kill f_dentry uses

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index db2c967..9f8e357 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -211,7 +211,7 @@
 
 	req->r_num_caps = 1;
 	if (flags & O_CREAT)
-		parent_inode = ceph_get_dentry_parent_inode(file->f_dentry);
+		parent_inode = ceph_get_dentry_parent_inode(file->f_path.dentry);
 	err = ceph_mdsc_do_request(mdsc, parent_inode, req);
 	iput(parent_inode);
 	if (!err)