1 /* $OpenBSD: subr_disk.c,v 1.232 2017/08/07 11:50:58 kettenis Exp $ */ 2 /* $NetBSD: subr_disk.c,v 1.17 1996/03/16 23:17:08 christos Exp $ */ 3 4 /* 5 * Copyright (c) 1995 Jason R. Thorpe. All rights reserved. 6 * Copyright (c) 1982, 1986, 1988, 1993 7 * The Regents of the University of California. All rights reserved. 8 * (c) UNIX System Laboratories, Inc. 9 * All or some portions of this file are derived from material licensed 10 * to the University of California by American Telephone and Telegraph 11 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 12 * the permission of UNIX System Laboratories, Inc. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)ufs_disksubr.c 8.5 (Berkeley) 1/21/94 39 */ 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/malloc.h> 45 #include <sys/fcntl.h> 46 #include <sys/buf.h> 47 #include <sys/stat.h> 48 #include <sys/syslog.h> 49 #include <sys/device.h> 50 #include <sys/time.h> 51 #include <sys/disklabel.h> 52 #include <sys/conf.h> 53 #include <sys/lock.h> 54 #include <sys/disk.h> 55 #include <sys/reboot.h> 56 #include <sys/dkio.h> 57 #include <sys/vnode.h> 58 #include <sys/task.h> 59 #include <sys/stdint.h> 60 61 #include <sys/socket.h> 62 #include <sys/socketvar.h> 63 64 #include <net/if.h> 65 66 #include <dev/rndvar.h> 67 #include <dev/cons.h> 68 69 #include <lib/libz/zlib.h> 70 71 #include "softraid.h" 72 73 #ifdef DEBUG 74 #define DPRINTF(x...) printf(x) 75 #else 76 #define DPRINTF(x...) 77 #endif 78 79 /* 80 * A global list of all disks attached to the system. May grow or 81 * shrink over time. 82 */ 83 struct disklist_head disklist; /* TAILQ_HEAD */ 84 int disk_count; /* number of drives in global disklist */ 85 int disk_change; /* set if a disk has been attached/detached 86 * since last we looked at this variable. This 87 * is reset by hw_sysctl() 88 */ 89 90 #define DUID_SIZE 8 91 92 u_char bootduid[DUID_SIZE]; /* DUID of boot disk. */ 93 u_char rootduid[DUID_SIZE]; /* DUID of root disk. */ 94 95 /* softraid callback, do not use! */ 96 void (*softraid_disk_attach)(struct disk *, int); 97 98 void sr_map_root(void); 99 100 struct disk_attach_task { 101 struct task task; 102 struct disk *dk; 103 }; 104 105 void disk_attach_callback(void *); 106 107 int spoofgptlabel(struct buf *, void (*)(struct buf *), struct disklabel *); 108 109 int gpt_chk_mbr(struct dos_partition *, u_int64_t); 110 int gpt_chk_hdr(struct gpt_header *, struct disklabel *); 111 int gpt_chk_parts(struct gpt_header *, struct gpt_partition *); 112 int gpt_get_fstype(struct uuid *); 113 114 int duid_equal(u_char *, u_char *); 115 116 /* 117 * Compute checksum for disk label. 118 */ 119 u_int 120 dkcksum(struct disklabel *lp) 121 { 122 u_int16_t *start, *end; 123 u_int16_t sum = 0; 124 125 start = (u_int16_t *)lp; 126 end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions]; 127 while (start < end) 128 sum ^= *start++; 129 return (sum); 130 } 131 132 int 133 initdisklabel(struct disklabel *lp) 134 { 135 int i; 136 137 /* minimal requirements for archetypal disk label */ 138 if (lp->d_secsize < DEV_BSIZE) 139 lp->d_secsize = DEV_BSIZE; 140 if (DL_GETDSIZE(lp) == 0) 141 DL_SETDSIZE(lp, MAXDISKSIZE); 142 if (lp->d_secpercyl == 0) 143 return (ERANGE); 144 lp->d_npartitions = MAXPARTITIONS; 145 for (i = 0; i < RAW_PART; i++) { 146 DL_SETPSIZE(&lp->d_partitions[i], 0); 147 DL_SETPOFFSET(&lp->d_partitions[i], 0); 148 } 149 if (DL_GETPSIZE(&lp->d_partitions[RAW_PART]) == 0) 150 DL_SETPSIZE(&lp->d_partitions[RAW_PART], DL_GETDSIZE(lp)); 151 DL_SETPOFFSET(&lp->d_partitions[RAW_PART], 0); 152 DL_SETBSTART(lp, 0); 153 DL_SETBEND(lp, DL_GETDSIZE(lp)); 154 lp->d_version = 1; 155 lp->d_bbsize = 8192; 156 lp->d_sbsize = 64*1024; /* XXX ? */ 157 return (0); 158 } 159 160 /* 161 * Check an incoming block to make sure it is a disklabel, convert it to 162 * a newer version if needed, etc etc. 163 */ 164 int 165 checkdisklabel(void *rlp, struct disklabel *lp, u_int64_t boundstart, 166 u_int64_t boundend) 167 { 168 struct disklabel *dlp = rlp; 169 struct __partitionv0 *v0pp; 170 struct partition *pp; 171 u_int64_t disksize; 172 int error = 0; 173 int i; 174 175 if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) 176 error = ENOENT; /* no disk label */ 177 else if (dlp->d_npartitions > MAXPARTITIONS) 178 error = E2BIG; /* too many partitions */ 179 else if (dlp->d_secpercyl == 0) 180 error = EINVAL; /* invalid label */ 181 else if (dlp->d_secsize == 0) 182 error = ENOSPC; /* disk too small */ 183 else if (dkcksum(dlp) != 0) 184 error = EINVAL; /* incorrect checksum */ 185 186 if (error) { 187 u_int16_t *start, *end, sum = 0; 188 189 /* If it is byte-swapped, attempt to convert it */ 190 if (swap32(dlp->d_magic) != DISKMAGIC || 191 swap32(dlp->d_magic2) != DISKMAGIC || 192 swap16(dlp->d_npartitions) > MAXPARTITIONS) 193 return (error); 194 195 /* 196 * Need a byte-swap aware dkcksum variant 197 * inlined, because dkcksum uses a sub-field 198 */ 199 start = (u_int16_t *)dlp; 200 end = (u_int16_t *)&dlp->d_partitions[ 201 swap16(dlp->d_npartitions)]; 202 while (start < end) 203 sum ^= *start++; 204 if (sum != 0) 205 return (error); 206 207 dlp->d_magic = swap32(dlp->d_magic); 208 dlp->d_type = swap16(dlp->d_type); 209 210 /* d_typename and d_packname are strings */ 211 212 dlp->d_secsize = swap32(dlp->d_secsize); 213 dlp->d_nsectors = swap32(dlp->d_nsectors); 214 dlp->d_ntracks = swap32(dlp->d_ntracks); 215 dlp->d_ncylinders = swap32(dlp->d_ncylinders); 216 dlp->d_secpercyl = swap32(dlp->d_secpercyl); 217 dlp->d_secperunit = swap32(dlp->d_secperunit); 218 219 /* d_uid is a string */ 220 221 dlp->d_acylinders = swap32(dlp->d_acylinders); 222 223 dlp->d_flags = swap32(dlp->d_flags); 224 225 for (i = 0; i < NDDATA; i++) 226 dlp->d_drivedata[i] = swap32(dlp->d_drivedata[i]); 227 228 dlp->d_secperunith = swap16(dlp->d_secperunith); 229 dlp->d_version = swap16(dlp->d_version); 230 231 for (i = 0; i < NSPARE; i++) 232 dlp->d_spare[i] = swap32(dlp->d_spare[i]); 233 234 dlp->d_magic2 = swap32(dlp->d_magic2); 235 236 dlp->d_npartitions = swap16(dlp->d_npartitions); 237 dlp->d_bbsize = swap32(dlp->d_bbsize); 238 dlp->d_sbsize = swap32(dlp->d_sbsize); 239 240 for (i = 0; i < MAXPARTITIONS; i++) { 241 pp = &dlp->d_partitions[i]; 242 pp->p_size = swap32(pp->p_size); 243 pp->p_offset = swap32(pp->p_offset); 244 if (dlp->d_version == 0) { 245 v0pp = (struct __partitionv0 *)pp; 246 v0pp->p_fsize = swap32(v0pp->p_fsize); 247 } else { 248 pp->p_offseth = swap16(pp->p_offseth); 249 pp->p_sizeh = swap16(pp->p_sizeh); 250 } 251 pp->p_cpg = swap16(pp->p_cpg); 252 } 253 254 dlp->d_checksum = 0; 255 dlp->d_checksum = dkcksum(dlp); 256 error = 0; 257 } 258 259 /* XXX should verify lots of other fields and whine a lot */ 260 261 /* Initial passed in lp contains the real disk size. */ 262 disksize = DL_GETDSIZE(lp); 263 264 if (lp != dlp) 265 *lp = *dlp; 266 267 if (lp->d_version == 0) { 268 lp->d_version = 1; 269 lp->d_secperunith = 0; 270 271 v0pp = (struct __partitionv0 *)lp->d_partitions; 272 pp = lp->d_partitions; 273 for (i = 0; i < lp->d_npartitions; i++, pp++, v0pp++) { 274 pp->p_fragblock = DISKLABELV1_FFS_FRAGBLOCK(v0pp-> 275 p_fsize, v0pp->p_frag); 276 pp->p_offseth = 0; 277 pp->p_sizeh = 0; 278 } 279 } 280 281 #ifdef DEBUG 282 if (DL_GETDSIZE(lp) != disksize) 283 printf("on-disk disklabel has incorrect disksize (%llu)\n", 284 DL_GETDSIZE(lp)); 285 if (DL_GETPSIZE(&lp->d_partitions[RAW_PART]) != disksize) 286 printf("on-disk disklabel RAW_PART has incorrect size (%llu)\n", 287 DL_GETPSIZE(&lp->d_partitions[RAW_PART])); 288 if (DL_GETPOFFSET(&lp->d_partitions[RAW_PART]) != 0) 289 printf("on-disk disklabel RAW_PART offset != 0 (%llu)\n", 290 DL_GETPOFFSET(&lp->d_partitions[RAW_PART])); 291 #endif 292 DL_SETDSIZE(lp, disksize); 293 DL_SETPSIZE(&lp->d_partitions[RAW_PART], disksize); 294 DL_SETPOFFSET(&lp->d_partitions[RAW_PART], 0); 295 DL_SETBSTART(lp, boundstart); 296 DL_SETBEND(lp, boundend < DL_GETDSIZE(lp) ? boundend : DL_GETDSIZE(lp)); 297 298 lp->d_checksum = 0; 299 lp->d_checksum = dkcksum(lp); 300 return (0); 301 } 302 303 /* 304 * Read a disk sector. 305 */ 306 int 307 readdisksector(struct buf *bp, void (*strat)(struct buf *), 308 struct disklabel *lp, u_int64_t sector) 309 { 310 bp->b_blkno = DL_SECTOBLK(lp, sector); 311 bp->b_bcount = lp->d_secsize; 312 bp->b_error = 0; 313 CLR(bp->b_flags, B_READ | B_WRITE | B_DONE | B_ERROR); 314 SET(bp->b_flags, B_BUSY | B_READ | B_RAW); 315 316 (*strat)(bp); 317 318 return (biowait(bp)); 319 } 320 321 /* 322 * If dos partition table requested, attempt to load it and 323 * find disklabel inside a DOS partition. Return buffer 324 * for use in signalling errors if requested. 325 * 326 * We would like to check if each MBR has a valid BOOT_MAGIC, but 327 * we cannot because it doesn't always exist. So.. we assume the 328 * MBR is valid. 329 */ 330 int 331 readdoslabel(struct buf *bp, void (*strat)(struct buf *), 332 struct disklabel *lp, daddr_t *partoffp, int spoofonly) 333 { 334 struct disklabel *gptlp; 335 u_int64_t dospartoff = 0, dospartend = DL_GETBEND(lp); 336 int i, ourpart = -1, wander = 1, n = 0, loop = 0, offset; 337 struct dos_partition dp[NDOSPART], *dp2; 338 u_int64_t sector = DOSBBSECTOR; 339 u_int32_t extoff = 0; 340 int error; 341 342 if (lp->d_secpercyl == 0) 343 return (EINVAL); /* invalid label */ 344 if (lp->d_secsize == 0) 345 return (ENOSPC); /* disk too small */ 346 347 /* do DOS partitions in the process of getting disklabel? */ 348 349 /* 350 * Read dos partition table, follow extended partitions. 351 * Map the partitions to disklabel entries i-p 352 */ 353 while (wander && loop < DOS_MAXEBR) { 354 loop++; 355 wander = 0; 356 if (sector < extoff) 357 sector = extoff; 358 359 /* read MBR/EBR */ 360 error = readdisksector(bp, strat, lp, sector); 361 if (error) { 362 /*wrong*/ if (partoffp) 363 /*wrong*/ *partoffp = -1; 364 return (error); 365 } 366 367 bcopy(bp->b_data + DOSPARTOFF, dp, sizeof(dp)); 368 369 if (n == 0 && sector == DOSBBSECTOR) { 370 u_int16_t mbrtest; 371 372 /* Check the end of sector marker. */ 373 mbrtest = ((bp->b_data[510] << 8) & 0xff00) | 374 (bp->b_data[511] & 0xff); 375 if (mbrtest != 0x55aa) 376 goto notmbr; 377 378 if (gpt_chk_mbr(dp, DL_GETDSIZE(lp)) != 0) 379 goto notgpt; 380 381 gptlp = malloc(sizeof(struct disklabel), M_DEVBUF, 382 M_NOWAIT); 383 if (gptlp == NULL) 384 return (ENOMEM); 385 *gptlp = *lp; 386 error = spoofgptlabel(bp, strat, gptlp); 387 if (error == 0) { 388 dospartoff = DL_GETBSTART(gptlp); 389 dospartend = DL_GETBEND(gptlp); 390 if (partoffp) { 391 if (dospartoff == 0) 392 return (ENXIO); 393 else 394 goto notfat; 395 } 396 *lp = *gptlp; 397 free(gptlp, M_DEVBUF, 398 sizeof(struct disklabel)); 399 goto notfat; 400 } else { 401 free(gptlp, M_DEVBUF, 402 sizeof(struct disklabel)); 403 goto notmbr; 404 } 405 } 406 407 notgpt: 408 if (ourpart == -1) { 409 /* Search for our MBR partition */ 410 for (dp2=dp, i=0; i < NDOSPART && ourpart == -1; 411 i++, dp2++) 412 if (letoh32(dp2->dp_size) && 413 dp2->dp_typ == DOSPTYP_OPENBSD) 414 ourpart = i; 415 if (ourpart == -1) 416 goto donot; 417 /* 418 * This is our MBR partition. need sector 419 * address for SCSI/IDE, cylinder for 420 * ESDI/ST506/RLL 421 */ 422 dp2 = &dp[ourpart]; 423 dospartoff = letoh32(dp2->dp_start) + sector; 424 dospartend = dospartoff + letoh32(dp2->dp_size); 425 426 /* 427 * Record the OpenBSD partition's placement (in 428 * 512-byte blocks!) for the caller. No need to 429 * finish spoofing. 430 */ 431 if (partoffp) { 432 *partoffp = DL_SECTOBLK(lp, dospartoff); 433 return (0); 434 } 435 436 if (lp->d_ntracks == 0) 437 lp->d_ntracks = dp2->dp_ehd + 1; 438 if (lp->d_nsectors == 0) 439 lp->d_nsectors = DPSECT(dp2->dp_esect); 440 if (lp->d_secpercyl == 0) 441 lp->d_secpercyl = lp->d_ntracks * 442 lp->d_nsectors; 443 } 444 donot: 445 /* 446 * In case the disklabel read below fails, we want to 447 * provide a fake label in i-p. 448 */ 449 for (dp2=dp, i=0; i < NDOSPART; i++, dp2++) { 450 struct partition *pp; 451 u_int8_t fstype; 452 453 if (dp2->dp_typ == DOSPTYP_OPENBSD || 454 dp2->dp_typ == DOSPTYP_EFI) 455 continue; 456 if (letoh32(dp2->dp_size) > DL_GETDSIZE(lp)) 457 continue; 458 if (letoh32(dp2->dp_start) > DL_GETDSIZE(lp)) 459 continue; 460 if (letoh32(dp2->dp_size) == 0) 461 continue; 462 463 switch (dp2->dp_typ) { 464 case DOSPTYP_UNUSED: 465 fstype = FS_UNUSED; 466 break; 467 468 case DOSPTYP_LINUX: 469 fstype = FS_EXT2FS; 470 break; 471 472 case DOSPTYP_NTFS: 473 fstype = FS_NTFS; 474 break; 475 476 case DOSPTYP_EFISYS: 477 case DOSPTYP_FAT12: 478 case DOSPTYP_FAT16S: 479 case DOSPTYP_FAT16B: 480 case DOSPTYP_FAT16L: 481 case DOSPTYP_FAT32: 482 case DOSPTYP_FAT32L: 483 fstype = FS_MSDOS; 484 break; 485 case DOSPTYP_EXTEND: 486 case DOSPTYP_EXTENDL: 487 sector = letoh32(dp2->dp_start) + extoff; 488 if (!extoff) { 489 extoff = letoh32(dp2->dp_start); 490 sector = 0; 491 } 492 wander = 1; 493 continue; 494 break; 495 default: 496 fstype = FS_OTHER; 497 break; 498 } 499 500 /* 501 * Don't set fstype/offset/size when just looking for 502 * the offset of the OpenBSD partition. It would 503 * invalidate the disklabel checksum! 504 * 505 * Don't try to spoof more than 8 partitions, i.e. 506 * 'i' -'p'. 507 */ 508 if (partoffp || n >= 8) 509 continue; 510 511 pp = &lp->d_partitions[8+n]; 512 n++; 513 pp->p_fstype = fstype; 514 if (letoh32(dp2->dp_start)) 515 DL_SETPOFFSET(pp, 516 letoh32(dp2->dp_start) + sector); 517 DL_SETPSIZE(pp, letoh32(dp2->dp_size)); 518 } 519 } 520 521 notmbr: 522 if (n == 0 && sector == DOSBBSECTOR && ourpart == -1) { 523 u_int16_t fattest; 524 525 /* Check for a valid initial jmp instruction. */ 526 switch ((u_int8_t)bp->b_data[0]) { 527 case 0xeb: 528 /* 529 * Two-byte jmp instruction. The 2nd byte is the number 530 * of bytes to jmp and the 3rd byte must be a NOP. 531 */ 532 if ((u_int8_t)bp->b_data[2] != 0x90) 533 goto notfat; 534 break; 535 case 0xe9: 536 /* 537 * Three-byte jmp instruction. The next two bytes are a 538 * little-endian 16 bit value. 539 */ 540 break; 541 default: 542 goto notfat; 543 break; 544 } 545 546 /* Check for a valid bytes per sector value. */ 547 fattest = ((bp->b_data[12] << 8) & 0xff00) | 548 (bp->b_data[11] & 0xff); 549 if (fattest < 512 || fattest > 4096 || (fattest % 512 != 0)) 550 goto notfat; 551 552 if (partoffp) 553 return (ENXIO); /* No place for disklabel on FAT! */ 554 555 DL_SETPSIZE(&lp->d_partitions['i' - 'a'], 556 DL_GETPSIZE(&lp->d_partitions[RAW_PART])); 557 DL_SETPOFFSET(&lp->d_partitions['i' - 'a'], 0); 558 lp->d_partitions['i' - 'a'].p_fstype = FS_MSDOS; 559 560 spoofonly = 1; /* No disklabel to read from disk. */ 561 } 562 563 notfat: 564 /* record the OpenBSD partition's placement for the caller */ 565 if (partoffp) 566 *partoffp = DL_SECTOBLK(lp, dospartoff); 567 else { 568 DL_SETBSTART(lp, dospartoff); 569 DL_SETBEND(lp, (dospartend < DL_GETDSIZE(lp)) ? dospartend : 570 DL_GETDSIZE(lp)); 571 } 572 573 /* don't read the on-disk label if we are in spoofed-only mode */ 574 if (spoofonly) 575 return (0); 576 577 error = readdisksector(bp, strat, lp, dospartoff + 578 DL_BLKTOSEC(lp, DOS_LABELSECTOR)); 579 if (error) 580 return (bp->b_error); 581 582 offset = DL_BLKOFFSET(lp, DOS_LABELSECTOR); 583 error = checkdisklabel(bp->b_data + offset, lp, 584 DL_GETBSTART((struct disklabel*)(bp->b_data+offset)), 585 DL_GETBEND((struct disklabel *)(bp->b_data+offset))); 586 587 return (error); 588 } 589 590 /* 591 * Returns 0 if the MBR with the provided partition array is a GPT protective 592 * MBR, and returns 1 otherwise. A GPT protective MBR would have one and only 593 * one MBR partition, an EFI partition that either covers the whole disk or as 594 * much of it as is possible with a 32bit size field. 595 * 596 * NOTE: MS always uses a size of UINT32_MAX for the EFI partition!** 597 */ 598 int 599 gpt_chk_mbr(struct dos_partition *dp, u_int64_t dsize) 600 { 601 struct dos_partition *dp2; 602 int efi, found, i; 603 u_int32_t psize; 604 605 found = efi = 0; 606 for (dp2=dp, i=0; i < NDOSPART; i++, dp2++) { 607 if (dp2->dp_typ == DOSPTYP_UNUSED) 608 continue; 609 found++; 610 if (dp2->dp_typ != DOSPTYP_EFI) 611 continue; 612 psize = letoh32(dp2->dp_size); 613 if (psize == (dsize - 1) || 614 psize == UINT32_MAX) { 615 if (letoh32(dp2->dp_start) == 1) 616 efi++; 617 } 618 } 619 if (found == 1 && efi == 1) 620 return (0); 621 622 return (1); 623 } 624 625 int 626 gpt_chk_hdr(struct gpt_header *gh, struct disklabel *lp) 627 { 628 uint64_t ghpartlba; 629 uint64_t ghlbaend, ghlbastart; 630 uint32_t orig_gh_csum; 631 uint32_t ghsize, ghpartsize, ghpartspersec; 632 633 if (letoh64(gh->gh_sig) != GPTSIGNATURE) 634 return (EINVAL); 635 636 if (letoh32(gh->gh_rev) != GPTREVISION) 637 return (EINVAL); 638 639 ghsize = letoh32(gh->gh_size); 640 ghpartsize = letoh32(gh->gh_part_size); 641 ghpartspersec = lp->d_secsize / ghpartsize; 642 ghpartlba = letoh64(gh->gh_part_lba); 643 ghlbaend = letoh64(gh->gh_lba_end); 644 ghlbastart = letoh64(gh->gh_lba_start); 645 646 if (ghsize < GPTMINHDRSIZE || ghsize > sizeof(struct gpt_header)) 647 return (EINVAL); 648 649 orig_gh_csum = gh->gh_csum; 650 gh->gh_csum = 0; 651 gh->gh_csum = crc32(0, (unsigned char *)gh, ghsize); 652 653 if (orig_gh_csum != gh->gh_csum) 654 return (EINVAL); 655 656 if (ghlbastart >= DL_GETDSIZE(lp) || 657 ghlbaend >= DL_GETDSIZE(lp) || 658 ghpartlba >= DL_GETDSIZE(lp)) 659 return (EINVAL); 660 661 /* 662 * Size per partition entry shall be 128*(2**n) with n >= 0. 663 * We don't support partition entries larger than block size. 664 */ 665 if (ghpartsize % GPTMINPARTSIZE || ghpartsize > lp->d_secsize 666 || ghpartspersec == 0) { 667 DPRINTF("invalid partition size\n"); 668 return (EINVAL); 669 } 670 671 /* XXX: we don't support multiples of GPTMINPARTSIZE yet */ 672 if (ghpartsize != GPTMINPARTSIZE) { 673 DPRINTF("partition sizes larger than %d bytes are not " 674 "supported", GPTMINPARTSIZE); 675 return (EINVAL); 676 } 677 678 if (letoh64(gh->gh_lba_alt) >= DL_GETDSIZE(lp)) { 679 DPRINTF("alternate header's position is bogus\n"); 680 return (EINVAL); 681 } 682 683 return 0; 684 } 685 686 int 687 gpt_chk_parts(struct gpt_header *gh, struct gpt_partition *gp) 688 { 689 u_int32_t checksum; 690 checksum = crc32(0, (unsigned char *)gp, 691 letoh32(gh->gh_part_num) * letoh32(gh->gh_part_size)); 692 693 if (checksum != gh->gh_part_csum) 694 return (EINVAL); 695 696 return 0; 697 } 698 699 int 700 gpt_get_fstype(struct uuid *uuid_part) 701 { 702 static int init = 0; 703 static struct uuid uuid_openbsd, uuid_msdos, uuid_chromefs, 704 uuid_linux, uuid_hfs, uuid_unused, uuid_efi_system; 705 static const uint8_t gpt_uuid_openbsd[] = GPT_UUID_OPENBSD; 706 static const uint8_t gpt_uuid_msdos[] = GPT_UUID_MSDOS; 707 static const uint8_t gpt_uuid_chromerootfs[] = GPT_UUID_CHROMEROOTFS; 708 static const uint8_t gpt_uuid_linux[] = GPT_UUID_LINUX; 709 static const uint8_t gpt_uuid_hfs[] = GPT_UUID_APPLE_HFS; 710 static const uint8_t gpt_uuid_unused[] = GPT_UUID_UNUSED; 711 static const uint8_t gpt_uuid_efi_system[] = GPT_UUID_EFI_SYSTEM; 712 713 if (init == 0) { 714 uuid_dec_be(gpt_uuid_openbsd, &uuid_openbsd); 715 uuid_dec_be(gpt_uuid_msdos, &uuid_msdos); 716 uuid_dec_be(gpt_uuid_chromerootfs, &uuid_chromefs); 717 uuid_dec_be(gpt_uuid_linux, &uuid_linux); 718 uuid_dec_be(gpt_uuid_hfs, &uuid_hfs); 719 uuid_dec_be(gpt_uuid_unused, &uuid_unused); 720 uuid_dec_be(gpt_uuid_efi_system, &uuid_efi_system); 721 init = 1; 722 } 723 724 if (!memcmp(uuid_part, &uuid_unused, sizeof(struct uuid))) 725 return FS_UNUSED; 726 else if (!memcmp(uuid_part, &uuid_openbsd, sizeof(struct uuid))) 727 return FS_BSDFFS; 728 else if (!memcmp(uuid_part, &uuid_msdos, sizeof(struct uuid))) 729 return FS_MSDOS; 730 else if (!memcmp(uuid_part, &uuid_chromefs, sizeof(struct uuid))) 731 return FS_EXT2FS; 732 else if (!memcmp(uuid_part, &uuid_linux, sizeof(struct uuid))) 733 return FS_EXT2FS; 734 else if (!memcmp(uuid_part, &uuid_hfs, sizeof(struct uuid))) 735 return FS_HFS; 736 else if (!memcmp(uuid_part, &uuid_efi_system, sizeof(struct uuid))) 737 return FS_MSDOS; 738 else 739 return FS_OTHER; 740 } 741 742 /* 743 * Spoof a disklabel based on the GPT information on the disk. 744 */ 745 int 746 spoofgptlabel(struct buf *bp, void (*strat)(struct buf *), 747 struct disklabel *lp) 748 { 749 static const u_int8_t gpt_uuid_openbsd[] = GPT_UUID_OPENBSD; 750 struct gpt_header gh; 751 struct uuid uuid_part, uuid_openbsd; 752 struct gpt_partition *gp, *gp_tmp; 753 struct partition *pp; 754 size_t gpsz; 755 u_int64_t ghlbaend, ghlbastart, gptpartoff, gptpartend, sector; 756 u_int64_t start, end; 757 int i, altheader = 0, error, n; 758 uint32_t ghpartnum; 759 760 uuid_dec_be(gpt_uuid_openbsd, &uuid_openbsd); 761 762 for (sector = GPTSECTOR; ; sector = DL_GETDSIZE(lp)-1, altheader = 1) { 763 uint64_t ghpartlba; 764 uint32_t ghpartsize; 765 uint32_t ghpartspersec; 766 767 error = readdisksector(bp, strat, lp, sector); 768 if (error) { 769 DPRINTF("error reading from disk\n"); 770 return (error); 771 } 772 773 bcopy(bp->b_data, &gh, sizeof(gh)); 774 775 if (gpt_chk_hdr(&gh, lp)) { 776 if (altheader) { 777 DPRINTF("alternate header also broken\n"); 778 return (EINVAL); 779 } 780 continue; 781 } 782 783 ghpartsize = letoh32(gh.gh_part_size); 784 ghpartspersec = lp->d_secsize / ghpartsize; 785 ghpartnum = letoh32(gh.gh_part_num); 786 ghpartlba = letoh64(gh.gh_part_lba); 787 ghlbaend = letoh64(gh.gh_lba_end); 788 ghlbastart = letoh64(gh.gh_lba_start); 789 790 /* read GPT partition entry array */ 791 gp = mallocarray(ghpartnum, sizeof(struct gpt_partition), 792 M_DEVBUF, M_NOWAIT|M_ZERO); 793 if (gp == NULL) 794 return (ENOMEM); 795 gpsz = ghpartnum * sizeof(struct gpt_partition); 796 797 /* 798 * XXX: Fails if # of partition entries is not a multiple of 799 * ghpartspersec. 800 */ 801 sector = ghpartlba; 802 for (i = 0; i < ghpartnum / ghpartspersec; i++, sector++) { 803 error = readdisksector(bp, strat, lp, sector); 804 if (error) { 805 free(gp, M_DEVBUF, gpsz); 806 return (error); 807 } 808 809 bcopy(bp->b_data, gp + i * ghpartspersec, 810 ghpartspersec * sizeof(struct gpt_partition)); 811 } 812 813 if (gpt_chk_parts(&gh, gp)) { 814 free(gp, M_DEVBUF, gpsz); 815 if (altheader) { 816 DPRINTF("alternate partition entries are also " 817 "broken\n"); 818 return (EINVAL); 819 } 820 continue; 821 } 822 break; 823 } 824 825 /* Find OpenBSD partition and spoof others along the way. */ 826 n = 0; 827 gptpartoff = 0; 828 gptpartend = DL_GETBEND(lp); 829 for (gp_tmp = gp, i = 0; i < ghpartnum; gp_tmp++, i++) { 830 start = letoh64(gp_tmp->gp_lba_start); 831 end = letoh64(gp_tmp->gp_lba_end); 832 if (start > end || start < ghlbastart || end > ghlbaend) 833 continue; /* entry invalid */ 834 835 uuid_dec_le(&gp_tmp->gp_type, &uuid_part); 836 if (!memcmp(&uuid_part, &uuid_openbsd, sizeof(struct uuid))) { 837 if (gptpartoff == 0) { 838 gptpartoff = start; 839 gptpartend = end + 1; 840 } 841 continue; /* Do *NOT* spoof OpenBSD partitions! */ 842 } 843 844 /* 845 * Don't try to spoof more than 8 partitions, i.e. 846 * 'i' -'p'. 847 */ 848 if (n >= 8) 849 continue; 850 851 pp = &lp->d_partitions[8+n]; 852 n++; 853 pp->p_fstype = gpt_get_fstype(&uuid_part); 854 DL_SETPOFFSET(pp, start); 855 DL_SETPSIZE(pp, end - start + 1); 856 } 857 858 free(gp, M_DEVBUF, gpsz); 859 860 DL_SETBSTART(lp, gptpartoff); 861 DL_SETBEND(lp, (gptpartend < DL_GETDSIZE(lp)) ? gptpartend : 862 DL_GETDSIZE(lp)); 863 864 return (0); 865 } 866 867 /* 868 * Check new disk label for sensibility before setting it. 869 */ 870 int 871 setdisklabel(struct disklabel *olp, struct disklabel *nlp, u_int openmask) 872 { 873 struct partition *opp, *npp; 874 struct disk *dk; 875 int i; 876 877 /* sanity clause */ 878 if (nlp->d_secpercyl == 0 || nlp->d_secsize == 0 || 879 (nlp->d_secsize % DEV_BSIZE) != 0) 880 return (EINVAL); 881 882 /* special case to allow disklabel to be invalidated */ 883 if (nlp->d_magic == 0xffffffff) { 884 *olp = *nlp; 885 return (0); 886 } 887 888 if (nlp->d_magic != DISKMAGIC || nlp->d_magic2 != DISKMAGIC || 889 dkcksum(nlp) != 0) 890 return (EINVAL); 891 892 /* XXX missing check if other dos partitions will be overwritten */ 893 894 for (i = 0; i < MAXPARTITIONS; i++) { 895 opp = &olp->d_partitions[i]; 896 npp = &nlp->d_partitions[i]; 897 if ((openmask & (1 << i)) && 898 (DL_GETPOFFSET(npp) != DL_GETPOFFSET(opp) || 899 DL_GETPSIZE(npp) < DL_GETPSIZE(opp))) 900 return (EBUSY); 901 /* 902 * Copy internally-set partition information 903 * if new label doesn't include it. XXX 904 */ 905 if (npp->p_fstype == FS_UNUSED && opp->p_fstype != FS_UNUSED) { 906 npp->p_fragblock = opp->p_fragblock; 907 npp->p_cpg = opp->p_cpg; 908 } 909 } 910 911 /* Generate a UID if the disklabel does not already have one. */ 912 if (duid_iszero(nlp->d_uid)) { 913 do { 914 arc4random_buf(nlp->d_uid, sizeof(nlp->d_uid)); 915 TAILQ_FOREACH(dk, &disklist, dk_link) 916 if (dk->dk_label && 917 duid_equal(dk->dk_label->d_uid, nlp->d_uid)) 918 break; 919 } while (dk != NULL || duid_iszero(nlp->d_uid)); 920 } 921 922 /* Preserve the disk size and RAW_PART values. */ 923 DL_SETDSIZE(nlp, DL_GETDSIZE(olp)); 924 npp = &nlp->d_partitions[RAW_PART]; 925 DL_SETPOFFSET(npp, 0); 926 DL_SETPSIZE(npp, DL_GETDSIZE(nlp)); 927 928 nlp->d_checksum = 0; 929 nlp->d_checksum = dkcksum(nlp); 930 *olp = *nlp; 931 932 disk_change = 1; 933 934 return (0); 935 } 936 937 /* 938 * Determine the size of the transfer, and make sure it is within the 939 * boundaries of the partition. Adjust transfer if needed, and signal errors or 940 * early completion. 941 */ 942 int 943 bounds_check_with_label(struct buf *bp, struct disklabel *lp) 944 { 945 struct partition *p = &lp->d_partitions[DISKPART(bp->b_dev)]; 946 daddr_t partblocks, sz; 947 948 /* Avoid division by zero, negative offsets, and negative sizes. */ 949 if (lp->d_secpercyl == 0 || bp->b_blkno < 0 || bp->b_bcount < 0) 950 goto bad; 951 952 /* Ensure transfer is a whole number of aligned sectors. */ 953 if ((bp->b_blkno % DL_BLKSPERSEC(lp)) != 0 || 954 (bp->b_bcount % lp->d_secsize) != 0) 955 goto bad; 956 957 /* Ensure transfer starts within partition boundary. */ 958 partblocks = DL_SECTOBLK(lp, DL_GETPSIZE(p)); 959 if (bp->b_blkno > partblocks) 960 goto bad; 961 962 /* If exactly at end of partition or null transfer, return EOF. */ 963 if (bp->b_blkno == partblocks || bp->b_bcount == 0) 964 goto done; 965 966 /* Truncate request if it extends past the end of the partition. */ 967 sz = bp->b_bcount >> DEV_BSHIFT; 968 if (sz > partblocks - bp->b_blkno) { 969 sz = partblocks - bp->b_blkno; 970 bp->b_bcount = sz << DEV_BSHIFT; 971 } 972 973 return (0); 974 975 bad: 976 bp->b_error = EINVAL; 977 bp->b_flags |= B_ERROR; 978 done: 979 bp->b_resid = bp->b_bcount; 980 return (-1); 981 } 982 983 /* 984 * Disk error is the preface to plaintive error messages 985 * about failing disk transfers. It prints messages of the form 986 987 hp0g: hard error reading fsbn 12345 of 12344-12347 (hp0 bn %d cn %d tn %d sn %d) 988 989 * if the offset of the error in the transfer and a disk label 990 * are both available. blkdone should be -1 if the position of the error 991 * is unknown; the disklabel pointer may be null from drivers that have not 992 * been converted to use them. The message is printed with printf 993 * if pri is LOG_PRINTF, otherwise it uses log at the specified priority. 994 * The message should be completed (with at least a newline) with printf 995 * or addlog, respectively. There is no trailing space. 996 */ 997 void 998 diskerr(struct buf *bp, char *dname, char *what, int pri, int blkdone, 999 struct disklabel *lp) 1000 { 1001 int unit = DISKUNIT(bp->b_dev), part = DISKPART(bp->b_dev); 1002 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2))); 1003 char partname = 'a' + part; 1004 daddr_t sn; 1005 1006 if (pri != LOG_PRINTF) { 1007 log(pri, "%s", ""); 1008 pr = addlog; 1009 } else 1010 pr = printf; 1011 (*pr)("%s%d%c: %s %sing fsbn ", dname, unit, partname, what, 1012 bp->b_flags & B_READ ? "read" : "writ"); 1013 sn = bp->b_blkno; 1014 if (bp->b_bcount <= DEV_BSIZE) 1015 (*pr)("%lld", (long long)sn); 1016 else { 1017 if (blkdone >= 0) { 1018 sn += blkdone; 1019 (*pr)("%lld of ", (long long)sn); 1020 } 1021 (*pr)("%lld-%lld", (long long)bp->b_blkno, 1022 (long long)(bp->b_blkno + (bp->b_bcount - 1) / DEV_BSIZE)); 1023 } 1024 if (lp && (blkdone >= 0 || bp->b_bcount <= lp->d_secsize)) { 1025 sn += DL_SECTOBLK(lp, DL_GETPOFFSET(&lp->d_partitions[part])); 1026 (*pr)(" (%s%d bn %lld; cn %lld", dname, unit, (long long)sn, 1027 (long long)(sn / DL_SECTOBLK(lp, lp->d_secpercyl))); 1028 sn %= DL_SECTOBLK(lp, lp->d_secpercyl); 1029 (*pr)(" tn %lld sn %lld)", 1030 (long long)(sn / DL_SECTOBLK(lp, lp->d_nsectors)), 1031 (long long)(sn % DL_SECTOBLK(lp, lp->d_nsectors))); 1032 } 1033 } 1034 1035 /* 1036 * Initialize the disklist. Called by main() before autoconfiguration. 1037 */ 1038 void 1039 disk_init(void) 1040 { 1041 1042 TAILQ_INIT(&disklist); 1043 disk_count = disk_change = 0; 1044 } 1045 1046 int 1047 disk_construct(struct disk *diskp) 1048 { 1049 rw_init_flags(&diskp->dk_lock, "dklk", RWL_IS_VNODE); 1050 mtx_init(&diskp->dk_mtx, IPL_BIO); 1051 1052 diskp->dk_flags |= DKF_CONSTRUCTED; 1053 1054 return (0); 1055 } 1056 1057 /* 1058 * Attach a disk. 1059 */ 1060 void 1061 disk_attach(struct device *dv, struct disk *diskp) 1062 { 1063 int majdev; 1064 1065 if (!ISSET(diskp->dk_flags, DKF_CONSTRUCTED)) 1066 disk_construct(diskp); 1067 1068 /* 1069 * Allocate and initialize the disklabel structures. Note that 1070 * it's not safe to sleep here, since we're probably going to be 1071 * called during autoconfiguration. 1072 */ 1073 diskp->dk_label = malloc(sizeof(struct disklabel), M_DEVBUF, 1074 M_NOWAIT|M_ZERO); 1075 if (diskp->dk_label == NULL) 1076 panic("disk_attach: can't allocate storage for disklabel"); 1077 1078 /* 1079 * Set the attached timestamp. 1080 */ 1081 microuptime(&diskp->dk_attachtime); 1082 1083 /* 1084 * Link into the disklist. 1085 */ 1086 TAILQ_INSERT_TAIL(&disklist, diskp, dk_link); 1087 ++disk_count; 1088 disk_change = 1; 1089 1090 /* 1091 * Store device structure and number for later use. 1092 */ 1093 diskp->dk_device = dv; 1094 diskp->dk_devno = NODEV; 1095 if (dv != NULL) { 1096 majdev = findblkmajor(dv); 1097 if (majdev >= 0) 1098 diskp->dk_devno = 1099 MAKEDISKDEV(majdev, dv->dv_unit, RAW_PART); 1100 1101 if (diskp->dk_devno != NODEV) { 1102 struct disk_attach_task *dat; 1103 1104 dat = malloc(sizeof(*dat), M_TEMP, M_WAITOK); 1105 1106 /* XXX: Assumes dk is part of the device softc. */ 1107 device_ref(dv); 1108 dat->dk = diskp; 1109 1110 task_set(&dat->task, disk_attach_callback, dat); 1111 task_add(systq, &dat->task); 1112 } 1113 } 1114 1115 if (softraid_disk_attach) 1116 softraid_disk_attach(diskp, 1); 1117 } 1118 1119 void 1120 disk_attach_callback(void *xdat) 1121 { 1122 struct disk_attach_task *dat = xdat; 1123 struct disk *dk = dat->dk; 1124 struct disklabel dl; 1125 char errbuf[100]; 1126 1127 free(dat, M_TEMP, sizeof(*dat)); 1128 1129 if (dk->dk_flags & (DKF_OPENED | DKF_NOLABELREAD)) 1130 goto done; 1131 1132 /* Read disklabel. */ 1133 if (disk_readlabel(&dl, dk->dk_devno, errbuf, sizeof(errbuf)) == NULL) { 1134 add_timer_randomness(dl.d_checksum); 1135 dk->dk_flags |= DKF_LABELVALID; 1136 } 1137 1138 done: 1139 dk->dk_flags |= DKF_OPENED; 1140 device_unref(dk->dk_device); 1141 wakeup(dk); 1142 } 1143 1144 /* 1145 * Detach a disk. 1146 */ 1147 void 1148 disk_detach(struct disk *diskp) 1149 { 1150 1151 if (softraid_disk_attach) 1152 softraid_disk_attach(diskp, -1); 1153 1154 /* 1155 * Free the space used by the disklabel structures. 1156 */ 1157 free(diskp->dk_label, M_DEVBUF, sizeof(*diskp->dk_label)); 1158 1159 /* 1160 * Remove from the disklist. 1161 */ 1162 TAILQ_REMOVE(&disklist, diskp, dk_link); 1163 disk_change = 1; 1164 if (--disk_count < 0) 1165 panic("disk_detach: disk_count < 0"); 1166 } 1167 1168 int 1169 disk_openpart(struct disk *dk, int part, int fmt, int haslabel) 1170 { 1171 KASSERT(part >= 0 && part < MAXPARTITIONS); 1172 1173 /* Unless opening the raw partition, check that the partition exists. */ 1174 if (part != RAW_PART && (!haslabel || 1175 part >= dk->dk_label->d_npartitions || 1176 dk->dk_label->d_partitions[part].p_fstype == FS_UNUSED)) 1177 return (ENXIO); 1178 1179 /* Ensure the partition doesn't get changed under our feet. */ 1180 switch (fmt) { 1181 case S_IFCHR: 1182 dk->dk_copenmask |= (1 << part); 1183 break; 1184 case S_IFBLK: 1185 dk->dk_bopenmask |= (1 << part); 1186 break; 1187 } 1188 dk->dk_openmask = dk->dk_copenmask | dk->dk_bopenmask; 1189 1190 return (0); 1191 } 1192 1193 void 1194 disk_closepart(struct disk *dk, int part, int fmt) 1195 { 1196 KASSERT(part >= 0 && part < MAXPARTITIONS); 1197 1198 switch (fmt) { 1199 case S_IFCHR: 1200 dk->dk_copenmask &= ~(1 << part); 1201 break; 1202 case S_IFBLK: 1203 dk->dk_bopenmask &= ~(1 << part); 1204 break; 1205 } 1206 dk->dk_openmask = dk->dk_copenmask | dk->dk_bopenmask; 1207 } 1208 1209 void 1210 disk_gone(int (*open)(dev_t, int, int, struct proc *), int unit) 1211 { 1212 int bmaj, cmaj, mn; 1213 1214 /* Locate the lowest minor number to be detached. */ 1215 mn = DISKMINOR(unit, 0); 1216 1217 for (bmaj = 0; bmaj < nblkdev; bmaj++) 1218 if (bdevsw[bmaj].d_open == open) 1219 vdevgone(bmaj, mn, mn + MAXPARTITIONS - 1, VBLK); 1220 for (cmaj = 0; cmaj < nchrdev; cmaj++) 1221 if (cdevsw[cmaj].d_open == open) 1222 vdevgone(cmaj, mn, mn + MAXPARTITIONS - 1, VCHR); 1223 } 1224 1225 /* 1226 * Increment a disk's busy counter. If the counter is going from 1227 * 0 to 1, set the timestamp. 1228 */ 1229 void 1230 disk_busy(struct disk *diskp) 1231 { 1232 1233 /* 1234 * XXX We'd like to use something as accurate as microtime(), 1235 * but that doesn't depend on the system TOD clock. 1236 */ 1237 mtx_enter(&diskp->dk_mtx); 1238 if (diskp->dk_busy++ == 0) 1239 microuptime(&diskp->dk_timestamp); 1240 mtx_leave(&diskp->dk_mtx); 1241 } 1242 1243 /* 1244 * Decrement a disk's busy counter, increment the byte count, total busy 1245 * time, and reset the timestamp. 1246 */ 1247 void 1248 disk_unbusy(struct disk *diskp, long bcount, daddr_t blkno, int read) 1249 { 1250 struct timeval dv_time, diff_time; 1251 1252 mtx_enter(&diskp->dk_mtx); 1253 1254 if (diskp->dk_busy-- == 0) 1255 printf("disk_unbusy: %s: dk_busy < 0\n", diskp->dk_name); 1256 1257 microuptime(&dv_time); 1258 1259 timersub(&dv_time, &diskp->dk_timestamp, &diff_time); 1260 timeradd(&diskp->dk_time, &diff_time, &diskp->dk_time); 1261 1262 diskp->dk_timestamp = dv_time; 1263 if (bcount > 0) { 1264 if (read) { 1265 diskp->dk_rbytes += bcount; 1266 diskp->dk_rxfer++; 1267 } else { 1268 diskp->dk_wbytes += bcount; 1269 diskp->dk_wxfer++; 1270 } 1271 } else 1272 diskp->dk_seek++; 1273 1274 mtx_leave(&diskp->dk_mtx); 1275 1276 add_disk_randomness(bcount ^ diff_time.tv_usec ^ 1277 (blkno >> 32) ^ (blkno & 0xffffffff)); 1278 } 1279 1280 int 1281 disk_lock(struct disk *dk) 1282 { 1283 return (rw_enter(&dk->dk_lock, RW_WRITE|RW_INTR)); 1284 } 1285 1286 void 1287 disk_lock_nointr(struct disk *dk) 1288 { 1289 rw_enter_write(&dk->dk_lock); 1290 } 1291 1292 void 1293 disk_unlock(struct disk *dk) 1294 { 1295 rw_exit_write(&dk->dk_lock); 1296 } 1297 1298 int 1299 dk_mountroot(void) 1300 { 1301 char errbuf[100]; 1302 int part = DISKPART(rootdev); 1303 int (*mountrootfn)(void); 1304 struct disklabel dl; 1305 char *error; 1306 1307 error = disk_readlabel(&dl, rootdev, errbuf, sizeof(errbuf)); 1308 if (error) 1309 panic("%s", error); 1310 1311 if (DL_GETPSIZE(&dl.d_partitions[part]) == 0) 1312 panic("root filesystem has size 0"); 1313 switch (dl.d_partitions[part].p_fstype) { 1314 #ifdef EXT2FS 1315 case FS_EXT2FS: 1316 { 1317 extern int ext2fs_mountroot(void); 1318 mountrootfn = ext2fs_mountroot; 1319 } 1320 break; 1321 #endif 1322 #ifdef FFS 1323 case FS_BSDFFS: 1324 { 1325 extern int ffs_mountroot(void); 1326 mountrootfn = ffs_mountroot; 1327 } 1328 break; 1329 #endif 1330 #ifdef CD9660 1331 case FS_ISO9660: 1332 { 1333 extern int cd9660_mountroot(void); 1334 mountrootfn = cd9660_mountroot; 1335 } 1336 break; 1337 #endif 1338 default: 1339 #ifdef FFS 1340 { 1341 extern int ffs_mountroot(void); 1342 1343 printf("filesystem type %d not known.. assuming ffs\n", 1344 dl.d_partitions[part].p_fstype); 1345 mountrootfn = ffs_mountroot; 1346 } 1347 #else 1348 panic("disk 0x%x filesystem type %d not known", 1349 rootdev, dl.d_partitions[part].p_fstype); 1350 #endif 1351 } 1352 return (*mountrootfn)(); 1353 } 1354 1355 struct device * 1356 getdisk(char *str, int len, int defpart, dev_t *devp) 1357 { 1358 struct device *dv; 1359 1360 if ((dv = parsedisk(str, len, defpart, devp)) == NULL) { 1361 printf("use one of: exit"); 1362 TAILQ_FOREACH(dv, &alldevs, dv_list) { 1363 if (dv->dv_class == DV_DISK) 1364 printf(" %s[a-p]", dv->dv_xname); 1365 #if defined(NFSCLIENT) 1366 if (dv->dv_class == DV_IFNET) 1367 printf(" %s", dv->dv_xname); 1368 #endif 1369 } 1370 printf("\n"); 1371 } 1372 return (dv); 1373 } 1374 1375 struct device * 1376 parsedisk(char *str, int len, int defpart, dev_t *devp) 1377 { 1378 struct device *dv; 1379 int majdev, part = defpart; 1380 char c; 1381 1382 if (len == 0) 1383 return (NULL); 1384 c = str[len-1]; 1385 if (c >= 'a' && (c - 'a') < MAXPARTITIONS) { 1386 part = c - 'a'; 1387 len -= 1; 1388 } 1389 1390 TAILQ_FOREACH(dv, &alldevs, dv_list) { 1391 if (dv->dv_class == DV_DISK && 1392 strncmp(str, dv->dv_xname, len) == 0 && 1393 dv->dv_xname[len] == '\0') { 1394 majdev = findblkmajor(dv); 1395 if (majdev < 0) 1396 return NULL; 1397 *devp = MAKEDISKDEV(majdev, dv->dv_unit, part); 1398 break; 1399 } 1400 #if defined(NFSCLIENT) 1401 if (dv->dv_class == DV_IFNET && 1402 strncmp(str, dv->dv_xname, len) == 0 && 1403 dv->dv_xname[len] == '\0') { 1404 *devp = NODEV; 1405 break; 1406 } 1407 #endif 1408 } 1409 1410 return (dv); 1411 } 1412 1413 void 1414 setroot(struct device *bootdv, int part, int exitflags) 1415 { 1416 int majdev, unit, len, s, slept = 0; 1417 struct swdevt *swp; 1418 struct device *rootdv, *dv; 1419 dev_t nrootdev, nswapdev = NODEV, temp = NODEV; 1420 struct ifnet *ifp = NULL; 1421 struct disk *dk; 1422 char buf[128]; 1423 #if defined(NFSCLIENT) 1424 extern char *nfsbootdevname; 1425 #endif 1426 1427 /* Ensure that all disk attach callbacks have completed. */ 1428 do { 1429 TAILQ_FOREACH(dk, &disklist, dk_link) { 1430 if (dk->dk_devno != NODEV && 1431 (dk->dk_flags & DKF_OPENED) == 0) { 1432 tsleep(dk, 0, "dkopen", hz); 1433 slept++; 1434 break; 1435 } 1436 } 1437 } while (dk != NULL && slept < 5); 1438 1439 if (slept == 5) { 1440 printf("disklabels not read:"); 1441 TAILQ_FOREACH(dk, &disklist, dk_link) 1442 if (dk->dk_devno != NODEV && 1443 (dk->dk_flags & DKF_OPENED) == 0) 1444 printf(" %s", dk->dk_name); 1445 printf("\n"); 1446 } 1447 1448 if (duid_iszero(bootduid)) { 1449 /* Locate DUID for boot disk since it was not provided. */ 1450 TAILQ_FOREACH(dk, &disklist, dk_link) 1451 if (dk->dk_device == bootdv) 1452 break; 1453 if (dk && (dk->dk_flags & DKF_LABELVALID)) 1454 bcopy(dk->dk_label->d_uid, bootduid, sizeof(bootduid)); 1455 } else if (bootdv == NULL) { 1456 /* Locate boot disk based on the provided DUID. */ 1457 TAILQ_FOREACH(dk, &disklist, dk_link) 1458 if (duid_equal(dk->dk_label->d_uid, bootduid)) 1459 break; 1460 if (dk && (dk->dk_flags & DKF_LABELVALID)) 1461 bootdv = dk->dk_device; 1462 } 1463 bcopy(bootduid, rootduid, sizeof(rootduid)); 1464 1465 #if NSOFTRAID > 0 1466 sr_map_root(); 1467 #endif 1468 1469 /* 1470 * If `swap generic' and we couldn't determine boot device, 1471 * ask the user. 1472 */ 1473 dk = NULL; 1474 if (mountroot == NULL && bootdv == NULL) 1475 boothowto |= RB_ASKNAME; 1476 if (boothowto & RB_ASKNAME) { 1477 while (1) { 1478 printf("root device"); 1479 if (bootdv != NULL) { 1480 printf(" (default %s", bootdv->dv_xname); 1481 if (bootdv->dv_class == DV_DISK) 1482 printf("%c", 'a' + part); 1483 printf(")"); 1484 } 1485 printf(": "); 1486 s = splhigh(); 1487 cnpollc(1); 1488 len = getsn(buf, sizeof(buf)); 1489 cnpollc(0); 1490 splx(s); 1491 if (strcmp(buf, "exit") == 0) 1492 reboot(exitflags); 1493 if (len == 0 && bootdv != NULL) { 1494 strlcpy(buf, bootdv->dv_xname, sizeof buf); 1495 len = strlen(buf); 1496 } 1497 if (len > 0 && buf[len - 1] == '*') { 1498 buf[--len] = '\0'; 1499 dv = getdisk(buf, len, part, &nrootdev); 1500 if (dv != NULL) { 1501 rootdv = dv; 1502 nswapdev = nrootdev; 1503 goto gotswap; 1504 } 1505 } 1506 dv = getdisk(buf, len, part, &nrootdev); 1507 if (dv != NULL) { 1508 rootdv = dv; 1509 break; 1510 } 1511 } 1512 1513 if (rootdv->dv_class == DV_IFNET) 1514 goto gotswap; 1515 1516 /* try to build swap device out of new root device */ 1517 while (1) { 1518 printf("swap device"); 1519 if (rootdv != NULL) 1520 printf(" (default %s%s)", rootdv->dv_xname, 1521 rootdv->dv_class == DV_DISK ? "b" : ""); 1522 printf(": "); 1523 s = splhigh(); 1524 cnpollc(1); 1525 len = getsn(buf, sizeof(buf)); 1526 cnpollc(0); 1527 splx(s); 1528 if (strcmp(buf, "exit") == 0) 1529 reboot(exitflags); 1530 if (len == 0 && rootdv != NULL) { 1531 switch (rootdv->dv_class) { 1532 case DV_IFNET: 1533 nswapdev = NODEV; 1534 break; 1535 case DV_DISK: 1536 nswapdev = MAKEDISKDEV(major(nrootdev), 1537 DISKUNIT(nrootdev), 1); 1538 if (nswapdev == nrootdev) 1539 continue; 1540 break; 1541 default: 1542 break; 1543 } 1544 break; 1545 } 1546 dv = getdisk(buf, len, 1, &nswapdev); 1547 if (dv) { 1548 if (dv->dv_class == DV_IFNET) 1549 nswapdev = NODEV; 1550 if (nswapdev == nrootdev) 1551 continue; 1552 break; 1553 } 1554 } 1555 gotswap: 1556 rootdev = nrootdev; 1557 dumpdev = nswapdev; 1558 swdevt[0].sw_dev = nswapdev; 1559 swdevt[1].sw_dev = NODEV; 1560 #if defined(NFSCLIENT) 1561 } else if (mountroot == nfs_mountroot) { 1562 rootdv = bootdv; 1563 rootdev = dumpdev = swapdev = NODEV; 1564 #endif 1565 } else if (mountroot == NULL && rootdev == NODEV) { 1566 /* 1567 * `swap generic' 1568 */ 1569 rootdv = bootdv; 1570 1571 if (bootdv->dv_class == DV_DISK) { 1572 if (!duid_iszero(rootduid)) { 1573 TAILQ_FOREACH(dk, &disklist, dk_link) 1574 if ((dk->dk_flags & DKF_LABELVALID) && 1575 dk->dk_label && duid_equal( 1576 dk->dk_label->d_uid, rootduid)) 1577 break; 1578 if (dk == NULL) 1579 panic("root device (%s) not found", 1580 duid_format(rootduid)); 1581 rootdv = dk->dk_device; 1582 } 1583 } 1584 1585 majdev = findblkmajor(rootdv); 1586 if (majdev >= 0) { 1587 /* 1588 * Root and swap are on the disk. 1589 * Assume swap is on partition b. 1590 */ 1591 rootdev = MAKEDISKDEV(majdev, rootdv->dv_unit, part); 1592 nswapdev = MAKEDISKDEV(majdev, rootdv->dv_unit, 1); 1593 } else { 1594 /* 1595 * Root and swap are on a net. 1596 */ 1597 nswapdev = NODEV; 1598 } 1599 dumpdev = nswapdev; 1600 swdevt[0].sw_dev = nswapdev; 1601 /* swdevt[1].sw_dev = NODEV; */ 1602 } else { 1603 /* Completely pre-configured, but we want rootdv .. */ 1604 majdev = major(rootdev); 1605 if (findblkname(majdev) == NULL) 1606 return; 1607 unit = DISKUNIT(rootdev); 1608 part = DISKPART(rootdev); 1609 snprintf(buf, sizeof buf, "%s%d%c", 1610 findblkname(majdev), unit, 'a' + part); 1611 rootdv = parsedisk(buf, strlen(buf), 0, &nrootdev); 1612 if (rootdv == NULL) 1613 panic("root device (%s) not found", buf); 1614 } 1615 1616 if (rootdv && rootdv == bootdv && rootdv->dv_class == DV_IFNET) 1617 ifp = ifunit(rootdv->dv_xname); 1618 else if (bootdv && bootdv->dv_class == DV_IFNET) 1619 ifp = ifunit(bootdv->dv_xname); 1620 1621 if (ifp) 1622 if_addgroup(ifp, "netboot"); 1623 1624 switch (rootdv->dv_class) { 1625 #if defined(NFSCLIENT) 1626 case DV_IFNET: 1627 mountroot = nfs_mountroot; 1628 nfsbootdevname = rootdv->dv_xname; 1629 return; 1630 #endif 1631 case DV_DISK: 1632 mountroot = dk_mountroot; 1633 part = DISKPART(rootdev); 1634 break; 1635 default: 1636 printf("can't figure root, hope your kernel is right\n"); 1637 return; 1638 } 1639 1640 printf("root on %s%c", rootdv->dv_xname, 'a' + part); 1641 1642 if (dk && dk->dk_device == rootdv) 1643 printf(" (%s.%c)", duid_format(rootduid), 'a' + part); 1644 1645 /* 1646 * Make the swap partition on the root drive the primary swap. 1647 */ 1648 for (swp = swdevt; swp->sw_dev != NODEV; swp++) { 1649 if (major(rootdev) == major(swp->sw_dev) && 1650 DISKUNIT(rootdev) == DISKUNIT(swp->sw_dev)) { 1651 temp = swdevt[0].sw_dev; 1652 swdevt[0].sw_dev = swp->sw_dev; 1653 swp->sw_dev = temp; 1654 break; 1655 } 1656 } 1657 if (swp->sw_dev != NODEV) { 1658 /* 1659 * If dumpdev was the same as the old primary swap device, 1660 * move it to the new primary swap device. 1661 */ 1662 if (temp == dumpdev) 1663 dumpdev = swdevt[0].sw_dev; 1664 } 1665 if (swdevt[0].sw_dev != NODEV) 1666 printf(" swap on %s%d%c", findblkname(major(swdevt[0].sw_dev)), 1667 DISKUNIT(swdevt[0].sw_dev), 1668 'a' + DISKPART(swdevt[0].sw_dev)); 1669 if (dumpdev != NODEV) 1670 printf(" dump on %s%d%c", findblkname(major(dumpdev)), 1671 DISKUNIT(dumpdev), 'a' + DISKPART(dumpdev)); 1672 printf("\n"); 1673 } 1674 1675 extern struct nam2blk nam2blk[]; 1676 1677 int 1678 findblkmajor(struct device *dv) 1679 { 1680 char buf[16], *p; 1681 int i; 1682 1683 if (strlcpy(buf, dv->dv_xname, sizeof buf) >= sizeof buf) 1684 return (-1); 1685 for (p = buf; *p; p++) 1686 if (*p >= '0' && *p <= '9') 1687 *p = '\0'; 1688 1689 for (i = 0; nam2blk[i].name; i++) 1690 if (!strcmp(buf, nam2blk[i].name)) 1691 return (nam2blk[i].maj); 1692 return (-1); 1693 } 1694 1695 char * 1696 findblkname(int maj) 1697 { 1698 int i; 1699 1700 for (i = 0; nam2blk[i].name; i++) 1701 if (nam2blk[i].maj == maj) 1702 return (nam2blk[i].name); 1703 return (NULL); 1704 } 1705 1706 char * 1707 disk_readlabel(struct disklabel *dl, dev_t dev, char *errbuf, size_t errsize) 1708 { 1709 struct vnode *vn; 1710 dev_t chrdev, rawdev; 1711 int error; 1712 1713 chrdev = blktochr(dev); 1714 rawdev = MAKEDISKDEV(major(chrdev), DISKUNIT(chrdev), RAW_PART); 1715 1716 #ifdef DEBUG 1717 printf("dev=0x%x chrdev=0x%x rawdev=0x%x\n", dev, chrdev, rawdev); 1718 #endif 1719 1720 if (cdevvp(rawdev, &vn)) { 1721 snprintf(errbuf, errsize, 1722 "cannot obtain vnode for 0x%x/0x%x", dev, rawdev); 1723 return (errbuf); 1724 } 1725 1726 error = VOP_OPEN(vn, FREAD, NOCRED, curproc); 1727 if (error) { 1728 snprintf(errbuf, errsize, 1729 "cannot open disk, 0x%x/0x%x, error %d", 1730 dev, rawdev, error); 1731 goto done; 1732 } 1733 1734 error = VOP_IOCTL(vn, DIOCGDINFO, (caddr_t)dl, FREAD, NOCRED, curproc); 1735 if (error) { 1736 snprintf(errbuf, errsize, 1737 "cannot read disk label, 0x%x/0x%x, error %d", 1738 dev, rawdev, error); 1739 } 1740 done: 1741 VOP_CLOSE(vn, FREAD, NOCRED, curproc); 1742 vput(vn); 1743 if (error) 1744 return (errbuf); 1745 return (NULL); 1746 } 1747 1748 int 1749 disk_map(char *path, char *mappath, int size, int flags) 1750 { 1751 struct disk *dk, *mdk; 1752 u_char uid[8]; 1753 char c, part; 1754 int i; 1755 1756 /* 1757 * Attempt to map a request for a disklabel UID to the correct device. 1758 * We should be supplied with a disklabel UID which has the following 1759 * format: 1760 * 1761 * [disklabel uid] . [partition] 1762 * 1763 * Alternatively, if the DM_OPENPART flag is set the disklabel UID can 1764 * based passed on its own. 1765 */ 1766 1767 if (strchr(path, '/') != NULL) 1768 return -1; 1769 1770 /* Verify that the device name is properly formed. */ 1771 if (!((strlen(path) == 16 && (flags & DM_OPENPART)) || 1772 (strlen(path) == 18 && path[16] == '.'))) 1773 return -1; 1774 1775 /* Get partition. */ 1776 if (flags & DM_OPENPART) 1777 part = 'a' + RAW_PART; 1778 else 1779 part = path[17]; 1780 1781 if (part < 'a' || part >= 'a' + MAXPARTITIONS) 1782 return -1; 1783 1784 /* Derive label UID. */ 1785 memset(uid, 0, sizeof(uid)); 1786 for (i = 0; i < 16; i++) { 1787 c = path[i]; 1788 if (c >= '0' && c <= '9') 1789 c -= '0'; 1790 else if (c >= 'a' && c <= 'f') 1791 c -= ('a' - 10); 1792 else 1793 return -1; 1794 1795 uid[i / 2] <<= 4; 1796 uid[i / 2] |= c & 0xf; 1797 } 1798 1799 mdk = NULL; 1800 TAILQ_FOREACH(dk, &disklist, dk_link) { 1801 if ((dk->dk_flags & DKF_LABELVALID) && dk->dk_label && 1802 memcmp(dk->dk_label->d_uid, uid, 1803 sizeof(dk->dk_label->d_uid)) == 0) { 1804 /* Fail if there are duplicate UIDs! */ 1805 if (mdk != NULL) 1806 return -1; 1807 mdk = dk; 1808 } 1809 } 1810 1811 if (mdk == NULL || mdk->dk_name == NULL) 1812 return -1; 1813 1814 snprintf(mappath, size, "/dev/%s%s%c", 1815 (flags & DM_OPENBLCK) ? "" : "r", mdk->dk_name, part); 1816 1817 return 0; 1818 } 1819 1820 /* 1821 * Lookup a disk device and verify that it has completed attaching. 1822 */ 1823 struct device * 1824 disk_lookup(struct cfdriver *cd, int unit) 1825 { 1826 struct device *dv; 1827 struct disk *dk; 1828 1829 dv = device_lookup(cd, unit); 1830 if (dv == NULL) 1831 return (NULL); 1832 1833 TAILQ_FOREACH(dk, &disklist, dk_link) 1834 if (dk->dk_device == dv) 1835 break; 1836 1837 if (dk == NULL) { 1838 device_unref(dv); 1839 return (NULL); 1840 } 1841 1842 return (dv); 1843 } 1844 1845 int 1846 duid_equal(u_char *duid1, u_char *duid2) 1847 { 1848 return (memcmp(duid1, duid2, DUID_SIZE) == 0); 1849 } 1850 1851 int 1852 duid_iszero(u_char *duid) 1853 { 1854 u_char zeroduid[DUID_SIZE]; 1855 1856 memset(zeroduid, 0, sizeof(zeroduid)); 1857 1858 return (duid_equal(duid, zeroduid)); 1859 } 1860 1861 const char * 1862 duid_format(u_char *duid) 1863 { 1864 static char duid_str[17]; 1865 1866 snprintf(duid_str, sizeof(duid_str), 1867 "%02x%02x%02x%02x%02x%02x%02x%02x", 1868 duid[0], duid[1], duid[2], duid[3], 1869 duid[4], duid[5], duid[6], duid[7]); 1870 1871 return (duid_str); 1872 } 1873