1 /* vi: set sw=4 ts=4: */
3 * Mini mount implementation for busybox
5 * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
6 * Copyright (C) 1999-2002 by Erik Andersen <andersee@debian.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * 3/21/1999 Charles P. Wright <cpwright@cpwright.com>
23 * searches through fstab when -a is passed
24 * will try mounting stuff with all fses when passed -t auto
26 * 1999-04-17 Dave Cinege...Rewrote -t auto. Fixed ro mtab.
28 * 1999-10-07 Erik Andersen <andersee@debian.org>.
29 * Rewrite of a lot of code. Removed mtab usage (I plan on
30 * putting it back as a compile-time option some time),
31 * major adjustments to option parsing, and some serious
34 * 1999-11-06 mtab suppport is back - andersee
36 * 2000-01-12 Ben Collins <bcollins@debian.org>, Borrowed utils-linux's
37 * mount to add loop support.
39 * 2000-04-30 Dave Cinege <dcinege@psychosis.com>
40 * Rewrote fstab while loop and lower mount section. Can now do
41 * single mounts from fstab. Can override fstab options for single
42 * mount. Common mount_one call for single mounts and 'all'. Fixed
43 * mtab updating and stale entries. Removed 'remount' default.
56 #if defined CONFIG_FEATURE_USE_DEVPS_PATCH
57 # include <linux/devmtab.h> /* For Erik's nifty devmtab device driver */
61 MS_MGC_VAL = 0xc0ed0000, /* Magic number indicatng "new" flags */
62 MS_RDONLY = 1, /* Mount read-only */
63 MS_NOSUID = 2, /* Ignore suid and sgid bits */
64 MS_NODEV = 4, /* Disallow access to device special files */
65 MS_NOEXEC = 8, /* Disallow program execution */
66 MS_SYNCHRONOUS = 16, /* Writes are synced at once */
67 MS_REMOUNT = 32, /* Alter flags of a mounted FS */
68 MS_MANDLOCK = 64, /* Allow mandatory locks on an FS */
69 S_QUOTA = 128, /* Quota initialized for file/directory/symlink */
70 S_APPEND = 256, /* Append-only file */
71 S_IMMUTABLE = 512, /* Immutable file */
72 MS_NOATIME = 1024, /* Do not update access times. */
73 MS_NODIRATIME = 2048, /* Do not update directory access times */
74 MS_BIND = 4096, /* Use the new linux 2.4.x "mount --bind" feature */
78 #if defined CONFIG_FEATURE_MOUNT_LOOP
80 #include <sys/ioctl.h>
81 static int use_loop = FALSE;
84 extern int mount(__const char *__special_file, __const char *__dir,
85 __const char *__fstype, unsigned long int __rwflag,
86 __const void *__data);
87 extern int umount(__const char *__special_file);
88 extern int umount2(__const char *__special_file, int __flags);
90 extern int sysfs(int option, unsigned int fs_index, char *buf);
92 extern const char mtab_file[]; /* Defined in utility.c */
94 struct mount_options {
100 static const struct mount_options mount_options[] = {
101 {"async", ~MS_SYNCHRONOUS, 0},
102 {"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},
118 {"bind", ~0, MS_BIND},
123 do_mount(char *specialfile, char *dir, char *filesystemtype, long flags,
124 void *string_flags, int useMtab, int fakeIt, char *mtab_opts,
129 #if defined CONFIG_FEATURE_MOUNT_LOOP
134 #if defined CONFIG_FEATURE_MOUNT_LOOP
135 if (use_loop == TRUE) {
136 int loro = flags & MS_RDONLY;
138 lofile = specialfile;
140 specialfile = find_unused_loop_device();
141 if (specialfile == NULL) {
142 error_msg_and_die("Could not find a spare loop device");
144 if (set_loop(specialfile, lofile, 0, &loro)) {
145 error_msg_and_die("Could not setup loop device");
147 if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
148 error_msg("WARNING: loop device is read-only");
153 status = mount(specialfile, dir, filesystemtype, flags, string_flags);
154 if (status < 0 && errno == EROFS) {
155 error_msg("%s is write-protected, mounting read-only",
157 status = mount(specialfile, dir, filesystemtype, flags |=
158 MS_RDONLY, string_flags);
160 /* Don't whine about already mounted filesystems when mounting all. */
161 if (status < 0 && errno == EBUSY && mount_all) {
167 /* If the mount was sucessful, do anything needed, then return TRUE */
168 if (status == 0 || fakeIt == TRUE) {
170 #if defined CONFIG_FEATURE_MTAB_SUPPORT
172 erase_mtab(specialfile); /* Clean any stale entries */
173 write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
179 /* Bummer. mount failed. Clean up */
180 #if defined CONFIG_FEATURE_MOUNT_LOOP
181 if (lofile != NULL) {
182 del_loop(specialfile);
186 if (errno == EPERM) {
187 error_msg_and_die("permission denied. Are you root?");
194 static void paste_str(char **s1, const char *s2)
196 *s1 = xrealloc(*s1, strlen(*s1) + strlen(s2) + 1);
200 /* Seperate standard mount options from the nonstandard string options */
201 static void parse_mount_options(char *options, int *flags, char **strflags)
205 char *comma = strchr(options, ',');
206 const struct mount_options *f = mount_options;
212 while (f->name != 0) {
213 if (strcasecmp(f->name, options) == 0) {
222 #if defined CONFIG_FEATURE_MOUNT_LOOP
223 if (!strcasecmp("loop", options)) { /* loop device support */
230 /* have previous parsed options */
231 paste_str(strflags, ",");
233 paste_str(strflags, options);
244 static int mount_one(char *blockDevice, char *directory, char *filesystemType,
245 unsigned long flags, char *string_flags, int useMtab,
246 int fakeIt, char *mtab_opts, int whineOnErrors,
251 #if defined CONFIG_FEATURE_USE_DEVPS_PATCH
252 if (strcmp(filesystemType, "auto") == 0) {
253 static const char *noauto_array[] =
254 { "tmpfs", "shm", "proc", "ramfs", "devpts", "devfs", "usbdevfs",
256 const char **noauto_fstype;
257 const int num_of_filesystems = sysfs(3, 0, 0);
261 filesystemType = buf;
263 while (i < num_of_filesystems) {
264 sysfs(2, i++, filesystemType);
265 for (noauto_fstype = noauto_array; *noauto_fstype;
267 if (!strcmp(filesystemType, *noauto_fstype)) {
271 if (!*noauto_fstype) {
273 do_mount(blockDevice, directory, filesystemType,
274 flags | MS_MGC_VAL, string_flags, useMtab,
275 fakeIt, mtab_opts, mount_all);
283 if (strcmp(filesystemType, "auto") == 0) {
288 f = fopen("/etc/filesystems", "r");
291 while (fgets(buf, sizeof(buf), f)) {
294 } else if (*buf == '#') {
297 filesystemType = buf;
299 /* Add NULL termination to each line */
300 while (*filesystemType && !isspace(*filesystemType)) {
303 *filesystemType = '\0';
305 filesystemType = buf;
307 if (xstrlen(filesystemType)) {
309 do_mount(blockDevice, directory, filesystemType,
310 flags | MS_MGC_VAL, string_flags,
311 useMtab, fakeIt, mtab_opts, mount_all);
322 if ((!f || read_proc) && !status) {
323 f = xfopen("/proc/filesystems", "r");
325 while (fgets(buf, sizeof(buf), f) != NULL) {
326 filesystemType = buf;
327 if (*filesystemType == '\t') { /* Not a nodev filesystem */
329 /* Add NULL termination to each line */
330 while (*filesystemType && *filesystemType != '\n') {
333 *filesystemType = '\0';
335 filesystemType = buf;
336 filesystemType++; /* hop past tab */
339 do_mount(blockDevice, directory, filesystemType,
340 flags | MS_MGC_VAL, string_flags, useMtab,
341 fakeIt, mtab_opts, mount_all);
353 do_mount(blockDevice, directory, filesystemType,
354 flags | MS_MGC_VAL, string_flags, useMtab, fakeIt,
355 mtab_opts, mount_all);
360 perror_msg("Mounting %s on %s failed", blockDevice, directory);
367 static void show_mounts(char *onlytype)
369 #if defined CONFIG_FEATURE_USE_DEVPS_PATCH
370 int fd, i, numfilesystems;
371 char device[] = "/dev/mtab";
372 struct k_mntent *mntentlist;
375 fd = open(device, O_RDONLY);
377 perror_msg_and_die("open failed for `%s'", device);
380 /* How many mounted filesystems? We need to know to
381 * allocate enough space for later... */
382 numfilesystems = ioctl(fd, DEVMTAB_COUNT_MOUNTS);
383 if (numfilesystems < 0) {
384 perror_msg_and_die("\nDEVMTAB_COUNT_MOUNTS");
387 (struct k_mntent *) xcalloc(numfilesystems, sizeof(struct k_mntent));
389 /* Grab the list of mounted filesystems */
390 if (ioctl(fd, DEVMTAB_GET_MOUNTS, mntentlist) < 0) {
391 perror_msg_and_die("\nDEVMTAB_GET_MOUNTS");
394 for (i = 0; i < numfilesystems; i++) {
395 if (!onlytype || (strcmp(mntentlist[i].mnt_type, onlytype) == 0)) {
396 printf("%s %s %s %s %d %d\n", mntentlist[i].mnt_fsname,
397 mntentlist[i].mnt_dir, mntentlist[i].mnt_type,
398 mntentlist[i].mnt_opts, mntentlist[i].mnt_freq,
399 mntentlist[i].mnt_passno);
402 #ifdef CONFIG_FEATURE_CLEAN_UP
403 /* Don't bother to close files or free memory. Exit
404 * does that automagically, so we can save a few bytes */
410 FILE *mountTable = setmntent(mtab_file, "r");
415 while ((m = getmntent(mountTable)) != 0) {
416 char *blockDevice = m->mnt_fsname;
418 if (strcmp(blockDevice, "/dev/root") == 0) {
419 blockDevice = find_real_root_device_name(blockDevice);
421 if (!onlytype || (strcmp(m->mnt_type, onlytype) == 0)) {
422 printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
423 m->mnt_type, m->mnt_opts);
425 #ifdef CONFIG_FEATURE_CLEAN_UP
426 if (blockDevice != m->mnt_fsname) {
431 endmntent(mountTable);
433 perror_msg_and_die("%s", mtab_file);
439 extern int mount_main(int argc, char **argv)
442 char *string_flags = xstrdup("");
445 char *filesystemType = "auto";
446 int got_filesystemType = 0;
447 char *device = xmalloc(PATH_MAX);
448 char *directory = xmalloc(PATH_MAX);
449 struct mntent *m = NULL;
453 int rc = EXIT_FAILURE;
458 while ((opt = getopt(argc, argv, "o:rt:wafnv")) > 0) {
461 parse_mount_options(optarg, &flags, &string_flags);
467 filesystemType = optarg;
468 got_filesystemType = 1;
479 #ifdef CONFIG_FEATURE_MTAB_SUPPORT
485 break; /* ignore -v */
489 if (!all && (optind == argc)) {
490 show_mounts(got_filesystemType ? filesystemType : NULL);
494 /* if device is a filename get its real path */
495 if (stat(argv[optind], &statbuf) == 0) {
496 char *tmp = simplify_path(argv[optind]);
498 safe_strncpy(device, tmp, PATH_MAX);
500 safe_strncpy(device, argv[optind], PATH_MAX);
504 if (optind + 1 < argc)
505 directory = simplify_path(argv[optind + 1]);
507 if (all || optind + 1 == argc) {
508 f = setmntent("/etc/fstab", "r");
511 perror_msg_and_die("\nCannot read /etc/fstab");
513 while ((m = getmntent(f)) != NULL) {
514 if (!all && (optind + 1 == argc)
515 && ((strcmp(device, m->mnt_fsname) != 0)
516 && (strcmp(device, m->mnt_dir) != 0))) {
520 if (all && ( /* If we're mounting 'all' */
521 (strstr(m->mnt_opts, "noauto")) || /* and the file system isn't noauto, */
522 (strstr(m->mnt_type, "swap")) || /* and isn't swap or nfs, then mount it */
523 (strstr(m->mnt_type, "nfs")))) {
527 if (all || flags == 0) { /* Allow single mount to override fstab flags */
530 parse_mount_options(m->mnt_opts, &flags, &string_flags);
533 strcpy(device, m->mnt_fsname);
534 strcpy(directory, m->mnt_dir);
535 filesystemType = xstrdup(m->mnt_type);
537 extra_opts = string_flags;
539 #ifdef CONFIG_NFSMOUNT
540 if (strchr(device, ':') != NULL) {
541 filesystemType = "nfs";
543 (device, directory, &flags, &extra_opts, &string_flags,
545 perror_msg("nfsmount failed");
551 (device, directory, filesystemType, flags, string_flags,
552 useMtab, fakeIt, extra_opts, TRUE, all)) {
562 if (!all && f && m == NULL) {
563 fprintf(stderr, "Can't find %s in /etc/fstab\n", device);