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File system meta-data.

To determine when main memory space needs to be freed, Hummingbird maintains counts of the amount of space used for storing the files and the file system data. To assist with determining which files and clusters to evict from main memory, Hummingbird maintains two LRU lists, one for files which have not yet been packed into clusters and another for clusters that are in memory.

Liddy Shriver 2001-05-01