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A Fast File System for UNIX*
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Revised July 27, 1983
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Marshall Kirk McKusick, William N. Joy\(dg,
Samuel J. Leffler\(dd, Robert S. Fabry
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Computer Systems Research Group
Computer Science Division
Department of Electrical Engineering and Computer Science
University of California, Berkeley
Berkeley, CA  94720
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* UNIX is a trademark of Bell Laboratories.
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\(dgWilliam N. Joy is currently employed by:
Sun Microsystems, Inc, 2550 Garcia Avenue, Mountain View, CA 94043
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\(ddSamuel J. Leffler is currently employed by:
Lucasfilm Ltd., PO Box 2009, San Rafael, CA 94912
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This work was done under grants from
the National Science Foundation under grant MCS80-05144,
and the Defense Advance Research Projects Agency (DoD) under
Arpa Order No. 4031 monitored by Naval Electronic System Command under
Contract No. N00039-82-C-0235.
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A reimplementation of the UNIX file system is described.
The reimplementation provides substantially higher throughput
rates by using more flexible allocation policies,
that allow better locality of reference and that can
be adapted to a wide range of peripheral and processor characteristics.
The new file system clusters data that is sequentially accessed
and provides two block sizes to allow fast access for large files
while not wasting large amounts of space for small files.
File access rates of up to ten times faster than the traditional
UNIX file system are experienced.
Long needed enhancements to the user interface are discussed.
These include a mechanism to lock files, 
extensions of the name space across file systems,
the ability to use arbitrary length file names,
and provisions for efficient administrative control of resource usage.
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.B "TABLE OF CONTENTS"
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.B "1.  Introduction"
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.B "2.  Old file system
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.B "3.  New file system organization
\0.1.    Optimizing storage utilization
\0.2.    File system parameterization
\0.3.    Layout policies
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.B "4.  Performance
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.B "5.  File system functional enhancements
\0.1.     Long file names
\0.2.     File locking
\0.3.     Symbolic links
\0.4.     Rename
\0.5.     Quotas
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.B "6.  Software engineering
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.B References
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