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.
54 #if defined BB_FEATURE_USE_DEVPS_PATCH
55 #include <linux/devmtab.h> /* For Erik's nifty devmtab device driver */
59 MS_MGC_VAL = 0xc0ed0000, /* Magic number indicatng "new" flags */
60 MS_RDONLY = 1, /* Mount read-only */
61 MS_NOSUID = 2, /* Ignore suid and sgid bits */
62 MS_NODEV = 4, /* Disallow access to device special files */
63 MS_NOEXEC = 8, /* Disallow program execution */
64 MS_SYNCHRONOUS = 16, /* Writes are synced at once */
65 MS_REMOUNT = 32, /* Alter flags of a mounted FS */
66 MS_MANDLOCK = 64, /* Allow mandatory locks on an FS */
67 S_QUOTA = 128, /* Quota initialized for file/directory/symlink */
68 S_APPEND = 256, /* Append-only file */
69 S_IMMUTABLE = 512, /* Immutable file */
70 MS_NOATIME = 1024, /* Do not update access times. */
71 MS_NODIRATIME = 2048, /* Do not update directory access times */
75 #if defined BB_FEATURE_MOUNT_LOOP
77 #include <sys/ioctl.h>
78 static int use_loop = FALSE;
81 extern int mount (__const char *__special_file, __const char *__dir,
82 __const char *__fstype, unsigned long int __rwflag,
83 __const void *__data);
84 extern int umount (__const char *__special_file);
85 extern int umount2 (__const char *__special_file, int __flags);
88 extern const char mtab_file[]; /* Defined in utility.c */
90 struct mount_options {
96 static const struct mount_options mount_options[] = {
97 {"async", ~MS_SYNCHRONOUS, 0},
98 {"atime", ~0, ~MS_NOATIME},
100 {"dev", ~MS_NODEV, 0},
101 {"diratime", ~0, ~MS_NODIRATIME},
102 {"exec", ~MS_NOEXEC, 0},
103 {"noatime", ~0, MS_NOATIME},
104 {"nodev", ~0, MS_NODEV},
105 {"nodiratime", ~0, MS_NODIRATIME},
106 {"noexec", ~0, MS_NOEXEC},
107 {"nosuid", ~0, MS_NOSUID},
108 {"remount", ~0, MS_REMOUNT},
109 {"ro", ~0, MS_RDONLY},
110 {"rw", ~MS_RDONLY, 0},
111 {"suid", ~MS_NOSUID, 0},
112 {"sync", ~0, MS_SYNCHRONOUS},
117 do_mount(char *specialfile, char *dir, char *filesystemtype,
118 long flags, void *string_flags, int useMtab, int fakeIt,
122 #if defined BB_FEATURE_MOUNT_LOOP
128 #if defined BB_FEATURE_MOUNT_LOOP
129 if (use_loop==TRUE) {
130 int loro = flags & MS_RDONLY;
131 char *lofile = specialfile;
133 specialfile = find_unused_loop_device();
134 if (specialfile == NULL) {
135 error_msg_and_die("Could not find a spare loop device\n");
137 if (set_loop(specialfile, lofile, 0, &loro)) {
138 error_msg_and_die("Could not setup loop device\n");
140 if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
141 error_msg("WARNING: loop device is read-only\n");
146 status = mount(specialfile, dir, filesystemtype, flags, string_flags);
147 if (errno == EROFS) {
148 error_msg("%s is write-protected, mounting read-only\n", specialfile);
149 status = mount(specialfile, dir, filesystemtype, flags |= MS_RDONLY, string_flags);
154 /* If the mount was sucessful, do anything needed, then return TRUE */
155 if (status == 0 || fakeIt==TRUE) {
158 if (useMtab == TRUE) {
159 erase_mtab(specialfile); // Clean any stale entries
160 write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
166 /* Bummer. mount failed. Clean up */
167 #if defined BB_FEATURE_MOUNT_LOOP
168 if (lofile != NULL) {
169 del_loop(specialfile);
173 if (errno == EPERM) {
174 error_msg_and_die("permission denied. Are you root?\n");
182 /* Seperate standard mount options from the nonstandard string options */
184 parse_mount_options(char *options, int *flags, char *strflags)
188 char *comma = strchr(options, ',');
189 const struct mount_options *f = mount_options;
194 while (f->name != 0) {
195 if (strcasecmp(f->name, options) == 0) {
204 #if defined BB_FEATURE_MOUNT_LOOP
205 if (gotone == FALSE && !strcasecmp("loop", options)) { /* loop device support */
210 if (*strflags && strflags != '\0' && gotone == FALSE) {
211 char *temp = strflags;
213 temp += strlen(strflags);
218 strcat(strflags, options);
229 mount_one(char *blockDevice, char *directory, char *filesystemType,
230 unsigned long flags, char *string_flags, int useMtab, int fakeIt,
231 char *mtab_opts, int whineOnErrors)
235 #if defined BB_FEATURE_USE_PROCFS
237 if (strcmp(filesystemType, "auto") == 0) {
238 FILE *f = fopen("/proc/filesystems", "r");
243 while (fgets(buf, sizeof(buf), f) != NULL) {
244 filesystemType = buf;
245 if (*filesystemType == '\t') { // Not a nodev filesystem
247 // Add NULL termination to each line
248 while (*filesystemType && *filesystemType != '\n')
250 *filesystemType = '\0';
252 filesystemType = buf;
253 filesystemType++; // hop past tab
255 status = do_mount(blockDevice, directory, filesystemType,
256 flags | MS_MGC_VAL, string_flags,
257 useMtab, fakeIt, mtab_opts);
265 #if defined BB_FEATURE_USE_DEVPS_PATCH
266 if (strcmp(filesystemType, "auto") == 0) {
267 int fd, i, numfilesystems;
268 char device[] = "/dev/mtab";
269 struct k_fstype *fslist;
272 fd = open(device, O_RDONLY);
274 perror_msg_and_die("open failed for `%s'", device);
276 /* How many filesystems? We need to know to allocate enough space */
277 numfilesystems = ioctl (fd, DEVMTAB_COUNT_FILESYSTEMS);
278 if (numfilesystems<0)
279 perror_msg_and_die("\nDEVMTAB_COUNT_FILESYSTEMS");
280 fslist = (struct k_fstype *) xcalloc ( numfilesystems, sizeof(struct k_fstype));
282 /* Grab the list of available filesystems */
283 status = ioctl (fd, DEVMTAB_GET_FILESYSTEMS, fslist);
285 perror_msg_and_die("\nDEVMTAB_GET_FILESYSTEMS");
287 /* Walk the list trying to mount filesystems
288 * that do not claim to be nodev filesystems */
289 for( i = 0 ; i < numfilesystems ; i++) {
290 if (fslist[i].mnt_nodev)
292 status = do_mount(blockDevice, directory, fslist[i].mnt_type,
293 flags | MS_MGC_VAL, string_flags,
294 useMtab, fakeIt, mtab_opts);
303 status = do_mount(blockDevice, directory, filesystemType,
304 flags | MS_MGC_VAL, string_flags, useMtab,
308 if (status == FALSE) {
309 if (whineOnErrors == TRUE) {
310 perror_msg("Mounting %s on %s failed", blockDevice, directory);
317 extern int mount_main(int argc, char **argv)
319 char string_flags_buf[1024] = "";
320 char *string_flags = string_flags_buf;
321 char *extra_opts = string_flags_buf;
323 char *filesystemType = "auto";
325 char *directory = NULL;
330 int rc = EXIT_FAILURE;
331 int fstabmount = FALSE;
333 #if defined BB_FEATURE_USE_DEVPS_PATCH
335 int fd, i, numfilesystems;
336 char device[] = "/dev/mtab";
337 struct k_mntent *mntentlist;
340 fd = open(device, O_RDONLY);
342 perror_msg_and_die("open failed for `%s'", device);
344 /* How many mounted filesystems? We need to know to
345 * allocate enough space for later... */
346 numfilesystems = ioctl (fd, DEVMTAB_COUNT_MOUNTS);
347 if (numfilesystems<0)
348 perror_msg_and_die( "\nDEVMTAB_COUNT_MOUNTS");
349 mntentlist = (struct k_mntent *) xcalloc ( numfilesystems, sizeof(struct k_mntent));
351 /* Grab the list of mounted filesystems */
352 if (ioctl (fd, DEVMTAB_GET_MOUNTS, mntentlist)<0)
353 perror_msg_and_die( "\nDEVMTAB_GET_MOUNTS");
355 for( i = 0 ; i < numfilesystems ; i++) {
356 printf( "%s %s %s %s %d %d\n", mntentlist[i].mnt_fsname,
357 mntentlist[i].mnt_dir, mntentlist[i].mnt_type,
358 mntentlist[i].mnt_opts, mntentlist[i].mnt_freq,
359 mntentlist[i].mnt_passno);
361 #ifdef BB_FEATURE_CLEAN_UP
362 /* Don't bother to close files or free memory. Exit
363 * does that automagically, so we can save a few bytes */
371 FILE *mountTable = setmntent(mtab_file, "r");
376 while ((m = getmntent(mountTable)) != 0) {
377 char *blockDevice = m->mnt_fsname;
378 if (strcmp(blockDevice, "/dev/root") == 0) {
379 find_real_root_device_name( blockDevice);
381 printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
382 m->mnt_type, m->mnt_opts);
384 endmntent(mountTable);
386 perror_msg_and_die("%s", mtab_file);
395 while (i > 0 && **argv) {
399 while (i > 0 && *++opt)
405 parse_mount_options(*(++argv), &flags, string_flags);
414 filesystemType = *(++argv);
431 break; /* ignore -v */
439 else if (directory == NULL)
449 if (all == TRUE || directory == NULL) {
451 FILE *f = setmntent("/etc/fstab", "r");
455 perror_msg_and_die( "\nCannot read /etc/fstab");
457 while ((m = getmntent(f)) != NULL) {
458 if (all == FALSE && directory == NULL && (
459 (strcmp(device, m->mnt_fsname) != 0) &&
460 (strcmp(device, m->mnt_dir) != 0) ) ) {
464 if (all == TRUE && ( // If we're mounting 'all'
465 (strstr(m->mnt_opts, "noauto")) || // and the file system isn't noauto,
466 (strstr(m->mnt_type, "swap")) || // and isn't swap or nfs, then mount it
467 (strstr(m->mnt_type, "nfs")) ) ) {
471 if (all == TRUE || flags == 0) { // Allow single mount to override fstab flags
473 *string_flags = '\0';
474 parse_mount_options(m->mnt_opts, &flags, string_flags);
477 device = strdup(m->mnt_fsname);
478 directory = strdup(m->mnt_dir);
479 filesystemType = strdup(m->mnt_type);
483 if (strchr(device, ':') != NULL)
484 filesystemType = "nfs";
485 if (strcmp(filesystemType, "nfs") == 0) {
486 rc = nfsmount (device, directory, &flags,
487 &extra_opts, &string_flags, 1);
489 perror_msg_and_die("nfsmount failed");
494 if (!mount_one(device, directory, filesystemType, flags,
495 string_flags, useMtab, fakeIt, extra_opts, TRUE))
501 if (fstabmount == TRUE)
504 if (all == FALSE && fstabmount == TRUE && directory == NULL)
505 fprintf(stderr, "Can't find %s in /etc/fstab\n", device);