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  if (db_table_exists('block') && $deltas) {

/**

 * Implements hook_update_dependencies().

 */

function panels_mini_update_dependencies() {

  // Update 7301 requires panels storage support

  $dependencies['panels_mini'][7301] = array(

    'panels' => 7305,

  );

  return $dependencies;

}

/**

 * Set the storage type and id on existing mini panels.

 */

function panels_mini_update_7301() {

  if (!isset($sandbox['progress'])) {

     // Initialize batch update information.

     $sandbox['progress'] = (float)0;

     $sandbox['current_did'] = -1;

     $sandbox['max'] = db_query("SELECT COUNT(pd.did)

         FROM {panels_display} pd

           JOIN {panels_mini} pm ON pm.did = pd.did

         WHERE pd.storage_type = ''")->fetchField();

   }

  // Set a limit of how many rows to process per batch.

  $limit = 1000;

  // Run the query

  $result = db_query_range("SELECT pd.did, pm.name

      FROM {panels_display} pd

        JOIN {panels_mini} pm ON pm.did = pd.did

      WHERE pd.storage_type = '' AND pd.did > :current_did", 0, $limit, array(':current_did' => $sandbox['current_did']));

  foreach ($result as $row) {

    db_update('panels_display')

      ->fields(array(

        'storage_type' => 'panels_mini',

        'storage_id' => $row->name,

      ))

      ->condition('did', $row->did)

      ->execute();

    // Update our progress information.

    $sandbox['progress']++;

    $sandbox['current_did'] = $row->did;

  }

  // Set the "finished" status, to tell batch engine whether this function

  // needs to run again.

  $sandbox['#finished'] = ($sandbox['progress'] >= $sandbox['max']) ? TRUE : ($sandbox['progress'] / $sandbox['max']);

  if ($sandbox['#finished']) {

    return t('Added the storage type for panels_mini to relevant panels displays');

  }

}