Received-SPF: pass (google.com: domain of linux-ext4-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Fri, 19 Jun 2020 06:17:13 -0700
From:   Christoph Hellwig <hch@infradead.org>
To:     Dave Chinner <david@fromorbit.com>
Cc:     Masayoshi Mizuma <msys.mizuma@gmail.com>,
        "J. Bruce Fields" <bfields@fieldses.org>,
        Eric Sandeen <sandeen@sandeen.net>,
        "Darrick J. Wong" <darrick.wong@oracle.com>,
        Christoph Hellwig <hch@infradead.org>,
        Theodore Ts'o <tytso@mit.edu>,
        Andreas Dilger <adilger.kernel@dilger.ca>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>,
        linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        linux-xfs <linux-xfs@vger.kernel.org>
Subject: Re: [PATCH] fs: i_version mntopt gets visible through /proc/mounts
Message-ID: <20200619131713.GA15982@infradead.org>
References: <24692989-2ee0-3dcc-16d8-aa436114f5fb@sandeen.net>
 <20200617172456.GP11245@magnolia>
 <8f0df756-4f71-9d96-7a52-45bf51482556@sandeen.net>
 <20200617181816.GA18315@fieldses.org>
 <4cbb5cbe-feb4-2166-0634-29041a41a8dc@sandeen.net>
 <20200617184507.GB18315@fieldses.org>
 <20200618013026.ewnhvf64nb62k2yx@gabell>
 <20200618030539.GH2005@dread.disaster.area>
 <20200618034535.h5ho7pd4eilpbj3f@gabell>
 <20200618223948.GI2005@dread.disaster.area>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20200618223948.GI2005@dread.disaster.area>
Sender: linux-ext4-owner@vger.kernel.org
Precedence: bulk

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.