ld.c revision 1.49
1 /* $NetBSD: ld.c,v 1.49 2007/07/29 12:50:18 ad 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Disk driver for use by RAID controllers. 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: ld.c,v 1.49 2007/07/29 12:50:18 ad Exp $"); 45 46 #include "rnd.h" 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/kernel.h> 51 #include <sys/device.h> 52 #include <sys/queue.h> 53 #include <sys/proc.h> 54 #include <sys/buf.h> 55 #include <sys/bufq.h> 56 #include <sys/endian.h> 57 #include <sys/disklabel.h> 58 #include <sys/disk.h> 59 #include <sys/dkio.h> 60 #include <sys/stat.h> 61 #include <sys/lock.h> 62 #include <sys/conf.h> 63 #include <sys/fcntl.h> 64 #include <sys/vnode.h> 65 #include <sys/syslog.h> 66 #include <sys/mutex.h> 67 #if NRND > 0 68 #include <sys/rnd.h> 69 #endif 70 71 #include <dev/ldvar.h> 72 73 #include <prop/proplib.h> 74 75 static void ldgetdefaultlabel(struct ld_softc *, struct disklabel *); 76 static void ldgetdisklabel(struct ld_softc *); 77 static void ldminphys(struct buf *bp); 78 static void ldshutdown(void *); 79 static void ldstart(struct ld_softc *, struct buf *); 80 static void ld_set_properties(struct ld_softc *); 81 static void ld_config_interrupts (struct device *); 82 83 extern struct cfdriver ld_cd; 84 85 static dev_type_open(ldopen); 86 static dev_type_close(ldclose); 87 static dev_type_read(ldread); 88 static dev_type_write(ldwrite); 89 static dev_type_ioctl(ldioctl); 90 static dev_type_strategy(ldstrategy); 91 static dev_type_dump(lddump); 92 static dev_type_size(ldsize); 93 94 const struct bdevsw ld_bdevsw = { 95 ldopen, ldclose, ldstrategy, ldioctl, lddump, ldsize, D_DISK 96 }; 97 98 const struct cdevsw ld_cdevsw = { 99 ldopen, ldclose, ldread, ldwrite, ldioctl, 100 nostop, notty, nopoll, nommap, nokqfilter, D_DISK 101 }; 102 103 static struct dkdriver lddkdriver = { ldstrategy, ldminphys }; 104 static void *ld_sdh; 105 106 void 107 ldattach(struct ld_softc *sc) 108 { 109 char tbuf[9]; 110 111 mutex_init(&sc->sc_mutex, MUTEX_DRIVER, IPL_BIO); 112 113 if ((sc->sc_flags & LDF_ENABLED) == 0) { 114 aprint_normal("%s: disabled\n", sc->sc_dv.dv_xname); 115 return; 116 } 117 118 /* Initialise and attach the disk structure. */ 119 sc->sc_dk.dk_driver = &lddkdriver; 120 sc->sc_dk.dk_name = sc->sc_dv.dv_xname; 121 disk_attach(&sc->sc_dk); 122 123 if (sc->sc_maxxfer > MAXPHYS) 124 sc->sc_maxxfer = MAXPHYS; 125 126 /* Build synthetic geometry if necessary. */ 127 if (sc->sc_nheads == 0 || sc->sc_nsectors == 0 || 128 sc->sc_ncylinders == 0) { 129 uint64_t ncyl; 130 131 if (sc->sc_secperunit <= 528 * 2048) /* 528MB */ 132 sc->sc_nheads = 16; 133 else if (sc->sc_secperunit <= 1024 * 2048) /* 1GB */ 134 sc->sc_nheads = 32; 135 else if (sc->sc_secperunit <= 21504 * 2048) /* 21GB */ 136 sc->sc_nheads = 64; 137 else if (sc->sc_secperunit <= 43008 * 2048) /* 42GB */ 138 sc->sc_nheads = 128; 139 else 140 sc->sc_nheads = 255; 141 142 sc->sc_nsectors = 63; 143 sc->sc_ncylinders = INT_MAX; 144 ncyl = sc->sc_secperunit / 145 (sc->sc_nheads * sc->sc_nsectors); 146 if (ncyl < INT_MAX) 147 sc->sc_ncylinders = (int)ncyl; 148 } 149 150 format_bytes(tbuf, sizeof(tbuf), sc->sc_secperunit * 151 sc->sc_secsize); 152 aprint_normal("%s: %s, %d cyl, %d head, %d sec, %d bytes/sect x %"PRIu64" sectors\n", 153 sc->sc_dv.dv_xname, tbuf, sc->sc_ncylinders, sc->sc_nheads, 154 sc->sc_nsectors, sc->sc_secsize, sc->sc_secperunit); 155 156 ld_set_properties(sc); 157 158 #if NRND > 0 159 /* Attach the device into the rnd source list. */ 160 rnd_attach_source(&sc->sc_rnd_source, sc->sc_dv.dv_xname, 161 RND_TYPE_DISK, 0); 162 #endif 163 164 /* Set the `shutdownhook'. */ 165 if (ld_sdh == NULL) 166 ld_sdh = shutdownhook_establish(ldshutdown, NULL); 167 bufq_alloc(&sc->sc_bufq, BUFQ_DISK_DEFAULT_STRAT, BUFQ_SORT_RAWBLOCK); 168 169 /* Discover wedges on this disk. */ 170 config_interrupts(&sc->sc_dv, ld_config_interrupts); 171 } 172 173 int 174 ldadjqparam(struct ld_softc *sc, int xmax) 175 { 176 int s; 177 178 s = splbio(); 179 sc->sc_maxqueuecnt = xmax; 180 splx(s); 181 182 return (0); 183 } 184 185 int 186 ldbegindetach(struct ld_softc *sc, int flags) 187 { 188 int s, rv = 0; 189 190 if ((sc->sc_flags & LDF_ENABLED) == 0) 191 return (0); 192 193 if ((flags & DETACH_FORCE) == 0 && sc->sc_dk.dk_openmask != 0) 194 return (EBUSY); 195 196 s = splbio(); 197 sc->sc_maxqueuecnt = 0; 198 sc->sc_flags |= LDF_DETACH; 199 while (sc->sc_queuecnt > 0) { 200 sc->sc_flags |= LDF_DRAIN; 201 rv = tsleep(&sc->sc_queuecnt, PRIBIO, "lddrn", 0); 202 if (rv) 203 break; 204 } 205 splx(s); 206 207 return (rv); 208 } 209 210 void 211 ldenddetach(struct ld_softc *sc) 212 { 213 int s, bmaj, cmaj, i, mn; 214 215 if ((sc->sc_flags & LDF_ENABLED) == 0) 216 return; 217 218 /* Wait for commands queued with the hardware to complete. */ 219 if (sc->sc_queuecnt != 0) 220 if (tsleep(&sc->sc_queuecnt, PRIBIO, "lddtch", 30 * hz)) 221 printf("%s: not drained\n", sc->sc_dv.dv_xname); 222 223 /* Locate the major numbers. */ 224 bmaj = bdevsw_lookup_major(&ld_bdevsw); 225 cmaj = cdevsw_lookup_major(&ld_cdevsw); 226 227 /* Kill off any queued buffers. */ 228 s = splbio(); 229 bufq_drain(sc->sc_bufq); 230 splx(s); 231 232 bufq_free(sc->sc_bufq); 233 234 /* Nuke the vnodes for any open instances. */ 235 for (i = 0; i < MAXPARTITIONS; i++) { 236 mn = DISKMINOR(device_unit(&sc->sc_dv), i); 237 vdevgone(bmaj, mn, mn, VBLK); 238 vdevgone(cmaj, mn, mn, VCHR); 239 } 240 241 /* Delete all of our wedges. */ 242 dkwedge_delall(&sc->sc_dk); 243 244 /* Detach from the disk list. */ 245 disk_detach(&sc->sc_dk); 246 247 #if NRND > 0 248 /* Unhook the entropy source. */ 249 rnd_detach_source(&sc->sc_rnd_source); 250 #endif 251 252 /* 253 * XXX We can't really flush the cache here, beceause the 254 * XXX device may already be non-existent from the controller's 255 * XXX perspective. 256 */ 257 #if 0 258 /* Flush the device's cache. */ 259 if (sc->sc_flush != NULL) 260 if ((*sc->sc_flush)(sc) != 0) 261 printf("%s: unable to flush cache\n", 262 sc->sc_dv.dv_xname); 263 #endif 264 } 265 266 /* ARGSUSED */ 267 static void 268 ldshutdown(void *cookie) 269 { 270 struct ld_softc *sc; 271 int i; 272 273 for (i = 0; i < ld_cd.cd_ndevs; i++) { 274 if ((sc = device_lookup(&ld_cd, i)) == NULL) 275 continue; 276 if (sc->sc_flush != NULL && (*sc->sc_flush)(sc) != 0) 277 printf("%s: unable to flush cache\n", 278 sc->sc_dv.dv_xname); 279 } 280 } 281 282 /* ARGSUSED */ 283 static int 284 ldopen(dev_t dev, int flags, int fmt, struct lwp *l) 285 { 286 struct ld_softc *sc; 287 int error, unit, part; 288 289 unit = DISKUNIT(dev); 290 if ((sc = device_lookup(&ld_cd, unit)) == NULL) 291 return (ENXIO); 292 if ((sc->sc_flags & LDF_ENABLED) == 0) 293 return (ENODEV); 294 part = DISKPART(dev); 295 296 mutex_enter(&sc->sc_dk.dk_openlock); 297 298 if (sc->sc_dk.dk_openmask == 0) { 299 /* Load the partition info if not already loaded. */ 300 if ((sc->sc_flags & LDF_VLABEL) == 0) 301 ldgetdisklabel(sc); 302 } 303 304 /* Check that the partition exists. */ 305 if (part != RAW_PART && (part >= sc->sc_dk.dk_label->d_npartitions || 306 sc->sc_dk.dk_label->d_partitions[part].p_fstype == FS_UNUSED)) { 307 error = ENXIO; 308 goto bad1; 309 } 310 311 /* Ensure only one open at a time. */ 312 switch (fmt) { 313 case S_IFCHR: 314 sc->sc_dk.dk_copenmask |= (1 << part); 315 break; 316 case S_IFBLK: 317 sc->sc_dk.dk_bopenmask |= (1 << part); 318 break; 319 } 320 sc->sc_dk.dk_openmask = 321 sc->sc_dk.dk_copenmask | sc->sc_dk.dk_bopenmask; 322 323 error = 0; 324 bad1: 325 mutex_exit(&sc->sc_dk.dk_openlock); 326 return (error); 327 } 328 329 /* ARGSUSED */ 330 static int 331 ldclose(dev_t dev, int flags, int fmt, struct lwp *l) 332 { 333 struct ld_softc *sc; 334 int part, unit; 335 336 unit = DISKUNIT(dev); 337 part = DISKPART(dev); 338 sc = device_lookup(&ld_cd, unit); 339 340 mutex_enter(&sc->sc_dk.dk_openlock); 341 342 switch (fmt) { 343 case S_IFCHR: 344 sc->sc_dk.dk_copenmask &= ~(1 << part); 345 break; 346 case S_IFBLK: 347 sc->sc_dk.dk_bopenmask &= ~(1 << part); 348 break; 349 } 350 sc->sc_dk.dk_openmask = 351 sc->sc_dk.dk_copenmask | sc->sc_dk.dk_bopenmask; 352 353 if (sc->sc_dk.dk_openmask == 0) { 354 if (sc->sc_flush != NULL && (*sc->sc_flush)(sc) != 0) 355 printf("%s: unable to flush cache\n", 356 sc->sc_dv.dv_xname); 357 if ((sc->sc_flags & LDF_KLABEL) == 0) 358 sc->sc_flags &= ~LDF_VLABEL; 359 } 360 361 mutex_exit(&sc->sc_dk.dk_openlock); 362 return (0); 363 } 364 365 /* ARGSUSED */ 366 static int 367 ldread(dev_t dev, struct uio *uio, int ioflag) 368 { 369 370 return (physio(ldstrategy, NULL, dev, B_READ, ldminphys, uio)); 371 } 372 373 /* ARGSUSED */ 374 static int 375 ldwrite(dev_t dev, struct uio *uio, int ioflag) 376 { 377 378 return (physio(ldstrategy, NULL, dev, B_WRITE, ldminphys, uio)); 379 } 380 381 /* ARGSUSED */ 382 static int 383 ldioctl(dev_t dev, u_long cmd, void *addr, int32_t flag, struct lwp *l) 384 { 385 struct ld_softc *sc; 386 int part, unit, error; 387 #ifdef __HAVE_OLD_DISKLABEL 388 struct disklabel newlabel; 389 #endif 390 struct disklabel *lp; 391 392 unit = DISKUNIT(dev); 393 part = DISKPART(dev); 394 sc = device_lookup(&ld_cd, unit); 395 396 error = disk_ioctl(&sc->sc_dk, cmd, addr, flag, l); 397 if (error != EPASSTHROUGH) 398 return (error); 399 400 error = 0; 401 switch (cmd) { 402 case DIOCGDINFO: 403 memcpy(addr, sc->sc_dk.dk_label, sizeof(struct disklabel)); 404 return (0); 405 406 #ifdef __HAVE_OLD_DISKLABEL 407 case ODIOCGDINFO: 408 newlabel = *(sc->sc_dk.dk_label); 409 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 410 return ENOTTY; 411 memcpy(addr, &newlabel, sizeof(struct olddisklabel)); 412 return (0); 413 #endif 414 415 case DIOCGPART: 416 ((struct partinfo *)addr)->disklab = sc->sc_dk.dk_label; 417 ((struct partinfo *)addr)->part = 418 &sc->sc_dk.dk_label->d_partitions[part]; 419 break; 420 421 case DIOCWDINFO: 422 case DIOCSDINFO: 423 #ifdef __HAVE_OLD_DISKLABEL 424 case ODIOCWDINFO: 425 case ODIOCSDINFO: 426 427 if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) { 428 memset(&newlabel, 0, sizeof newlabel); 429 memcpy(&newlabel, addr, sizeof (struct olddisklabel)); 430 lp = &newlabel; 431 } else 432 #endif 433 lp = (struct disklabel *)addr; 434 435 if ((flag & FWRITE) == 0) 436 return (EBADF); 437 438 mutex_enter(&sc->sc_dk.dk_openlock); 439 sc->sc_flags |= LDF_LABELLING; 440 441 error = setdisklabel(sc->sc_dk.dk_label, 442 lp, /*sc->sc_dk.dk_openmask : */0, 443 sc->sc_dk.dk_cpulabel); 444 if (error == 0 && (cmd == DIOCWDINFO 445 #ifdef __HAVE_OLD_DISKLABEL 446 || cmd == ODIOCWDINFO 447 #endif 448 )) 449 error = writedisklabel( 450 MAKEDISKDEV(major(dev), DISKUNIT(dev), RAW_PART), 451 ldstrategy, sc->sc_dk.dk_label, 452 sc->sc_dk.dk_cpulabel); 453 454 sc->sc_flags &= ~LDF_LABELLING; 455 mutex_exit(&sc->sc_dk.dk_openlock); 456 break; 457 458 case DIOCKLABEL: 459 if ((flag & FWRITE) == 0) 460 return (EBADF); 461 if (*(int *)addr) 462 sc->sc_flags |= LDF_KLABEL; 463 else 464 sc->sc_flags &= ~LDF_KLABEL; 465 break; 466 467 case DIOCWLABEL: 468 if ((flag & FWRITE) == 0) 469 return (EBADF); 470 if (*(int *)addr) 471 sc->sc_flags |= LDF_WLABEL; 472 else 473 sc->sc_flags &= ~LDF_WLABEL; 474 break; 475 476 case DIOCGDEFLABEL: 477 ldgetdefaultlabel(sc, (struct disklabel *)addr); 478 break; 479 480 #ifdef __HAVE_OLD_DISKLABEL 481 case ODIOCGDEFLABEL: 482 ldgetdefaultlabel(sc, &newlabel); 483 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 484 return ENOTTY; 485 memcpy(addr, &newlabel, sizeof (struct olddisklabel)); 486 break; 487 #endif 488 489 case DIOCCACHESYNC: 490 /* 491 * XXX Do we really need to care about having a writable 492 * file descriptor here? 493 */ 494 if ((flag & FWRITE) == 0) 495 error = EBADF; 496 else if (sc->sc_flush) 497 error = (*sc->sc_flush)(sc); 498 else 499 error = 0; /* XXX Error out instead? */ 500 break; 501 502 case DIOCAWEDGE: 503 { 504 struct dkwedge_info *dkw = (void *) addr; 505 506 if ((flag & FWRITE) == 0) 507 return (EBADF); 508 509 /* If the ioctl happens here, the parent is us. */ 510 strcpy(dkw->dkw_parent, sc->sc_dv.dv_xname); 511 return (dkwedge_add(dkw)); 512 } 513 514 case DIOCDWEDGE: 515 { 516 struct dkwedge_info *dkw = (void *) addr; 517 518 if ((flag & FWRITE) == 0) 519 return (EBADF); 520 521 /* If the ioctl happens here, the parent is us. */ 522 strcpy(dkw->dkw_parent, sc->sc_dv.dv_xname); 523 return (dkwedge_del(dkw)); 524 } 525 526 case DIOCLWEDGES: 527 { 528 struct dkwedge_list *dkwl = (void *) addr; 529 530 return (dkwedge_list(&sc->sc_dk, dkwl, l)); 531 } 532 533 default: 534 error = ENOTTY; 535 break; 536 } 537 538 return (error); 539 } 540 541 static void 542 ldstrategy(struct buf *bp) 543 { 544 struct ld_softc *sc; 545 struct disklabel *lp; 546 daddr_t blkno; 547 int s, part; 548 549 sc = device_lookup(&ld_cd, DISKUNIT(bp->b_dev)); 550 part = DISKPART(bp->b_dev); 551 552 if ((sc->sc_flags & LDF_DETACH) != 0) { 553 bp->b_error = EIO; 554 goto done; 555 } 556 557 lp = sc->sc_dk.dk_label; 558 559 /* 560 * The transfer must be a whole number of blocks and the offset must 561 * not be negative. 562 */ 563 if ((bp->b_bcount % lp->d_secsize) != 0 || bp->b_blkno < 0) { 564 bp->b_error = EINVAL; 565 goto done; 566 } 567 568 /* If it's a null transfer, return immediately. */ 569 if (bp->b_bcount == 0) 570 goto done; 571 572 /* 573 * Do bounds checking and adjust the transfer. If error, process. 574 * If past the end of partition, just return. 575 */ 576 if (part != RAW_PART && 577 bounds_check_with_label(&sc->sc_dk, bp, 578 (sc->sc_flags & (LDF_WLABEL | LDF_LABELLING)) != 0) <= 0) { 579 goto done; 580 } 581 582 /* 583 * Convert the block number to absolute and put it in terms 584 * of the device's logical block size. 585 */ 586 if (lp->d_secsize == DEV_BSIZE) 587 blkno = bp->b_blkno; 588 else if (lp->d_secsize > DEV_BSIZE) 589 blkno = bp->b_blkno / (lp->d_secsize / DEV_BSIZE); 590 else 591 blkno = bp->b_blkno * (DEV_BSIZE / lp->d_secsize); 592 593 if (part != RAW_PART) 594 blkno += lp->d_partitions[part].p_offset; 595 596 bp->b_rawblkno = blkno; 597 598 s = splbio(); 599 ldstart(sc, bp); 600 splx(s); 601 return; 602 603 done: 604 bp->b_resid = bp->b_bcount; 605 biodone(bp); 606 } 607 608 static void 609 ldstart(struct ld_softc *sc, struct buf *bp) 610 { 611 int error; 612 613 mutex_enter(&sc->sc_mutex); 614 615 if (bp != NULL) 616 BUFQ_PUT(sc->sc_bufq, bp); 617 618 while (sc->sc_queuecnt < sc->sc_maxqueuecnt) { 619 /* See if there is work to do. */ 620 if ((bp = BUFQ_PEEK(sc->sc_bufq)) == NULL) 621 break; 622 623 disk_busy(&sc->sc_dk); 624 sc->sc_queuecnt++; 625 626 if (__predict_true((error = (*sc->sc_start)(sc, bp)) == 0)) { 627 /* 628 * The back-end is running the job; remove it from 629 * the queue. 630 */ 631 (void) BUFQ_GET(sc->sc_bufq); 632 } else { 633 disk_unbusy(&sc->sc_dk, 0, (bp->b_flags & B_READ)); 634 sc->sc_queuecnt--; 635 if (error == EAGAIN) { 636 /* 637 * Temporary resource shortage in the 638 * back-end; just defer the job until 639 * later. 640 * 641 * XXX We might consider a watchdog timer 642 * XXX to make sure we are kicked into action. 643 */ 644 break; 645 } else { 646 (void) BUFQ_GET(sc->sc_bufq); 647 bp->b_error = error; 648 bp->b_resid = bp->b_bcount; 649 mutex_exit(&sc->sc_mutex); 650 biodone(bp); 651 mutex_enter(&sc->sc_mutex); 652 } 653 } 654 } 655 656 mutex_exit(&sc->sc_mutex); 657 } 658 659 void 660 lddone(struct ld_softc *sc, struct buf *bp) 661 { 662 663 if (bp->b_error != 0) { 664 diskerr(bp, "ld", "error", LOG_PRINTF, 0, sc->sc_dk.dk_label); 665 printf("\n"); 666 } 667 668 disk_unbusy(&sc->sc_dk, bp->b_bcount - bp->b_resid, 669 (bp->b_flags & B_READ)); 670 #if NRND > 0 671 rnd_add_uint32(&sc->sc_rnd_source, bp->b_rawblkno); 672 #endif 673 biodone(bp); 674 675 mutex_enter(&sc->sc_mutex); 676 if (--sc->sc_queuecnt <= sc->sc_maxqueuecnt) { 677 if ((sc->sc_flags & LDF_DRAIN) != 0) { 678 sc->sc_flags &= ~LDF_DRAIN; 679 wakeup(&sc->sc_queuecnt); 680 } 681 mutex_exit(&sc->sc_mutex); 682 ldstart(sc, NULL); 683 } else 684 mutex_exit(&sc->sc_mutex); 685 } 686 687 static int 688 ldsize(dev_t dev) 689 { 690 struct ld_softc *sc; 691 int part, unit, omask, size; 692 693 unit = DISKUNIT(dev); 694 if ((sc = device_lookup(&ld_cd, unit)) == NULL) 695 return (ENODEV); 696 if ((sc->sc_flags & LDF_ENABLED) == 0) 697 return (ENODEV); 698 part = DISKPART(dev); 699 700 omask = sc->sc_dk.dk_openmask & (1 << part); 701 702 if (omask == 0 && ldopen(dev, 0, S_IFBLK, NULL) != 0) 703 return (-1); 704 else if (sc->sc_dk.dk_label->d_partitions[part].p_fstype != FS_SWAP) 705 size = -1; 706 else 707 size = sc->sc_dk.dk_label->d_partitions[part].p_size * 708 (sc->sc_dk.dk_label->d_secsize / DEV_BSIZE); 709 if (omask == 0 && ldclose(dev, 0, S_IFBLK, NULL) != 0) 710 return (-1); 711 712 return (size); 713 } 714 715 /* 716 * Load the label information from the specified device. 717 */ 718 static void 719 ldgetdisklabel(struct ld_softc *sc) 720 { 721 const char *errstring; 722 723 ldgetdefaultlabel(sc, sc->sc_dk.dk_label); 724 725 /* Call the generic disklabel extraction routine. */ 726 errstring = readdisklabel(MAKEDISKDEV(0, device_unit(&sc->sc_dv), 727 RAW_PART), ldstrategy, sc->sc_dk.dk_label, sc->sc_dk.dk_cpulabel); 728 if (errstring != NULL) 729 printf("%s: %s\n", sc->sc_dv.dv_xname, errstring); 730 731 /* In-core label now valid. */ 732 sc->sc_flags |= LDF_VLABEL; 733 } 734 735 /* 736 * Construct a ficticious label. 737 */ 738 static void 739 ldgetdefaultlabel(struct ld_softc *sc, struct disklabel *lp) 740 { 741 742 memset(lp, 0, sizeof(struct disklabel)); 743 744 lp->d_secsize = sc->sc_secsize; 745 lp->d_ntracks = sc->sc_nheads; 746 lp->d_nsectors = sc->sc_nsectors; 747 lp->d_ncylinders = sc->sc_ncylinders; 748 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 749 lp->d_type = DTYPE_LD; 750 strlcpy(lp->d_typename, "unknown", sizeof(lp->d_typename)); 751 strlcpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); 752 lp->d_secperunit = sc->sc_secperunit; 753 lp->d_rpm = 7200; 754 lp->d_interleave = 1; 755 lp->d_flags = 0; 756 757 lp->d_partitions[RAW_PART].p_offset = 0; 758 lp->d_partitions[RAW_PART].p_size = 759 lp->d_secperunit * (lp->d_secsize / DEV_BSIZE); 760 lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED; 761 lp->d_npartitions = RAW_PART + 1; 762 763 lp->d_magic = DISKMAGIC; 764 lp->d_magic2 = DISKMAGIC; 765 lp->d_checksum = dkcksum(lp); 766 } 767 768 /* 769 * Take a dump. 770 */ 771 static int 772 lddump(dev_t dev, daddr_t blkno, void *vav, size_t size) 773 { 774 char *va = vav; 775 struct ld_softc *sc; 776 struct disklabel *lp; 777 int unit, part, nsects, sectoff, towrt, nblk, maxblkcnt, rv; 778 static int dumping; 779 780 unit = DISKUNIT(dev); 781 if ((sc = device_lookup(&ld_cd, unit)) == NULL) 782 return (ENXIO); 783 if ((sc->sc_flags & LDF_ENABLED) == 0) 784 return (ENODEV); 785 if (sc->sc_dump == NULL) 786 return (ENXIO); 787 788 /* Check if recursive dump; if so, punt. */ 789 if (dumping) 790 return (EFAULT); 791 dumping = 1; 792 793 /* Convert to disk sectors. Request must be a multiple of size. */ 794 part = DISKPART(dev); 795 lp = sc->sc_dk.dk_label; 796 if ((size % lp->d_secsize) != 0) 797 return (EFAULT); 798 towrt = size / lp->d_secsize; 799 blkno = dbtob(blkno) / lp->d_secsize; /* blkno in DEV_BSIZE units */ 800 801 nsects = lp->d_partitions[part].p_size; 802 sectoff = lp->d_partitions[part].p_offset; 803 804 /* Check transfer bounds against partition size. */ 805 if ((blkno < 0) || ((blkno + towrt) > nsects)) 806 return (EINVAL); 807 808 /* Offset block number to start of partition. */ 809 blkno += sectoff; 810 811 /* Start dumping and return when done. */ 812 maxblkcnt = sc->sc_maxxfer / sc->sc_secsize - 1; 813 while (towrt > 0) { 814 nblk = min(maxblkcnt, towrt); 815 816 if ((rv = (*sc->sc_dump)(sc, va, blkno, nblk)) != 0) 817 return (rv); 818 819 towrt -= nblk; 820 blkno += nblk; 821 va += nblk * sc->sc_secsize; 822 } 823 824 dumping = 0; 825 return (0); 826 } 827 828 /* 829 * Adjust the size of a transfer. 830 */ 831 static void 832 ldminphys(struct buf *bp) 833 { 834 struct ld_softc *sc; 835 836 sc = device_lookup(&ld_cd, DISKUNIT(bp->b_dev)); 837 838 if (bp->b_bcount > sc->sc_maxxfer) 839 bp->b_bcount = sc->sc_maxxfer; 840 minphys(bp); 841 } 842 843 static void 844 ld_set_properties(struct ld_softc *ld) 845 { 846 prop_dictionary_t disk_info, odisk_info, geom; 847 848 disk_info = prop_dictionary_create(); 849 850 geom = prop_dictionary_create(); 851 852 prop_dictionary_set_uint64(geom, "sectors-per-unit", 853 ld->sc_secperunit); 854 855 prop_dictionary_set_uint32(geom, "sector-size", 856 ld->sc_secsize); 857 858 prop_dictionary_set_uint16(geom, "sectors-per-track", 859 ld->sc_nsectors); 860 861 prop_dictionary_set_uint16(geom, "tracks-per-cylinder", 862 ld->sc_nheads); 863 864 prop_dictionary_set_uint64(geom, "cylinders-per-unit", 865 ld->sc_ncylinders); 866 867 prop_dictionary_set(disk_info, "geometry", geom); 868 prop_object_release(geom); 869 870 prop_dictionary_set(device_properties(&ld->sc_dv), 871 "disk-info", disk_info); 872 873 /* 874 * Don't release disk_info here; we keep a reference to it. 875 * disk_detach() will release it when we go away. 876 */ 877 878 odisk_info = ld->sc_dk.dk_info; 879 ld->sc_dk.dk_info = disk_info; 880 if (odisk_info) 881 prop_object_release(odisk_info); 882 } 883 884 static void 885 ld_config_interrupts (struct device *d) 886 { 887 struct ld_softc *sc = (struct ld_softc *)d; 888 dkwedge_discover(&sc->sc_dk); 889 } 890
Indexes created Tue Sep 23 14:10:03 GMT 2025