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Abstract

A method, program, and system provide flexibility when a PFS requests a memory object reference from a File Server's Pager so that it can map the object in memory. The PFS supplies a reference in return that allows the pager to obtain a mapping of a data region within that memory object, the mapping being a layout of a region in that memory object. The method divides functions performed by a general purpose pager into function-subsets and associates the function-subsets with a set of flags passed in on an original memory object reference request. The method then integrates the functions required by the pager for that specific memory object to become part of the object's pager attributes and links the set of flags to a set of PFS call-back functions that represent customized functions that the PFS selectively replaces. In this manner, the PFS can dynamically override a sequence of base methods used to access data on a memory object by memory object basis.

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