Multiple Read-Only Layers Added To OverlayFS
Written by Michael Larabel in Linux Kernel on 11 February 2015 at 07:58 AM EST. 2 Comments
LINUX KERNEL --
OverlayFS was added to the Linux 3.18 kernel and for Linux 3.19 this file-system popular to live Linux distributions gained multi-layer support. For Linux 3.20 this file-system is now having support for multiple read-only layers.

The OverlayFS changes were submitted today for the Linux 3.20 kernel. The changes for the Linux 3.20 merge window add support for handling multiple read-only layers to OverlayFS. The changes also make the writable upper-layer optional.

In total these OverlayFS "ovl" changes make up a few hundred lines of code. More details for OverlayFS users can be found via the pull request.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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