- lower_file = sdcardfs_lower_file(file);
- /*
- * XXX: vm_ops->page_mkwrite may be called in parallel.
- * Because we have to resort to temporarily changing the
- * vma->vm_file to point to the lower file, a concurrent
- * invocation of sdcardfs_page_mkwrite could see a different
- * value. In this workaround, we keep a different copy of the
- * vma structure in our stack, so we never expose a different
- * value of the vma->vm_file called to us, even temporarily.
- * A better fix would be to change the calling semantics of
- * ->page_mkwrite to take an explicit file pointer.
- */
- lower_vma.vm_file = lower_file;
- err = lower_vm_ops->page_mkwrite(&lower_vma, vmf);