linux-ext4 - Re: [PATCH 4/8] ext4: Save error info to sb through journal if available

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Date:   Thu, 17 Dec 2020 10:58:38 -0500
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Jan Kara <jack@...e.cz>
Cc:     linux-ext4@...r.kernel.org,
        harshad shirwadkar <harshadshirwadkar@...il.com>
Subject: Re: [PATCH 4/8] ext4: Save error info to sb through journal if
 available

On Wed, Dec 16, 2020 at 11:18:40AM +0100, Jan Kara wrote:
> If journalling is still working at the moment we get to writing error
> information to the superblock we cannot write directly to the superblock
> as such write could race with journalled update of the superblock and
> cause journal checksum failures, writing inconsistent information to the
> journal or other problems. We cannot journal the superblock directly
> from the error handling functions as we are running in uncertain context
> and could deadlock so just punt journalled superblock update to a
> workqueue.
> 
> Signed-off-by: Jan Kara <jack@...e.cz>

Thanks, applied.

					- Ted