linux-kernel - Re: [PATCH v6 3/5] writeback, cgroup: split out the functional part of inode_switch_wbs_work

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Message-ID: <20210603085747.GF23647@quack2.suse.cz>
Date:   Thu, 3 Jun 2021 10:57:47 +0200
From:   Jan Kara <jack@...e.cz>
To:     Roman Gushchin <guro@...com>
Cc:     Jan Kara <jack@...e.cz>, Tejun Heo <tj@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Alexander Viro <viro@...iv.linux.org.uk>,
        Dennis Zhou <dennis@...nel.org>,
        Dave Chinner <dchinner@...hat.com>, cgroups@...r.kernel.org
Subject: Re: [PATCH v6 3/5] writeback, cgroup: split out the functional part
 of inode_switch_wbs_work_fn()

On Wed 02-06-21 17:55:15, Roman Gushchin wrote:
> Split out the functional part of the inode_switch_wbs_work_fn()
> function as inode_do switch_wbs() to reuse it later for switching
                      ^ underscore here

> inodes attached to dying cgwbs.
> 
> This commit doesn't bring any functional changes.
> 
> Signed-off-by: Roman Gushchin <guro@...com>

The patch looks good. Feel free to add:

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

								Honza

> ---
>  fs/fs-writeback.c | 19 +++++++++++--------
>  1 file changed, 11 insertions(+), 8 deletions(-)
> 
> diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
> index 09d2770449ef..212494d89cc2 100644
> --- a/fs/fs-writeback.c
> +++ b/fs/fs-writeback.c
> @@ -351,15 +351,12 @@ static void bdi_up_write_wb_switch_rwsem(struct backing_dev_info *bdi)
>  	up_write(&bdi->wb_switch_rwsem);
>  }
>  
> -static void inode_switch_wbs_work_fn(struct work_struct *work)
> +static void inode_do_switch_wbs(struct inode *inode,
> +				struct bdi_writeback *new_wb)
>  {
> -	struct inode_switch_wbs_context *isw =
> -		container_of(to_rcu_work(work), struct inode_switch_wbs_context, work);
> -	struct inode *inode = isw->inode;
>  	struct backing_dev_info *bdi = inode_to_bdi(inode);
>  	struct address_space *mapping = inode->i_mapping;
>  	struct bdi_writeback *old_wb = inode->i_wb;
> -	struct bdi_writeback *new_wb = isw->new_wb;
>  	XA_STATE(xas, &mapping->i_pages, 0);
>  	struct page *page;
>  	bool switched = false;
> @@ -470,11 +467,17 @@ static void inode_switch_wbs_work_fn(struct work_struct *work)
>  		wb_wakeup(new_wb);
>  		wb_put(old_wb);
>  	}
> -	wb_put(new_wb);
> +}
>  
> -	iput(inode);
> -	kfree(isw);
> +static void inode_switch_wbs_work_fn(struct work_struct *work)
> +{
> +	struct inode_switch_wbs_context *isw =
> +		container_of(to_rcu_work(work), struct inode_switch_wbs_context, work);
>  
> +	inode_do_switch_wbs(isw->inode, isw->new_wb);
> +	wb_put(isw->new_wb);
> +	iput(isw->inode);
> +	kfree(isw);
>  	atomic_dec(&isw_nr_in_flight);
>  }
>  
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR