1 /* $NetBSD: ld.c,v 1.117 2025/04/13 14:00:59 jakllsch 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 1.117 2025/04/13 14:00:59 jakllsch Exp $"); 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/kernel.h> 42 #include <sys/device.h> 43 #include <sys/queue.h> 44 #include <sys/proc.h> 45 #include <sys/buf.h> 46 #include <sys/bufq.h> 47 #include <sys/endian.h> 48 #include <sys/disklabel.h> 49 #include <sys/disk.h> 50 #include <sys/dkio.h> 51 #include <sys/stat.h> 52 #include <sys/conf.h> 53 #include <sys/fcntl.h> 54 #include <sys/vnode.h> 55 #include <sys/syslog.h> 56 #include <sys/mutex.h> 57 #include <sys/module.h> 58 #include <sys/reboot.h> 59 60 #include <dev/ldvar.h> 61 62 #include "ioconf.h" 63 64 static void ldminphys(struct buf *bp); 65 static bool ld_suspend(device_t, const pmf_qual_t *); 66 static bool ld_resume(device_t, const pmf_qual_t *); 67 static bool ld_shutdown(device_t, int); 68 static int ld_diskstart(device_t, struct buf *bp); 69 static void ld_iosize(device_t, int *); 70 static int ld_dumpblocks(device_t, void *, daddr_t, int); 71 static void ld_fake_geometry(struct ld_softc *); 72 static void ld_set_geometry(struct ld_softc *); 73 static void ld_config_interrupts (device_t); 74 static int ld_lastclose(device_t); 75 static int ld_discard(device_t, off_t, off_t); 76 static int ld_flush(device_t, bool); 77 78 static dev_type_open(ldopen); 79 static dev_type_close(ldclose); 80 static dev_type_read(ldread); 81 static dev_type_write(ldwrite); 82 static dev_type_ioctl(ldioctl); 83 static dev_type_strategy(ldstrategy); 84 static dev_type_dump(lddump); 85 static dev_type_size(ldsize); 86 static dev_type_discard(lddiscard); 87 88 const struct bdevsw ld_bdevsw = { 89 .d_open = ldopen, 90 .d_close = ldclose, 91 .d_strategy = ldstrategy, 92 .d_ioctl = ldioctl, 93 .d_dump = lddump, 94 .d_psize = ldsize, 95 .d_discard = lddiscard, 96 .d_flag = D_DISK | D_MPSAFE 97 }; 98 99 const struct cdevsw ld_cdevsw = { 100 .d_open = ldopen, 101 .d_close = ldclose, 102 .d_read = ldread, 103 .d_write = ldwrite, 104 .d_ioctl = ldioctl, 105 .d_stop = nostop, 106 .d_tty = notty, 107 .d_poll = nopoll, 108 .d_mmap = nommap, 109 .d_kqfilter = nokqfilter, 110 .d_discard = lddiscard, 111 .d_flag = D_DISK | D_MPSAFE 112 }; 113 114 static const struct dkdriver lddkdriver = { 115 .d_open = ldopen, 116 .d_close = ldclose, 117 .d_strategy = ldstrategy, 118 .d_iosize = ld_iosize, 119 .d_minphys = ldminphys, 120 .d_diskstart = ld_diskstart, 121 .d_dumpblocks = ld_dumpblocks, 122 .d_lastclose = ld_lastclose, 123 .d_discard = ld_discard 124 }; 125 126 void 127 ldattach(struct ld_softc *sc, const char *default_strategy) 128 { 129 device_t self = sc->sc_dv; 130 struct dk_softc *dksc = &sc->sc_dksc; 131 132 mutex_init(&sc->sc_mutex, MUTEX_DEFAULT, IPL_VM); 133 cv_init(&sc->sc_drain, "lddrain"); 134 135 if ((sc->sc_flags & LDF_ENABLED) == 0) { 136 return; 137 } 138 139 /* don't attach a disk that we cannot handle */ 140 if (sc->sc_secsize < DEV_BSIZE) { 141 sc->sc_flags &= ~LDF_ENABLED; 142 return; 143 } 144 145 /* Initialise dk and disk structure. */ 146 dk_init(dksc, self, DKTYPE_LD); 147 disk_init(&dksc->sc_dkdev, dksc->sc_xname, &lddkdriver); 148 149 if (sc->sc_maxxfer > MAXPHYS) 150 sc->sc_maxxfer = MAXPHYS; 151 152 /* Build synthetic geometry if necessary. */ 153 if (sc->sc_nheads == 0 || sc->sc_nsectors == 0 || 154 sc->sc_ncylinders == 0) 155 ld_fake_geometry(sc); 156 157 sc->sc_disksize512 = sc->sc_secperunit * sc->sc_secsize / DEV_BSIZE; 158 159 if (sc->sc_flags & LDF_NO_RND) 160 dksc->sc_flags |= DKF_NO_RND; 161 162 /* Attach dk and disk subsystems */ 163 dk_attach(dksc); 164 disk_attach(&dksc->sc_dkdev); 165 ld_set_geometry(sc); 166 167 bufq_alloc(&dksc->sc_bufq, default_strategy, BUFQ_SORT_RAWBLOCK); 168 169 /* Register with PMF */ 170 if (!pmf_device_register1(dksc->sc_dev, ld_suspend, ld_resume, 171 ld_shutdown)) 172 aprint_error_dev(dksc->sc_dev, 173 "couldn't establish power handler\n"); 174 175 /* Discover wedges on this disk. */ 176 config_interrupts(sc->sc_dv, ld_config_interrupts); 177 } 178 179 int 180 ldadjqparam(struct ld_softc *sc, int xmax) 181 { 182 183 mutex_enter(&sc->sc_mutex); 184 sc->sc_maxqueuecnt = xmax; 185 mutex_exit(&sc->sc_mutex); 186 187 return (0); 188 } 189 190 int 191 ldbegindetach(struct ld_softc *sc, int flags) 192 { 193 struct dk_softc *dksc = &sc->sc_dksc; 194 int error; 195 196 /* If we never attached properly, no problem with detaching. */ 197 if ((sc->sc_flags & LDF_ENABLED) == 0) 198 return 0; 199 200 /* 201 * If the disk is still open, back out before we commit to 202 * detaching. 203 */ 204 error = disk_begindetach(&dksc->sc_dkdev, ld_lastclose, dksc->sc_dev, 205 flags); 206 if (error) 207 return error; 208 209 /* We are now committed to detaching. Prevent new xfers. */ 210 ldadjqparam(sc, 0); 211 212 return 0; 213 } 214 215 void 216 ldenddetach(struct ld_softc *sc) 217 { 218 struct dk_softc *dksc = &sc->sc_dksc; 219 int 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 mutex_enter(&sc->sc_mutex); 226 while (sc->sc_queuecnt > 0) { 227 if (cv_timedwait(&sc->sc_drain, &sc->sc_mutex, 30 * hz)) { 228 /* 229 * XXX This seems like a recipe for crashing on 230 * use after free... 231 */ 232 printf("%s: not drained\n", dksc->sc_xname); 233 break; 234 } 235 } 236 mutex_exit(&sc->sc_mutex); 237 238 /* Kill off any queued buffers. */ 239 dk_drain(dksc); 240 bufq_free(dksc->sc_bufq); 241 242 /* Locate the major numbers. */ 243 bmaj = bdevsw_lookup_major(&ld_bdevsw); 244 cmaj = cdevsw_lookup_major(&ld_cdevsw); 245 246 /* Nuke the vnodes for any open instances. */ 247 for (i = 0; i < MAXPARTITIONS; i++) { 248 mn = DISKMINOR(device_unit(dksc->sc_dev), i); 249 vdevgone(bmaj, mn, mn, VBLK); 250 vdevgone(cmaj, mn, mn, VCHR); 251 } 252 253 /* Delete all of our wedges. */ 254 dkwedge_delall(&dksc->sc_dkdev); 255 256 /* Detach from the disk list. */ 257 disk_detach(&dksc->sc_dkdev); 258 disk_destroy(&dksc->sc_dkdev); 259 260 dk_detach(dksc); 261 262 /* Deregister with PMF */ 263 pmf_device_deregister(dksc->sc_dev); 264 265 /* 266 * XXX We can't really flush the cache here, because the 267 * XXX device may already be non-existent from the controller's 268 * XXX perspective. 269 */ 270 #if 0 271 ld_flush(dksc->sc_dev, false); 272 #endif 273 cv_destroy(&sc->sc_drain); 274 mutex_destroy(&sc->sc_mutex); 275 } 276 277 /* ARGSUSED */ 278 static bool 279 ld_suspend(device_t dev, const pmf_qual_t *qual) 280 { 281 struct ld_softc *sc = device_private(dev); 282 int queuecnt; 283 bool ok = false; 284 285 /* Block new requests and wait for outstanding requests to drain. */ 286 mutex_enter(&sc->sc_mutex); 287 KASSERT((sc->sc_flags & LDF_SUSPEND) == 0); 288 sc->sc_flags |= LDF_SUSPEND; 289 while ((queuecnt = sc->sc_queuecnt) > 0) { 290 if (cv_timedwait(&sc->sc_drain, &sc->sc_mutex, 30 * hz)) 291 break; 292 } 293 mutex_exit(&sc->sc_mutex); 294 295 /* Block suspend if we couldn't drain everything in 30sec. */ 296 if (queuecnt > 0) { 297 device_printf(dev, "timeout draining buffers\n"); 298 goto out; 299 } 300 301 /* Flush cache before we lose power. If we can't, block suspend. */ 302 if (ld_flush(dev, /*poll*/false) != 0) { 303 device_printf(dev, "failed to flush cache\n"); 304 goto out; 305 } 306 307 /* Success! */ 308 ok = true; 309 310 out: if (!ok) 311 (void)ld_resume(dev, qual); 312 return ok; 313 } 314 315 static bool 316 ld_resume(device_t dev, const pmf_qual_t *qual) 317 { 318 struct ld_softc *sc = device_private(dev); 319 320 /* Allow new requests to come in. */ 321 mutex_enter(&sc->sc_mutex); 322 KASSERT(sc->sc_flags & LDF_SUSPEND); 323 sc->sc_flags &= ~LDF_SUSPEND; 324 mutex_exit(&sc->sc_mutex); 325 326 /* Restart any pending queued requests. */ 327 dk_start(&sc->sc_dksc, NULL); 328 329 return true; 330 } 331 332 /* ARGSUSED */ 333 static bool 334 ld_shutdown(device_t dev, int flags) 335 { 336 if ((flags & RB_NOSYNC) == 0 && ld_flush(dev, true) != 0) 337 return false; 338 339 return true; 340 } 341 342 /* ARGSUSED */ 343 static int 344 ldopen(dev_t dev, int flags, int fmt, struct lwp *l) 345 { 346 struct ld_softc *sc; 347 struct dk_softc *dksc; 348 int unit; 349 350 unit = DISKUNIT(dev); 351 if ((sc = device_lookup_private(&ld_cd, unit)) == NULL) 352 return (ENXIO); 353 354 if ((sc->sc_flags & LDF_ENABLED) == 0) 355 return (ENODEV); 356 357 dksc = &sc->sc_dksc; 358 359 return dk_open(dksc, dev, flags, fmt, l); 360 } 361 362 static int 363 ld_lastclose(device_t self) 364 { 365 ld_flush(self, false); 366 367 return 0; 368 } 369 370 /* ARGSUSED */ 371 static int 372 ldclose(dev_t dev, int flags, int fmt, struct lwp *l) 373 { 374 struct ld_softc *sc; 375 struct dk_softc *dksc; 376 int unit; 377 378 unit = DISKUNIT(dev); 379 sc = device_lookup_private(&ld_cd, unit); 380 dksc = &sc->sc_dksc; 381 382 return dk_close(dksc, dev, flags, fmt, l); 383 } 384 385 /* ARGSUSED */ 386 static int 387 ldread(dev_t dev, struct uio *uio, int ioflag) 388 { 389 390 return (physio(ldstrategy, NULL, dev, B_READ, ldminphys, uio)); 391 } 392 393 /* ARGSUSED */ 394 static int 395 ldwrite(dev_t dev, struct uio *uio, int ioflag) 396 { 397 398 return (physio(ldstrategy, NULL, dev, B_WRITE, ldminphys, uio)); 399 } 400 401 /* ARGSUSED */ 402 static int 403 ldioctl(dev_t dev, u_long cmd, void *addr, int32_t flag, struct lwp *l) 404 { 405 struct ld_softc *sc; 406 struct dk_softc *dksc; 407 int unit, error; 408 409 unit = DISKUNIT(dev); 410 sc = device_lookup_private(&ld_cd, unit); 411 dksc = &sc->sc_dksc; 412 413 error = 0; 414 415 /* 416 * Some common checks so that individual attachments wouldn't need 417 * to duplicate them. 418 */ 419 switch (cmd) { 420 case DIOCCACHESYNC: 421 /* 422 * XXX Do we really need to care about having a writable 423 * file descriptor here? 424 */ 425 if ((flag & FWRITE) == 0) 426 error = EBADF; 427 else 428 error = 0; 429 break; 430 } 431 432 if (error != 0) 433 return (error); 434 435 if (sc->sc_ioctl) { 436 if ((sc->sc_flags & LDF_MPSAFE) == 0) 437 KERNEL_LOCK(1, curlwp); 438 error = (*sc->sc_ioctl)(sc, cmd, addr, flag, 0); 439 if ((sc->sc_flags & LDF_MPSAFE) == 0) 440 KERNEL_UNLOCK_ONE(curlwp); 441 if (error != EPASSTHROUGH) 442 return (error); 443 } 444 445 /* something not handled by the attachment */ 446 return dk_ioctl(dksc, dev, cmd, addr, flag, l); 447 } 448 449 /* 450 * Flush the device's cache. 451 */ 452 static int 453 ld_flush(device_t self, bool poll) 454 { 455 int error = 0; 456 struct ld_softc *sc = device_private(self); 457 458 if (sc->sc_ioctl) { 459 if ((sc->sc_flags & LDF_MPSAFE) == 0) 460 KERNEL_LOCK(1, curlwp); 461 error = (*sc->sc_ioctl)(sc, DIOCCACHESYNC, NULL, 0, poll); 462 if ((sc->sc_flags & LDF_MPSAFE) == 0) 463 KERNEL_UNLOCK_ONE(curlwp); 464 if (error != 0) 465 device_printf(self, "unable to flush cache\n"); 466 } 467 468 return error; 469 } 470 471 static void 472 ldstrategy(struct buf *bp) 473 { 474 struct ld_softc *sc; 475 struct dk_softc *dksc; 476 int unit; 477 478 unit = DISKUNIT(bp->b_dev); 479 sc = device_lookup_private(&ld_cd, unit); 480 dksc = &sc->sc_dksc; 481 482 dk_strategy(dksc, bp); 483 } 484 485 static int 486 ld_diskstart(device_t dev, struct buf *bp) 487 { 488 struct ld_softc *sc = device_private(dev); 489 int error; 490 491 if (sc->sc_queuecnt >= sc->sc_maxqueuecnt || 492 sc->sc_flags & LDF_SUSPEND) { 493 if (sc->sc_flags & LDF_SUSPEND) 494 aprint_debug_dev(dev, "i/o blocked while suspended\n"); 495 return EAGAIN; 496 } 497 498 if ((sc->sc_flags & LDF_MPSAFE) == 0) 499 KERNEL_LOCK(1, curlwp); 500 501 mutex_enter(&sc->sc_mutex); 502 503 if (sc->sc_queuecnt >= sc->sc_maxqueuecnt || 504 sc->sc_flags & LDF_SUSPEND) { 505 if (sc->sc_flags & LDF_SUSPEND) 506 aprint_debug_dev(dev, "i/o blocked while suspended\n"); 507 error = EAGAIN; 508 } else { 509 error = (*sc->sc_start)(sc, bp); 510 if (error == 0) 511 sc->sc_queuecnt++; 512 } 513 514 mutex_exit(&sc->sc_mutex); 515 516 if ((sc->sc_flags & LDF_MPSAFE) == 0) 517 KERNEL_UNLOCK_ONE(curlwp); 518 519 return error; 520 } 521 522 void 523 lddone(struct ld_softc *sc, struct buf *bp) 524 { 525 struct dk_softc *dksc = &sc->sc_dksc; 526 527 dk_done(dksc, bp); 528 529 mutex_enter(&sc->sc_mutex); 530 if (--sc->sc_queuecnt <= sc->sc_maxqueuecnt) { 531 cv_broadcast(&sc->sc_drain); 532 mutex_exit(&sc->sc_mutex); 533 dk_start(dksc, NULL); 534 } else 535 mutex_exit(&sc->sc_mutex); 536 } 537 538 static int 539 ldsize(dev_t dev) 540 { 541 struct ld_softc *sc; 542 struct dk_softc *dksc; 543 int unit; 544 545 unit = DISKUNIT(dev); 546 if ((sc = device_lookup_private(&ld_cd, unit)) == NULL) 547 return (-1); 548 dksc = &sc->sc_dksc; 549 550 if ((sc->sc_flags & LDF_ENABLED) == 0) 551 return (-1); 552 553 return dk_size(dksc, dev); 554 } 555 556 /* 557 * Take a dump. 558 */ 559 static int 560 lddump(dev_t dev, daddr_t blkno, void *va, size_t size) 561 { 562 struct ld_softc *sc; 563 struct dk_softc *dksc; 564 int unit; 565 566 unit = DISKUNIT(dev); 567 if ((sc = device_lookup_private(&ld_cd, unit)) == NULL) 568 return (ENXIO); 569 dksc = &sc->sc_dksc; 570 571 if ((sc->sc_flags & LDF_ENABLED) == 0) 572 return (ENODEV); 573 574 return dk_dump(dksc, dev, blkno, va, size, 0); 575 } 576 577 static int 578 ld_dumpblocks(device_t dev, void *va, daddr_t blkno, int nblk) 579 { 580 struct ld_softc *sc = device_private(dev); 581 582 if (sc->sc_dump == NULL) 583 return (ENODEV); 584 585 /* 586 * Minimum consistency check; sc_dump() should check 587 * device-dependent constraints if necessary. 588 */ 589 if (blkno < 0) 590 return (EIO); 591 592 return (*sc->sc_dump)(sc, va, blkno, nblk); 593 } 594 595 /* 596 * Adjust the size of a transfer. 597 */ 598 static void 599 ldminphys(struct buf *bp) 600 { 601 int unit; 602 struct ld_softc *sc; 603 604 unit = DISKUNIT(bp->b_dev); 605 sc = device_lookup_private(&ld_cd, unit); 606 607 ld_iosize(sc->sc_dv, &bp->b_bcount); 608 minphys(bp); 609 } 610 611 static void 612 ld_iosize(device_t d, int *countp) 613 { 614 struct ld_softc *sc = device_private(d); 615 616 if (*countp > sc->sc_maxxfer) 617 *countp = sc->sc_maxxfer; 618 } 619 620 static void 621 ld_fake_geometry(struct ld_softc *sc) 622 { 623 uint64_t ncyl; 624 625 if (sc->sc_secperunit <= 528 * 2048) /* 528MB */ 626 sc->sc_nheads = 16; 627 else if (sc->sc_secperunit <= 1024 * 2048) /* 1GB */ 628 sc->sc_nheads = 32; 629 else if (sc->sc_secperunit <= 21504 * 2048) /* 21GB */ 630 sc->sc_nheads = 64; 631 else if (sc->sc_secperunit <= 43008 * 2048) /* 42GB */ 632 sc->sc_nheads = 128; 633 else 634 sc->sc_nheads = 255; 635 636 sc->sc_nsectors = 63; 637 sc->sc_ncylinders = INT_MAX; 638 ncyl = sc->sc_secperunit / 639 (sc->sc_nheads * sc->sc_nsectors); 640 if (ncyl < INT_MAX) 641 sc->sc_ncylinders = (int)ncyl; 642 } 643 644 static void 645 ld_set_geometry(struct ld_softc *sc) 646 { 647 struct dk_softc *dksc = &sc->sc_dksc; 648 struct disk_geom *dg = &dksc->sc_dkdev.dk_geom; 649 char tbuf[9]; 650 651 format_bytes(tbuf, sizeof(tbuf), sc->sc_secperunit * 652 sc->sc_secsize); 653 aprint_normal_dev(dksc->sc_dev, "%s, %d cyl, %d head, %d sec, " 654 "%d bytes/sect x %"PRIu64" sectors", 655 tbuf, sc->sc_ncylinders, sc->sc_nheads, 656 sc->sc_nsectors, sc->sc_secsize, sc->sc_secperunit); 657 if (sc->sc_physsecsize != sc->sc_secsize) { 658 aprint_normal(" (%d bytes/physsect", sc->sc_physsecsize); 659 if (sc->sc_alignedsec != 0) 660 aprint_normal("; first aligned sector %u", 661 sc->sc_alignedsec); 662 aprint_normal(")"); 663 } 664 aprint_normal("\n"); 665 666 memset(dg, 0, sizeof(*dg)); 667 dg->dg_secperunit = sc->sc_secperunit; 668 dg->dg_secsize = sc->sc_secsize; 669 dg->dg_nsectors = sc->sc_nsectors; 670 dg->dg_ntracks = sc->sc_nheads; 671 dg->dg_ncylinders = sc->sc_ncylinders; 672 dg->dg_physsecsize = sc->sc_physsecsize; 673 dg->dg_alignedsec = sc->sc_alignedsec; 674 675 disk_set_info(dksc->sc_dev, &dksc->sc_dkdev, sc->sc_typename); 676 } 677 678 static void 679 ld_config_interrupts(device_t d) 680 { 681 struct ld_softc *sc = device_private(d); 682 struct dk_softc *dksc = &sc->sc_dksc; 683 684 dkwedge_discover(&dksc->sc_dkdev); 685 } 686 687 static int 688 ld_discard(device_t dev, off_t pos, off_t len) 689 { 690 struct ld_softc *sc = device_private(dev); 691 struct buf dbuf, *bp = &dbuf; 692 int error = 0; 693 694 KASSERT(len <= INT_MAX); 695 696 if (sc->sc_discard == NULL) 697 return (ENODEV); 698 699 if ((sc->sc_flags & LDF_MPSAFE) == 0) 700 KERNEL_LOCK(1, curlwp); 701 702 buf_init(bp); 703 bp->b_vp = NULL; 704 bp->b_data = NULL; 705 bp->b_bufsize = 0; 706 bp->b_rawblkno = pos / sc->sc_secsize; 707 bp->b_bcount = len; 708 bp->b_flags = B_WRITE; 709 bp->b_cflags = BC_BUSY; 710 711 error = (*sc->sc_discard)(sc, bp); 712 if (error == 0) 713 error = biowait(bp); 714 715 buf_destroy(bp); 716 717 if ((sc->sc_flags & LDF_MPSAFE) == 0) 718 KERNEL_UNLOCK_ONE(curlwp); 719 720 return error; 721 } 722 723 void 724 lddiscardend(struct ld_softc *sc, struct buf *bp) 725 { 726 727 if (bp->b_error) 728 bp->b_resid = bp->b_bcount; 729 biodone(bp); 730 } 731 732 static int 733 lddiscard(dev_t dev, off_t pos, off_t len) 734 { 735 struct ld_softc *sc; 736 struct dk_softc *dksc; 737 int unit; 738 739 unit = DISKUNIT(dev); 740 sc = device_lookup_private(&ld_cd, unit); 741 dksc = &sc->sc_dksc; 742 743 return dk_discard(dksc, dev, pos, len); 744 } 745 746 MODULE(MODULE_CLASS_DRIVER, ld, "dk_subr"); 747 748 #ifdef _MODULE 749 CFDRIVER_DECL(ld, DV_DISK, NULL); 750 #endif 751 752 static int 753 ld_modcmd(modcmd_t cmd, void *opaque) 754 { 755 #ifdef _MODULE 756 devmajor_t bmajor, cmajor; 757 #endif 758 int error = 0; 759 760 #ifdef _MODULE 761 switch (cmd) { 762 case MODULE_CMD_INIT: 763 bmajor = cmajor = -1; 764 error = devsw_attach(ld_cd.cd_name, &ld_bdevsw, &bmajor, 765 &ld_cdevsw, &cmajor); 766 if (error) 767 break; 768 error = config_cfdriver_attach(&ld_cd); 769 break; 770 case MODULE_CMD_FINI: 771 error = config_cfdriver_detach(&ld_cd); 772 if (error) 773 break; 774 devsw_detach(&ld_bdevsw, &ld_cdevsw); 775 break; 776 default: 777 error = ENOTTY; 778 break; 779 } 780 #endif 781 782 return error; 783 } 784
Indexes created Sat Sep 20 22:09:52 GMT 2025