2 * Copyright (c) 1980, 1989, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
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33 * @(#) Copyright (c) 1980, 1989, 1993, 1994 The Regents of the University of California. All rights reserved.
34 * @(#)mount.c 8.25 (Berkeley) 5/8/95
35 * $FreeBSD: src/sbin/mount/mount.c,v 1.39.2.3 2001/08/01 08:26:23 obrien Exp $
36 * $DragonFly: src/sbin/mount/mount.c,v 1.7 2004/08/09 20:15:23 dillon Exp $
39 #include <sys/param.h>
40 #include <sys/mount.h>
56 #include "pathnames.h"
59 #define MOUNT_META_OPTION_FSTAB "fstab"
60 #define MOUNT_META_OPTION_CURRENT "current"
62 int debug, fstab_style, verbose;
64 char *catopt(char *, const char *);
66 *getmntpt(const char *);
67 int hasopt(const char *, const char *);
68 int ismounted(struct fstab *, struct statfs *, int);
69 int isremountable(const char *);
70 void mangle(char *, int *, const char **);
71 char *update_options(char *, char *, int);
72 int mountfs(const char *, const char *, const char *,
73 int, const char *, const char *);
74 void remopt(char *, const char *);
75 void prmount(struct statfs *);
76 void putfsent(const struct statfs *);
78 char *flags2opts(int);
80 /* Map from mount options to printable formats. */
85 { MNT_ASYNC, "asynchronous" },
86 { MNT_EXPORTED, "NFS exported" },
87 { MNT_LOCAL, "local" },
88 { MNT_NOATIME, "noatime" },
89 { MNT_NODEV, "nodev" },
90 { MNT_NOEXEC, "noexec" },
91 { MNT_NOSUID, "nosuid" },
92 { MNT_NOSYMFOLLOW, "nosymfollow" },
93 { MNT_QUOTA, "with quotas" },
94 { MNT_RDONLY, "read-only" },
95 { MNT_SYNCHRONOUS, "synchronous" },
96 { MNT_UNION, "union" },
97 { MNT_NOCLUSTERR, "noclusterr" },
98 { MNT_NOCLUSTERW, "noclusterw" },
99 { MNT_SUIDDIR, "suiddir" },
100 { MNT_SOFTDEP, "soft-updates" },
105 * List of VFS types that can be remounted without becoming mounted on top
107 * XXX Is this list correct?
110 remountable_fs_names[] = {
111 "ufs", "ffs", "ext2fs",
116 main(int argc, char **argv)
118 const char *mntfromname, **vfslist, *vfstype;
120 struct statfs *mntbuf;
123 int all, ch, i, init_flags, mntsize, rval, have_fstab;
126 all = init_flags = 0;
130 while ((ch = getopt(argc, argv, "adfo:prwt:uv")) != -1)
139 init_flags |= MNT_FORCE;
143 options = catopt(options, optarg);
150 options = catopt(options, "ro");
154 errx(1, "only one -t option may be specified");
155 vfslist = makevfslist(optarg);
159 init_flags |= MNT_UPDATE;
165 options = catopt(options, "noro");
175 #define BADTYPE(type) \
176 (strcmp(type, FSTAB_RO) && \
177 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
182 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
183 err(1, "getmntinfo");
185 while ((fs = getfsent()) != NULL) {
186 if (BADTYPE(fs->fs_type))
188 if (checkvfsname(fs->fs_vfstype, vfslist))
190 if (hasopt(fs->fs_mntops, "noauto"))
192 if (!(init_flags & MNT_UPDATE) &&
193 ismounted(fs, mntbuf, mntsize))
195 options = update_options(options,
196 fs->fs_mntops, mntbuf->f_flags);
197 if (mountfs(fs->fs_vfstype, fs->fs_spec,
198 fs->fs_file, init_flags, options,
202 } else if (fstab_style) {
203 for (i = 0; i < mntsize; i++) {
204 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
206 putfsent(&mntbuf[i]);
209 for (i = 0; i < mntsize; i++) {
210 if (checkvfsname(mntbuf[i].f_fstypename,
221 rmslashes(*argv, *argv);
223 if (init_flags & MNT_UPDATE) {
226 if ((mntbuf = getmntpt(*argv)) == NULL)
227 errx(1, "not currently mounted %s", *argv);
229 * Only get the mntflags from fstab if both mntpoint
230 * and mntspec are identical. Also handle the special
231 * case where just '/' is mounted and 'spec' is not
232 * identical with the one from fstab ('/dev' is missing
233 * in the spec-string at boot-time).
235 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
236 if (strcmp(fs->fs_spec,
237 mntbuf->f_mntfromname) == 0 &&
239 mntbuf->f_mntonname) == 0) {
241 mntfromname = mntbuf->f_mntfromname;
242 } else if (argv[0][0] == '/' &&
243 argv[0][1] == '\0') {
246 mntfromname = fs->fs_spec;
250 options = update_options(options, fs->fs_mntops,
253 mntfromname = mntbuf->f_mntfromname;
254 options = update_options(options, NULL,
257 rval = mountfs(mntbuf->f_fstypename, mntfromname,
258 mntbuf->f_mntonname, init_flags, options, 0);
261 if ((fs = getfsfile(*argv)) == NULL &&
262 (fs = getfsspec(*argv)) == NULL)
263 errx(1, "%s: unknown special file or file system",
265 if (BADTYPE(fs->fs_type))
266 errx(1, "%s has unknown file system type",
268 rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
269 init_flags, options, fs->fs_mntops);
273 * If -t flag has not been specified, the path cannot be
274 * found, spec contains either a ':' or a '@', and the
275 * spec is not a file with those characters, then assume
276 * that an NFS filesystem is being specified ala Sun.
278 if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL &&
279 access(argv[0], 0) == -1)
281 rval = mountfs(vfstype,
282 argv[0], argv[1], init_flags, options, NULL);
290 * If the mount was successfully, and done by root, tell mountd the
291 * good news. Pid checks are probably unnecessary, but don't hurt.
293 if (rval == 0 && getuid() == 0 &&
294 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
295 if (fscanf(mountdfp, "%d", &pid) == 1 &&
296 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
297 err(1, "signal mountd");
298 (void)fclose(mountdfp);
305 ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
309 if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
310 /* the root file system can always be remounted */
313 for (i = mntsize - 1; i >= 0; --i)
314 if (strcmp(fs->fs_file, mntbuf[i].f_mntonname) == 0 &&
315 (!isremountable(fs->fs_vfstype) ||
316 strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
322 isremountable(const char *vfsname)
326 for (cp = remountable_fs_names; *cp; cp++)
327 if (strcmp(*cp, vfsname) == 0)
333 hasopt(const char *mntopts, const char *option)
338 if (option[0] == 'n' && option[1] == 'o') {
343 optbuf = strdup(mntopts);
345 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
346 if (opt[0] == 'n' && opt[1] == 'o') {
347 if (!strcasecmp(opt + 2, option))
349 } else if (!strcasecmp(opt, option))
357 mountfs(const char *vfstype, const char *spec, const char *name, int flags,
358 const char *options, const char *mntopts)
360 /* List of directories containing mount_xxx subcommands. */
361 static const char *edirs[] = {
366 const char *argv[100], **edir;
370 char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
377 /* resolve the mountpoint with realpath(3) */
378 (void)checkpath(name, mntpath);
383 if (options == NULL) {
384 if (*mntopts == '\0') {
391 optbuf = catopt(strdup(mntopts), options);
393 if (strcmp(name, "/") == 0)
395 if (flags & MNT_FORCE)
396 optbuf = catopt(optbuf, "force");
397 if (flags & MNT_RDONLY)
398 optbuf = catopt(optbuf, "ro");
401 * The mount_mfs (newfs) command uses -o to select the
402 * optimization mode. We don't pass the default "-o rw"
405 if (flags & MNT_UPDATE)
406 optbuf = catopt(optbuf, "update");
409 argv[argc++] = vfstype;
410 mangle(optbuf, &argc, argv);
416 (void)printf("exec: mount_%s", vfstype);
417 for (i = 1; i < argc; i++)
418 (void)printf(" %s", argv[i]);
423 switch (pid = fork()) {
424 case -1: /* Error. */
429 if (strcmp(vfstype, "ufs") == 0)
430 exit(mount_ufs(argc, (char * const *) argv));
432 /* Go find an executable. */
433 for (edir = edirs; *edir; edir++) {
434 (void)snprintf(execname,
435 sizeof(execname), "%s/mount_%s", *edir, vfstype);
436 execv(execname, (char * const *)argv);
438 if (errno == ENOENT) {
441 for (edir = edirs; *edir; edir++)
442 len += strlen(*edir) + 2; /* ", " */
443 if ((cp = malloc(len)) == NULL)
444 errx(1, "malloc failed");
446 for (edir = edirs; *edir; edir++) {
451 warn("exec mount_%s not found in %s", vfstype, cp);
455 default: /* Parent. */
458 if (waitpid(pid, &status, 0) < 0) {
463 if (WIFEXITED(status)) {
464 if (WEXITSTATUS(status) != 0)
465 return (WEXITSTATUS(status));
466 } else if (WIFSIGNALED(status)) {
467 warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
472 if (statfs(name, &sf) < 0) {
473 warn("statfs %s", name);
488 prmount(struct statfs *sfp)
494 (void)printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
497 flags = sfp->f_flags & MNT_VISFLAGMASK;
498 for (o = optnames; flags && o->o_opt; o++)
499 if (flags & o->o_opt) {
500 (void)printf(", %s", o->o_name);
504 (void)printf(", mounted by ");
505 if ((pw = getpwuid(sfp->f_owner)) != NULL)
506 (void)printf("%s", pw->pw_name);
508 (void)printf("%d", sfp->f_owner);
511 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
512 (void)printf(", writes: sync %ld async %ld",
513 sfp->f_syncwrites, sfp->f_asyncwrites);
514 if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
515 (void)printf(", reads: sync %ld async %ld",
516 sfp->f_syncreads, sfp->f_asyncreads);
522 getmntpt(const char *name)
524 struct statfs *mntbuf;
527 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
528 for (i = mntsize - 1; i >= 0; i--) {
529 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
530 strcmp(mntbuf[i].f_mntonname, name) == 0)
537 catopt(char *s0, const char *s1)
542 if (s1 == NULL || *s1 == '\0')
546 i = strlen(s0) + strlen(s1) + 1 + 1;
547 if ((cp = malloc(i)) == NULL)
548 errx(1, "malloc failed");
549 (void)snprintf(cp, i, "%s,%s", s0, s1);
559 mangle(char *options, int *argcp, const char **argv)
565 for (s = options; (p = strsep(&s, ",")) != NULL;)
574 } else if (strcmp(p, "rw") != 0) {
585 update_options(char *opts, char *fstab, int curflags)
589 char *expopt, *newopt, *tmpopt;
594 /* remove meta options from list */
595 remopt(fstab, MOUNT_META_OPTION_FSTAB);
596 remopt(fstab, MOUNT_META_OPTION_CURRENT);
597 cur = flags2opts(curflags);
600 * Expand all meta-options passed to us first.
603 for (p = opts; (o = strsep(&p, ",")) != NULL;) {
604 if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
605 expopt = catopt(expopt, fstab);
606 else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
607 expopt = catopt(expopt, cur);
609 expopt = catopt(expopt, o);
615 * Remove previous contradictory arguments. Given option "foo" we
616 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
617 * and "foo" - so we can deal with possible options like "notice".
620 for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
621 if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
622 errx(1, "malloc failed");
624 strcpy(tmpopt, "no");
626 remopt(newopt, tmpopt);
629 if (strncmp("no", o, 2) == 0)
632 newopt = catopt(newopt, o);
640 remopt(char *string, const char *opt)
644 if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
649 for (p = string; (o = strsep(&p, ",")) != NULL;) {
650 if (strcmp(opt, o) != 0) {
651 if (*r == ',' && *o != '\0')
653 while ((*r++ = *o++) != '\0')
665 (void)fprintf(stderr, "%s\n%s\n%s\n",
666 "usage: mount [-dfpruvw] [-o options] [-t ufs | external_type] special node",
667 " mount [-adfpruvw] [-o options] [-t ufs | external_type]",
668 " mount [-dfpruvw] special | node");
673 putfsent(const struct statfs *ent)
678 opts = flags2opts(ent->f_flags);
679 printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
680 ent->f_fstypename, opts);
683 if ((fst = getfsspec(ent->f_mntfromname)))
684 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
685 else if ((fst = getfsfile(ent->f_mntonname)))
686 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
687 else if (strcmp(ent->f_fstypename, "ufs") == 0) {
688 if (strcmp(ent->f_mntonname, "/") == 0)
698 flags2opts(int flags)
704 res = catopt(res, (flags & MNT_RDONLY) ? "ro" : "rw");
706 if (flags & MNT_SYNCHRONOUS) res = catopt(res, "sync");
707 if (flags & MNT_NOEXEC) res = catopt(res, "noexec");
708 if (flags & MNT_NOSUID) res = catopt(res, "nosuid");
709 if (flags & MNT_NODEV) res = catopt(res, "nodev");
710 if (flags & MNT_UNION) res = catopt(res, "union");
711 if (flags & MNT_ASYNC) res = catopt(res, "async");
712 if (flags & MNT_NOATIME) res = catopt(res, "noatime");
713 if (flags & MNT_NOCLUSTERR) res = catopt(res, "noclusterr");
714 if (flags & MNT_NOCLUSTERW) res = catopt(res, "noclusterw");
715 if (flags & MNT_NOSYMFOLLOW) res = catopt(res, "nosymfollow");
716 if (flags & MNT_SUIDDIR) res = catopt(res, "suiddir");