1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if 0 33 #ifndef lint 34 static const char copyright[] = 35 "@(#) Copyright (c) 1980, 1986, 1993\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 39 #ifndef lint 40 static char sccsid[] = "@(#)main.c 8.6 (Berkeley) 5/14/95"; 41 #endif /* not lint */ 42 #endif 43 #include <sys/cdefs.h> 44 __FBSDID("$FreeBSD$"); 45 46 #define _WANT_P_OSREL 47 #include <sys/param.h> 48 #include <sys/file.h> 49 #include <sys/mount.h> 50 #include <sys/resource.h> 51 #include <sys/stat.h> 52 #include <sys/sysctl.h> 53 #include <sys/uio.h> 54 #include <sys/disklabel.h> 55 56 #include <ufs/ufs/dinode.h> 57 #include <ufs/ffs/fs.h> 58 59 #include <err.h> 60 #include <errno.h> 61 #include <fstab.h> 62 #include <grp.h> 63 #include <inttypes.h> 64 #include <libufs.h> 65 #include <mntopts.h> 66 #include <paths.h> 67 #include <stdint.h> 68 #include <string.h> 69 #include <time.h> 70 71 #include "fsck.h" 72 73 static int restarts; 74 75 static void usage(void) __dead2; 76 static intmax_t argtoimax(int flag, const char *req, const char *str, int base); 77 static int checkfilesys(char *filesys); 78 static int setup_bkgrdchk(struct statfs *mntp, int sbrdfailed, char **filesys); 79 80 int 81 main(int argc, char *argv[]) 82 { 83 int ch; 84 struct rlimit rlimit; 85 struct itimerval itimerval; 86 int fsret; 87 int ret = 0; 88 89 sync(); 90 skipclean = 1; 91 inoopt = 0; 92 while ((ch = getopt(argc, argv, "b:Bc:CdEfFm:npRrSyZz")) != -1) { 93 switch (ch) { 94 case 'b': 95 skipclean = 0; 96 bflag = argtoimax('b', "number", optarg, 10); 97 printf("Alternate super block location: %jd\n", bflag); 98 break; 99 100 case 'B': 101 bkgrdflag = 1; 102 break; 103 104 case 'c': 105 skipclean = 0; 106 cvtlevel = argtoimax('c', "conversion level", optarg, 107 10); 108 if (cvtlevel < 3) 109 errx(EEXIT, "cannot do level %d conversion", 110 cvtlevel); 111 break; 112 113 case 'd': 114 debug++; 115 break; 116 117 case 'E': 118 Eflag++; 119 break; 120 121 case 'f': 122 skipclean = 0; 123 break; 124 125 case 'F': 126 bkgrdcheck = 1; 127 break; 128 129 case 'm': 130 lfmode = argtoimax('m', "mode", optarg, 8); 131 if (lfmode &~ 07777) 132 errx(EEXIT, "bad mode to -m: %o", lfmode); 133 printf("** lost+found creation mode %o\n", lfmode); 134 break; 135 136 case 'n': 137 nflag++; 138 yflag = 0; 139 break; 140 141 case 'p': 142 preen++; 143 /*FALLTHROUGH*/ 144 145 case 'C': 146 ckclean++; 147 break; 148 149 case 'R': 150 wantrestart = 1; 151 break; 152 case 'r': 153 inoopt++; 154 break; 155 156 case 'S': 157 surrender = 1; 158 break; 159 160 case 'y': 161 yflag++; 162 nflag = 0; 163 break; 164 165 case 'Z': 166 Zflag++; 167 break; 168 169 case 'z': 170 zflag++; 171 break; 172 173 default: 174 usage(); 175 } 176 } 177 argc -= optind; 178 argv += optind; 179 180 if (!argc) 181 usage(); 182 183 if (bkgrdflag && cvtlevel > 0) { 184 pfatal("CANNOT CONVERT A SNAPSHOT\n"); 185 exit(EEXIT); 186 } 187 188 if (signal(SIGINT, SIG_IGN) != SIG_IGN) 189 (void)signal(SIGINT, catch); 190 if (ckclean) 191 (void)signal(SIGQUIT, catchquit); 192 signal(SIGINFO, infohandler); 193 if (bkgrdflag) { 194 signal(SIGALRM, alarmhandler); 195 itimerval.it_interval.tv_sec = 5; 196 itimerval.it_interval.tv_usec = 0; 197 itimerval.it_value.tv_sec = 5; 198 itimerval.it_value.tv_usec = 0; 199 setitimer(ITIMER_REAL, &itimerval, NULL); 200 } 201 /* 202 * Push up our allowed memory limit so we can cope 203 * with huge file systems. 204 */ 205 if (getrlimit(RLIMIT_DATA, &rlimit) == 0) { 206 rlimit.rlim_cur = rlimit.rlim_max; 207 (void)setrlimit(RLIMIT_DATA, &rlimit); 208 } 209 while (argc > 0) { 210 if ((fsret = checkfilesys(*argv)) == ERESTART) 211 continue; 212 ret |= fsret; 213 argc--; 214 argv++; 215 } 216 217 if (returntosingle) 218 ret = 2; 219 exit(ret); 220 } 221 222 static intmax_t 223 argtoimax(int flag, const char *req, const char *str, int base) 224 { 225 char *cp; 226 intmax_t ret; 227 228 ret = strtoimax(str, &cp, base); 229 if (cp == str || *cp) 230 errx(EEXIT, "-%c flag requires a %s", flag, req); 231 return (ret); 232 } 233 234 /* 235 * Check the specified file system. 236 */ 237 /* ARGSUSED */ 238 static int 239 checkfilesys(char *filesys) 240 { 241 ufs2_daddr_t n_ffree, n_bfree; 242 struct dups *dp; 243 struct statfs *mntp; 244 intmax_t blks, files; 245 size_t size; 246 int sbreadfailed, ofsmodified; 247 248 fsutilinit(); 249 fsckinit(); 250 251 cdevname = filesys; 252 if (debug && ckclean) 253 pwarn("starting\n"); 254 /* 255 * Make best effort to get the disk name. Check first to see 256 * if it is listed among the mounted file systems. Failing that 257 * check to see if it is listed in /etc/fstab. 258 */ 259 mntp = getmntpoint(filesys); 260 if (mntp != NULL) 261 filesys = mntp->f_mntfromname; 262 else 263 filesys = blockcheck(filesys); 264 /* 265 * If -F flag specified, check to see whether a background check 266 * is possible and needed. If possible and needed, exit with 267 * status zero. Otherwise exit with status non-zero. A non-zero 268 * exit status will cause a foreground check to be run. 269 */ 270 sblock_init(); 271 sbreadfailed = 0; 272 if (openfilesys(filesys) == 0 || readsb() == 0) 273 sbreadfailed = 1; 274 if (bkgrdcheck) { 275 if (sbreadfailed) 276 exit(3); /* Cannot read superblock */ 277 /* Earlier background failed or journaled */ 278 if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ)) 279 exit(4); 280 if ((sblock.fs_flags & FS_DOSOFTDEP) == 0) 281 exit(5); /* Not running soft updates */ 282 size = MIBSIZE; 283 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0) 284 exit(6); /* Lacks kernel support */ 285 if ((mntp == NULL && sblock.fs_clean == 1) || 286 (mntp != NULL && (sblock.fs_flags & FS_UNCLEAN) == 0)) 287 exit(7); /* Filesystem clean, report it now */ 288 exit(0); 289 } 290 if (ckclean && skipclean) { 291 /* 292 * If file system is gjournaled, check it here. 293 */ 294 if (sbreadfailed) 295 exit(3); /* Cannot read superblock */ 296 if (bkgrdflag == 0 && 297 (nflag || (fswritefd = open(filesys, O_WRONLY)) < 0)) { 298 fswritefd = -1; 299 if (preen) 300 pfatal("NO WRITE ACCESS"); 301 printf(" (NO WRITE)"); 302 } 303 if ((sblock.fs_flags & FS_GJOURNAL) != 0) { 304 if (sblock.fs_clean == 1) { 305 pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n"); 306 exit(0); 307 } 308 if ((sblock.fs_flags & 309 (FS_UNCLEAN | FS_NEEDSFSCK)) == 0) { 310 bufinit(); 311 gjournal_check(filesys); 312 if (chkdoreload(mntp, pwarn) == 0) 313 exit(0); 314 exit(4); 315 } else { 316 pfatal("FULL FSCK NEEDED, CANNOT RUN FAST " 317 "FSCK\n"); 318 } 319 } 320 close(fswritefd); 321 fswritefd = -1; 322 } 323 if (bkgrdflag) { 324 switch (setup_bkgrdchk(mntp, sbreadfailed, &filesys)) { 325 case -1: /* filesystem clean */ 326 goto clean; 327 case 0: /* cannot do background, give up */ 328 exit(EEXIT); 329 case 1: /* doing background check, preen rules apply */ 330 preen = 1; 331 break; 332 } 333 } 334 335 switch (setup(filesys)) { 336 case 0: 337 if (preen) 338 pfatal("CAN'T CHECK FILE SYSTEM."); 339 return (EEXIT); 340 case -1: 341 clean: 342 pwarn("clean, %ld free ", (long)(sblock.fs_cstotal.cs_nffree + 343 sblock.fs_frag * sblock.fs_cstotal.cs_nbfree)); 344 printf("(%jd frags, %jd blocks, %.1f%% fragmentation)\n", 345 (intmax_t)sblock.fs_cstotal.cs_nffree, 346 (intmax_t)sblock.fs_cstotal.cs_nbfree, 347 sblock.fs_cstotal.cs_nffree * 100.0 / sblock.fs_dsize); 348 return (0); 349 } 350 /* 351 * Determine if we can and should do journal recovery. 352 */ 353 if ((sblock.fs_flags & FS_SUJ) == FS_SUJ) { 354 if ((sblock.fs_flags & FS_NEEDSFSCK) != FS_NEEDSFSCK && 355 skipclean) { 356 sujrecovery = 1; 357 if (suj_check(filesys) == 0) { 358 pwarn("\n**** FILE SYSTEM MARKED CLEAN ****\n"); 359 if (chkdoreload(mntp, pwarn) == 0) 360 exit(0); 361 exit(4); 362 } 363 sujrecovery = 0; 364 pwarn("Skipping journal, " 365 "falling through to full fsck\n"); 366 } 367 if (fswritefd != -1) { 368 /* 369 * Write the superblock so we don't try to recover the 370 * journal on another pass. If this is the only change 371 * to the filesystem, we do not want it to be called 372 * out as modified. 373 */ 374 sblock.fs_mtime = time(NULL); 375 sbdirty(); 376 ofsmodified = fsmodified; 377 flush(fswritefd, &sblk); 378 fsmodified = ofsmodified; 379 } 380 } 381 /* 382 * If the filesystem was run on an old kernel that did not 383 * support check hashes, clear the check-hash flags so that 384 * we do not try to verify them. 385 */ 386 if ((sblock.fs_flags & FS_METACKHASH) == 0) 387 sblock.fs_metackhash = 0; 388 /* 389 * If we are running on a kernel that can provide check hashes 390 * that are not yet enabled for the filesystem and we are 391 * running manually without the -y flag, offer to add any 392 * supported check hashes that are not already enabled. 393 */ 394 ckhashadd = 0; 395 if (preen == 0 && yflag == 0 && sblock.fs_magic != FS_UFS1_MAGIC && 396 fswritefd != -1 && getosreldate() >= P_OSREL_CK_CYLGRP) { 397 if ((sblock.fs_metackhash & CK_CYLGRP) == 0 && 398 reply("ADD CYLINDER GROUP CHECK-HASH PROTECTION") != 0) { 399 ckhashadd |= CK_CYLGRP; 400 sblock.fs_metackhash |= CK_CYLGRP; 401 } 402 if ((sblock.fs_metackhash & CK_SUPERBLOCK) == 0 && 403 getosreldate() >= P_OSREL_CK_SUPERBLOCK && 404 reply("ADD SUPERBLOCK CHECK-HASH PROTECTION") != 0) { 405 ckhashadd |= CK_SUPERBLOCK; 406 sblock.fs_metackhash |= CK_SUPERBLOCK; 407 } 408 if ((sblock.fs_metackhash & CK_INODE) == 0 && 409 getosreldate() >= P_OSREL_CK_INODE && 410 reply("ADD INODE CHECK-HASH PROTECTION") != 0) { 411 ckhashadd |= CK_INODE; 412 sblock.fs_metackhash |= CK_INODE; 413 } 414 #ifdef notyet 415 if ((sblock.fs_metackhash & CK_INDIR) == 0 && 416 getosreldate() >= P_OSREL_CK_INDIR && 417 reply("ADD INDIRECT BLOCK CHECK-HASH PROTECTION") != 0) { 418 ckhashadd |= CK_INDIR; 419 sblock.fs_metackhash |= CK_INDIR; 420 } 421 if ((sblock.fs_metackhash & CK_DIR) == 0 && 422 getosreldate() >= P_OSREL_CK_DIR && 423 reply("ADD DIRECTORY CHECK-HASH PROTECTION") != 0) { 424 ckhashadd |= CK_DIR; 425 sblock.fs_metackhash |= CK_DIR; 426 } 427 #endif /* notyet */ 428 if (ckhashadd != 0) { 429 sblock.fs_flags |= FS_METACKHASH; 430 sbdirty(); 431 } 432 } 433 /* 434 * Cleared if any questions answered no. Used to decide if 435 * the superblock should be marked clean. 436 */ 437 resolved = 1; 438 /* 439 * 1: scan inodes tallying blocks used 440 */ 441 if (preen == 0) { 442 printf("** Last Mounted on %s\n", sblock.fs_fsmnt); 443 if (mntp != NULL && mntp->f_flags & MNT_ROOTFS) 444 printf("** Root file system\n"); 445 printf("** Phase 1 - Check Blocks and Sizes\n"); 446 } 447 clock_gettime(CLOCK_REALTIME_PRECISE, &startprog); 448 pass1(); 449 IOstats("Pass1"); 450 451 /* 452 * 1b: locate first references to duplicates, if any 453 */ 454 if (duplist) { 455 if (preen || usedsoftdep) 456 pfatal("INTERNAL ERROR: DUPS WITH %s%s%s", 457 preen ? "-p" : "", 458 (preen && usedsoftdep) ? " AND " : "", 459 usedsoftdep ? "SOFTUPDATES" : ""); 460 printf("** Phase 1b - Rescan For More DUPS\n"); 461 pass1b(); 462 IOstats("Pass1b"); 463 } 464 465 /* 466 * 2: traverse directories from root to mark all connected directories 467 */ 468 if (preen == 0) 469 printf("** Phase 2 - Check Pathnames\n"); 470 pass2(); 471 IOstats("Pass2"); 472 473 /* 474 * 3: scan inodes looking for disconnected directories 475 */ 476 if (preen == 0) 477 printf("** Phase 3 - Check Connectivity\n"); 478 pass3(); 479 IOstats("Pass3"); 480 481 /* 482 * 4: scan inodes looking for disconnected files; check reference counts 483 */ 484 if (preen == 0) 485 printf("** Phase 4 - Check Reference Counts\n"); 486 pass4(); 487 IOstats("Pass4"); 488 489 /* 490 * 5: check and repair resource counts in cylinder groups 491 */ 492 if (preen == 0) 493 printf("** Phase 5 - Check Cyl groups\n"); 494 snapflush(std_checkblkavail); 495 if (cgheader_corrupt) { 496 printf("PHASE 5 SKIPPED DUE TO CORRUPT CYLINDER GROUP " 497 "HEADER(S)\n\n"); 498 } else { 499 pass5(); 500 IOstats("Pass5"); 501 } 502 503 /* 504 * print out summary statistics 505 */ 506 n_ffree = sblock.fs_cstotal.cs_nffree; 507 n_bfree = sblock.fs_cstotal.cs_nbfree; 508 files = maxino - UFS_ROOTINO - sblock.fs_cstotal.cs_nifree - n_files; 509 blks = n_blks + 510 sblock.fs_ncg * (cgdmin(&sblock, 0) - cgsblock(&sblock, 0)); 511 blks += cgsblock(&sblock, 0) - cgbase(&sblock, 0); 512 blks += howmany(sblock.fs_cssize, sblock.fs_fsize); 513 blks = maxfsblock - (n_ffree + sblock.fs_frag * n_bfree) - blks; 514 if (bkgrdflag && (files > 0 || blks > 0)) { 515 countdirs = sblock.fs_cstotal.cs_ndir - countdirs; 516 pwarn("Reclaimed: %ld directories, %jd files, %jd fragments\n", 517 countdirs, files - countdirs, blks); 518 } 519 pwarn("%ld files, %jd used, %ju free ", 520 (long)n_files, (intmax_t)n_blks, 521 (uintmax_t)n_ffree + sblock.fs_frag * n_bfree); 522 printf("(%ju frags, %ju blocks, %.1f%% fragmentation)\n", 523 (uintmax_t)n_ffree, (uintmax_t)n_bfree, 524 n_ffree * 100.0 / sblock.fs_dsize); 525 if (debug) { 526 if (files < 0) 527 printf("%jd inodes missing\n", -files); 528 if (blks < 0) 529 printf("%jd blocks missing\n", -blks); 530 if (duplist != NULL) { 531 printf("The following duplicate blocks remain:"); 532 for (dp = duplist; dp; dp = dp->next) 533 printf(" %jd,", (intmax_t)dp->dup); 534 printf("\n"); 535 } 536 } 537 duplist = (struct dups *)0; 538 muldup = (struct dups *)0; 539 inocleanup(); 540 if (fsmodified) { 541 sblock.fs_time = time(NULL); 542 sbdirty(); 543 } 544 if (cvtlevel && (sblk.b_flags & B_DIRTY) != 0) { 545 /* 546 * Write out the duplicate super blocks 547 */ 548 if (sbput(fswritefd, &sblock, sblock.fs_ncg) == 0) 549 fsmodified = 1; 550 } 551 if (rerun) 552 resolved = 0; 553 554 /* 555 * Check to see if the file system is mounted read-write. 556 */ 557 if (bkgrdflag == 0 && mntp != NULL && (mntp->f_flags & MNT_RDONLY) == 0) 558 resolved = 0; 559 ckfini(resolved); 560 561 if (fsmodified && !preen) 562 printf("\n***** FILE SYSTEM WAS MODIFIED *****\n"); 563 if (rerun) { 564 if (wantrestart && (restarts++ < 10) && 565 (preen || reply("RESTART"))) 566 return (ERESTART); 567 printf("\n***** PLEASE RERUN FSCK *****\n"); 568 } 569 if (chkdoreload(mntp, pwarn) != 0) { 570 if (!fsmodified) 571 return (0); 572 if (!preen) 573 printf("\n***** REBOOT NOW *****\n"); 574 sync(); 575 return (4); 576 } 577 return (rerun ? ERERUN : 0); 578 } 579 580 /* 581 * If we are to do a background check: 582 * Get the mount point information of the file system 583 * If already clean, return -1 584 * Check that kernel supports background fsck 585 * Find or create the snapshot directory 586 * Create the snapshot file 587 * Open snapshot 588 * If anything fails print reason and return 0 which exits 589 */ 590 static int 591 setup_bkgrdchk(struct statfs *mntp, int sbreadfailed, char **filesys) 592 { 593 struct stat snapdir; 594 struct group *grp; 595 struct iovec *iov; 596 char errmsg[255]; 597 int iovlen; 598 size_t size; 599 600 /* Get the mount point information of the file system */ 601 if (mntp == NULL) { 602 pwarn("NOT MOUNTED, CANNOT RUN IN BACKGROUND\n"); 603 return (0); 604 } 605 if ((mntp->f_flags & MNT_RDONLY) != 0) { 606 pwarn("MOUNTED READ-ONLY, CANNOT RUN IN BACKGROUND\n"); 607 return (0); 608 } 609 if ((mntp->f_flags & MNT_SOFTDEP) == 0) { 610 pwarn("NOT USING SOFT UPDATES, CANNOT RUN IN BACKGROUND\n"); 611 return (0); 612 } 613 if (sbreadfailed) { 614 pwarn("SUPERBLOCK READ FAILED, CANNOT RUN IN BACKGROUND\n"); 615 return (0); 616 } 617 if ((sblock.fs_flags & FS_NEEDSFSCK) != 0) { 618 pwarn("FULL FSCK NEEDED, CANNOT RUN IN BACKGROUND\n"); 619 return (0); 620 } 621 if ((sblock.fs_flags & FS_SUJ) != 0) { 622 pwarn("JOURNALED FILESYSTEM, CANNOT RUN IN BACKGROUND\n"); 623 return (0); 624 } 625 if (skipclean && ckclean && 626 (sblock.fs_flags & (FS_UNCLEAN|FS_NEEDSFSCK)) == 0) { 627 /* 628 * file system is clean; 629 * skip snapshot and report it clean 630 */ 631 pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n"); 632 return (-1); 633 } 634 /* Check that kernel supports background fsck */ 635 size = MIBSIZE; 636 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0|| 637 sysctlnametomib("vfs.ffs.adjblkcnt", adjblkcnt, &size) < 0|| 638 sysctlnametomib("vfs.ffs.setsize", setsize, &size) < 0 || 639 sysctlnametomib("vfs.ffs.freefiles", freefiles, &size) < 0|| 640 sysctlnametomib("vfs.ffs.freedirs", freedirs, &size) < 0 || 641 sysctlnametomib("vfs.ffs.freeblks", freeblks, &size) < 0) { 642 pwarn("KERNEL LACKS BACKGROUND FSCK SUPPORT\n"); 643 return (0); 644 } 645 /* 646 * When kernel lacks runtime bgfsck superblock summary 647 * adjustment functionality, it does not mean we can not 648 * continue, as old kernels will recompute the summary at 649 * mount time. However, it will be an unexpected softupdates 650 * inconsistency if it turns out that the summary is still 651 * incorrect. Set a flag so subsequent operation can know this. 652 */ 653 bkgrdsumadj = 1; 654 if (sysctlnametomib("vfs.ffs.adjndir", adjndir, &size) < 0 || 655 sysctlnametomib("vfs.ffs.adjnbfree", adjnbfree, &size) < 0 || 656 sysctlnametomib("vfs.ffs.adjnifree", adjnifree, &size) < 0 || 657 sysctlnametomib("vfs.ffs.adjnffree", adjnffree, &size) < 0 || 658 sysctlnametomib("vfs.ffs.adjnumclusters", adjnumclusters, 659 &size) < 0) { 660 bkgrdsumadj = 0; 661 pwarn("KERNEL LACKS RUNTIME SUPERBLOCK SUMMARY ADJUSTMENT " 662 "SUPPORT\n"); 663 } 664 /* Find or create the snapshot directory */ 665 snprintf(snapname, sizeof snapname, "%s/.snap", 666 mntp->f_mntonname); 667 if (stat(snapname, &snapdir) < 0) { 668 if (errno != ENOENT) { 669 pwarn("CANNOT FIND SNAPSHOT DIRECTORY %s: %s, CANNOT " 670 "RUN IN BACKGROUND\n", snapname, strerror(errno)); 671 return (0); 672 } 673 if ((grp = getgrnam("operator")) == NULL || 674 mkdir(snapname, 0770) < 0 || 675 chown(snapname, -1, grp->gr_gid) < 0 || 676 chmod(snapname, 0770) < 0) { 677 pwarn("CANNOT CREATE SNAPSHOT DIRECTORY %s: %s, " 678 "CANNOT RUN IN BACKGROUND\n", snapname, 679 strerror(errno)); 680 return (0); 681 } 682 } else if (!S_ISDIR(snapdir.st_mode)) { 683 pwarn("%s IS NOT A DIRECTORY, CANNOT RUN IN BACKGROUND\n", 684 snapname); 685 return (0); 686 } 687 /* Create the snapshot file */ 688 iov = NULL; 689 iovlen = 0; 690 errmsg[0] = '\0'; 691 snprintf(snapname, sizeof snapname, "%s/.snap/fsck_snapshot", 692 mntp->f_mntonname); 693 build_iovec(&iov, &iovlen, "fstype", "ffs", 4); 694 build_iovec(&iov, &iovlen, "from", snapname, (size_t)-1); 695 build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname, (size_t)-1); 696 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg)); 697 build_iovec(&iov, &iovlen, "update", NULL, 0); 698 build_iovec(&iov, &iovlen, "snapshot", NULL, 0); 699 /* Create snapshot, removing old snapshot if it exists */ 700 while (nmount(iov, iovlen, mntp->f_flags) < 0) { 701 if (errno == EEXIST && unlink(snapname) == 0) 702 continue; 703 pwarn("CANNOT CREATE SNAPSHOT %s: %s %s\n", snapname, 704 strerror(errno), errmsg); 705 return (0); 706 } 707 /* Open snapshot */ 708 if (openfilesys(snapname) == 0) { 709 unlink(snapname); 710 pwarn("CANNOT OPEN SNAPSHOT %s: %s, CANNOT RUN IN " 711 "BACKGROUND\n", snapname, strerror(errno)); 712 return (0); 713 } 714 free(sblock.fs_csp); 715 free(sblock.fs_si); 716 if (readsb() == 0) { 717 pwarn("CANNOT READ SNAPSHOT SUPERBLOCK\n"); 718 return (0); 719 } 720 *filesys = snapname; 721 cmd.version = FFS_CMD_VERSION; 722 cmd.handle = fsreadfd; 723 return (1); 724 } 725 726 static void 727 usage(void) 728 { 729 (void) fprintf(stderr, 730 "usage: %s [-BCdEFfnpRrSyZ] [-b block] [-c level] [-m mode] filesystem ...\n", 731 getprogname()); 732 exit(1); 733 } 734 735 void 736 infohandler(int sig __unused) 737 { 738 got_siginfo = 1; 739 } 740 741 void 742 alarmhandler(int sig __unused) 743 { 744 got_sigalarm = 1; 745 } 746