/*
 * Copyright (c) 2019 AVM GmbH <info@avm.de>.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef __OFFLOAD__HANDLES_H__
#define __OFFLOAD__HANDLES_H__

#include <linux/bitops.h>
#include <linux/bitmap.h>

#define HANDLE_POOL_DECLARE(name, size) DECLARE_BITMAP(name, size)

#define handle_request(candidate, pool) (!test_and_set_bit(candidate, pool))

static inline unsigned long handle_alloc(unsigned long *pool,
					 unsigned long size)
{
	unsigned long candidate;

	do {
		candidate = find_first_zero_bit(pool, size);
	} while (candidate < size && test_and_set_bit(candidate, pool));

	return candidate;
}

static inline void handle_free(unsigned long handle, unsigned long *pool)
{
	clear_bit(handle, pool);
}

#endif // __OFFLOAD__HANDLES_H__