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>
56 #if defined BB_FEATURE_MOUNT_LOOP
58 #include <sys/ioctl.h>
59 #include <linux/loop.h>
62 static int use_loop = FALSE;
65 extern const char mtab_file[]; /* Defined in utility.c */
67 static const char mount_usage[] = "\tmount [flags]\n"
68 "\tmount [flags] device directory [-o options,more-options]\n"
69 "\n" "Flags:\n" "\t-a:\tMount all file systems in fstab.\n"
71 "\t-f:\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
72 "\t-n:\tDon't write a mount table entry.\n"
74 "\t-o option:\tOne of many filesystem options, listed below.\n"
75 "\t-r:\tMount the filesystem read-only.\n"
76 "\t-t filesystem-type:\tSpecify the filesystem type.\n"
77 "\t-w:\tMount for reading and writing (default).\n"
79 "Options for use with the \"-o\" flag:\n"
80 "\tasync / sync:\tWrites are asynchronous / synchronous.\n"
81 "\tdev / nodev:\tAllow use of special device files / disallow them.\n"
82 "\texec / noexec:\tAllow use of executable files / disallow them.\n"
83 #if defined BB_FEATURE_MOUNT_LOOP
84 "\tloop: Mounts a file via loop device.\n"
86 "\tsuid / nosuid:\tAllow set-user-id-root programs / disallow them.\n"
87 "\tremount: Re-mount a currently-mounted filesystem, changing its flags.\n"
88 "\tro / rw: Mount for read-only / read-write.\n"
89 "There are EVEN MORE flags that are specific to each filesystem.\n"
90 "You'll have to see the written documentation for those.\n";
93 struct mount_options {
99 static const struct mount_options mount_options[] = {
100 {"async", ~MS_SYNCHRONOUS, 0},
102 {"dev", ~MS_NODEV, 0},
103 {"exec", ~MS_NOEXEC, 0},
104 {"nodev", ~0, MS_NODEV},
105 {"noexec", ~0, MS_NOEXEC},
106 {"nosuid", ~0, MS_NOSUID},
107 {"remount", ~0, MS_REMOUNT},
108 {"ro", ~0, MS_RDONLY},
109 {"rw", ~MS_RDONLY, 0},
110 {"suid", ~MS_NOSUID, 0},
111 {"sync", ~0, MS_SYNCHRONOUS},
116 do_mount(char *specialfile, char *dir, char *filesystemtype,
117 long flags, void *string_flags, int useMtab, int fakeIt,
127 #if defined BB_FEATURE_MOUNT_LOOP
128 if (use_loop==TRUE) {
129 int loro = flags & MS_RDONLY;
130 char *lofile = specialfile;
132 specialfile = find_unused_loop_device();
133 if (specialfile == NULL) {
134 fprintf(stderr, "Could not find a spare loop device\n");
137 if (set_loop(specialfile, lofile, 0, &loro)) {
138 fprintf(stderr, "Could not setup loop device\n");
141 if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
142 fprintf(stderr, "WARNING: loop device is read-only\n");
148 mount(specialfile, dir, filesystemtype, flags, string_flags);
152 /* If the mount was sucessful, do anything needed, then return TRUE */
156 if (useMtab == TRUE) {
157 write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
163 /* Bummer. mount failed. Clean up */
164 #if defined BB_FEATURE_MOUNT_LOOP
165 if (lofile != NULL) {
166 del_loop(specialfile);
174 /* Seperate standard mount options from the nonstandard string options */
176 parse_mount_options(char *options, unsigned long *flags, char *strflags)
180 char *comma = strchr(options, ',');
181 const struct mount_options *f = mount_options;
186 while (f->name != 0) {
187 if (strcasecmp(f->name, options) == 0) {
196 #if defined BB_FEATURE_MOUNT_LOOP
197 if (gotone == FALSE && !strcasecmp("loop", options)) { /* loop device support */
202 if (*strflags && strflags != '\0' && gotone == FALSE) {
203 char *temp = strflags;
205 temp += strlen(strflags);
210 strcat(strflags, options);
221 mount_one(char *blockDevice, char *directory, char *filesystemType,
222 unsigned long flags, char *string_flags, int useMtab, int fakeIt,
223 char *mtab_opts, int whineOnErrors)
227 #if defined BB_FEATURE_USE_PROCFS
229 if (strcmp(filesystemType, "auto") == 0) {
230 FILE *f = fopen("/proc/filesystems", "r");
235 while (fgets(buf, sizeof(buf), f) != NULL) {
236 filesystemType = buf;
237 if (*filesystemType == '\t') { // Not a nodev filesystem
239 // Add NULL termination to each line
240 while (*filesystemType && *filesystemType != '\n')
242 *filesystemType = '\0';
244 filesystemType = buf;
245 filesystemType++; // hop past tab
247 status = do_mount(blockDevice, directory, filesystemType,
248 flags | MS_MGC_VAL, string_flags,
249 useMtab, fakeIt, mtab_opts);
257 #if defined BB_FEATURE_USE_DEVPS_PATCH
258 if (strcmp(filesystemType, "auto") == 0) {
259 int fd, i, numfilesystems;
260 char device[] = "/dev/mtab";
261 struct k_fstype *fslist;
264 fd = open(device, O_RDONLY);
266 fatalError("open failed for `%s': %s\n", device, strerror (errno));
268 /* How many filesystems? We need to know to allocate enough space */
269 numfilesystems = ioctl (fd, DEVMTAB_COUNT_FILESYSTEMS);
270 if (numfilesystems<0)
271 fatalError("\nDEVMTAB_COUNT_FILESYSTEMS: %s\n", strerror (errno));
272 fslist = (struct k_fstype *) calloc ( numfilesystems, sizeof(struct k_fstype));
274 /* Grab the list of available filesystems */
275 status = ioctl (fd, DEVMTAB_GET_FILESYSTEMS, fslist);
277 fatalError("\nDEVMTAB_GET_FILESYSTEMS: %s\n", strerror (errno));
279 /* Walk the list trying to mount filesystems
280 * that do not claim to be nodev filesystems */
281 for( i = 0 ; i < numfilesystems ; i++) {
282 if (fslist[i].mnt_nodev)
284 status = do_mount(blockDevice, directory, fslist[i].mnt_type,
285 flags | MS_MGC_VAL, string_flags,
286 useMtab, fakeIt, mtab_opts);
295 status = do_mount(blockDevice, directory, filesystemType,
296 flags | MS_MGC_VAL, string_flags, useMtab,
300 if (status == FALSE && whineOnErrors == TRUE) {
301 if (whineOnErrors == TRUE) {
302 fprintf(stderr, "Mounting %s on %s failed: %s\n",
303 blockDevice, directory, strerror(errno));
310 extern int mount_main(int argc, char **argv)
312 char string_flags_buf[1024] = "";
313 char *string_flags = string_flags_buf;
314 char *extra_opts = string_flags_buf;
315 unsigned long flags = 0;
316 char *filesystemType = "auto";
318 char *directory = NULL;
324 #if defined BB_FEATURE_USE_DEVPS_PATCH
326 int fd, i, numfilesystems;
327 char device[] = "/dev/mtab";
328 struct k_mntent *mntentlist;
331 fd = open(device, O_RDONLY);
333 fatalError("open failed for `%s': %s\n", device, strerror (errno));
335 /* How many mounted filesystems? We need to know to
336 * allocate enough space for later... */
337 numfilesystems = ioctl (fd, DEVMTAB_COUNT_MOUNTS);
338 if (numfilesystems<0)
339 fatalError( "\nDEVMTAB_COUNT_MOUNTS: %s\n", strerror (errno));
340 mntentlist = (struct k_mntent *) calloc ( numfilesystems, sizeof(struct k_mntent));
342 /* Grab the list of mounted filesystems */
343 if (ioctl (fd, DEVMTAB_GET_MOUNTS, mntentlist)<0)
344 fatalError( "\nDEVMTAB_GET_MOUNTS: %s\n", strerror (errno));
346 for( i = 0 ; i < numfilesystems ; i++) {
347 fprintf( stdout, "%s %s %s %s %d %d\n", mntentlist[i].mnt_fsname,
348 mntentlist[i].mnt_dir, mntentlist[i].mnt_type,
349 mntentlist[i].mnt_opts, mntentlist[i].mnt_freq,
350 mntentlist[i].mnt_passno);
352 /* Don't bother to close files or free memory. Exit
353 * does that automagically, so we can save a few bytes */
362 FILE *mountTable = setmntent(mtab_file, "r");
367 while ((m = getmntent(mountTable)) != 0) {
368 char *blockDevice = m->mnt_fsname;
369 if (strcmp(blockDevice, "/dev/root") == 0) {
370 find_real_root_device_name( blockDevice);
372 printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
373 m->mnt_type, m->mnt_opts);
375 endmntent(mountTable);
386 while (i > 0 && **argv) {
390 while (i > 0 && *++opt)
396 parse_mount_options(*(++argv), &flags, string_flags);
405 filesystemType = *(++argv);
422 break; /* ignore -v */
430 else if (directory == NULL)
442 FILE *f = setmntent("/etc/fstab", "r");
445 fatalError( "\nCannot read /etc/fstab: %s\n", strerror (errno));
447 while ((m = getmntent(f)) != NULL) {
448 // If the file system isn't noauto,
449 // and isn't swap or nfs, then mount it
450 if ((!strstr(m->mnt_opts, "noauto")) &&
451 (!strstr(m->mnt_type, "swap")) &&
452 (!strstr(m->mnt_type, "nfs"))) {
454 *string_flags = '\0';
455 parse_mount_options(m->mnt_opts, &flags, string_flags);
456 /* If the directory is /, try to remount
457 * with the options specified in fstab */
458 if (m->mnt_dir[0] == '/' && m->mnt_dir[1] == '\0') {
461 if (mount_one(m->mnt_fsname, m->mnt_dir, m->mnt_type,
462 flags, string_flags, useMtab, fakeIt,
465 /* Try again, but this time try a remount */
466 mount_one(m->mnt_fsname, m->mnt_dir, m->mnt_type,
467 flags|MS_REMOUNT, string_flags, useMtab, fakeIt,
474 if (device && directory) {
476 if (strcmp(filesystemType, "nfs") == 0) {
478 (device, directory, &flags, &extra_opts, &string_flags,
483 exit(mount_one(device, directory, filesystemType,
484 flags, string_flags, useMtab, fakeIt,