C++ (Cpp) dasd_set_target_state Examples

Example #1

File: dasd_ioctl.c Project: ARMWorks/FA_2440_Linux_Kernel

/*
 * Disable device.
 * Used by dasdfmt. Disable I/O operations but allow ioctls.
 */
static int
dasd_ioctl_disable(struct block_device *bdev)
{
	struct dasd_block *block = bdev->bd_disk->private_data;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	/*
	 * Man this is sick. We don't do a real disable but only downgrade
	 * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
	 * BIODASDDISABLE to disable accesses to the device via the block
	 * device layer but it still wants to do i/o on the device by
	 * using the BIODASDFMT ioctl. Therefore the correct state for the
	 * device is DASD_STATE_BASIC that allows to do basic i/o.
	 */
	dasd_set_target_state(block->base, DASD_STATE_BASIC);
	/*
	 * Set i_size to zero, since read, write, etc. check against this
	 * value.
	 */
	mutex_lock(&bdev->bd_mutex);
	i_size_write(bdev->bd_inode, 0);
	mutex_unlock(&bdev->bd_mutex);
	return 0;
}

Example #2

static int
dasd_ioctl_disable(struct block_device *bdev)
{
	struct dasd_block *block = bdev->bd_disk->private_data;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	
	dasd_set_target_state(block->base, DASD_STATE_BASIC);
	
	mutex_lock(&bdev->bd_mutex);
	i_size_write(bdev->bd_inode, 0);
	mutex_unlock(&bdev->bd_mutex);
	return 0;
}