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 5.16 (Berkeley) 04/06/88"; 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 <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, asked, i, j; 32 struct disklabel *getdisklabel(), *lp; 33 struct stat statb; 34 struct fs proto; 35 36 havesb = 0; 37 if (stat("/", &statb) < 0) 38 errexit("Can't stat root\n"); 39 rootdev = statb.st_dev; 40 if (stat(dev, &statb) < 0) { 41 perror(dev); 42 printf("Can't stat %s\n", dev); 43 return (0); 44 } 45 rawflg = 0; 46 if ((statb.st_mode & S_IFMT) == S_IFBLK) 47 ; 48 else if ((statb.st_mode & S_IFMT) == S_IFCHR) 49 rawflg++; 50 else { 51 if (reply("file is not a block or character device; OK") == 0) 52 return (0); 53 } 54 if (rootdev == statb.st_rdev) 55 hotroot++; 56 if ((dfile.rfdes = open(dev, O_RDONLY)) < 0) { 57 perror(dev); 58 printf("Can't open %s\n", dev); 59 return (0); 60 } 61 if (preen == 0) 62 printf("** %s", dev); 63 if (nflag || (dfile.wfdes = open(dev, O_WRONLY)) < 0) { 64 dfile.wfdes = -1; 65 if (preen) 66 pfatal("NO WRITE ACCESS"); 67 printf(" (NO WRITE)"); 68 } 69 if (preen == 0) 70 printf("\n"); 71 dfile.mod = 0; 72 lfdir = 0; 73 initbarea(&sblk); 74 initbarea(&fileblk); 75 initbarea(&inoblk); 76 initbarea(&cgblk); 77 if (lp = getdisklabel((char *)NULL, dfile.rfdes)) 78 dev_bsize = secsize = lp->d_secsize; 79 else { 80 dev_bsize = DEV_BSIZE; 81 secsize = 0; /* guess later */ 82 } 83 /* 84 * Read in the superblock, looking for alternates if necessary 85 */ 86 if (readsb(1) == 0) { 87 if (bflag || preen || calcsb(dev, dfile.rfdes, &proto) == 0) 88 return(0); 89 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 90 return (0); 91 for (cg = 0; cg < proto.fs_ncg; cg++) { 92 bflag = fsbtodb(&proto, cgsblock(&proto, cg)); 93 if (readsb(0) != 0) 94 break; 95 } 96 if (cg >= proto.fs_ncg) { 97 printf("%s %s\n%s %s\n%s %s\n", 98 "SEARCH FOR ALTERNATE SUPER-BLOCK", 99 "FAILED. YOU MUST USE THE", 100 "-b OPTION TO FSCK TO SPECIFY THE", 101 "LOCATION OF AN ALTERNATE", 102 "SUPER-BLOCK TO SUPPLY NEEDED", 103 "INFORMATION; SEE fsck(8)."); 104 return(0); 105 } 106 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 107 } 108 fmax = sblock.fs_size; 109 imax = sblock.fs_ncg * sblock.fs_ipg; 110 /* 111 * Check and potentially fix certain fields in the super block. 112 */ 113 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) { 114 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 115 if (reply("SET TO DEFAULT") == 1) { 116 sblock.fs_optim = FS_OPTTIME; 117 sbdirty(); 118 } 119 } 120 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) { 121 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 122 sblock.fs_minfree); 123 if (reply("SET TO DEFAULT") == 1) { 124 sblock.fs_minfree = 10; 125 sbdirty(); 126 } 127 } 128 if (sblock.fs_interleave < 1) { 129 pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK", 130 sblock.fs_interleave); 131 sblock.fs_interleave = 1; 132 if (preen) 133 printf(" (FIXED)\n"); 134 if (preen || reply("SET TO DEFAULT") == 1) 135 sbdirty(); 136 } 137 if (sblock.fs_npsect < sblock.fs_nsect) { 138 pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", 139 sblock.fs_npsect); 140 sblock.fs_npsect = sblock.fs_nsect; 141 if (preen) 142 printf(" (FIXED)\n"); 143 if (preen || reply("SET TO DEFAULT") == 1) 144 sbdirty(); 145 } 146 /* 147 * read in the summary info. 148 */ 149 asked = 0; 150 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 151 size = sblock.fs_cssize - i < sblock.fs_bsize ? 152 sblock.fs_cssize - i : sblock.fs_bsize; 153 sblock.fs_csp[j] = (struct csum *)calloc(1, (unsigned)size); 154 if (bread(&dfile, (char *)sblock.fs_csp[j], 155 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 156 size) != 0 && !asked) { 157 pfatal("BAD SUMMARY INFORMATION"); 158 if (reply("CONTINUE") == 0) 159 errexit(""); 160 asked++; 161 } 162 } 163 /* 164 * allocate and initialize the necessary maps 165 */ 166 bmapsz = roundup(howmany(fmax, NBBY), sizeof(short)); 167 blockmap = calloc((unsigned)bmapsz, sizeof (char)); 168 if (blockmap == NULL) { 169 printf("cannot alloc %d bytes for blockmap\n", bmapsz); 170 goto badsb; 171 } 172 statemap = calloc((unsigned)(imax + 1), sizeof(char)); 173 if (statemap == NULL) { 174 printf("cannot alloc %d bytes for statemap\n", imax + 1); 175 goto badsb; 176 } 177 lncntp = (short *)calloc((unsigned)(imax + 1), sizeof(short)); 178 if (lncntp == NULL) { 179 printf("cannot alloc %d bytes for lncntp\n", 180 (imax + 1) * sizeof(short)); 181 goto badsb; 182 } 183 184 return (1); 185 186 badsb: 187 ckfini(); 188 return (0); 189 } 190 191 /* 192 * Read in the super block and its summary info. 193 */ 194 readsb(listerr) 195 int listerr; 196 { 197 BUFAREA asblk; 198 # define altsblock asblk.b_un.b_fs 199 off_t sboff; 200 daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 201 202 initbarea(&asblk); 203 if (bread(&dfile, (char *)&sblock, super, (long)SBSIZE) != 0) 204 return (0); 205 sblk.b_bno = super; 206 sblk.b_size = SBSIZE; 207 /* 208 * run a few consistency checks of the super block 209 */ 210 if (sblock.fs_magic != FS_MAGIC) 211 { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); } 212 if (sblock.fs_ncg < 1) 213 { badsb(listerr, "NCG OUT OF RANGE"); return (0); } 214 if (sblock.fs_cpg < 1 || sblock.fs_cpg > MAXCPG) 215 { badsb(listerr, "CPG OUT OF RANGE"); return (0); } 216 if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl || 217 (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl) 218 { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); } 219 if (sblock.fs_sbsize > SBSIZE) 220 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } 221 /* 222 * Compute block size that the filesystem is based on, 223 * according to fsbtodb, and adjust superblock block number 224 * so we can tell if this is an alternate later. 225 */ 226 if (sblock.fs_dbsize && secsize == 0) 227 secsize = sblock.fs_dbsize; 228 super *= dev_bsize; 229 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1); 230 sblk.b_bno = super / dev_bsize; 231 /* 232 * Set all possible fields that could differ, then do check 233 * of whole super block against an alternate super block. 234 * When an alternate super-block is specified this check is skipped. 235 */ 236 if (bflag) { 237 havesb = 1; 238 return (1); 239 } 240 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); 241 if (asblk.b_errs != NULL) 242 return (0); 243 altsblock.fs_fsbtodb = sblock.fs_fsbtodb; 244 altsblock.fs_dbsize = sblock.fs_dbsize; 245 altsblock.fs_link = sblock.fs_link; 246 altsblock.fs_rlink = sblock.fs_rlink; 247 altsblock.fs_time = sblock.fs_time; 248 altsblock.fs_cstotal = sblock.fs_cstotal; 249 altsblock.fs_cgrotor = sblock.fs_cgrotor; 250 altsblock.fs_fmod = sblock.fs_fmod; 251 altsblock.fs_clean = sblock.fs_clean; 252 altsblock.fs_ronly = sblock.fs_ronly; 253 altsblock.fs_flags = sblock.fs_flags; 254 altsblock.fs_maxcontig = sblock.fs_maxcontig; 255 altsblock.fs_minfree = sblock.fs_minfree; 256 altsblock.fs_optim = sblock.fs_optim; 257 altsblock.fs_rotdelay = sblock.fs_rotdelay; 258 altsblock.fs_maxbpg = sblock.fs_maxbpg; 259 altsblock.fs_npsect = sblock.fs_npsect; 260 altsblock.fs_interleave = sblock.fs_interleave; 261 bcopy((char *)sblock.fs_csp, (char *)altsblock.fs_csp, 262 sizeof sblock.fs_csp); 263 bcopy((char *)sblock.fs_fsmnt, (char *)altsblock.fs_fsmnt, 264 sizeof sblock.fs_fsmnt); 265 bcopy((char *)sblock.fs_sparecon, (char *)altsblock.fs_sparecon, 266 sizeof sblock.fs_sparecon); 267 if (bcmp((char *)&sblock, (char *)&altsblock, (int)sblock.fs_sbsize)) { 268 badsb(listerr, 269 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 270 return (0); 271 } 272 havesb = 1; 273 return (1); 274 # undef altsblock 275 } 276 277 badsb(listerr, s) 278 int listerr; 279 char *s; 280 { 281 282 if (!listerr) 283 return; 284 if (preen) 285 printf("%s: ", devname); 286 pfatal("BAD SUPER BLOCK: %s\n", s); 287 } 288 289 /* 290 * Calculate a prototype superblock based on information in the disk label. 291 * When done the cgsblock macro can be calculated and the fs_ncg field 292 * can be used. Do NOT attempt to use other macros without verifying that 293 * their needed information is available! 294 */ 295 calcsb(dev, devfd, fs) 296 char *dev; 297 int devfd; 298 register struct fs *fs; 299 { 300 register struct disklabel *lp; 301 register struct partition *pp; 302 register char *cp; 303 int i; 304 struct disklabel *getdisklabel(); 305 306 cp = index(dev, '\0') - 1; 307 if (cp == (char *)-1 || (*cp < 'a' || *cp > 'h') && !isdigit(*cp)) { 308 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 309 return (0); 310 } 311 lp = getdisklabel(dev, devfd); 312 if (isdigit(*cp)) 313 pp = &lp->d_partitions[0]; 314 else 315 pp = &lp->d_partitions[*cp - 'a']; 316 if (pp->p_fstype != FS_BSDFFS) { 317 pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n", 318 dev, pp->p_fstype < FSMAXTYPES ? 319 fstypenames[pp->p_fstype] : "unknown"); 320 return (0); 321 } 322 bzero(fs, sizeof(struct fs)); 323 fs->fs_fsize = pp->p_fsize; 324 fs->fs_frag = pp->p_frag; 325 fs->fs_cpg = pp->p_cpg; 326 fs->fs_size = pp->p_size; 327 fs->fs_ntrak = lp->d_ntracks; 328 fs->fs_nsect = lp->d_nsectors; 329 fs->fs_spc = lp->d_secpercyl; 330 fs->fs_nspf = fs->fs_fsize / lp->d_secsize; 331 fs->fs_sblkno = roundup( 332 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 333 fs->fs_frag); 334 fs->fs_cgmask = 0xffffffff; 335 for (i = fs->fs_ntrak; i > 1; i >>= 1) 336 fs->fs_cgmask <<= 1; 337 if (!POWEROF2(fs->fs_ntrak)) 338 fs->fs_cgmask <<= 1; 339 fs->fs_cgoffset = roundup( 340 howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag); 341 fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs); 342 fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg); 343 for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1) 344 fs->fs_fsbtodb++; 345 dev_bsize = lp->d_secsize; 346 return (1); 347 } 348 349 struct disklabel * 350 getdisklabel(s, fd) 351 char *s; 352 int fd; 353 { 354 static struct disklabel lab; 355 356 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 357 if (s == NULL) 358 return ((struct disklabel *)NULL); 359 pwarn(""); 360 perror("ioctl (GDINFO)"); 361 errexit("%s: can't read disk label", s); 362 } 363 return (&lab); 364 } 365