2 * Mini mount implementation for busybox
4 * Copyright (C) 1999 by Erik Andersen <andersee@debian.org>
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.
25 * 1999-10-07 Erik Andersen. Rewrote of a lot of code. Removed mtab
26 * usage, major adjustments, and some serious dieting all around.
36 #include <sys/mount.h>
40 const char mount_usage[] = "Usage:\tmount [flags]\n"
41 "\tmount [flags] device directory [-o options,more-options]\n"
44 "\t-a:\tMount all file systems in fstab.\n"
45 "\t-o option:\tOne of many filesystem options, listed below.\n"
46 "\t-r:\tMount the filesystem read-only.\n"
47 "\t-t filesystem-type:\tSpecify the filesystem type.\n"
48 "\t-w:\tMount for reading and writing (default).\n"
50 "Options for use with the \"-o\" flag:\n"
51 "\tasync / sync:\tWrites are asynchronous / synchronous.\n"
52 "\tdev / nodev:\tAllow use of special device files / disallow them.\n"
53 "\texec / noexec:\tAllow use of executable files / disallow them.\n"
54 "\tsuid / nosuid:\tAllow set-user-id-root programs / disallow them.\n"
55 "\tremount: Re-mount a currently-mounted filesystem, changing its flags.\n"
56 "\tro / rw: Mount for read-only / read-write.\n"
58 "There are EVEN MORE flags that are specific to each filesystem.\n"
59 "You'll have to see the written documentation for those.\n";
61 struct mount_options {
67 static const struct mount_options mount_options[] = {
68 {"async", ~MS_SYNCHRONOUS, 0},
70 {"dev", ~MS_NODEV, 0},
71 {"exec", ~MS_NOEXEC, 0},
72 {"nodev", ~0, MS_NODEV},
73 {"noexec", ~0, MS_NOEXEC},
74 {"nosuid", ~0, MS_NOSUID},
75 {"remount", ~0, MS_REMOUNT},
76 {"ro", ~0, MS_RDONLY},
77 {"rw", ~MS_RDONLY, 0},
78 {"suid", ~MS_NOSUID, 0},
79 {"sync", ~0, MS_SYNCHRONOUS},
84 /* Seperate standard mount options from the nonstandard string options */
86 parse_mount_options ( char *options, unsigned long *flags, char *strflags)
90 char *comma = strchr (options, ',');
91 const struct mount_options* f = mount_options;
95 while (f->name != 0) {
96 if (strcasecmp (f->name, options) == 0) {
104 if (*strflags && strflags!= '\0' && gotone==FALSE) {
106 temp += strlen (strflags);
111 strcat (strflags, options);
125 char *blockDevice, char *directory, char *filesystemType,
126 unsigned long flags, char *string_flags)
132 if (strcmp(filesystemType, "auto") == 0) {
133 FILE *f = fopen ("/proc/filesystems", "r");
138 while (fgets (buf, sizeof (buf), f) != NULL) {
139 filesystemType = buf;
140 if (*filesystemType == '\t') { // Not a nodev filesystem
142 // Add NULL termination to each line
143 while (*filesystemType && *filesystemType != '\n')
145 *filesystemType = '\0';
147 filesystemType = buf;
148 filesystemType++; // hop past tab
150 status = mount (blockDevice, directory, filesystemType,
151 flags | MS_MGC_VAL, string_flags);
158 status = mount (blockDevice, directory, filesystemType,
159 flags | MS_MGC_VAL, string_flags);
163 fprintf (stderr, "Mounting %s on %s failed: %s\n",
164 blockDevice, directory, strerror(errno));
170 extern int mount_main (int argc, char **argv)
172 char string_flags[1024]="";
173 unsigned long flags = 0;
174 char *filesystemType = "auto";
176 char *directory = NULL;
181 if (stat("/etc/fstab", &statBuf) < 0)
182 fprintf(stderr, "/etc/fstab file missing -- Please install one.\n\n");
186 if ((mountTable = setmntent ("/proc/mounts", "r"))) {
188 while ((m = getmntent (mountTable)) != 0) {
189 struct fstab* fstabItem;
190 char *blockDevice = m->mnt_fsname;
191 /* Note that if /etc/fstab is missing, libc can't fix up /dev/root for us */
192 if (strcmp (blockDevice, "/dev/root") == 0) {
193 fstabItem = getfsfile ("/");
194 if (fstabItem != NULL)
195 blockDevice = fstabItem->fs_spec;
197 printf ("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
198 m->mnt_type, m->mnt_opts);
200 endmntent (mountTable);
209 while (i > 0 && **argv) {
211 while (i>0 && *++(*argv)) switch (**argv) {
214 fprintf (stderr, "%s\n", mount_usage);
217 parse_mount_options (*(++argv), &flags, string_flags);
226 fprintf (stderr, "%s\n", mount_usage);
229 filesystemType = *(++argv);
242 fprintf (stderr, "%s\n", mount_usage);
249 else if (directory == NULL)
252 fprintf (stderr, "%s\n", mount_usage);
262 FILE *f = setmntent ("/etc/fstab", "r");
265 perror("/etc/fstab");
268 while ((m = getmntent (f)) != NULL) {
269 // If the file system isn't noauto, and isn't mounted on /, mount
271 if ((!strstr (m->mnt_opts, "noauto"))
272 && (m->mnt_dir[1] != '\0') && !((m->mnt_type[0] == 's')
273 && (m->mnt_type[1] == 'w'))
274 && !((m->mnt_type[0] == 'n') && (m->mnt_type[1] == 'f'))) {
275 mount_one (m->mnt_fsname, m->mnt_dir, m->mnt_type, flags,
281 if (device && directory) {
282 exit (mount_one (device, directory, filesystemType,
283 flags, string_flags));
285 fprintf (stderr, "%s\n", mount_usage);