1 files changed, 4 insertions, 0 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index c29b6ed2a0b..1578d7a2667 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1588,6 +1588,10 @@ nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_sta
                 int err = get_write_access(inode);
                 if (err)
                         return nfserrno(err);
+                err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
+                if (err)
+                        return nfserrno(err);
+                file_take_write(filp);
         }
         status = nfsd4_truncate(rqstp, cur_fh, open);
         if (status) {