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30 .\" @(#)abstract.ms 5.2 (Berkeley) 4/16/91
33 Toward a Compatible Filesystem Interface
36 Marshall Kirk McKusick
38 Computer Systems Research Group
39 Computer Science Division
40 Department of Electrical Engineering and Computer Science
41 University of California, Berkeley
42 Berkeley, California 94720
44 As network or remote filesystems have been implemented for
46 several stylized interfaces between the filesystem implementation
47 and the rest of the kernel have been developed.
48 Notable among these are Sun Microsystems' virtual filesystem interface
49 using vnodes, Digital Equipment's Generic File System architecture,
50 and AT&T's File System Switch.
51 Each design attempts to isolate filesystem-dependent details
52 below the generic interface and to provide a framework within which
53 new filesystems may be incorporated.
54 However, each of these interfaces is different from
55 and incompatible with the others.
56 Each of them addresses somewhat different design goals.
57 Each was based upon a different starting version of
59 targetted a different set of filesystems with varying characteristics,
60 and uses a different set of primitive operations provided by the filesystem.
61 The current study compares the various filesystem interfaces.
62 Criteria for comparison include generality, completeness, robustness,
63 efficiency and esthetics.
64 As a result of this comparison, a proposal for a new filesystem interface
65 is advanced that includes the best features of the existing implementations.
66 The proposal adopts the calling convention for name lookup introduced
68 A prototype implementation is described.
69 This proposal and the rationale underlying its development
70 have been presented to major software vendors
71 as an early step toward convergence upon a compatible filesystem interface.