TRANSACTIONAL FILE SYSTEM WITH CLIENT PARTITIONING

摘要

A file system provides access to data on a storage device so that, for a given volume on the device, read-only client partitions and a read-write client partition are presented with separate but related views of the file system state (Fig. 1). Moreover, the read-only partitions (310) do not interfere with each other and do not interfere with the read-write partition (314), while the read-write partition may delay the read-only partitions (310). Access to file system blocks is provided by way of separate virtualization trees for the read-only partitions and for the read- write partition (Fig. 6) tree represents a consistent file system state. A writer tree, which has a different root pointer from the reader tree and is partially stored in main memory, represents the state of in-progress file system transactions. When a set of file system transactions is committed, the writer tree root pointer is copied to the reader tree root pointer.