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 5.7 (Berkeley) 02/18/87"; 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 <ctype.h> 20 #include "fsck.h" 21 22 #define POWEROF2(num) (((num) & ((num) - 1)) == 0) 23 24 char *calloc(); 25 char *index(); 26 27 setup(dev) 28 char *dev; 29 { 30 dev_t rootdev; 31 long cg, ncg, size, i, j; 32 struct stat statb; 33 struct fs proto; 34 35 if (stat("/", &statb) < 0) 36 errexit("Can't stat root\n"); 37 rootdev = statb.st_dev; 38 if (stat(dev, &statb) < 0) { 39 printf("Can't stat %s\n", dev); 40 return (0); 41 } 42 rawflg = 0; 43 if ((statb.st_mode & S_IFMT) == S_IFBLK) 44 ; 45 else if ((statb.st_mode & S_IFMT) == S_IFCHR) 46 rawflg++; 47 else { 48 if (reply("file is not a block or character device; OK") == 0) 49 return (0); 50 } 51 if (rootdev == statb.st_rdev) 52 hotroot++; 53 if ((dfile.rfdes = open(dev, O_RDONLY)) < 0) { 54 printf("Can't open %s\n", dev); 55 return (0); 56 } 57 if (preen == 0) 58 printf("** %s", dev); 59 if (nflag || (dfile.wfdes = open(dev, O_WRONLY)) < 0) { 60 dfile.wfdes = -1; 61 if (preen) 62 pfatal("NO WRITE ACCESS"); 63 printf(" (NO WRITE)"); 64 } 65 if (preen == 0) 66 printf("\n"); 67 dfile.mod = 0; 68 lfdir = 0; 69 initbarea(&sblk); 70 initbarea(&fileblk); 71 initbarea(&inoblk); 72 initbarea(&cgblk); 73 /* 74 * Read in the superblock, looking for alternates if necessary 75 */ 76 if (readsb(1) == 0) { 77 if (bflag || calcsb(dev, dfile.rfdes, &proto) == 0 || preen) 78 return(0); 79 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 80 return (0); 81 for (cg = 0; cg < proto.fs_ncg; cg++) { 82 bflag = fsbtodb(&proto, cgsblock(&proto, cg)); 83 if (readsb(0) != 0) 84 break; 85 } 86 if (cg >= proto.fs_ncg) { 87 printf("%s %s\n%s %s\n%s %s\n", 88 "SEARCH FOR ALTERNATE SUPER-BLOCK", 89 "FAILED. YOU MUST USE THE", 90 "-b OPTION TO FSCK TO SPECIFY THE", 91 "LOCATION OF AN ALTERNATE", 92 "SUPER-BLOCK TO SUPPLY NEEDED", 93 "INFORMATION; SEE fsck(8)."); 94 return(0); 95 } 96 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 97 } 98 fmax = sblock.fs_size; 99 imax = sblock.fs_ncg * sblock.fs_ipg; 100 /* 101 * Check and potentially fix certain fields in the super block. 102 */ 103 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) { 104 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 105 if (reply("SET TO DEFAULT") == 1) { 106 sblock.fs_optim = FS_OPTTIME; 107 sbdirty(); 108 } 109 } 110 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) { 111 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 112 sblock.fs_minfree); 113 if (reply("SET TO DEFAULT") == 1) { 114 sblock.fs_minfree = 10; 115 sbdirty(); 116 } 117 } 118 if (sblock.fs_interleave < 1) { 119 pfatal("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK", 120 sblock.fs_interleave); 121 if (reply("SET TO DEFAULT") == 1) { 122 sblock.fs_interleave = 1; 123 sbdirty(); 124 } 125 } 126 if (sblock.fs_npsect < sblock.fs_nsect) { 127 pfatal("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", 128 sblock.fs_npsect); 129 if (reply("SET TO DEFAULT") == 1) { 130 sblock.fs_npsect = sblock.fs_nsect; 131 sbdirty(); 132 } 133 } 134 /* 135 * read in the summary info. 136 */ 137 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 138 size = sblock.fs_cssize - i < sblock.fs_bsize ? 139 sblock.fs_cssize - i : sblock.fs_bsize; 140 sblock.fs_csp[j] = (struct csum *)calloc(1, (unsigned)size); 141 if (bread(&dfile, (char *)sblock.fs_csp[j], 142 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 143 size) != 0) 144 return (0); 145 } 146 /* 147 * allocate and initialize the necessary maps 148 */ 149 bmapsz = roundup(howmany(fmax, NBBY), sizeof(short)); 150 blockmap = calloc((unsigned)bmapsz, sizeof (char)); 151 if (blockmap == NULL) { 152 printf("cannot alloc %d bytes for blockmap\n", bmapsz); 153 goto badsb; 154 } 155 statemap = calloc((unsigned)(imax + 1), sizeof(char)); 156 if (statemap == NULL) { 157 printf("cannot alloc %d bytes for statemap\n", imax + 1); 158 goto badsb; 159 } 160 lncntp = (short *)calloc((unsigned)(imax + 1), sizeof(short)); 161 if (lncntp == NULL) { 162 printf("cannot alloc %d bytes for lncntp\n", 163 (imax + 1) * sizeof(short)); 164 goto badsb; 165 } 166 167 return (1); 168 169 badsb: 170 ckfini(); 171 return (0); 172 } 173 174 /* 175 * Read in the super block and its summary info. 176 */ 177 readsb(listerr) 178 int listerr; 179 { 180 BUFAREA asblk; 181 # define altsblock asblk.b_un.b_fs 182 daddr_t super = bflag ? bflag : SBLOCK; 183 184 initbarea(&asblk); 185 dev_bsize = DEV_BSIZE; 186 if (bread(&dfile, (char *)&sblock, super, (long)SBSIZE) != 0) 187 return (0); 188 sblk.b_bno = super; 189 sblk.b_size = SBSIZE; 190 /* 191 * run a few consistency checks of the super block 192 */ 193 if (sblock.fs_magic != FS_MAGIC) 194 { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); } 195 if (sblock.fs_ncg < 1) 196 { badsb(listerr, "NCG OUT OF RANGE"); return (0); } 197 if (sblock.fs_cpg < 1 || sblock.fs_cpg > MAXCPG) 198 { badsb(listerr, "CPG OUT OF RANGE"); return (0); } 199 if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl || 200 (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl) 201 { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); } 202 if (sblock.fs_sbsize > SBSIZE) 203 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } 204 /* 205 * Set all possible fields that could differ, then do check 206 * of whole super block against an alternate super block. 207 * When an alternate super-block is specified this check is skipped. 208 */ 209 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1); 210 sblk.b_bno = sblk.b_bno * DEV_BSIZE / dev_bsize; 211 if (bflag) 212 return (1); 213 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); 214 if (asblk.b_errs != NULL) 215 return (0); 216 altsblock.fs_link = sblock.fs_link; 217 altsblock.fs_rlink = sblock.fs_rlink; 218 altsblock.fs_time = sblock.fs_time; 219 altsblock.fs_cstotal = sblock.fs_cstotal; 220 altsblock.fs_cgrotor = sblock.fs_cgrotor; 221 altsblock.fs_fmod = sblock.fs_fmod; 222 altsblock.fs_clean = sblock.fs_clean; 223 altsblock.fs_ronly = sblock.fs_ronly; 224 altsblock.fs_flags = sblock.fs_flags; 225 altsblock.fs_maxcontig = sblock.fs_maxcontig; 226 altsblock.fs_minfree = sblock.fs_minfree; 227 altsblock.fs_optim = sblock.fs_optim; 228 altsblock.fs_rotdelay = sblock.fs_rotdelay; 229 altsblock.fs_maxbpg = sblock.fs_maxbpg; 230 altsblock.fs_npsect = sblock.fs_npsect; 231 altsblock.fs_interleave = sblock.fs_interleave; 232 bcopy((char *)sblock.fs_csp, (char *)altsblock.fs_csp, 233 sizeof sblock.fs_csp); 234 bcopy((char *)sblock.fs_fsmnt, (char *)altsblock.fs_fsmnt, 235 sizeof sblock.fs_fsmnt); 236 if (bcmp((char *)&sblock, (char *)&altsblock, (int)sblock.fs_sbsize)) 237 { badsb(listerr, "TRASHED VALUES IN SUPER BLOCK"); return (0); } 238 return (1); 239 # undef altsblock 240 } 241 242 badsb(listerr, s) 243 int listerr; 244 char *s; 245 { 246 247 if (!listerr) 248 return; 249 if (preen) 250 printf("%s: ", devname); 251 pfatal("BAD SUPER BLOCK: %s\n", s); 252 } 253 254 /* 255 * Calculate a prototype superblock based on information in the disk label. 256 * When done the cgsblock macro can be calculated and the fs_ncg field 257 * can be used. Do NOT attempt to use other macros without verifying that 258 * their needed information is available! 259 */ 260 calcsb(dev, devfd, fs) 261 char *dev; 262 int devfd; 263 register struct fs *fs; 264 { 265 register struct disklabel *lp; 266 register struct partition *pp; 267 register char *cp; 268 struct disklabel *getdisklabel(); 269 int i; 270 271 cp = index(dev, '\0') - 1; 272 if (cp == (char *)-1 || (*cp < 'a' || *cp > 'h') && !isdigit(*cp)) { 273 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 274 return (0); 275 } 276 lp = getdisklabel(dev, devfd); 277 if (isdigit(*cp)) 278 pp = &lp->d_partitions[0]; 279 else 280 pp = &lp->d_partitions[*cp - 'a']; 281 if (pp->p_fstype != FS_BSDFFS) { 282 pfatal("%s: NOT FORMATTED AS A BSD FILE SYSTEM (%s)\n", 283 dev, pp->p_fstype < FSMAXTYPES ? 284 fstypenames[pp->p_fstype] : "unknown"); 285 return (0); 286 } 287 bzero(fs, sizeof(struct fs)); 288 fs->fs_fsize = pp->p_fsize; 289 fs->fs_frag = pp->p_frag; 290 fs->fs_cpg = pp->p_cpg; 291 fs->fs_size = pp->p_size; 292 fs->fs_ntrak = lp->d_ntracks; 293 fs->fs_nsect = lp->d_nsectors; 294 fs->fs_spc = lp->d_secpercyl; 295 fs->fs_nspf = fs->fs_fsize / lp->d_secsize; 296 fs->fs_sblkno = roundup( 297 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 298 fs->fs_frag); 299 fs->fs_cgmask = 0xffffffff; 300 for (i = fs->fs_ntrak; i > 1; i >>= 1) 301 fs->fs_cgmask <<= 1; 302 if (!POWEROF2(fs->fs_ntrak)) 303 fs->fs_cgmask <<= 1; 304 fs->fs_cgoffset = roundup( 305 howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag); 306 fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs); 307 fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg); 308 for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1) 309 fs->fs_fsbtodb++; 310 return (1); 311 } 312 313 #ifdef byioctl 314 struct disklabel * 315 getdisklabel(s, fd) 316 char *s; 317 int fd; 318 { 319 static struct disklabel lab; 320 321 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 322 perror("ioctl (GDINFO)"); 323 fatal("%s: can't read disk label", s); 324 } 325 return (&lab); 326 } 327 #else byioctl 328 char specname[64]; 329 char boot[BBSIZE]; 330 331 struct disklabel * 332 getdisklabel(s, fd) 333 char *s; 334 int fd; 335 { 336 char *cp; 337 u_long magic = htonl(DISKMAGIC); 338 register struct disklabel *lp; 339 int cfd; 340 341 /* 342 * Make name for 'c' partition. 343 */ 344 strcpy(specname, s); 345 cp = specname + strlen(specname) - 1; 346 if (!isdigit(*cp)) 347 *cp = 'c'; 348 cfd = open(specname, O_RDONLY); 349 if (cfd < 0) { 350 perror(specname); 351 exit(2); 352 } 353 354 if (read(cfd, boot, BBSIZE) < BBSIZE) { 355 perror(specname); 356 exit(2); 357 } 358 close(cfd); 359 for (lp = (struct disklabel *)(boot + LABELOFFSET); 360 lp <= (struct disklabel *)(boot + BBSIZE - 361 sizeof(struct disklabel)); 362 lp = (struct disklabel *)((char *)lp + 128)) 363 if (lp->d_magic == magic && lp->d_magic2 == magic) 364 break; 365 if (lp > (struct disklabel *)(boot + BBSIZE - 366 sizeof(struct disklabel)) || 367 lp->d_magic != magic || lp->d_magic2 != magic || 368 dkcksum(lp) != 0) { 369 printf("Bad pack magic number %s\n", 370 "(label is damaged, or pack is unlabeled)"); 371 exit(1); 372 } 373 #if ENDIAN != BIG 374 swablabel(lp); 375 #endif 376 return (lp); 377 } 378 #endif byioctl 379