NFSv4 file lock reporting interface request

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Hello.  I am with the institutional hosting service at NASA's Jet Propulsion Laboratory and we have been trying to find the answer to an apparently simple question.

We are running an NFSv4 server on Centos 7 and we need to get the server to tell us which files it thinks are locked by which clients.  This is because we have observed failure modes where something apparently has a lock (because attempting to lock the file again blocks) but we can't find a client that has the lock. Finding out what the server believes would be critical to troubleshooting this.

We tracked down Trond Myklebust and Neil Brown and conversation suggests that this is a function that is (a) not currently available and (b) reasonable to ask for.  So this is me suggesting that an interface be provided to have knfsd output its list of locked files and clients.

Regards,
Peter Scott
Office of the CIO
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