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Recently deleted file recovery method of mobile phone F2FS file system

A file system and file deletion technology, which is applied in the field of information security technology and data recovery, can solve the problems of insufficient research on data deletion and recovery of F2FS file system and less research on data analysis, and achieve the effect of rapid recovery and improved efficiency.

Pending Publication Date: 2020-11-06
SOUTHEAST UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] The F2FS file system only supports the operation of the Linux operating system. There are few related researches on the data analysis of the F2FS file system based on the Windows operating system, and the related research on supporting the data deletion and recovery of the F2FS file system is not sufficient. Therefore, this patent is based on Windows operation. System, according to the unique read-write access mechanism and garbage collection mechanism of the F2FS file system on the mobile phone, a method for analyzing and recovering deleted file data in the F2FS file system on the mobile phone is proposed, which is of great significance for file system data forensics

Method used

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  • Recently deleted file recovery method of mobile phone F2FS file system
  • Recently deleted file recovery method of mobile phone F2FS file system
  • Recently deleted file recovery method of mobile phone F2FS file system

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Embodiment Construction

[0033] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0034] The present invention proposes a recently deleted file recovery method of the F2FS file system on the mobile phone. The present invention aims at recovering deleted data of the F2FS file system. The speed of parsing and obtaining deleted files is faster, the efficiency is higher, and the application effect is better.

[0035] As a specific embodiment of the present invention, wherein the main flow diagram of the present invention is as follows figure 1 As shown, the data structure diagram of the nat_entry entry corresponding to the root directory node of the effective CP checkpoint segment is as follows figure 2 As shown, the flow chart of the NAT node table update method based on the root directory timestamp is as follows image 3 shown, including the following steps:

[0036](1) Read the F2FS file system Superblock super block area, ...

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Abstract

The invention discloses a recently deleted file recovery method of a mobile phone F2FS file system. The method comprises the following steps: (1) reading a Superblock super block area of an F2FS filesystem, obtaining a Node Address Table node information table, a Checkpoint check point segment and an initial address of a Main Area main data area, and determining a root directory file node numberino of the F2FS file system; (2) reading a cache region in the effective Checkpoint check point segment, and completing information updating of a Node Address Table node information table by applyingan NAT node table updating method based on a root directory timestamp; (3), obtaining and analyzing a. Trash file from the updated Node Address Table node information table; (4) analyzing an inode data area of the. Trash sub-file, and obtaining a file name and an original storage path of the recently deleted file; and (5) recovering the recently deleted file stored in the. Trash file. Aiming at the aspect of recovering deleted data of the F2FS file system, the speed of analyzing and obtaining the deleted file is higher, the efficiency is higher, and the application effect is better.

Description

technical field [0001] The invention relates to the fields of information security technology and data recovery, and particularly designs a recently deleted file recovery method of a mobile phone terminal F2FS file system. Background technique [0002] As the manufacturing cost of the flash memory storage device drops significantly, the flash memory storage device is gradually replacing the traditional disk and becoming one of the main storage devices. The F2FS file system (Flash Friendly File System) adopts the log-structured file system solution, and fixes some known problems such as the snowball effect and high cleaning overhead of the old log-structured file system. It is specially designed for NAND flash memory storage media. It is a A new open source Flash file system designed for NAND-based storage devices. The F2FS file system makes better use of the performance advantages of flash memory storage devices. Huawei took the lead in adding the F2FS file system to its ow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/14G06F12/06G06F16/16
CPCG06F11/1448G06F12/06G06F16/16
Inventor 李涛翟雨佳董文哲张廷笏胡旭江致文
Owner SOUTHEAST UNIV
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