Currently Libvirt allows attempts to migrate read only disks. Qemu cannot
handle this as read only
disks cannot be written to on the destination system. The end result is a
cryptic error message
and a failed migration.
This patch causes migration to fail earlier and provides a meaningful error
message stating that
migrating read only disks is not supported.
Signed-off-by: Corey S. McQuay <csmcq...@linux.vnet.ibm.com>
Reviewed-by: Jason J. Herne <jjhe...@linux.vnet.ibm.com>
Reviewed-by: Boris Fiuczynski <fiu...@linux.vnet.ibm.com>
---
src/qemu/qemu_migration.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index e451ef6..3311711 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -2392,6 +2392,28 @@ qemuMigrationIsSafe(virDomainDefPtr def,
return true;
}
+static bool
+qemuMigrationAreAllDisksRW(virDomainDefPtr def,
+ size_t nmigrate_disks,
+ const char **migrate_disks)
+{
+ size_t i;
+
+ for (i = 0; i < def->ndisks; i++) {
+ virDomainDiskDefPtr disk = def->disks[i];
+
+ if (qemuMigrateDisk(disk, nmigrate_disks, migrate_disks) &&
+ disk->src->readonly) {
+ virReportError(VIR_ERR_OPERATION_UNSUPPORTED,
+ _("Cannot migrate read-only disk %s"),
+ disk->dst);
+ return false;
+ }
+ }
+
+ return true;
+}
+
/** qemuMigrationSetOffline
* Pause domain for non-live migration.
*/
@@ -3137,6 +3159,9 @@ qemuMigrationBeginPhase(virQEMUDriverPtr driver,
!qemuMigrationIsSafe(vm->def, nmigrate_disks, migrate_disks))
goto cleanup;
+ if (!qemuMigrationAreAllDisksRW(vm->def, nmigrate_disks, migrate_disks))
+ goto cleanup;
+
if (flags & VIR_MIGRATE_POSTCOPY &&
(!(flags & VIR_MIGRATE_LIVE) ||
flags & VIR_MIGRATE_PAUSED)) {
--
2.7.4
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