FREE SPACE DEFRAGMENTION IN EXTENT BASED FILE SYSTEM
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United States of America Patent
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Issued Date -
Jun 23, 2011
app pub date -
Dec 23, 2009
filing date -
Dec 23, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Example apparatus, methods, data structures, and computers defragment unallocated space in a storage associated with an extent based file system. One example method locates a first unallocated area having a desired size and a desired location to receive an extent from a first end of an allocated area in the storage. The example method then swaps the extent from the first end of the allocated area with the first unallocated area. The example method also locates a second unallocated area having a desired size and a desired location to receive an extent from a second opposite end of the allocated area in the storage. The example method then swaps the extent from the second end of the allocated area with the second unallocated area. The example method may continue to swap until no more suitable unallocated regions are available to receive an extent sliced off an allocated area.
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