Add a global cache

It hurts, but I think this global variable is necessary for transition, and it
has the potential to remove quite a few other global variables without messing
with APIs too much.
(This used to be commit c131d0dc52ec09c9227eff3d68877369c37aaed5)

3 files changed, 44 insertions, 0 deletions

diff --git a/source3/include/memcache.h b/source3/include/memcache.h
index f849f8ad3b..0ba3bdbb00 100644
--- a/source3/include/memcache.h
+++ b/source3/include/memcache.h
@@ -37,6 +37,8 @@ enum memcache_number {
 
 struct memcache *memcache_init(TALLOC_CTX *mem_ctx, size_t max_size);
 
+void memcache_set_global(struct memcache *cache);
+
 void memcache_add(struct memcache *cache, enum memcache_number n,
 		  DATA_BLOB key, DATA_BLOB value);
 
diff --git a/source3/lib/memcache.c b/source3/lib/memcache.c
index 17630066ae..38bbd66085 100644
--- a/source3/lib/memcache.c
+++ b/source3/lib/memcache.c
@@ -20,6 +20,8 @@
 #include "memcache.h"
 #include "rbtree.h"
 
+static struct memcache *global_cache;
+
 struct memcache_element {
 	struct rb_node rb_node;
 	struct memcache_element *prev, *next;
@@ -58,6 +60,12 @@ struct memcache *memcache_init(TALLOC_CTX *mem_ctx, size_t max_size)
 	return result;
 }
 
+void memcache_set_global(struct memcache *cache)
+{
+	TALLOC_FREE(global_cache);
+	global_cache = cache;
+}
+
 static struct memcache_element *memcache_node2elem(struct rb_node *node)
 {
 	return (struct memcache_element *)
@@ -119,6 +127,13 @@ bool memcache_lookup(struct memcache *cache, enum memcache_number n,
 {
 	struct memcache_element *e;
 
+	if (cache == NULL) {
+		cache = global_cache;
+	}
+	if (cache == NULL) {
+		return false;
+	}
+
 	e = memcache_find(cache, n, key);
 	if (e == NULL) {
 		return false;
@@ -172,6 +187,13 @@ void memcache_delete(struct memcache *cache, enum memcache_number n,
 {
 	struct memcache_element *e;
 
+	if (cache == NULL) {
+		cache = global_cache;
+	}
+	if (cache == NULL) {
+		return;
+	}
+
 	e = memcache_find(cache, n, key);
 	if (e == NULL) {
 		return;
@@ -189,6 +211,13 @@ void memcache_add(struct memcache *cache, enum memcache_number n,
 	DATA_BLOB cache_key, cache_value;
 	size_t element_size;
 
+	if (cache == NULL) {
+		cache = global_cache;
+	}
+	if (cache == NULL) {
+		return;
+	}
+
 	if (key.length == 0) {
 		return;
 	}
@@ -258,6 +287,13 @@ void memcache_flush(struct memcache *cache, enum memcache_number n)
 {
 	struct rb_node *node;
 
+	if (cache == NULL) {
+		cache = global_cache;
+	}
+	if (cache == NULL) {
+		return;
+	}
+
 	/*
 	 * Find the smallest element of number n
 	 */
diff --git a/source3/smbd/server.c b/source3/smbd/server.c
index 40037074f6..43a6d62a28 100644
--- a/source3/smbd/server.c
+++ b/source3/smbd/server.c
@@ -1191,6 +1191,12 @@ extern void build_options(bool screen);
 	if (smbd_messaging_context() == NULL)
 		exit(1);
 
+	if (smbd_memcache() == NULL) {
+		exit(1);
+	}
+
+	memcache_set_global(smbd_memcache());
+
 	/* Initialise the password backed before the global_sam_sid
 	   to ensure that we fetch from ldap before we make a domain sid up */