From a9c5d73a8d8cb37601f8c39b35b9b4128e1a5254 Mon Sep 17 00:00:00 2001 From: Stanislav Kinsbursky Date: Tue, 31 Jan 2012 15:07:57 +0400 Subject: Lockd: pernet usage counter introduced Lockd is going to be shared between network namespaces - i.e. going to be able to handle lock requests from different network namespaces. This means, that network namespace related resources have to be allocated not once (like now), but for every network namespace context, from which service is requested to operate. This patch implements Lockd per-net users accounting. New per-net counter is used to determine, when per-net resources have to be freed. Signed-off-by: Stanislav Kinsbursky Signed-off-by: Trond Myklebust --- fs/lockd/svc.c | 45 ++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 42 insertions(+), 3 deletions(-) (limited to 'fs/lockd/svc.c') diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c index cba35984dde..73c9ebf0930 100644 --- a/fs/lockd/svc.c +++ b/fs/lockd/svc.c @@ -35,6 +35,8 @@ #include #include +#include "netns.h" + #define NLMDBG_FACILITY NLMDBG_SVC #define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE) #define ALLOWED_SIGS (sigmask(SIGKILL)) @@ -50,6 +52,8 @@ static struct task_struct *nlmsvc_task; static struct svc_rqst *nlmsvc_rqst; unsigned long nlmsvc_timeout; +int lockd_net_id; + /* * These can be set at insmod time (useful for NFS as root filesystem), * and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003 @@ -316,8 +320,12 @@ int lockd_up(void) destroy_and_out: svc_destroy(serv); out: - if (!error) + if (!error) { + struct lockd_net *ln = net_generic(net, lockd_net_id); + + ln->nlmsvc_users++; nlmsvc_users++; + } mutex_unlock(&nlmsvc_mutex); return error; } @@ -500,24 +508,55 @@ module_param_call(nlm_tcpport, param_set_port, param_get_int, module_param(nsm_use_hostnames, bool, 0644); module_param(nlm_max_connections, uint, 0644); +static int lockd_init_net(struct net *net) +{ + return 0; +} + +static void lockd_exit_net(struct net *net) +{ +} + +static struct pernet_operations lockd_net_ops = { + .init = lockd_init_net, + .exit = lockd_exit_net, + .id = &lockd_net_id, + .size = sizeof(struct lockd_net), +}; + + /* * Initialising and terminating the module. */ static int __init init_nlm(void) { + int err; + #ifdef CONFIG_SYSCTL + err = -ENOMEM; nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root); - return nlm_sysctl_table ? 0 : -ENOMEM; -#else + if (nlm_sysctl_table == NULL) + goto err_sysctl; +#endif + err = register_pernet_subsys(&lockd_net_ops); + if (err) + goto err_pernet; return 0; + +err_pernet: +#ifdef CONFIG_SYSCTL + unregister_sysctl_table(nlm_sysctl_table); #endif +err_sysctl: + return err; } static void __exit exit_nlm(void) { /* FIXME: delete all NLM clients */ nlm_shutdown_hosts(); + unregister_pernet_subsys(&lockd_net_ops); #ifdef CONFIG_SYSCTL unregister_sysctl_table(nlm_sysctl_table); #endif -- cgit v1.2.3