linux-kernel - Re: [PATCH 14/34] sysfs, kernfs: prepare read path for kernfs

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Message-ID: <20131026113221.GB1792@Nokia-N900>
Date:	Sat, 26 Oct 2013 13:32:21 +0200
From:	Pavel Machek <pavel@....cz>
To:	Tejun Heo <tj@...nel.org>
Cc:	gregkh@...uxfoundation.org, kay@...y.org,
	linux-kernel@...r.kernel.org, ebiederm@...ssion.com,
	bhelgaas@...gle.com
Subject: Re: [PATCH 14/34] sysfs, kernfs: prepare read path for kernfs

Hi!

> We're in the process of separating out core sysfs functionality into
> kernfs which will deal with sysfs_dirents directly.  This patch
> rearranges read path so that the kernfs and sysfs parts are separate.

> +static int sysfs_kf_seq_show(struct seq_file *sf, void *v)
>  {
>  	struct sysfs_open_file *of = sf->private;
>  	struct kobject *kobj = of->sd->s_parent->priv;
> -	const struct sysfs_ops *ops;
> +	const struct sysfs_ops *ops = sysfs_file_ops(of->sd);
> +	ssize_t count = 0;
>  	char *buf;
> -	ssize_t count;
>  
>  	/* acquire buffer and ensure that it's >= PAGE_SIZE */
>  	count = seq_get_buf(sf, &buf);

Initing count to zero is superfluous here.

> +	/* the same behavior as single_open() */
> +	return NULL + !*ppos;
> +}

That's certainly interesting code.

						Pavel
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