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[PATCH 14/22] quorum: Stop marking it as a filter
From: |
Max Reitz |
Subject: |
[PATCH 14/22] quorum: Stop marking it as a filter |
Date: |
Fri, 20 Sep 2019 17:27:56 +0200 |
Quorum is not a filter, for example because it cannot guarantee which of
its children will serve the next request. Thus, any of its children may
differ from the data visible to quorum's parents.
We have other filters with multiple children, but they differ in this
aspect:
- blkverify quits the whole qemu process if its children differ. As
such, we can always skip it when we want to skip it (as a filter node)
by going to any of its children. Both have the same data.
- replication generally serves requests from bs->file, so this is its
only actually filtered child.
- Block job filters currently only have one child, but they will
probably get more children in the future. Still, they will always
have only one actually filtered child.
Having "filters" as a dedicated node category only makes sense if you
can skip them by going to a one fixed child that always shows the same
data as the filter node. Quorum cannot fulfill this, so it is not a
filter.
Signed-off-by: Max Reitz <address@hidden>
---
block/quorum.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/block/quorum.c b/block/quorum.c
index 7a8f8b5475..7f56b4df7c 100644
--- a/block/quorum.c
+++ b/block/quorum.c
@@ -1237,7 +1237,6 @@ static BlockDriver bdrv_quorum = {
.bdrv_child_perm = quorum_child_perm,
- .is_filter = true,
.bdrv_recurse_can_replace = quorum_recurse_can_replace,
.strong_runtime_opts = quorum_strong_runtime_opts,
--
2.21.0
- [PATCH 17/22] iotests: Add VM.assert_block_path(), (continued)
- [PATCH 17/22] iotests: Add VM.assert_block_path(), Max Reitz, 2019/09/20
- [PATCH 10/22] quorum: Implement .bdrv_recurse_can_replace(), Max Reitz, 2019/09/20
- [PATCH 12/22] block: Remove bdrv_recurse_is_first_non_filter(), Max Reitz, 2019/09/20
- [PATCH 14/22] quorum: Stop marking it as a filter,
Max Reitz <=
- [PATCH 15/22] mirror: Prevent loops, Max Reitz, 2019/09/20
- [PATCH 16/22] iotests: Use complete_and_wait() in 155, Max Reitz, 2019/09/20
- [PATCH 18/22] iotests: Resolve TODOs in 041, Max Reitz, 2019/09/20
- [PATCH 19/22] iotests: Use self.image_len in TestRepairQuorum, Max Reitz, 2019/09/20
- [PATCH 21/22] iotests: Check that @replaces can replace filters, Max Reitz, 2019/09/20