Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_disk.c
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1 /*- 2 * Copyright (c) 2002 Poul-Henning Kamp 3 * Copyright (c) 2002 Networks Associates Technology, Inc. 4 * All rights reserved. 5 * 6 * This software was developed for the FreeBSD Project by Poul-Henning Kamp 7 * and NAI Labs, the Security Research Division of Network Associates, Inc. 8 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 9 * DARPA CHATS research program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. The names of the authors may not be used to endorse or promote 20 * products derived from this software without specific prior written 21 * permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include "opt_geom.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/sysctl.h> 45 #include <sys/bio.h> 46 #include <sys/ctype.h> 47 #include <sys/fcntl.h> 48 #include <sys/malloc.h> 49 #include <sys/sbuf.h> 50 #include <sys/devicestat.h> 51 #include <machine/md_var.h> 52 53 #include <sys/lock.h> 54 #include <sys/mutex.h> 55 #include <geom/geom.h> 56 #include <geom/geom_disk.h> 57 #include <geom/geom_int.h> 58 59 #include <dev/led/led.h> 60 61 struct g_disk_softc { 62 struct mtx done_mtx; 63 struct disk *dp; 64 struct sysctl_ctx_list sysctl_ctx; 65 struct sysctl_oid *sysctl_tree; 66 char led[64]; 67 uint32_t state; 68 }; 69 70 static g_access_t g_disk_access; 71 static g_start_t g_disk_start; 72 static g_ioctl_t g_disk_ioctl; 73 static g_dumpconf_t g_disk_dumpconf; 74 static g_provgone_t g_disk_providergone; 75 76 static struct g_class g_disk_class = { 77 .name = "DISK", 78 .version = G_VERSION, 79 .start = g_disk_start, 80 .access = g_disk_access, 81 .ioctl = g_disk_ioctl, 82 .providergone = g_disk_providergone, 83 .dumpconf = g_disk_dumpconf, 84 }; 85 86 SYSCTL_DECL(_kern_geom); 87 static SYSCTL_NODE(_kern_geom, OID_AUTO, disk, CTLFLAG_RW, 0, 88 "GEOM_DISK stuff"); 89 90 DECLARE_GEOM_CLASS(g_disk_class, g_disk); 91 92 static void __inline 93 g_disk_lock_giant(struct disk *dp) 94 { 95 96 if (dp->d_flags & DISKFLAG_NEEDSGIANT) 97 mtx_lock(&Giant); 98 } 99 100 static void __inline 101 g_disk_unlock_giant(struct disk *dp) 102 { 103 104 if (dp->d_flags & DISKFLAG_NEEDSGIANT) 105 mtx_unlock(&Giant); 106 } 107 108 static int 109 g_disk_access(struct g_provider *pp, int r, int w, int e) 110 { 111 struct disk *dp; 112 struct g_disk_softc *sc; 113 int error; 114 115 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 116 pp->name, r, w, e); 117 g_topology_assert(); 118 sc = pp->private; 119 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) { 120 /* 121 * Allow decreasing access count even if disk is not 122 * avaliable anymore. 123 */ 124 if (r <= 0 && w <= 0 && e <= 0) 125 return (0); 126 return (ENXIO); 127 } 128 r += pp->acr; 129 w += pp->acw; 130 e += pp->ace; 131 error = 0; 132 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 133 if (dp->d_open != NULL) { 134 g_disk_lock_giant(dp); 135 error = dp->d_open(dp); 136 if (bootverbose && error != 0) 137 printf("Opened disk %s -> %d\n", 138 pp->name, error); 139 g_disk_unlock_giant(dp); 140 if (error != 0) 141 return (error); 142 } 143 pp->mediasize = dp->d_mediasize; 144 pp->sectorsize = dp->d_sectorsize; 145 if (dp->d_flags & DISKFLAG_CANDELETE) 146 pp->flags |= G_PF_CANDELETE; 147 else 148 pp->flags &= ~G_PF_CANDELETE; 149 pp->stripeoffset = dp->d_stripeoffset; 150 pp->stripesize = dp->d_stripesize; 151 dp->d_flags |= DISKFLAG_OPEN; 152 if (dp->d_maxsize == 0) { 153 printf("WARNING: Disk drive %s%d has no d_maxsize\n", 154 dp->d_name, dp->d_unit); 155 dp->d_maxsize = DFLTPHYS; 156 } 157 if (dp->d_delmaxsize == 0) { 158 if (bootverbose && dp->d_flags & DISKFLAG_CANDELETE) { 159 printf("WARNING: Disk drive %s%d has no " 160 "d_delmaxsize\n", dp->d_name, dp->d_unit); 161 } 162 dp->d_delmaxsize = dp->d_maxsize; 163 } 164 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 165 if (dp->d_close != NULL) { 166 g_disk_lock_giant(dp); 167 error = dp->d_close(dp); 168 if (error != 0) 169 printf("Closed disk %s -> %d\n", 170 pp->name, error); 171 g_disk_unlock_giant(dp); 172 } 173 sc->state = G_STATE_ACTIVE; 174 if (sc->led[0] != 0) 175 led_set(sc->led, ""); 176 dp->d_flags &= ~DISKFLAG_OPEN; 177 } 178 return (error); 179 } 180 181 static void 182 g_disk_kerneldump(struct bio *bp, struct disk *dp) 183 { 184 struct g_kerneldump *gkd; 185 struct g_geom *gp; 186 187 gkd = (struct g_kerneldump*)bp->bio_data; 188 gp = bp->bio_to->geom; 189 g_trace(G_T_TOPOLOGY, "g_disk_kerneldump(%s, %jd, %jd)", 190 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 191 if (dp->d_dump == NULL) { 192 g_io_deliver(bp, ENODEV); 193 return; 194 } 195 gkd->di.dumper = dp->d_dump; 196 gkd->di.priv = dp; 197 gkd->di.blocksize = dp->d_sectorsize; 198 gkd->di.maxiosize = dp->d_maxsize; 199 gkd->di.mediaoffset = gkd->offset; 200 if ((gkd->offset + gkd->length) > dp->d_mediasize) 201 gkd->length = dp->d_mediasize - gkd->offset; 202 gkd->di.mediasize = gkd->length; 203 g_io_deliver(bp, 0); 204 } 205 206 static void 207 g_disk_setstate(struct bio *bp, struct g_disk_softc *sc) 208 { 209 const char *cmd; 210 211 memcpy(&sc->state, bp->bio_data, sizeof(sc->state)); 212 if (sc->led[0] != 0) { 213 switch (sc->state) { 214 case G_STATE_FAILED: 215 cmd = "1"; 216 break; 217 case G_STATE_REBUILD: 218 cmd = "f5"; 219 break; 220 case G_STATE_RESYNC: 221 cmd = "f1"; 222 break; 223 default: 224 cmd = ""; 225 break; 226 } 227 led_set(sc->led, cmd); 228 } 229 g_io_deliver(bp, 0); 230 } 231 232 static void 233 g_disk_done(struct bio *bp) 234 { 235 struct bintime now; 236 struct bio *bp2; 237 struct g_disk_softc *sc; 238 239 /* See "notes" for why we need a mutex here */ 240 /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */ 241 bp2 = bp->bio_parent; 242 sc = bp2->bio_to->private; 243 bp->bio_completed = bp->bio_length - bp->bio_resid; 244 binuptime(&now); 245 mtx_lock(&sc->done_mtx); 246 if (bp2->bio_error == 0) 247 bp2->bio_error = bp->bio_error; 248 bp2->bio_completed += bp->bio_completed; 249 if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE)) != 0) 250 devstat_end_transaction_bio_bt(sc->dp->d_devstat, bp, &now); 251 bp2->bio_inbed++; 252 if (bp2->bio_children == bp2->bio_inbed) { 253 mtx_unlock(&sc->done_mtx); 254 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed; 255 g_io_deliver(bp2, bp2->bio_error); 256 } else 257 mtx_unlock(&sc->done_mtx); 258 g_destroy_bio(bp); 259 } 260 261 static int 262 g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td) 263 { 264 struct disk *dp; 265 struct g_disk_softc *sc; 266 int error; 267 268 sc = pp->private; 269 dp = sc->dp; 270 271 if (dp->d_ioctl == NULL) 272 return (ENOIOCTL); 273 g_disk_lock_giant(dp); 274 error = dp->d_ioctl(dp, cmd, data, fflag, td); 275 g_disk_unlock_giant(dp); 276 return (error); 277 } 278 279 static void 280 g_disk_start(struct bio *bp) 281 { 282 struct bio *bp2, *bp3; 283 struct disk *dp; 284 struct g_disk_softc *sc; 285 int error; 286 off_t off; 287 288 sc = bp->bio_to->private; 289 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) { 290 g_io_deliver(bp, ENXIO); 291 return; 292 } 293 error = EJUSTRETURN; 294 switch(bp->bio_cmd) { 295 case BIO_DELETE: 296 if (!(dp->d_flags & DISKFLAG_CANDELETE)) { 297 error = EOPNOTSUPP; 298 break; 299 } 300 /* fall-through */ 301 case BIO_READ: 302 case BIO_WRITE: 303 off = 0; 304 bp3 = NULL; 305 bp2 = g_clone_bio(bp); 306 if (bp2 == NULL) { 307 error = ENOMEM; 308 break; 309 } 310 do { 311 off_t d_maxsize; 312 313 d_maxsize = (bp->bio_cmd == BIO_DELETE && 314 (dp->d_flags & DISKFLAG_LACKS_DELMAX) == 0) ? 315 dp->d_delmaxsize : dp->d_maxsize; 316 317 bp2->bio_offset += off; 318 bp2->bio_length -= off; 319 if ((bp->bio_flags & BIO_UNMAPPED) == 0) { 320 bp2->bio_data += off; 321 } else { 322 KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO) 323 != 0, 324 ("unmapped bio not supported by disk %s", 325 dp->d_name)); 326 bp2->bio_ma += off / PAGE_SIZE; 327 bp2->bio_ma_offset += off; 328 bp2->bio_ma_offset %= PAGE_SIZE; 329 bp2->bio_ma_n -= off / PAGE_SIZE; 330 } 331 if (bp2->bio_length > d_maxsize) { 332 /* 333 * XXX: If we have a stripesize we should really 334 * use it here. Care should be taken in the delete 335 * case if this is done as deletes can be very 336 * sensitive to size given how they are processed. 337 */ 338 bp2->bio_length = d_maxsize; 339 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 340 bp2->bio_ma_n = howmany( 341 bp2->bio_ma_offset + 342 bp2->bio_length, PAGE_SIZE); 343 } 344 off += d_maxsize; 345 /* 346 * To avoid a race, we need to grab the next bio 347 * before we schedule this one. See "notes". 348 */ 349 bp3 = g_clone_bio(bp); 350 if (bp3 == NULL) 351 bp->bio_error = ENOMEM; 352 } 353 bp2->bio_done = g_disk_done; 354 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 355 bp2->bio_bcount = bp2->bio_length; 356 bp2->bio_disk = dp; 357 devstat_start_transaction_bio(dp->d_devstat, bp2); 358 g_disk_lock_giant(dp); 359 dp->d_strategy(bp2); 360 g_disk_unlock_giant(dp); 361 bp2 = bp3; 362 bp3 = NULL; 363 } while (bp2 != NULL); 364 break; 365 case BIO_GETATTR: 366 /* Give the driver a chance to override */ 367 if (dp->d_getattr != NULL) { 368 if (bp->bio_disk == NULL) 369 bp->bio_disk = dp; 370 error = dp->d_getattr(bp); 371 if (error != -1) 372 break; 373 error = EJUSTRETURN; 374 } 375 if (g_handleattr_int(bp, "GEOM::candelete", 376 (dp->d_flags & DISKFLAG_CANDELETE) != 0)) 377 break; 378 else if (g_handleattr_int(bp, "GEOM::fwsectors", 379 dp->d_fwsectors)) 380 break; 381 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 382 break; 383 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 384 break; 385 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident)) 386 break; 387 else if (g_handleattr(bp, "GEOM::hba_vendor", 388 &dp->d_hba_vendor, 2)) 389 break; 390 else if (g_handleattr(bp, "GEOM::hba_device", 391 &dp->d_hba_device, 2)) 392 break; 393 else if (g_handleattr(bp, "GEOM::hba_subvendor", 394 &dp->d_hba_subvendor, 2)) 395 break; 396 else if (g_handleattr(bp, "GEOM::hba_subdevice", 397 &dp->d_hba_subdevice, 2)) 398 break; 399 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 400 g_disk_kerneldump(bp, dp); 401 else if (!strcmp(bp->bio_attribute, "GEOM::setstate")) 402 g_disk_setstate(bp, sc); 403 else 404 error = ENOIOCTL; 405 break; 406 case BIO_FLUSH: 407 g_trace(G_T_BIO, "g_disk_flushcache(%s)", 408 bp->bio_to->name); 409 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) { 410 error = EOPNOTSUPP; 411 break; 412 } 413 bp2 = g_clone_bio(bp); 414 if (bp2 == NULL) { 415 g_io_deliver(bp, ENOMEM); 416 return; 417 } 418 bp2->bio_done = g_disk_done; 419 bp2->bio_disk = dp; 420 g_disk_lock_giant(dp); 421 dp->d_strategy(bp2); 422 g_disk_unlock_giant(dp); 423 break; 424 default: 425 error = EOPNOTSUPP; 426 break; 427 } 428 if (error != EJUSTRETURN) 429 g_io_deliver(bp, error); 430 return; 431 } 432 433 static void 434 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 435 { 436 struct bio *bp; 437 struct disk *dp; 438 struct g_disk_softc *sc; 439 char *buf; 440 int res = 0; 441 442 sc = gp->softc; 443 if (sc == NULL || (dp = sc->dp) == NULL) 444 return; 445 if (indent == NULL) { 446 sbuf_printf(sb, " hd %u", dp->d_fwheads); 447 sbuf_printf(sb, " sc %u", dp->d_fwsectors); 448 return; 449 } 450 if (pp != NULL) { 451 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", 452 indent, dp->d_fwheads); 453 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", 454 indent, dp->d_fwsectors); 455 if (dp->d_getattr != NULL) { 456 buf = g_malloc(DISK_IDENT_SIZE, M_WAITOK); 457 bp = g_alloc_bio(); 458 bp->bio_disk = dp; 459 bp->bio_attribute = "GEOM::ident"; 460 bp->bio_length = DISK_IDENT_SIZE; 461 bp->bio_data = buf; 462 res = dp->d_getattr(bp); 463 sbuf_printf(sb, "%s<ident>", indent); 464 g_conf_printf_escaped(sb, "%s", 465 res == 0 ? buf: dp->d_ident); 466 sbuf_printf(sb, "</ident>\n"); 467 bp->bio_attribute = "GEOM::lunid"; 468 bp->bio_length = DISK_IDENT_SIZE; 469 bp->bio_data = buf; 470 if (dp->d_getattr(bp) == 0) { 471 sbuf_printf(sb, "%s<lunid>", indent); 472 g_conf_printf_escaped(sb, "%s", buf); 473 sbuf_printf(sb, "</lunid>\n"); 474 } 475 bp->bio_attribute = "GEOM::lunname"; 476 bp->bio_length = DISK_IDENT_SIZE; 477 bp->bio_data = buf; 478 if (dp->d_getattr(bp) == 0) { 479 sbuf_printf(sb, "%s<lunname>", indent); 480 g_conf_printf_escaped(sb, "%s", buf); 481 sbuf_printf(sb, "</lunname>\n"); 482 } 483 g_destroy_bio(bp); 484 g_free(buf); 485 } else { 486 sbuf_printf(sb, "%s<ident>", indent); 487 g_conf_printf_escaped(sb, "%s", dp->d_ident); 488 sbuf_printf(sb, "</ident>\n"); 489 } 490 sbuf_printf(sb, "%s<descr>", indent); 491 g_conf_printf_escaped(sb, "%s", dp->d_descr); 492 sbuf_printf(sb, "</descr>\n"); 493 } 494 } 495 496 static void 497 g_disk_create(void *arg, int flag) 498 { 499 struct g_geom *gp; 500 struct g_provider *pp; 501 struct disk *dp; 502 struct g_disk_softc *sc; 503 char tmpstr[80]; 504 505 if (flag == EV_CANCEL) 506 return; 507 g_topology_assert(); 508 dp = arg; 509 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 510 mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF); 511 sc->dp = dp; 512 gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit); 513 gp->softc = sc; 514 pp = g_new_providerf(gp, "%s", gp->name); 515 pp->mediasize = dp->d_mediasize; 516 pp->sectorsize = dp->d_sectorsize; 517 if (dp->d_flags & DISKFLAG_CANDELETE) 518 pp->flags |= G_PF_CANDELETE; 519 pp->stripeoffset = dp->d_stripeoffset; 520 pp->stripesize = dp->d_stripesize; 521 if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0) 522 pp->flags |= G_PF_ACCEPT_UNMAPPED; 523 if (bootverbose) 524 printf("GEOM: new disk %s\n", gp->name); 525 sysctl_ctx_init(&sc->sysctl_ctx); 526 snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name); 527 sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx, 528 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name, 529 CTLFLAG_RD, 0, tmpstr); 530 if (sc->sysctl_tree != NULL) { 531 snprintf(tmpstr, sizeof(tmpstr), 532 "kern.geom.disk.%s.led", gp->name); 533 TUNABLE_STR_FETCH(tmpstr, sc->led, sizeof(sc->led)); 534 SYSCTL_ADD_STRING(&sc->sysctl_ctx, 535 SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led", 536 CTLFLAG_RW | CTLFLAG_TUN, sc->led, sizeof(sc->led), 537 "LED name"); 538 } 539 pp->private = sc; 540 dp->d_geom = gp; 541 g_error_provider(pp, 0); 542 } 543 544 /* 545 * We get this callback after all of the consumers have gone away, and just 546 * before the provider is freed. If the disk driver provided a d_gone 547 * callback, let them know that it is okay to free resources -- they won't 548 * be getting any more accesses from GEOM. 549 */ 550 static void 551 g_disk_providergone(struct g_provider *pp) 552 { 553 struct disk *dp; 554 struct g_disk_softc *sc; 555 556 sc = (struct g_disk_softc *)pp->private; 557 dp = sc->dp; 558 559 /* 560 * FreeBSD 9 started with VERSION_01 of the struct disk structure. 561 * However, g_gone was added in the middle of the branch. To 562 * cope with version being missing from struct disk, we set a flag 563 * in g_disk_create for VERSION_01 and avoid touching the d_gone 564 * field for old consumers. 565 */ 566 if (dp != NULL && (dp->d_flags & DISKFLAG_LACKS_GONE) == 0 && 567 dp->d_gone != NULL) 568 dp->d_gone(dp); 569 if (sc->sysctl_tree != NULL) { 570 sysctl_ctx_free(&sc->sysctl_ctx); 571 sc->sysctl_tree = NULL; 572 } 573 if (sc->led[0] != 0) { 574 led_set(sc->led, ""); 575 sc->led[0] = 0; 576 } 577 pp->private = NULL; 578 pp->geom->softc = NULL; 579 mtx_destroy(&sc->done_mtx); 580 g_free(sc); 581 } 582 583 static void 584 g_disk_destroy(void *ptr, int flag) 585 { 586 struct disk *dp; 587 struct g_geom *gp; 588 struct g_disk_softc *sc; 589 590 g_topology_assert(); 591 dp = ptr; 592 gp = dp->d_geom; 593 if (gp != NULL) { 594 sc = gp->softc; 595 if (sc != NULL) 596 sc->dp = NULL; 597 dp->d_geom = NULL; 598 g_wither_geom(gp, ENXIO); 599 } 600 g_free(dp); 601 } 602 603 /* 604 * We only allow printable characters in disk ident, 605 * the rest is converted to 'x<HH>'. 606 */ 607 static void 608 g_disk_ident_adjust(char *ident, size_t size) 609 { 610 char *p, tmp[4], newid[DISK_IDENT_SIZE]; 611 612 newid[0] = '\0'; 613 for (p = ident; *p != '\0'; p++) { 614 if (isprint(*p)) { 615 tmp[0] = *p; 616 tmp[1] = '\0'; 617 } else { 618 snprintf(tmp, sizeof(tmp), "x%02hhx", 619 *(unsigned char *)p); 620 } 621 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid)) 622 break; 623 } 624 bzero(ident, size); 625 strlcpy(ident, newid, size); 626 } 627 628 struct disk * 629 disk_alloc(void) 630 { 631 632 return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO)); 633 } 634 635 void 636 disk_create(struct disk *dp, int version) 637 { 638 639 if (version != DISK_VERSION_03 && version != DISK_VERSION_02 && 640 version != DISK_VERSION_01) { 641 printf("WARNING: Attempt to add disk %s%d %s", 642 dp->d_name, dp->d_unit, 643 " using incompatible ABI version of disk(9)\n"); 644 printf("WARNING: Ignoring disk %s%d\n", 645 dp->d_name, dp->d_unit); 646 return; 647 } 648 if (version == DISK_VERSION_01) 649 dp->d_flags |= DISKFLAG_LACKS_GONE; 650 if (version < DISK_VERSION_03) 651 dp->d_flags |= DISKFLAG_LACKS_DELMAX; 652 KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy")); 653 KASSERT(dp->d_name != NULL, ("disk_create need d_name")); 654 KASSERT(*dp->d_name != 0, ("disk_create need d_name")); 655 KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long")); 656 if (dp->d_devstat == NULL) 657 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit, 658 dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED, 659 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 660 dp->d_geom = NULL; 661 g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident)); 662 g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL); 663 } 664 665 void 666 disk_destroy(struct disk *dp) 667 { 668 669 g_cancel_event(dp); 670 dp->d_destroyed = 1; 671 if (dp->d_devstat != NULL) 672 devstat_remove_entry(dp->d_devstat); 673 g_post_event(g_disk_destroy, dp, M_WAITOK, NULL); 674 } 675 676 void 677 disk_gone(struct disk *dp) 678 { 679 struct g_geom *gp; 680 struct g_provider *pp; 681 682 gp = dp->d_geom; 683 if (gp != NULL) { 684 pp = LIST_FIRST(&gp->provider); 685 if (pp != NULL) { 686 KASSERT(LIST_NEXT(pp, provider) == NULL, 687 ("geom %p has more than one provider", gp)); 688 g_wither_provider(pp, ENXIO); 689 } 690 } 691 } 692 693 void 694 disk_attr_changed(struct disk *dp, const char *attr, int flag) 695 { 696 struct g_geom *gp; 697 struct g_provider *pp; 698 699 gp = dp->d_geom; 700 if (gp != NULL) 701 LIST_FOREACH(pp, &gp->provider, provider) 702 (void)g_attr_changed(pp, attr, flag); 703 } 704 705 void 706 disk_media_changed(struct disk *dp, int flag) 707 { 708 struct g_geom *gp; 709 struct g_provider *pp; 710 711 gp = dp->d_geom; 712 if (gp != NULL) { 713 pp = LIST_FIRST(&gp->provider); 714 if (pp != NULL) { 715 KASSERT(LIST_NEXT(pp, provider) == NULL, 716 ("geom %p has more than one provider", gp)); 717 g_media_changed(pp, flag); 718 } 719 } 720 } 721 722 void 723 disk_media_gone(struct disk *dp, int flag) 724 { 725 struct g_geom *gp; 726 struct g_provider *pp; 727 728 gp = dp->d_geom; 729 if (gp != NULL) { 730 pp = LIST_FIRST(&gp->provider); 731 if (pp != NULL) { 732 KASSERT(LIST_NEXT(pp, provider) == NULL, 733 ("geom %p has more than one provider", gp)); 734 g_media_gone(pp, flag); 735 } 736 } 737 } 738 739 static void 740 g_kern_disks(void *p, int flag __unused) 741 { 742 struct sbuf *sb; 743 struct g_geom *gp; 744 char *sp; 745 746 sb = p; 747 sp = ""; 748 g_topology_assert(); 749 LIST_FOREACH(gp, &g_disk_class.geom, geom) { 750 sbuf_printf(sb, "%s%s", sp, gp->name); 751 sp = " "; 752 } 753 sbuf_finish(sb); 754 } 755 756 static int 757 sysctl_disks(SYSCTL_HANDLER_ARGS) 758 { 759 int error; 760 struct sbuf *sb; 761 762 sb = sbuf_new_auto(); 763 g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL); 764 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 765 sbuf_delete(sb); 766 return error; 767 } 768 769 SYSCTL_PROC(_kern, OID_AUTO, disks, 770 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 771 sysctl_disks, "A", "names of available disks");
Cache object: 33a668c69f3602ed68045d40c8c50a24
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