[libvirt] [PATCH 10/13] qemu: snapshot: Don't overload 'ret' in qemuDomainSnapshotCreateDiskActive

[Peter Krempa]

Introduce 'rc' for collecting state from monitor commands so that we can
initialize 'ret' to -1. This also fixes few cases which could return 0
from the fucntion despite an error condition.

Signed-off-by: Peter Krempa <pkrempa at redhat.com>
---
 src/qemu/qemu_driver.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 220a5846d8..17270d5f83 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -15239,7 +15239,8 @@ qemuDomainSnapshotCreateDiskActive(virQEMUDriverPtr driver,
     qemuDomainObjPrivatePtr priv = vm->privateData;
     VIR_AUTOPTR(virJSONValue) actions = NULL;
     bool do_transaction = false;
-    int ret = 0;
+    int rc;
+    int ret = -1;
     size_t i;
     bool reuse = (flags & VIR_DOMAIN_SNAPSHOT_CREATE_REUSE_EXT) != 0;
     qemuDomainSnapshotDiskDataPtr diskdata = NULL;
@@ -15263,11 +15264,9 @@ qemuDomainSnapshotCreateDiskActive(virQEMUDriverPtr driver,
       * VIR_DOMAIN_SNAPSHOT_LOCATION_EXTERNAL with a valid file name and
       * qcow2 format.  */
     for (i = 0; i < ndiskdata; i++) {
-        ret = qemuDomainSnapshotCreateSingleDiskActive(driver, vm,
-                                                       &diskdata[i],
-                                                       actions, reuse);
-
-        if (ret < 0)
+        if (qemuDomainSnapshotCreateSingleDiskActive(driver, vm,
+                                                     &diskdata[i],
+                                                     actions, reuse) < 0)
             goto error;

         do_transaction = true;
@@ -15277,24 +15276,26 @@ qemuDomainSnapshotCreateDiskActive(virQEMUDriverPtr driver,
         if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
             goto cleanup;

-        ret = qemuMonitorTransaction(priv->mon, &actions);
+        rc = qemuMonitorTransaction(priv->mon, &actions);

         if (qemuDomainObjExitMonitor(driver, vm) < 0)
-            ret = -1;
+            rc = -1;

         for (i = 0; i < ndiskdata; i++) {
             qemuDomainSnapshotDiskDataPtr dd = &diskdata[i];

-            virDomainAuditDisk(vm, dd->disk->src, dd->src, "snapshot", ret >= 0);
+            virDomainAuditDisk(vm, dd->disk->src, dd->src, "snapshot", rc >= 0);

-            if (ret == 0)
+            if (rc == 0)
                 qemuDomainSnapshotUpdateDiskSources(dd);
         }

-        if (ret < 0)
+        if (rc < 0)
             goto error;
     }

+    ret = 0;
+
  error:
     if (ret < 0) {
         virErrorPreserveLast(&orig_err);
-- 
2.21.0