A smaller variation of the v1 patchset that I posted earlier this week.
Neil's review inspired me to get rid of the lm_may_setlease operation
and to do the conflict resolution internally inside of nfsd. That means
a smaller VFS-layer change, and an overall reduction in code.

This patchset adds support for directory delegations to nfsd. This
version only supports recallable delegations. There is no CB_NOTIFY
support yet. I have patches for those, but we've decided to add that
support in a later kernel once we get some experience with this part.
Anna is working on the client-side pieces.

It would be great if we could get into linux-next soon so that it can be
merged for v6.19. Christian, could you pick up the vfs/filelock patches,
and Chuck pick up the nfsd patches?

Thanks!
Jeff

[1]: https://lore.kernel.org/all/20240315-dir-deleg-v1-0-a1d6209a3654@kernel.org/ (local)

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
Changes in v2:
- handle lease conflict resolution inside of nfsd
- drop the lm_may_setlease lock_manager operation
- just add extra argument to vfs_create() instead of creating wrapper
- don't allocate fsnotify_mark for open directories
- Link to v1: https://lore.kernel.org/r/20251013-dir-deleg-ro-v1-0-406780a70e5e@kernel.org (local)

---
Jeff Layton (11):
      filelock: push the S_ISREG check down to ->setlease handlers
      vfs: add try_break_deleg calls for parents to vfs_{link,rename,unlink}
      vfs: allow mkdir to wait for delegation break on parent
      vfs: allow rmdir to wait for delegation break on parent
      vfs: break parent dir delegations in open(..., O_CREAT) codepath
      vfs: make vfs_create break delegations on parent directory
      vfs: make vfs_mknod break delegations on parent directory
      filelock: lift the ban on directory leases in generic_setlease
      nfsd: allow filecache to hold S_IFDIR files
      nfsd: allow DELEGRETURN on directories
      nfsd: wire up GET_DIR_DELEGATION handling

 drivers/base/devtmpfs.c  |   6 +--
 fs/cachefiles/namei.c    |   2 +-
 fs/ecryptfs/inode.c      |   8 +--
 fs/fuse/dir.c            |   1 +
 fs/init.c                |   4 +-
 fs/locks.c               |  12 +++--
 fs/namei.c               | 134 ++++++++++++++++++++++++++++++++++++-----------
 fs/nfs/nfs4file.c        |   2 +
 fs/nfsd/filecache.c      |  57 +++++++++++++++-----
 fs/nfsd/filecache.h      |   2 +
 fs/nfsd/nfs3proc.c       |   2 +-
 fs/nfsd/nfs4proc.c       |  21 +++++++-
 fs/nfsd/nfs4recover.c    |   6 +--
 fs/nfsd/nfs4state.c      | 103 +++++++++++++++++++++++++++++++++++-
 fs/nfsd/state.h          |   5 ++
 fs/nfsd/vfs.c            |  14 ++---
 fs/nfsd/vfs.h            |   2 +-
 fs/open.c                |   2 +-
 fs/overlayfs/overlayfs.h |   8 +--
 fs/smb/client/cifsfs.c   |   3 ++
 fs/smb/server/vfs.c      |   8 +--
 fs/xfs/scrub/orphanage.c |   2 +-
 include/linux/fs.h       |  11 ++--
 net/unix/af_unix.c       |   2 +-
 24 files changed, 329 insertions(+), 88 deletions(-)
---
base-commit: 2c40814eb5ae104d3f898fd8b705ecad114105b5
change-id: 20251013-dir-deleg-ro-d0fe19823b21

Best regards,
-- 
Jeff Layton [off-list ref]