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Thu, 12 Sep 2019 22:38:01 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v3 1/3] block/qcow2: refactoring of threaded encryption code X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Vladimir Sementsov-Ogievskiy , =?UTF-8?q?Daniel=20P=20=2E=20Berrang=C3=A9?= , qemu-block@nongnu.org, qemu-stable , Max Reitz , Maxim Levitsky Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" This commit tries to clarify few function arguments, and add comments describing the encrypt/decrypt interface Signed-off-by: Maxim Levitsky --- block/qcow2-cluster.c | 8 +++--- block/qcow2-threads.c | 63 ++++++++++++++++++++++++++++++++++--------- 2 files changed, 54 insertions(+), 17 deletions(-) diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index f09cc992af..b95e64c237 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -463,8 +463,8 @@ static int coroutine_fn do_perform_cow_read(BlockDriver= State *bs, } =20 static bool coroutine_fn do_perform_cow_encrypt(BlockDriverState *bs, - uint64_t src_cluster_offse= t, - uint64_t cluster_offset, + uint64_t guest_cluster_off= set, + uint64_t host_cluster_offs= et, unsigned offset_in_cluster, uint8_t *buffer, unsigned bytes) @@ -474,8 +474,8 @@ static bool coroutine_fn do_perform_cow_encrypt(BlockDr= iverState *bs, assert((offset_in_cluster & ~BDRV_SECTOR_MASK) =3D=3D 0); assert((bytes & ~BDRV_SECTOR_MASK) =3D=3D 0); assert(s->crypto); - if (qcow2_co_encrypt(bs, cluster_offset, - src_cluster_offset + offset_in_cluster, + if (qcow2_co_encrypt(bs, host_cluster_offset, + guest_cluster_offset + offset_in_cluster, buffer, bytes) < 0) { return false; } diff --git a/block/qcow2-threads.c b/block/qcow2-threads.c index 3b1e63fe41..6da1838e95 100644 --- a/block/qcow2-threads.c +++ b/block/qcow2-threads.c @@ -234,15 +234,19 @@ static int qcow2_encdec_pool_func(void *opaque) } =20 static int coroutine_fn -qcow2_co_encdec(BlockDriverState *bs, uint64_t file_cluster_offset, - uint64_t offset, void *buf, size_t len, Qcow2EncDecFunc = func) +qcow2_co_encdec(BlockDriverState *bs, uint64_t host_cluster_offset, + uint64_t guest_offset, void *buf, size_t len, + Qcow2EncDecFunc func) { BDRVQcow2State *s =3D bs->opaque; + + uint64_t offset =3D s->crypt_physical_offset ? + host_cluster_offset + offset_into_cluster(s, guest_offset) : + guest_offset; + Qcow2EncDecData arg =3D { .block =3D s->crypto, - .offset =3D s->crypt_physical_offset ? - file_cluster_offset + offset_into_cluster(s, offset)= : - offset, + .offset =3D offset, .buf =3D buf, .len =3D len, .func =3D func, @@ -251,18 +255,51 @@ qcow2_co_encdec(BlockDriverState *bs, uint64_t file_c= luster_offset, return qcow2_co_process(bs, qcow2_encdec_pool_func, &arg); } =20 + +/* + * qcow2_co_encrypt() + * + * Encrypts one or more contiguous aligned sectors + * + * @host_cluster_offset - underlying storage offset of the first cluster + * in which the encrypted data will be written + * Used as an initialization vector for encryption + * + * @guest_offset - guest (virtual) offset of the first sector of the + * data to be encrypted + * Used as an initialization vector for older, qcow2 native encryption + * + * @buf - buffer with the data to encrypt, that after encryption + * will be written to the underlying storage device at + * @host_cluster_offset + * + * @len - length of the buffer (in sector size multiplies) + * + * Note that the group of the sectors, don't have to be aligned + * on cluster boundary and can also cross a cluster boundary. + * + */ int coroutine_fn -qcow2_co_encrypt(BlockDriverState *bs, uint64_t file_cluster_offset, - uint64_t offset, void *buf, size_t len) +qcow2_co_encrypt(BlockDriverState *bs, uint64_t host_cluster_offset, + uint64_t guest_offset, void *buf, size_t len) { - return qcow2_co_encdec(bs, file_cluster_offset, offset, buf, len, - qcrypto_block_encrypt); + return qcow2_co_encdec(bs, host_cluster_offset, guest_offset, buf, len, + qcrypto_block_encrypt); } =20 + +/* + * qcow2_co_decrypt() + * + * Decrypts one or more contiguous aligned sectors + * Similar to qcow2_co_encrypt + * + */ + int coroutine_fn -qcow2_co_decrypt(BlockDriverState *bs, uint64_t file_cluster_offset, - uint64_t offset, void *buf, size_t len) +qcow2_co_decrypt(BlockDriverState *bs, uint64_t host_cluster_offset, + uint64_t guest_offset, void *buf, size_t len) { - return qcow2_co_encdec(bs, file_cluster_offset, offset, buf, len, - qcrypto_block_decrypt); + return qcow2_co_encdec(bs, host_cluster_offset, guest_offset, buf, len, + qcrypto_block_decrypt); } --=20 2.17.2