dksubr.c revision 1.54.2.5
1 /* $NetBSD: dksubr.c,v 1.54.2.5 2016/03/19 11:30:08 skrll 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 1.54.2.5 2016/03/19 11:30:08 skrll 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 struct disklabel *lp = dksc->sc_dkdev.dk_label; 126 int part = DISKPART(dev); 127 int pmask = 1 << part; 128 int ret = 0; 129 struct disk *dk = &dksc->sc_dkdev; 130 131 DPRINTF_FOLLOW(("%s(%s, %p, 0x%"PRIx64", 0x%x)\n", __func__, 132 dksc->sc_xname, dksc, dev, flags)); 133 134 mutex_enter(&dk->dk_openlock); 135 136 /* 137 * If there are wedges, and this is not RAW_PART, then we 138 * need to fail. 139 */ 140 if (dk->dk_nwedges != 0 && part != RAW_PART) { 141 ret = EBUSY; 142 goto done; 143 } 144 145 /* 146 * If we're init'ed and there are no other open partitions then 147 * update the in-core disklabel. 148 */ 149 if ((dksc->sc_flags & DKF_INITED)) { 150 if ((dksc->sc_flags & DKF_VLABEL) == 0) { 151 dksc->sc_flags |= DKF_VLABEL; 152 dk_getdisklabel(dksc, dev); 153 } 154 } 155 156 /* Fail if we can't find the partition. */ 157 if (part != RAW_PART && 158 ((dksc->sc_flags & DKF_VLABEL) == 0 || 159 part >= lp->d_npartitions || 160 lp->d_partitions[part].p_fstype == FS_UNUSED)) { 161 ret = ENXIO; 162 goto done; 163 } 164 165 /* Mark our unit as open. */ 166 switch (fmt) { 167 case S_IFCHR: 168 dk->dk_copenmask |= pmask; 169 break; 170 case S_IFBLK: 171 dk->dk_bopenmask |= pmask; 172 break; 173 } 174 175 dk->dk_openmask = dk->dk_copenmask | dk->dk_bopenmask; 176 177 done: 178 mutex_exit(&dk->dk_openlock); 179 return ret; 180 } 181 182 /* ARGSUSED */ 183 int 184 dk_close(struct dk_softc *dksc, dev_t dev, 185 int flags, int fmt, struct lwp *l) 186 { 187 const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver; 188 int part = DISKPART(dev); 189 int pmask = 1 << part; 190 struct disk *dk = &dksc->sc_dkdev; 191 192 DPRINTF_FOLLOW(("%s(%s, %p, 0x%"PRIx64", 0x%x)\n", __func__, 193 dksc->sc_xname, dksc, dev, flags)); 194 195 mutex_enter(&dk->dk_openlock); 196 197 switch (fmt) { 198 case S_IFCHR: 199 dk->dk_copenmask &= ~pmask; 200 break; 201 case S_IFBLK: 202 dk->dk_bopenmask &= ~pmask; 203 break; 204 } 205 dk->dk_openmask = dk->dk_copenmask | dk->dk_bopenmask; 206 207 if (dk->dk_openmask == 0) { 208 if (dkd->d_lastclose != NULL) 209 (*dkd->d_lastclose)(dksc->sc_dev); 210 if ((dksc->sc_flags & DKF_KLABEL) == 0) 211 dksc->sc_flags &= ~DKF_VLABEL; 212 } 213 214 mutex_exit(&dk->dk_openlock); 215 return 0; 216 } 217 218 static int 219 dk_translate(struct dk_softc *dksc, struct buf *bp) 220 { 221 int part; 222 int wlabel; 223 daddr_t blkno; 224 struct disklabel *lp; 225 struct disk *dk; 226 uint64_t numsecs; 227 unsigned secsize; 228 229 lp = dksc->sc_dkdev.dk_label; 230 dk = &dksc->sc_dkdev; 231 232 part = DISKPART(bp->b_dev); 233 numsecs = dk->dk_geom.dg_secperunit; 234 secsize = dk->dk_geom.dg_secsize; 235 236 /* 237 * The transfer must be a whole number of blocks and the offset must 238 * not be negative. 239 */ 240 if ((bp->b_bcount % secsize) != 0 || bp->b_blkno < 0) { 241 bp->b_error = EINVAL; 242 goto done; 243 } 244 245 /* If there is nothing to do, then we are done */ 246 if (bp->b_bcount == 0) 247 goto done; 248 249 wlabel = dksc->sc_flags & (DKF_WLABEL|DKF_LABELLING); 250 if (part == RAW_PART) { 251 uint64_t numblocks = btodb(numsecs * secsize); 252 if (bounds_check_with_mediasize(bp, DEV_BSIZE, numblocks) <= 0) 253 goto done; 254 } else { 255 if (bounds_check_with_label(&dksc->sc_dkdev, bp, wlabel) <= 0) 256 goto done; 257 } 258 259 /* 260 * Convert the block number to absolute and put it in terms 261 * of the device's logical block size. 262 */ 263 if (secsize >= DEV_BSIZE) 264 blkno = bp->b_blkno / (secsize / DEV_BSIZE); 265 else 266 blkno = bp->b_blkno * (DEV_BSIZE / secsize); 267 268 if (part != RAW_PART) 269 blkno += lp->d_partitions[DISKPART(bp->b_dev)].p_offset; 270 bp->b_rawblkno = blkno; 271 272 return -1; 273 274 done: 275 bp->b_resid = bp->b_bcount; 276 return bp->b_error; 277 } 278 279 static int 280 dk_strategy1(struct dk_softc *dksc, struct buf *bp) 281 { 282 int error; 283 284 DPRINTF_FOLLOW(("%s(%s, %p, %p)\n", __func__, 285 dksc->sc_xname, dksc, bp)); 286 287 if (!(dksc->sc_flags & DKF_INITED)) { 288 DPRINTF_FOLLOW(("%s: not inited\n", __func__)); 289 bp->b_error = ENXIO; 290 biodone(bp); 291 return 1; 292 } 293 294 error = dk_translate(dksc, bp); 295 if (error >= 0) { 296 biodone(bp); 297 return 1; 298 } 299 300 return 0; 301 } 302 303 void 304 dk_strategy(struct dk_softc *dksc, struct buf *bp) 305 { 306 int error; 307 308 error = dk_strategy1(dksc, bp); 309 if (error) 310 return; 311 312 /* 313 * Queue buffer and start unit 314 */ 315 dk_start(dksc, bp); 316 } 317 318 int 319 dk_strategy_defer(struct dk_softc *dksc, struct buf *bp) 320 { 321 int error; 322 323 error = dk_strategy1(dksc, bp); 324 if (error) 325 return error; 326 327 /* 328 * Queue buffer only 329 */ 330 mutex_enter(&dksc->sc_iolock); 331 bufq_put(dksc->sc_bufq, bp); 332 mutex_exit(&dksc->sc_iolock); 333 334 return 0; 335 } 336 337 int 338 dk_strategy_pending(struct dk_softc *dksc) 339 { 340 struct buf *bp; 341 342 if (!(dksc->sc_flags & DKF_INITED)) { 343 DPRINTF_FOLLOW(("%s: not inited\n", __func__)); 344 return 0; 345 } 346 347 mutex_enter(&dksc->sc_iolock); 348 bp = bufq_peek(dksc->sc_bufq); 349 mutex_exit(&dksc->sc_iolock); 350 351 return bp != NULL; 352 } 353 354 void 355 dk_start(struct dk_softc *dksc, struct buf *bp) 356 { 357 const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver; 358 int error; 359 360 if (!(dksc->sc_flags & DKF_INITED)) { 361 DPRINTF_FOLLOW(("%s: not inited\n", __func__)); 362 return; 363 } 364 365 mutex_enter(&dksc->sc_iolock); 366 367 if (bp != NULL) 368 bufq_put(dksc->sc_bufq, bp); 369 370 if (dksc->sc_busy) 371 goto done; 372 dksc->sc_busy = true; 373 374 /* 375 * Peeking at the buffer queue and committing the operation 376 * only after success isn't atomic. 377 * 378 * So when a diskstart fails, the buffer is saved 379 * and tried again before the next buffer is fetched. 380 * dk_drain() handles flushing of a saved buffer. 381 * 382 * This keeps order of I/O operations, unlike bufq_put. 383 */ 384 385 bp = dksc->sc_deferred; 386 dksc->sc_deferred = NULL; 387 388 if (bp == NULL) 389 bp = bufq_get(dksc->sc_bufq); 390 391 while (bp != NULL) { 392 393 disk_busy(&dksc->sc_dkdev); 394 mutex_exit(&dksc->sc_iolock); 395 error = dkd->d_diskstart(dksc->sc_dev, bp); 396 mutex_enter(&dksc->sc_iolock); 397 if (error == EAGAIN) { 398 dksc->sc_deferred = bp; 399 disk_unbusy(&dksc->sc_dkdev, 0, (bp->b_flags & B_READ)); 400 break; 401 } 402 403 if (error != 0) { 404 bp->b_error = error; 405 bp->b_resid = bp->b_bcount; 406 dk_done1(dksc, bp, false); 407 } 408 409 bp = bufq_get(dksc->sc_bufq); 410 } 411 412 dksc->sc_busy = false; 413 done: 414 mutex_exit(&dksc->sc_iolock); 415 } 416 417 static void 418 dk_done1(struct dk_softc *dksc, struct buf *bp, bool lock) 419 { 420 struct disk *dk = &dksc->sc_dkdev; 421 422 if (bp->b_error != 0) { 423 struct cfdriver *cd = device_cfdriver(dksc->sc_dev); 424 425 diskerr(bp, cd->cd_name, "error", LOG_PRINTF, 0, 426 dk->dk_label); 427 printf("\n"); 428 } 429 430 if (lock) 431 mutex_enter(&dksc->sc_iolock); 432 disk_unbusy(dk, bp->b_bcount - bp->b_resid, (bp->b_flags & B_READ)); 433 if (lock) 434 mutex_exit(&dksc->sc_iolock); 435 436 rnd_add_uint32(&dksc->sc_rnd_source, bp->b_rawblkno); 437 438 biodone(bp); 439 } 440 441 void 442 dk_done(struct dk_softc *dksc, struct buf *bp) 443 { 444 dk_done1(dksc, bp, true); 445 } 446 447 void 448 dk_drain(struct dk_softc *dksc) 449 { 450 struct buf *bp; 451 452 mutex_enter(&dksc->sc_iolock); 453 bp = dksc->sc_deferred; 454 dksc->sc_deferred = NULL; 455 if (bp != NULL) { 456 bp->b_error = EIO; 457 bp->b_resid = bp->b_bcount; 458 biodone(bp); 459 } 460 bufq_drain(dksc->sc_bufq); 461 mutex_exit(&dksc->sc_iolock); 462 } 463 464 int 465 dk_discard(struct dk_softc *dksc, dev_t dev, off_t pos, off_t len) 466 { 467 const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver; 468 unsigned secsize = dksc->sc_dkdev.dk_geom.dg_secsize; 469 struct buf tmp, *bp = &tmp; 470 int error; 471 472 DPRINTF_FOLLOW(("%s(%s, %p, 0x"PRIx64", %jd, %jd)\n", __func__, 473 dksc->sc_xname, dksc, (intmax_t)pos, (intmax_t)len)); 474 475 if (!(dksc->sc_flags & DKF_INITED)) { 476 DPRINTF_FOLLOW(("%s: not inited\n", __func__)); 477 return ENXIO; 478 } 479 480 if (secsize == 0 || (pos % secsize) != 0) 481 return EINVAL; 482 483 /* enough data to please the bounds checking code */ 484 bp->b_dev = dev; 485 bp->b_blkno = (daddr_t)(pos / secsize); 486 bp->b_bcount = len; 487 bp->b_flags = B_WRITE; 488 489 error = dk_translate(dksc, bp); 490 if (error >= 0) 491 return error; 492 493 error = dkd->d_discard(dksc->sc_dev, 494 (off_t)bp->b_rawblkno * secsize, 495 (off_t)bp->b_bcount); 496 497 return error; 498 } 499 500 int 501 dk_size(struct dk_softc *dksc, dev_t dev) 502 { 503 const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver; 504 struct disklabel *lp; 505 int is_open; 506 int part; 507 int size; 508 509 if ((dksc->sc_flags & DKF_INITED) == 0) 510 return -1; 511 512 part = DISKPART(dev); 513 is_open = dksc->sc_dkdev.dk_openmask & (1 << part); 514 515 if (!is_open && dkd->d_open(dev, 0, S_IFBLK, curlwp)) 516 return -1; 517 518 lp = dksc->sc_dkdev.dk_label; 519 if (lp->d_partitions[part].p_fstype != FS_SWAP) 520 size = -1; 521 else 522 size = lp->d_partitions[part].p_size * 523 (lp->d_secsize / DEV_BSIZE); 524 525 if (!is_open && dkd->d_close(dev, 0, S_IFBLK, curlwp)) 526 return -1; 527 528 return size; 529 } 530 531 int 532 dk_ioctl(struct dk_softc *dksc, dev_t dev, 533 u_long cmd, void *data, int flag, struct lwp *l) 534 { 535 const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver; 536 struct disklabel *lp; 537 struct disk *dk = &dksc->sc_dkdev; 538 #ifdef __HAVE_OLD_DISKLABEL 539 struct disklabel newlabel; 540 #endif 541 int error; 542 543 DPRINTF_FOLLOW(("%s(%s, %p, 0x%"PRIx64", 0x%lx)\n", __func__, 544 dksc->sc_xname, dksc, dev, cmd)); 545 546 /* ensure that the pseudo disk is open for writes for these commands */ 547 switch (cmd) { 548 case DIOCSDINFO: 549 case DIOCWDINFO: 550 #ifdef __HAVE_OLD_DISKLABEL 551 case ODIOCSDINFO: 552 case ODIOCWDINFO: 553 #endif 554 case DIOCKLABEL: 555 case DIOCWLABEL: 556 case DIOCAWEDGE: 557 case DIOCDWEDGE: 558 case DIOCSSTRATEGY: 559 if ((flag & FWRITE) == 0) 560 return EBADF; 561 } 562 563 /* ensure that the pseudo-disk is initialized for these */ 564 switch (cmd) { 565 case DIOCGDINFO: 566 case DIOCSDINFO: 567 case DIOCWDINFO: 568 case DIOCGPARTINFO: 569 case DIOCKLABEL: 570 case DIOCWLABEL: 571 case DIOCGDEFLABEL: 572 case DIOCAWEDGE: 573 case DIOCDWEDGE: 574 case DIOCLWEDGES: 575 case DIOCMWEDGES: 576 case DIOCCACHESYNC: 577 #ifdef __HAVE_OLD_DISKLABEL 578 case ODIOCGDINFO: 579 case ODIOCSDINFO: 580 case ODIOCWDINFO: 581 case ODIOCGDEFLABEL: 582 #endif 583 if ((dksc->sc_flags & DKF_INITED) == 0) 584 return ENXIO; 585 } 586 587 error = disk_ioctl(dk, dev, cmd, data, flag, l); 588 if (error != EPASSTHROUGH) 589 return error; 590 else 591 error = 0; 592 593 switch (cmd) { 594 case DIOCWDINFO: 595 case DIOCSDINFO: 596 #ifdef __HAVE_OLD_DISKLABEL 597 case ODIOCWDINFO: 598 case ODIOCSDINFO: 599 #endif 600 #ifdef __HAVE_OLD_DISKLABEL 601 if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) { 602 memset(&newlabel, 0, sizeof newlabel); 603 memcpy(&newlabel, data, sizeof (struct olddisklabel)); 604 lp = &newlabel; 605 } else 606 #endif 607 lp = (struct disklabel *)data; 608 609 mutex_enter(&dk->dk_openlock); 610 dksc->sc_flags |= DKF_LABELLING; 611 612 error = setdisklabel(dksc->sc_dkdev.dk_label, 613 lp, 0, dksc->sc_dkdev.dk_cpulabel); 614 if (error == 0) { 615 if (cmd == DIOCWDINFO 616 #ifdef __HAVE_OLD_DISKLABEL 617 || cmd == ODIOCWDINFO 618 #endif 619 ) 620 error = writedisklabel(DKLABELDEV(dev), 621 dkd->d_strategy, dksc->sc_dkdev.dk_label, 622 dksc->sc_dkdev.dk_cpulabel); 623 } 624 625 dksc->sc_flags &= ~DKF_LABELLING; 626 mutex_exit(&dk->dk_openlock); 627 break; 628 629 case DIOCKLABEL: 630 if (*(int *)data != 0) 631 dksc->sc_flags |= DKF_KLABEL; 632 else 633 dksc->sc_flags &= ~DKF_KLABEL; 634 break; 635 636 case DIOCWLABEL: 637 if (*(int *)data != 0) 638 dksc->sc_flags |= DKF_WLABEL; 639 else 640 dksc->sc_flags &= ~DKF_WLABEL; 641 break; 642 643 case DIOCGDEFLABEL: 644 dk_getdefaultlabel(dksc, (struct disklabel *)data); 645 break; 646 647 #ifdef __HAVE_OLD_DISKLABEL 648 case ODIOCGDEFLABEL: 649 dk_getdefaultlabel(dksc, &newlabel); 650 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 651 return ENOTTY; 652 memcpy(data, &newlabel, sizeof (struct olddisklabel)); 653 break; 654 #endif 655 656 case DIOCGSTRATEGY: 657 { 658 struct disk_strategy *dks = (void *)data; 659 660 mutex_enter(&dksc->sc_iolock); 661 strlcpy(dks->dks_name, bufq_getstrategyname(dksc->sc_bufq), 662 sizeof(dks->dks_name)); 663 mutex_exit(&dksc->sc_iolock); 664 dks->dks_paramlen = 0; 665 666 return 0; 667 } 668 669 case DIOCSSTRATEGY: 670 { 671 struct disk_strategy *dks = (void *)data; 672 struct bufq_state *new; 673 struct bufq_state *old; 674 675 if (dks->dks_param != NULL) { 676 return EINVAL; 677 } 678 dks->dks_name[sizeof(dks->dks_name) - 1] = 0; /* ensure term */ 679 error = bufq_alloc(&new, dks->dks_name, 680 BUFQ_EXACT|BUFQ_SORT_RAWBLOCK); 681 if (error) { 682 return error; 683 } 684 mutex_enter(&dksc->sc_iolock); 685 old = dksc->sc_bufq; 686 bufq_move(new, old); 687 dksc->sc_bufq = new; 688 mutex_exit(&dksc->sc_iolock); 689 bufq_free(old); 690 691 return 0; 692 } 693 694 default: 695 error = ENOTTY; 696 } 697 698 return error; 699 } 700 701 /* 702 * dk_dump dumps all of physical memory into the partition specified. 703 * This requires substantially more framework than {s,w}ddump, and hence 704 * is probably much more fragile. 705 * 706 */ 707 708 #define DKFF_READYFORDUMP(x) (((x) & DKF_READYFORDUMP) == DKF_READYFORDUMP) 709 static volatile int dk_dumping = 0; 710 711 /* ARGSUSED */ 712 int 713 dk_dump(struct dk_softc *dksc, dev_t dev, 714 daddr_t blkno, void *vav, size_t size) 715 { 716 const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver; 717 char *va = vav; 718 struct disklabel *lp; 719 struct partition *p; 720 int part, towrt, nsects, sectoff, maxblkcnt, nblk; 721 int maxxfer, rv = 0; 722 723 /* 724 * ensure that we consider this device to be safe for dumping, 725 * and that the device is configured. 726 */ 727 if (!DKFF_READYFORDUMP(dksc->sc_flags)) { 728 DPRINTF(DKDB_DUMP, ("%s: bad dump flags 0x%x\n", __func__, 729 dksc->sc_flags)); 730 return ENXIO; 731 } 732 733 /* ensure that we are not already dumping */ 734 if (dk_dumping) 735 return EFAULT; 736 dk_dumping = 1; 737 738 if (dkd->d_dumpblocks == NULL) { 739 DPRINTF(DKDB_DUMP, ("%s: no dumpblocks\n", __func__)); 740 return ENXIO; 741 } 742 743 /* device specific max transfer size */ 744 maxxfer = MAXPHYS; 745 if (dkd->d_iosize != NULL) 746 (*dkd->d_iosize)(dksc->sc_dev, &maxxfer); 747 748 /* Convert to disk sectors. Request must be a multiple of size. */ 749 part = DISKPART(dev); 750 lp = dksc->sc_dkdev.dk_label; 751 if ((size % lp->d_secsize) != 0) { 752 DPRINTF(DKDB_DUMP, ("%s: odd size %zu\n", __func__, size)); 753 return EFAULT; 754 } 755 towrt = size / lp->d_secsize; 756 blkno = dbtob(blkno) / lp->d_secsize; /* blkno in secsize units */ 757 758 p = &lp->d_partitions[part]; 759 if (p->p_fstype != FS_SWAP) { 760 DPRINTF(DKDB_DUMP, ("%s: bad fstype %d\n", __func__, 761 p->p_fstype)); 762 return ENXIO; 763 } 764 nsects = p->p_size; 765 sectoff = p->p_offset; 766 767 /* Check transfer bounds against partition size. */ 768 if ((blkno < 0) || ((blkno + towrt) > nsects)) { 769 DPRINTF(DKDB_DUMP, ("%s: out of bounds blkno=%jd, towrt=%d, " 770 "nsects=%d\n", __func__, (intmax_t)blkno, towrt, nsects)); 771 return EINVAL; 772 } 773 774 /* Offset block number to start of partition. */ 775 blkno += sectoff; 776 777 /* Start dumping and return when done. */ 778 maxblkcnt = howmany(maxxfer, lp->d_secsize); 779 while (towrt > 0) { 780 nblk = min(maxblkcnt, towrt); 781 782 if ((rv = (*dkd->d_dumpblocks)(dksc->sc_dev, va, blkno, nblk)) 783 != 0) { 784 DPRINTF(DKDB_DUMP, ("%s: dumpblocks %d\n", __func__, 785 rv)); 786 return rv; 787 } 788 789 towrt -= nblk; 790 blkno += nblk; 791 va += nblk * lp->d_secsize; 792 } 793 794 dk_dumping = 0; 795 796 return 0; 797 } 798 799 /* ARGSUSED */ 800 void 801 dk_getdefaultlabel(struct dk_softc *dksc, struct disklabel *lp) 802 { 803 struct disk_geom *dg = &dksc->sc_dkdev.dk_geom; 804 805 memset(lp, 0, sizeof(*lp)); 806 807 if (dg->dg_secperunit > UINT32_MAX) 808 lp->d_secperunit = UINT32_MAX; 809 else 810 lp->d_secperunit = dg->dg_secperunit; 811 lp->d_secsize = dg->dg_secsize; 812 lp->d_nsectors = dg->dg_nsectors; 813 lp->d_ntracks = dg->dg_ntracks; 814 lp->d_ncylinders = dg->dg_ncylinders; 815 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 816 817 strlcpy(lp->d_typename, dksc->sc_xname, sizeof(lp->d_typename)); 818 lp->d_type = dksc->sc_dtype; 819 strlcpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); 820 lp->d_rpm = 3600; 821 lp->d_interleave = 1; 822 lp->d_flags = 0; 823 824 lp->d_partitions[RAW_PART].p_offset = 0; 825 lp->d_partitions[RAW_PART].p_size = lp->d_secperunit; 826 lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED; 827 lp->d_npartitions = RAW_PART + 1; 828 829 lp->d_magic = DISKMAGIC; 830 lp->d_magic2 = DISKMAGIC; 831 lp->d_checksum = dkcksum(dksc->sc_dkdev.dk_label); 832 } 833 834 /* ARGSUSED */ 835 void 836 dk_getdisklabel(struct dk_softc *dksc, dev_t dev) 837 { 838 const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver; 839 struct disklabel *lp = dksc->sc_dkdev.dk_label; 840 struct cpu_disklabel *clp = dksc->sc_dkdev.dk_cpulabel; 841 struct disk_geom *dg = &dksc->sc_dkdev.dk_geom; 842 struct partition *pp; 843 int i; 844 const char *errstring; 845 846 memset(clp, 0x0, sizeof(*clp)); 847 dk_getdefaultlabel(dksc, lp); 848 errstring = readdisklabel(DKLABELDEV(dev), dkd->d_strategy, 849 dksc->sc_dkdev.dk_label, dksc->sc_dkdev.dk_cpulabel); 850 if (errstring) { 851 dk_makedisklabel(dksc); 852 if (dksc->sc_flags & DKF_WARNLABEL) 853 printf("%s: %s\n", dksc->sc_xname, errstring); 854 return; 855 } 856 857 if ((dksc->sc_flags & DKF_LABELSANITY) == 0) 858 return; 859 860 /* Sanity check */ 861 if (lp->d_secperunit < UINT32_MAX ? 862 lp->d_secperunit != dg->dg_secperunit : 863 lp->d_secperunit > dg->dg_secperunit) 864 printf("WARNING: %s: total sector size in disklabel (%ju) " 865 "!= the size of %s (%ju)\n", dksc->sc_xname, 866 (uintmax_t)lp->d_secperunit, dksc->sc_xname, 867 (uintmax_t)dg->dg_secperunit); 868 869 for (i=0; i < lp->d_npartitions; i++) { 870 pp = &lp->d_partitions[i]; 871 if (pp->p_offset + pp->p_size > dg->dg_secperunit) 872 printf("WARNING: %s: end of partition `%c' exceeds " 873 "the size of %s (%ju)\n", dksc->sc_xname, 874 'a' + i, dksc->sc_xname, 875 (uintmax_t)dg->dg_secperunit); 876 } 877 } 878 879 /* ARGSUSED */ 880 static void 881 dk_makedisklabel(struct dk_softc *dksc) 882 { 883 struct disklabel *lp = dksc->sc_dkdev.dk_label; 884 885 lp->d_partitions[RAW_PART].p_fstype = FS_BSDFFS; 886 strlcpy(lp->d_packname, "default label", sizeof(lp->d_packname)); 887 lp->d_checksum = dkcksum(lp); 888 } 889 890 /* This function is taken from ccd.c:1.76 --rcd */ 891 892 /* 893 * XXX this function looks too generic for dksubr.c, shouldn't we 894 * put it somewhere better? 895 */ 896 897 /* 898 * Lookup the provided name in the filesystem. If the file exists, 899 * is a valid block device, and isn't being used by anyone else, 900 * set *vpp to the file's vnode. 901 */ 902 int 903 dk_lookup(struct pathbuf *pb, struct lwp *l, struct vnode **vpp) 904 { 905 struct nameidata nd; 906 struct vnode *vp; 907 int error; 908 909 if (l == NULL) 910 return ESRCH; /* Is ESRCH the best choice? */ 911 912 NDINIT(&nd, LOOKUP, FOLLOW, pb); 913 if ((error = vn_open(&nd, FREAD | FWRITE, 0)) != 0) { 914 DPRINTF((DKDB_FOLLOW|DKDB_INIT), 915 ("%s: vn_open error = %d\n", __func__, error)); 916 return error; 917 } 918 919 vp = nd.ni_vp; 920 if (vp->v_type != VBLK) { 921 error = ENOTBLK; 922 goto out; 923 } 924 925 /* Reopen as anonymous vnode to protect against forced unmount. */ 926 if ((error = bdevvp(vp->v_rdev, vpp)) != 0) 927 goto out; 928 VOP_UNLOCK(vp); 929 if ((error = vn_close(vp, FREAD | FWRITE, l->l_cred)) != 0) { 930 vrele(*vpp); 931 return error; 932 } 933 if ((error = VOP_OPEN(*vpp, FREAD | FWRITE, l->l_cred)) != 0) { 934 vrele(*vpp); 935 return error; 936 } 937 mutex_enter((*vpp)->v_interlock); 938 (*vpp)->v_writecount++; 939 mutex_exit((*vpp)->v_interlock); 940 941 IFDEBUG(DKDB_VNODE, vprint("dk_lookup: vnode info", *vpp)); 942 943 return 0; 944 out: 945 VOP_UNLOCK(vp); 946 (void) vn_close(vp, FREAD | FWRITE, l->l_cred); 947 return error; 948 } 949 950 MODULE(MODULE_CLASS_MISC, dk_subr, NULL); 951 952 static int 953 dk_subr_modcmd(modcmd_t cmd, void *arg) 954 { 955 switch (cmd) { 956 case MODULE_CMD_INIT: 957 case MODULE_CMD_FINI: 958 return 0; 959 case MODULE_CMD_STAT: 960 case MODULE_CMD_AUTOUNLOAD: 961 default: 962 return ENOTTY; 963 } 964 } 965
Indexes created Mon Oct 20 20:10:13 GMT 2025