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ublk_register_io_buf() performs an expensive atomic refcount increment, as well as a lot of pointer chasing to look up the struct request. Create a separate ublk_daemon_register_io_buf() for the daemon task to call. Initialize ublk_io's reference count to a large number, introduce a field task_registered_buffers to count the buffers registered on the daemon task, and atomically subtract the large number minus task_registered_buffers in ublk_commit_and_fetch(). Also obtain the struct request directly from ublk_io's req field instead of looking it up on the tagset. Signed-off-by: Caleb Sander Mateos <csander@purestorage.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250620151008.3976463-12-csander@purestorage.com Signed-off-by: Jens Axboe <axboe@kernel.dk>