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Message-Id: <20260115-exportfs-nfsd-v1-0-8e80160e3c0c@kernel.org>
Date: Thu, 15 Jan 2026 12:47:31 -0500
From: Jeff Layton <jlayton@...nel.org>
To: Christian Brauner <brauner@...nel.org>,
Alexander Viro <viro@...iv.linux.org.uk>,
Chuck Lever <chuck.lever@...cle.com>, NeilBrown <neil@...wn.name>,
Olga Kornievskaia <okorniev@...hat.com>, Dai Ngo <Dai.Ngo@...cle.com>,
Tom Talpey <tom@...pey.com>, Amir Goldstein <amir73il@...il.com>,
Hugh Dickins <hughd@...gle.com>,
Baolin Wang <baolin.wang@...ux.alibaba.com>,
Andrew Morton <akpm@...ux-foundation.org>, Theodore Ts'o <tytso@....edu>,
Andreas Dilger <adilger.kernel@...ger.ca>, Jan Kara <jack@...e.com>,
Gao Xiang <xiang@...nel.org>, Chao Yu <chao@...nel.org>,
Yue Hu <zbestahu@...il.com>, Jeffle Xu <jefflexu@...ux.alibaba.com>,
Sandeep Dhavale <dhavale@...gle.com>, Hongbo Li <lihongbo22@...wei.com>,
Chunhai Guo <guochunhai@...o.com>, Carlos Maiolino <cem@...nel.org>,
Ilya Dryomov <idryomov@...il.com>, Alex Markuze <amarkuze@...hat.com>,
Viacheslav Dubeyko <slava@...eyko.com>, Chris Mason <clm@...com>,
David Sterba <dsterba@...e.com>, Luis de Bethencourt <luisbg@...nel.org>,
Salah Triki <salah.triki@...il.com>,
Phillip Lougher <phillip@...ashfs.org.uk>, Steve French <sfrench@...ba.org>,
Paulo Alcantara <pc@...guebit.org>,
Ronnie Sahlberg <ronniesahlberg@...il.com>,
Shyam Prasad N <sprasad@...rosoft.com>,
Bharath SM <bharathsm@...rosoft.com>, Miklos Szeredi <miklos@...redi.hu>,
Mike Marshall <hubcap@...ibond.com>,
Martin Brandenburg <martin@...ibond.com>, Mark Fasheh <mark@...heh.com>,
Joel Becker <jlbec@...lplan.org>, Joseph Qi <joseph.qi@...ux.alibaba.com>,
Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
Ryusuke Konishi <konishi.ryusuke@...il.com>,
Trond Myklebust <trondmy@...nel.org>, Anna Schumaker <anna@...nel.org>,
Dave Kleikamp <shaggy@...nel.org>, David Woodhouse <dwmw2@...radead.org>,
Richard Weinberger <richard@....at>, Jan Kara <jack@...e.cz>,
Andreas Gruenbacher <agruenba@...hat.com>,
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
Jaegeuk Kim <jaegeuk@...nel.org>
Cc: Christoph Hellwig <hch@...radead.org>, linux-nfs@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-mm@...ck.org, linux-ext4@...r.kernel.org,
linux-erofs@...ts.ozlabs.org, linux-xfs@...r.kernel.org,
ceph-devel@...r.kernel.org, linux-btrfs@...r.kernel.org,
linux-cifs@...r.kernel.org, samba-technical@...ts.samba.org,
linux-unionfs@...r.kernel.org, devel@...ts.orangefs.org,
ocfs2-devel@...ts.linux.dev, ntfs3@...ts.linux.dev,
linux-nilfs@...r.kernel.org, jfs-discussion@...ts.sourceforge.net,
linux-mtd@...ts.infradead.org, gfs2@...ts.linux.dev,
linux-f2fs-devel@...ts.sourceforge.net, Jeff Layton <jlayton@...nel.org>
Subject: [PATCH 00/29] fs: require filesystems to explicitly opt-in to nfsd
export support
In recent years, a number of filesystems that can't present stable
filehandles have grown struct export_operations. They've mostly done
this for local use-cases (enabling open_by_handle_at() and the like).
Unfortunately, having export_operations is generally sufficient to make
a filesystem be considered exportable via nfsd, but that requires that
the server present stable filehandles.
This patchset declares a new EXPORT_OP_STABLE_HANDLES flag, adds it to
all of the filesystems that have stable filehandles, and then adds a
check in nfsd to ensure that that flag is set for any filesystem to
which it has been presented a handle. When a filesystem doesn't have
this flag, it will treat the filehandle as stale.
Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
Jeff Layton (29):
exportfs: add new EXPORT_OP_STABLE_HANDLES flag
tmpfs: add EXPORT_OP_STABLE_HANDLES flag to export operations
ext4: add EXPORT_OP_STABLE_HANDLES flag to export operations
ext2: add EXPORT_OP_STABLE_HANDLES flag to export operations
erofs: add EXPORT_OP_STABLE_HANDLES flag to export operations
efs: add EXPORT_OP_STABLE_HANDLES flag to export operations
xfs: add EXPORT_OP_STABLE_HANDLES flag to export operations
ceph: add EXPORT_OP_STABLE_HANDLES flag to export operations
btrfs: add EXPORT_OP_STABLE_HANDLES flag to export operations
befs: add EXPORT_OP_STABLE_HANDLES flag to export operations
ufs: add EXPORT_OP_STABLE_HANDLES flag to export operations
udf: add EXPORT_OP_STABLE_HANDLES flag to export operations
affs: add EXPORT_OP_STABLE_HANDLES flag to export operations
squashfs: add EXPORT_OP_STABLE_HANDLES flag to export operations
smb/client: add EXPORT_OP_STABLE_HANDLES flag to export operations
ovl: add EXPORT_OP_STABLE_HANDLES flag to export operations
orangefs: add EXPORT_OP_STABLE_HANDLES flag to export operations
ocfs2: add EXPORT_OP_STABLE_HANDLES flag to export operations
ntfs3: add EXPORT_OP_STABLE_HANDLES flag to export operations
nilfs2: add EXPORT_OP_STABLE_HANDLES flag to export operations
nfs: add EXPORT_OP_STABLE_HANDLES flag to export operations
jfs: add EXPORT_OP_STABLE_HANDLES flag to export operations
jffs2: add EXPORT_OP_STABLE_HANDLES flag to export operations
isofs: add EXPORT_OP_STABLE_HANDLES flag to export operations
gfs2: add EXPORT_OP_STABLE_HANDLES flag to export operations
fuse: add EXPORT_OP_STABLE_HANDLES flag to export operations
fat: add EXPORT_OP_STABLE_HANDLES flag to export operations
f2fs: add EXPORT_OP_STABLE_HANDLES flag to export operations
nfsd: only allow filesystems that set EXPORT_OP_STABLE_HANDLES
fs/affs/namei.c | 1 +
fs/befs/linuxvfs.c | 1 +
fs/btrfs/export.c | 1 +
fs/ceph/export.c | 1 +
fs/efs/super.c | 1 +
fs/erofs/super.c | 1 +
fs/ext2/super.c | 1 +
fs/ext4/super.c | 1 +
fs/f2fs/super.c | 1 +
fs/fat/nfs.c | 2 ++
fs/fuse/inode.c | 2 ++
fs/gfs2/export.c | 1 +
fs/isofs/export.c | 1 +
fs/jffs2/super.c | 1 +
fs/jfs/super.c | 1 +
fs/nfs/export.c | 3 ++-
fs/nfsd/nfsfh.c | 4 ++++
fs/nilfs2/namei.c | 1 +
fs/ntfs3/super.c | 1 +
fs/ocfs2/export.c | 1 +
fs/orangefs/super.c | 1 +
fs/overlayfs/export.c | 2 ++
fs/smb/client/export.c | 1 +
fs/squashfs/export.c | 3 ++-
fs/udf/namei.c | 1 +
fs/ufs/super.c | 1 +
fs/xfs/xfs_export.c | 1 +
include/linux/exportfs.h | 16 +++++++++-------
mm/shmem.c | 1 +
29 files changed, 45 insertions(+), 9 deletions(-)
---
base-commit: c537e12daeecaecdcd322c56a5f70659d2de7bde
change-id: 20260114-exportfs-nfsd-12515072e9a9
Best regards,
--
Jeff Layton <jlayton@...nel.org>
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