Merge HDFS-5789. Some of snapshot APIs missing checkOperation double check in fsn. Contributed by Uma Maheswara Rao G.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1560732 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -836,6 +836,8 @@ Release 2.3.0 - UNRELEASED
     HDFS-5649. Unregister NFS and Mount service when NFS gateway is shutting down.
     (brandonli)
 
+    HDFS-5789. Some of snapshot APIs missing checkOperation double check in fsn. (umamahesh)
+
 Release 2.2.0 - 2013-10-13
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java

@@ -6777,6 +6777,7 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
   
   /** Allow snapshot on a directroy. */
   void allowSnapshot(String path) throws SafeModeException, IOException {
+    checkOperation(OperationCategory.WRITE);
     writeLock();
     try {
       checkOperation(OperationCategory.WRITE);
@@ -6802,6 +6803,7 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
   
   /** Disallow snapshot on a directory. */
   void disallowSnapshot(String path) throws SafeModeException, IOException {
+    checkOperation(OperationCategory.WRITE);
     writeLock();
     try {
       checkOperation(OperationCategory.WRITE);
@@ -6925,6 +6927,7 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
   public SnapshottableDirectoryStatus[] getSnapshottableDirListing()
       throws IOException {
     SnapshottableDirectoryStatus[] status = null;
+    checkOperation(OperationCategory.READ);
     final FSPermissionChecker checker = getPermissionChecker();
     readLock();
     try {
@@ -6958,6 +6961,7 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
   SnapshotDiffReport getSnapshotDiffReport(String path,
       String fromSnapshot, String toSnapshot) throws IOException {
     SnapshotDiffInfo diffs = null;
+    checkOperation(OperationCategory.READ);
     final FSPermissionChecker pc = getPermissionChecker();
     readLock();
     try {