curl: convert readv to coroutines
This is pretty simple. The bottom half goes away because, unlike bdrv_aio_readv, coroutine-based read can return immediately without yielding. However, for simplicity I kept the former bottom half handler in a separate function. Reviewed-by: NJeff Cody <jcody@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Reviewed-by: NMax Reitz <mreitz@redhat.com> Message-id: 20170515100059.15795-7-pbonzini@redhat.com Signed-off-by: NJeff Cody <jcody@redhat.com>
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