zio_checksum.h revision 321610 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2014, 2016 by Delphix. All rights reserved.
24 * Copyright Saso Kiselkov 2013, All rights reserved.
25 */
26
27#ifndef _SYS_ZIO_CHECKSUM_H
28#define	_SYS_ZIO_CHECKSUM_H
29
30#include <sys/zio.h>
31#include <zfeature_common.h>
32
33#ifdef	__cplusplus
34extern "C" {
35#endif
36
37struct abd;
38
39/*
40 * Signature for checksum functions.
41 */
42typedef void zio_checksum_t(struct abd *, uint64_t size,
43    const void *ctx_template, zio_cksum_t *zcp);
44typedef void *zio_checksum_tmpl_init_t(const zio_cksum_salt_t *salt);
45typedef void zio_checksum_tmpl_free_t(void *ctx_template);
46
47typedef enum zio_checksum_flags {
48	/* Strong enough for metadata? */
49	ZCHECKSUM_FLAG_METADATA = (1 << 1),
50	/* ZIO embedded checksum */
51	ZCHECKSUM_FLAG_EMBEDDED = (1 << 2),
52	/* Strong enough for dedup (without verification)? */
53	ZCHECKSUM_FLAG_DEDUP = (1 << 3),
54	/* Uses salt value */
55	ZCHECKSUM_FLAG_SALTED = (1 << 4),
56	/* Strong enough for nopwrite? */
57	ZCHECKSUM_FLAG_NOPWRITE = (1 << 5)
58} zio_checksum_flags_t;
59
60/*
61 * Information about each checksum function.
62 */
63typedef struct zio_checksum_info {
64	/* checksum function for each byteorder */
65	zio_checksum_t			*ci_func[2];
66	zio_checksum_tmpl_init_t	*ci_tmpl_init;
67	zio_checksum_tmpl_free_t	*ci_tmpl_free;
68	zio_checksum_flags_t		ci_flags;
69	char				*ci_name;	/* descriptive name */
70} zio_checksum_info_t;
71
72typedef struct zio_bad_cksum {
73	zio_cksum_t		zbc_expected;
74	zio_cksum_t		zbc_actual;
75	const char		*zbc_checksum_name;
76	uint8_t			zbc_byteswapped;
77	uint8_t			zbc_injected;
78	uint8_t			zbc_has_cksum;	/* expected/actual valid */
79} zio_bad_cksum_t;
80
81extern zio_checksum_info_t zio_checksum_table[ZIO_CHECKSUM_FUNCTIONS];
82
83/*
84 * Checksum routines.
85 */
86extern zio_checksum_t abd_checksum_SHA256;
87extern zio_checksum_t abd_checksum_SHA512_native;
88extern zio_checksum_t abd_checksum_SHA512_byteswap;
89
90/* Skein */
91extern zio_checksum_t abd_checksum_skein_native;
92extern zio_checksum_t abd_checksum_skein_byteswap;
93extern zio_checksum_tmpl_init_t abd_checksum_skein_tmpl_init;
94extern zio_checksum_tmpl_free_t abd_checksum_skein_tmpl_free;
95
96#ifdef illumos
97/* Edon-R */
98extern zio_checksum_t abd_checksum_edonr_native;
99extern zio_checksum_t abd_checksum_edonr_byteswap;
100extern zio_checksum_tmpl_init_t abd_checksum_edonr_tmpl_init;
101extern zio_checksum_tmpl_free_t abd_checksum_edonr_tmpl_free;
102#endif
103
104extern int zio_checksum_equal(spa_t *, blkptr_t *, enum zio_checksum,
105    void *, uint64_t, uint64_t, zio_bad_cksum_t *);
106extern void zio_checksum_compute(zio_t *, enum zio_checksum,
107    struct abd *, uint64_t);
108extern int zio_checksum_error_impl(spa_t *, blkptr_t *, enum zio_checksum,
109    struct abd *, uint64_t, uint64_t, zio_bad_cksum_t *);
110extern int zio_checksum_error(zio_t *zio, zio_bad_cksum_t *out);
111extern enum zio_checksum spa_dedup_checksum(spa_t *spa);
112extern void zio_checksum_templates_free(spa_t *spa);
113extern spa_feature_t zio_checksum_to_feature(enum zio_checksum cksum);
114
115#ifdef	__cplusplus
116}
117#endif
118
119#endif	/* _SYS_ZIO_CHECKSUM_H */
120