[libvirt] [PATCH v3 11/24] qemu: Cancel disk mirrors after libvirtd restart
Jiri Denemark
jdenemar at redhat.com
Wed Jun 10 13:42:45 UTC 2015
When libvirtd is restarted during migration, we properly cancel the
ongoing migration (unless it managed to almost finished before the
restart). But if we were also migrating storage using NBD, we would
completely forget about the running disk mirrors.
Signed-off-by: Jiri Denemark <jdenemar at redhat.com>
---
Notes:
ACKed in version 2
Version 3:
- no change
Version 2:
- make use of qemuMonitorGetAllBlockJobInfo introduced by the previous patch
- undo qemuBlockJobSyncBegin in case of error
src/qemu/qemu_domain.c | 45 ++++++++++++++++++++++++-
src/qemu/qemu_migration.c | 85 +++++++++++++++++++++++++++++++++++++++++++++++
src/qemu/qemu_migration.h | 3 ++
src/qemu/qemu_process.c | 8 +----
4 files changed, 133 insertions(+), 8 deletions(-)
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 24ff020..68b6a95 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -578,7 +578,27 @@ qemuDomainObjPrivateXMLFormat(virBufferPtr buf,
qemuDomainAsyncJobPhaseToString(
priv->job.asyncJob, priv->job.phase));
}
- virBufferAddLit(buf, "/>\n");
+ if (priv->job.asyncJob != QEMU_ASYNC_JOB_MIGRATION_OUT) {
+ virBufferAddLit(buf, "/>\n");
+ } else {
+ size_t i;
+ virDomainDiskDefPtr disk;
+ qemuDomainDiskPrivatePtr diskPriv;
+
+ virBufferAddLit(buf, ">\n");
+ virBufferAdjustIndent(buf, 2);
+
+ for (i = 0; i < vm->def->ndisks; i++) {
+ disk = vm->def->disks[i];
+ diskPriv = QEMU_DOMAIN_DISK_PRIVATE(disk);
+ virBufferAsprintf(buf, "<disk dev='%s' migrating='%s'/>\n",
+ disk->dst,
+ diskPriv->migrating ? "yes" : "no");
+ }
+
+ virBufferAdjustIndent(buf, -2);
+ virBufferAddLit(buf, "</job>\n");
+ }
}
priv->job.active = job;
@@ -736,6 +756,29 @@ qemuDomainObjPrivateXMLParse(xmlXPathContextPtr ctxt,
}
}
+ if ((n = virXPathNodeSet("./job[1]/disk[@migrating='yes']",
+ ctxt, &nodes)) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("failed to parse list of disks marked for migration"));
+ goto error;
+ }
+ if (n > 0) {
+ if (priv->job.asyncJob != QEMU_ASYNC_JOB_MIGRATION_OUT) {
+ VIR_WARN("Found disks marked for migration but we were not "
+ "migrating");
+ n = 0;
+ }
+ for (i = 0; i < n; i++) {
+ char *dst = virXMLPropString(nodes[i], "dev");
+ virDomainDiskDefPtr disk;
+
+ if (dst && (disk = virDomainDiskByName(vm->def, dst, false)))
+ QEMU_DOMAIN_DISK_PRIVATE(disk)->migrating = true;
+ VIR_FREE(dst);
+ }
+ }
+ VIR_FREE(nodes);
+
priv->fakeReboot = virXPathBoolean("boolean(./fakereboot)", ctxt) == 1;
if ((n = virXPathNodeSet("./devices/device", ctxt, &nodes)) < 0) {
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 065a0f9..e0de09e 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -2000,6 +2000,7 @@ qemuMigrationDriveMirror(virQEMUDriverPtr driver,
char *hoststr = NULL;
unsigned int mirror_flags = VIR_DOMAIN_BLOCK_REBASE_REUSE_EXT;
int rv;
+ virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
VIR_DEBUG("Starting drive mirrors for domain %s", vm->def->name);
@@ -2049,6 +2050,11 @@ qemuMigrationDriveMirror(virQEMUDriverPtr driver,
goto cleanup;
}
diskPriv->migrating = true;
+
+ if (virDomainSaveStatus(driver->xmlopt, cfg->stateDir, vm) < 0) {
+ VIR_WARN("Failed to save status on vm %s", vm->def->name);
+ goto cleanup;
+ }
}
while ((rv = qemuMigrationDriveMirrorReady(driver, vm)) != 1) {
@@ -2076,6 +2082,7 @@ qemuMigrationDriveMirror(virQEMUDriverPtr driver,
ret = 0;
cleanup:
+ virObjectUnref(cfg);
VIR_FREE(diskAlias);
VIR_FREE(nbd_dest);
VIR_FREE(hoststr);
@@ -5698,6 +5705,84 @@ qemuMigrationToFile(virQEMUDriverPtr driver, virDomainObjPtr vm,
return ret;
}
+
+int
+qemuMigrationCancel(virQEMUDriverPtr driver,
+ virDomainObjPtr vm)
+{
+ qemuDomainObjPrivatePtr priv = vm->privateData;
+ virHashTablePtr blockJobs = NULL;
+ bool storage = false;
+ size_t i;
+ int ret = -1;
+
+ VIR_DEBUG("Canceling unfinished outgoing migration of domain %s",
+ vm->def->name);
+
+ for (i = 0; i < vm->def->ndisks; i++) {
+ virDomainDiskDefPtr disk = vm->def->disks[i];
+ if (QEMU_DOMAIN_DISK_PRIVATE(disk)->migrating) {
+ qemuBlockJobSyncBegin(disk);
+ storage = true;
+ }
+ }
+
+ qemuDomainObjEnterMonitor(driver, vm);
+
+ ignore_value(qemuMonitorMigrateCancel(priv->mon));
+ if (storage)
+ blockJobs = qemuMonitorGetAllBlockJobInfo(priv->mon);
+
+ if (qemuDomainObjExitMonitor(driver, vm) < 0 || (storage && !blockJobs))
+ goto endsyncjob;
+
+ if (!storage) {
+ ret = 0;
+ goto cleanup;
+ }
+
+ for (i = 0; i < vm->def->ndisks; i++) {
+ virDomainDiskDefPtr disk = vm->def->disks[i];
+ qemuDomainDiskPrivatePtr diskPriv = QEMU_DOMAIN_DISK_PRIVATE(disk);
+
+ if (!diskPriv->migrating)
+ continue;
+
+ if (virHashLookup(blockJobs, disk->info.alias)) {
+ VIR_DEBUG("Drive mirror on disk %s is still running", disk->dst);
+ } else {
+ VIR_DEBUG("Drive mirror on disk %s is gone", disk->dst);
+ qemuBlockJobSyncEnd(driver, vm, disk);
+ diskPriv->migrating = false;
+ }
+ }
+
+ if (qemuMigrationCancelDriveMirror(driver, vm, false,
+ QEMU_ASYNC_JOB_NONE) < 0)
+ goto endsyncjob;
+
+ ret = 0;
+
+ cleanup:
+ virHashFree(blockJobs);
+ return ret;
+
+ endsyncjob:
+ if (storage) {
+ for (i = 0; i < vm->def->ndisks; i++) {
+ virDomainDiskDefPtr disk = vm->def->disks[i];
+ qemuDomainDiskPrivatePtr diskPriv = QEMU_DOMAIN_DISK_PRIVATE(disk);
+
+ if (diskPriv->migrating) {
+ qemuBlockJobSyncEnd(driver, vm, disk);
+ diskPriv->migrating = false;
+ }
+ }
+ }
+ goto cleanup;
+}
+
+
int
qemuMigrationJobStart(virQEMUDriverPtr driver,
virDomainObjPtr vm,
diff --git a/src/qemu/qemu_migration.h b/src/qemu/qemu_migration.h
index 1726455..e47bde5 100644
--- a/src/qemu/qemu_migration.h
+++ b/src/qemu/qemu_migration.h
@@ -177,4 +177,7 @@ int qemuMigrationToFile(virQEMUDriverPtr driver, virDomainObjPtr vm,
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(5)
ATTRIBUTE_RETURN_CHECK;
+int qemuMigrationCancel(virQEMUDriverPtr driver,
+ virDomainObjPtr vm);
+
#endif /* __QEMU_MIGRATION_H__ */
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 3c9d4bc..5be0002 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -3354,8 +3354,6 @@ qemuProcessRecoverMigration(virQEMUDriverPtr driver,
virDomainState state,
int reason)
{
- qemuDomainObjPrivatePtr priv = vm->privateData;
-
if (job == QEMU_ASYNC_JOB_MIGRATION_IN) {
switch (phase) {
case QEMU_MIGRATION_PHASE_NONE:
@@ -3409,11 +3407,7 @@ qemuProcessRecoverMigration(virQEMUDriverPtr driver,
case QEMU_MIGRATION_PHASE_PERFORM3:
/* migration is still in progress, let's cancel it and resume the
* domain */
- VIR_DEBUG("Canceling unfinished outgoing migration of domain %s",
- vm->def->name);
- qemuDomainObjEnterMonitor(driver, vm);
- ignore_value(qemuMonitorMigrateCancel(priv->mon));
- if (qemuDomainObjExitMonitor(driver, vm) < 0)
+ if (qemuMigrationCancel(driver, vm) < 0)
return -1;
/* resume the domain but only if it was paused as a result of
* migration */
--
2.4.3
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