cregit-Linux how code gets into the kernel

Release 4.11 crypto/scatterwalk.c

Directory: crypto
/*
 * Cryptographic API.
 *
 * Cipher operations.
 *
 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
 *               2002 Adam J. Richter <adam@yggdrasil.com>
 *               2004 Jean-Luc Cooke <jlcooke@certainkey.com>
 *
 * 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.
 *
 */

#include <crypto/scatterwalk.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/scatterlist.h>


static inline void memcpy_dir(void *buf, void *sgdata, size_t nbytes, int out) { void *src = out ? buf : sgdata; void *dst = out ? sgdata : buf; memcpy(dst, src, nbytes); }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton3060.00%150.00%
Herbert Xu2040.00%150.00%
Total50100.00%2100.00%


void scatterwalk_copychunks(void *buf, struct scatter_walk *walk, size_t nbytes, int out) { for (;;) { unsigned int len_this_page = scatterwalk_pagelen(walk); u8 *vaddr; if (len_this_page > nbytes) len_this_page = nbytes; if (out != 2) { vaddr = scatterwalk_map(walk); memcpy_dir(buf, vaddr, len_this_page, out); scatterwalk_unmap(vaddr); } scatterwalk_advance(walk, len_this_page); if (nbytes == len_this_page) break; buf += len_this_page; nbytes -= len_this_page; scatterwalk_pagedone(walk, out & 1, 1); } }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu6153.51%466.67%
Andrew Morton4741.23%116.67%
J. Bruce Fields65.26%116.67%
Total114100.00%6100.00%

EXPORT_SYMBOL_GPL(scatterwalk_copychunks);
void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg, unsigned int start, unsigned int nbytes, int out) { struct scatter_walk walk; struct scatterlist tmp[2]; if (!nbytes) return; sg = scatterwalk_ffwd(tmp, sg, start); scatterwalk_start(&walk, sg); scatterwalk_copychunks(buf, &walk, nbytes, out); scatterwalk_done(&walk, out, 0); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu83100.00%3100.00%
Total83100.00%3100.00%

EXPORT_SYMBOL_GPL(scatterwalk_map_and_copy);
struct scatterlist *scatterwalk_ffwd(struct scatterlist dst[2], struct scatterlist *src, unsigned int len) { for (;;) { if (!len) return src; if (src->length > len) break; len -= src->length; src = sg_next(src); } sg_init_table(dst, 2); sg_set_page(dst, sg_page(src), src->length - len, src->offset + len); scatterwalk_crypto_chain(dst, sg_next(src), 0, 2); return dst; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu106100.00%2100.00%
Total106100.00%2100.00%

EXPORT_SYMBOL_GPL(scatterwalk_ffwd);

Overall Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu29276.04%1083.33%
Andrew Morton8622.40%18.33%
J. Bruce Fields61.56%18.33%
Total384100.00%12100.00%
Directory: crypto
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