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hdfs permission unworked in hdfs nfs
Hi
  I am testing the hadoop nfs within hadoop-2.2.0.
  I succeed to mount the hdfs to my /mnt/hadoop :
#mount -t nfs -o vers=3,proto=tcp,nolock $mynamenodeIP:/ /mn/hadoop

 I test the permission check when I cp something to the /mn/hadoop,It
worked.
[root@hadoop2 ~]# cp install.log /mnt/
cp: cannot create regular file `/mnt/install.log': Permission denied
After that,I create a softlink to a Logs directory belong to php
application.
#ll -a
  lrwxrwxrwx 1 root root    11 12-12 05:06 Logs -> /mnt/hadoop

Magic thing comes out ,the permission check passed,the Logger can log to my
Logs directory[1]. I still can not write any thing as root user to the *Logs
*directory because of the permission check which is quite known before.

  Any explanation about the unworking permission in my test?
[1]Logsdirectory-------------------------------------------------------------------------------------------------------
2013-12-12 11:00:27,875 INFO org.apache.hadoop.hdfs.StateChange: BLOCK*
fsync: /.reserved/.inodes/16385/13_12_12_AGENTS_TERM.log for
DFSClient_NONMAPREDUCE_-1541949548_23
2013-12-12 11:00:27,891 INFO org.apache.hadoop.hdfs.StateChange: BLOCK*
fsync: /.reserved/.inodes/16385/13_12_12_db_Mysql.log for
DFSClient_NONMAPREDUCE_-1541949548_23
2013-12-12 11:00:27,906 INFO org.apache.hadoop.hdfs.StateChange: BLOCK*
fsync: /.reserved/.inodes/16385/13_12_12_db_Mysql.log for
DFSClient_NONMAPREDUCE_-1541949548_23
2013-12-12 11:00:27,919 INFO org.apache.hadoop.hdfs.StateChange: BLOCK*
fsync: /.reserved/.inodes/16385/13_12_12_AGENTS_TERM.log for
DFSClient_NONMAPREDUCE_-1541949548_23
2013-12-12 11:00:27,932 INFO org.apache.hadoop.hdfs.StateChange: BLOCK*
fsync: /.reserved/.inodes/16385/13_12_12_AGENTS_TERM.log for
DFSClient_NONMAPREDUCE_-1541949548_23
2013-12-12 11:00:27,945 INFO org.apache.hadoop.hdfs.StateChange: BLOCK*
fsync: /.reserved/.inodes/16385/13_12_12_AGENTS_TERM.log for
DFSClient_NONMAPREDUCE_-1541949548_23
2013-12-12 11:00:27,963 INFO org.apache.hadoop.hdfs.StateChange: BLOCK*
fsync: /.reserved/.inodes/16385/13_12_12_systemErr.log for
DFSClient_NONMAPREDUCE_-1541949548_23