Re: [PATCH] qemu: hotplug: Properly clean up drive backend if frontend hotplug fails

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On 11.09.2015 17:41, Peter Krempa wrote:
> Commit 8125113c added code that should remove the disk backend if the
> fronted hotplug failed for any reason. The code had a bug though as it
> used the disk string for unplug rather than the backend alias. Fix the
> code by pre-creating an alias string and using it instead of the disk
> string. In cases where qemu does not support QEMU_CAPS_DEVICE, we ignore
> the unplug of the backend since we can't really create an alias in that
> case.
> 
> Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1262399
> ---
>  src/qemu/qemu_hotplug.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
> index 63fafa6..c956e8c 100644
> --- a/src/qemu/qemu_hotplug.c
> +++ b/src/qemu/qemu_hotplug.c
> @@ -321,6 +321,7 @@ qemuDomainAttachVirtioDiskDevice(virConnectPtr conn,
>      qemuDomainObjPrivatePtr priv = vm->privateData;
>      char *devstr = NULL;
>      char *drivestr = NULL;
> +    char *drivealias = NULL;
>      bool releaseaddr = false;
>      virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
>      const char *src = virDomainDiskGetSource(disk);
> @@ -365,6 +366,10 @@ qemuDomainAttachVirtioDiskDevice(virConnectPtr conn,
>          if (!(drivestr = qemuBuildDriveStr(conn, disk, false, priv->qemuCaps)))
>              goto error;
> 
> +        if (virAsprintf(&drivealias, "%s%s", QEMU_DRIVE_HOST_PREFIX,
> +                        disk->info.alias) < 0)
> +            goto error;
> +

Maybe we can use qemuDeviceDriveHostAlias() instead of virAsprintf?

>          if (!(devstr = qemuBuildDriveDevStr(vm->def, disk, 0, priv->qemuCaps)))
>              goto error;
>      }
> @@ -379,7 +384,8 @@ qemuDomainAttachVirtioDiskDevice(virConnectPtr conn,
>              ret = qemuMonitorAddDevice(priv->mon, devstr);
>              if (ret < 0) {
>                  virErrorPtr orig_err = virSaveLastError();
> -                if (qemuMonitorDriveDel(priv->mon, drivestr) < 0) {
> +                if (!drivealias ||
> +                    qemuMonitorDriveDel(priv->mon, drivealias) < 0) {
>                      VIR_WARN("Unable to remove drive %s (%s) after failed "
>                               "qemuMonitorAddDevice",
>                               drivestr, devstr);
> @@ -415,6 +421,7 @@ qemuDomainAttachVirtioDiskDevice(virConnectPtr conn,
>   cleanup:
>      VIR_FREE(devstr);
>      VIR_FREE(drivestr);
> +    VIR_FREE(drivealias);
>      virObjectUnref(cfg);
>      return ret;
> 

ACK

Michal

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