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[100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id CAF3F43E3E; Fri, 16 Jan 2026 12:36:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 45991C116C6; Fri, 16 Jan 2026 12:36:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768566993; bh=V1jrhNoK5cCQTJSoALhV/3tjORnC8kLYjZ7KEvDFFVc=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=vITXplasW3zR6PcKilzha47uoXjvXShL598ig5Pb8VgWfcug9BDkf0WupjrNAL5Et 0VoJoWqdfjuLfwPbce+AemVdrqVOau96IwktWx383Bj//MA+PbsSw7nvAdAc4S+ZX1 8rOlBc7yMdVVsUE3Ofi54rmHLIFViAOk6lOCxZtdFwNsqFozBLolEGPivTlpnNQY5O rhETVuPU6xUeO0o+nobpQfQiylPvTPdRK8rBpYPkaHOd5XqBW2cUkmi0/vCGbWfwII 29fFW3+5rWCirglU+pxv5fL/yxUQX4dQ/TPNhD2e8wYiigfkW4EWhFHHMpHiIWSR5i T3ILgYkV5/bGw== Message-ID: <8e4c3df4828351c677186bf018061f2b1fd1b48e.camel@kernel.org> Subject: Re: [PATCH 29/29] nfsd: only allow filesystems that set EXPORT_OP_STABLE_HANDLES From: Jeff Layton To: Amir Goldstein Cc: Christian Brauner , Alexander Viro , Chuck Lever , NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey , Hugh Dickins , Baolin Wang , Andrew Morton , Theodore Ts'o , Andreas Dilger , Jan Kara , Gao Xiang , Chao Yu , Yue Hu , Jeffle Xu , Sandeep Dhavale , Hongbo Li , Chunhai Guo , Carlos Maiolino , Ilya Dryomov , Alex Markuze , Viacheslav Dubeyko , Chris Mason , David Sterba , Luis de Bethencourt , Salah Triki , Phillip Lougher , Steve French , Paulo Alcantara , Ronnie Sahlberg , Shyam Prasad N , Bharath SM , Miklos Szeredi , Mike Marshall , Martin Brandenburg , Mark Fasheh , Joel Becker , Joseph Qi , Konstantin Komarov , Ryusuke Konishi , Trond Myklebust , Anna Schumaker , Dave Kleikamp , David Woodhouse , Richard Weinberger , Jan Kara , Andreas Gruenbacher , OGAWA Hirofumi , Jaegeuk Kim , Christoph Hellwig , linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-ext4@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-xfs@vger.kernel.org, ceph-devel@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-unionfs@vger.kernel.org, devel@lists.orangefs.org, ocfs2-devel@lists.linux.dev, ntfs3@lists.linux.dev, linux-nilfs@vger.kernel.org, jfs-discussion@lists.sourceforge.net, linux-mtd@lists.infradead.org, gfs2@lists.linux.dev, linux-f2fs-devel@lists.sourceforge.net Date: Fri, 16 Jan 2026 07:36:26 -0500 In-Reply-To: References: <20260115-exportfs-nfsd-v1-0-8e80160e3c0c@kernel.org> <20260115-exportfs-nfsd-v1-29-8e80160e3c0c@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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nlTFTuPoPyiNU5a+SpK9na9viGI6FWArKVzT8WdU3x4Ufd0iaTgDIiyToexhBlBlgzGMwhEWTtAfe4/VEQF+g/auqwJ5yFiRp3ZO3/HV5QiBbZnCP3+9h5FpnUi6WmXrYW5oXwkDdzK1RyV/IDDihm549KVN5zjpdhngWRLjT8bvFeB4XQLZfcACLcGdTzzdKmIiANWzp1kEvbdnj0Ls53kmzMAhC6HrlJT53erI1JgMmvG5DFtH4JK48bIjYPIvr+2JdsKZgMT3DY0+7Q5j64TroDws3OXDW6LRLFDddMlpkGeaHjQR20pHTifsu3tPCZ0Xeg6SAD5PDDYCgY5oCdulbJl3Yv6pzb0cyH5bIP6CzVYE= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, 2026-01-15 at 20:23 +0100, Amir Goldstein wrote: > On Thu, Jan 15, 2026 at 6:51=E2=80=AFPM Jeff Layton = wrote: > >=20 > > Some filesystems have grown export operations in order to provide > > filehandles for local usage. Some of these filesystems are unsuitable > > for use with nfsd, since their filehandles are not persistent across > > reboots. > >=20 > > In __fh_verify, check whether EXPORT_OP_STABLE_HANDLES is set > > and return nfserr_stale if it isn't. > >=20 > > Signed-off-by: Jeff Layton > > --- > > fs/nfsd/nfsfh.c | 4 ++++ > > 1 file changed, 4 insertions(+) > >=20 > > diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c > > index ed85dd43da18e6d4c4667ff14dc035f2eacff1d6..da9d5fb2e6613c2707195da= 2e8678b3fcb3d444d 100644 > > --- a/fs/nfsd/nfsfh.c > > +++ b/fs/nfsd/nfsfh.c > > @@ -334,6 +334,10 @@ __fh_verify(struct svc_rqst *rqstp, > > dentry =3D fhp->fh_dentry; > > exp =3D fhp->fh_export; > >=20 > > + error =3D nfserr_stale; > > + if (!(dentry->d_sb->s_export_op->flags & EXPORT_OP_STABLE_HANDL= ES)) > > + goto out; > > + > > trace_nfsd_fh_verify(rqstp, fhp, type, access); > >=20 >=20 > IDGI. Don't you want to deny the export of those fs in check_export()? > By the same logic that check_export() checks for can_decode_fh() > not for can_encode_fh(). >=20 It certainly won't hurt to add a check for this to check_export(), and I've gone ahead and done so. To be clear, doing that won't prevent the filesystem from being exported, but you will get a warning like this when you try: exportfs: /sys/fs/cgroup does not support NFS export That export will still show up in mountd though, so this is just a warning. Trying to mount it though will fail. Thanks, --=20 Jeff Layton