rbd: use the higher level librbd instead of just librados

librbd stacks on top of librados to provide access
to rbd images.

Using librbd simplifies the qemu code, and allows
qemu to use new versions of the rbd format
with few (if any) changes.

Reviewed-by: Christian Brunner <chb@muc.de>
Signed-off-by: Josh Durgin <josh.durgin@dreamhost.com>
Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 8 insertions, 25 deletions

diff --git a/configure b/configure
index d38b952c86..bdacb49226 100755
--- a/configure
+++ b/configure
@@ -1917,41 +1917,24 @@ fi
 if test "$rbd" != "no" ; then
   cat > $TMPC <<EOF
 #include <stdio.h>
-#include <rados/librados.h>
-int main(void) { rados_initialize(0, NULL); return 0; }
-EOF
-  rbd_libs="-lrados"
-  if compile_prog "" "$rbd_libs" ; then
-    librados_too_old=no
-    cat > $TMPC <<EOF
-#include <stdio.h>
-#include <rados/librados.h>
-#ifndef CEPH_OSD_TMAP_SET
-#error missing CEPH_OSD_TMAP_SET
-#endif
+#include <rbd/librbd.h>
 int main(void) {
-    int (*func)(const rados_pool_t pool, uint64_t *snapid) = rados_selfmanaged_snap_create;
-    rados_initialize(0, NULL);
+    rados_t cluster;
+    rados_create(&cluster, NULL);
     return 0;
 }
 EOF
-    if compile_prog "" "$rbd_libs" ; then
-      rbd=yes
-      libs_tools="$rbd_libs $libs_tools"
-      libs_softmmu="$rbd_libs $libs_softmmu"
-    else
-      rbd=no
-      librados_too_old=yes
-    fi
+  rbd_libs="-lrbd -lrados"
+  if compile_prog "" "$rbd_libs" ; then
+    rbd=yes
+    libs_tools="$rbd_libs $libs_tools"
+    libs_softmmu="$rbd_libs $libs_softmmu"
   else
     if test "$rbd" = "yes" ; then
       feature_not_found "rados block device"
     fi
     rbd=no
   fi
-  if test "$librados_too_old" = "yes" ; then
-    echo "-> Your librados version is too old - upgrade needed to have rbd support"
-  fi
 fi
 
 ##########################################