linux-ext4 - Re: [RFC v3 5/7] iomap: Get page in page

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Message-ID: <Y5ydHlw4orl/gP3a@casper.infradead.org>
Date:   Fri, 16 Dec 2022 16:30:22 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Andreas Gruenbacher <agruenba@...hat.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        "Darrick J . Wong" <djwong@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, cluster-devel@...hat.com
Subject: Re: [RFC v3 5/7] iomap: Get page in page_prepare handler

On Fri, Dec 16, 2022 at 04:06:24PM +0100, Andreas Gruenbacher wrote:
> +	if (page_ops && page_ops->page_prepare)
> +		folio = page_ops->page_prepare(iter, pos, len);
> +	else
> +		folio = iomap_folio_prepare(iter, pos);
> +	if (IS_ERR_OR_NULL(folio)) {
> +		if (!folio)
> +			return (iter->flags & IOMAP_NOWAIT) ? -EAGAIN : -ENOMEM;
> +		return PTR_ERR(folio);

Wouldn't it be cleaner if iomap_folio_prepare() always
returned an ERR_PTR on failure?