[mirror_zfs.git] / module / zfs / zio_checksum.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2013 by Delphix. All rights reserved.
 */

#include <sys/zfs_context.h>
#include <sys/spa.h>
#include <sys/zio.h>
#include <sys/zio_checksum.h>
#include <sys/zil.h>
#include <zfs_fletcher.h>

/*
 * Checksum vectors.
 *
 * In the SPA, everything is checksummed.  We support checksum vectors
 * for three distinct reasons:
 *
 *   1. Different kinds of data need different levels of protection.
 *	For SPA metadata, we always want a very strong checksum.
 *	For user data, we let users make the trade-off between speed
 *	and checksum strength.
 *
 *   2. Cryptographic hash and MAC algorithms are an area of active research.
 *	It is likely that in future hash functions will be at least as strong
 *	as current best-of-breed, and may be substantially faster as well.
 *	We want the ability to take advantage of these new hashes as soon as
 *	they become available.
 *
 *   3. If someone develops hardware that can compute a strong hash quickly,
 *	we want the ability to take advantage of that hardware.
 *
 * Of course, we don't want a checksum upgrade to invalidate existing
 * data, so we store the checksum *function* in eight bits of the bp.
 * This gives us room for up to 256 different checksum functions.
 *
 * When writing a block, we always checksum it with the latest-and-greatest
 * checksum function of the appropriate strength.  When reading a block,
 * we compare the expected checksum against the actual checksum, which we
 * compute via the checksum function specified by BP_GET_CHECKSUM(bp).
 */

/*ARGSUSED*/
static void
zio_checksum_off(const void *buf, uint64_t size, zio_cksum_t *zcp)
{
	ZIO_SET_CHECKSUM(zcp, 0, 0, 0, 0);
}

zio_checksum_info_t zio_checksum_table[ZIO_CHECKSUM_FUNCTIONS] = {
	{{NULL,			NULL},			0, 0, 0, "inherit"},
	{{NULL,			NULL},			0, 0, 0, "on"},
	{{zio_checksum_off,	zio_checksum_off},	0, 0, 0, "off"},
	{{zio_checksum_SHA256,	zio_checksum_SHA256},	1, 1, 0, "label"},
	{{zio_checksum_SHA256,	zio_checksum_SHA256},	1, 1, 0, "gang_header"},
	{{fletcher_2_native,	fletcher_2_byteswap},	0, 1, 0, "zilog"},
	{{fletcher_2_native,	fletcher_2_byteswap},	0, 0, 0, "fletcher2"},
	{{fletcher_4_native,	fletcher_4_byteswap},	1, 0, 0, "fletcher4"},
	{{zio_checksum_SHA256,	zio_checksum_SHA256},	1, 0, 1, "sha256"},
	{{fletcher_4_native,	fletcher_4_byteswap},	0, 1, 0, "zilog2"},
};

enum zio_checksum
zio_checksum_select(enum zio_checksum child, enum zio_checksum parent)
{
	ASSERT(child < ZIO_CHECKSUM_FUNCTIONS);
	ASSERT(parent < ZIO_CHECKSUM_FUNCTIONS);
	ASSERT(parent != ZIO_CHECKSUM_INHERIT && parent != ZIO_CHECKSUM_ON);

	if (child == ZIO_CHECKSUM_INHERIT)
		return (parent);

	if (child == ZIO_CHECKSUM_ON)
		return (ZIO_CHECKSUM_ON_VALUE);

	return (child);
}

enum zio_checksum
zio_checksum_dedup_select(spa_t *spa, enum zio_checksum child,
    enum zio_checksum parent)
{
	ASSERT((child & ZIO_CHECKSUM_MASK) < ZIO_CHECKSUM_FUNCTIONS);
	ASSERT((parent & ZIO_CHECKSUM_MASK) < ZIO_CHECKSUM_FUNCTIONS);
	ASSERT(parent != ZIO_CHECKSUM_INHERIT && parent != ZIO_CHECKSUM_ON);

	if (child == ZIO_CHECKSUM_INHERIT)
		return (parent);

	if (child == ZIO_CHECKSUM_ON)
		return (spa_dedup_checksum(spa));

	if (child == (ZIO_CHECKSUM_ON | ZIO_CHECKSUM_VERIFY))
		return (spa_dedup_checksum(spa) | ZIO_CHECKSUM_VERIFY);

	ASSERT(zio_checksum_table[child & ZIO_CHECKSUM_MASK].ci_dedup ||
	    (child & ZIO_CHECKSUM_VERIFY) || child == ZIO_CHECKSUM_OFF);

	return (child);
}

/*
 * Set the external verifier for a gang block based on <vdev, offset, txg>,
 * a tuple which is guaranteed to be unique for the life of the pool.
 */
static void
zio_checksum_gang_verifier(zio_cksum_t *zcp, blkptr_t *bp)
{
	dva_t *dva = BP_IDENTITY(bp);
	uint64_t txg = BP_PHYSICAL_BIRTH(bp);

	ASSERT(BP_IS_GANG(bp));

	ZIO_SET_CHECKSUM(zcp, DVA_GET_VDEV(dva), DVA_GET_OFFSET(dva), txg, 0);
}

/*
 * Set the external verifier for a label block based on its offset.
 * The vdev is implicit, and the txg is unknowable at pool open time --
 * hence the logic in vdev_uberblock_load() to find the most recent copy.
 */
static void
zio_checksum_label_verifier(zio_cksum_t *zcp, uint64_t offset)
{
	ZIO_SET_CHECKSUM(zcp, offset, 0, 0, 0);
}

/*
 * Generate the checksum.
 */
void
zio_checksum_compute(zio_t *zio, enum zio_checksum checksum,
	void *data, uint64_t size)
{
	blkptr_t *bp = zio->io_bp;
	uint64_t offset = zio->io_offset;
	zio_checksum_info_t *ci = &zio_checksum_table[checksum];
	zio_cksum_t cksum;

	ASSERT((uint_t)checksum < ZIO_CHECKSUM_FUNCTIONS);
	ASSERT(ci->ci_func[0] != NULL);

	if (ci->ci_eck) {
		zio_eck_t *eck;

		if (checksum == ZIO_CHECKSUM_ZILOG2) {
			zil_chain_t *zilc = data;

			size = P2ROUNDUP_TYPED(zilc->zc_nused, ZIL_MIN_BLKSZ,
			    uint64_t);
			eck = &zilc->zc_eck;
		} else {
			eck = (zio_eck_t *)((char *)data + size) - 1;
		}
		if (checksum == ZIO_CHECKSUM_GANG_HEADER)
			zio_checksum_gang_verifier(&eck->zec_cksum, bp);
		else if (checksum == ZIO_CHECKSUM_LABEL)
			zio_checksum_label_verifier(&eck->zec_cksum, offset);
		else
			bp->blk_cksum = eck->zec_cksum;
		eck->zec_magic = ZEC_MAGIC;
		ci->ci_func[0](data, size, &cksum);
		eck->zec_cksum = cksum;
	} else {
		ci->ci_func[0](data, size, &bp->blk_cksum);
	}
}

int
zio_checksum_error(zio_t *zio, zio_bad_cksum_t *info)
{
	blkptr_t *bp = zio->io_bp;
	uint_t checksum = (bp == NULL ? zio->io_prop.zp_checksum :
	    (BP_IS_GANG(bp) ? ZIO_CHECKSUM_GANG_HEADER : BP_GET_CHECKSUM(bp)));
	int byteswap;
	int error;
	uint64_t size = (bp == NULL ? zio->io_size :
	    (BP_IS_GANG(bp) ? SPA_GANGBLOCKSIZE : BP_GET_PSIZE(bp)));
	uint64_t offset = zio->io_offset;
	void *data = zio->io_data;
	zio_checksum_info_t *ci = &zio_checksum_table[checksum];
	zio_cksum_t actual_cksum, expected_cksum, verifier;

	if (checksum >= ZIO_CHECKSUM_FUNCTIONS || ci->ci_func[0] == NULL)
		return (SET_ERROR(EINVAL));

	if (ci->ci_eck) {
		zio_eck_t *eck;

		if (checksum == ZIO_CHECKSUM_ZILOG2) {
			zil_chain_t *zilc = data;
			uint64_t nused;

			eck = &zilc->zc_eck;
			if (eck->zec_magic == ZEC_MAGIC)
				nused = zilc->zc_nused;
			else if (eck->zec_magic == BSWAP_64(ZEC_MAGIC))
				nused = BSWAP_64(zilc->zc_nused);
			else
				return (SET_ERROR(ECKSUM));

			if (nused > size)
				return (SET_ERROR(ECKSUM));

			size = P2ROUNDUP_TYPED(nused, ZIL_MIN_BLKSZ, uint64_t);
		} else {
			eck = (zio_eck_t *)((char *)data + size) - 1;
		}

		if (checksum == ZIO_CHECKSUM_GANG_HEADER)
			zio_checksum_gang_verifier(&verifier, bp);
		else if (checksum == ZIO_CHECKSUM_LABEL)
			zio_checksum_label_verifier(&verifier, offset);
		else
			verifier = bp->blk_cksum;

		byteswap = (eck->zec_magic == BSWAP_64(ZEC_MAGIC));

		if (byteswap)
			byteswap_uint64_array(&verifier, sizeof (zio_cksum_t));

		expected_cksum = eck->zec_cksum;
		eck->zec_cksum = verifier;
		ci->ci_func[byteswap](data, size, &actual_cksum);
		eck->zec_cksum = expected_cksum;

		if (byteswap)
			byteswap_uint64_array(&expected_cksum,
			    sizeof (zio_cksum_t));
	} else {
		ASSERT(!BP_IS_GANG(bp));
		byteswap = BP_SHOULD_BYTESWAP(bp);
		expected_cksum = bp->blk_cksum;
		ci->ci_func[byteswap](data, size, &actual_cksum);
	}

	info->zbc_expected = expected_cksum;
	info->zbc_actual = actual_cksum;
	info->zbc_checksum_name = ci->ci_name;
	info->zbc_byteswapped = byteswap;
	info->zbc_injected = 0;
	info->zbc_has_cksum = 1;

	if (!ZIO_CHECKSUM_EQUAL(actual_cksum, expected_cksum))
		return (SET_ERROR(ECKSUM));

	if (zio_injection_enabled && !zio->io_error &&
	    (error = zio_handle_fault_injection(zio, ECKSUM)) != 0) {

		info->zbc_injected = 1;
		return (error);
	}

	return (0);
}
Commit	Line	Data
34dc7c2f BB	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	/*
428870ff	22	* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
2e528b49	23	* Copyright (c) 2013 by Delphix. All rights reserved.
34dc7c2f BB	24	*/
34dc7c2f BB	25
34dc7c2f BB	26	#include <sys/zfs_context.h>
	27	#include <sys/spa.h>
	28	#include <sys/zio.h>
	29	#include <sys/zio_checksum.h>
428870ff BB	30	#include <sys/zil.h>
428870ff BB	31	#include <zfs_fletcher.h>
34dc7c2f BB	32
	33	/*
	34	* Checksum vectors.
	35	*
	36	* In the SPA, everything is checksummed. We support checksum vectors
	37	* for three distinct reasons:
	38	*
	39	* 1. Different kinds of data need different levels of protection.
	40	* For SPA metadata, we always want a very strong checksum.
	41	* For user data, we let users make the trade-off between speed
	42	* and checksum strength.
	43	*
	44	* 2. Cryptographic hash and MAC algorithms are an area of active research.
	45	* It is likely that in future hash functions will be at least as strong
	46	* as current best-of-breed, and may be substantially faster as well.
	47	* We want the ability to take advantage of these new hashes as soon as
	48	* they become available.
	49	*
	50	* 3. If someone develops hardware that can compute a strong hash quickly,
	51	* we want the ability to take advantage of that hardware.
	52	*
	53	* Of course, we don't want a checksum upgrade to invalidate existing
428870ff BB	54	* data, so we store the checksum function in eight bits of the bp.
428870ff BB	55	* This gives us room for up to 256 different checksum functions.
34dc7c2f BB	56	*
	57	* When writing a block, we always checksum it with the latest-and-greatest
	58	* checksum function of the appropriate strength. When reading a block,
	59	* we compare the expected checksum against the actual checksum, which we
428870ff	60	* compute via the checksum function specified by BP_GET_CHECKSUM(bp).
34dc7c2f BB	61	*/
	62
	63	/ARGSUSED/
	64	static void
	65	zio_checksum_off(const void buf, uint64_t size, zio_cksum_t zcp)
	66	{
	67	ZIO_SET_CHECKSUM(zcp, 0, 0, 0, 0);
	68	}
	69
	70	zio_checksum_info_t zio_checksum_table[ZIO_CHECKSUM_FUNCTIONS] = {
428870ff BB	71	{{NULL, NULL}, 0, 0, 0, "inherit"},
	72	{{NULL, NULL}, 0, 0, 0, "on"},
	73	{{zio_checksum_off, zio_checksum_off}, 0, 0, 0, "off"},
	74	{{zio_checksum_SHA256, zio_checksum_SHA256}, 1, 1, 0, "label"},
	75	{{zio_checksum_SHA256, zio_checksum_SHA256}, 1, 1, 0, "gang_header"},
	76	{{fletcher_2_native, fletcher_2_byteswap}, 0, 1, 0, "zilog"},
	77	{{fletcher_2_native, fletcher_2_byteswap}, 0, 0, 0, "fletcher2"},
	78	{{fletcher_4_native, fletcher_4_byteswap}, 1, 0, 0, "fletcher4"},
	79	{{zio_checksum_SHA256, zio_checksum_SHA256}, 1, 0, 1, "sha256"},
	80	{{fletcher_4_native, fletcher_4_byteswap}, 0, 1, 0, "zilog2"},
34dc7c2f BB	81	};
34dc7c2f BB	82
428870ff BB	83	enum zio_checksum
428870ff BB	84	zio_checksum_select(enum zio_checksum child, enum zio_checksum parent)
34dc7c2f BB	85	{
	86	ASSERT(child < ZIO_CHECKSUM_FUNCTIONS);
	87	ASSERT(parent < ZIO_CHECKSUM_FUNCTIONS);
	88	ASSERT(parent != ZIO_CHECKSUM_INHERIT && parent != ZIO_CHECKSUM_ON);
	89
	90	if (child == ZIO_CHECKSUM_INHERIT)
	91	return (parent);
	92
	93	if (child == ZIO_CHECKSUM_ON)
	94	return (ZIO_CHECKSUM_ON_VALUE);
	95
	96	return (child);
	97	}
	98
428870ff BB	99	enum zio_checksum
	100	zio_checksum_dedup_select(spa_t *spa, enum zio_checksum child,
	101	enum zio_checksum parent)
	102	{
	103	ASSERT((child & ZIO_CHECKSUM_MASK) < ZIO_CHECKSUM_FUNCTIONS);
	104	ASSERT((parent & ZIO_CHECKSUM_MASK) < ZIO_CHECKSUM_FUNCTIONS);
	105	ASSERT(parent != ZIO_CHECKSUM_INHERIT && parent != ZIO_CHECKSUM_ON);
	106
	107	if (child == ZIO_CHECKSUM_INHERIT)
	108	return (parent);
	109
	110	if (child == ZIO_CHECKSUM_ON)
	111	return (spa_dedup_checksum(spa));
	112
	113	if (child == (ZIO_CHECKSUM_ON \| ZIO_CHECKSUM_VERIFY))
	114	return (spa_dedup_checksum(spa) \| ZIO_CHECKSUM_VERIFY);
	115
	116	ASSERT(zio_checksum_table[child & ZIO_CHECKSUM_MASK].ci_dedup \|\|
	117	(child & ZIO_CHECKSUM_VERIFY) \|\| child == ZIO_CHECKSUM_OFF);
	118
	119	return (child);
	120	}
	121
b128c09f BB	122	/*
	123	* Set the external verifier for a gang block based on <vdev, offset, txg>,
	124	* a tuple which is guaranteed to be unique for the life of the pool.
	125	*/
	126	static void
	127	zio_checksum_gang_verifier(zio_cksum_t zcp, blkptr_t bp)
	128	{
	129	dva_t *dva = BP_IDENTITY(bp);
428870ff	130	uint64_t txg = BP_PHYSICAL_BIRTH(bp);
b128c09f BB	131
	132	ASSERT(BP_IS_GANG(bp));
	133
	134	ZIO_SET_CHECKSUM(zcp, DVA_GET_VDEV(dva), DVA_GET_OFFSET(dva), txg, 0);
	135	}
	136
	137	/*
	138	* Set the external verifier for a label block based on its offset.
	139	* The vdev is implicit, and the txg is unknowable at pool open time --
	140	* hence the logic in vdev_uberblock_load() to find the most recent copy.
	141	*/
	142	static void
	143	zio_checksum_label_verifier(zio_cksum_t *zcp, uint64_t offset)
	144	{
	145	ZIO_SET_CHECKSUM(zcp, offset, 0, 0, 0);
	146	}
	147
34dc7c2f BB	148	/*
	149	* Generate the checksum.
	150	*/
	151	void
b128c09f BB	152	zio_checksum_compute(zio_t *zio, enum zio_checksum checksum,
b128c09f BB	153	void *data, uint64_t size)
34dc7c2f	154	{
b128c09f BB	155	blkptr_t *bp = zio->io_bp;
b128c09f BB	156	uint64_t offset = zio->io_offset;
34dc7c2f	157	zio_checksum_info_t *ci = &zio_checksum_table[checksum];
428870ff	158	zio_cksum_t cksum;
34dc7c2f	159
b128c09f	160	ASSERT((uint_t)checksum < ZIO_CHECKSUM_FUNCTIONS);
34dc7c2f BB	161	ASSERT(ci->ci_func[0] != NULL);
34dc7c2f BB	162
428870ff BB	163	if (ci->ci_eck) {
	164	zio_eck_t *eck;
	165
	166	if (checksum == ZIO_CHECKSUM_ZILOG2) {
	167	zil_chain_t *zilc = data;
	168
	169	size = P2ROUNDUP_TYPED(zilc->zc_nused, ZIL_MIN_BLKSZ,
	170	uint64_t);
	171	eck = &zilc->zc_eck;
	172	} else {
	173	eck = (zio_eck_t )((char )data + size) - 1;
	174	}
b128c09f	175	if (checksum == ZIO_CHECKSUM_GANG_HEADER)
428870ff	176	zio_checksum_gang_verifier(&eck->zec_cksum, bp);
b128c09f	177	else if (checksum == ZIO_CHECKSUM_LABEL)
428870ff	178	zio_checksum_label_verifier(&eck->zec_cksum, offset);
b128c09f	179	else
428870ff BB	180	bp->blk_cksum = eck->zec_cksum;
	181	eck->zec_magic = ZEC_MAGIC;
	182	ci->ci_func[0](data, size, &cksum);
	183	eck->zec_cksum = cksum;
34dc7c2f	184	} else {
b128c09f	185	ci->ci_func[0](data, size, &bp->blk_cksum);
34dc7c2f BB	186	}
	187	}
	188
	189	int
428870ff	190	zio_checksum_error(zio_t zio, zio_bad_cksum_t info)
34dc7c2f BB	191	{
34dc7c2f BB	192	blkptr_t *bp = zio->io_bp;
b128c09f BB	193	uint_t checksum = (bp == NULL ? zio->io_prop.zp_checksum :
	194	(BP_IS_GANG(bp) ? ZIO_CHECKSUM_GANG_HEADER : BP_GET_CHECKSUM(bp)));
	195	int byteswap;
428870ff	196	int error;
b128c09f BB	197	uint64_t size = (bp == NULL ? zio->io_size :
	198	(BP_IS_GANG(bp) ? SPA_GANGBLOCKSIZE : BP_GET_PSIZE(bp)));
	199	uint64_t offset = zio->io_offset;
428870ff	200	void *data = zio->io_data;
34dc7c2f	201	zio_checksum_info_t *ci = &zio_checksum_table[checksum];
b128c09f	202	zio_cksum_t actual_cksum, expected_cksum, verifier;
34dc7c2f BB	203
34dc7c2f BB	204	if (checksum >= ZIO_CHECKSUM_FUNCTIONS \|\| ci->ci_func[0] == NULL)
2e528b49	205	return (SET_ERROR(EINVAL));
34dc7c2f	206
428870ff BB	207	if (ci->ci_eck) {
	208	zio_eck_t *eck;
	209
	210	if (checksum == ZIO_CHECKSUM_ZILOG2) {
	211	zil_chain_t *zilc = data;
	212	uint64_t nused;
	213
	214	eck = &zilc->zc_eck;
	215	if (eck->zec_magic == ZEC_MAGIC)
	216	nused = zilc->zc_nused;
	217	else if (eck->zec_magic == BSWAP_64(ZEC_MAGIC))
	218	nused = BSWAP_64(zilc->zc_nused);
	219	else
2e528b49	220	return (SET_ERROR(ECKSUM));
428870ff BB	221
428870ff BB	222	if (nused > size)
2e528b49	223	return (SET_ERROR(ECKSUM));
428870ff BB	224
	225	size = P2ROUNDUP_TYPED(nused, ZIL_MIN_BLKSZ, uint64_t);
	226	} else {
	227	eck = (zio_eck_t )((char )data + size) - 1;
	228	}
	229
34dc7c2f	230	if (checksum == ZIO_CHECKSUM_GANG_HEADER)
b128c09f BB	231	zio_checksum_gang_verifier(&verifier, bp);
	232	else if (checksum == ZIO_CHECKSUM_LABEL)
	233	zio_checksum_label_verifier(&verifier, offset);
	234	else
	235	verifier = bp->blk_cksum;
	236
428870ff	237	byteswap = (eck->zec_magic == BSWAP_64(ZEC_MAGIC));
34dc7c2f	238
b128c09f BB	239	if (byteswap)
	240	byteswap_uint64_array(&verifier, sizeof (zio_cksum_t));
	241
428870ff BB	242	expected_cksum = eck->zec_cksum;
428870ff BB	243	eck->zec_cksum = verifier;
b128c09f	244	ci->ci_func[byteswap](data, size, &actual_cksum);
428870ff	245	eck->zec_cksum = expected_cksum;
b128c09f BB	246
b128c09f BB	247	if (byteswap)
34dc7c2f BB	248	byteswap_uint64_array(&expected_cksum,
34dc7c2f BB	249	sizeof (zio_cksum_t));
34dc7c2f BB	250	} else {
34dc7c2f BB	251	ASSERT(!BP_IS_GANG(bp));
b128c09f BB	252	byteswap = BP_SHOULD_BYTESWAP(bp);
b128c09f BB	253	expected_cksum = bp->blk_cksum;
34dc7c2f BB	254	ci->ci_func[byteswap](data, size, &actual_cksum);
	255	}
	256
428870ff BB	257	info->zbc_expected = expected_cksum;
	258	info->zbc_actual = actual_cksum;
	259	info->zbc_checksum_name = ci->ci_name;
	260	info->zbc_byteswapped = byteswap;
	261	info->zbc_injected = 0;
	262	info->zbc_has_cksum = 1;
	263
b128c09f	264	if (!ZIO_CHECKSUM_EQUAL(actual_cksum, expected_cksum))
2e528b49	265	return (SET_ERROR(ECKSUM));
34dc7c2f	266
428870ff BB	267	if (zio_injection_enabled && !zio->io_error &&
	268	(error = zio_handle_fault_injection(zio, ECKSUM)) != 0) {
	269
	270	info->zbc_injected = 1;
	271	return (error);
	272	}
34dc7c2f BB	273
	274	return (0);
	275	}