'\" t
.\"     Title: bd_link_disk_holder
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: June 2017
.\"    Manual: The Linux VFS
.\"    Source: Kernel Hackers Manual 4.9.30
.\"  Language: English
.\"
.TH "BD_LINK_DISK_HOLDER" "9" "June 2017" "Kernel Hackers Manual 4\&.9\&." "The Linux VFS"
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.SH "NAME"
bd_link_disk_holder \- create symlinks between holding disk and slave bdev
.SH "SYNOPSIS"
.HP \w'int\ bd_link_disk_holder('u
.BI "int bd_link_disk_holder(struct\ block_device\ *\ " "bdev" ", struct\ gendisk\ *\ " "disk" ");"
.SH "ARGUMENTS"
.PP
\fIbdev\fR
.RS 4
the claimed slave bdev
.RE
.PP
\fIdisk\fR
.RS 4
the holding disk
.RE
.SH "DESCRIPTION"
.PP
DON\*(AqT USE THIS UNLESS YOU\*(AqRE ALREADY USING IT\&.
.PP
This functions creates the following sysfs symlinks\&.
.PP
\- from
\(lqslaves\(rq
directory of the holder
\fIdisk\fR
to the claimed
\fIbdev\fR
\- from
\(lqholders\(rq
directory of the
\fIbdev\fR
to the holder
\fIdisk\fR
.PP
For example, if /dev/dm\-0 maps to /dev/sda and disk for dm\-0 is passed to
\fBbd_link_disk_holder\fR, then:
.PP
/sys/block/dm\-0/slaves/sda \-\-> /sys/block/sda /sys/block/sda/holders/dm\-0 \-\-> /sys/block/dm\-0
.PP
The caller must have claimed
\fIbdev\fR
before calling this function and ensure that both
\fIbdev\fR
and
\fIdisk\fR
are valid during the creation and lifetime of these symlinks\&.
.SH "CONTEXT"
.PP
Might sleep\&.
.SH "RETURN"
.PP
0 on success, \-errno on failure\&.
.SH "COPYRIGHT"
.br