linux-ext4 - Re: [PATCH 06/12] fs: use the super_block as holder when mounting file systems

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Message-ID: <20230805083617.GB29780@lst.de>
Date:   Sat, 5 Aug 2023 10:36:17 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jan Kara <jack@...e.cz>
Cc:     Christoph Hellwig <hch@....de>, Al Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        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 06/12] fs: use the super_block as holder when mounting
 file systems

On Thu, Aug 03, 2023 at 03:33:30PM +0200, Jan Kara wrote:
> As a side note, after this patch we can also remove bdev->bd_super and
> transition the two real users (mark_buffer_write_io_error() and two places
> in ocfs2) to use bd_holder. Ext4 also uses bd_super but there it is really
> pointless as we have the superblock directly available in that function
> anyway.

I actually have a series to kill bd_super, but it uses b_assoc_map
as the replacement, as nothing in buffer.c should poke into the holder
and the buffer_head codes uses b_assoc_map a lot anyway.  Let me rebase
it and send it out.