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.
46 #include <sys/mount.h>
48 #if defined BB_FEATURE_USE_DEVPS_PATCH
49 #include <linux/devmtab.h>
53 #if defined BB_FEATURE_MOUNT_LOOP
55 #include <sys/ioctl.h>
56 #include <linux/loop.h>
59 static int use_loop = FALSE;
62 extern const char mtab_file[]; /* Defined in utility.c */
64 static const char mount_usage[] = "\tmount [flags]\n"
65 "\tmount [flags] device directory [-o options,more-options]\n"
66 "\n" "Flags:\n" "\t-a:\tMount all file systems in fstab.\n"
68 "\t-f:\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
69 "\t-n:\tDon't write a mount table entry.\n"
71 "\t-o option:\tOne of many filesystem options, listed below.\n"
72 "\t-r:\tMount the filesystem read-only.\n"
73 "\t-t filesystem-type:\tSpecify the filesystem type.\n"
74 "\t-w:\tMount for reading and writing (default).\n"
76 "Options for use with the \"-o\" flag:\n"
77 "\tasync / sync:\tWrites are asynchronous / synchronous.\n"
78 "\tdev / nodev:\tAllow use of special device files / disallow them.\n"
79 "\texec / noexec:\tAllow use of executable files / disallow them.\n"
80 #if defined BB_FEATURE_MOUNT_LOOP
81 "\tloop: Mounts a file via loop device.\n"
83 "\tsuid / nosuid:\tAllow set-user-id-root programs / disallow them.\n"
84 "\tremount: Re-mount a currently-mounted filesystem, changing its flags.\n"
85 "\tro / rw: Mount for read-only / read-write.\n"
88 "There are EVEN MORE flags that are specific to each filesystem.\n"
89 "You'll have to see the written documentation for those.\n";
92 struct mount_options {
98 static const struct mount_options mount_options[] = {
99 {"async", ~MS_SYNCHRONOUS, 0},
101 {"dev", ~MS_NODEV, 0},
102 {"exec", ~MS_NOEXEC, 0},
103 {"nodev", ~0, MS_NODEV},
104 {"noexec", ~0, MS_NOEXEC},
105 {"nosuid", ~0, MS_NOSUID},
106 {"remount", ~0, MS_REMOUNT},
107 {"ro", ~0, MS_RDONLY},
108 {"rw", ~MS_RDONLY, 0},
109 {"suid", ~MS_NOSUID, 0},
110 {"sync", ~0, MS_SYNCHRONOUS},
115 do_mount(char *specialfile, char *dir, char *filesystemtype,
116 long flags, void *string_flags, int useMtab, int fakeIt,
126 #if defined BB_FEATURE_MOUNT_LOOP
127 if (use_loop==TRUE) {
128 int loro = flags & MS_RDONLY;
129 char *lofile = specialfile;
131 specialfile = find_unused_loop_device();
132 if (specialfile == NULL) {
133 fprintf(stderr, "Could not find a spare loop device\n");
136 if (set_loop(specialfile, lofile, 0, &loro)) {
137 fprintf(stderr, "Could not setup loop device\n");
140 if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
141 fprintf(stderr, "WARNING: loop device is read-only\n");
147 mount(specialfile, dir, filesystemtype, flags, string_flags);
151 /* If the mount was sucessful, do anything needed, then return TRUE */
155 if (useMtab == TRUE) {
156 write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
162 /* Bummer. mount failed. Clean up */
163 #if defined BB_FEATURE_MOUNT_LOOP
164 if (lofile != NULL) {
165 del_loop(specialfile);
173 /* Seperate standard mount options from the nonstandard string options */
175 parse_mount_options(char *options, unsigned long *flags, char *strflags)
179 char *comma = strchr(options, ',');
180 const struct mount_options *f = mount_options;
185 while (f->name != 0) {
186 if (strcasecmp(f->name, options) == 0) {
195 #if defined BB_FEATURE_MOUNT_LOOP
196 if (gotone == FALSE && !strcasecmp("loop", options)) { /* loop device support */
201 if (*strflags && strflags != '\0' && gotone == FALSE) {
202 char *temp = strflags;
204 temp += strlen(strflags);
209 strcat(strflags, options);
220 mount_one(char *blockDevice, char *directory, char *filesystemType,
221 unsigned long flags, char *string_flags, int useMtab, int fakeIt,
222 char *mtab_opts, int whineOnErrors)
226 #if defined BB_FEATURE_USE_PROCFS
228 if (strcmp(filesystemType, "auto") == 0) {
229 FILE *f = fopen("/proc/filesystems", "r");
234 while (fgets(buf, sizeof(buf), f) != NULL) {
235 filesystemType = buf;
236 if (*filesystemType == '\t') { // Not a nodev filesystem
238 // Add NULL termination to each line
239 while (*filesystemType && *filesystemType != '\n')
241 *filesystemType = '\0';
243 filesystemType = buf;
244 filesystemType++; // hop past tab
246 status = do_mount(blockDevice, directory, filesystemType,
247 flags | MS_MGC_VAL, string_flags,
248 useMtab, fakeIt, mtab_opts);
256 #if defined BB_FEATURE_USE_DEVPS_PATCH
257 if (strcmp(filesystemType, "auto") == 0) {
258 int fd, i, numfilesystems;
259 char device[] = "/dev/mtab";
260 struct k_fstype *fslist;
263 fd = open(device, O_RDONLY);
265 fatalError("open failed for `%s': %s\n", device, strerror (errno));
267 /* How many filesystems? We need to know to allocate enough space */
268 numfilesystems = ioctl (fd, DEVMTAB_COUNT_FILESYSTEMS);
269 if (numfilesystems<0)
270 fatalError("\nDEVMTAB_COUNT_FILESYSTEMS: %s\n", strerror (errno));
271 fslist = (struct k_fstype *) calloc ( numfilesystems, sizeof(struct k_fstype));
273 /* Grab the list of available filesystems */
274 status = ioctl (fd, DEVMTAB_GET_FILESYSTEMS, fslist);
276 fatalError("\nDEVMTAB_GET_FILESYSTEMS: %s\n", strerror (errno));
278 /* Walk the list trying to mount filesystems
279 * that do not claim to be nodev filesystems */
280 for( i = 0 ; i < numfilesystems ; i++) {
281 if (fslist[i].mnt_nodev)
283 status = do_mount(blockDevice, directory, fslist[i].mnt_type,
284 flags | MS_MGC_VAL, string_flags,
285 useMtab, fakeIt, mtab_opts);
294 status = do_mount(blockDevice, directory, filesystemType,
295 flags | MS_MGC_VAL, string_flags, useMtab,
299 if (status == FALSE && whineOnErrors == TRUE) {
300 if (whineOnErrors == TRUE) {
301 fprintf(stderr, "Mounting %s on %s failed: %s\n",
302 blockDevice, directory, strerror(errno));
309 extern int mount_main(int argc, char **argv)
311 char string_flags_buf[1024] = "";
312 char *string_flags = string_flags_buf;
313 char *extra_opts = string_flags_buf;
314 unsigned long flags = 0;
315 char *filesystemType = "auto";
317 char *directory = NULL;
323 #if defined BB_FEATURE_USE_DEVPS_PATCH
325 int fd, i, numfilesystems;
326 char device[] = "/dev/mtab";
327 struct k_mntent *mntentlist;
330 fd = open(device, O_RDONLY);
332 fatalError("open failed for `%s': %s\n", device, strerror (errno));
334 /* How many mounted filesystems? We need to know to
335 * allocate enough space for later... */
336 numfilesystems = ioctl (fd, DEVMTAB_COUNT_MOUNTS);
337 if (numfilesystems<0)
338 fatalError( "\nDEVMTAB_COUNT_MOUNTS: %s\n", strerror (errno));
339 mntentlist = (struct k_mntent *) calloc ( numfilesystems, sizeof(struct k_mntent));
341 /* Grab the list of mounted filesystems */
342 if (ioctl (fd, DEVMTAB_GET_MOUNTS, mntentlist)<0)
343 fatalError( "\nDEVMTAB_GET_MOUNTS: %s\n", strerror (errno));
345 for( i = 0 ; i < numfilesystems ; i++) {
346 fprintf( stdout, "%s %s %s %s %d %d\n", mntentlist[i].mnt_fsname,
347 mntentlist[i].mnt_dir, mntentlist[i].mnt_type,
348 mntentlist[i].mnt_opts, mntentlist[i].mnt_freq,
349 mntentlist[i].mnt_passno);
351 /* Don't bother to close files or free memory. Exit
352 * does that automagically, so we can save a few bytes */
361 FILE *mountTable = setmntent(mtab_file, "r");
366 while ((m = getmntent(mountTable)) != 0) {
367 char *blockDevice = m->mnt_fsname;
368 if (strcmp(blockDevice, "/dev/root") == 0) {
369 find_real_root_device_name( blockDevice);
371 printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
372 m->mnt_type, m->mnt_opts);
374 endmntent(mountTable);
385 while (i > 0 && **argv) {
389 while (i > 0 && *++opt)
395 parse_mount_options(*(++argv), &flags, string_flags);
404 filesystemType = *(++argv);
421 break; /* ignore -v */
429 else if (directory == NULL)
441 FILE *f = setmntent("/etc/fstab", "r");
444 fatalError( "\nCannot read /etc/fstab: %s\n", strerror (errno));
446 while ((m = getmntent(f)) != NULL) {
447 // If the file system isn't noauto,
448 // and isn't swap or nfs, then mount it
449 if ((!strstr(m->mnt_opts, "noauto")) &&
450 (!strstr(m->mnt_type, "swap")) &&
451 (!strstr(m->mnt_type, "nfs"))) {
453 *string_flags = '\0';
454 parse_mount_options(m->mnt_opts, &flags, string_flags);
455 /* If the directory is /, try to remount
456 * with the options specified in fstab */
457 if (m->mnt_dir[0] == '/' && m->mnt_dir[1] == '\0') {
460 if (mount_one(m->mnt_fsname, m->mnt_dir, m->mnt_type,
461 flags, string_flags, useMtab, fakeIt,
464 /* Try again, but this time try a remount */
465 mount_one(m->mnt_fsname, m->mnt_dir, m->mnt_type,
466 flags|MS_REMOUNT, string_flags, useMtab, fakeIt,
473 if (device && directory) {
475 if (strcmp(filesystemType, "nfs") == 0) {
477 (device, directory, &flags, &extra_opts, &string_flags,
482 exit(mount_one(device, directory, filesystemType,
483 flags, string_flags, useMtab, fakeIt,