util-linux/mount.c - codeaurora/busybox - Gitiles

 /* vi: set sw=4 ts=4: */
 /*
  * Mini mount implementation for busybox
  *
  * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
  * Copyright (C) 2005 by Rob Landley <rob@landley.net>
  *
  * 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
  *
  */

 #include <limits.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <errno.h>
 #include <string.h>
 #include <stdio.h>
 #include <mntent.h>
 #include <ctype.h>
 #include <sys/mount.h>
 #include <fcntl.h>		// for CONFIG_FEATURE_MOUNT_LOOP
 #include <sys/ioctl.h>  // for CONFIG_FEATURE_MOUNT_LOOP
 #include "busybox.h"

 /* This is just a warning of a common mistake.  Possibly this should be a
  * uclibc faq entry rather than in busybox... */
 #if ENABLE_FEATURE_MOUNT_NFS && defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
 #error "You need to build uClibc with UCLIBC_HAS_RPC for busybox mount with NFS support to compile."
 #endif

 // These two aren't always defined in old headers
 #ifndef MS_BIND
 #define MS_BIND		4096
 #endif
 #ifndef MS_MOVE
 #define MS_MOVE		8192
 #endif

 /* Consume standard mount options (from -o options or --options).
  * Set appropriate flags and collect unrecognized ones as a comma separated
  * string to pass to kernel */

 struct {
 	const char *name;
 	long flags;
 } static const  mount_options[] = {
 	{"loop", 0},
 	{"defaults", 0},
 	{"noauto", 0},
 	{"ro", MS_RDONLY},
 	{"rw", ~MS_RDONLY},
 	{"nosuid", MS_NOSUID},
 	{"suid", ~MS_NOSUID},
 	{"dev", ~MS_NODEV},
 	{"nodev", MS_NODEV},
 	{"exec", ~MS_NOEXEC},
 	{"noexec", MS_NOEXEC},
 	{"sync", MS_SYNCHRONOUS},
 	{"async", ~MS_SYNCHRONOUS},
 	{"remount", MS_REMOUNT},
 	{"atime", MS_NOATIME},
 	{"noatime", MS_NOATIME},
 	{"diratime", MS_NODIRATIME},
 	{"nodiratime", MS_NODIRATIME},
 	{"bind", MS_BIND},
 	{"move", MS_MOVE}
 };

 /* Uses the mount_options list above */
 static void parse_mount_options(char *options, int *flags, char **strflags)
 {
 	// Loop through options
 	for(;;) {
 		int i;
 		char *comma = strchr(options, ',');

 		if(comma) *comma = 0;

 		// Find this option in mount_options
 		for(i = 0; i < (sizeof(mount_options) / sizeof(*mount_options)); i++) {
 			if(!strcasecmp(mount_options[i].name, options)) {
 				long fl = mount_options[i].flags;
 				if(fl < 0) *flags &= fl;
 				else *flags |= fl;
 				break;
 			}
 		}
 		// Unrecognized mount option?
 		if(i == (sizeof(mount_options) / sizeof(*mount_options))) {
 			// Add it to strflags, to pass on to kernel
 			i = *strflags ? strlen(*strflags) : 0;
 			*strflags = xrealloc(*strflags, i+strlen(options)+2);
 			// Comma separated if it's not the first one
 			if(i) (*strflags)[i++] = ',';
 			strcpy((*strflags)+i, options);
 		}
 		// Advance to next option, or finish
 		if(comma) {
 			*comma = ',';
 			options = ++comma;
 		} else break;
 	}
 }

 /* This does the work */

 extern int mount_main(int argc, char **argv)
 {
 	char *string_flags = 0, *fsType = 0, *blockDevice = 0, *directory = 0,
 		 *loopFile = 0, *buf = 0,
 		 *files[] = {"/etc/filesystems", "/proc/filesystems", 0};
 	int i, opt, all = FALSE, fakeIt = FALSE, allowWrite = FALSE,
 	   	rc = 1, useMtab = ENABLE_FEATURE_MTAB_SUPPORT;
 	int flags=0xc0ed0000;	// Needed for linux 2.2, ignored by 2.4 and 2.6.
 	FILE *file = 0,*f = 0;
 	char path[PATH_MAX*2];
 	struct mntent m;
 	struct stat statbuf;

 	/* parse long options, like --bind and --move.  Note that -o option
 	 * and --option are synonymous.  Yes, this means --remount,rw works. */

 	for(i = opt = 0; i < argc; i++) {
 		if(argv[i][0] == '-' && argv[i][1] == '-')
 			parse_mount_options(argv[i]+2, &flags, &string_flags);
 		else argv[opt++] = argv[i];
 	}
 	argc = opt;

 	// Parse remaining options

 	while((opt = getopt(argc, argv, "o:t:rwafnv")) > 0) {
 		switch (opt) {
 		case 'o':
 			parse_mount_options(optarg, &flags, &string_flags);
 			break;
 		case 't':
 			fsType = optarg;
 			break;
 		case 'r':
 			flags |= MS_RDONLY;
 			break;
 		case 'w':
 			allowWrite=TRUE;
 			break;
 		case 'a':
 			all = TRUE;
 			break;
 		case 'f':
 			fakeIt = TRUE;
 			break;
 		case 'n':
 			useMtab = FALSE;
 			break;
 		case 'v':
 			break;		// ignore -v
 		default:
 			bb_show_usage();
 		}
 	}

 	// If we have no arguments, show currently mounted filesystems

 	if(!all && (optind == argc)) {
 		FILE *mountTable = setmntent(bb_path_mtab_file, "r");

 		if(!mountTable) bb_perror_msg_and_die(bb_path_mtab_file);

 		while (getmntent_r(mountTable,&m,path,sizeof(path))) {
 			blockDevice = m.mnt_fsname;

 			// Clean up display a little bit regarding root devie
 			if(!strcmp(blockDevice, "rootfs")) continue;
 			if(!strcmp(blockDevice, "/dev/root"))
 				blockDevice = find_block_device("/");

 			if(!fsType || !strcmp(m.mnt_type, fsType))
 				printf("%s on %s type %s (%s)\n", blockDevice, m.mnt_dir,
 					   m.mnt_type, m.mnt_opts);
 			if(ENABLE_FEATURE_CLEAN_UP && blockDevice != m.mnt_fsname)
 				free(blockDevice);
 		}
 		endmntent(mountTable);
 		return EXIT_SUCCESS;
 	}

 	/* The next argument is what to mount.  if there's an argument after that
 	 * it's where to mount it.  If we're not mounting all, and we have both
 	 * of these arguments, jump straight to the actual mount. */

 	statbuf.st_mode=0;
 	if(optind < argc)
 		blockDevice = !stat(argv[optind], &statbuf) ?
 		  	 	bb_simplify_path(argv[optind]) :
 				(ENABLE_FEATURE_CLEAN_UP ? strdup(argv[optind]) : argv[optind]);
 	if(optind+1 < argc) directory = bb_simplify_path(argv[optind+1]);

     // If we don't have to loop through fstab, skip ahead a bit.

 	if(!all && optind+1!=argc) goto singlemount;

 	// Loop through /etc/fstab entries to look up this entry.

 	if(!(file=setmntent("/etc/fstab","r")))
 		bb_perror_msg_and_die("\nCannot read /etc/fstab");
 	for(;;) {

 		// Get next fstab entry

 		if(!getmntent_r(file,&m,path,sizeof(path))) {
 			if(!all)
 				bb_perror_msg("Can't find %s in /etc/fstab\n", blockDevice);
 			break;
 		}

 		// If we're mounting all and all doesn't mount this one, skip it.

 		if(all) {
 			if(strstr(m.mnt_opts,"noauto") || strstr(m.mnt_type,"swap"))
 				continue;
 			flags=0;

 		/* If we're mounting something specific and this isn't it, skip it.
 		 * Note we must match both the exact text in fstab (ala "proc") or
 		 * a full path from root */

 		} else if(strcmp(blockDevice,m.mnt_fsname) &&
 				  strcmp(argv[optind],m.mnt_fsname) &&
 				  strcmp(blockDevice,m.mnt_dir) &&
 				  strcmp(argv[optind],m.mnt_dir)) continue;

 		/* Parse flags from /etc/fstab (unless this is a single mount
 		 * overriding fstab -- note the "all" test above zeroed the flags,
 		 * to prevent flags from previous entries affecting this one, so
 		 * the only way we could get here with nonzero flags is a single
 		 * mount). */

 		if(!flags) {
 			if(ENABLE_FEATURE_CLEAN_UP) free(string_flags);
 			string_flags=NULL;
 			parse_mount_options(m.mnt_opts, &flags, &string_flags);
 		}

 		/* Fill out remaining fields with info from mtab */

 		if(ENABLE_FEATURE_CLEAN_UP) {
 			free(blockDevice);
 			blockDevice=strdup(m.mnt_fsname);
 			free(directory);
 			directory=strdup(m.mnt_type);
 		} else {
 			blockDevice=m.mnt_fsname;
 			directory=m.mnt_dir;
 		}
 		fsType=m.mnt_type;

 		/* Ok, we're ready to actually mount a specific source on a specific
 		 * directory now. */

 singlemount:

 		// If they said -w, override fstab

 		if(allowWrite) flags&=~MS_RDONLY;

 		// Might this be an NFS filesystem?

 		if(ENABLE_FEATURE_MOUNT_NFS && (!fsType || !strcmp(fsType,"nfs")) &&
 			strchr(blockDevice, ':') != NULL)
 		{
 			if(nfsmount(blockDevice, directory, &flags, &string_flags, 1))
 				bb_perror_msg("nfsmount failed");
 			else {
 				rc = 0;
 				fsType="nfs";
 				// Strangely enough, nfsmount() doesn't actually mount()
 				goto mount_it_now;
 			}
 		} else {

 			// Do we need to allocate a loopback device?

 			if(ENABLE_FEATURE_MOUNT_LOOP && !fakeIt && S_ISREG(statbuf.st_mode))
 			{
 				loopFile = blockDevice;
 				blockDevice = 0;
 				switch(set_loop(&blockDevice, loopFile, 0)) {
 					case 0:
 					case 1:
 						break;
 					default:
 						bb_error_msg_and_die(
 							errno == EPERM || errno == EACCES ?
 							bb_msg_perm_denied_are_you_root :
 							"Couldn't setup loop device");
 						break;
 				}
 			}

 			/* If we know the fstype (or don't need to), jump straight
 			 * to the actual mount. */

 			if(fsType || (flags & (MS_REMOUNT | MS_BIND | MS_MOVE)))
 				goto mount_it_now;
 		}

 		// Loop through filesystem types until mount succeeds or we run out

 		for(i = 0; files[i] && rc; i++) {
 			f = fopen(files[i], "r");
 			if(!f) continue;
 			// Get next block device backed filesystem
 			for(buf = 0; (buf = fsType = bb_get_chomped_line_from_file(f));
 				   	free(buf))
 			{
 				// Skip funky entries in /proc
 				if(!strncmp(buf,"nodev",5) && isspace(buf[5])) continue;

 				while(isspace(*fsType)) fsType++;
 				if(*buf=='#' || *buf=='*') continue;
 				if(!*fsType) continue;
 mount_it_now:
 				// Okay, try to mount

 				if (!fakeIt) {
 					for(;;) {
 						rc = mount(blockDevice, directory, fsType, flags, string_flags);
 						if(!rc || (flags&MS_RDONLY) || (errno!=EACCES && errno!=EROFS))
 							break;
 						bb_error_msg("%s is write-protected, mounting read-only", blockDevice);
 						flags|=MS_RDONLY;
 					}
 				}
 				if(!rc || !f) break;
 			}
 			if(f) fclose(f);
 			if(!f || !rc) break;
 		}

 		/* If the mount was sucessful, and we're maintaining an old-style
 		 * mtab file by hand, add new entry to it now. */
 		if((!rc || fakeIt) && useMtab) {
 			FILE *mountTable = setmntent(bb_path_mtab_file, "a+");

 			if(!mountTable) bb_perror_msg(bb_path_mtab_file);
 			else {
 				// Remove trailing / (if any) from directory we mounted on
 				int length=strlen(directory);
 				if(length>1 && directory[length-1] == '/')
 					directory[length-1]=0;

 				// Fill out structure (should be ok to re-use existing one).
 				m.mnt_fsname=blockDevice;
 				m.mnt_dir=directory;
 				m.mnt_type=fsType ? : "--bind";
 				m.mnt_opts=string_flags ? :
 					((flags & MS_RDONLY) ? "ro" : "rw");
 				m.mnt_freq = 0;
 				m.mnt_passno = 0;

 				// Write and close
 				addmntent(mountTable, &m);
 				endmntent(mountTable);
 			}
 		} else {
 			// Mount failed.  Clean up
 			if(loopFile) {
 				del_loop(blockDevice);
 				if(ENABLE_FEATURE_CLEAN_UP) free(loopFile);
 			}
 			// Don't whine about already mounted fs when mounting all.
 			if(rc<0 && errno == EBUSY && all) rc = 0;
 			else if (errno == EPERM)
 				bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
 		}
 		// We couldn't free this earlier becase fsType could be in buf.
 		if(ENABLE_FEATURE_CLEAN_UP) {
 			free(buf);
 			free(blockDevice);
 			free(directory);
 		}
 		if(!all) break;
 	}

 	if(file) endmntent(file);
 	if(rc) bb_perror_msg("Mounting %s on %s failed", blockDevice, directory);

 	return rc;
 }
	/* vi: set sw=4 ts=4: */
	/*
	* Mini mount implementation for busybox
	*
	* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
	* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
	* Copyright (C) 2005 by Rob Landley <rob@landley.net>
	*
	* 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
	*
	*/

	#include <limits.h>
	#include <stdlib.h>
	#include <unistd.h>
	#include <errno.h>
	#include <string.h>
	#include <stdio.h>
	#include <mntent.h>
	#include <ctype.h>
	#include <sys/mount.h>
	#include <fcntl.h> // for CONFIG_FEATURE_MOUNT_LOOP
	#include <sys/ioctl.h> // for CONFIG_FEATURE_MOUNT_LOOP
	#include "busybox.h"

	/* This is just a warning of a common mistake. Possibly this should be a
	* uclibc faq entry rather than in busybox... */
	#if ENABLE_FEATURE_MOUNT_NFS && defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
	#error "You need to build uClibc with UCLIBC_HAS_RPC for busybox mount with NFS support to compile."
	#endif

	// These two aren't always defined in old headers
	#ifndef MS_BIND
	#define MS_BIND 4096
	#endif
	#ifndef MS_MOVE
	#define MS_MOVE 8192
	#endif

	/* Consume standard mount options (from -o options or --options).
	* Set appropriate flags and collect unrecognized ones as a comma separated
	* string to pass to kernel */

	struct {
	const char *name;
	long flags;
	} static const mount_options[] = {
	{"loop", 0},
	{"defaults", 0},
	{"noauto", 0},
	{"ro", MS_RDONLY},
	{"rw", ~MS_RDONLY},
	{"nosuid", MS_NOSUID},
	{"suid", ~MS_NOSUID},
	{"dev", ~MS_NODEV},
	{"nodev", MS_NODEV},
	{"exec", ~MS_NOEXEC},
	{"noexec", MS_NOEXEC},
	{"sync", MS_SYNCHRONOUS},
	{"async", ~MS_SYNCHRONOUS},
	{"remount", MS_REMOUNT},
	{"atime", MS_NOATIME},
	{"noatime", MS_NOATIME},
	{"diratime", MS_NODIRATIME},
	{"nodiratime", MS_NODIRATIME},
	{"bind", MS_BIND},
	{"move", MS_MOVE}
	};

	/* Uses the mount_options list above */
	static void parse_mount_options(char options, int flags, char **strflags)
	{
	// Loop through options
	for(;;) {
	int i;
	char *comma = strchr(options, ',');

	if(comma) *comma = 0;

	// Find this option in mount_options
	for(i = 0; i < (sizeof(mount_options) / sizeof(*mount_options)); i++) {
	if(!strcasecmp(mount_options[i].name, options)) {
	long fl = mount_options[i].flags;
	if(fl < 0) *flags &= fl;
	else *flags \|= fl;
	break;
	}
	}
	// Unrecognized mount option?
	if(i == (sizeof(mount_options) / sizeof(*mount_options))) {
	// Add it to strflags, to pass on to kernel
	i = strflags ? strlen(strflags) : 0;
	strflags = xrealloc(strflags, i+strlen(options)+2);
	// Comma separated if it's not the first one
	if(i) (*strflags)[i++] = ',';
	strcpy((*strflags)+i, options);
	}
	// Advance to next option, or finish
	if(comma) {
	*comma = ',';
	options = ++comma;
	} else break;
	}
	}

	/* This does the work */

	extern int mount_main(int argc, char **argv)
	{
	char string_flags = 0, fsType = 0, blockDevice = 0, directory = 0,
	loopFile = 0, buf = 0,
	*files[] = {"/etc/filesystems", "/proc/filesystems", 0};
	int i, opt, all = FALSE, fakeIt = FALSE, allowWrite = FALSE,
	rc = 1, useMtab = ENABLE_FEATURE_MTAB_SUPPORT;
	int flags=0xc0ed0000; // Needed for linux 2.2, ignored by 2.4 and 2.6.
	FILE file = 0,f = 0;
	char path[PATH_MAX*2];
	struct mntent m;
	struct stat statbuf;

	/* parse long options, like --bind and --move. Note that -o option
	* and --option are synonymous. Yes, this means --remount,rw works. */

	for(i = opt = 0; i < argc; i++) {
	if(argv[i][0] == '-' && argv[i][1] == '-')
	parse_mount_options(argv[i]+2, &flags, &string_flags);
	else argv[opt++] = argv[i];
	}
	argc = opt;

	// Parse remaining options

	while((opt = getopt(argc, argv, "o:t:rwafnv")) > 0) {
	switch (opt) {
	case 'o':
	parse_mount_options(optarg, &flags, &string_flags);
	break;
	case 't':
	fsType = optarg;
	break;
	case 'r':
	flags \|= MS_RDONLY;
	break;
	case 'w':
	allowWrite=TRUE;
	break;
	case 'a':
	all = TRUE;
	break;
	case 'f':
	fakeIt = TRUE;
	break;
	case 'n':
	useMtab = FALSE;
	break;
	case 'v':
	break; // ignore -v
	default:
	bb_show_usage();
	}
	}

	// If we have no arguments, show currently mounted filesystems

	if(!all && (optind == argc)) {
	FILE *mountTable = setmntent(bb_path_mtab_file, "r");

	if(!mountTable) bb_perror_msg_and_die(bb_path_mtab_file);

	while (getmntent_r(mountTable,&m,path,sizeof(path))) {
	blockDevice = m.mnt_fsname;

	// Clean up display a little bit regarding root devie
	if(!strcmp(blockDevice, "rootfs")) continue;
	if(!strcmp(blockDevice, "/dev/root"))
	blockDevice = find_block_device("/");

	if(!fsType \|\| !strcmp(m.mnt_type, fsType))
	printf("%s on %s type %s (%s)\n", blockDevice, m.mnt_dir,
	m.mnt_type, m.mnt_opts);
	if(ENABLE_FEATURE_CLEAN_UP && blockDevice != m.mnt_fsname)
	free(blockDevice);
	}
	endmntent(mountTable);
	return EXIT_SUCCESS;
	}

	/* The next argument is what to mount. if there's an argument after that
	* it's where to mount it. If we're not mounting all, and we have both
	* of these arguments, jump straight to the actual mount. */

	statbuf.st_mode=0;
	if(optind < argc)
	blockDevice = !stat(argv[optind], &statbuf) ?
	bb_simplify_path(argv[optind]) :
	(ENABLE_FEATURE_CLEAN_UP ? strdup(argv[optind]) : argv[optind]);
	if(optind+1 < argc) directory = bb_simplify_path(argv[optind+1]);

	// If we don't have to loop through fstab, skip ahead a bit.

	if(!all && optind+1!=argc) goto singlemount;

	// Loop through /etc/fstab entries to look up this entry.

	if(!(file=setmntent("/etc/fstab","r")))
	bb_perror_msg_and_die("\nCannot read /etc/fstab");
	for(;;) {

	// Get next fstab entry

	if(!getmntent_r(file,&m,path,sizeof(path))) {
	if(!all)
	bb_perror_msg("Can't find %s in /etc/fstab\n", blockDevice);
	break;
	}

	// If we're mounting all and all doesn't mount this one, skip it.

	if(all) {
	if(strstr(m.mnt_opts,"noauto") \|\| strstr(m.mnt_type,"swap"))
	continue;
	flags=0;

	/* If we're mounting something specific and this isn't it, skip it.
	* Note we must match both the exact text in fstab (ala "proc") or
	* a full path from root */

	} else if(strcmp(blockDevice,m.mnt_fsname) &&
	strcmp(argv[optind],m.mnt_fsname) &&
	strcmp(blockDevice,m.mnt_dir) &&
	strcmp(argv[optind],m.mnt_dir)) continue;

	/* Parse flags from /etc/fstab (unless this is a single mount
	* overriding fstab -- note the "all" test above zeroed the flags,
	* to prevent flags from previous entries affecting this one, so
	* the only way we could get here with nonzero flags is a single
	* mount). */

	if(!flags) {
	if(ENABLE_FEATURE_CLEAN_UP) free(string_flags);
	string_flags=NULL;
	parse_mount_options(m.mnt_opts, &flags, &string_flags);
	}

	/* Fill out remaining fields with info from mtab */

	if(ENABLE_FEATURE_CLEAN_UP) {
	free(blockDevice);
	blockDevice=strdup(m.mnt_fsname);
	free(directory);
	directory=strdup(m.mnt_type);
	} else {
	blockDevice=m.mnt_fsname;
	directory=m.mnt_dir;
	}
	fsType=m.mnt_type;

	/* Ok, we're ready to actually mount a specific source on a specific
	* directory now. */

	singlemount:

	// If they said -w, override fstab

	if(allowWrite) flags&=~MS_RDONLY;

	// Might this be an NFS filesystem?

	if(ENABLE_FEATURE_MOUNT_NFS && (!fsType \|\| !strcmp(fsType,"nfs")) &&
	strchr(blockDevice, ':') != NULL)
	{
	if(nfsmount(blockDevice, directory, &flags, &string_flags, 1))
	bb_perror_msg("nfsmount failed");
	else {
	rc = 0;
	fsType="nfs";
	// Strangely enough, nfsmount() doesn't actually mount()
	goto mount_it_now;
	}
	} else {

	// Do we need to allocate a loopback device?

	if(ENABLE_FEATURE_MOUNT_LOOP && !fakeIt && S_ISREG(statbuf.st_mode))
	{
	loopFile = blockDevice;
	blockDevice = 0;
	switch(set_loop(&blockDevice, loopFile, 0)) {
	case 0:
	case 1:
	break;
	default:
	bb_error_msg_and_die(
	errno == EPERM \|\| errno == EACCES ?
	bb_msg_perm_denied_are_you_root :
	"Couldn't setup loop device");
	break;
	}
	}

	/* If we know the fstype (or don't need to), jump straight
	* to the actual mount. */

	if(fsType \|\| (flags & (MS_REMOUNT \| MS_BIND \| MS_MOVE)))
	goto mount_it_now;
	}

	// Loop through filesystem types until mount succeeds or we run out

	for(i = 0; files[i] && rc; i++) {
	f = fopen(files[i], "r");
	if(!f) continue;
	// Get next block device backed filesystem
	for(buf = 0; (buf = fsType = bb_get_chomped_line_from_file(f));
	free(buf))
	{
	// Skip funky entries in /proc
	if(!strncmp(buf,"nodev",5) && isspace(buf[5])) continue;

	while(isspace(*fsType)) fsType++;
	if(buf=='#' \|\| buf=='*') continue;
	if(!*fsType) continue;
	mount_it_now:
	// Okay, try to mount

	if (!fakeIt) {
	for(;;) {
	rc = mount(blockDevice, directory, fsType, flags, string_flags);
	if(!rc \|\| (flags&MS_RDONLY) \|\| (errno!=EACCES && errno!=EROFS))
	break;
	bb_error_msg("%s is write-protected, mounting read-only", blockDevice);
	flags\|=MS_RDONLY;
	}
	}
	if(!rc \|\| !f) break;
	}
	if(f) fclose(f);
	if(!f \|\| !rc) break;
	}

	/* If the mount was sucessful, and we're maintaining an old-style
	* mtab file by hand, add new entry to it now. */
	if((!rc \|\| fakeIt) && useMtab) {
	FILE *mountTable = setmntent(bb_path_mtab_file, "a+");

	if(!mountTable) bb_perror_msg(bb_path_mtab_file);
	else {
	// Remove trailing / (if any) from directory we mounted on
	int length=strlen(directory);
	if(length>1 && directory[length-1] == '/')
	directory[length-1]=0;

	// Fill out structure (should be ok to re-use existing one).
	m.mnt_fsname=blockDevice;
	m.mnt_dir=directory;
	m.mnt_type=fsType ? : "--bind";
	m.mnt_opts=string_flags ? :
	((flags & MS_RDONLY) ? "ro" : "rw");
	m.mnt_freq = 0;
	m.mnt_passno = 0;

	// Write and close
	addmntent(mountTable, &m);
	endmntent(mountTable);
	}
	} else {
	// Mount failed. Clean up
	if(loopFile) {
	del_loop(blockDevice);
	if(ENABLE_FEATURE_CLEAN_UP) free(loopFile);
	}
	// Don't whine about already mounted fs when mounting all.
	if(rc<0 && errno == EBUSY && all) rc = 0;
	else if (errno == EPERM)
	bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
	}
	// We couldn't free this earlier becase fsType could be in buf.
	if(ENABLE_FEATURE_CLEAN_UP) {
	free(buf);
	free(blockDevice);
	free(directory);
	}
	if(!all) break;
	}

	if(file) endmntent(file);
	if(rc) bb_perror_msg("Mounting %s on %s failed", blockDevice, directory);

	return rc;
	}