[Bug 236236] [FUSE] support FUSE_MKNOD

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236236

            Bug ID: 236236
           Summary: [FUSE] support FUSE_MKNOD
           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

Nascent FUSE_MKNOD support was removed in r239925 because of a bug in the fuse
fifo code.  But FUSE_MKNOD is important for more than just fifos.  We should
reenable support for the following reasons:

* To create chr device nodes, especially for preparing bootable media
* To create blk device nodes, especially for preparing bootable Linux media or
  for copying bootable Linux media.
* As a fallback for fuse filesystems that don't support FUSE_CREATE.  The FUSE
  protocol requires the kernel to fall back to FUSE_MKNOD/FUSE_OPEN if a 
  filesystem returns ENOSYS for FUSE_CREATE.
* Hey, fifos are useful too, right?

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