If bdrv_flush_all() returns an error, there is an inconsistency in the
view of an image file between the source and the destination host.
Completing the migration would lead to corruption. Better abort
migration in this case.
To reproduce this case, try the following (ensures that there is
something to flush, and then fails that flush):
$ qemu-img create -f qcow2 test.qcow2 1G
$ cat blkdebug.cfg
[inject-error]
event = "flush_to_os"
errno = "5"
$ qemu-system-x86_64 -hda blkdebug:blkdebug.cfg:test.qcow2 -monitor stdio
(qemu) qemu-io ide0-hd0 "write 0 4k"
(qemu) migrate ...
Signed-off-by: Kevin Wolf <kw...@redhat.com>
---
migration.c | 17 ++++++++++++++---
1 file changed, 14 insertions(+), 3 deletions(-)
diff --git a/migration.c b/migration.c
index a704d48..f7ae061 100644
--- a/migration.c
+++ b/migration.c
@@ -528,15 +528,26 @@ static void *migration_thread(void *opaque)
if (pending_size && pending_size >= max_size) {
qemu_savevm_state_iterate(s->file);
} else {
+ int ret;
+
DPRINTF("done iterating\n");
qemu_mutex_lock_iothread();
start_time = qemu_get_clock_ms(rt_clock);
qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
old_vm_running = runstate_is_running();
- vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
- qemu_file_set_rate_limit(s->file, INT_MAX);
- qemu_savevm_state_complete(s->file);
+
+ ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
+ if (ret >= 0) {
+ qemu_file_set_rate_limit(s->file, INT_MAX);
+ qemu_savevm_state_complete(s->file);
+ }
qemu_mutex_unlock_iothread();
+
+ if (ret < 0) {
+ migrate_finish_set_state(s, MIG_STATE_ERROR);
+ break;
+ }
+
if (!qemu_file_get_error(s->file)) {
migrate_finish_set_state(s, MIG_STATE_COMPLETED);
break;
--
1.8.1.4
