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/*
* qemu_blockjob.c: helper functions for QEMU block jobs
*
* Copyright (C) 2006-2015 Red Hat, Inc.
* Copyright (C) 2006 Daniel P. Berrange
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include "internal.h"
#include "qemu_blockjob.h"
#include "qemu_block.h"
#include "qemu_domain.h"
#include "conf/domain_conf.h"
#include "conf/domain_event.h"
#include "virlog.h"
#include "virstoragefile.h"
#include "virthread.h"
#include "virtime.h"
#include "locking/domain_lock.h"
#include "viralloc.h"
#define VIR_FROM_THIS VIR_FROM_QEMU
VIR_LOG_INIT("qemu.qemu_blockjob");
/**
* qemuBlockJobUpdate:
* @vm: domain
* @disk: domain disk
* @error: error (output parameter)
*
* Update disk's mirror state in response to a block job event stored in
* blockJobStatus by qemuProcessHandleBlockJob event handler.
*
* Returns the block job event processed or -1 if there was no pending event.
*/
int
qemuBlockJobUpdate(virDomainObjPtr vm,
qemuDomainAsyncJob asyncJob,
virDomainDiskDefPtr disk,
char **error)
{
qemuDomainDiskPrivatePtr diskPriv = QEMU_DOMAIN_DISK_PRIVATE(disk);
qemuDomainObjPrivatePtr priv = vm->privateData;
int status = diskPriv->blockJobStatus;
if (error)
*error = NULL;
if (status != -1) {
qemuBlockJobEventProcess(priv->driver, vm, disk, asyncJob,
diskPriv->blockJobType,
diskPriv->blockJobStatus);
diskPriv->blockJobStatus = -1;
if (error)
VIR_STEAL_PTR(*error, diskPriv->blockJobError);
else
VIR_FREE(diskPriv->blockJobError);
}
return status;
}
/**
* qemuBlockJobEventProcess:
* @driver: qemu driver
* @vm: domain
* @disk: domain disk
* @type: block job type
* @status: block job status
*
* Update disk's mirror state in response to a block job event
* from QEMU. For mirror state's that must survive libvirt
* restart, also update the domain's status XML.
*/
void
qemuBlockJobEventProcess(virQEMUDriverPtr driver,
virDomainObjPtr vm,
virDomainDiskDefPtr disk,
qemuDomainAsyncJob asyncJob,
int type,
int status)
{
virObjectEventPtr event = NULL;
virObjectEventPtr event2 = NULL;
const char *path;
virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
virDomainDiskDefPtr persistDisk = NULL;
qemuDomainDiskPrivatePtr diskPriv = QEMU_DOMAIN_DISK_PRIVATE(disk);
VIR_DEBUG("disk=%s, mirrorState=%s, type=%d, status=%d",
disk->dst,
NULLSTR(virDomainDiskMirrorStateTypeToString(disk->mirrorState)),
type,
status);
/* Have to generate two variants of the event for old vs. new
* client callbacks */
if (type == VIR_DOMAIN_BLOCK_JOB_TYPE_COMMIT &&
disk->mirrorJob == VIR_DOMAIN_BLOCK_JOB_TYPE_ACTIVE_COMMIT)
type = disk->mirrorJob;
path = virDomainDiskGetSource(disk);
event = virDomainEventBlockJobNewFromObj(vm, path, type, status);
event2 = virDomainEventBlockJob2NewFromObj(vm, disk->dst, type, status);
/* If we completed a block pull or commit, then update the XML
* to match. */
switch ((virConnectDomainEventBlockJobStatus) status) {
case VIR_DOMAIN_BLOCK_JOB_COMPLETED:
if (disk->mirrorState == VIR_DOMAIN_DISK_MIRROR_STATE_PIVOT) {
if (vm->newDef) {
virStorageSourcePtr copy = NULL;
if ((persistDisk = virDomainDiskByName(vm->newDef,
disk->dst, false))) {
copy = virStorageSourceCopy(disk->mirror, false);
if (!copy ||
virStorageSourceInitChainElement(copy,
persistDisk->src,
true) < 0) {
VIR_WARN("Unable to update persistent definition "
"on vm %s after block job",
vm->def->name);
virStorageSourceFree(copy);
copy = NULL;
persistDisk = NULL;
}
}
if (copy) {
virStorageSourceFree(persistDisk->src);
persistDisk->src = copy;
}
}
/* XXX We want to revoke security labels as well as audit that
* revocation, before dropping the original source. But it gets
* tricky if both source and mirror share common backing files (we
* want to only revoke the non-shared portion of the chain); so for
* now, we leak the access to the original. */
virDomainLockImageDetach(driver->lockManager, vm, disk->src);
virStorageSourceFree(disk->src);
disk->src = disk->mirror;
} else {
if (disk->mirror) {
virDomainLockImageDetach(driver->lockManager, vm, disk->mirror);
virStorageSourceFree(disk->mirror);
}
}
/* Recompute the cached backing chain to match our
* updates. Better would be storing the chain ourselves
* rather than reprobing, but we haven't quite completed
* that conversion to use our XML tracking. */
disk->mirror = NULL;
disk->mirrorState = VIR_DOMAIN_DISK_MIRROR_STATE_NONE;
disk->mirrorJob = VIR_DOMAIN_BLOCK_JOB_TYPE_UNKNOWN;
disk->src->id = 0;
ignore_value(qemuDomainDetermineDiskChain(driver, vm, disk,
true, true));
ignore_value(qemuBlockNodeNamesDetect(driver, vm, asyncJob));
diskPriv->blockjob = false;
break;
case VIR_DOMAIN_BLOCK_JOB_READY:
disk->mirrorState = VIR_DOMAIN_DISK_MIRROR_STATE_READY;
break;
case VIR_DOMAIN_BLOCK_JOB_FAILED:
case VIR_DOMAIN_BLOCK_JOB_CANCELED:
if (disk->mirror) {
virDomainLockImageDetach(driver->lockManager, vm, disk->mirror);
virStorageSourceFree(disk->mirror);
disk->mirror = NULL;
}
disk->mirrorState = VIR_DOMAIN_DISK_MIRROR_STATE_NONE;
disk->mirrorJob = VIR_DOMAIN_BLOCK_JOB_TYPE_UNKNOWN;
diskPriv->blockjob = false;
break;
case VIR_DOMAIN_BLOCK_JOB_LAST:
break;
}
if (virDomainSaveStatus(driver->xmlopt, cfg->stateDir, vm, driver->caps) < 0)
VIR_WARN("Unable to save status on vm %s after block job", vm->def->name);
if (status == VIR_DOMAIN_BLOCK_JOB_COMPLETED && vm->newDef) {
if (virDomainSaveConfig(cfg->configDir, driver->caps, vm->newDef) < 0)
VIR_WARN("Unable to update persistent definition on vm %s "
"after block job", vm->def->name);
}
qemuDomainEventQueue(driver, event);
qemuDomainEventQueue(driver, event2);
virObjectUnref(cfg);
}
/**
* qemuBlockJobSyncBegin:
* @disk: domain disk
*
* Begin a new synchronous block job for @disk. The synchronous
* block job is ended by a call to qemuBlockJobSyncEnd, or by
* the guest quitting.
*
* During a synchronous block job, a block job event for @disk
* will not be processed asynchronously. Instead, it will be
* processed only when qemuBlockJobUpdate or qemuBlockJobSyncEnd
* is called.
*/
void
qemuBlockJobSyncBegin(virDomainDiskDefPtr disk)
{
qemuDomainDiskPrivatePtr diskPriv = QEMU_DOMAIN_DISK_PRIVATE(disk);
VIR_DEBUG("disk=%s", disk->dst);
diskPriv->blockJobSync = true;
diskPriv->blockJobStatus = -1;
}
/**
* qemuBlockJobSyncEnd:
* @vm: domain
* @disk: domain disk
*
* End a synchronous block job for @disk. Any pending block job event
* for the disk is processed.
*/
void
qemuBlockJobSyncEnd(virDomainObjPtr vm,
qemuDomainAsyncJob asyncJob,
virDomainDiskDefPtr disk)
{
VIR_DEBUG("disk=%s", disk->dst);
qemuBlockJobUpdate(vm, asyncJob, disk, NULL);
QEMU_DOMAIN_DISK_PRIVATE(disk)->blockJobSync = false;
}
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