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qemu_hotplug: try harder to eject media
Some guests lock the tray and QEMU eject command will simply fail to eject the media. But the guest OS can handle this attempt to eject the media and can unlock the tray and open it. In this case, we should try again to actually eject the media. If the first attempt fails to detect a tray_open we will fail with error, from monitor. If we receive that event, we know, that the guest properly reacted to the eject request, unlocked the tray and opened it. In this case, we need to run the command again to actually eject the media from the device. The reason to call it again is, that QEMU doesn't wait for the guest to react and report an error, that the tray is locked. Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1147471 Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
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256496e149
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@ -59,7 +59,7 @@
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VIR_LOG_INIT("qemu.qemu_hotplug");
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#define CHANGE_MEDIA_RETRIES 10
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#define CHANGE_MEDIA_TIMEOUT 5000
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/* Wait up to 5 seconds for device removal to finish. */
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unsigned long long qemuDomainRemoveDeviceWaitTime = 1000ull * 5;
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@ -166,12 +166,13 @@ qemuDomainChangeEjectableMedia(virQEMUDriverPtr driver,
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virStorageSourcePtr newsrc,
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bool force)
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{
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int ret = -1;
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int ret = -1, rc;
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char *driveAlias = NULL;
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qemuDomainObjPrivatePtr priv = vm->privateData;
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int retries = CHANGE_MEDIA_RETRIES;
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const char *format = NULL;
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char *sourcestr = NULL;
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bool ejectRetry = false;
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unsigned long long now;
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if (!disk->info.alias) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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@ -193,36 +194,31 @@ qemuDomainChangeEjectableMedia(virQEMUDriverPtr driver,
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if (!(driveAlias = qemuDeviceDriveHostAlias(disk, priv->qemuCaps)))
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goto error;
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qemuDomainObjEnterMonitor(driver, vm);
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ret = qemuMonitorEjectMedia(priv->mon, driveAlias, force);
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if (qemuDomainObjExitMonitor(driver, vm) < 0) {
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ret = -1;
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goto cleanup;
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}
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do {
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qemuDomainObjEnterMonitor(driver, vm);
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rc = qemuMonitorEjectMedia(priv->mon, driveAlias, force);
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if (qemuDomainObjExitMonitor(driver, vm) < 0)
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goto cleanup;
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if (ret < 0)
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goto error;
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if (rc == -2) {
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/* we've already tried, error out */
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if (ejectRetry)
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goto error;
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VIR_DEBUG("tray is locked, wait for the guest to unlock "
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"the tray and try to eject it again");
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ejectRetry = true;
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} else if (rc < 0) {
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goto error;
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}
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virObjectRef(vm);
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/* we don't want to report errors from media tray_open polling */
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while (retries) {
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if (disk->tray_status == VIR_DOMAIN_DISK_TRAY_OPEN)
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break;
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if (virTimeMillisNow(&now) < 0)
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goto error;
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retries--;
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virObjectUnlock(vm);
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VIR_DEBUG("Waiting 500ms for tray to open. Retries left %d", retries);
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usleep(500 * 1000); /* sleep 500ms */
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virObjectLock(vm);
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}
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virObjectUnref(vm);
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if (retries <= 0) {
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virReportError(VIR_ERR_OPERATION_FAILED, "%s",
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_("Unable to eject media"));
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ret = -1;
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goto error;
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}
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while (disk->tray_status != VIR_DOMAIN_DISK_TRAY_OPEN) {
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if (virDomainObjWaitUntil(vm, now + CHANGE_MEDIA_TIMEOUT) != 0)
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goto error;
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}
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} while (ejectRetry && rc != 0);
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if (!virStorageSourceIsEmpty(newsrc)) {
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if (qemuGetDriveSourceString(newsrc, conn, &sourcestr) < 0)
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@ -237,19 +233,17 @@ qemuDomainChangeEjectableMedia(virQEMUDriverPtr driver,
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}
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}
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qemuDomainObjEnterMonitor(driver, vm);
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ret = qemuMonitorChangeMedia(priv->mon,
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driveAlias,
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sourcestr,
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format);
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if (qemuDomainObjExitMonitor(driver, vm) < 0) {
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ret = -1;
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rc = qemuMonitorChangeMedia(priv->mon,
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driveAlias,
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sourcestr,
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format);
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if (qemuDomainObjExitMonitor(driver, vm) < 0)
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goto cleanup;
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}
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}
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virDomainAuditDisk(vm, disk->src, newsrc, "update", ret >= 0);
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virDomainAuditDisk(vm, disk->src, newsrc, "update", rc >= 0);
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if (ret < 0)
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if (rc < 0)
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goto error;
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/* remove the old source from shared device list */
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@ -259,6 +253,7 @@ qemuDomainChangeEjectableMedia(virQEMUDriverPtr driver,
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virStorageSourceFree(disk->src);
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disk->src = newsrc;
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newsrc = NULL;
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ret = 0;
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cleanup:
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VIR_FREE(driveAlias);
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@ -1152,6 +1152,8 @@ qemuProcessHandleTrayChange(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
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VIR_WARN("Unable to save status on vm %s after tray moved event",
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vm->def->name);
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}
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virDomainObjBroadcast(vm);
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}
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virObjectUnlock(vm);
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