partition.cpp

/*
	Copyright 2013 to 2017 TeamWin
	This file is part of TWRP/TeamWin Recovery Project.

	TWRP 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 3 of the License, or
	(at your option) any later version.

	TWRP 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 TWRP.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/vfs.h>
#include <sys/mount.h>
#include <unistd.h>
#include <dirent.h>
#include <libgen.h>
#include <zlib.h>
#include <iostream>
#include <sstream>
#include <sys/param.h>
#include <fcntl.h>

#ifdef TW_INCLUDE_CRYPTO
	#include "cutils/properties.h"
#endif

#include "libblkid/include/blkid.h"
#include "variables.h"
#include "twcommon.h"
#include "partitions.hpp"
#include "data.hpp"
#include "twrp-functions.hpp"
#include "twrpTar.hpp"
#include "exclude.hpp"
#include "infomanager.hpp"
#include "set_metadata.h"
#include "gui/gui.hpp"
#include "adbbu/libtwadbbu.hpp"
extern "C" {
	#include "mtdutils/mtdutils.h"
	#include "mtdutils/mounts.h"
#ifdef USE_EXT4
	// #include "make_ext4fs.h" TODO need ifdef for android8
	#include <ext4_utils/make_ext4fs.h>
#endif

#ifdef TW_INCLUDE_CRYPTO
	#include "crypto/lollipop/cryptfs.h"
	#include "gpt/gpt.h"
	#ifdef TW_INCLUDE_FBE
		#include "crypto/ext4crypt/Decrypt.h"
	#endif
#else
	#define CRYPT_FOOTER_OFFSET 0x4000
#endif
}
#include <selinux/selinux.h>
#include <selinux/label.h>
#ifdef HAVE_CAPABILITIES
#include <sys/capability.h>
#include <sys/xattr.h>
#include <linux/xattr.h>
#endif
#include <sparse_format.h>
#include "progresstracking.hpp"

using namespace std;

static int auto_index = 0; // v2 fstab allows you to specify a mount point of "auto" with no /. These items are given a mount point of /auto* where * == auto_index

extern struct selabel_handle *selinux_handle;
extern bool datamedia;

struct flag_list {
	const char *name;
	unsigned long flag;
};

const struct flag_list mount_flags[] = {
	{ "noatime",          MS_NOATIME },
	{ "noexec",           MS_NOEXEC },
	{ "nosuid",           MS_NOSUID },
	{ "nodev",            MS_NODEV },
	{ "nodiratime",       MS_NODIRATIME },
	{ "ro",               MS_RDONLY },
	{ "rw",               0 },
	{ "remount",          MS_REMOUNT },
	{ "bind",             MS_BIND },
	{ "rec",              MS_REC },
#ifdef MS_UNBINDABLE
	{ "unbindable",       MS_UNBINDABLE },
#endif
#ifdef MS_PRIVATE
	{ "private",          MS_PRIVATE },
#endif
#ifdef MS_SLAVE
	{ "slave",            MS_SLAVE },
#endif
#ifdef MS_SHARED
	{ "shared",           MS_SHARED },
#endif
	{ "sync",             MS_SYNCHRONOUS },
	{ 0,                  0 },
};

const char *ignored_mount_items[] = {
	"defaults=",
	"errors=",
	NULL
};

enum TW_FSTAB_FLAGS {
	TWFLAG_DEFAULTS, // Retain position
	TWFLAG_ANDSEC,
	TWFLAG_BACKUP,
	TWFLAG_BACKUPNAME,
	TWFLAG_BLOCKSIZE,
	TWFLAG_CANBEWIPED,
	TWFLAG_CANENCRYPTBACKUP,
	TWFLAG_DISPLAY,
	TWFLAG_ENCRYPTABLE,
	TWFLAG_FILEENCRYPTION,
	TWFLAG_FLASHIMG,
	TWFLAG_FORCEENCRYPT,
	TWFLAG_FSFLAGS,
	TWFLAG_IGNOREBLKID,
	TWFLAG_LENGTH,
	TWFLAG_MOUNTTODECRYPT,
	TWFLAG_REMOVABLE,
	TWFLAG_RETAINLAYOUTVERSION,
	TWFLAG_SETTINGSSTORAGE,
	TWFLAG_STORAGE,
	TWFLAG_STORAGENAME,
	TWFLAG_SUBPARTITIONOF,
	TWFLAG_SYMLINK,
	TWFLAG_USERDATAENCRYPTBACKUP,
	TWFLAG_USERMRF,
	TWFLAG_WIPEDURINGFACTORYRESET,
	TWFLAG_WIPEINGUI,
	TWFLAG_SLOTSELECT,
	TWFLAG_WAIT,
	TWFLAG_VERIFY,
	TWFLAG_CHECK,
	TWFLAG_ALTDEVICE,
	TWFLAG_NOTRIM,
	TWFLAG_VOLDMANAGED,
	TWFLAG_FORMATTABLE,
	TWFLAG_RESIZE,
};

/* Flags without a trailing '=' are considered dual format flags and can be
 * written as either 'flagname' or 'flagname=', where the character following
 * the '=' is Y,y,1 for true and false otherwise.
 */
const struct flag_list tw_flags[] = {
	{ "andsec",                 TWFLAG_ANDSEC },
	{ "backup",                 TWFLAG_BACKUP },
	{ "backupname=",            TWFLAG_BACKUPNAME },
	{ "blocksize=",             TWFLAG_BLOCKSIZE },
	{ "canbewiped",             TWFLAG_CANBEWIPED },
	{ "canencryptbackup",       TWFLAG_CANENCRYPTBACKUP },
	{ "defaults",               TWFLAG_DEFAULTS },
	{ "display=",               TWFLAG_DISPLAY },
	{ "encryptable=",           TWFLAG_ENCRYPTABLE },
	{ "fileencryption=",        TWFLAG_FILEENCRYPTION },
	{ "flashimg",               TWFLAG_FLASHIMG },
	{ "forceencrypt=",          TWFLAG_FORCEENCRYPT },
	{ "fsflags=",               TWFLAG_FSFLAGS },
	{ "ignoreblkid",            TWFLAG_IGNOREBLKID },
	{ "length=",                TWFLAG_LENGTH },
	{ "mounttodecrypt",         TWFLAG_MOUNTTODECRYPT },
	{ "removable",              TWFLAG_REMOVABLE },
	{ "retainlayoutversion",    TWFLAG_RETAINLAYOUTVERSION },
	{ "settingsstorage",        TWFLAG_SETTINGSSTORAGE },
	{ "storage",                TWFLAG_STORAGE },
	{ "storagename=",           TWFLAG_STORAGENAME },
	{ "subpartitionof=",        TWFLAG_SUBPARTITIONOF },
	{ "symlink=",               TWFLAG_SYMLINK },
	{ "userdataencryptbackup",  TWFLAG_USERDATAENCRYPTBACKUP },
	{ "usermrf",                TWFLAG_USERMRF },
	{ "wipeduringfactoryreset", TWFLAG_WIPEDURINGFACTORYRESET },
	{ "wipeingui",              TWFLAG_WIPEINGUI },
	{ "slotselect",             TWFLAG_SLOTSELECT },
	{ "wait",                   TWFLAG_WAIT },
	{ "verify",                 TWFLAG_VERIFY },
	{ "check",                  TWFLAG_CHECK },
	{ "altdevice",              TWFLAG_ALTDEVICE },
	{ "notrim",                 TWFLAG_NOTRIM },
	{ "voldmanaged=",           TWFLAG_VOLDMANAGED },
	{ "formattable",            TWFLAG_FORMATTABLE },
	{ "resize",                 TWFLAG_RESIZE },
	{ 0,                        0 },
};

TWPartition::TWPartition() {
	Can_Be_Mounted = false;
	Can_Be_Wiped = false;
	Can_Be_Backed_Up = false;
	Use_Rm_Rf = false;
	Wipe_During_Factory_Reset = false;
	Wipe_Available_in_GUI = false;
	Is_SubPartition = false;
	Has_SubPartition = false;
	SubPartition_Of = "";
	Symlink_Path = "";
	Symlink_Mount_Point = "";
	Mount_Point = "";
	Backup_Path = "";
	Wildcard_Block_Device = false;
	Sysfs_Entry = "";
	Actual_Block_Device = "";
	Primary_Block_Device = "";
	Alternate_Block_Device = "";
	Removable = false;
	Is_Present = false;
	Length = 0;
	Size = 0;
	Used = 0;
	Free = 0;
	Backup_Size = 0;
	Can_Be_Encrypted = false;
	Is_Encrypted = false;
	Is_Decrypted = false;
	Is_FBE = false;
	Mount_To_Decrypt = false;
	Decrypted_Block_Device = "";
	Display_Name = "";
	Backup_Display_Name = "";
	Storage_Name = "";
	Backup_Name = "";
	Backup_FileName = "";
	MTD_Name = "";
	Backup_Method = BM_NONE;
	Can_Encrypt_Backup = false;
	Use_Userdata_Encryption = false;
	Has_Data_Media = false;
	Has_Android_Secure = false;
	Is_Storage = false;
	Is_Settings_Storage = false;
	Storage_Path = "";
	Current_File_System = "";
	Fstab_File_System = "";
	Mount_Flags = 0;
	Mount_Options = "";
	Format_Block_Size = 0;
	Ignore_Blkid = false;
	Retain_Layout_Version = false;
	Crypto_Key_Location = "footer";
	MTP_Storage_ID = 0;
	Can_Flash_Img = false;
	Mount_Read_Only = false;
	Is_Adopted_Storage = false;
	Adopted_GUID = "";
	SlotSelect = false;
}

TWPartition::~TWPartition(void) {
	// Do nothing
}

bool TWPartition::Process_Fstab_Line(const char *fstab_line, bool Display_Error, std::map<string, Flags_Map> *twrp_flags) {
	char full_line[MAX_FSTAB_LINE_LENGTH];
	char twflags[MAX_FSTAB_LINE_LENGTH] = "";
	char* ptr;
	int line_len = strlen(fstab_line), index = 0, item_index = 0;
	bool skip = false;
	int fstab_version = 1, mount_point_index = 0, fs_index = 1, block_device_index = 2;
	TWPartition *additional_entry = NULL;
	std::map<string, Flags_Map>::iterator it;

	strlcpy(full_line, fstab_line, sizeof(full_line));
	for (index = 0; index < line_len; index++) {
		if (full_line[index] == 34)
			skip = !skip;
		if (!skip && full_line[index] <= 32)
			full_line[index] = '\0';
	}
	if (line_len < 10)
		return false; // There can't possibly be a valid fstab line that is less than 10 chars
	if (strncmp(fstab_line, "/dev/", strlen("/dev/")) == 0 || strncmp(fstab_line, "/devices/", strlen("/devices/")) == 0) {
		fstab_version = 2;
		block_device_index = 0;
		mount_point_index = 1;
		fs_index = 2;
	}

	index = 0;
	while (index < line_len) {
		while (index < line_len && full_line[index] == '\0')
			index++;
		if (index >= line_len)
			continue;
		ptr = full_line + index;
		if (item_index == mount_point_index) {
			Mount_Point = ptr;
			if (fstab_version == 2) {
				additional_entry = PartitionManager.Find_Partition_By_Path(Mount_Point);
				if (additional_entry) {
					LOGINFO("Found an additional entry for '%s'\n", Mount_Point.c_str());
				}
			}
			LOGINFO("Processing '%s'\n", Mount_Point.c_str());
			Backup_Path = Mount_Point;
			Storage_Path = Mount_Point;
			Display_Name = ptr + 1;
			Backup_Display_Name = Display_Name;
			Storage_Name = Display_Name;
			item_index++;
		} else if (item_index == fs_index) {
			// File System
			Fstab_File_System = ptr;
			Current_File_System = ptr;
			item_index++;
		} else if (item_index == block_device_index) {
			// Primary Block Device
			if (Fstab_File_System == "mtd" || Fstab_File_System == "yaffs2") {
				MTD_Name = ptr;
				Find_MTD_Block_Device(MTD_Name);
			} else if (Fstab_File_System == "bml") {
				if (Mount_Point == "/boot")
					MTD_Name = "boot";
				else if (Mount_Point == "/recovery")
					MTD_Name = "recovery";
				Primary_Block_Device = ptr;
				if (*ptr != '/')
					LOGERR("Until we get better BML support, you will have to find and provide the full block device path to the BML devices e.g. /dev/block/bml9 instead of the partition name\n");
			} else if (*ptr != '/') {
				if (Display_Error)
					LOGERR("Invalid block device '%s' in fstab line '%s'", ptr, fstab_line);
				else
					LOGINFO("Invalid block device '%s' in fstab line '%s'", ptr, fstab_line);
				return false;
			} else {
				Primary_Block_Device = ptr;
				Find_Real_Block_Device(Primary_Block_Device, Display_Error);
			}
			item_index++;
		} else if (item_index > 2) {
			if (fstab_version == 2) {
				if (item_index == 3) {
					Process_FS_Flags(ptr);
					if (additional_entry) {
						additional_entry->Save_FS_Flags(Fstab_File_System, Mount_Flags, Mount_Options);
						return false; // We save the extra fs flags in the other partition entry and by returning false, this entry will be deleted
					}
				} else {
					strlcpy(twflags, ptr, sizeof(twflags));
				}
				item_index++;
			} else if (*ptr == '/') { // v2 fstab does not allow alternate block devices
				// Alternate Block Device
				Alternate_Block_Device = ptr;
				Find_Real_Block_Device(Alternate_Block_Device, Display_Error);
			} else if (strlen(ptr) > 7 && strncmp(ptr, "length=", 7) == 0) {
				// Partition length
				ptr += 7;
				Length = atoi(ptr);
			} else if (strlen(ptr) > 6 && strncmp(ptr, "flags=", 6) == 0) {
				// Custom flags, save for later so that new values aren't overwritten by defaults
				ptr += 6;
				strlcpy(twflags, ptr, sizeof(twflags));
			} else if (strlen(ptr) == 4 && (strncmp(ptr, "NULL", 4) == 0 || strncmp(ptr, "null", 4) == 0 || strncmp(ptr, "null", 4) == 0)) {
				// Do nothing
			} else {
				// Unhandled data
				LOGINFO("Unhandled fstab information '%s' in fstab line '%s'\n", ptr, fstab_line);
			}
		}
		while (index < line_len && full_line[index] != '\0')
			index++;
	}

	// override block devices from the v2 fstab with the ones we read from the twrp.flags file in case they are different
	if (fstab_version == 2 && twrp_flags && twrp_flags->size() > 0) {
		it = twrp_flags->find(Mount_Point);
		if (it != twrp_flags->end()) {
			if (!it->second.Primary_Block_Device.empty()) {
				Primary_Block_Device = it->second.Primary_Block_Device;
				Find_Real_Block_Device(Primary_Block_Device, Display_Error);
			}
			if (!it->second.Alternate_Block_Device.empty()) {
				Alternate_Block_Device = it->second.Alternate_Block_Device;
				Find_Real_Block_Device(Alternate_Block_Device, Display_Error);
			}
		}
	}

	if (strncmp(fstab_line, "/devices/", strlen("/devices/")) == 0) {
		Sysfs_Entry = Primary_Block_Device;
		Primary_Block_Device = "";
		Is_Storage = true;
		Removable = true;
		Wipe_Available_in_GUI = true;
		Wildcard_Block_Device = true;
	}
	if (Primary_Block_Device.find("*") != string::npos)
		Wildcard_Block_Device = true;

	if (Mount_Point == "auto") {
		Mount_Point = "/auto";
		char autoi[5];
		sprintf(autoi, "%i", auto_index);
		Mount_Point += autoi;
		Backup_Path = Mount_Point;
		Storage_Path = Mount_Point;
		auto_index++;
		Setup_File_System(Display_Error);
		Display_Name = "Storage";
		Backup_Display_Name = Display_Name;
		Storage_Name = Display_Name;
		Can_Be_Backed_Up = false;
		Wipe_Available_in_GUI = true;
		Is_Storage = true;
		Removable = true;
		Wipe_Available_in_GUI = true;
	} else if (!Is_File_System(Fstab_File_System) && !Is_Image(Fstab_File_System)) {
		if (Display_Error)
			LOGERR("Unknown File System: '%s'\n", Fstab_File_System.c_str());
		else
			LOGINFO("Unknown File System: '%s'\n", Fstab_File_System.c_str());
		return false;
	} else if (Is_File_System(Fstab_File_System)) {
		Find_Actual_Block_Device();
		Setup_File_System(Display_Error);
		if (Mount_Point == "/system") {
			Display_Name = "System";
			Backup_Display_Name = Display_Name;
			Storage_Name = Display_Name;
			Wipe_Available_in_GUI = true;
			Can_Be_Backed_Up = true;
			Mount_Read_Only = true;
		} else if (Mount_Point == "/data") {
			Display_Name = "Data";
			Backup_Display_Name = Display_Name;
			Storage_Name = Display_Name;
			Wipe_Available_in_GUI = true;
			Wipe_During_Factory_Reset = true;
			Can_Be_Backed_Up = true;
			Can_Encrypt_Backup = true;
			Use_Userdata_Encryption = true;
		} else if (Mount_Point == "/cache") {
			Display_Name = "Cache";
			Backup_Display_Name = Display_Name;
			Storage_Name = Display_Name;
			Wipe_Available_in_GUI = true;
			Wipe_During_Factory_Reset = true;
			Can_Be_Backed_Up = true;
		} else if (Mount_Point == "/datadata") {
			Wipe_During_Factory_Reset = true;
			Display_Name = "DataData";
			Backup_Display_Name = Display_Name;
			Storage_Name = Display_Name;
			Is_SubPartition = true;
			SubPartition_Of = "/data";
			DataManager::SetValue(TW_HAS_DATADATA, 1);
			Can_Be_Backed_Up = true;
			Can_Encrypt_Backup = true;
			Use_Userdata_Encryption = false; // This whole partition should be encrypted
		} else if (Mount_Point == "/sd-ext") {
			Wipe_During_Factory_Reset = true;
			Display_Name = "SD-Ext";
			Backup_Display_Name = Display_Name;
			Storage_Name = Display_Name;
			Wipe_Available_in_GUI = true;
			Removable = true;
			Can_Be_Backed_Up = true;
			Can_Encrypt_Backup = true;
			Use_Userdata_Encryption = true;
		} else if (Mount_Point == "/boot") {
			Display_Name = "Boot";
			Backup_Display_Name = Display_Name;
			DataManager::SetValue("tw_boot_is_mountable", 1);
			Can_Be_Backed_Up = true;
		} else if (Mount_Point == "/vendor") {
			Display_Name = "Vendor";
			Backup_Display_Name = Display_Name;
			Storage_Name = Display_Name;
			Mount_Read_Only = true;
		}
#ifdef TW_EXTERNAL_STORAGE_PATH
		if (Mount_Point == EXPAND(TW_EXTERNAL_STORAGE_PATH)) {
			Is_Storage = true;
			Storage_Path = EXPAND(TW_EXTERNAL_STORAGE_PATH);
			Removable = true;
			Wipe_Available_in_GUI = true;
#else
		if (Mount_Point == "/sdcard" || Mount_Point == "/external_sd" || Mount_Point == "/external_sdcard") {
			Is_Storage = true;
			Removable = true;
			Wipe_Available_in_GUI = true;
#endif
		}
#ifdef TW_INTERNAL_STORAGE_PATH
		if (Mount_Point == EXPAND(TW_INTERNAL_STORAGE_PATH)) {
			Is_Storage = true;
			Is_Settings_Storage = true;
			Storage_Path = EXPAND(TW_INTERNAL_STORAGE_PATH);
			Wipe_Available_in_GUI = true;
		}
#else
		if (Mount_Point == "/emmc" || Mount_Point == "/internal_sd" || Mount_Point == "/internal_sdcard") {
			Is_Storage = true;
			Is_Settings_Storage = true;
			Wipe_Available_in_GUI = true;
		}
#endif
	} else if (Is_Image(Fstab_File_System)) {
		Find_Actual_Block_Device();
		Setup_Image();
		if (Mount_Point == "/boot") {
			Display_Name = "Boot";
			Backup_Display_Name = Display_Name;
			Can_Be_Backed_Up = true;
			Can_Flash_Img = true;
		} else if (Mount_Point == "/recovery") {
			Display_Name = "Recovery";
			Backup_Display_Name = Display_Name;
			Can_Flash_Img = true;
		} else if (Mount_Point == "/system_image") {
			Display_Name = "System Image";
			Backup_Display_Name = Display_Name;
			Can_Flash_Img = true;
			Can_Be_Backed_Up = true;
		} else if (Mount_Point == "/vendor_image") {
			Display_Name = "Vendor Image";
			Backup_Display_Name = Display_Name;
			Can_Flash_Img = true;
			Can_Be_Backed_Up = true;
		}
	}

	// Process TWRP fstab flags
	if (strlen(twflags) > 0) {
		string Prev_Display_Name = Display_Name;
		string Prev_Storage_Name = Storage_Name;
		string Prev_Backup_Display_Name = Backup_Display_Name;
		Display_Name = "";
		Storage_Name = "";
		Backup_Display_Name = "";

		Process_TW_Flags(twflags, (fstab_version == 1), fstab_version);
		Save_FS_Flags(Fstab_File_System, Mount_Flags, Mount_Options);

		bool has_display_name = !Display_Name.empty();
		bool has_storage_name = !Storage_Name.empty();
		bool has_backup_name = !Backup_Display_Name.empty();
		if (!has_display_name) Display_Name = Prev_Display_Name;
		if (!has_storage_name) Storage_Name = Prev_Storage_Name;
		if (!has_backup_name) Backup_Display_Name = Prev_Backup_Display_Name;

		if (has_display_name && !has_storage_name)
			Storage_Name = Display_Name;
		if (!has_display_name && has_storage_name)
			Display_Name = Storage_Name;
		if (has_display_name && !has_backup_name && Backup_Display_Name != "Android Secure")
			Backup_Display_Name = Display_Name;
		if (!has_display_name && has_backup_name)
			Display_Name = Backup_Display_Name;
	}

	if (fstab_version == 2 && twrp_flags && twrp_flags->size() > 0) {
		it = twrp_flags->find(Mount_Point);
		if (it != twrp_flags->end()) {
			char twrpflags[MAX_FSTAB_LINE_LENGTH] = "";
			int skip = 0;
			string Flags = it->second.Flags;
			strcpy(twrpflags, Flags.c_str());
			if (strlen(twrpflags) > strlen("flags=") && strncmp(twrpflags, "flags=", strlen("flags=")) == 0)
				skip += strlen("flags=");
			char* flagptr = twrpflags;
			flagptr += skip;
			Process_TW_Flags(flagptr, Display_Error, 1); // Forcing the fstab to ver 1 because this data is coming from the /etc/twrp.flags which should be using the TWRP v1 flags format
		}
	}

	if (Mount_Point == "/persist" && Can_Be_Mounted) {
		bool mounted = Is_Mounted();
		if (mounted || Mount(false)) {
			// Read the backup settings file
			DataManager::LoadPersistValues();
			TWFunc::Fixup_Time_On_Boot("/persist/time/");
			if (!mounted)
				UnMount(false);
		}
	}

	return true;
}

void TWPartition::Partition_Post_Processing(bool Display_Error) {
	if (Mount_Point == "/data")
		Setup_Data_Partition(Display_Error);
	else if (Mount_Point == "/cache")
		Setup_Cache_Partition(Display_Error);
}

void TWPartition::ExcludeAll(const string& path) {
	backup_exclusions.add_absolute_dir(path);
	wipe_exclusions.add_absolute_dir(path);
}

void TWPartition::Setup_Data_Partition(bool Display_Error) {
	if (Mount_Point != "/data")
		return;

	// Ensure /data is not mounted as tmpfs for qcom hardware decrypt
	UnMount(false);

#ifdef TW_INCLUDE_CRYPTO
	if (datamedia)
		Setup_Data_Media();
	Can_Be_Encrypted = true;
	char crypto_blkdev[255];
	property_get("ro.crypto.fs_crypto_blkdev", crypto_blkdev, "error");
	if (strcmp(crypto_blkdev, "error") != 0) {
		DataManager::SetValue(TW_IS_DECRYPTED, 1);
		Is_Encrypted = true;
		Is_Decrypted = true;
		Is_FBE = false;
		DataManager::SetValue(TW_IS_FBE, 0);
		Decrypted_Block_Device = crypto_blkdev;
		LOGINFO("Data already decrypted, new block device: '%s'\n", crypto_blkdev);
	} else if (!Mount(false)) {
		if (Is_Present) {
			set_partition_data(Actual_Block_Device.c_str(), Crypto_Key_Location.c_str(), Fstab_File_System.c_str());
			if (cryptfs_check_footer() == 0) {
				Is_Encrypted = true;
				Is_Decrypted = false;
				Can_Be_Mounted = false;
				Current_File_System = "emmc";
				Setup_Image();
				DataManager::SetValue(TW_IS_ENCRYPTED, 1);
				DataManager::SetValue(TW_CRYPTO_PWTYPE, cryptfs_get_password_type());
				DataManager::SetValue(TW_CRYPTO_PASSWORD, "");
				DataManager::SetValue("tw_crypto_display", "");
			} else {
				gui_err("mount_data_footer=Could not mount /data and unable to find crypto footer.");
			}
		} else {
			LOGERR("Primary block device '%s' for mount point '%s' is not present!\n", Primary_Block_Device.c_str(), Mount_Point.c_str());
		}
	} else {
		if (TWFunc::Path_Exists("/data/unencrypted/key/version")) {
			LOGINFO("File Based Encryption is present\n");
#ifdef TW_INCLUDE_FBE
			ExcludeAll(Mount_Point + "/convert_fbe");
			ExcludeAll(Mount_Point + "/unencrypted");
			//ExcludeAll(Mount_Point + "/system/users/0"); // we WILL need to retain some of this if multiple users are present or we just need to delete more folders for the extra users somewhere else
			ExcludeAll(Mount_Point + "/misc/vold/user_keys");
			//ExcludeAll(Mount_Point + "/system_ce");
			//ExcludeAll(Mount_Point + "/system_de");
			//ExcludeAll(Mount_Point + "/misc_ce");
			//ExcludeAll(Mount_Point + "/misc_de");
			ExcludeAll(Mount_Point + "/system/gatekeeper.password.key");
			ExcludeAll(Mount_Point + "/system/gatekeeper.pattern.key");
			ExcludeAll(Mount_Point + "/system/locksettings.db");
			//ExcludeAll(Mount_Point + "/system/locksettings.db-shm"); // don't seem to need this one, but the other 2 are needed
			ExcludeAll(Mount_Point + "/system/locksettings.db-wal");
			//ExcludeAll(Mount_Point + "/user_de");
			//ExcludeAll(Mount_Point + "/misc/profiles/cur/0"); // might be important later
			ExcludeAll(Mount_Point + "/misc/gatekeeper");
			ExcludeAll(Mount_Point + "/misc/keystore");
			ExcludeAll(Mount_Point + "/drm/kek.dat");
			ExcludeAll(Mount_Point + "/system_de/0/spblob"); // contains data needed to decrypt pixel 2
			int retry_count = 3;
			while (!Decrypt_DE() && --retry_count)
				usleep(2000);
			if (retry_count > 0) {
				property_set("ro.crypto.state", "encrypted");
				Is_Encrypted = true;
				Is_Decrypted = false;
				Is_FBE = true;
				DataManager::SetValue(TW_IS_FBE, 1);
				DataManager::SetValue(TW_IS_ENCRYPTED, 1);
				string filename;
				int pwd_type = Get_Password_Type(0, filename);
				if (pwd_type < 0) {
					LOGERR("This TWRP does not have synthetic password decrypt support\n");
					pwd_type = 0; // default password
				}
				DataManager::SetValue(TW_CRYPTO_PWTYPE, pwd_type);
				DataManager::SetValue(TW_CRYPTO_PASSWORD, "");
				DataManager::SetValue("tw_crypto_display", "");
			}
#else
			LOGERR("FBE found but FBE support not present in TWRP\n");
#endif
		} else {
			// Filesystem is not encrypted and the mount succeeded, so return to
			// the original unmounted state
			UnMount(false);
		}
	}
	if (datamedia && (!Is_Encrypted || (Is_Encrypted && Is_Decrypted))) {
		Setup_Data_Media();
		Recreate_Media_Folder();
	}
#else
	if (datamedia) {
		Setup_Data_Media();
		Recreate_Media_Folder();
	}
#endif
}

void TWPartition::Setup_Cache_Partition(bool Display_Error __unused) {
	if (Mount_Point != "/cache")
		return;

	if (!Mount(true))
		return;

	if (!TWFunc::Path_Exists("/cache/recovery/.")) {
		LOGINFO("Recreating /cache/recovery folder\n");
		if (mkdir("/cache/recovery", S_IRWXU | S_IRWXG | S_IWGRP | S_IXGRP) != 0)
			LOGERR("Could not create /cache/recovery\n");
	}
}

void TWPartition::Process_FS_Flags(const char *str) {
	char *options = strdup(str);
	char *ptr, *savep;

	Mount_Options = "";

	// Avoid issues with potentially nested strtok by using strtok_r
	for (ptr = strtok_r(options, ",", &savep); ptr; ptr = strtok_r(NULL, ",", &savep)) {
		char *equals = strstr(ptr, "=");
		size_t name_len;

		if (!equals)
			name_len = strlen(ptr);
		else
			name_len = equals - ptr;

		// There are some flags that we want to ignore in TWRP
		bool found_match = false;
		for (const char** ignored_mount_item = ignored_mount_items; *ignored_mount_item; ignored_mount_item++) {
			if (strncmp(ptr, *ignored_mount_item, name_len) == 0) {
				found_match = true;
				break;
			}
		}
		if (found_match)
			continue;

		// mount_flags are never postfixed by '='
		if (!equals) {
			const struct flag_list* mount_flag = mount_flags;
			for (; mount_flag->name; mount_flag++) {
				if (strcmp(ptr, mount_flag->name) == 0) {
					if (mount_flag->flag == MS_RDONLY)
						Mount_Read_Only = true;
					else
						Mount_Flags |= (unsigned)mount_flag->flag;
					found_match = true;
					break;
				}
			}
			if (found_match)
				continue;
		}

		// If we aren't ignoring this flag and it's not a mount flag, then it must be a mount option
		if (!Mount_Options.empty())
			Mount_Options += ",";
		Mount_Options += ptr;
	}
	free(options);
}

void TWPartition::Save_FS_Flags(const string& local_File_System, int local_Mount_Flags, const string& local_Mount_Options) {
	partition_fs_flags_struct flags;
	flags.File_System = local_File_System;
	flags.Mount_Flags = local_Mount_Flags;
	flags.Mount_Options = local_Mount_Options;
	fs_flags.push_back(flags);
}

void TWPartition::Apply_TW_Flag(const unsigned flag, const char* str, const bool val) {
	switch (flag) {
		case TWFLAG_ANDSEC:
			Has_Android_Secure = val;
			break;
		case TWFLAG_BACKUP:
			Can_Be_Backed_Up = val;
			break;
		case TWFLAG_BACKUPNAME:
			Backup_Display_Name = str;
			break;
		case TWFLAG_BLOCKSIZE:
			Format_Block_Size = (unsigned long)(atol(str));
			break;
		case TWFLAG_CANBEWIPED:
			Can_Be_Wiped = val;
			break;
		case TWFLAG_CANENCRYPTBACKUP:
			Can_Encrypt_Backup = val;
			break;
		case TWFLAG_DEFAULTS:
		case TWFLAG_WAIT:
		case TWFLAG_VERIFY:
		case TWFLAG_CHECK:
		case TWFLAG_NOTRIM:
		case TWFLAG_VOLDMANAGED:
		case TWFLAG_RESIZE:
			// Do nothing
			break;
		case TWFLAG_DISPLAY:
			Display_Name = str;
			break;
		case TWFLAG_ENCRYPTABLE:
		case TWFLAG_FORCEENCRYPT:
			Crypto_Key_Location = str;
			break;
		case TWFLAG_FILEENCRYPTION:
			// This flag isn't used by TWRP but is needed in 9.0 FBE decrypt
			// fileencryption=ice:aes-256-heh
			{
				std::string FBE = str;
				std::string FBE_contents, FBE_filenames;
				size_t colon_loc = FBE.find(":");
				if (colon_loc == std::string::npos) {
					LOGINFO("Invalid fileencryption fstab flag: '%s'\n", str);
					break;
				}
				FBE_contents = FBE.substr(0, colon_loc);
				FBE_filenames = FBE.substr(colon_loc + 1);
				property_set("fbe.contents", FBE_contents.c_str());
				property_set("fbe.filenames", FBE_filenames.c_str());
				LOGINFO("FBE contents '%s', filenames '%s'\n", FBE_contents.c_str(), FBE_filenames.c_str());
			}
			break;
		case TWFLAG_FLASHIMG:
			Can_Flash_Img = val;
			break;
		case TWFLAG_FSFLAGS:
			Process_FS_Flags(str);
			break;
		case TWFLAG_IGNOREBLKID:
			Ignore_Blkid = val;
			break;
		case TWFLAG_LENGTH:
			Length = atoi(str);
			break;
		case TWFLAG_MOUNTTODECRYPT:
			Mount_To_Decrypt = val;
			break;
		case TWFLAG_REMOVABLE:
			Removable = val;
			break;
		case TWFLAG_RETAINLAYOUTVERSION:
			Retain_Layout_Version = val;
			break;
		case TWFLAG_SETTINGSSTORAGE:
			Is_Settings_Storage = val;
			if (Is_Settings_Storage)
				Is_Storage = true;
			break;
		case TWFLAG_STORAGE:
			Is_Storage = val;
			break;
		case TWFLAG_STORAGENAME:
			Storage_Name = str;
			break;
		case TWFLAG_SUBPARTITIONOF:
			Is_SubPartition = true;
			SubPartition_Of = str;
			break;
		case TWFLAG_SYMLINK:
			Symlink_Path = str;
			break;
		case TWFLAG_USERDATAENCRYPTBACKUP:
			Use_Userdata_Encryption = val;
			if (Use_Userdata_Encryption)
				Can_Encrypt_Backup = true;
			break;
		case TWFLAG_USERMRF:
			Use_Rm_Rf = val;
			break;
		case TWFLAG_WIPEDURINGFACTORYRESET:
			Wipe_During_Factory_Reset = val;
			if (Wipe_During_Factory_Reset) {
				Can_Be_Wiped = true;
				Wipe_Available_in_GUI = true;
			}
			break;
		case TWFLAG_WIPEINGUI:
		case TWFLAG_FORMATTABLE:
			Wipe_Available_in_GUI = val;
			if (Wipe_Available_in_GUI)
				Can_Be_Wiped = true;
			break;
		case TWFLAG_SLOTSELECT:
			SlotSelect = true;
			break;
		case TWFLAG_ALTDEVICE:
			Alternate_Block_Device = str;
			break;
		default:
			// Should not get here
			LOGINFO("Flag identified for processing, but later unmatched: %i\n", flag);
			break;
	}
}

void TWPartition::Process_TW_Flags(char *flags, bool Display_Error, int fstab_ver) {
	char separator[2] = {'\n', 0};
	char *ptr, *savep;
	char source_separator = ';';

	if (fstab_ver == 2)
		source_separator = ',';

	// Semicolons within double-quotes are not forbidden, so replace
	// only the semicolons intended as separators with '\n' for strtok
	for (unsigned i = 0, skip = 0; i < strlen(flags); i++) {
		if (flags[i] == '\"')
			skip = !skip;
		if (!skip && flags[i] == source_separator)
			flags[i] = separator[0];
	}

	// Avoid issues with potentially nested strtok by using strtok_r
	ptr = strtok_r(flags, separator, &savep);
	while (ptr) {
		int ptr_len = strlen(ptr);
		const struct flag_list* tw_flag = tw_flags;

		for (; tw_flag->name; tw_flag++) {
			int flag_len = strlen(tw_flag->name);

			if (strncmp(ptr, tw_flag->name, flag_len) == 0) {
				bool flag_val = false;

				if (ptr_len > flag_len && (tw_flag->name)[flag_len-1] != '='
						&& ptr[flag_len] != '=') {
					// Handle flags with same starting string
					// (e.g. backup and backupname)
					continue;
				} else if (ptr_len > flag_len && ptr[flag_len] == '=') {
					// Handle flags with dual format: Part 1
					// (e.g. backup and backup=y. backup=y handled here)
					ptr += flag_len + 1;
					TWFunc::Strip_Quotes(ptr);
					// Skip flags with empty argument
					// (e.g. backup=)
					if (strlen(ptr) == 0) {
						LOGINFO("Flag missing argument or should not include '=': %s=\n", tw_flag->name);
						break;
					}
					flag_val = strchr("yY1", *ptr) != NULL;
				} else if (ptr_len == flag_len
						&& (tw_flag->name)[flag_len-1] == '=') {
					// Skip flags missing argument after =
					// (e.g. backupname=)
					LOGINFO("Flag missing argument: %s\n", tw_flag->name);
					break;
				} else if (ptr_len > flag_len
						&& (tw_flag->name)[flag_len-1] == '=') {
					// Handle arguments to flags
					// (e.g. backupname="My Stuff")
					ptr += flag_len;
					TWFunc::Strip_Quotes(ptr);
					// Skip flags with empty argument
					// (e.g. backupname="")
					if (strlen(ptr) == 0) {
						LOGINFO("Flag missing argument: %s\n", tw_flag->name);
						break;
					}
				} else if (ptr_len == flag_len) {
					// Handle flags with dual format: Part 2
					// (e.g. backup and backup=y. backup handled here)
					flag_val = true;
				} else {
					LOGINFO("Flag matched, but could not be processed: %s\n", ptr);
					break;
				}

				Apply_TW_Flag(tw_flag->flag, ptr, flag_val);
				break;
			}
		}
		if (tw_flag->name == 0) {
			if (Display_Error)
				LOGERR("Unhandled flag: '%s'\n", ptr);
			else
				LOGINFO("Unhandled flag: '%s'\n", ptr);
		}
		ptr = strtok_r(NULL, separator, &savep);
	}
}

bool TWPartition::Is_File_System(string File_System) {
	if (File_System == "ext2" ||
		File_System == "ext3" ||
		File_System == "ext4" ||
		File_System == "vfat" ||
		File_System == "ntfs" ||
		File_System == "yaffs2" ||
		File_System == "exfat" ||
		File_System == "f2fs" ||
		File_System == "auto")
		return true;
	else
		return false;
}

bool TWPartition::Is_Image(string File_System) {
	if (File_System == "emmc" || File_System == "mtd" || File_System == "bml")
		return true;
	else
		return false;
}

bool TWPartition::Make_Dir(string Path, bool Display_Error) {
	if (TWFunc::Get_D_Type_From_Stat(Path) != S_IFDIR)
		unlink(Path.c_str());
	if (!TWFunc::Path_Exists(Path)) {
		if (mkdir(Path.c_str(), 0777) == -1) {
			if (Display_Error)
				gui_msg(Msg(msg::kError, "create_folder_strerr=Can not create '{1}' folder ({2}).")(Path)(strerror(errno)));
			else
				LOGINFO("Can not create '%s' folder.\n", Path.c_str());
			return false;
		} else {
			LOGINFO("Created '%s' folder.\n", Path.c_str());
			return true;
		}
	}
	return true;
}

void TWPartition::Setup_File_System(bool Display_Error) {
	Can_Be_Mounted = true;
	Can_Be_Wiped = true;

	// Make the mount point folder if it doesn't exist
	Make_Dir(Mount_Point, Display_Error);
	Display_Name = Mount_Point.substr(1, Mount_Point.size() - 1);
	Backup_Name = Display_Name;
	Backup_Method = BM_FILES;
}

void TWPartition::Setup_Image() {
	Display_Name = Mount_Point.substr(1, Mount_Point.size() - 1);
	Backup_Name = Display_Name;
	if (Current_File_System == "emmc")
		Backup_Method = BM_DD;
	else if (Current_File_System == "mtd" || Current_File_System == "bml")
		Backup_Method = BM_FLASH_UTILS;
	else
		LOGINFO("Unhandled file system '%s' on image '%s'\n", Current_File_System.c_str(), Display_Name.c_str());
}

void TWPartition::Setup_AndSec(void) {
	Backup_Display_Name = "Android Secure";
	Backup_Name = "and-sec";
	Can_Be_Backed_Up = true;
	Has_Android_Secure = true;
	Symlink_Path = Mount_Point + "/.android_secure";
	Symlink_Mount_Point = "/and-sec";
	Backup_Path = Symlink_Mount_Point;
	Make_Dir("/and-sec", true);
	Recreate_AndSec_Folder();
	Mount_Storage_Retry(true);
}

void TWPartition::Setup_Data_Media() {
	LOGINFO("Setting up '%s' as data/media emulated storage.\n", Mount_Point.c_str());
	if (Storage_Name.empty() || Storage_Name == "Data")
		Storage_Name = "Internal Storage";
	Has_Data_Media = true;
	Is_Storage = true;
	Storage_Path = Mount_Point + "/media";
	Symlink_Path = Storage_Path;
	if (Mount_Point == "/data") {
		Is_Settings_Storage = true;
		if (strcmp(EXPAND(TW_EXTERNAL_STORAGE_PATH), "/sdcard") == 0) {
			Make_Dir("/emmc", false);
			Symlink_Mount_Point = "/emmc";
		} else {
			Make_Dir("/sdcard", false);
			Symlink_Mount_Point = "/sdcard";
		}
		if (Mount(false) && TWFunc::Path_Exists(Mount_Point + "/media/0")) {
			Storage_Path = Mount_Point + "/media/0";
			Symlink_Path = Storage_Path;
			DataManager::SetValue(TW_INTERNAL_PATH, Mount_Point + "/media/0");
			UnMount(true);
		}
		DataManager::SetValue("tw_has_internal", 1);
		DataManager::SetValue("tw_has_data_media", 1);
		backup_exclusions.add_absolute_dir("/data/data/com.google.android.music/files");
		wipe_exclusions.add_absolute_dir(Mount_Point + "/misc/vold"); // adopted storage keys
		ExcludeAll(Mount_Point + "/.layout_version");
		ExcludeAll(Mount_Point + "/system/storage.xml");
	} else {
		if (Mount(true) && TWFunc::Path_Exists(Mount_Point + "/media/0")) {
			Storage_Path = Mount_Point + "/media/0";
			Symlink_Path = Storage_Path;
			UnMount(true);
		}
	}
	ExcludeAll(Mount_Point + "/media");
}

void TWPartition::Find_Real_Block_Device(string& Block, bool Display_Error) {
	char device[PATH_MAX], realDevice[PATH_MAX];

	strcpy(device, Block.c_str());
	memset(realDevice, 0, sizeof(realDevice));
	while (readlink(device, realDevice, sizeof(realDevice)) > 0)
	{
		strcpy(device, realDevice);
		memset(realDevice, 0, sizeof(realDevice));
	}

	if (device[0] != '/') {
		if (Display_Error)
			LOGERR("Invalid symlink path '%s' found on block device '%s'\n", device, Block.c_str());
		else
			LOGINFO("Invalid symlink path '%s' found on block device '%s'\n", device, Block.c_str());
		return;
	} else {
		Block = device;
		return;
	}
}

bool TWPartition::Mount_Storage_Retry(bool Display_Error) {
	// On some devices, storage doesn't want to mount right away, retry and sleep
	if (!Mount(Display_Error)) {
		int retry_count = 5;
		while (retry_count > 0 && !Mount(false)) {
			usleep(500000);
			retry_count--;
		}
		return Mount(Display_Error);
	}
	return true;
}

bool TWPartition::Find_MTD_Block_Device(string MTD_Name) {
	FILE *fp = NULL;
	char line[255];

	fp = fopen("/proc/mtd", "rt");
	if (fp == NULL) {
		LOGERR("Device does not support /proc/mtd\n");
		return false;
	}

	while (fgets(line, sizeof(line), fp) != NULL)
	{
		char device[32], label[32];
		unsigned long size = 0;
		int deviceId;

		sscanf(line, "%s %lx %*s %*c%s", device, &size, label);

		// Skip header and blank lines
		if ((strcmp(device, "dev:") == 0) || (strlen(line) < 8))
			continue;

		// Strip off the trailing " from the label
		label[strlen(label)-1] = '\0';

		if (strcmp(label, MTD_Name.c_str()) == 0) {
			// We found our device
			// Strip off the trailing : from the device
			device[strlen(device)-1] = '\0';
			if (sscanf(device,"mtd%d", &deviceId) == 1) {
				sprintf(device, "/dev/block/mtdblock%d", deviceId);
				Primary_Block_Device = device;
				fclose(fp);
				return true;
			}
		}
	}
	fclose(fp);

	return false;
}

bool TWPartition::Get_Size_Via_statfs(bool Display_Error) {
	struct statfs st;
	string Local_Path = Mount_Point + "/.";

	if (!Mount(Display_Error))
		return false;

	if (statfs(Local_Path.c_str(), &st) != 0) {
		if (!Removable) {
			if (Display_Error)
				LOGERR("Unable to statfs '%s'\n", Local_Path.c_str());
			else
				LOGINFO("Unable to statfs '%s'\n", Local_Path.c_str());
		}
		return false;
	}
	Size = (st.f_blocks * st.f_bsize);
	Used = ((st.f_blocks - st.f_bfree) * st.f_bsize);
	Free = (st.f_bfree * st.f_bsize);
	Backup_Size = Used;
	return true;
}

bool TWPartition::Get_Size_Via_df(bool Display_Error) {
	FILE* fp;
	char command[255], line[512];
	int include_block = 1;
	unsigned int min_len;

	if (!Mount(Display_Error))
		return false;

	min_len = Actual_Block_Device.size() + 2;
	sprintf(command, "df %s > /tmp/dfoutput.txt", Mount_Point.c_str());
	TWFunc::Exec_Cmd(command);
	fp = fopen("/tmp/dfoutput.txt", "rt");
	if (fp == NULL) {
		LOGINFO("Unable to open /tmp/dfoutput.txt.\n");
		return false;
	}

	while (fgets(line, sizeof(line), fp) != NULL)
	{
		unsigned long blocks, used, available;
		char device[64];
		char tmpString[64];

		if (strncmp(line, "Filesystem", 10) == 0)
			continue;
		if (strlen(line) < min_len) {
			include_block = 0;
			continue;
		}
		if (include_block) {
			sscanf(line, "%s %lu %lu %lu", device, &blocks, &used, &available);
		} else {
			// The device block string is so long that the df information is on the next line
			int space_count = 0;
			sprintf(tmpString, "/dev/block/%s", Actual_Block_Device.c_str());
			while (tmpString[space_count] == 32)
				space_count++;
			sscanf(line + space_count, "%lu %lu %lu", &blocks, &used, &available);
		}

		// Adjust block size to byte size
		Size = blocks * 1024ULL;
		Used = used * 1024ULL;
		Free = available * 1024ULL;
		Backup_Size = Used;
	}
	fclose(fp);
	return true;
}

unsigned long long TWPartition::IOCTL_Get_Block_Size() {
	Find_Actual_Block_Device();

	return TWFunc::IOCTL_Get_Block_Size(Actual_Block_Device.c_str());
}

bool TWPartition::Find_Partition_Size(void) {
	FILE* fp;
	char line[512];
	string tmpdevice;

	fp = fopen("/proc/dumchar_info", "rt");
	if (fp != NULL) {
		while (fgets(line, sizeof(line), fp) != NULL)
		{
			char label[32], device[32];
			unsigned long size = 0;

			sscanf(line, "%s %lx %*x %*u %s", label, &size, device);

			// Skip header, annotation	and blank lines
			if ((strncmp(device, "/dev/", 5) != 0) || (strlen(line) < 8))
				continue;

			tmpdevice = "/dev/";
			tmpdevice += label;
			if (tmpdevice == Primary_Block_Device || tmpdevice == Alternate_Block_Device) {
				Size = size;
				fclose(fp);
				return true;
			}
		}
	}

	unsigned long long ioctl_size = IOCTL_Get_Block_Size();
	if (ioctl_size) {
		Size = ioctl_size;
		return true;
	}

	// In this case, we'll first get the partitions we care about (with labels)
	fp = fopen("/proc/partitions", "rt");
	if (fp == NULL)
		return false;

	while (fgets(line, sizeof(line), fp) != NULL)
	{
		unsigned long major, minor, blocks;
		char device[512];

		if (strlen(line) < 7 || line[0] == 'm')	 continue;
		sscanf(line + 1, "%lu %lu %lu %s", &major, &minor, &blocks, device);

		tmpdevice = "/dev/block/";
		tmpdevice += device;
		if (tmpdevice == Primary_Block_Device || tmpdevice == Alternate_Block_Device) {
			// Adjust block size to byte size
			Size = blocks * 1024ULL;
			fclose(fp);
			return true;
		}
	}
	fclose(fp);
	return false;
}

bool TWPartition::Is_Mounted(void) {
	if (!Can_Be_Mounted)
		return false;

	struct stat st1, st2;
	string test_path;

	// Check to see if the mount point directory exists
	test_path = Mount_Point + "/.";
	if (stat(test_path.c_str(), &st1) != 0)  return false;

	// Check to see if the directory above the mount point exists
	test_path = Mount_Point + "/../.";
	if (stat(test_path.c_str(), &st2) != 0)  return false;

	// Compare the device IDs -- if they match then we're (probably) using tmpfs instead of an actual device
	int ret = (st1.st_dev != st2.st_dev) ? true : false;

	return ret;
}

bool TWPartition::Is_File_System_Writable(void) {
	if (!Is_File_System(Current_File_System) || !Is_Mounted())
		return false;

	string test_path = Mount_Point + "/.";
	return (access(test_path.c_str(), W_OK) == 0);
}

bool TWPartition::Mount(bool Display_Error) {
	int exfat_mounted = 0;
	unsigned long flags = Mount_Flags;

	if (Is_Mounted()) {
		return true;
	} else if (!Can_Be_Mounted) {
		return false;
	}

	Find_Actual_Block_Device();

	// Check the current file system before mounting
	Check_FS_Type();
	if (Current_File_System == "exfat" && TWFunc::Path_Exists("/sbin/exfat-fuse")) {
		string cmd = "/sbin/exfat-fuse -o big_writes,max_read=131072,max_write=131072 " + Actual_Block_Device + " " + Mount_Point;
		LOGINFO("cmd: %s\n", cmd.c_str());
		string result;
		if (TWFunc::Exec_Cmd(cmd, result) != 0) {
			LOGINFO("exfat-fuse failed to mount with result '%s', trying vfat\n", result.c_str());
			Current_File_System = "vfat";
		} else {
#ifdef TW_NO_EXFAT_FUSE
			UnMount(false);
			// We'll let the kernel handle it but using exfat-fuse to detect if the file system is actually exfat
			// Some kernels let us mount vfat as exfat which doesn't work out too well
#else
			exfat_mounted = 1;
#endif
		}
	}

	if (Current_File_System == "ntfs" && (TWFunc::Path_Exists("/sbin/ntfs-3g") || TWFunc::Path_Exists("/sbin/mount.ntfs"))) {
		string cmd;
		string Ntfsmount_Binary = "";

		if (TWFunc::Path_Exists("/sbin/ntfs-3g"))
			Ntfsmount_Binary = "ntfs-3g";
		else if (TWFunc::Path_Exists("/sbin/mount.ntfs"))
			Ntfsmount_Binary = "mount.ntfs";

		if (Mount_Read_Only)
			cmd = "/sbin/" + Ntfsmount_Binary + " -o ro " + Actual_Block_Device + " " + Mount_Point;
		else
			cmd = "/sbin/" + Ntfsmount_Binary + " " + Actual_Block_Device + " " + Mount_Point;
		LOGINFO("cmd: '%s'\n", cmd.c_str());

		if (TWFunc::Exec_Cmd(cmd) == 0) {
			return true;
		} else {
			LOGINFO("ntfs-3g failed to mount, trying regular mount method.\n");
		}
	}

	if (Mount_Read_Only)
		flags |= MS_RDONLY;

	if (Fstab_File_System == "yaffs2") {
		// mount an MTD partition as a YAFFS2 filesystem.
		flags = MS_NOATIME | MS_NODEV | MS_NODIRATIME;
		if (Mount_Read_Only)
			flags |= MS_RDONLY;
		if (mount(Actual_Block_Device.c_str(), Mount_Point.c_str(), Fstab_File_System.c_str(), flags, NULL) < 0) {
			if (mount(Actual_Block_Device.c_str(), Mount_Point.c_str(), Fstab_File_System.c_str(), flags | MS_RDONLY, NULL) < 0) {
				if (Display_Error)
					gui_msg(Msg(msg::kError, "fail_mount=Failed to mount '{1}' ({2})")(Mount_Point)(strerror(errno)));
				else
					LOGINFO("Failed to mount '%s' (MTD)\n", Mount_Point.c_str());
				return false;
			} else {
				LOGINFO("Mounted '%s' (MTD) as RO\n", Mount_Point.c_str());
				return true;
			}
		} else {
			struct stat st;
			string test_path = Mount_Point;
			if (stat(test_path.c_str(), &st) < 0) {
				if (Display_Error)
					gui_msg(Msg(msg::kError, "fail_mount=Failed to mount '{1}' ({2})")(Mount_Point)(strerror(errno)));
				else
					LOGINFO("Failed to mount '%s' (MTD)\n", Mount_Point.c_str());
				return false;
			}
			mode_t new_mode = st.st_mode | S_IXUSR | S_IXGRP | S_IXOTH;
			if (new_mode != st.st_mode) {
				LOGINFO("Fixing execute permissions for %s\n", Mount_Point.c_str());
				if (chmod(Mount_Point.c_str(), new_mode) < 0) {
					if (Display_Error)
						LOGERR("Couldn't fix permissions for %s: %s\n", Mount_Point.c_str(), strerror(errno));
					else
						LOGINFO("Couldn't fix permissions for %s: %s\n", Mount_Point.c_str(), strerror(errno));
					return false;
				}
			}
			return true;
		}
	}

	string mount_fs = Current_File_System;
	if (Current_File_System == "exfat" && TWFunc::Path_Exists("/sys/module/texfat"))
		mount_fs = "texfat";

	if (!exfat_mounted &&
		mount(Actual_Block_Device.c_str(), Mount_Point.c_str(), mount_fs.c_str(), flags, Mount_Options.c_str()) != 0 &&
		mount(Actual_Block_Device.c_str(), Mount_Point.c_str(), mount_fs.c_str(), flags, NULL) != 0) {
#ifdef TW_NO_EXFAT_FUSE
		if (Current_File_System == "exfat") {
			LOGINFO("Mounting exfat failed, trying vfat...\n");
			if (mount(Actual_Block_Device.c_str(), Mount_Point.c_str(), "vfat", 0, NULL) != 0) {
				if (Display_Error)
					gui_msg(Msg(msg::kError, "fail_mount=Failed to mount '{1}' ({2})")(Mount_Point)(strerror(errno)));
				else
					LOGINFO("Unable to mount '%s'\n", Mount_Point.c_str());
				LOGINFO("Actual block device: '%s', current file system: '%s', flags: 0x%8x, options: '%s'\n", Actual_Block_Device.c_str(), Current_File_System.c_str(), flags, Mount_Options.c_str());
				return false;
			}
		} else {
#endif
			if (!Removable && Display_Error)
				gui_msg(Msg(msg::kError, "fail_mount=Failed to mount '{1}' ({2})")(Mount_Point)(strerror(errno)));
			else
				LOGINFO("Unable to mount '%s'\n", Mount_Point.c_str());
			LOGINFO("Actual block device: '%s', current file system: '%s'\n", Actual_Block_Device.c_str(), Current_File_System.c_str());
			return false;
#ifdef TW_NO_EXFAT_FUSE
		}
#endif
	}

	if (Removable)
		Update_Size(Display_Error);

	if (!Symlink_Mount_Point.empty() && TWFunc::Path_Exists(Symlink_Path)) {
		string Command = "mount -o bind '" + Symlink_Path + "' '" + Symlink_Mount_Point + "'";
		TWFunc::Exec_Cmd(Command);
	}
	return true;
}

bool TWPartition::UnMount(bool Display_Error) {
	if (Is_Mounted()) {
		int never_unmount_system;

		DataManager::GetValue(TW_DONT_UNMOUNT_SYSTEM, never_unmount_system);
		if (never_unmount_system == 1 && Mount_Point == "/system")
			return true; // Never unmount system if you're not supposed to unmount it

		if (Is_Storage && MTP_Storage_ID > 0)
			PartitionManager.Remove_MTP_Storage(MTP_Storage_ID);

		if (!Symlink_Mount_Point.empty())
			umount(Symlink_Mount_Point.c_str());

		umount(Mount_Point.c_str());
		if (Is_Mounted()) {
			if (Display_Error)
				gui_msg(Msg(msg::kError, "fail_unmount=Failed to unmount '{1}' ({2})")(Mount_Point)(strerror(errno)));
			else
				LOGINFO("Unable to unmount '%s'\n", Mount_Point.c_str());
			return false;
		} else {
			return true;
		}
	} else {
		return true;
	}
}

bool TWPartition::ReMount(bool Display_Error) {
	if (UnMount(Display_Error))
		return Mount(Display_Error);
	return false;
}

bool TWPartition::ReMount_RW(bool Display_Error) {
	// No need to remount if already mounted rw
	if (Is_File_System_Writable())
		return true;

	bool ro = Mount_Read_Only;
	int flags = Mount_Flags;

	Mount_Read_Only = false;
	Mount_Flags &= ~MS_RDONLY;

	bool ret = ReMount(Display_Error);

	Mount_Read_Only = ro;
	Mount_Flags = flags;

	return ret;
}

bool TWPartition::Wipe(string New_File_System) {
	bool wiped = false, update_crypt = false, recreate_media = true;
	int check;
	string Layout_Filename = Mount_Point + "/.layout_version";

	if (!Can_Be_Wiped) {
		gui_msg(Msg(msg::kError, "cannot_wipe=Partition {1} cannot be wiped.")(Display_Name));
		return false;
	}

	if (Mount_Point == "/cache")
		Log_Offset = 0;

	if (Retain_Layout_Version && Mount(false) && TWFunc::Path_Exists(Layout_Filename))
		TWFunc::copy_file(Layout_Filename, "/.layout_version", 0600);
	else
		unlink("/.layout_version");

	if (Has_Data_Media && Current_File_System == New_File_System) {
		wiped = Wipe_Data_Without_Wiping_Media();
		recreate_media = false;
	} else {
		DataManager::GetValue(TW_RM_RF_VAR, check);

		if (check || Use_Rm_Rf)
			wiped = Wipe_RMRF();
		else if (New_File_System == "ext4")
			wiped = Wipe_EXT4();
		else if (New_File_System == "ext2" || New_File_System == "ext3")
			wiped = Wipe_EXT23(New_File_System);
		else if (New_File_System == "vfat")
			wiped = Wipe_FAT();
		else if (New_File_System == "exfat")
			wiped = Wipe_EXFAT();
		else if (New_File_System == "yaffs2")
			wiped = Wipe_MTD();
		else if (New_File_System == "f2fs")
			wiped = Wipe_F2FS();
		else if (New_File_System == "ntfs")
			wiped = Wipe_NTFS();
		else {
			LOGERR("Unable to wipe '%s' -- unknown file system '%s'\n", Mount_Point.c_str(), New_File_System.c_str());
			unlink("/.layout_version");
			return false;
		}
		update_crypt = wiped;
	}

	if (wiped) {
		if (Mount_Point == "/cache")
			DataManager::Output_Version();

		if (TWFunc::Path_Exists("/.layout_version") && Mount(false))
			TWFunc::copy_file("/.layout_version", Layout_Filename, 0600);

		if (update_crypt) {
			Setup_File_System(false);
			if (Is_Encrypted && !Is_Decrypted) {
				// just wiped an encrypted partition back to its unencrypted state
				Is_Encrypted = false;
				Is_Decrypted = false;
				Decrypted_Block_Device = "";
				if (Mount_Point == "/data") {
					DataManager::SetValue(TW_IS_ENCRYPTED, 0);
					DataManager::SetValue(TW_IS_DECRYPTED, 0);
				}
			}
		}

		if (Has_Data_Media && recreate_media) {
			Recreate_Media_Folder();
		}
		if (Is_Storage && Mount(false))
			PartitionManager.Add_MTP_Storage(MTP_Storage_ID);
	}

	return wiped;
}

bool TWPartition::Wipe() {
	if (Is_File_System(Current_File_System))
		return Wipe(Current_File_System);
	else
		return Wipe(Fstab_File_System);
}

bool TWPartition::Wipe_AndSec(void) {
	if (!Has_Android_Secure)
		return false;

	if (!Mount(true))
		return false;

	gui_msg(Msg("wiping=Wiping {1}")(Backup_Display_Name));
	TWFunc::removeDir(Mount_Point + "/.android_secure/", true);
	return true;
}

bool TWPartition::Can_Repair() {
	if (Mount_Read_Only)
		return false;
	if (Current_File_System == "vfat" && TWFunc::Path_Exists("/sbin/fsck.fat"))
		return true;
	else if ((Current_File_System == "ext2" || Current_File_System == "ext3" || Current_File_System == "ext4") && TWFunc::Path_Exists("/sbin/e2fsck"))
		return true;
	else if (Current_File_System == "exfat" && TWFunc::Path_Exists("/sbin/fsck.exfat"))
		return true;
	else if (Current_File_System == "f2fs" && TWFunc::Path_Exists("/sbin/fsck.f2fs"))
		return true;
	else if (Current_File_System == "ntfs" && (TWFunc::Path_Exists("/sbin/ntfsfix") || TWFunc::Path_Exists("/sbin/fsck.ntfs")))
		return true;
	return false;
}

bool TWPartition::Repair() {
	string command;

	if (Current_File_System == "vfat") {
		if (!TWFunc::Path_Exists("/sbin/fsck.fat")) {
			gui_msg(Msg(msg::kError, "repair_not_exist={1} does not exist! Cannot repair!")("fsck.fat"));
			return false;
		}
		if (!UnMount(true))
			return false;
		gui_msg(Msg("repairing_using=Repairing {1} using {2}...")(Display_Name)("fsck.fat"));
		Find_Actual_Block_Device();
		command = "/sbin/fsck.fat -y " + Actual_Block_Device;
		LOGINFO("Repair command: %s\n", command.c_str());
		if (TWFunc::Exec_Cmd(command) == 0) {
			gui_msg("done=Done.");
			return true;
		} else {
			gui_msg(Msg(msg::kError, "unable_repair=Unable to repair {1}.")(Display_Name));
			return false;
		}
	}
	if (Current_File_System == "ext2" || Current_File_System == "ext3" || Current_File_System == "ext4") {
		if (!TWFunc::Path_Exists("/sbin/e2fsck")) {
			gui_msg(Msg(msg::kError, "repair_not_exist={1} does not exist! Cannot repair!")("e2fsck"));
			return false;
		}
		if (!UnMount(true))
			return false;
		gui_msg(Msg("repairing_using=Repairing {1} using {2}...")(Display_Name)("e2fsck"));
		Find_Actual_Block_Device();
		command = "/sbin/e2fsck -fp " + Actual_Block_Device;
		LOGINFO("Repair command: %s\n", command.c_str());
		if (TWFunc::Exec_Cmd(command) == 0) {
			gui_msg("done=Done.");
			return true;
		} else {
			gui_msg(Msg(msg::kError, "unable_repair=Unable to repair {1}.")(Display_Name));
			return false;
		}
	}
	if (Current_File_System == "exfat") {
		if (!TWFunc::Path_Exists("/sbin/fsck.exfat")) {
			gui_msg(Msg(msg::kError, "repair_not_exist={1} does not exist! Cannot repair!")("fsck.exfat"));
			return false;
		}
		if (!UnMount(true))
			return false;
		gui_msg(Msg("repairing_using=Repairing {1} using {2}...")(Display_Name)("fsck.exfat"));
		Find_Actual_Block_Device();
		command = "/sbin/fsck.exfat " + Actual_Block_Device;
		LOGINFO("Repair command: %s\n", command.c_str());
		if (TWFunc::Exec_Cmd(command) == 0) {
			gui_msg("done=Done.");
			return true;
		} else {
			gui_msg(Msg(msg::kError, "unable_repair=Unable to repair {1}.")(Display_Name));
			return false;
		}
	}
	if (Current_File_System == "f2fs") {
		if (!TWFunc::Path_Exists("/sbin/fsck.f2fs")) {
			gui_msg(Msg(msg::kError, "repair_not_exist={1} does not exist! Cannot repair!")("fsck.f2fs"));
			return false;
		}
		if (!UnMount(true))
			return false;
		gui_msg(Msg("repairing_using=Repairing {1} using {2}...")(Display_Name)("fsck.f2fs"));
		Find_Actual_Block_Device();
		command = "/sbin/fsck.f2fs " + Actual_Block_Device;
		LOGINFO("Repair command: %s\n", command.c_str());
		if (TWFunc::Exec_Cmd(command) == 0) {
			gui_msg("done=Done.");
			return true;
		} else {
			gui_msg(Msg(msg::kError, "unable_repair=Unable to repair {1}.")(Display_Name));
			return false;
		}
	}
	if (Current_File_System == "ntfs") {
		string Ntfsfix_Binary;
		if (TWFunc::Path_Exists("/sbin/ntfsfix"))
			Ntfsfix_Binary = "ntfsfix";
		else if (TWFunc::Path_Exists("/sbin/fsck.ntfs"))
			Ntfsfix_Binary = "fsck.ntfs";
		else {
			gui_msg(Msg(msg::kError, "repair_not_exist={1} does not exist! Cannot repair!")("ntfsfix"));
			return false;
		}
		if (!UnMount(true))
			return false;