geom_disk.c revision 267961
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: head/sys/geom/geom_disk.c 267961 2014-06-27 16:33:43Z hselasky $"); 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 61struct 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 struct mtx start_mtx; 69}; 70 71static g_access_t g_disk_access; 72static g_start_t g_disk_start; 73static g_ioctl_t g_disk_ioctl; 74static g_dumpconf_t g_disk_dumpconf; 75static g_provgone_t g_disk_providergone; 76 77static struct g_class g_disk_class = { 78 .name = G_DISK_CLASS_NAME, 79 .version = G_VERSION, 80 .start = g_disk_start, 81 .access = g_disk_access, 82 .ioctl = g_disk_ioctl, 83 .providergone = g_disk_providergone, 84 .dumpconf = g_disk_dumpconf, 85}; 86 87SYSCTL_DECL(_kern_geom); 88static SYSCTL_NODE(_kern_geom, OID_AUTO, disk, CTLFLAG_RW, 0, 89 "GEOM_DISK stuff"); 90 91DECLARE_GEOM_CLASS(g_disk_class, g_disk); 92 93static int 94g_disk_access(struct g_provider *pp, int r, int w, int e) 95{ 96 struct disk *dp; 97 struct g_disk_softc *sc; 98 int error; 99 100 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 101 pp->name, r, w, e); 102 g_topology_assert(); 103 sc = pp->private; 104 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) { 105 /* 106 * Allow decreasing access count even if disk is not 107 * avaliable anymore. 108 */ 109 if (r <= 0 && w <= 0 && e <= 0) 110 return (0); 111 return (ENXIO); 112 } 113 r += pp->acr; 114 w += pp->acw; 115 e += pp->ace; 116 error = 0; 117 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 118 if (dp->d_open != NULL) { 119 error = dp->d_open(dp); 120 if (bootverbose && error != 0) 121 printf("Opened disk %s -> %d\n", 122 pp->name, error); 123 if (error != 0) 124 return (error); 125 } 126 pp->mediasize = dp->d_mediasize; 127 pp->sectorsize = dp->d_sectorsize; 128 if (dp->d_maxsize == 0) { 129 printf("WARNING: Disk drive %s%d has no d_maxsize\n", 130 dp->d_name, dp->d_unit); 131 dp->d_maxsize = DFLTPHYS; 132 } 133 if (dp->d_delmaxsize == 0) { 134 if (bootverbose && dp->d_flags & DISKFLAG_CANDELETE) { 135 printf("WARNING: Disk drive %s%d has no " 136 "d_delmaxsize\n", dp->d_name, dp->d_unit); 137 } 138 dp->d_delmaxsize = dp->d_maxsize; 139 } 140 pp->stripeoffset = dp->d_stripeoffset; 141 pp->stripesize = dp->d_stripesize; 142 dp->d_flags |= DISKFLAG_OPEN; 143 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 144 if (dp->d_close != NULL) { 145 error = dp->d_close(dp); 146 if (error != 0) 147 printf("Closed disk %s -> %d\n", 148 pp->name, error); 149 } 150 sc->state = G_STATE_ACTIVE; 151 if (sc->led[0] != 0) 152 led_set(sc->led, "0"); 153 dp->d_flags &= ~DISKFLAG_OPEN; 154 } 155 return (error); 156} 157 158static void 159g_disk_kerneldump(struct bio *bp, struct disk *dp) 160{ 161 struct g_kerneldump *gkd; 162 struct g_geom *gp; 163 164 gkd = (struct g_kerneldump*)bp->bio_data; 165 gp = bp->bio_to->geom; 166 g_trace(G_T_TOPOLOGY, "g_disk_kerneldump(%s, %jd, %jd)", 167 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 168 if (dp->d_dump == NULL) { 169 g_io_deliver(bp, ENODEV); 170 return; 171 } 172 gkd->di.dumper = dp->d_dump; 173 gkd->di.priv = dp; 174 gkd->di.blocksize = dp->d_sectorsize; 175 gkd->di.maxiosize = dp->d_maxsize; 176 gkd->di.mediaoffset = gkd->offset; 177 if ((gkd->offset + gkd->length) > dp->d_mediasize) 178 gkd->length = dp->d_mediasize - gkd->offset; 179 gkd->di.mediasize = gkd->length; 180 g_io_deliver(bp, 0); 181} 182 183static void 184g_disk_setstate(struct bio *bp, struct g_disk_softc *sc) 185{ 186 const char *cmd; 187 188 memcpy(&sc->state, bp->bio_data, sizeof(sc->state)); 189 if (sc->led[0] != 0) { 190 switch (sc->state) { 191 case G_STATE_FAILED: 192 cmd = "1"; 193 break; 194 case G_STATE_REBUILD: 195 cmd = "f5"; 196 break; 197 case G_STATE_RESYNC: 198 cmd = "f1"; 199 break; 200 default: 201 cmd = "0"; 202 break; 203 } 204 led_set(sc->led, cmd); 205 } 206 g_io_deliver(bp, 0); 207} 208 209static void 210g_disk_done(struct bio *bp) 211{ 212 struct bintime now; 213 struct bio *bp2; 214 struct g_disk_softc *sc; 215 216 /* See "notes" for why we need a mutex here */ 217 /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */ 218 bp2 = bp->bio_parent; 219 sc = bp2->bio_to->private; 220 bp->bio_completed = bp->bio_length - bp->bio_resid; 221 binuptime(&now); 222 mtx_lock(&sc->done_mtx); 223 if (bp2->bio_error == 0) 224 bp2->bio_error = bp->bio_error; 225 bp2->bio_completed += bp->bio_completed; 226 if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE|BIO_FLUSH)) != 0) 227 devstat_end_transaction_bio_bt(sc->dp->d_devstat, bp, &now); 228 bp2->bio_inbed++; 229 if (bp2->bio_children == bp2->bio_inbed) { 230 mtx_unlock(&sc->done_mtx); 231 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed; 232 g_io_deliver(bp2, bp2->bio_error); 233 } else 234 mtx_unlock(&sc->done_mtx); 235 g_destroy_bio(bp); 236} 237 238static void 239g_disk_done_single(struct bio *bp) 240{ 241 struct bintime now; 242 struct g_disk_softc *sc; 243 244 bp->bio_completed = bp->bio_length - bp->bio_resid; 245 bp->bio_done = (void *)bp->bio_to; 246 bp->bio_to = LIST_FIRST(&bp->bio_disk->d_geom->provider); 247 if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE|BIO_FLUSH)) != 0) { 248 binuptime(&now); 249 sc = bp->bio_to->private; 250 mtx_lock(&sc->done_mtx); 251 devstat_end_transaction_bio_bt(sc->dp->d_devstat, bp, &now); 252 mtx_unlock(&sc->done_mtx); 253 } 254 g_io_deliver(bp, bp->bio_error); 255} 256 257static int 258g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td) 259{ 260 struct disk *dp; 261 struct g_disk_softc *sc; 262 int error; 263 264 sc = pp->private; 265 dp = sc->dp; 266 267 if (dp->d_ioctl == NULL) 268 return (ENOIOCTL); 269 error = dp->d_ioctl(dp, cmd, data, fflag, td); 270 return (error); 271} 272 273static void 274g_disk_start(struct bio *bp) 275{ 276 struct bio *bp2, *bp3; 277 struct disk *dp; 278 struct g_disk_softc *sc; 279 int error; 280 off_t d_maxsize, off; 281 282 sc = bp->bio_to->private; 283 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) { 284 g_io_deliver(bp, ENXIO); 285 return; 286 } 287 error = EJUSTRETURN; 288 switch(bp->bio_cmd) { 289 case BIO_DELETE: 290 if (!(dp->d_flags & DISKFLAG_CANDELETE)) { 291 error = EOPNOTSUPP; 292 break; 293 } 294 /* fall-through */ 295 case BIO_READ: 296 case BIO_WRITE: 297 d_maxsize = (bp->bio_cmd == BIO_DELETE) ? 298 dp->d_delmaxsize : dp->d_maxsize; 299 if (bp->bio_length <= d_maxsize) { 300 bp->bio_disk = dp; 301 bp->bio_to = (void *)bp->bio_done; 302 bp->bio_done = g_disk_done_single; 303 bp->bio_pblkno = bp->bio_offset / dp->d_sectorsize; 304 bp->bio_bcount = bp->bio_length; 305 mtx_lock(&sc->start_mtx); 306 devstat_start_transaction_bio(dp->d_devstat, bp); 307 mtx_unlock(&sc->start_mtx); 308 dp->d_strategy(bp); 309 break; 310 } 311 off = 0; 312 bp3 = NULL; 313 bp2 = g_clone_bio(bp); 314 if (bp2 == NULL) { 315 error = ENOMEM; 316 break; 317 } 318 do { 319 bp2->bio_offset += off; 320 bp2->bio_length -= off; 321 if ((bp->bio_flags & BIO_UNMAPPED) == 0) { 322 bp2->bio_data += off; 323 } else { 324 KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO) 325 != 0, 326 ("unmapped bio not supported by disk %s", 327 dp->d_name)); 328 bp2->bio_ma += off / PAGE_SIZE; 329 bp2->bio_ma_offset += off; 330 bp2->bio_ma_offset %= PAGE_SIZE; 331 bp2->bio_ma_n -= off / PAGE_SIZE; 332 } 333 if (bp2->bio_length > d_maxsize) { 334 /* 335 * XXX: If we have a stripesize we should really 336 * use it here. Care should be taken in the delete 337 * case if this is done as deletes can be very 338 * sensitive to size given how they are processed. 339 */ 340 bp2->bio_length = d_maxsize; 341 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 342 bp2->bio_ma_n = howmany( 343 bp2->bio_ma_offset + 344 bp2->bio_length, PAGE_SIZE); 345 } 346 off += d_maxsize; 347 /* 348 * To avoid a race, we need to grab the next bio 349 * before we schedule this one. See "notes". 350 */ 351 bp3 = g_clone_bio(bp); 352 if (bp3 == NULL) 353 bp->bio_error = ENOMEM; 354 } 355 bp2->bio_done = g_disk_done; 356 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 357 bp2->bio_bcount = bp2->bio_length; 358 bp2->bio_disk = dp; 359 mtx_lock(&sc->start_mtx); 360 devstat_start_transaction_bio(dp->d_devstat, bp2); 361 mtx_unlock(&sc->start_mtx); 362 dp->d_strategy(bp2); 363 bp2 = bp3; 364 bp3 = NULL; 365 } while (bp2 != NULL); 366 break; 367 case BIO_GETATTR: 368 /* Give the driver a chance to override */ 369 if (dp->d_getattr != NULL) { 370 if (bp->bio_disk == NULL) 371 bp->bio_disk = dp; 372 error = dp->d_getattr(bp); 373 if (error != -1) 374 break; 375 error = EJUSTRETURN; 376 } 377 if (g_handleattr_int(bp, "GEOM::candelete", 378 (dp->d_flags & DISKFLAG_CANDELETE) != 0)) 379 break; 380 else if (g_handleattr_int(bp, "GEOM::fwsectors", 381 dp->d_fwsectors)) 382 break; 383 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 384 break; 385 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 386 break; 387 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident)) 388 break; 389 else if (g_handleattr_uint16_t(bp, "GEOM::hba_vendor", 390 dp->d_hba_vendor)) 391 break; 392 else if (g_handleattr_uint16_t(bp, "GEOM::hba_device", 393 dp->d_hba_device)) 394 break; 395 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subvendor", 396 dp->d_hba_subvendor)) 397 break; 398 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subdevice", 399 dp->d_hba_subdevice)) 400 break; 401 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 402 g_disk_kerneldump(bp, dp); 403 else if (!strcmp(bp->bio_attribute, "GEOM::setstate")) 404 g_disk_setstate(bp, sc); 405 else if (g_handleattr_uint16_t(bp, "GEOM::rotation_rate", 406 dp->d_rotation_rate)) 407 break; 408 else 409 error = ENOIOCTL; 410 break; 411 case BIO_FLUSH: 412 g_trace(G_T_BIO, "g_disk_flushcache(%s)", 413 bp->bio_to->name); 414 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) { 415 error = EOPNOTSUPP; 416 break; 417 } 418 bp->bio_disk = dp; 419 bp->bio_to = (void *)bp->bio_done; 420 bp->bio_done = g_disk_done_single; 421 mtx_lock(&sc->start_mtx); 422 devstat_start_transaction_bio(dp->d_devstat, bp); 423 mtx_unlock(&sc->start_mtx); 424 dp->d_strategy(bp); 425 break; 426 default: 427 error = EOPNOTSUPP; 428 break; 429 } 430 if (error != EJUSTRETURN) 431 g_io_deliver(bp, error); 432 return; 433} 434 435static void 436g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 437{ 438 struct bio *bp; 439 struct disk *dp; 440 struct g_disk_softc *sc; 441 char *buf; 442 int res = 0; 443 444 sc = gp->softc; 445 if (sc == NULL || (dp = sc->dp) == NULL) 446 return; 447 if (indent == NULL) { 448 sbuf_printf(sb, " hd %u", dp->d_fwheads); 449 sbuf_printf(sb, " sc %u", dp->d_fwsectors); 450 return; 451 } 452 if (pp != NULL) { 453 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", 454 indent, dp->d_fwheads); 455 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", 456 indent, dp->d_fwsectors); 457 if (dp->d_getattr != NULL) { 458 buf = g_malloc(DISK_IDENT_SIZE, M_WAITOK); 459 bp = g_alloc_bio(); 460 bp->bio_disk = dp; 461 bp->bio_attribute = "GEOM::ident"; 462 bp->bio_length = DISK_IDENT_SIZE; 463 bp->bio_data = buf; 464 res = dp->d_getattr(bp); 465 sbuf_printf(sb, "%s<ident>", indent); 466 g_conf_printf_escaped(sb, "%s", 467 res == 0 ? buf: dp->d_ident); 468 sbuf_printf(sb, "</ident>\n"); 469 bp->bio_attribute = "GEOM::lunid"; 470 bp->bio_length = DISK_IDENT_SIZE; 471 bp->bio_data = buf; 472 if (dp->d_getattr(bp) == 0) { 473 sbuf_printf(sb, "%s<lunid>", indent); 474 g_conf_printf_escaped(sb, "%s", buf); 475 sbuf_printf(sb, "</lunid>\n"); 476 } 477 bp->bio_attribute = "GEOM::lunname"; 478 bp->bio_length = DISK_IDENT_SIZE; 479 bp->bio_data = buf; 480 if (dp->d_getattr(bp) == 0) { 481 sbuf_printf(sb, "%s<lunname>", indent); 482 g_conf_printf_escaped(sb, "%s", buf); 483 sbuf_printf(sb, "</lunname>\n"); 484 } 485 g_destroy_bio(bp); 486 g_free(buf); 487 } else { 488 sbuf_printf(sb, "%s<ident>", indent); 489 g_conf_printf_escaped(sb, "%s", dp->d_ident); 490 sbuf_printf(sb, "</ident>\n"); 491 } 492 sbuf_printf(sb, "%s<descr>", indent); 493 g_conf_printf_escaped(sb, "%s", dp->d_descr); 494 sbuf_printf(sb, "</descr>\n"); 495 } 496} 497 498static void 499g_disk_resize(void *ptr, int flag) 500{ 501 struct disk *dp; 502 struct g_geom *gp; 503 struct g_provider *pp; 504 505 if (flag == EV_CANCEL) 506 return; 507 g_topology_assert(); 508 509 dp = ptr; 510 gp = dp->d_geom; 511 512 if (dp->d_destroyed || gp == NULL) 513 return; 514 515 LIST_FOREACH(pp, &gp->provider, provider) { 516 if (pp->sectorsize != 0 && 517 pp->sectorsize != dp->d_sectorsize) 518 g_wither_provider(pp, ENXIO); 519 else 520 g_resize_provider(pp, dp->d_mediasize); 521 } 522} 523 524static void 525g_disk_create(void *arg, int flag) 526{ 527 struct g_geom *gp; 528 struct g_provider *pp; 529 struct disk *dp; 530 struct g_disk_softc *sc; 531 char tmpstr[80]; 532 533 if (flag == EV_CANCEL) 534 return; 535 g_topology_assert(); 536 dp = arg; 537 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 538 mtx_init(&sc->start_mtx, "g_disk_start", NULL, MTX_DEF); 539 mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF); 540 sc->dp = dp; 541 gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit); 542 gp->softc = sc; 543 pp = g_new_providerf(gp, "%s", gp->name); 544 devstat_remove_entry(pp->stat); 545 pp->stat = NULL; 546 dp->d_devstat->id = pp; 547 pp->mediasize = dp->d_mediasize; 548 pp->sectorsize = dp->d_sectorsize; 549 pp->stripeoffset = dp->d_stripeoffset; 550 pp->stripesize = dp->d_stripesize; 551 if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0) 552 pp->flags |= G_PF_ACCEPT_UNMAPPED; 553 if ((dp->d_flags & DISKFLAG_DIRECT_COMPLETION) != 0) 554 pp->flags |= G_PF_DIRECT_SEND; 555 pp->flags |= G_PF_DIRECT_RECEIVE; 556 if (bootverbose) 557 printf("GEOM: new disk %s\n", gp->name); 558 sysctl_ctx_init(&sc->sysctl_ctx); 559 snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name); 560 sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx, 561 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name, 562 CTLFLAG_RD, 0, tmpstr); 563 if (sc->sysctl_tree != NULL) { 564 SYSCTL_ADD_STRING(&sc->sysctl_ctx, 565 SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led", 566 CTLFLAG_RWTUN, sc->led, sizeof(sc->led), 567 "LED name"); 568 } 569 pp->private = sc; 570 dp->d_geom = gp; 571 g_error_provider(pp, 0); 572} 573 574/* 575 * We get this callback after all of the consumers have gone away, and just 576 * before the provider is freed. If the disk driver provided a d_gone 577 * callback, let them know that it is okay to free resources -- they won't 578 * be getting any more accesses from GEOM. 579 */ 580static void 581g_disk_providergone(struct g_provider *pp) 582{ 583 struct disk *dp; 584 struct g_disk_softc *sc; 585 586 sc = (struct g_disk_softc *)pp->private; 587 dp = sc->dp; 588 if (dp != NULL && dp->d_gone != NULL) 589 dp->d_gone(dp); 590 if (sc->sysctl_tree != NULL) { 591 sysctl_ctx_free(&sc->sysctl_ctx); 592 sc->sysctl_tree = NULL; 593 } 594 if (sc->led[0] != 0) { 595 led_set(sc->led, "0"); 596 sc->led[0] = 0; 597 } 598 pp->private = NULL; 599 pp->geom->softc = NULL; 600 mtx_destroy(&sc->done_mtx); 601 mtx_destroy(&sc->start_mtx); 602 g_free(sc); 603} 604 605static void 606g_disk_destroy(void *ptr, int flag) 607{ 608 struct disk *dp; 609 struct g_geom *gp; 610 struct g_disk_softc *sc; 611 612 g_topology_assert(); 613 dp = ptr; 614 gp = dp->d_geom; 615 if (gp != NULL) { 616 sc = gp->softc; 617 if (sc != NULL) 618 sc->dp = NULL; 619 dp->d_geom = NULL; 620 g_wither_geom(gp, ENXIO); 621 } 622 g_free(dp); 623} 624 625/* 626 * We only allow printable characters in disk ident, 627 * the rest is converted to 'x<HH>'. 628 */ 629static void 630g_disk_ident_adjust(char *ident, size_t size) 631{ 632 char *p, tmp[4], newid[DISK_IDENT_SIZE]; 633 634 newid[0] = '\0'; 635 for (p = ident; *p != '\0'; p++) { 636 if (isprint(*p)) { 637 tmp[0] = *p; 638 tmp[1] = '\0'; 639 } else { 640 snprintf(tmp, sizeof(tmp), "x%02hhx", 641 *(unsigned char *)p); 642 } 643 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid)) 644 break; 645 } 646 bzero(ident, size); 647 strlcpy(ident, newid, size); 648} 649 650struct disk * 651disk_alloc(void) 652{ 653 654 return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO)); 655} 656 657void 658disk_create(struct disk *dp, int version) 659{ 660 661 if (version != DISK_VERSION) { 662 printf("WARNING: Attempt to add disk %s%d %s", 663 dp->d_name, dp->d_unit, 664 " using incompatible ABI version of disk(9)\n"); 665 printf("WARNING: Ignoring disk %s%d\n", 666 dp->d_name, dp->d_unit); 667 return; 668 } 669 if (dp->d_flags & DISKFLAG_RESERVED) { 670 printf("WARNING: Attempt to add non-MPSAFE disk %s%d\n", 671 dp->d_name, dp->d_unit); 672 printf("WARNING: Ignoring disk %s%d\n", 673 dp->d_name, dp->d_unit); 674 return; 675 } 676 KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy")); 677 KASSERT(dp->d_name != NULL, ("disk_create need d_name")); 678 KASSERT(*dp->d_name != 0, ("disk_create need d_name")); 679 KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long")); 680 if (dp->d_devstat == NULL) 681 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit, 682 dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED, 683 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 684 dp->d_geom = NULL; 685 g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident)); 686 g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL); 687} 688 689void 690disk_destroy(struct disk *dp) 691{ 692 693 g_cancel_event(dp); 694 dp->d_destroyed = 1; 695 if (dp->d_devstat != NULL) 696 devstat_remove_entry(dp->d_devstat); 697 g_post_event(g_disk_destroy, dp, M_WAITOK, NULL); 698} 699 700void 701disk_gone(struct disk *dp) 702{ 703 struct g_geom *gp; 704 struct g_provider *pp; 705 706 gp = dp->d_geom; 707 if (gp != NULL) { 708 pp = LIST_FIRST(&gp->provider); 709 if (pp != NULL) { 710 KASSERT(LIST_NEXT(pp, provider) == NULL, 711 ("geom %p has more than one provider", gp)); 712 g_wither_provider(pp, ENXIO); 713 } 714 } 715} 716 717void 718disk_attr_changed(struct disk *dp, const char *attr, int flag) 719{ 720 struct g_geom *gp; 721 struct g_provider *pp; 722 723 gp = dp->d_geom; 724 if (gp != NULL) 725 LIST_FOREACH(pp, &gp->provider, provider) 726 (void)g_attr_changed(pp, attr, flag); 727} 728 729void 730disk_media_changed(struct disk *dp, int flag) 731{ 732 struct g_geom *gp; 733 struct g_provider *pp; 734 735 gp = dp->d_geom; 736 if (gp != NULL) { 737 pp = LIST_FIRST(&gp->provider); 738 if (pp != NULL) { 739 KASSERT(LIST_NEXT(pp, provider) == NULL, 740 ("geom %p has more than one provider", gp)); 741 g_media_changed(pp, flag); 742 } 743 } 744} 745 746void 747disk_media_gone(struct disk *dp, int flag) 748{ 749 struct g_geom *gp; 750 struct g_provider *pp; 751 752 gp = dp->d_geom; 753 if (gp != NULL) { 754 pp = LIST_FIRST(&gp->provider); 755 if (pp != NULL) { 756 KASSERT(LIST_NEXT(pp, provider) == NULL, 757 ("geom %p has more than one provider", gp)); 758 g_media_gone(pp, flag); 759 } 760 } 761} 762 763int 764disk_resize(struct disk *dp, int flag) 765{ 766 767 if (dp->d_destroyed || dp->d_geom == NULL) 768 return (0); 769 770 return (g_post_event(g_disk_resize, dp, flag, NULL)); 771} 772 773static void 774g_kern_disks(void *p, int flag __unused) 775{ 776 struct sbuf *sb; 777 struct g_geom *gp; 778 char *sp; 779 780 sb = p; 781 sp = ""; 782 g_topology_assert(); 783 LIST_FOREACH(gp, &g_disk_class.geom, geom) { 784 sbuf_printf(sb, "%s%s", sp, gp->name); 785 sp = " "; 786 } 787 sbuf_finish(sb); 788} 789 790static int 791sysctl_disks(SYSCTL_HANDLER_ARGS) 792{ 793 int error; 794 struct sbuf *sb; 795 796 sb = sbuf_new_auto(); 797 g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL); 798 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 799 sbuf_delete(sb); 800 return error; 801} 802 803SYSCTL_PROC(_kern, OID_AUTO, disks, 804 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 805 sysctl_disks, "A", "names of available disks"); 806