Fast Indexing: Support for Size-Changing Algorithms in Stackable File Systems

Stackable file systems can provide extensible file system functionality with minimal performance overhead and development cost. However, previous approaches provide only limited functionality. In particular, they do not support size-changing algorithms (SCAs), which are important and useful for many applications such as compression and encryption. We propose fast indexing, a technique for efficient support of SCAs in stackable file systems. Fast indexing provides a page mapping between file system layers in a way that can be used with any SCA. We use index files to store this mapping. Index files are designed to be recoverable if lost and add less than 0.1% disk space overhead. We have implemented fast indexing using portable stackable templates, and we have used this system to build several example file systems with SCAs. We demonstrate that fast index files have low overhead for typical user workloads such as large compilations, only 2.3% over other stacked file systems and 4.7% ove...

• Type: Conference
• Year: 2001
• Where: USENIX
• Authors: Erez Zadok, Johan M. Andersen, Ion Badulescu, Jason Nieh
• Keywords: Fast Indexing, File Systems, Operating System, Stackable File Systems, USENIX 2001