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 * $DragonFly: src/sbin/fsck/setup.c,v 1.8 2007/05/20 20:29:01 dillon Exp $ 32 */ 33 34 #define DKTYPENAMES 35 #include <sys/param.h> 36 #include <sys/stat.h> 37 #include <sys/diskslice.h> 38 #include <sys/file.h> 39 40 #include <vfs/ufs/dinode.h> 41 #include <vfs/ufs/fs.h> 42 43 #include <ctype.h> 44 #include <err.h> 45 #include <errno.h> 46 #include <string.h> 47 48 #include "fsck.h" 49 50 struct bufarea asblk; 51 #define altsblock (*asblk.b_un.b_fs) 52 #define POWEROF2(num) (((num) & ((num) - 1)) == 0) 53 54 static void badsb(int listerr, char *s); 55 static int readsb(int listerr); 56 57 /* 58 * Read in a superblock finding an alternate if necessary. 59 * Return 1 if successful, 0 if unsuccessful, -1 if filesystem 60 * is already clean (preen mode only). 61 */ 62 int 63 setup(char *dev) 64 { 65 long cg, size, asked, i, j; 66 long skipclean, bmapsize; 67 off_t sizepb; 68 struct stat statb; 69 struct fs proto; 70 71 havesb = 0; 72 fswritefd = -1; 73 skipclean = fflag ? 0 : preen; 74 if (stat(dev, &statb) < 0) { 75 printf("Can't stat %s: %s\n", dev, strerror(errno)); 76 return (0); 77 } 78 if ((statb.st_mode & S_IFMT) != S_IFCHR && 79 (statb.st_mode & S_IFMT) != S_IFBLK) { 80 pfatal("%s is not a disk device", dev); 81 if (reply("CONTINUE") == 0) 82 return (0); 83 } 84 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 85 printf("Can't open %s: %s\n", dev, strerror(errno)); 86 return (0); 87 } 88 if (preen == 0) 89 printf("** %s", dev); 90 if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) { 91 fswritefd = -1; 92 if (preen) 93 pfatal("NO WRITE ACCESS"); 94 printf(" (NO WRITE)"); 95 } 96 if (preen == 0) 97 printf("\n"); 98 fsmodified = 0; 99 lfdir = 0; 100 initbarea(&sblk); 101 initbarea(&asblk); 102 sblk.b_un.b_buf = malloc(SBSIZE); 103 asblk.b_un.b_buf = malloc(SBSIZE); 104 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 105 errx(EEXIT, "cannot allocate space for superblock"); 106 107 /* 108 * Figure out the device block size and the sector size. The 109 * block size is updated by readsb() later on. 110 */ 111 { 112 struct partinfo pinfo; 113 114 if (ioctl(fsreadfd, DIOCGPART, &pinfo) == 0) { 115 dev_bsize = secsize = pinfo.media_blksize; 116 } else { 117 dev_bsize = secsize = DEV_BSIZE; 118 } 119 } 120 121 /* 122 * Read in the superblock, looking for alternates if necessary 123 */ 124 if (readsb(1) == 0) { 125 skipclean = 0; 126 if (bflag || preen) 127 return(0); 128 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 129 return (0); 130 bflag = 32; 131 if (readsb(0) == 0) { 132 printf( 133 "YOU MUST USE THE -b OPTION TO FSCK TO SPECIFY\n" 134 "THE LOCATION OF AN ALTERNATE SUPER-BLOCK TO\n" 135 "SUPPLY NEEDED INFORMATION; SEE fsck(8)."); 136 bflag = 0; 137 return(0); 138 } 139 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 140 bflag = 0; 141 } 142 if (skipclean && sblock.fs_clean) { 143 pwarn("FILESYSTEM CLEAN; SKIPPING CHECKS\n"); 144 return (-1); 145 } 146 maxfsblock = sblock.fs_size; 147 maxino = sblock.fs_ncg * sblock.fs_ipg; 148 /* 149 * Check and potentially fix certain fields in the super block. 150 */ 151 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) { 152 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 153 if (reply("SET TO DEFAULT") == 1) { 154 sblock.fs_optim = FS_OPTTIME; 155 sbdirty(); 156 } 157 } 158 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) { 159 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 160 sblock.fs_minfree); 161 if (reply("SET TO DEFAULT") == 1) { 162 sblock.fs_minfree = 10; 163 sbdirty(); 164 } 165 } 166 if (sblock.fs_interleave < 1 || 167 sblock.fs_interleave > sblock.fs_nsect) { 168 pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK", 169 sblock.fs_interleave); 170 sblock.fs_interleave = 1; 171 if (preen) 172 printf(" (FIXED)\n"); 173 if (preen || reply("SET TO DEFAULT") == 1) { 174 sbdirty(); 175 dirty(&asblk); 176 } 177 } 178 if (sblock.fs_npsect < sblock.fs_nsect || 179 sblock.fs_npsect > sblock.fs_nsect*2) { 180 pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", 181 sblock.fs_npsect); 182 sblock.fs_npsect = sblock.fs_nsect; 183 if (preen) 184 printf(" (FIXED)\n"); 185 if (preen || reply("SET TO DEFAULT") == 1) { 186 sbdirty(); 187 dirty(&asblk); 188 } 189 } 190 if (sblock.fs_inodefmt >= FS_44INODEFMT) { 191 newinofmt = 1; 192 } else { 193 sblock.fs_qbmask = ~sblock.fs_bmask; 194 sblock.fs_qfmask = ~sblock.fs_fmask; 195 /* This should match the kernel limit in ffs_oldfscompat(). */ 196 sblock.fs_maxfilesize = (u_int64_t)1 << 39; 197 newinofmt = 0; 198 } 199 /* 200 * Convert to new inode format. 201 */ 202 if (cvtlevel >= 2 && sblock.fs_inodefmt < FS_44INODEFMT) { 203 if (preen) 204 pwarn("CONVERTING TO NEW INODE FORMAT\n"); 205 else if (!reply("CONVERT TO NEW INODE FORMAT")) 206 return(0); 207 doinglevel2++; 208 sblock.fs_inodefmt = FS_44INODEFMT; 209 sizepb = sblock.fs_bsize; 210 sblock.fs_maxfilesize = sblock.fs_bsize * NDADDR - 1; 211 for (i = 0; i < NIADDR; i++) { 212 sizepb *= NINDIR(&sblock); 213 sblock.fs_maxfilesize += sizepb; 214 } 215 sblock.fs_maxsymlinklen = MAXSYMLINKLEN; 216 sblock.fs_qbmask = ~sblock.fs_bmask; 217 sblock.fs_qfmask = ~sblock.fs_fmask; 218 sbdirty(); 219 dirty(&asblk); 220 } 221 /* 222 * Convert to new cylinder group format. 223 */ 224 if (cvtlevel >= 1 && sblock.fs_postblformat == FS_42POSTBLFMT) { 225 if (preen) 226 pwarn("CONVERTING TO NEW CYLINDER GROUP FORMAT\n"); 227 else if (!reply("CONVERT TO NEW CYLINDER GROUP FORMAT")) 228 return(0); 229 doinglevel1++; 230 sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT; 231 sblock.fs_nrpos = 8; 232 sblock.fs_postbloff = 233 (char *)(&sblock.fs_opostbl[0][0]) - 234 (char *)(&sblock.fs_firstfield); 235 sblock.fs_rotbloff = &sblock.fs_space[0] - 236 (u_char *)(&sblock.fs_firstfield); 237 sblock.fs_cgsize = 238 fragroundup(&sblock, CGSIZE(&sblock)); 239 sbdirty(); 240 dirty(&asblk); 241 } 242 if (asblk.b_dirty && !bflag) { 243 memmove(&altsblock, &sblock, (size_t)sblock.fs_sbsize); 244 flush(fswritefd, &asblk); 245 } 246 /* 247 * read in the summary info. 248 */ 249 asked = 0; 250 sblock.fs_csp = calloc(1, sblock.fs_cssize); 251 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 252 size = sblock.fs_cssize - i < sblock.fs_bsize ? 253 sblock.fs_cssize - i : sblock.fs_bsize; 254 if (bread(fsreadfd, (char *)sblock.fs_csp + i, 255 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 256 size) != 0 && !asked) { 257 pfatal("BAD SUMMARY INFORMATION"); 258 if (reply("CONTINUE") == 0) { 259 ckfini(0); 260 exit(EEXIT); 261 } 262 asked++; 263 } 264 } 265 /* 266 * allocate and initialize the necessary maps 267 */ 268 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(short)); 269 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 270 if (blockmap == NULL) { 271 printf("cannot alloc %u bytes for blockmap\n", 272 (unsigned)bmapsize); 273 goto badsb; 274 } 275 inostathead = calloc((unsigned)(sblock.fs_ncg), 276 sizeof(struct inostatlist)); 277 if (inostathead == NULL) { 278 printf("cannot alloc %u bytes for inostathead\n", 279 (unsigned)(sizeof(struct inostatlist) * (sblock.fs_ncg))); 280 goto badsb; 281 } 282 numdirs = sblock.fs_cstotal.cs_ndir; 283 284 /* 285 * Calculate the directory hash table size. Do not allocate 286 * a ridiculous amount of memory if we have a lot of directories. 287 */ 288 for (dirhash = 16; dirhash < numdirs; dirhash <<= 1) 289 ; 290 if (dirhash > 1024*1024) 291 dirhash /= 8; 292 dirhashmask = dirhash - 1; 293 294 if (numdirs == 0) { 295 printf("numdirs is zero, try using an alternate superblock\n"); 296 goto badsb; 297 } 298 inplast = 0; 299 listmax = numdirs + 10; 300 inpsort = calloc((unsigned)listmax, sizeof(struct inoinfo *)); 301 inphead = calloc((unsigned)dirhash, sizeof(struct inoinfo *)); 302 if (inpsort == NULL || inphead == NULL) { 303 printf("cannot allocate base structures for %ld directories\n", 304 numdirs); 305 goto badsb; 306 } 307 bufinit(); 308 if (sblock.fs_flags & FS_DOSOFTDEP) 309 usedsoftdep = 1; 310 else 311 usedsoftdep = 0; 312 return (1); 313 314 badsb: 315 ckfini(0); 316 return (0); 317 } 318 319 /* 320 * Read in the super block and its summary info. 321 */ 322 static int 323 readsb(int listerr) 324 { 325 ufs_daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 326 327 if (bread(fsreadfd, (char *)&sblock, super, (long)SBSIZE) != 0) 328 return (0); 329 sblk.b_bno = super; 330 sblk.b_size = SBSIZE; 331 /* 332 * run a few consistency checks of the super block 333 */ 334 if (sblock.fs_magic != FS_MAGIC) 335 { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); } 336 if (sblock.fs_ncg < 1) 337 { badsb(listerr, "NCG OUT OF RANGE"); return (0); } 338 if (sblock.fs_cpg < 1) 339 { badsb(listerr, "CPG OUT OF RANGE"); return (0); } 340 if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl || 341 (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl) 342 { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); } 343 if (sblock.fs_sbsize > SBSIZE) 344 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } 345 /* 346 * Compute block size that the filesystem is based on, 347 * according to fsbtodb, and adjust superblock block number 348 * so we can tell if this is an alternate later. 349 */ 350 super *= dev_bsize; 351 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1); 352 sblk.b_bno = super / dev_bsize; 353 if (bflag) { 354 havesb = 1; 355 return (1); 356 } 357 /* 358 * Compare all fields that should not differ in alternate super block. 359 * When an alternate super-block is specified this check is skipped. 360 */ 361 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); 362 if (asblk.b_errs) 363 return (0); 364 if (altsblock.fs_sblkno != sblock.fs_sblkno || 365 altsblock.fs_cblkno != sblock.fs_cblkno || 366 altsblock.fs_iblkno != sblock.fs_iblkno || 367 altsblock.fs_dblkno != sblock.fs_dblkno || 368 altsblock.fs_cgoffset != sblock.fs_cgoffset || 369 altsblock.fs_cgmask != sblock.fs_cgmask || 370 altsblock.fs_ncg != sblock.fs_ncg || 371 altsblock.fs_bsize != sblock.fs_bsize || 372 altsblock.fs_fsize != sblock.fs_fsize || 373 altsblock.fs_frag != sblock.fs_frag || 374 altsblock.fs_bmask != sblock.fs_bmask || 375 altsblock.fs_fmask != sblock.fs_fmask || 376 altsblock.fs_bshift != sblock.fs_bshift || 377 altsblock.fs_fshift != sblock.fs_fshift || 378 altsblock.fs_fragshift != sblock.fs_fragshift || 379 altsblock.fs_fsbtodb != sblock.fs_fsbtodb || 380 altsblock.fs_sbsize != sblock.fs_sbsize || 381 altsblock.fs_nindir != sblock.fs_nindir || 382 altsblock.fs_inopb != sblock.fs_inopb || 383 altsblock.fs_cssize != sblock.fs_cssize || 384 altsblock.fs_cpg != sblock.fs_cpg || 385 altsblock.fs_ipg != sblock.fs_ipg || 386 altsblock.fs_fpg != sblock.fs_fpg || 387 altsblock.fs_magic != sblock.fs_magic) { 388 badsb(listerr, 389 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 390 return (0); 391 } 392 havesb = 1; 393 return (1); 394 } 395 396 static void 397 badsb(int listerr, char *s) 398 { 399 400 if (!listerr) 401 return; 402 if (preen) 403 printf("%s: ", cdevname); 404 pfatal("BAD SUPER BLOCK: %s\n", s); 405 } 406 407