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qemuMigrationSrcRun: Don't attempt any storage migration if no disks will be migrated

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Don't even try to setup storage migration if there are no eligible
disks.

This also fixes migration from older libvirts which didn't format an
empty <nbd/> element in the migration cookie if there weren't any disks
to migrate.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Tested-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Peter Krempa 2021-04-13 17:17:42 +02:00
parent da69f4b208
commit 763a88a358
1 changed files with 21 additions and 0 deletions
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21
src/qemu/qemu_migration.c
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@ -312,6 +312,22 @@ qemuMigrationAnyCopyDisk(virDomainDiskDef const *disk,
}
static bool
qemuMigrationHasAnyStorageMigrationDisks(virDomainDef *def,
const char **migrate_disks,
size_t nmigrate_disks)
{
size_t i;
for (i = 0; i < def->ndisks; i++) {
if (qemuMigrationAnyCopyDisk(def->disks[i], nmigrate_disks, migrate_disks))
return true;
}
return false;
}
static int
qemuMigrationDstPrecreateStorage(virDomainObj *vm,
qemuMigrationCookieNBD *nbd,
@ -4011,6 +4027,11 @@ qemuMigrationSrcRun(virQEMUDriver *driver,
spec, spec->destType, spec->fwdType, dconn,
NULLSTR(graphicsuri), nmigrate_disks, migrate_disks);
if (storageMigration)
storageMigration = qemuMigrationHasAnyStorageMigrationDisks(vm->def,
migrate_disks,
nmigrate_disks);
if (storageMigration) {
cookieFlags |= QEMU_MIGRATION_COOKIE_NBD;