diff --git a/nfs4.1/server41tests/st_courtesy.py b/nfs4.1/server41tests/st_courtesy.py
index a38ba30b6133..c98a82b26fc9 100644
--- a/nfs4.1/server41tests/st_courtesy.py
+++ b/nfs4.1/server41tests/st_courtesy.py
@@ -9,7 +9,9 @@ from xdrdef.nfs4_type import open_to_lock_owner4
 import nfs_ops
 op = nfs_ops.NFS4ops()
 import threading
+import logging
 
+log = logging.getLogger("test.env")
 
 def _getleasetime(sess):
     res = sess.compound([op.putrootfh(), op.getattr(1 << FATTR4_LEASE_TIME)])
@@ -80,3 +82,205 @@ def testLockSleepLock(t, env):
     stateid = res.resarray[-2].stateid
     res = sess2.compound(cour_lockargs(fh, stateid))
     check(res, NFS4_OK)
+
+def testShareReservation00(t, env):
+    """Test OPEN file with OPEN4_SHARE_DENY_WRITE
+       1st client opens file with OPEN4_SHARE_DENY_WRITE
+       1st client opens same file with OPEN4_SHARE_ACCESS_BOTH and OPEN4_SHARE_DENY_NONE
+           expected reply is NFS4ERR_SHARE_DENIED
+       2nd client opens file with OPEN4_SHARE_ACCESS_WRITE
+           expected reply is NFS4ERR_SHARE_DENIED
+       sleep to force lease of client 1 to expire
+       3rd client opens file with OPEN4_SHARE_ACCESS_WRITE
+           expected reply is NFS4_OK
+
+    FLAGS: courteous all
+    CODE: COUR3
+    """
+
+    sess1 = env.c1.new_client_session(env.testname(t))
+    res = create_file(sess1, env.testname(t), want_deleg=False, deny=OPEN4_SHARE_DENY_WRITE)
+    check(res)
+    fh = res.resarray[-1].object
+    stateid = res.resarray[-2].stateid
+
+    claim = open_claim4(CLAIM_FH)
+    how = openflag4(OPEN4_NOCREATE)
+    oowner = open_owner4(0, b"My Open Owner 2")
+    access = OPEN4_SHARE_ACCESS_BOTH|OPEN4_SHARE_ACCESS_WANT_NO_DELEG
+    open_op = op.open(0, access, OPEN4_SHARE_DENY_NONE,
+                      oowner, how, claim)
+    res = sess1.compound([op.putfh(fh), open_op])
+    check(res, NFS4ERR_SHARE_DENIED)
+    log.info("local open conflict detected - PASSED\n")
+
+    """ 2nd client """
+    sess2 = env.c1.new_client_session(b"%s_2" % env.testname(t))
+
+    name = env.testname(t)
+    owner = b"owner_%s" % name
+    path = sess1.c.homedir + [name]
+    res = open_file(sess2, owner, path, access=OPEN4_SHARE_ACCESS_WRITE)
+    check(res, NFS4ERR_SHARE_DENIED)
+    log.info("2nd client open conflict detected - PASSED\n")
+
+    """ force lease of both c1 to expire """
+    log.info("force lease to expire...\n")
+    lease_time = _getleasetime(sess1)
+    env.sleep(lease_time + 10, "the lease period + 10 secs")
+
+    """ 3rd client """
+    sess3 = env.c1.new_client_session(b"%s_3" % env.testname(t))
+
+    """ should succeed """
+    name = env.testname(t)
+    owner = b"owner_%s" % name
+    path = sess3.c.homedir + [name]
+    res = open_file(sess3, owner, path, access=OPEN4_SHARE_ACCESS_WRITE)
+    check(res)
+    log.info("3nd client opened OK - no conflict detected - PASSED\n")
+
+    fh = res.resarray[-1].object
+    stateid = res.resarray[-2].stateid
+
+    res = close_file(sess3, fh, stateid=stateid)
+    check(res)
+
+def testShareReservationDB01(t, env):
+    """ Test 2 clients with same deny mode
+    Client 1 opens file with OPEN4_SHARE_ACCESS_WRITE &  OPEN4_SHARE_DENY_READ
+    Client 2 opens file with OPEN4_SHARE_ACCESS_WRITE &  OPEN4_SHARE_DENY_READ
+    Client 2 open should succeed
+
+    FLAGS: courteous all
+    CODE: COUR4
+    """
+
+    """ client1 creates file with OPEN4_SHARE_ACCESS_WRITE &  OPEN4_SHARE_DENY_READ """
+
+    sess1 = env.c1.new_client_session(env.testname(t))
+    res = create_file(sess1, env.testname(t), want_deleg=False,
+		access=OPEN4_SHARE_ACCESS_WRITE, deny=OPEN4_SHARE_DENY_READ)
+    check(res)
+    fh = res.resarray[-1].object
+    stateid = res.resarray[-2].stateid
+
+    """ create 2nd client """
+    sess2 = env.c1.new_client_session(b"%s_2" % env.testname(t))
+
+    """ client2 open file with OPEN4_SHARE_ACCESS_WRITE &  OPEN4_SHARE_DENY_READ """
+    name = env.testname(t)
+    owner = b"owner_%s" % name
+    path = sess2.c.homedir + [name]
+    res = open_file(sess2, owner, path, deny=OPEN4_SHARE_DENY_READ,
+		access=OPEN4_SHARE_ACCESS_WRITE|OPEN4_SHARE_ACCESS_WANT_NO_DELEG)
+    check(res)
+    fh2 = res.resarray[-1].object
+    stateid2 = res.resarray[-2].stateid
+
+    log.info("2nd client open OK - PASSED\n")
+
+    res = close_file(sess1, fh, stateid=stateid)
+    check(res)
+
+    res = close_file(sess2, fh2, stateid=stateid2)
+    check(res)
+
+def testShareReservationDB02(t, env):
+    """ Test courtesy clients' file access mode conflicts with deny mode
+        client 1 creates file with OPEN4_SHARE_ACCESS_WRITE
+        sleep to force lease of client 1 to expire
+        client 2 opens file with OPEN4_SHARE_ACCESS_READ & OPEN4_SHARE_DENY_WRITE
+            expected reply is NFS4_OK
+
+    FLAGS: courteous all
+    CODE: COUR5
+    """
+
+    """ client1 creates file with OPEN4_SHARE_ACCESS_WRITE """
+
+    sess1 = env.c1.new_client_session(env.testname(t))
+    res = create_file(sess1, env.testname(t), want_deleg=False,
+		access=OPEN4_SHARE_ACCESS_WRITE)
+    check(res)
+    log.info("client 1 creates file OK\n")
+
+    """ force lease of client1 to expire """
+    log.info("force lease to expire...\n")
+    lease_time = _getleasetime(sess1)
+    env.sleep(lease_time + 10, "the lease period + 10 secs")
+
+    """ create 2nd client """
+    sess2 = env.c1.new_client_session(b"%s_2" % env.testname(t))
+
+    """ 2nd client open file with OPEN4_SHARE_ACCESS_READ & OPEN4_SHARE_DENY_WRITE """
+    name = env.testname(t)
+    owner = b"owner_%s" % name
+    path = sess2.c.homedir + [name]
+    res = open_file(sess2, owner, path,
+		access=OPEN4_SHARE_ACCESS_READ|OPEN4_SHARE_ACCESS_WANT_NO_DELEG,
+		deny=OPEN4_SHARE_DENY_WRITE)
+    check(res)
+    fh = res.resarray[-1].object
+    stateid = res.resarray[-2].stateid
+
+    log.info("2nd client open OK - PASSED\n")
+
+    res = close_file(sess2, fh, stateid=stateid)
+    check(res)
+
+def testShareReservationDB03(t, env):
+    """ Test courtesy clients' deny mode conflicts with file access mode
+    Client 1 opens file with with OPEN4_SHARE_ACCESS_WRITE &  OPEN4_SHARE_DENY_READ
+    Client 2 opens same file with with OPEN4_SHARE_ACCESS_WRITE &  OPEN4_SHARE_DENY_READ
+        expected reply is NFS4_OK
+    sleep to force lease of client 1 and client 2 to expire
+    client 3 opens same file with OPEN4_SHARE_ACCESS_READ
+        expected reply is NFS4_OK
+
+    FLAGS: courteous all
+    CODE: COUR6
+    """
+
+    """ client1 creates file with OPEN4_SHARE_ACCESS_WRITE &  OPEN4_SHARE_DENY_READ """
+    sess1 = env.c1.new_client_session(env.testname(t))
+    res = create_file(sess1, env.testname(t), want_deleg=False,
+		access=OPEN4_SHARE_ACCESS_WRITE, deny=OPEN4_SHARE_DENY_READ)
+    check(res)
+    log.info("client 1 creates file OK\n")
+
+    """ create 2nd client """
+    sess2 = env.c1.new_client_session(b"%s_2" % env.testname(t))
+
+    name = env.testname(t)
+    owner = b"owner_%s" % name
+    path = sess2.c.homedir + [name]
+
+    res = open_file(sess2, owner, path,
+		access=OPEN4_SHARE_ACCESS_WRITE|OPEN4_SHARE_ACCESS_WANT_NO_DELEG,
+		deny=OPEN4_SHARE_DENY_READ)
+    check(res)
+    log.info("client 2 open file OK\n")
+
+    """ force lease of client1 and client2 to expire """
+    log.info("force lease to expire...\n")
+    lease_time = _getleasetime(sess1)
+    env.sleep(lease_time + 10, "the lease period + 10 secs")
+
+    """ create 3nd client """
+    sess3 = env.c1.new_client_session(b"%s_3" % env.testname(t))
+
+    """ client3 open file with OPEN4_SHARE_ACCESS_READ """
+    name = env.testname(t)
+    owner = b"owner_%s" % name
+    path = sess3.c.homedir + [name]
+    res = open_file(sess3, owner, path,
+		access=OPEN4_SHARE_ACCESS_READ|OPEN4_SHARE_ACCESS_WANT_NO_DELEG)
+    check(res)
+    fh = res.resarray[-1].object
+    stateid = res.resarray[-2].stateid
+
+    log.info("3rd client open OK - PASSED\n")
+
+    res = close_file(sess3, fh, stateid=stateid)
+    check(res)
