1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if 0 33 #ifndef lint 34 static const char sccsid[] = "@(#)setup.c 8.10 (Berkeley) 5/9/95"; 35 #endif /* not lint */ 36 #endif 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/param.h> 41 #include <sys/disk.h> 42 #include <sys/stat.h> 43 #define FSTYPENAMES 44 #include <sys/disklabel.h> 45 #include <sys/file.h> 46 #include <sys/sysctl.h> 47 48 #include <ufs/ufs/dinode.h> 49 #include <ufs/ffs/fs.h> 50 51 #include <ctype.h> 52 #include <err.h> 53 #include <errno.h> 54 #include <limits.h> 55 #include <stdint.h> 56 #include <string.h> 57 #include <libufs.h> 58 59 #include "fsck.h" 60 61 struct uufsd disk; 62 struct bufarea asblk; 63 #define altsblock (*asblk.b_un.b_fs) 64 #define POWEROF2(num) (((num) & ((num) - 1)) == 0) 65 66 static int calcsb(char *dev, int devfd, struct fs *fs); 67 static void saverecovery(int readfd, int writefd); 68 static int chkrecovery(int devfd); 69 70 /* 71 * Read in a superblock finding an alternate if necessary. 72 * Return 1 if successful, 0 if unsuccessful, -1 if file system 73 * is already clean (ckclean and preen mode only). 74 */ 75 int 76 setup(char *dev) 77 { 78 long cg, asked, i, j; 79 long bmapsize; 80 struct stat statb; 81 struct fs proto; 82 size_t size; 83 84 havesb = 0; 85 fswritefd = -1; 86 cursnapshot = 0; 87 if (stat(dev, &statb) < 0) { 88 printf("Can't stat %s: %s\n", dev, strerror(errno)); 89 if (bkgrdflag) { 90 unlink(snapname); 91 bkgrdflag = 0; 92 } 93 return (0); 94 } 95 if ((statb.st_mode & S_IFMT) != S_IFCHR && 96 (statb.st_mode & S_IFMT) != S_IFBLK) { 97 if (bkgrdflag != 0 && (statb.st_flags & SF_SNAPSHOT) == 0) { 98 unlink(snapname); 99 printf("background fsck lacks a snapshot\n"); 100 exit(EEXIT); 101 } 102 if ((statb.st_flags & SF_SNAPSHOT) != 0 && cvtlevel == 0) { 103 cursnapshot = statb.st_ino; 104 } else { 105 if (cvtlevel == 0 || 106 (statb.st_flags & SF_SNAPSHOT) == 0) { 107 if (preen && bkgrdflag) { 108 unlink(snapname); 109 bkgrdflag = 0; 110 } 111 pfatal("%s is not a disk device", dev); 112 if (reply("CONTINUE") == 0) { 113 if (bkgrdflag) { 114 unlink(snapname); 115 bkgrdflag = 0; 116 } 117 return (0); 118 } 119 } else { 120 if (bkgrdflag) { 121 unlink(snapname); 122 bkgrdflag = 0; 123 } 124 pfatal("cannot convert a snapshot"); 125 exit(EEXIT); 126 } 127 } 128 } 129 if ((fsreadfd = open(dev, O_RDONLY)) < 0 || 130 ufs_disk_fillout_blank(&disk, dev) < 0) { 131 if (bkgrdflag) { 132 unlink(snapname); 133 bkgrdflag = 0; 134 } 135 printf("Can't open %s: %s\n", dev, strerror(errno)); 136 return (0); 137 } 138 if (bkgrdflag) { 139 unlink(snapname); 140 size = MIBSIZE; 141 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0|| 142 sysctlnametomib("vfs.ffs.adjblkcnt", adjblkcnt, &size) < 0|| 143 sysctlnametomib("vfs.ffs.freefiles", freefiles, &size) < 0|| 144 sysctlnametomib("vfs.ffs.freedirs", freedirs, &size) < 0 || 145 sysctlnametomib("vfs.ffs.freeblks", freeblks, &size) < 0) { 146 pfatal("kernel lacks background fsck support\n"); 147 exit(EEXIT); 148 } 149 /* 150 * When kernel is lack of runtime bgfsck superblock summary 151 * adjustment functionality, it does not mean we can not 152 * continue, as old kernels will recompute the summary at 153 * mount time. However, it will be an unexpected softupdates 154 * inconsistency if it turns out that the summary is still 155 * incorrect. Set a flag so subsequent operation can know 156 * this. 157 */ 158 bkgrdsumadj = 1; 159 if (sysctlnametomib("vfs.ffs.adjndir", adjndir, &size) < 0 || 160 sysctlnametomib("vfs.ffs.adjnbfree", adjnbfree, &size) < 0 || 161 sysctlnametomib("vfs.ffs.adjnifree", adjnifree, &size) < 0 || 162 sysctlnametomib("vfs.ffs.adjnffree", adjnffree, &size) < 0 || 163 sysctlnametomib("vfs.ffs.adjnumclusters", adjnumclusters, &size) < 0) { 164 bkgrdsumadj = 0; 165 pwarn("kernel lacks runtime superblock summary adjustment support"); 166 } 167 cmd.version = FFS_CMD_VERSION; 168 cmd.handle = fsreadfd; 169 fswritefd = -1; 170 } 171 if (preen == 0) 172 printf("** %s", dev); 173 if (bkgrdflag == 0 && 174 (nflag || ufs_disk_write(&disk) < 0 || 175 (fswritefd = dup(disk.d_fd)) < 0)) { 176 fswritefd = -1; 177 if (preen) 178 pfatal("NO WRITE ACCESS"); 179 printf(" (NO WRITE)"); 180 } 181 if (preen == 0) 182 printf("\n"); 183 /* 184 * Read in the superblock, looking for alternates if necessary 185 */ 186 if (readsb(1) == 0) { 187 skipclean = 0; 188 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 189 return(0); 190 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 191 return (0); 192 for (cg = 0; cg < proto.fs_ncg; cg++) { 193 bflag = fsbtodb(&proto, cgsblock(&proto, cg)); 194 if (readsb(0) != 0) 195 break; 196 } 197 if (cg >= proto.fs_ncg) { 198 printf("%s %s\n%s %s\n%s %s\n", 199 "SEARCH FOR ALTERNATE SUPER-BLOCK", 200 "FAILED. YOU MUST USE THE", 201 "-b OPTION TO FSCK TO SPECIFY THE", 202 "LOCATION OF AN ALTERNATE", 203 "SUPER-BLOCK TO SUPPLY NEEDED", 204 "INFORMATION; SEE fsck_ffs(8)."); 205 bflag = 0; 206 return(0); 207 } 208 pwarn("USING ALTERNATE SUPERBLOCK AT %jd\n", bflag); 209 bflag = 0; 210 } 211 /* Save copy of things needed by libufs */ 212 memcpy(&disk.d_fs, &sblock, sblock.fs_sbsize); 213 disk.d_ufs = (sblock.fs_magic == FS_UFS1_MAGIC) ? 1 : 2; 214 disk.d_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1); 215 disk.d_sblock = sblock.fs_sblockloc / disk.d_bsize; 216 disk.d_sbcsum = sblock.fs_csp; 217 218 if (skipclean && ckclean && sblock.fs_clean) { 219 pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n"); 220 return (-1); 221 } 222 maxfsblock = sblock.fs_size; 223 maxino = sblock.fs_ncg * sblock.fs_ipg; 224 /* 225 * Check and potentially fix certain fields in the super block. 226 */ 227 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) { 228 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 229 if (reply("SET TO DEFAULT") == 1) { 230 sblock.fs_optim = FS_OPTTIME; 231 sbdirty(); 232 } 233 } 234 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) { 235 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 236 sblock.fs_minfree); 237 if (reply("SET TO DEFAULT") == 1) { 238 sblock.fs_minfree = 10; 239 sbdirty(); 240 } 241 } 242 if (sblock.fs_magic == FS_UFS1_MAGIC && 243 sblock.fs_old_inodefmt < FS_44INODEFMT) { 244 pwarn("Format of file system is too old.\n"); 245 pwarn("Must update to modern format using a version of fsck\n"); 246 pfatal("from before 2002 with the command ``fsck -c 2''\n"); 247 exit(EEXIT); 248 } 249 if (asblk.b_dirty && !bflag) { 250 memmove(&altsblock, &sblock, (size_t)sblock.fs_sbsize); 251 flush(fswritefd, &asblk); 252 } 253 if (preen == 0 && yflag == 0 && sblock.fs_magic == FS_UFS2_MAGIC && 254 fswritefd != -1 && chkrecovery(fsreadfd) == 0 && 255 reply("SAVE DATA TO FIND ALTERNATE SUPERBLOCKS") != 0) 256 saverecovery(fsreadfd, fswritefd); 257 /* 258 * read in the summary info. 259 */ 260 asked = 0; 261 sblock.fs_csp = Calloc(1, sblock.fs_cssize); 262 if (sblock.fs_csp == NULL) { 263 printf("cannot alloc %u bytes for cg summary info\n", 264 (unsigned)sblock.fs_cssize); 265 goto badsb; 266 } 267 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 268 size = MIN(sblock.fs_cssize - i, sblock.fs_bsize); 269 readcnt[sblk.b_type]++; 270 if (blread(fsreadfd, (char *)sblock.fs_csp + i, 271 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 272 size) != 0 && !asked) { 273 pfatal("BAD SUMMARY INFORMATION"); 274 if (reply("CONTINUE") == 0) { 275 ckfini(0); 276 exit(EEXIT); 277 } 278 asked++; 279 } 280 } 281 /* 282 * allocate and initialize the necessary maps 283 */ 284 bmapsize = roundup(howmany(maxfsblock, CHAR_BIT), sizeof(short)); 285 blockmap = Calloc((unsigned)bmapsize, sizeof (char)); 286 if (blockmap == NULL) { 287 printf("cannot alloc %u bytes for blockmap\n", 288 (unsigned)bmapsize); 289 goto badsb; 290 } 291 inostathead = Calloc(sblock.fs_ncg, sizeof(struct inostatlist)); 292 if (inostathead == NULL) { 293 printf("cannot alloc %u bytes for inostathead\n", 294 (unsigned)(sizeof(struct inostatlist) * (sblock.fs_ncg))); 295 goto badsb; 296 } 297 numdirs = MAX(sblock.fs_cstotal.cs_ndir, 128); 298 dirhash = numdirs; 299 inplast = 0; 300 listmax = numdirs + 10; 301 inpsort = (struct inoinfo **)Calloc(listmax, sizeof(struct inoinfo *)); 302 inphead = (struct inoinfo **)Calloc(numdirs, sizeof(struct inoinfo *)); 303 if (inpsort == NULL || inphead == NULL) { 304 printf("cannot alloc %ju bytes for inphead\n", 305 (uintmax_t)numdirs * sizeof(struct inoinfo *)); 306 goto badsb; 307 } 308 bufinit(); 309 if (sblock.fs_flags & FS_DOSOFTDEP) 310 usedsoftdep = 1; 311 else 312 usedsoftdep = 0; 313 return (1); 314 315 badsb: 316 ckfini(0); 317 return (0); 318 } 319 320 /* 321 * Read in the super block and its summary info. 322 */ 323 int 324 readsb(int listerr) 325 { 326 off_t super; 327 int bad, ret; 328 struct fs *fs; 329 330 super = bflag ? bflag * dev_bsize : STDSB; 331 readcnt[sblk.b_type]++; 332 if ((ret = sbget(fsreadfd, &fs, super)) != 0) { 333 switch (ret) { 334 case EINVAL: 335 /* Superblock check-hash failed */ 336 return (0); 337 case ENOENT: 338 if (bflag) 339 fprintf(stderr, "%jd is not a file system " 340 "superblock\n", super / dev_bsize); 341 else 342 fprintf(stderr, "Cannot find file system " 343 "superblock\n"); 344 return (0); 345 case EIO: 346 default: 347 fprintf(stderr, "I/O error reading %jd\n", 348 super / dev_bsize); 349 return (0); 350 } 351 } 352 memcpy(&sblock, fs, fs->fs_sbsize); 353 free(fs); 354 /* 355 * Compute block size that the file system is based on, 356 * according to fsbtodb, and adjust superblock block number 357 * so we can tell if this is an alternate later. 358 */ 359 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1); 360 sblk.b_bno = sblock.fs_sblockactualloc / dev_bsize; 361 sblk.b_size = SBLOCKSIZE; 362 /* 363 * Compare all fields that should not differ in alternate super block. 364 * When an alternate super-block is specified this check is skipped. 365 */ 366 if (bflag) 367 goto out; 368 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); 369 if (asblk.b_errs) 370 return (0); 371 bad = 0; 372 #define CHK(x, y) \ 373 if (altsblock.x != sblock.x) { \ 374 bad++; \ 375 if (listerr && debug) \ 376 printf("SUPER BLOCK VS ALTERNATE MISMATCH %s: " y " vs " y "\n", \ 377 #x, (intmax_t)sblock.x, (intmax_t)altsblock.x); \ 378 } 379 CHK(fs_sblkno, "%jd"); 380 CHK(fs_cblkno, "%jd"); 381 CHK(fs_iblkno, "%jd"); 382 CHK(fs_dblkno, "%jd"); 383 CHK(fs_ncg, "%jd"); 384 CHK(fs_bsize, "%jd"); 385 CHK(fs_fsize, "%jd"); 386 CHK(fs_frag, "%jd"); 387 CHK(fs_bmask, "%#jx"); 388 CHK(fs_fmask, "%#jx"); 389 CHK(fs_bshift, "%jd"); 390 CHK(fs_fshift, "%jd"); 391 CHK(fs_fragshift, "%jd"); 392 CHK(fs_fsbtodb, "%jd"); 393 CHK(fs_sbsize, "%jd"); 394 CHK(fs_nindir, "%jd"); 395 CHK(fs_inopb, "%jd"); 396 CHK(fs_cssize, "%jd"); 397 CHK(fs_ipg, "%jd"); 398 CHK(fs_fpg, "%jd"); 399 CHK(fs_magic, "%#jx"); 400 #undef CHK 401 if (bad) { 402 if (listerr == 0) 403 return (0); 404 if (preen) 405 printf("%s: ", cdevname); 406 printf( 407 "VALUES IN SUPER BLOCK LSB=%jd DISAGREE WITH THOSE IN\n" 408 "LAST ALTERNATE LSB=%jd\n", 409 sblk.b_bno, asblk.b_bno); 410 if (reply("IGNORE ALTERNATE SUPER BLOCK") == 0) 411 return (0); 412 } 413 out: 414 /* 415 * If not yet done, update UFS1 superblock with new wider fields. 416 */ 417 if (sblock.fs_magic == FS_UFS1_MAGIC && 418 sblock.fs_maxbsize != sblock.fs_bsize) { 419 sblock.fs_maxbsize = sblock.fs_bsize; 420 sblock.fs_time = sblock.fs_old_time; 421 sblock.fs_size = sblock.fs_old_size; 422 sblock.fs_dsize = sblock.fs_old_dsize; 423 sblock.fs_csaddr = sblock.fs_old_csaddr; 424 sblock.fs_cstotal.cs_ndir = sblock.fs_old_cstotal.cs_ndir; 425 sblock.fs_cstotal.cs_nbfree = sblock.fs_old_cstotal.cs_nbfree; 426 sblock.fs_cstotal.cs_nifree = sblock.fs_old_cstotal.cs_nifree; 427 sblock.fs_cstotal.cs_nffree = sblock.fs_old_cstotal.cs_nffree; 428 } 429 havesb = 1; 430 return (1); 431 } 432 433 void 434 sblock_init(void) 435 { 436 437 fswritefd = -1; 438 fsmodified = 0; 439 lfdir = 0; 440 initbarea(&sblk, BT_SUPERBLK); 441 initbarea(&asblk, BT_SUPERBLK); 442 sblk.b_un.b_buf = Malloc(SBLOCKSIZE); 443 asblk.b_un.b_buf = Malloc(SBLOCKSIZE); 444 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 445 errx(EEXIT, "cannot allocate space for superblock"); 446 dev_bsize = secsize = DEV_BSIZE; 447 } 448 449 /* 450 * Calculate a prototype superblock based on information in the boot area. 451 * When done the cgsblock macro can be calculated and the fs_ncg field 452 * can be used. Do NOT attempt to use other macros without verifying that 453 * their needed information is available! 454 */ 455 static int 456 calcsb(char *dev, int devfd, struct fs *fs) 457 { 458 struct fsrecovery *fsr; 459 char *fsrbuf; 460 u_int secsize; 461 462 /* 463 * We need fragments-per-group and the partition-size. 464 * 465 * Newfs stores these details at the end of the boot block area 466 * at the start of the filesystem partition. If they have been 467 * overwritten by a boot block, we fail. But usually they are 468 * there and we can use them. 469 */ 470 if (ioctl(devfd, DIOCGSECTORSIZE, &secsize) == -1) 471 return (0); 472 fsrbuf = Malloc(secsize); 473 if (fsrbuf == NULL) 474 errx(EEXIT, "calcsb: cannot allocate recovery buffer"); 475 if (blread(devfd, fsrbuf, 476 (SBLOCK_UFS2 - secsize) / dev_bsize, secsize) != 0) 477 return (0); 478 fsr = (struct fsrecovery *)&fsrbuf[secsize - sizeof *fsr]; 479 if (fsr->fsr_magic != FS_UFS2_MAGIC) 480 return (0); 481 memset(fs, 0, sizeof(struct fs)); 482 fs->fs_fpg = fsr->fsr_fpg; 483 fs->fs_fsbtodb = fsr->fsr_fsbtodb; 484 fs->fs_sblkno = fsr->fsr_sblkno; 485 fs->fs_magic = fsr->fsr_magic; 486 fs->fs_ncg = fsr->fsr_ncg; 487 free(fsrbuf); 488 return (1); 489 } 490 491 /* 492 * Check to see if recovery information exists. 493 * Return 1 if it exists or cannot be created. 494 * Return 0 if it does not exist and can be created. 495 */ 496 static int 497 chkrecovery(int devfd) 498 { 499 struct fsrecovery *fsr; 500 char *fsrbuf; 501 u_int secsize; 502 503 /* 504 * Could not determine if backup material exists, so do not 505 * offer to create it. 506 */ 507 if (ioctl(devfd, DIOCGSECTORSIZE, &secsize) == -1 || 508 (fsrbuf = Malloc(secsize)) == NULL || 509 blread(devfd, fsrbuf, (SBLOCK_UFS2 - secsize) / dev_bsize, 510 secsize) != 0) 511 return (1); 512 /* 513 * Recovery material has already been created, so do not 514 * need to create it again. 515 */ 516 fsr = (struct fsrecovery *)&fsrbuf[secsize - sizeof *fsr]; 517 if (fsr->fsr_magic == FS_UFS2_MAGIC) { 518 free(fsrbuf); 519 return (1); 520 } 521 /* 522 * Recovery material has not been created and can be if desired. 523 */ 524 free(fsrbuf); 525 return (0); 526 } 527 528 /* 529 * Read the last sector of the boot block, replace the last 530 * 20 bytes with the recovery information, then write it back. 531 * The recovery information only works for UFS2 filesystems. 532 */ 533 static void 534 saverecovery(int readfd, int writefd) 535 { 536 struct fsrecovery *fsr; 537 char *fsrbuf; 538 u_int secsize; 539 540 if (sblock.fs_magic != FS_UFS2_MAGIC || 541 ioctl(readfd, DIOCGSECTORSIZE, &secsize) == -1 || 542 (fsrbuf = Malloc(secsize)) == NULL || 543 blread(readfd, fsrbuf, (SBLOCK_UFS2 - secsize) / dev_bsize, 544 secsize) != 0) { 545 printf("RECOVERY DATA COULD NOT BE CREATED\n"); 546 return; 547 } 548 fsr = (struct fsrecovery *)&fsrbuf[secsize - sizeof *fsr]; 549 fsr->fsr_magic = sblock.fs_magic; 550 fsr->fsr_fpg = sblock.fs_fpg; 551 fsr->fsr_fsbtodb = sblock.fs_fsbtodb; 552 fsr->fsr_sblkno = sblock.fs_sblkno; 553 fsr->fsr_ncg = sblock.fs_ncg; 554 blwrite(writefd, fsrbuf, (SBLOCK_UFS2 - secsize) / secsize, secsize); 555 free(fsrbuf); 556 } 557