[PATCH 0/2] NFSv4/pNFS: don't trust inode size from MDS while LAYOUTCOMMIT is outstanding

[Lucheng Bao]

When a layout requires LAYOUTCOMMIT, the size reported by the MDS may stay
stale until the commit is processed. The client already keeps i_size
from shrinking while writes are outstanding. This series extends that
protection to an outstanding LAYOUTCOMMIT.

Patch 1 rejects smaller sizes while a LAYOUTCOMMIT is pending or in
flight.

Patch 2 defers a LAYOUTRETURN whose OLD_STATEID refresh fails because a
newer segment is busy. Today that return is treated as complete and the
pending LAYOUTCOMMIT is discarded.

Without this series, a stale OPEN or CLOSE reply can lower i_size, and
the next O_APPEND write then lands at the old offset.

Lucheng Bao (2):
  NFSv4/pNFS: prevent i_size regression while layoutcommit is outstanding
  NFSv4/pNFS: defer LAYOUTRETURN after an unsuccessful OLD_STATEID refresh

 fs/nfs/inode.c    | 8 ++++++--
 fs/nfs/nfs4proc.c | 3 ++-
 2 files changed, 8 insertions(+), 3 deletions(-)

-- 
2.34.1