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 #define MS_MGC_VAL 0xc0ed0000 /* Magic number indicatng "new" flags */
60 #define MS_RDONLY 1 /* Mount read-only */
61 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
62 #define MS_NODEV 4 /* Disallow access to device special files */
63 #define MS_NOEXEC 8 /* Disallow program execution */
64 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
65 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
66 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
67 #define S_QUOTA 128 /* Quota initialized for file/directory/symlink */
68 #define S_APPEND 256 /* Append-only file */
69 #define S_IMMUTABLE 512 /* Immutable file */
70 #define MS_NOATIME 1024 /* Do not update access times. */
71 #define 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,
126 #if defined BB_FEATURE_MOUNT_LOOP
127 if (use_loop==TRUE) {
128 int loro = flags & MS_RDONLY;
129 char *lofile = specialfile;
131 specialfile = find_unused_loop_device();
132 if (specialfile == NULL) {
133 errorMsg("Could not find a spare loop device\n");
136 if (set_loop(specialfile, lofile, 0, &loro)) {
137 errorMsg("Could not setup loop device\n");
140 if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
141 errorMsg("WARNING: loop device is read-only\n");
146 status = mount(specialfile, dir, filesystemtype, flags, string_flags);
150 /* If the mount was sucessful, do anything needed, then return TRUE */
151 if (status == 0 || fakeIt==TRUE) {
154 if (useMtab == TRUE) {
155 erase_mtab(specialfile); // Clean any stale entries
156 write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
162 /* Bummer. mount failed. Clean up */
163 #if defined BB_FEATURE_MOUNT_LOOP
164 if (lofile != NULL) {
165 del_loop(specialfile);
169 if (errno == EPERM) {
170 fatalError("permission denied. Are you root?\n");
178 /* Seperate standard mount options from the nonstandard string options */
180 parse_mount_options(char *options, int *flags, char *strflags)
184 char *comma = strchr(options, ',');
185 const struct mount_options *f = mount_options;
190 while (f->name != 0) {
191 if (strcasecmp(f->name, options) == 0) {
200 #if defined BB_FEATURE_MOUNT_LOOP
201 if (gotone == FALSE && !strcasecmp("loop", options)) { /* loop device support */
206 if (*strflags && strflags != '\0' && gotone == FALSE) {
207 char *temp = strflags;
209 temp += strlen(strflags);
214 strcat(strflags, options);
225 mount_one(char *blockDevice, char *directory, char *filesystemType,
226 unsigned long flags, char *string_flags, int useMtab, int fakeIt,
227 char *mtab_opts, int whineOnErrors)
231 #if defined BB_FEATURE_USE_PROCFS
233 if (strcmp(filesystemType, "auto") == 0) {
234 FILE *f = fopen("/proc/filesystems", "r");
239 while (fgets(buf, sizeof(buf), f) != NULL) {
240 filesystemType = buf;
241 if (*filesystemType == '\t') { // Not a nodev filesystem
243 // Add NULL termination to each line
244 while (*filesystemType && *filesystemType != '\n')
246 *filesystemType = '\0';
248 filesystemType = buf;
249 filesystemType++; // hop past tab
251 status = do_mount(blockDevice, directory, filesystemType,
252 flags | MS_MGC_VAL, string_flags,
253 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 fatalError("open failed for `%s': %s\n", device, strerror (errno));
272 /* How many filesystems? We need to know to allocate enough space */
273 numfilesystems = ioctl (fd, DEVMTAB_COUNT_FILESYSTEMS);
274 if (numfilesystems<0)
275 fatalError("\nDEVMTAB_COUNT_FILESYSTEMS: %s\n", strerror (errno));
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 fatalError("\nDEVMTAB_GET_FILESYSTEMS: %s\n", strerror (errno));
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 errorMsg("Mounting %s on %s failed: %s\n",
307 blockDevice, directory, strerror(errno));
314 extern int mount_main(int argc, char **argv)
316 char string_flags_buf[1024] = "";
317 char *string_flags = string_flags_buf;
318 char *extra_opts = string_flags_buf;
320 char *filesystemType = "auto";
322 char *directory = NULL;
328 int fstabmount = FALSE;
330 #if defined BB_FEATURE_USE_DEVPS_PATCH
332 int fd, i, numfilesystems;
333 char device[] = "/dev/mtab";
334 struct k_mntent *mntentlist;
337 fd = open(device, O_RDONLY);
339 fatalError("open failed for `%s': %s\n", device, strerror (errno));
341 /* How many mounted filesystems? We need to know to
342 * allocate enough space for later... */
343 numfilesystems = ioctl (fd, DEVMTAB_COUNT_MOUNTS);
344 if (numfilesystems<0)
345 fatalError( "\nDEVMTAB_COUNT_MOUNTS: %s\n", strerror (errno));
346 mntentlist = (struct k_mntent *) xcalloc ( numfilesystems, sizeof(struct k_mntent));
348 /* Grab the list of mounted filesystems */
349 if (ioctl (fd, DEVMTAB_GET_MOUNTS, mntentlist)<0)
350 fatalError( "\nDEVMTAB_GET_MOUNTS: %s\n", strerror (errno));
352 for( i = 0 ; i < numfilesystems ; i++) {
353 fprintf( stdout, "%s %s %s %s %d %d\n", mntentlist[i].mnt_fsname,
354 mntentlist[i].mnt_dir, mntentlist[i].mnt_type,
355 mntentlist[i].mnt_opts, mntentlist[i].mnt_freq,
356 mntentlist[i].mnt_passno);
358 #ifdef BB_FEATURE_CLEAN_UP
359 /* Don't bother to close files or free memory. Exit
360 * does that automagically, so we can save a few bytes */
368 FILE *mountTable = setmntent(mtab_file, "r");
373 while ((m = getmntent(mountTable)) != 0) {
374 char *blockDevice = m->mnt_fsname;
375 if (strcmp(blockDevice, "/dev/root") == 0) {
376 find_real_root_device_name( blockDevice);
378 printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
379 m->mnt_type, m->mnt_opts);
381 endmntent(mountTable);
392 while (i > 0 && **argv) {
396 while (i > 0 && *++opt)
402 parse_mount_options(*(++argv), &flags, string_flags);
411 filesystemType = *(++argv);
428 break; /* ignore -v */
436 else if (directory == NULL)
446 if (all == TRUE || directory == NULL) {
448 FILE *f = setmntent("/etc/fstab", "r");
452 fatalError( "\nCannot read /etc/fstab: %s\n", strerror (errno));
454 while ((m = getmntent(f)) != NULL) {
455 if (all == FALSE && directory == NULL && (
456 (strcmp(device, m->mnt_fsname) != 0) &&
457 (strcmp(device, m->mnt_dir) != 0) ) ) {
461 if (all == TRUE && ( // If we're mounting 'all'
462 (strstr(m->mnt_opts, "noauto")) || // and the file system isn't noauto,
463 (strstr(m->mnt_type, "swap")) || // and isn't swap or nfs, then mount it
464 (strstr(m->mnt_type, "nfs")) ) ) {
468 if (all == TRUE || flags == 0) { // Allow single mount to override fstab flags
470 *string_flags = '\0';
471 parse_mount_options(m->mnt_opts, &flags, string_flags);
474 device = strdup(m->mnt_fsname);
475 directory = strdup(m->mnt_dir);
476 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 fatalError("nfsmount failed: %s\n", strerror(errno));
490 rc = mount_one(device, directory, filesystemType, flags,
491 string_flags, useMtab, fakeIt, extra_opts, TRUE);
496 rc = TRUE; // Always return 0 for 'all'
498 if (fstabmount == TRUE)
501 if (all == FALSE && fstabmount == TRUE && directory == NULL)
502 fprintf(stderr, "Can't find %s in /etc/fstab\n", device);