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qemu_snapshot: introduce qemuSnapshotDomainDefUpdateDisk

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Extract the code that updates disks in domain definition while creating
external snapshots. We will use it later in the external snapshot revert
code.

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
This commit is contained in:
Pavel Hrdina 2023-02-20 10:48:40 +01:00
parent 8f9d96199d
commit 4edd9e297a
1 changed files with 38 additions and 25 deletions
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63
src/qemu/qemu_snapshot.c
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@ -142,6 +142,42 @@ qemuSnapshotFSThaw(virDomainObj *vm,
}
static int
qemuSnapshotDomainDefUpdateDisk(virDomainDef *domdef,
virDomainSnapshotDef *snapdef,
bool reuse)
{
size_t i;
for (i = 0; i < snapdef->ndisks; i++) {
g_autoptr(virStorageSource) newsrc = NULL;
virDomainSnapshotDiskDef *snapdisk = &(snapdef->disks[i]);
virDomainDiskDef *defdisk = domdef->disks[i];
if (snapdisk->snapshot != VIR_DOMAIN_SNAPSHOT_LOCATION_EXTERNAL)
continue;
if (!(newsrc = virStorageSourceCopy(snapdisk->src, false)))
return -1;
if (virStorageSourceInitChainElement(newsrc, defdisk->src, false) < 0)
return -1;
if (!reuse &&
virStorageSourceHasBacking(defdisk->src)) {
defdisk->src->readonly = true;
newsrc->backingStore = g_steal_pointer(&defdisk->src);
} else {
virObjectUnref(defdisk->src);
}
defdisk->src = g_steal_pointer(&newsrc);
}
return 0;
}
/* The domain is expected to be locked and inactive. */
static int
qemuSnapshotCreateInactiveInternal(virQEMUDriver *driver,
@ -216,31 +252,8 @@ qemuSnapshotCreateInactiveExternal(virQEMUDriver *driver,
}
/* update disk definitions */
for (i = 0; i < snapdef->ndisks; i++) {
g_autoptr(virStorageSource) newsrc = NULL;
snapdisk = &(snapdef->disks[i]);
defdisk = vm->def->disks[i];
if (snapdisk->snapshot != VIR_DOMAIN_SNAPSHOT_LOCATION_EXTERNAL)
continue;
if (!(newsrc = virStorageSourceCopy(snapdisk->src, false)))
goto cleanup;
if (virStorageSourceInitChainElement(newsrc, defdisk->src, false) < 0)
goto cleanup;
if (!reuse &&
virStorageSourceHasBacking(defdisk->src)) {
defdisk->src->readonly = true;
newsrc->backingStore = g_steal_pointer(&defdisk->src);
} else {
virObjectUnref(defdisk->src);
}
defdisk->src = g_steal_pointer(&newsrc);
}
if (qemuSnapshotDomainDefUpdateDisk(vm->def, snapdef, reuse) < 0)
goto cleanup;
if (virDomainDefSave(vm->def, driver->xmlopt, cfg->configDir) < 0)
goto cleanup;