RPC: Clean up RPC task structure

 Shrink the RPC task structure. Instead of storing separate pointers
 for task->tk_exit and task->tk_release, put them in a structure.

 Also pass the user data pointer as a parameter instead of passing it via
 task->tk_calldata. This enables us to nest callbacks.

 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

4 files changed, 48 insertions, 33 deletions

diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c
index c5a3364..816333c 100644
--- a/fs/lockd/clntproc.c
+++ b/fs/lockd/clntproc.c
@@ -26,11 +26,12 @@
 static int	nlmclnt_test(struct nlm_rqst *, struct file_lock *);
 static int	nlmclnt_lock(struct nlm_rqst *, struct file_lock *);
 static int	nlmclnt_unlock(struct nlm_rqst *, struct file_lock *);
-static void	nlmclnt_unlock_callback(struct rpc_task *);
-static void	nlmclnt_cancel_callback(struct rpc_task *);
 static int	nlm_stat_to_errno(u32 stat);
 static void	nlmclnt_locks_init_private(struct file_lock *fl, struct nlm_host *host);
 
+static const struct rpc_call_ops nlmclnt_unlock_ops;
+static const struct rpc_call_ops nlmclnt_cancel_ops;
+
 /*
  * Cookie counter for NLM requests
  */
@@ -399,8 +400,7 @@ in_grace_period:
 /*
  * Generic NLM call, async version.
  */
-int
-nlmsvc_async_call(struct nlm_rqst *req, u32 proc, rpc_action callback)
+int nlmsvc_async_call(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops)
 {
 	struct nlm_host	*host = req->a_host;
 	struct rpc_clnt	*clnt;
@@ -419,13 +419,12 @@ nlmsvc_async_call(struct nlm_rqst *req, u32 proc, rpc_action callback)
 	msg.rpc_proc = &clnt->cl_procinfo[proc];
 
         /* bootstrap and kick off the async RPC call */
-        status = rpc_call_async(clnt, &msg, RPC_TASK_ASYNC, callback, req);
+        status = rpc_call_async(clnt, &msg, RPC_TASK_ASYNC, tk_ops, req);
 
 	return status;
 }
 
-static int
-nlmclnt_async_call(struct nlm_rqst *req, u32 proc, rpc_action callback)
+static int nlmclnt_async_call(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops)
 {
 	struct nlm_host	*host = req->a_host;
 	struct rpc_clnt	*clnt;
@@ -448,7 +447,7 @@ nlmclnt_async_call(struct nlm_rqst *req, u32 proc, rpc_action callback)
 	/* Increment host refcount */
 	nlm_get_host(host);
         /* bootstrap and kick off the async RPC call */
-        status = rpc_call_async(clnt, &msg, RPC_TASK_ASYNC, callback, req);
+        status = rpc_call_async(clnt, &msg, RPC_TASK_ASYNC, tk_ops, req);
 	if (status < 0)
 		nlm_release_host(host);
 	return status;
@@ -664,7 +663,7 @@ nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl)
 
 	if (req->a_flags & RPC_TASK_ASYNC) {
 		status = nlmclnt_async_call(req, NLMPROC_UNLOCK,
-					nlmclnt_unlock_callback);
+					&nlmclnt_unlock_ops);
 		/* Hrmf... Do the unlock early since locks_remove_posix()
 		 * really expects us to free the lock synchronously */
 		do_vfs_lock(fl);
@@ -692,10 +691,9 @@ nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl)
 	return -ENOLCK;
 }
 
-static void
-nlmclnt_unlock_callback(struct rpc_task *task)
+static void nlmclnt_unlock_callback(struct rpc_task *task, void *data)
 {
-	struct nlm_rqst	*req = (struct nlm_rqst *) task->tk_calldata;
+	struct nlm_rqst	*req = data;
 	int		status = req->a_res.status;
 
 	if (RPC_ASSASSINATED(task))
@@ -722,6 +720,10 @@ die:
 	rpc_restart_call(task);
 }
 
+static const struct rpc_call_ops nlmclnt_unlock_ops = {
+	.rpc_call_done = nlmclnt_unlock_callback,
+};
+
 /*
  * Cancel a blocked lock request.
  * We always use an async RPC call for this in order not to hang a
@@ -750,8 +752,7 @@ nlmclnt_cancel(struct nlm_host *host, struct file_lock *fl)
 
 	nlmclnt_setlockargs(req, fl);
 
-	status = nlmclnt_async_call(req, NLMPROC_CANCEL,
-					nlmclnt_cancel_callback);
+	status = nlmclnt_async_call(req, NLMPROC_CANCEL, &nlmclnt_cancel_ops);
 	if (status < 0) {
 		nlmclnt_release_lockargs(req);
 		kfree(req);
@@ -765,10 +766,9 @@ nlmclnt_cancel(struct nlm_host *host, struct file_lock *fl)
 	return status;
 }
 
-static void
-nlmclnt_cancel_callback(struct rpc_task *task)
+static void nlmclnt_cancel_callback(struct rpc_task *task, void *data)
 {
-	struct nlm_rqst	*req = (struct nlm_rqst *) task->tk_calldata;
+	struct nlm_rqst	*req = data;
 
 	if (RPC_ASSASSINATED(task))
 		goto die;
@@ -807,6 +807,10 @@ retry_cancel:
 	rpc_delay(task, 30 * HZ);
 }
 
+static const struct rpc_call_ops nlmclnt_cancel_ops = {
+	.rpc_call_done = nlmclnt_cancel_callback,
+};
+
 /*
  * Convert an NLM status code to a generic kernel errno
  */
diff --git a/fs/lockd/svc4proc.c b/fs/lockd/svc4proc.c
index 489670e..4063095 100644
--- a/fs/lockd/svc4proc.c
+++ b/fs/lockd/svc4proc.c
@@ -22,7 +22,8 @@
 #define NLMDBG_FACILITY		NLMDBG_CLIENT
 
 static u32	nlm4svc_callback(struct svc_rqst *, u32, struct nlm_res *);
-static void	nlm4svc_callback_exit(struct rpc_task *);
+
+static const struct rpc_call_ops nlm4svc_callback_ops;
 
 /*
  * Obtain client and file from arguments
@@ -470,7 +471,6 @@ nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res  *argp,
 }
 
 
-
 /*
  * This is the generic lockd callback for async RPC calls
  */
@@ -494,7 +494,7 @@ nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_res *resp)
 	call->a_host  = host;
 	memcpy(&call->a_args, resp, sizeof(*resp));
 
-	if (nlmsvc_async_call(call, proc, nlm4svc_callback_exit) < 0)
+	if (nlmsvc_async_call(call, proc, &nlm4svc_callback_ops) < 0)
 		goto error;
 
 	return rpc_success;
@@ -504,10 +504,9 @@ nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_res *resp)
 	return rpc_system_err;
 }
 
-static void
-nlm4svc_callback_exit(struct rpc_task *task)
+static void nlm4svc_callback_exit(struct rpc_task *task, void *data)
 {
-	struct nlm_rqst	*call = (struct nlm_rqst *) task->tk_calldata;
+	struct nlm_rqst	*call = data;
 
 	if (task->tk_status < 0) {
 		dprintk("lockd: %4d callback failed (errno = %d)\n",
@@ -517,6 +516,10 @@ nlm4svc_callback_exit(struct rpc_task *task)
 	kfree(call);
 }
 
+static const struct rpc_call_ops nlm4svc_callback_ops = {
+	.rpc_call_done = nlm4svc_callback_exit,
+};
+
 /*
  * NLM Server procedures.
  */
diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
index 49f9597..87d09a0 100644
--- a/fs/lockd/svclock.c
+++ b/fs/lockd/svclock.c
@@ -41,7 +41,8 @@
 
 static void	nlmsvc_insert_block(struct nlm_block *block, unsigned long);
 static int	nlmsvc_remove_block(struct nlm_block *block);
-static void	nlmsvc_grant_callback(struct rpc_task *task);
+
+static const struct rpc_call_ops nlmsvc_grant_ops;
 
 /*
  * The list of blocked locks to retry
@@ -562,7 +563,7 @@ callback:
 	/* Call the client */
 	nlm_get_host(block->b_call.a_host);
 	if (nlmsvc_async_call(&block->b_call, NLMPROC_GRANTED_MSG,
-						nlmsvc_grant_callback) < 0)
+						&nlmsvc_grant_ops) < 0)
 		nlm_release_host(block->b_call.a_host);
 	up(&file->f_sema);
 }
@@ -575,10 +576,9 @@ callback:
  * chain once more in order to have it removed by lockd itself (which can
  * then sleep on the file semaphore without disrupting e.g. the nfs client).
  */
-static void
-nlmsvc_grant_callback(struct rpc_task *task)
+static void nlmsvc_grant_callback(struct rpc_task *task, void *data)
 {
-	struct nlm_rqst		*call = (struct nlm_rqst *) task->tk_calldata;
+	struct nlm_rqst		*call = data;
 	struct nlm_block	*block;
 	unsigned long		timeout;
 	struct sockaddr_in	*peer_addr = RPC_PEERADDR(task->tk_client);
@@ -614,6 +614,10 @@ nlmsvc_grant_callback(struct rpc_task *task)
 	nlm_release_host(call->a_host);
 }
 
+static const struct rpc_call_ops nlmsvc_grant_ops = {
+	.rpc_call_done = nlmsvc_grant_callback,
+};
+
 /*
  * We received a GRANT_RES callback. Try to find the corresponding
  * block.
diff --git a/fs/lockd/svcproc.c b/fs/lockd/svcproc.c
index 757e344..3bc437e 100644
--- a/fs/lockd/svcproc.c
+++ b/fs/lockd/svcproc.c
@@ -23,7 +23,8 @@
 #define NLMDBG_FACILITY		NLMDBG_CLIENT
 
 static u32	nlmsvc_callback(struct svc_rqst *, u32, struct nlm_res *);
-static void	nlmsvc_callback_exit(struct rpc_task *);
+
+static const struct rpc_call_ops nlmsvc_callback_ops;
 
 #ifdef CONFIG_LOCKD_V4
 static u32
@@ -518,7 +519,7 @@ nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_res *resp)
 	call->a_host  = host;
 	memcpy(&call->a_args, resp, sizeof(*resp));
 
-	if (nlmsvc_async_call(call, proc, nlmsvc_callback_exit) < 0)
+	if (nlmsvc_async_call(call, proc, &nlmsvc_callback_ops) < 0)
 		goto error;
 
 	return rpc_success;
@@ -528,10 +529,9 @@ nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_res *resp)
 	return rpc_system_err;
 }
 
-static void
-nlmsvc_callback_exit(struct rpc_task *task)
+static void nlmsvc_callback_exit(struct rpc_task *task, void *data)
 {
-	struct nlm_rqst	*call = (struct nlm_rqst *) task->tk_calldata;
+	struct nlm_rqst	*call = data;
 
 	if (task->tk_status < 0) {
 		dprintk("lockd: %4d callback failed (errno = %d)\n",
@@ -541,6 +541,10 @@ nlmsvc_callback_exit(struct rpc_task *task)
 	kfree(call);
 }
 
+static const struct rpc_call_ops nlmsvc_callback_ops = {
+	.rpc_call_done = nlmsvc_callback_exit,
+};
+
 /*
  * NLM Server procedures.
  */