ld.c revision 1.13
1 /* $NetBSD: ld.c,v 1.13 2002/05/08 15:49:07 drochner 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 1.13 2002/05/08 15:49:07 drochner 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 int ldstart(struct ld_softc *, struct buf *); 77 static void ldunlock(struct ld_softc *); 78 79 extern struct cfdriver ld_cd; 80 81 static struct dkdriver lddkdriver = { ldstrategy }; 82 static void *ld_sdh; 83 84 void 85 ldattach(struct ld_softc *sc) 86 { 87 char buf[9]; 88 89 if ((sc->sc_flags & LDF_ENABLED) == 0) { 90 printf("%s: disabled\n", sc->sc_dv.dv_xname); 91 return; 92 } 93 94 /* Initialise and attach the disk structure. */ 95 sc->sc_dk.dk_driver = &lddkdriver; 96 sc->sc_dk.dk_name = sc->sc_dv.dv_xname; 97 disk_attach(&sc->sc_dk); 98 99 if (sc->sc_maxxfer > MAXPHYS) 100 sc->sc_maxxfer = MAXPHYS; 101 102 /* Build synthetic geometry. */ 103 if (sc->sc_secperunit <= 528 * 2048) /* 528MB */ 104 sc->sc_nheads = 16; 105 else if (sc->sc_secperunit <= 1024 * 2048) /* 1GB */ 106 sc->sc_nheads = 32; 107 else if (sc->sc_secperunit <= 21504 * 2048) /* 21GB */ 108 sc->sc_nheads = 64; 109 else if (sc->sc_secperunit <= 43008 * 2048) /* 42GB */ 110 sc->sc_nheads = 128; 111 else 112 sc->sc_nheads = 255; 113 114 sc->sc_nsectors = 63; 115 sc->sc_ncylinders = sc->sc_secperunit / 116 (sc->sc_nheads * sc->sc_nsectors); 117 118 format_bytes(buf, sizeof(buf), (u_int64_t)sc->sc_secperunit * 119 sc->sc_secsize); 120 printf("%s: %s, %d cyl, %d head, %d sec, %d bytes/sect x %d sectors\n", 121 sc->sc_dv.dv_xname, buf, sc->sc_ncylinders, sc->sc_nheads, 122 sc->sc_nsectors, sc->sc_secsize, sc->sc_secperunit); 123 124 #if NRND > 0 125 /* Attach the device into the rnd source list. */ 126 rnd_attach_source(&sc->sc_rnd_source, sc->sc_dv.dv_xname, 127 RND_TYPE_DISK, 0); 128 #endif 129 130 /* Set the `shutdownhook'. */ 131 if (ld_sdh == NULL) 132 ld_sdh = shutdownhook_establish(ldshutdown, NULL); 133 BUFQ_INIT(&sc->sc_bufq); 134 } 135 136 int 137 ldadjqparam(struct ld_softc *sc, int max) 138 { 139 int s, rv; 140 141 s = splbio(); 142 sc->sc_maxqueuecnt = max; 143 if (sc->sc_queuecnt > max) { 144 sc->sc_flags |= LDF_DRAIN; 145 rv = tsleep(&sc->sc_queuecnt, PRIBIO, "lddrn", 30 * hz); 146 sc->sc_flags &= ~LDF_DRAIN; 147 } else 148 rv = 0; 149 splx(s); 150 151 return (rv); 152 } 153 154 int 155 ldbegindetach(struct ld_softc *sc, int flags) 156 { 157 int s, rv; 158 159 if ((sc->sc_flags & LDF_ENABLED) == 0) 160 return (0); 161 162 if ((flags & DETACH_FORCE) == 0 && sc->sc_dk.dk_openmask != 0) 163 return (EBUSY); 164 165 s = splbio(); 166 sc->sc_flags |= LDF_DETACH; 167 rv = ldadjqparam(sc, 0); 168 splx(s); 169 170 return (rv); 171 } 172 173 void 174 ldenddetach(struct ld_softc *sc) 175 { 176 struct buf *bp; 177 int s, bmaj, cmaj, i, mn; 178 179 if ((sc->sc_flags & LDF_ENABLED) == 0) 180 return; 181 182 /* Wait for commands queued with the hardware to complete. */ 183 if (sc->sc_queuecnt != 0) 184 if (tsleep(&sc->sc_queuecnt, PRIBIO, "lddtch", 30 * hz)) 185 printf("%s: not drained\n", sc->sc_dv.dv_xname); 186 187 /* Locate the major numbers. */ 188 for (bmaj = 0; bmaj <= nblkdev; bmaj++) 189 if (bdevsw[bmaj].d_open == ldopen) 190 break; 191 for (cmaj = 0; cmaj <= nchrdev; cmaj++) 192 if (cdevsw[cmaj].d_open == ldopen) 193 break; 194 195 /* Kill off any queued buffers. */ 196 s = splbio(); 197 while ((bp = BUFQ_FIRST(&sc->sc_bufq)) != NULL) { 198 BUFQ_REMOVE(&sc->sc_bufq, bp); 199 bp->b_error = EIO; 200 bp->b_flags |= B_ERROR; 201 bp->b_resid = bp->b_bcount; 202 biodone(bp); 203 } 204 splx(s); 205 206 /* Nuke the vnodes for any open instances. */ 207 for (i = 0; i < MAXPARTITIONS; i++) { 208 mn = DISKMINOR(sc->sc_dv.dv_unit, i); 209 vdevgone(bmaj, mn, mn, VBLK); 210 vdevgone(cmaj, mn, mn, VCHR); 211 } 212 213 /* Detach from the disk list. */ 214 disk_detach(&sc->sc_dk); 215 216 #if NRND > 0 217 /* Unhook the entropy source. */ 218 rnd_detach_source(&sc->sc_rnd_source); 219 #endif 220 221 /* Flush the device's cache. */ 222 if (sc->sc_flush != NULL) 223 if ((*sc->sc_flush)(sc) != 0) 224 printf("%s: unable to flush cache\n", 225 sc->sc_dv.dv_xname); 226 } 227 228 /* ARGSUSED */ 229 static void 230 ldshutdown(void *cookie) 231 { 232 struct ld_softc *sc; 233 int i; 234 235 for (i = 0; i < ld_cd.cd_ndevs; i++) { 236 if ((sc = device_lookup(&ld_cd, i)) == NULL) 237 continue; 238 if (sc->sc_flush != NULL && (*sc->sc_flush)(sc) != 0) 239 printf("%s: unable to flush cache\n", 240 sc->sc_dv.dv_xname); 241 } 242 } 243 244 /* ARGSUSED */ 245 int 246 ldopen(dev_t dev, int flags, int fmt, struct proc *p) 247 { 248 struct ld_softc *sc; 249 int unit, part; 250 251 unit = DISKUNIT(dev); 252 if ((sc = device_lookup(&ld_cd, unit))== NULL) 253 return (ENXIO); 254 if ((sc->sc_flags & LDF_ENABLED) == 0) 255 return (ENODEV); 256 part = DISKPART(dev); 257 ldlock(sc); 258 259 if (sc->sc_dk.dk_openmask == 0) 260 ldgetdisklabel(sc); 261 262 /* Check that the partition exists. */ 263 if (part != RAW_PART && (part >= sc->sc_dk.dk_label->d_npartitions || 264 sc->sc_dk.dk_label->d_partitions[part].p_fstype == FS_UNUSED)) { 265 ldunlock(sc); 266 return (ENXIO); 267 } 268 269 /* Ensure only one open at a time. */ 270 switch (fmt) { 271 case S_IFCHR: 272 sc->sc_dk.dk_copenmask |= (1 << part); 273 break; 274 case S_IFBLK: 275 sc->sc_dk.dk_bopenmask |= (1 << part); 276 break; 277 } 278 sc->sc_dk.dk_openmask = 279 sc->sc_dk.dk_copenmask | sc->sc_dk.dk_bopenmask; 280 281 ldunlock(sc); 282 return (0); 283 } 284 285 /* ARGSUSED */ 286 int 287 ldclose(dev_t dev, int flags, int fmt, struct proc *p) 288 { 289 struct ld_softc *sc; 290 int part, unit; 291 292 unit = DISKUNIT(dev); 293 part = DISKPART(dev); 294 sc = device_lookup(&ld_cd, unit); 295 ldlock(sc); 296 297 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 if (sc->sc_dk.dk_openmask == 0 && sc->sc_flush != NULL) 309 if ((*sc->sc_flush)(sc) != 0) 310 printf("%s: unable to flush cache\n", 311 sc->sc_dv.dv_xname); 312 313 ldunlock(sc); 314 return (0); 315 } 316 317 /* ARGSUSED */ 318 int 319 ldread(dev_t dev, struct uio *uio, int ioflag) 320 { 321 322 return (physio(ldstrategy, NULL, dev, B_READ, ldminphys, uio)); 323 } 324 325 /* ARGSUSED */ 326 int 327 ldwrite(dev_t dev, struct uio *uio, int ioflag) 328 { 329 330 return (physio(ldstrategy, NULL, dev, B_WRITE, ldminphys, uio)); 331 } 332 333 /* ARGSUSED */ 334 int 335 ldioctl(dev_t dev, u_long cmd, caddr_t addr, int32_t flag, struct proc *p) 336 { 337 struct ld_softc *sc; 338 int part, unit, error; 339 #ifdef __HAVE_OLD_DISKLABEL 340 struct disklabel newlabel; 341 #endif 342 struct disklabel *lp; 343 344 unit = DISKUNIT(dev); 345 part = DISKPART(dev); 346 sc = device_lookup(&ld_cd, unit); 347 error = 0; 348 349 switch (cmd) { 350 case DIOCGDINFO: 351 memcpy(addr, sc->sc_dk.dk_label, sizeof(struct disklabel)); 352 return (0); 353 354 #ifdef __HAVE_OLD_DISKLABEL 355 case ODIOCGDINFO: 356 newlabel = *(sc->sc_dk.dk_label); 357 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 358 return ENOTTY; 359 memcpy(addr, &newlabel, sizeof(struct olddisklabel)); 360 return (0); 361 #endif 362 363 case DIOCGPART: 364 ((struct partinfo *)addr)->disklab = sc->sc_dk.dk_label; 365 ((struct partinfo *)addr)->part = 366 &sc->sc_dk.dk_label->d_partitions[part]; 367 break; 368 369 case DIOCWDINFO: 370 case DIOCSDINFO: 371 #ifdef __HAVE_OLD_DISKLABEL 372 case ODIOCWDINFO: 373 case ODIOCSDINFO: 374 375 if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) { 376 memset(&newlabel, 0, sizeof newlabel); 377 memcpy(&newlabel, addr, sizeof (struct olddisklabel)); 378 lp = &newlabel; 379 } else 380 #endif 381 lp = (struct disklabel *)addr; 382 383 if ((flag & FWRITE) == 0) 384 return (EBADF); 385 386 if ((error = ldlock(sc)) != 0) 387 return (error); 388 sc->sc_flags |= LDF_LABELLING; 389 390 error = setdisklabel(sc->sc_dk.dk_label, 391 lp, /*sc->sc_dk.dk_openmask : */0, 392 sc->sc_dk.dk_cpulabel); 393 if (error == 0 && (cmd == DIOCWDINFO 394 #ifdef __HAVE_OLD_DISKLABEL 395 || cmd == ODIOCWDINFO 396 #endif 397 )) 398 error = writedisklabel( 399 MAKEDISKDEV(major(dev), DISKUNIT(dev), RAW_PART), 400 ldstrategy, sc->sc_dk.dk_label, 401 sc->sc_dk.dk_cpulabel); 402 403 sc->sc_flags &= ~LDF_LABELLING; 404 ldunlock(sc); 405 break; 406 407 case DIOCWLABEL: 408 if ((flag & FWRITE) == 0) 409 return (EBADF); 410 if (*(int *)addr) 411 sc->sc_flags |= LDF_WLABEL; 412 else 413 sc->sc_flags &= ~LDF_WLABEL; 414 break; 415 416 case DIOCGDEFLABEL: 417 ldgetdefaultlabel(sc, (struct disklabel *)addr); 418 break; 419 420 #ifdef __HAVE_OLD_DISKLABEL 421 case ODIOCGDEFLABEL: 422 ldgetdefaultlabel(sc, &newlabel); 423 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 424 return ENOTTY; 425 memcpy(addr, &newlabel, sizeof (struct olddisklabel)); 426 break; 427 #endif 428 429 default: 430 error = ENOTTY; 431 break; 432 } 433 434 return (error); 435 } 436 437 void 438 ldstrategy(struct buf *bp) 439 { 440 struct ld_softc *sc; 441 int s; 442 443 sc = device_lookup(&ld_cd, DISKUNIT(bp->b_dev)); 444 445 s = splbio(); 446 if (sc->sc_queuecnt >= sc->sc_maxqueuecnt) { 447 BUFQ_INSERT_TAIL(&sc->sc_bufq, bp); 448 splx(s); 449 return; 450 } 451 splx(s); 452 ldstart(sc, bp); 453 } 454 455 static int 456 ldstart(struct ld_softc *sc, struct buf *bp) 457 { 458 struct disklabel *lp; 459 int part, s, rv; 460 461 if ((sc->sc_flags & LDF_DETACH) != 0) { 462 bp->b_error = EIO; 463 bp->b_flags |= B_ERROR; 464 bp->b_resid = bp->b_bcount; 465 biodone(bp); 466 return (-1); 467 } 468 469 part = DISKPART(bp->b_dev); 470 lp = sc->sc_dk.dk_label; 471 472 /* 473 * The transfer must be a whole number of blocks and the offset must 474 * not be negative. 475 */ 476 if ((bp->b_bcount % lp->d_secsize) != 0 || bp->b_blkno < 0) { 477 bp->b_flags |= B_ERROR; 478 biodone(bp); 479 return (-1); 480 } 481 482 /* 483 * If it's a null transfer, return. 484 */ 485 if (bp->b_bcount == 0) { 486 bp->b_resid = bp->b_bcount; 487 biodone(bp); 488 return (-1); 489 } 490 491 /* 492 * Do bounds checking and adjust the transfer. If error, process. 493 * If past the end of partition, just return. 494 */ 495 if (part != RAW_PART && 496 bounds_check_with_label(bp, lp, 497 (sc->sc_flags & (LDF_WLABEL | LDF_LABELLING)) != 0) <= 0) { 498 bp->b_resid = bp->b_bcount; 499 biodone(bp); 500 return (-1); 501 } 502 503 /* 504 * Convert the logical block number to a physical one and put it in 505 * terms of the device's logical block size. 506 */ 507 if (lp->d_secsize >= DEV_BSIZE) 508 bp->b_rawblkno = bp->b_blkno / (lp->d_secsize / DEV_BSIZE); 509 else 510 bp->b_rawblkno = bp->b_blkno * (DEV_BSIZE / lp->d_secsize); 511 512 if (part != RAW_PART) 513 bp->b_rawblkno += lp->d_partitions[part].p_offset; 514 515 s = splbio(); 516 disk_busy(&sc->sc_dk); 517 sc->sc_queuecnt++; 518 splx(s); 519 520 if ((rv = (*sc->sc_start)(sc, bp)) != 0) { 521 bp->b_error = rv; 522 bp->b_flags |= B_ERROR; 523 bp->b_resid = bp->b_bcount; 524 s = splbio(); 525 lddone(sc, bp); 526 splx(s); 527 } 528 529 return (0); 530 } 531 532 void 533 lddone(struct ld_softc *sc, struct buf *bp) 534 { 535 536 if ((bp->b_flags & B_ERROR) != 0) { 537 diskerr(bp, "ld", "error", LOG_PRINTF, 0, sc->sc_dk.dk_label); 538 printf("\n"); 539 } 540 541 disk_unbusy(&sc->sc_dk, bp->b_bcount - bp->b_resid); 542 #if NRND > 0 543 rnd_add_uint32(&sc->sc_rnd_source, bp->b_rawblkno); 544 #endif 545 biodone(bp); 546 547 if (--sc->sc_queuecnt <= sc->sc_maxqueuecnt) { 548 if ((sc->sc_flags & LDF_DRAIN) != 0) 549 wakeup(&sc->sc_queuecnt); 550 while ((bp = BUFQ_FIRST(&sc->sc_bufq)) != NULL) { 551 BUFQ_REMOVE(&sc->sc_bufq, bp); 552 if (!ldstart(sc, bp)) 553 break; 554 } 555 } 556 } 557 558 int 559 ldsize(dev_t dev) 560 { 561 struct ld_softc *sc; 562 int part, unit, omask, size; 563 564 unit = DISKUNIT(dev); 565 if ((sc = device_lookup(&ld_cd, unit)) == NULL) 566 return (ENODEV); 567 if ((sc->sc_flags & LDF_ENABLED) == 0) 568 return (ENODEV); 569 part = DISKPART(dev); 570 571 omask = sc->sc_dk.dk_openmask & (1 << part); 572 573 if (omask == 0 && ldopen(dev, 0, S_IFBLK, NULL) != 0) 574 return (-1); 575 else if (sc->sc_dk.dk_label->d_partitions[part].p_fstype != FS_SWAP) 576 size = -1; 577 else 578 size = sc->sc_dk.dk_label->d_partitions[part].p_size * 579 (sc->sc_dk.dk_label->d_secsize / DEV_BSIZE); 580 if (omask == 0 && ldclose(dev, 0, S_IFBLK, NULL) != 0) 581 return (-1); 582 583 return (size); 584 } 585 586 /* 587 * Load the label information from the specified device. 588 */ 589 static void 590 ldgetdisklabel(struct ld_softc *sc) 591 { 592 const char *errstring; 593 594 ldgetdefaultlabel(sc, sc->sc_dk.dk_label); 595 596 /* Call the generic disklabel extraction routine. */ 597 errstring = readdisklabel(MAKEDISKDEV(0, sc->sc_dv.dv_unit, RAW_PART), 598 ldstrategy, sc->sc_dk.dk_label, sc->sc_dk.dk_cpulabel); 599 if (errstring != NULL) 600 printf("%s: %s\n", sc->sc_dv.dv_xname, errstring); 601 } 602 603 /* 604 * Construct a ficticious label. 605 */ 606 static void 607 ldgetdefaultlabel(struct ld_softc *sc, struct disklabel *lp) 608 { 609 610 memset(lp, 0, sizeof(struct disklabel)); 611 612 lp->d_secsize = sc->sc_secsize; 613 lp->d_ntracks = sc->sc_nheads; 614 lp->d_nsectors = sc->sc_nsectors; 615 lp->d_ncylinders = sc->sc_ncylinders; 616 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 617 lp->d_type = DTYPE_LD; 618 strcpy(lp->d_typename, "unknown"); 619 strcpy(lp->d_packname, "fictitious"); 620 lp->d_secperunit = sc->sc_secperunit; 621 lp->d_rpm = 7200; 622 lp->d_interleave = 1; 623 lp->d_flags = 0; 624 625 lp->d_partitions[RAW_PART].p_offset = 0; 626 lp->d_partitions[RAW_PART].p_size = 627 lp->d_secperunit * (lp->d_secsize / DEV_BSIZE); 628 lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED; 629 lp->d_npartitions = RAW_PART + 1; 630 631 lp->d_magic = DISKMAGIC; 632 lp->d_magic2 = DISKMAGIC; 633 lp->d_checksum = dkcksum(lp); 634 } 635 636 /* 637 * Wait interruptibly for an exclusive lock. 638 * 639 * XXX Several drivers do this; it should be abstracted and made MP-safe. 640 */ 641 static int 642 ldlock(struct ld_softc *sc) 643 { 644 int error; 645 646 while ((sc->sc_flags & LDF_LKHELD) != 0) { 647 sc->sc_flags |= LDF_LKWANTED; 648 if ((error = tsleep(sc, PRIBIO | PCATCH, "ldlck", 0)) != 0) 649 return (error); 650 } 651 sc->sc_flags |= LDF_LKHELD; 652 return (0); 653 } 654 655 /* 656 * Unlock and wake up any waiters. 657 */ 658 static void 659 ldunlock(struct ld_softc *sc) 660 { 661 662 sc->sc_flags &= ~LDF_LKHELD; 663 if ((sc->sc_flags & LDF_LKWANTED) != 0) { 664 sc->sc_flags &= ~LDF_LKWANTED; 665 wakeup(sc); 666 } 667 } 668 669 /* 670 * Take a dump. 671 */ 672 int 673 lddump(dev_t dev, daddr_t blkno, caddr_t va, size_t size) 674 { 675 struct ld_softc *sc; 676 struct disklabel *lp; 677 int unit, part, nsects, sectoff, towrt, nblk, maxblkcnt, rv; 678 static int dumping; 679 680 unit = DISKUNIT(dev); 681 if ((sc = device_lookup(&ld_cd, unit)) == NULL) 682 return (ENXIO); 683 if ((sc->sc_flags & LDF_ENABLED) == 0) 684 return (ENODEV); 685 if (sc->sc_dump == NULL) 686 return (ENXIO); 687 688 /* Check if recursive dump; if so, punt. */ 689 if (dumping) 690 return (EFAULT); 691 dumping = 1; 692 693 /* Convert to disk sectors. Request must be a multiple of size. */ 694 part = DISKPART(dev); 695 lp = sc->sc_dk.dk_label; 696 if ((size % lp->d_secsize) != 0) 697 return (EFAULT); 698 towrt = size / lp->d_secsize; 699 blkno = dbtob(blkno) / lp->d_secsize; /* blkno in DEV_BSIZE units */ 700 701 nsects = lp->d_partitions[part].p_size; 702 sectoff = lp->d_partitions[part].p_offset; 703 704 /* Check transfer bounds against partition size. */ 705 if ((blkno < 0) || ((blkno + towrt) > nsects)) 706 return (EINVAL); 707 708 /* Offset block number to start of partition. */ 709 blkno += sectoff; 710 711 /* Start dumping and return when done. */ 712 maxblkcnt = sc->sc_maxxfer / sc->sc_secsize - 1; 713 while (towrt > 0) { 714 nblk = min(maxblkcnt, towrt); 715 716 if ((rv = (*sc->sc_dump)(sc, va, blkno, nblk)) != 0) 717 return (rv); 718 719 towrt -= nblk; 720 blkno += nblk; 721 va += nblk * sc->sc_secsize; 722 } 723 724 dumping = 0; 725 return (0); 726 } 727 728 /* 729 * Adjust the size of a transfer. 730 */ 731 static void 732 ldminphys(struct buf *bp) 733 { 734 struct ld_softc *sc; 735 736 sc = device_lookup(&ld_cd, DISKUNIT(bp->b_dev)); 737 738 if (bp->b_bcount > sc->sc_maxxfer) 739 bp->b_bcount = sc->sc_maxxfer; 740 minphys(bp); 741 } 742
Indexes created Tue Sep 23 14:10:03 GMT 2025