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fsck.c revision 1.29 
      1 /*	$NetBSD: fsck.c,v 1.29 2002/08/23 03:17:18 lukem 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. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  * From: @(#)mount.c	8.19 (Berkeley) 4/19/94
     37  * From: NetBSD: mount.c,v 1.24 1995/11/18 03:34:29 cgd Exp
     38  *
     39  */
     40 
     41 #include <sys/cdefs.h>
     42 #ifndef lint
     43 __RCSID("$NetBSD: fsck.c,v 1.29 2002/08/23 03:17:18 lukem Exp $");
     44 #endif /* not lint */
     45 
     46 #include <sys/param.h>
     47 #include <sys/mount.h>
     48 #include <sys/queue.h>
     49 #include <sys/wait.h>
     50 #define FSTYPENAMES
     51 #define FSCKNAMES
     52 #include <sys/disklabel.h>
     53 #include <sys/ioctl.h>
     54 
     55 #include <err.h>
     56 #include <errno.h>
     57 #include <fstab.h>
     58 #include <fcntl.h>
     59 #include <paths.h>
     60 #include <signal.h>
     61 #include <stdio.h>
     62 #include <stdlib.h>
     63 #include <string.h>
     64 #include <unistd.h>
     65 
     66 #include "pathnames.h"
     67 #include "fsutil.h"
     68 
     69 static enum { IN_LIST, NOT_IN_LIST } which = NOT_IN_LIST;
     70 
     71 TAILQ_HEAD(fstypelist, entry) opthead, selhead;
     72 
     73 struct entry {
     74 	char *type;
     75 	char *options;
     76 	TAILQ_ENTRY(entry) entries;
     77 };
     78 
     79 static int maxrun = 0;
     80 static char *options = NULL;
     81 static int flags = 0;
     82 
     83 int main(int, char *[]);
     84 
     85 static int checkfs(const char *, const char *, const char *, void *, pid_t *);
     86 static int selected(const char *);
     87 static void addoption(char *);
     88 static const char *getoptions(const char *);
     89 static void addentry(struct fstypelist *, const char *, const char *);
     90 static void maketypelist(char *);
     91 static void catopt(char **, const char *);
     92 static void mangle(char *, int *, const char ***, int *);
     93 static const char *getfslab(const char *);
     94 static void usage(void);
     95 static void *isok(struct fstab *);
     96 
     97 int
     98 main(int argc, char *argv[])
     99 {
    100 	struct fstab *fs;
    101 	int i, rval = 0;
    102 	const char *vfstype = NULL;
    103 	char globopt[3];
    104 
    105 	globopt[0] = '-';
    106 	globopt[2] = '\0';
    107 
    108 	TAILQ_INIT(&selhead);
    109 	TAILQ_INIT(&opthead);
    110 
    111 	while ((i = getopt(argc, argv, "dvpfnyl:t:T:")) != -1)
    112 		switch (i) {
    113 		case 'd':
    114 			flags |= CHECK_DEBUG;
    115 			break;
    116 
    117 		case 'v':
    118 			flags |= CHECK_VERBOSE;
    119 			break;
    120 
    121 		case 'p':
    122 		case 'f':
    123 			if (i == 'p')
    124 				flags |= CHECK_PREEN;
    125 			else
    126 				flags |= CHECK_FORCE;
    127 			/*FALLTHROUGH*/
    128 		case 'n':
    129 		case 'y':
    130 			globopt[1] = i;
    131 			catopt(&options, globopt);
    132 			break;
    133 
    134 		case 'l':
    135 			maxrun = atoi(optarg);
    136 			break;
    137 
    138 		case 'T':
    139 			if (*optarg)
    140 				addoption(optarg);
    141 			break;
    142 
    143 		case 't':
    144 			if (TAILQ_FIRST(&selhead) != NULL)
    145 				errx(1, "only one -t option may be specified.");
    146 
    147 			maketypelist(optarg);
    148 			vfstype = optarg;
    149 			break;
    150 
    151 		case '?':
    152 		default:
    153 			usage();
    154 			/* NOTREACHED */
    155 		}
    156 
    157 	argc -= optind;
    158 	argv += optind;
    159 
    160 	if (argc == 0)
    161 		return checkfstab(flags, maxrun, isok, checkfs);
    162 
    163 #define	BADTYPE(type)							\
    164 	(strcmp(type, FSTAB_RO) &&					\
    165 	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
    166 
    167 
    168 	for (; argc--; argv++) {
    169 		const char *spec, *type, *cp;
    170 		char	device[MAXPATHLEN];
    171 
    172 		spec = *argv;
    173 		cp = strrchr(spec, '/');
    174 		if (cp == 0) {
    175 			(void)snprintf(device, sizeof(device), "%s%s",
    176 				_PATH_DEV, spec);
    177 			spec = device;
    178 		}
    179 		if ((fs = getfsfile(spec)) == NULL &&
    180 		    (fs = getfsspec(spec)) == NULL) {
    181 			if (vfstype == NULL)
    182 				vfstype = getfslab(spec);
    183 			type = vfstype;
    184 		}
    185 		else {
    186 			spec = fs->fs_spec;
    187 			type = fs->fs_vfstype;
    188 			if (BADTYPE(fs->fs_type))
    189 				errx(1, "%s has unknown file system type.",
    190 				    spec);
    191 		}
    192 
    193 		rval |= checkfs(type, blockcheck(spec), *argv, NULL, NULL);
    194 	}
    195 
    196 	return rval;
    197 }
    198 
    199 
    200 static void *
    201 isok(struct fstab *fs)
    202 {
    203 
    204 	if (fs->fs_passno == 0)
    205 		return NULL;
    206 
    207 	if (BADTYPE(fs->fs_type))
    208 		return NULL;
    209 
    210 	if (!selected(fs->fs_vfstype))
    211 		return NULL;
    212 
    213 	return fs;
    214 }
    215 
    216 
    217 static int
    218 checkfs(const char *vfstype, const char *spec, const char *mntpt, void *auxarg,
    219     pid_t *pidp)
    220 {
    221 	/* List of directories containing fsck_xxx subcommands. */
    222 	static const char *edirs[] = {
    223 #ifdef _PATH_RESCUE
    224 		_PATH_RESCUE,
    225 #endif
    226 		_PATH_SBIN,
    227 		_PATH_USRSBIN,
    228 		NULL
    229 	};
    230 	const char **argv, **edir;
    231 	pid_t pid;
    232 	int argc, i, status, maxargc;
    233 	char *optbuf, execname[MAXPATHLEN + 1], execbase[MAXPATHLEN];
    234 	const char *extra = getoptions(vfstype);
    235 
    236 #ifdef __GNUC__
    237 	/* Avoid vfork clobbering */
    238 	(void) &optbuf;
    239 	(void) &vfstype;
    240 #endif
    241 
    242 	if (!strcmp(vfstype, "ufs"))
    243 		vfstype = MOUNT_UFS;
    244 
    245 	optbuf = NULL;
    246 	if (options)
    247 		catopt(&optbuf, options);
    248 	if (extra)
    249 		catopt(&optbuf, extra);
    250 
    251 	maxargc = 64;
    252 	argv = emalloc(sizeof(char *) * maxargc);
    253 
    254 	(void) snprintf(execbase, sizeof(execbase), "fsck_%s", vfstype);
    255 	argc = 0;
    256 	argv[argc++] = execbase;
    257 	if (optbuf)
    258 		mangle(optbuf, &argc, &argv, &maxargc);
    259 	argv[argc++] = spec;
    260 	argv[argc] = NULL;
    261 
    262 	if (flags & (CHECK_DEBUG|CHECK_VERBOSE)) {
    263 		(void)printf("start %s %swait", mntpt,
    264 			pidp ? "no" : "");
    265 		for (i = 0; i < argc; i++)
    266 			(void)printf(" %s", argv[i]);
    267 		(void)printf("\n");
    268 	}
    269 
    270 	switch (pid = vfork()) {
    271 	case -1:				/* Error. */
    272 		warn("vfork");
    273 		if (optbuf)
    274 			free(optbuf);
    275 		return (1);
    276 
    277 	case 0:					/* Child. */
    278 		if ((flags & CHECK_FORCE) == 0) {
    279 			struct statfs	sfs;
    280 
    281 				/*
    282 				 * if mntpt is a mountpoint of a mounted file
    283 				 * system and it's mounted read-write, skip it
    284 				 * unless -f is given.
    285 				 */
    286 			if ((statfs(mntpt, &sfs) == 0) &&
    287 			    (strcmp(mntpt, sfs.f_mntonname) == 0) &&
    288 			    ((sfs.f_flags & MNT_RDONLY) == 0)) {
    289 				printf(
    290 		"%s: file system is mounted read-write on %s; not checking\n",
    291 				    spec, mntpt);
    292 				if ((flags & CHECK_PREEN) && auxarg != NULL)
    293 					_exit(0);	/* fsck -p */
    294 				else
    295 					_exit(1);	/* fsck [[-p] ...] */
    296 			}
    297 		}
    298 
    299 		if (flags & CHECK_DEBUG)
    300 			_exit(0);
    301 
    302 		/* Go find an executable. */
    303 		edir = edirs;
    304 		do {
    305 			(void)snprintf(execname,
    306 			    sizeof(execname), "%s/%s", *edir, execbase);
    307 			execv(execname, (char * const *)argv);
    308 			if (errno != ENOENT) {
    309 				if (spec)
    310 					warn("exec %s for %s", execname, spec);
    311 				else
    312 					warn("exec %s", execname);
    313 			}
    314 		} while (*++edir != NULL);
    315 
    316 		if (errno == ENOENT) {
    317 			if (spec)
    318 				warn("exec %s for %s", execname, spec);
    319 			else
    320 				warn("exec %s", execname);
    321 		}
    322 		_exit(1);
    323 		/* NOTREACHED */
    324 
    325 	default:				/* Parent. */
    326 		if (optbuf)
    327 			free(optbuf);
    328 
    329 		if (pidp) {
    330 			*pidp = pid;
    331 			return 0;
    332 		}
    333 
    334 		if (waitpid(pid, &status, 0) < 0) {
    335 			warn("waitpid");
    336 			return (1);
    337 		}
    338 
    339 		if (WIFEXITED(status)) {
    340 			if (WEXITSTATUS(status) != 0)
    341 				return (WEXITSTATUS(status));
    342 		}
    343 		else if (WIFSIGNALED(status)) {
    344 			warnx("%s: %s", spec, strsignal(WTERMSIG(status)));
    345 			return (1);
    346 		}
    347 		break;
    348 	}
    349 
    350 	return (0);
    351 }
    352 
    353 
    354 static int
    355 selected(const char *type)
    356 {
    357 	struct entry *e;
    358 
    359 	/* If no type specified, it's always selected. */
    360 	TAILQ_FOREACH(e, &selhead, entries)
    361 		if (!strncmp(e->type, type, MFSNAMELEN))
    362 			return which == IN_LIST ? 1 : 0;
    363 
    364 	return which == IN_LIST ? 0 : 1;
    365 }
    366 
    367 
    368 static const char *
    369 getoptions(const char *type)
    370 {
    371 	struct entry *e;
    372 
    373 	TAILQ_FOREACH(e, &opthead, entries)
    374 		if (!strncmp(e->type, type, MFSNAMELEN))
    375 			return e->options;
    376 	return "";
    377 }
    378 
    379 
    380 static void
    381 addoption(char *optstr)
    382 {
    383 	char *newoptions;
    384 	struct entry *e;
    385 
    386 	if ((newoptions = strchr(optstr, ':')) == NULL)
    387 		errx(1, "Invalid option string");
    388 
    389 	*newoptions++ = '\0';
    390 
    391 	TAILQ_FOREACH(e, &opthead, entries)
    392 		if (!strncmp(e->type, optstr, MFSNAMELEN)) {
    393 			catopt(&e->options, newoptions);
    394 			return;
    395 		}
    396 	addentry(&opthead, optstr, newoptions);
    397 }
    398 
    399 
    400 static void
    401 addentry(struct fstypelist *list, const char *type, const char *opts)
    402 {
    403 	struct entry *e;
    404 
    405 	e = emalloc(sizeof(struct entry));
    406 	e->type = estrdup(type);
    407 	e->options = estrdup(opts);
    408 	TAILQ_INSERT_TAIL(list, e, entries);
    409 }
    410 
    411 
    412 static void
    413 maketypelist(char *fslist)
    414 {
    415 	char *ptr;
    416 
    417 	if ((fslist == NULL) || (fslist[0] == '\0'))
    418 		errx(1, "empty type list");
    419 
    420 	if (fslist[0] == 'n' && fslist[1] == 'o') {
    421 		fslist += 2;
    422 		which = NOT_IN_LIST;
    423 	}
    424 	else
    425 		which = IN_LIST;
    426 
    427 	while ((ptr = strsep(&fslist, ",")) != NULL)
    428 		addentry(&selhead, ptr, "");
    429 
    430 }
    431 
    432 
    433 static void
    434 catopt(char **sp, const char *o)
    435 {
    436 	char *s;
    437 	size_t i, j;
    438 
    439 	s = *sp;
    440 	if (s) {
    441 		i = strlen(s);
    442 		j = i + 1 + strlen(o) + 1;
    443 		s = erealloc(s, j);
    444 		(void)snprintf(s + i, j, ",%s", o);
    445 	} else
    446 		s = estrdup(o);
    447 	*sp = s;
    448 }
    449 
    450 
    451 static void
    452 mangle(char *opts, int *argcp, const char ***argvp, int *maxargcp)
    453 {
    454 	char *p, *s;
    455 	int argc, maxargc;
    456 	const char **argv;
    457 
    458 	argc = *argcp;
    459 	argv = *argvp;
    460 	maxargc = *maxargcp;
    461 
    462 	for (s = opts; (p = strsep(&s, ",")) != NULL;) {
    463 		/* Always leave space for one more argument and the NULL. */
    464 		if (argc >= maxargc - 3) {
    465 			maxargc <<= 1;
    466 			argv = erealloc(argv, maxargc * sizeof(char *));
    467 		}
    468 		if (*p != '\0')  {
    469 			if (*p == '-') {
    470 				argv[argc++] = p;
    471 				p = strchr(p, '=');
    472 				if (p) {
    473 					*p = '\0';
    474 					argv[argc++] = p+1;
    475 				}
    476 			} else {
    477 				argv[argc++] = "-o";
    478 				argv[argc++] = p;
    479 			}
    480 		}
    481 	}
    482 
    483 	*argcp = argc;
    484 	*argvp = argv;
    485 	*maxargcp = maxargc;
    486 }
    487 
    488 
    489 const static char *
    490 getfslab(const char *str)
    491 {
    492 	struct disklabel dl;
    493 	int fd;
    494 	char p;
    495 	const char *vfstype;
    496 	u_char t;
    497 
    498 	/* deduce the file system type from the disk label */
    499 	if ((fd = open(str, O_RDONLY)) == -1)
    500 		err(1, "cannot open `%s'", str);
    501 
    502 	if (ioctl(fd, DIOCGDINFO, &dl) == -1)
    503 		err(1, "cannot get disklabel for `%s'", str);
    504 
    505 	(void) close(fd);
    506 
    507 	p = str[strlen(str) - 1];
    508 
    509 	if ((p - 'a') >= dl.d_npartitions)
    510 		errx(1, "partition `%s' is not defined on disk", str);
    511 
    512 	if ((t = dl.d_partitions[p - 'a'].p_fstype) >= FSMAXTYPES)
    513 		errx(1, "partition `%s' is not of a legal vfstype",
    514 		    str);
    515 
    516 	if ((vfstype = fscknames[t]) == NULL)
    517 		errx(1, "vfstype `%s' on partition `%s' is not supported",
    518 		    fstypenames[t], str);
    519 
    520 	return vfstype;
    521 }
    522 
    523 
    524 static void
    525 usage(void)
    526 {
    527 	static const char common[] =
    528 	    "[-dfnpvy] [-T fstype:fsoptions] [-t fstype]";
    529 
    530 	(void)fprintf(stderr, "Usage: %s %s [special|node]...\n",
    531 	    getprogname(), common);
    532 	exit(1);
    533 }
    534