linux-kernel - [PATCH 3/3] nfsd: move cb_need_restart flag into cb

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Message-Id: <20250218-nfsd-callback-v1-3-14f966967dd8@kernel.org>
Date: Tue, 18 Feb 2025 16:28:59 -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>
Cc: Li Lingfeng <lilingfeng3@...wei.com>, linux-nfs@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Jeff Layton <jlayton@...nel.org>
Subject: [PATCH 3/3] nfsd: move cb_need_restart flag into cb_flags

Since there is now a cb_flags word, use a new NFSD4_CALLBACK_RESTART
flag in that instead of a separate boolean.

Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
 fs/nfsd/nfs4callback.c | 10 ++++------
 fs/nfsd/state.h        |  2 +-
 fs/nfsd/trace.h        |  2 +-
 3 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 1f26c811e5f73c2e745ee68d0b6e668d1dd7c704..0b94fccbabb49097e23881ab170d38e0eeef90e2 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -1071,7 +1071,7 @@ static void nfsd4_requeue_cb(struct rpc_task *task, struct nfsd4_callback *cb)
 	if (!test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags)) {
 		trace_nfsd_cb_restart(clp, cb);
 		task->tk_status = 0;
-		cb->cb_need_restart = true;
+		set_bit(NFSD4_CALLBACK_RESTART, &cb->cb_flags);
 	}
 }
 
@@ -1475,7 +1475,7 @@ static void nfsd4_cb_release(void *calldata)
 
 	trace_nfsd_cb_rpc_release(cb->cb_clp);
 
-	if (cb->cb_need_restart)
+	if (test_bit(NFSD4_CALLBACK_RESTART, &cb->cb_flags))
 		nfsd4_queue_cb(cb);
 	else
 		nfsd41_destroy_cb(cb);
@@ -1614,12 +1614,11 @@ nfsd4_run_cb_work(struct work_struct *work)
 		return;
 	}
 
-	if (cb->cb_need_restart) {
-		cb->cb_need_restart = false;
-	} else {
+	if (!test_and_clear_bit(NFSD4_CALLBACK_RESTART, &cb->cb_flags)) {
 		if (cb->cb_ops && cb->cb_ops->prepare)
 			cb->cb_ops->prepare(cb);
 	}
+
 	cb->cb_msg.rpc_cred = clp->cl_cb_cred;
 	flags = clp->cl_minorversion ? RPC_TASK_NOCONNECT : RPC_TASK_SOFTCONN;
 	rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | flags,
@@ -1637,7 +1636,6 @@ void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp,
 	cb->cb_ops = ops;
 	INIT_WORK(&cb->cb_work, nfsd4_run_cb_work);
 	cb->cb_status = 0;
-	cb->cb_need_restart = false;
 	cb->cb_held_slot = -1;
 }
 
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index d1a8f074885aa6576843baf46de3a55de530d8d9..f75b77dceb47c0b3795df9dbf9131b8c0ce4525f 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -68,13 +68,13 @@ struct nfsd4_callback {
 	struct nfs4_client *cb_clp;
 	struct rpc_message cb_msg;
 #define NFSD4_CALLBACK_RUNNING	BIT(0)
+#define NFSD4_CALLBACK_RESTART	BIT(1)
 	unsigned long cb_flags;
 	const struct nfsd4_callback_ops *cb_ops;
 	struct work_struct cb_work;
 	int cb_seq_status;
 	int cb_status;
 	int cb_held_slot;
-	bool cb_need_restart;
 };
 
 struct nfsd4_callback_ops {
diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index 49bbd26ffcdb36173047569b8d4b41efdec4880b..00140556d50aab4bab8900fb1890cd920d5124c6 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -1613,7 +1613,7 @@ DECLARE_EVENT_CLASS(nfsd_cb_lifetime_class,
 		__entry->cl_id = clp->cl_clientid.cl_id;
 		__entry->cb = cb;
 		__entry->opcode = cb->cb_ops ? cb->cb_ops->opcode : _CB_NULL;
-		__entry->need_restart = cb->cb_need_restart;
+		__entry->need_restart = test_bit(NFSD4_CALLBACK_RESTART, &cb->cb_flags);
 		__assign_sockaddr(addr, &clp->cl_cb_conn.cb_addr,
 				  clp->cl_cb_conn.cb_addrlen)
 	),

-- 
2.48.1