SolFS - An Operation-Log Versioning File System for Hash-free Efficient Mobile Cloud Backup

Explore a research presentation introducing SolFS, an innovative operation-log versioning file system designed to dramatically improve mobile cloud backup efficiency by eliminating the need for computationally expensive hash calculations. Learn how current mobile cloud backup applications waste significant CPU resources on delta synchronization through intensive hash computation to identify modified file ranges, creating performance bottlenecks on resource-constrained mobile devices. Discover SolFS's core innovation of tracking write operation logs (offset and length) since the last backup, enabling direct identification and upload of only modified data without hashing entire files. Examine the system's key technical components including per-file mergeable operation logging using extent trees to manage write operations and merge logs with contiguous or overlapping modified ranges, operation log persistence and versioning mechanisms that allow multiple cloud backup applications to maintain separate file versions without interference, and optimization techniques like compact logging and dynamic granularity to minimize memory and storage overhead. Understand how SolFS achieves hash-free file difference identification with minimal system impact while extending cloud backup application capabilities. Review comprehensive experimental results demonstrating over 90% reduction in computational overhead for both application-side and server-side operations, plus 88.8% improvement in total cloud synchronization time for updated files, making this solution particularly valuable for mobile device performance optimization and cloud storage efficiency.