[PATCH v2 0/2] NFSD: use CB_GETATTR to handle GETATTR conflict with write delegation

[Dai Ngo <dai.ngo@xxxxxxxxxx>]

Currently GETATTR conflict with a write delegation is handled by
recalling the delegation before replying to the GETATTR.

This patch series add supports for CB_GETATTR callback to get the latest
change_info and size information of the file from the client that holds
the delegation to reply to the GETATTR from the second client.

v2:
  . fix kernel test robot report of missing function parameter description
    of nfsd4_deleg_getattr_conflict()