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

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Date: Wed, 24 Apr 2024 09:57:15 +0800
From: Kairui Song <ryncsn@...il.com>
To: Ryusuke Konishi <konishi.ryusuke@...il.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 2:51 AM Ryusuke Konishi
<konishi.ryusuke@...il.com> wrote:
>
> 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?

OK, will update this part.