[PATCH v2 3/4] qcow2: Tighten cluster_offset alignment assertions

[Alberto Garcia <berto@igalia.com>]

qcow2_alloc_cluster_offset() and qcow2_get_cluster_offset() always
return offsets that are cluster-aligned so don't just check that they
are sector-aligned.

The check in qcow2_co_preadv_task() is also replaced by an assertion
for the same reason.

Signed-off-by: Alberto Garcia <berto@igalia.com>
---
 block/qcow2.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/block/qcow2.c b/block/qcow2.c
index 848a6c5182..783d2b9578 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -2175,10 +2175,7 @@ static coroutine_fn int qcow2_co_preadv_task(BlockDriverState *bs,
                                           offset, bytes, qiov, qiov_offset);
 
     case QCOW2_CLUSTER_NORMAL:
-        if ((file_cluster_offset & 511) != 0) {
-            return -EIO;
-        }
-
+        assert(QEMU_IS_ALIGNED(file_cluster_offset, s->cluster_size));
         if (bs->encrypted) {
             return qcow2_co_preadv_encrypted(bs, file_cluster_offset,
                                              offset, bytes, qiov, qiov_offset);
@@ -2514,7 +2511,7 @@ static coroutine_fn int qcow2_co_pwritev_part(
             goto out_locked;
         }
 
-        assert((cluster_offset & 511) == 0);
+        assert(QEMU_IS_ALIGNED(cluster_offset, s->cluster_size));
 
         ret = qcow2_pre_write_overlap_check(bs, 0,
                                             cluster_offset + offset_in_cluster,
@@ -3904,7 +3901,7 @@ qcow2_co_copy_range_to(BlockDriverState *bs,
             goto fail;
         }
 
-        assert((cluster_offset & 511) == 0);
+        assert(QEMU_IS_ALIGNED(cluster_offset, s->cluster_size));
 
         ret = qcow2_pre_write_overlap_check(bs, 0,
                 cluster_offset + offset_in_cluster, cur_bytes, true);
-- 
2.20.1