Data Virtualization Layer for Read-Only Storage

A virtualization layer is introduced as an intermediary between the read-only source data and the processes requiring write access. This layer intercepts I/O requests and manages a cache of modified data, allowing write operations without duplicating the entire data set. The virtualization layer acts as a mediator that enables write capability while maintaining the original read-only source, thus resolving the contradiction between write accessibility and storage space consumption.

The virtualization layer performs preliminary actions by pre-loading data into a cache and maintaining a mapping between virtual addresses and physical locations. When write requests arrive, the system can quickly locate and modify cached data without needing to search through or copy large portions of the source data. This preliminary preparation of the data structure enables fast write operations and restoration, resolving the time loss contradiction.

The virtualization layer provides universal access to multiple processes through a single unified interface. Instead of creating separate copies for each process, the virtualization layer manages a shared cache that serves multiple processes simultaneously. Each process can request write access through the same virtualization layer, which handles the caching and modification management centrally. This multi-functional approach enables multi-process write access without proportionally increasing storage requirements, resolving the contradiction between adaptability and quantity of substance.