Re: [Qemu-devel] [PATCH v5 00/12] Add support for io_uring

[Stefan Hajnoczi]

On Mon, Jun 10, 2019 at 07:18:53PM +0530, Aarushi Mehta wrote:
> This patch series adds support for the newly developed io_uring Linux AIO
> interface. Linux io_uring is faster than Linux's AIO asynchronous I/O code,
> offers efficient buffered asynchronous I/O support, the ability to do I/O
> without performing a system call via polled I/O, and other efficiency 
> enhancements.
> 
> Testing it requires a host kernel (5.1+) and the liburing library.
> Use the option -drive aio=io_uring to enable it.
> 
> v5:
> - Adds completion polling
> - Extends qemu-io
> - Adds qemu-iotest

Flush is not hooked up.  Please use the io_uring IOURING_OP_FSYNC that
you've already written and connect it to file-posix.c.

When doing this watch out for the qiov->size check during completion
processing.  Flush doesn't have a qiov so it may be NULL.

Stefan

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