From f206af56fcbf8ad4be7d92de03074b471bd62752 Mon Sep 17 00:00:00 2001
From: Aaron Gao <gzh@fb.com>
Date: Wed, 22 Feb 2017 14:48:09 -0800
Subject: [PATCH] add use_direct_io() to ReadaheadRandomAccessFile

Summary:
Missing this function will cause RandomAccessFileReader not doing alignment in Direct IO mode, which introduce an IOError: invalid argument.
Closes https://github.com/facebook/rocksdb/pull/1900

Differential Revision: D4601261

Pulled By: lightmark

fbshipit-source-id: c3eadf1
---
 util/file_reader_writer.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/util/file_reader_writer.cc b/util/file_reader_writer.cc
index 0184bed74..edee46937 100644
--- a/util/file_reader_writer.cc
+++ b/util/file_reader_writer.cc
@@ -522,6 +522,10 @@ class ReadaheadRandomAccessFile : public RandomAccessFile {
     return file_->InvalidateCache(offset, length);
   }
 
+  virtual bool use_direct_io() const override {
+    return file_->use_direct_io();
+  }
+
  private:
   bool TryReadFromCache_(uint64_t offset, size_t n, size_t* cached_len,
                          char* scratch) const {
-- 
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