[PATCH] check driver name while attaching disk

[Wen Congyang <wency@xxxxxxxxxxxxxx>]

This bug was reported by Shi Jin(jinzishuai@xxxxxxxxx):
=============
# virsh attach-disk RHEL6RC /var/lib/libvirt/images/test3.img vdb  --driver file --subdriver qcow2
Disk attached successfully

# virsh save RHEL6RC /var/lib/libvirt/images/memory.save 
Domain RHEL6RC saved to /var/lib/libvirt/images/memory.save

# virsh restore /var/lib/libvirt/images/memory.save 
error: Failed to restore domain from /var/lib/libvirt/images/memory.save
error: internal error unsupported driver name 'file' for disk '/var/lib/libvirt/images/test3.img'
=============

We have checked the driver name when we start or restore VM, but we do not check it while attaching
a disk.

Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>

---
 src/qemu/qemu_driver.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 2892dfe..e94080d 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -3994,6 +3994,14 @@ static int qemudDomainAttachDevice(virDomainPtr dom,
         goto endjob;
 
     if (dev->type == VIR_DOMAIN_DEVICE_DISK) {
+        if (dev->data.disk->driverName != NULL &&
+            !STREQ(dev->data.disk->driverName, "qemu")) {
+            qemuReportError(VIR_ERR_INTERNAL_ERROR,
+                            _("unsupported driver name '%s' for disk '%s'"),
+                            dev->data.disk->driverName, dev->data.disk->src);
+            goto endjob;
+        }
+
         if (qemuCgroupControllerActive(driver, VIR_CGROUP_CONTROLLER_DEVICES)) {
             if (virCgroupForDomain(driver->cgroup, vm->def->name, &cgroup, 0) !=0 ) {
                 qemuReportError(VIR_ERR_INTERNAL_ERROR,
-- 
1.7.1

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