linux-kernel - Re: [PATCH v8 0/5] fs: multigrain timestamps for XFS's change

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Message-ID: <20230924-mitfeiern-vorladung-13092c2af585@brauner>
Date:   Sun, 24 Sep 2023 13:31:20 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     Jeff Layton <jlayton@...nel.org>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Chuck Lever <chuck.lever@...cle.com>,
        Neil Brown <neilb@...e.de>,
        Olga Kornievskaia <kolga@...app.com>,
        Dai Ngo <Dai.Ngo@...cle.com>, Tom Talpey <tom@...pey.com>,
        Chandan Babu R <chandan.babu@...cle.com>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.cz>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Kent Overstreet <kent.overstreet@...ux.dev>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nfs@...r.kernel.org, linux-xfs@...r.kernel.org
Subject: Re: [PATCH v8 0/5] fs: multigrain timestamps for XFS's change_cookie

> My initial goal was to implement multigrain timestamps on most major
> filesystems, so we could present them to userland, and use them for
> NFSv3, etc.

If there's no clear users and workloads depending on this other than for
the sake of NFS then we shouldn't expose this to userspace. We've tried
this and I'm not convinced we're getting anything other than regressions
out of it. Keep it internal and confined to the filesystem that actually
needs this.