linux-ext4 - Re: [PATCH v2 08/12] fs: drop redundant check from __writeback_single

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Date:   Mon, 11 Jan 2021 16:00:05 +0100
From:   Jan Kara <jack@...e.cz>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     linux-fsdevel@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        Theodore Ts'o <tytso@....edu>, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2 08/12] fs: drop redundant check from
 __writeback_single_inode()

On Fri 08-01-21 23:58:59, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@...gle.com>
> 
> wbc->for_sync implies wbc->sync_mode == WB_SYNC_ALL, so there's no need
> to check for both.  Just check for WB_SYNC_ALL.
> 
> Signed-off-by: Eric Biggers <ebiggers@...gle.com>

Looks good to me. Feel free to add:

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

								Honza

> ---
>  fs/fs-writeback.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
> index 80ee9816d9df5..cee1df6e3bd43 100644
> --- a/fs/fs-writeback.c
> +++ b/fs/fs-writeback.c
> @@ -1479,7 +1479,7 @@ __writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
>  	 * change I_DIRTY_TIME into I_DIRTY_SYNC.
>  	 */
>  	if ((inode->i_state & I_DIRTY_TIME) &&
> -	    (wbc->sync_mode == WB_SYNC_ALL || wbc->for_sync ||
> +	    (wbc->sync_mode == WB_SYNC_ALL ||
>  	     time_after(jiffies, inode->dirtied_time_when +
>  			dirtytime_expire_interval * HZ))) {
>  		trace_writeback_lazytime(inode);
> -- 
> 2.30.0
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR