libxl: log failure from libxl__blktap_devpath in libxl_device_disk_add

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Ian Jackson <ian.jackson.citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 9984d46678ef50e5ecb78caefddd78c9f2f91827..e641ad932a42528d097a56216369e9681437c891 100644 (file)
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -1351,6 +1351,8 @@ int libxl_device_disk_add(libxl_ctx *ctx, uint32_t domid, libxl_device_disk *dis
         case LIBXL_DISK_BACKEND_TAP:
             dev = libxl__blktap_devpath(gc, disk->pdev_path, disk->format);
             if (!dev) {
+                LOG(ERROR, "failed to get blktap devpath for %p\n",
+                    disk->pdev_path);
                 rc = ERROR_FAIL;
                 goto out_free;
             }