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The new_ prefix in Rust conventionally denotes constructors that return Self (e.g. Vec::new(), File::new()). AsyncDiskFile::new_async_io does not return Self. It is a factory method that constructs and returns a Box<dyn AsyncIo> worker bound to the disk file descriptor and metadata. The create_ prefix communicates this: the caller receives a freshly constructed object of a different type. This rename touches every format backend in block plus two external callers in virtio-devices and performance-metrics. Every change is a mechanical s/new_async_io/create_async_io/ substitution. No functional change. Ref: #7877 (task 3.2.8) Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>