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: releng/11.1/sys/geom/geom_disk.c 312405 2017-01-19 11:16:25Z mav $"); 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/bus.h> 47 #include <sys/ctype.h> 48 #include <sys/fcntl.h> 49 #include <sys/malloc.h> 50 #include <sys/sbuf.h> 51 #include <sys/devicestat.h> 52 #include <machine/md_var.h> 53 54 #include <sys/lock.h> 55 #include <sys/mutex.h> 56 #include <geom/geom.h> 57 #include <geom/geom_disk.h> 58 #include <geom/geom_int.h> 59 60 #include <dev/led/led.h> 61 62 #include <machine/bus.h> 63 64 struct g_disk_softc { 65 struct mtx done_mtx; 66 struct disk *dp; 67 struct sysctl_ctx_list sysctl_ctx; 68 struct sysctl_oid *sysctl_tree; 69 char led[64]; 70 uint32_t state; 71 struct mtx start_mtx; 72 }; 73 74 static g_access_t g_disk_access; 75 static g_start_t g_disk_start; 76 static g_ioctl_t g_disk_ioctl; 77 static g_dumpconf_t g_disk_dumpconf; 78 static g_provgone_t g_disk_providergone; 79 80 static struct g_class g_disk_class = { 81 .name = G_DISK_CLASS_NAME, 82 .version = G_VERSION, 83 .start = g_disk_start, 84 .access = g_disk_access, 85 .ioctl = g_disk_ioctl, 86 .providergone = g_disk_providergone, 87 .dumpconf = g_disk_dumpconf, 88 }; 89 90 SYSCTL_DECL(_kern_geom); 91 static SYSCTL_NODE(_kern_geom, OID_AUTO, disk, CTLFLAG_RW, 0, 92 "GEOM_DISK stuff"); 93 94 DECLARE_GEOM_CLASS(g_disk_class, g_disk); 95 96 static int 97 g_disk_access(struct g_provider *pp, int r, int w, int e) 98 { 99 struct disk *dp; 100 struct g_disk_softc *sc; 101 int error; 102 103 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 104 pp->name, r, w, e); 105 g_topology_assert(); 106 sc = pp->private; 107 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) { 108 /* 109 * Allow decreasing access count even if disk is not 110 * available anymore. 111 */ 112 if (r <= 0 && w <= 0 && e <= 0) 113 return (0); 114 return (ENXIO); 115 } 116 r += pp->acr; 117 w += pp->acw; 118 e += pp->ace; 119 error = 0; 120 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 121 if (dp->d_open != NULL) { 122 error = dp->d_open(dp); 123 if (bootverbose && error != 0) 124 printf("Opened disk %s -> %d\n", 125 pp->name, error); 126 if (error != 0) 127 return (error); 128 } 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 /* 146 * Do not invoke resize event when initial size was zero. 147 * Some disks report its size only after first opening. 148 */ 149 if (pp->mediasize == 0) 150 pp->mediasize = dp->d_mediasize; 151 else 152 g_resize_provider(pp, dp->d_mediasize); 153 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 154 if (dp->d_close != NULL) { 155 error = dp->d_close(dp); 156 if (error != 0) 157 printf("Closed disk %s -> %d\n", 158 pp->name, error); 159 } 160 sc->state = G_STATE_ACTIVE; 161 if (sc->led[0] != 0) 162 led_set(sc->led, ""); 163 dp->d_flags &= ~DISKFLAG_OPEN; 164 } 165 return (error); 166 } 167 168 static void 169 g_disk_kerneldump(struct bio *bp, struct disk *dp) 170 { 171 struct g_kerneldump *gkd; 172 struct g_geom *gp; 173 174 gkd = (struct g_kerneldump*)bp->bio_data; 175 gp = bp->bio_to->geom; 176 g_trace(G_T_TOPOLOGY, "g_disk_kerneldump(%s, %jd, %jd)", 177 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 178 if (dp->d_dump == NULL) { 179 g_io_deliver(bp, ENODEV); 180 return; 181 } 182 gkd->di.dumper = dp->d_dump; 183 gkd->di.priv = dp; 184 gkd->di.blocksize = dp->d_sectorsize; 185 gkd->di.maxiosize = dp->d_maxsize; 186 gkd->di.mediaoffset = gkd->offset; 187 if ((gkd->offset + gkd->length) > dp->d_mediasize) 188 gkd->length = dp->d_mediasize - gkd->offset; 189 gkd->di.mediasize = gkd->length; 190 g_io_deliver(bp, 0); 191 } 192 193 static void 194 g_disk_setstate(struct bio *bp, struct g_disk_softc *sc) 195 { 196 const char *cmd; 197 198 memcpy(&sc->state, bp->bio_data, sizeof(sc->state)); 199 if (sc->led[0] != 0) { 200 switch (sc->state) { 201 case G_STATE_FAILED: 202 cmd = "1"; 203 break; 204 case G_STATE_REBUILD: 205 cmd = "f5"; 206 break; 207 case G_STATE_RESYNC: 208 cmd = "f1"; 209 break; 210 default: 211 cmd = ""; 212 break; 213 } 214 led_set(sc->led, cmd); 215 } 216 g_io_deliver(bp, 0); 217 } 218 219 static void 220 g_disk_done(struct bio *bp) 221 { 222 struct bintime now; 223 struct bio *bp2; 224 struct g_disk_softc *sc; 225 226 /* See "notes" for why we need a mutex here */ 227 /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */ 228 bp2 = bp->bio_parent; 229 sc = bp2->bio_to->private; 230 bp->bio_completed = bp->bio_length - bp->bio_resid; 231 binuptime(&now); 232 mtx_lock(&sc->done_mtx); 233 if (bp2->bio_error == 0) 234 bp2->bio_error = bp->bio_error; 235 bp2->bio_completed += bp->bio_completed; 236 237 switch (bp->bio_cmd) { 238 case BIO_ZONE: 239 bcopy(&bp->bio_zone, &bp2->bio_zone, sizeof(bp->bio_zone)); 240 /*FALLTHROUGH*/ 241 case BIO_READ: 242 case BIO_WRITE: 243 case BIO_DELETE: 244 case BIO_FLUSH: 245 devstat_end_transaction_bio_bt(sc->dp->d_devstat, bp, &now); 246 break; 247 default: 248 break; 249 } 250 bp2->bio_inbed++; 251 if (bp2->bio_children == bp2->bio_inbed) { 252 mtx_unlock(&sc->done_mtx); 253 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed; 254 g_io_deliver(bp2, bp2->bio_error); 255 } else 256 mtx_unlock(&sc->done_mtx); 257 g_destroy_bio(bp); 258 } 259 260 static int 261 g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td) 262 { 263 struct disk *dp; 264 struct g_disk_softc *sc; 265 int error; 266 267 sc = pp->private; 268 dp = sc->dp; 269 270 if (dp->d_ioctl == NULL) 271 return (ENOIOCTL); 272 error = dp->d_ioctl(dp, cmd, data, fflag, td); 273 return (error); 274 } 275 276 static off_t 277 g_disk_maxsize(struct disk *dp, struct bio *bp) 278 { 279 if (bp->bio_cmd == BIO_DELETE) 280 return (dp->d_delmaxsize); 281 return (dp->d_maxsize); 282 } 283 284 static int 285 g_disk_maxsegs(struct disk *dp, struct bio *bp) 286 { 287 return ((g_disk_maxsize(dp, bp) / PAGE_SIZE) + 1); 288 } 289 290 static void 291 g_disk_advance(struct disk *dp, struct bio *bp, off_t off) 292 { 293 294 bp->bio_offset += off; 295 bp->bio_length -= off; 296 297 if ((bp->bio_flags & BIO_VLIST) != 0) { 298 bus_dma_segment_t *seg, *end; 299 300 seg = (bus_dma_segment_t *)bp->bio_data; 301 end = (bus_dma_segment_t *)bp->bio_data + bp->bio_ma_n; 302 off += bp->bio_ma_offset; 303 while (off >= seg->ds_len) { 304 KASSERT((seg != end), 305 ("vlist request runs off the end")); 306 off -= seg->ds_len; 307 seg++; 308 } 309 bp->bio_ma_offset = off; 310 bp->bio_ma_n = end - seg; 311 bp->bio_data = (void *)seg; 312 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 313 bp->bio_ma += off / PAGE_SIZE; 314 bp->bio_ma_offset += off; 315 bp->bio_ma_offset %= PAGE_SIZE; 316 bp->bio_ma_n -= off / PAGE_SIZE; 317 } else { 318 bp->bio_data += off; 319 } 320 } 321 322 static void 323 g_disk_seg_limit(bus_dma_segment_t *seg, off_t *poffset, 324 off_t *plength, int *ppages) 325 { 326 uintptr_t seg_page_base; 327 uintptr_t seg_page_end; 328 off_t offset; 329 off_t length; 330 int seg_pages; 331 332 offset = *poffset; 333 length = *plength; 334 335 if (length > seg->ds_len - offset) 336 length = seg->ds_len - offset; 337 338 seg_page_base = trunc_page(seg->ds_addr + offset); 339 seg_page_end = round_page(seg->ds_addr + offset + length); 340 seg_pages = (seg_page_end - seg_page_base) >> PAGE_SHIFT; 341 342 if (seg_pages > *ppages) { 343 seg_pages = *ppages; 344 length = (seg_page_base + (seg_pages << PAGE_SHIFT)) - 345 (seg->ds_addr + offset); 346 } 347 348 *poffset = 0; 349 *plength -= length; 350 *ppages -= seg_pages; 351 } 352 353 static off_t 354 g_disk_vlist_limit(struct disk *dp, struct bio *bp, bus_dma_segment_t **pendseg) 355 { 356 bus_dma_segment_t *seg, *end; 357 off_t residual; 358 off_t offset; 359 int pages; 360 361 seg = (bus_dma_segment_t *)bp->bio_data; 362 end = (bus_dma_segment_t *)bp->bio_data + bp->bio_ma_n; 363 residual = bp->bio_length; 364 offset = bp->bio_ma_offset; 365 pages = g_disk_maxsegs(dp, bp); 366 while (residual != 0 && pages != 0) { 367 KASSERT((seg != end), 368 ("vlist limit runs off the end")); 369 g_disk_seg_limit(seg, &offset, &residual, &pages); 370 seg++; 371 } 372 if (pendseg != NULL) 373 *pendseg = seg; 374 return (residual); 375 } 376 377 static bool 378 g_disk_limit(struct disk *dp, struct bio *bp) 379 { 380 bool limited = false; 381 off_t maxsz; 382 383 maxsz = g_disk_maxsize(dp, bp); 384 385 /* 386 * XXX: If we have a stripesize we should really use it here. 387 * Care should be taken in the delete case if this is done 388 * as deletes can be very sensitive to size given how they 389 * are processed. 390 */ 391 if (bp->bio_length > maxsz) { 392 bp->bio_length = maxsz; 393 limited = true; 394 } 395 396 if ((bp->bio_flags & BIO_VLIST) != 0) { 397 bus_dma_segment_t *firstseg, *endseg; 398 off_t residual; 399 400 firstseg = (bus_dma_segment_t*)bp->bio_data; 401 residual = g_disk_vlist_limit(dp, bp, &endseg); 402 if (residual != 0) { 403 bp->bio_ma_n = endseg - firstseg; 404 bp->bio_length -= residual; 405 limited = true; 406 } 407 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 408 bp->bio_ma_n = 409 howmany(bp->bio_ma_offset + bp->bio_length, PAGE_SIZE); 410 } 411 412 return (limited); 413 } 414 415 static void 416 g_disk_start(struct bio *bp) 417 { 418 struct bio *bp2, *bp3; 419 struct disk *dp; 420 struct g_disk_softc *sc; 421 int error; 422 off_t off; 423 424 sc = bp->bio_to->private; 425 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) { 426 g_io_deliver(bp, ENXIO); 427 return; 428 } 429 error = EJUSTRETURN; 430 switch(bp->bio_cmd) { 431 case BIO_DELETE: 432 if (!(dp->d_flags & DISKFLAG_CANDELETE)) { 433 error = EOPNOTSUPP; 434 break; 435 } 436 /* fall-through */ 437 case BIO_READ: 438 case BIO_WRITE: 439 KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0 || 440 (bp->bio_flags & BIO_UNMAPPED) == 0, 441 ("unmapped bio not supported by disk %s", dp->d_name)); 442 off = 0; 443 bp3 = NULL; 444 bp2 = g_clone_bio(bp); 445 if (bp2 == NULL) { 446 error = ENOMEM; 447 break; 448 } 449 for (;;) { 450 if (g_disk_limit(dp, bp2)) { 451 off += bp2->bio_length; 452 453 /* 454 * To avoid a race, we need to grab the next bio 455 * before we schedule this one. See "notes". 456 */ 457 bp3 = g_clone_bio(bp); 458 if (bp3 == NULL) 459 bp->bio_error = ENOMEM; 460 } 461 bp2->bio_done = g_disk_done; 462 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 463 bp2->bio_bcount = bp2->bio_length; 464 bp2->bio_disk = dp; 465 mtx_lock(&sc->start_mtx); 466 devstat_start_transaction_bio(dp->d_devstat, bp2); 467 mtx_unlock(&sc->start_mtx); 468 dp->d_strategy(bp2); 469 470 if (bp3 == NULL) 471 break; 472 473 bp2 = bp3; 474 bp3 = NULL; 475 g_disk_advance(dp, bp2, off); 476 } 477 break; 478 case BIO_GETATTR: 479 /* Give the driver a chance to override */ 480 if (dp->d_getattr != NULL) { 481 if (bp->bio_disk == NULL) 482 bp->bio_disk = dp; 483 error = dp->d_getattr(bp); 484 if (error != -1) 485 break; 486 error = EJUSTRETURN; 487 } 488 if (g_handleattr_int(bp, "GEOM::candelete", 489 (dp->d_flags & DISKFLAG_CANDELETE) != 0)) 490 break; 491 else if (g_handleattr_int(bp, "GEOM::fwsectors", 492 dp->d_fwsectors)) 493 break; 494 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 495 break; 496 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 497 break; 498 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident)) 499 break; 500 else if (g_handleattr_uint16_t(bp, "GEOM::hba_vendor", 501 dp->d_hba_vendor)) 502 break; 503 else if (g_handleattr_uint16_t(bp, "GEOM::hba_device", 504 dp->d_hba_device)) 505 break; 506 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subvendor", 507 dp->d_hba_subvendor)) 508 break; 509 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subdevice", 510 dp->d_hba_subdevice)) 511 break; 512 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 513 g_disk_kerneldump(bp, dp); 514 else if (!strcmp(bp->bio_attribute, "GEOM::setstate")) 515 g_disk_setstate(bp, sc); 516 else if (g_handleattr_uint16_t(bp, "GEOM::rotation_rate", 517 dp->d_rotation_rate)) 518 break; 519 else 520 error = ENOIOCTL; 521 break; 522 case BIO_FLUSH: 523 g_trace(G_T_BIO, "g_disk_flushcache(%s)", 524 bp->bio_to->name); 525 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) { 526 error = EOPNOTSUPP; 527 break; 528 } 529 /*FALLTHROUGH*/ 530 case BIO_ZONE: 531 if (bp->bio_cmd == BIO_ZONE) { 532 if (!(dp->d_flags & DISKFLAG_CANZONE)) { 533 error = EOPNOTSUPP; 534 break; 535 } 536 g_trace(G_T_BIO, "g_disk_zone(%s)", 537 bp->bio_to->name); 538 } 539 bp2 = g_clone_bio(bp); 540 if (bp2 == NULL) { 541 g_io_deliver(bp, ENOMEM); 542 return; 543 } 544 bp2->bio_done = g_disk_done; 545 bp2->bio_disk = dp; 546 mtx_lock(&sc->start_mtx); 547 devstat_start_transaction_bio(dp->d_devstat, bp2); 548 mtx_unlock(&sc->start_mtx); 549 dp->d_strategy(bp2); 550 break; 551 default: 552 error = EOPNOTSUPP; 553 break; 554 } 555 if (error != EJUSTRETURN) 556 g_io_deliver(bp, error); 557 return; 558 } 559 560 static void 561 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 562 { 563 struct bio *bp; 564 struct disk *dp; 565 struct g_disk_softc *sc; 566 char *buf; 567 int res = 0; 568 569 sc = gp->softc; 570 if (sc == NULL || (dp = sc->dp) == NULL) 571 return; 572 if (indent == NULL) { 573 sbuf_printf(sb, " hd %u", dp->d_fwheads); 574 sbuf_printf(sb, " sc %u", dp->d_fwsectors); 575 return; 576 } 577 if (pp != NULL) { 578 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", 579 indent, dp->d_fwheads); 580 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", 581 indent, dp->d_fwsectors); 582 583 /* 584 * "rotationrate" is a little complicated, because the value 585 * returned by the drive might not be the RPM; 0 and 1 are 586 * special cases, and there's also a valid range. 587 */ 588 sbuf_printf(sb, "%s<rotationrate>", indent); 589 if (dp->d_rotation_rate == DISK_RR_UNKNOWN) /* Old drives */ 590 sbuf_printf(sb, "unknown"); /* don't report RPM. */ 591 else if (dp->d_rotation_rate == DISK_RR_NON_ROTATING) 592 sbuf_printf(sb, ""); 593 else if ((dp->d_rotation_rate >= DISK_RR_MIN) && 594 (dp->d_rotation_rate <= DISK_RR_MAX)) 595 sbuf_printf(sb, "%u", dp->d_rotation_rate); 596 else 597 sbuf_printf(sb, "invalid"); 598 sbuf_printf(sb, "</rotationrate>\n"); 599 if (dp->d_getattr != NULL) { 600 buf = g_malloc(DISK_IDENT_SIZE, M_WAITOK); 601 bp = g_alloc_bio(); 602 bp->bio_disk = dp; 603 bp->bio_attribute = "GEOM::ident"; 604 bp->bio_length = DISK_IDENT_SIZE; 605 bp->bio_data = buf; 606 res = dp->d_getattr(bp); 607 sbuf_printf(sb, "%s<ident>", indent); 608 g_conf_printf_escaped(sb, "%s", 609 res == 0 ? buf: dp->d_ident); 610 sbuf_printf(sb, "</ident>\n"); 611 bp->bio_attribute = "GEOM::lunid"; 612 bp->bio_length = DISK_IDENT_SIZE; 613 bp->bio_data = buf; 614 if (dp->d_getattr(bp) == 0) { 615 sbuf_printf(sb, "%s<lunid>", indent); 616 g_conf_printf_escaped(sb, "%s", buf); 617 sbuf_printf(sb, "</lunid>\n"); 618 } 619 bp->bio_attribute = "GEOM::lunname"; 620 bp->bio_length = DISK_IDENT_SIZE; 621 bp->bio_data = buf; 622 if (dp->d_getattr(bp) == 0) { 623 sbuf_printf(sb, "%s<lunname>", indent); 624 g_conf_printf_escaped(sb, "%s", buf); 625 sbuf_printf(sb, "</lunname>\n"); 626 } 627 g_destroy_bio(bp); 628 g_free(buf); 629 } else { 630 sbuf_printf(sb, "%s<ident>", indent); 631 g_conf_printf_escaped(sb, "%s", dp->d_ident); 632 sbuf_printf(sb, "</ident>\n"); 633 } 634 sbuf_printf(sb, "%s<descr>", indent); 635 g_conf_printf_escaped(sb, "%s", dp->d_descr); 636 sbuf_printf(sb, "</descr>\n"); 637 } 638 } 639 640 static void 641 g_disk_resize(void *ptr, int flag) 642 { 643 struct disk *dp; 644 struct g_geom *gp; 645 struct g_provider *pp; 646 647 if (flag == EV_CANCEL) 648 return; 649 g_topology_assert(); 650 651 dp = ptr; 652 gp = dp->d_geom; 653 654 if (dp->d_destroyed || gp == NULL) 655 return; 656 657 LIST_FOREACH(pp, &gp->provider, provider) { 658 if (pp->sectorsize != 0 && 659 pp->sectorsize != dp->d_sectorsize) 660 g_wither_provider(pp, ENXIO); 661 else 662 g_resize_provider(pp, dp->d_mediasize); 663 } 664 } 665 666 static void 667 g_disk_create(void *arg, int flag) 668 { 669 struct g_geom *gp; 670 struct g_provider *pp; 671 struct disk *dp; 672 struct g_disk_softc *sc; 673 char tmpstr[80]; 674 675 if (flag == EV_CANCEL) 676 return; 677 g_topology_assert(); 678 dp = arg; 679 680 mtx_pool_lock(mtxpool_sleep, dp); 681 dp->d_init_level = DISK_INIT_START; 682 683 /* 684 * If the disk has already gone away, we can just stop here and 685 * call the user's callback to tell him we've cleaned things up. 686 */ 687 if (dp->d_goneflag != 0) { 688 mtx_pool_unlock(mtxpool_sleep, dp); 689 if (dp->d_gone != NULL) 690 dp->d_gone(dp); 691 return; 692 } 693 mtx_pool_unlock(mtxpool_sleep, dp); 694 695 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 696 mtx_init(&sc->start_mtx, "g_disk_start", NULL, MTX_DEF); 697 mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF); 698 sc->dp = dp; 699 gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit); 700 gp->softc = sc; 701 pp = g_new_providerf(gp, "%s", gp->name); 702 devstat_remove_entry(pp->stat); 703 pp->stat = NULL; 704 dp->d_devstat->id = pp; 705 pp->mediasize = dp->d_mediasize; 706 pp->sectorsize = dp->d_sectorsize; 707 pp->stripeoffset = dp->d_stripeoffset; 708 pp->stripesize = dp->d_stripesize; 709 if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0) 710 pp->flags |= G_PF_ACCEPT_UNMAPPED; 711 if ((dp->d_flags & DISKFLAG_DIRECT_COMPLETION) != 0) 712 pp->flags |= G_PF_DIRECT_SEND; 713 pp->flags |= G_PF_DIRECT_RECEIVE; 714 if (bootverbose) 715 printf("GEOM: new disk %s\n", gp->name); 716 sysctl_ctx_init(&sc->sysctl_ctx); 717 snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name); 718 sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx, 719 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name, 720 CTLFLAG_RD, 0, tmpstr); 721 if (sc->sysctl_tree != NULL) { 722 SYSCTL_ADD_STRING(&sc->sysctl_ctx, 723 SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led", 724 CTLFLAG_RWTUN, sc->led, sizeof(sc->led), 725 "LED name"); 726 } 727 pp->private = sc; 728 dp->d_geom = gp; 729 g_error_provider(pp, 0); 730 731 mtx_pool_lock(mtxpool_sleep, dp); 732 dp->d_init_level = DISK_INIT_DONE; 733 734 /* 735 * If the disk has gone away at this stage, start the withering 736 * process for it. 737 */ 738 if (dp->d_goneflag != 0) { 739 mtx_pool_unlock(mtxpool_sleep, dp); 740 g_wither_provider(pp, ENXIO); 741 return; 742 } 743 mtx_pool_unlock(mtxpool_sleep, dp); 744 745 } 746 747 /* 748 * We get this callback after all of the consumers have gone away, and just 749 * before the provider is freed. If the disk driver provided a d_gone 750 * callback, let them know that it is okay to free resources -- they won't 751 * be getting any more accesses from GEOM. 752 */ 753 static void 754 g_disk_providergone(struct g_provider *pp) 755 { 756 struct disk *dp; 757 struct g_disk_softc *sc; 758 759 sc = (struct g_disk_softc *)pp->private; 760 dp = sc->dp; 761 if (dp != NULL && dp->d_gone != NULL) 762 dp->d_gone(dp); 763 if (sc->sysctl_tree != NULL) { 764 sysctl_ctx_free(&sc->sysctl_ctx); 765 sc->sysctl_tree = NULL; 766 } 767 if (sc->led[0] != 0) { 768 led_set(sc->led, ""); 769 sc->led[0] = 0; 770 } 771 pp->private = NULL; 772 pp->geom->softc = NULL; 773 mtx_destroy(&sc->done_mtx); 774 mtx_destroy(&sc->start_mtx); 775 g_free(sc); 776 } 777 778 static void 779 g_disk_destroy(void *ptr, int flag) 780 { 781 struct disk *dp; 782 struct g_geom *gp; 783 struct g_disk_softc *sc; 784 785 g_topology_assert(); 786 dp = ptr; 787 gp = dp->d_geom; 788 if (gp != NULL) { 789 sc = gp->softc; 790 if (sc != NULL) 791 sc->dp = NULL; 792 dp->d_geom = NULL; 793 g_wither_geom(gp, ENXIO); 794 } 795 796 g_free(dp); 797 } 798 799 /* 800 * We only allow printable characters in disk ident, 801 * the rest is converted to 'x<HH>'. 802 */ 803 static void 804 g_disk_ident_adjust(char *ident, size_t size) 805 { 806 char *p, tmp[4], newid[DISK_IDENT_SIZE]; 807 808 newid[0] = '\0'; 809 for (p = ident; *p != '\0'; p++) { 810 if (isprint(*p)) { 811 tmp[0] = *p; 812 tmp[1] = '\0'; 813 } else { 814 snprintf(tmp, sizeof(tmp), "x%02hhx", 815 *(unsigned char *)p); 816 } 817 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid)) 818 break; 819 } 820 bzero(ident, size); 821 strlcpy(ident, newid, size); 822 } 823 824 struct disk * 825 disk_alloc(void) 826 { 827 828 return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO)); 829 } 830 831 void 832 disk_create(struct disk *dp, int version) 833 { 834 835 if (version != DISK_VERSION) { 836 printf("WARNING: Attempt to add disk %s%d %s", 837 dp->d_name, dp->d_unit, 838 " using incompatible ABI version of disk(9)\n"); 839 printf("WARNING: Ignoring disk %s%d\n", 840 dp->d_name, dp->d_unit); 841 return; 842 } 843 if (dp->d_flags & DISKFLAG_RESERVED) { 844 printf("WARNING: Attempt to add non-MPSAFE disk %s%d\n", 845 dp->d_name, dp->d_unit); 846 printf("WARNING: Ignoring disk %s%d\n", 847 dp->d_name, dp->d_unit); 848 return; 849 } 850 KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy")); 851 KASSERT(dp->d_name != NULL, ("disk_create need d_name")); 852 KASSERT(*dp->d_name != 0, ("disk_create need d_name")); 853 KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long")); 854 if (dp->d_devstat == NULL) 855 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit, 856 dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED, 857 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 858 dp->d_geom = NULL; 859 860 dp->d_init_level = DISK_INIT_NONE; 861 862 g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident)); 863 g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL); 864 } 865 866 void 867 disk_destroy(struct disk *dp) 868 { 869 870 g_cancel_event(dp); 871 dp->d_destroyed = 1; 872 if (dp->d_devstat != NULL) 873 devstat_remove_entry(dp->d_devstat); 874 g_post_event(g_disk_destroy, dp, M_WAITOK, NULL); 875 } 876 877 void 878 disk_gone(struct disk *dp) 879 { 880 struct g_geom *gp; 881 struct g_provider *pp; 882 883 mtx_pool_lock(mtxpool_sleep, dp); 884 dp->d_goneflag = 1; 885 886 /* 887 * If we're still in the process of creating this disk (the 888 * g_disk_create() function is still queued, or is in 889 * progress), the init level will not yet be DISK_INIT_DONE. 890 * 891 * If that is the case, g_disk_create() will see d_goneflag 892 * and take care of cleaning things up. 893 * 894 * If the disk has already been created, we default to 895 * withering the provider as usual below. 896 * 897 * If the caller has not set a d_gone() callback, he will 898 * not be any worse off by returning here, because the geom 899 * has not been fully setup in any case. 900 */ 901 if (dp->d_init_level < DISK_INIT_DONE) { 902 mtx_pool_unlock(mtxpool_sleep, dp); 903 return; 904 } 905 mtx_pool_unlock(mtxpool_sleep, dp); 906 907 gp = dp->d_geom; 908 if (gp != NULL) { 909 pp = LIST_FIRST(&gp->provider); 910 if (pp != NULL) { 911 KASSERT(LIST_NEXT(pp, provider) == NULL, 912 ("geom %p has more than one provider", gp)); 913 g_wither_provider(pp, ENXIO); 914 } 915 } 916 } 917 918 void 919 disk_attr_changed(struct disk *dp, const char *attr, int flag) 920 { 921 struct g_geom *gp; 922 struct g_provider *pp; 923 char devnamebuf[128]; 924 925 gp = dp->d_geom; 926 if (gp != NULL) 927 LIST_FOREACH(pp, &gp->provider, provider) 928 (void)g_attr_changed(pp, attr, flag); 929 snprintf(devnamebuf, sizeof(devnamebuf), "devname=%s%d", dp->d_name, 930 dp->d_unit); 931 devctl_notify("GEOM", "disk", attr, devnamebuf); 932 } 933 934 void 935 disk_media_changed(struct disk *dp, int flag) 936 { 937 struct g_geom *gp; 938 struct g_provider *pp; 939 940 gp = dp->d_geom; 941 if (gp != NULL) { 942 pp = LIST_FIRST(&gp->provider); 943 if (pp != NULL) { 944 KASSERT(LIST_NEXT(pp, provider) == NULL, 945 ("geom %p has more than one provider", gp)); 946 g_media_changed(pp, flag); 947 } 948 } 949 } 950 951 void 952 disk_media_gone(struct disk *dp, int flag) 953 { 954 struct g_geom *gp; 955 struct g_provider *pp; 956 957 gp = dp->d_geom; 958 if (gp != NULL) { 959 pp = LIST_FIRST(&gp->provider); 960 if (pp != NULL) { 961 KASSERT(LIST_NEXT(pp, provider) == NULL, 962 ("geom %p has more than one provider", gp)); 963 g_media_gone(pp, flag); 964 } 965 } 966 } 967 968 int 969 disk_resize(struct disk *dp, int flag) 970 { 971 972 if (dp->d_destroyed || dp->d_geom == NULL) 973 return (0); 974 975 return (g_post_event(g_disk_resize, dp, flag, NULL)); 976 } 977 978 static void 979 g_kern_disks(void *p, int flag __unused) 980 { 981 struct sbuf *sb; 982 struct g_geom *gp; 983 char *sp; 984 985 sb = p; 986 sp = ""; 987 g_topology_assert(); 988 LIST_FOREACH(gp, &g_disk_class.geom, geom) { 989 sbuf_printf(sb, "%s%s", sp, gp->name); 990 sp = " "; 991 } 992 sbuf_finish(sb); 993 } 994 995 static int 996 sysctl_disks(SYSCTL_HANDLER_ARGS) 997 { 998 int error; 999 struct sbuf *sb; 1000 1001 sb = sbuf_new_auto(); 1002 g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL); 1003 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 1004 sbuf_delete(sb); 1005 return error; 1006 } 1007 1008 SYSCTL_PROC(_kern, OID_AUTO, disks, 1009 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 1010 sysctl_disks, "A", "names of available disks");
Cache object: d14245d836b21ff074d0641478f6eeff
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