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) 1999-2002 by Erik Andersen <andersee@debian.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@lineo.com>, <andersee@debian.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.
56 #if defined CONFIG_FEATURE_USE_DEVPS_PATCH
57 # include <linux/devmtab.h> /* For Erik's nifty devmtab device driver */
61 MS_MGC_VAL = 0xc0ed0000, /* Magic number indicatng "new" flags */
62 MS_RDONLY = 1, /* Mount read-only */
63 MS_NOSUID = 2, /* Ignore suid and sgid bits */
64 MS_NODEV = 4, /* Disallow access to device special files */
65 MS_NOEXEC = 8, /* Disallow program execution */
66 MS_SYNCHRONOUS = 16, /* Writes are synced at once */
67 MS_REMOUNT = 32, /* Alter flags of a mounted FS */
68 MS_MANDLOCK = 64, /* Allow mandatory locks on an FS */
69 S_QUOTA = 128, /* Quota initialized for file/directory/symlink */
70 S_APPEND = 256, /* Append-only file */
71 S_IMMUTABLE = 512, /* Immutable file */
72 MS_NOATIME = 1024, /* Do not update access times. */
73 MS_NODIRATIME = 2048, /* Do not update directory access times */
74 MS_BIND = 4096, /* Use the new linux 2.4.x "mount --bind" feature */
78 #if defined CONFIG_FEATURE_MOUNT_LOOP
80 #include <sys/ioctl.h>
81 static int use_loop = FALSE;
84 extern int mount (__const char *__special_file, __const char *__dir,
85 __const char *__fstype, unsigned long int __rwflag,
86 __const void *__data);
87 extern int umount (__const char *__special_file);
88 extern int umount2 (__const char *__special_file, int __flags);
90 extern int sysfs( int option, unsigned int fs_index, char * buf);
92 extern const char mtab_file[]; /* Defined in utility.c */
94 struct mount_options {
100 static const struct mount_options mount_options[] = {
101 {"async", ~MS_SYNCHRONOUS, 0},
102 {"atime", ~0, ~MS_NOATIME},
105 {"dev", ~MS_NODEV, 0},
106 {"diratime", ~0, ~MS_NODIRATIME},
107 {"exec", ~MS_NOEXEC, 0},
108 {"noatime", ~0, MS_NOATIME},
109 {"nodev", ~0, MS_NODEV},
110 {"nodiratime", ~0, MS_NODIRATIME},
111 {"noexec", ~0, MS_NOEXEC},
112 {"nosuid", ~0, MS_NOSUID},
113 {"remount", ~0, MS_REMOUNT},
114 {"ro", ~0, MS_RDONLY},
115 {"rw", ~MS_RDONLY, 0},
116 {"suid", ~MS_NOSUID, 0},
117 {"sync", ~0, MS_SYNCHRONOUS},
118 {"bind", ~0, MS_BIND},
123 do_mount(char *specialfile, char *dir, char *filesystemtype,
124 long flags, void *string_flags, int useMtab, int fakeIt,
125 char *mtab_opts, int mount_all)
128 #if defined CONFIG_FEATURE_MOUNT_LOOP
134 #if defined CONFIG_FEATURE_MOUNT_LOOP
135 if (use_loop==TRUE) {
136 int loro = flags & MS_RDONLY;
138 lofile = specialfile;
140 specialfile = find_unused_loop_device();
141 if (specialfile == NULL) {
142 error_msg_and_die("Could not find a spare loop device");
144 if (set_loop(specialfile, lofile, 0, &loro)) {
145 error_msg_and_die("Could not setup loop device");
147 if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
148 error_msg("WARNING: loop device is read-only");
153 status = mount(specialfile, dir, filesystemtype, flags, string_flags);
154 if (status < 0 && errno == EROFS) {
155 error_msg("%s is write-protected, mounting read-only", specialfile);
156 status = mount(specialfile, dir, filesystemtype, flags |= MS_RDONLY, string_flags);
158 /* Don't whine about already mounted filesystems when mounting all. */
159 if (status < 0 && errno == EBUSY && mount_all)
164 /* If the mount was sucessful, do anything needed, then return TRUE */
165 if (status == 0 || fakeIt==TRUE) {
167 #if defined CONFIG_FEATURE_MTAB_SUPPORT
169 erase_mtab(specialfile); // Clean any stale entries
170 write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
176 /* Bummer. mount failed. Clean up */
177 #if defined CONFIG_FEATURE_MOUNT_LOOP
178 if (lofile != NULL) {
179 del_loop(specialfile);
183 if (errno == EPERM) {
184 error_msg_and_die("permission denied. Are you root?");
191 static void paste_str(char **s1, const char *s2)
193 *s1 = xrealloc(*s1, strlen(*s1)+strlen(s2)+1);
197 /* Seperate standard mount options from the nonstandard string options */
199 parse_mount_options(char *options, int *flags, char **strflags)
203 char *comma = strchr(options, ',');
204 const struct mount_options *f = mount_options;
209 while (f->name != 0) {
210 if (strcasecmp(f->name, options) == 0) {
219 #if defined CONFIG_FEATURE_MOUNT_LOOP
220 if (!strcasecmp("loop", options)) { /* loop device support */
226 if (**strflags) /* have previous parsed options */
227 paste_str(strflags, ",");
228 paste_str(strflags, options);
240 mount_one(char *blockDevice, char *directory, char *filesystemType,
241 unsigned long flags, char *string_flags, int useMtab, int fakeIt,
242 char *mtab_opts, int whineOnErrors, int mount_all)
246 #if defined CONFIG_FEATURE_USE_DEVPS_PATCH
247 if (strcmp(filesystemType, "auto") == 0) {
248 static const char *noauto_array[] = { "tmpfs", "shm", "proc", "ramfs", "devpts", "devfs", "usbdevfs", 0 };
249 const char **noauto_fstype;
250 const int num_of_filesystems = sysfs(3, 0, 0);
256 while(i < num_of_filesystems) {
257 sysfs(2, i++, filesystemType);
258 for (noauto_fstype = noauto_array; *noauto_fstype; noauto_fstype++) {
259 if (!strcmp(filesystemType, *noauto_fstype)) {
263 if (!*noauto_fstype) {
264 status = do_mount(blockDevice, directory, filesystemType,
265 flags | MS_MGC_VAL, string_flags,
266 useMtab, fakeIt, mtab_opts, mount_all);
273 if (strcmp(filesystemType, "auto") == 0) {
275 FILE *f = xfopen("/proc/filesystems", "r");
277 while (fgets(buf, sizeof(buf), f) != NULL) {
278 filesystemType = buf;
279 if (*filesystemType == '\t') { // Not a nodev filesystem
281 // Add NULL termination to each line
282 while (*filesystemType && *filesystemType != '\n')
284 *filesystemType = '\0';
286 filesystemType = buf;
287 filesystemType++; // hop past tab
289 status = do_mount(blockDevice, directory, filesystemType,
290 flags | MS_MGC_VAL, string_flags,
291 useMtab, fakeIt, mtab_opts, mount_all);
300 status = do_mount(blockDevice, directory, filesystemType,
301 flags | MS_MGC_VAL, string_flags, useMtab,
302 fakeIt, mtab_opts, mount_all);
307 perror_msg("Mounting %s on %s failed", blockDevice, directory);
314 static void show_mounts(void)
316 #if defined CONFIG_FEATURE_USE_DEVPS_PATCH
317 int fd, i, numfilesystems;
318 char device[] = "/dev/mtab";
319 struct k_mntent *mntentlist;
322 fd = open(device, O_RDONLY);
324 perror_msg_and_die("open failed for `%s'", device);
326 /* How many mounted filesystems? We need to know to
327 * allocate enough space for later... */
328 numfilesystems = ioctl (fd, DEVMTAB_COUNT_MOUNTS);
329 if (numfilesystems<0)
330 perror_msg_and_die( "\nDEVMTAB_COUNT_MOUNTS");
331 mntentlist = (struct k_mntent *) xcalloc ( numfilesystems, sizeof(struct k_mntent));
333 /* Grab the list of mounted filesystems */
334 if (ioctl (fd, DEVMTAB_GET_MOUNTS, mntentlist)<0)
335 perror_msg_and_die( "\nDEVMTAB_GET_MOUNTS");
337 for( i = 0 ; i < numfilesystems ; i++) {
338 printf( "%s %s %s %s %d %d\n", mntentlist[i].mnt_fsname,
339 mntentlist[i].mnt_dir, mntentlist[i].mnt_type,
340 mntentlist[i].mnt_opts, mntentlist[i].mnt_freq,
341 mntentlist[i].mnt_passno);
343 #ifdef CONFIG_FEATURE_CLEAN_UP
344 /* Don't bother to close files or free memory. Exit
345 * does that automagically, so we can save a few bytes */
351 FILE *mountTable = setmntent(mtab_file, "r");
356 while ((m = getmntent(mountTable)) != 0) {
357 char *blockDevice = m->mnt_fsname;
358 if (strcmp(blockDevice, "/dev/root") == 0) {
359 blockDevice = find_real_root_device_name(blockDevice);
361 printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
362 m->mnt_type, m->mnt_opts);
363 #ifdef CONFIG_FEATURE_CLEAN_UP
364 if(blockDevice != m->mnt_fsname)
368 endmntent(mountTable);
370 perror_msg_and_die("%s", mtab_file);
376 extern int mount_main(int argc, char **argv)
379 char *string_flags = xstrdup("");
382 char *filesystemType = "auto";
383 char *device = xmalloc(PATH_MAX);
384 char *directory = xmalloc(PATH_MAX);
385 struct mntent *m = NULL;
389 int rc = EXIT_FAILURE;
394 while ((opt = getopt(argc, argv, "o:rt:wafnv")) > 0) {
397 parse_mount_options(optarg, &flags, &string_flags);
403 filesystemType = optarg;
414 #ifdef CONFIG_FEATURE_MTAB_SUPPORT
420 break; /* ignore -v */
424 if (!all && optind == argc)
428 /* if device is a filename get its real path */
429 if (stat(argv[optind], &statbuf) == 0) {
430 char *tmp = simplify_path(argv[optind]);
431 safe_strncpy(device, tmp, PATH_MAX);
433 safe_strncpy(device, argv[optind], PATH_MAX);
437 if (optind + 1 < argc)
438 directory = simplify_path(argv[optind + 1]);
440 if (all || optind + 1 == argc) {
441 f = setmntent("/etc/fstab", "r");
444 perror_msg_and_die( "\nCannot read /etc/fstab");
446 while ((m = getmntent(f)) != NULL) {
447 if (! all && optind + 1 == argc && (
448 (strcmp(device, m->mnt_fsname) != 0) &&
449 (strcmp(device, m->mnt_dir) != 0) ) ) {
453 if (all && ( // If we're mounting 'all'
454 (strstr(m->mnt_opts, "noauto")) || // and the file system isn't noauto,
455 (strstr(m->mnt_type, "swap")) || // and isn't swap or nfs, then mount it
456 (strstr(m->mnt_type, "nfs")) ) ) {
460 if (all || flags == 0) { // Allow single mount to override fstab flags
463 parse_mount_options(m->mnt_opts, &flags, &string_flags);
466 strcpy(device, m->mnt_fsname);
467 strcpy(directory, m->mnt_dir);
468 filesystemType = xstrdup(m->mnt_type);
470 extra_opts = string_flags;
472 #ifdef CONFIG_NFSMOUNT
473 if (strchr(device, ':') != NULL) {
474 filesystemType = "nfs";
475 if (nfsmount (device, directory, &flags, &extra_opts,
477 perror_msg("nfsmount failed");
482 if (!mount_one(device, directory, filesystemType, flags,
483 string_flags, useMtab, fakeIt, extra_opts, TRUE, all))
492 if (! all && f && m == NULL)
493 fprintf(stderr, "Can't find %s in /etc/fstab\n", device);