linux/crypto/async_tx/async_raid6_recov.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Asynchronous RAID-6 recovery calculations ASYNC_TX API.
 * Copyright(c) 2009 Intel Corporation
 *
 * based on raid6recov.c:
 *   Copyright 2002 H. Peter Anvin
 */
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/raid/pq.h>
#include <linux/async_tx.h>
#include <linux/dmaengine.h>

static struct dma_async_tx_descriptor *
async_sum_product(struct page *dest, unsigned int d_off,
		struct page **srcs, unsigned int *src_offs, unsigned char *coef,
		size_t len, struct async_submit_ctl *submit)
{ … }

static struct dma_async_tx_descriptor *
async_mult(struct page *dest, unsigned int d_off, struct page *src,
		unsigned int s_off, u8 coef, size_t len,
		struct async_submit_ctl *submit)
{ … }

static struct dma_async_tx_descriptor *
__2data_recov_4(int disks, size_t bytes, int faila, int failb,
		struct page **blocks, unsigned int *offs,
		struct async_submit_ctl *submit)
{ … }

static struct dma_async_tx_descriptor *
__2data_recov_5(int disks, size_t bytes, int faila, int failb,
		struct page **blocks, unsigned int *offs,
		struct async_submit_ctl *submit)
{ … }

static struct dma_async_tx_descriptor *
__2data_recov_n(int disks, size_t bytes, int faila, int failb,
	      struct page **blocks, unsigned int *offs,
		  struct async_submit_ctl *submit)
{ … }

/**
 * async_raid6_2data_recov - asynchronously calculate two missing data blocks
 * @disks: number of disks in the RAID-6 array
 * @bytes: block size
 * @faila: first failed drive index
 * @failb: second failed drive index
 * @blocks: array of source pointers where the last two entries are p and q
 * @offs: array of offset for pages in blocks
 * @submit: submission/completion modifiers
 */
struct dma_async_tx_descriptor *
async_raid6_2data_recov(int disks, size_t bytes, int faila, int failb,
			struct page **blocks, unsigned int *offs,
			struct async_submit_ctl *submit)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * async_raid6_datap_recov - asynchronously calculate a data and the 'p' block
 * @disks: number of disks in the RAID-6 array
 * @bytes: block size
 * @faila: failed drive index
 * @blocks: array of source pointers where the last two entries are p and q
 * @offs: array of offset for pages in blocks
 * @submit: submission/completion modifiers
 */
struct dma_async_tx_descriptor *
async_raid6_datap_recov(int disks, size_t bytes, int faila,
			struct page **blocks, unsigned int *offs,
			struct async_submit_ctl *submit)
{ … }
EXPORT_SYMBOL_GPL(…);

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;