[PATCH v2 0/5] nfsd: more delegated timestamp fixes

[Jeff Layton]

Chuck recently added a new DELEG27 pynfs test that fails against nfsd.
These patches fix the behavior of delegated timestamps (again), such
that DELEG27 now passes.

I also ran some tests with the git regression testsuite which turns out
to be very sensitive to timestamp bugs, and that turned up a few more
server-side bugs.

Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
Changes in v2:
- "Honor delegated timestamps when change and size match" reworked:
  - set ATTR_FORCE when applying the holder's times
  - record applied times in dl_[amc]time; vet and record under inode_lock
  - vet SETATTR's delegated times in nfsd_setattr() under inode_lock
  - also mark file modified on a holder WRITE whose mtime didn't pass dl_mtime
  - always report ncf_initial_cinfo as the change attr for timestamp delegations
  - catch the holder's own server-side changes (SETATTR, xattrs, etc.)
    via a change attribute saved at grant
  - log, rather than fail the GETATTR, if applying the holder's times fails
- New: don't stamp over an applied delegated mtime at DELEGRETURN
- New: don't vet delegated times against an exclusive-create verifier
- New: mark the delegation written on COPY/CLONE instead of stamping c/mtime
- Link to v1: https://lore.kernel.org/r/20261102-deleg-cb-getattr-times-v1-0-ca0326d88623@xxxxxxxxxx

---
Jeff Layton (5):
      nfsd: Report vetted delegated timestamps in GETATTR replies
      nfsd: Honor delegated timestamps when change and size match
      nfsd: don't stamp over an applied delegated mtime at DELEGRETURN
      nfsd: don't vet delegated times against an exclusive-create verifier
      nfsd: mark the delegation written on COPY/CLONE instead of stamping c/mtime

 fs/nfsd/nfs4proc.c  |  98 ++++++++++++++---------------
 fs/nfsd/nfs4state.c | 173 +++++++++++++++++++++++++++++++++++++++++++++-------
 fs/nfsd/nfs4xdr.c   |  10 +--
 fs/nfsd/state.h     |   5 +-
 fs/nfsd/vfs.c       |   4 ++
 fs/nfsd/vfs.h       |  13 ++++
 fs/nfsd/xdr4.h      |   9 ++-
 7 files changed, 229 insertions(+), 83 deletions(-)
---
base-commit: d692f252c52b8d1b4bc7481554f314df31ed8249
change-id: 20261102-deleg-cb-getattr-times-8aa926029b16

Best regards,
-- 
Jeff Layton <jlayton@xxxxxxxxxx>