linux-kernel - Re: [PATCH 1/4] CacheFiles: Use the ->write() file op rather than a special kernel aop

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Date:	Fri, 3 Apr 2009 09:49:27 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	David Howells <dhowells@...hat.com>
Cc:	nickpiggin@...oo.com.au, hch@...radead.org, nfsv4@...ux-nfs.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 1/4] CacheFiles: Use the ->write() file op rather than
	a special kernel aop

On Fri, Apr 03, 2009 at 10:41:38AM +0100, David Howells wrote:
> +			if (!aops->bmap)
>  				goto check_error;

What are you doing using bmap?  You really shouldn't call into it from
anywhere but FIBMAP.  Yes, swap currently does but it's a major pain
in the neck and Peter has been working on a proper interface for swap
for a while.

> +	if (IS_ERR(file)) {
> +		ret = PTR_ERR(file);

		goto out_something;

> +	} else {
> +		ret = -EIO;
> +		if (file->f_op->write) {

	if (!file->f_op->write)
		goto out_fput;

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