Re: [PATCH 3/3] io_uring: Introduce getsockname io_uring cmd

[Jens Axboe <axboe@kernel.dk>]

On 10/24/25 9:49 AM, Gabriel Krisman Bertazi wrote:
> Introduce a socket-specific io_uring_cmd to support
> getsockname/getpeername via io_uring.  I made this an io_uring_cmd
> instead of a new operation to avoid polluting the command namespace with
> what is exclusively a socket operation.  In addition, since we don't
> need to conform to existing interfaces, this merges the
> getsockname/getpeername in a single operation, since the implementation
> is pretty much the same.
> 
> This has been frequently requested, for instance at [1] and more
> recently in the project Discord channel. The main use-case is to support
> fixed socket file descriptors.

Just two nits below, otherwise looks good!

> diff --git a/io_uring/cmd_net.c b/io_uring/cmd_net.c
> index 27a09aa4c9d0..092844358729 100644
> --- a/io_uring/cmd_net.c
> +++ b/io_uring/cmd_net.c
> @@ -132,6 +132,28 @@ static int io_uring_cmd_timestamp(struct socket *sock,
>  	return -EAGAIN;
>  }
>  
> +static int io_uring_cmd_getsockname(struct socket *sock,
> +				    struct io_uring_cmd *cmd,
> +				    unsigned int issue_flags)
> +{
> +	const struct io_uring_sqe *sqe = cmd->sqe;
> +

Random newline.

> +	struct sockaddr_storage address;
> +	struct sockaddr __user *uaddr;
> +	int __user *ulen;
> +	unsigned int peer;
> +
> +	uaddr = u64_to_user_ptr(READ_ONCE(sqe->addr));
> +	ulen = u64_to_user_ptr(sqe->addr3);
> +	peer = READ_ONCE(sqe->optlen);
> +
> +	if (sqe->ioprio || sqe->__pad1 || sqe->len || sqe->rw_flags)
> +		return -EINVAL;

Most/all prep handlers tend to check these first, then proceed with
setting up if not set. Would probably make sense to mirror that here
too.

-- 
Jens Axboe