linux-kernel - Re: [PATCH V2] writeback: merge try_to_writeback_inodes_sb

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Date:   Mon, 9 Oct 2017 14:00:29 +0200
From:   Jan Kara <jack@...e.cz>
To:     Rakesh Pandit <rakesh@...era.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Jens Axboe <axboe@...nel.dk>, Jan Kara <jack@...e.cz>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] writeback: merge try_to_writeback_inodes_sb_nr() into
 caller

On Mon 09-10-17 13:34:41, Rakesh Pandit wrote:
> Since commit 925a6efb8ff0c ("Btrfs: stop using
> try_to_writeback_inodes_sb_nr to flush delalloc") this function hasn't
> been used outside so stop exporting it.
> 
> In addition we merge it into try_to_writeback_inodes_sb() which is the
> only caller.  Also change return type of try_to_writeback_inodes_sb to
> void as the only user ext4 doesn't care.
> 
> Signed-off-by: Rakesh Pandit <rakesh@...era.com>

Looks good. You can add:

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

								Honza

> ---
>  fs/fs-writeback.c         | 30 ++++++------------------------
>  include/linux/writeback.h |  4 +---
>  2 files changed, 7 insertions(+), 27 deletions(-)
> 
> V2: Merge into only caller, change return type and adjust docs a bit
> 
> diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
> index 9e24d60..08f5deb 100644
> --- a/fs/fs-writeback.c
> +++ b/fs/fs-writeback.c
> @@ -2376,37 +2376,19 @@ void writeback_inodes_sb(struct super_block *sb, enum wb_reason reason)
>  EXPORT_SYMBOL(writeback_inodes_sb);
>  
>  /**
> - * try_to_writeback_inodes_sb_nr - try to start writeback if none underway
> + * try_to_writeback_inodes_sb - try to start writeback if none underway
>   * @sb: the superblock
> - * @nr: the number of pages to write
> - * @reason: the reason of writeback
> + * @reason: reason why some writeback work was initiated
>   *
> - * Invoke writeback_inodes_sb_nr if no writeback is currently underway.
> - * Returns 1 if writeback was started, 0 if not.
> + * Invoke __writeback_inodes_sb_nr if no writeback is currently underway.
>   */
> -bool try_to_writeback_inodes_sb_nr(struct super_block *sb, unsigned long nr,
> -				   enum wb_reason reason)
> +void try_to_writeback_inodes_sb(struct super_block *sb, enum wb_reason reason)
>  {
>  	if (!down_read_trylock(&sb->s_umount))
> -		return false;
> +		return;
>  
> -	__writeback_inodes_sb_nr(sb, nr, reason, true);
> +	__writeback_inodes_sb_nr(sb, get_nr_dirty_pages(), reason, true);
>  	up_read(&sb->s_umount);
> -	return true;
> -}
> -EXPORT_SYMBOL(try_to_writeback_inodes_sb_nr);
> -
> -/**
> - * try_to_writeback_inodes_sb - try to start writeback if none underway
> - * @sb: the superblock
> - * @reason: reason why some writeback work was initiated
> - *
> - * Implement by try_to_writeback_inodes_sb_nr()
> - * Returns 1 if writeback was started, 0 if not.
> - */
> -bool try_to_writeback_inodes_sb(struct super_block *sb, enum wb_reason reason)
> -{
> -	return try_to_writeback_inodes_sb_nr(sb, get_nr_dirty_pages(), reason);
>  }
>  EXPORT_SYMBOL(try_to_writeback_inodes_sb);
>  
> diff --git a/include/linux/writeback.h b/include/linux/writeback.h
> index dd1d2c2..e15ec14 100644
> --- a/include/linux/writeback.h
> +++ b/include/linux/writeback.h
> @@ -163,9 +163,7 @@ struct bdi_writeback;
>  void writeback_inodes_sb(struct super_block *, enum wb_reason reason);
>  void writeback_inodes_sb_nr(struct super_block *, unsigned long nr,
>  							enum wb_reason reason);
> -bool try_to_writeback_inodes_sb(struct super_block *, enum wb_reason reason);
> -bool try_to_writeback_inodes_sb_nr(struct super_block *, unsigned long nr,
> -				   enum wb_reason reason);
> +void try_to_writeback_inodes_sb(struct super_block *sb, enum wb_reason reason);
>  void sync_inodes_sb(struct super_block *);
>  void wakeup_flusher_threads(enum wb_reason reason);
>  void wakeup_flusher_threads_bdi(struct backing_dev_info *bdi,
> -- 
> 2.5.5
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR