2 * mount.c -- Linux NFS mount
4 * Copyright (C) 2006 Amit Gud <agud@redhat.com>
6 * - Basic code and wrapper around mount and umount code of NFS.
7 * Based on util-linux/mount/mount.c.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2, or (at your option)
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
26 #include <sys/types.h>
32 #include <sys/mount.h>
40 #include "mount_constants.h"
41 #include "mount_config.h"
42 #include "nfs_paths.h"
43 #include "nfs_mntent.h"
45 #include "nfs_mount.h"
46 #include "nfs4_mount.h"
53 int nfs_mount_data_version;
59 #define FOREGROUND (0)
60 #define BACKGROUND (1)
62 static struct option longopts[] = {
63 { "fake", 0, 0, 'f' },
64 { "help", 0, 0, 'h' },
65 { "no-mtab", 0, 0, 'n' },
66 { "read-only", 0, 0, 'r' },
68 { "verbose", 0, 0, 'v' },
69 { "version", 0, 0, 'V' },
70 { "read-write", 0, 0, 'w' },
72 { "options", 1, 0, 'o' },
77 * Map from -o and fstab option strings to the flag argument to mount(2).
80 const char *opt; /* option name */
81 int skip; /* skip in mtab option string */
82 int inv; /* true if flag value should be inverted */
83 int mask; /* flag mask value */
86 static const struct opt_map opt_map[] = {
87 { "defaults", 0, 0, 0 }, /* default options */
88 { "ro", 1, 0, MS_RDONLY }, /* read-only */
89 { "rw", 1, 1, MS_RDONLY }, /* read-write */
90 { "exec", 0, 1, MS_NOEXEC }, /* permit execution of binaries */
91 { "noexec", 0, 0, MS_NOEXEC }, /* don't execute binaries */
92 { "suid", 0, 1, MS_NOSUID }, /* honor suid executables */
93 { "nosuid", 0, 0, MS_NOSUID }, /* don't honor suid executables */
94 { "dev", 0, 1, MS_NODEV }, /* interpret device files */
95 { "nodev", 0, 0, MS_NODEV }, /* don't interpret devices */
96 { "sync", 0, 0, MS_SYNCHRONOUS}, /* synchronous I/O */
97 { "async", 0, 1, MS_SYNCHRONOUS}, /* asynchronous I/O */
98 { "dirsync", 0, 0, MS_DIRSYNC}, /* synchronous directory modifications */
99 { "remount", 0, 0, MS_REMOUNT}, /* Alter flags of mounted FS */
100 { "bind", 0, 0, MS_BIND }, /* Remount part of tree elsewhere */
101 { "rbind", 0, 0, MS_BIND|MS_REC }, /* Idem, plus mounted subtrees */
102 { "auto", 0, 0, MS_DUMMY }, /* Can be mounted using -a */
103 { "noauto", 0, 0, MS_DUMMY }, /* Can only be mounted explicitly */
104 { "users", 1, 0, MS_USERS }, /* Allow ordinary user to mount */
105 { "nousers", 0, 1, MS_DUMMY }, /* Forbid ordinary user to mount */
106 { "user", 1, 0, MS_USER }, /* Allow ordinary user to mount */
107 { "nouser", 0, 1, MS_DUMMY }, /* Forbid ordinary user to mount */
108 { "owner", 0, 0, MS_DUMMY }, /* Let the owner of the device mount */
109 { "noowner", 0, 0, MS_DUMMY }, /* Device owner has no special privs */
110 { "group", 0, 0, MS_DUMMY }, /* Let the group of the device mount */
111 { "nogroup", 0, 0, MS_DUMMY }, /* Device group has no special privs */
112 { "_netdev", 0, 0, MS_DUMMY}, /* Device requires network */
113 { "comment", 0, 0, MS_DUMMY}, /* fstab comment only (kudzu,_netdev)*/
115 /* add new options here */
117 { "sub", 0, 1, MS_NOSUB }, /* allow submounts */
118 { "nosub", 0, 0, MS_NOSUB }, /* don't allow submounts */
121 { "quiet", 0, 0, MS_SILENT }, /* be quiet */
122 { "loud", 0, 1, MS_SILENT }, /* print out messages. */
125 { "mand", 0, 0, MS_MANDLOCK }, /* Allow mandatory locks on this FS */
126 { "nomand", 0, 1, MS_MANDLOCK }, /* Forbid mandatory locks on this FS */
128 { "loop", 1, 0, MS_DUMMY }, /* use a loop device */
130 { "atime", 0, 1, MS_NOATIME }, /* Update access time */
131 { "noatime", 0, 0, MS_NOATIME }, /* Do not update access time */
134 { "diratime", 0, 1, MS_NODIRATIME }, /* Update dir access times */
135 { "nodiratime", 0, 0, MS_NODIRATIME },/* Do not update dir access times */
138 { "relatime", 0, 0, MS_RELATIME }, /* Update access times relative to
140 { "norelatime", 0, 1, MS_RELATIME }, /* Update access time without regard
143 { "noquota", 0, 0, MS_DUMMY }, /* Don't enforce quota */
144 { "quota", 0, 0, MS_DUMMY }, /* Enforce user quota */
145 { "usrquota", 0, 0, MS_DUMMY }, /* Enforce user quota */
146 { "grpquota", 0, 0, MS_DUMMY }, /* Enforce group quota */
150 static void parse_opts(const char *options, int *flags, char **extra_opts);
153 * Choose the version of the nfs_mount_data structure that is appropriate
154 * for the kernel that is doing the mount.
156 * NFS_MOUNT_VERSION: maximum version supported by these sources
157 * nfs_mount_data_version: maximum version supported by the running kernel
159 static void discover_nfs_mount_data_version(void)
161 unsigned int kernel_version = linux_version_code();
163 if (kernel_version) {
164 if (kernel_version < MAKE_VERSION(2, 1, 32))
165 nfs_mount_data_version = 1;
166 else if (kernel_version < MAKE_VERSION(2, 2, 18))
167 nfs_mount_data_version = 3;
168 else if (kernel_version < MAKE_VERSION(2, 3, 0))
169 nfs_mount_data_version = 4;
170 else if (kernel_version < MAKE_VERSION(2, 3, 99))
171 nfs_mount_data_version = 3;
172 else if (kernel_version < MAKE_VERSION(2, 6, 3))
173 nfs_mount_data_version = 4;
175 nfs_mount_data_version = 6;
177 if (nfs_mount_data_version > NFS_MOUNT_VERSION)
178 nfs_mount_data_version = NFS_MOUNT_VERSION;
180 if (kernel_version > MAKE_VERSION(2, 6, 22))
184 static void print_one(char *spec, char *node, char *type, char *opts)
190 printf(_("%s on %s type %s (%s)\n"), spec, node, type, opts);
192 printf(_("%s on %s type %s\n"), spec, node, type);
196 * Build a canonical mount option string for /etc/mtab.
198 static char *fix_opts_string(int flags, const char *extra_opts)
200 const struct opt_map *om;
203 new_opts = xstrdup((flags & MS_RDONLY) ? "ro" : "rw");
204 if (flags & MS_USER) {
205 /* record who mounted this so they can unmount */
206 struct passwd *pw = getpwuid(getuid());
208 new_opts = xstrconcat3(new_opts, ",user=", pw->pw_name);
210 if (flags & MS_USERS)
211 new_opts = xstrconcat3(new_opts, ",users", "");
213 for (om = opt_map; om->opt != NULL; om++) {
216 if (om->inv || !om->mask || (flags & om->mask) != om->mask)
218 new_opts = xstrconcat3(new_opts, ",", om->opt);
221 if (extra_opts && *extra_opts) {
222 new_opts = xstrconcat3(new_opts, ",", extra_opts);
227 /* Create mtab with a root entry. */
230 struct mntentchn *fstab;
237 mfp = nfs_setmntent (MOUNTED, "a+");
238 if (mfp == NULL || mfp->mntent_fp == NULL) {
240 die (EX_FILEIO, _("mount: can't open %s for writing: %s"),
241 MOUNTED, strerror (errsv));
244 /* Find the root entry by looking it up in fstab */
245 if ((fstab = getfsfile ("/")) || (fstab = getfsfile ("root"))) {
247 parse_opts (fstab->m.mnt_opts, &flags, &extra_opts);
249 mnt.mnt_fsname = xstrdup(fstab->m.mnt_fsname);
250 mnt.mnt_type = fstab->m.mnt_type;
251 mnt.mnt_opts = fix_opts_string (flags, extra_opts);
252 mnt.mnt_freq = mnt.mnt_passno = 0;
255 if (nfs_addmntent (mfp, &mnt) == 1) {
257 die (EX_FILEIO, _("mount: error writing %s: %s"),
258 _PATH_MOUNTED, strerror (errsv));
261 if (fchmod (fileno (mfp->mntent_fp), 0644) < 0)
262 if (errno != EROFS) {
265 _("mount: error changing mode of %s: %s"),
266 _PATH_MOUNTED, strerror (errsv));
275 static int add_mtab(char *spec, char *mount_point, char *fstype,
276 int flags, char *opts, int freq, int pass)
279 int result = EX_SUCCESS;
281 ment.mnt_fsname = spec;
282 ment.mnt_dir = mount_point;
283 ment.mnt_type = fstype;
284 ment.mnt_opts = fix_opts_string(flags, opts);
285 ment.mnt_freq = freq;
286 ment.mnt_passno = pass;
288 if (!nomtab && mtab_does_not_exist()) {
290 printf(_("mount: no %s found - creating it..\n"),
295 if (!nomtab && mtab_is_writable()) {
296 if (flags & MS_REMOUNT)
297 update_mtab(ment.mnt_dir, &ment);
302 mtab = nfs_setmntent(MOUNTED, "a+");
303 if (mtab == NULL || mtab->mntent_fp == NULL) {
304 nfs_error(_("Can't open mtab: %s"),
308 if (nfs_addmntent(mtab, &ment) == 1) {
309 nfs_error(_("Can't write mount entry to mtab: %s"),
324 void mount_usage(void)
326 printf(_("usage: %s remotetarget dir [-rvVwfnsih] [-o nfsoptions]\n"),
328 printf(_("options:\n"));
329 printf(_("\t-r\t\tMount file system readonly\n"));
330 printf(_("\t-v\t\tVerbose\n"));
331 printf(_("\t-V\t\tPrint version\n"));
332 printf(_("\t-w\t\tMount file system read-write\n"));
333 printf(_("\t-f\t\tFake mount, do not actually mount\n"));
334 printf(_("\t-n\t\tDo not update /etc/mtab\n"));
335 printf(_("\t-s\t\tTolerate sloppy mount options rather than fail\n"));
336 printf(_("\t-h\t\tPrint this help\n"));
337 printf(_("\tnfsoptions\tRefer to mount.nfs(8) or nfs(5)\n\n"));
340 static void parse_opt(const char *opt, int *mask, char *extra_opts, int len)
342 const struct opt_map *om;
344 for (om = opt_map; om->opt != NULL; om++) {
345 if (!strcmp (opt, om->opt)) {
354 len -= strlen(extra_opts);
356 if (*extra_opts && --len > 0)
357 strcat(extra_opts, ",");
359 if ((len -= strlen(opt)) > 0)
360 strcat(extra_opts, opt);
364 * Convert the provided mount command-line options into the 4th &
365 * 5th arguments to mount(2). Output parameter "@flags" gets the
366 * standard options (indicated by MS_ bits), and output parameter
367 * "@extra_opts" gets all the filesystem-specific options.
369 static void parse_opts(const char *options, int *flags, char **extra_opts)
371 if (options != NULL) {
372 char *opts = xstrdup(options);
374 int len = strlen(opts) + 1; /* include room for a null */
377 *extra_opts = xmalloc(len);
380 for (p = opts, opt = NULL; p && *p; p++) {
382 opt = p; /* begin of the option item */
384 open_quote ^= 1; /* reverse the status */
386 continue; /* still in a quoted block */
388 *p = '\0'; /* terminate the option item */
390 /* end of option item or last item */
391 if (*p == '\0' || *(p + 1) == '\0') {
392 parse_opt(opt, flags, *extra_opts, len);
400 static int chk_mountpoint(char *mount_point)
404 if (stat(mount_point, &sb) < 0){
405 mount_error(NULL, mount_point, errno);
408 if (S_ISDIR(sb.st_mode) == 0){
409 mount_error(NULL, mount_point, ENOTDIR);
412 if (access(mount_point, X_OK) < 0) {
413 mount_error(NULL, mount_point, errno);
420 static int try_mount(char *spec, char *mount_point, int flags,
421 char *fs_type, char **extra_opts, char *mount_opts,
427 ret = nfsmount_string(spec, mount_point, fs_type, flags,
428 extra_opts, fake, bg);
430 if (strcmp(fs_type, "nfs4") == 0)
431 ret = nfs4mount(spec, mount_point, flags,
432 extra_opts, fake, bg);
434 ret = nfsmount(spec, mount_point, flags,
435 extra_opts, fake, bg);
442 print_one(spec, mount_point, fs_type, mount_opts);
444 ret = add_mtab(spec, mount_point, fs_type, flags, *extra_opts,
445 0, 0 /* these are always zero for NFS */ );
449 int main(int argc, char *argv[])
451 int c, flags = 0, mnt_err = 1, fake = 0;
452 char *spec, *mount_point, *fs_type = "nfs";
453 char *extra_opts = NULL, *mount_opts = NULL;
454 uid_t uid = getuid();
456 progname = basename(argv[0]);
458 discover_nfs_mount_data_version();
460 if(!strncmp(progname, "umount", strlen("umount")))
461 exit(nfsumount(argc, argv));
463 if (argv[1] && argv[1][0] == '-') {
464 if(argv[1][1] == 'V')
465 printf("%s ("PACKAGE_STRING")\n", progname);
477 mount_point = argv[2];
479 mount_config_init(progname);
481 argv[2] = argv[0]; /* so that getopt error messages are correct */
482 while ((c = getopt_long(argc - 2, argv + 2, "rvVwfno:hs",
483 longopts, NULL)) != -1) {
492 printf("%s: ("PACKAGE_STRING")\n", progname);
503 case 'o': /* specify mount options */
505 mount_opts = xstrconcat3(mount_opts, ",", optarg);
507 mount_opts = xstrdup(optarg);
520 * Extra non-option words at the end are bogus...
522 if (optind != argc - 2) {
527 if (strcmp(progname, "mount.nfs4") == 0)
531 * If a non-root user is attempting to mount, make sure the
532 * user's requested options match the options specified in
533 * /etc/fstab; otherwise, don't allow the mount.
536 struct mntentchn *mc;
538 if ((mc = getfsfile(mount_point)) == NULL ||
539 strcmp(mc->m.mnt_fsname, spec) != 0 ||
540 strcmp(mc->m.mnt_type, fs_type) != 0) {
541 nfs_error(_("%s: permission denied: no match for %s "
542 "found in /etc/fstab"), progname, mount_point);
547 * 'mount' munges the options from fstab before passing them
548 * to us, so it is non-trivial to test that we have the correct
549 * set of options and we don't want to trust what the user
550 * gave us, so just take whatever is in /etc/fstab.
552 mount_opts = strdup(mc->m.mnt_opts);
555 mount_point = canonicalize(mount_point);
557 nfs_error(_("%s: no mount point provided"), progname);
560 if (mount_point[0] != '/') {
561 nfs_error(_("%s: unrecognized mount point %s"),
562 progname, mount_point);
567 * Concatenate mount options from the configuration file
569 mount_opts = mount_config_opts(spec, mount_point, mount_opts);
571 parse_opts(mount_opts, &flags, &extra_opts);
574 if (!(flags & (MS_USERS|MS_USER))) {
575 nfs_error(_("%s: permission denied"), progname);
580 if (geteuid() != 0) {
581 nfs_error(_("%s: not installed setuid - "
582 "\"user\" NFS mounts not supported."), progname);
587 if (chk_mountpoint(mount_point)) {
592 mnt_err = try_mount(spec, mount_point, flags, fs_type, &extra_opts,
593 mount_opts, fake, FOREGROUND);
594 if (mnt_err == EX_BG) {
595 printf(_("%s: backgrounding \"%s\"\n"),
597 printf(_("%s: mount options: \"%s\"\n"),
598 progname, extra_opts);
603 * Parent exits immediately with success.
606 nfs_error(_("%s: failed to start "
607 "background process: %s\n"),
608 progname, strerror(errno));
612 mnt_err = try_mount(spec, mount_point, flags, fs_type,
613 &extra_opts, mount_opts, fake,
615 if (verbose && mnt_err)
616 printf(_("%s: giving up \"%s\"\n"),