From bb6aeba736ba9fd4d9569eec4bc3f7aecb42162a Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Mon, 29 Aug 2016 20:03:51 -0400 Subject: [PATCH] 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: Trond Myklebust Signed-off-by: Anna Schumaker --- fs/nfs/callback.c | 79 ++++++++--------------------------------------- fs/nfs/callback.h | 2 ++ 2 files changed, 15 insertions(+), 66 deletions(-) diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c index b125f02ddf8b..b91c49f4670b 100644 --- a/fs/nfs/callback.c +++ b/fs/nfs/callback.c @@ -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 @@ err_bind: 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 @@ err_start: 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); } diff --git a/fs/nfs/callback.h b/fs/nfs/callback.h index 5fe1cecbf9f0..14bd863495db 100644 --- a/fs/nfs/callback.h +++ b/fs/nfs/callback.h @@ -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 */ -- 2.20.1