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, 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, mntsize, rval, have_fstab;
195 char *cp, *ep, *options;
197 options = strdup("noro");
199 errx(1, "malloc failed");
201 all = init_flags = 0;
204 while ((ch = getopt(argc, argv, "adF:fo:prwt:uv")) != -1)
216 init_flags |= MNT_FORCE;
219 options = catopt(options, optarg);
226 options = catopt(options, "ro");
230 errx(1, "only one -t option may be specified");
231 vfslist = makevfslist(optarg);
235 init_flags |= MNT_UPDATE;
241 options = catopt(options, "noro");
251 #define BADTYPE(type) \
252 (strcmp(type, FSTAB_RO) && \
253 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
258 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
259 err(1, "getmntinfo");
261 while ((fs = getfsent()) != NULL) {
262 if (BADTYPE(fs->fs_type))
264 if (checkvfsname(fs->fs_vfstype, vfslist))
266 if (hasopt(fs->fs_mntops, "noauto"))
268 if (!(init_flags & MNT_UPDATE) &&
269 ismounted(fs, mntbuf, mntsize))
271 options = update_options(options, fs->fs_mntops,
273 if (mountfs(fs->fs_vfstype, fs->fs_spec,
274 fs->fs_file, init_flags, options,
278 } else if (fstab_style) {
279 for (i = 0; i < mntsize; i++) {
280 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
282 putfsent(&mntbuf[i]);
285 for (i = 0; i < mntsize; i++) {
286 if (checkvfsname(mntbuf[i].f_fstypename,
297 rmslashes(*argv, *argv);
298 if (init_flags & MNT_UPDATE) {
301 if ((mntbuf = getmntpt(*argv)) == NULL)
302 errx(1, "not currently mounted %s", *argv);
304 * Only get the mntflags from fstab if both mntpoint
305 * and mntspec are identical. Also handle the special
306 * case where just '/' is mounted and 'spec' is not
307 * identical with the one from fstab ('/dev' is missing
308 * in the spec-string at boot-time).
310 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
311 if (strcmp(fs->fs_spec,
312 mntbuf->f_mntfromname) == 0 &&
314 mntbuf->f_mntonname) == 0) {
316 mntfromname = mntbuf->f_mntfromname;
317 } else if (argv[0][0] == '/' &&
318 argv[0][1] == '\0') {
321 mntfromname = fs->fs_spec;
325 options = update_options(options, fs->fs_mntops,
328 mntfromname = mntbuf->f_mntfromname;
329 options = update_options(options, NULL,
332 rval = mountfs(mntbuf->f_fstypename, mntfromname,
333 mntbuf->f_mntonname, init_flags, options, 0);
336 if ((fs = getfsfile(*argv)) == NULL &&
337 (fs = getfsspec(*argv)) == NULL)
338 errx(1, "%s: unknown special file or file system",
340 if (BADTYPE(fs->fs_type))
341 errx(1, "%s has unknown file system type",
343 rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
344 init_flags, options, fs->fs_mntops);
348 * If -t flag has not been specified, the path cannot be
349 * found, spec contains either a ':' or a '@', then assume
350 * that an NFS file system is being specified ala Sun.
351 * Check if the hostname contains only allowed characters
352 * to reduce false positives. IPv6 addresses containing
353 * ':' will be correctly parsed only if the separator is '@'.
354 * The definition of a valid hostname is taken from RFC 1034.
356 if (vfslist == NULL && ((ep = strchr(argv[0], '@')) != NULL ||
357 (ep = strchr(argv[0], ':')) != NULL)) {
360 ep = cp + strlen(cp);
364 if (!isdigit(*cp) && !isalpha(*cp) &&
365 *cp != '.' && *cp != '-' && *cp != ':')
372 rval = mountfs(vfstype,
373 argv[0], argv[1], init_flags, options, NULL);
381 * If the mount was successfully, and done by root, tell mountd the
382 * good news. Pid checks are probably unnecessary, but don't hurt.
384 if (rval == 0 && getuid() == 0 &&
385 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
386 if (fscanf(mountdfp, "%d", &pid) == 1 &&
387 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
388 err(1, "signal mountd");
389 (void)fclose(mountdfp);
396 ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
398 char realfsfile[PATH_MAX];
401 if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
402 /* the root file system can always be remounted */
405 /* The user may have specified a symlink in fstab, resolve the path */
406 if (realpath(fs->fs_file, realfsfile) == NULL) {
407 /* Cannot resolve the path, use original one */
408 strlcpy(realfsfile, fs->fs_file, sizeof(realfsfile));
411 for (i = mntsize - 1; i >= 0; --i)
412 if (strcmp(realfsfile, mntbuf[i].f_mntonname) == 0 &&
413 (!isremountable(fs->fs_vfstype) ||
414 strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
420 isremountable(const char *vfsname)
424 for (cp = remountable_fs_names; *cp; cp++)
425 if (strcmp(*cp, vfsname) == 0)
431 hasopt(const char *mntopts, const char *option)
436 if (option[0] == 'n' && option[1] == 'o') {
441 optbuf = strdup(mntopts);
443 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
444 if (opt[0] == 'n' && opt[1] == 'o') {
445 if (!strcasecmp(opt + 2, option))
447 } else if (!strcasecmp(opt, option))
455 mountfs(const char *vfstype, const char *spec, const char *name, int flags,
456 const char *options, const char *mntopts)
461 char *optbuf, execname[PATH_MAX], mntpath[PATH_MAX];
463 /* resolve the mountpoint with realpath(3) */
464 (void)checkpath(name, mntpath);
469 optbuf = catopt(strdup(mntopts), options);
471 if (strcmp(name, "/") == 0)
473 if (flags & MNT_FORCE)
474 optbuf = catopt(optbuf, "force");
475 if (flags & MNT_RDONLY)
476 optbuf = catopt(optbuf, "ro");
479 * The mount_mfs (newfs) command uses -o to select the
480 * optimization mode. We don't pass the default "-o rw"
483 if (flags & MNT_UPDATE)
484 optbuf = catopt(optbuf, "update");
486 /* Compatibility glue. */
487 if (strcmp(vfstype, "msdos") == 0)
490 /* Construct the name of the appropriate mount command */
491 (void)snprintf(execname, sizeof(execname), "mount_%s", vfstype);
494 argv[argc++] = execname;
495 mangle(optbuf, &argc, argv);
496 argv[argc++] = strdup(spec);
497 argv[argc++] = strdup(name);
501 (void)printf("exec: mount_%s", vfstype);
502 for (i = 1; i < argc; i++)
503 (void)printf(" %s", argv[i]);
508 if (use_mountprog(vfstype)) {
509 ret = exec_mountprog(name, execname, argv);
511 ret = mount_fs(vfstype, argc, argv);
517 if (statfs(name, &sf) < 0) {
518 warn("statfs %s", name);
531 prmount(struct statfs *sfp)
538 (void)printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
541 flags = sfp->f_flags & MNT_VISFLAGMASK;
542 for (o = optnames; flags && o->o_opt; o++)
543 if (flags & o->o_opt) {
544 (void)printf(", %s", o->o_name);
548 * Inform when file system is mounted by an unprivileged user
549 * or privileged non-root user.
551 if ((flags & MNT_USER) != 0 || sfp->f_owner != 0) {
552 (void)printf(", mounted by ");
553 if ((pw = getpwuid(sfp->f_owner)) != NULL)
554 (void)printf("%s", pw->pw_name);
556 (void)printf("%d", sfp->f_owner);
559 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
560 (void)printf(", writes: sync %ju async %ju",
561 (uintmax_t)sfp->f_syncwrites,
562 (uintmax_t)sfp->f_asyncwrites);
563 if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
564 (void)printf(", reads: sync %ju async %ju",
565 (uintmax_t)sfp->f_syncreads,
566 (uintmax_t)sfp->f_asyncreads);
567 if (sfp->f_fsid.val[0] != 0 || sfp->f_fsid.val[1] != 0) {
569 for (i = 0; i < sizeof(sfp->f_fsid); i++)
570 printf("%02x", ((u_char *)&sfp->f_fsid)[i]);
577 getmntpt(const char *name)
579 struct statfs *mntbuf;
582 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
583 for (i = mntsize - 1; i >= 0; i--) {
584 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
585 strcmp(mntbuf[i].f_mntonname, name) == 0)
592 catopt(char *s0, const char *s1)
597 if (s1 == NULL || *s1 == '\0')
601 i = strlen(s0) + strlen(s1) + 1 + 1;
602 if ((cp = malloc(i)) == NULL)
603 errx(1, "malloc failed");
604 (void)snprintf(cp, i, "%s,%s", s0, s1);
614 mangle(char *options, int *argcp, char *argv[])
620 for (s = options; (p = strsep(&s, ",")) != NULL;)
622 if (strcmp(p, "noauto") == 0) {
624 * Do not pass noauto option to nmount().
625 * or external mount program. noauto is
626 * only used to prevent mounting a filesystem
627 * when 'mount -a' is specified, and is
628 * not a real mount option.
631 } else if (strcmp(p, "userquota") == 0) {
633 } else if (strncmp(p, userquotaeq,
634 sizeof(userquotaeq) - 1) == 0) {
636 } else if (strcmp(p, "groupquota") == 0) {
638 } else if (strncmp(p, groupquotaeq,
639 sizeof(groupquotaeq) - 1) == 0) {
641 } else if (*p == '-') {
649 argv[argc++] = strdup("-o");
659 update_options(char *opts, char *fstab, int curflags)
663 char *expopt, *newopt, *tmpopt;
668 /* remove meta options from list */
669 remopt(fstab, MOUNT_META_OPTION_FSTAB);
670 remopt(fstab, MOUNT_META_OPTION_CURRENT);
671 cur = flags2opts(curflags);
674 * Expand all meta-options passed to us first.
677 for (p = opts; (o = strsep(&p, ",")) != NULL;) {
678 if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
679 expopt = catopt(expopt, fstab);
680 else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
681 expopt = catopt(expopt, cur);
683 expopt = catopt(expopt, o);
689 * Remove previous contradictory arguments. Given option "foo" we
690 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
691 * and "foo" - so we can deal with possible options like "notice".
694 for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
695 if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
696 errx(1, "malloc failed");
698 strcpy(tmpopt, "no");
700 remopt(newopt, tmpopt);
703 if (strncmp("no", o, 2) == 0)
706 newopt = catopt(newopt, o);
714 remopt(char *string, const char *opt)
718 if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
723 for (p = string; (o = strsep(&p, ",")) != NULL;) {
724 if (strcmp(opt, o) != 0) {
725 if (*r == ',' && *o != '\0')
727 while ((*r++ = *o++) != '\0')
739 (void)fprintf(stderr, "%s\n%s\n%s\n",
740 "usage: mount [-adfpruvw] [-F fstab] [-o options] [-t ufs | external_type]",
741 " mount [-dfpruvw] special | node",
742 " mount [-dfpruvw] [-o options] [-t ufs | external_type] special node");
747 putfsent(const struct statfs *ent)
752 opts = flags2opts(ent->f_flags);
755 * "rw" is not a real mount option; this is why we print NULL as "rw"
756 * if opts is still NULL here.
758 printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
759 ent->f_fstypename, opts ? opts : "rw");
762 if ((fst = getfsspec(ent->f_mntfromname)))
763 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
764 else if ((fst = getfsfile(ent->f_mntonname)))
765 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
766 else if (strcmp(ent->f_fstypename, "ufs") == 0) {
767 if (strcmp(ent->f_mntonname, "/") == 0)
777 flags2opts(int flags)
783 if (flags & MNT_RDONLY) res = catopt(res, "ro");
784 if (flags & MNT_SYNCHRONOUS) res = catopt(res, "sync");
785 if (flags & MNT_NOEXEC) res = catopt(res, "noexec");
786 if (flags & MNT_NOSUID) res = catopt(res, "nosuid");
787 if (flags & MNT_UNION) res = catopt(res, "union");
788 if (flags & MNT_ASYNC) res = catopt(res, "async");
789 if (flags & MNT_NOATIME) res = catopt(res, "noatime");
790 if (flags & MNT_NOCLUSTERR) res = catopt(res, "noclusterr");
791 if (flags & MNT_NOCLUSTERW) res = catopt(res, "noclusterw");
792 if (flags & MNT_NOSYMFOLLOW) res = catopt(res, "nosymfollow");
793 if (flags & MNT_SUIDDIR) res = catopt(res, "suiddir");
794 if (flags & MNT_MULTILABEL) res = catopt(res, "multilabel");
795 if (flags & MNT_ACLS) res = catopt(res, "acls");