1 files changed, 41 insertions, 0 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 8aeedeb784c2..d0dfc85b209b 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -131,6 +131,47 @@ void unlink_file_vma(struct vm_area_struct *vma)
 	}
 }
 
+void unlink_file_vma_batch_init(struct unlink_vma_file_batch *vb)
+{
+	vb->count = 0;
+}
+
+static void unlink_file_vma_batch_process(struct unlink_vma_file_batch *vb)
+{
+	struct address_space *mapping;
+	int i;
+
+	mapping = vb->vmas[0]->vm_file->f_mapping;
+	i_mmap_lock_write(mapping);
+	for (i = 0; i < vb->count; i++) {
+		VM_WARN_ON_ONCE(vb->vmas[i]->vm_file->f_mapping != mapping);
+		__remove_shared_vm_struct(vb->vmas[i], mapping);
+	}
+	i_mmap_unlock_write(mapping);
+
+	unlink_file_vma_batch_init(vb);
+}
+
+void unlink_file_vma_batch_add(struct unlink_vma_file_batch *vb,
+			       struct vm_area_struct *vma)
+{
+	if (vma->vm_file == NULL)
+		return;
+
+	if ((vb->count > 0 && vb->vmas[0]->vm_file != vma->vm_file) ||
+	    vb->count == ARRAY_SIZE(vb->vmas))
+		unlink_file_vma_batch_process(vb);
+
+	vb->vmas[vb->count] = vma;
+	vb->count++;
+}
+
+void unlink_file_vma_batch_final(struct unlink_vma_file_batch *vb)
+{
+	if (vb->count > 0)
+		unlink_file_vma_batch_process(vb);
+}
+
 /*
  * Close a vm structure and free it.
  */