Adding namecache entries outside of vfs_lookup and vn_open ?

[Alan Somers]

It looks like lookup and open are the only common vops that create new
namecache entries.  At least, those are the only ones that set
MAKEENTRY in the cn_flags field.  However, fuse(4)'s create-like
operations (FUSE_CREATE, FUSE_SYMLINK, etc) all return enough
information to create a namecache entry for the newly created file.
As-is, an operation like FUSE_CREATE will almost always be followed up
by a FUSE_LOOKUP, necessitating an extra round-trip to userland.

Would it be possible and wise to add these newly created entries to
the namecache automatically?

-Alan