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

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Date:   Thu, 3 Aug 2023 15:33:30 +0200
From:   Jan Kara <jack@...e.cz>
To:     Christoph Hellwig <hch@....de>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        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 06/12] fs: use the super_block as holder when mounting
 file systems

On Thu 03-08-23 13:51:31, Jan Kara wrote:
> On Wed 02-08-23 17:41:25, Christoph Hellwig wrote:
> > The file system type is not a very useful holder as it doesn't allow us
> > to go back to the actual file system instance.  Pass the super_block instead
> > which is useful when passed back to the file system driver.
> > 
> > Signed-off-by: Christoph Hellwig <hch@....de>
> 
> Nice, this is what I also wanted to eventually do :). Feel free to add:
> 
> Reviewed-by: Jan Kara <jack@...e.cz>

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.

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