expose flush reason for flush job info as well as compaction reason for sub compaction job info via c api (facebook#13770)

Summary:
follow up to facebook#13601

Pull Request resolved: facebook#13770

Reviewed By: hx235

Differential Revision: D78426229

Pulled By: cbi42

fbshipit-source-id: d583288b87f9ab0d05421b3daeb57e297edf5ad6

Author: zaidoon1

db/c.cc

@@ -925,6 +925,10 @@ void rocksdb_backup_engine_options_destroy(
   delete options;
 }
 
+void rocksdb_status_ptr_get_error(rocksdb_status_ptr_t* status, char** errptr) {
+  SaveError(errptr, *(status->rep));
+}
+
 rocksdb_checkpoint_t* rocksdb_checkpoint_object_create(rocksdb_t* db,
                                                        char** errptr) {
   Checkpoint* checkpoint;
@@ -3061,6 +3065,10 @@ uint64_t rocksdb_flushjobinfo_smallest_seqno(
   return info->rep.smallest_seqno;
 }
 
+uint32_t rocksdb_flushjobinfo_flush_reason(const rocksdb_flushjobinfo_t* info) {
+  return static_cast<uint32_t>(info->rep.flush_reason);
+}
+
 void rocksdb_reset_status(rocksdb_status_ptr_t* status_ptr) {
   auto ptr = status_ptr->rep;
   *ptr = Status::OK();
@@ -3192,6 +3200,11 @@ int rocksdb_subcompactionjobinfo_output_level(
   return info->rep.output_level;
 }
 
+uint32_t rocksdb_subcompactionjobinfo_compaction_reason(
+    const rocksdb_subcompactionjobinfo_t* info) {
+  return static_cast<uint32_t>(info->rep.compaction_reason);
+}
+
 /* ExternalFileIngestionInfo */
 
 const char* rocksdb_externalfileingestioninfo_cf_name(

include/rocksdb/c.h

@@ -1171,6 +1171,8 @@ extern ROCKSDB_LIBRARY_API uint64_t
 rocksdb_flushjobinfo_smallest_seqno(const rocksdb_flushjobinfo_t*);
 extern ROCKSDB_LIBRARY_API void rocksdb_reset_status(
     rocksdb_status_ptr_t* status_ptr);
+extern ROCKSDB_LIBRARY_API uint32_t
+rocksdb_flushjobinfo_flush_reason(const rocksdb_flushjobinfo_t* info);
 
 /* Compaction job info */
 extern ROCKSDB_LIBRARY_API void rocksdb_compactionjobinfo_status(
@@ -1221,6 +1223,9 @@ extern ROCKSDB_LIBRARY_API int rocksdb_subcompactionjobinfo_base_input_level(
     const rocksdb_subcompactionjobinfo_t*);
 extern ROCKSDB_LIBRARY_API int rocksdb_subcompactionjobinfo_output_level(
     const rocksdb_subcompactionjobinfo_t*);
+extern ROCKSDB_LIBRARY_API uint32_t
+rocksdb_subcompactionjobinfo_compaction_reason(
+    const rocksdb_subcompactionjobinfo_t* info);
 
 /* External file ingestion info */
 extern ROCKSDB_LIBRARY_API const char*