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