Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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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/11.2/sys/geom/geom_disk.c 329316 2018-02-15 15:33:17Z avg $"); 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 /* 122 * It would be better to defer this decision to d_open if 123 * it was able to take flags. 124 */ 125 if (w > 0 && (dp->d_flags & DISKFLAG_WRITE_PROTECT) != 0) 126 error = EROFS; 127 if (error == 0 && dp->d_open != NULL) 128 error = dp->d_open(dp); 129 if (bootverbose && error != 0) 130 printf("Opened disk %s -> %d\n", pp->name, error); 131 if (error != 0) 132 return (error); 133 pp->sectorsize = dp->d_sectorsize; 134 if (dp->d_maxsize == 0) { 135 printf("WARNING: Disk drive %s%d has no d_maxsize\n", 136 dp->d_name, dp->d_unit); 137 dp->d_maxsize = DFLTPHYS; 138 } 139 if (dp->d_delmaxsize == 0) { 140 if (bootverbose && dp->d_flags & DISKFLAG_CANDELETE) { 141 printf("WARNING: Disk drive %s%d has no " 142 "d_delmaxsize\n", dp->d_name, dp->d_unit); 143 } 144 dp->d_delmaxsize = dp->d_maxsize; 145 } 146 pp->stripeoffset = dp->d_stripeoffset; 147 pp->stripesize = dp->d_stripesize; 148 dp->d_flags |= DISKFLAG_OPEN; 149 /* 150 * Do not invoke resize event when initial size was zero. 151 * Some disks report its size only after first opening. 152 */ 153 if (pp->mediasize == 0) 154 pp->mediasize = dp->d_mediasize; 155 else 156 g_resize_provider(pp, dp->d_mediasize); 157 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 158 if (dp->d_close != NULL) { 159 error = dp->d_close(dp); 160 if (error != 0) 161 printf("Closed disk %s -> %d\n", 162 pp->name, error); 163 } 164 sc->state = G_STATE_ACTIVE; 165 if (sc->led[0] != 0) 166 led_set(sc->led, ""); 167 dp->d_flags &= ~DISKFLAG_OPEN; 168 } 169 return (error); 170 } 171 172 static void 173 g_disk_kerneldump(struct bio *bp, struct disk *dp) 174 { 175 struct g_kerneldump *gkd; 176 struct g_geom *gp; 177 178 gkd = (struct g_kerneldump*)bp->bio_data; 179 gp = bp->bio_to->geom; 180 g_trace(G_T_TOPOLOGY, "g_disk_kerneldump(%s, %jd, %jd)", 181 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 182 if (dp->d_dump == NULL) { 183 g_io_deliver(bp, ENODEV); 184 return; 185 } 186 gkd->di.dumper = dp->d_dump; 187 gkd->di.priv = dp; 188 gkd->di.blocksize = dp->d_sectorsize; 189 gkd->di.maxiosize = dp->d_maxsize; 190 gkd->di.mediaoffset = gkd->offset; 191 if ((gkd->offset + gkd->length) > dp->d_mediasize) 192 gkd->length = dp->d_mediasize - gkd->offset; 193 gkd->di.mediasize = gkd->length; 194 g_io_deliver(bp, 0); 195 } 196 197 static void 198 g_disk_setstate(struct bio *bp, struct g_disk_softc *sc) 199 { 200 const char *cmd; 201 202 memcpy(&sc->state, bp->bio_data, sizeof(sc->state)); 203 if (sc->led[0] != 0) { 204 switch (sc->state) { 205 case G_STATE_FAILED: 206 cmd = "1"; 207 break; 208 case G_STATE_REBUILD: 209 cmd = "f5"; 210 break; 211 case G_STATE_RESYNC: 212 cmd = "f1"; 213 break; 214 default: 215 cmd = ""; 216 break; 217 } 218 led_set(sc->led, cmd); 219 } 220 g_io_deliver(bp, 0); 221 } 222 223 static void 224 g_disk_done(struct bio *bp) 225 { 226 struct bintime now; 227 struct bio *bp2; 228 struct g_disk_softc *sc; 229 230 /* See "notes" for why we need a mutex here */ 231 /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */ 232 bp2 = bp->bio_parent; 233 sc = bp2->bio_to->private; 234 bp->bio_completed = bp->bio_length - bp->bio_resid; 235 binuptime(&now); 236 mtx_lock(&sc->done_mtx); 237 if (bp2->bio_error == 0) 238 bp2->bio_error = bp->bio_error; 239 bp2->bio_completed += bp->bio_completed; 240 241 switch (bp->bio_cmd) { 242 case BIO_ZONE: 243 bcopy(&bp->bio_zone, &bp2->bio_zone, sizeof(bp->bio_zone)); 244 /*FALLTHROUGH*/ 245 case BIO_READ: 246 case BIO_WRITE: 247 case BIO_DELETE: 248 case BIO_FLUSH: 249 devstat_end_transaction_bio_bt(sc->dp->d_devstat, bp, &now); 250 break; 251 default: 252 break; 253 } 254 bp2->bio_inbed++; 255 if (bp2->bio_children == bp2->bio_inbed) { 256 mtx_unlock(&sc->done_mtx); 257 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed; 258 g_io_deliver(bp2, bp2->bio_error); 259 } else 260 mtx_unlock(&sc->done_mtx); 261 g_destroy_bio(bp); 262 } 263 264 static int 265 g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td) 266 { 267 struct disk *dp; 268 struct g_disk_softc *sc; 269 int error; 270 271 sc = pp->private; 272 dp = sc->dp; 273 274 if (dp->d_ioctl == NULL) 275 return (ENOIOCTL); 276 error = dp->d_ioctl(dp, cmd, data, fflag, td); 277 return (error); 278 } 279 280 static off_t 281 g_disk_maxsize(struct disk *dp, struct bio *bp) 282 { 283 if (bp->bio_cmd == BIO_DELETE) 284 return (dp->d_delmaxsize); 285 return (dp->d_maxsize); 286 } 287 288 static int 289 g_disk_maxsegs(struct disk *dp, struct bio *bp) 290 { 291 return ((g_disk_maxsize(dp, bp) / PAGE_SIZE) + 1); 292 } 293 294 static void 295 g_disk_advance(struct disk *dp, struct bio *bp, off_t off) 296 { 297 298 bp->bio_offset += off; 299 bp->bio_length -= off; 300 301 if ((bp->bio_flags & BIO_VLIST) != 0) { 302 bus_dma_segment_t *seg, *end; 303 304 seg = (bus_dma_segment_t *)bp->bio_data; 305 end = (bus_dma_segment_t *)bp->bio_data + bp->bio_ma_n; 306 off += bp->bio_ma_offset; 307 while (off >= seg->ds_len) { 308 KASSERT((seg != end), 309 ("vlist request runs off the end")); 310 off -= seg->ds_len; 311 seg++; 312 } 313 bp->bio_ma_offset = off; 314 bp->bio_ma_n = end - seg; 315 bp->bio_data = (void *)seg; 316 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 317 bp->bio_ma += off / PAGE_SIZE; 318 bp->bio_ma_offset += off; 319 bp->bio_ma_offset %= PAGE_SIZE; 320 bp->bio_ma_n -= off / PAGE_SIZE; 321 } else { 322 bp->bio_data += off; 323 } 324 } 325 326 static void 327 g_disk_seg_limit(bus_dma_segment_t *seg, off_t *poffset, 328 off_t *plength, int *ppages) 329 { 330 uintptr_t seg_page_base; 331 uintptr_t seg_page_end; 332 off_t offset; 333 off_t length; 334 int seg_pages; 335 336 offset = *poffset; 337 length = *plength; 338 339 if (length > seg->ds_len - offset) 340 length = seg->ds_len - offset; 341 342 seg_page_base = trunc_page(seg->ds_addr + offset); 343 seg_page_end = round_page(seg->ds_addr + offset + length); 344 seg_pages = (seg_page_end - seg_page_base) >> PAGE_SHIFT; 345 346 if (seg_pages > *ppages) { 347 seg_pages = *ppages; 348 length = (seg_page_base + (seg_pages << PAGE_SHIFT)) - 349 (seg->ds_addr + offset); 350 } 351 352 *poffset = 0; 353 *plength -= length; 354 *ppages -= seg_pages; 355 } 356 357 static off_t 358 g_disk_vlist_limit(struct disk *dp, struct bio *bp, bus_dma_segment_t **pendseg) 359 { 360 bus_dma_segment_t *seg, *end; 361 off_t residual; 362 off_t offset; 363 int pages; 364 365 seg = (bus_dma_segment_t *)bp->bio_data; 366 end = (bus_dma_segment_t *)bp->bio_data + bp->bio_ma_n; 367 residual = bp->bio_length; 368 offset = bp->bio_ma_offset; 369 pages = g_disk_maxsegs(dp, bp); 370 while (residual != 0 && pages != 0) { 371 KASSERT((seg != end), 372 ("vlist limit runs off the end")); 373 g_disk_seg_limit(seg, &offset, &residual, &pages); 374 seg++; 375 } 376 if (pendseg != NULL) 377 *pendseg = seg; 378 return (residual); 379 } 380 381 static bool 382 g_disk_limit(struct disk *dp, struct bio *bp) 383 { 384 bool limited = false; 385 off_t maxsz; 386 387 maxsz = g_disk_maxsize(dp, bp); 388 389 /* 390 * XXX: If we have a stripesize we should really use it here. 391 * Care should be taken in the delete case if this is done 392 * as deletes can be very sensitive to size given how they 393 * are processed. 394 */ 395 if (bp->bio_length > maxsz) { 396 bp->bio_length = maxsz; 397 limited = true; 398 } 399 400 if ((bp->bio_flags & BIO_VLIST) != 0) { 401 bus_dma_segment_t *firstseg, *endseg; 402 off_t residual; 403 404 firstseg = (bus_dma_segment_t*)bp->bio_data; 405 residual = g_disk_vlist_limit(dp, bp, &endseg); 406 if (residual != 0) { 407 bp->bio_ma_n = endseg - firstseg; 408 bp->bio_length -= residual; 409 limited = true; 410 } 411 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 412 bp->bio_ma_n = 413 howmany(bp->bio_ma_offset + bp->bio_length, PAGE_SIZE); 414 } 415 416 return (limited); 417 } 418 419 static void 420 g_disk_start(struct bio *bp) 421 { 422 struct bio *bp2, *bp3; 423 struct disk *dp; 424 struct g_disk_softc *sc; 425 int error; 426 off_t off; 427 428 sc = bp->bio_to->private; 429 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) { 430 g_io_deliver(bp, ENXIO); 431 return; 432 } 433 error = EJUSTRETURN; 434 switch(bp->bio_cmd) { 435 case BIO_DELETE: 436 if (!(dp->d_flags & DISKFLAG_CANDELETE)) { 437 error = EOPNOTSUPP; 438 break; 439 } 440 /* fall-through */ 441 case BIO_READ: 442 case BIO_WRITE: 443 KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0 || 444 (bp->bio_flags & BIO_UNMAPPED) == 0, 445 ("unmapped bio not supported by disk %s", dp->d_name)); 446 off = 0; 447 bp3 = NULL; 448 bp2 = g_clone_bio(bp); 449 if (bp2 == NULL) { 450 error = ENOMEM; 451 break; 452 } 453 for (;;) { 454 if (g_disk_limit(dp, bp2)) { 455 off += bp2->bio_length; 456 457 /* 458 * To avoid a race, we need to grab the next bio 459 * before we schedule this one. See "notes". 460 */ 461 bp3 = g_clone_bio(bp); 462 if (bp3 == NULL) 463 bp->bio_error = ENOMEM; 464 } 465 bp2->bio_done = g_disk_done; 466 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 467 bp2->bio_bcount = bp2->bio_length; 468 bp2->bio_disk = dp; 469 mtx_lock(&sc->start_mtx); 470 devstat_start_transaction_bio(dp->d_devstat, bp2); 471 mtx_unlock(&sc->start_mtx); 472 dp->d_strategy(bp2); 473 474 if (bp3 == NULL) 475 break; 476 477 bp2 = bp3; 478 bp3 = NULL; 479 g_disk_advance(dp, bp2, off); 480 } 481 break; 482 case BIO_GETATTR: 483 /* Give the driver a chance to override */ 484 if (dp->d_getattr != NULL) { 485 if (bp->bio_disk == NULL) 486 bp->bio_disk = dp; 487 error = dp->d_getattr(bp); 488 if (error != -1) 489 break; 490 error = EJUSTRETURN; 491 } 492 if (g_handleattr_int(bp, "GEOM::candelete", 493 (dp->d_flags & DISKFLAG_CANDELETE) != 0)) 494 break; 495 else if (g_handleattr_int(bp, "GEOM::fwsectors", 496 dp->d_fwsectors)) 497 break; 498 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 499 break; 500 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 501 break; 502 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident)) 503 break; 504 else if (g_handleattr_str(bp, "GEOM::descr", dp->d_descr)) 505 break; 506 else if (g_handleattr_uint16_t(bp, "GEOM::hba_vendor", 507 dp->d_hba_vendor)) 508 break; 509 else if (g_handleattr_uint16_t(bp, "GEOM::hba_device", 510 dp->d_hba_device)) 511 break; 512 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subvendor", 513 dp->d_hba_subvendor)) 514 break; 515 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subdevice", 516 dp->d_hba_subdevice)) 517 break; 518 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 519 g_disk_kerneldump(bp, dp); 520 else if (!strcmp(bp->bio_attribute, "GEOM::setstate")) 521 g_disk_setstate(bp, sc); 522 else if (g_handleattr_uint16_t(bp, "GEOM::rotation_rate", 523 dp->d_rotation_rate)) 524 break; 525 else 526 error = ENOIOCTL; 527 break; 528 case BIO_FLUSH: 529 g_trace(G_T_BIO, "g_disk_flushcache(%s)", 530 bp->bio_to->name); 531 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) { 532 error = EOPNOTSUPP; 533 break; 534 } 535 /*FALLTHROUGH*/ 536 case BIO_ZONE: 537 if (bp->bio_cmd == BIO_ZONE) { 538 if (!(dp->d_flags & DISKFLAG_CANZONE)) { 539 error = EOPNOTSUPP; 540 break; 541 } 542 g_trace(G_T_BIO, "g_disk_zone(%s)", 543 bp->bio_to->name); 544 } 545 bp2 = g_clone_bio(bp); 546 if (bp2 == NULL) { 547 g_io_deliver(bp, ENOMEM); 548 return; 549 } 550 bp2->bio_done = g_disk_done; 551 bp2->bio_disk = dp; 552 mtx_lock(&sc->start_mtx); 553 devstat_start_transaction_bio(dp->d_devstat, bp2); 554 mtx_unlock(&sc->start_mtx); 555 dp->d_strategy(bp2); 556 break; 557 default: 558 error = EOPNOTSUPP; 559 break; 560 } 561 if (error != EJUSTRETURN) 562 g_io_deliver(bp, error); 563 return; 564 } 565 566 static void 567 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 568 { 569 struct bio *bp; 570 struct disk *dp; 571 struct g_disk_softc *sc; 572 char *buf; 573 int res = 0; 574 575 sc = gp->softc; 576 if (sc == NULL || (dp = sc->dp) == NULL) 577 return; 578 if (indent == NULL) { 579 sbuf_printf(sb, " hd %u", dp->d_fwheads); 580 sbuf_printf(sb, " sc %u", dp->d_fwsectors); 581 return; 582 } 583 if (pp != NULL) { 584 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", 585 indent, dp->d_fwheads); 586 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", 587 indent, dp->d_fwsectors); 588 589 /* 590 * "rotationrate" is a little complicated, because the value 591 * returned by the drive might not be the RPM; 0 and 1 are 592 * special cases, and there's also a valid range. 593 */ 594 sbuf_printf(sb, "%s<rotationrate>", indent); 595 if (dp->d_rotation_rate == DISK_RR_UNKNOWN) /* Old drives */ 596 sbuf_printf(sb, "unknown"); /* don't report RPM. */ 597 else if (dp->d_rotation_rate == DISK_RR_NON_ROTATING) 598 sbuf_printf(sb, ""); 599 else if ((dp->d_rotation_rate >= DISK_RR_MIN) && 600 (dp->d_rotation_rate <= DISK_RR_MAX)) 601 sbuf_printf(sb, "%u", dp->d_rotation_rate); 602 else 603 sbuf_printf(sb, "invalid"); 604 sbuf_printf(sb, "</rotationrate>\n"); 605 if (dp->d_getattr != NULL) { 606 buf = g_malloc(DISK_IDENT_SIZE, M_WAITOK); 607 bp = g_alloc_bio(); 608 bp->bio_disk = dp; 609 bp->bio_attribute = "GEOM::ident"; 610 bp->bio_length = DISK_IDENT_SIZE; 611 bp->bio_data = buf; 612 res = dp->d_getattr(bp); 613 sbuf_printf(sb, "%s<ident>", indent); 614 g_conf_printf_escaped(sb, "%s", 615 res == 0 ? buf: dp->d_ident); 616 sbuf_printf(sb, "</ident>\n"); 617 bp->bio_attribute = "GEOM::lunid"; 618 bp->bio_length = DISK_IDENT_SIZE; 619 bp->bio_data = buf; 620 if (dp->d_getattr(bp) == 0) { 621 sbuf_printf(sb, "%s<lunid>", indent); 622 g_conf_printf_escaped(sb, "%s", buf); 623 sbuf_printf(sb, "</lunid>\n"); 624 } 625 bp->bio_attribute = "GEOM::lunname"; 626 bp->bio_length = DISK_IDENT_SIZE; 627 bp->bio_data = buf; 628 if (dp->d_getattr(bp) == 0) { 629 sbuf_printf(sb, "%s<lunname>", indent); 630 g_conf_printf_escaped(sb, "%s", buf); 631 sbuf_printf(sb, "</lunname>\n"); 632 } 633 g_destroy_bio(bp); 634 g_free(buf); 635 } else { 636 sbuf_printf(sb, "%s<ident>", indent); 637 g_conf_printf_escaped(sb, "%s", dp->d_ident); 638 sbuf_printf(sb, "</ident>\n"); 639 } 640 sbuf_printf(sb, "%s<descr>", indent); 641 g_conf_printf_escaped(sb, "%s", dp->d_descr); 642 sbuf_printf(sb, "</descr>\n"); 643 } 644 } 645 646 static void 647 g_disk_resize(void *ptr, int flag) 648 { 649 struct disk *dp; 650 struct g_geom *gp; 651 struct g_provider *pp; 652 653 if (flag == EV_CANCEL) 654 return; 655 g_topology_assert(); 656 657 dp = ptr; 658 gp = dp->d_geom; 659 660 if (dp->d_destroyed || gp == NULL) 661 return; 662 663 LIST_FOREACH(pp, &gp->provider, provider) { 664 if (pp->sectorsize != 0 && 665 pp->sectorsize != dp->d_sectorsize) 666 g_wither_provider(pp, ENXIO); 667 else 668 g_resize_provider(pp, dp->d_mediasize); 669 } 670 } 671 672 static void 673 g_disk_create(void *arg, int flag) 674 { 675 struct g_geom *gp; 676 struct g_provider *pp; 677 struct disk *dp; 678 struct g_disk_softc *sc; 679 char tmpstr[80]; 680 681 if (flag == EV_CANCEL) 682 return; 683 g_topology_assert(); 684 dp = arg; 685 686 mtx_pool_lock(mtxpool_sleep, dp); 687 dp->d_init_level = DISK_INIT_START; 688 689 /* 690 * If the disk has already gone away, we can just stop here and 691 * call the user's callback to tell him we've cleaned things up. 692 */ 693 if (dp->d_goneflag != 0) { 694 mtx_pool_unlock(mtxpool_sleep, dp); 695 if (dp->d_gone != NULL) 696 dp->d_gone(dp); 697 return; 698 } 699 mtx_pool_unlock(mtxpool_sleep, dp); 700 701 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 702 mtx_init(&sc->start_mtx, "g_disk_start", NULL, MTX_DEF); 703 mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF); 704 sc->dp = dp; 705 gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit); 706 gp->softc = sc; 707 pp = g_new_providerf(gp, "%s", gp->name); 708 devstat_remove_entry(pp->stat); 709 pp->stat = NULL; 710 dp->d_devstat->id = pp; 711 pp->mediasize = dp->d_mediasize; 712 pp->sectorsize = dp->d_sectorsize; 713 pp->stripeoffset = dp->d_stripeoffset; 714 pp->stripesize = dp->d_stripesize; 715 if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0) 716 pp->flags |= G_PF_ACCEPT_UNMAPPED; 717 if ((dp->d_flags & DISKFLAG_DIRECT_COMPLETION) != 0) 718 pp->flags |= G_PF_DIRECT_SEND; 719 pp->flags |= G_PF_DIRECT_RECEIVE; 720 if (bootverbose) 721 printf("GEOM: new disk %s\n", gp->name); 722 sysctl_ctx_init(&sc->sysctl_ctx); 723 snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name); 724 sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx, 725 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name, 726 CTLFLAG_RD, 0, tmpstr); 727 if (sc->sysctl_tree != NULL) { 728 SYSCTL_ADD_STRING(&sc->sysctl_ctx, 729 SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led", 730 CTLFLAG_RWTUN, sc->led, sizeof(sc->led), 731 "LED name"); 732 } 733 pp->private = sc; 734 dp->d_geom = gp; 735 g_error_provider(pp, 0); 736 737 mtx_pool_lock(mtxpool_sleep, dp); 738 dp->d_init_level = DISK_INIT_DONE; 739 740 /* 741 * If the disk has gone away at this stage, start the withering 742 * process for it. 743 */ 744 if (dp->d_goneflag != 0) { 745 mtx_pool_unlock(mtxpool_sleep, dp); 746 g_wither_provider(pp, ENXIO); 747 return; 748 } 749 mtx_pool_unlock(mtxpool_sleep, dp); 750 751 } 752 753 /* 754 * We get this callback after all of the consumers have gone away, and just 755 * before the provider is freed. If the disk driver provided a d_gone 756 * callback, let them know that it is okay to free resources -- they won't 757 * be getting any more accesses from GEOM. 758 */ 759 static void 760 g_disk_providergone(struct g_provider *pp) 761 { 762 struct disk *dp; 763 struct g_disk_softc *sc; 764 765 sc = (struct g_disk_softc *)pp->private; 766 dp = sc->dp; 767 if (dp != NULL && dp->d_gone != NULL) 768 dp->d_gone(dp); 769 if (sc->sysctl_tree != NULL) { 770 sysctl_ctx_free(&sc->sysctl_ctx); 771 sc->sysctl_tree = NULL; 772 } 773 if (sc->led[0] != 0) { 774 led_set(sc->led, ""); 775 sc->led[0] = 0; 776 } 777 pp->private = NULL; 778 pp->geom->softc = NULL; 779 mtx_destroy(&sc->done_mtx); 780 mtx_destroy(&sc->start_mtx); 781 g_free(sc); 782 } 783 784 static void 785 g_disk_destroy(void *ptr, int flag) 786 { 787 struct disk *dp; 788 struct g_geom *gp; 789 struct g_disk_softc *sc; 790 791 g_topology_assert(); 792 dp = ptr; 793 gp = dp->d_geom; 794 if (gp != NULL) { 795 sc = gp->softc; 796 if (sc != NULL) 797 sc->dp = NULL; 798 dp->d_geom = NULL; 799 g_wither_geom(gp, ENXIO); 800 } 801 802 g_free(dp); 803 } 804 805 /* 806 * We only allow printable characters in disk ident, 807 * the rest is converted to 'x<HH>'. 808 */ 809 static void 810 g_disk_ident_adjust(char *ident, size_t size) 811 { 812 char *p, tmp[4], newid[DISK_IDENT_SIZE]; 813 814 newid[0] = '\0'; 815 for (p = ident; *p != '\0'; p++) { 816 if (isprint(*p)) { 817 tmp[0] = *p; 818 tmp[1] = '\0'; 819 } else { 820 snprintf(tmp, sizeof(tmp), "x%02hhx", 821 *(unsigned char *)p); 822 } 823 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid)) 824 break; 825 } 826 bzero(ident, size); 827 strlcpy(ident, newid, size); 828 } 829 830 struct disk * 831 disk_alloc(void) 832 { 833 834 return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO)); 835 } 836 837 void 838 disk_create(struct disk *dp, int version) 839 { 840 841 if (version != DISK_VERSION) { 842 printf("WARNING: Attempt to add disk %s%d %s", 843 dp->d_name, dp->d_unit, 844 " using incompatible ABI version of disk(9)\n"); 845 printf("WARNING: Ignoring disk %s%d\n", 846 dp->d_name, dp->d_unit); 847 return; 848 } 849 if (dp->d_flags & DISKFLAG_RESERVED) { 850 printf("WARNING: Attempt to add non-MPSAFE disk %s%d\n", 851 dp->d_name, dp->d_unit); 852 printf("WARNING: Ignoring disk %s%d\n", 853 dp->d_name, dp->d_unit); 854 return; 855 } 856 KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy")); 857 KASSERT(dp->d_name != NULL, ("disk_create need d_name")); 858 KASSERT(*dp->d_name != 0, ("disk_create need d_name")); 859 KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long")); 860 if (dp->d_devstat == NULL) 861 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit, 862 dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED, 863 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 864 dp->d_geom = NULL; 865 866 dp->d_init_level = DISK_INIT_NONE; 867 868 g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident)); 869 g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL); 870 } 871 872 void 873 disk_destroy(struct disk *dp) 874 { 875 876 g_cancel_event(dp); 877 dp->d_destroyed = 1; 878 if (dp->d_devstat != NULL) 879 devstat_remove_entry(dp->d_devstat); 880 g_post_event(g_disk_destroy, dp, M_WAITOK, NULL); 881 } 882 883 void 884 disk_gone(struct disk *dp) 885 { 886 struct g_geom *gp; 887 struct g_provider *pp; 888 889 mtx_pool_lock(mtxpool_sleep, dp); 890 dp->d_goneflag = 1; 891 892 /* 893 * If we're still in the process of creating this disk (the 894 * g_disk_create() function is still queued, or is in 895 * progress), the init level will not yet be DISK_INIT_DONE. 896 * 897 * If that is the case, g_disk_create() will see d_goneflag 898 * and take care of cleaning things up. 899 * 900 * If the disk has already been created, we default to 901 * withering the provider as usual below. 902 * 903 * If the caller has not set a d_gone() callback, he will 904 * not be any worse off by returning here, because the geom 905 * has not been fully setup in any case. 906 */ 907 if (dp->d_init_level < DISK_INIT_DONE) { 908 mtx_pool_unlock(mtxpool_sleep, dp); 909 return; 910 } 911 mtx_pool_unlock(mtxpool_sleep, dp); 912 913 gp = dp->d_geom; 914 if (gp != NULL) { 915 pp = LIST_FIRST(&gp->provider); 916 if (pp != NULL) { 917 KASSERT(LIST_NEXT(pp, provider) == NULL, 918 ("geom %p has more than one provider", gp)); 919 g_wither_provider(pp, ENXIO); 920 } 921 } 922 } 923 924 void 925 disk_attr_changed(struct disk *dp, const char *attr, int flag) 926 { 927 struct g_geom *gp; 928 struct g_provider *pp; 929 char devnamebuf[128]; 930 931 gp = dp->d_geom; 932 if (gp != NULL) 933 LIST_FOREACH(pp, &gp->provider, provider) 934 (void)g_attr_changed(pp, attr, flag); 935 snprintf(devnamebuf, sizeof(devnamebuf), "devname=%s%d", dp->d_name, 936 dp->d_unit); 937 devctl_notify("GEOM", "disk", attr, devnamebuf); 938 } 939 940 void 941 disk_media_changed(struct disk *dp, int flag) 942 { 943 struct g_geom *gp; 944 struct g_provider *pp; 945 946 gp = dp->d_geom; 947 if (gp != NULL) { 948 pp = LIST_FIRST(&gp->provider); 949 if (pp != NULL) { 950 KASSERT(LIST_NEXT(pp, provider) == NULL, 951 ("geom %p has more than one provider", gp)); 952 g_media_changed(pp, flag); 953 } 954 } 955 } 956 957 void 958 disk_media_gone(struct disk *dp, int flag) 959 { 960 struct g_geom *gp; 961 struct g_provider *pp; 962 963 gp = dp->d_geom; 964 if (gp != NULL) { 965 pp = LIST_FIRST(&gp->provider); 966 if (pp != NULL) { 967 KASSERT(LIST_NEXT(pp, provider) == NULL, 968 ("geom %p has more than one provider", gp)); 969 g_media_gone(pp, flag); 970 } 971 } 972 } 973 974 int 975 disk_resize(struct disk *dp, int flag) 976 { 977 978 if (dp->d_destroyed || dp->d_geom == NULL) 979 return (0); 980 981 return (g_post_event(g_disk_resize, dp, flag, NULL)); 982 } 983 984 static void 985 g_kern_disks(void *p, int flag __unused) 986 { 987 struct sbuf *sb; 988 struct g_geom *gp; 989 char *sp; 990 991 sb = p; 992 sp = ""; 993 g_topology_assert(); 994 LIST_FOREACH(gp, &g_disk_class.geom, geom) { 995 sbuf_printf(sb, "%s%s", sp, gp->name); 996 sp = " "; 997 } 998 sbuf_finish(sb); 999 } 1000 1001 static int 1002 sysctl_disks(SYSCTL_HANDLER_ARGS) 1003 { 1004 int error; 1005 struct sbuf *sb; 1006 1007 sb = sbuf_new_auto(); 1008 g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL); 1009 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 1010 sbuf_delete(sb); 1011 return error; 1012 } 1013 1014 SYSCTL_PROC(_kern, OID_AUTO, disks, 1015 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 1016 sysctl_disks, "A", "names of available disks");
Cache object: 6e2479e559d3fe553dc45597469b2d0f
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