1 /* vi: set sw=4 ts=4: */
3 * Mini mount implementation for busybox
5 * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 * 3/21/1999 Charles P. Wright <cpwright@cpwright.com>
22 * searches through fstab when -a is passed
23 * will try mounting stuff with all fses when passed -t auto
25 * 1999-04-17 Dave Cinege...Rewrote -t auto. Fixed ro mtab.
27 * 1999-10-07 Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
28 * Rewrite of a lot of code. Removed mtab usage (I plan on
29 * putting it back as a compile-time option some time),
30 * major adjustments to option parsing, and some serious
33 * 1999-11-06 mtab suppport is back - andersee
35 * 2000-01-12 Ben Collins <bcollins@debian.org>, Borrowed utils-linux's
36 * mount to add loop support.
38 * 2000-04-30 Dave Cinege <dcinege@psychosis.com>
39 * Rewrote fstab while loop and lower mount section. Can now do
40 * single mounts from fstab. Can override fstab options for single
41 * mount. Common mount_one call for single mounts and 'all'. Fixed
42 * mtab updating and stale entries. Removed 'remount' default.
55 #if defined BB_FEATURE_USE_DEVPS_PATCH
56 # include <linux/devmtab.h> /* For Erik's nifty devmtab device driver */
60 MS_MGC_VAL = 0xc0ed0000, /* Magic number indicatng "new" flags */
61 MS_RDONLY = 1, /* Mount read-only */
62 MS_NOSUID = 2, /* Ignore suid and sgid bits */
63 MS_NODEV = 4, /* Disallow access to device special files */
64 MS_NOEXEC = 8, /* Disallow program execution */
65 MS_SYNCHRONOUS = 16, /* Writes are synced at once */
66 MS_REMOUNT = 32, /* Alter flags of a mounted FS */
67 MS_MANDLOCK = 64, /* Allow mandatory locks on an FS */
68 S_QUOTA = 128, /* Quota initialized for file/directory/symlink */
69 S_APPEND = 256, /* Append-only file */
70 S_IMMUTABLE = 512, /* Immutable file */
71 MS_NOATIME = 1024, /* Do not update access times. */
72 MS_NODIRATIME = 2048, /* Do not update directory access times */
76 #if defined BB_FEATURE_MOUNT_LOOP
78 #include <sys/ioctl.h>
79 static int use_loop = FALSE;
82 extern int mount (__const char *__special_file, __const char *__dir,
83 __const char *__fstype, unsigned long int __rwflag,
84 __const void *__data);
85 extern int umount (__const char *__special_file);
86 extern int umount2 (__const char *__special_file, int __flags);
88 extern int sysfs( int option, unsigned int fs_index, char * buf);
90 extern const char mtab_file[]; /* Defined in utility.c */
92 struct mount_options {
98 static const struct mount_options mount_options[] = {
99 {"async", ~MS_SYNCHRONOUS, 0},
100 {"atime", ~0, ~MS_NOATIME},
102 {"dev", ~MS_NODEV, 0},
103 {"diratime", ~0, ~MS_NODIRATIME},
104 {"exec", ~MS_NOEXEC, 0},
105 {"noatime", ~0, MS_NOATIME},
106 {"nodev", ~0, MS_NODEV},
107 {"nodiratime", ~0, MS_NODIRATIME},
108 {"noexec", ~0, MS_NOEXEC},
109 {"nosuid", ~0, MS_NOSUID},
110 {"remount", ~0, MS_REMOUNT},
111 {"ro", ~0, MS_RDONLY},
112 {"rw", ~MS_RDONLY, 0},
113 {"suid", ~MS_NOSUID, 0},
114 {"sync", ~0, MS_SYNCHRONOUS},
119 do_mount(char *specialfile, char *dir, char *filesystemtype,
120 long flags, void *string_flags, int useMtab, int fakeIt,
124 #if defined BB_FEATURE_MOUNT_LOOP
130 #if defined BB_FEATURE_MOUNT_LOOP
131 if (use_loop==TRUE) {
132 int loro = flags & MS_RDONLY;
134 lofile = specialfile;
136 specialfile = find_unused_loop_device();
137 if (specialfile == NULL) {
138 error_msg_and_die("Could not find a spare loop device");
140 if (set_loop(specialfile, lofile, 0, &loro)) {
141 error_msg_and_die("Could not setup loop device");
143 if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
144 error_msg("WARNING: loop device is read-only");
149 status = mount(specialfile, dir, filesystemtype, flags, string_flags);
150 if (errno == EROFS) {
151 error_msg("%s is write-protected, mounting read-only", specialfile);
152 status = mount(specialfile, dir, filesystemtype, flags |= MS_RDONLY, string_flags);
157 /* If the mount was sucessful, do anything needed, then return TRUE */
158 if (status == 0 || fakeIt==TRUE) {
160 #if defined BB_FEATURE_MTAB_SUPPORT
161 if (useMtab == TRUE) {
162 erase_mtab(specialfile); // Clean any stale entries
163 write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
169 /* Bummer. mount failed. Clean up */
170 #if defined BB_FEATURE_MOUNT_LOOP
171 if (lofile != NULL) {
172 del_loop(specialfile);
176 if (errno == EPERM) {
177 error_msg_and_die("permission denied. Are you root?");
185 /* Seperate standard mount options from the nonstandard string options */
187 parse_mount_options(char *options, int *flags, char *strflags)
191 char *comma = strchr(options, ',');
192 const struct mount_options *f = mount_options;
197 while (f->name != 0) {
198 if (strcasecmp(f->name, options) == 0) {
207 #if defined BB_FEATURE_MOUNT_LOOP
208 if (gotone == FALSE && !strcasecmp("loop", options)) { /* loop device support */
213 if (*strflags && strflags != '\0' && gotone == FALSE) {
214 char *temp = strflags;
216 temp += strlen(strflags);
221 strcat(strflags, options);
232 mount_one(char *blockDevice, char *directory, char *filesystemType,
233 unsigned long flags, char *string_flags, int useMtab, int fakeIt,
234 char *mtab_opts, int whineOnErrors)
238 if (strcmp(filesystemType, "auto") == 0) {
239 static const char *noauto_array[] = { "tmpfs", "shm", "proc", "ramfs", "devpts", "devfs", 0 };
240 const char **noauto_fstype;
241 const int num_of_filesystems = sysfs(3, 0, 0);
247 while(i < num_of_filesystems) {
248 sysfs(2, i++, filesystemType);
249 for (noauto_fstype = noauto_array; *noauto_fstype; noauto_fstype++) {
250 if (!strcmp(filesystemType, *noauto_fstype)) {
254 if (!*noauto_fstype) {
255 status = do_mount(blockDevice, directory, filesystemType,
256 flags | MS_MGC_VAL, string_flags,
257 useMtab, fakeIt, mtab_opts);
263 status = do_mount(blockDevice, directory, filesystemType,
264 flags | MS_MGC_VAL, string_flags, useMtab,
268 if (status == FALSE) {
269 if (whineOnErrors == TRUE) {
270 perror_msg("Mounting %s on %s failed", blockDevice, directory);
279 #if defined BB_FEATURE_USE_DEVPS_PATCH
280 int fd, i, numfilesystems;
281 char device[] = "/dev/mtab";
282 struct k_mntent *mntentlist;
285 fd = open(device, O_RDONLY);
287 perror_msg_and_die("open failed for `%s'", device);
289 /* How many mounted filesystems? We need to know to
290 * allocate enough space for later... */
291 numfilesystems = ioctl (fd, DEVMTAB_COUNT_MOUNTS);
292 if (numfilesystems<0)
293 perror_msg_and_die( "\nDEVMTAB_COUNT_MOUNTS");
294 mntentlist = (struct k_mntent *) xcalloc ( numfilesystems, sizeof(struct k_mntent));
296 /* Grab the list of mounted filesystems */
297 if (ioctl (fd, DEVMTAB_GET_MOUNTS, mntentlist)<0)
298 perror_msg_and_die( "\nDEVMTAB_GET_MOUNTS");
300 for( i = 0 ; i < numfilesystems ; i++) {
301 printf( "%s %s %s %s %d %d\n", mntentlist[i].mnt_fsname,
302 mntentlist[i].mnt_dir, mntentlist[i].mnt_type,
303 mntentlist[i].mnt_opts, mntentlist[i].mnt_freq,
304 mntentlist[i].mnt_passno);
306 #ifdef BB_FEATURE_CLEAN_UP
307 /* Don't bother to close files or free memory. Exit
308 * does that automagically, so we can save a few bytes */
314 FILE *mountTable = setmntent(mtab_file, "r");
319 while ((m = getmntent(mountTable)) != 0) {
320 char *blockDevice = m->mnt_fsname;
321 if (strcmp(blockDevice, "/dev/root") == 0) {
322 find_real_root_device_name( blockDevice);
324 printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
325 m->mnt_type, m->mnt_opts);
327 endmntent(mountTable);
329 perror_msg_and_die("%s", mtab_file);
335 extern int mount_main(int argc, char **argv)
338 char string_flags_buf[1024] = "";
339 char *string_flags = string_flags_buf;
340 char *extra_opts = string_flags_buf;
342 char *filesystemType = "auto";
343 char *device = xmalloc(PATH_MAX);
344 char *directory = xmalloc(PATH_MAX);
348 int rc = EXIT_FAILURE;
349 int fstabmount = FALSE;
353 while ((opt = getopt(argc, argv, "o:rt:wafnv")) > 0) {
356 parse_mount_options(optarg, &flags, string_flags);
362 filesystemType = optarg;
373 #ifdef BB_FEATURE_MTAB_SUPPORT
379 break; /* ignore -v */
383 if (!all && optind == argc)
387 /* if device is a filename get its real path */
388 if ((strchr(argv[optind], ':') == NULL) &&
389 (stat(argv[optind], &statbuf) == 0)) {
390 realpath(argv[optind], device);
392 safe_strncpy(device, argv[optind], PATH_MAX);
396 if (optind + 1 < argc) {
397 if (realpath(argv[optind + 1], directory) == NULL) {
398 perror_msg_and_die("%s", directory);
402 if (all == TRUE || optind + 1 == argc) {
403 struct mntent *m = NULL;
404 FILE *f = setmntent("/etc/fstab", "r");
408 perror_msg_and_die( "\nCannot read /etc/fstab");
410 while ((m = getmntent(f)) != NULL) {
411 if (all == FALSE && optind + 1 == argc && (
412 (strcmp(device, m->mnt_fsname) != 0) &&
413 (strcmp(device, m->mnt_dir) != 0) ) ) {
417 if (all == TRUE && ( // If we're mounting 'all'
418 (strstr(m->mnt_opts, "noauto")) || // and the file system isn't noauto,
419 (strstr(m->mnt_type, "swap")) || // and isn't swap or nfs, then mount it
420 (strstr(m->mnt_type, "nfs")) ) ) {
424 if (all == TRUE || flags == 0) { // Allow single mount to override fstab flags
426 *string_flags = '\0';
427 parse_mount_options(m->mnt_opts, &flags, string_flags);
430 strcpy(device, m->mnt_fsname);
431 strcpy(directory, m->mnt_dir);
432 filesystemType = strdup(m->mnt_type);
434 string_flags = strdup(string_flags);
437 if (strchr(device, ':') != NULL)
438 filesystemType = "nfs";
439 if (strcmp(filesystemType, "nfs") == 0) {
440 if (nfsmount (device, directory, &flags, &extra_opts,
442 perror_msg("nfsmount failed");
447 if (!mount_one(device, directory, filesystemType, flags,
448 string_flags, useMtab, fakeIt, extra_opts, TRUE))
454 if (fstabmount == TRUE)
457 if (all == FALSE && fstabmount == TRUE && m == NULL)
458 fprintf(stderr, "Can't find %s in /etc/fstab\n", device);