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From: Chuck Lever <chuck.lever@oracle.com>
To: bfields@fieldses.org
Cc: linux-nfs@vger.kernel.org
Subject: [PATCH 02/29] lockd: Create a simplified .vs_dispatch method for NLM requests
Date: Thu, 03 Jun 2021 16:50:46 -0400	[thread overview]
Message-ID: <162275344613.32691.16128075802320636795.stgit@klimt.1015granger.net> (raw)
In-Reply-To: <162275337584.32691.3943139351165347555.stgit@klimt.1015granger.net>

To enable xdr_stream-based encoding and decoding, create a bespoke
RPC dispatch function for the lockd service.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 fs/lockd/svc.c |   43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index 1a639e34847d..2de048f80eb8 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -766,6 +766,46 @@ static void __exit exit_nlm(void)
 module_init(init_nlm);
 module_exit(exit_nlm);
 
+/**
+ * nlmsvc_dispatch - Process an NLM Request
+ * @rqstp: incoming request
+ * @statp: pointer to location of accept_stat field in RPC Reply buffer
+ *
+ * Return values:
+ *  %0: Processing complete; do not send a Reply
+ *  %1: Processing complete; send Reply in rqstp->rq_res
+ */
+static int nlmsvc_dispatch(struct svc_rqst *rqstp, __be32 *statp)
+{
+	const struct svc_procedure *procp = rqstp->rq_procinfo;
+	struct kvec *argv = rqstp->rq_arg.head;
+	struct kvec *resv = rqstp->rq_res.head;
+
+	svcxdr_init_decode(rqstp);
+	if (!procp->pc_decode(rqstp, argv->iov_base))
+		goto out_decode_err;
+
+	*statp = procp->pc_func(rqstp);
+	if (*statp == rpc_drop_reply)
+		return 0;
+	if (*statp != rpc_success)
+		return 1;
+
+	svcxdr_init_encode(rqstp);
+	if (!procp->pc_encode(rqstp, resv->iov_base + resv->iov_len))
+		goto out_encode_err;
+
+	return 1;
+
+out_decode_err:
+	*statp = rpc_garbage_args;
+	return 1;
+
+out_encode_err:
+	*statp = rpc_system_err;
+	return 1;
+}
+
 /*
  * Define NLM program and procedures
  */
@@ -775,6 +815,7 @@ static const struct svc_version	nlmsvc_version1 = {
 	.vs_nproc	= 17,
 	.vs_proc	= nlmsvc_procedures,
 	.vs_count	= nlmsvc_version1_count,
+	.vs_dispatch	= nlmsvc_dispatch,
 	.vs_xdrsize	= NLMSVC_XDRSIZE,
 };
 static unsigned int nlmsvc_version3_count[24];
@@ -783,6 +824,7 @@ static const struct svc_version	nlmsvc_version3 = {
 	.vs_nproc	= 24,
 	.vs_proc	= nlmsvc_procedures,
 	.vs_count	= nlmsvc_version3_count,
+	.vs_dispatch	= nlmsvc_dispatch,
 	.vs_xdrsize	= NLMSVC_XDRSIZE,
 };
 #ifdef CONFIG_LOCKD_V4
@@ -792,6 +834,7 @@ static const struct svc_version	nlmsvc_version4 = {
 	.vs_nproc	= 24,
 	.vs_proc	= nlmsvc_procedures4,
 	.vs_count	= nlmsvc_version4_count,
+	.vs_dispatch	= nlmsvc_dispatch,
 	.vs_xdrsize	= NLMSVC_XDRSIZE,
 };
 #endif



  parent reply	other threads:[~2021-06-03 20:50 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-03 20:50 [PATCH 00/29] XDR overhaul for server-side lockd Chuck Lever
2021-06-03 20:50 ` [PATCH 01/29] lockd: Remove stale comments Chuck Lever
2021-06-03 20:50 ` Chuck Lever [this message]
2021-06-03 20:50 ` [PATCH 03/29] lockd: Common NLM XDR helpers Chuck Lever
2021-06-03 20:50 ` [PATCH 04/29] lockd: Update the NLMv1 void argument decoder to use struct xdr_stream Chuck Lever
2021-06-03 20:51 ` [PATCH 05/29] lockd: Update the NLMv1 TEST arguments " Chuck Lever
2021-06-03 20:51 ` [PATCH 06/29] lockd: Update the NLMv1 LOCK " Chuck Lever
2021-06-03 20:51 ` [PATCH 07/29] lockd: Update the NLMv1 CANCEL " Chuck Lever
2021-06-03 20:51 ` [PATCH 08/29] lockd: Update the NLMv1 UNLOCK " Chuck Lever
2021-06-03 20:51 ` [PATCH 09/29] lockd: Update the NLMv1 nlm_res " Chuck Lever
2021-06-03 20:51 ` [PATCH 10/29] lockd: Update the NLMv1 SM_NOTIFY " Chuck Lever
2021-06-03 20:51 ` [PATCH 11/29] lockd: Update the NLMv1 SHARE " Chuck Lever
2021-06-03 20:51 ` [PATCH 12/29] lockd: Update the NLMv1 FREE_ALL " Chuck Lever
2021-06-03 20:51 ` [PATCH 13/29] lockd: Update the NLMv1 void results encoder " Chuck Lever
2021-06-03 20:51 ` [PATCH 14/29] lockd: Update the NLMv1 TEST " Chuck Lever
2021-06-03 20:52 ` [PATCH 15/29] lockd: Update the NLMv1 nlm_res " Chuck Lever
2021-06-03 20:52 ` [PATCH 16/29] lockd: Update the NLMv1 SHARE " Chuck Lever
2021-06-03 20:52 ` [PATCH 17/29] lockd: Update the NLMv4 void arguments decoder " Chuck Lever
2021-06-03 20:52 ` [PATCH 18/29] lockd: Update the NLMv4 TEST " Chuck Lever
2021-06-03 20:52 ` [PATCH 19/29] lockd: Update the NLMv4 LOCK " Chuck Lever
2021-06-03 20:52 ` [PATCH 20/29] lockd: Update the NLMv4 CANCEL " Chuck Lever
2021-06-03 20:52 ` [PATCH 21/29] lockd: Update the NLMv4 UNLOCK " Chuck Lever
2021-06-03 20:52 ` [PATCH 22/29] lockd: Update the NLMv4 nlm_res " Chuck Lever
2021-06-03 20:52 ` [PATCH 23/29] lockd: Update the NLMv4 SM_NOTIFY " Chuck Lever
2021-06-03 20:52 ` [PATCH 24/29] lockd: Update the NLMv4 SHARE " Chuck Lever
2021-06-03 20:53 ` [PATCH 25/29] lockd: Update the NLMv4 FREE_ALL " Chuck Lever
2021-06-03 20:53 ` [PATCH 26/29] lockd: Update the NLMv4 void results encoder " Chuck Lever
2021-06-03 20:53 ` [PATCH 27/29] lockd: Update the NLMv4 TEST " Chuck Lever
2021-06-03 20:53 ` [PATCH 28/29] lockd: Update the NLMv4 nlm_res " Chuck Lever
2021-06-03 20:53 ` [PATCH 29/29] lockd: Update the NLMv4 SHARE " Chuck Lever
2021-06-16 14:53 ` [PATCH 00/29] XDR overhaul for server-side lockd J. Bruce Fields

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