The ADvanced Systems Laboratory (ADSL)
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Refuse to Crash with Re-FUSE
Swaminathan Sundararaman,
Laxman Visampalli,
Andrea C. Arpaci-Dusseau,
Remzi H. Arpaci-Dusseau,
Department of Computer Sciences,
University of Wisconsin-Madison
Abstract:
We introduce Re-FUSE, a framework that provides support for restartable user-level file systems. Re-FUSE monitors the user-level file-system and on a crash transparently restarts the file system and restores its state; the restart process is completely transparent to applications. Re-FUSE provides transparent recovery through a combination of novel techniques, including request tagging, system-call logging, and non-interruptible system calls. We tested Re-FUSE with three popular FUSE file systems: NTFS-3g, SSHFS, and AVFS. Through experimentation, we show that Re-FUSE induces little performance overhead and can tolerate a wide range of file-system crashes. More critically, Re-FUSE does so with minimal modiļ¬cation of existing FUSE file systems, thus improving robustness to crashes without mandating intrusive changes.
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