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
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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, "adF:fo:prwt:uv")) != -1)
121 init_flags |= MNT_FORCE;
125 options = catopt(options, optarg);
132 options = catopt(options, "ro");
136 errx(1, "only one -t option may be specified");
137 vfslist = makevfslist(optarg);
141 init_flags |= MNT_UPDATE;
147 options = catopt(options, "noro");
157 #define BADTYPE(type) \
158 (strcmp(type, FSTAB_RO) && \
159 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
164 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
165 err(1, "getmntinfo");
167 while ((fs = getfsent()) != NULL) {
168 if (BADTYPE(fs->fs_type))
170 if (checkvfsname(fs->fs_vfstype, vfslist))
172 if (hasopt(fs->fs_mntops, "noauto"))
174 if (!(init_flags & MNT_UPDATE) &&
175 ismounted(fs, mntbuf, mntsize))
177 options = update_options(options,
178 fs->fs_mntops, mntbuf->f_flags);
179 if (mountfs(fs->fs_vfstype, fs->fs_spec,
180 fs->fs_file, init_flags, options,
184 } else if (fstab_style) {
185 for (i = 0; i < mntsize; i++) {
186 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
188 putfsent(&mntbuf[i]);
191 for (i = 0; i < mntsize; i++) {
192 if (checkvfsname(mntbuf[i].f_fstypename,
203 rmslashes(*argv, *argv);
205 if (init_flags & MNT_UPDATE) {
208 if ((mntbuf = getmntpt(*argv)) == NULL)
209 errx(1, "not currently mounted %s", *argv);
211 * Only get the mntflags from fstab if both mntpoint
212 * and mntspec are identical. Also handle the special
213 * case where just '/' is mounted and 'spec' is not
214 * identical with the one from fstab ('/dev' is missing
215 * in the spec-string at boot-time).
217 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
218 if (strcmp(fs->fs_spec,
219 mntbuf->f_mntfromname) == 0 &&
221 mntbuf->f_mntonname) == 0) {
223 mntfromname = mntbuf->f_mntfromname;
224 } else if (argv[0][0] == '/' &&
225 argv[0][1] == '\0') {
228 mntfromname = fs->fs_spec;
232 options = update_options(options, fs->fs_mntops,
235 mntfromname = mntbuf->f_mntfromname;
236 options = update_options(options, NULL,
239 rval = mountfs(mntbuf->f_fstypename, mntfromname,
240 mntbuf->f_mntonname, init_flags, options, 0);
243 if ((fs = getfsfile(*argv)) == NULL &&
244 (fs = getfsspec(*argv)) == NULL)
245 errx(1, "%s: unknown special file or file system",
247 if (BADTYPE(fs->fs_type))
248 errx(1, "%s has unknown file system type",
250 rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
251 init_flags, options, fs->fs_mntops);
255 * If -t flag has not been specified, the path cannot be
256 * found, spec contains either a ':' or a '@', and the
257 * spec is not a file with those characters, then assume
258 * that an NFS filesystem is being specified ala Sun.
260 if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL &&
261 access(argv[0], 0) == -1)
263 rval = mountfs(vfstype, getdevpath(argv[0], 0), argv[1],
264 init_flags, options, NULL);
272 * If the mount was successfully, and done by root, tell mountd the
273 * good news. Pid checks are probably unnecessary, but don't hurt.
275 if (rval == 0 && getuid() == 0 &&
276 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
277 if (fscanf(mountdfp, "%d", &pid) == 1 &&
278 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
279 err(1, "signal mountd");
287 ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
291 if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
292 /* the root file system can always be remounted */
295 for (i = mntsize - 1; i >= 0; --i)
296 if (strcmp(fs->fs_file, mntbuf[i].f_mntonname) == 0 &&
297 (!isremountable(fs->fs_vfstype) ||
298 strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
304 isremountable(const char *vfsname)
308 for (cp = remountable_fs_names; *cp; cp++)
309 if (strcmp(*cp, vfsname) == 0)
315 hasopt(const char *mntopts, const char *option)
320 if (option[0] == 'n' && option[1] == 'o') {
325 optbuf = xstrdup(mntopts);
327 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
328 if (opt[0] == 'n' && opt[1] == 'o') {
329 if (!strcasecmp(opt + 2, option))
331 } else if (!strcasecmp(opt, option))
339 mountfs(const char *vfstype, const char *spec, const char *name, int flags,
340 const char *options, const char *mntopts)
342 /* List of directories containing mount_xxx subcommands. */
343 static const char *edirs[] = {
348 const char *argv[100], **edir;
352 char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
359 /* resolve the mountpoint with realpath(3) */
360 checkpath(name, mntpath);
365 if (options == NULL) {
366 if (*mntopts == '\0') {
373 optbuf = catopt(xstrdup(mntopts), options);
375 if (strcmp(name, "/") == 0)
377 if (flags & MNT_FORCE)
378 optbuf = catopt(optbuf, "force");
379 if (flags & MNT_RDONLY)
380 optbuf = catopt(optbuf, "ro");
383 * The mount_mfs (newfs) command uses -o to select the
384 * optimization mode. We don't pass the default "-o rw"
387 if (flags & MNT_UPDATE)
388 optbuf = catopt(optbuf, "update");
391 argv[argc++] = vfstype;
392 mangle(optbuf, &argc, argv);
398 printf("exec: mount_%s", vfstype);
399 for (i = 1; i < argc; i++)
400 printf(" %s", argv[i]);
405 switch (pid = fork()) {
406 case -1: /* Error. */
411 if (strcmp(vfstype, "ufs") == 0)
412 exit(mount_ufs(argc, argv));
414 /* Go find an executable. */
415 for (edir = edirs; *edir; edir++) {
417 sizeof(execname), "%s/mount_%s", *edir, vfstype);
418 execv(execname, __DECONST(char * const *, argv));
420 if (errno == ENOENT) {
423 for (edir = edirs; *edir; edir++)
424 len += strlen(*edir) + 2; /* ", " */
425 if ((cp = malloc(len)) == NULL)
426 errx(1, "malloc failed");
428 for (edir = edirs; *edir; edir++) {
433 warn("exec mount_%s not found in %s", vfstype, cp);
437 default: /* Parent. */
440 if (waitpid(pid, &status, 0) < 0) {
445 if (WIFEXITED(status)) {
446 if (WEXITSTATUS(status) != 0)
447 return (WEXITSTATUS(status));
448 } else if (WIFSIGNALED(status)) {
449 warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
454 if (statfs(name, &sf) < 0) {
455 warn("statfs %s", name);
470 prmount(struct statfs *sfp)
480 if ((buf = malloc(len)) == NULL)
481 errx(1, "malloc failed");
483 printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
486 /* Get a string buffer with all the used flags names */
487 error = mountctl(sfp->f_mntonname, MOUNTCTL_MOUNTFLAGS,
488 -1, NULL, 0, buf, len);
491 printf(", mounted by ");
492 if ((pw = getpwuid(sfp->f_owner)) != NULL)
493 printf("%s", pw->pw_name);
495 printf("%d", sfp->f_owner);
502 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
503 printf(", writes: sync %ld async %ld",
504 sfp->f_syncwrites, sfp->f_asyncwrites);
505 if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
506 printf(", reads: sync %ld async %ld",
507 sfp->f_syncreads, sfp->f_asyncreads);
512 static struct statfs *
513 getmntpt(const char *name)
515 struct statfs *mntbuf;
518 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
519 for (i = mntsize - 1; i >= 0; i--) {
520 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
521 strcmp(mntbuf[i].f_mntonname, name) == 0)
528 catopt(char *s0, const char *s1)
533 if (s1 == NULL || *s1 == '\0')
537 i = strlen(s0) + strlen(s1) + 1 + 1;
538 if ((cp = malloc(i)) == NULL)
539 errx(1, "malloc failed");
540 snprintf(cp, i, "%s,%s", s0, s1);
550 mangle(char *options, int *argcp, const char **argv)
556 for (s = options; (p = strsep(&s, ",")) != NULL;)
565 } else if (strcmp(p, "rw") != 0) {
576 update_options(char *opts, char *fstab, int curflags)
580 char *expopt, *newopt, *tmpopt;
585 /* remove meta options from list */
586 remopt(fstab, MOUNT_META_OPTION_FSTAB);
587 remopt(fstab, MOUNT_META_OPTION_CURRENT);
588 cur = flags2opts(curflags);
591 * Expand all meta-options passed to us first.
594 for (p = opts; (o = strsep(&p, ",")) != NULL;) {
595 if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
596 expopt = catopt(expopt, fstab);
597 else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
598 expopt = catopt(expopt, cur);
600 expopt = catopt(expopt, o);
606 * Remove previous contradictory arguments. Given option "foo" we
607 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
608 * and "foo" - so we can deal with possible options like "notice".
611 for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
612 if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
613 errx(1, "malloc failed");
615 strcpy(tmpopt, "no");
617 remopt(newopt, tmpopt);
620 if (strncmp("no", o, 2) == 0)
623 newopt = catopt(newopt, o);
631 remopt(char *string, const char *opt)
635 if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
640 for (p = string; (o = strsep(&p, ",")) != NULL;) {
641 if (strcmp(opt, o) != 0) {
642 if (*r == ',' && *o != '\0')
644 while ((*r++ = *o++) != '\0')
656 fprintf(stderr, "%s\n%s\n%s\n",
657 "usage: mount [-adfpruvw] [-F fstab] [-o options] [-t type]",
658 " mount [-dfpruvw] {special | node}",
659 " mount [-dfpruvw] [-o options] [-t type] special node");
664 * Prints the default values for dump frequency and pass number of fsck.
665 * This happens when mount(8) is called with -p and there is no fstab file
666 * or there is but the values aren't specified.
669 printdefvals(const struct statfs *ent)
671 if (strcmp(ent->f_fstypename, "ufs") == 0) {
672 if (strcmp(ent->f_mntonname, "/") == 0)
682 putfsent(const struct statfs *ent)
688 opts = flags2opts(ent->f_flags);
689 printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
690 ent->f_fstypename, opts);
694 * If fstab file is missing don't call getfsspec() or getfsfile()
695 * at all, because the same warning will be printed twice for every
696 * mounted filesystem.
698 if (stat(_PATH_FSTAB, &sb) != -1) {
699 if ((fst = getfsspec(ent->f_mntfromname)))
700 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
701 else if ((fst = getfsfile(ent->f_mntonname)))
702 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
712 flags2opts(int flags)
718 res = catopt(res, (flags & MNT_RDONLY) ? "ro" : "rw");
720 if (flags & MNT_SYNCHRONOUS) res = catopt(res, "sync");
721 if (flags & MNT_NOEXEC) res = catopt(res, "noexec");
722 if (flags & MNT_NOSUID) res = catopt(res, "nosuid");
723 if (flags & MNT_NODEV) res = catopt(res, "nodev");
724 if (flags & MNT_UNION) res = catopt(res, "union");
725 if (flags & MNT_ASYNC) res = catopt(res, "async");
726 if (flags & MNT_NOATIME) res = catopt(res, "noatime");
727 if (flags & MNT_NOCLUSTERR) res = catopt(res, "noclusterr");
728 if (flags & MNT_NOCLUSTERW) res = catopt(res, "noclusterw");
729 if (flags & MNT_NOSYMFOLLOW) res = catopt(res, "nosymfollow");
730 if (flags & MNT_SUIDDIR) res = catopt(res, "suiddir");
731 if (flags & MNT_IGNORE) res = catopt(res, "ignore");
737 xstrdup(const char *str)
739 char* ret = strdup(str);
741 errx(1, "strdup failed (could not allocate memory)");