diff --git a/src/vm/mmap.c b/src/vm/mmap.c
index 3d6bd79..528c597 100644
--- a/src/vm/mmap.c
+++ b/src/vm/mmap.c
@@ -15,6 +15,21 @@ mmap_init (struct thread *t)
   return hash_init (&t->mmap_files, mmap_hash, mmap_less, NULL);
 }
 
+struct mmap_entry *
+mmap_get (mapid_t mapping)
+{
+  struct mmap_entry fake_mmap_entry;
+  fake_mmap_entry.mapping = mapping;
+
+  struct hash_elem *e
+    = hash_find (&thread_current ()->mmap_files, &fake_mmap_entry.elem);
+
+  if (e == NULL)
+    return NULL;
+
+  return hash_entry (e, struct mmap_entry, elem);
+}
+
 /* Inserts a new mmap entry into the mmap table for the current thread. Upage
    is the start address of the file data in the user VM. */
 struct mmap_entry *
diff --git a/src/vm/mmap.h b/src/vm/mmap.h
index a64210a..5f7143b 100644
--- a/src/vm/mmap.h
+++ b/src/vm/mmap.h
@@ -18,6 +18,7 @@ struct mmap_entry {
 };
 
 bool mmap_init (struct thread *t);
+struct mmap_entry *mmap_get (mapid_t mapping);
 struct mmap_entry *mmap_insert (struct file *file, void *upage);
 void mmap_destroy (void);