COMPRESSION AND DEDUPLICATION LAYERED DRIVER

摘要

A method, apparatus, and system for interposed file system driver is provided, which provides a logical file system on top of an existing base file system. One such interposed file system driver is a compression and deduplication layered driver (“COLD driver”). File system operations are intercepted from the operating system through the COLD driver, which is provided as an upper-level operating system driver that operates on top of an existing base file system. By processing file data through various modules, the existing base file system can be extended as a logical file system with compression, deduplication, indexing, and other functionality. The COLD driver can be implemented without requiring modifications to existing base file system structures or base file system drivers. Server deployments may thus leverage the additional file system functionality provided by the COLD driver without having to migrate to another file system.

主权项

1. A method comprising:
invoking an interposed file system driver to request one or more operations on one or more logical files in a logical file system accessible via said interposed file system driver; wherein said logical file system is associated with metadata that defines, at least in part, said logical file system, said metadata including a metadata mapping between logical files in said logical file system and base files in a base file system; performing the one or more operations, wherein performing the one or more operations includes:
accessing said metadata mapping to determine that one or more base files are mapped to said one or more logical files;accessing said one or more base files determined to be mapped to said one or more logical files; and wherein the method is performed on one or more computing devices.