ld.c revision 1.4
1 /* $NetBSD: ld.c,v 1.4 2001/01/07 18:09:01 fvdl 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 "rnd.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/kernel.h> 48 #include <sys/device.h> 49 #include <sys/queue.h> 50 #include <sys/proc.h> 51 #include <sys/buf.h> 52 #include <sys/endian.h> 53 #include <sys/disklabel.h> 54 #include <sys/disk.h> 55 #include <sys/dkio.h> 56 #include <sys/stat.h> 57 #include <sys/lock.h> 58 #include <sys/conf.h> 59 #include <sys/fcntl.h> 60 #include <sys/vnode.h> 61 #include <sys/syslog.h> 62 #if NRND > 0 63 #include <sys/rnd.h> 64 #endif 65 66 #include <dev/ldvar.h> 67 68 static void ldgetdefaultlabel(struct ld_softc *, struct disklabel *); 69 static void ldgetdisklabel(struct ld_softc *); 70 static int ldlock(struct ld_softc *); 71 static void ldminphys(struct buf *bp); 72 static void ldshutdown(void *); 73 static int ldstart(struct ld_softc *, struct buf *); 74 static void ldunlock(struct ld_softc *); 75 76 extern struct cfdriver ld_cd; 77 78 static struct dkdriver lddkdriver = { ldstrategy }; 79 static void *ld_sdh; 80 81 void 82 ldattach(struct ld_softc *sc) 83 { 84 char buf[9]; 85 86 /* Initialise and attach the disk structure. */ 87 sc->sc_dk.dk_driver = &lddkdriver; 88 sc->sc_dk.dk_name = sc->sc_dv.dv_xname; 89 disk_attach(&sc->sc_dk); 90 91 if ((sc->sc_flags & LDF_ENABLED) == 0) { 92 printf("%s: disabled\n", sc->sc_dv.dv_xname); 93 return; 94 } 95 if (sc->sc_maxxfer > MAXPHYS) 96 sc->sc_maxxfer = MAXPHYS; 97 98 format_bytes(buf, sizeof(buf), (u_int64_t)sc->sc_secperunit * 99 sc->sc_secsize); 100 printf("%s: %s, %d cyl, %d head, %d sec, %d bytes/sect x %d sectors\n", 101 sc->sc_dv.dv_xname, buf, sc->sc_ncylinders, sc->sc_nheads, 102 sc->sc_nsectors, sc->sc_secsize, sc->sc_secperunit); 103 104 #if NRND > 0 105 /* Attach the device into the rnd source list. */ 106 rnd_attach_source(&sc->sc_rnd_source, sc->sc_dv.dv_xname, 107 RND_TYPE_DISK, 0); 108 #endif 109 110 /* Set the `shutdownhook'. */ 111 if (ld_sdh == NULL) 112 ld_sdh = shutdownhook_establish(ldshutdown, NULL); 113 BUFQ_INIT(&sc->sc_bufq); 114 } 115 116 int 117 lddrain(struct ld_softc *sc, int flags) 118 { 119 int s; 120 121 if ((flags & DETACH_FORCE) == 0 && sc->sc_dk.dk_openmask != 0) 122 return (EBUSY); 123 124 s = splbio(); 125 sc->sc_flags |= LDF_DRAIN; 126 splx(s); 127 return (0); 128 } 129 130 void 131 lddetach(struct ld_softc *sc) 132 { 133 struct buf *bp; 134 int s, bmaj, cmaj, mn; 135 136 /* Wait for commands queued with the hardware to complete. */ 137 if (sc->sc_queuecnt != 0) 138 tsleep(&sc->sc_queuecnt, PRIBIO, "lddrn", 30 * hz); 139 140 /* Locate the major numbers. */ 141 for (bmaj = 0; bmaj <= nblkdev; bmaj++) 142 if (bdevsw[bmaj].d_open == sdopen) 143 break; 144 for (cmaj = 0; cmaj <= nchrdev; cmaj++) 145 if (cdevsw[cmaj].d_open == sdopen) 146 break; 147 148 /* Kill off any queued buffers. */ 149 s = splbio(); 150 while ((bp = BUFQ_FIRST(&sc->sc_bufq)) != NULL) { 151 BUFQ_REMOVE(&sc->sc_bufq, bp); 152 bp->b_error = EIO; 153 bp->b_flags |= B_ERROR; 154 bp->b_resid = bp->b_bcount; 155 biodone(bp); 156 } 157 splx(s); 158 159 /* Nuke the vnodes for any open instances. */ 160 mn = DISKUNIT(sc->sc_dv.dv_unit); 161 vdevgone(bmaj, mn, mn + (MAXPARTITIONS - 1), VBLK); 162 vdevgone(cmaj, mn, mn + (MAXPARTITIONS - 1), VCHR); 163 164 /* Detach from the disk list. */ 165 disk_detach(&sc->sc_dk); 166 167 #if NRND > 0 168 /* Unhook the entropy source. */ 169 rnd_detach_source(&sc->sc_rnd_source); 170 #endif 171 172 /* Flush the device's cache. */ 173 if (sc->sc_flush != NULL) 174 if ((*sc->sc_flush)(sc) != 0) 175 printf("%s: unable to flush cache\n", 176 sc->sc_dv.dv_xname); 177 } 178 179 static void 180 ldshutdown(void *cookie) 181 { 182 struct ld_softc *sc; 183 int i; 184 185 for (i = 0; i < ld_cd.cd_ndevs; i++) { 186 if ((sc = device_lookup(&ld_cd, i)) == NULL) 187 continue; 188 if (sc->sc_flush != NULL && (*sc->sc_flush)(sc) != 0) 189 printf("%s: unable to flush cache\n", 190 sc->sc_dv.dv_xname); 191 } 192 } 193 194 int 195 ldopen(dev_t dev, int flags, int fmt, struct proc *p) 196 { 197 struct ld_softc *sc; 198 int unit, part; 199 200 unit = DISKUNIT(dev); 201 if ((sc = device_lookup(&ld_cd, unit))== NULL) 202 return (ENXIO); 203 if ((sc->sc_flags & LDF_ENABLED) == 0) 204 return (ENODEV); 205 part = DISKPART(dev); 206 ldlock(sc); 207 208 if (sc->sc_dk.dk_openmask == 0) 209 ldgetdisklabel(sc); 210 211 /* Check that the partition exists. */ 212 if (part != RAW_PART && (part >= sc->sc_dk.dk_label->d_npartitions || 213 sc->sc_dk.dk_label->d_partitions[part].p_fstype == FS_UNUSED)) { 214 ldunlock(sc); 215 return (ENXIO); 216 } 217 218 /* Ensure only one open at a time. */ 219 switch (fmt) { 220 case S_IFCHR: 221 sc->sc_dk.dk_copenmask |= (1 << part); 222 break; 223 case S_IFBLK: 224 sc->sc_dk.dk_bopenmask |= (1 << part); 225 break; 226 } 227 sc->sc_dk.dk_openmask = 228 sc->sc_dk.dk_copenmask | sc->sc_dk.dk_bopenmask; 229 230 ldunlock(sc); 231 return (0); 232 } 233 234 int 235 ldclose(dev_t dev, int flags, int fmt, struct proc *p) 236 { 237 struct ld_softc *sc; 238 int part, unit; 239 240 unit = DISKUNIT(dev); 241 part = DISKPART(dev); 242 sc = device_lookup(&ld_cd, unit); 243 ldlock(sc); 244 245 switch (fmt) { 246 case S_IFCHR: 247 sc->sc_dk.dk_copenmask &= ~(1 << part); 248 break; 249 case S_IFBLK: 250 sc->sc_dk.dk_bopenmask &= ~(1 << part); 251 break; 252 } 253 sc->sc_dk.dk_openmask = 254 sc->sc_dk.dk_copenmask | sc->sc_dk.dk_bopenmask; 255 256 if (sc->sc_dk.dk_openmask == 0 && sc->sc_flush != NULL) 257 if ((*sc->sc_flush)(sc) != 0) 258 printf("%s: unable to flush cache\n", 259 sc->sc_dv.dv_xname); 260 261 ldunlock(sc); 262 return (0); 263 } 264 265 int 266 ldread(dev_t dev, struct uio *uio, int ioflag) 267 { 268 269 return (physio(ldstrategy, NULL, dev, B_READ, ldminphys, uio)); 270 } 271 272 int 273 ldwrite(dev_t dev, struct uio *uio, int ioflag) 274 { 275 276 return (physio(ldstrategy, NULL, dev, B_WRITE, ldminphys, uio)); 277 } 278 279 int 280 ldioctl(dev_t dev, u_long cmd, caddr_t addr, int32_t flag, struct proc *p) 281 { 282 struct ld_softc *sc; 283 int part, unit, error; 284 #ifdef __HAVE_OLD_DISKLABEL 285 struct disklabel newlabel, *lp; 286 #endif 287 288 unit = DISKUNIT(dev); 289 part = DISKPART(dev); 290 sc = device_lookup(&ld_cd, unit); 291 error = 0; 292 293 switch (cmd) { 294 case DIOCGDINFO: 295 memcpy(addr, sc->sc_dk.dk_label, sizeof(struct disklabel)); 296 return (0); 297 298 #ifdef __HAVE_OLD_DISKLABEL 299 case ODIOCGDINFO: 300 newlabel = *(sc->sc_dk.dk_label); 301 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 302 newlabel.d_npartitions = OLDMAXPARTITIONS; 303 memcpy(addr, &newlabel, sizeof(struct olddisklabel)); 304 return (0); 305 #endif 306 307 case DIOCGPART: 308 ((struct partinfo *)addr)->disklab = sc->sc_dk.dk_label; 309 ((struct partinfo *)addr)->part = 310 &sc->sc_dk.dk_label->d_partitions[part]; 311 break; 312 313 case DIOCWDINFO: 314 case DIOCSDINFO: 315 #ifdef __HAVE_OLD_DISKLABEL 316 case ODIOCWDINFO: 317 case ODIOCSDINFO: 318 319 if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) { 320 memset(&newlabel, 0, sizeof newlabel); 321 memcpy(&newlabel, addr, sizeof (struct olddisklabel)); 322 lp = &newlabel; 323 } else 324 #endif 325 lp = (struct disklabel *)addr; 326 327 if ((flag & FWRITE) == 0) 328 return (EBADF); 329 330 if ((error = ldlock(sc)) != 0) 331 return (error); 332 sc->sc_flags |= LDF_LABELLING; 333 334 error = setdisklabel(sc->sc_dk.dk_label, 335 lp, /*sc->sc_dk.dk_openmask : */0, 336 sc->sc_dk.dk_cpulabel); 337 if (error == 0 && (cmd == DIOCWDINFO 338 #ifdef __HAVE_OLD_DISKLABEL 339 || cmd == ODIOCWDINFO 340 #endif 341 )) 342 error = writedisklabel( 343 MAKEDISKDEV(major(dev), DISKUNIT(dev), RAW_PART), 344 ldstrategy, sc->sc_dk.dk_label, 345 sc->sc_dk.dk_cpulabel); 346 347 sc->sc_flags &= ~LDF_LABELLING; 348 ldunlock(sc); 349 break; 350 351 case DIOCWLABEL: 352 if ((flag & FWRITE) == 0) 353 return (EBADF); 354 if (*(int *)addr) 355 sc->sc_flags |= LDF_WLABEL; 356 else 357 sc->sc_flags &= ~LDF_WLABEL; 358 break; 359 360 case DIOCGDEFLABEL: 361 ldgetdefaultlabel(sc, (struct disklabel *)addr); 362 break; 363 364 #ifdef __HAVE_OLD_DISKLABEL 365 case ODIOCGDEFLABEL: 366 ldgetdefaultlabel(sc, &newlabel); 367 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 368 newlabel.d_npartitions = OLDMAXPARTITIONS; 369 memcpy(addr, &newlabel, sizeof (struct olddisklabel)); 370 break; 371 #endif 372 373 default: 374 error = ENOTTY; 375 break; 376 } 377 378 return (error); 379 } 380 381 void 382 ldstrategy(struct buf *bp) 383 { 384 struct ld_softc *sc; 385 int s; 386 387 sc = device_lookup(&ld_cd, DISKUNIT(bp->b_dev)); 388 389 s = splbio(); 390 if (sc->sc_queuecnt == sc->sc_maxqueuecnt) { 391 BUFQ_INSERT_TAIL(&sc->sc_bufq, bp); 392 splx(s); 393 return; 394 } 395 splx(s); 396 ldstart(sc, bp); 397 } 398 399 static int 400 ldstart(struct ld_softc *sc, struct buf *bp) 401 { 402 struct disklabel *lp; 403 int part, s, rv; 404 405 if ((sc->sc_flags & LDF_DRAIN) != 0) { 406 bp->b_error = EIO; 407 bp->b_flags |= B_ERROR; 408 bp->b_resid = bp->b_bcount; 409 biodone(bp); 410 return (-1); 411 } 412 413 part = DISKPART(bp->b_dev); 414 lp = sc->sc_dk.dk_label; 415 416 /* 417 * The transfer must be a whole number of blocks and the offset must 418 * not be negative. 419 */ 420 if ((bp->b_bcount % lp->d_secsize) != 0 || bp->b_blkno < 0) { 421 bp->b_flags |= B_ERROR; 422 biodone(bp); 423 return (-1); 424 } 425 426 /* 427 * If it's a null transfer, return. 428 */ 429 if (bp->b_bcount == 0) { 430 bp->b_resid = bp->b_bcount; 431 biodone(bp); 432 return (-1); 433 } 434 435 /* 436 * Do bounds checking and adjust the transfer. If error, process. 437 * If past the end of partition, just return. 438 */ 439 if (part != RAW_PART && 440 bounds_check_with_label(bp, lp, 441 (sc->sc_flags & (LDF_WLABEL | LDF_LABELLING)) != 0) <= 0) { 442 bp->b_resid = bp->b_bcount; 443 biodone(bp); 444 return (-1); 445 } 446 447 /* 448 * Convert the logical block number to a physical one and put it in 449 * terms of the device's logical block size. 450 */ 451 if (lp->d_secsize >= DEV_BSIZE) 452 bp->b_rawblkno = bp->b_blkno / (lp->d_secsize / DEV_BSIZE); 453 else 454 bp->b_rawblkno = bp->b_blkno * (DEV_BSIZE / lp->d_secsize); 455 456 if (bp->b_dev != RAW_PART) 457 bp->b_rawblkno += lp->d_partitions[part].p_offset; 458 459 s = splbio(); 460 disk_busy(&sc->sc_dk); 461 sc->sc_queuecnt++; 462 splx(s); 463 464 if ((rv = (*sc->sc_start)(sc, bp)) != 0) { 465 bp->b_error = rv; 466 bp->b_flags |= B_ERROR; 467 bp->b_resid = bp->b_bcount; 468 s = splbio(); 469 lddone(sc, bp); 470 splx(s); 471 } 472 473 return (0); 474 } 475 476 void 477 lddone(struct ld_softc *sc, struct buf *bp) 478 { 479 480 if ((bp->b_flags & B_ERROR) != 0) { 481 diskerr(bp, "ld", "error", LOG_PRINTF, 0, sc->sc_dk.dk_label); 482 printf("\n"); 483 } 484 485 disk_unbusy(&sc->sc_dk, bp->b_bcount - bp->b_resid); 486 #if NRND > 0 487 rnd_add_uint32(&sc->sc_rnd_source, bp->b_rawblkno); 488 #endif 489 biodone(bp); 490 if (--sc->sc_queuecnt == 0 && (sc->sc_flags & LDF_DRAIN) != 0) 491 wakeup(&sc->sc_queuecnt); 492 493 while ((bp = BUFQ_FIRST(&sc->sc_bufq)) != NULL) { 494 BUFQ_REMOVE(&sc->sc_bufq, bp); 495 if (!ldstart(sc, bp)) 496 break; 497 } 498 } 499 500 int 501 ldsize(dev_t dev) 502 { 503 struct ld_softc *sc; 504 int part, unit, omask, size; 505 506 unit = DISKUNIT(dev); 507 if ((sc = device_lookup(&ld_cd, unit)) == NULL) 508 return (ENODEV); 509 if ((sc->sc_flags & LDF_ENABLED) == 0) 510 return (ENODEV); 511 part = DISKPART(dev); 512 513 omask = sc->sc_dk.dk_openmask & (1 << part); 514 515 if (omask == 0 && ldopen(dev, 0, S_IFBLK, NULL) != 0) 516 return (-1); 517 else if (sc->sc_dk.dk_label->d_partitions[part].p_fstype != FS_SWAP) 518 size = -1; 519 else 520 size = sc->sc_dk.dk_label->d_partitions[part].p_size * 521 (sc->sc_dk.dk_label->d_secsize / DEV_BSIZE); 522 if (omask == 0 && ldclose(dev, 0, S_IFBLK, NULL) != 0) 523 return (-1); 524 525 return (size); 526 } 527 528 /* 529 * Load the label information from the specified device. 530 */ 531 static void 532 ldgetdisklabel(struct ld_softc *sc) 533 { 534 const char *errstring; 535 536 ldgetdefaultlabel(sc, sc->sc_dk.dk_label); 537 538 /* Call the generic disklabel extraction routine. */ 539 errstring = readdisklabel(MAKEDISKDEV(0, sc->sc_dv.dv_unit, RAW_PART), 540 ldstrategy, sc->sc_dk.dk_label, sc->sc_dk.dk_cpulabel); 541 if (errstring != NULL) 542 printf("%s: %s\n", sc->sc_dv.dv_xname, errstring); 543 } 544 545 /* 546 * Construct a ficticious label. 547 */ 548 static void 549 ldgetdefaultlabel(struct ld_softc *sc, struct disklabel *lp) 550 { 551 552 memset(lp, 0, sizeof(struct disklabel)); 553 554 lp->d_secsize = sc->sc_secsize; 555 lp->d_ntracks = sc->sc_nheads; 556 lp->d_nsectors = sc->sc_nsectors; 557 lp->d_ncylinders = sc->sc_ncylinders; 558 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 559 lp->d_type = DTYPE_LD; 560 strcpy(lp->d_typename, "unknown"); 561 strcpy(lp->d_packname, "fictitious"); 562 lp->d_secperunit = sc->sc_secperunit; 563 lp->d_rpm = 7200; 564 lp->d_interleave = 1; 565 lp->d_flags = 0; 566 567 lp->d_partitions[RAW_PART].p_offset = 0; 568 lp->d_partitions[RAW_PART].p_size = 569 lp->d_secperunit * (lp->d_secsize / DEV_BSIZE); 570 lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED; 571 lp->d_npartitions = RAW_PART + 1; 572 573 lp->d_magic = DISKMAGIC; 574 lp->d_magic2 = DISKMAGIC; 575 lp->d_checksum = dkcksum(lp); 576 } 577 578 /* 579 * Wait interruptibly for an exclusive lock. 580 * 581 * XXX Several drivers do this; it should be abstracted and made MP-safe. 582 */ 583 static int 584 ldlock(struct ld_softc *sc) 585 { 586 int error; 587 588 while ((sc->sc_flags & LDF_LKHELD) != 0) { 589 sc->sc_flags |= LDF_LKWANTED; 590 if ((error = tsleep(sc, PRIBIO | PCATCH, "ldlck", 0)) != 0) 591 return (error); 592 } 593 sc->sc_flags |= LDF_LKHELD; 594 return (0); 595 } 596 597 /* 598 * Unlock and wake up any waiters. 599 */ 600 static void 601 ldunlock(struct ld_softc *sc) 602 { 603 604 sc->sc_flags &= ~LDF_LKHELD; 605 if ((sc->sc_flags & LDF_LKWANTED) != 0) { 606 sc->sc_flags &= ~LDF_LKWANTED; 607 wakeup(sc); 608 } 609 } 610 611 /* 612 * Take a dump. 613 */ 614 int 615 lddump(dev_t dev, daddr_t blkno, caddr_t va, size_t size) 616 { 617 struct ld_softc *sc; 618 struct disklabel *lp; 619 int unit, part, nsects, sectoff, towrt, nblk, maxblkcnt, rv; 620 static int dumping; 621 622 unit = DISKUNIT(dev); 623 if ((sc = device_lookup(&ld_cd, unit)) == NULL) 624 return (ENXIO); 625 if ((sc->sc_flags & LDF_ENABLED) == 0) 626 return (ENODEV); 627 if (sc->sc_dump == NULL) 628 return (ENXIO); 629 630 /* Check if recursive dump; if so, punt. */ 631 if (dumping) 632 return (EFAULT); 633 dumping = 1; 634 635 /* Convert to disk sectors. Request must be a multiple of size. */ 636 part = DISKPART(dev); 637 lp = sc->sc_dk.dk_label; 638 if ((size % lp->d_secsize) != 0) 639 return (EFAULT); 640 towrt = size / lp->d_secsize; 641 blkno = dbtob(blkno) / lp->d_secsize; /* blkno in DEV_BSIZE units */ 642 643 nsects = lp->d_partitions[part].p_size; 644 sectoff = lp->d_partitions[part].p_offset; 645 646 /* Check transfer bounds against partition size. */ 647 if ((blkno < 0) || ((blkno + towrt) > nsects)) 648 return (EINVAL); 649 650 /* Offset block number to start of partition. */ 651 blkno += sectoff; 652 653 /* Start dumping and return when done. */ 654 maxblkcnt = sc->sc_maxxfer / sc->sc_secsize - 1; 655 while (towrt > 0) { 656 nblk = min(maxblkcnt, towrt); 657 658 if ((rv = (*sc->sc_dump)(sc, va, blkno, nblk)) != 0) 659 return (rv); 660 661 towrt -= nblk; 662 blkno += nblk; 663 va += nblk * sc->sc_secsize; 664 } 665 666 dumping = 0; 667 return (0); 668 } 669 670 /* 671 * Adjust the size of a transfer. 672 */ 673 static void 674 ldminphys(struct buf *bp) 675 { 676 struct ld_softc *sc; 677 678 sc = device_lookup(&ld_cd, DISKUNIT(bp->b_dev)); 679 680 if (bp->b_bcount > sc->sc_maxxfer) 681 bp->b_bcount = sc->sc_maxxfer; 682 minphys(bp); 683 } 684
Indexes created Thu Sep 25 08:09:54 GMT 2025