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introduce MIG_STATE_CANCELLING state 

Introduce MIG_STATE_CANCELLING state to avoid starting a new migration task while the previous one still exist.

Signed-off-by: Zeng Junliang <zengjunliang@huawei.com>
Signed-off-by: Zhang Haoyu <haoyu.zhang@huawei.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Zhanghaoyu (A) 2013-11-07 11:01:15 +00:00 committed by Juan Quintela
parent 6f2b811a61
commit 51cf4c1a99
1 changed files with 16 additions and 10 deletions
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26
migration.c
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@ -40,6 +40,7 @@ enum {
MIG_STATE_ERROR = -1,
MIG_STATE_NONE,
MIG_STATE_SETUP,
MIG_STATE_CANCELLING,
MIG_STATE_CANCELLED,
MIG_STATE_ACTIVE,
MIG_STATE_COMPLETED,
@ -196,6 +197,7 @@ MigrationInfo *qmp_query_migrate(Error **errp)
info->has_total_time = false;
break;
case MIG_STATE_ACTIVE:
case MIG_STATE_CANCELLING:
info->has_status = true;
info->status = g_strdup("active");
info->has_total_time = true;
@ -282,6 +284,13 @@ void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
/* shared migration helpers */
static void migrate_set_state(MigrationState *s, int old_state, int new_state)
{
if (atomic_cmpxchg(&s->state, old_state, new_state) == new_state) {
trace_migrate_set_state(new_state);
}
}
static void migrate_fd_cleanup(void *opaque)
{
MigrationState *s = opaque;
@ -303,18 +312,14 @@ static void migrate_fd_cleanup(void *opaque)
if (s->state != MIG_STATE_COMPLETED) {
qemu_savevm_state_cancel();
if (s->state == MIG_STATE_CANCELLING) {
migrate_set_state(s, MIG_STATE_CANCELLING, MIG_STATE_CANCELLED);
}
}
notifier_list_notify(&migration_state_notifiers, s);
}
static void migrate_set_state(MigrationState *s, int old_state, int new_state)
{
if (atomic_cmpxchg(&s->state, old_state, new_state) == new_state) {
trace_migrate_set_state(new_state);
}
}
void migrate_fd_error(MigrationState *s)
{
DPRINTF("setting error state\n");
@ -334,8 +339,8 @@ static void migrate_fd_cancel(MigrationState *s)
if (old_state != MIG_STATE_SETUP && old_state != MIG_STATE_ACTIVE) {
break;
}
migrate_set_state(s, old_state, MIG_STATE_CANCELLED);
} while (s->state != MIG_STATE_CANCELLED);
migrate_set_state(s, old_state, MIG_STATE_CANCELLING);
} while (s->state != MIG_STATE_CANCELLING);
}
void add_migration_state_change_notifier(Notifier *notify)
@ -412,7 +417,8 @@ void qmp_migrate(const char *uri, bool has_blk, bool blk,
params.blk = has_blk && blk;
params.shared = has_inc && inc;
if (s->state == MIG_STATE_ACTIVE || s->state == MIG_STATE_SETUP) {
if (s->state == MIG_STATE_ACTIVE || s->state == MIG_STATE_SETUP ||
s->state == MIG_STATE_CANCELLING) {
error_set(errp, QERR_MIGRATION_ACTIVE);
return;
}