main.c revision 187501
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 187501 2009-01-20 22:49:49Z delphij $"); 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 damagedflag = 0; 85 while ((ch = getopt(argc, argv, "b:Bc:dDfFm: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 'D': 110 damagedflag = 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 cylno; 210 ino_t files; 211 size_t size; 212 213 iov = NULL; 214 iovlen = 0; 215 errmsg[0] = '\0'; 216 217 cdevname = filesys; 218 if (debug && preen) 219 pwarn("starting\n"); 220 /* 221 * Make best effort to get the disk name. Check first to see 222 * if it is listed among the mounted file systems. Failing that 223 * check to see if it is listed in /etc/fstab. 224 */ 225 mntp = getmntpt(filesys); 226 if (mntp != NULL) 227 filesys = mntp->f_mntfromname; 228 else 229 filesys = blockcheck(filesys); 230 /* 231 * If -F flag specified, check to see whether a background check 232 * is possible and needed. If possible and needed, exit with 233 * status zero. Otherwise exit with status non-zero. A non-zero 234 * exit status will cause a foreground check to be run. 235 */ 236 sblock_init(); 237 if (bkgrdcheck) { 238 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0) 239 exit(3); /* Cannot read superblock */ 240 close(fsreadfd); 241 if (sblock.fs_flags & FS_NEEDSFSCK) 242 exit(4); /* Earlier background failed */ 243 if ((sblock.fs_flags & FS_DOSOFTDEP) == 0) 244 exit(5); /* Not running soft updates */ 245 size = MIBSIZE; 246 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0) 247 exit(6); /* Lacks kernel support */ 248 if ((mntp == NULL && sblock.fs_clean == 1) || 249 (mntp != NULL && (sblock.fs_flags & FS_UNCLEAN) == 0)) 250 exit(7); /* Filesystem clean, report it now */ 251 exit(0); 252 } 253 if (preen && skipclean) { 254 /* 255 * If file system is gjournaled, check it here. 256 */ 257 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0) 258 exit(3); /* Cannot read superblock */ 259 close(fsreadfd); 260 if ((sblock.fs_flags & FS_GJOURNAL) != 0) { 261 //printf("GJournaled file system detected on %s.\n", 262 // filesys); 263 if (sblock.fs_clean == 1) { 264 pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n"); 265 exit(0); 266 } 267 if ((sblock.fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) == 0) { 268 gjournal_check(filesys); 269 if (chkdoreload(mntp) == 0) 270 exit(0); 271 exit(4); 272 } else { 273 pfatal("UNEXPECTED INCONSISTENCY, %s\n", 274 "CANNOT RUN FAST FSCK\n"); 275 } 276 } 277 } 278 /* 279 * If we are to do a background check: 280 * Get the mount point information of the file system 281 * create snapshot file 282 * return created snapshot file 283 * if not found, clear bkgrdflag and proceed with normal fsck 284 */ 285 if (bkgrdflag) { 286 if (mntp == NULL) { 287 bkgrdflag = 0; 288 pfatal("NOT MOUNTED, CANNOT RUN IN BACKGROUND\n"); 289 } else if ((mntp->f_flags & MNT_SOFTDEP) == 0) { 290 bkgrdflag = 0; 291 pfatal("NOT USING SOFT UPDATES, %s\n", 292 "CANNOT RUN IN BACKGROUND"); 293 } else if ((mntp->f_flags & MNT_RDONLY) != 0) { 294 bkgrdflag = 0; 295 pfatal("MOUNTED READ-ONLY, CANNOT RUN IN BACKGROUND\n"); 296 } else if ((fsreadfd = open(filesys, O_RDONLY)) >= 0) { 297 if (readsb(0) != 0) { 298 if (sblock.fs_flags & FS_NEEDSFSCK) { 299 bkgrdflag = 0; 300 pfatal("UNEXPECTED INCONSISTENCY, %s\n", 301 "CANNOT RUN IN BACKGROUND\n"); 302 } 303 if ((sblock.fs_flags & FS_UNCLEAN) == 0 && 304 skipclean && preen) { 305 /* 306 * file system is clean; 307 * skip snapshot and report it clean 308 */ 309 pwarn("FILE SYSTEM CLEAN; %s\n", 310 "SKIPPING CHECKS"); 311 goto clean; 312 } 313 } 314 close(fsreadfd); 315 } 316 if (bkgrdflag) { 317 snprintf(snapname, sizeof snapname, "%s/.snap", 318 mntp->f_mntonname); 319 if (stat(snapname, &snapdir) < 0) { 320 if (errno != ENOENT) { 321 bkgrdflag = 0; 322 pfatal("CANNOT FIND %s %s: %s, %s\n", 323 "SNAPSHOT DIRECTORY", 324 snapname, strerror(errno), 325 "CANNOT RUN IN BACKGROUND"); 326 } else if ((grp = getgrnam("operator")) == 0 || 327 mkdir(snapname, 0770) < 0 || 328 chown(snapname, -1, grp->gr_gid) < 0 || 329 chmod(snapname, 0770) < 0) { 330 bkgrdflag = 0; 331 pfatal("CANNOT CREATE %s %s: %s, %s\n", 332 "SNAPSHOT DIRECTORY", 333 snapname, strerror(errno), 334 "CANNOT RUN IN BACKGROUND"); 335 } 336 } else if (!S_ISDIR(snapdir.st_mode)) { 337 bkgrdflag = 0; 338 pfatal("%s IS NOT A DIRECTORY, %s\n", snapname, 339 "CANNOT RUN IN BACKGROUND"); 340 } 341 } 342 if (bkgrdflag) { 343 snprintf(snapname, sizeof snapname, 344 "%s/.snap/fsck_snapshot", mntp->f_mntonname); 345 build_iovec(&iov, &iovlen, "fstype", "ffs", 4); 346 build_iovec(&iov, &iovlen, "from", snapname, 347 (size_t)-1); 348 build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname, 349 (size_t)-1); 350 build_iovec(&iov, &iovlen, "errmsg", errmsg, 351 sizeof(errmsg)); 352 build_iovec(&iov, &iovlen, "update", NULL, 0); 353 build_iovec(&iov, &iovlen, "snapshot", NULL, 0); 354 355 while (nmount(iov, iovlen, mntp->f_flags) < 0) { 356 if (errno == EEXIST && unlink(snapname) == 0) 357 continue; 358 bkgrdflag = 0; 359 pfatal("CANNOT CREATE SNAPSHOT %s: %s %s\n", 360 snapname, strerror(errno), errmsg); 361 break; 362 } 363 if (bkgrdflag != 0) 364 filesys = snapname; 365 } 366 } 367 368 switch (setup(filesys)) { 369 case 0: 370 if (preen) 371 pfatal("CAN'T CHECK FILE SYSTEM."); 372 return (0); 373 case -1: 374 clean: 375 pwarn("clean, %ld free ", (long)(sblock.fs_cstotal.cs_nffree + 376 sblock.fs_frag * sblock.fs_cstotal.cs_nbfree)); 377 printf("(%lld frags, %lld blocks, %.1f%% fragmentation)\n", 378 (long long)sblock.fs_cstotal.cs_nffree, 379 (long long)sblock.fs_cstotal.cs_nbfree, 380 sblock.fs_cstotal.cs_nffree * 100.0 / sblock.fs_dsize); 381 return (0); 382 } 383 384 /* 385 * Cleared if any questions answered no. Used to decide if 386 * the superblock should be marked clean. 387 */ 388 resolved = 1; 389 /* 390 * 1: scan inodes tallying blocks used 391 */ 392 if (preen == 0) { 393 printf("** Last Mounted on %s\n", sblock.fs_fsmnt); 394 if (mntp != NULL && mntp->f_flags & MNT_ROOTFS) 395 printf("** Root file system\n"); 396 printf("** Phase 1 - Check Blocks and Sizes\n"); 397 } 398 pass1(); 399 400 /* 401 * 1b: locate first references to duplicates, if any 402 */ 403 if (duplist) { 404 if (preen || usedsoftdep) 405 pfatal("INTERNAL ERROR: dups with -p"); 406 printf("** Phase 1b - Rescan For More DUPS\n"); 407 pass1b(); 408 } 409 410 /* 411 * 2: traverse directories from root to mark all connected directories 412 */ 413 if (preen == 0) 414 printf("** Phase 2 - Check Pathnames\n"); 415 pass2(); 416 417 /* 418 * 3: scan inodes looking for disconnected directories 419 */ 420 if (preen == 0) 421 printf("** Phase 3 - Check Connectivity\n"); 422 pass3(); 423 424 /* 425 * 4: scan inodes looking for disconnected files; check reference counts 426 */ 427 if (preen == 0) 428 printf("** Phase 4 - Check Reference Counts\n"); 429 pass4(); 430 431 /* 432 * 5: check and repair resource counts in cylinder groups 433 */ 434 if (preen == 0) 435 printf("** Phase 5 - Check Cyl groups\n"); 436 pass5(); 437 438 /* 439 * print out summary statistics 440 */ 441 n_ffree = sblock.fs_cstotal.cs_nffree; 442 n_bfree = sblock.fs_cstotal.cs_nbfree; 443 files = maxino - ROOTINO - sblock.fs_cstotal.cs_nifree - n_files; 444 blks = n_blks + 445 sblock.fs_ncg * (cgdmin(&sblock, 0) - cgsblock(&sblock, 0)); 446 blks += cgsblock(&sblock, 0) - cgbase(&sblock, 0); 447 blks += howmany(sblock.fs_cssize, sblock.fs_fsize); 448 blks = maxfsblock - (n_ffree + sblock.fs_frag * n_bfree) - blks; 449 if (bkgrdflag && (files > 0 || blks > 0)) { 450 countdirs = sblock.fs_cstotal.cs_ndir - countdirs; 451 pwarn("Reclaimed: %ld directories, %ld files, %lld fragments\n", 452 countdirs, (long)files - countdirs, (long long)blks); 453 } 454 pwarn("%ld files, %jd used, %ju free ", 455 (long)n_files, (intmax_t)n_blks, 456 (uintmax_t)n_ffree + sblock.fs_frag * n_bfree); 457 printf("(%ju frags, %ju blocks, %.1f%% fragmentation)\n", 458 (uintmax_t)n_ffree, (uintmax_t)n_bfree, 459 n_ffree * 100.0 / sblock.fs_dsize); 460 if (debug) { 461 if (files < 0) 462 printf("%d inodes missing\n", -files); 463 if (blks < 0) 464 printf("%lld blocks missing\n", -(long long)blks); 465 if (duplist != NULL) { 466 printf("The following duplicate blocks remain:"); 467 for (dp = duplist; dp; dp = dp->next) 468 printf(" %lld,", (long long)dp->dup); 469 printf("\n"); 470 } 471 } 472 duplist = (struct dups *)0; 473 muldup = (struct dups *)0; 474 inocleanup(); 475 if (fsmodified) { 476 sblock.fs_time = time(NULL); 477 sbdirty(); 478 } 479 if (cvtlevel && sblk.b_dirty) { 480 /* 481 * Write out the duplicate super blocks 482 */ 483 for (cylno = 0; cylno < sblock.fs_ncg; cylno++) 484 blwrite(fswritefd, (char *)&sblock, 485 fsbtodb(&sblock, cgsblock(&sblock, cylno)), 486 SBLOCKSIZE); 487 } 488 if (rerun) 489 resolved = 0; 490 491 /* 492 * Check to see if the file system is mounted read-write. 493 */ 494 if (bkgrdflag == 0 && mntp != NULL && (mntp->f_flags & MNT_RDONLY) == 0) 495 resolved = 0; 496 ckfini(resolved); 497 498 for (cylno = 0; cylno < sblock.fs_ncg; cylno++) 499 if (inostathead[cylno].il_stat != NULL) 500 free((char *)inostathead[cylno].il_stat); 501 free((char *)inostathead); 502 inostathead = NULL; 503 if (fsmodified && !preen) 504 printf("\n***** FILE SYSTEM WAS MODIFIED *****\n"); 505 if (rerun) 506 printf("\n***** PLEASE RERUN FSCK *****\n"); 507 if (chkdoreload(mntp) != 0) { 508 if (!fsmodified) 509 return (0); 510 if (!preen) 511 printf("\n***** REBOOT NOW *****\n"); 512 sync(); 513 return (4); 514 } 515 return (0); 516} 517 518static int 519chkdoreload(struct statfs *mntp) 520{ 521 struct iovec *iov; 522 int iovlen; 523 char errmsg[255]; 524 525 if (mntp == NULL) 526 return (0); 527 528 iov = NULL; 529 iovlen = 0; 530 errmsg[0] = '\0'; 531 /* 532 * We modified a mounted file system. Do a mount update on 533 * it unless it is read-write, so we can continue using it 534 * as safely as possible. 535 */ 536 if (mntp->f_flags & MNT_RDONLY) { 537 build_iovec(&iov, &iovlen, "fstype", "ffs", 4); 538 build_iovec(&iov, &iovlen, "from", mntp->f_mntfromname, 539 (size_t)-1); 540 build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname, 541 (size_t)-1); 542 build_iovec(&iov, &iovlen, "errmsg", errmsg, 543 sizeof(errmsg)); 544 build_iovec(&iov, &iovlen, "update", NULL, 0); 545 build_iovec(&iov, &iovlen, "reload", NULL, 0); 546 /* 547 * XX: We need the following line until we clean up 548 * nmount parsing of root mounts and NFS root mounts. 549 */ 550 build_iovec(&iov, &iovlen, "ro", NULL, 0); 551 if (nmount(iov, iovlen, mntp->f_flags) == 0) { 552 return (0); 553 } 554 pwarn("mount reload of '%s' failed: %s %s\n\n", 555 mntp->f_mntonname, strerror(errno), errmsg); 556 return (1); 557 } 558 return (0); 559} 560 561/* 562 * Get the mount point information for name. 563 */ 564static struct statfs * 565getmntpt(const char *name) 566{ 567 struct stat devstat, mntdevstat; 568 char device[sizeof(_PATH_DEV) - 1 + MNAMELEN]; 569 char *ddevname; 570 struct statfs *mntbuf, *statfsp; 571 int i, mntsize, isdev; 572 573 if (stat(name, &devstat) != 0) 574 return (NULL); 575 if (S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode)) 576 isdev = 1; 577 else 578 isdev = 0; 579 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 580 for (i = 0; i < mntsize; i++) { 581 statfsp = &mntbuf[i]; 582 ddevname = statfsp->f_mntfromname; 583 if (*ddevname != '/') { 584 strcpy(device, _PATH_DEV); 585 strcat(device, ddevname); 586 strcpy(statfsp->f_mntfromname, device); 587 } 588 if (isdev == 0) { 589 if (strcmp(name, statfsp->f_mntonname)) 590 continue; 591 return (statfsp); 592 } 593 if (stat(ddevname, &mntdevstat) == 0 && 594 mntdevstat.st_rdev == devstat.st_rdev) 595 return (statfsp); 596 } 597 statfsp = NULL; 598 return (statfsp); 599} 600 601static void 602usage(void) 603{ 604 (void) fprintf(stderr, 605 "usage: %s [-BCFpfny] [-b block] [-c level] [-m mode] " 606 "filesystem ...\n", 607 getprogname()); 608 exit(1); 609} 610