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Monterey, California
Apr. 11, 2005 to Apr. 14, 2005
ISBN: 0-7695-2318-8
pp: 253-260
Kristal T. Pollack , University of California, Santa Cruz
Scott A. Brandt , University of California, Santa Cruz
ABSTRACT
To determine whether a user can access a file in a hierarchical file system a traversal of the directory hierarchy is required in order to check access control for all the parent directories. This traversal can be especially expensive in a distributed system where the files may be on separate devices. We present two approaches for representing the complete access control for a file and its parent directories such that it can be stored locally with each file in order to avoid traversal. We use the well-known CNF and DNF (Conjunctive and Disjunctive Normal Form) formats to store permission and ownership information compactly for the entire path to a file. An examination of the structure of an existing large shared file system demonstrates the efficacy of our solution.
INDEX TERMS
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CITATION
Kristal T. Pollack, Scott A. Brandt, "Efficient Access Control for Distributed Hierarchical File Systems", MSST, 2005, Mass Storage Systems and Technologies, IEEE / NASA Goddard Conference on, Mass Storage Systems and Technologies, IEEE / NASA Goddard Conference on 2005, pp. 253-260, doi:10.1109/MSST.2005.11
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