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("$FreeBSD$"); 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 /* 138 * It would be better to defer this decision to d_open if 139 * it was able to take flags. 140 */ 141 if (w > 0 && (dp->d_flags & DISKFLAG_WRITE_PROTECT) != 0) 142 error = EROFS; 143 if (error == 0 && dp->d_open != NULL) { 144 g_disk_lock_giant(dp); 145 error = dp->d_open(dp); 146 g_disk_unlock_giant(dp); 147 } 148 if (bootverbose && error != 0) 149 printf("Opened disk %s -> %d\n", pp->name, error); 150 if (error != 0) 151 return (error); 152 pp->mediasize = dp->d_mediasize; 153 pp->sectorsize = dp->d_sectorsize; 154 if (dp->d_maxsize == 0) { 155 printf("WARNING: Disk drive %s%d has no d_maxsize\n", 156 dp->d_name, dp->d_unit); 157 dp->d_maxsize = DFLTPHYS; 158 } 159 if (dp->d_delmaxsize == 0) { 160 if (bootverbose && dp->d_flags & DISKFLAG_CANDELETE) { 161 printf("WARNING: Disk drive %s%d has no " 162 "d_delmaxsize\n", dp->d_name, dp->d_unit); 163 } 164 dp->d_delmaxsize = dp->d_maxsize; 165 } 166 pp->stripeoffset = dp->d_stripeoffset; 167 pp->stripesize = dp->d_stripesize; 168 dp->d_flags |= DISKFLAG_OPEN; 169 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 170 if (dp->d_close != NULL) { 171 g_disk_lock_giant(dp); 172 error = dp->d_close(dp); 173 if (error != 0) 174 printf("Closed disk %s -> %d\n", 175 pp->name, error); 176 g_disk_unlock_giant(dp); 177 } 178 sc->state = G_STATE_ACTIVE; 179 if (sc->led[0] != 0) 180 led_set(sc->led, ""); 181 dp->d_flags &= ~DISKFLAG_OPEN; 182 } 183 return (error); 184 } 185 186 static void 187 g_disk_kerneldump(struct bio *bp, struct disk *dp) 188 { 189 struct g_kerneldump *gkd; 190 struct g_geom *gp; 191 192 gkd = (struct g_kerneldump*)bp->bio_data; 193 gp = bp->bio_to->geom; 194 g_trace(G_T_TOPOLOGY, "g_disk_kerneldump(%s, %jd, %jd)", 195 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 196 if (dp->d_dump == NULL) { 197 g_io_deliver(bp, ENODEV); 198 return; 199 } 200 gkd->di.dumper = dp->d_dump; 201 gkd->di.priv = dp; 202 gkd->di.blocksize = dp->d_sectorsize; 203 gkd->di.maxiosize = dp->d_maxsize; 204 gkd->di.mediaoffset = gkd->offset; 205 if ((gkd->offset + gkd->length) > dp->d_mediasize) 206 gkd->length = dp->d_mediasize - gkd->offset; 207 gkd->di.mediasize = gkd->length; 208 g_io_deliver(bp, 0); 209 } 210 211 static void 212 g_disk_setstate(struct bio *bp, struct g_disk_softc *sc) 213 { 214 const char *cmd; 215 216 memcpy(&sc->state, bp->bio_data, sizeof(sc->state)); 217 if (sc->led[0] != 0) { 218 switch (sc->state) { 219 case G_STATE_FAILED: 220 cmd = "1"; 221 break; 222 case G_STATE_REBUILD: 223 cmd = "f5"; 224 break; 225 case G_STATE_RESYNC: 226 cmd = "f1"; 227 break; 228 default: 229 cmd = ""; 230 break; 231 } 232 led_set(sc->led, cmd); 233 } 234 g_io_deliver(bp, 0); 235 } 236 237 static void 238 g_disk_done(struct bio *bp) 239 { 240 struct bintime now; 241 struct bio *bp2; 242 struct g_disk_softc *sc; 243 244 /* See "notes" for why we need a mutex here */ 245 /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */ 246 bp2 = bp->bio_parent; 247 sc = bp2->bio_to->private; 248 bp->bio_completed = bp->bio_length - bp->bio_resid; 249 binuptime(&now); 250 mtx_lock(&sc->done_mtx); 251 if (bp2->bio_error == 0) 252 bp2->bio_error = bp->bio_error; 253 bp2->bio_completed += bp->bio_completed; 254 if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE|BIO_FLUSH)) != 0) 255 devstat_end_transaction_bio_bt(sc->dp->d_devstat, bp, &now); 256 bp2->bio_inbed++; 257 if (bp2->bio_children == bp2->bio_inbed) { 258 mtx_unlock(&sc->done_mtx); 259 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed; 260 g_io_deliver(bp2, bp2->bio_error); 261 } else 262 mtx_unlock(&sc->done_mtx); 263 g_destroy_bio(bp); 264 } 265 266 static int 267 g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td) 268 { 269 struct disk *dp; 270 struct g_disk_softc *sc; 271 int error; 272 273 sc = pp->private; 274 dp = sc->dp; 275 276 if (dp->d_ioctl == NULL) 277 return (ENOIOCTL); 278 g_disk_lock_giant(dp); 279 error = dp->d_ioctl(dp, cmd, data, fflag, td); 280 g_disk_unlock_giant(dp); 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 sc = bp->bio_to->private; 433 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) { 434 g_io_deliver(bp, ENXIO); 435 return; 436 } 437 error = EJUSTRETURN; 438 switch(bp->bio_cmd) { 439 case BIO_DELETE: 440 if (!(dp->d_flags & DISKFLAG_CANDELETE)) { 441 error = EOPNOTSUPP; 442 break; 443 } 444 /* fall-through */ 445 case BIO_READ: 446 case BIO_WRITE: 447 KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0 || 448 (bp->bio_flags & BIO_UNMAPPED) == 0, 449 ("unmapped bio not supported by disk %s", dp->d_name)); 450 off = 0; 451 bp3 = NULL; 452 bp2 = g_clone_bio(bp); 453 if (bp2 == NULL) { 454 error = ENOMEM; 455 break; 456 } 457 for (;;) { 458 if (g_disk_limit(dp, bp2)) { 459 off += bp2->bio_length; 460 461 /* 462 * To avoid a race, we need to grab the next bio 463 * before we schedule this one. See "notes". 464 */ 465 bp3 = g_clone_bio(bp); 466 if (bp3 == NULL) 467 bp->bio_error = ENOMEM; 468 } 469 bp2->bio_done = g_disk_done; 470 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 471 bp2->bio_bcount = bp2->bio_length; 472 bp2->bio_disk = dp; 473 mtx_lock(&sc->start_mtx); 474 devstat_start_transaction_bio(dp->d_devstat, bp2); 475 mtx_unlock(&sc->start_mtx); 476 g_disk_lock_giant(dp); 477 dp->d_strategy(bp2); 478 g_disk_unlock_giant(dp); 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 (!strcmp(bp->bio_attribute, "GEOM::rotation_rate")) { 529 uint64_t v; 530 531 if ((dp->d_flags & DISKFLAG_LACKS_ROTRATE) == 0) 532 v = dp->d_rotation_rate; 533 else 534 v = 0; /* rate unknown */ 535 g_handleattr_uint16_t(bp, "GEOM::rotation_rate", v); 536 break; 537 } else 538 error = ENOIOCTL; 539 break; 540 case BIO_FLUSH: 541 g_trace(G_T_BIO, "g_disk_flushcache(%s)", 542 bp->bio_to->name); 543 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) { 544 error = EOPNOTSUPP; 545 break; 546 } 547 bp2 = g_clone_bio(bp); 548 if (bp2 == NULL) { 549 g_io_deliver(bp, ENOMEM); 550 return; 551 } 552 bp2->bio_done = g_disk_done; 553 bp2->bio_disk = dp; 554 mtx_lock(&sc->start_mtx); 555 devstat_start_transaction_bio(dp->d_devstat, bp2); 556 mtx_unlock(&sc->start_mtx); 557 g_disk_lock_giant(dp); 558 dp->d_strategy(bp2); 559 g_disk_unlock_giant(dp); 560 break; 561 default: 562 error = EOPNOTSUPP; 563 break; 564 } 565 if (error != EJUSTRETURN) 566 g_io_deliver(bp, error); 567 return; 568 } 569 570 static void 571 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 572 { 573 struct bio *bp; 574 struct disk *dp; 575 struct g_disk_softc *sc; 576 char *buf; 577 int res = 0; 578 579 sc = gp->softc; 580 if (sc == NULL || (dp = sc->dp) == NULL) 581 return; 582 if (indent == NULL) { 583 sbuf_printf(sb, " hd %u", dp->d_fwheads); 584 sbuf_printf(sb, " sc %u", dp->d_fwsectors); 585 return; 586 } 587 if (pp != NULL) { 588 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", 589 indent, dp->d_fwheads); 590 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", 591 indent, dp->d_fwsectors); 592 593 /* 594 * "rotationrate" is a little complicated, because the value 595 * returned by the drive might not be the RPM; 0 and 1 are 596 * special cases, and there's also a valid range. 597 */ 598 sbuf_printf(sb, "%s<rotationrate>", indent); 599 if (dp->d_rotation_rate == DISK_RR_UNKNOWN) /* Old drives */ 600 sbuf_printf(sb, "unknown"); /* don't report RPM. */ 601 else if (dp->d_rotation_rate == DISK_RR_NON_ROTATING) 602 sbuf_printf(sb, ""); 603 else if ((dp->d_rotation_rate >= DISK_RR_MIN) && 604 (dp->d_rotation_rate <= DISK_RR_MAX)) 605 sbuf_printf(sb, "%u", dp->d_rotation_rate); 606 else 607 sbuf_printf(sb, "invalid"); 608 sbuf_printf(sb, "</rotationrate>\n"); 609 if (dp->d_getattr != NULL) { 610 buf = g_malloc(DISK_IDENT_SIZE, M_WAITOK); 611 bp = g_alloc_bio(); 612 bp->bio_disk = dp; 613 bp->bio_attribute = "GEOM::ident"; 614 bp->bio_length = DISK_IDENT_SIZE; 615 bp->bio_data = buf; 616 res = dp->d_getattr(bp); 617 sbuf_printf(sb, "%s<ident>", indent); 618 g_conf_printf_escaped(sb, "%s", 619 res == 0 ? buf: dp->d_ident); 620 sbuf_printf(sb, "</ident>\n"); 621 bp->bio_attribute = "GEOM::lunid"; 622 bp->bio_length = DISK_IDENT_SIZE; 623 bp->bio_data = buf; 624 if (dp->d_getattr(bp) == 0) { 625 sbuf_printf(sb, "%s<lunid>", indent); 626 g_conf_printf_escaped(sb, "%s", buf); 627 sbuf_printf(sb, "</lunid>\n"); 628 } 629 bp->bio_attribute = "GEOM::lunname"; 630 bp->bio_length = DISK_IDENT_SIZE; 631 bp->bio_data = buf; 632 if (dp->d_getattr(bp) == 0) { 633 sbuf_printf(sb, "%s<lunname>", indent); 634 g_conf_printf_escaped(sb, "%s", buf); 635 sbuf_printf(sb, "</lunname>\n"); 636 } 637 g_destroy_bio(bp); 638 g_free(buf); 639 } else { 640 sbuf_printf(sb, "%s<ident>", indent); 641 g_conf_printf_escaped(sb, "%s", dp->d_ident); 642 sbuf_printf(sb, "</ident>\n"); 643 } 644 sbuf_printf(sb, "%s<descr>", indent); 645 g_conf_printf_escaped(sb, "%s", dp->d_descr); 646 sbuf_printf(sb, "</descr>\n"); 647 } 648 } 649 650 static void 651 g_disk_resize(void *ptr, int flag) 652 { 653 struct disk *dp; 654 struct g_geom *gp; 655 struct g_provider *pp; 656 657 if (flag == EV_CANCEL) 658 return; 659 g_topology_assert(); 660 661 dp = ptr; 662 gp = dp->d_geom; 663 664 if (dp->d_destroyed || gp == NULL) 665 return; 666 667 LIST_FOREACH(pp, &gp->provider, provider) { 668 if (pp->sectorsize != 0 && 669 pp->sectorsize != dp->d_sectorsize) 670 g_wither_provider(pp, ENXIO); 671 else 672 g_resize_provider(pp, dp->d_mediasize); 673 } 674 } 675 676 static void 677 g_disk_create(void *arg, int flag) 678 { 679 struct g_geom *gp; 680 struct g_provider *pp; 681 struct disk *dp; 682 struct g_disk_softc *sc; 683 char tmpstr[80]; 684 685 if (flag == EV_CANCEL) 686 return; 687 g_topology_assert(); 688 dp = arg; 689 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 690 mtx_init(&sc->start_mtx, "g_disk_start", NULL, MTX_DEF); 691 mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF); 692 sc->dp = dp; 693 gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit); 694 gp->softc = sc; 695 pp = g_new_providerf(gp, "%s", gp->name); 696 devstat_remove_entry(pp->stat); 697 pp->stat = NULL; 698 dp->d_devstat->id = pp; 699 pp->mediasize = dp->d_mediasize; 700 pp->sectorsize = dp->d_sectorsize; 701 pp->stripeoffset = dp->d_stripeoffset; 702 pp->stripesize = dp->d_stripesize; 703 if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0) 704 pp->flags |= G_PF_ACCEPT_UNMAPPED; 705 if ((dp->d_flags & DISKFLAG_DIRECT_COMPLETION) != 0) 706 pp->flags |= G_PF_DIRECT_SEND; 707 pp->flags |= G_PF_DIRECT_RECEIVE; 708 if (bootverbose) 709 printf("GEOM: new disk %s\n", gp->name); 710 sysctl_ctx_init(&sc->sysctl_ctx); 711 snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name); 712 sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx, 713 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name, 714 CTLFLAG_RD, 0, tmpstr); 715 if (sc->sysctl_tree != NULL) { 716 snprintf(tmpstr, sizeof(tmpstr), 717 "kern.geom.disk.%s.led", gp->name); 718 TUNABLE_STR_FETCH(tmpstr, sc->led, sizeof(sc->led)); 719 SYSCTL_ADD_STRING(&sc->sysctl_ctx, 720 SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led", 721 CTLFLAG_RW | CTLFLAG_TUN, sc->led, sizeof(sc->led), 722 "LED name"); 723 } 724 pp->private = sc; 725 dp->d_geom = gp; 726 g_error_provider(pp, 0); 727 } 728 729 /* 730 * We get this callback after all of the consumers have gone away, and just 731 * before the provider is freed. If the disk driver provided a d_gone 732 * callback, let them know that it is okay to free resources -- they won't 733 * be getting any more accesses from GEOM. 734 */ 735 static void 736 g_disk_providergone(struct g_provider *pp) 737 { 738 struct disk *dp; 739 struct g_disk_softc *sc; 740 741 sc = (struct g_disk_softc *)pp->private; 742 dp = sc->dp; 743 if (dp != NULL && dp->d_gone != NULL) 744 dp->d_gone(dp); 745 if (sc->sysctl_tree != NULL) { 746 sysctl_ctx_free(&sc->sysctl_ctx); 747 sc->sysctl_tree = NULL; 748 } 749 if (sc->led[0] != 0) { 750 led_set(sc->led, ""); 751 sc->led[0] = 0; 752 } 753 pp->private = NULL; 754 pp->geom->softc = NULL; 755 mtx_destroy(&sc->done_mtx); 756 mtx_destroy(&sc->start_mtx); 757 g_free(sc); 758 } 759 760 static void 761 g_disk_destroy(void *ptr, int flag) 762 { 763 struct disk *dp; 764 struct g_geom *gp; 765 struct g_disk_softc *sc; 766 767 g_topology_assert(); 768 dp = ptr; 769 gp = dp->d_geom; 770 if (gp != NULL) { 771 sc = gp->softc; 772 if (sc != NULL) 773 sc->dp = NULL; 774 dp->d_geom = NULL; 775 g_wither_geom(gp, ENXIO); 776 } 777 g_free(dp); 778 } 779 780 /* 781 * We only allow printable characters in disk ident, 782 * the rest is converted to 'x<HH>'. 783 */ 784 static void 785 g_disk_ident_adjust(char *ident, size_t size) 786 { 787 char *p, tmp[4], newid[DISK_IDENT_SIZE]; 788 789 newid[0] = '\0'; 790 for (p = ident; *p != '\0'; p++) { 791 if (isprint(*p)) { 792 tmp[0] = *p; 793 tmp[1] = '\0'; 794 } else { 795 snprintf(tmp, sizeof(tmp), "x%02hhx", 796 *(unsigned char *)p); 797 } 798 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid)) 799 break; 800 } 801 bzero(ident, size); 802 strlcpy(ident, newid, size); 803 } 804 805 struct disk * 806 disk_alloc(void) 807 { 808 809 return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO)); 810 } 811 812 void 813 disk_create(struct disk *dp, int version) 814 { 815 816 if (version != DISK_VERSION) { 817 printf("WARNING: Attempt to add disk %s%d %s", 818 dp->d_name, dp->d_unit, 819 " using incompatible ABI version of disk(9)\n"); 820 printf("WARNING: Ignoring disk %s%d\n", 821 dp->d_name, dp->d_unit); 822 return; 823 } 824 if (version < DISK_VERSION_04) 825 dp->d_flags |= DISKFLAG_LACKS_ROTRATE; 826 KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy")); 827 KASSERT(dp->d_name != NULL, ("disk_create need d_name")); 828 KASSERT(*dp->d_name != 0, ("disk_create need d_name")); 829 KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long")); 830 if (dp->d_devstat == NULL) 831 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit, 832 dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED, 833 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 834 dp->d_geom = NULL; 835 g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident)); 836 g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL); 837 } 838 839 void 840 disk_destroy(struct disk *dp) 841 { 842 843 g_cancel_event(dp); 844 dp->d_destroyed = 1; 845 if (dp->d_devstat != NULL) 846 devstat_remove_entry(dp->d_devstat); 847 g_post_event(g_disk_destroy, dp, M_WAITOK, NULL); 848 } 849 850 void 851 disk_gone(struct disk *dp) 852 { 853 struct g_geom *gp; 854 struct g_provider *pp; 855 856 gp = dp->d_geom; 857 if (gp != NULL) { 858 pp = LIST_FIRST(&gp->provider); 859 if (pp != NULL) { 860 KASSERT(LIST_NEXT(pp, provider) == NULL, 861 ("geom %p has more than one provider", gp)); 862 g_wither_provider(pp, ENXIO); 863 } 864 } 865 } 866 867 void 868 disk_attr_changed(struct disk *dp, const char *attr, int flag) 869 { 870 struct g_geom *gp; 871 struct g_provider *pp; 872 char devnamebuf[128]; 873 874 gp = dp->d_geom; 875 if (gp != NULL) 876 LIST_FOREACH(pp, &gp->provider, provider) 877 (void)g_attr_changed(pp, attr, flag); 878 snprintf(devnamebuf, sizeof(devnamebuf), "devname=%s%d", dp->d_name, 879 dp->d_unit); 880 devctl_notify("GEOM", "disk", attr, devnamebuf); 881 } 882 883 void 884 disk_media_changed(struct disk *dp, int flag) 885 { 886 struct g_geom *gp; 887 struct g_provider *pp; 888 889 gp = dp->d_geom; 890 if (gp != NULL) { 891 pp = LIST_FIRST(&gp->provider); 892 if (pp != NULL) { 893 KASSERT(LIST_NEXT(pp, provider) == NULL, 894 ("geom %p has more than one provider", gp)); 895 g_media_changed(pp, flag); 896 } 897 } 898 } 899 900 void 901 disk_media_gone(struct disk *dp, int flag) 902 { 903 struct g_geom *gp; 904 struct g_provider *pp; 905 906 gp = dp->d_geom; 907 if (gp != NULL) { 908 pp = LIST_FIRST(&gp->provider); 909 if (pp != NULL) { 910 KASSERT(LIST_NEXT(pp, provider) == NULL, 911 ("geom %p has more than one provider", gp)); 912 g_media_gone(pp, flag); 913 } 914 } 915 } 916 917 int 918 disk_resize(struct disk *dp, int flag) 919 { 920 921 if (dp->d_destroyed || dp->d_geom == NULL) 922 return (0); 923 924 return (g_post_event(g_disk_resize, dp, flag, NULL)); 925 } 926 927 static void 928 g_kern_disks(void *p, int flag __unused) 929 { 930 struct sbuf *sb; 931 struct g_geom *gp; 932 char *sp; 933 934 sb = p; 935 sp = ""; 936 g_topology_assert(); 937 LIST_FOREACH(gp, &g_disk_class.geom, geom) { 938 sbuf_printf(sb, "%s%s", sp, gp->name); 939 sp = " "; 940 } 941 sbuf_finish(sb); 942 } 943 944 static int 945 sysctl_disks(SYSCTL_HANDLER_ARGS) 946 { 947 int error; 948 struct sbuf *sb; 949 950 sb = sbuf_new_auto(); 951 g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL); 952 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 953 sbuf_delete(sb); 954 return error; 955 } 956 957 SYSCTL_PROC(_kern, OID_AUTO, disks, 958 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 959 sysctl_disks, "A", "names of available disks");
Cache object: 332bb0c9ca77c142062f8eacebf11058
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