Re: [PATCH v3 00/13] vfs: recall-only directory delegations for knfsd

[Christian Brauner <brauner@kernel.org>]

On Tue, Oct 21, 2025 at 11:25:35AM -0400, Jeff Layton wrote:
> Behold, another version of directory delegations. 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 bugfixes, but the last patch
> adds a more formal API for userland to request a delegation. That
> support is optional. We can drop it and the rest of the series should be
> fine.
> 
> My main interest in making delegations available to userland is to allow
> testing this support without nfsd. I have an xfstest ready to submit for
> this if that support looks acceptable. If it is, then I'll also plan to
> submit an update for fcntl(2).
> 
> Christian, Chuck mentioned he was fine with you merging the nfsd bits
> too, if you're willing to take the whole pile.

This all looks good to me btw. The only thing I'm having issues with is:

 Base: base-commit d2ced3cadfab04c7e915adf0a73c53fcf1642719 not known, ignoring
 Base: attempting to guess base-commit...
 Base: tags/v6.18-rc1-23-g2c09630d09c6 (best guess, 21/27 blobs matched)
 Base: v6.18-rc1
Magic: Preparing a sparse worktree
Unable to cleanly apply series, see failure log below
---
Applying: filelock: push the S_ISREG check down to ->setlease handlers
Applying: vfs: add try_break_deleg calls for parents to vfs_{link,rename,unlink}
Applying: vfs: allow mkdir to wait for delegation break on parent
Applying: vfs: allow rmdir to wait for delegation break on parent
Patch failed at 0004 vfs: allow rmdir to wait for delegation break on parent
error: invalid object 100644 423dd102b51198ea7c447be2b9a0a5020c950dba for 'fs/nfsd/nfs4recover.c'
error: Repository lacks necessary blobs to fall back on 3-way merge.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config advice.mergeConflict false"

That commit isn't in -next nor in any of my branches?
Can you resend on top of: vfs-6.19.directory.delegations please?

> 
> Thanks!
> Jeff
> 
> Signed-off-by: Jeff Layton <jlayton@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 (13):
>       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
>       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/cachefiles/namei.c      |   2 +-
>  fs/ecryptfs/inode.c        |  10 +--
>  fs/fcntl.c                 |   9 +++
>  fs/fuse/dir.c              |   1 +
>  fs/init.c                  |   6 +-
>  fs/locks.c                 |  68 +++++++++++++++-----
>  fs/namei.c                 | 150 +++++++++++++++++++++++++++++++++++----------
>  fs/nfs/nfs4file.c          |   2 +
>  fs/nfsd/filecache.c        |  57 ++++++++++++-----
>  fs/nfsd/filecache.h        |   2 +
>  fs/nfsd/nfs3proc.c         |   2 +-
>  fs/nfsd/nfs4proc.c         |  22 ++++++-
>  fs/nfsd/nfs4recover.c      |   6 +-
>  fs/nfsd/nfs4state.c        | 103 ++++++++++++++++++++++++++++++-
>  fs/nfsd/state.h            |   5 ++
>  fs/nfsd/vfs.c              |  16 ++---
>  fs/nfsd/vfs.h              |   2 +-
>  fs/open.c                  |   2 +-
>  fs/overlayfs/overlayfs.h   |  10 +--
>  fs/smb/client/cifsfs.c     |   3 +
>  fs/smb/server/vfs.c        |   8 +--
>  fs/xfs/scrub/orphanage.c   |   2 +-
>  include/linux/filelock.h   |  12 ++++
>  include/linux/fs.h         |  13 ++--
>  include/uapi/linux/fcntl.h |  10 +++
>  net/unix/af_unix.c         |   2 +-
>  27 files changed, 425 insertions(+), 106 deletions(-)
> ---
> base-commit: d2ced3cadfab04c7e915adf0a73c53fcf1642719
> change-id: 20251013-dir-deleg-ro-d0fe19823b21
> 
> Best regards,
> -- 
> Jeff Layton <jlayton@kernel.org>
>