C++ (Cpp) security_task_setioprio примеры использования

Пример #1

Файл: ioprio.c Проект: garyvan/openwrt-1.6

int set_task_ioprio(struct task_struct *task, int ioprio)
{
	int err;
	struct io_context *ioc;
	const struct cred *cred = current_cred(), *tcred;

	rcu_read_lock();
	tcred = __task_cred(task);
	if (!uid_eq(tcred->uid, cred->euid) &&
	    !uid_eq(tcred->uid, cred->uid) && !capable(CAP_SYS_NICE)) {
		rcu_read_unlock();
		return -EPERM;
	}
	rcu_read_unlock();

	err = security_task_setioprio(task, ioprio);
	if (err)
		return err;

	ioc = get_task_io_context(task, GFP_ATOMIC, NUMA_NO_NODE);
	if (ioc) {
		ioc->ioprio = ioprio;
		put_io_context(ioc);
	}

	return err;
}

Пример #2

int set_task_ioprio(struct task_struct *task, int ioprio)
{
#ifdef CONFIG_IOSCHED_BFQ
	int err, i;
#else
	int err;
#endif
	struct io_context *ioc;
	const struct cred *cred = current_cred(), *tcred;

	rcu_read_lock();
	tcred = __task_cred(task);
	if (tcred->uid != cred->euid &&
	    tcred->uid != cred->uid && !capable(CAP_SYS_NICE)) {
		rcu_read_unlock();
		return -EPERM;
	}
	rcu_read_unlock();

	err = security_task_setioprio(task, ioprio);
	if (err)
		return err;

	task_lock(task);
	do {
		ioc = task->io_context;
		/* see wmb() in current_io_context() */
		smp_read_barrier_depends();
		if (ioc)
			break;

		ioc = alloc_io_context(GFP_ATOMIC, -1);
		if (!ioc) {
			err = -ENOMEM;
			break;
		}
#ifdef CONFIG_IOSCHED_BFQ
		/* let other ioc users see the new values */
		smp_wmb();
#endif
		task->io_context = ioc;
	} while (1);

	if (!err) {
		ioc->ioprio = ioprio;
#ifdef CONFIG_IOSCHED_BFQ
		/* make sure schedulers see the new ioprio value */
		wmb();
		for (i = 0; i < IOC_IOPRIO_CHANGED_BITS; i++)
			set_bit(i, ioc->ioprio_changed);
#else
		ioc->ioprio_changed = 1;
#endif
	}

	task_unlock(task);
	return err;
}

Пример #3

Файл: ioprio.c Проект: hounjini/htc-rider-cm-kernel

int set_task_ioprio(struct task_struct *task, int ioprio)
{
	int err, i;
	struct io_context *ioc;
	const struct cred *cred = current_cred(), *tcred;

	rcu_read_lock();
	tcred = __task_cred(task);
	if (tcred->uid != cred->euid &&
	    tcred->uid != cred->uid && !capable(CAP_SYS_NICE)) {
		rcu_read_unlock();
		return -EPERM;
	}
	rcu_read_unlock();

	err = security_task_setioprio(task, ioprio);
	if (err)
		return err;

	task_lock(task);
	do {
		ioc = task->io_context;
		/* see wmb() in current_io_context() */
		smp_read_barrier_depends();
		if (ioc)
			break;

		ioc = alloc_io_context(GFP_ATOMIC, -1);
		if (!ioc) {
			err = -ENOMEM;
			break;
		}
		smp_wmb();
		task->io_context = ioc;
	} while (1);

	if (!err) {
		ioc->ioprio = ioprio;
		wmb();
		for (i = 0; i < IOC_IOPRIO_CHANGED_BITS; i++)
			set_bit(i, ioc->ioprio_changed);
	}

	task_unlock(task);
	return err;
}