crypto: Make errp the last parameter of functions

Move opaque to 2nd instead of the 2nd to last, so that compilers help
check with the conversion.

Signed-off-by: Fam Zheng <famz@redhat.com>
Message-Id: <20170421122710.15373-7-famz@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[Commit message typo corrected]
Signed-off-by: Markus Armbruster <armbru@redhat.com>

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;

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;
     }
 

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:

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;