Re: [PATCH] sunrpc: add netns inum and srcaddr to debugfs rpc_xprt info

[Jeff Layton <jlayton@kernel.org>]

On Wed, 2025-01-22 at 09:59 -0500, Jeff Layton wrote:
> The output format should provide a value that matches the one in
> the /proc/<pid>/ns/net symlink. This makes it simpler to match the
> rpc_xprt and rpc_clnt to a particular container.
> 
> Also, when the xprt defines the get_srcaddr operation, use that to
> display the source address as well.
> 
> Signed-off-by: Jeff Layton <jlayton@kernel.org>
> ---
> This is more client-side code, so I figure this should go in via the NFS
> client tree, but if Chuck would rather pick it up, then that's fine too.
> ---
>  net/sunrpc/debugfs.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/net/sunrpc/debugfs.c b/net/sunrpc/debugfs.c
> index a176d5a0b0ee9a2c0ca1d1ed3131b67b782c3296..3b39493234d7079ff762a862bdd51725f36472dc 100644
> --- a/net/sunrpc/debugfs.c
> +++ b/net/sunrpc/debugfs.c
> @@ -179,6 +179,22 @@ xprt_info_show(struct seq_file *f, void *v)
>  	seq_printf(f, "addr:  %s\n", xprt->address_strings[RPC_DISPLAY_ADDR]);
>  	seq_printf(f, "port:  %s\n", xprt->address_strings[RPC_DISPLAY_PORT]);
>  	seq_printf(f, "state: 0x%lx\n", xprt->state);
> +	seq_printf(f, "netns: %u\n", xprt->xprt_net->ns.inum);
> +
> +	if (xprt->ops->get_srcaddr) {
> +		int ret, buflen;
> +		char buf[INET6_ADDRSTRLEN];
> +
> +		buflen = ARRAY_SIZE(buf);
> +		ret = xprt->ops->get_srcaddr(xprt, buf, buflen);
> +		if (ret > 0) {
> +			if (ret < buflen - 1)
> +				buf[ret] = '\0';
> +		} else {
> +			ret = sprintf(buf, "<closed>");
> +		}
> +		seq_printf(f, "saddr: %s\n", buf);

Now that I've sent this, I think we're better off using ret as a length
specifier for the %s argument. I'll send a v2 in a bit.

> +	}
>  	return 0;
>  }
>  
> 
> ---
> base-commit: ffd294d346d185b70e28b1a28abe367bbfe53c04
> change-id: 20250122-nfs-6-14-7f737deb6356
> 
> Best regards,

-- 
Jeff Layton <jlayton@kernel.org>