nfsd/sunrpc: abstract out svc_set_num_threads to sv_ops

This change “nfsd/sunrpc: abstract out svc_set_num_threads to sv_ops” in Linux kernel is authored by Jeff Layton <jlayton [at] primarydata.com> on Mon Jun 8 12:08:33 2015 -0700.

nfsd/sunrpc: abstract out svc_set_num_threads to sv_ops

Add an operation that will do setup of the service. In the case of a
classic thread-based service that means starting up threads. In the case
of a workqueue-based service, the setup will do something different.

Signed-off-by: Shirley Ma <shirley.ma@oracle.com>
Acked-by: Jeff Layton <jlayton@primarydata.com>
Tested-by: Shirley Ma <shirliey.ma@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

This Linux change may have been applied to various maintained Linux releases and you can find Linux releases including commit 598e235.

There are 11 lines of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

 fs/nfsd/nfssvc.c           | 8 +++++---
 include/linux/sunrpc/svc.h | 3 +++
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index d8b9b4c..ad4e237 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -395,6 +395,7 @@ static int nfsd_get_default_max_blksize(void)
 	.svo_shutdown		= nfsd_last_thread,
 	.svo_function		= nfsd,
 	.svo_enqueue_xprt	= svc_xprt_do_enqueue,
+	.svo_setup		= svc_set_num_threads,
 	.svo_module		= THIS_MODULE,
 };
 
@@ -507,8 +508,8 @@ int nfsd_set_nrthreads(int n, int *nthreads, struct net *net)
 	/* apply the new numbers */
 	svc_get(nn->nfsd_serv);
 	for (i = 0; i < n; i++) {
-		err = svc_set_num_threads(nn->nfsd_serv, &nn->nfsd_serv->sv_pools[i],
-				    	  nthreads[i]);
+		err = nn->nfsd_serv->sv_ops->svo_setup(nn->nfsd_serv,
+				&nn->nfsd_serv->sv_pools[i], nthreads[i]);
 		if (err)
 			break;
 	}
@@ -547,7 +548,8 @@ int nfsd_set_nrthreads(int n, int *nthreads, struct net *net)
 	error = nfsd_startup_net(nrservs, net);
 	if (error)
 		goto out_destroy;
-	error = svc_set_num_threads(nn->nfsd_serv, NULL, nrservs);
+	error = nn->nfsd_serv->sv_ops->svo_setup(nn->nfsd_serv,
+			NULL, nrservs);
 	if (error)
 		goto out_shutdown;
 	/* We are holding a reference to nn->nfsd_serv which
diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index 97609d0..fd5bb99 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -61,6 +61,9 @@ struct svc_serv_ops {
 	/* queue up a transport for servicing */
 	void		(*svo_enqueue_xprt)(struct svc_xprt *);
 
+	/* set up thread (or whatever) execution context */
+	int		(*svo_setup)(struct svc_serv *, struct svc_pool *, int);
+
 	/* optional module to count when adding threads (pooled svcs only) */
 	struct module	*svo_module;
 };

The commit for this change in Linux stable tree is 598e235 (patch).

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