linux-kernel - Re: [PATCH 5/5] fs: remove the NULL get_block case in mpage

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Message-ID: <20220609172530.q7bzttn5v2orirre@quack3.lan>
Date:   Thu, 9 Jun 2022 19:25:30 +0200
From:   Jan Kara <jack@...e.cz>
To:     Christoph Hellwig <hch@....de>
Cc:     Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.com>,
        Dave Kleikamp <shaggy@...nel.org>, linux-ext4@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        jfs-discussion@...ts.sourceforge.net
Subject: Re: [PATCH 5/5] fs: remove the NULL get_block case in
 mpage_writepages

On Wed 08-06-22 17:04:51, Christoph Hellwig wrote:
> No one calls mpage_writepages with a NULL get_block paramter, so remove
> support for that case.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

What about ntfs_writepages()? That seems to call mpage_writepages() with
NULL get_block() in one case...

								Honza

> ---
>  fs/mpage.c | 22 ++++++----------------
>  1 file changed, 6 insertions(+), 16 deletions(-)
> 
> diff --git a/fs/mpage.c b/fs/mpage.c
> index a354ef2b4b4eb..e4cf881634a6a 100644
> --- a/fs/mpage.c
> +++ b/fs/mpage.c
> @@ -636,8 +636,6 @@ static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
>   * @mapping: address space structure to write
>   * @wbc: subtract the number of written pages from *@...->nr_to_write
>   * @get_block: the filesystem's block mapper function.
> - *             If this is NULL then use a_ops->writepage.  Otherwise, go
> - *             direct-to-BIO.
>   *
>   * This is a library function, which implements the writepages()
>   * address_space_operation.
> @@ -654,24 +652,16 @@ int
>  mpage_writepages(struct address_space *mapping,
>  		struct writeback_control *wbc, get_block_t get_block)
>  {
> +	struct mpage_data mpd = {
> +		.get_block	= get_block,
> +	};
>  	struct blk_plug plug;
>  	int ret;
>  
>  	blk_start_plug(&plug);
> -
> -	if (!get_block)
> -		ret = generic_writepages(mapping, wbc);
> -	else {
> -		struct mpage_data mpd = {
> -			.bio = NULL,
> -			.last_block_in_bio = 0,
> -			.get_block = get_block,
> -		};
> -
> -		ret = write_cache_pages(mapping, wbc, __mpage_writepage, &mpd);
> -		if (mpd.bio)
> -			mpage_bio_submit(mpd.bio);
> -	}
> +	ret = write_cache_pages(mapping, wbc, __mpage_writepage, &mpd);
> +	if (mpd.bio)
> +		mpage_bio_submit(mpd.bio);
>  	blk_finish_plug(&plug);
>  	return ret;
>  }
> -- 
> 2.30.2
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR