linux-ext4 - Re: [PATCH 09/12] ext4: drop s_umount over opening the log device

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Message-ID: <20230803-unsterblich-hinbekommen-55b083eead3f@brauner>
Date:   Thu, 3 Aug 2023 20:16:41 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Al Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>,
        Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>, Theodore Ts'o <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>,
        Ryusuke Konishi <konishi.ryusuke@...il.com>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Jens Axboe <axboe@...nel.dk>, linux-btrfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-nilfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH 09/12] ext4: drop s_umount over opening the log device

On Wed, Aug 02, 2023 at 05:41:28PM +0200, Christoph Hellwig wrote:
> Just like get_tree_bdev needs to drop s_umount when opening the main
> device, we need to do the same for the ext4 log device to avoid a
> potential lock order reversal with s_unmount for the mark_dead path.
> 
> It might be preferable to just drop s_umount over ->fill_super entirely,
> but that will require a fairly massive audit first, so we'll do the easy
> version here first.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---

Looks good to me,
Reviewed-by: Christian Brauner <brauner@...nel.org>