[CIFS] Add support for new POSIX unlink

In the cleanup phase of the dbench test, we were noticing sharing
violation followed by failed directory removals when dbench
did not close the test files before the cleanup phase started.
Using the new POSIX unlink, which Samba has supported for a few
months, avoids this.

Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/CHANGES b/fs/cifs/CHANGES
index f92e0ee..6d84ca2 100644
--- a/fs/cifs/CHANGES
+++ b/fs/cifs/CHANGES
@@ -1,7 +1,9 @@
 Version 1.50
 ------------
 Fix NTLMv2 signing. NFS server mounted over cifs works (if cifs mount is
-done with "serverino" mount option).
+done with "serverino" mount option).  Add support for POSIX Unlink
+(helps with certain sharing violation cases when server such as
+Samba supports newer POSIX CIFS Protocol Extensions).
 
 Version 1.49
 ------------