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-5.2.1~4
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=3eb69567287c18feaef2163e2c91c6a37e989822;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 81214cbe6..cda3efe30 100644
--- a/util/file_reader_writer.cc
+++ b/util/file_reader_writer.cc
@@ -559,6 +559,10 @@ 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 {