[Bug 234581] [fusefs] no VOP_ADVLOCK support

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234581

            Bug ID: 234581
           Summary: [fusefs] no VOP_ADVLOCK support
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: asomers at FreeBSD.org

fusefs(4) does not implement VOP_ADVLOCK(9).  As a result, the kernel's default
implementation (vop_stdadvlock) is used.  That's fine for local filesystems,
but not for networked filesystems.  Networked filesystems could end up
concurrently accessing files that are apparently locked, if the accesses come
from different clients.  This limitation isn't documented in mount_fusefs(8),
or anywhere else that I can find.

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