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Date: Tue, 2 Dec 2014 13:24:20 -0500
From: Jeff Layton <jlayton@...marydata.com>
To: linux-nfs@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
Al Viro <viro@...iv.linux.org.uk>
Subject: [RFC PATCH 11/14] nfsd: add support for workqueue based service processing
Allow nfsd to create a workqueue based nfsd service if the sunrpc
pool_mode is set to "workqueue".
Signed-off-by: Jeff Layton <jlayton@...marydata.com>
---
fs/fs_struct.c | 3 +-
fs/nfsd/nfssvc.c | 77 +++++++++++++++++++++++++++++++++++++++++++++--
include/linux/fs_struct.h | 1 +
3 files changed, 78 insertions(+), 3 deletions(-)
diff --git a/fs/fs_struct.c b/fs/fs_struct.c
index 9bc08ea2f433..68985c76cd75 100644
--- a/fs/fs_struct.c
+++ b/fs/fs_struct.c
@@ -130,7 +130,7 @@ struct fs_struct *copy_fs_struct(struct fs_struct *old)
EXPORT_SYMBOL_GPL(copy_fs_struct);
/* Replace current fs struct with one given. Return a pointer to old one. */
-static struct fs_struct *
+struct fs_struct *
swap_fs_struct(struct fs_struct *new_fs)
{
struct fs_struct *old_fs;
@@ -142,6 +142,7 @@ swap_fs_struct(struct fs_struct *new_fs)
return old_fs;
}
+EXPORT_SYMBOL_GPL(swap_fs_struct);
/* Put a reference to a fs_struct. */
void put_fs_struct(struct fs_struct *fs)
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index f37bd7db2176..2c7ebced0311 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -28,6 +28,10 @@
extern struct svc_program nfsd_program;
static int nfsd(void *vrqstp);
+#if IS_ENABLED(CONFIG_SUNRPC_SVC_WORKQUEUE)
+static struct svc_serv_ops nfsd_wq_sv_ops;
+#endif
+
/*
* nfsd_mutex protects nn->nfsd_serv -- both the pointer itself and the members
* of the svc_serv struct. In particular, ->sv_nrthreads but also to some
@@ -398,10 +402,27 @@ static struct svc_serv_ops nfsd_thread_sv_ops = {
.svo_module = THIS_MODULE,
};
+#if IS_ENABLED(CONFIG_SUNRPC_SVC_WORKQUEUE)
+static struct svc_serv_ops *
+select_svc_serv_ops(void)
+{
+ if (svc_pool_map.mode == SVC_POOL_WORKQUEUE)
+ return &nfsd_wq_sv_ops;
+ return &nfsd_thread_sv_ops;
+}
+#else
+static struct svc_serv_ops *
+select_svc_serv_ops(void)
+{
+ return &nfsd_thread_sv_ops;
+}
+#endif
+
int nfsd_create_serv(struct net *net)
{
int error;
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+ struct svc_serv_ops *ops;
WARN_ON(!mutex_is_locked(&nfsd_mutex));
if (nn->nfsd_serv) {
@@ -411,8 +432,11 @@ int nfsd_create_serv(struct net *net)
if (nfsd_max_blksize == 0)
nfsd_max_blksize = nfsd_get_default_max_blksize();
nfsd_reset_versions();
- nn->nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize,
- &nfsd_thread_sv_ops);
+
+ svc_pool_map_get();
+ ops = select_svc_serv_ops();
+ nn->nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, ops);
+ svc_pool_map_put();
if (nn->nfsd_serv == NULL)
return -ENOMEM;
@@ -643,6 +667,55 @@ nfsd(void *vrqstp)
return 0;
}
+#if IS_ENABLED(CONFIG_SUNRPC_SVC_WORKQUEUE)
+/* work function for workqueue-based nfsd */
+static void
+nfsd_work(struct work_struct *work)
+{
+ int node = numa_node_id();
+ struct svc_xprt *xprt = container_of(work, struct svc_xprt, xpt_work);
+ struct net *net = xprt->xpt_net;
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+ struct svc_serv *serv = xprt->xpt_server;
+ struct svc_rqst *rqstp;
+ struct fs_struct *saved_fs;
+ int err;
+
+ rqstp = svc_rqst_alloc(serv, &serv->sv_pools[node], node);
+ if (!rqstp) {
+ /* Alloc failure. Give up for now, and requeue the work */
+ queue_work(serv->sv_wq, &xprt->xpt_work);
+ return;
+ }
+
+ rqstp->rq_xprt = xprt;
+
+ get_fs_struct(rqstp->rq_fs);
+ saved_fs = swap_fs_struct(rqstp->rq_fs);
+
+ rqstp->rq_server->sv_maxconn = nn->max_connections;
+ err = svc_wq_recv(rqstp);
+ if (err >= 0) {
+ validate_process_creds();
+ svc_process(rqstp);
+ validate_process_creds();
+ }
+
+ saved_fs = swap_fs_struct(saved_fs);
+ put_fs_struct(saved_fs);
+
+ svc_rqst_free(rqstp);
+}
+
+static struct svc_serv_ops nfsd_wq_sv_ops = {
+ .svo_shutdown = nfsd_last_thread,
+ .svo_enqueue_xprt = svc_wq_enqueue_xprt,
+ .svo_xprt_work = nfsd_work,
+ .svo_setup = svc_wq_setup,
+ .svo_module = THIS_MODULE,
+};
+#endif
+
static __be32 map_new_errors(u32 vers, __be32 nfserr)
{
if (nfserr == nfserr_jukebox && vers == 2)
diff --git a/include/linux/fs_struct.h b/include/linux/fs_struct.h
index d2b7a1942790..671c49f13396 100644
--- a/include/linux/fs_struct.h
+++ b/include/linux/fs_struct.h
@@ -20,6 +20,7 @@ extern void exit_fs(struct task_struct *);
extern void set_fs_root(struct fs_struct *, const struct path *);
extern void set_fs_pwd(struct fs_struct *, const struct path *);
extern struct fs_struct *copy_fs_struct(struct fs_struct *);
+extern struct fs_struct *swap_fs_struct(struct fs_struct *);
extern void free_fs_struct(struct fs_struct *);
extern void replace_fs_struct(struct fs_struct *);
extern int unshare_fs_struct(void);
--
2.1.0
--
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