1 /* 2 * Copyright (c) 1980, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)setup.c 8.10 (Berkeley) 5/9/95 30 * $FreeBSD: src/sbin/fsck/setup.c,v 1.17.2.4 2002/06/24 05:10:41 dillon Exp $ 31 */ 32 33 #define DKTYPENAMES 34 #include <sys/param.h> 35 #include <sys/stat.h> 36 #include <sys/diskslice.h> 37 #include <sys/file.h> 38 39 #include <vfs/ufs/dinode.h> 40 #include <vfs/ufs/fs.h> 41 42 #include <ctype.h> 43 #include <err.h> 44 #include <errno.h> 45 #include <string.h> 46 47 #include "fsck.h" 48 49 struct bufarea asblk; 50 #define altsblock (*asblk.b_un.b_fs) 51 #define POWEROF2(num) (((num) & ((num) - 1)) == 0) 52 53 static void badsb(int listerr, char *s); 54 static int readsb(int listerr); 55 56 /* 57 * Read in a superblock finding an alternate if necessary. 58 * Return 1 if successful, 0 if unsuccessful, -1 if filesystem 59 * is already clean (preen mode only). 60 */ 61 int 62 setup(char *dev) 63 { 64 long size, asked, i, j; 65 long skipclean, bmapsize; 66 off_t sizepb; 67 struct stat statb; 68 69 havesb = 0; 70 fswritefd = -1; 71 skipclean = fflag ? 0 : preen; 72 if (stat(dev, &statb) < 0) { 73 printf("Can't stat %s: %s\n", dev, strerror(errno)); 74 return (0); 75 } 76 if ((statb.st_mode & S_IFMT) != S_IFCHR && 77 (statb.st_mode & S_IFMT) != S_IFBLK) { 78 pfatal("%s is not a disk device", dev); 79 if (reply("CONTINUE") == 0) 80 return (0); 81 } 82 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 83 printf("Can't open %s: %s\n", dev, strerror(errno)); 84 return (0); 85 } 86 if (preen == 0) 87 printf("** %s", dev); 88 if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) { 89 fswritefd = -1; 90 if (preen) 91 pfatal("NO WRITE ACCESS"); 92 printf(" (NO WRITE)"); 93 } 94 if (preen == 0) 95 printf("\n"); 96 fsmodified = 0; 97 lfdir = 0; 98 initbarea(&sblk); 99 initbarea(&asblk); 100 sblk.b_un.b_buf = malloc(SBSIZE); 101 asblk.b_un.b_buf = malloc(SBSIZE); 102 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 103 errx(EEXIT, "cannot allocate space for superblock"); 104 105 /* 106 * Figure out the device block size and the sector size. The 107 * block size is updated by readsb() later on. 108 */ 109 { 110 struct partinfo pinfo; 111 112 if (ioctl(fsreadfd, DIOCGPART, &pinfo) == 0) { 113 dev_bsize = secsize = pinfo.media_blksize; 114 } else { 115 dev_bsize = secsize = DEV_BSIZE; 116 } 117 } 118 119 /* 120 * Read in the superblock, looking for alternates if necessary 121 */ 122 if (readsb(1) == 0) { 123 skipclean = 0; 124 if (bflag || preen) 125 return(0); 126 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 127 return (0); 128 bflag = 32; 129 if (readsb(0) == 0) { 130 printf( 131 "YOU MUST USE THE -b OPTION TO FSCK TO SPECIFY\n" 132 "THE LOCATION OF AN ALTERNATE SUPER-BLOCK TO\n" 133 "SUPPLY NEEDED INFORMATION; SEE fsck(8)."); 134 bflag = 0; 135 return(0); 136 } 137 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 138 bflag = 0; 139 } 140 if (skipclean && sblock.fs_clean) { 141 pwarn("FILESYSTEM CLEAN; SKIPPING CHECKS\n"); 142 return (-1); 143 } 144 maxfsblock = sblock.fs_size; 145 maxino = sblock.fs_ncg * sblock.fs_ipg; 146 /* 147 * Check and potentially fix certain fields in the super block. 148 */ 149 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) { 150 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 151 if (reply("SET TO DEFAULT") == 1) { 152 sblock.fs_optim = FS_OPTTIME; 153 sbdirty(); 154 } 155 } 156 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) { 157 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 158 sblock.fs_minfree); 159 if (reply("SET TO DEFAULT") == 1) { 160 sblock.fs_minfree = 10; 161 sbdirty(); 162 } 163 } 164 if (sblock.fs_interleave < 1 || 165 sblock.fs_interleave > sblock.fs_nsect) { 166 pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK", 167 sblock.fs_interleave); 168 sblock.fs_interleave = 1; 169 if (preen) 170 printf(" (FIXED)\n"); 171 if (preen || reply("SET TO DEFAULT") == 1) { 172 sbdirty(); 173 dirty(&asblk); 174 } 175 } 176 if (sblock.fs_npsect < sblock.fs_nsect || 177 sblock.fs_npsect > sblock.fs_nsect*2) { 178 pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", 179 sblock.fs_npsect); 180 sblock.fs_npsect = sblock.fs_nsect; 181 if (preen) 182 printf(" (FIXED)\n"); 183 if (preen || reply("SET TO DEFAULT") == 1) { 184 sbdirty(); 185 dirty(&asblk); 186 } 187 } 188 if (sblock.fs_inodefmt >= FS_44INODEFMT) { 189 newinofmt = 1; 190 } else { 191 sblock.fs_qbmask = ~sblock.fs_bmask; 192 sblock.fs_qfmask = ~sblock.fs_fmask; 193 /* This should match the kernel limit in ffs_oldfscompat(). */ 194 sblock.fs_maxfilesize = (u_int64_t)1 << 39; 195 newinofmt = 0; 196 } 197 /* 198 * Convert to new inode format. 199 */ 200 if (cvtlevel >= 2 && sblock.fs_inodefmt < FS_44INODEFMT) { 201 if (preen) 202 pwarn("CONVERTING TO NEW INODE FORMAT\n"); 203 else if (!reply("CONVERT TO NEW INODE FORMAT")) 204 return(0); 205 doinglevel2++; 206 sblock.fs_inodefmt = FS_44INODEFMT; 207 sizepb = sblock.fs_bsize; 208 sblock.fs_maxfilesize = sblock.fs_bsize * UFS_NDADDR - 1; 209 for (i = 0; i < UFS_NIADDR; i++) { 210 sizepb *= NINDIR(&sblock); 211 sblock.fs_maxfilesize += sizepb; 212 } 213 sblock.fs_maxsymlinklen = UFS1_MAXSYMLINKLEN; 214 sblock.fs_qbmask = ~sblock.fs_bmask; 215 sblock.fs_qfmask = ~sblock.fs_fmask; 216 sbdirty(); 217 dirty(&asblk); 218 } 219 /* 220 * Convert to new cylinder group format. 221 */ 222 if (cvtlevel >= 1 && sblock.fs_postblformat == FS_42POSTBLFMT) { 223 if (preen) 224 pwarn("CONVERTING TO NEW CYLINDER GROUP FORMAT\n"); 225 else if (!reply("CONVERT TO NEW CYLINDER GROUP FORMAT")) 226 return(0); 227 doinglevel1++; 228 sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT; 229 sblock.fs_nrpos = 8; 230 sblock.fs_postbloff = 231 (char *)(&sblock.fs_opostbl[0][0]) - 232 (char *)(&sblock.fs_firstfield); 233 sblock.fs_rotbloff = &sblock.fs_space[0] - 234 (u_char *)(&sblock.fs_firstfield); 235 sblock.fs_cgsize = 236 fragroundup(&sblock, CGSIZE(&sblock)); 237 sbdirty(); 238 dirty(&asblk); 239 } 240 if (asblk.b_dirty && !bflag) { 241 memmove(&altsblock, &sblock, (size_t)sblock.fs_sbsize); 242 flush(fswritefd, &asblk); 243 } 244 /* 245 * read in the summary info. 246 */ 247 asked = 0; 248 sblock.fs_csp = calloc(1, sblock.fs_cssize); 249 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 250 size = sblock.fs_cssize - i < sblock.fs_bsize ? 251 sblock.fs_cssize - i : sblock.fs_bsize; 252 if (bread(fsreadfd, (char *)sblock.fs_csp + i, 253 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 254 size) != 0 && !asked) { 255 pfatal("BAD SUMMARY INFORMATION"); 256 if (reply("CONTINUE") == 0) { 257 ckfini(0); 258 exit(EEXIT); 259 } 260 asked++; 261 } 262 } 263 /* 264 * allocate and initialize the necessary maps 265 */ 266 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(short)); 267 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 268 if (blockmap == NULL) { 269 printf("cannot alloc %u bytes for blockmap\n", 270 (unsigned)bmapsize); 271 goto badsb; 272 } 273 inostathead = calloc((unsigned)(sblock.fs_ncg), 274 sizeof(struct inostatlist)); 275 if (inostathead == NULL) { 276 printf("cannot alloc %u bytes for inostathead\n", 277 (unsigned)(sizeof(struct inostatlist) * (sblock.fs_ncg))); 278 goto badsb; 279 } 280 numdirs = sblock.fs_cstotal.cs_ndir; 281 282 /* 283 * Calculate the directory hash table size. Do not allocate 284 * a ridiculous amount of memory if we have a lot of directories. 285 */ 286 for (dirhash = 16; dirhash < numdirs; dirhash <<= 1) 287 ; 288 if (dirhash > 1024*1024) 289 dirhash /= 8; 290 dirhashmask = dirhash - 1; 291 292 if (numdirs == 0) { 293 printf("numdirs is zero, try using an alternate superblock\n"); 294 goto badsb; 295 } 296 inplast = 0; 297 listmax = numdirs + 10; 298 inpsort = calloc((unsigned)listmax, sizeof(struct inoinfo *)); 299 inphead = calloc((unsigned)dirhash, sizeof(struct inoinfo *)); 300 if (inpsort == NULL || inphead == NULL) { 301 printf("cannot allocate base structures for %ld directories\n", 302 numdirs); 303 goto badsb; 304 } 305 bufinit(); 306 if (sblock.fs_flags & FS_DOSOFTDEP) 307 usedsoftdep = 1; 308 else 309 usedsoftdep = 0; 310 return (1); 311 312 badsb: 313 ckfini(0); 314 return (0); 315 } 316 317 /* 318 * Read in the super block and its summary info. 319 */ 320 static int 321 readsb(int listerr) 322 { 323 ufs_daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 324 325 if (bread(fsreadfd, (char *)&sblock, super, (long)SBSIZE) != 0) 326 return (0); 327 sblk.b_bno = super; 328 sblk.b_size = SBSIZE; 329 /* 330 * run a few consistency checks of the super block 331 */ 332 if (sblock.fs_magic != FS_MAGIC) 333 { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); } 334 if (sblock.fs_ncg < 1) 335 { badsb(listerr, "NCG OUT OF RANGE"); return (0); } 336 if (sblock.fs_cpg < 1) 337 { badsb(listerr, "CPG OUT OF RANGE"); return (0); } 338 if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl || 339 (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl) 340 { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); } 341 if (sblock.fs_sbsize > SBSIZE) 342 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } 343 /* 344 * Compute block size that the filesystem is based on, 345 * according to fsbtodb, and adjust superblock block number 346 * so we can tell if this is an alternate later. 347 */ 348 super *= dev_bsize; 349 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1); 350 sblk.b_bno = super / dev_bsize; 351 if (bflag) { 352 havesb = 1; 353 return (1); 354 } 355 /* 356 * Compare all fields that should not differ in alternate super block. 357 * When an alternate super-block is specified this check is skipped. 358 */ 359 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); 360 if (asblk.b_errs) 361 return (0); 362 if (altsblock.fs_sblkno != sblock.fs_sblkno || 363 altsblock.fs_cblkno != sblock.fs_cblkno || 364 altsblock.fs_iblkno != sblock.fs_iblkno || 365 altsblock.fs_dblkno != sblock.fs_dblkno || 366 altsblock.fs_cgoffset != sblock.fs_cgoffset || 367 altsblock.fs_cgmask != sblock.fs_cgmask || 368 altsblock.fs_ncg != sblock.fs_ncg || 369 altsblock.fs_bsize != sblock.fs_bsize || 370 altsblock.fs_fsize != sblock.fs_fsize || 371 altsblock.fs_frag != sblock.fs_frag || 372 altsblock.fs_bmask != sblock.fs_bmask || 373 altsblock.fs_fmask != sblock.fs_fmask || 374 altsblock.fs_bshift != sblock.fs_bshift || 375 altsblock.fs_fshift != sblock.fs_fshift || 376 altsblock.fs_fragshift != sblock.fs_fragshift || 377 altsblock.fs_fsbtodb != sblock.fs_fsbtodb || 378 altsblock.fs_sbsize != sblock.fs_sbsize || 379 altsblock.fs_nindir != sblock.fs_nindir || 380 altsblock.fs_inopb != sblock.fs_inopb || 381 altsblock.fs_cssize != sblock.fs_cssize || 382 altsblock.fs_cpg != sblock.fs_cpg || 383 altsblock.fs_ipg != sblock.fs_ipg || 384 altsblock.fs_fpg != sblock.fs_fpg || 385 altsblock.fs_magic != sblock.fs_magic) { 386 badsb(listerr, 387 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 388 return (0); 389 } 390 havesb = 1; 391 return (1); 392 } 393 394 static void 395 badsb(int listerr, char *s) 396 { 397 398 if (!listerr) 399 return; 400 if (preen) 401 printf("%s: ", cdevname); 402 pfatal("BAD SUPER BLOCK: %s\n", s); 403 } 404 405