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Add implementation of device/file locking for metadata.

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To be used later.
This commit is contained in:
Milan Broz
2017-09-24 12:13:57 +02:00
parent a8347d2820
commit 5536b3a58d
14 changed files with 647 additions and 6 deletions
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37
lib/utils_device_locking.h Normal file
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/*
* Metadata on-disk locking for processes serialization
*
* Copyright (C) 2016-2017, Red Hat, Inc. All rights reserved.
* Copyright (C) 2016-2017, Ondrej Kozina. All rights reserved.
*
* 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;
int device_locked_readonly(struct crypt_lock_handle *h);
int device_locked(struct crypt_lock_handle *h);
struct crypt_lock_handle *device_read_lock_handle(struct crypt_device *cd, const char *device_path);
struct crypt_lock_handle *device_write_lock_handle(struct crypt_device *cd, const char *device_path);
void device_unlock_handle(struct crypt_lock_handle *h);
int device_locked_verify(int fd, struct crypt_lock_handle *h);
#endif