geom_disk.c revision 271238
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: stable/10/sys/geom/geom_disk.c 271238 2014-09-07 21:30:47Z smh $"); 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 void __inline 94g_disk_lock_giant(struct disk *dp) 95{ 96 97 if (dp->d_flags & DISKFLAG_NEEDSGIANT) 98 mtx_lock(&Giant); 99} 100 101static void __inline 102g_disk_unlock_giant(struct disk *dp) 103{ 104 105 if (dp->d_flags & DISKFLAG_NEEDSGIANT) 106 mtx_unlock(&Giant); 107} 108 109static int 110g_disk_access(struct g_provider *pp, int r, int w, int e) 111{ 112 struct disk *dp; 113 struct g_disk_softc *sc; 114 int error; 115 116 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 117 pp->name, r, w, e); 118 g_topology_assert(); 119 sc = pp->private; 120 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) { 121 /* 122 * Allow decreasing access count even if disk is not 123 * avaliable anymore. 124 */ 125 if (r <= 0 && w <= 0 && e <= 0) 126 return (0); 127 return (ENXIO); 128 } 129 r += pp->acr; 130 w += pp->acw; 131 e += pp->ace; 132 error = 0; 133 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 134 if (dp->d_open != NULL) { 135 g_disk_lock_giant(dp); 136 error = dp->d_open(dp); 137 if (bootverbose && error != 0) 138 printf("Opened disk %s -> %d\n", 139 pp->name, error); 140 g_disk_unlock_giant(dp); 141 if (error != 0) 142 return (error); 143 } 144 pp->mediasize = dp->d_mediasize; 145 pp->sectorsize = dp->d_sectorsize; 146 if (dp->d_maxsize == 0) { 147 printf("WARNING: Disk drive %s%d has no d_maxsize\n", 148 dp->d_name, dp->d_unit); 149 dp->d_maxsize = DFLTPHYS; 150 } 151 if (dp->d_delmaxsize == 0) { 152 if (bootverbose && dp->d_flags & DISKFLAG_CANDELETE) { 153 printf("WARNING: Disk drive %s%d has no " 154 "d_delmaxsize\n", dp->d_name, dp->d_unit); 155 } 156 dp->d_delmaxsize = dp->d_maxsize; 157 } 158 pp->stripeoffset = dp->d_stripeoffset; 159 pp->stripesize = dp->d_stripesize; 160 dp->d_flags |= DISKFLAG_OPEN; 161 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 162 if (dp->d_close != NULL) { 163 g_disk_lock_giant(dp); 164 error = dp->d_close(dp); 165 if (error != 0) 166 printf("Closed disk %s -> %d\n", 167 pp->name, error); 168 g_disk_unlock_giant(dp); 169 } 170 sc->state = G_STATE_ACTIVE; 171 if (sc->led[0] != 0) 172 led_set(sc->led, "0"); 173 dp->d_flags &= ~DISKFLAG_OPEN; 174 } 175 return (error); 176} 177 178static void 179g_disk_kerneldump(struct bio *bp, struct disk *dp) 180{ 181 struct g_kerneldump *gkd; 182 struct g_geom *gp; 183 184 gkd = (struct g_kerneldump*)bp->bio_data; 185 gp = bp->bio_to->geom; 186 g_trace(G_T_TOPOLOGY, "g_disk_kerneldump(%s, %jd, %jd)", 187 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 188 if (dp->d_dump == NULL) { 189 g_io_deliver(bp, ENODEV); 190 return; 191 } 192 gkd->di.dumper = dp->d_dump; 193 gkd->di.priv = dp; 194 gkd->di.blocksize = dp->d_sectorsize; 195 gkd->di.maxiosize = dp->d_maxsize; 196 gkd->di.mediaoffset = gkd->offset; 197 if ((gkd->offset + gkd->length) > dp->d_mediasize) 198 gkd->length = dp->d_mediasize - gkd->offset; 199 gkd->di.mediasize = gkd->length; 200 g_io_deliver(bp, 0); 201} 202 203static void 204g_disk_setstate(struct bio *bp, struct g_disk_softc *sc) 205{ 206 const char *cmd; 207 208 memcpy(&sc->state, bp->bio_data, sizeof(sc->state)); 209 if (sc->led[0] != 0) { 210 switch (sc->state) { 211 case G_STATE_FAILED: 212 cmd = "1"; 213 break; 214 case G_STATE_REBUILD: 215 cmd = "f5"; 216 break; 217 case G_STATE_RESYNC: 218 cmd = "f1"; 219 break; 220 default: 221 cmd = "0"; 222 break; 223 } 224 led_set(sc->led, cmd); 225 } 226 g_io_deliver(bp, 0); 227} 228 229static void 230g_disk_done(struct bio *bp) 231{ 232 struct bintime now; 233 struct bio *bp2; 234 struct g_disk_softc *sc; 235 236 /* See "notes" for why we need a mutex here */ 237 /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */ 238 bp2 = bp->bio_parent; 239 sc = bp2->bio_to->private; 240 bp->bio_completed = bp->bio_length - bp->bio_resid; 241 binuptime(&now); 242 mtx_lock(&sc->done_mtx); 243 if (bp2->bio_error == 0) 244 bp2->bio_error = bp->bio_error; 245 bp2->bio_completed += bp->bio_completed; 246 if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE|BIO_FLUSH)) != 0) 247 devstat_end_transaction_bio_bt(sc->dp->d_devstat, bp, &now); 248 bp2->bio_inbed++; 249 if (bp2->bio_children == bp2->bio_inbed) { 250 mtx_unlock(&sc->done_mtx); 251 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed; 252 g_io_deliver(bp2, bp2->bio_error); 253 } else 254 mtx_unlock(&sc->done_mtx); 255 g_destroy_bio(bp); 256} 257 258static void 259g_disk_done_single(struct bio *bp) 260{ 261 struct bintime now; 262 struct g_disk_softc *sc; 263 264 bp->bio_completed = bp->bio_length - bp->bio_resid; 265 bp->bio_done = (void *)bp->bio_to; 266 bp->bio_to = LIST_FIRST(&bp->bio_disk->d_geom->provider); 267 if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE|BIO_FLUSH)) != 0) { 268 binuptime(&now); 269 sc = bp->bio_to->private; 270 mtx_lock(&sc->done_mtx); 271 devstat_end_transaction_bio_bt(sc->dp->d_devstat, bp, &now); 272 mtx_unlock(&sc->done_mtx); 273 } 274 g_io_deliver(bp, bp->bio_error); 275} 276 277static int 278g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td) 279{ 280 struct disk *dp; 281 struct g_disk_softc *sc; 282 int error; 283 284 sc = pp->private; 285 dp = sc->dp; 286 287 if (dp->d_ioctl == NULL) 288 return (ENOIOCTL); 289 g_disk_lock_giant(dp); 290 error = dp->d_ioctl(dp, cmd, data, fflag, td); 291 g_disk_unlock_giant(dp); 292 return (error); 293} 294 295static void 296g_disk_start(struct bio *bp) 297{ 298 struct bio *bp2, *bp3; 299 struct disk *dp; 300 struct g_disk_softc *sc; 301 int error; 302 off_t d_maxsize, off; 303 304 sc = bp->bio_to->private; 305 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) { 306 g_io_deliver(bp, ENXIO); 307 return; 308 } 309 error = EJUSTRETURN; 310 switch(bp->bio_cmd) { 311 case BIO_DELETE: 312 if (!(dp->d_flags & DISKFLAG_CANDELETE)) { 313 error = EOPNOTSUPP; 314 break; 315 } 316 /* fall-through */ 317 case BIO_READ: 318 case BIO_WRITE: 319 d_maxsize = (bp->bio_cmd == BIO_DELETE) ? 320 dp->d_delmaxsize : dp->d_maxsize; 321 if (bp->bio_length <= d_maxsize) { 322 bp->bio_disk = dp; 323 bp->bio_to = (void *)bp->bio_done; 324 bp->bio_done = g_disk_done_single; 325 bp->bio_pblkno = bp->bio_offset / dp->d_sectorsize; 326 bp->bio_bcount = bp->bio_length; 327 mtx_lock(&sc->start_mtx); 328 devstat_start_transaction_bio(dp->d_devstat, bp); 329 mtx_unlock(&sc->start_mtx); 330 g_disk_lock_giant(dp); 331 dp->d_strategy(bp); 332 g_disk_unlock_giant(dp); 333 break; 334 } 335 off = 0; 336 bp3 = NULL; 337 bp2 = g_clone_bio(bp); 338 if (bp2 == NULL) { 339 error = ENOMEM; 340 break; 341 } 342 do { 343 bp2->bio_offset += off; 344 bp2->bio_length -= off; 345 if ((bp->bio_flags & BIO_UNMAPPED) == 0) { 346 bp2->bio_data += off; 347 } else { 348 KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO) 349 != 0, 350 ("unmapped bio not supported by disk %s", 351 dp->d_name)); 352 bp2->bio_ma += off / PAGE_SIZE; 353 bp2->bio_ma_offset += off; 354 bp2->bio_ma_offset %= PAGE_SIZE; 355 bp2->bio_ma_n -= off / PAGE_SIZE; 356 } 357 if (bp2->bio_length > d_maxsize) { 358 /* 359 * XXX: If we have a stripesize we should really 360 * use it here. Care should be taken in the delete 361 * case if this is done as deletes can be very 362 * sensitive to size given how they are processed. 363 */ 364 bp2->bio_length = d_maxsize; 365 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 366 bp2->bio_ma_n = howmany( 367 bp2->bio_ma_offset + 368 bp2->bio_length, PAGE_SIZE); 369 } 370 off += d_maxsize; 371 /* 372 * To avoid a race, we need to grab the next bio 373 * before we schedule this one. See "notes". 374 */ 375 bp3 = g_clone_bio(bp); 376 if (bp3 == NULL) 377 bp->bio_error = ENOMEM; 378 } 379 bp2->bio_done = g_disk_done; 380 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 381 bp2->bio_bcount = bp2->bio_length; 382 bp2->bio_disk = dp; 383 mtx_lock(&sc->start_mtx); 384 devstat_start_transaction_bio(dp->d_devstat, bp2); 385 mtx_unlock(&sc->start_mtx); 386 g_disk_lock_giant(dp); 387 dp->d_strategy(bp2); 388 g_disk_unlock_giant(dp); 389 bp2 = bp3; 390 bp3 = NULL; 391 } while (bp2 != NULL); 392 break; 393 case BIO_GETATTR: 394 /* Give the driver a chance to override */ 395 if (dp->d_getattr != NULL) { 396 if (bp->bio_disk == NULL) 397 bp->bio_disk = dp; 398 error = dp->d_getattr(bp); 399 if (error != -1) 400 break; 401 error = EJUSTRETURN; 402 } 403 if (g_handleattr_int(bp, "GEOM::candelete", 404 (dp->d_flags & DISKFLAG_CANDELETE) != 0)) 405 break; 406 else if (g_handleattr_int(bp, "GEOM::fwsectors", 407 dp->d_fwsectors)) 408 break; 409 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 410 break; 411 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 412 break; 413 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident)) 414 break; 415 else if (g_handleattr_uint16_t(bp, "GEOM::hba_vendor", 416 dp->d_hba_vendor)) 417 break; 418 else if (g_handleattr_uint16_t(bp, "GEOM::hba_device", 419 dp->d_hba_device)) 420 break; 421 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subvendor", 422 dp->d_hba_subvendor)) 423 break; 424 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subdevice", 425 dp->d_hba_subdevice)) 426 break; 427 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 428 g_disk_kerneldump(bp, dp); 429 else if (!strcmp(bp->bio_attribute, "GEOM::setstate")) 430 g_disk_setstate(bp, sc); 431 else if (!strcmp(bp->bio_attribute, "GEOM::rotation_rate")) { 432 uint64_t v; 433 434 if ((dp->d_flags & DISKFLAG_LACKS_ROTRATE) == 0) 435 v = dp->d_rotation_rate; 436 else 437 v = 0; /* rate unknown */ 438 g_handleattr_uint16_t(bp, "GEOM::rotation_rate", v); 439 break; 440 } else 441 error = ENOIOCTL; 442 break; 443 case BIO_FLUSH: 444 g_trace(G_T_BIO, "g_disk_flushcache(%s)", 445 bp->bio_to->name); 446 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) { 447 error = EOPNOTSUPP; 448 break; 449 } 450 bp->bio_disk = dp; 451 bp->bio_to = (void *)bp->bio_done; 452 bp->bio_done = g_disk_done_single; 453 mtx_lock(&sc->start_mtx); 454 devstat_start_transaction_bio(dp->d_devstat, bp); 455 mtx_unlock(&sc->start_mtx); 456 g_disk_lock_giant(dp); 457 dp->d_strategy(bp); 458 g_disk_unlock_giant(dp); 459 break; 460 default: 461 error = EOPNOTSUPP; 462 break; 463 } 464 if (error != EJUSTRETURN) 465 g_io_deliver(bp, error); 466 return; 467} 468 469static void 470g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 471{ 472 struct bio *bp; 473 struct disk *dp; 474 struct g_disk_softc *sc; 475 char *buf; 476 int res = 0; 477 478 sc = gp->softc; 479 if (sc == NULL || (dp = sc->dp) == NULL) 480 return; 481 if (indent == NULL) { 482 sbuf_printf(sb, " hd %u", dp->d_fwheads); 483 sbuf_printf(sb, " sc %u", dp->d_fwsectors); 484 return; 485 } 486 if (pp != NULL) { 487 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", 488 indent, dp->d_fwheads); 489 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", 490 indent, dp->d_fwsectors); 491 if (dp->d_getattr != NULL) { 492 buf = g_malloc(DISK_IDENT_SIZE, M_WAITOK); 493 bp = g_alloc_bio(); 494 bp->bio_disk = dp; 495 bp->bio_attribute = "GEOM::ident"; 496 bp->bio_length = DISK_IDENT_SIZE; 497 bp->bio_data = buf; 498 res = dp->d_getattr(bp); 499 sbuf_printf(sb, "%s<ident>", indent); 500 g_conf_printf_escaped(sb, "%s", 501 res == 0 ? buf: dp->d_ident); 502 sbuf_printf(sb, "</ident>\n"); 503 bp->bio_attribute = "GEOM::lunid"; 504 bp->bio_length = DISK_IDENT_SIZE; 505 bp->bio_data = buf; 506 if (dp->d_getattr(bp) == 0) { 507 sbuf_printf(sb, "%s<lunid>", indent); 508 g_conf_printf_escaped(sb, "%s", buf); 509 sbuf_printf(sb, "</lunid>\n"); 510 } 511 bp->bio_attribute = "GEOM::lunname"; 512 bp->bio_length = DISK_IDENT_SIZE; 513 bp->bio_data = buf; 514 if (dp->d_getattr(bp) == 0) { 515 sbuf_printf(sb, "%s<lunname>", indent); 516 g_conf_printf_escaped(sb, "%s", buf); 517 sbuf_printf(sb, "</lunname>\n"); 518 } 519 g_destroy_bio(bp); 520 g_free(buf); 521 } else { 522 sbuf_printf(sb, "%s<ident>", indent); 523 g_conf_printf_escaped(sb, "%s", dp->d_ident); 524 sbuf_printf(sb, "</ident>\n"); 525 } 526 sbuf_printf(sb, "%s<descr>", indent); 527 g_conf_printf_escaped(sb, "%s", dp->d_descr); 528 sbuf_printf(sb, "</descr>\n"); 529 } 530} 531 532static void 533g_disk_resize(void *ptr, int flag) 534{ 535 struct disk *dp; 536 struct g_geom *gp; 537 struct g_provider *pp; 538 539 if (flag == EV_CANCEL) 540 return; 541 g_topology_assert(); 542 543 dp = ptr; 544 gp = dp->d_geom; 545 546 if (dp->d_destroyed || gp == NULL) 547 return; 548 549 LIST_FOREACH(pp, &gp->provider, provider) { 550 if (pp->sectorsize != 0 && 551 pp->sectorsize != dp->d_sectorsize) 552 g_wither_provider(pp, ENXIO); 553 else 554 g_resize_provider(pp, dp->d_mediasize); 555 } 556} 557 558static void 559g_disk_create(void *arg, int flag) 560{ 561 struct g_geom *gp; 562 struct g_provider *pp; 563 struct disk *dp; 564 struct g_disk_softc *sc; 565 char tmpstr[80]; 566 567 if (flag == EV_CANCEL) 568 return; 569 g_topology_assert(); 570 dp = arg; 571 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 572 mtx_init(&sc->start_mtx, "g_disk_start", NULL, MTX_DEF); 573 mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF); 574 sc->dp = dp; 575 gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit); 576 gp->softc = sc; 577 pp = g_new_providerf(gp, "%s", gp->name); 578 devstat_remove_entry(pp->stat); 579 pp->stat = NULL; 580 dp->d_devstat->id = pp; 581 pp->mediasize = dp->d_mediasize; 582 pp->sectorsize = dp->d_sectorsize; 583 pp->stripeoffset = dp->d_stripeoffset; 584 pp->stripesize = dp->d_stripesize; 585 if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0) 586 pp->flags |= G_PF_ACCEPT_UNMAPPED; 587 if ((dp->d_flags & DISKFLAG_DIRECT_COMPLETION) != 0) 588 pp->flags |= G_PF_DIRECT_SEND; 589 pp->flags |= G_PF_DIRECT_RECEIVE; 590 if (bootverbose) 591 printf("GEOM: new disk %s\n", gp->name); 592 sysctl_ctx_init(&sc->sysctl_ctx); 593 snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name); 594 sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx, 595 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name, 596 CTLFLAG_RD, 0, tmpstr); 597 if (sc->sysctl_tree != NULL) { 598 snprintf(tmpstr, sizeof(tmpstr), 599 "kern.geom.disk.%s.led", gp->name); 600 TUNABLE_STR_FETCH(tmpstr, sc->led, sizeof(sc->led)); 601 SYSCTL_ADD_STRING(&sc->sysctl_ctx, 602 SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led", 603 CTLFLAG_RW | CTLFLAG_TUN, sc->led, sizeof(sc->led), 604 "LED name"); 605 } 606 pp->private = sc; 607 dp->d_geom = gp; 608 g_error_provider(pp, 0); 609} 610 611/* 612 * We get this callback after all of the consumers have gone away, and just 613 * before the provider is freed. If the disk driver provided a d_gone 614 * callback, let them know that it is okay to free resources -- they won't 615 * be getting any more accesses from GEOM. 616 */ 617static void 618g_disk_providergone(struct g_provider *pp) 619{ 620 struct disk *dp; 621 struct g_disk_softc *sc; 622 623 sc = (struct g_disk_softc *)pp->private; 624 dp = sc->dp; 625 if (dp != NULL && dp->d_gone != NULL) 626 dp->d_gone(dp); 627 if (sc->sysctl_tree != NULL) { 628 sysctl_ctx_free(&sc->sysctl_ctx); 629 sc->sysctl_tree = NULL; 630 } 631 if (sc->led[0] != 0) { 632 led_set(sc->led, "0"); 633 sc->led[0] = 0; 634 } 635 pp->private = NULL; 636 pp->geom->softc = NULL; 637 mtx_destroy(&sc->done_mtx); 638 mtx_destroy(&sc->start_mtx); 639 g_free(sc); 640} 641 642static void 643g_disk_destroy(void *ptr, int flag) 644{ 645 struct disk *dp; 646 struct g_geom *gp; 647 struct g_disk_softc *sc; 648 649 g_topology_assert(); 650 dp = ptr; 651 gp = dp->d_geom; 652 if (gp != NULL) { 653 sc = gp->softc; 654 if (sc != NULL) 655 sc->dp = NULL; 656 dp->d_geom = NULL; 657 g_wither_geom(gp, ENXIO); 658 } 659 g_free(dp); 660} 661 662/* 663 * We only allow printable characters in disk ident, 664 * the rest is converted to 'x<HH>'. 665 */ 666static void 667g_disk_ident_adjust(char *ident, size_t size) 668{ 669 char *p, tmp[4], newid[DISK_IDENT_SIZE]; 670 671 newid[0] = '\0'; 672 for (p = ident; *p != '\0'; p++) { 673 if (isprint(*p)) { 674 tmp[0] = *p; 675 tmp[1] = '\0'; 676 } else { 677 snprintf(tmp, sizeof(tmp), "x%02hhx", 678 *(unsigned char *)p); 679 } 680 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid)) 681 break; 682 } 683 bzero(ident, size); 684 strlcpy(ident, newid, size); 685} 686 687struct disk * 688disk_alloc(void) 689{ 690 691 return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO)); 692} 693 694void 695disk_create(struct disk *dp, int version) 696{ 697 698 if (version != DISK_VERSION) { 699 printf("WARNING: Attempt to add disk %s%d %s", 700 dp->d_name, dp->d_unit, 701 " using incompatible ABI version of disk(9)\n"); 702 printf("WARNING: Ignoring disk %s%d\n", 703 dp->d_name, dp->d_unit); 704 return; 705 } 706 if (version < DISK_VERSION_04) 707 dp->d_flags |= DISKFLAG_LACKS_ROTRATE; 708 KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy")); 709 KASSERT(dp->d_name != NULL, ("disk_create need d_name")); 710 KASSERT(*dp->d_name != 0, ("disk_create need d_name")); 711 KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long")); 712 if (dp->d_devstat == NULL) 713 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit, 714 dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED, 715 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 716 dp->d_geom = NULL; 717 g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident)); 718 g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL); 719} 720 721void 722disk_destroy(struct disk *dp) 723{ 724 725 g_cancel_event(dp); 726 dp->d_destroyed = 1; 727 if (dp->d_devstat != NULL) 728 devstat_remove_entry(dp->d_devstat); 729 g_post_event(g_disk_destroy, dp, M_WAITOK, NULL); 730} 731 732void 733disk_gone(struct disk *dp) 734{ 735 struct g_geom *gp; 736 struct g_provider *pp; 737 738 gp = dp->d_geom; 739 if (gp != NULL) { 740 pp = LIST_FIRST(&gp->provider); 741 if (pp != NULL) { 742 KASSERT(LIST_NEXT(pp, provider) == NULL, 743 ("geom %p has more than one provider", gp)); 744 g_wither_provider(pp, ENXIO); 745 } 746 } 747} 748 749void 750disk_attr_changed(struct disk *dp, const char *attr, int flag) 751{ 752 struct g_geom *gp; 753 struct g_provider *pp; 754 755 gp = dp->d_geom; 756 if (gp != NULL) 757 LIST_FOREACH(pp, &gp->provider, provider) 758 (void)g_attr_changed(pp, attr, flag); 759} 760 761void 762disk_media_changed(struct disk *dp, int flag) 763{ 764 struct g_geom *gp; 765 struct g_provider *pp; 766 767 gp = dp->d_geom; 768 if (gp != NULL) { 769 pp = LIST_FIRST(&gp->provider); 770 if (pp != NULL) { 771 KASSERT(LIST_NEXT(pp, provider) == NULL, 772 ("geom %p has more than one provider", gp)); 773 g_media_changed(pp, flag); 774 } 775 } 776} 777 778void 779disk_media_gone(struct disk *dp, int flag) 780{ 781 struct g_geom *gp; 782 struct g_provider *pp; 783 784 gp = dp->d_geom; 785 if (gp != NULL) { 786 pp = LIST_FIRST(&gp->provider); 787 if (pp != NULL) { 788 KASSERT(LIST_NEXT(pp, provider) == NULL, 789 ("geom %p has more than one provider", gp)); 790 g_media_gone(pp, flag); 791 } 792 } 793} 794 795int 796disk_resize(struct disk *dp, int flag) 797{ 798 799 if (dp->d_destroyed || dp->d_geom == NULL) 800 return (0); 801 802 return (g_post_event(g_disk_resize, dp, flag, NULL)); 803} 804 805static void 806g_kern_disks(void *p, int flag __unused) 807{ 808 struct sbuf *sb; 809 struct g_geom *gp; 810 char *sp; 811 812 sb = p; 813 sp = ""; 814 g_topology_assert(); 815 LIST_FOREACH(gp, &g_disk_class.geom, geom) { 816 sbuf_printf(sb, "%s%s", sp, gp->name); 817 sp = " "; 818 } 819 sbuf_finish(sb); 820} 821 822static int 823sysctl_disks(SYSCTL_HANDLER_ARGS) 824{ 825 int error; 826 struct sbuf *sb; 827 828 sb = sbuf_new_auto(); 829 g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL); 830 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 831 sbuf_delete(sb); 832 return error; 833} 834 835SYSCTL_PROC(_kern, OID_AUTO, disks, 836 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 837 sysctl_disks, "A", "names of available disks"); 838