ramfs - Debian Wiki
Ramfs is a very simple FileSystem that exports Linux's disk caching mechanisms (the page cache and dentry cache) as a dynamically resizable ram-based filesystem. Normally all files are cached in memory by Linux. Pages of data read from backing store (usually the ?block_device the filesystem is mounted on) are kept around in case it's needed again, but marked as clean (freeable) in case the Virtual
Unioning file systems: Architecture, features, and design choices [LWN.net]
Unioning file systems: Architecture, features, and design choices A unioning file system combines the namespaces of two or more file systems together to produce a single merged namespace. This is useful for things like a live CD/DVD: you can union-mount a small, writable file system on top of a read-only DVD file system and have a usable system without needing to transfer the system files from the
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