1 /* 2 * Copyright (c) 1980 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 */ 6 7 #ifndef lint 8 static char sccsid[] = "@(#)setup.c 5.17 (Berkeley) 05/01/88"; 9 #endif not lint 10 11 #define DKTYPENAMES 12 #include <sys/param.h> 13 #include <sys/inode.h> 14 #include <sys/fs.h> 15 #include <sys/stat.h> 16 #include <sys/ioctl.h> 17 #include <sys/disklabel.h> 18 #include <sys/file.h> 19 #include <machine/endian.h> 20 #include <ctype.h> 21 #include "fsck.h" 22 23 BUFAREA asblk; 24 #define altsblock asblk.b_un.b_fs 25 #define POWEROF2(num) (((num) & ((num) - 1)) == 0) 26 27 char *calloc(); 28 char *index(); 29 30 setup(dev) 31 char *dev; 32 { 33 dev_t rootdev; 34 long cg, ncg, size, asked, i, j; 35 struct disklabel *getdisklabel(), *lp; 36 struct stat statb; 37 struct fs proto; 38 39 havesb = 0; 40 if (stat("/", &statb) < 0) 41 errexit("Can't stat root\n"); 42 rootdev = statb.st_dev; 43 if (stat(dev, &statb) < 0) { 44 perror(dev); 45 printf("Can't stat %s\n", dev); 46 return (0); 47 } 48 rawflg = 0; 49 if ((statb.st_mode & S_IFMT) == S_IFBLK) 50 ; 51 else if ((statb.st_mode & S_IFMT) == S_IFCHR) 52 rawflg++; 53 else { 54 if (reply("file is not a block or character device; OK") == 0) 55 return (0); 56 } 57 if (rootdev == statb.st_rdev) 58 hotroot++; 59 if ((dfile.rfdes = open(dev, O_RDONLY)) < 0) { 60 perror(dev); 61 printf("Can't open %s\n", dev); 62 return (0); 63 } 64 if (preen == 0) 65 printf("** %s", dev); 66 if (nflag || (dfile.wfdes = open(dev, O_WRONLY)) < 0) { 67 dfile.wfdes = -1; 68 if (preen) 69 pfatal("NO WRITE ACCESS"); 70 printf(" (NO WRITE)"); 71 } 72 if (preen == 0) 73 printf("\n"); 74 dfile.mod = 0; 75 lfdir = 0; 76 initbarea(&sblk); 77 initbarea(&fileblk); 78 initbarea(&inoblk); 79 initbarea(&cgblk); 80 initbarea(&asblk); 81 if (lp = getdisklabel((char *)NULL, dfile.rfdes)) 82 dev_bsize = secsize = lp->d_secsize; 83 else 84 dev_bsize = secsize = DEV_BSIZE; 85 /* 86 * Read in the superblock, looking for alternates if necessary 87 */ 88 if (readsb(1) == 0) { 89 if (bflag || preen || calcsb(dev, dfile.rfdes, &proto) == 0) 90 return(0); 91 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 92 return (0); 93 for (cg = 0; cg < proto.fs_ncg; cg++) { 94 bflag = fsbtodb(&proto, cgsblock(&proto, cg)); 95 if (readsb(0) != 0) 96 break; 97 } 98 if (cg >= proto.fs_ncg) { 99 printf("%s %s\n%s %s\n%s %s\n", 100 "SEARCH FOR ALTERNATE SUPER-BLOCK", 101 "FAILED. YOU MUST USE THE", 102 "-b OPTION TO FSCK TO SPECIFY THE", 103 "LOCATION OF AN ALTERNATE", 104 "SUPER-BLOCK TO SUPPLY NEEDED", 105 "INFORMATION; SEE fsck(8)."); 106 return(0); 107 } 108 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 109 } 110 fmax = sblock.fs_size; 111 imax = sblock.fs_ncg * sblock.fs_ipg; 112 /* 113 * Check and potentially fix certain fields in the super block. 114 */ 115 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) { 116 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 117 if (reply("SET TO DEFAULT") == 1) { 118 sblock.fs_optim = FS_OPTTIME; 119 sbdirty(); 120 } 121 } 122 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) { 123 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 124 sblock.fs_minfree); 125 if (reply("SET TO DEFAULT") == 1) { 126 sblock.fs_minfree = 10; 127 sbdirty(); 128 } 129 } 130 if (sblock.fs_interleave < 1) { 131 pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK", 132 sblock.fs_interleave); 133 sblock.fs_interleave = 1; 134 if (preen) 135 printf(" (FIXED)\n"); 136 if (preen || reply("SET TO DEFAULT") == 1) { 137 sbdirty(); 138 dirty(&asblk); 139 } 140 } 141 if (sblock.fs_npsect < sblock.fs_nsect) { 142 pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", 143 sblock.fs_npsect); 144 sblock.fs_npsect = sblock.fs_nsect; 145 if (preen) 146 printf(" (FIXED)\n"); 147 if (preen || reply("SET TO DEFAULT") == 1) { 148 sbdirty(); 149 dirty(&asblk); 150 } 151 } 152 if (sblock.fs_postblformat == FS_42POSTBLFMT) { 153 pwarn("OLD FILE SYSTEM FORMAT\n"); 154 if (!preen && reply("CONVERT TO NEW FILE SYSTEM FORMAT") == 1) { 155 cvtflag++; 156 sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT; 157 sblock.fs_nrpos = 8; 158 sblock.fs_postbloff = 159 (char *)(&sblock.fs_opostbl[0][0]) - 160 (char *)(&sblock.fs_link); 161 sblock.fs_rotbloff = &sblock.fs_space[0] - 162 (u_char *)(&sblock.fs_link); 163 /* 164 * Planning now for future expansion. 165 */ 166 # if (BYTE_ORDER == BIG_ENDIAN) 167 sblock.fs_qbmask.val[0] = 0; 168 sblock.fs_qbmask.val[1] = ~sblock.fs_bmask; 169 sblock.fs_qfmask.val[0] = 0; 170 sblock.fs_qfmask.val[1] = ~sblock.fs_fmask; 171 # endif /* BIG_ENDIAN */ 172 # if (BYTE_ORDER == LITTLE_ENDIAN) 173 sblock.fs_qbmask.val[0] = ~sblock.fs_bmask; 174 sblock.fs_qbmask.val[1] = 0; 175 sblock.fs_qfmask.val[0] = ~sblock.fs_fmask; 176 sblock.fs_qfmask.val[1] = 0; 177 # endif /* LITTLE_ENDIAN */ 178 sbdirty(); 179 dirty(&asblk); 180 } 181 } else if (cvtflag) { 182 /* 183 * Requested to convert from new format to old format 184 */ 185 if (sblock.fs_nrpos != 8 || sblock.fs_ipg > 2048 || 186 sblock.fs_cpg > 32) { 187 printf("PARAMETERS OF CURRENT FILE SYSTEM DO NOT\n\t"); 188 errexit("ALLOW CONVERSION TO OLD FILE SYSTEM FORMAT\n"); 189 } 190 pwarn("CONVERTING TO OLD FILE SYSTEM FORMAT\n"); 191 sblock.fs_postblformat = FS_42POSTBLFMT; 192 sbdirty(); 193 dirty(&asblk); 194 } 195 if (asblk.b_dirty) { 196 bcopy((char *)&sblock, (char *)&altsblock, sblock.fs_sbsize); 197 flush(&dfile, &asblk); 198 } 199 /* 200 * read in the summary info. 201 */ 202 asked = 0; 203 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 204 size = sblock.fs_cssize - i < sblock.fs_bsize ? 205 sblock.fs_cssize - i : sblock.fs_bsize; 206 sblock.fs_csp[j] = (struct csum *)calloc(1, (unsigned)size); 207 if (bread(&dfile, (char *)sblock.fs_csp[j], 208 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 209 size) != 0 && !asked) { 210 pfatal("BAD SUMMARY INFORMATION"); 211 if (reply("CONTINUE") == 0) 212 errexit(""); 213 asked++; 214 } 215 } 216 /* 217 * allocate and initialize the necessary maps 218 */ 219 bmapsz = roundup(howmany(fmax, NBBY), sizeof(short)); 220 blockmap = calloc((unsigned)bmapsz, sizeof (char)); 221 if (blockmap == NULL) { 222 printf("cannot alloc %d bytes for blockmap\n", bmapsz); 223 goto badsb; 224 } 225 statemap = calloc((unsigned)(imax + 1), sizeof(char)); 226 if (statemap == NULL) { 227 printf("cannot alloc %d bytes for statemap\n", imax + 1); 228 goto badsb; 229 } 230 lncntp = (short *)calloc((unsigned)(imax + 1), sizeof(short)); 231 if (lncntp == NULL) { 232 printf("cannot alloc %d bytes for lncntp\n", 233 (imax + 1) * sizeof(short)); 234 goto badsb; 235 } 236 237 return (1); 238 239 badsb: 240 ckfini(); 241 return (0); 242 } 243 244 /* 245 * Read in the super block and its summary info. 246 */ 247 readsb(listerr) 248 int listerr; 249 { 250 off_t sboff; 251 daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 252 253 if (bread(&dfile, (char *)&sblock, super, (long)SBSIZE) != 0) 254 return (0); 255 sblk.b_bno = super; 256 sblk.b_size = SBSIZE; 257 /* 258 * run a few consistency checks of the super block 259 */ 260 if (sblock.fs_magic != FS_MAGIC) 261 { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); } 262 if (sblock.fs_ncg < 1) 263 { badsb(listerr, "NCG OUT OF RANGE"); return (0); } 264 if (sblock.fs_cpg < 1) 265 { badsb(listerr, "CPG OUT OF RANGE"); return (0); } 266 if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl || 267 (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl) 268 { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); } 269 if (sblock.fs_sbsize > SBSIZE) 270 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } 271 /* 272 * Compute block size that the filesystem is based on, 273 * according to fsbtodb, and adjust superblock block number 274 * so we can tell if this is an alternate later. 275 */ 276 super *= dev_bsize; 277 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1); 278 sblk.b_bno = super / dev_bsize; 279 /* 280 * Set all possible fields that could differ, then do check 281 * of whole super block against an alternate super block. 282 * When an alternate super-block is specified this check is skipped. 283 */ 284 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); 285 if (asblk.b_errs != NULL) 286 return (0); 287 if (bflag) { 288 havesb = 1; 289 return (1); 290 } 291 altsblock.fs_link = sblock.fs_link; 292 altsblock.fs_rlink = sblock.fs_rlink; 293 altsblock.fs_time = sblock.fs_time; 294 altsblock.fs_cstotal = sblock.fs_cstotal; 295 altsblock.fs_cgrotor = sblock.fs_cgrotor; 296 altsblock.fs_fmod = sblock.fs_fmod; 297 altsblock.fs_clean = sblock.fs_clean; 298 altsblock.fs_ronly = sblock.fs_ronly; 299 altsblock.fs_flags = sblock.fs_flags; 300 altsblock.fs_maxcontig = sblock.fs_maxcontig; 301 altsblock.fs_minfree = sblock.fs_minfree; 302 altsblock.fs_optim = sblock.fs_optim; 303 altsblock.fs_rotdelay = sblock.fs_rotdelay; 304 altsblock.fs_maxbpg = sblock.fs_maxbpg; 305 bcopy((char *)sblock.fs_csp, (char *)altsblock.fs_csp, 306 sizeof sblock.fs_csp); 307 bcopy((char *)sblock.fs_fsmnt, (char *)altsblock.fs_fsmnt, 308 sizeof sblock.fs_fsmnt); 309 bcopy((char *)sblock.fs_sparecon, (char *)altsblock.fs_sparecon, 310 sizeof sblock.fs_sparecon); 311 /* 312 * The following should not have to be copied. 313 */ 314 altsblock.fs_fsbtodb = sblock.fs_fsbtodb; 315 altsblock.fs_interleave = sblock.fs_interleave; 316 altsblock.fs_npsect = sblock.fs_npsect; 317 altsblock.fs_nrpos = sblock.fs_nrpos; 318 if (bcmp((char *)&sblock, (char *)&altsblock, (int)sblock.fs_sbsize)) { 319 badsb(listerr, 320 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 321 return (0); 322 } 323 havesb = 1; 324 return (1); 325 } 326 327 badsb(listerr, s) 328 int listerr; 329 char *s; 330 { 331 332 if (!listerr) 333 return; 334 if (preen) 335 printf("%s: ", devname); 336 pfatal("BAD SUPER BLOCK: %s\n", s); 337 } 338 339 /* 340 * Calculate a prototype superblock based on information in the disk label. 341 * When done the cgsblock macro can be calculated and the fs_ncg field 342 * can be used. Do NOT attempt to use other macros without verifying that 343 * their needed information is available! 344 */ 345 calcsb(dev, devfd, fs) 346 char *dev; 347 int devfd; 348 register struct fs *fs; 349 { 350 register struct disklabel *lp; 351 register struct partition *pp; 352 register char *cp; 353 int i; 354 struct disklabel *getdisklabel(); 355 356 cp = index(dev, '\0') - 1; 357 if (cp == (char *)-1 || (*cp < 'a' || *cp > 'h') && !isdigit(*cp)) { 358 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 359 return (0); 360 } 361 lp = getdisklabel(dev, devfd); 362 if (isdigit(*cp)) 363 pp = &lp->d_partitions[0]; 364 else 365 pp = &lp->d_partitions[*cp - 'a']; 366 if (pp->p_fstype != FS_BSDFFS) { 367 pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n", 368 dev, pp->p_fstype < FSMAXTYPES ? 369 fstypenames[pp->p_fstype] : "unknown"); 370 return (0); 371 } 372 bzero(fs, sizeof(struct fs)); 373 fs->fs_fsize = pp->p_fsize; 374 fs->fs_frag = pp->p_frag; 375 fs->fs_cpg = pp->p_cpg; 376 fs->fs_size = pp->p_size; 377 fs->fs_ntrak = lp->d_ntracks; 378 fs->fs_nsect = lp->d_nsectors; 379 fs->fs_spc = lp->d_secpercyl; 380 fs->fs_nspf = fs->fs_fsize / lp->d_secsize; 381 fs->fs_sblkno = roundup( 382 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 383 fs->fs_frag); 384 fs->fs_cgmask = 0xffffffff; 385 for (i = fs->fs_ntrak; i > 1; i >>= 1) 386 fs->fs_cgmask <<= 1; 387 if (!POWEROF2(fs->fs_ntrak)) 388 fs->fs_cgmask <<= 1; 389 fs->fs_cgoffset = roundup( 390 howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag); 391 fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs); 392 fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg); 393 for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1) 394 fs->fs_fsbtodb++; 395 dev_bsize = lp->d_secsize; 396 return (1); 397 } 398 399 struct disklabel * 400 getdisklabel(s, fd) 401 char *s; 402 int fd; 403 { 404 static struct disklabel lab; 405 406 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 407 if (s == NULL) 408 return ((struct disklabel *)NULL); 409 pwarn(""); 410 perror("ioctl (GDINFO)"); 411 errexit("%s: can't read disk label", s); 412 } 413 return (&lab); 414 } 415