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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14 * must display the following acknowledgement:
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 prmount(struct statfs *);
76 static void putfsent(const struct statfs *);
77 static void usage(void);
78 static char *flags2opts(int);
79 static char *xstrdup(const char *str);
81 /* Map from mount options to printable formats. */
86 { MNT_ASYNC, "asynchronous" },
87 { MNT_EXPORTED, "NFS exported" },
88 { MNT_LOCAL, "local" },
89 { MNT_NOATIME, "noatime" },
90 { MNT_NODEV, "nodev" },
91 { MNT_NOEXEC, "noexec" },
92 { MNT_NOSUID, "nosuid" },
93 { MNT_NOSYMFOLLOW, "nosymfollow" },
94 { MNT_QUOTA, "with quotas" },
95 { MNT_RDONLY, "read-only" },
96 { MNT_SYNCHRONOUS, "synchronous" },
97 { MNT_UNION, "union" },
98 { MNT_NOCLUSTERR, "noclusterr" },
99 { MNT_NOCLUSTERW, "noclusterw" },
100 { MNT_SUIDDIR, "suiddir" },
101 { MNT_SOFTDEP, "soft-updates" },
106 * List of VFS types that can be remounted without becoming mounted on top
108 * XXX Is this list correct?
111 remountable_fs_names[] = {
112 "ufs", "ffs", "ext2fs",
117 main(int argc, char **argv)
119 const char *mntfromname, **vfslist, *vfstype;
121 struct statfs *mntbuf;
124 int all, ch, i, init_flags, mntsize, rval, have_fstab;
127 all = init_flags = 0;
131 while ((ch = getopt(argc, argv, "adfo:prwt:uv")) != -1)
140 init_flags |= MNT_FORCE;
144 options = catopt(options, optarg);
151 options = catopt(options, "ro");
155 errx(1, "only one -t option may be specified");
156 vfslist = makevfslist(optarg);
160 init_flags |= MNT_UPDATE;
166 options = catopt(options, "noro");
176 #define BADTYPE(type) \
177 (strcmp(type, FSTAB_RO) && \
178 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
183 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
184 err(1, "getmntinfo");
186 while ((fs = getfsent()) != NULL) {
187 if (BADTYPE(fs->fs_type))
189 if (checkvfsname(fs->fs_vfstype, vfslist))
191 if (hasopt(fs->fs_mntops, "noauto"))
193 if (!(init_flags & MNT_UPDATE) &&
194 ismounted(fs, mntbuf, mntsize))
196 options = update_options(options,
197 fs->fs_mntops, mntbuf->f_flags);
198 if (mountfs(fs->fs_vfstype, fs->fs_spec,
199 fs->fs_file, init_flags, options,
203 } else if (fstab_style) {
204 for (i = 0; i < mntsize; i++) {
205 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
207 putfsent(&mntbuf[i]);
210 for (i = 0; i < mntsize; i++) {
211 if (checkvfsname(mntbuf[i].f_fstypename,
222 rmslashes(*argv, *argv);
224 if (init_flags & MNT_UPDATE) {
227 if ((mntbuf = getmntpt(*argv)) == NULL)
228 errx(1, "not currently mounted %s", *argv);
230 * Only get the mntflags from fstab if both mntpoint
231 * and mntspec are identical. Also handle the special
232 * case where just '/' is mounted and 'spec' is not
233 * identical with the one from fstab ('/dev' is missing
234 * in the spec-string at boot-time).
236 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
237 if (strcmp(fs->fs_spec,
238 mntbuf->f_mntfromname) == 0 &&
240 mntbuf->f_mntonname) == 0) {
242 mntfromname = mntbuf->f_mntfromname;
243 } else if (argv[0][0] == '/' &&
244 argv[0][1] == '\0') {
247 mntfromname = fs->fs_spec;
251 options = update_options(options, fs->fs_mntops,
254 mntfromname = mntbuf->f_mntfromname;
255 options = update_options(options, NULL,
258 rval = mountfs(mntbuf->f_fstypename, mntfromname,
259 mntbuf->f_mntonname, init_flags, options, 0);
262 if ((fs = getfsfile(*argv)) == NULL &&
263 (fs = getfsspec(*argv)) == NULL)
264 errx(1, "%s: unknown special file or file system",
266 if (BADTYPE(fs->fs_type))
267 errx(1, "%s has unknown file system type",
269 rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file,
270 init_flags, options, fs->fs_mntops);
274 * If -t flag has not been specified, the path cannot be
275 * found, spec contains either a ':' or a '@', and the
276 * spec is not a file with those characters, then assume
277 * that an NFS filesystem is being specified ala Sun.
279 if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL &&
280 access(argv[0], 0) == -1)
282 rval = mountfs(vfstype,
283 argv[0], argv[1], init_flags, options, NULL);
291 * If the mount was successfully, and done by root, tell mountd the
292 * good news. Pid checks are probably unnecessary, but don't hurt.
294 if (rval == 0 && getuid() == 0 &&
295 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
296 if (fscanf(mountdfp, "%d", &pid) == 1 &&
297 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
298 err(1, "signal mountd");
306 ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize)
310 if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0')
311 /* the root file system can always be remounted */
314 for (i = mntsize - 1; i >= 0; --i)
315 if (strcmp(fs->fs_file, mntbuf[i].f_mntonname) == 0 &&
316 (!isremountable(fs->fs_vfstype) ||
317 strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0))
323 isremountable(const char *vfsname)
327 for (cp = remountable_fs_names; *cp; cp++)
328 if (strcmp(*cp, vfsname) == 0)
334 hasopt(const char *mntopts, const char *option)
339 if (option[0] == 'n' && option[1] == 'o') {
344 optbuf = xstrdup(mntopts);
346 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
347 if (opt[0] == 'n' && opt[1] == 'o') {
348 if (!strcasecmp(opt + 2, option))
350 } else if (!strcasecmp(opt, option))
358 mountfs(const char *vfstype, const char *spec, const char *name, int flags,
359 const char *options, const char *mntopts)
361 /* List of directories containing mount_xxx subcommands. */
362 static const char *edirs[] = {
367 const char *argv[100], **edir;
371 char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN];
378 /* resolve the mountpoint with realpath(3) */
379 checkpath(name, mntpath);
384 if (options == NULL) {
385 if (*mntopts == '\0') {
392 optbuf = catopt(xstrdup(mntopts), options);
394 if (strcmp(name, "/") == 0)
396 if (flags & MNT_FORCE)
397 optbuf = catopt(optbuf, "force");
398 if (flags & MNT_RDONLY)
399 optbuf = catopt(optbuf, "ro");
402 * The mount_mfs (newfs) command uses -o to select the
403 * optimization mode. We don't pass the default "-o rw"
406 if (flags & MNT_UPDATE)
407 optbuf = catopt(optbuf, "update");
410 argv[argc++] = vfstype;
411 mangle(optbuf, &argc, argv);
417 printf("exec: mount_%s", vfstype);
418 for (i = 1; i < argc; i++)
419 printf(" %s", argv[i]);
424 switch (pid = fork()) {
425 case -1: /* Error. */
430 if (strcmp(vfstype, "ufs") == 0)
431 exit(mount_ufs(argc, argv));
433 /* Go find an executable. */
434 for (edir = edirs; *edir; edir++) {
436 sizeof(execname), "%s/mount_%s", *edir, vfstype);
437 execv(execname, __DECONST(char * const *, argv));
439 if (errno == ENOENT) {
442 for (edir = edirs; *edir; edir++)
443 len += strlen(*edir) + 2; /* ", " */
444 if ((cp = malloc(len)) == NULL)
445 errx(1, "malloc failed");
447 for (edir = edirs; *edir; edir++) {
452 warn("exec mount_%s not found in %s", vfstype, cp);
456 default: /* Parent. */
459 if (waitpid(pid, &status, 0) < 0) {
464 if (WIFEXITED(status)) {
465 if (WEXITSTATUS(status) != 0)
466 return (WEXITSTATUS(status));
467 } else if (WIFSIGNALED(status)) {
468 warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]);
473 if (statfs(name, &sf) < 0) {
474 warn("statfs %s", name);
489 prmount(struct statfs *sfp)
495 printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname,
498 flags = sfp->f_flags & MNT_VISFLAGMASK;
499 for (o = optnames; flags && o->o_opt; o++)
500 if (flags & o->o_opt) {
501 printf(", %s", o->o_name);
505 printf(", mounted by ");
506 if ((pw = getpwuid(sfp->f_owner)) != NULL)
507 printf("%s", pw->pw_name);
509 printf("%d", sfp->f_owner);
512 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0)
513 printf(", writes: sync %ld async %ld",
514 sfp->f_syncwrites, sfp->f_asyncwrites);
515 if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0)
516 printf(", reads: sync %ld async %ld",
517 sfp->f_syncreads, sfp->f_asyncreads);
522 static struct statfs *
523 getmntpt(const char *name)
525 struct statfs *mntbuf;
528 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
529 for (i = mntsize - 1; i >= 0; i--) {
530 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
531 strcmp(mntbuf[i].f_mntonname, name) == 0)
538 catopt(char *s0, const char *s1)
543 if (s1 == NULL || *s1 == '\0')
547 i = strlen(s0) + strlen(s1) + 1 + 1;
548 if ((cp = malloc(i)) == NULL)
549 errx(1, "malloc failed");
550 snprintf(cp, i, "%s,%s", s0, s1);
560 mangle(char *options, int *argcp, const char **argv)
566 for (s = options; (p = strsep(&s, ",")) != NULL;)
575 } else if (strcmp(p, "rw") != 0) {
586 update_options(char *opts, char *fstab, int curflags)
590 char *expopt, *newopt, *tmpopt;
595 /* remove meta options from list */
596 remopt(fstab, MOUNT_META_OPTION_FSTAB);
597 remopt(fstab, MOUNT_META_OPTION_CURRENT);
598 cur = flags2opts(curflags);
601 * Expand all meta-options passed to us first.
604 for (p = opts; (o = strsep(&p, ",")) != NULL;) {
605 if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0)
606 expopt = catopt(expopt, fstab);
607 else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0)
608 expopt = catopt(expopt, cur);
610 expopt = catopt(expopt, o);
616 * Remove previous contradictory arguments. Given option "foo" we
617 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo"
618 * and "foo" - so we can deal with possible options like "notice".
621 for (p = expopt; (o = strsep(&p, ",")) != NULL;) {
622 if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL)
623 errx(1, "malloc failed");
625 strcpy(tmpopt, "no");
627 remopt(newopt, tmpopt);
630 if (strncmp("no", o, 2) == 0)
633 newopt = catopt(newopt, o);
641 remopt(char *string, const char *opt)
645 if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0')
650 for (p = string; (o = strsep(&p, ",")) != NULL;) {
651 if (strcmp(opt, o) != 0) {
652 if (*r == ',' && *o != '\0')
654 while ((*r++ = *o++) != '\0')
666 fprintf(stderr, "%s\n%s\n%s\n",
667 "usage: mount [-dfpruvw] [-o options] [-t ufs | external_type] special node",
668 " mount [-adfpruvw] [-o options] [-t ufs | external_type]",
669 " mount [-dfpruvw] special | node");
674 putfsent(const struct statfs *ent)
679 opts = flags2opts(ent->f_flags);
680 printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname,
681 ent->f_fstypename, opts);
684 if ((fst = getfsspec(ent->f_mntfromname)))
685 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
686 else if ((fst = getfsfile(ent->f_mntonname)))
687 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno);
688 else if (strcmp(ent->f_fstypename, "ufs") == 0) {
689 if (strcmp(ent->f_mntonname, "/") == 0)
699 flags2opts(int flags)
705 res = catopt(res, (flags & MNT_RDONLY) ? "ro" : "rw");
707 if (flags & MNT_SYNCHRONOUS) res = catopt(res, "sync");
708 if (flags & MNT_NOEXEC) res = catopt(res, "noexec");
709 if (flags & MNT_NOSUID) res = catopt(res, "nosuid");
710 if (flags & MNT_NODEV) res = catopt(res, "nodev");
711 if (flags & MNT_UNION) res = catopt(res, "union");
712 if (flags & MNT_ASYNC) res = catopt(res, "async");
713 if (flags & MNT_NOATIME) res = catopt(res, "noatime");
714 if (flags & MNT_NOCLUSTERR) res = catopt(res, "noclusterr");
715 if (flags & MNT_NOCLUSTERW) res = catopt(res, "noclusterw");
716 if (flags & MNT_NOSYMFOLLOW) res = catopt(res, "nosymfollow");
717 if (flags & MNT_SUIDDIR) res = catopt(res, "suiddir");
723 xstrdup(const char *str)
725 char* ret = strdup(str);
727 errx(1, "strdup failed (could not allocate memory)");