From: Aaron Gao <gzh@fb.com>
Date: Wed, 22 Feb 2017 22:48:09 +0000 (-0800)
Subject: add use_direct_io() to ReadaheadRandomAccessFile
X-Git-Tag: rocksdb-5.1.3~2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=a3576c7c4b3d57af73a2e0a2ea18ff60716bd567;p=rocksdb.git

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
---

diff --git a/util/file_reader_writer.cc b/util/file_reader_writer.cc
index 877d48b2..e68ff467 100644
--- a/util/file_reader_writer.cc
+++ b/util/file_reader_writer.cc
@@ -543,6 +543,10 @@ class ReadaheadRandomAccessFile : public RandomAccessFile {
     return file_->InvalidateCache(offset, length);
   }
 
+  virtual bool use_direct_io() const override {
+    return file_->use_direct_io();
+  }
+
  private:
   std::unique_ptr<RandomAccessFile> file_;
   size_t               readahead_size_;