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Filename : dev.stp
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// 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 disk_name:string(hd:long, partno:long)
{
	if (!partno)
		return kernel_string(@cast(hd, "gendisk")->disk_name)
	disk_name = kernel_string(@cast(hd, "gendisk")->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)
}

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;
	return disk_name(hd, partno)
}