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Currently, when we process CQEs, we know which ublk_queue we are working on because we know which ring we are working on, and ublk_queues and rings are in 1:1 correspondence. However, as we decouple ublk_queues from ublk server threads, ublk_queues and rings will no longer be in 1:1 correspondence - each ublk server thread will have a ring, and each thread may issue commands against more than one ublk_queue. So in order to know which ublk_queue a CQE refers to, plumb that information in the associated SQE's user_data. Signed-off-by: Uday Shankar <ushankar@purestorage.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250529-ublk_task_per_io-v8-2-e9d3b119336a@purestorage.com Signed-off-by: Jens Axboe <axboe@kernel.dk>