function file_usage_add

Records that a module is using a file.

This usage information will be queried during file_delete() to ensure that a file is not in use before it is physically removed from disk.


  • A module that associates files with nodes, so $type would be 'node' and $id would be the node's nid. Files for all revisions are stored within a single nid.
  • The User module associates an image with a user, so $type would be 'user' and the $id would be the user's uid.


$file: A file object.

$module: The name of the module using the file.

$type: The type of the object that contains the referenced file.

$id: The unique, numeric ID of the object containing the referenced file.

$count: (optional) The number of references to add to the object. Defaults to 1.

See also



Related topics

9 calls to file_usage_add()
FileDeleteTest::testInUse in modules/simpletest/tests/file.test
Tries deleting a file that is in use.
FileUsageTest::testAddUsage in modules/simpletest/tests/file.test
Tests file_usage_add().
file_field_insert in modules/file/
Implements hook_field_insert().
file_field_update in modules/file/
Implements hook_field_update().
image_field_update_field in modules/image/image.module
Implements hook_field_update_field().

... See full list


includes/, line 713


function file_usage_add(stdClass $file, $module, $type, $id, $count = 1) {
        'fid' => $file->fid,
        'module' => $module,
        'type' => $type,
        'id' => $id,
        'count' => $count,
        ->expression('count', 'count + :count', array(
        ':count' => $count,

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