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diff --git a/modules/cache/cache_disk_common.h b/modules/cache/cache_disk_common.h
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+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file cache_disk_common.h
+ * @brief Common Disk Cache vars/structs
+ *
+ * @defgroup Cache_cache  Cache Functions
+ * @ingroup  MOD_DISK_CACHE
+ * @{
+ */
+
+#ifndef CACHE_DIST_COMMON_H
+#define CACHE_DIST_COMMON_H
+
+#define VARY_FORMAT_VERSION 5
+#define DISK_FORMAT_VERSION 6
+
+#define CACHE_HEADER_SUFFIX ".header"
+#define CACHE_DATA_SUFFIX   ".data"
+#define CACHE_VDIR_SUFFIX   ".vary"
+
+#define AP_TEMPFILE_PREFIX "/"
+#define AP_TEMPFILE_BASE   "aptmp"
+#define AP_TEMPFILE_SUFFIX "XXXXXX"
+#define AP_TEMPFILE_BASELEN strlen(AP_TEMPFILE_BASE)
+#define AP_TEMPFILE_NAMELEN strlen(AP_TEMPFILE_BASE AP_TEMPFILE_SUFFIX)
+#define AP_TEMPFILE AP_TEMPFILE_PREFIX AP_TEMPFILE_BASE AP_TEMPFILE_SUFFIX
+
+typedef struct {
+    /* Indicates the format of the header struct stored on-disk. */
+    apr_uint32_t format;
+    /* The HTTP status code returned for this response.  */
+    int status;
+    /* The size of the entity name that follows. */
+    apr_size_t name_len;
+    /* The number of times we've cached this entity. */
+    apr_size_t entity_version;
+    /* Miscellaneous time values. */
+    apr_time_t date;
+    apr_time_t expire;
+    apr_time_t request_time;
+    apr_time_t response_time;
+    /* The ident of the body file, so we can test the body matches the header */
+    apr_ino_t inode;
+    apr_dev_t device;
+    /* Does this cached request have a body? */
+    unsigned int has_body:1;
+    unsigned int header_only:1;
+    /* The parsed cache control header */
+    cache_control_t control;
+} disk_cache_info_t;
+
+#endif /* CACHE_DIST_COMMON_H */
+/** @} */