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Date: Tue, 21 Jul 2009 17:55:36 -0400
From: Christoph Hellwig <hch@infradead.org>
To: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
       Heiko Carstens <heiko.carstens@de.ibm.com>,
       linux-kernel@vger.kernel.org,
       Hans-Joachim Picht <hans@linux.vnet.ibm.com>,
       pm list <linux-pm@lists.linux-foundation.org>,
       Arnd Schneider <arnd@de.ibm.com>, linux-fsdevel@vger.kernel.org
Subject: Re: PM/hibernate swapfile regression
Message-ID: <20090721215536.GA9502@infradead.org>
References: <20090714135453.GA26976@osiris.boeblingen.de.ibm.com> <200907141821.06101.rjw@sisk.pl> <4A6077DE.6060202@tuffmail.co.uk> <20090720132456.GA29023@osiris.boeblingen.de.ibm.com> <4A659D75.3050004@tuffmail.co.uk>
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On Tue, Jul 21, 2009 at 11:50:29AM +0100, Alan Jenkins wrote:
> +struct block_device *bdcopy(struct block_device *bdev)
> +{
> +	atomic_inc(&bdev->bd_inode->i_count);
> +	return bdev;
> +}
> +
> +EXPORT_SYMBOL(bdcopy);

The function name doesn't make any sense.  You don't copy anything
here, but you grab a reference to it.  A better name would be bdgrab,
mirroing the names of functions like igrab.  A kerneldoc comment
documenting it would also be very helpful.

Why do you export it?  The swapfile code is not actually modular.