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 | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index e451ef6..c8fb7ec 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -1764,6 +1764,12 @@ qemuMigrationStartNBDServer(virQEMUDriverPtr driver,
/* check whether disk should be migrated */
if (!qemuMigrateDisk(disk, nmigrate_disks, migrate_disks))
continue;
+
+ if (disk->src->readonly) {
+ virReportError(VIR_ERR_OPERATION_UNSUPPORTED,
+ _("Cannot migrate read-only disk %s"), disk->dst);
+ goto cleanup;
+ }
VIR_FREE(diskAlias);
if (!(diskAlias = qemuAliasFromDisk(disk)))
--
2.7.4
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