linux-kernel - Re: [PATCH 2/3] Implement generic freeze feature

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Message-Id: <20081027231533.96c42a78.akpm@linux-foundation.org>
Date:	Mon, 27 Oct 2008 23:15:33 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Takashi Sato <t-sato@...jp.nec.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"dm-devel@...hat.com" <dm-devel@...hat.com>,
	"viro@...IV.linux.org.uk" <viro@...IV.linux.org.uk>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"xfs@....sgi.com" <xfs@....sgi.com>,
	"mtk.manpages@...glemail.com" <mtk.manpages@...glemail.com>,
	"axboe@...nel.dk" <axboe@...nel.dk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] Implement generic freeze feature

On Mon, 27 Oct 2008 21:58:54 +0900 Takashi Sato <t-sato@...jp.nec.com> wrote:

> -void thaw_bdev(struct block_device *bdev, struct super_block *sb)
> +int thaw_bdev(struct block_device *bdev, struct super_block *sb)
>  {
> +	int error = 0;
> +
> +	mutex_lock(&bdev->bd_fsfreeze_mutex);
> +	if (!bdev->bd_fsfreeze_count) {
> +		mutex_unlock(&bdev->bd_fsfreeze_mutex);
> +		return -EINVAL;

This would be a programming error, yes?

If so, a WARN_ON is more appropriate than a silent runtime error.

> +	}
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