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.
47 #if defined BB_FEATURE_USE_DEVPS_PATCH
48 #include <linux/devmtab.h> /* For Erik's nifty devmtab device driver */
52 #define MS_MGC_VAL 0xc0ed0000 /* Magic number indicatng "new" flags */
53 #define MS_RDONLY 1 /* Mount read-only */
54 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
55 #define MS_NODEV 4 /* Disallow access to device special files */
56 #define MS_NOEXEC 8 /* Disallow program execution */
57 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
58 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
59 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
60 #define S_QUOTA 128 /* Quota initialized for file/directory/symlink */
61 #define S_APPEND 256 /* Append-only file */
62 #define S_IMMUTABLE 512 /* Immutable file */
63 #define MS_NOATIME 1024 /* Do not update access times. */
64 #define MS_NODIRATIME 2048 /* Do not update directory access times */
68 #if defined BB_FEATURE_MOUNT_LOOP
70 #include <sys/ioctl.h>
71 static int use_loop = FALSE;
74 extern int mount (__const char *__special_file, __const char *__dir,
75 __const char *__fstype, unsigned long int __rwflag,
76 __const void *__data);
77 extern int umount (__const char *__special_file);
78 extern int umount2 (__const char *__special_file, int __flags);
81 extern const char mtab_file[]; /* Defined in utility.c */
83 struct mount_options {
89 static const struct mount_options mount_options[] = {
90 {"async", ~MS_SYNCHRONOUS, 0},
91 {"atime", ~0, ~MS_NOATIME},
93 {"dev", ~MS_NODEV, 0},
94 {"diratime", ~0, ~MS_NODIRATIME},
95 {"exec", ~MS_NOEXEC, 0},
96 {"noatime", ~0, MS_NOATIME},
97 {"nodev", ~0, MS_NODEV},
98 {"nodiratime", ~0, MS_NODIRATIME},
99 {"noexec", ~0, MS_NOEXEC},
100 {"nosuid", ~0, MS_NOSUID},
101 {"remount", ~0, MS_REMOUNT},
102 {"ro", ~0, MS_RDONLY},
103 {"rw", ~MS_RDONLY, 0},
104 {"suid", ~MS_NOSUID, 0},
105 {"sync", ~0, MS_SYNCHRONOUS},
110 do_mount(char *specialfile, char *dir, char *filesystemtype,
111 long flags, void *string_flags, int useMtab, int fakeIt,
121 #if defined BB_FEATURE_MOUNT_LOOP
122 if (use_loop==TRUE) {
123 int loro = flags & MS_RDONLY;
124 char *lofile = specialfile;
126 specialfile = find_unused_loop_device();
127 if (specialfile == NULL) {
128 errorMsg("Could not find a spare loop device\n");
131 if (set_loop(specialfile, lofile, 0, &loro)) {
132 errorMsg("Could not setup loop device\n");
135 if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
136 errorMsg("WARNING: loop device is read-only\n");
141 status = mount(specialfile, dir, filesystemtype, flags, string_flags);
145 /* If the mount was sucessful, do anything needed, then return TRUE */
149 if (useMtab == TRUE) {
150 write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
156 /* Bummer. mount failed. Clean up */
157 #if defined BB_FEATURE_MOUNT_LOOP
158 if (lofile != NULL) {
159 del_loop(specialfile);
163 if (errno == EPERM) {
164 fatalError("permission denied. Are you root?\n");
172 /* Seperate standard mount options from the nonstandard string options */
174 parse_mount_options(char *options, int *flags, char *strflags)
178 char *comma = strchr(options, ',');
179 const struct mount_options *f = mount_options;
184 while (f->name != 0) {
185 if (strcasecmp(f->name, options) == 0) {
194 #if defined BB_FEATURE_MOUNT_LOOP
195 if (gotone == FALSE && !strcasecmp("loop", options)) { /* loop device support */
200 if (*strflags && strflags != '\0' && gotone == FALSE) {
201 char *temp = strflags;
203 temp += strlen(strflags);
208 strcat(strflags, options);
219 mount_one(char *blockDevice, char *directory, char *filesystemType,
220 unsigned long flags, char *string_flags, int useMtab, int fakeIt,
221 char *mtab_opts, int whineOnErrors)
225 #if defined BB_FEATURE_USE_PROCFS
227 if (strcmp(filesystemType, "auto") == 0) {
228 FILE *f = fopen("/proc/filesystems", "r");
233 while (fgets(buf, sizeof(buf), f) != NULL) {
234 filesystemType = buf;
235 if (*filesystemType == '\t') { // Not a nodev filesystem
237 // Add NULL termination to each line
238 while (*filesystemType && *filesystemType != '\n')
240 *filesystemType = '\0';
242 filesystemType = buf;
243 filesystemType++; // hop past tab
245 status = do_mount(blockDevice, directory, filesystemType,
246 flags | MS_MGC_VAL, string_flags,
247 useMtab, fakeIt, mtab_opts);
255 #if defined BB_FEATURE_USE_DEVPS_PATCH
256 if (strcmp(filesystemType, "auto") == 0) {
257 int fd, i, numfilesystems;
258 char device[] = "/dev/mtab";
259 struct k_fstype *fslist;
262 fd = open(device, O_RDONLY);
264 fatalError("open failed for `%s': %s\n", device, strerror (errno));
266 /* How many filesystems? We need to know to allocate enough space */
267 numfilesystems = ioctl (fd, DEVMTAB_COUNT_FILESYSTEMS);
268 if (numfilesystems<0)
269 fatalError("\nDEVMTAB_COUNT_FILESYSTEMS: %s\n", strerror (errno));
270 fslist = (struct k_fstype *) calloc ( numfilesystems, sizeof(struct k_fstype));
272 /* Grab the list of available filesystems */
273 status = ioctl (fd, DEVMTAB_GET_FILESYSTEMS, fslist);
275 fatalError("\nDEVMTAB_GET_FILESYSTEMS: %s\n", strerror (errno));
277 /* Walk the list trying to mount filesystems
278 * that do not claim to be nodev filesystems */
279 for( i = 0 ; i < numfilesystems ; i++) {
280 if (fslist[i].mnt_nodev)
282 status = do_mount(blockDevice, directory, fslist[i].mnt_type,
283 flags | MS_MGC_VAL, string_flags,
284 useMtab, fakeIt, mtab_opts);
293 status = do_mount(blockDevice, directory, filesystemType,
294 flags | MS_MGC_VAL, string_flags, useMtab,
298 if (status == FALSE) {
299 if (whineOnErrors == TRUE) {
300 errorMsg("Mounting %s on %s failed: %s\n",
301 blockDevice, directory, strerror(errno));
308 extern int mount_main(int argc, char **argv)
310 char string_flags_buf[1024] = "";
311 char *string_flags = string_flags_buf;
312 char *extra_opts = string_flags_buf;
314 char *filesystemType = "auto";
316 char *directory = NULL;
322 #if defined BB_FEATURE_USE_DEVPS_PATCH
324 int fd, i, numfilesystems;
325 char device[] = "/dev/mtab";
326 struct k_mntent *mntentlist;
329 fd = open(device, O_RDONLY);
331 fatalError("open failed for `%s': %s\n", device, strerror (errno));
333 /* How many mounted filesystems? We need to know to
334 * allocate enough space for later... */
335 numfilesystems = ioctl (fd, DEVMTAB_COUNT_MOUNTS);
336 if (numfilesystems<0)
337 fatalError( "\nDEVMTAB_COUNT_MOUNTS: %s\n", strerror (errno));
338 mntentlist = (struct k_mntent *) calloc ( numfilesystems, sizeof(struct k_mntent));
340 /* Grab the list of mounted filesystems */
341 if (ioctl (fd, DEVMTAB_GET_MOUNTS, mntentlist)<0)
342 fatalError( "\nDEVMTAB_GET_MOUNTS: %s\n", strerror (errno));
344 for( i = 0 ; i < numfilesystems ; i++) {
345 fprintf( stdout, "%s %s %s %s %d %d\n", mntentlist[i].mnt_fsname,
346 mntentlist[i].mnt_dir, mntentlist[i].mnt_type,
347 mntentlist[i].mnt_opts, mntentlist[i].mnt_freq,
348 mntentlist[i].mnt_passno);
350 /* Don't bother to close files or free memory. Exit
351 * does that automagically, so we can save a few bytes */
360 FILE *mountTable = setmntent(mtab_file, "r");
365 while ((m = getmntent(mountTable)) != 0) {
366 char *blockDevice = m->mnt_fsname;
367 if (strcmp(blockDevice, "/dev/root") == 0) {
368 find_real_root_device_name( blockDevice);
370 printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
371 m->mnt_type, m->mnt_opts);
373 endmntent(mountTable);
384 while (i > 0 && **argv) {
388 while (i > 0 && *++opt)
394 parse_mount_options(*(++argv), &flags, string_flags);
403 filesystemType = *(++argv);
420 break; /* ignore -v */
428 else if (directory == NULL)
440 FILE *f = setmntent("/etc/fstab", "r");
443 fatalError( "\nCannot read /etc/fstab: %s\n", strerror (errno));
445 while ((m = getmntent(f)) != NULL) {
446 // If the filesystem isn't noauto,
447 // and isn't swap or nfs, then mount it
448 if ((!strstr(m->mnt_opts, "noauto")) &&
449 (!strstr(m->mnt_type, "swap")) &&
450 (!strstr(m->mnt_type, "nfs"))) {
452 *string_flags = '\0';
453 parse_mount_options(m->mnt_opts, &flags, string_flags);
454 if (mount_one(m->mnt_fsname, m->mnt_dir, m->mnt_type,
455 flags, string_flags, useMtab, fakeIt,
456 extra_opts, FALSE)==FALSE)
458 /* Try again, but this time try a remount */
459 mount_one(m->mnt_fsname, m->mnt_dir, m->mnt_type,
460 flags|MS_REMOUNT, string_flags, useMtab, fakeIt,
467 if (device && directory) {
469 if (strchr(device, ':') != NULL)
470 filesystemType = "nfs";
471 if (strcmp(filesystemType, "nfs") == 0) {
473 ret = nfsmount (device, directory, &flags,
474 &extra_opts, &string_flags, 1);
476 fatalError("nfsmount failed: %s\n", strerror(errno));
479 exit(mount_one(device, directory, filesystemType,
480 flags, string_flags, useMtab, fakeIt,