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/10.4/sys/geom/geom_disk.c 321291 2017-07-20 11:37:02Z 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 void __inline 97 g_disk_lock_giant(struct disk *dp) 98 { 99 100 if (dp->d_flags & DISKFLAG_NEEDSGIANT) 101 mtx_lock(&Giant); 102 } 103 104 static void __inline 105 g_disk_unlock_giant(struct disk *dp) 106 { 107 108 if (dp->d_flags & DISKFLAG_NEEDSGIANT) 109 mtx_unlock(&Giant); 110 } 111 112 static int 113 g_disk_access(struct g_provider *pp, int r, int w, int e) 114 { 115 struct disk *dp; 116 struct g_disk_softc *sc; 117 int error; 118 119 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 120 pp->name, r, w, e); 121 g_topology_assert(); 122 sc = pp->private; 123 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) { 124 /* 125 * Allow decreasing access count even if disk is not 126 * avaliable anymore. 127 */ 128 if (r <= 0 && w <= 0 && e <= 0) 129 return (0); 130 return (ENXIO); 131 } 132 r += pp->acr; 133 w += pp->acw; 134 e += pp->ace; 135 error = 0; 136 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 137 if (dp->d_open != NULL) { 138 g_disk_lock_giant(dp); 139 error = dp->d_open(dp); 140 if (bootverbose && error != 0) 141 printf("Opened disk %s -> %d\n", 142 pp->name, error); 143 g_disk_unlock_giant(dp); 144 if (error != 0) 145 return (error); 146 } 147 pp->mediasize = dp->d_mediasize; 148 pp->sectorsize = dp->d_sectorsize; 149 if (dp->d_maxsize == 0) { 150 printf("WARNING: Disk drive %s%d has no d_maxsize\n", 151 dp->d_name, dp->d_unit); 152 dp->d_maxsize = DFLTPHYS; 153 } 154 if (dp->d_delmaxsize == 0) { 155 if (bootverbose && dp->d_flags & DISKFLAG_CANDELETE) { 156 printf("WARNING: Disk drive %s%d has no " 157 "d_delmaxsize\n", dp->d_name, dp->d_unit); 158 } 159 dp->d_delmaxsize = dp->d_maxsize; 160 } 161 pp->stripeoffset = dp->d_stripeoffset; 162 pp->stripesize = dp->d_stripesize; 163 dp->d_flags |= DISKFLAG_OPEN; 164 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 165 if (dp->d_close != NULL) { 166 g_disk_lock_giant(dp); 167 error = dp->d_close(dp); 168 if (error != 0) 169 printf("Closed disk %s -> %d\n", 170 pp->name, error); 171 g_disk_unlock_giant(dp); 172 } 173 sc->state = G_STATE_ACTIVE; 174 if (sc->led[0] != 0) 175 led_set(sc->led, ""); 176 dp->d_flags &= ~DISKFLAG_OPEN; 177 } 178 return (error); 179 } 180 181 static void 182 g_disk_kerneldump(struct bio *bp, struct disk *dp) 183 { 184 struct g_kerneldump *gkd; 185 struct g_geom *gp; 186 187 gkd = (struct g_kerneldump*)bp->bio_data; 188 gp = bp->bio_to->geom; 189 g_trace(G_T_TOPOLOGY, "g_disk_kerneldump(%s, %jd, %jd)", 190 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 191 if (dp->d_dump == NULL) { 192 g_io_deliver(bp, ENODEV); 193 return; 194 } 195 gkd->di.dumper = dp->d_dump; 196 gkd->di.priv = dp; 197 gkd->di.blocksize = dp->d_sectorsize; 198 gkd->di.maxiosize = dp->d_maxsize; 199 gkd->di.mediaoffset = gkd->offset; 200 if ((gkd->offset + gkd->length) > dp->d_mediasize) 201 gkd->length = dp->d_mediasize - gkd->offset; 202 gkd->di.mediasize = gkd->length; 203 g_io_deliver(bp, 0); 204 } 205 206 static void 207 g_disk_setstate(struct bio *bp, struct g_disk_softc *sc) 208 { 209 const char *cmd; 210 211 memcpy(&sc->state, bp->bio_data, sizeof(sc->state)); 212 if (sc->led[0] != 0) { 213 switch (sc->state) { 214 case G_STATE_FAILED: 215 cmd = "1"; 216 break; 217 case G_STATE_REBUILD: 218 cmd = "f5"; 219 break; 220 case G_STATE_RESYNC: 221 cmd = "f1"; 222 break; 223 default: 224 cmd = ""; 225 break; 226 } 227 led_set(sc->led, cmd); 228 } 229 g_io_deliver(bp, 0); 230 } 231 232 static void 233 g_disk_done(struct bio *bp) 234 { 235 struct bintime now; 236 struct bio *bp2; 237 struct g_disk_softc *sc; 238 239 /* See "notes" for why we need a mutex here */ 240 /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */ 241 bp2 = bp->bio_parent; 242 sc = bp2->bio_to->private; 243 bp->bio_completed = bp->bio_length - bp->bio_resid; 244 binuptime(&now); 245 mtx_lock(&sc->done_mtx); 246 if (bp2->bio_error == 0) 247 bp2->bio_error = bp->bio_error; 248 bp2->bio_completed += bp->bio_completed; 249 if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE|BIO_FLUSH)) != 0) 250 devstat_end_transaction_bio_bt(sc->dp->d_devstat, bp, &now); 251 bp2->bio_inbed++; 252 if (bp2->bio_children == bp2->bio_inbed) { 253 mtx_unlock(&sc->done_mtx); 254 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed; 255 g_io_deliver(bp2, bp2->bio_error); 256 } else 257 mtx_unlock(&sc->done_mtx); 258 g_destroy_bio(bp); 259 } 260 261 static int 262 g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td) 263 { 264 struct disk *dp; 265 struct g_disk_softc *sc; 266 int error; 267 268 sc = pp->private; 269 dp = sc->dp; 270 271 if (dp->d_ioctl == NULL) 272 return (ENOIOCTL); 273 g_disk_lock_giant(dp); 274 error = dp->d_ioctl(dp, cmd, data, fflag, td); 275 g_disk_unlock_giant(dp); 276 return (error); 277 } 278 279 static off_t 280 g_disk_maxsize(struct disk *dp, struct bio *bp) 281 { 282 if (bp->bio_cmd == BIO_DELETE) 283 return (dp->d_delmaxsize); 284 return (dp->d_maxsize); 285 } 286 287 static int 288 g_disk_maxsegs(struct disk *dp, struct bio *bp) 289 { 290 return ((g_disk_maxsize(dp, bp) / PAGE_SIZE) + 1); 291 } 292 293 static void 294 g_disk_advance(struct disk *dp, struct bio *bp, off_t off) 295 { 296 297 bp->bio_offset += off; 298 bp->bio_length -= off; 299 300 if ((bp->bio_flags & BIO_VLIST) != 0) { 301 bus_dma_segment_t *seg, *end; 302 303 seg = (bus_dma_segment_t *)bp->bio_data; 304 end = (bus_dma_segment_t *)bp->bio_data + bp->bio_ma_n; 305 off += bp->bio_ma_offset; 306 while (off >= seg->ds_len) { 307 KASSERT((seg != end), 308 ("vlist request runs off the end")); 309 off -= seg->ds_len; 310 seg++; 311 } 312 bp->bio_ma_offset = off; 313 bp->bio_ma_n = end - seg; 314 bp->bio_data = (void *)seg; 315 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 316 bp->bio_ma += off / PAGE_SIZE; 317 bp->bio_ma_offset += off; 318 bp->bio_ma_offset %= PAGE_SIZE; 319 bp->bio_ma_n -= off / PAGE_SIZE; 320 } else { 321 bp->bio_data += off; 322 } 323 } 324 325 static void 326 g_disk_seg_limit(bus_dma_segment_t *seg, off_t *poffset, 327 off_t *plength, int *ppages) 328 { 329 uintptr_t seg_page_base; 330 uintptr_t seg_page_end; 331 off_t offset; 332 off_t length; 333 int seg_pages; 334 335 offset = *poffset; 336 length = *plength; 337 338 if (length > seg->ds_len - offset) 339 length = seg->ds_len - offset; 340 341 seg_page_base = trunc_page(seg->ds_addr + offset); 342 seg_page_end = round_page(seg->ds_addr + offset + length); 343 seg_pages = (seg_page_end - seg_page_base) >> PAGE_SHIFT; 344 345 if (seg_pages > *ppages) { 346 seg_pages = *ppages; 347 length = (seg_page_base + (seg_pages << PAGE_SHIFT)) - 348 (seg->ds_addr + offset); 349 } 350 351 *poffset = 0; 352 *plength -= length; 353 *ppages -= seg_pages; 354 } 355 356 static off_t 357 g_disk_vlist_limit(struct disk *dp, struct bio *bp, bus_dma_segment_t **pendseg) 358 { 359 bus_dma_segment_t *seg, *end; 360 off_t residual; 361 off_t offset; 362 int pages; 363 364 seg = (bus_dma_segment_t *)bp->bio_data; 365 end = (bus_dma_segment_t *)bp->bio_data + bp->bio_ma_n; 366 residual = bp->bio_length; 367 offset = bp->bio_ma_offset; 368 pages = g_disk_maxsegs(dp, bp); 369 while (residual != 0 && pages != 0) { 370 KASSERT((seg != end), 371 ("vlist limit runs off the end")); 372 g_disk_seg_limit(seg, &offset, &residual, &pages); 373 seg++; 374 } 375 if (pendseg != NULL) 376 *pendseg = seg; 377 return (residual); 378 } 379 380 static bool 381 g_disk_limit(struct disk *dp, struct bio *bp) 382 { 383 bool limited = false; 384 off_t maxsz; 385 386 maxsz = g_disk_maxsize(dp, bp); 387 388 /* 389 * XXX: If we have a stripesize we should really use it here. 390 * Care should be taken in the delete case if this is done 391 * as deletes can be very sensitive to size given how they 392 * are processed. 393 */ 394 if (bp->bio_length > maxsz) { 395 bp->bio_length = maxsz; 396 limited = true; 397 } 398 399 if ((bp->bio_flags & BIO_VLIST) != 0) { 400 bus_dma_segment_t *firstseg, *endseg; 401 off_t residual; 402 403 firstseg = (bus_dma_segment_t*)bp->bio_data; 404 residual = g_disk_vlist_limit(dp, bp, &endseg); 405 if (residual != 0) { 406 bp->bio_ma_n = endseg - firstseg; 407 bp->bio_length -= residual; 408 limited = true; 409 } 410 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 411 bp->bio_ma_n = 412 howmany(bp->bio_ma_offset + bp->bio_length, PAGE_SIZE); 413 } 414 415 return (limited); 416 } 417 418 static void 419 g_disk_start(struct bio *bp) 420 { 421 struct bio *bp2, *bp3; 422 struct disk *dp; 423 struct g_disk_softc *sc; 424 int error; 425 off_t off; 426 427 sc = bp->bio_to->private; 428 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) { 429 g_io_deliver(bp, ENXIO); 430 return; 431 } 432 error = EJUSTRETURN; 433 switch(bp->bio_cmd) { 434 case BIO_DELETE: 435 if (!(dp->d_flags & DISKFLAG_CANDELETE)) { 436 error = EOPNOTSUPP; 437 break; 438 } 439 /* fall-through */ 440 case BIO_READ: 441 case BIO_WRITE: 442 KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0 || 443 (bp->bio_flags & BIO_UNMAPPED) == 0, 444 ("unmapped bio not supported by disk %s", dp->d_name)); 445 off = 0; 446 bp3 = NULL; 447 bp2 = g_clone_bio(bp); 448 if (bp2 == NULL) { 449 error = ENOMEM; 450 break; 451 } 452 for (;;) { 453 if (g_disk_limit(dp, bp2)) { 454 off += bp2->bio_length; 455 456 /* 457 * To avoid a race, we need to grab the next bio 458 * before we schedule this one. See "notes". 459 */ 460 bp3 = g_clone_bio(bp); 461 if (bp3 == NULL) 462 bp->bio_error = ENOMEM; 463 } 464 bp2->bio_done = g_disk_done; 465 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 466 bp2->bio_bcount = bp2->bio_length; 467 bp2->bio_disk = dp; 468 mtx_lock(&sc->start_mtx); 469 devstat_start_transaction_bio(dp->d_devstat, bp2); 470 mtx_unlock(&sc->start_mtx); 471 g_disk_lock_giant(dp); 472 dp->d_strategy(bp2); 473 g_disk_unlock_giant(dp); 474 475 if (bp3 == NULL) 476 break; 477 478 bp2 = bp3; 479 bp3 = NULL; 480 g_disk_advance(dp, bp2, off); 481 } 482 break; 483 case BIO_GETATTR: 484 /* Give the driver a chance to override */ 485 if (dp->d_getattr != NULL) { 486 if (bp->bio_disk == NULL) 487 bp->bio_disk = dp; 488 error = dp->d_getattr(bp); 489 if (error != -1) 490 break; 491 error = EJUSTRETURN; 492 } 493 if (g_handleattr_int(bp, "GEOM::candelete", 494 (dp->d_flags & DISKFLAG_CANDELETE) != 0)) 495 break; 496 else if (g_handleattr_int(bp, "GEOM::fwsectors", 497 dp->d_fwsectors)) 498 break; 499 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 500 break; 501 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 502 break; 503 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident)) 504 break; 505 else if (g_handleattr_str(bp, "GEOM::descr", dp->d_descr)) 506 break; 507 else if (g_handleattr_uint16_t(bp, "GEOM::hba_vendor", 508 dp->d_hba_vendor)) 509 break; 510 else if (g_handleattr_uint16_t(bp, "GEOM::hba_device", 511 dp->d_hba_device)) 512 break; 513 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subvendor", 514 dp->d_hba_subvendor)) 515 break; 516 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subdevice", 517 dp->d_hba_subdevice)) 518 break; 519 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 520 g_disk_kerneldump(bp, dp); 521 else if (!strcmp(bp->bio_attribute, "GEOM::setstate")) 522 g_disk_setstate(bp, sc); 523 else if (!strcmp(bp->bio_attribute, "GEOM::rotation_rate")) { 524 uint64_t v; 525 526 if ((dp->d_flags & DISKFLAG_LACKS_ROTRATE) == 0) 527 v = dp->d_rotation_rate; 528 else 529 v = 0; /* rate unknown */ 530 g_handleattr_uint16_t(bp, "GEOM::rotation_rate", v); 531 break; 532 } else 533 error = ENOIOCTL; 534 break; 535 case BIO_FLUSH: 536 g_trace(G_T_BIO, "g_disk_flushcache(%s)", 537 bp->bio_to->name); 538 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) { 539 error = EOPNOTSUPP; 540 break; 541 } 542 bp2 = g_clone_bio(bp); 543 if (bp2 == NULL) { 544 g_io_deliver(bp, ENOMEM); 545 return; 546 } 547 bp2->bio_done = g_disk_done; 548 bp2->bio_disk = dp; 549 mtx_lock(&sc->start_mtx); 550 devstat_start_transaction_bio(dp->d_devstat, bp2); 551 mtx_unlock(&sc->start_mtx); 552 g_disk_lock_giant(dp); 553 dp->d_strategy(bp2); 554 g_disk_unlock_giant(dp); 555 break; 556 default: 557 error = EOPNOTSUPP; 558 break; 559 } 560 if (error != EJUSTRETURN) 561 g_io_deliver(bp, error); 562 return; 563 } 564 565 static void 566 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 567 { 568 struct bio *bp; 569 struct disk *dp; 570 struct g_disk_softc *sc; 571 char *buf; 572 int res = 0; 573 574 sc = gp->softc; 575 if (sc == NULL || (dp = sc->dp) == NULL) 576 return; 577 if (indent == NULL) { 578 sbuf_printf(sb, " hd %u", dp->d_fwheads); 579 sbuf_printf(sb, " sc %u", dp->d_fwsectors); 580 return; 581 } 582 if (pp != NULL) { 583 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", 584 indent, dp->d_fwheads); 585 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", 586 indent, dp->d_fwsectors); 587 588 /* 589 * "rotationrate" is a little complicated, because the value 590 * returned by the drive might not be the RPM; 0 and 1 are 591 * special cases, and there's also a valid range. 592 */ 593 sbuf_printf(sb, "%s<rotationrate>", indent); 594 if (dp->d_rotation_rate == DISK_RR_UNKNOWN) /* Old drives */ 595 sbuf_printf(sb, "unknown"); /* don't report RPM. */ 596 else if (dp->d_rotation_rate == DISK_RR_NON_ROTATING) 597 sbuf_printf(sb, ""); 598 else if ((dp->d_rotation_rate >= DISK_RR_MIN) && 599 (dp->d_rotation_rate <= DISK_RR_MAX)) 600 sbuf_printf(sb, "%u", dp->d_rotation_rate); 601 else 602 sbuf_printf(sb, "invalid"); 603 sbuf_printf(sb, "</rotationrate>\n"); 604 if (dp->d_getattr != NULL) { 605 buf = g_malloc(DISK_IDENT_SIZE, M_WAITOK); 606 bp = g_alloc_bio(); 607 bp->bio_disk = dp; 608 bp->bio_attribute = "GEOM::ident"; 609 bp->bio_length = DISK_IDENT_SIZE; 610 bp->bio_data = buf; 611 res = dp->d_getattr(bp); 612 sbuf_printf(sb, "%s<ident>", indent); 613 g_conf_printf_escaped(sb, "%s", 614 res == 0 ? buf: dp->d_ident); 615 sbuf_printf(sb, "</ident>\n"); 616 bp->bio_attribute = "GEOM::lunid"; 617 bp->bio_length = DISK_IDENT_SIZE; 618 bp->bio_data = buf; 619 if (dp->d_getattr(bp) == 0) { 620 sbuf_printf(sb, "%s<lunid>", indent); 621 g_conf_printf_escaped(sb, "%s", buf); 622 sbuf_printf(sb, "</lunid>\n"); 623 } 624 bp->bio_attribute = "GEOM::lunname"; 625 bp->bio_length = DISK_IDENT_SIZE; 626 bp->bio_data = buf; 627 if (dp->d_getattr(bp) == 0) { 628 sbuf_printf(sb, "%s<lunname>", indent); 629 g_conf_printf_escaped(sb, "%s", buf); 630 sbuf_printf(sb, "</lunname>\n"); 631 } 632 g_destroy_bio(bp); 633 g_free(buf); 634 } else { 635 sbuf_printf(sb, "%s<ident>", indent); 636 g_conf_printf_escaped(sb, "%s", dp->d_ident); 637 sbuf_printf(sb, "</ident>\n"); 638 } 639 sbuf_printf(sb, "%s<descr>", indent); 640 g_conf_printf_escaped(sb, "%s", dp->d_descr); 641 sbuf_printf(sb, "</descr>\n"); 642 } 643 } 644 645 static void 646 g_disk_resize(void *ptr, int flag) 647 { 648 struct disk *dp; 649 struct g_geom *gp; 650 struct g_provider *pp; 651 652 if (flag == EV_CANCEL) 653 return; 654 g_topology_assert(); 655 656 dp = ptr; 657 gp = dp->d_geom; 658 659 if (dp->d_destroyed || gp == NULL) 660 return; 661 662 LIST_FOREACH(pp, &gp->provider, provider) { 663 if (pp->sectorsize != 0 && 664 pp->sectorsize != dp->d_sectorsize) 665 g_wither_provider(pp, ENXIO); 666 else 667 g_resize_provider(pp, dp->d_mediasize); 668 } 669 } 670 671 static void 672 g_disk_create(void *arg, int flag) 673 { 674 struct g_geom *gp; 675 struct g_provider *pp; 676 struct disk *dp; 677 struct g_disk_softc *sc; 678 char tmpstr[80]; 679 680 if (flag == EV_CANCEL) 681 return; 682 g_topology_assert(); 683 dp = arg; 684 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 685 mtx_init(&sc->start_mtx, "g_disk_start", NULL, MTX_DEF); 686 mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF); 687 sc->dp = dp; 688 gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit); 689 gp->softc = sc; 690 pp = g_new_providerf(gp, "%s", gp->name); 691 devstat_remove_entry(pp->stat); 692 pp->stat = NULL; 693 dp->d_devstat->id = pp; 694 pp->mediasize = dp->d_mediasize; 695 pp->sectorsize = dp->d_sectorsize; 696 pp->stripeoffset = dp->d_stripeoffset; 697 pp->stripesize = dp->d_stripesize; 698 if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0) 699 pp->flags |= G_PF_ACCEPT_UNMAPPED; 700 if ((dp->d_flags & DISKFLAG_DIRECT_COMPLETION) != 0) 701 pp->flags |= G_PF_DIRECT_SEND; 702 pp->flags |= G_PF_DIRECT_RECEIVE; 703 if (bootverbose) 704 printf("GEOM: new disk %s\n", gp->name); 705 sysctl_ctx_init(&sc->sysctl_ctx); 706 snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name); 707 sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx, 708 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name, 709 CTLFLAG_RD, 0, tmpstr); 710 if (sc->sysctl_tree != NULL) { 711 snprintf(tmpstr, sizeof(tmpstr), 712 "kern.geom.disk.%s.led", gp->name); 713 TUNABLE_STR_FETCH(tmpstr, sc->led, sizeof(sc->led)); 714 SYSCTL_ADD_STRING(&sc->sysctl_ctx, 715 SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led", 716 CTLFLAG_RW | CTLFLAG_TUN, sc->led, sizeof(sc->led), 717 "LED name"); 718 } 719 pp->private = sc; 720 dp->d_geom = gp; 721 g_error_provider(pp, 0); 722 } 723 724 /* 725 * We get this callback after all of the consumers have gone away, and just 726 * before the provider is freed. If the disk driver provided a d_gone 727 * callback, let them know that it is okay to free resources -- they won't 728 * be getting any more accesses from GEOM. 729 */ 730 static void 731 g_disk_providergone(struct g_provider *pp) 732 { 733 struct disk *dp; 734 struct g_disk_softc *sc; 735 736 sc = (struct g_disk_softc *)pp->private; 737 dp = sc->dp; 738 if (dp != NULL && dp->d_gone != NULL) 739 dp->d_gone(dp); 740 if (sc->sysctl_tree != NULL) { 741 sysctl_ctx_free(&sc->sysctl_ctx); 742 sc->sysctl_tree = NULL; 743 } 744 if (sc->led[0] != 0) { 745 led_set(sc->led, ""); 746 sc->led[0] = 0; 747 } 748 pp->private = NULL; 749 pp->geom->softc = NULL; 750 mtx_destroy(&sc->done_mtx); 751 mtx_destroy(&sc->start_mtx); 752 g_free(sc); 753 } 754 755 static void 756 g_disk_destroy(void *ptr, int flag) 757 { 758 struct disk *dp; 759 struct g_geom *gp; 760 struct g_disk_softc *sc; 761 762 g_topology_assert(); 763 dp = ptr; 764 gp = dp->d_geom; 765 if (gp != NULL) { 766 sc = gp->softc; 767 if (sc != NULL) 768 sc->dp = NULL; 769 dp->d_geom = NULL; 770 g_wither_geom(gp, ENXIO); 771 } 772 g_free(dp); 773 } 774 775 /* 776 * We only allow printable characters in disk ident, 777 * the rest is converted to 'x<HH>'. 778 */ 779 static void 780 g_disk_ident_adjust(char *ident, size_t size) 781 { 782 char *p, tmp[4], newid[DISK_IDENT_SIZE]; 783 784 newid[0] = '\0'; 785 for (p = ident; *p != '\0'; p++) { 786 if (isprint(*p)) { 787 tmp[0] = *p; 788 tmp[1] = '\0'; 789 } else { 790 snprintf(tmp, sizeof(tmp), "x%02hhx", 791 *(unsigned char *)p); 792 } 793 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid)) 794 break; 795 } 796 bzero(ident, size); 797 strlcpy(ident, newid, size); 798 } 799 800 struct disk * 801 disk_alloc(void) 802 { 803 804 return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO)); 805 } 806 807 void 808 disk_create(struct disk *dp, int version) 809 { 810 811 if (version != DISK_VERSION) { 812 printf("WARNING: Attempt to add disk %s%d %s", 813 dp->d_name, dp->d_unit, 814 " using incompatible ABI version of disk(9)\n"); 815 printf("WARNING: Ignoring disk %s%d\n", 816 dp->d_name, dp->d_unit); 817 return; 818 } 819 if (version < DISK_VERSION_04) 820 dp->d_flags |= DISKFLAG_LACKS_ROTRATE; 821 KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy")); 822 KASSERT(dp->d_name != NULL, ("disk_create need d_name")); 823 KASSERT(*dp->d_name != 0, ("disk_create need d_name")); 824 KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long")); 825 if (dp->d_devstat == NULL) 826 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit, 827 dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED, 828 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 829 dp->d_geom = NULL; 830 g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident)); 831 g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL); 832 } 833 834 void 835 disk_destroy(struct disk *dp) 836 { 837 838 g_cancel_event(dp); 839 dp->d_destroyed = 1; 840 if (dp->d_devstat != NULL) 841 devstat_remove_entry(dp->d_devstat); 842 g_post_event(g_disk_destroy, dp, M_WAITOK, NULL); 843 } 844 845 void 846 disk_gone(struct disk *dp) 847 { 848 struct g_geom *gp; 849 struct g_provider *pp; 850 851 gp = dp->d_geom; 852 if (gp != NULL) { 853 pp = LIST_FIRST(&gp->provider); 854 if (pp != NULL) { 855 KASSERT(LIST_NEXT(pp, provider) == NULL, 856 ("geom %p has more than one provider", gp)); 857 g_wither_provider(pp, ENXIO); 858 } 859 } 860 } 861 862 void 863 disk_attr_changed(struct disk *dp, const char *attr, int flag) 864 { 865 struct g_geom *gp; 866 struct g_provider *pp; 867 char devnamebuf[128]; 868 869 gp = dp->d_geom; 870 if (gp != NULL) 871 LIST_FOREACH(pp, &gp->provider, provider) 872 (void)g_attr_changed(pp, attr, flag); 873 snprintf(devnamebuf, sizeof(devnamebuf), "devname=%s%d", dp->d_name, 874 dp->d_unit); 875 devctl_notify("GEOM", "disk", attr, devnamebuf); 876 } 877 878 void 879 disk_media_changed(struct disk *dp, int flag) 880 { 881 struct g_geom *gp; 882 struct g_provider *pp; 883 884 gp = dp->d_geom; 885 if (gp != NULL) { 886 pp = LIST_FIRST(&gp->provider); 887 if (pp != NULL) { 888 KASSERT(LIST_NEXT(pp, provider) == NULL, 889 ("geom %p has more than one provider", gp)); 890 g_media_changed(pp, flag); 891 } 892 } 893 } 894 895 void 896 disk_media_gone(struct disk *dp, int flag) 897 { 898 struct g_geom *gp; 899 struct g_provider *pp; 900 901 gp = dp->d_geom; 902 if (gp != NULL) { 903 pp = LIST_FIRST(&gp->provider); 904 if (pp != NULL) { 905 KASSERT(LIST_NEXT(pp, provider) == NULL, 906 ("geom %p has more than one provider", gp)); 907 g_media_gone(pp, flag); 908 } 909 } 910 } 911 912 int 913 disk_resize(struct disk *dp, int flag) 914 { 915 916 if (dp->d_destroyed || dp->d_geom == NULL) 917 return (0); 918 919 return (g_post_event(g_disk_resize, dp, flag, NULL)); 920 } 921 922 static void 923 g_kern_disks(void *p, int flag __unused) 924 { 925 struct sbuf *sb; 926 struct g_geom *gp; 927 char *sp; 928 929 sb = p; 930 sp = ""; 931 g_topology_assert(); 932 LIST_FOREACH(gp, &g_disk_class.geom, geom) { 933 sbuf_printf(sb, "%s%s", sp, gp->name); 934 sp = " "; 935 } 936 sbuf_finish(sb); 937 } 938 939 static int 940 sysctl_disks(SYSCTL_HANDLER_ARGS) 941 { 942 int error; 943 struct sbuf *sb; 944 945 sb = sbuf_new_auto(); 946 g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL); 947 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 948 sbuf_delete(sb); 949 return error; 950 } 951 952 SYSCTL_PROC(_kern, OID_AUTO, disks, 953 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 954 sysctl_disks, "A", "names of available disks");
Cache object: 5c92af225835581b1ef83cab01476f0e
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