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由 Alex Elder 提交于
There are several Boolean values we'll be maintaining for image requests. Switch from the single write_request field to a general-purpose flags field, and use one if its bits to represent the direction of I/O for the image request. Define helper functions for setting and testing that flag. Signed-off-by: NAlex Elder <elder@inktank.com> Reviewed-by: NJosh Durgin <josh.durgin@inktank.com>
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