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/10.3/sys/geom/geom_disk.c 294483 2016-01-21 03:05:03Z rpokala $"); 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/ctype.h> 47 #include <sys/fcntl.h> 48 #include <sys/malloc.h> 49 #include <sys/sbuf.h> 50 #include <sys/devicestat.h> 51 #include <machine/md_var.h> 52 53 #include <sys/lock.h> 54 #include <sys/mutex.h> 55 #include <geom/geom.h> 56 #include <geom/geom_disk.h> 57 #include <geom/geom_int.h> 58 59 #include <dev/led/led.h> 60 61 #include <machine/bus.h> 62 63 struct g_disk_softc { 64 struct mtx done_mtx; 65 struct disk *dp; 66 struct sysctl_ctx_list sysctl_ctx; 67 struct sysctl_oid *sysctl_tree; 68 char led[64]; 69 uint32_t state; 70 struct mtx start_mtx; 71 }; 72 73 static g_access_t g_disk_access; 74 static g_start_t g_disk_start; 75 static g_ioctl_t g_disk_ioctl; 76 static g_dumpconf_t g_disk_dumpconf; 77 static g_provgone_t g_disk_providergone; 78 79 static struct g_class g_disk_class = { 80 .name = G_DISK_CLASS_NAME, 81 .version = G_VERSION, 82 .start = g_disk_start, 83 .access = g_disk_access, 84 .ioctl = g_disk_ioctl, 85 .providergone = g_disk_providergone, 86 .dumpconf = g_disk_dumpconf, 87 }; 88 89 SYSCTL_DECL(_kern_geom); 90 static SYSCTL_NODE(_kern_geom, OID_AUTO, disk, CTLFLAG_RW, 0, 91 "GEOM_DISK stuff"); 92 93 DECLARE_GEOM_CLASS(g_disk_class, g_disk); 94 95 static void __inline 96 g_disk_lock_giant(struct disk *dp) 97 { 98 99 if (dp->d_flags & DISKFLAG_NEEDSGIANT) 100 mtx_lock(&Giant); 101 } 102 103 static void __inline 104 g_disk_unlock_giant(struct disk *dp) 105 { 106 107 if (dp->d_flags & DISKFLAG_NEEDSGIANT) 108 mtx_unlock(&Giant); 109 } 110 111 static int 112 g_disk_access(struct g_provider *pp, int r, int w, int e) 113 { 114 struct disk *dp; 115 struct g_disk_softc *sc; 116 int error; 117 118 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 119 pp->name, r, w, e); 120 g_topology_assert(); 121 sc = pp->private; 122 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) { 123 /* 124 * Allow decreasing access count even if disk is not 125 * avaliable anymore. 126 */ 127 if (r <= 0 && w <= 0 && e <= 0) 128 return (0); 129 return (ENXIO); 130 } 131 r += pp->acr; 132 w += pp->acw; 133 e += pp->ace; 134 error = 0; 135 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 136 if (dp->d_open != NULL) { 137 g_disk_lock_giant(dp); 138 error = dp->d_open(dp); 139 if (bootverbose && error != 0) 140 printf("Opened disk %s -> %d\n", 141 pp->name, error); 142 g_disk_unlock_giant(dp); 143 if (error != 0) 144 return (error); 145 } 146 pp->mediasize = dp->d_mediasize; 147 pp->sectorsize = dp->d_sectorsize; 148 if (dp->d_maxsize == 0) { 149 printf("WARNING: Disk drive %s%d has no d_maxsize\n", 150 dp->d_name, dp->d_unit); 151 dp->d_maxsize = DFLTPHYS; 152 } 153 if (dp->d_delmaxsize == 0) { 154 if (bootverbose && dp->d_flags & DISKFLAG_CANDELETE) { 155 printf("WARNING: Disk drive %s%d has no " 156 "d_delmaxsize\n", dp->d_name, dp->d_unit); 157 } 158 dp->d_delmaxsize = dp->d_maxsize; 159 } 160 pp->stripeoffset = dp->d_stripeoffset; 161 pp->stripesize = dp->d_stripesize; 162 dp->d_flags |= DISKFLAG_OPEN; 163 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 164 if (dp->d_close != NULL) { 165 g_disk_lock_giant(dp); 166 error = dp->d_close(dp); 167 if (error != 0) 168 printf("Closed disk %s -> %d\n", 169 pp->name, error); 170 g_disk_unlock_giant(dp); 171 } 172 sc->state = G_STATE_ACTIVE; 173 if (sc->led[0] != 0) 174 led_set(sc->led, ""); 175 dp->d_flags &= ~DISKFLAG_OPEN; 176 } 177 return (error); 178 } 179 180 static void 181 g_disk_kerneldump(struct bio *bp, struct disk *dp) 182 { 183 struct g_kerneldump *gkd; 184 struct g_geom *gp; 185 186 gkd = (struct g_kerneldump*)bp->bio_data; 187 gp = bp->bio_to->geom; 188 g_trace(G_T_TOPOLOGY, "g_disk_kerneldump(%s, %jd, %jd)", 189 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 190 if (dp->d_dump == NULL) { 191 g_io_deliver(bp, ENODEV); 192 return; 193 } 194 gkd->di.dumper = dp->d_dump; 195 gkd->di.priv = dp; 196 gkd->di.blocksize = dp->d_sectorsize; 197 gkd->di.maxiosize = dp->d_maxsize; 198 gkd->di.mediaoffset = gkd->offset; 199 if ((gkd->offset + gkd->length) > dp->d_mediasize) 200 gkd->length = dp->d_mediasize - gkd->offset; 201 gkd->di.mediasize = gkd->length; 202 g_io_deliver(bp, 0); 203 } 204 205 static void 206 g_disk_setstate(struct bio *bp, struct g_disk_softc *sc) 207 { 208 const char *cmd; 209 210 memcpy(&sc->state, bp->bio_data, sizeof(sc->state)); 211 if (sc->led[0] != 0) { 212 switch (sc->state) { 213 case G_STATE_FAILED: 214 cmd = "1"; 215 break; 216 case G_STATE_REBUILD: 217 cmd = "f5"; 218 break; 219 case G_STATE_RESYNC: 220 cmd = "f1"; 221 break; 222 default: 223 cmd = ""; 224 break; 225 } 226 led_set(sc->led, cmd); 227 } 228 g_io_deliver(bp, 0); 229 } 230 231 static void 232 g_disk_done(struct bio *bp) 233 { 234 struct bintime now; 235 struct bio *bp2; 236 struct g_disk_softc *sc; 237 238 /* See "notes" for why we need a mutex here */ 239 /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */ 240 bp2 = bp->bio_parent; 241 sc = bp2->bio_to->private; 242 bp->bio_completed = bp->bio_length - bp->bio_resid; 243 binuptime(&now); 244 mtx_lock(&sc->done_mtx); 245 if (bp2->bio_error == 0) 246 bp2->bio_error = bp->bio_error; 247 bp2->bio_completed += bp->bio_completed; 248 if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE|BIO_FLUSH)) != 0) 249 devstat_end_transaction_bio_bt(sc->dp->d_devstat, bp, &now); 250 bp2->bio_inbed++; 251 if (bp2->bio_children == bp2->bio_inbed) { 252 mtx_unlock(&sc->done_mtx); 253 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed; 254 g_io_deliver(bp2, bp2->bio_error); 255 } else 256 mtx_unlock(&sc->done_mtx); 257 g_destroy_bio(bp); 258 } 259 260 static int 261 g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td) 262 { 263 struct disk *dp; 264 struct g_disk_softc *sc; 265 int error; 266 267 sc = pp->private; 268 dp = sc->dp; 269 270 if (dp->d_ioctl == NULL) 271 return (ENOIOCTL); 272 g_disk_lock_giant(dp); 273 error = dp->d_ioctl(dp, cmd, data, fflag, td); 274 g_disk_unlock_giant(dp); 275 return (error); 276 } 277 278 static off_t 279 g_disk_maxsize(struct disk *dp, struct bio *bp) 280 { 281 if (bp->bio_cmd == BIO_DELETE) 282 return (dp->d_delmaxsize); 283 return (dp->d_maxsize); 284 } 285 286 static int 287 g_disk_maxsegs(struct disk *dp, struct bio *bp) 288 { 289 return ((g_disk_maxsize(dp, bp) / PAGE_SIZE) + 1); 290 } 291 292 static void 293 g_disk_advance(struct disk *dp, struct bio *bp, off_t off) 294 { 295 296 bp->bio_offset += off; 297 bp->bio_length -= off; 298 299 if ((bp->bio_flags & BIO_VLIST) != 0) { 300 bus_dma_segment_t *seg, *end; 301 302 seg = (bus_dma_segment_t *)bp->bio_data; 303 end = (bus_dma_segment_t *)bp->bio_data + bp->bio_ma_n; 304 off += bp->bio_ma_offset; 305 while (off >= seg->ds_len) { 306 KASSERT((seg != end), 307 ("vlist request runs off the end")); 308 off -= seg->ds_len; 309 seg++; 310 } 311 bp->bio_ma_offset = off; 312 bp->bio_ma_n = end - seg; 313 bp->bio_data = (void *)seg; 314 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 315 bp->bio_ma += off / PAGE_SIZE; 316 bp->bio_ma_offset += off; 317 bp->bio_ma_offset %= PAGE_SIZE; 318 bp->bio_ma_n -= off / PAGE_SIZE; 319 } else { 320 bp->bio_data += off; 321 } 322 } 323 324 static void 325 g_disk_seg_limit(bus_dma_segment_t *seg, off_t *poffset, 326 off_t *plength, int *ppages) 327 { 328 uintptr_t seg_page_base; 329 uintptr_t seg_page_end; 330 off_t offset; 331 off_t length; 332 int seg_pages; 333 334 offset = *poffset; 335 length = *plength; 336 337 if (length > seg->ds_len - offset) 338 length = seg->ds_len - offset; 339 340 seg_page_base = trunc_page(seg->ds_addr + offset); 341 seg_page_end = round_page(seg->ds_addr + offset + length); 342 seg_pages = (seg_page_end - seg_page_base) >> PAGE_SHIFT; 343 344 if (seg_pages > *ppages) { 345 seg_pages = *ppages; 346 length = (seg_page_base + (seg_pages << PAGE_SHIFT)) - 347 (seg->ds_addr + offset); 348 } 349 350 *poffset = 0; 351 *plength -= length; 352 *ppages -= seg_pages; 353 } 354 355 static off_t 356 g_disk_vlist_limit(struct disk *dp, struct bio *bp, bus_dma_segment_t **pendseg) 357 { 358 bus_dma_segment_t *seg, *end; 359 off_t residual; 360 off_t offset; 361 int pages; 362 363 seg = (bus_dma_segment_t *)bp->bio_data; 364 end = (bus_dma_segment_t *)bp->bio_data + bp->bio_ma_n; 365 residual = bp->bio_length; 366 offset = bp->bio_ma_offset; 367 pages = g_disk_maxsegs(dp, bp); 368 while (residual != 0 && pages != 0) { 369 KASSERT((seg != end), 370 ("vlist limit runs off the end")); 371 g_disk_seg_limit(seg, &offset, &residual, &pages); 372 seg++; 373 } 374 if (pendseg != NULL) 375 *pendseg = seg; 376 return (residual); 377 } 378 379 static bool 380 g_disk_limit(struct disk *dp, struct bio *bp) 381 { 382 bool limited = false; 383 off_t maxsz; 384 385 maxsz = g_disk_maxsize(dp, bp); 386 387 /* 388 * XXX: If we have a stripesize we should really use it here. 389 * Care should be taken in the delete case if this is done 390 * as deletes can be very sensitive to size given how they 391 * are processed. 392 */ 393 if (bp->bio_length > maxsz) { 394 bp->bio_length = maxsz; 395 limited = true; 396 } 397 398 if ((bp->bio_flags & BIO_VLIST) != 0) { 399 bus_dma_segment_t *firstseg, *endseg; 400 off_t residual; 401 402 firstseg = (bus_dma_segment_t*)bp->bio_data; 403 residual = g_disk_vlist_limit(dp, bp, &endseg); 404 if (residual != 0) { 405 bp->bio_ma_n = endseg - firstseg; 406 bp->bio_length -= residual; 407 limited = true; 408 } 409 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 410 bp->bio_ma_n = 411 howmany(bp->bio_ma_offset + bp->bio_length, PAGE_SIZE); 412 } 413 414 return (limited); 415 } 416 417 static void 418 g_disk_start(struct bio *bp) 419 { 420 struct bio *bp2, *bp3; 421 struct disk *dp; 422 struct g_disk_softc *sc; 423 int error; 424 off_t off; 425 426 sc = bp->bio_to->private; 427 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) { 428 g_io_deliver(bp, ENXIO); 429 return; 430 } 431 error = EJUSTRETURN; 432 switch(bp->bio_cmd) { 433 case BIO_DELETE: 434 if (!(dp->d_flags & DISKFLAG_CANDELETE)) { 435 error = EOPNOTSUPP; 436 break; 437 } 438 /* fall-through */ 439 case BIO_READ: 440 case BIO_WRITE: 441 KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0 || 442 (bp->bio_flags & BIO_UNMAPPED) == 0, 443 ("unmapped bio not supported by disk %s", dp->d_name)); 444 off = 0; 445 bp3 = NULL; 446 bp2 = g_clone_bio(bp); 447 if (bp2 == NULL) { 448 error = ENOMEM; 449 break; 450 } 451 for (;;) { 452 if (g_disk_limit(dp, bp2)) { 453 off += bp2->bio_length; 454 455 /* 456 * To avoid a race, we need to grab the next bio 457 * before we schedule this one. See "notes". 458 */ 459 bp3 = g_clone_bio(bp); 460 if (bp3 == NULL) 461 bp->bio_error = ENOMEM; 462 } 463 bp2->bio_done = g_disk_done; 464 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 465 bp2->bio_bcount = bp2->bio_length; 466 bp2->bio_disk = dp; 467 mtx_lock(&sc->start_mtx); 468 devstat_start_transaction_bio(dp->d_devstat, bp2); 469 mtx_unlock(&sc->start_mtx); 470 g_disk_lock_giant(dp); 471 dp->d_strategy(bp2); 472 g_disk_unlock_giant(dp); 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_uint16_t(bp, "GEOM::hba_vendor", 505 dp->d_hba_vendor)) 506 break; 507 else if (g_handleattr_uint16_t(bp, "GEOM::hba_device", 508 dp->d_hba_device)) 509 break; 510 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subvendor", 511 dp->d_hba_subvendor)) 512 break; 513 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subdevice", 514 dp->d_hba_subdevice)) 515 break; 516 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 517 g_disk_kerneldump(bp, dp); 518 else if (!strcmp(bp->bio_attribute, "GEOM::setstate")) 519 g_disk_setstate(bp, sc); 520 else if (!strcmp(bp->bio_attribute, "GEOM::rotation_rate")) { 521 uint64_t v; 522 523 if ((dp->d_flags & DISKFLAG_LACKS_ROTRATE) == 0) 524 v = dp->d_rotation_rate; 525 else 526 v = 0; /* rate unknown */ 527 g_handleattr_uint16_t(bp, "GEOM::rotation_rate", v); 528 break; 529 } else 530 error = ENOIOCTL; 531 break; 532 case BIO_FLUSH: 533 g_trace(G_T_BIO, "g_disk_flushcache(%s)", 534 bp->bio_to->name); 535 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) { 536 error = EOPNOTSUPP; 537 break; 538 } 539 bp2 = g_clone_bio(bp); 540 if (bp2 == NULL) { 541 g_io_deliver(bp, ENOMEM); 542 return; 543 } 544 bp2->bio_done = g_disk_done; 545 bp2->bio_disk = dp; 546 mtx_lock(&sc->start_mtx); 547 devstat_start_transaction_bio(dp->d_devstat, bp2); 548 mtx_unlock(&sc->start_mtx); 549 g_disk_lock_giant(dp); 550 dp->d_strategy(bp2); 551 g_disk_unlock_giant(dp); 552 break; 553 default: 554 error = EOPNOTSUPP; 555 break; 556 } 557 if (error != EJUSTRETURN) 558 g_io_deliver(bp, error); 559 return; 560 } 561 562 static void 563 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 564 { 565 struct bio *bp; 566 struct disk *dp; 567 struct g_disk_softc *sc; 568 char *buf; 569 int res = 0; 570 571 sc = gp->softc; 572 if (sc == NULL || (dp = sc->dp) == NULL) 573 return; 574 if (indent == NULL) { 575 sbuf_printf(sb, " hd %u", dp->d_fwheads); 576 sbuf_printf(sb, " sc %u", dp->d_fwsectors); 577 return; 578 } 579 if (pp != NULL) { 580 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", 581 indent, dp->d_fwheads); 582 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", 583 indent, dp->d_fwsectors); 584 585 /* 586 * "rotationrate" is a little complicated, because the value 587 * returned by the drive might not be the RPM; 0 and 1 are 588 * special cases, and there's also a valid range. 589 */ 590 sbuf_printf(sb, "%s<rotationrate>", indent); 591 if (dp->d_rotation_rate == 0) /* Old drives don't */ 592 sbuf_printf(sb, "unknown"); /* report RPM. */ 593 else if (dp->d_rotation_rate == 1) /* Since 0 is used */ 594 sbuf_printf(sb, ""); /* above, SSDs use 1. */ 595 else if ((dp->d_rotation_rate >= 0x041) && 596 (dp->d_rotation_rate <= 0xfffe)) 597 sbuf_printf(sb, "%u", dp->d_rotation_rate); 598 else 599 sbuf_printf(sb, "invalid"); 600 sbuf_printf(sb, "</rotationrate>\n"); 601 if (dp->d_getattr != NULL) { 602 buf = g_malloc(DISK_IDENT_SIZE, M_WAITOK); 603 bp = g_alloc_bio(); 604 bp->bio_disk = dp; 605 bp->bio_attribute = "GEOM::ident"; 606 bp->bio_length = DISK_IDENT_SIZE; 607 bp->bio_data = buf; 608 res = dp->d_getattr(bp); 609 sbuf_printf(sb, "%s<ident>", indent); 610 g_conf_printf_escaped(sb, "%s", 611 res == 0 ? buf: dp->d_ident); 612 sbuf_printf(sb, "</ident>\n"); 613 bp->bio_attribute = "GEOM::lunid"; 614 bp->bio_length = DISK_IDENT_SIZE; 615 bp->bio_data = buf; 616 if (dp->d_getattr(bp) == 0) { 617 sbuf_printf(sb, "%s<lunid>", indent); 618 g_conf_printf_escaped(sb, "%s", buf); 619 sbuf_printf(sb, "</lunid>\n"); 620 } 621 bp->bio_attribute = "GEOM::lunname"; 622 bp->bio_length = DISK_IDENT_SIZE; 623 bp->bio_data = buf; 624 if (dp->d_getattr(bp) == 0) { 625 sbuf_printf(sb, "%s<lunname>", indent); 626 g_conf_printf_escaped(sb, "%s", buf); 627 sbuf_printf(sb, "</lunname>\n"); 628 } 629 g_destroy_bio(bp); 630 g_free(buf); 631 } else { 632 sbuf_printf(sb, "%s<ident>", indent); 633 g_conf_printf_escaped(sb, "%s", dp->d_ident); 634 sbuf_printf(sb, "</ident>\n"); 635 } 636 sbuf_printf(sb, "%s<descr>", indent); 637 g_conf_printf_escaped(sb, "%s", dp->d_descr); 638 sbuf_printf(sb, "</descr>\n"); 639 } 640 } 641 642 static void 643 g_disk_resize(void *ptr, int flag) 644 { 645 struct disk *dp; 646 struct g_geom *gp; 647 struct g_provider *pp; 648 649 if (flag == EV_CANCEL) 650 return; 651 g_topology_assert(); 652 653 dp = ptr; 654 gp = dp->d_geom; 655 656 if (dp->d_destroyed || gp == NULL) 657 return; 658 659 LIST_FOREACH(pp, &gp->provider, provider) { 660 if (pp->sectorsize != 0 && 661 pp->sectorsize != dp->d_sectorsize) 662 g_wither_provider(pp, ENXIO); 663 else 664 g_resize_provider(pp, dp->d_mediasize); 665 } 666 } 667 668 static void 669 g_disk_create(void *arg, int flag) 670 { 671 struct g_geom *gp; 672 struct g_provider *pp; 673 struct disk *dp; 674 struct g_disk_softc *sc; 675 char tmpstr[80]; 676 677 if (flag == EV_CANCEL) 678 return; 679 g_topology_assert(); 680 dp = arg; 681 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 682 mtx_init(&sc->start_mtx, "g_disk_start", NULL, MTX_DEF); 683 mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF); 684 sc->dp = dp; 685 gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit); 686 gp->softc = sc; 687 pp = g_new_providerf(gp, "%s", gp->name); 688 devstat_remove_entry(pp->stat); 689 pp->stat = NULL; 690 dp->d_devstat->id = pp; 691 pp->mediasize = dp->d_mediasize; 692 pp->sectorsize = dp->d_sectorsize; 693 pp->stripeoffset = dp->d_stripeoffset; 694 pp->stripesize = dp->d_stripesize; 695 if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0) 696 pp->flags |= G_PF_ACCEPT_UNMAPPED; 697 if ((dp->d_flags & DISKFLAG_DIRECT_COMPLETION) != 0) 698 pp->flags |= G_PF_DIRECT_SEND; 699 pp->flags |= G_PF_DIRECT_RECEIVE; 700 if (bootverbose) 701 printf("GEOM: new disk %s\n", gp->name); 702 sysctl_ctx_init(&sc->sysctl_ctx); 703 snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name); 704 sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx, 705 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name, 706 CTLFLAG_RD, 0, tmpstr); 707 if (sc->sysctl_tree != NULL) { 708 snprintf(tmpstr, sizeof(tmpstr), 709 "kern.geom.disk.%s.led", gp->name); 710 TUNABLE_STR_FETCH(tmpstr, sc->led, sizeof(sc->led)); 711 SYSCTL_ADD_STRING(&sc->sysctl_ctx, 712 SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led", 713 CTLFLAG_RW | CTLFLAG_TUN, sc->led, sizeof(sc->led), 714 "LED name"); 715 } 716 pp->private = sc; 717 dp->d_geom = gp; 718 g_error_provider(pp, 0); 719 } 720 721 /* 722 * We get this callback after all of the consumers have gone away, and just 723 * before the provider is freed. If the disk driver provided a d_gone 724 * callback, let them know that it is okay to free resources -- they won't 725 * be getting any more accesses from GEOM. 726 */ 727 static void 728 g_disk_providergone(struct g_provider *pp) 729 { 730 struct disk *dp; 731 struct g_disk_softc *sc; 732 733 sc = (struct g_disk_softc *)pp->private; 734 dp = sc->dp; 735 if (dp != NULL && dp->d_gone != NULL) 736 dp->d_gone(dp); 737 if (sc->sysctl_tree != NULL) { 738 sysctl_ctx_free(&sc->sysctl_ctx); 739 sc->sysctl_tree = NULL; 740 } 741 if (sc->led[0] != 0) { 742 led_set(sc->led, ""); 743 sc->led[0] = 0; 744 } 745 pp->private = NULL; 746 pp->geom->softc = NULL; 747 mtx_destroy(&sc->done_mtx); 748 mtx_destroy(&sc->start_mtx); 749 g_free(sc); 750 } 751 752 static void 753 g_disk_destroy(void *ptr, int flag) 754 { 755 struct disk *dp; 756 struct g_geom *gp; 757 struct g_disk_softc *sc; 758 759 g_topology_assert(); 760 dp = ptr; 761 gp = dp->d_geom; 762 if (gp != NULL) { 763 sc = gp->softc; 764 if (sc != NULL) 765 sc->dp = NULL; 766 dp->d_geom = NULL; 767 g_wither_geom(gp, ENXIO); 768 } 769 g_free(dp); 770 } 771 772 /* 773 * We only allow printable characters in disk ident, 774 * the rest is converted to 'x<HH>'. 775 */ 776 static void 777 g_disk_ident_adjust(char *ident, size_t size) 778 { 779 char *p, tmp[4], newid[DISK_IDENT_SIZE]; 780 781 newid[0] = '\0'; 782 for (p = ident; *p != '\0'; p++) { 783 if (isprint(*p)) { 784 tmp[0] = *p; 785 tmp[1] = '\0'; 786 } else { 787 snprintf(tmp, sizeof(tmp), "x%02hhx", 788 *(unsigned char *)p); 789 } 790 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid)) 791 break; 792 } 793 bzero(ident, size); 794 strlcpy(ident, newid, size); 795 } 796 797 struct disk * 798 disk_alloc(void) 799 { 800 801 return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO)); 802 } 803 804 void 805 disk_create(struct disk *dp, int version) 806 { 807 808 if (version != DISK_VERSION) { 809 printf("WARNING: Attempt to add disk %s%d %s", 810 dp->d_name, dp->d_unit, 811 " using incompatible ABI version of disk(9)\n"); 812 printf("WARNING: Ignoring disk %s%d\n", 813 dp->d_name, dp->d_unit); 814 return; 815 } 816 if (version < DISK_VERSION_04) 817 dp->d_flags |= DISKFLAG_LACKS_ROTRATE; 818 KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy")); 819 KASSERT(dp->d_name != NULL, ("disk_create need d_name")); 820 KASSERT(*dp->d_name != 0, ("disk_create need d_name")); 821 KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long")); 822 if (dp->d_devstat == NULL) 823 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit, 824 dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED, 825 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 826 dp->d_geom = NULL; 827 g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident)); 828 g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL); 829 } 830 831 void 832 disk_destroy(struct disk *dp) 833 { 834 835 g_cancel_event(dp); 836 dp->d_destroyed = 1; 837 if (dp->d_devstat != NULL) 838 devstat_remove_entry(dp->d_devstat); 839 g_post_event(g_disk_destroy, dp, M_WAITOK, NULL); 840 } 841 842 void 843 disk_gone(struct disk *dp) 844 { 845 struct g_geom *gp; 846 struct g_provider *pp; 847 848 gp = dp->d_geom; 849 if (gp != NULL) { 850 pp = LIST_FIRST(&gp->provider); 851 if (pp != NULL) { 852 KASSERT(LIST_NEXT(pp, provider) == NULL, 853 ("geom %p has more than one provider", gp)); 854 g_wither_provider(pp, ENXIO); 855 } 856 } 857 } 858 859 void 860 disk_attr_changed(struct disk *dp, const char *attr, int flag) 861 { 862 struct g_geom *gp; 863 struct g_provider *pp; 864 865 gp = dp->d_geom; 866 if (gp != NULL) 867 LIST_FOREACH(pp, &gp->provider, provider) 868 (void)g_attr_changed(pp, attr, flag); 869 } 870 871 void 872 disk_media_changed(struct disk *dp, int flag) 873 { 874 struct g_geom *gp; 875 struct g_provider *pp; 876 877 gp = dp->d_geom; 878 if (gp != NULL) { 879 pp = LIST_FIRST(&gp->provider); 880 if (pp != NULL) { 881 KASSERT(LIST_NEXT(pp, provider) == NULL, 882 ("geom %p has more than one provider", gp)); 883 g_media_changed(pp, flag); 884 } 885 } 886 } 887 888 void 889 disk_media_gone(struct disk *dp, int flag) 890 { 891 struct g_geom *gp; 892 struct g_provider *pp; 893 894 gp = dp->d_geom; 895 if (gp != NULL) { 896 pp = LIST_FIRST(&gp->provider); 897 if (pp != NULL) { 898 KASSERT(LIST_NEXT(pp, provider) == NULL, 899 ("geom %p has more than one provider", gp)); 900 g_media_gone(pp, flag); 901 } 902 } 903 } 904 905 int 906 disk_resize(struct disk *dp, int flag) 907 { 908 909 if (dp->d_destroyed || dp->d_geom == NULL) 910 return (0); 911 912 return (g_post_event(g_disk_resize, dp, flag, NULL)); 913 } 914 915 static void 916 g_kern_disks(void *p, int flag __unused) 917 { 918 struct sbuf *sb; 919 struct g_geom *gp; 920 char *sp; 921 922 sb = p; 923 sp = ""; 924 g_topology_assert(); 925 LIST_FOREACH(gp, &g_disk_class.geom, geom) { 926 sbuf_printf(sb, "%s%s", sp, gp->name); 927 sp = " "; 928 } 929 sbuf_finish(sb); 930 } 931 932 static int 933 sysctl_disks(SYSCTL_HANDLER_ARGS) 934 { 935 int error; 936 struct sbuf *sb; 937 938 sb = sbuf_new_auto(); 939 g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL); 940 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 941 sbuf_delete(sb); 942 return error; 943 } 944 945 SYSCTL_PROC(_kern, OID_AUTO, disks, 946 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 947 sysctl_disks, "A", "names of available disks");
Cache object: 68db8265b9b3865982f4950fce32d280
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