ocfs2: Pass the locking protocol into ocfs2_cluster_connect().
Inside the stackglue, the locking protocol structure is hanging off of
the ocfs2_cluster_connection. This takes it one further; the locking
protocol is passed into ocfs2_cluster_connect(). Now different cluster
connections can have different locking protocols with distinct asts.
Note that all locking protocols have to keep their maximum protocol
version in lock-step.
With the protocol structure set in ocfs2_cluster_connect(), there is no
need for the stackglue to have a static pointer to a specific protocol
structure. We can change initialization to only pass in the maximum
protocol version.
Signed-off-by: Joel Becker <joel.becker@oracle.com>
diff --git a/fs/ocfs2/stackglue.c b/fs/ocfs2/stackglue.c
index fc184c7..31db2e8 100644
--- a/fs/ocfs2/stackglue.c
+++ b/fs/ocfs2/stackglue.c
@@ -36,7 +36,7 @@
#define OCFS2_STACK_PLUGIN_USER "user"
#define OCFS2_MAX_HB_CTL_PATH 256
-static struct ocfs2_locking_protocol *lproto;
+static struct ocfs2_protocol_version locking_max_version;
static DEFINE_SPINLOCK(ocfs2_stack_lock);
static LIST_HEAD(ocfs2_stack_list);
static char cluster_stack_name[OCFS2_STACK_LABEL_LEN + 1];
@@ -176,7 +176,7 @@
spin_lock(&ocfs2_stack_lock);
if (!ocfs2_stack_lookup(plugin->sp_name)) {
plugin->sp_count = 0;
- plugin->sp_max_proto = lproto->lp_max_version;
+ plugin->sp_max_proto = locking_max_version;
list_add(&plugin->sp_list, &ocfs2_stack_list);
printk(KERN_INFO "ocfs2: Registered cluster interface %s\n",
plugin->sp_name);
@@ -213,23 +213,23 @@
}
EXPORT_SYMBOL_GPL(ocfs2_stack_glue_unregister);
-void ocfs2_stack_glue_set_locking_protocol(struct ocfs2_locking_protocol *proto)
+void ocfs2_stack_glue_set_max_proto_version(struct ocfs2_protocol_version *max_proto)
{
struct ocfs2_stack_plugin *p;
- BUG_ON(proto == NULL);
-
spin_lock(&ocfs2_stack_lock);
- BUG_ON(active_stack != NULL);
+ if (memcmp(max_proto, &locking_max_version,
+ sizeof(struct ocfs2_protocol_version))) {
+ BUG_ON(locking_max_version.pv_major != 0);
- lproto = proto;
- list_for_each_entry(p, &ocfs2_stack_list, sp_list) {
- p->sp_max_proto = lproto->lp_max_version;
+ locking_max_version = *max_proto;
+ list_for_each_entry(p, &ocfs2_stack_list, sp_list) {
+ p->sp_max_proto = locking_max_version;
+ }
}
-
spin_unlock(&ocfs2_stack_lock);
}
-EXPORT_SYMBOL_GPL(ocfs2_stack_glue_set_locking_protocol);
+EXPORT_SYMBOL_GPL(ocfs2_stack_glue_set_max_proto_version);
/*
@@ -245,8 +245,6 @@
void *name,
unsigned int namelen)
{
- BUG_ON(lproto == NULL);
-
if (!lksb->lksb_conn)
lksb->lksb_conn = conn;
else
@@ -260,7 +258,6 @@
struct ocfs2_dlm_lksb *lksb,
u32 flags)
{
- BUG_ON(lproto == NULL);
BUG_ON(lksb->lksb_conn == NULL);
return active_stack->sp_ops->dlm_unlock(conn, lksb, flags);
@@ -314,6 +311,7 @@
int ocfs2_cluster_connect(const char *stack_name,
const char *group,
int grouplen,
+ struct ocfs2_locking_protocol *lproto,
void (*recovery_handler)(int node_num,
void *recovery_data),
void *recovery_data,
@@ -331,6 +329,12 @@
goto out;
}
+ if (memcmp(&lproto->lp_max_version, &locking_max_version,
+ sizeof(struct ocfs2_protocol_version))) {
+ rc = -EINVAL;
+ goto out;
+ }
+
new_conn = kzalloc(sizeof(struct ocfs2_cluster_connection),
GFP_KERNEL);
if (!new_conn) {
@@ -456,10 +460,10 @@
ssize_t ret = 0;
spin_lock(&ocfs2_stack_lock);
- if (lproto)
+ if (locking_max_version.pv_major)
ret = snprintf(buf, PAGE_SIZE, "%u.%u\n",
- lproto->lp_max_version.pv_major,
- lproto->lp_max_version.pv_minor);
+ locking_max_version.pv_major,
+ locking_max_version.pv_minor);
spin_unlock(&ocfs2_stack_lock);
return ret;
@@ -688,7 +692,10 @@
static void __exit ocfs2_stack_glue_exit(void)
{
- lproto = NULL;
+ memset(&locking_max_version, 0,
+ sizeof(struct ocfs2_protocol_version));
+ locking_max_version.pv_major = 0;
+ locking_max_version.pv_minor = 0;
ocfs2_sysfs_exit();
if (ocfs2_table_header)
unregister_sysctl_table(ocfs2_table_header);