NLM/lockd: Add a reference counter to struct nlm_rqst
When we replace the existing synchronous RPC calls with asynchronous calls,
the reference count will be needed in order to allow us to examine the
result of the RPC call.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c
index 4e1c012..749eb53 100644
--- a/fs/lockd/clntproc.c
+++ b/fs/lockd/clntproc.c
@@ -221,6 +221,7 @@
for(;;) {
call = kzalloc(sizeof(*call), GFP_KERNEL);
if (call != NULL) {
+ atomic_set(&call->a_count, 1);
locks_init_lock(&call->a_args.lock.fl);
locks_init_lock(&call->a_res.lock.fl);
call->a_host = host;
@@ -237,6 +238,8 @@
void nlm_release_call(struct nlm_rqst *call)
{
+ if (!atomic_dec_and_test(&call->a_count))
+ return;
nlm_release_host(call->a_host);
nlmclnt_release_lockargs(call);
kfree(call);
diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h
index acf39e1..94649a8 100644
--- a/include/linux/lockd/lockd.h
+++ b/include/linux/lockd/lockd.h
@@ -91,6 +91,7 @@
*/
#define NLMCLNT_OHSIZE ((__NEW_UTS_LEN) + 10u)
struct nlm_rqst {
+ atomic_t a_count;
unsigned int a_flags; /* initial RPC task flags */
struct nlm_host * a_host; /* host handle */
struct nlm_args a_args; /* arguments */