centos man page for bd_link_disk_holder

BD_LINK_DISK_HOLDER(9)						   The Linux VFS					    BD_LINK_DISK_HOLDER(9)

NAME
       bd_link_disk_holder - create symlinks between holding disk and slave bdev

SYNOPSIS
       int bd_link_disk_holder(struct block_device * bdev, struct gendisk * disk);

ARGUMENTS
       bdev
	   the claimed slave bdev

       disk
	   the holding disk

DESCRIPTION
       DON'T USE THIS UNLESS YOU'RE ALREADY USING IT.

       This functions creates the following sysfs symlinks.

       - from "slaves" directory of the holder disk to the claimed bdev - from "holders" directory of the bdev to the holder disk

       For example, if /dev/dm-0 maps to /dev/sda and disk for dm-0 is passed to bd_link_disk_holder, then:

       /sys/block/dm-0/slaves/sda --> /sys/block/sda /sys/block/sda/holders/dm-0 --> /sys/block/dm-0

       The caller must have claimed bdev before calling this function and ensure that both bdev and disk are valid during the creation and
       lifetime of these symlinks.

CONTEXT
       Might sleep.

RETURNS
       0 on success, -errno on failure.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						    BD_LINK_DISK_HOLDER(9)