geom_disk.c revision 294042
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 294042 2016-01-14 21:52:21Z rpokala $"); 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#include <machine/bus.h> 62 63struct g_disk_softc { 64 struct mtx done_mtx; 65 struct disk *dp; 66 struct sysctl_ctx_list sysctl_ctx; 67 struct sysctl_oid *sysctl_tree; 68 char led[64]; 69 uint32_t state; 70 struct mtx start_mtx; 71}; 72 73static g_access_t g_disk_access; 74static g_start_t g_disk_start; 75static g_ioctl_t g_disk_ioctl; 76static g_dumpconf_t g_disk_dumpconf; 77static g_provgone_t g_disk_providergone; 78 79static struct g_class g_disk_class = { 80 .name = G_DISK_CLASS_NAME, 81 .version = G_VERSION, 82 .start = g_disk_start, 83 .access = g_disk_access, 84 .ioctl = g_disk_ioctl, 85 .providergone = g_disk_providergone, 86 .dumpconf = g_disk_dumpconf, 87}; 88 89SYSCTL_DECL(_kern_geom); 90static SYSCTL_NODE(_kern_geom, OID_AUTO, disk, CTLFLAG_RW, 0, 91 "GEOM_DISK stuff"); 92 93DECLARE_GEOM_CLASS(g_disk_class, g_disk); 94 95static int 96g_disk_access(struct g_provider *pp, int r, int w, int e) 97{ 98 struct disk *dp; 99 struct g_disk_softc *sc; 100 int error; 101 102 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 103 pp->name, r, w, e); 104 g_topology_assert(); 105 sc = pp->private; 106 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) { 107 /* 108 * Allow decreasing access count even if disk is not 109 * avaliable anymore. 110 */ 111 if (r <= 0 && w <= 0 && e <= 0) 112 return (0); 113 return (ENXIO); 114 } 115 r += pp->acr; 116 w += pp->acw; 117 e += pp->ace; 118 error = 0; 119 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 120 if (dp->d_open != NULL) { 121 error = dp->d_open(dp); 122 if (bootverbose && error != 0) 123 printf("Opened disk %s -> %d\n", 124 pp->name, error); 125 if (error != 0) 126 return (error); 127 } 128 pp->mediasize = dp->d_mediasize; 129 pp->sectorsize = dp->d_sectorsize; 130 if (dp->d_maxsize == 0) { 131 printf("WARNING: Disk drive %s%d has no d_maxsize\n", 132 dp->d_name, dp->d_unit); 133 dp->d_maxsize = DFLTPHYS; 134 } 135 if (dp->d_delmaxsize == 0) { 136 if (bootverbose && dp->d_flags & DISKFLAG_CANDELETE) { 137 printf("WARNING: Disk drive %s%d has no " 138 "d_delmaxsize\n", dp->d_name, dp->d_unit); 139 } 140 dp->d_delmaxsize = dp->d_maxsize; 141 } 142 pp->stripeoffset = dp->d_stripeoffset; 143 pp->stripesize = dp->d_stripesize; 144 dp->d_flags |= DISKFLAG_OPEN; 145 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 146 if (dp->d_close != NULL) { 147 error = dp->d_close(dp); 148 if (error != 0) 149 printf("Closed disk %s -> %d\n", 150 pp->name, error); 151 } 152 sc->state = G_STATE_ACTIVE; 153 if (sc->led[0] != 0) 154 led_set(sc->led, "0"); 155 dp->d_flags &= ~DISKFLAG_OPEN; 156 } 157 return (error); 158} 159 160static void 161g_disk_kerneldump(struct bio *bp, struct disk *dp) 162{ 163 struct g_kerneldump *gkd; 164 struct g_geom *gp; 165 166 gkd = (struct g_kerneldump*)bp->bio_data; 167 gp = bp->bio_to->geom; 168 g_trace(G_T_TOPOLOGY, "g_disk_kerneldump(%s, %jd, %jd)", 169 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 170 if (dp->d_dump == NULL) { 171 g_io_deliver(bp, ENODEV); 172 return; 173 } 174 gkd->di.dumper = dp->d_dump; 175 gkd->di.priv = dp; 176 gkd->di.blocksize = dp->d_sectorsize; 177 gkd->di.maxiosize = dp->d_maxsize; 178 gkd->di.mediaoffset = gkd->offset; 179 if ((gkd->offset + gkd->length) > dp->d_mediasize) 180 gkd->length = dp->d_mediasize - gkd->offset; 181 gkd->di.mediasize = gkd->length; 182 g_io_deliver(bp, 0); 183} 184 185static void 186g_disk_setstate(struct bio *bp, struct g_disk_softc *sc) 187{ 188 const char *cmd; 189 190 memcpy(&sc->state, bp->bio_data, sizeof(sc->state)); 191 if (sc->led[0] != 0) { 192 switch (sc->state) { 193 case G_STATE_FAILED: 194 cmd = "1"; 195 break; 196 case G_STATE_REBUILD: 197 cmd = "f5"; 198 break; 199 case G_STATE_RESYNC: 200 cmd = "f1"; 201 break; 202 default: 203 cmd = "0"; 204 break; 205 } 206 led_set(sc->led, cmd); 207 } 208 g_io_deliver(bp, 0); 209} 210 211static void 212g_disk_done(struct bio *bp) 213{ 214 struct bintime now; 215 struct bio *bp2; 216 struct g_disk_softc *sc; 217 218 /* See "notes" for why we need a mutex here */ 219 /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */ 220 bp2 = bp->bio_parent; 221 sc = bp2->bio_to->private; 222 bp->bio_completed = bp->bio_length - bp->bio_resid; 223 binuptime(&now); 224 mtx_lock(&sc->done_mtx); 225 if (bp2->bio_error == 0) 226 bp2->bio_error = bp->bio_error; 227 bp2->bio_completed += bp->bio_completed; 228 if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE|BIO_FLUSH)) != 0) 229 devstat_end_transaction_bio_bt(sc->dp->d_devstat, bp, &now); 230 bp2->bio_inbed++; 231 if (bp2->bio_children == bp2->bio_inbed) { 232 mtx_unlock(&sc->done_mtx); 233 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed; 234 g_io_deliver(bp2, bp2->bio_error); 235 } else 236 mtx_unlock(&sc->done_mtx); 237 g_destroy_bio(bp); 238} 239 240static int 241g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td) 242{ 243 struct disk *dp; 244 struct g_disk_softc *sc; 245 int error; 246 247 sc = pp->private; 248 dp = sc->dp; 249 250 if (dp->d_ioctl == NULL) 251 return (ENOIOCTL); 252 error = dp->d_ioctl(dp, cmd, data, fflag, td); 253 return (error); 254} 255 256static off_t 257g_disk_maxsize(struct disk *dp, struct bio *bp) 258{ 259 if (bp->bio_cmd == BIO_DELETE) 260 return (dp->d_delmaxsize); 261 return (dp->d_maxsize); 262} 263 264static int 265g_disk_maxsegs(struct disk *dp, struct bio *bp) 266{ 267 return ((g_disk_maxsize(dp, bp) / PAGE_SIZE) + 1); 268} 269 270static void 271g_disk_advance(struct disk *dp, struct bio *bp, off_t off) 272{ 273 274 bp->bio_offset += off; 275 bp->bio_length -= off; 276 277 if ((bp->bio_flags & BIO_VLIST) != 0) { 278 bus_dma_segment_t *seg, *end; 279 280 seg = (bus_dma_segment_t *)bp->bio_data; 281 end = (bus_dma_segment_t *)bp->bio_data + bp->bio_ma_n; 282 off += bp->bio_ma_offset; 283 while (off >= seg->ds_len) { 284 KASSERT((seg != end), 285 ("vlist request runs off the end")); 286 off -= seg->ds_len; 287 seg++; 288 } 289 bp->bio_ma_offset = off; 290 bp->bio_ma_n = end - seg; 291 bp->bio_data = (void *)seg; 292 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 293 bp->bio_ma += off / PAGE_SIZE; 294 bp->bio_ma_offset += off; 295 bp->bio_ma_offset %= PAGE_SIZE; 296 bp->bio_ma_n -= off / PAGE_SIZE; 297 } else { 298 bp->bio_data += off; 299 } 300} 301 302static void 303g_disk_seg_limit(bus_dma_segment_t *seg, off_t *poffset, 304 off_t *plength, int *ppages) 305{ 306 uintptr_t seg_page_base; 307 uintptr_t seg_page_end; 308 off_t offset; 309 off_t length; 310 int seg_pages; 311 312 offset = *poffset; 313 length = *plength; 314 315 if (length > seg->ds_len - offset) 316 length = seg->ds_len - offset; 317 318 seg_page_base = trunc_page(seg->ds_addr + offset); 319 seg_page_end = round_page(seg->ds_addr + offset + length); 320 seg_pages = (seg_page_end - seg_page_base) >> PAGE_SHIFT; 321 322 if (seg_pages > *ppages) { 323 seg_pages = *ppages; 324 length = (seg_page_base + (seg_pages << PAGE_SHIFT)) - 325 (seg->ds_addr + offset); 326 } 327 328 *poffset = 0; 329 *plength -= length; 330 *ppages -= seg_pages; 331} 332 333static off_t 334g_disk_vlist_limit(struct disk *dp, struct bio *bp, bus_dma_segment_t **pendseg) 335{ 336 bus_dma_segment_t *seg, *end; 337 off_t residual; 338 off_t offset; 339 int pages; 340 341 seg = (bus_dma_segment_t *)bp->bio_data; 342 end = (bus_dma_segment_t *)bp->bio_data + bp->bio_ma_n; 343 residual = bp->bio_length; 344 offset = bp->bio_ma_offset; 345 pages = g_disk_maxsegs(dp, bp); 346 while (residual != 0 && pages != 0) { 347 KASSERT((seg != end), 348 ("vlist limit runs off the end")); 349 g_disk_seg_limit(seg, &offset, &residual, &pages); 350 seg++; 351 } 352 if (pendseg != NULL) 353 *pendseg = seg; 354 return (residual); 355} 356 357static bool 358g_disk_limit(struct disk *dp, struct bio *bp) 359{ 360 bool limited = false; 361 off_t maxsz; 362 363 maxsz = g_disk_maxsize(dp, bp); 364 365 /* 366 * XXX: If we have a stripesize we should really use it here. 367 * Care should be taken in the delete case if this is done 368 * as deletes can be very sensitive to size given how they 369 * are processed. 370 */ 371 if (bp->bio_length > maxsz) { 372 bp->bio_length = maxsz; 373 limited = true; 374 } 375 376 if ((bp->bio_flags & BIO_VLIST) != 0) { 377 bus_dma_segment_t *firstseg, *endseg; 378 off_t residual; 379 380 firstseg = (bus_dma_segment_t*)bp->bio_data; 381 residual = g_disk_vlist_limit(dp, bp, &endseg); 382 if (residual != 0) { 383 bp->bio_ma_n = endseg - firstseg; 384 bp->bio_length -= residual; 385 limited = true; 386 } 387 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 388 bp->bio_ma_n = 389 howmany(bp->bio_ma_offset + bp->bio_length, PAGE_SIZE); 390 } 391 392 return (limited); 393} 394 395static void 396g_disk_start(struct bio *bp) 397{ 398 struct bio *bp2, *bp3; 399 struct disk *dp; 400 struct g_disk_softc *sc; 401 int error; 402 off_t off; 403 404 sc = bp->bio_to->private; 405 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) { 406 g_io_deliver(bp, ENXIO); 407 return; 408 } 409 error = EJUSTRETURN; 410 switch(bp->bio_cmd) { 411 case BIO_DELETE: 412 if (!(dp->d_flags & DISKFLAG_CANDELETE)) { 413 error = EOPNOTSUPP; 414 break; 415 } 416 /* fall-through */ 417 case BIO_READ: 418 case BIO_WRITE: 419 KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0 || 420 (bp->bio_flags & BIO_UNMAPPED) == 0, 421 ("unmapped bio not supported by disk %s", dp->d_name)); 422 off = 0; 423 bp3 = NULL; 424 bp2 = g_clone_bio(bp); 425 if (bp2 == NULL) { 426 error = ENOMEM; 427 break; 428 } 429 for (;;) { 430 if (g_disk_limit(dp, bp2)) { 431 off += bp2->bio_length; 432 433 /* 434 * To avoid a race, we need to grab the next bio 435 * before we schedule this one. See "notes". 436 */ 437 bp3 = g_clone_bio(bp); 438 if (bp3 == NULL) 439 bp->bio_error = ENOMEM; 440 } 441 bp2->bio_done = g_disk_done; 442 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 443 bp2->bio_bcount = bp2->bio_length; 444 bp2->bio_disk = dp; 445 mtx_lock(&sc->start_mtx); 446 devstat_start_transaction_bio(dp->d_devstat, bp2); 447 mtx_unlock(&sc->start_mtx); 448 dp->d_strategy(bp2); 449 450 if (bp3 == NULL) 451 break; 452 453 bp2 = bp3; 454 bp3 = NULL; 455 g_disk_advance(dp, bp2, off); 456 } 457 break; 458 case BIO_GETATTR: 459 /* Give the driver a chance to override */ 460 if (dp->d_getattr != NULL) { 461 if (bp->bio_disk == NULL) 462 bp->bio_disk = dp; 463 error = dp->d_getattr(bp); 464 if (error != -1) 465 break; 466 error = EJUSTRETURN; 467 } 468 if (g_handleattr_int(bp, "GEOM::candelete", 469 (dp->d_flags & DISKFLAG_CANDELETE) != 0)) 470 break; 471 else if (g_handleattr_int(bp, "GEOM::fwsectors", 472 dp->d_fwsectors)) 473 break; 474 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 475 break; 476 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 477 break; 478 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident)) 479 break; 480 else if (g_handleattr_uint16_t(bp, "GEOM::hba_vendor", 481 dp->d_hba_vendor)) 482 break; 483 else if (g_handleattr_uint16_t(bp, "GEOM::hba_device", 484 dp->d_hba_device)) 485 break; 486 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subvendor", 487 dp->d_hba_subvendor)) 488 break; 489 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subdevice", 490 dp->d_hba_subdevice)) 491 break; 492 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 493 g_disk_kerneldump(bp, dp); 494 else if (!strcmp(bp->bio_attribute, "GEOM::setstate")) 495 g_disk_setstate(bp, sc); 496 else if (g_handleattr_uint16_t(bp, "GEOM::rotation_rate", 497 dp->d_rotation_rate)) 498 break; 499 else 500 error = ENOIOCTL; 501 break; 502 case BIO_FLUSH: 503 g_trace(G_T_BIO, "g_disk_flushcache(%s)", 504 bp->bio_to->name); 505 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) { 506 error = EOPNOTSUPP; 507 break; 508 } 509 bp2 = g_clone_bio(bp); 510 if (bp2 == NULL) { 511 g_io_deliver(bp, ENOMEM); 512 return; 513 } 514 bp2->bio_done = g_disk_done; 515 bp2->bio_disk = dp; 516 mtx_lock(&sc->start_mtx); 517 devstat_start_transaction_bio(dp->d_devstat, bp2); 518 mtx_unlock(&sc->start_mtx); 519 dp->d_strategy(bp2); 520 break; 521 default: 522 error = EOPNOTSUPP; 523 break; 524 } 525 if (error != EJUSTRETURN) 526 g_io_deliver(bp, error); 527 return; 528} 529 530static void 531g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 532{ 533 struct bio *bp; 534 struct disk *dp; 535 struct g_disk_softc *sc; 536 char *buf; 537 int res = 0; 538 539 sc = gp->softc; 540 if (sc == NULL || (dp = sc->dp) == NULL) 541 return; 542 if (indent == NULL) { 543 sbuf_printf(sb, " hd %u", dp->d_fwheads); 544 sbuf_printf(sb, " sc %u", dp->d_fwsectors); 545 return; 546 } 547 if (pp != NULL) { 548 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", 549 indent, dp->d_fwheads); 550 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", 551 indent, dp->d_fwsectors); 552 553 /* 554 * "rotationrate" is a little complicated, because the value 555 * returned by the drive might not be the RPM; 0 and 1 are 556 * special cases, and there's also a valid range. 557 */ 558 sbuf_printf(sb, "%s<rotationrate>", indent); 559 if (dp->d_rotation_rate == 0) /* Old drives don't */ 560 sbuf_printf(sb, "unknown"); /* report RPM. */ 561 else if (dp->d_rotation_rate == 1) /* Since 0 is used */ 562 sbuf_printf(sb, "0"); /* above, SSDs use 1. */ 563 else if ((dp->d_rotation_rate >= 0x041) && 564 (dp->d_rotation_rate <= 0xfffe)) 565 sbuf_printf(sb, "%u", dp->d_rotation_rate); 566 else 567 sbuf_printf(sb, "invalid"); 568 sbuf_printf(sb, "</rotationrate>\n"); 569 if (dp->d_getattr != NULL) { 570 buf = g_malloc(DISK_IDENT_SIZE, M_WAITOK); 571 bp = g_alloc_bio(); 572 bp->bio_disk = dp; 573 bp->bio_attribute = "GEOM::ident"; 574 bp->bio_length = DISK_IDENT_SIZE; 575 bp->bio_data = buf; 576 res = dp->d_getattr(bp); 577 sbuf_printf(sb, "%s<ident>", indent); 578 g_conf_printf_escaped(sb, "%s", 579 res == 0 ? buf: dp->d_ident); 580 sbuf_printf(sb, "</ident>\n"); 581 bp->bio_attribute = "GEOM::lunid"; 582 bp->bio_length = DISK_IDENT_SIZE; 583 bp->bio_data = buf; 584 if (dp->d_getattr(bp) == 0) { 585 sbuf_printf(sb, "%s<lunid>", indent); 586 g_conf_printf_escaped(sb, "%s", buf); 587 sbuf_printf(sb, "</lunid>\n"); 588 } 589 bp->bio_attribute = "GEOM::lunname"; 590 bp->bio_length = DISK_IDENT_SIZE; 591 bp->bio_data = buf; 592 if (dp->d_getattr(bp) == 0) { 593 sbuf_printf(sb, "%s<lunname>", indent); 594 g_conf_printf_escaped(sb, "%s", buf); 595 sbuf_printf(sb, "</lunname>\n"); 596 } 597 g_destroy_bio(bp); 598 g_free(buf); 599 } else { 600 sbuf_printf(sb, "%s<ident>", indent); 601 g_conf_printf_escaped(sb, "%s", dp->d_ident); 602 sbuf_printf(sb, "</ident>\n"); 603 } 604 sbuf_printf(sb, "%s<descr>", indent); 605 g_conf_printf_escaped(sb, "%s", dp->d_descr); 606 sbuf_printf(sb, "</descr>\n"); 607 } 608} 609 610static void 611g_disk_resize(void *ptr, int flag) 612{ 613 struct disk *dp; 614 struct g_geom *gp; 615 struct g_provider *pp; 616 617 if (flag == EV_CANCEL) 618 return; 619 g_topology_assert(); 620 621 dp = ptr; 622 gp = dp->d_geom; 623 624 if (dp->d_destroyed || gp == NULL) 625 return; 626 627 LIST_FOREACH(pp, &gp->provider, provider) { 628 if (pp->sectorsize != 0 && 629 pp->sectorsize != dp->d_sectorsize) 630 g_wither_provider(pp, ENXIO); 631 else 632 g_resize_provider(pp, dp->d_mediasize); 633 } 634} 635 636static void 637g_disk_create(void *arg, int flag) 638{ 639 struct g_geom *gp; 640 struct g_provider *pp; 641 struct disk *dp; 642 struct g_disk_softc *sc; 643 char tmpstr[80]; 644 645 if (flag == EV_CANCEL) 646 return; 647 g_topology_assert(); 648 dp = arg; 649 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 650 mtx_init(&sc->start_mtx, "g_disk_start", NULL, MTX_DEF); 651 mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF); 652 sc->dp = dp; 653 gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit); 654 gp->softc = sc; 655 pp = g_new_providerf(gp, "%s", gp->name); 656 devstat_remove_entry(pp->stat); 657 pp->stat = NULL; 658 dp->d_devstat->id = pp; 659 pp->mediasize = dp->d_mediasize; 660 pp->sectorsize = dp->d_sectorsize; 661 pp->stripeoffset = dp->d_stripeoffset; 662 pp->stripesize = dp->d_stripesize; 663 if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0) 664 pp->flags |= G_PF_ACCEPT_UNMAPPED; 665 if ((dp->d_flags & DISKFLAG_DIRECT_COMPLETION) != 0) 666 pp->flags |= G_PF_DIRECT_SEND; 667 pp->flags |= G_PF_DIRECT_RECEIVE; 668 if (bootverbose) 669 printf("GEOM: new disk %s\n", gp->name); 670 sysctl_ctx_init(&sc->sysctl_ctx); 671 snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name); 672 sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx, 673 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name, 674 CTLFLAG_RD, 0, tmpstr); 675 if (sc->sysctl_tree != NULL) { 676 SYSCTL_ADD_STRING(&sc->sysctl_ctx, 677 SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led", 678 CTLFLAG_RWTUN, sc->led, sizeof(sc->led), 679 "LED name"); 680 } 681 pp->private = sc; 682 dp->d_geom = gp; 683 g_error_provider(pp, 0); 684} 685 686/* 687 * We get this callback after all of the consumers have gone away, and just 688 * before the provider is freed. If the disk driver provided a d_gone 689 * callback, let them know that it is okay to free resources -- they won't 690 * be getting any more accesses from GEOM. 691 */ 692static void 693g_disk_providergone(struct g_provider *pp) 694{ 695 struct disk *dp; 696 struct g_disk_softc *sc; 697 698 sc = (struct g_disk_softc *)pp->private; 699 dp = sc->dp; 700 if (dp != NULL && dp->d_gone != NULL) 701 dp->d_gone(dp); 702 if (sc->sysctl_tree != NULL) { 703 sysctl_ctx_free(&sc->sysctl_ctx); 704 sc->sysctl_tree = NULL; 705 } 706 if (sc->led[0] != 0) { 707 led_set(sc->led, "0"); 708 sc->led[0] = 0; 709 } 710 pp->private = NULL; 711 pp->geom->softc = NULL; 712 mtx_destroy(&sc->done_mtx); 713 mtx_destroy(&sc->start_mtx); 714 g_free(sc); 715} 716 717static void 718g_disk_destroy(void *ptr, int flag) 719{ 720 struct disk *dp; 721 struct g_geom *gp; 722 struct g_disk_softc *sc; 723 724 g_topology_assert(); 725 dp = ptr; 726 gp = dp->d_geom; 727 if (gp != NULL) { 728 sc = gp->softc; 729 if (sc != NULL) 730 sc->dp = NULL; 731 dp->d_geom = NULL; 732 g_wither_geom(gp, ENXIO); 733 } 734 g_free(dp); 735} 736 737/* 738 * We only allow printable characters in disk ident, 739 * the rest is converted to 'x<HH>'. 740 */ 741static void 742g_disk_ident_adjust(char *ident, size_t size) 743{ 744 char *p, tmp[4], newid[DISK_IDENT_SIZE]; 745 746 newid[0] = '\0'; 747 for (p = ident; *p != '\0'; p++) { 748 if (isprint(*p)) { 749 tmp[0] = *p; 750 tmp[1] = '\0'; 751 } else { 752 snprintf(tmp, sizeof(tmp), "x%02hhx", 753 *(unsigned char *)p); 754 } 755 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid)) 756 break; 757 } 758 bzero(ident, size); 759 strlcpy(ident, newid, size); 760} 761 762struct disk * 763disk_alloc(void) 764{ 765 766 return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO)); 767} 768 769void 770disk_create(struct disk *dp, int version) 771{ 772 773 if (version != DISK_VERSION) { 774 printf("WARNING: Attempt to add disk %s%d %s", 775 dp->d_name, dp->d_unit, 776 " using incompatible ABI version of disk(9)\n"); 777 printf("WARNING: Ignoring disk %s%d\n", 778 dp->d_name, dp->d_unit); 779 return; 780 } 781 if (dp->d_flags & DISKFLAG_RESERVED) { 782 printf("WARNING: Attempt to add non-MPSAFE disk %s%d\n", 783 dp->d_name, dp->d_unit); 784 printf("WARNING: Ignoring disk %s%d\n", 785 dp->d_name, dp->d_unit); 786 return; 787 } 788 KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy")); 789 KASSERT(dp->d_name != NULL, ("disk_create need d_name")); 790 KASSERT(*dp->d_name != 0, ("disk_create need d_name")); 791 KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long")); 792 if (dp->d_devstat == NULL) 793 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit, 794 dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED, 795 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 796 dp->d_geom = NULL; 797 g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident)); 798 g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL); 799} 800 801void 802disk_destroy(struct disk *dp) 803{ 804 805 g_cancel_event(dp); 806 dp->d_destroyed = 1; 807 if (dp->d_devstat != NULL) 808 devstat_remove_entry(dp->d_devstat); 809 g_post_event(g_disk_destroy, dp, M_WAITOK, NULL); 810} 811 812void 813disk_gone(struct disk *dp) 814{ 815 struct g_geom *gp; 816 struct g_provider *pp; 817 818 gp = dp->d_geom; 819 if (gp != NULL) { 820 pp = LIST_FIRST(&gp->provider); 821 if (pp != NULL) { 822 KASSERT(LIST_NEXT(pp, provider) == NULL, 823 ("geom %p has more than one provider", gp)); 824 g_wither_provider(pp, ENXIO); 825 } 826 } 827} 828 829void 830disk_attr_changed(struct disk *dp, const char *attr, int flag) 831{ 832 struct g_geom *gp; 833 struct g_provider *pp; 834 835 gp = dp->d_geom; 836 if (gp != NULL) 837 LIST_FOREACH(pp, &gp->provider, provider) 838 (void)g_attr_changed(pp, attr, flag); 839} 840 841void 842disk_media_changed(struct disk *dp, int flag) 843{ 844 struct g_geom *gp; 845 struct g_provider *pp; 846 847 gp = dp->d_geom; 848 if (gp != NULL) { 849 pp = LIST_FIRST(&gp->provider); 850 if (pp != NULL) { 851 KASSERT(LIST_NEXT(pp, provider) == NULL, 852 ("geom %p has more than one provider", gp)); 853 g_media_changed(pp, flag); 854 } 855 } 856} 857 858void 859disk_media_gone(struct disk *dp, int flag) 860{ 861 struct g_geom *gp; 862 struct g_provider *pp; 863 864 gp = dp->d_geom; 865 if (gp != NULL) { 866 pp = LIST_FIRST(&gp->provider); 867 if (pp != NULL) { 868 KASSERT(LIST_NEXT(pp, provider) == NULL, 869 ("geom %p has more than one provider", gp)); 870 g_media_gone(pp, flag); 871 } 872 } 873} 874 875int 876disk_resize(struct disk *dp, int flag) 877{ 878 879 if (dp->d_destroyed || dp->d_geom == NULL) 880 return (0); 881 882 return (g_post_event(g_disk_resize, dp, flag, NULL)); 883} 884 885static void 886g_kern_disks(void *p, int flag __unused) 887{ 888 struct sbuf *sb; 889 struct g_geom *gp; 890 char *sp; 891 892 sb = p; 893 sp = ""; 894 g_topology_assert(); 895 LIST_FOREACH(gp, &g_disk_class.geom, geom) { 896 sbuf_printf(sb, "%s%s", sp, gp->name); 897 sp = " "; 898 } 899 sbuf_finish(sb); 900} 901 902static int 903sysctl_disks(SYSCTL_HANDLER_ARGS) 904{ 905 int error; 906 struct sbuf *sb; 907 908 sb = sbuf_new_auto(); 909 g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL); 910 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 911 sbuf_delete(sb); 912 return error; 913} 914 915SYSCTL_PROC(_kern, OID_AUTO, disks, 916 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 917 sysctl_disks, "A", "names of available disks"); 918