ld.c revision 1.54.6.7
1 /* $NetBSD: ld.c,v 1.54.6.7 2009/01/17 13:28:52 mjf 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 1.54.6.7 2009/01/17 13:28:52 mjf 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 int i, unit, cmaj, bmaj; 102 103 mutex_init(&sc->sc_mutex, MUTEX_DEFAULT, IPL_VM); 104 105 if ((sc->sc_flags & LDF_ENABLED) == 0) { 106 aprint_normal_dev(sc->sc_dv, "disabled\n"); 107 return; 108 } 109 110 /* Initialise and attach the disk structure. */ 111 disk_init(&sc->sc_dk, device_xname(sc->sc_dv), &lddkdriver); 112 disk_attach(&sc->sc_dk); 113 114 if (sc->sc_maxxfer > MAXPHYS) 115 sc->sc_maxxfer = MAXPHYS; 116 117 /* Build synthetic geometry if necessary. */ 118 if (sc->sc_nheads == 0 || sc->sc_nsectors == 0 || 119 sc->sc_ncylinders == 0) { 120 uint64_t ncyl; 121 122 if (sc->sc_secperunit <= 528 * 2048) /* 528MB */ 123 sc->sc_nheads = 16; 124 else if (sc->sc_secperunit <= 1024 * 2048) /* 1GB */ 125 sc->sc_nheads = 32; 126 else if (sc->sc_secperunit <= 21504 * 2048) /* 21GB */ 127 sc->sc_nheads = 64; 128 else if (sc->sc_secperunit <= 43008 * 2048) /* 42GB */ 129 sc->sc_nheads = 128; 130 else 131 sc->sc_nheads = 255; 132 133 sc->sc_nsectors = 63; 134 sc->sc_ncylinders = INT_MAX; 135 ncyl = sc->sc_secperunit / 136 (sc->sc_nheads * sc->sc_nsectors); 137 if (ncyl < INT_MAX) 138 sc->sc_ncylinders = (int)ncyl; 139 } 140 141 format_bytes(tbuf, sizeof(tbuf), sc->sc_secperunit * 142 sc->sc_secsize); 143 aprint_normal_dev(sc->sc_dv, "%s, %d cyl, %d head, %d sec, " 144 "%d bytes/sect x %"PRIu64" sectors\n", 145 tbuf, sc->sc_ncylinders, sc->sc_nheads, 146 sc->sc_nsectors, sc->sc_secsize, sc->sc_secperunit); 147 148 ld_set_properties(sc); 149 150 #if NRND > 0 151 /* Attach the device into the rnd source list. */ 152 rnd_attach_source(&sc->sc_rnd_source, device_xname(sc->sc_dv), 153 RND_TYPE_DISK, 0); 154 #endif 155 156 /* Register with PMF */ 157 if (!pmf_device_register1(sc->sc_dv, NULL, NULL, ld_shutdown)) 158 aprint_error_dev(sc->sc_dv, 159 "couldn't establish power handler\n"); 160 161 bufq_alloc(&sc->sc_bufq, BUFQ_DISK_DEFAULT_STRAT, BUFQ_SORT_RAWBLOCK); 162 163 /* Discover wedges on this disk. */ 164 config_interrupts(&sc->sc_dv, ld_config_interrupts); 165 166 cmaj = cdevsw_lookup_major(&ld_cdevsw); 167 bmaj = bdevsw_lookup_major(&ld_bdevsw); 168 unit = device_unit(&sc->sc_dv); 169 170 for (i = 0; i < MAXPARTITIONS; i++) { 171 device_register_name(MAKEDISKDEV(cmaj, unit, i), &sc->sc_dv, 172 true, DEV_DISK, "rld%d%c", unit, 'a' + i); 173 device_register_name(MAKEDISKDEV(bmaj, unit, i), &sc->sc_dv, 174 false, DEV_DISK, "ld%d%c", unit, 'a' + i); 175 } 176 177 } 178 179 int 180 ldadjqparam(struct ld_softc *sc, int xmax) 181 { 182 int s; 183 184 s = splbio(); 185 sc->sc_maxqueuecnt = xmax; 186 splx(s); 187 188 return (0); 189 } 190 191 int 192 ldbegindetach(struct ld_softc *sc, int flags) 193 { 194 int s, rv = 0; 195 196 if ((sc->sc_flags & LDF_ENABLED) == 0) 197 return (0); 198 199 if ((flags & DETACH_FORCE) == 0 && sc->sc_dk.dk_openmask != 0) 200 return (EBUSY); 201 202 s = splbio(); 203 sc->sc_maxqueuecnt = 0; 204 sc->sc_flags |= LDF_DETACH; 205 while (sc->sc_queuecnt > 0) { 206 sc->sc_flags |= LDF_DRAIN; 207 rv = tsleep(&sc->sc_queuecnt, PRIBIO, "lddrn", 0); 208 if (rv) 209 break; 210 } 211 splx(s); 212 213 return (rv); 214 } 215 216 void 217 ldenddetach(struct ld_softc *sc) 218 { 219 int s, bmaj, cmaj, i, mn; 220 221 if ((sc->sc_flags & LDF_ENABLED) == 0) 222 return; 223 224 /* Wait for commands queued with the hardware to complete. */ 225 if (sc->sc_queuecnt != 0) 226 if (tsleep(&sc->sc_queuecnt, PRIBIO, "lddtch", 30 * hz)) 227 printf("%s: not drained\n", device_xname(sc->sc_dv)); 228 229 device_deregister_all(&sc->sc_dv); 230 231 /* Locate the major numbers. */ 232 bmaj = bdevsw_lookup_major(&ld_bdevsw); 233 cmaj = cdevsw_lookup_major(&ld_cdevsw); 234 235 /* Kill off any queued buffers. */ 236 s = splbio(); 237 bufq_drain(sc->sc_bufq); 238 splx(s); 239 240 bufq_free(sc->sc_bufq); 241 242 /* Nuke the vnodes for any open instances. */ 243 for (i = 0; i < MAXPARTITIONS; i++) { 244 mn = DISKMINOR(device_unit(sc->sc_dv), i); 245 vdevgone(bmaj, mn, mn, VBLK); 246 vdevgone(cmaj, mn, mn, VCHR); 247 } 248 249 /* Delete all of our wedges. */ 250 dkwedge_delall(&sc->sc_dk); 251 252 /* Detach from the disk list. */ 253 disk_detach(&sc->sc_dk); 254 disk_destroy(&sc->sc_dk); 255 256 #if NRND > 0 257 /* Unhook the entropy source. */ 258 rnd_detach_source(&sc->sc_rnd_source); 259 #endif 260 261 /* Deregister with PMF */ 262 pmf_device_deregister(sc->sc_dv); 263 264 /* 265 * XXX We can't really flush the cache here, beceause the 266 * XXX device may already be non-existent from the controller's 267 * XXX perspective. 268 */ 269 #if 0 270 /* Flush the device's cache. */ 271 if (sc->sc_flush != NULL) 272 if ((*sc->sc_flush)(sc, 0) != 0) 273 aprint_error_dev(&sc->sc_dv, "unable to flush cache\n"); 274 #endif 275 mutex_destroy(&sc->sc_mutex); 276 } 277 278 /* ARGSUSED */ 279 static bool 280 ld_shutdown(device_t dev, int flags) 281 { 282 struct ld_softc *sc = device_private(dev); 283 284 if (sc->sc_flush != NULL && (*sc->sc_flush)(sc, LDFL_POLL) != 0) { 285 printf("%s: unable to flush cache\n", device_xname(dev)); 286 return false; 287 } 288 289 return true; 290 } 291 292 /* ARGSUSED */ 293 static int 294 ldopen(dev_t dev, int flags, int fmt, struct lwp *l) 295 { 296 struct ld_softc *sc; 297 int error, unit, part; 298 299 unit = DISKUNIT(dev); 300 if ((sc = device_lookup_private(&ld_cd, unit)) == NULL) 301 return (ENXIO); 302 if ((sc->sc_flags & LDF_ENABLED) == 0) 303 return (ENODEV); 304 part = DISKPART(dev); 305 306 mutex_enter(&sc->sc_dk.dk_openlock); 307 308 if (sc->sc_dk.dk_openmask == 0) { 309 /* Load the partition info if not already loaded. */ 310 if ((sc->sc_flags & LDF_VLABEL) == 0) 311 ldgetdisklabel(sc); 312 } 313 314 /* Check that the partition exists. */ 315 if (part != RAW_PART && (part >= sc->sc_dk.dk_label->d_npartitions || 316 sc->sc_dk.dk_label->d_partitions[part].p_fstype == FS_UNUSED)) { 317 error = ENXIO; 318 goto bad1; 319 } 320 321 /* Ensure only one open at a time. */ 322 switch (fmt) { 323 case S_IFCHR: 324 sc->sc_dk.dk_copenmask |= (1 << part); 325 break; 326 case S_IFBLK: 327 sc->sc_dk.dk_bopenmask |= (1 << part); 328 break; 329 } 330 sc->sc_dk.dk_openmask = 331 sc->sc_dk.dk_copenmask | sc->sc_dk.dk_bopenmask; 332 333 error = 0; 334 bad1: 335 mutex_exit(&sc->sc_dk.dk_openlock); 336 return (error); 337 } 338 339 /* ARGSUSED */ 340 static int 341 ldclose(dev_t dev, int flags, int fmt, struct lwp *l) 342 { 343 struct ld_softc *sc; 344 int part, unit; 345 346 unit = DISKUNIT(dev); 347 part = DISKPART(dev); 348 sc = device_lookup_private(&ld_cd, unit); 349 350 mutex_enter(&sc->sc_dk.dk_openlock); 351 352 switch (fmt) { 353 case S_IFCHR: 354 sc->sc_dk.dk_copenmask &= ~(1 << part); 355 break; 356 case S_IFBLK: 357 sc->sc_dk.dk_bopenmask &= ~(1 << part); 358 break; 359 } 360 sc->sc_dk.dk_openmask = 361 sc->sc_dk.dk_copenmask | sc->sc_dk.dk_bopenmask; 362 363 if (sc->sc_dk.dk_openmask == 0) { 364 if (sc->sc_flush != NULL && (*sc->sc_flush)(sc, 0) != 0) 365 aprint_error_dev(sc->sc_dv, "unable to flush cache\n"); 366 if ((sc->sc_flags & LDF_KLABEL) == 0) 367 sc->sc_flags &= ~LDF_VLABEL; 368 } 369 370 mutex_exit(&sc->sc_dk.dk_openlock); 371 return (0); 372 } 373 374 /* ARGSUSED */ 375 static int 376 ldread(dev_t dev, struct uio *uio, int ioflag) 377 { 378 379 return (physio(ldstrategy, NULL, dev, B_READ, ldminphys, uio)); 380 } 381 382 /* ARGSUSED */ 383 static int 384 ldwrite(dev_t dev, struct uio *uio, int ioflag) 385 { 386 387 return (physio(ldstrategy, NULL, dev, B_WRITE, ldminphys, uio)); 388 } 389 390 /* ARGSUSED */ 391 static int 392 ldioctl(dev_t dev, u_long cmd, void *addr, int32_t flag, struct lwp *l) 393 { 394 struct ld_softc *sc; 395 int part, unit, error; 396 #ifdef __HAVE_OLD_DISKLABEL 397 struct disklabel newlabel; 398 #endif 399 struct disklabel *lp; 400 401 unit = DISKUNIT(dev); 402 part = DISKPART(dev); 403 sc = device_lookup_private(&ld_cd, unit); 404 405 error = disk_ioctl(&sc->sc_dk, cmd, addr, flag, l); 406 if (error != EPASSTHROUGH) 407 return (error); 408 409 error = 0; 410 switch (cmd) { 411 case DIOCGDINFO: 412 memcpy(addr, sc->sc_dk.dk_label, sizeof(struct disklabel)); 413 return (0); 414 415 #ifdef __HAVE_OLD_DISKLABEL 416 case ODIOCGDINFO: 417 newlabel = *(sc->sc_dk.dk_label); 418 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 419 return ENOTTY; 420 memcpy(addr, &newlabel, sizeof(struct olddisklabel)); 421 return (0); 422 #endif 423 424 case DIOCGPART: 425 ((struct partinfo *)addr)->disklab = sc->sc_dk.dk_label; 426 ((struct partinfo *)addr)->part = 427 &sc->sc_dk.dk_label->d_partitions[part]; 428 break; 429 430 case DIOCWDINFO: 431 case DIOCSDINFO: 432 #ifdef __HAVE_OLD_DISKLABEL 433 case ODIOCWDINFO: 434 case ODIOCSDINFO: 435 436 if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) { 437 memset(&newlabel, 0, sizeof newlabel); 438 memcpy(&newlabel, addr, sizeof (struct olddisklabel)); 439 lp = &newlabel; 440 } else 441 #endif 442 lp = (struct disklabel *)addr; 443 444 if ((flag & FWRITE) == 0) 445 return (EBADF); 446 447 mutex_enter(&sc->sc_dk.dk_openlock); 448 sc->sc_flags |= LDF_LABELLING; 449 450 error = setdisklabel(sc->sc_dk.dk_label, 451 lp, /*sc->sc_dk.dk_openmask : */0, 452 sc->sc_dk.dk_cpulabel); 453 if (error == 0 && (cmd == DIOCWDINFO 454 #ifdef __HAVE_OLD_DISKLABEL 455 || cmd == ODIOCWDINFO 456 #endif 457 )) 458 error = writedisklabel( 459 MAKEDISKDEV(major(dev), DISKUNIT(dev), RAW_PART), 460 ldstrategy, sc->sc_dk.dk_label, 461 sc->sc_dk.dk_cpulabel); 462 463 sc->sc_flags &= ~LDF_LABELLING; 464 mutex_exit(&sc->sc_dk.dk_openlock); 465 break; 466 467 case DIOCKLABEL: 468 if ((flag & FWRITE) == 0) 469 return (EBADF); 470 if (*(int *)addr) 471 sc->sc_flags |= LDF_KLABEL; 472 else 473 sc->sc_flags &= ~LDF_KLABEL; 474 break; 475 476 case DIOCWLABEL: 477 if ((flag & FWRITE) == 0) 478 return (EBADF); 479 if (*(int *)addr) 480 sc->sc_flags |= LDF_WLABEL; 481 else 482 sc->sc_flags &= ~LDF_WLABEL; 483 break; 484 485 case DIOCGDEFLABEL: 486 ldgetdefaultlabel(sc, (struct disklabel *)addr); 487 break; 488 489 #ifdef __HAVE_OLD_DISKLABEL 490 case ODIOCGDEFLABEL: 491 ldgetdefaultlabel(sc, &newlabel); 492 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 493 return ENOTTY; 494 memcpy(addr, &newlabel, sizeof (struct olddisklabel)); 495 break; 496 #endif 497 498 case DIOCCACHESYNC: 499 /* 500 * XXX Do we really need to care about having a writable 501 * file descriptor here? 502 */ 503 if ((flag & FWRITE) == 0) 504 error = EBADF; 505 else if (sc->sc_flush) 506 error = (*sc->sc_flush)(sc, 0); 507 else 508 error = 0; /* XXX Error out instead? */ 509 break; 510 511 case DIOCAWEDGE: 512 { 513 struct dkwedge_info *dkw = (void *) addr; 514 515 if ((flag & FWRITE) == 0) 516 return (EBADF); 517 518 /* If the ioctl happens here, the parent is us. */ 519 strlcpy(dkw->dkw_parent, device_xname(sc->sc_dv), 520 sizeof(dkw->dkw_parent)); 521 return (dkwedge_add(dkw)); 522 } 523 524 case DIOCDWEDGE: 525 { 526 struct dkwedge_info *dkw = (void *) addr; 527 528 if ((flag & FWRITE) == 0) 529 return (EBADF); 530 531 /* If the ioctl happens here, the parent is us. */ 532 strlcpy(dkw->dkw_parent, device_xname(sc->sc_dv), 533 sizeof(dkw->dkw_parent)); 534 return (dkwedge_del(dkw)); 535 } 536 537 case DIOCLWEDGES: 538 { 539 struct dkwedge_list *dkwl = (void *) addr; 540 541 return (dkwedge_list(&sc->sc_dk, dkwl, l)); 542 } 543 case DIOCGSTRATEGY: 544 { 545 struct disk_strategy *dks = (void *)addr; 546 547 mutex_enter(&sc->sc_mutex); 548 strlcpy(dks->dks_name, bufq_getstrategyname(sc->sc_bufq), 549 sizeof(dks->dks_name)); 550 mutex_exit(&sc->sc_mutex); 551 dks->dks_paramlen = 0; 552 553 return 0; 554 } 555 case DIOCSSTRATEGY: 556 { 557 struct disk_strategy *dks = (void *)addr; 558 struct bufq_state *new, *old; 559 560 if ((flag & FWRITE) == 0) 561 return EPERM; 562 563 if (dks->dks_param != NULL) 564 return EINVAL; 565 566 dks->dks_name[sizeof(dks->dks_name) - 1] = 0; /* ensure term */ 567 error = bufq_alloc(&new, dks->dks_name, 568 BUFQ_EXACT|BUFQ_SORT_RAWBLOCK); 569 if (error) 570 return error; 571 572 mutex_enter(&sc->sc_mutex); 573 old = sc->sc_bufq; 574 bufq_move(new, old); 575 sc->sc_bufq = new; 576 mutex_exit(&sc->sc_mutex); 577 bufq_free(old); 578 579 return 0; 580 } 581 default: 582 error = ENOTTY; 583 break; 584 } 585 586 return (error); 587 } 588 589 static void 590 ldstrategy(struct buf *bp) 591 { 592 struct ld_softc *sc; 593 struct disklabel *lp; 594 daddr_t blkno; 595 int s, part; 596 597 sc = device_lookup_private(&ld_cd, DISKUNIT(bp->b_dev)); 598 part = DISKPART(bp->b_dev); 599 600 if ((sc->sc_flags & LDF_DETACH) != 0) { 601 bp->b_error = EIO; 602 goto done; 603 } 604 605 lp = sc->sc_dk.dk_label; 606 607 /* 608 * The transfer must be a whole number of blocks and the offset must 609 * not be negative. 610 */ 611 if ((bp->b_bcount % lp->d_secsize) != 0 || bp->b_blkno < 0) { 612 bp->b_error = EINVAL; 613 goto done; 614 } 615 616 /* If it's a null transfer, return immediately. */ 617 if (bp->b_bcount == 0) 618 goto done; 619 620 /* 621 * Do bounds checking and adjust the transfer. If error, process. 622 * If past the end of partition, just return. 623 */ 624 if (part != RAW_PART && 625 bounds_check_with_label(&sc->sc_dk, bp, 626 (sc->sc_flags & (LDF_WLABEL | LDF_LABELLING)) != 0) <= 0) { 627 goto done; 628 } 629 630 /* 631 * Convert the block number to absolute and put it in terms 632 * of the device's logical block size. 633 */ 634 if (lp->d_secsize == DEV_BSIZE) 635 blkno = bp->b_blkno; 636 else if (lp->d_secsize > DEV_BSIZE) 637 blkno = bp->b_blkno / (lp->d_secsize / DEV_BSIZE); 638 else 639 blkno = bp->b_blkno * (DEV_BSIZE / lp->d_secsize); 640 641 if (part != RAW_PART) 642 blkno += lp->d_partitions[part].p_offset; 643 644 bp->b_rawblkno = blkno; 645 646 s = splbio(); 647 ldstart(sc, bp); 648 splx(s); 649 return; 650 651 done: 652 bp->b_resid = bp->b_bcount; 653 biodone(bp); 654 } 655 656 static void 657 ldstart(struct ld_softc *sc, struct buf *bp) 658 { 659 int error; 660 661 mutex_enter(&sc->sc_mutex); 662 663 if (bp != NULL) 664 bufq_put(sc->sc_bufq, bp); 665 666 while (sc->sc_queuecnt < sc->sc_maxqueuecnt) { 667 /* See if there is work to do. */ 668 if ((bp = bufq_peek(sc->sc_bufq)) == NULL) 669 break; 670 671 disk_busy(&sc->sc_dk); 672 sc->sc_queuecnt++; 673 674 if (__predict_true((error = (*sc->sc_start)(sc, bp)) == 0)) { 675 /* 676 * The back-end is running the job; remove it from 677 * the queue. 678 */ 679 (void) bufq_get(sc->sc_bufq); 680 } else { 681 disk_unbusy(&sc->sc_dk, 0, (bp->b_flags & B_READ)); 682 sc->sc_queuecnt--; 683 if (error == EAGAIN) { 684 /* 685 * Temporary resource shortage in the 686 * back-end; just defer the job until 687 * later. 688 * 689 * XXX We might consider a watchdog timer 690 * XXX to make sure we are kicked into action. 691 */ 692 break; 693 } else { 694 (void) bufq_get(sc->sc_bufq); 695 bp->b_error = error; 696 bp->b_resid = bp->b_bcount; 697 mutex_exit(&sc->sc_mutex); 698 biodone(bp); 699 mutex_enter(&sc->sc_mutex); 700 } 701 } 702 } 703 704 mutex_exit(&sc->sc_mutex); 705 } 706 707 void 708 lddone(struct ld_softc *sc, struct buf *bp) 709 { 710 711 if (bp->b_error != 0) { 712 diskerr(bp, "ld", "error", LOG_PRINTF, 0, sc->sc_dk.dk_label); 713 printf("\n"); 714 } 715 716 disk_unbusy(&sc->sc_dk, bp->b_bcount - bp->b_resid, 717 (bp->b_flags & B_READ)); 718 #if NRND > 0 719 rnd_add_uint32(&sc->sc_rnd_source, bp->b_rawblkno); 720 #endif 721 biodone(bp); 722 723 mutex_enter(&sc->sc_mutex); 724 if (--sc->sc_queuecnt <= sc->sc_maxqueuecnt) { 725 if ((sc->sc_flags & LDF_DRAIN) != 0) { 726 sc->sc_flags &= ~LDF_DRAIN; 727 wakeup(&sc->sc_queuecnt); 728 } 729 mutex_exit(&sc->sc_mutex); 730 ldstart(sc, NULL); 731 } else 732 mutex_exit(&sc->sc_mutex); 733 } 734 735 static int 736 ldsize(dev_t dev) 737 { 738 struct ld_softc *sc; 739 int part, unit, omask, size; 740 741 unit = DISKUNIT(dev); 742 if ((sc = device_lookup_private(&ld_cd, unit)) == NULL) 743 return (ENODEV); 744 if ((sc->sc_flags & LDF_ENABLED) == 0) 745 return (ENODEV); 746 part = DISKPART(dev); 747 748 omask = sc->sc_dk.dk_openmask & (1 << part); 749 750 if (omask == 0 && ldopen(dev, 0, S_IFBLK, NULL) != 0) 751 return (-1); 752 else if (sc->sc_dk.dk_label->d_partitions[part].p_fstype != FS_SWAP) 753 size = -1; 754 else 755 size = sc->sc_dk.dk_label->d_partitions[part].p_size * 756 (sc->sc_dk.dk_label->d_secsize / DEV_BSIZE); 757 if (omask == 0 && ldclose(dev, 0, S_IFBLK, NULL) != 0) 758 return (-1); 759 760 return (size); 761 } 762 763 /* 764 * Load the label information from the specified device. 765 */ 766 static void 767 ldgetdisklabel(struct ld_softc *sc) 768 { 769 const char *errstring; 770 771 ldgetdefaultlabel(sc, sc->sc_dk.dk_label); 772 773 /* Call the generic disklabel extraction routine. */ 774 errstring = readdisklabel(MAKEDISKDEV(0, device_unit(sc->sc_dv), 775 RAW_PART), ldstrategy, sc->sc_dk.dk_label, sc->sc_dk.dk_cpulabel); 776 if (errstring != NULL) 777 printf("%s: %s\n", device_xname(sc->sc_dv), errstring); 778 779 /* In-core label now valid. */ 780 sc->sc_flags |= LDF_VLABEL; 781 } 782 783 /* 784 * Construct a ficticious label. 785 */ 786 static void 787 ldgetdefaultlabel(struct ld_softc *sc, struct disklabel *lp) 788 { 789 790 memset(lp, 0, sizeof(struct disklabel)); 791 792 lp->d_secsize = sc->sc_secsize; 793 lp->d_ntracks = sc->sc_nheads; 794 lp->d_nsectors = sc->sc_nsectors; 795 lp->d_ncylinders = sc->sc_ncylinders; 796 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 797 lp->d_type = DTYPE_LD; 798 strlcpy(lp->d_typename, "unknown", sizeof(lp->d_typename)); 799 strlcpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); 800 lp->d_secperunit = sc->sc_secperunit; 801 lp->d_rpm = 7200; 802 lp->d_interleave = 1; 803 lp->d_flags = 0; 804 805 lp->d_partitions[RAW_PART].p_offset = 0; 806 lp->d_partitions[RAW_PART].p_size = 807 lp->d_secperunit * (lp->d_secsize / DEV_BSIZE); 808 lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED; 809 lp->d_npartitions = RAW_PART + 1; 810 811 lp->d_magic = DISKMAGIC; 812 lp->d_magic2 = DISKMAGIC; 813 lp->d_checksum = dkcksum(lp); 814 } 815 816 /* 817 * Take a dump. 818 */ 819 static int 820 lddump(dev_t dev, daddr_t blkno, void *vav, size_t size) 821 { 822 char *va = vav; 823 struct ld_softc *sc; 824 struct disklabel *lp; 825 int unit, part, nsects, sectoff, towrt, nblk, maxblkcnt, rv; 826 static int dumping; 827 828 unit = DISKUNIT(dev); 829 if ((sc = device_lookup_private(&ld_cd, unit)) == NULL) 830 return (ENXIO); 831 if ((sc->sc_flags & LDF_ENABLED) == 0) 832 return (ENODEV); 833 if (sc->sc_dump == NULL) 834 return (ENXIO); 835 836 /* Check if recursive dump; if so, punt. */ 837 if (dumping) 838 return (EFAULT); 839 dumping = 1; 840 841 /* Convert to disk sectors. Request must be a multiple of size. */ 842 part = DISKPART(dev); 843 lp = sc->sc_dk.dk_label; 844 if ((size % lp->d_secsize) != 0) 845 return (EFAULT); 846 towrt = size / lp->d_secsize; 847 blkno = dbtob(blkno) / lp->d_secsize; /* blkno in DEV_BSIZE units */ 848 849 nsects = lp->d_partitions[part].p_size; 850 sectoff = lp->d_partitions[part].p_offset; 851 852 /* Check transfer bounds against partition size. */ 853 if ((blkno < 0) || ((blkno + towrt) > nsects)) 854 return (EINVAL); 855 856 /* Offset block number to start of partition. */ 857 blkno += sectoff; 858 859 /* Start dumping and return when done. */ 860 maxblkcnt = sc->sc_maxxfer / sc->sc_secsize - 1; 861 while (towrt > 0) { 862 nblk = min(maxblkcnt, towrt); 863 864 if ((rv = (*sc->sc_dump)(sc, va, blkno, nblk)) != 0) 865 return (rv); 866 867 towrt -= nblk; 868 blkno += nblk; 869 va += nblk * sc->sc_secsize; 870 } 871 872 dumping = 0; 873 return (0); 874 } 875 876 /* 877 * Adjust the size of a transfer. 878 */ 879 static void 880 ldminphys(struct buf *bp) 881 { 882 struct ld_softc *sc; 883 884 sc = device_lookup_private(&ld_cd, DISKUNIT(bp->b_dev)); 885 886 if (bp->b_bcount > sc->sc_maxxfer) 887 bp->b_bcount = sc->sc_maxxfer; 888 minphys(bp); 889 } 890 891 static void 892 ld_set_properties(struct ld_softc *ld) 893 { 894 prop_dictionary_t disk_info, odisk_info, geom; 895 896 disk_info = prop_dictionary_create(); 897 898 geom = prop_dictionary_create(); 899 900 prop_dictionary_set_uint64(geom, "sectors-per-unit", 901 ld->sc_secperunit); 902 903 prop_dictionary_set_uint32(geom, "sector-size", 904 ld->sc_secsize); 905 906 prop_dictionary_set_uint16(geom, "sectors-per-track", 907 ld->sc_nsectors); 908 909 prop_dictionary_set_uint16(geom, "tracks-per-cylinder", 910 ld->sc_nheads); 911 912 prop_dictionary_set_uint64(geom, "cylinders-per-unit", 913 ld->sc_ncylinders); 914 915 prop_dictionary_set(disk_info, "geometry", geom); 916 prop_object_release(geom); 917 918 prop_dictionary_set(device_properties(ld->sc_dv), 919 "disk-info", disk_info); 920 921 /* 922 * Don't release disk_info here; we keep a reference to it. 923 * disk_detach() will release it when we go away. 924 */ 925 926 odisk_info = ld->sc_dk.dk_info; 927 ld->sc_dk.dk_info = disk_info; 928 if (odisk_info) 929 prop_object_release(odisk_info); 930 } 931 932 static void 933 ld_config_interrupts (struct device *d) 934 { 935 struct ld_softc *sc = device_private(d); 936 dkwedge_discover(&sc->sc_dk); 937 } 938
Indexes created Sat Oct 25 16:10:12 GMT 2025