Efficient and Consistent Para-Virtual I/O System
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United States of America Patent
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Apr 15, 2016
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Sep 16, 2014
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Abstract
Embodiments of the invention relate to a para-virtual I/O system. A state of a filesystem associated with a para-virtual I/O system is updated, which includes performing semantic journaling in support of the update. The semantic journaling includes writing one or more data blocks and logging metadata updates to a journal. A cache flush request is received and classified based on semantic information of the system. The classification provides an order of commands for processing the received request. The classification is converted into an order of committed writes, and the order of committed writes is processed. The processing includes enforcing the order of committed writes to provide a consistent virtual disk image.
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