io_sequence_defer 452 fs/io_uring.c if (req && !io_sequence_defer(ctx, req)) { io_sequence_defer 2068 fs/io_uring.c if (!io_sequence_defer(ctx, req) && list_empty(&ctx->defer_list)) io_sequence_defer 2076 fs/io_uring.c if (!io_sequence_defer(ctx, req) && list_empty(&ctx->defer_list)) {