linux-kernel - [PATCH v5 3/7] nfsd: only check RPC_SIGNALLED() when restarting rpc

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Message-Id: <20250207-nfsd-6-14-v5-3-f3b54fb60dc0@kernel.org>
Date: Fri, 07 Feb 2025 16:53:50 -0500
From: Jeff Layton <jlayton@...nel.org>
To: Chuck Lever <chuck.lever@...cle.com>, Neil Brown <neilb@...e.de>, 
 Olga Kornievskaia <okorniev@...hat.com>, Dai Ngo <Dai.Ngo@...cle.com>, 
 Tom Talpey <tom@...pey.com>, "J. Bruce Fields" <bfields@...ldses.org>
Cc: linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Jeff Layton <jlayton@...nel.org>
Subject: [PATCH v5 3/7] nfsd: only check RPC_SIGNALLED() when restarting
 rpc_task

nfsd4_cb_sequence_done() currently checks RPC_SIGNALLED() when
processing the compound and releasing the slot. If RPC_SIGNALLED()
returns true, then that means that the client is going to be torn down.

Don't check RPC_SIGNALLED() after processing a successful reply.
Instead, only check that before restarting the rpc_task. If that returns
true, then requeue the callback.

Also, handle rpc_restart_call() and rpc_restart_call_prepare() failures
correctly, by requeueing the callback.

Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
 fs/nfsd/nfs4callback.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index bb5356e8713a8840bb714859618ff88130825efd..1e601075fac02bd5f01ff89d9252ab23d08c4fd9 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -1385,8 +1385,8 @@ static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback
 		goto requeue;
 	case -NFS4ERR_DELAY:
 		cb->cb_seq_status = 1;
-		if (!rpc_restart_call(task))
-			goto out;
+		if (RPC_SIGNALLED(task) || !rpc_restart_call(task))
+			goto requeue;
 		rpc_delay(task, 2 * HZ);
 		return false;
 	case -NFS4ERR_BADSLOT:
@@ -1402,14 +1402,16 @@ static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback
 	}
 	trace_nfsd_cb_free_slot(task, cb);
 	nfsd41_cb_release_slot(cb);
-
-	if (RPC_SIGNALLED(task))
-		goto requeue;
-out:
 	return ret;
 retry_nowait:
-	rpc_restart_call_prepare(task);
-	goto out;
+	/*
+	 * RPC_SIGNALLED() means that the rpc_client is being torn down and
+	 * (possibly) recreated. Requeue the call in that case.
+	 */
+	if (!RPC_SIGNALLED(task)) {
+		if (rpc_restart_call_prepare(task))
+			return false;
+	}
 requeue:
 	nfsd41_cb_release_slot(cb);
 	if (!test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags)) {

-- 
2.48.1