/**
* cr_hand_abort - wrapper/helper for CR_OP_HAND_ABORT
* @file: (struct file *) of the control node
* @flags: abort type
*
* DESCRIPTION:
* This function dispatches to the checkpoint-time or restart-time
* "abort" code.
*/
int cr_hand_abort(struct file *filp, unsigned int flags)
{
cr_task_t *cr_task;
int retval;
CR_KTRACE_FUNC_ENTRY();
// Lookup this task
retval = -ESRCH;
cr_task = cr_task_get(current);
if (!cr_task) {
// No matching task found.
CR_ERR("%s: No matching task found!", __FUNCTION__);
goto out_no_task;
}
// Dispatch according to the matching request
if (cr_task->chkpt_proc_req) {
retval = cr_chkpt_abort(cr_task, flags);
} else if (cr_task->rstrt_proc_req) {
retval = cr_rstrt_abort(cr_task, flags);
} else {
// No matching request found.
CR_ERR("%s: No matching request found!", __FUNCTION__);
}
cr_task_put(cr_task);
out_no_task:
CR_KTRACE_FUNC_EXIT("Returning %d", retval);
return retval;
}
// Called to wait on a barrier
int __cr_barrier_wait(cr_barrier_t *barrier)
{
#if CRI_DEBUG
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(dummy);
const int interval = 60;
int sum = 0;
do {
wait_event_timeout(barrier->wait, CR_BARRIER_WAIT_COND(barrier), interval * HZ);
if (CR_BARRIER_WAIT_COND(barrier)) break;
sum += interval;
CR_ERR("cr_barrier warning: tgid/pid %d/%d still blocked after %d seconds, with signal_pending=%d.", current->tgid, current->pid, sum, signal_pending(current));
} while (1);
smp_rmb();
if (barrier->interrupted) {
CR_ERR("cr_barrier error: interrupt on non-interruptible barrier");
}
#else
wait_event(barrier->wait, CR_BARRIER_WAIT_COND(barrier));
#endif
return do_barrier_once(barrier);
}
/**
* cr_proc_init - Initialization code
*
* DESCRIPTION:
* This function registers /proc/checkpoint and /proc/checkpoint/ctrl
*/
int __init cr_proc_init(void)
{
CR_KTRACE_FUNC_ENTRY();
proc_checkpoint = create_proc_entry("checkpoint", S_IFDIR, cr_proc_root);
if (proc_checkpoint == NULL) {
CR_ERR("proc_create_entry(/proc/checkpoint/) failed");
return -ENOMEM;
}
proc_ctrl = create_proc_entry("ctrl", S_IFREG | S_IRUGO | S_IWUGO,
proc_checkpoint);
if (proc_ctrl == NULL) {
CR_ERR("proc_create_entry(/proc/checkpoint/ctrl) failed");
return -ENOMEM;
}
proc_ctrl->proc_fops = &cr_ctrl_fops;
return 0;
}
/**
* cr_hand_complete - wrapper/helper for CR_OP_HAND_DONE
* @file: (struct file *) of the control node
*
* DESCRIPTION:
* This function dispatches to the checkpoint-time or restart-time
* post-handler "task_complete" code.
*/
int cr_hand_complete(struct file *filp, unsigned int flags)
{
cr_task_t *cr_task;
int retval;
CR_KTRACE_FUNC_ENTRY();
retval = -EINVAL;
if (flags & ~CR_HOLD_BOTH) {
CR_ERR("%s: invalid flags", __FUNCTION__);
goto out_no_task;
}
// Lookup this task
retval = -ESRCH;
cr_task = cr_task_get(current);
if (!cr_task) {
// No matching task found.
CR_ERR("%s: No matching task found!", __FUNCTION__);
goto out_no_task;
}
// Dispatch according to the matching request
if (cr_task->chkpt_proc_req) {
retval = cr_chkpt_task_complete(cr_task, flags & CR_HOLD_CONT);
} else if (cr_task->rstrt_proc_req) {
retval = cr_rstrt_task_complete(cr_task, flags & CR_HOLD_RSTRT, /* need_lock= */ 1);
} else {
// No matching request found.
CR_ERR("%s: No matching request found!", __FUNCTION__);
}
cr_task_put(cr_task);
out_no_task:
CR_KTRACE_FUNC_EXIT("Returning %d", retval);
return retval;
}
