linux-ext4 - Re: [RFCv3 6/7] iomap: Optimize iomap_read

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Message-ID: <ZipgXVyehTovrRmp@casper.infradead.org>
Date: Thu, 25 Apr 2024 14:53:33 +0100
From: Matthew Wilcox <willy@...radead.org>
To: "Ritesh Harjani (IBM)" <ritesh.list@...il.com>
Cc: linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	"Darrick J . Wong" <djwong@...nel.org>,
	Ojaswin Mujoo <ojaswin@...ux.ibm.com>, Jan Kara <jack@...e.cz>
Subject: Re: [RFCv3 6/7] iomap: Optimize iomap_read_folio

On Thu, Apr 25, 2024 at 06:58:50PM +0530, Ritesh Harjani (IBM) wrote:
> +static loff_t iomap_read_folio_iter(const struct iomap_iter *iter,
> +		struct iomap_readpage_ctx *ctx)
> +{
> +	struct folio *folio = ctx->cur_folio;
> +	size_t pos = offset_in_folio(folio, iter->pos);

"pos" is position in file.  You should call this 'offset'.

> +	loff_t length = min_t(loff_t, folio_size(folio) - pos,
> +			      iomap_length(iter));
> +	loff_t done, ret;
> +
> +	for (done = 0; done < length; done += ret) {
> +		ret = iomap_readpage_iter(iter, ctx, done);
> +		if (ret <= 0)
> +			return ret;
> +	}