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authorMax Reitz <mreitz@redhat.com>2018-02-24 16:40:33 +0100
committerEric Blake <eblake@redhat.com>2018-03-19 14:58:36 -0500
commit4f7be2806e672fa232e406ac5eec26789b9d5f85 (patch)
treeae82d86210521ff3a214b1b6102ef5c43d72e954 /block.c
parente59a0cf17b1b9932b65e6fc25d6856976f5e4831 (diff)
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block: Deprecate "backing": ""
We have a clear replacement, so let's deprecate it. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Alberto Garcia <berto@igalia.com> Message-Id: <20180224154033.29559-8-mreitz@redhat.com> Signed-off-by: Eric Blake <eblake@redhat.com>
Diffstat (limited to 'block.c')
-rw-r--r--block.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/block.c b/block.c
index ab77ba0..a2caadf 100644
--- a/block.c
+++ b/block.c
@@ -2649,6 +2649,10 @@ static BlockDriverState *bdrv_open_inherit(const char *filename,
if (qobject_to(QNull, qdict_get(options, "backing")) != NULL ||
(backing && *backing == '\0'))
{
+ if (backing) {
+ warn_report("Use of \"backing\": \"\" is deprecated; "
+ "use \"backing\": null instead");
+ }
flags |= BDRV_O_NO_BACKING;
qdict_del(options, "backing");
}