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fsck.c revision 1.45 
      1 /*	$NetBSD: fsck.c,v 1.45 2006/12/13 16:08:26 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 1.45 2006/12/13 16:08:26 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 *vfst, 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 	const char * volatile vfstype = vfst;
    253 	pid_t pid;
    254 	int argc, i, status, maxargc;
    255 	char *optb;
    256 	char *volatile optbuf;
    257 	char execname[MAXPATHLEN + 1], execbase[MAXPATHLEN];
    258 	const char *extra = getoptions(vfstype);
    259 
    260 	if (!strcmp(vfstype, "ufs"))
    261 		vfstype = MOUNT_UFS;
    262 
    263 	optb = NULL;
    264 	if (options)
    265 		catopt(&optb, options);
    266 	if (extra)
    267 		catopt(&optb, extra);
    268 	optbuf = optb;
    269 
    270 	maxargc = 64;
    271 	argv = emalloc(sizeof(char *) * maxargc);
    272 
    273 	(void) snprintf(execbase, sizeof(execbase), "fsck_%s", vfstype);
    274 	argc = 0;
    275 	argv[argc++] = execbase;
    276 	if (optbuf)
    277 		mangle(optbuf, &argc, &argv, &maxargc);
    278 	argv[argc++] = spec;
    279 	argv[argc] = NULL;
    280 
    281 	if (flags & (CHECK_DEBUG|CHECK_VERBOSE)) {
    282 		(void)printf("start %s %swait", mntpt,
    283 			pidp ? "no" : "");
    284 		for (i = 0; i < argc; i++)
    285 			(void)printf(" %s", argv[i]);
    286 		(void)printf("\n");
    287 	}
    288 
    289 	switch (pid = vfork()) {
    290 	case -1:				/* Error. */
    291 		warn("vfork");
    292 		if (optbuf)
    293 			free(optbuf);
    294 		free(argv);
    295 		return (1);
    296 
    297 	case 0:					/* Child. */
    298 		if ((flags & CHECK_FORCE) == 0) {
    299 			struct statvfs	sfs;
    300 
    301 				/*
    302 				 * if mntpt is a mountpoint of a mounted file
    303 				 * system and it's mounted read-write, skip it
    304 				 * unless -f is given.
    305 				 */
    306 			if ((statvfs(mntpt, &sfs) == 0) &&
    307 			    (strcmp(mntpt, sfs.f_mntonname) == 0) &&
    308 			    ((sfs.f_flag & MNT_RDONLY) == 0)) {
    309 				printf(
    310 		"%s: file system is mounted read-write on %s; not checking\n",
    311 				    spec, mntpt);
    312 				if ((flags & CHECK_PREEN) && auxarg != NULL)
    313 					_exit(0);	/* fsck -p */
    314 				else
    315 					_exit(1);	/* fsck [[-p] ...] */
    316 			}
    317 		}
    318 
    319 		if (flags & CHECK_DEBUG)
    320 			_exit(0);
    321 
    322 		/* Go find an executable. */
    323 		edir = edirs;
    324 		do {
    325 			(void)snprintf(execname,
    326 			    sizeof(execname), "%s/%s", *edir, execbase);
    327 			execv(execname, (char * const *)__UNCONST(argv));
    328 			if (errno != ENOENT) {
    329 				if (spec)
    330 					warn("exec %s for %s", execname, spec);
    331 				else
    332 					warn("exec %s", execname);
    333 			}
    334 		} while (*++edir != NULL);
    335 
    336 		if (errno == ENOENT) {
    337 			if (spec)
    338 				warn("exec %s for %s", execname, spec);
    339 			else
    340 				warn("exec %s", execname);
    341 		}
    342 		_exit(1);
    343 		/* NOTREACHED */
    344 
    345 	default:				/* Parent. */
    346 		if (optbuf)
    347 			free(optbuf);
    348 		free(argv);
    349 
    350 		if (pidp) {
    351 			*pidp = pid;
    352 			return 0;
    353 		}
    354 
    355 		if (waitpid(pid, &status, 0) < 0) {
    356 			warn("waitpid");
    357 			return (1);
    358 		}
    359 
    360 		if (WIFEXITED(status)) {
    361 			if (WEXITSTATUS(status) != 0)
    362 				return (WEXITSTATUS(status));
    363 		}
    364 		else if (WIFSIGNALED(status)) {
    365 			warnx("%s: %s", spec, strsignal(WTERMSIG(status)));
    366 			return (1);
    367 		}
    368 		break;
    369 	}
    370 
    371 	return (0);
    372 }
    373 
    374 
    375 static int
    376 selected(const char *type)
    377 {
    378 	struct entry *e;
    379 
    380 	/* If no type specified, it's always selected. */
    381 	TAILQ_FOREACH(e, &selhead, entries)
    382 		if (!strncmp(e->type, type, MFSNAMELEN))
    383 			return which == IN_LIST ? 1 : 0;
    384 
    385 	return which == IN_LIST ? 0 : 1;
    386 }
    387 
    388 
    389 static const char *
    390 getoptions(const char *type)
    391 {
    392 	struct entry *e;
    393 
    394 	TAILQ_FOREACH(e, &opthead, entries)
    395 		if (!strncmp(e->type, type, MFSNAMELEN))
    396 			return e->options;
    397 	return "";
    398 }
    399 
    400 
    401 static void
    402 addoption(char *optstr)
    403 {
    404 	char *newoptions;
    405 	struct entry *e;
    406 
    407 	if ((newoptions = strchr(optstr, ':')) == NULL)
    408 		errx(1, "Invalid option string");
    409 
    410 	*newoptions++ = '\0';
    411 
    412 	TAILQ_FOREACH(e, &opthead, entries)
    413 		if (!strncmp(e->type, optstr, MFSNAMELEN)) {
    414 			catopt(&e->options, newoptions);
    415 			return;
    416 		}
    417 	addentry(&opthead, optstr, newoptions);
    418 }
    419 
    420 
    421 static void
    422 addentry(struct fstypelist *list, const char *type, const char *opts)
    423 {
    424 	struct entry *e;
    425 
    426 	e = emalloc(sizeof(struct entry));
    427 	e->type = estrdup(type);
    428 	e->options = estrdup(opts);
    429 	TAILQ_INSERT_TAIL(list, e, entries);
    430 }
    431 
    432 
    433 static void
    434 maketypelist(char *fslist)
    435 {
    436 	char *ptr;
    437 
    438 	if ((fslist == NULL) || (fslist[0] == '\0'))
    439 		errx(1, "empty type list");
    440 
    441 	if (fslist[0] == 'n' && fslist[1] == 'o') {
    442 		fslist += 2;
    443 		which = NOT_IN_LIST;
    444 	}
    445 	else
    446 		which = IN_LIST;
    447 
    448 	while ((ptr = strsep(&fslist, ",")) != NULL)
    449 		addentry(&selhead, ptr, "");
    450 
    451 }
    452 
    453 
    454 static void
    455 catopt(char **sp, const char *o)
    456 {
    457 	char *s;
    458 	size_t i, j;
    459 
    460 	s = *sp;
    461 	if (s) {
    462 		i = strlen(s);
    463 		j = i + 1 + strlen(o) + 1;
    464 		s = erealloc(s, j);
    465 		(void)snprintf(s + i, j, ",%s", o);
    466 	} else
    467 		s = estrdup(o);
    468 	*sp = s;
    469 }
    470 
    471 
    472 static void
    473 mangle(char *opts, int *argcp, const char ** volatile *argvp, int *maxargcp)
    474 {
    475 	char *p, *s;
    476 	int argc, maxargc;
    477 	const char **argv;
    478 
    479 	argc = *argcp;
    480 	argv = *argvp;
    481 	maxargc = *maxargcp;
    482 
    483 	for (s = opts; (p = strsep(&s, ",")) != NULL;) {
    484 		/* Always leave space for one more argument and the NULL. */
    485 		if (argc >= maxargc - 3) {
    486 			maxargc <<= 1;
    487 			argv = erealloc(argv, maxargc * sizeof(char *));
    488 		}
    489 		if (*p != '\0')  {
    490 			if (*p == '-') {
    491 				argv[argc++] = p;
    492 				p = strchr(p, '=');
    493 				if (p) {
    494 					*p = '\0';
    495 					argv[argc++] = p+1;
    496 				}
    497 			} else {
    498 				argv[argc++] = "-o";
    499 				argv[argc++] = p;
    500 			}
    501 		}
    502 	}
    503 
    504 	*argcp = argc;
    505 	*argvp = argv;
    506 	*maxargcp = maxargc;
    507 }
    508 
    509 static const char *
    510 getfslab(const char *str)
    511 {
    512 	static struct dkwedge_info dkw;
    513 	struct disklabel dl;
    514 	int fd;
    515 	char p;
    516 	const char *vfstype;
    517 	u_char t;
    518 
    519 	/* deduce the file system type from the disk label */
    520 	if ((fd = open(str, O_RDONLY)) == -1)
    521 		err(1, "cannot open `%s'", str);
    522 
    523 	/* First check to see if it's a wedge. */
    524 	if (ioctl(fd, DIOCGWEDGEINFO, &dkw) == 0) {
    525 		/* Yup, this is easy. */
    526 		(void) close(fd);
    527 		return (dkw.dkw_ptype);
    528 	}
    529 
    530 	if (ioctl(fd, DIOCGDINFO, &dl) == -1)
    531 		err(1, "cannot get disklabel for `%s'", str);
    532 
    533 	(void) close(fd);
    534 
    535 	p = str[strlen(str) - 1];
    536 
    537 	if ((p - 'a') >= dl.d_npartitions)
    538 		errx(1, "partition `%s' is not defined on disk", str);
    539 
    540 	if ((t = dl.d_partitions[p - 'a'].p_fstype) >= FSMAXTYPES)
    541 		errx(1, "partition `%s' is not of a legal vfstype",
    542 		    str);
    543 
    544 	if ((vfstype = fscknames[t]) == NULL)
    545 		errx(1, "vfstype `%s' on partition `%s' is not supported",
    546 		    fstypenames[t], str);
    547 
    548 	return vfstype;
    549 }
    550 
    551 
    552 static void
    553 usage(void)
    554 {
    555 	static const char common[] =
    556 	    "[-dfnPpqvy] [-l maxparallel] [-T fstype:fsoptions]\n\t\t[-t fstype]";
    557 
    558 	(void)fprintf(stderr, "usage: %s %s [special|node]...\n",
    559 	    getprogname(), common);
    560 	exit(1);
    561 }
    562