Shake is a defragmenter that runs in userspace, without the need of patching the kernel and while the system is used (for now, on GNU/Linux only).
There is nothing magic in that : it just works by rewriting fragmented files. But it has some heuristics that could make it more efficient than other tools, including defrag and, maybe, xfs_fsr.
As an example, it allows you to write find -iname '*.mp3' | sort | shake to defrag all mp3 in a directory, puting together on the disk those close in lexical order.
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