trace: Trace posix-aio-compat.c completion and cancellation

This patch adds paio_complete() and paio_cancel() trace events to
complement the paio_submit() event.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

posix-aio-compat.c

diff --git a/posix-aio-compat.c b/posix-aio-compat.c
index fa5494d..6d4df9d 100644
--- a/posix-aio-compat.c
+++ b/posix-aio-compat.c
@@ -455,6 +455,9 @@
                 } else {
                     ret = -ret;
                 }
+
+                trace_paio_complete(acb, acb->common.opaque, ret);
+
                 /* remove the request */
                 *pacb = acb->next;
                 /* call the callback */
@@ -537,6 +540,8 @@
     struct qemu_paiocb *acb = (struct qemu_paiocb *)blockacb;
     int active = 0;
 
+    trace_paio_cancel(acb, acb->common.opaque);
+
     mutex_lock(&lock);
     if (!acb->active) {
         QTAILQ_REMOVE(&request_list, acb, node);

trace-events

diff --git a/trace-events b/trace-events
index 0a26d6a..90c9e0b 100644
--- a/trace-events
+++ b/trace-events
@@ -62,6 +62,8 @@
 
 # posix-aio-compat.c
 disable paio_submit(void *acb, void *opaque, int64_t sector_num, int nb_sectors, int type) "acb %p opaque %p sector_num %"PRId64" nb_sectors %d type %d"
+disable paio_complete(void *acb, void *opaque, int ret) "acb %p opaque %p ret %d"
+disable paio_cancel(void *acb, void *opaque) "acb %p opaque %p"
 
 # ioport.c
 disable cpu_in(unsigned int addr, unsigned int val) "addr %#x value %u"