SUNRPC: Generalize the RPC buffer release API

xprtrdma needs to allocate the Call and Reply buffers separately.
TBH, the reliance on using a single buffer for the pair of XDR
buffers is transport implementation-specific.

Instead of passing just the rq_buffer into the buf_free method, pass
the task structure and let buf_free take care of freeing both
XDR buffers at once.

There's a micro-optimization here. In the common case, both
xprt_release and the transport's buf_free method were checking if
rq_buffer was NULL. Now the check is done only once per RPC.

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

1 files changed, 4 insertions, 6 deletions

diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
index b964d40b259b..6690ebc774ed 100644
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -896,18 +896,16 @@ int rpc_malloc(struct rpc_task *task)
 EXPORT_SYMBOL_GPL(rpc_malloc);
 
 /**
- * rpc_free - free buffer allocated via rpc_malloc
- * @buffer: buffer to free
+ * rpc_free - free RPC buffer resources allocated via rpc_malloc
+ * @task: RPC task
  *
  */
-void rpc_free(void *buffer)
+void rpc_free(struct rpc_task *task)
 {
+	void *buffer = task->tk_rqstp->rq_buffer;
 	size_t size;
 	struct rpc_buffer *buf;
 
-	if (!buffer)
-		return;
-
 	buf = container_of(buffer, struct rpc_buffer, data);
 	size = buf->len;