Virtual File System

Virtual File System

A virtual file system (VFS) or virtual filesystem switch is an abstraction layer on top of a more concrete file system. The purpose of a VFS is to allow client applications to access different types of concrete file systems in a uniform way. A VFS can, for example, be used to access local and network storage devices transparently without the client application noticing the difference. It can be used to bridge the differences in Windows, Mac OS and Unix filesystems, so that applications can access files on local file systems of those types without having to know what type of file system they are accessing.

A VFS specifies an interface (or a "contract") between the kernel and a concrete file system. Therefore, it is easy to add support for new file system types to the kernel simply by fulfilling the contract. The terms of the contract might change incompatibly from release to release, which would require that concrete file system support be recompiled, and possibly modified before recompilation, to allow it to work with a new release of the operating system; or the supplier of the operating system might make only backward-compatible changes to the contract, so that concrete file system support built for a given release of the operating system would work with future versions of the operating system.

Read more about Virtual File System:  Implementations, Single-file Virtual File Systems

Other articles related to "virtual file system, virtual file systems, file systems, virtual, file system, systems, file":

Filesystem In Userspace - Virtual File System
... FUSE is particularly useful for writing virtual file systems ... Unlike traditional file systems that essentially save data to and retrieve data from disk, virtual filesystems do not actually store data themselves ... They act as a view or translation of an existing file system or storage device ...
Single-file Virtual File Systems - Implementation of Single-file Virtual Filesystems - Whefs
... is an Open Source C library for POSIX-compliant operating systems which provides features for accessing and manipulating a single-file virtual file system from within C and C ...

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