2 * Copyright (c) 1980, 1989, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 static const char copyright[] =
32 "@(#) Copyright (c) 1980, 1989, 1993, 1994\n\
33 The Regents of the University of California. All rights reserved.\n";
38 static char sccsid[] = "@(#)mount.c 8.25 (Berkeley) 5/8/95";
40 static const char rcsid[] =
44 #include <sys/param.h>
45 #include <sys/mount.h>
64 #include "pathnames.h"
67 #define MOUNT_META_OPTION_FSTAB "fstab"
68 #define MOUNT_META_OPTION_CURRENT "current"
70 int debug, fstab_style, verbose;
72 char *catopt(char *, const char *);
73 struct statfs *getmntpt(const char *);
74 int hasopt(const char *, const char *);
75 int ismounted(struct fstab *, struct statfs *, int);
76 int isremountable(const char *);
77 void mangle(char *, int *, char **);
78 char *update_options(char *, char *, int);
79 int mountfs(const char *, const char *, const char *,
80 int, const char *, const char *);
81 void remopt(char *, const char *);
82 void prmount(struct statfs *);
83 void putfsent(const struct statfs *);
85 char *flags2opts(int);
87 /* Map from mount options to printable formats. */
92 { MNT_ASYNC, "asynchronous" },
93 { MNT_EXPORTED, "NFS exported" },
94 { MNT_LOCAL, "local" },
95 { MNT_NOATIME, "noatime" },
96 { MNT_NOEXEC, "noexec" },
97 { MNT_NOSUID, "nosuid" },
98 { MNT_NOSYMFOLLOW, "nosymfollow" },
99 { MNT_QUOTA, "with quotas" },
100 { MNT_RDONLY, "read-only" },
101 { MNT_SYNCHRONOUS, "synchronous" },
102 { MNT_UNION, "union" },
103 { MNT_NOCLUSTERR, "noclusterr" },
104 { MNT_NOCLUSTERW, "noclusterw" },
105 { MNT_SUIDDIR, "suiddir" },
106 { MNT_SOFTDEP, "soft-updates" },
107 { MNT_MULTILABEL, "multilabel" },
108 { MNT_ACLS, "acls" },
113 * List of VFS types that can be remounted without becoming mounted on top
115 * XXX Is this list correct?
118 remountable_fs_names[] = {
119 "ufs", "ffs", "ext2fs",
123 static const char userquotaeq[] = "userquota=";
124 static const char groupquotaeq[] = "groupquota=";
127 use_mountprog(const char *vfstype)
129 /* XXX: We need to get away from implementing external mount
130 * programs for every filesystem, and move towards having
131 * each filesystem properly implement the nmount() system call.
135 "cd9660", "mfs", "msdosfs", "nfs", "nfs4", "ntfs",
136 "nwfs", "nullfs", "portalfs", "smbfs", "udf", "umapfs",
141 for (i=0; fs[i] != NULL; ++i) {
142 if (strcmp(vfstype, fs[i]) == 0)
150 exec_mountprog(const char *name, const char *execname,
156 switch (pid = fork()) {
157 case -1: /* Error. */
161 /* Go find an executable. */
162 execvP(execname, _PATH_SYSPATH, argv);
163 if (errno == ENOENT) {
164 warn("exec %s not found in %s", execname,
168 default: /* Parent. */
169 if (waitpid(pid, &status, 0) < 0) {
174 if (WIFEXITED(status)) {
175 if (WEXITSTATUS(status) != 0)
176 return (WEXITSTATUS(status));
177 } else if (WIFSIGNALED(status)) {
178 warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
188 main(int argc, char *argv[])
190 const char *mntfromname, **vfslist, *vfstype;
192 struct statfs *mntbuf;
195 int all, ch, i, init_flags, mntsize, rval, have_fstab, ro;
196 char *cp, *ep, *options;
198 all = init_flags = 0;
203 while ((ch = getopt(argc, argv, "adF:fo:prwt:uv")) != -1)
215 init_flags |= MNT_FORCE;
219 options = catopt(options, optarg);
226 options = catopt(options, "ro");
231 errx(1, "only one -t option may be specified");
232 vfslist = makevfslist(optarg);
236 init_flags |= MNT_UPDATE;
242 options = catopt(options, "noro");
252 #define BADTYPE(type) \
253 (strcmp(type, FSTAB_RO) && \
254 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
256 if ((init_flags & MNT_UPDATE) && (ro == 0))
257 options = catopt(options, "noro");
262 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
263 err(1, "getmntinfo");
265 while ((fs = getfsent()) != NULL) {
266 if (BADTYPE(fs->fs_type))
268 if (checkvfsname(fs->fs_vfstype, vfslist))
270 if (hasopt(fs->fs_mntops, "noauto"))
272 if (!(init_flags & MNT_UPDATE) &&
273 ismounted(fs, mntbuf, mntsize))
275 options = update_options(options, fs->fs_mntops,
277 if (mountfs(fs->fs_vfstype, fs->fs_spec,
278 fs->fs_file, init_flags, options,
282 } else if (fstab_style) {
283 for (i = 0; i < mntsize; i++) {
284 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
286 putfsent(&mntbuf[i]);
289 for (i = 0; i < mntsize; i++) {
290 if (checkvfsname(mntbuf[i].f_fstypename,
301 rmslashes(*argv, *argv);
302 if (init_flags & MNT_UPDATE) {
305 if ((mntbuf = getmntpt(*argv)) == NULL)
306 errx(1, "not currently mounted %s", *argv);
308 * Only get the mntflags from fstab if both mntpoint
309 * and mntspec are identical. Also handle the special
310 * case where just '/' is mounted and 'spec' is not
311 * identical with the one from fstab ('/dev' is missing
312 * in the spec-string at boot-time).
314 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
315 if (strcmp(fs->fs_spec,
316 mntbuf->f_mntfromname) == 0 &&
318 mntbuf->f_mntonname) == 0) {
320 mntfromname = mntbuf->f_mntfromname;
321 } else if (argv[0][0] == '/' &&
322 argv[0][1] == '\0') {
325 mntfromname = fs->fs_spec;
329 options = update_options(options, fs->fs_mntops,
332 mntfromname = mntbuf->f_mntfromname;
333 options = update_options(options, NULL,
336 rval = mountfs(mntbuf->f_fstypename, mntfromname,
337 mntbuf->f_mntonname, init_flags, options, 0);
340 if ((fs = getfsfile(*argv)) == NULL &&
341 (fs = getfsspec(*argv)) == NULL)
342 errx(1, "%s: unknown special file or file system",
344 if (BADTYPE(fs->fs_type))
345 errx(1, "%s has unknown file system type",
347 rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
348 init_flags, options, fs->fs_mntops);
352 * If -t flag has not been specified, the path cannot be
353 * found, spec contains either a ':' or a '@', then assume
354 * that an NFS file system is being specified ala Sun.
355 * Check if the hostname contains only allowed characters
356 * to reduce false positives. IPv6 addresses containing
357 * ':' will be correctly parsed only if the separator is '@'.
358 * The definition of a valid hostname is taken from RFC 1034.
360 if (vfslist == NULL && ((ep = strchr(argv[0], '@')) != NULL ||
361 (ep = strchr(argv[0], ':')) != NULL)) {
364 ep = cp + strlen(cp);
368 if (!isdigit(*cp) && !isalpha(*cp) &&
369 *cp != '.' && *cp != '-' && *cp != ':')
376 rval = mountfs(vfstype,
377 argv[0], argv[1], init_flags, options, NULL);
385 * If the mount was successfully, and done by root, tell mountd the
386 * good news. Pid checks are probably unnecessary, but don't hurt.
388 if (rval == 0 && getuid() == 0 &&
389 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
390 if (fscanf(mountdfp, "%d", &pid) == 1 &&
391 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
392 err(1, "signal mountd");
393 (void)fclose(mountdfp);
400 ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
402 char realfsfile[PATH_MAX];
405 if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
406 /* the root file system can always be remounted */
409 /* The user may have specified a symlink in fstab, resolve the path */
410 if (realpath(fs->fs_file, realfsfile) == NULL) {
411 /* Cannot resolve the path, use original one */
412 strlcpy(realfsfile, fs->fs_file, sizeof(realfsfile));
415 for (i = mntsize - 1; i >= 0; --i)
416 if (strcmp(realfsfile, mntbuf[i].f_mntonname) == 0 &&
417 (!isremountable(fs->fs_vfstype) ||
418 strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
424 isremountable(const char *vfsname)
428 for (cp = remountable_fs_names; *cp; cp++)
429 if (strcmp(*cp, vfsname) == 0)
435 hasopt(const char *mntopts, const char *option)
440 if (option[0] == 'n' && option[1] == 'o') {
445 optbuf = strdup(mntopts);
447 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
448 if (opt[0] == 'n' && opt[1] == 'o') {
449 if (!strcasecmp(opt + 2, option))
451 } else if (!strcasecmp(opt, option))
459 mountfs(const char *vfstype, const char *spec, const char *name, int flags,
460 const char *options, const char *mntopts)
465 char *optbuf, execname[PATH_MAX], mntpath[PATH_MAX];
467 /* resolve the mountpoint with realpath(3) */
468 (void)checkpath(name, mntpath);
473 optbuf = catopt(strdup(mntopts), options);
475 if (strcmp(name, "/") == 0)
477 if (flags & MNT_FORCE)
478 optbuf = catopt(optbuf, "force");
479 if (flags & MNT_RDONLY)
480 optbuf = catopt(optbuf, "ro");
483 * The mount_mfs (newfs) command uses -o to select the
484 * optimization mode. We don't pass the default "-o rw"
487 if (flags & MNT_UPDATE)
488 optbuf = catopt(optbuf, "update");
490 /* Compatibility glue. */
491 if (strcmp(vfstype, "msdos") == 0)
494 /* Construct the name of the appropriate mount command */
495 (void)snprintf(execname, sizeof(execname), "mount_%s", vfstype);
498 argv[argc++] = execname;
499 mangle(optbuf, &argc, argv);
500 argv[argc++] = strdup(spec);
501 argv[argc++] = strdup(name);
505 (void)printf("exec: mount_%s", vfstype);
506 for (i = 1; i < argc; i++)
507 (void)printf(" %s", argv[i]);
512 if (use_mountprog(vfstype)) {
513 ret = exec_mountprog(name, execname, argv);
515 ret = mount_fs(vfstype, argc, argv);
521 if (statfs(name, &sf) < 0) {
522 warn("statfs %s", name);
535 prmount(struct statfs *sfp)
542 (void)printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
545 flags = sfp->f_flags & MNT_VISFLAGMASK;
546 for (o = optnames; flags && o->o_opt; o++)
547 if (flags & o->o_opt) {
548 (void)printf(", %s", o->o_name);
552 * Inform when file system is mounted by an unprivileged user
553 * or privileged non-root user.
555 if ((flags & MNT_USER) != 0 || sfp->f_owner != 0) {
556 (void)printf(", mounted by ");
557 if ((pw = getpwuid(sfp->f_owner)) != NULL)
558 (void)printf("%s", pw->pw_name);
560 (void)printf("%d", sfp->f_owner);
563 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
564 (void)printf(", writes: sync %ju async %ju",
565 (uintmax_t)sfp->f_syncwrites,
566 (uintmax_t)sfp->f_asyncwrites);
567 if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
568 (void)printf(", reads: sync %ju async %ju",
569 (uintmax_t)sfp->f_syncreads,
570 (uintmax_t)sfp->f_asyncreads);
571 if (sfp->f_fsid.val[0] != 0 || sfp->f_fsid.val[1] != 0) {
573 for (i = 0; i < sizeof(sfp->f_fsid); i++)
574 printf("%02x", ((u_char *)&sfp->f_fsid)[i]);
581 getmntpt(const char *name)
583 struct statfs *mntbuf;
586 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
587 for (i = mntsize - 1; i >= 0; i--) {
588 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
589 strcmp(mntbuf[i].f_mntonname, name) == 0)
596 catopt(char *s0, const char *s1)
601 if (s1 == NULL || *s1 == '\0')
605 i = strlen(s0) + strlen(s1) + 1 + 1;
606 if ((cp = malloc(i)) == NULL)
607 errx(1, "malloc failed");
608 (void)snprintf(cp, i, "%s,%s", s0, s1);
618 mangle(options, argcp, argv)
627 for (s = options; (p = strsep(&s, ",")) != NULL;)
629 if (strcmp(p, "noauto") == 0) {
631 * Do not pass noauto option to nmount().
632 * or external mount program. noauto is
633 * only used to prevent mounting a filesystem
634 * when 'mount -a' is specified, and is
635 * not a real mount option.
638 } else if (strcmp(p, "userquota") == 0) {
640 } else if (strncmp(p, userquotaeq,
641 sizeof(userquotaeq) - 1) == 0) {
643 } else if (strcmp(p, "groupquota") == 0) {
645 } else if (strncmp(p, groupquotaeq,
646 sizeof(groupquotaeq) - 1) == 0) {
648 } else if (*p == '-') {
656 argv[argc++] = strdup("-o");
666 update_options(opts, fstab, curflags)
673 char *expopt, *newopt, *tmpopt;
678 /* remove meta options from list */
679 remopt(fstab, MOUNT_META_OPTION_FSTAB);
680 remopt(fstab, MOUNT_META_OPTION_CURRENT);
681 cur = flags2opts(curflags);
684 * Expand all meta-options passed to us first.
687 for (p = opts; (o = strsep(&p, ",")) != NULL;) {
688 if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
689 expopt = catopt(expopt, fstab);
690 else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
691 expopt = catopt(expopt, cur);
693 expopt = catopt(expopt, o);
699 * Remove previous contradictory arguments. Given option "foo" we
700 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
701 * and "foo" - so we can deal with possible options like "notice".
704 for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
705 if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
706 errx(1, "malloc failed");
708 strcpy(tmpopt, "no");
710 remopt(newopt, tmpopt);
713 if (strncmp("no", o, 2) == 0)
716 newopt = catopt(newopt, o);
730 if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
735 for (p = string; (o = strsep(&p, ",")) != NULL;) {
736 if (strcmp(opt, o) != 0) {
737 if (*r == ',' && *o != '\0')
739 while ((*r++ = *o++) != '\0')
751 (void)fprintf(stderr, "%s\n%s\n%s\n",
752 "usage: mount [-adfpruvw] [-F fstab] [-o options] [-t ufs | external_type]",
753 " mount [-dfpruvw] special | node",
754 " mount [-dfpruvw] [-o options] [-t ufs | external_type] special node");
760 const struct statfs *ent;
765 opts = flags2opts(ent->f_flags);
768 * "rw" is not a real mount option; this is why we print NULL as "rw"
769 * if opts is still NULL here.
771 printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
772 ent->f_fstypename, opts ? opts : "rw");
775 if ((fst = getfsspec(ent->f_mntfromname)))
776 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
777 else if ((fst = getfsfile(ent->f_mntonname)))
778 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
779 else if (strcmp(ent->f_fstypename, "ufs") == 0) {
780 if (strcmp(ent->f_mntonname, "/") == 0)
797 if (flags & MNT_RDONLY) res = catopt(res, "ro");
798 if (flags & MNT_SYNCHRONOUS) res = catopt(res, "sync");
799 if (flags & MNT_NOEXEC) res = catopt(res, "noexec");
800 if (flags & MNT_NOSUID) res = catopt(res, "nosuid");
801 if (flags & MNT_UNION) res = catopt(res, "union");
802 if (flags & MNT_ASYNC) res = catopt(res, "async");
803 if (flags & MNT_NOATIME) res = catopt(res, "noatime");
804 if (flags & MNT_NOCLUSTERR) res = catopt(res, "noclusterr");
805 if (flags & MNT_NOCLUSTERW) res = catopt(res, "noclusterw");
806 if (flags & MNT_NOSYMFOLLOW) res = catopt(res, "nosymfollow");
807 if (flags & MNT_SUIDDIR) res = catopt(res, "suiddir");
808 if (flags & MNT_MULTILABEL) res = catopt(res, "multilabel");
809 if (flags & MNT_ACLS) res = catopt(res, "acls");