1 /* vi: set sw=4 ts=4: */
3 * Mini mount implementation for busybox
5 * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
6 * Copyright (C) 1999-2003 by Erik Andersen <andersen@codepoet.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * 3/21/1999 Charles P. Wright <cpwright@cpwright.com>
23 * searches through fstab when -a is passed
24 * will try mounting stuff with all fses when passed -t auto
26 * 1999-04-17 Dave Cinege...Rewrote -t auto. Fixed ro mtab.
28 * 1999-10-07 Erik Andersen <andersen@codepoet.org>.
29 * Rewrite of a lot of code. Removed mtab usage (I plan on
30 * putting it back as a compile-time option some time),
31 * major adjustments to option parsing, and some serious
34 * 1999-11-06 mtab suppport is back - andersee
36 * 2000-01-12 Ben Collins <bcollins@debian.org>, Borrowed utils-linux's
37 * mount to add loop support.
39 * 2000-04-30 Dave Cinege <dcinege@psychosis.com>
40 * Rewrote fstab while loop and lower mount section. Can now do
41 * single mounts from fstab. Can override fstab options for single
42 * mount. Common mount_one call for single mounts and 'all'. Fixed
43 * mtab updating and stale entries. Removed 'remount' default.
57 #ifdef CONFIG_NFSMOUNT
58 #if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
59 #error "You need to build uClibc with UCLIBC_HAS_RPC for busybox mount with NFS support to compile."
64 MS_MGC_VAL = 0xc0ed0000, /* Magic number indicatng "new" flags */
65 MS_RDONLY = 1, /* Mount read-only */
66 MS_NOSUID = 2, /* Ignore suid and sgid bits */
67 MS_NODEV = 4, /* Disallow access to device special files */
68 MS_NOEXEC = 8, /* Disallow program execution */
69 MS_SYNCHRONOUS = 16, /* Writes are synced at once */
70 MS_REMOUNT = 32, /* Alter flags of a mounted FS */
71 MS_MANDLOCK = 64, /* Allow mandatory locks on an FS */
72 S_QUOTA = 128, /* Quota initialized for file/directory/symlink */
73 S_APPEND = 256, /* Append-only file */
74 S_IMMUTABLE = 512, /* Immutable file */
75 MS_NOATIME = 1024, /* Do not update access times. */
76 MS_NODIRATIME = 2048, /* Do not update directory access times */
77 MS_BIND = 4096, /* Use the new linux 2.4.x "mount --bind" feature */
81 #if defined CONFIG_FEATURE_MOUNT_LOOP
83 #include <sys/ioctl.h>
84 static int use_loop = FALSE;
87 extern int mount(__const char *__special_file, __const char *__dir,
88 __const char *__fstype, unsigned long int __rwflag,
89 __const void *__data);
90 extern int umount(__const char *__special_file);
91 extern int umount2(__const char *__special_file, int __flags);
93 extern int sysfs(int option, unsigned int fs_index, char *buf);
95 struct mount_options {
101 static const struct mount_options mount_options[] = {
102 {"async", ~MS_SYNCHRONOUS, 0},
103 {"atime", ~0, ~MS_NOATIME},
106 {"dev", ~MS_NODEV, 0},
107 {"diratime", ~0, ~MS_NODIRATIME},
108 {"exec", ~MS_NOEXEC, 0},
109 {"noatime", ~0, MS_NOATIME},
110 {"nodev", ~0, MS_NODEV},
111 {"nodiratime", ~0, MS_NODIRATIME},
112 {"noexec", ~0, MS_NOEXEC},
113 {"nosuid", ~0, MS_NOSUID},
114 {"remount", ~0, MS_REMOUNT},
115 {"ro", ~0, MS_RDONLY},
116 {"rw", ~MS_RDONLY, 0},
117 {"suid", ~MS_NOSUID, 0},
118 {"sync", ~0, MS_SYNCHRONOUS},
119 {"bind", ~0, MS_BIND},
124 do_mount(char *specialfile, char *dir, char *filesystemtype, long flags,
125 void *string_flags, int useMtab, int fakeIt, char *mtab_opts,
130 #if defined CONFIG_FEATURE_MOUNT_LOOP
135 #if defined CONFIG_FEATURE_MOUNT_LOOP
136 if (use_loop == TRUE) {
137 int loro = flags & MS_RDONLY;
139 lofile = specialfile;
141 specialfile = find_unused_loop_device();
142 if (specialfile == NULL) {
143 bb_error_msg_and_die("Could not find a spare loop device");
145 if (set_loop(specialfile, lofile, 0, &loro)) {
146 bb_error_msg_and_die("Could not setup loop device");
148 if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
149 bb_error_msg("WARNING: loop device is read-only");
154 status = mount(specialfile, dir, filesystemtype, flags, string_flags);
155 if (status < 0 && errno == EROFS) {
156 bb_error_msg("%s is write-protected, mounting read-only",
158 status = mount(specialfile, dir, filesystemtype, flags |=
159 MS_RDONLY, string_flags);
161 /* Don't whine about already mounted filesystems when mounting all. */
162 if (status < 0 && errno == EBUSY && mount_all) {
168 /* If the mount was sucessful, do anything needed, then return TRUE */
169 if (status == 0 || fakeIt == TRUE) {
171 #if defined CONFIG_FEATURE_MTAB_SUPPORT
173 erase_mtab(specialfile); /* Clean any stale entries */
174 write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
180 /* Bummer. mount failed. Clean up */
181 #if defined CONFIG_FEATURE_MOUNT_LOOP
182 if (lofile != NULL) {
183 del_loop(specialfile);
187 if (errno == EPERM) {
188 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
195 static void paste_str(char **s1, const char *s2)
197 *s1 = xrealloc(*s1, strlen(*s1) + strlen(s2) + 1);
201 /* Seperate standard mount options from the nonstandard string options */
202 static void parse_mount_options(char *options, int *flags, char **strflags)
206 char *comma = strchr(options, ',');
207 const struct mount_options *f = mount_options;
213 while (f->name != 0) {
214 if (strcasecmp(f->name, options) == 0) {
223 #if defined CONFIG_FEATURE_MOUNT_LOOP
224 if (!strcasecmp("loop", options)) { /* loop device support */
231 /* have previous parsed options */
232 paste_str(strflags, ",");
234 paste_str(strflags, options);
245 static int mount_one(char *blockDevice, char *directory, char *filesystemType,
246 unsigned long flags, char *string_flags, int useMtab,
247 int fakeIt, char *mtab_opts, int whineOnErrors,
251 if (strcmp(filesystemType, "auto") == 0) {
256 f = fopen("/etc/filesystems", "r");
259 while (fgets(buf, sizeof(buf), f)) {
262 } else if (*buf == '#') {
265 filesystemType = buf;
267 /* Add NULL termination to each line */
268 while (*filesystemType && !isspace(*filesystemType)) {
271 *filesystemType = '\0';
273 filesystemType = buf;
275 if (bb_strlen(filesystemType)) {
277 do_mount(blockDevice, directory, filesystemType,
278 flags | MS_MGC_VAL, string_flags,
279 useMtab, fakeIt, mtab_opts, mount_all);
290 if ((!f || read_proc) && !status) {
291 f = bb_xfopen("/proc/filesystems", "r");
293 while (fgets(buf, sizeof(buf), f) != NULL) {
294 filesystemType = buf;
295 if (*filesystemType == '\t') { /* Not a nodev filesystem */
297 /* Add NULL termination to each line */
298 while (*filesystemType && *filesystemType != '\n') {
301 *filesystemType = '\0';
303 filesystemType = buf;
304 filesystemType++; /* hop past tab */
307 do_mount(blockDevice, directory, filesystemType,
308 flags | MS_MGC_VAL, string_flags, useMtab,
309 fakeIt, mtab_opts, mount_all);
319 do_mount(blockDevice, directory, filesystemType,
320 flags | MS_MGC_VAL, string_flags, useMtab, fakeIt,
321 mtab_opts, mount_all);
326 bb_perror_msg("Mounting %s on %s failed", blockDevice, directory);
333 static void show_mounts(char *onlytype)
335 FILE *mountTable = setmntent(bb_path_mtab_file, "r");
340 while ((m = getmntent(mountTable)) != 0) {
341 char *blockDevice = m->mnt_fsname;
343 if (strcmp(blockDevice, "rootfs") == 0) {
345 } else if (strcmp(blockDevice, "/dev/root") == 0) {
346 blockDevice = find_real_root_device_name(blockDevice);
348 if (!onlytype || (strcmp(m->mnt_type, onlytype) == 0)) {
349 printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
350 m->mnt_type, m->mnt_opts);
352 #ifdef CONFIG_FEATURE_CLEAN_UP
353 if (blockDevice != m->mnt_fsname) {
358 endmntent(mountTable);
360 bb_perror_msg_and_die(bb_path_mtab_file);
365 extern int mount_main(int argc, char **argv)
368 char *string_flags = bb_xstrdup("");
371 char *filesystemType = "auto";
372 int got_filesystemType = 0;
373 char *device = xmalloc(PATH_MAX);
374 char *directory = xmalloc(PATH_MAX);
375 struct mntent *m = NULL;
379 int rc = EXIT_FAILURE;
384 while ((opt = getopt(argc, argv, "o:rt:wafnv")) > 0) {
387 parse_mount_options(optarg, &flags, &string_flags);
393 filesystemType = optarg;
394 got_filesystemType = 1;
405 #ifdef CONFIG_FEATURE_MTAB_SUPPORT
411 break; /* ignore -v */
415 if (!all && (optind == argc)) {
416 show_mounts(got_filesystemType ? filesystemType : NULL);
420 /* if device is a filename get its real path */
421 if (stat(argv[optind], &statbuf) == 0) {
422 char *tmp = bb_simplify_path(argv[optind]);
424 safe_strncpy(device, tmp, PATH_MAX);
426 safe_strncpy(device, argv[optind], PATH_MAX);
430 if (optind + 1 < argc)
431 directory = bb_simplify_path(argv[optind + 1]);
433 if (all || optind + 1 == argc) {
434 f = setmntent("/etc/fstab", "r");
437 bb_perror_msg_and_die("\nCannot read /etc/fstab");
439 while ((m = getmntent(f)) != NULL) {
440 if (!all && (optind + 1 == argc)
441 && ((strcmp(device, m->mnt_fsname) != 0)
442 && (strcmp(device, m->mnt_dir) != 0))) {
446 if (all && ( /* If we're mounting 'all' */
447 (strstr(m->mnt_opts, "noauto")) || /* and the file system isn't noauto, */
448 (strstr(m->mnt_type, "swap")))) /* and isn't swap, then mount it */
453 if (all || flags == 0) { /* Allow single mount to override fstab flags */
456 parse_mount_options(m->mnt_opts, &flags, &string_flags);
459 strcpy(device, m->mnt_fsname);
460 strcpy(directory, m->mnt_dir);
461 filesystemType = bb_xstrdup(m->mnt_type);
463 extra_opts = string_flags;
465 #ifdef CONFIG_NFSMOUNT
466 if (strchr(device, ':') != NULL) {
467 filesystemType = "nfs";
469 (device, directory, &flags, &extra_opts, &string_flags,
471 bb_perror_msg("nfsmount failed");
477 (device, directory, filesystemType, flags, string_flags,
478 useMtab, fakeIt, extra_opts, TRUE, all)) {
488 if (!all && f && m == NULL) {
489 fprintf(stderr, "Can't find %s in /etc/fstab\n", device);