1 /* 2 * Copyright (c) 1980, 1986 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)setup.c 5.33 (Berkeley) 02/22/91"; 10 #endif /* not lint */ 11 12 #define DKTYPENAMES 13 #include <sys/param.h> 14 #include <ufs/dinode.h> 15 #include <ufs/fs.h> 16 #include <sys/stat.h> 17 #include <sys/ioctl.h> 18 #include <sys/disklabel.h> 19 #include <sys/file.h> 20 #include <errno.h> 21 #include <stdlib.h> 22 #include <string.h> 23 #include <ctype.h> 24 #include "fsck.h" 25 26 struct bufarea asblk; 27 #define altsblock (*asblk.b_un.b_fs) 28 #define POWEROF2(num) (((num) & ((num) - 1)) == 0) 29 30 /* 31 * The size of a cylinder group is calculated by CGSIZE. The maximum size 32 * is limited by the fact that cylinder groups are at most one block. 33 * Its size is derived from the size of the maps maintained in the 34 * cylinder group and the (struct cg) size. 35 */ 36 #define CGSIZE(fs) \ 37 /* base cg */ (sizeof(struct cg) + \ 38 /* blktot size */ (fs)->fs_cpg * sizeof(long) + \ 39 /* blks size */ (fs)->fs_cpg * (fs)->fs_nrpos * sizeof(short) + \ 40 /* inode map */ howmany((fs)->fs_ipg, NBBY) + \ 41 /* block map */ howmany((fs)->fs_cpg * (fs)->fs_spc / NSPF(fs), NBBY)) 42 43 char *index(); 44 struct disklabel *getdisklabel(); 45 46 setup(dev) 47 char *dev; 48 { 49 long cg, size, asked, i, j; 50 long bmapsize; 51 struct disklabel *lp; 52 struct stat statb; 53 struct fs proto; 54 55 havesb = 0; 56 if (stat(dev, &statb) < 0) { 57 printf("Can't stat %s: %s\n", dev, strerror(errno)); 58 return (0); 59 } 60 if ((statb.st_mode & S_IFMT) != S_IFCHR) { 61 pfatal("%s is not a character device", dev); 62 if (reply("CONTINUE") == 0) 63 return (0); 64 } 65 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 66 printf("Can't open %s: %s\n", dev, strerror(errno)); 67 return (0); 68 } 69 if (preen == 0) 70 printf("** %s", dev); 71 if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) { 72 fswritefd = -1; 73 if (preen) 74 pfatal("NO WRITE ACCESS"); 75 printf(" (NO WRITE)"); 76 } 77 if (preen == 0) 78 printf("\n"); 79 fsmodified = 0; 80 lfdir = 0; 81 initbarea(&sblk); 82 initbarea(&asblk); 83 sblk.b_un.b_buf = malloc(SBSIZE); 84 asblk.b_un.b_buf = malloc(SBSIZE); 85 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 86 errexit("cannot allocate space for superblock\n"); 87 if (lp = getdisklabel((char *)NULL, fsreadfd)) 88 dev_bsize = secsize = lp->d_secsize; 89 else 90 dev_bsize = secsize = DEV_BSIZE; 91 #ifdef tahoe 92 /* 93 * On the tahoe, the disk label and the disk driver disagree. 94 * The label knows that sectors are 512 bytes, but the disk 95 * drivers will only transfer in 1024 sized pieces. 96 */ 97 secsize = 1024; 98 #endif 99 /* 100 * Read in the superblock, looking for alternates if necessary 101 */ 102 if (readsb(1) == 0) { 103 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 104 return(0); 105 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 106 return (0); 107 for (cg = 0; cg < proto.fs_ncg; cg++) { 108 bflag = fsbtodb(&proto, cgsblock(&proto, cg)); 109 if (readsb(0) != 0) 110 break; 111 } 112 if (cg >= proto.fs_ncg) { 113 printf("%s %s\n%s %s\n%s %s\n", 114 "SEARCH FOR ALTERNATE SUPER-BLOCK", 115 "FAILED. YOU MUST USE THE", 116 "-b OPTION TO FSCK TO SPECIFY THE", 117 "LOCATION OF AN ALTERNATE", 118 "SUPER-BLOCK TO SUPPLY NEEDED", 119 "INFORMATION; SEE fsck(8)."); 120 return(0); 121 } 122 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 123 } 124 maxfsblock = sblock.fs_size; 125 maxino = sblock.fs_ncg * sblock.fs_ipg; 126 /* 127 * Check and potentially fix certain fields in the super block. 128 */ 129 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) { 130 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 131 if (reply("SET TO DEFAULT") == 1) { 132 sblock.fs_optim = FS_OPTTIME; 133 sbdirty(); 134 } 135 } 136 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) { 137 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 138 sblock.fs_minfree); 139 if (reply("SET TO DEFAULT") == 1) { 140 sblock.fs_minfree = 10; 141 sbdirty(); 142 } 143 } 144 if (sblock.fs_interleave < 1 || 145 sblock.fs_interleave > sblock.fs_nsect) { 146 pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK", 147 sblock.fs_interleave); 148 sblock.fs_interleave = 1; 149 if (preen) 150 printf(" (FIXED)\n"); 151 if (preen || reply("SET TO DEFAULT") == 1) { 152 sbdirty(); 153 dirty(&asblk); 154 } 155 } 156 if (sblock.fs_npsect < sblock.fs_nsect || 157 sblock.fs_npsect > sblock.fs_nsect*2) { 158 pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", 159 sblock.fs_npsect); 160 sblock.fs_npsect = sblock.fs_nsect; 161 if (preen) 162 printf(" (FIXED)\n"); 163 if (preen || reply("SET TO DEFAULT") == 1) { 164 sbdirty(); 165 dirty(&asblk); 166 } 167 } 168 if (cvtflag) { 169 if (sblock.fs_postblformat == FS_42POSTBLFMT) { 170 /* 171 * Requested to convert from old format to new format 172 */ 173 if (preen) 174 pwarn("CONVERTING TO NEW FILE SYSTEM FORMAT\n"); 175 else if (!reply("CONVERT TO NEW FILE SYSTEM FORMAT")) 176 return(0); 177 sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT; 178 sblock.fs_nrpos = 8; 179 sblock.fs_postbloff = 180 (char *)(&sblock.fs_opostbl[0][0]) - 181 (char *)(&sblock.fs_link); 182 sblock.fs_rotbloff = &sblock.fs_space[0] - 183 (u_char *)(&sblock.fs_link); 184 sblock.fs_cgsize = 185 fragroundup(&sblock, CGSIZE(&sblock)); 186 /* 187 * Planning now for future expansion. 188 */ 189 # if (BYTE_ORDER == BIG_ENDIAN) 190 sblock.fs_qbmask.val[0] = 0; 191 sblock.fs_qbmask.val[1] = ~sblock.fs_bmask; 192 sblock.fs_qfmask.val[0] = 0; 193 sblock.fs_qfmask.val[1] = ~sblock.fs_fmask; 194 # endif /* BIG_ENDIAN */ 195 # if (BYTE_ORDER == LITTLE_ENDIAN) 196 sblock.fs_qbmask.val[0] = ~sblock.fs_bmask; 197 sblock.fs_qbmask.val[1] = 0; 198 sblock.fs_qfmask.val[0] = ~sblock.fs_fmask; 199 sblock.fs_qfmask.val[1] = 0; 200 # endif /* LITTLE_ENDIAN */ 201 sbdirty(); 202 dirty(&asblk); 203 } else if (sblock.fs_postblformat == FS_DYNAMICPOSTBLFMT) { 204 /* 205 * Requested to convert from new format to old format 206 */ 207 if (sblock.fs_nrpos != 8 || sblock.fs_ipg > 2048 || 208 sblock.fs_cpg > 32 || sblock.fs_cpc > 16) { 209 printf( 210 "PARAMETERS OF CURRENT FILE SYSTEM DO NOT\n\t"); 211 errexit( 212 "ALLOW CONVERSION TO OLD FILE SYSTEM FORMAT\n"); 213 } 214 if (preen) 215 pwarn("CONVERTING TO OLD FILE SYSTEM FORMAT\n"); 216 else if (!reply("CONVERT TO OLD FILE SYSTEM FORMAT")) 217 return(0); 218 sblock.fs_postblformat = FS_42POSTBLFMT; 219 sblock.fs_cgsize = fragroundup(&sblock, 220 sizeof(struct ocg) + howmany(sblock.fs_fpg, NBBY)); 221 sbdirty(); 222 dirty(&asblk); 223 } else { 224 errexit("UNKNOWN FILE SYSTEM FORMAT\n"); 225 } 226 } 227 if (asblk.b_dirty) { 228 bcopy((char *)&sblock, (char *)&altsblock, 229 (size_t)sblock.fs_sbsize); 230 flush(fswritefd, &asblk); 231 } 232 /* 233 * read in the summary info. 234 */ 235 asked = 0; 236 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 237 size = sblock.fs_cssize - i < sblock.fs_bsize ? 238 sblock.fs_cssize - i : sblock.fs_bsize; 239 sblock.fs_csp[j] = (struct csum *)calloc(1, (unsigned)size); 240 if (bread(fsreadfd, (char *)sblock.fs_csp[j], 241 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 242 size) != 0 && !asked) { 243 pfatal("BAD SUMMARY INFORMATION"); 244 if (reply("CONTINUE") == 0) 245 errexit(""); 246 asked++; 247 } 248 } 249 /* 250 * allocate and initialize the necessary maps 251 */ 252 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(short)); 253 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 254 if (blockmap == NULL) { 255 printf("cannot alloc %u bytes for blockmap\n", 256 (unsigned)bmapsize); 257 goto badsb; 258 } 259 statemap = calloc((unsigned)(maxino + 1), sizeof(char)); 260 if (statemap == NULL) { 261 printf("cannot alloc %u bytes for statemap\n", 262 (unsigned)(maxino + 1)); 263 goto badsb; 264 } 265 lncntp = (short *)calloc((unsigned)(maxino + 1), sizeof(short)); 266 if (lncntp == NULL) { 267 printf("cannot alloc %u bytes for lncntp\n", 268 (unsigned)(maxino + 1) * sizeof(short)); 269 goto badsb; 270 } 271 numdirs = sblock.fs_cstotal.cs_ndir; 272 inplast = 0; 273 listmax = numdirs + 10; 274 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 275 sizeof(struct inoinfo *)); 276 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 277 sizeof(struct inoinfo *)); 278 if (inpsort == NULL || inphead == NULL) { 279 printf("cannot alloc %u bytes for inphead\n", 280 (unsigned)numdirs * sizeof(struct inoinfo *)); 281 goto badsb; 282 } 283 bufinit(); 284 return (1); 285 286 badsb: 287 ckfini(); 288 return (0); 289 } 290 291 /* 292 * Read in the super block and its summary info. 293 */ 294 readsb(listerr) 295 int listerr; 296 { 297 daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 298 299 if (bread(fsreadfd, (char *)&sblock, super, (long)SBSIZE) != 0) 300 return (0); 301 sblk.b_bno = super; 302 sblk.b_size = SBSIZE; 303 /* 304 * run a few consistency checks of the super block 305 */ 306 if (sblock.fs_magic != FS_MAGIC) 307 { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); } 308 if (sblock.fs_ncg < 1) 309 { badsb(listerr, "NCG OUT OF RANGE"); return (0); } 310 if (sblock.fs_cpg < 1) 311 { badsb(listerr, "CPG OUT OF RANGE"); return (0); } 312 if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl || 313 (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl) 314 { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); } 315 if (sblock.fs_sbsize > SBSIZE) 316 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } 317 /* 318 * Compute block size that the filesystem is based on, 319 * according to fsbtodb, and adjust superblock block number 320 * so we can tell if this is an alternate later. 321 */ 322 super *= dev_bsize; 323 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1); 324 sblk.b_bno = super / dev_bsize; 325 /* 326 * Set all possible fields that could differ, then do check 327 * of whole super block against an alternate super block. 328 * When an alternate super-block is specified this check is skipped. 329 */ 330 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); 331 if (asblk.b_errs) 332 return (0); 333 if (bflag) { 334 havesb = 1; 335 return (1); 336 } 337 altsblock.fs_link = sblock.fs_link; 338 altsblock.fs_rlink = sblock.fs_rlink; 339 altsblock.fs_time = sblock.fs_time; 340 altsblock.fs_cstotal = sblock.fs_cstotal; 341 altsblock.fs_cgrotor = sblock.fs_cgrotor; 342 altsblock.fs_fmod = sblock.fs_fmod; 343 altsblock.fs_clean = sblock.fs_clean; 344 altsblock.fs_ronly = sblock.fs_ronly; 345 altsblock.fs_flags = sblock.fs_flags; 346 altsblock.fs_maxcontig = sblock.fs_maxcontig; 347 altsblock.fs_minfree = sblock.fs_minfree; 348 altsblock.fs_optim = sblock.fs_optim; 349 altsblock.fs_rotdelay = sblock.fs_rotdelay; 350 altsblock.fs_maxbpg = sblock.fs_maxbpg; 351 bcopy((char *)sblock.fs_csp, (char *)altsblock.fs_csp, 352 sizeof sblock.fs_csp); 353 bcopy((char *)sblock.fs_fsmnt, (char *)altsblock.fs_fsmnt, 354 sizeof sblock.fs_fsmnt); 355 bcopy((char *)sblock.fs_sparecon, (char *)altsblock.fs_sparecon, 356 sizeof sblock.fs_sparecon); 357 /* 358 * The following should not have to be copied. 359 */ 360 altsblock.fs_fsbtodb = sblock.fs_fsbtodb; 361 altsblock.fs_interleave = sblock.fs_interleave; 362 altsblock.fs_npsect = sblock.fs_npsect; 363 altsblock.fs_nrpos = sblock.fs_nrpos; 364 if (bcmp((char *)&sblock, (char *)&altsblock, (int)sblock.fs_sbsize)) { 365 badsb(listerr, 366 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 367 return (0); 368 } 369 havesb = 1; 370 return (1); 371 } 372 373 badsb(listerr, s) 374 int listerr; 375 char *s; 376 { 377 378 if (!listerr) 379 return; 380 if (preen) 381 printf("%s: ", devname); 382 pfatal("BAD SUPER BLOCK: %s\n", s); 383 } 384 385 /* 386 * Calculate a prototype superblock based on information in the disk label. 387 * When done the cgsblock macro can be calculated and the fs_ncg field 388 * can be used. Do NOT attempt to use other macros without verifying that 389 * their needed information is available! 390 */ 391 calcsb(dev, devfd, fs) 392 char *dev; 393 int devfd; 394 register struct fs *fs; 395 { 396 register struct disklabel *lp; 397 register struct partition *pp; 398 register char *cp; 399 int i; 400 401 cp = index(dev, '\0') - 1; 402 if (cp == (char *)-1 || (*cp < 'a' || *cp > 'h') && !isdigit(*cp)) { 403 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 404 return (0); 405 } 406 lp = getdisklabel(dev, devfd); 407 if (isdigit(*cp)) 408 pp = &lp->d_partitions[0]; 409 else 410 pp = &lp->d_partitions[*cp - 'a']; 411 if (pp->p_fstype != FS_BSDFFS) { 412 pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n", 413 dev, pp->p_fstype < FSMAXTYPES ? 414 fstypenames[pp->p_fstype] : "unknown"); 415 return (0); 416 } 417 bzero((char *)fs, sizeof(struct fs)); 418 fs->fs_fsize = pp->p_fsize; 419 fs->fs_frag = pp->p_frag; 420 fs->fs_cpg = pp->p_cpg; 421 fs->fs_size = pp->p_size; 422 fs->fs_ntrak = lp->d_ntracks; 423 fs->fs_nsect = lp->d_nsectors; 424 fs->fs_spc = lp->d_secpercyl; 425 fs->fs_nspf = fs->fs_fsize / lp->d_secsize; 426 fs->fs_sblkno = roundup( 427 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 428 fs->fs_frag); 429 fs->fs_cgmask = 0xffffffff; 430 for (i = fs->fs_ntrak; i > 1; i >>= 1) 431 fs->fs_cgmask <<= 1; 432 if (!POWEROF2(fs->fs_ntrak)) 433 fs->fs_cgmask <<= 1; 434 fs->fs_cgoffset = roundup( 435 howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag); 436 fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs); 437 fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg); 438 for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1) 439 fs->fs_fsbtodb++; 440 dev_bsize = lp->d_secsize; 441 return (1); 442 } 443 444 struct disklabel * 445 getdisklabel(s, fd) 446 char *s; 447 int fd; 448 { 449 static struct disklabel lab; 450 451 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 452 if (s == NULL) 453 return ((struct disklabel *)NULL); 454 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 455 errexit("%s: can't read disk label\n", s); 456 } 457 return (&lab); 458 } 459