[PATCH v4 00/17] vfs: recall-only directory delegations for knfsd

[Jeff Layton <jlayton@kernel.org>]

Behold, another version of the directory delegation patchset. This
version contains support for recall-only delegations. Support for
CB_NOTIFY will be forthcoming (once the client-side patches have caught
up).

This main differences in this version are to address Christian's review
comments. I left the R-b's from Neil and Jan intact. There are some
changes to the first few patches to add support for struct
delegated_inode, but I didn't think they were significant enough to
remove the R-b lines. Let me know if that's a problem for anyone.

Thanks!
Jeff

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
Changes in v4:
- Split lease_alloc() changes into separate patch
- new patches to switch break_lease() to use single set of flags
- add struct delegated_inode and use that instead of struct inode **
- add struct createdata and use that as argument to vfs_create()
- Rebase onto brauner/vfs-6.19.directory.delegation
- Make F_GETDELEG take and fill out struct delegation too
- Link to v3: https://lore.kernel.org/r/20251021-dir-deleg-ro-v3-0-a08b1cde9f4c@kernel.org

Changes in v3:
- Fix potential nfsd_file refcount leaks on GET_DIR_DELEGATION error
- Add missing parent dir deleg break in vfs_symlink()
- Add F_SETDELEG/F_GETDELEG support to fcntl()
- Link to v2: https://lore.kernel.org/r/20251017-dir-deleg-ro-v2-0-8c8f6dd23c8b@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

---
Jeff Layton (17):
      filelock: make lease_alloc() take a flags argument
      filelock: rework the __break_lease API to use flags
      filelock: add struct delegated_inode
      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: add struct createdata for passing arguments to vfs_create()
      vfs: make vfs_create break delegations on parent directory
      vfs: make vfs_mknod break delegations on parent directory
      vfs: make vfs_symlink break delegations on parent dir
      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
      vfs: expose delegation support to userland

 drivers/base/devtmpfs.c    |   6 +-
 fs/attr.c                  |   2 +-
 fs/cachefiles/namei.c      |   2 +-
 fs/ecryptfs/inode.c        |  19 +++--
 fs/fcntl.c                 |  14 ++++
 fs/fuse/dir.c              |   1 +
 fs/init.c                  |   6 +-
 fs/locks.c                 |  97 +++++++++++++++++-------
 fs/namei.c                 | 183 +++++++++++++++++++++++++++++++++------------
 fs/nfs/nfs4file.c          |   2 +
 fs/nfsd/filecache.c        |  57 ++++++++++----
 fs/nfsd/filecache.h        |   2 +
 fs/nfsd/nfs3proc.c         |   9 ++-
 fs/nfsd/nfs4proc.c         |  22 +++++-
 fs/nfsd/nfs4recover.c      |   6 +-
 fs/nfsd/nfs4state.c        | 103 ++++++++++++++++++++++++-
 fs/nfsd/state.h            |   5 ++
 fs/nfsd/vfs.c              |  32 ++++----
 fs/nfsd/vfs.h              |   2 +-
 fs/open.c                  |  17 +++--
 fs/overlayfs/overlayfs.h   |  15 ++--
 fs/posix_acl.c             |   8 +-
 fs/smb/client/cifsfs.c     |   3 +
 fs/smb/server/vfs.c        |  15 ++--
 fs/utimes.c                |   4 +-
 fs/xattr.c                 |  12 +--
 fs/xfs/scrub/orphanage.c   |   2 +-
 include/linux/filelock.h   |  98 ++++++++++++++++++------
 include/linux/fs.h         |  33 +++++---
 include/linux/xattr.h      |   4 +-
 include/uapi/linux/fcntl.h |  10 +++
 net/unix/af_unix.c         |   2 +-
 32 files changed, 605 insertions(+), 188 deletions(-)
---
base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787
change-id: 20251013-dir-deleg-ro-d0fe19823b21

Best regards,
-- 
Jeff Layton <jlayton@kernel.org>