HDFS-6618. FSNamesystem#delete drops the FSN lock between removing INodes from the tree and deleting them from the inode map (kihwal via cmccabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1609380 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6622. Rename and AddBlock may race and produce invalid edits (kihwal via cmccabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1609384 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6645. Add test for successive Snapshots between XAttr modifications. Contributed by Stephen Chu.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1609388 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6643. Refactor INodeWithAdditionalFields.PermissionStatusFormat and INodeFile.HeaderFormat.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1609401 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10812. Delegate KeyProviderExtension#toString to underlying KeyProvider. (wang)

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