Instead of requiring separate input/output buffers for
encrypting data, change encrypt_sectors() to assume
use of a single buffer, encrypting in place. One current
caller all uses the same buffer for input/output already
and the other two callers are easily converted todo so.
Signed-off-by: Daniel P. Berrange <berra...@redhat.com>
---
block/qcow.c | 31 ++++++++++---------------------
1 file changed, 10 insertions(+), 21 deletions(-)
diff --git a/block/qcow.c b/block/qcow.c
index 635085e..5a4f310 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -293,12 +293,9 @@ static int qcow_set_key(BlockDriverState *bs, const char
*key)
return 0;
}
-/* The crypt function is compatible with the linux cryptoloop
- algorithm for < 4 GB images. NOTE: out_buf == in_buf is
- supported */
static int encrypt_sectors(BDRVQcowState *s, int64_t sector_num,
- uint8_t *out_buf, const uint8_t *in_buf,
- int nb_sectors, bool enc, Error **errp)
+ uint8_t *buf, int nb_sectors, bool enc,
+ Error **errp)
{
union {
uint64_t ll[2];
@@ -317,14 +314,12 @@ static int encrypt_sectors(BDRVQcowState *s, int64_t
sector_num,
}
if (enc) {
ret = qcrypto_cipher_encrypt(s->cipher,
- in_buf,
- out_buf,
+ buf, buf,
512,
errp);
} else {
ret = qcrypto_cipher_decrypt(s->cipher,
- in_buf,
- out_buf,
+ buf, buf,
512,
errp);
}
@@ -332,8 +327,7 @@ static int encrypt_sectors(BDRVQcowState *s, int64_t
sector_num,
return -1;
}
sector_num++;
- in_buf += 512;
- out_buf += 512;
+ buf += 512;
}
return 0;
}
@@ -453,13 +447,12 @@ static uint64_t get_cluster_offset(BlockDriverState *bs,
uint64_t start_sect;
assert(s->cipher);
start_sect = (offset & ~(s->cluster_size - 1)) >> 9;
- memset(s->cluster_data + 512, 0x00, 512);
+ memset(s->cluster_data, 0x00, 512);
for(i = 0; i < s->cluster_sectors; i++) {
if (i < n_start || i >= n_end) {
Error *err = NULL;
if (encrypt_sectors(s, start_sect + i,
- s->cluster_data,
- s->cluster_data + 512, 1,
+ s->cluster_data, 1,
true, &err) < 0) {
error_free(err);
errno = EIO;
@@ -637,7 +630,7 @@ static coroutine_fn int qcow_co_readv(BlockDriverState *bs,
int64_t sector_num,
}
if (bs->encrypted) {
assert(s->cipher);
- if (encrypt_sectors(s, sector_num, buf, buf,
+ if (encrypt_sectors(s, sector_num, buf,
n, false, &err) < 0) {
goto fail;
}
@@ -672,7 +665,6 @@ static coroutine_fn int qcow_co_writev(BlockDriverState
*bs, int64_t sector_num,
BDRVQcowState *s = bs->opaque;
int index_in_cluster;
uint64_t cluster_offset;
- const uint8_t *src_buf;
int ret = 0, n;
uint8_t *cluster_data = NULL;
struct iovec hd_iov;
@@ -715,18 +707,15 @@ static coroutine_fn int qcow_co_writev(BlockDriverState
*bs, int64_t sector_num,
if (!cluster_data) {
cluster_data = g_malloc0(s->cluster_size);
}
- if (encrypt_sectors(s, sector_num, cluster_data, buf,
+ if (encrypt_sectors(s, sector_num, buf,
n, true, &err) < 0) {
error_free(err);
ret = -EIO;
break;
}
- src_buf = cluster_data;
- } else {
- src_buf = buf;
}
- hd_iov.iov_base = (void *)src_buf;
+ hd_iov.iov_base = (void *)buf;
hd_iov.iov_len = n * 512;
qemu_iovec_init_external(&hd_qiov, &hd_iov, 1);
qemu_co_mutex_unlock(&s->lock);
--
2.5.0
