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

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Message-ID: <Zh_1TdrwJcBeALIG@casper.infradead.org>
Date: Wed, 17 Apr 2024 17:14:05 +0100
From: Matthew Wilcox <willy@...radead.org>
To: Kairui Song <kasong@...cent.com>
Cc: 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,
	Ryusuke Konishi <konishi.ryusuke@...il.com>,
	linux-nilfs@...r.kernel.org
Subject: Re: [PATCH 2/8] nilfs2: drop usage of page_index

On Thu, Apr 18, 2024 at 12:08:36AM +0800, Kairui Song wrote:
> +++ 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_page->index << (PAGE_SHIFT - bmap->b_inode->i_blkbits);

I'd prefer this were

	key = bh->b_folio->index << (PAGE_SHIFT - bmap->b_inode->i_blkbits);

(pages only have a ->index field for historical reasons; I'm trying to
get rid of it)