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-rw-r--r--mm/mmap.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 30a4e8412a58..b0093cc69240 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -137,6 +137,18 @@ void vma_set_page_prot(struct vm_area_struct *vma)
}
/*
+ * Change backing file, only valid to use during initial VMA setup.
+ */
+void vma_set_file(struct vm_area_struct *vma, struct file *file)
+{
+ /* Changing an anonymous vma with this is illegal */
+ get_file(file);
+ swap(vma->vm_file, file);
+ fput(file);
+}
+EXPORT_SYMBOL(vma_set_file);
+
+/*
* Requires inode->i_mapping->i_mmap_rwsem
*/
static void __remove_shared_vm_struct(struct vm_area_struct *vma,