495 lines
13 KiB
C
495 lines
13 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Mini mount implementation for busybox
|
|
*
|
|
* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
* 3/21/1999 Charles P. Wright <cpwright@cpwright.com>
|
|
* searches through fstab when -a is passed
|
|
* will try mounting stuff with all fses when passed -t auto
|
|
*
|
|
* 1999-04-17 Dave Cinege...Rewrote -t auto. Fixed ro mtab.
|
|
*
|
|
* 1999-10-07 Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
|
|
* Rewrite of a lot of code. Removed mtab usage (I plan on
|
|
* putting it back as a compile-time option some time),
|
|
* major adjustments to option parsing, and some serious
|
|
* dieting all around.
|
|
*
|
|
* 1999-11-06 mtab suppport is back - andersee
|
|
*
|
|
* 2000-01-12 Ben Collins <bcollins@debian.org>, Borrowed utils-linux's
|
|
* mount to add loop support.
|
|
*/
|
|
|
|
#include "internal.h"
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
#include <mntent.h>
|
|
#include <sys/mount.h>
|
|
#include <ctype.h>
|
|
#if defined BB_FEATURE_USE_DEVPS_PATCH
|
|
#include <linux/devmtab.h>
|
|
#endif
|
|
#ifndef MS_RDONLY
|
|
#include <linux/fs.h>
|
|
#endif
|
|
|
|
|
|
#if defined BB_FEATURE_MOUNT_LOOP
|
|
#include <fcntl.h>
|
|
#include <sys/ioctl.h>
|
|
#include <linux/loop.h>
|
|
|
|
|
|
static int use_loop = FALSE;
|
|
#endif
|
|
|
|
extern const char mtab_file[]; /* Defined in utility.c */
|
|
|
|
static const char mount_usage[] = "\tmount [flags]\n"
|
|
"\tmount [flags] device directory [-o options,more-options]\n"
|
|
"\n" "Flags:\n" "\t-a:\tMount all file systems in fstab.\n"
|
|
#ifdef BB_MTAB
|
|
"\t-f:\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
|
|
"\t-n:\tDon't write a mount table entry.\n"
|
|
#endif
|
|
"\t-o option:\tOne of many filesystem options, listed below.\n"
|
|
"\t-r:\tMount the filesystem read-only.\n"
|
|
"\t-t filesystem-type:\tSpecify the filesystem type.\n"
|
|
"\t-w:\tMount for reading and writing (default).\n"
|
|
"\n"
|
|
"Options for use with the \"-o\" flag:\n"
|
|
"\tasync / sync:\tWrites are asynchronous / synchronous.\n"
|
|
"\tdev / nodev:\tAllow use of special device files / disallow them.\n"
|
|
"\texec / noexec:\tAllow use of executable files / disallow them.\n"
|
|
#if defined BB_FEATURE_MOUNT_LOOP
|
|
"\tloop: Mounts a file via loop device.\n"
|
|
#endif
|
|
"\tsuid / nosuid:\tAllow set-user-id-root programs / disallow them.\n"
|
|
"\tremount: Re-mount a currently-mounted filesystem, changing its flags.\n"
|
|
"\tro / rw: Mount for read-only / read-write.\n"
|
|
"There are EVEN MORE flags that are specific to each filesystem.\n"
|
|
"You'll have to see the written documentation for those.\n";
|
|
|
|
|
|
struct mount_options {
|
|
const char *name;
|
|
unsigned long and;
|
|
unsigned long or;
|
|
};
|
|
|
|
static const struct mount_options mount_options[] = {
|
|
{"async", ~MS_SYNCHRONOUS, 0},
|
|
{"defaults", ~0, 0},
|
|
{"dev", ~MS_NODEV, 0},
|
|
{"exec", ~MS_NOEXEC, 0},
|
|
{"nodev", ~0, MS_NODEV},
|
|
{"noexec", ~0, MS_NOEXEC},
|
|
{"nosuid", ~0, MS_NOSUID},
|
|
{"remount", ~0, MS_REMOUNT},
|
|
{"ro", ~0, MS_RDONLY},
|
|
{"rw", ~MS_RDONLY, 0},
|
|
{"suid", ~MS_NOSUID, 0},
|
|
{"sync", ~0, MS_SYNCHRONOUS},
|
|
{0, 0, 0}
|
|
};
|
|
|
|
static int
|
|
do_mount(char *specialfile, char *dir, char *filesystemtype,
|
|
long flags, void *string_flags, int useMtab, int fakeIt,
|
|
char *mtab_opts)
|
|
{
|
|
int status = 0;
|
|
char *lofile = NULL;
|
|
|
|
#if defined BB_MTAB
|
|
if (fakeIt == FALSE)
|
|
#endif
|
|
{
|
|
#if defined BB_FEATURE_MOUNT_LOOP
|
|
if (use_loop==TRUE) {
|
|
int loro = flags & MS_RDONLY;
|
|
char *lofile = specialfile;
|
|
|
|
specialfile = find_unused_loop_device();
|
|
if (specialfile == NULL) {
|
|
fprintf(stderr, "Could not find a spare loop device\n");
|
|
return (FALSE);
|
|
}
|
|
if (set_loop(specialfile, lofile, 0, &loro)) {
|
|
fprintf(stderr, "Could not setup loop device\n");
|
|
return (FALSE);
|
|
}
|
|
if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
|
|
fprintf(stderr, "WARNING: loop device is read-only\n");
|
|
flags &= ~MS_RDONLY;
|
|
}
|
|
}
|
|
#endif
|
|
status =
|
|
mount(specialfile, dir, filesystemtype, flags, string_flags);
|
|
}
|
|
|
|
|
|
/* If the mount was sucessful, do anything needed, then return TRUE */
|
|
if (status == 0) {
|
|
|
|
#if defined BB_MTAB
|
|
if (useMtab == TRUE) {
|
|
write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
|
|
}
|
|
#endif
|
|
return (TRUE);
|
|
}
|
|
|
|
/* Bummer. mount failed. Clean up */
|
|
#if defined BB_FEATURE_MOUNT_LOOP
|
|
if (lofile != NULL) {
|
|
del_loop(specialfile);
|
|
}
|
|
#endif
|
|
return (FALSE);
|
|
}
|
|
|
|
|
|
|
|
/* Seperate standard mount options from the nonstandard string options */
|
|
static void
|
|
parse_mount_options(char *options, unsigned long *flags, char *strflags)
|
|
{
|
|
while (options) {
|
|
int gotone = FALSE;
|
|
char *comma = strchr(options, ',');
|
|
const struct mount_options *f = mount_options;
|
|
|
|
if (comma)
|
|
*comma = '\0';
|
|
|
|
while (f->name != 0) {
|
|
if (strcasecmp(f->name, options) == 0) {
|
|
|
|
*flags &= f->and;
|
|
*flags |= f->or;
|
|
gotone = TRUE;
|
|
break;
|
|
}
|
|
f++;
|
|
}
|
|
#if defined BB_FEATURE_MOUNT_LOOP
|
|
if (gotone == FALSE && !strcasecmp("loop", options)) { /* loop device support */
|
|
use_loop = TRUE;
|
|
gotone = TRUE;
|
|
}
|
|
#endif
|
|
if (*strflags && strflags != '\0' && gotone == FALSE) {
|
|
char *temp = strflags;
|
|
|
|
temp += strlen(strflags);
|
|
*temp++ = ',';
|
|
*temp++ = '\0';
|
|
}
|
|
if (gotone == FALSE)
|
|
strcat(strflags, options);
|
|
if (comma) {
|
|
*comma = ',';
|
|
options = ++comma;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
int
|
|
mount_one(char *blockDevice, char *directory, char *filesystemType,
|
|
unsigned long flags, char *string_flags, int useMtab, int fakeIt,
|
|
char *mtab_opts, int whineOnErrors)
|
|
{
|
|
int status = 0;
|
|
|
|
#if defined BB_FEATURE_USE_PROCFS
|
|
char buf[255];
|
|
if (strcmp(filesystemType, "auto") == 0) {
|
|
FILE *f = fopen("/proc/filesystems", "r");
|
|
|
|
if (f == NULL)
|
|
return (FALSE);
|
|
|
|
while (fgets(buf, sizeof(buf), f) != NULL) {
|
|
filesystemType = buf;
|
|
if (*filesystemType == '\t') { // Not a nodev filesystem
|
|
|
|
// Add NULL termination to each line
|
|
while (*filesystemType && *filesystemType != '\n')
|
|
filesystemType++;
|
|
*filesystemType = '\0';
|
|
|
|
filesystemType = buf;
|
|
filesystemType++; // hop past tab
|
|
|
|
status = do_mount(blockDevice, directory, filesystemType,
|
|
flags | MS_MGC_VAL, string_flags,
|
|
useMtab, fakeIt, mtab_opts);
|
|
if (status == TRUE)
|
|
break;
|
|
}
|
|
}
|
|
fclose(f);
|
|
} else
|
|
#endif
|
|
#if defined BB_FEATURE_USE_DEVPS_PATCH
|
|
if (strcmp(filesystemType, "auto") == 0) {
|
|
int fd, i, numfilesystems;
|
|
char device[] = "/dev/mtab";
|
|
struct k_fstype *fslist;
|
|
|
|
/* open device */
|
|
fd = open(device, O_RDONLY);
|
|
if (fd < 0)
|
|
fatalError("open failed for `%s': %s\n", device, strerror (errno));
|
|
|
|
/* How many filesystems? We need to know to allocate enough space */
|
|
numfilesystems = ioctl (fd, DEVMTAB_COUNT_FILESYSTEMS);
|
|
if (numfilesystems<0)
|
|
fatalError("\nDEVMTAB_COUNT_FILESYSTEMS: %s\n", strerror (errno));
|
|
fslist = (struct k_fstype *) calloc ( numfilesystems, sizeof(struct k_fstype));
|
|
|
|
/* Grab the list of available filesystems */
|
|
status = ioctl (fd, DEVMTAB_GET_FILESYSTEMS, fslist);
|
|
if (status<0)
|
|
fatalError("\nDEVMTAB_GET_FILESYSTEMS: %s\n", strerror (errno));
|
|
|
|
/* Walk the list trying to mount filesystems
|
|
* that do not claim to be nodev filesystems */
|
|
for( i = 0 ; i < numfilesystems ; i++) {
|
|
if (fslist[i].mnt_nodev)
|
|
continue;
|
|
status = do_mount(blockDevice, directory, fslist[i].mnt_type,
|
|
flags | MS_MGC_VAL, string_flags,
|
|
useMtab, fakeIt, mtab_opts);
|
|
if (status == TRUE)
|
|
break;
|
|
}
|
|
free( fslist);
|
|
close(fd);
|
|
} else
|
|
#endif
|
|
{
|
|
status = do_mount(blockDevice, directory, filesystemType,
|
|
flags | MS_MGC_VAL, string_flags, useMtab,
|
|
fakeIt, mtab_opts);
|
|
}
|
|
|
|
if (status == FALSE && whineOnErrors == TRUE) {
|
|
if (whineOnErrors == TRUE) {
|
|
fprintf(stderr, "Mounting %s on %s failed: %s\n",
|
|
blockDevice, directory, strerror(errno));
|
|
}
|
|
return (FALSE);
|
|
}
|
|
return (TRUE);
|
|
}
|
|
|
|
extern int mount_main(int argc, char **argv)
|
|
{
|
|
char string_flags_buf[1024] = "";
|
|
char *string_flags = string_flags_buf;
|
|
char *extra_opts = string_flags_buf;
|
|
unsigned long flags = 0;
|
|
char *filesystemType = "auto";
|
|
char *device = NULL;
|
|
char *directory = NULL;
|
|
int all = FALSE;
|
|
int fakeIt = FALSE;
|
|
int useMtab = TRUE;
|
|
int i;
|
|
|
|
#if defined BB_FEATURE_USE_DEVPS_PATCH
|
|
if (argc == 1) {
|
|
int fd, i, numfilesystems;
|
|
char device[] = "/dev/mtab";
|
|
struct k_mntent *mntentlist;
|
|
|
|
/* open device */
|
|
fd = open(device, O_RDONLY);
|
|
if (fd < 0)
|
|
fatalError("open failed for `%s': %s\n", device, strerror (errno));
|
|
|
|
/* How many mounted filesystems? We need to know to
|
|
* allocate enough space for later... */
|
|
numfilesystems = ioctl (fd, DEVMTAB_COUNT_MOUNTS);
|
|
if (numfilesystems<0)
|
|
fatalError( "\nDEVMTAB_COUNT_MOUNTS: %s\n", strerror (errno));
|
|
mntentlist = (struct k_mntent *) calloc ( numfilesystems, sizeof(struct k_mntent));
|
|
|
|
/* Grab the list of mounted filesystems */
|
|
if (ioctl (fd, DEVMTAB_GET_MOUNTS, mntentlist)<0)
|
|
fatalError( "\nDEVMTAB_GET_MOUNTS: %s\n", strerror (errno));
|
|
|
|
for( i = 0 ; i < numfilesystems ; i++) {
|
|
fprintf( stdout, "%s %s %s %s %d %d\n", mntentlist[i].mnt_fsname,
|
|
mntentlist[i].mnt_dir, mntentlist[i].mnt_type,
|
|
mntentlist[i].mnt_opts, mntentlist[i].mnt_freq,
|
|
mntentlist[i].mnt_passno);
|
|
}
|
|
/* Don't bother to close files or free memory. Exit
|
|
* does that automagically, so we can save a few bytes */
|
|
#if 0
|
|
free( mntentlist);
|
|
close(fd);
|
|
#endif
|
|
exit(TRUE);
|
|
}
|
|
#else
|
|
if (argc == 1) {
|
|
FILE *mountTable = setmntent(mtab_file, "r");
|
|
|
|
if (mountTable) {
|
|
struct mntent *m;
|
|
|
|
while ((m = getmntent(mountTable)) != 0) {
|
|
char *blockDevice = m->mnt_fsname;
|
|
if (strcmp(blockDevice, "/dev/root") == 0) {
|
|
find_real_root_device_name( blockDevice);
|
|
}
|
|
printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
|
|
m->mnt_type, m->mnt_opts);
|
|
}
|
|
endmntent(mountTable);
|
|
} else {
|
|
perror(mtab_file);
|
|
}
|
|
exit(TRUE);
|
|
}
|
|
#endif
|
|
|
|
/* Parse options */
|
|
i = --argc;
|
|
argv++;
|
|
while (i > 0 && **argv) {
|
|
if (**argv == '-') {
|
|
char *opt = *argv;
|
|
|
|
while (i > 0 && *++opt)
|
|
switch (*opt) {
|
|
case 'o':
|
|
if (--i == 0) {
|
|
goto goodbye;
|
|
}
|
|
parse_mount_options(*(++argv), &flags, string_flags);
|
|
break;
|
|
case 'r':
|
|
flags |= MS_RDONLY;
|
|
break;
|
|
case 't':
|
|
if (--i == 0) {
|
|
goto goodbye;
|
|
}
|
|
filesystemType = *(++argv);
|
|
break;
|
|
case 'w':
|
|
flags &= ~MS_RDONLY;
|
|
break;
|
|
case 'a':
|
|
all = TRUE;
|
|
break;
|
|
case 'f':
|
|
fakeIt = TRUE;
|
|
break;
|
|
#ifdef BB_MTAB
|
|
case 'n':
|
|
useMtab = FALSE;
|
|
break;
|
|
#endif
|
|
case 'v':
|
|
break; /* ignore -v */
|
|
case 'h':
|
|
case '-':
|
|
goto goodbye;
|
|
}
|
|
} else {
|
|
if (device == NULL)
|
|
device = *argv;
|
|
else if (directory == NULL)
|
|
directory = *argv;
|
|
else {
|
|
goto goodbye;
|
|
}
|
|
}
|
|
i--;
|
|
argv++;
|
|
}
|
|
|
|
if (all == TRUE) {
|
|
struct mntent *m;
|
|
FILE *f = setmntent("/etc/fstab", "r");
|
|
|
|
if (f == NULL)
|
|
fatalError( "\nCannot read /etc/fstab: %s\n", strerror (errno));
|
|
|
|
while ((m = getmntent(f)) != NULL) {
|
|
// If the file system isn't noauto,
|
|
// and isn't swap or nfs, then mount it
|
|
if ((!strstr(m->mnt_opts, "noauto")) &&
|
|
(!strstr(m->mnt_type, "swap")) &&
|
|
(!strstr(m->mnt_type, "nfs"))) {
|
|
flags = 0;
|
|
*string_flags = '\0';
|
|
parse_mount_options(m->mnt_opts, &flags, string_flags);
|
|
/* If the directory is /, try to remount
|
|
* with the options specified in fstab */
|
|
if (m->mnt_dir[0] == '/' && m->mnt_dir[1] == '\0') {
|
|
flags |= MS_REMOUNT;
|
|
}
|
|
if (mount_one(m->mnt_fsname, m->mnt_dir, m->mnt_type,
|
|
flags, string_flags, useMtab, fakeIt,
|
|
extra_opts, FALSE))
|
|
{
|
|
/* Try again, but this time try a remount */
|
|
mount_one(m->mnt_fsname, m->mnt_dir, m->mnt_type,
|
|
flags|MS_REMOUNT, string_flags, useMtab, fakeIt,
|
|
extra_opts, TRUE);
|
|
}
|
|
}
|
|
}
|
|
endmntent(f);
|
|
} else {
|
|
if (device && directory) {
|
|
#ifdef BB_NFSMOUNT
|
|
if (strcmp(filesystemType, "nfs") == 0) {
|
|
if (nfsmount
|
|
(device, directory, &flags, &extra_opts, &string_flags,
|
|
1) != 0)
|
|
exit(FALSE);
|
|
}
|
|
#endif
|
|
exit(mount_one(device, directory, filesystemType,
|
|
flags, string_flags, useMtab, fakeIt,
|
|
extra_opts, TRUE));
|
|
} else {
|
|
goto goodbye;
|
|
}
|
|
}
|
|
exit(TRUE);
|
|
|
|
goodbye:
|
|
usage(mount_usage);
|
|
}
|