Re: [Qemu-devel] [PATCH 06/14] crypto: Make errp the last parameter of functions

[Daniel P. Berrange]

On Fri, Apr 21, 2017 at 08:27:02PM +0800, Fam Zheng wrote:
> Move opaque to 2nd instead of the 2nd to last, so that compilers help
> check with the convertion.

Moving 'opaque' like this should not be done.

If you want the compiler to check the fixes, it should be done in
just two stages. First move errp & move opaque to start, compile
it & verify. Then put opaque back to where it was, and compile
again. The resulting commit thus only has the errp move, not the
unrelated & uneccessary opaque move.

> 
> Signed-off-by: Fam Zheng <address@hidden>
> ---
>  block/crypto.c            | 12 ++++++------
>  crypto/block-luks.c       | 21 +++++++++------------
>  include/crypto/block.h    | 12 ++++++------
>  tests/test-crypto-block.c | 12 ++++++------
>  4 files changed, 27 insertions(+), 30 deletions(-)
> 
> diff --git a/block/crypto.c b/block/crypto.c
> index 4a20388..34549b2 100644
> --- a/block/crypto.c
> +++ b/block/crypto.c
> @@ -56,11 +56,11 @@ static int block_crypto_probe_generic(QCryptoBlockFormat 
> format,
>  
>  
>  static ssize_t block_crypto_read_func(QCryptoBlock *block,
> +                                      void *opaque,
>                                        size_t offset,
>                                        uint8_t *buf,
>                                        size_t buflen,
> -                                      Error **errp,
> -                                      void *opaque)
> +                                      Error **errp)
>  {
>      BlockDriverState *bs = opaque;
>      ssize_t ret;
> @@ -83,11 +83,11 @@ struct BlockCryptoCreateData {
>  
>  
>  static ssize_t block_crypto_write_func(QCryptoBlock *block,
> +                                       void *opaque,
>                                         size_t offset,
>                                         const uint8_t *buf,
>                                         size_t buflen,
> -                                       Error **errp,
> -                                       void *opaque)
> +                                       Error **errp)
>  {
>      struct BlockCryptoCreateData *data = opaque;
>      ssize_t ret;
> @@ -102,9 +102,9 @@ static ssize_t block_crypto_write_func(QCryptoBlock 
> *block,
>  
>  
>  static ssize_t block_crypto_init_func(QCryptoBlock *block,
> +                                      void *opaque,
>                                        size_t headerlen,
> -                                      Error **errp,
> -                                      void *opaque)
> +                                      Error **errp)
>  {
>      struct BlockCryptoCreateData *data = opaque;
>      int ret;
> diff --git a/crypto/block-luks.c b/crypto/block-luks.c
> index 4530f82..d5a31bb 100644
> --- a/crypto/block-luks.c
> +++ b/crypto/block-luks.c
> @@ -473,10 +473,10 @@ qcrypto_block_luks_load_key(QCryptoBlock *block,
>       * then encrypted.
>       */
>      rv = readfunc(block,
> +                  opaque,
>                    slot->key_offset * QCRYPTO_BLOCK_LUKS_SECTOR_SIZE,
>                    splitkey, splitkeylen,
> -                  errp,
> -                  opaque);
> +                  errp);
>      if (rv < 0) {
>          goto cleanup;
>      }
> @@ -676,11 +676,10 @@ qcrypto_block_luks_open(QCryptoBlock *block,
>  
>      /* Read the entire LUKS header, minus the key material from
>       * the underlying device */
> -    rv = readfunc(block, 0,
> +    rv = readfunc(block, opaque, 0,
>                    (uint8_t *)&luks->header,
>                    sizeof(luks->header),
> -                  errp,
> -                  opaque);
> +                  errp);
>      if (rv < 0) {
>          ret = rv;
>          goto fail;
> @@ -1246,7 +1245,7 @@ qcrypto_block_luks_create(QCryptoBlock *block,
>          QCRYPTO_BLOCK_LUKS_SECTOR_SIZE;
>  
>      /* Reserve header space to match payload offset */
> -    initfunc(block, block->payload_offset, &local_err, opaque);
> +    initfunc(block, opaque, block->payload_offset, &local_err);
>      if (local_err) {
>          error_propagate(errp, local_err);
>          goto error;
> @@ -1268,11 +1267,10 @@ qcrypto_block_luks_create(QCryptoBlock *block,
>  
>  
>      /* Write out the partition header and key slot headers */
> -    writefunc(block, 0,
> +    writefunc(block, opaque, 0,
>                (const uint8_t *)&luks->header,
>                sizeof(luks->header),
> -              &local_err,
> -              opaque);
> +              &local_err);
>  
>      /* Delay checking local_err until we've byte-swapped */
>  
> @@ -1297,12 +1295,11 @@ qcrypto_block_luks_create(QCryptoBlock *block,
>  
>      /* Write out the master key material, starting at the
>       * sector immediately following the partition header. */
> -    if (writefunc(block,
> +    if (writefunc(block, opaque,
>                    luks->header.key_slots[0].key_offset *
>                    QCRYPTO_BLOCK_LUKS_SECTOR_SIZE,
>                    splitkey, splitkeylen,
> -                  errp,
> -                  opaque) != splitkeylen) {
> +                  errp) != splitkeylen) {
>          goto error;
>      }
>  
> diff --git a/include/crypto/block.h b/include/crypto/block.h
> index b6971de..4a053a3 100644
> --- a/include/crypto/block.h
> +++ b/include/crypto/block.h
> @@ -30,23 +30,23 @@ typedef struct QCryptoBlock QCryptoBlock;
>   * and QCryptoBlockOpenOptions in qapi/crypto.json */
>  
>  typedef ssize_t (*QCryptoBlockReadFunc)(QCryptoBlock *block,
> +                                        void *opaque,
>                                          size_t offset,
>                                          uint8_t *buf,
>                                          size_t buflen,
> -                                        Error **errp,
> -                                        void *opaque);
> +                                        Error **errp);
>  
>  typedef ssize_t (*QCryptoBlockInitFunc)(QCryptoBlock *block,
> +                                        void *opaque,
>                                          size_t headerlen,
> -                                        Error **errp,
> -                                        void *opaque);
> +                                        Error **errp);
>  
>  typedef ssize_t (*QCryptoBlockWriteFunc)(QCryptoBlock *block,
> +                                         void *opaque,
>                                           size_t offset,
>                                           const uint8_t *buf,
>                                           size_t buflen,
> -                                         Error **errp,
> -                                         void *opaque);
> +                                         Error **errp);
>  
>  /**
>   * qcrypto_block_has_format:
> diff --git a/tests/test-crypto-block.c b/tests/test-crypto-block.c
> index 1957a86..85e6603 100644
> --- a/tests/test-crypto-block.c
> +++ b/tests/test-crypto-block.c
> @@ -187,11 +187,11 @@ static struct QCryptoBlockTestData {
>  
>  
>  static ssize_t test_block_read_func(QCryptoBlock *block,
> +                                    void *opaque,
>                                      size_t offset,
>                                      uint8_t *buf,
>                                      size_t buflen,
> -                                    Error **errp,
> -                                    void *opaque)
> +                                    Error **errp)
>  {
>      Buffer *header = opaque;
>  
> @@ -204,9 +204,9 @@ static ssize_t test_block_read_func(QCryptoBlock *block,
>  
>  
>  static ssize_t test_block_init_func(QCryptoBlock *block,
> +                                    void *opaque,
>                                      size_t headerlen,
> -                                    Error **errp,
> -                                    void *opaque)
> +                                    Error **errp)
>  {
>      Buffer *header = opaque;
>  
> @@ -219,11 +219,11 @@ static ssize_t test_block_init_func(QCryptoBlock *block,
>  
>  
>  static ssize_t test_block_write_func(QCryptoBlock *block,
> +                                     void *opaque,
>                                       size_t offset,
>                                       const uint8_t *buf,
>                                       size_t buflen,
> -                                     Error **errp,
> -                                     void *opaque)
> +                                     Error **errp)
>  {
>      Buffer *header = opaque;
>  
> -- 
> 2.9.3
> 
> 

Regards,
Daniel
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