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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: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20250618-reftrack-dbgfs-v15-8-24fc37ead144@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jeff Layton 2025-06-18 10:24:21 -04:00 committed by Jakub Kicinski
parent d04992dc86
commit 8f2079f8da
1 changed files with 29 additions and 1 deletions
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30
net/core/net_namespace.c
View File

@ -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)