Re: [Qemu-block] [RFC PATCH 4/8] file-posix: Implement bdrv_co_copy_range

[Stefan Hajnoczi]

On Thu, Mar 29, 2018 at 07:09:10PM +0800, Fam Zheng wrote:
> +static ssize_t handle_aiocb_copy_range(RawPosixAIOData *aiocb)
> +{
> +#ifndef HAS_COPY_FILE_RANGE
> +    return -ENOTSUP;
> +#else
> +    uint64_t bytes = aiocb->aio_nbytes;
> +    off_t in_off = aiocb->aio_offset;
> +    off_t out_off = aiocb->offset2;
> +
> +    while (bytes) {
> +        ssize_t ret = copy_file_range(aiocb->aio_fildes, &in_off,
> +                                      aiocb->fd2, &out_off,
> +                                      bytes, 0);
> +        if (ret < 0) {
> +            return -errno;
> +        }

EINTR should retry.

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