nfsd: set the MAY_NOTIFY_LOCK flag in OPEN replies

If we are using v4.1+, then we can send notification when contended
locks become free. Inform the client of that fact.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 6c74d9a45163..4062f4fbfc6d 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -4490,9 +4490,11 @@ out:
         * To finish the open response, we just need to set the rflags.
         */
         open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
-        if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
-            !nfsd4_has_session(&resp->cstate))
+        if (nfsd4_has_session(&resp->cstate))
+                open->op_rflags |= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK;
+        else if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED))
                 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
+
         if (dp)
                 nfs4_put_stid(&dp->dl_stid);
         if (stp)