fix some bugs

src/fs/fat32.c

@@ -236,6 +236,8 @@ int fat32_write ( file_t * file, const void * buf, size_t len )
         }
     }
 
+    file_node->size = len;
+
     writeblock ( ( dir_node->cluster - 2 ) * sd_root_bst->logic_sector_per_cluster + sd_root_partition->starting_sector + sd_root_partition->root_sector_abs, dir_entrty );
 
     uart_printf ( "Write to file: %s, size: %d\n", file_node->name, len );

src/main.c

@@ -30,12 +30,14 @@ int main ( )
     vfs_read ( b, buf, 100 );
     uart_printf ( ">> %s\n", buf );
 
-    vfs_write ( b, "Hello World\n", 12 );
+    vfs_write ( b, "Hello World.\n", 12 );
+    // vfs_write ( b, "Sample text in sample file.\n", 28 );
     vfs_close ( b );
 
     b = vfs_open ( "test.txt", 0 );
     vfs_read ( b, buf, 100 );
     uart_printf ( ">> %s\n", buf );
+    vfs_close ( b );
 
     // start shell
     shell_start ( );