setup.c revision 96483
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 34#ifndef lint 35#if 0 36static const char sccsid[] = "@(#)setup.c 8.10 (Berkeley) 5/9/95"; 37#endif 38static const char rcsid[] = 39 "$FreeBSD: head/sbin/fsck_ffs/setup.c 96483 2002-05-12 23:44:15Z phk $"; 40#endif /* not lint */ 41 42#define DKTYPENAMES 43#include <sys/param.h> 44#include <sys/stat.h> 45#include <sys/disklabel.h> 46#include <sys/file.h> 47#include <sys/sysctl.h> 48 49#include <ufs/ufs/dinode.h> 50#include <ufs/ffs/fs.h> 51 52#include <ctype.h> 53#include <err.h> 54#include <errno.h> 55#include <string.h> 56 57#include "fsck.h" 58 59struct bufarea asblk; 60#define altsblock (*asblk.b_un.b_fs) 61#define POWEROF2(num) (((num) & ((num) - 1)) == 0) 62 63static void badsb(int listerr, char *s); 64static int calcsb(char *dev, int devfd, struct fs *fs); 65static struct disklabel *getdisklabel(char *s, int fd); 66 67/* 68 * Read in a superblock finding an alternate if necessary. 69 * Return 1 if successful, 0 if unsuccessful, -1 if filesystem 70 * is already clean (preen mode only). 71 */ 72int 73setup(char *dev) 74{ 75 long cg, asked, i, j; 76 long bmapsize; 77 off_t sizepb; 78 struct stat statb; 79 struct fs proto; 80 size_t size; 81 82 havesb = 0; 83 fswritefd = -1; 84 cursnapshot = 0; 85 if (stat(dev, &statb) < 0) { 86 printf("Can't stat %s: %s\n", dev, strerror(errno)); 87 if (bkgrdflag) { 88 unlink(snapname); 89 bkgrdflag = 0; 90 } 91 return (0); 92 } 93 if ((statb.st_mode & S_IFMT) != S_IFCHR && 94 (statb.st_mode & S_IFMT) != S_IFBLK) { 95 if (bkgrdflag != 0 && (statb.st_flags & SF_SNAPSHOT) == 0) { 96 unlink(snapname); 97 printf("background fsck lacks a snapshot\n"); 98 exit(EEXIT); 99 } 100 if ((statb.st_flags & SF_SNAPSHOT) != 0 && cvtlevel == 0) { 101 cursnapshot = statb.st_ino; 102 } else { 103 if (cvtlevel == 0 || 104 (statb.st_flags & SF_SNAPSHOT) == 0) { 105 if (preen && bkgrdflag) { 106 unlink(snapname); 107 bkgrdflag = 0; 108 } 109 pfatal("%s is not a disk device", dev); 110 if (reply("CONTINUE") == 0) { 111 if (bkgrdflag) { 112 unlink(snapname); 113 bkgrdflag = 0; 114 } 115 return (0); 116 } 117 } else { 118 if (bkgrdflag) { 119 unlink(snapname); 120 bkgrdflag = 0; 121 } 122 pfatal("cannot convert a snapshot"); 123 exit(EEXIT); 124 } 125 } 126 } 127 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 128 if (bkgrdflag) { 129 unlink(snapname); 130 bkgrdflag = 0; 131 } 132 printf("Can't open %s: %s\n", dev, strerror(errno)); 133 return (0); 134 } 135 if (bkgrdflag) { 136 unlink(snapname); 137 size = MIBSIZE; 138 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0|| 139 sysctlnametomib("vfs.ffs.adjblkcnt", adjblkcnt, &size) < 0|| 140 sysctlnametomib("vfs.ffs.freefiles", freefiles, &size) < 0|| 141 sysctlnametomib("vfs.ffs.freedirs", freedirs, &size) < 0 || 142 sysctlnametomib("vfs.ffs.freeblks", freeblks, &size) < 0) { 143 pfatal("kernel lacks background fsck support\n"); 144 exit(EEXIT); 145 } 146 cmd.version = FFS_CMD_VERSION; 147 cmd.handle = fsreadfd; 148 fswritefd = -1; 149 } 150 if (preen == 0) 151 printf("** %s", dev); 152 if (bkgrdflag == 0 && 153 (nflag || (fswritefd = open(dev, O_WRONLY)) < 0)) { 154 fswritefd = -1; 155 if (preen) 156 pfatal("NO WRITE ACCESS"); 157 printf(" (NO WRITE)"); 158 } 159 if (preen == 0) 160 printf("\n"); 161 /* 162 * Read in the superblock, looking for alternates if necessary 163 */ 164 if (readsb(1) == 0) { 165 skipclean = 0; 166 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 167 return(0); 168 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 169 return (0); 170 for (cg = 0; cg < proto.fs_ncg; cg++) { 171 bflag = fsbtodb(&proto, cgsblock(&proto, cg)); 172 if (readsb(0) != 0) 173 break; 174 } 175 if (cg >= proto.fs_ncg) { 176 printf("%s %s\n%s %s\n%s %s\n", 177 "SEARCH FOR ALTERNATE SUPER-BLOCK", 178 "FAILED. YOU MUST USE THE", 179 "-b OPTION TO FSCK TO SPECIFY THE", 180 "LOCATION OF AN ALTERNATE", 181 "SUPER-BLOCK TO SUPPLY NEEDED", 182 "INFORMATION; SEE fsck(8)."); 183 bflag = 0; 184 return(0); 185 } 186 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 187 bflag = 0; 188 } 189 if (skipclean && preen && sblock.fs_clean) { 190 pwarn("FILESYSTEM CLEAN; SKIPPING CHECKS\n"); 191 return (-1); 192 } 193 maxfsblock = sblock.fs_size; 194 maxino = sblock.fs_ncg * sblock.fs_ipg; 195 /* 196 * Check and potentially fix certain fields in the super block. 197 */ 198 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) { 199 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 200 if (reply("SET TO DEFAULT") == 1) { 201 sblock.fs_optim = FS_OPTTIME; 202 sbdirty(); 203 } 204 } 205 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) { 206 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 207 sblock.fs_minfree); 208 if (reply("SET TO DEFAULT") == 1) { 209 sblock.fs_minfree = 10; 210 sbdirty(); 211 } 212 } 213 if (sblock.fs_inodefmt < FS_44INODEFMT) { 214 pwarn("Format of filesystem is too old.\n"); 215 pwarn("Must update to modern format using a version of fsck\n"); 216 pfatal("from before 2002 with the command ``fsck -c 2''\n"); 217 exit(EEXIT); 218 } 219 if (asblk.b_dirty && !bflag) { 220 memmove(&altsblock, &sblock, (size_t)sblock.fs_sbsize); 221 flush(fswritefd, &asblk); 222 } 223 /* 224 * read in the summary info. 225 */ 226 asked = 0; 227 sblock.fs_csp = calloc(1, sblock.fs_cssize); 228 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 229 size = sblock.fs_cssize - i < sblock.fs_bsize ? 230 sblock.fs_cssize - i : sblock.fs_bsize; 231 if (bread(fsreadfd, (char *)sblock.fs_csp + i, 232 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 233 size) != 0 && !asked) { 234 pfatal("BAD SUMMARY INFORMATION"); 235 if (reply("CONTINUE") == 0) { 236 ckfini(0); 237 exit(EEXIT); 238 } 239 asked++; 240 } 241 } 242 /* 243 * allocate and initialize the necessary maps 244 */ 245 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(short)); 246 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 247 if (blockmap == NULL) { 248 printf("cannot alloc %u bytes for blockmap\n", 249 (unsigned)bmapsize); 250 goto badsb; 251 } 252 inostathead = calloc((unsigned)(sblock.fs_ncg), 253 sizeof(struct inostatlist)); 254 if (inostathead == NULL) { 255 printf("cannot alloc %u bytes for inostathead\n", 256 (unsigned)(sizeof(struct inostatlist) * (sblock.fs_ncg))); 257 goto badsb; 258 } 259 numdirs = sblock.fs_cstotal.cs_ndir; 260 dirhash = numdirs; 261 if (numdirs == 0) { 262 printf("numdirs is zero, try using an alternate superblock\n"); 263 goto badsb; 264 } 265 inplast = 0; 266 listmax = numdirs + 10; 267 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 268 sizeof(struct inoinfo *)); 269 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 270 sizeof(struct inoinfo *)); 271 if (inpsort == NULL || inphead == NULL) { 272 printf("cannot alloc %u bytes for inphead\n", 273 (unsigned)numdirs * sizeof(struct inoinfo *)); 274 goto badsb; 275 } 276 bufinit(); 277 if (sblock.fs_flags & FS_DOSOFTDEP) 278 usedsoftdep = 1; 279 else 280 usedsoftdep = 0; 281 return (1); 282 283badsb: 284 ckfini(0); 285 return (0); 286} 287 288/* 289 * Read in the super block and its summary info. 290 */ 291int 292readsb(int listerr) 293{ 294 ufs_daddr_t super = bflag ? bflag : SBOFF / dev_bsize; 295 296 if (bread(fsreadfd, (char *)&sblock, super, (long)SBSIZE) != 0) 297 return (0); 298 sblk.b_bno = super; 299 sblk.b_size = SBSIZE; 300 /* 301 * run a few consistency checks of the super block 302 */ 303 if (sblock.fs_magic != FS_MAGIC) 304 { badsb(listerr, "MAGIC NUMBER WRONG"); return (0); } 305 if (sblock.fs_ncg < 1) 306 { badsb(listerr, "NCG OUT OF RANGE"); return (0); } 307 if (sblock.fs_cpg < 1) 308 { badsb(listerr, "CPG OUT OF RANGE"); return (0); } 309 if (sblock.fs_sbsize > SBSIZE) 310 { badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); } 311 /* 312 * Compute block size that the filesystem is based on, 313 * according to fsbtodb, and adjust superblock block number 314 * so we can tell if this is an alternate later. 315 */ 316 super *= dev_bsize; 317 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1); 318 sblk.b_bno = super / dev_bsize; 319 if (bflag) { 320 havesb = 1; 321 return (1); 322 } 323 /* 324 * Compare all fields that should not differ in alternate super block. 325 * When an alternate super-block is specified this check is skipped. 326 */ 327 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); 328 if (asblk.b_errs) 329 return (0); 330 if (altsblock.fs_sblkno != sblock.fs_sblkno || 331 altsblock.fs_cblkno != sblock.fs_cblkno || 332 altsblock.fs_iblkno != sblock.fs_iblkno || 333 altsblock.fs_dblkno != sblock.fs_dblkno || 334 altsblock.fs_cgoffset != sblock.fs_cgoffset || 335 altsblock.fs_cgmask != sblock.fs_cgmask || 336 altsblock.fs_ncg != sblock.fs_ncg || 337 altsblock.fs_bsize != sblock.fs_bsize || 338 altsblock.fs_fsize != sblock.fs_fsize || 339 altsblock.fs_frag != sblock.fs_frag || 340 altsblock.fs_bmask != sblock.fs_bmask || 341 altsblock.fs_fmask != sblock.fs_fmask || 342 altsblock.fs_bshift != sblock.fs_bshift || 343 altsblock.fs_fshift != sblock.fs_fshift || 344 altsblock.fs_fragshift != sblock.fs_fragshift || 345 altsblock.fs_fsbtodb != sblock.fs_fsbtodb || 346 altsblock.fs_sbsize != sblock.fs_sbsize || 347 altsblock.fs_nindir != sblock.fs_nindir || 348 altsblock.fs_inopb != sblock.fs_inopb || 349 altsblock.fs_cssize != sblock.fs_cssize || 350 altsblock.fs_cpg != sblock.fs_cpg || 351 altsblock.fs_ipg != sblock.fs_ipg || 352 altsblock.fs_fpg != sblock.fs_fpg || 353 altsblock.fs_magic != sblock.fs_magic) { 354 badsb(listerr, 355 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 356 return (0); 357 } 358 havesb = 1; 359 return (1); 360} 361 362static void 363badsb(int listerr, char *s) 364{ 365 366 if (!listerr) 367 return; 368 if (preen) 369 printf("%s: ", cdevname); 370 pfatal("BAD SUPER BLOCK: %s\n", s); 371} 372 373void 374sblock_init(void) 375{ 376 struct disklabel *lp; 377 378 fswritefd = -1; 379 fsmodified = 0; 380 lfdir = 0; 381 initbarea(&sblk); 382 initbarea(&asblk); 383 sblk.b_un.b_buf = malloc(SBSIZE); 384 asblk.b_un.b_buf = malloc(SBSIZE); 385 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 386 errx(EEXIT, "cannot allocate space for superblock"); 387 if ((lp = getdisklabel(NULL, fsreadfd))) 388 dev_bsize = secsize = lp->d_secsize; 389 else 390 dev_bsize = secsize = DEV_BSIZE; 391} 392 393/* 394 * Calculate a prototype superblock based on information in the disk label. 395 * When done the cgsblock macro can be calculated and the fs_ncg field 396 * can be used. Do NOT attempt to use other macros without verifying that 397 * their needed information is available! 398 */ 399static int 400calcsb(char *dev, int devfd, struct fs *fs) 401{ 402 struct disklabel *lp; 403 struct partition *pp; 404 char *cp; 405 int i; 406 407 cp = strchr(dev, '\0') - 1; 408 if (cp == (char *)-1 || ((*cp < 'a' || *cp > 'h') && !isdigit(*cp))) { 409 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 410 return (0); 411 } 412 lp = getdisklabel(dev, devfd); 413 if (isdigit(*cp)) 414 pp = &lp->d_partitions[0]; 415 else 416 pp = &lp->d_partitions[*cp - 'a']; 417 if (pp->p_fstype != FS_BSDFFS) { 418 pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n", 419 dev, pp->p_fstype < FSMAXTYPES ? 420 fstypenames[pp->p_fstype] : "unknown"); 421 return (0); 422 } 423 if (pp->p_fsize == 0 || pp->p_frag == 0 || 424 pp->p_cpg == 0 || pp->p_size == 0) { 425 pfatal("%s: %s: type %s fsize %d, frag %d, cpg %d, size %d\n", 426 dev, "INCOMPLETE LABEL", fstypenames[pp->p_fstype], 427 pp->p_fsize, pp->p_frag, pp->p_cpg, pp->p_size); 428 return (0); 429 } 430 memset(fs, 0, sizeof(struct fs)); 431 fs->fs_fsize = pp->p_fsize; 432 fs->fs_frag = pp->p_frag; 433 fs->fs_cpg = pp->p_cpg; 434 fs->fs_size = pp->p_size; 435 fs->fs_ntrak = lp->d_ntracks; 436 fs->fs_nsect = lp->d_nsectors; 437 fs->fs_spc = lp->d_secpercyl; 438 fs->fs_nspf = fs->fs_fsize / lp->d_secsize; 439 fs->fs_cgmask = 0xffffffff; 440 for (i = fs->fs_ntrak; i > 1; i >>= 1) 441 fs->fs_cgmask <<= 1; 442 if (!POWEROF2(fs->fs_ntrak)) 443 fs->fs_cgmask <<= 1; 444 fs->fs_cgoffset = roundup( 445 howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag); 446 fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs); 447 fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg); 448 for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1) 449 fs->fs_fsbtodb++; 450 dev_bsize = lp->d_secsize; 451 return (1); 452} 453 454static struct disklabel * 455getdisklabel(char *s, int fd) 456{ 457 static struct disklabel lab; 458 459 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 460 if (s == NULL) 461 return ((struct disklabel *)NULL); 462 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 463 errx(EEXIT, "%s: can't read disk label", s); 464 } 465 return (&lab); 466} 467