crypto: Introduce 'detached-header' field in QCryptoBlockInfoLUKS

When querying the LUKS disk with the qemu-img tool or other APIs,
add information about whether the LUKS header is detached.

Additionally, update the test case with the appropriate
modification.

Signed-off-by: Hyman Huang <yong.huang@smartx.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

crypto/block-luks.c

@@ -1271,6 +1271,7 @@ qcrypto_block_luks_open(QCryptoBlock *block,
     block->sector_size = QCRYPTO_BLOCK_LUKS_SECTOR_SIZE;
     block->payload_offset = luks->header.payload_offset_sector *
         block->sector_size;
+    block->detached_header = (block->payload_offset == 0) ? true : false;
 
     return 0;
 
@@ -1895,6 +1896,7 @@ static int qcrypto_block_luks_get_info(QCryptoBlock *block,
     info->u.luks.master_key_iters = luks->header.master_key_iterations;
     info->u.luks.uuid = g_strndup((const char *)luks->header.uuid,
                                   sizeof(luks->header.uuid));
+    info->u.luks.detached_header = block->detached_header;
 
     for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) {
         slot = g_new0(QCryptoBlockInfoLUKSSlot, 1);

qapi/crypto.json

@@ -317,6 +317,8 @@
 #
 # @hash-alg: the master key hash algorithm
 #
+# @detached-header: whether the LUKS header is detached (Since 9.0)
+#
 # @payload-offset: offset to the payload data in bytes
 #
 # @master-key-iters: number of PBKDF2 iterations for key material
@@ -333,6 +335,7 @@
            'ivgen-alg': 'QCryptoIVGenAlgorithm',
            '*ivgen-hash-alg': 'QCryptoHashAlgorithm',
            'hash-alg': 'QCryptoHashAlgorithm',
+           'detached-header': 'bool',
            'payload-offset': 'int',
            'master-key-iters': 'int',
            'uuid': 'str',

tests/qemu-iotests/210.out

@@ -18,6 +18,7 @@ virtual size: 128 MiB (134217728 bytes)
 encrypted: yes
 Format specific information:
     ivgen alg: plain64
+    detached header: false
     hash alg: sha256
     cipher alg: aes-256
     uuid: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
@@ -70,6 +71,7 @@ virtual size: 64 MiB (67108864 bytes)
 encrypted: yes
 Format specific information:
     ivgen alg: plain64
+    detached header: false
     hash alg: sha1
     cipher alg: aes-128
     uuid: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
@@ -125,6 +127,7 @@ virtual size: 0 B (0 bytes)
 encrypted: yes
 Format specific information:
     ivgen alg: plain64
+    detached header: false
     hash alg: sha256
     cipher alg: aes-256
     uuid: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
@@ -195,6 +198,7 @@ virtual size: 0 B (0 bytes)
 encrypted: yes
 Format specific information:
     ivgen alg: plain64
+    detached header: false
     hash alg: sha256
     cipher alg: aes-256
     uuid: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX