rsync: failed verification -- update discarded. No data available (61)

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Sample error:

ERROR: config/sdcardfs/ failed verification -- update discarded.
rsync: read errors mapping "/config/sdcardfs/": No data available (61


pseudo file systems

See the content of /proc/filesystems. It includes a list of filesystems. Those with nodev in front are pseudo filesystems. They do not require a block device