linux-kernel - Re: [RFC PATCH 1/3] filemap: convert page_endio to folio

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Date:   Wed, 15 Mar 2023 15:51:37 +0100
From:   Hannes Reinecke <hare@...e.de>
To:     Pankaj Raghav <p.raghav@...sung.com>, hubcap@...ibond.com,
        senozhatsky@...omium.org, martin@...ibond.com, willy@...radead.org,
        minchan@...nel.org, viro@...iv.linux.org.uk, brauner@...nel.org,
        axboe@...nel.dk, akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        gost.dev@...sung.com, mcgrof@...nel.org, devel@...ts.orangefs.org
Subject: Re: [RFC PATCH 1/3] filemap: convert page_endio to folio_endio

On 3/15/23 13:32, Pankaj Raghav wrote:
> page_endio() already works on folios by converting a page in to a folio as
> the first step. Convert page_endio to folio_endio by taking a folio as the
> first parameter.
> 
> Instead of doing a page to folio conversion in the page_endio()
> function, the consumers of this API do this conversion and call the
> folio_endio() function in this patch.
> The following patches will convert the consumers of this API to use native
> folio functions to pass to folio_endio().
> 
> Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>
> ---
>   drivers/block/zram/zram_drv.c | 2 +-
>   fs/mpage.c                    | 2 +-
>   fs/orangefs/inode.c           | 2 +-
>   include/linux/pagemap.h       | 2 +-
>   mm/filemap.c                  | 8 +++-----
>   5 files changed, 7 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
> index aa490da3cef2..f441251c9138 100644
> --- a/drivers/block/zram/zram_drv.c
> +++ b/drivers/block/zram/zram_drv.c
> @@ -610,7 +610,7 @@ static void zram_page_end_io(struct bio *bio)
>   {
>   	struct page *page = bio_first_page_all(bio);
>   
> -	page_endio(page, op_is_write(bio_op(bio)),
> +	folio_endio(page_folio(page), op_is_write(bio_op(bio)),
>   			blk_status_to_errno(bio->bi_status));
>   	bio_put(bio);
>   }
> diff --git a/fs/mpage.c b/fs/mpage.c
> index 22b9de5ddd68..40e86e839e77 100644
> --- a/fs/mpage.c
> +++ b/fs/mpage.c
> @@ -50,7 +50,7 @@ static void mpage_end_io(struct bio *bio)
>   
>   	bio_for_each_segment_all(bv, bio, iter_all) {
>   		struct page *page = bv->bv_page;
> -		page_endio(page, bio_op(bio),
> +		folio_endio(page_folio(page), bio_op(bio),
>   			   blk_status_to_errno(bio->bi_status));
>   	}
>   
Can't this be converted to use 'bio_for_each_folio_all()' instead of
bio_for_each_segment_all()?

Cheers,

Hannes