[PATCHv7 2/6] io_uring: add support for kernel registered bvecs

[Pavel Begunkov]

On 2/26/25 18:20, Keith Busch wrote:
> From: Keith Busch <kbusch at kernel.org>
> 
> Provide an interface for the kernel to leverage the existing
> pre-registered buffers that io_uring provides. User space can reference
> these later to achieve zero-copy IO.
> 
> User space must register an empty fixed buffer table with io_uring in
> order for the kernel to make use of it.

Can you also fail rw.c:loop_rw_iter()? Something like:

loop_rw_iter() {
	if ((req->flags & REQ_F_BUF_NODE) &&
	    req->buf_node->buf->release)
		return -EFAULT;
}

-- 
Pavel Begunkov