[libvirt] [PATCH v3 11/12] qemu_migration: Cancel running jobs on failed migration

If a migration fails, we need to stop all block jobs running so qemu doesn't try to send data to destination over and over again. --- src/qemu/qemu_migration.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c index 7d08022..f3edd51 100644 --- a/src/qemu/qemu_migration.c +++ b/src/qemu/qemu_migration.c @@ -1641,6 +1641,46 @@ qemuMigrationStopNBDServer(virQEMUDriverPtr driver, priv->nbdPort = 0; } +static void +qemuMigrationCancelDriveMirror(qemuMigrationCookiePtr mig, + virQEMUDriverPtr driver, + virDomainObjPtr vm) +{ + qemuDomainObjPrivatePtr priv = vm->privateData; + size_t i; + char *diskAlias = NULL; + + VIR_DEBUG("mig=%p nbdPort=%d", mig->nbd, priv->nbdPort); + + for (i = 0; i < vm->def->ndisks; i++) { + virDomainDiskDefPtr disk = vm->def->disks[i]; + + /* skip shared, RO and source-less disks */ + if (disk->shared || disk->readonly || !disk->src) + continue; + + VIR_FREE(diskAlias); + if (virAsprintf(&diskAlias, "%s%s", + QEMU_DRIVE_HOST_PREFIX, disk->info.alias) < 0) { + virReportOOMError(); + goto cleanup; + } + + if (qemuDomainObjEnterMonitorAsync(driver, vm, + QEMU_ASYNC_JOB_MIGRATION_OUT) < 0) + goto cleanup; + + if (qemuMonitorBlockJob(priv->mon, diskAlias, NULL, 0, + NULL, BLOCK_JOB_ABORT, true) < 0) + VIR_WARN("Unable to stop block job on %s", diskAlias); + qemuDomainObjExitMonitorWithDriver(driver, vm); + } + +cleanup: + VIR_FREE(diskAlias); + return; +} + /* Validate whether the domain is safe to migrate. If vm is NULL, * then this is being run in the v2 Prepare stage on the destination * (where we only have the target xml); if vm is provided, then this @@ -3042,6 +3082,9 @@ cleanup: if (ret < 0 && !orig_err) orig_err = virSaveLastError(); + /* cancel any outstanding NBD jobs */ + qemuMigrationCancelDriveMirror(mig, driver, vm); + if (spec->fwdType != MIGRATION_FWD_DIRECT) { if (iothread && qemuMigrationStopTunnel(iothread, ret < 0) < 0) ret = -1; @@ -4240,6 +4283,9 @@ int qemuMigrationConfirm(virQEMUDriverPtr driver, VIR_DOMAIN_EVENT_STOPPED_MIGRATED); } else { + /* cancel any outstanding NBD jobs */ + qemuMigrationCancelDriveMirror(mig, driver, vm); + /* run 'cont' on the destination, which allows migration on qemu * >= 0.10.6 to work properly. This isn't strictly necessary on * older qemu's, but it also doesn't hurt anything there -- 1.8.0.2