mirror of
git://sourceware.org/git/lvm2.git
synced 2024-12-22 17:35:59 +03:00
45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
/*
|
|
* Copyright (C) 2010 Red Hat, Inc. All rights reserved.
|
|
*
|
|
* This file is part of LVM2.
|
|
*
|
|
* This copyrighted material is made available to anyone wishing to use,
|
|
* modify, copy, or redistribute it subject to the terms and conditions
|
|
* of the GNU Lesser General Public License v.2.1.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with this program; if not, write to the Free Software Foundation,
|
|
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#ifndef _LVM_PERCENT_H
|
|
#define _LVM_PERCENT_H
|
|
#include <stdint.h>
|
|
|
|
/*
|
|
* A fixed-point representation of percent values. One percent equals to
|
|
* PERCENT_1 as defined below. Values that are not multiples of PERCENT_1
|
|
* represent fractions, with precision of 1/1000000 of a percent. See
|
|
* percent_to_float for a conversion to a floating-point representation.
|
|
*
|
|
* You should always use make_percent when building percent_t values. The
|
|
* implementation of make_percent is biased towards the middle: it ensures that
|
|
* the result is PERCENT_0 or PERCENT_100 if and only if this is the actual
|
|
* value -- it never rounds any intermediate value (> 0 or < 100) to either 0
|
|
* or 100.
|
|
*/
|
|
typedef int32_t percent_t;
|
|
|
|
typedef enum {
|
|
PERCENT_0 = 0,
|
|
PERCENT_1 = 1000000,
|
|
PERCENT_100 = 100 * PERCENT_1,
|
|
PERCENT_INVALID = -1,
|
|
PERCENT_MERGE_FAILED = -2
|
|
} percent_range_t;
|
|
|
|
float percent_to_float(percent_t v);
|
|
percent_t make_percent(uint64_t numerator, uint64_t denominator);
|
|
|
|
#endif
|