Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Tue, 18 Feb 2020 18:51:54 -0800
From:   Jaegeuk Kim <jaegeuk@kernel.org>
To:     Chao Yu <yuchao0@huawei.com>
Cc:     linux-f2fs-devel@lists.sourceforge.net,
        linux-kernel@vger.kernel.org, chao@kernel.org
Subject: Re: [PATCH 3/3] f2fs: avoid unneeded barrier in do_checkpoint()
Message-ID: <20200219025154.GB96609@google.com>
References: <20200218102136.32150-1-yuchao0@huawei.com>
 <20200218102136.32150-3-yuchao0@huawei.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20200218102136.32150-3-yuchao0@huawei.com>
User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 02/18, Chao Yu wrote:
> We don't need to wait all dirty page submitting IO twice,
> remove unneeded wait step.

What happens if checkpoint and other meta writs are reordered?

> 
> Signed-off-by: Chao Yu <yuchao0@huawei.com>
> ---
>  fs/f2fs/checkpoint.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> index 751815cb4c2b..9c88fb3d255a 100644
> --- a/fs/f2fs/checkpoint.c
> +++ b/fs/f2fs/checkpoint.c
> @@ -1384,8 +1384,6 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
>  
>  	/* Flush all the NAT/SIT pages */
>  	f2fs_sync_meta_pages(sbi, META, LONG_MAX, FS_CP_META_IO);
> -	/* Wait for all dirty meta pages to be submitted for IO */
> -	f2fs_wait_on_all_pages(sbi, F2FS_DIRTY_META);
>  
>  	/*
>  	 * modify checkpoint
> -- 
> 2.18.0.rc1