blkdev_get_by_dev (9) - Linux Manuals
blkdev_get_by_dev: open a block device by device number
blkdev_get_by_dev - open a block device by device number
struct block_device * blkdev_get_by_dev(dev_t
dev, fmode_t mode, void * holder);
- device number of block device to open
- FMODE_* mask
- exclusive holder identifier
Open the blockdevice described by device number dev. mode and holder are identical to blkdev_get.
Use it ONLY if you really do not have anything better - i.e. when you are behind a truly sucky interface and all you are given is a device number. _Never_ to be used for internal purposes. If you ever need it - reconsider your API.