Kernel Support for Stackable File Systems

Although it is now possible to use stackable (layered) file systems in Linux, there are several issues that should be addressed to make stacking more reliable and efficient. To support stacking properly, some changes to the VFS and VM subsystems will be required. In this paper, we discuss some of the issues and solutions proposed at the Linux Storage and Filesystems workshop in February 2007, our ongoing work on stacking support for Linux, and our progress on several particular stackable file systems.

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