setup.c revision 134011
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 * 4. 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 30#if 0 31#ifndef lint 32static const char sccsid[] = "@(#)setup.c 8.10 (Berkeley) 5/9/95"; 33#endif /* not lint */ 34#endif 35#include <sys/cdefs.h> 36__FBSDID("$FreeBSD: head/sbin/fsck_ffs/setup.c 134011 2004-08-19 11:09:13Z jhb $"); 37 38#include <sys/param.h> 39#include <sys/stat.h> 40#define FSTYPENAMES 41#include <sys/disklabel.h> 42#include <sys/file.h> 43#include <sys/sysctl.h> 44 45#include <ufs/ufs/dinode.h> 46#include <ufs/ffs/fs.h> 47 48#include <ctype.h> 49#include <err.h> 50#include <errno.h> 51#include <limits.h> 52#include <stdint.h> 53#include <string.h> 54 55#include "fsck.h" 56 57struct bufarea asblk; 58#define altsblock (*asblk.b_un.b_fs) 59#define POWEROF2(num) (((num) & ((num) - 1)) == 0) 60 61static void badsb(int listerr, const char *s); 62static int calcsb(char *dev, int devfd, struct fs *fs); 63static struct disklabel *getdisklabel(char *s, int fd); 64 65/* 66 * Read in a superblock finding an alternate if necessary. 67 * Return 1 if successful, 0 if unsuccessful, -1 if file system 68 * is already clean (preen mode only). 69 */ 70int 71setup(char *dev) 72{ 73 long cg, asked, i, j; 74 long bmapsize; 75 struct stat statb; 76 struct fs proto; 77 size_t size; 78 79 havesb = 0; 80 fswritefd = -1; 81 cursnapshot = 0; 82 if (stat(dev, &statb) < 0) { 83 printf("Can't stat %s: %s\n", dev, strerror(errno)); 84 if (bkgrdflag) { 85 unlink(snapname); 86 bkgrdflag = 0; 87 } 88 return (0); 89 } 90 if ((statb.st_mode & S_IFMT) != S_IFCHR && 91 (statb.st_mode & S_IFMT) != S_IFBLK) { 92 if (bkgrdflag != 0 && (statb.st_flags & SF_SNAPSHOT) == 0) { 93 unlink(snapname); 94 printf("background fsck lacks a snapshot\n"); 95 exit(EEXIT); 96 } 97 if ((statb.st_flags & SF_SNAPSHOT) != 0 && cvtlevel == 0) { 98 cursnapshot = statb.st_ino; 99 } else { 100 if (cvtlevel == 0 || 101 (statb.st_flags & SF_SNAPSHOT) == 0) { 102 if (preen && bkgrdflag) { 103 unlink(snapname); 104 bkgrdflag = 0; 105 } 106 pfatal("%s is not a disk device", dev); 107 if (reply("CONTINUE") == 0) { 108 if (bkgrdflag) { 109 unlink(snapname); 110 bkgrdflag = 0; 111 } 112 return (0); 113 } 114 } else { 115 if (bkgrdflag) { 116 unlink(snapname); 117 bkgrdflag = 0; 118 } 119 pfatal("cannot convert a snapshot"); 120 exit(EEXIT); 121 } 122 } 123 } 124 if ((fsreadfd = open(dev, O_RDONLY)) < 0) { 125 if (bkgrdflag) { 126 unlink(snapname); 127 bkgrdflag = 0; 128 } 129 printf("Can't open %s: %s\n", dev, strerror(errno)); 130 return (0); 131 } 132 if (bkgrdflag) { 133 unlink(snapname); 134 size = MIBSIZE; 135 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0|| 136 sysctlnametomib("vfs.ffs.adjblkcnt", adjblkcnt, &size) < 0|| 137 sysctlnametomib("vfs.ffs.freefiles", freefiles, &size) < 0|| 138 sysctlnametomib("vfs.ffs.freedirs", freedirs, &size) < 0 || 139 sysctlnametomib("vfs.ffs.freeblks", freeblks, &size) < 0) { 140 pfatal("kernel lacks background fsck support\n"); 141 exit(EEXIT); 142 } 143 cmd.version = FFS_CMD_VERSION; 144 cmd.handle = fsreadfd; 145 fswritefd = -1; 146 } 147 if (preen == 0) 148 printf("** %s", dev); 149 if (bkgrdflag == 0 && 150 (nflag || (fswritefd = open(dev, O_WRONLY)) < 0)) { 151 fswritefd = -1; 152 if (preen) 153 pfatal("NO WRITE ACCESS"); 154 printf(" (NO WRITE)"); 155 } 156 if (preen == 0) 157 printf("\n"); 158 /* 159 * Read in the superblock, looking for alternates if necessary 160 */ 161 if (readsb(1) == 0) { 162 skipclean = 0; 163 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 164 return(0); 165 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 166 return (0); 167 for (cg = 0; cg < proto.fs_ncg; cg++) { 168 bflag = fsbtodb(&proto, cgsblock(&proto, cg)); 169 if (readsb(0) != 0) 170 break; 171 } 172 if (cg >= proto.fs_ncg) { 173 printf("%s %s\n%s %s\n%s %s\n", 174 "SEARCH FOR ALTERNATE SUPER-BLOCK", 175 "FAILED. YOU MUST USE THE", 176 "-b OPTION TO FSCK TO SPECIFY THE", 177 "LOCATION OF AN ALTERNATE", 178 "SUPER-BLOCK TO SUPPLY NEEDED", 179 "INFORMATION; SEE fsck(8)."); 180 bflag = 0; 181 return(0); 182 } 183 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 184 bflag = 0; 185 } 186 if (skipclean && preen && sblock.fs_clean) { 187 pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n"); 188 return (-1); 189 } 190 maxfsblock = sblock.fs_size; 191 maxino = sblock.fs_ncg * sblock.fs_ipg; 192 /* 193 * Check and potentially fix certain fields in the super block. 194 */ 195 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) { 196 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 197 if (reply("SET TO DEFAULT") == 1) { 198 sblock.fs_optim = FS_OPTTIME; 199 sbdirty(); 200 } 201 } 202 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) { 203 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 204 sblock.fs_minfree); 205 if (reply("SET TO DEFAULT") == 1) { 206 sblock.fs_minfree = 10; 207 sbdirty(); 208 } 209 } 210 if (sblock.fs_magic == FS_UFS1_MAGIC && 211 sblock.fs_old_inodefmt < FS_44INODEFMT) { 212 pwarn("Format of file system is too old.\n"); 213 pwarn("Must update to modern format using a version of fsck\n"); 214 pfatal("from before 2002 with the command ``fsck -c 2''\n"); 215 exit(EEXIT); 216 } 217 if (asblk.b_dirty && !bflag) { 218 memmove(&altsblock, &sblock, (size_t)sblock.fs_sbsize); 219 flush(fswritefd, &asblk); 220 } 221 /* 222 * read in the summary info. 223 */ 224 asked = 0; 225 sblock.fs_csp = calloc(1, sblock.fs_cssize); 226 if (sblock.fs_csp == NULL) { 227 printf("cannot alloc %u bytes for cg summary info\n", 228 (unsigned)sblock.fs_cssize); 229 goto badsb; 230 } 231 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 232 size = sblock.fs_cssize - i < sblock.fs_bsize ? 233 sblock.fs_cssize - i : sblock.fs_bsize; 234 if (bread(fsreadfd, (char *)sblock.fs_csp + i, 235 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 236 size) != 0 && !asked) { 237 pfatal("BAD SUMMARY INFORMATION"); 238 if (reply("CONTINUE") == 0) { 239 ckfini(0); 240 exit(EEXIT); 241 } 242 asked++; 243 } 244 } 245 /* 246 * allocate and initialize the necessary maps 247 */ 248 bmapsize = roundup(howmany(maxfsblock, CHAR_BIT), sizeof(short)); 249 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 250 if (blockmap == NULL) { 251 printf("cannot alloc %u bytes for blockmap\n", 252 (unsigned)bmapsize); 253 goto badsb; 254 } 255 inostathead = calloc((unsigned)(sblock.fs_ncg), 256 sizeof(struct inostatlist)); 257 if (inostathead == NULL) { 258 printf("cannot alloc %u bytes for inostathead\n", 259 (unsigned)(sizeof(struct inostatlist) * (sblock.fs_ncg))); 260 goto badsb; 261 } 262 numdirs = MAX(sblock.fs_cstotal.cs_ndir, 128); 263 dirhash = numdirs; 264 inplast = 0; 265 listmax = numdirs + 10; 266 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 267 sizeof(struct inoinfo *)); 268 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 269 sizeof(struct inoinfo *)); 270 if (inpsort == NULL || inphead == NULL) { 271 printf("cannot alloc %ju bytes for inphead\n", 272 (uintmax_t)numdirs * sizeof(struct inoinfo *)); 273 goto badsb; 274 } 275 bufinit(); 276 if (sblock.fs_flags & FS_DOSOFTDEP) 277 usedsoftdep = 1; 278 else 279 usedsoftdep = 0; 280 return (1); 281 282badsb: 283 ckfini(0); 284 return (0); 285} 286 287/* 288 * Possible superblock locations ordered from most to least likely. 289 */ 290static int sblock_try[] = SBLOCKSEARCH; 291 292#define BAD_MAGIC_MSG \ 293"The previous newfs operation on this volume did not complete.\n" \ 294"You must complete newfs before mounting this volume.\n" 295 296/* 297 * Read in the super block and its summary info. 298 */ 299int 300readsb(int listerr) 301{ 302 ufs2_daddr_t super; 303 int i; 304 305 if (bflag) { 306 super = bflag; 307 if ((bread(fsreadfd, (char *)&sblock, super, (long)SBLOCKSIZE))) 308 return (0); 309 if (sblock.fs_magic == FS_BAD_MAGIC) { 310 fprintf(stderr, BAD_MAGIC_MSG); 311 exit(11); 312 } 313 if (sblock.fs_magic != FS_UFS1_MAGIC && 314 sblock.fs_magic != FS_UFS2_MAGIC) { 315 fprintf(stderr, "%d is not a file system superblock\n", 316 bflag); 317 return (0); 318 } 319 } else { 320 for (i = 0; sblock_try[i] != -1; i++) { 321 super = sblock_try[i] / dev_bsize; 322 if ((bread(fsreadfd, (char *)&sblock, super, 323 (long)SBLOCKSIZE))) 324 return (0); 325 if (sblock.fs_magic == FS_BAD_MAGIC) { 326 fprintf(stderr, BAD_MAGIC_MSG); 327 exit(11); 328 } 329 if ((sblock.fs_magic == FS_UFS1_MAGIC || 330 (sblock.fs_magic == FS_UFS2_MAGIC && 331 sblock.fs_sblockloc == sblock_try[i])) && 332 sblock.fs_ncg >= 1 && 333 sblock.fs_bsize >= MINBSIZE && 334 sblock.fs_bsize >= sizeof(struct fs)) 335 break; 336 } 337 if (sblock_try[i] == -1) { 338 fprintf(stderr, "Cannot find file system superblock\n"); 339 return (0); 340 } 341 } 342 /* 343 * Compute block size that the file system is based on, 344 * according to fsbtodb, and adjust superblock block number 345 * so we can tell if this is an alternate later. 346 */ 347 super *= dev_bsize; 348 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1); 349 sblk.b_bno = super / dev_bsize; 350 sblk.b_size = SBLOCKSIZE; 351 if (bflag) 352 goto out; 353 /* 354 * Compare all fields that should not differ in alternate super block. 355 * When an alternate super-block is specified this check is skipped. 356 */ 357 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); 358 if (asblk.b_errs) 359 return (0); 360 if (altsblock.fs_sblkno != sblock.fs_sblkno || 361 altsblock.fs_cblkno != sblock.fs_cblkno || 362 altsblock.fs_iblkno != sblock.fs_iblkno || 363 altsblock.fs_dblkno != sblock.fs_dblkno || 364 altsblock.fs_ncg != sblock.fs_ncg || 365 altsblock.fs_bsize != sblock.fs_bsize || 366 altsblock.fs_fsize != sblock.fs_fsize || 367 altsblock.fs_frag != sblock.fs_frag || 368 altsblock.fs_bmask != sblock.fs_bmask || 369 altsblock.fs_fmask != sblock.fs_fmask || 370 altsblock.fs_bshift != sblock.fs_bshift || 371 altsblock.fs_fshift != sblock.fs_fshift || 372 altsblock.fs_fragshift != sblock.fs_fragshift || 373 altsblock.fs_fsbtodb != sblock.fs_fsbtodb || 374 altsblock.fs_sbsize != sblock.fs_sbsize || 375 altsblock.fs_nindir != sblock.fs_nindir || 376 altsblock.fs_inopb != sblock.fs_inopb || 377 altsblock.fs_cssize != sblock.fs_cssize || 378 altsblock.fs_ipg != sblock.fs_ipg || 379 altsblock.fs_fpg != sblock.fs_fpg || 380 altsblock.fs_magic != sblock.fs_magic) { 381 badsb(listerr, 382 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 383 return (0); 384 } 385out: 386 /* 387 * If not yet done, update UFS1 superblock with new wider fields. 388 */ 389 if (sblock.fs_magic == FS_UFS1_MAGIC && 390 sblock.fs_maxbsize != sblock.fs_bsize) { 391 sblock.fs_maxbsize = sblock.fs_bsize; 392 sblock.fs_time = sblock.fs_old_time; 393 sblock.fs_size = sblock.fs_old_size; 394 sblock.fs_dsize = sblock.fs_old_dsize; 395 sblock.fs_csaddr = sblock.fs_old_csaddr; 396 sblock.fs_cstotal.cs_ndir = sblock.fs_old_cstotal.cs_ndir; 397 sblock.fs_cstotal.cs_nbfree = sblock.fs_old_cstotal.cs_nbfree; 398 sblock.fs_cstotal.cs_nifree = sblock.fs_old_cstotal.cs_nifree; 399 sblock.fs_cstotal.cs_nffree = sblock.fs_old_cstotal.cs_nffree; 400 } 401 havesb = 1; 402 return (1); 403} 404 405static void 406badsb(int listerr, const char *s) 407{ 408 409 if (!listerr) 410 return; 411 if (preen) 412 printf("%s: ", cdevname); 413 pfatal("BAD SUPER BLOCK: %s\n", s); 414} 415 416void 417sblock_init(void) 418{ 419 struct disklabel *lp; 420 421 fswritefd = -1; 422 fsmodified = 0; 423 lfdir = 0; 424 initbarea(&sblk); 425 initbarea(&asblk); 426 sblk.b_un.b_buf = malloc(SBLOCKSIZE); 427 asblk.b_un.b_buf = malloc(SBLOCKSIZE); 428 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 429 errx(EEXIT, "cannot allocate space for superblock"); 430 if ((lp = getdisklabel(NULL, fsreadfd))) 431 dev_bsize = secsize = lp->d_secsize; 432 else 433 dev_bsize = secsize = DEV_BSIZE; 434} 435 436/* 437 * Calculate a prototype superblock based on information in the disk label. 438 * When done the cgsblock macro can be calculated and the fs_ncg field 439 * can be used. Do NOT attempt to use other macros without verifying that 440 * their needed information is available! 441 */ 442static int 443calcsb(char *dev, int devfd, struct fs *fs) 444{ 445 struct disklabel *lp; 446 struct partition *pp; 447 char *cp; 448 int i, nspf; 449 450 cp = strchr(dev, '\0') - 1; 451 if (cp == (char *)-1 || ((*cp < 'a' || *cp > 'h') && !isdigit(*cp))) { 452 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 453 return (0); 454 } 455 lp = getdisklabel(dev, devfd); 456 if (isdigit(*cp)) 457 pp = &lp->d_partitions[0]; 458 else 459 pp = &lp->d_partitions[*cp - 'a']; 460 if (pp->p_fstype != FS_BSDFFS) { 461 pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n", 462 dev, pp->p_fstype < FSMAXTYPES ? 463 fstypenames[pp->p_fstype] : "unknown"); 464 return (0); 465 } 466 if (pp->p_fsize == 0 || pp->p_frag == 0 || 467 pp->p_cpg == 0 || pp->p_size == 0) { 468 pfatal("%s: %s: type %s fsize %d, frag %d, cpg %d, size %d\n", 469 dev, "INCOMPLETE LABEL", fstypenames[pp->p_fstype], 470 pp->p_fsize, pp->p_frag, pp->p_cpg, pp->p_size); 471 return (0); 472 } 473 memset(fs, 0, sizeof(struct fs)); 474 fs->fs_fsize = pp->p_fsize; 475 fs->fs_frag = pp->p_frag; 476 fs->fs_size = pp->p_size; 477 fs->fs_sblkno = roundup( 478 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 479 fs->fs_frag); 480 nspf = fs->fs_fsize / lp->d_secsize; 481 for (fs->fs_fsbtodb = 0, i = nspf; i > 1; i >>= 1) 482 fs->fs_fsbtodb++; 483 dev_bsize = lp->d_secsize; 484 if (fs->fs_magic == FS_UFS2_MAGIC) { 485 fs->fs_fpg = pp->p_cpg; 486 fs->fs_ncg = howmany(fs->fs_size, fs->fs_fpg); 487 } else /* if (fs->fs_magic == FS_UFS1_MAGIC) */ { 488 fs->fs_old_cpg = pp->p_cpg; 489 fs->fs_old_cgmask = 0xffffffff; 490 for (i = lp->d_ntracks; i > 1; i >>= 1) 491 fs->fs_old_cgmask <<= 1; 492 if (!POWEROF2(lp->d_ntracks)) 493 fs->fs_old_cgmask <<= 1; 494 fs->fs_old_cgoffset = roundup(howmany(lp->d_nsectors, nspf), 495 fs->fs_frag); 496 fs->fs_fpg = (fs->fs_old_cpg * lp->d_secpercyl) / nspf; 497 fs->fs_ncg = howmany(fs->fs_size / lp->d_secpercyl, 498 fs->fs_old_cpg); 499 } 500 return (1); 501} 502 503static struct disklabel * 504getdisklabel(char *s, int fd) 505{ 506 static struct disklabel lab; 507 508 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 509 if (s == NULL) 510 return ((struct disklabel *)NULL); 511 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 512 errx(EEXIT, "%s: can't read disk label", s); 513 } 514 return (&lab); 515} 516