From 280f9fb7289fb189c806d0a0854d6cf30c0a14d8 Mon Sep 17 00:00:00 2001
From: Gerardo Ganis <Gerardo.Ganis@cern.ch>
Date: Tue, 24 Jan 2017 12:37:52 +0100
Subject: [PATCH] io/io: fix for ROOT-8516 (corruption in file writing)
When the write-cache required flushing to file and the length of the buffer
to be written exceed the size of the cache buffer, requiring
direct-write-to-file, the offset (seek position) was incorrectly left to
the one of the last basket in the flushed cache.
---
io/io/src/TFileCacheWrite.cxx | 1 +
1 file changed, 1 insertion(+)
diff --git a/io/io/src/TFileCacheWrite.cxx b/io/io/src/TFileCacheWrite.cxx
index 5cdd1d8f547..f9bdf341465 100644
--- a/io/io/src/TFileCacheWrite.cxx
+++ b/io/io/src/TFileCacheWrite.cxx
@@ -133,6 +133,7 @@ Int_t TFileCacheWrite::WriteBuffer(const char *buf, Long64_t pos, Int_t len)
if (len >= fBufferSize) {
//buffer larger than the cache itself: direct write to file
fRecursive = kTRUE;
+ fFile->Seek(pos); // Flush may have changed this
if (fFile->WriteBuffer(buf,len)) return -1; // failure
fRecursive = kFALSE;
return 1;
--
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