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==
>From 030135224dd6563af0fb8615dc6a4b8e6084410d Mon Sep 17 00:00:00 2001
From: KAMEZAWA Hiroyuki <kamezawa@bluextal.(none)>
Date: Wed, 23 Feb 2011 15:25:26 +0900
Subject: [PATCH 1/2] libvirt/qemu : support attach/detach-disk --persistent
Now, only Xen supports 'virsh attach/detach-disk XXXX --persistent',
modifying inactive domain definition via virsh.
This patch adds a support for qemu. With this patch,
virsh attach/detach-disk --persistent works well with qemu.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
---
src/qemu/qemu_driver.c | 170 ++++++++++++++++++++++++++++++++++++++++++++++--
1 files changed, 163 insertions(+), 7 deletions(-)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 0f25a2a..703f86a 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -4082,16 +4082,174 @@ cleanup:
return ret;
}
+static int qemuDomainFindDiskByName(virDomainDefPtr vmdef, const char *name)
+{
+ virDomainDiskDefPtr vdisk;
+ int i;
+
+ for (i = 0; i < vmdef->ndisks; i++) {
+ vdisk = vmdef->disks[i];
+ if (!strcmp(vdisk->dst, name))
+ return i;
+ }
+ return -1;
+}
+/*
+ * Attach a device given by XML, the change will be persistent
+ * and domain XML definition file is updated.
+ */
+static int qemuDomainAttachDevicePersistent(virDomainDefPtr vmdef,
+ virDomainDeviceDefPtr newdev)
+{
+ virDomainDiskDefPtr disk;
+
+ /* At first, check device confliction */
+ switch(newdev->type) {
+ case VIR_DOMAIN_DEVICE_DISK:
+ disk = newdev->data.disk;
+ if (qemuDomainFindDiskByName(vmdef, disk->dst) >= 0) {
+ qemuReportError(VIR_ERR_INVALID_ARG,
+ _("target %s already exists."), disk->dst);
+ return -1;
+ }
+
+ if (virDomainDiskInsert(vmdef, disk)) {
+ virReportOOMError();
+ return -1;
+ }
+ if (disk->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI) {
+ /*
+ * Address/Drive information is NULL. If virtio, PCI address
+ * shoule be fixed. Other devices as IDE, SCSI...will get ID
+ * automatically
+ */
+ qemuDomainAssignPCIAddresses(vmdef);
+
+ }
+ newdev->data.disk = NULL;
+ break;
+ default:
+ qemuReportError(VIR_ERR_INVALID_ARG, "%s",
+ _("Sorry, the device is not suppored for now"));
+ return -1;
+ }
+
+ return 0;
+}
+
+static int qemuDomainDetachDevicePersistent(virDomainDefPtr vmdef,
+ virDomainDeviceDefPtr device)
+{
+ int x;
+ virDomainDiskDefPtr disk;
+
+ switch(device->type) {
+ case VIR_DOMAIN_DEVICE_DISK:
+ disk = device->data.disk;
+ x = qemuDomainFindDiskByName(vmdef, disk->dst);
+ if (x < 0) {
+ qemuReportError(VIR_ERR_INVALID_ARG,
+ _("target %s doesn't exist."), disk->dst);
+ return -1;
+ }
+ virDomainDiskRemove(vmdef, x);
+ break;
+ default:
+ qemuReportError(VIR_ERR_INVALID_ARG, "%s",
+ _("Sorry, the device is not suppored for now"));
+ return -1;
+ }
+ return 0;
+}
+
+static int qemuDomainModifyDevicePersistent(virDomainPtr dom,
+ const char *xml,
+ unsigned int attach)
+{
+ struct qemud_driver *driver;
+ virDomainDeviceDefPtr device;
+ virDomainDefPtr vmdef;
+ virDomainObjPtr vm;
+ int ret = -1;
+
+ if (!dom || !dom->conn || !dom->name || !xml) {
+ qemuReportError(VIR_ERR_INVALID_ARG,
+ _("internal error : %s"), __FUNCTION__);
+ return -1;
+ }
+
+ if (dom->conn->flags & VIR_CONNECT_RO)
+ return -1;
+
+ driver = dom->conn->privateData;
+ qemuDriverLock(driver);
+ vm = virDomainFindByUUID(&driver->domains, dom->uuid);
+ if (!vm) {
+ qemuReportError(VIR_ERR_NO_DOMAIN, _("cannot find domain '%s'"),
+ dom->name);
+ goto unlock_out;
+ }
+
+ if (qemuDomainObjBeginJobWithDriver(driver, vm) < 0) {
+ /*
+ * For now, just allow updating inactive domains. Further development
+ * will allow updating both active domain and its config file at
+ * the same time.
+ */
+ qemuReportError(VIR_ERR_INVALID_ARG,
+ _("cannot update alive domain : %s"), __FUNCTION__);
+ goto endjob;
+ }
+ vmdef = virDomainObjGetPersistentDef(driver->caps, vm);
+
+ if (!vmdef)
+ goto endjob;
+
+ device = virDomainDeviceDefParse(driver->caps,
+ vmdef, xml, VIR_DOMAIN_XML_INACTIVE);
+ if (!device)
+ goto endjob;
+
+ if (attach) {
+ ret = qemuDomainAttachDevicePersistent(vmdef, device);
+ if (ret < 0)
+ goto out;
+ } else {
+ ret = qemuDomainDetachDevicePersistent(vmdef, device);
+ if (ret < 0)
+ goto out;
+ }
+ ret = virDomainSaveConfig(driver->configDir, vmdef);
+
+out:
+ virDomainDeviceDefFree(device);
+endjob:
+ if (qemuDomainObjEndJob(vm) == 0)
+ vm = NULL;
+ if (vm)
+ virDomainObjUnlock(vm);
+ /* Note: insert of newdev is done by copy */
+unlock_out:
+ qemuDriverUnlock(driver);
+ return ret;
+}
+
static int qemudDomainAttachDeviceFlags(virDomainPtr dom,
const char *xml,
unsigned int flags) {
if (flags & VIR_DOMAIN_DEVICE_MODIFY_CONFIG) {
- qemuReportError(VIR_ERR_OPERATION_INVALID,
- "%s", _("cannot modify the persistent configuration of a domain"));
- return -1;
+ /*
+ * Because we can't update the live guest and XML
+ * in atomic, limiting modification as only-acrive and
+ * only-inactive. Need some idea to update both at the same time.
+ */
+ return qemuDomainModifyDevicePersistent(dom, xml, 1);
}
- return qemudDomainAttachDevice(dom, xml);
+ if (flags & VIR_DOMAIN_DEVICE_MODIFY_LIVE)
+ return qemudDomainAttachDevice(dom, xml);
+
+ return -1;
}
@@ -4304,9 +4462,7 @@ static int qemudDomainDetachDeviceFlags(virDomainPtr dom,
const char *xml,
unsigned int flags) {
if (flags & VIR_DOMAIN_DEVICE_MODIFY_CONFIG) {
- qemuReportError(VIR_ERR_OPERATION_INVALID,
- "%s", _("cannot modify the persistent configuration of a domain"));
- return -1;
+ return qemuDomainModifyDevicePersistent(dom, xml, 0);
}
return qemudDomainDetachDevice(dom, xml);
--
1.7.1
--
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