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A method for recovering deleted data in jfs file system

A file system and data deletion technology, applied in the file system, redundant data error detection, file/folder operation, etc. Effect

Active Publication Date: 2019-10-01
XIAMEN MEIYA PICO INFORMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing deleted data recovery technology of the JFS file system must be under the Linux operating system, through the log export tool provided by the JFS file system, to export the log file and manually restore the deleted file, which will inevitably lead to low efficiency and low accuracy.

Method used

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  • A method for recovering deleted data in jfs file system
  • A method for recovering deleted data in jfs file system
  • A method for recovering deleted data in jfs file system

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Experimental program
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Embodiment 1

[0048] Please refer to Figure 1-5 , Embodiment 1 of the present invention is:

[0049] The layout of the JFS file system is as follows figure 1As shown, the JFS file system is mainly composed of reserved area, main aggregation super block, aggregation, auxiliary aggregation super block, block allocation mapping table, file set, Fsck work area, and embedded log area. The main aggregation super block mainly describes the overall layout and distribution of the JFS file system, and gathers large block information. The aggregation and file set are the main parts of the JFS file system. The files stored in the JFS file system are described by the file set. Fsck work area It is used to detect whether the JFS file system is working normally, and the embedded log is used to record the operation information of the metadata stored in the JFS file system. The embedded log structure of the JFS file system is as follows: figure 2 As shown, the embedded log includes the log attribute he...

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Abstract

The invention discloses a method for restoring deleted data of a journaling file system (JFS). The method comprises the steps that a journal record is obtained, and the JFS is analyzed; it is determined that subfile entries of the journal record are mounted in a directory entry obtained through analysis; subfile entries of the directory entry obtained through analysis are compared with the subfile entries of the journal record; inode information of the parts, different from the subfile entries of the journal record, of the subfile entries of the directory entry obtained through analysis is obtained; the file content of a deleted file is obtained according to a memory address in the inode information. The memory address corresponding to the deleted data can be obtained according to the journal record embedded in the JFS, and the deleted data is found according to the memory address and restored.

Description

technical field [0001] The invention relates to the field of electronic evidence collection, in particular to a method for recovering deleted data of a JFS file system. Background technique [0002] JFS (Journaling files system), also known as IBM Journaling File System, is a journaling file system created by IBM. The JFS file system is a log-based byte-level file system developed for transaction-oriented high-performance systems. It is scalable and robust, and it has fast restart capability compared to non-journaling filesystems. [0003] The JFS file system has been transplanted and is now widely used in Linux and Unix operating systems. Its data recovery technology is a hot spot in the field of information security. The existing deleted data recovery technology of the JFS file system must be under the Linux operating system, through the log export tool provided by the JFS file system, to export the log file and manually restore the deleted file, which will inevitably le...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F16/16G06F11/14
Inventor 林城沈长达吴少华吴世雄申强
Owner XIAMEN MEIYA PICO INFORMATION
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