Tracking compressed fragments for efficient free space management
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United States of America Patent
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Jan 30, 2018
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app pub date -
Mar 31, 2016
filing date -
Mar 31, 2016
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Abstract
A technique for managing storage space in a file system applies reference weights to compressed storage extents stored in multi-block segments. Each time a reference weight for a compressed storage extent in a segment changes to a value that indicates that the storage extent is no longer in use, a file system manager increments a freed-fragment counter provided for a range of the file system that includes the segment. The file system manager then determines whether to scavenge for free space in that range of the file system based at least in part on a count of the free-fragment counter.
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