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 5.4 (Berkeley) 01/15/87"; 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 /* 119 * read in the summary info. 120 */ 121 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 122 size = sblock.fs_cssize - i < sblock.fs_bsize ? 123 sblock.fs_cssize - i : sblock.fs_bsize; 124 sblock.fs_csp[j] = (struct csum *)calloc(1, (unsigned)size); 125 if (bread(&dfile, (char *)sblock.fs_csp[j], 126 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 127 size) != 0) 128 return (0); 129 } 130 /* 131 * allocate and initialize the necessary maps 132 */ 133 bmapsz = roundup(howmany(fmax, NBBY), sizeof(short)); 134 blockmap = calloc((unsigned)bmapsz, sizeof (char)); 135 if (blockmap == NULL) { 136 printf("cannot alloc %d bytes for blockmap\n", bmapsz); 137 goto badsb; 138 } 139 statemap = calloc((unsigned)(imax + 1), sizeof(char)); 140 if (statemap == NULL) { 141 printf("cannot alloc %d bytes for statemap\n", imax + 1); 142 goto badsb; 143 } 144 lncntp = (short *)calloc((unsigned)(imax + 1), sizeof(short)); 145 if (lncntp == NULL) { 146 printf("cannot alloc %d bytes for lncntp\n", 147 (imax + 1) * sizeof(short)); 148 goto badsb; 149 } 150 151 return (1); 152 153 badsb: 154 ckfini(); 155 return (0); 156 } 157 158 /* 159 * Read in the super block and its summary info. 160 */ 161 readsb(listerr) 162 int listerr; 163 { 164 BUFAREA asblk; 165 # define altsblock asblk.b_un.b_fs 166 daddr_t super = bflag ? bflag : SBLOCK; 167 168 initbarea(&asblk); 169 if (bread(&dfile, (char *)&sblock, super, (long)SBSIZE) != 0) 170 return (0); 171 sblk.b_bno = super; 172 sblk.b_size = SBSIZE; 173 /* 174 * run a few consistency checks of the super block 175 */ 176 if (sblock.fs_magic != FS_MAGIC) 177 { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); } 178 if (sblock.fs_ncg < 1) 179 { badsb(listerr, "NCG OUT OF RANGE"); return (0); } 180 if (sblock.fs_cpg < 1 || sblock.fs_cpg > MAXCPG) 181 { badsb(listerr, "CPG OUT OF RANGE"); return (0); } 182 if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl || 183 (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl) 184 { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); } 185 if (sblock.fs_sbsize > SBSIZE) 186 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } 187 /* 188 * Set all possible fields that could differ, then do check 189 * of whole super block against an alternate super block. 190 * When an alternate super-block is specified this check is skipped. 191 */ 192 if (bflag) 193 return (1); 194 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); 195 if (asblk.b_errs != NULL) 196 return (0); 197 altsblock.fs_link = sblock.fs_link; 198 altsblock.fs_rlink = sblock.fs_rlink; 199 altsblock.fs_time = sblock.fs_time; 200 altsblock.fs_cstotal = sblock.fs_cstotal; 201 altsblock.fs_cgrotor = sblock.fs_cgrotor; 202 altsblock.fs_fmod = sblock.fs_fmod; 203 altsblock.fs_clean = sblock.fs_clean; 204 altsblock.fs_ronly = sblock.fs_ronly; 205 altsblock.fs_flags = sblock.fs_flags; 206 altsblock.fs_maxcontig = sblock.fs_maxcontig; 207 altsblock.fs_minfree = sblock.fs_minfree; 208 altsblock.fs_optim = sblock.fs_optim; 209 altsblock.fs_rotdelay = sblock.fs_rotdelay; 210 altsblock.fs_maxbpg = sblock.fs_maxbpg; 211 bcopy((char *)sblock.fs_csp, (char *)altsblock.fs_csp, 212 sizeof sblock.fs_csp); 213 bcopy((char *)sblock.fs_fsmnt, (char *)altsblock.fs_fsmnt, 214 sizeof sblock.fs_fsmnt); 215 if (bcmp((char *)&sblock, (char *)&altsblock, (int)sblock.fs_sbsize)) 216 { badsb(listerr, "TRASHED VALUES IN SUPER BLOCK"); return (0); } 217 return (1); 218 # undef altsblock 219 } 220 221 badsb(listerr, s) 222 int listerr; 223 char *s; 224 { 225 226 if (!listerr) 227 return; 228 if (preen) 229 printf("%s: ", devname); 230 pfatal("BAD SUPER BLOCK: %s\n", s); 231 } 232 233 /* 234 * Calculate a prototype superblock based on information in the disk label. 235 * When done the cgsblock macro can be calculated and the fs_ncg field 236 * can be used. Do NOT attempt to use other macros without verifying that 237 * their needed information is available! 238 */ 239 calcsb(dev, devfd, fs) 240 char *dev; 241 int devfd; 242 register struct fs *fs; 243 { 244 register struct disklabel *lp; 245 register struct partition *pp; 246 register char *cp; 247 struct disklabel *getdisklabel(); 248 int i; 249 250 cp = index(dev, '\0') - 1; 251 if (cp == (char *)-1 || (*cp < 'a' || *cp > 'h') && !isdigit(*cp)) { 252 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 253 return (0); 254 } 255 lp = getdisklabel(dev, devfd); 256 if (isdigit(*cp)) 257 pp = &lp->d_partitions[0]; 258 else 259 pp = &lp->d_partitions[*cp - 'a']; 260 if (pp->p_fstype != FS_BSDFFS) { 261 pfatal("%s: NOT FORMATTED AS A BSD FILE SYSTEM (%s)\n", 262 dev, pp->p_fstype < FSMAXTYPES ? 263 fstypenames[pp->p_fstype] : "unknown"); 264 return (0); 265 } 266 bzero(fs, sizeof(struct fs)); 267 fs->fs_fsize = pp->p_fsize; 268 fs->fs_frag = pp->p_frag; 269 fs->fs_cpg = pp->p_cpg; 270 fs->fs_size = pp->p_size; 271 fs->fs_ntrak = lp->d_ntracks; 272 fs->fs_nsect = lp->d_nsectors; 273 fs->fs_spc = lp->d_secpercyl; 274 fs->fs_nspf = fs->fs_fsize / lp->d_secsize; 275 fs->fs_sblkno = roundup( 276 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 277 fs->fs_frag); 278 fs->fs_cgmask = 0xffffffff; 279 for (i = fs->fs_ntrak; i > 1; i >>= 1) 280 fs->fs_cgmask <<= 1; 281 if (!POWEROF2(fs->fs_ntrak)) 282 fs->fs_cgmask <<= 1; 283 fs->fs_cgoffset = roundup( 284 howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag); 285 fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs); 286 fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg); 287 for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1) 288 fs->fs_fsbtodb++; 289 return (1); 290 } 291 292 #ifdef byioctl 293 struct disklabel * 294 getdisklabel(s, fd) 295 char *s; 296 int fd; 297 { 298 static struct disklabel lab; 299 300 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 301 perror("ioctl (GDINFO)"); 302 fatal("%s: can't read disk label", s); 303 } 304 return (&lab); 305 } 306 #else byioctl 307 char specname[64]; 308 char boot[BBSIZE]; 309 310 struct disklabel * 311 getdisklabel(s, fd) 312 char *s; 313 int fd; 314 { 315 char *cp; 316 u_long magic = htonl(DISKMAGIC); 317 register struct disklabel *lp; 318 int cfd; 319 320 /* 321 * Make name for 'c' partition. 322 */ 323 strcpy(specname, s); 324 cp = specname + strlen(specname) - 1; 325 if (!isdigit(*cp)) 326 *cp = 'c'; 327 cfd = open(specname, O_RDONLY); 328 if (cfd < 0) { 329 perror(specname); 330 exit(2); 331 } 332 333 if (read(cfd, boot, BBSIZE) < BBSIZE) { 334 perror(specname); 335 exit(2); 336 } 337 close(cfd); 338 for (lp = (struct disklabel *)(boot + LABELOFFSET); 339 lp <= (struct disklabel *)(boot + BBSIZE - 340 sizeof(struct disklabel)); 341 lp = (struct disklabel *)((char *)lp + 128)) 342 if (lp->d_magic == magic && lp->d_magic2 == magic) 343 break; 344 if (lp > (struct disklabel *)(boot + BBSIZE - 345 sizeof(struct disklabel)) || 346 lp->d_magic != magic || lp->d_magic2 != magic || 347 dkcksum(lp) != 0) { 348 printf("Bad pack magic number %s\n", 349 "(label is damaged, or pack is unlabeled)"); 350 exit(1); 351 } 352 #if ENDIAN != BIG 353 swablabel(lp); 354 #endif 355 return (lp); 356 } 357 #endif byioctl 358