diff --git a/mongodb_cache/mongodb_cache.inc b/mongodb_cache/mongodb_cache.inc
new file mode 100644
index 0000000..97d01a2
--- /dev/null
+++ b/mongodb_cache/mongodb_cache.inc
@@ -0,0 +1,238 @@
+<?php
+
+include_once dirname(__FILE__) . '/../mongodb.module';
+
+/**
+ * Backported from Drupal 7 ===========================================
+ */
+
+/**
+ * Get the cache object for a cache bin.
+ */
+function mongodb_cache_get_object($bin) {
+  static $cache_objects;
+  if (!isset($cache_objects[$bin])) {
+    $cache_objects[$bin] = new DrupalMongoDBCache($bin);
+  }
+  return $cache_objects[$bin];
+}
+
+/**
+ * Return data from the persistent cache
+ */
+function cache_get($cid, $bin = 'cache') {
+  return mongodb_cache_get_object($bin)->get($cid);
+}
+
+/**
+ * Store data in the persistent cache.
+ */
+function cache_set($cid, $data, $bin = 'cache', $expire = CACHE_PERMANENT, $headers = NULL) {
+  return mongodb_cache_get_object($bin)->set($cid, $data, $expire, $headers);
+}
+
+/**
+ * Expire data from the cache.
+ */
+function cache_clear_all($cid = NULL, $bin = NULL, $wildcard = FALSE) {
+  if (!isset($cid) && !isset($bin)) {
+    // Clear the block cache first, so stale data will
+    // not end up in the page cache.
+    if (module_exists('block')) {
+      cache_clear_all(NULL, 'cache_block');
+    }
+    cache_clear_all(NULL, 'cache_page');
+    return;
+  }
+  return mongodb_cache_get_object($bin)->clear($cid, $wildcard);
+}
+
+/**
+ * MonogoDB cache implementation.
+ *
+ * This is Drupal's default cache implementation. It uses the MongoDB to store
+ * cached data. Each cache bin corresponds to a collection by the same name.
+ */
+class DrupalMongoDBCache {
+  protected $bin;
+
+  function __construct($bin) {
+    $this->bin = $bin;
+  }
+
+  function get($cid) {
+    $collection = mongodb_collection($this->bin);
+    // Garbage collection necessary when enforcing a minimum cache lifetime.
+    $this->garbageCollection($this->bin);
+    $cache = $collection->findOne(array('_id' => (string)$cid));
+    return $this->prepareItem($cache);
+  }
+
+  function getMultiple(&$cids) {
+    $collection = mongodb_collection($this->bin);
+    // Garbage collection necessary when enforcing a minimum cache lifetime.
+    $this->garbageCollection($this->bin);
+    $find = array();
+    $find['_id']['$in'] = array_map('strval', $cids);
+    $result = $collection->find($find);
+    $cache = array();
+    foreach ($result as $item) {
+      $item = $this->prepareItem($item);
+      if ($item) {
+        $cache[$item->cid] = $item;
+      }
+    }
+    $cids = array_diff($cids, array_keys($cache));
+    return $cache;
+  }
+
+  /**
+   * Garbage collection for get() and getMultiple().
+   *
+   * @param $bin
+   *   The bin being requested.
+   */
+  protected function garbageCollection() {
+    global $user;
+    $collection = mongodb_collection($this->bin);
+
+    // Garbage collection necessary when enforcing a minimum cache lifetime.
+    $cache_flush = variable_get('cache_flush_' . $this->bin, 0);
+    if ($cache_flush && ($cache_flush + variable_get('cache_lifetime', 0) <= $_SERVER['REQUEST_TIME'])) {
+      // Reset the variable immediately to prevent a meltdown in heavy load situations.
+      variable_set('cache_flush_' . $this->bin, 0);
+      // Time to flush old cache data
+      $find = array('expire' => array('$lte' => $cache_flush, '$ne' => CACHE_PERMANENT));
+      $collection->remove($find);
+    }
+  }
+
+  /**
+   * Prepare a cached item.
+   *
+   * Checks that items are either permanent or did not expire, and unserializes
+   * data as appropriate.
+   *
+   * @param $cache
+   *   An item loaded from cache_get() or cache_get_multiple().
+   * @return
+   *   The item with data unserialized as appropriate or FALSE if there is no
+   *   valid item to load.
+   */
+  protected function prepareItem($cache) {
+    global $user;
+
+    if (!$cache || !isset($cache['data'])) {
+      return FALSE;
+    }
+    unset($cache['_id']);
+    $cache = (object)$cache;
+    // If the data is permanent or we are not enforcing a minimum cache lifetime
+    // always return the cached data.
+    // ?
+    if ($cache->expire == CACHE_PERMANENT || !variable_get('cache_lifetime', 0)) {
+    }
+    // If enforcing a minimum cache lifetime, validate that the data is
+    // currently valid for this user before we return it by making sure the cache
+    // entry was created before the timestamp in the current session's cache
+    // timer. The cache variable is loaded into the $user object by _drupal_session_read()
+    // in session.inc. If the data is permanent or we're not enforcing a minimum
+    // cache lifetime always return the cached data.
+    if ($cache->expire != CACHE_PERMANENT && variable_get('cache_lifetime', 0) && $user->cache > $cache->created) {
+      // This cache data is too old and thus not valid for us, ignore it.
+      return FALSE;
+    }
+    if ($cache->data instanceof MongoBinData) {
+      $cache->data = $cache->data->bin;
+    }
+    if ($cache->serialized) {
+      $cache->data = unserialize($cache->data);
+    }
+
+    return $cache;
+  }
+
+  function set($cid, $data, $expire = CACHE_PERMANENT, $headers = NULL) {
+    $scalar = is_scalar($data);
+    $entry = array(
+      '_id' => (string)$cid,
+      'cid' => (string)$cid,
+      'created' => $_SERVER['REQUEST_TIME'],
+      'expire' => $expire,
+      'headers' => $headers,
+      'serialized' => !$scalar,
+      'data' => $scalar ? $data : serialize($data),
+    );
+
+    // Use MongoBinData for non-UTF8 strings.
+    if (is_string($entry['data']) && !drupal_validate_utf8($entry['data'])) {
+      $entry['data'] = new MongoBinData($entry['data']);
+    }
+
+    try {
+      $collection = mongodb_collection($this->bin);
+      $collection->save($entry);
+    }
+    catch (Exception $e) {
+      // The database may not be available, so we'll ignore cache_set requests.
+    }
+  }
+
+  function clear($cid = NULL, $wildcard = FALSE) {
+    global $user;
+
+    $collection = mongodb_collection($this->bin);
+
+    if (empty($cid)) {
+      if (variable_get('cache_lifetime', 0)) {
+        // We store the time in the current user's $user->cache variable which
+        // will be saved into the sessions bin by _drupal_session_write(). We then
+        // simulate that the cache was flushed for this user by not returning
+        // cached data that was cached before the timestamp.
+        $user->cache = $_SERVER['REQUEST_TIME'];
+
+        $cache_flush = variable_get('cache_flush_' . $this->bin, 0);
+        if ($cache_flush == 0) {
+          // This is the first request to clear the cache, start a timer.
+          variable_set('cache_flush_' . $this->bin, $_SERVER['REQUEST_TIME']);
+        }
+        elseif ($_SERVER['REQUEST_TIME'] > ($cache_flush + variable_get('cache_lifetime', 0))) {
+          // Clear the cache for everyone, cache_lifetime seconds have
+          // passed since the first request to clear the cache.
+
+          $collection->remove(array('expire' => array('$ne' => CACHE_PERMANENT, '$lte' => $_SERVER['REQUEST_TIME'])));
+          variable_set('cache_flush_' . $this->bin, 0);
+        }
+      }
+      else {
+        // No minimum cache lifetime, flush all temporary cache entries now.
+        $collection->remove(array('expire' => array('$ne' => CACHE_PERMANENT, '$lte' => $_SERVER['REQUEST_TIME'])));
+      }
+    }
+    else {
+      if ($wildcard) {
+        if ($cid == '*') {
+          $collection->remove();
+        }
+        else {
+          $collection->remove(array('cid' => new MongoRegex('/'. preg_quote($cid) .'.*/')));
+        }
+      }
+      elseif (is_array($cid)) {
+        // Delete in chunks when a large array is passed.
+        do {
+          $find = array('cid' => array('$in' => array_map('strval', array_splice($cid, 0, 1000))));
+          $collection->remove($find);
+        }
+        while (count($cid));
+      }
+      else {
+        $collection->remove(array('_id' => (string)$cid));
+      }
+    }
+  }
+
+  function isEmpty() {
+    return !mongodb_collection($this->bin)->findOne();
+  }
+}
diff --git a/mongodb_cache/mongodb_cache.info b/mongodb_cache/mongodb_cache.info
new file mode 100644
index 0000000..74903a3
--- /dev/null
+++ b/mongodb_cache/mongodb_cache.info
@@ -0,0 +1,5 @@
+name = MongoDB Cache
+description = Store cache in MongoDB.
+package = MongoDB
+core = 6.x
+dependencies[] = mongodb
diff --git a/mongodb_cache/mongodb_cache.module b/mongodb_cache/mongodb_cache.module
new file mode 100644
index 0000000..b3d9bbc
--- /dev/null
+++ b/mongodb_cache/mongodb_cache.module
@@ -0,0 +1 @@
+<?php