[libvirt] [PATCHv2] qemu: fix not update weight in def after success

[Luyao Huang]

https://bugzilla.redhat.com/show_bug.cgi?id=1253107

Call virCgroupGetBlkioWeight to re-read blkio.weight right
after it are set in order to keep our internal structures
up-to-date.

Signed-off-by: Luyao Huang <lhuang at redhat.com>
---
 src/qemu/qemu_driver.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index b6ac075..5cc38ad 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9183,7 +9183,8 @@ qemuDomainSetBlkioParameters(virDomainPtr dom,
             virTypedParameterPtr param = &params[i];
 
             if (STREQ(param->field, VIR_DOMAIN_BLKIO_WEIGHT)) {
-                if (virCgroupSetBlkioWeight(priv->cgroup, param->value.ui) < 0)
+                if (virCgroupSetBlkioWeight(priv->cgroup, param->value.ui) < 0 ||
+                    virCgroupGetBlkioWeight(priv->cgroup, &def->blkio.weight) < 0)
                     ret = -1;
             } else if (STREQ(param->field, VIR_DOMAIN_BLKIO_DEVICE_WEIGHT) ||
                        STREQ(param->field, VIR_DOMAIN_BLKIO_DEVICE_READ_IOPS) ||
-- 
1.8.3.1