linux-kernel - Re: [PATCH] Send quota messages via netlink

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Message-ID: <20070829100313.GA7814@duck.suse.cz>
Date:	Wed, 29 Aug 2007 12:03:13 +0200
From:	Jan Kara <jack@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Send quota messages via netlink

On Tue 28-08-07 21:51:28, Andrew Morton wrote:
> On Tue, 28 Aug 2007 16:13:18 +0200 Jan Kara <jack@...e.cz> wrote:
> 
> > +static void send_warning(const struct dquot *dquot, const char warntype)
> > +{
> > +	static unsigned long seq;
> > +	struct sk_buff *skb;
> > +	void *msg_head;
> > +	int ret;
> > +
> > +	skb = genlmsg_new(QUOTA_NL_MSG_SIZE, GFP_NOFS);
> > +	if (!skb) {
> > +		printk(KERN_ERR
> > +		  "VFS: Not enough memory to send quota warning.\n");
> > +		return;
> > +	}
> > +	msg_head = genlmsg_put(skb, 0, seq++, &quota_genl_family, 0, QUOTA_NL_C_WARNING);
> 
> The access to seq is racy, isn't it?
> 
> If so, that can be solved with a lock, or with atomic_add_return().
  You're right. I've made atomic_t from seq. Thanks for spotting this.

										Honza
-- 
Jan Kara <jack@...e.cz>
SuSE CR Labs
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