Atomic extent swapping for XFS

Normally, files exist in a filesystem to keep data contained within them separated; seeing data exchanged directly between files is often a sign of filesystem corruption. There are, however, use cases where it is desirable to be able to perform a controlled swap of data between a pair of files. Darrick Wong has recently posted a patch set implementing this feature for the XFS filesystem, but also making it available in a general way.

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