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 9852B2C0294; Mon, 12 Jan 2026 14:50:29 +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=1768229429; cv=none; b=AwK8ZP07ezB+Ig3ihqe8AuNpTkRNJ1FWFdpfVWkcocbj0ia1zO5PaSvWCTTEgfsR1Zt9tcnz/GngbRIcGF7hlIhKEjuFwXIjr9RN+t7H9vWiZKm6IXBIZEeldZUZ1gbIMjfJFpj9Kdwdjlq5SEVu0ZzngTggqVzgNax8KHckgnE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768229429; c=relaxed/simple; bh=cheSnBLxN544y0UKkw10KpgjiO68XnZpyeYuNQCu1SI=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=kY20/c/FxjOZ2G8iL3Ie10tORBAPO56cvbGteBNzB8l80lSn3jZNqBM9cvPa9MOOgzRRzIk0LnDKINUYoH9XV0FCuGlR5rIKn7y4hpkxsgCGsEdgmFUrT/EqkD+LCI/lTkDhPlT9u7xHEorNnM2nbd8sMDf2VYOGRg7HI+D8Wmw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UpMEz5TH; 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="UpMEz5TH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8E8AEC16AAE; Mon, 12 Jan 2026 14:50:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768229429; bh=cheSnBLxN544y0UKkw10KpgjiO68XnZpyeYuNQCu1SI=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=UpMEz5THVo05QbZ/pAisnu0HRhesOIjE2rYftbA7FBhGQj5tCikdbZP3s9Z/gB+1y k8fYirWnboJmtXtByE43Gev4eWZMrnZp2xsCYHsMHZKKPwK6nyAzNy2SlEd6q6RdQX E9BsB3Zeg8leNoOsSqkZw9UMTUfEJ1CwpbuRjO/ZsHVZdkTGXi72eLukzZew16H4By 2V8I14GVLtY2HkAvnbTAdK8f8SFRaA/5FSsShCjCBoX+/4KLO8Va98nCZCU0IF7NSt 5mEIqfFpYxDWcq+lTy0EQTI0buuA/J9QluBW76YeWrm5Yt8NF684D6eD5hHIR3dAHu cDKQUbKLqjwJw== Message-ID: Subject: Re: [PATCH 00/24] vfs: require filesystems to explicitly opt-in to lease support From: Jeff Layton To: Chuck Lever , Amir Goldstein , Christian Brauner Cc: Jan Kara , Luis de Bethencourt , Salah Triki , Nicolas Pitre , Christoph Hellwig , Anders Larsen , Alexander Viro , David Sterba , Chris Mason , Gao Xiang , Chao Yu , Yue Hu , Jeffle Xu , Sandeep Dhavale , Hongbo Li , Chunhai Guo , Jan Kara , Theodore Ts'o , Andreas Dilger , Jaegeuk Kim , OGAWA Hirofumi , David Woodhouse , Richard Weinberger , Dave Kleikamp , Ryusuke Konishi , Viacheslav Dubeyko , Konstantin Komarov , Mark Fasheh , Joel Becker , Joseph Qi , Mike Marshall , Martin Brandenburg , Miklos Szeredi , Phillip Lougher , Carlos Maiolino , Hugh Dickins , Baolin Wang , Andrew Morton , Namjae Jeon , Sungjong Seo , Yuezhang Mo , Alexander Aring , Andreas Gruenbacher , Jonathan Corbet , "Matthew Wilcox (Oracle)" , Eric Van Hensbergen , Latchesar Ionkov , Dominique Martinet , Christian Schoenebeck , Xiubo Li , Ilya Dryomov , Trond Myklebust , Anna Schumaker , Steve French , Paulo Alcantara , Ronnie Sahlberg , Shyam Prasad N , Tom Talpey , Bharath SM , Hans de Goede , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-mtd@lists.infradead.org, jfs-discussion@lists.sourceforge.net, linux-nilfs@vger.kernel.org, ntfs3@lists.linux.dev, ocfs2-devel@lists.linux.dev, devel@lists.orangefs.org, linux-unionfs@vger.kernel.org, linux-xfs@vger.kernel.org, linux-mm@kvack.org, gfs2@lists.linux.dev, linux-doc@vger.kernel.org, v9fs@lists.linux.dev, ceph-devel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org Date: Mon, 12 Jan 2026 09:50:20 -0500 In-Reply-To: References: <20260108-setlease-6-20-v1-0-ea4dec9b67fa@kernel.org> <8af369636c32b868f83669c49aea708ca3b894ac.camel@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV YrOOI5VGLHge0awt7bhMCTM9KAfPc+xL/ZxAMVWd3NCk5SamL2cE99UWgtvNOIYU8m6EjTLhsj8sn VluJH0/RcxEeFbnSaswVChNSGa7mXJrTR22lRL6ZPjdMgS2Km90haWPRc8Wolcz07Y2se0xpGVLEQ cDEsvv5IMmeMe1/qLZ6NaVkNuL3WOXvxaVT9USW1+/SGipO2IpKJjeDZfehlB/kpfF24+RrK+seQf CBYyUE8QJpvTZyfUHNYldXlrjO6n5MdOempLqWpfOmcGkwnyNRBR46g/jf8KnPRwXs509yAqDB6sE LZH+yWr9LQZEwARAQABtCVKZWZmIExheXRvbiA8amxheXRvbkBwb29jaGllcmVkcy5uZXQ+iQI7BB 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aEZCiDOq0anx6FmOzs5E6Jqdpo/mtI8beK+BE7Va6ni7YrQlnT0i3vaTVMTiCThbqsB20VrbMjlhp 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: ceph-devel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2026-01-12 at 09:31 -0500, Chuck Lever wrote: > On 1/12/26 8:34 AM, Jeff Layton wrote: > > On Fri, 2026-01-09 at 19:52 +0100, Amir Goldstein wrote: > > > On Thu, Jan 8, 2026 at 7:57=E2=80=AFPM Jeff Layton wrote: > > > >=20 > > > > On Thu, 2026-01-08 at 18:40 +0100, Jan Kara wrote: > > > > > On Thu 08-01-26 12:12:55, Jeff Layton wrote: > > > > > > Yesterday, I sent patches to fix how directory delegation suppo= rt is > > > > > > handled on filesystems where the should be disabled [1]. That s= et is > > > > > > appropriate for v6.19. For v7.0, I want to make lease support b= e more > > > > > > opt-in, rather than opt-out: > > > > > >=20 > > > > > > For historical reasons, when ->setlease() file_operation is set= to NULL, > > > > > > the default is to use the kernel-internal lease implementation.= This > > > > > > means that if you want to disable them, you need to explicitly = set the > > > > > > ->setlease() file_operation to simple_nosetlease() or the equiv= alent. > > > > > >=20 > > > > > > This has caused a number of problems over the years as some fil= esystems > > > > > > have inadvertantly allowed leases to be acquired simply by havi= ng left > > > > > > it set to NULL. It would be better if filesystems had to opt-in= to lease > > > > > > support, particularly with the advent of directory delegations. > > > > > >=20 > > > > > > This series has sets the ->setlease() operation in a pile of ex= isting > > > > > > local filesystems to generic_setlease() and then changes > > > > > > kernel_setlease() to return -EINVAL when the setlease() operati= on is not > > > > > > set. > > > > > >=20 > > > > > > With this change, new filesystems will need to explicitly set t= he > > > > > > ->setlease() operations in order to provide lease and delegatio= n > > > > > > support. > > > > > >=20 > > > > > > I mainly focused on filesystems that are NFS exportable, since = NFS and > > > > > > SMB are the main users of file leases, and they tend to end up = exporting > > > > > > the same filesystem types. Let me know if I've missed any. > > > > >=20 > > > > > So, what about kernfs and fuse? They seem to be exportable and do= n't have > > > > > .setlease set... > > > > >=20 > > > >=20 > > > > Yes, FUSE needs this too. I'll add a patch for that. > > > >=20 > > > > As far as kernfs goes: AIUI, that's basically what sysfs and resctr= l > > > > are built on. Do we really expect people to set leases there? > > > >=20 > > > > I guess it's technically a regression since you could set them on t= hose > > > > sorts of files earlier, but people don't usually export kernfs base= d > > > > filesystems via NFS or SMB, and that seems like something that coul= d be > > > > used to make mischief. > > > >=20 > > > > AFAICT, kernfs_export_ops is mostly to support open_by_handle_at().= See > > > > commit aa8188253474 ("kernfs: add exportfs operations"). > > > >=20 > > > > One idea: we could add a wrapper around generic_setlease() for > > > > filesystems like this that will do a WARN_ONCE() and then call > > > > generic_setlease(). That would keep leases working on them but we m= ight > > > > get some reports that would tell us who's setting leases on these f= iles > > > > and why. > > >=20 > > > IMO, you are being too cautious, but whatever. > > >=20 > > > It is not accurate that kernfs filesystems are NFS exportable in gene= ral. > > > Only cgroupfs has KERNFS_ROOT_SUPPORT_EXPORTOP. > > >=20 > > > If any application is using leases on cgroup files, it must be some > > > very advanced runtime (i.e. systemd), so we should know about the > > > regression sooner rather than later. > > >=20 > >=20 > > I think so too. For now, I think I'll not bother with the WARN_ONCE(). > > Let's just leave kernfs out of the set until someone presents a real > > use-case. > >=20 > > > There are also the recently added nsfs and pidfs export_operations. > > >=20 > > > I have a recollection about wanting to be explicit about not allowing > > > those to be exportable to NFS (nsfs specifically), but I can't see wh= ere > > > and if that restriction was done. > > >=20 > > > Christian? Do you remember? > > >=20 > >=20 > > (cc'ing Chuck) > >=20 > > FWIW, you can currently export and mount /sys/fs/cgroup via NFS. The > > directory doesn't show up when you try to get to it via NFSv4, but you > > can mount it using v3 and READDIR works. The files are all empty when > > you try to read them. I didn't try to do any writes. > >=20 > > Should we add a mechanism to prevent exporting these sorts of > > filesystems? > >=20 > > Even better would be to make nfsd exporting explicitly opt-in. What if > > we were to add a EXPORT_OP_NFSD flag that explicitly allows filesystems > > to opt-in to NFS exporting, and check for that in __fh_verify()? We'd > > have to add it to a bunch of existing filesystems, but that's fairly > > simple to do with an LLM. >=20 > What's the active harm in exporting /sys/fs/cgroup ? It has to be done > explicitly via /etc/exports, so this is under the NFS server admin's > control. Is it an attack surface? >=20 Potentially? I don't see any active harm with exporting cgroupfs. It doesn't work right via nfsd, but it's not crashing the box or anything. At one time, those were only defined by filesystems that wanted to allow NFS export. Now we've grown them on filesystems that just want to provide filehandles for open_by_handle_at() and the like. nfsd doesn't care though: if the fs has export operations, it'll happily use them. Having an explicit "I want to allow nfsd" flag see ms like it might save us some headaches in the future when other filesystems add export ops for this sort of filehandle use. --=20 Jeff Layton From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.sourceforge.net (lists.sourceforge.net [216.105.38.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id CA7A4C9EC94 for ; Mon, 12 Jan 2026 14:50:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.sourceforge.net; s=beta; h=Content-Transfer-Encoding:Content-Type:Cc: Reply-To:From:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:Subject:MIME-Version:References:In-Reply-To:Date:To: Message-ID:Sender:Content-ID:Content-Description:Resent-Date:Resent-From: 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CHqumUHRry+RF0lH00clzX/W8OrQJZtoBPXv9ahka/Vp7kEulcBJr1cH5Wz/WprhsIM7U9pse1f1g Yy9YbXtWctUz8uvDR7shsQxAhX3qO7DilMtuGo1v97I/Kx4gXQ52syh/w6EBny71CZrOgD6kJwPVV AaM1LRC28muq91WCFhs/nzHozpbzcheyGtMUI2Ao4K6mnY+3zIuXPygZMFr9KXE6fF7HzKxKuZMJO aEZCiDOq0anx6FmOzs5E6Jqdpo/mtI8beK+BE7Va6ni7YrQlnT0i3vaTVMTiCThbqsB20VrbMjlhp f8lfK1XVNbRq/R7GZ9zHESlsa35ha60yd/j3pu5hT2xyy8krV8vGhHvnJ1XRMJBAB/UYb6FyC7S+m QZIQXVeAA+smfTT0tDrisj1U5x6ZB9b3nBg65kc= User-Agent: Evolution 3.58.2 (3.58.2-1.fc43) MIME-Version: 1.0 X-Headers-End: 1vfJFb-0000BZ-QK Subject: Re: [f2fs-dev] [PATCH 00/24] vfs: require filesystems to explicitly opt-in to lease support X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Jeff Layton via Linux-f2fs-devel Reply-To: Jeff Layton Cc: Latchesar Ionkov , Dave Kleikamp , Alexander Aring , Jan Kara , Paulo Alcantara , Sandeep Dhavale , Martin Brandenburg , Yuezhang Mo , Anders Larsen , Christian Schoenebeck , jfs-discussion@lists.sourceforge.net, linux-unionfs@vger.kernel.org, Konstantin Komarov , Chris Mason , Andreas Dilger , Chunhai Guo , Ilya Dryomov , Ronnie Sahlberg , linux-mtd@lists.infradead.org, Mike Marshall , linux-xfs@vger.kernel.org, Xiubo Li , Yue Hu , Miklos Szeredi , Richard Weinberger , Mark Fasheh , devel@lists.orangefs.org, Hugh Dickins , "Matthew Wilcox \(Oracle\)" , ntfs3@lists.linux.dev, Christoph Hellwig , Joseph Qi , linux-mm@kvack.org, Viacheslav Dubeyko , linux-btrfs@vger.kernel.org, Gao Xiang , linux-ext4@vger.kernel.org, Salah Triki , Carlos Maiolino , Dominique Martinet , Shyam Prasad N , samba-technical@lists.samba.org, linux-cifs@vger.kernel.org, Tom Talpey , ocfs2-devel@lists.linux.dev, Bharath SM , linux-nilfs@vger.kernel.org, David Sterba , Alexander Viro , Baolin Wang , Jeffle Xu , Jaegeuk Kim , ceph-devel@vger.kernel.org, Eric Van Hensbergen , Ryusuke Konishi , OGAWA Hirofumi , Andreas Gruenbacher , Hans de Goede , gfs2@lists.linux.dev, linux-nfs@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, Theodore Ts'o , Luis de Bethencourt , Nicolas Pitre , linux-erofs@lists.ozlabs.org, v9fs@lists.linux.dev, Jonathan Corbet , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Namjae Jeon , Steve French , Hongbo Li , Anna Schumaker , Jan Kara , linux-fsdevel@vger.kernel.org, Phillip Lougher , Andrew Morton , Sungjong Seo , David Woodhouse , Trond Myklebust , Joel Becker Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net T24gTW9uLCAyMDI2LTAxLTEyIGF0IDA5OjMxIC0wNTAwLCBDaHVjayBMZXZlciB3cm90ZToKPiBP biAxLzEyLzI2IDg6MzQgQU0sIEplZmYgTGF5dG9uIHdyb3RlOgo+ID4gT24gRnJpLCAyMDI2LTAx LTA5IGF0IDE5OjUyICswMTAwLCBBbWlyIEdvbGRzdGVpbiB3cm90ZToKPiA+ID4gT24gVGh1LCBK YW4gOCwgMjAyNiBhdCA3OjU34oCvUE0gSmVmZiBMYXl0b24gPGpsYXl0b25Aa2VybmVsLm9yZz4g d3JvdGU6Cj4gPiA+ID4gCj4gPiA+ID4gT24gVGh1LCAyMDI2LTAxLTA4IGF0IDE4OjQwICswMTAw 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Message-ID: Subject: Re: [PATCH 00/24] vfs: require filesystems to explicitly opt-in to lease support From: Jeff Layton To: Chuck Lever , Amir Goldstein , Christian Brauner Cc: Jan Kara , Luis de Bethencourt , Salah Triki , Nicolas Pitre , Christoph Hellwig , Anders Larsen , Alexander Viro , David Sterba , Chris Mason , Gao Xiang , Chao Yu , Yue Hu , Jeffle Xu , Sandeep Dhavale , Hongbo Li , Chunhai Guo , Jan Kara , Theodore Ts'o , Andreas Dilger , Jaegeuk Kim , OGAWA Hirofumi , David Woodhouse , Richard Weinberger , Dave Kleikamp , Ryusuke Konishi , Viacheslav Dubeyko , Konstantin Komarov , Mark Fasheh , Joel Becker , Joseph Qi , Mike Marshall , Martin Brandenburg , Miklos Szeredi , Phillip Lougher , Carlos Maiolino , Hugh Dickins , Baolin Wang , Andrew Morton , Namjae Jeon , Sungjong Seo , Yuezhang Mo , Alexander Aring , Andreas Gruenbacher , Jonathan Corbet , "Matthew Wilcox (Oracle)" , Eric Van Hensbergen , Latchesar Ionkov , Dominique Martinet , Christian Schoenebeck , Xiubo Li , Ilya Dryomov , Trond Myklebust , Anna Schumaker , Steve French , Paulo Alcantara , Ronnie Sahlberg , Shyam Prasad N , Tom Talpey , Bharath SM , Hans de Goede , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-mtd@lists.infradead.org, jfs-discussion@lists.sourceforge.net, linux-nilfs@vger.kernel.org, ntfs3@lists.linux.dev, ocfs2-devel@lists.linux.dev, devel@lists.orangefs.org, linux-unionfs@vger.kernel.org, linux-xfs@vger.kernel.org, linux-mm@kvack.org, gfs2@lists.linux.dev, linux-doc@vger.kernel.org, v9fs@lists.linux.dev, ceph-devel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org Date: Mon, 12 Jan 2026 09:50:20 -0500 In-Reply-To: References: <20260108-setlease-6-20-v1-0-ea4dec9b67fa@kernel.org> <8af369636c32b868f83669c49aea708ca3b894ac.camel@kernel.org> Autocrypt: addr=jlayton@kernel.org; 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3.58.2 (3.58.2-1.fc43) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260112_065030_441001_339F28C2 X-CRM114-Status: GOOD ( 50.85 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org T24gTW9uLCAyMDI2LTAxLTEyIGF0IDA5OjMxIC0wNTAwLCBDaHVjayBMZXZlciB3cm90ZToKPiBP biAxLzEyLzI2IDg6MzQgQU0sIEplZmYgTGF5dG9uIHdyb3RlOgo+ID4gT24gRnJpLCAyMDI2LTAx LTA5IGF0IDE5OjUyICswMTAwLCBBbWlyIEdvbGRzdGVpbiB3cm90ZToKPiA+ID4gT24gVGh1LCBK YW4gOCwgMjAyNiBhdCA3OjU34oCvUE0gSmVmZiBMYXl0b24gPGpsYXl0b25Aa2VybmVsLm9yZz4g d3JvdGU6Cj4gPiA+ID4gCj4gPiA+ID4gT24gVGh1LCAyMDI2LTAxLTA4IGF0IDE4OjQwICswMTAw 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