expose more options in the c api (#1067)

db/c.cc

@@ -1418,6 +1418,11 @@ void rocksdb_options_set_compaction_filter_factory(
       std::shared_ptr<CompactionFilterFactory>(factory);
 }
 
+void rocksdb_options_compaction_readahead_size(
+    rocksdb_options_t* opt, size_t s) {
+  opt->rep.compaction_readahead_size = s;
+}
+
 void rocksdb_options_set_comparator(
     rocksdb_options_t* opt,
     rocksdb_comparator_t* cmp) {

include/rocksdb/c.h

@@ -501,6 +501,8 @@ extern ROCKSDB_LIBRARY_API void rocksdb_options_set_compaction_filter(
     rocksdb_options_t*, rocksdb_compactionfilter_t*);
 extern ROCKSDB_LIBRARY_API void rocksdb_options_set_compaction_filter_factory(
     rocksdb_options_t*, rocksdb_compactionfilterfactory_t*);
+extern ROCKSDB_LIBRARY_API void rocksdb_options_compaction_readahead_size(
+    rocksdb_options_t*, size_t);
 extern ROCKSDB_LIBRARY_API void rocksdb_options_set_comparator(
     rocksdb_options_t*, rocksdb_comparator_t*);
 extern ROCKSDB_LIBRARY_API void rocksdb_options_set_merge_operator(
@@ -526,6 +528,8 @@ extern ROCKSDB_LIBRARY_API void rocksdb_options_set_info_log_level(
     rocksdb_options_t*, int);
 extern ROCKSDB_LIBRARY_API void rocksdb_options_set_write_buffer_size(
     rocksdb_options_t*, size_t);
+extern ROCKSDB_LIBRARY_API void rocksdb_options_set_db_write_buffer_size(
+    rocksdb_options_t*, size_t);
 extern ROCKSDB_LIBRARY_API void rocksdb_options_set_max_open_files(
     rocksdb_options_t*, int);
 extern ROCKSDB_LIBRARY_API void rocksdb_options_set_max_total_wal_size(