HDFS-860. svn merge -c 1339413 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1339414 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -579,6 +579,9 @@ Release 2.0.0-alpha - UNRELEASED
 
     HDFS-3026. HA: Handle failure during HA state transition. (atm)
 
+    HDFS-860. fuse-dfs truncate behavior causes issues with scp.
+    (Brian Bockelman via eli)
+
   BREAKDOWN OF HDFS-1623 SUBTASKS
 
     HDFS-2179. Add fencing framework and mechanisms for NameNode HA. (todd)

hadoop-hdfs-project/hadoop-hdfs/src/contrib/fuse-dfs/src/fuse_impls_truncate.c

@@ -37,7 +37,7 @@ int dfs_truncate(const char *path, off_t size)
   assert(dfs);
 
   if (size != 0) {
-    return -ENOTSUP;
+    return 0;
   }
 
   int ret = dfs_unlink(path);