Merge patch series "vfs: require filesystems to explicitly opt-in to lease support"

Jeff Layton <jlayton@kernel.org> says:

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:

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.

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 lease
support, particularly with the advent of directory delegations.

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 not
set.

With this change, new filesystems will need to explicitly set the
->setlease() operations in order to provide lease and delegation
support.

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.

[1]: https://lore.kernel.org/linux-fsdevel/20260107-setlease-6-19-v1-0-85f034abcc57@kernel.org/

* patches from https://patch.msgid.link/20260108-setlease-6-20-v1-0-ea4dec9b67fa@kernel.org: (24 commits)
  fs: remove simple_nosetlease()
  filelock: default to returning -EINVAL when ->setlease operation is NULL
  xfs: add setlease file operation
  ufs: add setlease file operation
  udf: add setlease file operation
  tmpfs: add setlease file operation
  squashfs: add setlease file operation
  overlayfs: add setlease file operation
  orangefs: add setlease file operation
  ocfs2: add setlease file operation
  ntfs3: add setlease file operation
  nilfs2: add setlease file operation
  jfs: add setlease file operation
  jffs2: add setlease file operation
  gfs2: add a setlease file operation
  fat: add setlease file operation
  f2fs: add setlease file operation
  exfat: add setlease file operation
  ext4: add setlease file operation
  ext2: add setlease file operation
  ...

Link: https://patch.msgid.link/20260108-setlease-6-20-v1-0-ea4dec9b67fa@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>