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protect the scsi controller to be deleted when it is in use

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Steps to reproduce this bug:
1. virsh attach-disk domain --source imagefile --target sdb --sourcetype file --driver qemu --subdriver raw
2. virsh detach-device controller.xml # remove scsi controller 0
3. virsh detach-disk domain sdb
   error: Failed to detach disk
   error: operation failed: detaching scsi0-0-1 device failed: Device 'scsi0-0-1' not found

I think we should not detach a controller when it is used by some other device.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
This commit is contained in:
Wen Congyang 2011-02-21 15:35:52 +08:00 committed by Eric Blake
parent f409661e71
commit cf61114cee
1 changed files with 56 additions and 0 deletions
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56
src/qemu/qemu_hotplug.c
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@ -1297,6 +1297,56 @@ cleanup:
return ret; return ret;
} }
static bool qemuDomainDiskControllerIsBusy(virDomainObjPtr vm,
virDomainControllerDefPtr detach)
{
int i;
virDomainDiskDefPtr disk;
for (i = 0; i < vm->def->ndisks; i++) {
disk = vm->def->disks[i];
if (disk->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_DRIVE)
/* the disk does not use disk controller */
continue;
/* check whether the disk uses this type controller */
if (disk->bus == VIR_DOMAIN_DISK_BUS_IDE &&
detach->type != VIR_DOMAIN_CONTROLLER_TYPE_IDE)
continue;
if (disk->bus == VIR_DOMAIN_DISK_BUS_FDC &&
detach->type != VIR_DOMAIN_CONTROLLER_TYPE_FDC)
continue;
if (disk->bus == VIR_DOMAIN_DISK_BUS_SCSI &&
detach->type != VIR_DOMAIN_CONTROLLER_TYPE_SCSI)
continue;
if (disk->info.addr.drive.controller == detach->idx)
return true;
}
return false;
}
static bool qemuDomainControllerIsBusy(virDomainObjPtr vm,
virDomainControllerDefPtr detach)
{
switch (detach->type) {
case VIR_DOMAIN_CONTROLLER_TYPE_IDE:
case VIR_DOMAIN_CONTROLLER_TYPE_FDC:
case VIR_DOMAIN_CONTROLLER_TYPE_SCSI:
return qemuDomainDiskControllerIsBusy(vm, detach);
case VIR_DOMAIN_CONTROLLER_TYPE_SATA:
case VIR_DOMAIN_CONTROLLER_TYPE_VIRTIO_SERIAL:
case VIR_DOMAIN_CONTROLLER_TYPE_CCID:
default:
/* libvirt does not support sata controller, and does not support to
* detach virtio and smart card controller.
*/
return true;
}
}
int qemuDomainDetachPciControllerDevice(struct qemud_driver *driver, int qemuDomainDetachPciControllerDevice(struct qemud_driver *driver,
virDomainObjPtr vm, virDomainObjPtr vm,
virDomainDeviceDefPtr dev, virDomainDeviceDefPtr dev,
@ -1329,6 +1379,12 @@ int qemuDomainDetachPciControllerDevice(struct qemud_driver *driver,
goto cleanup; goto cleanup;
} }
if (qemuDomainControllerIsBusy(vm, detach)) {
qemuReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("device cannot be detached: device is busy"));
goto cleanup;
}
if (qemuCmdFlags & QEMUD_CMD_FLAG_DEVICE) { if (qemuCmdFlags & QEMUD_CMD_FLAG_DEVICE) {
if (qemuAssignDeviceControllerAlias(detach) < 0) if (qemuAssignDeviceControllerAlias(detach) < 0)
goto cleanup; goto cleanup;