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The main umbrella structure is the hdb.
- hdb (persistent)
- HDB entries
- priority queue
- resource limits
The entries in the hdb are hdbent:
- hdbent - a single entry (persistent)
- object represented as vid, path
- uid
- priorty
- flags (c+, d+?)
- link to name context
Name contexts are used for renames:
- name context -- for directory expansion (persistent)
- uid
- priority
- flags (inuse? expanded? etc.)
- links to
- expanded children
- parent (back pointer to expander)
- HDB priority queue
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