diff --git a/block/crypto.c b/block/crypto.c
index 87b1e005bf..64bf095608 100644
--- a/block/crypto.c
+++ b/block/crypto.c
@@ -507,7 +507,7 @@ block_crypto_co_writev(BlockDriverState *bs, int64_t sector_num,
         qemu_iovec_reset(&hd_qiov);
         qemu_iovec_add(&hd_qiov, cipher_data, cur_nr_sectors * 512);
 
-        ret = bdrv_co_writev(bs->file->bs,
+        ret = bdrv_co_writev(bs->file,
                              payload_offset + sector_num,
                              cur_nr_sectors, &hd_qiov);
         if (ret < 0) {
diff --git a/block/io.c b/block/io.c
index c988e1b925..17e4ad47ec 100644
--- a/block/io.c
+++ b/block/io.c
@@ -1547,12 +1547,12 @@ static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs,
                            nb_sectors << BDRV_SECTOR_BITS, qiov, flags);
 }
 
-int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
+int coroutine_fn bdrv_co_writev(BdrvChild *child, int64_t sector_num,
     int nb_sectors, QEMUIOVector *qiov)
 {
-    trace_bdrv_co_writev(bs, sector_num, nb_sectors);
+    trace_bdrv_co_writev(child->bs, sector_num, nb_sectors);
 
-    return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0);
+    return bdrv_co_do_writev(child->bs, sector_num, nb_sectors, qiov, 0);
 }
 
 int coroutine_fn bdrv_co_pwrite_zeroes(BlockDriverState *bs,
diff --git a/block/parallels.c b/block/parallels.c
index 7da01fb87d..91ab61ff2f 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -311,7 +311,7 @@ static coroutine_fn int parallels_co_writev(BlockDriverState *bs,
         qemu_iovec_reset(&hd_qiov);
         qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
 
-        ret = bdrv_co_writev(bs->file->bs, position, n, &hd_qiov);
+        ret = bdrv_co_writev(bs->file, position, n, &hd_qiov);
         if (ret < 0) {
             break;
         }
diff --git a/block/qcow.c b/block/qcow.c
index c8d4e5fdb6..0db43f899d 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -745,7 +745,7 @@ static coroutine_fn int qcow_co_writev(BlockDriverState *bs, int64_t sector_num,
         hd_iov.iov_len = n * 512;
         qemu_iovec_init_external(&hd_qiov, &hd_iov, 1);
         qemu_co_mutex_unlock(&s->lock);
-        ret = bdrv_co_writev(bs->file->bs,
+        ret = bdrv_co_writev(bs->file,
                              (cluster_offset >> 9) + index_in_cluster,
                              n, &hd_qiov);
         qemu_co_mutex_lock(&s->lock);
diff --git a/block/vhdx.c b/block/vhdx.c
index cca2540564..b0f66deb9d 100644
--- a/block/vhdx.c
+++ b/block/vhdx.c
@@ -1326,7 +1326,7 @@ static coroutine_fn int vhdx_co_writev(BlockDriverState *bs, int64_t sector_num,
                 }
                 /* block exists, so we can just overwrite it */
                 qemu_co_mutex_unlock(&s->lock);
-                ret = bdrv_co_writev(bs->file->bs,
+                ret = bdrv_co_writev(bs->file,
                                     sinfo.file_offset >> BDRV_SECTOR_BITS,
                                     sectors_to_write, &hd_qiov);
                 qemu_co_mutex_lock(&s->lock);
diff --git a/include/block/block.h b/include/block/block.h
index 16ec088b7a..70b1b80ca9 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -243,8 +243,8 @@ int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
     const void *buf, int count);
 int coroutine_fn bdrv_co_readv(BdrvChild *child, int64_t sector_num,
                                int nb_sectors, QEMUIOVector *qiov);
-int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
-    int nb_sectors, QEMUIOVector *qiov);
+int coroutine_fn bdrv_co_writev(BdrvChild *child, int64_t sector_num,
+                               int nb_sectors, QEMUIOVector *qiov);
 /*
  * Efficiently zero a region of the disk image.  Note that this is a regular
  * I/O request like read or write and should have a reasonable size.  This