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 5.10 (Berkeley) 03/05/87"; 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 perror(dev); 40 printf("Can't stat %s\n", dev); 41 return (0); 42 } 43 rawflg = 0; 44 if ((statb.st_mode & S_IFMT) == S_IFBLK) 45 ; 46 else if ((statb.st_mode & S_IFMT) == S_IFCHR) 47 rawflg++; 48 else { 49 if (reply("file is not a block or character device; OK") == 0) 50 return (0); 51 } 52 if (rootdev == statb.st_rdev) 53 hotroot++; 54 if ((dfile.rfdes = open(dev, O_RDONLY)) < 0) { 55 perror(dev); 56 printf("Can't open %s\n", dev); 57 return (0); 58 } 59 if (preen == 0) 60 printf("** %s", dev); 61 if (nflag || (dfile.wfdes = open(dev, O_WRONLY)) < 0) { 62 dfile.wfdes = -1; 63 if (preen) 64 pfatal("NO WRITE ACCESS"); 65 printf(" (NO WRITE)"); 66 } 67 if (preen == 0) 68 printf("\n"); 69 dfile.mod = 0; 70 lfdir = 0; 71 initbarea(&sblk); 72 initbarea(&fileblk); 73 initbarea(&inoblk); 74 initbarea(&cgblk); 75 /* 76 * Read in the superblock, looking for alternates if necessary 77 */ 78 if (readsb(1) == 0) { 79 if (bflag || calcsb(dev, dfile.rfdes, &proto) == 0 || preen) 80 return(0); 81 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 82 return (0); 83 for (cg = 0; cg < proto.fs_ncg; cg++) { 84 bflag = fsbtodb(&proto, cgsblock(&proto, cg)); 85 if (readsb(0) != 0) 86 break; 87 } 88 if (cg >= proto.fs_ncg) { 89 printf("%s %s\n%s %s\n%s %s\n", 90 "SEARCH FOR ALTERNATE SUPER-BLOCK", 91 "FAILED. YOU MUST USE THE", 92 "-b OPTION TO FSCK TO SPECIFY THE", 93 "LOCATION OF AN ALTERNATE", 94 "SUPER-BLOCK TO SUPPLY NEEDED", 95 "INFORMATION; SEE fsck(8)."); 96 return(0); 97 } 98 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 99 } 100 fmax = sblock.fs_size; 101 imax = sblock.fs_ncg * sblock.fs_ipg; 102 /* 103 * Check and potentially fix certain fields in the super block. 104 */ 105 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) { 106 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 107 if (reply("SET TO DEFAULT") == 1) { 108 sblock.fs_optim = FS_OPTTIME; 109 sbdirty(); 110 } 111 } 112 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) { 113 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 114 sblock.fs_minfree); 115 if (reply("SET TO DEFAULT") == 1) { 116 sblock.fs_minfree = 10; 117 sbdirty(); 118 } 119 } 120 if (sblock.fs_interleave < 1) { 121 pfatal("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK", 122 sblock.fs_interleave); 123 sblock.fs_interleave = 1; 124 if (reply("SET TO DEFAULT") == 1) 125 sbdirty(); 126 } 127 if (sblock.fs_npsect < sblock.fs_nsect) { 128 pfatal("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", 129 sblock.fs_npsect); 130 sblock.fs_npsect = sblock.fs_nsect; 131 if (reply("SET TO DEFAULT") == 1) 132 sbdirty(); 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 * DEV_BSIZE : SBOFF; 183 184 initbarea(&asblk); 185 dev_bsize = 1; 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; 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_fsbtodb = sblock.fs_fsbtodb; 217 altsblock.fs_link = sblock.fs_link; 218 altsblock.fs_rlink = sblock.fs_rlink; 219 altsblock.fs_time = sblock.fs_time; 220 altsblock.fs_cstotal = sblock.fs_cstotal; 221 altsblock.fs_cgrotor = sblock.fs_cgrotor; 222 altsblock.fs_fmod = sblock.fs_fmod; 223 altsblock.fs_clean = sblock.fs_clean; 224 altsblock.fs_ronly = sblock.fs_ronly; 225 altsblock.fs_flags = sblock.fs_flags; 226 altsblock.fs_maxcontig = sblock.fs_maxcontig; 227 altsblock.fs_minfree = sblock.fs_minfree; 228 altsblock.fs_optim = sblock.fs_optim; 229 altsblock.fs_rotdelay = sblock.fs_rotdelay; 230 altsblock.fs_maxbpg = sblock.fs_maxbpg; 231 altsblock.fs_npsect = sblock.fs_npsect; 232 altsblock.fs_interleave = sblock.fs_interleave; 233 bcopy((char *)sblock.fs_csp, (char *)altsblock.fs_csp, 234 sizeof sblock.fs_csp); 235 bcopy((char *)sblock.fs_fsmnt, (char *)altsblock.fs_fsmnt, 236 sizeof sblock.fs_fsmnt); 237 bcopy((char *)sblock.fs_sparecon, (char *)altsblock.fs_sparecon, 238 sizeof sblock.fs_sparecon); 239 if (bcmp((char *)&sblock, (char *)&altsblock, (int)sblock.fs_sbsize)) { 240 badsb(listerr, 241 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 242 return (0); 243 } 244 return (1); 245 # undef altsblock 246 } 247 248 badsb(listerr, s) 249 int listerr; 250 char *s; 251 { 252 253 if (!listerr) 254 return; 255 if (preen) 256 printf("%s: ", devname); 257 pfatal("BAD SUPER BLOCK: %s\n", s); 258 } 259 260 /* 261 * Calculate a prototype superblock based on information in the disk label. 262 * When done the cgsblock macro can be calculated and the fs_ncg field 263 * can be used. Do NOT attempt to use other macros without verifying that 264 * their needed information is available! 265 */ 266 calcsb(dev, devfd, fs) 267 char *dev; 268 int devfd; 269 register struct fs *fs; 270 { 271 register struct disklabel *lp; 272 register struct partition *pp; 273 register char *cp; 274 struct disklabel *getdisklabel(); 275 int i; 276 277 cp = index(dev, '\0') - 1; 278 if (cp == (char *)-1 || (*cp < 'a' || *cp > 'h') && !isdigit(*cp)) { 279 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 280 return (0); 281 } 282 lp = getdisklabel(dev, devfd); 283 if (isdigit(*cp)) 284 pp = &lp->d_partitions[0]; 285 else 286 pp = &lp->d_partitions[*cp - 'a']; 287 if (pp->p_fstype != FS_BSDFFS) { 288 pfatal("%s: NOT FORMATTED AS A BSD FILE SYSTEM (%s)\n", 289 dev, pp->p_fstype < FSMAXTYPES ? 290 fstypenames[pp->p_fstype] : "unknown"); 291 return (0); 292 } 293 bzero(fs, sizeof(struct fs)); 294 fs->fs_fsize = pp->p_fsize; 295 fs->fs_frag = pp->p_frag; 296 fs->fs_cpg = pp->p_cpg; 297 fs->fs_size = pp->p_size; 298 fs->fs_ntrak = lp->d_ntracks; 299 fs->fs_nsect = lp->d_nsectors; 300 fs->fs_spc = lp->d_secpercyl; 301 fs->fs_nspf = fs->fs_fsize / lp->d_secsize; 302 fs->fs_sblkno = roundup( 303 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 304 fs->fs_frag); 305 fs->fs_cgmask = 0xffffffff; 306 for (i = fs->fs_ntrak; i > 1; i >>= 1) 307 fs->fs_cgmask <<= 1; 308 if (!POWEROF2(fs->fs_ntrak)) 309 fs->fs_cgmask <<= 1; 310 fs->fs_cgoffset = roundup( 311 howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag); 312 fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs); 313 fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg); 314 for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1) 315 fs->fs_fsbtodb++; 316 return (1); 317 } 318 319 struct disklabel * 320 getdisklabel(s, fd) 321 char *s; 322 int fd; 323 { 324 static struct disklabel lab; 325 326 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 327 pwarn(""); 328 perror("ioctl (GDINFO)"); 329 errexit("%s: can't read disk label", s); 330 } 331 return (&lab); 332 } 333