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The file-posix block driver currently only sets up Linux AIO and io_uring in the BDS's AioContext. In the multi-queue block layer we must be able to submit I/O requests in AioContexts that do not have Linux AIO and io_uring set up yet since any thread can call into the block driver. Set up Linux AIO and io_uring for the current AioContext during request submission. We lose the ability to return an error from .bdrv_file_open() when Linux AIO and io_uring setup fails (e.g. due to resource limits). Instead the user only gets warnings and we fall back to aio=threads. This is still better than a fatal error after startup. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-ID: <20230914140101.1065008-2-stefanha@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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