linux-kernel - Re: [RFC][PATCH 1/7] writeback: cleanup writeback_single

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Date:	Wed, 9 Sep 2009 17:45:17 +0200
From:	Jan Kara <jack@...e.cz>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Dave Chinner <david@...morbit.com>,
	Chris Mason <chris.mason@...cle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Christoph Hellwig <hch@...radead.org>, jack@...e.cz,
	Artem Bityutskiy <dedekind1@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org
Subject: Re: [RFC][PATCH 1/7] writeback: cleanup writeback_single_inode()

On Wed 09-09-09 22:51:42, Wu Fengguang wrote:
> Make the if-else straight in writeback_single_inode().
> No behavior change.
> 
> Cc: Michael Rubin <mrubin@...gle.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Signed-off-by: Fengguang Wu <wfg@...l.ustc.edu.cn>
  The patch looks good.
Acked-by: Jan Kara <jack@...e.cz>

> ---
>  fs/fs-writeback.c |   15 +++++++--------
>  1 file changed, 7 insertions(+), 8 deletions(-)
> 
> --- linux.orig/fs/fs-writeback.c	2009-09-09 21:40:41.000000000 +0800
> +++ linux/fs/fs-writeback.c	2009-09-09 21:41:14.000000000 +0800
> @@ -417,8 +417,13 @@ writeback_single_inode(struct inode *ino
>  	spin_lock(&inode_lock);
>  	inode->i_state &= ~I_SYNC;
>  	if (!(inode->i_state & (I_FREEING | I_CLEAR))) {
> -		if (!(inode->i_state & I_DIRTY) &&
> -		    mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
> +		if (inode->i_state & I_DIRTY) {
> +			/*
> +			 * Someone redirtied the inode while were writing back
> +			 * the pages.
> +			 */
> +			redirty_tail(inode);
> +		} else if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
>  			/*
>  			 * We didn't write back all the pages.  nfs_writepages()
>  			 * sometimes bales out without doing anything. Redirty
> @@ -462,12 +467,6 @@ writeback_single_inode(struct inode *ino
>  				inode->i_state |= I_DIRTY_PAGES;
>  				redirty_tail(inode);
>  			}
> -		} else if (inode->i_state & I_DIRTY) {
> -			/*
> -			 * Someone redirtied the inode while were writing back
> -			 * the pages.
> -			 */
> -			redirty_tail(inode);
>  		} else if (atomic_read(&inode->i_count)) {
>  			/*
>  			 * The inode is clean, inuse
> 
> -- 
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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