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>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c
index 4e1c0123b45d..749eb5328cb0 100644
--- a/fs/lockd/clntproc.c
+++ b/fs/lockd/clntproc.c
@@ -221,6 +221,7 @@ struct nlm_rqst *nlm_alloc_call(struct nlm_host *host)
         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 @@ struct nlm_rqst *nlm_alloc_call(struct nlm_host *host)
 
 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);