linux-kernel - [PATCH v5 1/7] nfsd: prepare nfsd4_cb_sequence

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Message-Id: <20250207-nfsd-6-14-v5-1-f3b54fb60dc0@kernel.org>
Date: Fri, 07 Feb 2025 16:53:48 -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 1/7] nfsd: prepare nfsd4_cb_sequence_done() for error
 handling rework

There is only one case where we want to proceed with processing the rest
of the CB_COMPOUND, and that's when the cb_seq_status is 0. Make the
default return value be false, and only set it to true in that case.

Rename the "need_restart" label to "requeue", to better indicate that
it's being requeued to the workqueue.

Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
 fs/nfsd/nfs4callback.c | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index cf6d29828f4e561418b812ea2c9402929dd52bd0..79abc981e6416a88d9a81497e03e12faa3ce6d0e 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -1328,11 +1328,12 @@ static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata)
 	rpc_call_start(task);
 }
 
+/* Returns true if CB_COMPOUND processing should continue */
 static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback *cb)
 {
 	struct nfs4_client *clp = cb->cb_clp;
 	struct nfsd4_session *session = clp->cl_cb_session;
-	bool ret = true;
+	bool ret = false;
 
 	if (!clp->cl_minorversion) {
 		/*
@@ -1345,13 +1346,13 @@ static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback
 		 * handle that case here.
 		 */
 		if (RPC_SIGNALLED(task))
-			goto need_restart;
+			goto requeue;
 
 		return true;
 	}
 
 	if (cb->cb_held_slot < 0)
-		goto need_restart;
+		goto requeue;
 
 	/* This is the operation status code for CB_SEQUENCE */
 	trace_nfsd_cb_seq_status(task, cb);
@@ -1365,11 +1366,11 @@ static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback
 		 * (sequence ID, cached reply) MUST NOT change.
 		 */
 		++session->se_cb_seq_nr[cb->cb_held_slot];
+		ret = true;
 		break;
 	case -ESERVERFAULT:
 		++session->se_cb_seq_nr[cb->cb_held_slot];
 		nfsd4_mark_cb_fault(cb->cb_clp);
-		ret = false;
 		break;
 	case 1:
 		/*
@@ -1381,13 +1382,11 @@ static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback
 		fallthrough;
 	case -NFS4ERR_BADSESSION:
 		nfsd4_mark_cb_fault(cb->cb_clp);
-		ret = false;
-		goto need_restart;
+		goto requeue;
 	case -NFS4ERR_DELAY:
 		cb->cb_seq_status = 1;
 		if (!rpc_restart_call(task))
 			goto out;
-
 		rpc_delay(task, 2 * HZ);
 		return false;
 	case -NFS4ERR_BADSLOT:
@@ -1405,14 +1404,13 @@ static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback
 	nfsd41_cb_release_slot(cb);
 
 	if (RPC_SIGNALLED(task))
-		goto need_restart;
+		goto requeue;
 out:
 	return ret;
 retry_nowait:
-	if (rpc_restart_call_prepare(task))
-		ret = false;
+	rpc_restart_call_prepare(task);
 	goto out;
-need_restart:
+requeue:
 	if (!test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags)) {
 		trace_nfsd_cb_restart(clp, cb);
 		task->tk_status = 0;

-- 
2.48.1