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
main(int argc,char * argv[])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
argtoimax(int flag,const char * req,const char * str,int base)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
checkfilesys(char * filesys)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
setup_bkgrdchk(struct statfs * mntp,int sbreadfailed,char ** filesys)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
usage(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
infohandler(int sig __unused)727 infohandler(int sig __unused)
728 {
729 got_siginfo = 1;
730 }
731
732 void
alarmhandler(int sig __unused)733 alarmhandler(int sig __unused)
734 {
735 got_sigalarm = 1;
736 }
737