/**
* Main kernel entry function to restart a checkpointed task.
* @author Geoffroy Vallée, Matthieu Fertré
*
* @param app Application
* @param pid Pid of the task to restart
* @param flags Option flags
*
* @return New task if success, PTR_ERR if failure
*/
struct task_struct *restart_process(struct app_struct *app, pid_t pid,
int flags)
{
struct epm_action action;
struct task_struct *task;
/* Check if the process has not been already restarted */
if (find_task_by_kpid(pid) != NULL)
return ERR_PTR(-EALREADY);
action.type = EPM_RESTART;
action.restart.appid = app->app_id;
action.restart.shared = CR_LINK_ONLY;
action.restart.app = app;
action.restart.flags = flags;
BUG_ON(!action.restart.app);
task = restart_task(&action, pid, app->app_id, app->chkpt_sn);
if (IS_ERR(task))
epm_error(&action, PTR_ERR(task), NULL,
"Fail to restart process %d",
pid);
return task;
}
static inline long __get_appid_from_local_pid(pid_t pid)
{
struct task_struct * task;
rcu_read_lock();
task = find_task_by_kpid(pid);
rcu_read_unlock();
if (task)
return __get_appid_from_task(task);
return -ESRCH;
}
