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-rw-r--r--block/qcow2.c2
-rw-r--r--block/vvfat.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/block/qcow2.c b/block/qcow2.c
index 8fc8f8cc37..8c220ecdc5 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -998,7 +998,7 @@ exit:
if (prealloc) {
BlockDriverState *bs;
bs = bdrv_new("");
- bdrv_open(bs, filename, BDRV_O_CACHE_WB);
+ bdrv_open(bs, filename, BDRV_O_CACHE_WB | BDRV_O_RDWR);
preallocate(bs);
bdrv_close(bs);
}
diff --git a/block/vvfat.c b/block/vvfat.c
index df957e5ff8..d2787b9e76 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -2792,7 +2792,7 @@ static int enable_write_target(BDRVVVFATState *s)
if (bdrv_create(bdrv_qcow, s->qcow_filename, options) < 0)
return -1;
s->qcow = bdrv_new("");
- if (s->qcow == NULL || bdrv_open(s->qcow, s->qcow_filename, 0) < 0)
+ if (s->qcow == NULL || bdrv_open(s->qcow, s->qcow_filename, BDRV_O_RDWR) < 0)
return -1;
#ifndef _WIN32