[Bug 236226] [FUSE]: cache negative lookups

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236226

            Bug ID: 236226
           Summary: [FUSE]: cache negative lookups
           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

FUSE protocol 7.4 added the ability to cache negative lookups, but fuse(4) is
currently ignoring them.  Here's the documentation from libfuse:

* added support for negative entry caching: on lowlevel API if
  fuse_entry_param::ino is set to zero in reply to a lookup request,
  the kernel will cache the dentry for the specified amount of time.

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