[libvirt] [PATCH] qemu: bulk stats: Ignore errors from missing/inaccessible disks

[Peter Krempa]

Rather than erroring out make the best attempt to retrieve other data if
disks are inaccessible or missing. The failure will still be logged
though.

Since the bulk stats API is called on multiple domains an error like
this makes the API unusable. This regression was introduced by commit
596a13713420e01b20ce3dc3fdbe06d073682675

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1209394
---
 src/qemu/qemu_driver.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index f5a3ef9..e79e2a9 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -19275,8 +19275,13 @@ qemuDomainGetStatsOneBlock(virQEMUDriverPtr driver,
             ret = 0;
             goto cleanup;
         }
-        if (qemuStorageLimitsRefresh(driver, cfg, dom, src) < 0)
+
+        if (qemuStorageLimitsRefresh(driver, cfg, dom, src) < 0) {
+            virResetLastError();
+            ret = 0;
             goto cleanup;
+        }
+
         if (src->allocation)
             QEMU_ADD_BLOCK_PARAM_ULL(record, maxparams, block_idx,
                                      "allocation", src->allocation);
-- 
2.3.5