linux-kernel - Re: [PATCH 3/9] [RFC] Add a back-pointer from struct cg_cgroup

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Message-ID: <4A4DAE21.4000806@cn.fujitsu.com>
Date:	Fri, 03 Jul 2009 15:07:13 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Paul Menage <menage@...gle.com>
CC:	balbir@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, containers@...ts.linux-foundation.org,
	kamezawa.hiroyu@...fujitsu.com
Subject: Re: [PATCH 3/9] [RFC] Add a back-pointer from struct cg_cgroup_link
 to	struct cgroup

> +static int current_css_set_cg_links_read(struct cgroup *cont,
> +					 struct cftype *cft,
> +					 struct seq_file *seq)
> +{
> +	struct cg_cgroup_link *link, *saved_link;
> +	struct css_set *cg;

call for a newline

> +	write_lock_irq(&css_set_lock);

can be read_lock(&css_set_lock);

> +	task_lock(current);
> +	cg = current->cgroups;
> +	list_for_each_entry_safe(link, saved_link, &cg->cg_links,
> +				 cg_link_list) {
> +		struct cgroup *c = link->cgrp;
> +		const char *name;

call for a newline

> +		rcu_read_lock();
> +		if (c->dentry)
> +			name = c->dentry->d_name.name;
> +		else
> +			name = "?";
> +		seq_printf(seq, "Root %lu group %s\n",
> +			   c->root->subsys_bits, name);
> +		rcu_read_unlock();
> +	}
> +	task_unlock(current);
> +	write_unlock_irq(&css_set_lock);
> +	return 0;
> +}
> +
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