NAME
blk_get_backing_dev_info - get the address of a queue’s
backing_dev_info
SYNOPSIS
struct backing_dev_info * blk_get_backing_dev_info (struct block_device * bdev);
ARGUMENTS
bdev device
DESCRIPTION
Locates the passed device’s request queue and returns the address of
its backing_dev_info
Will return NULL if the request queue cannot be located.