cgroup.c

		return ERR_PTR(-EBADF);
	}

	return cgrp;
}
EXPORT_SYMBOL_GPL(cgroup_get_from_fd);

/*
 * sock->sk_cgrp_data handling.  For more info, see sock_cgroup_data
 * definition in cgroup-defs.h.
 */
#ifdef CONFIG_SOCK_CGROUP_DATA

#if defined(CONFIG_CGROUP_NET_PRIO) || defined(CONFIG_CGROUP_NET_CLASSID)

DEFINE_SPINLOCK(cgroup_sk_update_lock);
static bool cgroup_sk_alloc_disabled __read_mostly;

void cgroup_sk_alloc_disable(void)
{
	if (cgroup_sk_alloc_disabled)
		return;
	pr_info("cgroup: disabling cgroup2 socket matching due to net_prio or net_cls activation\n");
	cgroup_sk_alloc_disabled = true;
}

#else

#define cgroup_sk_alloc_disabled	false

#endif

void cgroup_sk_alloc(struct sock_cgroup_data *skcd)
{
	if (cgroup_sk_alloc_disabled)
		return;

	/* Socket clone path */
	if (skcd->val) {
		/*
		 * We might be cloning a socket which is left in an empty
		 * cgroup and the cgroup might have already been rmdir'd.
		 * Don't use cgroup_get_live().
		 */
		cgroup_get(sock_cgroup_ptr(skcd));
		return;
	}

	rcu_read_lock();

	while (true) {
		struct css_set *cset;

		cset = task_css_set(current);
		if (likely(cgroup_tryget(cset->dfl_cgrp))) {
			skcd->val = (unsigned long)cset->dfl_cgrp;
			break;
		}
		cpu_relax();
	}

	rcu_read_unlock();
}

void cgroup_sk_free(struct sock_cgroup_data *skcd)
{
	cgroup_put(sock_cgroup_ptr(skcd));
}

#endif	/* CONFIG_SOCK_CGROUP_DATA */

#ifdef CONFIG_CGROUP_BPF
int cgroup_bpf_update(struct cgroup *cgrp, struct bpf_prog *prog,
		      enum bpf_attach_type type, bool overridable)
{
	struct cgroup *parent = cgroup_parent(cgrp);
	int ret;

	mutex_lock(&cgroup_mutex);
	ret = __cgroup_bpf_update(cgrp, parent, prog, type, overridable);
	mutex_unlock(&cgroup_mutex);
	return ret;
}
#endif /* CONFIG_CGROUP_BPF */