BLKDEV_GET_BY_DEV(9)                      The Linux VFS                      BLKDEV_GET_BY_DEV(9)



NAME
       blkdev_get_by_dev - open a block device by device number

SYNOPSIS
       struct block_device * blkdev_get_by_dev(dev_t dev, fmode_t mode, void * holder);

ARGUMENTS
       dev
           device number of block device to open

       mode
           FMODE_* mask

       holder
           exclusive holder identifier

DESCRIPTION
       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.

       On success, the returned block_device has reference count of one.

CONTEXT
       Might sleep.

RETURN
       Pointer to block_device on success, ERR_PTR(-errno) on failure.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                      BLKDEV_GET_BY_DEV(9)