centos man page for blkdev_get

BLKDEV_GET(9)							   The Linux VFS						     BLKDEV_GET(9)

NAME
       blkdev_get - open a block device

SYNOPSIS
       int blkdev_get(struct block_device * bdev, fmode_t mode, void * holder);

ARGUMENTS
       bdev
	   block_device to open

       mode
	   FMODE_* mask

       holder
	   exclusive holder identifier

DESCRIPTION
       Open bdev with mode. If mode includes FMODE_EXCL, bdev is open with exclusive access. Specifying FMODE_EXCL with NULLholder is invalid.
       Exclusive opens may nest for the same holder.

       On success, the reference count of bdev is unchanged. On failure, bdev is put.

CONTEXT
       Might sleep.

RETURNS
       0 on success, -errno on failure.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							     BLKDEV_GET(9)