[Bug 236405] [fuse] FUSE(4) does not send FUSE_FLUSH on close(2)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236405

            Bug ID: 236405
           Summary: [fuse] FUSE(4) does not send FUSE_FLUSH on close(2)
           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

The FUSE protocol requires the client to send a FUSE_FLUSH command on every
close(2).  The main documented purpose is for filesystems to return delayed
write errors during close (discussed in bug 236327), but a more important,
undocumented purpose is to allow filesystems to release file locks.  That
behavior has been part of the protocol since version 7.7.

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