This is useful in other files like blockdev.c to determine for example
whether a node can be written to or not.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 include/block/block_int.h | 3 +++
 block.c                   | 6 ++----
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/include/block/block_int.h b/include/block/block_int.h
index 786801c32f..c17df3808a 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -1205,6 +1205,9 @@ int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared,
  */
 int bdrv_child_refresh_perms(BlockDriverState *bs, BdrvChild *c, Error **errp);
 
+void bdrv_get_cumulative_perm(BlockDriverState *bs,
+                              uint64_t *perm, uint64_t *shared_perm);
+
 /* Default implementation for BlockDriver.bdrv_child_perm() that can be used by
  * block filters: Forward CONSISTENT_READ, WRITE, WRITE_UNCHANGED and RESIZE to
  * all children */
diff --git a/block.c b/block.c
index 6e1ddab056..915b80153c 100644
--- a/block.c
+++ b/block.c
@@ -1713,8 +1713,6 @@ static int bdrv_child_check_perm(BdrvChild *c, BlockReopenQueue *q,
                                  bool *tighten_restrictions, Error **errp);
 static void bdrv_child_abort_perm_update(BdrvChild *c);
 static void bdrv_child_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared);
-static void bdrv_get_cumulative_perm(BlockDriverState *bs, uint64_t *perm,
-                                     uint64_t *shared_perm);
 
 typedef struct BlockReopenQueueEntry {
      bool prepared;
@@ -1938,8 +1936,8 @@ static void bdrv_set_perm(BlockDriverState *bs, uint64_t cumulative_perms,
     }
 }
 
-static void bdrv_get_cumulative_perm(BlockDriverState *bs, uint64_t *perm,
-                                     uint64_t *shared_perm)
+void bdrv_get_cumulative_perm(BlockDriverState *bs,
+                              uint64_t *perm, uint64_t *shared_perm)
 {
     BdrvChild *c;
     uint64_t cumulative_perms = 0;
-- 
2.21.0