g_mirror.c revision 223921
1178476Sjb/*- 2178476Sjb * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3178476Sjb * All rights reserved. 4178476Sjb * 5178476Sjb * Redistribution and use in source and binary forms, with or without 6178476Sjb * modification, are permitted provided that the following conditions 7178476Sjb * are met: 8178476Sjb * 1. Redistributions of source code must retain the above copyright 9178476Sjb * notice, this list of conditions and the following disclaimer. 10178476Sjb * 2. Redistributions in binary form must reproduce the above copyright 11178476Sjb * notice, this list of conditions and the following disclaimer in the 12178476Sjb * documentation and/or other materials provided with the distribution. 13178476Sjb * 14178476Sjb * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15178476Sjb * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16178476Sjb * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17178476Sjb * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18178476Sjb * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19178476Sjb * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20178476Sjb * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21178476Sjb * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22178476Sjb * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23178476Sjb * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24178476Sjb * SUCH DAMAGE. 25178476Sjb */ 26178476Sjb 27178476Sjb#include <sys/cdefs.h> 28178476Sjb__FBSDID("$FreeBSD: head/sys/geom/mirror/g_mirror.c 223921 2011-07-11 05:22:31Z ae $"); 29178476Sjb 30178476Sjb#include <sys/param.h> 31178476Sjb#include <sys/systm.h> 32178476Sjb#include <sys/kernel.h> 33178476Sjb#include <sys/module.h> 34178476Sjb#include <sys/limits.h> 35178476Sjb#include <sys/lock.h> 36178476Sjb#include <sys/mutex.h> 37178476Sjb#include <sys/bio.h> 38178476Sjb#include <sys/sbuf.h> 39178476Sjb#include <sys/sysctl.h> 40178476Sjb#include <sys/malloc.h> 41178476Sjb#include <sys/eventhandler.h> 42178476Sjb#include <vm/uma.h> 43178476Sjb#include <geom/geom.h> 44178476Sjb#include <sys/proc.h> 45178476Sjb#include <sys/kthread.h> 46178476Sjb#include <sys/sched.h> 47178476Sjb#include <geom/mirror/g_mirror.h> 48178476Sjb 49178476SjbFEATURE(geom_mirror, "GEOM mirroring support"); 50178476Sjb 51178476Sjbstatic MALLOC_DEFINE(M_MIRROR, "mirror_data", "GEOM_MIRROR Data"); 52178476Sjb 53178476SjbSYSCTL_DECL(_kern_geom); 54178476SjbSYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW, 0, "GEOM_MIRROR stuff"); 55178476Sjbu_int g_mirror_debug = 0; 56178476SjbTUNABLE_INT("kern.geom.mirror.debug", &g_mirror_debug); 57178476SjbSYSCTL_UINT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RW, &g_mirror_debug, 0, 58 "Debug level"); 59static u_int g_mirror_timeout = 4; 60TUNABLE_INT("kern.geom.mirror.timeout", &g_mirror_timeout); 61SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RW, &g_mirror_timeout, 62 0, "Time to wait on all mirror components"); 63static u_int g_mirror_idletime = 5; 64TUNABLE_INT("kern.geom.mirror.idletime", &g_mirror_idletime); 65SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, idletime, CTLFLAG_RW, 66 &g_mirror_idletime, 0, "Mark components as clean when idling"); 67static u_int g_mirror_disconnect_on_failure = 1; 68TUNABLE_INT("kern.geom.mirror.disconnect_on_failure", 69 &g_mirror_disconnect_on_failure); 70SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, disconnect_on_failure, CTLFLAG_RW, 71 &g_mirror_disconnect_on_failure, 0, "Disconnect component on I/O failure."); 72static u_int g_mirror_syncreqs = 2; 73TUNABLE_INT("kern.geom.mirror.sync_requests", &g_mirror_syncreqs); 74SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_requests, CTLFLAG_RDTUN, 75 &g_mirror_syncreqs, 0, "Parallel synchronization I/O requests."); 76 77#define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \ 78 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \ 79 msleep((ident), (mtx), (priority), (wmesg), (timeout)); \ 80 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \ 81} while (0) 82 83static eventhandler_tag g_mirror_pre_sync = NULL; 84 85static int g_mirror_destroy_geom(struct gctl_req *req, struct g_class *mp, 86 struct g_geom *gp); 87static g_taste_t g_mirror_taste; 88static void g_mirror_init(struct g_class *mp); 89static void g_mirror_fini(struct g_class *mp); 90 91struct g_class g_mirror_class = { 92 .name = G_MIRROR_CLASS_NAME, 93 .version = G_VERSION, 94 .ctlreq = g_mirror_config, 95 .taste = g_mirror_taste, 96 .destroy_geom = g_mirror_destroy_geom, 97 .init = g_mirror_init, 98 .fini = g_mirror_fini 99}; 100 101 102static void g_mirror_destroy_provider(struct g_mirror_softc *sc); 103static int g_mirror_update_disk(struct g_mirror_disk *disk, u_int state); 104static void g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force); 105static void g_mirror_dumpconf(struct sbuf *sb, const char *indent, 106 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp); 107static void g_mirror_sync_stop(struct g_mirror_disk *disk, int type); 108static void g_mirror_register_request(struct bio *bp); 109static void g_mirror_sync_release(struct g_mirror_softc *sc); 110 111 112static const char * 113g_mirror_disk_state2str(int state) 114{ 115 116 switch (state) { 117 case G_MIRROR_DISK_STATE_NONE: 118 return ("NONE"); 119 case G_MIRROR_DISK_STATE_NEW: 120 return ("NEW"); 121 case G_MIRROR_DISK_STATE_ACTIVE: 122 return ("ACTIVE"); 123 case G_MIRROR_DISK_STATE_STALE: 124 return ("STALE"); 125 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 126 return ("SYNCHRONIZING"); 127 case G_MIRROR_DISK_STATE_DISCONNECTED: 128 return ("DISCONNECTED"); 129 case G_MIRROR_DISK_STATE_DESTROY: 130 return ("DESTROY"); 131 default: 132 return ("INVALID"); 133 } 134} 135 136static const char * 137g_mirror_device_state2str(int state) 138{ 139 140 switch (state) { 141 case G_MIRROR_DEVICE_STATE_STARTING: 142 return ("STARTING"); 143 case G_MIRROR_DEVICE_STATE_RUNNING: 144 return ("RUNNING"); 145 default: 146 return ("INVALID"); 147 } 148} 149 150static const char * 151g_mirror_get_diskname(struct g_mirror_disk *disk) 152{ 153 154 if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL) 155 return ("[unknown]"); 156 return (disk->d_name); 157} 158 159/* 160 * --- Events handling functions --- 161 * Events in geom_mirror are used to maintain disks and device status 162 * from one thread to simplify locking. 163 */ 164static void 165g_mirror_event_free(struct g_mirror_event *ep) 166{ 167 168 free(ep, M_MIRROR); 169} 170 171int 172g_mirror_event_send(void *arg, int state, int flags) 173{ 174 struct g_mirror_softc *sc; 175 struct g_mirror_disk *disk; 176 struct g_mirror_event *ep; 177 int error; 178 179 ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK); 180 G_MIRROR_DEBUG(4, "%s: Sending event %p.", __func__, ep); 181 if ((flags & G_MIRROR_EVENT_DEVICE) != 0) { 182 disk = NULL; 183 sc = arg; 184 } else { 185 disk = arg; 186 sc = disk->d_softc; 187 } 188 ep->e_disk = disk; 189 ep->e_state = state; 190 ep->e_flags = flags; 191 ep->e_error = 0; 192 mtx_lock(&sc->sc_events_mtx); 193 TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next); 194 mtx_unlock(&sc->sc_events_mtx); 195 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 196 mtx_lock(&sc->sc_queue_mtx); 197 wakeup(sc); 198 mtx_unlock(&sc->sc_queue_mtx); 199 if ((flags & G_MIRROR_EVENT_DONTWAIT) != 0) 200 return (0); 201 sx_assert(&sc->sc_lock, SX_XLOCKED); 202 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep); 203 sx_xunlock(&sc->sc_lock); 204 while ((ep->e_flags & G_MIRROR_EVENT_DONE) == 0) { 205 mtx_lock(&sc->sc_events_mtx); 206 MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "m:event", 207 hz * 5); 208 } 209 error = ep->e_error; 210 g_mirror_event_free(ep); 211 sx_xlock(&sc->sc_lock); 212 return (error); 213} 214 215static struct g_mirror_event * 216g_mirror_event_get(struct g_mirror_softc *sc) 217{ 218 struct g_mirror_event *ep; 219 220 mtx_lock(&sc->sc_events_mtx); 221 ep = TAILQ_FIRST(&sc->sc_events); 222 mtx_unlock(&sc->sc_events_mtx); 223 return (ep); 224} 225 226static void 227g_mirror_event_remove(struct g_mirror_softc *sc, struct g_mirror_event *ep) 228{ 229 230 mtx_lock(&sc->sc_events_mtx); 231 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 232 mtx_unlock(&sc->sc_events_mtx); 233} 234 235static void 236g_mirror_event_cancel(struct g_mirror_disk *disk) 237{ 238 struct g_mirror_softc *sc; 239 struct g_mirror_event *ep, *tmpep; 240 241 sc = disk->d_softc; 242 sx_assert(&sc->sc_lock, SX_XLOCKED); 243 244 mtx_lock(&sc->sc_events_mtx); 245 TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) { 246 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) 247 continue; 248 if (ep->e_disk != disk) 249 continue; 250 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 251 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 252 g_mirror_event_free(ep); 253 else { 254 ep->e_error = ECANCELED; 255 wakeup(ep); 256 } 257 } 258 mtx_unlock(&sc->sc_events_mtx); 259} 260 261/* 262 * Return the number of disks in given state. 263 * If state is equal to -1, count all connected disks. 264 */ 265u_int 266g_mirror_ndisks(struct g_mirror_softc *sc, int state) 267{ 268 struct g_mirror_disk *disk; 269 u_int n = 0; 270 271 sx_assert(&sc->sc_lock, SX_LOCKED); 272 273 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 274 if (state == -1 || disk->d_state == state) 275 n++; 276 } 277 return (n); 278} 279 280/* 281 * Find a disk in mirror by its disk ID. 282 */ 283static struct g_mirror_disk * 284g_mirror_id2disk(struct g_mirror_softc *sc, uint32_t id) 285{ 286 struct g_mirror_disk *disk; 287 288 sx_assert(&sc->sc_lock, SX_XLOCKED); 289 290 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 291 if (disk->d_id == id) 292 return (disk); 293 } 294 return (NULL); 295} 296 297static u_int 298g_mirror_nrequests(struct g_mirror_softc *sc, struct g_consumer *cp) 299{ 300 struct bio *bp; 301 u_int nreqs = 0; 302 303 mtx_lock(&sc->sc_queue_mtx); 304 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) { 305 if (bp->bio_from == cp) 306 nreqs++; 307 } 308 mtx_unlock(&sc->sc_queue_mtx); 309 return (nreqs); 310} 311 312static int 313g_mirror_is_busy(struct g_mirror_softc *sc, struct g_consumer *cp) 314{ 315 316 if (cp->index > 0) { 317 G_MIRROR_DEBUG(2, 318 "I/O requests for %s exist, can't destroy it now.", 319 cp->provider->name); 320 return (1); 321 } 322 if (g_mirror_nrequests(sc, cp) > 0) { 323 G_MIRROR_DEBUG(2, 324 "I/O requests for %s in queue, can't destroy it now.", 325 cp->provider->name); 326 return (1); 327 } 328 return (0); 329} 330 331static void 332g_mirror_destroy_consumer(void *arg, int flags __unused) 333{ 334 struct g_consumer *cp; 335 336 g_topology_assert(); 337 338 cp = arg; 339 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", cp->provider->name); 340 g_detach(cp); 341 g_destroy_consumer(cp); 342} 343 344static void 345g_mirror_kill_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 346{ 347 struct g_provider *pp; 348 int retaste_wait; 349 350 g_topology_assert(); 351 352 cp->private = NULL; 353 if (g_mirror_is_busy(sc, cp)) 354 return; 355 pp = cp->provider; 356 retaste_wait = 0; 357 if (cp->acw == 1) { 358 if ((pp->geom->flags & G_GEOM_WITHER) == 0) 359 retaste_wait = 1; 360 } 361 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", pp->name, -cp->acr, 362 -cp->acw, -cp->ace, 0); 363 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 364 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 365 if (retaste_wait) { 366 /* 367 * After retaste event was send (inside g_access()), we can send 368 * event to detach and destroy consumer. 369 * A class, which has consumer to the given provider connected 370 * will not receive retaste event for the provider. 371 * This is the way how I ignore retaste events when I close 372 * consumers opened for write: I detach and destroy consumer 373 * after retaste event is sent. 374 */ 375 g_post_event(g_mirror_destroy_consumer, cp, M_WAITOK, NULL); 376 return; 377 } 378 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", pp->name); 379 g_detach(cp); 380 g_destroy_consumer(cp); 381} 382 383static int 384g_mirror_connect_disk(struct g_mirror_disk *disk, struct g_provider *pp) 385{ 386 struct g_consumer *cp; 387 int error; 388 389 g_topology_assert_not(); 390 KASSERT(disk->d_consumer == NULL, 391 ("Disk already connected (device %s).", disk->d_softc->sc_name)); 392 393 g_topology_lock(); 394 cp = g_new_consumer(disk->d_softc->sc_geom); 395 error = g_attach(cp, pp); 396 if (error != 0) { 397 g_destroy_consumer(cp); 398 g_topology_unlock(); 399 return (error); 400 } 401 error = g_access(cp, 1, 1, 1); 402 if (error != 0) { 403 g_detach(cp); 404 g_destroy_consumer(cp); 405 g_topology_unlock(); 406 G_MIRROR_DEBUG(0, "Cannot open consumer %s (error=%d).", 407 pp->name, error); 408 return (error); 409 } 410 g_topology_unlock(); 411 disk->d_consumer = cp; 412 disk->d_consumer->private = disk; 413 disk->d_consumer->index = 0; 414 415 G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk)); 416 return (0); 417} 418 419static void 420g_mirror_disconnect_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 421{ 422 423 g_topology_assert(); 424 425 if (cp == NULL) 426 return; 427 if (cp->provider != NULL) 428 g_mirror_kill_consumer(sc, cp); 429 else 430 g_destroy_consumer(cp); 431} 432 433/* 434 * Initialize disk. This means allocate memory, create consumer, attach it 435 * to the provider and open access (r1w1e1) to it. 436 */ 437static struct g_mirror_disk * 438g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp, 439 struct g_mirror_metadata *md, int *errorp) 440{ 441 struct g_mirror_disk *disk; 442 int error; 443 444 disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO); 445 if (disk == NULL) { 446 error = ENOMEM; 447 goto fail; 448 } 449 disk->d_softc = sc; 450 error = g_mirror_connect_disk(disk, pp); 451 if (error != 0) 452 goto fail; 453 disk->d_id = md->md_did; 454 disk->d_state = G_MIRROR_DISK_STATE_NONE; 455 disk->d_priority = md->md_priority; 456 disk->d_flags = md->md_dflags; 457 if (md->md_provider[0] != '\0') 458 disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED; 459 disk->d_sync.ds_consumer = NULL; 460 disk->d_sync.ds_offset = md->md_sync_offset; 461 disk->d_sync.ds_offset_done = md->md_sync_offset; 462 disk->d_genid = md->md_genid; 463 disk->d_sync.ds_syncid = md->md_syncid; 464 if (errorp != NULL) 465 *errorp = 0; 466 return (disk); 467fail: 468 if (errorp != NULL) 469 *errorp = error; 470 if (disk != NULL) 471 free(disk, M_MIRROR); 472 return (NULL); 473} 474 475static void 476g_mirror_destroy_disk(struct g_mirror_disk *disk) 477{ 478 struct g_mirror_softc *sc; 479 480 g_topology_assert_not(); 481 sc = disk->d_softc; 482 sx_assert(&sc->sc_lock, SX_XLOCKED); 483 484 LIST_REMOVE(disk, d_next); 485 g_mirror_event_cancel(disk); 486 if (sc->sc_hint == disk) 487 sc->sc_hint = NULL; 488 switch (disk->d_state) { 489 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 490 g_mirror_sync_stop(disk, 1); 491 /* FALLTHROUGH */ 492 case G_MIRROR_DISK_STATE_NEW: 493 case G_MIRROR_DISK_STATE_STALE: 494 case G_MIRROR_DISK_STATE_ACTIVE: 495 g_topology_lock(); 496 g_mirror_disconnect_consumer(sc, disk->d_consumer); 497 g_topology_unlock(); 498 free(disk, M_MIRROR); 499 break; 500 default: 501 KASSERT(0 == 1, ("Wrong disk state (%s, %s).", 502 g_mirror_get_diskname(disk), 503 g_mirror_disk_state2str(disk->d_state))); 504 } 505} 506 507static void 508g_mirror_destroy_device(struct g_mirror_softc *sc) 509{ 510 struct g_mirror_disk *disk; 511 struct g_mirror_event *ep; 512 struct g_geom *gp; 513 struct g_consumer *cp, *tmpcp; 514 515 g_topology_assert_not(); 516 sx_assert(&sc->sc_lock, SX_XLOCKED); 517 518 gp = sc->sc_geom; 519 if (sc->sc_provider != NULL) 520 g_mirror_destroy_provider(sc); 521 for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL; 522 disk = LIST_FIRST(&sc->sc_disks)) { 523 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 524 g_mirror_update_metadata(disk); 525 g_mirror_destroy_disk(disk); 526 } 527 while ((ep = g_mirror_event_get(sc)) != NULL) { 528 g_mirror_event_remove(sc, ep); 529 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 530 g_mirror_event_free(ep); 531 else { 532 ep->e_error = ECANCELED; 533 ep->e_flags |= G_MIRROR_EVENT_DONE; 534 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep); 535 mtx_lock(&sc->sc_events_mtx); 536 wakeup(ep); 537 mtx_unlock(&sc->sc_events_mtx); 538 } 539 } 540 callout_drain(&sc->sc_callout); 541 542 g_topology_lock(); 543 LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) { 544 g_mirror_disconnect_consumer(sc, cp); 545 } 546 g_wither_geom(sc->sc_sync.ds_geom, ENXIO); 547 G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name); 548 g_wither_geom(gp, ENXIO); 549 g_topology_unlock(); 550 mtx_destroy(&sc->sc_queue_mtx); 551 mtx_destroy(&sc->sc_events_mtx); 552 sx_xunlock(&sc->sc_lock); 553 sx_destroy(&sc->sc_lock); 554} 555 556static void 557g_mirror_orphan(struct g_consumer *cp) 558{ 559 struct g_mirror_disk *disk; 560 561 g_topology_assert(); 562 563 disk = cp->private; 564 if (disk == NULL) 565 return; 566 disk->d_softc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 567 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 568 G_MIRROR_EVENT_DONTWAIT); 569} 570 571/* 572 * Function should return the next active disk on the list. 573 * It is possible that it will be the same disk as given. 574 * If there are no active disks on list, NULL is returned. 575 */ 576static __inline struct g_mirror_disk * 577g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 578{ 579 struct g_mirror_disk *dp; 580 581 for (dp = LIST_NEXT(disk, d_next); dp != disk; 582 dp = LIST_NEXT(dp, d_next)) { 583 if (dp == NULL) 584 dp = LIST_FIRST(&sc->sc_disks); 585 if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE) 586 break; 587 } 588 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 589 return (NULL); 590 return (dp); 591} 592 593static struct g_mirror_disk * 594g_mirror_get_disk(struct g_mirror_softc *sc) 595{ 596 struct g_mirror_disk *disk; 597 598 if (sc->sc_hint == NULL) { 599 sc->sc_hint = LIST_FIRST(&sc->sc_disks); 600 if (sc->sc_hint == NULL) 601 return (NULL); 602 } 603 disk = sc->sc_hint; 604 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) { 605 disk = g_mirror_find_next(sc, disk); 606 if (disk == NULL) 607 return (NULL); 608 } 609 sc->sc_hint = g_mirror_find_next(sc, disk); 610 return (disk); 611} 612 613static int 614g_mirror_write_metadata(struct g_mirror_disk *disk, 615 struct g_mirror_metadata *md) 616{ 617 struct g_mirror_softc *sc; 618 struct g_consumer *cp; 619 off_t offset, length; 620 u_char *sector; 621 int error = 0; 622 623 g_topology_assert_not(); 624 sc = disk->d_softc; 625 sx_assert(&sc->sc_lock, SX_LOCKED); 626 627 cp = disk->d_consumer; 628 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name)); 629 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name)); 630 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 631 ("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr, 632 cp->acw, cp->ace)); 633 length = cp->provider->sectorsize; 634 offset = cp->provider->mediasize - length; 635 sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO); 636 if (md != NULL) 637 mirror_metadata_encode(md, sector); 638 error = g_write_data(cp, offset, sector, length); 639 free(sector, M_MIRROR); 640 if (error != 0) { 641 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 642 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 643 G_MIRROR_DEBUG(0, "Cannot write metadata on %s " 644 "(device=%s, error=%d).", 645 g_mirror_get_diskname(disk), sc->sc_name, error); 646 } else { 647 G_MIRROR_DEBUG(1, "Cannot write metadata on %s " 648 "(device=%s, error=%d).", 649 g_mirror_get_diskname(disk), sc->sc_name, error); 650 } 651 if (g_mirror_disconnect_on_failure && 652 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) { 653 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 654 g_mirror_event_send(disk, 655 G_MIRROR_DISK_STATE_DISCONNECTED, 656 G_MIRROR_EVENT_DONTWAIT); 657 } 658 } 659 return (error); 660} 661 662static int 663g_mirror_clear_metadata(struct g_mirror_disk *disk) 664{ 665 int error; 666 667 g_topology_assert_not(); 668 sx_assert(&disk->d_softc->sc_lock, SX_LOCKED); 669 670 error = g_mirror_write_metadata(disk, NULL); 671 if (error == 0) { 672 G_MIRROR_DEBUG(2, "Metadata on %s cleared.", 673 g_mirror_get_diskname(disk)); 674 } else { 675 G_MIRROR_DEBUG(0, 676 "Cannot clear metadata on disk %s (error=%d).", 677 g_mirror_get_diskname(disk), error); 678 } 679 return (error); 680} 681 682void 683g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk, 684 struct g_mirror_metadata *md) 685{ 686 687 strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic)); 688 md->md_version = G_MIRROR_VERSION; 689 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name)); 690 md->md_mid = sc->sc_id; 691 md->md_all = sc->sc_ndisks; 692 md->md_slice = sc->sc_slice; 693 md->md_balance = sc->sc_balance; 694 md->md_genid = sc->sc_genid; 695 md->md_mediasize = sc->sc_mediasize; 696 md->md_sectorsize = sc->sc_sectorsize; 697 md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK); 698 bzero(md->md_provider, sizeof(md->md_provider)); 699 if (disk == NULL) { 700 md->md_did = arc4random(); 701 md->md_priority = 0; 702 md->md_syncid = 0; 703 md->md_dflags = 0; 704 md->md_sync_offset = 0; 705 md->md_provsize = 0; 706 } else { 707 md->md_did = disk->d_id; 708 md->md_priority = disk->d_priority; 709 md->md_syncid = disk->d_sync.ds_syncid; 710 md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK); 711 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 712 md->md_sync_offset = disk->d_sync.ds_offset_done; 713 else 714 md->md_sync_offset = 0; 715 if ((disk->d_flags & G_MIRROR_DISK_FLAG_HARDCODED) != 0) { 716 strlcpy(md->md_provider, 717 disk->d_consumer->provider->name, 718 sizeof(md->md_provider)); 719 } 720 md->md_provsize = disk->d_consumer->provider->mediasize; 721 } 722} 723 724void 725g_mirror_update_metadata(struct g_mirror_disk *disk) 726{ 727 struct g_mirror_softc *sc; 728 struct g_mirror_metadata md; 729 int error; 730 731 g_topology_assert_not(); 732 sc = disk->d_softc; 733 sx_assert(&sc->sc_lock, SX_LOCKED); 734 735 g_mirror_fill_metadata(sc, disk, &md); 736 error = g_mirror_write_metadata(disk, &md); 737 if (error == 0) { 738 G_MIRROR_DEBUG(2, "Metadata on %s updated.", 739 g_mirror_get_diskname(disk)); 740 } else { 741 G_MIRROR_DEBUG(0, 742 "Cannot update metadata on disk %s (error=%d).", 743 g_mirror_get_diskname(disk), error); 744 } 745} 746 747static void 748g_mirror_bump_syncid(struct g_mirror_softc *sc) 749{ 750 struct g_mirror_disk *disk; 751 752 g_topology_assert_not(); 753 sx_assert(&sc->sc_lock, SX_XLOCKED); 754 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 755 ("%s called with no active disks (device=%s).", __func__, 756 sc->sc_name)); 757 758 sc->sc_syncid++; 759 G_MIRROR_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name, 760 sc->sc_syncid); 761 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 762 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 763 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 764 disk->d_sync.ds_syncid = sc->sc_syncid; 765 g_mirror_update_metadata(disk); 766 } 767 } 768} 769 770static void 771g_mirror_bump_genid(struct g_mirror_softc *sc) 772{ 773 struct g_mirror_disk *disk; 774 775 g_topology_assert_not(); 776 sx_assert(&sc->sc_lock, SX_XLOCKED); 777 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 778 ("%s called with no active disks (device=%s).", __func__, 779 sc->sc_name)); 780 781 sc->sc_genid++; 782 G_MIRROR_DEBUG(1, "Device %s: genid bumped to %u.", sc->sc_name, 783 sc->sc_genid); 784 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 785 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 786 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 787 disk->d_genid = sc->sc_genid; 788 g_mirror_update_metadata(disk); 789 } 790 } 791} 792 793static int 794g_mirror_idle(struct g_mirror_softc *sc, int acw) 795{ 796 struct g_mirror_disk *disk; 797 int timeout; 798 799 g_topology_assert_not(); 800 sx_assert(&sc->sc_lock, SX_XLOCKED); 801 802 if (sc->sc_provider == NULL) 803 return (0); 804 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 805 return (0); 806 if (sc->sc_idle) 807 return (0); 808 if (sc->sc_writes > 0) 809 return (0); 810 if (acw > 0 || (acw == -1 && sc->sc_provider->acw > 0)) { 811 timeout = g_mirror_idletime - (time_uptime - sc->sc_last_write); 812 if (timeout > 0) 813 return (timeout); 814 } 815 sc->sc_idle = 1; 816 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 817 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 818 continue; 819 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.", 820 g_mirror_get_diskname(disk), sc->sc_name); 821 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 822 g_mirror_update_metadata(disk); 823 } 824 return (0); 825} 826 827static void 828g_mirror_unidle(struct g_mirror_softc *sc) 829{ 830 struct g_mirror_disk *disk; 831 832 g_topology_assert_not(); 833 sx_assert(&sc->sc_lock, SX_XLOCKED); 834 835 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 836 return; 837 sc->sc_idle = 0; 838 sc->sc_last_write = time_uptime; 839 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 840 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 841 continue; 842 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.", 843 g_mirror_get_diskname(disk), sc->sc_name); 844 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 845 g_mirror_update_metadata(disk); 846 } 847} 848 849static void 850g_mirror_done(struct bio *bp) 851{ 852 struct g_mirror_softc *sc; 853 854 sc = bp->bio_from->geom->softc; 855 bp->bio_cflags = G_MIRROR_BIO_FLAG_REGULAR; 856 mtx_lock(&sc->sc_queue_mtx); 857 bioq_disksort(&sc->sc_queue, bp); 858 mtx_unlock(&sc->sc_queue_mtx); 859 wakeup(sc); 860} 861 862static void 863g_mirror_regular_request(struct bio *bp) 864{ 865 struct g_mirror_softc *sc; 866 struct g_mirror_disk *disk; 867 struct bio *pbp; 868 869 g_topology_assert_not(); 870 871 pbp = bp->bio_parent; 872 sc = pbp->bio_to->geom->softc; 873 bp->bio_from->index--; 874 if (bp->bio_cmd == BIO_WRITE) 875 sc->sc_writes--; 876 disk = bp->bio_from->private; 877 if (disk == NULL) { 878 g_topology_lock(); 879 g_mirror_kill_consumer(sc, bp->bio_from); 880 g_topology_unlock(); 881 } 882 883 pbp->bio_inbed++; 884 KASSERT(pbp->bio_inbed <= pbp->bio_children, 885 ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed, 886 pbp->bio_children)); 887 if (bp->bio_error == 0 && pbp->bio_error == 0) { 888 G_MIRROR_LOGREQ(3, bp, "Request delivered."); 889 g_destroy_bio(bp); 890 if (pbp->bio_children == pbp->bio_inbed) { 891 G_MIRROR_LOGREQ(3, pbp, "Request delivered."); 892 pbp->bio_completed = pbp->bio_length; 893 if (pbp->bio_cmd == BIO_WRITE) { 894 bioq_remove(&sc->sc_inflight, pbp); 895 /* Release delayed sync requests if possible. */ 896 g_mirror_sync_release(sc); 897 } 898 g_io_deliver(pbp, pbp->bio_error); 899 } 900 return; 901 } else if (bp->bio_error != 0) { 902 if (pbp->bio_error == 0) 903 pbp->bio_error = bp->bio_error; 904 if (disk != NULL) { 905 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 906 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 907 G_MIRROR_LOGREQ(0, bp, 908 "Request failed (error=%d).", 909 bp->bio_error); 910 } else { 911 G_MIRROR_LOGREQ(1, bp, 912 "Request failed (error=%d).", 913 bp->bio_error); 914 } 915 if (g_mirror_disconnect_on_failure && 916 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) 917 { 918 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 919 g_mirror_event_send(disk, 920 G_MIRROR_DISK_STATE_DISCONNECTED, 921 G_MIRROR_EVENT_DONTWAIT); 922 } 923 } 924 switch (pbp->bio_cmd) { 925 case BIO_DELETE: 926 case BIO_WRITE: 927 pbp->bio_inbed--; 928 pbp->bio_children--; 929 break; 930 } 931 } 932 g_destroy_bio(bp); 933 934 switch (pbp->bio_cmd) { 935 case BIO_READ: 936 if (pbp->bio_inbed < pbp->bio_children) 937 break; 938 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 1) 939 g_io_deliver(pbp, pbp->bio_error); 940 else { 941 pbp->bio_error = 0; 942 mtx_lock(&sc->sc_queue_mtx); 943 bioq_disksort(&sc->sc_queue, pbp); 944 mtx_unlock(&sc->sc_queue_mtx); 945 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 946 wakeup(sc); 947 } 948 break; 949 case BIO_DELETE: 950 case BIO_WRITE: 951 if (pbp->bio_children == 0) { 952 /* 953 * All requests failed. 954 */ 955 } else if (pbp->bio_inbed < pbp->bio_children) { 956 /* Do nothing. */ 957 break; 958 } else if (pbp->bio_children == pbp->bio_inbed) { 959 /* Some requests succeeded. */ 960 pbp->bio_error = 0; 961 pbp->bio_completed = pbp->bio_length; 962 } 963 bioq_remove(&sc->sc_inflight, pbp); 964 /* Release delayed sync requests if possible. */ 965 g_mirror_sync_release(sc); 966 g_io_deliver(pbp, pbp->bio_error); 967 break; 968 default: 969 KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd)); 970 break; 971 } 972} 973 974static void 975g_mirror_sync_done(struct bio *bp) 976{ 977 struct g_mirror_softc *sc; 978 979 G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered."); 980 sc = bp->bio_from->geom->softc; 981 bp->bio_cflags = G_MIRROR_BIO_FLAG_SYNC; 982 mtx_lock(&sc->sc_queue_mtx); 983 bioq_disksort(&sc->sc_queue, bp); 984 mtx_unlock(&sc->sc_queue_mtx); 985 wakeup(sc); 986} 987 988static void 989g_mirror_kernel_dump(struct bio *bp) 990{ 991 struct g_mirror_softc *sc; 992 struct g_mirror_disk *disk; 993 struct bio *cbp; 994 struct g_kerneldump *gkd; 995 996 /* 997 * We configure dumping to the first component, because this component 998 * will be used for reading with 'prefer' balance algorithm. 999 * If the component with the higest priority is currently disconnected 1000 * we will not be able to read the dump after the reboot if it will be 1001 * connected and synchronized later. Can we do something better? 1002 */ 1003 sc = bp->bio_to->geom->softc; 1004 disk = LIST_FIRST(&sc->sc_disks); 1005 1006 gkd = (struct g_kerneldump *)bp->bio_data; 1007 if (gkd->length > bp->bio_to->mediasize) 1008 gkd->length = bp->bio_to->mediasize; 1009 cbp = g_clone_bio(bp); 1010 if (cbp == NULL) { 1011 g_io_deliver(bp, ENOMEM); 1012 return; 1013 } 1014 cbp->bio_done = g_std_done; 1015 g_io_request(cbp, disk->d_consumer); 1016 G_MIRROR_DEBUG(1, "Kernel dump will go to %s.", 1017 g_mirror_get_diskname(disk)); 1018} 1019 1020static void 1021g_mirror_flush(struct g_mirror_softc *sc, struct bio *bp) 1022{ 1023 struct bio_queue_head queue; 1024 struct g_mirror_disk *disk; 1025 struct g_consumer *cp; 1026 struct bio *cbp; 1027 1028 bioq_init(&queue); 1029 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1030 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1031 continue; 1032 cbp = g_clone_bio(bp); 1033 if (cbp == NULL) { 1034 for (cbp = bioq_first(&queue); cbp != NULL; 1035 cbp = bioq_first(&queue)) { 1036 bioq_remove(&queue, cbp); 1037 g_destroy_bio(cbp); 1038 } 1039 if (bp->bio_error == 0) 1040 bp->bio_error = ENOMEM; 1041 g_io_deliver(bp, bp->bio_error); 1042 return; 1043 } 1044 bioq_insert_tail(&queue, cbp); 1045 cbp->bio_done = g_std_done; 1046 cbp->bio_caller1 = disk; 1047 cbp->bio_to = disk->d_consumer->provider; 1048 } 1049 for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) { 1050 bioq_remove(&queue, cbp); 1051 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1052 disk = cbp->bio_caller1; 1053 cbp->bio_caller1 = NULL; 1054 cp = disk->d_consumer; 1055 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1056 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1057 cp->acr, cp->acw, cp->ace)); 1058 g_io_request(cbp, disk->d_consumer); 1059 } 1060} 1061 1062static void 1063g_mirror_start(struct bio *bp) 1064{ 1065 struct g_mirror_softc *sc; 1066 1067 sc = bp->bio_to->geom->softc; 1068 /* 1069 * If sc == NULL or there are no valid disks, provider's error 1070 * should be set and g_mirror_start() should not be called at all. 1071 */ 1072 KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1073 ("Provider's error should be set (error=%d)(mirror=%s).", 1074 bp->bio_to->error, bp->bio_to->name)); 1075 G_MIRROR_LOGREQ(3, bp, "Request received."); 1076 1077 switch (bp->bio_cmd) { 1078 case BIO_READ: 1079 case BIO_WRITE: 1080 case BIO_DELETE: 1081 break; 1082 case BIO_FLUSH: 1083 g_mirror_flush(sc, bp); 1084 return; 1085 case BIO_GETATTR: 1086 if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) { 1087 g_mirror_kernel_dump(bp); 1088 return; 1089 } 1090 /* FALLTHROUGH */ 1091 default: 1092 g_io_deliver(bp, EOPNOTSUPP); 1093 return; 1094 } 1095 mtx_lock(&sc->sc_queue_mtx); 1096 bioq_disksort(&sc->sc_queue, bp); 1097 mtx_unlock(&sc->sc_queue_mtx); 1098 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 1099 wakeup(sc); 1100} 1101 1102/* 1103 * Return TRUE if the given request is colliding with a in-progress 1104 * synchronization request. 1105 */ 1106static int 1107g_mirror_sync_collision(struct g_mirror_softc *sc, struct bio *bp) 1108{ 1109 struct g_mirror_disk *disk; 1110 struct bio *sbp; 1111 off_t rstart, rend, sstart, send; 1112 int i; 1113 1114 if (sc->sc_sync.ds_ndisks == 0) 1115 return (0); 1116 rstart = bp->bio_offset; 1117 rend = bp->bio_offset + bp->bio_length; 1118 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1119 if (disk->d_state != G_MIRROR_DISK_STATE_SYNCHRONIZING) 1120 continue; 1121 for (i = 0; i < g_mirror_syncreqs; i++) { 1122 sbp = disk->d_sync.ds_bios[i]; 1123 if (sbp == NULL) 1124 continue; 1125 sstart = sbp->bio_offset; 1126 send = sbp->bio_offset + sbp->bio_length; 1127 if (rend > sstart && rstart < send) 1128 return (1); 1129 } 1130 } 1131 return (0); 1132} 1133 1134/* 1135 * Return TRUE if the given sync request is colliding with a in-progress regular 1136 * request. 1137 */ 1138static int 1139g_mirror_regular_collision(struct g_mirror_softc *sc, struct bio *sbp) 1140{ 1141 off_t rstart, rend, sstart, send; 1142 struct bio *bp; 1143 1144 if (sc->sc_sync.ds_ndisks == 0) 1145 return (0); 1146 sstart = sbp->bio_offset; 1147 send = sbp->bio_offset + sbp->bio_length; 1148 TAILQ_FOREACH(bp, &sc->sc_inflight.queue, bio_queue) { 1149 rstart = bp->bio_offset; 1150 rend = bp->bio_offset + bp->bio_length; 1151 if (rend > sstart && rstart < send) 1152 return (1); 1153 } 1154 return (0); 1155} 1156 1157/* 1158 * Puts request onto delayed queue. 1159 */ 1160static void 1161g_mirror_regular_delay(struct g_mirror_softc *sc, struct bio *bp) 1162{ 1163 1164 G_MIRROR_LOGREQ(2, bp, "Delaying request."); 1165 bioq_insert_head(&sc->sc_regular_delayed, bp); 1166} 1167 1168/* 1169 * Puts synchronization request onto delayed queue. 1170 */ 1171static void 1172g_mirror_sync_delay(struct g_mirror_softc *sc, struct bio *bp) 1173{ 1174 1175 G_MIRROR_LOGREQ(2, bp, "Delaying synchronization request."); 1176 bioq_insert_tail(&sc->sc_sync_delayed, bp); 1177} 1178 1179/* 1180 * Releases delayed regular requests which don't collide anymore with sync 1181 * requests. 1182 */ 1183static void 1184g_mirror_regular_release(struct g_mirror_softc *sc) 1185{ 1186 struct bio *bp, *bp2; 1187 1188 TAILQ_FOREACH_SAFE(bp, &sc->sc_regular_delayed.queue, bio_queue, bp2) { 1189 if (g_mirror_sync_collision(sc, bp)) 1190 continue; 1191 bioq_remove(&sc->sc_regular_delayed, bp); 1192 G_MIRROR_LOGREQ(2, bp, "Releasing delayed request (%p).", bp); 1193 mtx_lock(&sc->sc_queue_mtx); 1194 bioq_insert_head(&sc->sc_queue, bp); 1195#if 0 1196 /* 1197 * wakeup() is not needed, because this function is called from 1198 * the worker thread. 1199 */ 1200 wakeup(&sc->sc_queue); 1201#endif 1202 mtx_unlock(&sc->sc_queue_mtx); 1203 } 1204} 1205 1206/* 1207 * Releases delayed sync requests which don't collide anymore with regular 1208 * requests. 1209 */ 1210static void 1211g_mirror_sync_release(struct g_mirror_softc *sc) 1212{ 1213 struct bio *bp, *bp2; 1214 1215 TAILQ_FOREACH_SAFE(bp, &sc->sc_sync_delayed.queue, bio_queue, bp2) { 1216 if (g_mirror_regular_collision(sc, bp)) 1217 continue; 1218 bioq_remove(&sc->sc_sync_delayed, bp); 1219 G_MIRROR_LOGREQ(2, bp, 1220 "Releasing delayed synchronization request."); 1221 g_io_request(bp, bp->bio_from); 1222 } 1223} 1224 1225/* 1226 * Handle synchronization requests. 1227 * Every synchronization request is two-steps process: first, READ request is 1228 * send to active provider and then WRITE request (with read data) to the provider 1229 * beeing synchronized. When WRITE is finished, new synchronization request is 1230 * send. 1231 */ 1232static void 1233g_mirror_sync_request(struct bio *bp) 1234{ 1235 struct g_mirror_softc *sc; 1236 struct g_mirror_disk *disk; 1237 1238 bp->bio_from->index--; 1239 sc = bp->bio_from->geom->softc; 1240 disk = bp->bio_from->private; 1241 if (disk == NULL) { 1242 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 1243 g_topology_lock(); 1244 g_mirror_kill_consumer(sc, bp->bio_from); 1245 g_topology_unlock(); 1246 free(bp->bio_data, M_MIRROR); 1247 g_destroy_bio(bp); 1248 sx_xlock(&sc->sc_lock); 1249 return; 1250 } 1251 1252 /* 1253 * Synchronization request. 1254 */ 1255 switch (bp->bio_cmd) { 1256 case BIO_READ: 1257 { 1258 struct g_consumer *cp; 1259 1260 if (bp->bio_error != 0) { 1261 G_MIRROR_LOGREQ(0, bp, 1262 "Synchronization request failed (error=%d).", 1263 bp->bio_error); 1264 g_destroy_bio(bp); 1265 return; 1266 } 1267 G_MIRROR_LOGREQ(3, bp, 1268 "Synchronization request half-finished."); 1269 bp->bio_cmd = BIO_WRITE; 1270 bp->bio_cflags = 0; 1271 cp = disk->d_consumer; 1272 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1273 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1274 cp->acr, cp->acw, cp->ace)); 1275 cp->index++; 1276 g_io_request(bp, cp); 1277 return; 1278 } 1279 case BIO_WRITE: 1280 { 1281 struct g_mirror_disk_sync *sync; 1282 off_t offset; 1283 void *data; 1284 int i; 1285 1286 if (bp->bio_error != 0) { 1287 G_MIRROR_LOGREQ(0, bp, 1288 "Synchronization request failed (error=%d).", 1289 bp->bio_error); 1290 g_destroy_bio(bp); 1291 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 1292 g_mirror_event_send(disk, 1293 G_MIRROR_DISK_STATE_DISCONNECTED, 1294 G_MIRROR_EVENT_DONTWAIT); 1295 return; 1296 } 1297 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished."); 1298 sync = &disk->d_sync; 1299 if (sync->ds_offset == sc->sc_mediasize || 1300 sync->ds_consumer == NULL || 1301 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1302 /* Don't send more synchronization requests. */ 1303 sync->ds_inflight--; 1304 if (sync->ds_bios != NULL) { 1305 i = (int)(uintptr_t)bp->bio_caller1; 1306 sync->ds_bios[i] = NULL; 1307 } 1308 free(bp->bio_data, M_MIRROR); 1309 g_destroy_bio(bp); 1310 if (sync->ds_inflight > 0) 1311 return; 1312 if (sync->ds_consumer == NULL || 1313 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1314 return; 1315 } 1316 /* Disk up-to-date, activate it. */ 1317 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE, 1318 G_MIRROR_EVENT_DONTWAIT); 1319 return; 1320 } 1321 1322 /* Send next synchronization request. */ 1323 data = bp->bio_data; 1324 bzero(bp, sizeof(*bp)); 1325 bp->bio_cmd = BIO_READ; 1326 bp->bio_offset = sync->ds_offset; 1327 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset); 1328 sync->ds_offset += bp->bio_length; 1329 bp->bio_done = g_mirror_sync_done; 1330 bp->bio_data = data; 1331 bp->bio_from = sync->ds_consumer; 1332 bp->bio_to = sc->sc_provider; 1333 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 1334 sync->ds_consumer->index++; 1335 /* 1336 * Delay the request if it is colliding with a regular request. 1337 */ 1338 if (g_mirror_regular_collision(sc, bp)) 1339 g_mirror_sync_delay(sc, bp); 1340 else 1341 g_io_request(bp, sync->ds_consumer); 1342 1343 /* Release delayed requests if possible. */ 1344 g_mirror_regular_release(sc); 1345 1346 /* Find the smallest offset */ 1347 offset = sc->sc_mediasize; 1348 for (i = 0; i < g_mirror_syncreqs; i++) { 1349 bp = sync->ds_bios[i]; 1350 if (bp->bio_offset < offset) 1351 offset = bp->bio_offset; 1352 } 1353 if (sync->ds_offset_done + (MAXPHYS * 100) < offset) { 1354 /* Update offset_done on every 100 blocks. */ 1355 sync->ds_offset_done = offset; 1356 g_mirror_update_metadata(disk); 1357 } 1358 return; 1359 } 1360 default: 1361 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1362 bp->bio_cmd, sc->sc_name)); 1363 break; 1364 } 1365} 1366 1367static void 1368g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp) 1369{ 1370 struct g_mirror_disk *disk; 1371 struct g_consumer *cp; 1372 struct bio *cbp; 1373 1374 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1375 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE) 1376 break; 1377 } 1378 if (disk == NULL) { 1379 if (bp->bio_error == 0) 1380 bp->bio_error = ENXIO; 1381 g_io_deliver(bp, bp->bio_error); 1382 return; 1383 } 1384 cbp = g_clone_bio(bp); 1385 if (cbp == NULL) { 1386 if (bp->bio_error == 0) 1387 bp->bio_error = ENOMEM; 1388 g_io_deliver(bp, bp->bio_error); 1389 return; 1390 } 1391 /* 1392 * Fill in the component buf structure. 1393 */ 1394 cp = disk->d_consumer; 1395 cbp->bio_done = g_mirror_done; 1396 cbp->bio_to = cp->provider; 1397 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1398 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1399 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1400 cp->acw, cp->ace)); 1401 cp->index++; 1402 g_io_request(cbp, cp); 1403} 1404 1405static void 1406g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp) 1407{ 1408 struct g_mirror_disk *disk; 1409 struct g_consumer *cp; 1410 struct bio *cbp; 1411 1412 disk = g_mirror_get_disk(sc); 1413 if (disk == NULL) { 1414 if (bp->bio_error == 0) 1415 bp->bio_error = ENXIO; 1416 g_io_deliver(bp, bp->bio_error); 1417 return; 1418 } 1419 cbp = g_clone_bio(bp); 1420 if (cbp == NULL) { 1421 if (bp->bio_error == 0) 1422 bp->bio_error = ENOMEM; 1423 g_io_deliver(bp, bp->bio_error); 1424 return; 1425 } 1426 /* 1427 * Fill in the component buf structure. 1428 */ 1429 cp = disk->d_consumer; 1430 cbp->bio_done = g_mirror_done; 1431 cbp->bio_to = cp->provider; 1432 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1433 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1434 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1435 cp->acw, cp->ace)); 1436 cp->index++; 1437 g_io_request(cbp, cp); 1438} 1439 1440#define TRACK_SIZE (1 * 1024 * 1024) 1441#define LOAD_SCALE 256 1442#define ABS(x) (((x) >= 0) ? (x) : (-(x))) 1443 1444static void 1445g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp) 1446{ 1447 struct g_mirror_disk *disk, *dp; 1448 struct g_consumer *cp; 1449 struct bio *cbp; 1450 int prio, best; 1451 1452 /* Find a disk with the smallest load. */ 1453 disk = NULL; 1454 best = INT_MAX; 1455 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1456 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1457 continue; 1458 prio = dp->load; 1459 /* If disk head is precisely in position - highly prefer it. */ 1460 if (dp->d_last_offset == bp->bio_offset) 1461 prio -= 2 * LOAD_SCALE; 1462 else 1463 /* If disk head is close to position - prefer it. */ 1464 if (ABS(dp->d_last_offset - bp->bio_offset) < TRACK_SIZE) 1465 prio -= 1 * LOAD_SCALE; 1466 if (prio <= best) { 1467 disk = dp; 1468 best = prio; 1469 } 1470 } 1471 KASSERT(disk != NULL, ("NULL disk for %s.", sc->sc_name)); 1472 cbp = g_clone_bio(bp); 1473 if (cbp == NULL) { 1474 if (bp->bio_error == 0) 1475 bp->bio_error = ENOMEM; 1476 g_io_deliver(bp, bp->bio_error); 1477 return; 1478 } 1479 /* 1480 * Fill in the component buf structure. 1481 */ 1482 cp = disk->d_consumer; 1483 cbp->bio_done = g_mirror_done; 1484 cbp->bio_to = cp->provider; 1485 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1486 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1487 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1488 cp->acw, cp->ace)); 1489 cp->index++; 1490 /* Remember last head position */ 1491 disk->d_last_offset = bp->bio_offset + bp->bio_length; 1492 /* Update loads. */ 1493 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1494 dp->load = (dp->d_consumer->index * LOAD_SCALE + 1495 dp->load * 7) / 8; 1496 } 1497 g_io_request(cbp, cp); 1498} 1499 1500static void 1501g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp) 1502{ 1503 struct bio_queue_head queue; 1504 struct g_mirror_disk *disk; 1505 struct g_consumer *cp; 1506 struct bio *cbp; 1507 off_t left, mod, offset, slice; 1508 u_char *data; 1509 u_int ndisks; 1510 1511 if (bp->bio_length <= sc->sc_slice) { 1512 g_mirror_request_round_robin(sc, bp); 1513 return; 1514 } 1515 ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE); 1516 slice = bp->bio_length / ndisks; 1517 mod = slice % sc->sc_provider->sectorsize; 1518 if (mod != 0) 1519 slice += sc->sc_provider->sectorsize - mod; 1520 /* 1521 * Allocate all bios before sending any request, so we can 1522 * return ENOMEM in nice and clean way. 1523 */ 1524 left = bp->bio_length; 1525 offset = bp->bio_offset; 1526 data = bp->bio_data; 1527 bioq_init(&queue); 1528 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1529 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1530 continue; 1531 cbp = g_clone_bio(bp); 1532 if (cbp == NULL) { 1533 for (cbp = bioq_first(&queue); cbp != NULL; 1534 cbp = bioq_first(&queue)) { 1535 bioq_remove(&queue, cbp); 1536 g_destroy_bio(cbp); 1537 } 1538 if (bp->bio_error == 0) 1539 bp->bio_error = ENOMEM; 1540 g_io_deliver(bp, bp->bio_error); 1541 return; 1542 } 1543 bioq_insert_tail(&queue, cbp); 1544 cbp->bio_done = g_mirror_done; 1545 cbp->bio_caller1 = disk; 1546 cbp->bio_to = disk->d_consumer->provider; 1547 cbp->bio_offset = offset; 1548 cbp->bio_data = data; 1549 cbp->bio_length = MIN(left, slice); 1550 left -= cbp->bio_length; 1551 if (left == 0) 1552 break; 1553 offset += cbp->bio_length; 1554 data += cbp->bio_length; 1555 } 1556 for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) { 1557 bioq_remove(&queue, cbp); 1558 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1559 disk = cbp->bio_caller1; 1560 cbp->bio_caller1 = NULL; 1561 cp = disk->d_consumer; 1562 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1563 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1564 cp->acr, cp->acw, cp->ace)); 1565 disk->d_consumer->index++; 1566 g_io_request(cbp, disk->d_consumer); 1567 } 1568} 1569 1570static void 1571g_mirror_register_request(struct bio *bp) 1572{ 1573 struct g_mirror_softc *sc; 1574 1575 sc = bp->bio_to->geom->softc; 1576 switch (bp->bio_cmd) { 1577 case BIO_READ: 1578 switch (sc->sc_balance) { 1579 case G_MIRROR_BALANCE_LOAD: 1580 g_mirror_request_load(sc, bp); 1581 break; 1582 case G_MIRROR_BALANCE_PREFER: 1583 g_mirror_request_prefer(sc, bp); 1584 break; 1585 case G_MIRROR_BALANCE_ROUND_ROBIN: 1586 g_mirror_request_round_robin(sc, bp); 1587 break; 1588 case G_MIRROR_BALANCE_SPLIT: 1589 g_mirror_request_split(sc, bp); 1590 break; 1591 } 1592 return; 1593 case BIO_WRITE: 1594 case BIO_DELETE: 1595 { 1596 struct g_mirror_disk *disk; 1597 struct g_mirror_disk_sync *sync; 1598 struct bio_queue_head queue; 1599 struct g_consumer *cp; 1600 struct bio *cbp; 1601 1602 /* 1603 * Delay the request if it is colliding with a synchronization 1604 * request. 1605 */ 1606 if (g_mirror_sync_collision(sc, bp)) { 1607 g_mirror_regular_delay(sc, bp); 1608 return; 1609 } 1610 1611 if (sc->sc_idle) 1612 g_mirror_unidle(sc); 1613 else 1614 sc->sc_last_write = time_uptime; 1615 1616 /* 1617 * Allocate all bios before sending any request, so we can 1618 * return ENOMEM in nice and clean way. 1619 */ 1620 bioq_init(&queue); 1621 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1622 sync = &disk->d_sync; 1623 switch (disk->d_state) { 1624 case G_MIRROR_DISK_STATE_ACTIVE: 1625 break; 1626 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 1627 if (bp->bio_offset >= sync->ds_offset) 1628 continue; 1629 break; 1630 default: 1631 continue; 1632 } 1633 cbp = g_clone_bio(bp); 1634 if (cbp == NULL) { 1635 for (cbp = bioq_first(&queue); cbp != NULL; 1636 cbp = bioq_first(&queue)) { 1637 bioq_remove(&queue, cbp); 1638 g_destroy_bio(cbp); 1639 } 1640 if (bp->bio_error == 0) 1641 bp->bio_error = ENOMEM; 1642 g_io_deliver(bp, bp->bio_error); 1643 return; 1644 } 1645 bioq_insert_tail(&queue, cbp); 1646 cbp->bio_done = g_mirror_done; 1647 cp = disk->d_consumer; 1648 cbp->bio_caller1 = cp; 1649 cbp->bio_to = cp->provider; 1650 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1651 ("Consumer %s not opened (r%dw%de%d).", 1652 cp->provider->name, cp->acr, cp->acw, cp->ace)); 1653 } 1654 for (cbp = bioq_first(&queue); cbp != NULL; 1655 cbp = bioq_first(&queue)) { 1656 bioq_remove(&queue, cbp); 1657 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1658 cp = cbp->bio_caller1; 1659 cbp->bio_caller1 = NULL; 1660 cp->index++; 1661 sc->sc_writes++; 1662 g_io_request(cbp, cp); 1663 } 1664 /* 1665 * Put request onto inflight queue, so we can check if new 1666 * synchronization requests don't collide with it. 1667 */ 1668 bioq_insert_tail(&sc->sc_inflight, bp); 1669 /* 1670 * Bump syncid on first write. 1671 */ 1672 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) { 1673 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 1674 g_mirror_bump_syncid(sc); 1675 } 1676 return; 1677 } 1678 default: 1679 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1680 bp->bio_cmd, sc->sc_name)); 1681 break; 1682 } 1683} 1684 1685static int 1686g_mirror_can_destroy(struct g_mirror_softc *sc) 1687{ 1688 struct g_geom *gp; 1689 struct g_consumer *cp; 1690 1691 g_topology_assert(); 1692 gp = sc->sc_geom; 1693 if (gp->softc == NULL) 1694 return (1); 1695 LIST_FOREACH(cp, &gp->consumer, consumer) { 1696 if (g_mirror_is_busy(sc, cp)) 1697 return (0); 1698 } 1699 gp = sc->sc_sync.ds_geom; 1700 LIST_FOREACH(cp, &gp->consumer, consumer) { 1701 if (g_mirror_is_busy(sc, cp)) 1702 return (0); 1703 } 1704 G_MIRROR_DEBUG(2, "No I/O requests for %s, it can be destroyed.", 1705 sc->sc_name); 1706 return (1); 1707} 1708 1709static int 1710g_mirror_try_destroy(struct g_mirror_softc *sc) 1711{ 1712 1713 if (sc->sc_rootmount != NULL) { 1714 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 1715 sc->sc_rootmount); 1716 root_mount_rel(sc->sc_rootmount); 1717 sc->sc_rootmount = NULL; 1718 } 1719 g_topology_lock(); 1720 if (!g_mirror_can_destroy(sc)) { 1721 g_topology_unlock(); 1722 return (0); 1723 } 1724 sc->sc_geom->softc = NULL; 1725 sc->sc_sync.ds_geom->softc = NULL; 1726 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WAIT) != 0) { 1727 g_topology_unlock(); 1728 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1729 &sc->sc_worker); 1730 /* Unlock sc_lock here, as it can be destroyed after wakeup. */ 1731 sx_xunlock(&sc->sc_lock); 1732 wakeup(&sc->sc_worker); 1733 sc->sc_worker = NULL; 1734 } else { 1735 g_topology_unlock(); 1736 g_mirror_destroy_device(sc); 1737 free(sc, M_MIRROR); 1738 } 1739 return (1); 1740} 1741 1742/* 1743 * Worker thread. 1744 */ 1745static void 1746g_mirror_worker(void *arg) 1747{ 1748 struct g_mirror_softc *sc; 1749 struct g_mirror_event *ep; 1750 struct bio *bp; 1751 int timeout; 1752 1753 sc = arg; 1754 thread_lock(curthread); 1755 sched_prio(curthread, PRIBIO); 1756 thread_unlock(curthread); 1757 1758 sx_xlock(&sc->sc_lock); 1759 for (;;) { 1760 G_MIRROR_DEBUG(5, "%s: Let's see...", __func__); 1761 /* 1762 * First take a look at events. 1763 * This is important to handle events before any I/O requests. 1764 */ 1765 ep = g_mirror_event_get(sc); 1766 if (ep != NULL) { 1767 g_mirror_event_remove(sc, ep); 1768 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) { 1769 /* Update only device status. */ 1770 G_MIRROR_DEBUG(3, 1771 "Running event for device %s.", 1772 sc->sc_name); 1773 ep->e_error = 0; 1774 g_mirror_update_device(sc, 1); 1775 } else { 1776 /* Update disk status. */ 1777 G_MIRROR_DEBUG(3, "Running event for disk %s.", 1778 g_mirror_get_diskname(ep->e_disk)); 1779 ep->e_error = g_mirror_update_disk(ep->e_disk, 1780 ep->e_state); 1781 if (ep->e_error == 0) 1782 g_mirror_update_device(sc, 0); 1783 } 1784 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) { 1785 KASSERT(ep->e_error == 0, 1786 ("Error cannot be handled.")); 1787 g_mirror_event_free(ep); 1788 } else { 1789 ep->e_flags |= G_MIRROR_EVENT_DONE; 1790 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1791 ep); 1792 mtx_lock(&sc->sc_events_mtx); 1793 wakeup(ep); 1794 mtx_unlock(&sc->sc_events_mtx); 1795 } 1796 if ((sc->sc_flags & 1797 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1798 if (g_mirror_try_destroy(sc)) { 1799 curthread->td_pflags &= ~TDP_GEOM; 1800 G_MIRROR_DEBUG(1, "Thread exiting."); 1801 kproc_exit(0); 1802 } 1803 } 1804 G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__); 1805 continue; 1806 } 1807 /* 1808 * Check if we can mark array as CLEAN and if we can't take 1809 * how much seconds should we wait. 1810 */ 1811 timeout = g_mirror_idle(sc, -1); 1812 /* 1813 * Now I/O requests. 1814 */ 1815 /* Get first request from the queue. */ 1816 mtx_lock(&sc->sc_queue_mtx); 1817 bp = bioq_first(&sc->sc_queue); 1818 if (bp == NULL) { 1819 if ((sc->sc_flags & 1820 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1821 mtx_unlock(&sc->sc_queue_mtx); 1822 if (g_mirror_try_destroy(sc)) { 1823 curthread->td_pflags &= ~TDP_GEOM; 1824 G_MIRROR_DEBUG(1, "Thread exiting."); 1825 kproc_exit(0); 1826 } 1827 mtx_lock(&sc->sc_queue_mtx); 1828 } 1829 sx_xunlock(&sc->sc_lock); 1830 /* 1831 * XXX: We can miss an event here, because an event 1832 * can be added without sx-device-lock and without 1833 * mtx-queue-lock. Maybe I should just stop using 1834 * dedicated mutex for events synchronization and 1835 * stick with the queue lock? 1836 * The event will hang here until next I/O request 1837 * or next event is received. 1838 */ 1839 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w1", 1840 timeout * hz); 1841 sx_xlock(&sc->sc_lock); 1842 G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__); 1843 continue; 1844 } 1845 bioq_remove(&sc->sc_queue, bp); 1846 mtx_unlock(&sc->sc_queue_mtx); 1847 1848 if (bp->bio_from->geom == sc->sc_sync.ds_geom && 1849 (bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) { 1850 g_mirror_sync_request(bp); /* READ */ 1851 } else if (bp->bio_to != sc->sc_provider) { 1852 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0) 1853 g_mirror_regular_request(bp); 1854 else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 1855 g_mirror_sync_request(bp); /* WRITE */ 1856 else { 1857 KASSERT(0, 1858 ("Invalid request cflags=0x%hhx to=%s.", 1859 bp->bio_cflags, bp->bio_to->name)); 1860 } 1861 } else { 1862 g_mirror_register_request(bp); 1863 } 1864 G_MIRROR_DEBUG(5, "%s: I'm here 9.", __func__); 1865 } 1866} 1867 1868static void 1869g_mirror_update_idle(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 1870{ 1871 1872 sx_assert(&sc->sc_lock, SX_LOCKED); 1873 1874 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 1875 return; 1876 if (!sc->sc_idle && (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) { 1877 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.", 1878 g_mirror_get_diskname(disk), sc->sc_name); 1879 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1880 } else if (sc->sc_idle && 1881 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 1882 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.", 1883 g_mirror_get_diskname(disk), sc->sc_name); 1884 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 1885 } 1886} 1887 1888static void 1889g_mirror_sync_start(struct g_mirror_disk *disk) 1890{ 1891 struct g_mirror_softc *sc; 1892 struct g_consumer *cp; 1893 struct bio *bp; 1894 int error, i; 1895 1896 g_topology_assert_not(); 1897 sc = disk->d_softc; 1898 sx_assert(&sc->sc_lock, SX_LOCKED); 1899 1900 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 1901 ("Disk %s is not marked for synchronization.", 1902 g_mirror_get_diskname(disk))); 1903 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1904 ("Device not in RUNNING state (%s, %u).", sc->sc_name, 1905 sc->sc_state)); 1906 1907 sx_xunlock(&sc->sc_lock); 1908 g_topology_lock(); 1909 cp = g_new_consumer(sc->sc_sync.ds_geom); 1910 error = g_attach(cp, sc->sc_provider); 1911 KASSERT(error == 0, 1912 ("Cannot attach to %s (error=%d).", sc->sc_name, error)); 1913 error = g_access(cp, 1, 0, 0); 1914 KASSERT(error == 0, ("Cannot open %s (error=%d).", sc->sc_name, error)); 1915 g_topology_unlock(); 1916 sx_xlock(&sc->sc_lock); 1917 1918 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name, 1919 g_mirror_get_diskname(disk)); 1920 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) == 0) 1921 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1922 KASSERT(disk->d_sync.ds_consumer == NULL, 1923 ("Sync consumer already exists (device=%s, disk=%s).", 1924 sc->sc_name, g_mirror_get_diskname(disk))); 1925 1926 disk->d_sync.ds_consumer = cp; 1927 disk->d_sync.ds_consumer->private = disk; 1928 disk->d_sync.ds_consumer->index = 0; 1929 1930 /* 1931 * Allocate memory for synchronization bios and initialize them. 1932 */ 1933 disk->d_sync.ds_bios = malloc(sizeof(struct bio *) * g_mirror_syncreqs, 1934 M_MIRROR, M_WAITOK); 1935 for (i = 0; i < g_mirror_syncreqs; i++) { 1936 bp = g_alloc_bio(); 1937 disk->d_sync.ds_bios[i] = bp; 1938 bp->bio_parent = NULL; 1939 bp->bio_cmd = BIO_READ; 1940 bp->bio_data = malloc(MAXPHYS, M_MIRROR, M_WAITOK); 1941 bp->bio_cflags = 0; 1942 bp->bio_offset = disk->d_sync.ds_offset; 1943 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset); 1944 disk->d_sync.ds_offset += bp->bio_length; 1945 bp->bio_done = g_mirror_sync_done; 1946 bp->bio_from = disk->d_sync.ds_consumer; 1947 bp->bio_to = sc->sc_provider; 1948 bp->bio_caller1 = (void *)(uintptr_t)i; 1949 } 1950 1951 /* Increase the number of disks in SYNCHRONIZING state. */ 1952 sc->sc_sync.ds_ndisks++; 1953 /* Set the number of in-flight synchronization requests. */ 1954 disk->d_sync.ds_inflight = g_mirror_syncreqs; 1955 1956 /* 1957 * Fire off first synchronization requests. 1958 */ 1959 for (i = 0; i < g_mirror_syncreqs; i++) { 1960 bp = disk->d_sync.ds_bios[i]; 1961 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 1962 disk->d_sync.ds_consumer->index++; 1963 /* 1964 * Delay the request if it is colliding with a regular request. 1965 */ 1966 if (g_mirror_regular_collision(sc, bp)) 1967 g_mirror_sync_delay(sc, bp); 1968 else 1969 g_io_request(bp, disk->d_sync.ds_consumer); 1970 } 1971} 1972 1973/* 1974 * Stop synchronization process. 1975 * type: 0 - synchronization finished 1976 * 1 - synchronization stopped 1977 */ 1978static void 1979g_mirror_sync_stop(struct g_mirror_disk *disk, int type) 1980{ 1981 struct g_mirror_softc *sc; 1982 struct g_consumer *cp; 1983 1984 g_topology_assert_not(); 1985 sc = disk->d_softc; 1986 sx_assert(&sc->sc_lock, SX_LOCKED); 1987 1988 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 1989 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 1990 g_mirror_disk_state2str(disk->d_state))); 1991 if (disk->d_sync.ds_consumer == NULL) 1992 return; 1993 1994 if (type == 0) { 1995 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.", 1996 sc->sc_name, g_mirror_get_diskname(disk)); 1997 } else /* if (type == 1) */ { 1998 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.", 1999 sc->sc_name, g_mirror_get_diskname(disk)); 2000 } 2001 free(disk->d_sync.ds_bios, M_MIRROR); 2002 disk->d_sync.ds_bios = NULL; 2003 cp = disk->d_sync.ds_consumer; 2004 disk->d_sync.ds_consumer = NULL; 2005 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2006 sc->sc_sync.ds_ndisks--; 2007 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 2008 g_topology_lock(); 2009 g_mirror_kill_consumer(sc, cp); 2010 g_topology_unlock(); 2011 sx_xlock(&sc->sc_lock); 2012} 2013 2014static void 2015g_mirror_launch_provider(struct g_mirror_softc *sc) 2016{ 2017 struct g_mirror_disk *disk; 2018 struct g_provider *pp; 2019 2020 sx_assert(&sc->sc_lock, SX_LOCKED); 2021 2022 g_topology_lock(); 2023 pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name); 2024 pp->mediasize = sc->sc_mediasize; 2025 pp->sectorsize = sc->sc_sectorsize; 2026 pp->stripesize = 0; 2027 pp->stripeoffset = 0; 2028 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2029 if (disk->d_consumer && disk->d_consumer->provider && 2030 disk->d_consumer->provider->stripesize > pp->stripesize) { 2031 pp->stripesize = disk->d_consumer->provider->stripesize; 2032 pp->stripeoffset = disk->d_consumer->provider->stripeoffset; 2033 } 2034 } 2035 sc->sc_provider = pp; 2036 g_error_provider(pp, 0); 2037 g_topology_unlock(); 2038 G_MIRROR_DEBUG(0, "Device %s launched (%u/%u).", pp->name, 2039 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE), sc->sc_ndisks); 2040 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2041 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2042 g_mirror_sync_start(disk); 2043 } 2044} 2045 2046static void 2047g_mirror_destroy_provider(struct g_mirror_softc *sc) 2048{ 2049 struct g_mirror_disk *disk; 2050 struct bio *bp; 2051 2052 g_topology_assert_not(); 2053 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).", 2054 sc->sc_name)); 2055 2056 g_topology_lock(); 2057 g_error_provider(sc->sc_provider, ENXIO); 2058 mtx_lock(&sc->sc_queue_mtx); 2059 while ((bp = bioq_first(&sc->sc_queue)) != NULL) { 2060 bioq_remove(&sc->sc_queue, bp); 2061 g_io_deliver(bp, ENXIO); 2062 } 2063 mtx_unlock(&sc->sc_queue_mtx); 2064 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", sc->sc_name, 2065 sc->sc_provider->name); 2066 sc->sc_provider->flags |= G_PF_WITHER; 2067 g_orphan_provider(sc->sc_provider, ENXIO); 2068 g_topology_unlock(); 2069 sc->sc_provider = NULL; 2070 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2071 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2072 g_mirror_sync_stop(disk, 1); 2073 } 2074} 2075 2076static void 2077g_mirror_go(void *arg) 2078{ 2079 struct g_mirror_softc *sc; 2080 2081 sc = arg; 2082 G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name); 2083 g_mirror_event_send(sc, 0, 2084 G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE); 2085} 2086 2087static u_int 2088g_mirror_determine_state(struct g_mirror_disk *disk) 2089{ 2090 struct g_mirror_softc *sc; 2091 u_int state; 2092 2093 sc = disk->d_softc; 2094 if (sc->sc_syncid == disk->d_sync.ds_syncid) { 2095 if ((disk->d_flags & 2096 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2097 /* Disk does not need synchronization. */ 2098 state = G_MIRROR_DISK_STATE_ACTIVE; 2099 } else { 2100 if ((sc->sc_flags & 2101 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2102 (disk->d_flags & 2103 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2104 /* 2105 * We can start synchronization from 2106 * the stored offset. 2107 */ 2108 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2109 } else { 2110 state = G_MIRROR_DISK_STATE_STALE; 2111 } 2112 } 2113 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) { 2114 /* 2115 * Reset all synchronization data for this disk, 2116 * because if it even was synchronized, it was 2117 * synchronized to disks with different syncid. 2118 */ 2119 disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2120 disk->d_sync.ds_offset = 0; 2121 disk->d_sync.ds_offset_done = 0; 2122 disk->d_sync.ds_syncid = sc->sc_syncid; 2123 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2124 (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2125 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2126 } else { 2127 state = G_MIRROR_DISK_STATE_STALE; 2128 } 2129 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ { 2130 /* 2131 * Not good, NOT GOOD! 2132 * It means that mirror was started on stale disks 2133 * and more fresh disk just arrive. 2134 * If there were writes, mirror is broken, sorry. 2135 * I think the best choice here is don't touch 2136 * this disk and inform the user loudly. 2137 */ 2138 G_MIRROR_DEBUG(0, "Device %s was started before the freshest " 2139 "disk (%s) arrives!! It will not be connected to the " 2140 "running device.", sc->sc_name, 2141 g_mirror_get_diskname(disk)); 2142 g_mirror_destroy_disk(disk); 2143 state = G_MIRROR_DISK_STATE_NONE; 2144 /* Return immediately, because disk was destroyed. */ 2145 return (state); 2146 } 2147 G_MIRROR_DEBUG(3, "State for %s disk: %s.", 2148 g_mirror_get_diskname(disk), g_mirror_disk_state2str(state)); 2149 return (state); 2150} 2151 2152/* 2153 * Update device state. 2154 */ 2155static void 2156g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force) 2157{ 2158 struct g_mirror_disk *disk; 2159 u_int state; 2160 2161 sx_assert(&sc->sc_lock, SX_XLOCKED); 2162 2163 switch (sc->sc_state) { 2164 case G_MIRROR_DEVICE_STATE_STARTING: 2165 { 2166 struct g_mirror_disk *pdisk, *tdisk; 2167 u_int dirty, ndisks, genid, syncid; 2168 2169 KASSERT(sc->sc_provider == NULL, 2170 ("Non-NULL provider in STARTING state (%s).", sc->sc_name)); 2171 /* 2172 * Are we ready? We are, if all disks are connected or 2173 * if we have any disks and 'force' is true. 2174 */ 2175 ndisks = g_mirror_ndisks(sc, -1); 2176 if (sc->sc_ndisks == ndisks || (force && ndisks > 0)) { 2177 ; 2178 } else if (ndisks == 0) { 2179 /* 2180 * Disks went down in starting phase, so destroy 2181 * device. 2182 */ 2183 callout_drain(&sc->sc_callout); 2184 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2185 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 2186 sc->sc_rootmount); 2187 root_mount_rel(sc->sc_rootmount); 2188 sc->sc_rootmount = NULL; 2189 return; 2190 } else { 2191 return; 2192 } 2193 2194 /* 2195 * Activate all disks with the biggest syncid. 2196 */ 2197 if (force) { 2198 /* 2199 * If 'force' is true, we have been called due to 2200 * timeout, so don't bother canceling timeout. 2201 */ 2202 ndisks = 0; 2203 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2204 if ((disk->d_flags & 2205 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2206 ndisks++; 2207 } 2208 } 2209 if (ndisks == 0) { 2210 /* No valid disks found, destroy device. */ 2211 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2212 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2213 __LINE__, sc->sc_rootmount); 2214 root_mount_rel(sc->sc_rootmount); 2215 sc->sc_rootmount = NULL; 2216 return; 2217 } 2218 } else { 2219 /* Cancel timeout. */ 2220 callout_drain(&sc->sc_callout); 2221 } 2222 2223 /* 2224 * Find the biggest genid. 2225 */ 2226 genid = 0; 2227 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2228 if (disk->d_genid > genid) 2229 genid = disk->d_genid; 2230 } 2231 sc->sc_genid = genid; 2232 /* 2233 * Remove all disks without the biggest genid. 2234 */ 2235 LIST_FOREACH_SAFE(disk, &sc->sc_disks, d_next, tdisk) { 2236 if (disk->d_genid < genid) { 2237 G_MIRROR_DEBUG(0, 2238 "Component %s (device %s) broken, skipping.", 2239 g_mirror_get_diskname(disk), sc->sc_name); 2240 g_mirror_destroy_disk(disk); 2241 } 2242 } 2243 2244 /* 2245 * Find the biggest syncid. 2246 */ 2247 syncid = 0; 2248 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2249 if (disk->d_sync.ds_syncid > syncid) 2250 syncid = disk->d_sync.ds_syncid; 2251 } 2252 2253 /* 2254 * Here we need to look for dirty disks and if all disks 2255 * with the biggest syncid are dirty, we have to choose 2256 * one with the biggest priority and rebuild the rest. 2257 */ 2258 /* 2259 * Find the number of dirty disks with the biggest syncid. 2260 * Find the number of disks with the biggest syncid. 2261 * While here, find a disk with the biggest priority. 2262 */ 2263 dirty = ndisks = 0; 2264 pdisk = NULL; 2265 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2266 if (disk->d_sync.ds_syncid != syncid) 2267 continue; 2268 if ((disk->d_flags & 2269 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2270 continue; 2271 } 2272 ndisks++; 2273 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 2274 dirty++; 2275 if (pdisk == NULL || 2276 pdisk->d_priority < disk->d_priority) { 2277 pdisk = disk; 2278 } 2279 } 2280 } 2281 if (dirty == 0) { 2282 /* No dirty disks at all, great. */ 2283 } else if (dirty == ndisks) { 2284 /* 2285 * Force synchronization for all dirty disks except one 2286 * with the biggest priority. 2287 */ 2288 KASSERT(pdisk != NULL, ("pdisk == NULL")); 2289 G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a " 2290 "master disk for synchronization.", 2291 g_mirror_get_diskname(pdisk), sc->sc_name); 2292 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2293 if (disk->d_sync.ds_syncid != syncid) 2294 continue; 2295 if ((disk->d_flags & 2296 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2297 continue; 2298 } 2299 KASSERT((disk->d_flags & 2300 G_MIRROR_DISK_FLAG_DIRTY) != 0, 2301 ("Disk %s isn't marked as dirty.", 2302 g_mirror_get_diskname(disk))); 2303 /* Skip the disk with the biggest priority. */ 2304 if (disk == pdisk) 2305 continue; 2306 disk->d_sync.ds_syncid = 0; 2307 } 2308 } else if (dirty < ndisks) { 2309 /* 2310 * Force synchronization for all dirty disks. 2311 * We have some non-dirty disks. 2312 */ 2313 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2314 if (disk->d_sync.ds_syncid != syncid) 2315 continue; 2316 if ((disk->d_flags & 2317 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2318 continue; 2319 } 2320 if ((disk->d_flags & 2321 G_MIRROR_DISK_FLAG_DIRTY) == 0) { 2322 continue; 2323 } 2324 disk->d_sync.ds_syncid = 0; 2325 } 2326 } 2327 2328 /* Reset hint. */ 2329 sc->sc_hint = NULL; 2330 sc->sc_syncid = syncid; 2331 if (force) { 2332 /* Remember to bump syncid on first write. */ 2333 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2334 } 2335 state = G_MIRROR_DEVICE_STATE_RUNNING; 2336 G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.", 2337 sc->sc_name, g_mirror_device_state2str(sc->sc_state), 2338 g_mirror_device_state2str(state)); 2339 sc->sc_state = state; 2340 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2341 state = g_mirror_determine_state(disk); 2342 g_mirror_event_send(disk, state, 2343 G_MIRROR_EVENT_DONTWAIT); 2344 if (state == G_MIRROR_DISK_STATE_STALE) 2345 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2346 } 2347 break; 2348 } 2349 case G_MIRROR_DEVICE_STATE_RUNNING: 2350 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 && 2351 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2352 /* 2353 * No active disks or no disks at all, 2354 * so destroy device. 2355 */ 2356 if (sc->sc_provider != NULL) 2357 g_mirror_destroy_provider(sc); 2358 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2359 break; 2360 } else if (g_mirror_ndisks(sc, 2361 G_MIRROR_DISK_STATE_ACTIVE) > 0 && 2362 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2363 /* 2364 * We have active disks, launch provider if it doesn't 2365 * exist. 2366 */ 2367 if (sc->sc_provider == NULL) 2368 g_mirror_launch_provider(sc); 2369 if (sc->sc_rootmount != NULL) { 2370 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2371 __LINE__, sc->sc_rootmount); 2372 root_mount_rel(sc->sc_rootmount); 2373 sc->sc_rootmount = NULL; 2374 } 2375 } 2376 /* 2377 * Genid should be bumped immediately, so do it here. 2378 */ 2379 if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID) != 0) { 2380 sc->sc_bump_id &= ~G_MIRROR_BUMP_GENID; 2381 g_mirror_bump_genid(sc); 2382 } 2383 break; 2384 default: 2385 KASSERT(1 == 0, ("Wrong device state (%s, %s).", 2386 sc->sc_name, g_mirror_device_state2str(sc->sc_state))); 2387 break; 2388 } 2389} 2390 2391/* 2392 * Update disk state and device state if needed. 2393 */ 2394#define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \ 2395 "Disk %s state changed from %s to %s (device %s).", \ 2396 g_mirror_get_diskname(disk), \ 2397 g_mirror_disk_state2str(disk->d_state), \ 2398 g_mirror_disk_state2str(state), sc->sc_name) 2399static int 2400g_mirror_update_disk(struct g_mirror_disk *disk, u_int state) 2401{ 2402 struct g_mirror_softc *sc; 2403 2404 sc = disk->d_softc; 2405 sx_assert(&sc->sc_lock, SX_XLOCKED); 2406 2407again: 2408 G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.", 2409 g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state), 2410 g_mirror_disk_state2str(state)); 2411 switch (state) { 2412 case G_MIRROR_DISK_STATE_NEW: 2413 /* 2414 * Possible scenarios: 2415 * 1. New disk arrive. 2416 */ 2417 /* Previous state should be NONE. */ 2418 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE, 2419 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2420 g_mirror_disk_state2str(disk->d_state))); 2421 DISK_STATE_CHANGED(); 2422 2423 disk->d_state = state; 2424 if (LIST_EMPTY(&sc->sc_disks)) 2425 LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next); 2426 else { 2427 struct g_mirror_disk *dp; 2428 2429 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 2430 if (disk->d_priority >= dp->d_priority) { 2431 LIST_INSERT_BEFORE(dp, disk, d_next); 2432 dp = NULL; 2433 break; 2434 } 2435 if (LIST_NEXT(dp, d_next) == NULL) 2436 break; 2437 } 2438 if (dp != NULL) 2439 LIST_INSERT_AFTER(dp, disk, d_next); 2440 } 2441 G_MIRROR_DEBUG(1, "Device %s: provider %s detected.", 2442 sc->sc_name, g_mirror_get_diskname(disk)); 2443 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 2444 break; 2445 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2446 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2447 g_mirror_device_state2str(sc->sc_state), 2448 g_mirror_get_diskname(disk), 2449 g_mirror_disk_state2str(disk->d_state))); 2450 state = g_mirror_determine_state(disk); 2451 if (state != G_MIRROR_DISK_STATE_NONE) 2452 goto again; 2453 break; 2454 case G_MIRROR_DISK_STATE_ACTIVE: 2455 /* 2456 * Possible scenarios: 2457 * 1. New disk does not need synchronization. 2458 * 2. Synchronization process finished successfully. 2459 */ 2460 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2461 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2462 g_mirror_device_state2str(sc->sc_state), 2463 g_mirror_get_diskname(disk), 2464 g_mirror_disk_state2str(disk->d_state))); 2465 /* Previous state should be NEW or SYNCHRONIZING. */ 2466 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW || 2467 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2468 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2469 g_mirror_disk_state2str(disk->d_state))); 2470 DISK_STATE_CHANGED(); 2471 2472 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2473 disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2474 disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC; 2475 g_mirror_sync_stop(disk, 0); 2476 } 2477 disk->d_state = state; 2478 disk->d_sync.ds_offset = 0; 2479 disk->d_sync.ds_offset_done = 0; 2480 g_mirror_update_idle(sc, disk); 2481 g_mirror_update_metadata(disk); 2482 G_MIRROR_DEBUG(1, "Device %s: provider %s activated.", 2483 sc->sc_name, g_mirror_get_diskname(disk)); 2484 break; 2485 case G_MIRROR_DISK_STATE_STALE: 2486 /* 2487 * Possible scenarios: 2488 * 1. Stale disk was connected. 2489 */ 2490 /* Previous state should be NEW. */ 2491 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2492 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2493 g_mirror_disk_state2str(disk->d_state))); 2494 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2495 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2496 g_mirror_device_state2str(sc->sc_state), 2497 g_mirror_get_diskname(disk), 2498 g_mirror_disk_state2str(disk->d_state))); 2499 /* 2500 * STALE state is only possible if device is marked 2501 * NOAUTOSYNC. 2502 */ 2503 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0, 2504 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2505 g_mirror_device_state2str(sc->sc_state), 2506 g_mirror_get_diskname(disk), 2507 g_mirror_disk_state2str(disk->d_state))); 2508 DISK_STATE_CHANGED(); 2509 2510 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2511 disk->d_state = state; 2512 g_mirror_update_metadata(disk); 2513 G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.", 2514 sc->sc_name, g_mirror_get_diskname(disk)); 2515 break; 2516 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 2517 /* 2518 * Possible scenarios: 2519 * 1. Disk which needs synchronization was connected. 2520 */ 2521 /* Previous state should be NEW. */ 2522 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2523 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2524 g_mirror_disk_state2str(disk->d_state))); 2525 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2526 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2527 g_mirror_device_state2str(sc->sc_state), 2528 g_mirror_get_diskname(disk), 2529 g_mirror_disk_state2str(disk->d_state))); 2530 DISK_STATE_CHANGED(); 2531 2532 if (disk->d_state == G_MIRROR_DISK_STATE_NEW) 2533 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2534 disk->d_state = state; 2535 if (sc->sc_provider != NULL) { 2536 g_mirror_sync_start(disk); 2537 g_mirror_update_metadata(disk); 2538 } 2539 break; 2540 case G_MIRROR_DISK_STATE_DISCONNECTED: 2541 /* 2542 * Possible scenarios: 2543 * 1. Device wasn't running yet, but disk disappear. 2544 * 2. Disk was active and disapppear. 2545 * 3. Disk disappear during synchronization process. 2546 */ 2547 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) { 2548 /* 2549 * Previous state should be ACTIVE, STALE or 2550 * SYNCHRONIZING. 2551 */ 2552 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 2553 disk->d_state == G_MIRROR_DISK_STATE_STALE || 2554 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2555 ("Wrong disk state (%s, %s).", 2556 g_mirror_get_diskname(disk), 2557 g_mirror_disk_state2str(disk->d_state))); 2558 } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) { 2559 /* Previous state should be NEW. */ 2560 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2561 ("Wrong disk state (%s, %s).", 2562 g_mirror_get_diskname(disk), 2563 g_mirror_disk_state2str(disk->d_state))); 2564 /* 2565 * Reset bumping syncid if disk disappeared in STARTING 2566 * state. 2567 */ 2568 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) 2569 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 2570#ifdef INVARIANTS 2571 } else { 2572 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).", 2573 sc->sc_name, 2574 g_mirror_device_state2str(sc->sc_state), 2575 g_mirror_get_diskname(disk), 2576 g_mirror_disk_state2str(disk->d_state))); 2577#endif 2578 } 2579 DISK_STATE_CHANGED(); 2580 G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.", 2581 sc->sc_name, g_mirror_get_diskname(disk)); 2582 2583 g_mirror_destroy_disk(disk); 2584 break; 2585 case G_MIRROR_DISK_STATE_DESTROY: 2586 { 2587 int error; 2588 2589 error = g_mirror_clear_metadata(disk); 2590 if (error != 0) 2591 return (error); 2592 DISK_STATE_CHANGED(); 2593 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", 2594 sc->sc_name, g_mirror_get_diskname(disk)); 2595 2596 g_mirror_destroy_disk(disk); 2597 sc->sc_ndisks--; 2598 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2599 g_mirror_update_metadata(disk); 2600 } 2601 break; 2602 } 2603 default: 2604 KASSERT(1 == 0, ("Unknown state (%u).", state)); 2605 break; 2606 } 2607 return (0); 2608} 2609#undef DISK_STATE_CHANGED 2610 2611int 2612g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md) 2613{ 2614 struct g_provider *pp; 2615 u_char *buf; 2616 int error; 2617 2618 g_topology_assert(); 2619 2620 error = g_access(cp, 1, 0, 0); 2621 if (error != 0) 2622 return (error); 2623 pp = cp->provider; 2624 g_topology_unlock(); 2625 /* Metadata are stored on last sector. */ 2626 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 2627 &error); 2628 g_topology_lock(); 2629 g_access(cp, -1, 0, 0); 2630 if (buf == NULL) { 2631 G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).", 2632 cp->provider->name, error); 2633 return (error); 2634 } 2635 2636 /* Decode metadata. */ 2637 error = mirror_metadata_decode(buf, md); 2638 g_free(buf); 2639 if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0) 2640 return (EINVAL); 2641 if (md->md_version > G_MIRROR_VERSION) { 2642 G_MIRROR_DEBUG(0, 2643 "Kernel module is too old to handle metadata from %s.", 2644 cp->provider->name); 2645 return (EINVAL); 2646 } 2647 if (error != 0) { 2648 G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.", 2649 cp->provider->name); 2650 return (error); 2651 } 2652 2653 return (0); 2654} 2655 2656static int 2657g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp, 2658 struct g_mirror_metadata *md) 2659{ 2660 2661 if (g_mirror_id2disk(sc, md->md_did) != NULL) { 2662 G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.", 2663 pp->name, md->md_did); 2664 return (EEXIST); 2665 } 2666 if (md->md_all != sc->sc_ndisks) { 2667 G_MIRROR_DEBUG(1, 2668 "Invalid '%s' field on disk %s (device %s), skipping.", 2669 "md_all", pp->name, sc->sc_name); 2670 return (EINVAL); 2671 } 2672 if (md->md_slice != sc->sc_slice) { 2673 G_MIRROR_DEBUG(1, 2674 "Invalid '%s' field on disk %s (device %s), skipping.", 2675 "md_slice", pp->name, sc->sc_name); 2676 return (EINVAL); 2677 } 2678 if (md->md_balance != sc->sc_balance) { 2679 G_MIRROR_DEBUG(1, 2680 "Invalid '%s' field on disk %s (device %s), skipping.", 2681 "md_balance", pp->name, sc->sc_name); 2682 return (EINVAL); 2683 } 2684 if (md->md_mediasize != sc->sc_mediasize) { 2685 G_MIRROR_DEBUG(1, 2686 "Invalid '%s' field on disk %s (device %s), skipping.", 2687 "md_mediasize", pp->name, sc->sc_name); 2688 return (EINVAL); 2689 } 2690 if (sc->sc_mediasize > pp->mediasize) { 2691 G_MIRROR_DEBUG(1, 2692 "Invalid size of disk %s (device %s), skipping.", pp->name, 2693 sc->sc_name); 2694 return (EINVAL); 2695 } 2696 if (md->md_sectorsize != sc->sc_sectorsize) { 2697 G_MIRROR_DEBUG(1, 2698 "Invalid '%s' field on disk %s (device %s), skipping.", 2699 "md_sectorsize", pp->name, sc->sc_name); 2700 return (EINVAL); 2701 } 2702 if ((sc->sc_sectorsize % pp->sectorsize) != 0) { 2703 G_MIRROR_DEBUG(1, 2704 "Invalid sector size of disk %s (device %s), skipping.", 2705 pp->name, sc->sc_name); 2706 return (EINVAL); 2707 } 2708 if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) { 2709 G_MIRROR_DEBUG(1, 2710 "Invalid device flags on disk %s (device %s), skipping.", 2711 pp->name, sc->sc_name); 2712 return (EINVAL); 2713 } 2714 if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) { 2715 G_MIRROR_DEBUG(1, 2716 "Invalid disk flags on disk %s (device %s), skipping.", 2717 pp->name, sc->sc_name); 2718 return (EINVAL); 2719 } 2720 return (0); 2721} 2722 2723int 2724g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp, 2725 struct g_mirror_metadata *md) 2726{ 2727 struct g_mirror_disk *disk; 2728 int error; 2729 2730 g_topology_assert_not(); 2731 G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name); 2732 2733 error = g_mirror_check_metadata(sc, pp, md); 2734 if (error != 0) 2735 return (error); 2736 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING && 2737 md->md_genid < sc->sc_genid) { 2738 G_MIRROR_DEBUG(0, "Component %s (device %s) broken, skipping.", 2739 pp->name, sc->sc_name); 2740 return (EINVAL); 2741 } 2742 disk = g_mirror_init_disk(sc, pp, md, &error); 2743 if (disk == NULL) 2744 return (error); 2745 error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW, 2746 G_MIRROR_EVENT_WAIT); 2747 if (error != 0) 2748 return (error); 2749 if (md->md_version < G_MIRROR_VERSION) { 2750 G_MIRROR_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).", 2751 pp->name, md->md_version, G_MIRROR_VERSION); 2752 g_mirror_update_metadata(disk); 2753 } 2754 return (0); 2755} 2756 2757static void 2758g_mirror_destroy_delayed(void *arg, int flag) 2759{ 2760 struct g_mirror_softc *sc; 2761 int error; 2762 2763 if (flag == EV_CANCEL) { 2764 G_MIRROR_DEBUG(1, "Destroying canceled."); 2765 return; 2766 } 2767 sc = arg; 2768 g_topology_unlock(); 2769 sx_xlock(&sc->sc_lock); 2770 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) == 0, 2771 ("DESTROY flag set on %s.", sc->sc_name)); 2772 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0, 2773 ("DESTROYING flag not set on %s.", sc->sc_name)); 2774 G_MIRROR_DEBUG(1, "Destroying %s (delayed).", sc->sc_name); 2775 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_SOFT); 2776 if (error != 0) { 2777 G_MIRROR_DEBUG(0, "Cannot destroy %s.", sc->sc_name); 2778 sx_xunlock(&sc->sc_lock); 2779 } 2780 g_topology_lock(); 2781} 2782 2783static int 2784g_mirror_access(struct g_provider *pp, int acr, int acw, int ace) 2785{ 2786 struct g_mirror_softc *sc; 2787 int dcr, dcw, dce, error = 0; 2788 2789 g_topology_assert(); 2790 G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr, 2791 acw, ace); 2792 2793 sc = pp->geom->softc; 2794 if (sc == NULL && acr <= 0 && acw <= 0 && ace <= 0) 2795 return (0); 2796 KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name)); 2797 2798 dcr = pp->acr + acr; 2799 dcw = pp->acw + acw; 2800 dce = pp->ace + ace; 2801 2802 g_topology_unlock(); 2803 sx_xlock(&sc->sc_lock); 2804 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0 || 2805 LIST_EMPTY(&sc->sc_disks)) { 2806 if (acr > 0 || acw > 0 || ace > 0) 2807 error = ENXIO; 2808 goto end; 2809 } 2810 if (dcw == 0 && !sc->sc_idle) 2811 g_mirror_idle(sc, dcw); 2812 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0) { 2813 if (acr > 0 || acw > 0 || ace > 0) { 2814 error = ENXIO; 2815 goto end; 2816 } 2817 if (dcr == 0 && dcw == 0 && dce == 0) { 2818 g_post_event(g_mirror_destroy_delayed, sc, M_WAITOK, 2819 sc, NULL); 2820 } 2821 } 2822end: 2823 sx_xunlock(&sc->sc_lock); 2824 g_topology_lock(); 2825 return (error); 2826} 2827 2828static struct g_geom * 2829g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md) 2830{ 2831 struct g_mirror_softc *sc; 2832 struct g_geom *gp; 2833 int error, timeout; 2834 2835 g_topology_assert(); 2836 G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name, 2837 md->md_mid); 2838 2839 /* One disk is minimum. */ 2840 if (md->md_all < 1) 2841 return (NULL); 2842 /* 2843 * Action geom. 2844 */ 2845 gp = g_new_geomf(mp, "%s", md->md_name); 2846 sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO); 2847 gp->start = g_mirror_start; 2848 gp->orphan = g_mirror_orphan; 2849 gp->access = g_mirror_access; 2850 gp->dumpconf = g_mirror_dumpconf; 2851 2852 sc->sc_id = md->md_mid; 2853 sc->sc_slice = md->md_slice; 2854 sc->sc_balance = md->md_balance; 2855 sc->sc_mediasize = md->md_mediasize; 2856 sc->sc_sectorsize = md->md_sectorsize; 2857 sc->sc_ndisks = md->md_all; 2858 sc->sc_flags = md->md_mflags; 2859 sc->sc_bump_id = 0; 2860 sc->sc_idle = 1; 2861 sc->sc_last_write = time_uptime; 2862 sc->sc_writes = 0; 2863 sx_init(&sc->sc_lock, "gmirror:lock"); 2864 bioq_init(&sc->sc_queue); 2865 mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF); 2866 bioq_init(&sc->sc_regular_delayed); 2867 bioq_init(&sc->sc_inflight); 2868 bioq_init(&sc->sc_sync_delayed); 2869 LIST_INIT(&sc->sc_disks); 2870 TAILQ_INIT(&sc->sc_events); 2871 mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF); 2872 callout_init(&sc->sc_callout, CALLOUT_MPSAFE); 2873 sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING; 2874 gp->softc = sc; 2875 sc->sc_geom = gp; 2876 sc->sc_provider = NULL; 2877 /* 2878 * Synchronization geom. 2879 */ 2880 gp = g_new_geomf(mp, "%s.sync", md->md_name); 2881 gp->softc = sc; 2882 gp->orphan = g_mirror_orphan; 2883 sc->sc_sync.ds_geom = gp; 2884 sc->sc_sync.ds_ndisks = 0; 2885 error = kproc_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0, 2886 "g_mirror %s", md->md_name); 2887 if (error != 0) { 2888 G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.", 2889 sc->sc_name); 2890 g_destroy_geom(sc->sc_sync.ds_geom); 2891 mtx_destroy(&sc->sc_events_mtx); 2892 mtx_destroy(&sc->sc_queue_mtx); 2893 sx_destroy(&sc->sc_lock); 2894 g_destroy_geom(sc->sc_geom); 2895 free(sc, M_MIRROR); 2896 return (NULL); 2897 } 2898 2899 G_MIRROR_DEBUG(1, "Device %s created (%u components, id=%u).", 2900 sc->sc_name, sc->sc_ndisks, sc->sc_id); 2901 2902 sc->sc_rootmount = root_mount_hold("GMIRROR"); 2903 G_MIRROR_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount); 2904 /* 2905 * Run timeout. 2906 */ 2907 timeout = g_mirror_timeout * hz; 2908 callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc); 2909 return (sc->sc_geom); 2910} 2911 2912int 2913g_mirror_destroy(struct g_mirror_softc *sc, int how) 2914{ 2915 struct g_mirror_disk *disk; 2916 struct g_provider *pp; 2917 2918 g_topology_assert_not(); 2919 if (sc == NULL) 2920 return (ENXIO); 2921 sx_assert(&sc->sc_lock, SX_XLOCKED); 2922 2923 pp = sc->sc_provider; 2924 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 2925 switch (how) { 2926 case G_MIRROR_DESTROY_SOFT: 2927 G_MIRROR_DEBUG(1, 2928 "Device %s is still open (r%dw%de%d).", pp->name, 2929 pp->acr, pp->acw, pp->ace); 2930 return (EBUSY); 2931 case G_MIRROR_DESTROY_DELAYED: 2932 G_MIRROR_DEBUG(1, 2933 "Device %s will be destroyed on last close.", 2934 pp->name); 2935 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2936 if (disk->d_state == 2937 G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2938 g_mirror_sync_stop(disk, 1); 2939 } 2940 } 2941 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROYING; 2942 return (EBUSY); 2943 case G_MIRROR_DESTROY_HARD: 2944 G_MIRROR_DEBUG(1, "Device %s is still open, so it " 2945 "can't be definitely removed.", pp->name); 2946 } 2947 } 2948 2949 g_topology_lock(); 2950 if (sc->sc_geom->softc == NULL) { 2951 g_topology_unlock(); 2952 return (0); 2953 } 2954 sc->sc_geom->softc = NULL; 2955 sc->sc_sync.ds_geom->softc = NULL; 2956 g_topology_unlock(); 2957 2958 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2959 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_WAIT; 2960 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 2961 sx_xunlock(&sc->sc_lock); 2962 mtx_lock(&sc->sc_queue_mtx); 2963 wakeup(sc); 2964 mtx_unlock(&sc->sc_queue_mtx); 2965 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker); 2966 while (sc->sc_worker != NULL) 2967 tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5); 2968 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker); 2969 sx_xlock(&sc->sc_lock); 2970 g_mirror_destroy_device(sc); 2971 free(sc, M_MIRROR); 2972 return (0); 2973} 2974 2975static void 2976g_mirror_taste_orphan(struct g_consumer *cp) 2977{ 2978 2979 KASSERT(1 == 0, ("%s called while tasting %s.", __func__, 2980 cp->provider->name)); 2981} 2982 2983static struct g_geom * 2984g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 2985{ 2986 struct g_mirror_metadata md; 2987 struct g_mirror_softc *sc; 2988 struct g_consumer *cp; 2989 struct g_geom *gp; 2990 int error; 2991 2992 g_topology_assert(); 2993 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 2994 G_MIRROR_DEBUG(2, "Tasting %s.", pp->name); 2995 2996 gp = g_new_geomf(mp, "mirror:taste"); 2997 /* 2998 * This orphan function should be never called. 2999 */ 3000 gp->orphan = g_mirror_taste_orphan; 3001 cp = g_new_consumer(gp); 3002 g_attach(cp, pp); 3003 error = g_mirror_read_metadata(cp, &md); 3004 g_detach(cp); 3005 g_destroy_consumer(cp); 3006 g_destroy_geom(gp); 3007 if (error != 0) 3008 return (NULL); 3009 gp = NULL; 3010 3011 if (md.md_provider[0] != '\0' && 3012 !g_compare_names(md.md_provider, pp->name)) 3013 return (NULL); 3014 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize) 3015 return (NULL); 3016 if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) { 3017 G_MIRROR_DEBUG(0, 3018 "Device %s: provider %s marked as inactive, skipping.", 3019 md.md_name, pp->name); 3020 return (NULL); 3021 } 3022 if (g_mirror_debug >= 2) 3023 mirror_metadata_dump(&md); 3024 3025 /* 3026 * Let's check if device already exists. 3027 */ 3028 sc = NULL; 3029 LIST_FOREACH(gp, &mp->geom, geom) { 3030 sc = gp->softc; 3031 if (sc == NULL) 3032 continue; 3033 if (sc->sc_sync.ds_geom == gp) 3034 continue; 3035 if (strcmp(md.md_name, sc->sc_name) != 0) 3036 continue; 3037 if (md.md_mid != sc->sc_id) { 3038 G_MIRROR_DEBUG(0, "Device %s already configured.", 3039 sc->sc_name); 3040 return (NULL); 3041 } 3042 break; 3043 } 3044 if (gp == NULL) { 3045 gp = g_mirror_create(mp, &md); 3046 if (gp == NULL) { 3047 G_MIRROR_DEBUG(0, "Cannot create device %s.", 3048 md.md_name); 3049 return (NULL); 3050 } 3051 sc = gp->softc; 3052 } 3053 G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name); 3054 g_topology_unlock(); 3055 sx_xlock(&sc->sc_lock); 3056 error = g_mirror_add_disk(sc, pp, &md); 3057 if (error != 0) { 3058 G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).", 3059 pp->name, gp->name, error); 3060 if (LIST_EMPTY(&sc->sc_disks)) { 3061 g_cancel_event(sc); 3062 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3063 g_topology_lock(); 3064 return (NULL); 3065 } 3066 gp = NULL; 3067 } 3068 sx_xunlock(&sc->sc_lock); 3069 g_topology_lock(); 3070 return (gp); 3071} 3072 3073static int 3074g_mirror_destroy_geom(struct gctl_req *req __unused, 3075 struct g_class *mp __unused, struct g_geom *gp) 3076{ 3077 struct g_mirror_softc *sc; 3078 int error; 3079 3080 g_topology_unlock(); 3081 sc = gp->softc; 3082 sx_xlock(&sc->sc_lock); 3083 g_cancel_event(sc); 3084 error = g_mirror_destroy(gp->softc, G_MIRROR_DESTROY_SOFT); 3085 if (error != 0) 3086 sx_xunlock(&sc->sc_lock); 3087 g_topology_lock(); 3088 return (error); 3089} 3090 3091static void 3092g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 3093 struct g_consumer *cp, struct g_provider *pp) 3094{ 3095 struct g_mirror_softc *sc; 3096 3097 g_topology_assert(); 3098 3099 sc = gp->softc; 3100 if (sc == NULL) 3101 return; 3102 /* Skip synchronization geom. */ 3103 if (gp == sc->sc_sync.ds_geom) 3104 return; 3105 if (pp != NULL) { 3106 /* Nothing here. */ 3107 } else if (cp != NULL) { 3108 struct g_mirror_disk *disk; 3109 3110 disk = cp->private; 3111 if (disk == NULL) 3112 return; 3113 g_topology_unlock(); 3114 sx_xlock(&sc->sc_lock); 3115 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id); 3116 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3117 sbuf_printf(sb, "%s<Synchronized>", indent); 3118 if (disk->d_sync.ds_offset == 0) 3119 sbuf_printf(sb, "0%%"); 3120 else { 3121 sbuf_printf(sb, "%u%%", 3122 (u_int)((disk->d_sync.ds_offset * 100) / 3123 sc->sc_provider->mediasize)); 3124 } 3125 sbuf_printf(sb, "</Synchronized>\n"); 3126 } 3127 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, 3128 disk->d_sync.ds_syncid); 3129 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, 3130 disk->d_genid); 3131 sbuf_printf(sb, "%s<Flags>", indent); 3132 if (disk->d_flags == 0) 3133 sbuf_printf(sb, "NONE"); 3134 else { 3135 int first = 1; 3136 3137#define ADD_FLAG(flag, name) do { \ 3138 if ((disk->d_flags & (flag)) != 0) { \ 3139 if (!first) \ 3140 sbuf_printf(sb, ", "); \ 3141 else \ 3142 first = 0; \ 3143 sbuf_printf(sb, name); \ 3144 } \ 3145} while (0) 3146 ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY"); 3147 ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED"); 3148 ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE"); 3149 ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING, 3150 "SYNCHRONIZING"); 3151 ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC"); 3152 ADD_FLAG(G_MIRROR_DISK_FLAG_BROKEN, "BROKEN"); 3153#undef ADD_FLAG 3154 } 3155 sbuf_printf(sb, "</Flags>\n"); 3156 sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent, 3157 disk->d_priority); 3158 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 3159 g_mirror_disk_state2str(disk->d_state)); 3160 sx_xunlock(&sc->sc_lock); 3161 g_topology_lock(); 3162 } else { 3163 g_topology_unlock(); 3164 sx_xlock(&sc->sc_lock); 3165 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id); 3166 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid); 3167 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid); 3168 sbuf_printf(sb, "%s<Flags>", indent); 3169 if (sc->sc_flags == 0) 3170 sbuf_printf(sb, "NONE"); 3171 else { 3172 int first = 1; 3173 3174#define ADD_FLAG(flag, name) do { \ 3175 if ((sc->sc_flags & (flag)) != 0) { \ 3176 if (!first) \ 3177 sbuf_printf(sb, ", "); \ 3178 else \ 3179 first = 0; \ 3180 sbuf_printf(sb, name); \ 3181 } \ 3182} while (0) 3183 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC"); 3184 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC"); 3185#undef ADD_FLAG 3186 } 3187 sbuf_printf(sb, "</Flags>\n"); 3188 sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent, 3189 (u_int)sc->sc_slice); 3190 sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent, 3191 balance_name(sc->sc_balance)); 3192 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent, 3193 sc->sc_ndisks); 3194 sbuf_printf(sb, "%s<State>", indent); 3195 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 3196 sbuf_printf(sb, "%s", "STARTING"); 3197 else if (sc->sc_ndisks == 3198 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE)) 3199 sbuf_printf(sb, "%s", "COMPLETE"); 3200 else 3201 sbuf_printf(sb, "%s", "DEGRADED"); 3202 sbuf_printf(sb, "</State>\n"); 3203 sx_xunlock(&sc->sc_lock); 3204 g_topology_lock(); 3205 } 3206} 3207 3208static void 3209g_mirror_shutdown_pre_sync(void *arg, int howto) 3210{ 3211 struct g_class *mp; 3212 struct g_geom *gp, *gp2; 3213 struct g_mirror_softc *sc; 3214 int error; 3215 3216 mp = arg; 3217 DROP_GIANT(); 3218 g_topology_lock(); 3219 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 3220 if ((sc = gp->softc) == NULL) 3221 continue; 3222 /* Skip synchronization geom. */ 3223 if (gp == sc->sc_sync.ds_geom) 3224 continue; 3225 g_topology_unlock(); 3226 sx_xlock(&sc->sc_lock); 3227 g_cancel_event(sc); 3228 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_DELAYED); 3229 if (error != 0) 3230 sx_xunlock(&sc->sc_lock); 3231 g_topology_lock(); 3232 } 3233 g_topology_unlock(); 3234 PICKUP_GIANT(); 3235} 3236 3237static void 3238g_mirror_init(struct g_class *mp) 3239{ 3240 3241 g_mirror_pre_sync = EVENTHANDLER_REGISTER(shutdown_pre_sync, 3242 g_mirror_shutdown_pre_sync, mp, SHUTDOWN_PRI_FIRST); 3243 if (g_mirror_pre_sync == NULL) 3244 G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event."); 3245} 3246 3247static void 3248g_mirror_fini(struct g_class *mp) 3249{ 3250 3251 if (g_mirror_pre_sync != NULL) 3252 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, g_mirror_pre_sync); 3253} 3254 3255DECLARE_GEOM_CLASS(g_mirror_class, g_mirror); 3256