Method and apparatus for dynamically unloading file system...

Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique

Reexamination Certificate

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C711S133000

Reexamination Certificate

active

10461078

ABSTRACT:
The invention provides a system and method for dynamically unloading file system filters in a stacked-call-back model where filters are stacked one on top of the other to form a filter stack. A filter manager keeps track of the progress of each I/O operation and calls each filter in turn with the filter returning after it has completed processing the given operation. The filter manager dynamically unloads a filter (or an instance of a filter) that is positioned at any position in the filter stack in a reasonable amount of time while I/O operations are actively being processed. The filter/filter instance can be unloaded with outstanding I/O operations on the filter either hosted by the filter or pended by other filters. I/O operations are canceled, completed or drained in order to unload the filter or filter instance. A filter may veto the unloading of the filter.

REFERENCES:
patent: 2004/0250131 (2004-12-01), Swander et al.
Kevin Dowd et al., “High Performance Computing, Second Edition” Jul. 1998—Chapters 10 and 12.
U.S. Appl. No. 10/315,384, filed Dec. 9, 2002, Pudipeddi et al.
U.S. Appl. No. 10/461,755, filed Jun. 13, 2003, Pudipeddi et al.

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