[PATCH for-5.0 v2 03/23] block: Drop bdrv_is_first_non_filter()

[Max Reitz <mreitz@redhat.com>]

It is unused now.  (And it was ugly because it needed to explore all BDS
chains from the top.)

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 block.c               | 26 --------------------------
 include/block/block.h |  1 -
 2 files changed, 27 deletions(-)

diff --git a/block.c b/block.c
index ae279ff21f..9b1049786a 100644
--- a/block.c
+++ b/block.c
@@ -6205,32 +6205,6 @@ bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs,
     return false;
 }
 
-/* This function checks if the candidate is the first non filter bs down it's
- * bs chain. Since we don't have pointers to parents it explore all bs chains
- * from the top. Some filters can choose not to pass down the recursion.
- */
-bool bdrv_is_first_non_filter(BlockDriverState *candidate)
-{
-    BlockDriverState *bs;
-    BdrvNextIterator it;
-
-    /* walk down the bs forest recursively */
-    for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
-        bool perm;
-
-        /* try to recurse in this top level bs */
-        perm = bdrv_recurse_is_first_non_filter(bs, candidate);
-
-        /* candidate is the first non filter */
-        if (perm) {
-            bdrv_next_cleanup(&it);
-            return true;
-        }
-    }
-
-    return false;
-}
-
 BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs,
                                         const char *node_name, Error **errp)
 {
diff --git a/include/block/block.h b/include/block/block.h
index e9dcfef7fa..8f6a0cad9c 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -404,7 +404,6 @@ int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts,
 /* external snapshots */
 bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs,
                                       BlockDriverState *candidate);
-bool bdrv_is_first_non_filter(BlockDriverState *candidate);
 
 /* check if a named node can be replaced when doing drive-mirror */
 BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs,
-- 
2.23.0