setup.c revision 143235
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 143235 2005-03-07 08:42:49Z delphij $"); 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 /* 144 * When kernel is lack of runtime bgfsck superblock summary 145 * adjustment functionality, it does not mean we can not 146 * continue, as old kernels will recompute the summary at 147 * mount time. However, it will be an unexpected softupdates 148 * inconsistency if it turns out that the summary is still 149 * incorrect. Set a flag so subsequent operation can know 150 * this. 151 */ 152 bkgrdsumadj = 1; 153 if (sysctlnametomib("vfs.ffs.adjndir", adjndir, &size) < 0 || 154 sysctlnametomib("vfs.ffs.adjnbfree", adjnbfree, &size) < 0 || 155 sysctlnametomib("vfs.ffs.adjnifree", adjnifree, &size) < 0 || 156 sysctlnametomib("vfs.ffs.adjnffree", adjnffree, &size) < 0 || 157 sysctlnametomib("vfs.ffs.adjnumclusters", adjnumclusters, &size) < 0) { 158 bkgrdsumadj = 0; 159 pwarn("kernel lacks runtime superblock summary adjustment support"); 160 } 161 cmd.version = FFS_CMD_VERSION; 162 cmd.handle = fsreadfd; 163 fswritefd = -1; 164 } 165 if (preen == 0) 166 printf("** %s", dev); 167 if (bkgrdflag == 0 && 168 (nflag || (fswritefd = open(dev, O_WRONLY)) < 0)) { 169 fswritefd = -1; 170 if (preen) 171 pfatal("NO WRITE ACCESS"); 172 printf(" (NO WRITE)"); 173 } 174 if (preen == 0) 175 printf("\n"); 176 /* 177 * Read in the superblock, looking for alternates if necessary 178 */ 179 if (readsb(1) == 0) { 180 skipclean = 0; 181 if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0) 182 return(0); 183 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0) 184 return (0); 185 for (cg = 0; cg < proto.fs_ncg; cg++) { 186 bflag = fsbtodb(&proto, cgsblock(&proto, cg)); 187 if (readsb(0) != 0) 188 break; 189 } 190 if (cg >= proto.fs_ncg) { 191 printf("%s %s\n%s %s\n%s %s\n", 192 "SEARCH FOR ALTERNATE SUPER-BLOCK", 193 "FAILED. YOU MUST USE THE", 194 "-b OPTION TO FSCK TO SPECIFY THE", 195 "LOCATION OF AN ALTERNATE", 196 "SUPER-BLOCK TO SUPPLY NEEDED", 197 "INFORMATION; SEE fsck(8)."); 198 bflag = 0; 199 return(0); 200 } 201 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag); 202 bflag = 0; 203 } 204 if (skipclean && preen && sblock.fs_clean) { 205 pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n"); 206 return (-1); 207 } 208 maxfsblock = sblock.fs_size; 209 maxino = sblock.fs_ncg * sblock.fs_ipg; 210 /* 211 * Check and potentially fix certain fields in the super block. 212 */ 213 if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) { 214 pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK"); 215 if (reply("SET TO DEFAULT") == 1) { 216 sblock.fs_optim = FS_OPTTIME; 217 sbdirty(); 218 } 219 } 220 if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) { 221 pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK", 222 sblock.fs_minfree); 223 if (reply("SET TO DEFAULT") == 1) { 224 sblock.fs_minfree = 10; 225 sbdirty(); 226 } 227 } 228 if (sblock.fs_magic == FS_UFS1_MAGIC && 229 sblock.fs_old_inodefmt < FS_44INODEFMT) { 230 pwarn("Format of file system is too old.\n"); 231 pwarn("Must update to modern format using a version of fsck\n"); 232 pfatal("from before 2002 with the command ``fsck -c 2''\n"); 233 exit(EEXIT); 234 } 235 if (asblk.b_dirty && !bflag) { 236 memmove(&altsblock, &sblock, (size_t)sblock.fs_sbsize); 237 flush(fswritefd, &asblk); 238 } 239 /* 240 * read in the summary info. 241 */ 242 asked = 0; 243 sblock.fs_csp = calloc(1, sblock.fs_cssize); 244 if (sblock.fs_csp == NULL) { 245 printf("cannot alloc %u bytes for cg summary info\n", 246 (unsigned)sblock.fs_cssize); 247 goto badsb; 248 } 249 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 250 size = sblock.fs_cssize - i < sblock.fs_bsize ? 251 sblock.fs_cssize - i : sblock.fs_bsize; 252 if (bread(fsreadfd, (char *)sblock.fs_csp + i, 253 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 254 size) != 0 && !asked) { 255 pfatal("BAD SUMMARY INFORMATION"); 256 if (reply("CONTINUE") == 0) { 257 ckfini(0); 258 exit(EEXIT); 259 } 260 asked++; 261 } 262 } 263 /* 264 * allocate and initialize the necessary maps 265 */ 266 bmapsize = roundup(howmany(maxfsblock, CHAR_BIT), sizeof(short)); 267 blockmap = calloc((unsigned)bmapsize, sizeof (char)); 268 if (blockmap == NULL) { 269 printf("cannot alloc %u bytes for blockmap\n", 270 (unsigned)bmapsize); 271 goto badsb; 272 } 273 inostathead = calloc((unsigned)(sblock.fs_ncg), 274 sizeof(struct inostatlist)); 275 if (inostathead == NULL) { 276 printf("cannot alloc %u bytes for inostathead\n", 277 (unsigned)(sizeof(struct inostatlist) * (sblock.fs_ncg))); 278 goto badsb; 279 } 280 numdirs = MAX(sblock.fs_cstotal.cs_ndir, 128); 281 dirhash = numdirs; 282 inplast = 0; 283 listmax = numdirs + 10; 284 inpsort = (struct inoinfo **)calloc((unsigned)listmax, 285 sizeof(struct inoinfo *)); 286 inphead = (struct inoinfo **)calloc((unsigned)numdirs, 287 sizeof(struct inoinfo *)); 288 if (inpsort == NULL || inphead == NULL) { 289 printf("cannot alloc %ju bytes for inphead\n", 290 (uintmax_t)numdirs * sizeof(struct inoinfo *)); 291 goto badsb; 292 } 293 bufinit(); 294 if (sblock.fs_flags & FS_DOSOFTDEP) 295 usedsoftdep = 1; 296 else 297 usedsoftdep = 0; 298 return (1); 299 300badsb: 301 ckfini(0); 302 return (0); 303} 304 305/* 306 * Possible superblock locations ordered from most to least likely. 307 */ 308static int sblock_try[] = SBLOCKSEARCH; 309 310#define BAD_MAGIC_MSG \ 311"The previous newfs operation on this volume did not complete.\n" \ 312"You must complete newfs before mounting this volume.\n" 313 314/* 315 * Read in the super block and its summary info. 316 */ 317int 318readsb(int listerr) 319{ 320 ufs2_daddr_t super; 321 int i; 322 323 if (bflag) { 324 super = bflag; 325 if ((bread(fsreadfd, (char *)&sblock, super, (long)SBLOCKSIZE))) 326 return (0); 327 if (sblock.fs_magic == FS_BAD_MAGIC) { 328 fprintf(stderr, BAD_MAGIC_MSG); 329 exit(11); 330 } 331 if (sblock.fs_magic != FS_UFS1_MAGIC && 332 sblock.fs_magic != FS_UFS2_MAGIC) { 333 fprintf(stderr, "%d is not a file system superblock\n", 334 bflag); 335 return (0); 336 } 337 } else { 338 for (i = 0; sblock_try[i] != -1; i++) { 339 super = sblock_try[i] / dev_bsize; 340 if ((bread(fsreadfd, (char *)&sblock, super, 341 (long)SBLOCKSIZE))) 342 return (0); 343 if (sblock.fs_magic == FS_BAD_MAGIC) { 344 fprintf(stderr, BAD_MAGIC_MSG); 345 exit(11); 346 } 347 if ((sblock.fs_magic == FS_UFS1_MAGIC || 348 (sblock.fs_magic == FS_UFS2_MAGIC && 349 sblock.fs_sblockloc == sblock_try[i])) && 350 sblock.fs_ncg >= 1 && 351 sblock.fs_bsize >= MINBSIZE && 352 sblock.fs_bsize >= sizeof(struct fs)) 353 break; 354 } 355 if (sblock_try[i] == -1) { 356 fprintf(stderr, "Cannot find file system superblock\n"); 357 return (0); 358 } 359 } 360 /* 361 * Compute block size that the file system is based on, 362 * according to fsbtodb, and adjust superblock block number 363 * so we can tell if this is an alternate later. 364 */ 365 super *= dev_bsize; 366 dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1); 367 sblk.b_bno = super / dev_bsize; 368 sblk.b_size = SBLOCKSIZE; 369 if (bflag) 370 goto out; 371 /* 372 * Compare all fields that should not differ in alternate super block. 373 * When an alternate super-block is specified this check is skipped. 374 */ 375 getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize); 376 if (asblk.b_errs) 377 return (0); 378 if (altsblock.fs_sblkno != sblock.fs_sblkno || 379 altsblock.fs_cblkno != sblock.fs_cblkno || 380 altsblock.fs_iblkno != sblock.fs_iblkno || 381 altsblock.fs_dblkno != sblock.fs_dblkno || 382 altsblock.fs_ncg != sblock.fs_ncg || 383 altsblock.fs_bsize != sblock.fs_bsize || 384 altsblock.fs_fsize != sblock.fs_fsize || 385 altsblock.fs_frag != sblock.fs_frag || 386 altsblock.fs_bmask != sblock.fs_bmask || 387 altsblock.fs_fmask != sblock.fs_fmask || 388 altsblock.fs_bshift != sblock.fs_bshift || 389 altsblock.fs_fshift != sblock.fs_fshift || 390 altsblock.fs_fragshift != sblock.fs_fragshift || 391 altsblock.fs_fsbtodb != sblock.fs_fsbtodb || 392 altsblock.fs_sbsize != sblock.fs_sbsize || 393 altsblock.fs_nindir != sblock.fs_nindir || 394 altsblock.fs_inopb != sblock.fs_inopb || 395 altsblock.fs_cssize != sblock.fs_cssize || 396 altsblock.fs_ipg != sblock.fs_ipg || 397 altsblock.fs_fpg != sblock.fs_fpg || 398 altsblock.fs_magic != sblock.fs_magic) { 399 badsb(listerr, 400 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE"); 401 return (0); 402 } 403out: 404 /* 405 * If not yet done, update UFS1 superblock with new wider fields. 406 */ 407 if (sblock.fs_magic == FS_UFS1_MAGIC && 408 sblock.fs_maxbsize != sblock.fs_bsize) { 409 sblock.fs_maxbsize = sblock.fs_bsize; 410 sblock.fs_time = sblock.fs_old_time; 411 sblock.fs_size = sblock.fs_old_size; 412 sblock.fs_dsize = sblock.fs_old_dsize; 413 sblock.fs_csaddr = sblock.fs_old_csaddr; 414 sblock.fs_cstotal.cs_ndir = sblock.fs_old_cstotal.cs_ndir; 415 sblock.fs_cstotal.cs_nbfree = sblock.fs_old_cstotal.cs_nbfree; 416 sblock.fs_cstotal.cs_nifree = sblock.fs_old_cstotal.cs_nifree; 417 sblock.fs_cstotal.cs_nffree = sblock.fs_old_cstotal.cs_nffree; 418 } 419 havesb = 1; 420 return (1); 421} 422 423static void 424badsb(int listerr, const char *s) 425{ 426 427 if (!listerr) 428 return; 429 if (preen) 430 printf("%s: ", cdevname); 431 pfatal("BAD SUPER BLOCK: %s\n", s); 432} 433 434void 435sblock_init(void) 436{ 437 struct disklabel *lp; 438 439 fswritefd = -1; 440 fsmodified = 0; 441 lfdir = 0; 442 initbarea(&sblk); 443 initbarea(&asblk); 444 sblk.b_un.b_buf = malloc(SBLOCKSIZE); 445 asblk.b_un.b_buf = malloc(SBLOCKSIZE); 446 if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL) 447 errx(EEXIT, "cannot allocate space for superblock"); 448 if ((lp = getdisklabel(NULL, fsreadfd))) 449 dev_bsize = secsize = lp->d_secsize; 450 else 451 dev_bsize = secsize = DEV_BSIZE; 452} 453 454/* 455 * Calculate a prototype superblock based on information in the disk label. 456 * When done the cgsblock macro can be calculated and the fs_ncg field 457 * can be used. Do NOT attempt to use other macros without verifying that 458 * their needed information is available! 459 */ 460static int 461calcsb(char *dev, int devfd, struct fs *fs) 462{ 463 struct disklabel *lp; 464 struct partition *pp; 465 char *cp; 466 int i, nspf; 467 468 cp = strchr(dev, '\0') - 1; 469 if (cp == (char *)-1 || ((*cp < 'a' || *cp > 'h') && !isdigit(*cp))) { 470 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev); 471 return (0); 472 } 473 lp = getdisklabel(dev, devfd); 474 if (isdigit(*cp)) 475 pp = &lp->d_partitions[0]; 476 else 477 pp = &lp->d_partitions[*cp - 'a']; 478 if (pp->p_fstype != FS_BSDFFS) { 479 pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n", 480 dev, pp->p_fstype < FSMAXTYPES ? 481 fstypenames[pp->p_fstype] : "unknown"); 482 return (0); 483 } 484 if (pp->p_fsize == 0 || pp->p_frag == 0 || 485 pp->p_cpg == 0 || pp->p_size == 0) { 486 pfatal("%s: %s: type %s fsize %d, frag %d, cpg %d, size %d\n", 487 dev, "INCOMPLETE LABEL", fstypenames[pp->p_fstype], 488 pp->p_fsize, pp->p_frag, pp->p_cpg, pp->p_size); 489 return (0); 490 } 491 memset(fs, 0, sizeof(struct fs)); 492 fs->fs_fsize = pp->p_fsize; 493 fs->fs_frag = pp->p_frag; 494 fs->fs_size = pp->p_size; 495 fs->fs_sblkno = roundup( 496 howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize), 497 fs->fs_frag); 498 nspf = fs->fs_fsize / lp->d_secsize; 499 for (fs->fs_fsbtodb = 0, i = nspf; i > 1; i >>= 1) 500 fs->fs_fsbtodb++; 501 dev_bsize = lp->d_secsize; 502 if (fs->fs_magic == FS_UFS2_MAGIC) { 503 fs->fs_fpg = pp->p_cpg; 504 fs->fs_ncg = howmany(fs->fs_size, fs->fs_fpg); 505 } else /* if (fs->fs_magic == FS_UFS1_MAGIC) */ { 506 fs->fs_old_cpg = pp->p_cpg; 507 fs->fs_old_cgmask = 0xffffffff; 508 for (i = lp->d_ntracks; i > 1; i >>= 1) 509 fs->fs_old_cgmask <<= 1; 510 if (!POWEROF2(lp->d_ntracks)) 511 fs->fs_old_cgmask <<= 1; 512 fs->fs_old_cgoffset = roundup(howmany(lp->d_nsectors, nspf), 513 fs->fs_frag); 514 fs->fs_fpg = (fs->fs_old_cpg * lp->d_secpercyl) / nspf; 515 fs->fs_ncg = howmany(fs->fs_size / lp->d_secpercyl, 516 fs->fs_old_cpg); 517 } 518 return (1); 519} 520 521static struct disklabel * 522getdisklabel(char *s, int fd) 523{ 524 static struct disklabel lab; 525 526 if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) { 527 if (s == NULL) 528 return ((struct disklabel *)NULL); 529 pwarn("ioctl (GCINFO): %s\n", strerror(errno)); 530 errx(EEXIT, "%s: can't read disk label", s); 531 } 532 return (&lab); 533} 534