1 files changed, 7 insertions, 1 deletions
diff --git a/block/crypto.c b/block/crypto.c
index c561cbad7a..33f690f6d8 100644
--- a/block/crypto.c
+++ b/block/crypto.c
@@ -361,12 +361,18 @@ static int block_crypto_create_generic(QCryptoBlockFormat format,
 }
 
 static int block_crypto_truncate(BlockDriverState *bs, int64_t offset,
-                                 Error **errp)
+                                 PreallocMode prealloc, Error **errp)
 {
     BlockCrypto *crypto = bs->opaque;
     size_t payload_offset =
         qcrypto_block_get_payload_offset(crypto->block);
 
+    if (prealloc != PREALLOC_MODE_OFF) {
+        error_setg(errp, "Unsupported preallocation mode '%s'",
+                   PreallocMode_lookup[prealloc]);
+        return -ENOTSUP;
+    }
+
     offset += payload_offset;
 
     return bdrv_truncate(bs->file, offset, errp);