[libvirt] [PATCH v2 08/11] qemu_migration: Implement qemuMigrationStartNBDServer()

We need to start NBD server and feed it with all non-<shared/> disks. However, after qemuDomainObjEnterMonitorAsync the domain object is unlocked so we cannot touch its disk definitions. Therefore, we must prepare the list of disk IDs prior entering monitor. --- src/qemu/qemu_migration.c | 59 +++++++++++++++++++++++++++++++++++++++++++- 1 files changed, 57 insertions(+), 2 deletions(-) diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c index 9ad3ee7..9177777 100644 --- a/src/qemu/qemu_migration.c +++ b/src/qemu/qemu_migration.c @@ -33,6 +33,7 @@ #include "qemu_domain.h" #include "qemu_process.h" #include "qemu_capabilities.h" +#include "qemu_command.h" #include "qemu_cgroup.h" #include "domain_audit.h" @@ -1107,8 +1108,62 @@ qemuMigrationStartNBDServer(virQEMUDriverPtr driver ATTRIBUTE_UNUSED, virDomainObjPtr vm ATTRIBUTE_UNUSED, int *nbdPort ATTRIBUTE_UNUSED) { - /* do nothing for now */ - return 0; + int ret = -1; + qemuDomainObjPrivatePtr priv = vm->privateData; + int port = qemuMigrationNextPort(); + const char *listen = "0.0.0.0"; + char **disks = NULL; + size_t i, ndisks = 0; + + for (i = 0; i < vm->def->ndisks; i++) { + virDomainDiskDefPtr disk = vm->def->disks[i]; + + /* skip shared disks */ + if (disk->shared) + continue; + + if (VIR_REALLOC_N(disks, ndisks + 1) < 0) { + virReportOOMError(); + goto cleanup; + } + + if (virAsprintf(&disks[ndisks++], "%s%s", + QEMU_DRIVE_HOST_PREFIX, disk->info.alias) < 0) { + virReportOOMError(); + goto cleanup; + } + } + + if (!ndisks) { + /* Hooray! Nothing to care about */ + ret = 0; + goto cleanup; + } + + if (qemuDomainObjEnterMonitorAsync(driver, vm, + QEMU_ASYNC_JOB_MIGRATION_IN) < 0) + goto cleanup; + + if (qemuMonitorNBDServerStart(priv->mon, listen, port) < 0) + goto endjob; + + for (i = 0; i < ndisks; i++) { + if (qemuMonitorNBDServerAdd(priv->mon, disks[i], true) < 0) { + VIR_WARN("Unable to add '%s' to NDB server", disks[i]); + goto endjob; + } + } + + *nbdPort = port; + ret = 0; + +endjob: + qemuDomainObjExitMonitorWithDriver(driver, vm); +cleanup: + for (i = 0; i < ndisks; i++) + VIR_FREE(disks[i]); + VIR_FREE(disks); + return ret; } -- 1.7.8.6