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
8 * 1. Redistributions of source code must retain the above copyright
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14 * may be used to endorse or promote products derived from this software
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29 * @(#) Copyright (c) 1980, 1989, 1993, 1994 The Regents of the University of California. All rights reserved.
30 * @(#)mount.c 8.25 (Berkeley) 5/8/95
31 * $FreeBSD: src/sbin/mount/mount.c,v 1.39.2.3 2001/08/01 08:26:23 obrien Exp $
34 #include <sys/param.h>
35 #include <sys/mount.h>
36 #include <sys/mountctl.h>
52 #include "pathnames.h"
55 #define MOUNT_META_OPTION_FSTAB "fstab"
56 #define MOUNT_META_OPTION_CURRENT "current"
58 int debug, fstab_style, verbose;
60 static char *catopt(char *, const char *);
62 *getmntpt(const char *);
63 static int hasopt(const char *, const char *);
64 static int ismounted(struct fstab *, struct statfs *, int);
65 static int isremountable(const char *);
66 static void mangle(char *, int *, const char **);
67 static char *update_options(char *, char *, int);
68 static int mountfs(const char *, const char *, const char *,
69 int, const char *, const char *);
70 static void remopt(char *, const char *);
71 static void printdefvals(const struct statfs *);
72 static void prmount(struct statfs *);
73 static void putfsent(const struct statfs *);
74 static void usage(void);
75 static char *flags2opts(int);
76 static char *xstrdup(const char *str);
79 int mount_ufs(int, const char **);
82 * List of VFS types that can be remounted without becoming mounted on top
84 * XXX Is this list correct?
87 remountable_fs_names[] = {
88 "ufs", "ffs", "ext2fs",
93 main(int argc, char **argv)
95 const char *mntfromname, **vfslist, *vfstype;
97 struct statfs *mntbuf;
100 int all, ch, i, init_flags, mntsize, rval, have_fstab;
103 all = init_flags = 0;
107 while ((ch = getopt(argc, argv, "adF:fo:prwt:uv")) != -1)
119 init_flags |= MNT_FORCE;
123 options = catopt(options, optarg);
130 options = catopt(options, "ro");
134 errx(1, "only one -t option may be specified");
135 vfslist = makevfslist(optarg);
139 init_flags |= MNT_UPDATE;
145 options = catopt(options, "noro");
155 #define BADTYPE(type) \
156 (strcmp(type, FSTAB_RO) && \
157 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
162 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
163 err(1, "getmntinfo");
165 while ((fs = getfsent()) != NULL) {
166 if (BADTYPE(fs->fs_type))
168 if (checkvfsname(fs->fs_vfstype, vfslist))
170 if (hasopt(fs->fs_mntops, "noauto"))
172 if (!(init_flags & MNT_UPDATE) &&
173 ismounted(fs, mntbuf, mntsize))
175 options = update_options(options,
176 fs->fs_mntops, mntbuf->f_flags);
177 if (mountfs(fs->fs_vfstype, fs->fs_spec,
178 fs->fs_file, init_flags, options,
182 } else if (fstab_style) {
183 for (i = 0; i < mntsize; i++) {
184 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
186 putfsent(&mntbuf[i]);
189 for (i = 0; i < mntsize; i++) {
190 if (checkvfsname(mntbuf[i].f_fstypename,
201 rmslashes(*argv, *argv);
203 if (init_flags & MNT_UPDATE) {
206 if ((mntbuf = getmntpt(*argv)) == NULL)
207 errx(1, "not currently mounted %s", *argv);
209 * Only get the mntflags from fstab if both mntpoint
210 * and mntspec are identical. Also handle the special
211 * case where just '/' is mounted and 'spec' is not
212 * identical with the one from fstab ('/dev' is missing
213 * in the spec-string at boot-time).
215 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
216 if (strcmp(fs->fs_spec,
217 mntbuf->f_mntfromname) == 0 &&
219 mntbuf->f_mntonname) == 0) {
221 mntfromname = mntbuf->f_mntfromname;
222 } else if (argv[0][0] == '/' &&
223 argv[0][1] == '\0') {
226 mntfromname = fs->fs_spec;
230 options = update_options(options, fs->fs_mntops,
233 mntfromname = mntbuf->f_mntfromname;
234 options = update_options(options, NULL,
237 rval = mountfs(mntbuf->f_fstypename, mntfromname,
238 mntbuf->f_mntonname, init_flags, options, 0);
241 if ((fs = getfsfile(*argv)) == NULL &&
242 (fs = getfsspec(*argv)) == NULL)
243 errx(1, "%s: unknown special file or file system",
245 if (BADTYPE(fs->fs_type))
246 errx(1, "%s has unknown file system type",
248 rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
249 init_flags, options, fs->fs_mntops);
253 * If -t flag has not been specified, the path cannot be
254 * found, spec contains either a ':' or a '@', and the
255 * spec is not a file with those characters, then assume
256 * that an NFS filesystem is being specified ala Sun.
258 if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL &&
259 access(argv[0], 0) == -1)
261 rval = mountfs(vfstype, getdevpath(argv[0], 0), argv[1],
262 init_flags, options, NULL);
270 * If the mount was successfully, and done by root, tell mountd the
271 * good news. Pid checks are probably unnecessary, but don't hurt.
273 if (rval == 0 && getuid() == 0 &&
274 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
275 if (fscanf(mountdfp, "%d", &pid) == 1 &&
276 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
277 err(1, "signal mountd");
285 ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
289 if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
290 /* the root file system can always be remounted */
293 for (i = mntsize - 1; i >= 0; --i)
294 if (strcmp(fs->fs_file, mntbuf[i].f_mntonname) == 0 &&
295 (!isremountable(fs->fs_vfstype) ||
296 strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
302 isremountable(const char *vfsname)
306 for (cp = remountable_fs_names; *cp; cp++)
307 if (strcmp(*cp, vfsname) == 0)
313 hasopt(const char *mntopts, const char *option)
318 if (option[0] == 'n' && option[1] == 'o') {
323 optbuf = xstrdup(mntopts);
325 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
326 if (opt[0] == 'n' && opt[1] == 'o') {
327 if (!strcasecmp(opt + 2, option))
329 } else if (!strcasecmp(opt, option))
337 mountfs(const char *vfstype, const char *spec, const char *name, int flags,
338 const char *options, const char *mntopts)
340 /* List of directories containing mount_xxx subcommands. */
341 static const char *edirs[] = {
346 const char *argv[100], **edir;
350 char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
357 /* resolve the mountpoint with realpath(3) */
358 checkpath(name, mntpath);
363 if (options == NULL) {
364 if (*mntopts == '\0') {
371 optbuf = catopt(xstrdup(mntopts), options);
373 if (strcmp(name, "/") == 0)
375 if (flags & MNT_FORCE)
376 optbuf = catopt(optbuf, "force");
377 if (flags & MNT_RDONLY)
378 optbuf = catopt(optbuf, "ro");
381 * The mount_mfs (newfs) command uses -o to select the
382 * optimization mode. We don't pass the default "-o rw"
385 if (flags & MNT_UPDATE)
386 optbuf = catopt(optbuf, "update");
389 argv[argc++] = vfstype;
390 mangle(optbuf, &argc, argv);
396 printf("exec: mount_%s", vfstype);
397 for (i = 1; i < argc; i++)
398 printf(" %s", argv[i]);
403 switch (pid = fork()) {
404 case -1: /* Error. */
409 if (strcmp(vfstype, "ufs") == 0)
410 exit(mount_ufs(argc, argv));
412 /* Go find an executable. */
413 for (edir = edirs; *edir; edir++) {
415 sizeof(execname), "%s/mount_%s", *edir, vfstype);
416 execv(execname, __DECONST(char * const *, argv));
418 if (errno == ENOENT) {
421 for (edir = edirs; *edir; edir++)
422 len += strlen(*edir) + 2; /* ", " */
423 if ((cp = malloc(len)) == NULL)
424 errx(1, "malloc failed");
426 for (edir = edirs; *edir; edir++) {
431 warn("exec mount_%s not found in %s", vfstype, cp);
435 default: /* Parent. */
438 if (waitpid(pid, &status, 0) < 0) {
443 if (WIFEXITED(status)) {
444 if (WEXITSTATUS(status) != 0)
445 return (WEXITSTATUS(status));
446 } else if (WIFSIGNALED(status)) {
447 warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
452 if (statfs(name, &sf) < 0) {
453 warn("statfs %s", name);
468 prmount(struct statfs *sfp)
478 if ((buf = malloc(len)) == NULL)
479 errx(1, "malloc failed");
481 printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
484 /* Get a string buffer with all the used flags names */
485 error = mountctl(sfp->f_mntonname, MOUNTCTL_MOUNTFLAGS,
486 -1, NULL, 0, buf, len);
489 printf(", mounted by ");
490 if ((pw = getpwuid(sfp->f_owner)) != NULL)
491 printf("%s", pw->pw_name);
493 printf("%d", sfp->f_owner);
496 if (error != -1 && strlen(buf))
500 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
501 printf(", writes: sync %ld async %ld",
502 sfp->f_syncwrites, sfp->f_asyncwrites);
503 if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
504 printf(", reads: sync %ld async %ld",
505 sfp->f_syncreads, sfp->f_asyncreads);
510 static struct statfs *
511 getmntpt(const char *name)
513 struct statfs *mntbuf;
516 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
517 for (i = mntsize - 1; i >= 0; i--) {
518 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
519 strcmp(mntbuf[i].f_mntonname, name) == 0)
526 catopt(char *s0, const char *s1)
531 if (s1 == NULL || *s1 == '\0')
535 i = strlen(s0) + strlen(s1) + 1 + 1;
536 if ((cp = malloc(i)) == NULL)
537 errx(1, "malloc failed");
538 snprintf(cp, i, "%s,%s", s0, s1);
548 mangle(char *options, int *argcp, const char **argv)
554 for (s = options; (p = strsep(&s, ",")) != NULL;)
563 } else if (strcmp(p, "rw") != 0) {
574 update_options(char *opts, char *fstab, int curflags)
578 char *expopt, *newopt, *tmpopt;
583 /* remove meta options from list */
584 remopt(fstab, MOUNT_META_OPTION_FSTAB);
585 remopt(fstab, MOUNT_META_OPTION_CURRENT);
586 cur = flags2opts(curflags);
589 * Expand all meta-options passed to us first.
592 for (p = opts; (o = strsep(&p, ",")) != NULL;) {
593 if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
594 expopt = catopt(expopt, fstab);
595 else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
596 expopt = catopt(expopt, cur);
598 expopt = catopt(expopt, o);
604 * Remove previous contradictory arguments. Given option "foo" we
605 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
606 * and "foo" - so we can deal with possible options like "notice".
609 for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
610 if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
611 errx(1, "malloc failed");
613 strcpy(tmpopt, "no");
615 remopt(newopt, tmpopt);
618 if (strncmp("no", o, 2) == 0)
621 newopt = catopt(newopt, o);
629 remopt(char *string, const char *opt)
633 if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
638 for (p = string; (o = strsep(&p, ",")) != NULL;) {
639 if (strcmp(opt, o) != 0) {
640 if (*r == ',' && *o != '\0')
642 while ((*r++ = *o++) != '\0')
654 fprintf(stderr, "%s\n%s\n%s\n",
655 "usage: mount [-adfpruvw] [-F fstab] [-o options] [-t type]",
656 " mount [-dfpruvw] {special | node}",
657 " mount [-dfpruvw] [-o options] [-t type] special node");
662 * Prints the default values for dump frequency and pass number of fsck.
663 * This happens when mount(8) is called with -p and there is no fstab file
664 * or there is but the values aren't specified.
667 printdefvals(const struct statfs *ent)
669 if (strcmp(ent->f_fstypename, "ufs") == 0) {
670 if (strcmp(ent->f_mntonname, "/") == 0)
680 putfsent(const struct statfs *ent)
686 opts = flags2opts(ent->f_flags);
687 printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
688 ent->f_fstypename, opts);
692 * If fstab file is missing don't call getfsspec() or getfsfile()
693 * at all, because the same warning will be printed twice for every
694 * mounted filesystem.
696 if (stat(_PATH_FSTAB, &sb) != -1) {
697 if ((fst = getfsspec(ent->f_mntfromname)))
698 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
699 else if ((fst = getfsfile(ent->f_mntonname)))
700 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
710 flags2opts(int flags)
716 res = catopt(res, (flags & MNT_RDONLY) ? "ro" : "rw");
718 if (flags & MNT_SYNCHRONOUS) res = catopt(res, "sync");
719 if (flags & MNT_NOEXEC) res = catopt(res, "noexec");
720 if (flags & MNT_NOSUID) res = catopt(res, "nosuid");
721 if (flags & MNT_NODEV) res = catopt(res, "nodev");
722 if (flags & MNT_UNION) res = catopt(res, "union");
723 if (flags & MNT_ASYNC) res = catopt(res, "async");
724 if (flags & MNT_NOATIME) res = catopt(res, "noatime");
725 if (flags & MNT_NOCLUSTERR) res = catopt(res, "noclusterr");
726 if (flags & MNT_NOCLUSTERW) res = catopt(res, "noclusterw");
727 if (flags & MNT_NOSYMFOLLOW) res = catopt(res, "nosymfollow");
728 if (flags & MNT_SUIDDIR) res = catopt(res, "suiddir");
729 if (flags & MNT_IGNORE) res = catopt(res, "ignore");
735 xstrdup(const char *str)
737 char* ret = strdup(str);
739 errx(1, "strdup failed (could not allocate memory)");