[PATCH 6.18 620/752] NFSD: fix setting FMODE_NOCMTIME in nfs4_open_delegation

Sasha Levin
2026-02-28T17:57:09Z

From: Olga Kornievskaia <okorniev@redhat.com>

[ Upstream commit 41b0a87bc60d5ccfa8575481ddb4d4d8758507fa ]

fstests generic/215 and generic/407 were failing because the server
wasn't updating mtime properly. When deleg attribute support is not
compiled in and thus no attribute delegation was given, the server
was skipping updating mtime and ctime because FMODE_NOCMTIME was
uncoditionally set for the write delegation.

Fixes: e5e9b24ab8fa ("nfsd: freeze c/mtime updates with outstanding WRITE_ATTRS delegation")
Cc: stable@vger.kernel.org
Signed-off-by: Olga Kornievskaia <okorniev@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/nfsd/nfs4state.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 740c40eb5b366..c5dba49c90356 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -6356,7 +6356,8 @@ nfs4_open_delegation(struct svc_rqst *rqstp, struct nfsd4_open *open,
dp->dl_ctime = stat.ctime;
dp->dl_mtime = stat.mtime;
spin_lock(&f->f_lock);
- f->f_mode |= FMODE_NOCMTIME;
+ if (deleg_ts)
+ f->f_mode |= FMODE_NOCMTIME;
spin_unlock(&f->f_lock);
trace_nfsd_deleg_write(&dp->dl_stid.sc_stateid);
} else {
--
2.51.0