Added a possibility to enable mmap files for reads and writes

src/db_options.rs

@@ -1158,6 +1158,42 @@ impl Options {
             ffi::rocksdb_options_set_keep_log_file_num(self.inner, nfiles);
         }
     }
+
+    /// Allow the OS to mmap file for writing.
+    ///
+    /// Default: false
+    ///
+    /// # Example
+    ///
+    /// ```
+    /// use rocksdb::Options;
+    ///
+    /// let mut options = Options::default();
+    /// options.set_allow_mmap_writes(true);
+    /// ```
+    pub fn set_allow_mmap_writes(&mut self, is_enabled: bool) {
+        unsafe {
+            ffi::rocksdb_options_set_allow_mmap_writes(self.inner, is_enabled as c_uchar);
+        }
+    }
+
+    /// Allow the OS to mmap file for reading sst tables.
+    ///
+    /// Default: false
+    ///
+    /// # Example
+    ///
+    /// ```
+    /// use rocksdb::Options;
+    ///
+    /// let mut options = Options::default();
+    /// options.set_allow_mmap_reads(true);
+    /// ```
+    pub fn set_allow_mmap_reads(&mut self, is_enabled: bool) {
+        unsafe {
+            ffi::rocksdb_options_set_allow_mmap_reads(self.inner, is_enabled as c_uchar);
+        }
+    }
 }
 
 impl Default for Options {