When virDomainBlockStatsFlags with NULL params fails, the returned read and write requests hash keys are said to be backwards compatible with the key names success case. However, they were rd_reqs and wr_reqs (in plural) as opposed to the success case's rd_req and wr_req. There is also a similar flush_reqs key, but that one does not have a corresponding value in the success case's hash, so it is left unmodified here. --- Virt.xs | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/Virt.xs b/Virt.xs index c47b915..a6f0477 100644 --- a/Virt.xs +++ b/Virt.xs @@ -5611,9 +5611,9 @@ block_stats(dom, path, flags=0) field = NULL; /* For back compat with previous hash above */ if (strcmp(params[i].field, "rd_operations") == 0) - field = "rd_reqs"; + field = "rd_req"; else if (strcmp(params[i].field, "wr_operations") == 0) - field = "wr_reqs"; + field = "wr_req"; else if (strcmp(params[i].field, "flush_operations") == 0) field = "flush_reqs"; if (field) { -- 2.14.1