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 5.9 (Berkeley) 02/26/87"; 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 if (reply("SET TO DEFAULT") == 1) { 124 sblock.fs_interleave = 1; 125 sbdirty(); 126 } 127 } 128 if (sblock.fs_npsect < sblock.fs_nsect) { 129 pfatal("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", 130 sblock.fs_npsect); 131 if (reply("SET TO DEFAULT") == 1) { 132 sblock.fs_npsect = sblock.fs_nsect; 133 sbdirty(); 134 } 135 } 136 /* 137 * read in the summary info. 138 */ 139 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 140 size = sblock.fs_cssize - i < sblock.fs_bsize ? 141 sblock.fs_cssize - i : sblock.fs_bsize; 142 sblock.fs_csp[j] = (struct csum *)calloc(1, (unsigned)size); 143 if (bread(&dfile, (char *)sblock.fs_csp[j], 144 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 145 size) != 0) 146 return (0); 147 } 148 /* 149 * allocate and initialize the necessary maps 150 */ 151 bmapsz = roundup(howmany(fmax, NBBY), sizeof(short)); 152 blockmap = calloc((unsigned)bmapsz, sizeof (char)); 153 if (blockmap == NULL) { 154 printf("cannot alloc %d bytes for blockmap\n", bmapsz); 155 goto badsb; 156 } 157 statemap = calloc((unsigned)(imax + 1), sizeof(char)); 158 if (statemap == NULL) { 159 printf("cannot alloc %d bytes for statemap\n", imax + 1); 160 goto badsb; 161 } 162 lncntp = (short *)calloc((unsigned)(imax + 1), sizeof(short)); 163 if (lncntp == NULL) { 164 printf("cannot alloc %d bytes for lncntp\n", 165 (imax + 1) * sizeof(short)); 166 goto badsb; 167 } 168 169 return (1); 170 171 badsb: 172 ckfini(); 173 return (0); 174 } 175 176 /* 177 * Read in the super block and its summary info. 178 */ 179 readsb(listerr) 180 int listerr; 181 { 182 BUFAREA asblk; 183 # define altsblock asblk.b_un.b_fs 184 daddr_t super = bflag ? bflag * DEV_BSIZE : SBOFF; 185 186 initbarea(&asblk); 187 dev_bsize = 1; 188 if (bread(&dfile, (char *)&sblock, super, (long)SBSIZE) != 0) 189 return (0); 190 sblk.b_bno = super; 191 sblk.b_size = SBSIZE; 192 /* 193 * run a few consistency checks of the super block 194 */ 195 if (sblock.fs_magic != FS_MAGIC) 196 { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); } 197 if (sblock.fs_ncg < 1) 198 { badsb(listerr, "NCG OUT OF RANGE"); return (0); } 199 if (sblock.fs_cpg < 1 || sblock.fs_cpg > MAXCPG) 200 { badsb(listerr, "CPG OUT OF RANGE"); return (0); } 201 if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl || 202 (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl) 203 { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); } 204 if (sblock.fs_sbsize > SBSIZE) 205 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } 206 /* 207 * Set all possible fields that could differ, then do check 208 * of whole super block against an alternate super block. 209 * When an alternate super-block is specified this check is skipped. 210 */ 211 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1); 212 sblk.b_bno = sblk.b_bno / dev_bsize; 213 if (bflag) 214 return (1); 215 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); 216 if (asblk.b_errs != NULL) 217 return (0); 218 altsblock.fs_fsbtodb = sblock.fs_fsbtodb; 219 altsblock.fs_link = sblock.fs_link; 220 altsblock.fs_rlink = sblock.fs_rlink; 221 altsblock.fs_time = sblock.fs_time; 222 altsblock.fs_cstotal = sblock.fs_cstotal; 223 altsblock.fs_cgrotor = sblock.fs_cgrotor; 224 altsblock.fs_fmod = sblock.fs_fmod; 225 altsblock.fs_clean = sblock.fs_clean; 226 altsblock.fs_ronly = sblock.fs_ronly; 227 altsblock.fs_flags = sblock.fs_flags; 228 altsblock.fs_maxcontig = sblock.fs_maxcontig; 229 altsblock.fs_minfree = sblock.fs_minfree; 230 altsblock.fs_optim = sblock.fs_optim; 231 altsblock.fs_rotdelay = sblock.fs_rotdelay; 232 altsblock.fs_maxbpg = sblock.fs_maxbpg; 233 altsblock.fs_npsect = sblock.fs_npsect; 234 altsblock.fs_interleave = sblock.fs_interleave; 235 bcopy((char *)sblock.fs_csp, (char *)altsblock.fs_csp, 236 sizeof sblock.fs_csp); 237 bcopy((char *)sblock.fs_fsmnt, (char *)altsblock.fs_fsmnt, 238 sizeof sblock.fs_fsmnt); 239 bcopy((char *)sblock.fs_sparecon, (char *)altsblock.fs_sparecon, 240 sizeof sblock.fs_sparecon); 241 if (bcmp((char *)&sblock, (char *)&altsblock, (int)sblock.fs_sbsize)) { 242 badsb(listerr, 243 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 244 return (0); 245 } 246 return (1); 247 # undef altsblock 248 } 249 250 badsb(listerr, s) 251 int listerr; 252 char *s; 253 { 254 255 if (!listerr) 256 return; 257 if (preen) 258 printf("%s: ", devname); 259 pfatal("BAD SUPER BLOCK: %s\n", s); 260 } 261 262 /* 263 * Calculate a prototype superblock based on information in the disk label. 264 * When done the cgsblock macro can be calculated and the fs_ncg field 265 * can be used. Do NOT attempt to use other macros without verifying that 266 * their needed information is available! 267 */ 268 calcsb(dev, devfd, fs) 269 char *dev; 270 int devfd; 271 register struct fs *fs; 272 { 273 register struct disklabel *lp; 274 register struct partition *pp; 275 register char *cp; 276 struct disklabel *getdisklabel(); 277 int i; 278 279 cp = index(dev, '\0') - 1; 280 if (cp == (char *)-1 || (*cp < 'a' || *cp > 'h') && !isdigit(*cp)) { 281 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 282 return (0); 283 } 284 lp = getdisklabel(dev, devfd); 285 if (isdigit(*cp)) 286 pp = &lp->d_partitions[0]; 287 else 288 pp = &lp->d_partitions[*cp - 'a']; 289 if (pp->p_fstype != FS_BSDFFS) { 290 pfatal("%s: NOT FORMATTED AS A BSD FILE SYSTEM (%s)\n", 291 dev, pp->p_fstype < FSMAXTYPES ? 292 fstypenames[pp->p_fstype] : "unknown"); 293 return (0); 294 } 295 bzero(fs, sizeof(struct fs)); 296 fs->fs_fsize = pp->p_fsize; 297 fs->fs_frag = pp->p_frag; 298 fs->fs_cpg = pp->p_cpg; 299 fs->fs_size = pp->p_size; 300 fs->fs_ntrak = lp->d_ntracks; 301 fs->fs_nsect = lp->d_nsectors; 302 fs->fs_spc = lp->d_secpercyl; 303 fs->fs_nspf = fs->fs_fsize / lp->d_secsize; 304 fs->fs_sblkno = roundup( 305 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 306 fs->fs_frag); 307 fs->fs_cgmask = 0xffffffff; 308 for (i = fs->fs_ntrak; i > 1; i >>= 1) 309 fs->fs_cgmask <<= 1; 310 if (!POWEROF2(fs->fs_ntrak)) 311 fs->fs_cgmask <<= 1; 312 fs->fs_cgoffset = roundup( 313 howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag); 314 fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs); 315 fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg); 316 for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1) 317 fs->fs_fsbtodb++; 318 return (1); 319 } 320 321 struct disklabel * 322 getdisklabel(s, fd) 323 char *s; 324 int fd; 325 { 326 static struct disklabel lab; 327 328 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 329 pwarn(""); 330 perror("ioctl (GDINFO)"); 331 errexit("%s: can't read disk label", s); 332 } 333 return (&lab); 334 } 335