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fsck.c revision 1.44 
      1 /*	$NetBSD: fsck.c,v 1.44 2006/10/16 02:44:46 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 1.44 2006/10/16 02:44:46 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/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 
     67 static enum { IN_LIST, NOT_IN_LIST } which = NOT_IN_LIST;
     68 
     69 TAILQ_HEAD(fstypelist, entry) opthead, selhead;
     70 
     71 struct entry {
     72 	char *type;
     73 	char *options;
     74 	TAILQ_ENTRY(entry) entries;
     75 };
     76 
     77 static int maxrun = 0;
     78 static char *options = NULL;
     79 static int flags = 0;
     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 ** volatile *, 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:nPpqT: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 			flags |= CHECK_NOFIX;
    119 			break;
    120 
    121 		case 'p':
    122 			flags |= CHECK_PREEN;
    123 			break;
    124 
    125 		case 'P':
    126 			flags |= CHECK_PROGRESS;
    127 			break;
    128 
    129 		case 'q':
    130 			break;
    131 
    132 		case 'l':
    133 			maxrun = atoi(optarg);
    134 			continue;
    135 
    136 		case 'T':
    137 			if (*optarg)
    138 				addoption(optarg);
    139 			continue;
    140 
    141 		case 't':
    142 			if (TAILQ_FIRST(&selhead) != NULL)
    143 				errx(1, "only one -t option may be specified.");
    144 
    145 			maketypelist(optarg);
    146 			vfstype = optarg;
    147 			continue;
    148 
    149 		case 'v':
    150 			flags |= CHECK_VERBOSE;
    151 			continue;
    152 
    153 		case 'y':
    154 			break;
    155 
    156 		case '?':
    157 		default:
    158 			usage();
    159 			/* NOTREACHED */
    160 		}
    161 
    162 		/* Pass option to fsck_xxxfs */
    163 		globopt[1] = i;
    164 		catopt(&options, globopt);
    165 	}
    166 
    167 	/* Don't do progress meters if we're debugging. */
    168 	if (flags & CHECK_DEBUG)
    169 		flags &= ~CHECK_PROGRESS;
    170 
    171 	/*
    172 	 * If progress meters are being used, force max parallel to 1
    173 	 * so the progress meter outputs don't interfere with one another.
    174 	 */
    175 	if (flags & CHECK_PROGRESS)
    176 		maxrun = 1;
    177 
    178 	argc -= optind;
    179 	argv += optind;
    180 
    181 	if (argc == 0)
    182 		return checkfstab(flags, maxrun, isok, checkfs);
    183 
    184 #define	BADTYPE(type)							\
    185 	(strcmp(type, FSTAB_RO) &&					\
    186 	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
    187 
    188 
    189 	for (; argc--; argv++) {
    190 		const char *spec, *type, *cp;
    191 		char	device[MAXPATHLEN];
    192 
    193 		spec = *argv;
    194 		cp = strrchr(spec, '/');
    195 		if (cp == 0) {
    196 			(void)snprintf(device, sizeof(device), "%s%s",
    197 				_PATH_DEV, spec);
    198 			spec = device;
    199 		}
    200 		if ((fs = getfsfile(spec)) == NULL &&
    201 		    (fs = getfsspec(spec)) == NULL) {
    202 			if (vfstype == NULL)
    203 				vfstype = getfslab(spec);
    204 			type = vfstype;
    205 		}
    206 		else {
    207 			spec = fs->fs_spec;
    208 			type = fs->fs_vfstype;
    209 			if (BADTYPE(fs->fs_type))
    210 				errx(1, "%s has unknown file system type.",
    211 				    spec);
    212 		}
    213 
    214 		rval |= checkfs(type, blockcheck(spec), *argv, NULL, NULL);
    215 	}
    216 
    217 	return rval;
    218 }
    219 
    220 
    221 static void *
    222 isok(struct fstab *fs)
    223 {
    224 
    225 	if (fs->fs_passno == 0)
    226 		return NULL;
    227 
    228 	if (BADTYPE(fs->fs_type))
    229 		return NULL;
    230 
    231 	if (!selected(fs->fs_vfstype))
    232 		return NULL;
    233 
    234 	return fs;
    235 }
    236 
    237 
    238 static int
    239 checkfs(const char *vfstype, const char *spec, const char *mntpt, void *auxarg,
    240     pid_t *pidp)
    241 {
    242 	/* List of directories containing fsck_xxx subcommands. */
    243 	static const char *edirs[] = {
    244 #ifdef RESCUEDIR
    245 		RESCUEDIR,
    246 #endif
    247 		_PATH_SBIN,
    248 		_PATH_USRSBIN,
    249 		NULL
    250 	};
    251 	const char ** volatile argv, **edir;
    252 	pid_t pid;
    253 	int argc, i, status, maxargc;
    254 	char *optbuf, execname[MAXPATHLEN + 1], execbase[MAXPATHLEN];
    255 	const char *extra = getoptions(vfstype);
    256 
    257 #ifdef __GNUC__
    258 	/* Avoid vfork clobbering */
    259 	(void) &optbuf;
    260 	(void) &vfstype;
    261 #endif
    262 
    263 	if (!strcmp(vfstype, "ufs"))
    264 		vfstype = MOUNT_UFS;
    265 
    266 	optbuf = NULL;
    267 	if (options)
    268 		catopt(&optbuf, options);
    269 	if (extra)
    270 		catopt(&optbuf, extra);
    271 
    272 	maxargc = 64;
    273 	argv = emalloc(sizeof(char *) * maxargc);
    274 
    275 	(void) snprintf(execbase, sizeof(execbase), "fsck_%s", vfstype);
    276 	argc = 0;
    277 	argv[argc++] = execbase;
    278 	if (optbuf)
    279 		mangle(optbuf, &argc, &argv, &maxargc);
    280 	argv[argc++] = spec;
    281 	argv[argc] = NULL;
    282 
    283 	if (flags & (CHECK_DEBUG|CHECK_VERBOSE)) {
    284 		(void)printf("start %s %swait", mntpt,
    285 			pidp ? "no" : "");
    286 		for (i = 0; i < argc; i++)
    287 			(void)printf(" %s", argv[i]);
    288 		(void)printf("\n");
    289 	}
    290 
    291 	switch (pid = vfork()) {
    292 	case -1:				/* Error. */
    293 		warn("vfork");
    294 		if (optbuf)
    295 			free(optbuf);
    296 		free(argv);
    297 		return (1);
    298 
    299 	case 0:					/* Child. */
    300 		if ((flags & CHECK_FORCE) == 0) {
    301 			struct statvfs	sfs;
    302 
    303 				/*
    304 				 * if mntpt is a mountpoint of a mounted file
    305 				 * system and it's mounted read-write, skip it
    306 				 * unless -f is given.
    307 				 */
    308 			if ((statvfs(mntpt, &sfs) == 0) &&
    309 			    (strcmp(mntpt, sfs.f_mntonname) == 0) &&
    310 			    ((sfs.f_flag & MNT_RDONLY) == 0)) {
    311 				printf(
    312 		"%s: file system is mounted read-write on %s; not checking\n",
    313 				    spec, mntpt);
    314 				if ((flags & CHECK_PREEN) && auxarg != NULL)
    315 					_exit(0);	/* fsck -p */
    316 				else
    317 					_exit(1);	/* fsck [[-p] ...] */
    318 			}
    319 		}
    320 
    321 		if (flags & CHECK_DEBUG)
    322 			_exit(0);
    323 
    324 		/* Go find an executable. */
    325 		edir = edirs;
    326 		do {
    327 			(void)snprintf(execname,
    328 			    sizeof(execname), "%s/%s", *edir, execbase);
    329 			execv(execname, (char * const *)__UNCONST(argv));
    330 			if (errno != ENOENT) {
    331 				if (spec)
    332 					warn("exec %s for %s", execname, spec);
    333 				else
    334 					warn("exec %s", execname);
    335 			}
    336 		} while (*++edir != NULL);
    337 
    338 		if (errno == ENOENT) {
    339 			if (spec)
    340 				warn("exec %s for %s", execname, spec);
    341 			else
    342 				warn("exec %s", execname);
    343 		}
    344 		_exit(1);
    345 		/* NOTREACHED */
    346 
    347 	default:				/* Parent. */
    348 		if (optbuf)
    349 			free(optbuf);
    350 		free(argv);
    351 
    352 		if (pidp) {
    353 			*pidp = pid;
    354 			return 0;
    355 		}
    356 
    357 		if (waitpid(pid, &status, 0) < 0) {
    358 			warn("waitpid");
    359 			return (1);
    360 		}
    361 
    362 		if (WIFEXITED(status)) {
    363 			if (WEXITSTATUS(status) != 0)
    364 				return (WEXITSTATUS(status));
    365 		}
    366 		else if (WIFSIGNALED(status)) {
    367 			warnx("%s: %s", spec, strsignal(WTERMSIG(status)));
    368 			return (1);
    369 		}
    370 		break;
    371 	}
    372 
    373 	return (0);
    374 }
    375 
    376 
    377 static int
    378 selected(const char *type)
    379 {
    380 	struct entry *e;
    381 
    382 	/* If no type specified, it's always selected. */
    383 	TAILQ_FOREACH(e, &selhead, entries)
    384 		if (!strncmp(e->type, type, MFSNAMELEN))
    385 			return which == IN_LIST ? 1 : 0;
    386 
    387 	return which == IN_LIST ? 0 : 1;
    388 }
    389 
    390 
    391 static const char *
    392 getoptions(const char *type)
    393 {
    394 	struct entry *e;
    395 
    396 	TAILQ_FOREACH(e, &opthead, entries)
    397 		if (!strncmp(e->type, type, MFSNAMELEN))
    398 			return e->options;
    399 	return "";
    400 }
    401 
    402 
    403 static void
    404 addoption(char *optstr)
    405 {
    406 	char *newoptions;
    407 	struct entry *e;
    408 
    409 	if ((newoptions = strchr(optstr, ':')) == NULL)
    410 		errx(1, "Invalid option string");
    411 
    412 	*newoptions++ = '\0';
    413 
    414 	TAILQ_FOREACH(e, &opthead, entries)
    415 		if (!strncmp(e->type, optstr, MFSNAMELEN)) {
    416 			catopt(&e->options, newoptions);
    417 			return;
    418 		}
    419 	addentry(&opthead, optstr, newoptions);
    420 }
    421 
    422 
    423 static void
    424 addentry(struct fstypelist *list, const char *type, const char *opts)
    425 {
    426 	struct entry *e;
    427 
    428 	e = emalloc(sizeof(struct entry));
    429 	e->type = estrdup(type);
    430 	e->options = estrdup(opts);
    431 	TAILQ_INSERT_TAIL(list, e, entries);
    432 }
    433 
    434 
    435 static void
    436 maketypelist(char *fslist)
    437 {
    438 	char *ptr;
    439 
    440 	if ((fslist == NULL) || (fslist[0] == '\0'))
    441 		errx(1, "empty type list");
    442 
    443 	if (fslist[0] == 'n' && fslist[1] == 'o') {
    444 		fslist += 2;
    445 		which = NOT_IN_LIST;
    446 	}
    447 	else
    448 		which = IN_LIST;
    449 
    450 	while ((ptr = strsep(&fslist, ",")) != NULL)
    451 		addentry(&selhead, ptr, "");
    452 
    453 }
    454 
    455 
    456 static void
    457 catopt(char **sp, const char *o)
    458 {
    459 	char *s;
    460 	size_t i, j;
    461 
    462 	s = *sp;
    463 	if (s) {
    464 		i = strlen(s);
    465 		j = i + 1 + strlen(o) + 1;
    466 		s = erealloc(s, j);
    467 		(void)snprintf(s + i, j, ",%s", o);
    468 	} else
    469 		s = estrdup(o);
    470 	*sp = s;
    471 }
    472 
    473 
    474 static void
    475 mangle(char *opts, int *argcp, const char ** volatile *argvp, int *maxargcp)
    476 {
    477 	char *p, *s;
    478 	int argc, maxargc;
    479 	const char **argv;
    480 
    481 	argc = *argcp;
    482 	argv = *argvp;
    483 	maxargc = *maxargcp;
    484 
    485 	for (s = opts; (p = strsep(&s, ",")) != NULL;) {
    486 		/* Always leave space for one more argument and the NULL. */
    487 		if (argc >= maxargc - 3) {
    488 			maxargc <<= 1;
    489 			argv = erealloc(argv, maxargc * sizeof(char *));
    490 		}
    491 		if (*p != '\0')  {
    492 			if (*p == '-') {
    493 				argv[argc++] = p;
    494 				p = strchr(p, '=');
    495 				if (p) {
    496 					*p = '\0';
    497 					argv[argc++] = p+1;
    498 				}
    499 			} else {
    500 				argv[argc++] = "-o";
    501 				argv[argc++] = p;
    502 			}
    503 		}
    504 	}
    505 
    506 	*argcp = argc;
    507 	*argvp = argv;
    508 	*maxargcp = maxargc;
    509 }
    510 
    511 static const char *
    512 getfslab(const char *str)
    513 {
    514 	static struct dkwedge_info dkw;
    515 	struct disklabel dl;
    516 	int fd;
    517 	char p;
    518 	const char *vfstype;
    519 	u_char t;
    520 
    521 	/* deduce the file system type from the disk label */
    522 	if ((fd = open(str, O_RDONLY)) == -1)
    523 		err(1, "cannot open `%s'", str);
    524 
    525 	/* First check to see if it's a wedge. */
    526 	if (ioctl(fd, DIOCGWEDGEINFO, &dkw) == 0) {
    527 		/* Yup, this is easy. */
    528 		(void) close(fd);
    529 		return (dkw.dkw_ptype);
    530 	}
    531 
    532 	if (ioctl(fd, DIOCGDINFO, &dl) == -1)
    533 		err(1, "cannot get disklabel for `%s'", str);
    534 
    535 	(void) close(fd);
    536 
    537 	p = str[strlen(str) - 1];
    538 
    539 	if ((p - 'a') >= dl.d_npartitions)
    540 		errx(1, "partition `%s' is not defined on disk", str);
    541 
    542 	if ((t = dl.d_partitions[p - 'a'].p_fstype) >= FSMAXTYPES)
    543 		errx(1, "partition `%s' is not of a legal vfstype",
    544 		    str);
    545 
    546 	if ((vfstype = fscknames[t]) == NULL)
    547 		errx(1, "vfstype `%s' on partition `%s' is not supported",
    548 		    fstypenames[t], str);
    549 
    550 	return vfstype;
    551 }
    552 
    553 
    554 static void
    555 usage(void)
    556 {
    557 	static const char common[] =
    558 	    "[-dfnPpqvy] [-l maxparallel] [-T fstype:fsoptions]\n\t\t[-t fstype]";
    559 
    560 	(void)fprintf(stderr, "usage: %s %s [special|node]...\n",
    561 	    getprogname(), common);
    562 	exit(1);
    563 }
    564