Expose DisableManualCompaction and EnableManualCompaction to C api (#10052)

Summary:
Add `rocksdb_disable_manual_compaction` and `rocksdb_enable_manual_compaction`.

Note that `rocksdb_enable_manual_compaction` should be used with care and must not be called more times than `rocksdb_disable_manual_compaction` has been called.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10052

Reviewed By: ajkr

Differential Revision: D36665496

Pulled By: jay-zhuang

fbshipit-source-id: a4ae6e34694066feb21302ca1a5c365fb9de0ec7

db/c.cc

@@ -5855,6 +5855,14 @@ void rocksdb_cancel_all_background_work(rocksdb_t* db, unsigned char wait) {
   CancelAllBackgroundWork(db->rep, wait);
 }
 
+void rocksdb_disable_manual_compaction(rocksdb_t* db) {
+  db->rep->DisableManualCompaction();
+}
+
+void rocksdb_enable_manual_compaction(rocksdb_t* db) {
+  db->rep->EnableManualCompaction();
+}
+
 }  // end extern "C"
 
 #endif  // !ROCKSDB_LITE

db/c_test.c

@@ -293,6 +293,16 @@ static rocksdb_t* CheckCompaction(rocksdb_t* db, rocksdb_options_t* options,
   CheckNoError(err);
   CheckGet(db, roptions, "baz", "bazvalue");
 
+  // Disable compaction
+  rocksdb_disable_manual_compaction(db);
+  rocksdb_compact_range(db, NULL, 0, NULL, 0);
+  // should not filter anything when disabled
+  CheckGet(db, roptions, "foo", "foovalue");
+  CheckGet(db, roptions, "bar", "barvalue");
+  CheckGet(db, roptions, "baz", "bazvalue");
+  // Reenable compaction
+  rocksdb_enable_manual_compaction(db);
+
   // Force compaction
   rocksdb_compact_range(db, NULL, 0, NULL, 0);
   // should have filtered bar, but not foo

include/rocksdb/c.h

@@ -2464,6 +2464,11 @@ rocksdb_options_set_memtable_whole_key_filtering(rocksdb_options_t*,
 extern ROCKSDB_LIBRARY_API void rocksdb_cancel_all_background_work(
     rocksdb_t* db, unsigned char wait);
 
+extern ROCKSDB_LIBRARY_API void rocksdb_disable_manual_compaction(
+    rocksdb_t* db);
+
+extern ROCKSDB_LIBRARY_API void rocksdb_enable_manual_compaction(rocksdb_t* db);
+
 #ifdef __cplusplus
 }  /* end extern "C" */
 #endif