OverlayFS File-System Proposed For Linux 3.10 Kernel
The Overlay File-System has been in development for several years and is used by some notable Linux distributions, but has yet to be merged into the mainline Linux kernel after having to be pulled a few times in the past. The new plan is to merge OverlayFS for the Linux 3.10 kernel.
With the patches now up to their sixteenth revision, Miklos Szeredi has called upon Linus Torvalds and Al Viro (the VFS maintainer) to consider pulling OverlayFS for inclusion into the Linux 3.10 release.
Szeredi writes in his latest plea with the Linux kernel developers, "It's included in Ubuntu and openSUSE, used by OpenWrt and various other projects. I regularly get emails asking when it will be included in mainline."
Introducing the new Linux file-system is made-up of thirteen patches and the v16 revision to them can be found on the kernel mailing list.
As far as the Overlay File-System approach to a union file-system, the kernel documentation describes itself:
This document describes a prototype for a new approach to providing overlay-filesystem functionality in Linux (sometimes referred to as union-filesystems). An overlay-filesystem tries to present a filesystem which is the result over overlaying one filesystem on top of the other.Linus Torvalds looks like he may finally pull the file-system for Linux 3.10. He already responded to the thread:
Yes, I think we should just do it. It's in use, it's pretty small, and the other alternatives are worse. Let's just plan on getting this thing done with.Al's response at the moment is, "I'll post a review tonight or tomorrow. FWIW, I was not too happy with it the last time I looked, but I'll obviously need to reread the whole thing."
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