1 files changed, 4 insertions, 1 deletions

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 6e50aaa56ca2..c165a6403df0 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -998,8 +998,11 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
 
         if (!EX_ISSYNC(exp))
                 stable = 0;
-        if (stable && !EX_WGATHER(exp))
+        if (stable && !EX_WGATHER(exp)) {
+                spin_lock(&file->f_lock);
                 file->f_flags |= O_SYNC;
+                spin_unlock(&file->f_lock);
+        }
 
         /* Write the data. */
         oldfs = get_fs(); set_fs(KERNEL_DS);