Method for out of user space block mode I/O directly between an application instance and an I/O adapter
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United States of America Patent
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Mar 10, 2009
Grant Date -
Nov 23, 2006
app pub date -
May 23, 2005
filing date -
May 23, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a method that enables application instances to pass block mode storage requests directly to a physical I/O adapter without run-time involvement from the local operating system or hypervisor. Specifically, a mechanism for providing and using a linear block address (LBA) translation protection table (TPT) to control out of user space I/O operations is provided. In one aspect of the present invention, the LBATPT includes an adapter protection table that has entries for each portion of a storage device. Entries include access control values which identify whether the entry is valid and what access type operations may be performed on a corresponding portion of a storage device. I/O requests may be checked against these access control values to determine if an application instance that submitted the I/O requests may access the LBAs identified in the I/O requests in the manner requested.
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