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[Qemu-block] [PULL 13/14] block: Document that x-blockdev-change breaks

From: Kevin Wolf
Subject: [Qemu-block] [PULL 13/14] block: Document that x-blockdev-change breaks quorum children list
Date: Wed, 20 Dec 2017 14:19:38 +0100

Removing a quorum child node with x-blockdev-change results in a quorum
driver state that cannot be recreated with create options because it
would require a list with gaps. This causes trouble in at least

Document this problem so that we won't accidentally mark the command
stable without having addressed it.

Signed-off-by: Kevin Wolf <address@hidden>
Reviewed-by: Alberto Garcia <address@hidden>
 qapi/block-core.json | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/qapi/block-core.json b/qapi/block-core.json
index dd763dcf87..4cc1389834 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -3918,6 +3918,10 @@
 # does not support all kinds of operations, all kinds of children, nor
 # all block drivers.
+# FIXME Removing children from a quorum node means introducing gaps in the
+# child indices. This cannot be represented in the 'children' list of
+# BlockdevOptionsQuorum, as returned by .bdrv_refresh_filename().
 # Warning: The data in a new quorum child MUST be consistent with that of
 # the rest of the array.

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