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qemuSnapshotCreateActiveExternal: Implement manual snapshot mode

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In case we are snapshotting at least one 'manual' disk we will pause the
VM and keep it paused.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1866400
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2022-03-04 14:37:13 +01:00
parent a1465e661e
commit 75aaf806c9
1 changed files with 17 additions and 8 deletions
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25
src/qemu/qemu_snapshot.c
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@ -458,6 +458,9 @@ qemuSnapshotPrepareDiskExternalActive(virDomainObj *vm,
{
int actualType = virStorageSourceGetActualType(snapdisk->src);
if (snapdisk->snapshot == VIR_DOMAIN_SNAPSHOT_LOCATION_MANUAL)
return 0;
if (domdisk->device == VIR_DOMAIN_DISK_DEVICE_LUN) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("external active snapshots are not supported on scsi "
@ -677,6 +680,7 @@ qemuSnapshotPrepareDiskInternal(virDomainDiskDef *disk,
static int
qemuSnapshotPrepare(virDomainObj *vm,
virDomainSnapshotDef *def,
bool *has_manual,
unsigned int *flags)
{
qemuDomainObjPrivate *priv = vm->privateData;
@ -758,9 +762,9 @@ qemuSnapshotPrepare(virDomainObj *vm,
break;
case VIR_DOMAIN_SNAPSHOT_LOCATION_MANUAL:
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("'manual' disk snapshot mode not yet implemented"));
return -1;
*has_manual = true;
forbid_internal = true;
break;
case VIR_DOMAIN_SNAPSHOT_LOCATION_NO:
/* Remember seeing a disk that has snapshot disabled */
@ -1341,6 +1345,7 @@ qemuSnapshotCreateActiveExternal(virQEMUDriver *driver,
virDomainObj *vm,
virDomainMomentObj *snap,
virQEMUDriverConfig *cfg,
bool has_manual,
unsigned int flags)
{
virObjectEvent *event;
@ -1391,11 +1396,14 @@ qemuSnapshotCreateActiveExternal(virQEMUDriver *driver,
} else if (virDomainObjGetState(vm, NULL) == VIR_DOMAIN_RUNNING) {
/* For full system external snapshots (those with memory), the guest
* must pause (either by libvirt up front, or by qemu after
* _LIVE converges). */
if (memory)
* _LIVE converges). We don't want to unpause it though if user has
* elected to manually snapshot some disks */
if (memory && !has_manual)
resume = true;
if (memory && !(flags & VIR_DOMAIN_SNAPSHOT_CREATE_LIVE)) {
/* we need to pause the VM even when we aren't taking a memory snapshot
* when the user wants to manually snapshot some disks */
if (((memory || has_manual) && !(flags & VIR_DOMAIN_SNAPSHOT_CREATE_LIVE))) {
if (qemuProcessStopCPUs(driver, vm, VIR_DOMAIN_PAUSED_SNAPSHOT,
QEMU_ASYNC_JOB_SNAPSHOT) < 0)
goto cleanup;
@ -1765,11 +1773,12 @@ qemuSnapshotCreate(virDomainObj *vm,
virDomainMomentObj *snap = NULL;
virDomainMomentObj *current = NULL;
virDomainSnapshotPtr ret = NULL;
bool has_manual = false; /* user wants to manually snapshot some disks */
if (qemuSnapshotCreateAlignDisks(vm, snapdef, driver, flags) < 0)
return NULL;
if (qemuSnapshotPrepare(vm, snapdef, &flags) < 0)
if (qemuSnapshotPrepare(vm, snapdef, &has_manual, &flags) < 0)
return NULL;
if (flags & VIR_DOMAIN_SNAPSHOT_CREATE_NO_METADATA) {
@ -1790,7 +1799,7 @@ qemuSnapshotCreate(virDomainObj *vm,
if (flags & VIR_DOMAIN_SNAPSHOT_CREATE_DISK_ONLY ||
virDomainSnapshotObjGetDef(snap)->memory == VIR_DOMAIN_SNAPSHOT_LOCATION_EXTERNAL) {
/* external full system or disk snapshot */
if (qemuSnapshotCreateActiveExternal(driver, vm, snap, cfg, flags) < 0)
if (qemuSnapshotCreateActiveExternal(driver, vm, snap, cfg, has_manual, flags) < 0)
goto error;
} else {
/* internal full system */