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qemu: snapshot: Forbid snapshots when backing is a scsi passthrough disk

Browse Source 
https://bugzilla.redhat.com/show_bug.cgi?id=1034993

SCSI passthrough disks (<disk .. device="lun">) can't be used as backing
for snapshots. Currently with upstream qemu the vm crashes on such
attempt.

This patch adds a early check to catch an attempt to do such a snapshot
and rejects it right away. qemu will fix the issue but this will let us
control the error message.
This commit is contained in:
Peter Krempa 2014-01-21 15:34:39 +01:00
parent 00e9d6071b
commit 3d1e9e4779
1 changed files with 22 additions and 2 deletions
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24
src/qemu/qemu_driver.c
View File

@ -12206,7 +12206,7 @@ endjob:
}
static int
qemuDomainSnapshotPrepareDiskExternalBacking(virDomainDiskDefPtr disk)
qemuDomainSnapshotPrepareDiskExternalBackingInactive(virDomainDiskDefPtr disk)
{
int actualType = qemuDiskGetActualType(disk);
@ -12249,6 +12249,23 @@ qemuDomainSnapshotPrepareDiskExternalBacking(virDomainDiskDefPtr disk)
}
static int
qemuDomainSnapshotPrepareDiskExternalBackingActive(virDomainDiskDefPtr disk)
{
int actualType = qemuDiskGetActualType(disk);
if (actualType == VIR_DOMAIN_DISK_TYPE_BLOCK &&
disk->device == VIR_DOMAIN_DISK_DEVICE_LUN) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("external active snapshots are not supported on scsi "
"passthrough devices"));
return -1;
}
return 0;
}
static int
qemuDomainSnapshotPrepareDiskExternalOverlayActive(virDomainSnapshotDiskDefPtr disk)
{
@ -12315,12 +12332,15 @@ qemuDomainSnapshotPrepareDiskExternal(virConnectPtr conn,
if (qemuTranslateDiskSourcePool(conn, disk) < 0)
return -1;
if (qemuDomainSnapshotPrepareDiskExternalBacking(disk) < 0)
if (qemuDomainSnapshotPrepareDiskExternalBackingInactive(disk) < 0)
return -1;
if (qemuDomainSnapshotPrepareDiskExternalOverlayInactive(snapdisk) < 0)
return -1;
} else {
if (qemuDomainSnapshotPrepareDiskExternalBackingActive(disk) < 0)
return -1;
if (qemuDomainSnapshotPrepareDiskExternalOverlayActive(snapdisk) < 0)
return -1;
}