linux-kernel - Re: [RFC PATCH 3/6] mm: Push readahead_control down into force_page_cache

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Date:   Wed, 2 Sep 2020 16:54:26 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     David Howells <dhowells@...hat.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 3/6] mm: Push readahead_control down into
 force_page_cache_readahead() [ver #2]

On Wed, Sep 02, 2020 at 04:44:38PM +0100, David Howells wrote:
> +++ b/mm/fadvise.c
> @@ -104,7 +104,10 @@ int generic_fadvise(struct file *file, loff_t offset, loff_t len, int advice)
>  		if (!nrpages)
>  			nrpages = ~0UL;
>  
> -		force_page_cache_readahead(mapping, file, start_index, nrpages);
> +		{
> +			DEFINE_READAHEAD(rac, file, mapping, start_index);
> +			force_page_cache_readahead(&rac, nrpages);
> +		}
>  		break;

This is kind of awkward.  How about this:

static void force_page_cache_readahead(struct address_space *mapping,
		struct file *file, pgoff_t index, unsigned long nr_to_read)
{
	DEFINE_READAHEAD(rac, file, mapping, index);
	force_page_cache_ra(&rac, nr_to_read);
}

in mm/internal.h for now (and it can migrate if it needs to be somewhere else)