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 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2002 Poul-Henning Kamp 5 * Copyright (c) 2002 Networks Associates Technology, Inc. 6 * All rights reserved. 7 * 8 * This software was developed for the FreeBSD Project by Poul-Henning Kamp 9 * and NAI Labs, the Security Research Division of Network Associates, Inc. 10 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 11 * DARPA CHATS research program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. The names of the authors may not be used to endorse or promote 22 * products derived from this software without specific prior written 23 * permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD: releng/12.0/sys/geom/geom_disk.c 327996 2018-01-15 11:20:00Z avg $"); 40 41 #include "opt_geom.h" 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/kernel.h> 46 #include <sys/sysctl.h> 47 #include <sys/bio.h> 48 #include <sys/bus.h> 49 #include <sys/ctype.h> 50 #include <sys/fcntl.h> 51 #include <sys/malloc.h> 52 #include <sys/sbuf.h> 53 #include <sys/devicestat.h> 54 #include <machine/md_var.h> 55 56 #include <sys/lock.h> 57 #include <sys/mutex.h> 58 #include <geom/geom.h> 59 #include <geom/geom_disk.h> 60 #include <geom/geom_int.h> 61 62 #include <dev/led/led.h> 63 64 #include <machine/bus.h> 65 66 struct g_disk_softc { 67 struct mtx done_mtx; 68 struct disk *dp; 69 struct sysctl_ctx_list sysctl_ctx; 70 struct sysctl_oid *sysctl_tree; 71 char led[64]; 72 uint32_t state; 73 struct mtx start_mtx; 74 }; 75 76 static g_access_t g_disk_access; 77 static g_start_t g_disk_start; 78 static g_ioctl_t g_disk_ioctl; 79 static g_dumpconf_t g_disk_dumpconf; 80 static g_provgone_t g_disk_providergone; 81 82 static int g_disk_sysctl_flags(SYSCTL_HANDLER_ARGS); 83 84 static struct g_class g_disk_class = { 85 .name = G_DISK_CLASS_NAME, 86 .version = G_VERSION, 87 .start = g_disk_start, 88 .access = g_disk_access, 89 .ioctl = g_disk_ioctl, 90 .providergone = g_disk_providergone, 91 .dumpconf = g_disk_dumpconf, 92 }; 93 94 SYSCTL_DECL(_kern_geom); 95 static SYSCTL_NODE(_kern_geom, OID_AUTO, disk, CTLFLAG_RW, 0, 96 "GEOM_DISK stuff"); 97 98 DECLARE_GEOM_CLASS(g_disk_class, g_disk); 99 100 static int 101 g_disk_access(struct g_provider *pp, int r, int w, int e) 102 { 103 struct disk *dp; 104 struct g_disk_softc *sc; 105 int error; 106 107 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 108 pp->name, r, w, e); 109 g_topology_assert(); 110 sc = pp->private; 111 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) { 112 /* 113 * Allow decreasing access count even if disk is not 114 * available anymore. 115 */ 116 if (r <= 0 && w <= 0 && e <= 0) 117 return (0); 118 return (ENXIO); 119 } 120 r += pp->acr; 121 w += pp->acw; 122 e += pp->ace; 123 error = 0; 124 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 125 /* 126 * It would be better to defer this decision to d_open if 127 * it was able to take flags. 128 */ 129 if (w > 0 && (dp->d_flags & DISKFLAG_WRITE_PROTECT) != 0) 130 error = EROFS; 131 if (error == 0 && dp->d_open != NULL) 132 error = dp->d_open(dp); 133 if (bootverbose && error != 0) 134 printf("Opened disk %s -> %d\n", pp->name, error); 135 if (error != 0) 136 return (error); 137 pp->sectorsize = dp->d_sectorsize; 138 if (dp->d_maxsize == 0) { 139 printf("WARNING: Disk drive %s%d has no d_maxsize\n", 140 dp->d_name, dp->d_unit); 141 dp->d_maxsize = DFLTPHYS; 142 } 143 if (dp->d_delmaxsize == 0) { 144 if (bootverbose && dp->d_flags & DISKFLAG_CANDELETE) { 145 printf("WARNING: Disk drive %s%d has no " 146 "d_delmaxsize\n", dp->d_name, dp->d_unit); 147 } 148 dp->d_delmaxsize = dp->d_maxsize; 149 } 150 pp->stripeoffset = dp->d_stripeoffset; 151 pp->stripesize = dp->d_stripesize; 152 dp->d_flags |= DISKFLAG_OPEN; 153 /* 154 * Do not invoke resize event when initial size was zero. 155 * Some disks report its size only after first opening. 156 */ 157 if (pp->mediasize == 0) 158 pp->mediasize = dp->d_mediasize; 159 else 160 g_resize_provider(pp, dp->d_mediasize); 161 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 162 if (dp->d_close != NULL) { 163 error = dp->d_close(dp); 164 if (error != 0) 165 printf("Closed disk %s -> %d\n", 166 pp->name, error); 167 } 168 sc->state = G_STATE_ACTIVE; 169 if (sc->led[0] != 0) 170 led_set(sc->led, ""); 171 dp->d_flags &= ~DISKFLAG_OPEN; 172 } 173 return (error); 174 } 175 176 static void 177 g_disk_kerneldump(struct bio *bp, struct disk *dp) 178 { 179 struct g_kerneldump *gkd; 180 struct g_geom *gp; 181 182 gkd = (struct g_kerneldump*)bp->bio_data; 183 gp = bp->bio_to->geom; 184 g_trace(G_T_TOPOLOGY, "g_disk_kerneldump(%s, %jd, %jd)", 185 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 186 if (dp->d_dump == NULL) { 187 g_io_deliver(bp, ENODEV); 188 return; 189 } 190 gkd->di.dumper = dp->d_dump; 191 gkd->di.priv = dp; 192 gkd->di.blocksize = dp->d_sectorsize; 193 gkd->di.maxiosize = dp->d_maxsize; 194 gkd->di.mediaoffset = gkd->offset; 195 if ((gkd->offset + gkd->length) > dp->d_mediasize) 196 gkd->length = dp->d_mediasize - gkd->offset; 197 gkd->di.mediasize = gkd->length; 198 g_io_deliver(bp, 0); 199 } 200 201 static void 202 g_disk_setstate(struct bio *bp, struct g_disk_softc *sc) 203 { 204 const char *cmd; 205 206 memcpy(&sc->state, bp->bio_data, sizeof(sc->state)); 207 if (sc->led[0] != 0) { 208 switch (sc->state) { 209 case G_STATE_FAILED: 210 cmd = "1"; 211 break; 212 case G_STATE_REBUILD: 213 cmd = "f5"; 214 break; 215 case G_STATE_RESYNC: 216 cmd = "f1"; 217 break; 218 default: 219 cmd = ""; 220 break; 221 } 222 led_set(sc->led, cmd); 223 } 224 g_io_deliver(bp, 0); 225 } 226 227 static void 228 g_disk_done(struct bio *bp) 229 { 230 struct bintime now; 231 struct bio *bp2; 232 struct g_disk_softc *sc; 233 234 /* See "notes" for why we need a mutex here */ 235 /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */ 236 bp2 = bp->bio_parent; 237 sc = bp2->bio_to->private; 238 bp->bio_completed = bp->bio_length - bp->bio_resid; 239 binuptime(&now); 240 mtx_lock(&sc->done_mtx); 241 if (bp2->bio_error == 0) 242 bp2->bio_error = bp->bio_error; 243 bp2->bio_completed += bp->bio_completed; 244 245 switch (bp->bio_cmd) { 246 case BIO_ZONE: 247 bcopy(&bp->bio_zone, &bp2->bio_zone, sizeof(bp->bio_zone)); 248 /*FALLTHROUGH*/ 249 case BIO_READ: 250 case BIO_WRITE: 251 case BIO_DELETE: 252 case BIO_FLUSH: 253 devstat_end_transaction_bio_bt(sc->dp->d_devstat, bp, &now); 254 break; 255 default: 256 break; 257 } 258 bp2->bio_inbed++; 259 if (bp2->bio_children == bp2->bio_inbed) { 260 mtx_unlock(&sc->done_mtx); 261 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed; 262 g_io_deliver(bp2, bp2->bio_error); 263 } else 264 mtx_unlock(&sc->done_mtx); 265 g_destroy_bio(bp); 266 } 267 268 static int 269 g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td) 270 { 271 struct disk *dp; 272 struct g_disk_softc *sc; 273 int error; 274 275 sc = pp->private; 276 dp = sc->dp; 277 278 if (dp->d_ioctl == NULL) 279 return (ENOIOCTL); 280 error = dp->d_ioctl(dp, cmd, data, fflag, td); 281 return (error); 282 } 283 284 static off_t 285 g_disk_maxsize(struct disk *dp, struct bio *bp) 286 { 287 if (bp->bio_cmd == BIO_DELETE) 288 return (dp->d_delmaxsize); 289 return (dp->d_maxsize); 290 } 291 292 static int 293 g_disk_maxsegs(struct disk *dp, struct bio *bp) 294 { 295 return ((g_disk_maxsize(dp, bp) / PAGE_SIZE) + 1); 296 } 297 298 static void 299 g_disk_advance(struct disk *dp, struct bio *bp, off_t off) 300 { 301 302 bp->bio_offset += off; 303 bp->bio_length -= off; 304 305 if ((bp->bio_flags & BIO_VLIST) != 0) { 306 bus_dma_segment_t *seg, *end; 307 308 seg = (bus_dma_segment_t *)bp->bio_data; 309 end = (bus_dma_segment_t *)bp->bio_data + bp->bio_ma_n; 310 off += bp->bio_ma_offset; 311 while (off >= seg->ds_len) { 312 KASSERT((seg != end), 313 ("vlist request runs off the end")); 314 off -= seg->ds_len; 315 seg++; 316 } 317 bp->bio_ma_offset = off; 318 bp->bio_ma_n = end - seg; 319 bp->bio_data = (void *)seg; 320 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 321 bp->bio_ma += off / PAGE_SIZE; 322 bp->bio_ma_offset += off; 323 bp->bio_ma_offset %= PAGE_SIZE; 324 bp->bio_ma_n -= off / PAGE_SIZE; 325 } else { 326 bp->bio_data += off; 327 } 328 } 329 330 static void 331 g_disk_seg_limit(bus_dma_segment_t *seg, off_t *poffset, 332 off_t *plength, int *ppages) 333 { 334 uintptr_t seg_page_base; 335 uintptr_t seg_page_end; 336 off_t offset; 337 off_t length; 338 int seg_pages; 339 340 offset = *poffset; 341 length = *plength; 342 343 if (length > seg->ds_len - offset) 344 length = seg->ds_len - offset; 345 346 seg_page_base = trunc_page(seg->ds_addr + offset); 347 seg_page_end = round_page(seg->ds_addr + offset + length); 348 seg_pages = (seg_page_end - seg_page_base) >> PAGE_SHIFT; 349 350 if (seg_pages > *ppages) { 351 seg_pages = *ppages; 352 length = (seg_page_base + (seg_pages << PAGE_SHIFT)) - 353 (seg->ds_addr + offset); 354 } 355 356 *poffset = 0; 357 *plength -= length; 358 *ppages -= seg_pages; 359 } 360 361 static off_t 362 g_disk_vlist_limit(struct disk *dp, struct bio *bp, bus_dma_segment_t **pendseg) 363 { 364 bus_dma_segment_t *seg, *end; 365 off_t residual; 366 off_t offset; 367 int pages; 368 369 seg = (bus_dma_segment_t *)bp->bio_data; 370 end = (bus_dma_segment_t *)bp->bio_data + bp->bio_ma_n; 371 residual = bp->bio_length; 372 offset = bp->bio_ma_offset; 373 pages = g_disk_maxsegs(dp, bp); 374 while (residual != 0 && pages != 0) { 375 KASSERT((seg != end), 376 ("vlist limit runs off the end")); 377 g_disk_seg_limit(seg, &offset, &residual, &pages); 378 seg++; 379 } 380 if (pendseg != NULL) 381 *pendseg = seg; 382 return (residual); 383 } 384 385 static bool 386 g_disk_limit(struct disk *dp, struct bio *bp) 387 { 388 bool limited = false; 389 off_t maxsz; 390 391 maxsz = g_disk_maxsize(dp, bp); 392 393 /* 394 * XXX: If we have a stripesize we should really use it here. 395 * Care should be taken in the delete case if this is done 396 * as deletes can be very sensitive to size given how they 397 * are processed. 398 */ 399 if (bp->bio_length > maxsz) { 400 bp->bio_length = maxsz; 401 limited = true; 402 } 403 404 if ((bp->bio_flags & BIO_VLIST) != 0) { 405 bus_dma_segment_t *firstseg, *endseg; 406 off_t residual; 407 408 firstseg = (bus_dma_segment_t*)bp->bio_data; 409 residual = g_disk_vlist_limit(dp, bp, &endseg); 410 if (residual != 0) { 411 bp->bio_ma_n = endseg - firstseg; 412 bp->bio_length -= residual; 413 limited = true; 414 } 415 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 416 bp->bio_ma_n = 417 howmany(bp->bio_ma_offset + bp->bio_length, PAGE_SIZE); 418 } 419 420 return (limited); 421 } 422 423 static void 424 g_disk_start(struct bio *bp) 425 { 426 struct bio *bp2, *bp3; 427 struct disk *dp; 428 struct g_disk_softc *sc; 429 int error; 430 off_t off; 431 432 biotrack(bp, __func__); 433 434 sc = bp->bio_to->private; 435 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) { 436 g_io_deliver(bp, ENXIO); 437 return; 438 } 439 error = EJUSTRETURN; 440 switch(bp->bio_cmd) { 441 case BIO_DELETE: 442 if (!(dp->d_flags & DISKFLAG_CANDELETE)) { 443 error = EOPNOTSUPP; 444 break; 445 } 446 /* fall-through */ 447 case BIO_READ: 448 case BIO_WRITE: 449 KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0 || 450 (bp->bio_flags & BIO_UNMAPPED) == 0, 451 ("unmapped bio not supported by disk %s", dp->d_name)); 452 off = 0; 453 bp3 = NULL; 454 bp2 = g_clone_bio(bp); 455 if (bp2 == NULL) { 456 error = ENOMEM; 457 break; 458 } 459 for (;;) { 460 if (g_disk_limit(dp, bp2)) { 461 off += bp2->bio_length; 462 463 /* 464 * To avoid a race, we need to grab the next bio 465 * before we schedule this one. See "notes". 466 */ 467 bp3 = g_clone_bio(bp); 468 if (bp3 == NULL) 469 bp->bio_error = ENOMEM; 470 } 471 bp2->bio_done = g_disk_done; 472 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 473 bp2->bio_bcount = bp2->bio_length; 474 bp2->bio_disk = dp; 475 mtx_lock(&sc->start_mtx); 476 devstat_start_transaction_bio(dp->d_devstat, bp2); 477 mtx_unlock(&sc->start_mtx); 478 dp->d_strategy(bp2); 479 480 if (bp3 == NULL) 481 break; 482 483 bp2 = bp3; 484 bp3 = NULL; 485 g_disk_advance(dp, bp2, off); 486 } 487 break; 488 case BIO_GETATTR: 489 /* Give the driver a chance to override */ 490 if (dp->d_getattr != NULL) { 491 if (bp->bio_disk == NULL) 492 bp->bio_disk = dp; 493 error = dp->d_getattr(bp); 494 if (error != -1) 495 break; 496 error = EJUSTRETURN; 497 } 498 if (g_handleattr_int(bp, "GEOM::candelete", 499 (dp->d_flags & DISKFLAG_CANDELETE) != 0)) 500 break; 501 else if (g_handleattr_int(bp, "GEOM::fwsectors", 502 dp->d_fwsectors)) 503 break; 504 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 505 break; 506 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 507 break; 508 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident)) 509 break; 510 else if (g_handleattr_str(bp, "GEOM::descr", dp->d_descr)) 511 break; 512 else if (g_handleattr_uint16_t(bp, "GEOM::hba_vendor", 513 dp->d_hba_vendor)) 514 break; 515 else if (g_handleattr_uint16_t(bp, "GEOM::hba_device", 516 dp->d_hba_device)) 517 break; 518 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subvendor", 519 dp->d_hba_subvendor)) 520 break; 521 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subdevice", 522 dp->d_hba_subdevice)) 523 break; 524 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 525 g_disk_kerneldump(bp, dp); 526 else if (!strcmp(bp->bio_attribute, "GEOM::setstate")) 527 g_disk_setstate(bp, sc); 528 else if (g_handleattr_uint16_t(bp, "GEOM::rotation_rate", 529 dp->d_rotation_rate)) 530 break; 531 else 532 error = ENOIOCTL; 533 break; 534 case BIO_FLUSH: 535 g_trace(G_T_BIO, "g_disk_flushcache(%s)", 536 bp->bio_to->name); 537 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) { 538 error = EOPNOTSUPP; 539 break; 540 } 541 /*FALLTHROUGH*/ 542 case BIO_ZONE: 543 if (bp->bio_cmd == BIO_ZONE) { 544 if (!(dp->d_flags & DISKFLAG_CANZONE)) { 545 error = EOPNOTSUPP; 546 break; 547 } 548 g_trace(G_T_BIO, "g_disk_zone(%s)", 549 bp->bio_to->name); 550 } 551 bp2 = g_clone_bio(bp); 552 if (bp2 == NULL) { 553 g_io_deliver(bp, ENOMEM); 554 return; 555 } 556 bp2->bio_done = g_disk_done; 557 bp2->bio_disk = dp; 558 mtx_lock(&sc->start_mtx); 559 devstat_start_transaction_bio(dp->d_devstat, bp2); 560 mtx_unlock(&sc->start_mtx); 561 dp->d_strategy(bp2); 562 break; 563 default: 564 error = EOPNOTSUPP; 565 break; 566 } 567 if (error != EJUSTRETURN) 568 g_io_deliver(bp, error); 569 return; 570 } 571 572 static void 573 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 574 { 575 struct bio *bp; 576 struct disk *dp; 577 struct g_disk_softc *sc; 578 char *buf; 579 int res = 0; 580 581 sc = gp->softc; 582 if (sc == NULL || (dp = sc->dp) == NULL) 583 return; 584 if (indent == NULL) { 585 sbuf_printf(sb, " hd %u", dp->d_fwheads); 586 sbuf_printf(sb, " sc %u", dp->d_fwsectors); 587 return; 588 } 589 if (pp != NULL) { 590 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", 591 indent, dp->d_fwheads); 592 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", 593 indent, dp->d_fwsectors); 594 595 /* 596 * "rotationrate" is a little complicated, because the value 597 * returned by the drive might not be the RPM; 0 and 1 are 598 * special cases, and there's also a valid range. 599 */ 600 sbuf_printf(sb, "%s<rotationrate>", indent); 601 if (dp->d_rotation_rate == DISK_RR_UNKNOWN) /* Old drives */ 602 sbuf_printf(sb, "unknown"); /* don't report RPM. */ 603 else if (dp->d_rotation_rate == DISK_RR_NON_ROTATING) 604 sbuf_printf(sb, ""); 605 else if ((dp->d_rotation_rate >= DISK_RR_MIN) && 606 (dp->d_rotation_rate <= DISK_RR_MAX)) 607 sbuf_printf(sb, "%u", dp->d_rotation_rate); 608 else 609 sbuf_printf(sb, "invalid"); 610 sbuf_printf(sb, "</rotationrate>\n"); 611 if (dp->d_getattr != NULL) { 612 buf = g_malloc(DISK_IDENT_SIZE, M_WAITOK); 613 bp = g_alloc_bio(); 614 bp->bio_disk = dp; 615 bp->bio_attribute = "GEOM::ident"; 616 bp->bio_length = DISK_IDENT_SIZE; 617 bp->bio_data = buf; 618 res = dp->d_getattr(bp); 619 sbuf_printf(sb, "%s<ident>", indent); 620 g_conf_printf_escaped(sb, "%s", 621 res == 0 ? buf: dp->d_ident); 622 sbuf_printf(sb, "</ident>\n"); 623 bp->bio_attribute = "GEOM::lunid"; 624 bp->bio_length = DISK_IDENT_SIZE; 625 bp->bio_data = buf; 626 if (dp->d_getattr(bp) == 0) { 627 sbuf_printf(sb, "%s<lunid>", indent); 628 g_conf_printf_escaped(sb, "%s", buf); 629 sbuf_printf(sb, "</lunid>\n"); 630 } 631 bp->bio_attribute = "GEOM::lunname"; 632 bp->bio_length = DISK_IDENT_SIZE; 633 bp->bio_data = buf; 634 if (dp->d_getattr(bp) == 0) { 635 sbuf_printf(sb, "%s<lunname>", indent); 636 g_conf_printf_escaped(sb, "%s", buf); 637 sbuf_printf(sb, "</lunname>\n"); 638 } 639 g_destroy_bio(bp); 640 g_free(buf); 641 } else { 642 sbuf_printf(sb, "%s<ident>", indent); 643 g_conf_printf_escaped(sb, "%s", dp->d_ident); 644 sbuf_printf(sb, "</ident>\n"); 645 } 646 sbuf_printf(sb, "%s<descr>", indent); 647 g_conf_printf_escaped(sb, "%s", dp->d_descr); 648 sbuf_printf(sb, "</descr>\n"); 649 } 650 } 651 652 static void 653 g_disk_resize(void *ptr, int flag) 654 { 655 struct disk *dp; 656 struct g_geom *gp; 657 struct g_provider *pp; 658 659 if (flag == EV_CANCEL) 660 return; 661 g_topology_assert(); 662 663 dp = ptr; 664 gp = dp->d_geom; 665 666 if (dp->d_destroyed || gp == NULL) 667 return; 668 669 LIST_FOREACH(pp, &gp->provider, provider) { 670 if (pp->sectorsize != 0 && 671 pp->sectorsize != dp->d_sectorsize) 672 g_wither_provider(pp, ENXIO); 673 else 674 g_resize_provider(pp, dp->d_mediasize); 675 } 676 } 677 678 static void 679 g_disk_create(void *arg, int flag) 680 { 681 struct g_geom *gp; 682 struct g_provider *pp; 683 struct disk *dp; 684 struct g_disk_softc *sc; 685 struct disk_alias *dap; 686 char tmpstr[80]; 687 688 if (flag == EV_CANCEL) 689 return; 690 g_topology_assert(); 691 dp = arg; 692 693 mtx_pool_lock(mtxpool_sleep, dp); 694 dp->d_init_level = DISK_INIT_START; 695 696 /* 697 * If the disk has already gone away, we can just stop here and 698 * call the user's callback to tell him we've cleaned things up. 699 */ 700 if (dp->d_goneflag != 0) { 701 mtx_pool_unlock(mtxpool_sleep, dp); 702 if (dp->d_gone != NULL) 703 dp->d_gone(dp); 704 return; 705 } 706 mtx_pool_unlock(mtxpool_sleep, dp); 707 708 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 709 mtx_init(&sc->start_mtx, "g_disk_start", NULL, MTX_DEF); 710 mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF); 711 sc->dp = dp; 712 gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit); 713 gp->softc = sc; 714 LIST_FOREACH(dap, &dp->d_aliases, da_next) { 715 snprintf(tmpstr, sizeof(tmpstr), "%s%d", dap->da_alias, dp->d_unit); 716 g_geom_add_alias(gp, tmpstr); 717 } 718 pp = g_new_providerf(gp, "%s", gp->name); 719 devstat_remove_entry(pp->stat); 720 pp->stat = NULL; 721 dp->d_devstat->id = pp; 722 pp->mediasize = dp->d_mediasize; 723 pp->sectorsize = dp->d_sectorsize; 724 pp->stripeoffset = dp->d_stripeoffset; 725 pp->stripesize = dp->d_stripesize; 726 if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0) 727 pp->flags |= G_PF_ACCEPT_UNMAPPED; 728 if ((dp->d_flags & DISKFLAG_DIRECT_COMPLETION) != 0) 729 pp->flags |= G_PF_DIRECT_SEND; 730 pp->flags |= G_PF_DIRECT_RECEIVE; 731 if (bootverbose) 732 printf("GEOM: new disk %s\n", gp->name); 733 sysctl_ctx_init(&sc->sysctl_ctx); 734 snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name); 735 sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx, 736 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name, 737 CTLFLAG_RD, 0, tmpstr); 738 if (sc->sysctl_tree != NULL) { 739 SYSCTL_ADD_STRING(&sc->sysctl_ctx, 740 SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led", 741 CTLFLAG_RWTUN, sc->led, sizeof(sc->led), 742 "LED name"); 743 SYSCTL_ADD_PROC(&sc->sysctl_ctx, 744 SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "flags", 745 CTLTYPE_STRING | CTLFLAG_RD, dp, 0, g_disk_sysctl_flags, 746 "A", "Report disk flags"); 747 } 748 pp->private = sc; 749 dp->d_geom = gp; 750 g_error_provider(pp, 0); 751 752 mtx_pool_lock(mtxpool_sleep, dp); 753 dp->d_init_level = DISK_INIT_DONE; 754 755 /* 756 * If the disk has gone away at this stage, start the withering 757 * process for it. 758 */ 759 if (dp->d_goneflag != 0) { 760 mtx_pool_unlock(mtxpool_sleep, dp); 761 g_wither_provider(pp, ENXIO); 762 return; 763 } 764 mtx_pool_unlock(mtxpool_sleep, dp); 765 766 } 767 768 /* 769 * We get this callback after all of the consumers have gone away, and just 770 * before the provider is freed. If the disk driver provided a d_gone 771 * callback, let them know that it is okay to free resources -- they won't 772 * be getting any more accesses from GEOM. 773 */ 774 static void 775 g_disk_providergone(struct g_provider *pp) 776 { 777 struct disk *dp; 778 struct g_disk_softc *sc; 779 780 sc = (struct g_disk_softc *)pp->private; 781 dp = sc->dp; 782 if (dp != NULL && dp->d_gone != NULL) 783 dp->d_gone(dp); 784 if (sc->sysctl_tree != NULL) { 785 sysctl_ctx_free(&sc->sysctl_ctx); 786 sc->sysctl_tree = NULL; 787 } 788 if (sc->led[0] != 0) { 789 led_set(sc->led, ""); 790 sc->led[0] = 0; 791 } 792 pp->private = NULL; 793 pp->geom->softc = NULL; 794 mtx_destroy(&sc->done_mtx); 795 mtx_destroy(&sc->start_mtx); 796 g_free(sc); 797 } 798 799 static void 800 g_disk_destroy(void *ptr, int flag) 801 { 802 struct disk *dp; 803 struct g_geom *gp; 804 struct g_disk_softc *sc; 805 struct disk_alias *dap, *daptmp; 806 807 g_topology_assert(); 808 dp = ptr; 809 gp = dp->d_geom; 810 if (gp != NULL) { 811 sc = gp->softc; 812 if (sc != NULL) 813 sc->dp = NULL; 814 dp->d_geom = NULL; 815 g_wither_geom(gp, ENXIO); 816 } 817 LIST_FOREACH_SAFE(dap, &dp->d_aliases, da_next, daptmp) 818 g_free(dap); 819 820 g_free(dp); 821 } 822 823 /* 824 * We only allow printable characters in disk ident, 825 * the rest is converted to 'x<HH>'. 826 */ 827 static void 828 g_disk_ident_adjust(char *ident, size_t size) 829 { 830 char *p, tmp[4], newid[DISK_IDENT_SIZE]; 831 832 newid[0] = '\0'; 833 for (p = ident; *p != '\0'; p++) { 834 if (isprint(*p)) { 835 tmp[0] = *p; 836 tmp[1] = '\0'; 837 } else { 838 snprintf(tmp, sizeof(tmp), "x%02hhx", 839 *(unsigned char *)p); 840 } 841 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid)) 842 break; 843 } 844 bzero(ident, size); 845 strlcpy(ident, newid, size); 846 } 847 848 struct disk * 849 disk_alloc(void) 850 { 851 struct disk *dp; 852 853 dp = g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO); 854 LIST_INIT(&dp->d_aliases); 855 return (dp); 856 } 857 858 void 859 disk_create(struct disk *dp, int version) 860 { 861 862 if (version != DISK_VERSION) { 863 printf("WARNING: Attempt to add disk %s%d %s", 864 dp->d_name, dp->d_unit, 865 " using incompatible ABI version of disk(9)\n"); 866 printf("WARNING: Ignoring disk %s%d\n", 867 dp->d_name, dp->d_unit); 868 return; 869 } 870 if (dp->d_flags & DISKFLAG_RESERVED) { 871 printf("WARNING: Attempt to add non-MPSAFE disk %s%d\n", 872 dp->d_name, dp->d_unit); 873 printf("WARNING: Ignoring disk %s%d\n", 874 dp->d_name, dp->d_unit); 875 return; 876 } 877 KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy")); 878 KASSERT(dp->d_name != NULL, ("disk_create need d_name")); 879 KASSERT(*dp->d_name != 0, ("disk_create need d_name")); 880 KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long")); 881 if (dp->d_devstat == NULL) 882 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit, 883 dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED, 884 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 885 dp->d_geom = NULL; 886 887 dp->d_init_level = DISK_INIT_NONE; 888 889 g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident)); 890 g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL); 891 } 892 893 void 894 disk_destroy(struct disk *dp) 895 { 896 897 g_cancel_event(dp); 898 dp->d_destroyed = 1; 899 if (dp->d_devstat != NULL) 900 devstat_remove_entry(dp->d_devstat); 901 g_post_event(g_disk_destroy, dp, M_WAITOK, NULL); 902 } 903 904 void 905 disk_add_alias(struct disk *dp, const char *name) 906 { 907 struct disk_alias *dap; 908 909 dap = (struct disk_alias *)g_malloc( 910 sizeof(struct disk_alias) + strlen(name) + 1, M_WAITOK); 911 strcpy((char *)(dap + 1), name); 912 dap->da_alias = (const char *)(dap + 1); 913 LIST_INSERT_HEAD(&dp->d_aliases, dap, da_next); 914 } 915 916 void 917 disk_gone(struct disk *dp) 918 { 919 struct g_geom *gp; 920 struct g_provider *pp; 921 922 mtx_pool_lock(mtxpool_sleep, dp); 923 dp->d_goneflag = 1; 924 925 /* 926 * If we're still in the process of creating this disk (the 927 * g_disk_create() function is still queued, or is in 928 * progress), the init level will not yet be DISK_INIT_DONE. 929 * 930 * If that is the case, g_disk_create() will see d_goneflag 931 * and take care of cleaning things up. 932 * 933 * If the disk has already been created, we default to 934 * withering the provider as usual below. 935 * 936 * If the caller has not set a d_gone() callback, he will 937 * not be any worse off by returning here, because the geom 938 * has not been fully setup in any case. 939 */ 940 if (dp->d_init_level < DISK_INIT_DONE) { 941 mtx_pool_unlock(mtxpool_sleep, dp); 942 return; 943 } 944 mtx_pool_unlock(mtxpool_sleep, dp); 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_wither_provider(pp, ENXIO); 953 } 954 } 955 } 956 957 void 958 disk_attr_changed(struct disk *dp, const char *attr, int flag) 959 { 960 struct g_geom *gp; 961 struct g_provider *pp; 962 char devnamebuf[128]; 963 964 gp = dp->d_geom; 965 if (gp != NULL) 966 LIST_FOREACH(pp, &gp->provider, provider) 967 (void)g_attr_changed(pp, attr, flag); 968 snprintf(devnamebuf, sizeof(devnamebuf), "devname=%s%d", dp->d_name, 969 dp->d_unit); 970 devctl_notify("GEOM", "disk", attr, devnamebuf); 971 } 972 973 void 974 disk_media_changed(struct disk *dp, int flag) 975 { 976 struct g_geom *gp; 977 struct g_provider *pp; 978 979 gp = dp->d_geom; 980 if (gp != NULL) { 981 pp = LIST_FIRST(&gp->provider); 982 if (pp != NULL) { 983 KASSERT(LIST_NEXT(pp, provider) == NULL, 984 ("geom %p has more than one provider", gp)); 985 g_media_changed(pp, flag); 986 } 987 } 988 } 989 990 void 991 disk_media_gone(struct disk *dp, int flag) 992 { 993 struct g_geom *gp; 994 struct g_provider *pp; 995 996 gp = dp->d_geom; 997 if (gp != NULL) { 998 pp = LIST_FIRST(&gp->provider); 999 if (pp != NULL) { 1000 KASSERT(LIST_NEXT(pp, provider) == NULL, 1001 ("geom %p has more than one provider", gp)); 1002 g_media_gone(pp, flag); 1003 } 1004 } 1005 } 1006 1007 int 1008 disk_resize(struct disk *dp, int flag) 1009 { 1010 1011 if (dp->d_destroyed || dp->d_geom == NULL) 1012 return (0); 1013 1014 return (g_post_event(g_disk_resize, dp, flag, NULL)); 1015 } 1016 1017 static void 1018 g_kern_disks(void *p, int flag __unused) 1019 { 1020 struct sbuf *sb; 1021 struct g_geom *gp; 1022 char *sp; 1023 1024 sb = p; 1025 sp = ""; 1026 g_topology_assert(); 1027 LIST_FOREACH(gp, &g_disk_class.geom, geom) { 1028 sbuf_printf(sb, "%s%s", sp, gp->name); 1029 sp = " "; 1030 } 1031 sbuf_finish(sb); 1032 } 1033 1034 static int 1035 g_disk_sysctl_flags(SYSCTL_HANDLER_ARGS) 1036 { 1037 struct disk *dp; 1038 struct sbuf *sb; 1039 int error; 1040 1041 sb = sbuf_new_auto(); 1042 dp = (struct disk *)arg1; 1043 sbuf_printf(sb, "%b", dp->d_flags, 1044 "\2" 1045 "\2OPEN" 1046 "\3CANDELETE" 1047 "\4CANFLUSHCACHE" 1048 "\5UNMAPPEDBIO" 1049 "\6DIRECTCOMPLETION" 1050 "\10CANZONE" 1051 "\11WRITEPROTECT"); 1052 1053 sbuf_finish(sb); 1054 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 1055 sbuf_delete(sb); 1056 return (error); 1057 } 1058 1059 static int 1060 sysctl_disks(SYSCTL_HANDLER_ARGS) 1061 { 1062 int error; 1063 struct sbuf *sb; 1064 1065 sb = sbuf_new_auto(); 1066 g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL); 1067 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 1068 sbuf_delete(sb); 1069 return error; 1070 } 1071 1072 SYSCTL_PROC(_kern, OID_AUTO, disks, 1073 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 1074 sysctl_disks, "A", "names of available disks");
Cache object: 187251f6ef4fc52ee2c8dc94cf4aa72b
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