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diff --git a/lib/util/memcache.h b/lib/util/memcache.h
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+/*
+   Unix SMB/CIFS implementation.
+   In-memory cache
+   Copyright (C) Volker Lendecke 2007-2008
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __MEMCACHE_H__
+#define __MEMCACHE_H__
+
+#include <talloc.h>
+#include "lib/util/data_blob.h"
+
+struct memcache;
+
+/*
+ * A memcache can store different subkeys with overlapping keys, the
+ * memcache_number becomes part of the key. Feel free to add caches of your
+ * own here.
+ *
+ * If you add talloc type caches, also note this in the switch statement in
+ * memcache_is_talloc().
+ */
+
+enum memcache_number {
+	STAT_CACHE,
+	GETREALFILENAME_CACHE,
+	GETWD_CACHE,
+	GETPWNAM_CACHE,		/* talloc */
+	MANGLE_HASH2_CACHE,
+	PDB_GETPWSID_CACHE,	/* talloc */
+	SINGLETON_CACHE_TALLOC,	/* talloc */
+	SINGLETON_CACHE,
+	SMB1_SEARCH_OFFSET_MAP,
+	SHARE_MODE_LOCK_CACHE,	/* talloc */
+	VIRUSFILTER_SCAN_RESULTS_CACHE_TALLOC, /* talloc */
+	DFREE_CACHE,
+};
+
+/*
+ * Create a memcache structure. max_size is in bytes, if you set it 0 it will
+ * not forget anything.
+ */
+
+struct memcache *memcache_init(TALLOC_CTX *mem_ctx, size_t max_size);
+
+/*
+ * If you set this global memcache, use it as the default cache when NULL is
+ * passed to the memcache functions below. This is a workaround for many
+ * situations where passing the cache everywhere would be a big hassle.
+ */
+
+void memcache_set_global(struct memcache *cache);
+
+/*
+ * Add a data blob to the cache
+ */
+
+bool memcache_add(struct memcache *cache, enum memcache_number n,
+		  DATA_BLOB key, DATA_BLOB value);
+
+/*
+ * Add a talloc object to the cache. The difference to memcache_add() is that
+ * when the objects is to be discarded, talloc_free is called for it. Also
+ * talloc_move() ownership of the object to the cache.
+ *
+ * Please note that the current implementation has a fixed relationship
+ * between what cache subtypes store talloc objects and which ones store plain
+ * blobs. We can fix this, but for now we don't have a mixed use of blobs vs
+ * talloc objects in the cache types.
+ */
+
+bool memcache_add_talloc(struct memcache *cache, enum memcache_number n,
+			 DATA_BLOB key, void *ptr);
+
+/*
+ * Delete an object from the cache
+ */
+
+void memcache_delete(struct memcache *cache, enum memcache_number n,
+		     DATA_BLOB key);
+
+/*
+ * Look up an object from the cache. Memory still belongs to the cache, so
+ * make a copy of it if needed.
+ */
+
+bool memcache_lookup(struct memcache *cache, enum memcache_number n,
+		     DATA_BLOB key, DATA_BLOB *value);
+
+/*
+ * Look up an object from the cache. Memory still belongs to the cache, so
+ * make a copy of it if needed.
+ */
+
+void *memcache_lookup_talloc(struct memcache *cache, enum memcache_number n,
+			     DATA_BLOB key);
+
+/*
+ * Flush a complete cache subset.
+ */
+
+void memcache_flush(struct memcache *cache, enum memcache_number n);
+
+void gfree_memcache(void);
+
+#endif