| Developer(s) | Miklos Szeredi, open-source community |
|---|---|
| Full name | Overlay File System |
| Features | |
| File system permissions | POSIX |
| Other | |
| Supported operating systems | Linux, FreeBSD and NetBSD[citation needed] |
OverlayFS is a union mount filesystem implementation for Linux. It combines multiple different underlying mount points into one, resulting in single directory structure that contains underlying files and sub-directories from all sources. Common applications overlay a read/write partition over a read-only partition, such as with LiveCDs and IoT devices with limited flash memory write cycles.