International Business Machines Corporation

Peter A Fatzinger

Kevin Chou

Martin K Leung

Elpida Tzortzatos

Steven M Partlow

Harris M Morgenstern

David Hom

Michael Gary Spiegel

Karl David Schmitz

Sockallingam Radhakrishnan

Sockalingan Radhakrishnan

Embodiments are provided for implementing a transparent conversion of common virtual storage requests to storage with limited access. Embodiments include providing a storage manager configured to perform address translation for requests, providing a data address translation (DAT) structure configured to connect a higher-level DAT table to a lower-level DAT table, and creating the DAT structure based on a request from a process. Embodiments also include responsive to receiving a storage request, performing a DAT fault process based on validating user credentials associated with an entry of the higher-level DAT table corresponding to the storage request, and responsive to the validation, updating the higher-level DAT table entry to allow access to the restricted-use portion of the common virtual storage, and otherwise, returning a DAT fault for the higher-level DAT table entry.

Transparent conversion of common virtual storage

A program storage device and computer program product for performing merge transactions and non-failure rollback transactions between data structures without logging. The device and product comprise data structures objects (or consoles) comprising means for storing original attributes that define that object, means for storing apparent attributes merged into that object from the other object, means for storing a switch-to pointer, and means for storing a switch-chain pointer. The device and product may further comprise merging means for processing merge transactions, including means for switching the switch-to pointer of the second object to point to the first object, means for switching the switch-chain pointer of the first object to point to the second object to thereby form a switch chain, and means for logically ORing the apparent attributes of the first and second objects to thereby render the second object idle and permit the first object to control the attributes of the second object. The device and product may also include rollback means for rolling back a merge transaction, including means for removing the second object from the switch-chain, and means for logically ANDing the original attributes of the first object with the apparent attributes of the first object and storing the resulting group of attributes as new apparent attributes for the first object. Pluralities of objects may be merged into a single object as well.

Computer program product and program storage device for merging and

A system and method for performing merge transactions and non-failure rollback transactions between data structures without logging. The system comprises data structure objects (or consoles) comprising means for storing original attributes that define that object, means for storing apparent attributes merged into that object from the other object, means for storing a switch-to pointer, and means for storing a switch-chain pointer. The system may further comprise merging means for processing merge transactions, including means for switching the switch-to pointer of the second object to point to the first object, means for switching the switch-chain pointer of the first object to point to the second object to thereby form a switch chain, and means for logically ORing the apparent attributes of the first and second objects to thereby render the second object idle and permit the first object to control the attributes of the second object. The system may also include rollback means for rolling back a merge transaction, including means for removing the second object from the switch-chain, and means for logically ANDing the original attributes of the first object with the apparent attributes of the first object and storing the resulting group of attributes as new apparent attributes for the first object. Pluralities of objects may be merged into a single object as well.

System and method for merging and separating attributes of consoles

Growing community of inventors

Poughkeepsie, NY, United States of America

Peter A Fatzinger