp->name); 3009 3010 gp = g_new_geomf(mp, "mirror:taste"); 3011 /* 3012 * This orphan function should be never called. 3013 */ 3014 gp->orphan = g_mirror_taste_orphan; 3015 cp = g_new_consumer(gp); 3016 g_attach(cp, pp); 3017 error = g_mirror_read_metadata(cp, &md); 3018 g_detach(cp); 3019 g_destroy_consumer(cp); 3020 g_destroy_geom(gp); 3021 if (error != 0) 3022 return (NULL); 3023 gp = NULL; 3024 3025 if (md.md_provider[0] != '\0' && 3026 !g_compare_names(md.md_provider, pp->name)) 3027 return (NULL); 3028 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize) 3029 return (NULL); 3030 if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) { 3031 G_MIRROR_DEBUG(0, 3032 "Device %s: provider %s marked as inactive, skipping.", 3033 md.md_name, pp->name); 3034 return (NULL); 3035 } 3036 if (g_mirror_debug >= 2) 3037 mirror_metadata_dump(&md); 3038 3039 /* 3040 * Let's check if device already exists. 3041 */ 3042 sc = NULL; 3043 LIST_FOREACH(gp, &mp->geom, geom) { 3044 sc = gp->softc; 3045 if (sc == NULL) 3046 continue; 3047 if (sc->sc_sync.ds_geom == gp) 3048 continue; 3049 if (strcmp(md.md_name, sc->sc_name) != 0) 3050 continue; 3051 if (md.md_mid != sc->sc_id) { 3052 G_MIRROR_DEBUG(0, "Device %s already configured.", 3053 sc->sc_name); 3054 return (NULL); 3055 } 3056 break; 3057 } 3058 if (gp == NULL) { 3059 gp = g_mirror_create(mp, &md); 3060 if (gp == NULL) { 3061 G_MIRROR_DEBUG(0, "Cannot create device %s.", 3062 md.md_name); 3063 return (NULL); 3064 } 3065 sc = gp->softc; 3066 } 3067 G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name); 3068 g_topology_unlock(); 3069 sx_xlock(&sc->sc_lock); 3070 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_TASTING; 3071 error = g_mirror_add_disk(sc, pp, &md); 3072 if (error != 0) { 3073 G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).", 3074 pp->name, gp->name, error); 3075 if (LIST_EMPTY(&sc->sc_disks)) { 3076 g_cancel_event(sc); 3077 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3078 g_topology_lock(); 3079 return (NULL); 3080 } 3081 gp = NULL; 3082 } 3083 sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_TASTING; 3084 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 3085 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3086 g_topology_lock(); 3087 return (NULL); 3088 } 3089 sx_xunlock(&sc->sc_lock); 3090 g_topology_lock(); 3091 return (gp); 3092} 3093 3094static int 3095g_mirror_destroy_geom(struct gctl_req *req __unused, 3096 struct g_class *mp __unused, struct g_geom *gp) 3097{ 3098 struct g_mirror_softc *sc; 3099 int error; 3100 3101 g_topology_unlock(); 3102 sc = gp->softc; 3103 sx_xlock(&sc->sc_lock); 3104 g_cancel_event(sc); 3105 error = g_mirror_destroy(gp->softc, G_MIRROR_DESTROY_SOFT); 3106 if (error != 0) 3107 sx_xunlock(&sc->sc_lock); 3108 g_topology_lock(); 3109 return (error); 3110} 3111 3112static void 3113g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 3114 struct g_consumer *cp, struct g_provider *pp) 3115{ 3116 struct g_mirror_softc *sc; 3117 3118 g_topology_assert(); 3119 3120 sc = gp->softc; 3121 if (sc == NULL) 3122 return; 3123 /* Skip synchronization geom. */ 3124 if (gp == sc->sc_sync.ds_geom) 3125 return; 3126 if (pp != NULL) { 3127 /* Nothing here. */ 3128 } else if (cp != NULL) { 3129 struct g_mirror_disk *disk; 3130 3131 disk = cp->private; 3132 if (disk == NULL) 3133 return; 3134 g_topology_unlock(); 3135 sx_xlock(&sc->sc_lock); 3136 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id); 3137 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3138 sbuf_printf(sb, "%s<Synchronized>", indent); 3139 if (disk->d_sync.ds_offset == 0) 3140 sbuf_printf(sb, "0%%"); 3141 else { 3142 sbuf_printf(sb, "%u%%", 3143 (u_int)((disk->d_sync.ds_offset * 100) / 3144 sc->sc_provider->mediasize)); 3145 } 3146 sbuf_printf(sb, "</Synchronized>\n"); 3147 if (disk->d_sync.ds_offset > 0) { 3148 sbuf_printf(sb, "%s<BytesSynced>%jd" 3149 "</BytesSynced>\n", indent, 3150 (intmax_t)disk->d_sync.ds_offset); 3151 } 3152 } 3153 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, 3154 disk->d_sync.ds_syncid); 3155 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, 3156 disk->d_genid); 3157 sbuf_printf(sb, "%s<Flags>", indent); 3158 if (disk->d_flags == 0) 3159 sbuf_printf(sb, "NONE"); 3160 else { 3161 int first = 1; 3162 3163#define ADD_FLAG(flag, name) do { \ 3164 if ((disk->d_flags & (flag)) != 0) { \ 3165 if (!first) \ 3166 sbuf_printf(sb, ", "); \ 3167 else \ 3168 first = 0; \ 3169 sbuf_printf(sb, name); \ 3170 } \ 3171} while (0) 3172 ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY"); 3173 ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED"); 3174 ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE"); 3175 ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING, 3176 "SYNCHRONIZING"); 3177 ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC"); 3178 ADD_FLAG(G_MIRROR_DISK_FLAG_BROKEN, "BROKEN"); 3179#undef ADD_FLAG 3180 } 3181 sbuf_printf(sb, "</Flags>\n"); 3182 sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent, 3183 disk->d_priority); 3184 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 3185 g_mirror_disk_state2str(disk->d_state)); 3186 sx_xunlock(&sc->sc_lock); 3187 g_topology_lock(); 3188 } else { 3189 g_topology_unlock(); 3190 sx_xlock(&sc->sc_lock); 3191 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id); 3192 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid); 3193 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid); 3194 sbuf_printf(sb, "%s<Flags>", indent); 3195 if (sc->sc_flags == 0) 3196 sbuf_printf(sb, "NONE"); 3197 else { 3198 int first = 1; 3199 3200#define ADD_FLAG(flag, name) do { \ 3201 if ((sc->sc_flags & (flag)) != 0) { \ 3202 if (!first) \ 3203 sbuf_printf(sb, ", "); \ 3204 else \ 3205 first = 0; \ 3206 sbuf_printf(sb, name); \ 3207 } \ 3208} while (0) 3209 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC"); 3210 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC"); 3211#undef ADD_FLAG 3212 } 3213 sbuf_printf(sb, "</Flags>\n"); 3214 sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent, 3215 (u_int)sc->sc_slice); 3216 sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent, 3217 balance_name(sc->sc_balance)); 3218 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent, 3219 sc->sc_ndisks); 3220 sbuf_printf(sb, "%s<State>", indent); 3221 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 3222 sbuf_printf(sb, "%s", "STARTING"); 3223 else if (sc->sc_ndisks == 3224 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE)) 3225 sbuf_printf(sb, "%s", "COMPLETE"); 3226 else 3227 sbuf_printf(sb, "%s", "DEGRADED"); 3228 sbuf_printf(sb, "</State>\n"); 3229 sx_xunlock(&sc->sc_lock); 3230 g_topology_lock(); 3231 } 3232} 3233 3234static void 3235g_mirror_shutdown_pre_sync(void *arg, int howto) 3236{ 3237 struct g_class *mp; 3238 struct g_geom *gp, *gp2; 3239 struct g_mirror_softc *sc; 3240 int error; 3241 3242 mp = arg; 3243 DROP_GIANT(); 3244 g_topology_lock(); 3245 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 3246 if ((sc = gp->softc) == NULL) 3247 continue; 3248 /* Skip synchronization geom. */ 3249 if (gp == sc->sc_sync.ds_geom) 3250 continue; 3251 g_topology_unlock(); 3252 sx_xlock(&sc->sc_lock); 3253 g_cancel_event(sc); 3254 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_DELAYED); 3255 if (error != 0) 3256 sx_xunlock(&sc->sc_lock); 3257 g_topology_lock(); 3258 } 3259 g_topology_unlock(); 3260 PICKUP_GIANT(); 3261} 3262 3263static void 3264g_mirror_init(struct g_class *mp) 3265{ 3266 3267 g_mirror_pre_sync = EVENTHANDLER_REGISTER(shutdown_pre_sync, 3268 g_mirror_shutdown_pre_sync, mp, SHUTDOWN_PRI_FIRST); 3269 if (g_mirror_pre_sync == NULL) 3270 G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event."); 3271} 3272 3273static void 3274g_mirror_fini(struct g_class *mp) 3275{ 3276 3277 if (g_mirror_pre_sync != NULL) 3278 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, g_mirror_pre_sync); 3279} 3280 3281DECLARE_GEOM_CLASS(g_mirror_class, g_mirror); 3282