Helper function to catch memory pool leaks.

WHATS_NEW

@@ -1,5 +1,6 @@
 Version 2.02.46 - 
 ================================
+  Add memory pool leaks detection.
   Use copy of PV structure when manipulating with global PV lists.
   Always return exit error status when locking of volume group fails.
   Fix mirror log convert validation question.

libdm/ioctl/libdm-iface.c

@@ -1817,12 +1817,15 @@ void dm_lib_release(void)
 	update_devs();
 }
 
+void dm_pools_check_leaks(void);
+
 void dm_lib_exit(void)
 {
 	dm_lib_release();
 	if (_dm_bitset)
 		dm_bitset_destroy(_dm_bitset);
 	_dm_bitset = NULL;
+	dm_pools_check_leaks();
 	dm_dump_memory();
 	_version_ok = 1;
 	_version_checked = 0;

libdm/mm/pool-debug.c

@@ -30,7 +30,9 @@ typedef struct {
 } pool_stats;
 
 struct dm_pool {
+	struct dm_list list;
 	const char *name;
+	void *orig_pool;	/* to pair it with first allocation call */
 
 	int begun;
 	struct block *object;
@@ -65,10 +67,13 @@ struct dm_pool *dm_pool_create(const char *name, size_t chunk_hint)
 	mem->stats.bytes = 0;
 	mem->stats.maxbytes = 0;
 
+	mem->orig_pool = mem;
+
 #ifdef DEBUG_POOL
 	log_debug("Created mempool %s", name);
 #endif
 
+	dm_list_add(&_dm_pools, &mem->list);
 	return mem;
 }
 
@@ -103,6 +108,7 @@ void dm_pool_destroy(struct dm_pool *p)
 {
 	_pool_stats(p, "Destroying");
 	_free_blocks(p, p->blocks);
+	dm_list_del(&p->list);
 	dm_free(p);
 }
 

libdm/mm/pool-fast.c

@@ -21,6 +21,7 @@ struct chunk {
 };
 
 struct dm_pool {
+	struct dm_list list;
 	struct chunk *chunk, *spare_chunk;	/* spare_chunk is a one entry free
 						   list to stop 'bobbling' */
 	size_t chunk_size;
@@ -51,6 +52,7 @@ struct dm_pool *dm_pool_create(const char *name, size_t chunk_hint)
 	while (new_size < p->chunk_size)
 		new_size <<= 1;
 	p->chunk_size = new_size;
+	dm_list_add(&_dm_pools, &p->list);
 	return p;
 }
 
@@ -65,6 +67,7 @@ void dm_pool_destroy(struct dm_pool *p)
 		c = pr;
 	}
 
+	dm_list_del(&p->list);
 	dm_free(p);
 }
 

libdm/mm/pool.c

@@ -15,6 +15,10 @@
 
 #include "dmlib.h"
 
+/* FIXME: thread unsafe */
+static DM_LIST_INIT(_dm_pools);
+void dm_pools_check_leaks(void);
+
 #ifdef DEBUG_POOL
 #include "pool-debug.c"
 #else
@@ -52,3 +56,22 @@ void *dm_pool_zalloc(struct dm_pool *p, size_t s)
 
 	return ptr;
 }
+
+void dm_pools_check_leaks(void)
+{
+	struct dm_pool *p;
+
+	if (dm_list_empty(&_dm_pools))
+		return;
+
+	log_error("You have a memory leak (not released memory pool):");
+	dm_list_iterate_items(p, &_dm_pools) {
+#ifdef DEBUG_POOL
+		log_error(" [%p] %s (%u bytes)",
+			  p->orig_pool,
+			  p->name, p->stats.bytes);
+#else
+		log_error(" [%p]", p);
+#endif
+	}
+}