System and method for filtering information in a data storage system
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United States of America Patent
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Oct 5, 2010
Grant Date -
N/A
app pub date -
Apr 23, 2007
filing date -
Apr 23, 2007
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Abstract
A storage system filter provides protocol aware filter operations that avoid I/O blocking or calling thread holding. A filter framework includes a filter controller that handles request and response calls to filters that are registered with the filter framework. Filters may be loaded and unloaded in a consistent state, and the filter framework provides services for the filters for common functions. Filters may operate in a user mode or a kernel mode and may be invoked in a synchronous, an asynchronous, or an asynchronous release mode. Filter registration may include registration for I/O resources, and may include tagging of I/O requests and responses to contribute to preventing conflicts.
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