Overriding flags violates the precedence rules of bdrv_reopen_queue_child. Just like the read-only option, no-flush should be put into the options. The same is done in bdrv_temp_snapshot_options.
Reported-by: Stefan Hajnoczi <[email protected] Signed-off-by: Fam Zheng <[email protected]> --- block/vvfat.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/vvfat.c b/block/vvfat.c index 4a17a49e12..1569783b0f 100644 --- a/block/vvfat.c +++ b/block/vvfat.c @@ -3129,7 +3129,7 @@ static void vvfat_qcow_options(int *child_flags, QDict *child_options, int parent_flags, QDict *parent_options) { qdict_set_default_str(child_options, BDRV_OPT_READ_ONLY, "off"); - *child_flags = BDRV_O_NO_FLUSH; + qdict_set_default_str(child_options, BDRV_OPT_CACHE_NO_FLUSH, "on"); } static const BdrvChildRole child_vvfat_qcow = { -- 2.14.3
