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Date: Thu, 26 Apr 2012 19:55:56 +0400 From: Stanislav Kinsbursky <skinsbursky@...allels.com> To: Trond.Myklebust@...app.com Cc: linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org, devel@...nvz.org Subject: [PATCH 09/10] NFS; callback per-net usage counting introduced This patch also introduces refcount-aware nfs_callback_down_net() wrapper for svc_shutdown_net(). Signed-off-by: Stanislav Kinsbursky <skinsbursky@...allels.com> --- fs/nfs/callback.c | 19 +++++++++++++++++-- fs/nfs/netns.h | 1 + 2 files changed, 18 insertions(+), 2 deletions(-) diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c index 3f1b5d1..1f814b0 100644 --- a/fs/nfs/callback.c +++ b/fs/nfs/callback.c @@ -285,10 +285,25 @@ static int nfs_callback_start_svc(int minorversion, struct rpc_xprt *xprt, return 0; } +static void nfs_callback_down_net(u32 minorversion, struct svc_serv *serv, struct net *net) +{ + struct nfs_net *nn = net_generic(net, nfs_net_id); + + if (--nn->cb_users[minorversion]) + return; + + dprintk("NFS: destroy per-net callback data; net=%p\n", net); + svc_shutdown_net(serv, net); +} + static int nfs_callback_up_net(int minorversion, struct svc_serv *serv, struct net *net) { + struct nfs_net *nn = net_generic(net, nfs_net_id); int ret; + if (nn->cb_users[minorversion]++) + return 0; + dprintk("NFS: create per-net callback data; net=%p\n", net); ret = svc_bind(serv, net); @@ -391,7 +406,7 @@ err_create: return ret; err_start: - svc_shutdown_net(serv, net); + nfs_callback_down_net(minorversion, serv, net); dprintk("NFS: Couldn't create server thread; err = %d\n", ret); goto err_net; } @@ -404,10 +419,10 @@ void nfs_callback_down(int minorversion, struct net *net) struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion]; mutex_lock(&nfs_callback_mutex); + nfs_callback_down_net(minorversion, cb_info->serv, net); cb_info->users--; if (cb_info->users == 0 && cb_info->task != NULL) { kthread_stop(cb_info->task); - svc_shutdown_net(cb_info->serv, net); svc_exit_thread(cb_info->rqst); cb_info->serv = NULL; cb_info->rqst = NULL; diff --git a/fs/nfs/netns.h b/fs/nfs/netns.h index bd72a55..db3e495 100644 --- a/fs/nfs/netns.h +++ b/fs/nfs/netns.h @@ -20,6 +20,7 @@ struct nfs_net { struct idr cb_ident_idr; /* Protected by nfs_client_lock */ unsigned short nfs_callback_tcpport; unsigned short nfs_callback_tcpport6; + int cb_users[NFS4_MAX_MINOR_VERSION + 1]; #endif spinlock_t nfs_client_lock; }; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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