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block: add aio_flush operation
Instead stalling the VCPU while serving a cache flush try to do itasynchronously. Use our good old helper thread pool to issue anasynchronous fdatasync for raw-posix. Note that while Linux AIOimplements a fdatasync operation it is not useful for us because...
raw-posix: refactor AIO support
Currently the raw-posix.c code contains a lot of knowledge about theasynchronous I/O scheme that is mostly implemented in posix-aio-compat.c.All this code does not really belong here and is getting a bit in theway of implementing native AIO on Linux....
raw-posix: add Linux native AIO support
Now that do have a nicer interface to work against we can add Linux nativeAIO support. It's an extremly thing layer just setting up an iocb forthe io_submit system call in the submission path, and registering an...