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
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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, char *const argv[])
155 switch (pid = fork()) {
156 case -1: /* Error. */
160 /* Go find an executable. */
161 execvP(execname, _PATH_SYSPATH, argv);
162 if (errno == ENOENT) {
163 warn("exec %s not found in %s", execname,
167 default: /* Parent. */
168 if (waitpid(pid, &status, 0) < 0) {
173 if (WIFEXITED(status)) {
174 if (WEXITSTATUS(status) != 0)
175 return (WEXITSTATUS(status));
176 } else if (WIFSIGNALED(status)) {
177 warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
187 main(int argc, char *argv[])
189 const char *mntfromname, **vfslist, *vfstype;
191 struct statfs *mntbuf;
194 int all, ch, i, init_flags, late, mntsize, rval, have_fstab;
195 char *cp, *ep, *options;
197 options = strdup("noro");
199 errx(1, "malloc failed");
201 all = init_flags = late = 0;
204 while ((ch = getopt(argc, argv, "adlF:fo:prwt:uv")) != -1)
216 init_flags |= MNT_FORCE;
222 options = catopt(options, optarg);
229 options = catopt(options, "ro");
233 errx(1, "only one -t option may be specified");
234 vfslist = makevfslist(optarg);
238 init_flags |= MNT_UPDATE;
244 options = catopt(options, "noro");
254 #define BADTYPE(type) \
255 (strcmp(type, FSTAB_RO) && \
256 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
261 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
262 err(1, "getmntinfo");
264 while ((fs = getfsent()) != NULL) {
265 if (BADTYPE(fs->fs_type))
267 if (checkvfsname(fs->fs_vfstype, vfslist))
269 if (hasopt(fs->fs_mntops, "noauto"))
271 if (hasopt(fs->fs_mntops, "late") && !late)
273 if (!(init_flags & MNT_UPDATE) &&
274 ismounted(fs, mntbuf, mntsize))
276 options = update_options(options, fs->fs_mntops,
278 if (mountfs(fs->fs_vfstype, fs->fs_spec,
279 fs->fs_file, init_flags, options,
283 } else if (fstab_style) {
284 for (i = 0; i < mntsize; i++) {
285 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
287 putfsent(&mntbuf[i]);
290 for (i = 0; i < mntsize; i++) {
291 if (checkvfsname(mntbuf[i].f_fstypename,
302 rmslashes(*argv, *argv);
303 if (init_flags & MNT_UPDATE) {
306 if ((mntbuf = getmntpt(*argv)) == NULL)
307 errx(1, "not currently mounted %s", *argv);
309 * Only get the mntflags from fstab if both mntpoint
310 * and mntspec are identical. Also handle the special
311 * case where just '/' is mounted and 'spec' is not
312 * identical with the one from fstab ('/dev' is missing
313 * in the spec-string at boot-time).
315 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
316 if (strcmp(fs->fs_spec,
317 mntbuf->f_mntfromname) == 0 &&
319 mntbuf->f_mntonname) == 0) {
321 mntfromname = mntbuf->f_mntfromname;
322 } else if (argv[0][0] == '/' &&
323 argv[0][1] == '\0') {
326 mntfromname = fs->fs_spec;
330 options = update_options(options, fs->fs_mntops,
333 mntfromname = mntbuf->f_mntfromname;
334 options = update_options(options, NULL,
337 rval = mountfs(mntbuf->f_fstypename, mntfromname,
338 mntbuf->f_mntonname, init_flags, options, 0);
341 if ((fs = getfsfile(*argv)) == NULL &&
342 (fs = getfsspec(*argv)) == NULL)
343 errx(1, "%s: unknown special file or file system",
345 if (BADTYPE(fs->fs_type))
346 errx(1, "%s has unknown file system type",
348 rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
349 init_flags, options, fs->fs_mntops);
353 * If -t flag has not been specified, the path cannot be
354 * found, spec contains either a ':' or a '@', then assume
355 * that an NFS file system is being specified ala Sun.
356 * Check if the hostname contains only allowed characters
357 * to reduce false positives. IPv6 addresses containing
358 * ':' will be correctly parsed only if the separator is '@'.
359 * The definition of a valid hostname is taken from RFC 1034.
361 if (vfslist == NULL && ((ep = strchr(argv[0], '@')) != NULL ||
362 (ep = strchr(argv[0], ':')) != NULL)) {
365 ep = cp + strlen(cp);
369 if (!isdigit(*cp) && !isalpha(*cp) &&
370 *cp != '.' && *cp != '-' && *cp != ':')
377 rval = mountfs(vfstype,
378 argv[0], argv[1], init_flags, options, NULL);
386 * If the mount was successfully, and done by root, tell mountd the
387 * good news. Pid checks are probably unnecessary, but don't hurt.
389 if (rval == 0 && getuid() == 0 &&
390 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
391 if (fscanf(mountdfp, "%d", &pid) == 1 &&
392 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
393 err(1, "signal mountd");
394 (void)fclose(mountdfp);
401 ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
403 char realfsfile[PATH_MAX];
406 if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
407 /* the root file system can always be remounted */
410 /* The user may have specified a symlink in fstab, resolve the path */
411 if (realpath(fs->fs_file, realfsfile) == NULL) {
412 /* Cannot resolve the path, use original one */
413 strlcpy(realfsfile, fs->fs_file, sizeof(realfsfile));
416 for (i = mntsize - 1; i >= 0; --i)
417 if (strcmp(realfsfile, mntbuf[i].f_mntonname) == 0 &&
418 (!isremountable(fs->fs_vfstype) ||
419 strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
425 isremountable(const char *vfsname)
429 for (cp = remountable_fs_names; *cp; cp++)
430 if (strcmp(*cp, vfsname) == 0)
436 hasopt(const char *mntopts, const char *option)
441 if (option[0] == 'n' && option[1] == 'o') {
446 optbuf = strdup(mntopts);
448 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
449 if (opt[0] == 'n' && opt[1] == 'o') {
450 if (!strcasecmp(opt + 2, option))
452 } else if (!strcasecmp(opt, option))
460 mountfs(const char *vfstype, const char *spec, const char *name, int flags,
461 const char *options, const char *mntopts)
466 char *optbuf, execname[PATH_MAX], mntpath[PATH_MAX];
468 /* resolve the mountpoint with realpath(3) */
469 (void)checkpath(name, mntpath);
474 optbuf = catopt(strdup(mntopts), options);
476 if (strcmp(name, "/") == 0)
478 if (flags & MNT_FORCE)
479 optbuf = catopt(optbuf, "force");
480 if (flags & MNT_RDONLY)
481 optbuf = catopt(optbuf, "ro");
484 * The mount_mfs (newfs) command uses -o to select the
485 * optimization mode. We don't pass the default "-o rw"
488 if (flags & MNT_UPDATE)
489 optbuf = catopt(optbuf, "update");
491 /* Compatibility glue. */
492 if (strcmp(vfstype, "msdos") == 0)
495 /* Construct the name of the appropriate mount command */
496 (void)snprintf(execname, sizeof(execname), "mount_%s", vfstype);
499 argv[argc++] = execname;
500 mangle(optbuf, &argc, argv);
501 argv[argc++] = strdup(spec);
502 argv[argc++] = strdup(name);
506 (void)printf("exec: mount_%s", vfstype);
507 for (i = 1; i < argc; i++)
508 (void)printf(" %s", argv[i]);
513 if (use_mountprog(vfstype)) {
514 ret = exec_mountprog(name, execname, argv);
516 ret = mount_fs(vfstype, argc, argv);
522 if (statfs(name, &sf) < 0) {
523 warn("statfs %s", name);
536 prmount(struct statfs *sfp)
543 (void)printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
546 flags = sfp->f_flags & MNT_VISFLAGMASK;
547 for (o = optnames; flags && o->o_opt; o++)
548 if (flags & o->o_opt) {
549 (void)printf(", %s", o->o_name);
553 * Inform when file system is mounted by an unprivileged user
554 * or privileged non-root user.
556 if ((flags & MNT_USER) != 0 || sfp->f_owner != 0) {
557 (void)printf(", mounted by ");
558 if ((pw = getpwuid(sfp->f_owner)) != NULL)
559 (void)printf("%s", pw->pw_name);
561 (void)printf("%d", sfp->f_owner);
564 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
565 (void)printf(", writes: sync %ju async %ju",
566 (uintmax_t)sfp->f_syncwrites,
567 (uintmax_t)sfp->f_asyncwrites);
568 if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
569 (void)printf(", reads: sync %ju async %ju",
570 (uintmax_t)sfp->f_syncreads,
571 (uintmax_t)sfp->f_asyncreads);
572 if (sfp->f_fsid.val[0] != 0 || sfp->f_fsid.val[1] != 0) {
574 for (i = 0; i < sizeof(sfp->f_fsid); i++)
575 printf("%02x", ((u_char *)&sfp->f_fsid)[i]);
582 getmntpt(const char *name)
584 struct statfs *mntbuf;
587 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
588 for (i = mntsize - 1; i >= 0; i--) {
589 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
590 strcmp(mntbuf[i].f_mntonname, name) == 0)
597 catopt(char *s0, const char *s1)
602 if (s1 == NULL || *s1 == '\0')
606 i = strlen(s0) + strlen(s1) + 1 + 1;
607 if ((cp = malloc(i)) == NULL)
608 errx(1, "malloc failed");
609 (void)snprintf(cp, i, "%s,%s", s0, s1);
619 mangle(char *options, int *argcp, char *argv[])
625 for (s = options; (p = strsep(&s, ",")) != NULL;)
627 if (strcmp(p, "noauto") == 0) {
629 * Do not pass noauto option to nmount().
630 * or external mount program. noauto is
631 * only used to prevent mounting a filesystem
632 * when 'mount -a' is specified, and is
633 * not a real mount option.
636 } else if (strcmp(p, "late") == 0) {
638 * "late" is used to prevent certain file
639 * systems from being mounted before late
640 * in the boot cycle; for instance,
641 * loopback NFS mounts can't be mounted
642 * before mountd starts.
645 } else if (strcmp(p, "userquota") == 0) {
647 } else if (strncmp(p, userquotaeq,
648 sizeof(userquotaeq) - 1) == 0) {
650 } else if (strcmp(p, "groupquota") == 0) {
652 } else if (strncmp(p, groupquotaeq,
653 sizeof(groupquotaeq) - 1) == 0) {
655 } else if (*p == '-') {
663 argv[argc++] = strdup("-o");
673 update_options(char *opts, char *fstab, int curflags)
677 char *expopt, *newopt, *tmpopt;
682 /* remove meta options from list */
683 remopt(fstab, MOUNT_META_OPTION_FSTAB);
684 remopt(fstab, MOUNT_META_OPTION_CURRENT);
685 cur = flags2opts(curflags);
688 * Expand all meta-options passed to us first.
691 for (p = opts; (o = strsep(&p, ",")) != NULL;) {
692 if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
693 expopt = catopt(expopt, fstab);
694 else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
695 expopt = catopt(expopt, cur);
697 expopt = catopt(expopt, o);
703 * Remove previous contradictory arguments. Given option "foo" we
704 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
705 * and "foo" - so we can deal with possible options like "notice".
708 for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
709 if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
710 errx(1, "malloc failed");
712 strcpy(tmpopt, "no");
714 remopt(newopt, tmpopt);
717 if (strncmp("no", o, 2) == 0)
720 newopt = catopt(newopt, o);
728 remopt(char *string, const char *opt)
732 if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
737 for (p = string; (o = strsep(&p, ",")) != NULL;) {
738 if (strcmp(opt, o) != 0) {
739 if (*r == ',' && *o != '\0')
741 while ((*r++ = *o++) != '\0')
753 (void)fprintf(stderr, "%s\n%s\n%s\n",
754 "usage: mount [-adflpruvw] [-F fstab] [-o options] [-t ufs | external_type]",
755 " mount [-dfpruvw] special | node",
756 " mount [-dfpruvw] [-o options] [-t ufs | external_type] special node");
761 putfsent(const struct statfs *ent)
766 opts = flags2opts(ent->f_flags);
769 * "rw" is not a real mount option; this is why we print NULL as "rw"
770 * if opts is still NULL here.
772 printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
773 ent->f_fstypename, opts ? opts : "rw");
776 if ((fst = getfsspec(ent->f_mntfromname)))
777 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
778 else if ((fst = getfsfile(ent->f_mntonname)))
779 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
780 else if (strcmp(ent->f_fstypename, "ufs") == 0) {
781 if (strcmp(ent->f_mntonname, "/") == 0)
791 flags2opts(int flags)
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");