Bit-level indirection defragmentation
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United States of America Patent
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Apr 17, 2018
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app pub date -
Jul 28, 2016
filing date -
Jul 28, 2016
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Abstract
In general, techniques are described for logical defragmenting of a storage device. A controller of a storage device groups sequential logical block addresses of a logical span into a plurality of groups. Each group includes a same number of logical block addresses, and each logical block address references a physical location of a physical block on the storage device. For each group, the controller determines whether at least one logical block address references a physical location of a physical block that includes valid data. Responsive to the at least one logical block address referencing valid data, the controller stores a first value to a field of a bit-level indirection table. The bit-level indirection table includes a number of fields equal to a number of groups of sequential logical block addresses. Responsive none of the logical block addresses referencing valid data, the controller stores a second value to the field.
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