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Stackable design of filing systems constructs sophisticated services from multiple, independently developed layers. This approach has been advocated to address development problems from code re-use, to extensibility, to version management. Individual layers of such a system often need to cache data to improve performance or provide desired functionality. When access to different layers is allowed, cache incoherencies can occur. Without a cache coherence solution, layer designers must eitherdoi:10.1145/224056.224067 dblp:conf/sosp/HeidemannP95 fatcat:5fzm5fwznfeehijqd6ospxnfbi