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 66A6438B9B9; Wed, 7 Jan 2026 15:44:04 +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=1767800644; cv=none; b=MjOfDd3mUQGJRIDIxijpYgh0W8lzGt1c0XeLQ8cLKf23Z1T80EsRMTHOyNoS3KPRQgAy4imRiuXF5OjEjzfnJWX3riWcGha+jTkRI962W//4vPvcMy3e47+h1bdtxd+aowHCIyFlm2gJBfv6zpob8uVY6HlqKyuvYeUNioyx7JE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767800644; c=relaxed/simple; bh=K/JIIo+H07Yrj3208zgCE5Jh+b6Xxc5/95lox3QQ068=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=ifH6Q/4r8JfymWNNvZ4sLGe5xhorw3m5j8DLN2FmjDai59N8Hh1N4SHxx5YxnEJWkR1Mggd6cMs3VkXK/JcdS+BP/YLIgiFIkkmNibcBgovl10pLmVky5hTflivkZWNR2Ektp8P8eO4xaJC+u8QSKTV/FTGvHFHv9guFHpJjlHQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=YLO1UKRP; 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="YLO1UKRP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 62A06C4CEF1; Wed, 7 Jan 2026 15:44:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767800644; bh=K/JIIo+H07Yrj3208zgCE5Jh+b6Xxc5/95lox3QQ068=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=YLO1UKRPsA93MJ7YptG6zG0qIzE64BEN0RQhZx+4uoMb/n7+GAN2nD4wbVaHEZoX6 D47A2kzq9J2seYEVSjSqSaQYI1aQ7Rp5LW2tYz0oKGmLcqKZa75sOJUiWKcYOXDgLy ye86zrosdLwqFMtVsycscj6WntFBF5WMBSb+88zu0NOVuH3bakOWPFrWHL59qukZA0 R9wwQ/bW/goMyCGHZLhwvwr2ftf1a83+Xl2LLHBfUWZkTa2qaADp9TPJHzJr+iRT5O 2ePV9Q/muREQKOeGKUt7BpqDE4tpxSL2Y7Sp/8SbxzMRDoQmN8Pnu1zS1XYodrX80F x5Bb1LDKOJuIQ== Message-ID: <77f5f47510472760ded83b343efb6be9a2afe2b7.camel@kernel.org> Subject: Re: [PATCH 0/6] vfs: properly deny directory leases on filesystems with special lease handling From: Jeff Layton To: Christoph Hellwig Cc: Christian Brauner , Al Viro , Jan Kara , Steve French , Paulo Alcantara , Ronnie Sahlberg , Shyam Prasad N , Tom Talpey , Bharath SM , Trond Myklebust , Anna Schumaker , Eric Van Hensbergen , Latchesar Ionkov , Dominique Martinet , Christian Schoenebeck , Andreas Gruenbacher , Xiubo Li , Ilya Dryomov , Hans de Goede , NeilBrown , linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, v9fs@lists.linux.dev, gfs2@lists.linux.dev, ceph-devel@vger.kernel.org, linux-fsdevel@vger.kernel.org Date: Wed, 07 Jan 2026 10:44:00 -0500 In-Reply-To: References: 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f8lfK1XVNbRq/R7GZ9zHESlsa35ha60yd/j3pu5hT2xyy8krV8vGhHvnJ1XRMJBAB/UYb6FyC7S+m QZIQXVeAA+smfTT0tDrisj1U5x6ZB9b3nBg65kc= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.2 (3.58.2-1.fc43) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2026-01-07 at 07:32 -0800, Christoph Hellwig wrote: > On Wed, Jan 07, 2026 at 09:20:08AM -0500, Jeff Layton wrote: > > Long term, I think it would be best to change leases/delegations to be > > an opt-in thing, such that leases are always denied by default if the > > method isn't set. >=20 > Agreed. >=20 > > That's a larger patchset though as we'd need to audit > > all of the file_operations that currently have ->setlease() as NULL. >=20 > Initially you can just wire them up everywhere. But I guess that would > be overkill.=20 That is probably the simplest approach, but there are literally thousands of file_operations structures. Most are in driver code and have no business dealing with leases. Technically, I guess you can set a lease on those fd's today, but likely no one ever does it. We probably also don't really need lease support in (e.g.) sysfs, debugfs, etc. I'm not sure if there is anything that prevents them there. I think what we probably want to do is wire them up in most filesystems under fs/. Basically, in anything that might reasonably be exportable via NFS or SMB, and have the rest deny them. We might get a few regressions with that approach but if so we would have an opportunity to dig into why people are setting leases on these more "exotic" filesystems too. --=20 Jeff Layton