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This unifies several times in theory indentical 50 lines of code. The filesystems have a new method: vop_cachedlookup, which is the meat of the lookup, and use vfs_cache_lookup() for their vop_lookup method. vfs_cache_lookup() will check the namecache and pass on to the vop_cachedlookup method in case of a miss. It's still the task of the individual filesystems to populate the namecache with cache_enter(). Filesystems that do not use the namecache will just provide the vop_lookup method as usual.
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