linux-kernel - Re: [PATCH] ceph: redirty page before returning AOP_WRITEPAGE

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Date: Mon, 25 Mar 2024 09:28:39 +0800
From: Xiubo Li <xiubli@...hat.com>
To: NeilBrown <neilb@...e.de>, Ilya Dryomov <idryomov@...il.com>,
 Jeff Layton <jlayton@...nel.org>
Cc: ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ceph: redirty page before returning
 AOP_WRITEPAGE_ACTIVATE


On 3/25/24 06:21, NeilBrown wrote:
> The page has been marked clean before writepage is called.  If we don't
> redirty it before postponing the write, it might never get written.
>
> Fixes: 503d4fa6ee28 ("ceph: remove reliance on bdi congestion")
> Signed-off-by: NeilBrown <neilb@...e.de>
> ---
>   fs/ceph/addr.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
> index 1340d77124ae..ee9caf7916fb 100644
> --- a/fs/ceph/addr.c
> +++ b/fs/ceph/addr.c
> @@ -795,8 +795,10 @@ static int ceph_writepage(struct page *page, struct writeback_control *wbc)
>   	ihold(inode);
>   
>   	if (wbc->sync_mode == WB_SYNC_NONE &&
> -	    ceph_inode_to_fs_client(inode)->write_congested)
> +	    ceph_inode_to_fs_client(inode)->write_congested) {
> +		redirty_page_for_writepage(wbc, page);
>   		return AOP_WRITEPAGE_ACTIVATE;
> +	}
>   
>   	wait_on_page_fscache(page);
>   

Good catch!

Applied to the testing branch to run the tests.

Thanks NeilBrown

- Xiubo