Update SPT page entry to change type from EXECUTABLE to PAGE_FILE to capture mmaps in addition to executables

src/userprog/exception.c

@@ -194,7 +194,7 @@ try_fetch_page (void *upage, bool write)
   /* Load the page into memory based on the type of data it is expecting. */
   bool success = false;
   switch (page->type) {
-    case PAGE_EXECUTABLE:
+    case PAGE_FILE:
       success = page_load (page, page->writable);
       break;
     default:

src/userprog/process.c

@@ -706,7 +706,7 @@ load_segment (struct file *file, off_t ofs, uint8_t *upage,
 
       /* Add the page metadata to the SPT to be lazy loaded later on */
       if (page_insert (file, ofs, upage, page_read_bytes, page_zero_bytes,
-                       writable, PAGE_EXECUTABLE) == NULL)
+                       writable, PAGE_FILE) == NULL)
         return false;
 
       /* Advance. */

src/userprog/syscall.c

@@ -444,7 +444,7 @@ syscall_mmap (int fd, void *addr)
       off_t zero_bytes = PGSIZE - read_bytes;
 
       if (page_insert (file, ofs, addr + ofs, read_bytes, zero_bytes, true,
-                       PAGE_EXECUTABLE) == NULL)
+                       PAGE_FILE) == NULL)
         return MMAP_FAILURE;
     }
 
@@ -457,9 +457,11 @@ syscall_mmap (int fd, void *addr)
   return mmap->mapping;
 }
 
-/* Handles the syscall for unmapping a memory mapped file. */
+/* Handles the syscall for unmapping a memory mapped file.
+
+    Pre: mapping is a valid mapping identifier returned by mmap syscall.*/
 static void
-syscall_munmap (mapid_t mapping UNUSED)
+syscall_munmap (mapid_t mapping)
 {
 
 }