vvfat: Implement .bdrv_child_perm()

vvfat is the last remaining driver that can have children, but doesn't
implement .bdrv_child_perm() yet. The default handlers aren't suitable
here, so let's implement a very simple driver-specific one that protects
the internal child from being used by other users as good as our
permissions permit.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Fam Zheng <famz@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/block.c b/block.c
index d67819f2a2..281ce7bec3 100644
--- a/block.c
+++ b/block.c
@@ -823,7 +823,7 @@ static void bdrv_backing_options(int *child_flags, QDict *child_options,
     *child_flags = flags;
 }
 
-static const BdrvChildRole child_backing = {
+const BdrvChildRole child_backing = {
     .inherit_options = bdrv_backing_options,
     .drained_begin   = bdrv_child_cb_drained_begin,
     .drained_end     = bdrv_child_cb_drained_end,