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qemu: hotplug: Properly clean up drive backend if frontend hotplug fails

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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
(cherry picked from commit 64c6695f1a)
This commit is contained in:
Peter Krempa 2015-09-11 17:34:18 +02:00 committed by Cole Robinson
parent 9372343f7c
commit 66899258e1
1 changed files with 8 additions and 2 deletions
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10
src/qemu/qemu_hotplug.c
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@ -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);
@ -361,6 +362,9 @@ qemuDomainAttachVirtioDiskDevice(virConnectPtr conn,
if (!(drivestr = qemuBuildDriveStr(conn, disk, false, priv->qemuCaps)))
goto error;
if (!(drivealias = qemuDeviceDriveHostAlias(disk, priv->qemuCaps)))
goto error;
if (!(devstr = qemuBuildDriveDevStr(vm->def, disk, 0, priv->qemuCaps)))
goto error;
}
@ -375,10 +379,11 @@ 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);
NULLSTR(drivealias), drivestr);
}
if (orig_err) {
virSetError(orig_err);
@ -411,6 +416,7 @@ qemuDomainAttachVirtioDiskDevice(virConnectPtr conn,
cleanup:
VIR_FREE(devstr);
VIR_FREE(drivestr);
VIR_FREE(drivealias);
virObjectUnref(cfg);
return ret;