1 /*- 2 * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/fail.h> 33 #include <sys/kernel.h> 34 #include <sys/module.h> 35 #include <sys/limits.h> 36 #include <sys/lock.h> 37 #include <sys/mutex.h> 38 #include <sys/bio.h> 39 #include <sys/sbuf.h> 40 #include <sys/sysctl.h> 41 #include <sys/malloc.h> 42 #include <sys/eventhandler.h> 43 #include <vm/uma.h> 44 #include <geom/geom.h> 45 #include <sys/proc.h> 46 #include <sys/kthread.h> 47 #include <sys/sched.h> 48 #include <geom/mirror/g_mirror.h> 49 50 FEATURE(geom_mirror, "GEOM mirroring support"); 51 52 static MALLOC_DEFINE(M_MIRROR, "mirror_data", "GEOM_MIRROR Data"); 53 54 SYSCTL_DECL(_kern_geom); 55 static SYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW, 0, 56 "GEOM_MIRROR stuff"); 57 u_int g_mirror_debug = 0; 58 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RWTUN, &g_mirror_debug, 0, 59 "Debug level"); 60 static u_int g_mirror_timeout = 4; 61 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RWTUN, &g_mirror_timeout, 62 0, "Time to wait on all mirror components"); 63 static u_int g_mirror_idletime = 5; 64 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, idletime, CTLFLAG_RWTUN, 65 &g_mirror_idletime, 0, "Mark components as clean when idling"); 66 static u_int g_mirror_disconnect_on_failure = 1; 67 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, disconnect_on_failure, CTLFLAG_RWTUN, 68 &g_mirror_disconnect_on_failure, 0, "Disconnect component on I/O failure."); 69 static u_int g_mirror_syncreqs = 2; 70 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_requests, CTLFLAG_RDTUN, 71 &g_mirror_syncreqs, 0, "Parallel synchronization I/O requests."); 72 73 #define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \ 74 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \ 75 msleep((ident), (mtx), (priority), (wmesg), (timeout)); \ 76 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \ 77 } while (0) 78 79 static eventhandler_tag g_mirror_post_sync = NULL; 80 static int g_mirror_shutdown = 0; 81 82 static g_ctl_destroy_geom_t g_mirror_destroy_geom; 83 static g_taste_t g_mirror_taste; 84 static g_init_t g_mirror_init; 85 static g_fini_t g_mirror_fini; 86 static g_provgone_t g_mirror_providergone; 87 static g_resize_t g_mirror_resize; 88 89 struct g_class g_mirror_class = { 90 .name = G_MIRROR_CLASS_NAME, 91 .version = G_VERSION, 92 .ctlreq = g_mirror_config, 93 .taste = g_mirror_taste, 94 .destroy_geom = g_mirror_destroy_geom, 95 .init = g_mirror_init, 96 .fini = g_mirror_fini, 97 .providergone = g_mirror_providergone, 98 .resize = g_mirror_resize 99 }; 100 101 102 static void g_mirror_destroy_provider(struct g_mirror_softc *sc); 103 static int g_mirror_update_disk(struct g_mirror_disk *disk, u_int state); 104 static void g_mirror_update_device(struct g_mirror_softc *sc, bool force); 105 static void g_mirror_dumpconf(struct sbuf *sb, const char *indent, 106 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp); 107 static void g_mirror_sync_stop(struct g_mirror_disk *disk, int type); 108 static void g_mirror_register_request(struct bio *bp); 109 static void g_mirror_sync_release(struct g_mirror_softc *sc); 110 111 112 static const char * 113 g_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 } 135 136 static const char * 137 g_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 } 149 150 static const char * 151 g_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 */ 164 static void 165 g_mirror_event_free(struct g_mirror_event *ep) 166 { 167 168 free(ep, M_MIRROR); 169 } 170 171 int 172 g_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 } 214 215 static struct g_mirror_event * 216 g_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 } 225 226 static void 227 g_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 } 234 235 static void 236 g_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 */ 265 u_int 266 g_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 */ 283 static struct g_mirror_disk * 284 g_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 } 296 297 static u_int 298 g_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 } 311 312 static int 313 g_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 } 330 331 static void 332 g_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 } 343 344 static void 345 g_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 } 382 383 static int 384 g_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 cp->flags |= G_CF_DIRECT_RECEIVE; 396 error = g_attach(cp, pp); 397 if (error != 0) { 398 g_destroy_consumer(cp); 399 g_topology_unlock(); 400 return (error); 401 } 402 error = g_access(cp, 1, 1, 1); 403 if (error != 0) { 404 g_detach(cp); 405 g_destroy_consumer(cp); 406 g_topology_unlock(); 407 G_MIRROR_DEBUG(0, "Cannot open consumer %s (error=%d).", 408 pp->name, error); 409 return (error); 410 } 411 g_topology_unlock(); 412 disk->d_consumer = cp; 413 disk->d_consumer->private = disk; 414 disk->d_consumer->index = 0; 415 416 G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk)); 417 return (0); 418 } 419 420 static void 421 g_mirror_disconnect_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 422 { 423 424 g_topology_assert(); 425 426 if (cp == NULL) 427 return; 428 if (cp->provider != NULL) 429 g_mirror_kill_consumer(sc, cp); 430 else 431 g_destroy_consumer(cp); 432 } 433 434 /* 435 * Initialize disk. This means allocate memory, create consumer, attach it 436 * to the provider and open access (r1w1e1) to it. 437 */ 438 static struct g_mirror_disk * 439 g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp, 440 struct g_mirror_metadata *md, int *errorp) 441 { 442 struct g_mirror_disk *disk; 443 int i, error; 444 445 disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO); 446 if (disk == NULL) { 447 error = ENOMEM; 448 goto fail; 449 } 450 disk->d_softc = sc; 451 error = g_mirror_connect_disk(disk, pp); 452 if (error != 0) 453 goto fail; 454 disk->d_id = md->md_did; 455 disk->d_state = G_MIRROR_DISK_STATE_NONE; 456 disk->d_priority = md->md_priority; 457 disk->d_flags = md->md_dflags; 458 error = g_getattr("GEOM::candelete", disk->d_consumer, &i); 459 if (error == 0 && i != 0) 460 disk->d_flags |= G_MIRROR_DISK_FLAG_CANDELETE; 461 if (md->md_provider[0] != '\0') 462 disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED; 463 disk->d_sync.ds_consumer = NULL; 464 disk->d_sync.ds_offset = md->md_sync_offset; 465 disk->d_sync.ds_offset_done = md->md_sync_offset; 466 disk->d_genid = md->md_genid; 467 disk->d_sync.ds_syncid = md->md_syncid; 468 if (errorp != NULL) 469 *errorp = 0; 470 return (disk); 471 fail: 472 if (errorp != NULL) 473 *errorp = error; 474 if (disk != NULL) 475 free(disk, M_MIRROR); 476 return (NULL); 477 } 478 479 static void 480 g_mirror_destroy_disk(struct g_mirror_disk *disk) 481 { 482 struct g_mirror_softc *sc; 483 484 g_topology_assert_not(); 485 sc = disk->d_softc; 486 sx_assert(&sc->sc_lock, SX_XLOCKED); 487 488 LIST_REMOVE(disk, d_next); 489 g_mirror_event_cancel(disk); 490 if (sc->sc_hint == disk) 491 sc->sc_hint = NULL; 492 switch (disk->d_state) { 493 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 494 g_mirror_sync_stop(disk, 1); 495 /* FALLTHROUGH */ 496 case G_MIRROR_DISK_STATE_NEW: 497 case G_MIRROR_DISK_STATE_STALE: 498 case G_MIRROR_DISK_STATE_ACTIVE: 499 g_topology_lock(); 500 g_mirror_disconnect_consumer(sc, disk->d_consumer); 501 g_topology_unlock(); 502 free(disk, M_MIRROR); 503 break; 504 default: 505 KASSERT(0 == 1, ("Wrong disk state (%s, %s).", 506 g_mirror_get_diskname(disk), 507 g_mirror_disk_state2str(disk->d_state))); 508 } 509 } 510 511 static void 512 g_mirror_free_device(struct g_mirror_softc *sc) 513 { 514 515 mtx_destroy(&sc->sc_queue_mtx); 516 mtx_destroy(&sc->sc_events_mtx); 517 mtx_destroy(&sc->sc_done_mtx); 518 sx_destroy(&sc->sc_lock); 519 free(sc, M_MIRROR); 520 } 521 522 static void 523 g_mirror_providergone(struct g_provider *pp) 524 { 525 struct g_mirror_softc *sc = pp->private; 526 527 if ((--sc->sc_refcnt) == 0) 528 g_mirror_free_device(sc); 529 } 530 531 static void 532 g_mirror_destroy_device(struct g_mirror_softc *sc) 533 { 534 struct g_mirror_disk *disk; 535 struct g_mirror_event *ep; 536 struct g_geom *gp; 537 struct g_consumer *cp, *tmpcp; 538 539 g_topology_assert_not(); 540 sx_assert(&sc->sc_lock, SX_XLOCKED); 541 542 gp = sc->sc_geom; 543 if (sc->sc_provider != NULL) 544 g_mirror_destroy_provider(sc); 545 for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL; 546 disk = LIST_FIRST(&sc->sc_disks)) { 547 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 548 g_mirror_update_metadata(disk); 549 g_mirror_destroy_disk(disk); 550 } 551 while ((ep = g_mirror_event_get(sc)) != NULL) { 552 g_mirror_event_remove(sc, ep); 553 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 554 g_mirror_event_free(ep); 555 else { 556 ep->e_error = ECANCELED; 557 ep->e_flags |= G_MIRROR_EVENT_DONE; 558 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep); 559 mtx_lock(&sc->sc_events_mtx); 560 wakeup(ep); 561 mtx_unlock(&sc->sc_events_mtx); 562 } 563 } 564 callout_drain(&sc->sc_callout); 565 566 g_topology_lock(); 567 LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) { 568 g_mirror_disconnect_consumer(sc, cp); 569 } 570 g_wither_geom(sc->sc_sync.ds_geom, ENXIO); 571 G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name); 572 g_wither_geom(gp, ENXIO); 573 sx_xunlock(&sc->sc_lock); 574 if ((--sc->sc_refcnt) == 0) 575 g_mirror_free_device(sc); 576 g_topology_unlock(); 577 } 578 579 static void 580 g_mirror_orphan(struct g_consumer *cp) 581 { 582 struct g_mirror_disk *disk; 583 584 g_topology_assert(); 585 586 disk = cp->private; 587 if (disk == NULL) 588 return; 589 disk->d_softc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 590 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 591 G_MIRROR_EVENT_DONTWAIT); 592 } 593 594 /* 595 * Function should return the next active disk on the list. 596 * It is possible that it will be the same disk as given. 597 * If there are no active disks on list, NULL is returned. 598 */ 599 static __inline struct g_mirror_disk * 600 g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 601 { 602 struct g_mirror_disk *dp; 603 604 for (dp = LIST_NEXT(disk, d_next); dp != disk; 605 dp = LIST_NEXT(dp, d_next)) { 606 if (dp == NULL) 607 dp = LIST_FIRST(&sc->sc_disks); 608 if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE) 609 break; 610 } 611 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 612 return (NULL); 613 return (dp); 614 } 615 616 static struct g_mirror_disk * 617 g_mirror_get_disk(struct g_mirror_softc *sc) 618 { 619 struct g_mirror_disk *disk; 620 621 if (sc->sc_hint == NULL) { 622 sc->sc_hint = LIST_FIRST(&sc->sc_disks); 623 if (sc->sc_hint == NULL) 624 return (NULL); 625 } 626 disk = sc->sc_hint; 627 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) { 628 disk = g_mirror_find_next(sc, disk); 629 if (disk == NULL) 630 return (NULL); 631 } 632 sc->sc_hint = g_mirror_find_next(sc, disk); 633 return (disk); 634 } 635 636 static int 637 g_mirror_write_metadata(struct g_mirror_disk *disk, 638 struct g_mirror_metadata *md) 639 { 640 struct g_mirror_softc *sc; 641 struct g_consumer *cp; 642 off_t offset, length; 643 u_char *sector; 644 int error = 0; 645 646 g_topology_assert_not(); 647 sc = disk->d_softc; 648 sx_assert(&sc->sc_lock, SX_LOCKED); 649 650 cp = disk->d_consumer; 651 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name)); 652 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name)); 653 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 654 ("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr, 655 cp->acw, cp->ace)); 656 length = cp->provider->sectorsize; 657 offset = cp->provider->mediasize - length; 658 sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO); 659 if (md != NULL && 660 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) { 661 /* 662 * Handle the case, when the size of parent provider reduced. 663 */ 664 if (offset < md->md_mediasize) 665 error = ENOSPC; 666 else 667 mirror_metadata_encode(md, sector); 668 } 669 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_metadata_write, error); 670 if (error == 0) 671 error = g_write_data(cp, offset, sector, length); 672 free(sector, M_MIRROR); 673 if (error != 0) { 674 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 675 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 676 G_MIRROR_DEBUG(0, "Cannot write metadata on %s " 677 "(device=%s, error=%d).", 678 g_mirror_get_diskname(disk), sc->sc_name, error); 679 } else { 680 G_MIRROR_DEBUG(1, "Cannot write metadata on %s " 681 "(device=%s, error=%d).", 682 g_mirror_get_diskname(disk), sc->sc_name, error); 683 } 684 if (g_mirror_disconnect_on_failure && 685 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) { 686 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 687 g_mirror_event_send(disk, 688 G_MIRROR_DISK_STATE_DISCONNECTED, 689 G_MIRROR_EVENT_DONTWAIT); 690 } 691 } 692 return (error); 693 } 694 695 static int 696 g_mirror_clear_metadata(struct g_mirror_disk *disk) 697 { 698 int error; 699 700 g_topology_assert_not(); 701 sx_assert(&disk->d_softc->sc_lock, SX_LOCKED); 702 703 if (disk->d_softc->sc_type != G_MIRROR_TYPE_AUTOMATIC) 704 return (0); 705 error = g_mirror_write_metadata(disk, NULL); 706 if (error == 0) { 707 G_MIRROR_DEBUG(2, "Metadata on %s cleared.", 708 g_mirror_get_diskname(disk)); 709 } else { 710 G_MIRROR_DEBUG(0, 711 "Cannot clear metadata on disk %s (error=%d).", 712 g_mirror_get_diskname(disk), error); 713 } 714 return (error); 715 } 716 717 void 718 g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk, 719 struct g_mirror_metadata *md) 720 { 721 722 strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic)); 723 md->md_version = G_MIRROR_VERSION; 724 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name)); 725 md->md_mid = sc->sc_id; 726 md->md_all = sc->sc_ndisks; 727 md->md_slice = sc->sc_slice; 728 md->md_balance = sc->sc_balance; 729 md->md_genid = sc->sc_genid; 730 md->md_mediasize = sc->sc_mediasize; 731 md->md_sectorsize = sc->sc_sectorsize; 732 md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK); 733 bzero(md->md_provider, sizeof(md->md_provider)); 734 if (disk == NULL) { 735 md->md_did = arc4random(); 736 md->md_priority = 0; 737 md->md_syncid = 0; 738 md->md_dflags = 0; 739 md->md_sync_offset = 0; 740 md->md_provsize = 0; 741 } else { 742 md->md_did = disk->d_id; 743 md->md_priority = disk->d_priority; 744 md->md_syncid = disk->d_sync.ds_syncid; 745 md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK); 746 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 747 md->md_sync_offset = disk->d_sync.ds_offset_done; 748 else 749 md->md_sync_offset = 0; 750 if ((disk->d_flags & G_MIRROR_DISK_FLAG_HARDCODED) != 0) { 751 strlcpy(md->md_provider, 752 disk->d_consumer->provider->name, 753 sizeof(md->md_provider)); 754 } 755 md->md_provsize = disk->d_consumer->provider->mediasize; 756 } 757 } 758 759 void 760 g_mirror_update_metadata(struct g_mirror_disk *disk) 761 { 762 struct g_mirror_softc *sc; 763 struct g_mirror_metadata md; 764 int error; 765 766 g_topology_assert_not(); 767 sc = disk->d_softc; 768 sx_assert(&sc->sc_lock, SX_LOCKED); 769 770 if (sc->sc_type != G_MIRROR_TYPE_AUTOMATIC) 771 return; 772 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) 773 g_mirror_fill_metadata(sc, disk, &md); 774 error = g_mirror_write_metadata(disk, &md); 775 if (error == 0) { 776 G_MIRROR_DEBUG(2, "Metadata on %s updated.", 777 g_mirror_get_diskname(disk)); 778 } else { 779 G_MIRROR_DEBUG(0, 780 "Cannot update metadata on disk %s (error=%d).", 781 g_mirror_get_diskname(disk), error); 782 } 783 } 784 785 static void 786 g_mirror_bump_syncid(struct g_mirror_softc *sc) 787 { 788 struct g_mirror_disk *disk; 789 790 g_topology_assert_not(); 791 sx_assert(&sc->sc_lock, SX_XLOCKED); 792 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 793 ("%s called with no active disks (device=%s).", __func__, 794 sc->sc_name)); 795 796 sc->sc_syncid++; 797 G_MIRROR_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name, 798 sc->sc_syncid); 799 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 800 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 801 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 802 disk->d_sync.ds_syncid = sc->sc_syncid; 803 g_mirror_update_metadata(disk); 804 } 805 } 806 } 807 808 static void 809 g_mirror_bump_genid(struct g_mirror_softc *sc) 810 { 811 struct g_mirror_disk *disk; 812 813 g_topology_assert_not(); 814 sx_assert(&sc->sc_lock, SX_XLOCKED); 815 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 816 ("%s called with no active disks (device=%s).", __func__, 817 sc->sc_name)); 818 819 sc->sc_genid++; 820 G_MIRROR_DEBUG(1, "Device %s: genid bumped to %u.", sc->sc_name, 821 sc->sc_genid); 822 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 823 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 824 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 825 disk->d_genid = sc->sc_genid; 826 g_mirror_update_metadata(disk); 827 } 828 } 829 } 830 831 static int 832 g_mirror_idle(struct g_mirror_softc *sc, int acw) 833 { 834 struct g_mirror_disk *disk; 835 int timeout; 836 837 g_topology_assert_not(); 838 sx_assert(&sc->sc_lock, SX_XLOCKED); 839 840 if (sc->sc_provider == NULL) 841 return (0); 842 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 843 return (0); 844 if (sc->sc_idle) 845 return (0); 846 if (sc->sc_writes > 0) 847 return (0); 848 if (acw > 0 || (acw == -1 && sc->sc_provider->acw > 0)) { 849 timeout = g_mirror_idletime - (time_uptime - sc->sc_last_write); 850 if (!g_mirror_shutdown && timeout > 0) 851 return (timeout); 852 } 853 sc->sc_idle = 1; 854 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 855 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 856 continue; 857 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as clean.", 858 g_mirror_get_diskname(disk), sc->sc_name); 859 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 860 g_mirror_update_metadata(disk); 861 } 862 return (0); 863 } 864 865 static void 866 g_mirror_unidle(struct g_mirror_softc *sc) 867 { 868 struct g_mirror_disk *disk; 869 870 g_topology_assert_not(); 871 sx_assert(&sc->sc_lock, SX_XLOCKED); 872 873 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 874 return; 875 sc->sc_idle = 0; 876 sc->sc_last_write = time_uptime; 877 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 878 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 879 continue; 880 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as dirty.", 881 g_mirror_get_diskname(disk), sc->sc_name); 882 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 883 g_mirror_update_metadata(disk); 884 } 885 } 886 887 static void 888 g_mirror_flush_done(struct bio *bp) 889 { 890 struct g_mirror_softc *sc; 891 struct bio *pbp; 892 893 pbp = bp->bio_parent; 894 sc = pbp->bio_to->private; 895 mtx_lock(&sc->sc_done_mtx); 896 if (pbp->bio_error == 0) 897 pbp->bio_error = bp->bio_error; 898 pbp->bio_completed += bp->bio_completed; 899 pbp->bio_inbed++; 900 if (pbp->bio_children == pbp->bio_inbed) { 901 mtx_unlock(&sc->sc_done_mtx); 902 g_io_deliver(pbp, pbp->bio_error); 903 } else 904 mtx_unlock(&sc->sc_done_mtx); 905 g_destroy_bio(bp); 906 } 907 908 static void 909 g_mirror_done(struct bio *bp) 910 { 911 struct g_mirror_softc *sc; 912 913 sc = bp->bio_from->geom->softc; 914 bp->bio_cflags = G_MIRROR_BIO_FLAG_REGULAR; 915 mtx_lock(&sc->sc_queue_mtx); 916 bioq_insert_tail(&sc->sc_queue, bp); 917 mtx_unlock(&sc->sc_queue_mtx); 918 wakeup(sc); 919 } 920 921 static void 922 g_mirror_regular_request(struct bio *bp) 923 { 924 struct g_mirror_softc *sc; 925 struct g_mirror_disk *disk; 926 struct bio *pbp; 927 928 g_topology_assert_not(); 929 930 pbp = bp->bio_parent; 931 sc = pbp->bio_to->private; 932 bp->bio_from->index--; 933 if (bp->bio_cmd == BIO_WRITE) 934 sc->sc_writes--; 935 disk = bp->bio_from->private; 936 if (disk == NULL) { 937 g_topology_lock(); 938 g_mirror_kill_consumer(sc, bp->bio_from); 939 g_topology_unlock(); 940 } 941 942 if (bp->bio_cmd == BIO_READ) 943 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_read, 944 bp->bio_error); 945 else if (bp->bio_cmd == BIO_WRITE) 946 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_write, 947 bp->bio_error); 948 949 pbp->bio_inbed++; 950 KASSERT(pbp->bio_inbed <= pbp->bio_children, 951 ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed, 952 pbp->bio_children)); 953 if (bp->bio_error == 0 && pbp->bio_error == 0) { 954 G_MIRROR_LOGREQ(3, bp, "Request delivered."); 955 g_destroy_bio(bp); 956 if (pbp->bio_children == pbp->bio_inbed) { 957 G_MIRROR_LOGREQ(3, pbp, "Request delivered."); 958 pbp->bio_completed = pbp->bio_length; 959 if (pbp->bio_cmd == BIO_WRITE || 960 pbp->bio_cmd == BIO_DELETE) { 961 bioq_remove(&sc->sc_inflight, pbp); 962 /* Release delayed sync requests if possible. */ 963 g_mirror_sync_release(sc); 964 } 965 g_io_deliver(pbp, pbp->bio_error); 966 } 967 return; 968 } else if (bp->bio_error != 0) { 969 if (pbp->bio_error == 0) 970 pbp->bio_error = bp->bio_error; 971 if (disk != NULL) { 972 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 973 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 974 G_MIRROR_LOGREQ(0, bp, 975 "Request failed (error=%d).", 976 bp->bio_error); 977 } else { 978 G_MIRROR_LOGREQ(1, bp, 979 "Request failed (error=%d).", 980 bp->bio_error); 981 } 982 if (g_mirror_disconnect_on_failure && 983 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) 984 { 985 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 986 g_mirror_event_send(disk, 987 G_MIRROR_DISK_STATE_DISCONNECTED, 988 G_MIRROR_EVENT_DONTWAIT); 989 } 990 } 991 switch (pbp->bio_cmd) { 992 case BIO_DELETE: 993 case BIO_WRITE: 994 pbp->bio_inbed--; 995 pbp->bio_children--; 996 break; 997 } 998 } 999 g_destroy_bio(bp); 1000 1001 switch (pbp->bio_cmd) { 1002 case BIO_READ: 1003 if (pbp->bio_inbed < pbp->bio_children) 1004 break; 1005 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 1) 1006 g_io_deliver(pbp, pbp->bio_error); 1007 else { 1008 pbp->bio_error = 0; 1009 mtx_lock(&sc->sc_queue_mtx); 1010 bioq_insert_tail(&sc->sc_queue, pbp); 1011 mtx_unlock(&sc->sc_queue_mtx); 1012 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 1013 wakeup(sc); 1014 } 1015 break; 1016 case BIO_DELETE: 1017 case BIO_WRITE: 1018 if (pbp->bio_children == 0) { 1019 /* 1020 * All requests failed. 1021 */ 1022 } else if (pbp->bio_inbed < pbp->bio_children) { 1023 /* Do nothing. */ 1024 break; 1025 } else if (pbp->bio_children == pbp->bio_inbed) { 1026 /* Some requests succeeded. */ 1027 pbp->bio_error = 0; 1028 pbp->bio_completed = pbp->bio_length; 1029 } 1030 bioq_remove(&sc->sc_inflight, pbp); 1031 /* Release delayed sync requests if possible. */ 1032 g_mirror_sync_release(sc); 1033 g_io_deliver(pbp, pbp->bio_error); 1034 break; 1035 default: 1036 KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd)); 1037 break; 1038 } 1039 } 1040 1041 static void 1042 g_mirror_sync_done(struct bio *bp) 1043 { 1044 struct g_mirror_softc *sc; 1045 1046 G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered."); 1047 sc = bp->bio_from->geom->softc; 1048 bp->bio_cflags = G_MIRROR_BIO_FLAG_SYNC; 1049 mtx_lock(&sc->sc_queue_mtx); 1050 bioq_insert_tail(&sc->sc_queue, bp); 1051 mtx_unlock(&sc->sc_queue_mtx); 1052 wakeup(sc); 1053 } 1054 1055 static void 1056 g_mirror_candelete(struct bio *bp) 1057 { 1058 struct g_mirror_softc *sc; 1059 struct g_mirror_disk *disk; 1060 int *val; 1061 1062 sc = bp->bio_to->private; 1063 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1064 if (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) 1065 break; 1066 } 1067 val = (int *)bp->bio_data; 1068 *val = (disk != NULL); 1069 g_io_deliver(bp, 0); 1070 } 1071 1072 static void 1073 g_mirror_kernel_dump(struct bio *bp) 1074 { 1075 struct g_mirror_softc *sc; 1076 struct g_mirror_disk *disk; 1077 struct bio *cbp; 1078 struct g_kerneldump *gkd; 1079 1080 /* 1081 * We configure dumping to the first component, because this component 1082 * will be used for reading with 'prefer' balance algorithm. 1083 * If the component with the highest priority is currently disconnected 1084 * we will not be able to read the dump after the reboot if it will be 1085 * connected and synchronized later. Can we do something better? 1086 */ 1087 sc = bp->bio_to->private; 1088 disk = LIST_FIRST(&sc->sc_disks); 1089 1090 gkd = (struct g_kerneldump *)bp->bio_data; 1091 if (gkd->length > bp->bio_to->mediasize) 1092 gkd->length = bp->bio_to->mediasize; 1093 cbp = g_clone_bio(bp); 1094 if (cbp == NULL) { 1095 g_io_deliver(bp, ENOMEM); 1096 return; 1097 } 1098 cbp->bio_done = g_std_done; 1099 g_io_request(cbp, disk->d_consumer); 1100 G_MIRROR_DEBUG(1, "Kernel dump will go to %s.", 1101 g_mirror_get_diskname(disk)); 1102 } 1103 1104 static void 1105 g_mirror_flush(struct g_mirror_softc *sc, struct bio *bp) 1106 { 1107 struct bio_queue_head queue; 1108 struct g_mirror_disk *disk; 1109 struct g_consumer *cp; 1110 struct bio *cbp; 1111 1112 bioq_init(&queue); 1113 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1114 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1115 continue; 1116 cbp = g_clone_bio(bp); 1117 if (cbp == NULL) { 1118 while ((cbp = bioq_takefirst(&queue)) != NULL) 1119 g_destroy_bio(cbp); 1120 if (bp->bio_error == 0) 1121 bp->bio_error = ENOMEM; 1122 g_io_deliver(bp, bp->bio_error); 1123 return; 1124 } 1125 bioq_insert_tail(&queue, cbp); 1126 cbp->bio_done = g_mirror_flush_done; 1127 cbp->bio_caller1 = disk; 1128 cbp->bio_to = disk->d_consumer->provider; 1129 } 1130 while ((cbp = bioq_takefirst(&queue)) != NULL) { 1131 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1132 disk = cbp->bio_caller1; 1133 cbp->bio_caller1 = NULL; 1134 cp = disk->d_consumer; 1135 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1136 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1137 cp->acr, cp->acw, cp->ace)); 1138 g_io_request(cbp, disk->d_consumer); 1139 } 1140 } 1141 1142 static void 1143 g_mirror_start(struct bio *bp) 1144 { 1145 struct g_mirror_softc *sc; 1146 1147 sc = bp->bio_to->private; 1148 /* 1149 * If sc == NULL or there are no valid disks, provider's error 1150 * should be set and g_mirror_start() should not be called at all. 1151 */ 1152 KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1153 ("Provider's error should be set (error=%d)(mirror=%s).", 1154 bp->bio_to->error, bp->bio_to->name)); 1155 G_MIRROR_LOGREQ(3, bp, "Request received."); 1156 1157 switch (bp->bio_cmd) { 1158 case BIO_READ: 1159 case BIO_WRITE: 1160 case BIO_DELETE: 1161 break; 1162 case BIO_FLUSH: 1163 g_mirror_flush(sc, bp); 1164 return; 1165 case BIO_GETATTR: 1166 if (!strcmp(bp->bio_attribute, "GEOM::candelete")) { 1167 g_mirror_candelete(bp); 1168 return; 1169 } else if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) { 1170 g_mirror_kernel_dump(bp); 1171 return; 1172 } 1173 /* FALLTHROUGH */ 1174 default: 1175 g_io_deliver(bp, EOPNOTSUPP); 1176 return; 1177 } 1178 mtx_lock(&sc->sc_queue_mtx); 1179 bioq_insert_tail(&sc->sc_queue, bp); 1180 mtx_unlock(&sc->sc_queue_mtx); 1181 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 1182 wakeup(sc); 1183 } 1184 1185 /* 1186 * Return TRUE if the given request is colliding with a in-progress 1187 * synchronization request. 1188 */ 1189 static int 1190 g_mirror_sync_collision(struct g_mirror_softc *sc, struct bio *bp) 1191 { 1192 struct g_mirror_disk *disk; 1193 struct bio *sbp; 1194 off_t rstart, rend, sstart, send; 1195 u_int i; 1196 1197 if (sc->sc_sync.ds_ndisks == 0) 1198 return (0); 1199 rstart = bp->bio_offset; 1200 rend = bp->bio_offset + bp->bio_length; 1201 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1202 if (disk->d_state != G_MIRROR_DISK_STATE_SYNCHRONIZING) 1203 continue; 1204 for (i = 0; i < g_mirror_syncreqs; i++) { 1205 sbp = disk->d_sync.ds_bios[i]; 1206 if (sbp == NULL) 1207 continue; 1208 sstart = sbp->bio_offset; 1209 send = sbp->bio_offset + sbp->bio_length; 1210 if (rend > sstart && rstart < send) 1211 return (1); 1212 } 1213 } 1214 return (0); 1215 } 1216 1217 /* 1218 * Return TRUE if the given sync request is colliding with a in-progress regular 1219 * request. 1220 */ 1221 static int 1222 g_mirror_regular_collision(struct g_mirror_softc *sc, struct bio *sbp) 1223 { 1224 off_t rstart, rend, sstart, send; 1225 struct bio *bp; 1226 1227 if (sc->sc_sync.ds_ndisks == 0) 1228 return (0); 1229 sstart = sbp->bio_offset; 1230 send = sbp->bio_offset + sbp->bio_length; 1231 TAILQ_FOREACH(bp, &sc->sc_inflight.queue, bio_queue) { 1232 rstart = bp->bio_offset; 1233 rend = bp->bio_offset + bp->bio_length; 1234 if (rend > sstart && rstart < send) 1235 return (1); 1236 } 1237 return (0); 1238 } 1239 1240 /* 1241 * Puts request onto delayed queue. 1242 */ 1243 static void 1244 g_mirror_regular_delay(struct g_mirror_softc *sc, struct bio *bp) 1245 { 1246 1247 G_MIRROR_LOGREQ(2, bp, "Delaying request."); 1248 bioq_insert_head(&sc->sc_regular_delayed, bp); 1249 } 1250 1251 /* 1252 * Puts synchronization request onto delayed queue. 1253 */ 1254 static void 1255 g_mirror_sync_delay(struct g_mirror_softc *sc, struct bio *bp) 1256 { 1257 1258 G_MIRROR_LOGREQ(2, bp, "Delaying synchronization request."); 1259 bioq_insert_tail(&sc->sc_sync_delayed, bp); 1260 } 1261 1262 /* 1263 * Releases delayed regular requests which don't collide anymore with sync 1264 * requests. 1265 */ 1266 static void 1267 g_mirror_regular_release(struct g_mirror_softc *sc) 1268 { 1269 struct bio *bp, *bp2; 1270 1271 TAILQ_FOREACH_SAFE(bp, &sc->sc_regular_delayed.queue, bio_queue, bp2) { 1272 if (g_mirror_sync_collision(sc, bp)) 1273 continue; 1274 bioq_remove(&sc->sc_regular_delayed, bp); 1275 G_MIRROR_LOGREQ(2, bp, "Releasing delayed request (%p).", bp); 1276 mtx_lock(&sc->sc_queue_mtx); 1277 bioq_insert_head(&sc->sc_queue, bp); 1278 mtx_unlock(&sc->sc_queue_mtx); 1279 } 1280 } 1281 1282 /* 1283 * Releases delayed sync requests which don't collide anymore with regular 1284 * requests. 1285 */ 1286 static void 1287 g_mirror_sync_release(struct g_mirror_softc *sc) 1288 { 1289 struct bio *bp, *bp2; 1290 1291 TAILQ_FOREACH_SAFE(bp, &sc->sc_sync_delayed.queue, bio_queue, bp2) { 1292 if (g_mirror_regular_collision(sc, bp)) 1293 continue; 1294 bioq_remove(&sc->sc_sync_delayed, bp); 1295 G_MIRROR_LOGREQ(2, bp, 1296 "Releasing delayed synchronization request."); 1297 g_io_request(bp, bp->bio_from); 1298 } 1299 } 1300 1301 /* 1302 * Free a synchronization request and clear its slot in the array. 1303 */ 1304 static void 1305 g_mirror_sync_request_free(struct g_mirror_disk *disk, struct bio *bp) 1306 { 1307 int i; 1308 1309 if (disk != NULL && disk->d_sync.ds_bios != NULL) { 1310 i = (int)(uintptr_t)bp->bio_caller1; 1311 disk->d_sync.ds_bios[i] = NULL; 1312 } 1313 free(bp->bio_data, M_MIRROR); 1314 g_destroy_bio(bp); 1315 } 1316 1317 /* 1318 * Handle synchronization requests. 1319 * Every synchronization request is two-steps process: first, READ request is 1320 * send to active provider and then WRITE request (with read data) to the provider 1321 * being synchronized. When WRITE is finished, new synchronization request is 1322 * send. 1323 */ 1324 static void 1325 g_mirror_sync_request(struct bio *bp) 1326 { 1327 struct g_mirror_softc *sc; 1328 struct g_mirror_disk *disk; 1329 struct g_mirror_disk_sync *sync; 1330 1331 bp->bio_from->index--; 1332 sc = bp->bio_from->geom->softc; 1333 disk = bp->bio_from->private; 1334 if (disk == NULL) { 1335 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 1336 g_topology_lock(); 1337 g_mirror_kill_consumer(sc, bp->bio_from); 1338 g_topology_unlock(); 1339 g_mirror_sync_request_free(NULL, bp); 1340 sx_xlock(&sc->sc_lock); 1341 return; 1342 } 1343 1344 /* 1345 * Synchronization request. 1346 */ 1347 switch (bp->bio_cmd) { 1348 case BIO_READ: 1349 { 1350 struct g_consumer *cp; 1351 1352 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_sync_request_read, 1353 bp->bio_error); 1354 1355 if (bp->bio_error != 0) { 1356 G_MIRROR_LOGREQ(0, bp, 1357 "Synchronization request failed (error=%d).", 1358 bp->bio_error); 1359 g_mirror_sync_request_free(disk, bp); 1360 return; 1361 } 1362 G_MIRROR_LOGREQ(3, bp, 1363 "Synchronization request half-finished."); 1364 bp->bio_cmd = BIO_WRITE; 1365 bp->bio_cflags = 0; 1366 cp = disk->d_consumer; 1367 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1368 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1369 cp->acr, cp->acw, cp->ace)); 1370 cp->index++; 1371 g_io_request(bp, cp); 1372 return; 1373 } 1374 case BIO_WRITE: 1375 { 1376 off_t offset; 1377 void *data; 1378 int i; 1379 1380 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_sync_request_write, 1381 bp->bio_error); 1382 1383 if (bp->bio_error != 0) { 1384 G_MIRROR_LOGREQ(0, bp, 1385 "Synchronization request failed (error=%d).", 1386 bp->bio_error); 1387 g_mirror_sync_request_free(disk, bp); 1388 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 1389 g_mirror_event_send(disk, 1390 G_MIRROR_DISK_STATE_DISCONNECTED, 1391 G_MIRROR_EVENT_DONTWAIT); 1392 return; 1393 } 1394 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished."); 1395 sync = &disk->d_sync; 1396 if (sync->ds_offset >= sc->sc_mediasize || 1397 sync->ds_consumer == NULL || 1398 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1399 /* Don't send more synchronization requests. */ 1400 sync->ds_inflight--; 1401 g_mirror_sync_request_free(disk, bp); 1402 if (sync->ds_inflight > 0) 1403 return; 1404 if (sync->ds_consumer == NULL || 1405 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1406 return; 1407 } 1408 /* Disk up-to-date, activate it. */ 1409 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE, 1410 G_MIRROR_EVENT_DONTWAIT); 1411 return; 1412 } 1413 1414 /* Send next synchronization request. */ 1415 data = bp->bio_data; 1416 g_reset_bio(bp); 1417 bp->bio_cmd = BIO_READ; 1418 bp->bio_offset = sync->ds_offset; 1419 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset); 1420 sync->ds_offset += bp->bio_length; 1421 bp->bio_done = g_mirror_sync_done; 1422 bp->bio_data = data; 1423 bp->bio_from = sync->ds_consumer; 1424 bp->bio_to = sc->sc_provider; 1425 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 1426 sync->ds_consumer->index++; 1427 /* 1428 * Delay the request if it is colliding with a regular request. 1429 */ 1430 if (g_mirror_regular_collision(sc, bp)) 1431 g_mirror_sync_delay(sc, bp); 1432 else 1433 g_io_request(bp, sync->ds_consumer); 1434 1435 /* Release delayed requests if possible. */ 1436 g_mirror_regular_release(sc); 1437 1438 /* Find the smallest offset */ 1439 offset = sc->sc_mediasize; 1440 for (i = 0; i < g_mirror_syncreqs; i++) { 1441 bp = sync->ds_bios[i]; 1442 if (bp->bio_offset < offset) 1443 offset = bp->bio_offset; 1444 } 1445 if (sync->ds_offset_done + (MAXPHYS * 100) < offset) { 1446 /* Update offset_done on every 100 blocks. */ 1447 sync->ds_offset_done = offset; 1448 g_mirror_update_metadata(disk); 1449 } 1450 return; 1451 } 1452 default: 1453 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1454 bp->bio_cmd, sc->sc_name)); 1455 break; 1456 } 1457 } 1458 1459 static void 1460 g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp) 1461 { 1462 struct g_mirror_disk *disk; 1463 struct g_consumer *cp; 1464 struct bio *cbp; 1465 1466 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1467 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE) 1468 break; 1469 } 1470 if (disk == NULL) { 1471 if (bp->bio_error == 0) 1472 bp->bio_error = ENXIO; 1473 g_io_deliver(bp, bp->bio_error); 1474 return; 1475 } 1476 cbp = g_clone_bio(bp); 1477 if (cbp == NULL) { 1478 if (bp->bio_error == 0) 1479 bp->bio_error = ENOMEM; 1480 g_io_deliver(bp, bp->bio_error); 1481 return; 1482 } 1483 /* 1484 * Fill in the component buf structure. 1485 */ 1486 cp = disk->d_consumer; 1487 cbp->bio_done = g_mirror_done; 1488 cbp->bio_to = cp->provider; 1489 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1490 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1491 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1492 cp->acw, cp->ace)); 1493 cp->index++; 1494 g_io_request(cbp, cp); 1495 } 1496 1497 static void 1498 g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp) 1499 { 1500 struct g_mirror_disk *disk; 1501 struct g_consumer *cp; 1502 struct bio *cbp; 1503 1504 disk = g_mirror_get_disk(sc); 1505 if (disk == NULL) { 1506 if (bp->bio_error == 0) 1507 bp->bio_error = ENXIO; 1508 g_io_deliver(bp, bp->bio_error); 1509 return; 1510 } 1511 cbp = g_clone_bio(bp); 1512 if (cbp == NULL) { 1513 if (bp->bio_error == 0) 1514 bp->bio_error = ENOMEM; 1515 g_io_deliver(bp, bp->bio_error); 1516 return; 1517 } 1518 /* 1519 * Fill in the component buf structure. 1520 */ 1521 cp = disk->d_consumer; 1522 cbp->bio_done = g_mirror_done; 1523 cbp->bio_to = cp->provider; 1524 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1525 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1526 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1527 cp->acw, cp->ace)); 1528 cp->index++; 1529 g_io_request(cbp, cp); 1530 } 1531 1532 #define TRACK_SIZE (1 * 1024 * 1024) 1533 #define LOAD_SCALE 256 1534 #define ABS(x) (((x) >= 0) ? (x) : (-(x))) 1535 1536 static void 1537 g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp) 1538 { 1539 struct g_mirror_disk *disk, *dp; 1540 struct g_consumer *cp; 1541 struct bio *cbp; 1542 int prio, best; 1543 1544 /* Find a disk with the smallest load. */ 1545 disk = NULL; 1546 best = INT_MAX; 1547 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1548 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1549 continue; 1550 prio = dp->load; 1551 /* If disk head is precisely in position - highly prefer it. */ 1552 if (dp->d_last_offset == bp->bio_offset) 1553 prio -= 2 * LOAD_SCALE; 1554 else 1555 /* If disk head is close to position - prefer it. */ 1556 if (ABS(dp->d_last_offset - bp->bio_offset) < TRACK_SIZE) 1557 prio -= 1 * LOAD_SCALE; 1558 if (prio <= best) { 1559 disk = dp; 1560 best = prio; 1561 } 1562 } 1563 KASSERT(disk != NULL, ("NULL disk for %s.", sc->sc_name)); 1564 cbp = g_clone_bio(bp); 1565 if (cbp == NULL) { 1566 if (bp->bio_error == 0) 1567 bp->bio_error = ENOMEM; 1568 g_io_deliver(bp, bp->bio_error); 1569 return; 1570 } 1571 /* 1572 * Fill in the component buf structure. 1573 */ 1574 cp = disk->d_consumer; 1575 cbp->bio_done = g_mirror_done; 1576 cbp->bio_to = cp->provider; 1577 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1578 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1579 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1580 cp->acw, cp->ace)); 1581 cp->index++; 1582 /* Remember last head position */ 1583 disk->d_last_offset = bp->bio_offset + bp->bio_length; 1584 /* Update loads. */ 1585 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1586 dp->load = (dp->d_consumer->index * LOAD_SCALE + 1587 dp->load * 7) / 8; 1588 } 1589 g_io_request(cbp, cp); 1590 } 1591 1592 static void 1593 g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp) 1594 { 1595 struct bio_queue_head queue; 1596 struct g_mirror_disk *disk; 1597 struct g_consumer *cp; 1598 struct bio *cbp; 1599 off_t left, mod, offset, slice; 1600 u_char *data; 1601 u_int ndisks; 1602 1603 if (bp->bio_length <= sc->sc_slice) { 1604 g_mirror_request_round_robin(sc, bp); 1605 return; 1606 } 1607 ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE); 1608 slice = bp->bio_length / ndisks; 1609 mod = slice % sc->sc_provider->sectorsize; 1610 if (mod != 0) 1611 slice += sc->sc_provider->sectorsize - mod; 1612 /* 1613 * Allocate all bios before sending any request, so we can 1614 * return ENOMEM in nice and clean way. 1615 */ 1616 left = bp->bio_length; 1617 offset = bp->bio_offset; 1618 data = bp->bio_data; 1619 bioq_init(&queue); 1620 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1621 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1622 continue; 1623 cbp = g_clone_bio(bp); 1624 if (cbp == NULL) { 1625 while ((cbp = bioq_takefirst(&queue)) != NULL) 1626 g_destroy_bio(cbp); 1627 if (bp->bio_error == 0) 1628 bp->bio_error = ENOMEM; 1629 g_io_deliver(bp, bp->bio_error); 1630 return; 1631 } 1632 bioq_insert_tail(&queue, cbp); 1633 cbp->bio_done = g_mirror_done; 1634 cbp->bio_caller1 = disk; 1635 cbp->bio_to = disk->d_consumer->provider; 1636 cbp->bio_offset = offset; 1637 cbp->bio_data = data; 1638 cbp->bio_length = MIN(left, slice); 1639 left -= cbp->bio_length; 1640 if (left == 0) 1641 break; 1642 offset += cbp->bio_length; 1643 data += cbp->bio_length; 1644 } 1645 while ((cbp = bioq_takefirst(&queue)) != NULL) { 1646 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1647 disk = cbp->bio_caller1; 1648 cbp->bio_caller1 = NULL; 1649 cp = disk->d_consumer; 1650 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1651 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1652 cp->acr, cp->acw, cp->ace)); 1653 disk->d_consumer->index++; 1654 g_io_request(cbp, disk->d_consumer); 1655 } 1656 } 1657 1658 static void 1659 g_mirror_register_request(struct bio *bp) 1660 { 1661 struct g_mirror_softc *sc; 1662 1663 sc = bp->bio_to->private; 1664 switch (bp->bio_cmd) { 1665 case BIO_READ: 1666 switch (sc->sc_balance) { 1667 case G_MIRROR_BALANCE_LOAD: 1668 g_mirror_request_load(sc, bp); 1669 break; 1670 case G_MIRROR_BALANCE_PREFER: 1671 g_mirror_request_prefer(sc, bp); 1672 break; 1673 case G_MIRROR_BALANCE_ROUND_ROBIN: 1674 g_mirror_request_round_robin(sc, bp); 1675 break; 1676 case G_MIRROR_BALANCE_SPLIT: 1677 g_mirror_request_split(sc, bp); 1678 break; 1679 } 1680 return; 1681 case BIO_WRITE: 1682 case BIO_DELETE: 1683 { 1684 struct g_mirror_disk *disk; 1685 struct g_mirror_disk_sync *sync; 1686 struct bio_queue_head queue; 1687 struct g_consumer *cp; 1688 struct bio *cbp; 1689 1690 /* 1691 * Delay the request if it is colliding with a synchronization 1692 * request. 1693 */ 1694 if (g_mirror_sync_collision(sc, bp)) { 1695 g_mirror_regular_delay(sc, bp); 1696 return; 1697 } 1698 1699 if (sc->sc_idle) 1700 g_mirror_unidle(sc); 1701 else 1702 sc->sc_last_write = time_uptime; 1703 1704 /* 1705 * Bump syncid on first write. 1706 */ 1707 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) { 1708 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 1709 g_mirror_bump_syncid(sc); 1710 } 1711 1712 /* 1713 * Allocate all bios before sending any request, so we can 1714 * return ENOMEM in nice and clean way. 1715 */ 1716 bioq_init(&queue); 1717 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1718 sync = &disk->d_sync; 1719 switch (disk->d_state) { 1720 case G_MIRROR_DISK_STATE_ACTIVE: 1721 break; 1722 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 1723 if (bp->bio_offset >= sync->ds_offset) 1724 continue; 1725 break; 1726 default: 1727 continue; 1728 } 1729 if (bp->bio_cmd == BIO_DELETE && 1730 (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) == 0) 1731 continue; 1732 cbp = g_clone_bio(bp); 1733 if (cbp == NULL) { 1734 while ((cbp = bioq_takefirst(&queue)) != NULL) 1735 g_destroy_bio(cbp); 1736 if (bp->bio_error == 0) 1737 bp->bio_error = ENOMEM; 1738 g_io_deliver(bp, bp->bio_error); 1739 return; 1740 } 1741 bioq_insert_tail(&queue, cbp); 1742 cbp->bio_done = g_mirror_done; 1743 cp = disk->d_consumer; 1744 cbp->bio_caller1 = cp; 1745 cbp->bio_to = cp->provider; 1746 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1747 ("Consumer %s not opened (r%dw%de%d).", 1748 cp->provider->name, cp->acr, cp->acw, cp->ace)); 1749 } 1750 if (bioq_first(&queue) == NULL) { 1751 g_io_deliver(bp, EOPNOTSUPP); 1752 return; 1753 } 1754 while ((cbp = bioq_takefirst(&queue)) != NULL) { 1755 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1756 cp = cbp->bio_caller1; 1757 cbp->bio_caller1 = NULL; 1758 cp->index++; 1759 sc->sc_writes++; 1760 g_io_request(cbp, cp); 1761 } 1762 /* 1763 * Put request onto inflight queue, so we can check if new 1764 * synchronization requests don't collide with it. 1765 */ 1766 bioq_insert_tail(&sc->sc_inflight, bp); 1767 return; 1768 } 1769 default: 1770 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1771 bp->bio_cmd, sc->sc_name)); 1772 break; 1773 } 1774 } 1775 1776 static int 1777 g_mirror_can_destroy(struct g_mirror_softc *sc) 1778 { 1779 struct g_geom *gp; 1780 struct g_consumer *cp; 1781 1782 g_topology_assert(); 1783 gp = sc->sc_geom; 1784 if (gp->softc == NULL) 1785 return (1); 1786 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_TASTING) != 0) 1787 return (0); 1788 LIST_FOREACH(cp, &gp->consumer, consumer) { 1789 if (g_mirror_is_busy(sc, cp)) 1790 return (0); 1791 } 1792 gp = sc->sc_sync.ds_geom; 1793 LIST_FOREACH(cp, &gp->consumer, consumer) { 1794 if (g_mirror_is_busy(sc, cp)) 1795 return (0); 1796 } 1797 G_MIRROR_DEBUG(2, "No I/O requests for %s, it can be destroyed.", 1798 sc->sc_name); 1799 return (1); 1800 } 1801 1802 static int 1803 g_mirror_try_destroy(struct g_mirror_softc *sc) 1804 { 1805 1806 if (sc->sc_rootmount != NULL) { 1807 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 1808 sc->sc_rootmount); 1809 root_mount_rel(sc->sc_rootmount); 1810 sc->sc_rootmount = NULL; 1811 } 1812 g_topology_lock(); 1813 if (!g_mirror_can_destroy(sc)) { 1814 g_topology_unlock(); 1815 return (0); 1816 } 1817 sc->sc_geom->softc = NULL; 1818 sc->sc_sync.ds_geom->softc = NULL; 1819 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WAIT) != 0) { 1820 g_topology_unlock(); 1821 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1822 &sc->sc_worker); 1823 /* Unlock sc_lock here, as it can be destroyed after wakeup. */ 1824 sx_xunlock(&sc->sc_lock); 1825 wakeup(&sc->sc_worker); 1826 sc->sc_worker = NULL; 1827 } else { 1828 g_topology_unlock(); 1829 g_mirror_destroy_device(sc); 1830 } 1831 return (1); 1832 } 1833 1834 /* 1835 * Worker thread. 1836 */ 1837 static void 1838 g_mirror_worker(void *arg) 1839 { 1840 struct g_mirror_softc *sc; 1841 struct g_mirror_event *ep; 1842 struct bio *bp; 1843 int timeout; 1844 1845 sc = arg; 1846 thread_lock(curthread); 1847 sched_prio(curthread, PRIBIO); 1848 thread_unlock(curthread); 1849 1850 sx_xlock(&sc->sc_lock); 1851 for (;;) { 1852 G_MIRROR_DEBUG(5, "%s: Let's see...", __func__); 1853 /* 1854 * First take a look at events. 1855 * This is important to handle events before any I/O requests. 1856 */ 1857 ep = g_mirror_event_get(sc); 1858 if (ep != NULL) { 1859 g_mirror_event_remove(sc, ep); 1860 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) { 1861 /* Update only device status. */ 1862 G_MIRROR_DEBUG(3, 1863 "Running event for device %s.", 1864 sc->sc_name); 1865 ep->e_error = 0; 1866 g_mirror_update_device(sc, true); 1867 } else { 1868 /* Update disk status. */ 1869 G_MIRROR_DEBUG(3, "Running event for disk %s.", 1870 g_mirror_get_diskname(ep->e_disk)); 1871 ep->e_error = g_mirror_update_disk(ep->e_disk, 1872 ep->e_state); 1873 if (ep->e_error == 0) 1874 g_mirror_update_device(sc, false); 1875 } 1876 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) { 1877 KASSERT(ep->e_error == 0, 1878 ("Error cannot be handled.")); 1879 g_mirror_event_free(ep); 1880 } else { 1881 ep->e_flags |= G_MIRROR_EVENT_DONE; 1882 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1883 ep); 1884 mtx_lock(&sc->sc_events_mtx); 1885 wakeup(ep); 1886 mtx_unlock(&sc->sc_events_mtx); 1887 } 1888 if ((sc->sc_flags & 1889 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1890 if (g_mirror_try_destroy(sc)) { 1891 curthread->td_pflags &= ~TDP_GEOM; 1892 G_MIRROR_DEBUG(1, "Thread exiting."); 1893 kproc_exit(0); 1894 } 1895 } 1896 G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__); 1897 continue; 1898 } 1899 /* 1900 * Check if we can mark array as CLEAN and if we can't take 1901 * how much seconds should we wait. 1902 */ 1903 timeout = g_mirror_idle(sc, -1); 1904 /* 1905 * Now I/O requests. 1906 */ 1907 /* Get first request from the queue. */ 1908 mtx_lock(&sc->sc_queue_mtx); 1909 bp = bioq_takefirst(&sc->sc_queue); 1910 if (bp == NULL) { 1911 if ((sc->sc_flags & 1912 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1913 mtx_unlock(&sc->sc_queue_mtx); 1914 if (g_mirror_try_destroy(sc)) { 1915 curthread->td_pflags &= ~TDP_GEOM; 1916 G_MIRROR_DEBUG(1, "Thread exiting."); 1917 kproc_exit(0); 1918 } 1919 mtx_lock(&sc->sc_queue_mtx); 1920 if (bioq_first(&sc->sc_queue) != NULL) { 1921 mtx_unlock(&sc->sc_queue_mtx); 1922 continue; 1923 } 1924 } 1925 sx_xunlock(&sc->sc_lock); 1926 /* 1927 * XXX: We can miss an event here, because an event 1928 * can be added without sx-device-lock and without 1929 * mtx-queue-lock. Maybe I should just stop using 1930 * dedicated mutex for events synchronization and 1931 * stick with the queue lock? 1932 * The event will hang here until next I/O request 1933 * or next event is received. 1934 */ 1935 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w1", 1936 timeout * hz); 1937 sx_xlock(&sc->sc_lock); 1938 G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__); 1939 continue; 1940 } 1941 mtx_unlock(&sc->sc_queue_mtx); 1942 1943 if (bp->bio_from->geom == sc->sc_sync.ds_geom && 1944 (bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) { 1945 g_mirror_sync_request(bp); /* READ */ 1946 } else if (bp->bio_to != sc->sc_provider) { 1947 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0) 1948 g_mirror_regular_request(bp); 1949 else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 1950 g_mirror_sync_request(bp); /* WRITE */ 1951 else { 1952 KASSERT(0, 1953 ("Invalid request cflags=0x%hx to=%s.", 1954 bp->bio_cflags, bp->bio_to->name)); 1955 } 1956 } else { 1957 g_mirror_register_request(bp); 1958 } 1959 G_MIRROR_DEBUG(5, "%s: I'm here 9.", __func__); 1960 } 1961 } 1962 1963 static void 1964 g_mirror_update_idle(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 1965 { 1966 1967 sx_assert(&sc->sc_lock, SX_LOCKED); 1968 1969 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 1970 return; 1971 if (!sc->sc_idle && (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) { 1972 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as dirty.", 1973 g_mirror_get_diskname(disk), sc->sc_name); 1974 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1975 } else if (sc->sc_idle && 1976 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 1977 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as clean.", 1978 g_mirror_get_diskname(disk), sc->sc_name); 1979 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 1980 } 1981 } 1982 1983 static void 1984 g_mirror_sync_start(struct g_mirror_disk *disk) 1985 { 1986 struct g_mirror_softc *sc; 1987 struct g_consumer *cp; 1988 struct bio *bp; 1989 int error, i; 1990 1991 g_topology_assert_not(); 1992 sc = disk->d_softc; 1993 sx_assert(&sc->sc_lock, SX_LOCKED); 1994 1995 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 1996 ("Disk %s is not marked for synchronization.", 1997 g_mirror_get_diskname(disk))); 1998 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1999 ("Device not in RUNNING state (%s, %u).", sc->sc_name, 2000 sc->sc_state)); 2001 2002 sx_xunlock(&sc->sc_lock); 2003 g_topology_lock(); 2004 cp = g_new_consumer(sc->sc_sync.ds_geom); 2005 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 2006 error = g_attach(cp, sc->sc_provider); 2007 KASSERT(error == 0, 2008 ("Cannot attach to %s (error=%d).", sc->sc_name, error)); 2009 error = g_access(cp, 1, 0, 0); 2010 KASSERT(error == 0, ("Cannot open %s (error=%d).", sc->sc_name, error)); 2011 g_topology_unlock(); 2012 sx_xlock(&sc->sc_lock); 2013 2014 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name, 2015 g_mirror_get_diskname(disk)); 2016 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) == 0) 2017 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 2018 KASSERT(disk->d_sync.ds_consumer == NULL, 2019 ("Sync consumer already exists (device=%s, disk=%s).", 2020 sc->sc_name, g_mirror_get_diskname(disk))); 2021 2022 disk->d_sync.ds_consumer = cp; 2023 disk->d_sync.ds_consumer->private = disk; 2024 disk->d_sync.ds_consumer->index = 0; 2025 2026 /* 2027 * Allocate memory for synchronization bios and initialize them. 2028 */ 2029 disk->d_sync.ds_bios = malloc(sizeof(struct bio *) * g_mirror_syncreqs, 2030 M_MIRROR, M_WAITOK); 2031 for (i = 0; i < g_mirror_syncreqs; i++) { 2032 bp = g_alloc_bio(); 2033 disk->d_sync.ds_bios[i] = bp; 2034 bp->bio_parent = NULL; 2035 bp->bio_cmd = BIO_READ; 2036 bp->bio_data = malloc(MAXPHYS, M_MIRROR, M_WAITOK); 2037 bp->bio_cflags = 0; 2038 bp->bio_offset = disk->d_sync.ds_offset; 2039 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset); 2040 disk->d_sync.ds_offset += bp->bio_length; 2041 bp->bio_done = g_mirror_sync_done; 2042 bp->bio_from = disk->d_sync.ds_consumer; 2043 bp->bio_to = sc->sc_provider; 2044 bp->bio_caller1 = (void *)(uintptr_t)i; 2045 } 2046 2047 /* Increase the number of disks in SYNCHRONIZING state. */ 2048 sc->sc_sync.ds_ndisks++; 2049 /* Set the number of in-flight synchronization requests. */ 2050 disk->d_sync.ds_inflight = g_mirror_syncreqs; 2051 2052 /* 2053 * Fire off first synchronization requests. 2054 */ 2055 for (i = 0; i < g_mirror_syncreqs; i++) { 2056 bp = disk->d_sync.ds_bios[i]; 2057 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 2058 disk->d_sync.ds_consumer->index++; 2059 /* 2060 * Delay the request if it is colliding with a regular request. 2061 */ 2062 if (g_mirror_regular_collision(sc, bp)) 2063 g_mirror_sync_delay(sc, bp); 2064 else 2065 g_io_request(bp, disk->d_sync.ds_consumer); 2066 } 2067 } 2068 2069 /* 2070 * Stop synchronization process. 2071 * type: 0 - synchronization finished 2072 * 1 - synchronization stopped 2073 */ 2074 static void 2075 g_mirror_sync_stop(struct g_mirror_disk *disk, int type) 2076 { 2077 struct g_mirror_softc *sc; 2078 struct g_consumer *cp; 2079 2080 g_topology_assert_not(); 2081 sc = disk->d_softc; 2082 sx_assert(&sc->sc_lock, SX_LOCKED); 2083 2084 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2085 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2086 g_mirror_disk_state2str(disk->d_state))); 2087 if (disk->d_sync.ds_consumer == NULL) 2088 return; 2089 2090 if (type == 0) { 2091 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.", 2092 sc->sc_name, g_mirror_get_diskname(disk)); 2093 } else /* if (type == 1) */ { 2094 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.", 2095 sc->sc_name, g_mirror_get_diskname(disk)); 2096 } 2097 g_mirror_regular_release(sc); 2098 free(disk->d_sync.ds_bios, M_MIRROR); 2099 disk->d_sync.ds_bios = NULL; 2100 cp = disk->d_sync.ds_consumer; 2101 disk->d_sync.ds_consumer = NULL; 2102 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2103 sc->sc_sync.ds_ndisks--; 2104 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 2105 g_topology_lock(); 2106 g_mirror_kill_consumer(sc, cp); 2107 g_topology_unlock(); 2108 sx_xlock(&sc->sc_lock); 2109 } 2110 2111 static void 2112 g_mirror_launch_provider(struct g_mirror_softc *sc) 2113 { 2114 struct g_mirror_disk *disk; 2115 struct g_provider *pp, *dp; 2116 2117 sx_assert(&sc->sc_lock, SX_LOCKED); 2118 2119 g_topology_lock(); 2120 pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name); 2121 pp->flags |= G_PF_DIRECT_RECEIVE; 2122 pp->mediasize = sc->sc_mediasize; 2123 pp->sectorsize = sc->sc_sectorsize; 2124 pp->stripesize = 0; 2125 pp->stripeoffset = 0; 2126 2127 /* Splitting of unmapped BIO's could work but isn't implemented now */ 2128 if (sc->sc_balance != G_MIRROR_BALANCE_SPLIT) 2129 pp->flags |= G_PF_ACCEPT_UNMAPPED; 2130 2131 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2132 if (disk->d_consumer && disk->d_consumer->provider) { 2133 dp = disk->d_consumer->provider; 2134 if (dp->stripesize > pp->stripesize) { 2135 pp->stripesize = dp->stripesize; 2136 pp->stripeoffset = dp->stripeoffset; 2137 } 2138 /* A provider underneath us doesn't support unmapped */ 2139 if ((dp->flags & G_PF_ACCEPT_UNMAPPED) == 0) { 2140 G_MIRROR_DEBUG(0, "Cancelling unmapped " 2141 "because of %s.", dp->name); 2142 pp->flags &= ~G_PF_ACCEPT_UNMAPPED; 2143 } 2144 } 2145 } 2146 pp->private = sc; 2147 sc->sc_refcnt++; 2148 sc->sc_provider = pp; 2149 g_error_provider(pp, 0); 2150 g_topology_unlock(); 2151 G_MIRROR_DEBUG(0, "Device %s launched (%u/%u).", pp->name, 2152 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE), sc->sc_ndisks); 2153 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2154 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2155 g_mirror_sync_start(disk); 2156 } 2157 } 2158 2159 static void 2160 g_mirror_destroy_provider(struct g_mirror_softc *sc) 2161 { 2162 struct g_mirror_disk *disk; 2163 struct bio *bp; 2164 2165 g_topology_assert_not(); 2166 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).", 2167 sc->sc_name)); 2168 2169 g_topology_lock(); 2170 g_error_provider(sc->sc_provider, ENXIO); 2171 mtx_lock(&sc->sc_queue_mtx); 2172 while ((bp = bioq_takefirst(&sc->sc_queue)) != NULL) { 2173 /* 2174 * Abort any pending I/O that wasn't generated by us. 2175 * Synchronization requests and requests destined for individual 2176 * mirror components can be destroyed immediately. 2177 */ 2178 if (bp->bio_to == sc->sc_provider && 2179 bp->bio_from->geom != sc->sc_sync.ds_geom) { 2180 g_io_deliver(bp, ENXIO); 2181 } else { 2182 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 2183 free(bp->bio_data, M_MIRROR); 2184 g_destroy_bio(bp); 2185 } 2186 } 2187 mtx_unlock(&sc->sc_queue_mtx); 2188 g_wither_provider(sc->sc_provider, ENXIO); 2189 sc->sc_provider = NULL; 2190 G_MIRROR_DEBUG(0, "Device %s: provider destroyed.", sc->sc_name); 2191 g_topology_unlock(); 2192 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2193 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2194 g_mirror_sync_stop(disk, 1); 2195 } 2196 } 2197 2198 static void 2199 g_mirror_go(void *arg) 2200 { 2201 struct g_mirror_softc *sc; 2202 2203 sc = arg; 2204 G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name); 2205 g_mirror_event_send(sc, 0, 2206 G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE); 2207 } 2208 2209 static u_int 2210 g_mirror_determine_state(struct g_mirror_disk *disk) 2211 { 2212 struct g_mirror_softc *sc; 2213 u_int state; 2214 2215 sc = disk->d_softc; 2216 if (sc->sc_syncid == disk->d_sync.ds_syncid) { 2217 if ((disk->d_flags & 2218 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2219 /* Disk does not need synchronization. */ 2220 state = G_MIRROR_DISK_STATE_ACTIVE; 2221 } else { 2222 if ((sc->sc_flags & 2223 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2224 (disk->d_flags & 2225 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2226 /* 2227 * We can start synchronization from 2228 * the stored offset. 2229 */ 2230 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2231 } else { 2232 state = G_MIRROR_DISK_STATE_STALE; 2233 } 2234 } 2235 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) { 2236 /* 2237 * Reset all synchronization data for this disk, 2238 * because if it even was synchronized, it was 2239 * synchronized to disks with different syncid. 2240 */ 2241 disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2242 disk->d_sync.ds_offset = 0; 2243 disk->d_sync.ds_offset_done = 0; 2244 disk->d_sync.ds_syncid = sc->sc_syncid; 2245 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2246 (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2247 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2248 } else { 2249 state = G_MIRROR_DISK_STATE_STALE; 2250 } 2251 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ { 2252 /* 2253 * Not good, NOT GOOD! 2254 * It means that mirror was started on stale disks 2255 * and more fresh disk just arrive. 2256 * If there were writes, mirror is broken, sorry. 2257 * I think the best choice here is don't touch 2258 * this disk and inform the user loudly. 2259 */ 2260 G_MIRROR_DEBUG(0, "Device %s was started before the freshest " 2261 "disk (%s) arrives!! It will not be connected to the " 2262 "running device.", sc->sc_name, 2263 g_mirror_get_diskname(disk)); 2264 g_mirror_destroy_disk(disk); 2265 state = G_MIRROR_DISK_STATE_NONE; 2266 /* Return immediately, because disk was destroyed. */ 2267 return (state); 2268 } 2269 G_MIRROR_DEBUG(3, "State for %s disk: %s.", 2270 g_mirror_get_diskname(disk), g_mirror_disk_state2str(state)); 2271 return (state); 2272 } 2273 2274 /* 2275 * Update device state. 2276 */ 2277 static void 2278 g_mirror_update_device(struct g_mirror_softc *sc, bool force) 2279 { 2280 struct g_mirror_disk *disk; 2281 u_int state; 2282 2283 sx_assert(&sc->sc_lock, SX_XLOCKED); 2284 2285 switch (sc->sc_state) { 2286 case G_MIRROR_DEVICE_STATE_STARTING: 2287 { 2288 struct g_mirror_disk *pdisk, *tdisk; 2289 u_int dirty, ndisks, genid, syncid; 2290 bool broken; 2291 2292 KASSERT(sc->sc_provider == NULL, 2293 ("Non-NULL provider in STARTING state (%s).", sc->sc_name)); 2294 /* 2295 * Are we ready? We are, if all disks are connected or 2296 * if we have any disks and 'force' is true. 2297 */ 2298 ndisks = g_mirror_ndisks(sc, -1); 2299 if (sc->sc_ndisks == ndisks || (force && ndisks > 0)) { 2300 ; 2301 } else if (ndisks == 0) { 2302 /* 2303 * Disks went down in starting phase, so destroy 2304 * device. 2305 */ 2306 callout_drain(&sc->sc_callout); 2307 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2308 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 2309 sc->sc_rootmount); 2310 root_mount_rel(sc->sc_rootmount); 2311 sc->sc_rootmount = NULL; 2312 return; 2313 } else { 2314 return; 2315 } 2316 2317 /* 2318 * Activate all disks with the biggest syncid. 2319 */ 2320 if (force) { 2321 /* 2322 * If 'force' is true, we have been called due to 2323 * timeout, so don't bother canceling timeout. 2324 */ 2325 ndisks = 0; 2326 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2327 if ((disk->d_flags & 2328 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2329 ndisks++; 2330 } 2331 } 2332 if (ndisks == 0) { 2333 /* No valid disks found, destroy device. */ 2334 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2335 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2336 __LINE__, sc->sc_rootmount); 2337 root_mount_rel(sc->sc_rootmount); 2338 sc->sc_rootmount = NULL; 2339 return; 2340 } 2341 } else { 2342 /* Cancel timeout. */ 2343 callout_drain(&sc->sc_callout); 2344 } 2345 2346 /* 2347 * Find the biggest genid. 2348 */ 2349 genid = 0; 2350 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2351 if (disk->d_genid > genid) 2352 genid = disk->d_genid; 2353 } 2354 sc->sc_genid = genid; 2355 /* 2356 * Remove all disks without the biggest genid. 2357 */ 2358 broken = false; 2359 LIST_FOREACH_SAFE(disk, &sc->sc_disks, d_next, tdisk) { 2360 if (disk->d_genid < genid) { 2361 G_MIRROR_DEBUG(0, 2362 "Component %s (device %s) broken, skipping.", 2363 g_mirror_get_diskname(disk), sc->sc_name); 2364 g_mirror_destroy_disk(disk); 2365 /* 2366 * Bump the syncid in case we discover a healthy 2367 * replacement disk after starting the mirror. 2368 */ 2369 broken = true; 2370 } 2371 } 2372 2373 /* 2374 * Find the biggest syncid. 2375 */ 2376 syncid = 0; 2377 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2378 if (disk->d_sync.ds_syncid > syncid) 2379 syncid = disk->d_sync.ds_syncid; 2380 } 2381 2382 /* 2383 * Here we need to look for dirty disks and if all disks 2384 * with the biggest syncid are dirty, we have to choose 2385 * one with the biggest priority and rebuild the rest. 2386 */ 2387 /* 2388 * Find the number of dirty disks with the biggest syncid. 2389 * Find the number of disks with the biggest syncid. 2390 * While here, find a disk with the biggest priority. 2391 */ 2392 dirty = ndisks = 0; 2393 pdisk = NULL; 2394 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2395 if (disk->d_sync.ds_syncid != syncid) 2396 continue; 2397 if ((disk->d_flags & 2398 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2399 continue; 2400 } 2401 ndisks++; 2402 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 2403 dirty++; 2404 if (pdisk == NULL || 2405 pdisk->d_priority < disk->d_priority) { 2406 pdisk = disk; 2407 } 2408 } 2409 } 2410 if (dirty == 0) { 2411 /* No dirty disks at all, great. */ 2412 } else if (dirty == ndisks) { 2413 /* 2414 * Force synchronization for all dirty disks except one 2415 * with the biggest priority. 2416 */ 2417 KASSERT(pdisk != NULL, ("pdisk == NULL")); 2418 G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a " 2419 "master disk for synchronization.", 2420 g_mirror_get_diskname(pdisk), sc->sc_name); 2421 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2422 if (disk->d_sync.ds_syncid != syncid) 2423 continue; 2424 if ((disk->d_flags & 2425 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2426 continue; 2427 } 2428 KASSERT((disk->d_flags & 2429 G_MIRROR_DISK_FLAG_DIRTY) != 0, 2430 ("Disk %s isn't marked as dirty.", 2431 g_mirror_get_diskname(disk))); 2432 /* Skip the disk with the biggest priority. */ 2433 if (disk == pdisk) 2434 continue; 2435 disk->d_sync.ds_syncid = 0; 2436 } 2437 } else if (dirty < ndisks) { 2438 /* 2439 * Force synchronization for all dirty disks. 2440 * We have some non-dirty disks. 2441 */ 2442 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2443 if (disk->d_sync.ds_syncid != syncid) 2444 continue; 2445 if ((disk->d_flags & 2446 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2447 continue; 2448 } 2449 if ((disk->d_flags & 2450 G_MIRROR_DISK_FLAG_DIRTY) == 0) { 2451 continue; 2452 } 2453 disk->d_sync.ds_syncid = 0; 2454 } 2455 } 2456 2457 /* Reset hint. */ 2458 sc->sc_hint = NULL; 2459 sc->sc_syncid = syncid; 2460 if (force || broken) { 2461 /* Remember to bump syncid on first write. */ 2462 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2463 } 2464 state = G_MIRROR_DEVICE_STATE_RUNNING; 2465 G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.", 2466 sc->sc_name, g_mirror_device_state2str(sc->sc_state), 2467 g_mirror_device_state2str(state)); 2468 sc->sc_state = state; 2469 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2470 state = g_mirror_determine_state(disk); 2471 g_mirror_event_send(disk, state, 2472 G_MIRROR_EVENT_DONTWAIT); 2473 if (state == G_MIRROR_DISK_STATE_STALE) 2474 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2475 } 2476 break; 2477 } 2478 case G_MIRROR_DEVICE_STATE_RUNNING: 2479 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 && 2480 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2481 /* 2482 * No usable disks, so destroy the device. 2483 */ 2484 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2485 break; 2486 } else if (g_mirror_ndisks(sc, 2487 G_MIRROR_DISK_STATE_ACTIVE) > 0 && 2488 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2489 /* 2490 * We have active disks, launch provider if it doesn't 2491 * exist. 2492 */ 2493 if (sc->sc_provider == NULL) 2494 g_mirror_launch_provider(sc); 2495 if (sc->sc_rootmount != NULL) { 2496 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2497 __LINE__, sc->sc_rootmount); 2498 root_mount_rel(sc->sc_rootmount); 2499 sc->sc_rootmount = NULL; 2500 } 2501 } 2502 /* 2503 * Genid should be bumped immediately, so do it here. 2504 */ 2505 if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID) != 0) { 2506 sc->sc_bump_id &= ~G_MIRROR_BUMP_GENID; 2507 g_mirror_bump_genid(sc); 2508 } 2509 break; 2510 default: 2511 KASSERT(1 == 0, ("Wrong device state (%s, %s).", 2512 sc->sc_name, g_mirror_device_state2str(sc->sc_state))); 2513 break; 2514 } 2515 } 2516 2517 /* 2518 * Update disk state and device state if needed. 2519 */ 2520 #define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \ 2521 "Disk %s state changed from %s to %s (device %s).", \ 2522 g_mirror_get_diskname(disk), \ 2523 g_mirror_disk_state2str(disk->d_state), \ 2524 g_mirror_disk_state2str(state), sc->sc_name) 2525 static int 2526 g_mirror_update_disk(struct g_mirror_disk *disk, u_int state) 2527 { 2528 struct g_mirror_softc *sc; 2529 2530 sc = disk->d_softc; 2531 sx_assert(&sc->sc_lock, SX_XLOCKED); 2532 2533 again: 2534 G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.", 2535 g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state), 2536 g_mirror_disk_state2str(state)); 2537 switch (state) { 2538 case G_MIRROR_DISK_STATE_NEW: 2539 /* 2540 * Possible scenarios: 2541 * 1. New disk arrive. 2542 */ 2543 /* Previous state should be NONE. */ 2544 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE, 2545 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2546 g_mirror_disk_state2str(disk->d_state))); 2547 DISK_STATE_CHANGED(); 2548 2549 disk->d_state = state; 2550 if (LIST_EMPTY(&sc->sc_disks)) 2551 LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next); 2552 else { 2553 struct g_mirror_disk *dp; 2554 2555 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 2556 if (disk->d_priority >= dp->d_priority) { 2557 LIST_INSERT_BEFORE(dp, disk, d_next); 2558 dp = NULL; 2559 break; 2560 } 2561 if (LIST_NEXT(dp, d_next) == NULL) 2562 break; 2563 } 2564 if (dp != NULL) 2565 LIST_INSERT_AFTER(dp, disk, d_next); 2566 } 2567 G_MIRROR_DEBUG(1, "Device %s: provider %s detected.", 2568 sc->sc_name, g_mirror_get_diskname(disk)); 2569 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 2570 break; 2571 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2572 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2573 g_mirror_device_state2str(sc->sc_state), 2574 g_mirror_get_diskname(disk), 2575 g_mirror_disk_state2str(disk->d_state))); 2576 state = g_mirror_determine_state(disk); 2577 if (state != G_MIRROR_DISK_STATE_NONE) 2578 goto again; 2579 break; 2580 case G_MIRROR_DISK_STATE_ACTIVE: 2581 /* 2582 * Possible scenarios: 2583 * 1. New disk does not need synchronization. 2584 * 2. Synchronization process finished successfully. 2585 */ 2586 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2587 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2588 g_mirror_device_state2str(sc->sc_state), 2589 g_mirror_get_diskname(disk), 2590 g_mirror_disk_state2str(disk->d_state))); 2591 /* Previous state should be NEW or SYNCHRONIZING. */ 2592 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW || 2593 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2594 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2595 g_mirror_disk_state2str(disk->d_state))); 2596 DISK_STATE_CHANGED(); 2597 2598 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2599 disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2600 disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC; 2601 g_mirror_sync_stop(disk, 0); 2602 } 2603 disk->d_state = state; 2604 disk->d_sync.ds_offset = 0; 2605 disk->d_sync.ds_offset_done = 0; 2606 g_mirror_update_idle(sc, disk); 2607 g_mirror_update_metadata(disk); 2608 G_MIRROR_DEBUG(1, "Device %s: provider %s activated.", 2609 sc->sc_name, g_mirror_get_diskname(disk)); 2610 break; 2611 case G_MIRROR_DISK_STATE_STALE: 2612 /* 2613 * Possible scenarios: 2614 * 1. Stale disk was connected. 2615 */ 2616 /* Previous state should be NEW. */ 2617 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2618 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2619 g_mirror_disk_state2str(disk->d_state))); 2620 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2621 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2622 g_mirror_device_state2str(sc->sc_state), 2623 g_mirror_get_diskname(disk), 2624 g_mirror_disk_state2str(disk->d_state))); 2625 /* 2626 * STALE state is only possible if device is marked 2627 * NOAUTOSYNC. 2628 */ 2629 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0, 2630 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2631 g_mirror_device_state2str(sc->sc_state), 2632 g_mirror_get_diskname(disk), 2633 g_mirror_disk_state2str(disk->d_state))); 2634 DISK_STATE_CHANGED(); 2635 2636 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2637 disk->d_state = state; 2638 g_mirror_update_metadata(disk); 2639 G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.", 2640 sc->sc_name, g_mirror_get_diskname(disk)); 2641 break; 2642 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 2643 /* 2644 * Possible scenarios: 2645 * 1. Disk which needs synchronization was connected. 2646 */ 2647 /* Previous state should be NEW. */ 2648 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2649 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2650 g_mirror_disk_state2str(disk->d_state))); 2651 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2652 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2653 g_mirror_device_state2str(sc->sc_state), 2654 g_mirror_get_diskname(disk), 2655 g_mirror_disk_state2str(disk->d_state))); 2656 DISK_STATE_CHANGED(); 2657 2658 if (disk->d_state == G_MIRROR_DISK_STATE_NEW) 2659 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2660 disk->d_state = state; 2661 if (sc->sc_provider != NULL) { 2662 g_mirror_sync_start(disk); 2663 g_mirror_update_metadata(disk); 2664 } 2665 break; 2666 case G_MIRROR_DISK_STATE_DISCONNECTED: 2667 /* 2668 * Possible scenarios: 2669 * 1. Device wasn't running yet, but disk disappear. 2670 * 2. Disk was active and disapppear. 2671 * 3. Disk disappear during synchronization process. 2672 */ 2673 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) { 2674 /* 2675 * Previous state should be ACTIVE, STALE or 2676 * SYNCHRONIZING. 2677 */ 2678 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 2679 disk->d_state == G_MIRROR_DISK_STATE_STALE || 2680 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2681 ("Wrong disk state (%s, %s).", 2682 g_mirror_get_diskname(disk), 2683 g_mirror_disk_state2str(disk->d_state))); 2684 } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) { 2685 /* Previous state should be NEW. */ 2686 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2687 ("Wrong disk state (%s, %s).", 2688 g_mirror_get_diskname(disk), 2689 g_mirror_disk_state2str(disk->d_state))); 2690 /* 2691 * Reset bumping syncid if disk disappeared in STARTING 2692 * state. 2693 */ 2694 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) 2695 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 2696 #ifdef INVARIANTS 2697 } else { 2698 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).", 2699 sc->sc_name, 2700 g_mirror_device_state2str(sc->sc_state), 2701 g_mirror_get_diskname(disk), 2702 g_mirror_disk_state2str(disk->d_state))); 2703 #endif 2704 } 2705 DISK_STATE_CHANGED(); 2706 G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.", 2707 sc->sc_name, g_mirror_get_diskname(disk)); 2708 2709 g_mirror_destroy_disk(disk); 2710 break; 2711 case G_MIRROR_DISK_STATE_DESTROY: 2712 { 2713 int error; 2714 2715 error = g_mirror_clear_metadata(disk); 2716 if (error != 0) { 2717 G_MIRROR_DEBUG(0, 2718 "Device %s: failed to clear metadata on %s: %d.", 2719 sc->sc_name, g_mirror_get_diskname(disk), error); 2720 break; 2721 } 2722 DISK_STATE_CHANGED(); 2723 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", 2724 sc->sc_name, g_mirror_get_diskname(disk)); 2725 2726 g_mirror_destroy_disk(disk); 2727 sc->sc_ndisks--; 2728 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2729 g_mirror_update_metadata(disk); 2730 } 2731 break; 2732 } 2733 default: 2734 KASSERT(1 == 0, ("Unknown state (%u).", state)); 2735 break; 2736 } 2737 return (0); 2738 } 2739 #undef DISK_STATE_CHANGED 2740 2741 int 2742 g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md) 2743 { 2744 struct g_provider *pp; 2745 u_char *buf; 2746 int error; 2747 2748 g_topology_assert(); 2749 2750 error = g_access(cp, 1, 0, 0); 2751 if (error != 0) 2752 return (error); 2753 pp = cp->provider; 2754 g_topology_unlock(); 2755 /* Metadata are stored on last sector. */ 2756 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 2757 &error); 2758 g_topology_lock(); 2759 g_access(cp, -1, 0, 0); 2760 if (buf == NULL) { 2761 G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).", 2762 cp->provider->name, error); 2763 return (error); 2764 } 2765 2766 /* Decode metadata. */ 2767 error = mirror_metadata_decode(buf, md); 2768 g_free(buf); 2769 if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0) 2770 return (EINVAL); 2771 if (md->md_version > G_MIRROR_VERSION) { 2772 G_MIRROR_DEBUG(0, 2773 "Kernel module is too old to handle metadata from %s.", 2774 cp->provider->name); 2775 return (EINVAL); 2776 } 2777 if (error != 0) { 2778 G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.", 2779 cp->provider->name); 2780 return (error); 2781 } 2782 2783 return (0); 2784 } 2785 2786 static int 2787 g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp, 2788 struct g_mirror_metadata *md) 2789 { 2790 2791 if (g_mirror_id2disk(sc, md->md_did) != NULL) { 2792 G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.", 2793 pp->name, md->md_did); 2794 return (EEXIST); 2795 } 2796 if (md->md_all != sc->sc_ndisks) { 2797 G_MIRROR_DEBUG(1, 2798 "Invalid '%s' field on disk %s (device %s), skipping.", 2799 "md_all", pp->name, sc->sc_name); 2800 return (EINVAL); 2801 } 2802 if (md->md_slice != sc->sc_slice) { 2803 G_MIRROR_DEBUG(1, 2804 "Invalid '%s' field on disk %s (device %s), skipping.", 2805 "md_slice", pp->name, sc->sc_name); 2806 return (EINVAL); 2807 } 2808 if (md->md_balance != sc->sc_balance) { 2809 G_MIRROR_DEBUG(1, 2810 "Invalid '%s' field on disk %s (device %s), skipping.", 2811 "md_balance", pp->name, sc->sc_name); 2812 return (EINVAL); 2813 } 2814 #if 0 2815 if (md->md_mediasize != sc->sc_mediasize) { 2816 G_MIRROR_DEBUG(1, 2817 "Invalid '%s' field on disk %s (device %s), skipping.", 2818 "md_mediasize", pp->name, sc->sc_name); 2819 return (EINVAL); 2820 } 2821 #endif 2822 if (sc->sc_mediasize > pp->mediasize) { 2823 G_MIRROR_DEBUG(1, 2824 "Invalid size of disk %s (device %s), skipping.", pp->name, 2825 sc->sc_name); 2826 return (EINVAL); 2827 } 2828 if (md->md_sectorsize != sc->sc_sectorsize) { 2829 G_MIRROR_DEBUG(1, 2830 "Invalid '%s' field on disk %s (device %s), skipping.", 2831 "md_sectorsize", pp->name, sc->sc_name); 2832 return (EINVAL); 2833 } 2834 if ((sc->sc_sectorsize % pp->sectorsize) != 0) { 2835 G_MIRROR_DEBUG(1, 2836 "Invalid sector size of disk %s (device %s), skipping.", 2837 pp->name, sc->sc_name); 2838 return (EINVAL); 2839 } 2840 if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) { 2841 G_MIRROR_DEBUG(1, 2842 "Invalid device flags on disk %s (device %s), skipping.", 2843 pp->name, sc->sc_name); 2844 return (EINVAL); 2845 } 2846 if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) { 2847 G_MIRROR_DEBUG(1, 2848 "Invalid disk flags on disk %s (device %s), skipping.", 2849 pp->name, sc->sc_name); 2850 return (EINVAL); 2851 } 2852 return (0); 2853 } 2854 2855 int 2856 g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp, 2857 struct g_mirror_metadata *md) 2858 { 2859 struct g_mirror_disk *disk; 2860 int error; 2861 2862 g_topology_assert_not(); 2863 G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name); 2864 2865 error = g_mirror_check_metadata(sc, pp, md); 2866 if (error != 0) 2867 return (error); 2868 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING && 2869 md->md_genid < sc->sc_genid) { 2870 G_MIRROR_DEBUG(0, "Component %s (device %s) broken, skipping.", 2871 pp->name, sc->sc_name); 2872 return (EINVAL); 2873 } 2874 disk = g_mirror_init_disk(sc, pp, md, &error); 2875 if (disk == NULL) 2876 return (error); 2877 error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW, 2878 G_MIRROR_EVENT_WAIT); 2879 if (error != 0) 2880 return (error); 2881 if (md->md_version < G_MIRROR_VERSION) { 2882 G_MIRROR_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).", 2883 pp->name, md->md_version, G_MIRROR_VERSION); 2884 g_mirror_update_metadata(disk); 2885 } 2886 return (0); 2887 } 2888 2889 static void 2890 g_mirror_destroy_delayed(void *arg, int flag) 2891 { 2892 struct g_mirror_softc *sc; 2893 int error; 2894 2895 if (flag == EV_CANCEL) { 2896 G_MIRROR_DEBUG(1, "Destroying canceled."); 2897 return; 2898 } 2899 sc = arg; 2900 g_topology_unlock(); 2901 sx_xlock(&sc->sc_lock); 2902 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) == 0, 2903 ("DESTROY flag set on %s.", sc->sc_name)); 2904 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0, 2905 ("DESTROYING flag not set on %s.", sc->sc_name)); 2906 G_MIRROR_DEBUG(1, "Destroying %s (delayed).", sc->sc_name); 2907 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_SOFT); 2908 if (error != 0) { 2909 G_MIRROR_DEBUG(0, "Cannot destroy %s (error=%d).", 2910 sc->sc_name, error); 2911 sx_xunlock(&sc->sc_lock); 2912 } 2913 g_topology_lock(); 2914 } 2915 2916 static int 2917 g_mirror_access(struct g_provider *pp, int acr, int acw, int ace) 2918 { 2919 struct g_mirror_softc *sc; 2920 int error = 0; 2921 2922 g_topology_assert(); 2923 G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr, 2924 acw, ace); 2925 2926 sc = pp->private; 2927 KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name)); 2928 2929 g_topology_unlock(); 2930 sx_xlock(&sc->sc_lock); 2931 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0 || 2932 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0 || 2933 LIST_EMPTY(&sc->sc_disks)) { 2934 if (acr > 0 || acw > 0 || ace > 0) 2935 error = ENXIO; 2936 goto end; 2937 } 2938 sc->sc_provider_open += acr + acw + ace; 2939 if (pp->acw + acw == 0) 2940 g_mirror_idle(sc, 0); 2941 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0 && 2942 sc->sc_provider_open == 0) 2943 g_post_event(g_mirror_destroy_delayed, sc, M_WAITOK, sc, NULL); 2944 end: 2945 sx_xunlock(&sc->sc_lock); 2946 g_topology_lock(); 2947 return (error); 2948 } 2949 2950 struct g_geom * 2951 g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md, 2952 u_int type) 2953 { 2954 struct g_mirror_softc *sc; 2955 struct g_geom *gp; 2956 int error, timeout; 2957 2958 g_topology_assert(); 2959 G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name, 2960 md->md_mid); 2961 2962 /* One disk is minimum. */ 2963 if (md->md_all < 1) 2964 return (NULL); 2965 /* 2966 * Action geom. 2967 */ 2968 gp = g_new_geomf(mp, "%s", md->md_name); 2969 sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO); 2970 gp->start = g_mirror_start; 2971 gp->orphan = g_mirror_orphan; 2972 gp->access = g_mirror_access; 2973 gp->dumpconf = g_mirror_dumpconf; 2974 2975 sc->sc_type = type; 2976 sc->sc_id = md->md_mid; 2977 sc->sc_slice = md->md_slice; 2978 sc->sc_balance = md->md_balance; 2979 sc->sc_mediasize = md->md_mediasize; 2980 sc->sc_sectorsize = md->md_sectorsize; 2981 sc->sc_ndisks = md->md_all; 2982 sc->sc_flags = md->md_mflags; 2983 sc->sc_bump_id = 0; 2984 sc->sc_idle = 1; 2985 sc->sc_last_write = time_uptime; 2986 sc->sc_writes = 0; 2987 sc->sc_refcnt = 1; 2988 sx_init(&sc->sc_lock, "gmirror:lock"); 2989 bioq_init(&sc->sc_queue); 2990 mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF); 2991 bioq_init(&sc->sc_regular_delayed); 2992 bioq_init(&sc->sc_inflight); 2993 bioq_init(&sc->sc_sync_delayed); 2994 LIST_INIT(&sc->sc_disks); 2995 TAILQ_INIT(&sc->sc_events); 2996 mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF); 2997 callout_init(&sc->sc_callout, 1); 2998 mtx_init(&sc->sc_done_mtx, "gmirror:done", NULL, MTX_DEF); 2999 sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING; 3000 gp->softc = sc; 3001 sc->sc_geom = gp; 3002 sc->sc_provider = NULL; 3003 sc->sc_provider_open = 0; 3004 /* 3005 * Synchronization geom. 3006 */ 3007 gp = g_new_geomf(mp, "%s.sync", md->md_name); 3008 gp->softc = sc; 3009 gp->orphan = g_mirror_orphan; 3010 sc->sc_sync.ds_geom = gp; 3011 sc->sc_sync.ds_ndisks = 0; 3012 error = kproc_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0, 3013 "g_mirror %s", md->md_name); 3014 if (error != 0) { 3015 G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.", 3016 sc->sc_name); 3017 g_destroy_geom(sc->sc_sync.ds_geom); 3018 g_destroy_geom(sc->sc_geom); 3019 g_mirror_free_device(sc); 3020 return (NULL); 3021 } 3022 3023 G_MIRROR_DEBUG(1, "Device %s created (%u components, id=%u).", 3024 sc->sc_name, sc->sc_ndisks, sc->sc_id); 3025 3026 sc->sc_rootmount = root_mount_hold("GMIRROR"); 3027 G_MIRROR_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount); 3028 /* 3029 * Run timeout. 3030 */ 3031 timeout = g_mirror_timeout * hz; 3032 callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc); 3033 return (sc->sc_geom); 3034 } 3035 3036 int 3037 g_mirror_destroy(struct g_mirror_softc *sc, int how) 3038 { 3039 struct g_mirror_disk *disk; 3040 3041 g_topology_assert_not(); 3042 sx_assert(&sc->sc_lock, SX_XLOCKED); 3043 3044 if (sc->sc_provider_open != 0) { 3045 switch (how) { 3046 case G_MIRROR_DESTROY_SOFT: 3047 G_MIRROR_DEBUG(1, 3048 "Device %s is still open (%d).", sc->sc_name, 3049 sc->sc_provider_open); 3050 return (EBUSY); 3051 case G_MIRROR_DESTROY_DELAYED: 3052 G_MIRROR_DEBUG(1, 3053 "Device %s will be destroyed on last close.", 3054 sc->sc_name); 3055 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 3056 if (disk->d_state == 3057 G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3058 g_mirror_sync_stop(disk, 1); 3059 } 3060 } 3061 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROYING; 3062 return (EBUSY); 3063 case G_MIRROR_DESTROY_HARD: 3064 G_MIRROR_DEBUG(1, "Device %s is still open, so it " 3065 "can't be definitely removed.", sc->sc_name); 3066 } 3067 } 3068 3069 g_topology_lock(); 3070 if (sc->sc_geom->softc == NULL) { 3071 g_topology_unlock(); 3072 return (0); 3073 } 3074 sc->sc_geom->softc = NULL; 3075 sc->sc_sync.ds_geom->softc = NULL; 3076 g_topology_unlock(); 3077 3078 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 3079 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_WAIT; 3080 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 3081 sx_xunlock(&sc->sc_lock); 3082 mtx_lock(&sc->sc_queue_mtx); 3083 wakeup(sc); 3084 mtx_unlock(&sc->sc_queue_mtx); 3085 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker); 3086 while (sc->sc_worker != NULL) 3087 tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5); 3088 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker); 3089 sx_xlock(&sc->sc_lock); 3090 g_mirror_destroy_device(sc); 3091 return (0); 3092 } 3093 3094 static void 3095 g_mirror_taste_orphan(struct g_consumer *cp) 3096 { 3097 3098 KASSERT(1 == 0, ("%s called while tasting %s.", __func__, 3099 cp->provider->name)); 3100 } 3101 3102 static struct g_geom * 3103 g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 3104 { 3105 struct g_mirror_metadata md; 3106 struct g_mirror_softc *sc; 3107 struct g_consumer *cp; 3108 struct g_geom *gp; 3109 int error; 3110 3111 g_topology_assert(); 3112 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 3113 G_MIRROR_DEBUG(2, "Tasting %s.", pp->name); 3114 3115 gp = g_new_geomf(mp, "mirror:taste"); 3116 /* 3117 * This orphan function should be never called. 3118 */ 3119 gp->orphan = g_mirror_taste_orphan; 3120 cp = g_new_consumer(gp); 3121 g_attach(cp, pp); 3122 error = g_mirror_read_metadata(cp, &md); 3123 g_detach(cp); 3124 g_destroy_consumer(cp); 3125 g_destroy_geom(gp); 3126 if (error != 0) 3127 return (NULL); 3128 gp = NULL; 3129 3130 if (md.md_provider[0] != '\0' && 3131 !g_compare_names(md.md_provider, pp->name)) 3132 return (NULL); 3133 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize) 3134 return (NULL); 3135 if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) { 3136 G_MIRROR_DEBUG(0, 3137 "Device %s: provider %s marked as inactive, skipping.", 3138 md.md_name, pp->name); 3139 return (NULL); 3140 } 3141 if (g_mirror_debug >= 2) 3142 mirror_metadata_dump(&md); 3143 3144 /* 3145 * Let's check if device already exists. 3146 */ 3147 sc = NULL; 3148 LIST_FOREACH(gp, &mp->geom, geom) { 3149 sc = gp->softc; 3150 if (sc == NULL) 3151 continue; 3152 if (sc->sc_type != G_MIRROR_TYPE_AUTOMATIC) 3153 continue; 3154 if (sc->sc_sync.ds_geom == gp) 3155 continue; 3156 if (strcmp(md.md_name, sc->sc_name) != 0) 3157 continue; 3158 if (md.md_mid != sc->sc_id) { 3159 G_MIRROR_DEBUG(0, "Device %s already configured.", 3160 sc->sc_name); 3161 return (NULL); 3162 } 3163 break; 3164 } 3165 if (gp == NULL) { 3166 gp = g_mirror_create(mp, &md, G_MIRROR_TYPE_AUTOMATIC); 3167 if (gp == NULL) { 3168 G_MIRROR_DEBUG(0, "Cannot create device %s.", 3169 md.md_name); 3170 return (NULL); 3171 } 3172 sc = gp->softc; 3173 } 3174 G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name); 3175 g_topology_unlock(); 3176 sx_xlock(&sc->sc_lock); 3177 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_TASTING; 3178 error = g_mirror_add_disk(sc, pp, &md); 3179 if (error != 0) { 3180 G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).", 3181 pp->name, gp->name, error); 3182 if (LIST_EMPTY(&sc->sc_disks)) { 3183 g_cancel_event(sc); 3184 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3185 g_topology_lock(); 3186 return (NULL); 3187 } 3188 gp = NULL; 3189 } 3190 sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_TASTING; 3191 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 3192 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3193 g_topology_lock(); 3194 return (NULL); 3195 } 3196 sx_xunlock(&sc->sc_lock); 3197 g_topology_lock(); 3198 return (gp); 3199 } 3200 3201 static void 3202 g_mirror_resize(struct g_consumer *cp) 3203 { 3204 struct g_mirror_disk *disk; 3205 3206 g_topology_assert(); 3207 g_trace(G_T_TOPOLOGY, "%s(%s)", __func__, cp->provider->name); 3208 3209 disk = cp->private; 3210 if (disk == NULL) 3211 return; 3212 g_topology_unlock(); 3213 g_mirror_update_metadata(disk); 3214 g_topology_lock(); 3215 } 3216 3217 static int 3218 g_mirror_destroy_geom(struct gctl_req *req __unused, 3219 struct g_class *mp __unused, struct g_geom *gp) 3220 { 3221 struct g_mirror_softc *sc; 3222 int error; 3223 3224 g_topology_unlock(); 3225 sc = gp->softc; 3226 sx_xlock(&sc->sc_lock); 3227 g_cancel_event(sc); 3228 error = g_mirror_destroy(gp->softc, G_MIRROR_DESTROY_SOFT); 3229 if (error != 0) 3230 sx_xunlock(&sc->sc_lock); 3231 g_topology_lock(); 3232 return (error); 3233 } 3234 3235 static void 3236 g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 3237 struct g_consumer *cp, struct g_provider *pp) 3238 { 3239 struct g_mirror_softc *sc; 3240 3241 g_topology_assert(); 3242 3243 sc = gp->softc; 3244 if (sc == NULL) 3245 return; 3246 /* Skip synchronization geom. */ 3247 if (gp == sc->sc_sync.ds_geom) 3248 return; 3249 if (pp != NULL) { 3250 /* Nothing here. */ 3251 } else if (cp != NULL) { 3252 struct g_mirror_disk *disk; 3253 3254 disk = cp->private; 3255 if (disk == NULL) 3256 return; 3257 g_topology_unlock(); 3258 sx_xlock(&sc->sc_lock); 3259 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id); 3260 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3261 sbuf_printf(sb, "%s<Synchronized>", indent); 3262 if (disk->d_sync.ds_offset == 0) 3263 sbuf_printf(sb, "0%%"); 3264 else { 3265 sbuf_printf(sb, "%u%%", 3266 (u_int)((disk->d_sync.ds_offset * 100) / 3267 sc->sc_provider->mediasize)); 3268 } 3269 sbuf_printf(sb, "</Synchronized>\n"); 3270 if (disk->d_sync.ds_offset > 0) { 3271 sbuf_printf(sb, "%s<BytesSynced>%jd" 3272 "</BytesSynced>\n", indent, 3273 (intmax_t)disk->d_sync.ds_offset); 3274 } 3275 } 3276 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, 3277 disk->d_sync.ds_syncid); 3278 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, 3279 disk->d_genid); 3280 sbuf_printf(sb, "%s<Flags>", indent); 3281 if (disk->d_flags == 0) 3282 sbuf_printf(sb, "NONE"); 3283 else { 3284 int first = 1; 3285 3286 #define ADD_FLAG(flag, name) do { \ 3287 if ((disk->d_flags & (flag)) != 0) { \ 3288 if (!first) \ 3289 sbuf_printf(sb, ", "); \ 3290 else \ 3291 first = 0; \ 3292 sbuf_printf(sb, name); \ 3293 } \ 3294 } while (0) 3295 ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY"); 3296 ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED"); 3297 ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE"); 3298 ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING, 3299 "SYNCHRONIZING"); 3300 ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC"); 3301 ADD_FLAG(G_MIRROR_DISK_FLAG_BROKEN, "BROKEN"); 3302 #undef ADD_FLAG 3303 } 3304 sbuf_printf(sb, "</Flags>\n"); 3305 sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent, 3306 disk->d_priority); 3307 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 3308 g_mirror_disk_state2str(disk->d_state)); 3309 sx_xunlock(&sc->sc_lock); 3310 g_topology_lock(); 3311 } else { 3312 g_topology_unlock(); 3313 sx_xlock(&sc->sc_lock); 3314 sbuf_printf(sb, "%s<Type>", indent); 3315 switch (sc->sc_type) { 3316 case G_MIRROR_TYPE_AUTOMATIC: 3317 sbuf_printf(sb, "AUTOMATIC"); 3318 break; 3319 case G_MIRROR_TYPE_MANUAL: 3320 sbuf_printf(sb, "MANUAL"); 3321 break; 3322 default: 3323 sbuf_printf(sb, "UNKNOWN"); 3324 break; 3325 } 3326 sbuf_printf(sb, "</Type>\n"); 3327 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id); 3328 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid); 3329 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid); 3330 sbuf_printf(sb, "%s<Flags>", indent); 3331 if (sc->sc_flags == 0) 3332 sbuf_printf(sb, "NONE"); 3333 else { 3334 int first = 1; 3335 3336 #define ADD_FLAG(flag, name) do { \ 3337 if ((sc->sc_flags & (flag)) != 0) { \ 3338 if (!first) \ 3339 sbuf_printf(sb, ", "); \ 3340 else \ 3341 first = 0; \ 3342 sbuf_printf(sb, name); \ 3343 } \ 3344 } while (0) 3345 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC"); 3346 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC"); 3347 #undef ADD_FLAG 3348 } 3349 sbuf_printf(sb, "</Flags>\n"); 3350 sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent, 3351 (u_int)sc->sc_slice); 3352 sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent, 3353 balance_name(sc->sc_balance)); 3354 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent, 3355 sc->sc_ndisks); 3356 sbuf_printf(sb, "%s<State>", indent); 3357 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 3358 sbuf_printf(sb, "%s", "STARTING"); 3359 else if (sc->sc_ndisks == 3360 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE)) 3361 sbuf_printf(sb, "%s", "COMPLETE"); 3362 else 3363 sbuf_printf(sb, "%s", "DEGRADED"); 3364 sbuf_printf(sb, "</State>\n"); 3365 sx_xunlock(&sc->sc_lock); 3366 g_topology_lock(); 3367 } 3368 } 3369 3370 static void 3371 g_mirror_shutdown_post_sync(void *arg, int howto) 3372 { 3373 struct g_class *mp; 3374 struct g_geom *gp, *gp2; 3375 struct g_mirror_softc *sc; 3376 int error; 3377 3378 if (panicstr != NULL) 3379 return; 3380 3381 mp = arg; 3382 g_topology_lock(); 3383 g_mirror_shutdown = 1; 3384 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 3385 if ((sc = gp->softc) == NULL) 3386 continue; 3387 /* Skip synchronization geom. */ 3388 if (gp == sc->sc_sync.ds_geom) 3389 continue; 3390 g_topology_unlock(); 3391 sx_xlock(&sc->sc_lock); 3392 g_mirror_idle(sc, -1); 3393 g_cancel_event(sc); 3394 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_DELAYED); 3395 if (error != 0) 3396 sx_xunlock(&sc->sc_lock); 3397 g_topology_lock(); 3398 } 3399 g_topology_unlock(); 3400 } 3401 3402 static void 3403 g_mirror_init(struct g_class *mp) 3404 { 3405 3406 g_mirror_post_sync = EVENTHANDLER_REGISTER(shutdown_post_sync, 3407 g_mirror_shutdown_post_sync, mp, SHUTDOWN_PRI_FIRST); 3408 if (g_mirror_post_sync == NULL) 3409 G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event."); 3410 } 3411 3412 static void 3413 g_mirror_fini(struct g_class *mp) 3414 { 3415 3416 if (g_mirror_post_sync != NULL) 3417 EVENTHANDLER_DEREGISTER(shutdown_post_sync, g_mirror_post_sync); 3418 } 3419 3420 DECLARE_GEOM_CLASS(g_mirror_class, g_mirror); 3421