diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index e818344a052c..e6bf3cd8fae0 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -354,6 +354,11 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
 	err = ceph_init_dentry(dentry);
 	if (err < 0)
 		return err;
+	/*
+	 * Do not truncate the file, since atomic_open is called before the
+	 * permission check. The caller will do the truncation afterward.
+	 */
+	flags &= ~O_TRUNC;
 
 	if (flags & O_CREAT) {
 		err = ceph_pre_init_acls(dir, &mode, &acls);
@@ -384,9 +389,7 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
        req->r_args.open.mask = cpu_to_le32(mask);
 
 	req->r_locked_dir = dir;           /* caller holds dir->i_mutex */
-	err = ceph_mdsc_do_request(mdsc,
-				   (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
-				   req);
+	err = ceph_mdsc_do_request(mdsc, (flags & O_CREAT) ? dir : NULL, req);
 	err = ceph_handle_snapdir(req, dentry, err);
 	if (err)
 		goto out_req;