linux-kernel - [PATCH 2/7] SUNRPC: spin svc_rqst initialization to its own function

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Message-Id: <1198009182-27895-3-git-send-email-jlayton@redhat.com>
Date:	Tue, 18 Dec 2007 15:19:37 -0500
From:	Jeff Layton <jlayton@...hat.com>
To:	linux-nfs@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, nfsv4@...ux-nfs.org
Subject: [PATCH 2/7] SUNRPC: spin svc_rqst initialization to its own function

Move the initialzation in __svc_create_thread that happens prior to
thread creation to a new function. Export the function so that when
we replace __svc_create_thread with a kthread version, callers will
have complete control over this initialization.

Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
 include/linux/sunrpc/svc.h |    2 ++
 net/sunrpc/sunrpc_syms.c   |    1 +
 net/sunrpc/svc.c           |   42 ++++++++++++++++++++++++++++++------------
 3 files changed, 33 insertions(+), 12 deletions(-)

diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index 8531a70..19483fe 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -382,6 +382,8 @@ struct svc_procedure {
  */
 struct svc_serv *  svc_create(struct svc_program *, unsigned int,
 			      void (*shutdown)(struct svc_serv*));
+struct svc_rqst *  svc_prepare_thread(struct svc_serv *serv,
+					struct svc_pool *pool);
 int		   svc_create_thread(svc_thread_fn, struct svc_serv *);
 void		   svc_exit_thread(struct svc_rqst *);
 struct svc_serv *  svc_create_pooled(struct svc_program *, unsigned int,
diff --git a/net/sunrpc/sunrpc_syms.c b/net/sunrpc/sunrpc_syms.c
index 33d89e8..27bb185 100644
--- a/net/sunrpc/sunrpc_syms.c
+++ b/net/sunrpc/sunrpc_syms.c
@@ -63,6 +63,7 @@ EXPORT_SYMBOL(put_rpccred);
 
 /* RPC server stuff */
 EXPORT_SYMBOL(svc_create);
+EXPORT_SYMBOL(svc_prepare_thread);
 EXPORT_SYMBOL(svc_create_thread);
 EXPORT_SYMBOL(svc_create_pooled);
 EXPORT_SYMBOL(svc_set_num_threads);
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index 9696ae7..854e8ec 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -538,23 +538,14 @@ svc_release_buffer(struct svc_rqst *rqstp)
 			put_page(rqstp->rq_pages[i]);
 }
 
-/*
- * Create a thread in the given pool.  Caller must hold BKL.
- * On a NUMA or SMP machine, with a multi-pool serv, the thread
- * will be restricted to run on the cpus belonging to the pool.
- */
-static int
-__svc_create_thread(svc_thread_fn func, struct svc_serv *serv,
-		    struct svc_pool *pool)
+struct svc_rqst *
+svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool)
 {
 	struct svc_rqst	*rqstp;
-	int		error = -ENOMEM;
-	int		have_oldmask = 0;
-	cpumask_t	oldmask;
 
 	rqstp = kzalloc(sizeof(*rqstp), GFP_KERNEL);
 	if (!rqstp)
-		goto out;
+		goto out_enomem;
 
 	init_waitqueue_head(&rqstp->rq_wait);
 
@@ -570,6 +561,33 @@ __svc_create_thread(svc_thread_fn func, struct svc_serv *serv,
 	spin_unlock_bh(&pool->sp_lock);
 	rqstp->rq_server = serv;
 	rqstp->rq_pool = pool;
+	return rqstp;
+
+out_thread:
+	svc_exit_thread(rqstp);
+out_enomem:
+	return ERR_PTR(-ENOMEM);
+}
+
+/*
+ * Create a thread in the given pool.  Caller must hold BKL.
+ * On a NUMA or SMP machine, with a multi-pool serv, the thread
+ * will be restricted to run on the cpus belonging to the pool.
+ */
+static int
+__svc_create_thread(svc_thread_fn func, struct svc_serv *serv,
+		    struct svc_pool *pool)
+{
+	struct svc_rqst	*rqstp;
+	int		error = -ENOMEM;
+	int		have_oldmask = 0;
+	cpumask_t	oldmask;
+
+	rqstp = svc_prepare_thread(serv, pool);
+	if (IS_ERR(rqstp)) {
+		error = PTR_ERR(rqstp);
+		goto out;
+	}
 
 	if (serv->sv_nrpools > 1)
 		have_oldmask = svc_pool_map_set_cpumask(current, pool->sp_id,
-- 
1.5.3.3

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