main.c revision 182027
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 copyright[] = 33"@(#) Copyright (c) 1980, 1986, 1993\n\ 34 The Regents of the University of California. All rights reserved.\n"; 35#endif /* not lint */ 36 37#ifndef lint 38static char sccsid[] = "@(#)main.c 8.6 (Berkeley) 5/14/95"; 39#endif /* not lint */ 40#endif 41#include <sys/cdefs.h> 42__FBSDID("$FreeBSD: head/sbin/fsck_ffs/main.c 182027 2008-08-23 01:21:10Z rodrigc $"); 43 44#include <sys/param.h> 45#include <sys/stat.h> 46#include <sys/file.h> 47#include <sys/time.h> 48#include <sys/mount.h> 49#include <sys/resource.h> 50#include <sys/sysctl.h> 51#include <sys/uio.h> 52#include <sys/disklabel.h> 53 54#include <ufs/ufs/dinode.h> 55#include <ufs/ffs/fs.h> 56 57#include <err.h> 58#include <errno.h> 59#include <fstab.h> 60#include <grp.h> 61#include <mntopts.h> 62#include <paths.h> 63#include <stdint.h> 64#include <string.h> 65 66#include "fsck.h" 67 68static void usage(void) __dead2; 69static int argtoi(int flag, const char *req, const char *str, int base); 70static int checkfilesys(char *filesys); 71static int chkdoreload(struct statfs *mntp); 72static struct statfs *getmntpt(const char *); 73 74int 75main(int argc, char *argv[]) 76{ 77 int ch; 78 struct rlimit rlimit; 79 struct itimerval itimerval; 80 int ret = 0; 81 82 sync(); 83 skipclean = 1; 84 catastrophicflag = 0; 85 while ((ch = getopt(argc, argv, "b:Bc:CdfFm:npy")) != -1) { 86 switch (ch) { 87 case 'b': 88 skipclean = 0; 89 bflag = argtoi('b', "number", optarg, 10); 90 printf("Alternate super block location: %d\n", bflag); 91 break; 92 93 case 'B': 94 bkgrdflag = 1; 95 break; 96 97 case 'c': 98 skipclean = 0; 99 cvtlevel = argtoi('c', "conversion level", optarg, 10); 100 if (cvtlevel < 3) 101 errx(EEXIT, "cannot do level %d conversion", 102 cvtlevel); 103 break; 104 105 case 'd': 106 debug++; 107 break; 108 109 case 'C': 110 catastrophicflag = 1; 111 /* FALLTHROUGH */ 112 113 case 'f': 114 skipclean = 0; 115 break; 116 117 case 'F': 118 bkgrdcheck = 1; 119 break; 120 121 case 'm': 122 lfmode = argtoi('m', "mode", optarg, 8); 123 if (lfmode &~ 07777) 124 errx(EEXIT, "bad mode to -m: %o", lfmode); 125 printf("** lost+found creation mode %o\n", lfmode); 126 break; 127 128 case 'n': 129 nflag++; 130 yflag = 0; 131 break; 132 133 case 'p': 134 preen++; 135 break; 136 137 case 'y': 138 yflag++; 139 nflag = 0; 140 break; 141 142 default: 143 usage(); 144 } 145 } 146 argc -= optind; 147 argv += optind; 148 149 if (!argc) 150 usage(); 151 152 if (signal(SIGINT, SIG_IGN) != SIG_IGN) 153 (void)signal(SIGINT, catch); 154 if (preen) 155 (void)signal(SIGQUIT, catchquit); 156 signal(SIGINFO, infohandler); 157 if (bkgrdflag) { 158 signal(SIGALRM, alarmhandler); 159 itimerval.it_interval.tv_sec = 5; 160 itimerval.it_interval.tv_usec = 0; 161 itimerval.it_value.tv_sec = 5; 162 itimerval.it_value.tv_usec = 0; 163 setitimer(ITIMER_REAL, &itimerval, NULL); 164 } 165 /* 166 * Push up our allowed memory limit so we can cope 167 * with huge file systems. 168 */ 169 if (getrlimit(RLIMIT_DATA, &rlimit) == 0) { 170 rlimit.rlim_cur = rlimit.rlim_max; 171 (void)setrlimit(RLIMIT_DATA, &rlimit); 172 } 173 while (argc-- > 0) 174 (void)checkfilesys(*argv++); 175 176 if (returntosingle) 177 ret = 2; 178 exit(ret); 179} 180 181static int 182argtoi(int flag, const char *req, const char *str, int base) 183{ 184 char *cp; 185 int ret; 186 187 ret = (int)strtol(str, &cp, base); 188 if (cp == str || *cp) 189 errx(EEXIT, "-%c flag requires a %s", flag, req); 190 return (ret); 191} 192 193/* 194 * Check the specified file system. 195 */ 196/* ARGSUSED */ 197static int 198checkfilesys(char *filesys) 199{ 200 ufs2_daddr_t n_ffree, n_bfree; 201 struct dups *dp; 202 struct statfs *mntp; 203 struct stat snapdir; 204 struct group *grp; 205 ufs2_daddr_t blks; 206 struct iovec *iov; 207 char errmsg[255]; 208 int iovlen; 209 int fflags; 210 int cylno; 211 ino_t files; 212 size_t size; 213 214 iov = NULL; 215 iovlen = 0; 216 errmsg[0] = '\0'; 217 218 cdevname = filesys; 219 if (debug && preen) 220 pwarn("starting\n"); 221 /* 222 * Make best effort to get the disk name. Check first to see 223 * if it is listed among the mounted file systems. Failing that 224 * check to see if it is listed in /etc/fstab. 225 */ 226 mntp = getmntpt(filesys); 227 if (mntp != NULL) 228 filesys = mntp->f_mntfromname; 229 else 230 filesys = blockcheck(filesys); 231 /* 232 * If -F flag specified, check to see whether a background check 233 * is possible and needed. If possible and needed, exit with 234 * status zero. Otherwise exit with status non-zero. A non-zero 235 * exit status will cause a foreground check to be run. 236 */ 237 sblock_init(); 238 if (bkgrdcheck) { 239 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0) 240 exit(3); /* Cannot read superblock */ 241 close(fsreadfd); 242 if (sblock.fs_flags & FS_NEEDSFSCK) 243 exit(4); /* Earlier background failed */ 244 if ((sblock.fs_flags & FS_DOSOFTDEP) == 0) 245 exit(5); /* Not running soft updates */ 246 size = MIBSIZE; 247 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0) 248 exit(6); /* Lacks kernel support */ 249 if ((mntp == NULL && sblock.fs_clean == 1) || 250 (mntp != NULL && (sblock.fs_flags & FS_UNCLEAN) == 0)) 251 exit(7); /* Filesystem clean, report it now */ 252 exit(0); 253 } 254 if (preen && skipclean) { 255 /* 256 * If file system is gjournaled, check it here. 257 */ 258 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0) 259 exit(3); /* Cannot read superblock */ 260 close(fsreadfd); 261 if ((sblock.fs_flags & FS_GJOURNAL) != 0) { 262 //printf("GJournaled file system detected on %s.\n", 263 // filesys); 264 if (sblock.fs_clean == 1) { 265 pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n"); 266 exit(0); 267 } 268 if ((sblock.fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) == 0) { 269 gjournal_check(filesys); 270 if (chkdoreload(mntp) == 0) 271 exit(0); 272 exit(4); 273 } else { 274 pfatal("UNEXPECTED INCONSISTENCY, %s\n", 275 "CANNOT RUN FAST FSCK\n"); 276 } 277 } 278 } 279 /* 280 * If we are to do a background check: 281 * Get the mount point information of the file system 282 * create snapshot file 283 * return created snapshot file 284 * if not found, clear bkgrdflag and proceed with normal fsck 285 */ 286 if (bkgrdflag) { 287 if (mntp == NULL) { 288 bkgrdflag = 0; 289 pfatal("NOT MOUNTED, CANNOT RUN IN BACKGROUND\n"); 290 } else if ((mntp->f_flags & MNT_SOFTDEP) == 0) { 291 bkgrdflag = 0; 292 pfatal("NOT USING SOFT UPDATES, %s\n", 293 "CANNOT RUN IN BACKGROUND"); 294 } else if ((mntp->f_flags & MNT_RDONLY) != 0) { 295 bkgrdflag = 0; 296 pfatal("MOUNTED READ-ONLY, CANNOT RUN IN BACKGROUND\n"); 297 } else if ((fsreadfd = open(filesys, O_RDONLY)) >= 0) { 298 if (readsb(0) != 0) { 299 if (sblock.fs_flags & FS_NEEDSFSCK) { 300 bkgrdflag = 0; 301 pfatal("UNEXPECTED INCONSISTENCY, %s\n", 302 "CANNOT RUN IN BACKGROUND\n"); 303 } 304 if ((sblock.fs_flags & FS_UNCLEAN) == 0 && 305 skipclean && preen) { 306 /* 307 * file system is clean; 308 * skip snapshot and report it clean 309 */ 310 pwarn("FILE SYSTEM CLEAN; %s\n", 311 "SKIPPING CHECKS"); 312 goto clean; 313 } 314 } 315 close(fsreadfd); 316 } 317 if (bkgrdflag) { 318 snprintf(snapname, sizeof snapname, "%s/.snap", 319 mntp->f_mntonname); 320 if (stat(snapname, &snapdir) < 0) { 321 if (errno != ENOENT) { 322 bkgrdflag = 0; 323 pfatal("CANNOT FIND %s %s: %s, %s\n", 324 "SNAPSHOT DIRECTORY", 325 snapname, strerror(errno), 326 "CANNOT RUN IN BACKGROUND"); 327 } else if ((grp = getgrnam("operator")) == 0 || 328 mkdir(snapname, 0770) < 0 || 329 chown(snapname, -1, grp->gr_gid) < 0 || 330 chmod(snapname, 0770) < 0) { 331 bkgrdflag = 0; 332 pfatal("CANNOT CREATE %s %s: %s, %s\n", 333 "SNAPSHOT DIRECTORY", 334 snapname, strerror(errno), 335 "CANNOT RUN IN BACKGROUND"); 336 } 337 } else if (!S_ISDIR(snapdir.st_mode)) { 338 bkgrdflag = 0; 339 pfatal("%s IS NOT A DIRECTORY, %s\n", snapname, 340 "CANNOT RUN IN BACKGROUND"); 341 } 342 } 343 if (bkgrdflag) { 344 snprintf(snapname, sizeof snapname, 345 "%s/.snap/fsck_snapshot", mntp->f_mntonname); 346 fflags = mntp->f_flags; 347 build_iovec(&iov, &iovlen, "fstype", "ffs", 4); 348 build_iovec(&iov, &iovlen, "from", snapname, 349 (size_t)-1); 350 build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname, 351 (size_t)-1); 352 build_iovec(&iov, &iovlen, "errmsg", errmsg, 353 sizeof(errmsg)); 354 build_iovec(&iov, &iovlen, "update", NULL, 0); 355 build_iovec(&iov, &iovlen, "snapshot", NULL, 0); 356 357 while (nmount(iov, iovlen, fflags) < 0) { 358 if (errno == EEXIST && unlink(snapname) == 0) 359 continue; 360 bkgrdflag = 0; 361 pfatal("CANNOT CREATE SNAPSHOT %s: %s %s\n", 362 snapname, strerror(errno), errmsg); 363 break; 364 } 365 if (bkgrdflag != 0) 366 filesys = snapname; 367 } 368 } 369 370 switch (setup(filesys)) { 371 case 0: 372 if (preen) 373 pfatal("CAN'T CHECK FILE SYSTEM."); 374 return (0); 375 case -1: 376 clean: 377 pwarn("clean, %ld free ", (long)(sblock.fs_cstotal.cs_nffree + 378 sblock.fs_frag * sblock.fs_cstotal.cs_nbfree)); 379 printf("(%lld frags, %lld blocks, %.1f%% fragmentation)\n", 380 (long long)sblock.fs_cstotal.cs_nffree, 381 (long long)sblock.fs_cstotal.cs_nbfree, 382 sblock.fs_cstotal.cs_nffree * 100.0 / sblock.fs_dsize); 383 return (0); 384 } 385 386 /* 387 * Cleared if any questions answered no. Used to decide if 388 * the superblock should be marked clean. 389 */ 390 resolved = 1; 391 /* 392 * 1: scan inodes tallying blocks used 393 */ 394 if (preen == 0) { 395 printf("** Last Mounted on %s\n", sblock.fs_fsmnt); 396 if (mntp != NULL && mntp->f_flags & MNT_ROOTFS) 397 printf("** Root file system\n"); 398 printf("** Phase 1 - Check Blocks and Sizes\n"); 399 } 400 pass1(); 401 402 /* 403 * 1b: locate first references to duplicates, if any 404 */ 405 if (duplist) { 406 if (preen || usedsoftdep) 407 pfatal("INTERNAL ERROR: dups with -p"); 408 printf("** Phase 1b - Rescan For More DUPS\n"); 409 pass1b(); 410 } 411 412 /* 413 * 2: traverse directories from root to mark all connected directories 414 */ 415 if (preen == 0) 416 printf("** Phase 2 - Check Pathnames\n"); 417 pass2(); 418 419 /* 420 * 3: scan inodes looking for disconnected directories 421 */ 422 if (preen == 0) 423 printf("** Phase 3 - Check Connectivity\n"); 424 pass3(); 425 426 /* 427 * 4: scan inodes looking for disconnected files; check reference counts 428 */ 429 if (preen == 0) 430 printf("** Phase 4 - Check Reference Counts\n"); 431 pass4(); 432 433 /* 434 * 5: check and repair resource counts in cylinder groups 435 */ 436 if (preen == 0) 437 printf("** Phase 5 - Check Cyl groups\n"); 438 pass5(); 439 440 /* 441 * print out summary statistics 442 */ 443 n_ffree = sblock.fs_cstotal.cs_nffree; 444 n_bfree = sblock.fs_cstotal.cs_nbfree; 445 files = maxino - ROOTINO - sblock.fs_cstotal.cs_nifree - n_files; 446 blks = n_blks + 447 sblock.fs_ncg * (cgdmin(&sblock, 0) - cgsblock(&sblock, 0)); 448 blks += cgsblock(&sblock, 0) - cgbase(&sblock, 0); 449 blks += howmany(sblock.fs_cssize, sblock.fs_fsize); 450 blks = maxfsblock - (n_ffree + sblock.fs_frag * n_bfree) - blks; 451 if (bkgrdflag && (files > 0 || blks > 0)) { 452 countdirs = sblock.fs_cstotal.cs_ndir - countdirs; 453 pwarn("Reclaimed: %ld directories, %ld files, %lld fragments\n", 454 countdirs, (long)files - countdirs, (long long)blks); 455 } 456 pwarn("%ld files, %jd used, %ju free ", 457 (long)n_files, (intmax_t)n_blks, 458 (uintmax_t)n_ffree + sblock.fs_frag * n_bfree); 459 printf("(%ju frags, %ju blocks, %.1f%% fragmentation)\n", 460 (uintmax_t)n_ffree, (uintmax_t)n_bfree, 461 n_ffree * 100.0 / sblock.fs_dsize); 462 if (debug) { 463 if (files < 0) 464 printf("%d inodes missing\n", -files); 465 if (blks < 0) 466 printf("%lld blocks missing\n", -(long long)blks); 467 if (duplist != NULL) { 468 printf("The following duplicate blocks remain:"); 469 for (dp = duplist; dp; dp = dp->next) 470 printf(" %lld,", (long long)dp->dup); 471 printf("\n"); 472 } 473 } 474 duplist = (struct dups *)0; 475 muldup = (struct dups *)0; 476 inocleanup(); 477 if (fsmodified) { 478 sblock.fs_time = time(NULL); 479 sbdirty(); 480 } 481 if (cvtlevel && sblk.b_dirty) { 482 /* 483 * Write out the duplicate super blocks 484 */ 485 for (cylno = 0; cylno < sblock.fs_ncg; cylno++) 486 blwrite(fswritefd, (char *)&sblock, 487 fsbtodb(&sblock, cgsblock(&sblock, cylno)), 488 SBLOCKSIZE); 489 } 490 if (rerun) 491 resolved = 0; 492 493 /* 494 * Check to see if the file system is mounted read-write. 495 */ 496 if (bkgrdflag == 0 && mntp != NULL && (mntp->f_flags & MNT_RDONLY) == 0) 497 resolved = 0; 498 ckfini(resolved); 499 500 for (cylno = 0; cylno < sblock.fs_ncg; cylno++) 501 if (inostathead[cylno].il_stat != NULL) 502 free((char *)inostathead[cylno].il_stat); 503 free((char *)inostathead); 504 inostathead = NULL; 505 if (fsmodified && !preen) 506 printf("\n***** FILE SYSTEM WAS MODIFIED *****\n"); 507 if (rerun) 508 printf("\n***** PLEASE RERUN FSCK *****\n"); 509 if (chkdoreload(mntp) != 0) { 510 if (!fsmodified) 511 return (0); 512 if (!preen) 513 printf("\n***** REBOOT NOW *****\n"); 514 sync(); 515 return (4); 516 } 517 return (0); 518} 519 520static int 521chkdoreload(struct statfs *mntp) 522{ 523 struct iovec *iov; 524 int iovlen; 525 int fflags; 526 char errmsg[255]; 527 528 if (mntp == NULL) 529 return (0); 530 531 iov = NULL; 532 iovlen = 0; 533 errmsg[0] = '\0'; 534 fflags = mntp->f_flags; 535 /* 536 * We modified a mounted file system. Do a mount update on 537 * it unless it is read-write, so we can continue using it 538 * as safely as possible. 539 */ 540 if (mntp->f_flags & MNT_RDONLY) { 541 build_iovec(&iov, &iovlen, "fstype", "ffs", 4); 542 build_iovec(&iov, &iovlen, "from", mntp->f_mntfromname, 543 (size_t)-1); 544 build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname, 545 (size_t)-1); 546 build_iovec(&iov, &iovlen, "errmsg", errmsg, 547 sizeof(errmsg)); 548 build_iovec(&iov, &iovlen, "update", NULL, 0); 549 build_iovec(&iov, &iovlen, "reload", NULL, 0); 550 /* 551 * XX: We need the following line until we clean up 552 * nmount parsing of root mounts and NFS root mounts. 553 */ 554 build_iovec(&iov, &iovlen, "ro", NULL, 0); 555 if (nmount(iov, iovlen, fflags) == 0) { 556 return (0); 557 } 558 pwarn("mount reload of '%s' failed: %s %s\n\n", 559 mntp->f_mntonname, strerror(errno), errmsg); 560 return (1); 561 } 562 return (0); 563} 564 565/* 566 * Get the mount point information for name. 567 */ 568static struct statfs * 569getmntpt(const char *name) 570{ 571 struct stat devstat, mntdevstat; 572 char device[sizeof(_PATH_DEV) - 1 + MNAMELEN]; 573 char *ddevname; 574 struct statfs *mntbuf, *statfsp; 575 int i, mntsize, isdev; 576 577 if (stat(name, &devstat) != 0) 578 return (NULL); 579 if (S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode)) 580 isdev = 1; 581 else 582 isdev = 0; 583 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 584 for (i = 0; i < mntsize; i++) { 585 statfsp = &mntbuf[i]; 586 ddevname = statfsp->f_mntfromname; 587 if (*ddevname != '/') { 588 strcpy(device, _PATH_DEV); 589 strcat(device, ddevname); 590 strcpy(statfsp->f_mntfromname, device); 591 } 592 if (isdev == 0) { 593 if (strcmp(name, statfsp->f_mntonname)) 594 continue; 595 return (statfsp); 596 } 597 if (stat(ddevname, &mntdevstat) == 0 && 598 mntdevstat.st_rdev == devstat.st_rdev) 599 return (statfsp); 600 } 601 statfsp = NULL; 602 return (statfsp); 603} 604 605static void 606usage(void) 607{ 608 (void) fprintf(stderr, 609 "usage: %s [-BCFpfny] [-b block] [-c level] [-m mode] " 610 "filesystem ...\n", 611 getprogname()); 612 exit(1); 613} 614