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Block patches 

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Merge remote-tracking branch 'mreitz/tags/pull-block-2017-10-06' into queue-block

Block patches

# gpg: Signature made Fri Oct  6 16:30:57 2017 CEST
# gpg:                using RSA key F407DB0061D5CF40
# gpg: Good signature from "Max Reitz <mreitz@redhat.com>"
# Primary key fingerprint: 91BE B60A 30DB 3E88 57D1  1829 F407 DB00 61D5 CF40

* mreitz/tags/pull-block-2017-10-06:
  block/mirror: check backing in bdrv_mirror_top_flush
  qcow2: truncate the tail of the image file after shrinking the image
  qcow2: fix return error code in qcow2_truncate()
  iotests: Fix 195 if IMGFMT is part of TEST_DIR
  block/mirror: check backing in bdrv_mirror_top_refresh_filename
  block: support passthrough of BDRV_REQ_FUA in crypto driver
  block: convert qcrypto_block_encrypt|decrypt to take bytes offset
  block: convert crypto driver to bdrv_co_preadv|pwritev
  block: fix data type casting for crypto payload offset
  crypto: expose encryption sector size in APIs
  block: use 1 MB bounce buffers for crypto instead of 16KB

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2017-10-06 16:32:08 +02:00
parent 461743390d ce960aa906
commit fc3fd63fc0
13 changed files with 209 additions and 101 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

130
block/crypto.c
View File

@ -279,6 +279,9 @@ static int block_crypto_open_generic(QCryptoBlockFormat format,
return -EINVAL;
}
bs->supported_write_flags = BDRV_REQ_FUA &
bs->file->bs->supported_write_flags;
opts = qemu_opts_create(opts_spec, NULL, 0, &error_abort);
qemu_opts_absorb_qdict(opts, options, &local_err);
if (local_err) {
@ -364,8 +367,9 @@ static int block_crypto_truncate(BlockDriverState *bs, int64_t offset,
PreallocMode prealloc, Error **errp)
{
BlockCrypto *crypto = bs->opaque;
size_t payload_offset =
uint64_t payload_offset =
qcrypto_block_get_payload_offset(crypto->block);
assert(payload_offset < (INT64_MAX - offset));
offset += payload_offset;
@ -379,66 +383,65 @@ static void block_crypto_close(BlockDriverState *bs)
}
#define BLOCK_CRYPTO_MAX_SECTORS 32
/*
* 1 MB bounce buffer gives good performance / memory tradeoff
* when using cache=none|directsync.
*/
#define BLOCK_CRYPTO_MAX_IO_SIZE (1024 * 1024)
static coroutine_fn int
block_crypto_co_readv(BlockDriverState *bs, int64_t sector_num,
int remaining_sectors, QEMUIOVector *qiov)
block_crypto_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
QEMUIOVector *qiov, int flags)
{
BlockCrypto *crypto = bs->opaque;
int cur_nr_sectors; /* number of sectors in current iteration */
uint64_t cur_bytes; /* number of bytes in current iteration */
uint64_t bytes_done = 0;
uint8_t *cipher_data = NULL;
QEMUIOVector hd_qiov;
int ret = 0;
size_t payload_offset =
qcrypto_block_get_payload_offset(crypto->block) / 512;
uint64_t sector_size = qcrypto_block_get_sector_size(crypto->block);
uint64_t payload_offset = qcrypto_block_get_payload_offset(crypto->block);
assert(!flags);
assert(payload_offset < INT64_MAX);
assert(QEMU_IS_ALIGNED(offset, sector_size));
assert(QEMU_IS_ALIGNED(bytes, sector_size));
qemu_iovec_init(&hd_qiov, qiov->niov);
/* Bounce buffer so we have a linear mem region for
* entire sector. XXX optimize so we avoid bounce
* buffer in case that qiov->niov == 1
/* Bounce buffer because we don't wish to expose cipher text
* in qiov which points to guest memory.
*/
cipher_data =
qemu_try_blockalign(bs->file->bs, MIN(BLOCK_CRYPTO_MAX_SECTORS * 512,
qemu_try_blockalign(bs->file->bs, MIN(BLOCK_CRYPTO_MAX_IO_SIZE,
qiov->size));
if (cipher_data == NULL) {
ret = -ENOMEM;
goto cleanup;
}
while (remaining_sectors) {
cur_nr_sectors = remaining_sectors;
if (cur_nr_sectors > BLOCK_CRYPTO_MAX_SECTORS) {
cur_nr_sectors = BLOCK_CRYPTO_MAX_SECTORS;
}
while (bytes) {
cur_bytes = MIN(bytes, BLOCK_CRYPTO_MAX_IO_SIZE);
qemu_iovec_reset(&hd_qiov);
qemu_iovec_add(&hd_qiov, cipher_data, cur_nr_sectors * 512);
qemu_iovec_add(&hd_qiov, cipher_data, cur_bytes);
ret = bdrv_co_readv(bs->file,
payload_offset + sector_num,
cur_nr_sectors, &hd_qiov);
ret = bdrv_co_preadv(bs->file, payload_offset + offset + bytes_done,
cur_bytes, &hd_qiov, 0);
if (ret < 0) {
goto cleanup;
}
if (qcrypto_block_decrypt(crypto->block,
sector_num,
cipher_data, cur_nr_sectors * 512,
NULL) < 0) {
if (qcrypto_block_decrypt(crypto->block, offset + bytes_done,
cipher_data, cur_bytes, NULL) < 0) {
ret = -EIO;
goto cleanup;
}
qemu_iovec_from_buf(qiov, bytes_done,
cipher_data, cur_nr_sectors * 512);
qemu_iovec_from_buf(qiov, bytes_done, cipher_data, cur_bytes);
remaining_sectors -= cur_nr_sectors;
sector_num += cur_nr_sectors;
bytes_done += cur_nr_sectors * 512;
bytes -= cur_bytes;
bytes_done += cur_bytes;
}
cleanup:
@ -450,63 +453,58 @@ block_crypto_co_readv(BlockDriverState *bs, int64_t sector_num,
static coroutine_fn int
block_crypto_co_writev(BlockDriverState *bs, int64_t sector_num,
int remaining_sectors, QEMUIOVector *qiov)
block_crypto_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
QEMUIOVector *qiov, int flags)
{
BlockCrypto *crypto = bs->opaque;
int cur_nr_sectors; /* number of sectors in current iteration */
uint64_t cur_bytes; /* number of bytes in current iteration */
uint64_t bytes_done = 0;
uint8_t *cipher_data = NULL;
QEMUIOVector hd_qiov;
int ret = 0;
size_t payload_offset =
qcrypto_block_get_payload_offset(crypto->block) / 512;
uint64_t sector_size = qcrypto_block_get_sector_size(crypto->block);
uint64_t payload_offset = qcrypto_block_get_payload_offset(crypto->block);
assert(!(flags & ~BDRV_REQ_FUA));
assert(payload_offset < INT64_MAX);
assert(QEMU_IS_ALIGNED(offset, sector_size));
assert(QEMU_IS_ALIGNED(bytes, sector_size));
qemu_iovec_init(&hd_qiov, qiov->niov);
/* Bounce buffer so we have a linear mem region for
* entire sector. XXX optimize so we avoid bounce
* buffer in case that qiov->niov == 1
/* Bounce buffer because we're not permitted to touch
* contents of qiov - it points to guest memory.
*/
cipher_data =
qemu_try_blockalign(bs->file->bs, MIN(BLOCK_CRYPTO_MAX_SECTORS * 512,
qemu_try_blockalign(bs->file->bs, MIN(BLOCK_CRYPTO_MAX_IO_SIZE,
qiov->size));
if (cipher_data == NULL) {
ret = -ENOMEM;
goto cleanup;
}
while (remaining_sectors) {
cur_nr_sectors = remaining_sectors;
while (bytes) {
cur_bytes = MIN(bytes, BLOCK_CRYPTO_MAX_IO_SIZE);
if (cur_nr_sectors > BLOCK_CRYPTO_MAX_SECTORS) {
cur_nr_sectors = BLOCK_CRYPTO_MAX_SECTORS;
}
qemu_iovec_to_buf(qiov, bytes_done, cipher_data, cur_bytes);
qemu_iovec_to_buf(qiov, bytes_done,
cipher_data, cur_nr_sectors * 512);
if (qcrypto_block_encrypt(crypto->block,
sector_num,
cipher_data, cur_nr_sectors * 512,
NULL) < 0) {
if (qcrypto_block_encrypt(crypto->block, offset + bytes_done,
cipher_data, cur_bytes, NULL) < 0) {
ret = -EIO;
goto cleanup;
}
qemu_iovec_reset(&hd_qiov);
qemu_iovec_add(&hd_qiov, cipher_data, cur_nr_sectors * 512);
qemu_iovec_add(&hd_qiov, cipher_data, cur_bytes);
ret = bdrv_co_writev(bs->file,
payload_offset + sector_num,
cur_nr_sectors, &hd_qiov);
ret = bdrv_co_pwritev(bs->file, payload_offset + offset + bytes_done,
cur_bytes, &hd_qiov, flags);
if (ret < 0) {
goto cleanup;
}
remaining_sectors -= cur_nr_sectors;
sector_num += cur_nr_sectors;
bytes_done += cur_nr_sectors * 512;
bytes -= cur_bytes;
bytes_done += cur_bytes;
}
cleanup:
@ -516,13 +514,22 @@ block_crypto_co_writev(BlockDriverState *bs, int64_t sector_num,
return ret;
}
static void block_crypto_refresh_limits(BlockDriverState *bs, Error **errp)
{
BlockCrypto *crypto = bs->opaque;
uint64_t sector_size = qcrypto_block_get_sector_size(crypto->block);
bs->bl.request_alignment = sector_size; /* No sub-sector I/O */
}
static int64_t block_crypto_getlength(BlockDriverState *bs)
{
BlockCrypto *crypto = bs->opaque;
int64_t len = bdrv_getlength(bs->file->bs);
ssize_t offset = qcrypto_block_get_payload_offset(crypto->block);
uint64_t offset = qcrypto_block_get_payload_offset(crypto->block);
assert(offset < INT64_MAX);
assert(offset < len);
len -= offset;
@ -613,8 +620,9 @@ BlockDriver bdrv_crypto_luks = {
.bdrv_truncate = block_crypto_truncate,
.create_opts = &block_crypto_create_opts_luks,
.bdrv_co_readv = block_crypto_co_readv,
.bdrv_co_writev = block_crypto_co_writev,
.bdrv_refresh_limits = block_crypto_refresh_limits,
.bdrv_co_preadv = block_crypto_co_preadv,
.bdrv_co_pwritev = block_crypto_co_pwritev,
.bdrv_getlength = block_crypto_getlength,
.bdrv_get_info = block_crypto_get_info_luks,
.bdrv_get_specific_info = block_crypto_get_specific_info_luks,

9
block/mirror.c
View File

@ -1041,6 +1041,10 @@ static int coroutine_fn bdrv_mirror_top_pwritev(BlockDriverState *bs,
static int coroutine_fn bdrv_mirror_top_flush(BlockDriverState *bs)
{
if (bs->backing == NULL) {
/* we can be here after failed bdrv_append in mirror_start_job */
return 0;
}
return bdrv_co_flush(bs->backing->bs);
}
@ -1058,6 +1062,11 @@ static int coroutine_fn bdrv_mirror_top_pdiscard(BlockDriverState *bs,
static void bdrv_mirror_top_refresh_filename(BlockDriverState *bs, QDict *opts)
{
if (bs->backing == NULL) {
/* we can be here after failed bdrv_attach_child in
* bdrv_set_backing_hd */
return;
}
bdrv_refresh_filename(bs->backing->bs);
pstrcpy(bs->exact_filename, sizeof(bs->exact_filename),
bs->backing->bs->filename);

11
block/qcow.c
View File

@ -478,7 +478,9 @@ static int get_cluster_offset(BlockDriverState *bs,
for(i = 0; i < s->cluster_sectors; i++) {
if (i < n_start || i >= n_end) {
memset(s->cluster_data, 0x00, 512);
if (qcrypto_block_encrypt(s->crypto, start_sect + i,
if (qcrypto_block_encrypt(s->crypto,
(start_sect + i) *
BDRV_SECTOR_SIZE,
s->cluster_data,
BDRV_SECTOR_SIZE,
NULL) < 0) {
@ -668,7 +670,8 @@ static coroutine_fn int qcow_co_readv(BlockDriverState *bs, int64_t sector_num,
}
if (bs->encrypted) {
assert(s->crypto);
if (qcrypto_block_decrypt(s->crypto, sector_num, buf,
if (qcrypto_block_decrypt(s->crypto,
sector_num * BDRV_SECTOR_SIZE, buf,
n * BDRV_SECTOR_SIZE, NULL) < 0) {
ret = -EIO;
break;
@ -740,8 +743,8 @@ static coroutine_fn int qcow_co_writev(BlockDriverState *bs, int64_t sector_num,
}
if (bs->encrypted) {
assert(s->crypto);
if (qcrypto_block_encrypt(s->crypto, sector_num, buf,
n * BDRV_SECTOR_SIZE, NULL) < 0) {
if (qcrypto_block_encrypt(s->crypto, sector_num * BDRV_SECTOR_SIZE,
buf, n * BDRV_SECTOR_SIZE, NULL) < 0) {
ret = -EIO;
break;
}

8
block/qcow2-cluster.c
View File

@ -446,15 +446,13 @@ static bool coroutine_fn do_perform_cow_encrypt(BlockDriverState *bs,
{
if (bytes && bs->encrypted) {
BDRVQcow2State *s = bs->opaque;
int64_t sector = (s->crypt_physical_offset ?
int64_t offset = (s->crypt_physical_offset ?
(cluster_offset + offset_in_cluster) :
(src_cluster_offset + offset_in_cluster))
>> BDRV_SECTOR_BITS;
(src_cluster_offset + offset_in_cluster));
assert((offset_in_cluster & ~BDRV_SECTOR_MASK) == 0);
assert((bytes & ~BDRV_SECTOR_MASK) == 0);
assert(s->crypto);
if (qcrypto_block_encrypt(s->crypto, sector, buffer,
bytes, NULL) < 0) {
if (qcrypto_block_encrypt(s->crypto, offset, buffer, bytes, NULL) < 0) {
return false;
}
}

22
block/qcow2-refcount.c
View File

@ -3181,3 +3181,25 @@ out:
g_free(reftable_tmp);
return ret;
}
int64_t qcow2_get_last_cluster(BlockDriverState *bs, int64_t size)
{
BDRVQcow2State *s = bs->opaque;
int64_t i;
for (i = size_to_clusters(s, size) - 1; i >= 0; i--) {
uint64_t refcount;
int ret = qcow2_get_refcount(bs, i, &refcount);
if (ret < 0) {
fprintf(stderr, "Can't get refcount for cluster %" PRId64 ": %s\n",
i, strerror(-ret));
return ret;
}
if (refcount > 0) {
return i;
}
}
qcow2_signal_corruption(bs, true, -1, -1,
"There are no references in the refcount table.");
return -EIO;
}

31
block/qcow2.c
View File

@ -1811,7 +1811,7 @@ static coroutine_fn int qcow2_co_preadv(BlockDriverState *bs, uint64_t offset,
if (qcrypto_block_decrypt(s->crypto,
(s->crypt_physical_offset ?
cluster_offset + offset_in_cluster :
offset) >> BDRV_SECTOR_BITS,
offset),
cluster_data,
cur_bytes,
NULL) < 0) {
@ -1946,7 +1946,7 @@ static coroutine_fn int qcow2_co_pwritev(BlockDriverState *bs, uint64_t offset,
if (qcrypto_block_encrypt(s->crypto,
(s->crypt_physical_offset ?
cluster_offset + offset_in_cluster :
offset) >> BDRV_SECTOR_BITS,
offset),
cluster_data,
cur_bytes, NULL) < 0) {
ret = -EIO;
@ -3107,6 +3107,7 @@ static int qcow2_truncate(BlockDriverState *bs, int64_t offset,
new_l1_size = size_to_l1(s, offset);
if (offset < old_length) {
int64_t last_cluster, old_file_size;
if (prealloc != PREALLOC_MODE_OFF) {
error_setg(errp,
"Preallocation can't be used for shrinking an image");
@ -3135,6 +3136,28 @@ static int qcow2_truncate(BlockDriverState *bs, int64_t offset,
"Failed to discard unused refblocks");
return ret;
}
old_file_size = bdrv_getlength(bs->file->bs);
if (old_file_size < 0) {
error_setg_errno(errp, -old_file_size,
"Failed to inquire current file length");
return old_file_size;
}
last_cluster = qcow2_get_last_cluster(bs, old_file_size);
if (last_cluster < 0) {
error_setg_errno(errp, -last_cluster,
"Failed to find the last cluster");
return last_cluster;
}
if ((last_cluster + 1) * s->cluster_size < old_file_size) {
ret = bdrv_truncate(bs->file, (last_cluster + 1) * s->cluster_size,
PREALLOC_MODE_OFF, NULL);
if (ret < 0) {
warn_report("Failed to truncate the tail of the image: %s",
strerror(-ret));
ret = 0;
}
}
} else {
ret = qcow2_grow_l1_table(bs, new_l1_size, true);
if (ret < 0) {
@ -3167,7 +3190,7 @@ static int qcow2_truncate(BlockDriverState *bs, int64_t offset,
if (old_file_size < 0) {
error_setg_errno(errp, -old_file_size,
"Failed to inquire current file length");
return ret;
return old_file_size;
}
nb_new_data_clusters = DIV_ROUND_UP(offset - old_length,
@ -3196,7 +3219,7 @@ static int qcow2_truncate(BlockDriverState *bs, int64_t offset,
if (allocation_start < 0) {
error_setg_errno(errp, -allocation_start,
"Failed to resize refcount structures");
return -allocation_start;
return allocation_start;
}
clusters_allocated = qcow2_alloc_clusters_at(bs, allocation_start,

1
block/qcow2.h
View File

@ -597,6 +597,7 @@ int qcow2_change_refcount_order(BlockDriverState *bs, int refcount_order,
BlockDriverAmendStatusCB *status_cb,
void *cb_opaque, Error **errp);
int qcow2_shrink_reftable(BlockDriverState *bs);
int64_t qcow2_get_last_cluster(BlockDriverState *bs, int64_t size);
/* qcow2-cluster.c functions */
int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t min_size,

18
crypto/block-luks.c
View File

@ -846,8 +846,9 @@ qcrypto_block_luks_open(QCryptoBlock *block,
}
}
block->sector_size = QCRYPTO_BLOCK_LUKS_SECTOR_SIZE;
block->payload_offset = luks->header.payload_offset *
QCRYPTO_BLOCK_LUKS_SECTOR_SIZE;
block->sector_size;
luks->cipher_alg = cipheralg;
luks->cipher_mode = ciphermode;
@ -1240,8 +1241,9 @@ qcrypto_block_luks_create(QCryptoBlock *block,
QCRYPTO_BLOCK_LUKS_SECTOR_SIZE)) *
QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS);
block->sector_size = QCRYPTO_BLOCK_LUKS_SECTOR_SIZE;
block->payload_offset = luks->header.payload_offset *
QCRYPTO_BLOCK_LUKS_SECTOR_SIZE;
block->sector_size;
/* Reserve header space to match payload offset */
initfunc(block, block->payload_offset, opaque, &local_err);
@ -1397,29 +1399,33 @@ static void qcrypto_block_luks_cleanup(QCryptoBlock *block)
static int
qcrypto_block_luks_decrypt(QCryptoBlock *block,
uint64_t startsector,
uint64_t offset,
uint8_t *buf,
size_t len,
Error **errp)
{
assert(QEMU_IS_ALIGNED(offset, QCRYPTO_BLOCK_LUKS_SECTOR_SIZE));
assert(QEMU_IS_ALIGNED(len, QCRYPTO_BLOCK_LUKS_SECTOR_SIZE));
return qcrypto_block_decrypt_helper(block->cipher,
block->niv, block->ivgen,
QCRYPTO_BLOCK_LUKS_SECTOR_SIZE,
startsector, buf, len, errp);
offset, buf, len, errp);
}
static int
qcrypto_block_luks_encrypt(QCryptoBlock *block,
uint64_t startsector,
uint64_t offset,
uint8_t *buf,
size_t len,
Error **errp)
{
assert(QEMU_IS_ALIGNED(offset, QCRYPTO_BLOCK_LUKS_SECTOR_SIZE));
assert(QEMU_IS_ALIGNED(len, QCRYPTO_BLOCK_LUKS_SECTOR_SIZE));
return qcrypto_block_encrypt_helper(block->cipher,
block->niv, block->ivgen,
QCRYPTO_BLOCK_LUKS_SECTOR_SIZE,
startsector, buf, len, errp);
offset, buf, len, errp);
}

13
crypto/block-qcow.c
View File

@ -80,6 +80,7 @@ qcrypto_block_qcow_init(QCryptoBlock *block,
goto fail;
}
block->sector_size = QCRYPTO_BLOCK_QCOW_SECTOR_SIZE;
block->payload_offset = 0;
return 0;
@ -142,29 +143,33 @@ qcrypto_block_qcow_cleanup(QCryptoBlock *block)
static int
qcrypto_block_qcow_decrypt(QCryptoBlock *block,
uint64_t startsector,
uint64_t offset,
uint8_t *buf,
size_t len,
Error **errp)
{
assert(QEMU_IS_ALIGNED(offset, QCRYPTO_BLOCK_QCOW_SECTOR_SIZE));
assert(QEMU_IS_ALIGNED(len, QCRYPTO_BLOCK_QCOW_SECTOR_SIZE));
return qcrypto_block_decrypt_helper(block->cipher,
block->niv, block->ivgen,
QCRYPTO_BLOCK_QCOW_SECTOR_SIZE,
startsector, buf, len, errp);
offset, buf, len, errp);
}
static int
qcrypto_block_qcow_encrypt(QCryptoBlock *block,
uint64_t startsector,
uint64_t offset,
uint8_t *buf,
size_t len,
Error **errp)
{
assert(QEMU_IS_ALIGNED(offset, QCRYPTO_BLOCK_QCOW_SECTOR_SIZE));
assert(QEMU_IS_ALIGNED(len, QCRYPTO_BLOCK_QCOW_SECTOR_SIZE));
return qcrypto_block_encrypt_helper(block->cipher,
block->niv, block->ivgen,
QCRYPTO_BLOCK_QCOW_SECTOR_SIZE,
startsector, buf, len, errp);
offset, buf, len, errp);
}

26
crypto/block.c
View File

@ -127,22 +127,22 @@ QCryptoBlockInfo *qcrypto_block_get_info(QCryptoBlock *block,
int qcrypto_block_decrypt(QCryptoBlock *block,
uint64_t startsector,
uint64_t offset,
uint8_t *buf,
size_t len,
Error **errp)
{
return block->driver->decrypt(block, startsector, buf, len, errp);
return block->driver->decrypt(block, offset, buf, len, errp);
}
int qcrypto_block_encrypt(QCryptoBlock *block,
uint64_t startsector,
uint64_t offset,
uint8_t *buf,
size_t len,
Error **errp)
{
return block->driver->encrypt(block, startsector, buf, len, errp);
return block->driver->encrypt(block, offset, buf, len, errp);
}
@ -170,6 +170,12 @@ uint64_t qcrypto_block_get_payload_offset(QCryptoBlock *block)
}
uint64_t qcrypto_block_get_sector_size(QCryptoBlock *block)
{
return block->sector_size;
}
void qcrypto_block_free(QCryptoBlock *block)
{
if (!block) {
@ -188,13 +194,17 @@ int qcrypto_block_decrypt_helper(QCryptoCipher *cipher,
size_t niv,
QCryptoIVGen *ivgen,
int sectorsize,
uint64_t startsector,
uint64_t offset,
uint8_t *buf,
size_t len,
Error **errp)
{
uint8_t *iv;
int ret = -1;
uint64_t startsector = offset / sectorsize;
assert(QEMU_IS_ALIGNED(offset, sectorsize));
assert(QEMU_IS_ALIGNED(len, sectorsize));
iv = niv ? g_new0(uint8_t, niv) : NULL;
@ -237,13 +247,17 @@ int qcrypto_block_encrypt_helper(QCryptoCipher *cipher,
size_t niv,
QCryptoIVGen *ivgen,
int sectorsize,
uint64_t startsector,
uint64_t offset,
uint8_t *buf,
size_t len,
Error **errp)
{
uint8_t *iv;
int ret = -1;
uint64_t startsector = offset / sectorsize;
assert(QEMU_IS_ALIGNED(offset, sectorsize));
assert(QEMU_IS_ALIGNED(len, sectorsize));
iv = niv ? g_new0(uint8_t, niv) : NULL;

5
crypto/blockpriv.h
View File

@ -36,6 +36,7 @@ struct QCryptoBlock {
QCryptoHashAlgorithm kdfhash;
size_t niv;
uint64_t payload_offset; /* In bytes */
uint64_t sector_size; /* In bytes */
};
struct QCryptoBlockDriver {
@ -81,7 +82,7 @@ int qcrypto_block_decrypt_helper(QCryptoCipher *cipher,
size_t niv,
QCryptoIVGen *ivgen,
int sectorsize,
uint64_t startsector,
uint64_t offset,
uint8_t *buf,
size_t len,
Error **errp);
@ -90,7 +91,7 @@ int qcrypto_block_encrypt_helper(QCryptoCipher *cipher,
size_t niv,
QCryptoIVGen *ivgen,
int sectorsize,
uint64_t startsector,
uint64_t offset,
uint8_t *buf,
size_t len,
Error **errp);

29
include/crypto/block.h
View File

@ -161,18 +161,19 @@ QCryptoBlockInfo *qcrypto_block_get_info(QCryptoBlock *block,
/**
* @qcrypto_block_decrypt:
* @block: the block encryption object
* @startsector: the sector from which @buf was read
* @offset: the position at which @iov was read
* @buf: the buffer to decrypt
* @len: the length of @buf in bytes
* @errp: pointer to a NULL-initialized error object
*
* Decrypt @len bytes of cipher text in @buf, writing
* plain text back into @buf
* plain text back into @buf. @len and @offset must be
* a multiple of the encryption format sector size.
*
* Returns 0 on success, -1 on failure
*/
int qcrypto_block_decrypt(QCryptoBlock *block,
uint64_t startsector,
uint64_t offset,
uint8_t *buf,
size_t len,
Error **errp);
@ -180,18 +181,19 @@ int qcrypto_block_decrypt(QCryptoBlock *block,
/**
* @qcrypto_block_encrypt:
* @block: the block encryption object
* @startsector: the sector to which @buf will be written
* @offset: the position at which @iov will be written
* @buf: the buffer to decrypt
* @len: the length of @buf in bytes
* @errp: pointer to a NULL-initialized error object
*
* Encrypt @len bytes of plain text in @buf, writing
* cipher text back into @buf
* cipher text back into @buf. @len and @offset must be
* a multiple of the encryption format sector size.
*
* Returns 0 on success, -1 on failure
*/
int qcrypto_block_encrypt(QCryptoBlock *block,
uint64_t startsector,
uint64_t offset,
uint8_t *buf,
size_t len,
Error **errp);
@ -240,6 +242,21 @@ QCryptoHashAlgorithm qcrypto_block_get_kdf_hash(QCryptoBlock *block);
*/
uint64_t qcrypto_block_get_payload_offset(QCryptoBlock *block);
/**
* qcrypto_block_get_sector_size:
* @block: the block encryption object
*
* Get the size of sectors used for payload encryption. A new
* IV is used at the start of each sector. The encryption
* sector size is not required to match the sector size of the
* underlying storage. For example LUKS will always use a 512
* byte sector size, even if the volume is on a disk with 4k
* sectors.
*
* Returns: the sector in bytes
*/
uint64_t qcrypto_block_get_sector_size(QCryptoBlock *block);
/**
* qcrypto_block_free:
* @block: the block encryption object

7
tests/qemu-iotests/195
View File

@ -44,15 +44,16 @@ _supported_os Linux
function do_run_qemu()
{
echo Testing: "$@" | _filter_imgfmt
echo Testing: "$@"
$QEMU -nographic -qmp-pretty stdio -serial none "$@"
echo
}
function run_qemu()
{
do_run_qemu "$@" 2>&1 | _filter_testdir | _filter_qemu | _filter_qmp \
| _filter_qemu_io | _filter_generated_node_ids
do_run_qemu "$@" 2>&1 | _filter_testdir | _filter_imgfmt | _filter_qemu \
| _filter_qmp | _filter_qemu_io \
| _filter_generated_node_ids
}
size=64M