[PATCH 03/22] block: Drop bdrv_is_first_non_filter()

From: Max Reitz <mreitz@redhat.com>
To: qemu-block@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>, Alberto Garcia <berto@igalia.com>,
	qemu-devel@nongnu.org, Max Reitz <mreitz@redhat.com>
Subject: [PATCH 03/22] block: Drop bdrv_is_first_non_filter()
Date: Fri, 20 Sep 2019 17:27:45 +0200	[thread overview]
Message-ID: <20190920152804.12875-4-mreitz@redhat.com> (raw)
In-Reply-To: <20190920152804.12875-1-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>
---
 include/block/block.h |  1 -
 block.c               | 26 --------------------------
 2 files changed, 27 deletions(-)

diff --git a/include/block/block.h b/include/block/block.h
index 37c9de7446..d3ccab4722 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -403,7 +403,6 @@ 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,
diff --git a/block.c b/block.c
index 1c7c199849..7d99ca692c 100644
--- a/block.c
+++ b/block.c
@@ -6206,32 +6206,6 @@ 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)
 {
-- 
2.21.0


