main.c revision 176822
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 176822 2008-03-05 08:25:49Z 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 while ((ch = getopt(argc, argv, "b:Bc:dfFm:npy")) != -1) { 85 switch (ch) { 86 case 'b': 87 skipclean = 0; 88 bflag = argtoi('b', "number", optarg, 10); 89 printf("Alternate super block location: %d\n", bflag); 90 break; 91 92 case 'B': 93 bkgrdflag = 1; 94 break; 95 96 case 'c': 97 skipclean = 0; 98 cvtlevel = argtoi('c', "conversion level", optarg, 10); 99 if (cvtlevel < 3) 100 errx(EEXIT, "cannot do level %d conversion", 101 cvtlevel); 102 break; 103 104 case 'd': 105 debug++; 106 break; 107 108 case 'f': 109 skipclean = 0; 110 break; 111 112 case 'F': 113 bkgrdcheck = 1; 114 break; 115 116 case 'm': 117 lfmode = argtoi('m', "mode", optarg, 8); 118 if (lfmode &~ 07777) 119 errx(EEXIT, "bad mode to -m: %o", lfmode); 120 printf("** lost+found creation mode %o\n", lfmode); 121 break; 122 123 case 'n': 124 nflag++; 125 yflag = 0; 126 break; 127 128 case 'p': 129 preen++; 130 break; 131 132 case 'y': 133 yflag++; 134 nflag = 0; 135 break; 136 137 default: 138 usage(); 139 } 140 } 141 argc -= optind; 142 argv += optind; 143 144 if (!argc) 145 usage(); 146 147 if (signal(SIGINT, SIG_IGN) != SIG_IGN) 148 (void)signal(SIGINT, catch); 149 if (preen) 150 (void)signal(SIGQUIT, catchquit); 151 signal(SIGINFO, infohandler); 152 if (bkgrdflag) { 153 signal(SIGALRM, alarmhandler); 154 itimerval.it_interval.tv_sec = 5; 155 itimerval.it_interval.tv_usec = 0; 156 itimerval.it_value.tv_sec = 5; 157 itimerval.it_value.tv_usec = 0; 158 setitimer(ITIMER_REAL, &itimerval, NULL); 159 } 160 /* 161 * Push up our allowed memory limit so we can cope 162 * with huge file systems. 163 */ 164 if (getrlimit(RLIMIT_DATA, &rlimit) == 0) { 165 rlimit.rlim_cur = rlimit.rlim_max; 166 (void)setrlimit(RLIMIT_DATA, &rlimit); 167 } 168 while (argc-- > 0) 169 (void)checkfilesys(*argv++); 170 171 if (returntosingle) 172 ret = 2; 173 exit(ret); 174} 175 176static int 177argtoi(int flag, const char *req, const char *str, int base) 178{ 179 char *cp; 180 int ret; 181 182 ret = (int)strtol(str, &cp, base); 183 if (cp == str || *cp) 184 errx(EEXIT, "-%c flag requires a %s", flag, req); 185 return (ret); 186} 187 188/* 189 * Check the specified file system. 190 */ 191/* ARGSUSED */ 192static int 193checkfilesys(char *filesys) 194{ 195 ufs2_daddr_t n_ffree, n_bfree; 196 struct dups *dp; 197 struct statfs *mntp; 198 struct stat snapdir; 199 struct group *grp; 200 ufs2_daddr_t blks; 201 struct iovec *iov; 202 char errmsg[255]; 203 int iovlen; 204 int fflags; 205 int cylno; 206 ino_t files; 207 size_t size; 208 209 iov = NULL; 210 iovlen = 0; 211 errmsg[0] = '\0'; 212 213 cdevname = filesys; 214 if (debug && preen) 215 pwarn("starting\n"); 216 /* 217 * Make best effort to get the disk name. Check first to see 218 * if it is listed among the mounted file systems. Failing that 219 * check to see if it is listed in /etc/fstab. 220 */ 221 mntp = getmntpt(filesys); 222 if (mntp != NULL) 223 filesys = mntp->f_mntfromname; 224 else 225 filesys = blockcheck(filesys); 226 /* 227 * If -F flag specified, check to see whether a background check 228 * is possible and needed. If possible and needed, exit with 229 * status zero. Otherwise exit with status non-zero. A non-zero 230 * exit status will cause a foreground check to be run. 231 */ 232 sblock_init(); 233 if (bkgrdcheck) { 234 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0) 235 exit(3); /* Cannot read superblock */ 236 close(fsreadfd); 237 if (sblock.fs_flags & FS_NEEDSFSCK) 238 exit(4); /* Earlier background failed */ 239 if ((sblock.fs_flags & FS_DOSOFTDEP) == 0) 240 exit(5); /* Not running soft updates */ 241 size = MIBSIZE; 242 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0) 243 exit(6); /* Lacks kernel support */ 244 if ((mntp == NULL && sblock.fs_clean == 1) || 245 (mntp != NULL && (sblock.fs_flags & FS_UNCLEAN) == 0)) 246 exit(7); /* Filesystem clean, report it now */ 247 exit(0); 248 } 249 if (preen && skipclean) { 250 /* 251 * If file system is gjournaled, check it here. 252 */ 253 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0) 254 exit(3); /* Cannot read superblock */ 255 close(fsreadfd); 256 if ((sblock.fs_flags & FS_GJOURNAL) != 0) { 257 //printf("GJournaled file system detected on %s.\n", 258 // filesys); 259 if (sblock.fs_clean == 1) { 260 pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n"); 261 exit(0); 262 } 263 if ((sblock.fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) == 0) { 264 gjournal_check(filesys); 265 if (chkdoreload(mntp) == 0) 266 exit(0); 267 exit(4); 268 } else { 269 pfatal("UNEXPECTED INCONSISTENCY, %s\n", 270 "CANNOT RUN FAST FSCK\n"); 271 } 272 } 273 } 274 /* 275 * If we are to do a background check: 276 * Get the mount point information of the file system 277 * create snapshot file 278 * return created snapshot file 279 * if not found, clear bkgrdflag and proceed with normal fsck 280 */ 281 if (bkgrdflag) { 282 if (mntp == NULL) { 283 bkgrdflag = 0; 284 pfatal("NOT MOUNTED, CANNOT RUN IN BACKGROUND\n"); 285 } else if ((mntp->f_flags & MNT_SOFTDEP) == 0) { 286 bkgrdflag = 0; 287 pfatal("NOT USING SOFT UPDATES, %s\n", 288 "CANNOT RUN IN BACKGROUND"); 289 } else if ((mntp->f_flags & MNT_RDONLY) != 0) { 290 bkgrdflag = 0; 291 pfatal("MOUNTED READ-ONLY, CANNOT RUN IN BACKGROUND\n"); 292 } else if ((fsreadfd = open(filesys, O_RDONLY)) >= 0) { 293 if (readsb(0) != 0) { 294 if (sblock.fs_flags & FS_NEEDSFSCK) { 295 bkgrdflag = 0; 296 pfatal("UNEXPECTED INCONSISTENCY, %s\n", 297 "CANNOT RUN IN BACKGROUND\n"); 298 } 299 if ((sblock.fs_flags & FS_UNCLEAN) == 0 && 300 skipclean && preen) { 301 /* 302 * file system is clean; 303 * skip snapshot and report it clean 304 */ 305 pwarn("FILE SYSTEM CLEAN; %s\n", 306 "SKIPPING CHECKS"); 307 goto clean; 308 } 309 } 310 close(fsreadfd); 311 } 312 if (bkgrdflag) { 313 snprintf(snapname, sizeof snapname, "%s/.snap", 314 mntp->f_mntonname); 315 if (stat(snapname, &snapdir) < 0) { 316 if (errno != ENOENT) { 317 bkgrdflag = 0; 318 pfatal("CANNOT FIND %s %s: %s, %s\n", 319 "SNAPSHOT DIRECTORY", 320 snapname, strerror(errno), 321 "CANNOT RUN IN BACKGROUND"); 322 } else if ((grp = getgrnam("operator")) == 0 || 323 mkdir(snapname, 0770) < 0 || 324 chown(snapname, -1, grp->gr_gid) < 0 || 325 chmod(snapname, 0770) < 0) { 326 bkgrdflag = 0; 327 pfatal("CANNOT CREATE %s %s: %s, %s\n", 328 "SNAPSHOT DIRECTORY", 329 snapname, strerror(errno), 330 "CANNOT RUN IN BACKGROUND"); 331 } 332 } else if (!S_ISDIR(snapdir.st_mode)) { 333 bkgrdflag = 0; 334 pfatal("%s IS NOT A DIRECTORY, %s\n", snapname, 335 "CANNOT RUN IN BACKGROUND"); 336 } 337 } 338 if (bkgrdflag) { 339 snprintf(snapname, sizeof snapname, 340 "%s/.snap/fsck_snapshot", mntp->f_mntonname); 341 fflags = mntp->f_flags; 342 fflags = fflags | MNT_UPDATE | MNT_SNAPSHOT; 343 build_iovec(&iov, &iovlen, "fstype", "ffs", 4); 344 build_iovec(&iov, &iovlen, "from", snapname, 345 (size_t)-1); 346 build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname, 347 (size_t)-1); 348 build_iovec(&iov, &iovlen, "errmsg", errmsg, 349 sizeof(errmsg)); 350 351 while (nmount(iov, iovlen, fflags) < 0) { 352 if (errno == EEXIST && unlink(snapname) == 0) 353 continue; 354 bkgrdflag = 0; 355 pfatal("CANNOT CREATE SNAPSHOT %s: %s %s\n", 356 snapname, strerror(errno), errmsg); 357 break; 358 } 359 if (bkgrdflag != 0) 360 filesys = snapname; 361 } 362 } 363 364 switch (setup(filesys)) { 365 case 0: 366 if (preen) 367 pfatal("CAN'T CHECK FILE SYSTEM."); 368 return (0); 369 case -1: 370 clean: 371 pwarn("clean, %ld free ", (long)(sblock.fs_cstotal.cs_nffree + 372 sblock.fs_frag * sblock.fs_cstotal.cs_nbfree)); 373 printf("(%lld frags, %lld blocks, %.1f%% fragmentation)\n", 374 (long long)sblock.fs_cstotal.cs_nffree, 375 (long long)sblock.fs_cstotal.cs_nbfree, 376 sblock.fs_cstotal.cs_nffree * 100.0 / sblock.fs_dsize); 377 return (0); 378 } 379 380 /* 381 * Cleared if any questions answered no. Used to decide if 382 * the superblock should be marked clean. 383 */ 384 resolved = 1; 385 /* 386 * 1: scan inodes tallying blocks used 387 */ 388 if (preen == 0) { 389 printf("** Last Mounted on %s\n", sblock.fs_fsmnt); 390 if (mntp != NULL && mntp->f_flags & MNT_ROOTFS) 391 printf("** Root file system\n"); 392 printf("** Phase 1 - Check Blocks and Sizes\n"); 393 } 394 pass1(); 395 396 /* 397 * 1b: locate first references to duplicates, if any 398 */ 399 if (duplist) { 400 if (preen || usedsoftdep) 401 pfatal("INTERNAL ERROR: dups with -p"); 402 printf("** Phase 1b - Rescan For More DUPS\n"); 403 pass1b(); 404 } 405 406 /* 407 * 2: traverse directories from root to mark all connected directories 408 */ 409 if (preen == 0) 410 printf("** Phase 2 - Check Pathnames\n"); 411 pass2(); 412 413 /* 414 * 3: scan inodes looking for disconnected directories 415 */ 416 if (preen == 0) 417 printf("** Phase 3 - Check Connectivity\n"); 418 pass3(); 419 420 /* 421 * 4: scan inodes looking for disconnected files; check reference counts 422 */ 423 if (preen == 0) 424 printf("** Phase 4 - Check Reference Counts\n"); 425 pass4(); 426 427 /* 428 * 5: check and repair resource counts in cylinder groups 429 */ 430 if (preen == 0) 431 printf("** Phase 5 - Check Cyl groups\n"); 432 pass5(); 433 434 /* 435 * print out summary statistics 436 */ 437 n_ffree = sblock.fs_cstotal.cs_nffree; 438 n_bfree = sblock.fs_cstotal.cs_nbfree; 439 files = maxino - ROOTINO - sblock.fs_cstotal.cs_nifree - n_files; 440 blks = n_blks + 441 sblock.fs_ncg * (cgdmin(&sblock, 0) - cgsblock(&sblock, 0)); 442 blks += cgsblock(&sblock, 0) - cgbase(&sblock, 0); 443 blks += howmany(sblock.fs_cssize, sblock.fs_fsize); 444 blks = maxfsblock - (n_ffree + sblock.fs_frag * n_bfree) - blks; 445 if (bkgrdflag && (files > 0 || blks > 0)) { 446 countdirs = sblock.fs_cstotal.cs_ndir - countdirs; 447 pwarn("Reclaimed: %ld directories, %ld files, %lld fragments\n", 448 countdirs, (long)files - countdirs, (long long)blks); 449 } 450 pwarn("%ld files, %jd used, %ju free ", 451 (long)n_files, (intmax_t)n_blks, 452 (uintmax_t)n_ffree + sblock.fs_frag * n_bfree); 453 printf("(%ju frags, %ju blocks, %.1f%% fragmentation)\n", 454 (uintmax_t)n_ffree, (uintmax_t)n_bfree, 455 n_ffree * 100.0 / sblock.fs_dsize); 456 if (debug) { 457 if (files < 0) 458 printf("%d inodes missing\n", -files); 459 if (blks < 0) 460 printf("%lld blocks missing\n", -(long long)blks); 461 if (duplist != NULL) { 462 printf("The following duplicate blocks remain:"); 463 for (dp = duplist; dp; dp = dp->next) 464 printf(" %lld,", (long long)dp->dup); 465 printf("\n"); 466 } 467 } 468 duplist = (struct dups *)0; 469 muldup = (struct dups *)0; 470 inocleanup(); 471 if (fsmodified) { 472 sblock.fs_time = time(NULL); 473 sbdirty(); 474 } 475 if (cvtlevel && sblk.b_dirty) { 476 /* 477 * Write out the duplicate super blocks 478 */ 479 for (cylno = 0; cylno < sblock.fs_ncg; cylno++) 480 blwrite(fswritefd, (char *)&sblock, 481 fsbtodb(&sblock, cgsblock(&sblock, cylno)), 482 SBLOCKSIZE); 483 } 484 if (rerun) 485 resolved = 0; 486 487 /* 488 * Check to see if the file system is mounted read-write. 489 */ 490 if (bkgrdflag == 0 && mntp != NULL && (mntp->f_flags & MNT_RDONLY) == 0) 491 resolved = 0; 492 ckfini(resolved); 493 494 for (cylno = 0; cylno < sblock.fs_ncg; cylno++) 495 if (inostathead[cylno].il_stat != NULL) 496 free((char *)inostathead[cylno].il_stat); 497 free((char *)inostathead); 498 inostathead = NULL; 499 if (fsmodified && !preen) 500 printf("\n***** FILE SYSTEM WAS MODIFIED *****\n"); 501 if (rerun) 502 printf("\n***** PLEASE RERUN FSCK *****\n"); 503 if (chkdoreload(mntp) != 0) { 504 if (!fsmodified) 505 return (0); 506 if (!preen) 507 printf("\n***** REBOOT NOW *****\n"); 508 sync(); 509 return (4); 510 } 511 return (0); 512} 513 514static int 515chkdoreload(struct statfs *mntp) 516{ 517 struct iovec *iov; 518 int iovlen; 519 int fflags; 520 char errmsg[255]; 521 522 if (mntp == NULL) 523 return (0); 524 525 iov = NULL; 526 iovlen = 0; 527 errmsg[0] = '\0'; 528 fflags = mntp->f_flags; 529 /* 530 * We modified a mounted file system. Do a mount update on 531 * it unless it is read-write, so we can continue using it 532 * as safely as possible. 533 */ 534 if (mntp->f_flags & MNT_RDONLY) { 535 fflags = fflags | MNT_RELOAD; 536 build_iovec(&iov, &iovlen, "fstype", "ffs", 4); 537 build_iovec(&iov, &iovlen, "from", mntp->f_mntfromname, 538 (size_t)-1); 539 build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname, 540 (size_t)-1); 541 build_iovec(&iov, &iovlen, "errmsg", errmsg, 542 sizeof(errmsg)); 543 build_iovec(&iov, &iovlen, "update", NULL, 0); 544 build_iovec(&iov, &iovlen, "ro", NULL, 0); 545 if (nmount(iov, iovlen, fflags) == 0) { 546 return (0); 547 } 548 pwarn("mount reload of '%s' failed: %s %s\n\n", 549 mntp->f_mntonname, strerror(errno), errmsg); 550 return (1); 551 } 552 return (0); 553} 554 555/* 556 * Get the mount point information for name. 557 */ 558static struct statfs * 559getmntpt(const char *name) 560{ 561 struct stat devstat, mntdevstat; 562 char device[sizeof(_PATH_DEV) - 1 + MNAMELEN]; 563 char *ddevname; 564 struct statfs *mntbuf, *statfsp; 565 int i, mntsize, isdev; 566 567 if (stat(name, &devstat) != 0) 568 return (NULL); 569 if (S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode)) 570 isdev = 1; 571 else 572 isdev = 0; 573 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 574 for (i = 0; i < mntsize; i++) { 575 statfsp = &mntbuf[i]; 576 ddevname = statfsp->f_mntfromname; 577 if (*ddevname != '/') { 578 strcpy(device, _PATH_DEV); 579 strcat(device, ddevname); 580 strcpy(statfsp->f_mntfromname, device); 581 } 582 if (isdev == 0) { 583 if (strcmp(name, statfsp->f_mntonname)) 584 continue; 585 return (statfsp); 586 } 587 if (stat(ddevname, &mntdevstat) == 0 && 588 mntdevstat.st_rdev == devstat.st_rdev) 589 return (statfsp); 590 } 591 statfsp = NULL; 592 return (statfsp); 593} 594 595static void 596usage(void) 597{ 598 (void) fprintf(stderr, 599 "usage: %s [-BFpfny] [-b block] [-c level] [-m mode] " 600 "filesystem ...\n", 601 getprogname()); 602 exit(1); 603} 604