[pynfs PATCH v2 5/5] LOCK24: fix the lock_seqid in second lock request

[Jeff Layton <jlayton@kernel.org>]

This test currently fails against Linux nfsd, but I think it's the test
that's wrong. It basically does:

open for read
read lock
unlock
open upgrade
write lock

The write lock above is sent with a lock_seqid of 0, which is wrong.
RFC7530/16.10.5 says:

   o  In the case in which the state has been created and the [new
      lockowner] boolean is true, the server rejects the request with the
      error NFS4ERR_BAD_SEQID.  The only exception is where there is a
      retransmission of a previous request in which the boolean was
      true.  In this case, the lock_seqid will match the original
      request, and the response will reflect the final case, below.

Since the above is not a retransmission, knfsd is correct to reject
this call. This patch fixes the open_sequence object to track the lock
seqid and set it correctly in the LOCK request.

With this, LOCK24 passes against knfsd.

Cc: Frank Filz <ffilz@redhat.com>
Fixes: 4299316fb357 (Add LOCK24 test case to test open uprgade/downgrade scenario)
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 nfs4.0/servertests/st_lock.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/nfs4.0/servertests/st_lock.py b/nfs4.0/servertests/st_lock.py
index 468672403ffe..9d650ab017b9 100644
--- a/nfs4.0/servertests/st_lock.py
+++ b/nfs4.0/servertests/st_lock.py
@@ -886,6 +886,7 @@ class open_sequence:
         self.client = client
         self.owner = owner
         self.lockowner = lockowner
+        self.lockseqid = 0
     def open(self, access):
         self.fh, self.stateid = self.client.create_confirm(self.owner,
 						access=access,
@@ -900,14 +901,17 @@ class open_sequence:
         self.client.close_file(self.owner, self.fh, self.stateid)
     def lock(self, type):
         res = self.client.lock_file(self.owner, self.fh, self.stateid,
-                    type=type, lockowner=self.lockowner)
+                                    type=type, lockowner=self.lockowner,
+                                    lockseqid=self.lockseqid)
         check(res)
         if res.status == NFS4_OK:
             self.lockstateid = res.lockid
+            self.lockseqid += 1
     def unlock(self):
         res = self.client.unlock_file(1, self.fh, self.lockstateid)
         if res.status == NFS4_OK:
             self.lockstateid = res.lockid
+            self.lockseqid += 1
 
 def testOpenUpgradeLock(t, env):
     """Try open, lock, open, downgrade, close
-- 
2.39.2