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authorStanislav Kinsbursky <skinsbursky@parallels.com>2012-01-31 15:07:57 +0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-02-15 00:19:47 -0500
commita9c5d73a8d8cb37601f8c39b35b9b4128e1a5254 (patch)
tree0ae70dea76c0039e5fa0f62e12001c82a0d1647a /fs/lockd/svc.c
parentc228fa2038a33bb3b87f567482124f452e162a71 (diff)
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 <skinsbursky@parallels.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/lockd/svc.c')
-rw-r--r--fs/lockd/svc.c45
1 files changed, 42 insertions, 3 deletions
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 <linux/lockd/lockd.h>
#include <linux/nfs.h>
+#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