OverlayFS

OverlayFS
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

In computing, OverlayFS, a filesystem service for Linux, 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 relate 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]

While most of Live CD linux distribution uses Aufs at November 2016, Slackware uses overlayfs for live CD.[4]

OverlayFS supports whiteouts and opaque directories in the upper filesystem to allow file and directory deletion.[3]

References

  1. ↑ "OverlayFS commit to Linux".
  2. ↑ "OverlayFS Proposed For The Linux 3.18 Kernel".
  3. 1 2 "OverlayFS documentation". kernel.org.
  4. ↑ http://docs.slackware.com/slackware:liveslak

External links


This article is issued from Wikipedia - version of the 11/28/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.