linux-ext4 - Re: [PATCH] fs: i_version mntopt gets visible through /proc/mounts

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Date:   Fri, 19 Jun 2020 06:17:13 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Dave Chinner <david@...morbit.com>
Cc:     Masayoshi Mizuma <msys.mizuma@...il.com>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Eric Sandeen <sandeen@...deen.net>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Christoph Hellwig <hch@...radead.org>,
        Theodore Ts'o <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Masayoshi Mizuma <m.mizuma@...fujitsu.com>,
        linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-xfs <linux-xfs@...r.kernel.org>
Subject: Re: [PATCH] fs: i_version mntopt gets visible through /proc/mounts

On Fri, Jun 19, 2020 at 08:39:48AM +1000, Dave Chinner wrote:
> This will prevent SB_I_VERSION from being turned off at all. That
> will break existing filesystems that allow SB_I_VERSION to be turned
> off on remount, such as ext4.
> 
> The manipulations here need to be in the filesystem specific code;
> we screwed this one up so badly there is no "one size fits all"
> behaviour that we can implement in the generic code...

Yes.  SB_I_VERSION should never be set by common code.