path: root/drivers/md/dm-crypt.c

/*
 * Copyright (C) 2003 Christophe Saout <christophe@saout.de>
 * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org>
 * Copyright (C) 2006-2009 Red Hat, Inc. All rights reserved.
 *
 * This file is released under the GPL.
 */

#include <linux/completion.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/mempool.h>
#include <linux/slab.h>
#include <linux/crypto.h>
#include <linux/workqueue.h>
#include <linux/backing-dev.h>
#include <asm/atomic.h>
#include <linux/scatterlist.h>
#include <asm/page.h>
#include <asm/unaligned.h>

#include <linux/device-mapper.h>

#define DM_MSG_PREFIX "crypt"
#define MESG_STR(x) x, sizeof(x)

/*
 * context holding the current state of a multi-part conversion
 */
struct convert_context {
	struct completion restart;
	struct bio *bio_in;
	struct bio *bio_out;
	unsigned int offset_in;
	unsigned int offset_out;
	unsigned int idx_in;
	unsigned int idx_out;
	sector_t sector;
	atomic_t pending;
};

/*
 * per bio private data
 */
struct dm_crypt_io {
	struct dm_target *target;
	struct bio *base_bio;
	struct work_struct work;

	struct convert_context ctx;

	atomic_t pending;
	int error;
	sector_t sector;
	struct dm_crypt_io *base_io;
};

struct dm_crypt_request {
	struct convert_context *ctx;
	struct scatterlist sg_in;
	struct scatterlist sg_out;
};

struct crypt_config;

struct crypt_iv_operations {
	int (*ctr</