[Qemu-devel] [PATCH] qcow2: Remove wrong metadata overlap check

[Max Reitz <mreitz@redhat.com>]

In qcow2_write_compressed, if the compression fails, a normal cluster is
written to disk. This is done through bdrv_write on the qcow2 BDS
itself (using the guest offset), thus it is wrong to do a metadata
overlap check before.

Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 block/qcow2.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/block/qcow2.c b/block/qcow2.c
index d59ecbd..dc0b60e 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1738,14 +1738,6 @@ static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num,
 
     if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
         /* could not compress: write normal cluster */
-
-        ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT,
-                sector_num * BDRV_SECTOR_SIZE,
-                s->cluster_sectors * BDRV_SECTOR_SIZE);
-        if (ret < 0) {
-            goto fail;
-        }
-
         ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors);
         if (ret < 0) {
             goto fail;
-- 
1.8.3.1