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Re: [libvirt] [PATCH 4/5] libvirt/qemu - support modification of disks in inactive domain



On Mon, 14 Mar 2011 17:31:49 +0800
Wen Congyang <wency cn fujitsu com> wrote:

> At 03/03/2011 09:12 AM, KAMEZAWA Hiroyuki Write:
> >>From 8d2544bc773a2222c8aa1fdfc5cade20d8c1e958 Mon Sep 17 00:00:00 2001
> > From: KAMEZAWA Hiroyuki <kamezawa hiroyu jp fujitsu com>
> > Date: Thu, 3 Mar 2011 09:53:08 +0900
> > Subject: [PATCH 4/5] libvirt/qemu - support modification of disks in inactive domain
> > 
> > This patch adds support for persistent modification of disks in
> > inactive domain.
> > 
> > Signed-off-by: KAMEZAWA Hiroyuki <kamezawa hiroyu jp fujitsu com>
> > ---
> >  src/qemu/qemu_driver.c |   42 ++++++++++++++++++++++++++++++++++++++++++
> >  1 files changed, 42 insertions(+), 0 deletions(-)
> > 
> > diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
> > index 3248cdc..4df6bf9 100644
> > --- a/src/qemu/qemu_driver.c
> > +++ b/src/qemu/qemu_driver.c
> > @@ -4099,6 +4099,18 @@ 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 (STREQ(vdisk->dst, name))
> > +            return i;
> > +    }
> > +    return -1;
> > +}
> 
> This function can be moved into src/conf/domain_conf.c, and it may be used by other
> driver if this driver supports attach/detach device into inactive domain.
> 
ok, will move.


> >  /*
> >   * Attach a device given by XML, the change will be persistent
> >   * and domain XML definition file is updated.
> > @@ -4106,9 +4118,26 @@ cleanup:
> >  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;
> 
> Use virDomainDefAddImplicitControllers() to add any implied controllers
> which aren't present and used by attached disk.
> 
For ide or scsi ? ok.



> > +        newdev->data.disk = NULL;
> > +        break;
> >      default:
> >          qemuReportError(VIR_ERR_INVALID_ARG, "%s",
> >                          _("Sorry, the device is not suppored for now"));
> > @@ -4121,7 +4150,20 @@ static int qemuDomainAttachDevicePersistent(virDomainDefPtr vmdef,
> >  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"));
> 
> 

Thanks,
-Kame


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