Il 07/11/2013 12:01, Zhanghaoyu (A) ha scritto: > Introduce MIG_STATE_CANCELLING state to avoid starting a new migration task > while the previous one still exist. > > Signed-off-by: Zeng Junliang <zengjunli...@huawei.com> > Signed-off-by: Zhang Haoyu <haoyu.zh...@huawei.com> > --- > migration.c | 26 ++++++++++++++++---------- > 1 files changed, 16 insertions(+), 10 deletions(-) > > diff --git a/migration.c b/migration.c > index fd73b97..af8a09c 100644 > --- a/migration.c > +++ b/migration.c > @@ -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; > } >
Reviewed-by: Paolo Bonzini <pbonz...@redhat.com>