linux-kernel - Re: [PATCH v2 1/5] ext4: Fix reusing stale buffer heads from last failed mounting

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Date:   Tue, 14 Mar 2023 15:28:31 +0100
From:   Jan Kara <jack@...e.cz>
To:     Zhihao Cheng <chengzhihao1@...wei.com>
Cc:     Jan Kara <jack@...e.cz>, tytso@....edu, adilger.kernel@...ger.ca,
        jack@...e.com, tudor.ambarus@...aro.org,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        yi.zhang@...wei.com
Subject: Re: [PATCH v2 1/5] ext4: Fix reusing stale buffer heads from last
 failed mounting

On Tue 14-03-23 20:31:43, Zhihao Cheng wrote:
> > On Tue 14-03-23 20:01:46, Zhihao Cheng wrote:
> > > 在 2023/3/14 19:33, Jan Kara 写道:
> > > Hi Jan,
> > > 
> > > > 
> > > > > @@ -1271,14 +1277,8 @@ static void ext4_put_super(struct super_block *sb)
> > > > >    	sync_blockdev(sb->s_bdev);
> > > > >    	invalidate_bdev(sb->s_bdev);
> > > 
> > > For journal in the inode case, journal bhs come from block device, which
> > > means buffers will be dropped after this line 'invalidate_bdev(sb->s_bdev)'
> > > being executed.
> > 
> > Right, I've missed that. But then why do you remove the sbi->s_journal_bdev
> > != sb->s_bdev condition below?
> > 
> 
> I think 'sbi->s_journal_bdev != sb->s_bdev' always becomes true if
> sbi->s_journal_bdev exists.

OK, fair point. But please move this cleanup into a separate commit with
this justification. Thanks!

								Honza

-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR