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What filesystems preferentially reuse blocks from deleted files?

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linux-howto

http://unix.stackexchange.com – Related to this earlier question I asked, I'd like to know what filesystems will preferentially reuse blocks that are freed when files are deleted (if any exist)? I am only interested in stable, well-established filesystems and would prefer those that can be the boot/root partition in a Debian system (though this is not essential). edit: Responding to a comment, I'd like this behaviour because the fs is for a VM and is contained in a sparse raw image file on the host. If new blocks are allocated, the image file gradually loses it's sparseness over time as files are created/deleted/modified (HowTos)