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qemu: hotplug: Prepare for blockdev-add/blockdev-del with backing chains

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Initialize data for the whole backing chain when plugging in or removing
disks when a machine supports -blockdev.

Similarly to startup we need to prepare the structures for the whole
backing chain and take care of the copy-on-read feature.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2018-07-13 14:48:59 +02:00
parent adf85f4791
commit 6d5468adc4
1 changed files with 62 additions and 15 deletions
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77
src/qemu/qemu_hotplug.c
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@ -380,6 +380,10 @@ qemuHotplugRemoveManagedPR(virQEMUDriverPtr driver,
struct _qemuHotplugDiskSourceData {
qemuBlockStorageSourceAttachDataPtr *backends;
size_t nbackends;
/* disk copy-on-read object */
virJSONValuePtr corProps;
char *corAlias;
};
typedef struct _qemuHotplugDiskSourceData qemuHotplugDiskSourceData;
typedef qemuHotplugDiskSourceData *qemuHotplugDiskSourceDataPtr;
@ -393,6 +397,9 @@ qemuHotplugDiskSourceDataFree(qemuHotplugDiskSourceDataPtr data)
if (!data)
return;
virJSONValueFree(data->corProps);
VIR_FREE(data->corAlias);
for (i = 0; i < data->nbackends; i++)
qemuBlockStorageSourceAttachDataFree(data->backends[i]);
@ -461,25 +468,40 @@ qemuHotplugRemoveStorageSourcePrepareData(virStorageSourcePtr src,
static qemuHotplugDiskSourceDataPtr
qemuHotplugDiskSourceRemovePrepare(virDomainDiskDefPtr disk,
virQEMUCapsPtr qemuCaps ATTRIBUTE_UNUSED)
virQEMUCapsPtr qemuCaps)
{
qemuDomainDiskPrivatePtr diskPriv = QEMU_DOMAIN_DISK_PRIVATE(disk);
qemuBlockStorageSourceAttachDataPtr backend = NULL;
qemuHotplugDiskSourceDataPtr data = NULL;
qemuHotplugDiskSourceDataPtr ret = NULL;
char *drivealias = NULL;
virStorageSourcePtr n;
if (VIR_ALLOC(data) < 0)
return NULL;
if (!(drivealias = qemuAliasDiskDriveFromDisk(disk)))
goto cleanup;
if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_BLOCKDEV)) {
if (VIR_STRDUP(data->corAlias, diskPriv->nodeCopyOnRead) < 0)
goto cleanup;
if (!(backend = qemuHotplugRemoveStorageSourcePrepareData(disk->src,
drivealias)))
goto cleanup;
for (n = disk->src; virStorageSourceIsBacking(n); n = n->backingStore) {
if (!(backend = qemuHotplugRemoveStorageSourcePrepareData(n, NULL)))
goto cleanup;
if (VIR_APPEND_ELEMENT(data->backends, data->nbackends, backend) < 0)
goto cleanup;
if (VIR_APPEND_ELEMENT(data->backends, data->nbackends, backend) < 0)
goto cleanup;
}
} else {
if (!(drivealias = qemuAliasDiskDriveFromDisk(disk)))
goto cleanup;
if (!(backend = qemuHotplugRemoveStorageSourcePrepareData(disk->src,
drivealias)))
goto cleanup;
if (VIR_APPEND_ELEMENT(data->backends, data->nbackends, backend) < 0)
goto cleanup;
}
VIR_STEAL_PTR(ret, data);
@ -502,21 +524,39 @@ static qemuHotplugDiskSourceDataPtr
qemuHotplugDiskSourceAttachPrepare(virDomainDiskDefPtr disk,
virQEMUCapsPtr qemuCaps)
{
qemuBlockStorageSourceAttachDataPtr backend;
qemuBlockStorageSourceAttachDataPtr backend = NULL;
qemuHotplugDiskSourceDataPtr data;
qemuHotplugDiskSourceDataPtr ret = NULL;
virStorageSourcePtr n;
if (VIR_ALLOC(data) < 0)
return NULL;
if (!(backend = qemuBuildStorageSourceAttachPrepareDrive(disk, qemuCaps)))
goto cleanup;
if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_BLOCKDEV)) {
if (disk->copy_on_read == VIR_TRISTATE_SWITCH_ON &&
!(data->corProps = qemuBlockStorageGetCopyOnReadProps(disk)))
goto cleanup;
if (qemuBuildStorageSourceAttachPrepareCommon(disk->src, backend, qemuCaps) < 0)
goto cleanup;
for (n = disk->src; virStorageSourceIsBacking(n); n = n->backingStore) {
if (!(backend = qemuBlockStorageSourceAttachPrepareBlockdev(n)))
goto cleanup;
if (VIR_APPEND_ELEMENT(data->backends, data->nbackends, backend) < 0)
goto cleanup;
if (qemuBuildStorageSourceAttachPrepareCommon(n, backend, qemuCaps) < 0)
goto cleanup;
if (VIR_APPEND_ELEMENT(data->backends, data->nbackends, backend) < 0)
goto cleanup;
}
} else {
if (!(backend = qemuBuildStorageSourceAttachPrepareDrive(disk, qemuCaps)))
goto cleanup;
if (qemuBuildStorageSourceAttachPrepareCommon(disk->src, backend, qemuCaps) < 0)
goto cleanup;
if (VIR_APPEND_ELEMENT(data->backends, data->nbackends, backend) < 0)
goto cleanup;
}
VIR_STEAL_PTR(ret, data);
@ -546,6 +586,10 @@ qemuHotplugDiskSourceAttach(qemuMonitorPtr mon,
return -1;
}
if (data->corProps &&
qemuMonitorAddObject(mon, &data->corProps, &data->corAlias) < 0)
return -1;
return 0;
}
@ -566,6 +610,9 @@ qemuHotplugDiskSourceRemove(qemuMonitorPtr mon,
{
size_t i;
if (data->corAlias)
ignore_value(qemuMonitorDelObject(mon, data->corAlias));
for (i = 0; i < data->nbackends; i++)
qemuBlockStorageSourceAttachRollback(mon, data->backends[i]);
}