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snapshot: implement getparent in qemu

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First hypervisor implementation of the new API.
Allows 'virsh snapshot-list --tree' to be more efficient.

* src/qemu/qemu_driver.c (qemuDomainSnapshotGetParent): New
function.
This commit is contained in:
Eric Blake 2011-09-24 18:02:24 -06:00
parent 1cf0e3db8b
commit 4ee8092dde
1 changed files with 46 additions and 0 deletions
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46
src/qemu/qemu_driver.c
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@ -9450,6 +9450,51 @@ cleanup:
return ret;
}
static virDomainSnapshotPtr
qemuDomainSnapshotGetParent(virDomainSnapshotPtr snapshot,
unsigned int flags)
{
struct qemud_driver *driver = snapshot->domain->conn->privateData;
virDomainObjPtr vm;
virDomainSnapshotObjPtr snap = NULL;
virDomainSnapshotPtr parent = NULL;
virCheckFlags(0, NULL);
qemuDriverLock(driver);
vm = virDomainFindByUUID(&driver->domains, snapshot->domain->uuid);
if (!vm) {
char uuidstr[VIR_UUID_STRING_BUFLEN];
virUUIDFormat(snapshot->domain->uuid, uuidstr);
qemuReportError(VIR_ERR_NO_DOMAIN,
_("no domain with matching uuid '%s'"), uuidstr);
goto cleanup;
}
snap = virDomainSnapshotFindByName(&vm->snapshots, snapshot->name);
if (!snap) {
qemuReportError(VIR_ERR_NO_DOMAIN_SNAPSHOT,
_("no domain snapshot with matching name '%s'"),
snapshot->name);
goto cleanup;
}
if (!snap->def->parent) {
qemuReportError(VIR_ERR_NO_DOMAIN_SNAPSHOT,
_("snapshot '%s' does not have a parent"),
snap->def->name);
goto cleanup;
}
parent = virGetDomainSnapshot(snapshot->domain, snap->def->parent);
cleanup:
if (vm)
virDomainObjUnlock(vm);
qemuDriverUnlock(driver);
return parent;
}
static virDomainSnapshotPtr qemuDomainSnapshotCurrent(virDomainPtr domain,
unsigned int flags)
{
@ -10431,6 +10476,7 @@ static virDriver qemuDriver = {
.domainSnapshotListNames = qemuDomainSnapshotListNames, /* 0.8.0 */
.domainSnapshotLookupByName = qemuDomainSnapshotLookupByName, /* 0.8.0 */
.domainHasCurrentSnapshot = qemuDomainHasCurrentSnapshot, /* 0.8.0 */
.domainSnapshotGetParent = qemuDomainSnapshotGetParent, /* 0.9.7 */
.domainSnapshotCurrent = qemuDomainSnapshotCurrent, /* 0.8.0 */
.domainRevertToSnapshot = qemuDomainRevertToSnapshot, /* 0.8.0 */
.domainSnapshotDelete = qemuDomainSnapshotDelete, /* 0.8.0 */