[PATCH 1/1] nfs41: prevent exchange_id from sending server-only flag

[andros@netapp.com]

From: Fred Isaman <iisaman@citi.umich.edu>

clp->cl_exchange_flags is used both for client output and server input.
This causes problems in certain recovery situations, when the server
has sent back EXCHGID4_FLAG_CONFIRMED_R, causing the client to erroneously
use the flag in future EXCHANGE_ID requests.

Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
---
 fs/nfs/nfs4proc.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 198d51d..e5fea95 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -4427,7 +4427,7 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
 	nfs4_verifier verifier;
 	struct nfs41_exchange_id_args args = {
 		.client = clp,
-		.flags = clp->cl_exchange_flags,
+		.flags = clp->cl_exchange_flags & ~EXCHGID4_FLAG_CONFIRMED_R,
 	};
 	struct nfs41_exchange_id_res res = {
 		.client = clp,
-- 
1.6.2.5