g_mirror.c revision 133373
1/*- 2 * Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/geom/mirror/g_mirror.c 133373 2004-08-09 11:29:42Z pjd $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/kernel.h> 33#include <sys/module.h> 34#include <sys/limits.h> 35#include <sys/lock.h> 36#include <sys/mutex.h> 37#include <sys/bio.h> 38#include <sys/sysctl.h> 39#include <sys/malloc.h> 40#include <sys/bitstring.h> 41#include <vm/uma.h> 42#include <machine/atomic.h> 43#include <geom/geom.h> 44#include <sys/proc.h> 45#include <sys/kthread.h> 46#include <geom/mirror/g_mirror.h> 47 48 49static MALLOC_DEFINE(M_MIRROR, "mirror data", "GEOM_MIRROR Data"); 50 51SYSCTL_DECL(_kern_geom); 52SYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW, 0, "GEOM_MIRROR stuff"); 53u_int g_mirror_debug = 0; 54SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RW, &g_mirror_debug, 0, 55 "Debug level"); 56static u_int g_mirror_sync_block_size = 131072; 57SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_block_size, CTLFLAG_RW, 58 &g_mirror_sync_block_size, 0, "Synchronization block size"); 59static u_int g_mirror_timeout = 8; 60SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RW, &g_mirror_timeout, 61 0, "Time to wait on all mirror components"); 62static u_int g_mirror_reqs_per_sync = 5; 63SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, reqs_per_sync, CTLFLAG_RW, 64 &g_mirror_reqs_per_sync, 0, 65 "Number of regular I/O requests per synchronization request"); 66static u_int g_mirror_syncs_per_sec = 100; 67SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, syncs_per_sec, CTLFLAG_RW, 68 &g_mirror_syncs_per_sec, 0, 69 "Number of synchronizations requests per second"); 70 71#define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \ 72 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \ 73 msleep((ident), (mtx), (priority), (wmesg), (timeout)); \ 74 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \ 75} while (0) 76 77 78static int g_mirror_destroy_geom(struct gctl_req *req, struct g_class *mp, 79 struct g_geom *gp); 80static g_taste_t g_mirror_taste; 81 82struct g_class g_mirror_class = { 83 .name = G_MIRROR_CLASS_NAME, 84 .version = G_VERSION, 85 .ctlreq = g_mirror_config, 86 .taste = g_mirror_taste, 87 .destroy_geom = g_mirror_destroy_geom 88}; 89 90 91static void g_mirror_destroy_provider(struct g_mirror_softc *sc); 92static int g_mirror_update_disk(struct g_mirror_disk *disk, u_int state); 93static void g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force); 94static void g_mirror_dumpconf(struct sbuf *sb, const char *indent, 95 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp); 96static void g_mirror_sync_stop(struct g_mirror_disk *disk, int type); 97 98 99static const char * 100g_mirror_disk_state2str(int state) 101{ 102 103 switch (state) { 104 case G_MIRROR_DISK_STATE_NONE: 105 return ("NONE"); 106 case G_MIRROR_DISK_STATE_NEW: 107 return ("NEW"); 108 case G_MIRROR_DISK_STATE_ACTIVE: 109 return ("ACTIVE"); 110 case G_MIRROR_DISK_STATE_STALE: 111 return ("STALE"); 112 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 113 return ("SYNCHRONIZING"); 114 case G_MIRROR_DISK_STATE_DISCONNECTED: 115 return ("DISCONNECTED"); 116 case G_MIRROR_DISK_STATE_DESTROY: 117 return ("DESTROY"); 118 default: 119 return ("INVALID"); 120 } 121} 122 123static const char * 124g_mirror_device_state2str(int state) 125{ 126 127 switch (state) { 128 case G_MIRROR_DEVICE_STATE_STARTING: 129 return ("STARTING"); 130 case G_MIRROR_DEVICE_STATE_RUNNING: 131 return ("RUNNING"); 132 default: 133 return ("INVALID"); 134 } 135} 136 137static const char * 138g_mirror_get_diskname(struct g_mirror_disk *disk) 139{ 140 141 if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL) 142 return ("[unknown]"); 143 return (disk->d_name); 144} 145 146/* 147 * --- Events handling functions --- 148 * Events in geom_mirror are used to maintain disks and device status 149 * from one thread to simplify locking. 150 */ 151static void 152g_mirror_event_free(struct g_mirror_event *ep) 153{ 154 155 free(ep, M_MIRROR); 156} 157 158int 159g_mirror_event_send(void *arg, int state, int flags) 160{ 161 struct g_mirror_softc *sc; 162 struct g_mirror_disk *disk; 163 struct g_mirror_event *ep; 164 int error; 165 166 ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK); 167 G_MIRROR_DEBUG(4, "%s: Sending event %p.", __func__, ep); 168 if ((flags & G_MIRROR_EVENT_DEVICE) != 0) { 169 disk = NULL; 170 sc = arg; 171 } else { 172 disk = arg; 173 sc = disk->d_softc; 174 } 175 ep->e_disk = disk; 176 ep->e_state = state; 177 ep->e_flags = flags; 178 ep->e_error = 0; 179 mtx_lock(&sc->sc_events_mtx); 180 TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next); 181 mtx_unlock(&sc->sc_events_mtx); 182 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 183 mtx_lock(&sc->sc_queue_mtx); 184 wakeup(sc); 185 mtx_unlock(&sc->sc_queue_mtx); 186 if ((flags & G_MIRROR_EVENT_DONTWAIT) != 0) 187 return (0); 188 g_topology_assert(); 189 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep); 190 g_topology_unlock(); 191 while ((ep->e_flags & G_MIRROR_EVENT_DONE) == 0) { 192 mtx_lock(&sc->sc_events_mtx); 193 MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "m:event", 194 hz * 5); 195 } 196 /* Don't even try to use 'sc' here, because it could be already dead. */ 197 g_topology_lock(); 198 error = ep->e_error; 199 g_mirror_event_free(ep); 200 return (error); 201} 202 203static struct g_mirror_event * 204g_mirror_event_get(struct g_mirror_softc *sc) 205{ 206 struct g_mirror_event *ep; 207 208 mtx_lock(&sc->sc_events_mtx); 209 ep = TAILQ_FIRST(&sc->sc_events); 210 if (ep != NULL) 211 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 212 mtx_unlock(&sc->sc_events_mtx); 213 return (ep); 214} 215 216static void 217g_mirror_event_cancel(struct g_mirror_disk *disk) 218{ 219 struct g_mirror_softc *sc; 220 struct g_mirror_event *ep, *tmpep; 221 222 g_topology_assert(); 223 224 sc = disk->d_softc; 225 mtx_lock(&sc->sc_events_mtx); 226 TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) { 227 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) 228 continue; 229 if (ep->e_disk != disk) 230 continue; 231 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 232 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 233 g_mirror_event_free(ep); 234 else { 235 ep->e_error = ECANCELED; 236 wakeup(ep); 237 } 238 } 239 mtx_unlock(&sc->sc_events_mtx); 240} 241 242/* 243 * Return the number of disks in given state. 244 * If state is equal to -1, count all connected disks. 245 */ 246u_int 247g_mirror_ndisks(struct g_mirror_softc *sc, int state) 248{ 249 struct g_mirror_disk *disk; 250 u_int n = 0; 251 252 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 253 if (state == -1 || disk->d_state == state) 254 n++; 255 } 256 return (n); 257} 258 259/* 260 * Find a disk in mirror by its disk ID. 261 */ 262static struct g_mirror_disk * 263g_mirror_id2disk(struct g_mirror_softc *sc, uint32_t id) 264{ 265 struct g_mirror_disk *disk; 266 267 g_topology_assert(); 268 269 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 270 if (disk->d_id == id) 271 return (disk); 272 } 273 return (NULL); 274} 275 276static u_int 277g_mirror_nrequests(struct g_mirror_softc *sc, struct g_consumer *cp) 278{ 279 struct bio *bp; 280 u_int nreqs = 0; 281 282 mtx_lock(&sc->sc_queue_mtx); 283 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) { 284 if (bp->bio_from == cp) 285 nreqs++; 286 } 287 mtx_unlock(&sc->sc_queue_mtx); 288 return (nreqs); 289} 290 291static void 292g_mirror_kill_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 293{ 294 295 g_topology_assert(); 296 297 cp->private = NULL; 298 if (cp->nstart != cp->nend) { 299 G_MIRROR_DEBUG(2, 300 "I/O requests for %s exist, can't destroy it now.", 301 cp->provider->name); 302 return; 303 } 304 if (g_mirror_nrequests(sc, cp) > 0) { 305 G_MIRROR_DEBUG(2, 306 "I/O requests for %s in queue, can't destroy it now.", 307 cp->provider->name); 308 return; 309 } 310 G_MIRROR_DEBUG(2, "Consumer %s destroyed.", cp->provider->name); 311 g_detach(cp); 312 g_destroy_consumer(cp); 313} 314 315static int 316g_mirror_connect_disk(struct g_mirror_disk *disk, struct g_provider *pp) 317{ 318 int error; 319 320 g_topology_assert(); 321 KASSERT(disk->d_consumer == NULL, 322 ("Disk already connected (device %s).", disk->d_softc->sc_name)); 323 324 disk->d_consumer = g_new_consumer(disk->d_softc->sc_geom); 325 disk->d_consumer->private = disk; 326 error = g_attach(disk->d_consumer, pp); 327 if (error != 0) 328 return (error); 329 G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk)); 330 return (0); 331} 332 333static void 334g_mirror_disconnect_disk(struct g_mirror_disk *disk) 335{ 336 struct g_consumer *cp; 337 338 g_topology_assert(); 339 340 cp = disk->d_consumer; 341 if (cp == NULL) 342 return; 343 if (cp->provider != NULL) { 344 G_MIRROR_DEBUG(2, "Disk %s disconnected.", 345 g_mirror_get_diskname(disk)); 346 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) { 347 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", 348 cp->provider->name, -cp->acr, -cp->acw, -cp->ace, 349 0); 350 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 351 } 352 g_mirror_kill_consumer(disk->d_softc, cp); 353 } else { 354 g_destroy_consumer(cp); 355 } 356} 357 358/* 359 * Initialize disk. This means allocate memory, create consumer, attach it 360 * to the provider and open access (r1w1e1) to it. 361 */ 362static struct g_mirror_disk * 363g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp, 364 struct g_mirror_metadata *md, int *errorp) 365{ 366 struct g_mirror_disk *disk; 367 int error; 368 369 disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO); 370 if (disk == NULL) { 371 error = ENOMEM; 372 goto fail; 373 } 374 disk->d_softc = sc; 375 error = g_mirror_connect_disk(disk, pp); 376 if (error != 0) 377 goto fail; 378 disk->d_id = md->md_did; 379 disk->d_state = G_MIRROR_DISK_STATE_NONE; 380 disk->d_priority = md->md_priority; 381 disk->d_delay.sec = 0; 382 disk->d_delay.frac = 0; 383 binuptime(&disk->d_last_used); 384 disk->d_flags = md->md_dflags; 385 if (md->md_provider[0] != '\0') 386 disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED; 387 disk->d_sync.ds_consumer = NULL; 388 disk->d_sync.ds_offset = md->md_sync_offset; 389 disk->d_sync.ds_offset_done = md->md_sync_offset; 390 disk->d_sync.ds_syncid = md->md_syncid; 391 if (errorp != NULL) 392 *errorp = 0; 393 return (disk); 394fail: 395 if (errorp != NULL) 396 *errorp = error; 397 if (disk != NULL) { 398 g_mirror_disconnect_disk(disk); 399 free(disk, M_MIRROR); 400 } 401 return (NULL); 402} 403 404static void 405g_mirror_destroy_disk(struct g_mirror_disk *disk) 406{ 407 struct g_mirror_softc *sc; 408 409 g_topology_assert(); 410 411 LIST_REMOVE(disk, d_next); 412 g_mirror_event_cancel(disk); 413 sc = disk->d_softc; 414 if (sc->sc_hint == disk) 415 sc->sc_hint = NULL; 416 switch (disk->d_state) { 417 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 418 g_mirror_sync_stop(disk, 1); 419 /* FALLTHROUGH */ 420 case G_MIRROR_DISK_STATE_NEW: 421 case G_MIRROR_DISK_STATE_STALE: 422 case G_MIRROR_DISK_STATE_ACTIVE: 423 g_mirror_disconnect_disk(disk); 424 free(disk, M_MIRROR); 425 break; 426 default: 427 KASSERT(0 == 1, ("Wrong disk state (%s, %s).", 428 g_mirror_get_diskname(disk), 429 g_mirror_disk_state2str(disk->d_state))); 430 } 431} 432 433static void 434g_mirror_destroy_device(struct g_mirror_softc *sc) 435{ 436 struct g_mirror_disk *disk; 437 struct g_mirror_event *ep; 438 struct g_geom *gp; 439 struct g_consumer *cp; 440 441 g_topology_assert(); 442 443 gp = sc->sc_geom; 444 if (sc->sc_provider != NULL) 445 g_mirror_destroy_provider(sc); 446 for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL; 447 disk = LIST_FIRST(&sc->sc_disks)) { 448 g_mirror_destroy_disk(disk); 449 } 450 while ((ep = g_mirror_event_get(sc)) != NULL) { 451 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 452 g_mirror_event_free(ep); 453 else { 454 ep->e_error = ECANCELED; 455 ep->e_flags |= G_MIRROR_EVENT_DONE; 456 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep); 457 mtx_lock(&sc->sc_events_mtx); 458 wakeup(ep); 459 mtx_unlock(&sc->sc_events_mtx); 460 } 461 } 462 callout_drain(&sc->sc_callout); 463 gp->softc = NULL; 464 uma_zdestroy(sc->sc_sync.ds_zone); 465 while ((cp = LIST_FIRST(&sc->sc_sync.ds_geom->consumer)) != NULL) { 466 if (cp->provider != NULL) { 467 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 468 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 469 g_detach(cp); 470 } 471 g_destroy_consumer(cp); 472 } 473 sc->sc_sync.ds_geom->softc = NULL; 474 g_destroy_geom(sc->sc_sync.ds_geom); 475 mtx_destroy(&sc->sc_queue_mtx); 476 mtx_destroy(&sc->sc_events_mtx); 477 G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name); 478 g_wither_geom(gp, ENXIO); 479} 480 481static void 482g_mirror_orphan(struct g_consumer *cp) 483{ 484 struct g_mirror_disk *disk; 485 486 g_topology_assert(); 487 488 disk = cp->private; 489 if (disk == NULL) 490 return; 491 disk->d_softc->sc_bump_syncid = G_MIRROR_BUMP_ON_FIRST_WRITE; 492 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 493 G_MIRROR_EVENT_DONTWAIT); 494} 495 496static void 497g_mirror_spoiled(struct g_consumer *cp) 498{ 499 struct g_mirror_disk *disk; 500 501 g_topology_assert(); 502 503 disk = cp->private; 504 if (disk == NULL) 505 return; 506 disk->d_softc->sc_bump_syncid = G_MIRROR_BUMP_IMMEDIATELY; 507 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 508 G_MIRROR_EVENT_DONTWAIT); 509} 510 511/* 512 * Function should return the next active disk on the list. 513 * It is possible that it will be the same disk as given. 514 * If there are no active disks on list, NULL is returned. 515 */ 516static __inline struct g_mirror_disk * 517g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 518{ 519 struct g_mirror_disk *dp; 520 521 for (dp = LIST_NEXT(disk, d_next); dp != disk; 522 dp = LIST_NEXT(dp, d_next)) { 523 if (dp == NULL) 524 dp = LIST_FIRST(&sc->sc_disks); 525 if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE) 526 break; 527 } 528 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 529 return (NULL); 530 return (dp); 531} 532 533static struct g_mirror_disk * 534g_mirror_get_disk(struct g_mirror_softc *sc) 535{ 536 struct g_mirror_disk *disk; 537 538 if (sc->sc_hint == NULL) { 539 sc->sc_hint = LIST_FIRST(&sc->sc_disks); 540 if (sc->sc_hint == NULL) 541 return (NULL); 542 } 543 disk = sc->sc_hint; 544 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) { 545 disk = g_mirror_find_next(sc, disk); 546 if (disk == NULL) 547 return (NULL); 548 } 549 sc->sc_hint = g_mirror_find_next(sc, disk); 550 return (disk); 551} 552 553static int 554g_mirror_clear_metadata(struct g_mirror_disk *disk) 555{ 556 struct g_mirror_softc *sc; 557 struct g_consumer *cp; 558 off_t offset, length; 559 u_char *sector; 560 int close = 0, error = 0; 561 562 g_topology_assert(); 563 564 sc = disk->d_softc; 565 cp = disk->d_consumer; 566 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name)); 567 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name)); 568 length = cp->provider->sectorsize; 569 offset = cp->provider->mediasize - length; 570 sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO); 571 /* 572 * Open consumer if it wasn't opened and remember to close it. 573 */ 574 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) { 575 error = g_access(cp, 0, 1, 1); 576 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", 577 cp->provider->name, 0, 1, 1, error); 578 if (error == 0) 579 close = 1; 580#ifdef INVARIANTS 581 } else { 582 KASSERT(cp->acw > 0 && cp->ace > 0, 583 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 584 cp->acr, cp->acw, cp->ace)); 585#endif 586 } 587 if (error == 0) { 588 g_topology_unlock(); 589 error = g_write_data(cp, offset, sector, length); 590 g_topology_lock(); 591 } 592 free(sector, M_MIRROR); 593 if (close) { 594 g_access(cp, 0, -1, -1); 595 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", 596 cp->provider->name, 0, -1, -1, 0); 597 } 598 if (error != 0) { 599 G_MIRROR_DEBUG(0, "Cannot clear metadata on disk %s.", 600 g_mirror_get_diskname(disk)); 601 disk->d_softc->sc_bump_syncid = G_MIRROR_BUMP_IMMEDIATELY; 602 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 603 G_MIRROR_EVENT_DONTWAIT); 604 return (error); 605 } 606 G_MIRROR_DEBUG(2, "Metadata on %s cleared.", 607 g_mirror_get_diskname(disk)); 608 return (0); 609} 610 611void 612g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk, 613 struct g_mirror_metadata *md) 614{ 615 616 strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic)); 617 md->md_version = G_MIRROR_VERSION; 618 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name)); 619 md->md_mid = sc->sc_id; 620 md->md_all = sc->sc_ndisks; 621 md->md_slice = sc->sc_slice; 622 md->md_balance = sc->sc_balance; 623 md->md_mediasize = sc->sc_mediasize; 624 md->md_sectorsize = sc->sc_sectorsize; 625 md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK); 626 bzero(md->md_provider, sizeof(md->md_provider)); 627 if (disk == NULL) { 628 md->md_did = arc4random(); 629 md->md_priority = 0; 630 md->md_syncid = 0; 631 md->md_dflags = 0; 632 md->md_sync_offset = 0; 633 } else { 634 md->md_did = disk->d_id; 635 md->md_priority = disk->d_priority; 636 md->md_syncid = disk->d_sync.ds_syncid; 637 md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK); 638 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 639 md->md_sync_offset = disk->d_sync.ds_offset_done; 640 else 641 md->md_sync_offset = 0; 642 if ((disk->d_flags & G_MIRROR_DISK_FLAG_HARDCODED) != 0) { 643 strlcpy(md->md_provider, 644 disk->d_consumer->provider->name, 645 sizeof(md->md_provider)); 646 } 647 } 648} 649 650void 651g_mirror_update_metadata(struct g_mirror_disk *disk) 652{ 653 struct g_mirror_softc *sc; 654 struct g_mirror_metadata md; 655 struct g_consumer *cp; 656 off_t offset, length; 657 u_char *sector; 658 int close = 0, error = 0; 659 660 g_topology_assert(); 661 662 sc = disk->d_softc; 663 cp = disk->d_consumer; 664 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name)); 665 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name)); 666 length = cp->provider->sectorsize; 667 offset = cp->provider->mediasize - length; 668 sector = malloc((size_t)length, M_MIRROR, M_WAITOK); 669 /* 670 * Open consumer if it wasn't opened and remember to close it. 671 */ 672 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) { 673 error = g_access(cp, 0, 1, 1); 674 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", 675 cp->provider->name, 0, 1, 1, error); 676 if (error == 0) 677 close = 1; 678#ifdef INVARIANTS 679 } else { 680 KASSERT(cp->acw > 0 && cp->ace > 0, 681 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 682 cp->acr, cp->acw, cp->ace)); 683#endif 684 } 685 if (error == 0) { 686 g_mirror_fill_metadata(sc, disk, &md); 687 mirror_metadata_encode(&md, sector); 688 g_topology_unlock(); 689 error = g_write_data(cp, offset, sector, length); 690 g_topology_lock(); 691 } 692 free(sector, M_MIRROR); 693 if (close) { 694 g_access(cp, 0, -1, -1); 695 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", 696 cp->provider->name, 0, -1, -1, 0); 697 } 698 if (error != 0) { 699 G_MIRROR_DEBUG(0, 700 "Cannot update metadata on disk %s (error=%d).", 701 g_mirror_get_diskname(disk), error); 702 disk->d_softc->sc_bump_syncid = G_MIRROR_BUMP_IMMEDIATELY; 703 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 704 G_MIRROR_EVENT_DONTWAIT); 705 return; 706 } 707 G_MIRROR_DEBUG(2, "Metadata on %s updated.", 708 g_mirror_get_diskname(disk)); 709} 710 711static void 712g_mirror_bump_syncid(struct g_mirror_softc *sc) 713{ 714 struct g_mirror_disk *disk; 715 716 g_topology_assert(); 717 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 718 ("%s called with no active disks (device=%s).", __func__, 719 sc->sc_name)); 720 721 sc->sc_syncid++; 722 G_MIRROR_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name, 723 sc->sc_syncid); 724 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 725 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 726 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 727 disk->d_sync.ds_syncid = sc->sc_syncid; 728 g_mirror_update_metadata(disk); 729 } 730 } 731} 732 733static __inline int 734bintime_cmp(struct bintime *bt1, struct bintime *bt2) 735{ 736 737 if (bt1->sec < bt2->sec) 738 return (-1); 739 else if (bt1->sec > bt2->sec) 740 return (1); 741 if (bt1->frac < bt2->frac) 742 return (-1); 743 else if (bt1->frac > bt2->frac) 744 return (1); 745 return (0); 746} 747 748static void 749g_mirror_update_delay(struct g_mirror_disk *disk, struct bio *bp) 750{ 751 752 if (disk->d_softc->sc_balance != G_MIRROR_BALANCE_LOAD) 753 return; 754 binuptime(&disk->d_delay); 755 bintime_sub(&disk->d_delay, &bp->bio_t0); 756} 757 758static void 759g_mirror_done(struct bio *bp) 760{ 761 struct g_mirror_softc *sc; 762 763 sc = bp->bio_from->geom->softc; 764 bp->bio_cflags |= G_MIRROR_BIO_FLAG_REGULAR; 765 mtx_lock(&sc->sc_queue_mtx); 766 bioq_disksort(&sc->sc_queue, bp); 767 wakeup(sc); 768 mtx_unlock(&sc->sc_queue_mtx); 769} 770 771static void 772g_mirror_regular_request(struct bio *bp) 773{ 774 struct g_mirror_softc *sc; 775 struct g_mirror_disk *disk; 776 struct bio *pbp; 777 778 g_topology_assert_not(); 779 780 pbp = bp->bio_parent; 781 sc = pbp->bio_to->geom->softc; 782 disk = bp->bio_from->private; 783 if (disk == NULL) { 784 g_topology_lock(); 785 g_mirror_kill_consumer(sc, bp->bio_from); 786 g_topology_unlock(); 787 } else { 788 g_mirror_update_delay(disk, bp); 789 } 790 791 pbp->bio_inbed++; 792 KASSERT(pbp->bio_inbed <= pbp->bio_children, 793 ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed, 794 pbp->bio_children)); 795 if (bp->bio_error == 0 && pbp->bio_error == 0) { 796 G_MIRROR_LOGREQ(3, bp, "Request delivered."); 797 g_destroy_bio(bp); 798 if (pbp->bio_children == pbp->bio_inbed) { 799 G_MIRROR_LOGREQ(3, pbp, "Request delivered."); 800 pbp->bio_completed = pbp->bio_length; 801 g_io_deliver(pbp, pbp->bio_error); 802 } 803 return; 804 } else if (bp->bio_error != 0) { 805 if (pbp->bio_error == 0) 806 pbp->bio_error = bp->bio_error; 807 G_MIRROR_LOGREQ(0, bp, "Request failed (error=%d).", 808 bp->bio_error); 809 if (disk != NULL) { 810 sc->sc_bump_syncid = G_MIRROR_BUMP_IMMEDIATELY; 811 g_mirror_event_send(disk, 812 G_MIRROR_DISK_STATE_DISCONNECTED, 813 G_MIRROR_EVENT_DONTWAIT); 814 } 815 switch (pbp->bio_cmd) { 816 case BIO_DELETE: 817 case BIO_WRITE: 818 pbp->bio_inbed--; 819 pbp->bio_children--; 820 break; 821 } 822 } 823 g_destroy_bio(bp); 824 825 switch (pbp->bio_cmd) { 826 case BIO_READ: 827 if (pbp->bio_children == pbp->bio_inbed) { 828 pbp->bio_error = 0; 829 mtx_lock(&sc->sc_queue_mtx); 830 bioq_disksort(&sc->sc_queue, pbp); 831 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 832 wakeup(sc); 833 mtx_unlock(&sc->sc_queue_mtx); 834 } 835 break; 836 case BIO_DELETE: 837 case BIO_WRITE: 838 if (pbp->bio_children == 0) { 839 /* 840 * All requests failed. 841 */ 842 } else if (pbp->bio_inbed < pbp->bio_children) { 843 /* Do nothing. */ 844 break; 845 } else if (pbp->bio_children == pbp->bio_inbed) { 846 /* Some requests succeeded. */ 847 pbp->bio_error = 0; 848 pbp->bio_completed = pbp->bio_length; 849 } 850 g_io_deliver(pbp, pbp->bio_error); 851 break; 852 default: 853 KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd)); 854 break; 855 } 856} 857 858static void 859g_mirror_sync_done(struct bio *bp) 860{ 861 struct g_mirror_softc *sc; 862 863 G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered."); 864 sc = bp->bio_from->geom->softc; 865 bp->bio_cflags |= G_MIRROR_BIO_FLAG_SYNC; 866 mtx_lock(&sc->sc_queue_mtx); 867 bioq_disksort(&sc->sc_queue, bp); 868 wakeup(sc); 869 mtx_unlock(&sc->sc_queue_mtx); 870} 871 872static void 873g_mirror_start(struct bio *bp) 874{ 875 struct g_mirror_softc *sc; 876 877 sc = bp->bio_to->geom->softc; 878 /* 879 * If sc == NULL or there are no valid disks, provider's error 880 * should be set and g_mirror_start() should not be called at all. 881 */ 882 KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 883 ("Provider's error should be set (error=%d)(mirror=%s).", 884 bp->bio_to->error, bp->bio_to->name)); 885 G_MIRROR_LOGREQ(3, bp, "Request received."); 886 887 switch (bp->bio_cmd) { 888 case BIO_READ: 889 case BIO_WRITE: 890 case BIO_DELETE: 891 break; 892 case BIO_GETATTR: 893 default: 894 g_io_deliver(bp, EOPNOTSUPP); 895 return; 896 } 897 mtx_lock(&sc->sc_queue_mtx); 898 bioq_disksort(&sc->sc_queue, bp); 899 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 900 wakeup(sc); 901 mtx_unlock(&sc->sc_queue_mtx); 902} 903 904/* 905 * Send one synchronization request. 906 */ 907static void 908g_mirror_sync_one(struct g_mirror_disk *disk) 909{ 910 struct g_mirror_softc *sc; 911 struct bio *bp; 912 913 sc = disk->d_softc; 914 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 915 ("Disk %s is not marked for synchronization.", 916 g_mirror_get_diskname(disk))); 917 918 bp = g_new_bio(); 919 if (bp == NULL) 920 return; 921 bp->bio_parent = NULL; 922 bp->bio_cmd = BIO_READ; 923 bp->bio_offset = disk->d_sync.ds_offset; 924 bp->bio_length = MIN(sc->sc_sync.ds_block, 925 sc->sc_mediasize - bp->bio_offset); 926 bp->bio_cflags = 0; 927 bp->bio_done = g_mirror_sync_done; 928 bp->bio_data = uma_zalloc(sc->sc_sync.ds_zone, M_NOWAIT | M_ZERO); 929 if (bp->bio_data == NULL) { 930 g_destroy_bio(bp); 931 return; 932 } 933 disk->d_sync.ds_offset += bp->bio_length; 934 bp->bio_to = sc->sc_provider; 935 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 936 g_io_request(bp, disk->d_sync.ds_consumer); 937} 938 939static void 940g_mirror_sync_request(struct bio *bp) 941{ 942 struct g_mirror_softc *sc; 943 struct g_mirror_disk *disk; 944 945 sc = bp->bio_from->geom->softc; 946 disk = bp->bio_from->private; 947 if (disk == NULL) { 948 g_topology_lock(); 949 g_mirror_kill_consumer(sc, bp->bio_from); 950 g_topology_unlock(); 951 uma_zfree(sc->sc_sync.ds_zone, bp->bio_data); 952 g_destroy_bio(bp); 953 return; 954 } 955 956 /* 957 * Synchronization request. 958 */ 959 switch (bp->bio_cmd) { 960 case BIO_READ: 961 { 962 struct g_consumer *cp; 963 964 if (bp->bio_error != 0) { 965 G_MIRROR_LOGREQ(0, bp, 966 "Synchronization request failed (error=%d).", 967 bp->bio_error); 968 uma_zfree(sc->sc_sync.ds_zone, bp->bio_data); 969 g_destroy_bio(bp); 970 return; 971 } 972 bp->bio_cmd = BIO_WRITE; 973 bp->bio_cflags = 0; 974 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished."); 975 cp = disk->d_consumer; 976 KASSERT(cp->acr == 0 && cp->acw == 1 && cp->ace == 1, 977 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 978 cp->acr, cp->acw, cp->ace)); 979 g_io_request(bp, cp); 980 return; 981 } 982 case BIO_WRITE: 983 uma_zfree(sc->sc_sync.ds_zone, bp->bio_data); 984 if (bp->bio_error != 0) { 985 G_MIRROR_LOGREQ(0, bp, 986 "Synchronization request failed (error=%d).", 987 bp->bio_error); 988 g_destroy_bio(bp); 989 sc->sc_bump_syncid = G_MIRROR_BUMP_IMMEDIATELY; 990 g_mirror_event_send(disk, 991 G_MIRROR_DISK_STATE_DISCONNECTED, 992 G_MIRROR_EVENT_DONTWAIT); 993 return; 994 } 995 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished."); 996 disk->d_sync.ds_offset_done = bp->bio_offset + bp->bio_length; 997 g_destroy_bio(bp); 998 if (disk->d_sync.ds_offset_done == sc->sc_provider->mediasize) { 999 /* 1000 * Disk up-to-date, activate it. 1001 */ 1002 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE, 1003 G_MIRROR_EVENT_DONTWAIT); 1004 return; 1005 } else if ((disk->d_sync.ds_offset_done % 1006 (sc->sc_sync.ds_block * 100)) == 0) { 1007 /* 1008 * Update offset_done on every 100 blocks. 1009 * XXX: This should be configurable. 1010 */ 1011 g_topology_lock(); 1012 g_mirror_update_metadata(disk); 1013 g_topology_unlock(); 1014 } 1015 return; 1016 default: 1017 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1018 bp->bio_cmd, sc->sc_name)); 1019 break; 1020 } 1021} 1022 1023static void 1024g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp) 1025{ 1026 struct g_mirror_disk *disk; 1027 struct g_consumer *cp; 1028 struct bio *cbp; 1029 1030 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1031 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE) 1032 break; 1033 } 1034 if (disk == NULL) { 1035 if (bp->bio_error == 0) 1036 bp->bio_error = ENXIO; 1037 g_io_deliver(bp, bp->bio_error); 1038 return; 1039 } 1040 cbp = g_clone_bio(bp); 1041 if (cbp == NULL) { 1042 if (bp->bio_error == 0) 1043 bp->bio_error = ENOMEM; 1044 g_io_deliver(bp, bp->bio_error); 1045 return; 1046 } 1047 /* 1048 * Fill in the component buf structure. 1049 */ 1050 cp = disk->d_consumer; 1051 cbp->bio_done = g_mirror_done; 1052 cbp->bio_to = cp->provider; 1053 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1054 KASSERT(cp->acr > 0 && cp->ace > 0, 1055 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1056 cp->acw, cp->ace)); 1057 g_io_request(cbp, cp); 1058} 1059 1060static void 1061g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp) 1062{ 1063 struct g_mirror_disk *disk; 1064 struct g_consumer *cp; 1065 struct bio *cbp; 1066 1067 disk = g_mirror_get_disk(sc); 1068 if (disk == NULL) { 1069 if (bp->bio_error == 0) 1070 bp->bio_error = ENXIO; 1071 g_io_deliver(bp, bp->bio_error); 1072 return; 1073 } 1074 cbp = g_clone_bio(bp); 1075 if (cbp == NULL) { 1076 if (bp->bio_error == 0) 1077 bp->bio_error = ENOMEM; 1078 g_io_deliver(bp, bp->bio_error); 1079 return; 1080 } 1081 /* 1082 * Fill in the component buf structure. 1083 */ 1084 cp = disk->d_consumer; 1085 cbp->bio_done = g_mirror_done; 1086 cbp->bio_to = cp->provider; 1087 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1088 KASSERT(cp->acr > 0 && cp->ace > 0, 1089 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1090 cp->acw, cp->ace)); 1091 g_io_request(cbp, cp); 1092} 1093 1094static void 1095g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp) 1096{ 1097 struct g_mirror_disk *disk, *dp; 1098 struct g_consumer *cp; 1099 struct bio *cbp; 1100 struct bintime curtime; 1101 1102 binuptime(&curtime); 1103 /* 1104 * Find a disk which the smallest load. 1105 */ 1106 disk = NULL; 1107 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1108 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1109 continue; 1110 /* If disk wasn't used for more than 2 sec, use it. */ 1111 if (curtime.sec - dp->d_last_used.sec >= 2) { 1112 disk = dp; 1113 break; 1114 } 1115 if (disk == NULL || 1116 bintime_cmp(&dp->d_delay, &disk->d_delay) < 0) { 1117 disk = dp; 1118 } 1119 } 1120 cbp = g_clone_bio(bp); 1121 if (cbp == NULL) { 1122 if (bp->bio_error == 0) 1123 bp->bio_error = ENOMEM; 1124 g_io_deliver(bp, bp->bio_error); 1125 return; 1126 } 1127 /* 1128 * Fill in the component buf structure. 1129 */ 1130 cp = disk->d_consumer; 1131 cbp->bio_done = g_mirror_done; 1132 cbp->bio_to = cp->provider; 1133 binuptime(&disk->d_last_used); 1134 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1135 KASSERT(cp->acr > 0 && cp->ace > 0, 1136 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1137 cp->acw, cp->ace)); 1138 g_io_request(cbp, cp); 1139} 1140 1141static void 1142g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp) 1143{ 1144 struct bio_queue_head queue; 1145 struct g_mirror_disk *disk; 1146 struct g_consumer *cp; 1147 struct bio *cbp; 1148 off_t left, mod, offset, slice; 1149 u_char *data; 1150 u_int ndisks; 1151 1152 if (bp->bio_length <= sc->sc_slice) { 1153 g_mirror_request_round_robin(sc, bp); 1154 return; 1155 } 1156 ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE); 1157 slice = bp->bio_length / ndisks; 1158 mod = slice % sc->sc_provider->sectorsize; 1159 if (mod != 0) 1160 slice += sc->sc_provider->sectorsize - mod; 1161 /* 1162 * Allocate all bios before sending any request, so we can 1163 * return ENOMEM in nice and clean way. 1164 */ 1165 left = bp->bio_length; 1166 offset = bp->bio_offset; 1167 data = bp->bio_data; 1168 bioq_init(&queue); 1169 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1170 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1171 continue; 1172 cbp = g_clone_bio(bp); 1173 if (cbp == NULL) { 1174 for (cbp = bioq_first(&queue); cbp != NULL; 1175 cbp = bioq_first(&queue)) { 1176 bioq_remove(&queue, cbp); 1177 g_destroy_bio(cbp); 1178 } 1179 if (bp->bio_error == 0) 1180 bp->bio_error = ENOMEM; 1181 g_io_deliver(bp, bp->bio_error); 1182 return; 1183 } 1184 bioq_insert_tail(&queue, cbp); 1185 cbp->bio_done = g_mirror_done; 1186 cbp->bio_caller1 = disk; 1187 cbp->bio_to = disk->d_consumer->provider; 1188 cbp->bio_offset = offset; 1189 cbp->bio_data = data; 1190 cbp->bio_length = MIN(left, slice); 1191 left -= cbp->bio_length; 1192 if (left == 0) 1193 break; 1194 offset += cbp->bio_length; 1195 data += cbp->bio_length; 1196 } 1197 for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) { 1198 bioq_remove(&queue, cbp); 1199 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1200 disk = cbp->bio_caller1; 1201 cbp->bio_caller1 = NULL; 1202 cp = disk->d_consumer; 1203 KASSERT(cp->acr > 0 && cp->ace > 0, 1204 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1205 cp->acr, cp->acw, cp->ace)); 1206 g_io_request(cbp, disk->d_consumer); 1207 } 1208} 1209 1210static void 1211g_mirror_register_request(struct bio *bp) 1212{ 1213 struct g_mirror_softc *sc; 1214 1215 sc = bp->bio_to->geom->softc; 1216 switch (bp->bio_cmd) { 1217 case BIO_READ: 1218 switch (sc->sc_balance) { 1219 case G_MIRROR_BALANCE_LOAD: 1220 g_mirror_request_load(sc, bp); 1221 break; 1222 case G_MIRROR_BALANCE_PREFER: 1223 g_mirror_request_prefer(sc, bp); 1224 break; 1225 case G_MIRROR_BALANCE_ROUND_ROBIN: 1226 g_mirror_request_round_robin(sc, bp); 1227 break; 1228 case G_MIRROR_BALANCE_SPLIT: 1229 g_mirror_request_split(sc, bp); 1230 break; 1231 } 1232 return; 1233 case BIO_WRITE: 1234 case BIO_DELETE: 1235 { 1236 struct g_mirror_disk *disk; 1237 struct bio_queue_head queue; 1238 struct g_consumer *cp; 1239 struct bio *cbp; 1240 1241 /* 1242 * Allocate all bios before sending any request, so we can 1243 * return ENOMEM in nice and clean way. 1244 */ 1245 bioq_init(&queue); 1246 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1247 switch (disk->d_state) { 1248 case G_MIRROR_DISK_STATE_ACTIVE: 1249 break; 1250 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 1251 if (bp->bio_offset >= disk->d_sync.ds_offset) 1252 continue; 1253 break; 1254 default: 1255 continue; 1256 } 1257 cbp = g_clone_bio(bp); 1258 if (cbp == NULL) { 1259 for (cbp = bioq_first(&queue); cbp != NULL; 1260 cbp = bioq_first(&queue)) { 1261 bioq_remove(&queue, cbp); 1262 g_destroy_bio(cbp); 1263 } 1264 if (bp->bio_error == 0) 1265 bp->bio_error = ENOMEM; 1266 g_io_deliver(bp, bp->bio_error); 1267 return; 1268 } 1269 bioq_insert_tail(&queue, cbp); 1270 } 1271 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1272 switch (disk->d_state) { 1273 case G_MIRROR_DISK_STATE_ACTIVE: 1274 break; 1275 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 1276 if (bp->bio_offset >= disk->d_sync.ds_offset) 1277 continue; 1278 break; 1279 default: 1280 continue; 1281 } 1282 cbp = bioq_first(&queue); 1283 KASSERT(cbp != NULL, ("NULL cbp! (device %s).", 1284 sc->sc_name)); 1285 bioq_remove(&queue, cbp); 1286 cp = disk->d_consumer; 1287 cbp->bio_done = g_mirror_done; 1288 cbp->bio_to = cp->provider; 1289 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1290 KASSERT(cp->acw > 0 && cp->ace > 0, 1291 ("Consumer %s not opened (r%dw%de%d).", 1292 cp->provider->name, cp->acr, cp->acw, cp->ace)); 1293 g_io_request(cbp, cp); 1294 } 1295 /* 1296 * Bump syncid on first write. 1297 */ 1298 if (sc->sc_bump_syncid == G_MIRROR_BUMP_ON_FIRST_WRITE) { 1299 sc->sc_bump_syncid = 0; 1300 g_topology_lock(); 1301 g_mirror_bump_syncid(sc); 1302 g_topology_unlock(); 1303 } 1304 return; 1305 } 1306 default: 1307 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1308 bp->bio_cmd, sc->sc_name)); 1309 break; 1310 } 1311} 1312 1313/* 1314 * Worker thread. 1315 */ 1316static void 1317g_mirror_worker(void *arg) 1318{ 1319 struct g_mirror_softc *sc; 1320 struct g_mirror_disk *disk; 1321 struct g_mirror_event *ep; 1322 struct bio *bp; 1323 u_int nreqs; 1324 1325 sc = arg; 1326 curthread->td_base_pri = PRIBIO; 1327 1328 nreqs = 0; 1329 for (;;) { 1330 G_MIRROR_DEBUG(5, "%s: Let's see...", __func__); 1331 /* 1332 * First take a look at events. 1333 * This is important to handle events before any I/O requests. 1334 */ 1335 ep = g_mirror_event_get(sc); 1336 if (ep != NULL) { 1337 g_topology_lock(); 1338 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) { 1339 /* Update only device status. */ 1340 G_MIRROR_DEBUG(3, 1341 "Running event for device %s.", 1342 sc->sc_name); 1343 ep->e_error = 0; 1344 g_mirror_update_device(sc, 1); 1345 } else { 1346 /* Update disk status. */ 1347 G_MIRROR_DEBUG(3, "Running event for disk %s.", 1348 g_mirror_get_diskname(ep->e_disk)); 1349 ep->e_error = g_mirror_update_disk(ep->e_disk, 1350 ep->e_state); 1351 if (ep->e_error == 0) 1352 g_mirror_update_device(sc, 0); 1353 } 1354 g_topology_unlock(); 1355 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) { 1356 KASSERT(ep->e_error == 0, 1357 ("Error cannot be handled.")); 1358 g_mirror_event_free(ep); 1359 } else { 1360 ep->e_flags |= G_MIRROR_EVENT_DONE; 1361 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1362 ep); 1363 mtx_lock(&sc->sc_events_mtx); 1364 wakeup(ep); 1365 mtx_unlock(&sc->sc_events_mtx); 1366 } 1367 if ((sc->sc_flags & 1368 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1369end: 1370 if ((sc->sc_flags & 1371 G_MIRROR_DEVICE_FLAG_WAIT) != 0) { 1372 G_MIRROR_DEBUG(4, "%s: Waking up %p.", 1373 __func__, &sc->sc_worker); 1374 wakeup(&sc->sc_worker); 1375 sc->sc_worker = NULL; 1376 } else { 1377 g_topology_lock(); 1378 g_mirror_destroy_device(sc); 1379 g_topology_unlock(); 1380 free(sc, M_MIRROR); 1381 } 1382 kthread_exit(0); 1383 } 1384 G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__); 1385 continue; 1386 } 1387 /* 1388 * Now I/O requests. 1389 */ 1390 /* Get first request from the queue. */ 1391 mtx_lock(&sc->sc_queue_mtx); 1392 bp = bioq_first(&sc->sc_queue); 1393 if (bp == NULL) { 1394 if ((sc->sc_flags & 1395 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1396 mtx_unlock(&sc->sc_queue_mtx); 1397 goto end; 1398 } 1399 } 1400 if (sc->sc_sync.ds_ndisks > 0 && 1401 (bp == NULL || nreqs > g_mirror_reqs_per_sync)) { 1402 mtx_unlock(&sc->sc_queue_mtx); 1403 /* 1404 * It is time for synchronization... 1405 */ 1406 nreqs = 0; 1407 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1408 if (disk->d_state != 1409 G_MIRROR_DISK_STATE_SYNCHRONIZING) { 1410 continue; 1411 } 1412 if (disk->d_sync.ds_offset >= 1413 sc->sc_provider->mediasize) { 1414 continue; 1415 } 1416 if (disk->d_sync.ds_offset > 1417 disk->d_sync.ds_offset_done) { 1418 continue; 1419 } 1420 g_mirror_sync_one(disk); 1421 } 1422 G_MIRROR_DEBUG(5, "%s: I'm here 2.", __func__); 1423 goto sleep; 1424 } 1425 if (bp == NULL) { 1426 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w1", 0); 1427 G_MIRROR_DEBUG(5, "%s: I'm here 3.", __func__); 1428 continue; 1429 } 1430 nreqs++; 1431 bioq_remove(&sc->sc_queue, bp); 1432 mtx_unlock(&sc->sc_queue_mtx); 1433 1434 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0) { 1435 g_mirror_regular_request(bp); 1436 } else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) { 1437 u_int timeout, sps; 1438 1439 g_mirror_sync_request(bp); 1440sleep: 1441 sps = atomic_load_acq_int(&g_mirror_syncs_per_sec); 1442 if (sps == 0) { 1443 G_MIRROR_DEBUG(5, "%s: I'm here 5.", __func__); 1444 continue; 1445 } 1446 mtx_lock(&sc->sc_queue_mtx); 1447 if (bioq_first(&sc->sc_queue) != NULL) { 1448 mtx_unlock(&sc->sc_queue_mtx); 1449 G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__); 1450 continue; 1451 } 1452 timeout = hz / sps; 1453 if (timeout == 0) 1454 timeout = 1; 1455 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w2", 1456 timeout); 1457 } else { 1458 g_mirror_register_request(bp); 1459 } 1460 G_MIRROR_DEBUG(5, "%s: I'm here 6.", __func__); 1461 } 1462} 1463 1464/* 1465 * Open disk's consumer if needed. 1466 */ 1467static void 1468g_mirror_update_access(struct g_mirror_disk *disk) 1469{ 1470 struct g_provider *pp; 1471 struct g_consumer *cp; 1472 int acr, acw, ace, cpw, error; 1473 1474 g_topology_assert(); 1475 1476 cp = disk->d_consumer; 1477 pp = disk->d_softc->sc_provider; 1478 if (pp == NULL) { 1479 acr = -cp->acr; 1480 acw = -cp->acw; 1481 ace = -cp->ace; 1482 } else { 1483 acr = pp->acr - cp->acr; 1484 acw = pp->acw - cp->acw; 1485 ace = pp->ace - cp->ace; 1486 /* Grab an extra "exclusive" bit. */ 1487 if (pp->acr > 0 || pp->acw > 0 || pp->ace > 0) 1488 ace++; 1489 } 1490 if (acr == 0 && acw == 0 && ace == 0) 1491 return; 1492 cpw = cp->acw; 1493 error = g_access(cp, acr, acw, ace); 1494 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", cp->provider->name, acr, 1495 acw, ace, error); 1496 if (error != 0) { 1497 disk->d_softc->sc_bump_syncid = G_MIRROR_BUMP_ON_FIRST_WRITE; 1498 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 1499 G_MIRROR_EVENT_DONTWAIT); 1500 return; 1501 } 1502 if (cpw == 0 && cp->acw > 0) { 1503 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.", 1504 g_mirror_get_diskname(disk), disk->d_softc->sc_name); 1505 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1506 } else if (cpw > 0 && cp->acw == 0) { 1507 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.", 1508 g_mirror_get_diskname(disk), disk->d_softc->sc_name); 1509 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 1510 } 1511} 1512 1513static void 1514g_mirror_sync_start(struct g_mirror_disk *disk) 1515{ 1516 struct g_mirror_softc *sc; 1517 struct g_consumer *cp; 1518 int error; 1519 1520 g_topology_assert(); 1521 1522 sc = disk->d_softc; 1523 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1524 ("Device not in RUNNING state (%s, %u).", sc->sc_name, 1525 sc->sc_state)); 1526 cp = disk->d_consumer; 1527 KASSERT(cp->acr == 0 && cp->acw == 0 && cp->ace == 0, 1528 ("Consumer %s already opened.", cp->provider->name)); 1529 1530 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name, 1531 g_mirror_get_diskname(disk)); 1532 error = g_access(cp, 0, 1, 1); 1533 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", cp->provider->name, 0, 1, 1534 1, error); 1535 if (error != 0) { 1536 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 1537 G_MIRROR_EVENT_DONTWAIT); 1538 return; 1539 } 1540 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1541 KASSERT(disk->d_sync.ds_consumer == NULL, 1542 ("Sync consumer already exists (device=%s, disk=%s).", 1543 sc->sc_name, g_mirror_get_diskname(disk))); 1544 disk->d_sync.ds_consumer = g_new_consumer(sc->sc_sync.ds_geom); 1545 disk->d_sync.ds_consumer->private = disk; 1546 error = g_attach(disk->d_sync.ds_consumer, disk->d_softc->sc_provider); 1547 KASSERT(error == 0, ("Cannot attach to %s (error=%d).", 1548 disk->d_softc->sc_name, error)); 1549 error = g_access(disk->d_sync.ds_consumer, 1, 0, 0); 1550 KASSERT(error == 0, ("Cannot open %s (error=%d).", 1551 disk->d_softc->sc_name, error)); 1552 sc->sc_sync.ds_ndisks++; 1553} 1554 1555/* 1556 * Stop synchronization process. 1557 * type: 0 - synchronization finished 1558 * 1 - synchronization stopped 1559 */ 1560static void 1561g_mirror_sync_stop(struct g_mirror_disk *disk, int type) 1562{ 1563 struct g_consumer *cp; 1564 1565 g_topology_assert(); 1566 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 1567 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 1568 g_mirror_disk_state2str(disk->d_state))); 1569 if (disk->d_sync.ds_consumer == NULL) 1570 return; 1571 1572 if (type == 0) { 1573 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.", 1574 disk->d_softc->sc_name, g_mirror_get_diskname(disk)); 1575 } else /* if (type == 1) */ { 1576 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.", 1577 disk->d_softc->sc_name, g_mirror_get_diskname(disk)); 1578 } 1579 cp = disk->d_sync.ds_consumer; 1580 g_access(cp, -1, 0, 0); 1581 g_mirror_kill_consumer(disk->d_softc, cp); 1582 disk->d_sync.ds_consumer = NULL; 1583 disk->d_softc->sc_sync.ds_ndisks--; 1584 cp = disk->d_consumer; 1585 KASSERT(cp->acr == 0 && cp->acw == 1 && cp->ace == 1, 1586 ("Consumer %s not opened.", cp->provider->name)); 1587 g_access(cp, 0, -1, -1); 1588 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", cp->provider->name, 0, -1, 1589 -1, 0); 1590 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 1591} 1592 1593static void 1594g_mirror_launch_provider(struct g_mirror_softc *sc) 1595{ 1596 struct g_mirror_disk *disk; 1597 struct g_provider *pp; 1598 1599 g_topology_assert(); 1600 1601 pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name); 1602 pp->mediasize = sc->sc_mediasize; 1603 pp->sectorsize = sc->sc_sectorsize; 1604 sc->sc_provider = pp; 1605 g_error_provider(pp, 0); 1606 G_MIRROR_DEBUG(0, "Device %s: provider %s launched.", sc->sc_name, 1607 pp->name); 1608 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1609 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 1610 g_mirror_sync_start(disk); 1611 } 1612} 1613 1614static void 1615g_mirror_destroy_provider(struct g_mirror_softc *sc) 1616{ 1617 struct g_mirror_disk *disk; 1618 struct bio *bp; 1619 1620 g_topology_assert(); 1621 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).", 1622 sc->sc_name)); 1623 1624 g_error_provider(sc->sc_provider, ENXIO); 1625 mtx_lock(&sc->sc_queue_mtx); 1626 while ((bp = bioq_first(&sc->sc_queue)) != NULL) { 1627 bioq_remove(&sc->sc_queue, bp); 1628 g_io_deliver(bp, ENXIO); 1629 } 1630 mtx_unlock(&sc->sc_queue_mtx); 1631 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", sc->sc_name, 1632 sc->sc_provider->name); 1633 sc->sc_provider->flags |= G_PF_WITHER; 1634 g_orphan_provider(sc->sc_provider, ENXIO); 1635 sc->sc_provider = NULL; 1636 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1637 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 1638 g_mirror_sync_stop(disk, 1); 1639 } 1640} 1641 1642static void 1643g_mirror_go(void *arg) 1644{ 1645 struct g_mirror_softc *sc; 1646 1647 sc = arg; 1648 G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name); 1649 g_mirror_event_send(sc, 0, 1650 G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE); 1651} 1652 1653static u_int 1654g_mirror_determine_state(struct g_mirror_disk *disk) 1655{ 1656 struct g_mirror_softc *sc; 1657 u_int state; 1658 1659 sc = disk->d_softc; 1660 if (sc->sc_syncid == disk->d_sync.ds_syncid) { 1661 if ((disk->d_flags & 1662 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 1663 /* Disk does not need synchronization. */ 1664 state = G_MIRROR_DISK_STATE_ACTIVE; 1665 } else { 1666 if ((sc->sc_flags & 1667 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 1668 (disk->d_flags & 1669 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 1670 /* 1671 * We can start synchronization from 1672 * the stored offset. 1673 */ 1674 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 1675 } else { 1676 state = G_MIRROR_DISK_STATE_STALE; 1677 } 1678 } 1679 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) { 1680 /* 1681 * Reset all synchronization data for this disk, 1682 * because if it even was synchronized, it was 1683 * synchronized to disks with different syncid. 1684 */ 1685 disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING; 1686 disk->d_sync.ds_offset = 0; 1687 disk->d_sync.ds_offset_done = 0; 1688 disk->d_sync.ds_syncid = sc->sc_syncid; 1689 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 1690 (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 1691 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 1692 } else { 1693 state = G_MIRROR_DISK_STATE_STALE; 1694 } 1695 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ { 1696 /* 1697 * Not good, NOT GOOD! 1698 * It means that mirror was started on stale disks 1699 * and more fresh disk just arrive. 1700 * If there were writes, mirror is fucked up, sorry. 1701 * I think the best choice here is don't touch 1702 * this disk and inform the user laudly. 1703 */ 1704 G_MIRROR_DEBUG(0, "Device %s was started before the freshest " 1705 "disk (%s) arrives!! It will not be connected to the " 1706 "running device.", sc->sc_name, 1707 g_mirror_get_diskname(disk)); 1708 g_mirror_destroy_disk(disk); 1709 state = G_MIRROR_DISK_STATE_NONE; 1710 /* Return immediately, because disk was destroyed. */ 1711 return (state); 1712 } 1713 G_MIRROR_DEBUG(3, "State for %s disk: %s.", 1714 g_mirror_get_diskname(disk), g_mirror_disk_state2str(state)); 1715 return (state); 1716} 1717 1718/* 1719 * Update device state. 1720 */ 1721static void 1722g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force) 1723{ 1724 struct g_mirror_disk *disk; 1725 u_int state; 1726 1727 g_topology_assert(); 1728 1729 switch (sc->sc_state) { 1730 case G_MIRROR_DEVICE_STATE_STARTING: 1731 { 1732 struct g_mirror_disk *pdisk; 1733 u_int dirty, ndisks, syncid; 1734 1735 KASSERT(sc->sc_provider == NULL, 1736 ("Non-NULL provider in STARTING state (%s).", sc->sc_name)); 1737 /* 1738 * Are we ready? We are, if all disks are connected or 1739 * if we have any disks and 'force' is true. 1740 */ 1741 if ((force && g_mirror_ndisks(sc, -1) > 0) || 1742 sc->sc_ndisks == g_mirror_ndisks(sc, -1)) { 1743 ; 1744 } else if (g_mirror_ndisks(sc, -1) == 0) { 1745 /* 1746 * Disks went down in starting phase, so destroy 1747 * device. 1748 */ 1749 callout_drain(&sc->sc_callout); 1750 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 1751 return; 1752 } else { 1753 return; 1754 } 1755 1756 /* 1757 * Activate all disks with the biggest syncid. 1758 */ 1759 if (force) { 1760 /* 1761 * If 'force' is true, we have been called due to 1762 * timeout, so don't bother canceling timeout. 1763 */ 1764 ndisks = 0; 1765 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1766 if ((disk->d_flags & 1767 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 1768 ndisks++; 1769 } 1770 } 1771 if (ndisks == 0) { 1772 /* No valid disks found, destroy device. */ 1773 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 1774 return; 1775 } 1776 } else { 1777 /* Cancel timeout. */ 1778 callout_drain(&sc->sc_callout); 1779 } 1780 1781 /* 1782 * Find disk with the biggest syncid. 1783 */ 1784 syncid = 0; 1785 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1786 if (disk->d_sync.ds_syncid > syncid) 1787 syncid = disk->d_sync.ds_syncid; 1788 } 1789 1790 /* 1791 * Here we need to look for dirty disks and if all disks 1792 * with the biggest syncid are dirty, we have to choose 1793 * one with the biggest priority and rebuild the rest. 1794 */ 1795 /* 1796 * Find the number of dirty disks with the biggest syncid. 1797 * Find the number of disks with the biggest syncid. 1798 * While here, find a disk with the biggest priority. 1799 */ 1800 dirty = ndisks = 0; 1801 pdisk = NULL; 1802 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1803 if (disk->d_sync.ds_syncid != syncid) 1804 continue; 1805 if ((disk->d_flags & 1806 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 1807 continue; 1808 } 1809 ndisks++; 1810 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 1811 dirty++; 1812 if (pdisk == NULL || 1813 pdisk->d_priority < disk->d_priority) { 1814 pdisk = disk; 1815 } 1816 } 1817 } 1818 if (dirty == 0) { 1819 /* No dirty disks at all, great. */ 1820 } else if (dirty == ndisks) { 1821 /* 1822 * Force synchronization for all dirty disks except one 1823 * with the biggest priority. 1824 */ 1825 KASSERT(pdisk != NULL, ("pdisk == NULL")); 1826 G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a " 1827 "master disk for synchronization.", 1828 g_mirror_get_diskname(pdisk), sc->sc_name); 1829 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1830 if (disk->d_sync.ds_syncid != syncid) 1831 continue; 1832 if ((disk->d_flags & 1833 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 1834 continue; 1835 } 1836 KASSERT((disk->d_flags & 1837 G_MIRROR_DISK_FLAG_DIRTY) != 0, 1838 ("Disk %s isn't marked as dirty.", 1839 g_mirror_get_diskname(disk))); 1840 /* Skip the disk with the biggest priority. */ 1841 if (disk == pdisk) 1842 continue; 1843 disk->d_sync.ds_syncid = 0; 1844 } 1845 } else if (dirty < ndisks) { 1846 /* 1847 * Force synchronization for all dirty disks. 1848 * We have some non-dirty disks. 1849 */ 1850 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1851 if (disk->d_sync.ds_syncid != syncid) 1852 continue; 1853 if ((disk->d_flags & 1854 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 1855 continue; 1856 } 1857 if ((disk->d_flags & 1858 G_MIRROR_DISK_FLAG_DIRTY) == 0) { 1859 continue; 1860 } 1861 disk->d_sync.ds_syncid = 0; 1862 } 1863 } 1864 1865 /* Reset hint. */ 1866 sc->sc_hint = NULL; 1867 sc->sc_syncid = syncid; 1868 if (force) { 1869 /* Remember to bump syncid on first write. */ 1870 sc->sc_bump_syncid = G_MIRROR_BUMP_ON_FIRST_WRITE; 1871 } 1872 state = G_MIRROR_DEVICE_STATE_RUNNING; 1873 G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.", 1874 sc->sc_name, g_mirror_device_state2str(sc->sc_state), 1875 g_mirror_device_state2str(state)); 1876 sc->sc_state = state; 1877 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1878 state = g_mirror_determine_state(disk); 1879 g_mirror_event_send(disk, state, 1880 G_MIRROR_EVENT_DONTWAIT); 1881 if (state == G_MIRROR_DISK_STATE_STALE) { 1882 sc->sc_bump_syncid = 1883 G_MIRROR_BUMP_ON_FIRST_WRITE; 1884 } 1885 } 1886 break; 1887 } 1888 case G_MIRROR_DEVICE_STATE_RUNNING: 1889 /* 1890 * Bump syncid here, if we need to do it immediately. 1891 */ 1892 if (sc->sc_bump_syncid == G_MIRROR_BUMP_IMMEDIATELY) { 1893 sc->sc_bump_syncid = 0; 1894 g_mirror_bump_syncid(sc); 1895 } 1896 if (g_mirror_ndisks(sc, -1) == 0) { 1897 /* 1898 * No disks at all, we need to destroy device. 1899 */ 1900 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 1901 } else if (g_mirror_ndisks(sc, 1902 G_MIRROR_DISK_STATE_ACTIVE) == 0 && 1903 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 1904 /* 1905 * No active disks, destroy provider. 1906 */ 1907 if (sc->sc_provider != NULL) 1908 g_mirror_destroy_provider(sc); 1909 } else if (g_mirror_ndisks(sc, 1910 G_MIRROR_DISK_STATE_ACTIVE) > 0 && 1911 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 1912 /* 1913 * We have active disks, launch provider if it doesn't 1914 * exist. 1915 */ 1916 if (sc->sc_provider == NULL) 1917 g_mirror_launch_provider(sc); 1918 } 1919 break; 1920 default: 1921 KASSERT(1 == 0, ("Wrong device state (%s, %s).", 1922 sc->sc_name, g_mirror_device_state2str(sc->sc_state))); 1923 break; 1924 } 1925} 1926 1927/* 1928 * Update disk state and device state if needed. 1929 */ 1930#define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \ 1931 "Disk %s state changed from %s to %s (device %s).", \ 1932 g_mirror_get_diskname(disk), \ 1933 g_mirror_disk_state2str(disk->d_state), \ 1934 g_mirror_disk_state2str(state), sc->sc_name) 1935static int 1936g_mirror_update_disk(struct g_mirror_disk *disk, u_int state) 1937{ 1938 struct g_mirror_softc *sc; 1939 1940 g_topology_assert(); 1941 1942 sc = disk->d_softc; 1943again: 1944 G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.", 1945 g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state), 1946 g_mirror_disk_state2str(state)); 1947 switch (state) { 1948 case G_MIRROR_DISK_STATE_NEW: 1949 /* 1950 * Possible scenarios: 1951 * 1. New disk arrive. 1952 */ 1953 /* Previous state should be NONE. */ 1954 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE, 1955 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 1956 g_mirror_disk_state2str(disk->d_state))); 1957 DISK_STATE_CHANGED(); 1958 1959 disk->d_state = state; 1960 if (LIST_EMPTY(&sc->sc_disks)) 1961 LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next); 1962 else { 1963 struct g_mirror_disk *dp; 1964 1965 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1966 if (disk->d_priority >= dp->d_priority) { 1967 LIST_INSERT_BEFORE(dp, disk, d_next); 1968 dp = NULL; 1969 break; 1970 } 1971 if (LIST_NEXT(dp, d_next) == NULL) 1972 break; 1973 } 1974 if (dp != NULL) 1975 LIST_INSERT_AFTER(dp, disk, d_next); 1976 } 1977 G_MIRROR_DEBUG(0, "Device %s: provider %s detected.", 1978 sc->sc_name, g_mirror_get_diskname(disk)); 1979 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 1980 break; 1981 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1982 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 1983 g_mirror_device_state2str(sc->sc_state), 1984 g_mirror_get_diskname(disk), 1985 g_mirror_disk_state2str(disk->d_state))); 1986 state = g_mirror_determine_state(disk); 1987 if (state != G_MIRROR_DISK_STATE_NONE) 1988 goto again; 1989 break; 1990 case G_MIRROR_DISK_STATE_ACTIVE: 1991 /* 1992 * Possible scenarios: 1993 * 1. New disk does not need synchronization. 1994 * 2. Synchronization process finished successfully. 1995 */ 1996 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1997 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 1998 g_mirror_device_state2str(sc->sc_state), 1999 g_mirror_get_diskname(disk), 2000 g_mirror_disk_state2str(disk->d_state))); 2001 /* Previous state should be NEW or SYNCHRONIZING. */ 2002 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW || 2003 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2004 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2005 g_mirror_disk_state2str(disk->d_state))); 2006 DISK_STATE_CHANGED(); 2007 2008 if (disk->d_state == G_MIRROR_DISK_STATE_NEW) 2009 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2010 else if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2011 disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2012 disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC; 2013 g_mirror_sync_stop(disk, 0); 2014 } 2015 disk->d_state = state; 2016 disk->d_sync.ds_offset = 0; 2017 disk->d_sync.ds_offset_done = 0; 2018 g_mirror_update_access(disk); 2019 g_mirror_update_metadata(disk); 2020 G_MIRROR_DEBUG(0, "Device %s: provider %s activated.", 2021 sc->sc_name, g_mirror_get_diskname(disk)); 2022 break; 2023 case G_MIRROR_DISK_STATE_STALE: 2024 /* 2025 * Possible scenarios: 2026 * 1. Stale disk was connected. 2027 */ 2028 /* Previous state should be NEW. */ 2029 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2030 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2031 g_mirror_disk_state2str(disk->d_state))); 2032 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2033 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2034 g_mirror_device_state2str(sc->sc_state), 2035 g_mirror_get_diskname(disk), 2036 g_mirror_disk_state2str(disk->d_state))); 2037 /* 2038 * STALE state is only possible if device is marked 2039 * NOAUTOSYNC. 2040 */ 2041 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0, 2042 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2043 g_mirror_device_state2str(sc->sc_state), 2044 g_mirror_get_diskname(disk), 2045 g_mirror_disk_state2str(disk->d_state))); 2046 DISK_STATE_CHANGED(); 2047 2048 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2049 disk->d_state = state; 2050 g_mirror_update_metadata(disk); 2051 G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.", 2052 sc->sc_name, g_mirror_get_diskname(disk)); 2053 break; 2054 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 2055 /* 2056 * Possible scenarios: 2057 * 1. Disk which needs synchronization was connected. 2058 */ 2059 /* Previous state should be NEW. */ 2060 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2061 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2062 g_mirror_disk_state2str(disk->d_state))); 2063 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2064 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2065 g_mirror_device_state2str(sc->sc_state), 2066 g_mirror_get_diskname(disk), 2067 g_mirror_disk_state2str(disk->d_state))); 2068 DISK_STATE_CHANGED(); 2069 2070 if (disk->d_state == G_MIRROR_DISK_STATE_NEW) 2071 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2072 disk->d_state = state; 2073 if (sc->sc_provider != NULL) { 2074 g_mirror_sync_start(disk); 2075 g_mirror_update_metadata(disk); 2076 } 2077 break; 2078 case G_MIRROR_DISK_STATE_DISCONNECTED: 2079 /* 2080 * Possible scenarios: 2081 * 1. Device wasn't running yet, but disk disappear. 2082 * 2. Disk was active and disapppear. 2083 * 3. Disk disappear during synchronization process. 2084 */ 2085 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) { 2086 /* 2087 * Previous state should be ACTIVE, STALE or 2088 * SYNCHRONIZING. 2089 */ 2090 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 2091 disk->d_state == G_MIRROR_DISK_STATE_STALE || 2092 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2093 ("Wrong disk state (%s, %s).", 2094 g_mirror_get_diskname(disk), 2095 g_mirror_disk_state2str(disk->d_state))); 2096 } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) { 2097 /* Previous state should be NEW. */ 2098 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2099 ("Wrong disk state (%s, %s).", 2100 g_mirror_get_diskname(disk), 2101 g_mirror_disk_state2str(disk->d_state))); 2102 /* 2103 * Reset bumping syncid if disk disappeared in STARTING 2104 * state. 2105 */ 2106 if (sc->sc_bump_syncid == G_MIRROR_BUMP_ON_FIRST_WRITE) 2107 sc->sc_bump_syncid = 0; 2108#ifdef INVARIANTS 2109 } else { 2110 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).", 2111 sc->sc_name, 2112 g_mirror_device_state2str(sc->sc_state), 2113 g_mirror_get_diskname(disk), 2114 g_mirror_disk_state2str(disk->d_state))); 2115#endif 2116 } 2117 DISK_STATE_CHANGED(); 2118 G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.", 2119 sc->sc_name, g_mirror_get_diskname(disk)); 2120 2121 g_mirror_destroy_disk(disk); 2122 break; 2123 case G_MIRROR_DISK_STATE_DESTROY: 2124 { 2125 int error; 2126 2127 error = g_mirror_clear_metadata(disk); 2128 if (error != 0) 2129 return (error); 2130 DISK_STATE_CHANGED(); 2131 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", 2132 sc->sc_name, g_mirror_get_diskname(disk)); 2133 2134 g_mirror_destroy_disk(disk); 2135 sc->sc_ndisks--; 2136 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2137 g_mirror_update_metadata(disk); 2138 } 2139 break; 2140 } 2141 default: 2142 KASSERT(1 == 0, ("Unknown state (%u).", state)); 2143 break; 2144 } 2145 return (0); 2146} 2147#undef DISK_STATE_CHANGED 2148 2149static int 2150g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md) 2151{ 2152 struct g_provider *pp; 2153 u_char *buf; 2154 int error; 2155 2156 g_topology_assert(); 2157 2158 error = g_access(cp, 1, 0, 0); 2159 if (error != 0) 2160 return (error); 2161 pp = cp->provider; 2162 g_topology_unlock(); 2163 /* Metadata are stored on last sector. */ 2164 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 2165 &error); 2166 g_topology_lock(); 2167 if (buf == NULL) { 2168 g_access(cp, -1, 0, 0); 2169 return (error); 2170 } 2171 if (error != 0) { 2172 g_access(cp, -1, 0, 0); 2173 g_free(buf); 2174 return (error); 2175 } 2176 error = g_access(cp, -1, 0, 0); 2177 KASSERT(error == 0, ("Cannot decrease access count for %s.", pp->name)); 2178 2179 /* Decode metadata. */ 2180 error = mirror_metadata_decode(buf, md); 2181 g_free(buf); 2182 if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0) 2183 return (EINVAL); 2184 if (error != 0) { 2185 G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.", 2186 cp->provider->name); 2187 return (error); 2188 } 2189 2190 return (0); 2191} 2192 2193static int 2194g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp, 2195 struct g_mirror_metadata *md) 2196{ 2197 2198 if (g_mirror_id2disk(sc, md->md_did) != NULL) { 2199 G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.", 2200 pp->name, md->md_did); 2201 return (EEXIST); 2202 } 2203 if (md->md_all != sc->sc_ndisks) { 2204 G_MIRROR_DEBUG(1, 2205 "Invalid '%s' field on disk %s (device %s), skipping.", 2206 "md_all", pp->name, sc->sc_name); 2207 return (EINVAL); 2208 } 2209 if (md->md_slice != sc->sc_slice) { 2210 G_MIRROR_DEBUG(1, 2211 "Invalid '%s' field on disk %s (device %s), skipping.", 2212 "md_slice", pp->name, sc->sc_name); 2213 return (EINVAL); 2214 } 2215 if (md->md_balance != sc->sc_balance) { 2216 G_MIRROR_DEBUG(1, 2217 "Invalid '%s' field on disk %s (device %s), skipping.", 2218 "md_balance", pp->name, sc->sc_name); 2219 return (EINVAL); 2220 } 2221 if (md->md_mediasize != sc->sc_mediasize) { 2222 G_MIRROR_DEBUG(1, 2223 "Invalid '%s' field on disk %s (device %s), skipping.", 2224 "md_mediasize", pp->name, sc->sc_name); 2225 return (EINVAL); 2226 } 2227 if (sc->sc_mediasize > pp->mediasize) { 2228 G_MIRROR_DEBUG(1, 2229 "Invalid size of disk %s (device %s), skipping.", pp->name, 2230 sc->sc_name); 2231 return (EINVAL); 2232 } 2233 if (md->md_sectorsize != sc->sc_sectorsize) { 2234 G_MIRROR_DEBUG(1, 2235 "Invalid '%s' field on disk %s (device %s), skipping.", 2236 "md_sectorsize", pp->name, sc->sc_name); 2237 return (EINVAL); 2238 } 2239 if ((sc->sc_sectorsize % pp->sectorsize) != 0) { 2240 G_MIRROR_DEBUG(1, 2241 "Invalid sector size of disk %s (device %s), skipping.", 2242 pp->name, sc->sc_name); 2243 return (EINVAL); 2244 } 2245 if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) { 2246 G_MIRROR_DEBUG(1, 2247 "Invalid device flags on disk %s (device %s), skipping.", 2248 pp->name, sc->sc_name); 2249 return (EINVAL); 2250 } 2251 if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) { 2252 G_MIRROR_DEBUG(1, 2253 "Invalid disk flags on disk %s (device %s), skipping.", 2254 pp->name, sc->sc_name); 2255 return (EINVAL); 2256 } 2257 return (0); 2258} 2259 2260static int 2261g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp, 2262 struct g_mirror_metadata *md) 2263{ 2264 struct g_mirror_disk *disk; 2265 int error; 2266 2267 g_topology_assert(); 2268 G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name); 2269 2270 error = g_mirror_check_metadata(sc, pp, md); 2271 if (error != 0) 2272 return (error); 2273 disk = g_mirror_init_disk(sc, pp, md, &error); 2274 if (disk == NULL) 2275 return (error); 2276 error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW, 2277 G_MIRROR_EVENT_WAIT); 2278 return (error); 2279} 2280 2281static int 2282g_mirror_access(struct g_provider *pp, int acr, int acw, int ace) 2283{ 2284 struct g_mirror_softc *sc; 2285 struct g_mirror_disk *disk; 2286 int dcr, dcw, dce, err, error; 2287 2288 g_topology_assert(); 2289 G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr, 2290 acw, ace); 2291 2292 dcr = pp->acr + acr; 2293 dcw = pp->acw + acw; 2294 dce = pp->ace + ace; 2295 2296 /* On first open, grab an extra "exclusive" bit */ 2297 if (pp->acr == 0 && pp->acw == 0 && pp->ace == 0) 2298 ace++; 2299 /* ... and let go of it on last close */ 2300 if (dcr == 0 && dcw == 0 && dce == 0) 2301 ace--; 2302 2303 sc = pp->geom->softc; 2304 if (sc == NULL || LIST_EMPTY(&sc->sc_disks)) { 2305 if (acr <= 0 && acw <= 0 && ace <= 0) 2306 return (0); 2307 else 2308 return (ENXIO); 2309 } 2310 error = ENXIO; 2311 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2312 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 2313 continue; 2314 err = g_access(disk->d_consumer, acr, acw, ace); 2315 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", 2316 g_mirror_get_diskname(disk), acr, acw, ace, err); 2317 if (err == 0) { 2318 /* 2319 * Mark disk as dirty on open and unmark on close. 2320 */ 2321 if (pp->acw == 0 && dcw > 0) { 2322 G_MIRROR_DEBUG(1, 2323 "Disk %s (device %s) marked as dirty.", 2324 g_mirror_get_diskname(disk), sc->sc_name); 2325 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 2326 g_mirror_update_metadata(disk); 2327 } else if (pp->acw > 0 && dcw == 0) { 2328 G_MIRROR_DEBUG(1, 2329 "Disk %s (device %s) marked as clean.", 2330 g_mirror_get_diskname(disk), sc->sc_name); 2331 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2332 g_mirror_update_metadata(disk); 2333 } 2334 error = 0; 2335 } else { 2336 sc->sc_bump_syncid = G_MIRROR_BUMP_ON_FIRST_WRITE; 2337 g_mirror_event_send(disk, 2338 G_MIRROR_DISK_STATE_DISCONNECTED, 2339 G_MIRROR_EVENT_DONTWAIT); 2340 } 2341 } 2342 return (error); 2343} 2344 2345static struct g_geom * 2346g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md) 2347{ 2348 struct g_mirror_softc *sc; 2349 struct g_geom *gp; 2350 int error, timeout; 2351 2352 g_topology_assert(); 2353 G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name, 2354 md->md_mid); 2355 2356 /* One disk is minimum. */ 2357 if (md->md_all < 1) 2358 return (NULL); 2359 /* 2360 * Action geom. 2361 */ 2362 gp = g_new_geomf(mp, "%s", md->md_name); 2363 sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO); 2364 gp->start = g_mirror_start; 2365 gp->spoiled = g_mirror_spoiled; 2366 gp->orphan = g_mirror_orphan; 2367 gp->access = g_mirror_access; 2368 gp->dumpconf = g_mirror_dumpconf; 2369 2370 sc->sc_id = md->md_mid; 2371 sc->sc_slice = md->md_slice; 2372 sc->sc_balance = md->md_balance; 2373 sc->sc_mediasize = md->md_mediasize; 2374 sc->sc_sectorsize = md->md_sectorsize; 2375 sc->sc_ndisks = md->md_all; 2376 sc->sc_flags = md->md_mflags; 2377 sc->sc_bump_syncid = 0; 2378 bioq_init(&sc->sc_queue); 2379 mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF); 2380 LIST_INIT(&sc->sc_disks); 2381 TAILQ_INIT(&sc->sc_events); 2382 mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF); 2383 callout_init(&sc->sc_callout, CALLOUT_MPSAFE); 2384 sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING; 2385 gp->softc = sc; 2386 sc->sc_geom = gp; 2387 sc->sc_provider = NULL; 2388 /* 2389 * Synchronization geom. 2390 */ 2391 gp = g_new_geomf(mp, "%s.sync", md->md_name); 2392 gp->softc = sc; 2393 gp->spoiled = g_mirror_spoiled; 2394 gp->orphan = g_mirror_orphan; 2395 sc->sc_sync.ds_geom = gp; 2396 sc->sc_sync.ds_block = atomic_load_acq_int(&g_mirror_sync_block_size); 2397 sc->sc_sync.ds_ndisks = 0; 2398 sc->sc_sync.ds_zone = uma_zcreate("gmirror:sync", sc->sc_sync.ds_block, 2399 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 2400 error = kthread_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0, 2401 "g_mirror %s", md->md_name); 2402 if (error != 0) { 2403 G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.", 2404 sc->sc_name); 2405 uma_zdestroy(sc->sc_sync.ds_zone); 2406 g_destroy_geom(sc->sc_sync.ds_geom); 2407 mtx_destroy(&sc->sc_events_mtx); 2408 mtx_destroy(&sc->sc_queue_mtx); 2409 g_destroy_geom(sc->sc_geom); 2410 free(sc, M_MIRROR); 2411 return (NULL); 2412 } 2413 2414 G_MIRROR_DEBUG(0, "Device %s created (id=%u).", sc->sc_name, sc->sc_id); 2415 2416 /* 2417 * Run timeout. 2418 */ 2419 timeout = atomic_load_acq_int(&g_mirror_timeout); 2420 callout_reset(&sc->sc_callout, timeout * hz, g_mirror_go, sc); 2421 return (sc->sc_geom); 2422} 2423 2424int 2425g_mirror_destroy(struct g_mirror_softc *sc, boolean_t force) 2426{ 2427 struct g_provider *pp; 2428 2429 g_topology_assert(); 2430 2431 if (sc == NULL) 2432 return (ENXIO); 2433 pp = sc->sc_provider; 2434 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 2435 if (force) { 2436 G_MIRROR_DEBUG(0, "Device %s is still open, so it " 2437 "can't be definitely removed.", pp->name); 2438 } else { 2439 G_MIRROR_DEBUG(1, 2440 "Device %s is still open (r%dw%de%d).", pp->name, 2441 pp->acr, pp->acw, pp->ace); 2442 return (EBUSY); 2443 } 2444 } 2445 2446 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2447 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_WAIT; 2448 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 2449 mtx_lock(&sc->sc_queue_mtx); 2450 wakeup(sc); 2451 mtx_unlock(&sc->sc_queue_mtx); 2452 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker); 2453 while (sc->sc_worker != NULL) 2454 tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5); 2455 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker); 2456 g_mirror_destroy_device(sc); 2457 free(sc, M_MIRROR); 2458 return (0); 2459} 2460 2461static void 2462g_mirror_taste_orphan(struct g_consumer *cp) 2463{ 2464 2465 KASSERT(1 == 0, ("%s called while tasting %s.", __func__, 2466 cp->provider->name)); 2467} 2468 2469static struct g_geom * 2470g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 2471{ 2472 struct g_mirror_metadata md; 2473 struct g_mirror_softc *sc; 2474 struct g_consumer *cp; 2475 struct g_geom *gp; 2476 int error; 2477 2478 g_topology_assert(); 2479 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 2480 G_MIRROR_DEBUG(2, "Tasting %s.", pp->name); 2481 2482 gp = g_new_geomf(mp, "mirror:taste"); 2483 /* 2484 * This orphan function should be never called. 2485 */ 2486 gp->orphan = g_mirror_taste_orphan; 2487 cp = g_new_consumer(gp); 2488 g_attach(cp, pp); 2489 error = g_mirror_read_metadata(cp, &md); 2490 g_detach(cp); 2491 g_destroy_consumer(cp); 2492 g_destroy_geom(gp); 2493 if (error != 0) 2494 return (NULL); 2495 gp = NULL; 2496 2497 if (md.md_version > G_MIRROR_VERSION) { 2498 printf("geom_mirror.ko module is too old to handle %s.\n", 2499 pp->name); 2500 return (NULL); 2501 } 2502 if (md.md_provider[0] != '\0' && strcmp(md.md_provider, pp->name) != 0) 2503 return (NULL); 2504 if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) { 2505 G_MIRROR_DEBUG(0, 2506 "Device %s: provider %s marked as inactive, skipping.", 2507 md.md_name, pp->name); 2508 return (NULL); 2509 } 2510 if (g_mirror_debug >= 2) 2511 mirror_metadata_dump(&md); 2512 2513 /* 2514 * Let's check if device already exists. 2515 */ 2516 LIST_FOREACH(gp, &mp->geom, geom) { 2517 sc = gp->softc; 2518 if (sc == NULL) 2519 continue; 2520 if (sc->sc_sync.ds_geom == gp) 2521 continue; 2522 if (strcmp(md.md_name, sc->sc_name) != 0) 2523 continue; 2524 if (md.md_mid != sc->sc_id) { 2525 G_MIRROR_DEBUG(0, "Device %s already configured.", 2526 sc->sc_name); 2527 return (NULL); 2528 } 2529 break; 2530 } 2531 if (gp == NULL) { 2532 gp = g_mirror_create(mp, &md); 2533 if (gp == NULL) { 2534 G_MIRROR_DEBUG(0, "Cannot create device %s.", 2535 md.md_name); 2536 return (NULL); 2537 } 2538 sc = gp->softc; 2539 } 2540 G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name); 2541 error = g_mirror_add_disk(sc, pp, &md); 2542 if (error != 0) { 2543 G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).", 2544 pp->name, gp->name, error); 2545 if (LIST_EMPTY(&sc->sc_disks)) 2546 g_mirror_destroy(sc, 1); 2547 return (NULL); 2548 } 2549 return (gp); 2550} 2551 2552static int 2553g_mirror_destroy_geom(struct gctl_req *req __unused, 2554 struct g_class *mp __unused, struct g_geom *gp) 2555{ 2556 2557 return (g_mirror_destroy(gp->softc, 0)); 2558} 2559 2560static void 2561g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 2562 struct g_consumer *cp, struct g_provider *pp) 2563{ 2564 struct g_mirror_softc *sc; 2565 2566 g_topology_assert(); 2567 2568 sc = gp->softc; 2569 if (sc == NULL) 2570 return; 2571 /* Skip synchronization geom. */ 2572 if (gp == sc->sc_sync.ds_geom) 2573 return; 2574 if (pp != NULL) { 2575 /* Nothing here. */ 2576 } else if (cp != NULL) { 2577 struct g_mirror_disk *disk; 2578 2579 disk = cp->private; 2580 if (disk == NULL) 2581 return; 2582 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id); 2583 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2584 sbuf_printf(sb, "%s<Synchronized>", indent); 2585 if (disk->d_sync.ds_offset_done == 0) 2586 sbuf_printf(sb, "0%%"); 2587 else { 2588 sbuf_printf(sb, "%u%%", 2589 (u_int)((disk->d_sync.ds_offset_done * 100) / 2590 sc->sc_provider->mediasize)); 2591 } 2592 sbuf_printf(sb, "</Synchronized>\n"); 2593 } 2594 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, 2595 disk->d_sync.ds_syncid); 2596 sbuf_printf(sb, "%s<Flags>", indent); 2597 if (disk->d_flags == 0) 2598 sbuf_printf(sb, "NONE"); 2599 else { 2600 int first = 1; 2601 2602 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 2603 if (!first) 2604 sbuf_printf(sb, ", "); 2605 else 2606 first = 0; 2607 sbuf_printf(sb, "DIRTY"); 2608 } 2609 if ((disk->d_flags & 2610 G_MIRROR_DISK_FLAG_INACTIVE) != 0) { 2611 if (!first) 2612 sbuf_printf(sb, ", "); 2613 else 2614 first = 0; 2615 sbuf_printf(sb, "INACTIVE"); 2616 } 2617 if ((disk->d_flags & 2618 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2619 if (!first) 2620 sbuf_printf(sb, ", "); 2621 else 2622 first = 0; 2623 sbuf_printf(sb, "SYNCHRONIZING"); 2624 } 2625 if ((disk->d_flags & 2626 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2627 if (!first) 2628 sbuf_printf(sb, ", "); 2629 else 2630 first = 0; 2631 sbuf_printf(sb, "FORCE_SYNC"); 2632 } 2633 } 2634 sbuf_printf(sb, "</Flags>\n"); 2635 sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent, 2636 disk->d_priority); 2637 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 2638 g_mirror_disk_state2str(disk->d_state)); 2639 } else { 2640 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id); 2641 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid); 2642 sbuf_printf(sb, "%s<Flags>", indent); 2643 if (sc->sc_flags == 0) 2644 sbuf_printf(sb, "NONE"); 2645 else { 2646 int first = 1; 2647 2648 if ((sc->sc_flags & 2649 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0) { 2650 if (!first) 2651 sbuf_printf(sb, ", "); 2652 else 2653 first = 0; 2654 sbuf_printf(sb, "NOAUTOSYNC"); 2655 } 2656 } 2657 sbuf_printf(sb, "</Flags>\n"); 2658 sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent, 2659 (u_int)sc->sc_slice); 2660 sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent, 2661 balance_name(sc->sc_balance)); 2662 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent, 2663 sc->sc_ndisks); 2664 } 2665} 2666 2667DECLARE_GEOM_CLASS(g_mirror_class, g_mirror); 2668