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.
53 #if defined BB_FEATURE_USE_DEVPS_PATCH
54 #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;
132 lofile = specialfile;
134 specialfile = find_unused_loop_device();
135 if (specialfile == NULL) {
136 error_msg_and_die("Could not find a spare loop device");
138 if (set_loop(specialfile, lofile, 0, &loro)) {
139 error_msg_and_die("Could not setup loop device");
141 if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
142 error_msg("WARNING: loop device is read-only");
147 status = mount(specialfile, dir, filesystemtype, flags, string_flags);
148 if (errno == EROFS) {
149 error_msg("%s is write-protected, mounting read-only", specialfile);
150 status = mount(specialfile, dir, filesystemtype, flags |= MS_RDONLY, string_flags);
155 /* If the mount was sucessful, do anything needed, then return TRUE */
156 if (status == 0 || fakeIt==TRUE) {
159 if (useMtab == TRUE) {
160 erase_mtab(specialfile); // Clean any stale entries
161 write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
167 /* Bummer. mount failed. Clean up */
168 #if defined BB_FEATURE_MOUNT_LOOP
169 if (lofile != NULL) {
170 del_loop(specialfile);
174 if (errno == EPERM) {
175 error_msg_and_die("permission denied. Are you root?");
183 /* Seperate standard mount options from the nonstandard string options */
185 parse_mount_options(char *options, int *flags, char *strflags)
189 char *comma = strchr(options, ',');
190 const struct mount_options *f = mount_options;
195 while (f->name != 0) {
196 if (strcasecmp(f->name, options) == 0) {
205 #if defined BB_FEATURE_MOUNT_LOOP
206 if (gotone == FALSE && !strcasecmp("loop", options)) { /* loop device support */
211 if (*strflags && strflags != '\0' && gotone == FALSE) {
212 char *temp = strflags;
214 temp += strlen(strflags);
219 strcat(strflags, options);
230 mount_one(char *blockDevice, char *directory, char *filesystemType,
231 unsigned long flags, char *string_flags, int useMtab, int fakeIt,
232 char *mtab_opts, int whineOnErrors)
237 if (strcmp(filesystemType, "auto") == 0) {
238 FILE *f = xfopen("/proc/filesystems", "r");
240 while (fgets(buf, sizeof(buf), f) != NULL) {
241 filesystemType = buf;
242 if (*filesystemType == '\t') { // Not a nodev filesystem
244 // Add NULL termination to each line
245 while (*filesystemType && *filesystemType != '\n')
247 *filesystemType = '\0';
249 filesystemType = buf;
250 filesystemType++; // hop past tab
252 status = do_mount(blockDevice, directory, filesystemType,
253 flags | MS_MGC_VAL, string_flags,
254 useMtab, fakeIt, mtab_opts);
261 #if defined BB_FEATURE_USE_DEVPS_PATCH
262 if (strcmp(filesystemType, "auto") == 0) {
263 int fd, i, numfilesystems;
264 char device[] = "/dev/mtab";
265 struct k_fstype *fslist;
268 fd = open(device, O_RDONLY);
270 perror_msg_and_die("open failed for `%s'", device);
272 /* How many filesystems? We need to know to allocate enough space */
273 numfilesystems = ioctl (fd, DEVMTAB_COUNT_FILESYSTEMS);
274 if (numfilesystems<0)
275 perror_msg_and_die("\nDEVMTAB_COUNT_FILESYSTEMS");
276 fslist = (struct k_fstype *) xcalloc ( numfilesystems, sizeof(struct k_fstype));
278 /* Grab the list of available filesystems */
279 status = ioctl (fd, DEVMTAB_GET_FILESYSTEMS, fslist);
281 perror_msg_and_die("\nDEVMTAB_GET_FILESYSTEMS");
283 /* Walk the list trying to mount filesystems
284 * that do not claim to be nodev filesystems */
285 for( i = 0 ; i < numfilesystems ; i++) {
286 if (fslist[i].mnt_nodev)
288 status = do_mount(blockDevice, directory, fslist[i].mnt_type,
289 flags | MS_MGC_VAL, string_flags,
290 useMtab, fakeIt, mtab_opts);
299 status = do_mount(blockDevice, directory, filesystemType,
300 flags | MS_MGC_VAL, string_flags, useMtab,
304 if (status == FALSE) {
305 if (whineOnErrors == TRUE) {
306 perror_msg("Mounting %s on %s failed", blockDevice, directory);
313 extern int mount_main(int argc, char **argv)
315 char string_flags_buf[1024] = "";
316 char *string_flags = string_flags_buf;
317 char *extra_opts = string_flags_buf;
319 char *filesystemType = "auto";
321 char *directory = NULL;
326 int rc = EXIT_FAILURE;
327 int fstabmount = FALSE;
329 #if defined BB_FEATURE_USE_DEVPS_PATCH
331 int fd, i, numfilesystems;
332 char device[] = "/dev/mtab";
333 struct k_mntent *mntentlist;
336 fd = open(device, O_RDONLY);
338 perror_msg_and_die("open failed for `%s'", device);
340 /* How many mounted filesystems? We need to know to
341 * allocate enough space for later... */
342 numfilesystems = ioctl (fd, DEVMTAB_COUNT_MOUNTS);
343 if (numfilesystems<0)
344 perror_msg_and_die( "\nDEVMTAB_COUNT_MOUNTS");
345 mntentlist = (struct k_mntent *) xcalloc ( numfilesystems, sizeof(struct k_mntent));
347 /* Grab the list of mounted filesystems */
348 if (ioctl (fd, DEVMTAB_GET_MOUNTS, mntentlist)<0)
349 perror_msg_and_die( "\nDEVMTAB_GET_MOUNTS");
351 for( i = 0 ; i < numfilesystems ; i++) {
352 printf( "%s %s %s %s %d %d\n", mntentlist[i].mnt_fsname,
353 mntentlist[i].mnt_dir, mntentlist[i].mnt_type,
354 mntentlist[i].mnt_opts, mntentlist[i].mnt_freq,
355 mntentlist[i].mnt_passno);
357 #ifdef BB_FEATURE_CLEAN_UP
358 /* Don't bother to close files or free memory. Exit
359 * does that automagically, so we can save a few bytes */
367 FILE *mountTable = setmntent(mtab_file, "r");
372 while ((m = getmntent(mountTable)) != 0) {
373 char *blockDevice = m->mnt_fsname;
374 if (strcmp(blockDevice, "/dev/root") == 0) {
375 find_real_root_device_name( blockDevice);
377 printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
378 m->mnt_type, m->mnt_opts);
380 endmntent(mountTable);
382 perror_msg_and_die("%s", mtab_file);
391 while (i > 0 && **argv) {
395 while (i > 0 && *++opt)
401 parse_mount_options(*(++argv), &flags, string_flags);
410 filesystemType = *(++argv);
427 break; /* ignore -v */
435 else if (directory == NULL)
445 if (all == TRUE || directory == NULL) {
447 FILE *f = setmntent("/etc/fstab", "r");
451 perror_msg_and_die( "\nCannot read /etc/fstab");
453 while ((m = getmntent(f)) != NULL) {
454 if (all == FALSE && directory == NULL && (
455 (strcmp(device, m->mnt_fsname) != 0) &&
456 (strcmp(device, m->mnt_dir) != 0) ) ) {
460 if (all == TRUE && ( // If we're mounting 'all'
461 (strstr(m->mnt_opts, "noauto")) || // and the file system isn't noauto,
462 (strstr(m->mnt_type, "swap")) || // and isn't swap or nfs, then mount it
463 (strstr(m->mnt_type, "nfs")) ) ) {
467 if (all == TRUE || flags == 0) { // Allow single mount to override fstab flags
469 *string_flags = '\0';
470 parse_mount_options(m->mnt_opts, &flags, string_flags);
473 device = strdup(m->mnt_fsname);
474 directory = strdup(m->mnt_dir);
475 filesystemType = strdup(m->mnt_type);
479 if (strchr(device, ':') != NULL)
480 filesystemType = "nfs";
481 if (strcmp(filesystemType, "nfs") == 0) {
482 rc = nfsmount (device, directory, &flags,
483 &extra_opts, &string_flags, 1);
485 perror_msg_and_die("nfsmount failed");
490 if (!mount_one(device, directory, filesystemType, flags,
491 string_flags, useMtab, fakeIt, extra_opts, TRUE))
497 if (fstabmount == TRUE)
500 if (all == FALSE && fstabmount == TRUE && directory == NULL)
501 fprintf(stderr, "Can't find %s in /etc/fstab\n", device);