Understanding the Fault Resilience of File System Checkers


Om Rameshwar Gatla and Mai Zheng, New Mexico State University


File system checkers serve as the last line of defense to recover a corrupted file system back to a consistent state. Therefore, their reliability is critically important. Motivated by real accidents, in this paper we study the behavior of file system checkers under faults. We systematically inject emulated faults to interrupt the checkers and examine the impact on the file system images. In doing so, we answer two important questions: Does running the checker after an interrupted-check successfully return the file system to a correct state? If not, what goes wrong? Our results show that there are vulnerabilities in popular file system checkers which could lead to unrecoverable data loss under faults.

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@inproceedings {203360,
author = {Om Rameshwar Gatla and Mai Zheng},
title = {Understanding the Fault Resilience of File System Checkers},
booktitle = {9th USENIX Workshop on Hot Topics in Storage and File Systems (HotStorage 17)},
year = {2017},
address = {Santa Clara, CA},
url = {https://www.usenix.org/conference/hotstorage17/program/presentation/gatla},
publisher = {USENIX Association},
month = jul