block: Add reopen_queue to bdrv_child_perm()

In the context of bdrv_reopen(), we'll have to look at the state of the
graph as it will be after the reopen. This interface addition is in
preparation for the change.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/block/block_int.h b/include/block/block_int.h
index ba4c383393..99abe2ce74 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -411,9 +411,14 @@ struct BlockDriver {
      *
      * If @c is NULL, return the permissions for attaching a new child for the
      * given @role.
+     *
+     * If @reopen_queue is non-NULL, don't return the currently needed
+     * permissions, but those that will be needed after applying the
+     * @reopen_queue.
      */
      void (*bdrv_child_perm)(BlockDriverState *bs, BdrvChild *c,
                              const BdrvChildRole *role,
+                             BlockReopenQueue *reopen_queue,
                              uint64_t parent_perm, uint64_t parent_shared,
                              uint64_t *nperm, uint64_t *nshared);
 
@@ -983,6 +988,7 @@ int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared,
  * all children */
 void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c,
                                const BdrvChildRole *role,
+                               BlockReopenQueue *reopen_queue,
                                uint64_t perm, uint64_t shared,
                                uint64_t *nperm, uint64_t *nshared);
 
@@ -992,6 +998,7 @@ void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c,
  * CONSISTENT_READ and doesn't share WRITE. */
 void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c,
                                const BdrvChildRole *role,
+                               BlockReopenQueue *reopen_queue,
                                uint64_t perm, uint64_t shared,
                                uint64_t *nperm, uint64_t *nshared);