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libvirt/src/qemu/qemu_blockjob.c
Peter Krempa 3f93884a4d qemu: Add -blockdev support for block commit job 
Introduce the handler for finalizing a block commit and active bloc
commit job which will allow to use it with blockdev.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
2019-07-29 13:58:26 +02:00

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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 "qemu_alias.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"
#include "virstring.h"
#include "qemu_security.h"
#define VIR_FROM_THIS VIR_FROM_QEMU
VIR_LOG_INIT("qemu.qemu_blockjob");
/* Note that qemuBlockjobState and qemuBlockjobType values are formatted into
* the status XML */
VIR_ENUM_IMPL(qemuBlockjobState,
QEMU_BLOCKJOB_STATE_LAST,
"completed",
"failed",
"cancelled",
"ready",
"new",
"running",
"concluded",
"aborting",
"pivoting");
VIR_ENUM_IMPL(qemuBlockjob,
QEMU_BLOCKJOB_TYPE_LAST,
"",
"pull",
"copy",
"commit",
"active-commit",
"");
static virClassPtr qemuBlockJobDataClass;
static void
qemuBlockJobDataDispose(void *obj)
{
qemuBlockJobDataPtr job = obj;
virObjectUnref(job->chain);
virObjectUnref(job->mirrorChain);
VIR_FREE(job->name);
VIR_FREE(job->errmsg);
}
static int
qemuBlockJobDataOnceInit(void)
{
if (!VIR_CLASS_NEW(qemuBlockJobData, virClassForObject()))
return -1;
return 0;
}
VIR_ONCE_GLOBAL_INIT(qemuBlockJobData);
qemuBlockJobDataPtr
qemuBlockJobDataNew(qemuBlockJobType type,
const char *name)
{
VIR_AUTOUNREF(qemuBlockJobDataPtr) job = NULL;
if (qemuBlockJobDataInitialize() < 0)
return NULL;
if (!(job = virObjectNew(qemuBlockJobDataClass)))
return NULL;
if (VIR_STRDUP(job->name, name) < 0)
return NULL;
job->state = QEMU_BLOCKJOB_STATE_NEW;
job->newstate = -1;
job->type = type;
VIR_RETURN_PTR(job);
}
/**
* qemuBlockJobRegister:
* @job: job to register
* @vm: domain to register @job with
* @disk: disk to register @job with
* @savestatus: save the status XML after registering
*
* This function registers @job with @disk and @vm and records it into the status
* xml (if @savestatus is true).
*
* Note that if @job also references a separate chain e.g. for disk mirroring,
* then qemuBlockJobDiskRegisterMirror should be used separately.
*/
int
qemuBlockJobRegister(qemuBlockJobDataPtr job,
virDomainObjPtr vm,
virDomainDiskDefPtr disk,
bool savestatus)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
if (virHashAddEntry(priv->blockjobs, job->name, virObjectRef(job)) < 0) {
virObjectUnref(job);
return -1;
}
if (disk) {
job->disk = disk;
job->chain = virObjectRef(disk->src);
QEMU_DOMAIN_DISK_PRIVATE(disk)->blockjob = virObjectRef(job);
}
if (savestatus)
qemuDomainSaveStatus(vm);
return 0;
}
static void
qemuBlockJobUnregister(qemuBlockJobDataPtr job,
virDomainObjPtr vm)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
qemuDomainDiskPrivatePtr diskPriv;
if (job->disk) {
diskPriv = QEMU_DOMAIN_DISK_PRIVATE(job->disk);
if (job == diskPriv->blockjob) {
virObjectUnref(diskPriv->blockjob);
diskPriv->blockjob = NULL;
}
job->disk = NULL;
}
/* this may remove the last reference of 'job' */
virHashRemoveEntry(priv->blockjobs, job->name);
qemuDomainSaveStatus(vm);
}
/**
* qemuBlockJobDiskNew:
* @disk: disk definition
*
* Start/associate a new blockjob with @disk.
*
* Returns 0 on success and -1 on failure.
*/
qemuBlockJobDataPtr
qemuBlockJobDiskNew(virDomainObjPtr vm,
virDomainDiskDefPtr disk,
qemuBlockJobType type,
const char *jobname)
{
VIR_AUTOUNREF(qemuBlockJobDataPtr) job = NULL;
if (!(job = qemuBlockJobDataNew(type, jobname)))
return NULL;
if (qemuBlockJobRegister(job, vm, disk, true) < 0)
return NULL;
VIR_RETURN_PTR(job);
}
qemuBlockJobDataPtr
qemuBlockJobDiskNewPull(virDomainObjPtr vm,
virDomainDiskDefPtr disk,
virStorageSourcePtr base)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
VIR_AUTOUNREF(qemuBlockJobDataPtr) job = NULL;
VIR_AUTOFREE(char *) jobname = NULL;
if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV)) {
if (virAsprintf(&jobname, "pull-%s-%s", disk->dst, disk->src->nodeformat) < 0)
return NULL;
} else {
if (!(jobname = qemuAliasDiskDriveFromDisk(disk)))
return NULL;
}
if (!(job = qemuBlockJobDataNew(QEMU_BLOCKJOB_TYPE_PULL, jobname)))
return NULL;
job->data.pull.base = base;
if (qemuBlockJobRegister(job, vm, disk, true) < 0)
return NULL;
VIR_RETURN_PTR(job);
}
qemuBlockJobDataPtr
qemuBlockJobDiskNewCommit(virDomainObjPtr vm,
virDomainDiskDefPtr disk,
virStorageSourcePtr topparent,
virStorageSourcePtr top,
virStorageSourcePtr base)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
VIR_AUTOUNREF(qemuBlockJobDataPtr) job = NULL;
VIR_AUTOFREE(char *) jobname = NULL;
qemuBlockJobType jobtype = QEMU_BLOCKJOB_TYPE_COMMIT;
if (topparent == NULL)
jobtype = QEMU_BLOCKJOB_TYPE_ACTIVE_COMMIT;
if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV)) {
if (virAsprintf(&jobname, "commit-%s-%s", disk->dst, top->nodeformat) < 0)
return NULL;
} else {
if (!(jobname = qemuAliasDiskDriveFromDisk(disk)))
return NULL;
}
if (!(job = qemuBlockJobDataNew(jobtype, jobname)))
return NULL;
job->data.commit.topparent = topparent;
job->data.commit.top = top;
job->data.commit.base = base;
if (qemuBlockJobRegister(job, vm, disk, true) < 0)
return NULL;
VIR_RETURN_PTR(job);
}
/**
* qemuBlockJobDiskRegisterMirror:
* @job: block job to register 'mirror' chain on
*
* In cases when the disk->mirror attribute references a separate storage chain
* such as for block-copy, this function registers it with the job. Note
* that this function does not save the status XML and thus must be used before
* qemuBlockJobRegister or qemuBlockJobStarted to properly track the chain
* in the status XML.
*/
void
qemuBlockJobDiskRegisterMirror(qemuBlockJobDataPtr job)
{
if (job->disk)
job->mirrorChain = virObjectRef(job->disk->mirror);
}
/**
* qemuBlockJobDiskGetJob:
* @disk: disk definition
*
* Get a reference to the block job data object associated with @disk.
*/
qemuBlockJobDataPtr
qemuBlockJobDiskGetJob(virDomainDiskDefPtr disk)
{
qemuBlockJobDataPtr job = QEMU_DOMAIN_DISK_PRIVATE(disk)->blockjob;
if (!job)
return NULL;
return virObjectRef(job);
}
/**
* qemuBlockJobStarted:
* @job: job data
*
* Mark @job as started in qemu.
*/
void
qemuBlockJobStarted(qemuBlockJobDataPtr job,
virDomainObjPtr vm)
{
if (job->state == QEMU_BLOCKJOB_STATE_NEW)
job->state = QEMU_BLOCKJOB_STATE_RUNNING;
qemuDomainSaveStatus(vm);
}
/**
* qemuBlockJobStartupFinalize:
* @job: job being started
*
* Cancels and clears the job private data if the job was not started with
* qemu (see qemuBlockJobStarted) or just clears up the local reference
* to @job if it was started.
*/
void
qemuBlockJobStartupFinalize(virDomainObjPtr vm,
qemuBlockJobDataPtr job)
{
if (!job)
return;
if (job->state == QEMU_BLOCKJOB_STATE_NEW)
qemuBlockJobUnregister(job, vm);
virObjectUnref(job);
}
bool
qemuBlockJobIsRunning(qemuBlockJobDataPtr job)
{
return job->state == QEMU_BLOCKJOB_STATE_RUNNING ||
job->state == QEMU_BLOCKJOB_STATE_READY ||
job->state == QEMU_BLOCKJOB_STATE_ABORTING ||
job->state == QEMU_BLOCKJOB_STATE_PIVOTING;
}
/* returns 1 for a job we didn't reconnect to */
static int
qemuBlockJobRefreshJobsFindInactive(const void *payload,
const void *name ATTRIBUTE_UNUSED,
const void *data ATTRIBUTE_UNUSED)
{
const qemuBlockJobData *job = payload;
return !job->reconnected;
}
int
qemuBlockJobRefreshJobs(virQEMUDriverPtr driver,
virDomainObjPtr vm)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
qemuMonitorJobInfoPtr *jobinfo = NULL;
size_t njobinfo = 0;
qemuBlockJobDataPtr job = NULL;
int newstate;
size_t i;
int ret = -1;
int rc;
qemuDomainObjEnterMonitor(driver, vm);
rc = qemuMonitorGetJobInfo(priv->mon, &jobinfo, &njobinfo);
if (qemuDomainObjExitMonitor(driver, vm) < 0 || rc < 0)
goto cleanup;
for (i = 0; i < njobinfo; i++) {
if (!(job = virHashLookup(priv->blockjobs, jobinfo[i]->id))) {
VIR_DEBUG("ignoring untracked job '%s'", jobinfo[i]->id);
continue;
}
/* try cancelling invalid jobs - this works only if the job is not
* concluded. In such case it will fail. We'll leave such job linger
* in qemu and just forget about it in libvirt because there's not much
* we coud do besides killing the VM */
if (job->invalidData) {
qemuDomainObjEnterMonitor(driver, vm);
rc = qemuMonitorJobCancel(priv->mon, job->name, true);
if (rc == -1 && jobinfo[i]->status == QEMU_MONITOR_JOB_STATUS_CONCLUDED)
VIR_WARN("can't cancel job '%s' with invalid data", job->name);
if (qemuDomainObjExitMonitor(driver, vm) < 0)
goto cleanup;
if (rc < 0)
qemuBlockJobUnregister(job, vm);
continue;
}
if ((newstate = qemuBlockjobConvertMonitorStatus(jobinfo[i]->status)) < 0)
continue;
if (newstate != job->state) {
if ((job->state == QEMU_BLOCKJOB_STATE_FAILED ||
job->state == QEMU_BLOCKJOB_STATE_COMPLETED)) {
/* preserve the old state but allow the job to be bumped to
* execute the finishing steps */
job->newstate = job->state;
} else if (newstate == QEMU_BLOCKJOB_STATE_CONCLUDED) {
if (VIR_STRDUP(job->errmsg, jobinfo[i]->error) < 0)
goto cleanup;
if (job->errmsg)
job->newstate = QEMU_BLOCKJOB_STATE_FAILED;
else
job->newstate = QEMU_BLOCKJOB_STATE_COMPLETED;
} else if (newstate == QEMU_BLOCKJOB_STATE_READY) {
/* Apply _READY state only if it was not applied before */
if (job->state == QEMU_BLOCKJOB_STATE_NEW ||
job->state == QEMU_BLOCKJOB_STATE_RUNNING)
job->newstate = newstate;
}
/* don't update the job otherwise */
}
job->reconnected = true;
if (job->newstate != -1)
qemuBlockJobUpdate(vm, job, QEMU_ASYNC_JOB_NONE);
}
/* remove data for job which qemu didn't report (the algorithm is
* inefficient, but the possibility of such jobs is very low */
while ((job = virHashSearch(priv->blockjobs, qemuBlockJobRefreshJobsFindInactive, NULL, NULL)))
qemuBlockJobUnregister(job, vm);
ret = 0;
cleanup:
for (i = 0; i < njobinfo; i++)
qemuMonitorJobInfoFree(jobinfo[i]);
VIR_FREE(jobinfo);
return ret;
}
/**
* qemuBlockJobEmitEvents:
*
* Emits the VIR_DOMAIN_EVENT_ID_BLOCK_JOB and VIR_DOMAIN_EVENT_ID_BLOCK_JOB_2
* for a block job. The former event is emitted only for local disks.
*/
static void
qemuBlockJobEmitEvents(virQEMUDriverPtr driver,
virDomainObjPtr vm,
virDomainDiskDefPtr disk,
virDomainBlockJobType type,
virConnectDomainEventBlockJobStatus status)
{
virObjectEventPtr event = NULL;
virObjectEventPtr event2 = NULL;
/* don't emit events for jobs without disk */
if (!disk)
return;
/* don't emit events for internal jobs and states */
if (type >= VIR_DOMAIN_BLOCK_JOB_TYPE_LAST ||
status >= VIR_DOMAIN_BLOCK_JOB_LAST)
return;
if (virStorageSourceIsLocalStorage(disk->src) &&
!virStorageSourceIsEmpty(disk->src)) {
event = virDomainEventBlockJobNewFromObj(vm, virDomainDiskGetSource(disk),
type, status);
virObjectEventStateQueue(driver->domainEventState, event);
}
event2 = virDomainEventBlockJob2NewFromObj(vm, disk->dst, type, status);
virObjectEventStateQueue(driver->domainEventState, event2);
}
/**
* qemuBlockJobCleanStorageSourceRuntime:
* @src: storage source to clean from runtime data
*
* Remove all runtime related data from the storage source.
*/
static void
qemuBlockJobCleanStorageSourceRuntime(virStorageSourcePtr src)
{
src->id = 0;
src->detected = false;
VIR_FREE(src->relPath);
VIR_FREE(src->backingStoreRaw);
VIR_FREE(src->nodestorage);
VIR_FREE(src->nodeformat);
VIR_FREE(src->tlsAlias);
VIR_FREE(src->tlsCertdir);
}
/**
* qemuBlockJobRewriteConfigDiskSource:
* @vm: domain object
* @disk: live definition disk
* @newsrc: new source which should be also considered for the new disk
*
* For block jobs which modify the running disk source it is required that we
* try our best to update the config XML's disk source as well in most cases.
*
* This helper finds the disk from the persistent definition corresponding to
* @disk and updates its source to @newsrc.
*/
static void
qemuBlockJobRewriteConfigDiskSource(virDomainObjPtr vm,
virDomainDiskDefPtr disk,
virStorageSourcePtr newsrc)
{
virDomainDiskDefPtr persistDisk = NULL;
VIR_AUTOUNREF(virStorageSourcePtr) copy = NULL;
if (!vm->newDef)
return;
if (!(persistDisk = virDomainDiskByName(vm->newDef, disk->dst, false)))
return;
if (!virStorageSourceIsSameLocation(disk->src, persistDisk->src))
return;
if (!(copy = virStorageSourceCopy(newsrc, false)) ||
virStorageSourceInitChainElement(copy, persistDisk->src, true) < 0) {
VIR_WARN("Unable to update persistent definition on vm %s after block job",
vm->def->name);
return;
}
qemuBlockJobCleanStorageSourceRuntime(copy);
virObjectUnref(persistDisk->src);
VIR_STEAL_PTR(persistDisk->src, copy);
}
static void
qemuBlockJobEventProcessLegacyCompleted(virQEMUDriverPtr driver,
virDomainObjPtr vm,
qemuBlockJobDataPtr job,
int asyncJob)
{
virDomainDiskDefPtr disk = job->disk;
if (!disk)
return;
if (disk->mirrorState == VIR_DOMAIN_DISK_MIRROR_STATE_PIVOT) {
qemuBlockJobRewriteConfigDiskSource(vm, disk, disk->mirror);
/* 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);
/* Move secret driver metadata */
if (qemuSecurityMoveImageMetadata(driver, vm, disk->src, disk->mirror) < 0)
VIR_WARN("Unable to move disk metadata on vm %s", vm->def->name);
virObjectUnref(disk->src);
disk->src = disk->mirror;
} else {
if (disk->mirror) {
virDomainLockImageDetach(driver->lockManager, vm, disk->mirror);
virObjectUnref(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;
virStorageSourceBackingStoreClear(disk->src);
ignore_value(qemuDomainDetermineDiskChain(driver, vm, disk, NULL, true));
ignore_value(qemuBlockNodeNamesDetect(driver, vm, asyncJob));
qemuBlockJobUnregister(job, vm);
qemuDomainSaveConfig(vm);
}
/**
* qemuBlockJobEventProcessLegacy:
* @driver: qemu driver
* @vm: domain
* @job: job to process events for
*
* 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.
*/
static void
qemuBlockJobEventProcessLegacy(virQEMUDriverPtr driver,
virDomainObjPtr vm,
qemuBlockJobDataPtr job,
int asyncJob)
{
virDomainDiskDefPtr disk = job->disk;
VIR_DEBUG("disk=%s, mirrorState=%s, type=%d, state=%d, newstate=%d",
disk->dst,
NULLSTR(virDomainDiskMirrorStateTypeToString(disk->mirrorState)),
job->type,
job->state,
job->newstate);
if (job->newstate == -1)
return;
qemuBlockJobEmitEvents(driver, vm, disk, job->type, job->newstate);
job->state = job->newstate;
job->newstate = -1;
/* If we completed a block pull or commit, then update the XML
* to match. */
switch ((virConnectDomainEventBlockJobStatus) job->state) {
case VIR_DOMAIN_BLOCK_JOB_COMPLETED:
qemuBlockJobEventProcessLegacyCompleted(driver, vm, job, asyncJob);
break;
case VIR_DOMAIN_BLOCK_JOB_READY:
disk->mirrorState = VIR_DOMAIN_DISK_MIRROR_STATE_READY;
qemuDomainSaveStatus(vm);
break;
case VIR_DOMAIN_BLOCK_JOB_FAILED:
case VIR_DOMAIN_BLOCK_JOB_CANCELED:
if (disk->mirror) {
virDomainLockImageDetach(driver->lockManager, vm, disk->mirror);
virObjectUnref(disk->mirror);
disk->mirror = NULL;
}
disk->mirrorState = VIR_DOMAIN_DISK_MIRROR_STATE_NONE;
disk->mirrorJob = VIR_DOMAIN_BLOCK_JOB_TYPE_UNKNOWN;
qemuBlockJobUnregister(job, vm);
break;
case VIR_DOMAIN_BLOCK_JOB_LAST:
break;
}
}
static void
qemuBlockJobEventProcessConcludedRemoveChain(virQEMUDriverPtr driver,
virDomainObjPtr vm,
qemuDomainAsyncJob asyncJob,
virStorageSourcePtr chain)
{
VIR_AUTOPTR(qemuBlockStorageSourceChainData) data = NULL;
if (!(data = qemuBlockStorageSourceChainDetachPrepareBlockdev(chain)))
return;
if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
return;
qemuBlockStorageSourceChainDetach(qemuDomainGetMonitor(vm), data);
if (qemuDomainObjExitMonitor(driver, vm) < 0)
return;
qemuDomainStorageSourceChainAccessRevoke(driver, vm, chain);
}
/**
* qemuBlockJobGetConfigDisk:
* @vm: domain object
* @disk: disk from the running definition
* @diskChainBottom: the last element of backing chain of @disk which is relevant
*
* Finds and returns the disk corresponding to @disk in the inactive definition.
* The inactive disk must have the backing chain starting from the source until
* @@diskChainBottom identical. If @diskChainBottom is NULL the whole backing
* chains of both @disk and the persistent config definition equivalent must
* be identical.
*/
static virDomainDiskDefPtr
qemuBlockJobGetConfigDisk(virDomainObjPtr vm,
virDomainDiskDefPtr disk,
virStorageSourcePtr diskChainBottom)
{
virStorageSourcePtr disksrc = NULL;
virStorageSourcePtr cfgsrc = NULL;
virDomainDiskDefPtr ret = NULL;
if (!vm->newDef || !disk)
return NULL;
disksrc = disk->src;
if (!(ret = virDomainDiskByName(vm->newDef, disk->dst, false)))
return NULL;
cfgsrc = ret->src;
while (disksrc && cfgsrc) {
if (!virStorageSourceIsSameLocation(disksrc, cfgsrc))
return NULL;
if (diskChainBottom && diskChainBottom == disksrc)
return ret;
disksrc = disksrc->backingStore;
cfgsrc = cfgsrc->backingStore;
}
if (disksrc || cfgsrc)
return NULL;
return ret;
}
/**
* qemuBlockJobClearConfigChain:
* @vm: domain object
* @disk: disk object from running definition of @vm
*
* In cases when the backing chain definitions of the live disk differ from
* the definition for the next start config and the backing chain would touch
* it we'd not be able to restore the chain in the next start config properly.
*
* This function checks that the source of the running disk definition and the
* config disk definition are the same and if such it clears the backing chain
* data.
*/
static void
qemuBlockJobClearConfigChain(virDomainObjPtr vm,
virDomainDiskDefPtr disk)
{
virDomainDiskDefPtr cfgdisk = NULL;
if (!vm->newDef || !disk)
return;
if (!(cfgdisk = virDomainDiskByName(vm->newDef, disk->dst, false)))
return;
if (!virStorageSourceIsSameLocation(disk->src, cfgdisk->src))
return;
virObjectUnref(cfgdisk->src->backingStore);
cfgdisk->src->backingStore = NULL;
}
/**
* qemuBlockJobProcessEventCompletedPull:
* @driver: qemu driver object
* @vm: domain object
* @job: job data
* @asyncJob: qemu asynchronous job type (for monitor interaction)
*
* This function executes the finalizing steps after a successful block pull job
* (block-stream in qemu terminology. The pull job copies all the data from the
* images in the backing chain up to the 'base' image. The 'base' image becomes
* the backing store of the active top level image. If 'base' was not used
* everything is pulled into the top level image and the top level image will
* cease to have backing store. All intermediate images between the active image
* and base image are no longer required and can be unplugged.
*/
static void
qemuBlockJobProcessEventCompletedPull(virQEMUDriverPtr driver,
virDomainObjPtr vm,
qemuBlockJobDataPtr job,
qemuDomainAsyncJob asyncJob)
{
virStorageSourcePtr baseparent = NULL;
virDomainDiskDefPtr cfgdisk = NULL;
virStorageSourcePtr cfgbase = NULL;
virStorageSourcePtr cfgbaseparent = NULL;
virStorageSourcePtr n;
virStorageSourcePtr tmp;
VIR_DEBUG("pull job '%s' on VM '%s' completed", job->name, vm->def->name);
/* if the job isn't associated with a disk there's nothing to do */
if (!job->disk)
return;
if ((cfgdisk = qemuBlockJobGetConfigDisk(vm, job->disk, job->data.pull.base)))
cfgbase = cfgdisk->src->backingStore;
if (!cfgdisk)
qemuBlockJobClearConfigChain(vm, job->disk);
/* when pulling if 'base' is right below the top image we don't have to modify it */
if (job->disk->src->backingStore == job->data.pull.base)
return;
if (job->data.pull.base) {
for (n = job->disk->src->backingStore; n && n != job->data.pull.base; n = n->backingStore) {
/* find the image on top of 'base' */
if (cfgbase) {
cfgbaseparent = cfgbase;
cfgbase = cfgbase->backingStore;
}
baseparent = n;
}
}
tmp = job->disk->src->backingStore;
job->disk->src->backingStore = job->data.pull.base;
if (baseparent)
baseparent->backingStore = NULL;
qemuBlockJobEventProcessConcludedRemoveChain(driver, vm, asyncJob, tmp);
virObjectUnref(tmp);
if (cfgdisk) {
tmp = cfgdisk->src->backingStore;
cfgdisk->src->backingStore = cfgbase;
if (cfgbaseparent)
cfgbaseparent->backingStore = NULL;
virObjectUnref(tmp);
}
}
/**
* qemuBlockJobProcessEventCompletedCommit:
* @driver: qemu driver object
* @vm: domain object
* @job: job data
* @asyncJob: qemu asynchronous job type (for monitor interaction)
*
* This function executes the finalizing steps after a successful block commit
* job. The commit job moves the blocks from backing chain images starting from
* 'top' into the 'base' image. The overlay of the 'top' image ('topparent')
* then directly references the 'base' image. All intermediate images can be
* removed/deleted.
*/
static void
qemuBlockJobProcessEventCompletedCommit(virQEMUDriverPtr driver,
virDomainObjPtr vm,
qemuBlockJobDataPtr job,
qemuDomainAsyncJob asyncJob)
{
virStorageSourcePtr baseparent = NULL;
virDomainDiskDefPtr cfgdisk = NULL;
virStorageSourcePtr cfgnext = NULL;
virStorageSourcePtr cfgtopparent = NULL;
virStorageSourcePtr cfgtop = NULL;
virStorageSourcePtr cfgbase = NULL;
virStorageSourcePtr cfgbaseparent = NULL;
virStorageSourcePtr n;
VIR_DEBUG("commit job '%s' on VM '%s' completed", job->name, vm->def->name);
/* if the job isn't associated with a disk there's nothing to do */
if (!job->disk)
return;
if ((cfgdisk = qemuBlockJobGetConfigDisk(vm, job->disk, job->data.commit.base)))
cfgnext = cfgdisk->src;
if (!cfgdisk)
qemuBlockJobClearConfigChain(vm, job->disk);
for (n = job->disk->src; n && n != job->data.commit.base; n = n->backingStore) {
if (cfgnext) {
if (n == job->data.commit.topparent)
cfgtopparent = cfgnext;
if (n == job->data.commit.top)
cfgtop = cfgnext;
cfgbaseparent = cfgnext;
cfgnext = cfgnext->backingStore;
}
baseparent = n;
}
if (!n)
return;
/* revert access to images */
qemuDomainStorageSourceAccessAllow(driver, vm, job->data.commit.base, true, false);
if (job->data.commit.topparent != job->disk->src)
qemuDomainStorageSourceAccessAllow(driver, vm, job->data.commit.topparent, true, false);
baseparent->backingStore = NULL;
job->data.commit.topparent->backingStore = job->data.commit.base;
qemuBlockJobEventProcessConcludedRemoveChain(driver, vm, asyncJob, job->data.commit.top);
virObjectUnref(job->data.commit.top);
job->data.commit.top = NULL;
if (cfgbaseparent) {
cfgbase = cfgbaseparent->backingStore;
cfgbaseparent->backingStore = NULL;
if (cfgtopparent)
cfgtopparent->backingStore = cfgbase;
else
cfgdisk->src = cfgbase;
virObjectUnref(cfgtop);
}
}
/**
* qemuBlockJobProcessEventCompletedActiveCommit:
* @driver: qemu driver object
* @vm: domain object
* @job: job data
* @asyncJob: qemu asynchronous job type (for monitor interaction)
*
* This function executes the finalizing steps after a successful active layer
* block commit job. The commit job moves the blocks from backing chain images
* starting from the active disk source image into the 'base' image. The disk
* source then changes to the 'base' image. All intermediate images can be
* removed/deleted.
*/
static void
qemuBlockJobProcessEventCompletedActiveCommit(virQEMUDriverPtr driver,
virDomainObjPtr vm,
qemuBlockJobDataPtr job,
qemuDomainAsyncJob asyncJob)
{
virStorageSourcePtr baseparent = NULL;
virDomainDiskDefPtr cfgdisk = NULL;
virStorageSourcePtr cfgnext = NULL;
virStorageSourcePtr cfgtop = NULL;
virStorageSourcePtr cfgbase = NULL;
virStorageSourcePtr cfgbaseparent = NULL;
virStorageSourcePtr n;
VIR_DEBUG("active commit job '%s' on VM '%s' completed", job->name, vm->def->name);
/* if the job isn't associated with a disk there's nothing to do */
if (!job->disk)
return;
if ((cfgdisk = qemuBlockJobGetConfigDisk(vm, job->disk, job->data.commit.base)))
cfgnext = cfgdisk->src;
for (n = job->disk->src; n && n != job->data.commit.base; n = n->backingStore) {
if (cfgnext) {
if (n == job->data.commit.top)
cfgtop = cfgnext;
cfgbaseparent = cfgnext;
cfgnext = cfgnext->backingStore;
}
baseparent = n;
}
if (!n)
return;
if (!cfgdisk) {
/* in case when the config disk chain didn't match but the disk top seems
* to be identical we need to modify the disk source since the active
* commit makes the top level image invalid.
*/
qemuBlockJobRewriteConfigDiskSource(vm, job->disk, job->data.commit.base);
} else {
cfgbase = cfgbaseparent->backingStore;
cfgbaseparent->backingStore = NULL;
cfgdisk->src = cfgbase;
virObjectUnref(cfgtop);
}
/* Move security driver metadata */
if (qemuSecurityMoveImageMetadata(driver, vm, job->disk->src, job->data.commit.base) < 0)
VIR_WARN("Unable to move disk metadata on vm %s", vm->def->name);
baseparent->backingStore = NULL;
job->disk->src = job->data.commit.base;
qemuBlockJobEventProcessConcludedRemoveChain(driver, vm, asyncJob, job->data.commit.top);
virObjectUnref(job->data.commit.top);
job->data.commit.top = NULL;
/* the mirror element does not serve functional purpose for the commit job */
virObjectUnref(job->disk->mirror);
job->disk->mirror = NULL;
}
static void
qemuBlockJobEventProcessConcludedTransition(qemuBlockJobDataPtr job,
virQEMUDriverPtr driver,
virDomainObjPtr vm,
qemuDomainAsyncJob asyncJob)
{
switch ((qemuBlockjobState) job->newstate) {
case QEMU_BLOCKJOB_STATE_COMPLETED:
switch ((qemuBlockJobType) job->type) {
case QEMU_BLOCKJOB_TYPE_PULL:
qemuBlockJobProcessEventCompletedPull(driver, vm, job, asyncJob);
break;
case QEMU_BLOCKJOB_TYPE_COMMIT:
qemuBlockJobProcessEventCompletedCommit(driver, vm, job, asyncJob);
break;
case QEMU_BLOCKJOB_TYPE_ACTIVE_COMMIT:
qemuBlockJobProcessEventCompletedActiveCommit(driver, vm, job, asyncJob);
break;
case QEMU_BLOCKJOB_TYPE_COPY:
case QEMU_BLOCKJOB_TYPE_NONE:
case QEMU_BLOCKJOB_TYPE_INTERNAL:
case QEMU_BLOCKJOB_TYPE_LAST:
default:
break;
}
break;
case QEMU_BLOCKJOB_STATE_FAILED:
case QEMU_BLOCKJOB_STATE_CANCELLED:
switch ((qemuBlockJobType) job->type) {
case QEMU_BLOCKJOB_TYPE_PULL:
case QEMU_BLOCKJOB_TYPE_COMMIT:
break;
case QEMU_BLOCKJOB_TYPE_ACTIVE_COMMIT:
if (job->disk) {
virObjectUnref(job->disk->mirror);
job->disk->mirror = NULL;
}
break;
case QEMU_BLOCKJOB_TYPE_COPY:
case QEMU_BLOCKJOB_TYPE_NONE:
case QEMU_BLOCKJOB_TYPE_INTERNAL:
case QEMU_BLOCKJOB_TYPE_LAST:
default:
break;
}
break;
/* states below are impossible in this handler */
case QEMU_BLOCKJOB_STATE_READY:
case QEMU_BLOCKJOB_STATE_NEW:
case QEMU_BLOCKJOB_STATE_RUNNING:
case QEMU_BLOCKJOB_STATE_CONCLUDED:
case QEMU_BLOCKJOB_STATE_ABORTING:
case QEMU_BLOCKJOB_STATE_PIVOTING:
case QEMU_BLOCKJOB_STATE_LAST:
default:
break;
}
qemuBlockJobEmitEvents(driver, vm, job->disk, job->type, job->newstate);
job->state = job->newstate;
job->newstate = -1;
}
static void
qemuBlockJobEventProcessConcluded(qemuBlockJobDataPtr job,
virQEMUDriverPtr driver,
virDomainObjPtr vm,
qemuDomainAsyncJob asyncJob)
{
qemuMonitorJobInfoPtr *jobinfo = NULL;
size_t njobinfo = 0;
size_t i;
int rc = 0;
bool dismissed = false;
bool refreshed = false;
if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
goto cleanup;
/* we need to fetch the error state as the event does not propagate it */
if (job->newstate == QEMU_BLOCKJOB_STATE_CONCLUDED &&
(rc = qemuMonitorGetJobInfo(qemuDomainGetMonitor(vm), &jobinfo, &njobinfo)) == 0) {
for (i = 0; i < njobinfo; i++) {
if (STRNEQ_NULLABLE(job->name, jobinfo[i]->id))
continue;
if (VIR_STRDUP(job->errmsg, jobinfo[i]->error) < 0)
rc = -1;
if (job->errmsg)
job->newstate = QEMU_BLOCKJOB_STATE_FAILED;
else
job->newstate = QEMU_BLOCKJOB_STATE_COMPLETED;
refreshed = true;
break;
}
if (i == njobinfo) {
VIR_WARN("failed to refresh job '%s'", job->name);
rc = -1;
}
}
/* dismiss job in qemu */
if (rc >= 0) {
if ((rc = qemuMonitorJobDismiss(qemuDomainGetMonitor(vm), job->name)) >= 0)
dismissed = true;
}
if (job->invalidData) {
VIR_WARN("terminating job '%s' with invalid data", job->name);
goto cleanup;
}
if (qemuDomainObjExitMonitor(driver, vm) < 0 || rc < 0)
goto cleanup;
if (job->newstate == QEMU_BLOCKJOB_STATE_COMPLETED &&
job->state == QEMU_BLOCKJOB_STATE_ABORTING)
job->newstate = QEMU_BLOCKJOB_STATE_CANCELLED;
if (refreshed)
qemuDomainSaveStatus(vm);
VIR_DEBUG("handling job '%s' state '%d' newstate '%d'", job->name, job->state, job->newstate);
qemuBlockJobEventProcessConcludedTransition(job, driver, vm, asyncJob);
/* unplug the backing chains in case the job inherited them */
if (!job->disk) {
if (job->chain)
qemuBlockJobEventProcessConcludedRemoveChain(driver, vm, asyncJob,
job->chain);
if (job->mirrorChain)
qemuBlockJobEventProcessConcludedRemoveChain(driver, vm, asyncJob,
job->mirrorChain);
}
cleanup:
if (dismissed) {
qemuBlockJobUnregister(job, vm);
qemuDomainSaveConfig(vm);
}
for (i = 0; i < njobinfo; i++)
qemuMonitorJobInfoFree(jobinfo[i]);
VIR_FREE(jobinfo);
}
static void
qemuBlockJobEventProcess(virQEMUDriverPtr driver,
virDomainObjPtr vm,
qemuBlockJobDataPtr job,
qemuDomainAsyncJob asyncJob)
{
switch ((qemuBlockjobState) job->newstate) {
case QEMU_BLOCKJOB_STATE_COMPLETED:
case QEMU_BLOCKJOB_STATE_FAILED:
case QEMU_BLOCKJOB_STATE_CANCELLED:
case QEMU_BLOCKJOB_STATE_CONCLUDED:
qemuBlockJobEventProcessConcluded(job, driver, vm, asyncJob);
break;
case QEMU_BLOCKJOB_STATE_READY:
if (job->disk && job->disk->mirror) {
job->disk->mirrorState = VIR_DOMAIN_DISK_MIRROR_STATE_READY;
qemuBlockJobEmitEvents(driver, vm, job->disk, job->type, job->newstate);
}
job->state = job->newstate;
job->newstate = -1;
qemuDomainSaveStatus(vm);
break;
case QEMU_BLOCKJOB_STATE_NEW:
case QEMU_BLOCKJOB_STATE_RUNNING:
case QEMU_BLOCKJOB_STATE_LAST:
/* these are never processed as 'newstate' */
case QEMU_BLOCKJOB_STATE_ABORTING:
case QEMU_BLOCKJOB_STATE_PIVOTING:
default:
job->newstate = -1;
}
}
/**
* qemuBlockJobUpdate:
* @vm: domain
* @job: job data
* @asyncJob: current qemu asynchronous job type
*
* 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,
qemuBlockJobDataPtr job,
int asyncJob)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
if (job->newstate == -1)
return -1;
if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV))
qemuBlockJobEventProcess(priv->driver, vm, job, asyncJob);
else
qemuBlockJobEventProcessLegacy(priv->driver, vm, job, asyncJob);
return job->state;
}
/**
* qemuBlockJobSyncBegin:
* @job: block job data
* @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(qemuBlockJobDataPtr job)
{
const char *diskdst = NULL;
if (job->disk)
diskdst = job->disk->dst;
VIR_DEBUG("disk=%s", NULLSTR(diskdst));
job->synchronous = true;
}
/**
* qemuBlockJobSyncEnd:
* @vm: domain
* @disk: domain disk
*
* End a synchronous block job for @disk. Any pending block job event
* for the disk is processed. Note that it's not necessary to call this function
* in case the block job was not started successfully if
* qemuBlockJobStartupFinalize will be called.
*/
void
qemuBlockJobSyncEnd(virDomainObjPtr vm,
qemuBlockJobDataPtr job,
int asyncJob)
{
const char *diskdst = NULL;
if (job->disk)
diskdst = job->disk->dst;
VIR_DEBUG("disk=%s", NULLSTR(diskdst));
job->synchronous = false;
qemuBlockJobUpdate(vm, job, asyncJob);
}
qemuBlockJobDataPtr
qemuBlockJobGetByDisk(virDomainDiskDefPtr disk)
{
qemuBlockJobDataPtr job = QEMU_DOMAIN_DISK_PRIVATE(disk)->blockjob;
if (!job)
return NULL;
return virObjectRef(job);
}
/**
* @monitorstatus: Status of the blockjob from qemu monitor (qemuMonitorJobStatus)
*
* Converts the block job status from the monitor to the one used by
* qemuBlockJobData. If the status is unknown or does not require any handling
* QEMU_BLOCKJOB_TYPE_LAST is returned.
*/
qemuBlockjobState
qemuBlockjobConvertMonitorStatus(int monitorstatus)
{
qemuBlockjobState ret = QEMU_BLOCKJOB_STATE_LAST;
switch ((qemuMonitorJobStatus) monitorstatus) {
case QEMU_MONITOR_JOB_STATUS_READY:
ret = QEMU_BLOCKJOB_STATE_READY;
break;
case QEMU_MONITOR_JOB_STATUS_CONCLUDED:
ret = QEMU_BLOCKJOB_STATE_CONCLUDED;
break;
case QEMU_MONITOR_JOB_STATUS_UNKNOWN:
case QEMU_MONITOR_JOB_STATUS_CREATED:
case QEMU_MONITOR_JOB_STATUS_RUNNING:
case QEMU_MONITOR_JOB_STATUS_PAUSED:
case QEMU_MONITOR_JOB_STATUS_STANDBY:
case QEMU_MONITOR_JOB_STATUS_WAITING:
case QEMU_MONITOR_JOB_STATUS_PENDING:
case QEMU_MONITOR_JOB_STATUS_ABORTING:
case QEMU_MONITOR_JOB_STATUS_UNDEFINED:
case QEMU_MONITOR_JOB_STATUS_NULL:
case QEMU_MONITOR_JOB_STATUS_LAST:
default:
break;
}
return ret;
}
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