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由 Pavel Begunkov 提交于
No reason to mark a head of a link as for-async in io_req_defer_prep(). grab_env(), etc. That will be done further during submission if neccessary. Mark for_async=false saving extra grab_env() in many cases. Signed-off-by: NPavel Begunkov <asml.silence@gmail.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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