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