Fix build errors for windows

Summary:
- Need to use unsigned long long for 64-bit literals on windows
- Need size_t for backup meta-file length since clang doesn't let us assign size_t to int

Test Plan: backupable_db_test and options_test

Reviewers: IslamAbdelRahman, yhchiang, sdong

Reviewed By: sdong

Subscribers: andrewkr, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D56391

util/options.cc

@@ -104,8 +104,8 @@ ColumnFamilyOptions::ColumnFamilyOptions()
       max_grandparent_overlap_factor(10),
       soft_rate_limit(0.0),
       hard_rate_limit(0.0),
-      soft_pending_compaction_bytes_limit(64 * 1073741824ul),
+      soft_pending_compaction_bytes_limit(64 * 1073741824ull),
-      hard_pending_compaction_bytes_limit(256 * 1073741824ul),
+      hard_pending_compaction_bytes_limit(256 * 1073741824ull),
       rate_limit_delay_max_milliseconds(1000),
       arena_block_size(0),
       disable_auto_compactions(false),

utilities/backupable/backupable_db.cc

@@ -1702,7 +1702,7 @@ Status BackupEngineImpl::BackupMeta::StoreToFile(bool sync) {
   }
 
   unique_ptr<char[]> buf(new char[max_backup_meta_file_size_]);
-  int len = 0, buf_size = max_backup_meta_file_size_;
+  size_t len = 0, buf_size = max_backup_meta_file_size_;
   len += snprintf(buf.get(), buf_size, "%" PRId64 "\n", timestamp_);
   len += snprintf(buf.get() + len, buf_size - len, "%" PRIu64 "\n",
                   sequence_number_);
@@ -1710,7 +1710,7 @@ Status BackupEngineImpl::BackupMeta::StoreToFile(bool sync) {
     std::string hex_encoded_metadata =
         Slice(app_metadata_).ToString(/* hex */ true);
     if (hex_encoded_metadata.size() + kMetaDataPrefix.size() + 1 >
-        (size_t)(buf_size - len)) {
+        buf_size - len) {
       return Status::Corruption("Buffer too small to fit backup metadata");
     }
     memcpy(buf.get() + len, kMetaDataPrefix.data(), kMetaDataPrefix.size());
@@ -1728,7 +1728,7 @@ Status BackupEngineImpl::BackupMeta::StoreToFile(bool sync) {
                     file->filename.c_str(), file->checksum_value);
   }
 
-  s = backup_meta_file->Append(Slice(buf.get(), (size_t)len));
+  s = backup_meta_file->Append(Slice(buf.get(), len));
   if (s.ok() && sync) {
     s = backup_meta_file->Sync();
   }