/*

 * Metadata on-disk locking for processes serialization

 *

 * Copyright (C) 2016-2020 Red Hat, Inc. All rights reserved.

 * Copyright (C) 2016-2020 Ondrej Kozina

 *

 * 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, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 */

#ifndef _CRYPTSETUP_UTILS_LOCKING_H

#define _CRYPTSETUP_UTILS_LOCKING_H

struct crypt_device;

struct crypt_lock_handle;

struct device;

int device_locked_readonly(struct crypt_lock_handle *h);

int device_locked(struct crypt_lock_handle *h);

int device_read_lock_internal(struct crypt_device *cd, struct device *device);

int device_write_lock_internal(struct crypt_device *cd, struct device *device);

void device_unlock_internal(struct crypt_device *cd, struct device *device);

int device_locked_verify(struct crypt_device *cd, int fd, struct crypt_lock_handle *h);

int crypt_read_lock(struct crypt_device *cd, const char *name, bool blocking, struct crypt_lock_handle **lock);

int crypt_write_lock(struct crypt_device *cd, const char *name, bool blocking, struct crypt_lock_handle **lock);

void crypt_unlock_internal(struct crypt_device *cd, struct crypt_lock_handle *h);

/* Used only in device internal allocation */

void device_set_lock_handle(struct device *device, struct crypt_lock_handle *h);

struct crypt_lock_handle *device_get_lock_handle(struct device *device);

#endif