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[100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 2E663432EB; Thu, 8 Jan 2026 18:57:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 60A8BC116C6; Thu, 8 Jan 2026 18:56:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767898626; bh=5he/mWk942UgyMcVrvD6SAu+dsdYI4IY/ZKYEV0nd4I=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=IVcj/Up5pUIL/21UD3vdFo7LG1nsqJG0y8MII2rX7fuh3iO8eqoctQChr69A/z58g 5KgbF1X8xV00o46rmPIbcqIZEIF8erkf826KYZ1ZoGs2hcwFRvz9oiVBU92gbAhzyA 0r+l6Mt1vxiLBuRQjFSLEctLEhTBADuTECQiBZ+9gqw+8u7gUFlUKFPJqHkbOoasko I2D7VrQn9/cdA7UghgaIjR2YaPHOE3ivbWn4hGdWJmaH9cka4Cx7gfyO6gbb1+SzsA TSEp5Wq9R6HWJ/Dy8pXZUMSYMMQX7UKyEKZOf6GGsWFZtBY90ZvwFFESq3Sx7W68cd 7b0wtGXIJLNHQ== Message-ID: <8af369636c32b868f83669c49aea708ca3b894ac.camel@kernel.org> Subject: Re: [PATCH 00/24] vfs: require filesystems to explicitly opt-in to lease support From: Jeff Layton To: Jan Kara Cc: Luis de Bethencourt , Salah Triki , Nicolas Pitre , Christoph Hellwig , Anders Larsen , Alexander Viro , Christian Brauner , 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 , Amir Goldstein , Phillip Lougher , Carlos Maiolino , Hugh Dickins , Baolin Wang , Andrew Morton , Namjae Jeon , Sungjong Seo , Yuezhang Mo , Chuck Lever , 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: Thu, 08 Jan 2026 13:56:57 -0500 In-Reply-To: References: <20260108-setlease-6-20-v1-0-ea4dec9b67fa@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv 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rspam01 X-Rspamd-Queue-Id: 8111B40010 X-Stat-Signature: mqquq43w4o5brkyxjq3pukebiw6jhkzx X-HE-Tag: 1767898627-568416 X-HE-Meta: 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H1URU5lH1i6kA6tx11zIFLP3sk19Tzh5SuCfsspzoSa6nOaxghMy8yQtzGeMWBh25MwlM1AKUalS2h6s0sc0O6kN/ZQwf+TQpSBqsYeXgVrAnoshfvKmX73kln6MUT1lCLMBOiYcUPpIlJrP1kiHCP0PMVD5cSsqcrCUWGi+aT6Rob2aQBMhCjrksyCz58sx0fOEV/jfyHYCAfsSiyfvqKmf/z4oHODkKcZM/PtffUY5+ZygcvMhMFypsntQ9dUhmD8Q+Jddja6d7tnI3fle006Ao0oFDfK8ygYQOMRhHc9k6jrIE13pHMaIZNw== 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, 2026-01-08 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 support is > > handled on filesystems where the should be disabled [1]. That set is > > appropriate for v6.19. For v7.0, I want to make lease support be 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 equivalent. > >=20 > > This has caused a number of problems over the years as some filesystems > > have inadvertantly allowed leases to be acquired simply by having left > > it set to NULL. It would be better if filesystems had to opt-in to leas= e > > support, particularly with the advent of directory delegations. > >=20 > > This series has sets the ->setlease() operation in a pile of existing > > local filesystems to generic_setlease() and then changes > > kernel_setlease() to return -EINVAL when the setlease() operation is no= t > > set. > >=20 > > With this change, new filesystems will need to explicitly set the > > ->setlease() operations in order to provide lease and delegation > > 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 exportin= g > > 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 don't have > .setlease set... >=20 Yes, FUSE needs this too. I'll add a patch for that. As far as kernfs goes: AIUI, that's basically what sysfs and resctrl are built on. Do we really expect people to set leases there? I guess it's technically a regression since you could set them on those sorts of files earlier, but people don't usually export kernfs based filesystems via NFS or SMB, and that seems like something that could be used to make mischief. AFAICT, kernfs_export_ops is mostly to support open_by_handle_at(). See commit aa8188253474 ("kernfs: add exportfs operations"). 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 might get some reports that would tell us who's setting leases on these files and why. Thanks for the review! > >=20 > > [1]: https://lore.kernel.org/linux-fsdevel/20260107-setlease-6-19-v1-0-= 85f034abcc57@kernel.org/ > >=20 > > Signed-off-by: Jeff Layton > > --- > > Jeff Layton (24): > > fs: add setlease to generic_ro_fops and read-only filesystem dire= ctory operations > > affs: add setlease file operation > > btrfs: add setlease file operation > > erofs: add setlease file operation > > ext2: add setlease file operation > > ext4: add setlease file operation > > exfat: add setlease file operation > > f2fs: add setlease file operation > > fat: add setlease file operation > > gfs2: add a setlease file operation > > jffs2: add setlease file operation > > jfs: add setlease file operation > > nilfs2: add setlease file operation > > ntfs3: add setlease file operation > > ocfs2: add setlease file operation > > orangefs: add setlease file operation > > overlayfs: add setlease file operation > > squashfs: add setlease file operation > > tmpfs: add setlease file operation > > udf: add setlease file operation > > ufs: add setlease file operation > > xfs: add setlease file operation > > filelock: default to returning -EINVAL when ->setlease operation = is NULL > > fs: remove simple_nosetlease() > >=20 > > Documentation/filesystems/porting.rst | 9 +++++++++ > > Documentation/filesystems/vfs.rst | 9 ++++++--- > > fs/9p/vfs_dir.c | 2 -- > > fs/9p/vfs_file.c | 2 -- > > fs/affs/dir.c | 2 ++ > > fs/affs/file.c | 2 ++ > > fs/befs/linuxvfs.c | 2 ++ > > fs/btrfs/file.c | 2 ++ > > fs/btrfs/inode.c | 2 ++ > > fs/ceph/dir.c | 2 -- > > fs/ceph/file.c | 1 - > > fs/cramfs/inode.c | 2 ++ > > fs/efs/dir.c | 2 ++ > > fs/erofs/data.c | 2 ++ > > fs/erofs/dir.c | 2 ++ > > fs/exfat/dir.c | 2 ++ > > fs/exfat/file.c | 2 ++ > > fs/ext2/dir.c | 2 ++ > > fs/ext2/file.c | 2 ++ > > fs/ext4/dir.c | 2 ++ > > fs/ext4/file.c | 2 ++ > > fs/f2fs/dir.c | 2 ++ > > fs/f2fs/file.c | 2 ++ > > fs/fat/dir.c | 2 ++ > > fs/fat/file.c | 2 ++ > > fs/freevxfs/vxfs_lookup.c | 2 ++ > > fs/fuse/dir.c | 1 - > > fs/gfs2/file.c | 3 +-- > > fs/isofs/dir.c | 2 ++ > > fs/jffs2/dir.c | 2 ++ > > fs/jffs2/file.c | 2 ++ > > fs/jfs/file.c | 2 ++ > > fs/jfs/namei.c | 2 ++ > > fs/libfs.c | 20 ++------------------ > > fs/locks.c | 3 +-- > > fs/nfs/dir.c | 1 - > > fs/nfs/file.c | 1 - > > fs/nilfs2/dir.c | 3 ++- > > fs/nilfs2/file.c | 2 ++ > > fs/ntfs3/dir.c | 3 +++ > > fs/ntfs3/file.c | 3 +++ > > fs/ocfs2/file.c | 5 +++++ > > fs/orangefs/dir.c | 4 +++- > > fs/orangefs/file.c | 1 + > > fs/overlayfs/file.c | 2 ++ > > fs/overlayfs/readdir.c | 2 ++ > > fs/qnx4/dir.c | 2 ++ > > fs/qnx6/dir.c | 2 ++ > > fs/read_write.c | 2 ++ > > fs/smb/client/cifsfs.c | 1 - > > fs/squashfs/dir.c | 2 ++ > > fs/squashfs/file.c | 4 +++- > > fs/udf/dir.c | 2 ++ > > fs/udf/file.c | 2 ++ > > fs/ufs/dir.c | 2 ++ > > fs/ufs/file.c | 2 ++ > > fs/vboxsf/dir.c | 1 - > > fs/vboxsf/file.c | 1 - > > fs/xfs/xfs_file.c | 3 +++ > > include/linux/fs.h | 1 - > > mm/shmem.c | 2 ++ > > 61 files changed, 116 insertions(+), 42 deletions(-) > > --- > > base-commit: 731ce71a6c8adb8b8f873643beacaeedc1564500 > > change-id: 20260107-setlease-6-20-299eb5695c5a > >=20 > > Best regards, > > --=20 > > Jeff Layton > >=20 --=20 Jeff Layton