// Device tapset
// Copyright (C) 2008, 2010 Red Hat Corp.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
%{
#include <linux/kdev_t.h>
%}
/**
* sfunction MAJOR - Extract major device number from a kernel device number (kdev_t)
*
* @dev: Kernel device number to query.
*/
function MAJOR:long(dev:long)
%{ /* pure */
STAP_RETVALUE = MAJOR(STAP_ARG_dev);
%}
/**
* sfunction MINOR - Extract minor device number from a kernel device number (kdev_t)
*
* @dev: Kernel device number to query.
*/
function MINOR:long(dev:long)
%{ /* pure */
STAP_RETVALUE = MINOR(STAP_ARG_dev);
%}
/**
* sfunction MKDEF - Creates a value that can be compared to a kernel device number (kdev_t)
*
* @major: Intended major device number.
* @minor: Intended minor device number.
*/
function MKDEV:long(major:long, minor:long)
%{ /* pure */
STAP_RETVALUE = MKDEV(STAP_ARG_major,STAP_ARG_minor);
%}
/**
* sfunction usrdev2kerndev - Converts a user-space device number into the format used in the kernel
*
* @dev: Device number in user-space format.
*/
function usrdev2kerndev:long(dev:long)
%{ /* pure */
STAP_RETVALUE = new_decode_dev(STAP_ARG_dev);
%}
function bdevname:string(bdev:long)
{
bdev = & @cast(bdev, "block_device")
if (bdev == 0)
return "N/A"
hd = bdev->bd_disk
if (bdev->bd_part)
partno = bdev->bd_part->partno
else
partno = MINOR(bdev->bd_dev) - hd->first_minor;
if (!partno)
return kernel_string(hd->disk_name)
disk_name = kernel_string(hd->disk_name)
if (isdigit(substr(disk_name, strlen(disk_name) - 1, 1)))
return sprintf("%sp%d", disk_name, partno)
else
return sprintf("%s%d", disk_name, partno)
}
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