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fsck.c revision 1.49 
      1 /*	$NetBSD: fsck.c,v 1.49 2010/02/24 13:56:07 hannken Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1996 Christos Zoulas. All rights reserved.
      5  * Copyright (c) 1980, 1989, 1993, 1994
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. Neither the name of the University nor the names of its contributors
     17  *    may be used to endorse or promote products derived from this software
     18  *    without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     30  * SUCH DAMAGE.
     31  *
     32  * From: @(#)mount.c	8.19 (Berkeley) 4/19/94
     33  * From: NetBSD: mount.c,v 1.24 1995/11/18 03:34:29 cgd Exp
     34  *
     35  */
     36 
     37 #include <sys/cdefs.h>
     38 #ifndef lint
     39 __RCSID("$NetBSD: fsck.c,v 1.49 2010/02/24 13:56:07 hannken Exp $");
     40 #endif /* not lint */
     41 
     42 #include <sys/param.h>
     43 #include <sys/mount.h>
     44 #include <sys/queue.h>
     45 #include <sys/wait.h>
     46 #define FSTYPENAMES
     47 #define FSCKNAMES
     48 #include <sys/disk.h>
     49 #include <sys/disklabel.h>
     50 #include <sys/ioctl.h>
     51 
     52 #include <err.h>
     53 #include <errno.h>
     54 #include <fstab.h>
     55 #include <fcntl.h>
     56 #include <paths.h>
     57 #include <signal.h>
     58 #include <stdio.h>
     59 #include <stdlib.h>
     60 #include <string.h>
     61 #include <unistd.h>
     62 #include <util.h>
     63 
     64 #include "pathnames.h"
     65 #include "fsutil.h"
     66 #include "exitvalues.h"
     67 
     68 static enum { IN_LIST, NOT_IN_LIST } which = NOT_IN_LIST;
     69 
     70 TAILQ_HEAD(fstypelist, entry) opthead, selhead, omhead;
     71 
     72 struct entry {
     73 	char *type;
     74 	char *options;
     75 	TAILQ_ENTRY(entry) entries;
     76 };
     77 
     78 static int maxrun = 0;
     79 static char *options = NULL;
     80 static int flags = 0;
     81 
     82 static int checkfs(const char *, const char *, const char *, void *, pid_t *);
     83 static int selected(const char *);
     84 static int omitted(const char *);
     85 static void addoption(char *);
     86 static const char *getoptions(const char *);
     87 static void addentry(struct fstypelist *, const char *, const char *);
     88 static void maketypelist(char *);
     89 static void catopt(char **, const char *);
     90 static void mangle(char *, int *, const char ** volatile *, int *);
     91 static const char *getfslab(const char *);
     92 static void usage(void);
     93 static void *isok(struct fstab *);
     94 
     95 int
     96 main(int argc, char *argv[])
     97 {
     98 	struct fstab *fs;
     99 	int i, rval;
    100 	const char *vfstype = NULL;
    101 	char globopt[3];
    102 	int ret = FSCK_EXIT_OK;
    103 
    104 	globopt[0] = '-';
    105 	globopt[2] = '\0';
    106 
    107 	TAILQ_INIT(&selhead);
    108 	TAILQ_INIT(&opthead);
    109 	TAILQ_INIT(&omhead);
    110 
    111 	while ((i = getopt(argc, argv, "dfl:nPpqT:t:vx:y")) != -1) {
    112 		switch (i) {
    113 		case 'd':
    114 			flags |= CHECK_DEBUG;
    115 			continue;
    116 
    117 		case 'f':
    118 			flags |= CHECK_FORCE;
    119 			break;
    120 
    121 		case 'n':
    122 			flags |= CHECK_NOFIX;
    123 			break;
    124 
    125 		case 'p':
    126 			flags |= CHECK_PREEN;
    127 			break;
    128 
    129 		case 'P':
    130 			flags |= CHECK_PROGRESS;
    131 			break;
    132 
    133 		case 'q':
    134 			break;
    135 
    136 		case 'l':
    137 			maxrun = atoi(optarg);
    138 			continue;
    139 
    140 		case 'T':
    141 			if (*optarg)
    142 				addoption(optarg);
    143 			continue;
    144 
    145 		case 't':
    146 			if (TAILQ_FIRST(&selhead) != NULL)
    147 				errx(1, "only one -t option may be specified.");
    148 
    149 			maketypelist(optarg);
    150 			vfstype = optarg;
    151 			continue;
    152 
    153 		case 'v':
    154 			flags |= CHECK_VERBOSE;
    155 			continue;
    156 
    157 		case 'x':
    158 			addentry(&omhead, optarg, "");
    159 			continue;
    160 
    161 		case 'y':
    162 			break;
    163 
    164 		case '?':
    165 		default:
    166 			usage();
    167 			/* NOTREACHED */
    168 		}
    169 
    170 		/* Pass option to fsck_xxxfs */
    171 		globopt[1] = i;
    172 		catopt(&options, globopt);
    173 	}
    174 
    175 	/* Don't do progress meters if we're debugging. */
    176 	if (flags & CHECK_DEBUG)
    177 		flags &= ~CHECK_PROGRESS;
    178 
    179 	/*
    180 	 * If progress meters are being used, force max parallel to 1
    181 	 * so the progress meter outputs don't interfere with one another.
    182 	 */
    183 	if (flags & CHECK_PROGRESS)
    184 		maxrun = 1;
    185 
    186 	argc -= optind;
    187 	argv += optind;
    188 
    189 	if (argc == 0)
    190 		return checkfstab(flags, maxrun, isok, checkfs);
    191 
    192 #define	BADTYPE(type)							\
    193 	(strcmp(type, FSTAB_RO) &&					\
    194 	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
    195 
    196 
    197 	for (; argc--; argv++) {
    198 		const char *spec, *type, *cp;
    199 		char	device[MAXPATHLEN];
    200 
    201 		spec = *argv;
    202 		cp = strrchr(spec, '/');
    203 		if (cp == 0) {
    204 			(void)snprintf(device, sizeof(device), "%s%s",
    205 				_PATH_DEV, spec);
    206 			spec = device;
    207 		}
    208 		if ((fs = getfsfile(spec)) == NULL &&
    209 		    (fs = getfsspec(spec)) == NULL) {
    210 			if (vfstype == NULL)
    211 				vfstype = getfslab(spec);
    212 			type = vfstype;
    213 		}
    214 		else {
    215 			spec = fs->fs_spec;
    216 			type = fs->fs_vfstype;
    217 			if (BADTYPE(fs->fs_type))
    218 				errx(FSCK_EXIT_CHECK_FAILED,
    219 				    "%s has unknown file system type.",
    220 				    spec);
    221 		}
    222 
    223 		rval = checkfs(type, blockcheck(spec), *argv, NULL, NULL);
    224 		if (rval > ret)
    225 			ret = rval;
    226 	}
    227 
    228 	return ret;
    229 }
    230 
    231 
    232 static void *
    233 isok(struct fstab *fs)
    234 {
    235 
    236 	if (fs->fs_passno == 0)
    237 		return NULL;
    238 
    239 	if (BADTYPE(fs->fs_type))
    240 		return NULL;
    241 
    242 	if (!selected(fs->fs_vfstype))
    243 		return NULL;
    244 
    245 	if (omitted(fs->fs_file))
    246 		return NULL;
    247 
    248 	return fs;
    249 }
    250 
    251 
    252 static int
    253 checkfs(const char *vfst, const char *spec, const char *mntpt, void *auxarg,
    254     pid_t *pidp)
    255 {
    256 	/* List of directories containing fsck_xxx subcommands. */
    257 	static const char *edirs[] = {
    258 #ifdef RESCUEDIR
    259 		RESCUEDIR,
    260 #endif
    261 		_PATH_SBIN,
    262 		_PATH_USRSBIN,
    263 		NULL
    264 	};
    265 	const char ** volatile argv, **edir;
    266 	const char * volatile vfstype = vfst;
    267 	pid_t pid;
    268 	int argc, i, status, maxargc;
    269 	char *optb;
    270 	char *volatile optbuf;
    271 	char execname[MAXPATHLEN + 1], execbase[MAXPATHLEN];
    272 	const char *extra = getoptions(vfstype);
    273 
    274 	if (!strcmp(vfstype, "ufs"))
    275 		vfstype = MOUNT_UFS;
    276 
    277 	optb = NULL;
    278 	if (options)
    279 		catopt(&optb, options);
    280 	if (extra)
    281 		catopt(&optb, extra);
    282 	optbuf = optb;
    283 
    284 	maxargc = 64;
    285 	argv = emalloc(sizeof(char *) * maxargc);
    286 
    287 	(void) snprintf(execbase, sizeof(execbase), "fsck_%s", vfstype);
    288 	argc = 0;
    289 	argv[argc++] = execbase;
    290 	if (optbuf)
    291 		mangle(optbuf, &argc, &argv, &maxargc);
    292 	argv[argc++] = spec;
    293 	argv[argc] = NULL;
    294 
    295 	if (flags & (CHECK_DEBUG|CHECK_VERBOSE)) {
    296 		(void)printf("start %s %swait", mntpt,
    297 			pidp ? "no" : "");
    298 		for (i = 0; i < argc; i++)
    299 			(void)printf(" %s", argv[i]);
    300 		(void)printf("\n");
    301 	}
    302 
    303 	switch (pid = vfork()) {
    304 	case -1:				/* Error. */
    305 		warn("vfork");
    306 		if (optbuf)
    307 			free(optbuf);
    308 		free(argv);
    309 		return FSCK_EXIT_CHECK_FAILED;
    310 
    311 	case 0:					/* Child. */
    312 		if ((flags & CHECK_FORCE) == 0) {
    313 			struct statvfs	sfs;
    314 
    315 				/*
    316 				 * if mntpt is a mountpoint of a mounted file
    317 				 * system and it's mounted read-write, skip it
    318 				 * unless -f is given.
    319 				 */
    320 			if ((statvfs(mntpt, &sfs) == 0) &&
    321 			    (strcmp(mntpt, sfs.f_mntonname) == 0) &&
    322 			    ((sfs.f_flag & MNT_RDONLY) == 0)) {
    323 				printf(
    324 		"%s: file system is mounted read-write on %s; not checking\n",
    325 				    spec, mntpt);
    326 				if ((flags & CHECK_PREEN) && auxarg != NULL)
    327 					_exit(FSCK_EXIT_OK);	/* fsck -p */
    328 				else
    329 					_exit(FSCK_EXIT_CHECK_FAILED);	/* fsck [[-p] ...] */
    330 			}
    331 		}
    332 
    333 		if (flags & CHECK_DEBUG)
    334 			_exit(FSCK_EXIT_OK);
    335 
    336 		/* Go find an executable. */
    337 		edir = edirs;
    338 		do {
    339 			(void)snprintf(execname,
    340 			    sizeof(execname), "%s/%s", *edir, execbase);
    341 			execv(execname, (char * const *)__UNCONST(argv));
    342 			if (errno != ENOENT) {
    343 				if (spec)
    344 					warn("exec %s for %s", execname, spec);
    345 				else
    346 					warn("exec %s", execname);
    347 			}
    348 		} while (*++edir != NULL);
    349 
    350 		if (errno == ENOENT) {
    351 			if (spec)
    352 				warn("exec %s for %s", execname, spec);
    353 			else
    354 				warn("exec %s", execname);
    355 		}
    356 		_exit(FSCK_EXIT_CHECK_FAILED);
    357 		/* NOTREACHED */
    358 
    359 	default:				/* Parent. */
    360 		if (optbuf)
    361 			free(optbuf);
    362 		free(argv);
    363 
    364 		if (pidp) {
    365 			*pidp = pid;
    366 			return FSCK_EXIT_OK;
    367 		}
    368 
    369 		if (waitpid(pid, &status, 0) < 0) {
    370 			warn("waitpid");
    371 			return FSCK_EXIT_CHECK_FAILED;
    372 		}
    373 
    374 		if (WIFEXITED(status)) {
    375 			if (WEXITSTATUS(status) != 0)
    376 				return WEXITSTATUS(status);
    377 		}
    378 		else if (WIFSIGNALED(status)) {
    379 			warnx("%s: %s", spec, strsignal(WTERMSIG(status)));
    380 			return FSCK_EXIT_CHECK_FAILED;
    381 		}
    382 		break;
    383 	}
    384 
    385 	return FSCK_EXIT_OK;
    386 }
    387 
    388 
    389 static int
    390 selected(const char *type)
    391 {
    392 	struct entry *e;
    393 
    394 	/* If no type specified, it's always selected. */
    395 	TAILQ_FOREACH(e, &selhead, entries)
    396 		if (!strcmp(e->type, type))
    397 			return which == IN_LIST ? 1 : 0;
    398 
    399 	return which == IN_LIST ? 0 : 1;
    400 }
    401 
    402 
    403 static int
    404 omitted(const char *mountedon)
    405 {
    406 	struct entry *e;
    407 
    408 	/* If no type specified, it's always selected. */
    409 	TAILQ_FOREACH(e, &omhead, entries)
    410 		if (!strcmp(e->type, mountedon))
    411 			return 1;
    412 
    413 	return 0;
    414 }
    415 
    416 
    417 static const char *
    418 getoptions(const char *type)
    419 {
    420 	struct entry *e;
    421 
    422 	TAILQ_FOREACH(e, &opthead, entries)
    423 		if (!strcmp(e->type, type))
    424 			return e->options;
    425 	return "";
    426 }
    427 
    428 
    429 static void
    430 addoption(char *optstr)
    431 {
    432 	char *newoptions;
    433 	struct entry *e;
    434 
    435 	if ((newoptions = strchr(optstr, ':')) == NULL)
    436 		errx(1, "Invalid option string");
    437 
    438 	*newoptions++ = '\0';
    439 
    440 	TAILQ_FOREACH(e, &opthead, entries)
    441 		if (!strcmp(e->type, optstr)) {
    442 			catopt(&e->options, newoptions);
    443 			return;
    444 		}
    445 	addentry(&opthead, optstr, newoptions);
    446 }
    447 
    448 
    449 static void
    450 addentry(struct fstypelist *list, const char *type, const char *opts)
    451 {
    452 	struct entry *e;
    453 
    454 	e = emalloc(sizeof(struct entry));
    455 	e->type = estrdup(type);
    456 	e->options = estrdup(opts);
    457 	TAILQ_INSERT_TAIL(list, e, entries);
    458 }
    459 
    460 
    461 static void
    462 maketypelist(char *fslist)
    463 {
    464 	char *ptr;
    465 
    466 	if ((fslist == NULL) || (fslist[0] == '\0'))
    467 		errx(1, "empty type list");
    468 
    469 	if (fslist[0] == 'n' && fslist[1] == 'o') {
    470 		fslist += 2;
    471 		which = NOT_IN_LIST;
    472 	}
    473 	else
    474 		which = IN_LIST;
    475 
    476 	while ((ptr = strsep(&fslist, ",")) != NULL)
    477 		addentry(&selhead, ptr, "");
    478 
    479 }
    480 
    481 
    482 static void
    483 catopt(char **sp, const char *o)
    484 {
    485 	char *s;
    486 	size_t i, j;
    487 
    488 	s = *sp;
    489 	if (s) {
    490 		i = strlen(s);
    491 		j = i + 1 + strlen(o) + 1;
    492 		s = erealloc(s, j);
    493 		(void)snprintf(s + i, j, ",%s", o);
    494 	} else
    495 		s = estrdup(o);
    496 	*sp = s;
    497 }
    498 
    499 
    500 static void
    501 mangle(char *opts, int *argcp, const char ** volatile *argvp, int *maxargcp)
    502 {
    503 	char *p, *s;
    504 	int argc, maxargc;
    505 	const char **argv;
    506 
    507 	argc = *argcp;
    508 	argv = *argvp;
    509 	maxargc = *maxargcp;
    510 
    511 	for (s = opts; (p = strsep(&s, ",")) != NULL;) {
    512 		/* Always leave space for one more argument and the NULL. */
    513 		if (argc >= maxargc - 3) {
    514 			maxargc <<= 1;
    515 			argv = erealloc(argv, maxargc * sizeof(char *));
    516 		}
    517 		if (*p != '\0')  {
    518 			if (*p == '-') {
    519 				argv[argc++] = p;
    520 				p = strchr(p, '=');
    521 				if (p) {
    522 					*p = '\0';
    523 					argv[argc++] = p+1;
    524 				}
    525 			} else {
    526 				argv[argc++] = "-o";
    527 				argv[argc++] = p;
    528 			}
    529 		}
    530 	}
    531 
    532 	*argcp = argc;
    533 	*argvp = argv;
    534 	*maxargcp = maxargc;
    535 }
    536 
    537 static const char *
    538 getfslab(const char *str)
    539 {
    540 	static struct dkwedge_info dkw;
    541 	struct disklabel dl;
    542 	int fd;
    543 	char p;
    544 	const char *vfstype;
    545 	u_char t;
    546 
    547 	/* deduce the file system type from the disk label */
    548 	if ((fd = open(str, O_RDONLY)) == -1)
    549 		err(1, "cannot open `%s'", str);
    550 
    551 	/* First check to see if it's a wedge. */
    552 	if (ioctl(fd, DIOCGWEDGEINFO, &dkw) == 0) {
    553 		/* Yup, this is easy. */
    554 		(void) close(fd);
    555 		return (dkw.dkw_ptype);
    556 	}
    557 
    558 	if (ioctl(fd, DIOCGDINFO, &dl) == -1)
    559 		err(1, "cannot get disklabel for `%s'", str);
    560 
    561 	(void) close(fd);
    562 
    563 	p = str[strlen(str) - 1];
    564 
    565 	if ((p - 'a') >= dl.d_npartitions)
    566 		errx(1, "partition `%s' is not defined on disk", str);
    567 
    568 	if ((t = dl.d_partitions[p - 'a'].p_fstype) >= FSMAXTYPES)
    569 		errx(1, "partition `%s' is not of a legal vfstype",
    570 		    str);
    571 
    572 	if ((vfstype = fscknames[t]) == NULL)
    573 		errx(1, "vfstype `%s' on partition `%s' is not supported",
    574 		    fstypenames[t], str);
    575 
    576 	return vfstype;
    577 }
    578 
    579 
    580 static void
    581 usage(void)
    582 {
    583 	static const char common[] =
    584 	    "[-dfnPpqvy] [-x excludemount] [-l maxparallel] [-T fstype:fsoptions]\n\t\t[-t fstype]";
    585 
    586 	(void)fprintf(stderr, "usage: %s %s [special|node]...\n",
    587 	    getprogname(), common);
    588 	exit(FSCK_EXIT_USAGE);
    589 }
    590