Add C API for setting `strict_capacity_limit` (#9855)

Summary:
This allows to set with true the field `strict_capacity_limit` from C
API and other languages that wrap that.
Signed-off-by: NFederico Guerinoni <guerinoni.federico@gmail.com>

Closes: https://github.com/facebook/rocksdb/issues/9707

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9855

Reviewed By: ajkr

Differential Revision: D35724150

Pulled By: jay-zhuang

fbshipit-source-id: d8514797e9d90b1cd88329018f9ac4776722aa0f

db/c.cc

@@ -4193,6 +4193,14 @@ rocksdb_cache_t* rocksdb_cache_create_lru(size_t capacity) {
   return c;
 }
 
+rocksdb_cache_t* rocksdb_cache_create_lru_with_strict_capacity_limit(
+    size_t capacity) {
+  rocksdb_cache_t* c = new rocksdb_cache_t;
+  c->rep = NewLRUCache(capacity);
+  c->rep->SetStrictCapacityLimit(true);
+  return c;
+}
+
 rocksdb_cache_t* rocksdb_cache_create_lru_opts(
     rocksdb_lru_cache_options_t* opt) {
   rocksdb_cache_t* c = new rocksdb_cache_t;

include/rocksdb/c.h

@@ -1766,6 +1766,8 @@ extern ROCKSDB_LIBRARY_API void rocksdb_lru_cache_options_set_memory_allocator(
 
 extern ROCKSDB_LIBRARY_API rocksdb_cache_t* rocksdb_cache_create_lru(
     size_t capacity);
+extern ROCKSDB_LIBRARY_API rocksdb_cache_t*
+rocksdb_cache_create_lru_with_strict_capacity_limit(size_t capacity);
 extern ROCKSDB_LIBRARY_API rocksdb_cache_t* rocksdb_cache_create_lru_opts(
     rocksdb_lru_cache_options_t*);
 extern ROCKSDB_LIBRARY_API void rocksdb_cache_destroy(rocksdb_cache_t* cache);