mount.c - fp2-dev/platform/external/busybox - Gitiles

 /* 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[] =
 	"mount [flags] device directory [-o options,more-options]\n"
 #ifndef BB_FEATURE_TRIVIAL_HELP
 	"\nMount a filesystem\n\n"
 	"Flags:\n"
 	"\t-a:\t\tMount all filesystems in fstab.\n"
 #ifdef BB_MTAB
 	"\t-f:\t\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
 	"\t-n:\t\tDon't write a mount table entry.\n"
 #endif
 	"\t-o option:\tOne of many filesystem options, listed below.\n"
 	"\t-r:\t\tMount the filesystem read-only.\n"
 	"\t-t fs-type:\tSpecify the filesystem type.\n"
 	"\t-w:\t\tMount for reading and writing (default).\n"
 	"\n"
 	"Options for use with the \"-o\" flag:\n"
 	"\tasync/sync:\tWrites are asynchronous / synchronous.\n"
 	"\tatime/noatime:\tEnable / disable updates to inode access times.\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:\t\tMounts a file via loop device.\n"
 #endif
 	"\tsuid/nosuid:\tAllow set-user-id-root programs / disallow them.\n"
 	"\tremount:\tRe-mount a currently-mounted filesystem, changing its flags.\n"
 	"\tro/rw:\t\tMount for read-only / read-write.\n"
 	"\nThere are EVEN MORE flags that are specific to each filesystem.\n"
 	"You'll have to see the written documentation for those.\n"
 #endif
 	;


 struct mount_options {
 	const char *name;
 	unsigned long and;
 	unsigned long or;
 };

 static const struct mount_options mount_options[] = {
 	{"async", ~MS_SYNCHRONOUS, 0},
 	{"atime", ~0, ~MS_NOATIME},
 	{"defaults", ~0, 0},
 	{"dev", ~MS_NODEV, 0},
 	{"diratime", ~0, ~MS_NODIRATIME},
 	{"exec", ~MS_NOEXEC, 0},
 	{"noatime", ~0, MS_NOATIME},
 	{"nodev", ~0, MS_NODEV},
 	{"nodiratime", ~0, MS_NODIRATIME},
 	{"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 filesystem 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);
 }
	/* 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[] =
	"mount [flags] device directory [-o options,more-options]\n"
	#ifndef BB_FEATURE_TRIVIAL_HELP
	"\nMount a filesystem\n\n"
	"Flags:\n"
	"\t-a:\t\tMount all filesystems in fstab.\n"
	#ifdef BB_MTAB
	"\t-f:\t\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
	"\t-n:\t\tDon't write a mount table entry.\n"
	#endif
	"\t-o option:\tOne of many filesystem options, listed below.\n"
	"\t-r:\t\tMount the filesystem read-only.\n"
	"\t-t fs-type:\tSpecify the filesystem type.\n"
	"\t-w:\t\tMount for reading and writing (default).\n"
	"\n"
	"Options for use with the \"-o\" flag:\n"
	"\tasync/sync:\tWrites are asynchronous / synchronous.\n"
	"\tatime/noatime:\tEnable / disable updates to inode access times.\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:\t\tMounts a file via loop device.\n"
	#endif
	"\tsuid/nosuid:\tAllow set-user-id-root programs / disallow them.\n"
	"\tremount:\tRe-mount a currently-mounted filesystem, changing its flags.\n"
	"\tro/rw:\t\tMount for read-only / read-write.\n"
	"\nThere are EVEN MORE flags that are specific to each filesystem.\n"
	"You'll have to see the written documentation for those.\n"
	#endif
	;


	struct mount_options {
	const char *name;
	unsigned long and;
	unsigned long or;
	};

	static const struct mount_options mount_options[] = {
	{"async", ~MS_SYNCHRONOUS, 0},
	{"atime", ~0, ~MS_NOATIME},
	{"defaults", ~0, 0},
	{"dev", ~MS_NODEV, 0},
	{"diratime", ~0, ~MS_NODIRATIME},
	{"exec", ~MS_NOEXEC, 0},
	{"noatime", ~0, MS_NOATIME},
	{"nodev", ~0, MS_NODEV},
	{"nodiratime", ~0, MS_NODIRATIME},
	{"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 filesystem 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);
	}