James Morris [off-list ref] wrote:

quoted

 (2) A hook to snoop source specifications.  

What are source specifications?

"/dev/sda1" or "my.nfs.server:/foo/bar".

Actually, this hook is now gone.  Source specification is done by way of a
parameter with key of "source" and this can be specified multiple times if the
filesystem supports it (bcachefs for example).

David
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