linux-kernel - Re: f2fs: Add f2fs_balance

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Message-ID: <20140708075843.GA59558@jmac>
Date:	Tue, 8 Jul 2014 00:58:43 -0700
From:	Jaegeuk Kim <jaegeuk@...nel.org>
To:	Huang Ying <ying.huang@...el.com>
Cc:	Changman Lee <cm224.lee@...sung.com>,
	linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: f2fs: Add f2fs_balance_fs for direct IO

Hi Huang,

It occurs a merge conflict.
Please check the patch.

Anyway, IMO, it needs to place f2fs_balance_fs somewhere in get_data_block.

Thanks,

On Mon, Jul 07, 2014 at 01:46:28PM +0800, Huang Ying wrote:
> Otherwise, if a large amount of direct IO writes were done, the
> segment allocation may be failed because no enough segments are gced.
> 
> Signed-off-by: Huang, Ying <ying.huang@...el.com>
> ---
>  fs/f2fs/data.c |    6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -1038,6 +1038,7 @@ static ssize_t f2fs_direct_IO(int rw, st
>  {
>  	struct file *file = iocb->ki_filp;
>  	struct inode *inode = file->f_mapping->host;
> +	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
>  
>  	/* Let buffer I/O handle the inline data case. */
>  	if (f2fs_has_inline_data(inode))
> @@ -1046,8 +1047,11 @@ static ssize_t f2fs_direct_IO(int rw, st
>  	if (check_direct_IO(inode, rw, iter, offset))
>  		return 0;
>  
> +	if (rw == WRITE)
> +		f2fs_balance_fs(sbi);
> +
>  	/* clear fsync mark to recover these blocks */
> -	fsync_mark_clear(F2FS_SB(inode->i_sb), inode->i_ino);
> +	fsync_mark_clear(sbi, inode->i_ino);
>  
>  	return blockdev_direct_IO(rw, iocb, inode, iter, offset,
>  				  get_data_block);

-- 
Jaegeuk Kim
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