block alloc: add validations around cache_entry lifecyle

Add an option (controlled by an environment variable) perform extra
validations on mem_pool allocated cache entries. When set:

  1) Invalidate cache_entry memory when discarding cache_entry.

  2) When discarding index_state struct, verify that all cache_entries
     were allocated from expected mem_pool.

  3) When discarding mem_pools, invalidate mem_pool memory.

This should provide extra checks that mem_pools and their allocated
cache_entries are being used as expected.

Signed-off-by: Jameson Miller <jamill@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/mem-pool.h b/mem-pool.h
index adeefdc..999d3c3 100644
--- a/mem-pool.h
+++ b/mem-pool.h
@@ -29,7 +29,7 @@ void mem_pool_init(struct mem_pool **mem_pool, size_t initial_size);
 /*
  * Discard a memory pool and free all the memory it is responsible for.
  */
-void mem_pool_discard(struct mem_pool *mem_pool);
+void mem_pool_discard(struct mem_pool *mem_pool, int invalidate_memory);
 
 /*
  * Alloc memory from the mem_pool.