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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13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
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18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
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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 1.10 2005/04/03 17:13:08 joerg Exp $
39 #include <sys/param.h>
40 #include <sys/mount.h>
41 #include <sys/mountctl.h>
57 #include "pathnames.h"
60 #define MOUNT_META_OPTION_FSTAB "fstab"
61 #define MOUNT_META_OPTION_CURRENT "current"
63 int debug, fstab_style, verbose;
65 static char *catopt(char *, const char *);
67 *getmntpt(const char *);
68 static int hasopt(const char *, const char *);
69 static int ismounted(struct fstab *, struct statfs *, int);
70 static int isremountable(const char *);
71 static void mangle(char *, int *, const char **);
72 static char *update_options(char *, char *, int);
73 static int mountfs(const char *, const char *, const char *,
74 int, const char *, const char *);
75 static void remopt(char *, const char *);
76 static void printdefvals(const struct statfs *);
77 static void prmount(struct statfs *);
78 static void putfsent(const struct statfs *);
79 static void usage(void);
80 static char *flags2opts(int);
81 static char *xstrdup(const char *str);
84 * List of VFS types that can be remounted without becoming mounted on top
86 * XXX Is this list correct?
89 remountable_fs_names[] = {
90 "ufs", "ffs", "ext2fs",
95 main(int argc, char **argv)
97 const char *mntfromname, **vfslist, *vfstype;
99 struct statfs *mntbuf;
102 int all, ch, i, init_flags, mntsize, rval, have_fstab;
105 all = init_flags = 0;
109 while ((ch = getopt(argc, argv, "adfo:prwt:uv")) != -1)
118 init_flags |= MNT_FORCE;
122 options = catopt(options, optarg);
129 options = catopt(options, "ro");
133 errx(1, "only one -t option may be specified");
134 vfslist = makevfslist(optarg);
138 init_flags |= MNT_UPDATE;
144 options = catopt(options, "noro");
154 #define BADTYPE(type) \
155 (strcmp(type, FSTAB_RO) && \
156 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
161 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
162 err(1, "getmntinfo");
164 while ((fs = getfsent()) != NULL) {
165 if (BADTYPE(fs->fs_type))
167 if (checkvfsname(fs->fs_vfstype, vfslist))
169 if (hasopt(fs->fs_mntops, "noauto"))
171 if (!(init_flags & MNT_UPDATE) &&
172 ismounted(fs, mntbuf, mntsize))
174 options = update_options(options,
175 fs->fs_mntops, mntbuf->f_flags);
176 if (mountfs(fs->fs_vfstype, fs->fs_spec,
177 fs->fs_file, init_flags, options,
181 } else if (fstab_style) {
182 for (i = 0; i < mntsize; i++) {
183 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
185 putfsent(&mntbuf[i]);
188 for (i = 0; i < mntsize; i++) {
189 if (checkvfsname(mntbuf[i].f_fstypename,
200 rmslashes(*argv, *argv);
202 if (init_flags & MNT_UPDATE) {
205 if ((mntbuf = getmntpt(*argv)) == NULL)
206 errx(1, "not currently mounted %s", *argv);
208 * Only get the mntflags from fstab if both mntpoint
209 * and mntspec are identical. Also handle the special
210 * case where just '/' is mounted and 'spec' is not
211 * identical with the one from fstab ('/dev' is missing
212 * in the spec-string at boot-time).
214 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
215 if (strcmp(fs->fs_spec,
216 mntbuf->f_mntfromname) == 0 &&
218 mntbuf->f_mntonname) == 0) {
220 mntfromname = mntbuf->f_mntfromname;
221 } else if (argv[0][0] == '/' &&
222 argv[0][1] == '\0') {
225 mntfromname = fs->fs_spec;
229 options = update_options(options, fs->fs_mntops,
232 mntfromname = mntbuf->f_mntfromname;
233 options = update_options(options, NULL,
236 rval = mountfs(mntbuf->f_fstypename, mntfromname,
237 mntbuf->f_mntonname, init_flags, options, 0);
240 if ((fs = getfsfile(*argv)) == NULL &&
241 (fs = getfsspec(*argv)) == NULL)
242 errx(1, "%s: unknown special file or file system",
244 if (BADTYPE(fs->fs_type))
245 errx(1, "%s has unknown file system type",
247 rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
248 init_flags, options, fs->fs_mntops);
252 * If -t flag has not been specified, the path cannot be
253 * found, spec contains either a ':' or a '@', and the
254 * spec is not a file with those characters, then assume
255 * that an NFS filesystem is being specified ala Sun.
257 if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL &&
258 access(argv[0], 0) == -1)
260 rval = mountfs(vfstype, getdevpath(argv[0], 0), argv[1],
261 init_flags, options, NULL);
269 * If the mount was successfully, and done by root, tell mountd the
270 * good news. Pid checks are probably unnecessary, but don't hurt.
272 if (rval == 0 && getuid() == 0 &&
273 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
274 if (fscanf(mountdfp, "%d", &pid) == 1 &&
275 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
276 err(1, "signal mountd");
284 ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
288 if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
289 /* the root file system can always be remounted */
292 for (i = mntsize - 1; i >= 0; --i)
293 if (strcmp(fs->fs_file, mntbuf[i].f_mntonname) == 0 &&
294 (!isremountable(fs->fs_vfstype) ||
295 strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
301 isremountable(const char *vfsname)
305 for (cp = remountable_fs_names; *cp; cp++)
306 if (strcmp(*cp, vfsname) == 0)
312 hasopt(const char *mntopts, const char *option)
317 if (option[0] == 'n' && option[1] == 'o') {
322 optbuf = xstrdup(mntopts);
324 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
325 if (opt[0] == 'n' && opt[1] == 'o') {
326 if (!strcasecmp(opt + 2, option))
328 } else if (!strcasecmp(opt, option))
336 mountfs(const char *vfstype, const char *spec, const char *name, int flags,
337 const char *options, const char *mntopts)
339 /* List of directories containing mount_xxx subcommands. */
340 static const char *edirs[] = {
345 const char *argv[100], **edir;
349 char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
356 /* resolve the mountpoint with realpath(3) */
357 checkpath(name, mntpath);
362 if (options == NULL) {
363 if (*mntopts == '\0') {
370 optbuf = catopt(xstrdup(mntopts), options);
372 if (strcmp(name, "/") == 0)
374 if (flags & MNT_FORCE)
375 optbuf = catopt(optbuf, "force");
376 if (flags & MNT_RDONLY)
377 optbuf = catopt(optbuf, "ro");
380 * The mount_mfs (newfs) command uses -o to select the
381 * optimization mode. We don't pass the default "-o rw"
384 if (flags & MNT_UPDATE)
385 optbuf = catopt(optbuf, "update");
388 argv[argc++] = vfstype;
389 mangle(optbuf, &argc, argv);
395 printf("exec: mount_%s", vfstype);
396 for (i = 1; i < argc; i++)
397 printf(" %s", argv[i]);
402 switch (pid = fork()) {
403 case -1: /* Error. */
408 if (strcmp(vfstype, "ufs") == 0)
409 exit(mount_ufs(argc, argv));
411 /* Go find an executable. */
412 for (edir = edirs; *edir; edir++) {
414 sizeof(execname), "%s/mount_%s", *edir, vfstype);
415 execv(execname, __DECONST(char * const *, argv));
417 if (errno == ENOENT) {
420 for (edir = edirs; *edir; edir++)
421 len += strlen(*edir) + 2; /* ", " */
422 if ((cp = malloc(len)) == NULL)
423 errx(1, "malloc failed");
425 for (edir = edirs; *edir; edir++) {
430 warn("exec mount_%s not found in %s", vfstype, cp);
434 default: /* Parent. */
437 if (waitpid(pid, &status, 0) < 0) {
442 if (WIFEXITED(status)) {
443 if (WEXITSTATUS(status) != 0)
444 return (WEXITSTATUS(status));
445 } else if (WIFSIGNALED(status)) {
446 warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
451 if (statfs(name, &sf) < 0) {
452 warn("statfs %s", name);
467 prmount(struct statfs *sfp)
477 if ((buf = malloc(len)) == NULL)
478 errx(1, "malloc failed");
480 printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
483 /* Get a string buffer with all the used flags names */
484 error = mountctl(sfp->f_mntonname, MOUNTCTL_MOUNTFLAGS,
485 -1, NULL, 0, buf, len);
488 printf(", mounted by ");
489 if ((pw = getpwuid(sfp->f_owner)) != NULL)
490 printf("%s", pw->pw_name);
492 printf("%d", sfp->f_owner);
499 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
500 printf(", writes: sync %ld async %ld",
501 sfp->f_syncwrites, sfp->f_asyncwrites);
502 if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
503 printf(", reads: sync %ld async %ld",
504 sfp->f_syncreads, sfp->f_asyncreads);
509 static struct statfs *
510 getmntpt(const char *name)
512 struct statfs *mntbuf;
515 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
516 for (i = mntsize - 1; i >= 0; i--) {
517 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
518 strcmp(mntbuf[i].f_mntonname, name) == 0)
525 catopt(char *s0, const char *s1)
530 if (s1 == NULL || *s1 == '\0')
534 i = strlen(s0) + strlen(s1) + 1 + 1;
535 if ((cp = malloc(i)) == NULL)
536 errx(1, "malloc failed");
537 snprintf(cp, i, "%s,%s", s0, s1);
547 mangle(char *options, int *argcp, const char **argv)
553 for (s = options; (p = strsep(&s, ",")) != NULL;)
562 } else if (strcmp(p, "rw") != 0) {
573 update_options(char *opts, char *fstab, int curflags)
577 char *expopt, *newopt, *tmpopt;
582 /* remove meta options from list */
583 remopt(fstab, MOUNT_META_OPTION_FSTAB);
584 remopt(fstab, MOUNT_META_OPTION_CURRENT);
585 cur = flags2opts(curflags);
588 * Expand all meta-options passed to us first.
591 for (p = opts; (o = strsep(&p, ",")) != NULL;) {
592 if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
593 expopt = catopt(expopt, fstab);
594 else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
595 expopt = catopt(expopt, cur);
597 expopt = catopt(expopt, o);
603 * Remove previous contradictory arguments. Given option "foo" we
604 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
605 * and "foo" - so we can deal with possible options like "notice".
608 for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
609 if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
610 errx(1, "malloc failed");
612 strcpy(tmpopt, "no");
614 remopt(newopt, tmpopt);
617 if (strncmp("no", o, 2) == 0)
620 newopt = catopt(newopt, o);
628 remopt(char *string, const char *opt)
632 if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
637 for (p = string; (o = strsep(&p, ",")) != NULL;) {
638 if (strcmp(opt, o) != 0) {
639 if (*r == ',' && *o != '\0')
641 while ((*r++ = *o++) != '\0')
653 fprintf(stderr, "%s\n%s\n%s\n",
654 "usage: mount [-adfpruvw] [-o options] [-t type]",
655 " mount [-dfpruvw] {special | node}",
656 " mount [-dfpruvw] [-o options] [-t type] special node");
661 * Prints the default values for dump frequency and pass number of fsck.
662 * This happens when mount(8) is called with -p and there is no fstab file
663 * or there is but the values aren't specified.
666 printdefvals(const struct statfs *ent)
668 if (strcmp(ent->f_fstypename, "ufs") == 0) {
669 if (strcmp(ent->f_mntonname, "/") == 0)
679 putfsent(const struct statfs *ent)
685 opts = flags2opts(ent->f_flags);
686 printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
687 ent->f_fstypename, opts);
691 * If fstab file is missing don't call getfsspec() or getfsfile()
692 * at all, because the same warning will be printed twice for every
693 * mounted filesystem.
695 if (stat(_PATH_FSTAB, &sb) != -1) {
696 if ((fst = getfsspec(ent->f_mntfromname)))
697 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
698 else if ((fst = getfsfile(ent->f_mntonname)))
699 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
709 flags2opts(int flags)
715 res = catopt(res, (flags & MNT_RDONLY) ? "ro" : "rw");
717 if (flags & MNT_SYNCHRONOUS) res = catopt(res, "sync");
718 if (flags & MNT_NOEXEC) res = catopt(res, "noexec");
719 if (flags & MNT_NOSUID) res = catopt(res, "nosuid");
720 if (flags & MNT_NODEV) res = catopt(res, "nodev");
721 if (flags & MNT_UNION) res = catopt(res, "union");
722 if (flags & MNT_ASYNC) res = catopt(res, "async");
723 if (flags & MNT_NOATIME) res = catopt(res, "noatime");
724 if (flags & MNT_NOCLUSTERR) res = catopt(res, "noclusterr");
725 if (flags & MNT_NOCLUSTERW) res = catopt(res, "noclusterw");
726 if (flags & MNT_NOSYMFOLLOW) res = catopt(res, "nosymfollow");
727 if (flags & MNT_SUIDDIR) res = catopt(res, "suiddir");
728 if (flags & MNT_IGNORE) res = catopt(res, "ignore");
734 xstrdup(const char *str)
736 char* ret = strdup(str);
738 errx(1, "strdup failed (could not allocate memory)");