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Re: [libvirt] [PATCH 4/4] qemu: Move shared disk entry adding and unpriv_sgio seting



On Fri, Feb 08, 2013 at 09:08:02PM +0800, Osier Yang wrote:
> The disk def could be free'ed by qemuDomainChangeEjectableMedia
> for cdrom or floppy disk. This moves the adding and setting before
> the attaching takes place. And for cdrom floppy disk, if the
> change is ejecting, removing the existed hash entry for it.
> ---
>  src/qemu/qemu_driver.c  |   23 +++++++++++++----------
>  src/qemu/qemu_hotplug.c |    6 +++++-
>  src/qemu/qemu_hotplug.h |    3 ++-
>  3 files changed, 20 insertions(+), 12 deletions(-)
> 
> diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
> index 03fe526..4aad42f 100644
> --- a/src/qemu/qemu_driver.c
> +++ b/src/qemu/qemu_driver.c
> @@ -5789,6 +5789,7 @@ qemuDomainAttachDeviceDiskLive(virConnectPtr conn,
>  {
>      virDomainDiskDefPtr disk = dev->data.disk;
>      virCgroupPtr cgroup = NULL;
> +    int eject, added;
>      int ret = -1;
>  
>      if (disk->driverName != NULL && !STREQ(disk->driverName, "qemu")) {
> @@ -5798,6 +5799,12 @@ qemuDomainAttachDeviceDiskLive(virConnectPtr conn,
>          goto end;
>      }
>  
> +    if (qemuAddSharedDisk(driver->sharedDisks, disk, &added) < 0)
> +        goto end;
> +
> +    if (qemuSetUnprivSGIO(disk) < 0)
> +        goto end;
> +
>      if (qemuDomainDetermineDiskChain(driver, disk, false) < 0)
>          goto end;
>  
> @@ -5814,7 +5821,7 @@ qemuDomainAttachDeviceDiskLive(virConnectPtr conn,
>      switch (disk->device)  {
>      case VIR_DOMAIN_DISK_DEVICE_CDROM:
>      case VIR_DOMAIN_DISK_DEVICE_FLOPPY:
> -        ret = qemuDomainChangeEjectableMedia(driver, vm, disk, false);
> +        ret = qemuDomainChangeEjectableMedia(driver, vm, disk, false, &eject);
>          break;
>      case VIR_DOMAIN_DISK_DEVICE_DISK:
>      case VIR_DOMAIN_DISK_DEVICE_LUN:
> @@ -5843,22 +5850,18 @@ qemuDomainAttachDeviceDiskLive(virConnectPtr conn,
>          break;
>      }
>  
> +    if (ret == 0 && eject)
> +        ignore_value(qemuRemoveSharedDisk(driver->sharedDisks, disk));

This doesn't make sense - you're removing the disk we just added.
You need to remove the *old* disk->src surely ? In addition it is
*not* valid to reference 'disk' at all at this point, since the
functions we just called may have free'd it.

Daniel
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