[PATCH v2] sunrpc: add netns inum and srcaddr to debugfs rpc_xprt info

[Jeff Layton]

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@xxxxxxxxxx>
---
This is more client-side code, so I figure this should go in via the NFS
client tree.
---
Changes in v2:
- Don't bother with NUL termination, just use a length specifier
- Link to v1: https://lore.kernel.org/r/20250122-nfs-6-14-v1-1-164b0b5aa330@xxxxxxxxxx
---
 net/sunrpc/debugfs.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/net/sunrpc/debugfs.c b/net/sunrpc/debugfs.c
index a176d5a0b0ee9a2c0ca1d1ed3131b67b782c3296..9498f385716d5eab1c5766a2a4ef5218155432e0 100644
--- a/net/sunrpc/debugfs.c
+++ b/net/sunrpc/debugfs.c
@@ -179,6 +179,18 @@ 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)
+			ret = sprintf(buf, "<closed>");
+		seq_printf(f, "saddr: %.*s\n", ret, buf);
+	}
 	return 0;
 }
 

---
base-commit: ffd294d346d185b70e28b1a28abe367bbfe53c04
change-id: 20250122-nfs-6-14-7f737deb6356

Best regards,
-- 
Jeff Layton <jlayton@xxxxxxxxxx>