linux-kernel - Re: [PATCH] writeback: make local functions as static

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Message-ID: <20130530092121.GB10177@quack.suse.cz>
Date:	Thu, 30 May 2013 11:21:21 +0200
From:	Jan Kara <jack@...e.cz>
To:	Haicheng Li <haicheng.li@...ux.intel.com>
Cc:	linux-fsdevel@...r.kernel.org,
	Fengguang Wu <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Haicheng Li <haicheng.lee@...il.com>
Subject: Re: [PATCH] writeback: make local functions as static

On Wed 29-05-13 21:49:38, Haicheng Li wrote:
> Functions not used globally should be static.
  I agree for wb_do_writeback(). You definitely shouldn't make
writeback_inodes_sb_nr() static, that it part of generic writeback API
(although it is currently unused, I agree). I'm somewhat undecided about
writeback_inodes_wb() - it may be handy for someone wanting to write out
everything on the bdi and it is a sane interface, OTOH it is unused as you
say and not exporting it wouldn't break consistency of the API...

								Honza

> 
> Signed-off-by: Haicheng Li <haicheng.li@...ux.intel.com>
> ---
>  fs/fs-writeback.c         |    7 +++----
>  include/linux/writeback.h |    5 -----
>  2 files changed, 3 insertions(+), 9 deletions(-)
> 
> diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
> index 3be5718..1d66062 100644
> --- a/fs/fs-writeback.c
> +++ b/fs/fs-writeback.c
> @@ -719,7 +719,7 @@ static long __writeback_inodes_wb(struct bdi_writeback *wb,
>  	return wrote;
>  }
>  
> -long writeback_inodes_wb(struct bdi_writeback *wb, long nr_pages,
> +static long writeback_inodes_wb(struct bdi_writeback *wb, long nr_pages,
>  				enum wb_reason reason)
>  {
>  	struct wb_writeback_work work = {
> @@ -959,7 +959,7 @@ static long wb_check_old_data_flush(struct bdi_writeback *wb)
>  /*
>   * Retrieve work items and do the writeback they describe
>   */
> -long wb_do_writeback(struct bdi_writeback *wb, int force_wait)
> +static long wb_do_writeback(struct bdi_writeback *wb, int force_wait)
>  {
>  	struct backing_dev_info *bdi = wb->bdi;
>  	struct wb_writeback_work *work;
> @@ -1269,7 +1269,7 @@ static void wait_sb_inodes(struct super_block *sb)
>   * on how many (if any) will be written, and this function does not wait
>   * for IO completion of submitted IO.
>   */
> -void writeback_inodes_sb_nr(struct super_block *sb,
> +static void writeback_inodes_sb_nr(struct super_block *sb,
>  			    unsigned long nr,
>  			    enum wb_reason reason)
>  {
> @@ -1289,7 +1289,6 @@ void writeback_inodes_sb_nr(struct super_block *sb,
>  	bdi_queue_work(sb->s_bdi, &work);
>  	wait_for_completion(&done);
>  }
> -EXPORT_SYMBOL(writeback_inodes_sb_nr);
>  
>  /**
>   * writeback_inodes_sb	-	writeback dirty inodes from given super_block
> diff --git a/include/linux/writeback.h b/include/linux/writeback.h
> index 579a500..ba3de47 100644
> --- a/include/linux/writeback.h
> +++ b/include/linux/writeback.h
> @@ -86,15 +86,10 @@ struct writeback_control {
>  struct bdi_writeback;
>  int inode_wait(void *);
>  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);
>  int try_to_writeback_inodes_sb(struct super_block *, enum wb_reason reason);
>  int try_to_writeback_inodes_sb_nr(struct super_block *, unsigned long nr,
>  				  enum wb_reason reason);
>  void sync_inodes_sb(struct super_block *);
> -long writeback_inodes_wb(struct bdi_writeback *wb, long nr_pages,
> -				enum wb_reason reason);
> -long wb_do_writeback(struct bdi_writeback *wb, int force_wait);
>  void wakeup_flusher_threads(long nr_pages, enum wb_reason reason);
>  void inode_wait_for_writeback(struct inode *inode);
>  
> -- 
> 1.7.9.5
> 
> --
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-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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