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 static const char mount_usage[] = "Usage:\tmount [flags]\n"
45 "\tmount [flags] device directory [-o options,more-options]\n"
48 "\t-a:\tMount all file systems in fstab.\n"
49 "\t-o option:\tOne of many filesystem options, listed below.\n"
50 "\t-r:\tMount the filesystem read-only.\n"
51 "\t-t filesystem-type:\tSpecify the filesystem type.\n"
52 "\t-w:\tMount for reading and writing (default).\n"
54 "Options for use with the \"-o\" flag:\n"
55 "\tasync / sync:\tWrites are asynchronous / synchronous.\n"
56 "\tdev / nodev:\tAllow use of special device files / disallow them.\n"
57 "\texec / noexec:\tAllow use of executable files / disallow them.\n"
58 "\tsuid / nosuid:\tAllow set-user-id-root programs / disallow them.\n"
59 "\tremount: Re-mount a currently-mounted filesystem, changing its flags.\n"
60 "\tro / rw: Mount for read-only / read-write.\n"
62 "There are EVEN MORE flags that are specific to each filesystem.\n"
63 "You'll have to see the written documentation for those.\n";
65 struct mount_options {
71 static const struct mount_options mount_options[] = {
72 {"async", ~MS_SYNCHRONOUS, 0},
74 {"dev", ~MS_NODEV, 0},
75 {"exec", ~MS_NOEXEC, 0},
76 {"nodev", ~0, MS_NODEV},
77 {"noexec", ~0, MS_NOEXEC},
78 {"nosuid", ~0, MS_NOSUID},
79 {"remount", ~0, MS_REMOUNT},
80 {"ro", ~0, MS_RDONLY},
81 {"rw", ~MS_RDONLY, 0},
82 {"suid", ~MS_NOSUID, 0},
83 {"sync", ~0, MS_SYNCHRONOUS},
88 /* Seperate standard mount options from the nonstandard string options */
90 parse_mount_options ( char *options, unsigned long *flags, char *strflags)
94 char *comma = strchr (options, ',');
95 const struct mount_options* f = mount_options;
99 while (f->name != 0) {
100 if (strcasecmp (f->name, options) == 0) {
108 if (*strflags && strflags!= '\0' && gotone==FALSE) {
110 temp += strlen (strflags);
115 strcat (strflags, options);
129 char *blockDevice, char *directory, char *filesystemType,
130 unsigned long flags, char *string_flags)
136 if (strcmp(filesystemType, "auto") == 0) {
137 FILE *f = fopen ("/proc/filesystems", "r");
142 while (fgets (buf, sizeof (buf), f) != NULL) {
143 filesystemType = buf;
144 if (*filesystemType == '\t') { // Not a nodev filesystem
146 // Add NULL termination to each line
147 while (*filesystemType && *filesystemType != '\n')
149 *filesystemType = '\0';
151 filesystemType = buf;
152 filesystemType++; // hop past tab
154 status = mount (blockDevice, directory, filesystemType,
155 flags | MS_MGC_VAL, string_flags);
162 status = mount (blockDevice, directory, filesystemType,
163 flags | MS_MGC_VAL, string_flags);
167 fprintf (stderr, "Mounting %s on %s failed: %s\n",
168 blockDevice, directory, strerror(errno));
174 extern int mount_main (int argc, char **argv)
176 char string_flags[1024]="";
177 unsigned long flags = 0;
178 char *filesystemType = "auto";
180 char *directory = NULL;
185 if (stat("/etc/fstab", &statBuf) < 0)
186 fprintf(stderr, "/etc/fstab file missing -- Please install one.\n\n");
190 if ((mountTable = setmntent ("/proc/mounts", "r"))) {
192 while ((m = getmntent (mountTable)) != 0) {
193 struct fstab* fstabItem;
194 char *blockDevice = m->mnt_fsname;
195 /* Note that if /etc/fstab is missing, libc can't fix up /dev/root for us */
196 if (strcmp (blockDevice, "/dev/root") == 0) {
197 fstabItem = getfsfile ("/");
198 if (fstabItem != NULL)
199 blockDevice = fstabItem->fs_spec;
201 printf ("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
202 m->mnt_type, m->mnt_opts);
204 endmntent (mountTable);
213 while (i > 0 && **argv) {
215 while (i>0 && *++(*argv)) switch (**argv) {
218 fprintf (stderr, "%s\n", mount_usage);
221 parse_mount_options (*(++argv), &flags, string_flags);
230 fprintf (stderr, "%s\n", mount_usage);
233 filesystemType = *(++argv);
246 fprintf (stderr, "%s\n", mount_usage);
253 else if (directory == NULL)
256 fprintf (stderr, "%s\n", mount_usage);
266 FILE *f = setmntent ("/etc/fstab", "r");
269 perror("/etc/fstab");
272 while ((m = getmntent (f)) != NULL) {
273 // If the file system isn't noauto, and isn't mounted on /, mount
275 if ((!strstr (m->mnt_opts, "noauto"))
276 && (m->mnt_dir[1] != '\0') && !((m->mnt_type[0] == 's')
277 && (m->mnt_type[1] == 'w'))
278 && !((m->mnt_type[0] == 'n') && (m->mnt_type[1] == 'f'))) {
279 mount_one (m->mnt_fsname, m->mnt_dir, m->mnt_type, flags,
285 if (device && directory) {
286 exit (mount_one (device, directory, filesystemType,
287 flags, string_flags));
289 fprintf (stderr, "%s\n", mount_usage);