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
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15 * This product includes software developed by the University of
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33 * @(#) Copyright (c) 1980, 1989, 1993, 1994 The Regents of the University of California. All rights reserved.
34 * @(#)mount.c 8.25 (Berkeley) 5/8/95
35 * $FreeBSD: src/sbin/mount/mount.c,v 1.39.2.3 2001/08/01 08:26:23 obrien Exp $
36 * $DragonFly: src/sbin/mount/mount.c,v 1.10 2005/04/03 17:13:08 joerg Exp $
39 #include <sys/param.h>
40 #include <sys/mount.h>
56 #include "pathnames.h"
59 #define MOUNT_META_OPTION_FSTAB "fstab"
60 #define MOUNT_META_OPTION_CURRENT "current"
62 int debug, fstab_style, verbose;
64 static char *catopt(char *, const char *);
66 *getmntpt(const char *);
67 static int hasopt(const char *, const char *);
68 static int ismounted(struct fstab *, struct statfs *, int);
69 static int isremountable(const char *);
70 static void mangle(char *, int *, const char **);
71 static char *update_options(char *, char *, int);
72 static int mountfs(const char *, const char *, const char *,
73 int, const char *, const char *);
74 static void remopt(char *, const char *);
75 static void printdefvals(const struct statfs *);
76 static void prmount(struct statfs *);
77 static void putfsent(const struct statfs *);
78 static void usage(void);
79 static char *flags2opts(int);
80 static char *xstrdup(const char *str);
82 /* Map from mount options to printable formats. */
87 { MNT_ASYNC, "asynchronous" },
88 { MNT_EXPORTED, "NFS exported" },
89 { MNT_LOCAL, "local" },
90 { MNT_NOATIME, "noatime" },
91 { MNT_NODEV, "nodev" },
92 { MNT_NOEXEC, "noexec" },
93 { MNT_NOSUID, "nosuid" },
94 { MNT_NOSYMFOLLOW, "nosymfollow" },
95 { MNT_QUOTA, "with quotas" },
96 { MNT_RDONLY, "read-only" },
97 { MNT_SYNCHRONOUS, "synchronous" },
98 { MNT_UNION, "union" },
99 { MNT_NOCLUSTERR, "noclusterr" },
100 { MNT_NOCLUSTERW, "noclusterw" },
101 { MNT_SUIDDIR, "suiddir" },
102 { MNT_SOFTDEP, "soft-updates" },
103 { MNT_IGNORE, "ignore" },
108 * List of VFS types that can be remounted without becoming mounted on top
110 * XXX Is this list correct?
113 remountable_fs_names[] = {
114 "ufs", "ffs", "ext2fs",
119 main(int argc, char **argv)
121 const char *mntfromname, **vfslist, *vfstype;
123 struct statfs *mntbuf;
126 int all, ch, i, init_flags, mntsize, rval, have_fstab;
129 all = init_flags = 0;
133 while ((ch = getopt(argc, argv, "adfo:prwt:uv")) != -1)
142 init_flags |= MNT_FORCE;
146 options = catopt(options, optarg);
153 options = catopt(options, "ro");
157 errx(1, "only one -t option may be specified");
158 vfslist = makevfslist(optarg);
162 init_flags |= MNT_UPDATE;
168 options = catopt(options, "noro");
178 #define BADTYPE(type) \
179 (strcmp(type, FSTAB_RO) && \
180 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
185 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
186 err(1, "getmntinfo");
188 while ((fs = getfsent()) != NULL) {
189 if (BADTYPE(fs->fs_type))
191 if (checkvfsname(fs->fs_vfstype, vfslist))
193 if (hasopt(fs->fs_mntops, "noauto"))
195 if (!(init_flags & MNT_UPDATE) &&
196 ismounted(fs, mntbuf, mntsize))
198 options = update_options(options,
199 fs->fs_mntops, mntbuf->f_flags);
200 if (mountfs(fs->fs_vfstype, fs->fs_spec,
201 fs->fs_file, init_flags, options,
205 } else if (fstab_style) {
206 for (i = 0; i < mntsize; i++) {
207 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
209 putfsent(&mntbuf[i]);
212 for (i = 0; i < mntsize; i++) {
213 if (checkvfsname(mntbuf[i].f_fstypename,
224 rmslashes(*argv, *argv);
226 if (init_flags & MNT_UPDATE) {
229 if ((mntbuf = getmntpt(*argv)) == NULL)
230 errx(1, "not currently mounted %s", *argv);
232 * Only get the mntflags from fstab if both mntpoint
233 * and mntspec are identical. Also handle the special
234 * case where just '/' is mounted and 'spec' is not
235 * identical with the one from fstab ('/dev' is missing
236 * in the spec-string at boot-time).
238 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
239 if (strcmp(fs->fs_spec,
240 mntbuf->f_mntfromname) == 0 &&
242 mntbuf->f_mntonname) == 0) {
244 mntfromname = mntbuf->f_mntfromname;
245 } else if (argv[0][0] == '/' &&
246 argv[0][1] == '\0') {
249 mntfromname = fs->fs_spec;
253 options = update_options(options, fs->fs_mntops,
256 mntfromname = mntbuf->f_mntfromname;
257 options = update_options(options, NULL,
260 rval = mountfs(mntbuf->f_fstypename, mntfromname,
261 mntbuf->f_mntonname, init_flags, options, 0);
264 if ((fs = getfsfile(*argv)) == NULL &&
265 (fs = getfsspec(*argv)) == NULL)
266 errx(1, "%s: unknown special file or file system",
268 if (BADTYPE(fs->fs_type))
269 errx(1, "%s has unknown file system type",
271 rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
272 init_flags, options, fs->fs_mntops);
276 * If -t flag has not been specified, the path cannot be
277 * found, spec contains either a ':' or a '@', and the
278 * spec is not a file with those characters, then assume
279 * that an NFS filesystem is being specified ala Sun.
281 if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL &&
282 access(argv[0], 0) == -1)
284 rval = mountfs(vfstype,
285 argv[0], argv[1], init_flags, options, NULL);
293 * If the mount was successfully, and done by root, tell mountd the
294 * good news. Pid checks are probably unnecessary, but don't hurt.
296 if (rval == 0 && getuid() == 0 &&
297 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
298 if (fscanf(mountdfp, "%d", &pid) == 1 &&
299 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
300 err(1, "signal mountd");
308 ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
312 if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
313 /* the root file system can always be remounted */
316 for (i = mntsize - 1; i >= 0; --i)
317 if (strcmp(fs->fs_file, mntbuf[i].f_mntonname) == 0 &&
318 (!isremountable(fs->fs_vfstype) ||
319 strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
325 isremountable(const char *vfsname)
329 for (cp = remountable_fs_names; *cp; cp++)
330 if (strcmp(*cp, vfsname) == 0)
336 hasopt(const char *mntopts, const char *option)
341 if (option[0] == 'n' && option[1] == 'o') {
346 optbuf = xstrdup(mntopts);
348 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
349 if (opt[0] == 'n' && opt[1] == 'o') {
350 if (!strcasecmp(opt + 2, option))
352 } else if (!strcasecmp(opt, option))
360 mountfs(const char *vfstype, const char *spec, const char *name, int flags,
361 const char *options, const char *mntopts)
363 /* List of directories containing mount_xxx subcommands. */
364 static const char *edirs[] = {
369 const char *argv[100], **edir;
373 char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
380 /* resolve the mountpoint with realpath(3) */
381 checkpath(name, mntpath);
386 if (options == NULL) {
387 if (*mntopts == '\0') {
394 optbuf = catopt(xstrdup(mntopts), options);
396 if (strcmp(name, "/") == 0)
398 if (flags & MNT_FORCE)
399 optbuf = catopt(optbuf, "force");
400 if (flags & MNT_RDONLY)
401 optbuf = catopt(optbuf, "ro");
404 * The mount_mfs (newfs) command uses -o to select the
405 * optimization mode. We don't pass the default "-o rw"
408 if (flags & MNT_UPDATE)
409 optbuf = catopt(optbuf, "update");
412 argv[argc++] = vfstype;
413 mangle(optbuf, &argc, argv);
419 printf("exec: mount_%s", vfstype);
420 for (i = 1; i < argc; i++)
421 printf(" %s", argv[i]);
426 switch (pid = fork()) {
427 case -1: /* Error. */
432 if (strcmp(vfstype, "ufs") == 0)
433 exit(mount_ufs(argc, argv));
435 /* Go find an executable. */
436 for (edir = edirs; *edir; edir++) {
438 sizeof(execname), "%s/mount_%s", *edir, vfstype);
439 execv(execname, __DECONST(char * const *, argv));
441 if (errno == ENOENT) {
444 for (edir = edirs; *edir; edir++)
445 len += strlen(*edir) + 2; /* ", " */
446 if ((cp = malloc(len)) == NULL)
447 errx(1, "malloc failed");
449 for (edir = edirs; *edir; edir++) {
454 warn("exec mount_%s not found in %s", vfstype, cp);
458 default: /* Parent. */
461 if (waitpid(pid, &status, 0) < 0) {
466 if (WIFEXITED(status)) {
467 if (WEXITSTATUS(status) != 0)
468 return (WEXITSTATUS(status));
469 } else if (WIFSIGNALED(status)) {
470 warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
475 if (statfs(name, &sf) < 0) {
476 warn("statfs %s", name);
491 prmount(struct statfs *sfp)
497 printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
500 flags = sfp->f_flags & MNT_VISFLAGMASK;
501 for (o = optnames; flags && o->o_opt; o++)
502 if (flags & o->o_opt) {
503 printf(", %s", o->o_name);
507 printf(", mounted by ");
508 if ((pw = getpwuid(sfp->f_owner)) != NULL)
509 printf("%s", pw->pw_name);
511 printf("%d", sfp->f_owner);
514 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
515 printf(", writes: sync %ld async %ld",
516 sfp->f_syncwrites, sfp->f_asyncwrites);
517 if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
518 printf(", reads: sync %ld async %ld",
519 sfp->f_syncreads, sfp->f_asyncreads);
524 static struct statfs *
525 getmntpt(const char *name)
527 struct statfs *mntbuf;
530 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
531 for (i = mntsize - 1; i >= 0; i--) {
532 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
533 strcmp(mntbuf[i].f_mntonname, name) == 0)
540 catopt(char *s0, const char *s1)
545 if (s1 == NULL || *s1 == '\0')
549 i = strlen(s0) + strlen(s1) + 1 + 1;
550 if ((cp = malloc(i)) == NULL)
551 errx(1, "malloc failed");
552 snprintf(cp, i, "%s,%s", s0, s1);
562 mangle(char *options, int *argcp, const char **argv)
568 for (s = options; (p = strsep(&s, ",")) != NULL;)
577 } else if (strcmp(p, "rw") != 0) {
588 update_options(char *opts, char *fstab, int curflags)
592 char *expopt, *newopt, *tmpopt;
597 /* remove meta options from list */
598 remopt(fstab, MOUNT_META_OPTION_FSTAB);
599 remopt(fstab, MOUNT_META_OPTION_CURRENT);
600 cur = flags2opts(curflags);
603 * Expand all meta-options passed to us first.
606 for (p = opts; (o = strsep(&p, ",")) != NULL;) {
607 if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
608 expopt = catopt(expopt, fstab);
609 else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
610 expopt = catopt(expopt, cur);
612 expopt = catopt(expopt, o);
618 * Remove previous contradictory arguments. Given option "foo" we
619 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
620 * and "foo" - so we can deal with possible options like "notice".
623 for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
624 if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
625 errx(1, "malloc failed");
627 strcpy(tmpopt, "no");
629 remopt(newopt, tmpopt);
632 if (strncmp("no", o, 2) == 0)
635 newopt = catopt(newopt, o);
643 remopt(char *string, const char *opt)
647 if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
652 for (p = string; (o = strsep(&p, ",")) != NULL;) {
653 if (strcmp(opt, o) != 0) {
654 if (*r == ',' && *o != '\0')
656 while ((*r++ = *o++) != '\0')
668 fprintf(stderr, "%s\n%s\n%s\n",
669 "usage: mount [-dfpruvw] [-o options] [-t ufs | external_type] special node",
670 " mount [-adfpruvw] [-o options] [-t ufs | external_type]",
671 " mount [-dfpruvw] special | node");
676 * Prints the default values for dump frequency and pass number of fsck.
677 * This happens when mount(8) is called with -p and there is no fstab file
678 * or there is but the values aren't specified.
681 printdefvals(const struct statfs *ent)
683 if (strcmp(ent->f_fstypename, "ufs") == 0) {
684 if (strcmp(ent->f_mntonname, "/") == 0)
694 putfsent(const struct statfs *ent)
700 opts = flags2opts(ent->f_flags);
701 printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
702 ent->f_fstypename, opts);
706 * If fstab file is missing don't call getfsspec() or getfsfile()
707 * at all, because the same warning will be printed twice for every
708 * mounted filesystem.
710 if (stat(_PATH_FSTAB, &sb) != -1) {
711 if ((fst = getfsspec(ent->f_mntfromname)))
712 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
713 else if ((fst = getfsfile(ent->f_mntonname)))
714 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
724 flags2opts(int flags)
730 res = catopt(res, (flags & MNT_RDONLY) ? "ro" : "rw");
732 if (flags & MNT_SYNCHRONOUS) res = catopt(res, "sync");
733 if (flags & MNT_NOEXEC) res = catopt(res, "noexec");
734 if (flags & MNT_NOSUID) res = catopt(res, "nosuid");
735 if (flags & MNT_NODEV) res = catopt(res, "nodev");
736 if (flags & MNT_UNION) res = catopt(res, "union");
737 if (flags & MNT_ASYNC) res = catopt(res, "async");
738 if (flags & MNT_NOATIME) res = catopt(res, "noatime");
739 if (flags & MNT_NOCLUSTERR) res = catopt(res, "noclusterr");
740 if (flags & MNT_NOCLUSTERW) res = catopt(res, "noclusterw");
741 if (flags & MNT_NOSYMFOLLOW) res = catopt(res, "nosymfollow");
742 if (flags & MNT_SUIDDIR) res = catopt(res, "suiddir");
743 if (flags & MNT_IGNORE) res = catopt(res, "ignore");
749 xstrdup(const char *str)
751 char* ret = strdup(str);
753 errx(1, "strdup failed (could not allocate memory)");