[PATCH 02/11] lockd: Add /sys/fs/lockd/hosts/

Chuck Lever
2010-04-01T19:02:41Z

Add parent directory to contain directories representing entries in
lockd's host cache.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---

fs/lockd/host.c | 46 +++++++++++++++++++++++++++++++++++++++++++
fs/lockd/svc.c | 7 +++++++
include/linux/lockd/lockd.h | 2 ++
3 files changed, 55 insertions(+), 0 deletions(-)

diff --git a/fs/lockd/host.c b/fs/lockd/host.c
index 4600c20..3fbb0a5 100644
--- a/fs/lockd/host.c
+++ b/fs/lockd/host.c
@@ -45,6 +45,10 @@ struct nlm_lookup_host_info {
const int noresvport; /* use non-priv port */
};

+static struct kobject *nlm_hosts_kobj;
+static struct kobject *nlm_hosts_client_kobj;
+static struct kobject *nlm_hosts_server_kobj;
+
/*
* Hash function must work well on big- and little-endian platforms
*/
@@ -567,3 +571,45 @@ nlm_gc_hosts(void)

next_gc = jiffies + NLM_HOST_COLLECT;
}
+
+/**
+ * nlm_host_init - Called when lockd module is loaded
+ *
+ */
+int nlm_host_init(void)
+{
+ nlm_hosts_kobj = kobject_create_and_add("hosts", nlm_kobj);
+ if (nlm_hosts_kobj == NULL)
+ return -ENOMEM;
+
+ nlm_hosts_server_kobj = kobject_create_and_add("server", nlm_hosts_kobj);
+ if (nlm_hosts_server_kobj == NULL) {
+ kobject_put(nlm_hosts_kobj);
+ return -ENOMEM;
+ }
+
+ nlm_hosts_client_kobj = kobject_create_and_add("client", nlm_hosts_kobj);
+ if (nlm_hosts_client_kobj == NULL) {
+ kobject_put(nlm_hosts_server_kobj);
+ kobject_put(nlm_hosts_kobj);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+/**
+ * nlm_host_shutdown - Called when lockd module is about to be unloaded
+ *
+ */
+void nlm_host_shutdown(void)
+{
+ if (nrhosts != 0) {
+ printk(KERN_WARNING "NLM hosts remain at shutdown");
+ return;
+ }
+
+ kobject_put(nlm_hosts_client_kobj);
+ kobject_put(nlm_hosts_server_kobj);
+ kobject_put(nlm_hosts_kobj);
+}
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index 94e0d4b..acfb6d7 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -521,9 +521,15 @@ static int __init init_nlm(void)
if (!nlm_kobj)
return -ENOMEM;

+ if (nlm_host_init()) {
+ kobject_put(nlm_kobj);
+ return -ENOMEM;
+ }
+
#ifdef CONFIG_SYSCTL
nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
if (!nlm_sysctl_table) {
+ nlm_host_shutdown();
kobject_put(nlm_kobj);
return -ENOMEM;
}
@@ -539,6 +545,7 @@ static void __exit exit_nlm(void)
#ifdef CONFIG_SYSCTL
unregister_sysctl_table(nlm_sysctl_table);
#endif
+ nlm_host_shutdown();
kobject_put(nlm_kobj);
}

diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h
index 56c749e..2d89cdb 100644
--- a/include/linux/lockd/lockd.h
+++ b/include/linux/lockd/lockd.h
@@ -217,6 +217,8 @@ void nlmclnt_next_cookie(struct nlm_cookie *);
/*
* Host cache
*/
+int nlm_host_init(void);
+void nlm_host_shutdown(void);
struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap,
const size_t salen,
const unsigned short protocol,