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fsck.c revision 1.33 
      1 /*	$NetBSD: fsck.c,v 1.33 2004/03/20 20:28:44 christos 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 1.33 2004/03/20 20:28:44 christos 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/disklabel.h>
     49 #include <sys/ioctl.h>
     50 
     51 #include <err.h>
     52 #include <errno.h>
     53 #include <fstab.h>
     54 #include <fcntl.h>
     55 #include <paths.h>
     56 #include <signal.h>
     57 #include <stdio.h>
     58 #include <stdlib.h>
     59 #include <string.h>
     60 #include <unistd.h>
     61 
     62 #include "pathnames.h"
     63 #include "fsutil.h"
     64 
     65 static enum { IN_LIST, NOT_IN_LIST } which = NOT_IN_LIST;
     66 
     67 TAILQ_HEAD(fstypelist, entry) opthead, selhead;
     68 
     69 struct entry {
     70 	char *type;
     71 	char *options;
     72 	TAILQ_ENTRY(entry) entries;
     73 };
     74 
     75 static int maxrun = 0;
     76 static char *options = NULL;
     77 static int flags = 0;
     78 
     79 int main(int, char *[]);
     80 
     81 static int checkfs(const char *, const char *, const char *, void *, pid_t *);
     82 static int selected(const char *);
     83 static void addoption(char *);
     84 static const char *getoptions(const char *);
     85 static void addentry(struct fstypelist *, const char *, const char *);
     86 static void maketypelist(char *);
     87 static void catopt(char **, const char *);
     88 static void mangle(char *, int *, const char ***, int *);
     89 static const char *getfslab(const char *);
     90 static void usage(void);
     91 static void *isok(struct fstab *);
     92 
     93 int
     94 main(int argc, char *argv[])
     95 {
     96 	struct fstab *fs;
     97 	int i, rval = 0;
     98 	const char *vfstype = NULL;
     99 	char globopt[3];
    100 
    101 	globopt[0] = '-';
    102 	globopt[2] = '\0';
    103 
    104 	TAILQ_INIT(&selhead);
    105 	TAILQ_INIT(&opthead);
    106 
    107 	while ((i = getopt(argc, argv, "dfl:npqT:t:vy")) != -1) {
    108 		switch (i) {
    109 		case 'd':
    110 			flags |= CHECK_DEBUG;
    111 			continue;
    112 
    113 		case 'f':
    114 			flags |= CHECK_FORCE;
    115 			break;
    116 
    117 		case 'n':
    118 			break;
    119 
    120 		case 'p':
    121 			flags |= CHECK_PREEN;
    122 			break;
    123 
    124 		case 'q':
    125 			break;
    126 
    127 		case 'l':
    128 			maxrun = atoi(optarg);
    129 			continue;
    130 
    131 		case 'T':
    132 			if (*optarg)
    133 				addoption(optarg);
    134 			continue;
    135 
    136 		case 't':
    137 			if (TAILQ_FIRST(&selhead) != NULL)
    138 				errx(1, "only one -t option may be specified.");
    139 
    140 			maketypelist(optarg);
    141 			vfstype = optarg;
    142 			continue;
    143 
    144 		case 'v':
    145 			flags |= CHECK_VERBOSE;
    146 			continue;
    147 
    148 		case 'y':
    149 			break;
    150 
    151 		case '?':
    152 		default:
    153 			usage();
    154 			/* NOTREACHED */
    155 		}
    156 
    157 		/* Pass option to fsck_xxxfs */
    158 		globopt[1] = i;
    159 		catopt(&options, globopt);
    160 	}
    161 
    162 	argc -= optind;
    163 	argv += optind;
    164 
    165 	if (argc == 0)
    166 		return checkfstab(flags, maxrun, isok, checkfs);
    167 
    168 #define	BADTYPE(type)							\
    169 	(strcmp(type, FSTAB_RO) &&					\
    170 	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
    171 
    172 
    173 	for (; argc--; argv++) {
    174 		const char *spec, *type, *cp;
    175 		char	device[MAXPATHLEN];
    176 
    177 		spec = *argv;
    178 		cp = strrchr(spec, '/');
    179 		if (cp == 0) {
    180 			(void)snprintf(device, sizeof(device), "%s%s",
    181 				_PATH_DEV, spec);
    182 			spec = device;
    183 		}
    184 		if ((fs = getfsfile(spec)) == NULL &&
    185 		    (fs = getfsspec(spec)) == NULL) {
    186 			if (vfstype == NULL)
    187 				vfstype = getfslab(spec);
    188 			type = vfstype;
    189 		}
    190 		else {
    191 			spec = fs->fs_spec;
    192 			type = fs->fs_vfstype;
    193 			if (BADTYPE(fs->fs_type))
    194 				errx(1, "%s has unknown file system type.",
    195 				    spec);
    196 		}
    197 
    198 		rval |= checkfs(type, blockcheck(spec), *argv, NULL, NULL);
    199 	}
    200 
    201 	return rval;
    202 }
    203 
    204 
    205 static void *
    206 isok(struct fstab *fs)
    207 {
    208 
    209 	if (fs->fs_passno == 0)
    210 		return NULL;
    211 
    212 	if (BADTYPE(fs->fs_type))
    213 		return NULL;
    214 
    215 	if (!selected(fs->fs_vfstype))
    216 		return NULL;
    217 
    218 	return fs;
    219 }
    220 
    221 
    222 static int
    223 checkfs(const char *vfstype, const char *spec, const char *mntpt, void *auxarg,
    224     pid_t *pidp)
    225 {
    226 	/* List of directories containing fsck_xxx subcommands. */
    227 	static const char *edirs[] = {
    228 #ifdef _PATH_RESCUE
    229 		_PATH_RESCUE,
    230 #endif
    231 		_PATH_SBIN,
    232 		_PATH_USRSBIN,
    233 		NULL
    234 	};
    235 	const char **argv, **edir;
    236 	pid_t pid;
    237 	int argc, i, status, maxargc;
    238 	char *optbuf, execname[MAXPATHLEN + 1], execbase[MAXPATHLEN];
    239 	const char *extra = getoptions(vfstype);
    240 
    241 #ifdef __GNUC__
    242 	/* Avoid vfork clobbering */
    243 	(void) &optbuf;
    244 	(void) &vfstype;
    245 #endif
    246 
    247 	if (!strcmp(vfstype, "ufs"))
    248 		vfstype = MOUNT_UFS;
    249 
    250 	optbuf = NULL;
    251 	if (options)
    252 		catopt(&optbuf, options);
    253 	if (extra)
    254 		catopt(&optbuf, extra);
    255 
    256 	maxargc = 64;
    257 	argv = emalloc(sizeof(char *) * maxargc);
    258 
    259 	(void) snprintf(execbase, sizeof(execbase), "fsck_%s", vfstype);
    260 	argc = 0;
    261 	argv[argc++] = execbase;
    262 	if (optbuf)
    263 		mangle(optbuf, &argc, &argv, &maxargc);
    264 	argv[argc++] = spec;
    265 	argv[argc] = NULL;
    266 
    267 	if (flags & (CHECK_DEBUG|CHECK_VERBOSE)) {
    268 		(void)printf("start %s %swait", mntpt,
    269 			pidp ? "no" : "");
    270 		for (i = 0; i < argc; i++)
    271 			(void)printf(" %s", argv[i]);
    272 		(void)printf("\n");
    273 	}
    274 
    275 	switch (pid = vfork()) {
    276 	case -1:				/* Error. */
    277 		warn("vfork");
    278 		if (optbuf)
    279 			free(optbuf);
    280 		return (1);
    281 
    282 	case 0:					/* Child. */
    283 		if ((flags & CHECK_FORCE) == 0) {
    284 			struct statfs	sfs;
    285 
    286 				/*
    287 				 * if mntpt is a mountpoint of a mounted file
    288 				 * system and it's mounted read-write, skip it
    289 				 * unless -f is given.
    290 				 */
    291 			if ((statfs(mntpt, &sfs) == 0) &&
    292 			    (strcmp(mntpt, sfs.f_mntonname) == 0) &&
    293 			    ((sfs.f_flags & MNT_RDONLY) == 0)) {
    294 				printf(
    295 		"%s: file system is mounted read-write on %s; not checking\n",
    296 				    spec, mntpt);
    297 				if ((flags & CHECK_PREEN) && auxarg != NULL)
    298 					_exit(0);	/* fsck -p */
    299 				else
    300 					_exit(1);	/* fsck [[-p] ...] */
    301 			}
    302 		}
    303 
    304 		if (flags & CHECK_DEBUG)
    305 			_exit(0);
    306 
    307 		/* Go find an executable. */
    308 		edir = edirs;
    309 		do {
    310 			(void)snprintf(execname,
    311 			    sizeof(execname), "%s/%s", *edir, execbase);
    312 			execv(execname, (char * const *)argv);
    313 			if (errno != ENOENT) {
    314 				if (spec)
    315 					warn("exec %s for %s", execname, spec);
    316 				else
    317 					warn("exec %s", execname);
    318 			}
    319 		} while (*++edir != NULL);
    320 
    321 		if (errno == ENOENT) {
    322 			if (spec)
    323 				warn("exec %s for %s", execname, spec);
    324 			else
    325 				warn("exec %s", execname);
    326 		}
    327 		_exit(1);
    328 		/* NOTREACHED */
    329 
    330 	default:				/* Parent. */
    331 		if (optbuf)
    332 			free(optbuf);
    333 
    334 		if (pidp) {
    335 			*pidp = pid;
    336 			return 0;
    337 		}
    338 
    339 		if (waitpid(pid, &status, 0) < 0) {
    340 			warn("waitpid");
    341 			return (1);
    342 		}
    343 
    344 		if (WIFEXITED(status)) {
    345 			if (WEXITSTATUS(status) != 0)
    346 				return (WEXITSTATUS(status));
    347 		}
    348 		else if (WIFSIGNALED(status)) {
    349 			warnx("%s: %s", spec, strsignal(WTERMSIG(status)));
    350 			return (1);
    351 		}
    352 		break;
    353 	}
    354 
    355 	return (0);
    356 }
    357 
    358 
    359 static int
    360 selected(const char *type)
    361 {
    362 	struct entry *e;
    363 
    364 	/* If no type specified, it's always selected. */
    365 	TAILQ_FOREACH(e, &selhead, entries)
    366 		if (!strncmp(e->type, type, MFSNAMELEN))
    367 			return which == IN_LIST ? 1 : 0;
    368 
    369 	return which == IN_LIST ? 0 : 1;
    370 }
    371 
    372 
    373 static const char *
    374 getoptions(const char *type)
    375 {
    376 	struct entry *e;
    377 
    378 	TAILQ_FOREACH(e, &opthead, entries)
    379 		if (!strncmp(e->type, type, MFSNAMELEN))
    380 			return e->options;
    381 	return "";
    382 }
    383 
    384 
    385 static void
    386 addoption(char *optstr)
    387 {
    388 	char *newoptions;
    389 	struct entry *e;
    390 
    391 	if ((newoptions = strchr(optstr, ':')) == NULL)
    392 		errx(1, "Invalid option string");
    393 
    394 	*newoptions++ = '\0';
    395 
    396 	TAILQ_FOREACH(e, &opthead, entries)
    397 		if (!strncmp(e->type, optstr, MFSNAMELEN)) {
    398 			catopt(&e->options, newoptions);
    399 			return;
    400 		}
    401 	addentry(&opthead, optstr, newoptions);
    402 }
    403 
    404 
    405 static void
    406 addentry(struct fstypelist *list, const char *type, const char *opts)
    407 {
    408 	struct entry *e;
    409 
    410 	e = emalloc(sizeof(struct entry));
    411 	e->type = estrdup(type);
    412 	e->options = estrdup(opts);
    413 	TAILQ_INSERT_TAIL(list, e, entries);
    414 }
    415 
    416 
    417 static void
    418 maketypelist(char *fslist)
    419 {
    420 	char *ptr;
    421 
    422 	if ((fslist == NULL) || (fslist[0] == '\0'))
    423 		errx(1, "empty type list");
    424 
    425 	if (fslist[0] == 'n' && fslist[1] == 'o') {
    426 		fslist += 2;
    427 		which = NOT_IN_LIST;
    428 	}
    429 	else
    430 		which = IN_LIST;
    431 
    432 	while ((ptr = strsep(&fslist, ",")) != NULL)
    433 		addentry(&selhead, ptr, "");
    434 
    435 }
    436 
    437 
    438 static void
    439 catopt(char **sp, const char *o)
    440 {
    441 	char *s;
    442 	size_t i, j;
    443 
    444 	s = *sp;
    445 	if (s) {
    446 		i = strlen(s);
    447 		j = i + 1 + strlen(o) + 1;
    448 		s = erealloc(s, j);
    449 		(void)snprintf(s + i, j, ",%s", o);
    450 	} else
    451 		s = estrdup(o);
    452 	*sp = s;
    453 }
    454 
    455 
    456 static void
    457 mangle(char *opts, int *argcp, const char ***argvp, int *maxargcp)
    458 {
    459 	char *p, *s;
    460 	int argc, maxargc;
    461 	const char **argv;
    462 
    463 	argc = *argcp;
    464 	argv = *argvp;
    465 	maxargc = *maxargcp;
    466 
    467 	for (s = opts; (p = strsep(&s, ",")) != NULL;) {
    468 		/* Always leave space for one more argument and the NULL. */
    469 		if (argc >= maxargc - 3) {
    470 			maxargc <<= 1;
    471 			argv = erealloc(argv, maxargc * sizeof(char *));
    472 		}
    473 		if (*p != '\0')  {
    474 			if (*p == '-') {
    475 				argv[argc++] = p;
    476 				p = strchr(p, '=');
    477 				if (p) {
    478 					*p = '\0';
    479 					argv[argc++] = p+1;
    480 				}
    481 			} else {
    482 				argv[argc++] = "-o";
    483 				argv[argc++] = p;
    484 			}
    485 		}
    486 	}
    487 
    488 	*argcp = argc;
    489 	*argvp = argv;
    490 	*maxargcp = maxargc;
    491 }
    492 
    493 
    494 const static char *
    495 getfslab(const char *str)
    496 {
    497 	struct disklabel dl;
    498 	int fd;
    499 	char p;
    500 	const char *vfstype;
    501 	u_char t;
    502 
    503 	/* deduce the file system type from the disk label */
    504 	if ((fd = open(str, O_RDONLY)) == -1)
    505 		err(1, "cannot open `%s'", str);
    506 
    507 	if (ioctl(fd, DIOCGDINFO, &dl) == -1)
    508 		err(1, "cannot get disklabel for `%s'", str);
    509 
    510 	(void) close(fd);
    511 
    512 	p = str[strlen(str) - 1];
    513 
    514 	if ((p - 'a') >= dl.d_npartitions)
    515 		errx(1, "partition `%s' is not defined on disk", str);
    516 
    517 	if ((t = dl.d_partitions[p - 'a'].p_fstype) >= FSMAXTYPES)
    518 		errx(1, "partition `%s' is not of a legal vfstype",
    519 		    str);
    520 
    521 	if ((vfstype = fscknames[t]) == NULL)
    522 		errx(1, "vfstype `%s' on partition `%s' is not supported",
    523 		    fstypenames[t], str);
    524 
    525 	return vfstype;
    526 }
    527 
    528 
    529 static void
    530 usage(void)
    531 {
    532 	static const char common[] =
    533 	    "[-dfnpqvy] [-T fstype:fsoptions] [-t fstype]";
    534 
    535 	(void)fprintf(stderr, "usage: %s %s [special|node]...\n",
    536 	    getprogname(), common);
    537 	exit(1);
    538 }
    539