1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/bio.h> 35 #include <sys/eventhandler.h> 36 #include <sys/fail.h> 37 #include <sys/kernel.h> 38 #include <sys/kthread.h> 39 #include <sys/limits.h> 40 #include <sys/lock.h> 41 #include <sys/malloc.h> 42 #include <sys/mutex.h> 43 #include <sys/proc.h> 44 #include <sys/sbuf.h> 45 #include <sys/sched.h> 46 #include <sys/sx.h> 47 #include <sys/sysctl.h> 48 49 #include <geom/geom.h> 50 #include <geom/geom_dbg.h> 51 #include <geom/mirror/g_mirror.h> 52 53 FEATURE(geom_mirror, "GEOM mirroring support"); 54 55 static MALLOC_DEFINE(M_MIRROR, "mirror_data", "GEOM_MIRROR Data"); 56 57 SYSCTL_DECL(_kern_geom); 58 static SYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 59 "GEOM_MIRROR stuff"); 60 int g_mirror_debug = 0; 61 SYSCTL_INT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RWTUN, &g_mirror_debug, 0, 62 "Debug level"); 63 bool g_launch_mirror_before_timeout = true; 64 SYSCTL_BOOL(_kern_geom_mirror, OID_AUTO, launch_mirror_before_timeout, 65 CTLFLAG_RWTUN, &g_launch_mirror_before_timeout, 0, 66 "If false, force gmirror to wait out the full kern.geom.mirror.timeout " 67 "before launching mirrors"); 68 static u_int g_mirror_timeout = 4; 69 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RWTUN, &g_mirror_timeout, 70 0, "Time to wait on all mirror components"); 71 static u_int g_mirror_idletime = 5; 72 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, idletime, CTLFLAG_RWTUN, 73 &g_mirror_idletime, 0, "Mark components as clean when idling"); 74 static u_int g_mirror_disconnect_on_failure = 1; 75 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, disconnect_on_failure, CTLFLAG_RWTUN, 76 &g_mirror_disconnect_on_failure, 0, "Disconnect component on I/O failure."); 77 static u_int g_mirror_syncreqs = 2; 78 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_requests, CTLFLAG_RDTUN, 79 &g_mirror_syncreqs, 0, "Parallel synchronization I/O requests."); 80 static u_int g_mirror_sync_period = 5; 81 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_update_period, CTLFLAG_RWTUN, 82 &g_mirror_sync_period, 0, 83 "Metadata update period during synchronization, in seconds"); 84 85 #define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \ 86 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \ 87 msleep((ident), (mtx), (priority), (wmesg), (timeout)); \ 88 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \ 89 } while (0) 90 91 static eventhandler_tag g_mirror_post_sync = NULL; 92 static int g_mirror_shutdown = 0; 93 94 static g_ctl_destroy_geom_t g_mirror_destroy_geom; 95 static g_taste_t g_mirror_taste; 96 static g_init_t g_mirror_init; 97 static g_fini_t g_mirror_fini; 98 static g_provgone_t g_mirror_providergone; 99 static g_resize_t g_mirror_resize; 100 101 struct g_class g_mirror_class = { 102 .name = G_MIRROR_CLASS_NAME, 103 .version = G_VERSION, 104 .ctlreq = g_mirror_config, 105 .taste = g_mirror_taste, 106 .destroy_geom = g_mirror_destroy_geom, 107 .init = g_mirror_init, 108 .fini = g_mirror_fini, 109 .providergone = g_mirror_providergone, 110 .resize = g_mirror_resize 111 }; 112 113 static void g_mirror_destroy_provider(struct g_mirror_softc *sc); 114 static int g_mirror_update_disk(struct g_mirror_disk *disk, u_int state); 115 static void g_mirror_update_device(struct g_mirror_softc *sc, bool force); 116 static void g_mirror_dumpconf(struct sbuf *sb, const char *indent, 117 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp); 118 static void g_mirror_timeout_drain(struct g_mirror_softc *sc); 119 static int g_mirror_refresh_device(struct g_mirror_softc *sc, 120 const struct g_provider *pp, const struct g_mirror_metadata *md); 121 static void g_mirror_sync_reinit(const struct g_mirror_disk *disk, 122 struct bio *bp, off_t offset); 123 static void g_mirror_sync_stop(struct g_mirror_disk *disk, int type); 124 static void g_mirror_register_request(struct g_mirror_softc *sc, 125 struct bio *bp); 126 static void g_mirror_sync_release(struct g_mirror_softc *sc); 127 128 static const char * 129 g_mirror_disk_state2str(int state) 130 { 131 132 switch (state) { 133 case G_MIRROR_DISK_STATE_NONE: 134 return ("NONE"); 135 case G_MIRROR_DISK_STATE_NEW: 136 return ("NEW"); 137 case G_MIRROR_DISK_STATE_ACTIVE: 138 return ("ACTIVE"); 139 case G_MIRROR_DISK_STATE_STALE: 140 return ("STALE"); 141 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 142 return ("SYNCHRONIZING"); 143 case G_MIRROR_DISK_STATE_DISCONNECTED: 144 return ("DISCONNECTED"); 145 case G_MIRROR_DISK_STATE_DESTROY: 146 return ("DESTROY"); 147 default: 148 return ("INVALID"); 149 } 150 } 151 152 static const char * 153 g_mirror_device_state2str(int state) 154 { 155 156 switch (state) { 157 case G_MIRROR_DEVICE_STATE_STARTING: 158 return ("STARTING"); 159 case G_MIRROR_DEVICE_STATE_RUNNING: 160 return ("RUNNING"); 161 default: 162 return ("INVALID"); 163 } 164 } 165 166 static const char * 167 g_mirror_get_diskname(struct g_mirror_disk *disk) 168 { 169 170 if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL) 171 return ("[unknown]"); 172 return (disk->d_name); 173 } 174 175 /* 176 * --- Events handling functions --- 177 * Events in geom_mirror are used to maintain disks and device status 178 * from one thread to simplify locking. 179 */ 180 static void 181 g_mirror_event_free(struct g_mirror_event *ep) 182 { 183 184 free(ep, M_MIRROR); 185 } 186 187 static int 188 g_mirror_event_dispatch(struct g_mirror_event *ep, void *arg, int state, 189 int flags) 190 { 191 struct g_mirror_softc *sc; 192 struct g_mirror_disk *disk; 193 int error; 194 195 G_MIRROR_DEBUG(4, "%s: Sending event %p.", __func__, ep); 196 if ((flags & G_MIRROR_EVENT_DEVICE) != 0) { 197 disk = NULL; 198 sc = arg; 199 } else { 200 disk = arg; 201 sc = disk->d_softc; 202 } 203 ep->e_disk = disk; 204 ep->e_state = state; 205 ep->e_flags = flags; 206 ep->e_error = 0; 207 mtx_lock(&sc->sc_events_mtx); 208 TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next); 209 mtx_unlock(&sc->sc_events_mtx); 210 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 211 mtx_lock(&sc->sc_queue_mtx); 212 wakeup(sc); 213 mtx_unlock(&sc->sc_queue_mtx); 214 if ((flags & G_MIRROR_EVENT_DONTWAIT) != 0) 215 return (0); 216 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep); 217 sx_xunlock(&sc->sc_lock); 218 while ((ep->e_flags & G_MIRROR_EVENT_DONE) == 0) { 219 mtx_lock(&sc->sc_events_mtx); 220 MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "m:event", 221 hz * 5); 222 } 223 error = ep->e_error; 224 g_mirror_event_free(ep); 225 sx_xlock(&sc->sc_lock); 226 return (error); 227 } 228 229 int 230 g_mirror_event_send(void *arg, int state, int flags) 231 { 232 struct g_mirror_event *ep; 233 234 ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK); 235 return (g_mirror_event_dispatch(ep, arg, state, flags)); 236 } 237 238 static struct g_mirror_event * 239 g_mirror_event_first(struct g_mirror_softc *sc) 240 { 241 struct g_mirror_event *ep; 242 243 mtx_lock(&sc->sc_events_mtx); 244 ep = TAILQ_FIRST(&sc->sc_events); 245 mtx_unlock(&sc->sc_events_mtx); 246 return (ep); 247 } 248 249 static void 250 g_mirror_event_remove(struct g_mirror_softc *sc, struct g_mirror_event *ep) 251 { 252 253 mtx_lock(&sc->sc_events_mtx); 254 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 255 mtx_unlock(&sc->sc_events_mtx); 256 } 257 258 static void 259 g_mirror_event_cancel(struct g_mirror_disk *disk) 260 { 261 struct g_mirror_softc *sc; 262 struct g_mirror_event *ep, *tmpep; 263 264 sc = disk->d_softc; 265 sx_assert(&sc->sc_lock, SX_XLOCKED); 266 267 mtx_lock(&sc->sc_events_mtx); 268 TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) { 269 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) 270 continue; 271 if (ep->e_disk != disk) 272 continue; 273 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 274 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 275 g_mirror_event_free(ep); 276 else { 277 ep->e_error = ECANCELED; 278 wakeup(ep); 279 } 280 } 281 mtx_unlock(&sc->sc_events_mtx); 282 } 283 284 /* 285 * Return the number of disks in given state. 286 * If state is equal to -1, count all connected disks. 287 */ 288 u_int 289 g_mirror_ndisks(struct g_mirror_softc *sc, int state) 290 { 291 struct g_mirror_disk *disk; 292 u_int n = 0; 293 294 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 295 if (state == -1 || disk->d_state == state) 296 n++; 297 } 298 return (n); 299 } 300 301 /* 302 * Find a disk in mirror by its disk ID. 303 */ 304 static struct g_mirror_disk * 305 g_mirror_id2disk(struct g_mirror_softc *sc, uint32_t id) 306 { 307 struct g_mirror_disk *disk; 308 309 sx_assert(&sc->sc_lock, SX_XLOCKED); 310 311 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 312 if (disk->d_id == id) 313 return (disk); 314 } 315 return (NULL); 316 } 317 318 static u_int 319 g_mirror_nrequests(struct g_mirror_softc *sc, struct g_consumer *cp) 320 { 321 struct bio *bp; 322 u_int nreqs = 0; 323 324 mtx_lock(&sc->sc_queue_mtx); 325 TAILQ_FOREACH(bp, &sc->sc_queue, bio_queue) { 326 if (bp->bio_from == cp) 327 nreqs++; 328 } 329 mtx_unlock(&sc->sc_queue_mtx); 330 return (nreqs); 331 } 332 333 static int 334 g_mirror_is_busy(struct g_mirror_softc *sc, struct g_consumer *cp) 335 { 336 337 if (cp->index > 0) { 338 G_MIRROR_DEBUG(2, 339 "I/O requests for %s exist, can't destroy it now.", 340 cp->provider->name); 341 return (1); 342 } 343 if (g_mirror_nrequests(sc, cp) > 0) { 344 G_MIRROR_DEBUG(2, 345 "I/O requests for %s in queue, can't destroy it now.", 346 cp->provider->name); 347 return (1); 348 } 349 return (0); 350 } 351 352 static void 353 g_mirror_destroy_consumer(void *arg, int flags __unused) 354 { 355 struct g_consumer *cp; 356 357 g_topology_assert(); 358 359 cp = arg; 360 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", cp->provider->name); 361 g_detach(cp); 362 g_destroy_consumer(cp); 363 } 364 365 static void 366 g_mirror_kill_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 367 { 368 struct g_provider *pp; 369 int retaste_wait; 370 371 g_topology_assert(); 372 373 cp->private = NULL; 374 if (g_mirror_is_busy(sc, cp)) 375 return; 376 pp = cp->provider; 377 retaste_wait = 0; 378 if (cp->acw == 1) { 379 if ((pp->geom->flags & G_GEOM_WITHER) == 0) 380 retaste_wait = 1; 381 } 382 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", pp->name, -cp->acr, 383 -cp->acw, -cp->ace, 0); 384 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 385 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 386 if (retaste_wait) { 387 /* 388 * After retaste event was send (inside g_access()), we can send 389 * event to detach and destroy consumer. 390 * A class, which has consumer to the given provider connected 391 * will not receive retaste event for the provider. 392 * This is the way how I ignore retaste events when I close 393 * consumers opened for write: I detach and destroy consumer 394 * after retaste event is sent. 395 */ 396 g_post_event(g_mirror_destroy_consumer, cp, M_WAITOK, NULL); 397 return; 398 } 399 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", pp->name); 400 g_detach(cp); 401 g_destroy_consumer(cp); 402 } 403 404 static int 405 g_mirror_connect_disk(struct g_mirror_disk *disk, struct g_provider *pp) 406 { 407 struct g_consumer *cp; 408 int error; 409 410 g_topology_assert_not(); 411 KASSERT(disk->d_consumer == NULL, 412 ("Disk already connected (device %s).", disk->d_softc->sc_name)); 413 414 g_topology_lock(); 415 cp = g_new_consumer(disk->d_softc->sc_geom); 416 cp->flags |= G_CF_DIRECT_RECEIVE; 417 error = g_attach(cp, pp); 418 if (error != 0) { 419 g_destroy_consumer(cp); 420 g_topology_unlock(); 421 return (error); 422 } 423 error = g_access(cp, 1, 1, 1); 424 if (error != 0) { 425 g_detach(cp); 426 g_destroy_consumer(cp); 427 g_topology_unlock(); 428 G_MIRROR_DEBUG(0, "Cannot open consumer %s (error=%d).", 429 pp->name, error); 430 return (error); 431 } 432 g_topology_unlock(); 433 disk->d_consumer = cp; 434 disk->d_consumer->private = disk; 435 disk->d_consumer->index = 0; 436 437 G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk)); 438 return (0); 439 } 440 441 static void 442 g_mirror_disconnect_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 443 { 444 445 g_topology_assert(); 446 447 if (cp == NULL) 448 return; 449 if (cp->provider != NULL) 450 g_mirror_kill_consumer(sc, cp); 451 else 452 g_destroy_consumer(cp); 453 } 454 455 /* 456 * Initialize disk. This means allocate memory, create consumer, attach it 457 * to the provider and open access (r1w1e1) to it. 458 */ 459 static struct g_mirror_disk * 460 g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp, 461 struct g_mirror_metadata *md, int *errorp) 462 { 463 struct g_mirror_disk *disk; 464 int i, error; 465 466 disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO); 467 if (disk == NULL) { 468 error = ENOMEM; 469 goto fail; 470 } 471 disk->d_softc = sc; 472 error = g_mirror_connect_disk(disk, pp); 473 if (error != 0) 474 goto fail; 475 disk->d_id = md->md_did; 476 disk->d_state = G_MIRROR_DISK_STATE_NONE; 477 disk->d_priority = md->md_priority; 478 disk->d_flags = md->md_dflags; 479 error = g_getattr("GEOM::candelete", disk->d_consumer, &i); 480 if (error == 0 && i != 0) 481 disk->d_flags |= G_MIRROR_DISK_FLAG_CANDELETE; 482 if (md->md_provider[0] != '\0') 483 disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED; 484 disk->d_sync.ds_consumer = NULL; 485 disk->d_sync.ds_offset = md->md_sync_offset; 486 disk->d_sync.ds_offset_done = md->md_sync_offset; 487 disk->d_sync.ds_update_ts = time_uptime; 488 disk->d_genid = md->md_genid; 489 disk->d_sync.ds_syncid = md->md_syncid; 490 disk->d_init_ndisks = md->md_all; 491 disk->d_init_slice = md->md_slice; 492 disk->d_init_balance = md->md_balance; 493 disk->d_init_mediasize = md->md_mediasize; 494 if (errorp != NULL) 495 *errorp = 0; 496 return (disk); 497 fail: 498 if (errorp != NULL) 499 *errorp = error; 500 if (disk != NULL) 501 free(disk, M_MIRROR); 502 return (NULL); 503 } 504 505 static void 506 g_mirror_destroy_disk(struct g_mirror_disk *disk) 507 { 508 struct g_mirror_softc *sc; 509 510 g_topology_assert_not(); 511 sc = disk->d_softc; 512 sx_assert(&sc->sc_lock, SX_XLOCKED); 513 514 g_topology_lock(); 515 LIST_REMOVE(disk, d_next); 516 g_topology_unlock(); 517 g_mirror_event_cancel(disk); 518 if (sc->sc_hint == disk) 519 sc->sc_hint = NULL; 520 switch (disk->d_state) { 521 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 522 g_mirror_sync_stop(disk, 1); 523 /* FALLTHROUGH */ 524 case G_MIRROR_DISK_STATE_NEW: 525 case G_MIRROR_DISK_STATE_STALE: 526 case G_MIRROR_DISK_STATE_ACTIVE: 527 g_topology_lock(); 528 g_mirror_disconnect_consumer(sc, disk->d_consumer); 529 g_topology_unlock(); 530 free(disk, M_MIRROR); 531 break; 532 default: 533 KASSERT(0 == 1, ("Wrong disk state (%s, %s).", 534 g_mirror_get_diskname(disk), 535 g_mirror_disk_state2str(disk->d_state))); 536 } 537 } 538 539 static void 540 g_mirror_free_device(struct g_mirror_softc *sc) 541 { 542 543 g_topology_assert(); 544 545 mtx_destroy(&sc->sc_queue_mtx); 546 mtx_destroy(&sc->sc_events_mtx); 547 mtx_destroy(&sc->sc_done_mtx); 548 sx_destroy(&sc->sc_lock); 549 free(sc, M_MIRROR); 550 } 551 552 static void 553 g_mirror_providergone(struct g_provider *pp) 554 { 555 struct g_mirror_softc *sc = pp->private; 556 557 if ((--sc->sc_refcnt) == 0) 558 g_mirror_free_device(sc); 559 } 560 561 static void 562 g_mirror_destroy_device(struct g_mirror_softc *sc) 563 { 564 struct g_mirror_disk *disk; 565 struct g_mirror_event *ep; 566 struct g_geom *gp; 567 struct g_consumer *cp, *tmpcp; 568 569 g_topology_assert_not(); 570 sx_assert(&sc->sc_lock, SX_XLOCKED); 571 572 gp = sc->sc_geom; 573 if (sc->sc_provider != NULL) 574 g_mirror_destroy_provider(sc); 575 for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL; 576 disk = LIST_FIRST(&sc->sc_disks)) { 577 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 578 g_mirror_update_metadata(disk); 579 g_mirror_destroy_disk(disk); 580 } 581 while ((ep = g_mirror_event_first(sc)) != NULL) { 582 g_mirror_event_remove(sc, ep); 583 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 584 g_mirror_event_free(ep); 585 else { 586 ep->e_error = ECANCELED; 587 ep->e_flags |= G_MIRROR_EVENT_DONE; 588 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep); 589 mtx_lock(&sc->sc_events_mtx); 590 wakeup(ep); 591 mtx_unlock(&sc->sc_events_mtx); 592 } 593 } 594 g_mirror_timeout_drain(sc); 595 596 g_topology_lock(); 597 LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) { 598 g_mirror_disconnect_consumer(sc, cp); 599 } 600 g_wither_geom(sc->sc_sync.ds_geom, ENXIO); 601 G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name); 602 g_wither_geom(gp, ENXIO); 603 sx_xunlock(&sc->sc_lock); 604 if ((--sc->sc_refcnt) == 0) 605 g_mirror_free_device(sc); 606 g_topology_unlock(); 607 } 608 609 static void 610 g_mirror_orphan(struct g_consumer *cp) 611 { 612 struct g_mirror_disk *disk; 613 614 g_topology_assert(); 615 616 disk = cp->private; 617 if (disk == NULL) 618 return; 619 disk->d_softc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 620 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 621 G_MIRROR_EVENT_DONTWAIT); 622 } 623 624 /* 625 * Function should return the next active disk on the list. 626 * It is possible that it will be the same disk as given. 627 * If there are no active disks on list, NULL is returned. 628 */ 629 static __inline struct g_mirror_disk * 630 g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 631 { 632 struct g_mirror_disk *dp; 633 634 for (dp = LIST_NEXT(disk, d_next); dp != disk; 635 dp = LIST_NEXT(dp, d_next)) { 636 if (dp == NULL) 637 dp = LIST_FIRST(&sc->sc_disks); 638 if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE) 639 break; 640 } 641 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 642 return (NULL); 643 return (dp); 644 } 645 646 static struct g_mirror_disk * 647 g_mirror_get_disk(struct g_mirror_softc *sc) 648 { 649 struct g_mirror_disk *disk; 650 651 if (sc->sc_hint == NULL) { 652 sc->sc_hint = LIST_FIRST(&sc->sc_disks); 653 if (sc->sc_hint == NULL) 654 return (NULL); 655 } 656 disk = sc->sc_hint; 657 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) { 658 disk = g_mirror_find_next(sc, disk); 659 if (disk == NULL) 660 return (NULL); 661 } 662 sc->sc_hint = g_mirror_find_next(sc, disk); 663 return (disk); 664 } 665 666 static int 667 g_mirror_write_metadata(struct g_mirror_disk *disk, 668 struct g_mirror_metadata *md) 669 { 670 struct g_mirror_softc *sc; 671 struct g_consumer *cp; 672 off_t offset, length; 673 u_char *sector; 674 int error = 0; 675 676 g_topology_assert_not(); 677 sc = disk->d_softc; 678 sx_assert(&sc->sc_lock, SX_LOCKED); 679 680 cp = disk->d_consumer; 681 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name)); 682 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name)); 683 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 684 ("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr, 685 cp->acw, cp->ace)); 686 length = cp->provider->sectorsize; 687 offset = cp->provider->mediasize - length; 688 sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO); 689 if (md != NULL && 690 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) { 691 /* 692 * Handle the case, when the size of parent provider reduced. 693 */ 694 if (offset < md->md_mediasize) 695 error = ENOSPC; 696 else 697 mirror_metadata_encode(md, sector); 698 } 699 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_metadata_write, error); 700 if (error == 0) 701 error = g_write_data(cp, offset, sector, length); 702 free(sector, M_MIRROR); 703 if (error != 0) { 704 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 705 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 706 G_MIRROR_DEBUG(0, "Cannot write metadata on %s " 707 "(device=%s, error=%d).", 708 g_mirror_get_diskname(disk), sc->sc_name, error); 709 } else { 710 G_MIRROR_DEBUG(1, "Cannot write metadata on %s " 711 "(device=%s, error=%d).", 712 g_mirror_get_diskname(disk), sc->sc_name, error); 713 } 714 if (g_mirror_disconnect_on_failure && 715 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) { 716 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 717 g_mirror_event_send(disk, 718 G_MIRROR_DISK_STATE_DISCONNECTED, 719 G_MIRROR_EVENT_DONTWAIT); 720 } 721 } 722 return (error); 723 } 724 725 static int 726 g_mirror_clear_metadata(struct g_mirror_disk *disk) 727 { 728 int error; 729 730 g_topology_assert_not(); 731 sx_assert(&disk->d_softc->sc_lock, SX_LOCKED); 732 733 if (disk->d_softc->sc_type != G_MIRROR_TYPE_AUTOMATIC) 734 return (0); 735 error = g_mirror_write_metadata(disk, NULL); 736 if (error == 0) { 737 G_MIRROR_DEBUG(2, "Metadata on %s cleared.", 738 g_mirror_get_diskname(disk)); 739 } else { 740 G_MIRROR_DEBUG(0, 741 "Cannot clear metadata on disk %s (error=%d).", 742 g_mirror_get_diskname(disk), error); 743 } 744 return (error); 745 } 746 747 void 748 g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk, 749 struct g_mirror_metadata *md) 750 { 751 752 bzero(md, sizeof(*md)); 753 strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic)); 754 md->md_version = G_MIRROR_VERSION; 755 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name)); 756 md->md_mid = sc->sc_id; 757 md->md_all = sc->sc_ndisks; 758 md->md_slice = sc->sc_slice; 759 md->md_balance = sc->sc_balance; 760 md->md_genid = sc->sc_genid; 761 md->md_mediasize = sc->sc_mediasize; 762 md->md_sectorsize = sc->sc_sectorsize; 763 md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK); 764 if (disk == NULL) { 765 md->md_did = arc4random(); 766 } else { 767 md->md_did = disk->d_id; 768 md->md_priority = disk->d_priority; 769 md->md_syncid = disk->d_sync.ds_syncid; 770 md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK); 771 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 772 md->md_sync_offset = disk->d_sync.ds_offset_done; 773 if ((disk->d_flags & G_MIRROR_DISK_FLAG_HARDCODED) != 0) { 774 strlcpy(md->md_provider, 775 disk->d_consumer->provider->name, 776 sizeof(md->md_provider)); 777 } 778 md->md_provsize = disk->d_consumer->provider->mediasize; 779 } 780 } 781 782 void 783 g_mirror_update_metadata(struct g_mirror_disk *disk) 784 { 785 struct g_mirror_softc *sc; 786 struct g_mirror_metadata md; 787 int error; 788 789 g_topology_assert_not(); 790 sc = disk->d_softc; 791 sx_assert(&sc->sc_lock, SX_LOCKED); 792 793 if (sc->sc_type != G_MIRROR_TYPE_AUTOMATIC) 794 return; 795 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) 796 g_mirror_fill_metadata(sc, disk, &md); 797 error = g_mirror_write_metadata(disk, &md); 798 if (error == 0) { 799 G_MIRROR_DEBUG(2, "Metadata on %s updated.", 800 g_mirror_get_diskname(disk)); 801 } else { 802 G_MIRROR_DEBUG(0, 803 "Cannot update metadata on disk %s (error=%d).", 804 g_mirror_get_diskname(disk), error); 805 } 806 } 807 808 static void 809 g_mirror_bump_syncid(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_syncid++; 820 G_MIRROR_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name, 821 sc->sc_syncid); 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_sync.ds_syncid = sc->sc_syncid; 826 g_mirror_update_metadata(disk); 827 } 828 } 829 } 830 831 static void 832 g_mirror_bump_genid(struct g_mirror_softc *sc) 833 { 834 struct g_mirror_disk *disk; 835 836 g_topology_assert_not(); 837 sx_assert(&sc->sc_lock, SX_XLOCKED); 838 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 839 ("%s called with no active disks (device=%s).", __func__, 840 sc->sc_name)); 841 842 sc->sc_genid++; 843 G_MIRROR_DEBUG(1, "Device %s: genid bumped to %u.", sc->sc_name, 844 sc->sc_genid); 845 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 846 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 847 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 848 disk->d_genid = sc->sc_genid; 849 g_mirror_update_metadata(disk); 850 } 851 } 852 } 853 854 static int 855 g_mirror_idle(struct g_mirror_softc *sc, int acw) 856 { 857 struct g_mirror_disk *disk; 858 int timeout; 859 860 g_topology_assert_not(); 861 sx_assert(&sc->sc_lock, SX_XLOCKED); 862 863 if (sc->sc_provider == NULL) 864 return (0); 865 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 866 return (0); 867 if (sc->sc_idle) 868 return (0); 869 if (sc->sc_writes > 0) 870 return (0); 871 if (acw > 0 || (acw == -1 && sc->sc_provider->acw > 0)) { 872 timeout = g_mirror_idletime - (time_uptime - sc->sc_last_write); 873 if (!g_mirror_shutdown && timeout > 0) 874 return (timeout); 875 } 876 sc->sc_idle = 1; 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 clean.", 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 return (0); 886 } 887 888 static void 889 g_mirror_unidle(struct g_mirror_softc *sc) 890 { 891 struct g_mirror_disk *disk; 892 893 g_topology_assert_not(); 894 sx_assert(&sc->sc_lock, SX_XLOCKED); 895 896 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 897 return; 898 sc->sc_idle = 0; 899 sc->sc_last_write = time_uptime; 900 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 901 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 902 continue; 903 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as dirty.", 904 g_mirror_get_diskname(disk), sc->sc_name); 905 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 906 g_mirror_update_metadata(disk); 907 } 908 } 909 910 static void 911 g_mirror_done(struct bio *bp) 912 { 913 struct g_mirror_softc *sc; 914 915 sc = bp->bio_from->geom->softc; 916 bp->bio_cflags = G_MIRROR_BIO_FLAG_REGULAR; 917 mtx_lock(&sc->sc_queue_mtx); 918 TAILQ_INSERT_TAIL(&sc->sc_queue, bp, bio_queue); 919 mtx_unlock(&sc->sc_queue_mtx); 920 wakeup(sc); 921 } 922 923 static void 924 g_mirror_regular_request_error(struct g_mirror_softc *sc, 925 struct g_mirror_disk *disk, struct bio *bp) 926 { 927 928 if ((bp->bio_cmd == BIO_FLUSH || bp->bio_cmd == BIO_SPEEDUP) && 929 bp->bio_error == EOPNOTSUPP) 930 return; 931 932 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 933 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 934 G_MIRROR_LOGREQ(0, bp, "Request failed (error=%d).", 935 bp->bio_error); 936 } else { 937 G_MIRROR_LOGREQ(1, bp, "Request failed (error=%d).", 938 bp->bio_error); 939 } 940 if (g_mirror_disconnect_on_failure && 941 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) { 942 if (bp->bio_error == ENXIO && 943 bp->bio_cmd == BIO_READ) 944 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 945 else if (bp->bio_error == ENXIO) 946 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID_NOW; 947 else 948 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 949 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 950 G_MIRROR_EVENT_DONTWAIT); 951 } 952 } 953 954 static void 955 g_mirror_regular_request(struct g_mirror_softc *sc, struct bio *bp) 956 { 957 struct g_mirror_disk *disk; 958 struct bio *pbp; 959 960 g_topology_assert_not(); 961 KASSERT(sc->sc_provider == bp->bio_parent->bio_to, 962 ("regular request %p with unexpected origin", bp)); 963 964 pbp = bp->bio_parent; 965 bp->bio_from->index--; 966 if (bp->bio_cmd == BIO_WRITE || bp->bio_cmd == BIO_DELETE) 967 sc->sc_writes--; 968 disk = bp->bio_from->private; 969 if (disk == NULL) { 970 g_topology_lock(); 971 g_mirror_kill_consumer(sc, bp->bio_from); 972 g_topology_unlock(); 973 } 974 975 switch (bp->bio_cmd) { 976 case BIO_READ: 977 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_read, 978 bp->bio_error); 979 break; 980 case BIO_WRITE: 981 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_write, 982 bp->bio_error); 983 break; 984 case BIO_DELETE: 985 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_delete, 986 bp->bio_error); 987 break; 988 case BIO_FLUSH: 989 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_flush, 990 bp->bio_error); 991 break; 992 case BIO_SPEEDUP: 993 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_speedup, 994 bp->bio_error); 995 break; 996 } 997 998 pbp->bio_inbed++; 999 KASSERT(pbp->bio_inbed <= pbp->bio_children, 1000 ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed, 1001 pbp->bio_children)); 1002 if (bp->bio_error == 0 && pbp->bio_error == 0) { 1003 G_MIRROR_LOGREQ(3, bp, "Request delivered."); 1004 g_destroy_bio(bp); 1005 if (pbp->bio_children == pbp->bio_inbed) { 1006 G_MIRROR_LOGREQ(3, pbp, "Request delivered."); 1007 pbp->bio_completed = pbp->bio_length; 1008 if (pbp->bio_cmd == BIO_WRITE || 1009 pbp->bio_cmd == BIO_DELETE) { 1010 TAILQ_REMOVE(&sc->sc_inflight, pbp, bio_queue); 1011 /* Release delayed sync requests if possible. */ 1012 g_mirror_sync_release(sc); 1013 } 1014 g_io_deliver(pbp, pbp->bio_error); 1015 } 1016 return; 1017 } else if (bp->bio_error != 0) { 1018 if (pbp->bio_error == 0) 1019 pbp->bio_error = bp->bio_error; 1020 if (disk != NULL) 1021 g_mirror_regular_request_error(sc, disk, bp); 1022 switch (pbp->bio_cmd) { 1023 case BIO_DELETE: 1024 case BIO_WRITE: 1025 case BIO_FLUSH: 1026 case BIO_SPEEDUP: 1027 pbp->bio_inbed--; 1028 pbp->bio_children--; 1029 break; 1030 } 1031 } 1032 g_destroy_bio(bp); 1033 1034 switch (pbp->bio_cmd) { 1035 case BIO_READ: 1036 if (pbp->bio_inbed < pbp->bio_children) 1037 break; 1038 1039 /* 1040 * If there is only one active disk we want to double-check that 1041 * it is, in fact, the disk that we already tried. This is 1042 * necessary because we might have just lost a race with a 1043 * removal of the tried disk (likely because of the same error) 1044 * and the only remaining disk is still viable for a retry. 1045 */ 1046 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 1 && 1047 disk != NULL && 1048 disk->d_state == G_MIRROR_DISK_STATE_ACTIVE) { 1049 g_io_deliver(pbp, pbp->bio_error); 1050 } else { 1051 pbp->bio_error = 0; 1052 mtx_lock(&sc->sc_queue_mtx); 1053 TAILQ_INSERT_TAIL(&sc->sc_queue, pbp, bio_queue); 1054 mtx_unlock(&sc->sc_queue_mtx); 1055 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 1056 wakeup(sc); 1057 } 1058 break; 1059 case BIO_DELETE: 1060 case BIO_WRITE: 1061 case BIO_FLUSH: 1062 case BIO_SPEEDUP: 1063 if (pbp->bio_children == 0) { 1064 /* 1065 * All requests failed. 1066 */ 1067 } else if (pbp->bio_inbed < pbp->bio_children) { 1068 /* Do nothing. */ 1069 break; 1070 } else if (pbp->bio_children == pbp->bio_inbed) { 1071 /* Some requests succeeded. */ 1072 pbp->bio_error = 0; 1073 pbp->bio_completed = pbp->bio_length; 1074 } 1075 if (pbp->bio_cmd == BIO_WRITE || pbp->bio_cmd == BIO_DELETE) { 1076 TAILQ_REMOVE(&sc->sc_inflight, pbp, bio_queue); 1077 /* Release delayed sync requests if possible. */ 1078 g_mirror_sync_release(sc); 1079 } 1080 g_io_deliver(pbp, pbp->bio_error); 1081 break; 1082 default: 1083 KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd)); 1084 break; 1085 } 1086 } 1087 1088 static void 1089 g_mirror_sync_done(struct bio *bp) 1090 { 1091 struct g_mirror_softc *sc; 1092 1093 G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered."); 1094 sc = bp->bio_from->geom->softc; 1095 bp->bio_cflags = G_MIRROR_BIO_FLAG_SYNC; 1096 mtx_lock(&sc->sc_queue_mtx); 1097 TAILQ_INSERT_TAIL(&sc->sc_queue, bp, bio_queue); 1098 mtx_unlock(&sc->sc_queue_mtx); 1099 wakeup(sc); 1100 } 1101 1102 static void 1103 g_mirror_candelete(struct bio *bp) 1104 { 1105 struct g_mirror_softc *sc; 1106 struct g_mirror_disk *disk; 1107 int val; 1108 1109 sc = bp->bio_to->private; 1110 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1111 if (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) 1112 break; 1113 } 1114 val = disk != NULL; 1115 g_handleattr(bp, "GEOM::candelete", &val, sizeof(val)); 1116 } 1117 1118 static void 1119 g_mirror_kernel_dump(struct bio *bp) 1120 { 1121 struct g_mirror_softc *sc; 1122 struct g_mirror_disk *disk; 1123 struct bio *cbp; 1124 struct g_kerneldump *gkd; 1125 1126 /* 1127 * We configure dumping to the first component, because this component 1128 * will be used for reading with 'prefer' balance algorithm. 1129 * If the component with the highest priority is currently disconnected 1130 * we will not be able to read the dump after the reboot if it will be 1131 * connected and synchronized later. Can we do something better? 1132 */ 1133 sc = bp->bio_to->private; 1134 disk = LIST_FIRST(&sc->sc_disks); 1135 1136 gkd = (struct g_kerneldump *)bp->bio_data; 1137 if (gkd->length > bp->bio_to->mediasize) 1138 gkd->length = bp->bio_to->mediasize; 1139 cbp = g_clone_bio(bp); 1140 if (cbp == NULL) { 1141 g_io_deliver(bp, ENOMEM); 1142 return; 1143 } 1144 cbp->bio_done = g_std_done; 1145 g_io_request(cbp, disk->d_consumer); 1146 G_MIRROR_DEBUG(1, "Kernel dump will go to %s.", 1147 g_mirror_get_diskname(disk)); 1148 } 1149 1150 static void 1151 g_mirror_start(struct bio *bp) 1152 { 1153 struct g_mirror_softc *sc; 1154 1155 sc = bp->bio_to->private; 1156 /* 1157 * If sc == NULL or there are no valid disks, provider's error 1158 * should be set and g_mirror_start() should not be called at all. 1159 */ 1160 KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1161 ("Provider's error should be set (error=%d)(mirror=%s).", 1162 bp->bio_to->error, bp->bio_to->name)); 1163 G_MIRROR_LOGREQ(3, bp, "Request received."); 1164 1165 switch (bp->bio_cmd) { 1166 case BIO_READ: 1167 case BIO_WRITE: 1168 case BIO_DELETE: 1169 case BIO_SPEEDUP: 1170 case BIO_FLUSH: 1171 break; 1172 case BIO_GETATTR: 1173 if (!strcmp(bp->bio_attribute, "GEOM::candelete")) { 1174 g_mirror_candelete(bp); 1175 return; 1176 } else if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) { 1177 g_mirror_kernel_dump(bp); 1178 return; 1179 } 1180 /* FALLTHROUGH */ 1181 default: 1182 g_io_deliver(bp, EOPNOTSUPP); 1183 return; 1184 } 1185 mtx_lock(&sc->sc_queue_mtx); 1186 if (bp->bio_to->error != 0) { 1187 mtx_unlock(&sc->sc_queue_mtx); 1188 g_io_deliver(bp, bp->bio_to->error); 1189 return; 1190 } 1191 TAILQ_INSERT_TAIL(&sc->sc_queue, bp, bio_queue); 1192 mtx_unlock(&sc->sc_queue_mtx); 1193 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 1194 wakeup(sc); 1195 } 1196 1197 /* 1198 * Return TRUE if the given request is colliding with a in-progress 1199 * synchronization request. 1200 */ 1201 static bool 1202 g_mirror_sync_collision(struct g_mirror_softc *sc, struct bio *bp) 1203 { 1204 struct g_mirror_disk *disk; 1205 struct bio *sbp; 1206 off_t rstart, rend, sstart, send; 1207 u_int i; 1208 1209 if (sc->sc_sync.ds_ndisks == 0) 1210 return (false); 1211 rstart = bp->bio_offset; 1212 rend = bp->bio_offset + bp->bio_length; 1213 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1214 if (disk->d_state != G_MIRROR_DISK_STATE_SYNCHRONIZING) 1215 continue; 1216 for (i = 0; i < g_mirror_syncreqs; i++) { 1217 sbp = disk->d_sync.ds_bios[i]; 1218 if (sbp == NULL) 1219 continue; 1220 sstart = sbp->bio_offset; 1221 send = sbp->bio_offset + sbp->bio_length; 1222 if (rend > sstart && rstart < send) 1223 return (true); 1224 } 1225 } 1226 return (false); 1227 } 1228 1229 /* 1230 * Return TRUE if the given sync request is colliding with a in-progress regular 1231 * request. 1232 */ 1233 static bool 1234 g_mirror_regular_collision(struct g_mirror_softc *sc, struct bio *sbp) 1235 { 1236 off_t rstart, rend, sstart, send; 1237 struct bio *bp; 1238 1239 if (sc->sc_sync.ds_ndisks == 0) 1240 return (false); 1241 sstart = sbp->bio_offset; 1242 send = sbp->bio_offset + sbp->bio_length; 1243 TAILQ_FOREACH(bp, &sc->sc_inflight, bio_queue) { 1244 rstart = bp->bio_offset; 1245 rend = bp->bio_offset + bp->bio_length; 1246 if (rend > sstart && rstart < send) 1247 return (true); 1248 } 1249 return (false); 1250 } 1251 1252 /* 1253 * Puts regular request onto delayed queue. 1254 */ 1255 static void 1256 g_mirror_regular_delay(struct g_mirror_softc *sc, struct bio *bp) 1257 { 1258 1259 G_MIRROR_LOGREQ(2, bp, "Delaying request."); 1260 TAILQ_INSERT_TAIL(&sc->sc_regular_delayed, bp, bio_queue); 1261 } 1262 1263 /* 1264 * Puts synchronization request onto delayed queue. 1265 */ 1266 static void 1267 g_mirror_sync_delay(struct g_mirror_softc *sc, struct bio *bp) 1268 { 1269 1270 G_MIRROR_LOGREQ(2, bp, "Delaying synchronization request."); 1271 TAILQ_INSERT_TAIL(&sc->sc_sync_delayed, bp, bio_queue); 1272 } 1273 1274 /* 1275 * Requeue delayed regular requests. 1276 */ 1277 static void 1278 g_mirror_regular_release(struct g_mirror_softc *sc) 1279 { 1280 struct bio *bp; 1281 1282 if ((bp = TAILQ_FIRST(&sc->sc_regular_delayed)) == NULL) 1283 return; 1284 if (g_mirror_sync_collision(sc, bp)) 1285 return; 1286 1287 G_MIRROR_DEBUG(2, "Requeuing regular requests after collision."); 1288 mtx_lock(&sc->sc_queue_mtx); 1289 TAILQ_CONCAT(&sc->sc_regular_delayed, &sc->sc_queue, bio_queue); 1290 TAILQ_SWAP(&sc->sc_regular_delayed, &sc->sc_queue, bio, bio_queue); 1291 mtx_unlock(&sc->sc_queue_mtx); 1292 } 1293 1294 /* 1295 * Releases delayed sync requests which don't collide anymore with regular 1296 * requests. 1297 */ 1298 static void 1299 g_mirror_sync_release(struct g_mirror_softc *sc) 1300 { 1301 struct bio *bp, *bp2; 1302 1303 TAILQ_FOREACH_SAFE(bp, &sc->sc_sync_delayed, bio_queue, bp2) { 1304 if (g_mirror_regular_collision(sc, bp)) 1305 continue; 1306 TAILQ_REMOVE(&sc->sc_sync_delayed, bp, bio_queue); 1307 G_MIRROR_LOGREQ(2, bp, 1308 "Releasing delayed synchronization request."); 1309 g_io_request(bp, bp->bio_from); 1310 } 1311 } 1312 1313 /* 1314 * Free a synchronization request and clear its slot in the array. 1315 */ 1316 static void 1317 g_mirror_sync_request_free(struct g_mirror_disk *disk, struct bio *bp) 1318 { 1319 int idx; 1320 1321 if (disk != NULL && disk->d_sync.ds_bios != NULL) { 1322 idx = (int)(uintptr_t)bp->bio_caller1; 1323 KASSERT(disk->d_sync.ds_bios[idx] == bp, 1324 ("unexpected sync BIO at %p:%d", disk, idx)); 1325 disk->d_sync.ds_bios[idx] = NULL; 1326 } 1327 free(bp->bio_data, M_MIRROR); 1328 g_destroy_bio(bp); 1329 } 1330 1331 /* 1332 * Handle synchronization requests. 1333 * Every synchronization request is a two-step process: first, a read request is 1334 * sent to the mirror provider via the sync consumer. If that request completes 1335 * successfully, it is converted to a write and sent to the disk being 1336 * synchronized. If the write also completes successfully, the synchronization 1337 * offset is advanced and a new read request is submitted. 1338 */ 1339 static void 1340 g_mirror_sync_request(struct g_mirror_softc *sc, struct bio *bp) 1341 { 1342 struct g_mirror_disk *disk; 1343 struct g_mirror_disk_sync *sync; 1344 1345 KASSERT((bp->bio_cmd == BIO_READ && 1346 bp->bio_from->geom == sc->sc_sync.ds_geom) || 1347 (bp->bio_cmd == BIO_WRITE && bp->bio_from->geom == sc->sc_geom), 1348 ("Sync BIO %p with unexpected origin", bp)); 1349 1350 bp->bio_from->index--; 1351 disk = bp->bio_from->private; 1352 if (disk == NULL) { 1353 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 1354 g_topology_lock(); 1355 g_mirror_kill_consumer(sc, bp->bio_from); 1356 g_topology_unlock(); 1357 g_mirror_sync_request_free(NULL, bp); 1358 sx_xlock(&sc->sc_lock); 1359 return; 1360 } 1361 1362 sync = &disk->d_sync; 1363 1364 /* 1365 * Synchronization request. 1366 */ 1367 switch (bp->bio_cmd) { 1368 case BIO_READ: { 1369 struct g_consumer *cp; 1370 1371 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_sync_request_read, 1372 bp->bio_error); 1373 1374 if (bp->bio_error != 0) { 1375 G_MIRROR_LOGREQ(0, bp, 1376 "Synchronization request failed (error=%d).", 1377 bp->bio_error); 1378 1379 /* 1380 * The read error will trigger a syncid bump, so there's 1381 * no need to do that here. 1382 * 1383 * The read error handling for regular requests will 1384 * retry the read from all active mirrors before passing 1385 * the error back up, so there's no need to retry here. 1386 */ 1387 g_mirror_sync_request_free(disk, bp); 1388 g_mirror_event_send(disk, 1389 G_MIRROR_DISK_STATE_DISCONNECTED, 1390 G_MIRROR_EVENT_DONTWAIT); 1391 return; 1392 } 1393 G_MIRROR_LOGREQ(3, bp, 1394 "Synchronization request half-finished."); 1395 bp->bio_cmd = BIO_WRITE; 1396 bp->bio_cflags = 0; 1397 cp = disk->d_consumer; 1398 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1399 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1400 cp->acr, cp->acw, cp->ace)); 1401 cp->index++; 1402 g_io_request(bp, cp); 1403 return; 1404 } 1405 case BIO_WRITE: { 1406 off_t offset; 1407 int i; 1408 1409 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_sync_request_write, 1410 bp->bio_error); 1411 1412 if (bp->bio_error != 0) { 1413 G_MIRROR_LOGREQ(0, bp, 1414 "Synchronization request failed (error=%d).", 1415 bp->bio_error); 1416 g_mirror_sync_request_free(disk, bp); 1417 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 1418 g_mirror_event_send(disk, 1419 G_MIRROR_DISK_STATE_DISCONNECTED, 1420 G_MIRROR_EVENT_DONTWAIT); 1421 return; 1422 } 1423 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished."); 1424 if (sync->ds_offset >= sc->sc_mediasize || 1425 sync->ds_consumer == NULL || 1426 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1427 /* Don't send more synchronization requests. */ 1428 sync->ds_inflight--; 1429 g_mirror_sync_request_free(disk, bp); 1430 if (sync->ds_inflight > 0) 1431 return; 1432 if (sync->ds_consumer == NULL || 1433 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1434 return; 1435 } 1436 /* Disk up-to-date, activate it. */ 1437 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE, 1438 G_MIRROR_EVENT_DONTWAIT); 1439 return; 1440 } 1441 1442 /* Send next synchronization request. */ 1443 g_mirror_sync_reinit(disk, bp, sync->ds_offset); 1444 sync->ds_offset += bp->bio_length; 1445 1446 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 1447 sync->ds_consumer->index++; 1448 1449 /* 1450 * Delay the request if it is colliding with a regular request. 1451 */ 1452 if (g_mirror_regular_collision(sc, bp)) 1453 g_mirror_sync_delay(sc, bp); 1454 else 1455 g_io_request(bp, sync->ds_consumer); 1456 1457 /* Requeue delayed requests if possible. */ 1458 g_mirror_regular_release(sc); 1459 1460 /* Find the smallest offset */ 1461 offset = sc->sc_mediasize; 1462 for (i = 0; i < g_mirror_syncreqs; i++) { 1463 bp = sync->ds_bios[i]; 1464 if (bp != NULL && bp->bio_offset < offset) 1465 offset = bp->bio_offset; 1466 } 1467 if (g_mirror_sync_period > 0 && 1468 time_uptime - sync->ds_update_ts > g_mirror_sync_period) { 1469 sync->ds_offset_done = offset; 1470 g_mirror_update_metadata(disk); 1471 sync->ds_update_ts = time_uptime; 1472 } 1473 return; 1474 } 1475 default: 1476 panic("Invalid I/O request %p", bp); 1477 } 1478 } 1479 1480 static void 1481 g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp) 1482 { 1483 struct g_mirror_disk *disk; 1484 struct g_consumer *cp; 1485 struct bio *cbp; 1486 1487 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1488 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE) 1489 break; 1490 } 1491 if (disk == NULL) { 1492 if (bp->bio_error == 0) 1493 bp->bio_error = ENXIO; 1494 g_io_deliver(bp, bp->bio_error); 1495 return; 1496 } 1497 cbp = g_clone_bio(bp); 1498 if (cbp == NULL) { 1499 if (bp->bio_error == 0) 1500 bp->bio_error = ENOMEM; 1501 g_io_deliver(bp, bp->bio_error); 1502 return; 1503 } 1504 /* 1505 * Fill in the component buf structure. 1506 */ 1507 cp = disk->d_consumer; 1508 cbp->bio_done = g_mirror_done; 1509 cbp->bio_to = cp->provider; 1510 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1511 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1512 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1513 cp->acw, cp->ace)); 1514 cp->index++; 1515 g_io_request(cbp, cp); 1516 } 1517 1518 static void 1519 g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp) 1520 { 1521 struct g_mirror_disk *disk; 1522 struct g_consumer *cp; 1523 struct bio *cbp; 1524 1525 disk = g_mirror_get_disk(sc); 1526 if (disk == NULL) { 1527 if (bp->bio_error == 0) 1528 bp->bio_error = ENXIO; 1529 g_io_deliver(bp, bp->bio_error); 1530 return; 1531 } 1532 cbp = g_clone_bio(bp); 1533 if (cbp == NULL) { 1534 if (bp->bio_error == 0) 1535 bp->bio_error = ENOMEM; 1536 g_io_deliver(bp, bp->bio_error); 1537 return; 1538 } 1539 /* 1540 * Fill in the component buf structure. 1541 */ 1542 cp = disk->d_consumer; 1543 cbp->bio_done = g_mirror_done; 1544 cbp->bio_to = cp->provider; 1545 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1546 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1547 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1548 cp->acw, cp->ace)); 1549 cp->index++; 1550 g_io_request(cbp, cp); 1551 } 1552 1553 #define TRACK_SIZE (1 * 1024 * 1024) 1554 #define LOAD_SCALE 256 1555 #define ABS(x) (((x) >= 0) ? (x) : (-(x))) 1556 1557 static void 1558 g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp) 1559 { 1560 struct g_mirror_disk *disk, *dp; 1561 struct g_consumer *cp; 1562 struct bio *cbp; 1563 int prio, best; 1564 1565 /* Find a disk with the smallest load. */ 1566 disk = NULL; 1567 best = INT_MAX; 1568 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1569 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1570 continue; 1571 prio = dp->load; 1572 /* If disk head is precisely in position - highly prefer it. */ 1573 if (dp->d_last_offset == bp->bio_offset) 1574 prio -= 2 * LOAD_SCALE; 1575 else 1576 /* If disk head is close to position - prefer it. */ 1577 if (ABS(dp->d_last_offset - bp->bio_offset) < TRACK_SIZE) 1578 prio -= 1 * LOAD_SCALE; 1579 if (prio <= best) { 1580 disk = dp; 1581 best = prio; 1582 } 1583 } 1584 KASSERT(disk != NULL, ("NULL disk for %s.", sc->sc_name)); 1585 cbp = g_clone_bio(bp); 1586 if (cbp == NULL) { 1587 if (bp->bio_error == 0) 1588 bp->bio_error = ENOMEM; 1589 g_io_deliver(bp, bp->bio_error); 1590 return; 1591 } 1592 /* 1593 * Fill in the component buf structure. 1594 */ 1595 cp = disk->d_consumer; 1596 cbp->bio_done = g_mirror_done; 1597 cbp->bio_to = cp->provider; 1598 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1599 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1600 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1601 cp->acw, cp->ace)); 1602 cp->index++; 1603 /* Remember last head position */ 1604 disk->d_last_offset = bp->bio_offset + bp->bio_length; 1605 /* Update loads. */ 1606 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1607 dp->load = (dp->d_consumer->index * LOAD_SCALE + 1608 dp->load * 7) / 8; 1609 } 1610 g_io_request(cbp, cp); 1611 } 1612 1613 static void 1614 g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp) 1615 { 1616 struct bio_queue queue; 1617 struct g_mirror_disk *disk; 1618 struct g_consumer *cp __diagused; 1619 struct bio *cbp; 1620 off_t left, mod, offset, slice; 1621 u_char *data; 1622 u_int ndisks; 1623 1624 if (bp->bio_length <= sc->sc_slice) { 1625 g_mirror_request_round_robin(sc, bp); 1626 return; 1627 } 1628 ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE); 1629 slice = bp->bio_length / ndisks; 1630 mod = slice % sc->sc_provider->sectorsize; 1631 if (mod != 0) 1632 slice += sc->sc_provider->sectorsize - mod; 1633 /* 1634 * Allocate all bios before sending any request, so we can 1635 * return ENOMEM in nice and clean way. 1636 */ 1637 left = bp->bio_length; 1638 offset = bp->bio_offset; 1639 data = bp->bio_data; 1640 TAILQ_INIT(&queue); 1641 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1642 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1643 continue; 1644 cbp = g_clone_bio(bp); 1645 if (cbp == NULL) { 1646 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1647 TAILQ_REMOVE(&queue, cbp, bio_queue); 1648 g_destroy_bio(cbp); 1649 } 1650 if (bp->bio_error == 0) 1651 bp->bio_error = ENOMEM; 1652 g_io_deliver(bp, bp->bio_error); 1653 return; 1654 } 1655 TAILQ_INSERT_TAIL(&queue, cbp, bio_queue); 1656 cbp->bio_done = g_mirror_done; 1657 cbp->bio_caller1 = disk; 1658 cbp->bio_to = disk->d_consumer->provider; 1659 cbp->bio_offset = offset; 1660 cbp->bio_data = data; 1661 cbp->bio_length = MIN(left, slice); 1662 left -= cbp->bio_length; 1663 if (left == 0) 1664 break; 1665 offset += cbp->bio_length; 1666 data += cbp->bio_length; 1667 } 1668 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1669 TAILQ_REMOVE(&queue, cbp, bio_queue); 1670 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1671 disk = cbp->bio_caller1; 1672 cbp->bio_caller1 = NULL; 1673 cp = disk->d_consumer; 1674 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1675 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1676 cp->acr, cp->acw, cp->ace)); 1677 disk->d_consumer->index++; 1678 g_io_request(cbp, disk->d_consumer); 1679 } 1680 } 1681 1682 static void 1683 g_mirror_register_request(struct g_mirror_softc *sc, struct bio *bp) 1684 { 1685 struct bio_queue queue; 1686 struct bio *cbp; 1687 struct g_consumer *cp; 1688 struct g_mirror_disk *disk; 1689 1690 sx_assert(&sc->sc_lock, SA_XLOCKED); 1691 1692 /* 1693 * To avoid ordering issues, if a write is deferred because of a 1694 * collision with a sync request, all I/O is deferred until that 1695 * write is initiated. 1696 */ 1697 if (bp->bio_from->geom != sc->sc_sync.ds_geom && 1698 !TAILQ_EMPTY(&sc->sc_regular_delayed)) { 1699 g_mirror_regular_delay(sc, bp); 1700 return; 1701 } 1702 1703 switch (bp->bio_cmd) { 1704 case BIO_READ: 1705 switch (sc->sc_balance) { 1706 case G_MIRROR_BALANCE_LOAD: 1707 g_mirror_request_load(sc, bp); 1708 break; 1709 case G_MIRROR_BALANCE_PREFER: 1710 g_mirror_request_prefer(sc, bp); 1711 break; 1712 case G_MIRROR_BALANCE_ROUND_ROBIN: 1713 g_mirror_request_round_robin(sc, bp); 1714 break; 1715 case G_MIRROR_BALANCE_SPLIT: 1716 g_mirror_request_split(sc, bp); 1717 break; 1718 } 1719 return; 1720 case BIO_WRITE: 1721 case BIO_DELETE: 1722 /* 1723 * Delay the request if it is colliding with a synchronization 1724 * request. 1725 */ 1726 if (g_mirror_sync_collision(sc, bp)) { 1727 g_mirror_regular_delay(sc, bp); 1728 return; 1729 } 1730 1731 if (sc->sc_idle) 1732 g_mirror_unidle(sc); 1733 else 1734 sc->sc_last_write = time_uptime; 1735 1736 /* 1737 * Bump syncid on first write. 1738 */ 1739 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) { 1740 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 1741 g_mirror_bump_syncid(sc); 1742 } 1743 1744 /* 1745 * Allocate all bios before sending any request, so we can 1746 * return ENOMEM in nice and clean way. 1747 */ 1748 TAILQ_INIT(&queue); 1749 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1750 switch (disk->d_state) { 1751 case G_MIRROR_DISK_STATE_ACTIVE: 1752 break; 1753 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 1754 if (bp->bio_offset >= disk->d_sync.ds_offset) 1755 continue; 1756 break; 1757 default: 1758 continue; 1759 } 1760 if (bp->bio_cmd == BIO_DELETE && 1761 (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) == 0) 1762 continue; 1763 cbp = g_clone_bio(bp); 1764 if (cbp == NULL) { 1765 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1766 TAILQ_REMOVE(&queue, cbp, bio_queue); 1767 g_destroy_bio(cbp); 1768 } 1769 if (bp->bio_error == 0) 1770 bp->bio_error = ENOMEM; 1771 g_io_deliver(bp, bp->bio_error); 1772 return; 1773 } 1774 TAILQ_INSERT_TAIL(&queue, cbp, bio_queue); 1775 cbp->bio_done = g_mirror_done; 1776 cp = disk->d_consumer; 1777 cbp->bio_caller1 = cp; 1778 cbp->bio_to = cp->provider; 1779 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1780 ("Consumer %s not opened (r%dw%de%d).", 1781 cp->provider->name, cp->acr, cp->acw, cp->ace)); 1782 } 1783 if (TAILQ_EMPTY(&queue)) { 1784 KASSERT(bp->bio_cmd == BIO_DELETE, 1785 ("No consumers for regular request %p", bp)); 1786 g_io_deliver(bp, EOPNOTSUPP); 1787 return; 1788 } 1789 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1790 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1791 TAILQ_REMOVE(&queue, cbp, bio_queue); 1792 cp = cbp->bio_caller1; 1793 cbp->bio_caller1 = NULL; 1794 cp->index++; 1795 sc->sc_writes++; 1796 g_io_request(cbp, cp); 1797 } 1798 /* 1799 * Put request onto inflight queue, so we can check if new 1800 * synchronization requests don't collide with it. 1801 */ 1802 TAILQ_INSERT_TAIL(&sc->sc_inflight, bp, bio_queue); 1803 return; 1804 case BIO_SPEEDUP: 1805 case BIO_FLUSH: 1806 TAILQ_INIT(&queue); 1807 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1808 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1809 continue; 1810 cbp = g_clone_bio(bp); 1811 if (cbp == NULL) { 1812 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1813 TAILQ_REMOVE(&queue, cbp, bio_queue); 1814 g_destroy_bio(cbp); 1815 } 1816 if (bp->bio_error == 0) 1817 bp->bio_error = ENOMEM; 1818 g_io_deliver(bp, bp->bio_error); 1819 return; 1820 } 1821 TAILQ_INSERT_TAIL(&queue, cbp, bio_queue); 1822 cbp->bio_done = g_mirror_done; 1823 cbp->bio_caller1 = disk; 1824 cbp->bio_to = disk->d_consumer->provider; 1825 } 1826 KASSERT(!TAILQ_EMPTY(&queue), 1827 ("No consumers for regular request %p", bp)); 1828 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1829 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1830 TAILQ_REMOVE(&queue, cbp, bio_queue); 1831 disk = cbp->bio_caller1; 1832 cbp->bio_caller1 = NULL; 1833 cp = disk->d_consumer; 1834 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1835 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1836 cp->acr, cp->acw, cp->ace)); 1837 cp->index++; 1838 g_io_request(cbp, cp); 1839 } 1840 break; 1841 default: 1842 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1843 bp->bio_cmd, sc->sc_name)); 1844 break; 1845 } 1846 } 1847 1848 static int 1849 g_mirror_can_destroy(struct g_mirror_softc *sc) 1850 { 1851 struct g_geom *gp; 1852 struct g_consumer *cp; 1853 1854 g_topology_assert(); 1855 gp = sc->sc_geom; 1856 if (gp->softc == NULL) 1857 return (1); 1858 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_TASTING) != 0) 1859 return (0); 1860 LIST_FOREACH(cp, &gp->consumer, consumer) { 1861 if (g_mirror_is_busy(sc, cp)) 1862 return (0); 1863 } 1864 gp = sc->sc_sync.ds_geom; 1865 LIST_FOREACH(cp, &gp->consumer, consumer) { 1866 if (g_mirror_is_busy(sc, cp)) 1867 return (0); 1868 } 1869 G_MIRROR_DEBUG(2, "No I/O requests for %s, it can be destroyed.", 1870 sc->sc_name); 1871 return (1); 1872 } 1873 1874 static int 1875 g_mirror_try_destroy(struct g_mirror_softc *sc) 1876 { 1877 1878 if (sc->sc_rootmount != NULL) { 1879 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 1880 sc->sc_rootmount); 1881 root_mount_rel(sc->sc_rootmount); 1882 sc->sc_rootmount = NULL; 1883 } 1884 g_topology_lock(); 1885 if (!g_mirror_can_destroy(sc)) { 1886 g_topology_unlock(); 1887 return (0); 1888 } 1889 sc->sc_geom->softc = NULL; 1890 sc->sc_sync.ds_geom->softc = NULL; 1891 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DRAIN) != 0) { 1892 g_topology_unlock(); 1893 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1894 &sc->sc_worker); 1895 /* Unlock sc_lock here, as it can be destroyed after wakeup. */ 1896 sx_xunlock(&sc->sc_lock); 1897 wakeup(&sc->sc_worker); 1898 sc->sc_worker = NULL; 1899 } else { 1900 g_topology_unlock(); 1901 g_mirror_destroy_device(sc); 1902 } 1903 return (1); 1904 } 1905 1906 /* 1907 * Worker thread. 1908 */ 1909 static void 1910 g_mirror_worker(void *arg) 1911 { 1912 struct g_mirror_softc *sc; 1913 struct g_mirror_event *ep; 1914 struct bio *bp; 1915 int timeout; 1916 1917 sc = arg; 1918 thread_lock(curthread); 1919 sched_prio(curthread, PRIBIO); 1920 thread_unlock(curthread); 1921 1922 sx_xlock(&sc->sc_lock); 1923 for (;;) { 1924 G_MIRROR_DEBUG(5, "%s: Let's see...", __func__); 1925 /* 1926 * First take a look at events. 1927 * This is important to handle events before any I/O requests. 1928 */ 1929 ep = g_mirror_event_first(sc); 1930 if (ep != NULL) { 1931 g_mirror_event_remove(sc, ep); 1932 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) { 1933 /* Update only device status. */ 1934 G_MIRROR_DEBUG(3, 1935 "Running event for device %s.", 1936 sc->sc_name); 1937 ep->e_error = 0; 1938 g_mirror_update_device(sc, true); 1939 } else { 1940 /* Update disk status. */ 1941 G_MIRROR_DEBUG(3, "Running event for disk %s.", 1942 g_mirror_get_diskname(ep->e_disk)); 1943 ep->e_error = g_mirror_update_disk(ep->e_disk, 1944 ep->e_state); 1945 if (ep->e_error == 0) 1946 g_mirror_update_device(sc, false); 1947 } 1948 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) { 1949 KASSERT(ep->e_error == 0, 1950 ("Error cannot be handled.")); 1951 g_mirror_event_free(ep); 1952 } else { 1953 ep->e_flags |= G_MIRROR_EVENT_DONE; 1954 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1955 ep); 1956 mtx_lock(&sc->sc_events_mtx); 1957 wakeup(ep); 1958 mtx_unlock(&sc->sc_events_mtx); 1959 } 1960 if ((sc->sc_flags & 1961 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1962 if (g_mirror_try_destroy(sc)) { 1963 curthread->td_pflags &= ~TDP_GEOM; 1964 G_MIRROR_DEBUG(1, "Thread exiting."); 1965 kproc_exit(0); 1966 } 1967 } 1968 G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__); 1969 continue; 1970 } 1971 1972 /* 1973 * Check if we can mark array as CLEAN and if we can't take 1974 * how much seconds should we wait. 1975 */ 1976 timeout = g_mirror_idle(sc, -1); 1977 1978 /* 1979 * Handle I/O requests. 1980 */ 1981 mtx_lock(&sc->sc_queue_mtx); 1982 bp = TAILQ_FIRST(&sc->sc_queue); 1983 if (bp != NULL) 1984 TAILQ_REMOVE(&sc->sc_queue, bp, bio_queue); 1985 else { 1986 if ((sc->sc_flags & 1987 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1988 mtx_unlock(&sc->sc_queue_mtx); 1989 if (g_mirror_try_destroy(sc)) { 1990 curthread->td_pflags &= ~TDP_GEOM; 1991 G_MIRROR_DEBUG(1, "Thread exiting."); 1992 kproc_exit(0); 1993 } 1994 mtx_lock(&sc->sc_queue_mtx); 1995 if (!TAILQ_EMPTY(&sc->sc_queue)) { 1996 mtx_unlock(&sc->sc_queue_mtx); 1997 continue; 1998 } 1999 } 2000 if (g_mirror_event_first(sc) != NULL) { 2001 mtx_unlock(&sc->sc_queue_mtx); 2002 continue; 2003 } 2004 sx_xunlock(&sc->sc_lock); 2005 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w1", 2006 timeout * hz); 2007 sx_xlock(&sc->sc_lock); 2008 G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__); 2009 continue; 2010 } 2011 mtx_unlock(&sc->sc_queue_mtx); 2012 2013 if (bp->bio_from->geom == sc->sc_sync.ds_geom && 2014 (bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) { 2015 /* 2016 * Handle completion of the first half (the read) of a 2017 * block synchronization operation. 2018 */ 2019 g_mirror_sync_request(sc, bp); 2020 } else if (bp->bio_to != sc->sc_provider) { 2021 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0) 2022 /* 2023 * Handle completion of a regular I/O request. 2024 */ 2025 g_mirror_regular_request(sc, bp); 2026 else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 2027 /* 2028 * Handle completion of the second half (the 2029 * write) of a block synchronization operation. 2030 */ 2031 g_mirror_sync_request(sc, bp); 2032 else { 2033 KASSERT(0, 2034 ("Invalid request cflags=0x%hx to=%s.", 2035 bp->bio_cflags, bp->bio_to->name)); 2036 } 2037 } else { 2038 /* 2039 * Initiate an I/O request. 2040 */ 2041 g_mirror_register_request(sc, bp); 2042 } 2043 G_MIRROR_DEBUG(5, "%s: I'm here 9.", __func__); 2044 } 2045 } 2046 2047 static void 2048 g_mirror_update_idle(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 2049 { 2050 2051 sx_assert(&sc->sc_lock, SX_LOCKED); 2052 2053 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 2054 return; 2055 if (!sc->sc_idle && (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) { 2056 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as dirty.", 2057 g_mirror_get_diskname(disk), sc->sc_name); 2058 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 2059 } else if (sc->sc_idle && 2060 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 2061 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as clean.", 2062 g_mirror_get_diskname(disk), sc->sc_name); 2063 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2064 } 2065 } 2066 2067 static void 2068 g_mirror_sync_reinit(const struct g_mirror_disk *disk, struct bio *bp, 2069 off_t offset) 2070 { 2071 void *data; 2072 int idx; 2073 2074 data = bp->bio_data; 2075 idx = (int)(uintptr_t)bp->bio_caller1; 2076 g_reset_bio(bp); 2077 2078 bp->bio_cmd = BIO_READ; 2079 bp->bio_data = data; 2080 bp->bio_done = g_mirror_sync_done; 2081 bp->bio_from = disk->d_sync.ds_consumer; 2082 bp->bio_to = disk->d_softc->sc_provider; 2083 bp->bio_caller1 = (void *)(uintptr_t)idx; 2084 bp->bio_offset = offset; 2085 bp->bio_length = MIN(maxphys, 2086 disk->d_softc->sc_mediasize - bp->bio_offset); 2087 } 2088 2089 static void 2090 g_mirror_sync_start(struct g_mirror_disk *disk) 2091 { 2092 struct g_mirror_softc *sc; 2093 struct g_mirror_disk_sync *sync; 2094 struct g_consumer *cp; 2095 struct bio *bp; 2096 int error __diagused, i; 2097 2098 g_topology_assert_not(); 2099 sc = disk->d_softc; 2100 sync = &disk->d_sync; 2101 sx_assert(&sc->sc_lock, SX_LOCKED); 2102 2103 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2104 ("Disk %s is not marked for synchronization.", 2105 g_mirror_get_diskname(disk))); 2106 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2107 ("Device not in RUNNING state (%s, %u).", sc->sc_name, 2108 sc->sc_state)); 2109 2110 sx_xunlock(&sc->sc_lock); 2111 g_topology_lock(); 2112 cp = g_new_consumer(sc->sc_sync.ds_geom); 2113 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 2114 error = g_attach(cp, sc->sc_provider); 2115 KASSERT(error == 0, 2116 ("Cannot attach to %s (error=%d).", sc->sc_name, error)); 2117 error = g_access(cp, 1, 0, 0); 2118 KASSERT(error == 0, ("Cannot open %s (error=%d).", sc->sc_name, error)); 2119 g_topology_unlock(); 2120 sx_xlock(&sc->sc_lock); 2121 2122 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name, 2123 g_mirror_get_diskname(disk)); 2124 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) == 0) 2125 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 2126 KASSERT(sync->ds_consumer == NULL, 2127 ("Sync consumer already exists (device=%s, disk=%s).", 2128 sc->sc_name, g_mirror_get_diskname(disk))); 2129 2130 sync->ds_consumer = cp; 2131 sync->ds_consumer->private = disk; 2132 sync->ds_consumer->index = 0; 2133 2134 /* 2135 * Allocate memory for synchronization bios and initialize them. 2136 */ 2137 sync->ds_bios = malloc(sizeof(struct bio *) * g_mirror_syncreqs, 2138 M_MIRROR, M_WAITOK); 2139 for (i = 0; i < g_mirror_syncreqs; i++) { 2140 bp = g_alloc_bio(); 2141 sync->ds_bios[i] = bp; 2142 2143 bp->bio_data = malloc(maxphys, M_MIRROR, M_WAITOK); 2144 bp->bio_caller1 = (void *)(uintptr_t)i; 2145 g_mirror_sync_reinit(disk, bp, sync->ds_offset); 2146 sync->ds_offset += bp->bio_length; 2147 } 2148 2149 /* Increase the number of disks in SYNCHRONIZING state. */ 2150 sc->sc_sync.ds_ndisks++; 2151 /* Set the number of in-flight synchronization requests. */ 2152 sync->ds_inflight = g_mirror_syncreqs; 2153 2154 /* 2155 * Fire off first synchronization requests. 2156 */ 2157 for (i = 0; i < g_mirror_syncreqs; i++) { 2158 bp = sync->ds_bios[i]; 2159 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 2160 sync->ds_consumer->index++; 2161 /* 2162 * Delay the request if it is colliding with a regular request. 2163 */ 2164 if (g_mirror_regular_collision(sc, bp)) 2165 g_mirror_sync_delay(sc, bp); 2166 else 2167 g_io_request(bp, sync->ds_consumer); 2168 } 2169 } 2170 2171 /* 2172 * Stop synchronization process. 2173 * type: 0 - synchronization finished 2174 * 1 - synchronization stopped 2175 */ 2176 static void 2177 g_mirror_sync_stop(struct g_mirror_disk *disk, int type) 2178 { 2179 struct g_mirror_softc *sc; 2180 struct g_consumer *cp; 2181 2182 g_topology_assert_not(); 2183 sc = disk->d_softc; 2184 sx_assert(&sc->sc_lock, SX_LOCKED); 2185 2186 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2187 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2188 g_mirror_disk_state2str(disk->d_state))); 2189 if (disk->d_sync.ds_consumer == NULL) 2190 return; 2191 2192 if (type == 0) { 2193 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.", 2194 sc->sc_name, g_mirror_get_diskname(disk)); 2195 } else /* if (type == 1) */ { 2196 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.", 2197 sc->sc_name, g_mirror_get_diskname(disk)); 2198 } 2199 g_mirror_regular_release(sc); 2200 free(disk->d_sync.ds_bios, M_MIRROR); 2201 disk->d_sync.ds_bios = NULL; 2202 cp = disk->d_sync.ds_consumer; 2203 disk->d_sync.ds_consumer = NULL; 2204 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2205 sc->sc_sync.ds_ndisks--; 2206 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 2207 g_topology_lock(); 2208 g_mirror_kill_consumer(sc, cp); 2209 g_topology_unlock(); 2210 sx_xlock(&sc->sc_lock); 2211 } 2212 2213 static void 2214 g_mirror_launch_provider(struct g_mirror_softc *sc) 2215 { 2216 struct g_mirror_disk *disk; 2217 struct g_provider *pp, *dp; 2218 2219 sx_assert(&sc->sc_lock, SX_LOCKED); 2220 2221 g_topology_lock(); 2222 pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name); 2223 pp->flags |= G_PF_DIRECT_RECEIVE; 2224 pp->mediasize = sc->sc_mediasize; 2225 pp->sectorsize = sc->sc_sectorsize; 2226 pp->stripesize = 0; 2227 pp->stripeoffset = 0; 2228 2229 /* Splitting of unmapped BIO's could work but isn't implemented now */ 2230 if (sc->sc_balance != G_MIRROR_BALANCE_SPLIT) 2231 pp->flags |= G_PF_ACCEPT_UNMAPPED; 2232 2233 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2234 if (disk->d_consumer && disk->d_consumer->provider) { 2235 dp = disk->d_consumer->provider; 2236 if (dp->stripesize > pp->stripesize) { 2237 pp->stripesize = dp->stripesize; 2238 pp->stripeoffset = dp->stripeoffset; 2239 } 2240 /* A provider underneath us doesn't support unmapped */ 2241 if ((dp->flags & G_PF_ACCEPT_UNMAPPED) == 0) { 2242 G_MIRROR_DEBUG(0, "Cancelling unmapped " 2243 "because of %s.", dp->name); 2244 pp->flags &= ~G_PF_ACCEPT_UNMAPPED; 2245 } 2246 } 2247 } 2248 pp->private = sc; 2249 sc->sc_refcnt++; 2250 sc->sc_provider = pp; 2251 g_error_provider(pp, 0); 2252 g_topology_unlock(); 2253 G_MIRROR_DEBUG(0, "Device %s launched (%u/%u).", pp->name, 2254 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE), sc->sc_ndisks); 2255 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2256 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2257 g_mirror_sync_start(disk); 2258 } 2259 } 2260 2261 static void 2262 g_mirror_destroy_provider(struct g_mirror_softc *sc) 2263 { 2264 struct g_mirror_disk *disk; 2265 struct bio *bp; 2266 2267 g_topology_assert_not(); 2268 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).", 2269 sc->sc_name)); 2270 2271 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2272 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2273 g_mirror_sync_stop(disk, 1); 2274 } 2275 2276 g_topology_lock(); 2277 g_error_provider(sc->sc_provider, ENXIO); 2278 mtx_lock(&sc->sc_queue_mtx); 2279 while ((bp = TAILQ_FIRST(&sc->sc_queue)) != NULL) { 2280 TAILQ_REMOVE(&sc->sc_queue, bp, bio_queue); 2281 /* 2282 * Abort any pending I/O that wasn't generated by us. 2283 * Synchronization requests and requests destined for individual 2284 * mirror components can be destroyed immediately. 2285 */ 2286 if (bp->bio_to == sc->sc_provider && 2287 bp->bio_from->geom != sc->sc_sync.ds_geom) { 2288 g_io_deliver(bp, ENXIO); 2289 } else { 2290 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 2291 free(bp->bio_data, M_MIRROR); 2292 g_destroy_bio(bp); 2293 } 2294 } 2295 mtx_unlock(&sc->sc_queue_mtx); 2296 g_wither_provider(sc->sc_provider, ENXIO); 2297 sc->sc_provider = NULL; 2298 G_MIRROR_DEBUG(0, "Device %s: provider destroyed.", sc->sc_name); 2299 g_topology_unlock(); 2300 } 2301 2302 static void 2303 g_mirror_go(void *arg) 2304 { 2305 struct g_mirror_softc *sc; 2306 struct g_mirror_event *ep; 2307 2308 sc = arg; 2309 G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name); 2310 ep = sc->sc_timeout_event; 2311 sc->sc_timeout_event = NULL; 2312 g_mirror_event_dispatch(ep, sc, 0, 2313 G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE); 2314 } 2315 2316 static void 2317 g_mirror_timeout_drain(struct g_mirror_softc *sc) 2318 { 2319 sx_assert(&sc->sc_lock, SX_XLOCKED); 2320 2321 callout_drain(&sc->sc_callout); 2322 g_mirror_event_free(sc->sc_timeout_event); 2323 sc->sc_timeout_event = NULL; 2324 } 2325 2326 static u_int 2327 g_mirror_determine_state(struct g_mirror_disk *disk) 2328 { 2329 struct g_mirror_softc *sc; 2330 u_int state; 2331 2332 sc = disk->d_softc; 2333 if (sc->sc_syncid == disk->d_sync.ds_syncid) { 2334 if ((disk->d_flags & 2335 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0 && 2336 (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 || 2337 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0)) { 2338 /* Disk does not need synchronization. */ 2339 state = G_MIRROR_DISK_STATE_ACTIVE; 2340 } else { 2341 if ((sc->sc_flags & 2342 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2343 (disk->d_flags & 2344 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2345 /* 2346 * We can start synchronization from 2347 * the stored offset. 2348 */ 2349 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2350 } else { 2351 state = G_MIRROR_DISK_STATE_STALE; 2352 } 2353 } 2354 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) { 2355 /* 2356 * Reset all synchronization data for this disk, 2357 * because if it even was synchronized, it was 2358 * synchronized to disks with different syncid. 2359 */ 2360 disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2361 disk->d_sync.ds_offset = 0; 2362 disk->d_sync.ds_offset_done = 0; 2363 disk->d_sync.ds_syncid = sc->sc_syncid; 2364 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2365 (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2366 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2367 } else { 2368 state = G_MIRROR_DISK_STATE_STALE; 2369 } 2370 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ { 2371 /* 2372 * Not good, NOT GOOD! 2373 * It means that mirror was started on stale disks 2374 * and more fresh disk just arrive. 2375 * If there were writes, mirror is broken, sorry. 2376 * I think the best choice here is don't touch 2377 * this disk and inform the user loudly. 2378 */ 2379 G_MIRROR_DEBUG(0, "Device %s was started before the freshest " 2380 "disk (%s) arrives!! It will not be connected to the " 2381 "running device.", sc->sc_name, 2382 g_mirror_get_diskname(disk)); 2383 g_mirror_destroy_disk(disk); 2384 state = G_MIRROR_DISK_STATE_NONE; 2385 /* Return immediately, because disk was destroyed. */ 2386 return (state); 2387 } 2388 G_MIRROR_DEBUG(3, "State for %s disk: %s.", 2389 g_mirror_get_diskname(disk), g_mirror_disk_state2str(state)); 2390 return (state); 2391 } 2392 2393 /* 2394 * Update device state. 2395 */ 2396 static void 2397 g_mirror_update_device(struct g_mirror_softc *sc, bool force) 2398 { 2399 struct g_mirror_disk *disk; 2400 u_int state; 2401 2402 sx_assert(&sc->sc_lock, SX_XLOCKED); 2403 2404 switch (sc->sc_state) { 2405 case G_MIRROR_DEVICE_STATE_STARTING: 2406 { 2407 struct g_mirror_disk *pdisk, *tdisk; 2408 const char *mismatch; 2409 uintmax_t found, newest; 2410 u_int dirty, ndisks; 2411 2412 /* Pre-flight checks */ 2413 LIST_FOREACH_SAFE(disk, &sc->sc_disks, d_next, tdisk) { 2414 /* 2415 * Confirm we already detected the newest genid. 2416 */ 2417 KASSERT(sc->sc_genid >= disk->d_genid, 2418 ("%s: found newer genid %u (sc:%p had %u).", __func__, 2419 disk->d_genid, sc, sc->sc_genid)); 2420 2421 /* Kick out any previously tasted stale components. */ 2422 if (disk->d_genid < sc->sc_genid) { 2423 G_MIRROR_DEBUG(0, "Stale 'genid' field on %s " 2424 "(device %s) (component=%u latest=%u), skipping.", 2425 g_mirror_get_diskname(disk), sc->sc_name, 2426 disk->d_genid, sc->sc_genid); 2427 g_mirror_destroy_disk(disk); 2428 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2429 continue; 2430 } 2431 2432 /* 2433 * Confirm we already detected the newest syncid. 2434 */ 2435 KASSERT(sc->sc_syncid >= disk->d_sync.ds_syncid, 2436 ("%s: found newer syncid %u (sc:%p had %u).", 2437 __func__, disk->d_sync.ds_syncid, sc, 2438 sc->sc_syncid)); 2439 2440 #define DETECT_MISMATCH(field, name) \ 2441 if (mismatch == NULL && \ 2442 disk->d_init_ ## field != sc->sc_ ## field) { \ 2443 mismatch = name; \ 2444 found = (intmax_t)disk->d_init_ ## field; \ 2445 newest = (intmax_t)sc->sc_ ## field; \ 2446 } 2447 mismatch = NULL; 2448 DETECT_MISMATCH(ndisks, "md_all"); 2449 DETECT_MISMATCH(balance, "md_balance"); 2450 DETECT_MISMATCH(slice, "md_slice"); 2451 DETECT_MISMATCH(mediasize, "md_mediasize"); 2452 #undef DETECT_MISMATCH 2453 if (mismatch != NULL) { 2454 G_MIRROR_DEBUG(0, "Found a mismatching '%s' " 2455 "field on %s (device %s) (found=%ju " 2456 "newest=%ju).", mismatch, 2457 g_mirror_get_diskname(disk), sc->sc_name, 2458 found, newest); 2459 g_mirror_destroy_disk(disk); 2460 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2461 continue; 2462 } 2463 } 2464 2465 KASSERT(sc->sc_provider == NULL, 2466 ("Non-NULL provider in STARTING state (%s).", sc->sc_name)); 2467 /* 2468 * Are we ready? If the timeout (force is true) has expired, and 2469 * any disks are present, then yes. If we're permitted to launch 2470 * before the timeout has expired and the expected number of 2471 * current-generation mirror disks have been tasted, then yes. 2472 */ 2473 ndisks = g_mirror_ndisks(sc, -1); 2474 if ((force && ndisks > 0) || 2475 (g_launch_mirror_before_timeout && ndisks == sc->sc_ndisks)) { 2476 ; 2477 } else if (ndisks == 0) { 2478 /* 2479 * Disks went down in starting phase, so destroy 2480 * device. 2481 */ 2482 g_mirror_timeout_drain(sc); 2483 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2484 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 2485 sc->sc_rootmount); 2486 root_mount_rel(sc->sc_rootmount); 2487 sc->sc_rootmount = NULL; 2488 return; 2489 } else { 2490 return; 2491 } 2492 2493 /* 2494 * Activate all disks with the biggest syncid. 2495 */ 2496 if (force) { 2497 /* 2498 * If 'force' is true, we have been called due to 2499 * timeout, so don't bother canceling timeout. 2500 */ 2501 ndisks = 0; 2502 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2503 if ((disk->d_flags & 2504 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2505 ndisks++; 2506 } 2507 } 2508 if (ndisks == 0) { 2509 /* No valid disks found, destroy device. */ 2510 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2511 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2512 __LINE__, sc->sc_rootmount); 2513 root_mount_rel(sc->sc_rootmount); 2514 sc->sc_rootmount = NULL; 2515 return; 2516 } 2517 } else { 2518 /* Cancel timeout. */ 2519 g_mirror_timeout_drain(sc); 2520 } 2521 2522 /* 2523 * Here we need to look for dirty disks and if all disks 2524 * with the biggest syncid are dirty, we have to choose 2525 * one with the biggest priority and rebuild the rest. 2526 */ 2527 /* 2528 * Find the number of dirty disks with the biggest syncid. 2529 * Find the number of disks with the biggest syncid. 2530 * While here, find a disk with the biggest priority. 2531 */ 2532 dirty = ndisks = 0; 2533 pdisk = NULL; 2534 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2535 if (disk->d_sync.ds_syncid != sc->sc_syncid) 2536 continue; 2537 if ((disk->d_flags & 2538 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2539 continue; 2540 } 2541 ndisks++; 2542 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 2543 dirty++; 2544 if (pdisk == NULL || 2545 pdisk->d_priority < disk->d_priority) { 2546 pdisk = disk; 2547 } 2548 } 2549 } 2550 if (dirty == 0) { 2551 /* No dirty disks at all, great. */ 2552 } else if (dirty == ndisks) { 2553 /* 2554 * Force synchronization for all dirty disks except one 2555 * with the biggest priority. 2556 */ 2557 KASSERT(pdisk != NULL, ("pdisk == NULL")); 2558 G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a " 2559 "master disk for synchronization.", 2560 g_mirror_get_diskname(pdisk), sc->sc_name); 2561 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2562 if (disk->d_sync.ds_syncid != sc->sc_syncid) 2563 continue; 2564 if ((disk->d_flags & 2565 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2566 continue; 2567 } 2568 KASSERT((disk->d_flags & 2569 G_MIRROR_DISK_FLAG_DIRTY) != 0, 2570 ("Disk %s isn't marked as dirty.", 2571 g_mirror_get_diskname(disk))); 2572 /* Skip the disk with the biggest priority. */ 2573 if (disk == pdisk) 2574 continue; 2575 disk->d_sync.ds_syncid = 0; 2576 } 2577 } else if (dirty < ndisks) { 2578 /* 2579 * Force synchronization for all dirty disks. 2580 * We have some non-dirty disks. 2581 */ 2582 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2583 if (disk->d_sync.ds_syncid != sc->sc_syncid) 2584 continue; 2585 if ((disk->d_flags & 2586 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2587 continue; 2588 } 2589 if ((disk->d_flags & 2590 G_MIRROR_DISK_FLAG_DIRTY) == 0) { 2591 continue; 2592 } 2593 disk->d_sync.ds_syncid = 0; 2594 } 2595 } 2596 2597 /* Reset hint. */ 2598 sc->sc_hint = NULL; 2599 if (force) { 2600 /* Remember to bump syncid on first write. */ 2601 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2602 } 2603 state = G_MIRROR_DEVICE_STATE_RUNNING; 2604 G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.", 2605 sc->sc_name, g_mirror_device_state2str(sc->sc_state), 2606 g_mirror_device_state2str(state)); 2607 sc->sc_state = state; 2608 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2609 state = g_mirror_determine_state(disk); 2610 g_mirror_event_send(disk, state, 2611 G_MIRROR_EVENT_DONTWAIT); 2612 if (state == G_MIRROR_DISK_STATE_STALE) 2613 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2614 } 2615 break; 2616 } 2617 case G_MIRROR_DEVICE_STATE_RUNNING: 2618 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 && 2619 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2620 /* 2621 * No usable disks, so destroy the device. 2622 */ 2623 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2624 break; 2625 } else if (g_mirror_ndisks(sc, 2626 G_MIRROR_DISK_STATE_ACTIVE) > 0 && 2627 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2628 /* 2629 * We have active disks, launch provider if it doesn't 2630 * exist. 2631 */ 2632 if (sc->sc_provider == NULL) 2633 g_mirror_launch_provider(sc); 2634 if (sc->sc_rootmount != NULL) { 2635 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2636 __LINE__, sc->sc_rootmount); 2637 root_mount_rel(sc->sc_rootmount); 2638 sc->sc_rootmount = NULL; 2639 } 2640 } 2641 /* 2642 * Genid should be bumped immediately, so do it here. 2643 */ 2644 if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID) != 0) { 2645 sc->sc_bump_id &= ~G_MIRROR_BUMP_GENID; 2646 g_mirror_bump_genid(sc); 2647 } 2648 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID_NOW) != 0) { 2649 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID_NOW; 2650 g_mirror_bump_syncid(sc); 2651 } 2652 break; 2653 default: 2654 KASSERT(1 == 0, ("Wrong device state (%s, %s).", 2655 sc->sc_name, g_mirror_device_state2str(sc->sc_state))); 2656 break; 2657 } 2658 } 2659 2660 /* 2661 * Update disk state and device state if needed. 2662 */ 2663 #define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \ 2664 "Disk %s state changed from %s to %s (device %s).", \ 2665 g_mirror_get_diskname(disk), \ 2666 g_mirror_disk_state2str(disk->d_state), \ 2667 g_mirror_disk_state2str(state), sc->sc_name) 2668 static int 2669 g_mirror_update_disk(struct g_mirror_disk *disk, u_int state) 2670 { 2671 struct g_mirror_softc *sc; 2672 2673 sc = disk->d_softc; 2674 sx_assert(&sc->sc_lock, SX_XLOCKED); 2675 2676 again: 2677 G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.", 2678 g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state), 2679 g_mirror_disk_state2str(state)); 2680 switch (state) { 2681 case G_MIRROR_DISK_STATE_NEW: 2682 /* 2683 * Possible scenarios: 2684 * 1. New disk arrive. 2685 */ 2686 /* Previous state should be NONE. */ 2687 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE, 2688 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2689 g_mirror_disk_state2str(disk->d_state))); 2690 DISK_STATE_CHANGED(); 2691 2692 disk->d_state = state; 2693 g_topology_lock(); 2694 if (LIST_EMPTY(&sc->sc_disks)) 2695 LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next); 2696 else { 2697 struct g_mirror_disk *dp; 2698 2699 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 2700 if (disk->d_priority >= dp->d_priority) { 2701 LIST_INSERT_BEFORE(dp, disk, d_next); 2702 dp = NULL; 2703 break; 2704 } 2705 if (LIST_NEXT(dp, d_next) == NULL) 2706 break; 2707 } 2708 if (dp != NULL) 2709 LIST_INSERT_AFTER(dp, disk, d_next); 2710 } 2711 g_topology_unlock(); 2712 G_MIRROR_DEBUG(1, "Device %s: provider %s detected.", 2713 sc->sc_name, g_mirror_get_diskname(disk)); 2714 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 2715 break; 2716 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2717 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2718 g_mirror_device_state2str(sc->sc_state), 2719 g_mirror_get_diskname(disk), 2720 g_mirror_disk_state2str(disk->d_state))); 2721 state = g_mirror_determine_state(disk); 2722 if (state != G_MIRROR_DISK_STATE_NONE) 2723 goto again; 2724 break; 2725 case G_MIRROR_DISK_STATE_ACTIVE: 2726 /* 2727 * Possible scenarios: 2728 * 1. New disk does not need synchronization. 2729 * 2. Synchronization process finished successfully. 2730 */ 2731 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2732 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2733 g_mirror_device_state2str(sc->sc_state), 2734 g_mirror_get_diskname(disk), 2735 g_mirror_disk_state2str(disk->d_state))); 2736 /* Previous state should be NEW or SYNCHRONIZING. */ 2737 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW || 2738 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2739 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2740 g_mirror_disk_state2str(disk->d_state))); 2741 DISK_STATE_CHANGED(); 2742 2743 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2744 disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2745 disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC; 2746 g_mirror_sync_stop(disk, 0); 2747 } 2748 disk->d_state = state; 2749 disk->d_sync.ds_offset = 0; 2750 disk->d_sync.ds_offset_done = 0; 2751 g_mirror_update_idle(sc, disk); 2752 g_mirror_update_metadata(disk); 2753 G_MIRROR_DEBUG(1, "Device %s: provider %s activated.", 2754 sc->sc_name, g_mirror_get_diskname(disk)); 2755 break; 2756 case G_MIRROR_DISK_STATE_STALE: 2757 /* 2758 * Possible scenarios: 2759 * 1. Stale disk was connected. 2760 */ 2761 /* Previous state should be NEW. */ 2762 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2763 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2764 g_mirror_disk_state2str(disk->d_state))); 2765 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2766 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2767 g_mirror_device_state2str(sc->sc_state), 2768 g_mirror_get_diskname(disk), 2769 g_mirror_disk_state2str(disk->d_state))); 2770 /* 2771 * STALE state is only possible if device is marked 2772 * NOAUTOSYNC. 2773 */ 2774 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0, 2775 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2776 g_mirror_device_state2str(sc->sc_state), 2777 g_mirror_get_diskname(disk), 2778 g_mirror_disk_state2str(disk->d_state))); 2779 DISK_STATE_CHANGED(); 2780 2781 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2782 disk->d_state = state; 2783 g_mirror_update_metadata(disk); 2784 G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.", 2785 sc->sc_name, g_mirror_get_diskname(disk)); 2786 break; 2787 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 2788 /* 2789 * Possible scenarios: 2790 * 1. Disk which needs synchronization was connected. 2791 */ 2792 /* Previous state should be NEW. */ 2793 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2794 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2795 g_mirror_disk_state2str(disk->d_state))); 2796 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2797 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2798 g_mirror_device_state2str(sc->sc_state), 2799 g_mirror_get_diskname(disk), 2800 g_mirror_disk_state2str(disk->d_state))); 2801 DISK_STATE_CHANGED(); 2802 2803 if (disk->d_state == G_MIRROR_DISK_STATE_NEW) 2804 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2805 disk->d_state = state; 2806 if (sc->sc_provider != NULL) { 2807 g_mirror_sync_start(disk); 2808 g_mirror_update_metadata(disk); 2809 } 2810 break; 2811 case G_MIRROR_DISK_STATE_DISCONNECTED: 2812 /* 2813 * Possible scenarios: 2814 * 1. Device wasn't running yet, but disk disappear. 2815 * 2. Disk was active and disapppear. 2816 * 3. Disk disappear during synchronization process. 2817 */ 2818 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) { 2819 /* 2820 * Previous state should be ACTIVE, STALE or 2821 * SYNCHRONIZING. 2822 */ 2823 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 2824 disk->d_state == G_MIRROR_DISK_STATE_STALE || 2825 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2826 ("Wrong disk state (%s, %s).", 2827 g_mirror_get_diskname(disk), 2828 g_mirror_disk_state2str(disk->d_state))); 2829 } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) { 2830 /* Previous state should be NEW. */ 2831 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2832 ("Wrong disk state (%s, %s).", 2833 g_mirror_get_diskname(disk), 2834 g_mirror_disk_state2str(disk->d_state))); 2835 /* 2836 * Reset bumping syncid if disk disappeared in STARTING 2837 * state. 2838 */ 2839 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) 2840 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 2841 #ifdef INVARIANTS 2842 } else { 2843 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).", 2844 sc->sc_name, 2845 g_mirror_device_state2str(sc->sc_state), 2846 g_mirror_get_diskname(disk), 2847 g_mirror_disk_state2str(disk->d_state))); 2848 #endif 2849 } 2850 DISK_STATE_CHANGED(); 2851 G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.", 2852 sc->sc_name, g_mirror_get_diskname(disk)); 2853 2854 g_mirror_destroy_disk(disk); 2855 break; 2856 case G_MIRROR_DISK_STATE_DESTROY: 2857 { 2858 int error; 2859 2860 error = g_mirror_clear_metadata(disk); 2861 if (error != 0) { 2862 G_MIRROR_DEBUG(0, 2863 "Device %s: failed to clear metadata on %s: %d.", 2864 sc->sc_name, g_mirror_get_diskname(disk), error); 2865 break; 2866 } 2867 DISK_STATE_CHANGED(); 2868 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", 2869 sc->sc_name, g_mirror_get_diskname(disk)); 2870 2871 g_mirror_destroy_disk(disk); 2872 sc->sc_ndisks--; 2873 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2874 g_mirror_update_metadata(disk); 2875 } 2876 break; 2877 } 2878 default: 2879 KASSERT(1 == 0, ("Unknown state (%u).", state)); 2880 break; 2881 } 2882 return (0); 2883 } 2884 #undef DISK_STATE_CHANGED 2885 2886 int 2887 g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md) 2888 { 2889 struct g_provider *pp; 2890 u_char *buf; 2891 int error; 2892 2893 g_topology_assert(); 2894 2895 error = g_access(cp, 1, 0, 0); 2896 if (error != 0) 2897 return (error); 2898 pp = cp->provider; 2899 g_topology_unlock(); 2900 /* Metadata are stored on last sector. */ 2901 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 2902 &error); 2903 g_topology_lock(); 2904 g_access(cp, -1, 0, 0); 2905 if (buf == NULL) { 2906 G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).", 2907 cp->provider->name, error); 2908 return (error); 2909 } 2910 2911 /* Decode metadata. */ 2912 error = mirror_metadata_decode(buf, md); 2913 g_free(buf); 2914 if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0) 2915 return (EINVAL); 2916 if (md->md_version > G_MIRROR_VERSION) { 2917 G_MIRROR_DEBUG(0, 2918 "Kernel module is too old to handle metadata from %s.", 2919 cp->provider->name); 2920 return (EINVAL); 2921 } 2922 if (error != 0) { 2923 G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.", 2924 cp->provider->name); 2925 return (error); 2926 } 2927 2928 return (0); 2929 } 2930 2931 static int 2932 g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp, 2933 struct g_mirror_metadata *md) 2934 { 2935 2936 G_MIRROR_DEBUG(2, "%s: md_did 0x%u disk %s device %s md_all 0x%x " 2937 "sc_ndisks 0x%x md_slice 0x%x sc_slice 0x%x md_balance 0x%x " 2938 "sc_balance 0x%x sc_mediasize 0x%jx pp_mediasize 0x%jx " 2939 "md_sectorsize 0x%x sc_sectorsize 0x%x md_mflags 0x%jx " 2940 "md_dflags 0x%jx md_syncid 0x%x md_genid 0x%x md_priority 0x%x " 2941 "sc_state 0x%x.", 2942 __func__, md->md_did, pp->name, sc->sc_name, md->md_all, 2943 sc->sc_ndisks, md->md_slice, sc->sc_slice, md->md_balance, 2944 sc->sc_balance, (uintmax_t)sc->sc_mediasize, 2945 (uintmax_t)pp->mediasize, md->md_sectorsize, sc->sc_sectorsize, 2946 (uintmax_t)md->md_mflags, (uintmax_t)md->md_dflags, md->md_syncid, 2947 md->md_genid, md->md_priority, sc->sc_state); 2948 2949 if (g_mirror_id2disk(sc, md->md_did) != NULL) { 2950 G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.", 2951 pp->name, md->md_did); 2952 return (EEXIST); 2953 } 2954 if (sc->sc_mediasize > pp->mediasize) { 2955 G_MIRROR_DEBUG(1, 2956 "Invalid size of disk %s (device %s), skipping.", pp->name, 2957 sc->sc_name); 2958 return (EINVAL); 2959 } 2960 if (md->md_sectorsize != sc->sc_sectorsize) { 2961 G_MIRROR_DEBUG(1, 2962 "Invalid '%s' field on disk %s (device %s), skipping.", 2963 "md_sectorsize", pp->name, sc->sc_name); 2964 return (EINVAL); 2965 } 2966 if ((sc->sc_sectorsize % pp->sectorsize) != 0) { 2967 G_MIRROR_DEBUG(1, 2968 "Invalid sector size of disk %s (device %s), skipping.", 2969 pp->name, sc->sc_name); 2970 return (EINVAL); 2971 } 2972 if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) { 2973 G_MIRROR_DEBUG(1, 2974 "Invalid device flags on disk %s (device %s), skipping.", 2975 pp->name, sc->sc_name); 2976 return (EINVAL); 2977 } 2978 if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) { 2979 G_MIRROR_DEBUG(1, 2980 "Invalid disk flags on disk %s (device %s), skipping.", 2981 pp->name, sc->sc_name); 2982 return (EINVAL); 2983 } 2984 return (0); 2985 } 2986 2987 int 2988 g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp, 2989 struct g_mirror_metadata *md) 2990 { 2991 struct g_mirror_disk *disk; 2992 int error; 2993 2994 g_topology_assert_not(); 2995 G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name); 2996 2997 error = g_mirror_check_metadata(sc, pp, md); 2998 if (error != 0) 2999 return (error); 3000 3001 if (md->md_genid < sc->sc_genid) { 3002 G_MIRROR_DEBUG(0, "Component %s (device %s) broken, skipping.", 3003 pp->name, sc->sc_name); 3004 return (EINVAL); 3005 } 3006 3007 /* 3008 * If the component disk we're tasting has newer metadata than the 3009 * STARTING gmirror device, refresh the device from the component. 3010 */ 3011 error = g_mirror_refresh_device(sc, pp, md); 3012 if (error != 0) 3013 return (error); 3014 3015 disk = g_mirror_init_disk(sc, pp, md, &error); 3016 if (disk == NULL) 3017 return (error); 3018 error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW, 3019 G_MIRROR_EVENT_WAIT); 3020 if (error != 0) 3021 return (error); 3022 if (md->md_version < G_MIRROR_VERSION) { 3023 G_MIRROR_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).", 3024 pp->name, md->md_version, G_MIRROR_VERSION); 3025 g_mirror_update_metadata(disk); 3026 } 3027 return (0); 3028 } 3029 3030 static void 3031 g_mirror_destroy_delayed(void *arg, int flag) 3032 { 3033 struct g_mirror_softc *sc; 3034 int error; 3035 3036 if (flag == EV_CANCEL) { 3037 G_MIRROR_DEBUG(1, "Destroying canceled."); 3038 return; 3039 } 3040 sc = arg; 3041 g_topology_unlock(); 3042 sx_xlock(&sc->sc_lock); 3043 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) == 0, 3044 ("DESTROY flag set on %s.", sc->sc_name)); 3045 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_CLOSEWAIT) != 0, 3046 ("CLOSEWAIT flag not set on %s.", sc->sc_name)); 3047 G_MIRROR_DEBUG(1, "Destroying %s (delayed).", sc->sc_name); 3048 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_SOFT); 3049 if (error != 0) { 3050 G_MIRROR_DEBUG(0, "Cannot destroy %s (error=%d).", 3051 sc->sc_name, error); 3052 sx_xunlock(&sc->sc_lock); 3053 } 3054 g_topology_lock(); 3055 } 3056 3057 static int 3058 g_mirror_access(struct g_provider *pp, int acr, int acw, int ace) 3059 { 3060 struct g_mirror_softc *sc; 3061 int error = 0; 3062 3063 g_topology_assert(); 3064 G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr, 3065 acw, ace); 3066 3067 sc = pp->private; 3068 KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name)); 3069 3070 g_topology_unlock(); 3071 sx_xlock(&sc->sc_lock); 3072 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0 || 3073 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_CLOSEWAIT) != 0 || 3074 LIST_EMPTY(&sc->sc_disks)) { 3075 if (acr > 0 || acw > 0 || ace > 0) 3076 error = ENXIO; 3077 goto end; 3078 } 3079 sc->sc_provider_open += acr + acw + ace; 3080 if (pp->acw + acw == 0) 3081 g_mirror_idle(sc, 0); 3082 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_CLOSEWAIT) != 0 && 3083 sc->sc_provider_open == 0) 3084 g_post_event(g_mirror_destroy_delayed, sc, M_WAITOK, sc, NULL); 3085 end: 3086 sx_xunlock(&sc->sc_lock); 3087 g_topology_lock(); 3088 return (error); 3089 } 3090 3091 static void 3092 g_mirror_reinit_from_metadata(struct g_mirror_softc *sc, 3093 const struct g_mirror_metadata *md) 3094 { 3095 3096 sc->sc_genid = md->md_genid; 3097 sc->sc_syncid = md->md_syncid; 3098 3099 sc->sc_slice = md->md_slice; 3100 sc->sc_balance = md->md_balance; 3101 sc->sc_mediasize = md->md_mediasize; 3102 sc->sc_ndisks = md->md_all; 3103 sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_MASK; 3104 sc->sc_flags |= (md->md_mflags & G_MIRROR_DEVICE_FLAG_MASK); 3105 } 3106 3107 struct g_geom * 3108 g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md, 3109 u_int type) 3110 { 3111 struct g_mirror_softc *sc; 3112 struct g_geom *gp; 3113 int error, timeout; 3114 3115 g_topology_assert(); 3116 G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name, 3117 md->md_mid); 3118 3119 /* One disk is minimum. */ 3120 if (md->md_all < 1) 3121 return (NULL); 3122 /* 3123 * Action geom. 3124 */ 3125 gp = g_new_geomf(mp, "%s", md->md_name); 3126 sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO); 3127 gp->start = g_mirror_start; 3128 gp->orphan = g_mirror_orphan; 3129 gp->access = g_mirror_access; 3130 gp->dumpconf = g_mirror_dumpconf; 3131 3132 sc->sc_type = type; 3133 sc->sc_id = md->md_mid; 3134 g_mirror_reinit_from_metadata(sc, md); 3135 sc->sc_sectorsize = md->md_sectorsize; 3136 sc->sc_bump_id = 0; 3137 sc->sc_idle = 1; 3138 sc->sc_last_write = time_uptime; 3139 sc->sc_writes = 0; 3140 sc->sc_refcnt = 1; 3141 sx_init(&sc->sc_lock, "gmirror:lock"); 3142 TAILQ_INIT(&sc->sc_queue); 3143 mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF); 3144 TAILQ_INIT(&sc->sc_regular_delayed); 3145 TAILQ_INIT(&sc->sc_inflight); 3146 TAILQ_INIT(&sc->sc_sync_delayed); 3147 LIST_INIT(&sc->sc_disks); 3148 TAILQ_INIT(&sc->sc_events); 3149 mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF); 3150 callout_init(&sc->sc_callout, 1); 3151 mtx_init(&sc->sc_done_mtx, "gmirror:done", NULL, MTX_DEF); 3152 sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING; 3153 gp->softc = sc; 3154 sc->sc_geom = gp; 3155 sc->sc_provider = NULL; 3156 sc->sc_provider_open = 0; 3157 /* 3158 * Synchronization geom. 3159 */ 3160 gp = g_new_geomf(mp, "%s.sync", md->md_name); 3161 gp->softc = sc; 3162 gp->orphan = g_mirror_orphan; 3163 sc->sc_sync.ds_geom = gp; 3164 sc->sc_sync.ds_ndisks = 0; 3165 error = kproc_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0, 3166 "g_mirror %s", md->md_name); 3167 if (error != 0) { 3168 G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.", 3169 sc->sc_name); 3170 g_destroy_geom(sc->sc_sync.ds_geom); 3171 g_destroy_geom(sc->sc_geom); 3172 g_mirror_free_device(sc); 3173 return (NULL); 3174 } 3175 3176 G_MIRROR_DEBUG(1, "Device %s created (%u components, id=%u).", 3177 sc->sc_name, sc->sc_ndisks, sc->sc_id); 3178 3179 sc->sc_rootmount = root_mount_hold("GMIRROR"); 3180 G_MIRROR_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount); 3181 3182 /* 3183 * Schedule startup timeout. 3184 */ 3185 timeout = g_mirror_timeout * hz; 3186 sc->sc_timeout_event = malloc(sizeof(struct g_mirror_event), M_MIRROR, 3187 M_WAITOK); 3188 callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc); 3189 return (sc->sc_geom); 3190 } 3191 3192 int 3193 g_mirror_destroy(struct g_mirror_softc *sc, int how) 3194 { 3195 struct g_mirror_disk *disk; 3196 3197 g_topology_assert_not(); 3198 sx_assert(&sc->sc_lock, SX_XLOCKED); 3199 3200 if (sc->sc_provider_open != 0) { 3201 switch (how) { 3202 case G_MIRROR_DESTROY_SOFT: 3203 G_MIRROR_DEBUG(1, 3204 "Device %s is still open (%d).", sc->sc_name, 3205 sc->sc_provider_open); 3206 return (EBUSY); 3207 case G_MIRROR_DESTROY_DELAYED: 3208 G_MIRROR_DEBUG(1, 3209 "Device %s will be destroyed on last close.", 3210 sc->sc_name); 3211 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 3212 if (disk->d_state == 3213 G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3214 g_mirror_sync_stop(disk, 1); 3215 } 3216 } 3217 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_CLOSEWAIT; 3218 return (EBUSY); 3219 case G_MIRROR_DESTROY_HARD: 3220 G_MIRROR_DEBUG(1, "Device %s is still open, so it " 3221 "can't be definitely removed.", sc->sc_name); 3222 } 3223 } 3224 3225 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 3226 sx_xunlock(&sc->sc_lock); 3227 return (0); 3228 } 3229 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 3230 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DRAIN; 3231 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 3232 sx_xunlock(&sc->sc_lock); 3233 mtx_lock(&sc->sc_queue_mtx); 3234 wakeup(sc); 3235 mtx_unlock(&sc->sc_queue_mtx); 3236 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker); 3237 while (sc->sc_worker != NULL) 3238 tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5); 3239 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker); 3240 sx_xlock(&sc->sc_lock); 3241 g_mirror_destroy_device(sc); 3242 return (0); 3243 } 3244 3245 static void 3246 g_mirror_taste_orphan(struct g_consumer *cp) 3247 { 3248 3249 KASSERT(1 == 0, ("%s called while tasting %s.", __func__, 3250 cp->provider->name)); 3251 } 3252 3253 static struct g_geom * 3254 g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 3255 { 3256 struct g_mirror_metadata md; 3257 struct g_mirror_softc *sc; 3258 struct g_consumer *cp; 3259 struct g_geom *gp; 3260 int error; 3261 3262 g_topology_assert(); 3263 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 3264 G_MIRROR_DEBUG(2, "Tasting %s.", pp->name); 3265 3266 gp = g_new_geomf(mp, "mirror:taste"); 3267 /* 3268 * This orphan function should be never called. 3269 */ 3270 gp->orphan = g_mirror_taste_orphan; 3271 cp = g_new_consumer(gp); 3272 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 3273 error = g_attach(cp, pp); 3274 if (error == 0) { 3275 error = g_mirror_read_metadata(cp, &md); 3276 g_detach(cp); 3277 } 3278 g_destroy_consumer(cp); 3279 g_destroy_geom(gp); 3280 if (error != 0) 3281 return (NULL); 3282 gp = NULL; 3283 3284 if (md.md_provider[0] != '\0' && 3285 !g_compare_names(md.md_provider, pp->name)) 3286 return (NULL); 3287 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize) 3288 return (NULL); 3289 if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) { 3290 G_MIRROR_DEBUG(0, 3291 "Device %s: provider %s marked as inactive, skipping.", 3292 md.md_name, pp->name); 3293 return (NULL); 3294 } 3295 if (g_mirror_debug >= 2) 3296 mirror_metadata_dump(&md); 3297 3298 /* 3299 * Let's check if device already exists. 3300 */ 3301 sc = NULL; 3302 LIST_FOREACH(gp, &mp->geom, geom) { 3303 sc = gp->softc; 3304 if (sc == NULL) 3305 continue; 3306 if (sc->sc_type != G_MIRROR_TYPE_AUTOMATIC) 3307 continue; 3308 if (sc->sc_sync.ds_geom == gp) 3309 continue; 3310 if (strcmp(md.md_name, sc->sc_name) != 0) 3311 continue; 3312 if (md.md_mid != sc->sc_id) { 3313 G_MIRROR_DEBUG(0, "Device %s already configured.", 3314 sc->sc_name); 3315 return (NULL); 3316 } 3317 break; 3318 } 3319 if (gp == NULL) { 3320 gp = g_mirror_create(mp, &md, G_MIRROR_TYPE_AUTOMATIC); 3321 if (gp == NULL) { 3322 G_MIRROR_DEBUG(0, "Cannot create device %s.", 3323 md.md_name); 3324 return (NULL); 3325 } 3326 sc = gp->softc; 3327 } 3328 G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name); 3329 g_topology_unlock(); 3330 sx_xlock(&sc->sc_lock); 3331 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_TASTING; 3332 error = g_mirror_add_disk(sc, pp, &md); 3333 sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_TASTING; 3334 if (error != 0) { 3335 G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).", 3336 pp->name, gp->name, error); 3337 if (LIST_EMPTY(&sc->sc_disks)) { 3338 g_cancel_event(sc); 3339 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3340 g_topology_lock(); 3341 return (NULL); 3342 } 3343 gp = NULL; 3344 } 3345 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 3346 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3347 g_topology_lock(); 3348 return (NULL); 3349 } 3350 sx_xunlock(&sc->sc_lock); 3351 g_topology_lock(); 3352 return (gp); 3353 } 3354 3355 static void 3356 g_mirror_resize(struct g_consumer *cp) 3357 { 3358 struct g_mirror_disk *disk; 3359 3360 g_topology_assert(); 3361 g_trace(G_T_TOPOLOGY, "%s(%s)", __func__, cp->provider->name); 3362 3363 disk = cp->private; 3364 if (disk == NULL) 3365 return; 3366 g_topology_unlock(); 3367 g_mirror_update_metadata(disk); 3368 g_topology_lock(); 3369 } 3370 3371 static int 3372 g_mirror_destroy_geom(struct gctl_req *req __unused, 3373 struct g_class *mp __unused, struct g_geom *gp) 3374 { 3375 struct g_mirror_softc *sc; 3376 int error; 3377 3378 g_topology_unlock(); 3379 sc = gp->softc; 3380 sx_xlock(&sc->sc_lock); 3381 g_cancel_event(sc); 3382 error = g_mirror_destroy(gp->softc, G_MIRROR_DESTROY_SOFT); 3383 if (error != 0) 3384 sx_xunlock(&sc->sc_lock); 3385 g_topology_lock(); 3386 return (error); 3387 } 3388 3389 static void 3390 g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 3391 struct g_consumer *cp, struct g_provider *pp) 3392 { 3393 struct g_mirror_softc *sc; 3394 3395 g_topology_assert(); 3396 3397 sc = gp->softc; 3398 if (sc == NULL) 3399 return; 3400 /* Skip synchronization geom. */ 3401 if (gp == sc->sc_sync.ds_geom) 3402 return; 3403 if (pp != NULL) { 3404 /* Nothing here. */ 3405 } else if (cp != NULL) { 3406 struct g_mirror_disk *disk; 3407 3408 disk = cp->private; 3409 if (disk == NULL) 3410 return; 3411 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id); 3412 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3413 sbuf_printf(sb, "%s<Synchronized>", indent); 3414 if (disk->d_sync.ds_offset == 0) 3415 sbuf_cat(sb, "0%"); 3416 else 3417 sbuf_printf(sb, "%u%%", 3418 (u_int)((disk->d_sync.ds_offset * 100) / 3419 sc->sc_mediasize)); 3420 sbuf_cat(sb, "</Synchronized>\n"); 3421 if (disk->d_sync.ds_offset > 0) 3422 sbuf_printf(sb, "%s<BytesSynced>%jd" 3423 "</BytesSynced>\n", indent, 3424 (intmax_t)disk->d_sync.ds_offset); 3425 } 3426 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, 3427 disk->d_sync.ds_syncid); 3428 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, 3429 disk->d_genid); 3430 sbuf_printf(sb, "%s<Flags>", indent); 3431 if (disk->d_flags == 0) 3432 sbuf_cat(sb, "NONE"); 3433 else { 3434 int first = 1; 3435 3436 #define ADD_FLAG(flag, name) do { \ 3437 if ((disk->d_flags & (flag)) != 0) { \ 3438 if (!first) \ 3439 sbuf_cat(sb, ", "); \ 3440 else \ 3441 first = 0; \ 3442 sbuf_cat(sb, name); \ 3443 } \ 3444 } while (0) 3445 ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY"); 3446 ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED"); 3447 ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE"); 3448 ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING, 3449 "SYNCHRONIZING"); 3450 ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC"); 3451 ADD_FLAG(G_MIRROR_DISK_FLAG_BROKEN, "BROKEN"); 3452 #undef ADD_FLAG 3453 } 3454 sbuf_cat(sb, "</Flags>\n"); 3455 sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent, 3456 disk->d_priority); 3457 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 3458 g_mirror_disk_state2str(disk->d_state)); 3459 } else { 3460 sbuf_printf(sb, "%s<Type>", indent); 3461 switch (sc->sc_type) { 3462 case G_MIRROR_TYPE_AUTOMATIC: 3463 sbuf_cat(sb, "AUTOMATIC"); 3464 break; 3465 case G_MIRROR_TYPE_MANUAL: 3466 sbuf_cat(sb, "MANUAL"); 3467 break; 3468 default: 3469 sbuf_cat(sb, "UNKNOWN"); 3470 break; 3471 } 3472 sbuf_cat(sb, "</Type>\n"); 3473 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id); 3474 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid); 3475 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid); 3476 sbuf_printf(sb, "%s<Flags>", indent); 3477 if (sc->sc_flags == 0) 3478 sbuf_cat(sb, "NONE"); 3479 else { 3480 int first = 1; 3481 3482 #define ADD_FLAG(flag, name) do { \ 3483 if ((sc->sc_flags & (flag)) != 0) { \ 3484 if (!first) \ 3485 sbuf_cat(sb, ", "); \ 3486 else \ 3487 first = 0; \ 3488 sbuf_cat(sb, name); \ 3489 } \ 3490 } while (0) 3491 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC"); 3492 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC"); 3493 #undef ADD_FLAG 3494 } 3495 sbuf_cat(sb, "</Flags>\n"); 3496 sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent, 3497 (u_int)sc->sc_slice); 3498 sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent, 3499 balance_name(sc->sc_balance)); 3500 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent, 3501 sc->sc_ndisks); 3502 sbuf_printf(sb, "%s<State>", indent); 3503 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 3504 sbuf_printf(sb, "%s", "STARTING"); 3505 else if (sc->sc_ndisks == 3506 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE)) 3507 sbuf_printf(sb, "%s", "COMPLETE"); 3508 else 3509 sbuf_printf(sb, "%s", "DEGRADED"); 3510 sbuf_cat(sb, "</State>\n"); 3511 } 3512 } 3513 3514 static void 3515 g_mirror_shutdown_post_sync(void *arg, int howto) 3516 { 3517 struct g_class *mp; 3518 struct g_geom *gp, *gp2; 3519 struct g_mirror_softc *sc; 3520 int error; 3521 3522 if (KERNEL_PANICKED()) 3523 return; 3524 3525 mp = arg; 3526 g_topology_lock(); 3527 g_mirror_shutdown = 1; 3528 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 3529 if ((sc = gp->softc) == NULL) 3530 continue; 3531 /* Skip synchronization geom. */ 3532 if (gp == sc->sc_sync.ds_geom) 3533 continue; 3534 g_topology_unlock(); 3535 sx_xlock(&sc->sc_lock); 3536 g_mirror_idle(sc, -1); 3537 g_cancel_event(sc); 3538 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_DELAYED); 3539 if (error != 0) 3540 sx_xunlock(&sc->sc_lock); 3541 g_topology_lock(); 3542 } 3543 g_topology_unlock(); 3544 } 3545 3546 static void 3547 g_mirror_init(struct g_class *mp) 3548 { 3549 3550 g_mirror_post_sync = EVENTHANDLER_REGISTER(shutdown_post_sync, 3551 g_mirror_shutdown_post_sync, mp, SHUTDOWN_PRI_FIRST); 3552 if (g_mirror_post_sync == NULL) 3553 G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event."); 3554 } 3555 3556 static void 3557 g_mirror_fini(struct g_class *mp) 3558 { 3559 3560 if (g_mirror_post_sync != NULL) 3561 EVENTHANDLER_DEREGISTER(shutdown_post_sync, g_mirror_post_sync); 3562 } 3563 3564 /* 3565 * Refresh the mirror device's metadata when gmirror encounters a newer 3566 * generation as the individual components are being added to the mirror set. 3567 */ 3568 static int 3569 g_mirror_refresh_device(struct g_mirror_softc *sc, const struct g_provider *pp, 3570 const struct g_mirror_metadata *md) 3571 { 3572 3573 g_topology_assert_not(); 3574 sx_assert(&sc->sc_lock, SX_XLOCKED); 3575 3576 KASSERT(sc->sc_genid <= md->md_genid, 3577 ("%s: attempted to refresh from stale component %s (device %s) " 3578 "(%u < %u).", __func__, pp->name, sc->sc_name, md->md_genid, 3579 sc->sc_genid)); 3580 3581 if (sc->sc_genid > md->md_genid || (sc->sc_genid == md->md_genid && 3582 sc->sc_syncid >= md->md_syncid)) 3583 return (0); 3584 3585 G_MIRROR_DEBUG(0, "Found newer version for device %s (genid: curr=%u " 3586 "new=%u; syncid: curr=%u new=%u; ndisks: curr=%u new=%u; " 3587 "provider=%s).", sc->sc_name, sc->sc_genid, md->md_genid, 3588 sc->sc_syncid, md->md_syncid, sc->sc_ndisks, md->md_all, pp->name); 3589 3590 if (sc->sc_state != G_MIRROR_DEVICE_STATE_STARTING) { 3591 /* Probable data corruption detected */ 3592 G_MIRROR_DEBUG(0, "Cannot refresh metadata in %s state " 3593 "(device=%s genid=%u). A stale mirror device was launched.", 3594 g_mirror_device_state2str(sc->sc_state), sc->sc_name, 3595 sc->sc_genid); 3596 return (EINVAL); 3597 } 3598 3599 /* Update softc */ 3600 g_mirror_reinit_from_metadata(sc, md); 3601 3602 G_MIRROR_DEBUG(1, "Refresh device %s (id=%u, state=%s) from disk %s " 3603 "(genid=%u syncid=%u md_all=%u).", sc->sc_name, md->md_mid, 3604 g_mirror_device_state2str(sc->sc_state), pp->name, md->md_genid, 3605 md->md_syncid, (unsigned)md->md_all); 3606 3607 return (0); 3608 } 3609 3610 DECLARE_GEOM_CLASS(g_mirror_class, g_mirror); 3611 MODULE_VERSION(geom_mirror, 0); 3612