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The Investigation and Improvement on Filesystem Check

Author: LuXueShan
Tutor: DaiHuaDong
School: National University of Defense Science and Technology
Course: Computer Science and Technology
Keywords: e2fsck fsck Detect and Repair File System
CLC: TP316
Type: Master's thesis
Year: 2010
Downloads: 17
Quote: 0
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Abstract


Although the file system is increasingly robust , state-of-the-art technology ( such as logs , snapshot ) continues to mature and be applied to the file system , but the status of the file system check and repair tools are irreplaceable . Most of the current mainstream file system are equipped with appropriate detection and repair tool . FAT and NTFS file system check and repair tools CHKDSK and SCANDISK UFS file system check and repair tools fsck HFS file system and check and repair tools fsck.hfsplus etc. , and focus on ExtX file system and its corresponding detection repair tools the e2fsck . For the e2fsck defects do three improvements : First , the fan-in link node parent-child relationship repair algorithm , improved e2fsck \Second, circulatory problems for e2fsck can not detect and repair the file system directory circulating nodes bitmap -based detection algorithm has been improved , in order to compensate for the improved algorithm loop node bitmap space and lack of performance , we propose a save node loop detection algorithm . This algorithm does not require the allocation bitmap to record cycle node information , and can take advantage of the characteristics of the file system to be optimized . Third , e2fsck fix file system block \Experimental results show that e2fsck improved properly repair the fan- link nodes in a parent-child relationship and the file system directory cycle than the original algorithm , and is based on the preservation of the node number of the loop detection algorithm has significant performance advantage , while ensuring e2fsck before and after improvement overall performance fairly .

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