diff options
Diffstat (limited to 'fs/zfs/zfs_fletcher.c')
| -rw-r--r-- | fs/zfs/zfs_fletcher.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/fs/zfs/zfs_fletcher.c b/fs/zfs/zfs_fletcher.c new file mode 100644 index 0000000000..08f708ca96 --- /dev/null +++ b/fs/zfs/zfs_fletcher.c @@ -0,0 +1,87 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. + * + * 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., 675 Mass Ave, Cambridge, MA 02139, USA. + */ +/* + * Copyright 2007 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#include <common.h> +#include <malloc.h> +#include <linux/stat.h> +#include <linux/time.h> +#include <linux/ctype.h> +#include <asm/byteorder.h> +#include "zfs_common.h" + +#include <zfs/zfs.h> +#include <zfs/zio.h> +#include <zfs/dnode.h> +#include <zfs/uberblock_impl.h> +#include <zfs/vdev_impl.h> +#include <zfs/zio_checksum.h> +#include <zfs/zap_impl.h> +#include <zfs/zap_leaf.h> +#include <zfs/zfs_znode.h> +#include <zfs/dmu.h> +#include <zfs/dmu_objset.h> +#include <zfs/dsl_dir.h> +#include <zfs/dsl_dataset.h> + +void +fletcher_2_endian(const void *buf, uint64_t size, + zfs_endian_t endian, + zio_cksum_t *zcp) +{ + const uint64_t *ip = buf; + const uint64_t *ipend = ip + (size / sizeof(uint64_t)); + uint64_t a0, b0, a1, b1; + + for (a0 = b0 = a1 = b1 = 0; ip < ipend; ip += 2) { + a0 += zfs_to_cpu64(ip[0], endian); + a1 += zfs_to_cpu64(ip[1], endian); + b0 += a0; + b1 += a1; + } + + zcp->zc_word[0] = cpu_to_zfs64(a0, endian); + zcp->zc_word[1] = cpu_to_zfs64(a1, endian); + zcp->zc_word[2] = cpu_to_zfs64(b0, endian); + zcp->zc_word[3] = cpu_to_zfs64(b1, endian); +} + +void +fletcher_4_endian(const void *buf, uint64_t size, zfs_endian_t endian, + zio_cksum_t *zcp) +{ + const uint32_t *ip = buf; + const uint32_t *ipend = ip + (size / sizeof(uint32_t)); + uint64_t a, b, c, d; + + for (a = b = c = d = 0; ip < ipend; ip++) { + a += zfs_to_cpu32(ip[0], endian); + b += a; + c += b; + d += c; + } + + zcp->zc_word[0] = cpu_to_zfs64(a, endian); + zcp->zc_word[1] = cpu_to_zfs64(b, endian); + zcp->zc_word[2] = cpu_to_zfs64(c, endian); + zcp->zc_word[3] = cpu_to_zfs64(d, endian); +} |
