Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/geom/vinum/geom_vinum_drive.c
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1 /*- 2 * Copyright (c) 2004, 2005 Lukas Ertl 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 AUTHOR 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 AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/bio.h> 32 #include <sys/errno.h> 33 #include <sys/conf.h> 34 #include <sys/kernel.h> 35 #include <sys/kthread.h> 36 #include <sys/libkern.h> 37 #include <sys/lock.h> 38 #include <sys/malloc.h> 39 #include <sys/module.h> 40 #include <sys/mutex.h> 41 #include <sys/sbuf.h> 42 #include <sys/systm.h> 43 #include <sys/time.h> 44 45 #include <geom/geom.h> 46 #include <geom/vinum/geom_vinum_var.h> 47 #include <geom/vinum/geom_vinum.h> 48 #include <geom/vinum/geom_vinum_share.h> 49 50 static void gv_drive_dead(void *, int); 51 static void gv_drive_worker(void *); 52 53 void 54 gv_config_new_drive(struct gv_drive *d) 55 { 56 struct gv_hdr *vhdr; 57 struct gv_freelist *fl; 58 59 KASSERT(d != NULL, ("config_new_drive: NULL d")); 60 61 vhdr = g_malloc(sizeof(*vhdr), M_WAITOK | M_ZERO); 62 vhdr->magic = GV_MAGIC; 63 vhdr->config_length = GV_CFG_LEN; 64 65 bcopy(hostname, vhdr->label.sysname, GV_HOSTNAME_LEN); 66 strncpy(vhdr->label.name, d->name, GV_MAXDRIVENAME); 67 microtime(&vhdr->label.date_of_birth); 68 69 d->hdr = vhdr; 70 71 LIST_INIT(&d->subdisks); 72 LIST_INIT(&d->freelist); 73 74 fl = g_malloc(sizeof(struct gv_freelist), M_WAITOK | M_ZERO); 75 fl->offset = GV_DATA_START; 76 fl->size = d->avail; 77 LIST_INSERT_HEAD(&d->freelist, fl, freelist); 78 d->freelist_entries = 1; 79 80 d->bqueue = g_malloc(sizeof(struct bio_queue_head), M_WAITOK | M_ZERO); 81 bioq_init(d->bqueue); 82 mtx_init(&d->bqueue_mtx, "gv_drive", NULL, MTX_DEF); 83 kthread_create(gv_drive_worker, d, NULL, 0, 0, "gv_d %s", d->name); 84 d->flags |= GV_DRIVE_THREAD_ACTIVE; 85 } 86 87 void 88 gv_save_config_all(struct gv_softc *sc) 89 { 90 struct gv_drive *d; 91 92 g_topology_assert(); 93 94 LIST_FOREACH(d, &sc->drives, drive) { 95 if (d->geom == NULL) 96 continue; 97 gv_save_config(NULL, d, sc); 98 } 99 } 100 101 /* Save the vinum configuration back to disk. */ 102 void 103 gv_save_config(struct g_consumer *cp, struct gv_drive *d, struct gv_softc *sc) 104 { 105 struct g_geom *gp; 106 struct g_consumer *cp2; 107 struct gv_hdr *vhdr, *hdr; 108 struct sbuf *sb; 109 int error; 110 111 g_topology_assert(); 112 113 KASSERT(d != NULL, ("gv_save_config: null d")); 114 KASSERT(sc != NULL, ("gv_save_config: null sc")); 115 116 /* 117 * We can't save the config on a drive that isn't up, but drives that 118 * were just created aren't officially up yet, so we check a special 119 * flag. 120 */ 121 if ((d->state != GV_DRIVE_UP) && !(d->flags && GV_DRIVE_NEWBORN)) 122 return; 123 124 if (cp == NULL) { 125 gp = d->geom; 126 KASSERT(gp != NULL, ("gv_save_config: null gp")); 127 cp2 = LIST_FIRST(&gp->consumer); 128 KASSERT(cp2 != NULL, ("gv_save_config: null cp2")); 129 } else 130 cp2 = cp; 131 132 vhdr = g_malloc(GV_HDR_LEN, M_WAITOK | M_ZERO); 133 vhdr->magic = GV_MAGIC; 134 vhdr->config_length = GV_CFG_LEN; 135 136 hdr = d->hdr; 137 if (hdr == NULL) { 138 printf("GEOM_VINUM: drive %s has NULL hdr\n", d->name); 139 g_free(vhdr); 140 return; 141 } 142 microtime(&hdr->label.last_update); 143 bcopy(&hdr->label, &vhdr->label, sizeof(struct gv_label)); 144 145 sb = sbuf_new(NULL, NULL, GV_CFG_LEN, SBUF_FIXEDLEN); 146 gv_format_config(sc, sb, 1, NULL); 147 sbuf_finish(sb); 148 149 error = g_access(cp2, 0, 1, 0); 150 if (error) { 151 printf("GEOM_VINUM: g_access failed on drive %s, errno %d\n", 152 d->name, error); 153 sbuf_delete(sb); 154 g_free(vhdr); 155 return; 156 } 157 g_topology_unlock(); 158 159 do { 160 error = g_write_data(cp2, GV_HDR_OFFSET, vhdr, GV_HDR_LEN); 161 if (error) { 162 printf("GEOM_VINUM: writing vhdr failed on drive %s, " 163 "errno %d", d->name, error); 164 break; 165 } 166 167 error = g_write_data(cp2, GV_CFG_OFFSET, sbuf_data(sb), 168 GV_CFG_LEN); 169 if (error) { 170 printf("GEOM_VINUM: writing first config copy failed " 171 "on drive %s, errno %d", d->name, error); 172 break; 173 } 174 175 error = g_write_data(cp2, GV_CFG_OFFSET + GV_CFG_LEN, 176 sbuf_data(sb), GV_CFG_LEN); 177 if (error) 178 printf("GEOM_VINUM: writing second config copy failed " 179 "on drive %s, errno %d", d->name, error); 180 } while (0); 181 182 g_topology_lock(); 183 g_access(cp2, 0, -1, 0); 184 sbuf_delete(sb); 185 g_free(vhdr); 186 187 if (d->geom != NULL) 188 gv_drive_modify(d); 189 } 190 191 /* This resembles g_slice_access(). */ 192 static int 193 gv_drive_access(struct g_provider *pp, int dr, int dw, int de) 194 { 195 struct g_geom *gp; 196 struct g_consumer *cp; 197 struct g_provider *pp2; 198 struct gv_drive *d; 199 struct gv_sd *s, *s2; 200 int error; 201 202 gp = pp->geom; 203 cp = LIST_FIRST(&gp->consumer); 204 if (cp == NULL) 205 return (0); 206 207 d = gp->softc; 208 if (d == NULL) 209 return (0); 210 211 s = pp->private; 212 KASSERT(s != NULL, ("gv_drive_access: NULL s")); 213 214 LIST_FOREACH(s2, &d->subdisks, from_drive) { 215 if (s == s2) 216 continue; 217 if (s->drive_offset + s->size <= s2->drive_offset) 218 continue; 219 if (s2->drive_offset + s2->size <= s->drive_offset) 220 continue; 221 222 /* Overlap. */ 223 pp2 = s2->provider; 224 KASSERT(s2 != NULL, ("gv_drive_access: NULL s2")); 225 if ((pp->acw + dw) > 0 && pp2->ace > 0) 226 return (EPERM); 227 if ((pp->ace + de) > 0 && pp2->acw > 0) 228 return (EPERM); 229 } 230 231 error = g_access(cp, dr, dw, de); 232 return (error); 233 } 234 235 static void 236 gv_drive_done(struct bio *bp) 237 { 238 struct gv_drive *d; 239 240 /* Put the BIO on the worker queue again. */ 241 d = bp->bio_from->geom->softc; 242 bp->bio_cflags |= GV_BIO_DONE; 243 mtx_lock(&d->bqueue_mtx); 244 bioq_insert_tail(d->bqueue, bp); 245 wakeup(d); 246 mtx_unlock(&d->bqueue_mtx); 247 } 248 249 250 static void 251 gv_drive_start(struct bio *bp) 252 { 253 struct gv_drive *d; 254 struct gv_sd *s; 255 256 switch (bp->bio_cmd) { 257 case BIO_READ: 258 case BIO_WRITE: 259 case BIO_DELETE: 260 break; 261 case BIO_GETATTR: 262 default: 263 g_io_deliver(bp, EOPNOTSUPP); 264 return; 265 } 266 267 s = bp->bio_to->private; 268 if ((s->state == GV_SD_DOWN) || (s->state == GV_SD_STALE)) { 269 g_io_deliver(bp, ENXIO); 270 return; 271 } 272 273 d = bp->bio_to->geom->softc; 274 275 /* 276 * Put the BIO on the worker queue, where the worker thread will pick 277 * it up. 278 */ 279 mtx_lock(&d->bqueue_mtx); 280 bioq_disksort(d->bqueue, bp); 281 wakeup(d); 282 mtx_unlock(&d->bqueue_mtx); 283 284 } 285 286 static void 287 gv_drive_worker(void *arg) 288 { 289 struct bio *bp, *cbp; 290 struct g_geom *gp; 291 struct g_provider *pp; 292 struct gv_drive *d; 293 struct gv_sd *s; 294 int error; 295 296 d = arg; 297 298 mtx_lock(&d->bqueue_mtx); 299 for (;;) { 300 /* We were signaled to exit. */ 301 if (d->flags & GV_DRIVE_THREAD_DIE) 302 break; 303 304 /* Take the first BIO from out queue. */ 305 bp = bioq_takefirst(d->bqueue); 306 if (bp == NULL) { 307 msleep(d, &d->bqueue_mtx, PRIBIO, "-", hz/10); 308 continue; 309 } 310 mtx_unlock(&d->bqueue_mtx); 311 312 pp = bp->bio_to; 313 gp = pp->geom; 314 315 /* Completed request. */ 316 if (bp->bio_cflags & GV_BIO_DONE) { 317 error = bp->bio_error; 318 319 /* Deliver the original request. */ 320 g_std_done(bp); 321 322 /* The request had an error, we need to clean up. */ 323 if (error != 0) { 324 g_topology_lock(); 325 gv_set_drive_state(d, GV_DRIVE_DOWN, 326 GV_SETSTATE_FORCE | GV_SETSTATE_CONFIG); 327 g_topology_unlock(); 328 g_post_event(gv_drive_dead, d, M_WAITOK, d, 329 NULL); 330 } 331 332 /* New request, needs to be sent downwards. */ 333 } else { 334 s = pp->private; 335 336 if ((s->state == GV_SD_DOWN) || 337 (s->state == GV_SD_STALE)) { 338 g_io_deliver(bp, ENXIO); 339 mtx_lock(&d->bqueue_mtx); 340 continue; 341 } 342 if (bp->bio_offset > s->size) { 343 g_io_deliver(bp, EINVAL); 344 mtx_lock(&d->bqueue_mtx); 345 continue; 346 } 347 348 cbp = g_clone_bio(bp); 349 if (cbp == NULL) { 350 g_io_deliver(bp, ENOMEM); 351 mtx_lock(&d->bqueue_mtx); 352 continue; 353 } 354 if (cbp->bio_offset + cbp->bio_length > s->size) 355 cbp->bio_length = s->size - 356 cbp->bio_offset; 357 cbp->bio_done = gv_drive_done; 358 cbp->bio_offset += s->drive_offset; 359 g_io_request(cbp, LIST_FIRST(&gp->consumer)); 360 } 361 362 mtx_lock(&d->bqueue_mtx); 363 } 364 365 while ((bp = bioq_takefirst(d->bqueue)) != NULL) { 366 mtx_unlock(&d->bqueue_mtx); 367 if (bp->bio_cflags & GV_BIO_DONE) 368 g_std_done(bp); 369 else 370 g_io_deliver(bp, ENXIO); 371 mtx_lock(&d->bqueue_mtx); 372 } 373 mtx_unlock(&d->bqueue_mtx); 374 d->flags |= GV_DRIVE_THREAD_DEAD; 375 376 kthread_exit(ENXIO); 377 } 378 379 380 static void 381 gv_drive_orphan(struct g_consumer *cp) 382 { 383 struct g_geom *gp; 384 struct gv_drive *d; 385 386 g_topology_assert(); 387 gp = cp->geom; 388 g_trace(G_T_TOPOLOGY, "gv_drive_orphan(%s)", gp->name); 389 d = gp->softc; 390 if (d != NULL) { 391 gv_set_drive_state(d, GV_DRIVE_DOWN, 392 GV_SETSTATE_FORCE | GV_SETSTATE_CONFIG); 393 g_post_event(gv_drive_dead, d, M_WAITOK, d, NULL); 394 } else 395 g_wither_geom(gp, ENXIO); 396 } 397 398 static struct g_geom * 399 gv_drive_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 400 { 401 struct g_geom *gp, *gp2; 402 struct g_consumer *cp; 403 struct gv_drive *d; 404 struct gv_sd *s; 405 struct gv_softc *sc; 406 struct gv_freelist *fl; 407 struct gv_hdr *vhdr; 408 int error; 409 char *buf, errstr[ERRBUFSIZ]; 410 411 vhdr = NULL; 412 d = NULL; 413 414 g_trace(G_T_TOPOLOGY, "gv_drive_taste(%s, %s)", mp->name, pp->name); 415 g_topology_assert(); 416 417 /* Find the VINUM class and its associated geom. */ 418 gp2 = find_vinum_geom(); 419 if (gp2 == NULL) 420 return (NULL); 421 sc = gp2->softc; 422 423 gp = g_new_geomf(mp, "%s.vinumdrive", pp->name); 424 gp->start = gv_drive_start; 425 gp->orphan = gv_drive_orphan; 426 gp->access = gv_drive_access; 427 gp->start = gv_drive_start; 428 429 cp = g_new_consumer(gp); 430 g_attach(cp, pp); 431 error = g_access(cp, 1, 0, 0); 432 if (error) { 433 g_detach(cp); 434 g_destroy_consumer(cp); 435 g_destroy_geom(gp); 436 return (NULL); 437 } 438 439 g_topology_unlock(); 440 441 /* Now check if the provided slice is a valid vinum drive. */ 442 do { 443 vhdr = g_read_data(cp, GV_HDR_OFFSET, pp->sectorsize, NULL); 444 if (vhdr == NULL) 445 break; 446 if (vhdr->magic != GV_MAGIC) { 447 g_free(vhdr); 448 break; 449 } 450 451 /* A valid vinum drive, let's parse the on-disk information. */ 452 buf = g_read_data(cp, GV_CFG_OFFSET, GV_CFG_LEN, NULL); 453 if (buf == NULL) { 454 g_free(vhdr); 455 break; 456 } 457 g_topology_lock(); 458 gv_parse_config(sc, buf, 1); 459 g_free(buf); 460 461 /* 462 * Let's see if this drive is already known in the 463 * configuration. 464 */ 465 d = gv_find_drive(sc, vhdr->label.name); 466 467 /* We already know about this drive. */ 468 if (d != NULL) { 469 /* Check if this drive already has a geom. */ 470 if (d->geom != NULL) { 471 g_topology_unlock(); 472 g_free(vhdr); 473 break; 474 } 475 bcopy(vhdr, d->hdr, sizeof(*vhdr)); 476 g_free(vhdr); 477 478 /* This is a new drive. */ 479 } else { 480 d = g_malloc(sizeof(*d), M_WAITOK | M_ZERO); 481 482 /* Initialize all needed variables. */ 483 d->size = pp->mediasize - GV_DATA_START; 484 d->avail = d->size; 485 d->hdr = vhdr; 486 strncpy(d->name, vhdr->label.name, GV_MAXDRIVENAME); 487 LIST_INIT(&d->subdisks); 488 LIST_INIT(&d->freelist); 489 490 /* We also need a freelist entry. */ 491 fl = g_malloc(sizeof(*fl), M_WAITOK | M_ZERO); 492 fl->offset = GV_DATA_START; 493 fl->size = d->avail; 494 LIST_INSERT_HEAD(&d->freelist, fl, freelist); 495 d->freelist_entries = 1; 496 497 /* Save it into the main configuration. */ 498 LIST_INSERT_HEAD(&sc->drives, d, drive); 499 } 500 501 /* 502 * Create bio queue, queue mutex and a worker thread, if 503 * necessary. 504 */ 505 if (d->bqueue == NULL) { 506 d->bqueue = g_malloc(sizeof(struct bio_queue_head), 507 M_WAITOK | M_ZERO); 508 bioq_init(d->bqueue); 509 } 510 if (mtx_initialized(&d->bqueue_mtx) == 0) 511 mtx_init(&d->bqueue_mtx, "gv_drive", NULL, MTX_DEF); 512 513 if (!(d->flags & GV_DRIVE_THREAD_ACTIVE)) { 514 kthread_create(gv_drive_worker, d, NULL, 0, 0, 515 "gv_d %s", d->name); 516 d->flags |= GV_DRIVE_THREAD_ACTIVE; 517 } 518 519 g_access(cp, -1, 0, 0); 520 521 gp->softc = d; 522 d->geom = gp; 523 d->vinumconf = sc; 524 strncpy(d->device, pp->name, GV_MAXDRIVENAME); 525 526 /* 527 * Find out which subdisks belong to this drive and crosslink 528 * them. 529 */ 530 LIST_FOREACH(s, &sc->subdisks, sd) { 531 if (!strncmp(s->drive, d->name, GV_MAXDRIVENAME)) 532 /* XXX: errors ignored */ 533 gv_sd_to_drive(sc, d, s, errstr, 534 sizeof(errstr)); 535 } 536 537 /* This drive is now up for sure. */ 538 gv_set_drive_state(d, GV_DRIVE_UP, 0); 539 540 /* 541 * If there are subdisks on this drive, we need to create 542 * providers for them. 543 */ 544 if (d->sdcount) 545 gv_drive_modify(d); 546 547 return (gp); 548 549 } while (0); 550 551 g_topology_lock(); 552 g_access(cp, -1, 0, 0); 553 554 g_detach(cp); 555 g_destroy_consumer(cp); 556 g_destroy_geom(gp); 557 return (NULL); 558 } 559 560 /* 561 * Modify the providers for the given drive 'd'. It is assumed that the 562 * subdisk list of 'd' is already correctly set up. 563 */ 564 void 565 gv_drive_modify(struct gv_drive *d) 566 { 567 struct g_geom *gp; 568 struct g_consumer *cp; 569 struct g_provider *pp, *pp2; 570 struct gv_sd *s; 571 572 KASSERT(d != NULL, ("gv_drive_modify: null d")); 573 gp = d->geom; 574 KASSERT(gp != NULL, ("gv_drive_modify: null gp")); 575 cp = LIST_FIRST(&gp->consumer); 576 KASSERT(cp != NULL, ("gv_drive_modify: null cp")); 577 pp = cp->provider; 578 KASSERT(pp != NULL, ("gv_drive_modify: null pp")); 579 580 g_topology_assert(); 581 582 LIST_FOREACH(s, &d->subdisks, from_drive) { 583 /* This subdisk already has a provider. */ 584 if (s->provider != NULL) 585 continue; 586 pp2 = g_new_providerf(gp, "gvinum/sd/%s", s->name); 587 pp2->mediasize = s->size; 588 pp2->sectorsize = pp->sectorsize; 589 g_error_provider(pp2, 0); 590 s->provider = pp2; 591 pp2->private = s; 592 } 593 } 594 595 static void 596 gv_drive_dead(void *arg, int flag) 597 { 598 struct g_geom *gp; 599 struct g_consumer *cp; 600 struct gv_drive *d; 601 struct gv_sd *s; 602 603 g_topology_assert(); 604 KASSERT(arg != NULL, ("gv_drive_dead: NULL arg")); 605 606 if (flag == EV_CANCEL) 607 return; 608 609 d = arg; 610 if (d->state != GV_DRIVE_DOWN) 611 return; 612 613 g_trace(G_T_TOPOLOGY, "gv_drive_dead(%s)", d->name); 614 615 gp = d->geom; 616 if (gp == NULL) 617 return; 618 619 LIST_FOREACH(cp, &gp->consumer, consumer) { 620 if (cp->nstart != cp->nend) { 621 printf("GEOM_VINUM: dead drive '%s' has still " 622 "active requests, can't detach consumer\n", 623 d->name); 624 g_post_event(gv_drive_dead, d, M_WAITOK, d, 625 NULL); 626 return; 627 } 628 if (cp->acr != 0 || cp->acw != 0 || cp->ace != 0) 629 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 630 } 631 632 printf("GEOM_VINUM: lost drive '%s'\n", d->name); 633 d->geom = NULL; 634 LIST_FOREACH(s, &d->subdisks, from_drive) { 635 s->provider = NULL; 636 s->consumer = NULL; 637 } 638 gv_kill_drive_thread(d); 639 gp->softc = NULL; 640 g_wither_geom(gp, ENXIO); 641 } 642 643 static int 644 gv_drive_destroy_geom(struct gctl_req *req, struct g_class *mp, 645 struct g_geom *gp) 646 { 647 struct gv_drive *d; 648 649 g_trace(G_T_TOPOLOGY, "gv_drive_destroy_geom: %s", gp->name); 650 g_topology_assert(); 651 652 d = gp->softc; 653 gv_kill_drive_thread(d); 654 655 g_wither_geom(gp, ENXIO); 656 return (0); 657 } 658 659 #define VINUMDRIVE_CLASS_NAME "VINUMDRIVE" 660 661 static struct g_class g_vinum_drive_class = { 662 .name = VINUMDRIVE_CLASS_NAME, 663 .version = G_VERSION, 664 .taste = gv_drive_taste, 665 .destroy_geom = gv_drive_destroy_geom 666 }; 667 668 DECLARE_GEOM_CLASS(g_vinum_drive_class, g_vinum_drive);
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