qcow2: Remove request from in-flight list after error

If we complete a request with a failure we need to remove it from the list of
requests that are in flight. If we don't do it, the next time the same AIOCB is
used for a cluster allocation it will create a loop in the list and qemu will
hang in an endless loop.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

block/qcow2-cluster.c

@@ -811,6 +811,7 @@ int qcow2_alloc_cluster_offset(BlockDriverState *bs, uint64_t offset,
 
     cluster_offset = qcow2_alloc_clusters(bs, nb_clusters * s->cluster_size);
     if (cluster_offset < 0) {
+        QLIST_REMOVE(m, next_in_flight);
         return cluster_offset;
     }
 

block/qcow2.c

@@ -625,11 +625,15 @@ static void qcow_aio_write_cb(void *opaque, int ret)
                                     qcow_aio_write_cb, acb);
     if (acb->hd_aiocb == NULL) {
         ret = -EIO;
-        goto done;
+        goto fail;
     }
 
     return;
 
+fail:
+    if (acb->l2meta.nb_clusters != 0) {
+        QLIST_REMOVE(&acb->l2meta, next_in_flight);
+    }
 done:
     if (acb->qiov->niov > 1)
         qemu_vfree(acb->orig_buf);