This is actually the HDFS backend - but, logically, it works the same way as setfsuid. The HDFS client is setup to be able to impersonate any HDFS user.
Honestly, I don't want to support POSC since, as you point out, it really isn't plausible to "do it right" in this configuration.
Rather than trying to fix something that is fundamentally unfixable, is it possible to return an error or otherwise disable POSC? For me, the bigger problem is someone who starts a POSC transfer can cause my server to be unable to restart.
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