linux-kernel - Re: [PATCH] ocfs2: reduce ioctl stack usage

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Message-ID: <20230418180202.GA602488@mit.edu>
Date:   Tue, 18 Apr 2023 14:02:02 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Christian Brauner <brauner@...nel.org>
Cc:     Joseph Qi <joseph.qi@...ux.alibaba.com>,
        Mark Fasheh <mark@...heh.com>,
        Joel Becker <jlbec@...lplan.org>,
        Arnd Bergmann <arnd@...nel.org>,
        akpm <akpm@...ux-foundation.org>, Arnd Bergmann <arnd@...db.de>,
        ocfs2-devel <ocfs2-devel@....oracle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ocfs2: reduce ioctl stack usage

On Tue, Apr 18, 2023 at 02:56:38PM +0200, Christian Brauner wrote:
> On Tue, Apr 18, 2023 at 05:37:06PM +0800, Joseph Qi wrote:
> > Andrew picked ocfs2 patches into -mm tree before.
> 
> Yup and that's fine obviously, but this belongs to fs/ and we're aiming
> to take fs/ stuff through the dedicated fs trees going forward.

The challenge here is that there isn't an active ocfs2 tree at the
moment (git/jlbec/ocfs2.git was last updated 11 years ago), and it's
not clear ocfs2 has an active maintainer, although as discussed at a
recent ext4 telechat, there still are some enterprise users of it
hanging on.

We're starting considering changes to fs/jbd2 so we can get off of
using the struct bh for jbd2 (still very early days; it's more in the
early concept brain-storming stage.)  And since ocfs2 also uses
fs/jbd2, the fact that ocfs2 isn't under active maintenance is going
to be more of a challenge moving forward.

Something we should discuss in the hallway track of LSF/MM, perhaps...

							- Ted