mm: Add a vm_special_mapping.fault() method

[mirror_ubuntu-artful-kernel.git] / mm / mmap.c

diff --git a/mm/mmap.c b/mm/mmap.c
index 2ce04a649f6b4977e54b76a29be9d5bac5e71dab..f717453b1a57c721a66be436e9ef270a156bba8d 100644 (file)
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3030,11 +3030,16 @@ static int special_mapping_fault(struct vm_area_struct *vma,
        pgoff_t pgoff;
        struct page **pages;
 
-       if (vma->vm_ops == &legacy_special_mapping_vmops)
+       if (vma->vm_ops == &legacy_special_mapping_vmops) {
                pages = vma->vm_private_data;
-       else
-               pages = ((struct vm_special_mapping *)vma->vm_private_data)->
-                       pages;
+       } else {
+               struct vm_special_mapping *sm = vma->vm_private_data;
+
+               if (sm->fault)
+                       return sm->fault(sm, vma, vmf);
+
+               pages = sm->pages;
+       }
 
        for (pgoff = vmf->pgoff; pgoff && *pages; ++pages)
                pgoff--;