dksubr.c revision 1.93
1 /* $NetBSD: dksubr.c,v 1.93 2016/12/08 12:22:56 mlelstv Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 1997, 1998, 1999, 2002, 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe and Roland C. Dowdeswell. 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 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: dksubr.c,v 1.93 2016/12/08 12:22:56 mlelstv Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/stat.h> 38 #include <sys/proc.h> 39 #include <sys/ioctl.h> 40 #include <sys/device.h> 41 #include <sys/disk.h> 42 #include <sys/disklabel.h> 43 #include <sys/buf.h> 44 #include <sys/bufq.h> 45 #include <sys/vnode.h> 46 #include <sys/fcntl.h> 47 #include <sys/namei.h> 48 #include <sys/module.h> 49 #include <sys/syslog.h> 50 51 #include <dev/dkvar.h> 52 #include <miscfs/specfs/specdev.h> /* for v_rdev */ 53 54 int dkdebug = 0; 55 56 #ifdef DEBUG 57 #define DKDB_FOLLOW 0x1 58 #define DKDB_INIT 0x2 59 #define DKDB_VNODE 0x4 60 #define DKDB_DUMP 0x8 61 62 #define IFDEBUG(x,y) if (dkdebug & (x)) y 63 #define DPRINTF(x,y) IFDEBUG(x, printf y) 64 #define DPRINTF_FOLLOW(y) DPRINTF(DKDB_FOLLOW, y) 65 #else 66 #define IFDEBUG(x,y) 67 #define DPRINTF(x,y) 68 #define DPRINTF_FOLLOW(y) 69 #endif 70 71 #define DKF_READYFORDUMP (DKF_INITED|DKF_TAKEDUMP) 72 73 static int dk_subr_modcmd(modcmd_t, void *); 74 75 #define DKLABELDEV(dev) \ 76 (MAKEDISKDEV(major((dev)), DISKUNIT((dev)), RAW_PART)) 77 78 static void dk_makedisklabel(struct dk_softc *); 79 static int dk_translate(struct dk_softc *, struct buf *); 80 static void dk_done1(struct dk_softc *, struct buf *, bool); 81 82 void 83 dk_init(struct dk_softc *dksc, device_t dev, int dtype) 84 { 85 86 memset(dksc, 0x0, sizeof(*dksc)); 87 dksc->sc_dtype = dtype; 88 dksc->sc_dev = dev; 89 90 strlcpy(dksc->sc_xname, device_xname(dev), DK_XNAME_SIZE); 91 dksc->sc_dkdev.dk_name = dksc->sc_xname; 92 } 93 94 void 95 dk_attach(struct dk_softc *dksc) 96 { 97 KASSERT(dksc->sc_dev != NULL); 98 99 mutex_init(&dksc->sc_iolock, MUTEX_DEFAULT, IPL_VM); 100 dksc->sc_flags |= DKF_READYFORDUMP; 101 #ifdef DIAGNOSTIC 102 dksc->sc_flags |= DKF_WARNLABEL | DKF_LABELSANITY; 103 #endif 104 105 /* Attach the device into the rnd source list. */ 106 rnd_attach_source(&dksc->sc_rnd_source, dksc->sc_xname, 107 RND_TYPE_DISK, RND_FLAG_DEFAULT); 108 } 109 110 void 111 dk_detach(struct dk_softc *dksc) 112 { 113 /* Unhook the entropy source. */ 114 rnd_detach_source(&dksc->sc_rnd_source); 115 116 dksc->sc_flags &= ~DKF_READYFORDUMP; 117 mutex_destroy(&dksc->sc_iolock); 118 } 119 120 /* ARGSUSED */ 121 int 122 dk_open(struct dk_softc *dksc, dev_t dev, 123 int flags, int fmt, struct lwp *l) 124 { 125 const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver; 126 struct disklabel *lp = dksc->sc_dkdev.dk_label; 127 int part = DISKPART(dev); 128 int pmask = 1 << part; 129 int ret = 0; 130 struct disk *dk = &dksc->sc_dkdev; 131 132 DPRINTF_FOLLOW(("%s(%s, %p, 0x%"PRIx64", 0x%x)\n", __func__, 133 dksc->sc_xname, dksc, dev, flags)); 134 135 mutex_enter(&dk->dk_openlock); 136 137 /* 138 * If there are wedges, and this is not RAW_PART, then we 139 * need to fail. 140 */ 141 if (dk->dk_nwedges != 0 && part != RAW_PART) { 142 ret = EBUSY; 143 goto done; 144 } 145 146 /* 147 * initialize driver for the first opener 148 */ 149 if (dk->dk_openmask == 0 && dkd->d_firstopen != NULL) { 150 ret = (*dkd->d_firstopen)(dksc->sc_dev, dev, flags, fmt); 151 if (ret) 152 goto done; 153 } 154 155 /* 156 * If we're init'ed and there are no other open partitions then 157 * update the in-core disklabel. 158 */ 159 if ((dksc->sc_flags & DKF_INITED)) { 160 if ((dksc->sc_flags & DKF_VLABEL) == 0) { 161 dksc->sc_flags |= DKF_VLABEL; 162 dk_getdisklabel(dksc, dev); 163 } 164 } 165 166 /* Fail if we can't find the partition. */ 167 if (part != RAW_PART && 168 ((dksc->sc_flags & DKF_VLABEL) == 0 || 169 part >= lp->d_npartitions || 170 lp->d_partitions[part].p_fstype == FS_UNUSED)) { 171 ret = ENXIO; 172 goto done; 173 } 174 175 /* Mark our unit as open. */ 176 switch (fmt) { 177 case S_IFCHR: 178 dk->dk_copenmask |= pmask; 179 break; 180 case S_IFBLK: 181 dk->dk_bopenmask |= pmask; 182 break; 183 } 184 185 dk->dk_openmask = dk->dk_copenmask | dk->dk_bopenmask; 186 187 done: 188 mutex_exit(&dk->dk_openlock); 189 return ret; 190 } 191 192 /* ARGSUSED */ 193 int 194 dk_close(struct dk_softc *dksc, dev_t dev, 195 int flags, int fmt, struct lwp *l) 196 { 197 const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver; 198 int part = DISKPART(dev); 199 int pmask = 1 << part; 200 struct disk *dk = &dksc->sc_dkdev; 201 202 DPRINTF_FOLLOW(("%s(%s, %p, 0x%"PRIx64", 0x%x)\n", __func__, 203 dksc->sc_xname, dksc, dev, flags)); 204 205 mutex_enter(&dk->dk_openlock); 206 207 switch (fmt) { 208 case S_IFCHR: 209 dk->dk_copenmask &= ~pmask; 210 break; 211 case S_IFBLK: 212 dk->dk_bopenmask &= ~pmask; 213 break; 214 } 215 dk->dk_openmask = dk->dk_copenmask | dk->dk_bopenmask; 216 217 if (dk->dk_openmask == 0) { 218 if (dkd->d_lastclose != NULL) 219 (*dkd->d_lastclose)(dksc->sc_dev); 220 if ((dksc->sc_flags & DKF_KLABEL) == 0) 221 dksc->sc_flags &= ~DKF_VLABEL; 222 } 223 224 mutex_exit(&dk->dk_openlock); 225 return 0; 226 } 227 228 static int 229 dk_translate(struct dk_softc *dksc, struct buf *bp) 230 { 231 int part; 232 int wlabel; 233 daddr_t blkno; 234 struct disklabel *lp; 235 struct disk *dk; 236 uint64_t numsecs; 237 unsigned secsize; 238 239 lp = dksc->sc_dkdev.dk_label; 240 dk = &dksc->sc_dkdev; 241 242 part = DISKPART(bp->b_dev); 243 numsecs = dk->dk_geom.dg_secperunit; 244 secsize = dk->dk_geom.dg_secsize; 245 246 /* 247 * The transfer must be a whole number of blocks and the offset must 248 * not be negative. 249 */ 250 if ((bp->b_bcount % secsize) != 0 || bp->b_blkno < 0) { 251 bp->b_error = EINVAL; 252 goto done; 253 } 254 255 /* If there is nothing to do, then we are done */ 256 if (bp->b_bcount == 0) 257 goto done; 258 259 wlabel = dksc->sc_flags & (DKF_WLABEL|DKF_LABELLING); 260 if (part == RAW_PART) { 261 uint64_t numblocks = btodb(numsecs * secsize); 262 if (bounds_check_with_mediasize(bp, DEV_BSIZE, numblocks) <= 0) 263 goto done; 264 } else { 265 if (bounds_check_with_label(&dksc->sc_dkdev, bp, wlabel) <= 0) 266 goto done; 267 } 268 269 /* 270 * Convert the block number to absolute and put it in terms 271 * of the device's logical block size. 272 */ 273 if (secsize >= DEV_BSIZE) 274 blkno = bp->b_blkno / (secsize / DEV_BSIZE); 275 else 276 blkno = bp->b_blkno * (DEV_BSIZE / secsize); 277 278 if (part != RAW_PART) 279 blkno += lp->d_partitions[DISKPART(bp->b_dev)].p_offset; 280 bp->b_rawblkno = blkno; 281 282 return -1; 283 284 done: 285 bp->b_resid = bp->b_bcount; 286 return bp->b_error; 287 } 288 289 static int 290 dk_strategy1(struct dk_softc *dksc, struct buf *bp) 291 { 292 int error; 293 294 DPRINTF_FOLLOW(("%s(%s, %p, %p)\n", __func__, 295 dksc->sc_xname, dksc, bp)); 296 297 if (!(dksc->sc_flags & DKF_INITED)) { 298 DPRINTF_FOLLOW(("%s: not inited\n", __func__)); 299 bp->b_error = ENXIO; 300 bp->b_resid = bp->b_bcount; 301 biodone(bp); 302 return 1; 303 } 304 305 error = dk_translate(dksc, bp); 306 if (error >= 0) { 307 biodone(bp); 308 return 1; 309 } 310 311 return 0; 312 } 313 314 void 315 dk_strategy(struct dk_softc *dksc, struct buf *bp) 316 { 317 int error; 318 319 error = dk_strategy1(dksc, bp); 320 if (error) 321 return; 322 323 /* 324 * Queue buffer and start unit 325 */ 326 dk_start(dksc, bp); 327 } 328 329 int 330 dk_strategy_defer(struct dk_softc *dksc, struct buf *bp) 331 { 332 int error; 333 334 error = dk_strategy1(dksc, bp); 335 if (error) 336 return error; 337 338 /* 339 * Queue buffer only 340 */ 341 mutex_enter(&dksc->sc_iolock); 342 bufq_put(dksc->sc_bufq, bp); 343 mutex_exit(&dksc->sc_iolock); 344 345 return 0; 346 } 347 348 int 349 dk_strategy_pending(struct dk_softc *dksc) 350 { 351 struct buf *bp; 352 353 if (!(dksc->sc_flags & DKF_INITED)) { 354 DPRINTF_FOLLOW(("%s: not inited\n", __func__)); 355 return 0; 356 } 357 358 mutex_enter(&dksc->sc_iolock); 359 bp = bufq_peek(dksc->sc_bufq); 360 mutex_exit(&dksc->sc_iolock); 361 362 return bp != NULL; 363 } 364 365 void 366 dk_start(struct dk_softc *dksc, struct buf *bp) 367 { 368 const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver; 369 int error; 370 371 if (!(dksc->sc_flags & DKF_INITED)) { 372 DPRINTF_FOLLOW(("%s: not inited\n", __func__)); 373 return; 374 } 375 376 mutex_enter(&dksc->sc_iolock); 377 378 if (bp != NULL) 379 bufq_put(dksc->sc_bufq, bp); 380 381 if (dksc->sc_busy) 382 goto done; 383 dksc->sc_busy = true; 384 385 /* 386 * Peeking at the buffer queue and committing the operation 387 * only after success isn't atomic. 388 * 389 * So when a diskstart fails, the buffer is saved 390 * and tried again before the next buffer is fetched. 391 * dk_drain() handles flushing of a saved buffer. 392 * 393 * This keeps order of I/O operations, unlike bufq_put. 394 */ 395 396 bp = dksc->sc_deferred; 397 dksc->sc_deferred = NULL; 398 399 if (bp == NULL) 400 bp = bufq_get(dksc->sc_bufq); 401 402 while (bp != NULL) { 403 404 disk_busy(&dksc->sc_dkdev); 405 mutex_exit(&dksc->sc_iolock); 406 error = dkd->d_diskstart(dksc->sc_dev, bp); 407 mutex_enter(&dksc->sc_iolock); 408 if (error == EAGAIN) { 409 dksc->sc_deferred = bp; 410 disk_unbusy(&dksc->sc_dkdev, 0, (bp->b_flags & B_READ)); 411 break; 412 } 413 414 if (error != 0) { 415 bp->b_error = error; 416 bp->b_resid = bp->b_bcount; 417 dk_done1(dksc, bp, false); 418 } 419 420 bp = bufq_get(dksc->sc_bufq); 421 } 422 423 dksc->sc_busy = false; 424 done: 425 mutex_exit(&dksc->sc_iolock); 426 } 427 428 static void 429 dk_done1(struct dk_softc *dksc, struct buf *bp, bool lock) 430 { 431 struct disk *dk = &dksc->sc_dkdev; 432 433 if (bp->b_error != 0) { 434 struct cfdriver *cd = device_cfdriver(dksc->sc_dev); 435 436 diskerr(bp, cd->cd_name, "error", LOG_PRINTF, 0, 437 dk->dk_label); 438 printf("\n"); 439 } 440 441 if (lock) 442 mutex_enter(&dksc->sc_iolock); 443 disk_unbusy(dk, bp->b_bcount - bp->b_resid, (bp->b_flags & B_READ)); 444 if (lock) 445 mutex_exit(&dksc->sc_iolock); 446 447 rnd_add_uint32(&dksc->sc_rnd_source, bp->b_rawblkno); 448 449 biodone(bp); 450 } 451 452 void 453 dk_done(struct dk_softc *dksc, struct buf *bp) 454 { 455 dk_done1(dksc, bp, true); 456 } 457 458 void 459 dk_drain(struct dk_softc *dksc) 460 { 461 struct buf *bp; 462 463 mutex_enter(&dksc->sc_iolock); 464 bp = dksc->sc_deferred; 465 dksc->sc_deferred = NULL; 466 if (bp != NULL) { 467 bp->b_error = EIO; 468 bp->b_resid = bp->b_bcount; 469 biodone(bp); 470 } 471 bufq_drain(dksc->sc_bufq); 472 mutex_exit(&dksc->sc_iolock); 473 } 474 475 int 476 dk_discard(struct dk_softc *dksc, dev_t dev, off_t pos, off_t len) 477 { 478 const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver; 479 unsigned secsize = dksc->sc_dkdev.dk_geom.dg_secsize; 480 struct buf tmp, *bp = &tmp; 481 int error; 482 483 DPRINTF_FOLLOW(("%s(%s, %p, 0x"PRIx64", %jd, %jd)\n", __func__, 484 dksc->sc_xname, dksc, (intmax_t)pos, (intmax_t)len)); 485 486 if (!(dksc->sc_flags & DKF_INITED)) { 487 DPRINTF_FOLLOW(("%s: not inited\n", __func__)); 488 return ENXIO; 489 } 490 491 if (secsize == 0 || (pos % secsize) != 0) 492 return EINVAL; 493 494 /* enough data to please the bounds checking code */ 495 bp->b_dev = dev; 496 bp->b_blkno = (daddr_t)(pos / secsize); 497 bp->b_bcount = len; 498 bp->b_flags = B_WRITE; 499 500 error = dk_translate(dksc, bp); 501 if (error >= 0) 502 return error; 503 504 error = dkd->d_discard(dksc->sc_dev, 505 (off_t)bp->b_rawblkno * secsize, 506 (off_t)bp->b_bcount); 507 508 return error; 509 } 510 511 int 512 dk_size(struct dk_softc *dksc, dev_t dev) 513 { 514 const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver; 515 struct disklabel *lp; 516 int is_open; 517 int part; 518 int size; 519 520 if ((dksc->sc_flags & DKF_INITED) == 0) 521 return -1; 522 523 part = DISKPART(dev); 524 is_open = dksc->sc_dkdev.dk_openmask & (1 << part); 525 526 if (!is_open && dkd->d_open(dev, 0, S_IFBLK, curlwp)) 527 return -1; 528 529 lp = dksc->sc_dkdev.dk_label; 530 if (lp->d_partitions[part].p_fstype != FS_SWAP) 531 size = -1; 532 else 533 size = lp->d_partitions[part].p_size * 534 (lp->d_secsize / DEV_BSIZE); 535 536 if (!is_open && dkd->d_close(dev, 0, S_IFBLK, curlwp)) 537 return -1; 538 539 return size; 540 } 541 542 int 543 dk_ioctl(struct dk_softc *dksc, dev_t dev, 544 u_long cmd, void *data, int flag, struct lwp *l) 545 { 546 const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver; 547 struct disklabel *lp; 548 struct disk *dk = &dksc->sc_dkdev; 549 #ifdef __HAVE_OLD_DISKLABEL 550 struct disklabel newlabel; 551 #endif 552 int error; 553 554 DPRINTF_FOLLOW(("%s(%s, %p, 0x%"PRIx64", 0x%lx)\n", __func__, 555 dksc->sc_xname, dksc, dev, cmd)); 556 557 /* ensure that the pseudo disk is open for writes for these commands */ 558 switch (cmd) { 559 case DIOCSDINFO: 560 case DIOCWDINFO: 561 #ifdef __HAVE_OLD_DISKLABEL 562 case ODIOCSDINFO: 563 case ODIOCWDINFO: 564 #endif 565 case DIOCKLABEL: 566 case DIOCWLABEL: 567 case DIOCAWEDGE: 568 case DIOCDWEDGE: 569 case DIOCSSTRATEGY: 570 if ((flag & FWRITE) == 0) 571 return EBADF; 572 } 573 574 /* ensure that the pseudo-disk is initialized for these */ 575 switch (cmd) { 576 case DIOCGDINFO: 577 case DIOCSDINFO: 578 case DIOCWDINFO: 579 case DIOCGPARTINFO: 580 case DIOCKLABEL: 581 case DIOCWLABEL: 582 case DIOCGDEFLABEL: 583 case DIOCAWEDGE: 584 case DIOCDWEDGE: 585 case DIOCLWEDGES: 586 case DIOCMWEDGES: 587 case DIOCCACHESYNC: 588 #ifdef __HAVE_OLD_DISKLABEL 589 case ODIOCGDINFO: 590 case ODIOCSDINFO: 591 case ODIOCWDINFO: 592 case ODIOCGDEFLABEL: 593 #endif 594 if ((dksc->sc_flags & DKF_INITED) == 0) 595 return ENXIO; 596 } 597 598 error = disk_ioctl(dk, dev, cmd, data, flag, l); 599 if (error != EPASSTHROUGH) 600 return error; 601 else 602 error = 0; 603 604 switch (cmd) { 605 case DIOCWDINFO: 606 case DIOCSDINFO: 607 #ifdef __HAVE_OLD_DISKLABEL 608 case ODIOCWDINFO: 609 case ODIOCSDINFO: 610 #endif 611 #ifdef __HAVE_OLD_DISKLABEL 612 if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) { 613 memset(&newlabel, 0, sizeof newlabel); 614 memcpy(&newlabel, data, sizeof (struct olddisklabel)); 615 lp = &newlabel; 616 } else 617 #endif 618 lp = (struct disklabel *)data; 619 620 mutex_enter(&dk->dk_openlock); 621 dksc->sc_flags |= DKF_LABELLING; 622 623 error = setdisklabel(dksc->sc_dkdev.dk_label, 624 lp, 0, dksc->sc_dkdev.dk_cpulabel); 625 if (error == 0) { 626 if (cmd == DIOCWDINFO 627 #ifdef __HAVE_OLD_DISKLABEL 628 || cmd == ODIOCWDINFO 629 #endif 630 ) 631 error = writedisklabel(DKLABELDEV(dev), 632 dkd->d_strategy, dksc->sc_dkdev.dk_label, 633 dksc->sc_dkdev.dk_cpulabel); 634 } 635 636 dksc->sc_flags &= ~DKF_LABELLING; 637 mutex_exit(&dk->dk_openlock); 638 break; 639 640 case DIOCKLABEL: 641 if (*(int *)data != 0) 642 dksc->sc_flags |= DKF_KLABEL; 643 else 644 dksc->sc_flags &= ~DKF_KLABEL; 645 break; 646 647 case DIOCWLABEL: 648 if (*(int *)data != 0) 649 dksc->sc_flags |= DKF_WLABEL; 650 else 651 dksc->sc_flags &= ~DKF_WLABEL; 652 break; 653 654 case DIOCGDEFLABEL: 655 dk_getdefaultlabel(dksc, (struct disklabel *)data); 656 break; 657 658 #ifdef __HAVE_OLD_DISKLABEL 659 case ODIOCGDEFLABEL: 660 dk_getdefaultlabel(dksc, &newlabel); 661 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 662 return ENOTTY; 663 memcpy(data, &newlabel, sizeof (struct olddisklabel)); 664 break; 665 #endif 666 667 case DIOCGSTRATEGY: 668 { 669 struct disk_strategy *dks = (void *)data; 670 671 mutex_enter(&dksc->sc_iolock); 672 if (dksc->sc_bufq != NULL) 673 strlcpy(dks->dks_name, 674 bufq_getstrategyname(dksc->sc_bufq), 675 sizeof(dks->dks_name)); 676 else 677 error = EINVAL; 678 mutex_exit(&dksc->sc_iolock); 679 dks->dks_paramlen = 0; 680 break; 681 } 682 683 case DIOCSSTRATEGY: 684 { 685 struct disk_strategy *dks = (void *)data; 686 struct bufq_state *new; 687 struct bufq_state *old; 688 689 if (dks->dks_param != NULL) { 690 return EINVAL; 691 } 692 dks->dks_name[sizeof(dks->dks_name) - 1] = 0; /* ensure term */ 693 error = bufq_alloc(&new, dks->dks_name, 694 BUFQ_EXACT|BUFQ_SORT_RAWBLOCK); 695 if (error) { 696 return error; 697 } 698 mutex_enter(&dksc->sc_iolock); 699 old = dksc->sc_bufq; 700 if (old) 701 bufq_move(new, old); 702 dksc->sc_bufq = new; 703 mutex_exit(&dksc->sc_iolock); 704 if (old) 705 bufq_free(old); 706 break; 707 } 708 709 default: 710 error = ENOTTY; 711 } 712 713 return error; 714 } 715 716 /* 717 * dk_dump dumps all of physical memory into the partition specified. 718 * This requires substantially more framework than {s,w}ddump, and hence 719 * is probably much more fragile. 720 * 721 */ 722 723 #define DKFF_READYFORDUMP(x) (((x) & DKF_READYFORDUMP) == DKF_READYFORDUMP) 724 static volatile int dk_dumping = 0; 725 726 /* ARGSUSED */ 727 int 728 dk_dump(struct dk_softc *dksc, dev_t dev, 729 daddr_t blkno, void *vav, size_t size) 730 { 731 const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver; 732 char *va = vav; 733 struct disklabel *lp; 734 struct partition *p; 735 int part, towrt, nsects, sectoff, maxblkcnt, nblk; 736 int maxxfer, rv = 0; 737 738 /* 739 * ensure that we consider this device to be safe for dumping, 740 * and that the device is configured. 741 */ 742 if (!DKFF_READYFORDUMP(dksc->sc_flags)) { 743 DPRINTF(DKDB_DUMP, ("%s: bad dump flags 0x%x\n", __func__, 744 dksc->sc_flags)); 745 return ENXIO; 746 } 747 748 /* ensure that we are not already dumping */ 749 if (dk_dumping) 750 return EFAULT; 751 dk_dumping = 1; 752 753 if (dkd->d_dumpblocks == NULL) { 754 DPRINTF(DKDB_DUMP, ("%s: no dumpblocks\n", __func__)); 755 return ENXIO; 756 } 757 758 /* device specific max transfer size */ 759 maxxfer = MAXPHYS; 760 if (dkd->d_iosize != NULL) 761 (*dkd->d_iosize)(dksc->sc_dev, &maxxfer); 762 763 /* Convert to disk sectors. Request must be a multiple of size. */ 764 part = DISKPART(dev); 765 lp = dksc->sc_dkdev.dk_label; 766 if ((size % lp->d_secsize) != 0) { 767 DPRINTF(DKDB_DUMP, ("%s: odd size %zu\n", __func__, size)); 768 return EFAULT; 769 } 770 towrt = size / lp->d_secsize; 771 blkno = dbtob(blkno) / lp->d_secsize; /* blkno in secsize units */ 772 773 p = &lp->d_partitions[part]; 774 if (p->p_fstype != FS_SWAP) { 775 DPRINTF(DKDB_DUMP, ("%s: bad fstype %d\n", __func__, 776 p->p_fstype)); 777 return ENXIO; 778 } 779 nsects = p->p_size; 780 sectoff = p->p_offset; 781 782 /* Check transfer bounds against partition size. */ 783 if ((blkno < 0) || ((blkno + towrt) > nsects)) { 784 DPRINTF(DKDB_DUMP, ("%s: out of bounds blkno=%jd, towrt=%d, " 785 "nsects=%d\n", __func__, (intmax_t)blkno, towrt, nsects)); 786 return EINVAL; 787 } 788 789 /* Offset block number to start of partition. */ 790 blkno += sectoff; 791 792 /* Start dumping and return when done. */ 793 maxblkcnt = howmany(maxxfer, lp->d_secsize); 794 while (towrt > 0) { 795 nblk = min(maxblkcnt, towrt); 796 797 if ((rv = (*dkd->d_dumpblocks)(dksc->sc_dev, va, blkno, nblk)) 798 != 0) { 799 DPRINTF(DKDB_DUMP, ("%s: dumpblocks %d\n", __func__, 800 rv)); 801 return rv; 802 } 803 804 towrt -= nblk; 805 blkno += nblk; 806 va += nblk * lp->d_secsize; 807 } 808 809 dk_dumping = 0; 810 811 return 0; 812 } 813 814 /* ARGSUSED */ 815 void 816 dk_getdefaultlabel(struct dk_softc *dksc, struct disklabel *lp) 817 { 818 const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver; 819 struct disk_geom *dg = &dksc->sc_dkdev.dk_geom; 820 821 memset(lp, 0, sizeof(*lp)); 822 823 if (dg->dg_secperunit > UINT32_MAX) 824 lp->d_secperunit = UINT32_MAX; 825 else 826 lp->d_secperunit = dg->dg_secperunit; 827 lp->d_secsize = dg->dg_secsize; 828 lp->d_nsectors = dg->dg_nsectors; 829 lp->d_ntracks = dg->dg_ntracks; 830 lp->d_ncylinders = dg->dg_ncylinders; 831 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 832 833 strlcpy(lp->d_typename, dksc->sc_xname, sizeof(lp->d_typename)); 834 lp->d_type = dksc->sc_dtype; 835 strlcpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); 836 lp->d_rpm = 3600; 837 lp->d_interleave = 1; 838 lp->d_flags = 0; 839 840 lp->d_partitions[RAW_PART].p_offset = 0; 841 lp->d_partitions[RAW_PART].p_size = lp->d_secperunit; 842 lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED; 843 lp->d_npartitions = RAW_PART + 1; 844 845 lp->d_magic = DISKMAGIC; 846 lp->d_magic2 = DISKMAGIC; 847 848 if (dkd->d_label) 849 dkd->d_label(dksc->sc_dev, lp); 850 851 lp->d_checksum = dkcksum(lp); 852 } 853 854 /* ARGSUSED */ 855 void 856 dk_getdisklabel(struct dk_softc *dksc, dev_t dev) 857 { 858 const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver; 859 struct disklabel *lp = dksc->sc_dkdev.dk_label; 860 struct cpu_disklabel *clp = dksc->sc_dkdev.dk_cpulabel; 861 struct disk_geom *dg = &dksc->sc_dkdev.dk_geom; 862 struct partition *pp; 863 int i; 864 const char *errstring; 865 866 memset(clp, 0x0, sizeof(*clp)); 867 dk_getdefaultlabel(dksc, lp); 868 errstring = readdisklabel(DKLABELDEV(dev), dkd->d_strategy, 869 dksc->sc_dkdev.dk_label, dksc->sc_dkdev.dk_cpulabel); 870 if (errstring) { 871 dk_makedisklabel(dksc); 872 if (dksc->sc_flags & DKF_WARNLABEL) 873 printf("%s: %s\n", dksc->sc_xname, errstring); 874 return; 875 } 876 877 if ((dksc->sc_flags & DKF_LABELSANITY) == 0) 878 return; 879 880 /* Sanity check */ 881 if (lp->d_secperunit < UINT32_MAX ? 882 lp->d_secperunit != dg->dg_secperunit : 883 lp->d_secperunit > dg->dg_secperunit) 884 printf("WARNING: %s: total sector size in disklabel (%ju) " 885 "!= the size of %s (%ju)\n", dksc->sc_xname, 886 (uintmax_t)lp->d_secperunit, dksc->sc_xname, 887 (uintmax_t)dg->dg_secperunit); 888 889 for (i=0; i < lp->d_npartitions; i++) { 890 pp = &lp->d_partitions[i]; 891 if (pp->p_offset + pp->p_size > dg->dg_secperunit) 892 printf("WARNING: %s: end of partition `%c' exceeds " 893 "the size of %s (%ju)\n", dksc->sc_xname, 894 'a' + i, dksc->sc_xname, 895 (uintmax_t)dg->dg_secperunit); 896 } 897 } 898 899 /* ARGSUSED */ 900 static void 901 dk_makedisklabel(struct dk_softc *dksc) 902 { 903 struct disklabel *lp = dksc->sc_dkdev.dk_label; 904 905 lp->d_partitions[RAW_PART].p_fstype = FS_BSDFFS; 906 strlcpy(lp->d_packname, "default label", sizeof(lp->d_packname)); 907 lp->d_checksum = dkcksum(lp); 908 } 909 910 /* This function is taken from ccd.c:1.76 --rcd */ 911 912 /* 913 * XXX this function looks too generic for dksubr.c, shouldn't we 914 * put it somewhere better? 915 */ 916 917 /* 918 * Lookup the provided name in the filesystem. If the file exists, 919 * is a valid block device, and isn't being used by anyone else, 920 * set *vpp to the file's vnode. 921 */ 922 int 923 dk_lookup(struct pathbuf *pb, struct lwp *l, struct vnode **vpp) 924 { 925 struct nameidata nd; 926 struct vnode *vp; 927 int error; 928 929 if (l == NULL) 930 return ESRCH; /* Is ESRCH the best choice? */ 931 932 NDINIT(&nd, LOOKUP, FOLLOW, pb); 933 if ((error = vn_open(&nd, FREAD | FWRITE, 0)) != 0) { 934 DPRINTF((DKDB_FOLLOW|DKDB_INIT), 935 ("%s: vn_open error = %d\n", __func__, error)); 936 return error; 937 } 938 939 vp = nd.ni_vp; 940 if (vp->v_type != VBLK) { 941 error = ENOTBLK; 942 goto out; 943 } 944 945 /* Reopen as anonymous vnode to protect against forced unmount. */ 946 if ((error = bdevvp(vp->v_rdev, vpp)) != 0) 947 goto out; 948 VOP_UNLOCK(vp); 949 if ((error = vn_close(vp, FREAD | FWRITE, l->l_cred)) != 0) { 950 vrele(*vpp); 951 return error; 952 } 953 if ((error = VOP_OPEN(*vpp, FREAD | FWRITE, l->l_cred)) != 0) { 954 vrele(*vpp); 955 return error; 956 } 957 mutex_enter((*vpp)->v_interlock); 958 (*vpp)->v_writecount++; 959 mutex_exit((*vpp)->v_interlock); 960 961 IFDEBUG(DKDB_VNODE, vprint("dk_lookup: vnode info", *vpp)); 962 963 return 0; 964 out: 965 VOP_UNLOCK(vp); 966 (void) vn_close(vp, FREAD | FWRITE, l->l_cred); 967 return error; 968 } 969 970 MODULE(MODULE_CLASS_MISC, dk_subr, NULL); 971 972 static int 973 dk_subr_modcmd(modcmd_t cmd, void *arg) 974 { 975 switch (cmd) { 976 case MODULE_CMD_INIT: 977 case MODULE_CMD_FINI: 978 return 0; 979 case MODULE_CMD_STAT: 980 case MODULE_CMD_AUTOUNLOAD: 981 default: 982 return ENOTTY; 983 } 984 } 985
Indexes created Sat Oct 18 08:10:09 GMT 2025