From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 047A373529 for ; Wed, 28 Feb 2024 12:11:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709122264; cv=none; b=MvB7CpdNnZPPGyDLxcqukfPNEncAQRRDpqYmva6T2g8jd6rgpDNCHbgEBGvaEgx4D4Rf31wMtbEoleeF5WQ/m/VpIw3QycWtWMuJofJwIGDaeXK9U1dUCL3ESU5Na78PC9bv6sTRgqyFP916SNBidTns61E8y93C/yg/3W7Wb+M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709122264; c=relaxed/simple; bh=mU1+Bp1Q38H0/zJMPy1+Gqlp5uuFxCoeEDhsvj7Yf7g=; h=Message-ID:Subject:From:To:Cc:Date:Content-Type:MIME-Version; b=qt3vcjhfbraj5XaootJWZpk2nM+vyrfrEeai1aqH7IivRoluETso9vOUqZs7EJw9BYPAAqx8khCBbKRO0xPGQiH06P86X7gPrKYeB8Qc5rSfdPbTdZew3s+NA+6q7pk8KDZa5Id9nzTUMQK5A23ovLyZDTiDJuOIb/e4xD9Dhyg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ou57I/JX; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ou57I/JX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2F138C433C7; Wed, 28 Feb 2024 12:11:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1709122263; bh=mU1+Bp1Q38H0/zJMPy1+Gqlp5uuFxCoeEDhsvj7Yf7g=; h=Subject:From:To:Cc:Date:From; b=ou57I/JXZYVI0gUZrXUjX45IY5nd2I0HZj5GI2pvqp79BGBBSucuEysCkNy7JOyKL D0pfoYoVnm3bgyEB31H4wV2MvXqvYIg5ytnwUmodZQrkf43nT9Xwts5L9j4GkmhUoc oxd5QNcdu5dn3XwFfu2pq6LUR0wtI6/YK2hWLQWtjeHUrw7fNWIk6VzPA79W08nK7J wfiXxM/FH06YZBwfVqEwt6zDNo3hLKA3zB0u+WHBeLTWiEuQyyuqMxAWsfkAwSKtfX P9lzaXy7x3uaT4rKhGCZF4wP/vrQrhribuk3OfgVSGxrhRNofGtFwuwmcz14OM1F5p vwEl1VGK1zG6A== Message-ID: Subject: [LSF/MM/BPF TOPIC] inode timestamps and change cookie From: Jeff Layton To: lsf-pc Cc: linux-fsdevel , Amir Goldstein Date: Wed, 28 Feb 2024 07:11:02 -0500 Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.4 (3.50.4-1.fc39) Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Last year, I led a discussion at LSF about the inode change cookie value (aka i_version). The original impetus for this work was the fact that all 3 mainstream local filesystems (btrfs, ext4 and xfs) updated the value for different sorts of activity, which can cause wildly different behavior when the filesystem is exported via NFS. My hope last year was that we could fix this with multigrain timestamps [1], but that didn't pan out. At LSF, I'd like to give a brief overview of state of i_version work, and lead a discussion on what work remains. [1]: https://lwn.net/Articles/938240/ Thanks! --=20 Jeff Layton