block: Make blk_co_preadv/pwritev() public
Also add trace points now that the function can be directly called. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NAlberto Garcia <berto@igalia.com>
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