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[2,01/14] NFSD: Reset cb_seq_status after NFS4ERR_DELAY

Message ID 170629111684.20612.8595881042301584822.stgit@manet.1015granger.net (mailing list archive)
State New
Headers show
Series NFSD backchannel fixes | expand

Commit Message

Chuck Lever Jan. 26, 2024, 5:45 p.m. UTC 
From: Chuck Lever <chuck.lever@oracle.com>

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@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 fs/nfsd/nfs4callback.c |    1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 926c29879c6a..43b0a34a5d5b 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -1178,6 +1178,7 @@  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;