setup.c revision 107294
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 107294 2002-11-27 02:18:58Z mckusick $"; 40#endif /* not lint */ 41 42#include <sys/param.h> 43#include <sys/stat.h> 44#define FSTYPENAMES 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 <limits.h> 56#include <stdint.h> 57#include <string.h> 58 59#include "fsck.h" 60 61struct bufarea asblk; 62#define altsblock (*asblk.b_un.b_fs) 63#define POWEROF2(num) (((num) & ((num) - 1)) == 0) 64 65static void badsb(int listerr, const char *s); 66static int calcsb(char *dev, int devfd, struct fs *fs); 67static struct disklabel *getdisklabel(char *s, int fd); 68 69/* 70 * Read in a superblock finding an alternate if necessary. 71 * Return 1 if successful, 0 if unsuccessful, -1 if file system 72 * is already clean (preen mode only). 73 */ 74int 75setup(char *dev) 76{ 77 long cg, asked, i, j; 78 long bmapsize; 79 struct stat statb; 80 struct fs proto; 81 size_t size; 82 83 havesb = 0; 84 fswritefd = -1; 85 cursnapshot = 0; 86 if (stat(dev, &statb) < 0) { 87 printf("Can't stat %s: %s\n", dev, strerror(errno)); 88 if (bkgrdflag) { 89 unlink(snapname); 90 bkgrdflag = 0; 91 } 92 return (0); 93 } 94 if ((statb.st_mode & S_IFMT) != S_IFCHR && 95 (statb.st_mode & S_IFMT) != S_IFBLK) { 96 if (bkgrdflag != 0 && (statb.st_flags & SF_SNAPSHOT) == 0) { 97 unlink(snapname); 98 printf("background fsck lacks a snapshot\n"); 99 exit(EEXIT); 100 } 101 if ((statb.st_flags & SF_SNAPSHOT) != 0 && cvtlevel == 0) { 102 cursnapshot = statb.st_ino; 103 } else { 104 if (cvtlevel == 0 || 105 (statb.st_flags & SF_SNAPSHOT) == 0) { 106 if (preen && bkgrdflag) { 107 unlink(snapname); 108 bkgrdflag = 0; 109 } 110 pfatal("%s is not a disk device", dev); 111 if (reply("CONTINUE") == 0) { 112 if (bkgrdflag) { 113 unlink(snapname); 114 bkgrdflag = 0; 115 } 116 return (0); 117 } 118 } else { 119 if (bkgrdflag) { 120 unlink(snapname); 121 bkgrdflag = 0; 122 } 123 pfatal("cannot convert a snapshot"); 124 exit(EEXIT); 125 } 126 } 127 } 128 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 129 if (bkgrdflag) { 130 unlink(snapname); 131 bkgrdflag = 0; 132 } 133 printf("Can't open %s: %s\n", dev, strerror(errno)); 134 return (0); 135 } 136 if (bkgrdflag) { 137 unlink(snapname); 138 size = MIBSIZE; 139 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0|| 140 sysctlnametomib("vfs.ffs.adjblkcnt", adjblkcnt, &size) < 0|| 141 sysctlnametomib("vfs.ffs.freefiles", freefiles, &size) < 0|| 142 sysctlnametomib("vfs.ffs.freedirs", freedirs, &size) < 0 || 143 sysctlnametomib("vfs.ffs.freeblks", freeblks, &size) < 0) { 144 pfatal("kernel lacks background fsck support\n"); 145 exit(EEXIT); 146 } 147 cmd.version = FFS_CMD_VERSION; 148 cmd.handle = fsreadfd; 149 fswritefd = -1; 150 } 151 if (preen == 0) 152 printf("** %s", dev); 153 if (bkgrdflag == 0 && 154 (nflag || (fswritefd = open(dev, O_WRONLY)) < 0)) { 155 fswritefd = -1; 156 if (preen) 157 pfatal("NO WRITE ACCESS"); 158 printf(" (NO WRITE)"); 159 } 160 if (preen == 0) 161 printf("\n"); 162 /* 163 * Read in the superblock, looking for alternates if necessary 164 */ 165 if (readsb(1) == 0) { 166 skipclean = 0; 167 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 168 return(0); 169 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 170 return (0); 171 for (cg = 0; cg < proto.fs_ncg; cg++) { 172 bflag = fsbtodb(&proto, cgsblock(&proto, cg)); 173 if (readsb(0) != 0) 174 break; 175 } 176 if (cg >= proto.fs_ncg) { 177 printf("%s %s\n%s %s\n%s %s\n", 178 "SEARCH FOR ALTERNATE SUPER-BLOCK", 179 "FAILED. YOU MUST USE THE", 180 "-b OPTION TO FSCK TO SPECIFY THE", 181 "LOCATION OF AN ALTERNATE", 182 "SUPER-BLOCK TO SUPPLY NEEDED", 183 "INFORMATION; SEE fsck(8)."); 184 bflag = 0; 185 return(0); 186 } 187 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 188 bflag = 0; 189 } 190 if (skipclean && preen && sblock.fs_clean) { 191 pwarn("FILESYSTEM CLEAN; SKIPPING CHECKS\n"); 192 return (-1); 193 } 194 maxfsblock = sblock.fs_size; 195 maxino = sblock.fs_ncg * sblock.fs_ipg; 196 /* 197 * Check and potentially fix certain fields in the super block. 198 */ 199 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) { 200 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 201 if (reply("SET TO DEFAULT") == 1) { 202 sblock.fs_optim = FS_OPTTIME; 203 sbdirty(); 204 } 205 } 206 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) { 207 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 208 sblock.fs_minfree); 209 if (reply("SET TO DEFAULT") == 1) { 210 sblock.fs_minfree = 10; 211 sbdirty(); 212 } 213 } 214 if (sblock.fs_magic == FS_UFS1_MAGIC && 215 sblock.fs_old_inodefmt < FS_44INODEFMT) { 216 pwarn("Format of file system is too old.\n"); 217 pwarn("Must update to modern format using a version of fsck\n"); 218 pfatal("from before 2002 with the command ``fsck -c 2''\n"); 219 exit(EEXIT); 220 } 221 if (asblk.b_dirty && !bflag) { 222 memmove(&altsblock, &sblock, (size_t)sblock.fs_sbsize); 223 flush(fswritefd, &asblk); 224 } 225 /* 226 * read in the summary info. 227 */ 228 asked = 0; 229 sblock.fs_csp = calloc(1, sblock.fs_cssize); 230 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 231 size = sblock.fs_cssize - i < sblock.fs_bsize ? 232 sblock.fs_cssize - i : sblock.fs_bsize; 233 if (bread(fsreadfd, (char *)sblock.fs_csp + i, 234 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 235 size) != 0 && !asked) { 236 pfatal("BAD SUMMARY INFORMATION"); 237 if (reply("CONTINUE") == 0) { 238 ckfini(0); 239 exit(EEXIT); 240 } 241 asked++; 242 } 243 } 244 /* 245 * allocate and initialize the necessary maps 246 */ 247 bmapsize = roundup(howmany(maxfsblock, CHAR_BIT), sizeof(short)); 248 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 249 if (blockmap == NULL) { 250 printf("cannot alloc %u bytes for blockmap\n", 251 (unsigned)bmapsize); 252 goto badsb; 253 } 254 inostathead = calloc((unsigned)(sblock.fs_ncg), 255 sizeof(struct inostatlist)); 256 if (inostathead == NULL) { 257 printf("cannot alloc %u bytes for inostathead\n", 258 (unsigned)(sizeof(struct inostatlist) * (sblock.fs_ncg))); 259 goto badsb; 260 } 261 numdirs = sblock.fs_cstotal.cs_ndir; 262 dirhash = numdirs; 263 if (numdirs == 0) { 264 printf("numdirs is zero, try using an alternate superblock\n"); 265 goto badsb; 266 } 267 inplast = 0; 268 listmax = numdirs + 10; 269 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 270 sizeof(struct inoinfo *)); 271 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 272 sizeof(struct inoinfo *)); 273 if (inpsort == NULL || inphead == NULL) { 274 printf("cannot alloc %ju bytes for inphead\n", 275 (uintmax_t)numdirs * sizeof(struct inoinfo *)); 276 goto badsb; 277 } 278 bufinit(); 279 if (sblock.fs_flags & FS_DOSOFTDEP) 280 usedsoftdep = 1; 281 else 282 usedsoftdep = 0; 283 return (1); 284 285badsb: 286 ckfini(0); 287 return (0); 288} 289 290/* 291 * Possible superblock locations ordered from most to least likely. 292 */ 293static int sblock_try[] = SBLOCKSEARCH; 294 295/* 296 * Read in the super block and its summary info. 297 */ 298int 299readsb(int listerr) 300{ 301 ufs2_daddr_t super; 302 int i; 303 304 if (bflag) { 305 super = bflag; 306 if ((bread(fsreadfd, (char *)&sblock, super, (long)SBLOCKSIZE))) 307 return (0); 308 } else { 309 for (i = 0; sblock_try[i] != -1; i++) { 310 super = sblock_try[i] / dev_bsize; 311 if ((bread(fsreadfd, (char *)&sblock, super, 312 (long)SBLOCKSIZE))) 313 return (0); 314 if ((sblock.fs_magic == FS_UFS1_MAGIC || 315 (sblock.fs_magic == FS_UFS2_MAGIC && 316 sblock.fs_sblockloc == sblock_try[i])) && 317 sblock.fs_ncg >= 1 && 318 sblock.fs_bsize >= MINBSIZE && 319 sblock.fs_bsize >= sizeof(struct fs)) 320 break; 321 } 322 if (sblock_try[i] == -1) { 323 fprintf(stderr, "Cannot find file system superblock\n"); 324 return (0); 325 } 326 } 327 /* 328 * Compute block size that the file system is based on, 329 * according to fsbtodb, and adjust superblock block number 330 * so we can tell if this is an alternate later. 331 */ 332 super *= dev_bsize; 333 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1); 334 sblk.b_bno = super / dev_bsize; 335 sblk.b_size = SBLOCKSIZE; 336 if (bflag) { 337 havesb = 1; 338 return (1); 339 } 340 /* 341 * Compare all fields that should not differ in alternate super block. 342 * When an alternate super-block is specified this check is skipped. 343 */ 344 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); 345 if (asblk.b_errs) 346 return (0); 347 if (altsblock.fs_sblkno != sblock.fs_sblkno || 348 altsblock.fs_cblkno != sblock.fs_cblkno || 349 altsblock.fs_iblkno != sblock.fs_iblkno || 350 altsblock.fs_dblkno != sblock.fs_dblkno || 351 altsblock.fs_ncg != sblock.fs_ncg || 352 altsblock.fs_bsize != sblock.fs_bsize || 353 altsblock.fs_fsize != sblock.fs_fsize || 354 altsblock.fs_frag != sblock.fs_frag || 355 altsblock.fs_bmask != sblock.fs_bmask || 356 altsblock.fs_fmask != sblock.fs_fmask || 357 altsblock.fs_bshift != sblock.fs_bshift || 358 altsblock.fs_fshift != sblock.fs_fshift || 359 altsblock.fs_fragshift != sblock.fs_fragshift || 360 altsblock.fs_fsbtodb != sblock.fs_fsbtodb || 361 altsblock.fs_sbsize != sblock.fs_sbsize || 362 altsblock.fs_nindir != sblock.fs_nindir || 363 altsblock.fs_inopb != sblock.fs_inopb || 364 altsblock.fs_cssize != sblock.fs_cssize || 365 altsblock.fs_ipg != sblock.fs_ipg || 366 altsblock.fs_fpg != sblock.fs_fpg || 367 altsblock.fs_magic != sblock.fs_magic) { 368 badsb(listerr, 369 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 370 return (0); 371 } 372 /* 373 * If not yet done, update UFS1 superblock with new wider fields. 374 */ 375 if (sblock.fs_magic == FS_UFS1_MAGIC && 376 sblock.fs_maxbsize != sblock.fs_bsize) { 377 sblock.fs_maxbsize = sblock.fs_bsize; 378 sblock.fs_time = sblock.fs_old_time; 379 sblock.fs_size = sblock.fs_old_size; 380 sblock.fs_dsize = sblock.fs_old_dsize; 381 sblock.fs_csaddr = sblock.fs_old_csaddr; 382 sblock.fs_cstotal.cs_ndir = sblock.fs_old_cstotal.cs_ndir; 383 sblock.fs_cstotal.cs_nbfree = sblock.fs_old_cstotal.cs_nbfree; 384 sblock.fs_cstotal.cs_nifree = sblock.fs_old_cstotal.cs_nifree; 385 sblock.fs_cstotal.cs_nffree = sblock.fs_old_cstotal.cs_nffree; 386 } 387 havesb = 1; 388 return (1); 389} 390 391static void 392badsb(int listerr, const char *s) 393{ 394 395 if (!listerr) 396 return; 397 if (preen) 398 printf("%s: ", cdevname); 399 pfatal("BAD SUPER BLOCK: %s\n", s); 400} 401 402void 403sblock_init(void) 404{ 405 struct disklabel *lp; 406 407 fswritefd = -1; 408 fsmodified = 0; 409 lfdir = 0; 410 initbarea(&sblk); 411 initbarea(&asblk); 412 sblk.b_un.b_buf = malloc(SBLOCKSIZE); 413 asblk.b_un.b_buf = malloc(SBLOCKSIZE); 414 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 415 errx(EEXIT, "cannot allocate space for superblock"); 416 if ((lp = getdisklabel(NULL, fsreadfd))) 417 dev_bsize = secsize = lp->d_secsize; 418 else 419 dev_bsize = secsize = DEV_BSIZE; 420} 421 422/* 423 * Calculate a prototype superblock based on information in the disk label. 424 * When done the cgsblock macro can be calculated and the fs_ncg field 425 * can be used. Do NOT attempt to use other macros without verifying that 426 * their needed information is available! 427 */ 428static int 429calcsb(char *dev, int devfd, struct fs *fs) 430{ 431 struct disklabel *lp; 432 struct partition *pp; 433 char *cp; 434 int i, nspf; 435 436 cp = strchr(dev, '\0') - 1; 437 if (cp == (char *)-1 || ((*cp < 'a' || *cp > 'h') && !isdigit(*cp))) { 438 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 439 return (0); 440 } 441 lp = getdisklabel(dev, devfd); 442 if (isdigit(*cp)) 443 pp = &lp->d_partitions[0]; 444 else 445 pp = &lp->d_partitions[*cp - 'a']; 446 if (pp->p_fstype != FS_BSDFFS) { 447 pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n", 448 dev, pp->p_fstype < FSMAXTYPES ? 449 fstypenames[pp->p_fstype] : "unknown"); 450 return (0); 451 } 452 if (pp->p_fsize == 0 || pp->p_frag == 0 || 453 pp->p_cpg == 0 || pp->p_size == 0) { 454 pfatal("%s: %s: type %s fsize %d, frag %d, cpg %d, size %d\n", 455 dev, "INCOMPLETE LABEL", fstypenames[pp->p_fstype], 456 pp->p_fsize, pp->p_frag, pp->p_cpg, pp->p_size); 457 return (0); 458 } 459 memset(fs, 0, sizeof(struct fs)); 460 fs->fs_fsize = pp->p_fsize; 461 fs->fs_frag = pp->p_frag; 462 fs->fs_size = pp->p_size; 463 fs->fs_sblkno = roundup( 464 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 465 fs->fs_frag); 466 nspf = fs->fs_fsize / lp->d_secsize; 467 for (fs->fs_fsbtodb = 0, i = nspf; i > 1; i >>= 1) 468 fs->fs_fsbtodb++; 469 dev_bsize = lp->d_secsize; 470 if (fs->fs_magic == FS_UFS2_MAGIC) { 471 fs->fs_fpg = pp->p_cpg; 472 fs->fs_ncg = howmany(fs->fs_size, fs->fs_fpg); 473 } else /* if (fs->fs_magic == FS_UFS1_MAGIC) */ { 474 fs->fs_old_cpg = pp->p_cpg; 475 fs->fs_old_cgmask = 0xffffffff; 476 for (i = lp->d_ntracks; i > 1; i >>= 1) 477 fs->fs_old_cgmask <<= 1; 478 if (!POWEROF2(lp->d_ntracks)) 479 fs->fs_old_cgmask <<= 1; 480 fs->fs_old_cgoffset = roundup(howmany(lp->d_nsectors, nspf), 481 fs->fs_frag); 482 fs->fs_fpg = (fs->fs_old_cpg * lp->d_secpercyl) / nspf; 483 fs->fs_ncg = howmany(fs->fs_size / lp->d_secpercyl, 484 fs->fs_old_cpg); 485 } 486 return (1); 487} 488 489static struct disklabel * 490getdisklabel(char *s, int fd) 491{ 492 static struct disklabel lab; 493 494 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 495 if (s == NULL) 496 return ((struct disklabel *)NULL); 497 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 498 errx(EEXIT, "%s: can't read disk label", s); 499 } 500 return (&lab); 501} 502