ld.c revision 1.24
1 /* $NetBSD: ld.c,v 1.24 2003/06/13 02:32:27 thorpej 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 1.24 2003/06/13 02:32:27 thorpej 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/endian.h> 56 #include <sys/disklabel.h> 57 #include <sys/disk.h> 58 #include <sys/dkio.h> 59 #include <sys/stat.h> 60 #include <sys/lock.h> 61 #include <sys/conf.h> 62 #include <sys/fcntl.h> 63 #include <sys/vnode.h> 64 #include <sys/syslog.h> 65 #if NRND > 0 66 #include <sys/rnd.h> 67 #endif 68 69 #include <dev/ldvar.h> 70 71 static void ldgetdefaultlabel(struct ld_softc *, struct disklabel *); 72 static void ldgetdisklabel(struct ld_softc *); 73 static int ldlock(struct ld_softc *); 74 static void ldminphys(struct buf *bp); 75 static void ldshutdown(void *); 76 static void ldstart(struct ld_softc *); 77 static void ldunlock(struct ld_softc *); 78 79 extern struct cfdriver ld_cd; 80 81 dev_type_open(ldopen); 82 dev_type_close(ldclose); 83 dev_type_read(ldread); 84 dev_type_write(ldwrite); 85 dev_type_ioctl(ldioctl); 86 dev_type_strategy(ldstrategy); 87 dev_type_dump(lddump); 88 dev_type_size(ldsize); 89 90 const struct bdevsw ld_bdevsw = { 91 ldopen, ldclose, ldstrategy, ldioctl, lddump, ldsize, D_DISK 92 }; 93 94 const struct cdevsw ld_cdevsw = { 95 ldopen, ldclose, ldread, ldwrite, ldioctl, 96 nostop, notty, nopoll, nommap, nokqfilter, D_DISK 97 }; 98 99 static struct dkdriver lddkdriver = { ldstrategy }; 100 static void *ld_sdh; 101 102 void 103 ldattach(struct ld_softc *sc) 104 { 105 char buf[9]; 106 107 if ((sc->sc_flags & LDF_ENABLED) == 0) { 108 printf("%s: disabled\n", sc->sc_dv.dv_xname); 109 return; 110 } 111 112 /* Initialise and attach the disk structure. */ 113 sc->sc_dk.dk_driver = &lddkdriver; 114 sc->sc_dk.dk_name = sc->sc_dv.dv_xname; 115 disk_attach(&sc->sc_dk); 116 117 if (sc->sc_maxxfer > MAXPHYS) 118 sc->sc_maxxfer = MAXPHYS; 119 120 /* Build synthetic geometry if necessary. */ 121 if (sc->sc_nheads == 0 || sc->sc_nsectors == 0 || 122 sc->sc_ncylinders == 0) { 123 if (sc->sc_secperunit <= 528 * 2048) /* 528MB */ 124 sc->sc_nheads = 16; 125 else if (sc->sc_secperunit <= 1024 * 2048) /* 1GB */ 126 sc->sc_nheads = 32; 127 else if (sc->sc_secperunit <= 21504 * 2048) /* 21GB */ 128 sc->sc_nheads = 64; 129 else if (sc->sc_secperunit <= 43008 * 2048) /* 42GB */ 130 sc->sc_nheads = 128; 131 else 132 sc->sc_nheads = 255; 133 134 sc->sc_nsectors = 63; 135 sc->sc_ncylinders = sc->sc_secperunit / 136 (sc->sc_nheads * sc->sc_nsectors); 137 } 138 139 format_bytes(buf, sizeof(buf), (u_int64_t)sc->sc_secperunit * 140 sc->sc_secsize); 141 printf("%s: %s, %d cyl, %d head, %d sec, %d bytes/sect x %d sectors\n", 142 sc->sc_dv.dv_xname, buf, sc->sc_ncylinders, sc->sc_nheads, 143 sc->sc_nsectors, sc->sc_secsize, sc->sc_secperunit); 144 145 #if NRND > 0 146 /* Attach the device into the rnd source list. */ 147 rnd_attach_source(&sc->sc_rnd_source, sc->sc_dv.dv_xname, 148 RND_TYPE_DISK, 0); 149 #endif 150 151 /* Set the `shutdownhook'. */ 152 if (ld_sdh == NULL) 153 ld_sdh = shutdownhook_establish(ldshutdown, NULL); 154 bufq_alloc(&sc->sc_bufq, BUFQ_FCFS); 155 } 156 157 int 158 ldadjqparam(struct ld_softc *sc, int max) 159 { 160 int s; 161 162 s = splbio(); 163 sc->sc_maxqueuecnt = max; 164 splx(s); 165 166 return (0); 167 } 168 169 int 170 ldbegindetach(struct ld_softc *sc, int flags) 171 { 172 int s, rv = 0; 173 174 if ((sc->sc_flags & LDF_ENABLED) == 0) 175 return (0); 176 177 if ((flags & DETACH_FORCE) == 0 && sc->sc_dk.dk_openmask != 0) 178 return (EBUSY); 179 180 s = splbio(); 181 sc->sc_maxqueuecnt = 0; 182 sc->sc_flags |= LDF_DETACH; 183 while (sc->sc_queuecnt > 0) { 184 sc->sc_flags |= LDF_DRAIN; 185 rv = tsleep(&sc->sc_queuecnt, PRIBIO, "lddrn", 0); 186 if (rv) 187 break; 188 } 189 splx(s); 190 191 return (rv); 192 } 193 194 void 195 ldenddetach(struct ld_softc *sc) 196 { 197 struct buf *bp; 198 int s, bmaj, cmaj, i, mn; 199 200 if ((sc->sc_flags & LDF_ENABLED) == 0) 201 return; 202 203 /* Wait for commands queued with the hardware to complete. */ 204 if (sc->sc_queuecnt != 0) 205 if (tsleep(&sc->sc_queuecnt, PRIBIO, "lddtch", 30 * hz)) 206 printf("%s: not drained\n", sc->sc_dv.dv_xname); 207 208 /* Locate the major numbers. */ 209 bmaj = bdevsw_lookup_major(&ld_bdevsw); 210 cmaj = cdevsw_lookup_major(&ld_cdevsw); 211 212 /* Kill off any queued buffers. */ 213 s = splbio(); 214 while ((bp = BUFQ_GET(&sc->sc_bufq)) != NULL) { 215 bp->b_error = EIO; 216 bp->b_flags |= B_ERROR; 217 bp->b_resid = bp->b_bcount; 218 biodone(bp); 219 } 220 bufq_free(&sc->sc_bufq); 221 splx(s); 222 223 /* Nuke the vnodes for any open instances. */ 224 for (i = 0; i < MAXPARTITIONS; i++) { 225 mn = DISKMINOR(sc->sc_dv.dv_unit, i); 226 vdevgone(bmaj, mn, mn, VBLK); 227 vdevgone(cmaj, mn, mn, VCHR); 228 } 229 230 /* Detach from the disk list. */ 231 disk_detach(&sc->sc_dk); 232 233 #if NRND > 0 234 /* Unhook the entropy source. */ 235 rnd_detach_source(&sc->sc_rnd_source); 236 #endif 237 238 /* 239 * XXX We can't really flush the cache here, beceause the 240 * XXX device may already be non-existent from the controller's 241 * XXX perspective. 242 */ 243 #if 0 244 /* Flush the device's cache. */ 245 if (sc->sc_flush != NULL) 246 if ((*sc->sc_flush)(sc) != 0) 247 printf("%s: unable to flush cache\n", 248 sc->sc_dv.dv_xname); 249 #endif 250 } 251 252 /* ARGSUSED */ 253 static void 254 ldshutdown(void *cookie) 255 { 256 struct ld_softc *sc; 257 int i; 258 259 for (i = 0; i < ld_cd.cd_ndevs; i++) { 260 if ((sc = device_lookup(&ld_cd, i)) == NULL) 261 continue; 262 if (sc->sc_flush != NULL && (*sc->sc_flush)(sc) != 0) 263 printf("%s: unable to flush cache\n", 264 sc->sc_dv.dv_xname); 265 } 266 } 267 268 /* ARGSUSED */ 269 int 270 ldopen(dev_t dev, int flags, int fmt, struct proc *p) 271 { 272 struct ld_softc *sc; 273 int unit, part; 274 275 unit = DISKUNIT(dev); 276 if ((sc = device_lookup(&ld_cd, unit))== NULL) 277 return (ENXIO); 278 if ((sc->sc_flags & LDF_ENABLED) == 0) 279 return (ENODEV); 280 part = DISKPART(dev); 281 ldlock(sc); 282 283 if (sc->sc_dk.dk_openmask == 0) { 284 /* Load the partition info if not already loaded. */ 285 if ((sc->sc_flags & LDF_VLABEL) == 0) 286 ldgetdisklabel(sc); 287 } 288 289 /* Check that the partition exists. */ 290 if (part != RAW_PART && (part >= sc->sc_dk.dk_label->d_npartitions || 291 sc->sc_dk.dk_label->d_partitions[part].p_fstype == FS_UNUSED)) { 292 ldunlock(sc); 293 return (ENXIO); 294 } 295 296 /* Ensure only one open at a time. */ 297 switch (fmt) { 298 case S_IFCHR: 299 sc->sc_dk.dk_copenmask |= (1 << part); 300 break; 301 case S_IFBLK: 302 sc->sc_dk.dk_bopenmask |= (1 << part); 303 break; 304 } 305 sc->sc_dk.dk_openmask = 306 sc->sc_dk.dk_copenmask | sc->sc_dk.dk_bopenmask; 307 308 ldunlock(sc); 309 return (0); 310 } 311 312 /* ARGSUSED */ 313 int 314 ldclose(dev_t dev, int flags, int fmt, struct proc *p) 315 { 316 struct ld_softc *sc; 317 int part, unit; 318 319 unit = DISKUNIT(dev); 320 part = DISKPART(dev); 321 sc = device_lookup(&ld_cd, unit); 322 ldlock(sc); 323 324 switch (fmt) { 325 case S_IFCHR: 326 sc->sc_dk.dk_copenmask &= ~(1 << part); 327 break; 328 case S_IFBLK: 329 sc->sc_dk.dk_bopenmask &= ~(1 << part); 330 break; 331 } 332 sc->sc_dk.dk_openmask = 333 sc->sc_dk.dk_copenmask | sc->sc_dk.dk_bopenmask; 334 335 if (sc->sc_dk.dk_openmask == 0) { 336 if (sc->sc_flush != NULL && (*sc->sc_flush)(sc) != 0) 337 printf("%s: unable to flush cache\n", 338 sc->sc_dv.dv_xname); 339 if ((sc->sc_flags & LDF_KLABEL) == 0) 340 sc->sc_flags &= ~LDF_VLABEL; 341 } 342 343 ldunlock(sc); 344 return (0); 345 } 346 347 /* ARGSUSED */ 348 int 349 ldread(dev_t dev, struct uio *uio, int ioflag) 350 { 351 352 return (physio(ldstrategy, NULL, dev, B_READ, ldminphys, uio)); 353 } 354 355 /* ARGSUSED */ 356 int 357 ldwrite(dev_t dev, struct uio *uio, int ioflag) 358 { 359 360 return (physio(ldstrategy, NULL, dev, B_WRITE, ldminphys, uio)); 361 } 362 363 /* ARGSUSED */ 364 int 365 ldioctl(dev_t dev, u_long cmd, caddr_t addr, int32_t flag, struct proc *p) 366 { 367 struct ld_softc *sc; 368 int part, unit, error; 369 #ifdef __HAVE_OLD_DISKLABEL 370 struct disklabel newlabel; 371 #endif 372 struct disklabel *lp; 373 374 unit = DISKUNIT(dev); 375 part = DISKPART(dev); 376 sc = device_lookup(&ld_cd, unit); 377 error = 0; 378 379 switch (cmd) { 380 case DIOCGDINFO: 381 memcpy(addr, sc->sc_dk.dk_label, sizeof(struct disklabel)); 382 return (0); 383 384 #ifdef __HAVE_OLD_DISKLABEL 385 case ODIOCGDINFO: 386 newlabel = *(sc->sc_dk.dk_label); 387 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 388 return ENOTTY; 389 memcpy(addr, &newlabel, sizeof(struct olddisklabel)); 390 return (0); 391 #endif 392 393 case DIOCGPART: 394 ((struct partinfo *)addr)->disklab = sc->sc_dk.dk_label; 395 ((struct partinfo *)addr)->part = 396 &sc->sc_dk.dk_label->d_partitions[part]; 397 break; 398 399 case DIOCWDINFO: 400 case DIOCSDINFO: 401 #ifdef __HAVE_OLD_DISKLABEL 402 case ODIOCWDINFO: 403 case ODIOCSDINFO: 404 405 if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) { 406 memset(&newlabel, 0, sizeof newlabel); 407 memcpy(&newlabel, addr, sizeof (struct olddisklabel)); 408 lp = &newlabel; 409 } else 410 #endif 411 lp = (struct disklabel *)addr; 412 413 if ((flag & FWRITE) == 0) 414 return (EBADF); 415 416 if ((error = ldlock(sc)) != 0) 417 return (error); 418 sc->sc_flags |= LDF_LABELLING; 419 420 error = setdisklabel(sc->sc_dk.dk_label, 421 lp, /*sc->sc_dk.dk_openmask : */0, 422 sc->sc_dk.dk_cpulabel); 423 if (error == 0 && (cmd == DIOCWDINFO 424 #ifdef __HAVE_OLD_DISKLABEL 425 || cmd == ODIOCWDINFO 426 #endif 427 )) 428 error = writedisklabel( 429 MAKEDISKDEV(major(dev), DISKUNIT(dev), RAW_PART), 430 ldstrategy, sc->sc_dk.dk_label, 431 sc->sc_dk.dk_cpulabel); 432 433 sc->sc_flags &= ~LDF_LABELLING; 434 ldunlock(sc); 435 break; 436 437 case DIOCKLABEL: 438 if ((flag & FWRITE) == 0) 439 return (EBADF); 440 if (*(int *)addr) 441 sc->sc_flags |= LDF_KLABEL; 442 else 443 sc->sc_flags &= ~LDF_KLABEL; 444 break; 445 446 case DIOCWLABEL: 447 if ((flag & FWRITE) == 0) 448 return (EBADF); 449 if (*(int *)addr) 450 sc->sc_flags |= LDF_WLABEL; 451 else 452 sc->sc_flags &= ~LDF_WLABEL; 453 break; 454 455 case DIOCGDEFLABEL: 456 ldgetdefaultlabel(sc, (struct disklabel *)addr); 457 break; 458 459 #ifdef __HAVE_OLD_DISKLABEL 460 case ODIOCGDEFLABEL: 461 ldgetdefaultlabel(sc, &newlabel); 462 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 463 return ENOTTY; 464 memcpy(addr, &newlabel, sizeof (struct olddisklabel)); 465 break; 466 #endif 467 468 default: 469 error = ENOTTY; 470 break; 471 } 472 473 return (error); 474 } 475 476 void 477 ldstrategy(struct buf *bp) 478 { 479 struct ld_softc *sc; 480 struct disklabel *lp; 481 daddr_t blkno; 482 int s, part; 483 484 sc = device_lookup(&ld_cd, DISKUNIT(bp->b_dev)); 485 part = DISKPART(bp->b_dev); 486 487 if ((sc->sc_flags & LDF_DETACH) != 0) { 488 bp->b_error = EIO; 489 goto bad; 490 } 491 492 lp = sc->sc_dk.dk_label; 493 494 /* 495 * The transfer must be a whole number of blocks and the offset must 496 * not be negative. 497 */ 498 if ((bp->b_bcount % lp->d_secsize) != 0 || bp->b_blkno < 0) { 499 bp->b_error = EINVAL; 500 goto bad; 501 } 502 503 /* If it's a null transfer, return immediately. */ 504 if (bp->b_bcount == 0) 505 goto done; 506 507 /* 508 * Do bounds checking and adjust the transfer. If error, process. 509 * If past the end of partition, just return. 510 */ 511 if (part != RAW_PART && 512 bounds_check_with_label(&sc->sc_dk, bp, 513 (sc->sc_flags & (LDF_WLABEL | LDF_LABELLING)) != 0) <= 0) { 514 goto done; 515 } 516 517 /* 518 * Convert the block number to absolute and put it in terms 519 * of the device's logical block size. 520 */ 521 if (lp->d_secsize == DEV_BSIZE) 522 blkno = bp->b_blkno; 523 else if (lp->d_secsize > DEV_BSIZE) 524 blkno = bp->b_blkno / (lp->d_secsize / DEV_BSIZE); 525 else 526 blkno = bp->b_blkno * (DEV_BSIZE / lp->d_secsize); 527 528 if (part != RAW_PART) 529 blkno += lp->d_partitions[part].p_offset; 530 531 bp->b_rawblkno = blkno; 532 533 s = splbio(); 534 BUFQ_PUT(&sc->sc_bufq, bp); 535 ldstart(sc); 536 splx(s); 537 return; 538 539 bad: 540 bp->b_flags |= B_ERROR; 541 done: 542 bp->b_resid = bp->b_bcount; 543 biodone(bp); 544 } 545 546 static void 547 ldstart(struct ld_softc *sc) 548 { 549 struct buf *bp; 550 int error; 551 552 while (sc->sc_queuecnt < sc->sc_maxqueuecnt) { 553 /* See if there is work to do. */ 554 if ((bp = BUFQ_PEEK(&sc->sc_bufq)) == NULL) 555 break; 556 557 disk_busy(&sc->sc_dk); 558 sc->sc_queuecnt++; 559 560 if (__predict_true((error = (*sc->sc_start)(sc, bp)) == 0)) { 561 /* 562 * The back-end is running the job; remove it from 563 * the queue. 564 */ 565 (void) BUFQ_GET(&sc->sc_bufq); 566 } else { 567 disk_unbusy(&sc->sc_dk, 0, (bp->b_flags & B_READ)); 568 sc->sc_queuecnt--; 569 if (error == EAGAIN) { 570 /* 571 * Temporary resource shortage in the 572 * back-end; just defer the job until 573 * later. 574 * 575 * XXX We might consider a watchdog timer 576 * XXX to make sure we are kicked into action. 577 */ 578 break; 579 } else { 580 (void) BUFQ_GET(&sc->sc_bufq); 581 bp->b_error = error; 582 bp->b_flags |= B_ERROR; 583 bp->b_resid = bp->b_bcount; 584 biodone(bp); 585 } 586 } 587 } 588 } 589 590 void 591 lddone(struct ld_softc *sc, struct buf *bp) 592 { 593 594 if ((bp->b_flags & B_ERROR) != 0) { 595 diskerr(bp, "ld", "error", LOG_PRINTF, 0, sc->sc_dk.dk_label); 596 printf("\n"); 597 } 598 599 disk_unbusy(&sc->sc_dk, bp->b_bcount - bp->b_resid, 600 (bp->b_flags & B_READ)); 601 #if NRND > 0 602 rnd_add_uint32(&sc->sc_rnd_source, bp->b_rawblkno); 603 #endif 604 biodone(bp); 605 606 if (--sc->sc_queuecnt <= sc->sc_maxqueuecnt) { 607 if ((sc->sc_flags & LDF_DRAIN) != 0) { 608 sc->sc_flags &= ~LDF_DRAIN; 609 wakeup(&sc->sc_queuecnt); 610 } 611 ldstart(sc); 612 } 613 } 614 615 int 616 ldsize(dev_t dev) 617 { 618 struct ld_softc *sc; 619 int part, unit, omask, size; 620 621 unit = DISKUNIT(dev); 622 if ((sc = device_lookup(&ld_cd, unit)) == NULL) 623 return (ENODEV); 624 if ((sc->sc_flags & LDF_ENABLED) == 0) 625 return (ENODEV); 626 part = DISKPART(dev); 627 628 omask = sc->sc_dk.dk_openmask & (1 << part); 629 630 if (omask == 0 && ldopen(dev, 0, S_IFBLK, NULL) != 0) 631 return (-1); 632 else if (sc->sc_dk.dk_label->d_partitions[part].p_fstype != FS_SWAP) 633 size = -1; 634 else 635 size = sc->sc_dk.dk_label->d_partitions[part].p_size * 636 (sc->sc_dk.dk_label->d_secsize / DEV_BSIZE); 637 if (omask == 0 && ldclose(dev, 0, S_IFBLK, NULL) != 0) 638 return (-1); 639 640 return (size); 641 } 642 643 /* 644 * Load the label information from the specified device. 645 */ 646 static void 647 ldgetdisklabel(struct ld_softc *sc) 648 { 649 const char *errstring; 650 651 ldgetdefaultlabel(sc, sc->sc_dk.dk_label); 652 653 /* Call the generic disklabel extraction routine. */ 654 errstring = readdisklabel(MAKEDISKDEV(0, sc->sc_dv.dv_unit, RAW_PART), 655 ldstrategy, sc->sc_dk.dk_label, sc->sc_dk.dk_cpulabel); 656 if (errstring != NULL) 657 printf("%s: %s\n", sc->sc_dv.dv_xname, errstring); 658 659 /* In-core label now valid. */ 660 sc->sc_flags |= LDF_VLABEL; 661 } 662 663 /* 664 * Construct a ficticious label. 665 */ 666 static void 667 ldgetdefaultlabel(struct ld_softc *sc, struct disklabel *lp) 668 { 669 670 memset(lp, 0, sizeof(struct disklabel)); 671 672 lp->d_secsize = sc->sc_secsize; 673 lp->d_ntracks = sc->sc_nheads; 674 lp->d_nsectors = sc->sc_nsectors; 675 lp->d_ncylinders = sc->sc_ncylinders; 676 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 677 lp->d_type = DTYPE_LD; 678 strlcpy(lp->d_typename, "unknown", sizeof(lp->d_typename)); 679 strlcpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); 680 lp->d_secperunit = sc->sc_secperunit; 681 lp->d_rpm = 7200; 682 lp->d_interleave = 1; 683 lp->d_flags = 0; 684 685 lp->d_partitions[RAW_PART].p_offset = 0; 686 lp->d_partitions[RAW_PART].p_size = 687 lp->d_secperunit * (lp->d_secsize / DEV_BSIZE); 688 lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED; 689 lp->d_npartitions = RAW_PART + 1; 690 691 lp->d_magic = DISKMAGIC; 692 lp->d_magic2 = DISKMAGIC; 693 lp->d_checksum = dkcksum(lp); 694 } 695 696 /* 697 * Wait interruptibly for an exclusive lock. 698 * 699 * XXX Several drivers do this; it should be abstracted and made MP-safe. 700 */ 701 static int 702 ldlock(struct ld_softc *sc) 703 { 704 int error; 705 706 while ((sc->sc_flags & LDF_LKHELD) != 0) { 707 sc->sc_flags |= LDF_LKWANTED; 708 if ((error = tsleep(sc, PRIBIO | PCATCH, "ldlck", 0)) != 0) 709 return (error); 710 } 711 sc->sc_flags |= LDF_LKHELD; 712 return (0); 713 } 714 715 /* 716 * Unlock and wake up any waiters. 717 */ 718 static void 719 ldunlock(struct ld_softc *sc) 720 { 721 722 sc->sc_flags &= ~LDF_LKHELD; 723 if ((sc->sc_flags & LDF_LKWANTED) != 0) { 724 sc->sc_flags &= ~LDF_LKWANTED; 725 wakeup(sc); 726 } 727 } 728 729 /* 730 * Take a dump. 731 */ 732 int 733 lddump(dev_t dev, daddr_t blkno, caddr_t va, size_t size) 734 { 735 struct ld_softc *sc; 736 struct disklabel *lp; 737 int unit, part, nsects, sectoff, towrt, nblk, maxblkcnt, rv; 738 static int dumping; 739 740 unit = DISKUNIT(dev); 741 if ((sc = device_lookup(&ld_cd, unit)) == NULL) 742 return (ENXIO); 743 if ((sc->sc_flags & LDF_ENABLED) == 0) 744 return (ENODEV); 745 if (sc->sc_dump == NULL) 746 return (ENXIO); 747 748 /* Check if recursive dump; if so, punt. */ 749 if (dumping) 750 return (EFAULT); 751 dumping = 1; 752 753 /* Convert to disk sectors. Request must be a multiple of size. */ 754 part = DISKPART(dev); 755 lp = sc->sc_dk.dk_label; 756 if ((size % lp->d_secsize) != 0) 757 return (EFAULT); 758 towrt = size / lp->d_secsize; 759 blkno = dbtob(blkno) / lp->d_secsize; /* blkno in DEV_BSIZE units */ 760 761 nsects = lp->d_partitions[part].p_size; 762 sectoff = lp->d_partitions[part].p_offset; 763 764 /* Check transfer bounds against partition size. */ 765 if ((blkno < 0) || ((blkno + towrt) > nsects)) 766 return (EINVAL); 767 768 /* Offset block number to start of partition. */ 769 blkno += sectoff; 770 771 /* Start dumping and return when done. */ 772 maxblkcnt = sc->sc_maxxfer / sc->sc_secsize - 1; 773 while (towrt > 0) { 774 nblk = min(maxblkcnt, towrt); 775 776 if ((rv = (*sc->sc_dump)(sc, va, blkno, nblk)) != 0) 777 return (rv); 778 779 towrt -= nblk; 780 blkno += nblk; 781 va += nblk * sc->sc_secsize; 782 } 783 784 dumping = 0; 785 return (0); 786 } 787 788 /* 789 * Adjust the size of a transfer. 790 */ 791 static void 792 ldminphys(struct buf *bp) 793 { 794 struct ld_softc *sc; 795 796 sc = device_lookup(&ld_cd, DISKUNIT(bp->b_dev)); 797 798 if (bp->b_bcount > sc->sc_maxxfer) 799 bp->b_bcount = sc->sc_maxxfer; 800 minphys(bp); 801 } 802
Indexes created Tue Sep 23 14:10:03 GMT 2025