CFS-20 Design Specification

This design document outlines the implementation of the CFS-20 (Clustered File System) within the TOPS-20 operating system environment. It details the distributed architecture designed to allow multiple processors to share a common file system.

Key areas covered include: * CFSSRV Kernel: The low-level routines responsible for the resource manager, the 'voter' system for managing distributed state, and connection management via SCA. * Resource Management: Details on hash-based resource tracking, the use of long vs. short resource blocks, and the crucial role of the file access token. * Distributed Operations: Mechanisms for file system synchronization, including how global locks, directory locks, and structure mounting are managed across nodes. * Concurrency and Transaction Control: Explanation of how the system handles atomicity in a decentralized environment using transaction numbers to maintain data consistency. * Operational Aspects: How the system handles node connections, reconfigurations, and temporary features for distributed file system support.