[Bug 236530] [FUSE] most fuse syscalls should be interruptible

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236530

            Bug ID: 236530
           Summary: [FUSE] most fuse syscalls should be interruptible
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: asomers at FreeBSD.org

A FUSE filesystem daemon runs in userland and is allowed to do very slow stuff,
like access the network, for any operation.  Accordingly, any syscall that
waits on a response from the daemon should be interruptible, so any
unresponsive daemon won't cause a system hang.

The FUSE protocol includes a mechanism for interrupting operations.  It's
described in detail in doc/kernel.txt within the libfuse sources.  Our driver
currently doesn't implement it, but it should.

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