nbd/client: Nicer trace of structured reply

It's useful to know which structured reply chunk is being processed.
Missed in commit d2febedb.
Signed-off-by: NEric Blake <eblake@redhat.com>
Message-Id: <20171108215703.9295-4-eblake@redhat.com>
Reviewed-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

nbd/client.c

@@ -979,6 +979,7 @@ static int nbd_receive_structured_reply_chunk(QIOChannel *ioc,
 int nbd_receive_reply(QIOChannel *ioc, NBDReply *reply, Error **errp)
 {
     int ret;
+    const char *type;
 
     ret = nbd_read_eof(ioc, &reply->magic, sizeof(reply->magic), errp);
     if (ret <= 0) {
@@ -1008,8 +1009,9 @@ int nbd_receive_reply(QIOChannel *ioc, NBDReply *reply, Error **errp)
         if (ret < 0) {
             break;
         }
+        type = nbd_reply_type_lookup(reply->structured.type);
         trace_nbd_receive_structured_reply_chunk(reply->structured.flags,
-                                                 reply->structured.type,
+                                                 reply->structured.type, type,
                                                  reply->structured.handle,
                                                  reply->structured.length);
         break;

nbd/trace-events

@@ -27,7 +27,7 @@ nbd_client_clear_queue(void) "Clearing NBD queue"
 nbd_client_clear_socket(void) "Clearing NBD socket"
 nbd_send_request(uint64_t from, uint32_t len, uint64_t handle, uint16_t flags, uint16_t type, const char *name) "Sending request to server: { .from = %" PRIu64", .len = %" PRIu32 ", .handle = %" PRIu64 ", .flags = 0x%" PRIx16 ", .type = %" PRIu16 " (%s) }"
 nbd_receive_simple_reply(int32_t error, const char *errname, uint64_t handle) "Got simple reply: { .error = %" PRId32 " (%s), handle = %" PRIu64" }"
-nbd_receive_structured_reply_chunk(uint16_t flags, uint16_t type, uint64_t handle, uint32_t length) "Got structured reply chunk: { flags = 0x%" PRIx16 ", type = %d, handle = %" PRIu64 ", length = %" PRIu32 " }"
+nbd_receive_structured_reply_chunk(uint16_t flags, uint16_t type, const char *name, uint64_t handle, uint32_t length) "Got structured reply chunk: { flags = 0x%" PRIx16 ", type = %d (%s), handle = %" PRIu64 ", length = %" PRIu32 " }"
 
 # nbd/common.c
 nbd_unknown_error(int err) "Squashing unexpected error %d to EINVAL"