[Bug 260764] Feature request: Control over NFS bg timeout

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260764

            Bug ID: 260764
           Summary: Feature request: Control over NFS bg timeout
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: jwb@freebsd.org

Scenario:

HPC clusters have a head node responsible for managing resources on compute
nodes and often serving as a login node, from which jobs are submitted.

The head node is usually the first node booted since it runs services on which
other nodes depend, but also needs access to file servers, which are booted
later.  Mounting file servers with the "bg" option in fstab allows the head
node to complete a boot while other nodes are down, but only after a 60+ second
delay as it waits for the mount to time out.

I have worked around this by using "noauto" instead of "bg", and using a cron
job to mount file servers.  This avoids delays in booting, but is messy.  It
would be cleaner if there were a way to reduce the timeout for mounting with
"bg" to a few seconds when the server is not responding.

This would also be helpful in other situations where NFS servers need to be
cross mounted.

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