snapraid/raid/memory.c

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C
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2019-01-07 14:06:15 +01:00
/*
* Copyright (C) 2013 Andrea Mazzoleni
*
* 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.
*/
#include "internal.h"
#include "memory.h"
void *raid_malloc_align(size_t size, size_t align_size, void **freeptr)
{
unsigned char *ptr;
uintptr_t offset;
ptr = malloc(size + align_size);
if (!ptr) {
/* LCOV_EXCL_START */
return 0;
/* LCOV_EXCL_STOP */
}
*freeptr = ptr;
offset = ((uintptr_t)ptr) % align_size;
if (offset != 0)
ptr += align_size - offset;
return ptr;
}
void *raid_malloc(size_t size, void **freeptr)
{
return raid_malloc_align(size, RAID_MALLOC_ALIGN, freeptr);
}
void **raid_malloc_vector_align(int nd, int n, size_t size, size_t align_size, size_t displacement_size, void **freeptr)
{
void **v;
unsigned char *va;
int i;
BUG_ON(n <= 0 || nd < 0);
v = malloc(n * sizeof(void *));
if (!v) {
/* LCOV_EXCL_START */
return 0;
/* LCOV_EXCL_STOP */
}
va = raid_malloc_align(n * (size + displacement_size), align_size, freeptr);
if (!va) {
/* LCOV_EXCL_START */
free(v);
return 0;
/* LCOV_EXCL_STOP */
}
for (i = 0; i < n; ++i) {
v[i] = va;
va += size + displacement_size;
}
/* reverse order of the data blocks */
/* because they are usually accessed from the last one */
for (i = 0; i < nd / 2; ++i) {
void *ptr = v[i];
v[i] = v[nd - 1 - i];
v[nd - 1 - i] = ptr;
}
return v;
}
void **raid_malloc_vector(int nd, int n, size_t size, void **freeptr)
{
return raid_malloc_vector_align(nd, n, size, RAID_MALLOC_ALIGN, RAID_MALLOC_DISPLACEMENT, freeptr);
}
void raid_mrand_vector(unsigned seed, int n, size_t size, void **vv)
{
unsigned char **v = (unsigned char **)vv;
int i;
size_t j;
for (i = 0; i < n; ++i)
for (j = 0; j < size; ++j) {
/* basic C99/C11 linear congruential generator */
seed = seed * 1103515245U + 12345U;
v[i][j] = seed >> 16;
}
}
int raid_mtest_vector(int n, size_t size, void **vv)
{
unsigned char **v = (unsigned char **)vv;
int i;
size_t j;
unsigned k;
unsigned char d;
unsigned char p;
/* fill with 0 */
d = 0;
for (i = 0; i < n; ++i)
for (j = 0; j < size; ++j)
v[i][j] = d;
/* test with all the byte patterns */
for (k = 1; k < 256; ++k) {
p = d;
d = k;
/* forward fill */
for (i = 0; i < n; ++i) {
for (j = 0; j < size; ++j) {
if (v[i][j] != p) {
/* LCOV_EXCL_START */
return -1;
/* LCOV_EXCL_STOP */
}
v[i][j] = d;
}
}
p = d;
d = ~p;
/* backward fill with complement */
for (i = 0; i < n; ++i) {
for (j = size; j > 0; --j) {
if (v[i][j - 1] != p) {
/* LCOV_EXCL_START */
return -1;
/* LCOV_EXCL_STOP */
}
v[i][j - 1] = d;
}
}
}
return 0;
}