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overlayfs: Current Status and Upcoming Future

overlayfs: Current Status and Upcoming Future

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overlay filesystem is a kind of union-filesystem for Linux which has been widely used, such as container. It is base on basic filesystem(s) and merge different layers(filesystems/directories) hierarchically into one, and share objects in basic layers between different overlay filesystems. In the past year, a lot of defects have been repaired and some new features has been added into the Linux kernel upstream, such as "constant inode number", "prevent hardlink break" and "nfs export" by Amir Goldstein, and user space program fsck.overlay is under way now. However, there are still many drawbacks for various technical reasons.
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