Data processing: database and file management or data structures – Database design – Data structure types
Reexamination Certificate
2005-09-01
2009-02-24
Mahmoudi, Tony (Department: 2169)
Data processing: database and file management or data structures
Database design
Data structure types
C707S793000, C714S002000
Reexamination Certificate
active
07496609
ABSTRACT:
File system metadata regarding states of a file system affected by transactions is tracked consistently even in the face of dirty shutdowns which might cause rollbacks in transactions which have already been reflected in the metadata. In order to only request time- and resource-heavy rebuilding of metadata for metadata which may have been affected by rollbacks, reliability information is tracked regarding metadata items. When a metadata item is affected by a transaction which may not complete properly in the case of a problematic shutdown or other event, that metadata item's reliability information indicates that it may not be reliable in case of such a problematic (“dirty” or “abnormal”) event. In addition to flag information indicating unreliability, timestamp information tracking a time of the command which has made a metadata item unreliable is also maintained. This timestamp information can then be used, along with information regarding a period after which the transaction will no longer cause a problem in the case of a problematic event, in order to reset the reliability information to indicate that the metadata item is now reliable even in the face of a problematic event.
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Christiansen Neal R.
Havewala Sarosh Cyrus
Pudipeddi Ravisankar
Thind Ravinder S.
Bétit Jacob F
Mahmoudi Tony
Microsoft Corporation
Woodcock & Washburn LLP
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