Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/dev/ld.c
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1 /* $NetBSD: ld.c,v 1.63 2008/09/09 12:45:39 tron Exp $ */ 2 3 /*- 4 * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Andrew Doran and Charles M. Hannum. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Disk driver for use by RAID controllers. 34 */ 35 36 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: ld.c,v 1.63 2008/09/09 12:45:39 tron Exp $"); 38 39 #include "rnd.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/device.h> 45 #include <sys/queue.h> 46 #include <sys/proc.h> 47 #include <sys/buf.h> 48 #include <sys/bufq.h> 49 #include <sys/endian.h> 50 #include <sys/disklabel.h> 51 #include <sys/disk.h> 52 #include <sys/dkio.h> 53 #include <sys/stat.h> 54 #include <sys/conf.h> 55 #include <sys/fcntl.h> 56 #include <sys/vnode.h> 57 #include <sys/syslog.h> 58 #include <sys/mutex.h> 59 #if NRND > 0 60 #include <sys/rnd.h> 61 #endif 62 63 #include <dev/ldvar.h> 64 65 #include <prop/proplib.h> 66 67 static void ldgetdefaultlabel(struct ld_softc *, struct disklabel *); 68 static void ldgetdisklabel(struct ld_softc *); 69 static void ldminphys(struct buf *bp); 70 static bool ld_shutdown(device_t, int); 71 static void ldstart(struct ld_softc *, struct buf *); 72 static void ld_set_properties(struct ld_softc *); 73 static void ld_config_interrupts (struct device *); 74 75 extern struct cfdriver ld_cd; 76 77 static dev_type_open(ldopen); 78 static dev_type_close(ldclose); 79 static dev_type_read(ldread); 80 static dev_type_write(ldwrite); 81 static dev_type_ioctl(ldioctl); 82 static dev_type_strategy(ldstrategy); 83 static dev_type_dump(lddump); 84 static dev_type_size(ldsize); 85 86 const struct bdevsw ld_bdevsw = { 87 ldopen, ldclose, ldstrategy, ldioctl, lddump, ldsize, D_DISK 88 }; 89 90 const struct cdevsw ld_cdevsw = { 91 ldopen, ldclose, ldread, ldwrite, ldioctl, 92 nostop, notty, nopoll, nommap, nokqfilter, D_DISK 93 }; 94 95 static struct dkdriver lddkdriver = { ldstrategy, ldminphys }; 96 97 void 98 ldattach(struct ld_softc *sc) 99 { 100 char tbuf[9]; 101 102 mutex_init(&sc->sc_mutex, MUTEX_DEFAULT, IPL_VM); 103 104 if ((sc->sc_flags & LDF_ENABLED) == 0) { 105 aprint_normal_dev(sc->sc_dv, "disabled\n"); 106 return; 107 } 108 109 /* Initialise and attach the disk structure. */ 110 disk_init(&sc->sc_dk, device_xname(sc->sc_dv), &lddkdriver); 111 disk_attach(&sc->sc_dk); 112 113 if (sc->sc_maxxfer > MAXPHYS) 114 sc->sc_maxxfer = MAXPHYS; 115 116 /* Build synthetic geometry if necessary. */ 117 if (sc->sc_nheads == 0 || sc->sc_nsectors == 0 || 118 sc->sc_ncylinders == 0) { 119 uint64_t ncyl; 120 121 if (sc->sc_secperunit <= 528 * 2048) /* 528MB */ 122 sc->sc_nheads = 16; 123 else if (sc->sc_secperunit <= 1024 * 2048) /* 1GB */ 124 sc->sc_nheads = 32; 125 else if (sc->sc_secperunit <= 21504 * 2048) /* 21GB */ 126 sc->sc_nheads = 64; 127 else if (sc->sc_secperunit <= 43008 * 2048) /* 42GB */ 128 sc->sc_nheads = 128; 129 else 130 sc->sc_nheads = 255; 131 132 sc->sc_nsectors = 63; 133 sc->sc_ncylinders = INT_MAX; 134 ncyl = sc->sc_secperunit / 135 (sc->sc_nheads * sc->sc_nsectors); 136 if (ncyl < INT_MAX) 137 sc->sc_ncylinders = (int)ncyl; 138 } 139 140 format_bytes(tbuf, sizeof(tbuf), sc->sc_secperunit * 141 sc->sc_secsize); 142 aprint_normal_dev(sc->sc_dv, "%s, %d cyl, %d head, %d sec, " 143 "%d bytes/sect x %"PRIu64" sectors\n", 144 tbuf, sc->sc_ncylinders, sc->sc_nheads, 145 sc->sc_nsectors, sc->sc_secsize, sc->sc_secperunit); 146 147 ld_set_properties(sc); 148 149 #if NRND > 0 150 /* Attach the device into the rnd source list. */ 151 rnd_attach_source(&sc->sc_rnd_source, device_xname(sc->sc_dv), 152 RND_TYPE_DISK, 0); 153 #endif 154 155 /* Register with PMF */ 156 if (!pmf_device_register1(sc->sc_dv, NULL, NULL, ld_shutdown)) 157 aprint_error_dev(sc->sc_dv, 158 "couldn't establish power handler\n"); 159 160 bufq_alloc(&sc->sc_bufq, BUFQ_DISK_DEFAULT_STRAT, BUFQ_SORT_RAWBLOCK); 161 162 /* Discover wedges on this disk. */ 163 config_interrupts(sc->sc_dv, ld_config_interrupts); 164 } 165 166 int 167 ldadjqparam(struct ld_softc *sc, int xmax) 168 { 169 int s; 170 171 s = splbio(); 172 sc->sc_maxqueuecnt = xmax; 173 splx(s); 174 175 return (0); 176 } 177 178 int 179 ldbegindetach(struct ld_softc *sc, int flags) 180 { 181 int s, rv = 0; 182 183 if ((sc->sc_flags & LDF_ENABLED) == 0) 184 return (0); 185 186 if ((flags & DETACH_FORCE) == 0 && sc->sc_dk.dk_openmask != 0) 187 return (EBUSY); 188 189 s = splbio(); 190 sc->sc_maxqueuecnt = 0; 191 sc->sc_flags |= LDF_DETACH; 192 while (sc->sc_queuecnt > 0) { 193 sc->sc_flags |= LDF_DRAIN; 194 rv = tsleep(&sc->sc_queuecnt, PRIBIO, "lddrn", 0); 195 if (rv) 196 break; 197 } 198 splx(s); 199 200 return (rv); 201 } 202 203 void 204 ldenddetach(struct ld_softc *sc) 205 { 206 int s, bmaj, cmaj, i, mn; 207 208 if ((sc->sc_flags & LDF_ENABLED) == 0) 209 return; 210 211 /* Wait for commands queued with the hardware to complete. */ 212 if (sc->sc_queuecnt != 0) 213 if (tsleep(&sc->sc_queuecnt, PRIBIO, "lddtch", 30 * hz)) 214 printf("%s: not drained\n", device_xname(sc->sc_dv)); 215 216 /* Locate the major numbers. */ 217 bmaj = bdevsw_lookup_major(&ld_bdevsw); 218 cmaj = cdevsw_lookup_major(&ld_cdevsw); 219 220 /* Kill off any queued buffers. */ 221 s = splbio(); 222 bufq_drain(sc->sc_bufq); 223 splx(s); 224 225 bufq_free(sc->sc_bufq); 226 227 /* Nuke the vnodes for any open instances. */ 228 for (i = 0; i < MAXPARTITIONS; i++) { 229 mn = DISKMINOR(device_unit(sc->sc_dv), i); 230 vdevgone(bmaj, mn, mn, VBLK); 231 vdevgone(cmaj, mn, mn, VCHR); 232 } 233 234 /* Delete all of our wedges. */ 235 dkwedge_delall(&sc->sc_dk); 236 237 /* Detach from the disk list. */ 238 disk_detach(&sc->sc_dk); 239 disk_destroy(&sc->sc_dk); 240 241 #if NRND > 0 242 /* Unhook the entropy source. */ 243 rnd_detach_source(&sc->sc_rnd_source); 244 #endif 245 246 /* Deregister with PMF */ 247 pmf_device_deregister(sc->sc_dv); 248 249 /* 250 * XXX We can't really flush the cache here, beceause the 251 * XXX device may already be non-existent from the controller's 252 * XXX perspective. 253 */ 254 #if 0 255 /* Flush the device's cache. */ 256 if (sc->sc_flush != NULL) 257 if ((*sc->sc_flush)(sc, 0) != 0) 258 aprint_error_dev(&sc->sc_dv, "unable to flush cache\n"); 259 #endif 260 mutex_destroy(&sc->sc_mutex); 261 } 262 263 /* ARGSUSED */ 264 static bool 265 ld_shutdown(device_t dev, int flags) 266 { 267 struct ld_softc *sc = device_private(dev); 268 269 if (sc->sc_flush != NULL && (*sc->sc_flush)(sc, LDFL_POLL) != 0) { 270 printf("%s: unable to flush cache\n", device_xname(dev)); 271 return false; 272 } 273 274 return true; 275 } 276 277 /* ARGSUSED */ 278 static int 279 ldopen(dev_t dev, int flags, int fmt, struct lwp *l) 280 { 281 struct ld_softc *sc; 282 int error, unit, part; 283 284 unit = DISKUNIT(dev); 285 if ((sc = device_lookup_private(&ld_cd, unit)) == NULL) 286 return (ENXIO); 287 if ((sc->sc_flags & LDF_ENABLED) == 0) 288 return (ENODEV); 289 part = DISKPART(dev); 290 291 mutex_enter(&sc->sc_dk.dk_openlock); 292 293 if (sc->sc_dk.dk_openmask == 0) { 294 /* Load the partition info if not already loaded. */ 295 if ((sc->sc_flags & LDF_VLABEL) == 0) 296 ldgetdisklabel(sc); 297 } 298 299 /* Check that the partition exists. */ 300 if (part != RAW_PART && (part >= sc->sc_dk.dk_label->d_npartitions || 301 sc->sc_dk.dk_label->d_partitions[part].p_fstype == FS_UNUSED)) { 302 error = ENXIO; 303 goto bad1; 304 } 305 306 /* Ensure only one open at a time. */ 307 switch (fmt) { 308 case S_IFCHR: 309 sc->sc_dk.dk_copenmask |= (1 << part); 310 break; 311 case S_IFBLK: 312 sc->sc_dk.dk_bopenmask |= (1 << part); 313 break; 314 } 315 sc->sc_dk.dk_openmask = 316 sc->sc_dk.dk_copenmask | sc->sc_dk.dk_bopenmask; 317 318 error = 0; 319 bad1: 320 mutex_exit(&sc->sc_dk.dk_openlock); 321 return (error); 322 } 323 324 /* ARGSUSED */ 325 static int 326 ldclose(dev_t dev, int flags, int fmt, struct lwp *l) 327 { 328 struct ld_softc *sc; 329 int part, unit; 330 331 unit = DISKUNIT(dev); 332 part = DISKPART(dev); 333 sc = device_lookup_private(&ld_cd, unit); 334 335 mutex_enter(&sc->sc_dk.dk_openlock); 336 337 switch (fmt) { 338 case S_IFCHR: 339 sc->sc_dk.dk_copenmask &= ~(1 << part); 340 break; 341 case S_IFBLK: 342 sc->sc_dk.dk_bopenmask &= ~(1 << part); 343 break; 344 } 345 sc->sc_dk.dk_openmask = 346 sc->sc_dk.dk_copenmask | sc->sc_dk.dk_bopenmask; 347 348 if (sc->sc_dk.dk_openmask == 0) { 349 if (sc->sc_flush != NULL && (*sc->sc_flush)(sc, 0) != 0) 350 aprint_error_dev(sc->sc_dv, "unable to flush cache\n"); 351 if ((sc->sc_flags & LDF_KLABEL) == 0) 352 sc->sc_flags &= ~LDF_VLABEL; 353 } 354 355 mutex_exit(&sc->sc_dk.dk_openlock); 356 return (0); 357 } 358 359 /* ARGSUSED */ 360 static int 361 ldread(dev_t dev, struct uio *uio, int ioflag) 362 { 363 364 return (physio(ldstrategy, NULL, dev, B_READ, ldminphys, uio)); 365 } 366 367 /* ARGSUSED */ 368 static int 369 ldwrite(dev_t dev, struct uio *uio, int ioflag) 370 { 371 372 return (physio(ldstrategy, NULL, dev, B_WRITE, ldminphys, uio)); 373 } 374 375 /* ARGSUSED */ 376 static int 377 ldioctl(dev_t dev, u_long cmd, void *addr, int32_t flag, struct lwp *l) 378 { 379 struct ld_softc *sc; 380 int part, unit, error; 381 #ifdef __HAVE_OLD_DISKLABEL 382 struct disklabel newlabel; 383 #endif 384 struct disklabel *lp; 385 386 unit = DISKUNIT(dev); 387 part = DISKPART(dev); 388 sc = device_lookup_private(&ld_cd, unit); 389 390 error = disk_ioctl(&sc->sc_dk, cmd, addr, flag, l); 391 if (error != EPASSTHROUGH) 392 return (error); 393 394 error = 0; 395 switch (cmd) { 396 case DIOCGDINFO: 397 memcpy(addr, sc->sc_dk.dk_label, sizeof(struct disklabel)); 398 return (0); 399 400 #ifdef __HAVE_OLD_DISKLABEL 401 case ODIOCGDINFO: 402 newlabel = *(sc->sc_dk.dk_label); 403 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 404 return ENOTTY; 405 memcpy(addr, &newlabel, sizeof(struct olddisklabel)); 406 return (0); 407 #endif 408 409 case DIOCGPART: 410 ((struct partinfo *)addr)->disklab = sc->sc_dk.dk_label; 411 ((struct partinfo *)addr)->part = 412 &sc->sc_dk.dk_label->d_partitions[part]; 413 break; 414 415 case DIOCWDINFO: 416 case DIOCSDINFO: 417 #ifdef __HAVE_OLD_DISKLABEL 418 case ODIOCWDINFO: 419 case ODIOCSDINFO: 420 421 if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) { 422 memset(&newlabel, 0, sizeof newlabel); 423 memcpy(&newlabel, addr, sizeof (struct olddisklabel)); 424 lp = &newlabel; 425 } else 426 #endif 427 lp = (struct disklabel *)addr; 428 429 if ((flag & FWRITE) == 0) 430 return (EBADF); 431 432 mutex_enter(&sc->sc_dk.dk_openlock); 433 sc->sc_flags |= LDF_LABELLING; 434 435 error = setdisklabel(sc->sc_dk.dk_label, 436 lp, /*sc->sc_dk.dk_openmask : */0, 437 sc->sc_dk.dk_cpulabel); 438 if (error == 0 && (cmd == DIOCWDINFO 439 #ifdef __HAVE_OLD_DISKLABEL 440 || cmd == ODIOCWDINFO 441 #endif 442 )) 443 error = writedisklabel( 444 MAKEDISKDEV(major(dev), DISKUNIT(dev), RAW_PART), 445 ldstrategy, sc->sc_dk.dk_label, 446 sc->sc_dk.dk_cpulabel); 447 448 sc->sc_flags &= ~LDF_LABELLING; 449 mutex_exit(&sc->sc_dk.dk_openlock); 450 break; 451 452 case DIOCKLABEL: 453 if ((flag & FWRITE) == 0) 454 return (EBADF); 455 if (*(int *)addr) 456 sc->sc_flags |= LDF_KLABEL; 457 else 458 sc->sc_flags &= ~LDF_KLABEL; 459 break; 460 461 case DIOCWLABEL: 462 if ((flag & FWRITE) == 0) 463 return (EBADF); 464 if (*(int *)addr) 465 sc->sc_flags |= LDF_WLABEL; 466 else 467 sc->sc_flags &= ~LDF_WLABEL; 468 break; 469 470 case DIOCGDEFLABEL: 471 ldgetdefaultlabel(sc, (struct disklabel *)addr); 472 break; 473 474 #ifdef __HAVE_OLD_DISKLABEL 475 case ODIOCGDEFLABEL: 476 ldgetdefaultlabel(sc, &newlabel); 477 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 478 return ENOTTY; 479 memcpy(addr, &newlabel, sizeof (struct olddisklabel)); 480 break; 481 #endif 482 483 case DIOCCACHESYNC: 484 /* 485 * XXX Do we really need to care about having a writable 486 * file descriptor here? 487 */ 488 if ((flag & FWRITE) == 0) 489 error = EBADF; 490 else if (sc->sc_flush) 491 error = (*sc->sc_flush)(sc, 0); 492 else 493 error = 0; /* XXX Error out instead? */ 494 break; 495 496 case DIOCAWEDGE: 497 { 498 struct dkwedge_info *dkw = (void *) addr; 499 500 if ((flag & FWRITE) == 0) 501 return (EBADF); 502 503 /* If the ioctl happens here, the parent is us. */ 504 strlcpy(dkw->dkw_parent, device_xname(sc->sc_dv), 505 sizeof(dkw->dkw_parent)); 506 return (dkwedge_add(dkw)); 507 } 508 509 case DIOCDWEDGE: 510 { 511 struct dkwedge_info *dkw = (void *) addr; 512 513 if ((flag & FWRITE) == 0) 514 return (EBADF); 515 516 /* If the ioctl happens here, the parent is us. */ 517 strlcpy(dkw->dkw_parent, device_xname(sc->sc_dv), 518 sizeof(dkw->dkw_parent)); 519 return (dkwedge_del(dkw)); 520 } 521 522 case DIOCLWEDGES: 523 { 524 struct dkwedge_list *dkwl = (void *) addr; 525 526 return (dkwedge_list(&sc->sc_dk, dkwl, l)); 527 } 528 case DIOCGSTRATEGY: 529 { 530 struct disk_strategy *dks = (void *)addr; 531 532 mutex_enter(&sc->sc_mutex); 533 strlcpy(dks->dks_name, bufq_getstrategyname(sc->sc_bufq), 534 sizeof(dks->dks_name)); 535 mutex_exit(&sc->sc_mutex); 536 dks->dks_paramlen = 0; 537 538 return 0; 539 } 540 case DIOCSSTRATEGY: 541 { 542 struct disk_strategy *dks = (void *)addr; 543 struct bufq_state *new, *old; 544 545 if ((flag & FWRITE) == 0) 546 return EPERM; 547 548 if (dks->dks_param != NULL) 549 return EINVAL; 550 551 dks->dks_name[sizeof(dks->dks_name) - 1] = 0; /* ensure term */ 552 error = bufq_alloc(&new, dks->dks_name, 553 BUFQ_EXACT|BUFQ_SORT_RAWBLOCK); 554 if (error) 555 return error; 556 557 mutex_enter(&sc->sc_mutex); 558 old = sc->sc_bufq; 559 bufq_move(new, old); 560 sc->sc_bufq = new; 561 mutex_exit(&sc->sc_mutex); 562 bufq_free(old); 563 564 return 0; 565 } 566 default: 567 error = ENOTTY; 568 break; 569 } 570 571 return (error); 572 } 573 574 static void 575 ldstrategy(struct buf *bp) 576 { 577 struct ld_softc *sc; 578 struct disklabel *lp; 579 daddr_t blkno; 580 int s, part; 581 582 sc = device_lookup_private(&ld_cd, DISKUNIT(bp->b_dev)); 583 part = DISKPART(bp->b_dev); 584 585 if ((sc->sc_flags & LDF_DETACH) != 0) { 586 bp->b_error = EIO; 587 goto done; 588 } 589 590 lp = sc->sc_dk.dk_label; 591 592 /* 593 * The transfer must be a whole number of blocks and the offset must 594 * not be negative. 595 */ 596 if ((bp->b_bcount % lp->d_secsize) != 0 || bp->b_blkno < 0) { 597 bp->b_error = EINVAL; 598 goto done; 599 } 600 601 /* If it's a null transfer, return immediately. */ 602 if (bp->b_bcount == 0) 603 goto done; 604 605 /* 606 * Do bounds checking and adjust the transfer. If error, process. 607 * If past the end of partition, just return. 608 */ 609 if (part != RAW_PART && 610 bounds_check_with_label(&sc->sc_dk, bp, 611 (sc->sc_flags & (LDF_WLABEL | LDF_LABELLING)) != 0) <= 0) { 612 goto done; 613 } 614 615 /* 616 * Convert the block number to absolute and put it in terms 617 * of the device's logical block size. 618 */ 619 if (lp->d_secsize == DEV_BSIZE) 620 blkno = bp->b_blkno; 621 else if (lp->d_secsize > DEV_BSIZE) 622 blkno = bp->b_blkno / (lp->d_secsize / DEV_BSIZE); 623 else 624 blkno = bp->b_blkno * (DEV_BSIZE / lp->d_secsize); 625 626 if (part != RAW_PART) 627 blkno += lp->d_partitions[part].p_offset; 628 629 bp->b_rawblkno = blkno; 630 631 s = splbio(); 632 ldstart(sc, bp); 633 splx(s); 634 return; 635 636 done: 637 bp->b_resid = bp->b_bcount; 638 biodone(bp); 639 } 640 641 static void 642 ldstart(struct ld_softc *sc, struct buf *bp) 643 { 644 int error; 645 646 mutex_enter(&sc->sc_mutex); 647 648 if (bp != NULL) 649 BUFQ_PUT(sc->sc_bufq, bp); 650 651 while (sc->sc_queuecnt < sc->sc_maxqueuecnt) { 652 /* See if there is work to do. */ 653 if ((bp = BUFQ_PEEK(sc->sc_bufq)) == NULL) 654 break; 655 656 disk_busy(&sc->sc_dk); 657 sc->sc_queuecnt++; 658 659 if (__predict_true((error = (*sc->sc_start)(sc, bp)) == 0)) { 660 /* 661 * The back-end is running the job; remove it from 662 * the queue. 663 */ 664 (void) BUFQ_GET(sc->sc_bufq); 665 } else { 666 disk_unbusy(&sc->sc_dk, 0, (bp->b_flags & B_READ)); 667 sc->sc_queuecnt--; 668 if (error == EAGAIN) { 669 /* 670 * Temporary resource shortage in the 671 * back-end; just defer the job until 672 * later. 673 * 674 * XXX We might consider a watchdog timer 675 * XXX to make sure we are kicked into action. 676 */ 677 break; 678 } else { 679 (void) BUFQ_GET(sc->sc_bufq); 680 bp->b_error = error; 681 bp->b_resid = bp->b_bcount; 682 mutex_exit(&sc->sc_mutex); 683 biodone(bp); 684 mutex_enter(&sc->sc_mutex); 685 } 686 } 687 } 688 689 mutex_exit(&sc->sc_mutex); 690 } 691 692 void 693 lddone(struct ld_softc *sc, struct buf *bp) 694 { 695 696 if (bp->b_error != 0) { 697 diskerr(bp, "ld", "error", LOG_PRINTF, 0, sc->sc_dk.dk_label); 698 printf("\n"); 699 } 700 701 disk_unbusy(&sc->sc_dk, bp->b_bcount - bp->b_resid, 702 (bp->b_flags & B_READ)); 703 #if NRND > 0 704 rnd_add_uint32(&sc->sc_rnd_source, bp->b_rawblkno); 705 #endif 706 biodone(bp); 707 708 mutex_enter(&sc->sc_mutex); 709 if (--sc->sc_queuecnt <= sc->sc_maxqueuecnt) { 710 if ((sc->sc_flags & LDF_DRAIN) != 0) { 711 sc->sc_flags &= ~LDF_DRAIN; 712 wakeup(&sc->sc_queuecnt); 713 } 714 mutex_exit(&sc->sc_mutex); 715 ldstart(sc, NULL); 716 } else 717 mutex_exit(&sc->sc_mutex); 718 } 719 720 static int 721 ldsize(dev_t dev) 722 { 723 struct ld_softc *sc; 724 int part, unit, omask, size; 725 726 unit = DISKUNIT(dev); 727 if ((sc = device_lookup_private(&ld_cd, unit)) == NULL) 728 return (ENODEV); 729 if ((sc->sc_flags & LDF_ENABLED) == 0) 730 return (ENODEV); 731 part = DISKPART(dev); 732 733 omask = sc->sc_dk.dk_openmask & (1 << part); 734 735 if (omask == 0 && ldopen(dev, 0, S_IFBLK, NULL) != 0) 736 return (-1); 737 else if (sc->sc_dk.dk_label->d_partitions[part].p_fstype != FS_SWAP) 738 size = -1; 739 else 740 size = sc->sc_dk.dk_label->d_partitions[part].p_size * 741 (sc->sc_dk.dk_label->d_secsize / DEV_BSIZE); 742 if (omask == 0 && ldclose(dev, 0, S_IFBLK, NULL) != 0) 743 return (-1); 744 745 return (size); 746 } 747 748 /* 749 * Load the label information from the specified device. 750 */ 751 static void 752 ldgetdisklabel(struct ld_softc *sc) 753 { 754 const char *errstring; 755 756 ldgetdefaultlabel(sc, sc->sc_dk.dk_label); 757 758 /* Call the generic disklabel extraction routine. */ 759 errstring = readdisklabel(MAKEDISKDEV(0, device_unit(sc->sc_dv), 760 RAW_PART), ldstrategy, sc->sc_dk.dk_label, sc->sc_dk.dk_cpulabel); 761 if (errstring != NULL) 762 printf("%s: %s\n", device_xname(sc->sc_dv), errstring); 763 764 /* In-core label now valid. */ 765 sc->sc_flags |= LDF_VLABEL; 766 } 767 768 /* 769 * Construct a ficticious label. 770 */ 771 static void 772 ldgetdefaultlabel(struct ld_softc *sc, struct disklabel *lp) 773 { 774 775 memset(lp, 0, sizeof(struct disklabel)); 776 777 lp->d_secsize = sc->sc_secsize; 778 lp->d_ntracks = sc->sc_nheads; 779 lp->d_nsectors = sc->sc_nsectors; 780 lp->d_ncylinders = sc->sc_ncylinders; 781 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 782 lp->d_type = DTYPE_LD; 783 strlcpy(lp->d_typename, "unknown", sizeof(lp->d_typename)); 784 strlcpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); 785 lp->d_secperunit = sc->sc_secperunit; 786 lp->d_rpm = 7200; 787 lp->d_interleave = 1; 788 lp->d_flags = 0; 789 790 lp->d_partitions[RAW_PART].p_offset = 0; 791 lp->d_partitions[RAW_PART].p_size = 792 lp->d_secperunit * (lp->d_secsize / DEV_BSIZE); 793 lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED; 794 lp->d_npartitions = RAW_PART + 1; 795 796 lp->d_magic = DISKMAGIC; 797 lp->d_magic2 = DISKMAGIC; 798 lp->d_checksum = dkcksum(lp); 799 } 800 801 /* 802 * Take a dump. 803 */ 804 static int 805 lddump(dev_t dev, daddr_t blkno, void *vav, size_t size) 806 { 807 char *va = vav; 808 struct ld_softc *sc; 809 struct disklabel *lp; 810 int unit, part, nsects, sectoff, towrt, nblk, maxblkcnt, rv; 811 static int dumping; 812 813 unit = DISKUNIT(dev); 814 if ((sc = device_lookup_private(&ld_cd, unit)) == NULL) 815 return (ENXIO); 816 if ((sc->sc_flags & LDF_ENABLED) == 0) 817 return (ENODEV); 818 if (sc->sc_dump == NULL) 819 return (ENXIO); 820 821 /* Check if recursive dump; if so, punt. */ 822 if (dumping) 823 return (EFAULT); 824 dumping = 1; 825 826 /* Convert to disk sectors. Request must be a multiple of size. */ 827 part = DISKPART(dev); 828 lp = sc->sc_dk.dk_label; 829 if ((size % lp->d_secsize) != 0) 830 return (EFAULT); 831 towrt = size / lp->d_secsize; 832 blkno = dbtob(blkno) / lp->d_secsize; /* blkno in DEV_BSIZE units */ 833 834 nsects = lp->d_partitions[part].p_size; 835 sectoff = lp->d_partitions[part].p_offset; 836 837 /* Check transfer bounds against partition size. */ 838 if ((blkno < 0) || ((blkno + towrt) > nsects)) 839 return (EINVAL); 840 841 /* Offset block number to start of partition. */ 842 blkno += sectoff; 843 844 /* Start dumping and return when done. */ 845 maxblkcnt = sc->sc_maxxfer / sc->sc_secsize - 1; 846 while (towrt > 0) { 847 nblk = min(maxblkcnt, towrt); 848 849 if ((rv = (*sc->sc_dump)(sc, va, blkno, nblk)) != 0) 850 return (rv); 851 852 towrt -= nblk; 853 blkno += nblk; 854 va += nblk * sc->sc_secsize; 855 } 856 857 dumping = 0; 858 return (0); 859 } 860 861 /* 862 * Adjust the size of a transfer. 863 */ 864 static void 865 ldminphys(struct buf *bp) 866 { 867 struct ld_softc *sc; 868 869 sc = device_lookup_private(&ld_cd, DISKUNIT(bp->b_dev)); 870 871 if (bp->b_bcount > sc->sc_maxxfer) 872 bp->b_bcount = sc->sc_maxxfer; 873 minphys(bp); 874 } 875 876 static void 877 ld_set_properties(struct ld_softc *ld) 878 { 879 prop_dictionary_t disk_info, odisk_info, geom; 880 881 disk_info = prop_dictionary_create(); 882 883 geom = prop_dictionary_create(); 884 885 prop_dictionary_set_uint64(geom, "sectors-per-unit", 886 ld->sc_secperunit); 887 888 prop_dictionary_set_uint32(geom, "sector-size", 889 ld->sc_secsize); 890 891 prop_dictionary_set_uint16(geom, "sectors-per-track", 892 ld->sc_nsectors); 893 894 prop_dictionary_set_uint16(geom, "tracks-per-cylinder", 895 ld->sc_nheads); 896 897 prop_dictionary_set_uint64(geom, "cylinders-per-unit", 898 ld->sc_ncylinders); 899 900 prop_dictionary_set(disk_info, "geometry", geom); 901 prop_object_release(geom); 902 903 prop_dictionary_set(device_properties(ld->sc_dv), 904 "disk-info", disk_info); 905 906 /* 907 * Don't release disk_info here; we keep a reference to it. 908 * disk_detach() will release it when we go away. 909 */ 910 911 odisk_info = ld->sc_dk.dk_info; 912 ld->sc_dk.dk_info = disk_info; 913 if (odisk_info) 914 prop_object_release(odisk_info); 915 } 916 917 static void 918 ld_config_interrupts (struct device *d) 919 { 920 struct ld_softc *sc = device_private(d); 921 dkwedge_discover(&sc->sc_dk); 922 }
Cache object: 198ae72d8a0045545e7b2bb77a03cf47
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