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Commit bb6aeba7 authored by Trond Myklebust's avatar Trond Myklebust Committed by Anna Schumaker
Browse files

NFSv4.x: Switch to using svc_set_num_threads() to manage the callback threads 



This will allow us to bump the number of callback threads at will.

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
parent 3b01c11e

fs/nfs/callback.c

+13 −66
Original line number Diff line number Diff line
@@ -31,8 +31,6 @@ 
struct nfs_callback_data {

	unsigned int users;

	struct svc_serv *serv;

	struct svc_rqst *rqst;

	struct task_struct *task;

};



static struct nfs_callback_data nfs_callback_info[NFS4_MAX_MINOR_VERSION + 1];
@@ -89,15 +87,6 @@ nfs4_callback_svc(void *vrqstp) 
	return 0;

}



/*

 * Prepare to bring up the NFSv4 callback service

 */

static struct svc_rqst *

nfs4_callback_up(struct svc_serv *serv)

{

	return svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);

}



#if defined(CONFIG_NFS_V4_1)

/*

 * The callback service for NFSv4.1 callbacks
@@ -139,19 +128,6 @@ nfs41_callback_svc(void *vrqstp) 
	return 0;

}



/*

 * Bring up the NFSv4.1 callback service

 */

static struct svc_rqst *

nfs41_callback_up(struct svc_serv *serv)

{

	struct svc_rqst *rqstp;



	rqstp = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);

	dprintk("--> %s return %d\n", __func__, PTR_ERR_OR_ZERO(rqstp));

	return rqstp;

}



static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,

		struct svc_serv *serv)

{
@@ -163,12 +139,6 @@ static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt, 
		xprt->bc_serv = serv;

}

#else

static struct svc_rqst *

nfs41_callback_up(struct svc_serv *serv)

{

	return ERR_PTR(-ENOTSUPP);

}



static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,

		struct svc_serv *serv)

{
@@ -178,42 +148,19 @@ static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt, 
static int nfs_callback_start_svc(int minorversion, struct rpc_xprt *xprt,

				  struct svc_serv *serv)

{

	struct svc_rqst *rqstp;

	struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];

	const int nrservs = NFS4_NR_CALLBACK_THREADS;

	int ret;



	nfs_callback_bc_serv(minorversion, xprt, serv);



	if (cb_info->task)

	if (serv->sv_nrthreads-1 == nrservs)

		return 0;



	switch (minorversion) {

	case 0:

		/* v4.0 callback setup */

		rqstp = nfs4_callback_up(serv);

		break;

	default:

		rqstp = nfs41_callback_up(serv);

	}



	if (IS_ERR(rqstp))

		return PTR_ERR(rqstp);



	svc_sock_update_bufs(serv);



	cb_info->rqst = rqstp;

	cb_info->task = kthread_create(serv->sv_ops->svo_function,

				    cb_info->rqst,

				    "nfsv4.%u-svc", minorversion);

	if (IS_ERR(cb_info->task)) {

		ret = PTR_ERR(cb_info->task);

		svc_exit_thread(cb_info->rqst);

		cb_info->rqst = NULL;

		cb_info->task = NULL;

	ret = serv->sv_ops->svo_setup(serv, NULL, nrservs);

	if (ret) {

		serv->sv_ops->svo_setup(serv, NULL, 0);

		return ret;

	}

	rqstp->rq_task = cb_info->task;

	wake_up_process(cb_info->task);

	dprintk("nfs_callback_up: service started\n");

	return 0;

}
@@ -270,12 +217,14 @@ static int nfs_callback_up_net(int minorversion, struct svc_serv *serv, 
static struct svc_serv_ops nfs40_cb_sv_ops = {

	.svo_function		= nfs4_callback_svc,

	.svo_enqueue_xprt	= svc_xprt_do_enqueue,

	.svo_setup		= svc_set_num_threads,

	.svo_module		= THIS_MODULE,

};

#if defined(CONFIG_NFS_V4_1)

static struct svc_serv_ops nfs41_cb_sv_ops = {

	.svo_function		= nfs41_callback_svc,

	.svo_enqueue_xprt	= svc_xprt_do_enqueue,

	.svo_setup		= svc_set_num_threads,

	.svo_module		= THIS_MODULE,

};
@@ -394,20 +343,18 @@ int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt) 
void nfs_callback_down(int minorversion, struct net *net)

{

	struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];

	struct svc_serv *serv;



	mutex_lock(&nfs_callback_mutex);

	nfs_callback_down_net(minorversion, cb_info->serv, net);

	serv = cb_info->serv;

	nfs_callback_down_net(minorversion, serv, net);

	cb_info->users--;

	if (cb_info->users == 0) {

		if (cb_info->task != NULL) {

			kthread_stop(cb_info->task);

			dprintk("nfs_callback_down: service stopped\n");

		}

		svc_exit_thread(cb_info->rqst);

		svc_get(serv);

		serv->sv_ops->svo_setup(serv, NULL, 0);

		svc_destroy(serv);

		dprintk("nfs_callback_down: service destroyed\n");

		cb_info->serv = NULL;

		cb_info->rqst = NULL;

		cb_info->task = NULL;

	}

	mutex_unlock(&nfs_callback_mutex);

}

fs/nfs/callback.h

+2 −0
Original line number Diff line number Diff line
@@ -198,6 +198,8 @@ extern void nfs_callback_down(int minorversion, struct net *net); 
#define NFS41_BC_MIN_CALLBACKS 1

#define NFS41_BC_MAX_CALLBACKS 1



#define NFS4_NR_CALLBACK_THREADS 1



extern unsigned int nfs_callback_set_tcpport;



#endif /* __LINUX_FS_NFS_CALLBACK_H */