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);
87 #include <sys/syscall.h>
88 #include <linux/unistd.h>
89 static int sysfs( int option, unsigned int fs_index, char * buf);
90 _syscall3(int, sysfs, int, option, unsigned int, fs_index, char *, buf);
93 extern const char mtab_file[]; /* Defined in utility.c */
95 struct mount_options {
101 static const struct mount_options mount_options[] = {
102 {"async", ~MS_SYNCHRONOUS, 0},
103 {"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},
122 do_mount(char *specialfile, char *dir, char *filesystemtype,
123 long flags, void *string_flags, int useMtab, int fakeIt,
127 #if defined BB_FEATURE_MOUNT_LOOP
133 #if defined BB_FEATURE_MOUNT_LOOP
134 if (use_loop==TRUE) {
135 int loro = flags & MS_RDONLY;
137 lofile = specialfile;
139 specialfile = find_unused_loop_device();
140 if (specialfile == NULL) {
141 error_msg_and_die("Could not find a spare loop device");
143 if (set_loop(specialfile, lofile, 0, &loro)) {
144 error_msg_and_die("Could not setup loop device");
146 if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
147 error_msg("WARNING: loop device is read-only");
152 status = mount(specialfile, dir, filesystemtype, flags, string_flags);
153 if (errno == EROFS) {
154 error_msg("%s is write-protected, mounting read-only", specialfile);
155 status = mount(specialfile, dir, filesystemtype, flags |= MS_RDONLY, string_flags);
160 /* If the mount was sucessful, do anything needed, then return TRUE */
161 if (status == 0 || fakeIt==TRUE) {
164 if (useMtab == TRUE) {
165 erase_mtab(specialfile); // Clean any stale entries
166 write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
172 /* Bummer. mount failed. Clean up */
173 #if defined BB_FEATURE_MOUNT_LOOP
174 if (lofile != NULL) {
175 del_loop(specialfile);
179 if (errno == EPERM) {
180 error_msg_and_die("permission denied. Are you root?");
188 /* Seperate standard mount options from the nonstandard string options */
190 parse_mount_options(char *options, int *flags, char *strflags)
194 char *comma = strchr(options, ',');
195 const struct mount_options *f = mount_options;
200 while (f->name != 0) {
201 if (strcasecmp(f->name, options) == 0) {
210 #if defined BB_FEATURE_MOUNT_LOOP
211 if (gotone == FALSE && !strcasecmp("loop", options)) { /* loop device support */
216 if (*strflags && strflags != '\0' && gotone == FALSE) {
217 char *temp = strflags;
219 temp += strlen(strflags);
224 strcat(strflags, options);
235 mount_one(char *blockDevice, char *directory, char *filesystemType,
236 unsigned long flags, char *string_flags, int useMtab, int fakeIt,
237 char *mtab_opts, int whineOnErrors)
241 if (strcmp(filesystemType, "auto") == 0) {
242 static const char *strings[] = { "tmpfs", "shm", "proc", "ramfs", "devpts", 0 };
243 const char** nodevfss;
244 const int num_of_filesystems = sysfs(3, 0, 0);
250 while(i < num_of_filesystems) {
251 sysfs(2, i++, filesystemType);
252 for (nodevfss = strings; *nodevfss; nodevfss++) {
253 if (!strcmp(filesystemType, *nodevfss)) {
258 status = do_mount(blockDevice, directory, filesystemType,
259 flags | MS_MGC_VAL, string_flags,
260 useMtab, fakeIt, mtab_opts);
266 status = do_mount(blockDevice, directory, filesystemType,
267 flags | MS_MGC_VAL, string_flags, useMtab,
271 if (status == FALSE) {
272 if (whineOnErrors == TRUE) {
273 perror_msg("Mounting %s on %s failed", blockDevice, directory);
280 extern int mount_main(int argc, char **argv)
282 char string_flags_buf[1024] = "";
283 char *string_flags = string_flags_buf;
284 char *extra_opts = string_flags_buf;
286 char *filesystemType = "auto";
288 char *directory = NULL;
293 int rc = EXIT_FAILURE;
294 int fstabmount = FALSE;
296 #if defined BB_FEATURE_USE_DEVPS_PATCH
298 int fd, i, numfilesystems;
299 char device[] = "/dev/mtab";
300 struct k_mntent *mntentlist;
303 fd = open(device, O_RDONLY);
305 perror_msg_and_die("open failed for `%s'", device);
307 /* How many mounted filesystems? We need to know to
308 * allocate enough space for later... */
309 numfilesystems = ioctl (fd, DEVMTAB_COUNT_MOUNTS);
310 if (numfilesystems<0)
311 perror_msg_and_die( "\nDEVMTAB_COUNT_MOUNTS");
312 mntentlist = (struct k_mntent *) xcalloc ( numfilesystems, sizeof(struct k_mntent));
314 /* Grab the list of mounted filesystems */
315 if (ioctl (fd, DEVMTAB_GET_MOUNTS, mntentlist)<0)
316 perror_msg_and_die( "\nDEVMTAB_GET_MOUNTS");
318 for( i = 0 ; i < numfilesystems ; i++) {
319 printf( "%s %s %s %s %d %d\n", mntentlist[i].mnt_fsname,
320 mntentlist[i].mnt_dir, mntentlist[i].mnt_type,
321 mntentlist[i].mnt_opts, mntentlist[i].mnt_freq,
322 mntentlist[i].mnt_passno);
324 #ifdef BB_FEATURE_CLEAN_UP
325 /* Don't bother to close files or free memory. Exit
326 * does that automagically, so we can save a few bytes */
334 FILE *mountTable = setmntent(mtab_file, "r");
339 while ((m = getmntent(mountTable)) != 0) {
340 char *blockDevice = m->mnt_fsname;
341 if (strcmp(blockDevice, "/dev/root") == 0) {
342 find_real_root_device_name( blockDevice);
344 printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
345 m->mnt_type, m->mnt_opts);
347 endmntent(mountTable);
349 perror_msg_and_die("%s", mtab_file);
358 while (i > 0 && **argv) {
362 while (i > 0 && *++opt)
368 parse_mount_options(*(++argv), &flags, string_flags);
377 filesystemType = *(++argv);
394 break; /* ignore -v */
402 else if (directory == NULL)
412 if (all == TRUE || directory == NULL) {
414 FILE *f = setmntent("/etc/fstab", "r");
418 perror_msg_and_die( "\nCannot read /etc/fstab");
420 while ((m = getmntent(f)) != NULL) {
421 if (all == FALSE && directory == NULL && (
422 (strcmp(device, m->mnt_fsname) != 0) &&
423 (strcmp(device, m->mnt_dir) != 0) ) ) {
427 if (all == TRUE && ( // If we're mounting 'all'
428 (strstr(m->mnt_opts, "noauto")) || // and the file system isn't noauto,
429 (strstr(m->mnt_type, "swap")) || // and isn't swap or nfs, then mount it
430 (strstr(m->mnt_type, "nfs")) ) ) {
434 if (all == TRUE || flags == 0) { // Allow single mount to override fstab flags
436 *string_flags = '\0';
437 parse_mount_options(m->mnt_opts, &flags, string_flags);
440 device = strdup(m->mnt_fsname);
441 directory = strdup(m->mnt_dir);
442 filesystemType = strdup(m->mnt_type);
444 string_flags = strdup(string_flags);
447 if (strchr(device, ':') != NULL)
448 filesystemType = "nfs";
449 if (strcmp(filesystemType, "nfs") == 0) {
450 if (nfsmount (device, directory, &flags, &extra_opts,
452 perror_msg("nfsmount failed");
457 if (!mount_one(device, directory, filesystemType, flags,
458 string_flags, useMtab, fakeIt, extra_opts, TRUE))
464 if (fstabmount == TRUE)
467 if (all == FALSE && fstabmount == TRUE && directory == NULL)
468 fprintf(stderr, "Can't find %s in /etc/fstab\n", device);