linux-kernel - Re: [PATCH 18/19] iomap: Convert iomap_writepages() to use for_each_writeback

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Date: Tue, 30 Jan 2024 11:03:07 +0100
From: Jan Kara <jack@...e.cz>
To: Christoph Hellwig <hch@....de>
Cc: linux-mm@...ck.org, Matthew Wilcox <willy@...radead.org>,
	Jan Kara <jack@...e.com>, David Howells <dhowells@...hat.com>,
	Brian Foster <bfoster@...hat.com>,
	Christian Brauner <brauner@...nel.org>,
	"Darrick J. Wong" <djwong@...nel.org>, linux-xfs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 18/19] iomap: Convert iomap_writepages() to use
 for_each_writeback_folio()

On Thu 25-01-24 09:57:57, Christoph Hellwig wrote:
> From: Matthew Wilcox <willy@...radead.org>
> 
> This removes one indirect function call per folio, and adds typesafety
> by not casting through a void pointer.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> Signed-off-by: Christoph Hellwig <hch@....de>

Looks good. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  fs/iomap/buffered-io.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
> index 093c4515b22a53..58b3661f5eac9e 100644
> --- a/fs/iomap/buffered-io.c
> +++ b/fs/iomap/buffered-io.c
> @@ -1887,9 +1887,8 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc,
>   * regular allocated space.
>   */
>  static int iomap_do_writepage(struct folio *folio,
> -		struct writeback_control *wbc, void *data)
> +		struct writeback_control *wbc, struct iomap_writepage_ctx *wpc)
>  {
> -	struct iomap_writepage_ctx *wpc = data;
>  	struct inode *inode = folio->mapping->host;
>  	u64 end_pos, isize;
>  
> @@ -1986,10 +1985,12 @@ iomap_writepages(struct address_space *mapping, struct writeback_control *wbc,
>  		struct iomap_writepage_ctx *wpc,
>  		const struct iomap_writeback_ops *ops)
>  {
> -	int			ret;
> +	struct folio *folio;
> +	int ret;
>  
>  	wpc->ops = ops;
> -	ret = write_cache_pages(mapping, wbc, iomap_do_writepage, wpc);
> +	for_each_writeback_folio(mapping, wbc, folio, ret)
> +		ret = iomap_do_writepage(folio, wbc, wpc);
>  	if (!wpc->ioend)
>  		return ret;
>  	return iomap_submit_ioend(wpc, wpc->ioend, ret);
> -- 
> 2.39.2
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR