[SRU][J/N][PATCH 1/1] NFSD: Reset cb_seq_status after NFS4ERR_DELAY

[Matthew Ruffell]

From: Chuck Lever <chuck.lever at oracle.com>

BugLink: https://bugs.launchpad.net/bugs/2103564

I noticed that once an NFSv4.1 callback operation gets a
NFS4ERR_DELAY status on CB_SEQUENCE and then the connection is lost,
the callback client loops, resending it indefinitely.

The switch arm in nfsd4_cb_sequence_done() that handles
NFS4ERR_DELAY uses rpc_restart_call() to rearm the RPC state machine
for the retransmit, but that path does not call the rpc_prepare_call
callback again. Thus cb_seq_status is set to -10008 by the first
NFS4ERR_DELAY result, but is never set back to 1 for the retransmits.

nfsd4_cb_sequence_done() thinks it's getting nothing but a
long series of CB_SEQUENCE NFS4ERR_DELAY replies.

Fixes: 7ba6cad6c88f ("nfsd: New helper nfsd4_cb_sequence_done() for processing more cb errors")
Reviewed-by: Jeff Layton <jlayton at kernel.org>
Reviewed-by: Benjamin Coddington <bcodding at redhat.com>
Signed-off-by: Chuck Lever <chuck.lever at oracle.com>
(cherry picked from commit 961b4b5e86bf56a2e4b567f81682defa5cba957e)
Signed-off-by: Matthew Ruffell <matthew.ruffell at canonical.com>
---
 fs/nfsd/nfs4callback.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index fef882b33740..83176d770521 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -1273,6 +1273,7 @@ static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback
 		ret = false;
 		break;
 	case -NFS4ERR_DELAY:
+		cb->cb_seq_status = 1;
 		if (!rpc_restart_call(task))
 			goto out;
 
-- 
2.45.2