OverlayFS
| Developer(s) | Open Source Community |
|---|---|
| Full name | Overlay File System |
| Features | |
| File system permissions | POSIX |
| Other | |
| Supported operating systems | Linux, FreeBSD and NetBSD |
OverlayFS is a filesystem service for Linux which implements a union mount for other file systems.
It was merged into the Linux kernel mainline in 2014, in kernel version 3.18.[1][2]
The main mechanics of OverlayFS relates to the merging of directory access when both filesystems present a directory for the same name. Otherwise, OverlayFS presents the object, if any, yielded by one or the other, with the "upper" filesystem taking precedence. Unlike some other overlay filesystems, the directory subtrees being merged by OverlayFS do not necessarily have to be from distinct filesystems.[3]
OverlayFS supports whiteouts and opaque directories in the upper filesystem to allow file and directory deletion.[3]
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