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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)setup.c 8.10 (Berkeley) 5/9/95 34 * $FreeBSD: src/sbin/fsck/setup.c,v 1.17.2.4 2002/06/24 05:10:41 dillon Exp $ 35 * $DragonFly: src/sbin/fsck/setup.c,v 1.8 2007/05/20 20:29:01 dillon Exp $ 36 */ 37 38 #define DKTYPENAMES 39 #include <sys/param.h> 40 #include <sys/stat.h> 41 #include <sys/diskslice.h> 42 #include <sys/file.h> 43 44 #include <vfs/ufs/dinode.h> 45 #include <vfs/ufs/fs.h> 46 47 #include <ctype.h> 48 #include <err.h> 49 #include <errno.h> 50 #include <string.h> 51 52 #include "fsck.h" 53 54 struct bufarea asblk; 55 #define altsblock (*asblk.b_un.b_fs) 56 #define POWEROF2(num) (((num) & ((num) - 1)) == 0) 57 58 static void badsb(int listerr, char *s); 59 static int readsb(int listerr); 60 61 /* 62 * Read in a superblock finding an alternate if necessary. 63 * Return 1 if successful, 0 if unsuccessful, -1 if filesystem 64 * is already clean (preen mode only). 65 */ 66 int 67 setup(char *dev) 68 { 69 long cg, size, asked, i, j; 70 long skipclean, bmapsize; 71 off_t sizepb; 72 struct stat statb; 73 struct fs proto; 74 75 havesb = 0; 76 fswritefd = -1; 77 skipclean = fflag ? 0 : preen; 78 if (stat(dev, &statb) < 0) { 79 printf("Can't stat %s: %s\n", dev, strerror(errno)); 80 return (0); 81 } 82 if ((statb.st_mode & S_IFMT) != S_IFCHR && 83 (statb.st_mode & S_IFMT) != S_IFBLK) { 84 pfatal("%s is not a disk device", dev); 85 if (reply("CONTINUE") == 0) 86 return (0); 87 } 88 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 89 printf("Can't open %s: %s\n", dev, strerror(errno)); 90 return (0); 91 } 92 if (preen == 0) 93 printf("** %s", dev); 94 if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) { 95 fswritefd = -1; 96 if (preen) 97 pfatal("NO WRITE ACCESS"); 98 printf(" (NO WRITE)"); 99 } 100 if (preen == 0) 101 printf("\n"); 102 fsmodified = 0; 103 lfdir = 0; 104 initbarea(&sblk); 105 initbarea(&asblk); 106 sblk.b_un.b_buf = malloc(SBSIZE); 107 asblk.b_un.b_buf = malloc(SBSIZE); 108 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 109 errx(EEXIT, "cannot allocate space for superblock"); 110 111 /* 112 * Figure out the device block size and the sector size. The 113 * block size is updated by readsb() later on. 114 */ 115 { 116 struct partinfo pinfo; 117 118 if (ioctl(fsreadfd, DIOCGPART, &pinfo) == 0) { 119 dev_bsize = secsize = pinfo.media_blksize; 120 } else { 121 dev_bsize = secsize = DEV_BSIZE; 122 } 123 } 124 125 /* 126 * Read in the superblock, looking for alternates if necessary 127 */ 128 if (readsb(1) == 0) { 129 skipclean = 0; 130 if (bflag || preen) 131 return(0); 132 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 133 return (0); 134 bflag = 32; 135 if (readsb(0) == 0) { 136 printf( 137 "YOU MUST USE THE -b OPTION TO FSCK TO SPECIFY\n" 138 "THE LOCATION OF AN ALTERNATE SUPER-BLOCK TO\n" 139 "SUPPLY NEEDED INFORMATION; SEE fsck(8)."); 140 bflag = 0; 141 return(0); 142 } 143 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 144 bflag = 0; 145 } 146 if (skipclean && sblock.fs_clean) { 147 pwarn("FILESYSTEM CLEAN; SKIPPING CHECKS\n"); 148 return (-1); 149 } 150 maxfsblock = sblock.fs_size; 151 maxino = sblock.fs_ncg * sblock.fs_ipg; 152 /* 153 * Check and potentially fix certain fields in the super block. 154 */ 155 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) { 156 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 157 if (reply("SET TO DEFAULT") == 1) { 158 sblock.fs_optim = FS_OPTTIME; 159 sbdirty(); 160 } 161 } 162 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) { 163 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 164 sblock.fs_minfree); 165 if (reply("SET TO DEFAULT") == 1) { 166 sblock.fs_minfree = 10; 167 sbdirty(); 168 } 169 } 170 if (sblock.fs_interleave < 1 || 171 sblock.fs_interleave > sblock.fs_nsect) { 172 pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK", 173 sblock.fs_interleave); 174 sblock.fs_interleave = 1; 175 if (preen) 176 printf(" (FIXED)\n"); 177 if (preen || reply("SET TO DEFAULT") == 1) { 178 sbdirty(); 179 dirty(&asblk); 180 } 181 } 182 if (sblock.fs_npsect < sblock.fs_nsect || 183 sblock.fs_npsect > sblock.fs_nsect*2) { 184 pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK", 185 sblock.fs_npsect); 186 sblock.fs_npsect = sblock.fs_nsect; 187 if (preen) 188 printf(" (FIXED)\n"); 189 if (preen || reply("SET TO DEFAULT") == 1) { 190 sbdirty(); 191 dirty(&asblk); 192 } 193 } 194 if (sblock.fs_inodefmt >= FS_44INODEFMT) { 195 newinofmt = 1; 196 } else { 197 sblock.fs_qbmask = ~sblock.fs_bmask; 198 sblock.fs_qfmask = ~sblock.fs_fmask; 199 /* This should match the kernel limit in ffs_oldfscompat(). */ 200 sblock.fs_maxfilesize = (u_int64_t)1 << 39; 201 newinofmt = 0; 202 } 203 /* 204 * Convert to new inode format. 205 */ 206 if (cvtlevel >= 2 && sblock.fs_inodefmt < FS_44INODEFMT) { 207 if (preen) 208 pwarn("CONVERTING TO NEW INODE FORMAT\n"); 209 else if (!reply("CONVERT TO NEW INODE FORMAT")) 210 return(0); 211 doinglevel2++; 212 sblock.fs_inodefmt = FS_44INODEFMT; 213 sizepb = sblock.fs_bsize; 214 sblock.fs_maxfilesize = sblock.fs_bsize * NDADDR - 1; 215 for (i = 0; i < NIADDR; i++) { 216 sizepb *= NINDIR(&sblock); 217 sblock.fs_maxfilesize += sizepb; 218 } 219 sblock.fs_maxsymlinklen = MAXSYMLINKLEN; 220 sblock.fs_qbmask = ~sblock.fs_bmask; 221 sblock.fs_qfmask = ~sblock.fs_fmask; 222 sbdirty(); 223 dirty(&asblk); 224 } 225 /* 226 * Convert to new cylinder group format. 227 */ 228 if (cvtlevel >= 1 && sblock.fs_postblformat == FS_42POSTBLFMT) { 229 if (preen) 230 pwarn("CONVERTING TO NEW CYLINDER GROUP FORMAT\n"); 231 else if (!reply("CONVERT TO NEW CYLINDER GROUP FORMAT")) 232 return(0); 233 doinglevel1++; 234 sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT; 235 sblock.fs_nrpos = 8; 236 sblock.fs_postbloff = 237 (char *)(&sblock.fs_opostbl[0][0]) - 238 (char *)(&sblock.fs_firstfield); 239 sblock.fs_rotbloff = &sblock.fs_space[0] - 240 (u_char *)(&sblock.fs_firstfield); 241 sblock.fs_cgsize = 242 fragroundup(&sblock, CGSIZE(&sblock)); 243 sbdirty(); 244 dirty(&asblk); 245 } 246 if (asblk.b_dirty && !bflag) { 247 memmove(&altsblock, &sblock, (size_t)sblock.fs_sbsize); 248 flush(fswritefd, &asblk); 249 } 250 /* 251 * read in the summary info. 252 */ 253 asked = 0; 254 sblock.fs_csp = calloc(1, sblock.fs_cssize); 255 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 256 size = sblock.fs_cssize - i < sblock.fs_bsize ? 257 sblock.fs_cssize - i : sblock.fs_bsize; 258 if (bread(fsreadfd, (char *)sblock.fs_csp + i, 259 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 260 size) != 0 && !asked) { 261 pfatal("BAD SUMMARY INFORMATION"); 262 if (reply("CONTINUE") == 0) { 263 ckfini(0); 264 exit(EEXIT); 265 } 266 asked++; 267 } 268 } 269 /* 270 * allocate and initialize the necessary maps 271 */ 272 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(short)); 273 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 274 if (blockmap == NULL) { 275 printf("cannot alloc %u bytes for blockmap\n", 276 (unsigned)bmapsize); 277 goto badsb; 278 } 279 inostathead = calloc((unsigned)(sblock.fs_ncg), 280 sizeof(struct inostatlist)); 281 if (inostathead == NULL) { 282 printf("cannot alloc %u bytes for inostathead\n", 283 (unsigned)(sizeof(struct inostatlist) * (sblock.fs_ncg))); 284 goto badsb; 285 } 286 numdirs = sblock.fs_cstotal.cs_ndir; 287 288 /* 289 * Calculate the directory hash table size. Do not allocate 290 * a ridiculous amount of memory if we have a lot of directories. 291 */ 292 for (dirhash = 16; dirhash < numdirs; dirhash <<= 1) 293 ; 294 if (dirhash > 1024*1024) 295 dirhash /= 8; 296 dirhashmask = dirhash - 1; 297 298 if (numdirs == 0) { 299 printf("numdirs is zero, try using an alternate superblock\n"); 300 goto badsb; 301 } 302 inplast = 0; 303 listmax = numdirs + 10; 304 inpsort = calloc((unsigned)listmax, sizeof(struct inoinfo *)); 305 inphead = calloc((unsigned)dirhash, sizeof(struct inoinfo *)); 306 if (inpsort == NULL || inphead == NULL) { 307 printf("cannot allocate base structures for %ld directories\n", 308 numdirs); 309 goto badsb; 310 } 311 bufinit(); 312 if (sblock.fs_flags & FS_DOSOFTDEP) 313 usedsoftdep = 1; 314 else 315 usedsoftdep = 0; 316 return (1); 317 318 badsb: 319 ckfini(0); 320 return (0); 321 } 322 323 /* 324 * Read in the super block and its summary info. 325 */ 326 static int 327 readsb(int listerr) 328 { 329 ufs_daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 330 331 if (bread(fsreadfd, (char *)&sblock, super, (long)SBSIZE) != 0) 332 return (0); 333 sblk.b_bno = super; 334 sblk.b_size = SBSIZE; 335 /* 336 * run a few consistency checks of the super block 337 */ 338 if (sblock.fs_magic != FS_MAGIC) 339 { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); } 340 if (sblock.fs_ncg < 1) 341 { badsb(listerr, "NCG OUT OF RANGE"); return (0); } 342 if (sblock.fs_cpg < 1) 343 { badsb(listerr, "CPG OUT OF RANGE"); return (0); } 344 if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl || 345 (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl) 346 { badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); } 347 if (sblock.fs_sbsize > SBSIZE) 348 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } 349 /* 350 * Compute block size that the filesystem is based on, 351 * according to fsbtodb, and adjust superblock block number 352 * so we can tell if this is an alternate later. 353 */ 354 super *= dev_bsize; 355 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1); 356 sblk.b_bno = super / dev_bsize; 357 if (bflag) { 358 havesb = 1; 359 return (1); 360 } 361 /* 362 * Compare all fields that should not differ in alternate super block. 363 * When an alternate super-block is specified this check is skipped. 364 */ 365 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); 366 if (asblk.b_errs) 367 return (0); 368 if (altsblock.fs_sblkno != sblock.fs_sblkno || 369 altsblock.fs_cblkno != sblock.fs_cblkno || 370 altsblock.fs_iblkno != sblock.fs_iblkno || 371 altsblock.fs_dblkno != sblock.fs_dblkno || 372 altsblock.fs_cgoffset != sblock.fs_cgoffset || 373 altsblock.fs_cgmask != sblock.fs_cgmask || 374 altsblock.fs_ncg != sblock.fs_ncg || 375 altsblock.fs_bsize != sblock.fs_bsize || 376 altsblock.fs_fsize != sblock.fs_fsize || 377 altsblock.fs_frag != sblock.fs_frag || 378 altsblock.fs_bmask != sblock.fs_bmask || 379 altsblock.fs_fmask != sblock.fs_fmask || 380 altsblock.fs_bshift != sblock.fs_bshift || 381 altsblock.fs_fshift != sblock.fs_fshift || 382 altsblock.fs_fragshift != sblock.fs_fragshift || 383 altsblock.fs_fsbtodb != sblock.fs_fsbtodb || 384 altsblock.fs_sbsize != sblock.fs_sbsize || 385 altsblock.fs_nindir != sblock.fs_nindir || 386 altsblock.fs_inopb != sblock.fs_inopb || 387 altsblock.fs_cssize != sblock.fs_cssize || 388 altsblock.fs_cpg != sblock.fs_cpg || 389 altsblock.fs_ipg != sblock.fs_ipg || 390 altsblock.fs_fpg != sblock.fs_fpg || 391 altsblock.fs_magic != sblock.fs_magic) { 392 badsb(listerr, 393 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 394 return (0); 395 } 396 havesb = 1; 397 return (1); 398 } 399 400 static void 401 badsb(int listerr, char *s) 402 { 403 404 if (!listerr) 405 return; 406 if (preen) 407 printf("%s: ", cdevname); 408 pfatal("BAD SUPER BLOCK: %s\n", s); 409 } 410 411