This patch enables read IO from backing device. For the feature,
it implements two IO read functions to transfer data from backing
storage.
One is asynchronous IO function and other is synchronous one.
A reason I need synchrnous IO is due to partial write which need to
complete read IO before
This patch enables read IO from backing device. For the feature,
it implements two IO read functions to transfer data from backing
storage.
One is asynchronous IO function and other is synchronous one.
A reason I need synchrnous IO is due to partial write which need to
complete read IO before
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