2 * Mini mount implementation for busybox
4 * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * 3/21/1999 Charles P. Wright <cpwright@cpwright.com>
21 * searches through fstab when -a is passed
22 * will try mounting stuff with all fses when passed -t auto
24 * 1999-04-17 Dave Cinege...Rewrote -t auto. Fixed ro mtab.
26 * 1999-10-07 Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
27 * Rewrote of a lot of code. Removed mtab usage (I plan on
28 * putting it back as a compile-time option some time),
29 * major adjustments to option parsing, and some serious
40 #include <sys/mount.h>
44 extern const char mtab_file[]; /* Defined in utility.c */
46 static const char mount_usage[] = "\tmount [flags]\n"
47 "\tmount [flags] device directory [-o options,more-options]\n"
50 "\t-a:\tMount all file systems in fstab.\n"
52 "\t-f:\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
53 "\t-n:\tDon't write a mount table entry.\n"
55 "\t-o option:\tOne of many filesystem options, listed below.\n"
56 "\t-r:\tMount the filesystem read-only.\n"
57 "\t-t filesystem-type:\tSpecify the filesystem type.\n"
58 "\t-w:\tMount for reading and writing (default).\n"
60 "Options for use with the \"-o\" flag:\n"
61 "\tasync / sync:\tWrites are asynchronous / synchronous.\n"
62 "\tdev / nodev:\tAllow use of special device files / disallow them.\n"
63 "\texec / noexec:\tAllow use of executable files / disallow them.\n"
64 "\tsuid / nosuid:\tAllow set-user-id-root programs / disallow them.\n"
65 "\tremount: Re-mount a currently-mounted filesystem, changing its flags.\n"
66 "\tro / rw: Mount for read-only / read-write.\n"
68 "There are EVEN MORE flags that are specific to each filesystem.\n"
69 "You'll have to see the written documentation for those.\n";
72 struct mount_options {
78 static const struct mount_options mount_options[] = {
79 {"async", ~MS_SYNCHRONOUS, 0},
81 {"dev", ~MS_NODEV, 0},
82 {"exec", ~MS_NOEXEC, 0},
83 {"nodev", ~0, MS_NODEV},
84 {"noexec", ~0, MS_NOEXEC},
85 {"nosuid", ~0, MS_NOSUID},
86 {"remount", ~0, MS_REMOUNT},
87 {"ro", ~0, MS_RDONLY},
88 {"rw", ~MS_RDONLY, 0},
89 {"suid", ~MS_NOSUID, 0},
90 {"sync", ~0, MS_SYNCHRONOUS},
95 #define do_mount(specialfile, dir, filesystemtype, flags, string_flags, useMtab, fakeIt, mtab_opts) \
96 mount(specialfile, dir, filesystemtype, flags, string_flags)
99 do_mount(char* specialfile, char* dir, char* filesystemtype,
100 long flags, void* string_flags, int useMtab, int fakeIt, char* mtab_opts)
105 status=mount(specialfile, dir, filesystemtype, flags, string_flags);
109 write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
118 /* Seperate standard mount options from the nonstandard string options */
120 parse_mount_options ( char *options, unsigned long *flags, char *strflags)
124 char *comma = strchr (options, ',');
125 const struct mount_options* f = mount_options;
129 while (f->name != 0) {
130 if (strcasecmp (f->name, options) == 0) {
139 if (*strflags && strflags!= '\0' && gotone==FALSE) {
141 temp += strlen (strflags);
146 strcat (strflags, options);
159 mount_one(char *blockDevice, char *directory, char *filesystemType,
160 unsigned long flags, char *string_flags, int useMtab, int fakeIt, char *mtab_opts)
166 #if defined BB_FEATURE_USE_PROCFS
167 if (strcmp(filesystemType, "auto") == 0) {
168 FILE *f = fopen ("/proc/filesystems", "r");
173 while (fgets (buf, sizeof (buf), f) != NULL) {
174 filesystemType = buf;
175 if (*filesystemType == '\t') { // Not a nodev filesystem
177 // Add NULL termination to each line
178 while (*filesystemType && *filesystemType != '\n')
180 *filesystemType = '\0';
182 filesystemType = buf;
183 filesystemType++; // hop past tab
185 status = do_mount (blockDevice, directory, filesystemType,
186 flags | MS_MGC_VAL, string_flags, useMtab,
196 status = do_mount (blockDevice, directory, filesystemType,
197 flags | MS_MGC_VAL, string_flags, useMtab,
202 fprintf (stderr, "Mounting %s on %s failed: %s\n",
203 blockDevice, directory, strerror(errno));
209 extern int mount_main (int argc, char **argv)
211 char string_flags_buf[1024]="";
212 char *string_flags = string_flags_buf;
213 char *extra_opts = string_flags_buf;
214 unsigned long flags = 0;
215 char *filesystemType = "auto";
217 char *directory = NULL;
223 /* Only compiled in if BB_MTAB is not defined */
224 whine_if_fstab_is_missing();
227 FILE *mountTable = setmntent (mtab_file, "r");
230 while ((m = getmntent (mountTable)) != 0) {
231 struct fstab* fstabItem;
232 char *blockDevice = m->mnt_fsname;
233 /* Note that if /etc/fstab is missing, libc can't fix up /dev/root for us */
234 if (strcmp (blockDevice, "/dev/root") == 0) {
235 fstabItem = getfsfile ("/");
236 if (fstabItem != NULL)
237 blockDevice = fstabItem->fs_spec;
239 printf ("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
240 m->mnt_type, m->mnt_opts);
242 endmntent (mountTable);
253 while (i > 0 && **argv) {
256 while (i>0 && *++opt) switch (*opt) {
261 parse_mount_options (*(++argv), &flags, string_flags);
270 filesystemType = *(++argv);
294 else if (directory == NULL)
306 FILE *f = setmntent ("/etc/fstab", "r");
309 perror("/etc/fstab");
312 while ((m = getmntent (f)) != NULL) {
313 // If the file system isn't noauto, and isn't mounted on /,
314 // and isn't swap or nfs, then mount it
315 if ((!strstr (m->mnt_opts, "noauto")) &&
316 (m->mnt_dir[1] != '\0') &&
317 (!strstr (m->mnt_type, "swap")) &&
318 (!strstr (m->mnt_type, "nfs")))
321 *string_flags = '\0';
322 parse_mount_options(m->mnt_opts, &flags, string_flags);
323 mount_one (m->mnt_fsname, m->mnt_dir, m->mnt_type,
324 flags, string_flags, useMtab, fakeIt, extra_opts);
329 if (device && directory) {
331 if (strcmp(filesystemType, "nfs") == 0) {
332 if (nfsmount(device, directory, &flags, &extra_opts, &string_flags, 1) != 0)
336 exit (mount_one (device, directory, filesystemType,
337 flags, string_flags, useMtab, fakeIt, extra_opts));