[libvirt] [PATCH] Fix regressions BlockStats/Info APIs in QEMU driver

[Daniel P. Berrange]

From: "Daniel P. Berrange" <berrange at redhat.com>

The change 18c2a592064d69499f70428e498f4a3cb5161cda caused
some regressions in behaviour of virDomainBlockStats
and virDomainBlockInfo in the QEMU driver.

The virDomainBlockInfo API stopped working for inactive
guests if querying a block device.

The virDomainBlockStats API did not promptly report
an error if the guest was not running in some cases.

* src/qemu/qemu_driver.c: Fix inactive guest handling
  in BlockStats/Info APIs
---
 src/qemu/qemu_driver.c |   17 +++++++++++------
 1 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 5632d62..3716b15 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -5531,6 +5531,12 @@ qemudDomainBlockStats (virDomainPtr dom,
         goto cleanup;
     }
 
+    if (!virDomainObjIsActive(vm)) {
+        qemuReportError(VIR_ERR_OPERATION_INVALID,
+                        "%s", _("domain is not running"));
+        goto cleanup;
+    }
+
     for (i = 0 ; i < vm->def->ndisks ; i++) {
         if (STREQ(path, vm->def->disks[i]->dst)) {
             disk = vm->def->disks[i];
@@ -5994,7 +6000,8 @@ static int qemuDomainGetBlockInfo(virDomainPtr dom,
        highest allocated extent from QEMU */
     if (disk->type == VIR_DOMAIN_DISK_TYPE_BLOCK &&
         format != VIR_STORAGE_FILE_RAW &&
-        S_ISBLK(sb.st_mode)) {
+        S_ISBLK(sb.st_mode) &&
+        virDomainObjIsActive(vm)) {
         qemuDomainObjPrivatePtr priv = vm->privateData;
 
         if ((priv->jobActive == QEMU_JOB_MIGRATION_OUT)
@@ -6017,10 +6024,9 @@ static int qemuDomainGetBlockInfo(virDomainPtr dom,
             if (qemuDomainObjBeginJob(vm) < 0)
                 goto cleanup;
 
-            if (!virDomainObjIsActive(vm)) {
-                qemuReportError(VIR_ERR_OPERATION_INVALID,
-                                "%s", _("domain is not running"));
-                goto endjob;
+            if (virDomainObjIsActive(vm)) {
+                ret = 0;
+                goto cleanup;
             }
 
             qemuDomainObjEnterMonitor(vm);
@@ -6029,7 +6035,6 @@ static int qemuDomainGetBlockInfo(virDomainPtr dom,
                                             &info->allocation);
             qemuDomainObjExitMonitor(vm);
 
-endjob:
             if (qemuDomainObjEndJob(vm) == 0)
                 vm = NULL;
         }
-- 
1.7.5.2