[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]

Re: [libvirt] [PATCH v3 2/3] libvirt/qemu - support updating inactive domains.



On Fri, Feb 25, 2011 at 01:40:44PM +0900, KAMEZAWA Hiroyuki wrote:
> >From fff185c7ae8892cb4d39f7adb90fe9e13cef5638 Mon Sep 17 00:00:00 2001
> From: KAMEZAWA Hiroyuki <kamezawa bluextal (none)>
> Date: Thu, 24 Feb 2011 19:02:42 +0900
> Subject: [PATCH 2/3] libvirt/qemu - support updating inactive domains.
> 
> Now, virsh attach-disk/detach-disk has --persistent option and
> it can update XML definition of inactive domains. But, it's only
> supported in Xen.
> 
> This patch adds support for attach-disk/detach-disk for qemu.
> 
> Note: This patch just allows to modify XML definition of 'inactive'
> domain. More patches will be required for modify 'active' domain
> in persistent mode. (modify XML + do hotplug)
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa hiroyu jp fujitsu com>
> 
> Changelog v2->v3:
>   - clean ups.
>   - handle all VIR_DOMAIN_DEVICE_MODIFY_XXX flags.
> ---
>  src/qemu/qemu_driver.c |  185 ++++++++++++++++++++++++++++++++++++++++++++---
>  1 files changed, 173 insertions(+), 12 deletions(-)
> 
> diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
> index 1a7bec9..a2987c4 100644
> --- a/src/qemu/qemu_driver.c
> +++ b/src/qemu/qemu_driver.c
> @@ -4097,16 +4097,173 @@ cleanup:
>      return ret;
>  }
>  
> -static int qemudDomainAttachDeviceFlags(virDomainPtr dom,
> +static int qemuDomainFindDiskByName(virDomainDefPtr vmdef, const char *name)
> +{
> +    virDomainDiskDefPtr vdisk;
> +    int i;
> +
> +    for (i = 0; i < vmdef->ndisks; i++) {
> +        vdisk = vmdef->disks[i];
> +        if (STREQ(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)) /* only failed with OOM */
> +            return -1;
> +
> +        if (disk->bus == VIR_DOMAIN_DISK_BUS_VIRTIO &&
> +            qemuDomainAssignPCIAddresses(vmdef) < 0)
> +                return -1;
> +        newdev->data.disk = NULL;
> +        break;
> +    default:
> +        qemuReportError(VIR_ERR_INVALID_ARG, "%s",
> +                        _("Sorry, the device is not suppored for now"));
> +        return -1;
> +    }
> +    

trailing spaces

> +    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 flags) {
> -    if (flags & VIR_DOMAIN_DEVICE_MODIFY_CONFIG) {
> -        qemuReportError(VIR_ERR_OPERATION_INVALID,
> -                        "%s", _("cannot modify the persistent configuration of a domain"));
> +                                        unsigned int attach, int flags)
> +{
> +    struct qemud_driver *driver;
> +    virDomainDeviceDefPtr device;
> +    virDomainDefPtr vmdef;
> +    virDomainObjPtr vm;
> +    int ret = -1;
> +
> +    if (!dom || !dom->conn || !dom->name || !xml) {
> +        qemuReportError(VIR_ERR_INTERNAL_ERROR,
> +                        _("internal error : %s"),  __FUNCTION__);
> +        return -1;
> +    }
> +    /*
> +     * When both of MODIFY_CONFIG and MODIFY_LIVE is specified at the same time,
> +     * return error for now. We should support this later.
> +     */
> +    if (flags & VIR_DOMAIN_DEVICE_MODIFY_LIVE) {
> +        qemuReportError(VIR_ERR_INVALID_ARG, "%s",
> +                        _("Now, cannot modify alive domain and its definition "
> +                          "at the same time."));
>          return -1;
>      }
>  
> -    return qemudDomainAttachDevice(dom, xml);
> +    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) 

trailing space

> +        goto unlock_out;
> +
> +    if (virDomainObjIsActive(vm)) {
> +        /*
> +         * 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_OPERATION_INVALID, "%s",
> +              _("Now, it's unsupported to update active domain's definition."));
> +        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);
> +    else
> +        ret = qemuDomainDetachDevicePersistent(vmdef, device);
> +
> +    if (!ret) /* save the result */
> +        ret = virDomainSaveConfig(driver->configDir, vmdef);
> +
> +    virDomainDeviceDefFree(device);
> +
> +endjob:
> +    if (qemuDomainObjEndJob(vm) == 0)
> +        vm = NULL;
> +    if (vm)
> +        virDomainObjUnlock(vm);
> +unlock_out:
> +    qemuDriverUnlock(driver);
> +    return ret;
> +}
> +
> +static int qemudDomainAttachDeviceFlags(virDomainPtr dom,
> +                                        const char *xml,
> +                                        unsigned int flags)
> +{
> +    if (flags & VIR_DOMAIN_DEVICE_MODIFY_CONFIG)
> +        return qemuDomainModifyDevicePersistent(dom, xml, 1, flags);
> +
> +    if (flags & VIR_DOMAIN_DEVICE_MODIFY_LIVE)
> +        return qemudDomainAttachDevice(dom, xml);
> +
> +    qemuReportError(VIR_ERR_INVALID_ARG, 

trailing space

> +        _("bad flag: %x only MODIFY_LIVE, MODIFY_CONFIG are supported now"),
> +       flags);
> +
> +    return -1;
>  }
>  
>  
> @@ -4320,13 +4477,17 @@ cleanup:
>  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 qemudDomainDetachDevice(dom, xml);
> +    if (flags & VIR_DOMAIN_DEVICE_MODIFY_CONFIG)
> +        return qemuDomainModifyDevicePersistent(dom, xml, 0, flags);
> +
> +    if (flags & VIR_DOMAIN_DEVICE_MODIFY_LIVE)
> +        return qemudDomainDetachDevice(dom, xml);
> +
> +    qemuReportError(VIR_ERR_INVALID_ARG,
> +        _("bad flag: %x only MODIFY_LIVE, MODIFY_CONFIG are supported now"),
> +       flags);
> +    return -1;
>  }
>  
>  static int qemudDomainGetAutostart(virDomainPtr dom,
> -- 
> 1.7.1

ACK with trailing spaces fixed and email address fixed.

-- 
Thanks,
Hu Tao


[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]