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 IN_RTLD /* So we pickup the P_OSREL defines */ 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 static int chkdoreload(struct statfs *mntp); 80 static struct statfs *getmntpt(const char *); 81 82 int 83 main(int argc, char *argv[]) 84 { 85 int ch; 86 struct rlimit rlimit; 87 struct itimerval itimerval; 88 int fsret; 89 int ret = 0; 90 91 sync(); 92 skipclean = 1; 93 inoopt = 0; 94 while ((ch = getopt(argc, argv, "b:Bc:CdEfFm:npRrSyZz")) != -1) { 95 switch (ch) { 96 case 'b': 97 skipclean = 0; 98 bflag = argtoimax('b', "number", optarg, 10); 99 printf("Alternate super block location: %jd\n", bflag); 100 break; 101 102 case 'B': 103 bkgrdflag = 1; 104 break; 105 106 case 'c': 107 skipclean = 0; 108 cvtlevel = argtoimax('c', "conversion level", optarg, 109 10); 110 if (cvtlevel < 3) 111 errx(EEXIT, "cannot do level %d conversion", 112 cvtlevel); 113 break; 114 115 case 'd': 116 debug++; 117 break; 118 119 case 'E': 120 Eflag++; 121 break; 122 123 case 'f': 124 skipclean = 0; 125 break; 126 127 case 'F': 128 bkgrdcheck = 1; 129 break; 130 131 case 'm': 132 lfmode = argtoimax('m', "mode", optarg, 8); 133 if (lfmode &~ 07777) 134 errx(EEXIT, "bad mode to -m: %o", lfmode); 135 printf("** lost+found creation mode %o\n", lfmode); 136 break; 137 138 case 'n': 139 nflag++; 140 yflag = 0; 141 break; 142 143 case 'p': 144 preen++; 145 /*FALLTHROUGH*/ 146 147 case 'C': 148 ckclean++; 149 break; 150 151 case 'R': 152 wantrestart = 1; 153 break; 154 case 'r': 155 inoopt++; 156 break; 157 158 case 'S': 159 surrender = 1; 160 break; 161 162 case 'y': 163 yflag++; 164 nflag = 0; 165 break; 166 167 case 'Z': 168 Zflag++; 169 break; 170 171 case 'z': 172 zflag++; 173 break; 174 175 default: 176 usage(); 177 } 178 } 179 argc -= optind; 180 argv += optind; 181 182 if (!argc) 183 usage(); 184 185 if (bkgrdflag && cvtlevel > 0) { 186 pfatal("CANNOT CONVERT A SNAPSHOT\n"); 187 exit(EEXIT); 188 } 189 190 if (signal(SIGINT, SIG_IGN) != SIG_IGN) 191 (void)signal(SIGINT, catch); 192 if (ckclean) 193 (void)signal(SIGQUIT, catchquit); 194 signal(SIGINFO, infohandler); 195 if (bkgrdflag) { 196 signal(SIGALRM, alarmhandler); 197 itimerval.it_interval.tv_sec = 5; 198 itimerval.it_interval.tv_usec = 0; 199 itimerval.it_value.tv_sec = 5; 200 itimerval.it_value.tv_usec = 0; 201 setitimer(ITIMER_REAL, &itimerval, NULL); 202 } 203 /* 204 * Push up our allowed memory limit so we can cope 205 * with huge file systems. 206 */ 207 if (getrlimit(RLIMIT_DATA, &rlimit) == 0) { 208 rlimit.rlim_cur = rlimit.rlim_max; 209 (void)setrlimit(RLIMIT_DATA, &rlimit); 210 } 211 while (argc > 0) { 212 if ((fsret = checkfilesys(*argv)) == ERESTART) 213 continue; 214 ret |= fsret; 215 argc--; 216 argv++; 217 } 218 219 if (returntosingle) 220 ret = 2; 221 exit(ret); 222 } 223 224 static intmax_t 225 argtoimax(int flag, const char *req, const char *str, int base) 226 { 227 char *cp; 228 intmax_t ret; 229 230 ret = strtoimax(str, &cp, base); 231 if (cp == str || *cp) 232 errx(EEXIT, "-%c flag requires a %s", flag, req); 233 return (ret); 234 } 235 236 /* 237 * Check the specified file system. 238 */ 239 /* ARGSUSED */ 240 static int 241 checkfilesys(char *filesys) 242 { 243 ufs2_daddr_t n_ffree, n_bfree; 244 struct dups *dp; 245 struct statfs *mntp; 246 intmax_t blks, files; 247 size_t size; 248 int sbreadfailed, ofsmodified; 249 250 fsutilinit(); 251 fsckinit(); 252 253 cdevname = filesys; 254 if (debug && ckclean) 255 pwarn("starting\n"); 256 /* 257 * Make best effort to get the disk name. Check first to see 258 * if it is listed among the mounted file systems. Failing that 259 * check to see if it is listed in /etc/fstab. 260 */ 261 mntp = getmntpt(filesys); 262 if (mntp != NULL) 263 filesys = mntp->f_mntfromname; 264 else 265 filesys = blockcheck(filesys); 266 /* 267 * If -F flag specified, check to see whether a background check 268 * is possible and needed. If possible and needed, exit with 269 * status zero. Otherwise exit with status non-zero. A non-zero 270 * exit status will cause a foreground check to be run. 271 */ 272 sblock_init(); 273 sbreadfailed = 0; 274 if (openfilesys(filesys) == 0 || readsb() == 0) 275 sbreadfailed = 1; 276 if (bkgrdcheck) { 277 if (sbreadfailed) 278 exit(3); /* Cannot read superblock */ 279 /* Earlier background failed or journaled */ 280 if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ)) 281 exit(4); 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) == 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 ((sblock.fs_flags & FS_SUJ) == FS_SUJ) { 356 if ((sblock.fs_flags & FS_NEEDSFSCK) != FS_NEEDSFSCK && skipclean) { 357 sujrecovery = 1; 358 if (suj_check(filesys) == 0) { 359 printf("\n***** FILE SYSTEM MARKED CLEAN *****\n"); 360 if (chkdoreload(mntp) == 0) 361 exit(0); 362 exit(4); 363 } 364 sujrecovery = 0; 365 printf("** Skipping journal, falling through to full fsck\n\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 pass5(); 495 IOstats("Pass5"); 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) != 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 ((sblock.fs_flags & FS_SUJ) != 0) { 616 pwarn("JOURNALED FILESYSTEM, CANNOT RUN IN BACKGROUND\n"); 617 return (0); 618 } 619 if (skipclean && ckclean && 620 (sblock.fs_flags & (FS_UNCLEAN|FS_NEEDSFSCK)) == 0) { 621 /* 622 * file system is clean; 623 * skip snapshot and report it clean 624 */ 625 pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n"); 626 return (-1); 627 } 628 /* Check that kernel supports background fsck */ 629 size = MIBSIZE; 630 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0|| 631 sysctlnametomib("vfs.ffs.adjblkcnt", adjblkcnt, &size) < 0|| 632 sysctlnametomib("vfs.ffs.setsize", setsize, &size) < 0 || 633 sysctlnametomib("vfs.ffs.freefiles", freefiles, &size) < 0|| 634 sysctlnametomib("vfs.ffs.freedirs", freedirs, &size) < 0 || 635 sysctlnametomib("vfs.ffs.freeblks", freeblks, &size) < 0) { 636 pwarn("KERNEL LACKS BACKGROUND FSCK SUPPORT\n"); 637 return (0); 638 } 639 /* 640 * When kernel lacks runtime bgfsck superblock summary 641 * adjustment functionality, it does not mean we can not 642 * continue, as old kernels will recompute the summary at 643 * mount time. However, it will be an unexpected softupdates 644 * inconsistency if it turns out that the summary is still 645 * incorrect. Set a flag so subsequent operation can know this. 646 */ 647 bkgrdsumadj = 1; 648 if (sysctlnametomib("vfs.ffs.adjndir", adjndir, &size) < 0 || 649 sysctlnametomib("vfs.ffs.adjnbfree", adjnbfree, &size) < 0 || 650 sysctlnametomib("vfs.ffs.adjnifree", adjnifree, &size) < 0 || 651 sysctlnametomib("vfs.ffs.adjnffree", adjnffree, &size) < 0 || 652 sysctlnametomib("vfs.ffs.adjnumclusters", adjnumclusters, 653 &size) < 0) { 654 bkgrdsumadj = 0; 655 pwarn("KERNEL LACKS RUNTIME SUPERBLOCK SUMMARY ADJUSTMENT " 656 "SUPPORT\n"); 657 } 658 /* Find or create the snapshot directory */ 659 snprintf(snapname, sizeof snapname, "%s/.snap", 660 mntp->f_mntonname); 661 if (stat(snapname, &snapdir) < 0) { 662 if (errno != ENOENT) { 663 pwarn("CANNOT FIND SNAPSHOT DIRECTORY %s: %s, CANNOT " 664 "RUN IN BACKGROUND\n", snapname, strerror(errno)); 665 return (0); 666 } 667 if ((grp = getgrnam("operator")) == NULL || 668 mkdir(snapname, 0770) < 0 || 669 chown(snapname, -1, grp->gr_gid) < 0 || 670 chmod(snapname, 0770) < 0) { 671 pwarn("CANNOT CREATE SNAPSHOT DIRECTORY %s: %s, " 672 "CANNOT RUN IN BACKGROUND\n", snapname, 673 strerror(errno)); 674 return (0); 675 } 676 } else if (!S_ISDIR(snapdir.st_mode)) { 677 pwarn("%s IS NOT A DIRECTORY, CANNOT RUN IN BACKGROUND\n", 678 snapname); 679 return (0); 680 } 681 /* Create the snapshot file */ 682 iov = NULL; 683 iovlen = 0; 684 errmsg[0] = '\0'; 685 snprintf(snapname, sizeof snapname, "%s/.snap/fsck_snapshot", 686 mntp->f_mntonname); 687 build_iovec(&iov, &iovlen, "fstype", "ffs", 4); 688 build_iovec(&iov, &iovlen, "from", snapname, (size_t)-1); 689 build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname, (size_t)-1); 690 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg)); 691 build_iovec(&iov, &iovlen, "update", NULL, 0); 692 build_iovec(&iov, &iovlen, "snapshot", NULL, 0); 693 /* Create snapshot, removing old snapshot if it exists */ 694 while (nmount(iov, iovlen, mntp->f_flags) < 0) { 695 if (errno == EEXIST && unlink(snapname) == 0) 696 continue; 697 pwarn("CANNOT CREATE SNAPSHOT %s: %s %s\n", snapname, 698 strerror(errno), errmsg); 699 return (0); 700 } 701 /* Open snapshot */ 702 if (openfilesys(snapname) == 0) { 703 unlink(snapname); 704 pwarn("CANNOT OPEN SNAPSHOT %s: %s, CANNOT RUN IN " 705 "BACKGROUND\n", snapname, strerror(errno)); 706 return (0); 707 } 708 free(sblock.fs_csp); 709 free(sblock.fs_si); 710 havesb = 0; 711 *filesys = snapname; 712 cmd.version = FFS_CMD_VERSION; 713 cmd.handle = fsreadfd; 714 return (1); 715 } 716 717 static int 718 chkdoreload(struct statfs *mntp) 719 { 720 struct iovec *iov; 721 int iovlen; 722 char errmsg[255]; 723 724 if (mntp == NULL) 725 return (0); 726 727 iov = NULL; 728 iovlen = 0; 729 errmsg[0] = '\0'; 730 /* 731 * We modified a mounted file system. Do a mount update on 732 * it unless it is read-write, so we can continue using it 733 * as safely as possible. 734 */ 735 if (mntp->f_flags & MNT_RDONLY) { 736 build_iovec(&iov, &iovlen, "fstype", "ffs", 4); 737 build_iovec(&iov, &iovlen, "from", mntp->f_mntfromname, 738 (size_t)-1); 739 build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname, 740 (size_t)-1); 741 build_iovec(&iov, &iovlen, "errmsg", errmsg, 742 sizeof(errmsg)); 743 build_iovec(&iov, &iovlen, "update", NULL, 0); 744 build_iovec(&iov, &iovlen, "reload", NULL, 0); 745 /* 746 * XX: We need the following line until we clean up 747 * nmount parsing of root mounts and NFS root mounts. 748 */ 749 build_iovec(&iov, &iovlen, "ro", NULL, 0); 750 if (nmount(iov, iovlen, mntp->f_flags) == 0) { 751 return (0); 752 } 753 pwarn("mount reload of '%s' failed: %s %s\n\n", 754 mntp->f_mntonname, strerror(errno), errmsg); 755 return (1); 756 } 757 return (0); 758 } 759 760 /* 761 * Get the mount point information for name. 762 */ 763 static struct statfs * 764 getmntpt(const char *name) 765 { 766 struct stat devstat, mntdevstat; 767 char device[sizeof(_PATH_DEV) - 1 + MNAMELEN]; 768 char *ddevname; 769 struct statfs *mntbuf, *statfsp; 770 int i, mntsize, isdev; 771 772 if (stat(name, &devstat) != 0) 773 return (NULL); 774 if (S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode)) 775 isdev = 1; 776 else 777 isdev = 0; 778 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 779 for (i = 0; i < mntsize; i++) { 780 statfsp = &mntbuf[i]; 781 ddevname = statfsp->f_mntfromname; 782 if (*ddevname != '/') { 783 if (strlen(_PATH_DEV) + strlen(ddevname) + 1 > 784 sizeof(statfsp->f_mntfromname)) 785 continue; 786 strcpy(device, _PATH_DEV); 787 strcat(device, ddevname); 788 strcpy(statfsp->f_mntfromname, device); 789 } 790 if (isdev == 0) { 791 if (strcmp(name, statfsp->f_mntonname)) 792 continue; 793 return (statfsp); 794 } 795 if (stat(ddevname, &mntdevstat) == 0 && 796 mntdevstat.st_rdev == devstat.st_rdev) 797 return (statfsp); 798 } 799 statfsp = NULL; 800 return (statfsp); 801 } 802 803 static void 804 usage(void) 805 { 806 (void) fprintf(stderr, 807 "usage: %s [-BCdEFfnpRrSyZ] [-b block] [-c level] [-m mode] filesystem ...\n", 808 getprogname()); 809 exit(1); 810 } 811 812 void 813 infohandler(int sig __unused) 814 { 815 got_siginfo = 1; 816 } 817 818 void 819 alarmhandler(int sig __unused) 820 { 821 got_sigalarm = 1; 822 } 823