Building a meta file system from file system cells
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United States of America Patent
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Aug 10, 2004
Grant Date -
Sep 26, 2002
app pub date -
Mar 20, 2001
filing date -
Mar 20, 2001
priority date (Note) -
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Abstract
File system cells are linked together to form a meta file system that appears to a user or application program to be a single file system. Each file system cell may have a conventional file system format, and can be indistinguishable from a conventional file system except for information, such as directory entry attributes, indicating one or more links to other file system cells. These external links may include direct links that are hidden from the user or application program and define a hierarchy of the meta file system cells, and indirect links that appear in the user-visible file system. The meta file system substantially reduces crash recovery time because each file system cell functions as a consistency unit that can be repaired only if needed. The meta file system also permits the file system cells to be accessed concurrently by multiple processors in a file server.
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