File Operations

Operations with complete filesystems are an important aspect of the VFS layer but occur comparatively rarely — because, with the exception of removable devices, filesystems are mounted during the boot process and are unmounted at shutdown. More usual are frequently repeated operations on files by all system processes.

To permit universal access to files regardless of the filesystem used, the VFS provides interface functions for file processing in the form of various system calls as already noted above. This section concentrates on the most common operations performed by processes when working with files.

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