linux-kernel - Re: [PATCH v2 2/8] nilfs2: drop usage of page

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Date: Wed, 24 Apr 2024 03:48:03 +0900
From: Ryusuke Konishi <konishi.ryusuke@...il.com>
To: Kairui Song <kasong@...cent.com>
Cc: Matthew Wilcox <willy@...radead.org>, linux-mm@...ck.org, 
	Andrew Morton <akpm@...ux-foundation.org>, "Huang, Ying" <ying.huang@...el.com>, 
	Chris Li <chrisl@...nel.org>, Barry Song <v-songbaohua@...o.com>, 
	Ryan Roberts <ryan.roberts@....com>, Neil Brown <neilb@...e.de>, Minchan Kim <minchan@...nel.org>, 
	Hugh Dickins <hughd@...gle.com>, David Hildenbrand <david@...hat.com>, Yosry Ahmed <yosryahmed@...gle.com>, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-nilfs@...r.kernel.org
Subject: Re: [PATCH v2 2/8] nilfs2: drop usage of page_index

On Wed, Apr 24, 2024 at 2:04 AM Kairui Song wrote:
>
> From: Kairui Song <kasong@...cent.com>
>
> page_index is only for mixed usage of page cache and swap cache, for
> pure page cache usage, the caller can just use page->index instead.
>
> It can't be a swap cache page here (being part of buffer head),
> so just drop it, also convert it to use folio.
>
> Signed-off-by: Kairui Song <kasong@...cent.com>
> Cc: Ryusuke Konishi <konishi.ryusuke@...il.com>
> Cc: linux-nilfs@...r.kernel.org
> ---
>  fs/nilfs2/bmap.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/fs/nilfs2/bmap.c b/fs/nilfs2/bmap.c
> index 383f0afa2cea..9f561afe864f 100644
> --- a/fs/nilfs2/bmap.c
> +++ b/fs/nilfs2/bmap.c
> @@ -453,8 +453,7 @@ __u64 nilfs_bmap_data_get_key(const struct nilfs_bmap *bmap,
>         struct buffer_head *pbh;
>         __u64 key;
>
> -       key = page_index(bh->b_page) << (PAGE_SHIFT -
> -                                        bmap->b_inode->i_blkbits);
> +       key = bh->b_folio->index << (PAGE_SHIFT - bmap->b_inode->i_blkbits);
>         for (pbh = page_buffers(bh->b_page); pbh != bh; pbh = pbh->b_this_page)
>                 key++;

This conversion mixes the use of page and folio within the function.
Would you like to take the opportunity to convert
"page_buffers(bh->b_page)" to "folio_buffers(bh->b_folio)" as well?

Thanks,
Ryusuke Konishi