'\" t
.\"     Title: blkdev_get_by_dev
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: September 2017
.\"    Manual: The Linux VFS
.\"    Source: Kernel Hackers Manual 4.12.13
.\"  Language: English
.\"
.TH "BLKDEV_GET_BY_DEV" "9" "September 2017" "Kernel Hackers Manual 4\&.12\&" "The Linux VFS"
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.SH "NAME"
blkdev_get_by_dev \- open a block device by device number
.SH "SYNOPSIS"
.HP \w'struct\ block_device\ *\ blkdev_get_by_dev('u
.BI "struct block_device * blkdev_get_by_dev(dev_t\ " "dev" ", fmode_t\ " "mode" ", void\ *\ " "holder" ");"
.SH "ARGUMENTS"
.PP
\fIdev_t dev\fR
.RS 4
device number of block device to open
.RE
.PP
\fIfmode_t mode\fR
.RS 4
FMODE_* mask
.RE
.PP
\fIvoid * holder\fR
.RS 4
exclusive holder identifier
.RE
.SH "DESCRIPTION"
.PP
Open the blockdevice described by device number
\fIdev\fR\&.
\fImode\fR
and
\fIholder\fR
are identical to
\fBblkdev_get\fR\&.
.PP
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\&.
.PP
On success, the returned block_device has reference count of one\&.
.SH "CONTEXT"
.PP
Might sleep\&.
.SH "RETURN"
.PP
Pointer to block_device on success, ERR_PTR(\-errno) on failure\&.
.SH "COPYRIGHT"
.br