Currently for block exports we report empty blk names. That's not good.
Let's try to find corresponding block export and report its id.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
---
 block.c                     |  4 ++++
 block/export/export.c       | 13 +++++++++++++
 include/block/export.h      |  1 +
 stubs/blk-exp-find-by-blk.c |  9 +++++++++
 stubs/meson.build           |  1 +
 5 files changed, 28 insertions(+)
 create mode 100644 stubs/blk-exp-find-by-blk.c

diff --git a/block.c b/block.c
index f6292f459a..601475e835 100644
--- a/block.c
+++ b/block.c
@@ -6326,7 +6326,11 @@ XDbgBlockGraph *bdrv_get_xdbg_block_graph(Error **errp)
     for (blk = blk_all_next(NULL); blk; blk = blk_all_next(blk)) {
         char *allocated_name = NULL;
         const char *name = blk_name(blk);
+        BlockExport *exp = blk_exp_find_by_blk(blk);
 
+        if (!*name && exp) {
+            name = exp->id;
+        }
         if (!*name) {
             name = allocated_name = blk_get_attached_dev_id(blk);
         }
diff --git a/block/export/export.c b/block/export/export.c
index 57beae7982..8744a1171e 100644
--- a/block/export/export.c
+++ b/block/export/export.c
@@ -60,6 +60,19 @@ BlockExport *blk_exp_find(const char *id)
     return NULL;
 }
 
+BlockExport *blk_exp_find_by_blk(BlockBackend *blk)
+{
+    BlockExport *exp;
+
+    QLIST_FOREACH(exp, &block_exports, next) {
+        if (exp->blk == blk) {
+            return exp;
+        }
+    }
+
+    return NULL;
+}
+
 static const BlockExportDriver *blk_exp_find_driver(BlockExportType type)
 {
     int i;
diff --git a/include/block/export.h b/include/block/export.h
index f2fe0f8078..16863d37cf 100644
--- a/include/block/export.h
+++ b/include/block/export.h
@@ -82,6 +82,7 @@ struct BlockExport {
 
 BlockExport *blk_exp_add(BlockExportOptions *export, Error **errp);
 BlockExport *blk_exp_find(const char *id);
+BlockExport *blk_exp_find_by_blk(BlockBackend *blk);
 void blk_exp_ref(BlockExport *exp);
 void blk_exp_unref(BlockExport *exp);
 void blk_exp_request_shutdown(BlockExport *exp);
diff --git a/stubs/blk-exp-find-by-blk.c b/stubs/blk-exp-find-by-blk.c
new file mode 100644
index 0000000000..2fc1da953b
--- /dev/null
+++ b/stubs/blk-exp-find-by-blk.c
@@ -0,0 +1,9 @@
+#include "qemu/osdep.h"
+#include "sysemu/block-backend.h"
+#include "block/export.h"
+
+BlockExport *blk_exp_find_by_blk(BlockBackend *blk)
+{
+    return NULL;
+}
+
diff --git a/stubs/meson.build b/stubs/meson.build
index 068998c1a5..cbe30f94e8 100644
--- a/stubs/meson.build
+++ b/stubs/meson.build
@@ -16,6 +16,7 @@ if have_block
   stub_ss.add(files('blk-commit-all.c'))
   stub_ss.add(files('blk-exp-close-all.c'))
   stub_ss.add(files('blk-by-qdev-id.c'))
+  stub_ss.add(files('blk-exp-find-by-blk.c'))
   stub_ss.add(files('blockdev-close-all-bdrv-states.c'))
   stub_ss.add(files('change-state-handler.c'))
   stub_ss.add(files('get-vm-name.c'))
-- 
2.34.1