/*
* Generate the checksum.
*/
void
zio_checksum_compute(zio_t *zio, enum zio_checksum checksum,
abd_t *abd, 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;
spa_t *spa = zio->io_spa;
ASSERT((uint_t)checksum < ZIO_CHECKSUM_FUNCTIONS);
ASSERT(ci->ci_func[0] != NULL);
zio_checksum_template_init(checksum, spa);
if (ci->ci_flags & ZCHECKSUM_FLAG_EMBEDDED) {
zio_eck_t *eck;
void *data = abd_to_buf(abd);
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](abd, size, spa->spa_cksum_tmpls[checksum],
&cksum);
eck->zec_cksum = cksum;
} else {
ci->ci_func[0](abd, size, spa->spa_cksum_tmpls[checksum],
&bp->blk_cksum);
}
}
/*
* 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 (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 (ECKSUM);
if (nused > size)
return (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 (ECKSUM);
}
if (zio_injection_enabled && !zio->io_error &&
(error = zio_handle_fault_injection(zio, ECKSUM)) != 0) {
info->zbc_injected = 1;
return (error);
}
return (0);
}
int
zio_checksum_error_impl(spa_t *spa, const blkptr_t *bp,
enum zio_checksum checksum, abd_t *abd, uint64_t size, uint64_t offset,
zio_bad_cksum_t *info)
{
zio_checksum_info_t *ci = &zio_checksum_table[checksum];
zio_cksum_t actual_cksum, expected_cksum;
zio_eck_t eck;
int byteswap;
if (checksum >= ZIO_CHECKSUM_FUNCTIONS || ci->ci_func[0] == NULL)
return (SET_ERROR(EINVAL));
zio_checksum_template_init(checksum, spa);
if (ci->ci_flags & ZCHECKSUM_FLAG_EMBEDDED) {
zio_cksum_t verifier;
size_t eck_offset;
if (checksum == ZIO_CHECKSUM_ZILOG2) {
zil_chain_t zilc;
uint64_t nused;
abd_copy_to_buf(&zilc, abd, sizeof (zil_chain_t));
eck = zilc.zc_eck;
eck_offset = offsetof(zil_chain_t, zc_eck) +
offsetof(zio_eck_t, zec_cksum);
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_offset = size - sizeof (zio_eck_t);
abd_copy_to_buf_off(&eck, abd, eck_offset,
sizeof (zio_eck_t));
eck_offset += offsetof(zio_eck_t, zec_cksum);
}
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;
abd_copy_from_buf_off(abd, &verifier, eck_offset,
sizeof (zio_cksum_t));
ci->ci_func[byteswap](abd, size,
spa->spa_cksum_tmpls[checksum], &actual_cksum);
abd_copy_from_buf_off(abd, &expected_cksum, eck_offset,
sizeof (zio_cksum_t));
if (byteswap) {
byteswap_uint64_array(&expected_cksum,
sizeof (zio_cksum_t));
}
} else {
byteswap = BP_SHOULD_BYTESWAP(bp);
expected_cksum = bp->blk_cksum;
ci->ci_func[byteswap](abd, size,
spa->spa_cksum_tmpls[checksum], &actual_cksum);
}
/*
* MAC checksums are a special case since half of this checksum will
* actually be the encryption MAC. This will be verified by the
* decryption process, so we just check the truncated checksum now.
* Objset blocks use embedded MACs so we don't truncate the checksum
* for them.
*/
if (bp != NULL && BP_USES_CRYPT(bp) &&
BP_GET_TYPE(bp) != DMU_OT_OBJSET) {
if (!(ci->ci_flags & ZCHECKSUM_FLAG_DEDUP)) {
actual_cksum.zc_word[0] ^= actual_cksum.zc_word[2];
actual_cksum.zc_word[1] ^= actual_cksum.zc_word[3];
}
actual_cksum.zc_word[2] = 0;
actual_cksum.zc_word[3] = 0;
expected_cksum.zc_word[2] = 0;
expected_cksum.zc_word[3] = 0;
}
if (info != NULL) {
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));
return (0);
}
/*
* Generate the checksum.
*/
void
zio_checksum_compute(zio_t *zio, enum zio_checksum checksum,
abd_t *abd, uint64_t size)
{
static const uint64_t zec_magic = ZEC_MAGIC;
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, saved;
spa_t *spa = zio->io_spa;
boolean_t insecure = (ci->ci_flags & ZCHECKSUM_FLAG_DEDUP) == 0;
ASSERT((uint_t)checksum < ZIO_CHECKSUM_FUNCTIONS);
ASSERT(ci->ci_func[0] != NULL);
zio_checksum_template_init(checksum, spa);
if (ci->ci_flags & ZCHECKSUM_FLAG_EMBEDDED) {
zio_eck_t eck;
size_t eck_offset;
bzero(&saved, sizeof (zio_cksum_t));
if (checksum == ZIO_CHECKSUM_ZILOG2) {
zil_chain_t zilc;
abd_copy_to_buf(&zilc, abd, sizeof (zil_chain_t));
size = P2ROUNDUP_TYPED(zilc.zc_nused, ZIL_MIN_BLKSZ,
uint64_t);
eck = zilc.zc_eck;
eck_offset = offsetof(zil_chain_t, zc_eck);
} else {
eck_offset = size - sizeof (zio_eck_t);
abd_copy_to_buf_off(&eck, abd, eck_offset,
sizeof (zio_eck_t));
}
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 {
saved = eck.zec_cksum;
eck.zec_cksum = bp->blk_cksum;
}
abd_copy_from_buf_off(abd, &zec_magic,
eck_offset + offsetof(zio_eck_t, zec_magic),
sizeof (zec_magic));
abd_copy_from_buf_off(abd, &eck.zec_cksum,
eck_offset + offsetof(zio_eck_t, zec_cksum),
sizeof (zio_cksum_t));
ci->ci_func[0](abd, size, spa->spa_cksum_tmpls[checksum],
&cksum);
if (bp != NULL && BP_USES_CRYPT(bp) &&
BP_GET_TYPE(bp) != DMU_OT_OBJSET)
zio_checksum_handle_crypt(&cksum, &saved, insecure);
abd_copy_from_buf_off(abd, &cksum,
eck_offset + offsetof(zio_eck_t, zec_cksum),
sizeof (zio_cksum_t));
} else {
saved = bp->blk_cksum;
ci->ci_func[0](abd, size, spa->spa_cksum_tmpls[checksum],
&cksum);
if (BP_USES_CRYPT(bp) && BP_GET_TYPE(bp) != DMU_OT_OBJSET)
zio_checksum_handle_crypt(&cksum, &saved, insecure);
bp->blk_cksum = cksum;
}
}
int
zio_checksum_error_impl(spa_t *spa, blkptr_t *bp, enum zio_checksum checksum,
abd_t *abd, uint64_t size, uint64_t offset, zio_bad_cksum_t *info)
{
zio_checksum_info_t *ci = &zio_checksum_table[checksum];
int byteswap;
zio_cksum_t actual_cksum, expected_cksum;
if (checksum >= ZIO_CHECKSUM_FUNCTIONS || ci->ci_func[0] == NULL)
return (SET_ERROR(EINVAL));
zio_checksum_template_init(checksum, spa);
if (ci->ci_flags & ZCHECKSUM_FLAG_EMBEDDED) {
zio_eck_t *eck;
zio_cksum_t verifier;
size_t eck_offset;
uint64_t data_size = size;
void *data = abd_borrow_buf_copy(abd, data_size);
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 {
abd_return_buf(abd, data, data_size);
return (SET_ERROR(ECKSUM));
}
if (nused > data_size) {
abd_return_buf(abd, data, data_size);
return (SET_ERROR(ECKSUM));
}
size = P2ROUNDUP_TYPED(nused, ZIL_MIN_BLKSZ, uint64_t);
} else {
eck = (zio_eck_t *)((char *)data + 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));
eck_offset = (size_t)(&eck->zec_cksum) - (size_t)data;
expected_cksum = eck->zec_cksum;
eck->zec_cksum = verifier;
abd_return_buf_copy(abd, data, data_size);
ci->ci_func[byteswap](abd, size,
spa->spa_cksum_tmpls[checksum], &actual_cksum);
abd_copy_from_buf_off(abd, &expected_cksum,
eck_offset, sizeof (zio_cksum_t));
if (byteswap) {
byteswap_uint64_array(&expected_cksum,
sizeof (zio_cksum_t));
}
} else {
byteswap = BP_SHOULD_BYTESWAP(bp);
expected_cksum = bp->blk_cksum;
ci->ci_func[byteswap](abd, size,
spa->spa_cksum_tmpls[checksum], &actual_cksum);
}
if (info != NULL) {
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));
return (0);
}
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;
/*
* Special case for truncated checksums with crypto MAC
* This may not be the best place to deal with this but it is here now.
*
* Words 0 and 1 and 32 bits of word 2 of the checksum are the
* first 160 bytes of SHA256 hash.
* The rest of words 2 and all of word 3 are the crypto MAC so
* ignore those because we can't check them until we do the decryption
* later, nor could we do them if the key wasn't present
*/
if (ci->ci_trunc) {
if (!(0 == (
(actual_cksum.zc_word[0] - expected_cksum.zc_word[0]) |
(actual_cksum.zc_word[1] - expected_cksum.zc_word[1]) |
(BF64_GET(actual_cksum.zc_word[2], 0, 32) -
BF64_GET(expected_cksum.zc_word[2], 0, 32))))) {
return (ECKSUM);
}
} else 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);
}
