1 files changed, 20 insertions, 8 deletions

diff --git a/block-qcow.c b/block-qcow.c
index 1fabc49..2decd13 100644
--- a/block-qcow.c
+++ b/block-qcow.c
@@ -530,6 +530,8 @@ typedef struct QCowAIOCB {
     int n;
     uint64_t cluster_offset;
     uint8_t *cluster_data;
+    struct iovec hd_iov;
+    QEMUIOVector hd_qiov;
     BlockDriverAIOCB *hd_aiocb;
 } QCowAIOCB;
 
@@ -584,8 +586,11 @@ static void qcow_aio_read_cb(void *opaque, int ret)
     if (!acb->cluster_offset) {
         if (bs->backing_hd) {
             /* read from the base image */
-            acb->hd_aiocb = bdrv_aio_read(bs->backing_hd,
-                acb->sector_num, acb->buf, acb->n, qcow_aio_read_cb, acb);
+            acb->hd_iov.iov_base = acb->buf;
+            acb->hd_iov.iov_len = acb->n * 512;
+            qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
+            acb->hd_aiocb = bdrv_aio_readv(bs->backing_hd, acb->sector_num,
+                &acb->hd_qiov, acb->n, qcow_aio_read_cb, acb);
             if (acb->hd_aiocb == NULL)
                 goto fail;
         } else {
@@ -605,9 +610,12 @@ static void qcow_aio_read_cb(void *opaque, int ret)
             ret = -EIO;
             goto fail;
         }
-        acb->hd_aiocb = bdrv_aio_read(s->hd,
+        acb->hd_iov.iov_base = acb->buf;
+        acb->hd_iov.iov_len = acb->n * 512;
+        qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
+        acb->hd_aiocb = bdrv_aio_readv(s->hd,
                             (acb->cluster_offset >> 9) + index_in_cluster,
-                            acb->buf, acb->n, qcow_aio_read_cb, acb);
+                            &acb->hd_qiov, acb->n, qcow_aio_read_cb, acb);
         if (acb->hd_aiocb == NULL)
             goto fail;
     }
@@ -687,10 +695,14 @@ static void qcow_aio_write_cb(void *opaque, int ret)
     } else {
         src_buf = acb->buf;
     }
-    acb->hd_aiocb = bdrv_aio_write(s->hd,
-                                   (cluster_offset >> 9) + index_in_cluster,
-                                   src_buf, acb->n,
-                                   qcow_aio_write_cb, acb);
+
+    acb->hd_iov.iov_base = (void *)src_buf;
+    acb->hd_iov.iov_len = acb->n * 512;
+    qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
+    acb->hd_aiocb = bdrv_aio_writev(s->hd,
+                                    (cluster_offset >> 9) + index_in_cluster,
+                                    &acb->hd_qiov, acb->n,
+                                    qcow_aio_write_cb, acb);
     if (acb->hd_aiocb == NULL)
         goto fail;
 }