Commit 8f2079f8 authored by Jeff Layton's avatar Jeff Layton Committed by Jakub Kicinski
Browse files

net: add symlinks to ref_tracker_dir for netns 



After assigning the inode number to the namespace, use it to create a
unique name for each netns refcount tracker with the ns.inum and
net_cookie values in it, and register a symlink to the debugfs file for
it.

init_net is registered before the ref_tracker dir is created, so add a
late_initcall() to register its files and symlinks.

Signed-off-by: default avatarJeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20250618-reftrack-dbgfs-v15-8-24fc37ead144@kernel.org


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent d04992dc

net/core/net_namespace.c

+29 −1
Original line number Diff line number Diff line
@@ -791,12 +791,40 @@ struct net *get_net_ns_by_pid(pid_t pid) 
}

EXPORT_SYMBOL_GPL(get_net_ns_by_pid);



#ifdef CONFIG_NET_NS_REFCNT_TRACKER

static void net_ns_net_debugfs(struct net *net)

{

	ref_tracker_dir_symlink(&net->refcnt_tracker, "netns-%llx-%u-refcnt",

				net->net_cookie, net->ns.inum);

	ref_tracker_dir_symlink(&net->notrefcnt_tracker, "netns-%llx-%u-notrefcnt",

				net->net_cookie, net->ns.inum);

}



static int __init init_net_debugfs(void)

{

	ref_tracker_dir_debugfs(&init_net.refcnt_tracker);

	ref_tracker_dir_debugfs(&init_net.notrefcnt_tracker);

	net_ns_net_debugfs(&init_net);

	return 0;

}

late_initcall(init_net_debugfs);

#else

static void net_ns_net_debugfs(struct net *net)

{

}

#endif



static __net_init int net_ns_net_init(struct net *net)

{

	int ret;



#ifdef CONFIG_NET_NS

	net->ns.ops = &netns_operations;

#endif

	return ns_alloc_inum(&net->ns);

	ret = ns_alloc_inum(&net->ns);

	if (!ret)

		net_ns_net_debugfs(net);

	return ret;

}



static __net_exit void net_ns_net_exit(struct net *net)