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