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qemu_snapshot: fix snapshot deletion that had multiple children

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When we revert to non-leaf snapshot and create new branch or branches
the overlay in snapshot metadata is no longer usable as a disk source
for deletion of that snapshot. We need to use other places to figure out
the correct storage source.

Fixes: https://gitlab.com/libvirt/libvirt/-/issues/534

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
This commit is contained in:
Pavel Hrdina 2023-11-01 10:12:22 +01:00
parent 1d456e18c7
commit 03a9a39c42
1 changed files with 44 additions and 2 deletions
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46
src/qemu/qemu_snapshot.c
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@ -2748,6 +2748,44 @@ qemuSnapshotGetDisksWithBackingStore(virDomainObj *vm,
}
/**
* qemuSnapshotExternalGetSnapDiskSrc:
* @vm: domain object
* @snap: snapshot object
* @snapDisk: disk definition from snapshost
*
* Try to get actual disk source for @snapDisk as the source stored in
* snapshot metadata is not always the correct source we need to work with.
* This happens mainly after reverting to non-leaf snapshot and creating
* new branch with new snapshot.
*
* Returns disk source on success, NULL on error.
*/
static virStorageSource *
qemuSnapshotExternalGetSnapDiskSrc(virDomainObj *vm,
virDomainMomentObj *snap,
virDomainSnapshotDiskDef *snapDisk)
{
virDomainDiskDef *disk = NULL;
/* Should never happen when deleting external snapshot as for now we do
* not support this specific case for now. */
if (snap->nchildren > 1)
return snapDisk->src;
if (snap->first_child) {
disk = qemuDomainDiskByName(snap->first_child->def->dom, snapDisk->name);
} else if (virDomainSnapshotGetCurrent(vm->snapshots) == snap) {
disk = qemuDomainDiskByName(vm->def, snapDisk->name);
}
if (disk)
return disk->src;
return snapDisk->src;
}
/**
* qemuSnapshotDeleteExternalPrepareData:
* @vm: domain object
@ -2802,18 +2840,22 @@ qemuSnapshotDeleteExternalPrepareData(virDomainObj *vm,
}
if (data->merge) {
virStorageSource *snapDiskSrc = NULL;
data->domDisk = qemuDomainDiskByName(vm->def, snapDisk->name);
if (!data->domDisk)
return -1;
snapDiskSrc = qemuSnapshotExternalGetSnapDiskSrc(vm, snap, data->snapDisk);
if (virDomainObjIsActive(vm)) {
data->diskSrc = virStorageSourceChainLookupBySource(data->domDisk->src,
data->snapDisk->src,
snapDiskSrc,
&data->prevDiskSrc);
if (!data->diskSrc)
return -1;
if (!virStorageSourceIsSameLocation(data->diskSrc, data->snapDisk->src)) {
if (!virStorageSourceIsSameLocation(data->diskSrc, snapDiskSrc)) {
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("VM disk source and snapshot disk source are not the same"));
return -1;