[libvirt] [PATCHv2 02/26] snapshot: better event when reverting qemu to paused snapshot

[Eric Blake]

When reverting a running domain to a paused snapshot, the event
that fires should mention that the domain is suspended.

* include/libvirt/libvirt.h.in
(VIR_DOMAIN_EVENT_SUSPENDED_FROM_SNAPSHOT): New sub-event.
* src/qemu/qemu_driver.c (qemuDomainRevertToSnapshot): Use it.
---
 include/libvirt/libvirt.h.in |    3 ++-
 src/qemu/qemu_driver.c       |   10 ++++++----
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in
index aa29fb6..a625479 100644
--- a/include/libvirt/libvirt.h.in
+++ b/include/libvirt/libvirt.h.in
@@ -2010,7 +2010,7 @@ typedef enum {
     VIR_DOMAIN_EVENT_STARTED_BOOTED = 0,   /* Normal startup from boot */
     VIR_DOMAIN_EVENT_STARTED_MIGRATED = 1, /* Incoming migration from another host */
     VIR_DOMAIN_EVENT_STARTED_RESTORED = 2, /* Restored from a state file */
-    VIR_DOMAIN_EVENT_STARTED_FROM_SNAPSHOT = 3, /* Restored from snapshot */
+    VIR_DOMAIN_EVENT_STARTED_FROM_SNAPSHOT = 3, /* Restored from running snapshot */
 } virDomainEventStartedDetailType;

 /**
@@ -2023,6 +2023,7 @@ typedef enum {
     VIR_DOMAIN_EVENT_SUSPENDED_MIGRATED = 1, /* Suspended for offline migration */
     VIR_DOMAIN_EVENT_SUSPENDED_IOERROR = 2,  /* Suspended due to a disk I/O error */
     VIR_DOMAIN_EVENT_SUSPENDED_WATCHDOG = 3,  /* Suspended due to a watchdog firing */
+    VIR_DOMAIN_EVENT_SUSPENDED_FROM_SNAPSHOT = 4, /* Restored from paused snapshot */
 } virDomainEventSuspendedDetailType;

 /**
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 421a98e..78d99f4 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -8804,14 +8804,16 @@ static int qemuDomainRevertToSnapshot(virDomainSnapshotPtr snapshot,
                                      QEMU_ASYNC_JOB_NONE);
             if (rc < 0)
                 goto endjob;
+            event = virDomainEventNewFromObj(vm,
+                                             VIR_DOMAIN_EVENT_SUSPENDED,
+                                             VIR_DOMAIN_EVENT_SUSPENDED_FROM_SNAPSHOT);
         } else {
             virDomainObjSetState(vm, VIR_DOMAIN_RUNNING,
                                  VIR_DOMAIN_RUNNING_FROM_SNAPSHOT);
+            event = virDomainEventNewFromObj(vm,
+                                             VIR_DOMAIN_EVENT_STARTED,
+                                             VIR_DOMAIN_EVENT_STARTED_FROM_SNAPSHOT);
         }
-
-        event = virDomainEventNewFromObj(vm,
-                                         VIR_DOMAIN_EVENT_STARTED,
-                                         VIR_DOMAIN_EVENT_STARTED_FROM_SNAPSHOT);
     } else {
         /* qemu is a little funny with running guests and the restoration
          * of snapshots.  If the snapshot was taken online,
-- 
1.7.4.4