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";
35 static char sccsid[] = "@(#)mount.c 8.25 (Berkeley) 5/8/95";
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
42 #include <sys/param.h>
43 #include <sys/mount.h>
63 #include "pathnames.h"
66 #define MOUNT_META_OPTION_FSTAB "fstab"
67 #define MOUNT_META_OPTION_CURRENT "current"
69 static int debug, fstab_style, verbose;
77 char *catopt(char *, const char *);
78 struct statfs *getmntpt(const char *);
79 int hasopt(const char *, const char *);
80 int ismounted(struct fstab *, struct statfs *, int);
81 int isremountable(const char *);
82 void mangle(char *, struct cpa *);
83 char *update_options(char *, char *, int);
84 int mountfs(const char *, const char *, const char *,
85 int, const char *, const char *);
86 void remopt(char *, const char *);
87 void prmount(struct statfs *);
88 void putfsent(struct statfs *);
90 char *flags2opts(int);
92 /* Map from mount options to printable formats. */
97 { MNT_ASYNC, "asynchronous" },
98 { MNT_EXPORTED, "NFS exported" },
99 { MNT_LOCAL, "local" },
100 { MNT_NOATIME, "noatime" },
101 { MNT_NOEXEC, "noexec" },
102 { MNT_NOSUID, "nosuid" },
103 { MNT_NOSYMFOLLOW, "nosymfollow" },
104 { MNT_QUOTA, "with quotas" },
105 { MNT_RDONLY, "read-only" },
106 { MNT_SYNCHRONOUS, "synchronous" },
107 { MNT_UNION, "union" },
108 { MNT_NOCLUSTERR, "noclusterr" },
109 { MNT_NOCLUSTERW, "noclusterw" },
110 { MNT_SUIDDIR, "suiddir" },
111 { MNT_SOFTDEP, "soft-updates" },
112 { MNT_SUJ, "journaled soft-updates" },
113 { MNT_MULTILABEL, "multilabel" },
114 { MNT_ACLS, "acls" },
115 { MNT_NFS4ACLS, "nfsv4acls" },
116 { MNT_GJOURNAL, "gjournal" },
117 { MNT_AUTOMOUNTED, "automounted" },
122 * List of VFS types that can be remounted without becoming mounted on top
124 * XXX Is this list correct?
127 remountable_fs_names[] = {
128 "ufs", "ffs", "ext2fs",
132 static const char userquotaeq[] = "userquota=";
133 static const char groupquotaeq[] = "groupquota=";
135 static char *mountprog = NULL;
138 use_mountprog(const char *vfstype)
140 /* XXX: We need to get away from implementing external mount
141 * programs for every filesystem, and move towards having
142 * each filesystem properly implement the nmount() system call.
146 "cd9660", "mfs", "msdosfs", "nfs",
147 "nullfs", "smbfs", "udf", "unionfs",
151 if (mountprog != NULL)
154 for (i = 0; fs[i] != NULL; ++i) {
155 if (strcmp(vfstype, fs[i]) == 0)
163 exec_mountprog(const char *name, const char *execname, char *const argv[])
168 switch (pid = fork()) {
169 case -1: /* Error. */
173 /* Go find an executable. */
174 execvP(execname, _PATH_SYSPATH, argv);
175 if (errno == ENOENT) {
176 warn("exec %s not found", execname);
177 if (execname[0] != '/') {
178 warnx("in path: %s", _PATH_SYSPATH);
182 default: /* Parent. */
183 if (waitpid(pid, &status, 0) < 0) {
188 if (WIFEXITED(status)) {
189 if (WEXITSTATUS(status) != 0)
190 return (WEXITSTATUS(status));
191 } else if (WIFSIGNALED(status)) {
192 warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
202 specified_ro(const char *arg)
207 optbuf = strdup(arg);
211 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
212 if (strcmp(opt, "ro") == 0) {
228 pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &mountdpid);
230 /* Mountd is not running. */
234 if (errno != EEXIST) {
235 /* Cannot open pidfile for some reason. */
240 * Refuse to send broadcast or group signals, this has
241 * happened due to the bugs in pidfile(3).
243 if (mountdpid <= 0) {
244 warnx("mountd pid %d, refusing to send SIGHUP", mountdpid);
248 /* We have mountd(8) PID in mountdpid varible, let's signal it. */
249 if (kill(mountdpid, SIGHUP) == -1)
250 err(1, "signal mountd");
254 main(int argc, char *argv[])
256 const char *mntfromname, **vfslist, *vfstype;
258 struct statfs *mntbuf;
259 int all, ch, i, init_flags, late, failok, mntsize, rval, have_fstab, ro;
261 char *cp, *ep, *options;
263 all = init_flags = late = onlylate = 0;
268 while ((ch = getopt(argc, argv, "adF:fLlno:prt:uvw")) != -1)
280 init_flags |= MNT_FORCE;
290 /* For compatibility with the Linux version of mount. */
294 options = catopt(options, optarg);
295 if (specified_ro(optarg))
304 options = catopt(options, "ro");
309 errx(1, "only one -t option may be specified");
310 vfslist = makevfslist(optarg);
314 init_flags |= MNT_UPDATE;
320 options = catopt(options, "noro");
330 #define BADTYPE(type) \
331 (strcmp(type, FSTAB_RO) && \
332 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
334 if ((init_flags & MNT_UPDATE) && (ro == 0))
335 options = catopt(options, "noro");
340 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
341 err(1, "getmntinfo");
343 while ((fs = getfsent()) != NULL) {
344 if (BADTYPE(fs->fs_type))
346 if (checkvfsname(fs->fs_vfstype, vfslist))
348 if (hasopt(fs->fs_mntops, "noauto"))
350 if (!hasopt(fs->fs_mntops, "late") && onlylate)
352 if (hasopt(fs->fs_mntops, "late") && !late)
354 if (hasopt(fs->fs_mntops, "failok"))
358 if (!(init_flags & MNT_UPDATE) &&
359 ismounted(fs, mntbuf, mntsize))
361 options = update_options(options, fs->fs_mntops,
363 if (mountfs(fs->fs_vfstype, fs->fs_spec,
364 fs->fs_file, init_flags, options,
365 fs->fs_mntops) && !failok)
368 } else if (fstab_style) {
369 for (i = 0; i < mntsize; i++) {
370 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
372 putfsent(&mntbuf[i]);
375 for (i = 0; i < mntsize; i++) {
376 if (checkvfsname(mntbuf[i].f_fstypename,
380 (mntbuf[i].f_flags & MNT_IGNORE) != 0)
390 rmslashes(*argv, *argv);
391 if (init_flags & MNT_UPDATE) {
394 if ((mntbuf = getmntpt(*argv)) == NULL)
395 errx(1, "not currently mounted %s", *argv);
397 * Only get the mntflags from fstab if both mntpoint
398 * and mntspec are identical. Also handle the special
399 * case where just '/' is mounted and 'spec' is not
400 * identical with the one from fstab ('/dev' is missing
401 * in the spec-string at boot-time).
403 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
404 if (strcmp(fs->fs_spec,
405 mntbuf->f_mntfromname) == 0 &&
407 mntbuf->f_mntonname) == 0) {
409 mntfromname = mntbuf->f_mntfromname;
410 } else if (argv[0][0] == '/' &&
411 argv[0][1] == '\0' &&
412 strcmp(fs->fs_vfstype,
413 mntbuf->f_fstypename) == 0) {
416 mntfromname = fs->fs_spec;
420 options = update_options(options, fs->fs_mntops,
423 mntfromname = mntbuf->f_mntfromname;
424 options = update_options(options, NULL,
427 rval = mountfs(mntbuf->f_fstypename, mntfromname,
428 mntbuf->f_mntonname, init_flags, options, 0);
431 if ((fs = getfsfile(*argv)) == NULL &&
432 (fs = getfsspec(*argv)) == NULL)
433 errx(1, "%s: unknown special file or file system",
435 if (BADTYPE(fs->fs_type))
436 errx(1, "%s has unknown file system type",
438 rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
439 init_flags, options, fs->fs_mntops);
443 * If -t flag has not been specified, the path cannot be
444 * found, spec contains either a ':' or a '@', then assume
445 * that an NFS file system is being specified ala Sun.
446 * Check if the hostname contains only allowed characters
447 * to reduce false positives. IPv6 addresses containing
448 * ':' will be correctly parsed only if the separator is '@'.
449 * The definition of a valid hostname is taken from RFC 1034.
451 if (vfslist == NULL && ((ep = strchr(argv[0], '@')) != NULL ||
452 (ep = strchr(argv[0], ':')) != NULL)) {
455 ep = cp + strlen(cp);
459 if (!isdigit(*cp) && !isalpha(*cp) &&
460 *cp != '.' && *cp != '-' && *cp != ':')
467 rval = mountfs(vfstype,
468 argv[0], argv[1], init_flags, options, NULL);
476 * If the mount was successfully, and done by root, tell mountd the
479 if (rval == 0 && getuid() == 0)
486 ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
488 char realfsfile[PATH_MAX];
491 if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
492 /* the root file system can always be remounted */
495 /* The user may have specified a symlink in fstab, resolve the path */
496 if (realpath(fs->fs_file, realfsfile) == NULL) {
497 /* Cannot resolve the path, use original one */
498 strlcpy(realfsfile, fs->fs_file, sizeof(realfsfile));
502 * Consider the filesystem to be mounted if:
503 * It has the same mountpoint as a mounted filesytem, and
504 * It has the same type as that same mounted filesystem, and
505 * It has the same device name as that same mounted filesystem, OR
506 * It is a nonremountable filesystem
508 for (i = mntsize - 1; i >= 0; --i)
509 if (strcmp(realfsfile, mntbuf[i].f_mntonname) == 0 &&
510 strcmp(fs->fs_vfstype, mntbuf[i].f_fstypename) == 0 &&
511 (!isremountable(fs->fs_vfstype) ||
512 (strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0)))
518 isremountable(const char *vfsname)
522 for (cp = remountable_fs_names; *cp; cp++)
523 if (strcmp(*cp, vfsname) == 0)
529 hasopt(const char *mntopts, const char *option)
534 if (option[0] == 'n' && option[1] == 'o') {
539 optbuf = strdup(mntopts);
541 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
542 if (opt[0] == 'n' && opt[1] == 'o') {
543 if (!strcasecmp(opt + 2, option))
545 } else if (!strcasecmp(opt, option))
553 append_arg(struct cpa *sa, char *arg)
555 if (sa->c + 1 == sa->sz) {
556 sa->sz = sa->sz == 0 ? 8 : sa->sz * 2;
557 sa->a = realloc(sa->a, sizeof(*sa->a) * sa->sz);
559 errx(1, "realloc failed");
561 sa->a[++sa->c] = arg;
565 mountfs(const char *vfstype, const char *spec, const char *name, int flags,
566 const char *options, const char *mntopts)
570 char *optbuf, execname[PATH_MAX], mntpath[PATH_MAX];
571 static struct cpa mnt_argv;
573 /* resolve the mountpoint with realpath(3) */
574 if (checkpath(name, mntpath) != 0) {
582 optbuf = catopt(strdup(mntopts), options);
584 if (strcmp(name, "/") == 0)
586 if (flags & MNT_FORCE)
587 optbuf = catopt(optbuf, "force");
588 if (flags & MNT_RDONLY)
589 optbuf = catopt(optbuf, "ro");
592 * The mount_mfs (newfs) command uses -o to select the
593 * optimization mode. We don't pass the default "-o rw"
596 if (flags & MNT_UPDATE)
597 optbuf = catopt(optbuf, "update");
599 /* Compatibility glue. */
600 if (strcmp(vfstype, "msdos") == 0) {
602 "Using \"-t msdosfs\", since \"-t msdos\" is deprecated.");
606 /* Construct the name of the appropriate mount command */
607 (void)snprintf(execname, sizeof(execname), "mount_%s", vfstype);
610 append_arg(&mnt_argv, execname);
611 mangle(optbuf, &mnt_argv);
612 if (mountprog != NULL)
613 strlcpy(execname, mountprog, sizeof(execname));
615 append_arg(&mnt_argv, strdup(spec));
616 append_arg(&mnt_argv, strdup(name));
617 append_arg(&mnt_argv, NULL);
620 if (use_mountprog(vfstype))
621 printf("exec: %s", execname);
623 printf("mount -t %s", vfstype);
624 for (i = 1; i < mnt_argv.c; i++)
625 (void)printf(" %s", mnt_argv.a[i]);
633 if (use_mountprog(vfstype)) {
634 ret = exec_mountprog(name, execname, mnt_argv.a);
636 ret = mount_fs(vfstype, mnt_argv.c, mnt_argv.a);
644 if (statfs(name, &sf) < 0) {
645 warn("statfs %s", name);
658 prmount(struct statfs *sfp)
665 (void)printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
668 flags = sfp->f_flags & MNT_VISFLAGMASK;
669 for (o = optnames; flags != 0 && o->o_opt != 0; o++)
670 if (flags & o->o_opt) {
671 (void)printf(", %s", o->o_name);
675 * Inform when file system is mounted by an unprivileged user
676 * or privileged non-root user.
678 if ((flags & MNT_USER) != 0 || sfp->f_owner != 0) {
679 (void)printf(", mounted by ");
680 if ((pw = getpwuid(sfp->f_owner)) != NULL)
681 (void)printf("%s", pw->pw_name);
683 (void)printf("%d", sfp->f_owner);
686 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
687 (void)printf(", writes: sync %ju async %ju",
688 (uintmax_t)sfp->f_syncwrites,
689 (uintmax_t)sfp->f_asyncwrites);
690 if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
691 (void)printf(", reads: sync %ju async %ju",
692 (uintmax_t)sfp->f_syncreads,
693 (uintmax_t)sfp->f_asyncreads);
694 if (sfp->f_fsid.val[0] != 0 || sfp->f_fsid.val[1] != 0) {
696 for (i = 0; i < sizeof(sfp->f_fsid); i++)
697 printf("%02x", ((u_char *)&sfp->f_fsid)[i]);
704 getmntpt(const char *name)
706 struct statfs *mntbuf;
709 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
710 for (i = mntsize - 1; i >= 0; i--) {
711 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
712 strcmp(mntbuf[i].f_mntonname, name) == 0)
719 catopt(char *s0, const char *s1)
724 if (s1 == NULL || *s1 == '\0')
728 i = strlen(s0) + strlen(s1) + 1 + 1;
729 if ((cp = malloc(i)) == NULL)
730 errx(1, "malloc failed");
731 (void)snprintf(cp, i, "%s,%s", s0, s1);
741 mangle(char *options, struct cpa *a)
745 for (s = options; (p = strsep(&s, ",")) != NULL;)
747 if (strcmp(p, "noauto") == 0) {
749 * Do not pass noauto option to nmount().
750 * or external mount program. noauto is
751 * only used to prevent mounting a filesystem
752 * when 'mount -a' is specified, and is
753 * not a real mount option.
756 } else if (strcmp(p, "late") == 0) {
758 * "late" is used to prevent certain file
759 * systems from being mounted before late
760 * in the boot cycle; for instance,
761 * loopback NFS mounts can't be mounted
762 * before mountd starts.
765 } else if (strcmp(p, "failok") == 0) {
767 * "failok" is used to prevent certain file
768 * systems from being causing the system to
769 * drop into single user mode in the boot
770 * cycle, and is not a real mount option.
773 } else if (strncmp(p, "mountprog", 9) == 0) {
775 * "mountprog" is used to force the use of
776 * userland mount programs.
778 val = strchr(p, '=');
782 mountprog = strdup(val);
785 if (mountprog == NULL) {
786 errx(1, "Need value for -o mountprog");
789 } else if (strcmp(p, "userquota") == 0) {
791 } else if (strncmp(p, userquotaeq,
792 sizeof(userquotaeq) - 1) == 0) {
794 } else if (strcmp(p, "groupquota") == 0) {
796 } else if (strncmp(p, groupquotaeq,
797 sizeof(groupquotaeq) - 1) == 0) {
799 } else if (*p == '-') {
804 append_arg(a, p + 1);
807 append_arg(a, strdup("-o"));
815 update_options(char *opts, char *fstab, int curflags)
819 char *expopt, *newopt, *tmpopt;
824 /* remove meta options from list */
825 remopt(fstab, MOUNT_META_OPTION_FSTAB);
826 remopt(fstab, MOUNT_META_OPTION_CURRENT);
827 cur = flags2opts(curflags);
830 * Expand all meta-options passed to us first.
833 for (p = opts; (o = strsep(&p, ",")) != NULL;) {
834 if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
835 expopt = catopt(expopt, fstab);
836 else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
837 expopt = catopt(expopt, cur);
839 expopt = catopt(expopt, o);
845 * Remove previous contradictory arguments. Given option "foo" we
846 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
847 * and "foo" - so we can deal with possible options like "notice".
850 for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
851 if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
852 errx(1, "malloc failed");
854 strcpy(tmpopt, "no");
856 remopt(newopt, tmpopt);
859 if (strncmp("no", o, 2) == 0)
862 newopt = catopt(newopt, o);
870 remopt(char *string, const char *opt)
874 if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
879 for (p = string; (o = strsep(&p, ",")) != NULL;) {
880 if (strcmp(opt, o) != 0) {
881 if (*r == ',' && *o != '\0')
883 while ((*r++ = *o++) != '\0')
895 (void)fprintf(stderr, "%s\n%s\n%s\n",
896 "usage: mount [-adflpruvw] [-F fstab] [-o options] [-t ufs | external_type]",
897 " mount [-dfpruvw] special | node",
898 " mount [-dfpruvw] [-o options] [-t ufs | external_type] special node");
903 putfsent(struct statfs *ent)
910 /* flags2opts() doesn't return the "rw" option. */
911 if ((ent->f_flags & MNT_RDONLY) != 0)
914 rw = catopt(NULL, "rw");
916 opts = flags2opts(ent->f_flags);
917 opts = catopt(rw, opts);
919 if (strncmp(ent->f_mntfromname, "<below>", 7) == 0 ||
920 strncmp(ent->f_mntfromname, "<above>", 7) == 0) {
921 strlcpy(ent->f_mntfromname,
922 (strnstr(ent->f_mntfromname, ":", 8) +1),
923 sizeof(ent->f_mntfromname));
926 l = strlen(ent->f_mntfromname);
927 printf("%s%s%s%s", ent->f_mntfromname,
930 l < 24 ? "\t" : " ");
931 l = strlen(ent->f_mntonname);
932 printf("%s%s%s%s", ent->f_mntonname,
935 l < 24 ? "\t" : " ");
936 printf("%s\t", ent->f_fstypename);
942 if ((fst = getfsspec(ent->f_mntfromname)))
943 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
944 else if ((fst = getfsfile(ent->f_mntonname)))
945 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
946 else if (strcmp(ent->f_fstypename, "ufs") == 0) {
947 if (strcmp(ent->f_mntonname, "/") == 0)
957 flags2opts(int flags)
963 if (flags & MNT_RDONLY) res = catopt(res, "ro");
964 if (flags & MNT_SYNCHRONOUS) res = catopt(res, "sync");
965 if (flags & MNT_NOEXEC) res = catopt(res, "noexec");
966 if (flags & MNT_NOSUID) res = catopt(res, "nosuid");
967 if (flags & MNT_UNION) res = catopt(res, "union");
968 if (flags & MNT_ASYNC) res = catopt(res, "async");
969 if (flags & MNT_NOATIME) res = catopt(res, "noatime");
970 if (flags & MNT_NOCLUSTERR) res = catopt(res, "noclusterr");
971 if (flags & MNT_NOCLUSTERW) res = catopt(res, "noclusterw");
972 if (flags & MNT_NOSYMFOLLOW) res = catopt(res, "nosymfollow");
973 if (flags & MNT_SUIDDIR) res = catopt(res, "suiddir");
974 if (flags & MNT_MULTILABEL) res = catopt(res, "multilabel");
975 if (flags & MNT_ACLS) res = catopt(res, "acls");
976 if (flags & MNT_NFS4ACLS) res = catopt(res, "nfsv4acls");