From a4c4c3460bd556cdb0aadc71d006556530144d01 Mon Sep 17 00:00:00 2001
From: vears91 <templar996@gmail.com>
Date: Mon, 27 Jun 2016 16:38:34 +0300
Subject: [PATCH] Add support for blkin tracing in rbd engine

Add configure support to disable or enable fio rbd engine with blkin, and use rbd_aio_write_traced and rbd_aio_read_traced to pass the trace information to librbd if fio was compiled with blkin.

Signed-off-by: Victor Araujo <ve.ar91@gmail.com>
---
 configure     | 33 +++++++++++++++++++++++++++++++++
 engines/rbd.c | 16 ++++++++++++++++
 2 files changed, 49 insertions(+)

diff --git a/configure b/configure
index 5f6bca3b..93c37200 100755
--- a/configure
+++ b/configure
@@ -166,6 +166,8 @@ for opt do
   ;;
   --disable-rbd) disable_rbd="yes"
   ;;
+  --disable-rbd-blkin) disable_rbd_blkin="yes"
+  ;;
   --disable-gfapi) disable_gfapi="yes"
   ;;
   --enable-libhdfs) libhdfs="yes"
@@ -1333,6 +1335,34 @@ fi
 echo "rbd_invalidate_cache          $rbd_inval"
 fi
 
+##########################################
+# check for blkin
+rbd_blkin="no"
+cat > $TMPC << EOF
+#include <rbd/librbd.h>
+#include <zipkin_c.h>
+
+int main(int argc, char **argv)
+{
+  int r;
+  struct blkin_trace_info t_info;
+  blkin_init_trace_info(&t_info);
+  rbd_completion_t completion;
+  rbd_image_t image;
+  uint64_t off;
+  size_t len;
+  const char *buf;
+  r = rbd_aio_write_traced(image, off, len, buf, completion, &t_info);
+  return 0;
+}
+EOF
+if test "$disable_rbd" != "yes" && test "$disable_rbd_blkin" != "yes" \
+ && compile_prog "" "-lrbd -lrados -lblkin" "rbd_blkin"; then
+  LIBS="-lblkin $LIBS"
+  rbd_blkin="yes"
+fi
+echo "rbd blkin tracing             $rbd_blkin"
+
 ##########################################
 # Check whether we have setvbuf
 setvbuf="no"
@@ -1778,6 +1808,9 @@ fi
 if test "$rbd_inval" = "yes" ; then
   output_sym "CONFIG_RBD_INVAL"
 fi
+if test "$rbd_blkin" = "yes" ; then
+  output_sym "CONFIG_RBD_BLKIN"
+fi
 if test "$setvbuf" = "yes" ; then
   output_sym "CONFIG_SETVBUF"
 fi
diff --git a/engines/rbd.c b/engines/rbd.c
index 87ed360f..552e5c57 100644
--- a/engines/rbd.c
+++ b/engines/rbd.c
@@ -9,12 +9,16 @@
 
 #include "../fio.h"
 #include "../optgroup.h"
+#ifdef CONFIG_RBD_BLKIN
+#include <zipkin_c.h>
+#endif
 
 struct fio_rbd_iou {
 	struct io_u *io_u;
 	rbd_completion_t completion;
 	int io_seen;
 	int io_complete;
+	struct blkin_trace_info info;
 };
 
 struct rbd_data {
@@ -378,16 +382,28 @@ static int fio_rbd_queue(struct thread_data *td, struct io_u *io_u)
 	}
 
 	if (io_u->ddir == DDIR_WRITE) {
+#ifdef CONFIG_RBD_BLKIN
+		blkin_init_trace_info(&fri->info);
+		r = rbd_aio_write_traced(rbd->image, io_u->offset, io_u->xfer_buflen,
+					 io_u->xfer_buf, fri->completion, &fri->info);
+#else
 		r = rbd_aio_write(rbd->image, io_u->offset, io_u->xfer_buflen,
 					 io_u->xfer_buf, fri->completion);
+#endif
 		if (r < 0) {
 			log_err("rbd_aio_write failed.\n");
 			goto failed_comp;
 		}
 
 	} else if (io_u->ddir == DDIR_READ) {
+#ifdef CONFIG_RBD_BLKIN
+		blkin_init_trace_info(&fri->info);
+		r = rbd_aio_read_traced(rbd->image, io_u->offset, io_u->xfer_buflen,
+					io_u->xfer_buf, fri->completion, &fri->info);
+#else
 		r = rbd_aio_read(rbd->image, io_u->offset, io_u->xfer_buflen,
 					io_u->xfer_buf, fri->completion);
+#endif
 
 		if (r < 0) {
 			log_err("rbd_aio_read failed.\n");
-- 
2.25.1