qemu: Use proper backingIndex when reporting stats for backing chain

Use the index stored in virStorageSource struct rather than
recalculating it. Currently we'd report proper numbers but that will
change with blockdev.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 5936a9fa3cdb65290184dabc61173825eb8a1d1a..f5169479cffa6a90e2cf6326c088a63cb37b2121 100644 (file)
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -20031,7 +20031,6 @@ qemuDomainGetStatsOneBlock(virQEMUDriverPtr driver,
                            virDomainDiskDefPtr disk,
                            virStorageSourcePtr src,
                            size_t block_idx,
-                           unsigned int backing_idx,
                            virHashTablePtr stats,
                            virHashTablePtr nodedata)
 {
@@ -20040,16 +20039,16 @@ qemuDomainGetStatsOneBlock(virQEMUDriverPtr driver,
     char *alias = NULL;
 
     if (disk->info.alias)
-        alias = qemuDomainStorageAlias(disk->info.alias, backing_idx);
+        alias = qemuDomainStorageAlias(disk->info.alias, src->id);
 
     QEMU_ADD_NAME_PARAM(record, maxparams, "block", "name", block_idx,
                         disk->dst);
     if (virStorageSourceIsLocalStorage(src) && src->path)
         QEMU_ADD_NAME_PARAM(record, maxparams, "block", "path",
                             block_idx, src->path);
-    if (backing_idx)
+    if (src->id)
         QEMU_ADD_BLOCK_PARAM_UI(record, maxparams, block_idx, "backingIndex",
-                                backing_idx);
+                                src->id);
 
     /* the VM is offline so we have to go and load the stast from the disk by
      * ourselves */
@@ -20166,16 +20165,14 @@ qemuDomainGetStatsBlock(virQEMUDriverPtr driver,
     for (i = 0; i < dom->def->ndisks; i++) {
         virDomainDiskDefPtr disk = dom->def->disks[i];
         virStorageSourcePtr src = disk->src;
-        unsigned int backing_idx = 0;
 
         while (virStorageSourceIsBacking(src) &&
-               (backing_idx == 0 || visitBacking)) {
+               (src == disk->src || visitBacking)) {
             if (qemuDomainGetStatsOneBlock(driver, cfg, dom, record, maxparams,
-                                           disk, src, visited, backing_idx,
+                                           disk, src, visited,
                                            stats, nodestats) < 0)
                 goto cleanup;
             visited++;
-            backing_idx++;
             src = src->backingStore;
         }
     }