#include struct block_device *block_device_create(void) { struct device *dev = device_alloc(); if (!dev) { return NULL; } dev->dev_type = DEV_TYPE_BLOCK; return BLOCK_DEVICE(dev); } struct block_device *block_device_from_generic(struct device *dev) { dev->dev_type = DEV_TYPE_BLOCK; return BLOCK_DEVICE(dev); }